US20130319277A1 - Blasting Method Using a Control Device for Inducing a Blast Pressure, and Control Device for Inducing the Blast Pressure to Apply the Method - Google Patents

Blasting Method Using a Control Device for Inducing a Blast Pressure, and Control Device for Inducing the Blast Pressure to Apply the Method Download PDF

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Publication number
US20130319277A1
US20130319277A1 US14/000,503 US201214000503A US2013319277A1 US 20130319277 A1 US20130319277 A1 US 20130319277A1 US 201214000503 A US201214000503 A US 201214000503A US 2013319277 A1 US2013319277 A1 US 2013319277A1
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Prior art keywords
blast pressure
blast
explosive
control device
blocking
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Abandoned
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US14/000,503
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English (en)
Inventor
Geum Won Cho
Jong Eun Cho
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Korea Institute of Civil Engineering and Building Technology KICT
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Individual
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Publication of US20130319277A1 publication Critical patent/US20130319277A1/en
Assigned to KIM, YOUNG HO, KIM, KYEONG SUK, CHO, Geum Won, CHO, Jong Eun, CHO, EUN JEONG, KOREA INSTITUTE OF CONSTRUCTION TECHNOLOGY, KIM, CHANG YONG, KIM, KWANG YEOM reassignment KIM, YOUNG HO ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHO, Geum Won, CHO, Jong Eun
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D5/00—Safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D3/00—Particular applications of blasting techniques
    • F42D3/04—Particular applications of blasting techniques for rock blasting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
    • F42D1/22—Methods for holding or positioning for blasting cartridges or tamping cartridges

Definitions

  • the present invention relates to an innovative blasting technique wherein at the time of blasting operation of outermost holes of a tunnel or road surface and wall surface and the like of a site where adjacent structures are positioned in a city, a transmission path of the blast pressure can be controlled in such a way that the blast pressure does not exceed a predetermined blast line by means of a blast pressure-guiding control device, but is limitedly transmitted only to a blast area, whereby more smooth and fine-looking blast surface is obtained and also overbreak can be prevented and vibration and noise can be minimized.
  • construction work and engineering work are key industries of a nation, and the scale and number of the works are much increased with development of industry, and as a basic work for carrying out such construction work and engineering work, a blasting operation is one of operations which are most frequently done out in various construction sites (road construction, tunnel, a site where adjacent structures are positioned in a city and the like).
  • the blasting operation has a purpose of removing rocks, and a method for most simply removing the rocks generally consists in using of explosive.
  • the explosive has an advantage that it is easily available and can be conveniently used.
  • general blasting method is a method in which circular blast holes are drilled and then the explosive is loaded in the center of the hole to be blasted, wherein since uniform blast pressure is applied to the whole hole walls of the blast holes, there are problems that, especially in constructing of a tunnel, cross section of the tunnel is not smooth and is uneven, blast vibration and noise are severe and thus the blast pressure exceeds the predetermined blast line of the tunnel, therefore the tunnel is further excavated, which results in occurrence of overbreak.
  • controlling of the blast pressure is a very important key point.
  • a method for controlling the blast pressure there are proposed a method wherein position of free surface and interval between holes are properly adjusted, decoupling explosive loading method etc., however, these method have disadvantages that they cost a great deal and their control effects are not so high.
  • the decoupling explosive loading method is a blasting method wherein fine explosive is utilized which is most wide-spreadly much used, wherein crack is generated along the predetermined blast line by utilizing a phenomenon that range of destruction is decreased while impact effect of the explosive uniformly acting on the whole hole wall of the blast hole since air layer is formed between the explosive installed in the center of the blast hole and the hole wall of the blast hole.
  • the present invention has been devised to actively solve various problems involved in blasting method according to the prior art, and its object is to provide a blasting method and blast pressure-guiding control device wherein by loading the explosive in blast pressure-blocking covers which partially wrap only one side of the explosive along longitudinal direction thereof and thereafter inserting and installing the blast pressure-blocking covers in blast holes so as to face a predetermined blast line, transmission path of the blast pressure can be freely controlled in such a way that the blast pressure is not transmitted to the direction of the predetermined blast line by means of the blast pressure-blocking covers at the time of blasting operation, but is transmitted to a blast area, i.e., the other side of the predetermined blast line.
  • the present invention provides as means for achieving the above-mentioned object a blasting method comprising a step wherein the explosive is loaded in each of a plurality of blast pressure-blocking covers opened on one side thereof; a step wherein the blast pressure-blocking covers are longitudinally connected and assembled; a step wherein the plurality of connected and assembled blast pressure-blocking covers are inserted and installed in blast holes so as to face the predetermined blast line; a step wherein the tamping is charged in the blast holes; and a step wherein detonator leg line is integrally connected with blast mother line and thereafter the explosive is blasted.
  • the present invention provide a blast pressure-guiding control device wherein partially-opened blast pressure-guiding passage is formed on one side of the blast pressure-blocking cover of circular cross section, explosive-loading part is formed inside the blast pressure-guiding passage, and a second wall and third wall are successively and integrally formed on inner surface of the blast pressure-blocking cover, and cover-assembling means is provided which comprises a coupling projection protruding outwardly from the second wall on one longitudinal side thereof and a coupling groove formed recessed from the second wall on the other side thereof, whereby the blast pressure-blocking covers can be connected and assembled according to the number of the explosive.
  • the blast pressure-blocking covers partially wrapping only one side of the explosive are disposed in the blast holes so as to face the predetermined blast line, the blast pressure-blocking covers block transmission of the blast pressure to the predetermined blast line, thus the blast pressure cannot exceed the predetermined blast line at the time of blasting operation, but is limitedly transmitted only to a blast area, i.e., the inside of the predetermined blast line, whereby there are provided effects that blast surface is correctly formed along the predetermined blast line and the blast surface is more smooth and fine-looking, and overbreak can be effectively prevented and vibration and noise can be minimized, thus quality of construction work is drastically enhanced.
  • FIG. 1 is a longitudinal sectional view illustrating a state wherein a blast pressure-guiding control device according to an example of the present invention is installed in blast hole at the time of blasting operation of a tunnel.
  • FIG. 2 is a sectional view taken along line A-A of FIG. 1 of the present invention.
  • FIG. 3 is a front view of a blast pressure-blocking cover of the present invention.
  • FIG. 4 is an exploded perspective view of the blast pressure-blocking cover of present invention.
  • FIG. 5 is a top view illustrating a state wherein explosive is loaded in the blast pressure-blocking cover of present invention.
  • FIG. 6 is an enlarged sectional view illustrating a state wherein the blast pressure-blocking cover of present invention loaded with the explosive is installed in the blast hole.
  • FIG. 7 is an enlarged sectional view illustrating a state wherein the blast pressure-blocking covers of present invention are connected and assembled with each other.
  • FIG. 8 is a top view of a blast pressure-guiding control device according to another example of present invention.
  • FIG. 9 is a top view of a blast pressure-guiding control device according to yet another example of present invention.
  • FIG. 10 is a block diagram showing sequence of the blasting method according to the present invention.
  • the blasting method comprises explosive-loading step (S 10 ) wherein the explosive ( 1 ) is loaded in each of a plurality of blast pressure-blocking covers ( 110 ) formed with a blast pressure-guiding passage ( 11 ) therein and thereafter the explosive ( 1 ) is fixed by wrapping it with connecting bands ( 115 ); cover-assembling step (S 20 ) wherein the plurality of blast pressure-blocking covers ( 110 ) are longitudinally connected and assembled; cover-installing step (S 30 ) wherein the plurality of blast pressure-blocking covers ( 110 ) thus connected and assembled are inserted and installed in blast holes ( 2 ) so as to face a predetermined blast line ( 4 ); tamping-charging step (S 40 ) wherein the tamping ( 7 ) is charged in the blast holes ( 2 ); and detonator leg line-connecting and blasting step (S 50 ) wherein the detonator leg
  • the explosive ( 1 ) is loaded in each of the plurality of blast pressure-blocking covers ( 110 ) formed with the blast pressure-guiding passage ( 111 ) along its longitudinal direction on its one side.
  • the explosive ( 1 ) is pushed and loaded into an explosive-loading part ( 112 ) formed inside the blast pressure-blocking covers ( 110 ), as illustrated in FIG. 5 , and thereafter, the explosive ( 1 ) is firmly fixed by wrapping the explosive with the connecting bands ( 115 ) such that any play is not occurred.
  • the blast pressure-blocking cover ( 110 ) is formed with the blast pressure-guiding passage ( 111 ) open on one side of the cover, tension is ensured which allows both end portions of the blast pressure-blocking cover to freely play upward and downward from the blast pressure-guiding passage ( 111 ) in the plane of the drawing, as seen in FIG. 5 , whereby an effect is provided that various explosives ( 1 ) can be more smoothly loaded regardless of the size, form and type of the explosive ( 1 ).
  • the blast pressure-blocking cover ( 110 ) are formed having the same length as that of the explosive ( 1 )) and thus one explosive ( 1 ) is can be loaded in one blast pressure-blocking cover ( 110 ), and in accordance with the amount used of the explosive ( 1 ) the corresponding number of the blast pressure-blocking covers ( 110 ) is used.
  • a coupling projection ( 141 ) formed at one longitudinal side of the blast pressure-blocking cover ( 110 ) is fitted into a coupling groove ( 142 ) formed in another blast pressure-blocking cover ( 110 ), as seen in FIG. 7 , such that the plurality of blast pressure-blocking covers ( 110 ) with the explosive ( 1 ) loaded at ratio of 1:1 can remain integrated with each other, whereby the blast pressure-blocking covers ( 110 ) with the explosive ( 1 ) loaded can be successively and integrally connected.
  • the blast pressure-blocking covers ( 110 ) can remain integrated with each other and the explosives ( 1 ) can also remain in longitudinally and integrally connected state, even if blast is occurred by connecting the detonator to any one of the explosives ( 1 ), the explosives ( 1 ) can be wholly blasted together.
  • the plurality of the blast pressure-blocking covers ( 110 ) connected and assembled are inserted and installed in the blast hole ( 2 ) in the state of the detonator leg line ( 5 ) connected to one of the explosives ( 1 ) being exposed to the outside of the blast hole ( 2 ).
  • the blast pressure-blocking covers ( 110 ) should be necessarily inserted and installed in the blast holes ( 2 ) so as to face the predetermined blast line ( 4 ).
  • the blast pressure-blocking covers ( 110 ) by disposing the blast pressure-blocking covers ( 110 ) so as to face the predetermined blast line ( 4 ), the predetermined blast line ( 4 ) and the explosive ( 1 ) are kept apart from each other with the blast pressure-blocking cover ( 110 ) being present therebetween, whereby the blast pressure-blocking cover ( 110 ) prevent the blast pressure from exceeding the predetermined blast line ( 4 ) at the time of blasting operation, thereby forming smooth and fine-looking blast surface correctly along the predetermined blast line ( 4 ) and efficiently preventing the occurrence of overbreak and also reducing vibration and noise.
  • the detonator leg line ( 5 ) is exposed long to the outside while running along a gap ( 6 ) formed between inner surface of the blast pressure-blocking cover ( 110 ) and the explosive ( 1 ), whereby the detonator leg line ( 5 ) can be conveniently exposed to the outside of the blast hole ( 2 ) at the time of installing operation of the blast pressure-blocking covers ( 110 ).
  • the tamping ( 7 ) such as sand or clay etc. is charged in the blast hole ( 2 ) such that the explosive ( 1 ) can fully exhibit its power by means of sealing effect and at the same time noise and scattering can be prevented.
  • the detonator leg line ( 5 ) exposed from the blast hole ( 2 ) to the outside is electrically and integrally connected with the blast mother line.
  • the blast pressure-guiding control device ( 100 ) of the present invention comprises a plurality of blast pressure-blocking covers ( 110 ) formed with an explosive-loading part ( 112 ) inside the blast pressure-guiding passage ( 111 ) formed on one side of the cover, a second wall ( 120 ) and third wall ( 130 ) of curved surface form successively and integrally formed on inner side of the blast pressure-blocking covers ( 110 ); and a cover-assembling means ( 140 ) enabling the plurality of blast pressure-blocking covers ( 110 ) to be longitudinally and integrally connected and assembled with each other.
  • Such a blast pressure-blocking covers ( 110 ) are formed having the same length as that of conventional explosive ( 1 ) so as to load the explosive (I) at the ratio of 1:1, and is made in a circular form in cross section so as to wrap a part of the explosive ( 1 ), with the blast pressure-guiding passage ( 111 ) formed partially open on one side of the cover along the longitudinal direction thereof, and the explosive-loading part ( 112 ) for loading the explosive ( 1 ) is formed inside the blast pressure-guiding passage ( 111 ).
  • the plurality of buffering projections ( 113 ) are protrudingly and equidistantly formed on the outer circumferential surface of the blast pressure-blocking cover ( 110 ), and perform a buffering function when the blast pressure-blocking cover ( 110 ) is bumped against the hole wall of the blast hole ( 2 ), thereby further increasing an effect of blocking transmission of the blast pressure to the predetermined blast line ( 4 ).
  • the second wall ( 120 ) and third wall ( 130 ) of curved surface form are successively and integrally formed on inner side of the blast pressure-blocking cover ( 110 ), it is possible to doubly and triply block the transmission of the blast pressure to the predetermined blast line ( 4 ) and at the same to control transmission path of the blast pressure in such a way that the blast pressure is more concentratively transmitted to the direction of the blast pressure-guiding passage ( 111 ).
  • a plurality of buffering projections ( 123 ) and ( 133 ) are equidistantly formed on outer circumferential surfaces of the second wall ( 120 ) and third wall ( 130 ), as seen in FIG. 6 , to perform a buffering function at the time of blast, and air layers ( 125 ) and ( 135 ) are formed between the buffering projections ( 123 ) and between the buffering projections ( 133 ), respectively, whereby the air layers serve as airbag at the time of blasting operation to absorb shocks, thereby more efficiently blocking the transmission of the blast pressure to unwanted direction, i.e., the predetermined blast line ( 4 ).
  • the coupling projection ( 141 ) is protrudingly formed integrally with the second wall ( 120 ) on one longitudinal side thereof, extending outwardly therefrom, and the coupling groove ( 142 ) is formed recessed inwardly from the second wall ( 120 ) on the other side thereof, whereby it is possible to quickly, conveniently and selectively connect and assemble several blast pressure-blocking covers ( 110 ) for its use according to the amount used of the explosive ( 1 ) by fitting the coupling projection ( 141 ) into the coupling groove ( 142 ) of the another blast pressure-blocking cover ( 110 ).
  • a lock ( 144 ) with a inclined surface ( 143 ) is additionally and protrudingly formed on a tip of inner surface of the coupling projection ( 141 ).
  • the lock ( 144 ) is fittedly coupled with a locking hole ( 145 ) formed through the third wall ( 130 ) while being connected with the coupling groove ( 142 ), thereby setting a locking, whereby it is possible to keep firmer and integrated connection and assembly state.
  • one end portion of the connecting band ( 115 ) for fixing the explosive ( 1 ) by wrapping the same is integrally fixed on one side of the outer circumferential surface of the blast pressure-blocking cover ( 110 ), and adhesive is applied on the other end portion of the connecting band ( 115 ), and an release paper ( 116 ) is attached on a surface on which the adhesive is applied.
  • the explosive ( 1 ) can be kept in integrated firm loaded state without being separated from the blast pressure-blocking cover ( 110 ).
  • the plurality of blast pressure-blocking covers ( 110 ) are longitudinally connected and assembled, however, there is no need to firstly perform loading operation of the explosive ( 1 ) and subsequently perform assembling operation of the blast pressure-blocking covers ( 110 ), so sequence of the operations may be changed, therefore, the only change of the sequence does not depart from the scope of the present invention.
  • blast pressure-blocking covers ( 110 ) when inserting and installing the plurality of connected and assembled, blast pressure-blocking covers ( 110 ) in the blast holes ( 2 ), the blast pressure-blocking covers ( 110 ) should be inserted and installed so as to face the predetermined blast line ( 4 ) as seen in FIG. 6 .
  • the blast pressure-blocking covers ( 110 ) perform a role of blocking the blast pressure so as not to be transmitted to the predetermined blast line ( 4 ) at the time of blasting of the explosive ( 1 ), thus not only can very smooth blast surface be obtained but overbreak can be effectively prevented as well, whereby there are provided effects that quality of construction work is drastically enhanced and vibration and noise can be minimized.
  • Such a blast pressure-guiding control device ( 100 a ) may be carried out with a different embodiment as shown in FIG. 8 , wherein the construction of the blast pressure-blocking cover ( 110 ) is identical to that of the previous embodiment, but it is characterized in that the blast pressure-blocking cover ( 110 ) is made with such a long length that several explosives (I) can be loaded in the cover at once, not at the ratio of 1:1, and therefore the cover-assembling means ( 140 ) of the previous embodiment is omitted, and the third wall ( 130 ) of the previous embodiment is omitted, the only second wall ( 120 ) of curved surface form alone is formed integrally with the blast pressure-blocking cover ( 110 ) on the inside thereof, the plurality of buffering projections ( 123 ) are equidistantly and protrudingly formed on the outer circumferential surface of the second wall ( 120 ), and the air layers ( 125 ) are formed between the buffering projections ( 123 ).
  • a blast pressure-guiding control device ( 100 b ) of the present invention may be also carried out with another different embodiment as shown in FIG. 9 , wherein the device has very simplified structure wherein the second wall ( 120 ), third wall ( 130 ) and also cover-assembling means ( 140 ) of the first embodiment are omitted.
  • blast pressure-blocking cover ( 110 ) is identical to that of the first embodiment, but is made with such a long length that several explosives (I) can be loaded in the cover at once, not at the ratio of 1:1.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
US14/000,503 2011-02-21 2012-02-17 Blasting Method Using a Control Device for Inducing a Blast Pressure, and Control Device for Inducing the Blast Pressure to Apply the Method Abandoned US20130319277A1 (en)

Applications Claiming Priority (3)

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KR1020110014967A KR101054707B1 (ko) 2011-02-21 2011-02-21 폭압유도 제어장치를 이용한 발파공법 및 이 공법에 적용되는 폭압유도 제어장치
KR10-2011-0014967 2011-02-21
PCT/KR2012/001218 WO2012115397A2 (ko) 2011-02-21 2012-02-17 폭압유도 제어장치를 이용한 발파공법 및 이 공법에 적용되는 폭압유도 제어장치

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JP (2) JP5079915B2 (ko)
KR (1) KR101054707B1 (ko)
WO (1) WO2012115397A2 (ko)

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CN110953944A (zh) * 2019-11-21 2020-04-03 中交隧道工程局有限公司 一种特长隧道平导直眼掏槽逐孔起爆快速掘进的方法
CN112302661A (zh) * 2020-09-17 2021-02-02 浙江钱塘江水利建筑工程有限公司 长距离小断面隧道施工工艺
CN114322686A (zh) * 2021-12-31 2022-04-12 北京住总集团有限责任公司 一种暗挖隧道安全爆破的起爆网路架构及控制方法
WO2023002421A1 (en) * 2021-07-21 2023-01-26 Koekemoer Louis Christiaan Blast hole device

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KR101153825B1 (ko) 2011-07-26 2012-06-18 조금원 폭압유도 및 제어를 위한 조립식 장약홀더
KR101174762B1 (ko) 2012-06-05 2012-08-17 조금원 폭압 전달 방향 제어를 위한 고효율 조립식 장약홀더
KR101358398B1 (ko) 2012-12-24 2014-02-05 전남대학교산학협력단 폭약튜브용 측벽가이더 및 조절발파를 위한 이의 시공방법
KR101307374B1 (ko) * 2013-04-26 2013-10-16 대한민국 폭발물용 방폭 튜브
CN108643924B (zh) * 2018-05-03 2019-09-13 安徽理工大学 一种高应力围岩巷道的卸压方法
CN110207557B (zh) * 2019-06-20 2024-02-27 保利民爆哈密有限公司 一种矿岩控制爆破飞石的防护网罩
CN110360905A (zh) * 2019-07-23 2019-10-22 贵州久远爆破工程有限责任公司 一种露天深孔爆破降尘装置
KR102119864B1 (ko) * 2019-10-08 2020-06-09 최찬규 방진 주름캡을 이용한 폭약 발파 장치 및 이를 포함하는 폭발력 집중과 진동소음교란 발파 방법
CN118189766B (zh) * 2024-02-22 2024-09-06 湖南西部民爆工程有限公司 一种隧道爆破作业连接阻断结构

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US4297946A (en) * 1978-12-05 1981-11-03 Paton Boris E Extended shaped charge and method of making same
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110953944A (zh) * 2019-11-21 2020-04-03 中交隧道工程局有限公司 一种特长隧道平导直眼掏槽逐孔起爆快速掘进的方法
CN112302661A (zh) * 2020-09-17 2021-02-02 浙江钱塘江水利建筑工程有限公司 长距离小断面隧道施工工艺
WO2023002421A1 (en) * 2021-07-21 2023-01-26 Koekemoer Louis Christiaan Blast hole device
CN114322686A (zh) * 2021-12-31 2022-04-12 北京住总集团有限责任公司 一种暗挖隧道安全爆破的起爆网路架构及控制方法

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JP5335120B2 (ja) 2013-11-06
KR101054707B1 (ko) 2011-08-05
JP2012172967A (ja) 2012-09-10
JP5079915B2 (ja) 2012-11-21
WO2012115397A2 (ko) 2012-08-30
JP2012211760A (ja) 2012-11-01
WO2012115397A3 (ko) 2012-12-20

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