Prefabricated expansion joint assembly for bridge deck and method for disassembling the same

Abstract

The application discloses a prefabricated bridge deck slab expansion joint assembly and a dismounting method thereof. The assembly comprises waterproof rubber strips, main cover bodies and bridge deck slabs on both sides of the expansion joint. The end of the deck slab is inwardly recessed to form a convex part. The main cover bodies are placed on the convex parts on both sides of the expansion joint. The main cover bodies are slidably hung with two sliding covers. A steel plate and a water stop rod are embedded in each convex part. Each sliding cover covers the water stop rod on the same side. A spring is arranged between the two sliding covers. The waterproof rubber strips are sealingly fixed with the two sliding covers. The sliding cover top plate and the water stop rod are statically water-stopped under normal conditions. The water stop rod, the sliding cover and the spring are dynamically water-stopped when swelling and shrinking. The end face of the deck slab is provided with a reserved hole. The inner rod of the main cover body is detachably connected with the outer rod in the reserved hole. The key of the dismounting method is that the main cover body is hoisted, the sliding cover covers the water stop rod of the corresponding convex part, and then the outer rod in the reserved hole is connected with the corresponding inner rod. The assembly and the method can not only avoid underwater seepage of the bridge deck, but also make the dismounting process quick, convenient and efficient.

Description

Technical Field

[0001] This invention relates to the field of bridge deck expansion joint construction technology, specifically a prefabricated bridge deck expansion joint assembly and a method for assembling and disassembling the expansion joint assembly. Background Technology

[0002] The bridge consists of a series of piers cast at regular intervals, with a cap beam cast across the width of each pier. Each section of the bridge deck rests on the cap beam, and a surface layer of concrete is poured on top of each section. The rear end of one section and the front end of the next section rest on the same cap beam, and the gap between the two sections forms an expansion joint. The bridge has multiple expansion joints from front to back, relying on these joints to withstand thermal expansion and contraction. To prevent water from seeping through the expansion joints and corroding the concrete reinforcement of the piers and cap beams, waterproofing and seepage prevention components need to be installed at each expansion joint.

[0003] Existing expansion joint components include two channel steels that open to both sides and a centrally located waterproof strip. The left and right sides of the waterproof strip are respectively sealed and fixed to the webs of the left and right channel steels. The lengths of the waterproof strip and the channel steels match the width of the bridge deck.

[0004] The aforementioned expansion joint components objectively have a limited service life. Once the rubber ages, they are prone to leakage, so they need to be replaced periodically. However, the replacement process for existing expansion joint components is very cumbersome. Workers need to chisel open the concrete pavement layer on both sides of the expansion joint to expose the reinforcing mesh of the pavement layer. The reinforcing mesh is then cut from the old channel steel. Two new channel steels are then placed at the notches chiseled open on both sides of the bridge deck. Each new channel steel is then spot-welded to the reinforcing mesh of the pavement layer on the same side. Finally, concrete is poured into the notches to cover the exposed reinforcing mesh, and each new channel steel is anchored in the concrete poured on the same side.

[0005] Because the disassembly and assembly of the aforementioned expansion joint components requires each step of chiseling open the pavement layer, cutting the old channel steel and steel mesh, spot welding the new channel steel, and pouring concrete, the operation is cumbersome, labor-intensive, and costly. The construction process itself is inefficient, slow, and time-consuming. Even after completion, it is necessary to wait for the poured concrete to dry before traffic can resume, resulting in long road closures and significant traffic disruptions. Summary of the Invention

[0006] One technical problem that this invention aims to solve is to provide a prefabricated bridge deck expansion joint assembly that can both prevent underwater seepage from corroding the bridge pier reinforcement and enable the replacement process to be quick, convenient, and efficient with minimal impact on traffic.

[0007] One technical solution of the present invention is to provide a prefabricated bridge deck expansion joint assembly, which includes a longitudinal waterproof strip and two bridge deck sections located on both sides of the expansion joint, with a concrete pavement layer poured on the top surface of each bridge deck section.

[0008] The pavement layer of each bridge deck section is recessed at the end to form an outward protrusion at the end of the bridge deck section;

[0009] The expansion joint assembly also includes a longitudinal inverted U-shaped main cover, with the two side plates of the main cover resting on two outward protrusions on both sides of the expansion joint;

[0010] The main cover body is provided with two longitudinal inverted U-shaped sliding covers. The two ends of each sliding cover extend out of the two ends of the main cover body, and each sliding cover has barbs at both ends. Each sliding cover is suspended by the barbs at both ends of the main cover body top plate. The main cover body top plate and each sliding cover top plate are provided with guide rails and guide grooves for transverse sliding engagement.

[0011] A longitudinal steel plate is pre-embedded in the protruding part of each bridge deck section, and a longitudinal waterstop bar is sealed and welded to the steel plate; each sliding cover covers the waterstop bar on the same side and a U-shaped rubber sleeve is fitted between the sliding cover and the waterstop bar; multiple springs are provided between the two inner side plates of the two sliding covers; the two sides of the waterproof rubber strip are respectively sealed and fixed to the two inner side plates of the two sliding covers.

[0012] Under normal conditions, the top plate of the sliding cover and the water-stop rod press together to stop the water flow; when the water-stop rod expands due to heat, it pushes the corresponding sliding cover inward while the spring pushes the sliding cover outward, so that the inner side plate of the sliding cover and the water-stop rod press together to stop the water flow; when the water-stop rod contracts due to cold, it pushes the corresponding sliding cover outward while the spring pulls the sliding cover inward, so that the outer side plate of the sliding cover and the water-stop rod press together to stop the water flow.

[0013] Each pavement layer has multiple pre-drilled holes on its end face. Both sides of the main cover have multiple transverse inner rods. Each inner rod is detachably connected to a transverse outer rod, and each outer rod extends into the corresponding pre-drilled hole.

[0014] Another technical problem that this invention aims to solve is to provide a method for disassembling and assembling prefabricated bridge deck expansion joint components that can both prevent underwater seepage from corroding the bridge pier reinforcement and make the disassembly and replacement process quick, convenient, efficient, and with minimal impact on traffic.

[0015] Another technical solution of the present invention is to provide a method for disassembling and assembling a prefabricated bridge deck expansion joint assembly, the steps of which include:

[0016] When pouring the bridge deck, a steel plate and a waterstop rod are pre-embedded in each outward protrusion of each section of the bridge deck; then, when pouring the pavement layer on the bridge deck, a row of sleeves is pre-embedded at the end of each pavement layer to form reserved holes.

[0017] During initial installation, insert the outer rod into the pre-drilled hole at the end of the pavement layer; use a crane to place the two side plates of the main cover body on the outer protrusions of the two bridge panels on both sides of the expansion joint, so that each sliding cover covers the waterstop rod of the corresponding outer protrusion; then pull out a section of the outer rod in the pre-drilled hole and connect it with the corresponding inner rod; at this point, the component installation is complete.

[0018] When replacing components, separate each outer rod from its corresponding inner rod, then lift away the main cover and sliding cover of the old expansion joint component, and then use the same steps as the initial installation to lift the main cover and sliding cover of the new expansion joint component.

[0019] Compared with existing technologies, the above-mentioned prefabricated bridge deck expansion joint components and their assembly / disassembly methods have the following advantages and technical effects.

[0020] This component offers excellent waterproofing and seepage prevention. Under normal conditions, the sliding cover top plate, the water-stop rod, and the rubber sleeve between the sliding cover top plate and the water-stop rod are tightly pressed together, achieving static water sealing. However, during thermal expansion and contraction, the sliding cover top plate and the water-stop rod will slide relative to each other, causing the static seal to fail. At this time, the spring will function to transform the sliding cover and the water-stop rod into a dynamic seal. For example, during thermal expansion, the outward protrusion at the end of the bridge deck moves towards the centerline of the expansion joint, causing the water-stop rod to push the sliding cover inward, while the spring pushes the sliding cover outward. This causes the inner side plate of the sliding cover, the water-stop rod, and the rubber sleeve between the inner side plate of the sliding cover and the water-stop rod to be tightly pressed together, achieving dynamic water sealing. During thermal contraction, the outward protrusion at the end of the bridge deck moves in the opposite direction, causing the water-stop rod to push the sliding cover outward. The cover, while the spring pulls the cover inward, causing the outer plate of the cover, the water-stop rod, and the rubber sleeve between the outer plate of the cover and the water-stop rod to squeeze together, achieving dynamic water stoppage. In summary, the cover, spring, and water-stop rod work together to provide excellent waterproofing under various seasonal temperature conditions, always keeping water outside the two covers. The two covers are also sealed and fixed with a waterproof strip, thus completely cutting off the path of water seeping downward along the expansion joint. Water in the middle of the bridge width is discharged to both sides of the bridge along the waterproof strip and discharged at both ends of the waterproof strip, that is, in the cantilevered part on both sides of the bridge deck. This protects the cap beams and piers below the main body of the bridge deck and prevents the steel bars of the cap beams and piers below the expansion joint from being corroded by water.

[0021] Moreover, the disassembly and assembly process of this application is quick and convenient. Once the preliminary work is completed, namely, pre-embedding the waterstop rod and treating the reserved holes during the initial pouring of the bridge, subsequent disassembly and replacement can be done once and for all without concrete work. That is, during subsequent disassembly and replacement, it is only necessary to hoist the main cover and sliding cover into place as a whole, cover the corresponding waterstop rod, and then connect the corresponding inner rod and outer rod. The disassembly and replacement process does not involve chiseling old concrete, welding, or pouring new concrete, which greatly increases efficiency and completely realizes concrete-free operation. Compared with the cumbersome disassembly and replacement steps of the existing technology, this application is highly efficient and labor-saving, reduces labor intensity, saves labor costs, and significantly shortens the construction period. Moreover, since there is no concrete construction, there is no need to wait for the concrete to dry and harden, and the road can be opened to traffic immediately after completion, with short road occupation time and minimal impact on traffic.

[0022] Furthermore, when vehicles cross the bridge, they press down on the main cover, causing it to bounce upwards due to the reaction force of the bridge surface. However, this application uses external rods that are inserted into the pre-drilled holes and connected internal rods to fix the main cover in place, effectively preventing the main cover from bouncing upwards when vehicles press down on it. Moreover, locking the main cover prevents it from being stolen, thus objectively creating an anti-theft effect.

[0023] Preferably, both the inner and outer rods are provided with external threads, and the inner and outer rods are screwed together through a sleeve with internal threads; the inner and outer rods can be quickly connected or disassembled by screwing, which is convenient to operate; and the connection structure of the above-mentioned anti-theft and anti-jump device is itself quite ingenious. The outer rod is pre-inserted into the reserved hole, which does not interfere with the hoisting and lowering of the main cover. After being hoisted into place, the inner rod can be quickly connected to achieve the locking of the height of the main cover.

[0024] As a further preferred option, each side plate of the main cover is provided with multiple through holes. The inner rod of each side plate of the main cover passes through the corresponding through hole and is then welded to the outer side plate of the same side cover. In this way, the inner rod can serve two purposes: it can connect to the outer rod, preventing theft and jumping, and it can also share part of the weight of the slide cover during the lifting process, preventing the slide cover from being fully loaded on the hooks at both ends during the lifting process, making the lifting process more stable.

[0025] As a further preferred option, each sleeve is fitted with an elastic conical sleeve, which achieves axial positioning of the sleeve when it is squeezed into the gap between the sleeve and the corresponding through hole.

[0026] Accordingly, before lifting, the lateral position of the waterstop rod is measured first, and then the sleeve is inserted and pulled along the through hole to make the lateral position of the corresponding sliding cover match the lateral position of the waterstop rod on the same side. Then, the elastic conical sleeve is squeezed into the gap between the sleeve and the corresponding through hole to lock the lateral position of the sliding cover, ensuring that the sliding cover just covers the corresponding waterstop rod when the main cover is lowered in the center.

[0027] This design limits the lateral position of the sliding sleeve, positioning it directly above the waterstop rod. This ensures that during hoisting, both sliding covers can be placed over the corresponding two waterstop rods at once, facilitating the hoisting process and ensuring the subsequent water-stopping effect. Moreover, the aforementioned inner and outer rod structure objectively achieves three functions in one: first, it prevents jumping and theft; second, it shares the weight of the sliding cover during hoisting, reducing the burden on the end hooks; and third, it locks the lateral position of the sliding cover, ensuring that it accurately covers the waterstop rod.

[0028] As a further preferred option, the front end of the barb is provided with a downward protrusion, and the end of the top plate of the main cover is provided with a transverse groove. The downward protrusion of the barb at each end of the sliding cover slides into the corresponding groove at the end of the top plate of the main cover. In this way, it can be combined with each inner rod, guide rail, and guide groove to jointly strengthen the axial limit of the sliding cover and ensure smooth lifting.

[0029] As an alternative, each sliding cover top plate is recessed to form multiple guide grooves, and the corresponding guide rails are fixed to the lower surface of the main cover top plate; in this way, the guiding effect of each sliding cover is more ideal, ensuring that the sliding cover can smoothly follow the thermal expansion and contraction of the water stop rod.

[0030] As an enhancement, two pedestrian walkways are provided on the left and right sides of the bridge, each consisting of a regular section and a transition section spaced apart; each side of each bridge deck has a cantilever section, and each cantilever section has an inner stone block and an outer stone block; each end of the inner stone block has a stepped notch; each end of the main cover and sliding cover of each expansion joint assembly extends into the lower opening of the two stepped notches of two adjacent inner stones on the same side, and the upper opening of the two stepped notches together supports a pad beam, which, together with the ends of the corresponding two outer stones, supports a section of the pedestrian walkway transition section; the regular section of the pedestrian walkway is supported in the middle of the inner and outer stone blocks.

[0031] Accordingly, lift the two sidewalk transition sections at both ends of the expansion joint, remove the corresponding two pad beams, and then lower the main cover and sliding cover so that each end of the main cover and sliding cover extends into the lower opening of the two step gaps of the two adjacent inner stone blocks on the same side. Then, place the pad beams back on the upper opening of the two step gaps, and then place the lifted sidewalk transition sections back on the pad beams and the ends of the corresponding two outer stone blocks.

[0032] The design concept of the aforementioned enhancement scheme is that the main body of the bridge deck is supported by the cap beam, while the cantilevered portions on both sides of the bridge deck extend beyond the cap beam. However, to ensure complete waterproofing and seepage prevention of the cap beam, the expansion joint component of this application not only covers the main body in the middle of the bridge deck but also extends to the cantilevered portions of the bridge deck on both sides. This leads to an installation problem: the main cover and sliding cover of the component may interfere with and obstruct the sidewalks on both sides of the bridge deck. The aforementioned enhancement scheme, however, incorporates a liftable sidewalk transition section and pad beam, successfully resolving the problem of interference and obstruction between the ends of the main cover, sliding cover, and other components and the sidewalks during the installation of the expansion joint component, while ensuring complete waterproofing and seepage prevention of the cap beam and piers. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the prefabricated bridge deck expansion joint assembly of the present invention assembled on a bridge.

[0034] Figure 2 yes Figure 1 A structural diagram showing the structure after removing part of the outer stone slabs and sidewalk.

[0035] Figure 3 yes Figure 2 A structural diagram showing the structure after all the flagstones and sidewalks have been removed.

[0036] Figure 4 This is a front view structural schematic diagram of the prefabricated bridge deck expansion joint assembly of the present invention.

[0037] Figure 5 This is a structural schematic diagram of the prefabricated bridge deck expansion joint assembly of the present invention.

[0038] Figure 6 This is a cross-sectional view of the prefabricated bridge deck expansion joint assembly of the present invention along the axis of an inner rod.

[0039] Figure 7 This is a structural schematic diagram of the prefabricated bridge deck expansion joint assembly of the present invention during hoisting.

[0040] Figure 8 This is a schematic diagram of the structure of the main cover and sliding cover of the prefabricated bridge deck expansion joint assembly of the present invention after disassembly.

[0041] Figure 9 This is a schematic diagram of the main cover of the prefabricated bridge deck expansion joint assembly of the present invention.

[0042] Figure 10 yes Figure 6 A magnified structural diagram of part A in the middle.

[0043] The diagram shows: 1. Waterproof rubber strip; 2. Bridge deck; 2.1. Outward protrusion; 2.2. Cantilever; 3. Pavement layer; 4. Main cover; 5. Sliding cover; 6. Hook; 6.1. Lower protrusion; 7. Groove; 8. Guide rail; 9. Guide groove; 10. Steel plate; 11. Waterstop rod; 12. Rubber sleeve; 13. Spring; 14. Reserved hole; 15. Inner rod; 16. Outer rod; 17. Sleeve; 18. Through hole; 19. Elastic conical sleeve; 20. Normal section; 21. Transition section; 22. Inner stone slab; 23. Outer stone slab; 24. Cap beam; 25. Step notch; 26. Pad beam. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0045] like Figures 1-10 As shown, the prefabricated bridge deck expansion joint assembly of the present invention includes a longitudinally extending waterproof strip 1 and two bridge deck sections 2 located on both sides of the expansion joint. A concrete pavement layer 3 is poured on the top surface of each bridge deck section 2. The ends of the pavement layer 3 of each bridge deck section 2 are recessed to form an outward protrusion 2.1 at the end of the bridge deck section 2.

[0046] First, let's discuss a directional concept. The longitudinal direction refers to the length direction of the expansion joint, which is also the width direction of the bridge; while the transverse direction refers to the width direction of the expansion joint, which is also the length direction of the bridge, and can also be understood as the direction of the bridge's expansion and contraction.

[0047] The expansion joint assembly also includes a longitudinally extending inverted U-shaped main cover 4, with the two side plates of the main cover 4 resting on the two outward protrusions 2.1 of the two bridge deck sections 2 on both sides of the expansion joint.

[0048] The main cover 4 has two longitudinally extending inverted U-shaped sliding covers 5. Each sliding cover 5 has two ends extending out of the main cover 4, and each sliding cover 5 has a barb 6 welded to its two ends. Each sliding cover 5 is suspended from the top plate of the main cover 4 by the barbs 6 at both ends. Specifically, the front end of the barb 6 has a lower protrusion 6.1, and the end of the top plate of the main cover 4 has a transverse groove 7. The lower protrusion 6.1 of the barb 6 at each end of the sliding cover 5 slides in the corresponding groove 7 at the end of the top plate of the main cover 4. The groove 7 is wider than the lower protrusion 6.1, which facilitates the sliding cover 5 to slide in the transverse direction of the bridge's expansion and contraction.

[0049] The top plate of the main cover 4 and the top plate of each sliding cover 5 are provided with guide rails 8 and guide grooves 9 for lateral sliding engagement; in this embodiment, each top plate of the sliding cover 5 is recessed to form multiple guide grooves 9, and the corresponding guide rails 8 are fixed to the lower surface of the top plate of the main cover 4. Of course, it is also possible that the lower surface of the top plate of the main cover 4 is provided with guide grooves and the guide rails are welded to the top plate of the sliding cover 5.

[0050] A longitudinal steel plate 10 is pre-embedded on the upper surface of the protruding part 2.1 of each bridge deck section 2. A longitudinal waterstop rod 11 is sealed and welded to the steel plate 10. Each sliding cover 5 covers the waterstop rod 11 on the same side, and a U-shaped rubber sleeve 12 is fitted between the sliding cover 5 and the waterstop rod 11. Multiple springs 13 are provided between the two inner side plates of the two sliding covers 5. The two ends of each spring 13 are welded and fixed to the inner side plates of the two sliding covers 5 respectively. The two sides of the waterproof rubber strip 1 are also sealed and fixed to the two inner side plates of the two sliding covers 5 respectively. If the sides of the waterproof rubber strip 1 are made into a dovetail shape, it is inserted into the dovetail groove of the two inner side plates of the sliding cover 5, and then it is hot-pressed and hot-melted to seal and stop water.

[0051] Under normal conditions, the top plate of the sliding cover 5 and the water-stop rod 11 press together with the rubber sleeve 12 located between them to stop water flow. When the water-stop rod 11 expands inward to correspond to the sliding cover 5, while the spring 13 pushes the sliding cover 5 outward, so that the inner side plate of the water-stop rod 11 and the sliding cover 5 press together with the rubber sleeve 12 located between them to stop water flow. When the water-stop rod 11 contracts in cold, the water-stop rod 11 pushes outward to correspond to the sliding cover 5, while the spring 13 pulls the sliding cover 5 inward, so that the outer side plate of the water-stop rod 11 and the sliding cover 5 press together with the rubber sleeve 12 located between them to stop water flow.

[0052] Each pavement layer 3 has multiple pre-drilled holes 14 on its end face. When the concrete for the pavement layer 3 is poured, a sleeve is pre-embedded, and the pre-drilled hole 14 is formed after it hardens. Both sides of the main cover 4 have multiple transverse inner rods 15. Each inner rod 15 is detachably connected to a transverse outer rod 16, and each outer rod 16 extends into a corresponding pre-drilled hole 14. The detachable connection is preferably a screw connection, meaning both the inner rod 15 and the outer rod 16 have external threads, and they are screwed together via a sleeve 17 with internal threads.

[0053] The aforementioned inner rod 15 can be directly welded to the outer surface of the two side plates of the main cover 4. Alternatively, multiple through holes 18 can be provided on each side plate of the main cover 4, and the inner rod 15 of each side plate of the main cover 4 can pass through the corresponding through hole 18 of the side plate and be welded to the outer side plate of the same side slide cover 5; for example, the inner rod 15 that passes through the through hole 18 of the right side plate of the main cover 4 is welded to the outer side plate of the right side slide cover 5.

[0054] Each sleeve 17 is fitted with an elastic conical sleeve 19. When the elastic conical sleeve 19 is squeezed into the gap between the sleeve 17 and the corresponding through hole 18, the sleeve 17, the inner rod 15 and the corresponding sliding cover 5 are axially limited.

[0055] Two pedestrian walkways are provided on the left and right sides of the bridge. Each pedestrian walkway consists of a regular section 20 and a transition section 21 spaced apart. Each side of each bridge deck 2 has a cantilever section 2.2, and each cantilever section 2.2 has an inner stone slab 22 and an outer stone slab 23; that is, the left cantilever section 2.2 has an inner stone slab 22 and an outer stone slab 23, and the right cantilever section 2.2 also has an inner stone slab 22 and an outer stone slab 23, with each stone slab resting on the corresponding cantilever section 2.2. Each end of each inner stone slab 22 has a step notch 25.

[0056] Each end of the main cover 4 and sliding cover 5 of each expansion joint assembly extends into the lower opening of the two step notches 25 of the two adjacent inner stone blocks 22 on the same side. For example, the left end of the main cover 4 and sliding cover 5 extends into the lower opening of the step notches 25 of the two adjacent inner stone blocks 22 on the left side of the bridge. The upper opening of the two adjacent step notches 25 is supported by a pad beam 26. The pad beam 26 and the ends of the corresponding two outer stone blocks 23 are supported by a section of pedestrian transition section 21. The normal section 20 of the pedestrian walkway is supported in the middle section of the inner stone block 22 and the outer stone block 23, that is, the normal section that is not at the end.

[0057] like Figures 1-10 As shown, the method for disassembling and assembling the prefabricated bridge deck expansion joint assembly of the present invention includes the following steps.

[0058] When pouring the bridge deck 2, a steel plate 10 and a waterstop rod 11 are pre-embedded in each outward protrusion 2.1 of each section of the bridge deck 2; then, when pouring the pavement layer 3 on the bridge deck 2, a row of sleeves is pre-embedded at the end of each pavement layer 3 to form reserved holes 14; the above are the preliminary procedures, the purpose of which is to fix the waterstop rod 11 and form the reserved holes 14. After the preliminary work is completed, whether it is the initial installation of components or the later replacement of components, concrete-free construction can be achieved.

[0059] During initial installation, insert the outer rod 16 into the reserved hole 14 at the end of the pavement layer 3; use a crane to place the two side plates of the main cover body 4 on the two protruding parts 2.1 of the two bridge deck panels 2 on both sides of the expansion joint, so that the left and right sliding covers 5 cover the water-stop rods 11 of the corresponding protruding parts 2.1; then pull out a section of the outer rod 16 in the reserved hole 14 and connect it with the corresponding inner rod 15; at this time, the initial installation of the component is completed.

[0060] When replacing the components, separate each outer rod 16 from the corresponding inner rod 15, then lift away the main cover 4 and sliding cover 5 of the old expansion joint component. Then, use the same steps as the initial installation to lift the main cover 4 and sliding cover 5 of the new expansion joint component, and reconnect each inner rod 15 and outer rod 16.

[0061] Before lifting, first measure the lateral position of the waterstop rod 11, then insert and pull the sleeve 17 along the through hole 18 so that the lateral position of the corresponding sliding cover 5 matches the lateral position of the waterstop rod 11 on the same side. Then squeeze the elastic conical sleeve 19 into the gap between the sleeve 17 and the corresponding through hole 18 to lock the lateral position of the sliding cover 5, ensuring that the sliding cover 5 just covers the corresponding waterstop rod 11 when the main cover body 4 is lowered in the center.

[0062] As an improvement, the replacement steps for the ends of the expansion joint assembly are as follows: lift up the two sidewalk transition sections 21 at both ends of the expansion joint and move the corresponding two pad beams 26. Then lower the main cover 4 and the sliding cover 5 so that each end of the main cover 4 and the sliding cover 5 extends into the lower opening of the two step notches 25 of the two adjacent inner stone blocks 22 on the same side. Then, place the pad beams 26 back on the upper opening of the two step notches 25. Finally, place the lifted sidewalk transition section 21 back on the pad beams 26 and the ends of the corresponding two outer stone blocks 23.

Claims

1. A prefabricated bridge deck expansion joint assembly, comprising a longitudinal waterproof strip and two bridge deck sections located on both sides of the expansion joint, each bridge deck section having a concrete pavement layer poured on its top surface; Its features are: The pavement layer of each bridge deck section is recessed at the end to form an outward protrusion at the end of the bridge deck section; The expansion joint assembly also includes a longitudinal inverted U-shaped main cover, with the two side plates of the main cover resting on two outward protrusions on both sides of the expansion joint; The main cover body is provided with two longitudinal inverted U-shaped sliding covers. The two ends of each sliding cover extend out of the two ends of the main cover body, and each sliding cover has barbs at both ends. Each sliding cover is suspended by the barbs at both ends of the main cover body top plate. The main cover body top plate and each sliding cover top plate are provided with guide rails and guide grooves for transverse sliding engagement. A longitudinal steel plate is pre-embedded in the protruding part of each bridge deck section, and a longitudinal waterstop bar is sealed and welded to the steel plate; each sliding cover covers the waterstop bar on the same side and a U-shaped rubber sleeve is fitted between the sliding cover and the waterstop bar; multiple springs are provided between the two inner side plates of the two sliding covers; the two sides of the waterproof rubber strip are respectively sealed and fixed to the two inner side plates of the two sliding covers. Under normal conditions, the top plate of the sliding cover and the water-stop rod press together to stop the water flow; when the water-stop rod expands due to heat, it pushes the corresponding sliding cover inward while the spring pushes the sliding cover outward, so that the inner side plate of the sliding cover and the water-stop rod press together to stop the water flow; when the water-stop rod contracts due to cold, it pushes the corresponding sliding cover outward while the spring pulls the sliding cover inward, so that the outer side plate of the sliding cover and the water-stop rod press together to stop the water flow. Each pavement layer has multiple pre-drilled holes on its end face. Both sides of the main cover have multiple transverse inner rods. Each inner rod is detachably connected to a transverse outer rod, and each outer rod extends into the corresponding pre-drilled hole.

2. The prefabricated bridge deck expansion joint assembly according to claim 1, characterized in that: Both the inner and outer rods are threaded externally, and the inner and outer rods are screwed together through a sleeve with internal threads.

3. The prefabricated bridge deck expansion joint assembly according to claim 2, characterized in that: Each side plate of the main cover has multiple through holes. The inner rod of each side plate of the main cover passes through the corresponding through hole and is then welded to the outer side plate of the same side cover.

4. The prefabricated bridge deck expansion joint assembly according to claim 3, characterized in that: Each sleeve is fitted with an elastic tapered sleeve, which is used to limit the axial movement of the sleeve when it is squeezed into the gap between the sleeve and the corresponding through hole.

5. The prefabricated bridge deck expansion joint assembly according to claim 1, characterized in that: The front end of the barb has a downward protrusion, and the top plate of the main cover has a horizontal groove. The downward protrusion of the barb at each end of the sliding cover slides into the corresponding groove at the top plate of the main cover.

6. The prefabricated bridge deck expansion joint assembly according to claim 1, characterized in that: Each sliding cover top plate is recessed to form multiple guide grooves, and the corresponding guide rails are fixed to the lower surface of the main cover top plate.

7. The prefabricated bridge deck expansion joint assembly according to claim 1, characterized in that: The bridge has two pedestrian walkways on the left and right sides, each consisting of a regular section and a transition section with intervals; each section of the bridge deck has a cantilever on each side, and each cantilever has an inner stone and an outer stone; each end of the inner stone has a step notch. Each end of the main cover and sliding cover of each expansion joint assembly extends into the lower opening of the two step notches of two adjacent inner stones on the same side. The upper opening of the two step notches is supported by a pad beam, which, together with the ends of the corresponding two outer stones, supports a section of the pedestrian walkway transition; the normal section of the pedestrian walkway is supported in the middle section of the inner and outer stones.

8. The method for disassembling and assembling the prefabricated bridge deck expansion joint assembly according to claim 1, characterized in that: The steps include: When pouring the bridge deck, a steel plate and a waterstop rod are pre-embedded in each outward protrusion of each section of the bridge deck; then, when pouring the pavement layer on the bridge deck, a row of sleeves is pre-embedded at the end of each pavement layer to form reserved holes. During initial installation, insert the outer rod into the pre-drilled hole at the end of the pavement layer; use a crane to place the two side plates of the main cover body on the outer protrusions of the two bridge panels on both sides of the expansion joint, so that each sliding cover covers the waterstop rod of the corresponding outer protrusion; then pull out a section of the outer rod in the pre-drilled hole and connect it with the corresponding inner rod; at this point, the component installation is complete. When replacing components, separate each outer rod from its corresponding inner rod, then lift away the main cover and sliding cover of the old expansion joint component, and then use the same steps as the initial installation to lift the main cover and sliding cover of the new expansion joint component.

9. The method for disassembling and assembling the prefabricated bridge deck expansion joint assembly according to claim 8, characterized in that: Before lifting, first measure the lateral position of the waterstop rod, then insert and pull the sleeve along the through hole to make the lateral position of the corresponding sliding cover match the lateral position of the waterstop rod on the same side. Then squeeze the elastic conical sleeve into the gap between the sleeve and the corresponding through hole to lock the lateral position of the sliding cover, ensuring that the sliding cover just covers the corresponding waterstop rod when the main cover is lowered in the center.

10. The method for disassembling and assembling the prefabricated bridge deck expansion joint assembly according to claim 7, characterized in that: Lift the two sidewalk transition sections at both ends of the expansion joint and remove the corresponding two pad beams. Then lower the main cover and sliding cover so that each end of the main cover and sliding cover extends into the lower opening of the two step gaps of the two adjacent inner stone blocks on the same side. Then, place the pad beams back on the upper opening of the two step gaps and place the lifted sidewalk transition sections back on the pad beams and the ends of the corresponding two outer stone blocks.

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