High Damper Rubber Bearing (HDR) Seismic Isolation Bridge Bearings High Damping Bridge Vibration Isolation Bearing

• Customization: Available
• After-sales Service: 24 Hours-7 Days-Available
• Warranty: 2 Years After Leaving The Factory
• Model NO.: JT4174IKR
• Certification: GB, BS, ASTM, CE, ISO
• Usage: Beam Bridge, Highway Bridge, Railroad Bridge, Building
• Structure: Laminated Rubber Bearing
• Material: Rubber and Steel
• Activity: Fixed Bearing
• Name: Seismic Isolation System Bearing for Buildings
• Leading Time: 15days
• Top Plate Shape: Square/Circle
• Print Stanard: ISO Print Standard
• Steel Plate Thickness: 22-25mm
• Customized: Customized
• Transport Package: with Film on Pallet
• Specification: CE, ISO
• Trademark: HengJingGong
• Origin: China
• HS Code: 40169990
• Production Capacity: 10000 PCS Per Year

Product Description

Product Description

Lead Rubber Bearing – Excellent in Absorb Energy Dissipation and Seismic Isolation

    Lead rubber bearing, also called lead core rubber bearing, LNR rubber bearing, has similar structure with high damping rubber bearing. It is an important component of seismic isolation bearing. It is composed of laminated rubber bearing and lead core. The lead core can not only bear the heavy load and horizontal force, but also absorb energy through plastic deformation of hysteresis damping.

    Lead rubber bearing can be divided into round and rectangular shapes for different application. Additional, the lead core quantity can be single or multiple to supply maximum flexibility in the bridges or building.

Working principle

    The lead rubber bearing has same mechanical properties with laminated rubber bearing. Besides, it has high damping property.

As we all know, the laminated rubber bearing has large displacement deformation in horizontal direction.

    In the earthquake, this structure can separate top and bottom structure vibration, enlarge self vibration cycle and reduce seismic force. Besides, the lead core will be squeezed and yielded during the shear process to dissipate Seismic force.

    After the earthquake, the lead rubber bearing can help building restore the normal position through dynamic recovery and recrystallization of lead core and shear strain of laminated rubber bearing.

        *Vertical loading transfer process: beam → top embedded steel plate → top connecting steel plate → top sealing steel plate → laminated rubber   bearing with lead core structure → bottom sealing steel plate → bottom connecting steel plate → pier.
        *Horizontal loading transfer process: pier → bottom anchor bolts → bottom connecting steel plate → top sealing steel plate and shear tenon → top  connecting steel plate → top embedded steel plate → anchoring components.

Function of lead core bearing pad

*Top and bottom plates: transfer loading and constraint deformation of lead core.
*Lead plug: dissipate energy and decrease displacement.
*Steel reinforcing plates: increase vertical stiffness and constraint deformation of lead core.
*Internal rubber layers: support structure weight, accommodate rotation and displacement, recovery moving bearing to the original position.
*Rubber cover: protect reinforced steel plates and rubber layers.

Specification

*Shear modulus: 0.8 MPa, 1.0 MPa, 1.2 MPa.
*Working temperature range: -25 °C to +60 °C.
*Lead core quantity: single or multiple.
*Shape: rectangular and round.
*Technical parameter

    *Rectangular lead rubber bearing specifications.
    *Round lead rubber bearing specifications.

Rectangular lead rubber bearing.

Round lead rubber bearing.

No	Test Item		Technology Requirement	Unit
1	Hardness (Shore A)		60±5	HD
2	Tensile Strength		≥ 18	MPa
3	Elongation At Break		≥ 550	%
4	Compression Set	709 °C × 24 H	≤ 30	%
5	Brittleness Temperature		≤ -50	°C
6	Ozone Aging(50 PPHM, 20% Elongation, 40 °C × 48 H)		No Creak	–
7	Air Aging	Hardness Change (Shore A)	≤ +6	HD
		Tensile Strength Chang Rate	≤ 12	%
	-	Elongation At Break Chang Rate	≤ 20	%

Installation

Product Details

    Lead rubber bearing, main branch of seismic isolation system, is widely applied to the large sized structures such as road bridges, rail bridges and nuclear power station to minimize damages from dynamic loads like earthquake.

Packaging & Shipping

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