Applicable to the construction method of hydraulic smooth blasting of granite geological grade Ⅲ 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-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: 2022-08-05
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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  • Applicable to the construction method of hydraulic smooth blasting of granite geological grade Ⅲ surrounding rock
  • Applicable to the construction method of hydraulic smooth blasting of granite geological grade Ⅲ surrounding rock
  • Applicable to the construction method of hydraulic smooth blasting of granite geological grade Ⅲ surrounding rock

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Embodiment Construction

[0034] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The present embodiment is implemented on the premise of the technical solution of the present invention, and provides detailed embodiments and specific construction processes, but the protection scope of the present invention is not limited to the following described embodiment.

[0035] like Figure 1-7 As shown, the hydraulic smooth blasting construction method for granite geological grade III surrounding rock according to the present invention includes the following construction steps:

[0036] The first step is to excavate various blastholes on the blasting surface according to the surrounding rock grade and footage. In this embodiment, the blasting surface area is 59.5m 2 , the height of the blasting section is 6.74m, and the bottom width at the arch foot is 9.72m. Two rows of central undercuts 1 are cut at the center of the blasting face, and ...

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Abstract

The invention discloses a construction method suitable for granite geological grade III surrounding rock water pressure smooth blasting. ②Blow out the residues in each blasthole by high-pressure air ③In accordance with the blasting design requirements, install the explosive coil sandwiched between the water bags in each blasthole. The safety of the electronic detonator detonation system shall be detonated in the order of blasting the slanted undercutting hole first, then the central undercutting hole, and finally blasting the auxiliary eye, the top hole, the bottom hole and the peripheral eye. , to complete the construction. The invention uses hydraulic blasting to improve the footage of surrounding rock, saves the amount of explosives, saves the ventilation time of conventional blasting, controls over and under excavation, improves construction efficiency, and saves about 8.9% of the overall cost compared with 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 granite geological grade III surrounding rock. Background technique [0002] At present, in domestic tunnel blasting construction, detonators are commonly used with emulsion explosives for blasting, that is, the emulsion explosives are placed in the blasthole, and the detonator is placed on the second section of explosives near the bottom, and finally the mud is blocked to the blasthole orifice. The detonator is controlled by the detonator, and the detonator is used to detonate after checking that it is correct. The advantages of this blasting method are that the technology is mature, the operation is convenient, and the construction personnel are quick to use. larger. SUMMARY OF THE INVENTION [0003] In order to solve the above problems, the present invention provides a construction method for...

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Application Information

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Patent Type & Authority Patents(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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