KR102245582B1 - Method for footing Jack up Barge using Mudmat - Google Patents

Abstract

The present invention relates to a jack-up barge support method using a mud mat. More specifically, a ground support method for a jack-up barge for constructing a marine wind power generation system includes: a first step of manufacturing a mud mat, having a latticed shape and having a jack-up barge leg footed in an upper part, at a factory; a second step of shipping a plurality of manufactured mud mats into a barge for marine transportation, and moving the same to a marine foundation structure together with a jack-up barge; a third step of locating the jack-up barge by a specific distance apart from the marine foundation structure, and confirming and marking a position for the installation of a mud mat in an area between the jack-up barge and the marine foundation structure; a fourth step of installing each of the mud mats shipped in the barge for marine transportation on each marked position by using a crane of the jack-up barge; and a fifth step of placing each jack-up barge leg on each of the mud mats and constructing a marine wind power generation system.

Description

Method for footing Jack up Barge using Mudmat}

The present invention relates to a method for supporting jack-up pants using a mud mat.

Today, due to the excessive use of fossil fuels, environmental pollution is increasing day by day, and interest in eco-friendly renewable green energy is increasing. Such renewable green energy has large natural constraints and is less economically efficient than fossil energy, but is attracting attention as an alternative energy in terms of being environmentally friendly and capable of solving the problem of depletion of fossil energy and environmental pollution. Among these new energy sources, wind power generation, a representative green energy, is currently in operation both domestically and abroad. It is a trend.

Offshore wind power generation systems account for at least 30% of the total cost of the construction and installation of the foundation structure, as the proportion of the project cost to offshore foundation structures is relatively higher than that of turbines, and as the water depth increases, it increases to about 50%.

In addition, in order to construct such an offshore wind power generation system, after constructing a foundation structure on the ground, a jack-up barge line must be positioned in a position close to it.

However, due to the subsidence of the ground, there is a problem that the jack-up barge line is not fixed to the ground, and support stability and sliding risk occur.

The ground subsidence depends on the ground conditions and load conditions, and the ground subsidence of the jack-up pants must be supported in accordance with the ground conditions and load conditions.

Figure 1a shows a block diagram of a jack-up pants support using a conventional steel frame. Jack-up pants leg support using such a steel frame can secure support by extending the tread surface of Jack Up Barge Footing. The size is about 10M * 10M and the weight is about 215 tons (plate + H beam), the construction period is about 2 days, and the manufacturing time is about 3 weeks. Supporting the jack-up pants using such a steel frame has the advantage that manufacturing and installation period and cost are low, but there is a risk of sliding during the jack-up, so there is a problem that it is necessary to compensate for the sliding risk through rubber.

Figure 1b shows a configuration diagram of a jack-up trousers support using a conventional steel pile. The deep foundation using steel piles is constructed to reinforce the support by pile reinforcement at the point of installation of the jack-up pants. This method has the advantage of securing stability against subsidence by reinforcing the ground and securing stability against sliding during jack-up, but it has disadvantages of long pile production and installation time, and high cost.

Figure 1c shows a configuration diagram using a conventional ground replacement method using stony stone. As shown in Fig. 1c, it corresponds to a method capable of reinforcing the supporting force by reinforcing the ground using sandstone at the point where the jack-up pants are installed. This method has the advantage that the manufacturing period is short, but there is a risk of sliding and rubble foundation damage during jack-up. If the ground level is not secured after dropping the sandstone, there is a problem that it is difficult to check the level of the ground, and reuse is not possible due to the existence of a jack-up pants fall list, and there is a concern that civil complaints may arise when dropping the sandstone.

Korean Patent Registration 10-1657672 Republic of Korea Patent Publication 10-2014-0132363 Republic of Korea Patent Registration 10-0418268

Therefore, the present invention was conceived to solve the conventional problems as described above, and according to an embodiment of the present invention, the production period is short by using a mud mat, and stability against ground subsidence can be secured, and sliding during jack-up. Its purpose is to provide a method of supporting jack-up pants using a mud mat that can secure stability against and reusable.

On the other hand, the technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned are clearly to those of ordinary skill in the technical field to which the present invention belongs from the following description. It will be understandable.

An object of the present invention, in the ground support method of the jack-up pants for constructing an offshore wind power generation system, the first step of manufacturing a mud mat in a factory having a grid shape, and the jack-up pants leg is footed on the upper portion; A second step of loading the produced mud mats to the pants for sea transportation, and moving them to the side of the marine superstructure together with the jack-up pants; A third step of positioning the jack-up pants to be spaced apart from the offshore superstructure at a specific interval, and confirming and displaying a position to install the mud mat in the area between the jack-up pants and the offshore superstructure; A fourth step of installing each of the mud mats shipped to the sea transport trousers at each marked position using a crane of the jack-up trousers; A fifth step of installing each of the jack-up pants legs on each of the mud mats and constructing an offshore wind power generation system; may be achieved as a jack-up pants support method using a mud mat.

And installing a buoy for dismantling the mud mat on the mud mat between the fourth and fifth steps.

In addition, after the fifth step, after constructing the offshore wind power generation system, after confirming the position of the mud mat through the buoy, lift each of the mud mats using the jack-up pants crane equipped with GPS and dismantle, It may be characterized in that it comprises the step of loading the barge for sea transportation.

And in the first step, the mud mat, a lower plate, a first direction reinforcing material disposed on the lower plate at a specific distance from each other, and a second direction reinforcing material perpendicular to the first direction and disposed at a specific distance from each other. And, a guide pants frame provided on the lower plate and on which the jack-up pants leg is seated, and a connecting ring for fixing the jack-up pants crane hook when the buoy is installed and dismantled.

In addition, in the third step, GPS for checking coordinates provided above the pipe to check coordinates in the jack-up pants, a weight provided at the bottom of the pipe, and a horizontal blister for checking the horizontality of the pipe. A frame body may be installed in an area between the jack-up pants and the marine superstructure, the GPS coordinate value may be checked, and an identifier may be displayed at a location where the mud mat is to be installed.

According to the method for supporting jack-up pants using a mud mat according to an embodiment of the present invention, the production period is short using the mud mat, stability against ground subsidence can be secured, and stability against sliding during jack-up can be secured. , Has an effect that can be reused.

On the other hand, the effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art from the following description. I will be able to.

The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description of the present invention, so the present invention is limited only to the matters described in such drawings. And should not be interpreted.
Figure 1a is a configuration diagram of a jack-up pants support using a conventional steel frame,
Figure 1b is a configuration diagram of a jack-up pants support using a conventional steel pile,
Figure 1c is a configuration diagram using a conventional ground replacement method using sandstone,
Figure 2 is a flow chart of a jack-up pants support method using a mud mat according to an embodiment of the present invention,
3A is a plan view of a mud mat according to an embodiment of the present invention,
3B is a front view of a mud mat according to an embodiment of the present invention,
3C is a side view of a mud mat according to an embodiment of the present invention,
4 is a plan view of pants for sea transportation in which a mud mat is loaded according to an embodiment of the present invention,
5 is a plan view of a jack-up pants and pants for sea transportation set at sea according to an embodiment of the present invention,
Figures 6a and 6b are side views of the maritime superstructure according to an embodiment of the present invention, jack-up pants, and pants for maritime transport loaded with mud mats;
7 is a configuration diagram of a GPS frame body for checking coordinates according to an embodiment of the present invention;
Figure 8 is a side view of a state in which the GPS frame body for checking coordinates according to an embodiment of the present invention is moved to a mud mat installation position;
9 is a plan view of a state in which identifiers are displayed at four points outside the mud mat installation location according to an embodiment of the present invention;
10A is a plan view of a state in which mud mats 1 and 2 are installed according to an embodiment of the present invention;
10B is a side view of a state in which mud mats 1 and 2 are installed according to an embodiment of the present invention;
11A is a plan view of a state in which mud mats 3 and 4 are installed according to an embodiment of the present invention;
Figure 11b is a side view of a state in which mud mats 3 and 4 are installed according to an embodiment of the present invention;
12 is a side view of the mud mat in which a buoy for release is installed according to an embodiment of the present invention;
13 is a jack-up pants crane hook installed with GPS according to an embodiment of the present invention,
14 is a side view of a mud mat lifting operation state using a jack-up pants crane hook installed with a GPS according to an embodiment of the present invention;
15 is a plan view showing a state in which the mud mat disassembled according to an embodiment of the present invention is shipped to the trousers for transportation.

The above objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments related to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

In the present specification, when a component is referred to as being on another component, it means that it may be formed directly on the other component or that a third component may be interposed therebetween. In addition, in the drawings, the thickness of the components is exaggerated for effective description of the technical content.

Embodiments described herein will be described with reference to cross-sectional views and/or plan views, which are ideal exemplary views of the present invention. In the drawings, thicknesses of films and regions are exaggerated for effective description of technical content. Therefore, the shape of the exemplary diagram may be modified by manufacturing technology and/or tolerance. Accordingly, embodiments of the present invention are not limited to the specific form shown, but also include a change in form generated according to the manufacturing process. For example, an area shown at a right angle may be rounded or may have a shape having a predetermined curvature. Accordingly, the regions illustrated in the drawings have properties, and the shapes of the regions illustrated in the drawings are intended to illustrate a specific shape of the region of the device and are not intended to limit the scope of the invention. In various embodiments of the present specification, terms such as first and second are used to describe various elements, but these elements should not be limited by these terms. These terms are only used to distinguish one component from another component. The embodiments described and illustrated herein also include complementary embodiments thereof.

The terms used in the present specification are for describing exemplary embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, "comprises" and/or "comprising" does not exclude the presence or addition of one or more other components.

In describing the specific embodiments below, a number of specific contents have been prepared to explain the invention in more detail and to aid understanding. However, a reader who has knowledge in this field enough to understand the present invention can recognize that it can be used without these various specific contents. In some cases, it is mentioned in advance that parts that are commonly known in describing the invention and are not largely related to the invention are not described in order to prevent confusion without any reason in describing the invention.

Hereinafter, a method for supporting jack-up pants using a mud mat according to an embodiment of the present invention will be described. The present invention relates to a ground support method of the jack-up pants 30 for constructing an offshore wind power generation system. According to the method for supporting jack-up pants using a mud mat according to an embodiment of the present invention, the production period is short by using the mud mat 10, stability against ground subsidence can be secured, and stability against sliding during jack-up is secured. Can be done, and can be reused.

First, Figure 2 shows a flow chart of a jack-up pants support method using a mud mat according to an embodiment of the present invention.

As shown in Figure 2, first, after manufacturing and transporting the mud mat 10 (takes about 2 days), after setting the tip of the jack-up pants 30, inserting a diver to confirm the installation location, After installing the mud mat 10 and checking the condition of the mud mat 10, move the jack-up pants 30 to place the jack-up pants leg 31 on the mud mat 10, and then start the offshore wind power generation system. It can be seen that after the construction and construction is completed, the mud mat 10 is dismantled.

Hereinafter, the configuration and method of each of these steps will be described in more detail.

First, a mud mat 10 having a grid shape and on which the jack-up pants legs 31 are footed is manufactured in a factory. 3A is a plan view showing a mud mat 10 according to an embodiment of the present invention. And Figure 3b shows a front view of the mud mat 10 according to an embodiment of the present invention, Figure 3c shows a side view of the mud mat 10 according to the embodiment of the present invention.

As shown in FIGS. 3A to 3C, it can be seen that the mud mat 10 according to the embodiment of the present invention includes a lower plate 11 and a reinforcing material in a grid shape on the lower plate 11.

The reinforcing material includes a plurality of first-direction reinforcements 12 disposed at a specific distance from each other, and a plurality of second-direction reinforcing materials 13 perpendicular to the first direction and disposed at a specific distance from each other. These reinforcing members 12 and 13 may be composed of an H beam, an I beam, or the like.

And the mud mat 10 according to the embodiment of the present invention is provided with a square guide pants frame 14 on the lower plate 11, as shown in FIGS. 3A and 3C, such a guide pants frame 14 It can be seen that the jack-up pants leg 31 is configured to be seated.

And, as shown in Figure 3b, it is possible to fix the shackle 17 so that the buoy 16 can be installed, and is configured to include a link 15 for fixing the jack-up pants crane hook 33 when dismantling Can be seen.

Then, the produced mud mats 10 are shipped to the pants 20 for sea transportation. Figure 4 shows a plan view of the marine transport pants 20 in which the mud mat 10 is loaded according to an embodiment of the present invention. As shown in Fig. 4, it can be seen that four mud mats 10 are shipped by berthing the pants 20 for sea transportation.

And the sea transport pants 20 together with the jack-up pants 30 are moved to the sea superstructure (1) side. 5 is a plan view showing a jack-up pants 30 and pants 20 for sea transportation set at sea according to an embodiment of the present invention. As shown in Fig. 5, the jack-up pants 30 are set by maintaining a separation distance of 29m or more from the marine superstructure 1, and the mud mat sea transportation pants 20 are docked on the starboard of the jack-up pants 30. Able to know.

And the diver will confirm the installation location of the mud mat (10). 6A and 6B are side views of the marine superstructure 1, the jack-up pants 30, and the pants 20 for sea transportation in which the mud mat 10 is loaded according to an embodiment of the present invention. As shown in Figure 6a, it can be seen that the diver checks the position of the mud mat 10 in the area between the jack-up pants 30 and the marine superstructure (1). 2 persons: diver (shift), 1 person: signalman)). And, as shown in FIG. 6B, it can be seen that in order to prevent accidents that may occur during the diving operation in a group of 3 people, a safety state is maintained by wirelessly at all times with a diver.

In addition, the manufactured GPS frame body 40 for checking coordinates is moved to the installation location of the mud mat 10. 7 shows a configuration diagram of a GPS frame body 40 for checking coordinates according to an embodiment of the present invention.

As shown in FIG. 7, the GPS frame body 40 for checking coordinates includes a pipe 41, and a GPS 42 for checking the coordinates in the jack-up pants 30 provided above the pipe 41 and , It can be seen that it is configured to include a lifting lug 43, a weight 44 provided at the lower end of the pipe 41, and a horizontal blister 45 for checking the horizontality of the pipe 41.

That is, the frame body 40 for GPS installation is manufactured using the pipe 41 for steel pipe scaffolding, and the GPS 42 is installed on the upper part to check the coordinates from the top of the jack-up pants 30. In addition, two horizontal blisters 45 (simultaneous checking of X and Y axes) are installed to check the right angle of the GPS frame body 40 for checking coordinates on the sea floor, and the lower part of the GPS frame body 40 for checking coordinates In order to minimize the impact, a weight 44 is installed.

8 is a side view showing a state in which the GPS frame body 40 for checking coordinates according to an embodiment of the present invention is moved to an installation position of the mud mat 10. As shown in Fig. 8, the manufactured GPS frame body 40 is moved to the mud mat 10 installation position, and the diver checks the condition of the sea floor in the mud mat 10 installation area (inclination and obstacles Confirm).

And, after checking the coordinates of the upper GPS (42) during installation and positioning it correctly, the diver places the two horizontal blisters in the center (repeated until the correct location is confirmed). And it is carried out during the chastity period, where the influence of the tide is less, and two divers take turns performing the work for an hour. The GPS 42 installed on the top is managed so that it is not submerged in water.

Then, the coordinate values of the GPS 42 are checked, and the identifier 50 is displayed at the location where the mud mat 10 is to be installed. 9 is a plan view illustrating a state in which the identifier 50 is displayed at four points outside the installation location of the mud mat 10 according to an embodiment of the present invention.

As shown in FIG. 9, it can be seen that the diver displays four points outside the mud mat 10 installation location using a reinforcing bar or an identifiable device (identifier 50). When the 4 point mark is completed, connect the 4 points using a connecting wire (51, 5mm)). And after connecting the connection wire 51, check the actual distance (indicate the 1M interval on the wire).

And, by using the crane 32 of the jack-up pants 30, each of the mud mats 10 shipped to the sea-transport pants 20 are installed at each indicated position. 10A is a plan view illustrating a state in which mud mats No. 1 and 2 are installed according to an embodiment of the present invention. And Figure 10b shows a side view of a state in which the 1st and 2nd mud mats 10 are installed according to an embodiment of the present invention.

As shown in FIGS. 10A and 10B, it can be seen that the produced mud mats 10 No. 1 and 2 are lifted and installed using a 750-ton C/Crane 32 of jack-up pants. When the mud mat (10) is lifted from the pants for sea transportation (20) to the installation site, the boom rotation is made toward the C/Crane bow.

11A is a plan view showing a state in which mud mats 3 and 4 are installed according to an embodiment of the present invention. And Figure 11b is a side view showing a state in which the mud mats 3 and 4 are installed according to an embodiment of the present invention. As shown in FIGS. 11A and 11B, it can be seen that the produced mud mats 10 3 and 4 are lifted and installed using a 750-ton C/Crane 32 of jack-up pants. When the mud mat (10) is lifted from the pants for sea transportation (20) to the installation site, the boom rotation is made toward the C/Crane bow.

And later, in order to facilitate the dismantling operation of the mud mat 10, a buoy 16 is installed on the mud mat 10. 12 shows a side view of the mud mat 10 in which the buoy 16 for release is installed according to an embodiment of the present invention. After installing the mud mat (10), if the jack-up pants leg (31) is seated on the mud mat (10) and working, the installed mud mat (10) is immersed in the ground and its position cannot be confirmed. By installing a buoy 16 on the wall, it is possible to identify the location during the dismantling work.

12, a shackle 17 is installed on the mud mat 10, the connecting ring 15, and the padeye, and the connecting member 18 is connected between the shackle 17 and the buoy 16. You can see that you will do it.

And when the installation of the mud mat 10 is completed, the jack-up pants leg 31 is seated on the guide pants frame 14 of the mud mat 10 and an offshore wind power generation system is constructed.

And after constructing the offshore wind power generation system, after confirming the position of the mud mat 10 through the buoy 16, each of the mud mats 10 is lifted using a jack-up trouser crane 32 with GPS 34 installed. After dismantling, it will be shipped to the pants for sea transportation (20).

13 shows a jack-up pants crane hook 33 in which the GPS 34 is installed according to an embodiment of the present invention. As shown in FIG. 13, it can be seen that a GPS installation sheet 35 and a hook GPS 34 are installed on the crane hook 33 to facilitate positioning when the mud mat 10 is dismantled.

14 is a side view of the mud mat 10 lifting operation using the jack-up pants crane hook 33 in which the GPS 34 is installed according to an embodiment of the present invention. And Figure 15 is a plan view showing a state in which the dismantled mud mat 10 is shipped to the transport trousers 20 according to an embodiment of the present invention.

As shown in Fig. 14, after moving to the installation point using the hook GPS 34 installed on the 750-ton C/Crane hook 33 of the jack-up pants, after checking the coordinate values, the hook 33 is shackled ( It can be seen that it is fixed to 17). And, as shown in Figure 15, after lifting the mud mat 10, it can be seen that the shipping to the pants 20 for sea transportation.

In addition, the above-described apparatus and method are not limitedly applicable to the configuration and method of the above-described embodiments, but all or part of each of the embodiments may be selectively combined so that various modifications may be made to the above-described embodiments. It can also be configured.

1: Offshore superstructure
10: mud mat
11: Lower plate
12: first direction reinforcement
13: Second direction reinforcement
14: guide pants frame
15: link
16: buoy
17: shackle
18: connection member
20: pants for sea transportation
30: Jack-up pants
31: Leg
32: crane
33: hook
34: GPS for the hook
35: GPS installation sheet
40: GPS frame body for checking coordinates
41: pipe
42: GPS
43: lifting rug
44: weight
45: horizontal blister
50: identifier
51: connection wire

Claims (5)

In the ground support method of jack-up pants for constructing an offshore wind power system,
A first step of manufacturing a mud mat in a factory having a grid shape and on which jack-up pants legs are footed;
A second step of loading the produced mud mats to the pants for sea transportation, and moving them to the side of the marine superstructure together with the jack-up pants;
A third step of positioning the jack-up pants to be spaced apart from the offshore superstructure at a specific interval, and confirming and displaying a position to install the mud mat in the area between the jack-up pants and the offshore superstructure;
A fourth step of installing each of the mud mats shipped to the sea transport trousers at each marked position using a crane of the jack-up trousers;
A fifth step of mounting each of the jack-up pants legs on each of the mud mats and constructing an offshore wind power generation system; a method for supporting jack-up pants using a mud mat, comprising: a.
The method of claim 1,
Between the fourth step and the fifth step,
Installing a buoy for dismantling the mud mat on the mud mat; Jack-up pants support method using a mud mat further comprising.
The method of claim 2,
After the fifth step,
After constructing the offshore wind power generation system, after confirming the location of the mud mat through the buoy, lifting each of the mud mats using the jack-up pants crane installed with GPS, dismantling, and then shipping them to the barge for marine transportation. Jack-up pants support method using a mud mat comprising the step.
The method of claim 3,
In the first step,
The mud mat is provided on a lower plate, a first direction reinforcement material disposed on the lower plate at a specific distance from each other, a second direction reinforcement material perpendicular to the first direction and disposed at a specific distance from each other, and on the lower plate And jack-up pants support method using a mud mat, characterized in that it comprises a guide pants frame on which the jack-up pants leg is seated, and a connection ring for fixing the jack-up pants crane hook when the buoy is installed and dismantled.
The method of claim 4,
In the third step,
A GPS frame body for checking coordinates having a GPS provided on the top of the pipe to check the coordinates in the jack-up pants, a weight provided at the bottom of the pipe, and a horizontal blister for checking the horizontality of the pipe is provided with the jack-up pants and A method of supporting jack-up pants using a mud mat, characterized in that it is installed in an area between the marine superstructures, checks the GPS coordinate value, and displays an identifier at a location where the mud mat is to be installed.

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