Coupling assembly for connecting pipes, and manufacturing method therefor

A coupling assembly for connecting pipes, the coupling assembly comprising:

• two or more couplers disposed to face each other to connect the pipes continuously arranged along an axial direction;
• and
• fasteners configured to assemble the two or more couplers,
• wherein each of the two or more couplers comprises:
• a catch portion configured to be inserted into a fastening groove, which is formed in a first one of the pipes, and having a size corresponding to an outer diameter of the fastening groove, and
• interference prevention grooves configured to prevent interference between the catch portion and the first pipe and formed on both ends of the catch portion to allow an outer circumferential surface of the first pipe to pass through a space between the two or more couplers that are temporarily assembled,
• wherein the catch portion comprises an arch surface facing an outer surface of the fastening groove,
• wherein each interference prevention groove comprises:
• a first extension surface formed to extend outward in a radial direction from the arch surface, and
• a second extension surface formed to extend downward from the first extension surface and having a curvature disposed concentrically with the arch surface,
• wherein the coupling assembly further comprises a rubber ring configured to prevent a fluid leakage and provided between the first pipe and at least one of the two or more couplers,
• wherein each interference prevention groove comprises an auxiliary support surface configured to support a side of the rubber ring to prevent the side of the rubber ring from protruding outward through each interference prevention groove when a water pressure is applied to an inside of the two or more couplers, and
• wherein the second extension surface is disposed to be spaced apart from the outer circumferential surface of the first pipe in a state of being disposed concentrically with the outer circumferential surface of the first pipe and is located further out than the outer circumferential surface of the first pipe in the radial direction.