JPH09272493A - Cooling method of float-type structural body and mechanism therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent heat deformation, stress increase, and the like by supplying sea water of low temperature from one side wall of an internal partition chamber within a float and by discharging it from the other side wall thereof. SOLUTION: A float-type structural body 1 having a box-like structure floating on the surface 2 of the sea is comrised of a floating deck 11, front and rear end side walls 12, 13, light and left end side walls 14, 15 and a bottom 16 of a floating body. An internal wall 3 is positioned to be lower than the floating deck 11 by height (h), forming an internal partition chamber 4 between the decks 11. By forming the chamber 4 in floating-type construction 1, a pump 5 pumps up low temperature sea water from deep area, where is hardly susceptible of outside field, through a suction pipe 7, and the sea water is fed into the chamber 4 through a water feed pipe 8. The sea water is drained from a drain pipe to the outer field after cooling the floating deck and the like. Repeating such cycle, the temperature of the sea water contained within the chamber 4 is prevented from temperature increase even at the day time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cooling a floating structure and its mechanism.

[0002]

2. Description of the Related Art In recent years, various types of floating structure offshore structures have been proposed, planned or realized for the purpose of effective use of the ocean space due to the expansion of the range of utilization of science and technology. The floating structures that have been put into practical use so far are mainly steel, such as passenger terminals, oil berths (sea berths), and bridge foundations.

By the way, in the case of such a floating structure made of steel, the upper surface exposed to the sea receives radiant heat due to solar radiation, while the bottom surface is kept at seawater temperature.
In addition to the temperature difference in the height direction, there is also the problem that the structure repeatedly undergoes thermal deformation due to temperature changes during the day and night, but the size of the floating structure as described above is relatively large. Until now, it hasn't been a problem since many are not large.

However, when the floating structure is intended to be applied to an unprecedented large-scale structure such as a maritime airport, a distribution base, or a maritime city, heat generated by the above-mentioned temperature difference is used. There is a possibility that the problem of deformation may become large and surface. On the other hand, pavement on the surface of the floating structure may restrain the thermal deformation of the floating structure. Therefore, there is a concern that the stress level of the structural member of the floating structure may increase and the yield strength may decrease.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above, and it is possible to prevent thermal deformation or increase in stress even in a large scale. An object of the present invention is to provide a method of cooling a floating structure and a mechanism thereof.

[0006]

SUMMARY OF THE INVENTION The present invention is a method of cooling the exposed surface of a steel floating structure, wherein the floating internal compartment is provided close to the upper surface of the floating structure. The method for cooling a floating structure is characterized in that seawater is sent from one side wall and discharged from the other side wall facing the side wall.

Further, according to the present invention, a steel floating body deck (11) floating on the sea surface (2), front and rear end side floating body side walls (12, 13), left and right end side floating body side walls (14, 15), a floating body bottom ( A cooling mechanism for the exposed surface of a box-shaped floating structure (1) consisting of 16), which is defined by an internal bulkhead (3) provided at a predetermined height from the floating deck (11). Inside the floating body compartment (4) and the front and rear end side floating body side walls (12, 13) or the left and right end side floating body side walls (14, 1).
A pump (5) installed on either side of (5) for feeding seawater sucked in through the suction pipe (7) into the floating body internal compartment (4) through the water supply pipe (8); A drainage pipe (9) attached to the other surface facing one surface and discharging the seawater inside the floating body internal compartment (4) to the outside, and a floating structure characterized by the following: It is a cooling mechanism.

It is desirable to dispose a plurality of ribs on the inner surface of the floating body internal compartment (4) so as to coincide with the long side direction or the short side direction.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side sectional view showing an overall configuration of an embodiment of the present invention, and FIG. 2 is an enlarged perspective view showing the periphery of a pump. In these figures, 1 is a box-shaped floating structure that floats on the sea surface 2, and is composed of a floating deck 11, front and rear end side floating body side walls 12, 13, left and right side floating body side walls 14, 15, and a bottom surface 16 of the floating body. It Reference numeral 3 denotes an internal partition wall provided below the floating body deck 11 by a height h, and defines an internal floating body compartment 4 with the floating body deck 11. A pump 5 is installed on the pedestal 6 and sucks up seawater, for example, an underwater type or a self-priming type is used. Reference numeral 7 denotes a suction pipe whose suction port 7a is located at a predetermined water depth, and 8 denotes a front end side floating body side wall 12 of seawater sucked up by the pump 5.
The water supply pipe that feeds into the floating body compartment 4 through the hole 17 of
In both cases, stainless steel or other stainless steel is used. Reference numeral 9 denotes a drain pipe made of stainless steel or the like for discharging the seawater inside the floating body inner compartment 4 to the outside, which is joined to the hole 18 of the rear end side floating body side wall 13.

By thus defining the floating body internal compartment 4 in the floating structure 1, the pump 5 sucks low-temperature seawater from the depth region not affected by the external environment via the suction pipe 7. , The floating inner chamber 4 through the water supply pipe 8
Seawater is sent inside to cool the floating deck 11 and the like, and then discharged from the drain pipe 9 to the outside. By repeating this, for example, it is possible to suppress the temperature rise of the seawater in the internal compartment 4 of the floating body during the daytime, so that it is possible to reduce the temperature difference of the floating deck 11 exposed from the sea surface. It is possible to suppress thermal deformation or increase in stress level of the floating structure 1 due to this temperature difference.

If the pump 5 is covered with a cover 51 as shown in FIG. 3, adhesion of seaweed and oysters in the sea can be prevented. Further, if an elevating device 52 for elevating the pump 5 covered with the cover 51 is provided, when a trouble occurs in the pump 5, the pump 5 can be pulled up to the sea surface and repaired or the like can be performed on land. In addition, the size of the internal compartment 4 of the floating body is determined by the thermal energy received by the surface of the floating structure 1 and the surface area of the floating deck 11 where heat is transferred. It is expected that the size of the compartment 4 will be limited,
It is also conceivable to divide the floating body internal compartment 4 into a plurality of parts and use a plurality of pumps together. Therefore, in that case, as shown in FIG. 4, the floating body deck 11 and the left and right end side floating body side walls.
L-shaped ribs 10 can be attached to the inner surface of the inner surfaces 14 and 15 to increase the contact area with seawater. If the rib 10 is attached from the time of design, it is possible to reduce the size of the internal compartment 4 of the floating body.

In the above example, the water supply pipe 8 is joined to the hole 17 of the front end side floating body side wall 12, and the drain pipe 9 is joined to the hole 18 of the rear end side floating body side wall 13. Not limited to this, for example, water may be supplied from one of the left and right end side floating body side walls 14 and 15 and drained from the other side.

[0013]

[Example] The required size of the internal compartment of a floating body is an example of a case where a floating structure with a length of 5000 m, a width of 1000 m and a height of 6 m is suspended in the Sea of Japan near Matsue at a latitude of 35 ° north. And the pump capacity. According to the science chronology, the average temperature in Matsue in July is 25.2 ℃, and the direct solar radiation is 0.83.
kW / m ² .

Therefore, when it was attempted to control the surface temperature of the floating structure to 27 ° C. using seawater having a water temperature of 20 ° C., it was found that 14 pumps with a water supply capacity of 10 m ³ / sec should be installed. . In this case, it is not necessary to separately provide a rib on the inner surface of the inner space of the floating body.

[0015]

As described above, according to the present invention,
Since the low temperature seawater sucked from the sea was poured into the internal compartment of the floating structure made of steel to remove heat, the exposed surface part of the floating structure and the bottom part immersed in seawater The fluctuation of the temperature difference can be suppressed, and thus the thermal deformation of the floating structure can be suppressed.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an overall configuration of an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing the periphery of a pump used in the present invention.

FIG. 3 is a perspective view showing an installed state of a pump used in the present invention.

FIG. 4 is a perspective view illustrating an arrangement state of ribs inside a floating body compartment.

[Explanation of symbols]

 1 Floating structure 2 Sea surface 3 Internal partition wall 4 Floating body internal compartment 5 Pump 6 Frame 7 Suction pipe 8 Water supply pipe 9 Drain pipe 10 Rib 11 Floating body deck 12 Front side floating body side wall 13 Rear end side floating body side wall 14 Left end side floating body side wall 15 Right side floating body side wall 16 Floating body bottom 17, 18 Holes 51 Cover 52 Lifting device

Claims (3)

[Claims] 1. A method of cooling an exposed surface of a floating structure made of steel, comprising: cooling water from one side wall of an internal compartment of a floating body provided close to an upper surface of the floating structure. Is sent in and discharged from the other side wall opposite to the side wall. 2. A steel floating deck (1) floating on the sea surface (2).
1), front and rear end side floating body side walls (12, 13), left and right end side floating body side walls (14,
15), box-shaped floating structure (1) consisting of the bottom surface (16) of the floating body
A cooling mechanism for the exposed surface of the floating body internal compartment (4) defined by an internal bulkhead (3) provided at a predetermined height from the floating deck (11),
The front and rear end side floating body side walls (12, 13) or the left and right end side floating body side walls
Installed on either side of (14, 15), suction pipe
(7) A pump (5) that feeds seawater sucked in through the water supply pipe (8) into the floating internal compartment (4), and is attached to the other surface facing the one surface, A drain pipe (9) for discharging the seawater in the floating body internal compartment (4) to the outside world;
A cooling mechanism for a floating structure, comprising: 3. The floating structure according to claim 2, wherein a plurality of ribs are arranged on the inner surface of the floating inner compartment (4) so as to coincide with the long side direction or the short side direction. Cooling mechanism.