Driveable pile connections

摘要

Connections for attaching together successive sections of an axially driveable pile, including pin and box ends having engaging threads which are tapered and which as viewed in axial section have opposite side faces both disposed at a very small angle of not over about 5.5 degrees with respect to a line extending perpendicular to and intersecting the axis of the threaded connection, preferably between about 4.5 and 5.5 degrees, so that the threads can take very high axial driving and rebounding forces. Each thread desirably has an axial thickness at its pitch line at least about one and one-half times the height of the thread from its root to its crest. The pin and box elements preferably do not have shoulders engageable to limit the extent to which the parts can be screwed together in the fully made-up condition of the joint. A locking ring or rings may be carried about one of the threaded sections and have lugs receivable within notches formed in the two sections to lock them against relative rotation in the made-up condition of the joint.