JPS6344168B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting the position of a long body such as a cable or pipeline installed on the seabed or the like.

FIG. 1 explains the installation situation of the elongated body 1 on the seabed.

As is well known, when the elongate body 1 is laid on the seabed, the elongate body 1 is laid while being let out from the ship 2, but conventionally, the installation situation of the elongate body 1 could not be grasped in detail.

Visual inspection by divers or photography using television cameras were used to check the installation status, but in cases where the depth is deep or where the ocean currents (water currents) are strong and the water is murky, visual inspection is not possible. It was possible.

However, if the sea floor is sandy and relatively flat,
It is possible to run equipment to bury long bodies, but this is not possible if the rock is extremely uneven. In such a case, it is unclear how the elongated body has landed on the bottom, and it is inevitable that bridge 1 as shown in Figure 1.
I tended to create 0. 8 is the ocean floor.

If exposed to a strong water flow with such bridging, the elongated body 1 will vibrate and may be damaged in a short period of time. .

In view of this situation, the present invention aims to provide a method that can confirm whether a long body has landed on the bottom even in places where it is difficult to visually see due to strong water currents, etc. The cable can be laid while the cable is being laid, and it is also possible to check the bottoming status of the elongated body after the cable is laid.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described with reference to drawings showing embodiments of the configuration of the present invention.

be.

In FIG. 2, 1 is an elongated body to be installed, 3 is a rigid body that serves as a sound source, and the elongated body 1 is inserted through it.

4 is a rope that pulls the rigid body 3, and the long body 1
The rigid body 3 is moved along. The rigid body 3 is provided with a protrusion 5 on at least its bottom surface, and generates a contact sound when it comes into contact with the seabed 8. still,
In place of the protrusions 5, unevenness such as a groove shape may be provided.
This sound is detected by the sound collector 7.

6 is a protrusion provided in the elongated body 1 insertion hole of the rigid body 3. The sliding sound between the protrusion 6 and the elongated body 1 also
The sound is captured by the sound collector 7.

In this way, both the sliding sound between the rigid body 3 and the elongated body 1 and the contact sound between the rigid body 3 and the seabed 8 are collected by the same sound collector 7. However, the sliding sound between the rigid body 3 and the elongated body 1 that is captured by the sound collector 7 when being towed by the rope 4 is extremely weak because the sliding sound is generated inside the rigid body 3. be. On the other hand, the contact sound between the rigid body 3 and the seabed 8 is much louder. In other words, when the detected sound is weak, only the sliding sound with the elongated body 1 is generated, and when a loud sound is detected, the contact sound between the rigid body 3 and the seabed 8 is generated. I know that there is. Further, since no sound is generated when the rigid body 3 is not moving, the above-mentioned weak sound is naturally not detected.

With such a configuration, the position of the elongated body can be detected in the following manner.

(1) When a rigid body makes the sound of contact with rocks on the ocean floor, the elongated body is located on the ocean floor.

(2) Even though the rigid body makes a sliding sound against the long body, if there is no contact sound between the rigid body and the seabed, the long body is floating in the sea.

(3) If the rigid body does not make any sliding noise with the long body or contact sound with the seabed, the rope towing the rigid body is slack.

Therefore, if the length of the rigid towing rope is sufficiently long compared to the depth of the seabed, the speed of the ship is adjusted to avoid the situation described in (2) above, and a long body is laid,
The long body will definitely land on the bottom.

Of course, it goes without saying that it can be applied not only to submarine installations, but also to all underwater installations such as rivers, lakes, and marshes.

The method of the present invention as explained above provides the following remarkable methods.

(1) The state of a long object landing on the bottom can be detected even in places where it is difficult to see visually due to strong water currents or poor visibility.

(2) Since the long object can be reliably landed on the bottom of rock or uneven water bottoms where it is difficult to use a burying machine, etc., the long object will not become brittle in the water, and the long life of the long object will be reliable. Improves sex.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional method for laying a long body, and FIG. 2 is an explanatory diagram showing an embodiment of the present invention. 1: Long body, 2: Ship, 3: Rigid body, 4: Rope, 5: Protrusion, 6: Unevenness, 7: Sound collector, 8: Seabed.

Claims (1)

[Claims] 1 The rigid body 3 is inserted into the long body 1 during or after installation, and the rigid body 3 is moved along the long body 1 by the traction rope 4, and the rigid body 3 and the long body 1 are caused to slide. The sound and the sound generated by the contact between the rigid body 3 and the seabed 8 are detected by a sound collector 7 attached to the tow rope 4 near the rigid body 3, and a state where only the sliding sound is generated and a state where the contact sound is included are detected. A method for detecting the position of an elongated body, characterized by detecting the bottoming status of the elongated body 1 by identifying the position of the elongated body 1.