Bridge body structure based on steel box girder assembly connection

Abstract

The invention relates to the technical field of bridge body structures, and discloses a bridge body structure based on steel box girder assembly connection, which comprises a plurality of steel box girders arranged on a supporting structure in a crossing manner along a bridge site and fixed into a whole through welding; the top surfaces of the steel box girders are spliced into a flat bridge body surface, and paint is sprayed on the bridge body surface to form a bridge surface layer; the supporting structure comprises a middle buttress, the butt joint ends of the steel box girders are located above the middle buttress, and the butt joint sections of the adjacent steel box girders abut against the middle buttress from top to bottom. The bottom of the butt joint position is provided with a bottom positioning structure which can limit the transverse relative movement of the bottoms of the two butt joint ends and limit the transverse movement of the bottom of the butt joint position; the top of the butt joint position is provided with a top positioning structure which can limit the transverse relative movement of the tops of the two butt joint ends, in conclusion, the stability of the bridge body structure is enhanced through the steel box girder assembly connection and the arrangement of the positioning structure, and particularly, the bridge body structure is ensured to be more stable and safer under the action of transverse load.

Description

Technical Field

[0001] This invention patent relates to the technical field of bridge structures. Specifically, it relates to a bridge structure based on the assembly and connection of steel box girders. Background Art

[0002] The current construction technology of bridge steel box girders has diversity: including modular hoisting construction, that is, prefabricating, transporting, segmenting, and blocking the steel box girders, and assembling and hoisting them in segments on-site to reduce the impact on traffic and improve construction efficiency.

[0003] In the process of assembling multiple steel box girders into an integrated bridge body, the docking and fixing of the steel box girders are one of the most critical steps because it will directly affect the stability of the overall bridge structure and the quality and safety of the bridge.

[0004] In the prior art, the docking and fixing technology of steel box girders is relatively simple, resulting in structural instability due to the action of lateral forces during the assembly and connection of steel box girders. Especially under the action of lateral loads such as heavy loads or wind, the lateral movement of the docking ends of steel box girders will occur, thus making the overall bridge structure lack stability, not only reducing construction efficiency but also bringing potential quality and safety hazards to the bridge. Summary of the Invention

[0005] The purpose of the present invention is to provide a bridge structure based on the assembly and connection of steel box girders, aiming to solve the problem of insufficient stability of the bridge structure in the prior art.

[0006] The present invention is implemented as follows: it includes a bridge position support structure arranged and a plurality of steel box girders arranged on the support structure. The plurality of steel box girders are arranged across in sequence along the width direction of the bridge position and abut against the support structure from top to bottom; the steel box girder has a docking end facing the adjacent steel box girder, and the docking sections of the adjacent steel box girders are docked and fixed into one body by welding;

[0007] The top of the steel box girder has a flat top surface, and the top surfaces of the plurality of steel box girders form a flat bridge surface. A paint is sprayed on the bridge surface to form a bridge surface layer, and the bridge surface layer covers the bridge surface and forms an integral body with the bridge surface;

[0008] The support structure includes a middle pier arranged in the middle of the bridge position. The docking ends of the steel box girders are located above the middle pier, and the docking ends of the adjacent steel box girders are docked and fixed to form a docking section, and the docking section abuts against the middle pier from top to bottom;

[0009] The bottom of the docking position has a bottom positioning structure, which is embedded in the middle pier. The bottom positioning structure restricts the lateral relative movement of the bottoms of the two docking ends and restricts the lateral movement of the bottom of the docking position. The top of the docking position has a top positioning structure, which restricts the lateral relative movement of the tops of the two docking ends.

[0010] Further, along the lateral direction of the docking position, the bottom positioning structure and the top positioning structure are arranged in a staggered manner.

[0011] Further, the support structure includes two end piers respectively arranged at the ends of the bridge position. The middle pier is arranged between the two end piers, and the end of the steel box girder abuts against the end pier from top to bottom.

[0012] Further, the steel box girder includes a bridge deck and a bridge bottom plate arranged below the bridge deck. There is a beam inner cavity between the bridge deck and the bridge bottom plate, and an internal support structure is arranged in the beam inner cavity. The internal support structure connects the bridge deck and the bridge bottom plate into one body. The top of the bridge deck forms the top surface.

[0013] Further, the internal support structure includes a plurality of longitudinal support plates, and the plurality of longitudinal support plates extend along the length direction of the steel box girder. The bottom of the longitudinal support plate abuts against the bridge bottom plate, and the top of the longitudinal support plate abuts against the bridge deck.

[0014] Further, the internal support structure includes a plurality of transverse support plates, and the plurality of transverse support plates are arranged at intervals along the length direction of the steel box girder. The transverse support plates extend along the width direction of the steel box girder. The bottom of the transverse support plate abuts against the bridge bottom plate, the top of the transverse support plate abuts against the bridge deck, and the end of the transverse support plate abuts against the longitudinal support plate.

[0015] Further, the bottom positioning structure includes a positioning block protruding from the bottom of the bridge bottom plate and a positioning groove formed in the middle pier. The positioning blocks of adjacent bridge bottom plates elastically abut against each other, and the two positioning blocks are embedded in the positioning groove. The outer periphery of the positioning block abuts against the inner side wall of the positioning groove and is relatively fixed in the positioning groove.

[0016] Further, the positioning block has a docking surface facing the adjacent steel box girder. The middle of the docking surface is recessed inward to form a middle groove. The docking surface is recessed inward to form a plurality of ray grooves arranged in a radial shape. The plurality of ray grooves are arranged at intervals along the circumference of the middle groove. The inner end of the ray groove faces the middle groove and is separated from the middle groove. The outer end of the ray groove extends toward the outer periphery of the docking surface and is separated from the outer periphery of the docking surface.

[0017] The docking surfaces of the two adjacent positioning blocks face each other for docking. The middle grooves of the two docking surfaces communicate with each other, and the multiple ray grooves of the two docking surfaces communicate with each other respectively. A middle elastic body is embedded in the two middle grooves, and a ray elastic body is embedded in the ray grooves that communicate with each other. The middle elastic body and the ray elastic body are respectively in a compressed state.

[0018] Further, the top positioning structure includes an arc-shaped groove provided at one docking end and an arc-shaped block provided at the other docking end. The bottom of the arc-shaped groove is in an arc shape, and the outer periphery of the arc-shaped block is in an arc shape. The arc-shaped block is movably placed in the arc-shaped groove, and the outer periphery of the arc-shaped block abuts against the bottom of the arc-shaped groove. The arc-shaped block and the arc-shaped groove cooperate to limit the lateral relative movement of the tops of the two docking segments.

[0019] Further, a plurality of the arc-shaped blocks are provided on the other docking end. The plurality of arc-shaped blocks are arranged at intervals along the height direction of the docking end. There is an interval between adjacent arc-shaped blocks. The plurality of arc-shaped blocks are embedded in the arc-shaped groove, and the outer peripheries of the plurality of arc-shaped blocks all abut against the bottom of the arc-shaped groove;

[0020] The outer periphery of the arc-shaped block is covered with an elastic layer. The outer periphery of the elastic block abuts against the bottom of the arc-shaped groove and is in a compressed and deformed state.

[0021] Compared with the prior art, the bridge structure based on the assembly connection of steel box girders provided by the present invention has the following structural and functional advantages:

[0022] First, by arranging multiple steel box girders across in sequence, abutting against the support structure from top to bottom and being welded and fixed into one body, the stability of the bridge structure is enhanced, and the deformation caused by external loads and environmental factors is effectively resisted;

[0023] Second, the tops of the steel box girders are assembled into a flat bridge surface, and a paint is sprayed on the bridge surface to form an integrated bridge surface layer, which not only improves the durability of the bridge surface layer but also enhances the bearing capacity of the bridge structure;

[0024] Furthermore, the docking ends of the steel box girders are located above the middle piers in the support structure, further enhancing the longitudinal stability of the bridge structure. The bottom positioning structure at the docking position is embedded in the middle pier, restricting the lateral relative movement of the bottoms of the two docking ends, while the top positioning structure restricts the lateral relative movement at the top, ensuring the stability of the steel box girders at the docking position, preventing structural instability caused by lateral forces, and making the overall bridge structure more stable and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the front view schematic diagram of the bridge structure based on the assembly connection of steel box girders provided by the present invention;

[0026] Figure 2 It is a schematic structural diagram of the inner support structure provided by the present invention;

[0027] Figure 3 It is a schematic structural diagram of the bottom positioning structure provided by the present invention;

[0028] Figure 4 It is a schematic structural diagram of the docking surface of the steel box girder provided by the present invention;

[0029] Figure 5 It is a schematic structural diagram of another docking end provided by the present invention;

[0030] In the figure: bridge position 100, steel box girder 200, bridge surface layer 201, bridge bottom plate 202, bridge deck plate 203, beam inner cavity 204, longitudinal support plate 205, transverse support plate 206, middle pier 300, positioning block 301, positioning groove 302, middle groove 303, ray groove 304, docking end 400, arc surface groove 401, arc-shaped block 402, elastic layer 403, block interval 404. Specific embodiments

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The implementation of the present invention will be described in detail below with specific embodiments.

[0033] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] Refer to Figures 1-5 as shown, it is a preferred embodiment provided by the present invention.

[0035] The bridge structure based on the assembly connection of steel box girders includes a support structure arranged at the bridge position 100 and a plurality of steel box girders 200 arranged on the support structure. The plurality of steel box girders 200 are sequentially arranged across along the width direction of the bridge position 100 and abut against the support structure from top to bottom; the steel box girder 200 has a butt end 400 facing the adjacent steel box girder 200, and the butt sections of the adjacent steel box girders 200 are butted and fixed together by welding;

[0036] The top of the steel box girder 200 has a flat top surface, and the top surfaces of the plurality of steel box girders 200 are pieced together to form a flat bridge surface. A paint is sprayed on the bridge surface to form a bridge surface layer 201. The bridge surface layer 201 covers the bridge surface and forms an integral body with the bridge surface;

[0037] The support structure includes a middle pier 300 arranged in the middle of the bridge position 100. The butt end 400 of the steel box girder 200 is located above the middle pier 300. The butt ends 400 of the adjacent steel box girders 200 are butted and fixed to form a butt section, and the butt section abuts against the middle pier 300 from top to bottom;

[0038] The bottom of the butt position has a bottom positioning structure, and the bottom positioning structure is embedded in the middle pier 300. The bottom positioning structure restricts the lateral relative movement of the bottoms of the two butt ends 400 and restricts the lateral movement of the bottom of the butt position; the top of the butt position has a top positioning structure, and the top positioning structure restricts the lateral relative movement of the tops of the two butt ends 400.

[0039] The above-provided bridge structure based on the assembly connection of steel box girders has the following structural and functional advantages:

[0040] First of all, by sequentially arranging a plurality of steel box girders 200 across and abutting against the support structure from top to bottom and being fixed together by welding, the stability of the bridge structure is enhanced, and the deformation caused by external loads and environmental factors is effectively resisted;

[0041] Secondly, the tops of the steel box girders 200 are pieced together to form a flat bridge surface, and a paint is sprayed on the bridge surface to form an integrated bridge surface layer 201, which not only improves the durability of the bridge surface layer 201 but also enhances the bearing capacity of the bridge structure;

[0042] Furthermore, the butt end 400 of the steel box girder 200 is located above the middle pier 300 in the support structure, further enhancing the longitudinal stability of the bridge structure. The bottom positioning structure of the butt position is embedded in the middle pier 300, restricting the lateral relative movement of the bottoms of the two butt ends 400, while the top positioning structure restricts the lateral relative movement at the top, ensuring the stability of the steel box girder 200 at the butt position, preventing structural instability caused by the action of lateral forces, and making the overall bridge structure more stable and safe.

[0043] In this embodiment, along the transverse direction of the docking position, the bottom positioning structure and the top positioning structure are arranged in a staggered manner. Through the staggered arrangement, a more balanced supporting force can be provided, reducing the structural deformation caused by uneven loads, thereby enhancing the lateral stability of the bridge structure.

[0044] In this embodiment, the support structure includes two end piers respectively arranged at the ends of the bridge position 100, and the middle pier 300 is arranged between the two end piers. The end of the steel box girder 200 abuts against the end piers from top to bottom. Through the reasonable layout of the end piers and the middle pier 300, the effective support for the steel box girder 200 is realized, enhancing the longitudinal stability of the bridge structure and at the same time providing a more uniform load distribution for the bridge structure.

[0045] In this embodiment, the steel box girder 200 includes a bridge deck 203 and a bridge bottom plate 202 arranged below the bridge deck 203. There is a beam inner cavity 204 between the bridge deck 203 and the bridge bottom plate 202, and an internal support structure is provided in the beam inner cavity 204. The internal support structure connects the bridge deck 203 and the bridge bottom plate 202 into one body; the top of the bridge deck 203 forms a top surface. In this way, the internal support structure in the beam inner cavity 204 provides additional support, enhancing the overall rigidity of the steel box girder 200 and improving the load-bearing capacity and bending resistance of the bridge structure.

[0046] In this embodiment, the internal support structure includes a plurality of longitudinal support plates 205. The plurality of longitudinal support plates 205 are arranged along the length direction of the steel box girder 200. The bottom of the longitudinal support plate 205 abuts against the bridge bottom plate 202, and the top of the longitudinal support plate 205 abuts against the bridge deck 203. In this way, the longitudinal support plate 205 can provide continuous support along the length direction, enhancing the longitudinal stability and overall torsional resistance of the steel box girder 200.

[0047] In this embodiment, the internal support structure includes a plurality of transverse support plates 206. The plurality of transverse support plates 206 are arranged at intervals along the length direction of the steel box girder 200 and extend along the width direction of the steel box girder 200; the bottom of the transverse support plate 206 abuts against the bridge bottom plate 202, the top of the transverse support plate 206 abuts against the bridge deck 203, and the end of the transverse support plate 206 abuts against the longitudinal support plate 205. In this way, the transverse support plate 206 can provide spaced support along the width direction, enhancing the lateral stability and overall bending resistance of the steel box girder 200.

[0048] In this embodiment, the bottom positioning structure includes a positioning block 301 protruding from the bottom of the bridge floor slab 202 and a positioning groove 302 formed in the middle pier 300. The positioning blocks 301 of adjacent bridge floor slabs 202 elastically abut against each other, the two positioning blocks 301 are embedded in the positioning groove 302, and the outer periphery of the positioning block 301 abuts against the inner side wall of the positioning groove 302 and is relatively fixed in the positioning groove 302. Through the cooperation of the positioning block 301 and the positioning groove 302, the lateral movement of the steel box girder 200 is restricted, and the lateral stability of the bridge structure is improved.

[0049] In this embodiment, the positioning block 301 has a butt joint surface facing the adjacent steel box girder 200. The middle of the butt joint surface is recessed inward to form a middle groove 303. The butt joint surface is recessed inward to form a plurality of ray grooves 304 arranged in a radial pattern. The plurality of ray grooves 304 are arranged at intervals around the circumference of the middle groove 303. The inner ends of the ray grooves 304 face the middle groove 303 and are arranged with a partition between them. The outer ends of the ray grooves 304 extend towards the outer periphery of the butt joint surface and are arranged with a partition from the outer periphery of the butt joint surface.

[0050] The butt joint surfaces of two adjacent positioning blocks 301 are butted against each other, the middle grooves 303 of the two butt joint surfaces communicate with each other, and the plurality of ray grooves 304 of the two butt joint surfaces communicate with each other respectively. A middle elastic body is embedded in the two middle grooves 303, a ray elastic body is embedded in the ray grooves 304 that communicate with each other, and the middle elastic body and the ray elastic body are respectively in a compressed state.

[0051] By providing the recessed middle groove 303 and ray grooves 304 in the middle of the butt joint surface, the contact area and friction force between the positioning block 301 and the steel box girder 200 are increased, thereby improving the stability and anti-slip ability of the structure; the communication setting of the middle groove 303 and the ray grooves 304 enables the elastic bodies embedded therein to evenly disperse stress when compressed, enhancing the energy absorption ability and anti-impact performance of the structure, effectively improving the stability of the steel box girder 200 under lateral and longitudinal loads, reducing the displacement caused by temperature changes or traffic loads, and extending the service life of the bridge structure.

[0052] In this embodiment, the top positioning structure includes an arc surface groove 401 provided on one docking end 400 and an arc-shaped block 402 provided on the other docking end. The bottom of the arc surface groove 401 is in an arc shape, the outer periphery of the arc-shaped block 402 is in an arc shape, the arc-shaped block 402 is movably placed in the arc surface groove 401, the outer periphery of the arc-shaped block 402 abuts against the bottom of the arc-shaped groove, and the arc-shaped block 402 and the arc surface groove 401 cooperate to restrict the lateral relative movement of the tops of the two docking segments.

[0053] In this way, the top positioning structure can ensure the lateral stability of the docking end 400 while allowing a certain degree of longitudinal displacement to adapt to the minor deformations of the bridge structure under different temperature and load conditions. The mobility of the arc-shaped blocks 402 enables the structure to have a certain elastic deformation space when stressed, reducing stress concentration, thereby improving the fatigue life and reliability of the structure.

[0054] In this embodiment, a plurality of arc-shaped blocks 402 are provided on the other docking end. The plurality of arc-shaped blocks 402 are arranged at intervals along the height direction of the docking end. There is an interval 404 between adjacent arc-shaped blocks 402. The plurality of arc-shaped blocks 402 are embedded in the arc surface groove 401, and the outer peripheries of the plurality of arc-shaped blocks 402 are all abutted against the bottom of the arc surface groove 401.

[0055] The outer periphery of the arc-shaped block 402 is covered with an elastic layer 403. The outer periphery of the elastic block abuts against the bottom of the arc surface groove 401 and is in a compressed deformation state.

[0056] By arranging a plurality of arc-shaped blocks 402 on the other docking end and covering the outer periphery of the arc-shaped blocks 402 with an elastic layer 403, a layered elastic support structure is formed, which not only improves the lateral stability of the docking end 400, but also, due to the arc surface design of the elastic blocks, can provide a certain elastic buffer while ensuring the overall stability of the structure, absorbing and reducing vibrations and impacts caused by traffic loads, wind loads, etc. The cooperation between the arc-shaped blocks 402 and the arc surface groove 401, as well as the compressed deformation state of the elastic blocks, jointly act to limit the top lateral relative movement of the docking section, enhancing the seismic resistance and dynamic response ability of the elastic support structure, thereby improving the overall stability and safety of the bridge structure.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. The bridge structure based on the assembly connection of steel box girders is characterized in that It includes a support structure arranged at the bridge position and a plurality of steel box girders arranged on the support structure. The plurality of steel box girders are arranged across in sequence along the width direction of the bridge position and abut against the support structure from top to bottom. The steel box girder has a docking end facing an adjacent steel box girder, and the docking sections of the adjacent steel box girders are docked and fixed together by welding. The top of the steel box girder has a flat top surface, and the top surfaces of the plurality of steel box girders form a flat bridge surface. A paint is sprayed on the bridge surface to form a bridge surface layer. The bridge surface layer covers the bridge surface and forms an integral body with the bridge surface. The support structure includes a middle pier arranged in the middle of the bridge position. The docking ends of the steel box girders are located above the middle pier. The docking ends of the adjacent steel box girders are docked and fixed to form a docking section, and the docking section abuts against the middle pier from top to bottom. The bottom of the docking position has a bottom positioning structure, and the bottom positioning structure is embedded in the middle pier. The bottom positioning structure restricts the lateral relative movement of the bottoms of the two docking ends and restricts the lateral movement of the bottom of the docking position. The top of the docking position has a top positioning structure, and the top positioning structure restricts the lateral relative movement of the tops of the two docking ends.

2. The bridge structure based on the assembly connection of steel box girders as claimed in claim 1, wherein Along the lateral direction of the docking position, the bottom positioning structure and the top positioning structure are arranged in a staggered manner.

3. The bridge structure based on the assembly connection of steel box girders as described in claim 1, wherein, The support structure includes two end piers respectively arranged at the ends of the bridge position. The middle pier is arranged between the two end piers, and the ends of the steel box girders abut against the end piers from top to bottom.

4. The bridge structure based on the assembly connection of steel box girders according to claim 1, characterized in that, The steel box girder includes a bridge deck and a bridge bottom plate arranged below the bridge deck. There is a beam inner cavity between the bridge deck and the bridge bottom plate, and an internal support structure is arranged in the beam inner cavity. The internal support structure connects the bridge deck and the bridge bottom plate into an integral body. The top of the bridge deck forms the top surface.

5. The bridge structure based on the assembly connection of steel box girders as described in claim 4, characterized in that, The internal support structure includes a plurality of longitudinal support plates, and the plurality of longitudinal support plates extend along the length direction of the steel box girder. The bottom of the longitudinal support plate is docked on the bridge bottom plate, and the top of the longitudinal support plate is docked on the bridge deck.

6. The bridge structure based on the assembly connection of steel box girders as described in claim 5, characterized in that, The internal support structure includes a plurality of transverse support plates, and the plurality of transverse support plates are arranged at intervals along the length direction of the steel box girder. The transverse support plates extend along the width direction of the steel box girder. The bottom of the transverse support plate is docked on the bridge bottom plate, the top of the transverse support plate is docked on the bridge deck, and the end of the transverse support plate is docked with the longitudinal support plate.

7. The bridge structure based on the assembly connection of steel box girders according to any one of claims 1-6, characterized in that, The bottom positioning structure includes a positioning block protruding from the bottom of the bridge bottom plate and a positioning groove formed in the middle pier. The positioning blocks of the adjacent bridge bottom plates elastically abut against each other, and the two positioning blocks are embedded in the positioning groove. The outer periphery of the positioning block abuts against the inner side wall of the positioning groove and is relatively fixed in the positioning groove.

8. The bridge structure based on the assembly connection of steel box girders according to claim 7, characterized in that The positioning block has a butt joint surface facing the adjacent steel box girder. The middle part of the butt joint surface is recessed inward to form a middle groove. The butt joint surface is recessed inward to form a plurality of ray grooves arranged in a radial pattern. The plurality of ray grooves are arranged at intervals around the circumference of the middle groove. The inner ends of the ray grooves face the middle groove and are arranged with a partition between them. The outer ends of the ray grooves extend towards the outer periphery of the butt joint surface and are arranged with a partition from the outer periphery of the butt joint surface. The butt joint surfaces of two adjacent positioning blocks are butt-jointed face to face. The middle grooves of the two butt joint surfaces communicate with each other. The plurality of ray grooves of the two butt joint surfaces communicate with each other respectively. A middle elastic body is embedded in the two middle grooves, and a ray elastic body is embedded in the ray grooves that communicate with each other. The middle elastic body and the ray elastic body are respectively in a compressed state.

9. The bridge structure based on the assembly connection of steel box girders according to any one of claims 1-6, characterized in that, The top positioning structure includes a cambered surface groove provided at one butt joint end and an arc-shaped block provided at the other butt joint end. The bottom of the cambered surface groove is in a circular arc shape, and the outer periphery of the arc-shaped block is in a circular arc shape. The arc-shaped block is movably placed in the cambered surface groove, and the outer periphery of the arc-shaped block abuts against the bottom of the arc-shaped groove. The arc-shaped block and the cambered surface groove cooperate to limit the lateral relative movement of the tops of the two butt joint segments.

10. The bridge structure based on the assembly connection of steel box girders according to claim 9, characterized in that, A plurality of the arc-shaped blocks are provided at the other butt joint end. The plurality of arc-shaped blocks are arranged at intervals along the height direction of the butt joint end. There is an interval between adjacent arc-shaped blocks. The plurality of arc-shaped blocks are embedded in the cambered surface groove, and the outer peripheries of the plurality of arc-shaped blocks all abut against the bottom of the cambered surface groove. The outer periphery of the arc-shaped block is covered with an elastic layer. The outer periphery of the elastic block abuts against the bottom of the cambered surface groove and is in a compressed deformation state.

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