CN215715476U - Offshore wind power reducing screw pile composite cylindrical foundation - Google Patents
Offshore wind power reducing screw pile composite cylindrical foundation Download PDFInfo
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- CN215715476U CN215715476U CN202121360788.9U CN202121360788U CN215715476U CN 215715476 U CN215715476 U CN 215715476U CN 202121360788 U CN202121360788 U CN 202121360788U CN 215715476 U CN215715476 U CN 215715476U
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Abstract
The utility model discloses a composite cylindrical foundation of a reducing screw pile for offshore wind power, which comprises a reducing screw pile and a cylindrical foundation; firstly, the two are effectively combined, so that the composite bearing capacity of the whole structure is greatly improved, and the applicability of the foundation under complex ocean conditions is further improved; secondly, the two are connected through a quick connecting buckle, so that the construction is simple and convenient, the operation is convenient, and the construction period is greatly shortened; finally, compared with the traditional single-pile foundation, the spiral pile with the rotary blades is added, so that the resistance of the deep soil body can be fully exerted, and the resistance to pulling is good.
Description
Technical Field
The utility model relates to the field of offshore wind power foundation structures, in particular to an offshore wind power reducing screw pile composite cylindrical foundation.
Background
Since the 21 st century, the global economy has been increasing at a high rate, and the energy consumption has been increasing greatly with the high-rate increase of economy, so that the research and development of renewable energy resources are receiving more and more attention. In the development of renewable energy sources, wind power generation has the advantages of large reserves and wide distribution, so that the wind power generation becomes the key point of the development of new energy sources in the world at present. Compared with land power generation, offshore wind power has the advantages of stable wind direction, high wind speed, no occupation of cultivated land and the like, and becomes the key point of research of experts and scholars. In the future, offshore wind power is bound to develop from offshore to deep sea and faces loads of more complicated and changeable wind, wave, flow and the like, so that research on an offshore wind power foundation structure becomes a decisive factor for development of the offshore wind power industry.
Offshore wind power foundation structure forms are various, and single-pile foundations are most widely applied due to the fact that the single-pile foundations are simple in structure and the bearing mechanism research is relatively mature. At present, offshore wind power gradually develops to the deep sea, the stress condition is more complex, so the bearing performance requirement on a wind power foundation structure is more strict, the diameter and the length of a pile are generally required to be increased in order to increase the capacity of the pile for bearing horizontal, vertical, bending moment and anti-overturning load, the cost of the single pile foundation and the pile driving cost can be increased undoubtedly, meanwhile, certain difficulty is brought to the installation process, and the construction period is prolonged. The spiral pile is a pile type with spiral blades arranged outside the pile body, and a simple torque device is used for screwing the pile into a soil layer during installation, so that the installation is rapid. They also have significant pullout and compression resistance compared to straight-axis piles of the same diameter, and the use of such foundations can reduce the cost of offshore wind turbine structures.
In recent years, with the continuous development of the field of marine rock and soil, the cylindrical foundation is taken as a wind power foundation structure which is convenient to construct and install and has little influence on the marine ecological environment, and related contents such as the bearing mechanism of the cylindrical foundation are gradually improved, so that the cylindrical foundation also becomes a hotspot for research and application at present. The cylindrical foundation sinks by means of dead weight and negative pressure, can effectively resist horizontal loads generated by waves, ocean currents and the like, and meanwhile has good anti-overturning capacity and low construction cost. Compared with a single-pile foundation, the vertical bearing capacity of the cylindrical foundation is relatively weak, the skirt plate depth of the cylindrical foundation is usually increased aiming at the high-capacity wind generating set at present, but the measure can certainly cause the improvement of the fan construction and construction cost and the increase of the construction difficulty, and the construction period is increased to a certain extent. In the installation process of the cylinder foundation, the cylinder foundation cannot be installed at a specified position due to the complex seabed geological condition, the wrong negative pressure subsidence calculation, the soil plug effect generated by the cylinder subsidence and the like, and further the negative pressure subsidence failure happens occasionally. In addition to the negative pressure sinking, no better solution is available for the sinking problem of the barrel-type foundation.
Therefore, in order to solve the problems of insufficient vertical, horizontal and bending moment bearing capacity and anti-overturning capacity of the offshore wind power foundation and difficulty in installation, the utility model provides a structural form of a combination of a variable-diameter spiral pile and a cylindrical foundation with an opening in the middle.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a composite cylindrical foundation of a marine wind power reducing screw pile.
The utility model is realized by the following technical scheme:
a composite cylindrical foundation of a reducing screw pile for offshore wind power comprises a reducing screw pile and a cylindrical foundation;
the reducing screw pile comprises a wide-diameter part, a narrow-diameter part and a rotary vane, wherein the narrow-diameter part is positioned below the wide-diameter part and is connected into a whole, the outer wall of the wide-diameter part is provided with a quick connector-male fastener, and the rotary vane is arranged on the outer wall of the narrow-diameter part in a surrounding manner;
the cylindrical foundation comprises a cylindrical skirt, a top cover and a protective cylinder, the cylindrical skirt and the top cover form a cylindrical shape, an opening is formed in the center of the top cover, the protective cylinder is vertically arranged on the top cover around the opening, and the inner wall of the protective cylinder is provided with a quick connecting buckle-female buckle;
the reducing screw pile is arranged in an opening of the cylindrical foundation, the lower edge of the wide-diameter part is flush with the top cover, and the quick connecting buckle-male buckle of the wide-diameter part is fixedly butted with the quick connecting buckle-female buckle of the protective cylinder.
In the technical scheme, the upper end of the reducing spiral pile is connected with the tower cylinder casing of the wind turbine through a flange plate.
In the technical scheme, the reducing spiral pile is hollow inside.
In the above technical scheme, the reducing screw pile is a steel pipe pile.
In the above technical solution, the maximum outer diameter of the rotary vane is smaller than the diameter of the wide-diameter part.
In the above technical scheme, the quick buckle-pin buckle comprises a body, clamp springs, anti-rotation pins and sealing rings, wherein the body is provided with 2 clamp springs and 1 anti-rotation pin, and the sealing rings are respectively arranged above and below the clamp springs and the anti-rotation pins.
A construction method of an offshore wind power reducing screw pile composite cylindrical foundation comprises the following steps:
firstly, prefabricating a variable-diameter spiral pile and a cylindrical foundation, and then putting the cylindrical foundation into a seabed through two steps of self-weight sinking and negative pressure sinking; and then drilling a spiral pile into the middle casing part of the cylindrical foundation, and forming a unified whole after the quick connection and buckling are finished. If the negative pressure of the cylindrical foundation is not settled in place, after the quick connecting buckle finishes connection, the whole foundation reaches the designated position together by means of the penetration force of the rotation of the spiral pile rotating blades, and the foundation settlement is finished. And finally, installing a fan tower cylinder.
The utility model has the advantages and beneficial effects that:
1. the reducing spiral pile and the cylindrical foundation with the opening in the middle are connected into a whole through the quick connecting buckle, so that the pile cylinder can act in a synergistic manner, and the respective bearing capacity is fully exerted. The original pile foundation has good vertical bearing capacity and is weaker in horizontal, bending moment and anti-overturning bearing capacity, the increase of the cylindrical foundation enhances the overall horizontal, bending moment and overturning resisting capacity of the foundation, and meanwhile, the problem that the vertical bearing capacity is weaker when the cylindrical foundation is used as a single structure to bear force is solved. Meanwhile, the diameter and the length of the pile can be effectively reduced due to the existence of the cylindrical foundation, and the prefabrication and installation cost of the pile is greatly reduced. The two are effectively combined, the overall composite bearing capacity of the structure is greatly improved, and the applicability of the foundation under complex ocean conditions is further improved.
2. The traditional pile barrel composite structure is connected by grouting materials, the research on underwater grouting materials is not mature, and meanwhile, the underwater construction difficulty is high, and the consumed time is long. And the spiral pile is connected with the cylindrical foundation through quick connecting buckles, so that the construction is simple and convenient, the operation is convenient, and the construction period is greatly shortened.
3. The spiral pile is provided with the reducing structure, is convenient to install, has small construction difficulty, and can solve the problem that the barrel-shaped foundation is not sunk in place under negative pressure. Assuming that the screw pile does not have diameter change, 2 installation conditions can occur in the process of combined installation with the cylindrical foundation for the screw pile with a single diameter: 1) if sink with cartridge type basis negative pressure earlier and put in place, then at middle opening part installation screw pile, this moment cartridge type basis opening size should guarantee that the vane can pass through, so after the screw pile installed the assigned position, protect a section of thick bamboo and pile body surface space too big, can't adopt to connect fast and detain, can only use grouting material, will increase the construction degree of difficulty this moment, increase installation time, simultaneously if the cartridge type basis can't the negative pressure sink to the assigned position before, so whole basis will face the risk of installation failure. 2) If the screw pile is installed in place, the cylindrical foundation is hoisted to the height of the pile head when being sunk, and the installation difficulty is increased to a certain extent. Simultaneously because the barrel protects a section of thick bamboo inside to have to connect fast and detain, so leave for the space of pile body surface mounting less, the section of thick bamboo type basis can suffer the ocean current influence in the installation is sunk in-process inevitably, and then causes the disturbance to the pile body collision, has greatly increased the degree of difficulty that the section of thick bamboo type basis installation was sunk, if the section of thick bamboo type basis negative pressure sinks and can't reach the assigned position, then whole basis installation fails. And the screw pile sets up the reducing back, sinks earlier to the cartridge type basis and puts the installation, solves the installation location problem of screw pile, then drills into the screw pile in a casing position, makes the two adoption of a section of thick bamboo of stake detain fast and connect, the very big construction cycle who shortens offshore wind power basis, if when cartridge type basis negative pressure sinks to put and is difficult to reach the assigned position, can together arrive the assigned position with the help of the lower running force that screw pile vane selection dress produced simultaneously, solve the single problem of sinking of cartridge type basis. Compared with the traditional single-pile foundation, the spiral pile with the rotary blades is added, so that the resistance of the deep soil body can be fully exerted, and the pile has good resistance to pulling.
Drawings
FIG. 1 is a schematic plane structure diagram of an offshore wind power reducing screw pile composite cylindrical foundation.
Fig. 2 is a schematic view of a plane structure of the variable diameter screw pile.
Fig. 3 is a schematic view of a front view of a cylindrical foundation.
Fig. 4 is a schematic top view of the cylindrical foundation.
Fig. 5 is a schematic view (longitudinal section view) of the quick buckle structure.
Wherein: 1. reducing screw pile; 2. a cylindrical foundation; 3. a flange plate; 4. a wind turbine tower protective cylinder; 5. rotating leaves; 6. a skirt; 7. protecting the cylinder; 8. quickly connecting and buckling; 9. quick snap-pin; 10. an anti-rotation pin; 11. a clamp spring; 12. a seal ring; 13. a top cover; 14. quick snap-fastener-box; l1, wide diameter section; l2, narrow diameter portion.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
The technical scheme of the utility model is further explained by combining specific examples.
Example 1
As shown in fig. 1, the offshore wind power variable-diameter screw pile composite cylindrical foundation comprises a variable-diameter screw pile 1 and a cylindrical foundation 2; the reducing screw pile 1 is connected with the cylindrical foundation 2 with an opening in the middle through a quick connecting buckle 8.
As shown in fig. 2, the variable diameter screw pile is a hollow steel pipe pile, and is divided into a wide diameter part L1 and a narrow diameter part L2; the diameter of the spiral pile of the L1 section is D, and the bottom of the spiral pile is flush with the bottom of the top cover 13 of the cylindrical foundation 2; the rotary vane 5 is arranged on the L2 section of the spiral pile, the maximum range of the outer end of the rotary vane 5 of the section of the spiral pile is defined as D, and D is required to be less than or equal to D. The diameter, the length, the wall thickness, the number of the rotary vanes and the distance of the pile body of the reducing spiral pile 1 are determined by the integral stress balance and the installation requirements of the foundation.
The outer wall of the wide-diameter part L1 is provided with a quick connecting buckle-male buckle 9 which is used for being connected with a quick connecting buckle-female buckle 14 matched with the cylindrical foundation 2, so that the two parts form a whole and are stressed in a coordinated manner, and the integral installation of the foundation is better completed.
As shown in fig. 3 and 4, the cylindrical foundation is a middle opening and consists of a top cover 13, a cylindrical skirt 6 and a protective cylinder 7. The wall thicknesses of the top cover 13, the cylinder skirt 6 and the protective cylinder 7 and the heights of the cylinder skirt 6 and the protective cylinder 7 are determined according to the actual stress condition. The inside of the pile casing is provided with a quick connecting buckle-female buckle 14 for connecting the reducing screw pile 1.
As shown in fig. 5, the quick connection 8 of the reducing screw pile 1 is the key of the whole offshore wind power reducing screw pile composite cylindrical foundation, the quick connection 8 is divided into a male buckle 9 and a female buckle 14, wherein the male buckle 9 is arranged on the reducing screw pile 1, and the female buckle 14 is arranged inside the cylindrical foundation 2 protection cylinder 7.
The inside two jump rings 11 that are equipped with of pin 9 for pop out when screw pile 1 is connected with cartridge type basis 2, make the two even as an organic whole, increase its joint strength, avoid taking place vertical dislocation. Meanwhile, the anti-rotation pin 10 is arranged to bear higher torque, so that after the anti-rotation pin and the anti-rotation pin are connected, the cylindrical foundation 2 can reach a designated position together with the aid of the downward rotating penetrating force of the reducing screw pile 1.
Two sealing rings 12 are arranged inside the male buckle 9, so that high pressure can be borne, seawater can be effectively prevented from invading the connecting part, normal operation of the connecting component is guaranteed, and further the normal working state of the offshore wind power foundation is guaranteed.
At present, the offshore wind power construction and installation are time-consuming and long, the combined foundation is mostly connected by high-strength grouting materials, the joint of the combined foundation is usually positioned below the surface of a sea bed, great inconvenience is brought to construction, and the quick connecting buckle positioned inside the pile body and the cylindrical foundation pile casing is prefabricated on land, so that when the spiral pile is drilled into the sea bottom, the spiral pile is directly connected with the cylindrical foundation, and the installation time is greatly shortened.
Example 2
The construction process of the offshore wind power reducing screw pile composite cylindrical foundation according to the embodiment 1 is as follows:
firstly, prefabricating a variable-diameter spiral pile and a cylindrical foundation, and then putting the cylindrical foundation into a seabed through two steps of self-weight sinking and negative pressure sinking; and then drilling a spiral pile into the middle casing part of the cylindrical foundation, and forming a unified whole after the quick connection and buckling are finished. If the negative pressure of the cylindrical foundation is not settled in place, after the quick connecting buckle finishes connection, the whole foundation reaches the designated position together by means of the penetration force of the rotation of the spiral pile rotating blades, and the foundation settlement is finished. And finally, installing a fan tower cylinder.
The utility model has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the utility model fall within the scope of the utility model.
Claims (6)
1. The utility model provides a compound section of thick bamboo type basis of marine wind power reducing screw pile which characterized in that: comprises a reducing screw pile and a cylindrical foundation;
the reducing screw pile comprises a wide-diameter part, a narrow-diameter part and a rotary vane, wherein the narrow-diameter part is positioned below the wide-diameter part and is connected into a whole, the outer wall of the wide-diameter part is provided with a quick connector-male fastener, and the rotary vane is arranged on the outer wall of the narrow-diameter part in a surrounding manner;
the cylindrical foundation comprises a cylindrical skirt, a top cover and a protective cylinder, the cylindrical skirt and the top cover form a cylindrical shape, an opening is formed in the center of the top cover, the protective cylinder is vertically arranged on the top cover around the opening, and the inner wall of the protective cylinder is provided with a quick connecting buckle-female buckle;
the reducing screw pile is arranged in an opening of the cylindrical foundation, the lower edge of the wide-diameter part is flush with the top cover, and the quick connecting buckle-male buckle of the wide-diameter part is fixedly butted with the quick connecting buckle-female buckle of the protective cylinder.
2. The offshore wind power variable-diameter screw pile composite cylindrical foundation as claimed in claim 1, wherein: the upper end of the reducing spiral pile is connected with a protective cylinder of a tower of a wind turbine through a flange plate.
3. The offshore wind power variable-diameter screw pile composite cylindrical foundation as claimed in claim 1, wherein: the reducing screw pile is hollow inside.
4. The offshore wind power variable-diameter screw pile composite cylindrical foundation as claimed in claim 1, wherein: the reducing spiral pile is a steel pipe pile.
5. The offshore wind power variable-diameter screw pile composite cylindrical foundation as claimed in claim 1, wherein: the maximum outer diameter of the rotary vane is smaller than the diameter of the wide-diameter part.
6. The offshore wind power variable-diameter screw pile composite cylindrical foundation as claimed in claim 1, wherein: the quick connecting buckle-male buckle comprises a body, clamp springs, anti-rotating pins and sealing rings, wherein the body is provided with 2 clamp springs and 1 anti-rotating pin, and the sealing rings are respectively arranged above and below the clamp springs and the anti-rotating pins.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121360788.9U CN215715476U (en) | 2021-06-18 | 2021-06-18 | Offshore wind power reducing screw pile composite cylindrical foundation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121360788.9U CN215715476U (en) | 2021-06-18 | 2021-06-18 | Offshore wind power reducing screw pile composite cylindrical foundation |
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| CN215715476U true CN215715476U (en) | 2022-02-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116623709A (en) * | 2023-07-13 | 2023-08-22 | 中国电建集团重庆工程有限公司 | Deepwater pile-tube combined foundation for offshore wind power |
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2021
- 2021-06-18 CN CN202121360788.9U patent/CN215715476U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116623709A (en) * | 2023-07-13 | 2023-08-22 | 中国电建集团重庆工程有限公司 | Deepwater pile-tube combined foundation for offshore wind power |
| CN116623709B (en) * | 2023-07-13 | 2024-05-14 | 中国电建集团重庆工程有限公司 | Deepwater pile-tube combined foundation for offshore wind power |
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