Construction method of information-capable conduit, and construction structure and construction member therefor

The object is to provide a construction method of an information-capable conduit whereby communication cables can be readily laid in an underground conduit having a main conduit and branch conduits branched therefrom thereby allowing the underground conduit to be used as an information-capable conduit, and to provide a construction structure and a construction member therefor. The construction method of an information-capable conduit comprises inserting a sheath pipe (1) into an underground conduit (17, 7) through a manhole (9, 10), the sheath pipe having a main body (3) formed with a space (2) for installing a communication cable (6) thereinto and a high-strength low-elongation material body (4) integrally formed in the main body (3) along the length of the main body (3), and securing the high-strength low-elongation material body (4) onto the inner wall of said manhole (9, 10) by applying tension thereon to secure the sheath pipe (1) in the substantially upper part inside the underground conduit (17, 7).