CN105888227A - Ultrahigh horn-shaped steel structure exterior facing construction platform, equalizing beam for construction and construction method of ultrahigh horn-shaped steel structure exterior facing construction platform - Google Patents

Abstract

The invention discloses a construction platform for the outer surface of a super-high horn-shaped steel structure, a balance beam for construction and a construction method thereof. A construction panel; a cable is connected between the construction panel and the overhang; a protective net fixed to the overhang is provided at the edge of the construction panel; the balance beam includes a balance arm and an outer end of the balance arm The counterweight is provided with two suspension lugs on the balance arm; the construction method includes various steps from main girder fabrication to protection net installation. The construction platform of the invention is easy to use, saves a large amount of steel materials, works at heights quickly and safely, and materials can be reused, thereby reducing costs. The balance beam disclosed by the invention is easy to use, and the main beam is directly bound to it during hoisting, so the use has high safety. The construction method of the invention has compact flow, fast production speed and high safety of the produced construction platform.

Description

Construction platform for super-high trumpet-shaped steel structure exterior surface, balance beam for construction and its construction method

technical field

The invention belongs to the construction field of ultra-high trumpet-shaped steel structures, and in particular relates to a construction platform for exterior decoration of super-high trumpet-shaped steel structures, a balance beam for construction and a construction method thereof.

Background technique

Tower buildings, especially ultra-high tower buildings, such as multi-functional transmission towers, etc., the part above the base of the positive and negative zero is a steel structure, with a total height of more than 150 meters; the outer decorative surface of the steel structure is mostly made of glass and aluminum plates Wait for the curtain wall.

For the exterior decoration construction of this type of building, hanging baskets can be selected for the tower body; however, for the horn-shaped structure with a large top and a small bottom, the horizontal distance from the upper end of the horn is almost 10m, or even greater than 10m. For the construction of the exterior decoration surface of this part, an operating platform must be erected. The construction platform is made of steel components cantilevered from the steel structure of the tower body.

The cantilevered construction platform and decoration construction belong to ultra-high-altitude operations. The wind load has a great impact on the installation and positioning of the steel structure and the safe construction. The worker's operation is difficult and dangerous. At the same time, the deflection value of the super-long cantilevered steel member has a quadratic relationship with the cantilever span, and the construction platform's own load and wind load have high requirements on the rigidity of the platform support system.

At present, there are two construction methods for the cantilevered construction platform:

1. Steel pipe scaffolding is used to cantilever layer by layer, and finally reach the cantilever length. The problems of this method are: large amount of steel is used, the construction platform itself has a large load, and the stability is poor; and the erection period is long, and the safety risk of ultra-high-altitude installation bigger.

2. A single-layer I-steel truss cantilever is adopted, and a steel wire rope is installed on the top to unload the load. This method replaces the steel pipe with a truss beam composed of channel steel and I-steel, which can better solve the problem of the stiffness of the cantilever frame itself, but its The following problems still exist: the construction load is large, and the small-section truss is difficult to meet the rigidity requirements; and the cantilever length of the truss is more than 7 meters, the steel structure of the tower body is under heavy force, and the safety is still low.

Contents of the invention

The invention aims to provide a super-high trumpet-shaped steel structure outer decoration construction platform with fast construction and safe use, a balance beam for construction and a construction method thereof.

In order to solve the above-mentioned technical problems, the present invention provides the following technical proposal: construction platform for the outer surface of the ultra-high horn-shaped steel structure, the cross-section of the ultra-high horn-shaped steel structure is circular, and the top is provided with a cantilevered part, including construction panels, Cables and protective nets;

The construction panel includes at least two main beams and secondary beams connected between two adjacent main beams, the main beams are trusses, and the secondary beams are H-shaped steel;

The construction panel is located under the overhanging part, and the construction panel is fixed horizontally around the circumference of the super-high trumpet-shaped steel structure and fixedly connected with the super-high trumpet-shaped steel structure;

The stay cable is connected between the construction panel and the overhang;

The protective net is set at the edge of the construction panel and is fixedly connected with the overhanging part.

The upper and lower chords and webs of the main girder are all seamless steel pipes, and the main girder is arranged along the radial direction of the circle where the cross-section of the super-high trumpet-shaped steel structure is located;

The main beam is fully penetrated butt-welded with a connecting plate, and the secondary beam and the connecting plate are connected by high-strength bolts; the upper part of the main beam and the secondary beam is covered with pine springboards, and the pine springboard and the secondary beam are fixed by high-strength bolts. The thickness of the pine springboard is 30~ 50mm.

The protective net includes safety guardrails, dense mesh safety nets, safety flat nets and steel wire meshes arranged sequentially from the inside to the outside. The safety guardrails are fixed on the construction panel, and the height of the safety guardrails is 1300~1700mm; The mesh is fixed on the steel wire mesh; a cantilevered channel steel is set on the top of the cantilevered part. The cantilevered channel steel is horizontal and set corresponding to the main beam.

The steel wire mesh includes vertical steel wire ropes arranged vertically and horizontal steel wire ropes arranged horizontally, and the vertical steel wire ropes and horizontal steel wire ropes are connected by iron wires; the distance between adjacent vertical steel wire ropes is less than 2000mm, and the distance between adjacent horizontal steel wire ropes is less than 1500mm.

A U-shaped mounting plate is arranged on the inner end of the main beam;

A hoop is installed on the super-high trumpet-shaped steel structure, and a rubber gasket is provided at the joint between the inner wall of the hoop and the super-high trumpet-shaped steel structure;

The ear plate is welded on the hoop, and the ear plate and the mounting plate are fixedly connected by pressure-bearing high-strength bolts.

The cables are distributed between each main beam and the overhanging part. The cables include inner cables and outer cables parallel to each other. The distance between the outer cables and the outer end of the main beam is 800~1200mm; The distance between the outer ends of the beam is 1/5~3/5 of the total length of the main beam.

The lower end of the cable is wound around the main beam and fixed by a wire rope clamp. The contact between the cable and the main beam is provided with a rubber lining; the overhanging part is equipped with a ring for the cable, and the upper end of the cable is fixedly connected to the ring.

The suspension ring includes a U-shaped hanging plate, which is made of HPB300 steel bars, and the U-shaped opening of the hanging plate faces upward; two splints are arranged in parallel between the two side walls of the hanging plate, the splints are galvanized steel plates, and the two splints The upper and lower surfaces of the steel plates on the ultra-high trumpet-shaped steel structure are respectively attached, and the cables are wound in the U-shaped mouth of the hanging plate.

The balance beam used for building the construction platform of the super-high trumpet-shaped steel structure exterior surface, including the balance arm and the counterweight located at the outer end of the balance arm, the material of the balance arm is seamless steel pipe, the model is Ф168*6, and the length of the balance arm is 2000 ~3000mm; there are two sling lugs on the balance arm, one of which is set near the outer end of the balance arm; the distance between the other sling lug and the outer end of the balance arm is 800~1000mm.

The construction method of the super-high horn-shaped steel structure exterior surface construction platform includes the following steps:

a. Make the main beam;

First use Ф168*6 seamless steel pipe to make the upper and lower chords of the truss, use Ф102×5 seamless steel pipe to make the web of the truss, and use the truss as the main beam, and the total length of the main beam is ≤10 meters;

The number of main girders is determined according to the diameter of the cross-section of the super-high horn-shaped steel structure. It must be ensured that during installation, each main girder is set along the radius direction of the circle where the cross-section of the super-high horn-shaped steel structure is located. Make a circle around the super-high trumpet-shaped steel structure; then, connect the U-shaped mounting plate on the end of the main girder;

b. Make the hoop according to the diameter of the steel column on the super-high trumpet-shaped steel structure;

There are steel columns on the super-high trumpet-shaped steel structure. When making the hoop, it is necessary to ensure that the hoop can cover the steel column;

The number of hoops is equal to the number of main girders;

The ear plate is welded at the center of the outer arc surface of the hoop, and the hoop and the steel column on the super-high trumpet-shaped steel structure are fixed by high-strength bolts;

c. Make cables and rings;

Set the outer cable on the main beam at a distance of 800~1000mm from the outer end of the main beam, and set the inner cable on the main beam at a distance of 1/5~3/5 of the total length of the main beam from the outer end of the main beam;

d. Make the balance beam, use Ф168*6 seamless steel pipe to make the balance arm, set the counterweight on the outer end of the balance arm, and set the hanging rope hanging lug on the balance arm;

e. Install the main beam,

First, install the lifting rope: tie the balance beam and the main beam together, and hang the lifting rope on the two lifting lugs of the balance beam; because the balance arm and the main beam are bound together, and the lifting lugs are on the balance beam When the balance beam and the main beam are bound, it is necessary to ensure that the two hoisting ropes are respectively located on the outer end of the main beam and 800mm~1000mm away from the outer end of the main beam; at the same time, the auxiliary sling is hoisted on the balance beam. The length of the auxiliary sling is 1.5 times the length of the hoisting rope, and the hoisting point of the auxiliary sling is on the counterweight; connect the hoisting rope and the auxiliary hoisting rope to the lifting device;

Then, open the lifting device; under the action of the lifting device, the main beam reaches the set position, install the outer cable at the outer end of the main beam, and install the inner cable at the inner side of the outer cable, where the distance between the inner cable and the outer end of the main beam is the main 1/5~3/5 of the total length of the beam; adjust the inner cable to a tensioned state, and adjust the outer cable to a relaxed state;

Then, fix the mounting plate on the main beam and the ear plate on the hoop with pressure-bearing high-strength bolts;

Finally, remove the balance beam and the main beam, and then adjust the outer cables to a tensioned state; hoist the balance beam to the ground through the hoisting device, and install the next main beam;

f. Install a secondary beam every time a main beam is installed,

First, the full penetration butt welded connecting plate on the main beam;

Then, use the lifting device to hoist the H-shaped steel to the main beam, and use two high-strength bolts on each connecting plate to connect the connecting plate and the H-shaped steel together to realize the installation of the secondary beam;

g. The construction panel is covered with pine boards;

First, spread the pine springboard with a thickness of 30~50mm on the main beam and the secondary beam to ensure that the connection of the two pine springboards is on the H-shaped steel;

Then, use bolts to connect the H-shaped steel and the pine plank;

h. Install the protective net,

First, install the cantilevered channel steel on the cantilevered part to ensure that there is a cantilevered channel steel above each main girder, and the length of the cantilevered channel steel is ≤ 4 meters;

Subsequently, connect vertical steel wire ropes between the cantilevered channel steel and the main girder, and the distance between adjacent vertical steel wire ropes is less than 2000mm; 1500mm; the place where the horizontal steel wire rope and the vertical steel wire rope meet is connected by iron wire, and a steel wire mesh is formed under the action of the vertical steel wire rope and the horizontal steel wire rope;

Finally, set safety guardrails, dense mesh safety nets and safety flat nets in sequence from the inside to the outside of the steel wire mesh. The dense mesh safety nets and safety flat nets are fixed on the steel wire mesh, and the safety guardrails are fixed at the edge of the main beam, and the height of the safety guardrails 1.3~1.7mm.

Through the above technical scheme, the beneficial effects of the present invention are:

1. The set construction panels, cables and protective nets make a closed construction platform under the super-high trumpet-shaped steel structure; and the construction panels, cables and protective nets can be prepared and constructed separately to improve the construction speed; The cable disperses the load of the ultra-high trumpet-shaped steel structure, ensuring the safety during use;

2. H-shaped steel is used for the secondary beam, and truss is used for the main beam. The combination of the two saves a lot of steel;

3. The protective net includes a safety guardrail, a dense mesh safety net and a safety flat net. The dense mesh safety net and the safety flat net adopt a double-layer enclosure method, which improves the safety during the construction process;

4. The vertical steel wire rope and the horizontal steel wire rope form the skeleton of the protective net, which has high stability and is relatively safe to use;

5. The main girder and the ultra-high trumpet-shaped steel structure are connected through the installation plate and the hoop, and the installation is rapid, thereby improving the construction speed;

6. The cables include external cables and internal cables, thereby fully reducing the load on the construction panel;

7. One end of the cable is connected to the main girder through a wire rope clamp, and the other end is connected to the suspension ring and the overhang, thereby increasing the installation speed of the cable;

8. The lifting ring includes a U-shaped hanging plate and two splints fixed to the hanging plate. The two splints are attached to the upper and lower surfaces of the steel plate, so that the lifting ring is fully in contact with the super-high trumpet-shaped steel structure, and the single-point force is reduced. , improve security;

9. The set balance beam includes hanging lugs and counterweights to ensure the safety of the main beam during hoisting;

10. The construction method of the construction platform has a compact process, and the production sequence and installation sequence of each component are reasonable, which can increase the construction speed and improve the construction effect at the same time, ensuring that the constructed construction platform is safe and durable.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a top view of Fig. 1;

Figure 3 is a schematic diagram of the main beam structure;

Fig. 4 is an enlarged view of part A in Fig. 3;

Fig. 5 is a top view of Fig. 4;

Fig. 6 is an enlarged view of part B in Fig. 3;

Fig. 7 is the left side view of Fig. 6;

Figure 8 is a schematic diagram of the sling structure;

Fig. 9 is a schematic diagram of the connection structure between the secondary beam and the pine springboard;

Fig. 10 is a schematic diagram of the protective net structure;

Figure 11 is a schematic diagram of the balance beam structure;

Fig. 12 is a flow chart of the construction method of the present invention.

detailed description

The super-tall trumpet-shaped steel structure is an existing building with a circular cross-section. Steel columns 11 are arranged at the edges, the floor slab includes steel plates 17, and a cantilevered part 2 is arranged at the top.

The construction platform of super-high trumpet-shaped steel structure exterior decoration as shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 and Fig. 10, including the super-high horn The construction panel 3 fixedly connected to the shaped steel structure 1 is set horizontally; at the same time, the construction panel 3 is located under the cantilevered part 2. The high trumpet-shaped steel structure is arranged circumferentially. When in use, the scaffolding is placed on the construction panel 3 for construction.

The construction panel 3 includes at least two main girders, each of which is arranged along the radial direction of the circle where the cross-section of the super-high trumpet-shaped steel structure is located. The problem of excessive steel structure load. The number of main girders is determined by the diameter of the circle where the cross-section of the super-high trumpet-shaped steel structure is located. After all the main girders are installed, they just go around the super-high trumpet-shaped steel structure 1 for one week. The number of main girders in this embodiment is 16.

The main girder is a truss, the upper chord 311 and the lower chord are Ф168×6 seamless steel pipes; the webs are Ф102×5 seamless steel pipes.

A U-shaped mounting plate 10 is arranged on the inner end of the main girder, and the connection between the mounting plate 10 and the main girder adopts a full-penetration butt welding method. In order to realize the fixation of the construction panel 3 and the ultra-high horn-shaped steel structure, a hoop 8 is arranged on the steel column 11 of the ultra-high horn-shaped steel structure in cooperation with the installation plate 10, and the hoop 8 is fixed by high-strength bolts 13 and steel columns 11; A rubber gasket 101 is provided at the joint between the hoop 8 and the steel column 11. The rubber gasket 101 can increase the friction between the hoop 8 and the steel column 11, thereby increasing the pressure of the hoop 8. ability. An ear plate 9 is welded at the center of the outer arc surface of the hoop 8, and the end of the ear plate 9 extends into the U-shaped mounting plate 10; at the same time, the ear plate 9 and the mounting plate 10 are fixedly connected by pressure-bearing high-strength bolts 12 , through the fixed connection of the ear plate 9 and the mounting plate 10, the fixed connection of the main girder and the super-high trumpet-shaped steel structure is realized, and then the fixed connection of the construction panel and the super-high trumpet-shaped steel structure is realized. Among them, pressure-bearing high-strength bolts and high-strength bolts are commercially available products, and the high is not a limit to the degree, but indicates the type of bolt together with the pressure-bearing high-strength.

The definition of outside and inside is as follows: the one close to the super-high trumpet-shaped steel structure is inside, and the one far away is outside.

A secondary beam 32 is connected between two adjacent main beams. The secondary beam 32 is H-shaped steel. At the same time, the secondary beam 32 is arranged along the tangent direction of the concentric circle of the ultra-high trumpet-shaped steel structure, so as to realize the dispersion of force and reduce the cost. The load of the construction platform on the super-high trumpet-shaped steel structure.

In order to realize the connection between the main girder and the secondary beam 32, the upper chord 311 of the main girder is provided with a connecting plate 14, and the connection mode between the connecting plate 14 and the upper chord 311 is full penetration butt welding; Bolt 13 is connected, thereby facilitates the connection of both in high altitude. The main beam and the secondary beam 32 tops are covered with pine boards 20, the thickness of the pine boards 20 is 30-50 mm, preferably 40 mm, and the boards made of pine materials are durable and have a long service life. The pine plank 20 and the secondary beam 32 are fixed by high-strength bolts 13, while ensuring that the junction of the two pine planks 32 is located on the secondary beam 32, thereby ensuring the safety of the construction platform during use.

In order to further improve the use safety of the construction platform, a cable is provided between the construction panel 3 and the overhanging part 2, and the cable includes an inner cable 41 and an outer cable 42 arranged in parallel. The distance between the outer cable 42 and the outer end of the main beam is 800-1200mm; the distance between the inner cable 41 and the outer end of the main beam is 1/5-3/5 of the total length of the main beam, preferably 2/5. Wherein the inner cable 41 and the outer cable 42 respectively include two steel wire ropes 43, here by setting the inner cable and the outer cable, and designing the positions of the inner cable and the outer cable, the construction can be greatly improved. The safety of the panel 3 enables the construction panel 3 to disperse the load of the ultra-high trumpet-shaped steel structure.

In order to ensure that the installation of the dragline is stable, the connection mode of the steel wire rope 43 forming the dragline is as follows:

The lower end of the wire rope 43 is wound around the upper chord 311 and fixed by the wire rope clamp 19; at the same time, a rubber lining 18 is provided at the joint between the wire rope 43 and the upper chord 311, thereby reducing the stress on the wire rope 43 during use. Abrasion; the steel wire rope clamp 19 is a commercially available product, and in order to ensure the strength during use, the number of steel wire rope clamps 19 used on each steel wire rope is three.

The upper end of wire rope 43 is fixedly connected with steel plate 17 by suspension ring, and suspension ring comprises suspension plate 15 and the splint 16 that is all fitted with the upper and lower surfaces of steel plate 17, and two splints 16 are all connected with U-shaped suspension plate 15, and suspension plate 15 is made of The HPB300 steel bar is bent and formed. When installing, the U-shaped opening of the suspension plate 15 faces upwards, and the steel wire rope 43 is wound between the splint 16 and the suspension plate 15 that fit the lower surface of the steel plate 17 .

The pulling force of the construction panel 3 on the ultra-high trumpet-shaped steel structure is reduced by the cable, which ensures the safety of the construction panel during use.

In order to further ensure the safety of the construction panel 3 during use, a protective net is provided at the edge of the construction panel 3 , and the protective net is used to prevent objects or people from falling from the edge of the construction panel 3 . The upper part of the protective net is fixedly connected with the overhanging part 2, and the lower part is fixedly connected with the construction panel 3.

The protective net includes a safety guardrail, a dense mesh safety net, a safety flat net and a steel wire mesh arranged sequentially from the inside to the outside. The safety guardrail is fixedly connected with the construction panel 3, and the height of the safety guardrail is 1300-1600mm, preferably 15mm. Wire mesh is as the support of protective net, comprises the vertical steel wire rope 61 of vertical setting and the horizontal steel wire rope 62 of horizontal setting, and the joint of vertical steel wire rope 61 and horizontal steel wire rope 62 is connected by iron wire, and iron wire is not shown in the figure. The distance between adjacent vertical steel wire ropes 61 is less than 2000mm, and the distance between adjacent horizontal steel wire ropes 62 is less than 1500mm, thereby ensuring the safety of users.

In order to ensure the fixation of the wire mesh, hot-rolled cantilevered channel steel 7 is fixed on the top of the cantilevered part 2, and the cantilevered channel steel 7 is set for the main beam to ensure that there is a horizontal cantilever above each main beam Channel steel 7, cantilevered channel steel 7 is used for fixing the top of steel wire netting, and the bottom of steel wire netting and girder are fixed and get final product.

After the steel wire mesh is built, it is enough to fix the dense mesh safety net and the safety flat net on the steel wire mesh. Both the dense mesh safety net and the safety flat net are commercially available products.

The construction platform described in the present invention is easy to use, saves a lot of steel materials through the combination of truss and H-shaped steel, and at the same time, the construction platform is convenient to build, and the connection with the ultra-high trumpet-shaped steel structure adopts the method of hoop pin connection , High-altitude operations are fast and safe, and materials can be reused, reducing costs.

The present invention also discloses a balance beam for building the construction platform of the super-high horn-shaped steel structure exterior surface, as shown in Figure 11, including a balance arm 20, the material of the balance arm 20 is seamless steel pipe, and the model is Ф168*6 ; The length of the balance arm 20 is 2000~3000mm, preferably 2900mm, so as to fully satisfy the hoisting of the main girder.

A counterweight 22 is arranged on the outer end of the balance arm 20. The weight of the counterweight 22 is related to the length of the balance arm and the weight of the main girder. After the main beam and the balance arm 20 are fixed, they can Keep the balance arm level.

For the convenience of hoisting, two sling lugs 21 are arranged on the balance arm 20, one of the two sling lugs is set near the outer end of the balance arm 20; The distance is 800~1000mm.

The balance beam disclosed by the invention is easy to use, and the main beam is directly bound to it during hoisting, so the use has high safety.

The present invention also discloses a construction method of the construction platform for the exterior surface of the above-mentioned ultra-high trumpet-shaped steel structure, which includes the following steps:

a. Make the main beam;

First, use Ф168*6 seamless steel pipe to make the upper and lower chords of the truss, use Ф102×5 seamless steel pipe to make the web of the truss, and use the truss as the main beam. The total length of the main beam is ≤10 meters; The number is determined according to the diameter of the cross-section of the super-high horn-shaped steel structure. It must be ensured that during installation, each main girder is set along the radial direction of the circle where the cross-section of the super-high horn-shaped steel structure 1 is located. A week of tall trumpet-shaped steel structure;

Subsequently, a U-shaped mounting plate 10 is connected to the end of the main girder for connection and fixation with the ultra-high trumpet-shaped steel structure 1 .

b. Make the hoop according to the diameter of the steel column on the super-high trumpet-shaped steel structure;

The diameter of the hoop 8 is determined by the steel column 11, and it must be ensured that the hoop 8 can cover the steel column 11 therein. The number of hoops 8 is equal to the number of the main girders, so as to ensure that each main girder is fixed by the hoops and the ultra-high trumpet-shaped steel structure 1 when connected. The ear plate 9 is welded at the center of the outer arc surface of the hoop 8, and the steel column 11 on the hoop 8 and the super-high horn-shaped steel structure 1 is fixed by high-strength bolts 13.

c. Make cables and rings;

An outer stay cable 42 is arranged at a distance of 800-1000 mm from the outer end of the main beam on the main beam; an inner stay cable 41 is arranged at a place 1/5 to 3/5 of the total length of the main beam from the outer end of the main beam on the main beam. Wherein the connection mode of inner stay cable 41 and outer stay cable 42 and main girder is that the steel wire rope 43 that will form inner stay cable 41 and outer stay cable 42 is wound on the main girder, and the upper end of steel wire rope 43 is fixed by wire rope clip 19 and gets final product.

d. Make a balance beam;

The balance arm 20 is made of Ф168*6 seamless steel pipe, a counterweight 22 is set on the outer end of the balance arm 20, and two hanging rope lugs 21 are set on the balance arm to complete the production of the balance beam. The ear 21 is set close to the outer end of the balance arm 20; the distance between the other sling hanging ear 21 and the outer end of the balance arm 20 is 800-1000mm.

e. Install the main beam,

First, install the lifting rope: bind the balance beam 23 and the main beam together, and hang the lifting rope on the two lifting lugs 21 of the balance beam 23; when binding the balance beam 23 and the main beam, it is necessary to ensure that the two The hoisting ropes are respectively located on the outer end of the main girder and on the main girder at a distance of 800 mm to 1000 mm from the outer end of the main girder. At the same time, in order to improve safety, an auxiliary sling is hoisted on the balance beam 21. The length of the auxiliary sling is 1.5 times the length of the hoisting rope, and the lifting point of the auxiliary sling is on the counterweight 22, thereby fully ensuring safety during use. .

Then, the hoisting rope is connected with the hoisting device, and the hoisting device is opened so that the hoisting device drives the balance beam 23 and the main beam to the set position; Inner cable 41, the distance between the inner cable and the outer end of the main beam is 800mm ~ 1000mm; the inner cable 41 is adjusted to a tensioned state, the outer cable 42 is adjusted to a loose state, and the inner cable 41 carries out load-bearing, improving the main beam. Safety during installation of beams and super-tall flared steel structures.

Subsequently, the mounting plate 10 on the main girder and the ear plate 9 on the hoop 8 are fixed by pressure-type high-strength bolts 12 .

Finally, the balance beam and the main beam are removed, and the outer cables are adjusted to a tensioned state; the balance beam is hoisted to the ground through the hoisting device;

When installing the main girder, the inner cable is first adjusted to a tensioned state. After the main girder and the super-high trumpet-shaped steel structure are fixed, the outer cable is adjusted to a tensioned state, which facilitates the safety of the main girder; here , after the main girder is installed, adjust the outer cable to the tensioned state, which can ensure the full force of the outer cable.

When installing the main beam, install it in a clockwise order.

f. Installation of secondary beams;

Firstly, the connection plate 14 is fully penetrated butt welded on the girder.

Then, hoist the H-shaped steel to the main beam, and use two high-strength bolts 13 on a connecting plate 14 to connect the connecting plate 14 and the H-shaped steel together to realize the installation of the secondary beam.

g, repeat step e and step f;

During installation, every time a main girder is installed, a secondary girder is installed until the main girder wraps around the ultra-high trumpet-shaped steel structure.

h. Laying pine planks;

The thickness is 30 ~ 50mm, preferably the pine springboard 20 of 40mm is fully spread on the gap between the H-shaped steel and the adjacent H-shaped steel, so as to ensure that the connection of the two pine springboards 20 is on the H-shaped steel; Sectional steel and pine gangplanks are joined. In this way, the upper part of the H-shaped steel forms a plane, and the scaffolding can be directly placed on it when in use.

i. Install the protective net,

First, install the cantilevered channel steel 7 on the cantilevered part 2, the length of the cantilevered channel steel 7 is ≤ 4000mm, and ensure that there is a cantilevered channel steel 7 above each main girder;

Subsequently, connect the vertical wire rope 61 between the cantilevered channel steel 7 and the main girder to ensure that the distance between two adjacent vertical wire ropes 61 is less than 2000mm; The distance between the horizontal steel wire ropes 62 is less than 1500mm; the place where the horizontal steel wire ropes 62 and the vertical steel wire ropes 61 meet is connected by iron wires, and the steel wire mesh is formed by the vertical steel wire ropes and the horizontal steel wire ropes;

Finally, a safety guardrail 5, a dense mesh safety net and a safety flat net are sequentially set on the inner side of the steel wire mesh from the inside to the outside, wherein the safety guardrail 5 is fixed on the construction panel, and the height of the safety guardrail is 1300-1700mm, preferably 1500mm. Both the mesh safety net and the safety flat net are fixed on the steel wire mesh, and both the dense mesh safety net and the safety flat net are commercially available products. The double-layer maintenance method of dense mesh safety net and safety flat net is used to realize complete closure, which ensures the safety of the construction platform during use.

The construction method of the present invention has a compact flow and a reasonable design, and the materials used in it have a sequential production sequence, which avoids waste of materials, has fast production speed, and the produced construction platform has high safety.

Claims (10)

1. The super-high trumpet-shaped steel structure exterior construction platform, the cross-section of the super-high trumpet-shaped steel structure is circular, and the top is provided with a cantilevered part. protective nets at the edges; The construction panel includes at least two main beams and secondary beams connected between two adjacent main beams, the main beams are trusses, and the secondary beams are H-shaped steel; The construction panel is located under the overhanging part, and the construction panel is fixed horizontally around the circumference of the super-high trumpet-shaped steel structure and fixedly connected with the super-high trumpet-shaped steel structure; The stay cable is connected between the construction panel and the overhang; One end of the protective net is fixedly connected with the construction panel, and the other end is fixedly connected with the overhanging part. 2. The super-high trumpet-shaped steel structure exterior construction platform as claimed in claim 1, characterized in that: The upper and lower chords and webs of the main girder are all seamless steel pipes, and the main girder is arranged along the radial direction of the circle where the cross-section of the super-high trumpet-shaped steel structure is located; The main girder is matched with the sub-beam full-penetration butt-welded connecting plate, and the secondary beam and the connecting plate are connected by high-strength bolts; The upper part of the main beam and the secondary beam is covered with pine springboard, and the pine springboard and the secondary beam are fixed by high-strength bolts. The thickness of the pine springboard is 30~50mm. 3. The super-high horn-shaped steel structure exterior construction platform as claimed in claim 2, characterized in that: the protective net includes safety guardrails, dense mesh safety nets, safety flat nets and steel wire nets arranged in sequence from the inside to the outside. The guardrail is fixed on the construction panel, and the height of the safety guardrail is 1300~1700mm; the dense mesh safety net and the safety flat net are fixed on the steel wire net; a cantilevered channel steel is set on the top of the cantilevered part, and the cantilevered channel steel is horizontal And corresponding to the setting of the main beam, one end of the wire mesh is fixedly connected to the cantilevered channel steel, and the other end is fixedly connected to the main beam. 4. The super-high horn-shaped steel structure exterior construction platform as claimed in claim 3, characterized in that: the steel wire mesh comprises a vertical steel wire rope arranged vertically and a horizontal steel wire rope arranged horizontally, between the vertical steel wire rope and the horizontal steel wire rope Connected by iron wire; the distance between adjacent vertical steel wire ropes is less than 2000mm, and the distance between adjacent horizontal steel wire ropes is less than 1500mm. 5. The super-high horn-shaped steel structure exterior construction platform according to any one of claims 1 to 4, characterized in that: a U-shaped mounting plate is arranged on the inner end of the main girder; A hoop is installed on the super-high trumpet-shaped steel structure, and a rubber gasket is provided at the joint between the inner wall of the hoop and the super-high trumpet-shaped steel structure; The ear plate is welded on the hoop, and the ear plate and the mounting plate are fixedly connected by pressure-bearing high-strength bolts. 6. The super-high horn-shaped steel structure exterior construction platform as claimed in claim 5, characterized in that: the drag cables are distributed between each main girder and the overhanging part, and the drag cables include inner drag cables parallel to each other and For the outer cable, the distance between the outer cable and the outer end of the main beam is 800~1200mm; the distance between the inner cable and the outer end of the main beam is 1/5~3/5 of the total length of the main beam. 7. The super-high horn-shaped steel structure exterior construction platform as claimed in claim 6, characterized in that: the lower end of the cable is wound on the main beam and fixed by a wire rope clamp, and the contact between the cable and the main beam is provided with a The inner lining made of rubber material; the suspension part is provided with a suspension ring in cooperation with the cable, and the upper end of the cable is fixedly connected with the suspension ring. 8. The construction platform of super-high trumpet-shaped steel structure exterior surface as claimed in claim 7, characterized in that: the suspension ring comprises a U-shaped hanging plate, the hanging plate is made of HPB300 steel bars, and the U-shaped opening of the hanging plate faces upward; There are two splints arranged in parallel between the two side walls of the hanging plate. The splints are galvanized steel plates. The two splints are respectively attached to the upper and lower surfaces of the steel plate on the super-high trumpet-shaped steel structure. The cables are wound around the hanging plate. Inside the U-shaped mouth. 9. The balance beam for building the super-high horn-shaped steel structure exterior construction platform according to claim 8, characterized in that: it includes a balance arm and a counterweight positioned at the outer end of the balance arm, the material of the balance arm is seamless steel pipe, and the model The length of the balance arm is Ф168*6, and the length of the balance arm is 2000~3000mm; there are two sling lugs on the balance arm, one of which is set near the outer end of the balance arm; the other is at a distance from the balance arm The distance between the outer ends is 800~1000mm. 10. The construction method of the super-high horn-shaped steel structure exterior construction platform according to claim 8, characterized in that: comprising the following steps: Make the main beam; First use Ф168*6 seamless steel pipe to make the upper and lower chords of the truss, use Ф102×5 seamless steel pipe to make the web of the truss, and use the truss as the main beam, and the total length of the main beam is ≤10 meters; The number of main girders is determined according to the diameter of the cross-section of the super-high horn-shaped steel structure. It must be ensured that during installation, each main girder is set along the radius direction of the circle where the cross-section of the super-high horn-shaped steel structure is located. Make a circle around the super-high trumpet-shaped steel structure; then, connect the U-shaped mounting plate on the end of the main girder; Make the hoop according to the diameter of the steel column on the super-high trumpet-shaped steel structure; There are steel columns on the super-high trumpet-shaped steel structure. When making the hoop, it is necessary to ensure that the hoop can cover the steel column; The number of hoops is equal to the number of main girders; The ear plate is welded at the center of the outer arc surface of the hoop, and the hoop and the steel column on the super-high trumpet-shaped steel structure are fixed by high-strength bolts; Make cables and rings; Set the outer cable on the main beam at a distance of 800~1000mm from the outer end of the main beam, and set the inner cable on the main beam at a distance of 1/5~3/5 of the total length of the main beam from the outer end of the main beam; make a balance beam; The balance arm is made of Ф168*6 seamless steel pipe, the counterweight is set on the outer end of the balance arm, and the hanging rope lug is set on the balance arm; Install the main girder, First, install the lifting rope: tie the balance beam and the main beam together, and hang the lifting rope on the two lifting lugs of the balance beam; because the balance arm and the main beam are bound together, and the lifting lugs are on the balance beam When the balance beam and the main beam are bound, it is necessary to ensure that the two hoisting ropes are respectively located on the outer end of the main beam and 800mm~1000mm away from the outer end of the main beam; at the same time, the auxiliary sling is hoisted on the balance beam. The length of the auxiliary sling is 1.5 times the length of the hoisting rope, and the hoisting point of the auxiliary sling is on the counterweight; connect the hoisting rope and the auxiliary hoisting rope to the lifting device; Then, open the lifting device; under the action of the lifting device, the main beam reaches the set position, install the outer cable at the outer end of the main beam, and install the inner cable at the inner side of the outer cable, where the distance between the inner cable and the outer end of the main beam is the main 1/5~3/5 of the total length of the beam; adjust the inner cable to a tensioned state, and adjust the outer cable to a relaxed state; Then, fix the mounting plate on the main beam and the ear plate on the hoop with pressure-bearing high-strength bolts; Finally, remove the balance beam and the main beam, and then adjust the outer cables to a tensioned state; lift the balance beam to the ground through the hoisting device; Install the secondary beam, First, the full penetration butt welded connecting plate on the main beam; Then, use the lifting device to hoist the H-shaped steel to the main beam, and use two high-strength bolts on each connecting plate to connect the connecting plate and the H-shaped steel together to realize the installation of the secondary beam; Repeat steps e and f in turn until all main beams and secondary beams are installed at the front; The construction panels are covered with pine springboards; First, spread the pine springboard with a thickness of 30~50mm on the main beam and the secondary beam to ensure that the connection of the two pine springboards is on the H-shaped steel; Then, use bolts to connect the H-shaped steel and the pine plank; Install the protective net, First, install the cantilevered channel steel on the cantilevered part to ensure that there is a cantilevered channel steel above each main girder, and the length of the cantilevered channel steel is ≤ 4 meters; Subsequently, connect vertical steel wire ropes between the cantilevered channel steel and the main girder, and the distance between adjacent vertical steel wire ropes is less than 2000mm; 1500mm; the place where the horizontal steel wire rope and the vertical steel wire rope meet is connected by iron wire, and a steel wire mesh is formed under the action of the vertical steel wire rope and the horizontal steel wire rope; Finally, set safety guardrails, dense mesh safety nets and safety flat nets in sequence from the inside to the outside of the steel wire mesh. The dense mesh safety nets and safety flat nets are fixed on the steel wire mesh, and the safety guardrails are fixed at the edge of the main beam, and the height of the safety guardrails 1.3~1.7mm.