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Sectional type slotting method

A segmented, grooved surface technology, applied in blasting and other directions, can solve the problems of high utilization rate of blastholes, small number of blastholes, clamping of blasthole blasting, etc., and achieve the effect of improving the cutting conditions and increasing the cutting effect

Pending Publication Date: 2018-12-18
NORTHWEST RES INST OF MINING & METALLURGY INST
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Problems solved by technology

[0002] In the process of tunnel excavation, the arrangement of blastholes is very critical, which determines the quality of the blasting effect of the tunnel excavation. The layout of traditional blastholes is basically divided into two categories, straight hole cutting and oblique hole cutting. Among them, the application of straight hole cutting is compared Extensive; the advantage of oblique hole cutting is that it can effectively throw the rocks within the range of the cutting out of the hole to form a compensation space. The number of blastholes required to form the compensation space is small and the utilization rate of the blastholes is high, but at the same time the accuracy of the blasthole angle is very high. The footage of a single blasting is limited; straight hole cutting is to cut the depth of all blastholes to the same depth, the bottom of all blastholes is parallel, the depth of blastholes is consistent with the depth of excavation, the utilization rate of blastholes is low, and blastholes are prone to blasting clamping, which affects Cutting effect

Method used

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Embodiment Construction

[0019] Such as figure 1 and figure 2 A segmented cutting method shown includes the following steps:

[0020] A square cutout area 1 is set on the tunnel cutout surface, a first set of blastholes 2 are respectively set at the midpoints of the four sides of the square cutout area 1, and a second set of blastholes 3 are respectively set on the four corners of the square cutout area 1, and A compensation hole 4 is set at the center of the square cutting area 1; charges are charged at the bottom of the first group of blastholes 1 and the second group of blastholes 2, and the openings of the blastholes are blocked. The charge length of the first group of blastholes 2 is 1.2m, and the second The charge length of the group of blastholes 3 is 1m, and the plugging length of the holes 5 of the first group of blastholes 2 and the second group of blastholes 3 is 0.6m; the first group of blastholes 1 is detonated first, and the second group of blastholes 2 is delayed by 50ms.

[0021] Th...

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Abstract

The invention relates to methods for tunneling, in particular to a sectional type slotting method. The sectional type slotting method includes the following steps that a square slotting region is arranged on the slotting surface of a tunnel, a first set of blast holes are formed in the midpoints of four edges of the square slotting region, a second set of blast holes are formed in four corners ofthe square slotting region, and a compensation hole is formed in the center of the square slotting region; explosives are placed at the bottoms of the first set of blast holes and the second set of blast holes, and orifices of the blast holes are blocked; and the first set of blast holes are detonated at first, and detonation of the second set of blast holes is delayed. Due to the fact that the depths of the slotting holes are different in the tunneling direction in a sectional type slotting mode, free surfaces are created for the second set of blast holes after the first set of blast holes are detonated, the slotting effect is improved, detonation clamping performance of the detonation bottoms is reduced, and the detonation effect of the detonation bottoms is greatly improved.

Description

technical field [0001] The invention relates to a tunnel excavation method, in particular to a segmented cutting method. Background technique [0002] In the process of tunnel excavation, the arrangement of blastholes is very critical, which determines the quality of the blasting effect of the tunnel excavation. The layout of traditional blastholes is basically divided into two categories, straight hole cutting and oblique hole cutting. Among them, the application of straight hole cutting is compared Extensive; the advantage of oblique hole cutting is that it can effectively throw the rocks within the range of the cutting out of the hole to form a compensation space. The number of blastholes required to form the compensation space is small and the utilization rate of the blastholes is high, but at the same time the accuracy of the blasthole angle is very high. The footage of a single blasting is limited; straight hole cutting is to cut the depth of all blastholes to the same...

Claims

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Application Information

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IPC IPC(8): F42D1/08
CPCF42D1/08
Inventor 严文炳张晨洁刘涛焦满岱柴衡山
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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