GB885894A - Improvements relating to blasting - Google Patents

Abstract

885,894. Blasting devices and tampings. PETERS, J., and PETERS, A., [trading as PETERS KOMM.-GES, JOSEF], June 16, 1959 [June 16, 1958; Aug. 2, 1958; Aug. 30, 1958; Oct. 17, 1958; Nov. 7, 1958; Jan. 23, 1959; Feb. 2, 1959; June 1, 1959], No. 20687/59. Class 9(1). FIG.5. FIG. 1. FIG. 10. FIG. 13. A container 1 to be filled with water and inserted in a borehole is moulded from synthetic material with a closed end 2 of ogival shape and is provided with a filling neck 3, which may be sealed by compressing a ring 4 thereon. Fig. 5 shows a cover 6 which is screwed over the neck, a member 8 extending from the cover being provided to apply pressure to the water introduced into the container 1. The container, Fig. 6, may comprise several connected chambers 9, 10, 11, each sealed by a ring 4. Partitions arranged longitudinally (not shown) of the container may form the chambers. A single-chambered container may have constrictions along its length or its outer surface may have grooves parallel to its longitudinal axis. Projections 18, Fig. 10, may be spaced along the surface of the container. Substances which on contact with the water increase the pressure in the container may be housed in fragile hollow bodies, e.g. of thin glass, placed in the container, so that immediately before insertion in a borehole the bodies may be crushed. These bodies may be spheres or tubes. A ring 20, Fig. 13, may be placed on the container 1 to hold it in a borehole, the ring being notched along its periphery to allow for variations in the diameter of the hole.