JPS5826445B2 - How to build super large structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing very large structures such as offshore oil field platforms.

Docks have traditionally been used to construct offshore work platforms.

Furthermore, in the case of large structures, attempts have been made to construct a lower structure and an upper structure separately, and then to join them together later.

For this joining, the lower structure is placed on the upper surface of the side of the dock, and the upper structure is transported into the dock by purging.

However, in the case of very large structures, there is a problem in that the lifting height of the crane is insufficient to construct the lower structure on the top side of the dock.

The present invention proposes a construction method that solves these problems, and one embodiment thereof will be described below with reference to the drawings.

1 and 2 show an example of a structure to which the method of the present invention is applied.

The structure 1 is constructed as a workbench for an offshore oil field, and consists of a lower structure 2 and an upper structure 3.

The lower structure 2 is composed of four main body pillars 4a to 4d forming a mud mat, and an intermediate member 5 arranged between these main body pillars 4a to 4d.

The intermediate member 5 consists of a plurality of columns 6 and horizontal and inclined beams 7 connected between each of the main body columns 4a to 4d and the columns 6.

The main body columns 4a to 4d are composed of a large number of unit columns 8, a connecting member 9, and an outer shell member.

The upper structure 3 includes a plurality of columns 10 connected to the main body columns 4a to 4d and columns 6 of the lower structure 2, and beams 11 in horizontal and inclined directions.

Next, the construction method will be explained.

First, as shown in FIGS. 3A and 3B, the side frame 2a on one side of the lower structure 2 is assembled in the dock 10 in a horizontal position.

The opposite main body pillars 4a and 4b are arranged apart from each other in the longitudinal direction of the dock 10.

Since the lower structure 2 cannot float by its own buoyancy,
A purge 11 is arranged at the lower part of the side frame 2a.

After this, the upper main body column 4c. 4d to construct the entire lower structure 2.

(Figure 3 0.D).

At this time, since the lower structure 2 is located within the dock 10, the lifting height of the crane is sufficient compared to the case where the lower structure 2 is constructed on the side upper surface 10a of the dock 10.

If the lifting height of the crane is insufficient, both upper vehicle body columns 4
c and 4d are assembled below the position of the lower structure 2 in the completed state, and raised to a predetermined position after the assembly is completed.

This elevation is between the upper and lower main body columns 4a, 4c, 4b, 4
This can be done by making the beam 7a between a telescopic and retractable, or by using an appropriate guide device.

Reference numeral 12 denotes a temporary support provided to ensure stability when raising the tower.

When the lower structure 2 is completed, it is guided to the sea outside the dock 10 by a barge 11, and a submersible purge 1 is installed on the underside of the barge 11.
Repeat 3 (Figure 3E).

By stacking the barges 11 and 13 in two tiers in this way, sufficient buoyancy can be obtained and the entire lower structure 2 can be lifted high above the water surface.

In this way, the lower structure 2 is lifted high, and the barge 11.13 is extended by changing the horizontal direction, and the lower structure 2 is placed on the upper surface 10a of both sides of the dock 10.

The superstructure 3 was completed using normal construction methods elsewhere,
Load it onto the barge 15 from another dock 14 as shown in FIG. 3G.

This barge 15 is moved to the dock 10 of the lower structure 2, and is directly aligned and joined to the lower structure 2 (Fig. 3H)
.

Vertical positioning at this time is performed by adjusting the ballast of the barge 15.

The parts necessary for joining will be loaded onto the tower using a crane.

In this way, the super large structure 1 is completed.

In addition, when constructing the lower structure 2 in the dock 10, if the lifting height of the crane is slightly insufficient, the lower parts 40a and 40b of the lower main body columns 4a and 4b are left in an unbuilt state as shown in Fig. 4A. The entire other part of the lower structure 2 is constructed.

Then, after the lower structure 2 is carried out to sea as described above and placed on the side upper surface 10a of the dock 10, the main body column 4a is
.

Complete the unbuilt portion of 4b, 40a, and 40b.

This eliminates the need to raise the main body columns 4c and 4d as described above.

In addition, by using it in conjunction with lifting, it is possible to further compensate for the lack of lifting height of the crane.

The present invention can be carried out as described above, and according to this, the substructure is built inside the dock, changed its horizontal direction on the water outside the dock, and is placed on the upper side of the dock. A super-large lower structure can be constructed without the problem of insufficient lifting height of the crane, and it can be easily joined to the upper structure.

Further, when rearranging the lower structure, a diving barge is used to stack the barges in two stages, so the lower structure can be easily lifted and placed on the upper surface of the side of the dock.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Fig. 1 is a front view of a super large structure, Fig. 2 is a bottom view of the main body column, Fig. 3 A-H is an explanatory drawing of the construction process, and Fig. 4 A and B. is an explanatory diagram of a partial modification of the construction process. 1... Ultra-large building, 2... Lower structure, 3... Upper structure, 4a to 4d...
- Main body column, 5... Intermediate member, 6... Support column, 7, 7a... Beam, 8... Unit column,
9... Connection material, 10... Dock, 10
a... Side upper surface, 11... Barge, 1
3...Dive purge, 14...Dock,
15...Barge, 40a. 40b...Unbuilt part.

Claims (1)

[Claims] 1 A method of constructing a super-large structure consisting of an upper structure and a lower structure, in which the lower structure is built in a horizontal position by being placed on a submersible purge in a dock, and this lower structure is placed on a dock using the submersible purge. The submersible purge is carried out onto the water or underwater, another submersible purge is placed on top of the underside of the submersible purge, the lower structure is lifted up by these submersible purges and placed across the upper surface of both sides of the dock, and the upper structure is attached to the lower structure. A method of constructing a super large structure characterized by joining.