CN106628018B - Self-propelled large-scale component transportation and installation integrated ship and construction process - Google Patents
Self-propelled large-scale component transportation and installation integrated ship and construction process Download PDFInfo
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- CN106628018B CN106628018B CN201611024417.7A CN201611024417A CN106628018B CN 106628018 B CN106628018 B CN 106628018B CN 201611024417 A CN201611024417 A CN 201611024417A CN 106628018 B CN106628018 B CN 106628018B
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- 238000009434 installation Methods 0.000 title claims abstract description 56
- 238000010276 construction Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008569 process Effects 0.000 title claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 230000032258 transport Effects 0.000 claims description 9
- 238000009417 prefabrication Methods 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/003—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for for transporting very large loads, e.g. offshore structure modules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
- B63B27/08—Arrangement of ship-based loading or unloading equipment for cargo or passengers of winches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B2241/00—Design characteristics
- B63B2241/20—Designs or arrangements for particular purposes not otherwise provided for in this class
- B63B2241/24—Designs or arrangements for particular purposes not otherwise provided for in this class for facilitating transport, e.g. hull shape with limited dimensions
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Abstract
The invention provides a self-propelled large-scale component transporting and installing integrated ship and a construction process, and belongs to the technical field of large-scale component underwater installation construction. The self-propelled large-scale component transportation and installation integrated ship comprises a catamaran straddling above a large-scale component and an installation device; the catamaran comprises a first hull and a second hull which are arranged in parallel, the upper part of the first hull is connected with the upper part of the second hull through a deck bridge, and the tail ends of the first hull and the second hull are respectively provided with a propeller; the mounting device comprises a winch and a cable lifting mechanism which are arranged on the deck bridge, and a lifting hook which is positioned below the deck bridge, wherein the winch, the cable lifting mechanism and the lifting hook are sequentially connected through a cable; the mounting device further comprises a buttress for supporting the large-scale member, and the buttress is arranged at the bottom of the deck bridge. By adopting the self-propelled large-scale component transportation and installation integrated ship and the construction process provided by the invention, channel traffic can be relieved, additional installation equipment is not required, and the construction process is simple.
Description
Technical Field
The invention belongs to the technical field of large-scale component underwater installation and construction, and particularly relates to a self-propelled large-scale component transportation and installation integrated ship and a construction process.
Background
At present, the large-scale components prefabricated in a prefabrication plant are usually transported to the position above an installation foundation trough in a floating mode, and then mooring, sinking and installation of the large-scale components are carried out. However, in the prior art, the floating transportation of large-scale components usually requires a large number of tugs to assist transportation, and the tugs occupy a large number of channels, which leads to channel congestion and is not favorable for transportation; moreover, when the large-scale component is installed, large-scale component installation equipment needs to be additionally erected on the sea, and the large-scale component needs to be installed after being taken off the ship, so that the construction process is complex and the channel is occupied. Therefore, how to relieve the channel traffic and simplify the underwater installation construction process of the large-scale component is a technical problem which is urgently needed to be solved at present.
Disclosure of Invention
Aiming at the technical problems of crowded channel and complex construction process in underwater installation and construction of the large-scale component, the invention provides the self-propelled large-scale component transportation and installation integrated ship and the construction process, which can transport the large-scale component by self-propulsion, relieve channel traffic, complete sinking and installation of the large-scale component, do not need additional equipment and simplify the construction process.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a self-propelled large-scale component transportation and installation integrated ship, which comprises a catamaran straddling above a large-scale component and an installation device for connecting and sinking the large-scale component; the catamaran comprises a first hull and a second hull which are arranged in parallel, the upper part of the first hull is connected with the upper part of the second hull through a deck bridge, and the tail ends of the first hull and the second hull are respectively provided with a propeller for providing sailing power; the mounting device comprises a winch and a cable lifting mechanism which are arranged on the deck bridge in a matched manner, and a lifting hook positioned below the deck bridge, wherein the winch, the cable lifting mechanism and the lifting hook are sequentially connected through a cable; the mounting device further comprises a buttress for supporting the large member, and the buttress is arranged at the bottom of the deck bridge.
Preferably, the head ends and the tail ends of the first ship body and the second ship body are respectively provided with a side thruster for assisting the ship body to turn in place.
Preferably, a dynamic positioning system is arranged on the catamaran.
Preferably, a first horizontal limiting device is arranged on the lower portion of the first hull and on the side of the ship opposite to the second hull, and a second horizontal limiting device corresponding to the first horizontal limiting device is arranged on the lower portion of the second hull and on the side of the ship opposite to the first hull.
Preferably, the buttress is arranged in an inverted cone shape.
Preferably, the number of the buttresses is multiple, and the multiple buttresses are uniformly distributed at the bottom of the deck bridge.
Preferably, the number of the winch, the cable lifting mechanism and the lifting hook which are arranged in a matched manner is multiple.
Preferably, a measuring tower is arranged on the catamaran, and a GPS is arranged at the upper part of the measuring tower.
The invention also provides a construction process for realizing the transportation and installation of the large-scale component by utilizing the self-propelled large-scale component transportation and installation integrated ship in any technical scheme, which comprises the following steps:
fitting-out: the self-propelled large-scale component transportation and installation integrated ship straddles above the prefabricated large-scale component, and the large-scale component is connected and fixed below the self-propelled large-scale component transportation and installation integrated ship through a lifting hook;
large-scale component transportation: the self-propelled large-scale component transportation and installation integrated ship transports the large-scale component from a prefabrication factory to a newly dug channel in a self-propelled manner, and a warning ship is equipped in the whole journey; after entering a newly-excavated channel, a tugboat is equipped for auxiliary transportation, and then the large-scale component is transported to the upper part of the foundation trench by turning in a turning area;
installation of large-scale components: the method comprises the steps of mooring a self-propelled large-scale component transportation and installation integrated ship with a cable, accurately positioning a sinking position in a twisting mode, and placing the large-scale component into a foundation trench through a winch and a cable lifting mechanism to complete large-scale component installation.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the self-propelled large-scale component transportation and installation integrated ship provided by the invention can transport large-scale components to the upper part of the installation foundation trench by self-propulsion through the arranged propeller without the assistance of a large number of tugboats, can relieve water traffic, and ensures smooth channel and safe construction;
2. the self-propelled large-scale component transporting and installing integrated ship provided by the invention can not only complete the transportation of large-scale components, but also complete the sinking installation of the large-scale components through the carried installation equipment, does not need to additionally erect the installation equipment, has simple construction process and does not occupy a channel;
3. when the self-propelled large-scale component transportation and installation integrated ship and the construction process provided by the invention are adopted to carry out underwater installation of large-scale components, a new construction plant is not needed, and only the existing prefabricated plant dock gate is required to be modified and widened, so that a large amount of cost can be saved.
Drawings
FIG. 1 is a schematic top view of a self-propelled large-scale component transport and installation structure of a ship according to an embodiment of the present invention;
FIG. 2 is a left side view of a self-propelled large component transport and installation structure of a ship according to an embodiment of the present invention;
FIG. 3 is a schematic bottom view of a self-propelled large component transport and installation structure of a ship according to an embodiment of the present invention;
in the above figures: 1. a first hull; 2. a second hull; 3. a deck bridge; 4. a propeller; 5. a side pusher; 6. a winch; 7. a cable lifting mechanism; 8. a cable; 9. a measuring tower; 10. a large component; 11. a hook; 12. buttress; 13. a first horizontal limiting device; 14. and a second horizontal limiting device.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the positional relationships shown in fig. 2 only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example (b):
as shown in fig. 1, in one aspect, the embodiment of the present invention provides a self-propelled large component transport and installation integrated ship, which includes a catamaran straddling a large component 10 and an installation device for connecting and sinking the large component 10; the catamaran comprises a first hull 1 and a second hull 2 which are arranged in parallel, the upper part of the first hull 1 is connected with the upper part of the second hull 2 through a deck bridge 3, and the tail ends of the first hull 1 and the second hull 2 are respectively provided with a propeller 4 for providing sailing power. As shown in fig. 2, the mounting device comprises a winch 6 and a cable lifting mechanism 7 which are arranged on the deck bridge 3 in a matching way, and a hook 11 which is positioned below the deck bridge 3, wherein the winch 6, the cable lifting mechanism 7 and the hook 11 are sequentially connected through a cable 8; the installation device further comprises a buttress 12 for supporting the large member 10, the buttress 12 being arranged at the bottom of the deck bridge 3.
In the present embodiment, the distance between the first hull 1 and the second hull 2 is greater than the width of the large member 10, and when the large member 10 is transported, the first hull 1 and the second hull 2 are respectively located on both sides of the large member 10, and the deck bridge 3 is located above the large member 10, so that the catamaran straddles above the large member 10. The ship is provided with sailing power through the arranged propeller 4, large-scale components 10 are transported to the upper portion of the installation foundation trench in a self-sailing mode, a large number of tug boats are not needed for assistance, water traffic can be relieved, and smooth navigation channel and construction safety are guaranteed. When the large member 10 is transported, the large member 10 is hooked by the hook 11, the cable 8 is tightened by the winch 6, the hook 11 is lifted by the cable lifting mechanism 7, the large member 10 is supported by the buttress 12, and the large member 10 is connected and fixed below the deck bridge 3; when the large member 10 is installed, the cable 8 is loosened by the winch 6, and then the hook 11 is lowered by the cable lifting mechanism 7, so that the large member 10 is sunk in the foundation trench. Therefore, the self-propelled large-scale component transporting and installing integrated ship provided by the embodiment of the invention can not only complete the transportation of large-scale components, but also complete the sinking and installation of large-scale components through the carried installation equipment, does not need to additionally erect installation equipment, has a simple construction process and does not occupy a channel.
In order to facilitate the turning of the ship body and reduce the turning radius, as shown in fig. 1, the head end and the tail end of the first ship body 1 and the second ship body 2 are respectively provided with a side thruster 5 for assisting the ship body to turn in place. The side thruster 5 can provide side thrust for the ship body, realizes pivot steering at a small rotation angle, reduces the steering radius and does not occupy a channel. In addition, the side thrust provided by the side thruster 5 can balance the yaw moment applied by the wind waves and keep the heading.
Further, in order to facilitate accurate positioning of the large member 10 when it is submerged, a dynamic positioning system is provided on the catamaran. The dynamic positioning system is arranged to control the acting force of the propeller 4 and the side thruster 5 on the ship body to resist the wind and the waves, so that the ship body is kept at the required position, and the positioning of the large component 10 is more accurate when the large component is sunk. In addition, the positioning of the dynamic positioning system cannot be increased along with the increase of the water depth, and the dynamic positioning system is convenient to operate and low in cost.
In order to avoid collision and friction between the large component 10 and the hulls during transportation, as shown in fig. 2, a first horizontal limiting device 13 is provided on the lower portion of the first hull 1 on the side of the ship opposite to the second hull 2, and a second horizontal limiting device 14 corresponding to the first horizontal limiting device 13 is provided on the lower portion of the second hull 2 on the side of the ship opposite to the first hull 1. Through the arrangement of the first horizontal limiting device 13 and the second horizontal limiting device 14, the large component 10 is limited between the first horizontal limiting device 13 and the second horizontal limiting device 14, collision and friction between the large component 10 and the first ship body 1 and the second ship body 2 are avoided, damage to the large component 10 and the ship bodies is reduced, and meanwhile, navigation safety is guaranteed.
Preferably, the pier 12 is provided with an inverted cone shape. Because the buttress 12 of back taper structure is more firm, make buttress 12 can better play the supporting role. The number of the piers 12 may be plural, as shown in fig. 3, the number of the piers 12 is exemplarily 8, and the 8 piers 12 are uniformly distributed at the bottom of the deck bridge 3 to maintain the deck bridge 3 and the large member 10 in a balanced force.
In order to reduce the stress of the cable and ensure the safety of transportation and construction, the number of the winch 6, the cable lifting mechanism 7 and the lifting hook 11 which are arranged in a matching way can be multiple, as shown in fig. 1 and fig. 3, the number of the winch 6, the cable lifting mechanism 7 and the lifting hook 11 which are arranged in a matching way is 4, and 4 lifting hooks 11 are uniformly distributed below the deck bridge 3 so as to maintain the stress balance of the cable 8 and the large member 10 and ensure the safety of transportation and construction.
In order to measure the plane position and elevation of the large-scale component 10 after being submerged in water, a measuring tower 9 is further arranged on the catamaran, and a GPS is arranged at the upper part of the measuring tower 9. When the large member 10 is submerged, the plane position and the elevation of the large member 10 are measured and recorded in real time through the measuring tower 9 and the GPS arranged at the upper part of the measuring tower, so that the large member 10 can be accurately positioned and installed.
In another aspect of the embodiments of the present invention, a construction process for transporting and installing a large component by using the self-propelled large component transporting and installing integrated ship according to the above embodiments is further provided, including the following steps:
fitting-out: the self-propelled large-scale component transportation and installation integrated ship straddles above the prefabricated large-scale component 10, and the large-scale component 10 is connected and fixed below the self-propelled large-scale component transportation and installation integrated ship through the lifting hook 11. In this step, the specific steps of connecting and fixing the large member 10 are as follows: the large member 10 is hooked by the hook 11, the cable 8 is tightened by the winch 6, the hook 11 is lifted by the cable lifting mechanism 7, and the large member 10 is supported by the buttress 12, so that the large member 10 is connected and fixed below the deck bridge 3. In addition, the large component 10 may be restricted between the first and second horizontal stoppers 13 and 14 by the provision of the first and second horizontal stoppers 13 and 14.
Large-scale component transportation: the self-propelled large component transportation and installation integrated ship transports the large component 10 from a prefabrication factory to a newly dug channel in a self-propelled manner, and a warning ship is arranged in the whole journey; after entering a newly dug channel, a tugboat is equipped for auxiliary transportation, and then the large-scale component 10 is transported to the position above the foundation trench by turning in a turning area. In this step, it should be noted that, because the cross flow action of the newly dug channel is strong, the equipped tug wheels resist the cross flow action, and the specific equipped number of tug wheels can be determined by calculation according to the measured cross flow action force. In addition, when the large component 10 is transported to the position above the foundation trench, the dynamic positioning system for transporting and installing the self-propelled large component on the integrated ship can keep the ship body at the required position by controlling the acting force of the propellers 4 and the side thrusters 5 on the ship body, so that the positioning of the large component 10 when the large component is sunk is more accurate.
Installation of large-scale components: and mooring the self-propelled large-scale component transportation and installation integrated ship with a cable, accurately positioning a sinking position in a twisting mode, and putting the large-scale component 10 into a foundation trench through a winch 6 and a cable lifting mechanism 7 to finish the installation of the large-scale component 10. In this step, the specific steps of sinking the large component 10 are as follows: the cable 8 is loosened by the winch 6, and then the hook 11 is lowered by the cable lifting mechanism 7 to sink the large-sized member 10 into the foundation trench. During the sinking process of the large component 10, the plane position and the elevation of the large component 10 can be measured and recorded in real time through the measuring tower 9 and the GPS arranged at the upper part of the measuring tower.
After the large-scale component 10 is installed and meets the requirements through penetration measurement, the self-propelled large-scale component transporting and installing integrated ship can return to a prefabricating factory to wait for the transporting and installing tasks of the next large-scale component.
Claims (4)
1. The construction process for transporting and installing the large-scale components is characterized in that a self-propelled large-scale component transporting and installing integrated ship is used for transporting and installing;
the self-propelled large component transportation and installation integrated ship comprises a catamaran straddling the large components and an installation device for connecting and sinking the large components; the catamaran comprises a first hull and a second hull which are arranged in parallel, the upper part of the first hull is connected with the upper part of the second hull through a deck bridge, and the tail ends of the first hull and the second hull are respectively provided with a propeller for providing sailing power; the mounting device comprises a winch and a cable lifting mechanism which are arranged on the deck bridge in a matched manner, and a lifting hook positioned below the deck bridge, wherein the winch, the cable lifting mechanism and the lifting hook are sequentially connected through a cable; the mounting device also comprises a buttress for supporting the large member, and the buttress is arranged at the bottom of the deck bridge; the head ends and the tail ends of the first ship body and the second ship body are respectively provided with a side thruster for assisting the ship body to turn in situ; a dynamic positioning system is arranged on the catamaran; a first horizontal limiting device is arranged on the lower portion of the first ship body and on the ship side opposite to the second ship body, and a second horizontal limiting device corresponding to the first horizontal limiting device is arranged on the lower portion of the second ship body and on the ship side opposite to the first ship body; a measuring tower is arranged on the twin-hull ship, and a GPS is arranged at the upper part of the measuring tower;
the construction process comprises the following steps:
fitting-out: the self-propelled large-scale component transportation and installation integrated ship straddles above the prefabricated large-scale component, and the large-scale component is connected and fixed below the self-propelled large-scale component transportation and installation integrated ship through a lifting hook; the method comprises the following specific steps of connecting and fixing the large-scale member: the large component is hung by the hook, the cable is tightened by the winch, the hook is lifted by the cable lifting mechanism, the large component is supported by the buttress, the large component is connected and fixed below the deck bridge, and the large component is limited between the first horizontal limiting device and the second horizontal limiting device by the first horizontal limiting device and the second horizontal limiting device;
large-scale component transportation: the self-propelled large-scale component transportation and installation integrated ship transports the large-scale component from a prefabrication factory to a newly dug channel in a self-propelled manner, and a warning ship is equipped in the whole journey; after entering a newly-excavated channel, a tugboat is equipped for auxiliary transportation, and then the large-scale component is transported to the upper part of the foundation trench by turning in a turning area; when the large-scale component is transported to the position above the foundation trench, the dynamic positioning system resists the acting force of wind and waves on the ship body by controlling the propeller and the side thruster;
installation of large-scale components: mooring the self-propelled large-scale component in a mooring way, accurately positioning a sinking position in a twisting and moving way, and putting the large-scale component into a foundation trench through a winch and a cable lifting mechanism to finish the installation of the large-scale component; the method comprises the following specific steps of: loosening the cable through the winch, and then lowering the lifting hook through the cable lifting mechanism to sink the large member into a foundation trench; and in the sinking process of the large member, measuring and recording the plane position and the elevation of the large member in real time through the measuring tower and a GPS arranged at the upper part of the measuring tower.
2. The construction process for transporting and installing the large-scale component according to claim 1, wherein: the buttress is arranged into an inverted cone.
3. The construction process for transporting and installing the large-scale component according to claim 2, wherein: the quantity of buttress is a plurality of, and is a plurality of buttress evenly distributed in deck bridge bottom.
4. The construction process for transporting and installing the large-scale component according to claim 1, wherein: the number of the winch, the cable lifting mechanism and the lifting hook which are arranged in a matched manner is multiple.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611024417.7A CN106628018B (en) | 2016-11-17 | 2016-11-17 | Self-propelled large-scale component transportation and installation integrated ship and construction process |
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| CN201611024417.7A CN106628018B (en) | 2016-11-17 | 2016-11-17 | Self-propelled large-scale component transportation and installation integrated ship and construction process |
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| CN106628018A CN106628018A (en) | 2017-05-10 |
| CN106628018B true CN106628018B (en) | 2021-03-23 |
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Cited By (1)
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| EP4098541A4 (en) * | 2021-04-23 | 2023-08-16 | CCCC First Harbor Engineering Co., Ltd. | Semi-submersible-type immersed tube transportation and mounting integrated ship and construction process |
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| CN110877666A (en) * | 2019-05-05 | 2020-03-13 | 中交第一航务工程局有限公司 | Self-propelled underwater tunnel immersed tube carrying and mounting integrated ship and construction process |
| CN107651120B (en) * | 2017-08-16 | 2023-08-08 | 中交第一航务工程局有限公司 | Ship pipe connecting device and connecting method |
| CN108419666A (en) * | 2018-02-13 | 2018-08-21 | 大连海洋大学 | Ocean deepwater platform raft fixation is sticked together with cement and launches facility and method |
| CN109533209A (en) * | 2018-12-24 | 2019-03-29 | 中交航局第二工程有限公司 | Large-scale component lifting transport installation integrated ship and construction technology |
| CN110284504A (en) * | 2019-06-27 | 2019-09-27 | 中国铁建港航局集团有限公司 | A kind of underwater prefabricated components mounting platform and method |
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| CN2615042Y (en) * | 2003-04-25 | 2004-05-12 | 中铁大桥局集团有限公司 | Special crane ship for transporting & erecting bridges on sea |
| CN2701748Y (en) * | 2003-09-30 | 2005-05-25 | 陈泽 | Waterborne construction craft |
| CN102514690B (en) * | 2012-01-09 | 2014-04-16 | 广东华尔辰海上风电工程有限责任公司 | Multifunctional twin-hull wind power engineering ship for offshore high-altitude heavy-duty lifting installation operation |
| CN102530189A (en) * | 2012-03-08 | 2012-07-04 | 中国海洋石油总公司 | Catamaran for ocean engineering |
| KR101262806B1 (en) * | 2012-03-09 | 2013-05-09 | 임용호 | The corrugate pipe auto supplying apparatus for installation underground |
| CN102642601B (en) * | 2012-04-28 | 2014-09-10 | 上海利策科技股份有限公司 | Movable full-rotation type hoisting catamaran |
| KR20140051531A (en) * | 2012-10-23 | 2014-05-02 | 건국대학교 산학협력단 | Structure of offshore structure, manufacturing and constructing method thereof |
| CN103912013B (en) * | 2013-01-07 | 2016-03-30 | 中交一航局第二工程有限公司 | The immersion method of tunnel immersed tube |
| CN103507938A (en) * | 2013-09-12 | 2014-01-15 | 南通明德重工有限公司 | Power positioning system of platform supply ship |
| CN105293306A (en) * | 2015-11-04 | 2016-02-03 | 华南理工大学 | Integral offshore wind turbine hoisting device achieving multi-freedom-degree compensation |
| CN205475326U (en) * | 2016-03-04 | 2016-08-17 | 中铁隧道集团二处有限公司 | A frock that is arranged in immersed tube tunnel tube coupling transportation by driving |
| CN206141776U (en) * | 2016-11-17 | 2017-05-03 | 中交第一航务工程局有限公司 | Large -scale component transportation of self -navigation formula installs integrative ship |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4098541A4 (en) * | 2021-04-23 | 2023-08-16 | CCCC First Harbor Engineering Co., Ltd. | Semi-submersible-type immersed tube transportation and mounting integrated ship and construction process |
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