Pot Bearing

GPZ Pot-Type Bearings for Highway Bridges： In addition, according to the displacement ability, pot bearing can be divided into three types: fixed pot bearing (GD), guided sliding pot bearing (DX) and free sliding pot bearing (SX). Fixed pot bearing and guided sliding pot bearing can also be divided into common pot bearing and damping pot bearing. The appearance of these pot bearings is similar, but the difference of internal structure directly determines whether the bridge can be displaced.

Fixed Pot Bearing – Rotation Performance Only：Fixed pot bearing consists of top and bottom steel plates, stainless steel plate, piston, brass sealing ring and elastomeric pad. The internal sealing ring enables the piston to rotate under load. This kind of pot bearing has rotation performance but restricts all displacement in planar axis.

GPZ pot rubber bearing (unidirectional sliding type) is designed for bridge structures, combining high-strength steel and durable elastomer. It allows controlled movement in one direction while restricting sliding in the other, effectively meeting structural load and displacement requirements. It is widely used in highway bridges, railway bridges, and large-scale infrastructure projects.

Working Principle： There is an elastomeric pad in the pot of the pot bearing, it has fluid properties when it in the state of three-phase stressed, making use of this feature can achieve large rotation of the bearing. In addition, when a relative motion occurs between the PTFE plate which placed on the piston and the stainless steel plate, horizontal displacement can be achieved. Pot bearing can meet the requirements of large end reaction, large horizontal displacement and large rotation, it is suitable for the bridge with large span and large end reaction

Technical Performance：

·Bearing capacity of the pot bearing is 100% of the design capacity and allow overloading 10%.
·When working temperature changes from -25 °C to + 60 °C, the minimum design friction coefficient of pot bearing is 0.03. When working temperature changes from -40 °C to + 60 °C, the minimum design friction coefficient of pot bearing is 0.06.
·The maximum rotation of pot bearing is 0.03 rad.

Working Temperature：

·Normal temperature type: -25 °C to + 60 °C.
·Cold resistance type: -40 °C to + 60 °C.

Feature：

·With low-profile but high loading capability over 50,000 kN than elastomeric bearing.
·Shearing strength of elastomeric pad is increased through the method of encasing it in the steel pot.
·Allow for large rotations ranging from 0 to 0.03 rad.
·Low friction coefficient between 1% and 3%.

Application：
Pot bearings are suitable for locations where low-profile, high-load bearing devices are required. And they are especially suited for curved or skewed bridges and other complex structures where the direction of rotation varies or cannot be precisely determined.