Drilling and grouting integrated top-down high-pressure impact extrusion grouting method

Abstract

The invention discloses a drilling and grouting integrated top-down high-pressure impact extrusion grouting method, which is mainly applicable to conduct foundation strengthening and anti-seepage grouting treatment on poor geologic bodies with loose and weak structures. A spiral sealing high-pressure impact extrusion grouting head is adopted according to the specification of a drilling and grouting hole; grouting liquid is adopted as flushing liquid; pulse mud jacking is conducted at the bottom of the hole by a grouting pump; drilling and grouting integrated top-down high-pressure impact extrusion grouting is conducted on a stratum by the action of the spiral sealing high-pressure impact extrusion grouting head, and slag can be discharged and a drill hole wall can be protected while the grouting is conducted. According to the grouting method, the whole grouting hole is continuous and uniform, the technological operation is simple and convenient, and the grouting method is economical and environmental-friendly. Hole arrangement methods with different hole pitches can be adopted according to different engineering requirements, so as to achieve an ideal grouting quality effect.

Description

technical field [0001] The invention relates to the field of foundation reinforcement and anti-seepage treatment grouting, specifically a method of drilling and pouring integration, top-down, high-pressure flushing grouting, which is mainly suitable for foundation reinforcement and grouting of unfavorable geological bodies such as loose and weak structures. Anti-seepage grouting treatment can be widely used in hydropower, municipal, railway and highway bridges, ports, airports and other fields for foundation reinforcement and anti-seepage grouting treatment for loose, weak and other unfavorable geological bodies. Background technique [0002] There are huge thick calcareous conglomerate (K 1-1 ), mostly in the form of full to strong weathering, with a composite structure of fragments and gravel, uneven hardness and density, and a water permeability of 10-50 Lu with medium water permeability, belonging to Type IV ~ V rock mass. Chinese patent application CN102535472A disclos...

AI Technical Summary

Problems solved by technology

[0004] 1. It is easy to break down into sand and gravel during drilling, and the wall of the drilling hole is very unstable;

[0005] 2. Part of the orifice closed grouting is prone to splitting and it is difficult to pressurize;

[0006] 3. Grouting is prone to "horizontal cake" and the problem of invalid perfusion is prominent;

[0007] 4. It is difficult to construct a qualified curtain with conventional curtain cloth hole structure

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