US3541797A - Apparatus for loading boreholes - Google Patents

Apparatus for loading boreholes Download PDF

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Publication number
US3541797A
US3541797A US755108A US3541797DA US3541797A US 3541797 A US3541797 A US 3541797A US 755108 A US755108 A US 755108A US 3541797D A US3541797D A US 3541797DA US 3541797 A US3541797 A US 3541797A
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Prior art keywords
borehole
holes
nozzle
tubular member
mass
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Expired - Lifetime
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US755108A
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English (en)
Inventor
Iain G H Stewart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
African Explosives and Chemical Industries Ltd
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African Explosives and Chemical Industries Ltd
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
    • 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
    • F42D1/10—Feeding explosives in granular or slurry form; Feeding explosives by pneumatic or hydraulic pressure

Definitions

  • FIGURE 3 NW. H4, 1970 I. G. H. STEWART 3,541,797
  • the apparatus comprises a tubular member having an open bore, at least one flexible annular element mounted on the tubular member and a flexible hose connecting the inlet end of the tubular member to supply means for supplying the slurried or plastic mass.
  • This invention relates to loading boreholes. More particularly, it relates to loading holes bored in civil engineering and mining operations for the purposes of cement grouting, foundation construction and blasting with explosives.
  • the chief object of the present invention is to enable operators to fill boreholes more completely with loading materials than appears feasible with known procedures.
  • a further object is to load wet boreholes in such a manner that the loading materials are not deleteriously affected by the water in the holes.
  • this invention provides apparatus comprising a tubular member having an open bore, at least one flexible annular element mounted on the tubular member and a. flexible hose connecting the inlet end of the tubular member to supply means for supplying the slurried or plastic mass.
  • the flexible annular element may be a flat 3,541,797 Patented Nov. 24, 111970 ring or washer or disc of a suitable material such as natural or synthetic rubber or a synthetic plastics material.
  • the ring In order to hold the ring securely on the tubular member or nozzle of the apparatus, it may be seated in a groove or slot encircling the tubular member transverse to its longitudinal axis.
  • the ring may be clamped on the tubular member by suitable means fitted to the member. Clamping and screwing devices for securing annular fittings around the outer circumference of pipes and tubes are well known and are, therefore, not described and illustrated in this specification. Any such mechanical means suitable for the purpose may be employed.
  • the major portion of the ring stands proud of the surface of the tubular member to provide a circular disc-like structure on the body of the member.
  • two flexible annular elements are mounted on the tubular member. Such an arrangement assists in aligning the apparatus centrally in the hole and, thereafter, maintains it in a position substantially co-axial with the hole during its passage through the hole.
  • At least one of the flexible annular elements is paired with a second, co-operating flexible annular element of greater diameter and having performations therein to perform in combination with the element as a non-return valve.
  • the perforations in the second flexible annular element may be orifices or slots through its material surrounding the tubular member.
  • FIG. 1 is a view in perspective of the apparatus
  • FIG. 2 is a view, partly in section, of a borehole and apparatus at the commencement of a borehole loading operation
  • FIG. 3 is a view, partly in section, of a borehole and apparatus at the conclusion of a borehole loading operation
  • FIG. 4 is a view in perspective of another embodiment of the invention.
  • FIG. 5 is a view, partly in section, of a borehole and the apparatus illustrated in FIG. 4 at the commencement of a borehole loading operation
  • FIG. 6 is a view, partly in section, of a borehole and the apparatus illustrated in FIG. 4 at the commencement borehole loading operation.
  • FIG. 1 shows the complete assembly of tubular member 4, flexible annular elements 5 and 6 and flexible hose 7.
  • the tubular member 4 is illustrated as a nozzle with an open bore, the inlet end of which communicates with the bore of the hose 7 and the outlet or discharge end of which is shown at 8.
  • the hose 7 covering the inlet end of the nozzle 4 may be fastened thereto by a circular clip but, usually, the grip of the hose over the end of the nozzle is sufficiently tight to prevent disengagement during a loading operation.
  • the end of the hose 7 remote from the nozzle 4 is connected to supply means, such as a pump, a pressurized slurry container or a mixer-placer unit provided with a pump (not shown), for supplying the slurry or plastic mass under pressure to the nozzle 4.
  • supply means such as a pump, a pressurized slurry container or a mixer-placer unit provided with a pump (not shown), for supplying the slurry or plastic mass under pressure to the nozzle 4.
  • the flexible annular elements 5 and 6 are flat neoprene rings or discs secured in shallow, circular grooves as at 9 and 10 on the nozzle 4.
  • the apparatus is pushed down a borehole 11 by means of hose 7 until it is felt to have touched the bottom of the hole as illustrated in FIG. 2. If there is water in the hole, it is displaced past the rearwardly flexed neoprene rings. The neoprene rings and 6 are then flexed into the opposite direction by slightly retracting hose 7. At this stage, the neoprene rings 5 and 6 act as flexible seals between the nozzle 4 and the wall 12 of the borehole 11. Pumping of the slurry or plastic mass is then started.
  • the neoprene ring 5 and the surface of the nozzle 4 projecting from itis filled with the mass 13 the pressure exerted by the discharge from outlet 8 of the continuing flow of mass 13 forces the apparatus to rise in the borehole 11.
  • water as indicated by reference numeral 14, lying in the borehole, it may have been urged to flow past the ring 5 by the mass 13 and will then be raised by the piston action of the nozzle as the nozzle is displaced from the bottom of the hole.
  • the neoprene rings act as barriers to separate the mass 13 from the water 14 as well as to ensure that the space forwardly of ring 5 in the borehole 11 is completely filled with the mass 13.
  • the neoprene rings 5 and 6 are flexed in the direction as shown in FIG. 3. In this trailing position, the efficiency of the seal improves with the increase of pressure differential across the neoprene ring 5. A portion of the mass 13 may escape into the space between the two rings 5 and 6 due to surface irregularities in the borehole. However, this action will only further serve to ensure that the borehole 11 is completely filled with mass 13 to the exclusion of water 14 and unwanted air gaps.
  • nozzle 4 and neoprene rings 5 and 6 acts as a sealing piston in the borehole 11, while accommodating variations in the diameter of the borehole, which may be likened to a cylinder. Moreover, the operator does not have to exercise any control over the rate of speed of withdrawal of the apparatus from the borehole. Having inserted the apparatus in the borehole and reversed the flexure of the flexible rings, he may then let it be ejected at a controlled rate, which is governed entirely by the rate at which the borehole 11 is being properly filled by mass 13.
  • FIG. 3 The conclusion of the borehole loading operation is illustrated in FIG. 3, at which stage the pumping of the mass 13 through hose 7 is stopped. There may be a marker on the hose 7 adjacent the inlet end of the nozzle 4 as a visual warning to the operator to stop pumping or, if desired, pumping may be stopped as soon as the inlet end of the nozzle appears at the mouth of the borehole 11.
  • the apparatus is then removed from the borehole 11 and inserted into another borehole, when the loading procedure described above is repeated.
  • mass 13 is an explosive composition
  • stemming material such as rock cuttings or rubble
  • reference nu meral 15 indicates a tubular member with an open bore, such as a nozzle. Its inlet end communicates with the bore of flexible hose 16 and that end of the nozzle 15 may be secured within the hose 16 by means of a fastener or circular clip 17, if considered necessary.
  • the outlet or discharge end of the nozzle 15 is shown at 18.
  • the free end of the hose 16 is connected to supply means, such as a pump or pressurized supply hopper (not shown), for supplying the slurry or plastic mass under pressure to the nozzle 15.
  • supply means such as a pump or pressurized supply hopper (not shown)
  • supply means such as a pump or pressurized supply hopper (not shown)
  • this assembly there is illustrated one pair of flexible annular elements intended to act in combination as one unit 19. There may be more than one such unit 19 mounted on nozzle 15 or there may be both the type 5 and 6 and the type 19 of flexible annular elements mounted on the same nozzle.
  • Element 20 is similar to elements 5 and 6 of FIG. 1 but element 21 is of greater diameter than element 20 and has perforations through its material such as, for instance, slots 22.
  • element 20 may be as shown and is of a size which gives little, if any, contact with the wall of the borehole for which it has been selected as having suitable dimensions.
  • the method for filling a borehole 11, when using the assembly of FIG. 4, follows the same steps as are described above with reference to FIGS. 2 and 3. This description will be amplified with reference to FIGS. 5 and 6 to explain more exactly the action of the paired elements 20 and 21, co-operating to perform as a unit 19 or flexible annular element 19.
  • element 21 is flexed in the opposite direction as previously described.
  • the second or perforated element 21 is flexed in the opposite direction to press against the non-perforated element 20, as shown in FIG. 6.
  • This action closes the perforations 22 and the build up of pressure, created by the mass 13 being pumped into the borehole 11, forces the element 20 against the element 21 and ensures a firm and positive closure of the perforations 22.
  • the pair 19 of elements 20 and 21 then act as a single unit in the same manner as element 5 or element 6 in the alternative embodiment of the invention shown in FIG. I and described above.
  • EXAMPLE I Tests were carried out at the semi-technical plant of applicant.
  • a vertical pipe having a bore of four inches and a length of twenty feet, was filled with water.
  • a positive displacement pump having a two inch outlet, and seventy feet of plastic tubing of two inch bore connected to the apparatus assembly as exemplified by FIG. 1, the pipe was completely loaded with a dummy explosive slurry. It was observed that the water flowed evenly from the pipe as the apparatus filled it with the slurry and that the apparatus rose steadily in the pipe during the loading operation.
  • the temperature of the water flowing from the pipe did not fall, indicating that there had not been any mixing with the particulate urea in the dummy slurry, which would have lowered the temperature of the resulting solution formed and discharged from the pipe.
  • the quantity of slurry estimated to fill the pipe corresponded very nearly with the volume of the pipe.
  • Example II The test conducted in Example I was repeated three times, using two of the units 19--as illustrated in FIG. 4 as the flexible annular elements mounted on the nozzle in place of the two rings previously used.
  • Example III The test conducted in Example II was repeated but in the absence of water. The dry pipe was loaded successfully to its full capacity with the dummy explosive slurry, indicating that no air gaps were interrupting the continuity of the slurry column.
  • Example IV The test conducted in Example II was repeated but in the absence of water. The dry pipe was loaded successfully to its full capacity with the dummy explosive slurry, indicating that no air gaps were interrupting the continuity of the slurry column.
  • EXAMPLE V A test was conducted in the quarry of the Mooiplaas Dolomite Quarry at Cordelfos in the Transvaal. Six holes were drilled in loose boulders on the quarry floor measuring one and a half inches in diameter by five feet in depth. Two of these holes were horizontal while four holes sloped upwardly from the horizontal level at various angles between fifteen to twenty degrees. Only one ring, of the type exemplified by FIG. 1, was mounted on the nozzle. Each hole was loaded by the apparatus with six pounds of an explosive slurry composition.
  • stope holes measuring 1 /2 inches diameter by 42 inches deep. Angled downwardly and full of water.
  • EXAMPLE VII A test was conducted in a stope on the property of the Vlakfontein Gold Mining Company on the following boreholes, which had been drilled just prior to the time of the test.
  • the apparatus worked smoothly with one ring, of the type exemplified by FIG. 1, mounted on the nozzle and all holes were loaded with a pumpable, explosive slurry composition.
  • EXAMPLE VIII A test, included in simulated shaft sinking experiments on the property of the Vlakfontein Gold Mining Company, was conducted on eight boreholes measuring one and a half inches by five feet deep. Four of these holes were vertical cut holes and four holes, which surrounded the cut holes, were easers. The cut holes are blasted first and the subsequent blasting of the easers widens the hole created by the first blasting operation.
  • the working place was flooded to a depth of about six inches under water after completion of the borehole drilling. All eight holes were then loaded with a pumpable, explosive slurry composition through an apparatus assembly as exemplified by FIG. 1.
  • EXAMPLE IX A test was conducted on the floor of the quarry of the Mooiplaas Dolomite Quarry during a pop shooting or secondary blasting operation. This is an operation, which takes place after the main blasting operation, to break up oversize material too heavy for removal or treatment.
  • An advantage of the present invention is that it provides a means for loading boreholes at any inclination to the horizontal.
  • a further advantage is that the apparatus enables the proper filling of holes of small diameter with viscous masses.
  • the size of the hole will determine the choice of size of nozzle and rings.
  • fairly large variations in borehole diameters may be accommodated by a given set of flexible rings.
  • apparatus for filling a borehole with a slurried or plastic mass, apparatus comprising a tubular member having an open bore with an inlet for supply of said mass and an outlet therefor at the opposite end thereof, at least one flat flexible annular element mounted on the tubular member of a dimension larger than the borehole and adapted for continuous circumferential contact with said borehole, said element being flexed rearwardly by contact with the borehole as said member is moved into and out of said hole, said element functioning to serve as a barrier to mass discharged into said borehole from said outlet so that said tubular member is moved out of said borehole by the action of said discharged mass against said element as the borehole is filled, and a flexible hose connecting the inlet end of the tubular member to supply means for supplying the slurried or plastic mass.
  • Apparatus for filling a borehole with a slurried or plastic mass comprising a tubular member having an open bore, at least one flexible annular element mounted on the tubular member and a flexible hose connecting the inlet end of the tubular member to supply means for supplying the slurried or plastic mass, at least one of the flexible annular elements being paired with a second, co-operating flexible annular element of greater diameter and having perforations therein to perform, in combination with the element as a non-return valve.
  • apparatus for filling a borehole with a slurried or plastic mass, apparatus comprising a tubular member having an open bore, at least one flexible annular element mounted on the tubular member and a flexible hose connected to the inlet end of the tubular member, the free end of the flexible hose being adapted for connection to means for supplying the slurried or plastic mass, at least one of the flexible annular elements being paired with a second, cooperating flexible annular element of greater diameter and having perforations therein to perform in combination with the element as a non-return valve.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Agronomy & Crop Science (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Soil Sciences (AREA)
  • Nozzles (AREA)
  • Earth Drilling (AREA)
  • Supply Of Fluid Materials To The Packaging Location (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)
US755108A 1967-08-29 1968-08-26 Apparatus for loading boreholes Expired - Lifetime US3541797A (en)

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Application Number Priority Date Filing Date Title
ZA675162 1967-08-29

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US (1) US3541797A (Direct)
DE (1) DE1758885B1 (Direct)
ES (1) ES357656A1 (Direct)
FR (1) FR1597508A (Direct)
GB (1) GB1202478A (Direct)
IE (1) IE32836B1 (Direct)
NO (1) NO119515B (Direct)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2168360A1 (Direct) * 1972-01-18 1973-08-31 Canadian Ind
US3892101A (en) * 1972-06-26 1975-07-01 Gd Anker Gmbh & Co Kg Method of anchoring an anchoring bolt in a bore hole
US3930639A (en) * 1972-12-05 1976-01-06 The United States Of America As Represented By The United States Energy Research And Development Administration Pumpable rockbolt method
US3949561A (en) * 1974-06-27 1976-04-13 Chapman Roger S Soil grouting apparatus
US4003429A (en) * 1972-08-17 1977-01-18 Ici Australia Limited Apparatus for loading gas-conveyed particulate solids into a borehole
US4079592A (en) * 1977-03-04 1978-03-21 The United States Of America As Represented By The Secretary Of The Interior Method of and apparatus for feeding and inserting bolts in a mine roof
US4509884A (en) * 1983-05-02 1985-04-09 Lily Corporation Injection nozzle for adhesive materials
US4542941A (en) * 1981-12-10 1985-09-24 Stromquist Donald M Method and apparatus for conveying slurry explosives
FR2617880A1 (fr) * 1987-07-06 1989-01-13 Soletanche Procede et dispositif pour substituer dans un forage un liant hydraulique a une boue de perforation
US4832533A (en) * 1983-10-21 1989-05-23 Ringesten Bjoern Process for reinforcing soil structure
US5069108A (en) * 1990-06-07 1991-12-03 Serge Dion Blasting device for unblocking mine raises
US5584222A (en) * 1993-02-25 1996-12-17 Nitro Nobel Ab Method for charging bore-holes with explosive
US5610358A (en) * 1994-12-02 1997-03-11 Ici Australia Operations Proprietary Limited Apparatus and process for explosives blow loading
US7258054B1 (en) * 2000-03-28 2007-08-21 Utec Corporation, Llc Continuous explosive charge assembly for use in an elongated cavity
WO2010051588A1 (en) * 2008-11-06 2010-05-14 Dyno Nobel Asia Pacific Ltd Explosive charging
WO2011131998A1 (en) * 2010-04-23 2011-10-27 Minova International Limited Improvements in or relating to cementitious compositions
CN104213563A (zh) * 2014-09-29 2014-12-17 中国建筑一局(集团)有限公司 桩芯承压水封堵器及其施工方法
RU2709123C1 (ru) * 2018-12-28 2019-12-16 Акционерная Компания "АЛРОСА" (публичное акционерное общество) (АК "АЛРОСА" (ПАО)) Устройство для заряжания восстающих скважин и способ заряжания

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2243192A1 (de) * 1972-09-01 1974-03-14 Dynamit Nobel Ag Verfahren zum fuellen von wasserfuehrenden bohrloechern mit sprengstoffen
CA1315573C (en) * 1989-05-12 1993-04-06 Phil O'garr Method and apparatus for charging waterlogged boreholes with explosives
DE4439546C1 (de) * 1994-11-05 1996-02-01 Geo Bohrtechnik Gmbh Verfahren zum dauerhaften Verschließen von Erdreich-Bohrungen
SE509273C2 (sv) 1997-06-05 1999-01-11 Nitro Nobel Ab Förfarande och anordning för laddning av borrhål med sprängämne
US6564686B1 (en) 2000-03-28 2003-05-20 Utec Corporation, L.L.C. Continuous explosive charge assembly and method for loading same in an elongated cavity

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2719768A (en) * 1952-11-15 1955-10-04 Jack C Webber Well tools and sealing means therefor
US2729067A (en) * 1951-09-18 1956-01-03 Intrusion Prepakt Inc Method for forming piles
US3255592A (en) * 1961-05-01 1966-06-14 Herman L Moor Control system for discharging concrete grout to form piles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1842107A (en) * 1929-08-08 1932-01-19 Charles F Lytle Art and apparatus for sealing off oil wells

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2729067A (en) * 1951-09-18 1956-01-03 Intrusion Prepakt Inc Method for forming piles
US2719768A (en) * 1952-11-15 1955-10-04 Jack C Webber Well tools and sealing means therefor
US3255592A (en) * 1961-05-01 1966-06-14 Herman L Moor Control system for discharging concrete grout to form piles

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2168360A1 (Direct) * 1972-01-18 1973-08-31 Canadian Ind
US3892101A (en) * 1972-06-26 1975-07-01 Gd Anker Gmbh & Co Kg Method of anchoring an anchoring bolt in a bore hole
US4003429A (en) * 1972-08-17 1977-01-18 Ici Australia Limited Apparatus for loading gas-conveyed particulate solids into a borehole
US3930639A (en) * 1972-12-05 1976-01-06 The United States Of America As Represented By The United States Energy Research And Development Administration Pumpable rockbolt method
US3949561A (en) * 1974-06-27 1976-04-13 Chapman Roger S Soil grouting apparatus
US4079592A (en) * 1977-03-04 1978-03-21 The United States Of America As Represented By The Secretary Of The Interior Method of and apparatus for feeding and inserting bolts in a mine roof
US4542941A (en) * 1981-12-10 1985-09-24 Stromquist Donald M Method and apparatus for conveying slurry explosives
US4509884A (en) * 1983-05-02 1985-04-09 Lily Corporation Injection nozzle for adhesive materials
US4832533A (en) * 1983-10-21 1989-05-23 Ringesten Bjoern Process for reinforcing soil structure
FR2617880A1 (fr) * 1987-07-06 1989-01-13 Soletanche Procede et dispositif pour substituer dans un forage un liant hydraulique a une boue de perforation
US5069108A (en) * 1990-06-07 1991-12-03 Serge Dion Blasting device for unblocking mine raises
US5584222A (en) * 1993-02-25 1996-12-17 Nitro Nobel Ab Method for charging bore-holes with explosive
US5610358A (en) * 1994-12-02 1997-03-11 Ici Australia Operations Proprietary Limited Apparatus and process for explosives blow loading
US7258054B1 (en) * 2000-03-28 2007-08-21 Utec Corporation, Llc Continuous explosive charge assembly for use in an elongated cavity
WO2010051588A1 (en) * 2008-11-06 2010-05-14 Dyno Nobel Asia Pacific Ltd Explosive charging
US8381654B2 (en) 2008-11-06 2013-02-26 Dyno Nobel Asia Pacific Pty Limited Explosive charging
AU2009311258B2 (en) * 2008-11-06 2013-11-21 Dyno Nobel Asia Pacific Pty Limited Explosive charging
WO2011131998A1 (en) * 2010-04-23 2011-10-27 Minova International Limited Improvements in or relating to cementitious compositions
EA022450B1 (ru) * 2010-04-23 2016-01-29 Майнова Интернэшнл Лимитед Усовершенствования, связанные с цементирующими композициями
CN104213563A (zh) * 2014-09-29 2014-12-17 中国建筑一局(集团)有限公司 桩芯承压水封堵器及其施工方法
CN104213563B (zh) * 2014-09-29 2016-01-20 中国建筑一局(集团)有限公司 桩芯承压水封堵器及其施工方法
RU2709123C1 (ru) * 2018-12-28 2019-12-16 Акционерная Компания "АЛРОСА" (публичное акционерное общество) (АК "АЛРОСА" (ПАО)) Устройство для заряжания восстающих скважин и способ заряжания

Also Published As

Publication number Publication date
DE1758885B1 (de) 1970-06-04
ES357656A1 (es) 1970-03-16
GB1202478A (en) 1970-08-19
NO119515B (Direct) 1970-05-25
FR1597508A (Direct) 1970-06-29
IE32836B1 (en) 1973-12-28
IE32836L (en) 1969-02-28

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