A Drilling Method with Pipe in Deep Overburden

Abstract

The invention discloses a deep cover layer pipe drilling method comprising the following steps: drill hole formation through one-time pipe drilling is performed by at least two types of drilling tools, an operation hole encircled by lowered pipes is formed, and deep cover layer grouting is performed through the operation hole, wherein pipes of at least two materials are lowered in the period of drill hole formation through one-time pipe drilling by at least two types of drilling tools. Drill hole formation through one-time pipe drilling is realized, repeated drilling is avoided, the efficiency of construction is improved greatly, the occurrence of hole fault is avoided effectively, the occurrence of pipe breakage is reduced effectively, the construction cost is lowered, and smooth completion of a project is ensured.

Description

technical field [0001] The invention relates to the field of flow stages, in particular to a deep covering layer and pipe drilling method. Background technique [0002] Overburden foundation treatment is usually carried out by drilling and grouting, which is widely used in water conservancy and hydropower projects, urban rail transit projects, municipal public utilities and other projects. Drilling, as one of the important processes, is closely related to the progress, quality and construction cost of the project. At present, in order to solve the problems of slow drilling and hole wall collapse, the overburden foundation mostly adopts the tunnel drilling process, but for the deep overburden foundation Generally speaking, the use of traditional follow-up pipe drilling technology often causes follow-up pipe breakage accidents, mainly in the following categories: 1. During the drilling construction process, with the increase of drilling depth, the friction force of the pipe wa...

AI Technical Summary

Problems solved by technology

Drilling, as one of the important processes, is closely related to the progress, quality and construction cost of the project. At present, in order to solve the problems of slow drilling and hole wall collapse, the overburden foundation mostly adopts the tunnel drilling process, but for the deep overburden foundation Generally speaking, the use of traditional follow-up pipe drilling technology often causes follow-up pipe breakage accidents, mainly in the following categories: 1. During the drilling construction process, with the increase of drilling depth, the friction force of the pipe wall increases, and the follow-up pipe The load will increase accordingly. When drilling into the overburden pebble foundation, the drill will be stuck if you are not careful. If you do not deal with it in time and continue drilling, the follower pipe may break; The connecting part of the pipe and the heel pipe is connected by a screw, which is the weak part of the whole heel pipe. Long-term repeated use causes certain quality defects in this part, and a large pull-out force may easily cause the heel pipe to break; 3. During drilling construction During the process, the verticality of the drilling hole was not well controlled, and deviation occurred, and the deviation correction measures were not taken in time, resulting in the bending of the drilling hole and the fracture of the follower pipe

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