Great drop mountain directional drilling crossing construction method

Abstract

The invention discloses a great drop mountain directional drilling crossing construction method, comprising the following process steps: 1) determining a soil coming-in position and a soil coming-outposition, through a drilling tool, drilling along the direction from the soil coming-in position to the soil coming-out position, to realize construction processing of a guide hole; 2) withdrawing thedrilling tool along the direction from the soil coming-out position to the soil coming-in position, after the drilling tool is changed to a hole expanding device, through the hole expanding device, drilling along the direction from the soil coming-in position to the soil coming-out position, to realize hole expanding construction processing; 3) in the hole in which hole expanding construction processing is completed, placing a pipe which is to be laid in the hole along a drag direction from the soil coming-out position to the soil coming-in position, the pipe being dragged by the hole expanding device. Compared with a conventional directional drilling process, in the great drop mountain directional drilling crossing construction method using the above technical scheme, pushing processingof the hole expanding device from the soil coming-in position to the soil coming-out position is used in a hole expanding stage, control of a guide curve in an operation process can be effectively improved, so that a hole expanding path tends to be a line, and hole expanding precision is improved.

Description

technical field [0001] The invention relates to the field of geotechnical and geological engineering, in particular to a construction method for directional drilling and crossing of a mountain with a large drop. Background technique [0002] Directional drilling, as a major non-excavation technology, has been widely used in complex terrain projects such as various pipelines crossing rivers, highways, railways and mountains. During the directional drilling construction process, it is necessary to ensure that there is enough mud exposed in the forming hole. In the traditional directional drilling construction process, the height difference between the entry position and the excavation position is small, so the mud can be evenly distributed in the hole. During the construction of directional drilling in mountains with a large drop, due to the large drop between the unearthed position and the buried position, it is difficult to obtain sufficient supply of mud inside the hole, wh...

AI Technical Summary

Problems solved by technology

During the directional drilling construction process, it is necessary to ensure that sufficient mud is exposed in the formed hole. In the traditional directional drilling construction process, the height difference between the entry position and the excavation position is small, so the mud can be evenly distributed in the hole. During the construction of directional drilling in mountains with a large drop, due to the large drop between the excavation position and the entry position, it is difficult to obtain sufficient supply of mud inside the hole, which makes the hole prone to insufficient lubrication inside the hole due to lack of mud. Sufficiently, the rock debris generated during the drilling process is difficult to be discharged in time, which affects the construction efficiency and effect of directional drilling