CN105696460A

CN105696460A - Negative direction variable-rigidity laminated rubber bearing

Info

Publication number: CN105696460A
Application number: CN201610167276.8A
Authority: CN
Inventors: 欧阳先凯; 罗启; 牟廷敏
Original assignee: Sichuan Xianghui Road & Bridge Engineering Co Ltd
Current assignee: Sichuan Xianghui Road & Bridge Engineering Co Ltd
Priority date: 2016-03-23
Filing date: 2016-03-23
Publication date: 2016-06-22

Abstract

The invention discloses a negative direction variable-rigidity laminated rubber bearing. A bearing main body consists of an upper sealing plate, a lower sealing plate and a steel framework, wherein the steel framework is arranged between the two sealing plates; the steel framework is provided with hollow steel plate layers (5) and solid steel plate layers (6) in an alternate and staggered way; the hollow steel plate layers are steel plates provided with uniformly distributed holes (5a); the covering density of the holes is determined according to the calculation result. When the horizontal rigidity of the bearing needs to be reduced, the goal is achieved through improving the hole distribution covering density. The negative direction variable-rigidity laminated rubber bearing has the characteristics that the structure is simple; the operation is simple, and the operation is convenient. Under the condition of not changing the appearance dimension, the carrying capability and the vertical rigidity, the goal of changing the combined horizontal rigidity of a bridge pier is achieved through changing the horizontal rigidity of the bearing, so that the bridge piers with the same cross section and different heights can have the consistent horizontal rigidity; and the dynamic loading effect and the shock reduction and isolation effects of a bridge structure can be improved.

Description

Negative sense variation rigidity laminated rubber bearing

Technical field

The invention belongs to supporting bridge technical field, be specifically related to a kind of New-type plate rubber support。

Background technology

Background one: bridge increasingly tends to lightness, economy, the application of flexible pier is exactly one of classic approach。Aseismic Design Theory is thought: if each bridge pier same in beam structure undertakes horizontal earthquake active force jointly equably, then can be substantially reduced the antidetonation to anchor block to rely on, reduce the construction cost of bridge, also can get a promotion on the aesthetic property of bridge simultaneously。In order to make each bridge pier shared horizontal applied force, then need the horizontal rigidity of each pier is controlled。If to accomplish further uniformly to undertake, then require that the combined horizontal rigidity of each pier reaches unanimity。The combined horizontal rigidity of pier is " pier shaft horizontal rigidity+bearing horizontal rigidity "。

Background two: according to the existing industry standard JT/T663-2006 laminated rubber bearing selected, bearing to vertical bearing capacity of the same race, when highly consistent, it is vertical, horizontal rigidity is consistent or basically identical, if needing to change one of them parameter (vertical bearing capacity, vertical rigidity or horizontal rigidity), another two parameters then can change, and substantially linear。This kind of bearing is " Standard abutments "

The laminated rubber bearing of prior art is made up of two connection seats of support body and the symmetrical support body top and bottom that are placed in。Connection seat is by junction steel plate and is placed on junction steel plate and constitutes for the anchor bolt being connected with beam body, and support body is made up of upper and lower two shroudings and the steel skeleton being placed between these two shroudings, and steel skeleton is the structure having multiple steel plate with intermediate gelatine layer interlayer。

For the bridge consistent across footpath, pier shaft height is identical, " Standard abutments " can meet design and use demand。But for Bridges in Mountainous Areas, same bridge is likely to the pier shaft having differing heights, to this, pier shaft height consistent across footpath same bridge structure not etc., its vertical bearing capacity is identical with vertical rigidity requirement, in order to make integrin pier shaft horizontal rigidity design load identical, when pier shaft horizontal rigidity is inconsistent, then needs to adjust the horizontal rigidity of bearing, make combined horizontal rigidity reach unanimously。Owing to " Standard abutments " is difficult to meet the design requirement of each pier shared horizontal force on basis economic, attractive in appearance。Being actually needed according to engineering, supplements a kind of adjustable bearing of horizontal rigidity, with " Standard abutments " fit applications in Practical Project。As the structure that it is concrete, relate to " negative sense variation rigidity laminated rubber bearing " (the application scheme) that weaken relative to " Standard abutments " horizontal rigidity, with " forward variation rigidity laminated rubber bearing " (proposing the same period with the application scheme) higher relative to " Standard abutments " horizontal rigidity。

Summary of the invention

It is an object of the invention to overcome the deficiency of working standard bearing, solve the structure unicity of prior art, a kind of variable (weakening) rigidity rubber support is provided, this bearing can make bridge common uniform stressed of each bridge pier when operation or earthquake, improve the dynamic load effect of bridge and subtract vibration isolating effect, ensure that bridge structure runs comfortable and safe property, and extend its service life。

For reaching above-mentioned purpose, the technical solution adopted in the present invention is: a kind of negative sense variation rigidity laminated rubber bearing, is made up of two connection seats of support body and the symmetrical support body top and bottom that are placed in；Described connection seat is by junction steel plate 1 and is placed on junction steel plate and constitutes for the anchor bolt 8 being connected with beam body；Described support body is made up of upper and lower two shroudings and the steel skeleton being placed between these two shroudings, and described steel skeleton has multiple interlayer of steel plate, is equipped with intermediate gelatine layer 4 between each interlayer of steel plate, is provided with protection rubber 7 in the termination, left and right of interlayer of steel plate and interlayer of steel plate；Support body is coupled with two connection seats by sunk screw 2 by junction steel plate 1 and shrouding 3。Described steel skeleton staggered floor is arranged alternately hollow steel flaggy 5 and single solid steel flaggy 6；Described hollow steel flaggy is the steel plate being uniformly distributed hole 5a；The coverage density of hole calculates according to actual needs to be determined；Protection rubber 7, shrouding 3, intermediate gelatine layer 4 form support body with interlayer of steel plate through sulfuration。

Further, the hole of described adjacent hollow steel plate layer is coaxially disposed。

So, the relative purpose weakened of bearing horizontal rigidity is reached with the reasonable combination of solid steel plate 6 by hollow steel flaggy 5。

When horizontal rigidity weakens required for bearing, raising hollow steel flaggy 5 hole distribution coverage density is adopted to be achieved。The present invention has simple in construction, easy to operate feature。Under overall dimensions, bearing capacity, the immovable condition of vertical rigidity, the purpose of the combined horizontal rigidity of bridge pier is reached to change by changing bearing horizontal rigidity, make that cross section is identical, highly bridge pier horizontal rigidity not etc. is consistent, reach improve Bridge Dynamic Load effect and subtract the purpose of function of shock insulation。This bearing is particularly well-suited to mountain area, Gao Xia area concrete continuous girder bridge girder construction。

The present invention also can be substantially reduced bridge construction construction cost, effectively reduces the overall cost of bridge。Simultaneously because each pier face profile size can be accomplished unanimously so that bridge also can obtain certain lifting on aesthetic property。

Accompanying drawing explanation

Accompanying drawing 1 is the sectional view of the present invention。

In figure: 1-junction steel plate, 2-sunk screw, 3-shrouding, 4-intermediate gelatine layer, the hollow steel plate of 5-, 5a-hole, 6-solid steel plate, 7-protect rubber, 8-anchor bolt, 9-steel bushing。

Detailed description of the invention

Below in conjunction with accompanying drawing, technical scheme is described in detail:

As shown in Figure 1: a kind of negative sense variation rigidity laminated rubber bearing, it is made up of junction steel plate 1, sunk screw 2, shrouding 3, intermediate gelatine layer 4, hollow steel plate 5, solid steel plate 6, protection rubber 7, anchor bolt 8, steel bushing 9。Actual requirement of engineering is provided with the hollow steel plate 5 of certain hole 5a quantity and solid steel plate 6 in the vertical direction interval staggered floor is alternately evenly arranged。Protection rubber is arranged on around bearing, and to protect shrouding, intermediate gelatine layer, hollow steel plate, solid steel plate not to be polluted by air and ultraviolet etc., they form an entirety through sulfuration, are called support body。The attached structure that junction steel plate 1, sunk screw 2, anchor bolt 8, steel bushing 9 are connected with beam body, pinner as support body, is separately positioned on the upper/lower terminal of bearing。

The present invention can reduce bearing horizontal rigidity by solid steel plate 6 with the combination of hollow steel plate 5。Thus it is consistent to reach bridge each pier composite rigidity, it is ensured that the common uniform stressed of each pier of bridge, improve structural dynamic effect and damping and isolation effect。Therefore protection scope of the present invention is not limited in embodiment of above, these innovation and creation is made equivalent replacement and improves also within the protection domain of the invention。

Claims

1. a negative sense variation rigidity laminated rubber bearing, is made up of two connection seats of support body and the symmetrical support body top and bottom that are placed in；Described connection seat is by junction steel plate (1) and is placed on junction steel plate and constitutes for anchor bolt (8), the steel bushing (9) being connected with beam body；Support body is made up of upper and lower two shroudings and the steel skeleton being placed between these two shroudings; described steel skeleton has multiple interlayer of steel plate; it is equipped with intermediate gelatine layer (4) between each interlayer of steel plate, is provided with protection rubber (7) in the termination, left and right of interlayer of steel plate and interlayer of steel plate；Support body is coupled with two connection seats by sunk screw (2) by junction steel plate (1) and shrouding；It is characterized in that, described steel skeleton staggered floor is arranged alternately hollow steel flaggy (5) and single solid steel flaggy (6)；Described hollow steel flaggy is the steel plate being uniformly distributed hole (5a)；The coverage density of hole is determined according to result of calculation；Protection rubber (7), shrouding (3), intermediate gelatine layer (4) form support body with interlayer of steel plate through sulfuration。

2. negative sense variation rigidity laminated rubber bearing according to claim 1, it is characterised in that: the hole of described adjacent hollow steel plate layer is coaxially disposed。