JPH0523992B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for constructing a large twin-hulled crane ship and other offshore structures, and particularly relates to a method for constructing a large twin-hulled crane ship and other offshore structures. It's about how things are built in docks and at sea. Incidentally, a twin-hulled structure is a structure in which two floating bodies are connected by a deck section or a platform section.

[Prior Art] When attempting to construct a twin-hulled structure with a size exceeding the width of a dock, the following methods have conventionally been used. In other words, the structure is constructed by dividing a large structure into several blocks and assembling the blocks using a floating crane at sea, or by using two adjacent docks and straddling both docks. There are two methods of construction: the twin hull is lowered, the deck or platform is floated above it, and then the twin hull is floated again to be assembled and constructed.

However, the above method uses a floating crane, and it is difficult to position each block when assembling it with this floating crane. Also, since each block is welded, the number of welding points increases, which makes the work more dangerous. This has the drawback of increasing the overall cost.

This method requires that the two docks be adjacent to each other, which poses a problem in terms of equipment.

This method requires the twin fuselage to sink or float, so it cannot be carried out in shallow areas.

[Object of the Invention] The present invention improves the construction of a conventional floating crane by constructing a twin-hulled structure that exceeds the width of the dock, mostly within the dock, and finally constructing it at sea using a separate floating structure. The purpose is to eliminate the need for welding, minimize work such as welding at sea, and simplify construction.

[Structure of the Invention] The method for constructing a twin-hulled structure of the present invention involves positioning the buoyant twin-hulled portions of the structure in a dock with a narrowing distance between them in accordance with the width of the dock, and When placing a deck or platform on two bodies, one body and the deck or platform should be assembled in their normal position, and the other body should be assembled inside the normal position with respect to the deck or platform. The ship is constructed in a dock by temporarily attaching it in a shifted position, and then floated in the dock as it is and docked. After supporting the deck part or platform part at sea using a barge etc., the above-mentioned The other body, which has been temporarily attached by shifting it inward from the normal position, is moved to the normal position and permanently attached to construct the twin-body structure.

Embodiments of the present invention will be described below with reference to the drawings.

[Example] Example 1 Figures 1 to 3 show an example of the present invention. When constructing a twin-hulled structure larger than the width of the dock, first, the first As shown in the figure, one of the twin body parts 1a and 1b having buoyancy is shifted inward from the normal mounting position to create a facing interval that matches the width of the dock 2, and a frame is installed inside the dock 2. 3, the body parts 1a and 1b with the above-mentioned facing interval narrowed are placed. Next, the body parts 1a and 1b are connected to a beam 4 with a temporary frame 5 incorporated therein.
In addition, a deck section or platform section 6 having a width wider than the dock width is placed over the body sections 1a and 1b, and the deck section or platform section 6 and the body section 1a are It is fixed at the normal position, and the deck section or platform section 6 and the body section 1b are temporarily attached at a position shifted inward from the normal position.

Next, fill water in the dock 2 and
Another barge 7 is inserted between the twin hulls at sea, and the deck section or platform section 6 is supported by the barge 7. Then, as shown in Fig. 2, the barge 7 is placed on a working scaffold. As a result, the temporary frame 5 is removed and the connection between the body parts 1a and 1b is cut off.

Next, either remove the temporary attachment between the trunk 1b and the deck or platform 6 and lower the trunk 1b slightly by adjusting the buoyancy, or lift the deck 6 with the barge 7. Torso 1b
A gap δ is created between the body part 1b so that the body part 1b can move freely, and after moving this body part 1b to the normal mounting position using a winch or the like (not shown), the body part 1b is
The upper end of the deck portion 6 is brought into contact with the deck portion 6 again to perform the final attachment. Thereafter, the regular beams 8 are inserted and attached to the temporary beams removed from between the beams 4 of the body parts 1a and 1b on both sides, and the construction is completed. 9 is a roller attached to the upper end of the purge 7. Note that rollers are not required if only the deck part is to be lifted.

Embodiment 2 FIG. 4 shows another embodiment of the present invention, in which a barge with rollers 9 is attached to the outside of the body 1b on the moving side at sea after the work in the dock is completed and the barge is docked. 1
0, and the deck part 6 with the roller part of the barge 10.
is supported, and with the deck part 6 floating on the barge 10, the body part 1b is moved together with the purge 10 to the regular installation position, and then the body part 1b and the deck part 6 are permanently attached and constructed. do it like this. At this time, the barge 10 may be fixed to the body 1b, or
You can leave them apart.

Embodiment 3 FIG. 5 shows another embodiment of the present invention, in which the method of moving the trunk 1b on the sea is further changed as in the case of FIG. 1
A support device including a frame 11 equipped with jacks 12 and rollers 13 is placed on top b, and the deck section 6 is slightly lifted from the upper end of the body section 1b using the jacks 12. In this state, while rolling the rollers 13, the body is Move the part 1b to the proper mounting position, then tighten the jack 12.
After shortening the deck part 6 and placing it on the upper end of the body part 1b, the main body part 1b is attached and constructed. The shape of the pedestal 11 in this embodiment may be other than that shown.

Embodiment 4 FIG. 6 shows still another embodiment of the present invention, in which a hollow barge 14 is used as a barge to support the deck section 6 at sea, and a moving side trunk is installed in the hollow part of the barge 14. The part 1b is positioned so that the deck part 6 is supported via the rollers 9 at the upper end of the barge 14, the deck part 6 is lifted by the barge 14, and the body part 1b is moved together with the barge 14 to the normal position,
It is constructed by attaching the trunk section 1b to the deck section 6. Note that the hollow barge 14 may be divided into two parts and used as two barges, and instead of the rollers 9, a slippery material may be used to make it slide.

Embodiment 5 FIG. 7 shows yet another embodiment of the present invention, in which a barge 7 is first installed at sea as shown in FIG. 7A.
is placed on the outside of the movable body part 1b, the deck part 6 is lifted and the body part 1b is moved to the normal position, and when the rollers 9 on the barge 7 come to a position where they are removed from the deck part 6, the barge 7 is moved. The body part 1b is moved to the inside of the body part 1b, the deck part 6 is lifted again, the body part 1b is moved to the normal position, and the body part 1b and the deck part 6 are permanently attached to construct the body.

[Effects of the Invention] As described above, according to the construction method of the present invention, the following excellent effects can be achieved.

(i) It becomes possible to easily construct a large twin-hulled structure that exceeds the existing dock equipment.

(ii) Work such as welding at sea can be minimized, improving safety and quality.

(iii) Floating cranes, etc. are no longer required, reducing equipment costs.

(iv) It can be carried out without much influence from water depth.

[Brief explanation of the drawing]

1 to 3 are front views showing the construction process showing an embodiment of the construction method of the present invention, and FIGS. 4 to 7
Figures A and B are front views showing other embodiments of the construction method of the present invention. 1a and 1b are the trunk, 2 is the dock, 6 is the deck or platform, 7 is the barge, 8 is the beam,
10 is a barge, 11 is a pedestal, and 14 is a hollow barge.

Claims (1)

[Claims] 1. In the construction method of a twin-hulled structure consisting of two floating bodies connected by a deck or platform, one of the two bodies as a floating body is properly attached to the deck or platform. Shift it inward from the position and install it in the dock according to the width of the dock, then fix the deck section or platform section and one body section in the correct position with the dock, and connect the other body section and the deck section or platform section. After temporarily attaching the parts, move it to the sea and support the deck part or platform part with a support device attached to the barge floating on the sea or the other body part, and then move the temporarily attached part to the normal position. A method for constructing a twin-hulled structure, characterized in that the structure is constructed by attaching the structure to the deck or platform.