JP2001258141A - Protective tube for submarine cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective tube for a submarine cable capable of preventing a corrosion and improving operability. SOLUTION: The protective tube A covers the submarine cable K by connecting a tube body 1 to a tube cover 2 to one another. In this case, the body 1 and the cover 2 are molded of a synthetic resin. Half-split grooves 5, 19 to be inserted with the cable K are provided in coincidence with connecting surfaces. Engaging protrusions 8, 21 and engaging recesses 9, 22 capable of bendably communicating with the tube A are provided at both ends. Vent holes 11, 14 for communicating with one another are opened at superposed sites of both sidewalls 1b, 2b of the body 1 and the cover 2. Further, the body 1 and the cover 2 are molded in cavity states opened at 4, 18 at surfaces opposed to connecting surfaces. Reinforcing bars 12, 25 are arranged in the cavities 3, 17 via the openings 4, 18 and filled with a cement S. Then, the body 1 can be integrally connected to the cover 2 by hitting connecting pin 30 to the holes 11, 24 communicating with one another.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submarine cable protection tube to be attached to a submarine cable laid on the seabed.

[0002]

2. Description of the Related Art Conventionally, for example, when laying a submarine cable from an island to an island, it is good in a place where the water depth is deep. Because there is a risk of damage and an accident, multiple sub-tubes are attached to the submarine cable in the vicinity.

[0003] The protective tube comprises a semi-cylindrical tube body and a tube cover, which are formed by casting.
Then, the pipe main body and the pipe lid are attached to the submarine cable from both sides thereof, and the pipe main body and the pipe lid are integrally joined with a plurality of bolts and nuts, and the same operation is sequentially repeated to obtain a predetermined shape for the submarine cable. The protective tube is continuously attached over the length of.

[0004]

However, since the protective tube is formed by casting, it is liable to be corroded by seawater and has a short service life, and the pipe body and the pipe cover are joined by bolts and nuts. As a result, much work and time were required for tightening, and workability was extremely poor. Moreover, since the protective tube was formed in a cylindrical shape, it was easy to move by the tide, which caused tension on the submarine cable, which was not preferable. In view of the above, the present invention has been made to solve the above-mentioned problems, and a submarine cable protection tube which is hardly corroded by seawater, can withstand long-term use, improves workability, and is not affected by tide flow. It is intended to provide.

[0005]

In order to achieve the above object, a protective tube for a submarine cable according to the present invention is a protective tube in which a pipe main body and a pipe cover are joined to each other and attached to a submarine cable. The pipe main body and the pipe lid are formed of synthetic resin, and are provided with half-shaped concave grooves through which the submarine cable is inserted so as to match the joint surfaces of the pipe main body and the pipe cover, and both ends are respectively protected. A fitting convex portion and a fitting concave portion capable of freely communicating the pipe are provided, and a through-hole communicating with each other is formed in an overlapping portion of both side walls of the pipe main body and the pipe lid body. The pipe cover and the pipe cover are formed in a cavity shape having an opening on the surface facing the joint surface, a reinforcing bar is provided inside each cavity through these openings, and cement is filled therein. By driving a connecting pin into the hole, the pipe body and pipe lid can be joined together. It was formed. In this way, the cavity is made of synthetic resin and the cavity is filled with cement to prevent corrosion due to seawater, and the pipe body and pipe lid can be joined only by driving the connecting pin, making work easy and quick. Now you can do it. Moreover, it is excellent in strength and stable.

Further, it is preferable that a cross-sectional shape orthogonal to an insertion hole formed by a concave groove which is formed by joining the pipe main body and the pipe cover body to each other is formed into a polygon which is hard to rotate on the bottom of the sea floor. As the polygon, any one of a triangle, a quadrangle, and a pentagon is selected. As a result, the submarine cable is hardly affected by the tide flow, and no unnecessary tension is applied.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a submarine cable protection tube according to an embodiment of the present invention. FIG. 1 is an exploded perspective view of the protection tube. The protection tube A includes a tube main body 1 and a tube cover 2 joined so as to cover the tube main body 1. As shown in FIGS. 2 to 4, the pipe main body 1 is formed in a vertically elongated substantially rectangular parallelepiped shape by a synthetic resin and is formed in a hollow shape, and a rectangular opening 4 connected to the hollow interior 3 is opened in the bottom wall 1a. I have. As shown in FIG. 1, a half-shaped concave groove 5 for inserting a submarine cable K, which will be described later, is provided along the longitudinal direction on the upper surface which is a joining surface. Notch recesses 6 and 6 are formed in the upper halves of both ends of both side walls 1b and 1b in the longitudinal direction. A fitting projection 8 and a fitting recess 9 having a connection groove 7 connected to the recess 5 are formed below the notches 6 and 6. Provided.
A recess 10 is formed at the center of the upper end edge of the side walls 1b, 1b, and a through hole 11 which is located at the upper end of the side walls 1b, 1b and is opposed to each other on both sides in the longitudinal direction and can communicate with each other. , 11 have been established.

In FIG. 2, reference numeral 12 denotes a reinforcing bar disposed inside the cavity 3 of the tube body 1, a plurality of side gate-shaped bone bars 13 are arranged at equal intervals, and three supporting bars are provided on these bars. 14
Framed by welding. Then, as shown in FIG. 3, the pipe body 1 is turned upside down and the opening 4 in the bottom wall 1a is opened.
The reinforcing bar 12 is disposed in the cavity interior 3 via a hole. At this time, the reinforcing bar 12 does not protrude outward from the bottom wall 1a surface. Then, in this state, as shown in FIG.
The cement S is filled until the surface becomes the same as the upper surface, and curing is performed for a predetermined time.

Next, as shown in FIGS. 5 to 7, the pipe cover 2 is formed of a synthetic resin, and
Is formed in a substantially vertical plate-like shape having a size to cover the upper surface of the cavity, and is formed in a cavity shape, and a rectangular opening 18 connected to the cavity interior 17 is opened in the top wall 2a. As shown in the drawing, a half-shaped concave groove 19 for inserting the submarine cable K is provided along the longitudinal direction on the lower surface which is the joint surface. Also,
Connecting groove 20 connected to concave groove 19 at both ends along the longitudinal direction
And a fitting projection 21 and a fitting recess 22 that cover the fitting projections 8 and the fitting recesses 9 of the tube body 1 are provided. The lateral width of both side walls 2b, 2b between the fitting convex portion 21 and the fitting concave portion 22 is formed so as to fit into the concave groove 5 of the tube main body 1, and the pipe is provided substantially at the center of the outer surface of the both side walls 2b, 2b. Body 1
Projecting ridges 23 are fitted to each of the concave portions 10 to protrude. Further, through holes 24, 2 which are upper end portions of both side walls 2b, 2b and which can communicate with each other on both sides in the longitudinal direction so as to be opposed to each other.
4 have been established. These through holes 24 communicate with the respective through holes 11 of the tube body 1.

In FIG. 5, reference numeral 25 designates a reinforcing bar disposed inside the cavity 17 of the tube cap 2, and a plurality of side gate-shaped bone bars 26 are arranged at regular intervals in the same manner as described above. It is framed by welding three struts 27. Then, as shown in FIG. 6, the reinforcing bar 25 is disposed in the cavity 17 through the upper surface opening 18 of the tube cover 2, and is further inserted between the through holes 24 of the side walls 2b, 2b. The pin 28 is driven as described above. These pins 28 are connected to the tube cover 2
This is for temporarily inserting the cement S layer to be filled into the cement S layer so that the communicating hole 29 communicating with the through hole 24 is also provided. Then, it is removed after molding.
Next, in this state, as shown in FIG. 7, the cavity S 17 is filled with cement S through the opening 18 until the upper surface is flush with the upper surface of the ceiling wall 2a, and curing is performed for a predetermined time. After the curing is completed, the pins 28 are inserted into the through holes 24.
Remove from In this case, it is preferable that the tip of the pin 28 inserted into each through hole 24 protrudes outward from the through hole 24. In this way, as shown in FIG. 1, the pipe main body 1 and the pipe cover 2 are completed.

Next, a method of attaching the protective tube A having the above structure to the submarine cable K will be described. In FIG. 8, K denotes a submarine cable. First, the pipe body 1 is disposed below the submarine cable K, the submarine cable K is inserted into the concave groove 5, and the submarine cable K is further inserted into the concave groove 19 from above. Then, the pipe cover 2 is joined to the upper surface of the pipe main body 1, and the connecting pin 30 is inserted into each of the communicating holes 11, 24. Thereby, as shown in FIG. 9 and FIG.
Are integrally formed, and an insertion hole 31 formed in the protection tube A by the double concave grooves 5 and 19 and through which the submarine cable K is inserted is provided. The outer peripheral surface of the protection tube A, that is, the insertion hole 3
The cross-sectional shape orthogonal to 1 is substantially square. In this manner, the same operation is repeated so that the adjacent protection tubes A and A come close to each other so that the fitting recesses 9 and 22 on the rear side of one protection tube A and the fitting projections 8 and 21 on the front side of the other protection tube A. Are connected to each other, as shown in FIG. Since the fitting projections 8 and 21 and the fitting recesses 9 and 22 are in sliding contact with each other in a hemispherical shape, the protection pipes A and A become freely bendable around this portion, so that the topography on the seabed B can be easily controlled. Can be matched. The protection tube A, that is, the insertion hole 3
Since 1 is formed by the wall of the synthetic resin, the inner peripheral surface becomes smooth, and the occurrence of scratches on the surface due to the displacement of the submarine cable K can be prevented.

As described above, the protection tube A is provided with the through holes 11 and 24.
Since the pipe main body 1 and the pipe cover 2 can be integrally joined only by driving the connecting pin 30 into the seam, the work of attaching to the submarine cable K becomes easy, and the work can be performed quickly without much labor and time. . Further, the cross-sectional shape orthogonal to the insertion hole 31 of the protection tube A is made to be a quadrangle so that it is difficult to rotate on the bottom of the seabed B. However, other shapes that satisfy this condition may be formed into a triangle or a pentagon. Of course.

[0013]

The protective tube for a submarine cable according to the present invention comprises:
The above configuration has the following effects. The pipe body is made of synthetic resin, and rebars are placed inside the cavity and filled with cement, so corrosion by seawater is prevented and long-term use is possible. Since the pipe body is joined and assembled, the work can be performed easily and quickly, and the work efficiency is improved, and the safety is also enhanced. Furthermore, it is excellent in strength and robust, and is extremely stable. Since the cross-sectional shape orthogonal to the insertion hole of the protection tube is formed in a polygon that is difficult to rotate on the bottom of the sea floor, it is hardly affected even in a place where the tide flows strongly, and the submarine cable does not needlessly move. As a result, it is possible to prevent a submarine cable disconnection accident or the like.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a protection tube.

FIG. 2 is a perspective view showing a method for forming a pipe main body.

FIG. 3 is a perspective view showing a method of forming a pipe main body.

FIG. 4 is a perspective view showing a method for forming a pipe main body.

FIG. 5 is a perspective view showing a method of forming the tube cover.

FIG. 6 is a perspective view showing a method of forming the tube cover.

FIG. 7 is a perspective view showing a method of forming the tube cover.

FIG. 8 is a perspective view showing a state where a protection tube is attached to a submarine cable.

FIG. 9 is a longitudinal sectional view of the same.

FIG. 10 is a transverse sectional view of the same.

FIG. 11 is a use state diagram in which a number of protective tubes are attached to a submarine cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe main body 1b Side wall 2 Pipe lid 2b Side wall 3 Cavity part 4 Opening 8 Fitting convex part 9 Fitting concave part 11 Through hole 12 Reinforcing bar 17 Empty part 18 Opening 21 Fitting convex part 22 Fitting concave part 24 Through hole 25 Reinforcing bar 30 Connecting pin A Protection tube K Submarine cable S Cement

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazunori Moromi 3-2-16-1 Ginowan, Ginowan City, Okinawa Prefecture Inside Hikari Minami Construction Co., Ltd. (72) Inventor Yoshinori Majojo Tomari 3, Naha City, Okinawa Prefecture 8-8 chome 1 (72) Inventor Mitsuhide Nakamura 29F term of 838 Maezu, Chikugo City, Fukuoka Prefecture (reference) 3H024 AA04 AB02 AC03 5G369 AA06 BA02 BB02 DA02

Claims (2)

[Claims] 1. A protective tube in which a pipe main body and a pipe lid are joined to each other so as to be attached to a submarine cable, wherein the pipe main body and the pipe lid are formed of a synthetic resin, and each other. A half-shaped concave groove is provided in which the submarine cable is inserted in conformity with the joint surface, and a fitting convex portion and a fitting concave portion are provided at both ends of the protective tube so that the protective tube can be freely connected to the protective tube. Through holes communicating with each other are opened in the overlapping portions of both side walls of the main body and the pipe lid, and further, the pipe main body and the pipe lid are formed in a hollow shape in which a surface facing a joint surface is opened, A reinforcing bar is arranged inside each cavity through these openings and is filled with cement, and a connecting pin is inserted into each communicating hole so that the pipe body and the pipe cover can be integrally joined. A protective tube for a submarine cable, characterized in that: 2. The seabed according to claim 1, wherein a cross-sectional shape orthogonal to an insertion hole formed by a concave groove that is formed by joining the pipe body and the pipe cover body is formed into a polygon that is difficult to rotate on the bottom of the seabed. Protection tube for cable.