A pipelayer is provided which is capable of effectively transporting pipes or
the
like and stably carrying out load hoisting operation on a slope. The pipelayer
comprises: an undercarriage; an upper revolving superstructure mounted on the undercarriage
so as to turn around freely upon the undercarriage; a boom supported by the upper
revolving superstructure so as to be freely raised and lowered; a pulley block
attached to the boom through a universal joint; a hoist mounted on the upper revolving
superstructure; a hoist hook hung by a wire rope that is paid out from the hoist
and wound around the pulley block.
