LNR（linear rubber bearing）：LNR-Ⅰ、LNR-Ⅱ for Seismic Isolation

LNR（linear rubber bearing）：LNR-Ⅰ、LNR-Ⅱ

The product is manufactured in accordance with EN15129 standard.

Natural rubber bearing (LNR) linear natural rubber bearing: a bearing that has no vertical lead core inside, and is formed by alternately stacking multiple layers of natural rubber and multiple layers of steel plates or other materials.

Marking method: The marking of bearing products should be composed of bearing type code, bearing shape and size.

Main parameter code: the circle is represented by the effective diameter (mm), and the rectangle is represented by the effective side length of the long side × the effective side length of the short side (mm).

Example 1: Natural rubber vibration isolation bearing, the effective diameter of the circular bearing is 500mm, marked as: LNR500.

Example 2: Natural rubber vibration isolation bearing, rectangular bearing size 500mm×600mm, marked as: LNR500×600.

Structural Requirements

Building seismic isolation rubber bearings with different usage requirements can have different lamination structures, sizes, manufacturing processes and formulation designs. Building seismic isolation rubber bearings should meet the required vertical bearing capacity, vertical and horizontal stiffness, horizontal deformation capacity, damping ratio and other performance requirements, and should have a service life of not less than 60 years.

Features of LNR Horizontal Force Dispersion Rubber Bearings

1) It has a good ability to adapt to the free expansion and rotation of the beam body;

2) It can meet the requirements of large shear displacement under the action of temperature change and earthquake, and the integrity of the bearing is good;

3) The bearing is effectively connected with the main girder and the bridge pier, and each pier bears the force together, especially for the curved girder bridge, the horizontal force dispersion effect is good:

4) Strong recovery ability, no residual deformation after large displacement shear deformation, and small change in characteristics;

5) Good creep characteristics and stable performance;

6) The surface of the bearing is covered with a rubber layer to protect the internal rubber from the influence of ozone, ultraviolet rays, etc., and has better aging resistance;

7) Easy to install, maintain, repair and replace.

Founded in 2016

Zhejiang Earthquake Prevention Technology Co., Ltd. is a holding subsidiary established by Hangzhou Diping Zhenan Technology Co., Ltd. in September 2020. Zhejiang Zhenfang Technology Co., Ltd. has a registered capital of 26 million yuan, its own factory building covers an area of 10,800 square meters, and the standard factory building area is 6,000 square meters. With the great help of the Institute of Engineering Mechanics of China Earthquake Administration, the company has established a technical team led by domestic experts in seismic reduction and isolation technology, which has laid a solid foundation for long-term development in the future.
Zhejiang Earthquake Prevention Technology Co., Ltd is a member of China Disaster Prevention Association. Famous LNR（linear rubber bearing）：LNR-Ⅰ、LNR-Ⅱ manufacturers and suppliers in China, we provide LNR（linear rubber bearing）：LNR-Ⅰ、LNR-Ⅱ for better Seismic Isolation system.

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product ADVANTAGE

Friction damper

It mainly includes the middle steel plate, the two outer steel plates and the friction material between the steel plates.
Simple mechanical model

Simple and easy analysis and design of structural vibration reduction.
Simple structure and low cost

Even large earthquakes are not damaged, so there is no need to replace.

Damping

The hysteresis curve is basically rectangular.
Stable performance

Velocity correlation, displacement correlation is small.
Good durability

No post-maintenance required.

Energy absorption

Vertical bearing capacity, horizontal restoring force, damping (energy absorption) trinity.
Damping ratio

Improved rubber formula, the equivalent damping ratio can reach more than 12%.
Maintenance costs

Low maintenance and management costs (no additional damping devices required).

Environmental friendly

HDR high damping rubber has low temperature dependence and is widely used in different climatic regions.
Creep properties

HDR high damping rubber has the same superior deformation performance as natural rubber.
Aging resistance

The surface of the high damping bearing is covered with a rubber protective layer to protect the internal rubber from ozone and ultraviolet rays.

Viscous resistance

It is a kind of damper related to stiffness and speed.
Widely used

It is used in high-rise buildings, bridges, seismic reconstruction of building structures and other fields.
Airbag

The damper absorbs and dissipates the impact energy of the earthquake on the building structure to the maximum extent.

Silicone oil medium

The medium has a small viscosity temperature coefficient, and good radiation resistance.
Electrical insulation properties
Ozone resistance, corona resistance

Building isolation products
Building Natural Rubber Bearing Type II ( LNR-II )	Building Natural Rubber Bearing TypeⅠ( LNR-Ⅰ)

Features: Superior performance, longer life, upgraded version	Features: Classic style, worth having
Specification: LRB/LNR-Ⅱ type (diameter: 200~ 1500mm)	Specification: LRB/LNR-Ⅰtype (diameter: 200~ 1500mm)

Category	unit	LNR 1500	LNR 1400	LNR 1300	LNR 1200	LNR 1100	LNR 1000	LNR 900	LNR 800	LNR 700	LNR 600	LNR 500	LNR 400	LNR 300
Effective diameter	mm	1500	1400	1300	1200	1100	1000	900	800	700	600	500	400	300
First shape factor S1	/	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15
Second shape factor S2	/	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5
Vertical stiffness (Kv)	kN/mm	7500	6900	6100	4700	4000	3900	3300	2700	2350	1800	1500	1200	550
Equivalent horizontal stiffness 100%	kN/mm	2.709	2.361	2.055	1.939	1.862	1.688	1.539	1.388	1.196	0.998	0.868	0.668	0.501
Total thickness of rubber layer	mm	240	240	240	220	204	186	167	149	130	112	94	75	58

Category	unit	LNR 1500	LNR 1400	LNR 1300	LNR 1200	LNR 1100	LNR 1000	LNR 900	LNR 800	LNR 700	LNR 600	LNR 500	LNR 400	LNR 300
Effective diameter	mm	1500	1400	1300	1200	1100	1000	900	800	700	600	500	400	300
First shape factor S1	/	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15
second shape factor S2	/	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5
Vertical stiffness (Kv)	kN/mm	7600	7050	6200	4900	4100	4000	3400	2800	2500	1900	1600	1300	650
Equivalent horizontal stiffness 100%	kN/mm	3.339	2.838	2.519	2.358	2.262	2.098	1.901	1.696	1.515	1.236	1.089	0.881	0.595
Total thickness of rubber layer	mm	240	240	240	220	204	186	167	149	130	112	94	75	58

Category	unit	LNR 1500	LNR 1400	LNR 1300	LNR 1200	LNR 1100	LNR 1000	LNR 9 00	LNR 800	LNR 700	LNR 600	LNR 500	LNR 400	LNR 300
Effective diameter	mm	1500	1400	1300	1200	1100	1000	900	800	700	600	500	400	300
First shape factor SI	/	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15	≥15
second shape factor S2	/	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5	≥5
Vertical stiffness (Kv)	kN/mm	7400	6800	6000	4600	3900	3800	3200	2600	2250	1800	1400	1100	500
Equivalent horizontal stiffness (Kh) 10	kN/mm	2.386	2.166	1.785	1.622	1.598	1.509	1.366	1.189	1.169	0.882	0.739	0.603	0.455
Total thickness of rubber layer	mm	240	240	240	220	204	186	167	149	130	112	94	75	58

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LNR（linear rubber bearing）：LNR-Ⅰ、LNR-Ⅱ

Founded in 2016

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