JPS60144411A - Offshore installation of plant unit - Google Patents

Abstract

PURPOSE:To reduce the cost of construction work by simply landing a plant unit on the seabed by a method in which the plant unit is floated close to the sea surface 7 by buoyancy of compressed air put into an air bag, and the unit so floated is installed at a given position on the sea. CONSTITUTION:The whole of a plant unit 1 is floated close to the sea surface 7 by the buoyancy of compressed air put into an air bag 5. The plant unit 1 in the floated state is wholly towed to a given installing position, and compressed air is discharged from the air bag 5 to install the unit 1 on plural installing bases 4 fixed to the seabed 8 near a quaywall 6. The air bag 5 is then removed out. The unit 1 can thus be simply installed on the sea without taking much time for charging of ballast, and the cost of all the plant unit can be cut down.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for installing a plant unit at sea in a fixed position on the sea by using a bottom landing or fixed leg method to install a plant unit floating on the sea. It is.

[Prior art]

This type of plant unit, which is installed on the seashore using the bottom-mounted or fixed-leg method, is constructed by transporting the floating plant unit by sea and then installing it on the sea at a predetermined position using the bottom-mounted (1) or fixed-leg method. It has become.

During this installation, if the plant unit is a bottom-mounted type, a pond is prepared in advance at a fixed position, and after the plant unit is pulled into the fixed position pond, ballast is loaded inside the plant unit, and the ballast is loaded into the plant unit. Generally, the plant unit is installed by landing on the bottom due to the weight of the plant unit, which poses a problem in that it takes a lot of time to load and load ballast inside the plant unit.

In addition, for fixed leg type plant units that have fixed legs that can move up and down to reach the seabed, after moving to the installation location at sea, the plant unit is floated close to the sea surface using the fixed legs that are lowered to the seabed. The problem was that the jacking device for raising and lowering the fixed legs of the plant had to be extremely powerful, and the cost of the entire plant unit increased significantly in order to install this powerful jacking device.

(2) [Object of the Invention] The present invention was devised in view of the above-mentioned conventional situation and to eliminate the drawbacks thereof. It is an object of the present invention to provide a method for installing a plant unit at sea, which allows the plant unit to be easily installed in a fixed position by floating it on the water.

[Structure of the invention]

A method for installing a plant unit at sea according to the present invention that achieves the above object is such that a gas bag is disposed at the bottom of a plant unit floating on the sea, and the buoyancy of the compressed gas filled in the gas bag causes the plant unit to be installed at sea. The system is characterized in that the plant unit is floated near the sea surface and the floated plant unit is installed at a fixed position on the sea.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, drawings showing the present invention as an embodiment will be described.

FIG. 1 shows a bottom-attached plant unit, and as shown in the side view of FIG. Left and right partition plates 2.2 and front and rear partition plates 3.3 are fixed in a hanging manner to prevent the gas bag 5 from coming out. As shown in the front view of FIG. 1(B), a plurality of gas bags 5, 5, etc. are arranged at the bottom 1a of the plant unit 1, and each gas bag 5 is connected to a gas compression device (not shown) installed in plant units 1 to 1 by a connecting vibrator (not shown), and compressed gas can be simultaneously supplied and discharged to each gas bag 5 or individually supplied to a specific gas bag 5. It is now possible to remove it. In addition, in the drawing, partition plates 2 and 3 are provided on the left and right and front and rear, but partition plate 2
It is desirable that a plurality of gas bags 5 and 3 are provided in accordance with the length or width of each gas bag 5 as shown in the drawing.

Then, compressed air is supplied from the gas compression device to each gas bag 5, and as shown in the side view of FIG. 1(A), the plant unit l-1 is
The entire plant unit 1 is floated so that its bottom portion 1a is close to the sea level (4), and the entire floating plant unit 1 is towed to a fixed installation position as shown in FIG. 1(B). When the plant unit 1 floats up, the ballast adjusts the left-right and front-rear balance.

Next, the plant unit 1 that has been towed to the fixed installation position is fixed to the seabed 8 near the quay 6 in advance by removing the compressed gas from each gas bag 5, as shown in FIG. 1(C). It can be installed on multiple installation stands 4°4... Then, by removing each gas bag 5 from which compressed gas has escaped from the bottom 1a of the plant unit 1 installed on the installation frame 4.4, the plant unit 1 is installed as shown in FIG. 1(D). Can be installed at sea.

Therefore, as in the conventional bottoming method, a pond is provided in advance at a fixed position, and after being drawn into the fixed position pond, ballast is loaded inside the plant unit, and the plant unit is brought to the bottom by the weight of the ballast. (5) The problem that it takes a lot of time to load and load ballast can be solved and it can be easily installed at sea.

The other side shown in FIGS. 2(A) to 2(C) shows the case of a fixed leg type plant unit 1 having fixed legs 9 that can move up and down to reach the seabed '8. As shown in the front view of FIG. 2(A), there are partitions on the left and right sides of the bottom 1a of the plant unit 1 floating on the sea to prevent the gas bag 5 from being removed. A plate 2.2 and front and rear partition plates 3.3 are fixed in a hanging manner. gas bag 5゜5
..., and each gas bag 5 is connected to a gas compression device (not shown) installed in the plant unit 1 through a connecting pipe (not shown).

Then, the plant unit 1 supplies compressed air from the gas compression device to each gas bag 5 at the towed installation position, and as shown in FIG. 2(A), (6) each gas bag 5 The entire plant unit 1 is floated by the buoyancy of the compressed gas filled in the water so that its bottom 1a is close to the sea surface 7, and then the floating plant unit i.
A plurality of fixed legs 9.9... are lowered from above 1 toward the seabed 8 as shown in Fig. 2 (B), and by lowering the plurality of fixed legs 9.9..., a plan]- Unit 1 can be installed at sea. At this time, the gas bag 5 is not located partially in the region where the fixed legs 9, 9, . . . descend.

Next, the plant unit 1 installed in the fixed position is opened to the plant as shown in FIG. The unit 1 can be installed on a seashore using fixed legs 9.

Therefore, the fixed leg type plant unit 1 only needs to be equipped with a simple fixed leg lifting device that lowers the fixed leg 9. In order to raise the plant unit to near the sea surface using the fixed legs that are lowered to the seabed after being moved to a fixed position on the sea (7), it is necessary to make the jack-up device for lifting and lowering the fixed legs extremely strong. Therefore, it is possible to solve the problem that the cost of the entire plant unit increases significantly.

The gas bag 5 in the present invention is made of a recently developed strong bag used for removing sand from dams. Then, a strong gas bag 5 of this type is attached to each partition plate 2.
The floating plant unit 1, such as one that stores compressed air directly inside the partition plates 2 and 3, etc. of the bottom part 1a, is securely restricted to the bottom part 1a of the plant unit 1 so as not to move by 3 and 3. This prevents the risk of compressed air escaping when the plant unit 1 tilts slightly due to its equilibrium balance at sea, and the plant unit 1 can be safely floated.

〔Effect of the invention〕

In short, the method for installing a plant unit at sea according to the present invention involves disposing a gas bag at the bottom of the plant unit floating on the sea, and (8) buoyant force of the compressed gas filled in the gas bag to mount the plant unit. Since the floating plant unit is floated close to the sea surface and installed on the sea in a fixed position, the plant unit is lifted up by the buoyancy of the compressed gas filled in the gas bag installed at the bottom of the plant unit floating on the sea. It can be floated close to the sea surface, and the plant unit floated near the sea surface can be used to be installed at a fixed location on the sea.

Therefore, as in the conventional bottoming method, a pond is provided in advance at a fixed position, and after the plant unit is drawn into the fixed position, ballast is loaded inside the plant unit, and the plant unit is brought to the bottom by the weight of the ballast. This eliminates the problem of requiring a lot of time to load and load ballast inside the plant unit, making it easy to install at sea. Because it is only necessary to install a simple fixed leg lifting device that lowers the fixed leg, unlike the conventional fixed leg method,
By lowering the fixed legs to the seabed (9) In order to raise the replant unit to near the sea surface, the jack-up device for raising and lowering the fixed legs must be extremely powerful, which increases the cost of the entire plant unit. This can solve the problem of uploading to

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and are shown in FIG.
A) to (D) are installation process diagrams of a bottom-mounted plant unit, where Fig. 1 (A) is a side view showing the floating state, and Fig. 1 (B) is a front view showing the floating state at the installation position. 1(C) is a front view showing the plant unit in a sunken state at the installed position, and FIG. 1(D) is a front view showing the installed state with the gas bag removed. Figures 2(A) and 2(B) are installation process diagrams of a fixed leg type plant unit, where Figure 2(A) is a front view showing the floating state at the installation position, and Figure 2(B) is a FIG. 3 is a front view showing the installed state with the bag removed. 1... Plant unit, 4... Installation frame, 5...
・Gas bag, 7...Sea surface, 9...Fixed legs. (10) Figure 1 (A) / 7 Figure 1 (B) One Yoyo 〒Chi23.351a 6 3 One Yoyo; Figure 1 (C) 1 ' 5 5 4 d color ・ Figure 2 (A) Figure 2 (B) Di3,3)1a 2 λ

Claims (1)

[Claims] A gas bag is disposed at the bottom of the plant unit 1 floating on the sea, and the buoyancy of the compressed gas filled in the gas bag causes the plant unit to float near the sea surface, and the floating plant unit is brought to a fixed position on the sea. A method for installing a plant unit at sea.