JP2003034288A - Manufacturing method for long length pipe on the water and installation method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a long length pipe through which deep seawater and the like can be pumped up without spending an immense construction cost and an installation method therefor. SOLUTION: The manufacturing method for a long length pipe on the water is performed in such a way that a platform ship is floated on the water which is equipped with an upper jack 7 and a lower jack 8 at a circumference of an opening 5, a lower side short pipe 4 inserted to the opening 5 and held by the lower jack 8 is made to abut on an upper side short pipe 4a held by the upper jack 7 and connected by welding, the connected short pipes are shifted downward by releasing the jacks 7, 8, and then other short pipe held by the upper jack 7 is made to abut on the welded short pipes 4, 4a and then welded thereto.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for forming a long tube on water and a method for installing the long tube.

[0002]

2. Description of the Related Art Generally, deep sea water having a depth of 200 m or more has characteristics such as eutrophication, mineral content, and low temperature stability. Therefore, utilization research and commercialization are being promoted nationwide. . Such deep sea water is pumped by a thin hose, and when pumping a large amount of water, it was necessary to lay a long pipeline from land.

[0003]

However, when a large amount of deep sea water is pumped up and used, it is necessary to construct a long pipeline from the land, which causes a problem of enormous construction cost.

The present invention has been made in view of the above problems, and an object thereof is to save a huge construction cost.
It is an object of the present invention to provide a method for forming a long pipe capable of pumping deep sea water and the like and a method for installing the long pipe.

[0005]

According to a first aspect of the present invention, which is a means for attaining the above-mentioned objects, a barge having an upper jack and a lower jack around an opening is floated on water and the opening is provided. After inserting the upper short pipe gripped by the upper jack into the lower short pipe inserted into the section and gripped by the lower jack, these jacks are opened and the joined short pipe is moved downward. It is characterized in that it is shifted and the other short pipe held by the upper jack is butted against the joined short pipe and joined. The invention of claim 2 is the combination of a plurality of floats moored by a mooring chain according to claim 1, wherein the pontoon is inserted into an insertion slit formed from a central portion toward a corner on the opening side. It is characterized by forming. According to the invention of claim 3, after the buoyancy tank is provided on the upper portion of the long tube of claim 1, the ship is dismantled, water is poured into the buoyancy tank to immerse the long tube in water, and then the buoyancy tank. The feature is that the long pipe is pulled up from the water with a crane while discharging the water inside, and is installed from the lower side to the opening of another ship.

By connecting the short pipes on the water, a long pipe having a large diameter and capable of pumping deep sea water can be easily formed without cost. Further, by combining a plurality of floats moored by the mooring chain that has passed through the insertion slit, it is possible to form a balanced and stable barge. Further, a long pipe having a large diameter can be formed in a vertical state. By submerging the long tube in water, it can be easily attached to other piers from below.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the method of forming a long tube on water and the method of installing the same according to the present invention will be described below with reference to the drawings. First, an embodiment of a method for forming a long tube will be described, and then an embodiment of a method for installing a long tube will be described. However, in each embodiment, the same configurations will be described with the same reference numerals, and different Only different configurations will be described with different reference numerals.

FIG. 1 shows an embodiment of a method for forming a large-diameter intake pipe for pumping deep sea water, where the water depth is 400.
It is performed on the pier 1 on the sea of 500 m or more. As shown in FIG. 2, the pontoon 1 is formed by combining four square floats 2. The number of floats 2 is not limited to four and may be four or less (for example, two) or four or more.

As shown in FIG. 3, the float 2 is installed on the seabed by a mooring chain 3 which passes through an insertion slit 2a formed from the central part toward one corner (opening side of the pier). It is moored to the anchor 3a. In this way, the mooring chain 3 is inserted into the insertion slit 2a from the central portion of the float 2 and is connected to the diagonal anchor 3a of the insertion slit 2a from here through the lower side of the float 2, so that the float 2 is Moored in a very stable condition. Then, each float 2 is pulled by a tug boat (not shown).
It is possible to form a well-balanced and stable ship 1 by pulling them together and joining them. This barge 1
In the center of the, a short pipe with a large diameter and a predetermined length (φ2.5m ×
60-70 m) 4 is provided with an opening 5 into which an jack 5 is provided so as to surround the opening 5.

The jack device 6 is composed of four jacks 7 and 8 for each of the upper and lower parts, and is installed in a frame body 9 assembled around the opening 5. These jacks 7 and 8 are hydraulic jacks in which a cylinder 10 expands and contracts by hydraulic pressure, and a friction shoe 11 is attached to the tip of the cylinder 10. A support device 12 for supporting the short pipe 4 is installed on the frame 9 below the lower jack 8, and a support pipe 13 of the support device is slidable toward the opening 5 side. The upper and lower jacks 7 and 8 are not limited to four, and more jacks can be installed.

A method of forming an intake pipe using such a barge 1 will be described. First, as shown in FIG.
The short pipe 4 provided with a flange 14 on the outer periphery of the upper part and an inner guide 15 projecting from the inside of the upper end is lifted by a crane (not shown) and inserted into the opening 5 of the ship 1 and the flange 14 is supported. It is supported by the pipe 13. Then, the cotter 16 is fitted between the short pipe 4 and the opening 5 to fix the short pipe 4 to the pontoon 1. Next, lower jack 8
The cylinder 10 is extended and the friction shoe 11 is pressed against the outer circumference to secure the verticality of the short pipe 4.

Next, another short pipe 4a suspended by a crane
Is abutted on the short pipe 4 by the guide of the inner guide 15. Then, the cylinder 10 of the upper jack 7 is extended, and the friction shoe 11 at the tip is pressed against the outer circumference to secure the verticality of the other short pipe 4a. Next, the short tubes 4 and 4a whose ends are abutted with each other and verticality is ensured are welded to each other. In addition, this connection can also be achieved by connecting the connecting flanges provided at the ends of the short pipes 4 and 4a with bolts. If the short pipes 4 and 4a are made of synthetic resin, they can be welded and joined.

Next, as shown in FIG. 5, a hook of the crane is hooked on the short pipes 4 and 4a welded and joined (not shown). Then, the cotter 16 is removed from the opening 5, and the upper and lower jacks 7 and 8 and the supporting device 12 are opened. Next, the short pipe 4 is suspended by a crane and is shifted downward by its own weight, and the flanges of the other short pipes 4a are supported by a support pipe (not shown). Repeat this work,
Intake pipe 1 with a total length of about 400m when short pipes 4 are added in sequence.
7 can be formed. Further, although the water intake pipe 17 is formed by joining the short pipes 4 and 4a made of steel, the present invention is not limited to this, and it is also possible to form the short pipe made of synthetic resin by joining.

Although the above embodiment is directed to the method of forming the intake pipe 17 on the sea, the intake pipe 17 can also be formed on the water of a lake or the like. It is also possible to form a steel pipe pile to be installed.

Next, a method for installing such an intake pipe in an intake device for pumping deep water will be described. First, as shown in FIG. 6, the intake pipe 1 installed on the barge 1.
A buoyancy tank 18 is installed on top of 7. The buoyancy tank 18 is provided with a floating / sinking mechanism capable of injecting and discharging ballast water and air, and is installed at a position slightly lower than the upper end portion. After the buoyancy tank 18 is installed, the pontoon 1 is disassembled into four floats 2 and removed from the intake pipe 17. When the pontoon 1 is removed, the intake pipe 17 is floated on the sea by the buoyancy tank 18.

Next, as shown in FIG. 7, the temporary lifting device 1
In addition to installing the intake pipe 17 in 9, the intake pipe 17
The hook 23 of the crane 22 is attached through the opening 21 of the water intake device 20. Next, as shown in FIG. 8, ballast water is injected into the buoyancy tank 18 to sink the intake pipe 17 to the lower side of the water intake device 20. Next, as shown in FIG. 9, while the water in the buoyancy tank 18 is being discharged, the water intake pipe 17 is lifted by the crane 22 and the upper portion thereof is inserted into the opening 21. In this way, the water intake device 17 of the intake pipe 17 having a total length of 400 m
Can be installed in

[0017]

By connecting the short pipes on water,
A large-diameter long pipe capable of pumping deep sea water can be easily formed without cost.

A long pipe having a large diameter can be formed in a vertical state.

By combining the four floats moored by the mooring chain that has passed through the insertion slit, it is possible to form a balanced and stable ship.

By submerging the long tube in water, the long tube can be attached to another pier from below.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a method of forming an intake pipe.

FIG. 2 is a plan view of a barge.

FIG. 3A is a plan view of the float, and FIG. 3B is a sectional view of the float.

FIG. 4 is a cross-sectional view of a pontoon holding a short pipe with a jack.

FIG. 5 is a cross-sectional view of a barge with the jack open.

FIG. 6 is a conceptual diagram of an intake pipe formed by a barge.

FIG. 7 is a diagram showing a method of installing the intake pipe, in which the intake pipe is installed in the temporary lifting device.

FIG. 8 is a view showing a method of installing the intake pipe, in which the intake pipe is submerged.

FIG. 9 is a view showing a method of installing the water intake pipe, in which the water intake pipe is installed in the water intake device.

FIG. 10 is a conceptual diagram of a water intake device.

[Explanation of symbols]

One ship 2 floats 2a insertion slit 3 mooring chains 3a anchor 4, 4a short tube 5,21 opening 6 Jack device 7 Upper jack 8 lower jack 9 frame 10 cylinders 11 Friction shoe 12 Support device 13 Support pipe 14 Flange 15 Inner guide 16 cotter 17 Intake pipe 18 buoyancy tank 19 Temporary lifting device 20 Water intake device 22 cranes 23 hook

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Eiji             2-2-8 Koraku, Bunkyo-ku, Tokyo Goyo Construction Co., Ltd.             Inside the company (72) Inventor Hidehisa Shimizu             2-2-8 Koraku, Bunkyo-ku, Tokyo Goyo Construction Co., Ltd.             Inside the company (72) Inventor Shigeo Kawashima             2-26-2 Tsuruya-cho, Kanagawa-ku, Yokohama-shi, Kanagawa               Goyo Construction Co., Ltd. Yokohama (72) Inventor Katsuyuki Yoshida             2-1-1 Nanachinomiya-cho, Hyogo-ku, Kobe-shi, Hyogo             Kami Construction Co., Ltd.

Claims (3)

[Claims] 1. A pedestal having an upper jack and a lower jack around an opening is floated on water, and is gripped by the upper jack on a lower short pipe inserted into the opening and gripped by the lower jack. After butt-joining the joined short pipes, open these jacks to shift the joined short pipes to the lower side, and then butt the joined other short pipes held by the upper jack. A method for forming a long tube on water, characterized by joining. 2. The boat is formed by combining a plurality of floats moored by a mooring chain inserted into an insertion slit formed from a central portion toward a corner on the opening side. Item 2. A method for forming a long tube on water according to Item 1. 3. The buoyancy tank provided with a floating / sinking mechanism is provided on the upper part of the long pipe of claim 1, after dismantling the pontoon, and pouring water into the buoyancy tank to submerge the long pipe in water. , A method of installing a long pipe on water, characterized in that the long pipe is pulled up from the water by a crane while discharging water in the buoyancy tank, and is attached to the opening of another ship from below.