Product Description
A Bridge bearing is a component of a bridge which typically provides a resting surface between bridge piers and the bridge deck. The purpose of a bearing is to allow controlled movement and thereby reduce the stresses involved. Possible causes of movement are thermal expansion and contraction, creep, shrinkage, or fatigue due to the properties of the material used for the bearing. External sources of movement include the settlement of the ground below, thermal expansion, and seismic activity.
These bearings are components which allow controlled movement by the bridge, by transferring concentrated forces from one structural member to another one - thereby reducing stress.It has sufficient vertical stiffness to support vertical loads and can transfer the pressure from the superstructure to the bridge abutment.
Working Principle
There is an elastomeric pad in the pot of the pot bearing, it has fluid properties when it in the state of three-phase stressed, making use of this feature can achieve large rotation of the bearing. In addition, when a relative motion occurs between the PTFE plate which placed on the piston and the stainless steel plate, horizontal displacement can be achieved. Pot bearing can meet the requirements of large end reaction, large horizontal displacement and large rotation, it is suitable for the bridge with large span and large end reaction.
Product Feature
Basin type rubber support is a new type of bridge support composed of steel components and rubber. It has the characteristics of high bearing capacity, large horizontal displacement, flexible rotation, light weight, compact structure, simple construction, low building height, easy processing and manufacturing, saving steel, and reducing costs.The Basin type rubber support is composed of upper seat plate, sealing ring, rubber plate, bottom basin, anchor bolts, and dust cover.
Function:
Transferring various loads from the superstructure to the pier, and being able to adapt to the variable position (displacement and corner) generated by factors such as load, temperature change, concrete shrinkage, etc., so that the actual stresses of the upper and lower structure are in accordance with the designed calculation formula.
Replacement
The purpose of bearing replacement is to ensure the long-term stability and safety of the structure. Over time, bearings may experience performance degradation or damage due to various reasons such as material aging, environmental erosion, long-term load effects, etc., which may lead to a decrease in structural load-bearing capacity, stability, and even safety accidents. Therefore, by replacing the new bearings, these potential risks can be eliminated, ensuring that the structure can continue to operate safely and stably.
Specification
Material: steel, elastomer.
Shape: round and rectangular.
Hardness (shore A): 55-65.
Capacity: 1000-70000 kN.
Displacement: 0-300 mm.
Normal temperature type bearing: suitable for -25 °C to 60 °C.
Cold resistant type bearing: suitable for -40 °C to 60 °C.
Certification: CCC, SGS, CE, ISO.
Package: plastic, wooden box.
| Item/Rubber Type |
Neoprene |
Natural Rubber |
EPDM |
| Hardness (shore A) |
60 ± 5 |
60 ± 5 |
60 ± 5 |
| Tensile Strength |
≥17.0 |
≥17.5 |
≥15.2 |
| Elongation at Break |
≥400% |
≥400% |
≥350% |
| Brittleness Temperature |
≤-40 °C |
≤-50 °C |
≤-60 °C |
| Constant EN Compression Set(70 °C, 22 h) |
≤20% |
≤25% |
≤25% |
| Resistance of Ozone Aging(Test Condition: 25-50 pphm, 20% Elongation, 40 °C, 96 h) |
no cracking |
no cracking |
no cracking |
| Air Oven Aging Test |
Test Condition(°C × h) |
100 × 70 |
70 × 168 |
100 × 70 |
| Reduction Rate of Tensile Strength |
<15% |
<15% |
<15% |
| Reduction Rate of Elongation at Break |
<40% |
<20% |
<40% |
| Change of Hardness |
<+15 |
<+10 |
<+10 |
Application, Maintenance and Replacement
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