JPH06144362A - Semisubmersible type float structure - Google Patents

Abstract

PURPOSE:To effectively damp shaking a deck by eliminating a direct influence by waves. CONSTITUTION:Tubular outer columns 2, protruded above a level of the seawater WL, are respectively vertically provided in a plurality of the first lower hulls 1 floated in the sea, to fill the inside of these outer columns 2 with the seawater also to liftably arrange inner columns 4 having the second lower hull 3 in the bottom end part, and an upper deck 5 is provided over between upper end parts of these inner columns 4, to provide damping water chambers 8, which sucks/discharge the seawater in the outer column 4 through a suction/ discharge port 9 by lifting the second lower hull 3, in a lower part of the outer column 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a floating structure such as a floating jetty, a floating airport, and various barges used in coastal areas, in which a column is erected from the bottom floating body (lower hull) floating in the sea to the sea surface. The present invention relates to a semi-sub body type floating structure in which a deck is projected and a deck is provided at the upper end of the column.

[0002]

2. Description of the Related Art In a floating structure such as a barge or oil rig where workability and work safety are important, a semi-sub type floating structure with a waveless column is built in order to suppress its swinging. There is.

[0003]

However, even in the case of a semi-submersible type floating structure with a waveless column, the column which is the main structure is apt to be shaken directly by the influence of waves. .

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a semi-submersible type floating structure which is less susceptible to the influence of waves and can suppress the shaking of the deck.

[0005]

In order to solve the above problems, a semi-submersible type floating structure of the present invention has a plurality of first bottom floating bodies floating in the sea each having a cylindrical outer column protruding above the sea surface. Stand upright, fill the outer column with seawater, and arrange the inner column having the second bottom part floating body at the lower end so as to be able to move up and down, provide a deck between the upper ends of these inner columns, and at the bottom of the outer column, A buffer water chamber is provided for sucking and discharging the seawater in the outer column through the suction and discharge ports by raising and lowering the second bottom floating body.

[0006]

In the above structure, the load due to waves is first applied to the outer column and the first bottom floating body, and then to the second bottom floating body and the inner column, so that the vertical impact force can be effectively damped. , The seawater that is compressed or expanded in the buffer water chamber by the lifting and lowering of the second bottom floating body is discharged or sucked from the supply / discharge port, so that the kinetic energy is effectively absorbed and the shaking of the deck is effectively suppressed. You can

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a semi-sub type floating structure according to the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a plurality of first lower hulls (first bottom floating bodies) suspended in the sea, and a cylindrical outer column 2 having an upper end protruding above the sea surface WL is provided upright. The outer column 2 is filled with seawater, and an inner column 4 having a second lower hull (second bottom floating body) 3 attached to the lower end is arranged so as to be able to move up and down, and an excavator is provided between the upper ends of the inner column 4. A deck 5 that serves as a workbench for mounting etc. is attached.

A pair of guide rails 6 along the length direction are attached at symmetrical positions on the inner surface of the cylindrical outer column 2, while guide rollers 7 guided by the guide rails 6 are provided on the side portions of the second lower hull 3. It is installed. Further, the lower portion of the second lower hull 3 in the outer column 2 is configured as a buffer water chamber 8, and the lower portion of the outer column 2 is formed with a plurality of intake / drain ports 9 communicating with the open sea.

Therefore, as shown in FIG. 3, in each of the outer column 2 and the inner column 4 which relatively move up and down under the force of waves or the like, when the second lower hull 3 moves in the vertical direction, the inside of the buffer water chamber 8 The seawater is compressed or expanded and discharged or sucked through the intake / exhaust port 9. Due to the resistance at this time,
The kinetic energy is absorbed, the vertical movement of the second lower hull 3 is buffered, and the swing of the deck 5 is suppressed.

[0011]

As described above, according to the present invention, the double column eliminates the direct influence of waves, and the vertical movement energy of seawater in the buffer water chamber is absorbed from the discharge port. It is possible to absorb by sucking or discharging to buffer the rise and fall of the inner column and effectively suppress the shaking of the deck.

[Brief description of drawings]

FIG. 1 is a partial front sectional view showing an embodiment of a semi-submersible type floating structure according to the present invention.

FIG. 2 is a side partial cross-sectional view of the semi-sub type floating structure.

3A and 3B are side views showing an operating state of the semi-sub type floating structure.

[Explanation of symbols]

 1 1st lower hull 2 Outer column 3 2nd lower hull 4 Inner column 5 Deck 6 Guide rail 7 Guide roller 8 Buffer water chamber 9 Suction / discharge port WL Sea surface

Claims (1)

[Claims] 1. A cylindrical outer column projecting above the sea surface is erected on each of a plurality of first bottom floating bodies floating in the sea, and the outer column is filled with sea water and at the lower end thereof a second column is provided.
An inner column with a bottom floating body is arranged so that it can be moved up and down, a deck is provided between the upper ends of these inner columns, and the seawater in the outer column is sucked and discharged through the suction port through the lowering of the second bottom floating body under the outer column A semi-submersible type floating structure, which is provided with a buffer water chamber.