| 摘要 |
<p>PURPOSE: To make it possible to obtain sealability and earthquake resistance for joint structure by adding vibration ability by providing a vibration shaft to a joint structure for coupling buried ducts made of metal pipes. CONSTITUTION: A vibration shaft 5 is provided in longitudinal direction for a joint structure 3; and buried ducts 2 coupled to the vibration shaft can be vibrated each other. Sealability of the side in the joint structure 3 is secured by pressure-contacting a pressure-welded portion 16 having a circular arc shaped convex section fixed to the outer side of a side face of an inner frame body 4 to a seal material 8 having a circular arc-shaped recessed seal fixed to the inner side of a side face of the outer frame body 7, and by keeping the same contact state between the pressure welded portion 16 and the sealing material 8 during the vibration of the buried duct 2. Also, the sealability of the upper surface and lower surface of the joint structure can be secured even by ordinary surface contact because the sealing material 8 only touches or slides the outer surface of the inner frame body 4 or the inner surface of the outer frame body 7. By doing this, the sealability and the earthquake resistance of the joint structure 3 can be secured.</p> |
