JPH0364647B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a marine structure.

Conventionally, one of the methods for constructing a bottom-mounted marine structure is to first construct a ring-shaped protective structure around it, drain the seawater inside it, construct the main body inside it, and then build the protective structure after constructing the main body. There is a dry dock method for removing objects.

However, the above construction method has a limit on the size of the structure itself.

In other words, in order to construct the main body of the structure, it is necessary to construct a dock large enough to surround the main body, which poses problems in terms of construction cost, construction period, etc.

The present invention has been made in view of the above points, and the outer peripheral part that will eventually become a part of the structure and the internal structure built using the outer peripheral part as a dock are integrally constructed to form the main body of the structure. Therefore, it is an object of the present invention to provide a method for constructing a marine structure that can construct a structure larger than conventional ones.

In other words, the outer periphery, which will eventually become part of the structure, is divided into multiple blocks and constructed using existing docks, each block is towed out to sea and joined together to form the outer periphery, and the outer periphery is submerged in seawater. The present invention relates to a method of constructing a marine structure in which seawater inside the structure is drained by using a partition, an internal structure is built within the outer circumferential portion, and the outer circumferential portion and the internal structure are integrally formed.

Next, a method for constructing a marine structure according to the present invention will be explained based on the drawings.

(a) Manufacture of blocks (Figs. 1 and 2) A block 2 corresponding to the outer periphery 1 which will eventually become part of the structure body is divided and manufactured using a dock D such as an existing dry dock.

The block 2 has a shape obtained by dividing the outer circumferential portion 1, which is an annular structure in plan view, into four equal parts, and is constituted by a well-known hollow box-shaped caisson.

(b) Towing and sinking blocks (Figures 2 and 3) After injecting ballast water B to each block 2 for water adjustment, the blocks 2 are towed to a designated location on the ocean and the outer circumference 1
Arrange them to form a

Each block 2 is then sunk onto a sandhead C previously provided on the seabed.

(c) Temporary joining of blocks (FIGS. 3 and 4) A temporary water stop wall 4 made of steel sheet piles or the like is installed around the outer periphery of the outer peripheral portion 1 formed by the blocks 2.

The temporary water stop wall 4 is driven into the sea and the seabed ground, and sand S is filled between the temporary water stop wall 4 in the sea and the outer wall of the outer peripheral part 1.

The joint portion 21 of each block 2 is formed by injecting mortar into a mold such as an air-type rubber mold to temporarily join the blocks 2 together.

(D) Dry-up (Fig. 5) After the temporary bonding of each block 2 is completed, the outer peripheral part 1
Pump and drain seawater from the area surrounded by.

In other words, the outer periphery 1 that will eventually become part of the structure
It can also be used as a seawater protection structure and has the same function as a dry dock.

At this time, water pressure from the outside of the outer circumferential portion 1 brings the respective joints 21 into closer contact and makes them more solid.

(e) Construction of internal structure (Fig. 6) The constructed outer peripheral part 1 is also used as a dog to construct the internal structure 3 inside.

Next, the internal structure 3 and the outer peripheral part 1 are integrally formed to form a structure main body A.

Ballast water B is injected into the caisson constituting the internal structure 3 to stabilize the structure body A against buoyancy and wave force, and the temporary water stop wall 4 on the outer periphery of the outer peripheral part 1 is removed.

(f) Other embodiments 1 Structure main body A consisting of outer peripheral part 1 and internal structure 3
In addition to landing on the bottom on the spot, it is also possible to drain the ballast water B of each caisson constituting the internal structure 3 and the outer peripheral part 1, float it, and then tow it to a predetermined sea area and land it on the bottom.

(G) Other Embodiment 2 In addition to the above-mentioned embodiments, it is also conceivable that the temporary water stop wall 4 installed on the outer periphery of the outer circumferential portion 1 is installed only on the seabed ground.

In this case, the boundary between the upper end of the temporary water stop wall 4 and the outer wall surface of the outer circumferential portion 1 is waterproofed with underwater asphalt or the like.

Furthermore, if the seabed is rocky, it may be difficult to install the temporary water stop wall 4, so the boundary between the seabed and the outer circumference 1 is waterproofed with underwater asphalt or the like.

(H) Other Embodiments 3 The marine structure constructed by the construction method of the present invention is not limited to concrete, and may be made of steel or a combination of both.

Further, the planar shape of the outer circumferential portion 1 does not necessarily have to be circular, and may be polygonal.

Since the present invention is as described above, the following effects can be expected.

(b) The outer periphery, which will eventually become part of the structure, also serves as a protective structure.

Therefore, there is no need to separately construct a large dry dock, and the construction cost of the marine structure can be lowered, and the construction period can be shortened.

(b) The outer periphery, which will eventually become part of the structure, will be constructed in multiple parts.

Therefore, existing shipbuilding docks can be used.

[Brief explanation of drawings]

Figure 1: Explanatory diagram of the block production situation, Figure 2
Figure: Layout diagram of blocks that make up the outer periphery, Part 3~
Figure 4: An explanatory diagram of the connection status of each block, Figure 5:
Explanatory diagram when dry-up inside the outer periphery, No. 6
Figure: An explanatory diagram when the main body of the structure is constructed. 1: outer periphery, 2: block, 3: internal structure,
4: Temporary water stop wall, A: Structure body, B: Ballast water, D: Dock.

Claims (1)

[Scope of Claims] 1. The outer peripheral part, which will eventually become part of the structure, is divided into a plurality of blocks and constructed using existing docks, and each block is towed out to sea and joined together to form the outer peripheral part, A method of constructing a marine structure in which the outer periphery is used as a seawater partition to drain the internal seawater, an internal structure is built within the outer periphery, and the outer periphery and the internal structure are integrally formed.