A grating side sliding displacement type expansion joint device

Abstract

The application discloses a grating side sliding displacement type expansion joint device, mainly comprising a fixed cross beam, a sliding cross beam, a track beam and a plurality of rib strips, the fixed cross beam and the track beam are respectively arranged on the beam end concrete top surfaces on both sides of the expansion joint in the bridge transverse direction, and the fixed cross beam and the track beam are respectively welded with a plurality of groups of anchoring pieces embedded in the beam body concrete; a sliding groove is arranged on the top surface of the track beam, and the sliding cross beam is slidingly arranged in the sliding groove of the track beam; the plurality of rib strips are arranged in parallel between the fixed cross beam and the sliding cross beam, and each rib strip has an acute angle with the fixed cross beam and the sliding cross beam, and the two ends of each rib strip are rotationally connected with the fixed cross beam and the sliding cross beam through pin shafts, and the top surfaces of the rib strips are flush with the beam surfaces. The application has the advantages of large longitudinal and transverse displacement range of the expansion joint, good vehicle passing smoothness, low noise, difficulty in damage, and convenience in maintenance and repair.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, and relates to the construction of bridge expansion joints, specifically to a grid side-sliding displacement expansion joint device. Background Technology

[0002] Bridge expansion joints are flexible, deformable joint devices installed between the ends of beams in each span of a bridge structure and between the beam ends and the abutment backs to accommodate bridge structural deformation. Their function is to ensure the bridge structure can freely expand and deform under the influence of factors such as temperature changes, concrete shrinkage and creep, and load effects, resulting in a comfortable and smooth driving experience. The installation of expansion joint devices between bridge expansion joints is crucial for ensuring the safety, speed, and comfort of highway transportation, and should primarily meet the following requirements:

[0003] (1) It can adapt to the free expansion and contraction of the beam in the longitudinal direction and the free displacement in the transverse direction; (2) The vehicle should travel smoothly without sudden jumps or noise; (3) It should have a long service life; (4) It should be easy to maintain, inspect and repair.

[0004] Currently, the most commonly used expansion joint devices are comb-tooth plate expansion joints and modular expansion joints.

[0005] Common comb-plate type expansion joints, such as the "comb-plate type expansion joint" disclosed in CN216006609U and the "comb-plate type bridge expansion joint device" disclosed in CN216275204U, all include two comb-plates anchored to the top surfaces of two adjacent beam ends. The staggered teeth between the two comb-plates meet the expansion and contraction requirements of the bridge deck. Due to considerations for vehicle ride comfort, the tooth spacing in comb-plate type expansion joints cannot be set too large, thus limiting the amount of expansion and contraction they can accommodate, especially their poor adaptability to lateral and vertical displacement of the beam.

[0006] Common modular expansion joints, such as the "Modular Supported Bridge Expansion Joint Device" disclosed in CN209456883U, the "Bridge Limiting Control Modular Expansion Joint Device" disclosed in CN112942088A, and the "Overpass Widening Modular Expansion Joint Device" disclosed in CN 207469076 U, all include a split displacement box. The two ends of the displacement box are fixed to the two beam ends respectively. Multiple support beams are arranged in the bridge direction inside the displacement box. Two side beams are arranged in the bridge direction on the top surface of both ends of the displacement box. At least one middle beam is arranged in the bridge direction between the two side beams. The middle beam is supported on the support beams. A rubber sealing strip is arranged between the middle beam and the side beams. The aforementioned modular expansion joints can accommodate a large range of expansion and contraction, but due to the large displacement gap between the middle beam and the side beam, the ride comfort of vehicles is poor and the noise is high. Moreover, there are many load-bearing components in the displacement box, including rubber bearing supports and compression supports set on the top and bottom surfaces of the support beam. With tens of thousands of vehicle impacts every day, the internal rubber components are prone to fatigue failure, causing overall damage to the expansion joint.

[0007] The existing expansion joint devices mentioned above also generally suffer from inconvenience in maintenance, inspection, and repair; if a part is damaged, the entire device needs to be replaced. Summary of the Invention

[0008] The purpose of this invention is to address the aforementioned problems of existing expansion joint devices by providing a grid-side sliding displacement expansion joint device that, while satisfying the multi-directional displacement of the expansion joint, improves the smoothness of vehicle passage, reduces noise, extends the service life of the expansion joint device, and facilitates maintenance and repair.

[0009] The technical solution of the present invention is as follows:

[0010] A grid-type sliding displacement expansion joint device is characterized by: mainly comprising a fixed crossbeam, a sliding crossbeam, a track beam, and multiple ribs; the fixed crossbeam and the track beam are respectively arranged transversely on the top surface of the concrete at the beam ends on both sides of the expansion joint; multiple sets of anchors are welded to the fixed crossbeam and the track beam, and the anchors are cast into the concrete of the beam body; a sliding groove is provided at the top of the track beam, and the sliding crossbeam is slidably arranged in the sliding groove of the track beam; multiple ribs are arranged parallel between the fixed crossbeam and the sliding crossbeam, and the longitudinal axis of the multiple ribs forms an acute angle with the longitudinal axis of the fixed crossbeam and the sliding crossbeam, forming a parallelogram; each rib is rotatably connected to the fixed crossbeam and the sliding crossbeam at both ends by a pin, and the top surface of each rib is flush with the beam surface.

[0011] This invention features a simple structure with multiple ribs forming a parallelogram-shaped grid structure. Utilizing the principle of synchronous movement of the parallelogram, the ribs rotate synchronously to adapt to bridge deformation and expansion. Compared to existing comb-plate type expansion joint devices, this invention is more flexible in adapting to both longitudinal expansion and lateral displacement of the bridge deck, and has a wider range of expansion and contraction tolerances. Compared to existing modular expansion joints, the ribs of this invention are basically arranged along the bridge direction, resulting in better vehicle smoothness, increased comfort, and reduced noise during vehicle passage. The absence of easily fatigued rubber materials extends service life. The ribs adopt an assembled installation structure, making maintenance, inspection, repair, and replacement simple and convenient. Attached Figure Description

[0012] Figure 1 This is a longitudinal elevation view of the present invention.

[0013] Figure 2 This is a schematic diagram of the planar structure of the present invention;

[0014] Figure 3 This is a structural diagram of the anchor.

[0015] Figure 4 This is a schematic diagram of the planar structure of the fixed beam and the sliding beam;

[0016] Figure 5This is a schematic diagram of the planar structure of the track beam;

[0017] Figure 6 This is a cross-sectional view of the track beam;

[0018] Figure 7 This is a schematic diagram of the planar structure of the ribs;

[0019] Figure 8 It is the lateral elevation of the rib;

[0020] Figure 9 This is a structural diagram of the pin;

[0021] Figure 10 This is a cross-sectional view of the waterproof device;

[0022] Figure 11 This is a schematic diagram showing the rotation state of the ribs when the expansion joint contracts;

[0023] Figure 12 This is a schematic diagram showing the rotation state of the ribs when the expansion joint expands. Detailed Implementation

[0024] like Figure 1 , Figure 2 As shown, the present invention mainly includes a fixed crossbeam 1, a sliding crossbeam 2, a track beam 3, and multiple ribs 4. The fixed crossbeam 1 and the track beam 3 are respectively arranged transversely on the top surface of the concrete at the beam ends on both sides of the expansion joint 10. Multiple sets of anchors 5 are welded to the fixed crossbeam 1 and the track beam 3, and the anchors are poured into the concrete of the beam body 11. A groove is provided on the top of the track beam 3, and the sliding crossbeam 2 is slidably arranged in the groove of the track beam 3. Multiple ribs 4 are arranged parallel between the fixed crossbeam 1 and the sliding crossbeam 2, and the multiple ribs have acute angles with the fixed crossbeam and the sliding crossbeam, forming a parallelogram. The two ends of each rib are rotatably connected to the fixed crossbeam and the sliding crossbeam through pins 6, and the top surface of each rib is flush with the beam surface.

[0025] In the above structure, when the expansion joint 10 changes the distance between the fixed crossbeam 1 and the sliding crossbeam 2 due to the expansion and contraction of the beam 11, it will generate a longitudinal pressure or tension on the rib 4. Since the rib 4 has an acute angle with the fixed crossbeam 1 and the sliding crossbeam 2, each rib 4 can rotate around the pivot at one end of the fixed crossbeam 1, and each rib rotates synchronously, driving the sliding crossbeam 2 to slide left and right along the groove on the track beam 3, thereby adapting to the expansion and contraction of the expansion joint.

[0026] A smaller angle between the ribs and the fixed and sliding crossbeams facilitates smooth rotation of the ribs. However, considering the smoothness of vehicle passage, the angle between each rib and the fixed and sliding crossbeams should be as large as possible. Tests have shown that this device can rotate smoothly when the ends of the ribs are subjected to longitudinal pressure, provided the angle between the ribs and the fixed and sliding crossbeams does not exceed 70°. Therefore, in practical implementation, the angle between the ribs and the fixed and sliding crossbeams can be set to no more than 70°.

[0027] To prevent friction between adjacent ribs when they rotate, a certain gap is provided between them; at the same time, considering the smoothness of vehicle passage and dust prevention, the gap is sufficient to ensure that the ribs do not come into contact with each other when they rotate.

[0028] To prevent the ribs from being obstructed at both ends when they rotate, the end faces of each rib are made into outward-protruding arc surfaces.

[0029] like Figure 3 , Figure 4 As shown, the groove 31 on the track beam 3 is a C-shaped groove with the opening facing upwards. The track beam includes a base plate 32, with side plates 33 protruding upwards to a certain height on both sides of the base plate. Limiting plates 34 of a certain width extend from the upper ends of the side plates, forming the C-shaped groove 31. The width of the sliding crossbeam is less than the internal width of the groove but greater than the width of the groove opening, thus confining it within the groove.

[0030] like Figure 5 As shown, the top surfaces of the fixed crossbeam 1 and the sliding crossbeam 2 are respectively provided with shaft grooves 11 or 21 at equal intervals corresponding to the number of ribs;

[0031] like Figure 1 , Figure 2 and Figure 6 , Figure 7 , Figure 8 As shown, each rib 4 has a shaft hole 41 at both ends, and a pin 6 is inserted into each of the two shaft holes. The lower ends of the two pins are inserted into the shaft grooves on the fixed crossbeam and the sliding crossbeam, respectively.

[0032] In specific implementation, the longitudinal section of the shaft holes 41 at both ends of the rib 4 can be set as a T-shaped structure, with the upper half having a larger diameter than the lower half; correspondingly, a nut 61 is provided at the upper end of the pin 6, the diameter of which is larger than the diameter of the lower half of the shaft hole but smaller than the diameter of the upper half of the shaft hole. The nut is used to install the pin and to limit the rib to a certain extent, preventing it from bouncing due to vibration when a vehicle passes by.

[0033] like Figure 1 and Figure 9 As shown, each anchor 5 includes an anchor bar 51 and an anchor plate 52. The surface of the anchor plate is arranged along the bridge direction, one side of which is welded to the anchor bar, and the front end of the anchor plate is welded to the fixed crossbeam or track beam.

[0034] like Figure 1 and Figure 10 As shown, a waterproof device is provided in the expansion joint 10 below the rib 4. The waterproof device includes an arc-shaped rubber sheet 7 and two fixing frames 8. The two fixing frames 8 are respectively fixed in the concrete at the beam ends on both sides of the expansion joint. The arc-shaped rubber sheet 7 is fixedly connected to the two fixing frames 8 on both sides.

[0035] In specific implementation, the fixing frame 8 can be an angle steel, with one leg of the angle steel fixed in the concrete at the beam end, and the other leg protruding out of the concrete with the tip pointing upward. The two sides of the arc-shaped rubber sheet 7 are folded over the protruding edges of the two angle steels respectively, and are fastened and fixed by multiple U-shaped buckles 9.

[0036] The working principle of this expansion joint device is as follows:

[0037] like Figure 11 As shown, when the bridge expansion joint shrinks, the distance between the fixed crossbeam 1 and the sliding crossbeam 2 decreases accordingly, and the two ends of the rib 4 are squeezed by the longitudinal pressure F1. Since there is an acute angle α between the rib and the fixed crossbeam, and the fixed crossbeam is fixed, all the ribs rotate synchronously to the right around the axis of rotation at one end of the fixed crossbeam, while driving the sliding crossbeam to slide to the right along the track beam. The angle α between the rib and the fixed crossbeam decreases, thus adapting to the contraction of the expansion joint.

[0038] Conversely, such as Figure 12 As shown, when the expansion joint becomes larger, the distance between the fixed crossbeam and the track beam increases accordingly. The two ends of the rib 4 are pulled by the tension F2 along the bridge direction, causing all the ribs to rotate synchronously to the left around the axis of rotation at one end of the fixed crossbeam. At the same time, the sliding crossbeam slides to the left along the track beam, and the angle α between the rib and the fixed crossbeam increases, thus adapting to the contraction of the expansion joint.

[0039] When the beams undergo lateral displacement due to vehicle vibration, the sliding crossbeam can slide relative to the track beam in the transverse direction of the bridge, thereby adapting to the lateral displacement of the beams.

[0040] When vehicle vibration causes the bridge to vibrate vertically, the vertical vibration force of one end of the beam will not be transmitted to the other end because the pin is movably inserted into the shaft groove of the fixed beam and the sliding beam. This will not affect the welded structure of the fixed beam and the sliding beam with the anchor, thus avoiding structural damage to the expansion joint device.

[0041] In actual working conditions, when a vehicle passes through an expansion joint, the expansion joint will generally displace simultaneously in the longitudinal, lateral, and vertical directions due to the vehicle's weight and vibration. Regardless of whether the expansion joint expands or contracts longitudinally, or displaces laterally or vertically, the expansion joint device of this invention can adapt freely, thereby reducing the probability of damage to the expansion joint device and extending its service life.

[0042] In one experimental example of the present invention, the ribs are made of carbon steel bars with a cross section of 4×4, and the fixed crossbeam and the sliding crossbeam are made of steel bars with a cross section of 6×3. When subjected to the crushing of heavy vehicles with a load of more than 20T, the vehicles pass through smoothly with low noise and no obvious bouncing of the ribs. Moreover, as the traffic volume increases, the longer the axle rotates and the sliding crossbeam slides under friction, the smoother it becomes.

[0043] During bridge operation, the expansion joint device is inspected regularly. If a rib or a pivot is damaged, the damaged part can be replaced individually, making maintenance convenient.

Claims

1. A grid side-sliding displacement expansion joint device, characterized in that: The main components include a fixed crossbeam, a sliding crossbeam, a track beam, and multiple ribs. The fixed crossbeam and track beam are respectively installed transversely on the top surface of the concrete at the beam ends on both sides of the expansion joint. Multiple sets of anchors are welded to the fixed crossbeam and track beam, and the anchors are poured into the concrete of the beam body. A groove is provided on the top of the track beam, and the sliding crossbeam is slidably installed in the groove of the track beam. Multiple ribs are arranged parallel to the fixed crossbeam and the sliding crossbeam, and the longitudinal axis of the multiple ribs forms an acute angle with the longitudinal axis of the fixed crossbeam and the sliding crossbeam, forming a parallelogram. Each rib is rotatably connected to the fixed crossbeam and the sliding crossbeam at both ends by a pin, and the top surface of each rib is flush with the beam surface. The groove on the track beam is a C-shaped groove with the groove opening facing upwards. The width of the sliding crossbeam is smaller than the internal width of the groove but larger than the width of the groove opening. The top surfaces of the fixed and sliding crossbeams are respectively provided with shaft grooves at equal intervals corresponding to the number of ribs; each rib has a shaft hole at both ends, and a pin is inserted into each shaft hole, with the lower ends of the two pins inserted into the shaft grooves on the fixed and sliding crossbeams respectively; the longitudinal section of the shaft holes at both ends of the ribs is a T-shaped structure, with the upper half diameter being larger than the lower half; a nut is provided at the upper end of the pin, and the diameter of the nut is larger than the diameter of the lower half of the shaft hole but smaller than the diameter of the upper half of the shaft hole; the pins are movably inserted into the shaft grooves of the fixed and sliding crossbeams, so that the vertical vibration force of one end of the beam will not be transmitted to the other end.

2. The grid side-sliding displacement expansion joint device according to claim 1, characterized in that: The angle between each rib and the fixed and sliding crossbeams shall not exceed 70°.

3. The grid side-sliding displacement expansion joint device according to claim 1, characterized in that: There is a certain gap between adjacent ribs.

4. The grid side-sliding displacement expansion joint device according to claim 1, characterized in that: The end faces of each rib are outwardly protruding arc surfaces.

5. The grid side-sliding displacement expansion joint device according to claim 1, characterized in that: Each anchor includes an anchor bar and an anchor plate. The surface of the anchor plate is arranged along the bridge direction. One side of the anchor plate is welded to the anchor bar, and the front end of the anchor plate is welded to the fixed crossbeam or track beam.

6. The grid side-sliding displacement expansion joint device according to claim 1, characterized in that: The expansion joint device also has a waterproof structure located below the ribs. The waterproof structure includes an arc-shaped rubber sheet and two fixing frames. The two fixing frames are fixed in the concrete at the beam ends on both sides of the expansion joint. The arc-shaped rubber sheet is fixedly connected to the two fixing frames on both sides. The fixing frame is an angle steel. One leg of the angle steel is fixed in the concrete at the beam end, and the other leg protrudes out of the concrete with its tip pointing upwards. The two sides of the arc-shaped rubber sheet are folded over the protruding edges of the two angle steels and are fastened and fixed by multiple U-shaped buckles.

Images