Bridge seismic mitigation and isolation device and installation method thereof

Abstract

The invention discloses a bridge seismic mitigation and isolation device and a mounting method thereof. An existing friction pendulum support and an existing viscous damper are high in investment. The bridge comprises a beam body, a bridge pier, a high-strength steel bar, a stainless steel plate, a wear-resistant steel plate, non-shrinkage mortar and a high-density polyethylene sleeve, a limiting concrete block is specially designed on a pier top cap, a drainage hole and a high-density polyethylene sleeve are reserved in the middle of the limiting concrete block, the high-density polyethylene sleeve is arranged at the position, corresponding to the limiting concrete block, of a beam body section partition wall, a high-strength steel bar is embedded into the limiting concrete and the sleeve of a beam body, and the high-strength steel bar is anchored; and energy is consumed through relative displacement of the limiting concrete block, the stainless steel plate and the wear-resistant steel plate. The structure is simple, construction is convenient, and the safety of the bridge structure can be effectively protected.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge seismic reduction and isolation, and particularly relates to a bridge seismic reduction and isolation device and an installation method thereof. Background Art

[0002] The seismic isolation technology of bridges mainly uses scientific and reasonable design measures to enable the structural system to achieve a certain degree of seismic isolation or shock absorption, so as to ensure that the structure has good seismic performance. According to the basic laws of the structural system's response to earthquakes, the specific working principles of bridge seismic isolation technology can be summarized into three points:

[0003] (1) Extend the natural vibration period of the structure

[0004] The purpose of extending the structural period is achieved by designing a flexible support structure in the structure, which reduces the acceleration response of the structure and thus weakens the seismic response under the action of an earthquake.

[0005] (2) Reduce structural displacement

[0006] The extension of the natural vibration period of the structure will inevitably cause the displacement of the structure to increase. In order to reduce this part of the increased structural displacement, some damper-type energy dissipation elements can be applied in the structural design in a scientific and reasonable way. When an earthquake occurs, as the stress and deformation of the structure increase, the damper quickly enters the plastic state from the original elastic state and generates damping to consume the energy of the earthquake, thereby increasing the energy dissipation capacity and damping value of the structure.

[0007] (3) Reasonable stiffness value design

[0008] When designing the flexible support structure, the rationality of the stiffness of the bridge structure under normal use loads should be ensured. Special spacers can be added to the bridge structure design to support the entire bridge structure.

[0009] In recent years, the seismic isolation technology of bridges has developed rapidly. The seismic isolation methods currently used are mainly friction pendulum bearings and viscous dampers. Compared with other bearings, friction pendulum bearings have high bearing capacity and good seismic isolation effect. They have been increasingly widely used in large-span bridges. They have both shock absorption and seismic isolation functions. Viscous dampers are made based on the principle of fluid movement, especially when fluids pass through throttling holes. They are a type of damper related to the speed of piston movement. When an earthquake occurs, it converts mechanical energy into heat energy and dissipates it through internal interactions, including the interaction between the damping medium and the piston, the interaction between the damping medium and the cylinder, the interaction between the media, and the interaction between the piston rod and the seal, thereby greatly weakening the energy of the earthquake. Summary of the invention

[0010] In order to make up for the deficiencies of the prior art, the present invention provides a bridge seismic isolation device and an installation method thereof, which solves the problem of high investment in existing friction pendulum bearings and viscous dampers.

[0011] In order to achieve the above object, the technical solution adopted by the present invention is:

[0012] A bridge seismic isolation device, characterized in that: a limit concrete block is arranged on the top cap of the bridge pier, and the limit concrete block is located between the fixed support end and the movable support end; a steel rod hole is reserved in the limit concrete block;

[0013] Apply non-shrinkage mortar to the longitudinal position of the beam end and the groove of the beam body where the fixed support is installed;

[0014] A reserved steel rod is arranged in the reserved steel rod channel of the limiting concrete block, and the reserved steel rod passes through the partition wall of the fixed end beam section.

[0015] Furthermore, the limiting concrete blocks and the bridge piers are made of the same grade of concrete.

[0016] Furthermore, drainage pipe holes are reserved in the limiting concrete blocks to facilitate the installation of drainage pipes at a later stage.

[0017] Furthermore, wear-resistant steel plates and stainless steel plates are installed on the surface of the non-shrinkage mortar.

[0018] Furthermore, a type 2 elastic support pad is installed in the groove of the fixed end.

[0019] Furthermore, a type 1 elastic support pad is installed at the movable end.

[0020] Furthermore, a high-density polyethylene sleeve is provided outside the reserved steel rod located in the partition wall of the fixed end beam section.

[0021] Furthermore, the diameter of the high-strength steel rod is 60 mm and the diameter of the drainage hole is 200 mm.

[0022] Furthermore, the wear-resistant steel plate has a thickness of 12 mm and the stainless steel plate has a thickness of 10 mm.

[0023] A method for installing a bridge seismic isolation device comprises the following steps:

[0024] Step 1: The limiting concrete blocks and the bridge piers are made of the same grade of concrete and are poured together during the construction of the bridge piers;

[0025] Step 2: Space must be reserved at the end of the fixed end beam to ensure that the limiting concrete block can be embedded in it;

[0026] Step 3: Holes must be reserved in the limiting concrete blocks to facilitate the later installation of high-strength steel rods and drainage pipes;

[0027] Step 4: Install high-density polyethylene sleeves and high-strength steel rods at the positions corresponding to the fixed end beam segment partition walls and the limiting concrete blocks.

[0028] Beneficial effects of the present invention:

[0029] 1) This device can reduce the seismic response of the bridge by extending the structural period;

[0030] 2) This device can make targeted adjustments to the bridge structure, arrange it reasonably, and maximize the seismic effect of the bridge piers;

[0031] 3) This device can effectively prevent the beam from falling off during an earthquake by connecting the pier top limit concrete block with the beam.

[0032] 4) The device can dissipate energy through the relative displacement between the limiting concrete block and the wear-resistant steel plate, thereby reducing the risk of beam damage.

[0033] 5) The device is easy to install and its application is highly cost-effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural plan view of the bridge seismic isolation device of the present invention.

[0035] Figure 2 It is a cross-sectional view of the fixed end 2 type elastic support pad of the present invention;

[0036] Figure 3 It is a cross-sectional view of the anchoring position of the fixed end bolt of the present invention;

[0037] Figure 4 It is a cross-sectional view of the movable end 1 type elastic support pad of the present invention;

[0038] Figure 5 It is a longitudinal cross-sectional view of the high-strength steel rod of the present invention. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with specific implementation modes.

[0040] like Figure 1-5 As shown, a limiting concrete block is arranged on the top cap of the bridge pier of the present invention, and the limiting concrete block is located between the fixed support end and the movable support end; a steel rod channel is reserved in the limiting concrete block; the limiting concrete block and the bridge pier are made of the same grade of concrete;

[0041] Evenly apply non-shrinkage mortar at the longitudinal position of the beam end and the groove of the beam body where the fixed support is installed; the thickness of the non-shrinkage mortar is 50mm, and the surface of the non-shrinkage mortar is installed with wear-resistant steel plates and stainless steel plates;

[0042] A reserved steel rod is arranged in the reserved steel rod channel of the limiting concrete block, the reserved steel rod passes through the fixed end beam section partition wall, and a high-density polyethylene sleeve is arranged outside the reserved steel rod located in the fixed end beam section partition wall.

[0043] The restraining bolts are installed horizontally at the anchorage of the beam end, and tension is applied to the restraining bolts. The magnitude of the tension is calculated based on the controlled displacement of the beam end.

[0044] Drainage pipe holes are reserved in the limiting concrete blocks to facilitate the later installation of drainage pipes.

[0045] Type 2 elastic support pads are installed in the groove of the fixed end, and type 1 elastic support pads are installed at the movable end, so that it can move freely along the surface. The diameter of the high-strength steel rod is 60mm, the diameter of the drainage hole is 200mm; the thickness of the wear-resistant steel plate is 12mm, and the thickness of the stainless steel plate is 10mm.

[0046] The present invention connects the limiting concrete block on the top of the pier with the beam body by high-strength steel rods, provides corresponding constraints, consumes energy by the relative displacement between the wear-resistant steel plate and the stainless steel plate and the limiting concrete block, and extends the structural period, thereby greatly reducing the seismic response; the necessary connection between the bridge and the beam body is made by this device, effectively reducing the risk of beam falling during an earthquake.

[0047] The installation method of the bridge seismic isolation device of the present invention comprises the following steps:

[0048] Step 1: The limiting concrete blocks and the bridge piers are made of the same grade of concrete and are poured together during the construction of the bridge piers;

[0049] Step 2: Space must be reserved at the end of the fixed end beam to ensure that the limiting concrete block can be embedded in it;

[0050] Step 3: Holes must be reserved in the limiting concrete blocks to facilitate the later installation of high-strength steel rods and drainage pipes;

[0051] Step 4: Install high-density polyethylene sleeves and high-strength steel rods at the positions corresponding to the fixed end beam segment partition walls and the limiting concrete blocks.

[0052] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", and "fix" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The content of the present invention is not limited to the embodiments listed, and any equivalent changes made to the technical solution of the present invention by ordinary technicians in this field after reading the description of the present invention are covered by the claims of the present invention.

Claims

1. A bridge seismic isolation device, characterized in that: A limit concrete block is arranged on the top cap of the bridge pier, and the limit concrete block is located between the fixed support end and the movable support end; a steel rod channel is reserved in the limit concrete block; Apply non-shrinkage mortar to the longitudinal position of the beam end and the groove of the beam body where the fixed support is installed; A reserved steel rod is arranged in the reserved steel rod channel of the limiting concrete block, and the reserved steel rod passes through the partition wall of the fixed end beam section.

2. A bridge seismic isolation device according to claim 1, characterized in that: The limiting concrete blocks and bridge piers use the same grade of concrete.

3. A bridge seismic isolation device according to claim 2, characterized in that: Drainage pipe holes are reserved in the limiting concrete blocks to facilitate the later installation of drainage pipes.

4. A bridge seismic isolation device according to claim 3, characterized in that: Wear-resistant steel plates and stainless steel plates are installed on the surface of the non-shrinkage mortar.

5. A bridge seismic isolation device according to claim 4, characterized in that: A type 2 elastic support pad is installed in the groove of the fixed end.

6. A bridge seismic isolation device according to claim 5, characterized in that: Install type 1 elastic support pad at the movable end.

7. A bridge seismic isolation device according to claim 6, characterized in that: A high-density polyethylene sleeve is provided on the outside of the reserved steel rod located in the partition wall of the fixed end beam section.

8. A bridge seismic isolation device according to claim 7, characterized in that: The diameter of the high-strength steel rod is 60mm and the diameter of the drainage hole is 200mm.

9. A bridge seismic isolation device according to claim 8, characterized in that: The thickness of the wear-resistant steel plate is 12mm and the thickness of the stainless steel plate is 10mm.

10. A method for installing a bridge seismic isolation device, characterized in that: The steps include: Step 1: The limiting concrete blocks and the bridge piers are made of the same grade of concrete and are poured together during the construction of the bridge piers; Step 2: Space must be reserved at the end of the fixed end beam to ensure that the limiting concrete block can be embedded in it; Step 3: Holes must be reserved in the limiting concrete blocks to facilitate the later installation of high-strength steel rods and drainage pipes; Step 4: Install high-density polyethylene sleeves and high-strength steel rods at the positions corresponding to the fixed end beam segment partition walls and the limiting concrete blocks.

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