JPS6344031A - Spade width variable device for submarine cable embedding machine - Google Patents

Abstract

PURPOSE:To diminish the capacity of vessel equipments, by composing a spade of auxiliary spades which are fitted to be vertically moved on both the sides of the upper section of a main spade, and by moving the auxiliary spade downward to work together with the main spade just before a repeater is embedded. CONSTITUTION:The auxiliary spades 19 of an embedding machine are set in a state that they are kept moved upward by oil-pressure cylinder 21 with the center of a pin 22. After that, the embedding machine is taken in tow by a mother ship via a wire rope, and the groove of the width of approx. 10cm is excavated by a main spade 4 and at the same time a cable 16 for embedding is embedded in the sea-bottom. After that, before a repeater 20 is embedded in the sea-bottom through a cable guide 17 and a cable passage 18, the auxiliary spade 19 are moved down to the same excavation depth as that of the main spade 4 by the cylinder 21, and the groove of the width of approx. 30cm including the added excavation width of the main spade 4 is excavated, and the repeater 20 is embedded.

Description

Detailed Description of the Invention (Related Industrial Field) The present invention relates to a narrow width variable device in a submarine cable burying machine.

(Prior Art) In submarine cables, the diameter of a buried cable is approximately 10A1 or less, while the diameter of a repeater is approximately 30CI11, so the narrow width of a buried cable is controlled and determined by the diameter of a repeater. However, only one repeater is connected to the cable every 4 km. As most of the burying work involves burying the cable itself,
Originally, the narrow width (excavation width) was 10 for cable burial.
1 should be sufficient, but since it is necessary to bury the repeater as well, the narrow width has been set at 30 am. Therefore, the excavation width is always 30C even when burying cables! 1, the resistance to digging was unnecessarily large, and the mother ship had to be equipped with a large-capacity winch. Furthermore, since the towing force becomes large, mutual operation between the mother ship and the burying machine is difficult, and there are difficulties in burying cables and repeaters uniformly and reliably.

(Problems and objects to be solved by the invention) In a plow-type submarine cable burying machine, by reducing the digging resistance of the plow that excavates the cable burying trench, and by reducing the towing force of the burying machine of the mother ship, The purpose is to reduce the capacity of onboard equipment such as the winch for towing the buried machine installed on the mother ship, facilitate mutual operation between the mother ship and the buried machine, and ensure stable cable burying work.

(Solution Means of the Invention) A main part is attached to the body of the burying machine so as to be able to be raised and lowered by a lifting arm pin-coupled to the body, and has a necessary minimum width for burying cables, and cylinders for raising and lowering auxiliary plows are installed on both sides of the upper part of the main part. The plow is constituted by an auxiliary weight attached to be movable up and down, and the auxiliary weight is lowered to cooperate with the main part only when burying the repeater.

(Example) Examples will be described below with reference to the following sections. Figure 1 shows
FIG. 2 is a plan view of FIG. 1 of the underwater cable burying machine in which the present invention is implemented. The body 1 of the burial machine is towed by a towing rope 3 from a cable laying ship (not shown) on the sea, and slides on the seabed surface 2. Reference numeral 4 denotes a main portion, which is connected to a cable guide portion 6 at the rear by a hinge 5. The main part 4 is
It is attached with a pin 9 to an upper hook lifting arm 8 whose one end is pivotally attached to the fuselage 1 with a pin 7. Hydraulic cylinders 10 and 10 are attached to the left and right sides of the lifting arm 8 with pins 11, and the other end of the hydraulic cylinder 10 is attached to the fuselage 1 with a pin 12, and when the hydraulic cylinder 1o expands and contracts, it lifts and lowers. The arm 8 is configured to move up and down in the vertical direction.

Another hydraulic cylinder 13 is attached to the lifting arm 8 with a pin 14, and the other end of the hydraulic cylinder 13 is connected to the head of the main portion 4 with a pin 15.

A buried cable 16 supplied from a laying ship is guided by a cable guide 17, passes through the upper part of the main part 4, passes through a cable passage 18, and is laid at the bottom of the excavation trench.

Now, 19 is an auxiliary weight of approximately Loan width, which is pivotally connected to the cable guide part 6 on both sides of the main part 4 by pins 22, and is also attached to the top of the guide part 6. The auxiliary plow can be raised and lowered by a cylinder 21 for raising and lowering it. When burying the buried cable 16, dig a cable burying trench using only the main part 4 (approximately 1° 1 width) and do not use the auxiliary cable s19.
It will fit into an excavated trench with a width of 0c2n and be buried.

Main part 4 and auxiliary weight 1 only when burying a few repeaters 20
9 at the same time to dig a trench about 30 cm wide, and bury the repeater 20 in this trench.

(Function) The buried aircraft body 1 is connected to the mother ship (
The buried cable 16 and repeater 20, which are unwound from the mother ship while being towed by a ship (not shown), are buried in the seabed. When burying the buried cable 16, the main part 4 maintains the posture shown in the figure, and when digging a trench of about 10 a width in the seabed and burying it, the auxiliary weight 19 is pivoted by the hydraulic cylinder 21 for lifting and lowering the auxiliary plow. The pin 22 is raised to the position shown by the two-dot chain line in FIG. 1. In other words, when burying the buried cable 16, a trench about 10 cm wide is dug using only the main part 4 and the cable is buried.

On the other hand, when the repeater 20 passes through the cable guide 17 and the cable passage 18 and is buried in the seabed, the main part 4 maintains the position shown in the figure, and at the same time the auxiliary weight 19 is raised and lowered by the auxiliary plow to the same excavation depth as the main part 4. It is lowered by the hydraulic cylinder 21 for the third
As shown in the figure, a groove with a width of about 30a11, including the excavation width of the main part 4, is excavated, and the repeater 2° is placed and buried in this groove.

When the burial of the repeater 20 is completed, the auxiliary fi 19 is again raised above the seabed by the auxiliary plow lifting hydraulic cylinder 21, an excavation trench with a width of about 10 mm is dug using only the main part 4, and the buried cable 16 is pulled up by a rower. Buried.

As mentioned above, when burying only the cable 16, only the main part 4 is used, and when burying the vicinity of the repeater 20 that connects cables, the auxiliary weight 19 is lowered and the main part 84 and the auxiliary weight 19 are used to fill the groove. dig. In this way, different plows are used depending on the diameter of the buried object.

(Effects) The plow consists of a main part that is mounted so that it can be raised and lowered by an elevating arm and has the necessary minimum width for burying the buried cable, and auxiliary weights that are mounted on both sides of the upper part of the main part so that it can be raised and lowered by cylinders for raising and lowering the auxiliary plow. However, since the auxiliary plow was brought down only when burying the repeater and made to work together with the main plow,
It is possible to reduce the digging resistance of the plow during cable burying work, which accounts for most of the cable burying work, and to reduce the towing force of the burying machine on the mother ship, making it possible to reduce the capacity of onboard equipment such as the towing winch on the mother ship. Become.

Additionally, with the reduction in the towing power of the burying machine, mutual operation between the mother ship and the burying machine became easier, making the cable burying work more stable and reliable, and at the same time making it possible to increase work efficiency.

Furthermore, the number of repeaters is 171 compared to conventional coaxial cable.
The above-mentioned effects of the present invention can be expected to be even greater today and in the future, when optical cables are frequently used, which has decreased dramatically to 0 (at a rate of 1 cable per 40 km).

[Brief explanation of the drawing]

FIG. 1 is a side view of a submarine cable burying machine embodying the present invention. Figure 2 is also a plan view. FIG. 3 is a sectional view taken along line mm in FIG. In the figure: 1 fuselage 2 seabed 3 tow rope 4 main plow 5 hinge 6 cable guide 7 pin
8 Main lift arm 9 Pin
1o Hydraulic cylinder 11 Pin 1
2 Pin 13 Hydraulic cylinder 14 15 Pin 16 Cable 17
Cable guide 18 Cable passage work 9 Auxiliary plow 2o Relay pipe 21 Hydraulic cylinder 2
2 Auxiliary plow pivot pin or above

Claims (1)

[Claims] A main plow (4) is attached to the body of the burying machine so that it can be raised and lowered by a lifting arm that is connected to the body of the burying machine by a pin, and has the minimum necessary width for burying cables, and cylinders for raising and lowering the auxiliary plow (4) are installed on both sides of the upper part of the main plow (4). A plow is constituted by an auxiliary plow (19) which is attached so as to be able to be raised and lowered by a relay (21), and a repeater (20).
The auxiliary plow (19) is lowered only when burying the main plow (4).
) A variable plow width device for a submarine cable burying machine.