A replaceable bridge shock-absorbing expansion joint

Abstract

The present invention relates to the technical field of bridges, and in particular to a new type of replaceable bridge shock-absorbing expansion joint, comprising an asphalt concrete pavement layer, a concrete pavement layer, a steel mesh, a threaded steel pipe, an anchor bolt, and a T-shaped steel plate arranged on a bridge deck, wherein the threaded steel pipe is arranged on the concrete pavement layer along a vertical direction, and the threaded steel pipe is arranged between the mesh holes of the steel mesh, presenting a hollow cylindrical structure with an open top, and passing through the outer end of the transverse plate of the T-shaped steel plate, and the opening is filled with a wooden plug; the inner end bottom of the transverse plate of the T-shaped steel plate is fixedly connected to a vertically arranged front plate through a second anchor bolt, a spring and soft steel are arranged between the front plate on one side and the longitudinal plate of the T-shaped steel plate, and a rubber water stop is arranged between the upper inner walls of the two front plates. The present invention realizes the rapid replacement of the expansion joint of the bridge after an earthquake through anchor bolts, and effectively reduces the impact of the expansion joint damage on the post-earthquake rescue.

Description

Technical Field

[0001] The invention relates to the technical field of bridges, and in particular to a replaceable bridge shock-absorbing expansion joint. Background Art

[0002] Bridge expansion joints refer to expansion joints that are usually set between the two beam ends, between the beam ends and the abutments, or at the hinged position of the bridge to meet the requirements of bridge deck deformation. The expansion joints are required to be able to freely expand and contract in both directions parallel and perpendicular to the bridge axis, be firm and reliable, and be smooth without sudden jumps and noise when vehicles pass through; they must be able to prevent rainwater and garbage and soil from infiltrating and blocking; and they must be easy and convenient to install, inspect, maintain, and remove dirt. At the expansion joints, the railings and the bridge deck pavement must be disconnected.

[0003] Under the action of earthquakes, the expansion joints of bridges are easily damaged, and often accompanied by damage to the bridge beams. This will not only cause economic losses, but also affect the role of bridges as transportation hubs in earthquake shelters and post-earthquake rescue, consume precious post-earthquake rescue time, and affect important events such as rescuing the wounded and post-disaster reconstruction.

[0004] After searching, it was found that most of the expansion joints of bridges with earthquake-resistant functions are based on comb-tooth expansion joints. Although the expansion joints can be replaced after an earthquake, their bolts often pass through complex internal structures, which makes it inconvenient to quickly replace the whole thing and cannot save precious rescue time after an earthquake. Although they use cavities or polytetrafluoroethylene to expand the range of displacement during an earthquake, there is no energy-absorbing and shock-absorbing device inside, and the earthquake-resistant effect is not ideal, and there is still damage to bridges and abutments. In addition, they cannot directly replace rubber waterstops, which will limit the life of the expansion joints and affect the durability of the bridges. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a replaceable bridge shock-absorbing expansion joint. Through the action between T-shaped steel plates and the mobility of the rotating shaft, the spring and the soft steel of the bridge are deformed during an earthquake, which plays a role in energy dissipation and shock reduction, thereby reducing the damage to the bridge beam caused by the earthquake. The present invention also extends the life of the expansion joint by setting anchor bolts and replacing waterstops, thereby increasing its durability to a certain extent; through the setting of anchor bolts and threaded steel pipes, the purpose of quickly replacing the overall expansion joint after an earthquake and restoring traffic can be achieved, which has a positive effect on earthquake refuge and post-earthquake rescue.

[0006] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0007] The present invention discloses a replaceable bridge shock-absorbing expansion joint, comprising an asphalt concrete pavement layer arranged on a bridge deck, a concrete pavement layer, a steel mesh arranged in the concrete pavement layer, a threaded steel pipe arranged in the concrete pavement layer and a first anchor bolt, a T-shaped steel plate and a transverse steel plate arranged on the concrete pavement layer, a second anchor bolt and a front plate; the threaded steel pipe is arranged on the concrete pavement layer along a vertical direction, the threaded steel pipe is arranged between the mesh holes of the steel mesh, and is in a hollow cylindrical structure with an open top, and the inner wall of the threaded steel pipe is provided with ... An internal thread that matches the external thread on an anchor bolt; the inner ends of the T-shaped steel plate and the transverse steel plate are provided with a first countersunk through hole for connecting and fixing with a first anchor bolt; the front plate is arranged at the bottom of the outer ends of the T-shaped steel plate and the transverse steel plate, and the top of the outer ends of the T-shaped steel plate and the transverse steel plate are provided with a second countersunk through hole for inserting a second anchor bolt, and the top of the front plate is provided with a threaded hole that matches the external thread on the second anchor bolt; a spring and soft steel are provided between the front plate and the longitudinal plate of the T-shaped steel plate; a rubber waterstop is provided between the two front plates.

[0008] An angle steel is arranged between the longitudinal plate and the transverse plate of the T-shaped steel plate; an angle steel is arranged between the transverse steel plate and the front plate.

[0009] A rotating shaft for hinged connection between the front end and the rear end of the T-shaped steel plate is arranged on the transverse plate of the T-shaped steel plate.

[0010] The inner ends of the T-shaped steel plate and the transverse steel plate are provided with second countersunk through holes for connection and fixation with the first anchor bolts.

[0011] The top openings of the first countersunk through hole and the second countersunk through hole are filled with a first wooden plug and a second wooden plug respectively.

[0012] The spring and the mild steel are welded between the T-shaped steel plate and the front plate at intervals, and the mild steel is roughly in a "Y"-shaped structure.

[0013] The length of the rubber water stop is greater than the width between the front plates; and both ends of the rubber water stop are respectively fixed to the second anchor bolts.

[0014] A rubber gasket is provided at the bottom of the first countersunk through hole.

[0015] The beneficial effects of the present invention are:

[0016] The present invention arranges the T-shaped steel plate so that under normal use, the second anchor bolts stably connect the T-shaped steel plate and the front plate; under the action of an earthquake, due to the action between the T-shaped steel plates, the second anchor bolts break, the spring and the soft steel deform, and the effect of energy dissipation and shock reduction is achieved.

[0017] The present invention establishes a buffer between the bridge and the abutment by uniformly arranging springs and soft steel, which can absorb the energy brought by the earthquake, thereby effectively avoiding damage to the bridge and the abutment and ensuring the normal use of the bridge for shelter during earthquakes and post-earthquake rescue.

[0018] The present invention realizes that only the waterstop strip needs to be replaced under normal use through the provision of the second anchor bolt, effectively extending the service life of the expansion joint, thereby extending the durability of the bridge, improving the convenience of replacement and work efficiency, and effectively reducing the losses caused by replacing the expansion joint.

[0019] The present invention realizes the replacement of the entire expansion joint after an earthquake by arranging the first anchor bolt and the threaded steel pipe, which can effectively improve the recovery efficiency of bridge traffic after an earthquake, thereby improving the efficiency of evacuation during an earthquake and rescue after an earthquake.

[0020] The present invention has good applicability to bridges of different bridge types and seismic fortification levels, and can meet the seismic design requirements of different projects by adjusting the shape and size of the T-shaped steel plate, the number and density of springs and soft steel, and corresponding bolts and other parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a longitudinal cross-sectional view of the present invention;

[0022] Figure 2 is a transverse cross-sectional view of the present invention;

[0023] Figure 3 is a plan view of the present invention;

[0024] Figure 4 It is the construction drawing of the threaded steel pipe of the present invention.

[0025] In the figure: asphalt concrete pavement layer 1, concrete pavement layer 2, steel mesh 3, threaded steel pipe 4, first anchor bolt 5, second anchor bolt 51, T-shaped steel plate 6, transverse steel plate 61, front plate 7, angle steel 8, rotating shaft 9, spring 10, mild steel 11, rubber waterstop 12, first wooden plug 13, second wooden plug 131, rubber gasket 14. DETAILED DESCRIPTION

[0026] The present invention is further described below:

[0027] See also Figure 1-4 ,

[0028] The present invention discloses a replaceable bridge shock-absorbing expansion joint, comprising an asphalt concrete pavement layer 1 arranged on a bridge deck, a concrete pavement layer 2, a steel mesh 3 arranged in the concrete pavement layer 2, a threaded steel pipe 4 and a first anchor bolt 5 arranged in the concrete pavement layer 2, a T-shaped steel plate 6 and a transverse steel plate 61 arranged on the concrete pavement layer 2, a second anchor bolt 51 and a front plate; the threaded steel pipe 4 is arranged on the concrete pavement layer 2 along a vertical direction, the threaded steel pipe 4 is arranged between the mesh holes of the steel mesh 3, and is in a hollow cylindrical structure with an open top, and its inner wall is provided with ... and a second anchor bolt 51 and a front plate; 5; the inner ends of the T-shaped steel plate 6 and the transverse steel plate 61 are provided with a first countersunk through hole for connecting and fixing with a first anchor bolt 5; the front plate 7 is arranged at the bottom of the outer ends of the T-shaped steel plate 6 and the transverse steel plate 61, and the top of the outer ends of the T-shaped steel plate 6 and the transverse steel plate 61 are provided with a second countersunk through hole for inserting a second anchor bolt 51, and the top of the front plate 7 is provided with a threaded hole matching the external thread on the second anchor bolt 51; a spring 10 and a soft steel 11 are provided between the front plate 7 and the longitudinal plate of the T-shaped steel plate 6; a rubber waterstop 12 is provided between the two front plates 7.

[0029] An angle steel 8 is provided between the longitudinal plate and the transverse plate of the T-shaped steel plate 6 ; an angle steel 8 is provided between the transverse steel plate 61 and the front plate 7 .

[0030] A rotating shaft 9 for hinged connection between the front end and the rear end of the T-shaped steel plate 6 is disposed on the transverse plate of the T-shaped steel plate 6 .

[0031] The inner ends of the T-shaped steel plate 6 and the transverse steel plate 61 are provided with second countersunk through holes for connection and fixing with the first anchor bolts 5 .

[0032] The top openings of the first countersunk through hole and the second countersunk through hole are filled with a first wooden plug 13 and a second wooden plug 131 respectively.

[0033] The spring 10 and the mild steel 11 are welded between the T-shaped steel plate 6 and the front plate 7 at intervals, and the mild steel 11 is roughly in a "Y"-shaped structure.

[0034] The length of the rubber water stop 12 is greater than the width between the front plates 7 ; both ends of the rubber water stop 12 are respectively fixed to the second anchor bolts 51 .

[0035] A rubber gasket 14 is provided at the bottom of the first countersunk through hole.

[0036] Installation process: first, position and place the threaded steel pipe 4 in the mesh of the steel mesh 3. To prevent the threaded steel pipe 4 from being blocked when pouring concrete, the threaded steel pipe 4 should be filled with foam materials in advance before the concrete pavement layer 2 is constructed; after the concrete pouring reaches a certain strength, a layer of geotextile is laid in the expansion joint groove of the bridge and then the asphalt concrete pavement layer 1 of the entire bridge is laid; after the asphalt concrete pavement layer 1 is formed and reaches strength, the asphalt concrete of the expansion joint groove is cut out according to the reserved size, the geotextile is removed, and the foam in the threaded steel pipe 4 is cleaned before entering the laying stage; the transverse steel plate 61 and the welded front plate 7, T-shaped steel plate 6, spring 10, and mild steel 11 are laid as a whole on the upper part of the concrete pavement layer 2, and the angle steel 8, rubber water stop 12, second anchor bolt 51, and first anchor bolt 5 are installed in sequence to achieve fixation, and the first wooden plug 13 on the upper part of the first anchor bolt 5 and the second wooden plug 131 on the upper part of the second anchor bolt 51 are installed to achieve dustproof, and the installation is completed. In summary, the first installation process is simple to operate, clear in concept, and easy to implement. When it is necessary to disassemble and replace the rubber waterstop 12, it is only necessary to remove the second anchor bolt 51, and then replace the rubber waterstop 12. After the replacement is completed, tighten the second anchor bolt 51 again to achieve the replacement of the rubber waterstop 12. It is convenient and simple, reduces the loss caused by maintenance, and improves the replacement efficiency. During an earthquake, when a collision occurs between the beam body and the abutment, the impact between the T-shaped steel plates causes the second anchor bolt 51 to break, and the expansion joint is transformed into a compressible state. The deformation of the spring 10 and the soft steel 11 is used to dissipate energy and reduce shock, avoiding damage to the bridge and the abutment, which is of decisive significance to whether the bridge can be used for refuge during an earthquake and post-earthquake rescue. After an earthquake, by disassembling the first anchor bolt 5, the entire expansion joint can be quickly replaced, which plays an important role in refuge during an earthquake and post-earthquake rescue.

[0037] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings or directly or indirectly applied in related technical fields are also included in the patent protection scope of the present invention.

Claims

1. A replaceable bridge shock-absorbing expansion joint, characterized in that: The invention comprises an asphalt concrete pavement layer (1) arranged on a bridge deck, a concrete pavement layer (2), a steel mesh (3) arranged in the concrete pavement layer (2), a threaded steel pipe (4) and a first anchor bolt (5) arranged in the concrete pavement layer (2), a T-shaped steel plate (6) and a transverse steel plate (61) arranged on the concrete pavement layer (2), a second anchor bolt (51) and a front plate; the threaded steel pipe (4) is arranged on the concrete pavement layer (2) along a vertical direction, the threaded steel pipe (4) is arranged between the meshes of the steel mesh (3), and is in the shape of a hollow cylinder with an opening at the top, and the inner wall of the structure is provided with an internal thread matching the external thread on the first anchor bolt (5); the T-shaped steel plate (6) and the transverse steel plate The inner end of the T-shaped steel plate (61) is provided with a first countersunk through hole for connecting and fixing with a first anchor bolt (5); the front plate (7) is arranged at the bottom of the outer ends of the T-shaped steel plate (6) and the transverse steel plate (61); the outer ends of the T-shaped steel plate (6) and the transverse steel plate (61) are provided with a second countersunk through hole for inserting a second anchor bolt (51); the top of the front plate (7) is provided with a threaded hole matching the external thread on the second anchor bolt (51); a spring (10) and a soft steel (11) are provided between the front plate (7) and the longitudinal plate of the T-shaped steel plate (6); a rubber water stop strip (12) is provided between the two front plates (7); and a rotating shaft (9) for hinged connection between the front end and the rear end of the T-shaped steel plate (6) is provided on the transverse plate.

2. A replaceable bridge shock-absorbing expansion joint according to claim 1, characterized in that: The inner ends of the T-shaped steel plate (6) and the transverse steel plate (61) are provided with second countersunk through holes for connection and fixing with the first anchor bolts (5).

3. A replaceable bridge shock-absorbing expansion joint according to claim 2, characterized in that: The top openings of the first countersunk through hole and the second countersunk through hole are filled with a first wooden plug (13) and a second wooden plug (131) respectively.

4. A replaceable bridge shock-absorbing expansion joint according to claim 3, characterized in that: The spring (10) and the soft steel (11) are welded at intervals between the T-shaped steel plate (6) and the front plate (7), and the soft steel (11) is generally in a "Y"-shaped structure.

5. A replaceable bridge shock-absorbing expansion joint according to claim 4, characterized in that: The length of the rubber water stop (12) is greater than the width between the front plates (7); and both ends of the rubber water stop (12) are respectively fixed to the second anchor bolts (51).

6. A replaceable bridge shock-absorbing expansion joint according to claim 5, characterized in that: A rubber gasket (14) is provided at the bottom of the first countersunk through hole.

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