LIEN FOO RUBBER PRODUCTS CO., LTD

Pot bearing was first appeared in Europe in 1959. It is the most popular metal type bearing for bridges and buildings. In 1996, we took the lead in researching and designing pot bearings in Taiwan. Our pot bearings with well quality have been produced more than 20000 sets and earned highly appreciation.

Characteristics：

	Take extreme vertical and horizontal load

	Provide horizontal rotation for structures

	Easy observation & maintenance, replacing can be done with uplifting superstructure in 10mm

	Large horizontal movement and low friction coefficient for sliding type.

	Low bearing height

	Long life cycle and economic

Types：

　Pot bearing are available in three type: fixed, sliding guided and free movement.
　．Fixed type: accommodate vertical load and provides restraint in all horizontal directions (hinge).
　．Sliding guided type: accommodate vertical load and allow one horizontal direction sliding and restraint the
other horizontal directions (roller).
　．Free movement type: only accommodate vertical load and all the horizontal direction are free to move (roller).

　　　　　　　　LF type　　　　　　　LG type　　　　　　　LM type

Composition description：

　This following figure is for the superstructure and substructure of pot bearing is concrete. If the superstructure
　or substructure is steel, the installation method shall be bolt or welding connecting.

Features：

The elastomer is put into the base pot. For the reason of confinement effect, the elastomer can take extreme vertical and shows less deformation. However, consider the compressive strength of concrete, the design bearing stress of elastomer is limited to 240 kgf/cm2.

The elastomer protected by the seal rings can prevent the elastomer squeezing out.

The elastomer provides horizontal rotation for structures, just like the hinge or roller.

For sliding types, the sliding sheet(stainless steel plate) and PTFE disk form a excellent sliding surface with the friction coefficient bellow 0.03, just like the roller.


Base pot is made of one whole steel plate	Spread the lubricant on the elastomer	Corrosion protection


Equipped for anti-uplifted function	Full covered by stainless steel plate	Provide synthetic rubber shutters for expansion/contraction

Protect the sliding surface - the sliding pot bearing with full dust
cover can prevent the entrance of sand, dirt and dust.

Design code：
AASHTO, prEN 1337, BS 5400 or client’s specification.

Design condition：
　1. Design (vertical) load: 50~10000 ton
　2. Horizontal load: min. 10% of design vertical load or client’s requirement
　3. Rotation: 0.015 rad. or greater
　4. Displacement: client’s requirement
　5. Uplift load (only for anti-uplift pot bearing): min. 10% of dead load or client’s requirement

Test of Completed Pot Bearing：
In Taiwan, the requirement of pot bearing is in accordance with AASHTO 1996. The fixed types shall perform proof load test. The sliding types shall perform proof load test and sliding coefficient of friction test.

1. Proof Load Test:

2. Sliding Coefficient of Friction:

Load: 150% of design load
Rotation: 0.02 rad. or design rotation, whichever is greater.
Loading period: one hour

Load: 100% of design load
Loading period: 12 hours
Sliding: after 12 hours loading, hold the load and sliding with 1 inch/min. speed for 50 cycles.
The measured coefficient of friction in 1st, 5th and 50th cycles shall not exceed 3%.

Proof Load Test

The relation of displacement and horizontal
load in sliding coefficient of friction test