Controllable grouting method for valve pipe sleeving method of deep and thick cover layer

Abstract

The invention discloses a controllable grouting method for a valve pipe sleeving method of a deep and thick cover layer. The controllable grouting method comprises the following steps that one-time forming of a drill hole is achieved by follow-pipe drilling, and by using follow-pipes which are synchronously placed down into the drill hole, an operating hole is formed; a valve pipe sleeving assembly is arranged inside the operating hole; a shell sleeving sizing agent is poured into annular gaps between the valve pipe sleeving assembly and the follow-pipes until the shell sleeving sizing agent overflows out of hole openings; after the shell sleeving sizing agent is poured, the follow-pipes are taken out of the drill hole, and the shell sleeving sizing agent is made to be in contact with a ground layer; before the complete condensation of the shell sleeving sizing agent, by sectionally plugging grouting plugs into the valve pipe sleeving assembly from top to bottom in a clamped mode, a grouting sizing agent from grout outlet holes of the valve pipe sleeving assembly is poured into the ground layer through the shell sleeving sizing agent; when the grouting sizing agent is being poured into the ground layer, by pouring grouting sizing agents with different concentrations, the controllable composite grouting is implemented. According to the controllable grouting method, the hole fault rate is effectively prevented from occurring, the pouring volume of the sizing agents is accurately controlled, the construction efficiency is improved, the using amount of raw materials is effectively reduced, and the cost is saved.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, in particular to a controllable grouting method for deep overburden layers with a valve casing method. Background technique [0002] With the rapid development of domestic water conservancy and hydropower projects, rail transit projects, and municipal engineering construction, the field of foundation treatment has been rapidly expanded, and the scope, depth, and stratum structure of the treatment have become complex and diversified. The grouting reinforcement treatment is the most complicated. At present, for the treatment of deep overburden, the bedrock grouting treatment process has been used in China, that is, drilling while grouting, top-down, and segmented construction methods. The following defects: the hole inclination is difficult to control, resulting in a low hole formation rate, resulting in repeated construction, severe wear, increased construction costs, a...

AI Technical Summary

Problems solved by technology

At present, for the treatment of deep overburden, the bedrock grouting treatment process has been used in China, that is, drilling while grouting, top-down, and segmented construction methods. The following defects: the hole inclination is difficult to control, resulting in a low hole formation rate, resulting in repeated construction, severe wear, increased construction costs, and slow progress; due to the difficulty in controlling the amount of grout poured, it is difficult to accurately identify the leakage site; The secondary grouting repeatedly splits the grouted upper strata, which is likely to cause the surface to lift, and the grouting quality is difficult to guarantee

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