Treatment method for grouting sand-layer foundation on the condition of flowing water

Abstract

The invention discloses a treatment method for grouting a sand-layer foundation on the condition of flowing water, comprising the following steps: 1. adopting a spindle swing rig to process a plurality of grouting holes which are partially overlapped on the strengthened sand-layer foundation; 2. inserting a grouting pipe into the grouting holes and injecting grouting slurry which is formed by the mixing of mud or two materials of cement and mud to the sand-layer foundation on the condition of flowing water from the grouting pipe; 3. directly injecting pure cement slurry into the same one drilling hole or re-adopting the spindle swing rig to process a plurality of grouting holes which are partially overlapped at the position where a first batch of slurry is grouted after the slurry is precipitated and cured, and then inserting the grouting pipe and injecting the pure cement slurry; and 4. using a waterstop to block the grouting holes after the slurry is injected to each grouting hole. Compared with the pure cement slurry, the treatment method for the grouting of a sand-layer foundation on the condition of flowing water has low cost, good flowability and permeability, high concretion rate, simple technology equipment, and convenient operation.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a grouting treatment method for sand foundations under dynamic water conditions. Background technique [0002] At present, conventional grouting methods for sandy foundations include static pressure grouting, deep agitation grouting, and high-pressure jet grouting. After a certain period of time under still water conditions, they can form concretions with high strength and low permeability, so as to achieve the purpose of forming a water-stop curtain and treating soft ground. However, when the sand layer forms dynamic water conditions under the influence of factors such as changes in the groundwater level and groundwater extraction, the current common treatment method is to add admixtures such as water glass to the cement slurry to make the slurry solidify in a short time. Reduce the impact of moving water. This kind of grouting method is difficult, the technical requiremen...

AI Technical Summary

Problems solved by technology

This grouting method is difficult, requires high technical requirements for construction operations, and the construction quality and effect are often not ideal.