What are the core advantages of the GPZ bowl support
The core advantages of GPZ bowl type bearings are concentrated in six aspects: high load-bearing capacity, large displacement, low friction, strong seismic resistance, compact structure, durability and economy. It is the mainstream bearing scheme for large-span bridges.
The core advantages of GPZ bowl type bearings are concentrated in six aspects: high load-bearing capacity, large displacement, low friction, strong seismic resistance, compact structure, durability and economy. It is the mainstream bearing scheme for large-span bridges.
1、 High vertical bearing capacity (core advantage)
Wide bearing capacity range: covering 0.4MN to 60MN (40 tons to 6000 tons), with a total of 33 specifications, meeting the needs of super large bridges.
Excellent pressure bearing performance: The rubber inside the pot is constrained by the steel pot in three dimensions, in a "liquid" state, with high compressive modulus, uniform stress, and small deformation; Compression deformation under vertical load ≤ 2% of total height, residual deformation ≤ 5%.
Overloading allowed: Conventional use can be overloaded by 10%, with high safety redundancy.
2、 Good displacement and rotation performance
Large horizontal displacement: The bidirectional active type (SX) can achieve a horizontal displacement of ± 250mm, and the unidirectional (DX) can reach ± 150mm, suitable for temperature, shrinkage, creep, and seismic displacement.
Flexible rotation: Vertical angle ≥ 0.02rad (about 1.15 °), can adapt to any angle of horizontal and vertical curves, ensuring smooth rotation of the beam.
Ultra low friction: PTFE skateboard+stainless steel plate, friction coefficient at room temperature ≤ 0.03, minimal slip resistance, protecting the upper structure.
3、 Excellent seismic and energy dissipation capacity (GPZ (KZ) seismic type)
Three level seismic resistance mechanism:
Sliding energy dissipation: When the horizontal force exceeds the vertical bearing capacity by 20%, the energy dissipation plate slides to dissipate seismic energy.
Damping energy dissipation: The built-in damping ring further absorbs energy.
Rigid limit: Rigid structures provide protection under extreme conditions.
Strong horizontal bearing capacity: The horizontal bearing capacity in the non slip direction of the seismic type is ≥ 20% of the vertical bearing capacity (10% for the ordinary type), and the shear and torsional performance is greatly improved.
4、 Compact structure, economical and efficient
Low building height: The compact design of steel basin, rubber, and sliding plate significantly reduces the support height, saving pier materials and space.
Lightweight and cost-effective: Compared to large cast steel bearings, it requires less steel, is easy to process, and reduces overall costs by more than 30%.
Complete types: GD (fixed), DX (unidirectional), SX (bidirectional), can be flexibly combined and arranged to meet the stress requirements of the entire bridge.
5、 Good durability and maintenance free
Sealing protection: multi-layer sealing ring+dust ring, waterproof, dustproof, anti-corrosion, protecting the internal rubber and sliding surface.
Strong environmental adaptability: normal temperature type (-25 ℃~+60 ℃), cold resistant type (-40 ℃~+60 ℃), covering all climate zones in China.
Long lifespan: Under normal usage conditions, the design lifespan is ≥ 50 years, with minimal daily maintenance.
6、 Wide applicability
Suitable for various types of bridges such as highways, railways, municipal engineering, and water conservancy, especially for large-span continuous beams, cable-stayed bridges, suspension bridges, and projects in high-intensity earthquake zones.
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