PURPOSE: To easily perform the separate connection of an internal structure to a different body by winding up an inner covering layer, coupling respective inner areas, afterwards, winding up the periphery thereof on an outer covering layer, cutting out the inner structure in the lengthwise direction of a base area, pushing it into a box-shaped structure and connecting it suitable for the inner shape thereof with a tensioning device.

CONSTITUTION: While being stuck to a U-shaped channel 10 opened in a ceiling area, illumination and instruments and a shape determination insulator 12 in a corner area, an inner covering layer 8 is arranged with a metal rail 14 and a heating fabric 30 for floor heating and wall heating. The ruggedness on the surface thereof is made into plane by an insulating foam 15 and the surface is wound up by an outer covering layer 16. Next, a bore for air feed and an opening for illuminator are attached on the ceiling. Then, the internal structure is inserted into a box-shaped structure 18 after being cut in the lengthwise direction in the base area and the internal structure is moved in the direction of P2 and P3 and the direction of P4 and P5 by a tensioning device 24 expanded in the direction of P6. Finally, a separating gap 27 is closed.