Device for extending and retracting bridge along bridge direction

Abstract

The utility model relates to a bridge expansion device in the bridge direction, and belongs to the technical field of bridge expansion devices. Comprising a waterproof rubber plate fixed between bridge deck concrete plates on the two sides, and further comprises a fixed rotating shaft structure, a movable rotating shaft structure, a top steel plate, an anti-tilting structure and an anchoring structure. The fixed rotating shaft structure and the movable rotating shaft structure are arranged on the left and right sides of the bottom of the top steel plate respectively, the fixed rotating shaft structure is fixed to the top steel plate, and the top of the movable rotating shaft structure frictionally slides with the bottom of the top steel plate. The anti-tilting structure is further arranged on one side of the movable rotating shaft structure at the bottom of the top steel plate and used for limiting vertical displacement of the movable rotating shaft structure; the fixed rotating shaft structure and the movable rotating shaft structure are fixed in the bridge deck concrete slabs on the two sides through anchoring structures. The bridge expansion joint can effectively solve the problems that an existing bridge expansion joint does not have three-way displacement and is insufficient in impact resistance.

Description

Technical Field

[0001] The utility model relates to a bridge expansion device, in particular to a longitudinal bridge expansion device, belonging to the technical field of bridge expansion devices. Background Art

[0002] With the rapid development of China's social economy and transportation industry, the traffic volume has increased sharply. Some of the earliest built highways in domestic developed areas have been severely damaged after years of high-load operation and urgently need to be renovated. At the same time, due to the relatively low economic level in the early stage and not much traffic volume, the early designed highway bridges cannot meet the growing traffic volume demand and must be widened. The widening and renovation of expressways, urban expressways, etc. are imminent. An important aspect of the reconstruction and expansion of expressways, municipal roads, etc. is to widen, expand and renovate existing bridges, especially bridge widening, which plays a crucial role in highway renovation projects.

[0003] Due to the inability to achieve synchronization in many aspects such as shrinkage creep, displacement, and span between the new and old structures, large additional stresses are easily generated at the connection position between the new and old bridges, resulting in structural diseases such as cracking at the connection part after operation. At the same time, the widened bridge usually bears heavy traffic operation requirements. The rigid splicing of the new and old structures requires the complete interruption of traffic on the old bridge during the concrete curing period of the entire joint section, which will bring huge pressure and losses to traffic diversion and operation. Therefore, a longitudinal splicing joint is set at the connection between the new and old bridges, and an expansion device with longitudinal, transverse and vertical displacements is adopted. The new and old structures are separated and do not affect each other. It can not only meet the requirements of longitudinal and transverse mutual displacement and vertical misalignment between beam bodies, but also minimize the interference to traffic. The old bridge can basically not interrupt traffic, which will become a development trend of bridge widening. The existing bridge expansion device standards and specifications do not cover this type of expansion device.

[0004] Through investigation and analysis, it is found that many existing longitudinal expansion joints of new and old bridges directly adopt existing bridge expansion devices. On the one hand, due to the lack of three-way displacement function of the expansion device, on the other hand, since most of the splicing parts are cantilever slabs of the main beam with a relatively thin structure, the conventional modular bridge expansion device cannot be applied or the buried depth is too shallow, resulting in insufficient strength. Due to the low stiffness of the cantilevers on both sides of the expansion joint, the vertical displacement difference between the wheels on the two cantilevers increases the impact force of the wheels on the steel rail, leading to serious damage to the expansion device. For example, a bridge expansion device disclosed in CN2856140Y includes paired steel profiles, with a waterproof rubber strip arranged between the steel profiles. The shapes of both ends of the waterproof rubber strip match the shapes of the steel profiles, and anchor bars are horizontally arranged outside the steel profiles; there is also a filling with elastomeric materials, which cannot withstand the impact of vehicle loads and shows a large number of damages in a short time, unable to ensure the structural safety and design service life of the product in actual projects. For example, CN217997802U discloses a bridge expansion device, including a first beam body, a second beam body and an expansion member. A structural joint is formed between the first beam body and the second beam body. Installation notches for installing the expansion member are opened at the beam ends of the first beam body and the second beam body. A support member is installed in the structural joint, and the support member is located below the expansion member. Elastic seals are poured in the installation notches and between the expansion member and the support member.

[0005] From the investigation of relevant domestic standards, all expansion device standards are for the expansion devices between beams or between a beam and a abutment installed transversely to the bridge axis, and do not cover the expansion devices installed longitudinally to the bridge axis. There are no specifications for the design, manufacture, construction, etc. of longitudinal expansion devices, and only some general guiding clauses of existing expansion device standards can be partially referred to. This results in a large quality difference in the whole process from the design, manufacture to construction completion of longitudinal expansion devices, posing a great safety hazard after being put into operation and greatly increasing the operation and maintenance costs at the same time.

[0006] Therefore, it is necessary to design a special longitudinal expansion device along the bridge axis. Summary of the Utility Model

[0007] In view of the above-mentioned defects existing in the prior art, the present utility model provides a longitudinal expansion device along the bridge axis of a bridge to solve the problems that the existing bridge expansion joints do not have three-way displacement and insufficient impact resistance.

[0008] To achieve the above object, the technical solution adopted by the present utility model is as follows:

[0009] A bridge longitudinal expansion device includes a waterproof rubber sheet fixed between the bridge deck concrete slabs on both sides. The expansion device further includes a fixed rotating shaft structure, a movable rotating shaft structure, a top steel plate, an anti-tilting structure, and an anchoring structure. Among them, the fixed rotating shaft structure and the movable rotating shaft structure are respectively arranged on the left and right sides at the bottom of the top steel plate. The fixed rotating shaft structure is fixed to the top steel plate, and the top of the movable rotating shaft structure slides frictionally with the bottom of the top steel plate. An anti-tilting structure is also arranged on one side of the movable rotating shaft structure at the bottom of the top steel plate to limit the vertical displacement of the movable rotating shaft structure. The fixed rotating shaft structure and the movable rotating shaft structure are both fixed in the bridge deck concrete slabs on both sides through the anchoring structure.

[0010] Further, the fixed rotating shaft structure is mainly composed of a first rotating shaft, a first shaft sleeve, a first end cover, and a first anchoring plate. The top of the first rotating shaft is fixed to the bottom of the top steel plate. The first rotating shaft is sleeved in the first shaft sleeve, and first end covers are arranged at both ends of the first shaft sleeve. A first polytetrafluoroethylene sleeve is also arranged between the first rotating shaft and the first shaft sleeve. First anchoring plates are arranged at intervals on the first shaft sleeve, and an anchoring structure is fixedly arranged on the first anchoring plate.

[0011] Further, the movable rotating shaft structure is mainly composed of a second rotating shaft, a second shaft sleeve, a second end cover, and a second anchoring plate. The second rotating shaft is sleeved in the second shaft sleeve, and second end covers are arranged at both ends of the first shaft sleeve. A second polytetrafluoroethylene sleeve is also arranged between the second rotating shaft and the second shaft sleeve. Second anchoring plates are arranged at intervals on the second shaft sleeve, and an anchoring structure is fixedly arranged on the second anchoring plate. A connecting plate is also fixed to the top of the second rotating shaft, and a planar polytetrafluoroethylene plate is arranged in the groove on the top of the connecting plate. The top surface of the planar polytetrafluoroethylene plate slides relatively with the stainless steel sliding plate at the bottom of the top steel plate.

[0012] Further, first pressing plates are arranged on both sides at the top of the first shaft sleeve; second pressing plates are arranged on both sides at the top of the second shaft sleeve.

[0013] Further, chromium plating layers are arranged on the outer surfaces of the first rotating shaft and the second rotating shaft.

[0014] Further, both the first shaft sleeve and the second shaft sleeve are made of seamless steel pipes, and intermittent welding connections are used between the first anchoring plate and the first shaft sleeve and between the second anchoring plate and the second shaft sleeve.

[0015] Further, the anti-tilting structure is an L-shaped limiting plate, and the connecting plate is also an L-shaped structure that is buckled relative to the L-shaped limiting plate.

[0016] Further, angle irons for protecting the edges are also arranged on the bridge deck concrete slabs on both sides of the top steel plate.

[0017] Further, a sealing rubber sheet is arranged between the angle iron for protecting the edge and the top steel plate.

[0018] Furthermore, the anchoring structure is an anchoring ring.

[0019] By adopting the technical solution of the present utility model, the following technical effects can be achieved:

[0020] The present utility model has the function of three-way displacement and relates to an expansion device installed longitudinally along the bridge. The design, manufacture, and construction of this longitudinal bridge expansion device overcome the lack of implementation specifications or corresponding guiding clauses in the prior art, and can effectively ensure the quality of the longitudinal bridge expansion device from design, manufacture to construction completion, with a large safety factor, low operating cost, and reduced bridge traffic interruption time.

[0021] The present utility model is applicable to newly built bridges and bridges that are not suitable for being consolidated into one body. It connects two parts longitudinally along the bridge, playing the role of not affecting traffic and adapting to the deformation of the beam body.

[0022] The present utility model is applicable to the widening of old bridges. It connects the new and old bridges longitudinally along the bridge, playing the role of not affecting traffic and adapting to the deformation of the beam body.

[0023] The present utility model is particularly applicable to the longitudinal connection part where the longitudinal displacement of the two beam bodies is large, the transverse displacement is small, and the vertical deformation is large. It is applicable to bridges that allow an axle load of less than 20 tons.

[0024] This device can adapt to the longitudinal and transverse displacements of the beam body and the height difference generated by the two side beam bodies; it can ensure the smoothness and comfort of driving.

[0025] The main stress components of the present utility model adopt high-quality carbon steel, polytetrafluoroethylene plates, stainless steel plates, etc., with good durability.

[0026] The pressure plate of the present utility model prevents the polytetrafluoroethylene sleeve from rotating, but does not prevent the rotating shaft from rotating. The end cover prevents the rotating shaft from moving axially along the bushing.

[0027] The waterproof rubber plate of the present utility model can prevent the water on the bridge deck from scouring the bridge pier or abutment, prevent the water on the bridge deck from directly flowing under the bridge or draining directly under the bridge from both sides, but collect it and drain it into the collecting pipe and lead it to the ground drainage ditch.

[0028] The movable rotating shaft structure of the present utility model has the functions of rotation and horizontal displacement. In addition to the functions of the fixed rotating shaft structure, it also has the functions of longitudinal displacement and transverse displacement. The planar friction pair composed of the planar polytetrafluoroethylene plate and the stainless steel sliding plate is composed of a stainless steel plate and a polytetrafluoroethylene plate, with small friction, wear resistance, and long service life.

[0029] The anti-tilting structure of the utility model can play an anti-tilting function when displacement occurs in the longitudinal and transverse directions of the bridge, that is, the structure does not affect the horizontal displacement of the overall telescopic device, but only limits the vertical displacement to prevent the top steel plate from detaching from the lower structure and rising above the road surface. A small gap is reserved in the horizontal direction between the L-shaped limit plate and the connecting plate, so that they do not contact each other when horizontal displacement occurs. When the top steel plate moves upward, the connecting plate and the L-shaped limit plate are "squeezed" to prevent the top plate from tilting. Sufficient gap is reserved in the horizontal direction between the L-shaped limit plate and the connecting plate to ensure that the telescopic device can be freely displaced horizontally. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be understood that the specific shapes and structures shown in the drawings should not usually be regarded as limiting conditions for implementing the present application; for example, based on the technical concepts and exemplary drawings disclosed in the present application, those skilled in the art are able to easily make routine adjustments or further optimizations to the increase / decrease / attribution division, specific shapes, positional relationships, connection methods, dimensional ratio relationships, etc. of certain units (components).

[0031] Figure 1 It is a cross-sectional schematic diagram of the utility model bridge longitudinal expansion and contraction device;

[0032] Figure 2 It is a cross-sectional schematic diagram of the fixed shaft structure of the utility model;

[0033] Figure 3 It is a horizontal cross-sectional schematic diagram of the fixed shaft structure of the utility model;

[0034] Figure 4 It is a schematic cross-sectional view of the movable rotating shaft structure of the utility model;

[0035] Figure 5 This is a schematic diagram of the connection of the anti-warping structure of the utility model;

[0036] Figure 6 It is a three-dimensional diagram of the bridge longitudinal telescopic device of the utility model (without the waterproof rubber plate). DETAILED DESCRIPTION

[0037] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0038] The terms such as "upper", "lower", "left", "right", "middle", etc. used in this application are usually used to facilitate intuitive understanding by comparing with the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.

[0039] The following is combined with Figure 1-6 The utility model is further described in detail with specific implementations to facilitate a clear understanding of the utility model, but they do not constitute a limitation on the utility model.

[0040] Example 1

[0041] As attached Figure 1 and Figure 6 As shown, a bridge longitudinal telescopic device of this embodiment is applied to the connection of newly built bridges in the longitudinal direction. It includes a waterproof rubber sheet 5, a fixed rotating shaft structure 4, a movable rotating shaft structure 6, a top steel plate 3, an anti-warping structure 7 and an anchoring structure 8 fixed between the bridge deck concrete slabs 100 on both sides. In this embodiment, the anchoring structure 8 is an anchoring ring. Among them, the fixed rotating shaft structure 4 and the movable rotating shaft structure 6 are respectively arranged on the left and right sides of the bottom of the top steel plate 3, the fixed rotating shaft structure 4 is fixed to the top steel plate 3, and the top of the movable rotating shaft structure 6 slides with the bottom of the top steel plate 3 by friction. An anti-warping structure 7 is also arranged on one side of the movable rotating shaft structure 6 at the bottom of the top steel plate 3 to limit the vertical displacement of the movable rotating shaft structure 6. The fixed rotating shaft structure 4 and the movable rotating shaft structure 6 are fixed in the bridge deck concrete slabs 100 on both sides through the anchoring structure 8.

[0042] like Figures 2-3 As shown, the fixed shaft structure 4 is mainly composed of a first shaft 46, a first sleeve 44, a first end cover 47 and a first anchor plate 42. The top of the first shaft 46 is fixed to the bottom of the top steel plate 3. The first shaft 46 is sleeved in the first sleeve 44. First end covers 47 are provided at both ends of the first sleeve 44. A first polytetrafluoroethylene sleeve 45 is also provided between the first shaft 46 and the first sleeve 44. A plurality of first anchor plates 42 are arranged at intervals on the first sleeve 44, and an anchor structure 8 buried in a bridge deck concrete slab 100 on one side is fixedly provided on the first anchor plate 42. First pressing plates 43 are provided on both sides of the top of the first sleeve 44.

[0043] As shown Figure 4 As shown, the movable rotating shaft structure 6 mainly consists of a second rotating shaft 63, a second shaft sleeve 65, a second end cover 69, and a second anchor plate 67. The second rotating shaft 63 is sleeved inside the second shaft sleeve 65, and second end covers 69 are arranged at both ends of the first shaft sleeve 44. A second polytetrafluoroethylene sleeve 64 is also arranged between the second rotating shaft 63 and the second shaft sleeve 65. Second pressing plates 66 are arranged on both sides of the top of the second shaft sleeve 65. A plurality of second anchor plates 67 are arranged at intervals on the second shaft sleeve 65, and an anchoring structure 8 buried in the concrete slab 100 of the other side of the bridge deck is fixedly arranged on the second anchor plate 67. A connecting plate 62 is also fixedly arranged at the top of the second rotating shaft 63, and a flat polytetrafluoroethylene plate 61 is arranged in the groove at the top of the connecting plate 62, and the top surface of the flat polytetrafluoroethylene plate 61 slides relative to the stainless steel sliding plate 60 at the bottom of the top steel plate 3.

[0044] As shown Figure 5 As shown, the anti-tilting structure 7 is an L-shaped limiting plate, and the connecting plate 62 is also an L-shaped structure that is relatively buckled with the L-shaped limiting plate. A small gap is reserved between the anti-tilting structure 7 and the connecting plate 62 in the horizontal direction, and they do not contact when horizontal displacement occurs between the two. When the top steel plate 3 moves upward, the connecting plate 62 and the anti-tilting structure 7 are "squeezed to death" to prevent the top steel plate 3 from tilting.

[0045] In this embodiment,

[0046] As shown Figures 1-3 As shown, in this embodiment, enough space is reserved below the top steel plate 3 to facilitate the rotation of the first rotating shaft 46 and the second rotating shaft 63. A layer of chromium plating is arranged on the outer surfaces of the first rotating shaft 46 and the second rotating shaft 63 to reduce the frictional resistance. Both the first shaft sleeve 44 and the second shaft sleeve 65 are made of seamless steel pipes, and intermittent welding connections are used between the first anchor plate 42 and the first shaft sleeve 44, and between the second anchor plate 67 and the second shaft sleeve 65 to increase the stiffness of each shaft sleeve and prevent each rotating shaft from disengaging from its corresponding shaft sleeve.

[0047] As shown Figure 1 and Figure 6 As shown, angle irons 1 for protecting the corners are also arranged on the concrete slabs 100 of the bridge deck on both sides of the top steel plate 3 to protect the edges of the concrete slabs 100 of the bridge deck from being damaged by the impact of vehicle tires. A sealing rubber plate 2 is arranged between the angle irons 1 for protecting the corners and the top steel plate 3. The sealing rubber plate 2 can play the functions of waterproofing and dustproofing during the rotation and horizontal displacement of the top steel plate 3, and can provide a rotating space during the rotation of the top plate. The upper surface of the top steel plate 3 is processed with anti-slip grooves (not shown in the figure) to prevent "slipping" during vehicle passage or braking and provide sufficient frictional force.

[0048] For the application of the above bridge longitudinal expansion device, the bridge longitudinal expansion device is applied to the connection of newly built bridges, the longitudinal connection of widened old bridges, and the connection of building deformation joints.

[0049] Embodiment 2

[0050] In this embodiment, the longitudinal expansion device of the bridge is used for the longitudinal connection of the widening of the old bridge. Other structures are the same as those in Embodiment 1 and will not be elaborated here.

[0051] Embodiment 3

[0052] In this embodiment, the longitudinal expansion device is used for the connection of the deformation joint of the building. Other structures are the same as those in Embodiment 1 and will not be elaborated here.

[0053] The above are only the preferred embodiments of the present utility model, and do not impose any formal restrictions on the structure of the present utility model. The layout type and the number of uses of the present utility model are not limited to this example, and can be optimized according to the actual project. Any modification, equivalent change and decoration made to the above embodiments based on the technical principle of the present utility model without departing from the content of the technical solution of the present utility model are still within the scope of the technical solution of the present utility model.

Claims

1. A bridge longitudinal expansion device, comprising a waterproof rubber sheet (5) fixed between bridge deck concrete slabs (100) on both sides, characterized in that: The telescopic device also includes a fixed rotating shaft structure (4), a movable rotating shaft structure (6), a top steel plate (3), an anti-tilting structure (7) and an anchoring structure (8); wherein the fixed rotating shaft structure (4) and the movable rotating shaft structure (6) are respectively arranged on the left and right sides of the bottom of the top steel plate (3), the fixed rotating shaft structure (4) is fixed to the top steel plate (3), and the top of the movable rotating shaft structure (6) and the bottom of the top steel plate (3) slide frictionally; the anti-tilting structure (7) is also arranged on one side of the movable rotating shaft structure (6) at the bottom of the top steel plate (3) to limit the vertical displacement of the movable rotating shaft structure (6); the fixed rotating shaft structure (4) and the movable rotating shaft structure (6) are both fixed to the bridge deck concrete slabs (100) on both sides through the anchoring structure (8).

2. The bridge longitudinal expansion device according to claim 1 is characterized in that: The fixed rotating shaft structure (4) mainly consists of a first rotating shaft (46), a first shaft sleeve (44), a first end cover (47) and a first anchor plate (42); the top of the first rotating shaft (46) is fixed to the bottom of the top steel plate (3); the first rotating shaft (46) is sleeved in the first shaft sleeve (44); first end covers (47) are arranged at both ends of the first shaft sleeve (44); a first polytetrafluoroethylene sleeve (45) is also arranged between the first rotating shaft (46) and the first shaft sleeve (44); a first anchor plate (42) is arranged on the first shaft sleeve (44) at intervals; and an anchor structure (8) is fixedly arranged on the first anchor plate (42).

3. The bridge longitudinal expansion and contraction device according to claim 2, characterized in that: The movable rotating shaft structure (6) mainly consists of a second rotating shaft (63), a second shaft sleeve (65), a second end cover (69) and a second anchor plate (67). The second rotating shaft (63) is sleeved in the second shaft sleeve (65), and second end covers (69) are provided at both ends of the first shaft sleeve (44); a second polytetrafluoroethylene sleeve (64) is also provided between the second rotating shaft (63) and the second shaft sleeve (65); a second anchor plate (67) is arranged on the second shaft sleeve (65) at intervals, and an anchor structure (8) is fixedly provided on the second anchor plate (67); a connecting plate (62) is also fixed on the top of the second rotating shaft (63), and a plane polytetrafluoroethylene plate (61) is provided in the groove at the top of the connecting plate (62), and the top surface of the plane polytetrafluoroethylene plate (61) slides relative to the stainless steel slide plate (60) at the bottom of the top steel plate (3).

4. The bridge longitudinal expansion and contraction device according to claim 3 is characterized in that: First pressing plates (43) are arranged on both sides of the top of the first shaft sleeve (44); second pressing plates (66) are arranged on both sides of the top of the second shaft sleeve (65).

5. The bridge longitudinal expansion and contraction device according to claim 3 is characterized in that: The outer surfaces of the first rotating shaft (46) and the second rotating shaft (63) are both provided with a chrome-plated layer.

6. The bridge longitudinal expansion and contraction device according to claim 3, characterized in that: The first shaft sleeve (44) and the second shaft sleeve (65) are both made of seamless steel pipes, and the first anchor plate (42) and the first shaft sleeve (44) as well as the second anchor plate (67) and the second shaft sleeve (65) are both connected by intermittent welding.

7. The bridge longitudinal expansion and contraction device according to claim 3 is characterized in that: The anti-warping structure (7) is an L-shaped limiting plate, and the connecting plate (62) is also an L-shaped structure that is relatively buckled with the L-shaped limiting plate.

8. The bridge longitudinal expansion and contraction device according to claim 1 is characterized in that: Edge protection angle irons (1) are also provided on the bridge deck concrete slabs (100) on both sides of the top steel plate (3).

9. The bridge longitudinal expansion and contraction device according to claim 8, characterized in that: A sealing rubber plate (2) is provided between the edge protection angle iron (1) and the top steel plate (3).

10. The bridge longitudinal expansion and contraction device according to claim 9, characterized in that: The anchoring structure (8) is an anchoring ring.

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