Can you provide made-to-order services upon request?
Yes. Please provide detailed requirement description (detailed design drawings are preferred) if you need customized products.
Can you supply drawings?
Yes, we can supply CAD or PDF drawing, including detailed technical data and installation guide.
Can you offer product catalogue and data sheets?
Yes, you can find our product catalog on the catalogue page. You can download it for reference. If you are interested in our products, you can contact us for more detailed information.
How can I place my order?
You may place your order in one of the following ways:
- You may contact us via instant messengers for example, WhatsApp, Skype or WeChat.
- You may fill out the feedback form at the bottom of every page and tell us your requirements.
- You may send an e-mail to tianyu@jingtongchina.net.
How long is the lifespan of seismic isolation bearing?
Seismic isolation bearing has exceptional durability, good fatigue resistance, excellent resistance to thermal air aging & ozone aging, great acid resistance, waterproof and fireproof performance. Generally, it enjoys a long service life that lasts up to 60 years.
What is the working temperature range of the seismic isolation bearing?
Its working temperature ranges from -40 °C to +60 °C.
What are differences among natural rubber bearing, lead rubber bearing and high damping rubber bearing?
Natural rubber bearing commonly works with dampers to form a complete set of seismic isolation system due to its low damping and poor seismic energy dissipation capacity.
Compared with natural rubber bearing, one or more lead cores are added inside the natural rubber bearings to form a lead rubber bearing. It absorbs seismic energy through the plastic deformation of lead cores. with a damping ratio of 20% to 30% , it can be independently used in the seismic isolation systems.
High damping rubber bearing is much the same as the natural rubber bearing in shapes and structures. The differences lay in a variety of compounding agents are added in the natural rubber bearing to improve the damping capacity of the rubber. With a damping ratio of 10% to 25%, it can be separately used in seismic isolation systems.
What is shear strain?
Typically, shear strain equals to the transverse deformation of the seismic isolation bearing divided by the rubber height. For example, the ultimate shear strain of a seismic isolation bearing is 400%. That means, under this strain, each layer of rubber is transversely deformed to four times its thickness.
Can I install more than one seismic isolation bearings under the same structural column?
- Multiple seismic isolation bearings can be used when multiple seismic isolation bearings cost less than single seismic isolation bearing with a large diameter;
- As the detection of seismic isolation bearing with a super- large diameter is restrained by test conditions, therefore, when the vertical loading capacity indeed requires a seismic isolation bearing with a super-large diameter, 2 seismic isolation bearings with a smaller diameter can be used, however, the ultimate deformation capacity requirements must be met.
Does lead core become fatigue after the earthquake?
Lead is a good ideal elastoplastic metal material with recrystallization function after large deformation. In addition, it is a good metal energy-consuming material with good fatigue resistance.
How to install a seismic isolation bearing?
How to replace the seismic isolation bearing?
During the service life of the building, if the seismic isolation bearings are damaged and its mechanical properties are permanent changed, the seismic isolation bearing shall be replaced in accordance with steps listed below.
- Install a jacket, screw out the upper anchor bolts and lift the beam 3 to 5 mm above the top surface of the seismic isolation bearing;
- Unscrew the lower anchor bolts from the seismic isolation bearing;
- Remove the existing seismic isolation bearings (excluding pre-buried steel plates);
- Install new seismic isolation bearings of the same size.
- Align the position, tighten the lower anchor bolts and secure the seismic isolation bearings;
- Place the beam slowly, screw in the upper anchor bolts, remove the jack, and the replacement process is finished.
What environmental protection measures are taken during the seismic isolation bearing construction?
- In the absence of a night construction permit, no noisy work shall be carried out after 10 p.m. The construction time shall be reasonably arranged to minimize noise disturbance during night work. During the installation and construction, steel plates shall not be struck at will, and the influence of noise on the surrounding environment shall be strictly contained;
- Welding slags and other wastes shall be collected promptly after welding to keep a neat and clear construction surface. Make sure all wastes are removed when the construction is completed.
Precautions in handling and storage of seismic isolation bearings
- Store the products in a dry, ventilated place that is far away from corrosive gases, sunlight exposure (ultraviolet) and heat sources. Products must not get wet in the rain.
- Products and accessories shall be stored by category and shall neither be mixed nor scattered. When products are stacked for storage, steel plates shall be taken as the reference surface for a neat and firm stacking.
- The protective packing shall be restored when the open-package inspection is finished.
- During the handling, double ring lifting is employed. Single ring lifting or tilting lifting shall be strictly forbidden. Connecting bolt hole lifting shall be strictly prohibited, so as to prevent damage to connecting plate bolt holes.
- During handling, products shall be handled with care, and shall not be lifted and dropped suddenly.
