Patent ID: 8545656

Claim:
A method for manufacturing a resin pipe, comprising: winding a first sheet member spirally around a curved portion of a bar multiple times until a desired thickness is reached; holding the first sheet member by welding ends of the sheet member; winding a second sheet member around a linear portion of the bar to define a predetermined thickness on the linear portion of said bar; heating the first and second sheet members, wherein the first and second sheet members are melted and molded into a resin pipe by the heating, removing the bar from the resin pipe after the heating, and wherein the bar is made of a water-soluble material withstanding the heating, the bar is dissolved in water so as to be removed from the resin pipe after the heating, wherein the heating is performed, after heat-resistant film is wound on an outer peripheral surface of the first sheet member, and wherein heat-resistant film is wound on the outer peripheral surface of the first sheet member for each heating, and the heating is performed two or more times.