CN217465549U - Tunnel blast hole structure based on directional energy-gathering slotted hole - Google Patents
Tunnel blast hole structure based on directional energy-gathering slotted hole Download PDFInfo
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- CN217465549U CN217465549U CN202221466511.9U CN202221466511U CN217465549U CN 217465549 U CN217465549 U CN 217465549U CN 202221466511 U CN202221466511 U CN 202221466511U CN 217465549 U CN217465549 U CN 217465549U
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 40
- 238000009412 basement excavation Methods 0.000 claims abstract description 13
- 238000009792 diffusion process Methods 0.000 claims description 2
- 238000005422 blasting Methods 0.000 abstract description 51
- 239000002360 explosive Substances 0.000 abstract description 25
- 239000011435 rock Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 13
- 230000006378 damage Effects 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 20
- 230000008569 process Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 6
- 238000005553 drilling Methods 0.000 description 5
- 239000012141 concentrate Substances 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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Abstract
The utility model belongs to the technical field of the tunnel construction, in particular to tunnel blast hole structure based on directional energy-gathering slotted hole, this structure is including being arranged in tunnel face lower part the undercutting district with be arranged in tunnel face excavation profile edge, and encircle the peripheral big gun hole district of undercutting district, undercutting district central line both sides are provided with vertical range respectively, and a row of symmetry each other undercut directional energy-gathering slotted hole, peripheral big gun hole district is by taking the undercutting district to spread outward as the center, and the peripheral directional energy-gathering slotted hole of one deck that the circularity was arranged, peripheral big gun hole district and undercutting still laid between the district a plurality of supplementary directional energy-gathering slotted holes. The utility model discloses a directional energy gathering is carved the slotted hole and is concentrated energy along the notch cut department, and the preferential fracture of notch cut direction can increase blast hole interval, reduces blasting quantity and explosive unit consumption, and the notch cut hole plays certain guide effect simultaneously, has alleviateed the destruction of explosive stress ripples and explosive gas to the country rock, can reduce the country rock damage, forms smooth level and smooth wall.
Description
Technical Field
The utility model belongs to the technical field of the tunnel construction, in particular to tunnel blast hole structure based on directional energy gathering slotted hole carving.
Background
The directional fracture control blasting technology is widely applied to underground cavern construction, and mainly comprises a blast hole slot cutting (carving) blasting method, an energy-gathered cartridge blasting method, a kerf cartridge blasting method and the like. The cutting (carving) groove blasting refers to that a groove with a certain depth is cut on the axial hole wall of a blast hole according to the blasting cracking direction and design requirements, then explosive charging blasting is carried out, and accordingly directional fracture of a rock body is achieved by means of the explosive stress concentration effect. The energy-gathered cartridge blasting method is characterized in that an oriented fracture surface is formed by utilizing the energy gathering effect of an energy gathering groove and the penetration effect of jet flow after a cartridge is exploded, a common energy-gathered cartridge is simple and reliable, but the cartridge is required to be accurately placed in a blast hole, and a rectangular cartridge and a high-medium cartridge are complex to process, high in technical requirement and difficult to popularize in industrial application. The joint-cutting explosive blasting method is to make use of the hard tube after axial grooving to charge explosive in the tube, so that the explosive gas is focused towards the joint-cutting direction, and the joint-cutting explosive blasting method has the functions of directional fracture and surrounding rock protection.
In summary, various conventional directional fracture blasting measures are applied in tunneling, certain economic benefits are generated, the existing directional fracture control blasting technology is mostly used in a peripheral hole blasting structure, energy-collecting cartridge blasting is mainly used, energy-collecting pipes or energy-collecting cartridges need to be machined in advance on site, construction procedures and cost are increased, and for areas with strict management of initiating explosive devices, site-machined cartridges often have no conditions and products need to be customized in factories. China patent 'directional fracture blasting tunnel portal device and construction and use method thereof' (CN 201811517108.2) sets a circle of directional fracture holes adopting energy-gathered explosive bags on the contour line of a tunnel, thereby reducing the explosive quantity and energy-gathered blasting and reducing the blasting vibration influence on surrounding rocks. Chinese patent "a low damage directional energy-gathering dado blasting method" (CN 201310453811.2) provides a blasting method of energy-gathering peripheral holes and energy-gathering explosive bags by adopting water pressure grooving, but only the peripheral holes are grooved, and energy-gathering grooved holes are arranged in a targeted manner without aiming at the blasting mechanism of slotted holes and auxiliary holes.
Disclosure of Invention
To the above problem, the utility model aims at providing a tunnel blast hole structure based on directional energy-gathering groove hole of carving, can carve the groove hole through directional energy-gathering and concentrate the energy along the notch groove department, the preferential fracture of notch groove direction can increase blast hole interval, reduces blasting quantity and explosive unit consumption, and the notch groove hole plays certain guide effect simultaneously, has alleviateed the destruction of explosive stress ripples and explosive gas to the country rock, can reduce the country rock damage, forms smooth level and smooth wall.
The technical scheme of the utility model lies in: the utility model provides a tunnel blast hole structure based on directional energy-gathering slotted hole, includes the undermining area that is arranged in tunnel face lower part and is located tunnel face excavation profile edge, and encircles undermining area's peripheral big gun hole region, undermining area uses the vertical central line of tunnel face as the central line, undermining area central line both sides are provided with vertical range respectively and a mutual symmetry one row undermining directional energy-gathering slotted hole, peripheral big gun hole region by with undermining area is outside diffusion, and the annular one deck peripheral directional energy-gathering slotted hole of arranging as the center, peripheral big gun hole region with undermining still has laid a plurality of supplementary directional energy-gathering slotted holes between the district.
The periphery directional energy-gathering slotted hole is provided with a periphery directional energy-gathering slotted hole upper notch groove and a periphery directional energy-gathering slotted hole lower notch groove from top to bottom, and the periphery directional energy-gathering slotted hole upper notch groove and the periphery directional energy-gathering slotted hole lower notch groove are tangent to the excavation contour line direction of the tunnel face respectively.
The upper notch groove of the peripheral directional energy-gathering notch hole and the lower notch groove of the peripheral directional energy-gathering notch hole are rectangular slot grooves, the width range of the rectangular slot grooves is 0.3-0.4 mm, the length range of the rectangular slot grooves is 2-4 cm, and the distance between the centers of blast holes of the adjacent peripheral directional energy-gathering notch holes ranges from 45cm to 80 cm.
The cut directional energy-gathering slotted hole is provided with a cut directional energy-gathering slotted hole upper notch and a cut directional energy-gathering slotted hole lower notch from top to bottom, and the cut directional energy-gathering slotted hole upper notch and the cut directional energy-gathering slotted hole lower notch are parallel to the center line of the tunnel face respectively.
The upper notch of the cut directional energy-gathering notch hole and the lower notch of the cut directional energy-gathering notch hole are rectangular slots, the width range of the rectangular slots is 0.3-0.4 mm, the length range of the rectangular slots is 2-4 cm, and the central distance of blast holes adjacent to the cut directional energy-gathering notch hole ranges from 50cm to 90 cm.
The auxiliary directional energy-gathering slotted hole is provided with an auxiliary directional energy-gathering slotted hole upper notch, an auxiliary directional energy-gathering slotted hole middle notch and an auxiliary directional energy-gathering slotted hole lower notch from top to bottom respectively, the auxiliary directional energy-gathering slotted hole upper notch and the auxiliary directional energy-gathering slotted hole lower notch are tangent to the excavation contour line direction of the tunnel face respectively, and the notch in the auxiliary directional energy-gathering slotted hole is arranged between the auxiliary directional energy-gathering slotted hole upper notch and the auxiliary directional energy-gathering slotted hole lower notch and close to the center line of the tunnel face.
The grooving direction of the grooving in the auxiliary directional energy-gathering grooving hole is perpendicular to a connecting line of the grooving directions of the grooving on the auxiliary directional energy-gathering grooving hole and the grooving below the auxiliary directional energy-gathering grooving hole, and the connecting line is in a T shape.
The upper notch of the auxiliary directional energy-gathering notch hole, the middle notch of the auxiliary directional energy-gathering notch hole and the lower notch of the auxiliary directional energy-gathering notch hole are all rectangular slots, the width range of the rectangular slots is 0.3-0.4 mm, and the length range of the rectangular slots is 2-4 cm.
The technical effects of the utility model reside in that: 1. the utility model discloses a directional energy accumulation cut groove hole concentrates the energy along cut groove department, and the cut groove direction is preferred to be cracked, can increase blast hole interval, reduces blasting quantity and explosive unit consumption, has overcome the shortcoming that traditional blasting drilling blasting energy can not be concentrated, has improved the blasting energy accumulation effect, and the cut groove hole plays certain guide effect simultaneously, has alleviateed the destruction of explosive stress ripples and explosive gas to the country rock, can reduce the country rock damage, forms smooth level wall; 2. the utility model discloses a simple process, convenient operation, safe and reliable, the directional dado blasting method that gathers of low damage that controllability is good, according to blasting mechanism and the big gun hole distribution of tunnel blasting all around hole, auxiliary hole and cut hole, through adopting different grooving forms and gathering the energy direction, only need pack into conventional cartridge bag, just can realize gathering the effect of energy blasting.
The following will be further described with reference to the accompanying drawings.
Drawings
Fig. 1 is the embodiment of the utility model provides a blast hole arrangement schematic diagram of tunnel blast hole structure based on directional energy-gathered slotted hole.
Fig. 2 is a schematic diagram of the notch distribution of the tunnel blast hole structure based on the directional energy-gathered notch hole of the present invention.
Fig. 3 is a schematic structural view of the peripheral directional energy-gathering slotted hole of the embodiment of the present invention.
Fig. 4 is a schematic structural view of an auxiliary directional energy-gathering slotted hole according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of a cut oriented energy-gathering notch hole of the embodiment of the present invention.
Reference numerals: 1-peripheral directional energy-gathering notch hole, 2-auxiliary directional energy-gathering notch hole, 3-cut directional energy-gathering notch hole, 11-peripheral directional energy-gathering notch hole lower notch groove, 12-peripheral directional energy-gathering notch hole upper notch groove, 21-auxiliary directional energy-gathering notch hole lower notch groove, 22-auxiliary directional energy-gathering notch hole upper notch groove, 23-auxiliary directional energy-gathering notch hole middle notch groove, 31-cut directional energy-gathering notch hole lower notch groove, and 32-cut directional energy-gathering notch hole upper notch groove.
Detailed Description
Example 1
As shown in fig. 1 and 2, a tunnel blast hole structure based on directional energy-gathered slotted hole comprises an undermining area positioned at the middle lower part of a tunnel face and a peripheral hole area positioned at the edge of an excavation profile of the tunnel face and surrounding the undermining area, wherein the undermining area uses the vertical central line of the tunnel face as a central line, a row of undermining directional energy-gathered slotted holes 3 which are vertically arranged and mutually symmetrical are respectively arranged on two sides of the central line of the undermining area, the peripheral hole area is a layer of peripheral directional energy-gathered slotted holes 1 which are outwards diffused by taking the undermining area as the center and annularly arranged, and a plurality of auxiliary directional energy-gathered slotted holes 2 are further arranged between the peripheral hole area and the slotted area.
In the in-service use process, the utility model relates to a tunnel blast hole structure based on directional energy-gathering groove hole of carving, directional energy-gathering groove hole 3 of carving through the undercutting, peripheral directional energy-gathering groove hole 1 of carving, supplementary directional energy-gathering groove hole 2 of carving sets up, different directional energy-gathering groove hole of carving concentrates the energy along the notch, the preferential fracture of notch orientation, can increase blast hole interval, reduce blasting quantity and explosive unit consumption, overcome the shortcoming that traditional blasting drilling blasting energy can not concentrate, improved the blasting and gathered the energy effect, the notch plays certain guide effect simultaneously, the destruction of blast stress wave and explosive gas to the country rock has been alleviateed, the damage of country rock can be reduced, form smooth level and smooth wall.
Example 2
Preferably, on the basis of embodiment 1, in this embodiment, as shown in fig. 3, the peripheral directional energy-gathering slotted hole 1 is provided with a peripheral directional energy-gathering slotted hole upper slotted hole 12 and a peripheral directional energy-gathering slotted hole lower slotted hole 11 from top to bottom, and the peripheral directional energy-gathering slotted hole upper slotted hole 12 and the peripheral directional energy-gathering slotted hole lower slotted hole 11 are respectively tangent to the excavation contour line direction of the tunnel face.
In the in-service use process, peripheral directional energy gathering carves slotted hole 1 along excavation outline line direction both sides grooving, be "a style of calligraphy" and arrange, utilize the stress concentration of grooving department that excavation outline line direction was arranged when the blasting, realize the directional fracture between the adjacent hole, form smooth light and explode the face, reduced the stress disturbance to peripheral country rock moreover.
Example 3
Preferably, on the basis of embodiment 2, in this embodiment, both the upper notch 12 of the peripheral directional energy-gathering notch hole and the lower notch 11 of the peripheral directional energy-gathering notch hole are rectangular slots, the width range of the rectangular slots is 0.3-0.4 mm, the length range is 2-4 cm, and the central distance between blast holes of adjacent peripheral directional energy-gathering notch holes 1 ranges from 45cm to 80 cm.
In the use, the utility model discloses state peripheral directional energy and can carve 12, peripheral directional energy and carve slot 11 and be the rectangle slot on the slot hole under the slot hole, the width scope in rectangle slot is 0.3 ~ 0.4mm, and length range is 2 ~ 4cm, can adopt the primary pore-forming technology of special drilling tool, also can adopt the technology of the slot again after the pore-forming, and the rectangle slot forms stress concentration in slot department when the big gun hole blasting, realizes the directional fracture of blasting.
Example 4
Preferably, on the basis of embodiment 1 or embodiment 2, in this embodiment, as shown in fig. 4, the cut-oriented energy-gathering slotted hole 3 is provided with a cut-oriented energy-gathering slotted hole upper notch 32 and a cut-oriented energy-gathering slotted hole lower notch 31 from top to bottom, and the cut-oriented energy-gathering slotted hole upper notch 32 and the cut-oriented energy-gathering slotted hole lower notch 31 are parallel to the central line of the tunnel face respectively.
In the in-service use process, the undercutting orientation gather cut hole 3 along adjacent cut hole central line direction grooving, the stress concentration of cut department between the cut hole when utilizing the blasting realizes gathering of adjacent cut hole can the blasting, improves and gathers the energy blasting effect, increases the cut hole interval, reduces cut hole quantity.
Example 5
Preferably, on the basis of embodiment 4, in this embodiment, both the upper notch 32 of the cut oriented energy-gathering notch hole and the lower notch 31 of the cut oriented energy-gathering notch hole are rectangular slots, the width range of the rectangular slots is 0.3-0.4 mm, the length range is 2-4 cm, and the central distance between blast holes of adjacent cut oriented energy-gathering notch holes 3 ranges from 50cm to 90 cm.
In the in-service use process, the directional engrave groove that gathers in the undercutting hole 32, the directional engrave groove 31 that gathers in the undercutting hole of undercutting are the rectangle slot, the width scope in rectangle slot is 0.3 ~ 0.4mm, and the length scope is 2 ~ 4cm, can adopt special drilling tool pore-forming technology once, and the process of undercutting again after also can adopting the pore-forming compares current cylindrical undermining hole, the utility model discloses a directional engrave groove that gathers in the undercutting, rectangle slot form stress concentration in slot department when the big gun hole blasting, realize the directional fracture of blasting.
Example 6
Preferably, on the basis of embodiment 1 or embodiment 4, in this embodiment, as shown in fig. 5, the auxiliary directional energy-gathering notch hole 2 is provided with an auxiliary directional energy-gathering notch hole upper notch 22, an auxiliary directional energy-gathering notch hole middle notch 23, and an auxiliary directional energy-gathering notch hole lower notch 21 from top to bottom, the auxiliary directional energy-gathering notch hole upper notch 22 and the auxiliary directional energy-gathering notch hole lower notch 21 are respectively tangent to the excavation contour line direction of the tunnel face, and the auxiliary directional energy-gathering notch hole middle notch 23 is arranged between the auxiliary directional energy-gathering notch hole upper notch 22 and the auxiliary directional energy-gathering notch hole lower notch 21 and is close to the central line of the tunnel face.
In the actual use process, the upper notch 22 of the auxiliary directional energy-gathering notch hole and the lower notch 21 of the auxiliary directional energy-gathering notch hole are respectively tangent to the excavation contour line direction of the tunnel face, and the notches can be formed along two sides of the center line of adjacent holes of the same initiation section, so that energy-gathering blasting between the adjacent auxiliary holes is realized.
Example 7
Preferably, on the basis of embodiment 6, in this embodiment, the notch direction of the notch 23 in the auxiliary directional energy-gathering notch hole is perpendicular to the connecting line of the notch directions of the upper notch 22 and the lower notch 21 of the auxiliary directional energy-gathering notch hole, and is in a shape of "T".
In the in-service use, supplementary directional ability slotted hole adopt "T style of calligraphy" trilateral slotted hole mode of carving, wherein follow the adjacent hole central line both sides slotted of same priming section, realize gathering between the adjacent auxiliary hole and can blow to the notch in the direction of perpendicular adjacent auxiliary hole center line, gather to facing the sky face when realizing blasting and can the fracture, realize gathering of auxiliary hole and can blow.
Example 8
Preferably, on the basis of embodiment 6, in this embodiment, the upper notch 22 of the auxiliary directional energy-gathering notch hole, the middle notch 23 of the auxiliary directional energy-gathering notch hole, and the lower notch 21 of the auxiliary directional energy-gathering notch hole are all rectangular slots, the width range of the rectangular slot is 0.3-0.4 mm, and the length range is 2-4 cm.
In the in-service use process, supplementary directional energy can be carved slotted hole on the slotted hole 22, supplementary directional energy can be carved slotted hole in 23, supplementary directional energy can be carved slotted hole under the slotted hole 21 be the rectangle slot, the width scope in rectangle slot is 0.3 ~ 0.4mm, and length scope is 2 ~ 4cm, can adopt special drilling tool pore-forming technology once, also can adopt the technology of the slotted hole again after the pore-forming, compares current cylindrical supplementary directional hole, the utility model discloses a supplementary directional energy can be carved the slotted hole, and the rectangle slot forms stress concentration in slot department when the big gun hole blasting, realizes the directional fracture of blasting.
The utility model discloses use directional energy gathering groove carving hole in the tunnel blasting tunnelling, can fully rationally utilize the blasting direction and the mechanism that different blasting excavated holes, through big gun hole grooving, realize that the directional energy gathering of all ring edge holes, auxiliary hole and undermining hole can the blasting, improve blasting effect, the peripheral country rock of better protection. After the detonation, the reinforced energy-gathered jet flow is formed in the blast hole grooving direction and acts on the slot position earlier, the explosive stress wave firstly acts on the tip of the slot to cause stress concentration and cracking, then under the action of explosive gas, the crack is continuously cracked along the slot direction until the adjacent blast hole is penetrated, meanwhile, the existence of the slit cutting pipe plays a certain buffering role and a certain guiding role, the damage of the explosive stress wave and the explosive gas to the surrounding rock is reduced, and the purpose of forming a smooth and flat wall surface is achieved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (8)
1. The utility model provides a tunnel blast hole structure based on directional energy gathering slotted hole, its characterized in that: including being located tunnel face well lower part cut the district and be located tunnel face excavation profile edge, just encircle the peripheral big gun hole district of cut the district, cut the vertical central line that the district used tunnel face as the central line in the district, cut a district central line both sides and be provided with vertical range respectively and a row of cut the directional energy of mutual symmetry and gather slotted hole (3), peripheral big gun hole district by with cut the district as the center outwards diffusion, and the peripheral directional energy of one deck that the circularity was arranged and gather slotted hole (1), peripheral big gun hole district with cut still laid a plurality of supplementary directional energy of gathering between the district and cut slotted hole (2).
2. The tunnel blast hole structure based on directional energy-gathering slotted holes as claimed in claim 1, characterized in that: the periphery directional energy-gathering slotted hole (1) is provided with a periphery directional energy-gathering slotted hole upper slotted hole (12) and a periphery directional energy-gathering slotted hole lower slotted hole (11) from top to bottom, and the periphery directional energy-gathering slotted hole upper slotted hole (12) and the periphery directional energy-gathering slotted hole lower slotted hole (11) are tangent to the excavation contour line direction of the tunnel face respectively.
3. The tunnel blast hole structure based on directional energy-gathering slotted holes as claimed in claim 2, characterized in that: the upper notch groove (12) of the peripheral directional energy-gathering notch hole and the lower notch groove (11) of the peripheral directional energy-gathering notch hole are rectangular slot grooves, the width range of the rectangular slot grooves is 0.3-0.4 mm, the length range of the rectangular slot grooves is 2-4 cm, and the distance between the centers of blast holes of the adjacent peripheral directional energy-gathering notch holes (1) ranges from 45cm to 80 cm.
4. The tunnel blast hole structure based on directional energy-gathering slotted holes as claimed in claim 1, characterized in that: the cut directional energy-gathering slotted hole (3) is provided with a cut directional energy-gathering slotted hole upper slotted hole (32) and a cut directional energy-gathering slotted hole lower slotted hole (31) from top to bottom, and the cut directional energy-gathering slotted hole upper slotted hole (32) and the cut directional energy-gathering slotted hole lower slotted hole (31) are parallel to the central line of the tunnel face respectively.
5. The tunnel blast hole structure based on directional energy-gathering slotted holes as claimed in claim 4, wherein: the upper notch (32) and the lower notch (31) of the cut directional energy-gathering notch hole are rectangular slots, the width range of the rectangular slots is 0.3-0.4 mm, the length range of the rectangular slots is 2-4 cm, and the central distance of blast holes of adjacent cut directional energy-gathering notch holes (3) ranges from 50cm to 90 cm.
6. The tunnel blast hole structure based on directional energy-gathering slotted holes as claimed in claim 1, characterized in that: the auxiliary directional energy-gathering slotted hole (2) is provided with an auxiliary directional energy-gathering slotted hole upper notch groove (22), an auxiliary directional energy-gathering slotted hole middle notch groove (23) and an auxiliary directional energy-gathering slotted hole lower notch groove (21) from top to bottom respectively, the auxiliary directional energy-gathering slotted hole upper notch groove (22) and the auxiliary directional energy-gathering slotted hole lower notch groove (21) are tangent to the excavation contour line direction of the tunnel face respectively, and the auxiliary directional energy-gathering slotted hole middle notch groove (23) is arranged between the auxiliary directional energy-gathering slotted hole upper notch groove (22) and the auxiliary directional energy-gathering slotted hole lower notch groove (21) and close to the center line of the tunnel face.
7. The tunnel blast hole structure based on directional energy-gathering slotted holes as claimed in claim 6, wherein: the grooving direction of the grooving (23) in the auxiliary directional energy-gathering grooving hole is vertical to the connecting line of the grooving directions of the upper grooving (22) of the auxiliary directional energy-gathering grooving hole and the lower grooving (21) of the auxiliary directional energy-gathering grooving hole, and the auxiliary directional energy-gathering grooving hole is in a T shape.
8. The tunnel blast hole structure based on directional energy-gathering slotted holes as claimed in claim 6, characterized in that: the upper notch groove (22) of the auxiliary directional energy-gathering notch hole, the middle notch groove (23) of the auxiliary directional energy-gathering notch hole and the lower notch groove (21) of the auxiliary directional energy-gathering notch hole are rectangular slot grooves, the width range of the rectangular slot grooves is 0.3-0.4 mm, and the length range of the rectangular slot grooves is 2-4 cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221466511.9U CN217465549U (en) | 2022-06-13 | 2022-06-13 | Tunnel blast hole structure based on directional energy-gathering slotted hole |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221466511.9U CN217465549U (en) | 2022-06-13 | 2022-06-13 | Tunnel blast hole structure based on directional energy-gathering slotted hole |
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| CN217465549U true CN217465549U (en) | 2022-09-20 |
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| CN202221466511.9U Withdrawn - After Issue CN217465549U (en) | 2022-06-13 | 2022-06-13 | Tunnel blast hole structure based on directional energy-gathering slotted hole |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114963904A (en) * | 2022-06-13 | 2022-08-30 | 中交第二公路工程局有限公司 | Tunnel blast hole structure based on directional energy-gathering slotted hole and blasting method |
-
2022
- 2022-06-13 CN CN202221466511.9U patent/CN217465549U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114963904A (en) * | 2022-06-13 | 2022-08-30 | 中交第二公路工程局有限公司 | Tunnel blast hole structure based on directional energy-gathering slotted hole and blasting method |
| CN114963904B (en) * | 2022-06-13 | 2023-12-15 | 中交第二公路工程局有限公司 | Tunnel blasting hole structure based on directional energy-gathering slotted holes and blasting method |
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