JPS593318B2 - How to transport a large constructed structure from a dock to a floating body for waiting transportation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is a method for constructing large structures, such as blocks constituting a plant, and transporting and installing them to a desired location, from a dock, which is a construction site, to a floating body for waiting and transporting large structures. Concerning how to move things out.

The plant construction method involves dividing the plant into multiple blocks, assembling each block on a surface plate, then transporting it to the construction site and installing it as is on the pre-levelled site.
Methods are being considered to omit foundation work and assembly on site.

In order to realize this method, the assembled plant
The method of unloading, transporting and loading the blocks must be worked out in advance.

The weight of such a plant block is 500 (t)
It is estimated to be about 1600 (t).

Assuming that the plant blocks are assembled in the dock, the maximum lifting capacity of a large crane installed on the dock is approximately 700 (t), so the weight of the plant block often exceeds the lifting capacity of the crane.

This invention was made in view of the above circumstances, and
The purpose of the present invention is to provide a method for safely and reliably transporting a large structure whose weight exceeds the lifting capacity of a crane without installing a new crane with a larger lifting capacity.

In order to achieve the above-mentioned purpose, the method of carrying out a large constructed structure from a dock to a floating body for transportation according to the present invention is based on the method of carrying out on-site installation on a board placed on the bottom of a dock. After placing a board and assembling a large structure on this surface plate, attach an auxiliary tank to the bottom of the surface plate, fill the dock with water, and use a crane to lift the surface plate with the large structure on it. In addition, the lifting force of the crane is assisted by the buoyancy of the auxiliary tank, and the large structure is moved along with the surface plate to a location where a floating body for transportation is waiting.

Here, the transportation floating body refers to the towing tank and purge.

A more detailed explanation will be given below with reference to the drawings.

First, a board 2 is placed at a predetermined position on the bottom surface 1 of the dock, and a surface plate 3, which will serve as a foundation for on-site installation, is placed on the board 2 by a crane (not shown).

The surface plate 3 includes not only plate-shaped items but also all items that serve as the basis for installation on site, such as only a frame.

Then, a large structure P is assembled on this surface plate 3, and the necessary pipes and equipment are installed (see Figure 1).
.

After the structure P is completed, the auxiliary tank 4 is carried under the surface plate 3 (see Fig. 2).

The auxiliary tank 4 is preferably carried in by sliding on rollers 5 disposed on the bottom surface 1.

However, this auxiliary tank 4 is made to have a size that has enough buoyancy to compensate for the insufficient lifting capacity of the crane relative to the weight of the structure P.

Next, attach the auxiliary tank 4 to the bottom surface of the surface plate 3 (see Figure 3).

After this, seawater is injected into the dock, and the surface plate 3 on which the structure P is placed is lifted up using the cable 6 (see FIG. 4).

Since the buoyancy of the tank 4 acts on the structure P, even if the gravity of the structure P exceeds the lifting capacity of the crane, the structure P
It is possible to lift.

The structure P is moved while being lifted to a location where the pedestal 7 and the towing tank 8 are prepared, and the structure P is temporarily placed on the pedestal 7 (see FIG. 5).

Then, the seawater in the dock is discharged, the auxiliary tank 4 is removed, and the towing tank 8 is attached to the lower surface of the surface plate 3.

Finally, when water is poured into the dock again, the towing tank 8 has sufficient buoyancy to float the structure P.
The structure P is floated by this tank 8 (see FIG. 6).

In this state, the tank 8 is towed to the planned construction site, and the structure P is transported together with the surface plate 3.

It is also possible to mount the structure P on the barge 9 instead of the towing tank 8.

While the structure P on the surface plate 3 is lifted by a crane with the help of the buoyancy of the tank 4 (Fig. 4), it is moved above the barge 9 which has been sunk in advance, and a support platform is placed on the deck of the barge 9. The structure P is mounted through the structure P (see FIG. 7).

If barge 9 is a submerged pull barge, it can sink by itself; if it is a regular barge, barge 9 can be lowered by towing it into the dock and then injecting water into the barge's tank from the dog side. be able to.

After setting the structure P on the submerged barge 9,
If the barge 9 is floated, the structure P will also float, and in this state, the structure P can be transported to the destination.

If the barge 9 is a normal barge, after setting the structure P on the barge 9, drain the seawater in the dock, drain the ballast in the barge 9 at the same time, and inject it into the dock again. As a result, Barge 9 floats up on its own.

When the structure P is transported by the barge 9, the barge has a high freeboard, so there is an advantage that the structure P is not directly covered with seawater and is safe.

As described above, according to the method of the present invention, when a large structure is built in a dock, even if the weight of the structure exceeds the lifting capacity of the crane, it is necessary to construct a new crane with a larger lifting capacity. This makes it possible to easily and reliably assemble a large structure, load it onto a towing tank or barge, and transport it from the dock to a waiting floating body.

Furthermore, since the auxiliary tank is just enough to make up for the lack of lifting capacity of the crane, it does not need to be very large.

Since the auxiliary tank is used only when transporting the structure, only one set is sufficient, and a large number are not required.

In addition, since the structure is assembled by placing a surface plate on a board, you only need to prepare a normal board, and its height can be the same as that normally used, so there is no need to manufacture a new board. This is extremely convenient because an auxiliary tank can be attached to the bottom of the surface plate.

In addition, the surface plate used when assembling the large structure is moved together with the large structure to the location where the transportation floating body is waiting, and the on-site installation of the large structure is the basis of time. , the surface plate can be used extremely effectively.

After the large structure is assembled, the surface plate on which it is placed is lifted by a crane, so there is no need for a strong connection between the large structure and the surface plate.

When a large structure is lifted by a crane, the large structure itself needs to be strong enough to withstand the lifting, and it is also necessary to securely connect the large structure to the surface plate below. According to , such consideration is not required.

[Brief explanation of the drawing]

1 to 6 are side views showing the procedure for implementing the present invention, and FIGS. 7 and 8 are side views showing the procedure for mounting a large structure on a barge, respectively. 1...Bottom of dock, 2...Board, 3
......Surface plate, 4...Auxiliary tank, 8...
...Transportation floating body (towing tank), 9...
Barge, P...Large structure.

Claims (1)

[Claims] 1 Place the surface plate 3, which will serve as the foundation for on-site installation, on the board 2 placed on the bottom surface 1 of the dock, and after assembling the large structure P on this surface plate 3, An auxiliary tank 4 is attached to the bottom of the dock, water is filled in the dock, and a crane is used to lift the surface plate 3 on which the large structure P is placed, and the buoyancy of the auxiliary tank 4 assists the lifting force of the crane, allowing the large structure to be lifted. A method for carrying out a large-scale constructed structure from a dock to a floating body for transportation, characterized by moving P along with the surface plate 3 to a place where a floating body for transportation 8 is waiting.