WO2022225210A1

WO2022225210A1 - Underwater foundation construction method

Info

Publication number: WO2022225210A1
Application number: PCT/KR2022/004322
Authority: WO
Inventors: 김상기
Original assignee: (주)유주
Priority date: 2021-04-19
Filing date: 2022-03-28
Publication date: 2022-10-27
Also published as: KR102304302B1

Abstract

The present invention is for installing an underwater foundation in a precisely horizontal state on an irregular underwater surface, and comprises a foundation block assembly arrangement step, a guide pole installation step, a leveling step, an upper block installation step, a guide pole removal step, a ground hole forming step, and a concrete column forming step, in order to construct an underwater foundation in which a foundation block and an upper block are supported by a plurality of concrete columns.

Description

How to construct an underwater foundation structure

The present invention relates to a method for constructing an underwater foundation structure for supporting an offshore structure such as a large storage facility, a wind power plant, a tidal or wave power plant, and the like.

There is an increasing number of cases in which offshore structures such as large storage facilities, wind power generation facilities, and tidal or wave power generation facilities are built on the sea. do.

In the case of offshore wind power generation, an upper structure including a turbine and blades on the water surface, an underwater basic structure on which the upper structure is supported, and a ground fixing part for fixing the underwater basic structure to the underwater ground are included.

The underwater foundation structure as described above should be installed on the underwater ground, but the underwater ground is not flat but uneven and irregular.

When the underwater foundation structure is installed on such an irregular underwater ground, there is a problem in that it is difficult to secure the design verticality of the underwater foundation structure and the upper structure thereon.

Conventionally, when the underwater ground is irregular, divers and heavy underwater equipment are used to arrange and flatten the irregular underwater ground and then install the underwater foundation structure. There are many operational difficulties, such as an increase in the risk of safety accidents due to the work of divers.

In addition, in the prior art, since the lower part of the underwater foundation structure is only fixed to the ground by a separate pile, etc., the underwater foundation structure receives a lateral load due to a strong current, etc. In order to solve this problem, Although the weight is increased and the size is increased, there is a problem that not only the installation cost increases, but also the lateral load increases with the increase of the surface area.

The present invention has been devised to solve the problems of the prior art as described above, and the underwater foundation structure construction that can be installed according to the designed verticality of the upper structure by allowing the underwater foundation structure to be installed in an accurate horizontal state on the irregular underwater ground I would like to suggest a method.

In addition, the present invention is to propose a method for constructing an underwater foundation structure that can be firmly coupled to the underwater ground as a whole while minimizing the lateral load caused by the strong current.

In order to solve the above problems, the present invention is a pipe extending in the vertical direction, and includes a plurality of pipes for a first block having a female thread formed at the bottom and a first frame connecting the plurality of pipes for the first block to each other. In the form of a base block and a pipe extending in the vertical direction, a male screw screw-coupled to the female screw is formed at the lower portion, the lower end protrudes from the lower end of the pipe for the first block, and an upper end for shaft coupling is provided at the upper end for shaft coupling. A foundation block assembly preparation step of preparing a foundation block assembly comprising a plurality of pedestals for horizontal alignment including a ground support plate extending outward in a radial direction from the lower end of the formed pedestal pipe and the pedestal pipe; A guide pole preparation step of preparing a guide pole in the form of a pipe extending in the vertical direction, in which a lower end for shaft coupling is formed for shaft coupling to an upper end for shaft coupling of the pipe for the pedestal; An upper block preparation step of preparing an upper block including a plurality of pipes for a second block extending in the vertical direction and a second frame connecting the plurality of pipes for the second block to each other; After the foundation block assembly preparation step, the foundation block assembly arrangement step of disposing the foundation block assembly on the underwater ground; After the guide pole preparation step, a guide pole installation step of inserting the guide pole into the pipe for the first block so that the lower end for shaft coupling of the guide pole is shaft-coupled to the upper end for shaft coupling of the pedestal for horizontal alignment; After the base block assembly arrangement step and the guide pole installation step, the guide pole is rotated to rotate the guide pole and the pedestal for leveling by axial coupling, and the pipe for the pedestal of the pedestal for leveling is rotated a horizontal alignment step of aligning the horizontal alignment of the base block assembly by advancing the horizontal alignment pedestal downward by the screw coupling with the female screw of the first block pipe; After the base block assembly arrangement step and the guide pole installation step, the guide pole is inserted into the pipe for the second block of the upper block by lowering the upper block after positioning the upper block on the upper part of the guide pole an upper block installation step of installing the upper block on the upper part of the foundation block assembly; After the upper block installation step, a guide pawl removal step of removing the guide pawl; After the upper block installation step, a ground perforation forming step of perforating the underwater ground located in the lower part of the pipe for the pedestal through the inside of the pedestal pipe to form a ground perforation in the underwater ground; After the step of removing the guide pole and the step of forming the ground perforation, a metal reinforcing member extending in the vertical direction, a waterproofing film surrounding the lower and side portions of the metal reinforcing member, and unhardened concrete injected into the waterproofing membrane Inserting the concrete pillar forming part made of to the ground drilling part through the pipe for the pedestal, and the waterproofing film is in close contact with the upper block, the foundation block, the leveling pedestal, and the underwater ground by the pressure of the unhardened concrete. The unhardened concrete is cured, and the pipe for the second block of the upper block, the pipe for the first block of the foundation block, the pipe for the pedestal of the leveling pedestal, and the concrete extending in the vertical direction along the ground perforation part Concrete pillar forming step to form a pillar; It is characterized in that it includes.

As described above, the present invention can be installed according to the verticality in which the upper structure is designed so that the underwater foundation structure is installed in an accurate horizontal state on the irregular underwater ground.

In addition, the present invention minimizes the lateral load caused by the strong current, while the entire underwater foundation structure can be firmly coupled to the underwater ground.

1 is a cross-sectional view of a foundation block assembly according to a first embodiment of the present invention;

Figure 2 is an exploded cross-sectional view of Figure 1;

3 is a perspective view of the pedestal for leveling of FIG. 1;

4 is a cross-sectional view of a guide pole according to a first embodiment of the present invention;

5 is a perspective view of FIG. 4;

6 is a cross-sectional view of an upper block according to a first embodiment of the present invention;

7 is a conceptual diagram of a state in which the basic block assembly arrangement step according to the first embodiment of the present invention is performed;

8 is a conceptual diagram of a state in which the horizontal alignment step is performed after FIG. 7;

9 is a conceptual diagram of a state in which the upper block installation step is performed after FIG. 8;

10 is a conceptual diagram of a state in which the guide pawl removal step is performed after FIG. 9;

11 is a conceptual view of a state in which the ground hole formation step is performed after FIG. 10;

12 is a conceptual view of a state in which the concrete pillar forming step is performed after FIG. 11;

13 is a conceptual view of a state in which the upper structure installation step is performed after FIG. 12;

14 is a cross-sectional view of a foundation block assembly according to a second embodiment of the present invention;

15 is a cross-sectional view of an upper block according to a second embodiment of the present invention;

16 is a conceptual diagram of a state in which the basic block assembly arrangement step according to the second embodiment of the present invention is performed;

17 is a conceptual diagram of a state in which the horizontal alignment step is performed after FIG. 16;

18 is a conceptual diagram of a state in which the upper block installation step is performed after FIG. 17;

19 is a conceptual view of a state in which the guide pawl removal step and the ground hole formation step are performed after FIG. 18;

20 is a conceptual view of a state in which the concrete pillar forming step is performed after FIG. 19;

21 is a conceptual diagram of a state in which the upper structure installation step is performed after FIG. 20 .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

I. Example 1

First, a first embodiment according to the present invention will be described.

Figure 1 is a cross-sectional view of a foundation block assembly according to a first embodiment of the present invention, Figure 2 is an exploded cross-sectional view of Figure 1, Figure 3 is a perspective view of the leveling pedestal of Figure 1, Figure 4 is the first embodiment of the present invention A cross-sectional view of a guide pole according to an embodiment, FIG. 5 is a perspective view of FIG. 4, FIG. 6 is a cross-sectional view of an upper block according to a first embodiment of the present invention, and FIGS. 7 to 13 are a first embodiment of the present invention These are conceptual diagrams expressing the process of installing an underwater foundation structure by example in order.

(1) Foundation block assembly preparation step

First, the foundation block 110, the foundation block assembly 100 including the pedestal 120 for leveling is prepared (see FIGS. 1 to 3).

The basic block 110 includes a plurality of pipes 111 for the first block, and a first frame 112 connecting the plurality of pipes 111 for the first block to each other.

The first block for the pipe 111 is in the form of a pipe extending in the vertical direction, and a female screw 111a is formed in the lower portion.

In this embodiment, the first frame 112 includes a first upper plate frame 112a made of concrete and a first lower plate frame 112b made of concrete.

The lower end of the pipe 111 for the first block extends to the lower surface of the first lower plate frame 112b and the upper end extends upwardly so that the upper end protrudes upward from the upper surface of the first upper plate frame 112a.

A pedestal 120 for horizontal alignment is provided for each pipe 111 for the first block. Therefore, the pedestal 120 for horizontal alignment is provided in plurality.

Each of the pedestals 120 for leveling consists of a pedestal pipe 121 and a ground support plate 122 .

The pipe 121 for the pedestal is in the form of a pipe extending in the vertical direction, and the male screw 121a screwed to the female screw 111a of the pipe 111 for the first block is formed at the lower portion.

In addition, the lower end of the pedestal pipe 121 protrudes downward from the lower end of the first block pipe 111 (specifically, the lower surface of the first lower plate frame 112b).

The upper end of the pedestal pipe 121 is formed with an upper end for shaft coupling (121c) for shaft coupling. The shaft coupling upper end 121c is a portion where the shaft coupling lower end 141 of the guide pole 140 is coupled to rotate in conjunction with the guide pole 140 to rotate.

The upper end for shaft coupling (121c) is processed so that irregularities are repeated in a sawtooth shape along the upper main surface of the pipe 121 for the pedestal.

The ground support plate 122 is in the form of a horizontal plate extending radially outward from the lower end of the support pipe 121 .

The ground support plate 122 is a portion for contacting the underwater ground.

(2) Guide pole preparation step

A guide pole 140 as shown in FIGS. 4 and 5 is prepared.

The guide pole 140 is in the form of a pipe extending in the vertical direction, and the lower end 141 for shaft coupling is formed at the lower end.

The lower end 141 for shaft coupling is a portion for shaft coupling to the upper end 121c for shaft coupling of the pipe 121 for the pedestal. will be.

(3) Upper block preparation step

The upper block 200 as shown in FIG. 6 is prepared.

The upper block 200 includes a plurality of pipes 210 for a second block and a second frame 220 connecting the plurality of pipes 210 for a second block to each other.

The second block for the pipe 210 is in the form of a pipe extending in the vertical direction.

In this embodiment, the second frame 220 includes a second upper plate frame 221 made of concrete and a second lower plate frame 222 made of concrete.

The pipe 210 for the second block has a lower end extending to the lower surface of the second lower plate frame 222 and an upper end extending to the upper surface of the second upper plate frame 221 .

In addition, the pipe 210 for the second block has a shape in which the lower part is expanded compared to the upper part. Therefore, the pipe for the second block 210 may be divided into a pipe 211 for a second block 211 of a relatively small diameter at the top and a pipe 212 for a second block 212 with a relatively large diameter at the bottom.

The diameter of the pipe 211 for the 2-1 block is the same as the diameter of the pipe 111 for the first block, and the diameter of the pipe 212 for the 2-2 block is the upper end of the pipe 111 for the first block. has a diameter for being inserted and seated.

(4) foundation block assembly arrangement step

Performs the foundation block assembly arrangement step of disposing the foundation block assembly 100 on the underwater ground 10 as shown in FIG.

At this time, since the underwater ground 10 is not in a flat state, the foundation block assembly 100 is in a state that cannot be maintained horizontally.

(5) Guide pole installation step

The guide pawl installation step may be performed prior to performing the foundation block assembly placement step.

The guide pole installation step is to insert the guide pole 140 into the pipe 111 for the first block of the foundation block assembly 100 .

At this time, the guide pole 140 is installed so that the lower end 141 for shaft coupling of the guide pole 140 is shaft coupled to the upper end 121c for shaft coupling of the pedestal 120 for horizontal alignment.

If the guide pole 140 is installed before performing the base block assembly arrangement step in this way, the guide pole 140 in the base block assembly arrangement step is the underwater ground 10 together with the base block assembly 100 as shown in FIG. 7 . is placed on

Depending on the embodiment, the guide pole installation step may be performed after the foundation block assembly arrangement step is performed. In this case, the guide pole 140 should be installed on the foundation block assembly 100 disposed in the water.

(6) leveling step

7, the guide pole 140 is rotated to rotate the guide pole 140 and the pedestal 120 for horizontal alignment by shaft coupling, and the pedestal for horizontal alignment 120 rotates while the pipe for the first block (111) by screwing with the female screw 111a, the pedestal 120 for leveling is advanced to the lower side, and the ground support plate 122 of the pedestal for leveling 120 is supported on the underwater ground 10 while the foundation block assembly (100) is leveled (see FIG. 8).

This is done for each pedestal 120 for leveling.

The operation of rotating the guide pole 140 may be performed in a separate barge.

In some cases, if the upper block 200 is already installed above the water surface, the auxiliary work plate is placed on the upper block 200 or on the upper block 200, and the guide pole 140 is rotated on the auxiliary work plate. may do it

When performing the leveling step, the guide pole 140 can be rotated in a state in which the foundation block 110 is hung on a crane in the water (that is, the foundation block 110 is not in contact with the underwater ground 10). .

(7) upper block installation step

After FIG. 8 , as shown in FIG. 9 , the upper block 200 is placed on the upper part of the guide pole 140 , and then the upper block 200 is lowered to install the upper block 200 on the upper part of the base block assembly 100 . .

At this time, the upper block 200 is installed in a state in which the guide pole 140 is inserted into the pipe 210 for the second block of the upper block 200 .

Accordingly, the second lower plate frame 222 of the upper block 200 is seated on the upper portion of the first upper plate frame 112a of the basic block 110, and the pipe 212 for the 2nd-2 block of the upper block 200 is ) is inserted into the pipe 111 for the first block of the foundation block 110, the upper block 200 can be stably maintained in the installed state.

The upper block installation step may be performed after the leveling step or before the leveling step. That is, in some cases, the upper block may be installed first and a leveling step may be performed.

In this embodiment, it has been described that one upper block 200 is installed, but depending on the embodiment, a plurality of upper blocks 200 may be continuously installed in the vertical direction.

(8) Guide pawl removal step

After FIG. 9 , the guide pole 140 is removed to obtain the same state as in FIG. 10 .

(9) formation of the ground perforation

After FIG. 10 , as shown in FIG. 11 , the underwater ground 10 is drilled to form the ground perforation 11 in the underwater ground 10 .

Specifically, by drilling the underwater ground through the inside of the pipe 121 for the pedestal of the pedestal 120 for horizontal alignment, the ground perforation 11 is formed in the underwater ground located under the pipe 121 for the pedestal.

The step of forming the ground perforation may be performed after the step of removing the guide pawl, but the step of forming the ground perforation may be performed before the step of removing the guide pawl.

(10) Concrete Column Formation Stage

After FIG. 11 , the concrete pillar 300 is formed as shown in FIG. 12 .

The concrete column forming step consists of inserting the concrete column forming part 300 through the pedestal pipe 121 to the ground perforation part 11 .

The concrete pillar forming unit 300 includes a metal reinforcement member 301 extending in the vertical direction, a waterproofing membrane 302 surrounding the lower and side portions of the metal reinforcement member 301 , and a waterproofing membrane 302 inside. It is made by including the injected unhardened concrete (303, referred to as "fresh concrete".).

The metal reinforcing member 301 may be a general reinforcing bar assembly or an H-beam, a steel pipe, etc. may be adopted, and the shape may be variously changed, and the metal reinforcing member 301 will reinforce the strength of concrete.

When the concrete column forming part 300 is inserted up to the ground perforation part 11, the waterproofing film 302 is formed by the pressure of the unhardened concrete 303 by the upper block 200, the foundation block 110, and the pedestal for leveling. (120), the unhardened concrete 303 is cured while in close contact with the underwater ground 10, the pipe 210 for the second block of the upper block 200 and the pipe 111 for the first block of the foundation block 110 ) and a concrete column 300 extending in the vertical direction along the pipe 121 and the ground perforation 11 for the pedestal of the pedestal 120 for leveling is formed.

In the above and below, the same numbers are assigned to the concrete pillar forming part 300 and the concrete pillar 300 . This is because the concrete column forming part 300 is formed into the concrete column 300 by curing the unhardened concrete 303 .

Thereby, the underwater foundation structure according to an embodiment of the present invention is completed.

That is, the underwater foundation structure becomes a structure including a foundation block 110 , a pedestal for leveling 120 , an upper block 200 , and a plurality of concrete pillars 300 .

Since such an underwater foundation structure is installed in an accurately leveled state, the structure installed thereon can be installed accurately according to the design verticality.

In addition, this underwater foundation structure is the entire underwater foundation structure is strongly fixed to the underwater ground 10 by the concrete pillar 300, while the area receiving the lateral load is minimized, so that the overall compact design is possible.

(11) Installation of superstructure

After the underwater base structure is completed, various upper structures are installed on the upper part of the underwater base structure as shown in FIG. 13 .

In this embodiment, it is an offshore wind power plant including a turbine and blades as an upper structure.

In some cases, a large storage facility, wind power generation facility, tidal or wave power generation facility, etc. may be installed as the upper structure.

II. Example 2

Next, a second embodiment according to the present invention will be described.

Figure 14 is a cross-sectional view of the foundation block assembly according to the second embodiment of the present invention, Figure 15 is a cross-sectional view of the upper block according to the second embodiment of the present invention, Figures 16 to 21 are the second embodiment of the present invention These are conceptual diagrams that sequentially express the installation process of the underwater foundation structure by

(1) Foundation block assembly preparation step

The foundation block assembly 100 of this embodiment includes a foundation block 110 and a pedestal 120 for leveling (see FIG. 14 ).

The first block for the pipe 111 has a first expanded pipe portion 111b formed on the upper portion.

The first expanded pipe portion 111b is formed in a structure for inserting and seating the pipe 210 for the second block of the upper block 200 to be described later.

A clamping member 111c for clamping the pipe 210 for the second block of the inserted upper block 200 is provided in the first expanded pipe portion 111b. The clamping member 111c includes a clamp and a spring supporting the clamp.

In this embodiment, the first frame 112 is made of a section steel member such as an angle and a channel.

The description of the pedestal 120 for horizontal alignment will be omitted with reference to the first embodiment.

(2) Guide pole preparation step

The description of the guide pole 140 will be omitted with reference to the first embodiment.

(3) Upper block preparation step

The upper block 200 as shown in FIG. 15 is prepared.

In this embodiment, the second frame 220 is made of a section member such as an angle or a channel.

(4) foundation block assembly arrangement step

As shown in FIG. 16 , a foundation block assembly arrangement step of disposing the foundation block assembly 100 on the underwater ground 10 is performed.

(5) Guide pole installation step

As shown in FIG. 16 , the foundation block assembly 100 is disposed on the underwater ground 10 in a state in which the guide pole 140 is already installed.

(6) leveling step

After FIG. 16, the base block assembly ( 100) (see FIG. 17).

(7) upper block installation step

After FIG. 17 , as shown in FIG. 18 , the upper block 200 is placed on the upper part of the guide pole 140 , and then the upper block 200 is lowered to install the upper block 200 on the upper part of the base block assembly 100 . .

(8) guide pawl removal step

After FIG. 18 , the guide pole 140 is removed as shown in FIG. 19 .

(9) formation of the ground perforation

After FIG. 18 , as shown in FIG. 19 , the underwater ground 10 is drilled to form the ground perforation 11 in the underwater ground 10 .

(10) Concrete Column Formation Stage

After FIG. 19 , the concrete pillar 300 is formed as shown in FIG. 20 .

(11) Installation of superstructure

After the underwater base structure is completed, various upper structures are installed on the upper part of the underwater base structure as shown in FIG. 21 .

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

The present invention can be used to construct underwater foundation structures for supporting offshore structures such as large storage facilities, wind power plants, tidal or wave power plants, and the like.

Claims

In the form of a pipe extending in the vertical direction, a base block including a plurality of pipes for a first block having a female thread formed thereon and a first frame connecting the plurality of pipes for the first block to each other, and a pipe extending in the vertical direction The lower end of the pipe for the pedestal and the pipe for the pedestal in which a male screw threadedly coupled to the female screw is formed in the lower portion, the lower end protrudes downward from the lower end of the pipe for the first block, and an upper end for shaft coupling is formed at the upper end for shaft coupling. A foundation block assembly preparation step of preparing a foundation block assembly comprising a plurality of horizontal alignment supports including a ground support plate extending outward in the radial direction;

A guide pole preparation step of preparing a guide pole in the form of a pipe extending in the vertical direction, in which a lower end for shaft coupling is formed for shaft coupling to an upper end for shaft coupling of the pipe for the pedestal;

An upper block preparation step of preparing an upper block including a plurality of pipes for a second block extending in the vertical direction and a second frame connecting the plurality of pipes for the second block to each other;

After the foundation block assembly preparation step, the foundation block assembly arrangement step of disposing the foundation block assembly on the underwater ground;

After the guide pole preparation step, a guide pole installation step of inserting the guide pole into the pipe for the first block so that the lower end for shaft coupling of the guide pole is shaft-coupled to the upper end for shaft coupling of the pedestal for horizontal alignment;

After the base block assembly arrangement step and the guide pole installation step, the guide pole is rotated to rotate the guide pole and the pedestal for leveling by axial coupling, and the pipe for the pedestal of the pedestal for leveling is rotated a horizontal alignment step of aligning the horizontal alignment of the base block assembly by advancing the horizontal alignment pedestal downward by the screw coupling with the female screw of the first block pipe;

After the base block assembly arrangement step and the guide pole installation step, the guide pole is inserted into the pipe for the second block of the upper block by lowering the upper block after positioning the upper block on the upper part of the guide pole an upper block installation step of installing the upper block on the upper part of the foundation block assembly;

After the upper block installation step, a guide pawl removal step of removing the guide pawl;

After the upper block installation step, a ground perforation forming step of perforating the underwater ground located in the lower part of the pipe for the pedestal through the inside of the pedestal pipe to form a ground perforation in the underwater ground;

After the step of removing the guide pole and the step of forming the ground perforation, a metal reinforcing member extending in the vertical direction, a waterproofing film surrounding the lower and side portions of the metal reinforcing member, and unhardened concrete injected into the waterproofing membrane Inserting the concrete pillar forming part made of to the ground drilling part through the pipe for the pedestal, and the waterproofing film is in close contact with the upper block, the foundation block, the leveling pedestal, and the underwater ground by the pressure of the unhardened concrete. The unhardened concrete is cured, and the pipe for the second block of the upper block, the pipe for the first block of the foundation block, the pipe for the pedestal of the leveling pedestal, and the concrete extending in the vertical direction along the ground perforation part Concrete pillar forming step to form a pillar;

Underwater foundation structure construction method comprising a.