LU500151B1 - Closed Free Face Cut Blasting Method Capable of Improving Blasting Efficiency - Google Patents
Closed Free Face Cut Blasting Method Capable of Improving Blasting Efficiency Download PDFInfo
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- LU500151B1 LU500151B1 LU500151A LU500151A LU500151B1 LU 500151 B1 LU500151 B1 LU 500151B1 LU 500151 A LU500151 A LU 500151A LU 500151 A LU500151 A LU 500151A LU 500151 B1 LU500151 B1 LU 500151B1
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- easer
- cut
- cutting
- blasting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The present invention belongs to the technical field of mining engineering. Disclosed by the present invention is a closed free face cut blasting method capable of improving blasting efficiency, comprising the following steps: arranging cut holes, cutting holes, first easer holes, second easer holes, third easer holes and periphery holes sequentially on a working face, and providing cartridges with a controlled crack propagation direction; charging explosives into the cartridges, then loading the cartridges filled with explosives into the cutting holes, and adjusting the cutting direction of the cartridges by using tamping rods to enable the cutting direction of the cutting holes to form an annular closed free face; charging ordinary cartridged explosives into all holes sequentially, and plugging the holes sequentially with stemming; and finally, carrying out millisecond blasting.
Description
DESCRIPTION 1500151 Closed Free Face Cut Blasting Method Capable of Improving Blasting Efficiency
TECHNICAL FIELD The present invention relates to a blasting method, in particular to a closed free face cut blasting method capable of improving blasting efficiency, and belongs to the technical field of mining engineering.
BACKGROUND In the mining of underground mineral resources such as coal, when the hardness coefficient f of rock roadways is greater than 7, blasting excavation is mainly used for mining. In blasting excavation of roadways, the cut effect directly determines the cyclical footage. However, due to complex working environment of underground roadways, only a single free face is available, and the clamping force is large, so the effect of ordinary cut is not satisfactory.
SUMMARY In order to solve the shortcomings in the prior art, the main purpose of the present invention is to provide a closed free face cut blasting method capable of improving blasting efficiency.
The purpose of the present invention can be achieved by adopting the following technical solution: A closed free face cut blasting method capable of improving blasting efficiency, comprising the following steps: step 1: arranging cut holes, cutting holes, first easer holes, second easer holes, third easer holes and periphery holes sequentially on a working face, and providing cartridges with a controlled crack propagation direction;
step 2: charging explosives into the cartridges, then loading the cartridges LUS00151 filled with explosives into the cutting holes, and adjusting the cutting direction of the cartridges by using tamping rods to enable the cutting direction of the cutting holes to form an annular closed free face; step 3: charging ordinary cartridged explosives into the cut holes, the first easer holes, the second easer holes, the third easer holes and the periphery holes sequentially; step 4: plugging the cut holes, the cutting holes, the first easer holes, the second easer holes, the third easer holes and the periphery holes sequentially with stemming; and step 5: carrying out millisecond blasting.
Preferably, the cut holes, the cutting holes, the first easer holes, the second easer holes, the third easer holes and the periphery holes are respectively arranged in a ring.
Preferably, the cut holes, the cutting holes, the first easer holes, the second easer holes, the third easer holes and the periphery holes are sequentially arranged from the inside out; and the row spacing between the cutting holes and the cut holes is less than the row spacing between the first easer holes and the second easer holes, and less than the row spacing between the second easer holes and the third easer holes.
Preferably, the cartridges with a controlled crack propagation direction are cavity-type energy relief seam cartridges.
Preferably, an explosive chamber and a cavity are arranged in each of the cavity-type energy relief seam cartridges, and an energy relief seam is formed in the cavity.
Preferably, the energy relief seam is provided with energy relief seam LUS00151 angles on both sides, and the energy relief seam angles range from 45° to 75°.
Preferably, the explosive chamber is filled with explosives, and the cavity is filled with a rubber pad wave-blocking material.
Preferably, when the lithology is poor, empty holes are also arranged between any two cutting holes loaded with cartridges.
Preferably, the millisecond blasting sequence is that the cutting holes are detonated, and then the cut holes, the first circle of easer holes, the second circle of easer holes, the third circle of easer holes and the periphery holes are sequentially detonated.
The present invention has the following advantageous effects:
1. The annular free face formed by the cutting holes surrounds the cut holes, creating an extra free face for the cut holes. During blasting of the cut holes, the resulting compressive stress wave will be reflected to form a tensile stress wave after propagating to the closed free face, due to poor tensile strength of rocks, the tensile stress wave will intensify the breakage of rocks, so that the cut effect is improved.
2. The cutting holes are detonated before the cut holes, and a closed annular free face is formed around the cut holes to prevent stress wave resulting from the blasting of the cut holes from propagating to reserved rock masses and reduce damage of blasting vibration of the cut holes to protected rock masses.
3. The annular free face can improve the cut efficiency, thereby reducing the total explosive consumption, reducing the damage and costs caused by explosive explosion to surrounding rock masses and adjacent structures, and improving the construction safety. LUS00151
4. The energy relief seam angles range from 45° to 75°, so as to facilitate concentrated release of explosion products in the direction of the energy relief seam, forming jets and forming directional cracks in the direction of the energy relief seam.
BRIEF DESCRIPTION OF THE FIGURES FIG. 1 shows the layout of sink shaft holes based on closed free face cut according to a preferred embodiment of the closed free face cut blasting method capable of improving blasting efficiency of the present invention.
FIG. 2 is a sectional view of sink shaft holes based on closed free face cut according to a preferred embodiment of the closed free face cut blasting method capable of improving blasting efficiency of the present invention.
FIG. 3 shows the layout of drift holes based on closed free face cut according to a preferred embodiment of the closed free face cut blasting method capable of improving blasting efficiency of the present invention.
FIG. 4 is a sectional view of drift holes based on closed free face cut according to a preferred embodiment of the closed free face cut blasting method capable of improving blasting efficiency of the present invention.
FIG. 5 shows the layout of sink shaft holes with empty holes based on closed free face cut according to a preferred embodiment of the closed free face cut blasting method capable of improving blasting efficiency of the present invention.
FIG. 6 is a sectional view of sink shaft holes with empty holes based on closed free face cut according to a preferred embodiment of the closed free face cut blasting method capable of improving blasting efficiency of the present invention. 17500151 FIG. 7 is a schematic diagram of a cartridge with a controlled crack propagation direction according to a preferred embodiment of the closed free face cut blasting method capable of improving blasting efficiency of the present invention.
In the figures: 1-cut holes, 2-cutting holes, 3-first easer holes, 4-second easer holes, 5-third easer holes, 6-periphery holes, 7-closed free face, 8-empty holes, 9-explosive chamber, 10-cavity, 11-energy relief seam, 12-energy relief seam angle.
DESCRIPTION OF THE INVENTION In order to make the technical solution of the present invention clearer to those skilled in the art, the present invention will be further described in detail with reference to examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.
As shown in FIGS. 1-4, the closed free face cut blasting method capable of improving blasting efficiency provided by the example is characterized by comprising the following steps: step 1: arranging cut holes (1), cutting holes (2), first easer holes (3), second easer holes (4), third easer holes (5) and periphery holes (6) sequentially on a working face, and providing cartridges with a controlled crack propagation direction; step 2: charging explosives into the cartridges, then loading the cartridges filed with explosives into the cutting holes (2), and adjusting the cutting direction of the cartridges by using tamping rods to enable the cutting direction of the cutting holes (2) to form an annular closed free face (7);
step 3: charging ordinary cartridged explosives into the cut holes (1), the LUS00151 first easer holes (3), the second easer holes (4), the third easer holes (5) and the periphery holes (6) sequentially; step 4: plugging the cut holes (1), the cutting holes (2), the first easer holes (3), the second easer holes (4), the third easer holes (5) and the periphery holes (6) sequentially with stemming; and step 5: carrying out millisecond blasting.
The cut holes (1), the cutting holes (2), the first easer holes (3), the second easer holes (4), the third easer holes (5) and the periphery holes (6) are respectively arranged in a ring; the cut holes (1), the cutting holes (2), the first easer holes (3), the second easer holes (4), the third easer holes (5) and the periphery holes (6) are sequentially arranged from the inside out; and the row spacing between the cutting holes (2) and the cut holes (1) is less than the row spacing between the first easer holes (3) and the second easer holes (4), and less than the row spacing between the second easer holes (4) and the third easer holes (5).
The cartridges with a controlled crack propagation direction are cavity-type energy relief seam cartridges; an explosive chamber (9) and a cavity (10) are arranged in each of the cavity-type energy relief seam cartridges, and an energy relief seam (11) is formed in the cavity (10); the energy relief seam (11) is provided with energy relief seam angles (12) on both sides, and the energy relief seam angles (12) range from 45° to 75° to facilitate concentrated release of explosion products in the direction of the energy relief seam (11), forming jets and forming directional cracks in the direction of the energy relief seam (11); the explosive chamber (9) is filled with explosives, and the cavity (10) is filled with a rubber pad wave-blocking material. The 4500151 wave-blocking material can absorb energy released after explosion, so as to minimize cracks in the non-energy-relief direction.
When the lithology is poor, empty holes (8) can also be arranged between any two cutting holes (2) loaded with cartridges. The empty holes are designed to guide directional cracks produced by the cutting holes to run through each other, facilitating the formation of an annular free face (7).
The millisecond blasting sequence is that the cutting holes (2) are detonated, and then the cut holes (1), the first circle of easer holes (3), the second circle of easer holes (4), the third circle of easer holes (5) and the periphery holes (6) are sequentially detonated.
Example 1 FIG. 1 and FIG. 2 show the layout of sink shaft holes based on closed free face cut, and FIG. 3 and FIG. 4 show the layout of drift holes based on closed free face cut, including cut holes (1), cutting holes (2), first circle of easer holes (3), second circle of easer holes (4), third circle of easer holes (5), periphery holes (6) and a closed free face (7).
Example 2 Referring to FIGS 5 and 6, for use in the case of hard or poor lithology, empty holes (8) are arranged between two cutting holes (2) on the basis of Example 1.
Example 3 FIG. 7 is a schematic diagram of a cartridge with a controlled crack propagation direction, comprising an explosive chamber (9) filled with explosives, a cavity (10) filled with a wave-blocking material such as rubber pads and soft cloth, and an energy relief seam (11) with an energy relief seam LUS00151 angle (12) of 60°.
Example 4 A sink shaft blasting based on closed free face cut based on Example 1 is described below, comprising the following steps: step 1: cleaning up the remaining slag at the bottom of a shaft, levelling off uneven areas with a pneumatic pick, and draining water accumulated at the bottom of the shaft with an air pump; step 2: marking the positions of cut holes (1) on a sink shaft working face, as shown in FIG. 1; As a preferred solution, the 8 cut holes (1) have a circle diameter of 91.6 m and a hole spacing of 628 mm, and the cut holes are formed by a wedge cut method, with an oblique insertion angle of 80° and a hole depth of 4.3 m.
step 3: marking the positions of cutting holes (2) on the sink shaft working face, where the cutting holes (2) are located on the outer ring of the cut holes (1), and the row spacing between the cutting holes (2) and the cut holes (1) is less than the row spacing between two circles of easer holes, as shown in FIG. 1; as a preferred solution, the cutting holes (1) have a circle diameter of 2.1 m, a hole spacing of 796 mm, a hole angle of 90° and a hole depth of 4.3 m; step 4: marking the positions of the first circle of easer holes (3) on the sink shaft working face, as shown in FIG. 1; as a preferred solution, the first circle of easer holes (3) has a circle diameter of ¢3.2 m, a hole spacing of 894 mm, a hole angle of 90° and a hole depth of 4.3 m;
step 5: marking the positions of the second circle of easer holes (4) on the LUS00151 sink shaft working face, as shown in FIG. 1; as a preferred solution, the second circle of easer holes (4) has a circle diameter of 4.4 m, a hole spacing of 854 mm, a hole angle of 90° and a hole depth of 4.3 m; step 6: marking the positions of the third circle of easer holes (5) on the sink shaft working face, as shown in FIG. 1; as a preferred solution, the third circle of easer holes (5) has a circle diameter of 95.4 m, a hole spacing of 842 mm, a hole angle of 90° and a hole depth of 4.3 m; step 7: marking the positions of periphery holes (6) on the sink shaft working face, as shown in FIG. 1; as a preferred solution, the periphery holes (6) have a circle diameter of
6.7 m, a hole spacing of 583 mm, a hole angle of 90° and a hole depth of 4.3 m, step 8: making cartridges with a controlled crack propagation direction, filling an energy-absorbing material such as rubber pads and soft cloth into cavities (10), and charging finished cartridged explosives into explosive chambers (9); step 10: making common primers and cartridge primers; fabrication of common primers: inserting two detonators into the finished cartridged explosives, and winding the cartridged explosives with leading wires to fix the detonators and the explosives, electric detonators if used must be short circuited to prevent stray current from entering and causing premature explosion; and fabrication of cartridge primers: charging the ready-made common primers into the explosive chamber (10); LUS00151 step 11: loading the cartridges filled with explosives into the cutting holes (2), and then adjusting the direction of the energy relief seam (11), so that cracks propagate along the direction of the energy relief seam (11) and finally form a closed free face (7) after blasting of the cutting holes (2), as shown in FIG. 1; step 12: loading common finished cartridged explosives into the cut holes (1), the first circle of easer holes (3), the second circle of easer holes (4), the third circle of easer holes (5) and the periphery holes (6) for bottom priming, with primers at the lower parts of the holes; step 13: plugging the holes with water stemming; step 14: connecting a detonating network; step 15: carrying out millisecond blasting, in which the cutting holes (2) are detonated, and then the cut holes (1), the first circle of easer holes (3), the second circle of easer holes (4), the third circle of easer holes (5) and the periphery holes (6) are sequentially detonated; and step 16: deslagging.
Example 5 A roadway blasting based on closed free face cut based on Example 1 is described below, comprising the following steps: step 1: marking the positions of cut holes (1) on a drift working face, as shown in FIG. 3; as a preferred solution, the cut holes are formed by a wedge cut method, with an oblique insertion angle of 83°, a hole depth of 2.2 m and a hole diameter of 42 mm;
step 2: marking the positions of cutting holes (2) on the roadway working LUS00151 face, where the cutting holes (2) are located on the outer ring of the cut holes (1), and the row spacing between the cutting holes (2) and the cut holes (1) is less than the row spacing between two circles of easer holes, as shown in FIG. 3;
as a preferred solution, the row spacing between the cutting holes (2) and the cut holes (1) is 200 mm, and the cutting holes have a hole spacing of 635 mm, with a blast hole angle of 90° and a blast hole depth of 2.0 m;
step 3: marking the positions of the first circle of easer holes (3), the second circle of easer holes (4) and the third circle of easer holes (5) sequentially on the periphery of the cutting holes, as shown in FIG. 3;
as a preferred solution, the first circle of easer holes (3) has a hole spacing of 635 mm, the second circle of easer holes (4) has a hole spacing of 450 mm, and the third circle of easer holes (5) has a hole spacing of 600 mm, with a hole angle of 90° and a hole depth of 2.0 m;
step 4: marking the positions of periphery holes (6) on the roadway working face, as shown in FIG. 3;
as a preferred solution, the periphery holes (6) have a hole spacing of 600 mm and a hole depth of 2.0 m, and the holes are obliquely inserted outward by 10°;
step 5: making cartridges with a controlled crack propagation direction, filling an energy-absorbing material such as rubber pads and soft cloth into cavities (10), and charging finished cartridged explosives into explosive chambers (9);
step 6: making common primers and cartridge primers; fabrication of common primers: inserting two detonators into the finished cartridged LUS00151 explosives, and winding the cartridged explosives with leading wires to fix the detonators and the explosives, electric detonators if used must be short circuited to prevent stray current from entering and causing premature explosion; and fabrication of cartridge primers: charging the ready-made common primers into the explosive chamber (10); step 7: loading the cartridges filled with explosives into the cutting holes (2), and then adjusting the direction of the energy relief seam (11), so that cracks propagate along the direction of the energy relief seam (11) and finally form a closed free face (7) after blasting of the cutting holes (2), as shown in FIG. 3; step 8: loading common finished cartridged explosives into the cut holes (1), the easer holes (3, 4, 5) and the periphery holes (6) for collar priming, with primers at the upper middle parts of the holes; step 9: plugging the holes with water stemming; step 10: connecting a detonating network; step 11: carrying out millisecond blasting, in which the cutting holes (2) are detonated, and then the cut holes (1), the first circle of easer holes (3), the second circle of easer holes (4), the third circle of easer holes (5) and the periphery holes (6) are sequentially detonated; and step 12: deslagging.
Example 6 A sink shaft blasting based on closed free face cut based on Example 2 is described below, comprising the following steps: step 1: cleaning up the remaining slag at the bottom of a shaft, levelling off uneven areas with a pneumatic pick, and draining water accumulated at the LUS00151 bottom of the shaft with an air pump;
step 2: marking the positions of cut holes (1) on a sink shaft working face, as shown in FIG. 5;
as a preferred solution, the 8 cut holes (1) have a circle diameter of ¢1.6 m and a hole spacing of 628 mm, and the cut holes are formed by a wedge cut method, with an oblique insertion angle of 80° and a hole depth of 4.3 m;
step 3: marking the positions of cutting holes (2) and empty holes (8) on the sink shaft working face, where the cutting holes (2) are located on the outer ring of the cut holes (1), the row spacing between the cutting holes (1) and the cut holes (2) is less than the row spacing between two circles of easer holes, and the empty holes (8) are uniformly distributed between the cutting holes, as shown in FIG. 5;
as a preferred solution, the cutting holes (2) have a circle diameter of ¢2.1 m, and the spacing between the cutting holes (2) and the empty holes (8) is 398 mm, with a hole angle of 90° and a hole depth of 4.3 m;
step 4: marking the positions of the first circle of easer holes (3) on the sink shaft working face, as shown in FIG. 5;
as a preferred solution, the first circle of easer holes (3) has a circle diameter of ¢3.2 m, a hole spacing of 894 mm, a hole angle of 90° and a hole depth of 4.3 m;
step 5: marking the positions of the second circle of easer holes (4) on the sink shaft working face, as shown in FIG. 5;
as a preferred solution, the second circle of easer holes (4) has a circle diameter of 4.4 m, a hole spacing of 854 mm, a hole angle of 90° and a hole depth of 4.3 m: LUS00151 step 6: marking the positions of the third circle of easer holes (5) on the sink shaft working face, as shown in FIG. 5; as a preferred solution, the third circle of easer holes (5) has a circle diameter of 95.4 m, a hole spacing of 842 mm, a hole angle of 90° and a hole depth of 4.3 m; step 7: marking the positions of periphery holes (6) on the sink shaft working face, as shown in FIG. 5; as a preferred solution, the periphery holes (6) have a circle diameter of
6.7 m, a hole spacing of 583 mm, a hole angle of 90° and a hole depth of 4.3 m, step 8: making cartridges with a controlled crack propagation direction, filling an energy-absorbing material such as rubber pads and soft cloth into cavities (10), and charging finished cartridged explosives into explosive chambers (9); step 10: making common primers and cartridge primers; fabrication of common primers: inserting two detonators into the finished cartridged explosives, and winding the cartridged explosives with leading wires to fix the detonators and the explosives, electric detonators if used must be short circuited to prevent stray current from entering and causing premature explosion; and fabrication of cartridge primers: charging the ready-made common primers into the explosive chamber (10); step 11: loading the cartridges filled with explosives into the cutting holes (2), and then adjusting the direction of the energy relief seam (11), so that cracks propagate along the direction of the energy relief seam (11) and finally form a closed free face (7) after blasting of the cutting holes (2), as shown in LUS00151 FIG. 5; step 12: loading common finished cartridged explosives into the cut holes (1), the first circle of easer holes (3), the second circle of easer holes (4), the third circle of easer holes (5) and the periphery holes (6) for bottom priming, with primers at the lower parts of the holes; step 13: plugging the holes with water stemming; step 14: connecting a detonating network; step 15: carrying out millisecond blasting, in which the cutting holes (2) are detonated, and then the cut holes (1), the first circle of easer holes (3), the second circle of easer holes (4), the third circle of easer holes (5) and the periphery holes (6) are sequentially detonated; and step 16: deslagging.
In conclusion, according to the closed free face cut blasting method capable of improving blasting efficiency in the example, the cutting holes (2) are detonated before the cut holes (1), and a closed annular free face (7) is formed around the cut holes (1) to prevent stress wave resulting from the blasting of the cut holes (1) from propagating to reserved rock masses and reduce damage of blasting vibration of the cut holes (1) to protected rock masses. The annular free face (7) formed by the cutting holes (2) surrounds the cut holes (1), creating an extra free face for the cut holes (1). During blasting of the cut holes(1), the resulting compressive stress wave will be reflected to form a tensile stress wave after propagating to the closed free face (7), due to poor tensile strength of rocks, the tensile stress wave will intensify the breakage of rocks, so that the cut effect is improved. The annular free face
(7) can improve the cut efficiency, thereby reducing the total explosive LUS00151 consumption, reducing the damage and costs caused by explosive explosion to surrounding rock masses and adjacent structures, and improving the blasting efficiency and construction safety.
The foregoing description is merely further embodiments of the present invention, but is not intended to limit the protection scope of the present invention. Various equivalent substitutions or modifications made by those skilled in the art within the scope disclosed by the present invention according to the technical solution and inventive concept of the present invention should be included within the protection scope of the present invention.
Claims (9)
1.A closed free face cut blasting method capable of improving blasting efficiency, characterized by comprising the following steps: step 1: arranging cut holes (1), cutting holes (2), first easer holes (3), second easer holes (4), third easer holes (5) and periphery holes (6) sequentially on a working face, and providing cartridges with a controlled crack propagation direction: step 2: charging explosives into the cartridges, then loading the cartridges filed with explosives into the cutting holes (2), and adjusting the cutting direction of the cartridges by using tamping rods to enable the cutting direction of the cutting holes (2) to form an annular closed free face (7); step 3: charging ordinary cartridged explosives into the cut holes (1), the first easer holes (3), the second easer holes (4), the third easer holes (5) and the periphery holes (6) sequentially; step 4: plugging the cut holes (1), the cutting holes (2), the first easer holes (3), the second easer holes (4), the third easer holes (5) and the periphery holes (6) sequentially with stemming; and step 5: carrying out millisecond blasting.
2. The closed free face cut blasting method capable of improving blasting efficiency according to claim 1, characterized in that the cut holes (1), the cutting holes (2), the first easer holes (3), the second easer holes (4), the third easer holes (5) and the periphery holes (6) are respectively arranged in a ring.
3. The closed free face cut blasting method capable of improving blasting efficiency according to claim 2, characterized in that the cut holes (1), the cutting holes (2), the first easer holes (3), the second easer holes (4), the third easer holes (5) and the periphery holes (6) are sequentially arranged from the LUS00151 inside out; and the row spacing between the cutting holes (2) and the cut holes (1) is less than the row spacing between the first easer holes (3) and the second easer holes (4), and less than the row spacing between the second easer holes (4) and the third easer holes (5).
4. The closed free face cut blasting method capable of improving blasting efficiency according to claim 2, characterized in that the cartridges with a controlled crack propagation direction are cavity-type energy relief seam cartridges.
5. The closed free face cut blasting method capable of improving blasting efficiency according to claim 4, characterized in that an explosive chamber (9) and a cavity (10) are arranged in each of the cavity-type energy relief seam cartridges, and an energy relief seam (11) is formed in the cavity (10).
6. The closed free face cut blasting method capable of improving blasting efficiency according to claim 4, characterized in that the energy relief seam (11) is provided with energy relief seam angles (12) on both sides, and the energy relief seam angles (12) range from 45° to 75°.
7. The closed free face cut blasting method capable of improving blasting efficiency according to claim 4, characterized in that the explosive chamber (9) is filled with explosives, and the cavity (10) is filled with a rubber pad wave-blocking material.
8. The closed free face cut blasting method capable of improving blasting efficiency according to claim 2, characterized in that a plurality of empty holes (8) are also arranged between any two cutting holes (2) loaded with cartridges.
9. The closed free face cut blasting method capable of improving blasting efficiency according to claim 2, characterized in that the millisecond blasting LUS00151 sequence is that the cutting holes (2) are detonated, and then the cut holes (1), the first circle of easer holes (3), the second circle of easer holes (4), the third circle of easer holes (5) and the periphery holes (6) are sequentially detonated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU500151A LU500151B1 (en) | 2021-05-12 | 2021-05-12 | Closed Free Face Cut Blasting Method Capable of Improving Blasting Efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU500151A LU500151B1 (en) | 2021-05-12 | 2021-05-12 | Closed Free Face Cut Blasting Method Capable of Improving Blasting Efficiency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU500151B1 true LU500151B1 (en) | 2021-11-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU500151A LU500151B1 (en) | 2021-05-12 | 2021-05-12 | Closed Free Face Cut Blasting Method Capable of Improving Blasting Efficiency |
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| Country | Link |
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| LU (1) | LU500151B1 (en) |
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2021
- 2021-05-12 LU LU500151A patent/LU500151B1/en active IP Right Grant
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|---|---|---|---|
| FG | Patent granted |
Effective date: 20211112 |