A Smooth Fine Blasting Method Based on Precharge

Abstract

The invention discloses a smooth fine blasting technology based on pre-charging, and belongs to the technical field of smooth blasting. The technology is characterized in that according to tunnel smooth blasting design needs, a specific pre-charging site is designed; secondly, on the basis of the blasting control needs, a pre-charging device is adopted, and pre-charging of explosive materials on aperipheral hole can be carried out; thirdly, after a tunnel face is subjected to cutting hole and auxiliary hole charging, an explosive material tube pre-assembled in the peripheral hole is put intothe peripheral hole, and fine control over charging of the peripheral hole is achieved; and fourthly, a cutting hole, an auxiliary hole and the peripheral hole are sequentially detonated, and tunnel fine smooth blasting is achieved. The pre-charging technology is adopted, the asymmetric non-coupling charging structure of the peripheral hole can be accurately controlled, charging operation is morestandard, the technical problem that in the prior art, during site charging, the charging process cannot be precisely controlled can be solved, the regularity of the outline formed after blasting of the peripheral hole can be improved, meanwhile, charging operation is standard, the charging efficiency is improved, and the charging danger is reduced.

Description

technical field [0001] The invention relates to the technical field of smooth blasting, in particular to a smooth fine blasting method based on precharged charges. Background technique [0002] Smooth surface blasting is a widely used method of controlled blasting. Its main advantage is that the purpose of controlled blasting can be achieved by setting peripheral light blasting holes near the tunnel design outline. [0003] But in the actual site smooth blasting construction charge process, there are big problems. In the smooth blasting construction of the tunnel site, the uncoupled charge structure is usually adopted. Because there is a gap between the charge roll and the blast hole in the uncoupled charge structure, the charge roll is generally in contact with the lower side wall of the blast hole under the action of gravity, forming a Eccentricity does not couple the charge structure. This eccentric charge structure causes the energy released by the explosive explosion ...

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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a smooth surface fine blasting method based on pre-charged powder to solve the problems of irregular operation, low charging efficiency and inability to charge powder on site in existing smooth surface blasting of tunnels. Precise control of the charge structure and other shortcomings, the technical problem that it is difficult to achieve the designed smooth blasting effect

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