Why is the JQZ series spherical support suitable for use on urban elevated bridges
Considering the complex load, dense traffic flow, multiple curves/ramps, uneven settlement, high seismic requirements, and limited maintenance in urban elevated bridges, JQZ spherical bearings are highly matched in terms of structural performance, deformation adaptability, durability, seismic resistance, and installation adaptability, as follows:
Considering the complex load, dense traffic flow, multiple curves/ramps, uneven settlement, high seismic requirements, and limited maintenance in urban elevated bridges, JQZ spherical bearings are highly matched in terms of structural performance, deformation adaptability, durability, seismic resistance, and installation adaptability, as follows:
1、 Strong adaptability to corners, suitable for complex urban bridge lines
There are a large number of curved beams, ramp bridges, longitudinal/transverse slopes, and wide box girders in urban elevated bridges, which are prone to vertical turning and torsional deformation of the beam body;
JQZ is a spherical contact structure that can achieve multi-directional free rotation, with a large design angle that can synchronously adapt to beam rotation, warping, and torsion;
Compared to plate type rubber bearings: Rubber bearings have weak turning ability, are prone to detachment and local compression damage at large turning angles, while spherical bearings have no hidden danger of detachment and uniform stress.
2、 Stable load-bearing performance, meeting heavy loads and dense traffic flow requirements
The vertical bearing capacity specification is fully covered, which can be adapted to conventional medium and small tonnage to large-span heavy-duty bridge sections of municipal elevated roads. The cast steel body has high strength and rigidity;
The overall rigid pressure bearing structure has excellent resistance to compression deformation and fatigue, and urban bridges are less prone to aging and collapse under long-term reciprocating vehicle loads and repeated impacts;
Surface contact force transmission, uniform stress distribution, avoiding local stress concentration, suitable for the upper structure of mainstream elevated bridges such as box girders and T-beams.
3、 Multi directional displacement freedom, solving temperature and settlement problems
It can achieve bidirectional horizontal displacement in both the longitudinal and transverse directions of the bridge, easily releasing the displacement caused by temperature expansion, shrinkage, and creep of the concrete beam;
Urban elevated lines are long and divided into multiple sections, and uneven settlement of roadbeds and pile foundations is common. Spherical bearings can offset secondary internal forces through rotation and displacement;
The sliding surface is made of a composite material of stainless steel and polytetrafluoroethylene, with a low coefficient of friction and smooth sliding. The additional internal force of the beam is small, protecting the main structure of the bridge.
4、 Graded seismic design, in line with urban disaster prevention requirements
Standard Class I/II/III seismic resistant models, which can be selected according to the seismic fortification intensity of the city. Fixed bearings and unidirectional bearings have high-strength horizontal shear resistance;
Spherical bearings have a large horizontal bearing redundancy, which can effectively transmit horizontal forces and buffer vibrations under earthquake action, preventing the risk of beam sliding and falling;
Compared to ordinary bearings, it has stronger resistance to lateral displacement and overturning, making it suitable for densely populated urban areas and enhancing the safety reserve of bridges.
5、 Good environmental adaptability and low maintenance cost
Pure steel+wear-resistant sliding components, resistant to aging, high and low temperatures, and rain and water corrosion, unlike rubber bearings that are prone to cracking, aging, and deformation;
Urban elevated roads are mostly exposed to outdoor environments and suffer from severe dust and rainwater erosion. The JQZ support has a complete sealing structure, dust and water resistance, and a longer durability period;
Sturdy structure, low failure rate, uninterrupted urban elevated transportation, minimal maintenance and frequent replacement, reducing road occupation construction and traffic impact.
6、 Excellent installation adaptability and friendly municipal construction
Compact structure, standardized installation dimensions, suitable for narrow cover beams and low pier structures of urban elevated bridges;
Easy installation and debugging, high construction fault tolerance, compatible with various construction processes such as cast-in-place and prefabricated box girders;
It can be customized in various forms, including fixed, one-way, and two-way activities, to meet the combined layout requirements of a multi span bridge.
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