Novel bridge floor continuous static load test device for small box girder bridge

Abstract

The utility model discloses a novel bridge floor continuous static load test device for a small box girder bridge. A test piece comprises two inverted-L-shaped precast beam bodies, a plate-shaped continuous structural layer arranged on the two precast beam bodies and reinforced concrete plates arranged at the two ends of the continuous structural layer. The test device comprises a support and a spring support which are arranged below two precast beam bodies, and an active stress application rod which is arranged on a continuous structural layer and above each reinforced concrete slab; the two supports are arranged at the positions close to the opposite faces of the two prefabricated beam bodies. The two spring supports are arranged at the positions close to the opposite faces of the two prefabricated beam bodies and on the outer sides of the two supports, provide vertical elastic support for the corresponding prefabricated beam bodies and allow compression deformation. And all the active stress application rods are arranged below a cross beam at the upper end of the gate-type reaction frame through adjustable brackets, and are provided with pressure sensors. According to the utility model, the stress of the bridge deck continuous structure of the inverted T-shaped bent cap small box girder bridge under various load conditions can be accurately simulated.

Description

Technical Field

[0001] This utility model relates to the field of continuous static load testing technology for box girder bridge decks, and particularly to a novel continuous static load testing device for small box girder bridge decks. Background Technology

[0002] With the acceleration of urbanization, bridges, as an important part of urban transportation, have received widespread attention for their safety and durability.

[0003] As a common type of bridge, the performance of the continuous structure of the small box girder bridge deck directly affects the overall performance of the bridge.

[0004] However, traditional continuous bridge deck structures have some problems in practical applications, such as easy cracking and poor durability.

[0005] Therefore, researching a novel continuous bridge deck structure to improve its load-bearing capacity and durability is of significant engineering importance. However, the development of new structures and technologies typically requires verification of their safety and reliability through relevant experiments.

[0006] The existing methods for continuous static load testing of bridge decks have the following main technical shortcomings:

[0007] 1) Traditional reaction frames cannot adapt to the special structure of the inverted T-shaped cap beam in the continuous zone of the small box girder bridge deck;

[0008] 2) It is impossible to accurately simulate the load conditions of beam rotation, and the deviation between the beam end rotation angle in the test and the actual working conditions is large;

[0009] 3) The loading device is simple and difficult to simulate complex forces under multiple working conditions.

[0010] Therefore, how to accurately simulate the stress of the continuous structure of the bridge deck of the inverted T-shaped cap beam small box girder bridge under various load conditions, and to achieve stronger adaptability, higher precision and better safety, has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0011] In view of the above-mentioned deficiencies of the prior art, this utility model provides a new type of continuous static load test device for small box girder bridge decks. The purpose is to accurately simulate the stress of the continuous structure of the bridge deck of an inverted T-shaped cap girder small box girder bridge under various load conditions, and it has stronger adaptability, higher precision and better safety.

[0012] To achieve the above objectives, this utility model discloses a novel continuous static load test device for small box girder bridge decks. The test specimen includes two symmetrically spaced precast beams, each in the shape of an inverted "L", a continuous structural layer in the form of a plate, and reinforced concrete slabs at both ends of the continuous structural layer.

[0013] The test apparatus includes supports and spring supports set under the two precast beams, and active force-adding rods set above each of the continuous structural layers and each of the reinforced concrete slabs;

[0014] The two supports are positioned near the facing sides of the two precast beams;

[0015] The two spring supports are positioned near the opposite sides of the two precast beams, and on the outer side of the two supports, they provide vertical elastic support to the corresponding precast beams and allow compressive deformation.

[0016] All of the aforementioned active force-applying rods are mounted on the underside of the upper crossbeam of the gantry reaction frame via adjustable brackets, and each is equipped with a pressure sensor.

[0017] Preferably, each of the aforementioned supports is located directly below the junction of the reinforced concrete slab and the continuous structural layer on the corresponding side, and is composed of two or more rubber supports stacked together to simulate the stiffness of the original bridge supports.

[0018] Preferably, each of the spring supports is located directly below the active force-adding rod corresponding to the reinforced concrete slab on the corresponding side, and each includes two support pads and a plurality of helical springs arranged in an array between the two support pads.

[0019] Preferably, each of the active force-applying rods is a hydraulic jack.

[0020] Preferably, a pad is provided on the top of the continuous structural layer and on each of the reinforced concrete slabs, corresponding to the position of the active force-adding rod.

[0021] Preferably, a lateral limiting rod and a corresponding limiting sensor are provided between the two columns of the portal reaction frame;

[0022] Each of the precast beams includes a cantilever portion that is flush with the upper surface and extends toward the other precast beam;

[0023] The lateral limiting rod is located between the two precast beams, directly below any of the cantilever sections. When any of the cantilever sections moves downward and contacts the lateral limiting rod, the limiting sensor sends a signal.

[0024] The beneficial effects of this utility model are:

[0025] This invention can accurately simulate the stress of the continuous structure of the bridge deck of an inverted T-shaped cap beam small box girder bridge under various load conditions, and has stronger adaptability, higher precision and better safety.

[0026] This invention employs a combination of supports and spring supports, which can prevent the continuous structural layers of the specimen from being stressed by the weight of the beam itself, while the spring supports have sufficient deformation to meet the requirements of the test.

[0027] This utility model allows for flexible adjustment of the distance and stiffness between the support and the spring support to adapt to the needs of different bridge designs and tests.

[0028] This utility model includes multiple sets of active force-adding rods that can simulate different combined load conditions and achieve precise load control.

[0029] The lateral limiting rod of this invention can prevent lateral instability and damage to the specimen during installation and testing.

[0030] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description

[0031] Figure 1 This is a side view of an embodiment of the present invention.

[0032] Figure 2 A schematic diagram of the end face structure of an embodiment of the present invention is shown.

[0033] Figure 3 This diagram shows a schematic of the spring support structure in one embodiment of the present invention. Detailed Implementation

[0034] Example: Figure 1 and Figure 2 As shown, the novel bridge deck continuous static load test device for small box girder bridges includes two symmetrically spaced precast beams 1, both inverted "L" shapes, a continuous structural layer 2 in the form of a plate set on the two precast beams 1, and reinforced concrete slabs set at both ends of the continuous structural layer 2.

[0035] The test apparatus includes supports 3 and spring supports 4 installed under two precast beams 1, and active force-adding rods 6 installed above each reinforced concrete slab in the continuous structural layer 2.

[0036] Two supports 3 are positioned near the opposite side of the two precast beams 1;

[0037] Two spring supports 4 are positioned near the opposite sides of the two precast beams 1, on the outside of the two supports 3, providing vertical elastic support to the corresponding precast beams 1 and allowing compressive deformation;

[0038] All active force-applying rods 6 are mounted below the upper crossbeam 71 of the gantry reaction frame 7 via adjustable brackets, and each is equipped with a pressure sensor.

[0039] In practical applications, this utility model achieves symmetrical loading of two reinforced concrete slabs through the active force-applying rod 6, that is, synchronous pressure is applied to the two reinforced concrete slabs near their ends, and concentrated loading of the continuous structural layer 2, that is, multi-condition loading work with pressure applied at the center of the continuous structural layer 2.

[0040] In some embodiments, each support 3 is located directly below the junction of the reinforced concrete slab and the continuous structural layer 2 on the corresponding side, and is composed of two or more rubber supports stacked together to simulate the stiffness of the original bridge support.

[0041] In practical applications, support 3 uses a structure composed of two or more rubber supports stacked together, allowing users to adjust the total height by changing the number of rubber supports.

[0042] In some embodiments, each spring support 4 is located directly below the active force-adding rod 6 corresponding to the corresponding side reinforced concrete slab, and includes two support pads 41 and a plurality of helical springs 42 arranged in an array between the two support pads 41.

[0043] In practical applications, the use of multiple arrays of helical springs 42 arranged between two support pads 41 to form a spring support 4 can prevent the continuous structural layer of the bridge deck from being stressed by the weight of the beam, while having sufficient elastic deformation to meet the loading conditions.

[0044] In some embodiments, each active lever 6 is a hydraulic jack.

[0045] In some embodiments, pads 5 are provided on the top of the continuous structural layer 2 and each reinforced concrete slab, corresponding to the positions of the active force-adding rods 6.

[0046] In some embodiments, a transverse limiting rod 8 and a corresponding limiting sensor are provided between the two columns 72 of the portal reaction frame 7;

[0047] Each precast beam 1 includes a cantilever portion 11 that is flush with the upper surface and extends toward another precast beam 1;

[0048] The lateral limit bar 8 is located between the two precast beams 1, directly below any cantilever 11. When any cantilever 11 moves downward and contacts the lateral limit bar 8, the limit sensor sends a signal.

[0049] The steps for using this utility model are as follows:

[0050] 1. Hoist the specimen onto support 3 and spring support 4. When in place, calibrate the height of the support point at the bottom of the beam to ensure that the compression of support 3 is consistent with the design value.

[0051] 2. Install and fix the lateral limit rod 8 to prevent out-of-plane instability of the component during installation and testing.

[0052] 3. Install the test loading system, including multiple active force-applying rods 6.

[0053] 4. Start the test. Apply vertical force through the active force-adding rod 6 according to the preset loading mode and load grading, and collect data such as component displacement and stress at the same time.

[0054] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A new type of continuous static load test device for the bridge deck of a small box girder bridge, characterized in that, The test piece comprises two symmetrically spaced inverted "L"-shaped prefabricated beam bodies (1), a continuous construction layer (2) in the form of a plate arranged on the two prefabricated beam bodies (1), and reinforced concrete slabs arranged at the two ends of the continuous construction layer (2); The test device comprises supports (3) and spring supports (4) arranged under the two prefabricated beam bodies (1), and active force rods (6) arranged above the continuous construction layer (2) and each of the reinforced concrete slabs; The two supports (3) are arranged close to the facing sides of the two prefabricated beam bodies (1); The two spring supports (4) are arranged close to the opposite sides of the two prefabricated beam bodies (1), outside the two supports (3), and provide vertical elastic support and allow compression deformation to the corresponding prefabricated beam bodies (1); All the active force rods (6) are arranged below the upper end crossbeam (71) of a portal reaction frame (7) through adjustable supports, and are each provided with a pressure sensor.

2. The new type of continuous static load test device for deck of small box girder bridge according to claim 1, characterized in that, Each of the supports (3) is arranged directly below the position where the corresponding side reinforced concrete slab meets the continuous construction layer (2), and is composed of two or more rubber supports stacked together to simulate the stiffness of the original bridge support.

3. The new type of continuous static load test device for deck of small box girder bridge according to claim 1, characterized in that, Each of the spring supports (4) is arranged directly below the corresponding active force rod (6) corresponding to the corresponding side reinforced concrete slab, and comprises two support stiffness spacers (41) and a plurality of helical springs (42) arranged in an array between the two support stiffness spacers (41).

4. The new type of continuous static load test device for deck of small box girder bridge according to claim 1, characterized in that, Each of the active force rods (6) is a hydraulic jack.

5. The new type of continuous static load testing device for deck of small box girder bridge according to claim 1, characterized in that, The upper surface of the continuous construction layer (2) and each of the reinforced concrete slabs is provided with a pad (5) corresponding to the position of the corresponding active force rod (6).

6. The new type of continuous static load test device for deck of small box girder bridge according to claim 1, characterized in that, The portal reaction frame (7) is provided with a transverse limiting rod (8) between the two upright columns (72) and a corresponding limiting sensor; Each of the prefabricated beam bodies (1) comprises a cantilever portion (11) flush with the upper surface and extending in the direction of the other prefabricated beam body (1); The transverse limiting rod (8) is located between the two prefabricated beam bodies (1) and directly below any of the cantilever portions (11), and the limiting sensor sends a signal when any of the cantilever portions (11) moves downward to contact the transverse limiting rod (8).

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