CN203785563U - Dual-sleeve energy accumulation shaped charge blasting device - Google Patents

Dual-sleeve energy accumulation shaped charge blasting device Download PDF

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Publication number
CN203785563U
CN203785563U CN201420033688.9U CN201420033688U CN203785563U CN 203785563 U CN203785563 U CN 203785563U CN 201420033688 U CN201420033688 U CN 201420033688U CN 203785563 U CN203785563 U CN 203785563U
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China
Prior art keywords
tube
pipe
cutting
sleeve
blasting
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Expired - Fee Related
Application number
CN201420033688.9U
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Chinese (zh)
Inventor
程玉泉
白著
王铁法
黄雄飞
宁艳玲
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CCCC First Highway Xiamen Engineering Co Ltd
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CCCC First Highway Xiamen Engineering Co Ltd
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Priority to CN201420033688.9U priority Critical patent/CN203785563U/en
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Publication of CN203785563U publication Critical patent/CN203785563U/en
Expired - Fee Related legal-status Critical Current
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Abstract

The utility model discloses a dual-sleeve energy accumulation shaped charge blasting device, which comprises an outer sleeve and an inner joint cutting pipe, wherein a sealing device is arranged on one end of the outer sleeve; the inner joint cutting pipe is arranged at the eccentric position of the outer sleeve, and a cutting joint is arranged in the inner joint cutting pipe; an explosive fills the inner joint cutting pipe, and a detonating cord is provided; water fills the space between the outer wall of the inner joint cutting pipe and the inner wall of the outer sleeve. The dual-sleeve energy accumulation shaped charge blasting device is suitable for construction of smooth blasting engineering of a tunnel, which utilizes an emulsion explosive, and construction of smooth blasting engineering or presplitting blasting, which prevents overbreak under all kinds of surrounding rock conditions.

Description

A kind of pair of sleeve pipe CUMULATIVE BLASTING device that saves up strength
Technical field
The utility model relates to a kind of demolition set, is specifically related to a kind of pair of sleeve pipe CUMULATIVE BLASTING device that saves up strength.
Background technology
In recent years, development plan according to national five national trunk highways running from north to south and seven running from west to east, China's highway, high-speed rail construction enter fast-developing period, at Hilly land Tunnel Engineering number, increase gradually, photoface exploision engineering construction difficulty in tunnel strengthens gradually, various wall rock condition photoface exploisions are backbreak and are brought huge first two lining concrete amount increase to cause construction cost sharply to increase, safety requirements uprises, explosive cost is soaring, tunnel photoface exploision engineering construction adopts not coupling charging technology of conventional hoop conventionally, and this construction method exists the problem of the following aspects:
1, explosive use amount is large, and a common big gun hole is used to such an extent that dose is bigger than normal by design except stemming length;
2, the phenomenon of backbreaking is serious, according to field measurement statistics, because explosion (being that radix calculates by the first two lining design thickness) major part that occurs backbreaking concentrates on: III level country rock 20%-50%, area 2-6m backbreaks 2, IV level country rock 40%-70%, area 4-8m backbreaks 2, V level country rock 60%-90%, area 6-10m backbreaks 2, even larger;
3, explosive energy utilization rate is low, and because conventional photoface exploision all utilizes the detonation stresses ripple of explosive charge generation and the effect fragmented rock body of detonation gas, energy loss is large, and capacity usage ratio is low;
4, country rock explosion damage is large, and safe mass assurance coefficient is low, and line charge constitution does not mate with lithology.Adopt that coupling charging medicine footpath and aperture ratio are not excessive, to country rock, cause hoop to destroy understanding not enough, cause too much explosive energy to act on reservation country rock, cause big gun orifice ring to strengthen to destroying, to country rock, disturbance also strengthens, and explosion damage causes wall rock loosening ring unstability to form slump;
5, the measure of country rock buffer protection is not in place.At light blast hole, do not take retaining wall measure, light blast hole inner side does not arrange the corresponding minimizing explosive payload of cushion hole, causes and backbreaks;
6, be unfavorable for energy-conserving and environment-protective, because using explosive charge large, Property of Blasting Noise is large, blasting dust is large, and to site operation, personnel bring health hazard.
Utility model content
The purpose of this utility model is the above deficiency for background technology, provide that a kind of construction period is shorter, explosive use amount is lower, explosive energy utilization rate is high, smooth demolition effect good, effective control over-excavation, safe mass is guaranteed, work efficiency is high, two sleeve pipes of energy-conserving and environment-protective save up strength CUMULATIVE BLASTING device.
The technical solution of the utility model is as follows:
Pair sleeve pipe CUMULATIVE BLASTING device that saves up strength, is characterized in that, comprising:
One outer tube, one end of this outer tube is provided with a sealing device;
One inscribe slit-tube, described inscribe slit-tube is located at the eccentric position of outer tube, and this inscribe pipe cutting is provided with joint-cutting; In inscribe slit-tube, be filled with explosive, and be provided with primacord;
Between the outer wall of interior Pipe Cutting and outer sleeve inner wall, fill water.
In a preferred embodiment, between outer tube and interior Pipe Cutting, be provided with positioner.
In a preferred embodiment, described positioner is: interior Pipe Cutting is provided with locating slot, and outer tube relevant position is provided with locating hole, in locating slot and locating hole, is provided with latch.
In a preferred embodiment, joint-cutting has 4, is axially symmetrically distributed in the both sides of pipe.
In a preferred embodiment, inscribe slit-tube is thickness 1-2mm's pvc pipe, outer tube is pvc pipe.
In a preferred embodiment, width of slit 2-3mm, slot length 50-110cm, interval 10cm, head 10cm.
In a preferred embodiment, use straight tube is cut into semi-ring is close to joint-cutting pipe one side with pvc pipe glue, is equidistantly uniformly distributed 4 as eccentric location, and semi-ring spacer side afterbody is cut a locating slot.
The main explosion mechanism of the utility model device and effect
(1) inscribe slit-tube: according to the cumulative principle that saves up strength, take pvc pipe as constraint medium, explosion moment, joint-cutting pipe changes the uniform confined explosive blasting energy of hoop situation, the joint-cutting pipe of smooth homogeneous carries out directional guide cumulative to blasting energy, blasting energy is preferentially discharged at joint-cutting place, form high speed high energy energy-gathering jetting, drive water body formation in pipe to shoot high stream mode " water wedge, water cutter ", along joint-cutting direction, rock mass is carried out to cumulative cutting, the destruction of fracture area tapers off to a point, produce guiding crackle, Incoercibility because of water, keep enough stress can maintain crackle with desirable orientation expansion, the Crack Extension of other directions is suppressed relatively, the effect that reduction destroys country rock disturbance, played the effect of buffering retaining wall,
(2) outer tube: convenient construction, the effect of joint-cutting pipe eccentricity orientation, the water receptacle effect of water coupling;
(3) bottom is strengthened powder charge and is overcome hole bed rock stone clamping action, and bore portions stemming contributes to extend blasting energy action time in hole, increases useful energy, reduces harmful energy effect;
(4) install whole water coupling retaining wall and CUMULATIVE BLASTING jet double action: inscribe slit-tube explosive charge moment, there is the inscribe slit-tube smooth inner wall of certain compression strength to the of short duration constraint of blasting energy, reflection, buffering, make inscribe slit-tube tube wall play first and cut off the direct effect of blasting energy to country rock, at inscribe slit-tube cumulative simultaneously, the detonation wave energy of reflecting part does not see through the whole energy that passes of smooth inscribe slit-tube, towards the interior water body uniform ring of pipe to extruding, utilize the Incoercibility of water again to pass energy, arrive outer sleeve inner wall, reduced overall outer tube moves to retaining wall direction, suffer the counter-force that hole wall and outer tube transmit, force energy direction again to transform, to the further evenly constraint of cumulative water body, reflection, buffering, reverse cumulative, two protection casings and water form moment " the half-moon-shaped water cushion of two dividing plates ", the plastic deformation of pvc pipe and the acting in conjunction of semilune water body, the energy that acts on retaining wall direction is decayed again, can effectively intercept detonation gas directly wedges in the primary and secondary interstice of hole wall extruding and destroys hole wall rock mass.
Pertinent literature is pointed out: the theoretical analysis can obtain the initial impact pressure peak of outgoing-line type CUMULATIVE BLASTING energy on hole wall and reduce by 17.59%; Because of the existence of protection casing, can significantly reduce the percussion of explosion product to retaining wall direction, between smooth wall protection explosion free face and retaining wall face, shearing difference is up to 3.5 times, and between joint-cutting position critical surface and retaining wall face, shearing difference is up to 1.75 times; The strain value of retaining wall face direction ratio free face is all little, and individual layer protection casing side retaining wall face rock mass is 43.97% than critical surface strain of rock mass reduced rate, and double-deck protection casing side retaining wall face rock mass is 38.32% one 86.93% than the strain reduced rate of critical surface rock mass.Add after protection casing, the active force that produces blasting energy after explosion is the strongest at joint-cutting place, and free face direction is taken second place, and retaining wall face direction is minimum.
Explosion is initial, because blasting energy preferentially discharges at joint-cutting place, forms high speed high energy energy-gathering jetting, breaks through the outer tube of joint-cutting direction, and to the cutting of rock mass cumulative, fracture area tapers off to a point; Explosion mid-term, the accumulation of energy cumulative action of " the half-moon-shaped water cushion of two dividing plates " water body retarded wave, the high-speed energy-storage water body that outer tube ring-direction reflection is returned forms moment squash type high speed water jet flow between inside and outside sleeve pipe, under high speed water jet flow explosive charge energy-gathering jetting in joint-cutting pipe drives, form " water cutter, water wedge ", " high speed water cutter " cuts the most advanced and sophisticated fracture area of the aforementioned rock mass of joint-cutting direction again, and the water body of hysteresis pulsating wave forms " the water wedge " of of short duration stable hydraulic pressure; Explosion latter stage, the detonation gas vaporization water body of HTHP is pvc pipe even, and along quick-fried raw crack diffusion, the balance that detonation gas is new has reduced the pressure and temperature peak value that forming gas causes hole wall, the explosion of dissolving retaining wall direction scar damages, strengthening retaining wall and cumulative double action; More quick-fried than conventional light to guarantee, even than conventional cumulative light is quick-fried, obtain better smooth demolition effect, contribute to the object of utilizing hydraulic pressure demolition principle to add forcing crushing free face rock and deepen cyclic advance simultaneously.Be conducive to eliminate rock bank, greatly improve blast hole utilizing factor, can save approximately 30% dose than common not coupling charging, and because of the infiltration of water, effectively prevent rock burst, atomized water is caught simultaneously and is inhaled blasting fume and the mine dust that blast causes, " energy storage, the cumulative, turn can " of realizing that energy rationally utilizes, reaches the object that solves a Smooth Blasting at Changle Tunnel technological package difficult problem.
Seen from the above description, the compound energy-gathering device Smooth Blasting at Changle Tunnel method that saves up strength of the eccentric water coupling joint-cutting of the two sleeve pipes of the utility model, has the advantages such as the construction period is short, explosive use amount is low, explosive energy utilization rate is higher, cost is lower, safe mass is guaranteed, smooth demolition effect is good, work efficiency is high, energy-conserving and environment-protective, the economical rationality of construction input.The utility model also has the following advantages:
(1) use for the first time the compound energy-gathering device Smooth Blasting at Changle Tunnel that saves up strength of the eccentric water coupling joint-cutting of two sleeve pipes, the advantage of the Incoercibility of performance water, increases the useful energy of explosion, reduces blasting energy harmful energy, rationally effectively improves explosive charge capacity usage ratio;
(2) improve in a large number smooth demolition effect, the quick-fried face of conventional light mostly is to be torn rock mass and reaches the quick-fried object of light, and two new technologies but be take splitting and reached the quick-fried object of light as feature, and integral body is backbreak and diminished, and country rock disturbance is little.
(3) configure the energy-gathering device that saves up strength and make deep hole explosive easy to operation, reduce explosive charge, improve efficiency of construction;
(4) change the state of having nothing to do before explosion personnel blast working, rationally utilize workman's redundancy time, by the reach of operation preparation, reduce the site operation working time;
(4) easily association's making of device, conveniently makes in batch, can streamlined factory formula make; Convenient transportation, conveniently grow up tunnel and various wall rock condition Smooth Blasting Construction;
(5) can use at various geological conditions Smooth Blasting at Changle Tunnels the big gun hole that also can apply to use various presplit blastings, the engineering construction of particularly suitable tunnel blasting.
Accompanying drawing explanation
Fig. 1 is the utility model inscribe slit-tube structural representation;
Fig. 2 is the utility model outer sleeve structure schematic diagram;
Fig. 3 is the two sleeve pipe charge constitution schematic diagrames of the utility model;
Fig. 4 is wherein a kind of blast hole loading structure schematic diagram of the utility model.
Does is Fig. 5 that the utility model device cross section schematic diagram (be can't see semi-ring spacer 13 on Fig. 5?).
Fig. 6 is the omnipotent curved surface finder of the utility model plan structure schematic diagram;
Fig. 7 is the structural representation of another angle of the omnipotent curved surface finder of the utility model;
Fig. 8 is the utility model light blast hole horizontal layout schematic diagram.
The specific embodiment
Referring to Fig. 1 to Fig. 8
The utility model comprises
Inscribe slit-tube 1: structure is referring to Fig. 1 and Fig. 5.Select certain flexibility, anti-flammability, antistatic, constraint strength is moderate, reasonable cost performance, economic pvc pipe, according to rock Protodyakonov coefficient and joint fissure degree, design linear charging density.Joint-cutting pipe keep its structure and hardness itself most important to the appropriate design of the constraint cumulative ability of blasting energy and Slit shape of mold.According to engineering practice, select thickness 1-2mm's pipe, its overall structure is more even, and better to the effect of blasting energy constraint directional guide, joint-cutting can reach bilateral cumulative energy dissection again.
Inscribe slit-tube adopts the carrying jig positioning sliding type workbench slip cutting processing of cutting machine repacking.Be provided with altogether 4 joint-cuttings 11, the design of bi-directional symmetrical interval, every joint-cutting distributes vertically, width 2-3mm, length 50-110cm, interval 10cm, pvc pipe head 10cm, afterbody 20cm be joint-cutting not.And afterbody is provided with a locating slot 12.
Use in advance straight tube is cut into semi-ring, with pvc pipe glue, is close to joint-cutting pipe one side, and semi-ring spacer 13 side afterbodys are cut a locating slot as eccentric location to be equidistantly uniformly distributed 4, guarantees the eccentric free face A of joint-cutting pipe side.Because face might not be regular, and consider aperture obstruction, full length of tube is than the short 40-80cm of periphery hole design hole depth, and end is cut an osculum and done joint-cutting hand designations, convenient making and construction assembling and positioning.
Outer tube 2
Big gun hole B diameter , outer tube 2 external diameters should be less than big gun hole 4-10mm's pipe, facilitates powder charge construction, can meet assembly precision requirement.Its Main Function is flexible retaining wall material, location, water storage, its length should be less than periphery hole projected depth 30-60cm, at afterbody and inscribe slit-tube locating slot 11 matched position centre drill one apertures 21, with bamboo throwaway chopsticks as alignment pin, to meet joint-cutting pipe positioning requirements.Its afterbody is provided with locating slot 22.At head, be provided with pipe and cover 23.
(3) device plug for seal Machining
A. adopt pipe covers 23 use drainpipe glue bonds and exists in outer tube, dry, guarantee to have certain adhesion strength and water-tight.Fresh water pouring in outer tube;
B. the primacord 3(that packs prior well cutting appropriate length at inscribe slit-tube 1 is than the long 50cm of blast hole depth);
C. will emulsion cuts into 4 strip powder sticks along diametric(al) cross, be placed on the wide film of long 20cm of 1m, be rolled into the small diameter medicine roll of length 80cm, powder stick is sandwiched to joint-cutting 11, utilize joint-cutting to form section of jurisdiction, both sides by emulsion and primacord 3 compactings, and with the fixing joint-cutting pipe powder charge position of wide adhesive tape;
D. at the bottom of outer tube, increase 30-50g emulsion reinforcement powder charge, inscribe slit-tube 1 is slowly inserted to the outer tube 2 of filling with water, note locating slot and position of positioning hole, insert throwaway chopsticks, guarantee that inscribe slit-tube is seated location, cuts disconnected along aperture;
E. outer aperture section is filled in plastic sheeting group in advance, cuts off water and emulsion, breaks one deck foamed glue 5, with plastic sheeting group, fills in and beats one deck silica gel sealing 9 again, guarantees water-tight being advisable.
2) the compound energy-gathering device blast working flow process that saves up strength of the eccentric water coupling joint-cutting of two sleeve pipes:
(1) energy-gathering device that saves up strength is transported to behind blast working scene, handles with care, with breakage-proof.
(2) according to blast working design, during powder charge, note allowing device joint-cutting pipe side be close to free face, available universal curved surface locator 6(is referring to Fig. 6-8 if desired, in figure, 61 is that draw ring, 62 is that steel wire rope, 63 is locating ring, 7 is outline line) correct joint-cutting direction, guarantee that bilateral joint-cutting on line is parallel with contoured surface, then push gently and allow position at the bottom of device arrival hole;
(3) can pack in position, aperture 1-2 water-saving bag into, stemming 8 tamping of 20-30cm length stopped up in aperture;
(4) blasting circuit connects, checks, finally detonates.
Above are only a specific embodiment of the present utility model, but design concept of the present utility model is not limited to this, allly utilizes this design to carry out the change of unsubstantiality to the utility model, all should belong to the behavior of invading the utility model protection domain.

Claims (8)

1. two sleeve pipes CUMULATIVE BLASTING device that saves up strength, is characterized in that, comprising:
One outer tube, one end of this outer tube is provided with a sealing device;
One inscribe slit-tube, described inscribe slit-tube is located at the eccentric position of outer tube, and this inscribe pipe cutting is provided with joint-cutting; In pipe, be filled with explosive, and be provided with primacord;
Between the outer wall of interior Pipe Cutting and outer sleeve inner wall, fill water.
2. a kind of pair of sleeve pipe as claimed in claim 1 CUMULATIVE BLASTING device that saves up strength, is characterized in that, between outer tube and interior Pipe Cutting, is provided with positioner.
3. a kind of pair of sleeve pipe as claimed in claim 2 CUMULATIVE BLASTING device that saves up strength, is characterized in that, described positioner is: interior Pipe Cutting is provided with locating slot, and outer tube relevant position is provided with locating hole, in locating slot and locating hole, is provided with latch.
4. the CUMULATIVE BLASTING device that saves up strength of a kind of pair of sleeve pipe as described in claim 1-3 any one, is characterized in that, joint-cutting has 4, is axially symmetrically distributed in the both sides of pipe.
5. a kind of pair of sleeve pipe as claimed in claim 4 CUMULATIVE BLASTING device that saves up strength, is characterized in that, inscribe slit-tube is thickness 1-2mm's pvc pipe, outer tube is pvc pipe.
6. a kind of pair of sleeve pipe as claimed in claim 5 CUMULATIVE BLASTING device that saves up strength, is characterized in that width of slit 2-3mm, slot length 50-110cm, interval 10cm, head 10cm.
7. a kind of pair of sleeve pipe as claimed in claim 4 CUMULATIVE BLASTING device that saves up strength, is characterized in that, uses straight tube is cut into semi-ring spacer, with pvc pipe glue, is close to inscribe slit-tube one side, is equidistantly uniformly distributed 4 as eccentric location, and semi-ring spacer side afterbody is cut a locating slot.
8. a kind of pair of sleeve pipe as claimed in claim 4 CUMULATIVE BLASTING device that saves up strength, is characterized in that, in outer tube, explosive is filled in bottom, bubble mud is filled in open top.
CN201420033688.9U 2014-01-20 2014-01-20 Dual-sleeve energy accumulation shaped charge blasting device Expired - Fee Related CN203785563U (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104614260A (en) * 2015-01-27 2015-05-13 中国矿业大学(北京) Method and system for obtaining detonation gas pressure effect data
CN106091853A (en) * 2016-06-20 2016-11-09 何广沂 Tunnel piercing cumulative smooth Hydraulic Blasting device and blasting method
CN106907960A (en) * 2017-04-17 2017-06-30 安徽理工大学 A kind of one side notched blasting powder column housing
CN106930723A (en) * 2017-02-15 2017-07-07 扬州大泽石油工程技术有限公司 Cumulative binding type is nested leak stopping solid wall device and its application in solution cavity leak stopping
CN107014263A (en) * 2017-04-18 2017-08-04 中国矿业大学(北京) The eccentric powder charge joint-cutting pipe and roadway construction method constructed applied to tunnelling
CN108680070A (en) * 2018-06-13 2018-10-19 绍兴文理学院 A kind of aqueous medium two-way-inlet duct device and its application method
CN109164139A (en) * 2018-08-13 2019-01-08 中国石油大学(北京) Metal slot pipe explosive forming experimental provision and experimental method
CN109764781A (en) * 2019-03-14 2019-05-17 中交隧道工程局有限公司 One kind is asymmetric not to couple fining charge sleeve device
CN109764782A (en) * 2019-03-14 2019-05-17 中交隧道工程局有限公司 A kind of fine blasting technique of smooth surface based on pre-powder charge
CN109916243A (en) * 2019-03-29 2019-06-21 雅化集团攀枝花鑫祥化工有限公司 A kind of presplitting device and method
CN111023929A (en) * 2019-12-16 2020-04-17 余天哲 Carbon dioxide gas rock cracking rod hole entering equipment
CN113154977A (en) * 2021-05-21 2021-07-23 核工业南京建设集团有限公司 Bidirectional symmetrical kerf charging structure and method for smooth blasting

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104614260A (en) * 2015-01-27 2015-05-13 中国矿业大学(北京) Method and system for obtaining detonation gas pressure effect data
CN104614260B (en) * 2015-01-27 2017-07-28 中国矿业大学(北京) A kind of method and system for obtaining detonation gas pressure action effect data
CN106091853A (en) * 2016-06-20 2016-11-09 何广沂 Tunnel piercing cumulative smooth Hydraulic Blasting device and blasting method
CN106930723A (en) * 2017-02-15 2017-07-07 扬州大泽石油工程技术有限公司 Cumulative binding type is nested leak stopping solid wall device and its application in solution cavity leak stopping
CN106930723B (en) * 2017-02-15 2019-01-18 中国石油大学(北京) Wall device and its application in solution cavity leak stopping are consolidated in the leak stopping of nesting of cumulative binding type
CN106907960A (en) * 2017-04-17 2017-06-30 安徽理工大学 A kind of one side notched blasting powder column housing
CN106907960B (en) * 2017-04-17 2019-02-12 安徽理工大学 A kind of single side notched blasting powder column shell
CN107014263A (en) * 2017-04-18 2017-08-04 中国矿业大学(北京) The eccentric powder charge joint-cutting pipe and roadway construction method constructed applied to tunnelling
CN107014263B (en) * 2017-04-18 2019-02-19 中国矿业大学(北京) Eccentric powder charge joint-cutting pipe and roadway construction method applied to tunnelling construction
CN108680070A (en) * 2018-06-13 2018-10-19 绍兴文理学院 A kind of aqueous medium two-way-inlet duct device and its application method
CN108680070B (en) * 2018-06-13 2020-01-31 绍兴文理学院 aqueous medium bidirectional energy-gathering blasting device
CN109164139A (en) * 2018-08-13 2019-01-08 中国石油大学(北京) Metal slot pipe explosive forming experimental provision and experimental method
CN109164139B (en) * 2018-08-13 2020-07-03 中国石油大学(北京) Metal slotted pipe explosion forming experimental device and experimental method
CN109764781A (en) * 2019-03-14 2019-05-17 中交隧道工程局有限公司 One kind is asymmetric not to couple fining charge sleeve device
CN109764782A (en) * 2019-03-14 2019-05-17 中交隧道工程局有限公司 A kind of fine blasting technique of smooth surface based on pre-powder charge
CN109764782B (en) * 2019-03-14 2021-03-02 中交隧道工程局有限公司 Smooth surface fine blasting method based on pre-charging
CN109764781B (en) * 2019-03-14 2021-03-23 中交隧道工程局有限公司 Asymmetric uncoupled fine charging sleeve device
CN109916243A (en) * 2019-03-29 2019-06-21 雅化集团攀枝花鑫祥化工有限公司 A kind of presplitting device and method
CN109916243B (en) * 2019-03-29 2021-11-23 雅化集团攀枝花鑫祥化工有限公司 Pre-splitting device and method
CN111023929A (en) * 2019-12-16 2020-04-17 余天哲 Carbon dioxide gas rock cracking rod hole entering equipment
CN113154977A (en) * 2021-05-21 2021-07-23 核工业南京建设集团有限公司 Bidirectional symmetrical kerf charging structure and method for smooth blasting

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Granted publication date: 20140820

Termination date: 20180120