CN115615269A - Smooth blasting construction method for low-blasting-speed explosives - Google Patents

Abstract

The invention discloses a smooth blasting construction method for low-detonation-velocity explosives, and relates to the technical field of smooth blasting. The smooth blasting construction method of the low-blasting-speed explosive comprises the following specific operations: s1, connecting a pneumatic charge machine to an underground mine air pipe, and cleaning accumulated water and accumulated slag in a hole by using the pneumatic charge machine; s2, manufacturing a blasting charge by using an electronic detonator and a common 32mm diameter cartridge, and filling the blasting charge into the peripheral hole by using a gun stick. The low-detonation-velocity explosive smooth blasting construction method adopts a specially-made low-detonation-velocity ammonium nitrate fuel oil explosive coupled loading structure to replace a traditional 32 mm-diameter No. 2 rock emulsion explosive spaced loading structure for loading, adopts a pneumatic explosive loader simultaneously, and carries out smooth blasting construction operation by loading emulsion ammonium nitrate fuel oil explosive through an anti-static explosive conveying pipe, so that the tunneling blasting smooth blasting effect can be effectively improved, especially the tunnel smooth blasting forming effect of a rock bedding development area, and is adaptive to mechanized construction, easy to construct, long in construction time of peripheral hole smooth blasting, and the construction strength is reduced.

Description

Smooth blasting construction method for low-blasting-speed explosives

Technical Field

The invention relates to the technical field of smooth blasting, in particular to a smooth blasting construction method of low-detonation-velocity explosives.

Background

In the smooth blasting, blast holes with small intervals are arranged along an excavation boundary, non-coupled explosive charging or low-power explosive is adopted, radial air intervals are reserved between explosive packages and the hole wall, and smooth groups are detonated after a main blasting area, so that a flat profile surface is formed. Aiming at different lithologies, the contour of the tunnel excavated after blasting basically meets the design requirements by means of reasonable blasthole arrangement, charge control, charge structure and the like, the surface is smooth, the forming is regular, the damage to the top plate is reduced, the rock slope cracks of smooth blasting are few, the stability is high, and the method is not only beneficial to reducing the engineering supporting cost, but also beneficial to the long-term safety of the tunnel. The traditional tunneling smooth blasting mainly adopts a standard explosive diameter (32 mm) and detonating cord segmented interval explosive loading structure, the explosive loading method is simple, the explosive loading manufacturing process is complex, the efficiency is low, the smooth blasting forming effect is general, and meanwhile, the mechanical construction cannot be effectively realized.

Use the face blasting technique of traditional light, then must prepare thin bamboo pole in advance, tie up the explosive cartridge of emulsion explosive with the explosive fuse, construction steps is comparatively loaded down with trivial details, material consumption is great, and there is the difference in interval charge structure air section and charge section to the cliff blasting effect, there is the problem of partial super undermining after the tunnel shaping, lead to the wall unevenness, in wall hole smooth surface blasting process, because traditional eccentricity is more unsatisfactory apart from interval charge structure big gun hole light explosion becomes the seam effect, the rock stratum development region, high detonation velocity high energy density explosive can lead to the cliff excessively to destroy, half porosity is low, tunnel shaping effect is poor.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a low-detonation-velocity explosive smooth blasting construction method, which solves the problems that a thin bamboo rod needs to be prepared in advance, an explosive fuse is bound to an emulsion explosive cartridge, the construction steps are complicated, the material consumption is large, the blasting effect of an air section and an explosive section of an interval explosive filling structure on a rock wall is different, part of the problem of overbreak exists after a tunnel is formed, the wall surface is uneven, and in the wall hole smooth blasting process, the hole smooth blasting seam forming effect of the traditional eccentric distance interval explosive filling structure is not ideal, rock stratum development areas and high-detonation-velocity high-energy density explosives can cause excessive damage to the rock wall, the half porosity is low, and the tunnel forming effect is poor due to the traditional eccentric distance interval explosive filling structure.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a smooth blasting construction method of low-blasting-speed explosives specifically comprises the following operations:

s1, connecting a pneumatic charge machine to an underground mine air pipe, and cleaning accumulated water and accumulated slag in a hole by using the pneumatic charge machine;

s2, manufacturing a primary explosive charge by using an electronic detonator and a common 32 mm-diameter cartridge, and filling the primary explosive charge into the peripheral hole by using a gun stick;

s3, connecting the charge device with an underground mine air pipe, charging the low-detonation velocity ammonium nitrate fuel oil explosive into a charge tank of the pneumatic charge device, and connecting a charge delivery pipe to the charge tank;

s4, extending the medicine conveying tank into the bottom of the peripheral hole, loading low-detonation-velocity ammonium nitrate fuel oil explosive by adopting a medicine loader, uniformly drawing a pipe to the designed charging length, reserving a certain air section, and then blocking the hole;

and S5, after the single-hole charging is finished, charging the next peripheral hole, and circulating until the construction is finished.

(III) advantageous effects

The invention provides a smooth blasting construction method of low-blasting-speed explosives. The method has the following beneficial effects:

the low-detonation-velocity explosive smooth blasting construction method adopts a specially-made low-detonation-velocity ammonium nitrate fuel oil explosive coupling loading structure to replace a traditional 32 mm-diameter No. 2 rock emulsion explosive spaced loading structure for loading, and simultaneously adopts a pneumatic explosive loader to load emulsion ammonium nitrate fuel oil explosives through an anti-static explosive conveying pipe to carry out smooth blasting construction operation, so that the tunneling blasting smooth blasting effect can be effectively improved, particularly the tunnel smooth blasting forming effect in a rock bedding development area, the adaptation mechanical construction is realized, the construction is easy, the construction time of peripheral hole smooth blasting construction can be effectively reduced, the construction strength is reduced, the preparation work such as binding explosive rolls and detonating cords is omitted, the loading can be completed only by blowing the pneumatic explosive loader, the construction efficiency is improved, meanwhile, the energy distribution of the coupling loading structure is more uniform, the excess excavation after tunnel forming can be effectively controlled, the half-hole ratio after blasting can be ensured, particularly the low-energy wall hole smooth blasting effect can be ensured, and meanwhile, the blasting damage to a rock wall can be reduced by adopting the low-velocity explosive coupling loading structure, so that a better smooth blasting forming effect can be achieved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

In the figure: 1, a detonator; 2. initiating explosive charges; 3. ammonium nitrate fuel oil explosive with low detonation velocity; 4. an air section; 5. a plugging section; 6. the walls of the rock pores.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a low-detonation-velocity explosive smooth blasting construction method specifically comprises the following operations:

s1, connecting a pneumatic charge machine to an underground mine air pipe, and cleaning accumulated water and accumulated slag in a hole by using the pneumatic charge machine;

s2, manufacturing a blasting charge by using an electronic detonator and a common 32mm diameter cartridge, and filling the blasting charge into the peripheral hole by using a gun stick;

s3, connecting the explosive loading device with an underground mine air pipe, loading the ammonium nitrate fuel oil explosive with low explosion velocity into an explosive loading tank of the pneumatic explosive loading device, and connecting a explosive conveying pipe to the explosive loading tank;

s4, extending the medicine conveying tank into the bottom of the peripheral hole, loading low-detonation-velocity ammonium nitrate fuel oil explosive by adopting a medicine loader, uniformly drawing a pipe to the designed charging length, reserving a certain air section, and then blocking the hole;

and S5, after the single-hole charging is finished, charging the next peripheral hole, and circulating until the construction is finished.

In conclusion, the low-detonation-velocity-explosive smooth blasting construction method adopts a specially-made low-detonation-velocity anfo explosive coupling charging structure to replace a traditional 32 mm-diameter No. 2 rock emulsion explosive spaced charging structure for charging, adopts a pneumatic explosive loader, and carries out smooth blasting construction operation by loading emulsion anfo explosive through an anti-static explosive conveying pipe, so that the tunneling blasting smooth blasting effect can be effectively improved, particularly the tunnel smooth blasting forming effect in a rock bedding development area.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (1)

1. A smooth blasting construction method of low-blasting-speed explosives is characterized by comprising the following steps: the specific operation is as follows:

s1, connecting a pneumatic charging device to an underground mine air pipe, and cleaning accumulated water and accumulated slag in a hole by using the pneumatic charging device;

s2, manufacturing a blasting charge by using an electronic detonator and a common 32mm diameter cartridge, and filling the blasting charge into the peripheral hole by using a gun stick;

s3, connecting the charge device with an underground mine air pipe, charging the low-detonation velocity ammonium nitrate fuel oil explosive into a charge tank of the pneumatic charge device, and connecting a charge delivery pipe to the charge tank;

s4, extending the medicine conveying tank into the bottom of the peripheral hole, loading low-detonation-velocity ammonium nitrate fuel oil explosive by adopting a medicine loader, uniformly drawing a pipe to the designed charging length, reserving a certain air section, and then blocking the hole;

and S5, after the single-hole charging is finished, charging the next peripheral hole, and circulating until the construction is finished.

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