Thermal insulation structure for pipe, pipe heating system, thermal insulation sheet, and method of installing thermal insulation structure

A thermal insulation sheet, which is configured to cover an outside of a heater while ensuring an air layer between the heater covering a pipe and the thermal insulation sheet, the thermal insulation sheet comprising:

• a first edge portion and a second edge portion located opposite to each other in a circumferential direction of the pipe;
• and
• a first fastening portion and a second fastening portion that are respectively provided at the first edge portion and the second edge portion, and are attachable to and detachable from each other.

A method of installing a thermal insulation structure, the method comprising:

• a first step of covering, with one or more thermal insulation sheets, an outside of a heater covering a pipe, and ensuring an air layer between the one or more thermal insulation sheets and the heater;
• and
• a second step of fixing a position of the one or more thermal insulation sheets through use of at least one fastening portion while ensuring the air layer.