CN211898504U - Offshore wind power single pile-friction cone composite foundation - Google Patents
Offshore wind power single pile-friction cone composite foundation Download PDFInfo
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- CN211898504U CN211898504U CN201922297734.1U CN201922297734U CN211898504U CN 211898504 U CN211898504 U CN 211898504U CN 201922297734 U CN201922297734 U CN 201922297734U CN 211898504 U CN211898504 U CN 211898504U
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Abstract
The utility model discloses a marine wind power single pile-friction awl composite foundation, including single pile and friction awl, the friction awl is inside to be the rockfill body, and the outside is glued rockfill body shell, glued rockfill body shell is the outside rockfill body of the glued friction awl of grout and obtains. The utility model discloses a marine wind power single pile-friction cone composite foundation has the level and bears the dynamic height, and pile body horizontal displacement is little, warp and moment of flexure advantage such as little, possesses the construction simply, characteristics such as geological conditions adaptation is strong.
Description
Technical Field
The utility model relates to an offshore wind power technical field especially relates to an offshore wind power single pile-friction cone composite foundation and construction method thereof.
Background
As a clean energy, the offshore wind power has the characteristics of high wind speed, stable wind speed, large single-machine capacity and the like. The offshore wind power industry is in a high-speed development stage. Due to the complex geological conditions of the sea area, the great difficulty of the offshore wind power construction technology and the high construction cost, the offshore wind power plant cost accounts for 15-25% of the total cost according to statistics. At present, the basic types of offshore wind turbine foundations can be classified into gravity type, mono-pile type, suction drum type, triple-pile type, jacket type, and floating type according to offshore distance. The single-pile foundation can adapt to different geological conditions, has the advantages of high construction speed, low engineering cost and the like, is widely used, and accounts for more than 70 percent in the built offshore wind power plant.
During the operation of an offshore wind turbine, horizontal loads required to be borne by the single-pile foundation comprise wind loads, wave loads, ocean current loads, sea ice loads and the like, vertical loads required to be borne comprise loads of a fan unit and loads of a pile body, and under the action of various circulating horizontal loads, the single-pile foundation can generate large transverse displacement and rotation. The geological conditions of part of the sea areas in China are quite complex, the covering layer soil body is usually composed of silt, silt clay, fine sand, silt sand and the like, and the fluctuation of the bedrock surface below the covering layer is obvious due to the large difference of the thickness of the covering layer. With the increase of the capacity of the fan unit and the increase of the offshore distance, the requirement of the unit on the bearing capacity of the foundation is met by increasing the pile diameter and the pile length. Meanwhile, for the sea area with the boulders in the deep water shallow covering layer, rock-socketed pile foundation construction needs to be carried out, the boulder detection difficulty is high, the boulders are prone to causing curling, hole blocking, hole collapse and the like of the steel pipe pile, the construction risk is high, the construction progress is slow, if the boulders are mistakenly judged to be complete bedrocks during exploration, the pile end can be located in the boulders, and the stability of the fan is obviously affected.
Based on this, the urgent need provides a novel marine fan single pile basis formula, makes it can be applicable to deep water shallow overburden, the sea area that has the boulder, and novel basis formula makes the pile foundation need not to deepen in the basement rock, just can provide sufficient bearing capacity, satisfies the fan unit to the demand of high level bearing capacity and little displacement, and novel basis formula reduces the construction risk, improves construction speed, reduces construction cost, guarantees the safety and stability operation of fan.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the utility model provides an offshore wind power single pile-friction cone composite foundation and a construction method thereof, which strengthens the soil body around the pile and improves the bearing capacity of the soil body around the pile by arranging a friction cone on a single pile and an offshore bed; through the interaction of the single pile and the friction cone, and the interaction of the friction cone and the pile foundation soil body, the horizontal bearing capacity of the composite foundation is improved, and the horizontal displacement of the composite foundation on a mud surface, the deformation of a pile body and the bending moment are reduced; the friction cone is composed of an internal rock-fill body and a cemented rock-fill body shell, is integrally of a semi-rigid permeable structure, can adapt to foundation settlement deformation, and can provide a drainage channel for consolidation drainage of a foundation soil body under the action of gravity.
In order to realize the technical characteristics, the purpose of the utility model is realized as follows: an offshore wind power single pile-friction cone composite foundation, comprising:
the single pile adopts a large-diameter steel pipe pile;
the friction cone is internally provided with a rock-fill body, the outside of the friction cone is provided with a cemented rock-fill body shell, the cemented rock-fill body shell is obtained by cementing the rock-fill body on the surface of the friction cone by adopting a grouting method, and the single pile is positioned in the central area of the friction cone;
the rockfill body is formed by piling graded broken stone materials; the grouting material is underwater self-protection type cementing material.
The cemented rockfill shell is obtained by filling an underwater self-protection type cementing material into a gap of the rockfill body at the periphery of the friction cone under the action of self weight and solidifying and bonding the rockfill body through the cementing material; the graded broken stone material is a rockfill material with a wide grading interval, meets the requirements of foundation deformation and grouting and cementing of the underwater self-protection type cementing material, and is a cement-based cementing material suitable for a seawater environment.
The underwater self-protection type cementing material adopts one or more of underwater self-protection type self-compaction cement paste, underwater self-protection type self-compaction cement mortar and underwater self-protection type self-compaction concrete.
The structure type of the cemented rockfill shell is one or more combined structures of a pervious concrete structure, a rockfill concrete structure or a reinforced rockfill concrete structure.
The graded broken stone material is one or more of rockfill, tailing rockfill and waste slag, precast concrete blocks and waste concrete blocks.
The bottom of the rockfill body is cemented into a cemented rockfill body with high porosity by adopting an underwater self-protection type cementing material, or a rigid water-permeable and sludge-permeable frame is laid at the bottom of the rockfill body.
The utility model discloses there is following beneficial effect:
according to the offshore wind power single pile-friction cone composite foundation provided by the embodiment of the utility model, the friction cone arranged around the single pile strengthens the foundation soil body, improves the bearing capacity of the foundation soil body, and further improves the bearing capacity of the single pile; the single pile and the friction cone are connected in a friction connection mode, when the horizontal bearing capacity or the vertical bearing capacity borne by the single pile is large, the single pile and the friction cone can generate relative displacement, and the friction cone provides horizontal resistance through friction action, so that the integral horizontal bearing capacity of the composite foundation is improved; the friction awl comprises inside rockfill and cemented rockfill shell, inside rockfill can adapt to the deformation of the ground soil body, consolidation drainage for the ground soil body provides drainage channel simultaneously, the whole atress of friction awl can be guaranteed to outside cemented rockfill shell, effectively improve the maximum horizontal resistance that the friction awl can provide, improve the whole horizontal bearing capacity of composite foundation, reduce composite foundation's slope and warp, reduce pile shaft deformation and moment of flexure, outside cemented rockfill shell can also prevent the washing away of wave and ocean current to the ground soil body simultaneously, improve composite foundation's stability. Because the utility model discloses offshore wind power single pile-friction cone composite foundation is showing the horizontal bearing capacity that has improved composite foundation, consequently applicable in shallow overburden in deep water and have the sea area of boulder for offshore wind farm construction.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic view of the overall structure according to the present invention.
Fig. 2 is a schematic diagram of a basic three-dimensional structure according to the present invention.
In the figure: the self-protecting underwater concrete pile comprises a single pile 1, a friction cone 2, an underwater self-protecting cementing material 3 and a graded crushed stone 4;
a rock-fill body 21 and a cemented rock-fill body shell 22.
Detailed Description
The following describes embodiments of the present invention with reference to the accompanying drawings.
Referring to fig. 1 and 2, the offshore wind power single pile-friction cone composite foundation comprises a single pile 1 and a friction cone 2, wherein the single pile 1 is a large-diameter steel pipe pile, the friction cone 2 is composed of an inner rock-fill body 21 and an outer cemented rock-fill body 22 shell, the cemented rock-fill body 22 shell is obtained by filling an underwater protective cementing material 3 into a gap of the outer rock-fill body of the friction cone 2 and then hardening and solidifying, the rock-fill body is obtained by piling graded crushed stones on a seabed near the single pile 1, and a particle size interval of the graded crushed stones and an average particle size of the crushed stones are gradually reduced from top to bottom according to the friction cone.
It can be understood that the underwater self-protection type cementing material only hardens and solidifies the rockfill with a certain thickness outside the friction cone into a cemented rockfill shell, the rockfill inside the friction cone is still a flexible structure formed by piling up scattered particles, and the cemented rockfill shell formed by cementing the cementing material outside the friction cone is a rigid structure, so the friction cone can be regarded as a semi-rigid gravity structure or a semi-flexible gravity structure. The rockfill body inside the friction cone can adapt to the deformation of the foundation soil body of the composite foundation, and meanwhile, the rockfill body has high porosity, so that a drainage channel can be provided for consolidation drainage of the foundation soil body, the consolidation process of the foundation soil body is accelerated, the bearing capacity of the foundation soil body is improved, and the high-void structure of the rockfill body on the lower portion can meet the flowing of foundation silt in the pores, so that the composite foundation is suitable for the seabed with silt on the upper portion. The motion of the inside rockfill is retrained to a certain extent to the outside glued rockfill shell of friction awl, guarantees the whole atress of friction awl under the load effect, can fully mobilize the horizontal resistance that the friction awl provided simultaneously, and then improves the horizontal bearing capacity of composite foundation, reduces composite foundation horizontal displacement, pile body deformation and moment of flexure. The single pile in the middle of the friction cone is in contact connection with the rock-fill body in the friction cone in a friction mode, so that the transmission of horizontal load between the single pile and the friction cone is facilitated, and the integral horizontal bearing capacity of the composite foundation is improved. The friction cone cemented rock-fill body shell formed by grouting cementation can avoid the scouring of waves and ocean currents on the soil body of the composite foundation and improve the stability of the composite foundation.
Specifically, the underwater self-protection type cementing material is a cement-based cementing material suitable for a seawater environment, and can be one of underwater self-protection type self-compaction cement paste, underwater self-protection type self-compaction cement mortar and underwater self-protection type self-compaction concrete.
It is understood that the cement-based cementing material suitable for the seawater environment means that the cement-based cementing material can not disperse in the seawater environment and can maintain the original rheological property and cementing property, so that the underwater self-protection cementing material can fill the gaps of the rock-fill body outside the friction cone under the action of the self weight. Meanwhile, the outer rock-fill body of the friction cone can be solidified and bonded into a cemented rock-fill body shell according to corresponding rheological property parameters. The mechanical property parameters of the cemented rockfill shell are controlled by the rheological property parameters and the mechanical property parameters of the cementing material. Tests have found that the strength of the cemented rock-fill body in a seawater environment is slightly lower than that of a land cemented rock-fill body.
Specifically, the friction cone is composed of an inner rock-fill body and an outer cemented rock-fill body shell, and the structure type of the cemented rock-fill body is one or more combined structures of a pervious concrete structure, a rock-fill concrete structure or a reinforced rock-fill concrete structure.
It will be appreciated that the type of structure of the cemented rock-fill body can be controlled by varying the type of "graded gravel" material and the type of underwater self-supporting cementitious material used for the body. The cemented rock-fill body formed by pouring the graded broken stone material with large particle size by the high-performance underwater self-protection type cementing material can keep a gap structure before the rock-fill body is poured, and at the moment, the holes in the cemented rock-fill body are still communicated, so that the formed structure type is similar to a pervious concrete structure; if the underwater self-protection type cementing material completely fills the void space of the rockfill outside the friction cone, the formed cemented rockfill is of a high-strength compact structure and does not have water permeability, and the formed structure type is similar to a concrete structure or a rockfill concrete structure; if the friction cone is externally provided with a steel bar framework composite structure, and the underwater self-protection type cementing material completely fills the space of the rockfill body inside the steel bar framework, the formed structural type is a reinforced rockfill concrete structure. In addition, the cemented rock-fill body shell may also be constructed from a combination of two or three structural types, depending on the needs of the site operation.
Specifically, the graded crushed stone material is one or more of conventional rockfill, tailing rockfill and waste slag, and the use of the tailing rockfill and the waste slag realizes waste recycling.
Specifically, the rock-fill body at the bottom of the friction cone can be cemented into a cemented rock-fill body with high porosity by adopting an underwater self-protection cementing material or a rigid frame is laid at the bottom of the rock-fill body, the whole stress of the rock-fill body can be enabled to be applied to the bottom of the rock-fill body by adopting the cemented rock-fill body with high porosity or the rigid frame, and the friction cone can be uniformly settled.
Claims (6)
1. The utility model provides an offshore wind power single pile-friction cone composite foundation which characterized in that, it includes:
the single pile (1) adopts a large-diameter steel pipe pile;
the friction cone (2), a rock-fill body (21) is arranged inside the friction cone (2), a cemented rock-fill body shell (22) is arranged outside the friction cone (2), the cemented rock-fill body shell (22) is obtained by cementing the rock-fill body on the surface of the friction cone by adopting a grouting method, and the single pile (1) is positioned in the central area of the friction cone;
the rockfill body (21) is formed by stacking graded broken stone materials (4); the material adopted by grouting is an underwater self-protection type cementing material (3).
2. The offshore wind power single pile-friction cone composite foundation as claimed in claim 1, wherein: the cemented rockfill body shell (22) is obtained by filling an underwater self-protection cementing material (3) into a gap of a rockfill body at the periphery of the friction cone under the action of self weight and solidifying and cementing the rockfill body by the cementing material; the graded broken stone material (4) is a rockfill material with a wide grading interval, the graded broken stone material (4) meets the requirements of foundation deformation and underwater self-protection cementing material grouting and cementing, and the underwater self-protection cementing material (3) is a cement-based cementing material suitable for a seawater environment.
3. The offshore wind power single pile-friction cone composite foundation as claimed in claim 1 or 2, wherein: the underwater self-protection type cementing material (3) adopts one or more of underwater self-protection type self-compaction cement paste, underwater self-protection type self-compaction cement mortar and underwater self-protection type self-compaction concrete.
4. The offshore wind power single pile-friction cone composite foundation as claimed in claim 1 or 2, wherein: the structure type of the cemented rockfill shell (22) is one or more combined structures of a pervious concrete structure, a rockfill concrete structure or a reinforced rockfill concrete structure.
5. The offshore wind power single pile-friction cone composite foundation as claimed in claim 1 or 2, wherein: the graded broken stone material is one or more of rockfill, tailing rockfill and waste slag, precast concrete blocks and waste concrete blocks.
6. The offshore wind power single pile-friction cone composite foundation as claimed in claim 1, wherein: the bottom of the rockfill body (21) is cemented into a cemented rockfill body with high porosity by adopting an underwater self-protection cementing material (3) or a rigid water-permeable and sludge-permeable framework is laid at the bottom of the rockfill body.
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| CN201922297734.1U CN211898504U (en) | 2019-12-19 | 2019-12-19 | Offshore wind power single pile-friction cone composite foundation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984213A (en) * | 2019-12-19 | 2020-04-10 | 中国长江三峡集团有限公司 | Offshore wind power single pile-friction cone composite foundation and construction method thereof |
| CN116607556A (en) * | 2023-07-19 | 2023-08-18 | 江苏道达风电设备科技有限公司 | Flexible anti-scouring method and protection system for offshore wind power foundation in operation and maintenance period |
-
2019
- 2019-12-19 CN CN201922297734.1U patent/CN211898504U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984213A (en) * | 2019-12-19 | 2020-04-10 | 中国长江三峡集团有限公司 | Offshore wind power single pile-friction cone composite foundation and construction method thereof |
| CN116607556A (en) * | 2023-07-19 | 2023-08-18 | 江苏道达风电设备科技有限公司 | Flexible anti-scouring method and protection system for offshore wind power foundation in operation and maintenance period |
| CN116607556B (en) * | 2023-07-19 | 2023-09-26 | 江苏道达风电设备科技有限公司 | Flexible anti-scouring method and protection system for offshore wind power foundation in operation and maintenance period |
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