US1816100A - Method of and explosive member for the blasting of blast-holes - Google Patents

Description

H. G. ULRIK 1,816,100v

METHOD OF AND EXPLOSVE NBER FOR THE .BLASTING O F BLAST HOLES July 2s', 1931.

Filed Aug. 15. 1929' IIIIIII @um iiiii i w iiiiii lllllllllll' .Ill'll `/1 Hop/rey Patented July 28, 1931 UNITED STA 'rlazs PATENT orf-'ICE IHANS GEORG ULBIK, F B'USTENARI, RUMANIA :mamon or' AND ExrLosIvE-Imnxn Fon- THE BLAsTINe 'oF BLAST-HOLES f Application led August 15,` 1929. Serial No. 386,069.

` Heretofore foi; torpedoing blast-holes, thus .for blasting open hollow spaces, in .rocky ground| as well as also in soft ground veryf strong explosive charges were usedy which 'l were enclosed in a thin-walled casing of sheet metal or even of cardboard only. The wall ofthe explosive casing has been very thin and proportioned in view of protecting the char e against moisture only. The explosive memi or percussion fuses were placed into the blastholes of a diameter adaptedto the diameter of the explosive members in such -a manner, that the explosive member contacted as much as possible with the surrounding wall of the blast-hole. y 5 However when workingin hard rocks, the explosion of the explosive members con'- structed in this way resulted in quite other effects than in sand or other'soft ground.- In the first event clefts were formed in the rock owin to the sudden shocks, so that channels or the passage of the oil to the blasthole were formed. Therefore explosions in rocky ground yielded a favourable result if thin-walled explosive members are used. However in soft ground, for instance sand, explosions carried out with explosive mem- Y bers, provided with thin-walled casings 80 containing thecharge, have the result that the said is subjected to a considerable. outwardly directed pressure which radiates from the centre of explosion.` Thereby the sand or the soft ground is compressed and thus is rendered more impenetrable for the v outflow of the oil.. l

This invention relates to an im roved method of and explosive members or the blasting Vof blast-holes in hard, soft, sandy4 or moist rocks or ound with ,the same lfavourable result. lccording tothe present invention, thick-walled ex losive members are used, whichin view o the mechanical force of their splinters break up the rock and in soft ground form channels. These explosive members are units of cylindric shape and of standard size. The charge can be deter# mined and a projectile of any desired length can be produced by suitablyv combinin a number of units 011v the place of workmg.

ers litted with time fuses, electric fuses The initial ignition is carried out by a percussion or time fuse ofknown construction, which is fitted to the projectile at the place of working. i

IExplosive members, provided with percussion fuses, are dropped from outside into the blast-hole, which previously has been filled with water,'and,exp1ode when striking the floor. In the vcase of explosivememberslet down by a rope, the fuse can be vtimed or set before the insertion in the blast-hole or -it can be automatically disengaged when pulling up the rope. K

A suitable division ofthe proj ectile-casing `by notches or bythe insertion of rings, inter'- mediate layers, vwashers and the like causes the falling to pieces into a large number of small splinters which can be readily destroyed bydrilling after the explosion. The

.effect of explosion is carried out preferably in a horizontal direction and the danger of damaging the pipes'is reduced, because the w'alls of the explosive member have taken up the greatest part lof the explosive action, thus according to the construction more than the ends of the projectile. All parts of the explosive member consists of brittle but vnot too hard materials. x

Two modes of carrying out the present in vention are illustrated by way of example on the accompanying sheet of drawings in which- Figs. 1 and 2 show two constructions of the explosive member in longitudinal section.

Fig. 3 is a cross-sectional view of the memier, the section being taken on line A-A of In the construction shown in Fig. 1,- the thick-walled casing lof the .explosive member consists of a brittle material and is provided at bothends with an external screwthread 2 Iand with an internal screw-thread 3. Theinner wall of the casing is provided withl circular grooves or notches 4. Screw threaded caps 5, provided with holes 6`for the insertion of a Spanner, maybe screwed'into' the-.1

internal screw-threads 3 of the casing l.

The hollow compartment 7, remaining between the casing 1 and thel caps 5, serves for the reception of the explosive charge, insulating discs vbeing provided to protect the charge against moisture.

Screw-threaded sleeves 11, cooperating with the external screw-threads 2 of the casings 1, can be used for connecting a number of such explosive members of standard size, in order to form a unit of explosive members. In this case the screw caps 5 may be dispensed Wth. The individual explosive members may be connected to form a unit also by means of a bayonet joint. In place of a screw cap 5, a fuse 15 is screwed into orne end of the projectile consisting ,of a number of explosive members, While the other end thereof is shut by a screw cap 5. The external. screw-thread 2 at this end ofthe casing may be utilized for the attachment of a bracket, eye or-the like through which a rope is passed in order to let down the projectile into the blast-hole.

In the construction shown in Figs. 2 and 3, a large number of metal rings 17, provided with notches or grooves 1 8 at the inner Wall are arranged within the casing 1, furnishe with longitudinally extending grooves 16, in

order to increase the number of splinters as Well as the resistance of the casing.

The explosion with torpedos according to the present invention is also particularly effective invery soft sandy grounds and in connection with blast-holes which for instance in view of repeatedunsuccessful explosions are x considerab y larger than corresponds to'the diameter of the explosive member. The' splinters produce a large number of long channels through which the oil passes from a lar e number of strata into the blast-hole.

Claim'- Y 1. Explosive member for blasting blastholes in soft, oil-bearing rocks, sand and the like, comprising a thick-w lled casing for the explosive charge, and gr oves4 in the cas ing sub-dividing the same into sections,

Where by the explosion the casing is torn into I individual pieces according to the grooves to orm channels 'n the "soft ground through which oil ows i to the blast-hole.

2. Explosive. member for blasting blas'tholes in soft, oil-bearing rocks, sand and the like, comprising a thick-Walled casing for the explosive charge, grooves in the casing, and rings arranged between the' explosive charge and the casing vvhichi'ncrease the resistance of the casing and the'number of splinters.- In testimony whereof I lalix my signature.

HANS GEORG ULRIK.

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