Blasting construction method for freezing shaft and unstable rock stratum

A construction method and technology of freezing wells, which are applied in blasting and other directions, can solve problems such as blasting construction methods in unstable rock formations, slow driving speed, and long drilling and blasting time, so as to improve the regular circulation rate, save material costs, and increase the number of blast holes. Effect

Inactive Publication Date: 2014-08-13
中煤第五建设有限公司第四十九工程处
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a blasting construction method for frozen shafts and unstable ro

Method used

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Embodiment Construction

[0020] The blasting construction method for freezing shafts and unstable rock formations is characterized in that the process steps are:

[0021] Drilling, that is, drilling according to the blasthole depth and diameter set according to the requirements of the blasting process;

[0022] Lower the pipe, install a PVC pipe matching the diameter of the blasthole in the blasthole; immediately lower the pipe after drilling.

[0023] Charging, filling the PVC pipe with explosives and detonators;

[0024] Wiring, connect the detonator detonating wire with the power supply;

[0025] Blast off; connect the detonating power supply to blast.

[0026] The PVC pipe has an inner diameter of Ф47.3mm, an outer diameter of Ф50mm, and a length equal to the blasthole depth plus 200mm to 300mm.

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Abstract

The invention discloses a blasting construction method for a freezing shaft and an unstable rock stratum. The blasting construction method is characterized by comprising the technological steps of (1) punching a hole: the hole can be punched according to blasting hole depth and blasting hole diameter set by a blasting technology requirement; (2) installing a pipe: a PVC (Poly Vinyl Chloride) pipe which is matched with the blasting hole diameter is arranged in a blasting hole; (3) loading explosive: the PVC pipe is internally filled with the explosive and a detonator; (4) connecting a wire: a detonating wire of the detonator is connected with a power supply; (5) blasting: a detonating power supply can be powered on for blasting. Compared with the prior art, the hole wall of the blasting hole is protected by using the PVC pipe, thus the blasting hole quality is ensured, the hole forming of the blasting hole is ensured, and a hole forming rate of the blasting hole is increased; on one hand, the hole forming rate of the blasting hole is effectively increased, and on the other hand, the explosive quality is prevented from being reduced by water entering the blasting hole in a working area.

Description

technical field [0001] The invention relates to a construction method for mine construction, in particular to a blasting construction method for freezing shafts and unstable rock formations. Background technique [0002] In recent years, more and more shafts have been developed in coal mines, but due to geological factors such as water gushing in shafts or unstable rock formations during shaft construction, the construction speed of shafts has been slow and the construction difficulty has increased. In this century, my country's coal mine construction has been transferred to the western mining areas with Shanxi, Shaanxi, Gansu and Mongolia as the main body. The strata that the shaft passes through are mainly Tertiary, Quaternary, Cretaceous and Jurassic sandstone, with well-developed fractures and rich water content. ;Due to geological reasons, the aquifer is mostly a porous aquifer, and the wellbore is mostly constructed by freezing method, ground pre-grouting or working fa...

Claims

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Application Information

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IPC IPC(8): F42D3/04F42D1/00
Inventor 刘彦杰曹忠常范聚朝钟占良赵静张志峰乐立峰李佳
Owner 中煤第五建设有限公司第四十九工程处
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