Polyurethane-Filled Height-Adjustable Bearings

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Stepless Height Adjustment – No jacking required | Controlled Operation Time | Long-Term Performance

Polyurethane-Filled Height-Adjustable Bearings

Overview

Innovative Design: Features grouting channels in baseplate for polyurethane injection；

Advanced Material: High-flow polyurethane with customizable curing time；

Enhanced Performance:

Waterproof | Corrosion-resistant | Aging-resistant | 2-3x higher load capacity than rubber bearings

Scope of Applications

Ideal for bridges/structures requiring vertical height adjustment capability.

20mm、40mm、60mm

Adjustment Range
2 million fatigue load cycles validated

Rear support height: constant

Features

Existing height-adjustable bearing solutions:

1. Shim adjustment: Steel shims are installed at the top or bottom plate of the bearing to adjust elevation; shims are unconstrained and prone to slippage.

2. Screw adjustment: A trapezoidal-threaded height adjuster is used to modify bearing height; prone to fatigue failure and lacks anti-loosening mechanisms.

3. Wedge block adjustment: Wedge-shaped steel plates are added at the top plate of the bearing for height adjustment; horizontal fixation is challenging, and planar dimensions are large.

4. Filling adjustment: The thickness of the load-bearing rubber plate in pot bearings is increased by injecting silicone rubber; material curing time is lengthy.

Our Solution:

Polyurethane material is synthesized from prepolymers, cross-linking agents, and chain extenders. The resulting material exhibits fluidity and gradually cures after the addition of specialized additives, with curing time adjustable based on the formulation.

Advantages

Time-controllable

Compared to traditional silicone rubber injection, polyurethane elastomer allows flexible adjustment of curing time；
Long-lasting durability

The material is waterproof, corrosion-resistant, and aging-resistant, with a load-bearing capacity 2–3 times higher than rubber；
Stepless height adjustment, no need for jacking beams

Enables stepless height adjustment without requiring jacking beams.

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