Pipe connection device for repairs

A pipe connection device for repairs, the pipe connection device comprising:

• an inner connection pipe (100), which has a hollow shape whose front and rear portions are open and has a connection pipe (101) formed at one end in order to be inserted into a first pipe (P1) cut to have a predetermined length, a detachment preventing groove (101a) formed to be recessed along an outer surface of the connection pipe (101), and a pipe expanding part (102) formed to expand at a rear end of the connection pipe (101) and forming an outer catching step (102a) between the connection pipe (101) and the pipe expanding part (102);
• and
• an outer connection pipe (200), which has a hollow shape whose front and rear portions are open, is inserted and coupled to surround an outer surface of the inner connection pipe (100), and has a detachment preventing protrusion (202) formed to protrude along an inner circumferential surface of one end to correspond to the detachment preventing groove (101a) and be caught in and fixed to the detachment preventing groove (101a), the other end fastened to surround an outer surface of a second pipe (P2), which is cut and faces the first pipe (P1), to connect the inner connection pipe (100) and the second pipe (P2), and an inner catching step (201) formed on an inner circumferential surface in order to be caught on the outer catching step (102a) and prevent the inner connection pipe (100) from being inserted to a predetermined depth or more into the outer connection pipe (200).