A multi-stage small wedge-shaped cutting blasting shock absorption method

A technology of wedge-shaped undercutting and undercutting hole, applied in blasting and other directions, can solve the problems of large blasting distance and area of ​​the first section undercutting hole, large blasting clamping effect, poor blasting surface conditions, etc. Empty surface conditions, reducing vibration speed, controlling blasting vibration effects

Active Publication Date: 2018-07-10
CHINA COMM SOUTH ROAD & BRIDGE CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The wedge-shaped cut in the existing squint cut technology has an unreasonable and scientific layout on the face, which is easily limited by the operating range of the construction frame, resulting in a large blasting distance and area of ​​the first cut hole, and the blasting of the empty surface The conditions are poor and the blasting clamping effect is great, which is not conducive to the reduction of blasting vibration

Method used

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  • A multi-stage small wedge-shaped cutting blasting shock absorption method
  • A multi-stage small wedge-shaped cutting blasting shock absorption method

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Embodiment

[0033] In the blasting construction of a certain tunnel, 16 sections of blastholes were set on the tunnel face, the first to eighth sections were cut holes, the ninth to 14th sections were auxiliary holes, the fifteenth section was the peripheral eyehole, and the sixteenth section was the bottom plate eye; the horizontal spacing between sections 1 and 3 is controlled between 45cm and 60cm according to the drilling angle; the horizontal spacing between sections 3 and 5 is 35cm, and the vertical blast hole spacing is evenly arranged and not less than 50cm; sections 11 and 9 , The horizontal spacing between sections 7 and 5 is 60cm, and the vertical blasthole spacing is evenly arranged and not less than 50cm; the blasthole spacing of peripheral holes is 45cm-50cm; the bottom plate hole blasthole spacing is 130cm; the 13th section auxiliary hole blasthole spacing is 80cm; the angle between the slot hole and the face of the first section of cutout is 58°, and the angle gradually inc...

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Abstract

The invention discloses a multi-stage small wedge-shaped cutting blasting shock absorbing method, which mainly includes the following steps: A) arranging several blasting sections on the tunnel surface through a laser pointer and controlling the contour lines of each section; B) controlling each blasting section The angle and depth of blast holes on the section, C) purge and clean the cut holes, auxiliary holes, peripheral holes and bottom plate holes that have been drilled, D) put the emulsion explosive and millisecond nonel detonator into the corresponding cut holes, In the auxiliary eye, the peripheral eye and the bottom plate eye, E) connect each detonator, and detonate according to the order of "cutting eye, auxiliary eye, peripheral eye and bottom plate eye" after confirmation; the present invention changes the existing large wedge-shaped cutting It is a multi-stage small wedge-shaped cut. By controlling the angle and depth of the blast hole on each initiation section and filling the increased initiation section with explosives, the condition of the air surface of the next stage of blasting is improved, thereby reducing the effect of blasting clamping; The vibration speed caused by cutting blasting is reduced, and the blasting vibration is effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of tunnel smooth blasting, and in particular relates to a multi-stage small wedge-shaped notch blasting damping method. Background technique [0002] In tunnel blasting construction, cutting is the most important thing in roadway blasting, and the effect of cutting directly affects the whole blasting effect. In the control of blasting vibration, the blasting vibration of the cut hole is far greater than that of the auxiliary eye and peripheral eyes. It can be said that blasting vibration control is actually controlling the blasting vibration of the cutting hole. The commonly used cutting methods are mainly two types: straight eye cutting and oblique eye cutting. Straight hole cutting is perpendicular to the face of the hole, using the huge function of a group of blasthole charges that are parallel to each other and the eye distance is not large, so that the rock inside the cutting hole is broken or even po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00F42D3/04
Inventor 张永涛齐宏陈松洲李海港
Owner CHINA COMM SOUTH ROAD & BRIDGE CO LTD
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