GB2099117A - Stemming shot holes - Google Patents
Stemming shot holes Download PDFInfo
- Publication number
- GB2099117A GB2099117A GB8213273A GB8213273A GB2099117A GB 2099117 A GB2099117 A GB 2099117A GB 8213273 A GB8213273 A GB 8213273A GB 8213273 A GB8213273 A GB 8213273A GB 2099117 A GB2099117 A GB 2099117A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stemming
- ampoule
- water
- composition
- paste
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003708 ampul Substances 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000000203 mixture Substances 0.000 claims abstract description 55
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000008187 granular material Substances 0.000 claims abstract description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 8
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 6
- 229910021538 borax Inorganic materials 0.000 claims description 5
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000004328 sodium tetraborate Substances 0.000 claims description 5
- 239000002360 explosive Substances 0.000 claims description 4
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
- 239000000499 gel Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000005065 mining Methods 0.000 description 4
- 239000002202 Polyethylene glycol Substances 0.000 description 3
- 229920001223 polyethylene glycol Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- OMDQUFIYNPYJFM-XKDAHURESA-N (2r,3r,4s,5r,6s)-2-(hydroxymethyl)-6-[[(2r,3s,4r,5s,6r)-4,5,6-trihydroxy-3-[(2s,3s,4s,5s,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]methoxy]oxane-3,4,5-triol Chemical compound O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@@H]1OC[C@@H]1[C@@H](O[C@H]2[C@H]([C@@H](O)[C@H](O)[C@@H](CO)O2)O)[C@H](O)[C@H](O)[C@H](O)O1 OMDQUFIYNPYJFM-XKDAHURESA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229920000926 Galactomannan Polymers 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- 206010061307 Neck deformity Diseases 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- CDMADVZSLOHIFP-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane;decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 CDMADVZSLOHIFP-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 239000003349 gelling agent Substances 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- F42D1/24—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor characterised by the tamping material
- F42D1/28—Tamping with gelling agents
-
- 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
- F42D1/20—Tamping cartridges, i.e. cartridges containing tamping material
Landscapes
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Medical Preparation Storing Or Oral Administration Devices (AREA)
Abstract
A method of stemming shot holes, in which the transport of water is largely eliminated whilst preserving effective standards of tamping, involves the use of a stemming ampoule containing a gel-forming stemming composition and having a sealable filling aperture (5), the ampoule being filled with water outside the shot hole, the final paste stemming material being produced before the ampoule is introduced into the shot hole. The composition may be present as tablets, granules or flakes, and may be present as a reservoir attached to the inside wall of the ampoule. A tear-off strip may be provided and removed to permit the paste to exude.
Description
SPECIFICATION
Method and ampoule for tamping shot holes with paste stemming
This invention relates to a method of stemming shot holes in which an explosive charge in a shot hole is stemmed by inserting in the shot hole one or more stemming ampoules containing a watercontaining paste or gel and a stemming ampoule for carrying out the method.
The invention relates particularly to shot stemming as applicable in underground blasting and more particularly in coal mining where conditions require special precautions to suppress respirable dusts and to prevent firedamp and coal dust explosions. Unlike clay stemming, water stemming has the advantage that the material itself obviates the aforesaid hazards. However, water can escape from water stemming cartridges if these are even slightly damaged.
Because the empty cartridge has no stemming action, serious difficulties can arise. These difficulties can be avoided by using a paste or gelatinous stemming because the paste properties, notably the viscid nature of the material, cause it to adhere around the stemming cartridge so that the explosive charge cannot become exposed.
Suitable pastes however contain a substantial amount of water to ensure effective stemming, as well as gelling agents which should be without harmful effect particularly on health. Suitable materials are for example carboxymethylcellulose optionally used with certain activators or bentonite and alkalis.
It is known to fill shot holes underground by means of a pump with paste prepared above ground. However this procedure is disadvantageous for a number of reasons. Flrstly, it is unreliable because it is difficult to verify that the paste has reached the charge and that the charge has been properly stemmed in accordance with regulations. Secondly, a relatively large quantity of paste is required which is undesirable for economic reasons. Furthermore, the need to transport the water component of the paste underground is a particularly negative aspect.
In a further known alternative method paste, in an amount required for one shot hole, is filled into one or more stemming ampoules and the ampouies which are made of polyvinyl chloride or polyethylene, are introduced into the hole after they have been cut at their tips or perforated by some other means. The ampoules are in particular tubular ampoules formed of a flexible plastics film.
The aforesaid ampoules can be relied upon to produce the desired stemming effect because the paste, or at least that portion of the paste expressed from the ampoule, is released into the shot hole where it comes into intimate contact with surface irregularities and/or penetrates any cracks in the shot hole.
The aforesaid paste stemming cartridges have to be made above ground mainly because for economic reasons the mixing and filling of the tamping materials normally requires plant and equipment which is only justified by a high volume of production not normally required at individual mining sites. This necessitates the distribution of filled ampoules from a manufacturing centre to the individual mining sites thus incurring high transport and storage costs because of the weight and volume of the ampoules. Because the paste can contain up to 90% water, considerable amounts of stemming have to be transported over long distances, making this procedure economically unattractive, because of the water transportation aspect.
Moreover, water of suitable quality is generally available in sufficient quantity directly underground.
In the case of water stemming it is already known (from German Patent Specification No 1 066 929) to use preformed water stemming ampoules having sealed smooth tips and to fill these with pressurised water underground and outside the shot hole, the seal the ampoules and to use said ampoules to tamp shot holes. In the case of paste that is suitable for use as stemming, its properties and the difficult conditions underground however mean that the paste cannot be filled underground into empty cartridges or ampoules.
It is the aim of the invention to obtain economic shot stemming with paste which largely eliminates transportation of water whilst preserving effective standards of tamping.
According to the present invention there is provided a method of stemming shot holes comprising tamping the explosive charge in a shot hole with a water-containing paste stemming material by placing in the shot hole at least one stemming ampoule containing the water-admixed paste, characterised in that the stemming ampoule containing a stemming composition and having a sealable filling aperture is filled with water and outside the shot hole, the final stemming material being produced from the water and the stemming composition inside the sealed ampoule before the ampoule is introduced into the shot hole.
The cartridge or ampoules can be filled with water above ground at the mining site or be delivered underground ready filled with the stemming composition which means that proper filling therewith above ground can be assured.
Underground, only water remains to be added, this presenting no problems because conventional methods can be used. The work involved in producing the stemming ampoule is therefore reduced to mixing or dissolving the stemming composition in water. This can take place automatically inside the sealed ampoule or can be assisted in various ways for example by simply shaking the water-filled ampoule.
To minimise the transportation of water the stemming composition can comprise a substantially water-free dry material which forms a homogeneous gel or paste within the ampoule after filling with water.
The stemming composition can be loosely contained within the ampoule but particularly when the water filling aperture is of the type which is closed by a stopper it can be advantageous for the stemming composition to be located in a reservoir within the ampoule. This minimises the risk of any stemming composition being lost before the ampoule is filled with water.
The reservoir may be such that it can be opened to release the stemming composition or the reservoir can be formed from a material which is soluble in water and is automatically dissolved by the water filling.
According to another aspect of the invention there is provided a stemming ampoule comprising a tube of plastics material having a sealable filling aperture or a self-sealing valve through which the tube can be filled with water, the tube containing a quantity of a stemming composition sufficient to form a gel with the water filling.
The stemming composition can comprise one or more tablets which will dissolve in the water filling to produce a homogeneous paste filling having sufficient strength. Alternatively the stemming composition can be in granular or flake form.
Preferably the stemming composition combines with water to form a homogeneous stemming material with only a minimum of mixing being necessary eg by simply shaking the filled ampoule for a short time. To minimise the time between filling the ampoule with water and the ampoule being ready for use the stemming composition should preferably form a paste-like stemming material and be ready for use within a few minutes of the addition of the water filling.
A suitable stemming composition is a mixture of polyvinyl alcohol and sodium tetraborate.
The particle size of the gel-forming constituents, eg polyvinyl alcohol, affects speed of gel formation: coarser grains gel more slowly. For rapid gel formation a particle size of less than about 200 microns is preferred. In conjunction witfrthis material the preferred borate is sodium tetraborate having a particle size of 400 to 700 microns.
The amount of stemming composition contained within the ampoule is preferably such that afterfilling with water the polyvinyl alcohol concentration is in the range 2.5 to 20.5% by weight and the sodium tetraborate in the range of 1 to 8.5% by weight, ie about 25% to 50% of the amount of polyvinyl alcohol. The particles can be coated with polyethylene glycol to an amount of 6% and possibly 10% to 20% of the weight of polyvinyl alcohol to minimise lump formation.
Other suitable compositions to be contained within the ampoule are mixtures of a borate salt and a borate sensitive galactomannan gum such as guar gum.
The ampoule can be provided with a tear-off strip which has been removed after the stemming material has been formed in the ampoule to form a slit through which the stemming material exudes
when the ampoule is subjected to external pressure.
The paste should be of sufficient strength so that
when the tear-off strip is removed the paste
remains in the ampoule but is caused to exude
when subjected to the pressure by a stemming
rod after the ampoule has been inserted in a shot
hole. After being exuded in this wav the paste
should remain in position for a sufficient period of
time, about 1 hour is normally sufficient, in order to
be effective at the time of blasting.
To minimise the formation of lumps in the
stemming material it is conveniently arranged
that the stemming composition combines with
the added water as rapidly as possible after filling.
This can be assisted by arranging the stemming
composition along the length of the ampoule and
one method of achieving this is to enclose the
stemming composition in a reservoir of water
soluble material. The reservoir can extend
lengthwise of the ampoule and be secured to the
inside wall of the ampoule. Alternatively when the stemming composition is in particulate or flake
form the composition may be secured in a
distributed manner lengthwise of the ampoule. A
means for securing the stemming composition in
such a manner is a liquid surfactant coating
applied to the inside of the ampoule and to which the composition adheres.
The formation of lumps can also be minimised
when the stemming composition is particulate by
providing the particles with a water
dispersible/water-soluble coating. This enables the particles to be evenly dispersed within the water filling before they hydrate.
The invention will now be described with
reference to the accompanying drawings in which
Figure 1 is a first embodiment of an ampoule shown in partial longitudinal section;
Figure 2 is a view similar to Figure 1 showing a second embodiment of a paste stemming ampoule;
Figure 3 is a section on line Ill-Ill of Figure 2; and
Figures 4 and 5 are elevation and plan views of a reservoir for containing stemming composition in an ampoule.
All the embodiments of the invention use a conventional water stemming cartridge or ampoule
1 performed to the dimensions of the shot hole. In the examples shown in the drawings, a blown plastics film with a rounded or conical tip 2 is used. This ampoule body is formed of for example polyethylene or PVC. At the end opposite the tip 2 the ampoule has shoulder 3 and a short neck 4 enclosing a filling aperture 5 for water. The filling aperture 5 is closable by means of a stopper 6 provided with a radial bead 7 which co-operates with a radial groove 8 in the neck 4 to form a pressure-tight closure.
The invention is also applicable to other known types of ampoule not illustrated herein, particularly ampoules formed from flat film sealed at one end and provided at the opposite end with a self-sealing lipped valve through which water may be introduced but through which it cannot escape.
In Figure 1 the ampoule 1 contains two tablets 9 and 10 incorporating the substantially waterfree dry stemming composition. The ampoule, which with the exception of the two tablets 9 and 10 is empty, is delivered above ground. Figure 1 shows the ampoule after it has been filled with water to the lever 13. The paste is produced inside the ampoule from the water filling and the stemming composition incorporated in tablets 9 and 10.
The paste can be produced by allowing the tablet to degrade in the water and form a gel.
In the embodiment of the invention as shown in Figure 2, a film tube 15 sealed at the top 12 and bottom 14 is attached to the inside wall 11 for example by welding it to the wall of the ampoule 1. Film tube 15 forms a reservoir containing the dry stemming composition in the form of a powder 16 which has the property of forming a paste stemming material with water.
The reservoir is formed of a material which is easily soluble in water for example a gelatin, so that when water is introduced, the reservoir 15 releases the stemming composition and gelling takes place.
As shown in Figures 4 and 5 the particulate stemming composition can be contained in a film tube 1 7 which is sealed at both ends 18 and 19 to give the appearance of a cushion. Sealing produces a higher internal pressure which facilitates the release of powder and filling with water.
Instead of tablets 9 and 10 dry stemming composition can also be used in the form of flakes or rods or any similar shapes whose passage through the filling aperture 5 when stopper 6 is not in place is relatively difficult.
A paste having the properties required for a stemming material can be produced inside the ampoule from the stemming composition and the water filling. The strength of the paste stemming material can be established in advance eg by measuring with an "instron" penetrometer and the strength can be adjusted by varying the amount of stemming composition contained within the ampoule.
To prevent lumping, the paste stemming material is produced in the ampoule as rapidly as possible. This can be achieved by arranging the stemming composition along the length of the ampoule. Particularly useful in this respect are those of the illustrated embodiments in which the stemming composition is contained in a dissoluble reservoir. However, when the stemming compozition is in granulate form the particles of for example polyvinyl alcohol and sodium tetraborate can be coated in a watersoluble or water-dispersible material for example polyethylene glycol. The particulate envelope material allows the stemming composition to be evenly dispersed in the water before the stemming composition hydrates.
Depending on the ampoule construction, water can be introduced by means of filling nozzle connected to a water line.
In an example 11.5 g of polyvinyl alcohol powder ( < 200 flz particle size, MW 179,000, degree of hydrolysis 88%) was intimately mixed with 4.75 g of sodium tetraborate decahydrate powder and then poured into 1.2 g of molten polyethylene glycol (MW 1,500) which has been melted in a mixing vessel jacketed at 800C with hot water. Mixing was carried out for 1 5 minutes before lowering the jacket temperature to 40 500 C, maintaining the stirring for 5 minutes. The 1 7.45 g of free flowing powder thus produced was placed in a standard size ampoule having a self sealing lip valve and a length of approximately 42 cm and a final diameter of approximately 3 cm. The ampoule was filled with 270 ml of hard tap water and within 3 minutes a firm homogeneous gel was formed within the ampoule.
Claims (14)
1. A method of stemming shot holes comprising tamping the explosive charge in the shot hole with a water-paste stemming material by placing in the shot hole at least one stemming ampoule containing the water-admixed paste characterised in that the stemming ampoule containing a stamming composition and having a sealable filling aperture is filled with water and outside the shot hole, the final stemming material being produced from the water and the stemming composition inside the sealed ampoule before the ampoule is introduced into the shot hole.
2. A method according to Claim 1 in which the ampoule is filled with water underground.
3. A method according to Claim 2 characterised in that the stemming composition comprises a substantially water-free dry material which forms a homogenous gel or paste within the ampoule after filling with water.
4. A method according to any one of Claims 1 to 3 characterised in that the dry stemming composition present in the ampoule contained in a reservoir from which it is released into the water filling.
5. A method according to one of Claims 1 and 3 characterised in that the reservoir containing the dry stemming composition is dissolved by the water filled into the ampoule.
6. A stemming ampoule for carrying out the method according to any one of Claims 1 to 5 comprising a tube of plastics material having a sealable filling aperture or a self-sealing valve through which the tube can be filled with water, the tube containing a quantity of a stemming composition sufficient to form a gel with the water filling.
7. A stemming ampoule according to Claim 6 characterised in that the sensing composition comprises one or more tablets.
8. A stemming ampoule according to Claim 6 characterised in that the stemming composition is in the form of granulate or of instantised flakes.
9. A stemming ampoule according to any one of Claims 6 to 8 characterised in that it comprises a reservoir for the stemming composition attached in the inside wall of the stemming ampoule.
10. A stemming ampoule according to one of
Claims 6 to 9 characterised in that the stemming composition comprises a mixture of borate and gum or resin.
11. A stemming ampoule according to one of
Claims 6 to 9 characterised in that the stemming composition comprises a mixture of polyvinyl alcohol and sodium tetraborate.
12. A stemming ampoule according to any one of Claims 6 to 11 having a tear-off strip which can be removed after the stemming material has been formed in the ampoule to form a slit through which the stemming material exudes when the ampoule is subjected to external pressure.
13. A method of stemming shot holes substantially as hereinbefore described with reference to the accompanying drawings.
14. A stemming ampoule substantially as hereinbefore described with reference to Figure 1, or Figures 2 and 3 or Figure 4 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813118034 DE3118034A1 (en) | 1981-05-07 | 1981-05-07 | "METHOD AND TRIM CAMP FOR INSULATING DRILL HOLES WITH PASTE SET" |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2099117A true GB2099117A (en) | 1982-12-01 |
| GB2099117B GB2099117B (en) | 1985-05-01 |
Family
ID=6131656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8213273A Expired GB2099117B (en) | 1981-05-07 | 1982-05-07 | Stemming shot holes |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE3118034A1 (en) |
| GB (1) | GB2099117B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2186954A (en) * | 1986-02-19 | 1987-08-26 | Forrester Thomas Dobson | Explosives container |
| ES2046916A1 (en) * | 1991-04-10 | 1994-02-01 | Invest Tecnologica De Equipos | Blasting tube for cool seams |
| AU746434B1 (en) * | 2000-11-27 | 2002-05-02 | Bis Industries Limited | A method of stemming a blast hole and a blast hole stemming material |
| EP0951634A4 (en) * | 1997-01-10 | 2002-05-02 | Boyd J Wathen | Method of breaking slabs and blocks of rock from rock formations and explosive shock transmitting and moderating composition for use therein |
| WO2004044520A1 (en) * | 2002-11-12 | 2004-05-27 | Cintec International Limited | A blast-absorbing device |
| RU2350897C1 (en) * | 2007-07-18 | 2009-03-27 | Аркадий Владимирович Дугарцыренов | Method for tamping of blast down holes in single blasts in opencast mines |
| US10030959B2 (en) * | 2013-06-17 | 2018-07-24 | Allen Park | Blasting systems and methods |
| CN114264207A (en) * | 2021-08-16 | 2022-04-01 | 北方工业大学 | Automatic stemming plugging device for blast hole and blast hole plugging method |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4135777A1 (en) * | 1991-10-30 | 1993-02-04 | Wilhelm Leppak | PLug for water bottle - has axially projecting tongue which holds it in bottle neck while bottle is being filled |
| CN109238048B (en) * | 2018-09-10 | 2021-06-08 | 兖州中材建设有限公司 | Surface limestone mine blasting dust-settling method |
| CN109238059A (en) * | 2018-11-02 | 2019-01-18 | 玉溪矿业有限公司 | A kind of blast hole stemming device |
| CN115235309B (en) * | 2022-06-24 | 2023-09-01 | 东北大学 | Self-expansion filling body for blast hole blocking and preparation and construction methods thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD30791A (en) * | ||||
| NL240221A (en) * | 1958-06-16 |
-
1981
- 1981-05-07 DE DE19813118034 patent/DE3118034A1/en not_active Ceased
-
1982
- 1982-05-07 GB GB8213273A patent/GB2099117B/en not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2186954A (en) * | 1986-02-19 | 1987-08-26 | Forrester Thomas Dobson | Explosives container |
| GB2186954B (en) * | 1986-02-19 | 1989-11-08 | Forrester Thomas Dobson | Explosives containers. |
| ES2046916A1 (en) * | 1991-04-10 | 1994-02-01 | Invest Tecnologica De Equipos | Blasting tube for cool seams |
| EP0951634A4 (en) * | 1997-01-10 | 2002-05-02 | Boyd J Wathen | Method of breaking slabs and blocks of rock from rock formations and explosive shock transmitting and moderating composition for use therein |
| AU746434B1 (en) * | 2000-11-27 | 2002-05-02 | Bis Industries Limited | A method of stemming a blast hole and a blast hole stemming material |
| WO2004044520A1 (en) * | 2002-11-12 | 2004-05-27 | Cintec International Limited | A blast-absorbing device |
| RU2350897C1 (en) * | 2007-07-18 | 2009-03-27 | Аркадий Владимирович Дугарцыренов | Method for tamping of blast down holes in single blasts in opencast mines |
| US10030959B2 (en) * | 2013-06-17 | 2018-07-24 | Allen Park | Blasting systems and methods |
| CN114264207A (en) * | 2021-08-16 | 2022-04-01 | 北方工业大学 | Automatic stemming plugging device for blast hole and blast hole plugging method |
| CN114264207B (en) * | 2021-08-16 | 2024-01-09 | 北方工业大学 | Automatic stemming blocking device for blasthole and stemming blocking method |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3118034A1 (en) | 1982-11-25 |
| GB2099117B (en) | 1985-05-01 |
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| PCNP | Patent ceased through non-payment of renewal fee |