A waterproof performance test system and test method for railway bridge expansion devices

Abstract

The present invention discloses a waterproof performance test system and test method for a railway bridge expansion device, which relates to the technical field of railway bridge engineering. The system includes a test platform system, a test tooling system, a water injection and drainage system, a water blocking and sealing system, and a test control and data acquisition system. The test tooling system is arranged on the test platform system. The test tooling system includes symmetrically arranged fixed beam end models and displacement beam end models. A test specimen is placed between the fixed beam end model and the displacement beam end model. The water blocking and sealing systems are respectively arranged on the fixed beam end model and the displacement beam end model. A water injection and drainage system is connected between the fixed beam end model and the displacement beam end model. The test tooling system is electrically connected to the test control and data acquisition system. Based on the above system of the present invention, the test method can simulate the waterproof performance of the expansion device under the operating state, and can verify its ultimate waterproof ability and fatigue performance.

Description

Technical Field

[0001] The present invention relates to the technical field of railway bridge engineering, and particularly to a waterproof performance test system and test method for a railway bridge expansion device. Background Art

[0002] A railway bridge expansion device is provided to meet the requirements of bridge deck deformation. Usually, an expansion device is set between two beam ends, between a beam end and a bridge abutment, or at the hinged position of the bridge. The railway bridge expansion device needs to have certain waterproof and other performances. To ensure its reliable performance, a waterproof performance test needs to be carried out before installation and use. The existing waterproof performance test method for railway bridge expansion devices mainly adopts the hydrostatic test method, which cannot effectively characterize the waterproof performance of railway bridge expansion devices under operating conditions. Summary of the Invention

[0003] The purpose of the present invention is to provide a waterproof performance test system and test method for a railway bridge expansion device to solve the problems existing in the above-mentioned prior art, simulate the waterproof performance of the expansion device under operating conditions, and verify its ultimate waterproof ability and fatigue performance.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] The present invention provides a waterproof performance test system for a railway bridge expansion device, including a test platform system, a test tooling system, a water injection and drainage system, a water blocking and sealing system, and a test control and data acquisition system. The test tooling system is arranged on the test platform system. The test tooling system includes symmetrically arranged fixed beam end models and displacement beam end models. A test sample is placed between the fixed beam end model and the displacement beam end model. Water blocking and sealing systems are respectively arranged on the fixed beam end model and the displacement beam end model. A water injection and drainage system is connected between the fixed beam end model and the displacement beam end model. The test tooling system is electrically connected to the test control and data acquisition system.

[0006] Optionally, the test platform system includes a fixedly arranged platform foundation. A fixed platform is installed on the platform foundation, and the fixed beam end model is fixedly installed on the fixed platform. On the platform foundation on one side of the fixed platform, a plurality of parallel displacement guide rails are fixedly installed. The plurality of displacement guide rails are horizontally perpendicular to the fixed platform. A slider is slidably arranged on the displacement guide rails. A displacement platform is fixedly connected to the slider. An actuator is connected to the side of the displacement platform away from the fixed platform.

[0007] Optionally, the test tooling system further includes displacement sensors fixedly installed at both ends of the fixed beam end model. Embedded parts are fixedly installed at the bottoms of the fixed beam end model and the displacement beam end model respectively. On both sides of the embedded part at the bottom of the fixed beam end model, it is connected to the fixed platform through inner side anchor fittings and outer side anchor fittings respectively. On both sides of the embedded part at the bottom of the displacement beam end model, it is connected to the displacement platform through inner side anchor fittings and outer side anchor fittings respectively; steel columns are fixedly arranged at both ends of the top of the fixed beam end model and the displacement beam end model through chemical anchor bolts. An acrylic board is fixedly connected between the steel columns at both ends of the fixed beam end model, and another acrylic board is fixedly connected between the steel columns at both ends of the displacement beam end model; both ends of the test specimen are bent upwards. A water storage part is formed in the space between the fixed beam end model, the displacement beam end model, and the test specimen; there is a step on the inner sides of the fixed beam end model and the displacement beam end model, and the steps on the inner sides of the fixed beam end model and the displacement beam end model are used to support the test specimen.

[0008] Optionally, the water injection and drainage system includes a water injection pipe and a drainage pipe; the water injection pipe is arranged outside one end of the acrylic board at the displacement beam end model, and the water injection pipe is fixed to the steel column and connected to the water inlet at the top inside the acrylic board through an elbow; the water outlet at one end of the drainage pipe passes through the displacement beam end model and is communicated with the bottom of the water storage part, and the drainage port at the other end of the drainage pipe is connected to the sewer; the drainage pipe is fixed to the displacement beam end model through a pipe clamp.

[0009] Optionally, a water injection valve is installed on the water injection pipe, and a drainage valve is installed on the drainage pipe.

[0010] Optionally, holes are drilled at corresponding positions in the overlapping areas between both ends of the acrylic board and the steel column and are fixedly connected by bolts. Holes are drilled at corresponding positions in the overlapping areas between the bottoms of the two acrylic boards and the fixed beam end model and the displacement beam end model and are fixedly connected by anchor bolts.

[0011] Optionally, the water blocking and sealing system includes a lap joint sealing glue and a bolt head sealing glue; the bolt head sealing glue is applied at the bolt head position; the lap joint gaps between the acrylic board and the steel column and between the fixed beam end model and the displacement beam end model are sealed and connected by the lap joint sealing glue.

[0012] Optionally, the acrylic board has permeability, and scales are marked on the surface of the acrylic board.

[0013] Optionally, the test control and data acquisition system includes a computer, an oil pump switch, and a control cabinet that are electrically connected; the oil pump switch is electrically connected to the actuator, and the computer is signal-connected to the displacement sensor.

[0014] The present invention also provides a method for testing the waterproof performance of a railway bridge expansion device, including the following steps:

[0015] Step 1: Install the test specimen; turn on the oil pump switch, adjust the gap width between the fixed beam end model and the displacement beam end model to be equal to the width of the test specimen, arrange the test specimen on the step between the fixed beam end model and the displacement beam end model, adjust the exposed lengths at both ends of the test specimen to be equal, bend the two ends of the test specimen upward, and narrow the gap width between the fixed beam end model and the displacement beam end model to make the test specimen in a pre-compressed state;

[0016] Step 2: Extrude the test specimen; continue to narrow the gap width between the fixed beam end model and the displacement beam end model to compress and deform the test specimen to the designed width;

[0017] Step 3: Inject water; connect the water injection pipe to the water source, open the water injection valve, inject water into the water storage part step by step, and observe the water leakage state between the test specimen and the concrete interfaces of the fixed beam end model and the displacement beam end model in real time until the designed water head height;

[0018] Step 4: Waterproof performance test; use the computer to control the actuator to make reciprocating movements, record the pressure values at the peak and trough of the compression of the test specimen, and observe whether there is water leakage at the concrete interfaces between the test specimen and the fixed beam end model and the displacement beam end model;

[0019] Step 5: Drain water; after the test is completed, open the drain valve to drain the water in the water storage part, contract the actuator, open the beam gap, and remove the test specimen.

[0020] The present invention has achieved the following technical effects compared with the prior art:

[0021] The waterproof performance test system and test method of the railway bridge expansion device of the present invention can verify its ultimate waterproof ability and fatigue performance, can establish the relationship between hydrostatic pressure and sealing pressure, and can simulate the service performance of the expansion device under operating conditions. Its design is reasonable, the pertinence is strong, the measurement result is accurate, and the operation is convenient. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a three-dimensional view of the structure of a waterproof performance test system for a railway bridge expansion device of the present invention;

[0024] Figure 2 It is a middle sectional view of a waterproof performance test system for a railway bridge expansion device of the present invention;

[0025] Figure 3 It is an end sectional view of a waterproof performance test system for a railway bridge expansion device of the present invention;

[0026] Figure 4 It is a partial enlarged view of a waterproof performance test system for a railway bridge expansion device of the present invention;

[0027] In the figure: 100 - waterproof performance test system for railway bridge expansion device; 11 - platform foundation; 12 - actuator; 13 - fixed platform; 14 - displacement platform; 15 - displacement guide rail; 16 - slider; 21 - fixed beam end model; 22 - displacement beam end model; 23 - displacement sensor; 24 - embedded part; 25 - inner anchor; 26 - outer anchor; 27 - steel column; 28 - chemical anchor bolt; 29 - acrylic board; 30 - water storage part; 31 - water injection pipe; 32 - water injection valve; 33 - drain pipe; 34 - drain valve; 35 - water outlet; 41 - sealing glue for lap joint sealing; 42 - sealing glue for bolt head sealing; 51 - computer; 52 - oil pump switch; 53 - control cabinet; 6 - test specimen; 7 - water. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] The purpose of the present invention is to provide a waterproof performance test system and test method for a railway bridge expansion device to solve the problems existing in the above-mentioned prior art, which can simulate the waterproof performance of the expansion device under the operating state and can verify its ultimate waterproof ability and fatigue performance.

[0030] In order to make the above-mentioned objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0031] The present invention provides a waterproof performance test system 100 for a railway bridge expansion device, as Figures 1-4As shown in the figure, it includes a test platform system, a test tooling system, a water injection and drainage system, a water plugging and sealing system, a test control and data acquisition system, and a test specimen. Among them, the test platform system includes a platform foundation 11, an actuator 12, a fixed platform 13, a displacement platform 14, a displacement guide rail 15, and a slider 16; the test tooling system includes a fixed beam end model 21, a displacement beam end mold 22, a displacement sensor 23, embedded parts 24, inner side anchor fittings 25, outer side anchor fittings 26, steel columns 27, chemical anchor bolts 28, acrylic plates 29, and a water storage part 30; the water injection and drainage system includes a water injection pipe 31, a water injection valve 32, a drainage pipe 33, a drainage valve 34, and a water outlet 35; the water plugging and sealing system includes a lapped joint sealing sealant 41 and a bolt head sealing sealant 42; the test control and data acquisition system includes a computer 51, an oil pump switch 52, and a control cabinet 53.

[0032] When the present invention works, the test specimen 6 is horizontally arranged between the fixed beam end model 21 and the displacement beam end model 22. At the corresponding positions of the steel columns 27 at both ends of the fixed beam end model 21 and the displacement beam end model 22, it is bent upward. The displacement platform 14 is used to apply pressure to the test specimen 6 to make the test specimen 6 compress and deform. Then, a water storage part 30 is formed between the displacement platform 14 and the test tooling on the fixed platform 13 by squeezing the test specimen 6. Water is injected into the water storage part 30 to the designed water head height. The opening and closing of the displacement platform 14 and the fixed platform 13 are used to simulate the change in the beam end joint width caused by the telescopic deformation of the bridge, so as to achieve the purpose of testing the waterproof performance of the test specimen 6. Among them, all the stressed members have sufficient strength and stiffness. The steel members are Q355 steel, and both the fixed beam end model 21 and the displacement beam end model 22 are C50 reinforced concrete, and are designed full-scale according to the 32m simply supported box girder of the high-speed railway passenger dedicated line.

[0033] The fixed beam end model 21 and the displacement beam end model 22 are arranged in a symmetric structure, and a stepped joint is designed on the inner side of each of them to support the test specimen 6 to prevent the test specimen 6 from slipping when the extrusion force is insufficient; the fixed platform 13 and the platform foundation 11, the displacement platform 14 and the slider 16, and the displacement guide rail 15 and the platform foundation 11 are all fixedly connected, and the displacement guide rail 15 and the slider 16 are slidably connected; the actuator 12 is fixedly connected to the platform foundation 11, and the telescopic rod of the actuator 12 is hinged to the displacement platform 14, and the telescopic movement of the telescopic rod is controlled by the computer 51; embedded parts 24 are pre-installed when the fixed beam end model 21 and the displacement beam end model 22 are cast to facilitate their fixation to the fixed platform 13 and the displacement platform 14 respectively; the inner side anchor parts 24 and the outer side anchor parts 25 are bolted to the embedded parts 24 to fix the fixed beam end model 21 and the displacement beam end model 22 to the fixed platform 13 and the displacement platform 14 respectively; displacement sensors 23 are arranged at both ends of the fixed beam end model 21, and the other ends of the displacement sensors 23 are fixed to both ends of the displacement beam end model 22 respectively, capable of measuring the beam joint width in real time; four steel columns 26 are respectively arranged at both ends of the fixed beam end model 21 and the displacement beam end model 22, and the bottom is anchored to the fixed beam end model 21 and the displacement beam end model 22 by chemical anchor bolts 28, and the gaps between them and the fixed beam end model 21 and the displacement beam end model 22 are sealed tightly with structural adhesive to prevent water leakage; holes are drilled at corresponding positions in the overlapping area between the acrylic board 29 and the steel column 26 and bolted, and holes are drilled at corresponding positions in the overlapping area between the acrylic board 29 and the fixed beam end model 21 and the displacement beam end model 22 and bolted, and bolt head sealing adhesive 42 is applied at the bolt head position to prevent water leakage through the holes; the overlapping gaps between the acrylic board 29 and the steel column 27, and the fixed beam end model 21 and the displacement beam end model 22 are sealed with overlapping joint sealing adhesive 41; the acrylic board 29 has good permeability and is marked with scales on the surface to facilitate reading the water head height.

[0034] Further preferably, the water injection pipe 31 is arranged at one end of the acrylic board 29 and fixed to the adjacent steel column 26, and the water inlet is located at the inner top of the acrylic board 29 through an elbow connection; the drain pipe 33 passes through the displacement beam end model 22 to connect the water outlet 35 to the bottom of the water storage part 30, the drain pipe 33 is fixed to the displacement beam end model 22 through a pipe clamp, and the other end drain port is connected to the sewer; the computer 51 can control the movement direction, movement speed, and telescopic amount of the telescopic rod of the actuator 12, and can record the force value in real time.

[0035] The present invention also provides a method for testing the waterproof performance of a railway bridge expansion device, including the following steps:

[0036] Step 1: Install the test specimen 6; Turn on the oil pump switch 52, adjust the slit width between the fixed beam end model 21 and the displacement beam end model 22 to be equivalent to the width of the test specimen 6, arrange the test specimen 6 on the step between the fixed beam end model 21 and the displacement beam end model 22, adjust the exposed lengths at both ends of the test specimen 6 to be generally equivalent, bend the two ends of the test specimen 6 upward, and narrow the slit width between the fixed beam end model 21 and the displacement beam end model 22 to put the test specimen 6 in a pre-compressed state;

[0037] Step 2: Extrude the test specimen 6; Continuously narrow the slit width between the fixed beam end model 21 and the displacement beam end model 22 to compress and deform the test specimen 6 to the designed width;

[0038] Step 3: Inject water; Connect the water injection pipe 31 to the water source, open the water injection valve 32, inject water 7 into the water storage part 30 step by step, and observe the water leakage state between the test specimen 6 and the concrete interfaces of the fixed beam end model 21 and the displacement beam end model 22 in real time until the designed water head height;

[0039] Step 4: Waterproof performance test; Use the computer 51 to control the actuator 12 to make reciprocating movements, record the pressure values at the peak and trough of the compression of the test specimen 6, and observe whether there is water leakage at the concrete interfaces between the test specimen 6 and the fixed beam end model 21 and the displacement beam end model 22. Change the hydrostatic pressure by the water injection volume to test the ultimate waterproof ability, and control the actuator 12 by the computer 51 to adjust the opening and closing speed, amplitude and cycle times of the beam slit to test the fatigue performance of the test specimen. Record data such as force values and water head heights, and the relationship curve between the sealing pressure of the hydrostatic pressure can be obtained.

[0040] Step 5: Drain water; After the test is completed, open the drain valve 34 to drain all the water 7 in the water storage part 30, contract the actuator 12, open the beam slit, and remove the test specimen 6.

[0041] In the present invention, specific examples are used to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A waterproof performance test system for railway bridge expansion devices, characterized in that: It includes a test platform system, a test tooling system, a water injection and drainage system, a water plugging and sealing system, a test control and data acquisition system; the test tooling system is arranged on the test platform system, and the test tooling system includes a fixed beam end model and a displacement beam end model which are symmetrically arranged, and a test specimen is placed between the fixed beam end model and the displacement beam end model; the fixed beam end model and the displacement beam end model are respectively provided with a water plugging and sealing system, and a water injection and drainage system is connected between the fixed beam end model and the displacement beam end model; the test tooling system is electrically connected to the test control and data acquisition system; both ends of the test specimen are bent upward, and a water storage part is formed in the space between the fixed beam end model, the displacement beam end model and the test specimen; there is a step on the inner sides of the fixed beam end model and the displacement beam end model respectively, and the steps on the inner sides of the fixed beam end model and the displacement beam end model are used to support the test specimen; the test platform system includes a fixedly arranged platform foundation, a fixed platform is installed on the platform foundation, and the fixed beam end model is fixedly installed on the fixed platform; multiple parallel displacement guide rails are fixedly installed on the platform foundation on one side of the fixed platform, and the multiple displacement guide rails are horizontally perpendicular to the fixed platform; a slider is slidably arranged on the displacement guide rails, a displacement platform is fixedly connected to the slider, and an actuator is connected to one side of the displacement platform away from the fixed platform; the test tooling system also includes a displacement sensor, the displacement sensor is fixedly installed at both ends of the fixed beam end model, embedded parts are respectively fixedly installed at the bottoms of the fixed beam end model and the displacement beam end model, both sides of the embedded part at the bottom of the fixed beam end model are respectively connected to the fixed platform through inner side anchor fittings and outer side anchor fittings, and both sides of the embedded part at the bottom of the displacement beam end model are respectively connected to the displacement platform through inner side anchor fittings and outer side anchor fittings; steel columns are fixedly arranged at both ends of the top of the fixed beam end model and the displacement beam end model respectively through chemical anchor bolts, an acrylic board is fixedly connected between the steel columns at both ends of the fixed beam end model, and another acrylic board is fixedly connected between the steel columns at both ends of the displacement beam end model; the water injection and drainage system includes a water injection pipe and a drainage pipe; the water injection pipe is arranged outside one end of the acrylic board at the displacement beam end model, and the water injection pipe is fixed to the steel column and is connected to the water inlet at the inner top of the acrylic board through an elbow; the water outlet at one end of the drainage pipe passes through the displacement beam end model and is communicated with the bottom of the water storage part, and the drainage port at the other end of the drainage pipe is connected to the sewer; the drainage pipe is fixed to the displacement beam end model through a pipe clamp; a water injection valve is installed on the water injection pipe, and a drainage valve is installed on the drainage pipe; holes are drilled at the corresponding positions in the overlapping areas between both ends of the acrylic board and the steel column and are fixedly connected by bolts, and holes are drilled at the corresponding positions in the overlapping areas between the bottoms of the two acrylic boards and the fixed beam end model and the displacement beam end model and are fixedly connected by anchor bolts.

2. The waterproof performance test system for railway bridge expansion devices according to claim 1, characterized in that: The water plugging and sealing system includes a lap joint sealing adhesive and a bolt head sealing adhesive; the bolt head sealing adhesive is applied at the bolt head position; the lap joint between the acrylic plate, the steel column, the fixed beam end model and the displacement beam end model is sealed and connected through the lap joint sealing adhesive.

3. The waterproof performance test system for railway bridge expansion devices according to claim 1, characterized in that: The acrylic plate has permeability, and the surface of the acrylic plate is marked with scales.

4. The waterproof performance test system for railway bridge expansion devices according to claim 1, characterized in that: The test control and data acquisition system includes a computer, an oil pump switch and a control cabinet that are electrically connected; the oil pump switch is electrically connected to the actuator, and the computer is signal-connected to the displacement sensor.

5. A waterproof performance test method for railway bridge expansion devices using the waterproof performance test system for railway bridge expansion devices according to any one of claims 1 to 4, characterized in that: It includes the following steps: Step 1: Install the test specimen; turn on the oil pump switch, adjust the gap width between the fixed beam end model and the displacement beam end model to be equal to the width of the test specimen, arrange the test specimen on the step between the fixed beam end model and the displacement beam end model, adjust the exposed lengths at both ends of the test specimen to be equal, bend the two ends of the test specimen upward, and narrow the gap width between the fixed beam end model and the displacement beam end model to make the test specimen in a pre-compressed state; Step 2: Extrude the test specimen; Continue to narrow the gap width between the fixed beam end model and the displacement beam end model to make the test specimen compressed and deformed to the designed width; Step 3: Inject water; connect the water injection pipe to the water source, open the water injection valve, inject water into the water storage part step by step, and observe the water leakage state between the test specimen and the concrete interfaces of the fixed beam end model and the displacement beam end model in real time until the designed water head height; Step 4: Waterproof performance test; Use the computer to control the actuator to make reciprocating movements, record the pressure values at the peak and trough of the compression of the test specimen, and observe whether there is water leakage at the concrete interfaces of the test specimen and the fixed beam end model and the displacement beam end model; Step 5: Drain water; after the test is completed, open the drain valve to drain the water in the water storage part, the actuator contracts, the beam gap opens, and the test specimen is removed.

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