JPH0645924B2 - Offshore structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a marine structure that can be widely used as a marina, a surfing base, and eventually as a harbor stadium.

(Prior Art) Offshore structures are subject to meteorological effects, scientific and physical effects of seawater, and mechanical effects such as shock from waves and wear from floating objects, and are generally much more severe than land-based structures. Exposed to environmental conditions.

In addition, construction of offshore structures is carried out under extremely severe weather conditions, and is carried out far away from the land, which makes it protracted and difficult.

By the way, at present, various types of offshore structures are being constructed, but none of them have advantages and disadvantages, and perfect ones have not yet been implemented, and there is still room for development.

The present invention was developed under such circumstances, and an object thereof is to provide a marine structure capable of shortening the construction period by prefabricating the construction and saving the labor of the construction.

(Means for Solving Problems) The present invention relates to an offshore structure that is widely used as a marina, a surfing base, etc., and floats on the sea composed of a cylindrical side wall and a spherically bulging bottom. It is a marine structure in which a plurality of sets of modules that are configured by connecting a plurality of basic units that can be connected in the front-rear direction and the left-right direction are connected in the front-rear direction and the left-right direction. A cylindrical hollow part with an open lower end is formed in the center, and the upper end of a column supported by the seabed is inserted into this hollow part, and high-pressure air can be supplied or released at the upper end of the hollow part and the column. The above object is achieved by forming the pressure chamber.

(Embodiment) Hereinafter, the present invention will be described with reference to an embodiment, and FIGS. 1 to 3 show the entire offshore structure.
The offshore structure 1 is configured by floating a plurality of modules 2, ... In the front-rear and left-right directions according to the scale and use while floating on the sea, and supporting each of the modules 2 ,. ing.

In principle, the offshore structure 1 can be floated by buoyancy, and the columns 3, 3 are designed to resist only lateral pressure such as wave force.

In addition, a part of the weight of the offshore structure is to be borne by the columns 3 and 3.

Each module 2 is composed of a plurality of basic units 4, ... And an outer surface protection unit 5 ,. The basic unit 4 is formed in the shape of a rectangular parallelepiped box having a length of about 10 m from one side and a depth of about 5 m, and can be easily floated (see FIG. 8).

Further, the bottom portion of the basic unit 4 is formed so as to bulge downward in a spherical shape, and has a structure that resists water pressure by utilizing an arch effect.

Therefore, since not a bending stress but an axial force is generated at the bottom of the basic unit 4, it is not necessary to make the bottom of the basic unit 4 thicker in consideration of water pressure.

The shape of the basic unit 4 is not limited to a planar shape or a square shape, but may be a hexagonal shape (see FIG. 6), a circular shape (see FIG. 7), or the like.

The module including the hexagonal basic unit 4 has a honeycomb structure, which is extremely advantageous in terms of strength.

The basic unit 4 is made of steel plate, reinforced concrete prestressed concrete, or the like.

The basic unit 4 formed in this way is installed on the sea while abutting the necessary number of front-back and left-right directions according to the scale of the module 2 to be constructed, and each of them is pressure-differentially pressure-bonded or a plurality of connected units are connected. The bolts 12 and 12 are connected by bolting or the like (see FIG. 15) to form a module 2 of a predetermined scale. A water shut-off chamber 6 and a water drain hole 7 leading to the water shut-off chamber 6 are provided between the basic units 4 and 4, and a water shut-off material 8 such as an O-ring is filled in the upper end of the water shut-off chamber 6 to stop the joint. Water quality is improved. At the time of connection, the joint portion is filled with the water blocking material 8 and the connection bolts 12 and 12 are fastened.

Then, the seawater in the water stop chamber 6 is drained from the water drain hole 7.
As the seawater is drained, a force corresponding to the water pressure is applied to the joint surface, so that the degree of adhesion is increased and the waterproofness is improved. Of the basic units 4, ..., The basic unit 4 attached to each corner of the module 2 is formed with a hollow portion 9 having a vertically continuous cylindrical shape and having a lower end opened.
Then, the upper end of the column 3 is inserted into the hollow portion 9, and the upper end of the hollow portion 9 serves as a pressure chamber 9a. Pressure chamber 9a
A compressor 10 is connected to the. In addition, an O-ring or the like 1 for preventing leakage of air and water is provided on the inner peripheral wall of the hollow portion 9a for the purpose of sealing a gap between the inner peripheral wall of the hollow portion 9a and the column 3.
1, 11 are attached. Further, an accumulator 9b is connected to the pressure chamber 9a.

In such a structure, the compressor 10 constantly supplies the high-pressure air into the pressure chamber 9a or discharges the high-pressure air from the pressure chamber 9a so that the basic unit 4 and thus the module 2 can be freely moved up and down. Has become.

Further, by supplying high pressure air into the pressure chamber 9a from the accumulator 9b, the basic unit 4 can be pushed up to a predetermined level in a short time. Furthermore, the high-pressure air in the pressure chamber 9a serves as a shock absorber when the basic unit 4 moves up and down.

Therefore, each module 2, ... and by extension the marine structure 1
By appropriately increasing / decreasing the amount of high-pressure air in each pressure chamber 9a to change the level of the offshore structure 1, it is possible to prevent sway and promptly deal with tide level fluctuations and abnormal situations.

Further, similarly, the inclination of the offshore structure 1 and the unevenness of the seabed after construction can be easily absorbed.

Furthermore, if the lateral pressure is abnormally high due to a storm, etc.,
It is also possible to temporarily float the entire offshore structure 1 above the surface of the sea to avoid large lateral pressure.

Although the marine structure 1 receives a lateral pressure due to wave force, it has a structure that resists the lateral pressure at the upper end portion of the support column 3, so that the leakage water leakage prevention device for the O-rings 11, 11, etc. And the column play restriction device 14 is attached to the upper and lower two stages.

Furthermore, the support column 3 is configured to be freely replenished depending on the water depth.

Each of the modules 2 constructed in this way is towed to the installation sea, arranged side by side in the front, rear, left and right, and installed on the sea, and then connected by bolting or the like to form the marine structure 1. .

The modules 2, ... Are supported on the seabed by the columns 3,3.

When the seabed is soft, ground improvement should be carried out in advance or the ground seat 13 should be installed to secure the ground strength (see Fig. 16).

Outer surface protection units 5, ... Are attached to each basic unit 4 on the outer circumference of the marine structure 1 over the entire circumference of the marine structure 1.

The outer surface protection unit 5 is formed in a substantially arcuate shape in cross section, and has a lower end closed.

Further, the outer surface protection unit 5 is bolted to the side portion of each basic unit 4 by the same method as the method of joining the basic units 4 and 4 (see FIG. 15).

The outer surface protection unit 5 is a ship, a floating object, or
It is installed as a countermeasure against collision when berthing, and can be replaced as appropriate depending on the damage situation.

The outer surface protection unit 5 is made of steel plate, reinforced concrete or prestressed concrete, like the basic unit 4.

(Effects of the Invention) Since the present invention is configured as described above, it has the following effects.

Since a plurality of basic units are connected in the front / rear / left / right directions to form a module and the modules are connected in the front / rear / left / right directions, prefabrication of the construction is possible. Along with this, the construction period has been greatly shortened,
Labor saving in construction can be achieved.

Therefore, it is possible to safely perform offshore construction, which is likely to be construction under severe conditions, in a short period of time.

[Brief description of drawings]

1 to 16 show an embodiment of the present invention. FIG. 1 is a perspective view of a marine structure, FIG. 2 is a plan view thereof, and FIG. 3 is a side view thereof. 4 is a plan view of the module, FIG. 5 is a plan view thereof, FIGS. 6 and 7 are plan views of the module, and FIG. 8 is a perspective view of a basic unit.
FIG. 9 is a plan view of the basic unit and the outer surface protection unit, FIG. 10 is a cross-sectional view thereof, FIG. 11 is a cross-sectional view of an upper end portion of a support pile, and FIG. 13 and 14 are schematic views of a dock for manufacturing a basic unit, FIG. 14 is a partial sectional view of a module, and FIG. 15 is
FIG. 14 is an enlarged cross-sectional view of a main part in FIG. 14 showing a joined state of the basic units, and FIG. 16 is a side view showing a supported state of the module. 1 ... Offshore structure, 2 ... Module, 3 ... Struts, 4 ... Basic unit, 5 ... Outer surface protection unit, 6 ... Water stop room, 7 ...
Water drainage hole, 8 ... Water blocking material, 9 ... Hollow part, 10 ... Compressor, 11 ... O-ring, 12 ... Bolt, 13 ... Gear seat, 1
4 Play limiter.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Yamanobe 2-19-1, Tobita-cho, Chofu-shi, Tokyo Inside Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Kosuke Furuichi 2-1-1-1, Tobita-cho, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (56) Reference JP-A-53-43394 (JP, A)

Claims (1)

[Claims] 1. A plurality of modules in the front-rear and left-right directions, each of which is composed of a plurality of basic units which are composed of a cylindrical side wall and a bottom portion which bulges in a spherical shape and which can float on the sea, and which are connected in the front-rear and left-right directions. An offshore structure in which a set is connected, and a basic unit provided with a pillar among the basic units is formed with a cylindrical hollow portion with a lower end opening at the center, and a pillar supported on the seabed in this hollow portion. The marine structure is characterized in that a pressure chamber capable of supplying or releasing high-pressure air is formed between the upper ends of the hollow portion and the column by inserting the upper end portion of the.