Construction method of opening locked steel tube pilecofferdam

Abstract

A construction method of the locking steel pipe pile cofferdam can be carried out according to the following procedures: first is the processing of the steel pipe pile: a female thread and a male thread are fabricated on the spiral pipe; second is that steel pipe piles are connected mutually into an integrated steel pipe pile along the surrounding of the pile cap from beginning to end, all of which are lifted to the place and settled to the designed location by machine; third is grouting of the locking: the locking place of the female thread and the male thread is lined with a clothe bag and the slurry is poured into the bag; fourth is that a support in a cofferdam is arranged; final is that the concrete pouring of a sealing bottom is carried out. The invention has the advantages and the positive effects as follows: 1. flexible connection and being suitable for the assembly of various cofferdams; 2. large section strength and stiffness, and simple and convenient support; 3. simple processing and no need of the large-scale machinery and equipment, no requirement of large-scale floating facilities, and synchronized installation with the pile foundation work; 4. convenient operation and no limitation of the deepwater and the sludge; 5. sufficient rigidness which meet the settlement stiffness and strength with machinery; 6. strong leak tightness.

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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