Expansion joint structure

Abstract

The application discloses a kind of expansion joint structures, including reserved notch, the reserved notch is equipped with embedded steel plate and embedded steel wall, embedded steel plate is laid post-cast concrete, post-cast concrete is equipped with support assembly for supporting middle beam, end side beam assembly and middle side beam assembly;Support assembly and side beam assembly are alternately arranged along the length direction of middle beam, and end side beam assembly and middle side beam assembly are symmetrically connected on the two sides of middle beam;Middle beam is connected with support assembly, end side beam assembly and middle side beam assembly by rubber strip respectively.The application uses sectional design, segmented installation and replacement according to actual needs, so that bridge structure is more flexible, and more adaptable.At the same time, the use rate of special-shaped steel is reduced, which greatly improves the production rate of each component of the composite beam, while reducing the production cost, achieving the purpose of increasing stability, reliability and safety, which has great significance for the development of modern expansion joint structure.

Description

Technical Field

[0001] This invention belongs to the field of expansion joint technology, and in particular relates to an expansion joint structure. Background Technology

[0002] Expansion joints are a common structural design feature in building engineering, used to accommodate expansion and contraction displacements caused by temperature changes, seismic effects, and foundation settlement. They are typically constructed of elastic materials, metal plates, or specially designed components and are placed at joints in building structures or bridges. The design of expansion joints considers the expansion and contraction properties of building materials, as well as the deformation characteristics of buildings under different working conditions. The aim is to reduce internal stress concentration, protect the integrity and stability of the building structure, and ensure the safe operation of the building under various environmental and external force loads.

[0003] The main drawbacks of traditional modular expansion joints are beam fractures and damage to elastic components in the support and displacement system. Most current designs do not consider future maintenance, and the narrow space of the structural joints prevents personnel from accessing from below. When vulnerable components age, even if the concrete is intact, the entire structure must be dismantled, and frequent dismantling can easily damage the beams, affecting the overall lifespan of the bridge. Direct replacement costs are extremely high, both in terms of cost and social impact. Secondly, existing designs, such as the Chinese patent application number 2022217226715 entitled "A Bridge Expansion Joint Structure for Dust Prevention," extensively use irregularly shaped steel. Irregularly shaped steel is highly susceptible to defects during installation, making construction difficult and significantly impacting subsequent pre-testing. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide an expansion joint structure that is simple to install and easy to maintain.

[0005] Technical solution: The expansion joint structure of the present invention includes a reserved slot, in which a pre-embedded steel plate and a pre-embedded steel wall are provided. Post-cast concrete is laid on the pre-embedded steel plate, and a support assembly, an end side beam assembly, and a middle side beam assembly for supporting the central beam are provided on the post-cast concrete. The support assembly and the side beam assembly are alternately arranged along the length of the central beam, and the end side beam assembly and the middle side beam assembly are symmetrically connected on both sides of the central beam. The central beam is connected to the support assembly, the end side beam assembly, and the middle side beam assembly respectively through rubber strips.

[0006] The support assembly includes a bottom steel plate laid on the post-cast concrete, a lower steel plate and a support steel pipe installed on the bottom steel plate, a support beam installed on the lower steel plate, upper steel blocks installed on the upper parts of both ends of the support beam, fixed welded parts installed on the upper steel blocks, a support C-shaped steel on one side of the fixed welded parts, an upper elastic body installed on the fixed welded parts, and a top cover provided on the upper elastic body; the top cover is connected to the pre-embedded steel wall by bolts.

[0007] The embedded steel plate is also provided with first embedded steel bars and second embedded steel bars at equal intervals.

[0008] The end side beam assembly includes a first embedded reinforcing bar, which is connected to one side of a first welded steel sheet. The other side of the first welded steel sheet is connected to a first fixed reinforcing bar. The upper oblique cut surface of the first fixed reinforcing bar is connected to the lower oblique cut surface of the first welded special-shaped steel. The side cut surface of the first welded special-shaped steel is connected to the side of the end C-shaped steel. The bottom surface of the end C-shaped steel is connected to the upper cut surface of the first fixed reinforcing bar.

[0009] The middle side beam assembly includes a second pre-embedded reinforcing bar connected to one side of a second welded steel sheet, a second fixed reinforcing bar connected to the other side of the second welded steel sheet, an upper oblique cut surface of the second fixed reinforcing bar connected to a lower oblique cut surface of the second welded special-shaped steel, a side cut surface of the second welded special-shaped steel connected to the side of the middle C-shaped steel, and a bottom surface of the middle C-shaped steel connected to the upper cut surface of the second fixed reinforcing bar.

[0010] The middle beam is connected to the middle of the support beam at the raised part of the support beam. Rubber strips are installed between the left C-shaped opening and the right C-shaped opening of the middle beam and the C-shaped steel opening of the support, the end C-shaped steel opening and the middle C-shaped steel opening of the support.

[0011] The rubber strip is fixed to the C-shaped opening via two fixed ends.

[0012] The support assembly has at least four sets.

[0013] The reserved slot is provided with a reserved slot for a pre-embedded steel plate.

[0014] The size of the reserved slot is 20mm to 40mm.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following significant advancements: The present invention adopts a segmented design, allowing for segmented installation and replacement according to actual needs, making the bridge structure more flexible and adaptable; due to the segmented design, when a segment has a problem or requires maintenance, only that segment needs to be addressed, without affecting the overall operation of the bridge, greatly reducing maintenance costs and time; at the same time, it reduces the use of irregular-shaped steel, which greatly increases the production rate of the components constituting the composite beam, while reducing production costs, achieving the goal of increasing stability, reliability, and safety, which is of great significance to the development of modern expansion joint structures. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a detailed exploded view of the support assembly in this invention;

[0018] Figure 3 This is a schematic diagram of the end side beam assembly structure used in the embodiments of the present invention;

[0019] Figure 4 This is a schematic diagram of the middle side beam assembly structure used in an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the central beam structure used in an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the rubber strip structure used in the embodiments of the present invention;

[0022] Figure 7 This is a schematic diagram of the post-cast concrete structure used in the embodiments of the present invention;

[0023] Figure 8 This is a schematic diagram of the reserved slot structure used in the embodiments of the present invention. Detailed Implementation

[0024] like Figure 1 As shown, the expansion joint structure of this invention includes a support assembly 1, an end side beam assembly 2, a middle side beam assembly 3, a middle beam 4, a rubber strip 5, post-cast concrete 6, and a reserved groove 7. A groove 701 is symmetrically reserved on both sides of the reserved groove 7. The groove 701 is used to pre-install embedded steel plates 101 and embedded steel walls 102. The embedded steel plates 101 and embedded steel walls 102 are welded together to ensure the stability of the structure. Post-cast concrete 6 is laid on the embedded steel plates to fix the embedded parts. At least four sets of end side beam assemblies 2 and middle side beam assemblies 3 are symmetrically connected on the left and right sides of the bottom of the reserved groove 7. A middle beam 4 is connected between the end side beam assemblies 2 and the middle side beam assemblies 3 to support the middle beam 4. The middle beam 4 is connected to the reserved groove 7 through the support assembly 1. The support assembly 1 and the side beam assembly are alternately arranged at the bottom of the reserved groove 7.

[0025] like Figure 2 As shown, the support assembly 1 includes a bottom steel plate 111 laid on the post-cast concrete 6. A lower steel plate 112 and a support steel pipe 113 are installed on the bottom steel plate 111. A support beam 121 is provided on the lower steel plate 112. Upper steel blocks 115 are provided at the upper parts of both ends of the support beam 121. Fixed welding parts 132 are installed on the upper steel blocks 115. A support C-shaped steel 131 is installed on one side of the fixed welding part 132. The fixed welding part 132 is welded to the inner support C-shaped steel 131. An upper elastic body 141 is installed on the fixed welding part 132. A top cover 151 is provided on the upper elastic body 141. The top cover 151 is fixedly connected to the embedded steel wall 102 by bolts 152 through bolt holes on its upper part. Figure 3As shown, the end side beam assembly 2 includes a first embedded reinforcing bar 201. The first embedded reinforcing bar 201 is welded to one side of a first welded steel sheet 211. The other side of the first welded steel sheet 211 is welded to a first fixed reinforcing bar 221. The upper oblique cut surface 222 of the first fixed reinforcing bar 221 is welded to the lower oblique cut surface 232 of the first welded special-shaped steel 231. The side cut surface 233 of the first welded special-shaped steel 231 is welded to the side surface 244 of the end C-shaped steel 241. The bottom surface 243 of the end C-shaped steel 241 is welded to the upper cut surface 223 of the first fixed reinforcing bar 221. Figure 4 As shown, the middle side beam assembly 3 includes a second embedded reinforcing bar 301. The second embedded reinforcing bar 301 is welded to one side of the second welded steel sheet 311, and to the other side of the second welded steel sheet 311, which is welded to a second fixed reinforcing bar 321. The upper oblique cut surface 322 of the second fixed reinforcing bar 321 is welded to the lower oblique cut surface 332 of the second welded special-shaped steel 331. The side cut surface 333 of the second welded special-shaped steel 331 is welded to the side surface 344 of the middle C-shaped steel 341. The bottom surface 343 of the middle C-shaped steel 341 is welded to the upper cut surface 323 of the second fixed reinforcing bar 321. Figures 5-8 As shown, the middle beam 4 is welded to the support beam 121 at the raised section 122 in the middle of the support beam. The middle beam 4 is connected to the support C-shaped steel 131, the end C-shaped steel 231, and the middle C-shaped steel 341. The middle beam 4 has a left C-shaped opening 411 and a right C-shaped opening 412. The left C-shaped opening 411 and the right C-shaped opening 412 are connected to the support C-shaped steel opening, the end C-shaped steel opening 242, and the middle C-shaped steel opening 342 by rubber strips 5. The rubber strips 5 are fixed to the C-shaped openings through the fixed ends 511 and 512 on both sides. In this embodiment, there are two rubber strips 5, which are installed in the reserved grooves on the left and right sides respectively. In addition, unless otherwise specified, the components are fixed by welding, except for the connection and fixation involving elastic bodies. It should be noted that the expansion joint structure provided in this embodiment of the invention can be used not only in bridge structures but also in other building structures.

[0026] Working Principle: This invention adopts a segmented design, with the support assembly 1 and side beam assembly alternately installed along the length direction within the reserved slot 7 to support the central beam 4. Segmented installation and replacement are performed according to actual needs, making the bridge structure more flexible and adaptable. When a segment malfunctions or requires maintenance, only that segment needs to be addressed without affecting the overall operation of the bridge, significantly reducing maintenance costs and time. Simultaneously, the entire structure uses only two pieces of special-shaped steel, greatly reducing the usage rate of special-shaped steel compared to existing technologies. This reduction in the use of special-shaped steel significantly improves the production rate and assembly efficiency of the components constituting the composite beam, while also reducing the damage rate of special-shaped steel during production, thereby increasing stability, reliability, and safety. This is of great significance for the development of modern expansion joint structures.

Claims

1. An expansion joint structure, comprising a pre-reserved groove (7) for installing a steel plate, characterized in that, The reserved slot (7) is provided with a pre-embedded steel plate (101) and a pre-embedded steel wall (102). The pre-embedded steel plate (101) is covered with post-cast concrete (6). The post-cast concrete (6) is provided with a support assembly (1), an end side beam assembly (2) and a middle side beam assembly (3) for supporting the middle beam (4). The support assembly (1) and the middle side beam assembly (3) are alternately arranged along the length of the middle beam (4). The end side beam assembly (2) and the middle side beam assembly (3) are symmetrically connected on both sides of the middle beam (4). The middle beam (4) is connected to the support assembly (1), the end side beam assembly (2) and the middle side beam assembly (3) respectively through rubber strips (5).

2. The expansion joint structure according to claim 1, characterized in that, The support assembly (1) includes a bottom steel plate (111) laid on the post-cast concrete (6), a lower steel plate (112) and a support steel pipe (113) installed on the bottom steel plate (111), a support beam (121) installed on the lower steel plate (112), upper steel blocks (115) installed on the upper part of both ends of the support beam (121), a fixed welding component (132) installed on the upper steel block (115), a support C-shaped steel (131) installed on one side of the fixed welding component (132), an upper elastic body (141) installed on the fixed welding component (132), and a top cover (151) provided on the upper elastic body (141); the top cover (151) is connected to the pre-embedded steel wall (102) by bolts (152).

3. The expansion joint structure according to claim 1, characterized in that, The embedded steel plate (101) is also provided with a first embedded steel bar (201) and a second embedded steel bar (301) at equal intervals.

4. The expansion joint structure according to claim 3, characterized in that, The end side beam assembly (2) includes a first embedded steel bar (201), which is connected to one side of the first welded steel sheet (211). The other side of the first welded steel sheet (211) is connected to the first fixed steel bar (221). The upper oblique cut surface (222) of the first fixed steel bar (221) is connected to the lower oblique cut surface (232) of the first welded special-shaped steel (231). The side cut surface (233) of the first welded special-shaped steel (231) is connected to the side surface (244) of the end C-shaped steel (241). The bottom surface (243) of the end C-shaped steel (241) is connected to the upper cut surface (223) of the first fixed steel bar (221).

5. The expansion joint structure according to claim 3, characterized in that, The middle side beam assembly (3) includes a second pre-embedded steel bar (301) connected to one side of a second welded steel sheet (311), a second fixed steel bar (321) connected to the other side of the second welded steel sheet (311), an upper oblique cut surface (322) of the second fixed steel bar (321) connected to a lower oblique cut surface (332) of the second welded special-shaped steel (331), a side cut surface (333) of the second welded special-shaped steel (331) connected to a side surface (344) of the middle C-shaped steel (341), and a bottom surface (343) of the middle C-shaped steel (341) connected to an upper cut surface (323) of the second fixed steel bar (321).

6. The expansion joint structure according to claim 1, characterized in that, The middle beam (4) is connected to the middle raised part (122) of the support beam (121). Rubber strips (5) are installed between the left C-shaped opening (411) and the right C-shaped opening (412) of the middle beam (4) and the C-shaped steel opening of the support, the end C-shaped steel opening (242) and the middle C-shaped steel opening (342).

7. The expansion joint structure according to claim 6, characterized in that, The rubber strip (5) is fixed to the C-shaped opening through the fixed ends on both sides.

8. The expansion joint structure according to claim 6, characterized in that, The support assembly (1) has at least four sets.

9. The expansion joint structure according to claim 1, characterized in that, The reserved slot (7) is provided with a reserved slot (701) for a pre-embedded steel plate.

10. The expansion joint structure according to claim 1, characterized in that, The size of the reserved slot (7) is 20mm~40mm.

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