Preparation device and backfilling method for flow-state cement soil

Abstract

The invention discloses a preparation device and backfilling method for flow-state cement soil. The preparation device for the flow-state cement soil comprises a flow-state cement soil preparation pool and cement soil stirring and guniting drill bits. An opening is formed in the upper portion of the flow-state cement soil preparation pool and supporting track guide rails are arranged on the two sides of the top of the flow-state cement soil preparation pool and provided with supporting frames. The cement soil stirring and guniting drill bits are arranged in the flow-state cement soil preparation pool. One end of each cement soil stirring and guniting drill bit is exposed out of the corresponding supporting track guide rail and connected with a motor and a cement paste conveying pipe through the corresponding supporting frame and the other end of each cement soil stirring and guniting drill bit extends into the flow-state cement soil preparation pool and is used for stirring the cement soil. By the adoption of the preparation device and backfilling method for the flow-state cement soil, replacing and supporting quality is improved, the construction progress is improved at certain degree, and the replacing and supporting effect is good. In addition, the cement soil has certain beneficial influences on basement water resistance.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a fluid cement soil preparation device and a backfilling method. Background technique [0002] With the rapid development of super high-rise buildings, deep foundation pit projects have sprung up like mushrooms after rain. In areas with weak soil such as Tianjin and Shanghai, the supporting form of foundation pits is mostly row piles plus multiple horizontal supports. The horizontal support needs to be replaced and removed step by step with the construction of the basement according to the design conditions. The replacement of braces is mainly to backfill the 3:7 lime soil between the basement exterior wall and the row of foundation pit piles, and pour plain concrete slab strips on the basement foundation floor and floor slab. [0003] The existing support replacement methods have the following problems: First, because the distance between the basement exterior wall and the row...

AI Technical Summary

Problems solved by technology

[0003] The existing support replacement methods have the following problems: First, because the distance between the basement exterior wall and the row of piles is mostly between 800mm and 1000mm, which is relatively small, the construction speed of lime soil backfilling is slow, and the compaction coefficient is difficult to guarantee. The deformation of the foundation pit is relatively large after the support is removed; thirdly, due to site constraints, a circular road cannot be formed around the foundation pit, and it is difficult for the dust to reach the backfill point, and the degree of mechanization is low

Lime soil backfill construction is difficult, the construction period is long, and the quality is not easy to guarantee

Images