JP2639442B2 - Intake pipe laying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used for an ocean temperature difference power generation facility or the like, and an intake pipe for laying a long pipe in water such as a cold water intake pipe installed in the sea. Laying method.

[Background of the Invention] Ocean thermal energy conversion is a problem of the conventional power generation system, for example, the problem of drastic reduction of reserves of resources such as coal and oil in the thermal power generation system, or the problem of environmental pollution to nuclear fuel in the nuclear power generation system. In general, in sea areas where the surface temperature of seawater is 20 to 25 degrees, the temperature does not exceed 5 degrees C above 800m below the surface of the sea. This is a power generation system that pumps a large amount of water and converts the difference in thermal energy between the two into electric energy.

The principle will be described with reference to FIG.
Reference numeral 51 denotes a generator, and reference numeral 52 denotes a turbine. A low-boiling medium such as liquid ammonia is evaporated by an evaporator 53 using hot seawater, and the turbine 52 is turned.

Medium vapor after rotating turbine 52 (ammonia)
Is fed to the condenser 54 or cold seawater pumped up from the deep sea by the water pump 1 through the cold water intake pipe 1 and liquefied by the condenser 54, and then returned to the evaporator 53 again by the operation pump 56.

That is, the principle is the same as that of ordinary steam power generation, except that the working medium is not water but a material that boils at a low temperature.

As described above, the ocean temperature difference power generation is a very preferable power generation method from the viewpoint of resource saving because it utilizes natural energy called seawater.

However, a large amount of cold seawater must be taken from the deep sea more than 800m deep, so a long cold water intake pipe is required.How to lay this cold water intake pipe underwater is a major problem. Become.

As shown in Fig. 3, conventional laying of intake pipes is performed by attaching floats 61 at every required interval of the long cold water intake pipe 1 and extending them to the sea. A ship 62 is prepared and the line alignment at the time of laying is maintained, and the tip of the cold water intake pipe 1 is pulled by a tag wire 64 of a large tugboat 63.
Were gradually cut one by one, and the cold water intake pipe 1 was laid down on the seabed 6.

However, such a laying method requires a large number of workboats 62 and a large tugboat 63 for pulling the cold water intake pipe 1 is required, resulting in a problem that the construction cost is increased.

Further, since the construction work becomes large-scale, such as requiring a large number of work boats 62, there is a problem that the construction work can be performed only in a relatively mild climate which is not affected by waves.

Conventionally, a method of laying an intake pipe shown in FIG. 4 is also known.

This method uses a tag wire at the end of a long cold water intake pipe 1.
64 and connect this tag wire 64 to a large tugboat 63
And lay the long cold water intake pipe 1 on the sea floor by dragging.

According to this method, the cold water intake pipe 1 is almost laid on the sea bottom by being dragged, so that it is easy to maintain the line shape of the pipe. However, there is a problem that the cold water intake pipe 1 is damaged by the dragging.

As described above, the conventional method of laying an intake pipe has many problems in laying the cold water intake pipe 1 itself, and also has a great problem in the stability and durability of the pipe after the laying work.

[Object of the Invention] Thus, the present invention has been made in view of the above-mentioned conventional problems, and is not affected by the seafloor ground, does not wear or break the intake pipe, and has high durability. It is an object of the present invention to provide a method of laying an intake pipe which can easily lay underwater in the sea and at a low construction cost.

[Constitution of the Invention] In the method for laying an intake pipe according to the present invention, a cold water intake pipe 1 is sequentially extended into the sea from a marine facility located on land or near land, and the cold water intake pipe 1 is located at a required position in the longitudinal direction of the cold water intake pipe 1. An intake pipe holder 2 made of a buoyant body penetrating the intake pipe 1 is attached, and a weight 4 is hung on the intake pipe holder 2 to bring the cold water intake pipe 1 extending into the sea into a buoyant state. The tip of the cold water intake pipe 1 is held by a holding wire from the marine work boat 62, and is also connected to a tag wire 64, and the tag wire 64 is mounted on the seabed in front of the cold water intake pipe 1 13, a winch ship in which the tip of a tag wire 64 to which the tip of the cold water intake pipe is connected is placed above the weight body 13 at the sea.
The chilled water intake pipe is laid in a floating state at a required interval from the seabed, being pulled by a work boat 62 arranged in the vicinity of the laying boat 14 or the laying boat 12.

Examples of the Invention Hereinafter, the present invention will be described based on examples.

First, FIG. 5 is a schematic diagram showing a state in which a cold water intake pipe 1 is laid in a floating state at a required interval from the sea floor 6 in the sea by the laying method according to the present invention.

In the drawings, reference numeral 1 denotes a cold water intake pipe laid in the sea.

This cold water intake pipe 1 is configured to be long enough to extend, for example, to a depth of about 800 m or more on the sea floor 6, and is buried in the ground at a base side water depth of about 40 m, and It is made hard to be affected by the waves and its tip side is open to the sea, so that cold seawater in the sea at a depth of about 800 m can be pumped from the tip.

At a predetermined position in the longitudinal direction of the cold water intake pipe 1, a plurality of intake pipe holders 2 are attached.

As shown in the drawing, the intake pipe holding body 2 has a substantially tubular shape, and its hollow portion is a holding portion 7 of the cold water intake pipe 1 so that the cold water intake pipe 1 can be inserted with a clearance. Have been.

Furthermore, the inner peripheral surface of the holding portion 7 is configured to have a radius that expands toward both ends, so that even if a bending stress acts on the penetrating cold water intake pipe 1 from a substantially perpendicular direction, the bending stress is locally applied. It is configured not to be affected by.

By the way, the intake pipe holder 2 has a buoyancy part 8 and is configured to float in the sea.

The buoyancy portion 8 has various configurations. As a first embodiment, as shown in FIG. 11, a ring-shaped float unit 10 is provided on the outer periphery of the main body 9 of the water intake pipe holder 2.
There is something wound.

Note that air and the like are sealed in the float unit.

Next, as a second embodiment, as shown in FIG. 12, a plurality of float units 10 arranged on the outer periphery of the main body 9 in parallel with the longitudinal direction of the main body 9 and fixed at predetermined intervals in the circumferential direction. There is one configured by:

Further, as a third embodiment, as shown in FIG.
A low-specific-gravity member 11 such as low-specific-gravity rubber is fixed to the outer periphery of the buoyancy portion 8.

In any of these, a buoyancy portion 8 is formed on the outer peripheral surface of a substantially cylindrical main body 9 of the intake pipe holding body 2, whereby the intake pipe holding body 2 can be floated in the sea and the intake pipe holding body can be held. The strength of the body 2 can be improved.

As a fourth embodiment, as shown in FIG. 14, a buoyancy member 8 is formed by injecting a buoyancy member such as air into the main body 9 of the intake pipe holding member 2 in advance or during construction.
As an embodiment, as shown in FIG. 15, a buoyancy portion 8 is formed by injecting a low specific gravity member 11 such as oil or rubber into a main body 9 of an intake pipe holding body 2 in advance or during construction.

Further, as a sixth embodiment, as shown in FIG. 16, the main body 9 of the water intake pipe holder 2 itself may be constituted by a low specific gravity member 11 such as a low specific gravity rubber material.

Each of these does not have unnecessary projections on the outer periphery of the intake pipe holder 2, and thus has an advantage that the installation of the intake pipe holder 2 to the cold water intake pipe 1 can be performed smoothly.

By the way, a mooring rope 3 is connected to a lower side of the water intake pipe holding body 2, and the mooring rope 3 is locked to a weight 4 placed on the sea floor 6.

In the longitudinal direction of the cold water intake pipe 1 laid in the seabed 6 as shown in FIG.
Intake pipe holders 2 having buoyancy parts 8 are attached at the locations, and mooring ropes 3 are attached to these intake pipe holders 2.
Are respectively connected to the weight bodies 4... Placed on the sea floor 6 via the ground, and are laid in a floating state at a required height from the sea floor.

By the way, as shown in FIG. 5, the weights 4 are connected to each other by the chains 5, but this is because the weights 4 may move down or move when the seabed 6 has a steep gradient. This is in order to prevent that.

Further, as shown in FIG. 5, the distal end of the cold water intake pipe 1 is further connected to a weight body 4 installed below the same via a mooring rope 3, and the pulling force of the weight body 4 It is configured such that a uniform axial force is constantly applied to the entire cold water intake pipe 1 so that the cold water intake pipe 1 can be laid in a substantially straight line.
Also, by applying a constant axial force, the cold water intake pipe 1
When the water is pumped through the chilled water intake pipe 1, it is possible to sufficiently oppose an axial contraction force acting on the cold water intake pipe 1.

The weight 4 connected to the tip of the cold water intake pipe 1 may slip down or move further downward when the seabed slope is steep, so that the weight is reduced by the chain 5. The weight 4 may be fixedly locked on the seabed 6.

In addition, the length of the mooring rope 3 can be changed freely, and by changing the length of the mooring rope 3 freely, the cold water intake pipe 1 can be laid in a substantially straight line even on the seabed 6 with severe irregularities. I have to.

The method for laying the cold water intake pipe 1 according to the present invention will be described in detail below.

FIG. 1 shows a first embodiment of the present invention. First, a laying boat 12 is prepared on the sea near the land, and the cold water intake pipe 1 is gradually extended from the laying boat 12 into the sea.

When the cold water intake pipe 1 is extended into the sea, the above-mentioned substantially cylindrical intake pipe holder 2 is attached to the cold water intake pipe 1 and a float 61 is further attached and extended. The cold water intake pipe 1 is set in a floating state.

In front of the cold water intake pipe 1 to be laid, the laying position of the cold water intake pipe 1 is determined in advance, and a large weight body 13 whose mounting location is determined is placed on the laying point on the seabed 6. A tag wire 64 connected to the tip of the water intake pipe 1 is slidably engaged with the weight body 13 and pulled upward by a winch ship 14 located immediately above the weight body 13.

In this manner, the cold water discharge pipe 1 is gradually drawn out into the sea and transported to a position near the seabed, and the cold water is taken out at a predetermined laying position, that is, in a floating state at a predetermined interval from the seabed 6, while maintaining the line alignment. Water pipe 1 is laid.

As described above, in the present invention, the large weight body 13 plays an extremely important role in laying the cold water intake pipe 1.

In other words, a large weight body 13 is placed in a place where the final installation is desired, and then the cold water intake pipe 1 can be automatically brought to a predetermined installation place only by pulling the tag wire. Because.

When the cold water intake pipe 1 is pulled out, the cold water intake pipe 1
Float 61 is a cold water intake pipe 1
It shall be further separated.

In addition, a weight 4 is attached to the intake pipe holding body 2 in advance on the lower side thereof, and the weights 4... Are connected to each other by a chain 5, and a floating state is set at a required interval from the seabed 6. Therefore, even if the cold water intake pipe 1 is laid, a stable laid state can be maintained.

The weight body 4 and the chain 5 are set on the seabed 6 in advance, and the tag wire 64 is pulled to sink the cold water intake officer 1 into the sea and move it to the place where it is laid. The weight 4 and the chain can be connected to the intake pipe holder 2.

The feature of the present invention is that the intake pipe holding body 2 bundled by the buoyancy member can be used also for the laying work together with the float 61.

Next, a second embodiment of the present invention will be described with reference to FIG.

In this embodiment, it is the marine work boat 62 that pulls the tag wire 64 slidably locked to the large weight body 13, and the work boat 62 is arranged near the laying boat 12. By doing so, it is possible to prevent the disadvantage that the tag wire 64 is caught in the seabed, which is a drawback in the case of pulling along the seabed.

[Effect of the Invention] The present invention has the above configuration.

With the method of laying an intake pipe according to the present invention, the construction of a highly durable cold water intake pipe in the sea is not affected by the seafloor ground, and the intake pipe is not worn or damaged. It has an excellent effect that it can be performed quickly and at a low construction cost.

[Brief description of the drawings]

1 and 2 are schematic explanatory views showing respective embodiments of the laying method according to the present invention, FIGS. 3 and 4 are schematic explanatory views showing a conventional example, and FIG. 5 is a cold water intake pipe according to the present invention. FIG. 6 is a schematic view showing a state in which an intake pipe holder is attached, FIG. 7 is a schematic view showing an embodiment of an intake pipe holder, and FIG. 8 is an intake pipe holder. 9 and 10 are schematic views showing a state in which a constant axial force is applied by the weight to the tip of the cold water intake pipe. 11 to 16 are schematic diagrams showing each embodiment of an intake pipe holder, and FIG. 17 is a schematic diagram showing an outline of a temperature difference power generation mechanism. DESCRIPTION OF SYMBOLS 1 ... Cold water intake pipe 2 ... Intake pipe holder 3 ... Mooring rope 4 ... Weight body 5 ... Chain 6 ... Sea bottom 7 ... Holding part 8 ... Buoyancy part 9 ... Intake pipe holding part Body 10 Float unit 11 Low specific gravity member 12 Laying ship 13 Large weight body 14 Winch ship 51 Generator 52 Tarpin 53 Evaporator 54 Condenser 55 …… Pumping pump 56 …… Working pump 61 …… Float 62 …… Work boat 63 …… Large tag port 64 …… Tag wire

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takayoshi Ota 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Corporation (72) Inventor Katsuyuki Shimizu 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Corporation Stock In-house (72) Inventor Tetsuro Hori 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Corporation (72) Inventor Yasuhiro Nakai 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Corporation (72) Invention Author Shigeo Ueda 1-10-1 Kyobashi, Chuo-ku, Tokyo Inside Bridgestone Corporation (72) Inventor Hirotake Sugiura 1-1-10-1 Kyobashi, Chuo-ku, Tokyo Inside Bridgestone Corporation (72) Inventor Hisaya Junta Kyobashi, Chuo-ku, Tokyo 1-1-10-1 Inside Bridgestone Corporation (72) Inventor Hideaki Saito 1-1-1 Kyobashi, Chuo-ku, Tokyo 1-1-10 Inside Bridgestone Corporation (72) Inventor Maki Asaaki Inside Tobishima Construction Co., Ltd., Sanbancho, Chiyoda-ku, Tokyo (72) Inventor Yoshihiro Saiki Inside Tobishima Construction Co., Ltd., Sanbancho, Chiyoda-ku, Tokyo (72) Inventor Toshihiro Oka Sanbancho, Chiyoda-ku, Tokyo 2. Inside Tobishima Construction Co., Ltd. (56) References JP-A-61-65980 (JP, A) JP-B-51-31970 (JP, B1)

Claims (1)

(57) [Claims] 1. A cold water intake pipe 1 is sequentially extended into the sea from a marine facility at or near the land, and a buoyant body penetrating the cold water intake pipe 1 is provided at a required position in the longitudinal direction of the cold water intake pipe 1. The water pipe holder 2 is attached, and the weight body 4 is suspended from the water pipe holder 2 to bring the cold water intake pipe 1 extending into the sea into a buoyant state. While holding with the holding wire from 62, it is also connected to the tag wire 64,
The tag wire 64 is slidably engaged with the weight body 13 placed on the seabed in front of the cold water intake pipe 1, and the tip of the cold wire intake pipe is connected to the tip of the tag wire 64. Winch ship 14 placed above the weight body 13 above the sea
Alternatively, a method for laying an intake pipe, characterized in that the chilled water intake pipe is laid in a floating state at a required interval from the seabed, being pulled by a work boat 62 arranged near the laying boat 12.