UNITED DUCT STRUCTURE FOR UNDERGROUND BURIED MATERIALS

摘要

PURPOSE: A united duct structure for underground buried materials is provided to bury an additional cable without performing an excavation work of a road and prevent a tangling phenomenon of the cable in a burying process of the additional cable. CONSTITUTION: A rectangular plate(3) is formed by a steel-reinforced concrete. A plurality of ducts(1) is formed to a longitudinal direction in an inside of the rectangular plate(3) of the steel-reinforced concrete. A plurality of stepped portions(7) is formed at both ends of the rectangular plate(3). The stepped portions(7) are used for supporting a connection portion between each end portion of the ducts(1) and each end portion of the opposite ducts. A plurality of nipples(11) is used for connecting the ducts(1) with the opposite ducts. The ducts(1) are formed by a metallic tube(5) for shielding an electric field and a metallic tube for shielding a magnetic field. A plurality of sealing portions(13) is inserted between both sides of the nipples(11) and end portions of the ducts(1).