JPS62152996A - Building method for heavy marine structure - Google Patents

Abstract

PURPOSE:To enable the launching of a heavy marine structure even if the width thereof is larger than that of a dock, by building main bodies on both the side quays of the dock, using a front and a rear cross coupling beams to couple the main bodies to each other, pulling a ship in under both the beams at the time of low tide, and utilizing the high tide to lift the main bodies. CONSTITUTION:Main bodies 1 are built on both the side quays of a dock 3. The front and rear portions of the main bodies 1 are coupled to each other by a front and a rear cross coupling beams 2 extending across the dock 3. A heavy marine structure is thus assembled. After that, a ship 10 is pulled into the dock 3 by utilizing the low tide or by ballasting. Both the cross coupling beams 2 are lifted by the upper deck of the ship 10 through the utilization of high tide or through ballasting, so that the ship is moved out of the dock 3 together with the heavy marine structure. The ship 10 is then slightly lowered in the sea by ballasting, to launch the heavy marine structure on the sea. The structure can thus be launched on the sea even if the width B of the structure is larger than that b of the dock 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] As shown in the perspective view of FIG.
This invention relates to a method of constructing a large rectangular marine structure formed by connecting rear parts with front and rear connecting cross beams 2, 2, respectively.

[Conventional technology]

Traditionally, when building offshore structures, it is common to build them in a dock until the structure is stable and floating on the surface of the water. However, the method of assembling the parts at sea has poor assembly accuracy (and the work is dangerous), so it is best to complete the work on the dock as much as possible.

However, when constructing a large offshore structure as shown in Figure 11, if the width B of the offshore structure exceeds the width of the dock, it is impossible to construct this structure inside the dock. .

[Problem that the invention seeks to solve]

The present invention was proposed in view of these circumstances, and even if the width of the structure is larger than the width of the dock, it can be built next to the dock, and after the main hull is completed, a normal ship can be placed at the dock. The object of the present invention is to provide a method for constructing a large marine structure that can be launched onto the ocean by docking the structure.

[Means for solving problems]

To this end, the present invention provides a large offshore structure in which the front and rear parts of a pair of left and right main hulls, which are arranged in parallel with a larger interval than the dock 1, are connected by a front connecting cross beam and a rear connecting cross beam, respectively. During the construction, the main hull was built on each side of the dock, and the front part of the main hull was built on each side of the dock.

The first step is to assemble a large offshore structure by connecting the rear parts with a front connecting cross beam and a rear connecting cross beam that cross the dock.
After pulling the ship into the dock using low tide or by ballasting and bringing it under the two connecting cross beams, using high tide or by ballasting, lifting the two connecting cross beams with the hull of the ship. , a second step in which the ship is docked with the large offshore structure and roof tiles, and a third step in which the large offshore structure is launched into the sea by slightly ballasting the ship at sea. It is characterized by a process.

[For production]

With this configuration, even if the width of the structure is larger than the width of the dock, it can be built next to the dock and a normal ship can enter the dock after the main hull is completed.
A method for constructing a large marine structure that can be launched onto the ocean can be obtained.

〔Example〕

An embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a perspective view showing the first step, and Fig. 2 is a perspective view showing a state in which a ship is pulled into the dock shown in Fig. 1 as part of the second step. Fig. 3 is a front view of Fig. 2, Fig. 4 is a perspective view showing the state at high tide, Fig. 5 is a front view of Fig. 4, and Fig. 6 is a front view of the state shown in Fig. 4. Figure 7 is a perspective view showing the state in which the ship is being dipped, Figure 8 is a front view of Figure 7, and Figure 9 is the state in which the ship is being pulled out by ballasting from the state shown in Figure 7. FIG. 10 is a perspective view showing a separated state, and FIG. 10 is a front view of FIG. 9. FIG. 11 is a perspective view showing the relationship between a known large offshore structure and a dock.

First, as the first step, as shown in Figure 1, a pair of left and right main hulls 1°1 are constructed on both quay walls of the dock, and the front and rear parts are connected together, respectively. Connect across the dock using cross beams 2 and 2.

The work up to this point can be carried out using existing cranes on both sides of the dock.

At Tomata, as shown in FIG. 2, a ship 10 capable of docking at the dock 3 is prepared, and a mount 12 is installed on the upper deck 11 in the white area of the connecting cross beams 2, 2 of the marine structure. that time,
13. Masts that may be a hindrance when docking. Remove deck cranes etc. in advance.

Next, as a second step, as shown in FIG. 2 and FIG. t, and when the distance from the bottom surface of the offshore structure to the contact surface of the connecting cross beam 2 with the frame 12 is d3, d, + d, ) d.

The ship will be docked when the following relationship holds true.

Then, as shown in FIGS. 4 and 5, the ship gradually rises to the surface as the tide rises.

Therefore, the ship is stopped at a horizontal position where the trestle 12 and the connecting cross beam 2 are aligned, and d2+d3 (d.

When this occurs, the marine structure floats up together with the ship, as shown in Figures 6 to 8, and the ship is allowed to leave the dock as is, as shown in Figure 9.

Finally, as shown in FIG. 10, by loading ballast on the ship 10 at sea, d, ) d.

Then, as shown in the figure, the marine structure floats to the surface, and the ship then moves away from the marine structure, thereby completing the launching of the marine structure.

In the above example, the ship carrying the offshore structure enters the dock at low tide and leaves the dock at high tide, but this is because when the ship is large, ballast is loaded on the ship to increase the water intake, and when the ship leaves the dock, the water is increased. can also be changed depending on the method of discharging the ballast.

〔Effect of the invention〕

In short, according to the present invention, a large offshore structure is constructed by connecting the front and rear parts of a pair of left and right main hulls, which are arranged in parallel with an interval larger than the dock 11, using a front connecting cross beam and a rear connecting cross beam, respectively. During construction, the first step is to build main hulls on both sides of the dock, and then connect the front and rear parts of the ships with the front and rear connecting crossbeams that cross the dock, respectively, to assemble a large marine structure. The ship was pulled into the dock using low tide or by ballasting and brought under the connecting cross beams, and after lifting both connecting cross beams with the ship's hull using high tide or by ballasting, a second step in which the ship is docked alongside the large offshore structure, and a third step in which the large offshore structure is launched into the sea by slightly ballasting the ship at sea. Therefore, even if the width of the structure is larger than the width of the dock, it can be built next to the dock and then launched at sea by docking a normal ship at the dock after the main hull is completed. The present invention is industrially extremely useful because it provides a method for constructing large offshore structures that can

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the first step of the present invention, and FIG. 2 is a perspective view showing the second step of the present invention.
Figure 1 is a perspective view showing the state in which a ship is pulled into the dock as part of the process, Figure 3 is a front view of Figure 2, Figure 4 is a perspective view showing the state at high tide, and Figure 5 is a Front view of Figure 4, No. 6
The figure is a perspective view showing the state in which the ship is docked from the state shown in Fig. 4, Fig. 7 is a perspective view showing the state in which the ship is pulled out to sea, and Fig. 8 is a perspective view showing the state in which the ship is docked.
The figure is a front view of Figure 7, Figure 9 is a perspective view showing the state in which the ship has been separated by ballasting from the state shown in Figure 7, and Figure 1 is a front view of Figure 7.
0 is a front view of FIG. 9. FIG. 11 is a perspective view showing the relationship between a known large offshore structure and a dock. 1... Main hull, 2... Connecting cross beam, 3... Dock,
10... Ship, 11... Upper deck, 12... Frame,
13...Mast B...During the eclipse of a large marine structure, b...Dock width, Figure 7, Figure 9, Figure 8, Figure 70. ) 宕

Claims (1)

[Scope of Claims] To construct a large marine structure in which the front and rear parts of a pair of left and right main hulls, which are arranged in parallel with an interval larger than the dock width, are connected by a front connecting cross beam and a rear connecting cross beam, respectively. The first step is to assemble a large marine structure by constructing the main hulls on both sides of the dock and connecting the front and rear parts with the front and rear connecting cross beams that cross the dock, respectively, and the first step of assembling a large offshore structure. The ship was pulled into the dock using ballasting or ballasting and brought under the connecting cross beams, and after lifting both connecting cross beams with the ship's hull using high tide or ballasting, the ship was pulled into the dock. The second step is to discharge the large offshore structure together with the dock, and the third step is to launch the large offshore structure onto the sea by slightly sinking the ship by ballasting at sea. A method for constructing large offshore structures.