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Seismic resistance lrb lead rubber bridge bearing

Seismic resistance lrb lead rubber bridge bearing

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Supplier: Hongrui Boya (Tianjin) Trading Co. Ltd.

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Product Description

Seismic resistance lrb lead rubber bridge bearing

Introduction.

Seismic resistance lrb lead rubber bridge bearing are rubber bearings made up of alternate layers of steel laminates and hot vulcanized rubber with a cilindrical central lead core. The rubber in the bearing 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. The lead core provides damping by deforming plastically when the isolator moves laterally in an earthquake.

Applications.

Seismic resistance lrb lead rubber bridge bearing were installed under the girders of the isolated bridges. The bearings are supplied with guide bars that impede transverse movement. Lead-rubber bearings were chosen for the seismic isolation of these bridges. This type of bearing provides a good balance between damping and cost. Since all components are vulcanized inside the rubber, no special maintenance is required beyond that of laminated bearings.

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Seismic resistance lrb lead rubber bridge bearing

Features.

High quality rubber materials

Chloroprene (neoprene), natural rubber
or EPDM as elastomeric material.

Strong steel reinforced plates

Steel platesunder strict ISO 9001:2008 accredited quality control standards.

High purity lead core

The lead core is high purity and does not contain any impurities.

Technical performance.

Items			Index
Material			CR	NR	EPDM
Tensile Strength MPa (kgf/cm2)			17.0	18.0	15.0
Hardness (shore A)			60±5	60±5	60±5
Elongation at break %			400	450	350
Tensile set at break %			≤25	≤25	≤25
Compression set %			15	30	25
Tensile bond strength between rubber & steel plate MPa (kgf/cm2)			≥3.0	≥3.0	≥3.0
Brittleness temperature ℃			≤-40	≤-55	≤-60
Constant compression deformation%(70℃×22h)			≤25	≤25	≤25
Air Aging	Testing Conditions ℃×h	100×72	70×168	100×70
		variation in hardness (shore A)	0-10	0-10	0-10
		Tensile Strength change rate (Mpa)	≥-10	≥-15	≥-10
		Elongation at break change rate %	≥-30	≥-20	≥-20
Ozone Aging IPPM30℃×100h			No crack
Bending fatigue			No crack after bending 6×10 times

Item			Index
Ultimate compression strength Rd /MPa			≥60
Compression modulus of elasticity E1/ MPa			E±E×20%E
Shear modulus of elasticity G1 / MPa			G±G×15%G
Allows maximum shear deformation tg α			≤0.7
shear deformation produced by fast loading tg α			≤0.25
Anti-sliding friction coefficient	Against steel	0.2
Anti-sliding friction coefficient		Against concrete	0.3

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Seismic resistance lrb lead rubber bridge bearing

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Seismic resistance lrb lead rubber bridge bearing

Packing & Delivery

Packing Details: Platic film and pallets.
Delivery Details: 10-30 days after deposite.

Company and Clients

Hongrui Boya (belongs to Shuanglin Group) professionally supplys Road, bridge and building support, expansion joint, waterproof materials.
It has one factory, three companies for domestic and foreign markets. 50 workers, 8 enginnerings, and over 20years experience of manufacture.
Main products are Bridge bearings, bridge expansion joint, concrete waterstop products, rubber air bag, polysulfide sealant etc.
ISO certification, CE standard, AASHTO, and SGS test, with a wide range, good quality, reasonable prices and stylish designs, our products are extensively used in infraconstruction and other industries.