公开(公告)号：JPH08136777A

公开(公告)日：1996-05-31

申请号：JP24783994

申请日：1994-10-13

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIYOU EISHIYAKU ,  YANAGI SHIYOUGEN ,  HAKU SHIYOUKUN

IPC: G02B6/35 ,  G02B6/00 ,  G02B6/44 ,  H02G1/06 ,  H02G9/10

Abstract: PURPOSE: To prevent the motion of an inner pipe in a duct formed inside a manhole, and further prevent the repeated expansion and contraction of the inner pipe due to a temperature change, and the occurrence of the phenomenon of the inner pipe being drawn into the outer pipe from the internal space of the manhole by providing a motion preventing means for preventing the motion of the inner pipe, and a pipe plug fixing device for preventing the separation from the outer pipe. CONSTITUTION: The joint of a base plate 9 and an inner pipe frame 8 can be tightened with a joint member, or the base plate 9 and the inner pipe frame 8 can be integrated with each other. Also, a preventive part is provided on one opposite end of the inner pipe frame 8 with the base plate 9 jointed. Also, the base plate 9 and a pipe plug 1 are jointed to each other by coupling a fixing nut 12 to a set bolt 2. In this case, when the fixing nut 12 coupled to the set bolt 2 is made to firmly adhere thereto, a water stop rubber 6 at the center of the pipe plug 1 radially expands, and the pipe plug 1 internally adheres to an outer pipe in a radial direction. thereby preventing the separation of the pipe plug 1 from the outer pipe.