Earthquake anti-sliding support for steel structure bridge

Abstract

The utility model relates to an earthquake anti-sliding support for a steel structure bridge, which solves the problems that the steel structure bridge is prone to disengagement and sliding and the horizontal bearing capacity of the support is insufficient under extreme conditions. A steel structure beam plate is erected on a pier, an anti-sliding support is arranged between the bottom face of the steel structure beam plate and the top face of the pier, the anti-sliding support comprises a support padstone arranged at the top of the pier, a support lower steel plate is arranged on the upper surface of the support padstone, and the upper surface of the support padstone is fully covered with the support lower steel plate. Anti-push check blocks are arranged at the two ends of the support lower steel plate respectively, a support base body is arranged in the middle of the upper surface of the support lower steel plate in a buckled mode, and a support upper steel plate fixed to the upper surface of the support base body is arranged on the lower surface of the steel structure beam plate. According to the device, three-stage rigidity seismic resistance, namely the anti-pushing rigidity of a support elastic body, the displacement release section and the stop block shear resistance, is achieved in the first stage, and the seismic resistance requirement is met with the minimum cost.

Description

Technical Field

[0001] The utility model belongs to the field of bridge structures and relates to a bridge pier structure, in particular to an earthquake-resistant sliding bearing for a steel structure bridge. Background Art

[0002] With the promotion and application of steel bridges in highway and municipal projects, small and medium-span steel bridges have seen significant development in recent years due to their high degree of industrialization, ease of erection and installation, and lower substructure requirements. In July 2016, to promote the transformation and upgrading of highway construction, enhance the quality of highway bridges, and fully leverage the performance advantages of steel bridges, the Ministry of Transport decided to promote the construction of highway steel bridges (including steel box girders, steel trusses, and steel-concrete composite beams) and issued the "Guiding Opinions on Promoting the Construction of Highway Steel Bridges."

[0003] With the increasing use of small and medium-span steel bridges, traditional plate rubber bearings have shown significant performance shortcomings. Traditional plate rubber bearings, primarily used in hollow slabs, small box girders, T-beams, and short T-beams, have long been popular due to their cost-effectiveness. However, due to the relatively low deadweight of steel bridges and the high proportion of live loads, steel bridges often experience bearing voids under the most unfavorable loading conditions, excessive bearing slip under E2 earthquakes, or the horizontal effect of bearings under seismic loads exceeding their anti-slip bearing capacity. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that the existing steel structure bridges are prone to bearing voiding, bearing slippage and insufficient horizontal bearing capacity of the bearings under extreme circumstances due to the light weight of the structure and the large proportion of live load. The utility model provides an earthquake-resistant slip bearing for steel structure bridges, and generally improves the process of traditional plate rubber bearings to make them meet the force and use requirements of the most widely used small and medium-span steel structure bridges, avoiding the defects caused by bearing voiding, excessive slippage and insufficient horizontal bearing capacity of the bearings under E2 earthquake conditions.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a steel structure bridge earthquake anti-slip bearing, comprising a steel structure beam plate, the steel structure beam plate is erected on the bridge pier, and an anti-slip bearing is provided between the bottom surface of the steel structure beam plate and the top surface of the pier. The anti-slip bearing comprises a bearing pad stone arranged on the top of the bridge pier, and the upper surface of the bearing pad stone is provided with a bearing lower steel plate. The bearing lower steel plate fully covers the upper surface of the bearing pad stone, that is, the end portion of the bearing lower steel plate is flush with the end portion of the bearing pad stone, and anti-thrust blocks are respectively provided at both ends of the bearing lower steel plate. A bearing base is buckled at the middle portion of the upper surface of the bearing lower steel plate, and a bearing upper steel plate fixed to the upper surface of the bearing base is provided on the lower surface of the steel structure beam plate, and displacement guide rods are respectively provided on both sides of the bearing base in alignment with the anti-thrust blocks at both ends. The outer end of the displacement guide rod passes through the anti-thrust block and extends to the outer side of the anti-thrust block, and the outer end of the displacement guide rod is provided with a contact plate.

[0006] Compared with conventional bearings, this device increases the size of the steel plate under the bearing to solve the problem of displacement release under major earthquake conditions and reduce the horizontal force of the earthquake. A steel anti-thrust block is set at the outer end of the steel plate under the bearing to solve the structural measure of preventing the beam from falling after the displacement release of a major earthquake; at the same time, the structural shear resistance of the steel anti-thrust block forms a third stage of horizontal anti-thrust stiffness. The three-stage stiffness earthquake resistance is formed, with the first stage being the anti-thrust stiffness of the bearing elastomer, the second stage being the displacement release stage, and the third stage being the shear resistance of the block, thus achieving the earthquake resistance requirements at the minimum cost. The displacement guide rod can guide the sole of the bearing and suppress the jumping caused by the displacement of the bearing.

[0007] Preferably, a polytetrafluoroethylene (PTFE) plate is provided between the upper surface of the support lower steel plate and the support base. The PTFE plate is located on the upper surface of the lower steel plate at the bottom of the integral support, and the support base is buckled between the PTFE plate and the support lower steel plate, thereby increasing the sliding stability of the support.

[0008] Preferably, the sum of the length of the displacement guide rod and the width of the support base is not less than the distance between the two anti-thrust blocks.

[0009] Preferably, the support base includes a bowl-shaped cover body that opens downward, and the interior of the cover body is composed of an upper rubber block, a middle steel plate, and a lower rubber block from top to bottom, and the cover body is made of steel.

[0010] Preferably, the inner end of the displacement guide rod is fixed to the outer wall of the cover body.

[0011] Preferably, the inner side surface of the anti-thrust block is a vertical surface.

[0012] Preferably, the anti-thrust block is a steel block, and the anti-thrust block is fixed to the lower steel plate of the support with bolts.

[0013] Preferably, the lower steel plate of the support is fixed to the support pad stone with embedded bolts, and the upper steel plate of the support is fixed to the steel structure beam plate with embedded bolts.

[0014] The utility model has the following beneficial effects: 1. The support base is consolidated with the upper and lower steel plates, and the upper and lower steel plates are connected with embedded bolts to achieve a firm connection between the static load support and the upper and lower structures, solve the problem of the side supports of multi-span continuous beams being emptied under the most unfavorable working conditions, and solve the problem of the stability of large cantilever bridges under eccentric loads. 2. Flexible connecting keys are used to allow the bridge to have a large horizontal displacement under large earthquake conditions. At this time, the horizontal displacement of the rubber between the upper and lower steel plates is released, the horizontal stiffness of the pier body is greatly reduced, the horizontal earthquake force on the structure is very small, the bearing capacity of the pier body and the pile foundation is guaranteed, and the safety of the structure is not damaged. The bridge pier body does not need to waste cross-section and engineering volume for rare earthquakes, making the bridge lighter and more beautiful. 3. Displacement restriction measures are adopted to ensure that the bridge can be subjected to limiting force under excessive displacement, solve the requirements for preventing beams from falling under high-intensity conditions, and achieve the ultimate safety of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 It is a structural schematic diagram of the present utility model.

[0017] In the figure: 1. Steel structure beam plate, 2. Support pad stone, 3. Support lower steel plate, 4. Teflon plate, 5. Support base, 6. Support upper steel plate, 7. Anti-thrust block, 8. Displacement guide rod, 9. Contact plate. DETAILED DESCRIPTION

[0018] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0019] Example: A seismic anti-slip bearing for a steel structure bridge, such as Figure 1 As shown. The device includes a steel structure beam slab 1, which is erected on the bridge pier, and an anti-slip support is provided between the bottom surface of the steel structure beam slab and the top surface of the bridge pier. The anti-slip support includes a support pad 2 provided on the top of the bridge pier, and a support lower steel plate 3 is provided on the upper surface of the support pad. The support lower steel plate 3 fully covers the upper surface of the support pad 2, that is, the end of the support lower steel plate is flush with the end of the support pad. The support lower steel plate 3 is fixed to the support pad 2 with embedded bolts. Anti-thrust blocks 7 are respectively provided at both ends of the support lower steel plate 3, which are steel blocks, and are fixed to the support lower steel plate with bolts. The inner side surface of the anti-thrust block 7 is a vertical surface, which can be an angle steel.

[0020] A support base 5 is buckled in the middle of the upper surface of the support lower steel plate 3, and a polytetrafluoroethylene plate 4 is provided between the upper surface of the support lower steel plate 3 and the support base. A support upper steel plate 6 is provided on the lower surface of the steel structure beam plate 1 and is fixed to the upper surface of the support base. The support upper steel plate is fixed to the steel structure beam plate with embedded bolts.

[0021] The support base 5 includes a bowl-shaped cover body that opens downward, and the interior of the cover body is composed of an upper rubber block, a middle steel plate, and a lower rubber block from top to bottom, and the cover body is made of steel. Displacement guide rods 8 are provided on both sides of the support base body, aligned with the anti-thrust blocks at both ends, and the inner ends of the displacement guide rods 8 are fixed to the outer wall of the cover body. The outer ends of the displacement guide rods 8 pass through the anti-thrust block 7 and extend to the outside of the anti-thrust block, and the outer ends of the displacement guide rods are provided with a contact plate 9. The sum of the length of the displacement guide rod 8 and the width of the support base body is not less than the spacing between the two anti-thrust blocks. The length of the displacement guide rod 8 ensures that when the anti-thrust block on the opposite side fails, the displacement guide rod hooks the anti-thrust block on the same side through the contact plate 9 to prevent the base body from falling out of the range of the support pad.

Claims

1. A seismic anti-slip bearing for a steel structure bridge, comprising a steel structure beam plate, the steel structure beam plate being erected on a bridge pier, and an anti-slip bearing being provided between the bottom surface of the steel structure beam plate and the top surface of the bridge pier, characterized in that: The anti-slip bearing includes a bearing pad stone arranged on the top of the pier, and a bearing lower steel plate is arranged on the upper surface of the bearing pad stone. The bearing lower steel plate fully covers the upper surface of the bearing pad stone, that is, the end of the bearing lower steel plate is flush with the end of the bearing pad stone, and anti-thrust blocks are respectively provided at both ends of the bearing lower steel plate. A bearing base is buckled on the middle part of the upper surface of the bearing lower steel plate, and a bearing upper steel plate fixed to the upper surface of the bearing base is provided on the lower surface of the steel structure beam plate. Displacement guide rods are respectively provided on both sides of the bearing base in alignment with the anti-thrust blocks at both ends. The outer end of the displacement guide rod passes through the anti-thrust block and extends to the outside of the anti-thrust block, and the outer end of the displacement guide rod is provided with a contact plate.

2. The seismic anti-slip bearing for steel structure bridge according to claim 1, characterized in that: A polytetrafluoroethylene plate is provided between the upper surface of the support lower steel plate and the support base.

3. The seismic anti-slip bearing for steel structure bridge according to claim 1, characterized in that: The sum of the length of the displacement guide rod and the width of the support base is not less than the distance between the two anti-thrust blocks.

4. The seismic anti-slip bearing for steel structure bridge according to claim 1, characterized in that: The support base comprises a bowl-shaped cover body which opens downwards, and the interior of the cover body is arranged from top to bottom in order of an upper rubber block, a middle steel plate and a lower rubber block, and the cover body is made of steel.

5. The seismic anti-slip bearing for steel structure bridge according to claim 4, characterized in that: The inner end of the displacement guide rod is fixed to the outer wall of the cover body.

6. The seismic anti-slip bearing for steel structure bridge according to claim 1, characterized in that: The inner side surface of the anti-thrust block is a vertical surface.

7. The seismic anti-slip bearing for steel structure bridge according to claim 1, characterized in that: The anti-thrust block is a steel block, and the anti-thrust block is fixed to the lower steel plate of the support by bolts.

8. The seismic anti-slip bearing for steel structure bridge according to claim 1, characterized in that: The lower steel plate of the support is fixed to the embedded bolts of the support pad stone, and the upper steel plate of the support is fixed to the embedded bolts of the steel structure beam plate.

Images