Pipe structure, gasification combined cycle power generation device, and pipe structure assembly method

A pipe structure formed by connecting a plurality of pipe members that allow a fluid containing a solid to flow therein, the pipe member comprising:

• a tubular outer pipe;
• a liner structure that is disposed inside the outer pipe;
• a first liner holding member that is provided on one end side of the outer pipe and holds one end of the liner structure in a state where the liner is restrained in a pipe axis direction and a circumferential direction around a pipe axis;
• and
• a second liner holding member that is provided on the other end side of the outer pipe and holds the other end of the liner structure in a state where the liner structure is slidable in the pipe axis direction and is restrained in the circumferential direction, the second liner holding member being formed in an annular shape, wherein
• a gap along the pipe axis direction is formed between an end portion of the liner structure included in a second pipe member among the plurality of pipe members and an end surface of the outer pipe included in a first pipe member among the plurality of pipe members in a state where one end of the first pipe member and one end of the second pipe member facing each other, the first liner holding member being provided on one end of the first pipe member, the second liner holding member being provided on one end of the second pipe member, and
• the second liner holding member included in the second pipe member is disposed on an outer peripheral side of the gap in a state where the second liner holding member contacts with an inner peripheral surface of the outer pipe included in the second pipe member.