Patent GB-470051-A (GB)
Title: Improvements in or relating to earth boring
IPC: E21B7/04
Filed: 1936-09-28
Abstract: 470,051. Boring earth. PEREBASKINE, V., GRAVIROWSKY, P., and NIKITINE, S. Sept. 28, 1936, No. 26299. Convention date, Sept. 28, 1935. - [Class 85] For increasing the production of wells, solidifying soil by injecting cement &c., one or more side bore holes are formed in a vertical or sub. stantially vertical shaft by a rigid sectional boring member, the lengtl of which progressively increases as the boring proceeds. A casing 1 is secured by frangible rivets 43 to e cap 3 connected to tubes 4 by which the device is lowered, and has a lateral orifice 5 through which the tubes 6 are ejected horizontally or at an incline. Within the casing is a magazine 9, Fig. 7, with a branch 12 leading to the orifice 5 and in which a tube section 6a, carrying a boring tool 8, is initially placed ; the tool 8 is driven by a hydraulic motor, which may comprise two eccentric rotors fluid being supplied thereto through tubes 4 and casing 1. A frame 10 slidable vertically in the magazine 9 supports on bars 11 further tube sections 6 held between springs 13 and pivoted fingers 14. A tongue 21, Fig. 13, pressed by a spring 22, is adapted to engage the bars 11 successively, a member 23, pressed by spring 24, being adapted to lock the tongue 21. The tube sections are successively engaged by a pivoted head 19, Fig. 9, on a lever 16 which is oscillated by hydraulic pistons 17, Figs. 7 and 8, and rods 18 to eject the sections. During the return movement of the lever 16, a pivoted spring-pressed pawl 33 thereon, Fig. 14, engages the pivoted spring- pressed tip 31 of a slide 30 to move the latter until the tip 31 yields into a recess 36 this movement causes a pivoted lever 27 to raise the member 23, Fig. 13, clear of the tongue 21 which yields to allow the frame 10 to fall one step, the fall being cushioned by contact of a lower bar 11 with an inclined slide 38, Fig. 7, connected to the piston rod 42a of a dashpot, and returned by a spring 42. Also during the fall, one of the pivoted fingers 14 contacts a shoulder 15, Fig. 7, and pivots to force the adjacent tube section 6 through the branch 12 for subsequent ejection. After sufficient tubing 6 has been forced into the ground, the rivets 43 may be broken and the cap 3 reciprocated so that a guillotine edge 46 thereon cuts off the tubing adjacent the casing 1 ; alternatively, the last tube section may have a groove 48, Fig. 6, for engagement with springs 47 on the head 19 which return it into the casing while leaving the remaining sections in the ground. The hydraulic means 17, 18 may be replaced by electric, pneumatic or screw means. The tube sections may have apertures 49, Fig. 5, for the passage of oil or water, or ejection of cement &c. ; during boring, the apertures are closed by a soluble substance, or valves are provided therein. The sections may have spigot and socket joints as in Fig. 5 ; alternatively, bayonet or screw joints may be used, connections then being made by rotating the tube sections through racks 50, Fig. 8, reciprocated by the hydraulic means 17, 18, and a train of gearing including a slipping clutch comprising concentric members 57, 57a, Fig. 12a, connected by resiliently mounted radial fingers 57b. The last wheel 58, Fig. 20,of this train of gearing is adapted during the traverse of the head 19 temporarily to engage teeth on the latter which rotates the adjacent tube section through clutch teeth. Alternatively, the tube sections may be automatically connected by steeply inclined threads without rotation of the head. In another form, the boring is effected by rotation effected by a motor or from above ground through a train of gearing, the tubes then having a non-circular form and the sections having inter-locking parts. In another arrangement for connecting or disconnecting the tube sections, the head 19 has a split sleeve 69, Fig. 23, adapted to enter the rear tube section ; during advance of the head 19, an interrupted groove 77, Fig. 21, causes axial movement of a spring-pressed rod 75 which, through a crank 74, rotates a mandrel 72, the latter advancing by screw means and the frusto-conical end thereof spreading the sleeve 69 to lock the tube section to the head 19. The tubes may be ejected under hand control, and pneumatic or electric driving means may be provided.