阅读说明：本技术 一种桥梁伸缩缝的锚固组件 (Anchor subassembly in bridge expansion joint ) 是由 郭晓辉 周科 王印西 郭辉伟 古世先 郑延辉 张小豪 于 2021-09-14 设计创作，主要内容包括：本发明涉及桥梁技术领域,尤其涉及一种桥梁伸缩缝的锚固组件,解决了现有技术中传统的桥梁伸缩缝的锚固装置结构较为简单,不够牢固,而且由于锚固装置本身也要承受一部分重量的问题。一种桥梁伸缩缝的锚固组件,包括伸缩缝以及伸缩缝一侧的梁体一,另一侧的梁体二,伸缩缝的顶部一侧设置有顶板,梁体一和梁体二与顶板相对应侧一侧均开设有与顶板两侧相适配的顶板滑槽,顶板的两侧的两端部均固定连接有与顶板滑槽相适配滑动连接的滑杆,梁体一的一侧通过双层板与梁体二连接,伸缩缝的两端均水平设置有连接筒。本发明连接套筒提高了其抗压型和牢固性,降低了锚固装置本身受到的重量。(The invention relates to the technical field of bridges, in particular to an anchoring assembly for a bridge expansion joint, which solves the problems that the traditional anchoring device for the bridge expansion joint in the prior art is simple in structure and not firm enough, and the anchoring device needs to bear a part of weight. The utility model provides an anchor subassembly at bridge expansion joint, the roof beam body one including expansion joint and expansion joint one side, the roof beam body two of opposite side, top one side at expansion joint is provided with the roof, roof beam body one and roof beam body two all set up with roof board both sides looks adaptation one side roof spout, the equal fixedly connected with in both ends of the both sides of roof and roof spout looks adaptation sliding connection's slide bar, one side of roof beam body one is passed through the double-deck slab and is connected with roof beam body two, the equal level in both ends of expansion joint is provided with the connecting cylinder. The connecting sleeve improves the compression resistance and firmness of the connecting sleeve, and reduces the weight of the anchoring device.)

1. An anchoring assembly of a bridge expansion joint comprises an expansion joint (1), a first beam body (2) at one side of the expansion joint (1) and a second beam body (6) at the other side of the expansion joint (1), and is characterized in that a top plate (3) is arranged at one side of the top of the expansion joint (1), top plate sliding grooves (12) matched with the two sides of the top plate (3) are formed in one sides of the first beam body (2) and the second beam body (6) corresponding to the top plate (3), sliding rods matched with the top plate sliding grooves (12) and in sliding connection are fixedly connected to the two end portions of the two sides of the top plate (3), one side of the first beam body (2) is connected with the second beam body (6) through a double-layer plate (9), connecting cylinders (5) are horizontally arranged at the two ends of the expansion joint (1), and connecting parts (4) are arranged at the two ends of the connecting cylinders (5);

the roof plate (3) comprises a plurality of expansion sections (301) and a plurality of rigid sections (302), the expansion sections (301) and the rigid sections (302) are fixedly connected at intervals, an air cavity (303) is arranged in the expansion section (301), the expansion section (301) is made of flexible materials, a ventilation pipeline for supplying air and exhausting air to the air cavity (303) is arranged in the rigid section (302), an exchange cavity (304) is arranged in the position, corresponding to the connecting cylinder (5), of the end portion of the roof plate (3), the exchange cavity (304) is communicated with the ventilation pipeline and provided with an exhaust port (305), a containing cavity (306) is communicated with the exchange cavity (304), an air bag (307) is arranged in the containing cavity (306), the air bag (307) is communicated with the ventilation pipeline, and a moving block (308) is communicated with the containing cavity (306) in the exchange cavity (304), one side of the moving block (308) is arranged in a manner of being extruded with the air bag (307);

when the moving block (308) is in a state of compressing an air bag (307), the exhaust port (305) is shielded by the moving block (308);

when the moving block (308) is in a non-compression air bag (307) state, the exhaust port (305) is not shielded by the moving block (308);

the two ends of the expansion joint (1) are provided with self-inflating parts (13) corresponding to the connecting part (4), each self-inflating part (13) comprises a first wedge-shaped block (131) fixedly connected with the two ends of the connecting part (4), a second wedge-shaped block (132) is arranged above the first wedge-shaped block (131), the inclined plane of the second wedge-shaped block (132) is abutted to the inclined plane of the first wedge-shaped block (131), the second wedge-shaped block (132) is arranged at a right angle to the first wedge-shaped block (131), a connecting rod (133) is arranged between the second wedge-shaped block (132) and the moving block (308), the exchange cavity (304) is matched with the connecting rod (133) and is provided with a moving groove (309) along the axial direction of the connecting cylinder (5), and the first beam body (2) and the second beam body (6) are both matched with the self-inflating parts (13) and are provided with a shock-relieving cavity (134), the cushioning cavity (134) is communicated with the sliding groove of the top plate (3), the first wedge-shaped block (131) is connected with the cushioning cavity (134) in a sliding mode, and the depth of the sliding groove of the top plate (3) is larger than that of the cushioning cavity (134).

2. The anchoring assembly for a bridge expansion joint according to claim 1, wherein a plug board (11) which is formed by inserting a double-layer board (9) in a matched manner is fixedly connected to one side of the second beam body (6) corresponding to the first beam body (2), and one side of the plug board (11) is elastically connected with the first beam body (2) through a plurality of extrusion springs (10).

3. The anchoring assembly for a bridge expansion joint according to claim 2, wherein one side of the top of the double-layer plate (9) is slidably connected with a plurality of second sliding blocks (8) fixedly connected with the bottom of the top plate (3), and one side of the top of the insertion plate (11) is slidably connected with a plurality of first sliding blocks (7) fixedly connected with the bottom of the top plate (3).

4. The anchoring assembly for the bridge expansion joint according to claim 1, wherein the connecting member (4) comprises a first sleeve (402), a second extrusion spring (401) and connecting plates (403), the first sleeve (402) is sleeved on one side of an outer ring of the second extrusion spring (401), one end of the second extrusion spring (401) is elastically connected with one side of an inner cavity of the connecting cylinder (5), one ends of the first sleeves (402), which are far away from the second extrusion spring (401), are respectively connected with side walls of a first beam body (2) and a second beam body (6), two connecting plates (403) are arranged, the two connecting plates (403) are symmetrically connected with two sides of the first sleeve (402), and two slots which are matched with the connecting plates (403) are formed in inner side walls at two ends of the connecting cylinder (5);

connecting part (4) still include cylinder (406), T shape slider (405) and plectane (404), T shape slider (405) are provided with two, and two mutual symmetry of T shape slider (405) sets up the both sides at cylinder (406), one side and the one end elastic connection of two (401) of extrusion spring of plectane (404), the end connection of a plurality of pole two (413) and two T shape sliders (405) is passed through to the opposite side, T shape spout (412) with T shape slider (405) looks adaptation are all seted up to the both sides of cylinder (406).

5. The anchoring assembly for a bridge expansion joint according to claim 4, wherein a second circular plate (408) is disposed at an end of the cylinder (406) far from the first circular plate (404), the second circular plate (408) is connected with the two T-shaped sliders (405) through the first circular rods (407), and one side of the second circular plate (408) far from the cylinder (406) is elastically connected with an inner side wall of the connecting cylinder (5) through the third compression spring (410).

6. The anchoring assembly for a bridge expansion joint according to claim 5, wherein two sides of the cylinder (406) are connected with the inner side wall of the connecting cylinder (5) through a plurality of fixing rods (411), and one side of the outer ring of the third compression spring (410) is sleeved with a second sleeve (409) fixedly connected with the inner side wall of the connecting cylinder (5).

Technical Field

The invention relates to the technical field of bridges, in particular to an anchoring assembly for a bridge expansion joint.

Background

Bridge expansion joints: it is referred to that in order to meet the requirement of deck deformation, expansion joints are usually provided between two beam ends, between a beam end and an abutment, or at the hinge joint of a bridge. The expansion joint is required to be freely telescopic in two directions parallel to and perpendicular to the axis of the bridge, and the expansion joint is firm and reliable, and when a vehicle runs, the vehicle is smooth and free of sudden jump and noise; the rainwater and garbage soil can be prevented from infiltration and blocking; the installation, the inspection, the maintenance and the dirt elimination are all simple and convenient. At the position of the expansion joint, the handrail and the bridge deck pavement are disconnected.

Chinese patent publication No. CN108265622A discloses a vibration-damping comb-tooth type expansion joint device, which comprises a vibration-damping waterproof soft cushion layer, a comb plate, an anchor bolt, a pull rod assembly, an end supporting metal plate, a cement base and the like. Pass through the bridge expansion joint at vehicle load, the fishback upwarps the vibration in-process, and asymmetric vibration can effectively be weakened to this type expansion joint, weakens anchor bolt department and receives the pull-up force to the rear portion is to the impact extrusion of cement base when buffering fishback upwarps, thereby the protection cement base does not produce the destruction that drops.

Chinese patent publication No. CN 109457602 a discloses a telescopic device for a durable dust-proof sliding plate of a bridge and a construction method thereof, which includes an expansion joint component and a telescopic plate, wherein one end of the telescopic plate is fixed at one side of the expansion joint component through an anchor bolt, and the other end of the telescopic plate is tightly attached to the other side of the expansion joint component and covers the expansion joint of the expansion joint component. According to the durable dustproof sliding plate telescopic device for the bridge, when a beam body is stretched and deformed, the comb-shaped steel plate slides along with the comb-shaped steel plate, and the telescopic plate also slides along with the comb-shaped steel plate, so that the self-stretching of the telescopic plate is realized; the expansion joint is covered by the expansion plate, so that the dustproof effect is achieved, the water stop belt can be prevented from being aged due to sunshine, the service life of an expansion joint assembly is prolonged, and the top of the expansion plate is flush with the top of concrete pouring, so that the bridge deck is flat, and the driving comfort is good; one end of the expansion plate is designed to be a wedge-shaped structure, sand particles cannot be accumulated at the expansion joint, and the long-term normal work of the expansion joint is guaranteed.

The bridge expansion joint is used for adjusting displacement and connection between upper structures caused by vehicle load and bridge building materials, but the traditional anchoring device of the bridge expansion joint is simple in structure and not firm enough, and the anchoring device is required to bear a part of weight, and is often fixed through a steel bar structure, wherein steel bars are also provided with a convex structure, and the phenomenon that safety accidents are caused by puncturing tires easily occurs when an upper shielding plate drops.

Disclosure of Invention

The invention aims to provide an anchoring assembly for a bridge expansion joint, which solves the problems that the traditional anchoring device for the bridge expansion joint in the prior art has a simpler structure and is not firm enough, and the anchoring device needs to bear a part of weight.

In order to achieve the purpose, the invention adopts the following technical scheme:

an anchoring assembly of a bridge expansion joint comprises the expansion joint, a first beam body at one side of the expansion joint, and a second beam body at the other side of the expansion joint, wherein a top plate is arranged at one side of the top of the expansion joint, top plate sliding grooves matched with the two sides of the top plate are respectively formed in one sides of the first beam body and the second beam body, which correspond to the top plate, two end parts of the two sides of the top plate are respectively and fixedly connected with a sliding rod matched and slidably connected with the top plate sliding grooves, one side of the first beam body is connected with the second beam body through a double-layer plate, two ends of the expansion joint are respectively and horizontally provided with a connecting cylinder, and two ends of the connecting cylinder are respectively provided with a connecting part;

the top plate comprises a plurality of expansion sections and a plurality of rigid sections, the expansion sections and the rigid sections are fixedly connected at intervals, air cavities are arranged in the expansion sections, the expansion sections are made of flexible materials, vent pipelines used for supplying and exhausting air to and from the air cavities are arranged in the rigid sections, exchange cavities are arranged in the positions, corresponding to the connecting cylinders, of the end portions of the top plate, the exchange cavities are communicated with the vent pipelines and provided with exhaust ports, accommodating cavities are communicated in the exchange cavities, air bags are arranged in the accommodating cavities and communicated with the vent pipelines, moving blocks are arranged in the exchange cavities and the accommodating cavities in a penetrating mode, and one sides of the moving blocks are arranged in a squeezing mode with the air bags;

when the moving block is in a state of compressing the air bag, the exhaust port is shielded by the moving block;

when the moving block is in a non-compression air bag state, the exhaust port is not shielded by the moving block;

the expansion joint both ends correspond adapting unit position is provided with from parts of aerifing, from parts of aerifing include with adapting unit both ends fixed connection's first wedge, the top of first wedge is provided with the second wedge, the inclined plane of second wedge with the inclined plane butt setting of first wedge, just the second wedge with first wedge is the right angle setting, the second wedge with be provided with the connecting rod between the movable block, the cooperation of exchange chamber the connecting rod is followed the connecting cylinder axial is provided with the shifting chute, roof beam body one with roof beam body two all cooperates from parts of aerifing is provided with the bradyseism chamber, bradyseism chamber and roof spout intercommunication setting, just first wedge with the bradyseism chamber slides and is connected, the degree of depth of roof spout is greater than the degree of depth in bradyseism chamber.

Preferably, one side of the beam body II corresponding to the beam body I is fixedly connected with an insertion plate which is matched and inserted with the double-layer plate, and one side of the insertion plate is elastically connected with the beam body I through a plurality of first extrusion springs.

Preferably, one side of the top of the double-layer plate is slidably connected with a plurality of second sliding blocks fixedly connected with the bottom of the top plate, and one side of the top of the inserting plate is slidably connected with a plurality of first sliding blocks fixedly connected with the bottom of the top plate.

Preferably, the connecting part comprises a first sleeve, a second extrusion spring and connecting plates, the first sleeve is sleeved on one side of an outer ring of the extrusion spring, one end of the second extrusion spring is elastically connected with one side of an inner cavity of the connecting cylinder, one ends of the first sleeves, far away from the second extrusion spring, are respectively connected with the side walls of the first beam body and the second beam body, the two connecting plates are symmetrically connected to two sides of the first sleeve, and two slots matched with the connecting plates are formed in the inner side walls of the two ends of the connecting sleeve;

adapting unit still includes cylinder, T shape slider and plectane one, T shape slider is provided with two, and two the mutual symmetry of T shape slider sets up in the cylindrical both sides, one side of plectane one and the one end elastic connection of extrusion spring two, the opposite side is through the end connection of a plurality of round bar two and two T shape sliders, the T shape spout with T shape slider looks adaptation is all seted up to the cylindrical both sides.

Preferably, one end, far away from the circular plate I, of the cylinder is provided with a circular plate II, the circular plate II is connected with the T-shaped sliding blocks through two circular rods I, and one side, far away from the cylinder, of the circular plate II is elastically connected with an inner side wall of the connecting cylinder through an extrusion spring III.

Preferably, the two sides of the cylinder are connected with the inner side wall of the connecting cylinder through a plurality of fixing rods, and one side of the outer ring of the third extrusion spring is sleeved with a second sleeve fixedly connected with the inner side wall of the connecting cylinder.

The invention has at least the following beneficial effects:

when the roof beam body one and two atress shrink of roof beam body are close to, the plugboard slides in double-deck board, make extrusion spring one atress deformation, absorb and buffer partly effort, the roof slides at the top of double-deck board and plugboard through slider one and slider two simultaneously, the support nature to the roof plate has also been improved simultaneously, and simultaneously, the pressure that extrusion spring two absorbed and buffered and received, the plectane drives T shape slider and slides in T shape spout, make plectane two to the three-way removal of extrusion spring, extrusion spring three is buffering the effort after that, connecting sleeve has improved its resistance to compression type and fastness, the weight that anchor itself received has been reduced, and the roof has effectively avoided the reinforcing bar to expose, the security has been improved.

The invention also has the following beneficial effects:

1. through the arrangement of the sleeve I, the extrusion spring II and the connecting plate of the connecting part, when the beam body I and the beam body II are stressed and contracted, the extrusion spring II absorbs and buffers the stress, the structure is compact, the buffering effect is good, the compression resistance and the firmness of the connecting sleeve are improved, and the weight of the anchoring device is reduced;

2. when the first beam body and the second beam body are expanded, the moving block is controlled to move to leak the exhaust port through the self-inflating component, air in an air cavity in the expansion section can be discharged from the exhaust port at the moment, the rigid sections positioned on two sides of the expansion section can expand towards the space where the original expansion section is positioned when the expansion section expands due to the flexible material of the expansion section at the moment, so that the length of the top plate for the rigid section to stretch and retract is formed, a moving space is provided for the expansion and expansion of the top plate, and more expansion and moving spaces are provided for the first beam body and the second beam body at the same time, so that the situation that the top plate is broken due to the fact that the yield space in the top plate sliding groove is not enough and the top plate is extruded when the expansion space required by the first beam body and the second beam body in the expansion process is not enough is avoided;

3. the first beam body and the second beam body can generate vibration vertical to the surface of the first beam body, particularly the top plate between the expansion joint of the first beam body and the second beam body, the vibration can be larger, when the top plate and the second beam body are subjected to vibration vertical to the surface of the second beam body, the vibration can be transmitted to the second wedge-shaped block through the moving rod, the second wedge-shaped block can vibrate up and down, the first wedge-shaped block and the first wedge-shaped block are in a state of being mutually attached on an inclined plane, the vibration in the vertical direction of the second wedge-shaped block can be transmitted to the first wedge-shaped block, the vibration in the vertical direction can be converted into vibration in the horizontal direction at the moment, and the vibration is horizontal vibration in the axial direction of the connecting cylinder, so the second extrusion spring and the third extrusion spring can absorb the vibration in the horizontal direction, namely, the connecting part can be matched with the self-inflating part to absorb the vibration in the vertical direction received by the top plate, the first beam body and the second beam body, the effect of cushioning is achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a double-layer plate structure according to the present invention;

FIG. 3 is a schematic view of a connector barrel according to the present invention;

FIG. 4 is a schematic view of a connecting member according to the present invention;

FIG. 5 is a schematic cross-sectional view of a top plate according to a second embodiment of the present invention;

fig. 6 is a partially enlarged schematic view of a portion a in fig. 5.

In the figure: 1. an expansion joint; 2. a first beam body; 3. a top plate; 301. an expansion section; 302. a rigid section; 303. an air cavity; 304. an exchange chamber; 305. an exhaust port; 306. an accommodating chamber; 307. an air bag; 308. a moving block; 309. a moving groove; 4. a connecting member; 401. a second spring is extruded; 402. a first sleeve; 403. a connecting plate; 404. a circular plate I; 405. a T-shaped slider; 406. a cylinder; 407. a first round rod; 408. a second circular plate; 409. a second sleeve; 410. a third spring is extruded; 411. fixing the rod; 412. a T-shaped chute; 413. a second round bar; 5. a connecting cylinder; 6. a second beam body; 7. a first sliding block; 8. a second sliding block; 9. a double-layer plate; 10. a first spring is extruded; 11. a plugboard; 12. a top plate chute; 13. a self-inflating component; 131. a first wedge; 132. a second wedge; 133. a connecting rod; 134. a cushioning cavity.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The first embodiment is as follows:

referring to fig. 1-4, an anchoring assembly for a bridge expansion joint comprises an expansion joint 1, a first beam body 2 at one side of the expansion joint 1, and a second beam body 6 at the other side, wherein a top plate 3 is arranged at one side of the top of the expansion joint 1, top plate chutes 12 matched with two sides of the top plate 3 are respectively arranged at one sides of the first beam body 2 and the second beam body 6 corresponding to the top plate 3, and in order to prevent the top plate 3 from becoming a barrier for the first beam body 2 and the second beam body 6 in the expansion process, an abdicating space is arranged in the sliding groove 12, namely, an abdicating space exists between the bottom wall of the top plate sliding groove 12 and the side surface of the top plate 3, two end parts of two sides of the top plate 3 are fixedly connected with sliding rods which are matched and slidably connected with the top plate sliding groove 12, one side of the beam body I2 is connected with the beam body II 6 through a double-layer plate 9, two ends of the expansion joint 1 are horizontally provided with connecting cylinders 5, and two ends of each connecting cylinder 5 are provided with connecting parts 4;

the connecting part 4 comprises a first sleeve 402, a second extrusion spring 401 and two connecting plates 403, the first sleeve 402 is sleeved on one side of the outer ring of the second extrusion spring 401, one end of the second extrusion spring 401 is elastically connected with one side of the inner cavity of the connecting cylinder 5, one ends of the first sleeves 402 far away from the second extrusion spring 401 are respectively connected with the side walls of the first beam body 2 and the second beam body 6, the two connecting plates 403 are arranged, and the two connecting plates 403 are symmetrically connected with the two sides of the first sleeve 402, the inner side walls of the two ends of the connecting cylinder 5 are both provided with two slots matched with the connecting plates 403, through the arrangement of the sleeve one 402, the pressing spring two 401 and the connecting plate 403 of the connecting part 4, when the first beam body 2 and the second beam body 6 are stressed to contract, the second extrusion spring 401 absorbs and buffers the stress, the compression resistance and firmness of the connecting cylinder 5 are improved, and the weight of the anchoring device is reduced.

The scheme has the following working processes:

when the first beam body 2 and the second beam body 6 are stressed and contracted to be close to each other, the plug board 11 slides in the double-layer board 9, the first extrusion spring 10 is stressed and deformed, part of acting force is absorbed and buffered, meanwhile, the top board 3 slides at the tops of the double-layer board 9 and the plug board 11 through the first slider 7 and the second slider 8, meanwhile, the supporting performance of the top board 3 is also improved, meanwhile, the second extrusion spring 401 absorbs and buffers the received pressure, the first circular board 404 drives the T-shaped slider 405 to slide in the T-shaped sliding groove 412, the second circular board 408 moves towards the third extrusion spring 410, the third extrusion spring 410 buffers the acting force, the connecting cylinder 5 improves the compression resistance and the firmness, the weight of the anchoring device is reduced, the top board 3 effectively avoids steel bar exposure, and the safety is improved.

According to the working process, the following steps are known:

through the arrangement of the first sleeve 402, the second extrusion spring 401 and the connecting plate 403 of the connecting part 4, when the first beam body 2 and the second beam body 6 are stressed to shrink, the second extrusion spring 401 absorbs and buffers the stress, the connecting cylinder 5 improves the compression resistance and firmness, and reduces the weight of the anchoring device.

Further, the plugboard 11 that one side fixedly connected with double-deck board 9 looks adaptation grafting of roof beam body two 6 and roof beam body 2 are corresponding, one side of plugboard 11 through a plurality of extrusion spring 10 and roof beam body 2 elastic connection, and is concrete, through the setting of double-deck board 9, plugboard 11 and extrusion spring 10, can effectively cushion the effort.

Preferably, top one side sliding connection of double-deck board 9 has a plurality of and roof 3 bottom fixed connection's slider two 8, and top one side sliding connection of plugboard 11 has a plurality of and roof 3 bottom fixed connection's slider 7, and is concrete, through the setting of slider one 7 and slider two 8, roof 3 slides at double-deck board 9 and plugboard 11's top through slider one 7 and slider two 8, has also improved the support nature to roof 3 simultaneously.

Preferably, the connecting component 4 further includes a cylinder 406, a T-shaped slider 405 and a first circular plate 404, the number of the T-shaped sliders 405 is two, the two T-shaped sliders 405 are symmetrically arranged on two sides of the cylinder 406, one side of the first circular plate 404 is elastically connected with one end of a second extrusion spring 401, the other side of the first circular plate 404 is connected with end portions of the two T-shaped sliders 405 through a plurality of second circular rods 413, T-shaped sliding grooves 412 matched with the T-shaped sliders 405 are formed in two sides of the cylinder 406, and specifically, through the arrangement of the cylinder 406, the T-shaped sliders 405 and the first circular plate 404, acting force is further buffered through sliding of the T-shaped sliders 405.

Preferably, a second circular plate 408 is provided at an end of the cylinder 406 remote from the first circular plate 404, the second circular plate 408 is connected to the two T-shaped sliders 405 through the first circular rods 407, a side of the second circular plate 408 remote from the cylinder 406 is elastically connected to an inner sidewall of the connecting cylinder 5 through a third pressing spring 410, the second circular plate 408 moves in the direction of the third pressing spring 410, and the third pressing spring 410 then buffers the acting force.

Preferably, two sides of the cylinder 406 are connected with the inner side wall of the connecting cylinder 5 through a plurality of fixing rods 411, and one side of the outer ring of the third extrusion spring 410 is sleeved with a second sleeve 409 fixedly connected with the inner side wall of the connecting cylinder 5.

Example two:

considering that not only the expansion of the first beam body 2 and the second beam body 6 but also the influence of the expansion of the top plate 3 on the first beam body 2 and the second beam body 6 need to be considered in the using process, the top plate 3 needs to be modified to a certain extent in the using process.

Referring to fig. 5 and 6, the top plate 3 includes a plurality of expansion sections 301 and a plurality of rigid sections 302, in this embodiment, one expansion section 301 and two rigid sections 302 are provided, and the two rigid sections 302 are symmetrically distributed on two sides of the expansion section 301, and the direction in which the expansion sheets and the rigid sections 302 are sequentially arranged is set along the axial direction of the connecting cylinder 5. The expansion section 301 and the rigid sections 302 are fixedly connected at intervals, an air cavity 303 is arranged in the expansion section 301, the expansion section 301 is made of flexible materials, a ventilation pipeline used for supplying air and exhausting air to the air cavity 303 is arranged in the rigid section 302, an exchange cavity 304 is arranged in the position, corresponding to the connecting cylinder 5, of the end portion of the top plate 3, the exchange cavity 304 is communicated with the outside, an exhaust port 305 is arranged in the exchange cavity 304 and communicated with the ventilation pipeline, an accommodating cavity 306 is communicated with the exchange cavity 304, an air bag 307 is arranged in the accommodating cavity 306, the air bag 307 is communicated with the ventilation pipeline, a moving block 308 is arranged in the exchange cavity 304 and the accommodating cavity 306 in a penetrating manner, and one side of the moving block 308 is arranged in a squeezing manner with the air bag 307;

when the moving block 308 is in a state of compressing the air bag 307, the exhaust port 305 is shielded by the moving block 308;

when the moving block 308 is in the state of the non-compression balloon 307, the exhaust port 305 is not blocked by the moving block 308.

The expansion of the top plate 3 is primarily due to the thermal expansion of the rigid section 302, such that when the first beam 2 and the second beam 6 are expanded, the moving block 308 can be controlled to move to leak the air outlet 305, at this time, the air in the air chamber 303 in the expansion section 301 can be exhausted from the air outlet 305, at this time, due to the flexible material of the expansion section 301, the rigid sections 302 at both sides of the expansion section 301 can expand towards the space where the original expansion section 301 is located when expanding, thereby, the length of the top plate 3 for the rigid section 302 to stretch and contract is generated, thereby providing a moving space for the expansion and expansion of the top plate 3, and simultaneously providing more expansion and moving spaces for the first beam body 2 and the second beam body 6, thereby avoid the not enough roof beam body 2 and the roof beam body 6 of giving way space in the 3 spouts of roof to extrude the roof 3 and cause the condition emergence of roof 3 fracture when the required expansion space of inflation in-process is not enough.

When the first beam body 2 and the second beam body 6 are restored, the moving block 308 can be controlled to press the air bag 307, at this time, the exhaust port 305 is firstly blocked by the moving block 308, then the moving block 308 presses the air bag 307 and moves, at this time, the air in the air bag 307 moves into the air cavity 303 of the expansion section 301 through the vent pipeline, so that the air in the expansion section 301 is filled with the air again, and the surfaces of the expansion section 301 and the rigid section 302 are restored to be in a flush state.

Further considering the cost of manpower and material resources, the self-inflation of the air cavity 303 in the expansion section 301 needs to be realized, so that the self-inflation parts 13 are arranged at the two ends of the expansion joint 1 corresponding to the positions of the connecting part 4, the self-inflation parts 13 comprise first wedge blocks 131 fixedly connected with the two ends of the connecting part 4, namely, the first wedge blocks 131 are fixedly arranged on the opposite end surfaces of the first sleeve 402 and the second sleeve 409, the second wedge blocks 132 are arranged above the first wedge blocks 131, the inclined surfaces of the second wedge blocks 132 are abutted against the inclined surfaces of the first wedge blocks 131, the second wedge blocks 132 and the first wedge blocks 131 are arranged in a right angle, the connecting rods 133 are arranged between the second wedge blocks 132 and the moving blocks 308, the exchange cavity 304 is provided with the moving grooves 309 along the axial direction of the connecting cylinder 5 in cooperation with the connecting rods 133, the first beam body 2 and the second beam body 6 are provided with the cushioning cavity 134 in cooperation with the self-inflation parts 13, and the first wedge blocks 131 are connected with the cushioning cavity 134 in a sliding manner, the depth of the top plate 3 chute is greater than the depth of the cushioning cavity 134.

When the temperature is low, the first beam body 2 and the second beam body 6 do not expand, and the moving block 308 is in a state of shielding the exhaust hole and compressing the air bag 307; when the temperature is high, the beam body I2 and the beam body II 6 expand, and the moving block 308 is in a state of not shielding the exhaust hole and not compressing the air bag 307;

therefore, when the temperature rises, the first beam body 2 and the second beam body 6 begin to expand, at this time, the cushioning cavities 134 on the first beam body 2 and the second beam body 6 push the second wedge-shaped block 132 and the first wedge-shaped block 131 to move towards the connecting part 4 together, at this time, the second wedge-shaped block 132 drives the connecting rod 133 to move in the moving groove 309, the moving block 308 is driven by the moving rod to be separated from a state of shielding the exhaust hole and compressing the air bag 307, the exhaust hole is leaked after the air bag 307 is deformed again, and at this time, the air in the air cavity 303 in the expansion section 301 is exhausted;

when the temperature is reduced, the first beam body 2 and the second beam body 6 gradually recover to deform, at this time, under the action of the second extrusion spring 401 and the third extrusion spring 410, the first sleeve 402 and the second sleeve 409 push the first wedge-shaped block 131 to move, at this time, the first wedge-shaped block 131 drives the second wedge-shaped block 132 to move, so that the moving block 308 moves along with the second wedge-shaped block 132, namely, the moving block 308 shields the exhaust port 305 and starts to compress the air bag 307 to move, after the moving block 308 finishes moving, the air in the air bag 307 is compressed into the air cavity 303 of the expansion section 301, and the surface of the expansion section 301 recovers to be flush with the rigid section 302.

Further, considering that when a vehicle or a pedestrian passes over the bridge, the first beam 2 and the second beam 6 may generate vibration perpendicular to the surface of the first beam 2, particularly the top plate 3 located between the first beam 2 and the second beam 6 at the expansion joint 1, the vibration may be larger, when the top plate 3 and the first beam 2 receive vibration perpendicular to the surface of the beam, the vibration may be transmitted to the second wedge 132 through the moving rod, the second wedge 132 may vibrate up and down, the first wedge 131 and the first wedge 131 are in a state where the inclined surfaces are attached to each other, at this time, the vibration in the vertical direction of the second wedge 132 may be transmitted to the first wedge 131, at this time, the vibration in the vertical direction may be converted into vibration in the horizontal direction, and the vibration in the horizontal direction along the axial direction of the connecting cylinder 5 may be absorbed by the second compression spring 401 and the third compression spring 410, that is, the connecting part 4 can absorb the vertical vibration received by the top plate 3, the first beam body 2 and the second beam body 6 by matching with the self-inflating part 13, and a cushioning effect is achieved.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.