| 摘要 |
<p>PURPOSE: To easily and surely construct the cable passing section on a wall in which cables laid on a floor are passed through a through hole at the lowest position of a partition wall in a fire protection structure. CONSTITUTION: A wiring pit 1 is provided on the upper surface of a floor 2 and a cable group 5 is arranged along the bottom la of the pit 1a. The group 5 is passed through a through hole 4 demarcated by the lower surface of a hollow partition wall 3 and the pit 1. The opening of the hollow section 3a of the wall 3 is closed by partitioning the internal space of the hole 4 by arranging a steel frame body 6 so as to surround the upper surface and both side faces of the group 5. Then the group 5 and the body 6 are thermally insulated from another by forming a fire protective filled section 7 by filling up the gap between the group 5 and body 6 with a fire protective sealing material and, at the same time, the passage of flame and smoke is blocked by forming fire protective shielding sections 8 and 9 by filling up both openings with the sealing material. The amount of the fire protective material is rationalized while securing the fire protecting abilities of the sections 7 and 8 by deciding the size of the body 6 so that the gap between the group 5 and body 6 can become a prescribed size. Finally, the adhesion between the sealing material and group 5 is improved by pressing down the body 6 by utilizing the weight of the body 6 or an independent pressing means.</p> |
