CN210440032U - Fan-shaped medium-length hole charging structure - Google Patents
Fan-shaped medium-length hole charging structure Download PDFInfo
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- CN210440032U CN210440032U CN201921558847.6U CN201921558847U CN210440032U CN 210440032 U CN210440032 U CN 210440032U CN 201921558847 U CN201921558847 U CN 201921558847U CN 210440032 U CN210440032 U CN 210440032U
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Abstract
The utility model relates to the technical field of mining, and provides a fan-shaped medium-length hole charging structure, which comprises an ore body, a first blast hole row and a second blast hole row, wherein a segmented rock drilling roadway is arranged in the ore body; the first blast hole row comprises first blast holes, one ends of the first blast holes are communicated with the subsection rock drilling roadway, and the number of the first blast holes is even; the second blast hole row comprises second blast holes, one ends of the second blast holes are communicated with the sectional rock drilling roadway, and the number of the second blast holes is odd; the first blast hole row and the second blast hole row are arranged at intervals along the extending direction of the sectional rock drilling roadway, and the first blast holes and the second blast holes are arranged in a staggered mode. The first blast holes of the first blast hole row and the second blast holes of the second blast hole row are arranged in a staggered mode, so that the number of the blast holes can be reduced when the holes are uniformly distributed, the drilling cost is reduced, the unit consumption of explosive is reduced, the production efficiency is improved, and the range of ores which are not blasted can be reduced.
Description
Technical Field
The utility model relates to a mining technology field especially relates to a fan-shaped medium-length hole loaded constitution.
Background
In underground mining of metal ores, a segmented open stope subsequent filling method is widely used for mining at present. When the mining method is used, the subsections need to be divided, and each subsection is mined by adopting a medium-length hole blasting method. The current adopted hole distribution mode of the medium-length hole is that each row of blast holes adopts the same arrangement, namely the mode that adjacent rows of blast holes are arranged in parallel, and under the condition, a larger range of ores exist between rows and are not subjected to the blasting action.
Meanwhile, in the conventional medium-length hole blasting mode, a mode of sequentially starting blasting row by row and then pushing back is mostly adopted. Due to the fact that the number of free surfaces is small, the front row blast hole blasting has serious impact on the rear row blast hole, the blasting effect of the rear row blast hole is affected, and the large block rate is increased easily. And because row-by-row detonating is adopted, the stress interaction of two adjacent rows of blast holes cannot be exerted, and the blasting energy cannot be fully utilized.
SUMMERY OF THE UTILITY MODEL
It is a primary object of the present disclosure to overcome at least one of the above-mentioned deficiencies of the prior art and to provide a fan-shaped medium-length hole charge configuration.
The utility model provides a fan-shaped medium-length hole loaded constitution, include:
the rock drilling device comprises an ore body, a rock drilling machine and a rock drilling machine, wherein a sectional rock drilling roadway is arranged in the ore body;
the first blast hole row comprises first blast holes, one ends of the first blast holes are communicated with the subsection rock drilling roadway, and the number of the first blast holes is even;
the second blast hole row comprises second blast holes, one ends of the second blast holes are communicated with the subsection rock drilling roadway, and the number of the second blast holes is odd;
the first blast hole row and the second blast hole row are arranged at intervals along the extending direction of the sectional rock drilling roadway, and the first blast holes and the second blast holes are arranged in a staggered mode.
In an embodiment of the present invention, the first blast hole row includes a first vertical sector hole group and a second vertical sector hole group, each of the first vertical sector hole group and the second vertical sector hole group includes a plurality of first blast holes equal in number, the center lines of the plurality of first blast holes of the first vertical sector hole group all intersect at the first central point, and the center lines of the plurality of first blast holes of the second vertical sector hole group all intersect at the second central point;
the second gun hole row comprises a third vertical sector hole group, a fourth vertical sector hole group and a second gun hole positioned between the third vertical sector hole group and the fourth vertical sector hole group, the third vertical sector hole group and the fourth vertical sector hole group respectively comprise a plurality of second gun holes with equal number, the central lines of the plurality of second gun holes of the third vertical sector hole group are intersected at a third central point, and the central lines of the plurality of second gun holes of the fourth vertical sector hole group are intersected at a fourth central point;
and connecting lines among the first central point, the second central point and the central line of the second blast hole positioned between the third vertical sector hole group and the fourth vertical sector hole group are triangular.
In an embodiment of the present invention, a first blast hole adjacent to the first vertical sector hole group and the second vertical sector hole group extends in the vertical direction, and other first blast holes of the first vertical sector hole group are all inclined to a first blast hole arrangement extending in the vertical direction toward the first direction;
the second vertical fan-shaped hole group and a first blast hole adjacent to the first vertical fan-shaped hole group extend along the vertical direction, and other first blast holes of the second vertical fan-shaped hole group are inclined to the first blast hole extending along the vertical direction towards the second direction.
In one embodiment of the present invention, a second perforation located between the third vertical sector hole group and the fourth vertical sector hole group extends in the vertical direction;
and a plurality of second blast holes of the fourth vertical sector hole group are arranged obliquely to the second blast holes extending along the vertical direction towards the second direction.
In an embodiment of the invention, the number of first blastholes of a first row of blastholes is one more than the number of second blastholes of a second row of blastholes.
In one embodiment of the utility model, the number of the first blast hole row is 1 ≦ a ≦ 3, the number of the second blast hole row is b, 1 ≦ b ≦ 2;
wherein, the first big gun hole row and the second big gun hole row are arranged in a staggered way.
In an embodiment of the present invention, the connecting line between the first central point, the second central point, and the central line of the second blast hole located between the third vertical sector hole group and the fourth vertical sector hole group is an isosceles triangle.
The utility model discloses a fan-shaped medium-length hole loaded constitution can be in reducible big gun hole quantity in even cloth hole through the first big gun hole of first big gun hole row and the second big gun hole staggered arrangement of second big gun hole row, has reduced the drilling cost, has reduced the explosive unit consumption, improves production efficiency to can reduce the ore scope that does not receive the blasting.
Drawings
Various objects, features and advantages of the present disclosure will become more apparent from the following detailed description of preferred embodiments thereof, when considered in conjunction with the accompanying drawings. The drawings are merely exemplary illustrations of the disclosure and are not necessarily drawn to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:
FIG. 1 is a schematic illustration of a portion of a fan-shaped medium-length hole charge configuration according to an exemplary embodiment;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a schematic cross-sectional view at C-C in FIG. 1;
fig. 5 is a schematic sectional view at D-D in fig. 1.
The reference numerals are explained below:
10. an ore body; 11. performing subsection rock drilling on a roadway; 13. blasting ore; 14. a gob; 20. a first blast hole row; 21. a first blast hole; 22. a first center point; 23. a second center point; 30. a second row of blast holes; 31. a second blast hole; 32. a third center point; 33. a fourth center point; 41. a first layer of V-shaped free surfaces; 42. a second layer of V-shaped free surfaces; 43. a third layer of V-shaped free surface; 44. a fourth layer of V-shaped free surface; 45. a fifth V-shaped free surface; 46. a sixth layer of V-shaped free surfaces; 47. and a seventh layer of V-shaped free surfaces.
Detailed Description
Exemplary embodiments that embody features and advantages of the present disclosure are described in detail below in the specification. It is to be understood that the disclosure is capable of various modifications in various embodiments without departing from the scope of the disclosure, and that the description and drawings are to be regarded as illustrative in nature, and not as restrictive.
In the following description of various exemplary embodiments of the disclosure, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration various exemplary structures in which aspects of the disclosure may be practiced. Other specific arrangements of systems and steps, and structural and functional modifications may be made without departing from the scope of the present disclosure. Moreover, although the terms "over", "between", "within", and the like may be used in this specification to describe various example features and elements of the disclosure, these terms are used herein for convenience only, e.g., in accordance with the orientation of the examples in the drawings. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures in order to fall within the scope of this disclosure.
An embodiment of the utility model provides a fan-shaped medium-length hole charge structure, please refer to fig. 1 to 5, fan-shaped medium-length hole charge structure includes: the rock drilling machine comprises an ore body 10, wherein a sectional rock drilling roadway 11 is arranged inside the ore body 10; the first blast hole row 20 comprises first blast holes 21, one ends of the first blast holes 21 are communicated with the subsection rock drilling roadway 11, and the number of the first blast holes 21 is even; a second gun hole row 30, wherein the second gun hole row 30 comprises second gun holes 31, one ends of the second gun holes 31 are communicated with the sectional rock drilling roadway 11, and the number of the second gun holes 31 is odd; the first blast hole row 20 and the second blast hole row 30 are arranged at intervals along the extending direction of the sectional rock drilling roadway 11, and the first blast holes 21 and the second blast holes 31 are arranged in a staggered mode.
The utility model discloses a fan-shaped medium-length hole loaded constitution of one embodiment can be in reducible big gun hole quantity in even cloth hole through the first big gun hole 21 of first big gun hole row 20 and the second big gun hole 31 staggered arrangement of second big gun hole row 30, has reduced drilling cost, has reduced the explosive unit consumption, improves production efficiency to can reduce the ore scope that does not receive the blasting.
In an embodiment, the first gun hole row 20 and the second gun hole row 30 are arranged at intervals along the extending direction of the sectional rock drilling roadway 11, and the first gun holes 21 and the second gun holes 31 are arranged in a staggered manner, that is, it can be understood that one second gun hole 31 is inserted between two adjacent first gun holes 21, where the insertion is only in a spatial relationship, and the two first gun holes 21 and the one second gun hole 31 are not in a straight line and can be interpreted as being respectively located at three vertex positions of a triangle, where a vertex can be understood as a central point of a port of a gun hole.
In one embodiment, the first blast hole 21 and the second blast hole 31 are drilled upwards from the inside of the sectional rock drilling roadway 11, the goaf 14 can be above the sectional rock drilling roadway 11, and neither the first blast hole 21 nor the second blast hole 31 is communicated with the goaf 14.
In one embodiment, between the ore body 10 and the blasting ore is a blasting section, i.e. a blasting section divided at a time, and the first row of blastholes 20 and the second row of blastholes 30 are distributed in the blasting section.
As shown in fig. 2 and 3, the first row of blast holes 20 includes a first vertical sector group of blast holes and a second vertical sector group of blast holes, each of the first and second vertical sector groups includes a plurality of first blast holes 21 equal in number, the center lines of the plurality of first blast holes 21 of the first vertical sector group intersect at a first central point 22, and the center lines of the plurality of first blast holes 21 of the second vertical sector group intersect at a second central point 23; the second blast hole row 30 comprises a third vertical sector hole group, a fourth vertical sector hole group and a second blast hole 31 positioned between the third vertical sector hole group and the fourth vertical sector hole group, the third vertical sector hole group and the fourth vertical sector hole group respectively comprise a plurality of second blast holes 31 with the same number, the central lines of the plurality of second blast holes 31 of the third vertical sector hole group are intersected at a third central point 32, and the central lines of the plurality of second blast holes 31 of the fourth vertical sector hole group are intersected at a fourth central point 33; wherein, the connecting line between the first central point 22, the second central point 23 and the central line of the second gun hole 31 between the third vertical sector hole group and the fourth vertical sector hole group is triangular.
In one embodiment, the first row of blastholes 20 employs a bi-centric fan-shaped hole, i.e., the first row of blastholes 20 includes a first vertical set of fan-shaped holes and a second vertical set of fan-shaped holes. Wherein the centre line of each first blasthole 21 of the first vertical sector hole group diverges outwardly along the first centre point 22, and the plane formed by the centre lines of each first blasthole 21 forms a sector. Whereas the centre lines of the first blastholes 21 of the second vertical sector group diverge outwardly along the second centre point 23, the planes formed by the centre lines of the first blastholes 21 forming a sector.
In one embodiment, the second row of holes 30 is a double-centre sector, but has a second hole 31 in the middle, which second hole 31 is located centrally, i.e. the second row of holes 30 comprises a third vertical sector, a fourth vertical sector and a second hole 31 located between the third and fourth vertical sectors, the centre line of each second hole 31 of the third vertical sector diverging outwardly along a third centre point 32, the plane formed by the centre lines of each second hole 31 forming a sector. The centre lines of the second blastholes 31 of the fourth vertical sector group diverge outwardly from a fourth centre point 33, the planes formed by the centre lines of the second blastholes 31 forming a sector.
As shown in fig. 2, one first blast hole 21 of the first vertical sector hole group adjacent to the second vertical sector hole group extends in the vertical direction, and the other first blast holes 21 of the first vertical sector hole group are each disposed obliquely to the one first blast hole 21 extending in the vertical direction toward the first direction; the second vertical sector hole group and a first blast hole 21 adjacent to the first vertical sector hole group extend along the vertical direction, and other first blast holes 21 of the second vertical sector hole group are all inclined to one first blast hole 21 extending along the vertical direction towards the second direction.
In one embodiment, the first direction and the second direction refer to two different directions of rotation in one circumferential direction, i.e. can be understood as clockwise and counterclockwise, where an arrangement oblique to one first borehole 21 extending in the vertical direction towards the first direction and an arrangement oblique to one first borehole 21 extending in the vertical direction towards the second direction can both be understood as being oblique in two different directions in the circumferential direction.
In one embodiment, the first row of holes 20 comprises two first holes 21 extending in the vertical direction, i.e. the two first holes 21 located in the center of the first row of holes 20 extend in the vertical direction, while the other first holes 21 are symmetrically distributed on both sides of the two first holes 21 located in the center and are both inclined to the first holes 21 extending in the vertical direction.
In one embodiment, the first rows of holes 20 should have an angle of the first holes 21 to the vertical of not more than 70 °, i.e. the angle of the edge holes to the horizontal should not be less than 20 °, in order to avoid perforation difficulties.
As shown in FIG. 3, a second borehole 31 between the third and fourth vertical sector hole sets extends in the vertical direction; wherein, a plurality of second big gun holes 31 of the third vertical sector hole group are all set up towards the first direction and are oblique to the second big gun holes 31 that extend along the vertical direction, and a plurality of second big gun holes 31 of the fourth vertical sector hole group are all set up towards the second direction and are oblique to the second big gun holes 31 that extend along the vertical direction.
In one embodiment, the first direction and the second direction refer to two different directions of rotation in one circumferential direction, i.e. may be understood as clockwise and anticlockwise, where the arrangement oblique to the second borehole 31 extending in the vertical direction towards the first direction and the arrangement oblique to the second borehole 31 extending in the vertical direction towards the second direction may both be understood as being oblique in two different directions in the circumferential direction.
In one embodiment, the second row 30 of holes comprises a second hole 31 extending in the vertical direction, i.e. a second hole 31 located in the center of the second row 30 of holes extends in the vertical direction, and the other second holes 31 are symmetrically distributed on both sides of the centrally located second hole 31 and are inclined to the second holes 31 extending in the vertical direction.
In one embodiment, the number of first blastholes 21 of a first row of blastholes 20 is one greater than the number of second blastholes 31 of a second row of blastholes 30.
In one embodiment, the number of the first rows of blastholes 20 is 1 ≦ a ≦ 3, the number of the second rows of blastholes 30 is b, 1 ≦ b ≦ 2; wherein the first rows of blastholes 20 are staggered with the second rows of blastholes 30. The number of first rows 20 and second rows 30 is limited primarily to reduce the number of segments used to improve burst stability.
In one embodiment, the connecting line between first center point 22, second center point 23, and the centerline of second borehole 31 between the third vertical sector hole set and the fourth vertical sector hole set is an isosceles triangle.
In one embodiment, to improve the blasting effect, the second holes 31 of the second row 30 should be located as far as possible in the middle of the first holes 21 of the first row 20, and the plurality of second holes 31 and the plurality of first holes 21 should be uniformly distributed in the plane.
An embodiment of the utility model also provides a fan-shaped medium-length hole blasting method, include: arranging a first blast hole row 20 and a second blast hole row 30 on an ore body 10 along the extension direction of a sectional rock drilling roadway 11, wherein the first blast hole row 20 and the second blast hole row 30 both adopt a hole distribution design of double-center fan-shaped holes, and a first blast hole 21 of the first blast hole row 20 and a second blast hole 31 of the second blast hole row 30 are arranged in a staggered manner; and (3) charging the first blast hole 21 and the second blast hole 31, adopting millisecond differential blasting, and successively detonating from the central positions of the first blast hole row 20 and the second blast hole row 30 to two sides, wherein the rows are blasted from front to back to form a V-shaped free surface which is continuously enlarged until the stoping is finished.
In one embodiment, each of the first row of blastholes 20 and the second row of blastholes 30 forming a V-shaped free surface is detonated simultaneously.
In one embodiment, the fan-shaped medium-length hole blasting method is applied to the fan-shaped medium-length hole charging structure.
In one embodiment, a particular method of arranging the first row of blastholes 20 and the second row of blastholes 30 includes: arranging a plurality of first blast holes 21 to form a first blast hole row 20, and arranging second blast holes 31 alternately between two adjacent first blast holes 21 to form a second blast hole row 30; wherein, a connecting line between two adjacent first blast holes 21 and the second blast hole 31 interpenetrated therebetween is triangular.
In one embodiment, a particular method of initiation for the first row of blastholes 20 and the second row of blastholes 30 includes: two first blast holes 21 in the center of the first blast hole row 20 are detonated first, and then symmetrical pairs of first blast holes 21 on both sides of the center are detonated successively; a second blast hole 31 in the center of the second blast hole row 30 is detonated first, and then symmetrical pairs of second blast holes 31 on both sides of the center are detonated successively; after a V-shaped free surface is formed, each pair of first blastholes 21 and each pair of second blastholes 31 on two sides of the V-shaped free surface are detonated first.
In one embodiment, after forming a V-shaped free surface, each pair of first blastholes 21 and each pair of second blastholes 31 on both sides of the V-shaped free surface are detonated simultaneously.
In one embodiment, a first row of holes 20 comprises 12 first holes 21, a second row of holes 30 comprises 11 second holes 31, three first rows of holes 20 and two second rows of holes 30 are arranged such that the first row of holes 20 is staggered with respect to the second row of holes 30, the three first rows of holes 20 and the two second rows of holes 30 form 5 rows of holes, and the specific steps of blasting comprise:
(1) two first blastholes 21 positioned at the center of the first blast hole row 20 of the first row are detonated;
(2) the second blast holes 31 positioned at the center positions of the second blast hole rows 30 of the second row are detonated to form a first layer of V-shaped free surface 41;
(3) adjacent blastholes in the first row and the second row close to the first layer of V-shaped free surface 41 are detonated;
(4) two first blastholes 21 positioned at the center of the first blasthole row 20 of the third row are detonated;
(5) the second blast holes 31 positioned at the center positions of the second blast hole rows 30 of the fourth row are detonated to form a second layer of V-shaped free surfaces 42;
(6) adjacent blastholes in the first, second, third and fourth rows adjacent to the second tier V-shaped free surface 42 are detonated;
(7) two first blastholes 21 positioned at the center of the first blasthole row 20 of the fifth row are detonated to form a third layer of V-shaped free surface 43;
(8) adjacent blastholes in the first row, the second row, the third row, the fourth row and the fifth row close to the third layer of V-shaped free surface 43 are detonated to form a fourth layer of V-shaped free surface 44;
(9) adjacent blastholes in the first row, the second row, the third row, the fourth row and the fifth row close to the fourth layer of V-shaped free surface 44 are detonated to form a fifth layer of V-shaped free surface 45;
(10) adjacent blastholes in the second, third, fourth and fifth rows near the fifth layer V-shaped free surface 45 are detonated to form a sixth layer of V-shaped free surfaces 46;
(11) adjacent blastholes in the third, fourth and fifth rows near the sixth layer of V-shaped free surfaces 46 are detonated to form a seventh layer of V-shaped free surfaces 47;
(12) in the fifth row, adjacent blast holes close to the seventh layer of V-shaped free surface 47 are detonated to complete all blasting;
when the number of rows of blast holes is less than 5, and the rows are two, the blasting part carries out the steps (1), (2), (3), (6), (8), (9) and (10), and the blast holes in the third row, the fourth row and the fifth row are ignored; if the number of rows is three, the blasting part carries out the steps (1) (2), (3), (4), (6), (8), (9), (10) (11), and holes in the fourth row and the fifth row are ignored; in the case of four rows, the blasting section proceeds to steps (1) (2), (3), (4), (5), (6), (8), (9), (10), (11), omitting the fifth row of holes.
The utility model discloses a fan-shaped medium-length hole blasting method is a row crisscross high-efficient medium-length hole blasting method within a definite time, explains to a concrete mining embodiment.
In the embodiment, ore is mined by an open stope filling method after ore removal in a sectional rock drilling stage, a chamber is arranged perpendicular to the trend of an ore body, the height of the stage is 50m, the height of the section is 12.5m, the width of the chamber is 12.5m, the length of a stope is 80m, and medium-length hole blasting is currently performed in a middle section of +90 m. The burial depth of the chamber is shallow, and the chamber is close to a village nearby, and the blasting environment is complex.
The concrete steps in the embodiment are as follows:
(1) and selecting blasting parameters, and respectively determining blasting parameters such as unit consumption of explosive, hole bottom distance, hole opening distance, row spacing, ore caving step distance and the like according to actual conditions on site by referring to mining handbooks.
The diameter of the medium-length hole blast holes (the first blast hole 21 and the second blast hole 31) is 76mm, the unit consumption of explosive is 0.38kg/t, the density of emulsion explosive is 1.1g/cm3, the row pitch is 1.4m-1.8m, the hole opening pitch is 0.8m-1.3m, the hole bottom pitch is 1.8m-2.5m, four rows of blast holes are blasted at one time, and the ore caving step pitch is 5.5m-6.5 m.
The maximum allowable single-section blasting explosive quantity is calculated according to the requirements of blasting safety regulation and the formula of Sadow Fuji. The formula of Sadow-fusi is:
wherein V is the vibration velocity
K is a field coefficient;
α is the attenuation coefficient;
q is the single-stage maximum dose;
and R is the distance between the measuring point and the blasting position.
Because an adobe room and a rubble room exist in the nearest village, the allowed maximum vibration speed is 0.8cm/s, the minimum distance between a measuring point and a blasting place is 400m, and other parameters are obtained according to a blasting vibration test. The maximum drug amount per fraction was calculated to be 638.22 kg.
(2) According to the actual stope structure parameters, carrying out hole arrangement design of a first set of double-center vertical fan-shaped holes (hole arrangement design of a first blast hole row 20): 12 first blast holes 21 are arranged, 12 blast holes are arranged in a single row of double-center fan-shaped holes, the blast holes are vertically arranged upwards, the inclination angle is 90 degrees, and the inclination angle of the corner holes is 23 degrees upwards. According to the hole arrangement design result, second holes 31 are inserted among the first holes 21, and the inserted second holes 31 form a second set of double-center fan-shaped hole arrangement design (the hole arrangement design of the second hole row 30). The hole distribution design of the second set of double-center fan-shaped holes is totally provided with 11 second blast holes 31, the blast holes are vertically arranged upwards, and the inclination angle is 90 degrees.
(3) Hole distribution: and (3) distributing holes according to the principle that the hole distribution design of the first set of double-center fan-shaped holes and the hole distribution design of the second set of double-center fan-shaped holes are mutually staggered, wherein the hole distribution starts from the hole distribution design of the first set of double-center fan-shaped holes.
(4) Drilling and charging: and drilling is carried out by adopting the medium-length hole drilling trolley, and the charging work is finished by adopting the charging trolley.
(5) Blasting: the blasting adopts millisecond differential blasting, the blasting sequence is that the blasting is carried out from the central position to two sides one by one, and the blasting is carried out from front to back between rows to form a V-shaped free surface which is continuously expanded. According to the maximum allowable blasting explosive quantity calculated in the first step, the blasting hole initiation sequence is divided into 16 sections according to the principle that a continuously retreating V-shaped free surface is formed in the blasting process, and the sections 1 to 16 can be specifically seen in fig. 1, 4 and 5.
The parameters of each row of blast holes are shown in tables 1, 2, 3, 4 and 5, wherein L in the tables is the left blast hole in the figure 2 or 3, and R is the right blast hole in the figure 2 or 3.
TABLE 1
TABLE 2
TABLE 3
TABLE 4
TABLE 5
The specific initiation sequence aiming at the scheme is as follows:
(1) two first blastholes 21 positioned at the center of the first blast hole row 20 of the first row are detonated;
(2) the second blast hole 31 positioned at the center of the second blast hole row 30 of the second row is detonated to form a first layer of V-shaped free surface 41, namely the first layer of V-shaped free surface 41 is formed after 1 section and 2 sections are blasted;
(3) adjacent blastholes in the first row and the second row close to the first layer of V-shaped free surface 41 are detonated;
(4) two first blastholes 21 positioned at the center of the first blasthole row 20 of the third row are detonated;
(5) the second blast holes 31 positioned at the center of the second blast hole row 30 of the fourth row are detonated to form a second layer of V-shaped free surfaces 42, namely, the second layer of V-shaped free surfaces 42 are formed after 3 sections, 4 sections and 5 sections are blasted;
(6) adjacent blastholes in the first, second, third and fourth rows adjacent to the second tier V-shaped free surface 42 are detonated;
(7) two first blast holes 21 positioned at the center of the first blast hole row 20 of the fifth row are detonated to form a third layer of V-shaped free surface 43, namely, the third layer of V-shaped free surface 43 is formed after 6 sections, 7 sections and 8 sections are blasted;
(8) adjacent blast holes close to the third layer of V-shaped free surface 43 in the first row, the second row, the third row, the fourth row and the fifth row are detonated to form a fourth layer of V-shaped free surface 44, namely the fourth layer of V-shaped free surface 44 is formed after 9 sections, 10 sections and 11 sections are blasted;
(9) adjacent blast holes close to the fourth layer of V-shaped free surface 44 in the first row, the second row, the third row, the fourth row and the fifth row are detonated to form a fifth layer of V-shaped free surface 45, namely a fifth layer of V-shaped free surface 45 is formed after 12 sections and 13 sections of blasting;
(10) adjacent blast holes in the second row, the third row, the fourth row and the fifth row close to the fifth layer V-shaped free surface 45 are detonated to form a sixth layer of V-shaped free surfaces 46, namely the sixth layer of V-shaped free surfaces 46 are formed after 14 sections of blasting;
(11) adjacent blast holes in the third row, the fourth row and the fifth row close to the sixth layer of V-shaped free surface 46 are detonated to form a seventh layer of V-shaped free surface 47, namely the seventh layer of V-shaped free surface 47 is formed after 15 sections of blasting;
(12) the adjacent blastholes in the fifth row near the seventh layer of V-shaped free face 47 are detonated to complete the full blast, i.e., the final 16 shots.
The utility model discloses a fan-shaped medium-length hole blasting method is the crisscross high-efficient medium-length hole blasting method in simple effectual row, through forming the V-arrangement free surface that constantly enlarges, has increased the free surface number, has improved the blasting effect. And because the blast holes in multiple rows are blasted simultaneously, the stress action of the blast holes in the rows is improved, and the utilization rate of blasting energy is increased. Meanwhile, due to the adoption of the principle of arranging the staggered blast holes among rows, the quantity of the blast holes can be reduced while the holes are uniformly distributed, the drilling cost is reduced, the unit consumption of explosive is reduced, and the production efficiency is improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and exemplary embodiments be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
Claims (7)
1. A fan-shaped medium-length hole charging structure is characterized by comprising:
an ore body (10), the interior of the ore body (10) is provided with a sectional rock drilling roadway (11);
the first blast hole row (20), the first blast hole row (20) comprises first blast holes (21), one ends of the first blast holes (21) are communicated with the subsection rock drilling roadway (11), and the number of the first blast holes (21) is even;
the second blast hole row (30) comprises second blast holes (31), one ends of the second blast holes (31) are communicated with the subsection rock drilling roadway (11), and the number of the second blast holes (31) is odd;
the first blast hole row (20) and the second blast hole row (30) are arranged at intervals along the extending direction of the subsection rock drilling roadway (11), and the first blast holes (21) and the second blast holes (31) are arranged in a staggered mode.
2. A fan-shaped medium-length hole charging structure according to claim 1, wherein the first row of blastholes (20) comprises a first vertical sector-shaped group of holes and a second vertical sector-shaped group of holes, the first and second vertical sector-shaped groups of holes each comprise an equal number of the first blastholes (21), the center lines of the first blastholes (21) of the first vertical sector-shaped group of holes each intersect at a first central point (22), and the center lines of the first blastholes (21) of the second vertical sector-shaped group of holes each intersect at a second central point (23);
the second gun hole row (30) comprises a third vertical sector hole group, a fourth vertical sector hole group and one second gun hole (31) positioned between the third vertical sector hole group and the fourth vertical sector hole group, the third vertical sector hole group and the fourth vertical sector hole group respectively comprise a plurality of second gun holes (31) with the same number, the central lines of the second gun holes (31) of the third vertical sector hole group are intersected at a third central point (32), and the central lines of the second gun holes (31) of the fourth vertical sector hole group are intersected at a fourth central point (33);
wherein a connecting line between the first center point (22), the second center point (23) and a center line of the second blast hole (31) between the third vertical sector hole group and the fourth vertical sector hole group is triangular.
3. A fan-shaped medium-length hole charging structure according to claim 2, wherein one of the first blast holes (21) of the first vertical sector hole group adjacent to the second vertical sector hole group extends in a vertical direction, and the other first blast holes (21) of the first vertical sector hole group are each disposed obliquely to the one of the first blast holes (21) extending in the vertical direction toward the first direction;
the second vertical sector hole group and the first blast hole (21) adjacent to the first vertical sector hole group extend in the vertical direction, and the other first blast holes (21) of the second vertical sector hole group are inclined to one extending in the vertical direction towards the second direction, and the first blast holes (21) are arranged.
4. A fan-shaped medium-length hole charge structure according to claim 3, wherein one of the second blastholes (31) located between the third vertical sector hole group and the fourth vertical sector hole group extends in a vertical direction;
the second blast holes (31) of the third vertical sector hole group face the first direction obliquely to the second blast holes (31) extending in the vertical direction, and the second blast holes (31) of the fourth vertical sector hole group face the second direction obliquely to the second blast holes (31) extending in the vertical direction.
5. A fan-shaped medium-length hole charge structure according to any one of claims 2 to 4, characterized in that the number of the first blastholes (21) of one of the first rows (20) of blastholes is one more than the number of the second blastholes (31) of one of the second rows (30) of blastholes.
6. The fan-shaped medium-length hole charging structure according to claim 2, wherein the number of the first blast hole rows (20) is 1-3, the number of the second blast hole rows (30) is b, 1-2;
wherein the first row of blastholes (20) and the second row of blastholes (30) are staggered.
7. A fan-shaped medium-length hole charge structure according to claim 2, characterized in that a connecting line between the first central point (22), the second central point (23) and the centre line of the second blasthole (31) between the third and fourth vertical sector-hole groups is an isosceles triangle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921558847.6U CN210440032U (en) | 2019-09-18 | 2019-09-18 | Fan-shaped medium-length hole charging structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110454158A (en) * | 2019-09-18 | 2019-11-15 | 中国恩菲工程技术有限公司 | Fan shaped medium length hole charge constitution and fan shaped medium length hole blasting method |
| CN111810156A (en) * | 2020-08-11 | 2020-10-23 | 昆明理工大学 | Improved sublevel chamber mining method |
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2019
- 2019-09-18 CN CN201921558847.6U patent/CN210440032U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110454158A (en) * | 2019-09-18 | 2019-11-15 | 中国恩菲工程技术有限公司 | Fan shaped medium length hole charge constitution and fan shaped medium length hole blasting method |
| CN111810156A (en) * | 2020-08-11 | 2020-10-23 | 昆明理工大学 | Improved sublevel chamber mining method |
| CN111810156B (en) * | 2020-08-11 | 2021-07-09 | 昆明理工大学 | Improved sublevel chamber mining method |
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