CN105928642B - A kind of removable sleeve formula force snesor for supporting structure - Google Patents

Abstract

The invention relates to a detachable sleeve type force sensor used for a bracket structure, which belongs to the field of sensor technology. The invention proposes a detachable sleeve-type force sensor for a support structure, which can monitor the axial pressure of the vertical rod of the support structure, and can be disassembled and reused, thereby improving the utilization rate and use value of the sensor. Utilizing the detachable sleeve-type force sensor developed for the support structure, combined with wireless sensor network technology, the developed sensors are distributed on the support structure site, which can realize the monitoring of the force of the support structure vertical rod, and the installed sensors It can be removed at any time when the support structure is in working condition, has high monitoring efficiency, and has great application value and potential.

Description

A detachable sleeve type force sensor for bracket structure

technical field

The invention relates to a detachable sleeve-type force sensor for a support structure, which belongs to the field of sensor technology, can monitor the axial pressure of a vertical rod of a support structure, is detachable and reusable, and has high monitoring efficiency.

Background technique

With the implementation of the "Belt and Road" strategy, my country's road and bridge construction has developed rapidly. Cast-in-place box girder formwork support is widely used in practical engineering as a commonly used support structure in road and bridge construction. The cast-in-place box girder formwork support has the advantages of low cost, simple structure, high bearing capacity, and convenient erection. In the construction process of cast-in-place concrete continuous box girder, the formwork support structure plays an irreplaceable role in ensuring the construction progress and solving construction problems.

The construction support is a temporary structure, and it is also the main support structure in the construction of the support cast-in-place method. The strength, stiffness, stability and deformation of the support directly affect the quality and safety of the bridge. For a long time, the design of the support has not attracted people's attention, and in most cases it is erected according to the experience of the construction personnel. It is precisely because the support has the characteristics of various erection methods, many uncertain factors, large load, and incomplete calculation theory, etc., a quarter of the construction accidents are related to the failure of the support, which has caused great harm to the country and people's lives and property. Big loss.

With the rapid development of the application of support structures, the collapse accidents caused by the instability of support structures have also become an increasing trend year by year. In recent years, major engineering accidents such as the collapse of brackets and formwork support frames during bridge construction have occurred many times in some areas, causing painful casualties and huge property losses.

Quality is the life of a project, and in-service test monitoring is an important means of project quality management. Strengthening the quality monitoring of support structures in the construction process of roads and bridges, and giving full play to their important role in construction safety and quality control and evaluation, has become an important content of comprehensive quality and safety supervision of road and bridge projects. At present, the means of construction supervision, in-service monitoring, and detection of support structures in China are extremely limited. The traditional monitoring method is to obtain the force of the support structure poles by pasting strain gauges on the support structure poles. The film work is cumbersome, the paste quality has a great influence on the monitoring results, and the detection efficiency is low. In order to improve the traditional monitoring method of the bracket structure, save the work of pasting strain gauges on site, and improve the monitoring efficiency, the present invention designs a detachable sleeve-type force sensor for the bracket structure, which has the advantages of detachability and repeated use. It can monitor the force status of the vertical rod of the support structure, eliminating the need to paste strain gauges on the support site.

The working principles of force sensors mainly include resistance strain type, differential transformer type, capacitive type, piezomagnetic type, piezoelectric type and vibrating wire type. Among them, the resistance strain sensor is a type of sensor that is widely used at present, and is favored by various industries for its advantages such as wide measurement range, stable performance, and good frequency response characteristics. The resistance strain type force sensor is mainly based on the principle that the elastic body (elastic element) produces elastic deformation under the action of external force, so that the resistance strain gauge (conversion element) pasted on the surface is also deformed. After the resistance strain gauge is deformed, its The resistance value will change, and then the corresponding measurement circuit (Huygens bridge) converts this resistance change into an electrical signal (voltage or current), thereby completing the process of converting external force into an electrical signal. At present, there are few reports on detachable sleeve-type force sensors that use the principle of resistance strain and are specially designed for the special structure of the stent structure.

Contents of the invention

The present invention aims to design a detachable sleeve-type force sensor for a bracket structure, which has the advantages of detachability and repeated use. The resistance strain sensor is used to monitor the axial pressure of the support structure, analyze the stability of the support structure, and ensure the smooth progress of bridge construction.

To achieve the above object, the present invention adopts the following design scheme:

Detachable sleeve-type force sensor for bracket structure, including horn screw 1, horn nut 2, first baffle plate 3, first protective shell 4, side fastening screw a5, side fastening screw b7, side Fastening screw c10, side fastening screw d11, side fastening screw e14, side fastening screw f15, side fastening screw g16, side fastening screw h17, first elastic element 6, hinge 8, The first fixed joint 9, the second baffle plate 12, the second elastic element 13, the second fixed joint 18, the third baffle plate 19, the fourth baffle plate 20, the first semi-circular ring 21, the second semi-circular ring 22, The second protective shell 23, the fourth baffle fixing screw a24, the fourth baffle fixing screw b27, the hinge fixing screw a25, the hinge fixing screw b26, the hinge fixing screw c33, the hinge fixing screw d34, the first baffle Fixing screw a28, first baffle fixing screw b29, second baffle fixing screw a30, second baffle fixing screw b31, third baffle fixing screw a32, third baffle fixing screw b35, first resistance strain gauge 36 , the second strain gauge 37 .

The first and second lobe of the sensor are symmetrical structures. The first elastic element 6 is nested in the first protective shell 4 , and the second elastic element 13 is nested in the second protective shell 23 . The space between the first elastic element 6 and the first protective shell 4 is filled by a first semicircular ring 21 . The space between the second elastic element 13 and the second protective shell 23 is filled by the second semicircular ring 22 . The first elastic element 6 and the first protective shell 4 are fixedly connected by the side fastening screws a5 and the side fastening screws b7. The second elastic element 13 and the second protective shell 23 are fixedly connected by side fastening screws e14 and side fastening screws g16. The first protective shell 4 and the first semicircular ring are fixedly connected by side fastening screws c10 and side fastening screws d11 . The second protective shell 23 and the second semicircular ring 22 are fixedly connected by side fastening screws f15 and side fastening screws h17. The first baffle 3 and the first elastic element 6 are fixedly connected by the first baffle fixing screw a28. The first baffle 3 is fixedly connected to the first semicircular ring 21 by the first baffle fixing screw b29. The second baffle 12 is fixedly connected to the second elastic member 13 by the second baffle fastening screw b31. The second baffle 12 is fixedly connected to the second semi-circular ring 22 by the second baffle fixing screw a30. The third baffle 19 is fixedly connected to the second elastic member 13 by the third baffle fixing screw a32. The third baffle 19 is fixedly connected to the second semi-circular ring 22 by the third baffle fixing screw b35. The fourth baffle 20 is fixedly connected to the first elastic element 6 by the fourth baffle fastening screw b27. The fourth baffle 20 is fixedly connected to the first semicircular ring 21 by the fourth baffle fastening screw a24. The third baffle 19 and the hinge 8 are fixedly connected by hinge fastening screws c33 and hinge fastening screws d34. The fourth baffle 20 and the hinge 8 are fixedly connected by hinge fastening screws a25 and hinge fastening screws b26. The first baffle 3 and the second baffle 12 are connected by claw screws 1 and claw nuts 2 .

The first strain gauge 36 is glued to the outside of the first elastic element 6, the second strain gauge 37 is glued to the outside of the second elastic element 13, and the first strain gauge 36 and the second strain gauge 37 are distributed symmetrically. . The first resistance strain gauge 36 and the second resistance strain gauge 37 are both half-bridge strain gauges, and the two half-bridge strain gauges form a Wheatstone full-bridge circuit, which is used to sense the deformation of the elastic element and effectively eliminate the bending moment Impact.

The first elastic element 6 and the second elastic element 13 are made of high-strength alloy structural steel 40CrNiMoA, which has high tensile strength and yield strength. The shape of the elastic element is designed as a sleeve, which can monitor the force of the vertical rod of the support structure.

The first fixed joint 9 and the second fixed joint 18 are fixedly connected with the first protective shell 4 and the second protective shell 23 respectively by threaded fit, which can effectively protect the electric resistance drawn from the first strain gauge 36 and the second strain gauge 37. wire.

Compared with the prior art, the present invention has the following beneficial effects:

1. The inside of the sensor connects the two sensors together through the hinge 8, and assembles them together through the horn screw 1 and the horn nut 2. By adopting the detachable sleeve structure, the sensor can be removed at any time when the support structure is in working condition, which avoids the difficulty of dismantling the support to remove the sensor, and improves the monitoring efficiency and reusability of the sensor.

2. The elastic element 6 and the elastic element 13 are made of high-strength alloy structural steel, which can reduce the size of the sensor. The protective shell 4 and the protective shell 43 are made of aluminum alloy, which can reduce the weight of the sensor. The sensor has the advantages of portability and easy installation.

3. The lead screw nut 41 is enclosed by the sensor 40, and is used to adjust the stressed state and the non-stressed state of the sensor, and can switch the working and non-working states of the sensor, which is convenient to use.

4. The sensor forms a sleeve-type structure when it works. The top layer of the sleeve is a two-layer step type, which can realize the monitoring of the vertical rod force of the two specifications of the door-type steel pipe scaffolding and the bowl-buckle steel pipe scaffolding. The bracket structure pole has versatility.

Description of drawings

Figure 1 is the overall front view of the detachable sleeve type force sensor used in the bracket structure;

Figure 2 is the overall top view of the detachable sleeve type force sensor used in the bracket structure;

Figure 3 is the overall bottom view of the detachable sleeve type force sensor used for the bracket structure;

Fig. 4 Bottom view of the first petal of the detachable sleeve-type force sensor used in the stent structure;

Fig. 5 Front view of the first petal of the detachable sleeve-type force sensor used in the stent structure;

Figure 6. Top view of the first petal of the detachable sleeve-type force sensor used in the stent structure;

Figure 7 is a bottom view of the second petal of the detachable sleeve-type force sensor used in the stent structure;

Figure 8 is a front view of the second petal of the detachable sleeve-type force sensor used in the stent structure;

Figure 9 is a top view of the second petal of the detachable sleeve-type force sensor used in the stent structure;

Figure 10 is a schematic diagram of sticking strain gauges in a detachable sleeve-type force sensor for a stent structure;

Figure 11 is a schematic diagram of installation of a detachable sleeve-type force sensor for a bracket structure;

Figure 12 is a schematic diagram of the disassembly of the detachable sleeve type force sensor for the bracket structure;

In the figure: 1, horn screw, 2, horn nut, 3, the first baffle plate, 4, the first protective shell, 5, side fastening screw a, 7, side fastening screw b, 10, side tight Fastening screw c, 11, side fastening screw d, 14, side fastening screw e, 15, side fastening screw f, 16, side fastening screw g, 17, side fastening screw h, 6 , the first elastic element, 8, the hinge, 9, the first fixed joint, 12, the second baffle, 13, the second elastic element, 18, the second fixed joint, 19, the third baffle, 20, the fourth Baffle, 21, the first semi-circular ring, 22, the second semi-circular ring, 23, the second protective shell, 24, the fourth baffle plate fixing screw a, 27, the fourth baffle plate fixing screw b, 25, hinge Fixing screw a, 26, hinge fixing screw b, 33, hinge fixing screw c, 34, hinge fixing screw d, 28, first baffle fixing screw a, 29, first baffle fixing screw b, 30, The second baffle fixing screw a, 31, the second baffle fixing screw b, 32, the third baffle fixing screw a, 35, the third baffle fixing screw b, 36, the first resistance strain gauge, 37, the second Resistance strain gauge, 38, leading screw base, 39, the first leading screw nut, 40, sensor, 41, the second leading screw nut, 42, gasket, 43, steel pipe.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and examples, and the following examples are only descriptive and not restrictive, and cannot be used to limit the protection scope of the present invention.

Figures 1, 2 and 3 are structural views of the detachable sleeve-type force sensor used in the stent structure of the present invention. The first elastic element 6 and the second elastic element 13 are made of high-strength alloy structural steel 40CrNiMoA, which has high tensile strength and yield strength. The shape of the elastic element is sleeve type, the top layer is designed as a double-layer step type, and the inner diameters of the two steps are designed to be 49mm and 58mm respectively. The fit between the sensor and the two scaffold steel pipes is a small interference fit. The first protective shell 4 and the second protective shell 23 are made of lightweight 5052 aluminum alloy, which reduces the manufacturing difficulty and improves the working life of the sensor while meeting the requirements of protecting the elastic element.

As shown in Figure 1, the wires of the first strain gauge 36 and the second strain gauge 37 are drawn out through the first fixed joint 9 and the second fixed joint 18 respectively, and there are 5 lead wires of different colors in the wires, which are respectively the positive power line and the negative power line. Power wire, positive signal wire, negative signal wire and ground wire.

As shown in Fig. 11 and Fig. 12, the installation situation of sensor is as follows: first sensor 40 is installed on the first lead screw nut 39 of support structure base, then the second lead screw nut 41 is installed on sensor 40, then put The gasket 42 is installed on the two steps of the sensor 40 , and the gasket 42 is not in contact with the second lead screw nut 41 , and finally the support steel pipe 43 is installed on the two steps of the gasket 42 . The inner walls of the sensor 40, the gasket 42 and the support steel pipe 43 are not in any contact with the lead screw 38, and the pressure on the support steel pipe is transmitted to the sensor through the gasket. The wire of the sensor is externally connected to a transmitter and an intelligent display commonly used in the industry, which are used to monitor and display the pressure of the vertical pole in the support structure.

After the monitoring is completed, rotate the second lead screw nut 41 counterclockwise to raise the second lead screw nut 41, causing the lead screw nut 41 to contact the washer 42, so that the load on the steel pipe 43 is transmitted to the second lead screw nut through the washer. Bar nut 41, and sensor 40 is no longer stressed. Then rotate the first lead screw nut 39 clockwise, the first lead screw nut 39 descends, move the sensor 40 downward, separate the sensor 40 from the gasket 42, remove the claw nut 2, remove the claw screw 1, and open the sensor 40, Take off from leading screw 38 tops, just can complete the dismounting work of sensor.

Claims (4)

1. A detachable sleeve-type force sensor for a support structure, characterized in that: the sensor comprises a claw screw (1), a claw nut (2), a first baffle plate (3), a first protective shell (4 ), side fastening screw a (5), side fastening screw b (7), side fastening screw c (10), side fastening screw d (11), side fastening screw e (14 ), side fastening screw f (15), side fastening screw g (16), side fastening screw h (17), first elastic element (6), hinge (8), first fixed joint (9), the second baffle (12), the second elastic element (13), the second fixed joint (18), the third baffle (19), the fourth baffle (20), the first half ring ( 21), the second semi-circular ring (22), the second protective shell (23), the fourth baffle fixing screw a (24), the fourth baffle fixing screw b (27), the hinge fixing screw a (25) , Hinge fixing screw b(26), hinge fixing screw c(33), hinge fixing screw d(34), first baffle fixing screw a(28), first baffle fixing screw b(29), The second baffle fixing screw a (30), the second baffle fixing screw b (31), the third baffle fixing screw a (32), the third baffle fixing screw b (35), the first resistance strain gauge ( 36), the second resistance strain gauge (37); The first petal and the second petal of the sensor are symmetrical structures; the first elastic element (6) is nested in the first protective shell (4), and the second elastic element (13) is nested in the second protective shell (23) ; between the first elastic element (6) and the first protective shell (4) is filled by the first semicircular ring (21); between the second elastic element (13) and the second protective shell (23) by the second half The ring (22) is filled; the first elastic element (6) and the first protective shell (4) are fixedly connected by the side fastening screw a (5) and the side fastening screw b (7); the second elastic The element (13) and the second protective shell (23) are fixedly connected by the side fastening screw e (14) and the side fastening screw g (16); the first protective shell (4) and the first half ring They are fixedly connected by side fastening screws c (10) and side fastening screws d (11); between the second protective shell (23) and the second semicircular ring (22) by side fastening screws f (15), the side fastening screw h (17) is fixed; the first baffle (3) and the first elastic element (6) are fixedly connected by the first baffle fixing screw a (28); the first baffle The plate (3) and the first semicircular ring (21) are fixedly connected by the first baffle fixing screw b (29); the second baffle (12) and the second elastic element (13) are connected by the second baffle The plate fastening screw b (31) is fixedly connected; the second baffle plate (12) and the second semi-circular ring (22) are fixedly connected by the second baffle plate fixing screw a (30); the third baffle plate (19) It is fixedly connected with the second elastic element (13) by the third baffle fixing screw a (32); between the third baffle (19) and the second semi-circular ring (22) is fixed by the third baffle fixing screw b (35) fixed connection; the fourth baffle plate (20) and the first elastic element (6) are fixedly connected by the fourth baffle plate fastening screw b (27); the fourth baffle plate (20) and the first semicircle The rings (21) are fixedly connected by the fourth baffle fastening screw a (24); the third baffle (19) and the hinge (8) are connected by the hinge fastening screw c (33), the hinge The fixing screw d (34) is fixedly connected; the fourth baffle (20) and the hinge (8) are fixedly connected by the hinge fixing screw a (25) and the hinge fixing screw b (26); the first baffle ( 3) It is connected with the second baffle plate (12) by horn screws (1) and horn nuts (2); The first fixed joint (9) and the second fixed joint (18) are fixedly connected with the first protective shell (4) and the second protective shell (23) respectively by threaded fit, which can effectively protect the resistance from the first strain gauge (36) ) and the wires that the second strain gauge (37) leads out. 2. A detachable sleeve type force sensor for a stent structure according to claim 1, characterized in that: the first resistance strain gauge (36) is pasted on the outside of the first elastic element (6) by glue, and the second Two resistance strain gauges (37) are pasted on the outside of the second elastic element (13) by glue, and the first resistance strain gauge (36) and the second resistance strain gauge (37) are symmetrically distributed; the first resistance strain gauge (36) and The second resistance strain gauges (37) are all half-bridge strain gauges, and the two half-bridge strain gauges form a Wheatstone full-bridge circuit for sensing the deformation of the elastic element and effectively eliminating the influence of bending moment. 3. A detachable sleeve-type force sensor for a stent structure according to claim 1, characterized in that: the first elastic element (6) and the second elastic element (13) adopt high-strength metal materials; The shape of the elastic element is a sleeve type, and the top layer is designed as a double-layer step; the first protective shell (4) and the second protective shell (23) are made of light alloy materials; the cooperation between the sensor and the two kinds of scaffold steel pipes is a small interference fit The wires of the first resistance strain gauge (36) and the second resistance strain gauge (37) are respectively passed through the first fixed joint (9), and the second fixed joint (18) is drawn, and the lead wires of five different colors in total in the wire are respectively Positive power wire, negative power wire, positive signal wire, negative signal wire and ground wire. 4. A kind of detachable sleeve type force sensor for support structure according to claim 3, it is characterized in that: the installation situation of sensor is as follows: at first sensor (40) is installed on the first leading screw of support structure base nut (39), then install the second lead screw nut (41) on the sensor (40), then install the washer (42) on the two steps of the sensor (40), and ensure that the washer (42) Not in contact with the second lead screw nut (41), finally the bracket steel pipe (43) is installed on the two-layer step of the gasket (42); the inner wall of the sensor (40), gasket (42) and bracket steel pipe (43) without any contact with the lead screw (38), the pressure on the steel pipe of the support is transmitted to the sensor through the gasket; the wire of the sensor is externally connected to a transmitter and an intelligent display commonly used in the industry, which are used to monitor and display the neutral pole of the support structure pressure; After the monitoring is completed, rotate the second lead screw nut (41) counterclockwise to make the second lead screw nut (41) rise, causing the second lead screw nut (41) to contact the gasket (42), so that the bracket steel pipe ( The load on 43) is transmitted to the second lead screw nut (41) through the gasket, and the sensor (40) is no longer stressed; then the first lead screw nut (39) is rotated clockwise, and the lead screw nut (39) descends, Move the sensor (40) downward to separate the sensor (40) from the washer (42), remove the claw nut (2), remove the claw screw (1), open the sensor (40), and open the sensor (40) from the top of the screw (38). Take it off to complete the disassembly work of the sensor.