Comprehensive shaft sinking method of positive and raising boring for vertical shaft

Abstract

The invention discloses a comprehensive shaft sinking method of positive and raising boring for a vertical shaft, which comprises the following steps: drilling into a bedrock section by utilizing a vertical shaft drill machine, forming surface soil section well holes, discharging rock-debris-containing slurry produced during the well drilling process to the ground at high speed through air lifting; prefabricating sections of well walls on the ground; adding counter weight water in the drill well, slowly sinking the sections of well walls to the surface soil section well holes by utilizing buoyancy force of slurry to the well walls in the drill well, and sequentially welding the well walls to the surface soil section well holes; filling grout between the well walls and the rock sides on the outer sides of the well walls, filling cement paste in the lowest layer, then alternatively filling upwards the cement paste and rubbles layer by layer, and obtaining a surface soil section drill well; selecting a suitable raise-bore drilling machine according to practical requirements of the diameter and depth of a bed rock section shaft; lowering the raise-bore drilling machine and fixing the raise-bore drilling machine at the bottom of the surface soil section drill well; inversely expanding the holes by utilizing the raise-bore drilling machine to form bing-holes; and the diameter of the bing-holes is enlarged to preset shaft diameter. The comprehensive shaft sinking method of the positive and raising boring for the vertical shaft greatly improves well forming speed of shaft sinking and is safe, reliable and low in construction cost.

Description

technical field [0001] The invention relates to the field of well drilling, in particular to a comprehensive drilling method for forward and reverse shafts. Background technique [0002] Mine shaft sinking is a fully mechanized comprehensive sinking process. The staff work on the ground to achieve drilling without going down the shaft. The construction process includes 1) crushing, carrying, conveying and separation of stratum rock and soil; 2) expanding the well step by step; 3) temporary support for the side of the well; 4) permanent support including making the well wall, suspending sinking, filling behind the wall, Grouting etc. The rotary table of the large-diameter drilling rig arranged on the ground is used to drive the drill pipe, and the drill pipe drives the drill bit to rotate, and the hob on the drill bit realizes self-rotation and revolution. Afterwards, after several times of expanding the well and correcting the deviation and deviation of the well, when the ...

AI Technical Summary

Problems solved by technology

The existing mine shaft sinking technology has a fast construction speed and low construction cost for drilling the topsoil section, but there are many problems in the construction of the bedrock section: long equipment occupation time, high engineering cost; low work efficiency, low well completion speed Slow, unable to meet the needs of rapid well construction

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