JPS5921404B2 - 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.

However, in the case of extremely large structures such as offshore oil field work platforms,
The height and width of the substructure are too large to fit into a normal dock, and the lifting height of the crane is insufficient, making it impossible to use normal construction methods.

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

1 to 3 show an example of a structure to which the method of the present invention is applied.

The ultra-large structure 1 is configured as a workbench for an offshore oil field, and also includes a lower structure 2 and an upper structure 3.

The lower structure 2 includes four main body pillars 4a to 4d forming a mud mat, and an intermediate member 5 disposed between these main body pillars 4a to 4b.

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

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

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. 4A and 4B, two main body columns 4a,
4b are assembled in a horizontal position on the upper surface 13 of both sides of the dock 12.

Further, a part of the intermediate member 5 is assembled between the side wooden body columns 4a and 4b on the stand 15 of the purge 14 floating in the dock 12.

Note that the intermediate member 5 may be assembled to some extent elsewhere and then transported onto the barge 14.

The barge 14 then remains in place until the lower structure 2 is completed.

Thereafter, the remaining two main body pillars 4c and 4d are assembled slightly above the main body pillars 4a and 4b (Fig. 4C).

At this time, the upper main body columns 4c and 4d are the lower main body columns 4.
It is located below the relative position of the lower structure 2 in its completed state with respect to a and 4b, so that the upper main body columns 4c and 4d can be assembled using a small crane device without the problem of insufficient lifting height.

When the assembly is completed, the upper main body pillar 4c is moved by a jacking device (not shown) using the guide device 26 (FIG. 4E) placed between the upper and lower main body pillars 4a to 4d or the completed part of the intermediate member 5. , 4d to a predetermined position.

It is desirable that the beams 16 serving as guides provided between the upper and lower main body columns 4a, 4c and between 4b, 4d have an expandable structure with a large diameter tube 16a and a small diameter tube 16b fitted therein.

At this time, it is desirable to use a temporary support 17 to stabilize the structure as shown in the fourth diagram.

Note that the upper main body columns 4c and 4d may be assembled at another location away from the dock 12, and then raised to a predetermined position after being assembled above the lower main body columns 4a and 4b.

When the raising is completed, the remaining intermediate member 5 is placed and welded as shown in FIG. 4F.

A large crane is used to arrange the intermediate members 5, but unlike when assembling the main body columns 4a to 4d, the number of members is small (
Since it is a heavy member, a large crane can be used effectively.

In this way, when the lower structure 2 is completed, the barge 1
4 will be removed.

The superstructure 3 is completed using the normal construction method elsewhere, and the barge 14 is installed from another dock 18 as shown in FIG. 4G.
I'll put it on.

This barge 14 is moved to the dock 12 of the lower structure 2, and is directly aligned and joined to the lower structure 2.

Vertical positioning at this time is performed by adjusting the ballast of the barge 14.

Intermediate members necessary for joining will be loaded by crane.

In this way, structure 1 is completed. As explained above, according to the method of the present invention, a super large structure can be successfully constructed using an existing dock and crane.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view of a super large structure, Fig. 2 is a plan view of a lower structure, Fig. 3 is a bottom view of a main body column, and Fig. 4 A-H. is an explanatory diagram of the construction process. 1... Ultra-large structure, 2... Lower structure, 3... Upper structure, 4a to 4d...
・Body column, 5... Intermediate member, 6... Support column, 7... Beam, 8... Unit column, 9...
...Connecting material, 12...Dock, 14...
...Barge, 16...Beam, 17...
Temporary support, 18...Dock, 26...Guide device.

Claims (1)

[Claims] 1. A construction method for a super-large structure consisting of an upper structure and a lower structure, where the lower structure is composed of a plurality of main body columns and intermediate members placed between these main body columns. Assemble some of the main body columns on the upper surface of both sides in a horizontal position, assemble some of the intermediate members between the two main body columns via the purge floating in the dock, and then install a part of the intermediate members slightly above some of the main body columns. Assemble the remaining main body pillars in place, and with the guide device installed between the upper and lower main body pillars, raise the upper main body pillar to the specified position using the jacking device, and then assemble the remaining intermediate members between each main body pillar. Assemble the
Therefore, the lower structure is built in a horizontal position, and after the construction of this lower structure is completed, the upper structure built elsewhere is moved in a horizontal position into the dock via a purge, and the ballast adjustment for the purge is carried out. A method of constructing a super-large structure, which comprises aligning the upper structure with respect to the lower structure using a method, and then joining the side structures.