Prodn. device for injection base using injection lance inserted in borehole - has two part boring head at lower end of bore worm tube, first part being fixed in tube and second part non-rotatably fixed in first

摘要

The bore worm tube (4) at the lower end (5) is provided with a two-part bore head (6), the first part (7) of which is firmly connected to the end of the tube. The second part is non-rotatably fixed but axially loosely in the first part and releasable under axial pressure with the lower end (1') of the injection lance (1). The lower end of the lance is provided with devices for at least one injection medium outlet. The first part of the bore head is formed from a plate (11), on the periphery of which are bore chisels (12). The second part (8) is part of a bore crown (8') located under the plate (11) and engaging with a throat (10) in a recess (11') of the plate. USE/ADVANTAGE - For finding out if building foundations are below the water table. The prodn. device reduces the number of individual manipulations, the amt. of appts. involved, and the time taken.