CN112747643A - IV-level surrounding rock blasting method suitable for drilling of three-arm rock drilling jumbo - Google Patents
IV-level surrounding rock blasting method suitable for drilling of three-arm rock drilling jumbo Download PDFInfo
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- CN112747643A CN112747643A CN202011610524.4A CN202011610524A CN112747643A CN 112747643 A CN112747643 A CN 112747643A CN 202011610524 A CN202011610524 A CN 202011610524A CN 112747643 A CN112747643 A CN 112747643A
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- 239000011435 rock Substances 0.000 title claims abstract description 52
- 238000005553 drilling Methods 0.000 title claims abstract description 43
- 238000005422 blasting Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000009412 basement excavation Methods 0.000 claims abstract description 9
- 239000002360 explosive Substances 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims description 24
- 238000010276 construction Methods 0.000 abstract description 9
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C25/00—Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
- E21C25/66—Machines for making slits with additional arrangements for drilling
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- 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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- 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
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses an IV-level surrounding rock blasting method suitable for drilling of a three-arm rock drilling jumbo, and relates to the technical field of tunnel construction, wherein the method comprises the following steps: confirm excavation boundary, set up the slotted hole with three-arm drill jumbo, step such as installation explosive and blasting, through having set up central undermining hole, left side central undermining hole and right side central undermining hole at the face in tunnel, the rock that can effective broken central point put reduces the production of bold rock, does benefit to shovel dress rock piece, is favorable to the rock between left side undermining hole, the right side undermining hole to collapse, thereby improve the efficiency of blasting, reach the smooth mesh of face after the blasting, improve tunnel construction safety.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a method for blasting IV-grade surrounding rock suitable for drilling of a three-arm rock drilling jumbo.
Background
In tunnel construction engineering, excavation and tunneling of tunnels are always the key subjects of research and practice, and in long and large tunnel engineering, large-scale mechanized construction equipment is widely applied, wherein a three-arm rock drilling trolley is the most typical, the three-arm rock drilling trolley is used for drilling a blast hole on rock to be blasted, explosive is placed in the blast hole to blast the rock, the three-arm rock drilling trolley has short drilling time and has the characteristics of one-time hole forming, accurate positioning and the like, the three-arm rock drilling trolley is key equipment in tunnel excavation and support construction, and the structure and the position of the blast hole have great influence on the rock blasting effect, the construction safety and the construction efficiency.
Disclosure of Invention
The invention aims to provide an IV-grade surrounding rock blasting method suitable for drilling of a three-arm rock drilling jumbo, so that the blasting safety and blasting efficiency of the existing IV-grade surrounding rock are improved.
The technical scheme for solving the technical problems is as follows:
a class-IV surrounding rock blasting method suitable for drilling of a three-arm rock drilling jumbo comprises the following steps:
s1, measuring and determining an excavation region and an excavation boundary of the IV-level surrounding rock tunnel;
s2, drilling blast hole for blasting on the face by using the three-arm drill jumbo, wherein the blast hole comprises: the vertical setting is in the central undercut hole group of face central line department, and vertical setting is in central undercut hole group one side in proper order: the tunnel face floor line is also provided with a horizontally arranged bottom plate slotted eye group, a tunnel face peripheral line is provided with a peripheral slotted eye group, and a tunnel face inner ring line at the inner side of the tunnel face peripheral line is provided with an inner ring eye group;
s3, arranging a charging rack, and installing explosives in the slotted holes;
and S4, blasting from the central line of the tunnel face to the two sides in sequence.
Further, in the preferred embodiment of the present invention, in step S2, the central slot hole group includes three central slot holes; the left central slotted hole group and the right central slotted hole group respectively comprise three left central slotted holes and three right central slotted holes which are arranged in a one-to-one correspondence manner; the left side cutting hole group and the right side cutting hole group respectively comprise seven left side cutting holes and seven right side cutting holes which are correspondingly arranged one by one; the first left side slot expanding hole group and the first right side slot expanding hole group respectively comprise four first left side slot expanding holes and four first right side slot expanding holes which are arranged in a one-to-one correspondence manner; the second left slot expanding hole group and the second right slot expanding hole group respectively comprise four second left slot expanding holes and four second right slot expanding holes which are arranged in a one-to-one correspondence manner; the left groove side auxiliary eye group and the right groove side auxiliary eye group respectively comprise three left groove side auxiliary eyes and three right groove side auxiliary eyes which are arranged in a one-to-one correspondence mode; the left root hole eliminating group and the right root hole eliminating group respectively comprise a left root hole eliminating and a right root hole eliminating which are correspondingly arranged; the upper auxiliary slot group comprises five upper auxiliary slots; the bottom plate slot group comprises eleven bottom plate slots; the peripheral slot group comprises thirty-eight peripheral slots; the inner ring slot group comprises twenty-two inner ring slots.
Further, in the preferred embodiment of the present invention, the distances from the three central undermining holes to the tunnel face floor line are respectively: 60cm, 140cm and 220 cm; the distance between three left side center cut holes and three right side center cut holes and the tunnel face floor line is respectively: 60cm, 140cm and 220 cm; the distances from the seven left-side cut holes and the seven right-side cut holes to the floor line of the tunnel face are respectively as follows: 40cm, 80cm, 120cm, 230cm, 270cm, 300cm, 330 cm; the distances from the four first left-side slot expanding holes and the four first right-side slot expanding holes to the floor line of the tunnel face are respectively as follows: 60cm, 150cm, 230cm, 320 cm; the distances from the four second left-side slot expanding holes and the four second right-side slot expanding holes to the floor line of the tunnel face are respectively as follows: 60cm, 150cm, 230cm, 320 cm; the distances from the three left groove side auxiliary eyes and the three right groove side auxiliary eyes to the floor line of the tunnel face are respectively as follows: 60cm, 150cm, 230 cm; the distance between one left bottom eliminating root hole and one right bottom eliminating root hole and the floor line of the tunnel face is respectively as follows: 60 cm; the distance between the adjacent upper auxiliary slotted holes (8) is 80 cm: the distance between adjacent bottom plate slots is 100 cm: the distance between adjacent peripheral grove holes is 50 cm: the distance between adjacent inner ring grommets is 70 cm.
Further, in a preferred embodiment of the present invention, in step S2, the footage is 4.5m, the tail end of the guide rail beam of the three-arm rock drilling rig is 10cm from the side wall of the side wall and 65cm from the face, the opening position of the drill bit at the front section of the guide rail beam is 100cm, 250cm, 310cm, 370cm, 430cm, 450cm, 540cm and 600cm from the center line of the face, the distance between the hole bottom and the center line of the tunnel is 25cm, 120cm, 220cm, 320cm, 430cm, 540cm, 620cm and 640cm, and the charging stand is 55cm from the face.
In another scheme of the invention, in step S2, the footage size is 3.5m, the tail end of the guide rail beam of the three-arm rock drilling jumbo is 10cm away from the side wall of the side wall and 65cm away from the face, the opening position of the drill bit at the front section of the guide rail beam is 100cm, 245cm, 300cm, 360cm, 420cm, 450cm, 540cm and 600cm away from the center line of the face respectively, the distance between the hole bottom and the center line of the tunnel is 25cm, 120cm, 220cm, 320cm, 430cm, 540cm, 620cm and 640cm respectively, and the charging stand is 55cm away from the face.
Further, in a preferred embodiment of the present invention, plastic detonator detonators are installed in the central slot hole, the left slot hole, the first left reaming hole, the second left reaming hole, the left slot auxiliary hole, the left root eliminating hole, the right central slot hole, the right slotted hole, the first right reaming hole, the second right reaming hole, the right slot auxiliary hole, the right root eliminating hole, the upper auxiliary slot hole and the bottom slot hole, and electric detonators are used for detonating and detonating.
Further, in the preferred embodiment of the invention, an explosive binding detonating cord and a spacing charging structure are arranged in the peripheral eye group.
Further, in the preferred embodiment of the present invention, 1-section plastic detonator is used for the central cutting hole, the left cutting hole, the right central cutting hole and the right cutting hole; the first left-side slot expanding hole and the first right-side slot expanding hole adopt 3 sections of plastic detonating tube detonators; the second right-side groove expanding hole and the second left-side groove expanding hole adopt 5-section plastic detonating tube detonators; the left groove side auxiliary hole, the right groove side auxiliary hole and the upper auxiliary groove hole adopt 7 sections of plastic detonating tube detonators, the left bottom eliminating root hole, the right bottom eliminating root hole and the inner ring groove hole adopt 11 sections of plastic detonating tube detonators, and the peripheral groove hole adopts 13 sections of plastic detonating tube detonators.
The invention has the following beneficial effects:
the invention provides an IV-level surrounding rock blasting method suitable for drilling of a three-arm rock drilling jumbo, wherein a central cut hole, a left central cut hole and a right central cut hole are formed in a tunnel face of a tunnel, so that rocks at the central position can be effectively crushed, the generation of large rocks is reduced, shovel loading of rock blocks is facilitated, and rock collapse between the left cut hole and the right cut hole is facilitated, so that the blasting efficiency is improved, the aim of leveling the tunnel face after blasting is fulfilled, and the tunnel construction safety is improved; according to the invention, the powder is charged by the rack according to the whole drilling and powder charging process, and the rest drilling structures can meet the requirement that the powder charging process is implemented on the rack, so that the powder charging efficiency is greatly improved.
Drawings
FIG. 1 is a view showing the arrangement of the holes of the present invention;
FIG. 2 is a schematic structural view of a footage blasthole angle and a stage arrangement in example 1;
fig. 3 is a schematic structural view of the footage blasthole angle and the stage arrangement in example 2.
Wherein: 1-central cutting hole; 2-central cutting hole at left side; 21-right central cut hole; 3-left side cutting hole; 31-right side cutting hole; 4-a first left-side slot-expanding eye; 41-a first right-hand reaming eye; 5-a second left-side slot expanding eye; 51-a second right-hand reaming eye; 6-left lateral auxiliary eye; 61-right sulcus side auxiliary eye; 7-eliminating bottom root holes; 71-eliminating bottom root hole; 8-upper auxiliary grove hole; 9-bottom plate slot; 10-peripheral grove holes; 11-inner ring grove; 12-palm surface; 121-tunnel face floor line; 122-tunnel face perimeter line; 123-palm inner loop line; 13-charge stand.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example 1
A class-IV surrounding rock blasting method suitable for drilling of a three-arm rock drilling jumbo comprises the following steps:
s1, measuring and determining an excavation region and an excavation boundary of the IV-level surrounding rock tunnel;
s2, drilling blast holes for blasting on the face 12 by using the three-arm drill jumbo, wherein the blast holes comprise: the vertical setting is in the central undercut hole group of 12 central lines departments of face, and vertical setting is in central undercut hole group one side in proper order: a left central slotting group, a left slotting group, a first left reaming group, a second left reaming group, a left auxiliary group and a left root hole group, wherein the other side of the central slotting group is sequentially provided with a left central slotting group, a left slotting group and a first left reaming group, the upper end of the central slotted eye group is provided with a horizontally arranged upper auxiliary slotted eye group, the palm surface floor line 121 is also provided with a horizontally arranged bottom plate slotted eye group, the palm surface peripheral line 122 is provided with a peripheral slotted eye group, and the palm surface inner ring line 123 at the inner side of the palm surface peripheral line 122 is provided with an inner ring slotted eye group;
referring to fig. 1, the central slitting hole group includes three central slitting holes 1; the left central slotted hole group and the right central slotted hole group respectively comprise three left central slotted holes 2 and three right central slotted holes 21 which are arranged in a one-to-one correspondence manner; the left side cutting hole group and the right side cutting hole group respectively comprise ten left side cutting holes 3 and ten right side cutting holes 31 which are arranged in a one-to-one correspondence manner; the first left slot expanding hole group and the first right slot expanding hole group respectively comprise six first left slot expanding holes 4 and six first right slot expanding holes 41 which are arranged in a one-to-one correspondence manner; the second left-side slot expanding hole group and the second right-side slot expanding hole group respectively comprise six second left-side slot expanding holes 5 and six second right-side slot expanding holes 51 which are correspondingly arranged one by one; the left groove side auxiliary eye group and the right groove side auxiliary eye group respectively comprise five left groove side auxiliary eyes 6 and five right groove side auxiliary eyes 61 which are arranged in a one-to-one correspondence manner; the left root hole eliminating group and the right root hole eliminating group respectively comprise three left root holes 7 and three right root holes 71 which are correspondingly arranged one by one; the upper auxiliary slot group comprises five upper auxiliary slots 8; the bottom plate slot group comprises eleven bottom plate slots 9; the peripheral grove group includes thirty-eight peripheral groves 10; the inner ring slot set includes twenty-two inner ring slots 11.
The distances from the three central cutting holes 1 to the tunnel face floor line 121 are respectively as follows: 60cm, 140cm and 220 cm; the distances from the three left central slitting holes 2 and the three right central slitting holes 21 to the tunnel face floor line 121 are respectively: 60cm, 140cm and 220 cm; the distances from the seven left-side cutting holes 3 and the seven right-side cutting holes 31 to the tunnel floor line 121 are respectively as follows: 40cm, 80cm, 120cm, 230cm, 270cm, 300cm, 330 cm; the distances from the four first left-side slot expanding holes and the four first right-side slot expanding holes to the tunnel face floor line 121 are respectively as follows: 60cm, 150cm, 230cm, 320 cm; the distances from the four second left-side slot expanding holes and the four second right-side slot expanding holes to the tunnel face floor line 121 are respectively as follows: 60cm, 150cm, 230cm, 320 cm; the distances from the three left socket side auxiliary eyes 6 and the three right socket side auxiliary eyes 61 to the tunnel face floor line 121 are respectively: 60cm, 150cm, 230 cm; the distance from one left sole eliminating root hole 7 and one right sole eliminating root hole 71 to the tunnel face floor line 121 is respectively as follows: 60cm, the distance between adjacent upper auxiliary grove holes 8 is 80 cm: the distance between adjacent floor slots 9 is 100 cm: the distance between adjacent peripheral slots 10 is 50 cm: the distance between adjacent inner ring grommets 11 is 70 cm.
In this embodiment, when the footage size is 4.5m and each slot is opened, the distance from the tail end of the guide rail beam of the three-arm rock drilling jumbo to the side wall of the side wall is 10cm, the distance from the tail end of the guide rail beam to the face 12 is 65cm, the opening position of the drill bit at the front section of the guide rail beam is 100cm, 250cm, 310cm, 370cm, 430cm, 450cm, 540cm and 600cm from the central line of the face 12, the distances from the hole bottom to the central line of the tunnel are 25cm, 120cm, 220cm, 320cm, 430cm, 540cm, 620cm and 640cm, and the distance from the charging stand 13 to the face 12 is 55 cm.
S3, arranging a charging rack 13, and installing explosives in the slotted holes; plastic detonating tube detonators are arranged in the central cutting hole 1, the left central cutting hole 2, the left cutting hole 3, the first left expanding cutting hole 4, the second left expanding cutting hole 5, the left groove side auxiliary hole 6, the left bottom eliminating root hole 7, the right central cutting hole 21, the right cutting hole 31, the first right expanding cutting hole 41, the second right expanding cutting hole 51, the right groove side auxiliary hole 61, the right bottom eliminating root hole 71, the upper auxiliary cutting hole 8 and the bottom plate cutting hole 9, and electric detonators are adopted for detonating and detonating. Explosive binding detonating cords and spaced charging structures are arranged in the peripheral slots 10. Specifically, 1 section of plastic detonating tube detonators are adopted for the central cutting hole 1, the left central cutting hole 2, the left cutting hole 3, the right central cutting hole 21 and the right cutting hole 31; the first left-side slot expanding hole 4 and the first right-side slot expanding hole 41 adopt 3 sections of plastic detonating tube detonators; the second right-side slot expanding hole 51 and the second left-side slot expanding hole 5 adopt 5-section plastic detonating tube detonators; the left groove side auxiliary hole 6, the right groove side auxiliary hole 61 and the upper auxiliary groove hole 8 adopt 7 sections of plastic detonating tube detonators, the left bottom root eliminating hole 7, the right bottom root eliminating hole 71 and the inner ring groove hole 11 adopt 11 sections of plastic detonating tube detonators, and the peripheral groove hole 10 adopts 13 sections of plastic detonating tube detonators.
And S4, blasting from the central line of the tunnel face 12 to the two sides in sequence.
Example 2
The difference between this embodiment and embodiment 1 is that, in step S2, the footage size is 4.0m, the distance from the tail end of the guide rail beam of the three-arm rock drilling rig to the side wall of the side wall is 10cm, the distance from the tunnel face 12 is 65cm, the distance from the opening position of the drill bit at the front section of the guide rail beam to the center line of the tunnel face 12 is 100cm, 245cm, 300cm, 360cm, 420cm, 450cm, 540cm, 600cm, the distance from the hole bottom to the center line of the tunnel is 25cm, 120cm, 220cm, 320cm, 430cm, 540cm, 620cm, 640cm, and the distance from the charging stand 13 to the tunnel face 12 is 55 cm.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A class-IV surrounding rock blasting method suitable for drilling of a three-arm rock drilling jumbo is characterized by comprising the following steps of:
s1, measuring and determining an excavation region and an excavation boundary of the IV-level surrounding rock tunnel;
s2, drilling blast hole for blasting on the face by using the three-arm drill jumbo, wherein the blast hole comprises: the vertical setting is in the central plunge cut eye group of the central line department of face, and vertical setting is in proper order central plunge cut eye group one side: a left central undermining hole group, a left undermining hole group, a first left side slot expanding hole group, a second left side slot expanding hole group, a left slot side auxiliary hole group and a left bottom-eliminating root hole group, the other side of the central slotting group is sequentially provided with a right central slotting group, a right slotting group, a first right slotting group, a second right slotting group, a left slot side auxiliary eye group and a left bottom eliminating root hole group which are respectively symmetrical with the left central slotting group, the left side slotting group, the first left side slotting group, the second left side slotting group, the left slot side auxiliary eye group and the left bottom eliminating root hole group, the upper end of the central cut-out hole group is provided with a horizontally arranged upper auxiliary cut-out hole group, the palm surface floor line (121) is also provided with a horizontally arranged bottom plate cut-out hole group, the palm surface peripheral line (122) is provided with a peripheral cut-out hole group, an inner ring slot group is arranged on a palm face inner ring line (123) on the inner side of the palm face peripheral line (122);
s3, arranging a explosive loading rack (13), and installing explosives in the slotted holes;
s4, blasting from the central line of the tunnel face (12) to two sides in sequence.
2. The method for blasting surrounding rock of class IV suitable for three-armed drill jumbo drilling according to claim 1, wherein in step S2, the group of central slitting holes comprises three central slitting holes (1);
the left central slotted hole group and the right central slotted hole group respectively comprise three left central slotted holes (2) and three right central slotted holes (21) which are arranged in a one-to-one correspondence manner;
the left side cutting hole group and the right side cutting hole group respectively comprise seven left side cutting holes (3) and seven right side cutting holes (31) which are arranged in a one-to-one correspondence manner;
the first left side slot expanding hole group and the first right side slot expanding hole group respectively comprise four first left side slot expanding holes (4) and four first right side slot expanding holes (41) which are arranged in a one-to-one correspondence manner;
the second left-side slot expanding hole group and the second right-side slot expanding hole group respectively comprise four second left-side slot expanding holes (5) and four second right-side slot expanding holes (51) which are arranged in a one-to-one correspondence manner;
the left groove side auxiliary eye group and the right groove side auxiliary eye group respectively comprise three left groove side auxiliary eyes (6) and three right groove side auxiliary eyes (61) which are arranged in a one-to-one correspondence manner;
the left root hole eliminating group and the right root hole eliminating group respectively comprise a left root hole eliminating hole (7) and a right root hole eliminating hole (71) which are correspondingly arranged;
the upper auxiliary slot hole group comprises five upper auxiliary slot holes (8);
the bottom plate slot group comprises eleven bottom plate slots (9);
the peripheral grove set comprises thirty-eight peripheral groves (10);
the inner ring slot hole group comprises twenty-two inner ring slot holes (11).
3. The method for blasting surrounding rock of class IV suitable for drilling of a three-armed rock drilling rig according to claim 2, characterized in that the distances of the three central underholing holes (1) from the tunnel face floor line (121) are respectively: 60cm, 140cm and 220 cm; the distances from the left central cutting hole (2) to the tunnel face floor line (121) and the distances from the right central cutting hole (21) to the tunnel face floor line (121) are respectively as follows: 60cm, 140cm and 220 cm; the distances from the seven left side cutting holes (3) and the seven right side cutting holes (31) to the tunnel face floor line (121) are respectively as follows: 40cm, 80cm, 120cm, 230cm, 270cm, 300cm, 330 cm; the distances from the four first left-side slot expanding holes and the four first right-side slot expanding holes to the tunnel face floor line (121) are respectively as follows: 60cm, 150cm, 230cm, 320 cm; the distances from the four second left-side slot expanding holes and the four second right-side slot expanding holes to the tunnel face floor line (121) are respectively as follows: 60cm, 150cm, 230cm, 320 cm; the distances from the three left groove side auxiliary eyes (6) and the three right groove side auxiliary eyes (61) to the tunnel face floor line (121) are respectively as follows: 60cm, 150cm, 230 cm; the distance between one left bottom root eliminating hole (7) and one right bottom root eliminating hole (71) and the floor line (121) of the tunnel face is respectively as follows: 60cm, and the distance between the adjacent upper auxiliary slotted holes (8) is 80 cm: the distance between the adjacent bottom plate slot holes (9) is 100 cm: the distance between adjacent peripheral grommets (10) is 50 cm: the distance between adjacent inner ring slots (11) is 70 cm.
4. The method of blasting grade IV surrounding rock suitable for drilling by a three-armed drill jumbo as claimed in claim 3, wherein the footage size is 4.5m, the distance from the tail end of the guide rail beam of the three-armed drill jumbo to the side wall of the side wall is 10cm, the distance from the face (12) of the rock is 65cm, and the opening positions of the drill bit at the front end of the guide rail beam are respectively at the following distances from the center line of the face (12): the distance between the bottom of the hole and the center line of the tunnel is respectively 25cm, 120cm, 220cm, 320cm, 430cm, 540cm, 620cm and 640cm, and the distance between the charging stand (13) and the tunnel face (12) is 55 cm.
5. The method of blasting grade IV surrounding rock suitable for drilling of a three-arm jumbo as claimed in claim 3, wherein the footage size is 4.0m, the distance from the tail end of the guide rail beam of the three-arm jumbo to the side wall of the side wall is 10cm, the distance from the face (12) is 65cm, the opening position of the drill bit at the front section of the guide rail beam is 100cm, 245cm, 300cm, 360cm, 420cm, 450cm, 540cm and 600cm from the center line of the face (12), the distance from the hole bottom to the center line of the tunnel is 25cm, 120cm, 220cm, 320cm, 430cm, 540cm, 620cm and 640cm, respectively, and the distance from the charge stand (13) to the face (12) is 55cm in step S2.
6. The method for blasting grade IV surrounding rock suitable for drilling by a three-arm drill jumbo according to any one of claims 4 and 5, wherein plastic detonating tube detonators are installed in the central slitting hole (1), the left central slitting hole (2), the left slitting hole (3), the first left side reaming hole (4), the second left side reaming hole (5), the left slot side auxiliary hole (6), the left undercut eliminating root hole (7), the right central slitting hole (21), the right slitting hole (31), the first right side reaming hole (41), the second right side reaming hole (51), the right slot side auxiliary hole (61), the right undercut eliminating root hole (71) group, the upper auxiliary slitting hole (8) and the bottom plate slitting hole (9) and are detonated by using electric detonators.
7. The method for blasting the IV-grade surrounding rocks applicable to the drilling of the three-armed rock drilling jumbo as claimed in claim 6, wherein an explosive binding detonating cord and a spaced charging structure are arranged in the peripheral slot (10).
8. The method for blasting grade IV surrounding rocks suitable for drilling by a three-arm rock drilling jumbo according to claim 7, characterized in that the central cutting hole (1), the left central cutting hole (2), the left cutting hole (3), the right central cutting hole (21) and the right cutting hole (31) adopt 1-section plastic detonator; the first left-side slot expanding hole (4) and the first right-side slot expanding hole (41) adopt 3 sections of plastic detonating tube detonators; the second right-side slot expanding hole (51) and the second left-side slot expanding hole (5) adopt 5-section plastic detonating tube detonators; the left side groove side auxiliary eye (6), right side groove side auxiliary eye (61) and upper bound auxiliary groove eye (8) adopt 7 sections of plastic detonating tube detonators, a left side disappear end root hole (7), a right side disappear end root hole (71) and inner circle groove eye (11) adopt 11 sections of plastic detonating tube detonators, peripheral groove eye (10) adopt 13 sections of plastic detonating tube detonators.
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