Construction method of lock catch steel pipe pile cofferdam suitable for thin covering layer hard riverbed

Abstract

The invention discloses a construction method of a lock catch steel pipe pile cofferdam suitable for a thin covering layer hard riverbed. The construction method comprises the following steps that guiding is carried out on a steel platform by using a positioning guide plate, holes are guided by using a steel sleeve, lock catch steel pipe piles are inserted after the holes are guided, the adjacent lock catch steel pipe piles are connected through lock catches, and then soft consolidation treatment is carried out on the lock catch steel pipe piles, groove sealing concrete is poured on the inner side of the lock catch steel pipe piles, groove sealing medium-coarse sand is backfilled on the outer side of the lock catch steel pipe piles, a triangular bracket, an enclosing purlin and an inner support are installed, concrete is poured for sealing the bottom after foundation cleaning, a bearing platform and a pier body are constructed in a cofferdam, then medium-coarse sand is backfilled between the lock catch steel pipe piles and the bearing platform, finally the cofferdam is dismantled, and the lock catch steel pipe piles are subjected to soft solidification in guide holes. According to the construction method, water seepage into the cofferdam can be avoided, the pile bodies are backfilled with medium-coarse sand, the strength of the cofferdam under the thin covering layer hard riverbed condition is improved, the lock catch steel pipe piles can be repeatedly used and are convenient to disassemble and assemble, the construction progress can be improved, and the construction difficulty is reduced.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method for locking steel pipe pile cofferdams suitable for hard riverbeds with thin covering layers. Background technique [0002] The cofferdam is a temporary enclosure structure built for the construction of permanent water conservancy facilities in water conservancy projects. Its function is to prevent water and soil from entering the construction site of the building, so as to drain water in the cofferdam, excavate the foundation pit, and build the building. At present, the commonly used cofferdam structures in water mainly include Larsen steel pipe pile cofferdam and steel casing cofferdam. Under the condition of thin overburden and hard riverbed, Larsen steel pipe pile cofferdam has low rigidity and is easy to deform during construction. Long steel pipe piles are easy to break out during construction, and it is difficult to drive into...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technical problems of difficult construction and high cost under the condition of thin overburden and hard riverbed in the prior art, the present invention provides a construction method of locking steel pipe pile cofferdam suitable for thin overburden and hard riverbed

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