JPH01273008A - Method of anchoring submarine cable in seaside manhole - Google Patents

Abstract

PURPOSE:To shorten the time for a cable laying ship to standby on the ocean by adopting the structure interposed with a tensile wire anchoring part between a submarine cable and a casing for connection and previously mounting this structure to the submarine cable. CONSTITUTION:Cable landing is executed in the state of previously mounting the tensile wire anchoring part 14 and the casing 11 for connection to the front end of the submarine cable 2 in this method. Namely, the part of the cable 2, excluding armoring iron wires 4, is first fixed by grasping the tensile wire in the anchoring part 14 and optical fibers are previously introduced into the casing 11. After the front ends of the iron wires 4 are radially spread, the front ends are sandwiched between a fixture 6 and fixtures 13 and 13' at the time of anchoring of this structure. The fixtures 13 and 13' are then screwed into the grooves 12 of the casing 11 and are tightened by stud bolts 8 and nuts 9 via a spacer 10 interposed therebetween and are fixed to the manhole wall. The time for the cable laying ship to standby on the ocean is thereby shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for anchoring a submarine cable in a manhole on a beach.

[Conventional technology]

The conventional submarine cable anchoring method in a beach manhole for optical submarine cables is as shown in Figures 3 (a) and (b).
The outer iron wire 4 of the submarine cable 2, which has been drawn into the manhole through the inside of the cable introduction tact 1, is wrapped around the binding wire 5 by bending it outward at certain points so as not to widen it radially, and then attaching it to the fixing bracket 6 in half. This method is to clamp it between fixing fittings 7 and 7' and fix it to the manhole wall 3.

To fix the fixing fittings 6, 7 and 7' to the manhole wall 3,
This is done by interposing the spacer 10 and using the embedded bolt 8 and nut. The part of the submarine cable 2 introduced into the manhole is an optical fiber protected by a tensile strength wire.
It is connected to the land cable within the connection housing 11.

[Problem to be solved by the invention]

In the above-mentioned conventional submarine cable mooring method in a manhole on the beach, the connection with the land cable is carried out after the submarine cable is moored, so after this series of operations, a confirmation test is completed between the land terminal station and the cable laying line. 10-1 until
It takes two hours, and the cable laying line has to wait at sea during that time, which is uneconomical. In addition, submarine cables are held in place only by the armored wire, and if the submarine cable is pulled by a ship's anchor after being laid, the armored wire will stretch and the light inside the submarine cable will be affected. Elongation occurs in the fiber, which often causes electrical and mechanical performance deterioration.

[Means to solve the problem]

The submarine cable anchoring method of the present invention includes a tensile strength wire anchoring section having a structure for fixing the end of the tensile strength wire in the submarine cable, and a housing for interconnecting the submarine cable and the land cable connected thereto. The step of guiding the attached end of the submarine cable into a manhole on the beach, fitting a half-split fixing fitting into hot water provided on the outer periphery of the housing body, and attaching and fixing the fixing fitting to the inner wall of the manhole. has.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIGS. 1(a) and 1(b) are a longitudinal sectional view and a front view of a first embodiment of the present invention. In this embodiment, cable landing is carried out with the tensile strength line anchoring section 14 and the connection housing 11 attached to the tip of the submarine cable 2 in advance. That is, the parts of the submarine cable 2 other than the armored iron wire 4 are fixed by clamping the tensile strength wire within the tensile strength wire retaining part 14 (for example, according to the structure shown in FIG. 2 of JP-A No. 6C1-249105 1), and connected thereto. The optical fiber is guided into the connecting housing 11. The armored iron wire 4 is fixed to the submarine cable 2 and the connection housing 11 with binding wires 5. The connecting plate 11 is provided with a groove 12 into which the semicircular notches of the half-split fixtures 13 and 13' are fitted. When fastening this structure, the tip of the armored iron wire 4 is held between the fixing fittings 6 and the fixing fittings 13 and 13' without being spread radially, and the fixing fittings 13 and 13' are connected to the connecting housing. 11 into the groove 12, with the spacer 1o interposed,
Tighten the embedded poles 1 to 8 and nuts 9 and fix it to the manhole wall 3.

FIGS. 2(a) and 2(b) are a longitudinal sectional view and a front view of a second embodiment of the present invention. This embodiment has a structure in which the armored iron wire of the submarine cable 2 is also held together with the tensile strength wire in the tensile strength wire retaining part 15 (for example, as shown in FIG.
structure) is used. Since the WI structure for fixing the exterior iron wire to the manhole wall 3 is not required, the fixing metal fittings 13 and 13', which are split in half and fit into the vortex 12 of the connection housing 11, are used.
is directly attached and fixed to the manhole wall 3 with an embedded bolt 8 and a nut.

〔Effect of the invention〕

As explained above, the present invention has a structure in which a tensile strength wire anchoring part is interposed between the submarine cable and the connection housing, and by attaching this to the submarine cable in advance, the connection time during landing work is reduced. In other words, it is possible to reduce the waiting time at sea for a cable-laying ship, and it is also effective in preventing the optical fiber from elongating by bearing the tension from the sea side with the tensile strength wire.

[Brief explanation of the drawing]

FIGS. 1(a) and 2(a) are longitudinal sectional views of the embodiments of the present invention, and FIGS. 1(b) and 2(b) are front views and FIGS. FIGS. 3(a) and 3(b) are a longitudinal cross-sectional view and a front view for explaining a conventional submarine cable anchoring method in a manhole. 1... Cable introduction duct, 2... Submarine cable,
3... Manhole wall, 4... Exterior iron wire, 5... Binding wire, 6.7.7', 13.13'... Fixing metal fittings,
8...embedded bolt, 9...nut, 1o...
On the other hand, 11... Connection housing, 12... Groove,
14.15... Tensile strength wire anchorage part.

Claims (1)

[Claims] An end portion of the submarine cable equipped with a tensile strength wire anchoring portion having a structure for fixing the end portion of the tensile strength wire within the submarine cable, and a shield body for interconnecting the submarine cable and land cable connected thereto. A beach manhole characterized by the step of guiding the body into a manhole on the beach, fitting a half-split fixing fitting into a groove provided on the outer periphery of the body, and attaching and fixing the fixing fitting to the inner wall of the manhole. Inland submarine cable retention method.