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Blasting construction method suitable for hydraulic pressure smooth surface of granitic geological III-grade surrounding rock

A technology of smooth blasting and construction method, applied in blasting, earth-moving drilling, mining equipment and other directions, can solve the problems of increased control difficulty of over and under excavation, unsatisfactory construction footage, and high dust concentration, achieving good shock absorption effect and saving The effect of ventilation time and improving construction efficiency

Active Publication Date: 2020-07-10
CHINA RAILWAY SEVENTH GRP CO LTD +1
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Problems solved by technology

The advantages of this blasting method are mature technology, convenient operation, and quick hands-on construction personnel, but the disadvantages are unsatisfactory construction footage, increased difficulty in over- and under-excavation control, large blasting vibration, high dust concentration after blasting, long ventilation time, and the amount of explosives used in blasting. bigger

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  • Blasting construction method suitable for hydraulic pressure smooth surface of granitic geological III-grade surrounding rock
  • Blasting construction method suitable for hydraulic pressure smooth surface of granitic geological III-grade surrounding rock
  • Blasting construction method suitable for hydraulic pressure smooth surface of granitic geological III-grade surrounding rock

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Embodiment Construction

[0034] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention. Detailed implementation methods and specific construction processes are given, but the scope of protection of the present invention is not limited to the following Mentioned examples.

[0035] Such as Figure 1-7 As shown, the construction method of the present invention suitable for granite geological grade III surrounding rock hydraulic pressure smooth blasting includes the following construction steps:

[0036] In the first step, various types of blastholes are excavated on the blasting surface according to the grade and footage of the surrounding rock. In this example, the area of ​​the blasting surface is 59.5m 2 , The height of the blasting section is 6.74m, and the bottom of the arch foot is 9.72m wide. Two rows of central cut holes 1 are excavated at th...

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Abstract

The invention discloses a blasting construction method suitable for a hydraulic pressure smooth surface of a granitic geological III-grade surrounding rock. The blasting construction method comprisesthe following steps: (1) excavating each shot hole including a center breaking-in hole, an inclined breaking-in hole, an auxiliary hole, a coping hole, a bottom plate hole and a peripheral hole; (2) blowing out residues in each blast hole through high-pressure air; (3) mounting an explosive roll clamped between water bags into each shot hole according to blasting design requirements, adopting a stemming material for sealing an opening end of the shot hole, and connecting the explosive roll to an electronic detonator initiation system; (4) checking safety of the electronic detonator initiationsystem, and detonating according to a sequence of blasting the inclined breaking-in hole, the center breaking-in hole, the auxiliary hole, the coping hole, the bottom plate hole and the peripheral hole; and (5) after no squib is checked, performing deslagging operation to accomplish construction. The blasting construction method uses hydraulic pressure blasting to improve drilling depth of the surrounding rock, saves usage amount of explosives, saves conventional blasting ventilation time, controls back break, improves construction efficiency, and greatly saves comprehensive cost by 8.9% in comparison with that in the prior art.

Description

Technical field [0001] The invention relates to the technical field of tunnel blasting construction, in particular to a hydraulic smooth blasting construction method suitable for Grade III surrounding rock of granite geology. Background technique [0002] At present, in domestic tunnel blasting construction, detonators are commonly used to blast with emulsion explosives, that is, put emulsion explosives in the blasthole, put the detonator on the second explosive near the bottom, and finally block the blasting mud to the blasthole orifice, pass the code The detonator is controlled by the detonator, and the detonator is used to detonate after the inspection is correct. The advantages of this blasting method are mature technology, convenient operation, and quick start-up by construction personnel. The disadvantages are that the construction footage is not ideal, the control of over and under excavation is more difficult, the blasting vibration is large, the dust concentration after ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D3/04F42D1/18E21D9/00
CPCF42D1/00F42D3/04F42D1/18E21D9/006
Inventor 朱传华李保军黄文蔚李纪龙刘同斌张亚磊宋成建王恒刘子扬刘学东毋京京周旭宁
Owner CHINA RAILWAY SEVENTH GRP CO LTD
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