JP7283827B1 - Construction method of support structure - Google Patents

Abstract

An object of the present invention is to provide a strut structure and a method for constructing the strut structure, which can quickly perform the work of laying a bag body before driving the struts. A post structure (S) includes a bag body (1) filled with a filling material (51) laid on the seabed (or water bottom), penetrates the bag body (1), and penetrates the ground of the seabed (or water bottom) (10). It is provided with a strut 3 shot into. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a method for constructing a support structure, and more particularly to a method for constructing a support structure, which can quickly perform the work of laying a bag body before driving the support.

Conventionally, as a typical basic structure of offshore wind power generation facilities, there is, for example, the monopile type, which has a proven track record in Europe. This monopile type foundation structure has a two-layer anti-scouring structure using stone around the foundation. The lower layer of the anti-scouring work is made of small-grained stones (e.g., 0-80mm), which has the function of preventing scouring of seabed sand, and the upper layer is made of large-grained stones (e.g., 200mm-1000mm). It has the function of preventing the stones in the lower layer from being washed away by ocean currents, waves, and tidal currents. However, when laying the stone materials in the lower layer, there is a problem that the laid stone materials tend to flow out and there is a lot of loss. As a method for improving this, there is a method described in Patent Document 1 below, for example.
In order to improve the construction efficiency of structure installation work (for example, offshore wind power generation facility foundation work), scour prevention sheets are laid on the bottom of the water or the sea, and piles (for example, steel pipe piles) are erected. Scouring prevention works are installed before construction.

Patent No. 7018159

However, the anti-scouring sheet described above has a problem that the anti-scouring sheet is lifted by the influence of ocean currents or water currents, thereby promoting scouring.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for constructing a support structure, which is made in consideration of the above circumstances.

The method for constructing a support structure according to claim 1 comprises a laying step of laying a bag filled with a filling material on the seabed or the seabed; and a driving step of driving the post into the ground.

Further, the method for constructing a support structure according to claim 2 is the construction method for a support structure according to claim 1 , wherein the bag is formed of a net having a plurality of meshes, and the inside of the bag is formed by a plurality of nets. It is formed into a plurality of small chambers partitioned by partition members, and each of the small chambers is filled with a filling material.

In conventional anti-scouring sheets, there is a problem that the anti-scouring sheet is lifted by the influence of ocean currents or water currents, and scouring is accelerated. Compared to conventional anti-scouring sheets, the bag is less susceptible to ocean currents or water currents and cannot be lifted because it is filled with a filling material, so scouring can be prevented.

FIG. 1 is a schematic cross-sectional view of a pillar structure according to one embodiment of the present invention. 2 is a schematic cross-sectional view transverse to the longitudinal direction of the strut structure of FIG. 1; FIG. FIG. 3 is a schematic cross-sectional view of another embodiment different from the embodiment of FIG. FIG. 4 is a schematic cross-sectional view of another embodiment different from the embodiment of FIG. FIG. 5 is a schematic cross-sectional view of another embodiment different from the embodiment of FIG. FIG. 6 is a schematic cross-sectional view of another embodiment different from the embodiment of FIG.

A construction method for a support structure according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.
S shown in FIG. 1 is a strut structure, and the strut structure S is a first bag filled with a first filling material laid (installed so as to be laid) on the seabed (or water bottom) 10. (Bag body) 1 and a second bag body (bag body) placed on the first bag body (bag body) 1 and filled with a second filling material larger than the first filling material ( bag) 2, this second bag (bag) 2 and the first bag (bag)
1 and a post 3 driven into the ground of the seabed (or water bottom) 1.
The support 3 supports, for example, the blades (wings) of a windmill used in offshore wind power generation equipment, and is also used as a support for bridges, piers, and the like. 20 shown in FIG. 1 is the sea surface.

In the conventional anti-scouring sheet, the anti-scouring sheet is lifted by the influence of ocean currents or water currents, causing a problem of promoting scouring. Compared to the digging prevention sheet, the first and second bags (bags) 1 and 2 are less susceptible to ocean currents or water currents and cannot be lifted because they are filled with the first and second filling materials. Therefore, scouring can be prevented.
In addition, desirably, as shown in FIG. 4, a partition member 4 partitions the periphery of the portion X of the post 3 penetrating the second bag (bag) 2 and the first bag (bag) 1. , The portion of the post 3 that penetrates the second bag (bag) 2 and the first bag (bag) 1 is not filled with the filling material, so that the work of driving the post 3 is facilitated. can do.

The first bag (bag) 1 shown in FIG. 2 is formed of a net having a plurality of meshes, and the inside of the first bag (bag) 1 is divided by a plurality of partition members. Each small room is filled with a filling material. 10m, about 6m wide, and about 0.25m high.
The weight of the filling material filled in the first bag (bag) 1 is, for example, 4.0t to 30t, and the particle size is 80mm or less. Even if a stone material with a small particle size (for example, 0 to 80 mm) is used as the filling material to be filled in the first bag body (bag body) 1, the first bag body (bag body) 1 is prevented from flowing out of the stone material. In order to prevent this, it is difficult for stones to flow out during installation, and loss can be reduced. Even if a stone with a small particle size (for example, 0 to 80 mm) is used as the filling material, it will function as a single heavy mat that is constrained by the bag, making it difficult to wash away. It is also possible to eliminate the need for stone material with a large grain size (for example, 300 to 1000 mm) for the bag body (bag body) 2 .
The first bag body (bag body) 1 has a thickness dimension of, for example, about 200 to 500 mm and a horizontal dimension of, for example, 10,000 mm, which is much larger than the thickness dimension. The thinness of the mat makes it less susceptible to ocean currents, and the large horizontal dimension makes the weight of one mat heavy, providing stability. Also, when punching with the post 3, the thickness is thin so that it can be easily punched (the part X passing through the second bag (bag) 2 and the first bag (bag) 1 is provided). if not).

Further, the weight of the filling material to be filled in the second bag body (bag body) 2 is, for example, 4.0t to 30t, and the particle size is 300mm or less. In addition, since the second bag (bag) 2 serves to improve the stability of the first bag (bag) 1, the second bag (bag) 2 Instead, stone materials with large grain sizes (eg, 300 to 1000 mm) may be used. Alternatively, the shape of the bag body may be not the substantially rectangular parallelepiped shape shown in FIGS. 2 and 4, but may be a bun-shaped bag body filled with filling material, or may be arc-shaped in plan view as shown in FIG. Or it is good also as a concrete block.

As described above, the support structure S includes the first bag (bag) 1 laid (installed in a laying manner) on the seabed (or water bottom) 1 and filled with the first filling material. , a second bag (bag) 2 placed on the first bag (bag) 1 and filled with a second filling material larger than the first filling material; Although a plurality of bags are laminated, depending on the situation, a single bag may be used.
That is, the support structure S in such a case includes a bag 1 filled with a filling material laid (installed in a laying manner) on the seabed (or seabed) 10, and a bag 1 that penetrates the seabed (or seabed) 10 and is filled with a filling material. (or the bottom of the water) 10 and supports 3 driven into the ground.
In the conventional anti-scouring sheet, the anti-scouring sheet is lifted by the influence of ocean currents or water currents, causing a problem of promoting scouring. As compared with the scouring-prevention sheet, the bag is less susceptible to ocean currents or water currents because it is filled with the filling material, and cannot be lifted, so that scouring can be prevented.
In addition, the construction method of the support structure includes a laying step of laying the bag 1 on the seabed (or water bottom) 10 filled with the filling material, and after this laying step, the bag 1 is penetrated and the seabed (or and a step of driving the pillars 3 into the ground of the water bottom 10 .
Even in this case, as in the case of the conventional anti-scouring sheet, the anti-scouring sheet is lifted by the influence of ocean currents or water currents, and scouring is accelerated. According to the construction method of (1), compared with the conventional anti-scouring sheet, the bag is less affected by ocean currents or water currents and cannot be lifted because it is filled with the filling material, so it is possible to prevent scouring. can.

Desirably, the part of the support 3 that penetrates the bag body 1 is not filled with the filling material, so that the driving operation of the support 3 can be facilitated.
Although not shown, the portion of the strut 3 that penetrates the bag 1 is partitioned by a partition member so that the portion of the strut 3 that penetrates the bag 1 is not filled with the filling material.
In addition, 51 shown in FIG. 1 is a first filling material, and 52 is a second filling material.

Moreover, the superimposition of the second bag body (bag body) 2 is not limited to the above description. For example, as shown in FIG. The first bag (bag) 2 may be spirally formed, or, as shown in FIG. 6, the long sides of the second bag (bag) 2 may be overlapped. By superimposing in this way, fine positioning is not required at the time of installation, and construction can be easily performed.

S support structure 1 first bag (bag)
2 Second bag (bag)
3 pillars 10 seabed (or seabed)

Claims (2)

A laying step of laying the bag filled with the filling material on the seabed or the bottom of the water;
A method of constructing a column structure, characterized by comprising, after the laying step, a step of driving the column into the ground of the seabed or the bottom of the sea by penetrating the bag body. The bag is formed of a net having a plurality of meshes, and the inside of the bag is divided by a plurality of partition members.
is formed into a plurality of small rooms partitioned by, and filling material is filled in each of the small rooms
The method for constructing a support structure according to claim 1, characterized in that :

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