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Medium-depth hole large-section combined cutting blasting structure and method

A large-section, deep-hole technology, applied in blasting and other directions, can solve the problem of not considering the impact of blasting, and achieve the effect of reducing labor time, reducing blasting noise and vibration, and reducing damage

Active Publication Date: 2016-02-17
江苏中车城市发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this aspect does not take into account the impact on blasting such as changes in the form of cutting

Method used

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  • Medium-depth hole large-section combined cutting blasting structure and method
  • Medium-depth hole large-section combined cutting blasting structure and method
  • Medium-depth hole large-section combined cutting blasting structure and method

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Embodiment Construction

[0042] Below by embodiment and in conjunction with accompanying drawing, the present invention will be further described:

[0043] Such as figure 1 and image 3 In the medium-deep hole and large-section composite cutting blasting structure, a large-diameter hole 1 perpendicular to the tunnel face is provided at the center of the tunnel excavation face, and a large-diameter hole 1 is provided around the large-diameter hole 1. 4 to 8 slotting holes 2 (ie figure 1 In the hole connected by dotted line A), if the number of cut holes 2 is less than 4, it means that the diameter D1 of the large diameter hole 1 is too large; if the number of cut holes 2 is more than 8, it means The diameter D1 of the large-diameter hole 1 is too small, and the diameter D1 of the large-diameter hole 1 needs to be increased (two or more large-diameter holes can also be used as the initial blasting compensation space). Each cutting hole 2 is distributed in a spiral line around the center line of the l...

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Abstract

The invention discloses a medium-depth hole large-section combined cutting blasting structure and method. A large-diameter hollow hole perpendicular to a face is formed in the lower position of the center of the tunnel piercing face; a plurality of cut holes are formed in the periphery close to the large-diameter hollow hole; all the cut holes are spirally distributed with the center line of the large-diameter hollow hole as the center; the length of each cut hole gradually increases from inside to outside along the spiral line; the cut holes are inclined holes of which the inner ends are inclined towards the center line of the large-diameter hollow hole; multiple peripheral holes and multiple bottom board holes which are distributed along the outer contour of the face are formed in the tunnel piercing face and used for controlling the contour of the face after blasting; two rows of auxiliary holes are formed between the peripheral holes and the cut holes; one row of auxiliary holes are formed between the cut holes and the bottom board holes; water bags, explosive and detonators are arranged in the cut holes, the auxiliary holes, the peripheral holes and the bottom board holes. The blast-shaking speed is decreased, blasting explosive payload and labor amount of workers are reduced, and meanwhile damage to surrounding rocks is small.

Description

technical field [0001] The invention relates to underground engineering blasting technology, in particular to a compound cutting blasting structure and method for medium-deep holes and large sections. Background technique [0002] At present, there are two main types of cuts for tunnels excavated by full-face blasting: vertical cuts and inclined cuts. The disadvantage of vertical cutting is that the spacing of the cutting holes, the quality of the drilling holes and the charge are strict, and it is not easy to master. The number of holes required for cutting and the consumption of explosives are relatively large, and the volume of the cutting is small. It is suitable for blasting excavation. Tunnels with small cross-sections; oblique cutting. Because the cutting eye and the tunnel face are obliquely intersected, the cutting is more reliable, the precision of the drilling is not high, and the operation is relatively simple. Common, and the most widely used in the form of wed...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04
CPCF42D1/00F42D3/04
Inventor 杨志刚武相坤冀文有殷立达
Owner 江苏中车城市发展有限公司
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