Abstract: A submergible pile driving apparatus is suspended from a string of rigid tubes 12 to minimize twisting during operation, and the tubes also carry conduits 18, 19 for transmitting hydraulic, pneumatic and electrical power to the apparatus. The upper connections to the conduits are via flexible hoses 25, 26 through a coupling piece 20 inserted in the string below its point of suspension at eye 13, and the lengths of the hoses are adapted to the length of the pile 7 to be driven, whereby continuous operation is possible. That is, locking beams 16 may be engaged with a tube flange to take up the weight of the suspended string and apparatus while a further tube is added to the upper end of the string, without interrupting the driving operation.

Abstract: There is disclosed a system for subaqueous pile driving in which the pile and the hammer are completely submerged. The pile is suspended by at least one cable in such a manner that two cable sections are run in an upward direction from the top of the pile in a parallel manner toward a device located above sea level. The pile is lowered on the cables to the ocean floor, and the pile driving hammer positioned on top of it simultaneously with the pile hammer guided on cable sections. A traverse bore is provided in the pile for passage of the cable, and a temporary support base is provided having slidable frictional contact with the pile for enlarging the base of the pile on the ocean floor.

Abstract: Noise radiated into the atmosphere from a pile during pile-driving is inhibited by a tubular cover of flexible material having internal dimensions sufficient to pass, with an intervening air space, over a pile to be driven and an extended length sufficient to enclose a pile over its entire length, said cover being suspended from a hammer driving unit or a pile cap and being axially collapsible to reduce its length as the hammer driving unit or pile cap moves downwards while a pile enclosed in the cover is being driven into the ground.