Construction Method of Combined Cofferdam Suitable for Deep Foundation Pit in Weak Geology

Abstract

The invention discloses a construction method of a combined cofferdam suitable for a weak geology deep foundation pit and relates to the field of bridge construction. The construction method includes the following steps that the construction position of the concrete cofferdam is set out and positioned; base replacement is conducted on the construction position; supporting sole timber and steel blade feet are laid, rebars are tied, the concrete cofferdam is poured, and anchor rebars are installed on the top face of the concrete cofferdam; a first inner support is installed in the concrete cofferdam; the concrete cofferdam is made to sink; steel plate piles are installed on the top face of the concrete cofferdam, a second inner support is installed in the steel plate piles, the second inner support is fixed to the anchor rebars, and a third inner support is installed above the second inner support; the concrete cofferdam is made to sink continuously to design elevation. The combined cofferdam can meet the structural stress requirement; environmental pollution of construction waste, dust, noise and the like generated when the concrete cofferdam is detached is avoided; green construction is facilitated; construction progress is effectively accelerated; the construction cost is saved.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a construction method for a combined cofferdam suitable for deep foundation pits in weak geological conditions. Background technique [0002] Traditional deep foundation pit support and protection structures generally include steel sheet piles, concrete cofferdams, steel pipe piles, etc. Both steel sheet piles and steel pipe piles can be reused, easy to insert and pull out, and convenient and fast to construct. As the depth of the foundation pit increases, the flexibility of steel sheet piles and steel pipe piles increases. For weak geological foundation pits with large excavation depths, the anchorage sections of steel sheet piles and steel pipe piles are difficult to meet the structural force requirements; the concrete cofferdam structure The stress situation is good, but there are problems such as long sinking period, high cost, difficult demolition in the later stage, and u...

AI Technical Summary

Problems solved by technology

[0002] Traditional deep foundation pit support and protection structures generally include steel sheet piles, concrete cofferdams, steel pipe piles, etc. Both steel sheet piles and steel pipe piles can be reused, easy to insert and pull out, and convenient and fast to construct. As the depth of the foundation pit increases, the flexibility of steel sheet piles and steel pipe piles increases. For weak geological foundation pits with large excavation depths, the anchorage sections of steel sheet piles and steel pipe piles are difficult to meet the structural force requirements; the concrete cofferdam structure The stress situation is good, but there are problems such as long sinking period, high cost, difficult demolition in the later stage, and unfavorable green construction

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