METHOD AND STRUCTURE FOR LAYING COMMUNICATION CABLE IN UNDERGROUND LINE, AND MEMBERS USED FOR LAYING

Title:

METHOD AND STRUCTURE FOR LAYING COMMUNICATION CABLE IN UNDERGROUND LINE, AND MEMBERS USED FOR LAYING

Document Type and Number:

WIPO Patent Application WO/2002/013345

Kind Code:

A1

Abstract:

A method of laying a communication cable (16) capable of laying an optical fiber cable (20) in an underground line such as a sewage line without applying a direct tension to the cable and without loosening the cable, capable of laying the optical fiber cables (20) on the upper side of the line for a main line allowing a plurality of optical fiber cables (20) to be laid therein, and eliminating the need for an expensive robot in the laying operation, comprising the steps of disposing highly strong and low extendable tension members (25, 26, 27) slidably in longitudinal direction of the optical fiber cables (20, 21, 22), pulling the tension members (25, 26, 27) into the underground line (1) by pulling, and applying a tension to a trunk tension member (25) between manholes (2) and (3) to stretch the trunk tension member (25) generally linearly in the underground line (1) so as to lay the optical fibers (20, 21, 22) on the upper side of the underground line (1), wherein a tension is applied to the branch tension members (26, 27) in branch pipes (4, 5) so as to prevent the branch optical fiber cables (21, 22) from being loosened in the branch pipes.

Inventors:

SETO ICHIRO (JP)
TSUCHIYA FUMIAKI (JP)
YAGI ISABURO (JP)
AZUMA KATSUHIKO (JP)
KISHIBE NOBUYASU (JP)
ASO KOJI (JP)
UEDA YASUHIRO (JP)

Application Number:

PCT/JP2001/006767

Publication Date:

February 14, 2002

Filing Date:

August 07, 2001

Export Citation:

Click for automatic bibliography generation Help

Assignee:

ASHIMORI IND CO LTD (JP)
SANKI ENG CO LTD (JP)
SETO ICHIRO (JP)
TSUCHIYA FUMIAKI (JP)
YAGI ISABURO (JP)
AZUMA KATSUHIKO (JP)
KISHIBE NOBUYASU (JP)
ASO KOJI (JP)
UEDA YASUHIRO (JP)

International Classes:

G02B6/50; H02G1/06; H02G1/08; H02G9/06; (IPC1-7): H02G1/06; H02G9/00; G02B6/00

Foreign References:

JPH11150822A	1999-06-02
JP2000104325A	2000-04-11
JPH11105134A	1999-04-20
JPS55106012A	1980-08-14
JPS55130539U	1980-09-16

Other References: