Lead Core Rubber Bearing Seismic Isolation Rubber Bearings for Bridges and Buildings

• Customization: Available
• After-sales Service: Installation Guide
• Warranty: 2 Years After Leaving The Factory
• Model NO.: JT-L630
• Certification: CE /ISO
• Usage: Beam Bridge, Highway Bridge, Railroad Bridge
• Structure: Laminated Rubber Bearing
• Material: Lead Bearing
• Activity: Multi Direction Movable Bearing
• Product Name: Vibration Isolating Rubber Bearing
• Type: Lnr/Lrb/Hdrb
• MOQ: 10 Pieces
• Shear Modulus: 0.8 MPa, 1.0 MPa, 1.2 MPa.
• Rad: 0.006 Rad and 0.008 Rad
• Horizontal Stiffness: ±50mm
• Transport Package: on The Tray
• Specification: customization
• Trademark: HengJingGong
• Origin: Hengshui, Hebei, China
• Package Size: 30.00cm * 30.00cm * 10.00cm
• Package Gross Weight: 30.000kg

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.

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.

Performance comparison between lead rubber bearings and ordinary rubber bearings

    There are significant differences in damping performance between lead rubber bearings and ordinary rubber bearings. The damping coefficient of the former typically exceeds 15%, while that of the latter is generally below 5%. This excellent damping property allows lead rubber bearings to effectively extend the structural period of bridges and significantly reduce the acceleration response of the superstructure. Under seismic action, lead rubber bearings can significantly improve the stress state of the structure during the earthquake due to their unique mechanical properties, making them particularly suitable for being set in areas with a seismic intensity of 8 degrees or higher.

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

Packaging & Shipping

Company Profile

    Hengshui Jingtong Rubber Co., Ltd., located in Hebei Province's Hengshui City, is a professional manufacturer of engineering rubber products. Our product range includes bridge bearings, expansion joints, water stop strips, water stop belts, inflatable cores, building deformation joint device and water plugs, which are widely used in bridge, tunnel, water conservancy, and power engineering projects. The company boasts advanced technology and mature processes to ensure reliable product quality.

    We have a professional technical team and a comprehensive after-sales service system to ensure customers receive high-cost-performance products and attentive service. Hengshui Jingtong Rubber Co., Ltd. is committed to continuous innovation to meet market demands and looks forward to esta  blishing long-term cooperative relationships with customers from both domestic and international markets.

FAQ

1.When can I get the quotation?
A:We usually quote within 24 hours after we get your inquiry.

2.How long can I expect to get the sample?
A:The samples will be ready for delivery in 5-10days. The samples will be sent to you via express and arrive in 5-7days.

3.How long is the delivery time
A:Usually 10-15 days, depending on the quantity purchased.

4.How can I get a sample to check your quality?
A:After negotiating the price, we will provide you with samples for testing.

5.what can you buy from us?
Bridge Bearing Pad,Seismic isolation bearing,Expansion Joint,Rubber Inflatable Airbag,Waterstop Belt/Strip,Steel Expansion Joint,Butyl Tape

6.What's payment term?
A:T/T, L/C at sight, Western Union