Segmented one-time blasting well forming method for blind raise

Abstract

The invention discloses a blind courtyard segmented one-time blasting well completion method which comprises the following steps: S1, performing field investigation on a mine, and selecting and marking hole points; s2, proper equipment is selected to conduct upward construction drilling on the marked hole points; s3, after drilling is finished, the blast hole is filled with explosives upwards; and S4, finally, millisecond delay blasting is carried out at different points, and the interval is 50 ms. According to the segmented one-time blasting well completion method for the blind courtyard, upward medium-length hole segmented blasting one-time well completion is adopted, the problem that the blind courtyard in a goaf or under a filling body cannot be constructed can be solved, upper layered tunneling roadways are reduced, the roadway cutting length is reduced, workers do not need to enter the courtyard for operation, the situation of dangerous operation environments in traditional well completion construction is improved, and the construction efficiency is improved. And well completion safety conditions and operation efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of mine shaft construction, in particular to a blind shaft segmented one-time blasting method. Background Art

[0002] A mine shaft is a vertical or inclined tunnel in a mine used for ventilation, transportation, drainage, etc. The uses of mine shafts are diverse, including local ventilation mine shafts, cutting mine shafts, filling mine shafts, ballast mine shafts, etc. The uses of mine shafts are wide-ranging, not only for ore slitting, pedestrians, material transportation, ventilation, filling, and prospecting, etc.

[0003] With the continuous improvement of production efficiency, the common construction method requires manual entry into the mine shaft to work, the workers have high labor intensity, the working surface is narrow, and accidents are prone to occur, which is far from meeting the needs of mine shaft construction; and the use of reduced segmentation increases the excavation cost. Therefore, the present application provides a blind shaft segmented one-time blasting method to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a method for well construction by segmented one-time blasting of a blind shaft. The method adopts segmented blasting of medium-deep holes upward to form a well in one time, which can eliminate the problem that blind shafts under empty areas or filling bodies cannot be constructed, reduce the upper layer excavation tunnels, reduce the length of the cutting tunnels, and do not require manual entry into the shaft for operations. The dangerous working environment in traditional well construction is improved, the safety conditions and working efficiency of well construction are improved, and the problems in the background technology can be effectively solved.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for forming a blind shaft by blasting in sections at one time, comprising the following steps: S1. Conduct field survey of the mine, select and mark the hole points; S2. Select appropriate equipment to drill upward at the marked blasting point; S3, after the drilling is completed, explosives are loaded upward into the blasthole; S4. Finally, millisecond delayed blasting is performed at each point with an interval of 50ms.

[0006] As a preferred technical solution of the present invention, the hole points include hole point 1, hole point 2..., hole point 20, and hole point 21 from the inside to the outside, among which hole point 1 to hole point 5 are empty holes, and hole point 6 to hole point 21 are blasting points.

[0007] As a preferred technical solution of the present invention, with hole point 1 as the center point, a square structure is subsequently formed by four hole points with consecutive numbers, thereby obtaining square one formed by hole points 2 to 5, square two formed by hole points 6 to 9, square three formed by hole points 10 to 13, square four formed by hole points 14 to 17, and square five formed by hole points 18 to 21, wherein the four vertices of square one are distributed at the intersection of the inscribed circle of square two and its side line, wherein the four vertices of square three are distributed at the intersection of the inscribed circle of square four and its side line, wherein the four vertices of square four are distributed at the intersection of the inscribed circle of square five and its side line, and the side of square two is parallel to the corresponding side of square four.

[0008] As a preferred technical solution of the present invention, when millisecond delayed blasting is performed in S4, the two diagonal blasting points on square two are blasted first with a delay of 0ms, the remaining two blasting points are blasted with a delay of 50ms, the four blasting points on square three are blasted with a delay of 100ms, the four blasting points on square four are blasted with a delay of 150ms, and the four blasting points on square five are blasted with a delay of 200ms.

[0009] As a preferred technical solution of the present invention, the side length of square three is 1000mm, the side length of square five is 2000mm, and the distance from one of the vertices of rectangle three to the nearest side length of square two is 570mm.

[0010] As a preferred technical solution of the present invention, in S3, a charging device is used to load explosives upward into the hole, the depth of which is 4.0m, and the charging pipe is sealed with a filler with a sealing length of 1.0m; after sealing, the explosives are loaded again with a depth of 4.0m, and finally, gun mud is used for sealing with a sealing length of 1.0m, and the upper end of each explosive is filled with a detonating charge.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The blind shaft segmented one-time blasting well construction method exemplified in the present invention adopts the upward medium-deep hole segmented blasting one-time well construction, which can eliminate the problem that the blind shaft under the empty area or filling body cannot be constructed, reduce the upper layer excavation tunnel, reduce the length of the cutting tunnel, and do not need manual entry into the shaft for operation, thereby improving the dangerous working environment in traditional well construction and improving the safety conditions and working efficiency of well construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of hole point distribution of the present invention; Figure 2 This is a schematic diagram of the delayed blasting points of the present invention; Figure 3 It is a schematic diagram of the charge of the present invention. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] See also Figure 1-3 The present invention provides a technical solution: a blind shaft segmented one-time blasting method, comprising the following steps: S1. Conduct field survey of the mine, select and mark the hole points; S2. Select appropriate equipment to drill holes upward at the marked hole points, and use single hole straight line cutting when drilling; S3, after the drilling is completed, explosives are loaded upward into the blasthole; S4. Finally, millisecond delayed blasting is performed at each point with an interval of 50ms.

[0015] Furthermore, the hole points include hole point 1, hole point 2..., hole point 20, and hole point 21 from the inside to the outside, among which hole point 1 to hole point 5 are empty holes, hole point 6 to hole point 21 are blasting points, the hole depth of the empty hole is 10.5m, the hole depth of the blasting point is 10m, and the hole point depth is 70mm.

[0016] Furthermore, with hole point 1 as the center point, a square structure is subsequently formed by four hole points with consecutive numbers, thereby obtaining square one formed by hole points 2 to 5, square two formed by hole points 6 to 9, square three formed by hole points 10 to 13, square four formed by hole points 14 to 17, and square five formed by hole points 18 to 21, wherein the four vertices of square one are distributed at the intersections of the inscribed circle of square two and its side lines, wherein the four vertices of square three are distributed at the intersections of the inscribed circle of square four and its side lines, wherein the four vertices of square four are distributed at the intersections of the inscribed circle of square five and its side lines, and the sides of square two are parallel to the corresponding sides of square four.

[0017] Furthermore, when the millisecond delayed blasting is performed in S4, the two diagonal blasting points on square two are blasted first with a delay of 0ms, the remaining two blasting points are blasted with a delay of 50ms, the four blasting points on square three are blasted with a delay of 100ms, the four blasting points on square four are blasted with a delay of 150ms, and the four blasting points on square five are blasted with a delay of 200ms.

[0018] Furthermore, the side length of square three is 1000mm, the side length of square five is 2000mm, and the distance from one of the vertices of rectangle three to the nearest side length of square two is 570mm.

[0019] Further, such as Figure 3 As shown, in S3, explosives are loaded upward into the hole using charging equipment, the depth of which is 4.0 m, and the charging pipe is sealed with a filler, with a sealing length of 1.0 m; after sealing, the explosives are loaded again, the depth of which is 4.0 m, and finally, gun mud is used for sealing, with a sealing length of 1.0 m, and the upper end of each explosive is filled with a detonating charge.

[0020] The diameter of the explosive bag used is 56mm, the radius of the crushing zone can reach 0.2m, and the blasting hole interval is 50ms, which can effectively increase the secondary throwing effect, that is, reduce the required compensation space and reduce the rock block size after crushing; the crushing zone radius is 1m, which can meet the small compensation space for blasting speed requirements, and the blasting interval of 50ms increases the secondary crushing effect.

[0021] The blocking material is made of plastic bags for partition construction and does not require any solidification time.

[0022] Figure 3 In the figure, H represents the depth of explosives at the blasting point; h represents the length of the plugging material; and h1 represents the length of the taphole mud used for sealing.

[0023] The present invention adopts upward medium-deep hole segmented blasting to complete well construction in one time, which can eliminate the problem that blind wells under empty areas or filling bodies cannot be constructed, reduce the upper layer excavation tunnels, reduce the length of the cutting tunnels, and do not require manual entry into the well for operation. It improves the situation of dangerous working environment in traditional well construction and improves the safety conditions and working efficiency of well construction.

[0024] The undisclosed parts in the present invention are all prior art, and their specific structures, materials and working principles are not described in detail. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for building a blind shaft by blasting in sections at one time, characterized in that: The following steps are involved: S1. Conduct field survey of the mine, select and mark the hole points; S2. Select appropriate equipment to drill holes in the marked hole points in an upward direction; S3, after the drilling is completed, explosives are loaded upward into the blasthole; S4. Finally, millisecond delayed blasting is performed at each point with an interval of 50ms.

2. The blind shaft segmented one-time blasting method according to claim 1 is characterized in that: The hole points include hole point 1, hole point 2, ..., hole point 20, and hole point 21 from the inside to the outside, wherein hole point 1 to hole point 5 are empty holes, and hole point 6 to hole point 21 are blasting points.

3. The method for constructing a blind shaft by sectional one-time blasting according to claim 2 is characterized in that: With hole point 1 as the center point, a square structure is subsequently formed by four hole points with consecutive numbers, thereby obtaining square one formed by hole points 2 to 5, square two formed by hole points 6 to 9, square three formed by hole points 10 to 13, square four formed by hole points 14 to 17, and square five formed by hole points 18 to 21, wherein the four vertices of square one are distributed at the intersections of the incircle of square two and its sideline, wherein the four vertices of square three are distributed at the intersections of the incircle of square four and its sideline, wherein the four vertices of square four are distributed at the intersections of the incircle of square five and its sideline, and the side of square two is parallel to the corresponding side of square four.

4. The method for constructing a blind shaft by sectional one-time blasting according to claim 3 is characterized in that: When performing millisecond delayed blasting in S4, the two diagonal blasting points on square two blast first with a delay of 0ms, the remaining two blasting points blast with a delay of 50ms, the four blasting points on square three blast with a delay of 100ms, the four blasting points on square four blast with a delay of 150ms, and the four blasting points on square five blast with a delay of 200ms.

5. The method for constructing a blind shaft by sectional one-time blasting according to claim 3 is characterized in that: The side length of square three is 1000mm, the side length of square five is 2000mm, and the distance from one of the vertices of rectangle three to the nearest side of square two is 570mm.

6. The method for constructing a blind shaft by sectional one-time blasting according to claim 1 is characterized in that: In S3, charging equipment is used to load explosives upward into the hole, the depth of which is 4.0m, and the charging pipe is sealed with fillers with a length of 1.0m. After sealing, the explosives are loaded again with a depth of 4.0m, and finally, gun mud is used to seal the hole with a length of 1.0m. The upper end of each explosive is filled with a detonating charge.

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