Method for rehabilitating an existing pipe

A method for rehabilitating an existing pipe in a piping facility having an existing main pipe intersecting with an existing service pipe, comprising the steps of:

• laying a rehabilitating pipe inside the existing service pipe so that the rehabilitating pipe crosses over the existing main pipe;
• forming a hole in the rehabilitating pipe at a position thereof intersecting with the existing main pipe;
• preparing a flanged tubular member having a tubular part and a flange part on one end of the tubular part;
• adhesively fixing the flange part of the flanged tubular member to an inner circumferential surface of the rehabilitating pipe;
• and
• inserting the tubular part of the flanged tubular member through the hole of the rehabilitating pipe and into the existing main pipe and adhering the tubular part to an inner circumferential surface of the existing main pipe to thereby seal a gap between an inner circumference of the existing service pipe and an outer circumference of the rehabilitating pipe.

A method for rehabilitating an existing pipe in a piping facility having a first existing pipe intersecting with a second existing pipe, comprising the steps of:

• laying a rehabilitating pipe inside the first existing pipe so that an end surface of the rehabilitating pipe is generally aligned with an end surface of the first existing pipe and an inner circumferential surface portion of the second existing pipe;
• preparing a flanged tubular member having a tubular part and a flange part on one end of the tubular part;
• bonding the flange part of the flanged tubular member to the inner circumferential surface portion of the second existing pipe and to the end surfaces of the rehabilitating pipe and the first existing pipe;
• and
• inserting the tubular part of the flanged tubular member into the rehabilitating pipe and bonding the tubular part to an inner circumferential surface of the rehabilitating pipe to thereby seal a gap between an inner circumference of the first existing pipe and an outer circumference of the rehabilitating pipe.

A method for rehabilitating an existing pipe in a piping facility having at least first and second intersecting existing pipes, comprising the steps of:

• providing a first rehabilitating pipe having a tubular portion and a flange portion extending from the tubular portion;
• laying the first rehabilitating pipe inside the first existing pipe so that the flange of the first rehabilitating pipe extends into the second existing pipe;
• bonding the flange portion of the first rehabilitating pipe to an inner circumferential surface portion of the second existing pipe;
• bonding the tubular portion of the first rehabilitating pipe to an inner circumferential surface of the first existing pipe;
• providing a first flanged tubular member having a tubular part and a flange part extending from the tubular part;
• adhesively fixing the flange part of the first flanged tubular member to the inner circumferential surface of the second existing pipe so that the flange part covers the flange portion of the first rehabilitating pipe and the inner circumferential surface portion of the second existing pipe;
• inserting the tubular part of the first flanged tubular member into the first rehabilitating pipe and adhering the tubular part to the first rehabilitating pipe to thereby seal a gap between the inner circumferential surface of the first existing pipe and an outer circumferential surface of the first rehabilitating pipe;
• laying a second rehabilitating pipe inside the second existing pipe so that the second rehabilitating pipe crosses over the first existing pipe;
• forming a hole in the second rehabilitating pipe at a position thereof intersecting with the first existing pipe while the first flanged tubular member protects the first rehabilitating pipe from damage during formation of the hole;
• providing a second flanged tubular member having a tubular part and a flange part extending from the tubular part;
• bonding the flange part of the second flanged tubular member to an inner circumferential surface of the second rehabilitating pipe;
• and
• bonding the tubular part of the second flanged tubular member to an inner circumferential surface of the tubular part of the first flanged tubular member to thereby seal a gap between an inner circumference of the second existing pipe and an outer circumference of the second rehabilitating pipe.