A combined cofferdam structure and construction method

Abstract

The invention provides a combined cofferdam structure and a construction method. The combined cofferdam structure adopts the scheme that the combined cofferdam structure comprises a cofferdam, and is characterized in that the cofferdam consists of a plurality of spaced inner row piles and a plurality of outer row piles, wherein each outer row pile is arranged between every two adjacent inner row piles, is tangential with the corresponding two inner row piles at the two sides and is positioned at the outer sides of the corresponding two inner row piles, each inner row pile is lower than the corresponding outer row pile, a vertical reinforced concrete cast-in-place wall plate is arranged at the top end of each inner row pile in a foundation pit in a continuous closing way, and a cofferdam inner support system is arranged in the cofferdam. The combined cofferdam structure has the advantages that the cofferdam row piles can be simultaneously constructed together with a main structure, so the construction period is greatly shortened; the soil inserting depth of each cofferdam row pile is easily controlled, and the good embedding depth is reached; the inner row piles are tangential with the corresponding outer row pile, so the good safety and stability are realized; the row piles are arranged in the tangential way, and a cementing body is formed between the pile concrete and the surrounding soil of the cofferdam, so the water closing property is good.

Description

technical field [0001] The invention relates to foundation pit cofferdam construction in the fields of buildings and bridges, in particular to a combined cofferdam structure and construction method. Background technique [0002] At present, in large-scale projects such as buildings and bridges, in order to improve the safety and stability of the structure, there are high requirements for the size and embedding depth of the foundation structure. The selection of the foundation pit cofferdam structure is particularly important, which directly affects the construction safety, Quality, construction period and cost and other aspects. Conventionally adopted foundation pit cofferdam structures and construction methods, such as sheet pile cofferdams, steel casing cofferdams, concrete underground diaphragm wall cofferdams, etc., cannot meet the requirements in terms of applicability, construction cost, construction period, and cofferdam safety. Very high effect. Especially in the c...

AI Technical Summary

Problems solved by technology

Conventionally adopted foundation pit cofferdam structures and construction methods, such as sheet pile cofferdams, steel casing cofferdams, concrete underground diaphragm wall cofferdams, etc., cannot meet the requirements in terms of applicability, construction cost, construction period, and cofferdam safety. high effect

Especially in the construction of cofferdams such as deep foundation pits, deep-water foundation pits, and complex geology, if the process control is not in place, major accidents such as water seepage and cofferdam deformation are prone to occur, which directly affect construction safety; at the same time, to a large extent Seriously restrict the project duration and affect the project cost

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