An integral bridge multi-stage abutment structure using a damper and a working method thereof

Abstract

The present invention relates to an integral bridge multi-stage abutment structure using a damper, comprising a main abutment and a secondary abutment arranged in sequence along the longitudinal bridge direction, a slope is formed by filling part of the soil between the main and secondary abutments, a concrete surface layer is laid on the slope, a damper is arranged between the concrete surface layer and the main abutment, the damper comprises an open arc steel plate and a supporting steel pipe, one end of the supporting steel pipe is fixed to the inner side of the open arc steel plate, and the other end is connected to an anti-buckling support steel sleeve, the length of the anti-buckling support steel sleeve is shorter than the opening length of the open arc steel plate, steel sleeves are arranged on the inner sides of two opposite openings of the open arc steel plate, the pipe diameter is larger than the elastic connectors at both ends of the anti-buckling support steel sleeve, the elastic connector is placed in the steel sleeve, and can slide freely in the steel sleeve. The structure is simple.

Description

Technical Field

[0001] The invention relates to an integral bridge multi-stage abutment structure using a damper and a working method thereof. Background Art

[0002] The seismic resistance of bridges has always been the focus of attention in the engineering and academic circles. Although the bridge design specifications of various countries have detailed seismic design methods and requirements, many bridges still fail and collapse in every earthquake. Although seamless bridges have better seismic resistance than jointed bridges, research on their seismic resistance is still a very important topic.

[0003] The structural characteristics of an integral bridge are that the upper and lower structures of the integral bridge are connected as a whole, there are no expansion joints and supports, and the abutments use flexible foundations; the longitudinal deformation of the upper structure is accommodated by the lower structure and foundation, which is the deformation characteristic of the integral bridge. The integral bridge has a high degree of redundancy, which can avoid the occurrence of beam fall during earthquakes and floods, and reduce or avoid the damage of wing walls and supports. In areas with high-intensity earthquakes, the integral bridge is undoubtedly a very suitable bridge type. However, despite this, there are still few research reports on how to perform seismic calculations on specific integral bridges, and they can only be handled using the general bridge seismic design method. The reason is that in the dynamic analysis of the integral bridge, there has always been a key problem that has not been well solved, that is, how to deal with the interaction between soil and structure, including the seismic effect between the abutments and the soil behind the abutments, the piles and the soil around the piles, and the possible seismic effect between the approach plate and the roadbed or the connecting road surface. At the abutment, the abutment deformation depends on the relative stiffness of the abutment, pile foundation and bridge deck, as well as the lateral stiffness of the soil behind the abutment and the soil on the side of the piles. Conversely, the response of the soil behind the abutment is related to the deformation of the abutment.

[0004] Because the substructure and superstructure of the integral bridge are connected as a whole, there are differences in the dynamic characteristics and seismic performance analysis compared with the traditional seam bridge. The advantages of the integral bridge, such as good integrity and high redundancy, also have certain disadvantages under earthquake action. After the main beam and abutment are connected as a whole, the structural stiffness increases, the period decreases, and the total seismic shear force is greater than that of the traditional seam bridge. Summary of the invention

[0005] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an integral bridge multi-stage abutment structure using a damper and a working method thereof.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: an integral bridge multi-level abutment structure using a damper, comprising a main abutment and a secondary abutment arranged in sequence along the longitudinal direction of the bridge, a slope is formed by filling part of the soil between the main and secondary abutments, a concrete surface layer is laid on the slope, a damper is arranged between the concrete surface layer and the main abutment, the damper comprises an open arc-shaped steel plate and a supporting steel pipe, one end of the supporting steel pipe is fixed to the inner side of the open arc-shaped steel plate, and the other end is connected to a buckling-resistant support steel sleeve, the length of the buckling-resistant support steel sleeve is shorter than the opening length of the open arc-shaped steel plate, steel casings are arranged on the inner sides of two opposite openings of the open arc-shaped steel plate, the pipe diameter is larger than the elastic connectors at both ends of the buckling-resistant support steel sleeve, the elastic connector is placed in the steel casing and can slide freely in the steel casing.

[0007] Preferably, one end of the damper is connected to the main abutment of the multi-level abutment structure of the integral bridge, and the other end is connected to the concrete surface layer.

[0008] Preferably, connecting plates connected to the main abutment and the concrete surface layer are fixedly provided on both sides of the open arc-shaped steel plate.

[0009] Preferably, the supporting steel pipe is radially arranged, the anti-buckling supporting steel sleeve is coaxial with the steel sleeve, and the anti-buckling supporting steel sleeve is perpendicular to the supporting steel pipe.

[0010] A working method for constructing an integral bridge multi-level abutment using a damper is carried out according to the following steps: the elastic connectors are steel plates at both ends of the core material of the anti-buckling support, and medium-low strength soft steel is used; the anti-buckling support used is an ordinary BRB anti-buckling support, and a combination of an open arc steel plate and the anti-buckling support is used, the open arc steel plate is only connected through an inner supporting steel pipe, and the steel plates at both ends of the anti-buckling support are located in steel sleeves provided on the inner sides of two opposite openings of the open arc steel plate, and can slide freely and only play a limiting role; when the damper is pulled, the anti-buckling support does not play a role, and only the open arc steel plate is pulled, and the force is relatively small; when the damper is compressed, the anti-buckling support plays a role and is subjected to a relatively large force.

[0011] Compared with the prior art, the present invention has the following beneficial effects: utilizing the good compressive performance of the buckling-resistance brace, a damper structure that is only compressed but not tensile is designed, which can be used between the main abutment and the backfill behind the abutment of the multi-level abutment structure of the integral bridge. It does not hinder the shrinkage effect when the temperature drops, but can also improve the deformation capacity of the integral bridge under earthquake action and improve its seismic performance.

[0012] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the structure of an embodiment of the present invention.

[0014] Figure 2 Schematic diagram of the damper structure. DETAILED DESCRIPTION

[0015] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description.

[0016] like Figure 1~2 As shown, an integral bridge multi-stage abutment structure using a damper comprises a main abutment 1 and a secondary abutment 2 arranged in sequence along the longitudinal direction of the bridge, wherein the secondary abutment serves as a retaining wall, a slope 4 is formed by filling part of the soil between the main and secondary abutments, a concrete surface layer 5 is laid on the slope, a damper 3 is arranged between the concrete surface layer and the main abutment, the damper comprises an open arc-shaped steel plate 7 and a supporting steel pipe 9, one end of the supporting steel pipe is fixed to the inner side of the open arc-shaped steel plate, and the other end is connected to an anti-buckling support steel sleeve 6, the length of the anti-buckling support steel sleeve is slightly shorter than the opening length of the open arc-shaped steel plate, steel sleeves are arranged on the inner sides of two opposite openings of the open arc-shaped steel plate, the pipe diameter is slightly larger than the elastic connectors 11 at both ends of the anti-buckling support steel sleeve, the elastic connector is placed in the steel sleeve 10, and can slide freely in the steel sleeve.

[0017] In the embodiment of the present invention, one end of the damper is connected to the main abutment of the multi-level abutment structure of the integral bridge, and the other end is connected to the concrete surface layer.

[0018] In the embodiment of the present invention, connecting plates 8 connected to the main abutment and the concrete surface layer are fixedly provided on both sides of the open arc-shaped steel plate.

[0019] In the embodiment of the present invention, the supporting steel pipe is radially arranged, the buckling-resisting supporting steel sleeve is coaxial with the steel sleeve, and the buckling-resisting supporting steel sleeve is perpendicular to the supporting steel pipe.

[0020] In the embodiment of the present invention, the buckling-restrained brace is an existing technology. Buckling-restrained brace (BRB), also known as unbonded brace, is a new type of steel structure support and also an energy-consuming support. The central part of the buckling-restrained brace is the core material, which generally uses medium- and low-strength soft steel. Under the action of axial force, the core material will produce a large plastic deformation to consume the energy input into the structure. At the same time, in order to prevent local and overall instability and enhance low-cycle fatigue performance, the core material is restrained by steel tube concrete or reinforced concrete on the outside and is covered with a buckling-resistance steel sleeve.

[0021] In the embodiment of the present invention, the elastic connector is the steel plates at both ends of the core material of the anti-buckling support, which are made of medium-low strength soft steel; the anti-buckling support used is an ordinary BRB anti-buckling support, which is a combination of an open arc steel plate and an anti-buckling support, and the open arc steel plate is only connected through the inner support steel pipe, and the steel plates at both ends of the anti-buckling support are located in the steel sleeves provided on the inner sides of the two opposite openings of the open arc steel plate, and can slide freely, and only play a limiting role. When the damper is pulled, the anti-buckling support does not work, and only the open arc steel plate is pulled, and the force is small; when the damper is compressed, the anti-buckling support works and is subjected to a large force.

[0022] A working method for constructing an integral bridge multi-level abutment using a damper is carried out according to the following steps: the elastic connectors are steel plates at both ends of the core material of the anti-buckling support, and medium-low strength soft steel is used; the anti-buckling support used is an ordinary BRB anti-buckling support, and a combination of an open arc steel plate and the anti-buckling support is used, the open arc steel plate is only connected through an inner supporting steel pipe, and the steel plates at both ends of the anti-buckling support are located in steel sleeves provided on the inner sides of two opposite openings of the open arc steel plate, and can slide freely and only play a limiting role; when the damper is pulled, the anti-buckling support does not play a role, and only the open arc steel plate is pulled, and the force is relatively small; when the damper is compressed, the anti-buckling support plays a role and is subjected to a relatively large force.

[0023] The present invention is not limited to the above-mentioned best implementation mode. Anyone can derive other various forms of integrated bridge multi-stage abutment structures using dampers and their working methods under the enlightenment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims

1. An integral bridge multi-stage abutment structure using a damper, characterized in that: It includes a main abutment and a secondary abutment arranged in sequence along the longitudinal bridge direction, a slope is formed by filling part of the soil between the main and secondary abutments, a concrete surface layer is laid on the slope, a damper is arranged between the concrete surface layer and the main abutment, the damper includes an open arc steel plate and a supporting steel pipe, one end of the supporting steel pipe is fixed to the inner side of the open arc steel plate, and the other end is connected to the anti-buckling support steel sleeve, the length of the anti-buckling support steel sleeve is shorter than the opening length of the open arc steel plate, steel casings are arranged on the inner sides of two opposite openings of the open arc steel plate, the pipe diameter is larger than the elastic connectors at both ends of the anti-buckling support steel sleeve, the elastic connector is placed in the steel casing and can slide freely in the steel casing; one end of the damper is connected to the main abutment of the multi-stage abutment structure of the integral bridge, and the other end is connected to the concrete surface layer; both sides of the open arc steel plate are fixed with connecting plates connected to the main abutment and the concrete surface layer; the supporting steel pipe is arranged radially, the anti-buckling support steel sleeve is coaxial with the steel sleeve, and the anti-buckling support steel sleeve is perpendicular to the supporting steel pipe.

2. A working method of the integral bridge multi-stage abutment structure using a damper as claimed in claim 1, characterized in that: Proceed in the following steps: the elastic connectors are steel plates at both ends of the core material of the anti-buckling support, and medium and low strength soft steel is used; the anti-buckling support used is an ordinary BRB anti-buckling support, which is a combination of an open arc steel plate and an anti-buckling support, and the open arc steel plate is only connected through the inner supporting steel pipe, and the steel plates at both ends of the anti-buckling support are located in steel casings provided on the inner sides of the two opposite openings of the open arc steel plate, and can slide freely, and only serve as a limit; when the damper is under tension, the anti-buckling support does not work, and only the open arc steel plate is under tension, and the force is small; when the damper is under compression, the anti-buckling support works and the force is large.

Images