CN113882421A - Offshore wind power generation gravity type foundation and installation method - Google Patents
Offshore wind power generation gravity type foundation and installation method Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 10
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
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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
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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
- E02D27/50—Anchored foundations
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Abstract
The invention relates to the technical field of offshore wind power industry, in particular to an offshore wind power generation gravity type foundation and an installation method thereof. The center on gravity type basis is the center, it advances thick liquid reservation passageway to have seted up a plurality of center pillars that run through in the center pillar, external octagonal box below the center pillar middle part, the octagonal box includes the bottom plate, the box outer wall and the box baffle that separates into the radial lobe of a plurality of with the octagonal box, box baffle one side and center pillar outer wall connection, box baffle opposite side and box outer wall connection leave the space between box baffle bottom and the bottom plate as wearing the water hole, a plurality of inlet valves are installed to the lower part of box outer wall, the bottom on gravity type basis is equipped with basic extension toe. The gravity type foundation and the block stone foundation bed are connected into a whole by using the foundation bed slurry lifting process, and the gaps of the block stone foundation bed are densely filled with cement mortar and act together with the toe protection arrises, so that the stability of the foundation bed is ensured, the sea wave is prevented from being brushed, and no settlement occurs.
Description
Technical Field
The invention relates to the technical field of offshore wind power industry, in particular to an offshore wind power generation gravity type foundation and an installation method thereof.
Background
The gravity type foundation is another main foundation type in the foundation structure of the offshore wind generating set, and the gravity type foundation mainly resists overturning moment and sliding force generated by upper fan load and external environment load by the weight of the foundation and ballast so that the foundation and the fan tower structure are kept stable. The gravity type foundation structure part is usually a reinforced concrete structure, saves steel, has good economic effect, is built in a land prefabrication mode, does not need offshore piling operation, has small workload of offshore field installation, and saves construction time and cost. However, the traditional gravity type foundation has huge volume and self weight, large-scale hoisting equipment is needed for marine transportation and installation, and the construction cost is increased.
Chinese patent [ CN201610403644.4] discloses a bottle-shaped gravity type foundation for offshore wind power, wherein during the installation of the bottom of the gravity type foundation and the cushion layer, the gravity type foundation and the cushion layer are not fixedly connected, which may result in the lower part of the foundation bed sinking under the repeated brushing of sea waves, and easily results in the instability of the overall sedimentation of the fan.
Disclosure of Invention
In order to solve the problem that the gravity type foundation and the rock block foundation bed are not fixedly connected in the installation process of the existing gravity type foundation, so that the lower foundation bed sinks under the repeated sea wave brushing, the invention provides the gravity type foundation for offshore wind power generation and the installation method.
The technical scheme adopted by the invention for realizing the purpose is as follows: the utility model provides a marine wind power generation gravity type basis, gravity type basis's center is the center pillar, set up a plurality of the rising that runs through the center pillar and starching the reservation passageway in, the fan tower section of thick bamboo is connected to the center pillar upper end, the following external octagonal box in center pillar middle part, the octagonal box includes bottom plate, box outer wall and separates the octagonal box into the box baffle of the radial lobe of a plurality of, and box baffle one side and center pillar outer wall connection, box baffle opposite side and box outer wall connection leave the space between box baffle bottom and the bottom plate as wearing the water hole, and a plurality of inlet valves are installed to the lower part of box outer wall, the bottom on gravity type basis is equipped with the basis extension toe, center pillar and octagonal box are integrative prefabricated cast molding.
Furthermore, a flange plate is embedded in the upper end face of the middle upright post, and the middle upright post is connected with the fan tower barrel through the flange plate.
Furthermore, an accessory component is installed on the upper portion of the center pillar, and the accessory component comprises a ship leaning component, a J-shaped pipe, an icebreaking cone and a ladder.
Furthermore, the slurry lifting reserved channel is formed by embedding a grouting steel pipe in the middle upright post.
A method for installing an offshore wind power generation gravity type foundation comprises the following steps:
step 1: prefabricating a gravity type foundation, namely integrally casting and molding a middle upright post, an octagonal box body and a foundation extension toe by utilizing concrete and steel bars, embedding a grouting steel pipe in the middle upright post to form a slurry lifting reserved channel, and embedding a flange plate on the upper end surface of the middle upright post;
step 2: constructing a foundation bed, namely excavating a foundation trench, throwing stones into the foundation trench, tamping the foundation bed and leveling the foundation bed to form a blocky stone foundation bed;
and step 3: installing a gravity type foundation, transporting the gravity type foundation to an installation position, opening a water inlet valve to enable the gravity type foundation to be filled with water and sink, simultaneously utilizing a submersible pump to cooperate with water injection into a bay to level the gravity type foundation until the gravity type foundation is contacted with the bed bottom of the rock foundation, and then filling the gravity type foundation to enable the filling to be filled in the bays of the middle upright column and the octagonal box body;
and 4, step 4: lifting slurry of a foundation bed, erecting a construction platform around a gravity type foundation, installing pore-forming equipment on the construction platform in place according to a slurry lifting reserved channel reserved on a center pillar, carrying out pore-forming on a rock foundation bed at the bottom of the gravity type foundation through the slurry lifting reserved channel by the pore-forming equipment, and then grouting the rock foundation bed and the slurry lifting reserved channel;
and 5: installing toe protecting arris bodies, placing the twisting Chinese character blocks around and above the basic expanded toes, constructing the twisting Chinese character blocks according to a mode of placing from bottom to top and randomly placing at fixed points, wherein when the twisting Chinese character blocks are placed, the twisting Chinese character blocks are mutually close and stable, and checking and leak repairing are carried out after the placement is finished;
step 6: and (4) mounting an accessory component, namely mounting the ship leaning component, the J-shaped pipe, the icebreaking cone and the ladder on the gravity type foundation by using bolts.
Furthermore, in the step 1, the gravity type foundation is prefabricated in a prefabricated field, a movable tower crane is adopted to install steel templates and steel bars, the steel bar engineering is that hoisting steel bar pieces are combined with on-site manual binding, concrete is intensively mixed and supplied by a mixing station, a concrete tank truck is adopted for horizontal transportation, a concrete pump truck is added with a material distribution rod and is fed into a mold, an insertion type vibrator is adopted for vibration, and after the templates are removed, concrete nutrient solution is sprayed on the outer surface of the concrete in a transverse and vertical mode.
Further, in the step 2, the foundation bed leveling process adopts a riprap rammer for construction, when rough leveling is carried out, firstly, two stones for leveling are placed at a preset position to form a ridge-shaped two-stone pile, and then, a rammer plate in the riprap rammer is matched with a vibration hammer to level the two stones; and when the thin stone is finely leveled, continuously filling and leveling the uneven part between the two rough stones by using broken stones.
Furthermore, in the step 3, the gravity type foundation is hauled to a submergence area of the on-site semi-submerged barge, the gravity type foundation is installed and positioned by the positioning barge, the gravity type foundation is measured by a total station in the submergence process until the gravity type foundation is completely seated, backfill sand is adopted for backfill construction after the gravity type foundation is installed and qualified by inspection, the backfill sand is quantitatively filled by a sand pump, and the part which is not filled is manually filled.
Further, in the step 4, the hole-forming construction of the rock block foundation bed is carried out by combining a geological drilling machine sleeve follow-up drilling method and a hammering hole-forming method; grouting cement mortar for grouting through a mortar pump, a grouting pipeline and a mortar lifting reserved channel, and forming the gravity type foundation and the rock block foundation bed into an integral structure by using the hardened mortar; and in the grouting construction process, the slurry leakage inspection and plugging are carried out through the cooperation of divers.
Further, in the step 5, the placement of the twisting blocks is carried out by matching a barge crane with a diver, and the twisting blocks are placed according to the calculated network point positions of 95% of the designed block number.
The invention has the technical effects and advantages that:
(1) according to the gravity type foundation and tower frame structure, overturning moment and sliding force generated by an upper unit and an external environment are resisted mainly by means of the gravity type foundation and internal ballast weight, a slurry lifting reserved channel is reserved in a center pillar, a rock block foundation bed is subjected to hole forming through the slurry lifting reserved channel, cement mortar is poured into the rock block foundation bed and the lifting reserved channel, the gravity type foundation and the rock block foundation bed form an integrated structure, the gravity type foundation and the tower frame structure are guaranteed to be stable, and the gravity type foundation and tower frame structure can be well suitable for a foundation structure of an offshore wind turbine generator set and has the characteristics of high gravity center, large overturning moment and remarkable dynamic response;
(2) the structure of the invention has the characteristics of good integrity, good durability, convenient and fast construction and the like;
(3) the structure of the invention can save cost without using large-scale hoisting ships;
(4) most of the structure of the invention is integrally prefabricated and molded in a prefabrication field, the offshore field construction process is less, the construction is rapid, the construction period is greatly saved, and the construction cost is reduced;
(5) the gravity type foundation and the block stone foundation bed are connected into a whole by using a foundation bed mortar lifting process, and gaps in the block stone foundation bed are densely filled with cement mortar and coact with toe protection arrises to ensure the stability of the foundation bed, and the gravity type foundation and the block stone foundation bed coact with a twisting king block to prevent sea wave from being brushed without sedimentation.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a top view of FIG. 1;
in the figure: 1. the novel mortar grouting machine comprises a flange, 2 parts of a middle upright post, 3 parts of a stone foundation bed, 4 parts of a twisted king block, 5 parts of an accessory component, 6 parts of a mortar lifting reserved channel, 7 parts of a foundation expansion toe, 8 parts of a water inlet valve, 9 parts of the outer wall of a box body, 10 parts of a bottom plate and 11 parts of a box body partition plate.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Example (b):
as shown in fig. 1 and 2, a gravity type foundation for offshore wind power generation, the center of the gravity type foundation is a center pillar 2, a plurality of slurry-lifting reserved channels 6 penetrating through the center pillar are arranged in the center pillar 2, the slurry-lifting reserved channels 6 are uniformly distributed in the center pillar 2, the slurry-lifting reserved channels 6 are grouting steel pipes pre-embedded in the center pillar 2, the upper end of the center pillar 2 is connected with a fan tower, a flange plate 1 is pre-embedded on the upper end surface of the center pillar 2, the center pillar 2 is connected with the fan tower through the flange plate 1, an accessory component 5 is arranged on the upper portion of the center pillar 2, the accessory component 5 comprises a ship leaning component, a J-shaped pipe, an ice-breaking cone and a ladder stand, an octagonal box body is externally connected below the middle part of the center pillar 2, the octagonal box body is a large-diameter octagonal box body, the octagonal box body comprises a bottom plate 10, a box body outer wall 9 and box body partition plates 11 for partitioning the octagonal box body into a plurality of radial compartments, 1 one side of box baffle and 1 outer wall connection of center pillar, 11 opposite sides of box baffle are connected with box outer wall 9, leave the space between 1 bottom of box baffle and the bottom plate 10 and regard as wearing the water hole, a plurality of inlet valve 8 are installed to the lower part of box outer wall 9, inlet valve 8's number is confirmed according to the quantity of lobe, generally can set up 3~4 inlet valve 8, the bottom on gravity type basis is equipped with basis extension toe 7, center pillar 2 and octagonal box are prefabricated casting shaping as an organic whole.
A method for installing an offshore wind power generation gravity type foundation comprises the following steps:
step 1: the gravity type foundation is prefabricated in a prefabrication field, a movable tower crane is adopted to install a steel template and steel bars, the steel bar engineering is that hoisting steel bar pieces are combined with on-site manual penetration and binding, concrete is intensively mixed and supplied by a mixing station, a concrete tank truck is adopted for horizontal transportation, the concrete pump truck is filled with a material distribution rod and is vibrated by an insertion vibrator, a middle upright post 2, an octagonal box body and a foundation extension toe 7 are integrally cast and molded by utilizing the concrete and the steel bars, a grouting steel pipe is pre-embedded in the middle upright post 2 to form a grouting reserved channel 6, a flange plate 1 is pre-embedded in the upper end surface of the middle upright post 2, and after the template is removed, concrete maintenance liquid is respectively sprayed on the outer surface of the concrete in a transverse and vertical mode;
step 2: foundation bed construction, including foundation trench excavation, foundation trench riprap, foundation bed tamping and foundation bed leveling, forming a rock block foundation bed 3, wherein the foundation bed leveling process adopts a riprap tamping boat for construction, when the foundation bed leveling process is performed coarsely, two pieces of stones for leveling are firstly placed at a preset position to form a ridge-shaped two-piece stone pile, and then a tamping plate in the riprap tamping boat is used for leveling the two pieces of stones by matching with a vibration hammer; when the thin stone is finely leveled, continuously filling and tamping the rough and leveled uneven part between the two pieces of stone by using broken stones;
and step 3: installing a gravity type foundation, transporting the gravity type foundation to an installation position, towing the gravity type foundation to a submerged area of a field semi-submerged barge, installing the gravity type foundation by using floating transportation, positioning the installation of the gravity type foundation by using a positioning barge, opening all water inlet valves 8 to enable the gravity type foundation to be submerged by injecting water, meanwhile, the submersible pump is matched with the water injection into the bay to level the gravity type foundation, the submersible pump is placed in the sea to inject water into the bay, fine adjustment is carried out on ballast water of each compartment, measurement is carried out through a total station during the sinking process of the gravity type foundation until the gravity type foundation is contacted with the bottom of the rock-based bed, filling the gravity type foundation, after the gravity type foundation is installed and is checked to be qualified, performing backfill construction by adopting backfill sand, quantitatively throwing and filling the backfill sand by adopting a sand pump, and manually throwing and filling the part which is not filled with backfill to fill the filler in the middle upright post 2 and the bulkhead of the octagonal box body;
and 4, step 4: lifting slurry of a foundation bed, erecting a construction platform around a gravity type foundation, installing pore-forming equipment on the construction platform in place according to a slurry lifting reserved channel 6 reserved on a middle upright post 2, carrying out pore-forming on a rock block foundation bed 3 at the bottom of the gravity type foundation through the slurry lifting reserved channel 6 by the pore-forming equipment, and combining a geological drilling machine sleeve follow-up drilling method and a hammering pore-forming method for pore-forming on the rock block foundation bed 3; grouting the rock-based bed 3 and the slurry lifting reserved channel 6, preparing cement mortar for grouting by adopting a concrete mixing station for centralized slurry preparation, conveying the slurry to a mortar high-speed stirrer of a field transfer station for secondary stirring, grouting the cement mortar through a mortar pump, a grouting pipeline and the slurry lifting reserved channel, forming the gravity type foundation and the rock-based bed 3 into an integral structure by the hardened cement mortar, and meeting the bearing capacity requirements in the construction period and the service period; in the grouting construction process, a diver is matched with the block stone foundation bed 3 to check and plug the slurry leakage;
and 5: the method comprises the following steps that a toe protection prism is installed, twisting blocks 4 are placed around and above a foundation extension toe 7, the twisting blocks 4 are made of 3t concrete, the twisting blocks 4 are placed by matching a square barge crane with a diver, the twisting blocks 4 are placed according to 95% of the number of designed blocks, the twisting blocks 4 are constructed according to the mode of placing from bottom to top and randomly placing at fixed points, when the twisting blocks 4 are placed, the twisting blocks 4 are mutually close and stable, and inspection and leakage repair are performed after placement is completed;
step 6: and (4) mounting an accessory component, namely mounting the ship leaning component, the J-shaped pipe, the icebreaking cone and the ladder on the gravity type foundation by using bolts.
The invention can realize the assembly type integrated construction, most construction procedures are completed in a prefabricated yard, the construction procedures are fewer in the offshore site, and the construction period is greatly saved, thereby reducing the construction cost.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. A gravity type foundation for offshore wind power generation is characterized in that: the center on gravity type basis is the center pillar, set up a plurality of rising that run through the center pillar and starching the preformed channel in, fan tower section of thick bamboo is connected to the center pillar upper end, external octagonal box below the center pillar middle part, octagonal box includes bottom plate, box outer wall and separates into the box baffle of the radial lobe of a plurality of with octagonal box, box baffle one side and center pillar outer wall connection, box baffle opposite side and box outer wall connection leave the space between box baffle bottom and the bottom plate as the hole of wearing, and a plurality of inlet valves are installed to the lower part of box outer wall, gravity type basis's bottom is equipped with the basis extension toe, center pillar and octagonal box are prefabricated casting shaping as an organic whole.
2. An offshore wind power gravity foundation as set forth in claim 1 wherein: the flange plate is embedded in the upper end face of the middle upright post, and the middle upright post is connected with the fan tower barrel through the flange plate.
3. An offshore wind power gravity foundation as set forth in claim 1 wherein: an accessory component is installed on the upper portion of the middle upright post and comprises a ship leaning component, a J-shaped pipe, an icebreaking cone and a ladder.
4. An offshore wind power gravity foundation as set forth in claim 1 wherein: the slurry lifting reserved channel is formed by embedding a grouting steel pipe in the middle upright post in advance.
5. A method of installing an offshore wind power gravity foundation according to any of claims 1 to 4, wherein: the method comprises the following steps:
step 1: prefabricating a gravity type foundation, namely integrally casting and molding a middle upright post, an octagonal box body and a foundation extension toe by utilizing concrete and steel bars, embedding a grouting steel pipe in the middle upright post to form a slurry lifting reserved channel, and embedding a flange plate on the upper end surface of the middle upright post;
step 2: constructing a foundation bed, namely excavating a foundation trench, throwing stones into the foundation trench, tamping the foundation bed and leveling the foundation bed to form a blocky stone foundation bed;
and step 3: installing a gravity type foundation, transporting the gravity type foundation to an installation position, opening a water inlet valve to enable the gravity type foundation to be filled with water and sink, simultaneously utilizing a submersible pump to cooperate with water injection into a bay to level the gravity type foundation until the gravity type foundation is contacted with the bed bottom of the rock foundation, and then filling the gravity type foundation to enable the filling to be filled in the bays of the middle upright column and the octagonal box body;
and 4, step 4: lifting slurry of a foundation bed, erecting a construction platform around a gravity type foundation, installing pore-forming equipment on the construction platform in place according to a slurry lifting reserved channel reserved on a center pillar, carrying out pore-forming on a rock foundation bed at the bottom of the gravity type foundation through the slurry lifting reserved channel by the pore-forming equipment, and then grouting the rock foundation bed and the slurry lifting reserved channel;
and 5: installing toe protecting arris bodies, placing the twisting Chinese character blocks around and above the basic expanded toes, constructing the twisting Chinese character blocks according to a mode of placing from bottom to top and randomly placing at fixed points, wherein when the twisting Chinese character blocks are placed, the twisting Chinese character blocks are mutually close and stable, and checking and leak repairing are carried out after the placement is finished;
step 6: and (4) mounting an accessory component, namely mounting the ship leaning component, the J-shaped pipe, the icebreaking cone and the ladder on the gravity type foundation by using bolts.
6. The method for installing an offshore wind power gravity foundation according to claim 5, wherein the method comprises the following steps: in the step 1, the gravity type foundation is prefabricated in a prefabricated field, a movable tower crane is adopted to install steel templates and steel bars, the steel bar engineering is that hoisting steel bar pieces and field manual binding are combined, concrete is intensively mixed and supplied by a mixing station, a concrete tank truck is adopted for horizontal transportation, a concrete pump truck is filled with a material distribution rod and is vibrated by an insertion vibrator, and after the templates are removed, the outer surface of the concrete is transversely and vertically sprayed with concrete nutrient solution once.
7. The method for installing an offshore wind power gravity foundation according to claim 5, wherein the method comprises the following steps: in the step 2, the foundation bed leveling process adopts a riprap ramming boat for construction, when rough leveling is carried out, firstly, two stones for leveling are placed at a preset position to form a ridge-shaped two-stone pile, and then, a ramming plate in the riprap ramming boat is matched with a vibration hammer to level the two stones; and when the thin stone is finely leveled, continuously filling and leveling the uneven part between the two rough stones by using broken stones.
8. The method for installing an offshore wind power gravity foundation according to claim 5, wherein the method comprises the following steps: and 3, dragging the gravity type foundation to a submerged area of the on-site semi-submerged barge, positioning the gravity type foundation by using a positioning barge, measuring the gravity type foundation by using a total station in the sinking process until the gravity type foundation is completely seated, backfilling by using backfilled sand after the gravity type foundation is installed and qualified by inspection, and quantitatively throwing and filling the backfilled sand by using a sand pump, wherein the part which is not filled sufficiently is manually thrown and filled.
9. The method for installing an offshore wind power gravity foundation according to claim 5, wherein the method comprises the following steps: in the step 4, the hole-forming construction of the rock block foundation bed is carried out by combining a geological drilling machine sleeve follow-up drilling method and a hammering hole-forming method; grouting cement mortar for grouting through a mortar pump, a grouting pipeline and a mortar lifting reserved channel, and forming the gravity type foundation and the rock block foundation bed into an integral structure by using the hardened mortar; and in the grouting construction process, the slurry leakage inspection and plugging are carried out through the cooperation of divers.
10. The method for installing an offshore wind power gravity foundation according to claim 5, wherein the method comprises the following steps: in the step 5, the placement of the Queen twisting blocks is carried out by matching a square barge crane with a diver, and the placement of the Queen twisting blocks is carried out according to the calculated network point positions of 95% of the designed block number.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114687373A (en) * | 2022-03-23 | 2022-07-01 | 浙江浙能国电投嵊泗海上风力发电有限公司 | Gravity type rock-fill concrete offshore wind power foundation |
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Application publication date: 20220104 |