Underanchor prestress monitoring device for box girder

Abstract

The utility model discloses an under-anchor prestress monitoring device for a box girder, and relates to the technical field of concrete bridge testing, the under-anchor prestress monitoring device comprises a box girder body, an anchor bearing plate, a gasket and a pressure sensor, a plurality of steel strands are arranged on the box girder body in a penetrating mode, and monitoring assemblies used for conducting prestress monitoring on the steel strands are arranged on the steel strands; the pressure sensor is fixedly connected to the side wall of one side of the gasket, the gasket is provided with a limiting assembly used for enabling the pressure sensor to be evenly stressed, and the limiting assembly comprises a plurality of fixing sleeves fixedly connected to the side wall of one side of the gasket. And then a fastening block is rotated to push a limiting ring, the limiting ring abuts against a fixing sleeve, a supporting rod is prevented from continuously sliding, a spring is prevented from being extruded, and the problems that the pressure sensor continuously extrudes the spring, and the spring is prone to fatigue damage and breakage when subjected to overlarge pressure for a long time are solved as much as possible.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of concrete bridge testing, in particular to an anchor-under prestress monitoring device for a box girder. BACKGROUND

[0002] Among the current bridges in the world, more than 70% adopt prestressed structures. The prestressed concrete technology has been very important in bridges. Anchor-under prestress refers to the effective tension prestress or operating prestress of a prestressed anchor cable construction. At present, the anchor cable construction quality is mainly detected by an anchor-out pulling test.

[0003] The utility model discloses a kind of concrete box girder anchor-under prestress monitoring devices, including pressure sensor, gasket and spring device;Wherein, pressure sensor is equipped with convex groove, gasket is equipped with recess;Convex groove and recess are mutually matched, pressure sensor is fixed on gasket, gasket is connected with anchor pad by spring device.

[0004] The anchor-under prestress monitoring device for a concrete box girder in the above, the gasket is connected with the anchor pad by the spring, solves the problem that the pressure sensor is unevenly stressed due to the unevenness of the anchor pad, but the jack applies prestress to the anchor, the pressure sensor continuously squeezes the spring, and the spring is prone to fatigue damage when subjected to excessive pressure for a long time, leading to breakage. UTILITY MODEL CONTENTS

[0005] The utility model discloses an anchor-under prestress monitoring device for a concrete box girder, which solves the problem that the pressure sensor is unevenly stressed due to the unevenness of the anchor pad by connecting the gasket with the anchor pad by the spring.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] An anchor-under prestress monitoring device for a box girder includes a box girder body, an anchor pad, a gasket and a pressure sensor. A plurality of steel strands are provided on the box girder body. A monitoring assembly for monitoring the prestress of the steel strands is provided on the steel strands. A limiting assembly for uniformly stressing the pressure sensor is provided on the gasket. The limiting assembly includes a plurality of fixed sleeves fixed to the side wall of the gasket. Springs are fixed in the fixed sleeves. Support rods are fixed to the other ends of the springs. A limiting ring is provided on the support rods. Fastening blocks are threadedly connected to the ends of the support rods away from the fixed sleeves.

[0008] By adopting the above technical scheme, when in use, the anchor pad plate, the gasket and the pressure sensor are sequentially sleeved on the steel strand, the anchor pad plate is fixedly installed on the box girder body through the external clamping piece, and then the monitoring assembly is installed on the steel strand, the gasket is pushed to be close to the anchor pad plate by the pressure sensor, prestress monitoring is performed, when the anchor pad plate is uneven, the plurality of supporting rods are sequentially in contact with the anchor pad plate through the spring, the pressure sensor is uniformly stressed, then the fastening block is rotated, the fastening block pushes the limiting ring, the limiting ring is abutted with the fixing sleeve, sliding of the supporting rod in the fixing sleeve is prevented, the spring is extruded, and continuous extrusion of the pressure sensor on the spring is avoided as much as possible. When the spring is subjected to excessive pressure for a long time, fatigue damage of the spring is prone to occur, and the problem of breakage is caused.

[0009] Optionally, the monitoring assembly comprises a jack installed on the steel strand, and the steel strand is installed with an anchorage device between the jack and the pressure sensor.

[0010] By adopting the above technical scheme, the jack is installed, the jack applies prestress to the anchorage device, and prestress monitoring is performed in cooperation with the pressure sensor.

[0011] Optionally, a ring-shaped block is fixedly connected to a side wall of the pressure sensor close to the gasket, and a ring-shaped groove that is matched with the ring-shaped block is formed in a side wall of the gasket.

[0012] By adopting the above technical scheme, the ring-shaped block is inserted into the ring-shaped groove, the pressure sensor is fixed on the gasket, and the stability of the pressure sensor is ensured and is not affected by construction.

[0013] Optionally, a plurality of limiting grooves are formed in the inner side wall of the fixing sleeve, and a plurality of limiting blocks that are matched with the limiting grooves are fixedly connected to an end side wall of the supporting rod in the fixing sleeve.

[0014] By adopting the above technical scheme, the limiting grooves and the limiting blocks can prevent the supporting rod from rotating in the fixing sleeve when the fastening block is rotated, twisting of the spring is caused, and the spring is damaged.

[0015] Optionally, a limiting rod is fixedly connected in the limiting groove, and the limiting block is sleeved on the limiting rod.

[0016] By adopting the above technical scheme, the limiting rod can improve the stability of the limiting block in the limiting groove, prevent the supporting rod from shaking when sliding in the fixing sleeve, and cause the spring to shake.

[0017] Optionally, the two side walls of the jack are fixedly connected with guide rods, the two side walls of the pressure sensor and the gasket are fixedly connected with guide blocks, and the ends of the guide rods away from the jack respectively penetrate the guide blocks and are slidably arranged.

[0018] By adopting the above technical scheme, when the jack is installed, the two guide rods penetrate the two guide blocks of the pressure sensor and the gasket side wall respectively, the pressure sensor and the gasket are coaxially arranged with the jack, and the annular block is conveniently inserted into the annular groove.

[0019] Optionally, the box girder body is provided with a data acquisition module, and the data acquisition module is electrically connected with the pressure sensor.

[0020] By adopting the above technical scheme, the data detected by the pressure sensor can be centrally arranged and analyzed through the data acquisition module, and the data acquisition module can alarm when the data exceeding the threshold value in the tensioning process, so that the construction quality is controllable.

[0021] In summary, the beneficial effects of the present application are as follows:

[0022] 1. The present application is provided by the cooperation of the fixed sleeve, the supporting rod and the limiting ring and other structures, in use, the anchor pad, the gasket and the pressure sensor are sequentially sleeved on the steel strand, the anchor pad is fixedly installed on the box girder body through the external clamping piece, and then the monitoring assembly is installed on the steel strand, the pressure sensor is pushed to make the gasket close to the anchor pad, prestress monitoring is performed, when the anchor pad is uneven, the multiple supporting rods are sequentially contacted with the anchor pad through the spring, the pressure sensor is uniformly stressed, then the fastening block is rotated, the limiting ring is pushed by the fastening block, the limiting ring is abutted with the fixed sleeve, the supporting rod is prevented from continuously sliding in the fixed sleeve, the spring is extruded, and the problem that the spring is easily damaged and broken due to long-time excessive pressure is avoided as much as possible;

[0023] 2. By the cooperation of the limiting groove and the limiting block, the supporting rod is prevented from rotating in the fixed sleeve when the fastening block is rotated, so that the spring is prevented from being twisted, and the stability of the limiting block in the limiting groove is improved through the limiting rod, so that the supporting rod is prevented from shaking when sliding in the fixed sleeve, the spring is prevented from shaking, and the spring is prevented from being damaged. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a whole structure schematic view of the utility model;

[0025] Figure 2 It is a gasket and fixed sleeve connecting structure schematic view of the utility model;

[0026] Figure 3The utility model discloses a fixed sleeve internal structure schematic view.

[0027] Figure 4 The utility model discloses a ring block structure schematic view.

[0028] The figure mark explains: 1, box beam body, 2, anchor backing plate, 3, washer, 4, pressure sensor, 5, steel strand, 6, fixed sleeve, 7, spring, 8, support rod, 9, limit ring, 10, fastening block, 11, jack, 12, anchor device, 13, ring block, 14, annular groove, 15, limit groove, 16, limit block, 17, limit rod, 18, guide rod, 19, guide block, 20, data acquisition module. Specific implementation

[0029] The following combines the attached Figures 1-4 Make further detailed explanation to the application.

[0030] Please refer to Figures 1-3 A box beam is used under the prestress monitoring device of anchor, including box beam body 1, anchor backing plate 2, washer 3 and pressure sensor 4, is equipped with a plurality of steel strand 5 on box beam body 1, anchor backing plate 2, washer 3 and pressure sensor 4 are sequentially set in steel strand 5 and anchor backing plate 2 is installed fixedly through the clamping piece with box beam body 1, is equipped with the monitoring assembly for the prestress monitoring of steel strand 5 on steel strand 5, is equipped with the limiting component for making pressure sensor 4 uniform stress on washer 3, and the limiting component includes fixed sleeve 6, spring 7, support rod 8, limit ring 9 and fastening block 10;

[0031] Fixed sleeve 6 is provided with a plurality of and is fixedly connected on the side wall of washer 3 near anchor backing plate 2 and forms annular array distribution, and the end of fixed sleeve 6 away from washer 3 is provided with an opening, spring 7 is provided with a plurality of respectively in fixed sleeve 6 and one end is fixedly connected with fixed sleeve 6, support rod 8 is provided with a plurality of and one end is slidably arranged in the fixed sleeve 6, and the end of support rod 8 in fixed sleeve 6 is fixedly connected with spring 7 respectively, limit ring 9 is set in a plurality of support rods 8 and one side wall is abutted with fixed sleeve 6, limit ring 9 is slidably arranged on support rod 8, so that support rod 8 can slide in fixed sleeve 6, fastening block 10 is provided with a plurality of and is respectively screwed on the end of support rod 8 away from fixed sleeve 6, so that support rod 8 all contacts anchor backing plate 2 after, limit ring 9 is extruded in the end of fixed sleeve 6, prevents support rod 8 from continuing to slide in fixed sleeve 6, and the spring 7 is continuously extruded, leading to the excessive pressure of spring 7.

[0032] In use, the anchor pad plate 2, the gasket 3 and the pressure sensor 4 are sequentially sleeved on the steel strand 5, the anchor pad plate 2 is fixedly installed on the box girder body 1 through the clamping piece, then the monitoring assembly is installed on the steel strand 5, the gasket 3 is pushed to be close to the anchor pad plate 2 by the pressure sensor 4, prestress monitoring is performed, when the anchor pad plate 2 is uneven, the plurality of supporting rods 8 are sequentially in contact with the anchor pad plate 2 through the spring 7, the pressure sensor 4 is uniformly stressed, then the fastening block 10 is rotated, the fastening block 10 pushes the limiting ring 9, the limiting ring 9 is abutted with the fixing sleeve 6, the supporting rod 8 is prevented from continuously sliding in the fixing sleeve 6, the spring 7 is extruded, and continuous extrusion of the pressure sensor 4 on the spring 7 is avoided as much as possible. When the spring 7 is subjected to excessive pressure for a long time, fatigue damage is prone to occur, and the spring 7 is prone to breakage.

[0033] With reference to Figure 1 , the monitoring assembly comprises a jack 11 installed on the steel strand 5, the jack 11 is a through-type jack 11, and the jack 11 is sleeved on the steel strand 5 for installation and fixation. The anchor device 12 is installed between the jack 11 and the pressure sensor 4. The jack 11 is installed to apply prestress to the anchor device 12, and the prestress is monitored in cooperation with the pressure sensor 4.

[0034] With reference to Figure 1 and Figure 4 , the annular block 13 is fixedly connected to the side wall of the side of the pressure sensor 4 close to the gasket 3, the annular groove 14 matched with the annular block 13 is formed in the side wall of the side of the gasket 3, the pressure sensor 4 is fixed on the gasket 3 by inserting the annular block 13 into the annular groove 14, and the stability of the pressure sensor 4 is ensured and is not affected by construction.

[0035] With reference to Figure 3 , a plurality of limiting grooves 15 are formed in the inner side wall of the fixing sleeve 6, the limiting grooves 15 are arranged in an annular array, the plurality of limiting blocks 16 are fixedly connected to the end side wall of the supporting rod 8 located in the fixing sleeve 6, and the limiting blocks 16 are respectively located in the limiting grooves 15 and are slidably arranged. Through cooperation of the limiting grooves 15 and the limiting blocks 16, when the fastening block 10 is rotated, the supporting rod 8 is prevented from rotating in the fixing sleeve 6, the spring 7 is prevented from being twisted, and the spring 7 is prevented from being damaged.

[0036] With reference to Figure 3 , the limiting rods 17 are fixedly connected in the limiting grooves 15, and the limiting blocks 16 are sleeved on the limiting rods 17. The limiting rods 17 can improve the stability of the limiting blocks 16 in the limiting grooves 15, prevent the supporting rod 8 from shaking when the supporting rod 8 slides in the fixing sleeve 6, and prevent the spring 7 from shaking.

[0037] With reference to Figure 1The two side walls of the pressure sensor 4 and the gasket 3 are fixedly connected with guide blocks 19, and the two guide rods 18 are respectively penetrated through the two guide blocks 19 of the side walls of the pressure sensor 4 and the gasket 3 and are formed in sliding arrangement, so that when the jack 11 is installed, the two guide rods 18 are respectively penetrated through the two guide blocks 19 of the side walls of the pressure sensor 4 and the gasket 3, the pressure sensor 4 and the gasket 3 are coaxially arranged with the jack 11, the annular block 13 is inserted into the annular groove 14, and the annular groove 14 and the annular block 13 are prevented from being difficult to align.

[0038] With reference to Figure 1 The box girder body 1 is provided with a data acquisition module 20, and the data acquisition module 20 is a prior art, so that the data acquisition module 20 is not described in detail here. The data acquisition module 20 is electrically connected with the pressure sensor 4, the data detected by the pressure sensor 4 can be centrally arranged and analyzed through the data acquisition module 20, and the data acquisition module 20 can alarm the data exceeding the threshold value in the tensioning process, so as to ensure that the construction quality is controllable.

[0039] The implementation principle of the present application is as follows: in use, the anchor pad 2, the gasket 3 and the pressure sensor 4 are sequentially sleeved on the steel strand 5, the anchor pad 2 is fixedly installed on the box girder body 1 through the clamping piece, then the jack 11 is installed, the two guide rods 18 are respectively penetrated through the two guide blocks 19 of the side walls of the pressure sensor 4 and the gasket 3, the pressure sensor 4 and the gasket 3 are coaxially arranged with the jack 11, then the jack 11 applies a prestress to the anchorage device 12, the pressure sensor 4 is pushed to make the gasket 3 close to the anchor pad 2 for prestress monitoring, at the same time, the annular block 13 is inserted into the annular groove 14, the pressure sensor 4 is fixed on the gasket 3, the stability of the pressure sensor 4 is ensured, when the anchor pad 2 is uneven, the plurality of supporting rods 8 are sequentially contacted with the anchor pad 2 through the spring 7, after the supporting rods 8 are all contacted with the anchor pad 2, the limiting ring 9 is abutted with the fixed sleeve 6 by rotating the fastening block 10 to push the limiting ring 9, the limiting ring 9 is prevented from continuously sliding in the fixed sleeve 6, the spring 7 is extruded at the same time, the pressure sensor 4 is uniformly stressed, and the continuous extrusion of the pressure sensor 4 on the spring 7 is avoided as much as possible. The spring 7 is easily damaged due to fatigue when being subjected to excessive pressure for a long time, and the problem of breakage is caused.

[0040] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement of some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A prestress monitoring device for a box girder anchor, comprising a box girder body (1), an anchor plate (2), a washer (3), and a pressure sensor (4), wherein a plurality of steel strands (5) are threaded through the box girder body (1), a monitoring component for monitoring the prestress of the steel strands (5) is provided on the steel strands (5), and a limiting component for uniformly applying force to the pressure sensor (4) is provided on the washer (3), characterized in that: The limiting assembly comprises a plurality of fixing sleeves (6) fixedly connected to one side of the sidewall of the gasket (3), a spring (7) is fixedly connected in each of the fixing sleeves (6), the other end of the spring (7) is fixedly connected with a support rod (8) which is slidingly arranged in the fixing sleeve (6), a same limiting ring (9) is sleeved on the plurality of support rods (8), and a fastening block (10) is threadedly connected to the end of the support rod (8) away from the fixing sleeve (6).

2. The device for monitoring the prestress under the anchor of a box girder according to claim 1, characterized in that: The monitoring assembly comprises a jack (11) installed on the steel strand (5), and an anchorage device (12) is installed between the jack (11) and the pressure sensor (4).

3. The device for monitoring the prestress under the anchor of a box girder according to claim 2, characterized in that: The pressure sensor (4) is fixedly connected with an annular block (13) close to one side of the sidewall of the gasket (3), and an annular groove (14) is formed in one side of the sidewall of the gasket (3) and matched with the annular block (13).

4. The device for monitoring the prestress under the anchor of a box girder according to claim 3, characterized in that: A plurality of limiting grooves (15) are formed in the inner sidewall of the fixing sleeve (6), and a plurality of limiting blocks (16) are fixedly connected to one end of the support rod (8) located in the fixing sleeve (6) and matched with the limiting grooves (15) respectively.

5. The device for monitoring the prestress under the anchor of a box girder according to claim 4, characterized in that: A limiting rod (17) is fixedly connected in each of the limiting grooves (15), and the limiting block (16) is sleeved on the limiting rod (17).

6. The device for monitoring the prestress under the anchor of a box girder according to claim 5, characterized in that: The jack (11) is fixedly connected with a guide rod (18) on both sides.

7. The device for monitoring the prestress under the anchor of a box girder according to claim 6, characterized in that: The pressure sensor (4) and the gasket (3) are fixedly connected with a guide block (19) on both sides, and the end of the guide rod (18) away from the jack (11) penetrates through the guide block (19) and is slidingly arranged.

8. The device for monitoring the prestress under the anchor of a box girder according to claim 7, characterized in that: The box girder body (1) is provided with a data acquisition module (20), and the data acquisition module (20) is electrically connected with the pressure sensor (4).

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