TW201938453A - Offshore work facility and method of manufacturing same - Google Patents

Abstract

The present invention provides an offshore work facility which is capable of stable operation even in deep water and can improve work efficiency. The offshore work facility has three pillars 10, a deck 20 supported so as to be capable of being raised and lowered with respect to the pillars 10, and a crane 30 installed on the deck 20. The deck 20 is configured as a floating body structure, and has a main deck section 21, and a first protruding section 22 formed so as to protrude from the main deck section 21. The crane 30 is installed on the first protruding section 22. The offshore work facility is constructed by adding the first protruding section 22 and the crane 30 to a jack-up drilling rig with the drilling equipment and cantilever removed. The first protruding section 22 is added to the main deck section 22 using the support structure of the cantilever.

Description

Offshore operation equipment and manufacturing method thereof

The invention relates to an offshore operation equipment and a manufacturing method thereof which can be used for the construction of offshore equipment such as offshore wind power generation equipment.

From the perspective of effective use of natural energy, offshore wind power has attracted attention.

The construction of offshore wind power equipment mostly uses offshore operating equipment called self-elevating platform (SEP). A self-elevating platform usually has a plurality of foot posts and a platform supported by the foot posts in an arbitrary lifting manner (Patent Document 1, Patent Document 2). The platform is equipped with a working crane, which is used to assemble offshore wind power equipment. In addition, the platform can also be used as a space for loading and unloading various components of offshore wind power equipment.
[Learning technical literature]
[Patent Literature]

Patent Document 1: Japanese Patent Application Publication No. 2015-37925 Patent Document 2: Japanese Patent Application Publication No. 2016-215937

[Questions to be solved by the invention]

In recent years, as offshore wind power generation equipment, for example, offshore wind power generation equipment with a large output of more than 6MW has been developed, so that the size of the offshore wind power generation equipment itself has become correspondingly larger, and not only the implantation type, but also the floating body type equipment has been developed. And practical. As mentioned above, platforms for offshore operation equipment are equipped with cranes for operation or used as loading and unloading spaces for various parts. Therefore, for the construction of large-scale offshore wind power equipment, offshore operation equipment with a larger platform is required. In addition, for the construction of floating wind power equipment, offshore operation equipment that can operate stably even in sea areas where the water depth exceeds 90m is required.

To perform offshore construction in waters with a depth of more than 90m, if the existing jack-up platform is not available, a large floating crane is usually used, but it is susceptible to waves and easily causes standby time and operation efficiency. reduce. On the other hand, offshore operation equipment with large platforms will result in a slower towing speed from the bay to the offshore equipment construction site, that is, the sea area. The decrease in towing speed is the reason for the extension of the offshore equipment construction period.

Therefore, one of the objectives of the present invention is to provide an offshore operation equipment, which can stably operate in deep sea waters, and can improve the operation efficiency and its manufacturing method.
[Technical means to solve the problem]

The offshore working equipment of the present invention has:
3 or more foot posts;
The platform is composed of a floating structure and is supported in such a way that it can be raised and lowered relative to the foot column; and a crane mounted on the platform;
The platform has: a main platform portion configured with the leg post, and a protruding portion formed by protruding from the main platform portion;
The offshore operation equipment is formed by attaching the protruding portion and the crane to an existing lifting drilling device having the main platform portion and the leg column;
The protruding portion is a cantilever supporting structure for the on-board excavation equipment carried by the existing lifting drilling device, and is attached to the main platform portion;
The crane is mounted on the protruding portion.

The manufacturing method of the offshore operation equipment of the present invention includes:
A lifting drilling device is prepared, comprising: three or more leg columns; a main platform portion configured with the leg columns and supported in a manner capable of being lifted relative to the leg columns; a cantilever supported by the main platform portion through the support structure; Configured mining equipment;
Removing the cantilever and the excavation equipment from the lifting drilling device;
A protruding portion formed by protruding from the main platform portion is added to the main platform portion using the supporting structure; and a crane is mounted on the protruding portion.
[Effect of Invention]

According to the present invention, an offshore operation equipment can be provided, which can also operate stably and effectively in deep sea waters. Moreover, according to the manufacturing method of the offshore work equipment of this invention, the said offshore work equipment can be manufactured in a short time and at low cost.

1 to FIG. 3, an offshore working equipment 1 according to an embodiment of the present invention is shown. The offshore operation equipment 1 includes a foot post 10, a platform 20 supported by the foot post 10, and a crane 30 mounted on the platform 20. The offshore operation equipment 1 can be used for the construction of offshore equipment such as offshore wind power equipment. The platform 20 is composed of a floating structure. When the offshore equipment 1 is used for the construction of offshore equipment, the offshore equipment 1 is a tug boat such as a tugboat and is towed to the offshore equipment construction site. Sea area.

The foot post 10 supports the platform 20 above the sea level during the offshore operation performed by the offshore operation equipment 1. Therefore, the length of the foot post 10 can support the platform 20 above the sea level in a state where the lower end portion touches the sea floor. The offshore work equipment 1 includes three or more leg posts 10 in order to stably support the platform 20. The structure of the foot post 10 is not limited as long as the foot post 10 can achieve the above-mentioned functions. For example, a known structure such as a self-elevating platform used in offshore operation equipment 1 or a foot post used in an elevating drilling device may be adopted . Although the length of the foot post 10 is not particularly limited, it is desirable that the foot post 10 bottom out without being affected by waves, and the construction can be performed stably even when the construction is in a sea area exceeding 90 m in length. In addition, the cross-sectional shape of the leg post 10 is not particularly limited, and may be any shape such as a circle or a polygon.

The platform 20 is supported by a lifting mechanism (not shown) in a manner of being arbitrarily raised and lowered relative to the leg post 10. As the lifting mechanism, any mechanism such as a rack and pinion mechanism can be used. When the offshore operation equipment 1 is towed, the lifting mechanism is moved to raise the foot post 10 relative to the platform 20 so that the foot post 10 does not touch the bottom. The platform 20 is composed of a floating structure, so raising the foot post 10 will cause the offshore working equipment 1 to float on the sea level, and the offshore working equipment 1 can be towed in this state.

The platform 20 includes a top wall 20a, a bottom wall 20b, and an outer peripheral wall 20c, whereby the platform 20 is configured as a floating body structure having a closed internal space. As shown in FIG. 2A, the internal space of the platform 20 is divided into a plurality of partitions by a strength member, that is, at least one partition wall 20d, thereby ensuring sufficient mechanical strength, which is sufficient to use the upper surface of the platform 20 as working space and construction offshore. Use of space for component mounting.

As shown in FIG. 2, the platform 20 includes a main platform portion 21, a first protruding portion 22, and a second protruding portion 23. In the form shown, the platform 20 has two first protrusions 22 and two second protrusions 23, but the number of the first protrusions 22 and the number of the second protrusions 23 are not limited. Among the main platform portion 21, the first protruding portion 22, and the second protruding portion 23, the main platform portion 21 is a portion having the largest area when viewed from above, and the leg post 10 is disposed at an outer edge portion of the main platform portion 21. Therefore, most of the upper surface of the main platform portion 21 can be used as a working space and a space for mounting components for constructing offshore equipment. In the case where the offshore equipment is an offshore wind power generation equipment, it is preferable that the platform 20 has a space in which parts of one offshore wind power generation equipment can be mounted, for example. The plan shape of the main platform portion 21 is not limited.

The first protruding portion 22 may have a shape such that, when viewed from above, it faces the connecting side of two adjacent leg posts 10 and protrudes in a convex shape from the main platform portion 21. The upper surface of the first protruding portion 22 is preferably on the same plane as the upper surface of the main platform portion 21. Therefore, the working space and the space for mounting parts on the upper surface of the platform 20 can be practically enlarged.

A crane 30 is mounted on the first protruding portion 22. The crane 30 may be a fixed type or a crawler type. However, since most of the work is performed without moving on the first protruding portion 22, a fixed crane 30 is actually sufficient. In addition, compared with a crawler crane, the fixed crane 30 occupies a smaller area on the platform 20 and can secure a larger space on the platform 20, which is advantageous from this point of view.

The first protruding portion 22 is equipped with a crane 30 so that the crane 30 is located outside the area surrounded by all the leg columns 10 (three leg columns 10 in this embodiment) supporting the platform 20.

In this way, the crane 30 is mounted on the first protrusion 22 outside the area surrounded by the leg 20, and as shown in FIG. 2, the working range θ1 of the crane 30 (with the center of rotation O of the crane 30 as the center) Rotation range) to extend beyond 180 °. In contrast, as shown in FIG. 3, when the crane 30 is mounted on the main platform portion 21, the leg pillars 10 are usually arranged at the corners of the main platform portion 21, so the crane 30 is positioned on the two leg pillars 10. The enclosed area. Therefore, the working range θ2 of the crane 30 is set to less than 180 °. The operation range of the crane 30 is expanded, which can further improve the operation freedom of the crane 30.

In addition, as long as the entire system of the platform 20 is composed of a floating body structure, the first protrusion 22 itself may be constituted by a floating body structure, or may not be constituted by a floating body structure. When the first protruding portion 22 is formed of a floating structure, the first protruding portion 22 may have a top wall, a bottom wall, and an outer peripheral wall that form an internal space in the first protruding portion 22 in the same manner as the main platform 21. The first protruding portion 22 may further have a partition wall as required.

The second protruding portion 23 is formed to protrude from the main platform 21 from a position different from the first protruding portion 22 so as not to exceed the width of the main platform portion 21. The second protruding portion 23 may have a shape similar to that of the first protruding portion 21, and when viewed from above, faces the connecting side of two adjacent leg posts 10, and protrudes from the main platform portion 21 in a convex shape. The second protruding portion 23 is configured by a floating structure. Therefore, like the main platform 21, the second protruding portion 23 may have a top wall, a bottom wall, and an outer peripheral wall that form an internal space in the second protruding portion 23. The second protruding portion 23 may further have a partition wall as required.

A second protruding portion 23 is added to the main platform portion 21 to further expand the space on the platform 20, and at the same time, the stability during towing of the offshore working equipment 1 can be improved. In addition, since the shape of the second protruding portion 23 does not exceed the width of the main platform portion 21, it is possible to prevent the resistance from increasing during towing. Therefore, avoiding the decrease in tow speed, the tow offshore operation equipment 1 can be effectively towed. In order to avoid the resistance during towing, when the offshore working equipment 1 is towed in the direction of the white arrow shown in FIG. 2A, the second protruding portion 23 preferably adopts this shape: the main platform portion 21 and the second platform The combined shape of the protrusions 23 is a boat shape whose width is expanded from the bow side to the stern side.

The case where the platform 20 has a single-layer structure has been described above, but the platform 20 may have a multi-layer structure. Figure 4 shows a schematic side view of an offshore work equipment having a multi-layered platform. In the following description of the offshore work equipment shown in FIG. 4, the same reference numerals as those in FIG. 1 and the like are assigned to the same configuration as the offshore work equipment described previously, and the description is omitted.

In the offshore work equipment 1 shown in FIG. 4, the platform 20 includes a second top wall 120 a disposed above the top wall 20 a and separated from the top wall 20 a, and a second top wall 120 a separated from the top wall 20 a. The second outer peripheral wall 120c and the second partition wall (not shown) that are supported in a spaced manner make the platform 20 a two-layer structure. The top wall 20a, the second top wall 120a, the second outer peripheral wall 120c, and the second partition wall are arranged above the top wall 20a. The structure is a floating structure formed by an internal space divided into a plurality of partitions. Made up. Therefore, even if structures such as the second top wall 120a, the second outer peripheral wall 120c, and the second partition wall are added to the top wall 20a, the platform 20 ensures the necessary buoyancy and is sufficient to tow offshore work equipment.

The second top wall 120a and the second outer peripheral wall 120c may be arranged at least with the main platform among the main platform portion 21 (see FIG. 2), the first protruding portion 22 (see FIG. 2), and the second protruding portion (see FIG. 2). The position corresponding to the part 21. That is, it is not necessary to make the entire platform 20 a two-layer structure. However, in order to effectively use the upper surface of the platform 20, it is preferable to arrange the second top wall 120a and the second outer peripheral wall 120c so that all areas of the main platform portion 21, the first protruding portion 22, and the second protruding portion 23 have a two-layer structure. .

By making the platform 20 a two-layer structure like this, the mechanical strength of the platform 20 can be improved, and the platform 20 can carry heavier items. As a result, when the parts are transported from the construction terminal for offshore equipment construction to the construction site, that is, the sea area, the offshore operation equipment can be utilized for the transportation of more or heavier parts. Although the case where the platform 20 has a two-layer structure has been described here, the platform 20 may be configured with three or more layers.

Next, a construction method of the offshore equipment to which the offshore operation equipment 1 of this form is applied will be described with an example where the offshore equipment is an offshore wind power generation equipment.

First, various parts such as the windmill components of the offshore wind power generation equipment and the offshore operation equipment 1 are moved from the construction dock for construction to the construction site, that is, the sea area. The movement of the offshore work equipment 1 is performed by raising the feet 10 relative to the platform 20 and towing the offshore work equipment 1 with the towing vessel while the platform 20 is floating at sea level. At this time, parts of the offshore wind power generation equipment are mounted on the platform 20. As long as the platform 20 has a space capable of carrying one component of the offshore wind power generation equipment and has mechanical strength, the movement of the components of the offshore wind power generation equipment does not require a ship for parts transportation.

After the parts of the offshore wind power generation equipment and the offshore operation equipment 1 are moved, the foot post 10 of the offshore operation equipment 1 is lowered relative to the platform 20 so that the foot post 10 touches the sea floor. At this time, as shown in FIG. 1, the foot post 10 is lowered until the platform 20 is located above the sea level. Therefore, offshore wind power equipment can be constructed without being affected by walrus conditions.

After the foot post 10 touches the sea floor, the parts on the platform 20 are suspended by the crane 30, and the offshore wind power generation equipment is assembled by the crane 30. The crane 30 is mounted on the first protruding portion 22, and the working range of the crane 30 is further expanded, so that it can be smoothly assembled.

After the assembly of the offshore wind power generation equipment, the foot post 10 is raised relative to the platform 20 again, and the offshore operation equipment 1 is returned to the construction pier by the towing vessel.

It is also possible to connect a plurality of offshore operation equipments 1 and use them as construction docks for offshore equipment construction for loading and unloading or assembling parts of offshore equipment. FIG. 5 shows a top view of a construction pier using a plurality of offshore working equipment 1. FIG.

The construction pier shown in FIG. 5 is connected with three offshore operation equipments 1, and the components of the offshore equipment can be loaded and unloaded or assembled on the platform 20. Since the crane 30 is mounted on the first protrusion 22, a wider platform space can be secured. In addition, the offshore working equipment 1 is arranged so that the cranes 30 are located at different positions, and even if the plurality of cranes 30 are operating simultaneously, they will not interfere with each other.

Construction pier can be set up in each project. The offshore operation equipment 1 is used as a construction pier. Therefore, after the terminal operation is completed, the offshore operation equipment 1 can be directly moved to the offshore construction sea area to construct the offshore equipment. Construction pier can be used as permanent equipment. In this way, the offshore working equipment 1 can be used as a construction terminal, thereby replacing the harbor equipment for the offshore equipment, and the construction terminal can be installed at a low cost and in a short period of time.

In the foregoing, the present invention has been described by way of example. The offshore operation equipment 1 to which the present invention belongs has a main platform portion 21 and a foot column 10, and to the existing offshore operation equipment such as a jack-up platform or a lifting drilling device, a first protrusion 21 and a crane 30 are added, or It is necessary to add the second protruding portion 23 in this way, and it can be configured as such. “Existing offshore operation equipment” means that it has the function of serving as the purpose of the offshore operation equipment, and the already existing offshore operation equipment, the offshore operation equipment 1 in this form, may Reconstruction of operating equipment.

Generally, existing offshore operating equipment such as jack-up platforms and elevating drilling equipment has: elevating foot posts, and platforms that can be lifted and supported relative to the foot posts (equivalent to the offshore form of this form described above) The main platform portion 21) of the work equipment 1).

Therefore, the existing offshore operation equipment is used (reconstructed) to constitute the offshore operation equipment to which the present invention belongs, whereby the foot posts and platforms of the structure of the existing offshore operation equipment can be used to constitute the foot posts 10 and the main platform part 21, respectively. . Therefore, offshore operation equipment can be obtained more simply and in a short period of time. As a result, the cost of offshore operation equipment can be reduced significantly. In particular, by using the existing lifting drilling device to constitute the offshore operation equipment 1, it is possible to obtain an offshore operation equipment more simply and in a short period of time. Even when offshore construction is performed in a sea depth exceeding 90m, the foot column can be touched. The bottom is not affected by waves, and construction is stable.

In addition, the lifting drilling device has on-board excavation equipment, which can perform oil or natural gas excavation in the state of bottoming offshore. The ship's excavation equipment is mounted on a cantilever set on the platform. However, the cantilever is moved on the platform by the driving mechanism, and excavation is performed at a position protruding from the platform. In order to support such a load of the entire cantilever including the driving mechanism and the excavation equipment on the ship, the platform holds a strength member such as a partition wall having a necessary strength inside as a supporting structure.

This embodiment focuses on this point, and uses the cantilever support structure of the conventional elevating drilling equipment when constructing the first protruding portion 22. That is, the first protruding portion 22 is supported by the cantilever support structure, and the autonomous platform portion 21 protrudes. Here, "cantilever support structure" refers to the support structure having a platform described above to support the load of the entire cantilever including the driving mechanism and the on-board excavation equipment, and specifically, a strength member having the necessary strength to support the entire cantilever. Such as dividing walls. In this way, the original supporting structure of the jack-up drilling device is used, so the first protruding portion 22 has a sufficient mechanical strength to carry a crane 30 having a weight structure such as a casing of an offshore wind power generation equipment, and the system does not need to be re-built. The additional strength member can be added more easily with the original strength member. As a result, the cost of achieving offshore operating equipment is significantly reduced.

In addition, when the first protruding portion 22 is formed by using the cantilever supporting structure of the lifting drilling device as described above, the cantilever and the ship's excavation equipment of the lifting drilling device are removed, and the first protruding portion 22 is formed on the cantilever supporting structure. , On which a crane 30 is mounted. Therefore, the offshore work equipment 1 no longer functions as an excavation device.

In addition, in the case where the platform 20 has a multilayer structure in order to improve the mechanical strength of the platform 20, a ceiling wall having a higher mechanical strength than the existing ceiling wall is generally replaced. However, generally, various structures such as electric wires and water supply and drainage pipes are mounted under the top wall. Therefore, even when the top wall is replaced, these structures must be replaced together. Therefore, as shown in FIG. 4, the top wall 20a is retained, and the second top wall 120a is disposed above it, so that the existing electric wires and water supply and drainage pipes can be utilized. As a result, the construction period of the offshore operation equipment 1 can be shortened, and Avoid rising construction costs.

1‧‧‧ offshore equipment

10‧‧‧ Post

20‧‧‧ platform

20a‧‧‧Top wall

20b‧‧‧ bottom wall

20c‧‧‧outer wall

20d‧‧‧partition wall

21‧‧‧Main Platform Department

22‧‧‧ 1st protrusion

23‧‧‧ 2nd protrusion

30‧‧‧ Crane

120a‧‧‧ 2nd top wall

120c‧‧‧The second outer wall

FIG. 1 is a schematic side view of an offshore working facility according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of the offshore working equipment shown in FIG. 1. FIG.

FIG. 2A shows the internal structure of the platform in the offshore operation equipment shown in FIG. 2.

FIG. 3 illustrates the working range of the crane when the crane is arranged in the area surrounded by the foot column.

FIG. 4 is a schematic side view of an offshore working equipment in another form of the present invention in which the platform has a multilayer structure.

FIG. 5 illustrates an example of the use form of the offshore work equipment shown in FIG. 1.

Claims (7)

An offshore operation equipment having: 3 or more foot posts; The platform is constructed of a floating structure and is supported in such a way that it can be raised and lowered relative to the foot post; and Crane, mounted on the platform; The platform has: a main platform portion configured with the leg post, and a protruding portion formed by protruding from the main platform portion; The offshore operation equipment is formed by attaching the protruding portion and the crane to an existing lifting drilling device having the main platform portion and the leg column; The protruding portion is a cantilever supporting structure for onboard excavation equipment carried by the existing lifting drilling device, and the cantilever supporting structure is attached to the main platform portion; The crane is mounted on the protruding portion. If you apply for offshore operation equipment under the scope of patent application No. 1, This platform further has a second protrusion formed by a floating structure. If you apply for offshore operation equipment in the scope of patent application item 2, The second protruding portion is formed to protrude from the main platform in a shape that does not exceed the width of the main platform portion. If you apply for offshore operation equipment in the scope of patent application No. 2 or 3, among them, The second protruding portion is formed to protrude from the protruding portion and has a shape described later. The shape of the combination of the second protruding portion and the main platform portion is a boat shape whose width extends from the bow side to the stern side. If you apply for offshore operation equipment in any one of the scope of patents 1 to 3, The platform has a top wall, a bottom wall, an outer peripheral wall and a partition wall; an internal space is formed on the platform by the top wall, the bottom wall and the peripheral wall; the internal space is divided into a plurality of partitions by the partition wall. If you apply for offshore operation equipment under the scope of patent application item 5, It further includes a second top wall disposed above the top wall, and a second outer peripheral wall and a second partition wall that support the second top wall at a distance from the top wall. A manufacturing method for offshore operation equipment includes: A lifting drilling device is prepared. The lifting drilling device includes: three or more leg columns; a main platform portion on which the leg columns are arranged and supported in a manner capable of being lifted relative to the leg columns; and a main platform portion supported by a supporting structure. The cantilever supported by the Ministry and the excavation equipment arranged on the cantilever; Remove the cantilever and the excavation equipment from the lifting drilling device; A protruding portion formed by protruding from the main platform portion is added to the main platform portion using the support structure; and A crane is mounted on the protruding portion.