Construction method for precasting concrete moulding bed in local pit of base pit engineering under soft foundation

Abstract

The invention relates to a construction method for local deep-pit prefabricated concrete tire shuttering in the foundation pit engineering under soft soil foundation. The method comprises the following steps that: 1) earthwork is excavated to a large-area deep-pit bottom, and then a cushion layer is poured and tamped; 2) a reinforced concrete tire shuttering is prefabricated in advance according to the planar dimension and the depth of a local deep pit, and the prefabricated reinforced concrete tire shuttering is arranged in the pit when the earthwork at the local deep pit is excavated to the designed elevation; 3) the backfill is performed, and the vacancy filling of the cushion layer at the local deep pit is performed; 4) a large bottom plate and structural reinforcing steel bars in the local deep pit are bound for construction, a deep-pit internal mould is arranged and is fixed with the reinforcing steel bars on the bottom plate, and then structural concrete of the bottom plate is poured and tamped. The method has the advantages that: the method has less process steps, the prefabricated tire shuttering is performed beforehand, and scattered and redundant concrete can be used for pouring and tamping; the construction speed is quick, the construction of the tire shuttering can backfill to bear pressure without waiting for enough strength; the method has less process steps and quick construction speed, which contributes to the stability of the foundation pit; and the reinforced concrete tire shuttering has large strength and rigidity and is not easy to distort, and the quality of the foundation structure is easy to be guaranteed.

Description

Construction Method of Prefabricated Concrete Formwork for Partial Deep Pit in Foundation Pit Engineering Under Soft Soil Foundation technical field The invention relates to the relevant technical field of building construction, and relates to the enclosure and formwork system of the partially lowered deep pit of the foundation floor in the structural construction of industrial and civil buildings and municipal public works, especially a method for excavating large-area excavated foundation pits for local deep pits. During the construction of the pit, the temporary enclosure of the local deep pit and the construction method of the external formwork of the concrete structure in the pit are replaced by prefabricated reinforced concrete tire formwork. Background technique In the construction of industrial and civil buildings and municipal engineering foundations, water collection wells and equipment wells are generally set in the basic structure during architectural design. T...

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Problems solved by technology

The purpose of the present invention is to provide a construction method of prefabricated concrete formwork for local deep pits in foundation pit engineering under soft soil foundation, reduce construction process steps, speed up construction progress, improve the enclosure and formwork system of structural concrete quality, and solve the problem of traditional The construction method of deep pits with partially lowered floors has many technological steps, slow construction speed, and poor construction quality

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