Construction method of opening locked steel tube pilecofferdam

Abstract

A cofferdam construction method of locking steel pipe piles, which is carried out in accordance with the following steps: ①Processing steel pipe piles: respectively processing a female buckle and a male buckle on a spiral pipe; Lift the steel pipe columns one by one to the design position, and then use mechanical aid to sink to the design position; ③ grouting at the lock; line the lock of the male buckle and the female buckle with a cloth bag, and fill the bag with slurry; ④ Set up the inner support of the cofferdam; ⑤ Pouring concrete for the bottom cover. The present invention has the following advantages and positive effects: 1. The connection is flexible and can be used for various forms of cofferdam assembly. 2. High section strength and rigidity, simple and convenient support. 3. The processing is simple, no large-scale machinery and equipment is required, no large-scale floating facilities are required, and it can be carried out simultaneously with the pile foundation construction. 4. Easy to operate, not restricted by deep water and silt. 5. It has enough rigidity to meet the rigidity and strength of mechanical sinking. 6. Strong sealing.

Description

Technical field: [0001] The invention relates to a construction technology of a bridge pier cofferdam, in particular to a construction method of a locking steel pipe pile cofferdam. Background technique: [0002] For bridge piers with large and rectangular caps, they cannot form a stable force-bearing structure to resist external forces like circular cofferdams. Therefore, if ordinary steel sheet pile cofferdams are used, the denseness of the internal support makes the construction impossible. Moreover, due to the deep insertion depth and pumping depth, the internal and external water side pressure is relatively large, and the flexural modulus of the steel sheet pile cofferdam It is far from meeting the required cross-sectional resistance moment; if a steel box cofferdam is used, a large amount of steel, a large construction site, large transportation, lifting equipment and an assembly platform are required. Due to the limitation of navigation conditions and floating crane ...

AI Technical Summary

Problems solved by technology

Therefore, if ordinary steel sheet pile cofferdams are used, the denseness of the internal support makes the construction impossible. Moreover, due to the deep insertion depth and pumping depth, the internal and external water side pressure is relatively large, and the flexural modulus of the steel sheet pile cofferdam It is far from meeting the required cross-sectional resistance moment; if steel box cofferdams are used, a large amount of steel, large construction sites, large transportation, lifting equipment and assembly platforms are required

Due to the limitation of navigation conditions and floating crane equipment, it is difficult for large tugboats and floating crane equipment to enter the pier construction site, so it is also difficult to use steel box cofferdams

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