JPH0433923B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for installing a plant unit using a barge, which can be applied to a plant unit that is installed at a destination after being transported by sea.

[Prior art]

This type of plant unit is transported by sea and then installed at its destination location.

When installing this plant unit, in the case of a bottom-mounted plant unit in which the bottom of the plant unit is grounded, the plant unit must be towed into a pond that has been dug in advance at the installation location and communicates with the sea. The conventional general method is to load ballast inside the unit and allow the weight of the ballast to cause the plant unit to settle on the bottom of the pond. There was a problem in that it took a long time to charge and load, and it also took a long time to backfill the pond around the plant unit.

In addition, in the case of a fixed leg type plant unit in which the plant unit itself is equipped with fixed legs that reach the seabed, when installing this plant unit, the bottom of the plant unit must be held against the fixed legs that have landed on the seabed. Since a powerful jack-up device is required to raise the plant to an installation position close to the sea surface, there is a problem in that the manufacturing cost of the entire plant unit increases due to the installation of this powerful jack-up device.

[Purpose of the invention]

The present invention was devised in view of the above-mentioned conventional situation and to eliminate the drawbacks. The object of the present invention is to provide a method for installing a plant unit using a barge, which can be easily installed at a location.

[Structure of the invention]

One of the methods of installing the plant unit using a barge according to the present invention that achieves the above object is to set the bottom installation point of the plant unit mounted on the barge at a height near the normal tide level due to the barge rising with high tide. the installation position, and then
The plant unit is characterized in that after the bottom side installation location of the floating plant unit is brought to the bottom by the descent of the barge which descends due to low tide, the barge is moved away from the bottom surface of the plant unit.

Furthermore, another method involves transporting a plant unit equipped with fixed legs to the installation position by a barge, then standing the fixed legs on the installation position, and then using high tide to move the plant unit to the fixed position. The barge is characterized in that it is raised along the legs and then fixed in that position, and then the barge is moved away from the bottom of the plant unit using low tide.

〔Example〕

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

FIG. 1 is an installation process diagram showing a method of installing a plant unit using the bottoming method in the order of A to E.

The plant unit 1 shown in Fig. 1A is installed on a semi-submersible barge 2 (hereinafter referred to as barge) and
It is waiting on the sea surface 4 near the destination installation position 3 shown in Figure B.

In this plant unit 1, the bottom side installation point S set on the bottom surface 1a of the plant unit is located on the barge 2.
It is mounted on barge 2 with its side exposed. In other words, the width h of the barge 2 is, as shown in Fig. 1E, when the bottom installation points S are set on both sides of the plant unit 1.
The bottom installation points S on both sides of the plant unit, which protrude outside the width H of the barge 2, are exposed from the sides of the barge 2. A bottom side installation point S protruding from the bottom side is configured to land on a pair of installation pedestals 6 facing each other at an installation position 3 to be described later, or on one of the quay walls 7 paired with each installation pedestal 6.

On the other hand, on the seabed 5, a plurality of installation frames 6, 6... extending to an installation height near the sea surface 4 and forming pairs are provided at predetermined intervals, or each installation frame is arranged in a row on the other side. A quay 7 on one side that is paired with the pedestal 6
are provided in advance, and an installation position 3 set at a height near the sea surface 4 formed by these installation frames 6 or quays 7 is provided.

Next, as shown in FIG. 1B, the plant unit 1 is placed on the bottom side of both sides of the plant unit 1 mounted on the barge 2 while the barge 2 is floating, which rises with the high tide when the seawater level rises. Taking advantage of the fact that the installation point S is higher than the normal tide level, the plant unit 1 is mounted on each installation pedestal 6 that is installed together with the barge 2 at a position higher than the sea level 4 at the normal tidal level, or to the installation pedestal 6. It is moved forward to the installation position 3 on the quay wall 7 forming a shape.

The plant unit 1, which floats above the installation position 3 in this high tide state, takes advantage of the low tide state of the seawater that occurs after a predetermined time to move onto the installation pedestal 6 or onto the installation pedestal 6.
The ship will land on the quay 7 that is paired with the ship. In other words, as shown in Fig. 1C, the bottom installation points S on both sides of the plant unit 1 are installed at a height near the sea level 4 by the barge 2, which descends as the seawater descends at low tide. It will land on the upper surface of the pedestal 6 or the quay 7.

At this time, barge 2 that had lowered plant unit 1
In this case, the water becomes shallow enough to correspond to the loaded weight of plant unit 1, and the barge 2 floats to the surface. This can also be prevented by using a transport barge with a seawater ballast structure.

After the plant unit 1 reaches the bottom, as shown in FIG. to separate from

In order to further speed up the landing of the plant unit 1 on the bottom and the departure of the barge 2, it is possible to install the plant unit 1 in which the bottom side installation point S is located above each installation frame 6 or quay wall 7 at high tide, as in the previous example. As shown in another example in Fig. 2, the semi-submerged barge 2 is forcibly submerged so that it reaches the bottom first, and after the plant unit 1 has reached the bottom, the forcibly submerged barge 2 is moved backward. By doing so, the plant unit 1 can be brought to the bottom in a shorter time without having to wait for a long time for the tide level to be low.

In addition, as shown in the other example in Fig. 3, in places where the tidal level difference is large, even if the plant unit 1 is mounted on a small barge 2 and the bottom installation point S is located at a relatively low position with respect to the sea surface. By taking advantage of the tidal level with a large tidal difference, the plant unit 1 can be installed on both sides of the plant unit 1 within the steps facing each other inwardly provided at the top of each installation frame 6a at the installation position 3 or the quay wall 7a paired with the installation frame 6a. It is also possible to attach the bottom side installation point S to the bottom.

Furthermore, as shown in another example in FIG. Bottom side installation point S
By utilizing the fact that the plant unit 1 is mounted on the barge 2 in an exposed state, the plant unit 1 can be installed on the land 8 by utilizing the tidal difference as in the previous example.

Furthermore, as shown in another example in FIG. A fork-shaped dedicated barge 10 with spaces L on the left and right sides on the width line G is manufactured, and the plant unit 1 has an installation point S on the bottom side of the plant unit formed by the space L of the barge 10 on the top surface of the barge 2. Utilizing the fact that it is mounted on the barge 10 in a state that is more exposed than the mounting surface, the plant unit 1 can be installed by utilizing the tidal level difference as in the previous example.

In the present invention, when the plant unit 1 is mounted on a small barge 2 with low buoyancy, the bottom side installation point S of the plant unit 1 with respect to the sea surface 4 is
Although it is possible to lower the center of gravity of the plant unit 1 during towing by lowering the position, it is possible to move the bottom installation point S of the plant unit 1 to sea level in an extremely short time by taking advantage of the tidal level difference. When the plant unit 1 is mounted on a large barge 2 with high buoyancy, the bottom installation position S position of the plant unit 1 relative to the sea surface 4 can be installed at a height close to 4. by raising the height of the barge 2 and taking advantage of the tidal difference
Since it can be installed in a short time at the installation position 3 which is higher than the height using In some cases, the plant unit is installed by letting the bottom of the plant unit touch the bottom of the pond. This solves the problem of requiring a period of time to backfill the area around the plant unit.
The installation period for the plant unit can be significantly shortened because it can be placed on the bottom at an installation position near the sea surface by rising and falling using the tidal difference.

Further, FIG. 6 is an installation process diagram showing a method of installing a plant unit using a fixed leg method in which a plurality of fixed legs 11 are installed in the order of A to D. The plant unit 1 shown in FIG. 6A is equipped with a plurality of fixed legs 11 installed vertically at a position corresponding to the bottom installation point S shown in the previous example.
The plant unit 1 mounted on the barge 2 is moved directly to the sea surface above the installation position 3 without waiting on the sea surface near the destination installation position 3,
The fixed legs 11 are lowered toward the seabed 5, and the lower end of each fixed leg 11 is fixed after landing on the low-height installation frame 12, and the plant unit 1 and the fixed legs 11 are fixed.
Wait for the high tide of the sea water with the fixation released.

As shown in FIG. 6B, the plant unit 1 is fixed to the fixed leg 11 at the highest position of the barge 2, which rises with the high tide of seawater where the tide level gradually becomes higher than the normal sea level. The plant unit 1 is installed at an installation position 3 with its bottom side installation point S at a position higher than the sea level 4 at the normal tide level.

Next, as in the previous example, either take advantage of the low tide and lower tide level, or use the barge 2
By forcibly sinking the barge 2, the barge 2 is moved away from the bottom surface 1a of the plant unit 1 at the installation position 3, as shown in FIG. 6C.

In this case, as shown in FIG. 6D, a barge 2 having a width h smaller than the inner facing interval W of the fixed legs 11 is used.

The fixed leg type shown in Fig. 6 is
As shown in FIG. 7, which shows an application example of FIG. It can also be applied to a device that is configured to touch the bottom of a quay 7 or the like that is paired with the pier.

Therefore, in the case of the fixed leg system according to the present invention, unlike conventional plant units, a strong force is used to raise the bottom of the plant unit to the installation position near the sea surface, with respect to the fixed legs that are placed on the seabed. It is possible to solve the problem that a jack up device is required and the manufacturing cost of the entire plant unit increases due to the installation of this powerful jack up device.

〔Effect of the invention〕

As described above, the present invention uses the ebb and flow of the tide to allow the plant unit to land on the bottom at an installation position near the normal tidal level, making it possible to install the plant unit inexpensively and easily. Now I can install it.

In addition, if a fixed leg type plant unit is fixed at the high tide position using high tide, there is no need for a jack up device, which reduces manufacturing costs and has the advantage of eliminating the need for power when jacking up. .

[Brief explanation of drawings]

The drawings show one embodiment of the invention,
Figures 1A to 1E are installation process diagrams of the plant unit using the bottoming method; Figure 1A is a side view showing the plant unit mounted on the barge;
Figure B is a side view showing the plant unit moved to the installation position, Figure 1C is a side view showing the plant unit on the bottom, Figure 1D is a side view showing the movement of the barge, and Figure 1E is the side view showing the plant unit in its bottom position. 1D is a sectional view taken along the line X-X in FIG. 1D. Figures 2 to 5 show other embodiments, with Figure 2 being a side view showing the plant unit landing on the bottom due to forced subsidence of the barge, and Figure 3 being a front view showing the plant unit landing on the bottom. FIG. 4 is a plan view showing how the plant unit is installed in a pond on land, and FIG. 5 is a plan view showing how the plant unit is installed by a fork-shaped barge. 6th
Figures A to D are installation process diagrams of the plant unit using the fixed leg system, where Figure 6A is a side view showing the plant unit mounted on the barge, and Figure 6B is the plant unit moved to the installation position. FIG. 6C is a side view showing movement of the barge;
FIG. 6D is a sectional view taken along the Y-Y line in FIG. 6C.
FIG. 7 is a front view showing another example of FIG. 6D. 1...Plant unit, 2...Barge, 3...
... Installation position, 4 ... Sea surface, 5 ... Seabed, 6 ... Installation frame, 7 ... Quay, S ... Bottom side installation point, 11
...Fixed legs.

Claims (1)

[Claims] 1. The bottom installation location of the plant unit mounted on the barge is floated above the installation location, which is normally set at a height near the tide level, by the barge rising at high tide, and then the floated plant unit is A plant unit using a barge, characterized in that the bottom installation point of the unit is brought to the bottom by the descent of the barge that descends due to low tide, and then the barge is moved away from the bottom of the plant unit. Installation method. 2. After transporting the plant unit equipped with fixed legs to the installation position by a barge, the fixed legs were stood on the installation position, and then the plant unit was raised along the fixed legs using high tide. A method for installing a plant unit using a barge, characterized in that the barge is then fixed in that position, and then the barge is moved away from the bottom of the plant unit using low tide.