JP2594273Y2 - Protective tube for underwater long body - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection pipe for an underwater elongate body for protecting an elongate underwater elongate body such as a submarine cable, for example.

[0002]

2. Description of the Related Art Conventionally, when the seabed on which a submarine cable is laid is a rocky place, it has been practiced to cover a two-piece cast iron protective tube to prevent abrasion and damage of the submarine cable. As shown in FIGS. 5 and 6, a conventional protective tube 1 of this type has two substantially rectangular connecting portions 2 and 3 formed at both ends in a longitudinal direction and flange portions 4 formed at left and right side edges. The semi-cylindrical members 5, 6 are joined to each other by bolts 7 at the flange portion 4, and the bolt joint portions 1
6, a bolt 7 is passed through a bolt insertion hole 4a formed in the flange portion 4, a washer 8 is inserted into the bolt 7, a nut 9 is screwed and tightened, and the two flange portions 4 are joined to each other as shown in FIG. It was a structure.

[0003]

When the conventional protective tube 1 is attached to the submarine cable A, the washer 8 and the nut 9 are carried to the seabed with the nuts 9 removed from the bolts 7, and the bolts 7 are mounted on the seabed.
Is passed through the bolt insertion hole 4a of the flange portion 4, the washer 8 is inserted into the bolt 7, and the nut 9 is screwed and tightened. However, such an operation is complicated, and the
And the nut 9 is often lost. In addition, since the bolt 7 rotates when the nut 9 is tightened, two spanners, a wrench for bolt head and a wrench for tightening the nut, are required, and the diver must be able to dive to the seabed with two wrench. In this respect, workability was also difficult.

The present invention has been made in order to solve the above-mentioned conventional drawbacks. There is no risk of loss of washers and nuts, and the rotation of bolts can be prevented, so that only one spanner is required. It is an object of the present invention to provide a protective pipe for a long-water body that can efficiently perform work in water.

[0005]

According to the present invention, two substantially semi-cylindrical bodies having connecting portions formed at both ends in a longitudinal direction and flange portions formed at left and right side edges are bolted with the flange portions. A two-piece protective tube for an underwater long body joined to each other by means of :
Also have approximately U-shaped notches on the left and right flanges,
Only one flange has a recess for locking the bolt.
And two substantially semi-cylindrical bodies of the same shape
Turn it upside down and combine to form a tube,
The U-shaped notch on the upper and lower flanges
With its head in the recess for locking the bolt
Insert the nut from the side, screw the nut into this bolt and tighten.
It is characterized in that the two substantially semi-cylindrical bodies are joined together .

[0006]

The protective pipe having the above construction is placed on the long bottom body laid on the bottom of the water, and each half semi-cylindrical body is put on the long bottom body so as to be sandwiched from both sides, and the flange portions are overlapped with each other. Next, a bolt to which a washer and a nut are attached in advance is inserted into the U-shaped notch of the flange from the lateral direction, and then the nut is tightened. Attachment to an underwater long body is performed. In this case, since the bolt is prevented from rotating by the bolt rotation preventing concave portion of the flange portion, a wrench may be hung only on the nut side.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In FIG. 1 to FIG. 4, reference numeral 11 denotes a protection pipe for a submarine cable according to an embodiment of the present invention. This protective tube 11 has spherical connecting portions 12 and 13 formed at both ends in the longitudinal direction, and flange portions 14 and 15 formed at left and right side edges.
It consists of two substantially semi-cylindrical bodies 16,17. The one connecting portion 13 has a small diameter, the other connecting portion 12 has a large diameter,
As shown by a two-dot chain line in FIG. 2, the adjacent protection pipes 11 can be slightly angled in such a manner that the small-diameter connection portion 13 is accommodated in the large-diameter connection portion 12, that is, the adjacent protection tubes 11 are protected. The tubes 11, 11 can bend each other following the bending of the cable.

The two substantially semi-cylindrical bodies 16 and 17 are of the same shape and are used by simply inverting one of them.
Each of the substantially semi-cylindrical bodies 16 and 17 has a flange portion 14 on one side thereof.
Bolt connection 18 on the nut side and flange 15 on the other side
A bolt joint 19 on the bolt head side is formed in each of the bolt joints, and a U-shaped notch 22 for inserting a bolt 21 from a lateral direction is formed in each of the bolt joints 18, 19. Further, a concave portion 19a for preventing the bolt from rotating is formed in the bolt joint portion 19 on the bolt head side, and the bolt joint portion 1 on the nut side is formed.
8 has a small projection 18a for preventing the nut 23 and the washer 24 from coming off sideways. Therefore, the bolts 21 are mounted upside down on the left and right as shown in FIG. The reference numeral 25 indicates a reinforcing rib.

A description will be given of the operation of attaching the above-mentioned protective tube 11 so that the diver covers the submarine cable A. The bolt 21 is attached to the seabed in advance with a washer 24 inserted on land and a nut 23 screwed to the tip. Carry. On the seabed, each half semi-cylindrical body 16, 17 is placed so as to sandwich it from above and below both sides of the seabed cable A, and the flanges 14, 15 are overlapped with each other. 21 is inserted into the U-shaped cutouts 22 of the bolt joints 18 and 19 of the flanges 14 and 15 from the lateral direction, and then the nut 23 is tightened with a spanner.
5 are joined together by bolts 21 and the protective tube 11
Is attached to the submarine cable A. In this case, the bolt 21 is connected to the bolt joint 19 on the bolt head side.
Since the rotation is prevented by the recess 19a for preventing the rotation of the bolt, a spanner may be hung only on the nut 23 side and tightened.

The U-shaped cutouts 22 provided in the flange portions 14 and 15 are not limited to the case where the bolted portions 18 and 19 are specially formed in thick portions as in the embodiment. A U-shaped notch may be formed directly in the flange. It is also conceivable that the flange is not formed over the entire length of the substantially semi-cylindrical body, but is formed only at the bolted joint. The protection pipe of the present invention
It goes without saying that the present invention can be applied to not only a submarine cable but also a long body installed on the water floor.

[0011]

According to the present invention, a U-shaped notch is formed in the flange portion of each substantially semi-cylindrical body of the two-piece protective tube, and a bolt is inserted into the U-shaped notch from the lateral direction so that two substantially half holes are formed. In this configuration , the flanges of the cylindrical body are joined to each other.
From, it is possible to be attached in advance bolt washer and nut on land, thereby working in the sea bed is significantly simplified, also, no longer a risk of loss, such as washers and nuts. In addition, since the flange is provided with a recess for preventing the rotation of the bolt, only one spanner is required for tightening the nut, and the diver does not need to have an extra tool. As a result, work on the bottom of the water has become extremely efficient, for example, the installation time has been halved. And
Two substantially semi-cylindrical bodies have the same shape, and the two are turned upside down.
If combined, a protective tube that produces the above-mentioned effects will
Therefore, in order to obtain the above-mentioned effects, 2
There is no need for any kind of semi-cylindrical body,
The work is not complicated.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a bolt of a protection pipe for a long water bottom body according to an embodiment of the present invention is removed.

FIG. 2 is a front view showing a state in which the protective tube is attached so as to cover a submarine cable.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is a front view showing a conventional protection pipe for a submarine cable.

6 is a sectional view taken along line BB in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Protective tube 12, 13 Connection part 14, 15 Flange part 16, 17 Approximately semi-cylindrical body 18 Nut side bolt joint part 19 Bolt head side bolt joint part 19a Concave part for bolt detent 21 Bolt 22 U-shaped notch 23 nut 24 washer

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tamotsu Iwata 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Kyosho No. 1 1-1-1, Kiba, Koto-ku, Tokyo Co., Ltd. Inside Fujikura (72) Inventor Seiichi Fushimi 1-2-2 Monzennakacho, Koto-ku, Tokyo Inside Arii Seisakusho (72) Inventor Toshikuni Kitamura 1-2-2 Monzennakacho, Koto-ku, Tokyo Arii Co., Ltd. (56) References JP-A-63-303296 (JP, A) JP-A-50-155598 (JP, U) JP-A-4-61423 (JP, U) JP-A-4-93433 (JP, U) ) Actually open 1987-18828 (JP, U) Actually open 1983-22036 (JP, U) Actually open, 4-58040 (JP, U) Actually open, 5-55994 (JP, U) 47512 (JP, Y2) JP, Y2) Jiko 53-29888 (JP, Y2) Joji 46-17584 (JP, Y1) Jiko 48-36633 (JP, Y1) Jiko 50-5997 (JP, Y1) (58 ) Surveyed field (Int.Cl. ⁶ , DB name) H02G 9/00-9/12

Claims (1)

(57) [Scope of request for utility model registration] 1. A two-piece semi-cylindrical body having connecting portions formed at both ends in the length direction and flange portions formed at left and right side edges, and which is joined to each other by bolts at the flange portions. And the two substantially semi-cylindrical bodies are attached to the left and right flanges.
Has a substantially U-shaped notch, only one of the flanges
It has the same shape with a recess for locking the bolt.
Combine two semi-cylindrical bodies of the same shape by turning them upside down
Upper and lower flanges that are formed into a tube and overlapped
In the U-shaped cutout of the part, the head is
Insert it from the side in a posture to enter the detent for rotation.
Screw the nut to the bolt and tighten the two semi-cylindrical bodies
A protective tube for a long underwater body characterized by being joined .