Cutting a cut and cover blast formed borehole structure and method of construction

By using a borehole structure with open holes and equilateral right-angled triangles, along with segmented micro-delay blasting technology, the problems of high explosive consumption and irregular wellheads in cutting wells were solved, achieving efficient and safe cutting well construction.

CN117287204BActive Publication Date: 2026-07-21GUIZHOU FULIN MINING CO LTD +1
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUIZHOU FULIN MINING CO LTD
Filing Date
2023-09-28
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing methods for constructing cutting wells suffer from problems such as high explosive consumption, poor blasting effect, irregular wellhead, and poor safety, which affect mining efficiency and safety.

Method used

A specific hole arrangement structure is adopted, consisting of hollow holes, a first blast hole, and a second blast hole. The hollow holes serve as the free surface of the first blast hole, providing compensation space for its blasting. The second blast hole is arranged in an equilateral right-angled triangle. Combined with segmented micro-differential blasting technology, a regular cut-out well is formed.

Benefits of technology

It reduced explosive consumption, improved blasting effect and construction safety, ensured the regularity of the cross-section of the cutting well, reduced damage to the surrounding rock, and improved mining efficiency and safety.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN117287204B_ABST
    Figure CN117287204B_ABST
Patent Text Reader

Abstract

The application discloses a cutting roof blast forming hole arrangement structure and a construction method. The cutting roof comprises a roof body and a square roadway, the square roadway is arranged at a corner of the roof body, the hole arrangement comprises a blank hole, a first blast hole and a second blast hole, the blank hole and the first blast hole are arranged in the square roadway, the second blast hole is arranged in the form of an equilateral right triangle in the roof body, the center point of the hypotenuse of the equilateral right triangle coincides with a corner point of the square roadway, and the right angle side of the equilateral right triangle is parallel to the roadway wall of the roof body. The cutting roof obtained by the application has a regular cross section, a good contour, small damage to the surrounding rock of the cutting roadway, is beneficial to the next step of slot drawing and mining, and accelerates the tunneling efficiency. The construction method provided by the application has the advantages of one-time hole forming, full-section blasting, good blasting effect, small explosive unit consumption, improved construction safety, ensured construction quality, reduced construction cost and construction difficulty.
Need to check novelty before this filing date? Find Prior Art