A line conduit (10) to be cast into a structural element (12), especially a floor/ceiling and/or wall made of concrete, including an elongated housing (18) that has a holding space (25) for at least one line (16). The space is continuous in the lengthwise direction (L), and includes a fire-protection element (26) made of an intumescent material that is arranged around the inner wall of the housing (18) in the circumferential direction, whereby at least one anchoring element (34) is provided on the inner wall of the housing (18), the element being anchored inside the fire-protection element (26).