JPS59755B2 - Long body seabed installation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for laying a long body on the seabed, such as a submarine cable or a water pipe, from a laying ship to the seabed.

When installing a long body on the seabed, in areas where rocks, etc. are exposed on the seabed, protect the long body with a protective body to prevent it from being damaged by being rubbed against rocks, etc. by external forces such as tidal currents. There is a need.

In such cases, conventionally, a diver dives and attaches a protective body to a long body on the seabed, which has the drawback of extremely low efficiency in protective work.

Another drawback was that it was difficult to protect the Diper in areas where the seabed was too deep or the currents were too strong to allow it to dive.

An object of the present invention is to be able to efficiently protect a long body on a laying ship, reduce the load on the long body even if the body is a long body with protection, and reduce the bending required for the long body with protection. An object of the present invention is to provide a method for laying a long body on the seabed, which allows the laying work to be carried out while giving the same conditions.

The method for laying a long body on the seabed of the present invention includes: a protection body having a connector fitting locking hole at the rear end; and a base supported by the protection body with the distal end protruding from the front part of the protection body. A plurality of two-part protective bodies each consisting of a plug-in connector made of rubber elastic material are attached to the outer periphery of the elongated body on the installation ship, and the front and rear protective bodies are installed at the front with a space between them. By inserting the tips of the plug-in connectors of the latter protection body into the connector fitting locking holes of the protection body, the elongated bodies are mutually connected and protected, and this elongated body with protection is connected to the This system is characterized in that the cable is laid while being guided to the seabed through a long guide tube that hangs down from the laying ship at an angle to the seabed.

In this way, the plug-in type is made of a protective body having a connector fitting locking hole at the rear end, and a rubber elastic body whose front part projects from the tip of the protective body and whose rear part is supported by the protective body. If the protection work is carried out on the laying ship using a plurality of halves of the protectors each consisting of a connector, the work of attaching the protectors can be easily carried out even while the elongated bodies are being fed out.

In addition, since the long body with protection is guided to the seabed through the long body guide pipe, the load of the protective body can be shared between the long body and the long body guide pipe, so the protection can be carried out onboard the laying ship. Even if it is applied, the installation work can be carried out safely without applying a large load to the long body.

At this time, the long body with protection is connected with a plug-in connector made of rubber elastic material with a space between the protection bodies, so it can be bent to the required curvature using this space and rubber elasticity. The long body with protection can be prevented from being damaged by its own weight while descending.

It is still possible to economically protect only the sections that require protection, if necessary.

Furthermore, protection work can be carried out without any trouble even in the absence of a diver or even in sea areas where the current is so strong that a dipper cannot dive.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 and 2 show an example of a protector 1 used to protect a long body in this embodiment.

This protection body 1 has a cylindrical protection body 2 made of reinforced concrete, and this protection body 2 is provided with a long body through hole 3 in the front and back direction.
A dividing surface 4 is provided that traverses the entire length of the housing, dividing it into two upper and lower halves 2A and 2B.

These half bodies 2At and 2B are interconnected and integrated using a connecting tool which will be described later.

At the front of the protective body 2, a plug-in connector 6 made of a rubber elastic body having an elongated through hole 5 communicates the through hole 5 with the through hole 3 of the protective body 2, and its base is connected to the protective body 2. It is embedded in the front part of the protection body 2, and is fixed with its tip side protruding a required length in front of the protection body 2.

This connector 6 is also divided into upper and lower parts 6A and 6B by providing a split surface 7 in the same part as the protective body 2, and as described above, each base is attached to each half of the protective body 2.
It is embedded and fixed in At2B.

Such a connector 6 is made of a material having rubber elasticity, such as rubber or plastic, and has protrusions on its outer surface to ensure good locking.

A connector fitting locking hole 8 is provided at the rear of the protection body 2 so as to communicate with the elongated body through hole 3, and this hole 8 is also divided into upper and lower halves by the dividing surface 4 of the protection body 2.

Figures 3 and 4 show a half-split body 2A that constitutes the protective body 2.
, 2B is shown.

This connector 9 has a female member 10 embedded in the lower surface of one half 9 body 2A, and a dovetail groove 1 in the lower surface of this member 10.
1 is provided in this dovetail groove 11 from the upper surface.
2 protrudes downward.

A male member 13 made of a rubber elastic body whose lower part is embedded in the half body 2B projects from the upper surface of the other half body 2B.

A notch 14 is formed in the upper part of this male member 13 into which the guard portion 12 is inserted.

In such a connecting tool 9, when the male member 13 is fitted into the dovetail groove 11 of the female member 10, the servant portion 12 of the female member 10 is pushed into the notch 14 of the male member 13, and the tip of the male member 13 is doubled. The two halves 2A and 2B are then pushed open and locked into the dovetail groove 11 of the female member 10 to connect the halves 2A and 2B.

Figure 5 shows a long body 15 of the protective body 1 shown in Figures 1 and 2.
Indicates the protected state.

In this case, the protective body 1 is installed by sandwiching the two halves 2A and 2B to the elongated body 15 so that the elongated body 15 is inserted into the through holes 3 and 5, and connecting them with the connector 9.

Attach the rear protector 1 in the same manner, and fit the tip of the plug-in connector 6 of the rear protector 2 into the connector fitting locking hole 8 at the rear of the front protector 2 to connect the front and rear protectors. The protectors 1 are respectively locked and connected.

In this case, there is a plug-in connector 6 between the front and rear protection bodies 2.
The protected elongated body 15, that is, the elongated body with protection, makes a gap d between the stepped portions of , and the protected elongated body 15 makes this gap d and the rubber elasticity of the plug-in connector 6, and the protected elongated body 15 makes this gap d. This allows the bending radius to be within the allowable bending radius.

FIG. 6 and FIG. 1 show an example of the laying method of the present invention.

Sections that do not need to be protected by protection body 1 are covered by laying ship 16.
Using a foldable elongate body guide tube 18 that is inclined and suspended down to the seabed 17, the elongate body 15 is inserted into this guide tube 18.
The cable will be unwound to the seabed 17 through the cable, and the cable will be laid.

In this case, a heavy weight rudder 19 having a long body through hole is connected to the lower end of the elongated body guide tube 18 so that the lower end of the guide tube 18 can pass through a predetermined route without being washed away by tidal currents. Tebru.

Further, a caterpillar type brake 20 is mounted on the laying ship 16, and the elongated body 15 is fed out while applying tension so as not to hang down unnecessarily.

The foldable elongated body guide tube 18 forms a ring with a horizontal arm 18a, and connects a vertical arm 18b with a pivot 18c in a link type, so that it can be folded and stored on a ship when not in use. There is.

Next, when the protected seabed 17A that requires protection of the elongated body 15 approaches, such as an exposed rock section, this protected seabed 17A
(The distance must be slightly longer than the depth of the sea area.)

), the elongated body 15 is protected by attaching two halves of the protective body 1 as shown in FIGS. Take it out into the sea through 18.

In this way, the elongated body 15 installed on the seabed 17A requiring protection will be continuously protected by the protector 1.

When the protective body 1 is attached to the elongated body 15 for protection, a large tension is applied to the elongated body 15 due to the load of the protective body 1 during installation.
The guide pipe 18 is used to remove the load during the laying process.
The installation work can be carried out safely.

In addition, when the long body with protection is guided by the long body guide tube and descends into the sea, the long body with protection is connected with a plug-in type made of rubber elastic body with a space between them. Since they are connected by a fitting, they can be bent with the necessary curvature using this spacing and rubber elasticity, and they descend to the seabed while taking a natural shape underwater, and the protective attachment length is lowered while descending. This can prevent the ulnar body from being damaged by its own weight.

The attachment length of the protective body 1 to the long body 15 is the seabed 1 that requires protection.
When the length becomes a little longer than the transverse length of 7A, stop installing the protector 1 and return to the laying work without protection.

In the above embodiment, an example using a concrete protector is described, but the protector is not limited to this, and may be, for example, a protector made of cast iron.

As explained above, the present invention includes a protective body having a connector fitting locking hole at the rear end, and a rubber elastic body whose front part projects from the tip of the protective body and whose rear part is supported by the protective body. Since the protection work is carried out on the laying ship using a plurality of two-piece protection bodies each consisting of a body and a plug-in connector, the work of attaching the protection bodies can be easily carried out even while the long bodies are being fed out.

In addition, since the long body with protection is guided to the seabed through the long body guide pipe, the load of the protective body can be shared between the long body and the long body guide pipe, so the protection can be carried out onboard the laying ship. Even if it is applied, the installation work can be carried out safely without applying a large load to the long body.

At this time, in the case of a long body with protection, since the protection bodies are connected with a space between them with a plug-in connector made of a rubber elastic body, this space and the elasticity of the rubber are used to bend the body to the required curvature. The protective long body 75 can be prevented from being damaged by the weight of the protective elongated body 75 during descent.

Furthermore, it is possible to economically protect only the sections that require protection as needed.

Furthermore, protection work can be carried out without any trouble even in the absence of a diver or even in sea areas where the current is so strong that a dipper cannot dive.

[Brief explanation of the drawing]

1 and 2 are perspective views and longitudinal sectional views showing an example of the protective body used in the method of the present invention, and FIGS. 3 and 4 are 2
A cross-sectional view of the connecting device that connects the divided protective body before connection and a cross-sectional view of the state after connection.
FIG. 6 is an explanatory diagram of the installation method of the present invention, and FIG. 7 is a side view of a guide tube guiding the protected elongate body. . 1... Protective body, 2... Protective body, 3,
5... Long body through hole, 4, 7... Split surface, 6... Plug-in type % type %

Claims (1)

[Claims] 1. A protective body having a connector fitting locking hole at the rear end, and a plug-in type connector made of a rubber elastic body whose distal end protrudes from the front part of the protective body and whose base is supported by the protective body. A plurality of two-part protective bodies are attached to the outer periphery of the elongated body on the installation ship, and the front and rear protective bodies are fitted and locked with the connectors of the previous protective body with a space between them. By inserting the tips of the plug-in connectors of the latter protection body into the holes, they are connected to each other to protect the elongated body, and this elongated body with protection is suspended from the laying ship at an angle to the seabed. A method for laying a long body on the seabed, characterized in that the laying is carried out while guiding the long body to the seabed through a long body guide.