JPH02131313A - Burying machine for cable in the bottom of water - Google Patents

Abstract

PURPOSE:To achieve sufficient cable burying depth by providing a fulcrum arm utilizing the principle of lever and producing strong pushing force. CONSTITUTION:A buried cable 7 is grasped by the tip section 3a of a fulcrum arm 3 extending laterally downward from the body 1 of burying machine and the tip section 3a serves as the fulcrum of lever. Then force stronger than the weight of the burying machine body 1 is applied, based on the principle of lever, onto a cable push-in arm 4 branched in the way of the fulcrum arm 3 thus pushing the buried cable 7 into the sand. At the same time, water jet 6 fed through a submersible pump 2 is delivered downward thus digging the sand in the vicinity of the cable 7 and burying the cable 7 into the sand. When the length and the angle of the fulcrum arm 3 are adjusted, the cable 7 can be pushed downward with force several times as strong as the weight of the burying machine body.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a submarine cable burying machine.

[Conventional technology]

There are various methods for burying underwater cables, but in a conventional burying machine that uses a jet stream to bury underwater cables, as shown in Figure 2, the cable is pushed in, extending from the burying machine body 1. The water jet 6 is ejected from the tip of the arm 10 to dig up the earth and sand at the bottom of the water, and the weight of the burial machine body 1 is applied to this arm 10 to push the cable 7 into the earth and sand below. The idea was to bury it deeper into the earth and sand.

[Problem to be solved by the invention]

However, even if you bury the cable at the same time as laying it, or bury the cable once it has been laid on the water bottom, in order to bury the cable deep into the water bottom, it is necessary to use strong force to bury the cable in the sediment below. You need to push it inside. In the conventional burying method described above, a jet stream is emitted from the tip of the arm extending from below the burying machine to dig up the earth and sand.
Another method was to put the weight of the burying machine itself on its arm, and use that arm to hold the cable down to the bottom of the water. This method requires a heavy burial machine due to its buoyancy in water, but a heavy burial machine has drawbacks in terms of operability and the like. In particular, when burying a cable after it has been laid (post-burying), or when repairing a buried cable and re-burying it, a compact burying machine that can be buried at a deep depth is required. [Means for Solving the Problems] The underwater cable burying machine of the present invention includes a burying machine main body having a submersible pump, and a cable burying water pipe that is provided to protrude downward from the burying machine main body and that is provided from the submersible pump for burying the cable. The weight of the burying machine main body relative to the first arm is controlled by a lever principle that uses a first arm that discharges a jet and a tip that protrudes downward from the burying machine main body and is in contact with the bottom surface of the water as a fulcrum. It has a second arm that applies a force exceeding the

〔Example〕

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

FIG. 1 is a side view of an embodiment of the present invention under water.

In this embodiment, a cable pushing arm 4 is provided to protrude downward from a burying machine main body 1 having an underwater pump 2, and has a nozzle 9 for discharging a water jet 6 for burying a buried cable 7, and It has a fulcrum arm 3 that captures the buried cable 7 by using the contacting tip 3a as a fulcrum, and from the nozzle 9 at the tip of the cable pushing arm 4, water is sent from the underwater pump 2 or from the ship through a water supply hose. Jet 6 is discharged. Further, a propeller 5 for creating a jet flow is provided in the burial machine main body 1 to increase the force for pushing the buried cable 7 downward.

According to this embodiment having such a configuration, the laid buried cable 7 is grasped by the distal end portion 3a of the fulcrum arm 3 extending laterally downward from the burying machine main body 1, and this point is used as the fulcrum of the lever.

Using a lever principle, a force greater than the weight of the burying machine body 1 is applied to the cable pushing arm 4 which is split from the middle of the fulcrum arm 3, and at the same time the buried cable 7 is press-fitted into the earth and sand below. Saichita Jet 6 sent by
By discharging downward, the earth and sand near the cable 7 is dug up and the cable 7 is buried in the earth and sand. Therefore, by adjusting the length and angle of the fulcrum arm 3, it becomes possible to push the cable 7 downward with a force several times the weight of the burying machine main body 1 using the lever principle. Note that by rotating the propeller 5 attached to the burying machine main body 1, the downward force of the burying machine main body 1 can be increased more effectively.

In this way, by utilizing the lever principle, a sufficient burying depth can be obtained, so that a compact burying machine main body 1 can be used.

〔Effect of the invention〕

As explained above, by providing a fulcrum arm that utilizes the "lever principle", the present invention is small and can exert a strong force to push the cable under the water.
In cable burying work, especially in re-burying repaired cables, it is possible to obtain a sufficient cable burying depth. Furthermore, it is also possible to attach a burying function using the "lever principle" according to the present invention to a conventional burying machine and use it only when necessary.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of the present invention under water, and FIG. 2 is a side view of an example of a conventional underwater cable burying machine. DESCRIPTION OF SYMBOLS 1... Burying machine main body, 2... Underwater bomb, 3... Fulcrum arm, 4, 10... Cable pushing arm, 5... Blowera, 6... Usaita jet, 7 ... Buried cable, 8... Underwater surface, 9... Nozzle.

Claims (1)

[Claims] a burying machine main body having a submersible pump; a first arm protruding downward from the burying machine main body and discharging a water jet for cable burying from the submersible pump; and a first arm projecting downward from the burying machine main body. and a second arm that applies a force exceeding the weight of the burying machine body to the first arm by the lever principle with the tip part in contact with the bottom surface of the water as a fulcrum. Cable burial machine.