CN112814021A - Post-installation reinforcing device and method for offshore single-pile foundation - Google Patents
Post-installation reinforcing device and method for offshore single-pile foundation Download PDFInfo
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- CN112814021A CN112814021A CN202110249563.4A CN202110249563A CN112814021A CN 112814021 A CN112814021 A CN 112814021A CN 202110249563 A CN202110249563 A CN 202110249563A CN 112814021 A CN112814021 A CN 112814021A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
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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
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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Abstract
The invention discloses a post-installation reinforcing device and an installation method for an offshore single-pile foundation, wherein the device comprises an inclined strut, an upper lantern ring, a lower lantern ring and a lower annular plate; the lower lantern ring is connected with the lower annular plate through a cross brace, the upper lantern ring is connected with the lower annular plate through an inclined brace, the diameter of the lower annular plate is larger than the diameters of the upper lantern ring and the lower lantern ring, the upper lantern ring, the lower lantern ring and the lower annular plate are split along the circumferential direction, an insertion type pile and an anchoring foundation are arranged below the lower annular plate, and the insertion type pile is inserted into the anchoring foundation; the device does not bear the vertical and transverse loads of the upper fan, mainly provides an additional pile-soil effect, reinforces the foundation of the integral supporting structure, improves the frequency, and is convenient to install in the later period due to the split design scheme adopted by the upper lantern ring, the lower lantern ring and the lower lantern ring; each component weight is less, need not special transportation installation ship, reduces transportation and construction cost, and is more economical with the scour prevention scheme contrast of using always.
Description
Technical Field
The invention belongs to the field of single-pile foundations of wind generating sets, and particularly relates to a post-installation reinforcing device and an installation method of an offshore single-pile foundation.
Background
Offshore wind energy is abundant, is adjacent to economic developed load centers in the east and south, and has great significance for supporting strategic transformation of energy sources by vigorously developing offshore wind power. The type of wind turbine foundation is one of the biggest differences between offshore wind power generation and onshore, and offshore wind turbine foundations comprise single piles, high pile cap, jacket, suction tube, gravity type foundation and the like, wherein the single pile foundation is the most widely used foundation type.
Offshore wind farms are in poor soil conditions, and the topsoil is mostly clay, deep and thick. The wind turbine foundation is built in shallow sea and intertidal zone with water depth not more than 20m, and due to the action of tide and ocean current, soil around the wind turbine foundation is washed away, mud around the pile and the foundation is taken away, so that the bearing capacity of the pile body is reduced, the foundation is inclined, and the frequency of the whole supporting structure is reduced. Because the frequency of the single-pile foundation is sensitive to the elevation and the rigidity of the mud surface, once the frequency is reduced, the acceleration of the machine head is increased, so that the machine is stopped, and the loss of an owner is greatly increased.
Common reinforcement means for improving the erosion of the wind turbine foundation include sand quilt, riprap, solidified soil and the like. However, when the scouring range and depth are large, the cost of the common means is huge, and the landfill treatment cost for a single machine site exceeds 1000 ten thousand yuan. And because the gaps inevitably exist among the sand, the stone and the solidified soil, the sand and the sand are taken away by the seawater, the stone sinks, and after a period of time, the stone sinks below the mud surface, and the elevation of the mud surface needs to be continuously maintained.
Based on the reasons, an anti-scouring treatment method of the offshore wind turbine single pile foundation, which is low in cost and convenient for later maintenance, needs to be found.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a post-installation reinforcing device and an installation method for an offshore single-pile foundation, which can improve the structural rigidity of a single pile and enable the frequency of a fan to meet the normal operation requirement; the detachable two-piece scheme is adopted, so that the installation at the later stage is convenient; and a special transport and installation ship is not needed, and the transport and construction cost is reduced.
In order to achieve the purpose, the invention adopts the technical scheme that: a rear mounting and reinforcing device for an offshore single-pile foundation comprises an inclined strut, an upper sleeve ring, a lower sleeve ring and a lower ring plate; the lower lantern ring is connected with the lower ring plate through the cross arm, the upper lantern ring is connected with the lower ring plate through the diagonal brace, the diameter of the lower ring plate is larger than the diameter of the upper ring sleeve and the lower ring sleeve, the upper lantern ring, the lower lantern ring and the lower ring plate are split along the circumferential direction, the lower part of the lower ring plate is provided with the plug-in piles and the anchoring foundation, and the plug-in piles are inserted into the anchoring foundation.
The single pile is characterized by further comprising a plurality of convex rings, the outer sides of the single piles are provided with a plurality of convex rings, the outer sides of the convex rings are sleeved with an upper sleeve ring and a lower sleeve ring, and rubber pads are arranged on the inner sides of the upper sleeve ring and the lower sleeve ring.
The surfaces of the convex ring, the inclined strut, the upper lantern ring, the lower annular plate and the plug-in pile are all provided with anti-corrosion layers.
The anchoring foundation is a driving pile foundation or a suction barrel pile foundation.
Go up the lantern ring, down the lantern ring and all divide into two semi-rings along circumference with lower crown plate, go up the lantern ring and down crown plate and bracing welded connection, lower lantern ring and lower crown plate and welded connection, bottom bayonet stake and lower crown plate welded connection.
The quantity and the position of the bottom inserting type piles are arranged in one-to-one correspondence with the inclined struts.
And locking mechanisms are arranged on the outer sides of the upper sleeve ring, the lower sleeve ring and the single pile.
The lower lantern ring and the lower lantern ring plate are connected through a hinge or a rivet.
The invention relates to an installation method of a post-installation reinforcing device of an offshore single-pile foundation, which comprises the following steps:
prefabricating a reinforcing tool in a factory, and integrally manufacturing and connecting the inclined strut, the upper lantern ring, the lower annular plate and the inserted pile;
driving the anchoring foundation, and inserting the interpolation pile into the anchoring foundation;
the split parts of the upper lantern ring are connected with each other, the split parts of the lower lantern ring are connected with each other, and the split parts of the lower lantern ring plate are connected with each other.
According to the design, a plurality of convex rings are welded on the surface of the single pile,
during prefabrication, hinges are arranged at the split end parts of the lower lantern ring and the lower annular plate in advance, and the hinges are locked after being connected at the installation positions.
Compared with the prior art, the invention has at least the following beneficial effects: the device does not bear the vertical and transverse loads of the upper fan, mainly provides an additional pile-soil effect, reinforces the foundation of the integral supporting structure and improves the frequency, and can improve the rigidity of a single-pile structure so that the frequency of the fan meets the normal operation requirement; the upper lantern ring, the lower lantern ring and the lower lantern ring adopt a split design scheme, so that the later-stage installation is facilitated; each component weight is less, need not special transportation installation ship, reduces transportation and construction cost, and is more economical with the scour prevention scheme contrast of using always.
Further, the bulge loop sets up a plurality ofly in the single pile outside, goes up the lantern ring and overlaps the cover with lower and establishes in the bulge loop outside, can carry out the installation of co-altitude not to actual demand, goes up the lantern ring and overlaps the intra-annular with lower and sets up the cushion, goes up the lantern ring and overlaps the wholeness of ring and single pile down with the improvement.
Furthermore, the lower lantern ring and the lower lantern ring plate are connected through the hinge or the rivet more quickly and are easy to implement on site.
Compared with the common anti-scouring scheme, the method for installing the reinforcing device after the offshore single-pile foundation is more economical in stone throwing, the expected effect of implementation is more accurate, the parts of the device are prefabricated in a factory, the offshore field operation amount is greatly reduced, the implementation period is short, and the cost is greatly saved.
Drawings
Fig. 1 is a schematic diagram of a marine single-pile foundation reinforcing tool capable of being implemented.
Fig. 2 is a schematic structural diagram of a reinforcement tool assembly that can be implemented in accordance with the present invention.
Fig. 3 is a schematic view of a single pile foundation and a convex ring structure in accordance with an embodiment of the present invention.
1-tower frame, 2-single pile, 3-reinforcing tool, 4-convex ring, 31-inclined strut, 33-lower lantern ring, 34-lower ring plate, 35-hinge and 4-convex ring
Detailed Description
The above and other features and advantages of the present invention will become more apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings,
examples
Referring to fig. 1 and 2, the tower frame 1 is arranged at the top of the single pile 2, the reinforcing tool 3 is installed above the mud surface of the single pile 2, the reinforcing tool 3 comprises an inclined strut 31, an upper lantern ring 32, a lower lantern ring 33 and a lower annular plate 34, a bottom plug-in pile 36 is connected with an anchoring foundation 37 through grouting, a detachable two-piece split type structure is adopted, the upper lantern ring 32 and the lower lantern ring 33 are connected into a whole through a hinge 35, the hinge 35 and one end of the upper lantern ring 32 and one end of the lower lantern ring 33 are preassembled during manufacturing, later-stage installation is facilitated, the weight of each component is smaller, a special transportation installation ship is not needed, and transportation and construction costs.
Go up lantern ring 32 and lower lantern ring 33 and the single pile 2 outside and set up locking mechanism, it is specific, can set up a plurality of screw holes along circumference on going up lantern ring 32 and the lower lantern ring 33, screw hole department carries out the reinforcement design, and installation locking bolt locks lantern ring 32 and lower lantern ring 33 respectively with single pile 2.
As an alternative embodiment, the anchoring base 37 may be a driven pile base or a suction sleeve pile base, depending on the actual project geology.
When the frequency is reduced due to the fact that scouring exceeds a design value in the operation of an actually built offshore wind farm, and the unit is shut down due to the fact that acceleration exceeds a limit value, the reinforcement tool can be used. In addition, compared with a common anti-scouring scheme, the tool scheme provided by the invention is more economical for stone throwing and the like.
Referring to fig. 1 and 3, need to set up multichannel bulge loop 4 when making the single pile earlier stage, the bulge loop welding is on single pile major structure, goes up lantern ring 32 and lower lantern ring 33 cover and establishes in the bulge loop 4 outside, and the later stage can be according to the installation that different scour depths strengthened the frock, and the bulge loop 4 through the single pile basis is adjusted the height and is fixed.
The inner sides of the upper lantern ring 32 and the lower lantern ring 33 are provided with rubber mats for being tightly connected with the single pile foundation main body.
Based on the scheme of the invention, when the wind turbine generator system is implemented at a certain sea, the height, the diameter, the size of the inclined strut and other components of the reinforcing tool 3 can be optimized according to actual projects. Specifically, in this embodiment:
the outer diameter D1 of the single pile 2 is 7m, the upper convex ring 4 of the single pile is welded by steel bars with the diameter of 15mm, and the convex ring interval h1 is 2.8 m.
The height H of the inclined strut 31 is 10m, and the thickness is 20 mm; the height h2 of the upper collar 32 is 2.8m, and the thickness is 15 mm; the height h3 of the lower ring 33 is 15mm, and the thickness is 15 mm; the diameter D4 of the lower ring plate 34 is 14m and the thickness is 20 mm.
The diameter D3 of the anchoring base 37 is 2m, and the wall thickness is 35 mm; the diameter of the bottom inserting type pile 36 is 1.55m, and the bottom inserting type pile is connected with the anchoring foundation 37 through grouting.
The main body structure of the single pile 2 is manufactured in a factory, and a plurality of convex rings 4 are welded on the surface according to design requirements.
The specific construction method comprises the following steps:
after the scouring depth exceeds the design value and causes the fan to stop, the feasibility of adopting the reinforcing tool 3 is evaluated
All parts of the reinforcing tool 3 are prefabricated and connected in a factory, the inclined strut 31, the upper lantern ring 32, the lower lantern ring 33, the lower ring plate 34 and the inserted pile 36 are integrally manufactured and welded, the split bodies of the upper lantern ring 32, the lower lantern ring 33 and the lower ring plate 34 are prefabricated into 2 pieces respectively, a hinge 35 is installed at the end part of each split body in advance, and all parts of the reinforcing tool 3 are subjected to corrosion prevention treatment;
an inserted anchoring foundation 37 is driven into the vicinity of the machine site or a suction cylinder anchoring foundation is installed;
transporting the reinforcing tool 3 to an on-site machine site;
installing 2 integral reinforcing tools and locking the hinge 35;
and finishing the installation.
Claims (10)
1. The utility model provides an installation reinforcing apparatus behind marine single pile basis which characterized in that: comprises an inclined strut (31), an upper lantern ring (32), a lower lantern ring (33) and a lower lantern ring plate (34); lower lantern ring (33) and lower crown plate (34) are connected through the stull, go up lantern ring (32) and lower crown plate (34) and connect through bracing (31), the diameter of lower crown plate (34) is greater than the diameter of last ring cover and lower crown plate, go up lantern ring (32), lower lantern ring (33) and lower crown plate (34) and be split type along circumference, the below of lower crown plate (34) is provided with bayonet stake (36) and anchor basis (37), bayonet stake (36) insert anchor basis (37).
2. The offshore mono-pile foundation after-installation reinforcing device of claim 1, wherein: still include bulge loop (4), bulge loop (4) set up a plurality ofly in single pile (2) outside, go up lantern ring (32) and lower lantern ring (33) cover and establish in the bulge loop (4) outside, go up lantern ring (32) and lower lantern ring (33) inboard and set up the cushion.
3. The offshore mono-pile foundation after-installation reinforcing device of claim 2, wherein: the surfaces of the convex ring (4), the inclined strut (31), the upper lantern ring (32), the lower lantern ring (33), the lower annular plate (34) and the plug-in pile (36) are all provided with anticorrosive coatings.
4. The offshore mono-pile foundation after-installation reinforcing device of claim 1, wherein: the anchor base (37) is a driven pile base or a suction tube pile base.
5. The offshore mono-pile foundation after-installation reinforcing device of claim 1, wherein: the upper lantern ring (32), the lower lantern ring (33) and the lower ring plate (34) are all divided into two half rings along the circumferential direction, the upper lantern ring (32) and the lower ring plate (34) are connected with the inclined strut (31) in a welding mode, the lower lantern ring (33) and the lower ring plate (34) are connected with the inclined strut in a welding mode, and the bottom inserting type pile (36) is connected with the lower ring plate (34) in a welding mode.
6. The offshore mono-pile foundation after-installation reinforcing device of claim 1, wherein: the number and the positions of the bottom inserting piles (36) are arranged in one-to-one correspondence with the inclined struts (31).
7. The offshore mono-pile foundation after-installation reinforcing device of claim 1, wherein: and locking mechanisms are arranged on the outer sides of the upper sleeve ring (32), the lower sleeve ring (33) and the single pile (2).
8. The offshore mono-pile foundation after-installation reinforcing device of claim 1, wherein: the lower ring (33) and the lower ring plate (34) are connected by a hinge (35) or a rivet.
9. Method for installing a reinforcement device after the offshore mono-pile foundation according to any of the claims 1 to 8, characterized in that: the method comprises the following steps:
prefabricating a reinforcing tool in a factory, and integrally manufacturing and connecting the inclined strut (31), the upper lantern ring (32), the lower lantern ring (33), the lower ring plate (34) and the inserted pile (36);
driving the anchoring base (37) and inserting the inserted pile (36) into the anchoring base (37);
the split parts of the upper ring (32) are connected to each other, the split parts of the lower ring (33) are connected to each other, and the split parts of the lower ring plate (34) are connected to each other.
10. Installation method according to claim 9, characterised in that a plurality of collars (4) are welded on the surface of the monopile (2) according to the design,
when prefabricating, a hinge (35) is arranged at the split end part of the lower sleeve ring (33) and the lower ring plate (34) in advance, and the hinge (35) is locked after the installation position is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110249563.4A CN112814021A (en) | 2021-03-08 | 2021-03-08 | Post-installation reinforcing device and method for offshore single-pile foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110249563.4A CN112814021A (en) | 2021-03-08 | 2021-03-08 | Post-installation reinforcing device and method for offshore single-pile foundation |
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| Publication Number | Publication Date |
|---|---|
| CN112814021A true CN112814021A (en) | 2021-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110249563.4A Pending CN112814021A (en) | 2021-03-08 | 2021-03-08 | Post-installation reinforcing device and method for offshore single-pile foundation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338277A (en) * | 2021-07-02 | 2021-09-03 | 中建八局第二建设有限公司 | Building structure pile foundation reinforcing apparatus |
| CN113718830A (en) * | 2021-09-16 | 2021-11-30 | 中国华能集团清洁能源技术研究院有限公司 | Offshore wind power foundation with scour prevention function |
-
2021
- 2021-03-08 CN CN202110249563.4A patent/CN112814021A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338277A (en) * | 2021-07-02 | 2021-09-03 | 中建八局第二建设有限公司 | Building structure pile foundation reinforcing apparatus |
| CN113718830A (en) * | 2021-09-16 | 2021-11-30 | 中国华能集团清洁能源技术研究院有限公司 | Offshore wind power foundation with scour prevention function |
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