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Pre-splitting blasting method for joint-cutting pipe

A pre-split blasting and slitting technology, applied in the field of slitting pipe pre-split blasting, can solve the problems of large consumption of explosives and other materials, increase engineering costs, affect work efficiency, etc., to save blasting equipment and speed up project progress. , the effect of improving work efficiency

Inactive Publication Date: 2014-07-02
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this blasting method has a large number of drill holes, consumes a lot of explosives and other materials, and is labor-intensive and time-consuming, which affects work efficiency and increases project costs.

Method used

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  • Pre-splitting blasting method for joint-cutting pipe
  • Pre-splitting blasting method for joint-cutting pipe
  • Pre-splitting blasting method for joint-cutting pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 slotted pipe pre-splitting blasting method (such as figure 1 , Figure 5 shown), including the following steps:

[0035] (1) Delineate the peripheral contour line of the blasting excavation area according to the design requirements of the differential blasting, and arrange the differential blasting holes in the main blasting excavation area.

[0036] (2) Arrange pre-splitting blast holes 1 along the contour line of the blasting excavation area.

[0037] Wherein: the diameter of the pre-split blast hole 1 is 38-42 mm, and the hole spacing of the pre-split blast hole 1 is 15-40 times of the diameter of the pre-split blast hole 1 .

[0038] (3) Place the slit pipe 2 in the pre-split blast hole 1, so that the two slits of the slit pipe 2 are in the plane formed by the axis of the pre-split blast hole 1, that is, in the plane of the pre-split 5 to be formed .

[0039] Wherein: the slit pipe 2 refers to a hollow pipe including a closed bottom end 7 and an ope...

Embodiment 2

[0046] Embodiment 2 slotted pipe pre-splitting blasting method (such as figure 1 , Figure 5 shown), including the following steps:

[0047] (1) Delineate the peripheral contour line of the blasting excavation area according to the design requirements of the differential blasting, and arrange the differential blasting holes in the main blasting excavation area.

[0048] (2) Arrange pre-splitting blast holes 1 along the contour line of the blasting excavation area.

[0049] Wherein the pre-splitting blast hole 1 is the same as that in embodiment 1.

[0050] (3) Place the slit pipe 2 in the pre-split blast hole 1, so that the two slits of the slit pipe 2 are in the plane formed by the axis of the pre-split blast hole 1, that is, in the plane of the pre-split 5 to be formed .

[0051] Wherein slit pipe 2 is with embodiment 1.

[0052] (4) According to the type of rock mass 4, the blasting charge 3 is carried out on the slit pipe 2 in the pre-splitting blast hole 1, and the l...

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Abstract

The invention relates to a pre-splitting blasting method for a joint-cutting pipe. The method comprises the following steps: (1) defining a peripheral profile line for a blasting excavation region, and arranging a micro-difference blasting hole in a main body blasting excavation region; (2) arranging a pre-splitting blasting hole along the peripheral profile line in the blasting excavation region; (3) placing the joint-cutting pipe in the pre-splitting blasting hole, and enabling two cut joints of the joint-cutting pipe to be in a plane formed by a shaft line of the pre-splitting blasting hole; (4) performing blasting charge on the joint-cutting pipe in the pre-splitting blasting hole, and arranging low section detonators; (5) performing blasting charge on the micro-difference blasting hole in the main body blasting excavation region, and arranging micro-difference blasting detonators at intervals at a position higher than the pre-splitting blasting hole by two sections; (6) blocking the micro-difference blasting hole and the pre-splitting blasting hole in the main body blasting excavation region; (7) connecting a priming network for blasting; (8) deslagging; and (9) repeating the steps (1) to (8) until completion of excavation. According to the pre-splitting blasting method provided by the invention, the pre-crack forming quality is improved and the engineering cost is decreased while the damage and cracking of a reserved rock body are reduced.

Description

technical field [0001] The invention relates to a pre-splitting blasting method in the field of controlled blasting, in particular to a slotted pipe pre-splitting blasting method. Background technique [0002] The pre-splitting blasting method is to drill dense blast holes parallel to each other on the excavation contour line, install explosives and detonators in the same section, and make them detonate before other blast holes. When appropriate, inter-connecting cracks, namely pre-cracks, will be formed between the blasting holes to separate the rock mass at the main excavation site from the rock mass that needs to be preserved. Afterwards, the rock mass at the main excavation site will be blasted. The online pre-cracks have been formed, so the blasting of the rock mass at the main excavation site will not cause damage to the retained rock mass, and the wall surface of the retained rock mass will be smoother and flatter. [0003] The through cracks formed by the pre-splitt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00
Inventor 言志信江平
Owner LANZHOU UNIVERSITY
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