CN219368722U

CN219368722U - Fixing device of strain sensor in bridge monitoring

Info

Publication number: CN219368722U
Application number: CN202320423020.4U
Authority: CN
Inventors: 李晓凯; 吉亚庆; 杜兆金
Original assignee: Jiangsu Testing Center For Quality Of Construction Engineering Co ltd
Current assignee: Jiangsu Testing Center For Quality Of Construction Engineering Co ltd
Priority date: 2023-03-08
Filing date: 2023-03-08
Publication date: 2023-07-18
Anticipated expiration: 2033-03-08

Abstract

The utility model discloses a fixing device of a strain sensor in bridge monitoring, which comprises an L-shaped connector, a support rod and a protection box, wherein a circular through hole is formed in the side wall of the protection box; the fixing and protecting device for the strain sensor is beneficial to solving the difficult problem of difficult monitoring of the internal temperature or strain of the concrete of the bottom plate of the large-span box-type bridge structure, and the sensor is not easy to deviate in direction and is reliably and fixedly installed.

Description

Fixing device of strain sensor in bridge monitoring

Technical Field

The utility model belongs to the field of engineering monitoring, and particularly relates to a fixing device of a strain sensor in bridge monitoring.

Background

Today, the bridge construction process in China is gradually changed, and the bridge span is continuously increased. In the bridge construction process, bridge monitoring personnel can guide on-site construction operation by controlling the stress of the key cross section of the bridge, namely: the change of the internal strain of the key section of the bridge under different construction working conditions is monitored by a strain sensor pre-embedded in the key section (such as a 0# block) of the bridge; whether the actual measurement strain data in the bridge concrete is within a safety range or not is analyzed to guide the site construction operation, so that accidents such as uneven stress, inclination or cracking of the bridge concrete and the like are prevented in the construction process of the bridge.

In the past, because the base plate of a set strain area (0 # block) of a large-span bridge is thicker, more reinforcing bars are arranged, and the gaps between the reinforcing bars are smaller. Therefore, when the strain sensor is installed, a field monitoring person is generally required to drill into the steel reinforcement framework of the bottom plate to perform operation, and the strain sensor is generally directly bound on the longitudinal steel reinforcement of the bottom plate by steel binding wires. The strain sensor is easily damaged in subsequent field worker operations (such as binding other reinforcing steel bars, concreting and vibrating, and the like), so that the deflection of the sensor direction, the breakage of a measuring and reading wire, and the like are caused. Once the strain sensor is broken, the sensor cannot be reinstalled at this critical section for remediation. The loss of the strain data of the key section for guiding the bridge construction can lead to the lack of support of the strain data for safety early warning in the construction process of the bridge. A strain sensor mounting method for bridge monitoring is employed herein to address this problem.

Disclosure of Invention

The utility model aims to solve the technical problem of a fixed protection device of a strain sensor, which is suitable for monitoring the internal strain of concrete, in particular to monitoring the internal temperature or strain of the bottom plate concrete of a large-span box girder bridge structure.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides a fixing device of strain sensor in bridge control, includes connector, bracing piece and the protection box of "L" type, the protection box lateral wall is provided with circular through-hole, is provided with strain sensor in the protection box, and the one end and the bracing piece of the connector of "L" type are connected, and the connector of "L" type passes through circular through-hole to be connected with the protection box lateral wall, connector, bracing piece and protection box three UNICOM, and strain sensor's survey reading wire is through circular through-hole, and the connector and the bracing piece of "L" type are extended to control terminal always.

The utility model discloses a fixing device of a strain sensor in bridge monitoring, wherein threads are arranged at two ends of an L-shaped connector, threads are also arranged at two ends of a supporting rod, and the L-shaped connector and the supporting rod are detachably connected through the threads.

By the above arrangement: the support rod is integrated into zero through threaded connection, so that on one hand, the long rod can be changed into a plurality of short rods, storage and carrying are convenient, and on the other hand, the support rod can be used repeatedly through detachable connection.

The utility model discloses a fixing device of a strain sensor in bridge monitoring, which also comprises a fixing support of the sensor, wherein a clamping groove is formed in the bottom of a protection box, the fixing support is fixedly arranged in the clamping groove, and the strain sensor is arranged on the fixing support.

By the above arrangement: the strain sensor can be further fixed due to the arrangement of the fixing support and the clamping groove, so that the strain sensor cannot be damaged due to the fact that the strain sensor is impacted against the protection box in the shaking process.

The utility model discloses a fixing device of a strain sensor in bridge monitoring, wherein support rods are made of segmented steel pipes, the length of each segment is 30-50 cm, and each segment of support rods is detachably connected by threads.

The utility model discloses a fixing device of a strain sensor in bridge monitoring.

By the above arrangement: the fixed side lug is used for fixing the protection box, through the side lug, the bolt connection or the pin connection can be adopted in a punching mode, and the sponge can be directly welded on the steel bar frame through the side lug, so that the stress of the protection box is reduced, the protection effect is achieved, and the protection box lacking elasticity is prevented from being damaged.

Compared with the prior art, the scheme of the utility model has the following beneficial effects:

the fixing and protecting device for the strain sensor is beneficial to solving the difficult problem of difficult monitoring of the internal temperature or strain of the concrete of the bottom plate of the large-span box-type bridge structure, and the sensor is not easy to deviate in direction and is reliably and fixedly installed.

The use of the protection box reduces the damage rate of the sensor, ensures that the sensor reading can accurately reflect the actual temperature and strain change in the concrete in the casting process and after solidification.

The support rod is simple in structure and convenient to assemble, can effectively protect the sensor reading wire, and has high application and popularization values.

The utility model will be described in more detail below with reference to the drawings and examples.

Drawings

The contents and the marks in the drawings expressed in the drawings of the present specification are briefly described as follows:

FIG. 1 is a schematic illustration of the present utility model;

FIG. 2 is a schematic view of a strain sensor installation of the present utility model;

FIG. 3 is a schematic view showing the internal structure of the fixed protection box of the present utility model;

FIG. 4 is a schematic view of the external structure of the fixed protection box of the present utility model;

FIG. 5 is a schematic diagram showing the connection of the support bar and the L-shaped connector according to the present utility model;

marked in the figure as: 1. the strain sensor comprises a strain sensor body, a measuring and reading wire, a protective box, a clamping groove, a connector, a support rod, a circular through hole, a fixing side lug, a thread and a clamping groove.

Detailed Description

The following detailed description of the embodiments of the present utility model, such as the shape and construction of the components, the mutual positions and connection relationships between the components, the roles and working principles of the components, the manufacturing process and the operation and use method, etc., will be given by way of example only to assist those skilled in the art in a more complete, accurate and thorough understanding of the present utility model.

The utility model provides a fixing device of strain sensor in bridge control, connector 5, bracing piece 6 and the protection box of "L" type, protection box 3 lateral wall is provided with circular through-hole 7, be provided with strain sensor 1 in the protection box 3, the one end and the bracing piece 6 of connector 5 of "L" type are connected, connector 5 of "L" type is connected with protection box 3 lateral wall through circular through-hole 7, connector 5, bracing piece 6 and protection box 3 three UNICOM, strain sensor 1's survey and read wire 2 is through circular through-hole, "L" connector and bracing piece and extend to control terminal all the time.

As shown in fig. 5, the two ends of the L-shaped connector 5 are provided with threads 9, the two ends of the support rod 6 are also provided with threads 9, and the L-shaped connector 5 and the support rod are detachably connected through the threads 9.

As shown in fig. 2 and 3, the sensor further comprises a fixing support of the sensor, the bottom of the protection box 3 is provided with a clamping groove 4, the fixing support is fixedly arranged in the clamping groove 4, and the strain sensor 1 is arranged on the fixing support.

The supporting rods 5 are made of segmented steel pipes, the length of each segment is between 30cm and 50cm, and the supporting rods of each segment are detachably connected through threads 9.

The outer wall of the protection box 3 shown in fig. 4 is provided with a fixed side lug 8, and the outer wall of the protection box 3 is also wrapped with sponge.

Working principle and method

Referring to fig. 1 to 5, the strain sensor fixing apparatus according to the present utility model is performed as follows:

1. and referring to a bridge design drawing, and determining the height dimension of the box girder in the strain area to be detected.

2. As shown in fig. 5, the field installer movably installs the L-shaped connector 5 on the preformed hole 7 of the fixed protection box 3

3. As shown in fig. 1, a field installer passes the sensing wire 2 of the strain sensor 1 through the L-shaped connector 5 from the inside.

4. As shown in fig. 4, the field installer directly installs and fixes the strain sensor 1 on the clamping groove 4 of the protection box 3.

5. As shown in fig. 4, a field installer assembles the protective case 3 by securing the side ears 8.

6. Referring to fig. 1, the sensing and reading wire 2 of the strain sensor 1 passes through the support rod 5 from the inside, the L-shaped connector 5 is connected with the support rod 6 by using a threaded 7 connection mode, and finally the end of the sensing and reading wire 2 is fixed at the end of the support rod 6.

8. The field monitoring personnel should insert the support rod 6 provided with the strain sensor 1 into the steel reinforcement framework of the area to be tested, wherein the protection box 3 should be ensured along the stress direction of the bridge structure (generally the longitudinal bridge direction of the bridge).

9. The ends of the support rods 6 with determined directions are welded on the side reinforcement cage for fixing.

10. The support bar 6 is preferably assembled to a length of 30cm above the reinforcement cage as shown in fig. 5 to prevent the wire ends from being buried in the concrete surface to be poured.

Note that: in the step 8, the L-shaped connector 5 is adjusted firstly to ensure that the strain sensor 1 can be welded with the end of the support rod 6 along the stress direction of the component when the reinforcement cage-shaped support rod 6 is inserted.

While the utility model has been described above with reference to the accompanying drawings, it will be apparent that the utility model is not limited to the above embodiments, but is capable of being modified or applied directly to other applications without modification, as long as various insubstantial modifications of the method concept and technical solution of the utility model are adopted, all within the scope of the utility model.

Claims

1. The utility model provides a fixing device of strain sensor in bridge control, includes connector, bracing piece and the protection box of "L" type, its characterized in that, the protection box lateral wall is provided with circular through-hole, is provided with strain sensor in the protection box, and the one end and the bracing piece of connector of "L" type are connected, and the connector of "L" type is connected with the protection box lateral wall through circular through-hole, connector, bracing piece and protection box three UNICOM, and strain sensor's survey reading wire is through circular through-hole, and the connector and the bracing piece of "L" type are prolonged to control terminal all the time.

2. The fixing device for a strain sensor in bridge monitoring according to claim 1, wherein the two ends of the L-shaped connector are provided with threads, the two ends of the supporting rod are also provided with threads, and the L-shaped connector is detachably connected with the supporting rod through threads.

3. The device for fixing the strain sensor in the bridge monitoring according to claim 1, further comprising a fixing bracket of the sensor, wherein a clamping groove is formed in the bottom of the protection box, the fixing bracket is fixedly arranged in the clamping groove, and the strain sensor is arranged on the fixing bracket.

4. The device for fixing a strain sensor in bridge monitoring according to claim 2, wherein the support rods are made of segmented steel pipes, the length of each segment is between 30cm and 50cm, and the support rods of each segment are detachably connected through threads.

5. The device for fixing the strain sensor in the bridge monitoring according to claim 1, wherein the outer wall of the protection box is provided with a fixing side lug, and the outer wall of the protection box is further wrapped with a sponge.