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What is the main purpose of pot type support

Source：www.jswanbao.com Release date： 2026-01-19

Basin type bearings are the core load-bearing components in bridges and large building structures, mainly used to connect the upper structure (beams, roof trusses) with the lower structure (piers, abutments, foundations). Their core function is to transfer loads, adapt to structural deformation, and ensure system stability. The specific uses and functional characteristics are as follows:
1、 Core application: Coordination of load transfer and structural deformation
1. Transfer the load of the upper structure
The pot type support uniformly transfers the vertical load (self weight, vehicle load, crowd load, etc.) of the bridge beam or building roof truss to the lower pier or foundation through the internal steel pot, rubber plate, and upper seat plate combination structure; At the same time, it can withstand horizontal loads (wind load, earthquake action, vehicle braking force), avoiding cracking and damage caused by local stress concentration in the structure. It is suitable for engineering scenarios with high loads, such as large-span bridges (such as continuous beam bridges, cable-stayed bridges), heavy-duty steel structure factories, and large-span venues.
2. Adapt to multi-directional deformation of the structure
Bridges may generate vertical angles and horizontal displacements under temperature changes and load, while building structures may deform due to settlement and wind vibration. Basin type supports compensate for deformation through their own structural design. In terms of vertical corners, the PTFE sliding plate and rubber pressure pad embedded in the support have elasticity and can rotate with the end of the beam, ensuring a tight fit between the beam and the support without any looseness; In terms of horizontal displacement, the low friction coefficient (≤ 0.03) of the PTFE sliding plate allows the beam to slide freely along the longitudinal or transverse direction when the temperature changes, reducing the additional stress on the structure.
2、 Special uses of different types of pot type supports
According to engineering requirements, pot type supports are divided into different types to solve complex working conditions problems in a targeted manner. The function of fixed basin type supports is to limit the horizontal displacement of the upper structure, allowing only vertical corners, and is suitable for bridge fixed piers and core load-bearing nodes of building structures. Unidirectional movable bowl type supports allow the upper structure to slide in one direction (longitudinal), limiting lateral displacement, and are suitable for the expansion end of continuous beams in bridges and longitudinal expansion joints in large-span factory buildings. Bidirectional active pot type supports allow the upper structure to slide in both directions along the longitudinal and transverse directions, and are suitable for bridge curved sections, wide bridges, and buildings in high-intensity earthquake zones. The anti-seismic basin type bearing is equipped with a built-in damper, which can absorb seismic energy, limit seismic displacement, and is suitable for bridges and large public buildings in areas with seismic intensity ≥ 8 degrees.
3、 Advantages and uses compared to traditional bearings
Compared to traditional products such as plate rubber bearings, pot bearings have a stronger load-bearing capacity (up to tens of thousands of tons) and a wider range of deformation adaptability, making them more suitable for projects with large spans, heavy loads, and complex working conditions. Firstly, it can replace plate rubber bearings and be used for large-span bridges (span ≥ 30m) to avoid plastic deformation of the bearings due to excessive load; Secondly, in high-intensity earthquake zones, seismic design can enhance the anti collapse ability of structures and ensure the safety of bridges and buildings during earthquakes; Thirdly, it is used in areas with large temperature differences (such as cold northern regions) to adapt to the significant expansion and contraction displacement of the beam caused by temperature changes and reduce bearing wear.

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