Bridge preloading refers to the preloading test of the bridge load when the bridge is built. And check the strength, stability and safety of the support and foundation to ensure construction safety; Eliminating the influence of foundation inelastic deformation and support inelastic deformation is beneficial to the control of bridge deck alignment. Traditional method: iron cans or solid weights are stacked on the bridge for actual pressure test. However, these materials are dense, difficult to transport and move, and the test cost is high, so it is not suitable for transportation.
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Development of preloading of Cast-in-situ Continuous Box Girder Support
1. Reasons for preloading
Check the safety of supports to ensure construction safety;
Eliminating the influence of foundation inelastic deformation and support inelastic deformation is beneficial to the control of bridge deck alignment.
2. The first generation: ton bag preloading
Advantages: the pressing weight can be guaranteed;
Disadvantages: high cost, poor safety, cumbersome lifting, slow speed, and the ton bag can be reused up to 5 times;
Scope of application: no water, small volume, convenient sand taking.
3. Second generation: Precast concrete
Advantages: the pressing weight can be guaranteed;
Disadvantages: high cost, good safety, cumbersome transportation and high reuse rate;
Scope of application: large quantity and advanced transportation distance.
Third generation: rubber water bag / PVC water bag
Advantages: safe, convenient and low cost;
Disadvantages: unable to reach the design preloading weight;
Scope of application: rich water source and difficult lifting.
Fourth generation: open water bag (Wuhan suanda company leads the marketization)
Fifth generation: Reinforced PVC water bag (invented by Wuhan suanda company)
Advantages: safe, convenient and low cost;
Disadvantages: construction personnel need a strong sense of responsibility;
Scope of application: abundant water source.
Sixth generation: rubber water bag (developed by Wuhan suanda company)
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