Casing string for diving in the rocks ITS MARITIME hit

摘要

Asking the casing string is intended for dipping it in the seabed rock blows during drilling, construction on Waters pile foundation, piers. The column shoe comprises pipes and connecting them to the coupling. The outer diameter of the lower end of the pipe over a length of 40 × 10 ^-3 m from the end of the thread runout by 1.5 · 10 ^-3 m smaller than the outer diameter of the rest of the tube and it is dressed with a gap of 0.5 × 10 ^-3 m diameter ring height 30 × 10 ^-3 m of steel with high impact strength. The outer ring diameter equal to the outer diameter of the sleeve, the ends of the ring and the upper sleeve end and flat with side bevels. It enables more energy-efficient knock-shells and the tube immersed in the rock of large diameters and large depths improves the reliability of operation of the column and the rate of its immersion in the rock due to exclusion couplings deformations. 3 yl.