CN112112186B - Installation method of split jacket foundation on offshore converter station - Google Patents
Installation method of split jacket foundation on offshore converter station Download PDFInfo
- Publication number
- CN112112186B CN112112186B CN202011032112.7A CN202011032112A CN112112186B CN 112112186 B CN112112186 B CN 112112186B CN 202011032112 A CN202011032112 A CN 202011032112A CN 112112186 B CN112112186 B CN 112112186B
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- jacket
- piece
- temporary
- installation
- foundation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
Abstract
The invention discloses an installation method of a split jacket foundation on an offshore converter station, which comprises the steps of dividing the jacket foundation into a jacket A piece and a jacket B piece, prefabricating a plurality of corbels on the jacket B piece, installing a plurality of temporary platforms in advance in a sea area where the jacket B piece is installed, and installing the jacket A piece by taking the temporary platforms as measurement base points; calculating to obtain the theoretical installation position of the jacket B sheet by taking the jacket A sheet as a measurement base point; hoisting the jacket B piece to the temporary platform position, enabling the brackets on the jacket B piece to be correspondingly placed on the temporary platform respectively, and measuring the relative position between the jacket A piece and the jacket B piece by taking the jacket A piece as a measurement base point; and fixing the bracket with the corresponding temporary platform respectively, installing a jacket B sheet, and after the installation is finished, removing the bracket and the temporary platform to finish the installation work of the jacket foundation. The invention ensures that the relative position precision can meet the design requirement on the premise of independently installing the two jacket foundations.
Description
Technical Field
The invention relates to a foundation construction technology of offshore wind field large-scale equipment, in particular to an installation method of a split jacket foundation on an offshore converter station.
Background
The offshore converter station is necessary equipment for the offshore wind power plant to develop to a certain stage, and no practical case exists in the construction and installation of the large-scale offshore converter station. The offshore converter station is generally divided into an upper main structure and a lower jacket infrastructure, and the lower jacket is used as the infrastructure of the offshore converter station and needs to be positioned in advance and installed at sea. Because the upper main structure of the offshore converter station has the weight close to or more than 2 ten thousand tons and the external dimension is large, a method of floating and supporting installation of a large semi-submersible ship is generally adopted. In order to simultaneously meet the requirements of supporting the weight of an upper main structure and the requirements of floating and supporting installation of a semi-submersible ship, a jacket foundation of a conventional offshore converter station is designed into a U-shaped structure (see attached drawing 1), namely the upper half part is divided into two pieces and is in butt joint with the upper main structure of the offshore converter station, a neutral space is reserved between the two pieces for the semi-submersible ship to enter and exit and the floating and supporting installation operation, the lower half part is connected into a whole, and the relative position size of each supporting point of the jacket foundation is ensured through rigid connection.
The jacket foundation is divided into two completely independent pieces to be installed at sea, and is currently applied to jacket projects in the field of shallow water oil and gas fields, while in the field of large offshore converter stations, only one example is currently available all over the world. However, the jacket related to all the cases is small in size, the relative distance is usually about 48m, and the mounting method adopts a method that the two jackets are rigidly connected by the temporary steel structure framework and then the two jackets and the temporary framework are integrally hoisted, so that the relative positions of the two jackets are accurate. However, the cost and difficulty of the temporary frame attachment method increase dramatically after the relative positions of the two jackets are larger than 50m and the size of the jackets is increased.
Disclosure of Invention
Aiming at the defect that the application range is small in the prior art, the invention aims to provide the installation method of the split jacket foundation on the offshore converter station, namely the offshore installation land-based construction method, so that the two jacket foundations can be independently installed at any relative distance (especially more than 50 meters), the relative position precision can meet the design requirement, the construction period can be shortened, and the construction cost and the construction technical difficulty can be reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for installing a split jacket foundation on an offshore converter station comprises the steps of dividing the jacket foundation into a jacket A piece and a jacket B piece, prefabricating a plurality of corbels on the jacket B piece, installing a plurality of temporary platforms in advance in a sea area where the jacket B piece is installed, and then installing the jacket A piece by taking the temporary platforms as measurement base points;
calculating to obtain the theoretical mounting position of the jacket B sheet by taking the jacket A sheet as a measurement base point;
hoisting the jacket B piece to the temporary platform position, so that the corbels on the jacket B piece are respectively and correspondingly placed on the temporary platform, and measuring the relative position between the jacket A piece and the jacket B piece by taking the jacket A piece as a measurement base point;
and fixing the bracket with the corresponding temporary platform respectively, installing the jacket B sheet, and after the installation is finished, removing the bracket and the temporary platform to finish the installation work of the jacket foundation.
Preferably, the installation method specifically includes the following steps:
1) prefabricating a plurality of brackets on the jacket B sheet;
2) installing a plurality of temporary platforms in advance at the position, corresponding to the bracket, of the sea area where the jacket B piece is installed;
3) mounting the jacket A sheet by taking the temporary platform as a measurement base point;
4) calculating the theoretical installation position of the jacket B piece by taking the jacket A piece as a measurement base point, and positioning and installing a positioning guide device on the temporary platform according to the theoretical installation position;
5) hoisting and placing the jacket B piece on the temporary platform;
6) taking the jacket A piece as a measurement base point, measuring the relative position between the jacket A piece and the jacket B piece, adjusting the gap or the position of the installation positioning guide device, finely adjusting the position of the jacket B piece, and fixing the corbels with the corresponding temporary platforms respectively after the installation requirements are met;
7) piling and grouting the jacket B piece;
8) after the B piece of the jacket is installed, the bracket and the temporary platform are removed;
9) and finishing the installation work of the jacket foundation.
Preferably, the brackets are prefabricated with four.
Preferably, the temporary platform is provided with four, corresponding to four angular positions of the jacket B-piece.
Preferably, in the step 7), during the pile driving and grouting work of the B piece of the jacket, the relevant data is measured in real time and adjusted according to the requirement.
The installation method of the split jacket foundation on the offshore converter station, provided by the invention, has the advantages that:
1) the total weight of the temporary platform used in the present invention is only five to six hundred tons, and considering that the distance between the jackets is 50m, the temporary platform used in the conventional method has a weight at least close to 3000 tons. Therefore, even if the construction cost of the temporary platform at sea is added, the total cost of the invention is lower;
2) if the temporary frame is connected according to a conventional method, then the two jacket bodies are integrally hoisted, and at least two large floating crane devices are needed; if the relative spacing of the jackets exceeds 50 meters (i.e., the relative spacing of the temporary frames exceeds 50 meters), the difficulty and risk of hoisting will increase dramatically. In the invention, the two jackets and the temporary platform can be independently constructed, and only conventional construction equipment such as a floating crane is adopted, so that the risk level and the equipment cost can be greatly reduced;
3) when the split jacket is large in size, heavy in weight and far in relative position, the split jacket provides a brand-new solution on the premise that the relative position of the split jacket meets centimeter-level requirements during offshore installation.
Drawings
FIG. 1 is a schematic diagram of a conventional U-shaped jacket construction and a float-over installation method;
FIG. 2 is a schematic flow diagram of the installation method of the present invention;
FIG. 3 is a schematic view of the relative positioning of the A and B pieces of the jacket during the installation method of the present invention;
FIG. 4 is a schematic illustration of the relative positioning of the B piece of the jacket to the temporary platform in the installation method of the present invention;
FIG. 5 is a schematic illustration of the relative positioning of the corbels and temporary platforms on the B piece of the jacket of the installation method of the present invention;
FIG. 6 is a schematic view of a positioning guide on the temporary platform in the installation method of the present invention;
fig. 7 is a schematic top view of fig. 5.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 2 to 6, in the method for installing a split jacket foundation on an offshore converter station according to the present invention, the jacket foundation is divided into a jacket a piece 1 and a jacket B piece 2, and four brackets 4 are prefabricated on the jacket B piece 2. During offshore construction, four temporary platforms 3 are installed in the sea area in advance according to design positions at four corner positions for installing the jacket B pieces 2, then the jacket A pieces 1 are installed by using a large-scale floating crane by taking the temporary platforms 3 as measurement base points, and the work of piling, grouting and the like is completed.
After the jacket A sheet 1 is installed, the actual theoretical installation position of the jacket B sheet 2 is obtained through calculation by taking the jacket A sheet 1 as a measurement base point, and a positioning guide device 5 is installed on the temporary platform 3 according to the theoretical installation position.
Hoisting the jacket B sheet 2 to a position above the temporary platform 3 by using a large floating crane, correspondingly placing four corbels 4 on the jacket B sheet 2 on the four temporary platforms 3 respectively, measuring the relative position between the jacket A sheet 1 and the jacket B sheet 2 by using the jacket A sheet 1 as a measurement base point, adjusting the gap or position of the positioning guide device 5, and finely adjusting the position of the jacket B sheet 2 by using the large floating crane.
After the design requirements are met, the brackets 4 are respectively fixed with the corresponding temporary platforms 3, then piling, grouting and other work of the jacket B pieces 2 are carried out, relevant data are measured in real time in the process, and adjustment is carried out according to requirements.
And after the jacket B sheet 2 is installed, cutting off the bracket 2 and detaching the temporary platform 3 to complete the installation work of the jacket foundation.
The installation method specifically comprises the following steps:
1) four brackets 4 are prefabricated on the jacket B sheet 2;
2) four temporary platforms 3 are installed in advance according to the design at four angular positions for installing the jacket B piece 2;
3) mounting a jacket A sheet 1 by using a large-scale floating crane by taking the temporary platform 3 as a measurement base point;
4) calculating the actual theoretical installation position of the jacket B sheet 2 by taking the jacket A sheet 1 as a measurement base point, and positioning and installing a positioning guide device 5 on the temporary platform 3 according to the theoretical installation position;
5) hoisting and placing the jacket B sheets 2 on the four temporary platforms 3 by using a large-scale floating crane;
6) taking the jacket A sheet 1 as a measurement base point, measuring the relative position between the jacket A sheet 1 and the jacket B sheet 2, adjusting the gap or position of the installation positioning guide device 5, finely adjusting the position of the jacket B sheet 2 by using a large floating crane, and temporarily fixing the corbels 4 with the corresponding temporary platforms 3 respectively after the installation requirements are met;
7) pile driving, grouting and the like are carried out on the jacket B piece 2;
8) after the jacket B sheet 2 is installed, cutting off the bracket 4 and dismantling the temporary platform 3;
9) and finishing the installation work of the jacket foundation.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (4)
1. A method for installing a split jacket foundation on an offshore converter station is characterized by comprising the following steps: the method comprises the following steps:
dividing a jacket foundation into a jacket A piece and a jacket B piece, prefabricating a plurality of corbels on the jacket B piece, mounting a plurality of temporary platforms in advance in a sea area where the jacket B piece is mounted, and mounting the jacket A piece by taking the temporary platforms as a measurement base point;
calculating to obtain a theoretical installation position of the jacket B piece by taking the jacket A piece as a measurement base point, and positioning and installing a positioning guide device on the temporary platform according to the theoretical installation position;
hoisting the jacket B piece to the temporary platform position, so that the corbels on the jacket B piece are respectively and correspondingly placed on the temporary platform, measuring the relative position between the jacket A piece and the jacket B piece by taking the jacket A piece as a measurement base point, adjusting the gap or the position of the installation positioning guide device, and finely adjusting the position of the jacket B piece;
after the installation requirement is met, the bracket is fixed with the temporary platform corresponding to the bracket respectively, the jacket B piece is installed again, the jacket B piece is subjected to piling and grouting, after the installation is completed, the bracket and the temporary platform are removed, and the installation work of the jacket foundation is completed.
2. The method of installing a split jacket foundation on an offshore converter station according to claim 1, wherein: four brackets are prefabricated.
3. The method of installing a split jacket foundation on an offshore converter station according to claim 2, wherein: the temporary platforms are provided with four, corresponding to four angular positions of the jacket sheet B respectively.
4. The method of installing a split jacket foundation on an offshore converter station according to claim 1, wherein: and measuring relevant data in real time in the working process of piling and grouting of the jacket B piece, and adjusting according to requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011032112.7A CN112112186B (en) | 2020-09-27 | 2020-09-27 | Installation method of split jacket foundation on offshore converter station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011032112.7A CN112112186B (en) | 2020-09-27 | 2020-09-27 | Installation method of split jacket foundation on offshore converter station |
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| CN112112186A CN112112186A (en) | 2020-12-22 |
| CN112112186B true CN112112186B (en) | 2022-02-22 |
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| CN202011032112.7A Active CN112112186B (en) | 2020-09-27 | 2020-09-27 | Installation method of split jacket foundation on offshore converter station |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112726548B (en) * | 2021-02-04 | 2022-09-16 | 中交第三航务工程局有限公司 | Construction method for split jacket foundation of deep-open sea converter station |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2546418A1 (en) * | 2011-07-11 | 2013-01-16 | GeoSea NV | Method for providing a foundation for a mass located at height, and a positioning frame for performing the method |
| CN107326887A (en) * | 2017-06-22 | 2017-11-07 | 广东华尔辰海上风电工程有限责任公司 | Offshore wind farm elder generation pile leader frame construction method of installation |
| CN209178967U (en) * | 2018-09-21 | 2019-07-30 | 中国电建集团华东勘测设计研究院有限公司 | The split type jacket structure of Large marine platform of support method installation is floated suitable for shallow sea water |
| CN209568463U (en) * | 2019-01-31 | 2019-11-01 | 中交一航局第二工程有限公司 | Combined type offshore wind power foundation and its assembling, installation system |
| CN211257052U (en) * | 2019-10-22 | 2020-08-14 | 浙江大学 | Pile-first method offshore wind power jacket foundation hoisting underwater auxiliary positioning device |
-
2020
- 2020-09-27 CN CN202011032112.7A patent/CN112112186B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2546418A1 (en) * | 2011-07-11 | 2013-01-16 | GeoSea NV | Method for providing a foundation for a mass located at height, and a positioning frame for performing the method |
| CN107326887A (en) * | 2017-06-22 | 2017-11-07 | 广东华尔辰海上风电工程有限责任公司 | Offshore wind farm elder generation pile leader frame construction method of installation |
| CN209178967U (en) * | 2018-09-21 | 2019-07-30 | 中国电建集团华东勘测设计研究院有限公司 | The split type jacket structure of Large marine platform of support method installation is floated suitable for shallow sea water |
| CN209568463U (en) * | 2019-01-31 | 2019-11-01 | 中交一航局第二工程有限公司 | Combined type offshore wind power foundation and its assembling, installation system |
| CN211257052U (en) * | 2019-10-22 | 2020-08-14 | 浙江大学 | Pile-first method offshore wind power jacket foundation hoisting underwater auxiliary positioning device |
Non-Patent Citations (1)
| Title |
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| 海上风电换流站海上施工技术;刘卫东等;《船舶工程》;20200731;第612-614、619页 * |
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