A replaceable polyurethane seamless expansion device for longitudinal joint of a widened bridge and a method for installing and replacing the same

Abstract

This invention relates to the field of bridge engineering technology, specifically disclosing a replaceable polyurethane seamless expansion joint device for longitudinal joints in bridge widening projects and its installation and replacement method. It includes an embedded base frame, a first expansion joint, a second expansion joint, and a support unit. Each expansion joint is detachably connected to the embedded base frame via double-threaded bolts. The support unit is positioned between the two expansion joints with deformation gaps on both sides. A through hole is provided on the anchor pipe to allow on-site cast polyurethane elastic matrix to flow in and solidify, forming a mechanical locking structure. The lip-shaped waterproof surface at the bottom of the support plate elastically presses against the support seat to form an independent waterproof seal. Replacement only requires removing the bolts to lift the old joint module entirely, preserving the original embedded foundation. This invention divides the expansion joint device into a permanent embedded foundation and a replaceable upper module, realizing a shift in force transmission from interfacial adhesion to mechanical interlocking, solving the technical problems of existing technologies requiring concrete removal for maintenance, easy detachment of force transmission components, and inability to quickly replace components.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a replaceable polyurethane seamless expansion joint device for widening the longitudinal joint of a bridge and its installation and replacement method. Background Technology

[0002] Bridge expansion joints are important auxiliary components in bridge structures, typically installed at beam ends, abutments, or structural deformation joints. They are used to accommodate relative displacements of the bridge structure caused by factors such as temperature changes, concrete shrinkage and creep, vehicle loads, and foundation displacement, ensuring the continuity, comfort, and safety of traffic on the bridge deck. Traditional bridge expansion joints include steel expansion joints, modular expansion joints, comb-plate expansion joints, and seamless expansion joints.

[0003] Seamless expansion joints typically involve placing elastomers, elasto-plastic materials, resins, or polyurethanes within the expansion joint groove of a bridge, creating a relatively continuous driving surface between the expansion joint and the bridge deck pavement. This type of structure can adapt to bridge displacement through the tensile, compressive, or shear deformation of the material itself, resulting in a continuous bridge surface, smooth driving, reduced vehicle impact, and low noise. Polyurethane materials, with their good elasticity, wear resistance, fatigue resistance, and castability, have also been used in seamless or prefabricated bridge expansion joint structures in recent years.

[0004] With the increasing number of reconstruction and expansion projects for existing highways and municipal bridges, bridge widening has become a common engineering practice. Widened bridges typically consist of an existing bridge and a newly constructed widened bridge, with a longitudinal joint or expansion joint formed between the old and new bridges along the longitudinal direction. This longitudinal joint differs from ordinary transverse expansion joints at beam ends; it extends continuously along the traffic direction and is affected by differences in structural stiffness, shrinkage and creep, temperature deformation, foundation settlement, differential deformation of the bridge deck pavement, and repeated vehicle loads. Therefore, it is usually necessary to simultaneously consider requirements such as lateral opening and closing, vertical displacement, bridge deck continuity, waterproofing, vibration reduction, and subsequent maintenance.

[0005] Currently, longitudinal joint expansion joint devices for widened bridges have become a specialized technical area. The national standard plan, "Technical Conditions for Longitudinal Expansion Joints of Urban Bridges," lists comb-type longitudinal joint expansion joint devices, modular longitudinal joint expansion joint devices, and high-strain ECC concrete longitudinal joint expansion joint devices as the main structural types. The China Communications and Transportation Association has also published the group standard "Longitudinal Joint Expansion Joint Devices for Widened Bridges" (T / CCTAS 208-2025). All of these standards indicate that longitudinal joint expansion joint devices for widened bridges have clear specialized requirements in engineering applications.

[0006] Existing methods for treating longitudinal joints in widened bridges mainly include rigid connections, continuous pavement, elastic caulking, steel plate joints, rubber waterstops, elastic joints, and the retrofitting of ordinary bridge expansion joints. Specifically, existing technical solutions fall into the following categories: Traditional seamless expansion joints typically involve filling the pre-reserved grooves in bridge expansion joints with a high-viscosity elastic-plastic material, creating a continuous surface between the expansion joint and the bridge deck pavement. Common seamless expansion joint technologies include polymer-based seamless expansion joints, TST elastic-plastic seamless expansion joints, and modified asphalt seamless expansion joints. These structures usually use polymers or high-viscosity elastic-plastic materials as the main deformable material, which are melted at high temperatures and then mixed with aggregates such as crushed stone to form an elastic-plastic crushed stone mixture. This mixture is then spread and hardened in the pre-reserved grooves of the beam expansion joint. For example, patent "CN109778688B, A Seamless Expansion Joint Device" discloses a seamless expansion joint device including a wear-resistant body component, an anchoring component, and a gap connector. To achieve the prefabrication of seamless expansion joint structures, existing technologies propose combining components such as the wear-resistant body, anchoring component, and gap connector into prefabricated seamless expansion joints. For example, the expansion joint device body disclosed in patent CN109778688B includes a wear body assembly, an anchoring assembly, and a gap connector. The wear body assembly is anchored to the gap between two beam sections by the anchoring assembly.

[0007] Polyurethane materials are also used in prefabricated bridge expansion joint structures. For example, patent CN113445416A, "A Prefabricated Large Expansion Polyurethane Expansion Joint Device and Its Construction Method," discloses an expansion joint solution comprising a prefabricated polyurethane expansion joint, polyurethane concrete, a cross-joint steel plate, and an adhesive. In this solution, the gap between the prefabricated polyurethane expansion joint and the expansion joint groove area is filled with polyurethane concrete, forming an expansion joint structure that combines the prefabricated polyurethane elastomer with the on-site polyurethane concrete.

[0008] For bridge widening joints, existing technologies have proposed using seamless expansion joint structures. For example, patent CN111705640A, "A Seamless Expansion Joint Structure for Bridge Joint Treatment and Its Construction Process," discloses a seamless expansion joint structure applied to the expansion joint between the original mainline box girder and the widened box girder. This solution consists of components such as a steel plate slab across the joint, installation components, elastic expansion components, waterproof adhesive, and a waterproof layer.

[0009] For the longitudinal joint of the splicing structure between new and old bridges, patent "CN114016446A, an elastic joint for bridge widening structure and its construction method" discloses an elastic joint scheme including a stiffening steel plate, rubber, elastic material and anchors. The stiffening steel plate is set on the longitudinal joint, rubber is set around the steel plate, and elastic material is filled on the steel plate.

[0010] In the existing technology, there are also solutions that use precast blocks to form seamless expansion joints. For example, "Patent CN202787067U, a seamless expansion joint structure for bridges" discloses a structure in which a sponge is filled in the gap between adjacent beams, a steel cover plate is set above the gap, and TST reinforced crushed stone precast blocks are bonded and fixed in the reserved groove by adhesive.

[0011] However, when existing seamless expansion joint structures are damaged, the old polyurethane and grooved concrete must be cut and removed, and the reinforcing steel bars must be re-tied and re-installed. Using a pneumatic drill to remove the original concrete and re-drill holes for rebar installation causes significant and irreversible damage to the original concrete structure. The repair process involves a series of complex steps, including cutting the joint, grooving, removing the old joint, installing rebar, installing the expansion device, tying the rebar, pouring concrete, and curing. This results in a long construction period and prolonged traffic closures.

[0012] Existing expansion joints typically couple expansion joint functions such as expansion deformation, load transmission, and waterproofing into a single cast-in-place or bonded system, with anchoring methods heavily reliant on interface adhesion or concrete embedding. Under long-term vehicle loads, temperature cycles, concrete shrinkage and creep, differential deformation between new and old bridges, and rainwater erosion, problems such as debonding of the elastomer from the concrete interface, localized tearing of the joint, waterproofing layer failure, and unstable anchoring force transmission can easily occur. Many existing bridge expansion joints on both new and old bridges directly utilize existing bridge expansion joints, which cannot meet the displacement requirements between the two bridges, leading to easy damage to the devices and compromising the structural safety and service life of the product.

[0013] In existing technical solutions, the anchoring foundation and the joint body of the expansion joint are an integrated structure. There is a lack of structural design that allows for the removal of the connectors and replacement of the entire joint body module while preserving the original groove concrete and embedded foundation. When an expansion joint is damaged, the removal of the old expansion joint requires destructive operations such as cutting and breaking, making non-destructive removal and rapid replacement impossible. Summary of the Invention

[0014] In view of this, the present invention provides a replaceable polyurethane seamless expansion joint device for longitudinal joints of bridges widening and an installation and replacement method thereof, in order to solve the problem that existing expansion joint devices for longitudinal joints of bridges widening couple functions such as expansion deformation, load transmission, waterproof sealing and later maintenance are coupled in the same permanent cast-in-place system, which leads to the need to destroy the original structure during maintenance and replacement, the reliance on interface adhesion for load transmission which is prone to detachment and failure, and the lack of independent waterproof and shock-absorbing structure, thus failing to meet the requirement of quick replacement without chiseling.

[0015] In a first aspect, embodiments of the present invention provide a replaceable polyurethane seamless expansion joint for longitudinal joints in bridge widening projects, disposed within the longitudinal joint groove between the old and new beams of the bridge widening project, comprising: An embedded base frame is fixedly installed within the slot. The first telescopic part and the second telescopic part are arranged opposite to each other above the pre-embedded base frame, and a predetermined distance is left between them; A support portion is disposed between the first telescopic portion and the second telescopic portion, and deformation gaps are respectively left between the support portion and the first telescopic portion and the second telescopic portion on both sides. And a polyurethane elastic matrix is ​​filled into the groove and covers the support, the first telescopic part and the second telescopic part, and a portion of the polyurethane material is filled into the interior of the first telescopic part and the second telescopic part and cured to form a mechanical locking structure. The first telescopic part and the second telescopic part are detachably connected to the pre-embedded base frame through detachable connectors. The first telescopic part, the second telescopic part, the support part and the polyurethane elastic matrix together constitute the upper sewing module to realize the overall replacement of the upper sewing module.

[0016] Preferably, the embedded base frame includes a first embedded base pipe and a second embedded base pipe symmetrically arranged on both sides of the longitudinal joint; The first telescopic part and the second telescopic part are respectively disposed above the first pre-embedded bottom pipe and the second pre-embedded bottom pipe, and the inner sides of the first telescopic part and the second telescopic part are respectively provided with reinforcing parts; The support portion is disposed on the reinforcing portion of the first telescopic portion and the second telescopic portion.

[0017] Preferably, an anchoring sleeve is fixedly provided on the pre-embedded base frame, and the first telescopic part and the second telescopic part respectively include anchoring pipes, and the anchoring pipes are detachably connected to the anchoring sleeve by double threaded bolts.

[0018] Preferably, the embedded base frame and the anchor pipe are both configured as through-type tubular components, with several through holes opened along the axial and / or circumferential directions on the pipe wall. The through holes are connected to the inner cavity of the pipe and are used to allow the poured polyurethane material to flow in and solidify to form a mechanical locking structure.

[0019] Preferably, the anchor sleeve is fixedly mounted on the pre-embedded base frame; The lower part of the double-threaded bolt is threadedly connected to the anchoring sleeve; A threaded shim is provided between the bottom of the anchoring pipe and the upper end of the anchoring sleeve; The upper end of the anchoring pipe is provided with an elastic assembly plug, and the upper part of the double threaded bolt passes through the threaded shim block and is threadedly connected to the elastic assembly plug.

[0020] Preferably, the reinforcing part includes a plurality of reinforcing ribs spaced apart on the inner sidewall of the embedded base frame along the longitudinal seam direction, and reinforcing anchor rings fixedly disposed on the reinforcing ribs; The support portion is provided with a support seat for placing the support portion by means of several reinforcing ribs; The support seats of the first telescopic part and the second telescopic part are arranged facing each other to form a waterproof layer receiving cavity between them.

[0021] Preferably, the support includes a support plate and a baffle disposed above the support plate, the support plate being placed on the support base; The baffle is fixed to the top of the support plate by an anchor sleeve.

[0022] Preferably, the support plate includes a rigid support core plate and an elastic layer disposed outside the rigid support core plate; The bottom of the support plate is provided with a lip-shaped waterproof surface, which forms an elastic compression contact with the support surface of the support base after installation.

[0023] Secondly, a method for installing and replacing a replaceable polyurethane seamless expansion joint device for longitudinal joints of bridges with widening is provided, including an installation construction method and a replacement construction method. The installation and construction method includes the following steps: Step 1: Place the pre-embedded base frame into the cleaned longitudinal groove and fix it in place; place temporary filling material in the longitudinal gap. Step 2: Pour the anchoring concrete in the groove, cure it to the design strength, and then clean and level it. Step 3: Place the support unit into the waterproof layer cavity, connect each anchor pipe to the corresponding anchor sleeve with a double-threaded bolt, and install the elastic assembly plug. Step 4: Pour polyurethane material into the groove cavity, and after curing, form the polyurethane elastic matrix; The replacement construction method includes the following steps: Step A: Remove each of the elastic assembled plugs and remove each of the double threaded bolts to disconnect all mechanical connections between the upper seam module and the embedded base frame; Step B: Connect the lifting bolts to the lifting thread holes of each of the threaded shims, and lift the old upper seam module as a whole using the lifting equipment; Step C: Clean the remaining longitudinal grooves, embedded base frame and anchor sleeve, install the new support and new anchor pipe, and tighten the new double threaded bolts and flexible assembled plugs; Step D: Re-pour the polyurethane material, which will cure to form a new polyurethane elastic matrix.

[0024] Preferably, after the old upper seam module is removed as a whole, the original groove anchoring concrete, embedded base frame and anchoring sleeve are all retained in their original positions for the installation of the new upper seam module.

[0025] The present invention provides a replaceable polyurethane seamless expansion joint device for longitudinal joints of bridges and an installation and replacement method thereof, which has the following beneficial effects: This invention designs the telescopic device as a split structure in which the pre-embedded foundation and the upper joint module can be detachably connected. This allows the old joint module to be lifted out as a whole by simply removing the connecting parts during maintenance and replacement. The original groove anchoring concrete, the pre-embedded base frame and the anchoring sleeve are all retained in their original positions for continued use. This avoids the destructive work of cutting and chiseling the groove concrete and re-re-planting the reinforcement in traditional maintenance, which greatly shortens the traffic closure time and reduces construction waste. Meanwhile, the polyurethane material poured on site flows into and solidifies through the through hole opened on the anchor pipe to form a through mechanical key structure, which changes the transmission of expansion load from relying on interface adhesion to a coordinated force transmission mode of mechanical interlocking, hole edge bearing and polyurethane shear, significantly reducing the risk of debonding failure. Furthermore, through the independent support plate set on the support base of the reinforcing part and the lip-shaped waterproof surface at its bottom, an elastic compression sealing structure independent of the elastic matrix is ​​formed in the waterproof layer cavity, which not only ensures the vertical load-bearing capacity of the cross joint area, but also avoids the problem of the waterproof layer being torn due to the deformation or aging of the main body. This invention effectively solves the technical problems in the prior art, such as the need to destroy the original structure for maintenance, easy detachment of force transmission, lack of independent waterproof structure, and inability to quickly replace without chiseling. It achieves a synergistic improvement in the service performance and maintainability of the longitudinal joint expansion device for widened bridges. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of the present invention.

[0027] Figure 1 This is an exploded view of a replaceable polyurethane seamless expansion joint device for widening the longitudinal joint of a bridge. Figure 2 This is a schematic diagram of a partial cross-section of a replaceable polyurethane seamless expansion joint device for widening the longitudinal joint of a bridge. Figure 3 This is a partial cross-sectional schematic diagram of the installation of a replaceable polyurethane seamless expansion joint device for widening the longitudinal joint of a bridge. Figure 4 This is a diagram of the initial state of the expansion joint; Figure 5 This is a diagram showing the compression state of an expansion joint; Figure 6 This is a diagram showing the tensile state of an expansion joint; Figure 7 This is a partial schematic diagram of a lip-shaped waterproof seal structure; Figure 8 This is a schematic diagram of the split structure of the upper seam module; Parts and component numbers in the diagram: 100 - Beam body, 111 - Groove; 210 - First embedded bottom pipe, 220 - Second embedded bottom pipe, 231 - Anchor sleeve; 310-Anchor pipe, 311-Through hole, 321-Double threaded bolt, 322-Threaded pad block, 323-Elastic assembled plug, 331-Reinforcing rib plate, 332-Reinforcing anchor ring, 333-Support seat, 334-Waterproof layer cavity, 340-Predetermined spacing, 350-Deformation gap; 410-Support plate, 411-Support core plate, 412-Elastic layer, 413-Lip-shaped waterproof surface, 420-Baffle, 421-Anchor; 500 - Polyurethane elastic matrix. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, the element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Where there is no conflict, embodiments of the present invention and the various features thereof can be combined with each other, all of which are within the scope of protection of the present invention.

[0029] Example 1 Please see Figure 1 , Figure 2 and Figure 3The present invention provides a replaceable polyurethane seamless expansion joint for the longitudinal joint of a bridge widening project, which is installed in the longitudinal joint groove 111 between the old and new beams 100 of the bridge widening project, and includes a pre-embedded base frame fixedly installed in the groove 111. The first telescopic part and the second telescopic part are respectively arranged above the pre-embedded base frame, and a predetermined distance of 340 is left between them; Please see Figure 4 , Figure 5 and Figure 6 A support portion is provided between the first telescopic portion and the second telescopic portion, and deformation gaps of 350 are respectively left between the two sides of the support portion and the first telescopic portion and the second telescopic portion. And a polyurethane elastic matrix 500, which fills the groove 111 and covers the support, the first telescopic part and the second telescopic part, and a portion of the polyurethane material fills the interior of the first telescopic part and the second telescopic part and cures to form a mechanical locking structure. The first telescopic part and the second telescopic part are detachably connected to the pre-embedded base frame through detachable connectors. The first telescopic part, the second telescopic part, the support part and the polyurethane elastic matrix 500 together constitute the upper sewing module to realize the overall replacement of the upper sewing module.

[0030] Please see Figure 4 , Figure 5 and Figure 6 The replaceable polyurethane seamless expansion joint of the bridge longitudinal joint described in this embodiment mainly adapts to and coordinates the expansion and contraction deformation of the bridge during operation through the following methods: When the width of the longitudinal joint changes due to factors such as changes in ambient temperature, concrete shrinkage and creep, differential settlement between old and new bridges, or vehicle loads, the beams 100 on both sides of the longitudinal joint experience relative displacement. This displacement is first transmitted to the entire device through the embedded base frame fixedly installed in the slot 111. Since the first and second expansion joints are positioned opposite each other above the embedded base frame with a predetermined distance 340 between them, the predetermined distance 340 between the first and second expansion joints decreases when the two beams 100 move closer together; and increases when the two beams 100 move further apart.

[0031] During the aforementioned deformation process, the support portion located between the first and second telescopic portions provides sufficient deformation space for both portions through deformation gaps 350 on both sides. Specifically, when the longitudinal joint is compressed (the two beams 100 on both sides move closer together), the first and second telescopic portions move towards the support portion, and the aforementioned deformation gaps 350 gradually decrease, thereby preventing rigid collisions between the first or second telescopic portion and the support portion; when the longitudinal joint is stretched (the two beams 100 on both sides move away from each other), the first and second telescopic portions move away from the support portion, and the aforementioned deformation gaps 350 gradually increase.

[0032] Please see Figure 4 Meanwhile, the polyurethane elastic matrix 500, filled within the slot 111 and covering the support, first telescopic part, and second telescopic part, directly absorbs and adapts to changes in the longitudinal seam width due to its excellent elastic tensile, compressive, and shear deformation capabilities. More importantly, some polyurethane material fills the interior of the first and second telescopic parts and cures to form a mechanical interlocking structure, creating a strong mechanical interlocking connection between the polyurethane elastic matrix 500 and the first and second telescopic parts, rather than relying solely on interfacial adhesion. When the embedded base frame transfers the telescopic load to the first and second telescopic parts through detachable connectors, the load is first transferred through the first and second telescopic parts to the mechanical interlocking structure cured inside them, and then evenly transferred to the polyurethane elastic matrix 500 through this mechanical interlocking structure, causing the polyurethane elastic matrix 500 to undergo corresponding elastic deformation, thereby achieving the seamless telescopic function of the longitudinal seam.

[0033] When vehicles pass through the longitudinal joint area, the top surface of the polyurethane elastic matrix 500 is flush with the bridge deck pavement, eliminating the need for vehicles to cross exposed joint openings or rigid steps. Simultaneously, the elastic deformation of the polyurethane material itself effectively buffers localized impacts and vibrations caused by vehicle loads. The support structure further enhances the vertical load-bearing capacity of the joint area, preventing excessive vertical deformation of the polyurethane elastic matrix 500 under vehicle loads.

[0034] Please see Figure 2In this embodiment, the first and second telescopic sections are detachably connected to the embedded base frame via detachable connectors. The first and second telescopic sections, the support section, and the polyurethane elastic matrix 500 together constitute the upper expansion joint module. When the expansion joint needs replacement, only the detachable connectors need to be removed, allowing the entire upper expansion joint module to be pulled out of the slot 111, while the original embedded base frame within the slot 111 is completely preserved. This structural feature completely changes the destructive work mode of traditional seamless expansion joint maintenance, which requires cutting and chiseling away the concrete of the slot 111 and re-reinforcing bars. It significantly shortens traffic closure time, reduces construction waste, lowers maintenance costs, and reduces disturbance to the existing bridge beam structure 100.

[0035] In this embodiment, a portion of the polyurethane material is filled into the interior of the first and second expansion joints and cured to form a mechanical key structure. This structure allows the transmission of expansion loads to no longer primarily rely on the interfacial adhesion between the polyurethane and the metal or concrete, but rather on a synergistic force transmission mode achieved through the combined effects of mechanical interlocking, bore edge bearing, polyurethane shearing, and pipe wall constraint. This significantly reduces the risk of expansion failure due to interfacial debonding and greatly improves the reliability and durability of the expansion device under repeated expansion and contraction conditions.

[0036] This embodiment distributes functions such as expansion and contraction, load transmission, waterproofing, and post-maintenance to different structural levels: the polyurethane elastic matrix 500 is responsible for expansion and contraction and smooth driving; the mechanical locking structure inside the first and second expansion sections is responsible for reliable load transmission; the support section is responsible for the vertical load-bearing capacity of the joint area; and the detachable connectors enable quick replacement later. Each functional module is independent yet works in concert, avoiding the drawbacks of traditional solutions where functional coupling within the same system leads to the complete failure of the entire system due to a single point of failure.

[0037] In this embodiment, a predetermined distance 340 is left between the first telescopic part and the second telescopic part, and deformation gaps 350 are left between the two sides of the support part and the first and second telescopic parts respectively. The above-mentioned gap design ensures that when the longitudinal seam undergoes large expansion and contraction deformation, there will be no rigid collision between the metal components, thereby protecting the polyurethane elastic matrix 500 from local stress concentration and tearing damage, and improving the overall service life of the telescopic device.

[0038] This embodiment effectively solves the technical problems in the prior art, such as the need to destroy 100% of the original beam structure for maintenance, easy detachment of force transmission, and inability to quickly replace, by permanently retaining the pre-embedded foundation and the modular and replaceable upper joint body, as well as the force transmission structure formed by the inflow of polyurethane material to form mechanical locking keys. It achieves a synergistic improvement in the service performance and maintainability of the longitudinal joint expansion joint device for widened bridges.

[0039] Further, please see Figure 1 and Figure 2 The pre-embedded base frame includes a first pre-embedded base pipe 210 and a second pre-embedded base pipe 220 symmetrically arranged on both sides of the longitudinal seam; the first telescopic part and the second telescopic part are respectively arranged above the first pre-embedded base pipe 210 and the second pre-embedded base pipe 220, and the inner sides of the first telescopic part and the second telescopic part are respectively provided with reinforcing parts; the support part is arranged on the reinforcing parts of the first telescopic part and the second telescopic part.

[0040] Further, please see Figure 1 , Figure 2 and Figure 3 An anchoring sleeve 231 is fixedly provided on the pre-embedded base frame. The first telescopic part and the second telescopic part each include an anchoring pipe 310. The anchoring pipe 310 is detachably connected to the anchoring sleeve 231 by a double threaded bolt 321.

[0041] Furthermore, both the pre-embedded base frame and the anchor pipe 310 are configured as through-type tubular components, with several through holes 311 opened on the pipe wall along the axial and / or circumferential directions. The through holes 311 are connected to the inner cavity of the pipe and are used to allow the poured polyurethane material to flow in and solidify to form a mechanical locking key structure.

[0042] Furthermore, the anchoring sleeve 231 is fixedly mounted on the pre-embedded base frame; the lower part of the double-threaded bolt 321 is threadedly connected to the anchoring sleeve 231; a threaded shim 322 is provided between the bottom of the anchoring pipe 310 and the upper end of the anchoring sleeve 231; an elastically assembled plug 323 is provided at the upper end of the anchoring pipe 310, and the upper part of the double-threaded bolt 321 passes through the threaded shim 322 and is threadedly connected to the elastically assembled plug 323.

[0043] Furthermore, the reinforcing part includes a plurality of reinforcing ribs 331 spaced along the longitudinal seam direction on the inner side wall of the embedded base frame, and reinforcing anchor rings 332 fixedly disposed on the reinforcing ribs 331; the supporting part is provided with a support seat 333 for placing the supporting part through the plurality of reinforcing ribs 331; the support seats 333 of the first telescopic part and the second telescopic part are arranged facing each other to form a waterproof layer receiving cavity 334 between them; the reinforcing anchor ring 332 is U-shaped, and the open end of the reinforcing anchor ring 332 faces one end of the waterproof layer receiving cavity 334.

[0044] Furthermore, the support includes a support plate 410 and a baffle 420 disposed above the support plate 410, the support plate 410 being placed on the support base 333; the baffle 420 being fixed to the top of the support plate 410 by an anchor sleeve.

[0045] Furthermore, the support plate 410 includes a rigid support core plate 411 and an elastic layer 412 disposed outside the rigid support core plate 411; the bottom of the support plate 410 is provided with a lip-shaped waterproof surface 413, which forms an elastic pressing contact with the support surface of the support base 333 after installation.

[0046] Specifically, the polyurethane elastic matrix 500 serves as the upper elastic body of the expansion joint, adapting to changes in the longitudinal joint width of the widened bridge through its own elastic tension, compression, and shear deformation. When vehicles pass, the polyurethane elastic matrix 500 directly bears the wheel load and reduces the impact, vibration, and noise of vehicles passing through the longitudinal joint area through the elastic deformation of the polyurethane material. Please see Figure 1 and Figure 2 The flexible, assembled plug 323 is used to seal the anchoring hole of the anchoring pipe 310 above the double-threaded bolt 321, and provides a positioning mark and disassembly channel for the double-threaded bolt 321 during later replacement. Its upper flexible sealing part can prevent the vehicle tire from directly contacting the metal connector, and its lower internal threaded connection part is threaded to the double-threaded bolt 321, which can improve the stability of the plug after installation. Please see Figure 1 and Figure 4 As the main force-transmitting component between the polyurethane elastic matrix 500 and the embedded base frame, the anchor pipe 310 is used to transmit the force from the slot 111 of the beam 100 to the anchor pipe 310 when the longitudinal joint of the widened bridge is stretched or compressed due to temperature changes, concrete shrinkage and creep, or relative deformation of the old and new beams 100. The force is transmitted through the embedded base frame, anchor sleeve 231, double threaded bolt 321, and threaded shim 322 to the anchor pipe 310, and then from the anchor pipe 310 to the polyurethane elastic matrix 500. After the polyurethane material enters the through hole 311 and the inner cavity of the rectangular tube, it forms a through mechanical key structure, which transforms the force mode from simple interface adhesion to a synergistic force transmission mode of mechanical interlocking, hole edge bearing, polyurethane shear, and rectangular tube constraint. Please see Figure 2 and Figure 7 The baffle 420 serves as a pouring baffle and sealing cover. It is used to prevent polyurethane material from flowing downward into the bottom waterproof layer cavity 334 formed by the pre-embedded base frame opposing support seat 333 during the pouring of polyurethane elastic matrix 500, thereby ensuring the activity space and waterproof sealing position of the support plate 410. Please see Figure 6 and Figure 7The anchor 421 serves as a connecting component, pressing the baffle 420 onto the upper surface of the support plate 410 via bolts; on the other hand, it positions the support plate 410 by cooperating with the polyurethane elastic matrix 500 through its upper positioning structure, so that the support plate 410 remains in the predetermined position of the bottom waterproof layer cavity 334 during the stretching and compression of the telescopic device. Please see Figure 1 and Figure 7 The rigid support core plate 411 of the support plate 410 is used to improve the vertical bearing capacity of the expansion joint area, and its outer elastic covering layer, i.e., the elastic layer 412, is used to reduce vibration and impact when vehicles pass by. The lip-shaped waterproof surface 413 provided at the bottom of the support plate 410 forms a tight contact with the support surface of the bottom waterproof layer receiving cavity 334 after installation, which can prevent rainwater from the bridge deck from seeping down along the longitudinal joint into the lower part of the groove 111 of the beam 100; Please see Figure 1 , Figure 3 and Figure 4 The embedded base frame serves as the fundamental anchoring component between the slot 111 of the beam 100 and the expansion joint, simultaneously achieving anchorage connection with the concrete of the slot 111 of the beam 100 and detachable connection with the replaceable joint module. Support seats 333 extending longitudinally along the longitudinal joint are provided on the opposite inner sides of the embedded base frame. Two support seats 333 are arranged facing each other to form a bottom waterproof layer receiving cavity 334, used to accommodate, support, and protect the support plate 410. Concrete flow holes provided on the embedded base frame reduce pouring dead angles and voids, improving the bonding quality between the anchoring concrete of the slot 111 and the embedded base frame; rectangular positioning holes on the embedded base frame are used to install and restrict the rotation of the anchor sleeve 231. Please see Figure 1 and Figure 2 The threaded shim block 322 is used to adjust the height of the anchor tube 310 in the polyurethane elastic matrix 500, so that the line of action of the longitudinal tensile or compressive load is closer to the centroid of the anchor tube 310, reducing the eccentric additional bending moment and local tensile-shear stress concentration. The threaded shim block 322 is also provided with a lifting threaded hole for connecting lifting bolts during later replacement, thereby realizing the overall removal of the old seam module.

[0047] Please see Figure 1 and Figure 3 The anchor sleeve 231 is used to provide a threaded connection base for the double-threaded bolt 321. Its rectangular outer section mates with the rectangular positioning hole on the pre-embedded base frame, which can restrict the rotation of the anchor sleeve 231 during the installation, disassembly and stress of the double-threaded bolt 321, thereby improving the consistency of the connection position and the reliability of installation.

[0048] Please see Figure 1 , Figure 2 and Figure 8The double-threaded bolt 321 is used to detachably connect the anchoring pipe 310, the threaded shim 322, the anchoring sleeve 231, and the embedded base frame. Its lower thread is used to connect with the anchoring sleeve 231, and its upper thread is used to install the flexible assembly plug 323. During later replacement, after removing the flexible assembly plug 323, the double-threaded bolt 321 can be removed through the anchoring hole, thereby severing the main mechanical connection between the replaceable seam module and the embedded base frame.

[0049] Further, please see Figure 4 and Figure 5 Polyurethane elastic matrix 500 is poured on site into the cavity of longitudinal groove 111. After curing, it covers and wraps the upper part of anchor pipe 310, baffle 420, anchor 421 and the surrounding area of ​​elastic assembled plug 323, so that the above components and polyurethane elastic matrix 500 form an integral structure. The flexible assembly plug 323 is mounted on the upper external thread of the double-threaded bolt 321 via its lower internal thread connection. The upper flexible sealing part of the flexible assembly plug 323 is located on the surface of the polyurethane elastic matrix 500, used to seal the anchor hole, and serves as a positioning mark for disassembly of the double-threaded bolt 321 during later replacement; Anchor pipe 310 is installed on the upper surface of threaded shim block 322 and threadedly connected to anchor sleeve 231 by double threaded bolt 321, thus being installed on the upper part of the pre-embedded base frame. When polyurethane elastic matrix 500 is poured, polyurethane material enters the through hole 311 of anchor pipe 310 and the inner cavity of rectangular tube, and forms a mechanical interlocking connection after curing; The baffle 420 is disposed between the anchor 421 and the support plate 410, and is pressed and fixed to the upper surface of the support plate 410 by the anchor 421. Anchor 421 is connected to support plate 410 through connection holes on baffle 420. The upper positioning structure of anchor 421 is embedded in polyurethane elastic matrix 500 to limit the displacement of support plate 410 during longitudinal joint expansion and contraction deformation. The support plate 410 is placed in the bottom waterproof layer receiving cavity 334 formed by the pre-embedded base frame opposing support seats 333, and spans across both sides of the longitudinal joint. The lip-shaped waterproof surface 413 at the bottom of the support plate 410 is pressed into contact with the support surface of the bottom waterproof layer receiving cavity 334, forming a continuous waterproof sealing structure; The embedded base frame is placed in the installation slot 111 of the longitudinal joint of the beam 100 and connected to the embedded steel bars of the slot 111 of the beam 100 by welding, anchoring or other fixing methods. Concrete flow holes are provided on the embedded base frame so that the anchoring concrete of the slot 111 can enter the local cavity or pore area of ​​the embedded base frame when it is poured, thereby improving the overall anchoring performance between the embedded base frame and the concrete of the slot 111. A threaded shim block 322 is positioned between the upper surface of the anchor sleeve 231 and the anchor pipe 310, and its height is used to adjust the spatial position of the anchor pipe 310 within the polyurethane elastic matrix 500. The threaded shim block 322 has threaded holes for connecting lifting bolts during replacement work. Anchor sleeve 231 is inserted into the rectangular positioning hole of the embedded base frame and fixed to the embedded base frame by spot welding, welding or other fixing methods. The rectangular outer section of anchor sleeve 231 mates with the rectangular positioning hole of the embedded base frame to restrict relative rotation of anchor sleeve 231; The lower thread of the double-threaded bolt 321 is threadedly connected to the anchor sleeve 231, and the upper thread is threadedly connected to the flexible assembly plug 323. The double-threaded bolt 321 is also used to detachably connect the anchor pipe 310, the threaded shim block 322 and the embedded base frame, and to form a mechanical anchoring connection that can be disengaged for later replacement. To facilitate future overall replacement, a non-permanent anchoring interface is preferentially formed between the polyurethane elastic matrix 500 and the concrete sidewall of the groove 111. This non-permanent anchoring interface can be a natural contact interface, a weakly bonded interface, an isolation layer interface, or a peelable interface. The main anchoring force transmission of the expansion joint is achieved by the anchoring pipe 310, the double-threaded bolt 321, the anchoring sleeve 231, and the pre-embedded base frame.

[0050] Please see Figure 4 , Figure 5 and Figure 6 When the width of the longitudinal joint changes due to temperature variations, concrete shrinkage and creep, relative deformation of the old and new beams 100, or vehicle loads, the beams 100 on both sides of the longitudinal joint cause relative displacement of the corresponding embedded base frame. The embedded base frame transmits the force to the anchoring pipe 310 through the anchoring sleeve 231, double-threaded bolts 321, and threaded shims 322. The anchoring pipe 310 then transmits the force to the polyurethane elastic matrix 500 through its through hole 311 and the polyurethane mechanical locking key structure cured in its inner cavity, causing the polyurethane elastic matrix 500 to undergo tensile, compressive, or shear deformation, thereby achieving the seamless expansion and contraction function of the longitudinal joint.

[0051] During the aforementioned deformation process, the support plate 410 is located within the bottom waterproof layer receiving cavity 334 formed by the pre-embedded base frame and is held in a predetermined position by the limiting action of the anchor 421. The elastic covering layer 412 and the lip-shaped waterproof surface 413 of the support plate 410 undergo adaptive elastic compression with structural deformation, maintaining the cross-joint support and bottom waterproof sealing function.

[0052] Example 2 Please see Figures 1-8This invention provides an installation and replacement method for a replaceable polyurethane seamless expansion joint device for longitudinal joints of bridges widening, applicable to the replaceable polyurethane seamless expansion joint device for longitudinal joints of bridges widening as described in any one of Embodiments 1, including an installation construction method and a replacement construction method. The installation and construction method includes the following steps: Step 1: Place the pre-embedded base frame into the cleaned longitudinal groove 111 and fix it in place; place temporary filling material in the longitudinal gap. Clean the longitudinal joint groove 111 of the bridge, removing sand, dust, loose concrete, and debris. The anchoring sleeve 231 is pre-fixed in the rectangular positioning hole of the embedded base frame at the factory or on-site. After placing and adjusting the embedded base frame to the designed position, it is welded or anchored to the pre-embedded reinforcing bars in the groove 111 of the beam body. Temporary filling material or templates are then placed in the longitudinal joint gap to prevent the anchoring concrete in the groove 111 from flowing into the longitudinal joint gap during pouring.

[0053] Step 2: Pour the anchoring concrete at the 111 groove, cure it to the design strength, and then clean and level it. Pour anchoring concrete into slot 111, filling the area surrounding the embedded base frame and allowing it to flow through the concrete flow holes on the embedded base frame into the corresponding gaps or cavities. Ensure the top surface of the anchoring concrete in slot 111 is flush with or reaches the design elevation of the embedded base frame, and cure it to the design strength. After curing, grind, clean, and level the installation surface.

[0054] Step 3: Place the support in the waterproof layer cavity 334, connect each anchor pipe 310 to the corresponding anchor sleeve 231 by double threaded bolts 321, and install the elastic assembly plug 323. Place the support plate 410 within the bottom waterproof layer receiving cavity 334 formed by the pre-embedded base frame opposing support seats 333, and adjust it to the middle of the longitudinal seam or the designed position. Then, place the baffle 420 above the support plate 410, and press and fix the baffle 420 to the upper surface of the support plate 410 using anchors 421 and connecting bolts. Next, place the threaded shim 322 above each anchor sleeve 231, place the anchor tube 310 on the threaded shim 322, and align the mounting holes of the anchor tube 310, the threaded shim 322, and the anchor sleeve 231. Then, use an Allen wrench or other tools to pass the double-threaded bolt 321 through the mounting hole of the anchor tube 310 and screw it into the anchor sleeve 231. Finally, install the elastic assembly plug 323 on the upper external thread of the double-threaded bolt 321.

[0055] Step 4: Pour polyurethane material into the cavity of slot 111, and after curing, form the polyurethane elastic matrix 500. Polyurethane material is poured into the longitudinal joint groove 111 cavity, filling it completely and extending into the through hole 311 of the anchor pipe 310 and the inner cavity of the rectangular tube. The top surface of the polyurethane elastic matrix 500 is controlled to be flush with or reach the design elevation of the bridge deck pavement. After the polyurethane material has cured and reached the designed service hardness, the polyurethane elastic matrix 500, anchor pipe 310, threaded shim block 322, and related connecting components form a replaceable joint module, which can then be opened to traffic or proceed to subsequent construction procedures.

[0056] Furthermore, the replacement construction method includes the following steps: Step A: Remove each of the elastic assembled plugs 323 and each of the double threaded bolts 321 to disconnect all mechanical connections between the upper seam module and the embedded base frame; Clean the surface of the telescopic device to be replaced to expose the location of the flexible assembly plug 323. Use an Allen wrench or other tools to remove the flexible assembly plug 323, exposing the disassembly channel of the double-threaded bolt 321. Then, remove the double-threaded bolt 321 through the disassembly channel, severing the main mechanical connection between the anchor pipe 310, the threaded shim block 322, and the anchor sleeve 231. Then, install the lifting bolt into the lifting threaded hole of the threaded shim block 322.

[0057] Step B: Connect the lifting bolts to the lifting thread holes of each of the threaded shims 322, and lift the old upper seam module as a whole using the lifting equipment; Lifting equipment is used, connected to lifting bolts via wire ropes, lifting tools, or other connectors. Since the double-threaded bolt 321 has been removed, the main mechanical connection between the replaceable joint module and the embedded base frame is released. Simultaneously, the polyurethane elastic matrix 500 and the concrete sidewall of the groove 111 form a non-permanent anchorage interface or a weak bond interface. After overcoming the residual adhesive force and frictional resistance between the replaceable joint module and the surrounding concrete, the lifting equipment can lift the polyurethane joint module to be replaced as a whole. During the replacement process, the original groove 111 anchoring concrete, the embedded base frame, and the anchoring sleeve 231 remain in their original positions.

[0058] Step C: Clean the remaining longitudinal groove 111, embedded base frame and anchor sleeve 231, install the new support and new anchor pipe 310, and tighten the new double threaded bolt 321 and elastic assembled plug 323. Clean the remaining longitudinal groove 111, embedded base frame, and anchor sleeve 231, and check their position and connection status. Place the new support plate 410 in the bottom waterproof layer receiving cavity 334 formed by the opposing support seat 333 of the embedded base frame, and adjust it to the designed position. Then, use connecting bolts to install the anchor 421 and baffle 420 on the upper surface of the support plate 410. Next, place the threaded shim 322 on top of each anchor sleeve 231, place the new anchor tube 310 on the threaded shim 322, and use an Allen wrench to screw the new double-threaded bolt 321 into the anchor sleeve 231 through the mounting hole of the anchor tube 310. Finally, install the new flexible assembly plug 323 on the upper external thread of the double-threaded bolt 321.

[0059] Step D: Re-pour the polyurethane material, and after curing, form a new polyurethane elastic matrix 500; Polyurethane material is re-poured into the cavity of slot 111, covering the anchor pipe 310 and entering the through hole 311 and the inner cavity of the rectangular tube of the anchor pipe 310. The top surface of the polyurethane elastic matrix 500 is controlled to be flush with the bridge deck pavement layer or reach the design elevation. After the polyurethane material has cured and reached the designed service hardness, the new replaceable polyurethane seamless expansion joint is installed and the road can be opened to traffic.

[0060] Furthermore, after the old upper seam module is lifted out as a whole, the anchoring concrete of the original slot 111, the embedded base frame and the anchoring sleeve 231 are all retained in their original positions for the installation of the new upper seam module.

[0061] This invention forms a detachable anchoring connection system through a pre-embedded base frame, anchor sleeve 231, double-threaded bolt 321, threaded shim block 322, anchor pipe 310, and elastic assembled plug 323. When the expansion joint needs to be replaced, the elastic assembled plug 323 can be removed first, and then the double-threaded bolt 321 can be removed through the anchor hole, thus severing the main mechanical connection between the replaceable joint module and the pre-embedded base frame; subsequently, the lifting bolt is connected to the lifting threaded hole of the threaded shim block 322, and the old joint module containing the polyurethane elastic matrix 500 and the anchor pipe 310 can be lifted out as a whole.

[0062] Therefore, during the replacement process, the original groove 111 anchoring concrete, the embedded base frame and the anchoring sleeve 231 can be retained, reducing the steps of cutting, chiseling and re-anchoring the groove 111 concrete in traditional maintenance, which is conducive to reducing the amount of maintenance work, shortening the traffic closure time and reducing demolition waste.

[0063] This invention uses an anchor tube 310 as the main force transmission component between the polyurethane elastic matrix 500 and the embedded base frame. The polyurethane material poured on-site can enter the through hole 311 of the anchor tube 310 and the inner cavity of the rectangular tube, forming a through-type mechanical locking structure after curing. This structure ensures that the force during longitudinal tensile and compressive deformation no longer primarily relies on the interfacial adhesion between the polyurethane and the metal or concrete, but is instead transmitted through mechanical interlocking, hole edge bearing, polyurethane shear, and rectangular tube constraint. This improves the reliability of force transmission between the polyurethane elastic matrix 500 and the anchor component, reducing the risk of expansion and contraction failure due to interfacial debonding.

[0064] This invention adjusts the height of the anchor tube 310 within the polyurethane elastic matrix 500 using a threaded shim block 322, bringing the line of action of the longitudinal tensile or compressive load closer to the centroid of the anchor tube 310's cross-section. This structure reduces the eccentric additional bending moment generated when the anchor tube 310 is under stress, lowers the local tensile-shear stress concentration in the polyurethane elastic matrix 500 on both sides of the anchor block, helps suppress tearing and fatigue damage of the polyurethane material near the joint, and improves the durability of the expansion joint under repeated expansion and contraction conditions.

[0065] This invention forms a cross-joint support and bottom waterproof structure through a support plate 410, a bottom waterproof layer receiving cavity 334 formed by pre-embedded base frame opposing support seats 333, a baffle 420, and anchors 421. The support plate 410 is set in the bottom waterproof layer receiving cavity 334 and spans across both sides of the longitudinal joint. Its rigid support core plate 411 can improve the vertical support capacity of the longitudinal joint crossing area, and its external elastic covering layer, i.e., the elastic layer 412, can absorb the local impact and vibration under vehicle load. The baffle 420 can prevent polyurethane material from entering the bottom waterproof layer receiving cavity 334 during polyurethane pouring, ensuring the installation space and waterproof position of the support plate 410.

[0066] This invention provides a lip-shaped waterproof surface 413 at the lower part of the support plate 410. After installation, the lip-shaped waterproof surface 413 forms an elastic compression contact with the supporting surface of the bottom waterproof layer cavity 334, which can continuously maintain the contact pressure by utilizing the self-restoring force of the elastic material, thereby preventing rainwater from the bridge deck from seeping into the lower part of the beam body 100 groove 111 along the longitudinal joint. If multiple lip-shaped waterproof surfaces 413 are used, each lip-shaped waterproof surface 413 can form a multi-level water-blocking structure; even if one of the sealing contacts is affected by local construction deviations or impurities, the remaining lip-shaped waterproof surfaces 413 can still continue to play a water-blocking role, thereby improving the fault tolerance of the waterproof structure at the bottom of the longitudinal joint.

[0067] The embedded base frame of the present invention has support seats 333 extending along the longitudinal seam on the relatively inner side, and the two support seats 333 are arranged facing each other to form a bottom waterproof layer receiving cavity 334. This receiving cavity can play a role in installation positioning, edge limiting and external protection of the support plate 410, so that the support plate 410 is kept in a predetermined position during the deformation of the expansion device, reducing the possibility of the waterproof function being reduced due to displacement, overturning or exposure damage to the waterproof components.

[0068] The embedded base frame of this invention is provided with concrete flow holes. During the pouring of the anchoring concrete at the groove 111, the concrete can enter the gaps or inner cavity area of ​​the embedded base frame through the concrete flow holes, allowing the embedded base frame to form a more complete wrapping and bonding with the surrounding groove 111 concrete. This structure can reduce pouring dead corners, voids, and air trapping around the embedded base frame, improve the compactness of the anchoring concrete at the groove 111, and enhance the anchoring stability of the embedded base frame.

[0069] The anchor sleeve 231 of this invention has a non-circular outer cross section and mates with the rectangular positioning hole on the pre-embedded base frame. This structure can restrict the rotation of the anchor sleeve 231 relative to the pre-embedded base frame during the installation, disassembly and stress of the double threaded bolt 321, improve the stability of the threaded connection position and the accuracy of repeated installation, and facilitate the reinstallation of the double threaded bolt 321 and the anchor pipe 310 during later replacement.

[0070] The elastically assembled plug 323 of the present invention includes an upper elastic sealing part and a lower internally threaded connection part. The lower internally threaded connection part is connected to the upper external thread of the double-threaded bolt 321, so that the plug is not only constrained by the friction of the anchor hole sidewall, but also by the threaded connection, thereby improving the installation stability of the plug under vehicle load and vibration. The upper elastic sealing part is located in the vehicle surface area, which can prevent the vehicle tire from directly contacting the metal connector, and serves as a positioning mark for disassembling the double-threaded bolt 321 during later maintenance.

[0071] This invention utilizes a polyurethane elastic matrix 500 to form a seamless elastic body for the bridge deck. The top surface of the polyurethane elastic matrix 500 is flush with the bridge deck pavement layer, eliminating the need for vehicles to cross exposed joints or rigid steps when passing through the longitudinal joint area. Simultaneously, the elastic deformation of the polyurethane material itself can buffer localized impacts and vibrations caused by vehicle loads. Therefore, this invention can adapt to the stretching, compression, and localized deformation of the longitudinal joints in widened bridges while improving the continuity of the bridge deck and the ride comfort at the longitudinal joints, reducing driving discomfort and noise caused by exposed joints, localized misalignments, or impacts from rigid components.

[0072] The installation and replacement method of this invention mainly includes the following steps during new installation: fixing the pre-embedded base frame, pouring anchoring concrete for the groove 111, installing the support plate 410, installing the anchor pipe 310 and double-threaded bolts 321, and installing the polyurethane elastic matrix 500. During replacement, the main steps include removing the elastic prefabricated plug 323, removing the double-threaded bolts 321, connecting the lifting bolts, removing the old joint module as a whole, reinstalling the new component, and re-pouring the polyurethane elastic matrix 500. This method ensures that the installation and replacement processes correspond to the device structure, reducing on-site temporary processing and complex dismantling operations, and improving the controllability of construction organization.

[0073] From an engineering application perspective, this invention, through a combination of a detachable anchorage connection system, a mechanically locked polyurethane force transmission system, a bottom-waterproof and shock-absorbing cross-joint support system, and an overall replacement method, provides a structural solution to simultaneously address the issues of seamless traffic flow, anchorage force transmission, waterproofing and shock absorption, and subsequent maintenance at the longitudinal joints of widened bridges. Compared to repair methods that require breaking through the concrete of slot 111 or resetting the anchorage foundation, this invention retains the original anchorage concrete of slot 111 and the pre-embedded base frame during replacement, reducing the disturbance to the existing beam 100 bridge structure during maintenance and minimizing the impact on traffic and the surrounding environment during the maintenance process.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A replaceable polyurethane seamless expansion joint device for longitudinal joints of a bridge widening project, disposed within the longitudinal joint groove (111) between the old and new beams (100) of the bridge widening project, characterized in that, include: An embedded base frame is fixedly installed in the slot (111); The first telescopic part and the second telescopic part are arranged opposite to each other above the pre-embedded base frame, and a predetermined distance (340) is left between them. A support portion is disposed between the first telescopic portion and the second telescopic portion, and deformation gaps (350) are respectively left between the support portion and the first telescopic portion and the second telescopic portion on both sides. And a polyurethane elastic matrix (500) is filled in the groove (111) and covers the support, the first telescopic part and the second telescopic part, and a portion of the polyurethane material is filled in the interior of the first telescopic part and the second telescopic part and cured to form a mechanical locking structure. The first telescopic part and the second telescopic part are detachably connected to the pre-embedded base frame through a detachable connector. The first telescopic part, the second telescopic part, the support part and the polyurethane elastic matrix (500) together constitute the upper sewing module to realize the overall replacement of the upper sewing module.

2. The replaceable polyurethane seamless expansion joint device for longitudinal joints of bridges according to claim 1, characterized in that, The embedded base frame includes a first embedded base pipe (210) and a second embedded base pipe (220) symmetrically arranged on both sides of the longitudinal joint. The first telescopic part and the second telescopic part are respectively disposed above the first pre-embedded bottom pipe (210) and the second pre-embedded bottom pipe (220), and the inner sides of the first telescopic part and the second telescopic part are respectively provided with reinforcing parts; The support portion is disposed on the reinforcing portion of the first telescopic portion and the second telescopic portion.

3. The replaceable polyurethane seamless expansion joint device for longitudinal joints of bridge widening as described in claim 1, characterized in that, An anchor sleeve (231) is fixedly provided on the pre-embedded base frame. The first telescopic part and the second telescopic part respectively include an anchor pipe (310). The anchor pipe (310) is detachably connected to the anchor sleeve (231) by a double threaded bolt (321).

4. The replaceable polyurethane seamless expansion joint device for longitudinal joints of bridge widening as described in claim 3, characterized in that, The embedded base frame and anchor pipe (310) are both configured as through tubular components, with several through holes (311) opened on the pipe wall along the axial and / or circumferential directions. The through holes (311) are connected to the inner cavity of the pipe and are used to allow the poured polyurethane material to flow in and solidify to form a mechanical locking structure.

5. The replaceable polyurethane seamless expansion joint device for longitudinal joints of bridge widening as described in claim 3, characterized in that, The anchor sleeve (231) is fixedly installed on the pre-embedded base frame; The lower part of the double-threaded bolt (321) is threadedly connected to the anchor sleeve (231); A threaded pad (322) is provided between the bottom of the anchor pipe (310) and the upper end of the anchor sleeve (231). The upper end of the anchor pipe (310) is provided with an elastic assembly plug (323), and the upper part of the double threaded bolt (321) passes through the threaded pad block (322) and is threadedly connected to the elastic assembly plug (323).

6. The replaceable polyurethane seamless expansion joint device for longitudinal joints of bridge widening as described in claim 2, characterized in that, The reinforcing part includes a plurality of reinforcing ribs (331) spaced apart on the inner side wall of the pre-embedded base frame along the longitudinal seam direction, and reinforcing anchor rings (332) fixedly disposed on the reinforcing ribs (331). The support part is provided with a support seat (333) for placing the support part by means of a plurality of reinforcing ribs (331). The support bases (333) of the first telescopic part and the second telescopic part are arranged facing each other to form a waterproof layer receiving cavity (334) between them.

7. The replaceable polyurethane seamless expansion joint device for longitudinal joints of bridge widening as described in claim 5, characterized in that, The support includes a support plate (410) and a baffle (420) disposed above the support plate (410), the support plate (410) being placed on the support base (333); The baffle (420) is fixed to the top of the support plate (410) by anchors (421).

8. The replaceable polyurethane seamless expansion joint device for longitudinal joints of bridge widening as described in claim 7, characterized in that, The support plate (410) includes a rigid support core plate (411) and an elastic layer (412) disposed outside the rigid support core plate (411). The bottom of the support plate (410) is provided with a lip-shaped waterproof surface (413), which forms an elastic pressing contact with the support surface of the support base (333) after installation.

9. A method for installing and replacing a replaceable polyurethane seamless expansion joint device for longitudinal joints of bridge widening projects, applicable to the replaceable polyurethane seamless expansion joint device for longitudinal joints of bridge widening projects as described in any one of claims 1 to 8, characterized in that... This includes installation and replacement methods; The installation and construction method includes the following steps: Step 1: Place the pre-embedded base frame into the cleaned longitudinal groove (111) and fix it, and place temporary filling material in the longitudinal gap; Step 2: Pour the anchoring concrete at the groove (111), and clean and level it after curing to the design strength; Step 3: Place the support in the waterproof layer cavity (334), connect each anchor pipe (310) to the corresponding anchor sleeve (231) with a double threaded bolt (321), and install the elastic assembly plug (323). Step 4: Pour polyurethane material into the cavity of the slot (111), and after curing, form the polyurethane elastic matrix (500). The replacement construction method includes the following steps: Step A: Remove each of the elastic assembled plugs (323) and remove each of the double threaded bolts (321) to disconnect all mechanical connections between the upper seam module and the embedded base frame; Step B: Connect the lifting bolts to the lifting thread holes of each of the threaded shims (322), and lift the old upper seam module as a whole using the lifting equipment; Step C: Clean the remaining longitudinal groove (111), embedded base frame and anchor sleeve (231), install the new support and new anchor pipe (310), and tighten the new double threaded bolt (321) and flexible assembled plug (323). Step D: Re-pour polyurethane material, which will cure to form a new polyurethane elastic matrix (500).

10. The method for installing and replacing the replaceable polyurethane seamless expansion joint device for longitudinal joints of bridges according to claim 9, characterized in that, After the old upper seam module is lifted out as a whole, the anchoring concrete of the original slot (111), the embedded base frame and the anchoring sleeve (231) are all retained in their original positions for the installation of the new upper seam module.

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