KR20240109618A - Pilling template fixed to the first installed pile of foundation and construction method with it - Google Patents

Abstract

The present invention is a foundation pile pattern distributed in a plurality of zones in an offshore wind power plant, a foundation pile installation template for installing the first foundation pile in the foundation pile pattern on a soil or rock layer, and fixing it to the first foundation pile. Conventionally, the template is placed on the seafloor and the foundation pile is temporarily fixed to the template, so the weight and size of the template are increased to prevent the template from falling over. As the size of the template increases, challenges such as increased production costs and increased construction time arise.
Accordingly, the present invention fixes the template using the first basic pile constructed, thereby significantly reducing the weight of the template, thereby reducing production costs and reducing handling equipment.
Additionally, the first foundation pile can be constructed offshore while the template is being designed, shortening the overall construction period.

Description

Template for installing piles fixed to the first foundation pile and construction method using the same {Pilling template fixed to the first installed pile of foundation and construction method with it}

The present invention is a pile driving template fixed to the first foundation pile and a construction method using the same. More specifically, it is a template for adjusting the spacing and height of the foundation pile underwater, a plurality of foundation piles supporting a jacket structure in offshore wind power, and a construction method using the same. The present invention discloses a new template that effectively prevents overturning during foundation pile work and reduces the size and weight of the template, and relates to a method of constructing foundation piles in rock and soil layers using the template of the present invention.

Jacket structures are being used as underwater structures to support offshore wind power. The jacket structure is supported by a plurality of foundation piles installed in the ground. The method of constructing these foundation piles in advance underwater and assembling them by placing the jacket on top of the foundation piles is called the free piling method. Template equipment is required to first construct the foundation piles on the ground to match the jacket structure.

Figure 1 illustrates a template used conventionally. The template usually weighs more than 800 tons, and the template used for rock layers weighs about 1,300 tons.

Figure 2 explains why conventionally used templates must be large and heavy. Figure 2 (a) is a photograph of a template installed underwater and a foundation pile temporarily fixed through a through hole in the template, and Figure 2 (b) illustrates the hydraulic pressure acting on the foundation pile on the water. Before being installed on the ground, the foundation pile is vulnerable to falling, so the weight and size of the template are used to prevent the foundation pile from falling.

Figures 3 (a) to (c) show a conventional method of driving a foundation pile temporarily supported on a template into water and separating the template.

When the ground includes a rock layer, a temporary structure is installed as shown in (a) of Figure 14, as disclosed in the conventional invention patent "Pre-piling construction device for marine jacket structure," and after installing the foundation pile, the temporary structure is dismantled. And the jacket structure can be transported and installed as shown in (b) of Figure 14.

In the free piling method of constructing foundation piles first, in order to keep the spacing and height between multiple foundation piles constant regardless of whether the ground condition is soil or rock, the foundation piles are temporarily fixed and the foundation piles are constructed through driving or drilling.

KR 10-2392135 B1

To apply the free piling method of constructing foundation piles first, a template is first installed in the ground. Since the installed template temporarily fixes the foundation pile, the template is made heavy and large to prevent overturning due to external force transmitted to the foundation pile. Conventional heavy templates take a long time to be manufactured, are expensive to manufacture, and have the inconvenience of having to use very large marine equipment to use them at sea.

And in the rock layer, there is the hassle of installing a temporary structure in advance, constructing foundation piles, dismantling the temporary structure again, and transporting and installing the jacket structure.

The present invention is a solution to reduce the weight of the template used conventionally,

In a fixed offshore wind farm consisting of a foundation pile pattern installed in multiple zones

In each foundation pile pattern, the first foundation pile is installed in the soil layer or rock layer using the work line,

a submersible height gauge to measure the position of the first foundation pile to reach the design depth of underwatering the top of the first foundation pile being driven;

A template for installing foundation piles, including a support portion supporting the outside or inside of the first foundation pile, a through hole through which the nth foundation pile (n=2, 3,..) passes in the foundation pile pattern, and a main body portion connecting the through holes. ,

A template support unit that secures the template to the first foundation pile by operating in close contact with the outer or inner surface of the first foundation pile,

This is achieved by a template for pile installation being fixed to a first foundation pile, which includes a template guidance system for guiding the position of the first foundation pile in the water by lowering said template into the water using a work boat.

In addition, the underwater height measuring device has one end of the measuring frame exposed to the water and equipped with a GPS system to provide real-time height information using artificial satellites, and one or more underwater sensors among laser, ultrasonic, proximity, and touch sensors are installed underwater. This is achieved by measuring the height of the first foundation pile, and the measuring frame is equipped with a height adjusting device to maintain the height of the underwater sensor constant in conjunction with the GPS system.

In addition, the template guidance system includes at least one of a guidance frame fixed to the first basic pile and exposed to the water at one end, or a guidance camera installed on the template.

Additionally, the pad installed at the bottom of the template functions as a reaction force so that the height adjustment system of the template operates.

The pad can be installed separately from the template or together with the template.

In order to install the first foundation pile in the rock layer, it penetrates the underwater soil layer and is built on the top of the rock layer, and further includes a guide pile with one end exposed to the water.

In addition, it is achieved by a template for pile installation fixed to the first foundation pile, which further includes a foundation pile height adjustment device that is fixed to the guide pile and adjusts the height of the first foundation pile installed in the rock socket of the rock layer.

A construction method using a pile installation template fixed to the first foundation pile is an offshore wind farm equipped with a plurality of foundation pile patterns,

In each foundation pile pattern, moving to another foundation pile pattern area while installing only the first foundation pile in the soil layer or rock layer using a work line;

Installing the first foundation pile underwater, but checking the height of the first foundation pile exposed underwater using a GPS system to match the design height;

Installing the template by lowering it into the water on the first foundation pile installed underwater using a template guidance system;

fixing the template to the outer surface of the first foundation pile using a template support system;

Achieved by a construction method using a template fixed to the first foundation pile, which includes the step of fixing the template, installing the nth foundation pile into the ground through the through hole of the template, moving to another foundation pile pattern area, and fixing the template. do.

The effects of the present invention include

1. Conventionally, the weight and size of the template were used to prevent the template from falling during foundation pile construction, but the template can be made stable by using pre-installed foundation piles, so the size and weight of the template can be reduced.

2. The size and weight of the template can be reduced, speeding up template production and reducing production costs.

3. The weight of the template is light, which allows the size of the work vessel operating the template to be greatly reduced.

4. In offshore wind power, it takes at least 3 months to finalize the specifications of the foundation pile and design a suitable template. While designing the template, foundation piles can be constructed one by one at sea and scour prevention devices can be installed. This can shorten the overall construction period.

Figures 1 to 3 are examples of templates used in existing soil layers.
Figures 4 to 13 are examples of the template of the present invention applied to the soil layer and the construction of foundation piles using the template.
Figure 14 is an example of constructing foundation piles in an existing rock layer.
Figures 15 to 19 are examples of the template of the present invention applied to a rock layer and the construction of foundation piles using the template.

Hereinafter, the present invention will be described using the attached drawings.

Figures 1 and 2 are examples of templates currently in use. Install the template in hand and temporarily fix the basic file to the template. To prevent the foundation pile under hydraulic pressure from falling over, the width of the template is lengthened and the weight of the template is increased.

Figures 3 (a) to (c) are examples of driving a foundation pile temporarily fixed to a template, installing it in the ground, and separating the template from the foundation pile in a conventional method.

Figure 4 (a) is an example of the first foundation pile 401 passing through the gripper 100 for adjusting the pile position, and an underwater height measuring device 200 is installed on one side of the gripper for adjusting the pile position.

The gripper 100 for adjusting the pile position includes a gripper frame 110 and a gripper cylinder 120, inserts the first foundation pile 401 and the nth foundation pile 402 into the soil layer 10, and inserts the gripper cylinder 120 into the soil layer 10. ) can be operated forward, backward, left and right to precisely maintain verticality.

Figure 4(b) illustrates the underwater height measuring instrument 200. The underwater height measuring device uses a hammer (30) to drive the first foundation pile (401) into the soil layer, and when the top of the first foundation pile (401) reaches the design height underwater, the first foundation pile (401) is measured underwater. It measures the position of and tells you the moment to stop driving.

The underwater height measuring device 200 is equipped with a measuring frame 210 from the water to the underwater, and a GPS system 230 on the water receives signals from satellites and provides the location and height value in real time. An underwater sensor 240 is provided underwater to measure the height of the first foundation pile or the position of the hammer. It is desirable to use any one or more of a laser, ultrasonic wave, water pressure gauge, guidance camera, proximity sensor, probe, or touch sensor as the underwater sensor 240.

In addition, it is desirable to equip the underwater height measuring device 200 with a measuring device height adjustment device 250 to analyze information from the GPS system and move the height of the measuring device frame 210 or the position of the underwater sensor 240. , the measuring instrument height adjustment device 250 preferably includes a hydraulic, electric cylinder, and winch.

Figure 5 (a) illustrates the basic pile pattern 400 and is an example of constructing the first basic pile 401 on the basic pile pattern using the work line 50. As an example, the basic file pattern 400 consists of the first basic file 401 and the nth basic file (n=2,3,..) 402.

Figure 5 (b) is an example of driving the first foundation pile 401 underwater and reaching the design height by driving it using the underwater height measuring device 200.

6 to 7 are examples of installing the template guidance system 501 inside 401 of the first basic file. One of the template guidance systems involves inserting a guiding frame 501(1) into the interior of the first foundation pile 401, exposing one end to the water phase.

Figure 8 is an example of installing the template 500 in the first basic file 401. It is a structure that descends along the template guidance system 501 exposed to the water. It is preferable that the through hole 540 of the template is provided with a guide means 530 to touch the outer surface of the foundation piles 401 and 402. The template is equipped with a template support portion 510 to temporarily install the nth foundation pile (n=2,3,..) 402 on the template 500 by fixing the outer surface of the first foundation pile 401. It is desirable to keep the template 500 in a stable state with respect to conduction.

Figure 9 is a detailed operation description of the support portion 510 of the template. 9 a-a illustrates a state in which the outer surface of the first foundation pile 401 is fixed using the template support portion 510, and cross section b-b illustrates the support operation portion 511 of the template support portion 510.

The support operating unit 511 is preferably operated in a wedge shape, directly compressed on the outer surface, or tightened in a belt manner while wrapping around the outer surface of the foundation pile.

Additionally, the support portion 510 of the template may be inserted and fixed to the inner surface of the first foundation pile 401 (not shown).

In addition, the main body portion 550 constituting the template 500 has a closed space inside as shown in cross section c-c, so it is desirable to reduce the weight of the template underwater by utilizing buoyancy.

Figures 10 (a) and (b) illustrate the guidance camera (501(2)) method of another template guidance system 501, and maintain the template in a horizontal state after installing it in water. A winch (520(1)) is exemplified as one of the template height adjustment systems 520. The winch is installed on a work line, one side of the winch wire is installed on the template, and the template is moved to level the template 500. can be maintained.

Figure 11 is an example of installing the measuring instrument foundation 220 to ensure stability when installing the underwater height measuring instrument 200 on the sea floor. It is desirable to include a suction pile with the meter base 220.

FIG. 12 illustrates that the template height adjustment system 520 uses a leveling cylinder 520(2) to keep the template horizontal.

Additionally, it is desirable for the pad to move in conjunction with the template.

In addition, the leveling cylinder (520(2)) operates using the pad 610 placed on the sea floor as a reaction force.

Figure 13 is an example of first installing the pad assembly 600 on the seafloor. The pad assembly 600 is integrated using a temporary coupling portion 620 and is installed on the soil layer of the sea floor, and it is desirable to separate the temporary coupling portion.

The pad assembly 600 is preferably manufactured using riprap, steel, and reinforced concrete.

Figure 14 shows a conventional method, where, when the foundation pile is settled in the rock layer, the temporary structure is extended and installed to the water as shown in (a), the foundation pile is constructed, and then the temporary structure is dismantled and the jacket structure is installed as shown in (b). This is an example of transporting and installing on foundation piles.

In (a) of FIG. 15, the soil layer 10 is drilled using the drilling equipment 40 on the work boat 50, and the rock socket 404 is installed in the rock layer using the guide pile 403 installed on the top of the rock layer 20. This is an example of making it. Figure 15 (b) shows that the first foundation pile 401 is installed through the inside of the guide pile 403, the GPS system 230 and the measuring instrument foundation 220 are installed on the guide pile, and the foundation pile height adjustment device ( This is an example of adjusting and fixing the height of the first foundation pile 401 using 251).

Here, it is desirable to use any one of a hydraulic cylinder, a crane, and a winch as the basic pile height adjustment device 251.

Figure 15 (c) is an example of fixing the first foundation pile 401 and the rock layer 20 by pouring grout 405 into the rock socket 404.

Figure 16 (a) illustrates a plurality of basic file patterns 400. The basic pile pattern preferably includes the first basic pile 401 and the nth basic pile 402, and each first basic pile ( It is desirable to move while installing 401).

Figure 16 (b) is an example of constructing the first foundation pile 401 in the rock layer and recovering the guide pile 403 using the vibro hammer 30.

Figure 17 (a) illustrates a state in which the guide pile is recovered and the first basic pile 401 is exposed underwater, and Figure 17 (b) shows a guidance camera (( This is an example of installing the template 500 on the first foundation pile using 501(2)). Cross section a-a illustrates the template, and it is desirable to have at least three through holes in the template.

Figure 17 (c) is an example of constructing the guide pile 403 to construct the nth foundation pile (n=2, 3,...) using the template 401.

Figure 18 (a) is another example of the present invention, in which the first foundation pile 401 is installed in the rock layer and the guidance frame (520(1)) is installed inside the first foundation pile using the template guidance system 520. This is an example of installation.

Figure 18 (b) is an example of installing the template 500 in water using the template guidance system 520.

Figures 19 (a) and (b) show another type of template of the present invention. After fixing the first basic file 401, the template 500 is formed using the guide file 403 while maintaining the guide file 403. ) is desirable to fix. The template 500 can be installed on the water or underwater.

It is desirable to install a leveling cylinder (520(2)) as a template height adjustment system (520) on the work line to adjust the level of the template.

Although not shown in the drawing, the above-mentioned floating template and underwater template can be combined with each other, fixed to a guide pile, and a leveling cylinder provided on a work boat can be utilized.

10: Soil layer 20: Rock layer 30: Hammer 40: Drilling equipment 50: Work boat
100: Gripper for file position adjustment
110: Gripper frame 120: Gripper cylinder
200: Underwater height measuring device
210: Measuring device frame 220: Measuring device basics 230: GPS system
240: underwater sensor 250: measuring instrument height adjustment device
251: Foundation pile height adjustment device
400: Basic file pattern
401: first basic file 402: nth basic file (n=2,3,..)
403: Guide file
404: rock socket 405: grout
500: Template
501: System for template derivation
501(1): Guidance frame 501(2): Guidance camera
510: Support part for fixing the template 511: Support operation part
520: Template height adjustment system
520(1): winch 520(2): leveling cylinder
530: guide means 540: through hole
600: Pad assembly
610: Pad 620: Temporary coupling part

Claims (5)

A foundation pile for supporting an offshore wind power jacket structure, and a foundation pile installation device for installing the foundation pile at a designated location on the sea floor,
In the foundation pile pattern 400 having three or more pieces, the first foundation pile 401 is constructed independently on the sea floor and the top is exposed underwater;
A fixing part 510 fixed to the inner or outer surface of the first foundation pile 401 installed underwater;
A fixing part 510 that supports the outside or inside of the first basic pile 401 and a guide part 540 that passes the nth basic pile (n=2,3,..) 402 in the basic pile pattern, A template for installing a file that is fixed to the first basic pile, including a template (500) including a frame portion (550) connecting the guide portion. In clause 1,
A file fixed to the first foundation pile further comprising an operating device 511 for the fixing part that fixes the fixing part of the template 500 to the first basic pile by operating in close contact with the outer or inner surface of the first basic pile. Template for installation. According to paragraph 1 or 2,
In order to guide and install the file installation template 500 on the first foundation pile 401 installed independently in the foundation pile pattern 400, a template guidance system 501 provided on the first foundation pile or template 500 is installed. ); A template for the installation of files anchored to the first foundation file further containing; In clause 3,
After fixing the fixing part of the template 500 to the first foundation pile, the guide part installs the nth foundation pile 402 of the template 500 to level the template in water based on the height of the fixing part. A template height adjustment system ( 520); A template for installing a pile fixed to the first foundation pile further comprising; A method of constructing foundation piles in an offshore wind farm having a plurality of identical foundation pile patterns,
Installing the first foundation pile (401) in the soil layer or rock layer using a work line in each foundation pile pattern;
The fixture is first installed using a template guidance system 501 including a guidance frame 501(1) provided on the first basic file 401 or a guidance camera 501(2) provided on the template. guiding the fixing part 510 to the first basic pile and operating the operating device 511 to fix the fixing part 510 to the first basic pile 401;
Maintaining the template level by operating the template height adjustment system 520 while the fixing part 510 is fixed to the first foundation pile;
After maintaining the level of the template 500, the nth foundation pile 402 is installed on the seafloor through the guide part of the template, and the nth foundation pile (402) is installed on the seafloor based on the top height of the first foundation pile 401 underwater ( 402) Completing the foundation pile pattern by adjusting the height of the foundation pile underwater using the foundation pile height adjustment device 251. A construction method using a template fixed to the first foundation pile, including.