Bridge expansion device suitable for crossing seismic fault

Abstract

The utility model relates to a bridge expansion device suitable for crossing an earthquake fault, which comprises a transverse displacement device, and the transverse displacement device comprises a fixed seat fixedly arranged on a beam body and a movable toothed plate which is arranged on the fixed seat and is in sliding connection with the fixed seat. The fixed seat is connected with the movable toothed plate through a vertically extending shear-resistant anchor bolt, a strip-shaped hole which extends transversely and is used for limiting transverse slippage of the shear-resistant anchor bolt is vertically formed in the fixed seat in a penetrating mode, a fixed plate is fixedly connected to the movable toothed plate, and a plurality of movable comb teeth are arranged on the fixed plate at intervals in the transverse extending direction of the fixed plate. The bridge expansion device suitable for crossing the seismic fault has the advantages that the bridge expansion device is simple in structure, severe damages such as shear failure and fracture of a bridge can be prevented when the maximum displacement position of a bridge floor deforms, and the bridge expansion device is suitable for crossing the seismic fault. And the shock resistance of the bridge is improved.

Description

Technical Field

[0001] The utility model relates to a bridge expansion device suitable for crossing an earthquake fault. Background Art

[0002] Due to the strong directional effect and slip effect of active faults under earthquakes, bridges across faults often suffer serious damage. Therefore, relevant domestic and foreign specifications give suggestions for avoiding faults. However, due to the limitations of terrain, line selection, cost and other conditions, some bridges have to cross active faults. Fault displacement will cause large lateral displacement between piers and beams, and large shear deformation or even fracture in the span of the main beam. Therefore, it is urgent to propose a device that can protect the maximum displacement of the bridge deck when deformation occurs to ensure that the bridge does not suffer shear damage and other serious damage such as fracture.

[0003] Compared with conventional seismic excitation, bridge structures under cross-fault seismic motion have more complex dynamic responses, greater seismic demands, and more severe seismic damage. The relative displacement of the fault causes different ground motions at the supports on both sides of the fault for cross-fault bridges. At the same time, the relative displacement of the fault also produces permanent displacement of the surface rupture. The internal force and displacement response of the bridge are not only affected by the different ground motions on both sides of the fault, but also by the permanent displacement of the surface rupture of the fault. This is also a significant difference between cross-fault bridges and other bridges under earthquake action. At the same time, the contradiction between the provisions of the highway and railway seismic codes for avoiding faults and the actual situation where bridges cannot be avoided is becoming increasingly prominent. Therefore, it is urgent to propose a device to solve the lateral displacement of cross-fault bridges to protect the safety of bridge structures.

[0004] In order to meet the needs of bridge beam deformation, bridge expansion joint devices are generally installed between the two beam ends of the bridge, between the beam end and the abutment, or at the hinged position of the bridge. At present, many existing bridge expansion joint devices generally have three-way displacement functions of longitudinal displacement, longitudinal rotation, and horizontal rotation, which can meet the requirements of most bridges for bridge expansion joint devices. However, some large bridges are affected by the environment, strong winds, ocean currents, tides, and especially cross-fault earthquakes during use. In addition to longitudinal displacement, longitudinal rotation, and horizontal rotation, they also produce significant lateral displacement. Although the prior art also discloses bridge expansion joint devices with longitudinal displacement, lateral displacement, longitudinal rotation, and horizontal rotation, the lateral displacement of the existing expansion joint devices is very small, which cannot meet the requirements of the huge shear displacement generated by the bridge deck during a cross-fault earthquake, and will cause shear damage to the bridge deck and even the risk of falling beams. In summary, further improvements need to be made to the existing bridge expansion joint devices.

[0005] At present, in the field of bridge expansion devices, there is a type of product called "finger-shaped joints", which are also called "comb-tooth plate joints" in the industry in my country. In addition to meeting the longitudinal movement requirements of bridges, the main advantages of "finger-shaped joints" over modular steel expansion joints of the same level are: they are suitable for installation on bridge structures with shallow notches, and vehicles pass through them with lower noise and smoother passage. However, the existing comb-tooth type expansion joint devices are difficult to achieve large lateral displacements, and generally can only meet 3-5 mm lateral displacements, and are not suitable for large lateral shear deformations of bridges across faults.

[0006] The current solution has the following disadvantages:

[0007] 1: The traditional comb-tooth expansion joint device has poor lateral seismic resistance and is difficult to meet the large lateral deformation requirements of bridges under cross-fault earthquakes.

[0008] For extra-large bridges such as suspension bridges and cable-stayed bridges, the beams will not only move longitudinally and rotate vertically under the influence of vehicle loads and temperature, but also move laterally and undergo other displacements under the influence of other factors such as earthquakes. However, the existing comb-tooth telescopic devices are difficult to achieve large lateral displacements and can generally only meet 3-5 mm lateral displacements. They are not suitable for cross-fault bridges that will produce large lateral deformations.

[0009] 2: The traditional comb-tooth expansion joint device cannot achieve lateral dislocation movement.

[0010] The general comb-tooth expansion joint is not suitable for the case of a bridge across a fault. Its longitudinal expansion function can meet the expansion and contraction needs of the bridge beam, but when an earthquake occurs, especially an earthquake across a fault, the bridge beam will produce a lateral displacement movement. However, the existing expansion joint can only move in the longitudinal direction (along the bridge direction), which is difficult to meet the needs of this lateral displacement movement.

[0011] 3: The traditional comb-tooth expansion joint device is prone to getting stuck during lateral movement, causing damage to the expansion joint device and the bridge structure.

[0012] The most commonly used expansion joint devices for existing bridges are comb-tooth type. When the bridge is laterally displaced, the movable comb teeth are easily stuck and rigidly damaged. Especially when a cross-fault earthquake occurs, the relative displacement of the fault also produces permanent displacement of the surface rupture, and lateral dislocation movement will occur between the bridge beams. Since the two adjacent movable comb plates are in rigid contact, it is easy to cause the risk of breaking and damage of the supporting beams and movable comb plates due to the large rigid pulling force, and also restrict the lateral movement between the beams, which cannot meet the use requirements. Utility Model Content

[0013] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a bridge expansion device suitable for crossing earthquake faults, which solves the problem of shear damage to the bridge deck of the bridge crossing the fault and protects the expansion joint from being damaged.

[0014] In order to solve the above technical problems, the technical solution of the utility model is: a bridge expansion and contraction device suitable for crossing earthquake faults, including a lateral displacement device, the lateral displacement device including a fixed seat fixed on the beam body and a movable tooth plate placed on the fixed seat and slidably connected to the fixed seat, the fixed seat and the movable tooth plate are connected through vertically extending shear anchor bolts, the fixed seat is vertically penetrated by a strip hole extending laterally for the lateral sliding limit of the shear anchor bolts, the movable tooth plate is fixedly connected to a fixed plate, and the fixed plate is provided with a plurality of movable comb teeth at intervals along its lateral extension direction, one end of the movable comb teeth is rotatably connected to the fixed plate, and the other end is staggered and plugged with the movable comb teeth of the lateral displacement device on the adjacent beam body.

[0015] Furthermore, polytetrafluoroethylene gaskets are provided between the fixed seat and the movable tooth plate, and between the fixed plate and the movable comb teeth.

[0016] Furthermore, the movable tooth plate is provided with a circular hole for the shear anchor bolt to pass through.

[0017] Furthermore, two groups of strip holes are longitudinally spaced apart on the fixing seat, and four round holes are arranged in a square array on the movable tooth plate. Every two round holes correspond to a group of strip holes, and the two round holes correspond to the horizontal three equal parts of the strip holes.

[0018] Furthermore, the fixed plate and the longitudinal outer ends of the movable tooth plate are welded as a whole, and the movable comb teeth are hinged on the fixed plate via vertical pins.

[0019] Furthermore, the ends of the beam body are provided with installation grooves for placing the lateral displacement device, the bottom of the fixing seat and the top of the movable tooth plate are provided with fastening grooves, and both ends of the shear anchor bolts are fastened in the fastening grooves via high-strength nuts.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] Advantages 1. This device can achieve a maximum displacement of 1 / 3 of the bridge deck width, and the displacement reaches the meter level.

[0022] Compared with the traditional railway bridge beam end lateral displacement coordination device and bridge lateral displacement device, this device has the obvious characteristic of large lateral displacement. Since the waist-shaped through hole on the lateral displacement device is almost as wide as the entire bridge width, and the round hole is set at the third part of the strip hole, the maximum lateral displacement can reach 1 / 3 of the bridge beam width, which can meet the situation of permanent displacement of surface rupture under the cross-slip fault earthquake.

[0023] Advantage 2. This device can realize normal traffic on the bridge deck under normal working conditions, and can realize autonomous dislocation displacement of the bridge deck under earthquake conditions.

[0024] The comb-tooth expansion joint can undergo synchronous transverse deformation with the beam body, and the movable tooth plate is driven to move by the movement of the shear anchor bolts. A polytetrafluoroethylene pad is provided on the connecting surface of the movable tooth plate and the fixed seat, which greatly reduces the friction of the sliding surface, thereby easily realizing the displacement between the overall expansion joint structure and the beam body and ensuring the safety of the bridge.

[0025] Advantage 3. The deformation joint comb teeth in this device overcome the previous characteristics of large longitudinal rigidity resulting in inability to deform horizontally.

[0026] The beam body undergoes shear deformation under the influence of the permanent surface deformation caused by the cross-fault earthquake, driving the movable tooth plate to move laterally, and the movable comb teeth can rotate in the plane under the action of mutual dislocation force, thereby realizing the lateral deformation of the expansion joint.

[0027] Advantage 4. This device can overcome the disadvantage of the traditional comb-tooth type expansion joint being stuck due to lateral deformation.

[0028] The comb teeth on the two movable tooth plates are designed as pointer-type movable comb teeth that can rotate horizontally. When the left and right beams are relatively displaced laterally, it can effectively avoid the rigid damage to the entire bridge beam and piers caused by the lateral jamming of ordinary comb-tooth expansion joints during earthquake displacement, thereby improving the seismic resistance of the bridge.

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0031] Figure 2 It is a lateral side view of the lateral displacement device in the embodiment of the utility model;

[0032] Figure 3 It is a schematic diagram of the working deformation state in the embodiment of the utility model.

[0033] In the figure: 1-first beam body, 2-second beam body, 3-fixed seat, 4-movable tooth plate, 5-shear anchor bolt, 6-strip hole, 7-fixed plate, 8-movable comb teeth, 9-polytetrafluoroethylene gasket, 10-round hole, 11-pin, 12-installation slot, 13-fastening slot, 14-high-strength nut. DETAILED DESCRIPTION

[0034] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below with reference to the accompanying drawings for detailed description as follows.

[0035] like Figures 1 to 3 As shown, taking two beams as an example, namely a first beam 1 and a second beam 2, a bridge expansion device suitable for crossing an earthquake fault includes a lateral displacement device, the lateral displacement device includes a fixed seat 3 fixedly mounted on the beam (the first beam) and a movable tooth plate 4 placed on the fixed seat and slidably connected to the fixed seat, the fixed seat and the movable tooth plate are connected through a vertically extending shear anchor bolt 5, a strip hole 6 extending laterally for the lateral sliding limit of the shear anchor bolt is vertically penetrated on the fixed seat, a fixed plate 7 is fixedly connected to the movable tooth plate, and a plurality of movable comb teeth 8 are arranged at intervals along the lateral extension direction of the fixed plate, and the intervals between the movable comb teeth serve as the longitudinal sliding space of the movable comb teeth of another lateral displacement device, one end of the movable comb tooth is rotatably connected to the fixed plate, and the other end is staggered and plugged with the movable comb teeth of the lateral displacement device on the adjacent beam (the second beam), which is equivalent to a normal comb tooth type expansion joint under normal working conditions, meeting the normal use function of the bridge.

[0036] In the embodiment of the utility model, polytetrafluoroethylene gaskets 9 are provided between the fixed seat and the movable tooth plate, and between the fixed plate and the movable comb teeth, so as to reduce friction and facilitate lateral deformation of the movable tooth plate.

[0037] In the embodiment of the utility model, the movable tooth plate is provided with a circular hole 10 for the shear anchor bolt to pass through.

[0038] In an embodiment of the utility model, two groups of strip holes are longitudinally spaced apart on the fixing seat, and four round holes are arranged in a square array on the movable tooth plate. Every two round holes correspond to a group of strip holes, and the two round holes correspond to the horizontal three equal parts of the strip holes.

[0039] In the embodiment of the utility model, the fixed plate and the longitudinal outer end of the movable tooth plate are welded as a whole, and the movable comb teeth are hinged on the fixed plate via vertical pins 11.

[0040] In the embodiment of the utility model, the ends of the beam body are provided with installation grooves 12 for placing the lateral displacement device, the bottom of the fixing seat and the top of the movable tooth plate are provided with fastening grooves 13, and the two ends of the shear anchor bolts are fastened in the fastening grooves through high-strength nuts 14.

[0041] In the embodiment of the utility model, under the action of a cross-fault earthquake, when relative lateral displacement occurs between the two movable tooth plates, the movable comb teeth can rotate horizontally to avoid the comb teeth from getting stuck with each other, thereby protecting the expansion joint comb teeth and the left and right beams from damage.

[0042] Under normal working conditions, there is no lateral displacement of the beams at both ends. The device adopts a comb-type expansion joint with two movable comb plates, which has a large longitudinal expansion and contraction amount, and the vehicle runs smoothly and comfortably.

[0043] When a cross-fault earthquake occurs, the fixed seat fixed on the beam will undergo lateral displacement with the beam body. At this time, the movable tooth plate that moves longitudinally with the beam body can make corresponding lateral displacement in the through-type strip hole on the fixed seat through the laterally displaceable anchor bolts.

[0044] At the same time, the movable comb teeth on the two movable tooth plates are hinged and fixed, so they can rotate horizontally with the lateral movement of the movable tooth plates, which can avoid the phenomenon of jamming between the comb teeth and can independently realize the displacement of the bridge deck under cross-fault earthquake conditions. Protect the bridge deck from shear damage caused by permanent displacement of the surface across the fault, which is convenient for the later rescue and maintenance of the bridge.

[0045] The utility model is not limited to the above-mentioned best implementation mode. Anyone can derive other various forms of bridge expansion devices suitable for crossing earthquake faults under the inspiration of the utility model. All equivalent changes and modifications made according to the scope of the patent application of the utility model shall fall within the scope of the utility model.

Claims

1. A bridge expansion device suitable for crossing an earthquake fault, comprising a lateral displacement device, characterized in that: The lateral displacement device includes a fixed seat fixed on the beam body and a movable tooth plate placed on the fixed seat and slidably connected to the fixed seat. The fixed seat and the movable tooth plate are connected via vertically extending shear anchor bolts. A strip hole extending laterally for the shear anchor bolt to limit lateral sliding is vertically penetrated on the fixed seat. A fixed plate is fixedly connected to the movable tooth plate. The fixed plate is provided with a plurality of movable comb teeth at intervals along its lateral extension direction. One end of the movable comb teeth is rotatably connected to the fixed plate, and the other end is staggered and plugged into the movable comb teeth of the lateral displacement device on the adjacent beam body.

2. A bridge expansion and contraction device suitable for crossing an earthquake fault according to claim 1, characterized in that: Polytetrafluoroethylene gaskets are arranged between the fixed seat and the movable tooth plate, and between the fixed plate and the movable comb teeth.

3. The bridge expansion device suitable for crossing an earthquake fault according to claim 1, characterized in that: The movable tooth plate is provided with a circular hole for the shear-resistant anchor bolt to pass through.

4. The bridge expansion device suitable for crossing an earthquake fault according to claim 3, characterized in that: The fixing seat is provided with two groups of strip holes at intervals in the longitudinal direction, and the movable tooth plate is provided with four round holes in a square array, and every two round holes correspond to a group of strip holes.

5. The bridge expansion device suitable for crossing an earthquake fault according to claim 1, characterized in that: The fixed plate and the longitudinal outer ends of the movable tooth plate are welded as a whole, and the movable comb teeth are hinged on the fixed plate via vertical pins.

6. The bridge expansion device suitable for crossing an earthquake fault according to claim 1, characterized in that: The ends of the beam body are provided with installation grooves for placing the lateral displacement device, the bottom of the fixing seat and the top of the movable tooth plate are provided with fastening grooves, and the two ends of the shear anchor bolts are fastened in the fastening grooves via high-strength nuts.

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