Three-shaft mixing pile sleeving driving reinforced concrete cast-in-place pile foundation pit support construction method

Abstract

The invention belongs to the building field and particularly relates to a three-shaft mixing pile sleeving driving reinforced concrete cast-in-place pile foundation pit support construction method. The method comprises the following steps of conducting construction layout; excavating grooves; arranging a three-shaft pile machine in place, and conducting debugging; mixing cement slurry, starting anair compressor, and feeding the slurry to a pile machine head; spraying the slurry and gas through a drill bit, cutting a soil body, and conducting sinking to reach the designed pile bottom elevation; spraying the slurry and gas, and conducting lifting to reach the designed pile top elevation; constructing a second row of mixing piles through the same method; conducting maintenance for a week; and conducting sleeving driving construction on the cast-in-situ bored piles. By means of the method, the problems that the maximum effective depth of a two-shaft mixing pile waterproof curtain is insufficient, and an enclosing structure construction site is severely limited are effectively solved.

Description

technical field [0001] The invention belongs to the field of construction, and in particular relates to a construction method for protecting a foundation pit with a three-axis stirring pile casing and driving a reinforced concrete pouring pile. Background technique [0002] In recent years, with the wide application of high-rise buildings, the conventional method for the enclosure structure in deep foundation pits in soft soil layers is to retain soil with pouring piles and double-row two-axis mixing piles to stop water, but the site is small, especially in cities where buildings are densely packed. When the enclosure structure site of the district cannot meet the requirements of adding cast-in-situ piles and double-row two-axis mixing piles, there will be problems such as insufficient maximum effective depth of the water-stop curtain of the two-axis mixing piles and severe limitations on the construction site of the enclosure structure. And put forward a kind of three-axis ...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the wide application of high-rise buildings, the conventional method of enclosure structure in deep foundation pits in weak soil layers is to retain soil with pouring piles and double-row two-axis mixing piles to stop water, but in small sites, especially in cities where buildings are densely packed When the enclosure structure site in the district cannot meet the requirements of adding cast-in-place piles and double-row two-axis mixing piles, there are problems that the maximum effective depth of the water-stop curtain of the two-axis mixing piles is insufficient and the construction site of the enclosure structure is seriously limited.