Lrb Seismic Isolation Bearings for Earthquake Resistant Structures

• Application: Earthquake Resistance
• Certification: CCC, CE, ISO
• Surface Treatment: Yes
• Material: Neoprene or Natural Rubber
• Bearing Capacity: 400-30000kn
• Size: 100mm to 2000mm
• Model NO.: LRB
• Transport Package: as Request
• Specification: LRB
• Trademark: HD
• Origin: China
• HS Code: 4016999090
• Production Capacity: 100, 000 Sets/Year

Product Description

LRB Seismic Isolation Bearings for Earthquake Resistant Structures

Seismic Isolation or also know as base isolation consist of a laminated rubber and steel bearing with steel flange plates for mounting to the structure. 90% of our isolators have an energy dissipating lead core.

The rubber in the isolator acts as a spring. It is very soft laterally but very stiff vertically. The high vertical stiffness is achieved by having thin layers of rubber reinforced by steel shims. These two characteristics allow the isolator to move laterally with relatively low stiffness yet carry significant axial load due to their high vertical stiffness. The lead core provides damping by deforming plastically when the isolator moves laterally in an earthquake.

Isolators from 200 to 1200 mm in diameter and capacities of up to 3000 tons are
manufactured. Custom dimensions are available for special applications.

The shims for isolators are cut to exacting tolerances by laser. The steel mounting plates are machined by computer controlled milling machines that give high production throughput and accuracy. Molding each bearing takes 8 to 48 hours depending on the size of the bearing. The curing phase is continuously monitored to ensure that the rubber is uniformly cured throughout the bearing.

JT/T4-2004		BS5400 Section 9.2
Natural Rubber	Neoprene CR	Natural Rubber	Neoprene CR
60±5	60±5	50±5/60±5/70±5
18	17	17	15.5
450	400	450/400/350	400/350/300
70 o C×22h		70 o C×22h	100 o C×22h
<30	<15	<30	<35
70 o C×168h	100 o C×70h	70 o C×168h	100 o C×48h
-5,+10	0,+10	<10	<15
<15		<15
<20	<40	<20	<40
25~50pphm,20% strain		25~50pphm,20% strain
40 o C×96h		30 o C×96h
No Cracks		No Cracks