JPS6212492A - Method for building semi-sub rig - Google Patents

Abstract

PURPOSE:To efficiently build a semi-sub rig wider than a dock, by building a pontoon within a width of the dock, building an upper structure on the pontoon, hanging the upper structure after launching, and moving the pontoon to a normal position. CONSTITUTION:Pontoons 2 are built in a dock, and columns 3 and an upper structure 4 are built on the pontoons 2 with a normal dimension. After building, the assembly is launched, and the upper structure 4 is hung at its one side by a marine crane 6. Then, the pontoon 2 on the hung side is filled with a ballast water to adjust a buoyancy. Then, the pontoon 2 is separated from the column 3, and is moved to a normal position. Then, the pontoon 2 is again connected to the column 3. Similarly, the opposite pontoon 2 is returned to a normal position. Thus, it is possible to efficiently build the columns and the upper structure in a usual dock without dividing the wide semi-sub rig, and further carry out a marine operation more easily than the case of dividing the semi-sub rig.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for efficiently constructing semi-subribs that are wider than the width of a construction dog.

(Prior art and its problems): r-sumifu544-go11〃戴+动组+strdrawing The width of the misa brig may be wider than the width of the construction dog.

For this reason, in the past, for example, as shown in Figure 3, the front and rear of the semi-subrig 20 were divided at the dividing line 21, and the two parts were each turned 90 degrees in the dog. A method was known in which parts were joined above sea level.

However, in such a method, the upper structure 22 is divided into two parts, which requires time and effort to connect the column 2.
If the number 3 is 4 trees on one side, it is easy to divide it into two parts, front and back.
A semi-sub rig with 2 or 3 rigs on each side will result in poor stability.
There are problems such as difficulty in dividing the front and rear parts into two parts.

The present invention was proposed as a result of studies to solve these problems.

(Means for Solving the Problems) As shown in FIGS. 1 and 2 corresponding to the embodiment, the present invention first constructs bontoons 2, 2 within the width of the construction dog l, and then places columns on top of the bontoons 2, 2. 3゜3 and superstructure 4 are constructed.

Next, after launching such a temporary structure, the sea and crane 6
After lifting the superstructure 4 and adjusting the ballast by pouring water into the pontoons 2 and 2, the pontoons 2.
2 and column 3.3. Next, Pontoon 2.
2 to its normal position and connect it to column 3.3 in its normal state.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2. First, in FIG. 1, 5 is a semi-subrig,
The semi-subrig in this embodiment is composed of pontoons 2, 2 which serve as buoyant parts, a column 3.3 and an upper structure 4 built thereon.

In the present invention, when constructing the wide semi-subrig 5,
First, the pontoons 2, 2 are built within the width of the dog 1, and the columns 3, 3 and the superstructure 4 are built thereon to regular dimensions. In this case, the positions of pontoon 2.2 and column 3.3 are misaligned as shown in Figure 1, but semi-subrigs can be built efficiently and in a short period of time using construction dogs equipped with large cranes. .

In this state, after construction, the ship is launched into a sea, and one side of the upper structure is lifted up by a marine crane 6, as shown in FIG. In the same way, ballast water is injected into one of the pontoons 2 on the lifted side to adjust the buoyancy, then the pontoon 2 and column 3 are separated, the pontoon 2 is pulled to its normal position, and the pontoon 2 is reattached. Connecting.

Using the above procedure, the pontoon 2 on the opposite side is also returned to its normal position.

In the embodiment described above, the pontoons 2.2 on both sides are moved, but if the width of the four semi-subrigs 5 is even narrower, only the pontoons 2 on one side may be moved.

(Effects) According to the present invention described above, when building a wide semi-subrig, columns and superstructures can be efficiently built in a short period of time using a normal construction dog without dividing the semi-subrig. It also has the advantage of being easier to carry out work at sea compared to the method of joining divided structures.

[Brief explanation of drawings]

1 and 2 are schematic diagrams for explaining the present invention in detail, and FIG. 3 is a schematic diagram for explaining the conventional method. In the diagram, 1 is the construction dog, 2 is the pontoon, 3 is the column, and 4
5 is a superstructure, 5 is a semi-subrig, and 6 is a marine crane.

Claims (1)

[Claims] This is a method of building a semi-subrig that is wider than the dog width, in which a pontoon is built within the dog width, the upper part of the column is built to the regular dimensions, then launched, and the upper structure is built above sea level. This method of constructing a semi-subrig is characterized in that after lifting an object and adjusting the ballast of the pontoon, the pontoon and the column are separated, the pontoon is then moved to a regular position, and then the pontoon and the column are connected again.