Telescopic bridge approach slab structure adapting to fault movement and construction method

Abstract

The invention provides a telescopic bridge transition slab structure adapting to fault dislocation and a construction method, and relates to the technical field of bridge engineering.The telescopic bridge transition slab structure comprises a bridgehead transition slab arranged on a fill stratum between a bridge abutment and a roadbed, and the bridgehead transition slab is composed of an upper transition slab and a lower transition slab which are movably connected through a multi-stage energy dissipation type telescopic mechanism; the end, close to the bridge abutment, of the upper butt strap is connected with the bridge abutment through a first hinge anchoring mechanism, and the end, close to the roadbed, of the lower butt strap is connected with the roadbed through a second hinge anchoring mechanism. Through multi-stage energy consumption and hinge release, destructive damage of the structure can be avoided, the basic traffic capacity is maintained, that is, the synergistic effect of all subsystems jointly ensures that after large permanent dislocation is caused by an earthquake, the butt strap structure can still keep the basic form and the supporting function, and the safety of the butt strap structure is guaranteed. And a solid guarantee is provided for critical post-earthquake emergency traffic, and remarkable social and economic benefits are achieved.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, specifically to a retractable bridge approach slab structure and construction method adapted to fault displacement. Background Technology

[0002] Bridge approach slabs are key transitional components connecting rigid abutments and flexible roadbeds. In non-seismic zones, traditional monolithic reinforced concrete approach slabs or simple split approach slabs can basically meet the requirements.

[0003] However, bridges located in seismic zones, especially near active faults, face the extreme threat of large-scale, rapid fault displacement during earthquakes. This displacement can cause relative displacements of tens of centimeters or even meters between the abutment and the roadbed. Under such extreme conditions, traditional bridge approach slab structures reveal fatal flaws: monolithic approach slabs, due to their enormous rigidity and limited deformation capacity, can be quickly broken or crushed by the huge stress generated by fault displacement; while existing simple telescopic approach slabs have weak energy dissipation capacity, and their connection methods cannot release the rotational and bending moments generated by large displacements, making them prone to brittle failure at the connection points, and the overall design does not consider the coordinated work with the roadbed.

[0004] The fundamental problem with the aforementioned existing technologies is that their design concepts remain focused on solving "static" or "gradual" problems, and their structural flexibility and load-bearing capacity are insufficient to cope with extreme working conditions such as fault displacement, which involves "strong dynamics" and "large deformation".

[0005] Therefore, this invention proposes a retractable bridge approach slab structure and construction method that adapts to fault displacement. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention proposes a retractable bridge approach slab structure and construction method that adapts to fault displacement. Through multi-stage energy dissipation and hinged release, it avoids destructive damage to the structure itself and maintains basic traffic capacity.

[0007] The technical solution of this invention is implemented as follows: A retractable bridge approach slab structure adaptable to fault displacement includes a bridge approach slab disposed on the fill layer between the abutment and the roadbed. The bridge approach slab is composed of an upper approach slab and a lower approach slab that are movably connected by a multi-stage energy-dissipating telescopic mechanism. The end of the upper approach slab near the abutment is connected to the abutment through a first hinged anchoring mechanism, and the end of the lower approach slab near the roadbed is connected to the roadbed through a second hinged anchoring mechanism.

[0008] Preferably, the multi-stage energy-consuming telescopic mechanism includes multiple guide rods parallel to the bridge deck and perpendicular to the mating surfaces of the upper and lower approach plates; one end of each guide rod is fixed to the side wall of the upper or lower approach plate, and the other end passes through a corresponding pre-reserved groove on the side wall of another approach plate; each guide rod is fitted with a pressure spring in a pre-compressed state, and the pressure spring is supported between the opposite side walls of the two approach plates; the end of the guide rod passing through the pre-reserved groove is limited by a limiting nut.

[0009] Preferably, the multi-stage energy-consuming telescopic mechanism further includes at least one damper; the axis of the damper is parallel to the guide rod and located above or below it; the two ends of the damper are respectively provided with a first connecting lug and a second connecting lug; a third connecting lug and a fourth connecting lug are correspondingly provided on the opposite side walls of the upper plate and the lower plate; the damper passes through the first connecting lug and the third connecting lug, as well as the second connecting lug and the fourth connecting lug, in sequence by means of a pin to hinge the upper plate and the lower plate.

[0010] Preferably, at least two dampers are provided, and they are arranged symmetrically up and down or diagonally with the axis of the guide rod as the center of symmetry.

[0011] Preferably, the damper is any one of a metal yield damper, a friction damper, or a viscous damper.

[0012] Preferably, the first hinged anchoring mechanism includes a first embedded box pre-embedded on the side of the bridge abutment, a first hinge shaft disposed in the first embedded box, and a first hinge ear plate fixed to the end of the upper approach plate and sleeved on the first hinge shaft; the second hinged anchoring mechanism includes a second embedded box pre-embedded in the roadbed retaining structure, a second hinge shaft disposed in the second embedded box, and a second hinge ear plate fixed to the end of the lower approach plate and sleeved on the second hinge shaft.

[0013] Preferably, an elastic sealing strip is provided at the top of the gap between the upper and lower panels, and the gap is filled with highly elastic modified asphalt mastic.

[0014] Preferably, the bottom surface of the lower slab is provided with a plurality of downwardly protruding shear keys, which are embedded in the backfill layer; the bottom surface of the lower slab is also covered with a high-strength adhesive layer.

[0015] Preferably, the multi-stage energy-consuming telescopic mechanism is covered with a dust cover that can extend and retract along the guide rod axially; and the inner steel mesh of the upper and lower plates is provided with reinforcing steel bars in the connection area near the multi-stage energy-consuming telescopic mechanism.

[0016] A method for constructing a retractable bridge approach slab structure that adapts to fault displacement includes the following steps: constructing the bridge abutment and roadbed, and pre-embedding a first pre-embedded box and a second pre-embedded box; The fill layer after the bridge abutment is filled in layers by roller compaction and compacted to the design elevation; A high-strength bonding layer is laid on the surface of the fill layer, and then the lower slab is hoisted to embed the shear keys on it into the fill layer. The lower slab is then connected to the roadbed through the second hinged anchoring mechanism. The upper deck is hoisted and connected to the bridge abutment via the first hinged anchoring mechanism; Installing a multi-stage energy-consuming telescopic mechanism includes installing the fixed end of the guide rod in place, allowing the movable end of the guide rod to pass through the reserved groove of another plate, fitting a pre-compressed pressure spring, installing a damper, and tightening the limit nut. Install elastic sealing strips and inject highly elastic modified asphalt mastic; Finally, install the retractable dust cover.

[0017] Compared with the prior art, the present invention has the following advantages: By decomposing the traditional monolithic bridge abutment slab into upper and lower slabs and connecting them with a multi-stage energy-dissipating expansion joint, the structure is fundamentally endowed with the ability to cope with large displacement deformation. Simultaneously, by employing hinged anchorage mechanisms at both ends instead of rigid connections, boundary constraints are cleverly released, avoiding brittle failure modes such as slab breakage due to excessive bending moment or anchorage point pull-out. This shift in design philosophy allows the structure to move from "resisting" deformation to "guiding and adapting" deformation, forming the basis for achieving seismic toughness. Secondly, a multi-stage energy-dissipating expansion joint mechanism, consisting of guide rods, preloaded springs, and dampers, achieves graded defense from elastic deformation to plastic energy dissipation. The guide rods and springs provide initial stiffness and reset function, while the symmetrically arranged dampers act as "fuse," dissipating a large amount of seismic energy through yielding or friction, thus protecting the main structure. Furthermore, shear keys and high-strength adhesive layers ensure coordinated deformation of the approach slab and roadbed, preventing detachment; elastic sealing strips and dust covers guarantee the durability and sealing of the expansion joint mechanism; and internal reinforcing steel bars strengthen the load-bearing capacity of critical areas. In summary, through the synergistic effect of the aforementioned subsystems, the basic shape and supporting function of the slab structure are maintained even after a major permanent displacement caused by an earthquake, providing a solid guarantee for crucial post-earthquake emergency passage and demonstrating significant socio-economic benefits. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of a retractable bridge approach slab structure adapted to fault displacement according to the present invention. Figure 2 for Figure 1 An enlarged structural diagram at point A; Figure 3 This is a schematic diagram of the damper's structure; Figure 4 for Figure 1 Enlarged structural diagram at point B; Figure 5 for Figure 1 Enlarged structural diagram at point C; Attached diagram labels: 1-Abutment; 2-Approach slab; 201-Upper approach slab; 202-Lower approach slab; 3-Multi-stage energy-dissipating telescopic mechanism; 301-Guide rod; 302-Compression spring; 303-Damper; 304-Reserved groove; 305-Limit nut; 306-First connecting lug; 307-Second connecting lug; 308-Third connecting lug; 309-Fourth connecting lug; 310-Pin; 4-First hinged anchoring mechanism; 401-First embedded box; 402-First hinge shaft; 403-First hinge lug; 5-Second hinged anchoring mechanism; 501-Second embedded box; 502-Second hinge shaft; 503-Second hinge lug; 6-Elastic sealing strip; 7-Shear key; 8-High-strength adhesive layer; 9-Dust cover; 10-Reinforcing steel bar; 11-Backfill layer; 12-Subgrade. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," "third," and "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Example 1 This embodiment provides a retractable bridge approach slab structure that adapts to fault displacement, aiming to solve the problem that existing bridge approach slabs are prone to structural failure under large displacement conditions caused by earthquakes and fault displacement. Figure 1 As shown, the entire structure is set on the fill layer 11 between the bridge abutment 1 and the approach roadbed 12.

[0024] The core innovation of this structure lies in deconstructing the traditional monolithic bridge abutment slab into a flexible system capable of adapting to large deformations. Specifically, the bridge abutment slab 2 consists of an independent upper abutment slab 201 and a lower abutment slab 202, which are connected by a multi-stage energy-dissipating telescopic mechanism 3, rather than a rigid connection. This shift in design philosophy is the fundamental reason why this structure can cope with fault displacement.

[0025] To release boundary constraint stress and prevent the approach slab ends from breaking due to excessive bending moment during misalignment, this embodiment innovates the connection method at both ends. The end of the upper approach slab 201 closest to the abutment 1 is connected to the abutment 1 via a first hinged anchoring mechanism 4; correspondingly, the end of the lower approach slab 202 closest to the roadbed 12 is connected to the roadbed 12 via a second hinged anchoring mechanism 5. This hinged connection allows the approach slab to rotate to a certain extent vertically and laterally, fundamentally avoiding the stress concentration problem caused by rigid anchoring.

[0026] Detailed structure and effects of multi-stage energy-dissipating telescopic mechanism: like Figure 2As shown, the multi-stage energy-consuming telescopic mechanism 3 is the "intelligent joint" of this structure, which integrates multiple functions such as guiding, elastic reset, limiting and energy consumption.

[0027] The guiding and limiting subsystem consists of multiple guide rods 301 arranged parallel to the bridge deck direction (i.e., the driving direction). One end of each guide rod 301 is fixed to the side wall of the upper approach slab 201, while the other end passes through a corresponding pre-reserved slot 304 on the side wall of the lower approach slab 202. This pre-reserved slot 304 is not a circular hole, but rather an elongated or elliptical hole that allows the guide rod 301 to deflect within a certain angle, which is particularly important in the event of uneven displacement. The end of the guide rod 301 passing through the pre-reserved slot 304 is limited by a limiting nut 305, which prevents the upper and lower approach slabs from being excessively pulled apart and detached during an earthquake, serving as an important safety device.

[0028] Elastic reset subsystem: A compression spring 302 is fitted on each guide rod 301. This spring is pre-compressed during installation and is supported between the opposite side walls of the upper and lower approach slabs. Its beneficial effects are: on the one hand, it provides initial stiffness to the system, ensuring smooth daily driving; on the other hand, it provides restoring force after an earthquake, driving the approach slabs to reset as much as possible and reducing residual displacement.

[0029] Core energy dissipation subsystem: This mechanism also includes at least one damper 303. The axis of the damper 303 is parallel to the guide rod 301 and is arranged above or below it. The two ends of the damper 303 are hinged to the corresponding third connecting ear plates 308 and fourth connecting ear plates 309 on the side walls of the upper and lower plates via a first connecting ear plate 306, a second connecting ear plate 307, and a pin 310. This "ear plate-pin" hinged design ensures that the damper only bears axial tensile and compressive forces under any working condition, thereby maximizing its energy dissipation efficiency and avoiding premature damage due to bending moments. Preferably, two dampers 303 are provided and arranged symmetrically about the axis of the guide rod 301 to provide balanced energy dissipation capacity. The damper 303 can be any one of a metal yield damper (dissipating energy through metal plastic deformation), a friction damper, or a viscous damper, thus forming the last and most critical line of defense against seismic energy.

[0030] Sealing and durability design: The joint treatment between the upper plate 201 and the lower plate 202 is crucial. In this embodiment, a sealing groove with an inverted trapezoidal cross-section is pre-set at the top of the joint. During installation, an "Ω"-shaped rubber elastic sealing strip 6 is first embedded in the groove, using its own elasticity to compress and seal. Subsequently, highly elastic modified asphalt mastic is injected into the gap below the elastic sealing strip 6. To achieve injection, grouting holes and venting holes penetrating into the gap can be pre-embedded on the side of the upper plate 201 and / or the lower plate 202. During injection, grout is injected through the grouting holes, and the filling is complete when grout overflows from the venting holes. The advantage of this dual sealing system is that the elastic sealing strip is responsible for dynamic surface sealing, while the highly elastic modified asphalt mastic fills the internal gaps, jointly ensuring the waterproofness and durability of the joint during repeated expansion and contraction.

[0031] Design for collaborative work with the roadbed: To ensure that the lower slab 202 and the backfill layer 11 deform together during an earthquake and to prevent them from separating and forming "hollow areas", this embodiment adopts two measures: First, multiple downward-protruding shear keys 7 (such as steel sections) are provided on the bottom surface of the lower slab 202, which are embedded in the backfill layer 11 and play a mechanical fixing role similar to "tenons"; Second, a high-strength adhesive layer 8 (such as epoxy asphalt mortar) is laid between the bottom surface of the lower slab 202 and the backfill layer 11 to further enhance the integrity through chemical bonding.

[0032] Protection and local reinforcement: To protect the delicate multi-stage energy-consuming telescopic mechanism 3 from erosion by sand and rainwater, a dust cover 9 that can extend and retract along the axial direction of the guide rod 301 is installed on its exterior. At the same time, in the internal steel mesh of the upper plate 201 and the lower plate 202, additional reinforcing bars 10 are provided in the stress concentration area near the telescopic mechanism (reinforcing bars 10 are also provided in the reserved groove to provide rigidity to the reserved groove body, which, together with the limiting fit of the guide rod and the nut, significantly improves the fatigue resistance and impact resistance of this area.

[0033] Example 2 This embodiment provides a method for constructing the aforementioned retractable bridge approach slab structure that adapts to fault displacement. The process of this method ensures that all seismic structural measures can be accurately implemented.

[0034] S1: Foundation construction and pre-embedded components: First, construct the retaining structures of abutment 1 and roadbed 12 according to the design requirements. During this process, it is essential to accurately locate and pre-embed the first embedded box 401 of the first hinged anchoring mechanism 4 and the second embedded box 501 of the second hinged anchoring mechanism 5, ensuring that their axial elevation is consistent with the design. This is the foundation for subsequent successful hinge connection.

[0035] S2: Subgrade filling and compaction: High-quality fill material was used, and the moisture content and compaction degree were strictly controlled. The fill layer 11 after the bridge abutment was filled and compacted in layers to the design elevation. The compaction degree of the fill material directly affects the anchoring effect of the shear key 7 and the settlement performance of the overall structure.

[0036] S3: Installation and anchoring of the lower plate: On the compacted and leveled surface of the fill layer 11, a high-strength adhesive layer 8 is applied or laid. Then, using lifting equipment, the prefabricated lower slab 202 is hoisted, ensuring the shear keys 7 at its bottom are accurately pressed into the fill layer. Next, the second hinge shaft 502 is installed, connecting the second hinge lug 503 on the lower slab 202 to the second embedded box 501 pre-embedded in the roadbed, completing the hinge connection between the lower slab and the roadbed.

[0037] S4: Installation and anchoring of the upper slab: The upper deck 201 is hoisted and connected to the first hinge ear plate 403 at its end to the first embedded box 401 pre-embedded in the bridge abutment via the first hinge shaft 402, thus completing the hinge connection between the upper deck and the bridge abutment.

[0038] S5: Installation of multi-stage energy-consuming mechanisms: This step is crucial to the construction process and must be performed sequentially: Install the guide rod subsystem: Secure the fixed end of the guide rod 301 (e.g., by thread) to the pre-embedded sleeve of the upper plate 201, so that its movable end passes through the reserved groove 304 of the lower plate 202.

[0039] Install the elastic reset subsystem: Fit a pre-compressed pressure spring 302 onto the guide rod 301 (the spring can be pre-compressed before installation using a special tool).

[0040] Install the core energy dissipation subsystem: Position the damper 303, and use the pin 310 to pass through the lugs (308, 309) on the side wall of the slab and the lugs (306, 307) of the damper itself in sequence to complete the hinge connection.

[0041] Finally, tighten the limit nut 305 at the movable end of the guide rod 301 and adjust it to the design limit distance.

[0042] S6: Joint sealing system construction: This step is crucial for achieving durability: In the pre-reserved groove at the top of the joint between the upper and lower plates, accurately embed the “Ω”-shaped rubber elastic sealing strip 6 to ensure that it fits tightly against the groove wall.

[0043] High-elasticity modified asphalt mastic is injected into the joint through pre-embedded grouting holes using specialized equipment. The injection should be slow and continuous, and the pre-reserved vent holes should be observed. When uniform grout overflows from the holes, it indicates that the joint has been filled and compacted. At this point, the injection should be stopped and the grouting holes and vent holes should be sealed.

[0044] S7: Protective Installation: Finally, install the retractable dust cover 9 to enclose and protect the entire multi-stage energy-consuming telescopic mechanism 3, and conduct a final inspection and acceptance.

[0045] The above detailed construction methods ensure that the various seismic performance characteristics of the bridge approach slab structure are achieved, providing a reliable guarantee for the quality and safety of the project.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A retractable bridge approach slab structure adaptable to fault displacement, characterized in that: Includes a bridge approach plate (2) set on the fill layer (11) between the bridge abutment (1) and the roadbed (12). The bridge approach plate (2) is composed of an upper approach plate (201) and a lower approach plate (202) connected by a multi-stage energy-consuming telescopic mechanism (3). The upper approach plate (201) is connected to the bridge abutment (1) at one end near the bridge abutment (1) through a first hinged anchoring mechanism (4), and the lower approach plate (202) is connected to the roadbed (12) at one end near the roadbed (12) through a second hinged anchoring mechanism (5).

2. The retractable bridge approach slab structure adaptable to fault displacement according to claim 1, characterized in that: The multi-stage energy-consuming telescopic mechanism (3) includes multiple guide rods (301) parallel to the bridge deck and perpendicular to the mating end faces of the upper deck (201) and the lower deck (202); one end of the guide rod (301) is fixed inside the side wall of the upper deck (201) or the lower deck (202), and the other end passes through the corresponding reserved groove (304) on the side wall of another deck; each guide rod (301) is fitted with a pressure spring (302) in a pre-compressed state, and the pressure spring (302) is supported between the opposite side walls of the upper deck (201) and the lower deck (202); the guide rod (301) passes through the reserved groove (304) and is connected to a limit nut, so as to be limited by the limit nut (305).

3. The retractable bridge approach slab structure adaptable to fault displacement according to claim 2, characterized in that: The multi-stage energy-dissipating telescopic mechanism (3) further includes at least one damper (303); the axis of the damper (303) is parallel to the guide rod (301) and located above or below it; the two ends of the damper (303) are respectively provided with a first connecting ear plate (306) and a second connecting ear plate (307); the opposite side walls of the upper plate (201) and the lower plate (202) are respectively provided with a third connecting ear plate (308) and a fourth connecting ear plate (309); the damper (303) passes through the first connecting ear plate (306) and the third connecting ear plate (308), as well as the second connecting ear plate (307) and the fourth connecting ear plate (309) in sequence through a pin (310) to hinge the upper plate (201) and the lower plate (202).

4. The retractable bridge approach slab structure adaptable to fault displacement according to claim 3, characterized in that: At least two dampers (303) are provided, and are arranged symmetrically up and down or diagonally with the axis of the guide rod (301) as the center of symmetry.

5. A retractable bridge approach slab structure adaptable to fault displacement according to claim 4, characterized in that: The damper (303) is any one of a metal yield damper, a friction damper, or a viscous damper.

6. The retractable bridge approach slab structure adaptable to fault displacement according to claim 1, characterized in that: The first hinged anchoring mechanism (4) includes a first embedded box (401) pre-embedded on the side of the bridge abutment (1), a first hinge shaft (402) set in the first embedded box (401), and a first hinge ear plate (403) fixed to the end of the upper plate (201) and sleeved on the first hinge shaft (402); the second hinged anchoring mechanism (5) includes a second embedded box (501) pre-embedded in the retaining structure of the roadbed (12), a second hinge shaft (502) set in the second embedded box (501), and a second hinge ear plate (503) fixed to the end of the lower plate (202) and sleeved on the second hinge shaft (502).

7. A retractable bridge approach slab structure adaptable to fault displacement according to claim 1, characterized in that: An elastic sealing strip (6) is provided at the top of the gap between the upper plate (201) and the lower plate (202), and the gap is filled with highly elastic modified asphalt mastic.

8. A retractable bridge approach slab structure adaptable to fault displacement according to claim 1, characterized in that: The bottom surface of the lower slab (202) is provided with a plurality of downward protruding shear keys (7), which are embedded in the backfill layer (11); the bottom surface of the lower slab (202) is also covered with a high-strength adhesive layer (8).

9. A retractable bridge approach slab structure adaptable to fault displacement according to claim 2, characterized in that: The multi-stage energy-consuming telescopic mechanism (3) is covered with a dust cover (9) that can extend and retract along the guide rod (301); in the internal steel mesh of the upper plate (201) and the lower plate (202), there are reinforcing steel bars (10) in the connection area near the multi-stage energy-consuming telescopic mechanism (3).

10. A method for constructing a retractable bridge approach slab structure adaptable to fault displacement as described in any one of claims 1-9, characterized in that, Includes the following steps: Construct bridge abutments (1) and roadbed (12), and pre-embed the first pre-embedded box (401) and the second pre-embedded box (501); The fill layer (11) after the bridge abutment (1) is compacted in layers and compacted to the design elevation; A high-strength bonding layer (8) is laid on the surface of the fill layer (11), and then the lower plate (202) is hoisted so that the shear key (7) on it is embedded in the fill layer (11), and the lower plate (202) is connected to the roadbed (12) through the second hinged anchoring mechanism (5). The upper deck (201) is hoisted and connected to the bridge abutment (1) via the first hinged anchoring mechanism (4); Installing a multi-stage energy-consuming telescopic mechanism (3) includes installing the fixed end of the guide rod (301) into place, allowing the movable end of the guide rod (301) to pass through the reserved groove (304) of another plate, fitting a pre-compressed pressure spring (302), installing a damper (303), and tightening the limit nut (305). Install the elastic sealing strip (6) and inject high-elasticity modified asphalt mastic; Finally, install the retractable dust cover (9).

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