A pipe loosening device and methods are shown. In one example, the pipe loosening device enables a method wherein a pipe to be replaced is deformed but not burst, and a portion of a sidewall of the pipe is forced outward into the surrounding soil to compact a local region of the surrounding soil and loosen the existing pipe. The pipe may then pulled from the ground along an axis of the pipe.

Disclosed is a pipe connection device for repairs that connects first and second pipes by extending a length of inner and outer connection pipes, wherein the first and second pipes are connected using the inner and outer connection pipes in a state in which the inner and outer connection pipes are fixed while extended to be proportional to a length between the first and second pipes by a detachment preventing protrusion being caught in and fixed to a detachment preventing groove while an inner catching step is caught on an outer catching step to limit sliding.

A method of cutting and removing a section of pipe, such as prestressed concrete cylinder pipe, and installing a replacement gate valve while the pipeline is fully pressurized by use of a replacement valve body. The replacement valve body includes two cylinders that match the openings of the cut pipe, and inside each of the two cylinders is a cut-covering assembly which includes a cylindrical elastomeric seal and a spring tube. The replacement valve body further includes a linear moving gate in a central portion of the valve, and when the cylinder ends of the replacement valve body are positioned adjacent the bores of cut pipe ends, the gate can be moved to push the elastomeric seals of each of the cut-covering assemblies into the bores of the cut pipe ends, thereby covering gaps created when the pipe was cut and placing the pipe ends in fluid-tight engagement with the replacement valve body.