Precast segment for wind turbine tower and method for building a wind turbine tower using said precast segment

A precast segment for wind turbine tower which comprises at least one joint flange configured to establish a boundary to the formation of at least one joint between said precast segment and an adjacent precast segment, where the joint is to be filled with filler material, wherein the precast segment comprises at least one conduit and:

• the conduit comprises one inlet and one outlet,
• the conduit is located in the vicinity of the at least one joint flange of the precast segment, and
• the conduit has a cross section of a similar shape and size to that of the cross section of a heating cable so as to house the heating cable;
• and wherein the longitudinal direction of the conduits is parallel to the joint flange of the precast segment and the conduits are built with the same curvature as the precast segment and with a radial portion at its ends designed to facilitate the introduction of the heating cable in the conduit through the inlet hole, and the radial portion of the conduits comprises an elbow joint having a curvature large enough to facilitate the insertion and removal of the heating cable.