Where are pot type rubber bearings suitable for railway rail transit bridges
Core advantages of pot type rubber bearings: large load-bearing capacity, large horizontal expansion displacement, flexible rotation, weather resistant sealing, and ability to withstand repeated train impact braking force. They are specifically designed for heavy-duty, large-span, and complex deformation railway bridges that plate bearings cannot meet. They are suitable for four major scenarios: c
Core advantages of pot type rubber bearings: large load-bearing capacity, large horizontal expansion displacement, flexible rotation, weather resistant sealing, and ability to withstand repeated train impact braking force. They are specifically designed for heavy-duty, large-span, and complex deformation railway bridges that plate bearings cannot meet. They are suitable for four major scenarios: conventional railways, high-speed/intercity railways, subway and light rail elevated systems, and special working conditions.
1、 Applicable bridge span and beam type (railway mainline)
1. Simply supported beam bridge (20-40m standard T-beam, box beam, channel beam)
Universal TPZB/TBZB series bowl shaped supports for standard simply supported box girders on high-speed railways with mixed passenger and freight lines;
Plate bearings have a low upper limit of bearing capacity and insufficient expansion and contraction. For railway simply supported beams over 20m, basin type bearings are preferred;
Each span has a fixed support (GD) at one end and a unidirectional movable support (DX) at the other end.
2. Continuous beam bridge (30-120m multi span continuous box girder)
Mainstream application scenarios for high-speed rail and intercity railway mainlines;
The temperature deformation is large, and the longitudinal expansion and contraction of the beam can reach ± 100-250mm, relying on PTFE sliding plates to achieve large displacement;
Each pier is equipped with only one fixed pot type support, while the remaining piers are equipped with one-way movable supports.
3. Continuous rigid frame, V-shaped pier, large-span special railway bridge
Cross river, cross valley, and high pier railway bridges have a large vertical reaction force on a single pier (3000kN~50000kN);
The steel basin restrains the rubber in three directions of compression, preventing lateral bulging and crushing of the plate support, and stably transmitting train live load, braking force, and wind load.
2、 Full coverage of rail transit line types
1. Bridge for ordinary speed mixed passenger and freight railway
Heavy load freight and mixed operation lines have high impact loads and horizontal braking forces on trains;
The bowl shaped support has strong horizontal shear resistance and can withstand the huge horizontal force generated by emergency braking of the train;
Suitable for straight, sloping, and flat curved bridges.
2. Bridges for high-speed railways and intercity passenger dedicated lines
Ballastless elevated track, long continuous beam, cross highway interchange, and cross river super large bridge;
Require low friction, low vibration, and durability for 100 years, and the steel basin sealing rubber should not be corroded by rainwater and dust;
Cold resistant type (-40 ℃ low temperature non hardening) can be selected in high-altitude regions.
3. Subway, urban light rail, and straddle type monorail elevated bridges
Elevated box girders and ramp curved bridges for urban rail transit;
Daily high-frequency train reciprocating impact, rubber enclosed in a steel basin is not easily aged;
Curves and interchange ramps use bidirectional movable bowl shaped supports (SX), which can accommodate both longitudinal expansion and lateral radial displacement.
3、 Special linear and complex load-bearing bridge scenes
Curved railway bridge, diagonal beam, wide box girder
The beam body exhibits longitudinal expansion, transverse radial displacement, and beam end torsion simultaneously; The bi-directional movable bowl shaped support releases displacement in two directions to avoid support jamming and beam cracking.
Ramp railway bridge (uphill/downhill)
The fixed supports are uniformly arranged on the downhill bridge abutment, and the bowl shaped supports can stably transmit the force along the slope direction without easy sliding.
Tied arch bridge, railway cable-stayed bridge approach bridge, stiffening beam support
Large tonnage vertical load+wind-induced reciprocating displacement, spherical bowl shaped support suitable for small multi-directional angles.
4、 Special Environment and Seismic Conditions
Bridges in high-intensity earthquake zones (seismic fortification of 7-8 degrees)
Choose seismic basin type supports (GPZ-KZ) with built-in damping/lead core energy dissipation structures to absorb seismic energy and reduce the risk of beam falling; The railways in Sichuan Tibet and western mountainous areas are extensively used.
Coastal salt spray, rainy and humid factory areas/port railway bridges
The steel basin can be hot-dip galvanized, epoxy zinc rich anti-corrosion, and the internal rubber is completely sealed to resist chloride ion corrosion, which is superior to exposed plate supports.
Railway in high-altitude regions with large temperature differences between day and night
Divided into room temperature type (-25 ℃~60 ℃) and cold resistant type (-40 ℃~60 ℃), the rubber elasticity does not decay at low temperatures, and rotation and sliding are not affected by freezing resistance.
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