CN112942017B - Football field anchoring type mixed lawn and construction method thereof - Google Patents

Abstract

The invention relates to an anchored mixed lawn for a football field and a construction method thereof, which comprises a field, a sprinkling irrigation pipe ditch sand cushion, a sprinkling irrigation water pipe, backfill sand, backfill soil, geotextile, crushed stone at the bottom of a drainage pipe ditch, a drainage pipe, backfill crushed stone, a lower crushed stone drainage layer, an upper crushed stone drainage layer, a lower yellow sand layer and an upper yellow sand layer mixed with organic matters, wherein the field, the sprinkling irrigation pipe ditch sand cushion, the sprinkling irrigation water pipe, the backfill sand, the backfill soil, the geotextile, the crushed stone at the bottom of the drainage pipe ditch, the drainage pipe, the backfill crushed stone, the lower crushed stone drainage layer, the upper crushed stone drainage layer and the lower yellow sand layer are sequentially arranged; cutting off the anchoring grass fibers on the upper yellow sand layer, implanting the cut anchoring grass fibers into the upper yellow sand layer by using steel nails, pulling out the steel nails, remaining the anchoring grass fibers in the upper yellow sand layer to form a piece of anchoring grass, and finally planting real grass around the anchoring grass; the invention has simple structure and ingenious design; the device can meet the requirement of the international football match, is slightly influenced by weather, is trampling-resistant and has low maintenance cost.

Description

Football field anchoring type mixed lawn and construction method thereof

Technical Field

The invention belongs to the technical field of constructional engineering, and particularly relates to an anchored mixed lawn for a football field and a construction method thereof.

Background

With the increasing international status of China, more and more international football events are held in China. International events have high requirements on the lawn forming quality of the football field, and require that the surface hardness, the traction force coefficient, the ball rebound rate, the ball rolling distance, the field gradient, the flatness, the stem density, the grass surface uniformity and the water seepage rate of a root system layer and a water seepage layer of the lawn surface layer reach the optimal values. Meanwhile, the ground surface of the football field is required to be free from dust, water accumulation and mud, completely flat and smooth, tough and elastic turf, trampling resistance and long greenness. Traditional football court lawn has soft, to the better advantage of sportsman's protectiveness, nevertheless receives weather effect great, easy ponding, mire, and because suffer to trample for a long time, the roughness is relatively poor, needs to spend a large amount of manpower and materials to maintain. The artificial lawn developed along with the artificial lawn has the advantages of small influence by weather, high field utilization rate, durability, low maintenance cost and the like, but the sports performance can not reach the standard of international events, thereby influencing the performance of athletes on the spot.

In view of the above problems, there is a need for improvements in the prior art.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides the football field lawn which meets the requirements of international events, is less influenced by weather, is resistant to trampling and has low maintenance cost and the construction method thereof.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: an anchoring type mixed lawn for a football field comprises a field, a sprinkling irrigation pipe ditch sand cushion, a sprinkling irrigation water pipe, backfill sand, backfill soil, geotextile, broken stone at the bottom of a drainage pipe ditch, a drainage pipe, backfill broken stone, a lower broken stone drainage layer, an upper broken stone drainage layer, a lower yellow sand layer and an upper yellow sand layer mixed with organic matters, which are sequentially arranged; firstly cutting off the anchoring grass fibers on the upper yellow sand layer, then implanting the cut anchoring grass fibers into the upper yellow sand layer by using steel nails, pulling out the steel nails, remaining the anchoring grass fibers in the upper yellow sand layer to form a piece of anchoring grass, and finally planting real grass around the anchoring grass.

A construction method of an anchored mixed lawn in a football field comprises the following steps:

step one, compacting and paying off a field; the field is roughly leveled, and a bucket forklift is adopted for primarily leveling the field, so that the field is not too large in depression, and the fine leveling work speed is accelerated; the fine leveling work controls the elevation block by block according to a square grid put in advance, and the leveling instrument tracks and measures; the flatness and the gradient are controlled according to the requirements of a drawing design finished surface; after leveling, a vibration road roller is selected for rolling;

step two, laying a sprinkling irrigation system; excavating a pipe trench according to the sprinkling irrigation system diagram; the sprinkling irrigation system diagram needs to consider that a sufficient number of spray heads are arranged in the whole football field; the infield spray heads are 360-degree full-circumference spray heads, the spray heads at the side lines and the end lines are adjustable semicircular spray heads, and the spray heads at the four corners are adjustable 90-degree spray heads; the sprinkling irrigation system can normally sprinkle all court needing sprinkling irrigation within any 24 hours; the system has the capability of rapidly sprinkling water to the whole court within 15 minutes; after the irrigation water pipe ditch is excavated, laying sand at the bottom of the ditch; the sprinkling irrigation water pipe is connected to a certain distance on the ground surface according to the designed size, then placed into a sprinkling irrigation water pipe ditch, connected by an interface, and connected with a vertical pipe at the position of a spray head; after the pipeline is laid, sand is backfilled in the middle of the pipeline, and the interface part of the pipeline is not backfilled;

step three, pressure testing is carried out on the sprinkling irrigation water pipe; blocking a plug of a nozzle connecting pipe, connecting a squeezer at an outlet of one of the stand pipes, and installing an exhaust valve at an outlet of the stand pipe at the highest point of the pipeline; then starting to press; checking whether all joints of the pipeline are broken or leak water; after the compaction test is successful, covering the pipeline with backfill sand, and then backfilling soil; watering, filling soil, tamping, and backfilling to a plain soil surface layer in layers;

paving geotextile and a drain pipe; digging blind drain ditches (drainage ditches), and then paving a geotextile layer above the plain soil layer, wherein the seam of the geotextile needs to ensure the minimum overlapping width for ensuring the water-proof effect; the drain pipes are arranged in a straight line shape, and the distance between the drain branch pipes is 5 m; the drainage branch pipe is a six-surface perforated double-wall corrugated pipe, and the drainage main pipe is a double-wall corrugated pipe; the inner wall of the pipeline is smooth, and the outer wall of the pipeline is solid; the whole drainage pipe ditch is laid and excavated according to a drawing, the pipe ditch is required to be straight, and the ditch bottom is flat; the section of the drain pipe ditch is trapezoidal, and the gradient of the drain pipe ditch is 3 per mill; paving a layer of broken stone at the bottom of the drainage pipe ditch; then laying a drain pipe according to a design drawing; backfilling the broken stone above the drain pipe;

paving a gravel drainage layer; before the gravel drainage layer is laid, the investigation of a supplier is well done to ensure the grading of the gravel; the gravel drainage layer is divided into an upper layer and a lower layer with different grading, the particle size of the lower layer of gravel is larger, and the particle size of the upper layer of gravel is smaller; after the lower gravel drainage layer is laid, the upper gravel drainage layer is laid; opening up a material transfer yard at one corner close to the court, and paving the broken stones from near to far; paving a broken stone drainage layer by means of a laser land leveler, and paving and compacting simultaneously; after leveling the ground, measuring by using a laser ruler, and controlling the elevation error;

step six, paving a lower yellow sand layer; before the yellow sand layer is laid, the thorough investigation of suppliers is done, and multiple indexes such as good gradation, organic matter content and the like need to be controlled; the yellow sand layer is divided into an upper layer and a lower layer with different grading, the grain diameter of the lower layer of yellow sand is larger, and the grain diameter of the upper layer of yellow sand is smaller; paving the upper layer of yellow sand after the lower layer of yellow sand is completely paved; screening sand again after the yellow sand enters the field to ensure the gradation of the yellow sand; paving after the yellow sand screening is finished, compacting while paving, and leveling by using a laser land leveler; the laser land leveller gradually enlarges the land leveling area in a mode of first small circle and then large circle; after leveling the ground, measuring by using a laser ruler, and controlling the elevation error;

laying an upper yellow sand layer; before the yellow sand layer is laid, the thorough investigation of suppliers is done, and multiple indexes such as good gradation, organic matter content and the like need to be controlled; screening sand again after the yellow sand enters the field to ensure the gradation of the yellow sand; sieving the sand of the upper layer of yellow sand, mixing the sand with organic matters, paving, carrying out rotary tillage by using a tractor during paving, uniformly stirring the organic matters, compacting while paving, and leveling by using a laser grader; the laser land leveller gradually enlarges the land leveling area in a mode of first small circle and then large circle; after leveling the ground, measuring by using a laser ruler, and controlling the elevation error;

and (eighthly), finely leveling the field. Leveling the ground by using the laser grader again, and repeatedly rotating the laser grader to scrape and compact the ground;

step nine, installing an automatic sprinkling irrigation control system; the installation is sprayed the program controller, is connected solenoid valve and control wire, is connected solenoid valve control circuit through spraying the program controller with the water pump control switch board simultaneously, carries out the commissioning debugging. Installing a sprinkler, paying off according to a design drawing, and determining the terminal position of the sprinkler; connecting a universal joint to adjust the height of the spray head, wherein the height of the top surface of the straw hat cup of the spray head is required to be flush with the surface of the lawn;

step (ten), testing water; turning on a control switch, supplying water and flushing a pipeline to ensure that the irrigation system can normally operate and then the lawn can be planted;

and step eleven, implanting anchoring grass. The anchoring grass is implanted by a high-precision special machine; cutting the bundle of the anchoring grass fibers into a section of 40cm by a special machine, pressing the middle part of the cut anchoring grass fibers by a special steel nail, implanting the anchoring grass fibers into a yellow sand layer, wherein the implantation depth is 18cm, and the height left on the ground surface is 2 cm; the anchoring grass fibers are implanted and then pulled out by the special steel nails, and the anchoring grass cannot be taken out due to the special structure of the steel nails; the anchoring grass is arranged in a grid matrix after being implanted; before the construction of the special machinery, a total station is used for dotting in advance, and a wire is pulled; the special machine moves along the pulled line, and anchoring grass in an area about 2 meters wide can be implanted each time;

step twelve, sowing real grass; covering protection and anti-pollution measures are taken for the site before real grass is sown; the temperature for ensuring the growth of grass stems is needed for sowing real grass; when selecting grass seeds, the green period is selected as far as possible, the grass seeds are insensitive to air temperature, are trampling resistant, have strong pest and disease resistance, are suitable for growing in sandy soil with good drainage, are not easy to scratch the skin of people, and have elasticity, foot feeling and football friction coefficient which can meet the requirements of international events.

As a preferred mode of the invention, the elevation is controlled by relying on a 5-meter square grid in the fine leveling work in the step (I).

As a preferred mode of the invention, in the step (two), the sprinkler irrigation system works according to 24 spray heads simultaneously, a main water supply PE pipe DE200 is designed, a left PE pipe DE125 and a right PE pipe DE125 are arranged after entering a football field, electromagnetic valves are respectively arranged on the pipes, and the branch pipes are divided into DE90 and DE63 according to the design; wherein, the sprinkling irrigation water pipe adopts a PE pipe, the nominal pressure resistance is 1.0MPa, and the buried depth is 80 cm; wherein, 5-8cm thick sand pad is paved at the bottom of the pipe trench.

As a preferable mode of the present invention, after the pressurization in the step (three), the experimental pressure is 1.5 times (0.9Mpa) of the working pressure (0.6Mpa) of the nozzle, and the pressure drop within 60 minutes is not more than 0.05Mpa, which is qualified; wherein, after the pressure test is successful, the thickness of the backfilled sand covered pipeline is 5 cm.

In a preferred mode of the invention, in the step (iv), 300g/m2 is selected as the geotextile, and the minimum overlapping width (overlapping width) of the geotextile is 30 cm; the drainage branch pipe is a six-face perforated double-wall corrugated pipe with ring stiffness SN8DN110HDPE, and the drainage main pipe is a double-wall corrugated pipe with ring stiffness SN8DN200 HDPE; the drainage branch pipe ditch is trapezoidal in cross section, the top width is not less than 30cm, the bottom width is not less than 20cm, the depth is not less than 20cm, the drainage main pipe ditch is trapezoidal in cross section, the top width is not less than 40cm, the bottom width is not less than 30cm, the depth is not less than 30cm, 5cm of crushed stone is paved at the bottom of the drainage pipe ditch, and 5cm of crushed stone is backfilled above a drainage pipe.

In a preferable mode of the invention, in the step (v), the thickness of the lower gravel drainage layer is 15 cm; the thickness of the upper layer gravel drainage layer is 5 cm;

in a preferred embodiment of the present invention, in the step (vi), the thickness of the lower layer of yellow sand is 15cm, and the thickness of the upper layer of yellow sand is 15 cm.

As a preferable mode of the invention, the organic matter in the step (seven) is composed of turfy soil, compound fertilizer and water retention agent.

As a preferred mode of the invention, two sets of rain bird controllers are adopted in the step (nine) to control the two electromagnetic valves to work; the 24 rain birds 8005ss football field special nozzles are all provided with matched American imported straw hat cups.

In a preferred embodiment of the present invention, in the step (eleven), each bundle of anchor grass is composed of 6 fibers, the fibers are made of PP, and the distance between the anchor grass is 20mm × 20 mm.

As a preferable mode of the invention, in the step (twelve), the protection and pollution prevention measures are that a layer of 80g/m2 geotextile is covered on the whole field, a green dust screen is covered on the geotextile, and the iron railings around the geotextile are protected on the whole field; wherein, the transportation of real grass stems: when the ambient temperature is 30 ℃, the transportation time exceeds 12 hours, and a cold chain transport vehicle at 10 ℃ is required for transportation; when the ambient temperature is lower than 30 ℃, the straw can be packaged by a packing material with good air permeability, and transported by a rail type carriage, and the straw transportation time is not longer than 72 hours.

The invention has the beneficial effects that: the invention has simple structure and ingenious design; the device can meet the requirements of international football events, is slightly influenced by weather, is trampling-resistant and has low maintenance cost.

Drawings

FIG. 1 is a cross-sectional view of an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an embodiment A-A of the present invention;

FIG. 3 is a partial enlarged view of embodiment B of the present invention;

reference numbers in the figures: the irrigation ditch comprises a field 1, irrigation ditch sand padding 2, an irrigation water pipe 3, backfill sand 4, backfill soil 5, geotextile 6, broken stone 7 at the bottom of a drainage ditch, a drainage pipe 8, backfill broken stone 9, a lower broken stone drainage layer 10, an upper broken stone drainage layer 11, a lower yellow sand layer 12, an upper yellow sand layer 13 mixed with organic matters, a sprayer 14 with a spray head straw cap cup at the top, anchoring grass 15, real grass 16, anchoring grass fibers 17 after being cut off and steel nails 18.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

as shown in fig. 1-3, the anchor type mixed lawn for a football field provided by the embodiment comprises a field 1, a sprinkling irrigation pipe ditch sand cushion 2, a sprinkling irrigation pipe 3, backfill sand 4, backfill soil 5, geotextile 6, crushed stone 7 at the bottom of a drainage pipe ditch, a drainage pipe 8, backfill crushed stone 9, a lower crushed stone drainage layer 10, an upper crushed stone drainage layer 11, a lower yellow sand layer 12 and an upper yellow sand layer 13 mixed with organic matters, which are sequentially arranged; firstly cutting off the anchoring grass fibers on the upper-layer yellow sand layer 13, then implanting the cut anchoring grass fibers 17 into the upper-layer yellow sand layer 13 by using steel nails 18, then pulling out the steel nails 18, leaving the anchoring grass fibers 17 in the upper-layer yellow sand layer 13 to form a sheet of anchoring grass 15, and finally planting real grass 16 around the anchoring grass 15.

A construction method of an anchored mixed lawn in a football field comprises the following steps:

step one, compacting and paying off a field. The field is roughly leveled, and a bucket forklift is adopted to conduct initial leveling of the field, so that the field is not too large in depression, and the fine leveling work speed is accelerated. And (4) controlling the elevation block by the fine leveling work according to a square grid which is put in advance, and tracking and measuring by a level gauge. And the flatness and the gradient are ensured to be controlled according to the requirement of the drawing design finished surface. After leveling, a vibration road roller is selected for rolling; wherein, the elevation is controlled by the fine leveling work depending on a 5m square grid.

And (II) laying a sprinkling irrigation system. And excavating pipe ditches according to the sprinkling irrigation system diagram. Laying sand pads with the thickness of 5-8cm at the bottom of the pipe trench; the sprinkling irrigation system diagram needs to consider that a sufficient number of spray heads are arranged in the whole football field; the infield spray heads are 360-degree full-circumference spray heads, the spray heads at the side lines and the end lines are adjustable semicircular spray heads, and the spray heads at the four corners are adjustable 90-degree spray heads; the sprinkling irrigation system can normally sprinkle all the courts needing sprinkling irrigation within any 24 hours. The system has the ability to rapidly spray water throughout the course in 15 minutes. And after the irrigation water pipe ditch is excavated, paving sand at the bottom of the ditch. The sprinkling irrigation water pipe is connected to a certain distance on the ground surface according to the designed size, then is put into a sprinkling irrigation water pipe ditch, is connected with an interface, and is connected with a vertical pipe at the position of the spray head. After the pipeline is laid, sand is backfilled in the middle of the pipeline, and the joint part of the pipeline is not backfilled.

The sprinkling irrigation system works simultaneously according to 24 spray heads, a main water supply PE pipe DE200 is designed, a left PE pipe DE125 and a right PE pipe DE125 are arranged after entering a football field, electromagnetic valves are respectively arranged on the pipes, and branch pipes are divided into DE90 and DE63 according to the design; the spray irrigation water pipe adopts a PE pipe, the nominal pressure resistance is 1.0MPa, and the buried depth is 80 cm.

And step three, pressure testing is carried out on the sprinkling irrigation water pipe. And (3) plugging a nozzle connecting pipe plug, connecting a pressure machine at the outlet of one of the stand pipes, and installing an exhaust valve at the outlet of the stand pipe at the highest point of the pipeline. Then, the pressing is started. Checking whether all joints of the pipeline are broken or leak water. After the compaction test was successful, the pipeline was covered with backfill sand and then backfilled with soil. Watering, filling soil, tamping, and backfilling to a plain soil surface layer in layers; wherein, after the pressure is increased, the experimental pressure is 1.5 times (0.9Mpa) of the working pressure (0.6Mpa) of the spray head, and the pressure drop within 60 minutes is not more than 0.05Mpa, so the product is qualified; after the pressure test is successful, the thickness of the backfilled sand covered pipeline is 5 cm.

And step four, laying geotextile and a drain pipe. Digging blind drain ditches (drainage ditches), and then paving a geotextile layer above the plain soil layer, wherein the seam of the geotextile needs to ensure the minimum overlapping width for ensuring the water-proof effect; 300g/m2 is selected as the geotextile; the minimum overlapping width (lap joint width) of the geotextile is 30 cm; the drain pipes are arranged in a straight line shape, and the distance between the drain branch pipes is 5 m; six-surface perforated double-wall corrugated pipes are selected as the drainage branch pipes, and double-wall corrugated pipes are selected as the drainage main pipes. The inner wall of the pipeline is smooth, and the outer wall of the pipeline is firm. The whole drainage pipe ditch is dug according to the paying-off of a drawing, the pipe ditch is required to be straight, and the bottom of the ditch is flat. The section of the drainage pipe ditch is trapezoidal, and the gradient of the drainage ditch is 3 per mill. And paving a layer of broken stone at the bottom of the drainage pipe ditch. And then laying a drain pipe according to a design drawing. Backfilling broken stones to be above the drain pipe; 5cm of broken stone is paved at the bottom of the drainage pipe ditch, and 5cm of broken stone is backfilled above the drainage pipe.

The drainage branch pipe is a six-face perforated double-wall corrugated pipe with ring stiffness SN8DN110HDPE, and the drainage main pipe is a double-wall corrugated pipe with ring stiffness SN8DN200 HDPE; the drainage branch pipe ditch is trapezoidal in cross section, the top width is not less than 30cm, the bottom width is not less than 20cm, the depth is not less than 20cm, the drainage main pipe ditch is trapezoidal in cross section, the top width is not less than 40cm, the bottom width is not less than 30cm, and the depth is not less than 30 cm.

And step five, paving a gravel drainage layer. Before the gravel drainage layer is laid, the investigation of suppliers is done to ensure the grading of the gravel. The gravel drainage layer is divided into an upper layer and a lower layer with different grading, the particle size of the lower layer of gravel is larger, and the particle size of the upper layer of gravel is smaller. And after the lower gravel drainage layer is laid, the upper gravel drainage layer is laid. At one corner close to the court, a material transfer yard is opened up, and the broken stones are laid from near to far. And paving a broken stone drainage layer by means of a laser land leveler, and paving and compacting simultaneously. After leveling the ground, measuring by using a laser ruler, and controlling the elevation error; the thickness of the lower gravel drainage layer is 15 cm; the thickness of the upper gravel drainage layer is 5 cm.

Wherein the particle size of the lower layer of crushed stone is as follows:

screen mesh size	Passage Rate (%)
		12.5mm	100
8mm	90-100
		4mm	10-40
2mm	0-2
		1mm	0-1

The particle size of the upper crushed stone is as follows:

screen mesh size	Passage Rate (%)
		8mm	100
4mm	90-100
		2mm	10-85
1mm	0-25
		0.5mm	0-10
0.25mm	0-4
		0.125mm	0-2

And step six, paving a lower yellow sand layer. Before the yellow sand layer is laid, a supplier is well studied, and multiple indexes such as good gradation, organic matter content and the like need to be controlled. The yellow sand layer is divided into an upper layer and a lower layer with different grading, the lower layer has larger yellow sand grain diameter, and the upper layer has smaller yellow sand grain diameter. And paving the upper layer of yellow sand after the lower layer of yellow sand is paved. And (4) screening sand again after the yellow sand enters the field to ensure the gradation of the yellow sand. And paving after the yellow sand screening is finished, compacting while paving, and leveling by using a laser grader. The laser land leveller gradually enlarges the land leveling area according to the mode of first small circle and then large circle. After leveling the ground, measuring by using a laser ruler, and controlling the elevation error; specifically, the thickness of the lower layer of yellow sand is 15cm, and the thickness of the upper layer of yellow sand is 15 cm.

Wherein, the grain diameter of the lower layer yellow sand is as follows:

screen mesh size	Passage Rate (%)
		8mm	100
4mm	98-100
		2mm	80-100
1mm	50-85
		0.5mm	20-55
0.25mm	5-25
		0.125mm	0-3
0.063mm	0-2

And (seventhly), laying an upper-layer yellow sand layer. Before the yellow sand layer is laid, a supplier is well studied, and multiple indexes such as good gradation, organic matter content and the like need to be controlled. And (4) screening sand again after the yellow sand enters the field to ensure the gradation of the yellow sand. And after the upper layer of yellow sand is screened, mixing the yellow sand with organic matters and then paving, wherein the organic matters are uniformly stirred by rotary tillage of a tractor during paving, compacted while paving, and leveled by a laser grader. The laser land leveller gradually enlarges the land leveling area according to the mode of first small circle and then large circle. After leveling the ground, measuring by using a laser ruler, and controlling the elevation error; specifically, the organic matter consists of turfy soil, compound fertilizer and water-retaining agent.

Wherein, the indexes of the upper layer yellow sand are as follows:

and (eighthly), finely leveling the field. The laser grader is again used to level the ground, and the circle is repeatedly turned to scrape and compact the ground.

And step nine, installing an automatic sprinkling irrigation control system. The installation is sprayed the program controller, is connected solenoid valve and control wire, is connected solenoid valve control circuit through spraying the program controller with the water pump control switch board simultaneously, carries out the commissioning debugging.

Installing the sprinkler, paying off according to a design drawing, and determining the terminal position of the sprinkler. Connecting a universal joint to adjust the height of the spray head, wherein the height of the top surface of the straw hat cup of the spray head is required to be flush with the surface of the lawn; specifically, two sets of rain bird controllers are adopted to control the two electromagnetic valves to work. The 24 rain birds 8005ss football field special nozzles are all provided with matched American imported straw hat cups.

And (ten) testing water. And opening a control switch, delivering water and flushing a pipeline to ensure that the lawn can be planted after the irrigation system can normally operate.

Step eleven, implanting anchoring grass. The anchoring grass is implanted by a high-precision special machine. The special machine cuts the bundle of the anchoring grass fibers into a section of 40cm, a special steel nail presses the middle part of the cut anchoring grass fibers, the anchoring grass fibers are implanted into the yellow sand layer, the implantation depth is 18cm, and the height left on the ground surface is 2 cm. The special steel nail can pull out the anchoring grass fiber after being implanted, and the anchoring grass fiber cannot be taken out due to the special structure of the steel nail. The anchoring grass is arranged in a grid matrix after being implanted. Before the construction of the special machine, a total station is used for dotting in advance and pulling the wire. The special machine moves along the pulled line, and anchoring grass in an area about 2 meters wide can be implanted each time; each bundle of anchoring grass consists of 6 fibers, the fibers are made of PP materials, and the spacing between the anchoring grass is 20mm multiplied by 20 mm.

Step twelve, sowing real grass; sowing true grass in spring; and covering protection and pollution prevention measures are taken for the site before real grass is sown. The temperature for the growth of the grass stems is required to be ensured when the real grass is sowed. When selecting grass seeds, the green period is selected as far as possible, the grass seeds are insensitive to air temperature, are trampling resistant, have strong pest and disease resistance, are suitable for growing in sandy soil with good drainage, are not easy to scratch the skin of people, and have elasticity, foot feeling and football friction coefficient which can meet the requirements of international events; specifically, the real grass is selected from Lanyin No.3 lawn type Zoysia japonica (Zoosyia japonica v.Lanyin NO.3) which has high temperature resistance, good cold resistance and strong pest and disease resistance, is suitable for growing on sandy soil with good drainage and has medium fertility requirement.

Specifically, the transportation of real grass stems: when the ambient temperature is 30 ℃, the transportation time exceeds 12 hours, and a cold chain transport vehicle at 10 ℃ is required for transportation; when the ambient temperature is lower than 30 ℃, the straw can be packaged by adopting a packing material with good air permeability, the straw is transported by adopting a rail type carriage, and the straw transportation time is not longer than 72 hours.

Technical requirements for producing grass stalks for lang 3 turf:

index (I)	Require that
		Density of stems	(1.5-4) pieces/cm 2
Coverage degree	100％
		Number of weeds	Less than 0.05%
Disease characteristics	Is composed of
		Characteristics of insect infestation	Is composed of

Technical requirements of No.3 grass stems:

index (I)	Require that
		Length of grass stem	3-5cm
Grass stem	Does not contain mud and needs to be washed clean
		Stem node	Each grass stem must contain 2-3 stem nodes

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Although the reference numerals in the figures are used more here: the method comprises the following terms of a field 1, sprinkling irrigation pipe ditch sand padding 2, sprinkling irrigation water pipes 3, backfill sand 4, backfill soil 5, geotextile 6, broken stone 7 at the bottom of a drainage pipe ditch, a drainage pipe 8, backfill broken stone 9, a broken stone drainage layer 10 at the lower layer, a broken stone drainage layer 11 at the upper layer, a yellow sand layer 12 at the lower layer, an upper yellow sand layer 13 mixed with organic matters, a sprayer 14 with a spray head straw cap cup at the top, anchoring grass 15, real grass 16, anchoring grass fiber 17 after being cut off, steel nails 18 and the like, but the possibility of using other terms is not eliminated. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims (9)

1. An anchor type mixed lawn for a football field is characterized in that: the device comprises a field (1) which is leveled and compacted, sprinkling irrigation pipe ditch sand cushion (2), sprinkling irrigation water pipes (3), backfill sand (4), backfill soil (5), geotextile (6), broken stones (7) at the bottom of a drainage pipe ditch, a drainage pipe (8), backfill broken stones (9), a lower broken stone drainage layer (10), an upper broken stone drainage layer (11), a lower yellow sand layer (12) and an upper yellow sand layer (13) mixed with organic matters, wherein the ground is leveled and compacted; firstly cutting off the anchoring grass fibers on the upper-layer yellow sand layer (13), then implanting the cut-off anchoring grass fibers (17) into the upper-layer yellow sand layer (13) by using steel nails (18), then pulling out the steel nails (18), remaining the anchoring grass fibers (17) in the upper-layer yellow sand layer (13) to form a piece of anchoring grass (15), and finally planting real grass (16) around the anchoring grass (15); a construction method of an anchored mixed lawn in a football field comprises the following steps:

compacting and paying off a field (1); the field is roughly leveled, and a bucket forklift is adopted for primarily leveling the field, so that the field is not too large in depression, and the fine leveling work speed is accelerated; the fine leveling work controls the elevation block by block according to a square grid put in advance, and the leveling instrument tracks and measures; the flatness and the gradient are controlled according to the requirements of a drawing design finished surface; after leveling, a vibration road roller is selected for rolling;

step two, laying a sprinkling irrigation system; excavating a pipe trench according to the sprinkling irrigation system diagram; the sprinkling irrigation system diagram needs to consider that a sufficient number of spray heads are arranged in the whole football field; the infield spray heads are 360-degree full-circumference spray heads, the spray heads at the side lines and the end lines are adjustable semicircular spray heads, and the spray heads at the four corners are adjustable 90-degree spray heads; the sprinkling irrigation system can normally sprinkle all the court needing sprinkling irrigation within any 24 hours; the system has the capability of rapidly sprinkling water to the whole court within 15 minutes; after the irrigation water pipe ditch is excavated, laying sand at the bottom of the ditch; the sprinkling irrigation water pipe is connected to a certain distance on the ground surface according to the designed size, then placed into a sprinkling irrigation water pipe ditch, connected by an interface, and connected with a vertical pipe at the position of a spray head; after the pipeline is laid, sand is backfilled in the middle of the pipeline, and the interface part of the pipeline is not backfilled;

step three, pressure testing is carried out on the sprinkling irrigation water pipe; blocking a plug of a nozzle connecting pipe, connecting a squeezer at an outlet of one of the stand pipes, and installing an exhaust valve at an outlet of the stand pipe at the highest point of the pipeline; then starting to press; checking whether all joints of the pipeline are broken or leak water; after the compaction test is successful, covering the pipeline with backfill sand, and then backfilling soil; watering, filling soil, tamping, and backfilling to a plain soil surface layer in layers;

step four, laying geotextile and a drain pipe; digging blind drainage ditches or drainage ditches, and then paving a geotextile layer above the plain soil layer, wherein in order to ensure the water-proof effect, the seam of the geotextile needs to ensure the minimum overlapping width; the drain pipes are arranged in a straight line shape, and the distance between the drain branch pipes is 5 m; the drainage branch pipe is a six-sided perforated double-wall corrugated pipe, and the drainage main pipe is a double-wall corrugated pipe; the inner wall of the pipeline is smooth, and the outer wall of the pipeline is solid; the whole drainage pipe ditch is laid and excavated according to a drawing, the pipe ditch is required to be straight, and the ditch bottom is flat; the section of the drain pipe ditch is trapezoidal, and the gradient of the drain pipe ditch is 3 per mill; paving a layer of broken stone at the bottom of the drainage pipe ditch; then laying a drain pipe according to a design drawing; backfilling broken stones to be above the drain pipe;

paving a gravel drainage layer; before the gravel drainage layer is laid, the investigation of a supplier is well done to ensure the grading of the gravel; the gravel drainage layer is divided into an upper layer and a lower layer with different grading, the particle size of the lower layer of gravel is larger, and the particle size of the upper layer of gravel is smaller; after the lower gravel drainage layer is laid, the upper gravel drainage layer is laid; opening up a material transfer yard at one corner close to the court, and paving the broken stones from near to far; paving a broken stone drainage layer by means of a laser land leveler, and paving and compacting simultaneously; after leveling the ground, measuring by using a laser ruler, and controlling the elevation error;

step six, paving a lower yellow sand layer; before the yellow sand layer is laid, the thorough investigation of suppliers is done, and multiple indexes such as good gradation, organic matter content and the like need to be controlled; the yellow sand layer is divided into an upper layer and a lower layer with different grading, the grain diameter of the lower layer of yellow sand is larger, and the grain diameter of the upper layer of yellow sand is smaller; paving the upper layer of yellow sand after the lower layer of yellow sand is completely paved; screening sand again after the yellow sand enters the field to ensure the gradation of the yellow sand; paving after the yellow sand screening is finished, compacting while paving, and leveling by using a laser land leveler; the laser land leveller gradually enlarges the land leveling area in a mode of first small circle and then large circle; after leveling the ground, measuring by using a laser ruler, and controlling the elevation error;

laying an upper yellow sand layer; before the yellow sand layer is laid, the thorough investigation of suppliers is done, and multiple indexes such as good gradation, organic matter content and the like need to be controlled; screening sand again after the yellow sand enters the field to ensure the gradation of the yellow sand; sieving the sand of the upper layer of yellow sand, mixing the sand with organic matters, paving, carrying out rotary tillage by using a tractor during paving, uniformly stirring the organic matters, compacting while paving, and leveling by using a laser grader; the laser land leveller gradually enlarges the land leveling area in a mode of first small circle and then large circle; after leveling the ground, measuring by using a laser ruler, and controlling the elevation error;

step eight, finely flattening the field; leveling the ground by using the laser grader again, and repeatedly rotating the laser grader to scrape and compact the ground;

step nine, installing an automatic sprinkling irrigation control system; installing a spray irrigation program controller, connecting the electromagnetic valve with a control wire, and connecting an electromagnetic valve control circuit with a water pump control power distribution cabinet through the spray irrigation program controller to perform test run debugging;

installing a sprinkler, paying off according to a design drawing, and determining the terminal position of the sprinkler; connecting a universal joint to adjust the height of the spray head, wherein the height of the top surface of the straw hat cup of the spray head is required to be flush with the surface of the lawn;

step (ten), testing water; turning on a control switch, supplying water and flushing a pipeline to ensure that the irrigation system can normally operate and then the lawn can be planted;

step eleven, implanting anchoring grass; the anchoring grass is implanted by a high-precision special machine; cutting the bundle of the anchoring grass fibers into a section of 40cm by a special machine, pressing the middle part of the cut anchoring grass fibers by a special steel nail, implanting the anchoring grass fibers into a yellow sand layer, wherein the implantation depth is 18cm, and the height left on the ground surface is 2 cm; the anchoring grass fibers are implanted and then pulled out by the special steel nails, and the anchoring grass cannot be taken out due to the special structure of the steel nails; the anchoring grass is arranged in a grid matrix after being implanted; before the construction of the special machinery, a total station is used for dotting in advance, and a wire is pulled; the special machine moves along the pulled line, and anchoring grass in an area about 2 meters wide can be implanted each time;

step twelve, sowing real grass; covering protection and anti-pollution measures are taken for the site before real grass is sown; the temperature for ensuring the growth of grass stems is needed for sowing real grass; when selecting grass seeds, the grass seeds are selected as far as possible, have long green period, are not sensitive to air temperature, are resistant to trampling, have strong disease and pest resistance, are suitable for growing in sandy soil with good drainage, are not easy to scratch the skin of people, and have elasticity, foot feeling and football friction coefficient which can meet the requirements of international events.

2. The anchoring type mixed lawn in the football field as claimed in claim 1, wherein in the second step, the sprinkler irrigation system works simultaneously according to 24 sprinklers, a main water supply PE pipe DE200 is designed, the left and right PE pipes DE125 are arranged after entering the football field, electromagnetic valves are respectively arranged on the pipes, and the branch pipes are divided into DE90 and DE63 according to the design; wherein, the sprinkling irrigation water pipe adopts a PE pipe, the nominal pressure resistance is 1.0MPa, and the buried depth is 80 cm; wherein, 5-8cm thick sand pad is paved at the bottom of the pipe trench.

3. The football field anchoring type mixed lawn of claim 1, wherein after the pressing in the third step, the experimental pressure is 1.5 times (0.9Mpa) of the working pressure (0.6Mpa) of the nozzle, and the pressure drop within 60 minutes is not more than 0.05Mpa, which is qualified; wherein, after the pressure test is successful, the thickness of the backfilled sand covered pipeline is 5 cm.

4. The football field anchoring type hybrid lawn of claim 1, wherein in the step (IV), the geotextile is selected to be 300g/m2, and the minimum overlapping width (overlapping width) of the geotextile is 30 cm; the drainage branch pipe is a six-sided perforated double-wall corrugated pipe with ring stiffness SN8DN110HDPE, and the drainage main pipe is a double-wall corrugated pipe with ring stiffness SN8DN200 HDPE; the drainage branch pipe ditch is trapezoidal in cross section, the top width is not less than 30cm, the bottom width is not less than 20cm, the depth is not less than 20cm, the drainage main pipe ditch is trapezoidal in cross section, the top width is not less than 40cm, the bottom width is not less than 30cm, the depth is not less than 30cm, 5cm of crushed stone is paved at the bottom of the drainage pipe ditch, and 5cm of crushed stone is backfilled above a drainage pipe.

5. A football pitch anchored hybrid lawn as claimed in claim 1, wherein in step (v), the thickness of the lower gravel drainage layer is 15 cm; the thickness of the upper gravel drainage layer is 5 cm; in the step (VI), the thickness of the lower layer of yellow sand is 15cm, and the thickness of the upper layer of yellow sand is 15 cm.

6. The football field anchoring type mixed lawn of claim 1, wherein the organic matter in the step (seven) is composed of turfy soil, compound fertilizer and water retention agent.

7. The football field anchored mixed lawn of claim 1, wherein two sets of rain and bird controllers are adopted in step (nine), and two electromagnetic valves are controlled to work; the 24 rain birds 8005ss football field special nozzles are all provided with matched American imported straw hat cups.

8. A football pitch mixed turf as claimed in claim 1 wherein in step (eleven) each grass strand consists of 6 fibres, the fibres being PP, the grass strands being spaced apart by 20mm x 20 mm.

9. The football field anchoring type mixed lawn of claim 1, wherein in the step (twelve), the protection and pollution prevention measures are that a layer of 80g/m2 geotextile is covered on the whole field, a green dust screen is covered on the whole field, and the iron railings around the whole field are protected; wherein, the transportation of real grass stems: when the ambient temperature is 30 ℃, the transportation time exceeds 12 hours, and a cold chain transport vehicle at 10 ℃ is required for transportation; when the ambient temperature is lower than 30 ℃, the straw can be packaged by a packing material with good air permeability, and transported by a rail type carriage, and the straw transportation time is not longer than 72 hours.

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