A stress test device for a connecting structure of a T-shaped inverted roof beam expansion joint

Abstract

The utility model discloses a kind of stress test testing devices of inverted T cover beam expansion joint connecting structure, it is related to building material testing technical field;And the utility model includes test table, the upper surface of test table is equipped with two pieces of reinforced concrete slab to simulate bridge deck slab, the opposite end of two bridge deck slab is all provided with single-seam expansion joint reserved slot;In the utility model, by being assembled in the reserved slot of two side bridge deck slab in single-seam expansion joint, then by the loading device and the stretching device of being set respectively to expansion joint exert pressure and tension, to simulate the stress performance of single-seam expansion joint of special-shaped railway single-seam expansion joint under bidirectional loading condition, by simulating the actual stress condition of single-seam expansion joint, the load-carrying capacity test is carried out to single-seam expansion joint, to reduce the stress test deviation of single-seam expansion joint.

Description

Technical Field

[0001] This utility model relates to the field of building material testing technology, specifically a stress testing device for the expansion joint connection structure of an inverted T-shaped cap beam. Background Technology

[0002] An inverted T-shaped cap beam is a type of bridge structure commonly used in the construction of urban viaducts. Its design aims to minimize the height of the viaduct while ensuring sufficient space for vehicles to travel on the bridge and for vehicles or pedestrians to pass underneath, thereby reducing the technical difficulty and investment in design and construction.

[0003] However, the number of joints at the same support point of a traditional inverted T-shaped cap beam is twice that of a traditional cap beam. This double-joint structure increases the number of expansion joints in bridge design, which not only reduces the flatness of the bridge deck and driving comfort, but also increases the overall cost of the bridge.

[0004] To reduce the number of expansion joints at the inverted T-shaped cap beam, the top plate of the extended box girder is used to form a cantilever plate placed on the inverted T-shaped cap beam. A 5mm thick rubber pad is provided between the cantilever plate and the inverted T-shaped cap beam. The expansion joint slot is moved from the box girder to the cantilever plate on the inverted T-shaped cap beam. In actual engineering, special-shaped steel single-slot expansion joints are usually used to meet the requirements of bridge deck deformation.

[0005] Before leaving the factory, irregularly shaped steel single-slit expansion joints need to undergo stress testing so that construction personnel can understand the expansion and contraction of the joint. However, existing technology still has some shortcomings in stress testing of irregularly shaped steel single-slit expansion joints:

[0006] 1. When conducting stress tests on irregular steel single-slit expansion joints using existing technology, the test site cannot provide the actual assembly environment for the irregular steel single-slit expansion joint, which leads to deviations in the stress test results of the expansion joint.

[0007] 2. Existing test equipment basically only considers the stress of irregular steel single-slit expansion joints under tensile or compressive loads, and cannot accurately simulate the stress performance of irregular steel single-slit expansion joints under bidirectional loading.

[0008] 3. At the same time, existing technology is not convenient for applying pressure to irregular steel single-seam expansion joints, so it is impossible to know the load-bearing capacity of irregular steel single-seam expansion joints. Utility Model Content

[0009] In order to solve the above problems, the purpose of this utility model is to provide a stress test device for the expansion joint connection structure of the inverted T-shaped cap beam.

[0010] To solve the above technical problems, the present invention adopts the following technical solution: a stress test device for the expansion joint connection structure of an inverted T-shaped cap beam, including a test platform, the upper surface of which is provided with two bridge deck panels, each of which has a reserved groove at one end opposite to the other, and the bottom wall of each of the two reserved grooves is pre-embedded with a number of uniformly distributed pre-embedded steel bars.

[0011] The test bench is equipped with a tensile device, and a U-shaped frame is fixedly installed on the upper surface of the test bench. A pressure device is installed on the U-shaped frame.

[0012] The tensile device includes two wound steel ropes, and both ends of the test platform are provided with winding rollers. One of the wound steel ropes is wound on a winding roller, and the other ends of the two wound steel ropes are fixedly provided with connecting steel ropes. One of the connecting steel ropes is fixedly provided on one side of a bridge deck.

[0013] Both ends of the test bench are fixedly equipped with servo motors, and the drive output ends of the two servo motors are fixedly equipped with rotating rods. The rotating rods pass through the winding roller and are fixedly connected to the winding roller.

[0014] The pressurizing device includes a counterweight box, inside which are provided several counterweight plates. Two cylinders are fixedly installed on the upper end face of the U-shaped frame, and the upper end face of the counterweight box is detachably installed on the piston end of the two cylinders.

[0015] The counterweight box has a sliding pressure plate inside, and the lower surface of the pressure plate is in contact with the upper surface of one of the counterweight plates. A threaded rod is rotatably installed on the upper end face of the counterweight box, and one end of the threaded rod is rotatably connected to the middle of the pressure plate.

[0016] Preferably, two first sliders are fixedly provided on the lower surface of each of the two bridge panels, and the first sliders are slidably disposed on the upper surface of the test platform.

[0017] Preferably, support plates are fixedly provided at both ends of the test platform, and one end of the rotating rod is rotatably connected to the support plate.

[0018] Preferably, a second slider is slidably installed at both ends of the test platform, a connecting rod is fixedly provided on the upper surface of each of the two second sliders, a guide sleeve is fixedly provided at one end of each of the two connecting rods, and one end of the wound steel rope passes through the guide sleeve and makes movable contact with the inner wall of the guide sleeve.

[0019] Preferably, each of the piston ends of the two cylinders is fixedly provided with a mounting plate, and each of the two mounting plates is threadedly mounted with two mounting bolts, one end of which is threadedly connected to a threaded hole on the upper surface of the counterweight box.

[0020] Preferably, an anti-slip pad is fixedly installed on the lower end face of the counterweight box, and a cover plate is detachably installed on one side of the counterweight box.

[0021] Preferably, guide grooves are provided on both sides of the counterweight box, and guide blocks are fixedly provided on both sides of the clamping plate, with the guide blocks slidably disposed on the inner wall of the guide groove.

[0022] Preferably, a knob is fixedly provided at the other end of the threaded rod.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] 1. In this utility model, by setting a pressurizing device, the counterweight box and counterweight plate are driven to descend vertically. The counterweight box and counterweight plate press down on the irregular steel single-seam expansion joint, applying a downward pressure to the expansion joint and conducting a pressure test on the expansion joint device. This conveniently realizes the load-bearing capacity of the irregular steel single-seam expansion joint, and makes it easier for construction personnel to know the stress performance of the irregular steel single-seam expansion joint.

[0025] 2. In this utility model, the irregular steel single-slit expansion joint is assembled in the reserved groove of two bridge decks, and then the two bridge decks are pulled away from each other by the set tensioning device, so as to facilitate the simulation of the stress performance of the irregular steel single-slit expansion joint under bidirectional loading.

[0026] 3. In this utility model, by setting an addable counterweight plate, different numbers of counterweight plates can be assembled according to the load-bearing capacity test requirements of the irregular steel single-seam expansion joint, which is flexible and can meet the stress test requirements of the irregular steel single-seam expansion joint.

[0027] 4. In this utility model, by providing an actual assembly environment for the irregular steel single-slit expansion joint, the test operation is carried out under actual stress conditions, thereby reducing the stress test deviation of the irregular steel single-slit expansion joint. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of a stress test device for an inverted T-shaped expansion joint connection structure of a cap beam according to this utility model.

[0030] Figure 2 This is a schematic diagram of the connection structure between the bridge deck and the tensioning device of this utility model.

[0031] Figure 3 This utility model Figure 2 Enlarged schematic diagram of part A in the diagram.

[0032] Figure 4 This is a schematic diagram of the connection structure between the pressurizing device and the U-shaped frame of this utility model.

[0033] Figure 5 This is a schematic diagram of the internal structure of the counterweight box of this utility model.

[0034] Figure 6 This is a schematic diagram of the assembly of the irregular steel single-slit expansion joint and the bridge deck in an embodiment of this utility model.

[0035] In the diagram: 1. Test bench; 11. Bridge deck; 12. Reserved groove; 13. Embedded steel bar; 14. First slider; 15. U-shaped frame; 2. Tensioning device; 21. Winding steel rope; 211. Connecting steel rope; 22. Winding roller; 23. Servo motor; 24. Rotating rod; 25. Support plate; 27. Second slider; 28. Connecting rod; 29. ​​Guide sleeve; 3. Pressurizing device; 31. Counterweight box; 32. Counterweight plate; 33. Cylinder; 34. Mounting plate; 35. Mounting bolt; 36. Anti-slip pad; 37. Cover plate; 38. Pressing plate; 39. Guide groove; 4. Guide block; 41. Threaded rod; 42. Knob; 5. Expansion joint; 51. Rubber waterstop; 52. Concrete; 53. Filler. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Example: Figure 1-6As shown, this utility model provides a stress test device for the expansion joint connection structure of an inverted T-shaped cap beam, including a test platform 1. Two bridge deck panels 11 are provided on the upper surface of the test platform 1. Each of the two bridge deck panels 11 has a pre-reserved groove 12 at one opposite end. Several evenly distributed pre-embedded reinforcing bars 13 are pre-embedded in the bottom walls of both pre-reserved grooves 12. By setting the bridge deck panels 11, pre-reserved grooves 12, and pre-embedded reinforcing bars 13 on the test platform 1, after the anchoring reinforcing bars at the bottom of the expansion joint 5 are welded to the upper surface of the pre-embedded reinforcing bars 13, concrete 52 is poured into the pre-reserved grooves 12, thus fixing the expansion joint 5 within the pre-reserved grooves 12. Then, filler 53 is filled into the gap between the two pre-reserved grooves 12. After the rubber waterstop 51 is installed in the concave hole of the upper limiting steel strip of the two expansion joints 5, the two bridge deck panels 11 can be connected through the expansion joint 5 (see reference). Figure 6 Two first sliders 14 are fixedly installed on the lower surface of each of the two bridge panels 11. The first sliders 14 are slidably installed on the upper surface of the test bench 1. By setting the first sliders 14, the first sliders 14 can make the bridge panels 11 move in the horizontal direction.

[0038] The test bench 1 is equipped with a tension device 2, and a U-shaped frame 15 is fixedly installed on the upper surface of the test bench 1. A pressure device 3 is installed on the U-shaped frame 15. By setting the tension device 2, when the expansion joint 5 is assembled on the bridge deck 11, the tension device 2 can pull the two bridge decks 11 away from each other, and provide horizontal tension to the expansion joint 5 and the rubber waterstop 51. By setting the pressure device 3, the pressure device 3 can provide a downward pressure at the location of the expansion joint 5, and test the load-bearing capacity of the expansion joint 5 under bidirectional tension and compression.

[0039] The tensioning device 2 includes two wound steel ropes 21. Both ends of the test platform 1 are provided with winding rollers 22. One of the wound steel ropes 21 is wound on one winding roller 22. The other ends of the two wound steel ropes 21 are fixedly provided with connecting steel ropes 211. One of the connecting steel ropes 211 is fixedly provided on one side of a bridge deck 11. By driving the winding roller 22 to rotate, the winding roller 22 can wind and unwind the wound steel rope 21. The wound steel rope 21 can pull the bridge deck 11 to move horizontally on the test platform 1 through the connecting steel rope 211.

[0040] Servo motors 23 are fixedly installed at both ends of the test bench 1. Rotating rods 24 are fixedly installed at the drive output ends of both servo motors 23. The rotating rods 24 pass through and are fixedly connected to the winding roller 22. By starting the servo motors 23, the drive shafts of the servo motors 23 can rotate the rotating rods 24, which in turn rotate the winding roller 22, thus realizing the winding and unwinding of the steel rope 21. Support plates 25 are fixedly installed at both ends of the test bench 1. One end of the rotating rod 24 is rotatably connected to the support plate 25. Second sliders 27 are slidably installed at both ends of the test bench 1. Each of the second sliders 27 has a connecting rod 28 fixedly installed on its upper surface. One end of each of the two connecting rods 28 is fixedly installed with a guide sleeve 29. One end of the winding steel rope 21 passes through the guide sleeve 29 and makes movable contact with the inner wall of the guide sleeve 29. By setting the second slider 27, the connecting rod 28 and the guide sleeve 29, during the winding and unwinding process of the winding steel rope 21, the position change of the winding steel rope 21 can be caused by the guide sleeve 29 and the connecting rod 28 to make the second slider 27 slide horizontally on the test platform 1. The guide sleeve 29 can improve the stability of the winding and unwinding process of the winding steel rope 21.

[0041] The pressurizing device 3 includes a counterweight box 31, inside which are arranged several counterweight plates 32. By arranging multiple counterweight plates 32 inside the counterweight box 31, when the counterweight box 31 descends, the counterweight plates 32 descend synchronously. The counterweight box 31 and the counterweight plates 32 can press down on the expansion joint 5. Two cylinders 33 are fixedly arranged on the upper end face of the U-shaped frame 15. The upper end face of the counterweight box 31 is detachably mounted on the piston end of the two cylinders 33. By arranging the cylinders 33, when the piston end of the cylinders 33 extends... During the exhibition, the piston end of cylinder 33 can push the counterweight box 31 and counterweight plate 32 to descend vertically. The piston ends of both cylinders 33 are fixedly provided with mounting plates 34. Two mounting bolts 35 are threadedly mounted on both mounting plates 34. One end of the mounting bolts 35 is threadedly connected to the threaded hole on the upper end face of the counterweight box 31. By setting the mounting plates 34 and mounting bolts 35, it is easy to assemble the counterweight box 31 on the piston end of cylinder 33, and the counterweight box 31 can be disassembled at the same time.

[0042] A pressure plate 38 is slidably installed inside the counterweight box 31. The lower surface of the pressure plate 38 is in contact with the upper surface of one of the counterweight plates 32. By setting the pressure plate 38 and adjusting its height inside the counterweight box 31, different numbers of counterweight plates 32 can be added to the counterweight box 31, thus enabling different counterweights to be configured according to test requirements. Guide grooves 39 are provided on both sides of the counterweight box 31, and guide blocks 4 are fixedly installed on both sides of the pressure plate 38. The guide blocks 4 are slidably installed in the guide grooves. The inner wall of the pressure plate 38 is provided with a guide groove 39 and a guide block 4. The guide block 4 can slide vertically along the inner wall of the guide groove 39, thereby keeping the pressure plate 38 moving horizontally. A threaded rod 41 is rotatably installed on the upper end face of the counterweight box 31. One end of the threaded rod 41 is rotatably connected to the middle of the pressure plate 38. A knob 42 is fixedly installed on the other end of the threaded rod 41. By rotating the knob 42, the threaded rod 41 can be rotated, and the threaded rod 41 can drive the pressure plate 38 to move vertically up and down.

[0043] An anti-slip pad 36 is fixedly installed on the lower end face of the counterweight box 31. By setting the anti-slip pad 36, the stability of the counterweight box 31 after contact with the expansion joint 5 can be improved. A cover plate 37 is detachably installed on one side of the counterweight box 31. By setting the cover plate 37, the cover plate 37 is installed on one side of the counterweight box 31 by bolts, which makes it convenient for operators to put the counterweight plate 32 into the counterweight box 31.

[0044] Working principle: When it is necessary to test the stress of the expansion joint connection structure of the inverted T-shaped cap beam, the operator first disassembles the special-shaped steel single-slit expansion joint. First, remove the fixing bolts at the upper end of the special-shaped steel single-slit expansion joint to form two independent expansion joints 5. Then, weld the two expansion joints 5 to the pre-embedded steel bars 13 in the two reserved grooves 12 respectively. Then, pour concrete 52. The concrete 52 covers the two independent expansion joints 5 and fixes the expansion joints 5 in the reserved grooves 12. After the concrete 52 solidifies, filler 53 is filled into the gap between the two reserved grooves 12. Then, the rubber waterstop 51 is installed in the concave hole of the upper limiting steel strip of the two expansion joints 5 to complete the assembly of the special-shaped steel single-slit expansion joint.

[0045] Subsequently, the operators simultaneously turned on two servo motors 23. The drive shafts of the two servo motors 23 caused the two rotating rods 24 to rotate. The two rotating rods 24 caused the two winding steel ropes 21 to be wound up through the two winding rollers 22. The two winding steel ropes 21 pulled the two bridge decks 11 away from each other through the corresponding connecting steel ropes 211, applying a tension to the two expansion joints 5.

[0046] The operator starts two cylinders 33, and the piston ends of the two cylinders 33 extend, pushing the counterweight box 31 to descend vertically. Multiple counterweight plates 32 inside the counterweight box 31 descend synchronously. When the lower surface of the anti-slip pad 36 contacts the upper surface of the two expansion joints 5, the counterweight box 31 and multiple counterweight plates 32 press down on the two expansion joints 5, giving the two expansion joints 5 a downward pressure, and performing a pressure test on the two expansion joints 5.

[0047] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A stress testing device for an inverted T-shaped expansion joint connection structure, comprising a test bench (1), characterized in that: The upper surface of the test bench (1) is provided with two bridge decks (11), and each of the two bridge decks (11) has a reserved groove (12) at one end opposite to the other. The bottom surface of each of the two reserved grooves (12) is pre-embedded with a number of evenly distributed pre-embedded steel bars (13). The test bench (1) is provided with a tensile device (2), and a U-shaped frame (15) is fixedly provided on the upper surface of the test bench (1). A pressure device (3) is provided on the U-shaped frame (15). The tensioning device (2) includes two wound steel ropes (21). Both ends of the test platform (1) are provided with winding rollers (22). One of the wound steel ropes (21) is wound on a winding roller (22). The other ends of the two wound steel ropes (21) are fixedly provided with connecting steel ropes (211). One of the connecting steel ropes (211) is fixedly provided on one side of a bridge deck (11). Servo motors (23) are fixedly installed at both ends of the test bench (1), and rotating rods (24) are fixedly installed at the drive output ends of the two servo motors (23). The rotating rods (24) pass through the winding roller (22) and are fixedly connected to the winding roller (22). The pressurizing device (3) includes a counterweight box (31), and the interior of the counterweight box (31) is provided with several counterweight plates (32). Two cylinders (33) are fixedly installed on the upper end face of the U-shaped frame (15). The upper end face of the counterweight box (31) is detachably installed on the piston end of the two cylinders (33). The counterweight box (31) is slidably provided with a pressure plate (38). The lower surface of the pressure plate (38) is in contact with the upper surface of one of the counterweight plates (32). A threaded rod (41) is rotatably installed on the upper end face of the counterweight box (31). One end of the threaded rod (41) is rotatably connected to the middle part of the pressure plate (38).

2. The stress testing device for the expansion joint connection structure of an inverted T-shaped cap beam as described in claim 1, characterized in that, Two first sliders (14) are fixedly provided on the lower surface of both bridge panels (11), and the first sliders (14) are slidably disposed on the upper surface of the test bench (1).

3. The stress testing device for the expansion joint connection structure of an inverted T-shaped cap beam as described in claim 1, characterized in that, Both ends of the test bench (1) are fixedly provided with support plates (25), and one end of the rotating rod (24) is rotatably connected to the support plate (25).

4. The stress testing device for the expansion joint connection structure of an inverted T-shaped cap beam as described in claim 1, characterized in that, The test platform (1) is slidably mounted with a second slider (27) at both ends. A connecting rod (28) is fixedly provided on the upper surface of the two second sliders (27). A guide sleeve (29) is fixedly provided at one end of the two connecting rods (28). One end of the wound steel rope (21) passes through the guide sleeve (29) and makes contact with the inner wall of the guide sleeve (29).

5. The stress testing device for the expansion joint connection structure of an inverted T-shaped cap beam as described in claim 1, characterized in that, The piston ends of both cylinders (33) are fixedly provided with mounting plates (34), and two mounting bolts (35) are threadedly mounted on both mounting plates (34). One end of the mounting bolts (35) is threadedly connected to the threaded hole on the upper end face of the counterweight box (31).

6. The stress testing device for the expansion joint connection structure of an inverted T-shaped cap beam as described in claim 1, characterized in that, The lower end face of the counterweight box (31) is fixedly equipped with an anti-slip pad (36), and a cover plate (37) is detachably installed on one side of the counterweight box (31).

7. The stress testing device for the expansion joint connection structure of an inverted T-shaped cap beam as described in claim 1, characterized in that, The counterweight box (31) has guide grooves (39) on both sides, and guide blocks (4) are fixedly provided on both sides of the pressing plate (38). The guide blocks (4) are slidably disposed on the inner wall of the guide groove (39).

8. The stress testing device for the expansion joint connection structure of an inverted T-shaped cap beam as described in claim 1, characterized in that, A knob (42) is fixedly provided at the other end of the threaded rod (41).

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