A bridge expansion joint device with adjustable height and zero on-site welding and its installation method

Abstract

The present invention relates to a height-adjustable, zero-welding, on-site bridge expansion joint device and its installation method. The device comprises a first beam, a second beam, and an expansion joint structure. An expansion joint is reserved between the first beam and the second beam. Mounting slots are provided on both the first beam and the second beam. The two ends of the expansion joint structure are respectively mounted in the two mounting slots. The expansion joint structure is located above the expansion joint. The expansion joint structure comprises a plurality of expansion joint units, which are sequentially connected and arranged along the length of the expansion joint. The expansion joint units comprise a telescopic assembly and an anchor plate adjustment assembly for adjusting the height of the telescopic assembly. The anchor plate adjustment assemblies are located on either side of the telescopic assembly, the telescopic assembly is fixedly connected to the anchor plate adjustment assembly, and the anchor plate adjustment assemblies are fixed in the mounting slots. The present invention can solve the problems of current expansion joint devices requiring on-site welding, difficulty adjusting the installation height, difficulty adapting to new concrete materials, and high maintenance and replacement costs for long expansion joint devices.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge expansion joints, and in particular to a height-adjustable and zero-welding bridge expansion joint device and an installation method thereof. Background Art

[0002] Bridge expansion joints are installed between beam ends, between beam ends and abutments, or at hinged joints to accommodate bridge deck deformation. Existing expansion joint structures require extensive on-site welding of anchor plates and embedded rebar after the joint is installed and positioned. This often results in misalignment between the anchor plates and embedded rebar, creating overlap or large gaps, making on-site welding difficult. The dimensions of the pre-recorded mounting slots in the beams can misalign due to construction errors, making it difficult to adjust the slot dimensions on-site to the actual installation requirements. This significantly impacts the quality of bridge expansion joint installation. The concrete in the anchorage area of ​​traditional expansion joints is prone to damage and requires frequent repairs. Ultra-high performance concrete (UHPC) can effectively address the low concrete strength and susceptibility to spalling and cracking in traditional anchorage areas. However, conventional expansion joint structures struggle to fully utilize the excellent anchoring properties of UHPC, making it difficult to achieve a cost-effective product. Expansion joints on wide bridge decks are very long, requiring multiple lanes to close for repair, severely impacting traffic. Furthermore, the replacement, repair, and transportation costs of long expansion joints are high. Summary of the Invention

[0003] In response to the technical problems existing in the prior art, the first purpose of the present invention is to provide a bridge expansion joint device with adjustable height and zero on-site welding, including an expansion joint structure, which has the advantages of high strength, high cost performance, easy adjustment and installation, easy maintenance, and easy replacement. It can solve the current problems of expansion joint devices requiring on-site welding, difficulty in adjusting the installation height, difficulty in adapting to new concrete materials, and high replacement costs of long expansion joint devices.

[0004] The second purpose of the present invention is to provide an installation method for a bridge expansion joint device that is adjustable in height and requires zero on-site welding. Multiple expansion joint units are arranged in sequence along the length direction of the expansion joint and fixed through a transverse connecting assembly. At the same time, the installation height of the expansion joint assembly is adjusted through an anchor plate adjustment assembly, achieving zero on-site welding, easy positioning, and modular splicing, thereby greatly reducing replacement and maintenance costs and transportation costs.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A bridge expansion joint device with adjustable height and zero on-site welding includes a first beam, a second beam and an expansion joint structure, an expansion joint is reserved between the first beam and the second beam, and mounting grooves are provided on the first beam and the second beam, the two mounting grooves are respectively located on both sides of the expansion joint, the two ends of the expansion joint structure are respectively installed in the two mounting grooves, the expansion joint structure is located above the expansion joint, the expansion joint structure includes a plurality of expansion joint units, and the plurality of expansion joint units are connected and arranged in sequence along the length direction of the expansion joint; the expansion joint unit includes a telescopic assembly and an anchor plate adjustment assembly for adjusting the height of the telescopic assembly, the anchor plate adjustment assembly is located on both sides of the telescopic assembly, the telescopic assembly is fixedly connected to the anchor plate adjustment assembly, and the anchor plate adjustment assembly is fixed in the mounting groove; the telescopic assembly includes a first telescopic part and two second telescopic parts, the two second telescopic parts are respectively installed in the two mounting grooves, and the first telescopic part is movably installed between the two second telescopic parts; the anchor plate adjustment assembly includes a plurality of anchor plates and a plurality of adjustment parts, the plurality of anchor plates are fixedly connected to the outside of the second telescopic part, the adjustment part is fixed to the bottom of the anchor plate, and the adjustment part is fixed in the mounting groove.

[0007] Furthermore, the first telescopic member includes a top plate and an I-shaped plywood, the top plate is located above the I-shaped plywood, and first telescopic grooves are provided on both sides of the bottom of the top plate, and the I-shaped plywood includes an integrally formed upper plywood, a connecting plywood and a lower plywood, and the upper plywood and the top plate are fixedly connected; the second telescopic member includes a fixedly connected upper connecting plate, a middle connecting plate and a bottom plate, and a second telescopic groove is provided on one side of the bottom of the upper connecting plate, and the second telescopic grooves of the two second telescopic members respectively correspond to the first telescopic grooves on both sides of the bottom of the top plate, and the middle connecting plates of the two second telescopic members are respectively located in the grooves on both sides of the I-shaped plywood, and a third telescopic groove is provided on one side of the bottom of the middle connecting plate, and the two sides of the lower plywood are respectively located in the third telescopic grooves of the two second telescopic members.

[0008] Furthermore, a plurality of telescopic springs are arranged at intervals on both sides of the lower splint, and a plurality of notches are correspondingly provided on the inner sides of the third telescopic through slots of the two second telescopic members, and the telescopic springs are in conflict with the notches.

[0009] Furthermore, the telescopic assembly also includes a rubber waterstop, and two sides of the rubber waterstop are respectively installed in the second telescopic through groove and the first telescopic through groove.

[0010] Furthermore, the anchor plate adjustment assembly also includes multiple embedded steel bars and multiple through bars. The embedded steel bars are fixed in the installation groove. The embedded steel bars are located on the front and rear sides of the anchor plate. The anchor plate is provided with multiple through holes. The multiple through bars correspond to the through holes that pass through the multiple anchor plates and are tied to the embedded steel bars.

[0011] Furthermore, the adjustment part includes an adjustment plate, which is fixedly connected to the bottom of the anchor plate. The adjustment plate is provided with multiple adjustment holes, which are located on both sides of the anchor plate. Adjustment bolts are installed in the adjustment holes, and adjustment nuts are connected to the adjustment bolts. The bottom of the adjustment bolts is fixed in the installation groove.

[0012] Furthermore, two adjacent expansion joint units are connected by a transverse connecting assembly, which includes a first connecting stud and two second connecting studs. Two adjacent first telescopic members are connected by the first connecting stud, and two adjacent second telescopic members are connected by the second connecting stud; a connecting hole is provided on the top plate at one end of the first telescopic member, and a connecting hole is provided on the I-shaped plywood at the other end of the first telescopic member. The first connecting stud passes through the connecting hole at one end of one of the first telescopic members and the connecting hole at the other end of the adjacent first telescopic member and is fixed by a first connecting nut; a connecting hole is provided on the upper connecting plate and the bottom plate at one end of the second telescopic member, and a connecting hole is provided on the middle connecting plate at the other end of the second telescopic member. The second connecting stud passes through the connecting hole at one end of one of the second telescopic members and the connecting hole at the other end of the adjacent second telescopic member and is fixed by a second connecting nut.

[0013] Furthermore, rubber pads are provided on both sides of the top of the lower splint, and a rubber pad is provided on the bottom of the lower splint.

[0014] A method for installing a bridge expansion joint device with adjustable height and zero on-site welding comprises the following steps:

[0015] S1. Opening mounting grooves on the first beam and the second beam respectively;

[0016] S2. Install anchor plate adjustment assemblies on both sides of the expansion joint assembly to form an expansion joint unit;

[0017] S3. Install the expansion joint unit in the installation slot and adjust the height of the expansion joint assembly using the anchor plate adjustment assembly so that the top surface of the expansion joint assembly is flush with the bridge pavement.

[0018] S4, arranging the plurality of expansion joint units in sequence along the length direction of the expansion joint, and connecting and fixing them through a transverse connecting assembly;

[0019] S5. Insert the through-bars into the anchor plates and tie them to the embedded steel bars, install the casting formwork, and adjust the position of the telescopic assembly;

[0020] S6. Pour anchoring concrete into the installation groove to complete the installation of the expansion joint structure.

[0021] The present invention has the following advantages:

[0022] 1. The expansion joint structure of the present invention has the advantages of high strength, high cost performance, easy adjustment and installation, easy maintenance, and easy replacement. At the same time, the anchor plate adjustment component is adopted to adjust the installation height of the expansion joint structure according to actual needs, ensuring the flatness of the expansion joint structure and the bridge road surface. In addition, it is adapted to new high-performance concrete materials and utilizes the excellent anchoring performance of ultra-high-performance anchor concrete and steel bars to achieve zero on-site welding and easy positioning, thereby ensuring the installation effect of the expansion joint structure.

[0023] 2. The telescopic assembly of the present invention, through the corresponding interference between the telescopic spring of the first telescopic member and the notch inside the third telescopic slot of the second telescopic member, can better achieve relative displacement between the first telescopic member and the second telescopic member, so that the telescopic assembly has good shock-resistant and buffering effect; by sticking rubber pads to the top sides of the lower splint of the first telescopic member and the bottom of the lower splint, wear between the lower splint and the third telescopic slot is prevented, which also plays a buffering role.

[0024] 3. The expansion joint structure of the present invention includes multiple expansion joint units, which are connected in sequence along the length direction of the expansion joint. Two adjacent expansion joint units are connected by a transverse connecting assembly, which is easy to install and simple to repair and replace. When an expansion joint unit is damaged and needs repair, it is only necessary to close the corresponding lane, which will not affect normal traffic. The replacement and maintenance costs and transportation costs are greatly reduced, and the problem of high replacement costs of long expansion joint devices is solved.

[0025] 4. The expansion joint unit of the present invention is cast in the installation groove using ultra-high performance anchoring concrete, so that the anchoring concrete is tightly fixed to the second expansion member. At the same time, the steel bar skeleton formed by through-bars and embedded steel bars is used to tightly fix the expansion joint unit and the beam body, thereby ensuring the stability of the expansion joint unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the bridge expansion joint device of the present invention that can be adjusted in height and has zero on-site welding.

[0027] Figure 2 yes Figure 1 Top view of .

[0028] Figure 3 yes Figure 2 Cross-sectional view at AA.

[0029] Figure 4 It is a structural schematic diagram of the first telescopic member of the present invention.

[0030] Figure 5 It is a structural schematic diagram of the second telescopic member of the present invention.

[0031] Figure 6 It is a structural schematic diagram of the anchor plate adjustment assembly of the present invention.

[0032] Figure 7 It is a structural schematic diagram of the connection of two first telescopic members of the present invention.

[0033] Figure 8 It is a structural schematic diagram of the connection of two second telescopic members of the present invention.

[0034] Among them, 1 is the beam body, 101 is the first beam body, 102 is the second beam body, 103 is the expansion joint, 104 is the installation groove, E is the expansion joint unit, 2 is the telescopic assembly, 201 is the first telescopic member, 201a is the top plate, 201b is the I-shaped splint, 201c is the upper splint, 201d is the connecting splint, 201e is the lower splint, 201f is the first telescopic through groove, 201g is the connecting hole, 201h is the telescopic spring, 201i is the rubber pad, 202 is the second telescopic member, 202a is the upper connecting plate, 202b is the middle connecting plate, 202c is the bottom Plate, 202d is the second telescopic through slot, 202e is the third telescopic through slot, 202f is the notch, 203 is the rubber waterstop, 3 is the anchor plate adjustment assembly, 301 is the anchor plate, 301a is the anchor plate through hole, 302 is the adjustment part, 302a is the adjustment plate, 302b is the adjustment hole, 302c is the adjustment bolt, 302d is the adjustment nut, 303 is the embedded steel bar, 304 is the through bar, 4 is the transverse connection assembly, 401 is the first connection stud, 402 is the second connection stud, 403 is the first connection nut, 404 is the second connection nut, and 5 is the bridge pavement. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1-3As shown, a bridge expansion joint device with adjustable height and zero on-site welding includes a first beam body, a second beam body and an expansion joint structure, an expansion joint is reserved between the first beam body and the second beam body, and mounting grooves are provided on the first beam body and the second beam body, the two mounting grooves are respectively located on both sides of the expansion joint, the two ends of the expansion joint structure are respectively installed in the two mounting grooves, the expansion joint structure is located above the expansion joint, the expansion joint structure includes a plurality of expansion joint units, and the plurality of expansion joint units are connected and arranged in sequence along the length direction of the expansion joint; the expansion joint unit includes a telescopic assembly and an anchor plate adjustment assembly for adjusting the height of the telescopic assembly, the anchor plate adjustment assembly is located on both sides of the telescopic assembly, the telescopic assembly is fixedly connected to the anchor plate adjustment assembly, and the anchor plate adjustment assembly is fixed in the mounting groove; the telescopic assembly includes a first telescopic part and two second telescopic parts, the two second telescopic parts are respectively installed in the two mounting grooves, and the first telescopic part is movably installed between the two second telescopic parts; the anchor plate adjustment assembly includes a plurality of anchor plates and a plurality of adjustment parts, the plurality of anchor plates are fixedly connected to the outside of the second telescopic part, the adjustment part is fixed to the bottom of the anchor plate, and the adjustment part is fixed in the mounting groove. In this embodiment, the anchor plate is welded to the outside of the first telescopic member, and the adjustment member is welded to the bottom of the anchor plate. A bridge pavement is provided above the first beam and the second beam, and the bridge pavement is flush with the top of the telescopic assembly.

[0037] like Figure 3-5 As shown, the first telescopic member includes a top plate and an I-shaped plywood, the top plate is located above the I-shaped plywood, and first telescopic grooves are provided on both sides of the bottom of the top plate, and the I-shaped plywood includes an integrally formed upper plywood, a connecting plywood and a lower plywood, and the upper plywood and the top plate are fixedly connected; the second telescopic member includes a fixedly connected upper connecting plate, a middle connecting plate and a bottom plate, and a second telescopic groove is provided on one side of the bottom of the upper connecting plate, and the second telescopic grooves of the two second telescopic members respectively correspond to the first telescopic grooves on both sides of the bottom of the top plate, and the middle connecting plates of the two second telescopic members are respectively located in the grooves on both sides of the I-shaped plywood, and a third telescopic groove is provided on one side of the bottom of the middle connecting plate, and the two sides of the lower plywood are respectively located in the third telescopic grooves of the two second telescopic members.

[0038] like Figure 1-3 As shown, multiple telescopic springs are arranged at intervals on both sides of the lower splint, and multiple notches are correspondingly provided on the inner side of the third telescopic groove of the two second telescopic members. The telescopic springs conflict with the notches, and the reserved length of the telescopic springs is long enough to keep the telescopic springs in a compressed state at all times, thereby achieving a good anti-seismic buffering effect. Rubber pads are provided on both sides of the top of the lower splint, and a rubber pad is provided on the bottom of the lower splint to prevent wear between the lower splint and the third telescopic groove, which can play a buffering role. The telescopic assembly also includes a rubber waterstop, and both sides of the rubber waterstop are respectively installed in the second telescopic groove and the first telescopic groove. The rubber waterstop can play a role in isolating water and dirt.

[0039] like Figure 1 and Figure 6 As shown, the anchor plate adjustment assembly also includes multiple embedded steel bars and multiple through bars. The embedded steel bars are fixed in the installation groove. The embedded steel bars are located on the front and rear sides of the anchor plate. Multiple through holes are provided on the anchor plate. The number and size of the through holes on the anchor plate can be customized as needed. Multiple through bars correspond to the through holes that pass through multiple anchor plates and are tied to the embedded steel bars to form a steel skeleton. During on-site installation, the position of the through bars in the through holes can be adjusted as needed to facilitate the binding of the through bars and the embedded steel bars. After the ultra-high performance anchor concrete is poured in the installation groove, the ultra-high performance anchor concrete can form a better connection and fixing effect with the steel skeleton. The ultra-high performance anchor concrete has higher compressive strength, and the pull-out resistance between the ultra-high performance anchor concrete and the telescopic assembly is better.

[0040] like Figure 1 and Figure 6 As shown, the adjustment member includes an adjustment plate, which is fixedly connected to the bottom of the anchor plate. The adjustment plate is provided with multiple adjustment holes, located on both sides of the anchor plate. Adjustment bolts are installed in the adjustment holes, and adjustment nuts are connected to the adjustment bolts. The bottom of the adjustment bolts is fixed in the mounting slot. In this embodiment, the adjustment plate is a steel plate welded to the bottom of the anchor plate. In actual application, the number and size of the holes in the steel plate can be customized as needed. The adjustment bolts are used to adjust the adjustment plate upward or downward. The adjustment plate drives the anchor plate, which in turn drives the telescopic assembly to achieve height adjustment of the telescopic assembly. This allows the telescopic assembly to adjust its height according to the actual size of the mounting slot, ensuring the required flatness between the telescopic assembly and the bridge pavement.

[0041] Since the anchor plate has been pre-welded to the outside of the first telescopic member, the adjustment plate of the adjustment member is pre-welded to the bottom of the anchor plate, and the embedded steel bars have been pre-buried in the installation groove, during on-site installation, it is only necessary to install the adjustment bolt of the adjustment member in the installation groove, and adjust the height of the telescopic assembly by adjusting the nut so that the top surface of the telescopic assembly is flush with the bridge pavement, and then pass the through-bars through the through holes of multiple anchor plates and tie them to the embedded steel bars, and then pour ultra-high performance anchoring concrete, so that the expansion joint structure can be efficiently and firmly installed in the installation groove, and no welding is required on site, which can achieve the technical effect of adjustable telescopic assembly height and zero welding on site.

[0042] like Figure 7 and Figure 8As shown, two adjacent expansion joint units are connected by a transverse connecting assembly, which includes a first connecting stud and two second connecting studs. Two adjacent first expansion joints are connected by the first connecting stud, and two adjacent second expansion joints are connected by the second connecting stud. A connecting hole is provided on the top plate at one end of the first expansion joint, and a connecting hole is provided on the I-shaped clamping plate at the other end of the first expansion joint. The first connecting stud passes through the connecting hole at one end of one first expansion joint and the connecting hole at the other end of the adjacent first expansion joint, and is fixed by a first connecting nut. A connecting hole is provided on the upper connecting plate and the bottom plate at one end of the second expansion joint, and a connecting hole is provided on the middle connecting plate at the other end of the second expansion joint. The second connecting stud passes through the connecting hole at one end of one second expansion joint and the connecting hole at the other end of the adjacent second expansion joint, and is fixed by a second connecting nut. The transverse connecting assembly realizes transverse modular connection of multiple expansion joint units, making it easy to repair and replace.

[0043] A method for installing a bridge expansion joint device with adjustable height and zero on-site welding comprises the following steps:

[0044] S1. Open installation grooves on the first beam and the second beam respectively, and perform cutting and cleaning;

[0045] S2. Install anchor plate adjustment assemblies on both sides of the telescopic assembly to form an expansion joint unit. Specifically, pre-weld multiple anchor plates to the outside of the second telescopic member, pre-weld the adjustment member to the bottom of the anchor plates, adhere rubber pads to both sides of the top of the lower clamping plate of the first telescopic member and to the bottom of the lower clamping plate. Install the first telescopic member between the two second telescopic members, and adjust the telescopic springs on both sides of the lower clamping plate of the first telescopic member so that the telescopic springs contact the notches inside the third telescopic slot of the second telescopic member.

[0046] S3. Install the expansion joint unit in the installation slot and adjust the height of the expansion joint assembly using the anchor plate adjustment assembly. Specifically, adjust the adjustment plate by adjusting the adjustment bolt and adjustment nut to move the adjustment plate upward or downward. The adjustment plate drives the anchor plate to move, and the anchor plate drives the expansion joint assembly to move, so as to adjust the height of the expansion joint assembly so that the top surface of the expansion joint assembly is flush with the bridge pavement. Then, install a rubber waterstop between the second expansion joint slot and the first expansion joint slot.

[0047] S4. Arrange the plurality of expansion joint units sequentially along the length direction of the expansion joint and secure them via a transverse connecting assembly. Specifically, connect and secure two adjacent first expansion joints via a first connecting stud and a first connecting nut, and connect and secure two adjacent second expansion joints via a second connecting stud and a second connecting nut.

[0048] S5. Insert the through-rebars into the anchor plates and tie them to the embedded steel bars. Install the casting formwork. That is, multiple through-rebars corresponding to the through holes of multiple anchor plates are tied to the embedded steel bars. Adjust the position of the telescopic assembly.

[0049] S6. Pour anchoring concrete into the installation groove to complete the installation of the expansion joint structure. The anchoring concrete is ultra-high performance anchoring concrete.

[0050] In general, the expansion joint structure of the present invention has the advantages of high strength, high cost performance, easy adjustment and installation, easy maintenance, and easy replacement. At the same time, the anchor plate adjustment assembly is adopted to adjust the installation height of the expansion joint structure according to actual needs, ensuring the flatness of the expansion joint structure and the bridge pavement. It is also suitable for new high-performance concrete materials, and utilizes the excellent anchoring performance of ultra-high-performance anchoring concrete and steel bars to achieve zero welding on site and easy positioning, ensuring the installation effect of the expansion joint structure. The telescopic assembly of the present invention, through the corresponding interference between the telescopic spring of the first telescopic member and the notch on the inner side of the third telescopic slot of the second telescopic member, can better achieve relative displacement between the first telescopic member and the second telescopic member, so that the telescopic assembly has a good anti-seismic buffering effect; by sticking rubber pads to the top two sides of the lower splint of the first telescopic member and the bottom of the lower splint, wear between the lower splint and the third telescopic slot is prevented, which also plays a buffering role. The expansion joint structure of the present invention includes multiple expansion joint units, which are sequentially connected along the length of the expansion joint. Adjacent expansion joint units are connected by a transverse connecting assembly, making installation and maintenance simple. When a damage expansion joint unit requires repair, only the corresponding lane needs to be closed, without affecting normal traffic. This significantly reduces replacement, maintenance, and transportation costs, solving the high replacement cost of long expansion joints. The expansion joint unit of the present invention is cast in the installation groove using ultra-high-performance anchoring concrete, which tightly secures the anchoring concrete to the second expansion member. A steel reinforcement skeleton formed by through-reinforcement and pre-embedded steel bars secures the expansion joint unit to the beam, ensuring its stability.

[0051] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A bridge expansion joint device with adjustable height and zero on-site welding, characterized by: The expansion joint structure comprises a first beam body, a second beam body and an expansion joint structure, wherein an expansion joint is reserved between the first beam body and the second beam body, and mounting grooves are provided on both the first beam body and the second beam body, the two mounting grooves are respectively located on both sides of the expansion joint, and the two ends of the expansion joint structure are respectively installed in the two mounting grooves, and the expansion joint structure is located above the expansion joint, and the expansion joint structure comprises a plurality of expansion joint units, and the plurality of expansion joint units are sequentially connected and arranged along the length direction of the expansion joint; The expansion joint unit includes a telescopic assembly and an anchor plate adjustment assembly for adjusting the height of the telescopic assembly. The anchor plate adjustment assembly is located on both sides of the telescopic assembly. The telescopic assembly is fixedly connected to the anchor plate adjustment assembly, and the anchor plate adjustment assembly is fixed in the installation slot. The telescopic assembly includes a first telescopic member and two second telescopic members, the two second telescopic members are respectively installed in two installation grooves, and the first telescopic member is movably installed between the two second telescopic members; The anchor plate adjustment assembly includes a plurality of anchor plates and a plurality of adjustment members, wherein the plurality of anchor plates are fixedly connected to the outside of the second telescopic member, and the adjustment members are fixed to the bottom of the anchor plates, and the adjustment members are fixed in the mounting groove; The first telescopic member includes a top plate and an I-shaped plywood, the top plate is located above the I-shaped plywood, and both sides of the bottom of the top plate are provided with a first telescopic through groove, the I-shaped plywood includes an integrally formed upper plywood, a connecting plywood and a lower plywood, and the upper plywood and the top plate are fixedly connected; the second telescopic member includes a fixedly connected upper connecting plate, a middle connecting plate and a bottom plate, one side of the bottom of the upper connecting plate is provided with a second telescopic through groove, the second telescopic through grooves of the two second telescopic members respectively correspond to the first telescopic through grooves on both sides of the bottom of the top plate, the middle connecting plates of the two second telescopic members are respectively located in the through grooves on both sides of the I-shaped plywood, and one side of the bottom of the middle connecting plate is provided with a third telescopic through groove, and both sides of the lower plywood are respectively located in the third telescopic through grooves of the two second telescopic members; Multiple telescopic springs are arranged at intervals on both sides of the lower splint, and multiple notches are correspondingly provided on the inner sides of the third telescopic through slots of the two second telescopic members, and the telescopic springs are in conflict with the notches; The anchor plate adjustment assembly further includes a plurality of embedded steel bars and a plurality of through bars. The embedded steel bars are fixed in the installation groove. The embedded steel bars are located at the front and rear sides of the anchor plate. The anchor plate is provided with a plurality of through holes. The plurality of through bars correspond to the through holes of the plurality of anchor plates and are tied to the embedded steel bars. The adjustment part includes an adjustment plate, which is fixedly connected to the bottom of the anchor plate. The adjustment plate is provided with multiple adjustment holes, which are located on both sides of the anchor plate. Adjustment bolts are installed in the adjustment holes, and adjustment nuts are connected to the adjustment bolts. The bottom of the adjustment bolts is fixed in the installation groove.

2. The height-adjustable and zero-welding bridge expansion joint device according to claim 1 is characterized in that: The telescopic assembly also includes a rubber waterstop, and two sides of the rubber waterstop are respectively installed in the second telescopic through groove and the first telescopic through groove.

3. The height-adjustable and zero-welding bridge expansion joint device according to claim 1 is characterized in that: Two adjacent expansion joint units are connected by a transverse connecting assembly, which includes a first connecting stud and two second connecting studs. Two adjacent first telescopic members are connected by the first connecting stud, and two adjacent second telescopic members are connected by the second connecting stud; a connecting hole is provided on the top plate at one end of the first telescopic member, and a connecting hole is provided on the I-shaped plywood at the other end of the first telescopic member. The first connecting stud passes through the connecting hole at one end of one of the first telescopic members and the connecting hole at the other end of the adjacent first telescopic member and is fixed by a first connecting nut; a connecting hole is provided on the upper connecting plate and the bottom plate at one end of the second telescopic member, and a connecting hole is provided on the middle connecting plate at the other end of the second telescopic member. The second connecting stud passes through the connecting hole at one end of one of the second telescopic members and the connecting hole at the other end of the adjacent second telescopic member and is fixed by a second connecting nut.

4. The height-adjustable and zero-welding bridge expansion joint device according to claim 1 is characterized in that: Rubber pads are provided on both sides of the top of the lower splint, and a rubber pad is provided on the bottom of the lower splint.

5. A method for installing a height-adjustable and zero-welding bridge expansion joint device according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Opening mounting grooves on the first beam and the second beam respectively; S2. Install anchor plate adjustment assemblies on both sides of the expansion joint assembly to form an expansion joint unit; S3. Install the expansion joint unit in the installation slot and adjust the height of the expansion joint assembly using the anchor plate adjustment assembly so that the top surface of the expansion joint assembly is flush with the bridge pavement. S4, arranging the plurality of expansion joint units in sequence along the length direction of the expansion joint, and connecting and fixing them through a transverse connecting assembly; S5. Insert the through-bars into the anchor plates and tie them to the embedded steel bars, install the casting formwork, and adjust the position of the telescopic assembly; S6. Pour anchoring concrete into the installation groove to complete the installation of the expansion joint structure.

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