| 摘要 |
<p>PURPOSE: To provide an electric wire underground multipurpose duct excellent in sealing property in which positioning of a unit pipe body is facilitated, by inserting a bolt between the flanges of two unit pipe bodies to be coupled together, by forming an engaging part inside one frame body and coupling both fellow flanges together with the bolt. CONSTITUTION: An underground multipurpose duct for laying of electric wire is formed in such a manner that a plurality of unit pipe bodies 1a are intercoupled in the longitudinal direction, a frame body 2 formed of an unequal angle steel and a frame body 3 formed of an equal angle steel are arranged at the end faces on one side of the adjoining unit pipe bodies 1a and the portion between the two shape steels is formed of concrete structure part 6, and a frame-form engaging part 7 is formed at the end face of the frame body 3. When the unit pipe bodies 1a are intercoupled, the inner surface 2a of the frame body 2 is fitted in the engaging frame 7 fixed on the end face of the frame body 3 with a packing 20 being arranged on the engaging frame and a bolt 17 is inserted in flanges 10 opposite to each other and a nut 18 is joined in a screwed in state therewith for fastening. In which case, the packing 20 is nipped between the body surface parts of the frame body 3 and the engaging frame 7 and a portion between the unit pipe bodies 1 is reliably brought into a sealed state.</p> |
