The height from the bridge deck of 5th main pier to ground surface is about115m, and the depth from the top surface of pier cap to water surface is 65m. Reinforcement measures such as flaw detection by frogman, hole plugged, steel caisson placing, steel caisson modeling, high performance concrete seal cracks perimeter. Reinforcement show that, the effect of high-pressure water jet roughening and hole plugged is well; the steel caisson which weighs about 400t sinking stablely and reaching the intended design location; great liquidity, high performance concrete has good workability , 28d strength is above the design and specification demands, bridge static and dynamic tests meeting the design requirements. The research is important for bridge strengthening, and provides reference for the reinforcement design and construction of the same type bridge.
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