Seamless expansion device, bridge expansion joint structure and paving method thereof

Abstract

The application relates to the technical field of bridge expansion devices, in particular to a seamless expansion device, a bridge deck expansion joint structure and a paving method thereof, the seamless expansion device comprising displacement box bodies, a cross-joint plate and reinforcing members, the displacement box bodies are provided in two groups, displacement sliding grooves are horizontally arranged on the opposite sides of the two displacement box bodies, the cross-joint plate abuts against the upper end faces of the displacement box bodies, the two sides of the cross-joint plate are provided with connecting members which are slidably connected to the displacement sliding grooves, so that the cross-joint plate can slide relative to the displacement box bodies, each group of the reinforcing members comprises a reinforcing pipe, a reinforcing rod, an inclined strut and an elastic member, the reinforcing pipe is arranged in the displacement box body or a beam body, the reinforcing pipe is arranged in a vertical mode, the reinforcing rod is axially and slidably arranged in the reinforcing pipe, one end of the inclined strut is hingedly connected to the lower middle end face of the cross-joint plate, the other end of the inclined strut is hingedly connected to the reinforcing rod, and the elastic member is arranged between the reinforcing pipe and the reinforcing rod. The application has the effect of improving the structural strength of the cross-joint steel plate.

Description

Technical Field

[0001] This application relates to the field of bridge expansion joint technology, and in particular to a seamless expansion joint, a bridge deck expansion joint structure, and a paving method thereof. Background Technology

[0002] Bridge expansion joints are mechanisms installed between the two beam end faces and between the beam end faces and the abutments to accommodate the expansion and contraction deformation of the bridge. They are designed to meet the needs of the beam and bridge deck expansion and contraction deformation caused by temperature changes, concrete shrinkage and creep, and various loads, and to allow vehicles to drive smoothly across the bridge.

[0003] Seamless expansion joints are widely used in short-span bridge structures in my country. Their common construction involves installing a steel plate across the gap in the beam, then filling the expansion joint installation groove with elastic material up to the road surface level. The expansion and contraction of the main beam is accommodated by the tensile and compressive deformation of the elastic material. However, under various loads, the existing steel plate across the gap is prone to deflection in the middle due to insufficient bending stiffness, leading to cracking and damage in the seamless expansion joint. Therefore, further improvements are needed. Summary of the Invention

[0004] In order to improve the structural strength of the joint steel plate and thus reduce the possibility of deflection of the joint steel plate, one of the purposes of this application is to provide a seamless expansion joint device.

[0005] The seamless telescopic device provided in this application adopts the following technical solution:

[0006] A seamless telescopic device includes a displacement box, a cross joint plate, and reinforcing members. Two sets of displacement boxes are provided, with horizontally spaced displacement grooves along their opposite sides. The cross joint plate abuts against the upper surface of the displacement box. Connectors that slide along the displacement grooves are provided on both sides of the cross joint plate, allowing it to slide relative to the displacement box. Each set of reinforcing members includes a reinforcing tube, a reinforcing rod, a diagonal brace, and an elastic member. The reinforcing tube is installed vertically within the displacement box or beam. The reinforcing rod slides axially into the reinforcing tube. One end of the diagonal brace is hinged to the lower surface of the cross joint plate, and the other end is hinged to the reinforcing rod. The elastic member is located between the reinforcing tube and the reinforcing rod.

[0007] By adopting the above technical solution, the joint plate can slide horizontally relative to the displacement box by setting connecting parts. The two sides of the joint plate abut against the upper surface of the displacement box, and the displacement box effectively supports the two sides of the joint plate. In addition, a reinforcing member is added. When the width of the beam gap changes due to factors such as ambient temperature, the two beams and the displacement box on them slide towards or away from each other, thereby causing relative displacement between the joint plate and the reinforcing member. The elastic member forces the reinforcing rod to slide and adjust vertically, which facilitates the adaptive rotation of the diagonal brace. The elastic member always supports the reinforcing rod, so that the vertical component provided by the upper end of the diagonal brace always effectively supports the middle position of the joint plate, improves the structural strength of the middle of the joint plate, and reduces the possibility of the joint plate deflecting due to the load in the middle and the sides of the joint plate warping, thereby improving the service life of the joint plate.

[0008] Preferably, the upper parts of the two diagonal braces are inclined toward each other, and the elastic element 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 face of the reinforcing rod. The spring is always kept in a compressed state.

[0009] By adopting the above technical solution, when the two beams and their displacement boxes slide towards each other, the displacement boxes and reinforcing members slide towards the expansion joint relative to the cross joint plate. The vertical component force provided by the lower end of the diagonal brace compresses the reinforcing rod relative to the reinforcing tube, thereby forcing the spring to be further compressed. At the same time, the reverse force generated by the spring is applied to the reinforcing rod, so that the diagonal brace always supports the middle position of the cross joint plate. When the two beams and their displacement boxes slide away from each other, the displacement boxes and reinforcing members slide away from the expansion joint relative to the cross joint plate. The spring applies a force to the reinforcing rod, forcing the reinforcing rod to move upward relative to the reinforcing tube, so that the diagonal brace always supports the middle position of the cross joint plate.

[0010] Preferably, each set of connectors includes a connecting vertical plate disposed on the lower end face of the cross joint plate and a connecting horizontal plate fixedly connected to the lower end face of the connecting vertical plate. The connecting horizontal plate is fixedly connected to a displacement sliding plate that is slidably connected to the displacement groove. The upper parts of the two diagonal braces are inclined in a direction away from each other. The elastic element includes a first airbag body built into the displacement groove and a second airbag body built into the inner cavity of the reinforcing tube. The first airbag body is fixedly connected to the inner wall of the displacement groove and the displacement sliding plate. An air tube communicates between the first airbag body and the second airbag body.

[0011] By adopting the above technical solution, when the two beams and their displacement boxes slide towards each other, the displacement boxes and reinforcing members slide relative to the joint plate towards the expansion joint, and the displacement sliding plate slides relative to the displacement boxes towards the first airbag, thereby compressing the first airbag. As the volume of the first airbag decreases, the gas inside the first airbag flows through the air pipe into the second airbag, causing the second airbag to expand. Simultaneously, the joint plate pulls the reinforcing rod upward relative to the reinforcing tube through the lower part of the diagonal brace, thereby increasing the inner cavity of the reinforcing tube to provide expansion space for the second airbag. After expansion, the reinforcing rod is supported, thus ensuring that the diagonal brace supports the middle of the expansion joint plate. When the two beams and their displacement boxes slide in opposite directions, the displacement boxes and reinforcing members slide away from the expansion joint plate relative to the expansion joint. The expansion joint plate compresses the reinforcing rod through the lower part of the diagonal brace, forcing the reinforcing rod to move downward relative to the reinforcing tube. The reinforcing rod compresses the second airbag, and the gas in the second airbag enters the first airbag through the air tube. At the same time, the displacement sliding plate slides away from the first airbag relative to the displacement box, and the second airbag always supports the reinforcing rod.

[0012] Preferably, the displacement box is fixedly connected to a supporting base plate, the reinforcing tube is horizontally slidably connected to the supporting base plate, and the displacement box is provided with an adjustment component for adjusting the displacement position of the reinforcing tube.

[0013] By adopting the above technical solution, a supporting base plate is added to provide an installation carrier for the reinforcing tube. The reinforcing tube is slidably connected to the supporting base plate. On the one hand, it is convenient for workers to adjust the sliding position of the reinforcing tube and the preload of the elastic element by adjusting the adjustment components, so that the elastic element always supports the reinforcing rod. On the other hand, when the seamless telescopic device has been used for a period of time and the middle of the cross joint plate shows a downward deflection, workers can adjust the sliding position of the reinforcing tube by adjusting the adjustment components, increasing the elastic deformation of the elastic element, thereby increasing the lifting force of the elastic element on the reinforcing rod diagonal brace, so as to increase the supporting force of the diagonal brace on the middle of the cross joint plate, so that the middle of the cross joint plate can be restored or the degree of downward deflection in the middle of the cross joint plate can be reduced, further improving the service life of the cross joint plate and increasing the maintenance cycle of the cross joint plate.

[0014] Preferably, the lower part of the reinforcing tube is fixedly connected to a reinforcing slider that is slidably connected to the supporting base plate, and the adjusting assembly includes an adjusting screw that is rotatably connected to the supporting base plate and a driving component that drives the adjusting screw to rotate, with the adjusting screw threaded through the reinforcing slider.

[0015] By adopting the above technical solution, the adjusting screw is driven to rotate by the driving component, which strengthens the thread restriction effect of the adjusting screw on the slider and allows it to slide along the axial direction of the adjusting screw.

[0016] Preferably, the two supporting base plates have toothed grooves on opposite sides, and the toothed grooves are arranged in multiple ways and distributed at intervals along the length direction of the supporting base plates. A toothed protrusion is formed between two adjacent toothed grooves, and the toothed protrusions on the two supporting base plates are staggered, so that the toothed protrusion on one supporting base plate slides into the toothed groove on the other supporting base plate, and the reinforcing slider is located on the toothed protrusion.

[0017] By adopting the above technical solution, the support base plate is provided with several toothed grooves, so that the two support base plates form a comb-like structure on opposite sides. The comb-like sides of the two support base plates slide and engage with each other, extending the width of the support base plate, increasing the sliding stroke of the reinforcing tube, and improving the installation adaptability of the reinforcing component.

[0018] 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 sleeved on the linkage rod, and a second linkage bevel gear built into the installation cavity and fixedly sleeved on the end of the adjusting screw, wherein the first linkage bevel gear and the second linkage bevel gear mesh.

[0019] By adopting the above technical solution, the rotation of the linkage rod drives the first linkage bevel gear to rotate, which in turn drives the adjusting screw to rotate through the second linkage bevel gear, thereby realizing the adjustment of the sliding position of the enhanced slider.

[0020] Preferably, the upper part of the displacement box has a through hole on one side of the displacement groove, which is connected to the mounting cavity. The driving component also includes an active rod that rotates through the through hole, a first active bevel gear that is built into the mounting cavity and fixedly sleeved on the active rod, and a second active bevel gear that is fixedly sleeved on the linkage rod. The upper part of the active rod protrudes from the upper end face of the displacement box. The first active bevel gear and the second active bevel gear mesh. The displacement box is detachably connected to a protective cover that covers the upper end of the active rod.

[0021] By adopting the above technical solution, when the middle of the cross-slit plate deflects downward, the protective cover is removed, the active rod is rotated, and 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 adjustment of the sliding position of the reinforcing slider.

[0022] The bridge deck expansion joint structure provided in this application adopts the following technical solution:

[0023] A bridge deck expansion joint structure includes a pier cap beam and a pair of beams supported on the pier cap beam. An expansion joint is provided between the end faces of the two beams. An installation groove is provided on the side of the two beams that are close to each other. A seamless expansion device is installed in the installation groove. A displacement box is installed on the bottom inner wall of the installation groove. A reinforcing pipe is installed on the displacement box or the bottom inner wall of the installation groove. An elastic surface layer is laid on the upper surface of the displacement box. The elastic surface layer is located between the bridge deck of the beam and the cross joint plate. The upper end face of the elastic surface layer, the upper end face of the cross joint plate, and the bridge deck of the beam are flush.

[0024] The paving method for a bridge deck expansion joint structure provided in this application adopts the following technical solution:

[0025] A method for paving a bridge deck expansion joint structure includes the following steps:

[0026] Step S01: Reserve an installation groove at the end of the beam;

[0027] Step S02: Install the seamless expansion joint in the mounting slot; hoist the seamless expansion joint into the mounting slot.

[0028] Step S03: Install side templates on both sides of the displacement box;

[0029] Step S04: Pour the elastic surface layer so that it is flush with the upper surface of the cross joint slab and the bridge deck of the beam.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. A reinforcing member is added. When the width of the beam gap changes due to factors such as ambient temperature, the two beams, together with the displacement box on them, slide towards or away from each other. This causes relative displacement between the joint plate and the reinforcing member. The elastic member forces the reinforcing rod to slide and adjust vertically, which facilitates the adaptive rotation of the diagonal brace. The elastic member always supports the reinforcing rod, so that the vertical component provided by the upper end of the diagonal brace always effectively supports the middle position of the joint plate, improves the structural strength of the middle of the joint plate, and reduces the possibility of the joint plate deflecting due to the load in the middle and the warping of the sides of the joint plate, thus improving the service life of the joint plate.

[0032] 2. The reinforcing tube is slidably connected to the support base plate. On the one hand, this allows workers to adjust the sliding position of the reinforcing tube and the preload of the elastic element by adjusting the components, ensuring that the elastic element always supports the reinforcing rod. On the other hand, when the seamless telescopic device has been used for a period of time and the middle of the cross joint plate shows signs of sagging, workers can adjust the sliding position of the reinforcing tube by adjusting the components, increasing the elastic deformation of the elastic element. This increases the lifting force of the elastic element on the reinforcing rod and the diagonal brace, thereby increasing the support force of the diagonal brace on the middle of the cross joint plate. This allows the middle of the cross joint plate to recover or reduces the degree of sagging, further improving the service life of the cross joint plate and increasing the maintenance cycle. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a bridge deck expansion joint structure in Example 1.

[0034] Figure 2 This is a schematic diagram of the seamless telescopic device in Example 1.

[0035] Figure 3 This is a schematic diagram of the drive component in Embodiment 1.

[0036] Figure 4 This is a schematic diagram of the seamless telescopic device in Example 2.

[0037] Figure 5 This is a schematic diagram of the supporting base plate in Example 2.

[0038] Explanation of reference numerals in the attached drawings: 1. Displacement box; 11. Support base plate; 111. Tooth groove; 112. Tooth protrusion; 12. Displacement slide groove; 13. Reinforcing slide groove; 14. Fixing plate; 15. Mounting cavity; 16. Protective cover; 2. Cross-slot plate; 3. Reinforcing member; 31. Reinforcing tube; 32. Reinforcing rod; 33. Diagonal brace; 34. Elastic member; 341. First airbag body; 342. Second airbag body; 35. Reinforcing slider; 36. Air pipe; 4. Connecting... 41. Connecting vertical plate; 42. Connecting horizontal plate; 43. Displacement sliding plate; 5. Adjustment assembly; 51. Adjusting screw; 52. Drive component; 521. Linkage rod; 522. First linkage bevel gear; 523. Second linkage bevel gear; 524. Drive rod; 525. First drive bevel gear; 526. Second drive bevel gear; 10. Pier cap beam; 20. Beam body; 30. Mounting groove; 40. Expansion joint; 50. Elastic surface layer. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0040] Example 1:

[0041] A bridge deck expansion joint structure, referring to Figure 1 The bridge includes a pier cap beam 10 and a pair of beams 20 supported on the upper surface of the pier cap beam 10. The beams 20 are supported on the upper surface of the pier cap beam 10 by supports. An expansion joint 40 is provided between the end faces of the two beams 20, and the expansion joint 40 is located above the middle of the pier cap beam 10. The side of the two beams 20 that is close to each other has a mounting groove 30, and a seamless expansion device is installed in the mounting groove 30.

[0042] The seamless telescopic device includes a displacement box 1 disposed in the mounting groove 30, a cross joint plate 2 located above the displacement box 1, and a reinforcing member 3 disposed in the displacement box 1 and located below the cross joint plate 2. The cross joint plate 2 is made of steel plate, and its lower end face abuts against the upper end face of the displacement box 1. One displacement box 1 is installed in each mounting groove 30. Support base plates 11 are fixedly protruding from the bottom of the opposite sides of the two displacement boxes 1. The support base plates 11 are fixedly connected to the bottom inner wall of the mounting groove 30 by bolts.

[0043] Reference Figure 2 The two displacement boxes 1 have displacement grooves 12 on their opposite sides along their width direction. Both sides of the cross joint plate 2 are provided with connectors 4 that slide relative to the displacement grooves 12, allowing the cross joint plate 2 to slide relative to the displacement box 1. Specifically, the connectors 4 include a connecting vertical plate 41 fixedly connected to the lower end face of the cross joint plate 2 and a connecting horizontal plate 42 fixedly connected to the lower end face of the connecting vertical plate 41. 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 slides in connection with the displacement groove 12.

[0044] Multiple sets of reinforcing members 3 are provided and spaced apart along the length of the supporting base plate 11. Each set of reinforcing members 3 includes a reinforcing tube 31 disposed on the upper end face of the supporting base plate 11, a reinforcing rod 32 slidably inserted into the reinforcing tube 31 along the axial direction, a diagonal brace 33 with one end hinged to the lower end face of the middle position of the cross joint plate 2 and the other end hinged to the upper part of the reinforcing rod 32, and an elastic member 34 disposed between the reinforcing tube 31 and the reinforcing rod 32. The reinforcing tube 31 is located below the middle part of the cross joint plate 2, and the axis of the reinforcing tube 31 is vertically arranged. In this embodiment, the upper parts of the two rows of diagonal braces 33 on the cross joint plate 2 are inclined towards each other. 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 face of the reinforcing rod 32. The spring is always kept in a compressed state.

[0045] Reference Figure 2 , Figure 3The reinforcing tube 31 is slidably connected to the supporting base plate 11 along the width direction. Specifically, the upper end face of the supporting base plate 11 is provided with a reinforcing groove 13 along its own width direction, and the lower end face of the reinforcing tube 31 is protruding and fixedly connected to a reinforcing slider 35 that is slidably connected to the reinforcing groove 13. The displacement box 1 has an installation cavity 15 located below the displacement groove 12. A fixing plate 14 is fixedly connected to the upper end face of the supporting base plate 11 near the expansion joint 40. The displacement box 1 is provided with an adjustment assembly 5 for adjusting the displacement position of the reinforcing tube 31. The adjustment assembly 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 groove 13. One end of the adjustment screw 51 extends into the installation cavity 15, and the adjustment screw 51 is threaded through the reinforcing slider 35.

[0046] The upper end face of the displacement housing 1 has a through hole along the vertical direction located on one side of the displacement groove 12, which connects to the mounting cavity 15. The driving component 52 includes a linkage rod 521 rotatably connected to the inner wall of the mounting 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 mounting cavity 15 and coaxially fixedly sleeved on the end of the adjusting screw 51, a driving rod 524 rotatably passing through the through hole, a first driving bevel gear 525 built into the mounting cavity 15 and coaxially fixedly sleeved on the driving rod 524, and a second driving 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 housing 1, and the first linkage bevel gear 522 and the second linkage bevel gear 523 mesh. The axial direction of the driving rod 524 is vertically arranged, and the upper part of the driving rod 524 protrudes from the upper end face of the displacement housing 1, and the first driving bevel gear 525 and the second driving bevel gear 526 mesh.

[0047] Reference Figure 2 An elastic surface layer 50 is laid on the upper surface of the displacement box 1. The elastic surface layer 50 is located between the bridge deck of the beam 20 and the side of the cross joint plate 2. The upper end surface of the elastic surface layer 50, the upper end surface of the cross joint plate 2, and the bridge deck of the beam 20 are flush. In this embodiment, the elastic surface layer 50 is a material made by adding SBS, light oil, anti-rutting agent, and rubber powder modification material to asphalt-based material and mixing it with 510mm aggregate. A protective cover 16 is detachably connected to the elastic surface layer 50 and covers the upper end of the active rod 524.

[0048] The implementation principle of Example 1 is as follows: When the two beams 20 together with the displacement box 1 on them slide towards each other, the displacement box 1 and the reinforcing member 3 slide towards the expansion joint 40 relative to the cross joint plate 2. The vertical component force provided by the lower end of the diagonal brace 33 compresses the reinforcing rod 32 to move downward relative to the reinforcing 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 reinforcing rod 32, so that the diagonal brace 33 always supports the middle position of the cross joint plate 2. When the two beams 20 together with the displacement box 1 on them slide away from each other, the displacement box 1 and the reinforcing member 3 slide away from the expansion joint 40 relative to the cross joint plate 2. The spring applies a force to the reinforcing rod 32, forcing the reinforcing rod 32 to move upward relative to the reinforcing tube 31, thereby making the diagonal brace 33 always support the middle position of the cross joint plate 2.

[0049] This embodiment also discloses a method for paving a bridge deck expansion joint structure, including the following steps:

[0050] Step S01: Reserve an installation groove 30 at the end of the beam 20;

[0051] Step S02: Install the seamless telescopic device in the installation slot 30; hoist the seamless telescopic device as a whole into the installation slot 30 using hoisting equipment, and lock the support base plate 11 with bolts. During this process, the operator can rotate the active rod 524, which drives 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 adjusting the sliding position of multiple reinforcing sliders 35, adjusting the sliding position of the reinforcing tube 31, and adjusting the preload of the spring so that the spring always supports the reinforcing rod 32.

[0052] Step S03: Install side templates on both sides of the displacement box 1;

[0053] Step S04: Pour the elastic surface layer 50 so that the elastic surface layer 50 is flush with the upper end surface of the cross joint plate 2 and the bridge deck of the beam 20.

[0054] Step S05: Install the protective cover 16, with the upper surface of the protective cover 16 flush with the upper surface of the elastic surface layer 50.

[0055] When the seamless expansion joint device has been used for a period of time and the middle of the cross joint plate 2 shows signs of sagging, in this embodiment, the operator removes the protective cover 16, rotates the active rod 524, and drives 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 enabling multiple reinforcing sliders 35 to slide towards the expansion joint 40. The spring applies a reaction force to the reinforcing rod 32 to increase the supporting force of the diagonal brace 33 on the middle of the cross joint plate 2, so that the middle of the cross joint plate 2 is restored or the degree of sagging in the middle of the cross joint plate 2 is reduced, further improving the service life of the cross joint plate 2 and increasing the maintenance cycle of the cross joint plate 2.

[0056] Example 2:

[0057] The difference between this embodiment and Embodiment 1 is that, referring to... Figure 4 , Figure 5 Each of the two displacement boxes 1 has a toothed groove 111 on one side of its supporting base plate 11. Multiple toothed grooves 111 are provided and spaced apart along the length of the supporting base plate 11. A toothed protrusion 112 is formed between adjacent toothed grooves 111. The toothed protrusions 112 on the two supporting base plates 11 are staggered, allowing the toothed protrusion 112 on one supporting base plate 11 to slide into the toothed groove 111 on the other supporting base plate 11, with the toothed protrusion 112 crossing the expansion joint 40. A reinforcing groove 13 is provided on the toothed protrusion 112, causing the reinforcing members 3 on the two supporting base plates 11 to be staggered. The diagonal braces 33 located on both sides of the expansion joint 40 are arranged crosswise, causing the upper parts of the corresponding diagonal braces 33 to tilt in a direction away from each other.

[0058] The elastic element 34 includes a first airbag 341 built into the displacement groove 12 and a second airbag 342 built into the inner cavity of the reinforcing tube 31. The first airbag 341 is fixedly connected to the inner wall of the displacement groove 12 and to the displacement slide plate 43. An air tube 36 is connected between the first airbag 341 and the second airbag 342. The air tube 36 is a flexible tube.

[0059] The implementation principle of Example 2 is as follows: When the two beams 20, together with the displacement box 1 on them, slide towards each other, the displacement box 1 and the reinforcing member 3 slide relative to the cross joint plate 2 toward the direction closer to the expansion joint 40, and the displacement sliding plate 43 slides relative to the displacement box 1 toward the direction closer to the first airbag 341, thereby compressing the first airbag 341. As the volume of the first airbag 341 decreases, the gas inside the first airbag 341 is collected into the second airbag 342 through the air pipe 36, causing the second airbag 342 to expand. At the same time, the cross joint plate 2 pulls the reinforcing rod 32 upward relative to the reinforcing tube 31 through the lower part of the diagonal brace 33, thereby increasing the inner cavity of the reinforcing tube 31 to provide expansion space for the second airbag 342. After the second airbag 342 expands, it continues to support the reinforcing rod 32, thereby keeping the diagonal brace 33 supporting the second airbag 342. The middle of the cross joint plate 2 is supported; when the two beams 20 together with the displacement box 1 on them slide in opposite directions, the displacement box 1 and the reinforcing member 3 slide away from the expansion joint 40 relative to the cross joint plate 2. The cross joint plate 2 compresses the reinforcing rod 32 through the lower part of the diagonal brace 33, thereby forcing the reinforcing rod 32 to move downward relative to the reinforcing tube 31. The reinforcing rod 32 compresses the second airbag 342. The gas in the second airbag 342 enters the first airbag 341 through the air pipe 36. At the same time, the displacement slide plate 43 slides away from the first airbag 341 relative to the displacement box 1. The second airbag 342 always supports the reinforcing rod 32, which improves the structural strength of the middle of the cross joint plate, thereby reducing the possibility of the cross joint plate deflecting due to the load in the middle and the warping of the two sides of the cross joint plate 2, and improving the service life of the cross joint plate 2.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A seamless expansion joint, characterized by: The utility model provides a kind of displacement box, it includes displacement box (1), cross-plate (2) and reinforcing member (3), the displacement box (1) is provided with two groups, two the opposite sides of displacement box (1) are opened with displacement sliding slot (12) along horizontal, cross-plate (2) is abutted on the upper end surface of displacement box (1), the two sides of cross-plate (2) are provided with connecting piece (4) slidingly connected in displacement sliding slot (12) so that cross-plate (2) can slide relative to displacement box (1), each group reinforcing member (3) includes reinforcing pipe (31), reinforcing rod (32), inclined strut (33) and elastic member (34), reinforcing pipe (31) is arranged in displacement box (1) or beam body (20), reinforcing pipe (31) is vertically arranged, reinforcing rod (32) is axially slidingly inserted in reinforcing pipe (31), one end of inclined strut (33) is hinged in the middle lower end surface of cross-plate (2), the other end of inclined strut (33) is hinged in reinforcing rod (32), and elastic member (34) is arranged between reinforcing pipe (31) and reinforcing rod (32);Each group connecting piece (4) includes connecting vertical plate (41) arranged in the lower end surface of cross-plate (2) and connecting horizontal plate (42) fixedly connected to the lower end surface of connecting vertical plate (41), and connecting horizontal plate (42) is fixedly connected with displacement sliding plate (43) slidingly connected in displacement sliding slot (12), the upper portions of two inclined struts (33) are inclined to each other away, and the elastic member (34) includes first gas bag body (341) built in displacement sliding slot (12) and second gas bag body (342) built in the inner cavity of reinforcing pipe (31), the first gas bag body (341) is fixedly connected to the inner wall of displacement sliding slot (12), the first gas bag body (341) is fixedly connected to displacement sliding plate (43), and the first gas bag body (341) and the second gas bag body (342) are communicated with air pipe (36);The displacement box (1) is fixedly connected with support base plate (11), the reinforcing pipe (31) is slidingly connected with support base plate (11) along horizontal, and the displacement box (1) is provided with adjusting assembly (5) for adjusting the displacement position of reinforcing pipe (31);The lower portion of reinforcing pipe (31) is fixedly connected with reinforcing slider (35) slidingly connected with support base plate (11), and the adjusting assembly (5) includes adjusting screw rod (51) rotationally connected with support base plate (11) and driving part (52) for driving adjusting screw rod (51) to rotate, and adjusting screw rod (51) is threadedly arranged in reinforcing slider (35);The displacement box (1) has mounting cavity (15) below displacement sliding slot (12), one end of adjusting screw rod (51) extends into mounting cavity (15), and the driving part (52) includes linkage rod (521) rotationally connected with the inner wall of mounting cavity (15), first linkage bevel gear (522) fixedly sleeved on linkage rod (521) and second linkage bevel gear (523) built in mounting cavity (15) and fixedly sleeved on the end portion of adjusting screw rod (51), and first linkage bevel gear (522) and second linkage bevel gear (523) are engaged.

2. A seamless expansion joint as defined in claim 1, wherein: Two support base plates (11) are provided with tooth grooves (111) on opposite sides, the tooth grooves (111) are spaced apart along the length direction of the support base plate (11), tooth protrusions (112) are formed between adjacent two tooth grooves (111), the tooth protrusions (112) on the two support base plates (11) are arranged in a staggered manner, so that the tooth protrusion (112) on one support base plate (11) is 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).

3. A seamless expansion joint as defined in claim 1, wherein: The upper portion of the displacement box body (1) is provided with a through hole on the side of the displacement sliding groove (12) in the vertical direction, and the through hole is communicated with the mounting cavity (15). The driving component (52) further includes a driving rod (524) rotatably arranged in the through hole, a first driving bevel gear (525) arranged in the mounting cavity (15) and fixedly sleeved on the driving rod (524), and a second driving bevel gear (526) fixedly sleeved on the linkage rod (521). The upper portion of the driving rod (524) protrudes from the upper end surface of the displacement box body (1). The first driving bevel gear (525) and the second driving bevel gear (526) are in meshing connection. The displacement box body (1) is detachably connected with a protective cover (16) arranged on the upper end of the driving rod (524).

4. A bridge deck joint structure, characterized by: The bridge pier cap beam (10) and a pair of beam bodies (20) supported on the bridge pier cap beam (10) are provided. The two beam bodies (20) are provided with expansion joints (40) between the end faces. The two beam bodies (20) are provided with mounting grooves (30) on the sides close to each other. The mounting grooves (30) are provided with a seamless expansion device according to any one of claims 1 to 3. The displacement box body (1) is mounted on the inner wall of the bottom of the mounting groove (30). The reinforcing pipe (31) is mounted on the displacement box body (1) or the inner wall of the bottom of the mounting groove (30). The upper surface of the displacement box body (1) is provided with an elastic surface layer (50). The elastic surface layer (50) is located between the bridge surface of the beam body (20) and the expansion joint plate (2). The upper end surface of the elastic surface layer (50), the upper end surface of the expansion joint plate (2) and the bridge surface of the beam body (20) are flush.

5. A method of deck joint construction according to claim 4, wherein: The method comprises the following steps: Step S01, reserving a mounting groove (30) at the end of the beam body (20); Step S02, installing a seamless expansion device in the mounting groove (30); the seamless expansion device is hoisted and placed in the mounting groove (30); Step S03, installing side formworks on both sides of the displacement box body (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 expansion joint plate (2) and the bridge surface of the beam body (20). The method comprises the following steps: Step S01, reserving a mounting groove (30) at the end of the beam body (20); Step S02, installing a seamless expansion device in the mounting groove (30); the seamless expansion device is hoisted and placed in the mounting groove (30); Step S03, installing side formworks on both sides of the displacement box body (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 expansion joint plate (2) and the bridge surface of the beam body (20).

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