Seamless expansion device, bridge deck expansion joint structure and paving method of bridge deck expansion joint structure

Abstract

The invention relates to the technical field of bridge expansion and contraction devices, in particular to a seamless expansion and contraction device, a bridge floor expansion and contraction joint structure and a paving method thereof.The seamless expansion and contraction device comprises two sets of displacement box bodies, a joint crossing plate and a reinforcing piece, and displacement sliding grooves are horizontally formed in the opposite sides of the two displacement box bodies; the joint crossing plate abuts against the upper end face of the displacement box body, connecting pieces slidably connected to the displacement sliding grooves are arranged on the two sides of the joint crossing plate so that the joint crossing plate can slide relative to the displacement box body, each reinforcing piece comprises a reinforcing pipe, a reinforcing rod, an inclined supporting rod and an elastic piece, the reinforcing pipes are arranged on the displacement box body or the beam body, the reinforcing pipes are vertically arranged, and the inclined supporting rod is arranged between the reinforcing pipes. The reinforcing rod is inserted into the reinforcing pipe in a sliding mode in the axial direction, one end of the inclined supporting rod is hinged to the lower end face of the middle of the seam crossing plate, the other end of the inclined supporting rod is hinged to the reinforcing rod, and the elastic piece is arranged between the reinforcing pipe and the reinforcing rod. The joint-crossing steel plate has the effect of improving the structural strength of the joint-crossing steel plate.

Description

Technical Field

[0001] The present application relates to the technical field of bridge expansion devices, and in particular to a seamless expansion device, a bridge deck expansion joint structure and a paving method thereof. Background Art

[0002] The bridge expansion device is a mechanism that is set between the two beam end faces and between the beam end face and the abutment to adapt to the expansion and contraction deformation of the bridge. It is a device that is designed to meet the needs of expansion and contraction of the beam and bridge deck caused by temperature changes, shrinkage creep of concrete and various loads, and can enable cars to pass smoothly across the bridge deck.

[0003] Seamless expansion devices are widely used in small-span bridge structures in my country. The common general structure is to set a cross-seam steel plate above the gap of the beam body, and then fill the expansion joint installation groove with elastic material to the road surface elevation, and adapt to the expansion and contraction of the main beam through the tensile and compressive deformation of the elastic material. However, under various loads, the existing cross-seam steel plate is prone to deflection in the middle part due to insufficient bending rigidity, which leads to cracking and damage of the seamless expansion joint, so further improvement is needed. Summary of the invention

[0004] In order to improve the structural strength of the cross-seam steel plate and thus reduce the possibility of downward deflection of the cross-seam steel plate, one of the purposes of the present application is to provide a seamless telescopic device.

[0005] The present application provides a seamless telescopic device that adopts the following technical solution: A seamless telescopic device comprises a displacement box, a cross-seam plate and a reinforcement member, wherein the displacement box is provided with two groups, and displacement slide grooves are horizontally opened along the opposite sides of the two displacement boxes, and the cross-seam plate abuts against the upper end surface of the displacement box. Connectors that are slidably connected to the displacement slide grooves are provided on both sides of the cross-seam plate so that the cross-seam plate can slide relative to the displacement box, and each group of reinforcement members comprises a reinforcement tube, a reinforcement rod, a diagonal support rod and an elastic member, the reinforcement tube is arranged on the displacement box or the beam body, the reinforcement tube is arranged vertically, the reinforcement rod is axially slidably inserted into the reinforcement tube, one end of the diagonal support rod is hinged to the lower end surface of the middle part of the cross-seam plate, and the other end of the diagonal support rod is hinged to the reinforcement rod, and the elastic member is arranged between the reinforcement tube and the reinforcement rod.

[0006] By adopting the above technical scheme, the cross-seam plate can slide horizontally relative to the displacement box by setting a connecting piece, and the two sides of the cross-seam plate are abutted against the upper end surface of the displacement box. The displacement box effectively supports the two sides of the cross-seam plate, and a reinforcement piece is added. When the width of the gap in the beam body is changed by factors such as ambient temperature, the two beam bodies together with the displacement box thereon slide toward or away from each other, so that the cross-seam plate and the reinforcement piece are relatively displaced, and the elastic piece forces the reinforcement rod to slide and adjust vertically, so as to facilitate the adaptive rotation of the diagonal support rod, and the elastic piece always keeps supporting the reinforcement rod, so that the vertical component force provided by the upper end of the diagonal support rod always keeps effectively supporting the middle position of the cross-seam plate, thereby improving the structural strength of the middle part of the cross-seam steel plate, thereby reducing the possibility of the cross-seam steel plate being deflected due to load in the middle and the two sides of the cross-seam plate being warped, thereby improving the service life of the cross-seam plate.

[0007] Preferably, the upper parts of the two diagonal support rods are inclined toward each other, and the elastic member is a spring built into the reinforcing tube, the lower end of the spring is fixedly connected to the bottom wall of the inner cavity of the reinforcing tube, and the upper end of the spring is fixedly connected to the lower end surface of the reinforcing rod, and the spring always remains in a compressed state.

[0008] By adopting the above technical scheme, when the two beam bodies together with the displacement boxes thereon slide toward each other, the displacement boxes and the reinforcement members slide relative to the span plate toward the direction close to the expansion joint, and the vertical component force provided by the lower end of the diagonal support rod presses the reinforcement rod downward relative to the reinforcement tube, thereby forcing the spring to be further compressed. At the same time, the reverse force generated by the spring is applied to the reinforcement rod, so that the diagonal support rod always maintains support for the middle position of the span plate. When the two beam bodies together with the displacement boxes thereon slide away from each other, the displacement boxes and the reinforcement members slide relative to the span plate toward the direction away from the expansion joint, and the spring applies a force to the reinforcement rod to force the reinforcement rod to move upward relative to the reinforcement tube, thereby making the diagonal support rod always maintain support for the middle position of the span plate.

[0009] Preferably, each group of the connecting parts includes a connecting vertical plate arranged on the lower end surface of the cross-seam plate and a connecting horizontal plate fixedly connected to the lower end surface of the connecting vertical plate, the connecting horizontal plate is fixedly connected to a displacement slide plate slidably connected to the displacement slide groove, the upper parts of the two diagonal support rods are inclined in a direction away from each other, the elastic part includes a first airbag body built into the displacement slide groove and a second airbag body built into the inner cavity of the reinforcement tube, the first airbag body is fixedly connected to the inner wall of the displacement slide groove, the first airbag body is fixedly connected to the displacement slide plate, and an air pipe is connected between the first airbag body and the second airbag body.

[0010] By adopting the above technical solution, when the two beams together with the displacement boxes thereon slide toward each other, the displacement boxes and the reinforcement members slide relative to the cross-seam plate toward the expansion joint, and the displacement slide plate slides relative to the displacement box toward the first airbag, thereby squeezing the first airbag. While the volume of the first airbag is reduced, the gas in the first airbag is collected into the second airbag through the air pipe, causing the second airbag to expand. At the same time, the cross-seam plate pulls the reinforcement rod upward relative to the reinforcement tube through the lower part of the diagonal support rod, thereby increasing the inner cavity of the reinforcement tube to provide expansion space for the second airbag, and the second airbag expands. After expansion, the reinforcing rod is kept supported, so that the diagonal support rod keeps supporting the middle part of the span plate; when the two beams together with the displacement box thereon slide away from each other, the displacement box and the reinforcement slide relative to the span plate in the direction away from the expansion joint, and the span plate squeezes the reinforcing rod through the lower part of the diagonal support rod, thereby forcing the reinforcing rod to move downward relative to the reinforcing tube, and the reinforcing rod squeezes the second airbag body, and the gas in the second airbag body enters the first airbag body through the air pipe, and at the same time, the displacement slide slides relative to the displacement box in the direction away from the first airbag body, and the second airbag body always keeps supporting the reinforcing rod.

[0011] Preferably, the displacement box is fixedly connected to a supporting bottom plate, the reinforcement tube is horizontally slidably connected to the supporting bottom plate, and the displacement box is provided with an adjustment component for adjusting the displacement position of the reinforcement tube.

[0012] By adopting the above technical solution, a supporting base plate is added to provide an installation carrier for the reinforcement tube, and the reinforcement tube is slidably connected to the supporting base plate. On the one hand, it is convenient for the staff to adjust the sliding position of the reinforcement tube through the adjustment component and adjust the preload force of the elastic part, so that the elastic part always keeps supporting the reinforcement rod. On the other hand, when the seamless telescopic device has been used for a period of time and the middle part of the cross-seam plate shows deflection, the staff adjusts the sliding position of the reinforcement tube through the adjustment component to increase the elastic deformation of the elastic part, thereby increasing the lifting force of the elastic part on the diagonal support rod of the reinforcement rod, so as to increase the supporting force of the diagonal support rod on the middle part of the cross-seam plate, so that the middle part of the cross-seam plate can be restored or the degree of deflection of the middle part of the cross-seam plate can be reduced, thereby further improving the service life of the cross-seam plate and increasing the maintenance cycle of the cross-seam plate.

[0013] Preferably, the lower part of the reinforcement tube is fixedly connected with a reinforcement slider slidably connected to the support base plate, and the adjustment assembly includes an adjustment screw rotatably connected to the support base plate and a driving component for driving the adjustment screw to rotate, and the adjustment screw is threaded through the reinforcement slider.

[0014] By adopting the above technical solution, the adjusting screw is driven to rotate by the driving component, and the reinforcing slider is restricted by the thread of the adjusting screw to slide along the axial direction of the adjusting screw.

[0015] Preferably, tooth grooves are provided on opposite sides of the two supporting base plates, and a plurality of tooth grooves are provided and are spaced apart along the length direction of the supporting base plates, and tooth bulges are formed between two adjacent tooth grooves. The tooth bulges on the two supporting base plates are staggered so that the tooth bulge on one of the supporting base plates can be slidably inserted into the tooth groove on the other supporting base plate, and the reinforcing slider is located on the tooth bulges.

[0016] By adopting the above technical solution, the support base plate is provided with a plurality of tooth grooves, so that a comb-tooth structure is formed on the opposite sides of the two support base plates, and the comb-tooth sides of the two support base plates slide and engage with each other, thereby extending the width dimension of the support base plate, increasing the sliding stroke of the reinforcement tube, and improving the installation adaptability of the reinforcement.

[0017] Preferably, the displacement box has an installation cavity located below the displacement slide groove, one end of the adjusting screw extends into the installation cavity, and the driving component includes a linkage rod rotatably connected to the inner wall of the installation cavity, a first linkage bevel gear fixedly mounted on the linkage rod, and a second linkage bevel gear built into the installation cavity and fixedly mounted on the end of the adjusting screw, and the first linkage bevel gear and the second linkage bevel gear are meshed.

[0018] By adopting the above technical solution, the linkage rod rotates to drive the first linkage bevel gear to rotate, and then the second linkage bevel gear drives the adjusting screw to rotate, thereby realizing the sliding position adjustment of the strengthening slider.

[0019] Preferably, a through hole located on one side of the displacement slide groove is vertically opened on the upper part of the displacement box, and the through hole is connected to the installation cavity. The driving component also includes an active rod rotatably inserted into the through hole, a first active bevel gear built into the installation cavity and fixedly sleeved on the active rod, and a second active bevel gear fixedly sleeved on the linkage rod. The upper part of the active rod protrudes from the upper end surface of the displacement box, the first active bevel gear and the second active bevel gear are meshed, and the displacement box is detachably connected to a protective cover covered on the upper end of the active rod.

[0020] By adopting the above technical solution, when the middle part of the cross-seam plate deflects downward, the protective cover is removed and the active rod is rotated. The active rod drives the linkage rod to rotate through the first active bevel gear and the second active bevel gear. The linkage rod drives the adjusting screw to rotate through the first linkage bevel gear and the second linkage bevel gear, thereby realizing the sliding position adjustment of the enhanced slider.

[0021] The bridge deck expansion joint structure provided in this application adopts the following technical solution: A bridge deck expansion joint structure comprises a pier cap beam and a pair of beam bodies supported on the pier cap beam, an expansion joint is provided between the end faces of the two beam bodies, a mounting groove is provided on the side of the two beam bodies close to each other, a seamless expansion device is installed in the mounting groove, a displacement box body is installed on the bottom inner wall of the mounting groove, a reinforcement pipe is installed on the displacement box body or the bottom inner wall of the mounting groove, an elastic surface layer is paved on the upper surface of the displacement box body, the elastic surface layer is located between the bridge deck of the beam body and the span plate, and the upper end surface of the elastic surface layer, the upper end surface of the span plate and the bridge deck of the beam body are flush.

[0022] The present application provides a paving method for a bridge deck expansion joint structure using the following technical solution: A paving method for a bridge deck expansion joint structure comprises the following steps: Step S01, reserving a mounting groove at the end of the beam body; Step S02, installing a seamless telescopic device in the installation groove; hoisting and placing the seamless telescopic device in the installation groove; Step S03, installing side templates on both sides of the displacement box; Step S04: pouring the elastic surface layer so that the elastic surface layer is flush with the upper end surface of the span plate and the bridge deck of the beam body.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. A reinforcement piece is added. When the width of the beam gap changes due to factors such as ambient temperature, the two beams together with the displacement boxes thereon slide toward or away from each other, so that the span plate and the reinforcement piece are relatively displaced. The elastic piece forces the reinforcement rod to slide and adjust vertically, so that the diagonal support rod can be adaptively rotated. The elastic piece always supports the reinforcement rod, so that the vertical component force provided by the upper end of the diagonal support rod always maintains effective support for the middle position of the span plate, thereby improving the structural strength of the middle part of the span plate, thereby reducing the possibility of the span plate being deflected due to the load in the middle and the warping of the two sides of the span plate, and improving the service life of the span plate; 2. The reinforcing tube is slidably connected to the supporting bottom plate. On the one hand, it is convenient for the staff to adjust the sliding position of the reinforcing tube through the adjusting component and adjust the preload force of the elastic part so that the elastic part always keeps supporting the reinforcing rod. On the other hand, when the seamless telescopic device has been used for a period of time and the middle part of the cross-seam plate shows deflection, the staff adjusts the sliding position of the reinforcing tube through the adjusting component to increase the elastic deformation of the elastic part, thereby increasing the lifting force of the elastic part on the diagonal support rod of the reinforcing rod, so as to increase the supporting force of the diagonal support rod on the middle part of the cross-seam plate, so that the middle part of the cross-seam plate can be restored or the degree of deflection of the middle part of the cross-seam plate can be reduced, thereby further improving the service life of the cross-seam plate and increasing the maintenance cycle of the cross-seam plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a structural schematic diagram of a bridge deck expansion joint structure in Example 1.

[0025] Figure 2 It is a structural schematic diagram of the seamless telescopic device in Example 1.

[0026] Figure 3 It is a schematic diagram of the structure of the driving component in Example 1.

[0027] Figure 4 It is a structural schematic diagram of the seamless telescopic device in Example 2.

[0028] Figure 5 It is a structural schematic diagram of the supporting base plate in Example 2.

[0029] Description of the accompanying drawings: 1. displacement box; 11. support bottom plate; 111. tooth groove; 112. tooth protrusion; 12. displacement slide; 13. reinforcement slide; 14. fixing plate; 15. installation cavity; 16. protective cover; 2. cross-seam plate; 3. reinforcement member; 31. reinforcement pipe; 32. reinforcement rod; 33. diagonal support rod; 34. elastic member; 341. first airbag body; 342. second airbag body; 35. reinforcement slider; 36. air pipe; 4. connecting Connecting parts; 41, connecting vertical plates; 42, connecting horizontal plates; 43, displacement slide plates; 5, adjusting components; 51, adjusting screw rods; 52, driving components; 521, linkage rods; 522, first linkage bevel gears; 523, second linkage bevel gears; 524, active rods; 525, first active bevel gears; 526, second active bevel gears; 10, pier cap beams; 20, beam bodies; 30, mounting grooves; 40, expansion joints; 50, elastic surface layers. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-5 This application is described in further detail.

[0031] Embodiment 1: A bridge deck expansion joint structure, referring to Figure 1 The bridge cap beam 10 comprises a bridge cap beam 10 and a pair of beam bodies 20 supported on the upper end surface of the bridge cap beam 10. The beam bodies 20 are supported on the upper end surface of the bridge cap beam 10 through bearings. An expansion joint 40 is provided between the end surfaces of the two beam bodies 20. The expansion joint 40 is located above the middle part of the bridge cap beam 10. The two beam bodies 20 are provided with a mounting groove 30 on one side close to each other. A seamless expansion device is installed in the mounting groove 30.

[0032] The seamless telescopic device comprises a displacement box 1 arranged in the installation slot 30, a cross-seam plate 2 located above the displacement box 1, and a reinforcement member 3 arranged in the displacement box 1 and located below the cross-seam plate 2. The cross-seam plate 2 is a steel plate, and the lower end surface of the cross-seam plate 2 abuts against the upper end surface of the displacement box 1. A displacement box 1 is correspondingly installed in each installation slot 30, and a support bottom plate 11 is protruding and fixed on the bottom of the opposite sides of the two displacement boxes 1, and the support bottom plate 11 is fixedly connected to the bottom inner wall of the installation slot 30 by bolts.

[0033] Reference Figure 2 , displacement chutes 12 are provided on opposite sides of the two displacement boxes 1 along their width direction, and connectors 4 slidably connected to the displacement chutes 12 are provided on both sides of the cross-seam plate 2 so that the cross-seam plate 2 can slide relative to the displacement box 1. Specifically, the connector 4 includes a connecting vertical plate 41 fixedly connected to the lower end surface of the cross-seam plate 2 and a connecting horizontal plate 42 fixedly connected to the lower end surface of the connecting vertical plate 41, and a displacement slide plate 43 is fixedly connected to the end of the connecting horizontal plate 42 away from the connecting vertical plate 41, and the displacement slide plate 43 is slidably connected to the displacement chutes 12.

[0034] There are multiple groups of reinforcement members 3 and they are spaced apart along the length direction of the support base plate 11. Each group of reinforcement members 3 includes a reinforcement tube 31 arranged on the upper end surface of the support base plate 11, a reinforcement rod 32 inserted in the reinforcement tube 31 along the axial sliding movement, a diagonal support rod 33 hinged at one end to the lower end surface of the middle position of the spanning plate 2 and hinged at the upper part of the reinforcement rod 32 at the other end, and an elastic member 34 arranged between the reinforcement tube 31 and the reinforcement rod 32. The reinforcement tube 31 is located below the middle part of the spanning plate 2, and the axis of the reinforcement tube 31 is arranged vertically. In this embodiment, the upper parts of the two rows of diagonal support rods 33 on the spanning plate 2 are inclined toward each other. The elastic member 34 is a spring built into the reinforcement tube 31, the lower end of the spring is fixedly connected to the bottom wall of the inner cavity of the reinforcement tube 31, and the upper end of the spring is fixedly connected to the lower end surface of the reinforcement rod 32, and the spring is always kept in a compressed state.

[0035] Reference Figure 2 , Figure 3The reinforcing tube 31 is slidably connected to the supporting bottom plate 11 along the width direction of the supporting bottom plate 11. Specifically, the upper end surface of the supporting bottom plate 11 is provided with a reinforcing chute 13 along its own width direction, and the lower end surface of the reinforcing tube 31 is protruding and fixedly connected with a reinforcing slider 35 slidably connected to the reinforcing chute 13. The displacement box 1 has an installation cavity 15 located below the displacement chute 12, and a fixing plate 14 is fixedly connected to the upper end surface of the supporting bottom plate 11 on one side close to the expansion joint 40. The displacement box 1 is provided with an adjustment component 5 for adjusting the displacement position of the reinforcing tube 31. The adjustment component 5 includes an adjustment screw 51 rotatably connected to the fixing plate 14 and a driving component 52 for driving the adjustment screw 51 to rotate. The axial direction of the adjustment screw 51 is parallel to the length direction of the reinforcing chute 13, and one end of the adjustment screw 51 extends into the installation cavity 15. The adjustment screw 51 is threadedly penetrated through the reinforcing slider 35.

[0036] The upper end surface of the displacement box 1 is vertically provided with a through hole located on one side of the displacement slide groove 12, and the through hole is connected to the installation cavity 15. The driving component 52 includes a linkage rod 521 rotatably connected to the inner wall of the installation cavity 15, a first linkage bevel gear 522 coaxially fixedly sleeved on the linkage rod 521, a second linkage bevel gear 523 built into the installation cavity 15 and coaxially fixedly sleeved on the end of the adjusting screw 51, an active rod 524 rotatably penetrated through the through hole, a first active bevel gear 525 built into the installation cavity 15 and coaxially fixedly sleeved on the active rod 524, and a second active bevel gear 526 coaxially fixedly sleeved on the linkage rod 521. The axial direction of the linkage rod 521 is parallel to the length direction of the displacement box 1, and the first linkage bevel gear 522 and the second linkage bevel gear 523 are meshed. The axial direction of the active rod 524 is vertically arranged, and the upper part of the active rod 524 protrudes from the upper end surface of the displacement box 1, and the first active bevel gear 525 and the second active bevel gear 526 are meshed.

[0037] Reference Figure 2 The upper surface of the displacement box 1 is paved with an elastic surface layer 50, which is located between the bridge deck of the beam body 20 and the side of the span plate 2. The upper end surface of the elastic surface layer 50, the upper end surface of the span plate 2 and the bridge deck of the beam body 20 are flush. In this embodiment, the elastic surface layer 50 is a material obtained by adding SBS, light oil, anti-rutting agent and rubber powder modified material to asphalt-based materials and mixing with 510mm aggregate. The elastic surface layer 50 is detachably connected with a protective cover 16 that is covered on the upper end of the active rod 524.

[0038] The implementation principle of Example 1 is: when the two beam bodies 20 together with the displacement box bodies 1 thereon slide toward each other, the displacement box bodies 1 and the reinforcement member 3 slide relative to the cross-seam plate 2 toward the direction close to the expansion joint 40, and the vertical component force provided by the lower end of the diagonal support rod 33 presses the reinforcement rod 32 to move downward relative to the reinforcement tube 31, thereby forcing the spring to be further compressed. At the same time, the reverse force generated by the spring is applied to the reinforcement rod 32, so that the diagonal support rod 33 always maintains support for the middle position of the cross-seam plate 2. When the two beam bodies 20 together with the displacement box bodies 1 thereon slide away from each other, the displacement box bodies 1 and the reinforcement member 3 slide relative to the cross-seam plate 2 toward the direction away from the expansion joint 40, and the spring applies a force to the reinforcement rod 32 to force the reinforcement rod 32 to move upward relative to the reinforcement tube 31, so that the diagonal support rod 33 always maintains support for the middle position of the cross-seam plate 2.

[0039] This embodiment also discloses a method for paving a bridge deck expansion joint structure, comprising the following steps: Step S01, reserving a mounting groove 30 at the end of the beam body 20; Step S02, install the seamless telescopic device in the installation groove 30; hoist the seamless telescopic device as a whole into the installation groove 30 by hoisting equipment, and lock the supporting base plate 11 by bolts. During this process, the staff can rotate the active rod 524, and drive the linkage rod 521 to rotate through the first active bevel gear 525 and the second active bevel gear 526. The linkage rod 521 drives multiple adjusting screws 51 to rotate synchronously through the first linkage bevel gear 522 and the second linkage bevel gear 523, thereby realizing the sliding position adjustment of multiple reinforcing sliders 35, adjusting the sliding position of the reinforcing tube 31, and adjusting the preload force of the spring, so that the spring always keeps supporting the reinforcing rod 32.

[0040] Step S03, installing side templates on both sides of the displacement box 1; Step S04, pouring the elastic surface layer 50 so that the elastic surface layer 50 is flush with the upper end surface of the span plate 2 and the bridge deck of the beam body 20; Step S05 , installing the protective cover 16 , wherein the upper end surface of the protective cover 16 is flush with the upper end surface of the elastic surface layer 50 .

[0041] When the seamless telescopic device has been used for a period of time and the middle part of the cross-seam plate 2 shows deflection, in the present embodiment, the staff removes the protective cover 16, rotates the active rod 524, drives the linkage rod 521 to rotate through the first active bevel gear 525 and the second active bevel gear 526, and the linkage rod 521 drives the multiple adjusting screws 51 to rotate synchronously through the first linkage bevel gear 522 and the second linkage bevel gear 523, so that the multiple reinforcing sliders 35 can slide toward the expansion joint 40, and the reinforcing rod 32 is applied with a reaction force by the spring to increase the supporting force of the diagonal support rod 33 on the middle part of the cross-seam plate 2, so that the middle part of the cross-seam plate 2 is restored or the deflection degree of the middle part of the cross-seam plate 2 is reduced, thereby further improving the service life of the cross-seam plate 2 and increasing the maintenance cycle of the cross-seam plate 2.

[0042] Embodiment 2: The difference between this embodiment and embodiment 1 is that, referring to Figure 4 , Figure 5 , tooth grooves 111 are provided on opposite sides of the support bottom plates 11 of the two displacement boxes 1. A plurality of tooth grooves 111 are provided and are spaced apart along the length direction of the support bottom plates 11. Tooth protrusions 112 are formed between two adjacent tooth grooves 111. The tooth protrusions 112 on the two support bottom plates 11 are staggered, so that the tooth protrusions 112 on one support bottom plate 11 are slidably inserted into the tooth grooves 111 on the other support bottom plate 11, and the tooth protrusions 112 cross the expansion joint 40. The reinforcement chute 13 is provided on the tooth protrusions 112, so that the reinforcement members 3 on the two support bottom plates 11 are staggered, and the diagonal braces 33 respectively located on both sides of the expansion joint 40 are cross-arranged, so that the upper parts of the corresponding two diagonal braces 33 are inclined in a direction away from each other.

[0043] The elastic member 34 includes a first airbag body 341 built into the displacement groove 12 and a second airbag body 342 built into the inner cavity of the reinforcement tube 31. The first airbag body 341 is fixedly connected to the inner wall of the displacement groove 12. The first airbag body 341 is fixedly connected to the displacement slide plate 43. An air pipe 36 is connected between the first airbag body 341 and the second airbag body 342. The air pipe 36 is a hose.

[0044] The implementation principle of Example 2 is as follows: when the two beam bodies 20 together with the displacement box bodies 1 thereon slide toward each other, the displacement box bodies 1 and the reinforcement member 3 slide relative to the cross-seam plate 2 toward the expansion joint 40, and the displacement slide plate 43 slides relative to the displacement box body 1 toward the first airbag body 341, thereby squeezing the first airbag body 341. While the volume of the first airbag body 341 is reduced, the gas in the first airbag body 341 is collected into the second airbag body 342 through the air pipe 36, so that the second airbag body 342 expands. At the same time, the cross-seam plate 2 pulls the reinforcement rod 32 upward relative to the reinforcement tube 31 through the lower part of the diagonal support rod 33, thereby increasing the inner cavity of the reinforcement tube 31 to provide expansion space for the second airbag body 342. After the second airbag body 342 expands, it maintains support for the reinforcement rod 32, so that the diagonal support rod 33 maintains support for the second airbag body 342. The middle part of the span plate 2 is supported; when the two beam bodies 20 together with the displacement box body 1 thereon slide away from each other, the displacement box body 1 and the reinforcement member 3 slide relative to the span plate 2 in the direction away from the expansion joint 40, and the span plate 2 squeezes the reinforcement rod 32 through the lower part of the diagonal support rod 33, thereby forcing the reinforcement rod 32 to move downward relative to the reinforcement tube 31, and the reinforcement rod 32 squeezes the second airbag body 342, and the gas in the second airbag body 342 enters the first airbag body 341 through the air pipe 36. At the same time, the displacement slide plate 43 slides relative to the displacement box body 1 in the direction away from the first airbag body 341, and the second airbag body 342 always keeps supporting the reinforcement rod 32, thereby improving the structural strength of the middle part of the span steel plate, thereby reducing the possibility of the span steel plate being deflected due to the load in the middle and the warping on both sides of the span plate 2, thereby improving the service life of the span plate 2.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A seamless telescopic device, characterized in that: The invention comprises a displacement box (1), a cross-seam plate (2) and a reinforcement member (3), wherein the displacement box (1) is provided with two groups, and displacement slide grooves (12) are horizontally opened on opposite sides of the two displacement boxes (1), the cross-seam plate (2) abuts against the upper end surface of the displacement box (1), and both sides of the cross-seam plate (2) are provided with connecting members (4) slidably connected to the displacement slide grooves (12) so that the cross-seam plate (2) can slide relative to the displacement box (1), and each group of reinforcement members (3) comprises a reinforcement tube (3) 1), a reinforcing rod (32), a diagonal bracing rod (33) and an elastic member (34), wherein the reinforcing tube (31) is arranged on the displacement box (1) or the beam body (20), the reinforcing tube (31) is arranged vertically, the reinforcing rod (32) is inserted into the reinforcing tube (31) in an axially sliding manner, one end of the diagonal bracing rod (33) is hinged to the lower end surface of the middle part of the span plate (2), and the other end of the diagonal bracing rod (33) is hinged to the reinforcing rod (32), and the elastic member (34) is arranged between the reinforcing tube (31) and the reinforcing rod (32).

2. A seamless telescopic device according to claim 1, characterized in that: The upper parts of the two diagonal support rods (33) are inclined in a direction toward each other, and the elastic member (34) is a spring built into the reinforcing tube (31), the lower end of the spring is fixedly connected to the bottom wall of the inner cavity of the reinforcing tube (31), and the upper end of the spring is fixedly connected to the lower end surface of the reinforcing rod (32), and the spring always remains in a compressed state.

3. A seamless telescopic device according to claim 1, characterized in that: Each group of the connecting members (4) comprises a connecting vertical plate (41) arranged on the lower end surface of the cross-seam plate (2) and a connecting horizontal plate (42) fixedly connected to the lower end surface of the connecting vertical plate (41); the connecting horizontal plate (42) is fixedly connected to a displacement slide plate (43) slidably connected to the displacement slide groove (12); the upper parts of the two diagonal support rods (33) are inclined in a direction away from each other; the elastic member (34) comprises a first airbag body (341) built into the displacement slide groove (12) and a second airbag body (342) built into the inner cavity of the reinforcing tube (31); the first airbag body (341) is fixedly connected to the inner wall of the displacement slide groove (12); the first airbag body (341) is fixedly connected to the displacement slide plate (43); and an air pipe (36) is connected between the first airbag body (341) and the second airbag body (342).

4. A seamless telescopic device according to claim 1, characterized in that: The displacement box (1) is fixedly connected to a support base plate (11), the reinforcement tube (31) is horizontally slidably connected to the support base plate (11), and the displacement box (1) is provided with an adjustment component (5) for adjusting the displacement position of the reinforcement tube (31).

5. A seamless telescopic device according to claim 4, characterized in that: A reinforcing slider (35) slidably connected to the supporting base plate (11) is fixedly connected to the lower portion of the reinforcing tube (31); the adjusting assembly (5) comprises an adjusting screw (51) rotatably connected to the supporting base plate (11) and a driving component (52) for driving the adjusting screw (51) to rotate; the adjusting screw (51) is threadedly inserted into the reinforcing slider (35).

6. A seamless telescopic device according to claim 5, characterized in that: Tooth grooves (111) are provided on opposite sides of the two support base plates (11), a plurality of tooth grooves (111) are provided and are spaced apart along the length direction of the support base plate (11), a tooth protrusion (112) is formed between two adjacent tooth grooves (111), and the tooth protrusions (112) on the two support base plates (11) are staggered so that the tooth protrusion (112) on one support base plate (11) is slidably inserted into the tooth groove (111) on the other support base plate (11), and the reinforcing slider (35) is located on the tooth protrusion (112).

7. A seamless telescopic device according to claim 5, characterized in that: The displacement box (1) has a mounting cavity (15) located below the displacement slide groove (12); one end of the adjusting screw rod (51) extends into the mounting cavity (15); the driving component (52) comprises a linkage rod (521) rotatably connected to the inner wall of the mounting cavity (15); a first linkage bevel gear (522) fixedly sleeved on the linkage rod (521); and a second linkage bevel gear (523) built into the mounting cavity (15) and fixedly sleeved on the end of the adjusting screw rod (51); the first linkage bevel gear (522) and the second linkage bevel gear (523) are meshed.

8. A seamless telescopic device according to claim 7, characterized in that: The upper portion of the displacement box (1) is provided with a through hole located on one side of the displacement slide groove (12) in the vertical direction, and the through hole is connected to the installation cavity (15). The driving component (52) further comprises an active rod (524) rotatably inserted into the through hole, a first active bevel gear (525) built into the installation cavity (15) and fixedly sleeved on the active rod (524), and a second active bevel gear (526) fixedly sleeved on the linkage rod (521). The upper portion of the active rod (524) protrudes from the upper end surface of the displacement box (1), the first active bevel gear (525) and the second active bevel gear (526) are meshed, and the displacement box (1) is detachably connected to a protective cover (16) which is arranged on the upper end of the active rod (524).

9. A bridge deck expansion joint structure, characterized in that: The invention comprises a bridge pier cap beam (10) and a pair of beam bodies (20) supported on the bridge pier cap beam (10), an expansion joint (40) being provided between the end faces of the two beam bodies (20), a mounting groove (30) being provided on the side where the two beam bodies (20) are close to each other, a seamless expansion device as claimed in any one of claims 1 to 8 being installed in the mounting groove (30), a displacement box (1) being installed on the bottom inner wall of the mounting groove (30), a reinforcement pipe (31) being installed on the displacement box (1) or the bottom inner wall of the mounting groove (30), an elastic surface layer (50) being provided on the upper surface of the displacement box (1), the elastic surface layer (50) being located between the bridge deck of the beam body (20) and the span plate (2), and the upper end surface of the elastic surface layer (50), the upper end surface of the span plate (2) and the bridge deck of the beam body (20) being flush.

10. A method for paving a bridge deck expansion joint structure according to claim 9, characterized in that: The following steps are involved: Step S01, reserving a mounting groove (30) at the end of the beam body (20); Step S02, installing a seamless telescopic device in the installation groove (30); hoisting and placing the seamless telescopic device in the installation groove (30); Step S03, installing side formwork on both sides of the displacement box (1); Step S04: pouring the elastic surface layer (50) so that the elastic surface layer (50) is flush with the upper end surface of the span plate (2) and the bridge deck of the beam body (20).

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