Abstract: A pipeline pig for lining pipe lines with an internal coating of a solidifying plastic composition with which the pipe line is spread by means of the pig, the pipeline pig having at least one spreader body and at least one forward and one rear guide body. The guide body comprises at least three narrow, resiliently elastic guide pieces bent into U-form comprising a middle part with forward and rear U-legs at the ends and rounded transitions from the middle part to the U-legs, the middle parts extending in the axial direction of the pipeline pig for guidance of the pipeline pig in the pipe line by abutment on the inner wall of the pipe line and being offset in relation to one another in the circumferential direction, the forward U-legs being non-displaceably secured in the axial direction in the pig and the rear U-legs being displaceably mounted in the axial direction in the pig and secured to a common bearing.

Abstract: A method for lining main pipes, to which branching domestic connection pipes are connected, with an internal coating of a hardening plastic composition with which the main pipe is spread, comprising introducing from the interior of a house an inflatable bladder with a connected pressure line into an opened domestic connection pipe into a region of its junction with the main pipe, inflating the bladder through the pressure line and closing the domestic connection pipe tightly in pressure-tight manner by the bladder in the region of the junction with the main pipe, spreading the main pipe with plastic composition to form an internal coating therein. A composition plug, being determined in size by the position of the bladder, thereby is forced into the junction of the domestic connection pipe.