Sentence Examples with the word tubbing

The interval between the back of the tubbing and the sides of the borehole is then filled up with concrete, which on setting fixes the tubbing firmly in position.

The whole weight of the tubbing is made to bear on the moss, which squeezes outwards, forming a completely water-tight joint.

The water-tight lining may be either a wrought iron tube, which is pressed down by jack screws as the borehole advances, or cast iron tubbing put together in short complete rings, in contradistinction to the old plan of building them up of segments.

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This method necessitates the use of very considerable pumping power during the sinking, as the water has to be kept down in order to allow the sinkers to reach a water - tight stratum upon which the foundation of the tubbing FIG.