Built-in telescopic device and design and installation method thereof

Abstract

The invention discloses a built-in telescopic device and a design and installation method thereof. The device consists of a deformation steel plate, a bearing beam, a high-temperature-resistant elastic plate, a perforated steel plate and an anchoring steel bar, wherein the deformation steel plate realizes multidirectional displacement compensation through an alternate structure of straight sections and bent sections. The bottom surface of the device is arranged on a low-friction plate, the side surface is connected with a concrete pavement through a perforated steel plate, and the top surface is bonded with an asphalt pavement through a waterproof layer. According to the design method, longitudinal, transverse and vertical displacement of the bridge is adapted through stretching, compression and shear deformation of the bent section steel plate, and rotation in all directions is compensated through deformation difference. The innovation lies in that the telescopic structure is built in, so that a continuous sealing system is formed on the bridge floor, the problems of water seepage and corrosion and hidden dangers of running and bumping of a traditional expansion joint are thoroughly solved, and the requirement for durability improvement of newly-built and reconstructed bridges is met.

Description

Technical Field

[0001] The present invention relates to a bridge engineering structure, specifically a built-in expansion and contraction device and a design and installation method thereof, which is used to adapt to the multi-directional displacement of the bridge caused by temperature changes, concrete shrinkage creep and load, and at the same time achieve bridge deck continuity. Background Art

[0002] Bridges experience significant longitudinal deformation of their main beams due to temperature fluctuations, concrete shrinkage and creep, and vehicle braking forces. To relieve these deformation stresses, traditional bridges incorporate expansion joints at the ends of the main beams. Currently, mainstream expansion joints include modular, comb-plate, and seamless types. All are externally mounted—meaning the bridge deck is disconnected at the expansion joint, leaving the joint exposed.

[0003] There are two major defects in the external expansion device: first, water on the bridge deck seeps into the ends of the main beams and the pier cap beams through the cracks. Corrosive substances such as deicing salt and oil in the water cause the concrete to rust and crack, and the steel bars to corrode, seriously reducing the durability of the structure; second, the uneven bridge deck at the expansion joint causes vehicles to "jump" when passing through, affecting driving safety and comfort.

[0004] Corrosion is a particularly prominent problem for bridges used to transport hazardous chemicals. While existing technologies attempt to improve water resistance through improved sealing strips or materials, the inherent nature of external designs makes it impossible to eliminate cracks. Therefore, an internal expansion device is urgently needed to maintain bridge deck continuity while preserving the cracks in the main beam, fundamentally addressing the leakage and vehicle bouncing issues. Summary of the Invention

[0005] In response to the defects of the external telescopic device, the present invention provides a built-in telescopic device and its design and installation method, which adapts to the displacement of the main beam through the multi-directional deformation ability of the deformable steel plate, and at the same time uses a layered structure to achieve bridge deck continuity, completely eliminating the hidden dangers of water erosion and driving bumps.

[0006] In order to solve the above technical problems, the technical solution proposed in this application is: A built-in telescopic device, comprising: Deformed steel plate, which is composed of straight steel plate and bent steel plate connected alternately; A load-bearing beam bonded to the inner surface of the straight steel plate; High-temperature resistant elastic plates covering the top, bottom, front and back surfaces of the built-in telescopic device; wherein the high-temperature resistant elastic plates on the top and bottom surfaces are bonded to the outer surface of the straight section steel plate, and the high-temperature resistant elastic plates on the front and back surfaces are bonded to both ends of the load-bearing beam; The perforated steel plate has a double-perforated structure, with the inner side embedded in the load-bearing beam and the outer side connected to the concrete pavement; Anchor steel bars are inserted into the holes of the perforated steel plates.

[0007] Furthermore, the contact surface between the load-bearing beam and the concrete pavement is roughened.

[0008] On the other hand, the present application also seeks protection for a design method of the aforementioned built-in telescopic device, comprising: Step 1: Design of bending section steel plate The geometric shape of the bending section steel plate is formulated, and the sum of the plane projection lengths of all the inclined steel plates in a single bending section steel plate is taken as its longitudinal design displacement; Calculate the maximum stress of a single bending section steel plate when the longitudinal design displacement occurs, and control the stress within the allowable value of the specification by adjusting the steel plate thickness; Divide the required longitudinal deformation between adjacent main beams by the above-mentioned longitudinal design displacement to obtain the number of steel plates in the bending section; Step 2: Load Beam Design The geometric shape of the initial load-bearing beam; The number of load-bearing beams is determined to be the number of steel plates in the bending section plus one; Calculate the maximum stress of the load-bearing beam under the most unfavorable load combination and control the stress within the allowable value of the specification by adjusting the longitudinal length; Step 3: Design of built-in telescopic device The longitudinal length of a single straight section of steel plate is determined to be the longitudinal length of a single load-bearing beam plus the length of two flanges; The longitudinal length of the deformed steel plate is determined to be the sum of the longitudinal lengths of all straight sections and bent sections; The lateral width of the deformed steel plate is determined to be the lateral width of the concrete pavement, and the height is determined to be the thickness of the concrete pavement minus the thickness of the low-friction plate; Make sure that the longitudinal allowable deformation value of the high temperature resistant elastic plate is not less than the sum of the longitudinal design displacements of the steel plates in the bending section.

[0009] Furthermore, the lateral displacement between adjacent linking main beams is achieved by shear deformation of the steel plates of the bent sections.

[0010] Furthermore, the vertical displacement between adjacent connecting main beams is achieved by the vertical deformation of the steel plates of the bent sections.

[0011] Furthermore, the rotation around the longitudinal direction between adjacent connecting main beams is achieved by the vertical deformation difference of the steel plate of the bending section.

[0012] Furthermore, the lateral rotation between adjacent connecting main beams is achieved by the longitudinal deformation difference of the steel plates in the bent sections.

[0013] Furthermore, the vertical rotation between adjacent main beams is achieved by the lateral deformation difference of the steel plates in the bent sections.

[0014] On the other hand, the present application further claims protection for a method for installing the aforementioned built-in telescopic device, comprising the following steps: Step 1: Factory prefabricated built-in telescopic device: First, a temporary fixing device is used to fix the deformed steel plate and the perforated steel plate, and anchor steel bars are inserted into the holes of the perforated steel plate; Secondly, cast the load-bearing beam, remove the temporary fixing device after reaching the designed strength and rigidity, and roughen the contact surface between the load-bearing beam and the concrete pavement; Finally, the high temperature resistant elastic plate is bonded; Step 2: Install the built-in telescopic device on site: First, install and fix the low friction plate on the top surface of the main beam; Secondly, the built-in telescopic device is placed on the top surface of the low-friction plate and the concrete pavement is poured on site; Finally, after the concrete pavement meets the design requirements, the waterproof layer is laid or painted, followed by the asphalt pavement to complete the bridge deck construction.

[0015] Furthermore, the low-friction plate is arranged between the main beam and the built-in telescopic device.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows: The built-in expansion device provided in this application realizes multi-directional displacement compensation through the bent section of the deformed steel plate, so that the bridge deck forms a continuous sealed structure, fundamentally eliminating the problem of moisture infiltration at traditional expansion joints, and effectively preventing corrosion of the main beam ends and piers; at the same time, the bridge deck pavement layer is smoothly connected, completely solving the problem of vehicle jumping during driving, and significantly improving safety and comfort; its built-in design has the ability to adapt to complex displacements of bridges, and is suitable for the durability improvement needs of newly built and renovated bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a large-scale installation drawing of a built-in telescopic device.

[0019] Figure 2 This is an elevation view of a built-in telescopic device.

[0020] Figure 3 This is a plan view of a built-in telescopic device.

[0021] Figure 4 This is a large-scale drawing of the deformed steel plate.

[0022] The figures used in this application are: asphalt pavement 1, waterproof layer 2, built-in telescopic device 3, low-friction plate 4, concrete pavement 5, main beam 6; the built-in telescopic device 3 includes a deformed steel plate 31, a load-bearing beam 32, a high-temperature resistant elastic plate 33, a perforated steel plate 34, and an anchoring steel bar 35; the deformed steel plate 31 is composed of a straight section steel plate 311 and a bent section steel plate 312. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0024] like Figure 1-4 As shown, in an embodiment of the present application, a built-in telescopic device includes: The deformed steel plate 31 is composed of a straight section steel plate 311 and a bent section steel plate 312 connected alternately; The load-bearing beam 32 is bonded to the inner surface of the straight steel plate 311; High-temperature resistant elastic plates 33 covering the top, bottom, front, and back surfaces of the built-in telescopic device; wherein the high-temperature resistant elastic plates 33 on the top and bottom surfaces are bonded to the outer surface of the straight steel plate 311, and the high-temperature resistant elastic plates 33 on the front and back surfaces are bonded to both ends of the load-bearing beam 32; The perforated steel plate 34 is a double-perforated structure, with the inner side pre-buried in the load-bearing beam 32 and the outer side connected to the concrete pavement 5; The anchoring steel bars 35 are inserted through the holes of the perforated steel plate 34 .

[0025] In an embodiment of the present application, a built-in telescopic device is provided, wherein the contact surface between the load-bearing beam 32 and the concrete pavement 5 is roughened.

[0026] In an embodiment of the present application, a design method for a built-in telescopic device includes: Step 1: Design of 312 steel plate for bending section The geometric shape of the bending section steel plate 312 is formulated, and the sum of the plane projection lengths of all the inclined steel plates in a single bending section steel plate 312 is used as its longitudinal design displacement; Calculate the maximum stress of the steel plate 312 in a single bending section when the longitudinal design displacement occurs, and control the stress within the allowable value of the specification by adjusting the thickness of the steel plate; The number of the bent section steel plates 312 is obtained by dividing the longitudinal deformation requirement between adjacent main beams 6 by the longitudinal design displacement. Step 2: Design of Load Beam 32 The geometric shape of the initial load-bearing beam 32; The number of the load-bearing beams 32 is determined to be the number of the bent section steel plates 312 plus one; Calculate the maximum stress of the load-bearing beam 32 under the most unfavorable load combination, and control the stress within the allowable value of the specification by adjusting the longitudinal length; Step 3: Design of built-in telescopic device 3 The longitudinal length of a single straight steel plate 311 is determined to be the longitudinal length of a single load-bearing beam 32 plus the length of two flanges; The longitudinal length of the deformed steel plate 31 is determined to be the sum of the longitudinal lengths of all the straight steel plates 311 and the bent steel plates 312; The lateral width of the deformed steel plate 31 is determined to be the lateral width of the concrete pavement 5, and the height is determined to be the thickness of the concrete pavement 5 minus the thickness of the low-friction plate 4; It is determined that the longitudinal allowable deformation value of the high temperature resistant elastic plate 33 is not less than the sum of the longitudinal design displacements of the bending section steel plate 312 .

[0027] In an embodiment of the present application, a design method for a built-in telescopic device is provided, in which the lateral displacement between adjacent connecting main beams 6 is achieved by shear deformation of the bent section steel plate 312 .

[0028] In an embodiment of the present application, a design method for a built-in telescopic device is provided, in which the vertical displacement between adjacent connecting main beams 6 is achieved by vertical deformation of the bent section steel plate 312 .

[0029] In an embodiment of the present application, a design method for a built-in telescopic device is provided, in which the rotation between adjacent connecting main beams 6 about the longitudinal direction is achieved by the vertical deformation difference of the bent section steel plate 312 .

[0030] In an embodiment of the present application, a design method for a built-in telescopic device is provided, in which the lateral rotation between adjacent connecting main beams 6 is achieved by the longitudinal deformation difference of the bent section steel plate 312 .

[0031] In an embodiment of the present application, a design method for a built-in telescopic device is provided, in which the vertical rotation between adjacent connecting main beams 6 is achieved by the lateral deformation difference of the bent section steel plate 312 .

[0032] In an embodiment of the present application, a method for installing a built-in telescopic device includes the following steps: Step 1: Factory prefabricated built-in telescopic device 3: First, a temporary fixing device is used to fix the deformed steel plate 31 and the perforated steel plate 34, and an anchoring steel bar 35 is inserted into the opening of the perforated steel plate 34; Secondly, cast the load-bearing beam 32, remove the temporary fixing device after reaching the designed strength and rigidity, and roughen the contact surface between the load-bearing beam 32 and the concrete pavement 5; Finally, the high temperature resistant elastic plate 33 is bonded; Step 2: On-site installation of built-in telescopic device 3: First, install and fix the low friction plate 4 on the top surface of the main beam 6; Secondly, the built-in telescopic device 3 is placed on the top surface of the low-friction plate 4, and the concrete pavement 5 is poured on site; Finally, after the concrete pavement 5 meets the design requirements, the waterproof layer 2 is laid or painted, followed by the asphalt pavement 1 to complete the bridge deck construction.

[0033] In an embodiment of the present application, a method for installing a built-in telescopic device is provided, wherein the low-friction plate 4 is disposed between the main beam 6 and the built-in telescopic device 3 .

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A built-in telescopic device, characterized in that: include: The deformed steel plate (31) is composed of a straight section steel plate (311) and a bent section steel plate (312) connected alternately; A load-bearing beam (32) bonded to the inner surface of the straight steel plate (311); A high temperature resistant elastic plate (33) covering the top surface, bottom surface, front surface and back surface of the built-in telescopic device; The high-temperature resistant elastic plates (33) on the top and bottom surfaces are bonded to the outer surface of the straight section steel plate (311), and the high-temperature resistant elastic plates (33) on the front and back surfaces are bonded to both ends of the load-bearing beam (32); The perforated steel plate (34) is a double-perforated structure, the inner side of which is pre-buried in the load-bearing beam (32) and the outer side is connected to the concrete pavement (5); Anchor steel bars (35) are provided through the holes of the perforated steel plate (34).

2. The built-in telescopic device according to claim 1, characterized in that: The contact surface between the load-bearing beam (32) and the concrete pavement (5) is roughened.

3. A design method for a built-in telescopic device according to claim 1 or 2, characterized in that: include: Step 1: Design of bending section steel plate (312) The geometric shape of the bending section steel plate (312) is proposed, and the sum of the plane projection lengths of all the inclined steel plates in a single bending section steel plate (312) is used as its longitudinal design displacement; Calculate the maximum stress of a single bending section steel plate (312) when the longitudinal design displacement occurs, and control the stress within the allowable value of the specification by adjusting the thickness of the steel plate; The longitudinal deformation requirement between adjacent main beams (6) is divided by the longitudinal design displacement to obtain the number of bending section steel plates (312); Step 2: Design of load-bearing beam (32) The geometric shape of the initially proposed load-bearing beam (32); Determine the number of load-bearing beams (32) to be the number of bent section steel plates (312) plus one; Calculate the maximum stress of the load-bearing beam (32) under the most unfavorable load combination, and control the stress within the allowable value of the specification by adjusting the longitudinal length; Step 3: Design of built-in telescopic device (3) Determine the longitudinal length of a single straight steel plate (311) as the longitudinal length of a single load-bearing beam (32) plus the lengths of two flanges; Determining the longitudinal length of the deformed steel plate (31) as the sum of the longitudinal lengths of all the straight steel plates (311) and the bent steel plates (312); Determine that the transverse width of the deformed steel plate (31) is the transverse width of the concrete pavement (5), and the height is the thickness of the concrete pavement (5) minus the thickness of the low-friction plate (4); The longitudinal allowable deformation value of the high temperature resistant elastic plate (33) is determined to be not less than the sum of the longitudinal design displacements of the bending section steel plate (312).

4. The design method according to claim 3, wherein: The transverse displacement between adjacent main beams (6) is achieved by shear deformation of the bent section steel plates (312).

5. The design method according to claim 3, wherein: The vertical displacement between adjacent joint main beams (6) is achieved by vertical deformation of the bent section steel plates (312).

6. The design method according to claim 3, wherein: The rotation between adjacent main beams (6) about the longitudinal direction is achieved by the vertical deformation difference of the bent section steel plates (312).

7. The design method according to claim 3, characterized in that: The rotation between adjacent main beams (6) about the transverse direction is achieved by the longitudinal deformation difference of the bent section steel plate (312).

8. The design method according to claim 3, wherein: The vertical rotation between adjacent main beams (6) is achieved by the transverse deformation difference of the bent section steel plates (312).

9. A method for installing a built-in telescopic device according to claim 1 or 2, characterized in that: The following steps are involved: Step 1: Factory prefabrication of built-in telescopic device (3): First, a temporary fixing device is used to fix the deformed steel plate (31) and the perforated steel plate (34), and an anchoring steel bar (35) is inserted into the opening of the perforated steel plate (34); Secondly, the load-bearing beam (32) is cast, and after reaching the designed strength and stiffness, the temporary fixing device is removed, and the contact surface between the load-bearing beam (32) and the concrete pavement (5) is roughened; Finally, bonding the high temperature resistant elastic plate (33); Step 2: On-site installation of the built-in telescopic device (3): First, a low friction plate (4) is installed and fixed on the top surface of the main beam (6); Secondly, the built-in telescopic device (3) is placed on the top surface of the low-friction plate (4), and the concrete pavement (5) is poured on site; Finally, after the concrete pavement (5) meets the design requirements, the waterproof layer (2) is laid or painted, and then the asphalt pavement (1) is constructed to complete the bridge deck system construction.

10. The installation method according to claim 9, characterized in that: The low-friction plate (4) is arranged between the main beam (6) and the built-in telescopic device (3).

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