JP2001032961A - How to lay deep water intake hose - Google Patents

Abstract

(57) [Problem] In a conventional method for laying a deep water intake hose, a large-diameter hose drum is used, so that the equipment for rotating the hose drum becomes large, and a drum and a driving device are used. It costs a lot of money. SOLUTION: In the deep water intake hose laying method of the present invention, a plurality of small-diameter hose drums wound with an intake hose are transported on land, and each of the hose drums is placed on a receiving stand on a laying boat, and the hose drum is moved from the hose drum. Is laid underwater, and the hose drum on the receiving stand where the intake hose has been removed is replaced with a new hose drum around which the intake hose is wound, and the intake hoses of successive hose drums are connected to each other. The water intake hose laid underwater is wound around the outer periphery of a plurality of sheaves, and the feeding speed of the water intake hose is controlled by the frictional force between the two.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of laying a deep water intake hose, and more particularly to a method of laying an intake pipe for taking water from a remote deep water area.

[0002]

2. Description of the Related Art Conventionally, in order to take water from a deep water area of about 300 m or more at a remote point of about 3000 m, as shown in FIGS. A water intake pipe (hose) 2 such as a single polyethylene pipe or the like is wound around, and the drum 1 is mounted on a laying barge 3. The drum 1 is continuously extended while being rotated while being buried. 3 and 4, reference numeral 4 denotes a drum driving device with a brake, 5 denotes a hydraulic unit, 6 denotes a generator, 7 denotes a boat maneuvering winch, 8 denotes a measurement room, 9 denotes a braking device, 1
0 is a hose guide.

FIGS. 5 and 6 show an example in which the hose drum 1 is mounted on a large turntable (turntable) 11.

[0004] Fig. 7 is a conceptual diagram of the laying state of intake pipes, where 12 is a tug of the laying barge 3, and 13 is the seabed ground.

[0005]

However, when laying a hose at the above-mentioned water depth, the greater the depth, the greater the weight of the underwater hose, and when laying the hose, the brake force applied to the hose also needs to be large enough. . The speed of laying is also an important factor. If the extension is too fast, the bending radius of the hose will exceed the allowable value, and if it is too slow, the hose will be pulled, and if the hose exceeds the allowable tensile load, breakage / damage will occur. Occurs.

For example, in order to rotate a drum having a drum flange outer diameter of 15 m or more, a large amount of machinery and equipment is required, and enormous costs are required for the drum and its driving device.

The present invention has been made to eliminate the above disadvantages.

[0008]

The method for laying a deep water intake hose according to the present invention comprises a step of transporting a plurality of small-diameter hose drums wound with an intake hose on land, and a pedestal on which the hose drums are laid. And laying the intake hose from the hose drum underwater, replacing the hose drum on the cradle with no intake hose with a new hose drum around which the intake hose is wound, Connecting the intake hoses to each other.

[0009] The water intake hose laid in the water is characterized in that it includes a step of winding around the outer circumference of a plurality of sheaves and controlling the feeding speed of the water intake hose by a frictional force between the outer circumference of the sheave.

[0010]

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

In the present invention, as shown in FIGS. 1 and 2, a plurality of small-diameter hose drums 1 each having a diameter of about 4 m, on which an intake hose 2 is wound, are transported on land and placed on a laying barge 3 offshore. The intake hose 2 wound on the drum 1 is placed on the receiving stand 14 with the drum drive mechanism and laid underwater. At this time, when the water intake hose wound around the drum 1 runs out, the drum is replaced with a new hose drum around which the water intake hose is wound on the receiving stand 14, and the new hose and the previous hose are heat-sealed as needed. To make one long-distance hose,
Lay continuously underwater.

When the hose 2 is laid underwater from the sea by the laying barge 3, in order to prevent the hose 2 from being drawn into the water at a stretch due to the weight of the hose, a brake device 15 with a hose feeding speed control is used. . When the hose tension exceeds the set load according to the braking capacity, a safety mechanism is added to the braking device to avoid damage or breakage of the hose.

For example, in the present invention, it is assumed that the braking device 15 generates a large braking force by a combination of two sheave type braking devices and a small drum driving device.

The above-mentioned sheave type braking device is characterized in that a frictional force of a hose contact portion on the outer periphery of two sheaves is used as the braking force.

The hydraulic system controls the sheave rotation speed and the drum drive. In order to pay out the hose at a constant speed, all the braking devices must load share (synchronous rotation) at a constant ratio. For this reason, when combining several braking devices, the share ratio of each braking capability shall be maintained.

Further, when replacing the empty drum with a fully-wound drum and connecting the hose 2 on the laying boat 2, the weight of the laid hose must be temporarily grasped. In this case, the connection point 16 is made at the hose drum pull-out start portion, and the weight of the hose on the laying side is similarly gripped by the frictional force of the sheave.

The sheave diameter is determined by the allowable bending radius of the connection point 16 and the required frictional force.

[0018]

The method for laying a deep water intake hose of the present invention is as follows.
As described above, there is a great advantage that the manufacturing cost of the hose drum can be reduced and the driving device can be simplified.

[Brief description of the drawings]

FIG. 1 is a front view of a laying barge used to carry out the method for laying a deep water intake hose of the present invention.

FIG. 2 is a plan view of the laying barge shown in FIG.

FIG. 3 is a front view of a laying barge used for carrying out a conventional deep water intake hose laying method.

FIG. 4 is a plan view of the laying barge shown in FIG. 3;

FIG. 5 is a front view of a laying barge used to carry out another conventional deep water intake hose laying method.

FIG. 6 is a plan view of the laying barge shown in FIG.

FIG. 7 is a conceptual diagram of an installation state of an intake pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum 2 Hose 3 Laying barge 4 Drum drive unit 5 Hydraulic unit 6 Generator 7 Maneuvering winch 8 Measurement room 9 Braking device 10 Hose guide 11 Large turntable 12 Towing boat 13 Submarine ground 14 Cradle 15 Braking device 16 Connection point

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsutomu Iwasaki 2-8-8 Koraku, Bunkyo-ku, Tokyo Within Goyo Construction Co., Ltd. (72) Inventor Akihisa Yamamoto 2-2-2 Koraku, Bunkyo-ku, Tokyo Goyo Construction Co., Ltd.

Claims (2)

[Claims] 1. A step of transporting a plurality of small-diameter hose drums on which an intake hose is wound up on land, and a step of placing each of the hose drums on a receiving stand on a laying barge and laying an intake hose from the hose drum in water. Replacing the hose drum on the cradle with no intake hose with a new hose drum around which the intake hose is wound, and connecting the intake hoses of successive hose drums to each other. To lay deep water intake hose. 2. The method according to claim 1, further comprising a step of winding the water intake hose laid underwater around the outer circumference of the plurality of sheaves, and controlling the feeding speed of the water intake hose by a frictional force with the outer peripheral surface of the sheave. The method for laying a deep water intake hose according to claim 1.