CN113356214A - Grouting bottom sealing method for offshore wind turbine jacket foundation structure - Google Patents
Grouting bottom sealing method for offshore wind turbine jacket foundation structure Download PDFInfo
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- CN113356214A CN113356214A CN202110624421.1A CN202110624421A CN113356214A CN 113356214 A CN113356214 A CN 113356214A CN 202110624421 A CN202110624421 A CN 202110624421A CN 113356214 A CN113356214 A CN 113356214A
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- bottom sealing
- grouting
- steel pipe
- steel plate
- jacket
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- 238000007789 sealing Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 75
- 239000010959 steel Substances 0.000 claims abstract description 75
- 239000000463 material Substances 0.000 claims abstract description 33
- 238000010276 construction Methods 0.000 claims abstract description 19
- 238000003466 welding Methods 0.000 claims abstract description 16
- 239000004746 geotextile Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000011440 grout Substances 0.000 claims description 11
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
-
- 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
-
- 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
- E02D27/52—Submerged foundations, i.e. submerged in open water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Foundations (AREA)
- Wind Motors (AREA)
Abstract
A grouting and bottom sealing method for a foundation structure of a jacket of an offshore wind turbine comprises the following steps of performing bottom sealing operation on the jacket of the wind turbine by using a circular bottom sealing steel plate, a stiffening plate, geotextile, a sealing cover, a low-strength grouting material and a high-performance grouting material: welding the bottom sealing steel plate and the stiffening plate into the steel pipe pile, then performing pile planting operation on the steel pipe pile, then inserting the fan jacket into the steel pipe pile, and finally performing the pouring operation of the low-strength grouting material and the high-performance grouting material in sequence. According to the method, the bottom sealing steel plate is arranged inside the steel pipe pile, so that the construction precision requirement is lowered, the problem of loose grouting and plugging is solved, the construction cost is saved, and the method has important significance in improving the efficiency of offshore wind power jacket foundation construction and saving the cost.
Description
Technical Field
The invention relates to the technical field of offshore wind turbine installation, in particular to a grouting and bottom sealing method for an offshore wind turbine jacket foundation structure.
Background
At present, fan structures have various structural forms, are suitable for different water depth conditions, the jacket structure is more economical and reasonable at the water depth of about 35m, the jacket structure and a foundation are generally connected in a grouting mode, the principle is that high-strength grouting materials are poured into annular gaps between jacket inserting legs and steel pipe piles, which have different diameters, and the load of the upper fan jacket structure is transmitted to the foundation pile by using the adhesive force between the grouting materials and the steel pipe wall and a shear key welded on the steel pipe wall in advance; according to the construction sequence of the jacket structure and the steel pipe piles, the jacket foundation structure can be divided into a pile-first method and a pile-second method, wherein the pile-first method is to drive the steel pipe piles into a preset position and then insert the inserting tips of the jacket legs into the steel pipe piles so as to fix the upper jacket structure; then, the pile method jacket is to place the jacket on the seabed in advance, and to use the hollow space of the leg part of the jacket to drive the steel pipe pile and then to fill and seal; grouting material generally has fast hard early strength, high elastic modulus, characteristics such as superhigh strength, owing to need accomplish the grout under water, grouting material all has fabulous mobility, consequently need set up the back cover device at grout section bottom fixed position and carry out the grout and seal.
For a jacket foundation adopting a pile-first method, the existing design generally adopts a process of continuously arranging two layers of rubber sealing rings on the insertion tips of jacket legs for grouting and plugging, but the process has higher requirements on the relative positions and verticality of the jacket legs and rock-socketed piles, and in actual construction operation, due to the influence of sudden wind and surge on the sea, the problem of shaking of a ship body or a lifting hook can exist when the jacket is hoisted; therefore, the relative position of the jacket leg inserted into the steel pipe pile and the perpendicularity of the jacket leg are difficult to control, so that a gap may exist between a sealing ring on the jacket inserting tip and the inner wall of the steel pipe pile, and the plugging failure is caused; meanwhile, friction and collision between the jacket insert legs and the inner wall of the steel pipe pile in the hoisting process can cause damage to the rubber sealing ring, so that grouting plugging is not tight; the failure of grout shutoff can lead to in the grout leaks into the steel-pipe pile, because the steel-pipe pile gets into the seabed darker, the lower part clearance is very big, if fill up whole space with the grout, can cause a large amount of wastes of grouting material to, sealing washer cost itself is also comparatively high, and the cost is higher.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a grouting bottom sealing method for a jacket foundation structure of an offshore wind turbine, which can reduce the requirement on construction precision, avoid the problem of loose grouting and plugging and save the construction cost.
The technical problem to be solved by the present invention is achieved by the following technical means. The invention relates to a grouting and bottom sealing method for a jacket foundation structure of an offshore wind turbine, which uses a bottom sealing steel plate, a stiffening plate, geotextile, a sealing cover, a low-strength grouting material and a high-performance grouting material for bottom sealing operation and comprises the following specific steps:
(1) firstly, opening a hole in the middle of a bottom sealing steel plate, welding a section of round steel pipe in the hole to be used as a water inlet hole, and then welding the bottom sealing steel plate and a stiffening plate into the steel pipe pile for rock embedding;
(2) carrying out pile planting operation of the steel pipe pile, and opening a water inlet hole in the pile planting process to allow water to enter the upper part of the bottom sealing steel plate;
(3) plugging the water inlet, covering geotextile outside the water inlet, and then covering a sealing cover to seal the water inlet;
(4) inserting the fan guide pipe frame leg into the steel pipe pile, and then grouting in a space between the fan guide pipe frame insertion tip and the bottom sealing steel plate, wherein grouting material with lower strength is adopted for grouting;
(5) and after the low-strength grouting material is filled, pouring a high-performance grouting material into the space between the steel pipe pile and the fan guide pipe frame leg until the grout overflows outwards, and finishing grouting construction.
The technical problem to be solved by the invention can be further realized by the following technical scheme that in the step (1) of the offshore wind turbine jacket foundation structure grouting bottom sealing method, the welding method of the bottom sealing steel plate and the stiffening plate comprises the steps of welding the stiffening plate to the inside of the steel pipe pile, and then welding the bottom sealing steel plate to the stiffening plate.
The technical problem to be solved by the invention can be further realized by the following technical scheme that for the grouting bottom sealing method for the offshore wind turbine jacket foundation structure, the welding position of the bottom sealing steel plate is 20 cm lower than the inserting tip elevation of the jacket.
The technical problem to be solved by the invention can be further realized by the following technical scheme that in the method for sealing the bottom of the offshore wind turbine jacket foundation structure by grouting, in the step (1), two ends of a circular steel pipe protrude outwards from the opening on the bottom-sealing steel plate, and the protruding length is 3-5 cm.
Compared with the prior art, the invention has the advantages that:
1. the invention can effectively avoid the slurry leakage phenomenon caused by the untight fit of the sealing ring and the inner wall of the steel pipe pile due to the accumulated errors of the implanted steel pipe pile and the jacket inserting point in the jacket inserting leg construction, thereby effectively controlling the grouting tightness and avoiding the slurry leakage accident;
2. the invention directly reduces the use of two rings of rubber sealing rings, can directly save the manufacturing cost of the sealing rings, and the added bottom sealing steel plate and the matched components have low price, thereby saving a large amount of construction cost;
3. the space below the grouting material is directly filled with a low-strength grouting material (pipe lubricating material), so that the grouting process is not increased, and the treatment time caused by the sealing failure of the rubber sealing ring can be avoided.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the method for sealing the bottom of the foundation structure of the jacket of the offshore wind turbine by grouting comprises the following steps of:
(1) in order to prevent the excessive buoyancy of water in the planted pile caused by the round bottom-sealed steel plate 5, a hole is formed in the middle of the bottom-sealed steel plate 5, a section of round steel pipe 7 is welded in the hole, and the upper part and the lower part of the round steel pipe are respectively exposed to the height of 3-5cm and used as water inlet holes;
then welding a bottom sealing steel plate 5 inside a steel pipe 7 pile 1 for rock embedding, wherein the position is 20 cm lower than the elevation of a jacket inserting tip 4, in order to bear the self weight of grouting material without deformation during grouting, welding a stiffening plate 6 in the steel pipe 7 pile 1 below the bottom sealing steel plate 5, and the stiffening plate 6 is a support plate consisting of a channel steel or angle steel in a shape like a Chinese character jing; the concrete welding method is that firstly, the stiffening plate 6 is welded in the steel pipe 7 pile 1, and then the bottom sealing steel plate 5 is welded on the stiffening plate 6;
(2) then, carrying out pile planting operation on the steel pipe 7 pile 1, and opening a water inlet hole in the pile planting process to allow water to enter the upper part of the bottom sealing steel plate 5, so that pile planting construction is facilitated;
(3) in order to plug the water inlet, a diver enters the steel pipe 7 pile 1 before grouting, and the water inlet is sealed in a mode of covering the outer side of the water inlet with geotextile and covering a sealing cover 8;
(4) inserting a fan guide pipe frame leg 2 into a steel pipe 7 pile 1, sleeving a stop 3 matched with the steel pipe 7 pile 1 on the fan guide pipe frame leg 2 for limiting the fan guide pipe frame leg 2, and filling a space at the lower part of a grouting connection section of the fan guide pipe frame leg 2, namely a space between a circular bottom sealing steel plate 5 and the original sealing ring position, with a grouting material (such as a pipe moistening material) with lower strength; in the original grouting construction process, a proper pipe moistening material is needed to be injected before grouting for a wet grouting device; in the grouting bottom sealing method process, only a proper amount of pipe wetting materials are needed to be poured to fill the bottom space;
(5) after the filling with the low-strength grouting material such as the pipe lubricating material is basically finished, the high-performance grouting material is poured until the space in the original grouting connecting section is filled, the grout overflowing hole begins to overflow grout outwards, and the grouting construction is finished.
This application is offshore wind turbine jacket pile method foundation structure grouting back cover method earlier, through placing back cover steel sheet 5 in the inside of steel pipe 7 piles 1, has reduced the construction accuracy requirement, has stopped the not tight problem of grout shutoff, has practiced thrift construction cost simultaneously, and efficiency promotion and cost saving to offshore wind turbine jacket foundation construction have the significance.
The invention has the advantages that:
1. the invention can effectively avoid the slurry leakage phenomenon caused by the untight fit of the sealing ring and the inner wall of the steel pipe pile due to the accumulated errors of the implanted steel pipe pile and the jacket inserting point in the jacket inserting leg construction, thereby effectively controlling the grouting tightness and avoiding the slurry leakage accident;
2. the invention directly reduces the use of two rings of rubber sealing rings, can directly save the manufacturing cost of the sealing rings, and the added bottom sealing steel plate and the matched components have low price, thereby saving a large amount of construction cost;
3. the space below the grouting material is directly filled with a low-strength grouting material (pipe lubricating material), so that the grouting process is not increased, and the treatment time caused by the sealing failure of the rubber sealing ring can be avoided.
Claims (4)
1. A grouting bottom sealing method for a jacket foundation structure of an offshore wind turbine is characterized by comprising the following steps: the method uses a bottom sealing steel plate, a stiffening plate, geotextile, a sealing cover, a low-strength grouting material and a high-performance grouting material for bottom sealing operation, and comprises the following specific steps:
(1) firstly, opening a hole in the middle of a bottom sealing steel plate, welding a section of round steel pipe in the hole to be used as a water inlet hole, and then welding the bottom sealing steel plate and a stiffening plate into the steel pipe pile for rock embedding;
(2) carrying out pile planting operation of the steel pipe pile, and opening a water inlet hole in the pile planting process to allow water to enter the upper part of the bottom sealing steel plate;
(3) plugging the water inlet, covering geotextile outside the water inlet, and then covering a sealing cover to seal the water inlet;
(4) inserting the fan guide pipe frame leg into the steel pipe pile, and then grouting in a space between the fan guide pipe frame insertion tip and the bottom sealing steel plate, wherein grouting material with lower strength is adopted for grouting;
(5) and after the low-strength grouting material is filled, pouring a high-performance grouting material into the space between the steel pipe pile and the fan guide pipe frame leg until the grout overflows outwards, and finishing grouting construction.
2. The offshore wind turbine jacket foundation structure grouting and bottom sealing method according to claim 1, characterized in that: in the step (1), the welding method of the bottom sealing steel plate and the stiffening plate comprises the steps of welding the stiffening plate to the inside of the steel pipe pile, and then welding the bottom sealing steel plate to the stiffening plate.
3. The offshore wind turbine jacket foundation structure grouting and bottoming method according to claim 1 or 2, characterized in that: the welding position of the bottom sealing steel plate is 20 cm lower than the inserting tip elevation of the jacket.
4. The offshore wind turbine jacket foundation structure grouting and bottom sealing method according to claim 1, characterized in that: in the step (1), both ends of the round steel pipe protrude outwards from the opening on the bottom sealing steel plate, and the protruding length is 3-5 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110624421.1A CN113356214A (en) | 2021-06-04 | 2021-06-04 | Grouting bottom sealing method for offshore wind turbine jacket foundation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110624421.1A CN113356214A (en) | 2021-06-04 | 2021-06-04 | Grouting bottom sealing method for offshore wind turbine jacket foundation structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113356214A true CN113356214A (en) | 2021-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110624421.1A Pending CN113356214A (en) | 2021-06-04 | 2021-06-04 | Grouting bottom sealing method for offshore wind turbine jacket foundation structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855867A (en) * | 2022-05-19 | 2022-08-05 | 中国电建集团华东勘测设计研究院有限公司 | Raft gravity type jacket offshore wind turbine foundation and construction method thereof |
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| CN111593728A (en) * | 2020-06-05 | 2020-08-28 | 中交第三航务工程局有限公司 | Embedded rock-socketed pile 'pile-first method' interpolation type jacket foundation construction system |
| CN112647533A (en) * | 2020-12-25 | 2021-04-13 | 中交上海三航科学研究院有限公司 | Construction system and construction method for preventing slurry leakage in jacket foundation pile by pile-first method |
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2021
- 2021-06-04 CN CN202110624421.1A patent/CN113356214A/en active Pending
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| CN104947676A (en) * | 2015-06-29 | 2015-09-30 | 中国能源建设集团广东省电力设计研究院有限公司 | Offshore grouting leakage preventing structure and method |
| CN205046588U (en) * | 2015-09-08 | 2016-02-24 | 广东明阳风电产业集团有限公司 | Marine fan jacket basis grout of shutoff formula under water connection structure |
| CN107268665A (en) * | 2017-07-27 | 2017-10-20 | 浙江华蕴海洋工程技术服务有限公司 | The sealing device and encapsulating method of marine fan jacket foundation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855867A (en) * | 2022-05-19 | 2022-08-05 | 中国电建集团华东勘测设计研究院有限公司 | Raft gravity type jacket offshore wind turbine foundation and construction method thereof |
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Application publication date: 20210907 |