Fore shaft steel pipe pile cofferdam and construction method thereof

Abstract

The invention discloses a fore shaft steel pipe pile cofferdam and a construction method thereof, and relates to the field of bridge engineering. The cofferdam comprises a plurality of fore shaft steel pipe piles connected sequentially and closely. Inner supports are arranged in a foundation pit defined by the multiple fore shaft steel pipe piles. A bored pile is arranged in the cofferdam. The cofferdam further comprises concrete sand cushions. The concrete sand cushions are arranged between the inner supports and the fore shaft steel pipe piles. The method comprises the following steps that the inner supports are assembled, and the inner supports needing to be lowered are fixed to a hoisting system; the inner supports needing to be lowered are lowered to a design position through the hoisting system; and the concrete sand cushions are constructed between the fore shaft steel pipe piles and the inner supports. The concrete sand cushions are arranged between the fore shaft steel pipe piles and the inner supports, the bearing capacity between the fore shaft steel pipe piles and the inner supports is improved, construction is convenient, and the construction efficiency is high.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a locking steel pipe pile cofferdam and a construction method thereof. Background technique [0002] At present, the traditional installation method of the internal support of the lock steel pipe pile cofferdam is: the internal support is assembled on the construction platform or the ground according to the design requirements. Then, use the hanging equipment to put it in place, and then insert and drive the locked steel pipe piles to complete the cofferdam construction. When assembling with this method, if the number of inner support layers is greater than or equal to 2, the overall height of the structure is usually between a few meters and more than ten meters. The height is relatively high, and the construction operation is more inconvenient, which affects the construction efficiency. [0003] In addition, since the interlocking steel pipe pile is a thin-walled circular pip...

AI Technical Summary

Problems solved by technology

If the method of inserting steel plate pads is used, the effect is limited. If the load on the outside of the cofferdam is large, it will still cause local instability of the steel pipe piles, and it is inconvenient to copy; The method of inserting concrete blocks has great limitations. When the locked steel pipe piles are buried deep in the soil and the poured concrete is below the soil surface, the soil inside the pipe piles needs to be taken out before implementation. The process is complicated, time-consuming and laborious.

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