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High Damping seismic isolation bearing
This kind of product is comprised of high-damping rubber & plate connected with bolts.
It is used under 8 degrees of seismic intensity in highways and municipal bridges. Products comply with: JT/T 842-2012 High damping seismic isolation rubber bearing for highway bridges& GB20688.2-2006 Elastomeric seismic protection isolators for bridges, Known as HDR, has very similar appearance to lead rubber bearings, but they are totally different in nature. High damping rubber bearing is composed of special rubber with excellent damping attribute, sandwiched together with layers of steel without any lead plugs.
Specification
Name: HDR bearing
Material: rubber
Brand : JINGTONG
CR suit temperaturer : CR -25°C~+60°C
NR suit temperaturer: NR
CR suit temperaturer : CR -25°C~+60°C
During the earthquake, the un-isolated building will vibrate back and forth in varying directions due to the inertial forces and result in deformation and damages of the building. In contrast, the base isolated building will also displace but remains its original shapes and avoid damages - that is because the lead rubber bearing effectively dissipates the inertial force upon the building, extends the building's period of vibration and decrease the acceleration of the building.
The lead plug will slid with laminated rubber during earthquake but convert this energy of movement to heat so that it efficiently reduces the inertial force upon the building, which slow the vibration of the building. Meanwhile, the rubber part will preserve its original shape due to high elasticity
Base isolation is a technique developed to prevent or minimise damage to buildings during an earthquake. It has been used in New Zealand, as well as in India, Japan, Italy and the USA.
A fixed-base building (built directly on the ground) will move with an earthquake's motion and can sustain extensive damage as a result.
When a building is built away (isolated) from the ground, resting on flexible bearings or pads known as base isolators, it will only move a little or not at all during an earthquake.
The rubber provides flexibility through its ability to move but return to its original position. At the end of an earthquake, if a building hasn't returned to its original position, the rubber bearings will slowly bring it back. This might take months, but it will return to its original position.
Lead was chosen because of its plastic property - while it may deform with the movement of the earthquake, it will revert to its original shape, and it is capable of deforming many times without losing strength. During an earthquake, the kinetic energy of the earthquake is absorbed into heat energy as the lead is deformed.
Using layers of steel with the rubber means the bearing can move in a horizontal direction but is stiff in a vertical direction.
Another method for controlling seismic damage in buildings is the installation of seismic dampers. In this case, the dampening is provided by a lead-based device that looks very similar to a car damper (shock absorber).
Ground movement forces the lead to pass through a narrow gap. When the direction of movement changes, the flow of lead is reversed. The principle is still the same as the lead rubber bearing, with kinetic energy being converted into heat energy, thereby preventing the building absorbing the kinetic energy.
Featurer
1.Stiff and strong in vertical direction but flexible in horizontal direction.
2.Absorb earthquake-generated force by changing the bearing's shape.
3.Allow the buildings to retain their original shapes and position owing to the high elastic force of rubber.
4.Capable to adjust damping amount just by changing the number of lead plugs.
5.Excellent vertical load capacity ranging from 5 tonf to 2000 tonf.
6.Reduce the ground acceleration by extending the structure vibration period.
7.High durable and elasticity of the rubber part - not suffer any damages during and after earthquake.
8.Easy to install without a separated damper.
9.Low maintenance.
10.With stable bilinear behavior shown as the above pictures
Application
| Permanent Service Loading N/mm2 | Ultimate shear strain (%) | |||
| уч>=300% | 300%>уч>=250% | 250%>уч>=200% | 200%>уч | |
| 6.0 | A1 | B1 | C1 | D1 |
| 8.0 | A2 | B2 | C2 | D2 |
| 10.0 | A3 | B3 | C3 | D3 |
| 12.0 | A4 | B4 | C4 | D4 |
Hengshui Jingtong Rubber Co., Ltd.
1. Hengshui Jingtong Engineering Rubber Co.,Ltd. is located in Hengshui City development Zone, covering an area of 98000 square meters, construction area of 45000 square meters, with more than 20 professional senior technical personnel.
2. There are 10 series, over 200 species and more than 2,000 specifications. Our main series include rubber water-stop series, rubber pipe plugs, and bridge rubber bearing series, etc.
3. Our engineering rubber products include: rubber waterproof stops, plate type bridge rubber bearings, pot type bridge rubber pneumatic molds/Gasbag inner molds, bridge expansion joints, rubber pipe bulges, etc.
All products have been authenticated by the Ministry of Communications, the Ministry of Railway and the Ministry of Water Conservancy, and have been authenticated with International Quality System Certificate.
Our products are widely recognized and trusted by users and can meet continuously changing economic and social needs.
Hengshui Jingtong Engineering Rubber, your best choice!
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