CN112627223A - Double-shell single-pile foundation and installation method thereof - Google Patents
Double-shell single-pile foundation and installation method thereof Download PDFInfo
- Publication number
- CN112627223A CN112627223A CN202011515363.0A CN202011515363A CN112627223A CN 112627223 A CN112627223 A CN 112627223A CN 202011515363 A CN202011515363 A CN 202011515363A CN 112627223 A CN112627223 A CN 112627223A
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- shell
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- pile foundation
- pile
- inner shell
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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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/08—Sinking workpieces into water or soil inasmuch as not provided for elsewhere
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
- E02D27/525—Submerged foundations, i.e. submerged in open water using elements penetrating the underwater ground
Abstract
The invention relates to the technical field of offshore wind power engineering, and discloses a double-shell single-pile foundation and an installation method thereof, wherein the double-shell single-pile foundation comprises an inner shell, an outer shell sleeved outside the inner shell and a longitudinal connecting plate arranged between the inner shell and the outer shell, a top sealing plate is arranged between the inner side wall of the outer shell and the outer side wall of the inner shell, the lower end of the inner shell extends out from an opening at the lower end of the outer shell, and a bottom sealing plate is arranged between an opening at the lower end of the outer shell and the outer side wall of the inner shell. The application range of the single pile foundation technical scheme is expanded.
Description
Technical Field
The invention relates to the technical field of offshore wind power engineering, in particular to a double-shell single-pile foundation and an installation method thereof.
Background
The single-pile foundation is used as a foundation form which is most widely adopted in the field of offshore wind power. At present, in a wind field in a shallow water area, a fixed single-pile fan foundation form is mainly used. Because the single pile has the characteristics of convenience in offshore installation, short installation period, low installation cost and the like, more and more projects are now used for pushing the single pile to the water depth of more than 30m, even 40 m. The single piles in the deep water areas have large wall thickness, large diameter and large self weight, so the problems that the wall thickness is large, the requirement on welding is higher, and the welding difficulty is higher are caused; secondly, the large diameter leads to insufficient lifting height and transportation capacity of a plurality of processing workshops, and further sufficient productivity cannot be obtained; thirdly, after the water depth of the single-wall single pile is increased, the single-wall single pile is limited by the wall thickness, and the self rigidity sometimes cannot meet the running requirement of the fan; finally, due to the fact that the self-weight is large, the single pile is an open pile, the area of the pile end is small, the problem that the single pile with the super-large diameter faces the greatest number is the problem that self-sinking is too large and the pile slips off during offshore construction, and the problem brings great troubles and great risks to the quality of offshore construction.
Disclosure of Invention
In view of the above, the invention aims to provide a double-shell single-pile foundation, so as to solve the problems that the existing single-pile foundation is large in wall thickness, higher in welding requirement and higher in welding difficulty; secondly, the large diameter leads to insufficient lifting height and transportation capacity of a plurality of processing workshops, and further sufficient productivity cannot be obtained; finally, the self weight is high, and meanwhile, the single pile is an open pile, so that the problem that the single pile with the super-large diameter faces the most is the pile slipping problem in offshore construction, and the technical problem of great risk is brought to offshore construction.
In order to solve the technical problem, the invention provides a double-shell single-pile foundation which comprises an inner shell, an outer shell sleeved outside the inner shell and a longitudinal connecting plate arranged between the inner shell and the outer shell, wherein a top sealing plate is arranged between the inner side wall of the outer shell and the outer side wall of the inner shell, the lower end of the inner shell extends out of an opening at the lower end of the outer shell, a bottom sealing plate is arranged between the opening at the lower end of the outer shell and the outer side wall of the inner shell, and the inner shell, the outer shell, the top sealing plate and the bottom sealing plate are enclosed to form a closed buoyancy space.
Optionally, a flange is arranged at the upper end of the top sealing plate.
Optionally, a fabrication hole is arranged on the longitudinal connecting plate.
Optionally, a first lifting lug is arranged on the outer side wall of the outer shell, and a second lifting lug is arranged on the outer side wall of the part of the inner shell extending out of the outer shell.
Optionally, the top sealing plate and the bottom sealing plate are both conical sealing plates.
Optionally, the wall thickness of the inner shell extending beyond the outer shell portion is 0.7 times the wall thickness of the inner shell sleeve and the inner portion of the outer shell.
Compared with the prior art, the double-shell single-pile foundation provided by the embodiment of the invention has the beneficial effects that:
according to the double-shell single-pile foundation provided by the embodiment of the invention, the end area of the single pile is changed by adjusting the distance between the inner shell and the outer shell, so that the phenomena of over-large self-sinking and pile slipping of the single pile can be effectively avoided at a soft seabed site mainly comprising clay, and meanwhile, the traditional single pile is upgraded into a double-shell single-pile structure, so that the bending rigidity of the section of the single-pile structure is higher, and the self-vibration frequency of the whole structure is ensured to meet the requirements of fan manufacturers.
A method for installing a double-shell single-pile foundation is applied to the double-shell single-pile foundation and comprises the following steps: installing a plurality of buoyancy devices in a cavity of an inner shell of the double-shell single-pile foundation, wherein the plurality of buoyancy devices are connected in series through a rope, so that the double-shell single-pile foundation horizontally floats on the water surface, and the double-shell single-pile foundation is pulled to be close to a guide frame by using a boat; respectively connecting slings of a crane ship to a first lifting lug of the double-shell single-pile foundation and a second lifting lug of the double-shell single-pile foundation; lifting the rope at the first lifting lug to enable the double-shell single-pile foundation to be inclined and erected in the water slowly; and after the double-shell single-pile foundation is erected, removing the buoyancy device, and adjusting the position of the double-shell single-pile foundation by using a crane to sink the double-shell single-pile foundation into a guide frame, so that the self-sinking of the double-shell single-pile foundation is completed.
Optionally, the buoyancy device is a buoyancy bladder or a cylindrical buoyancy tank.
Compared with the prior art, the installation method of the double-shell single-pile foundation has the beneficial effects that:
according to the installation method of the double-shell single-pile foundation provided by the embodiment of the invention, by means of buoyancy of the buoyancy space of the double-shell single-pile foundation and the installation of the plurality of buoyancy devices in the inner shell cavity, the double-shell single-pile foundation can be pulled by using a small ship, compared with a traditional single-pile installation mode, a large-scale transport ship is saved, the requirement on a hoisting ship is reduced, and the double-shell single-pile foundation has a larger end area, so that the problem of pile slipping is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a double-shell single-pile foundation according to an embodiment of the invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a first schematic state diagram of a method for installing a double-shell single-pile foundation according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a second state of the method for installing a double-shell single-pile foundation according to the embodiment of the invention;
fig. 5 is a schematic state diagram three of the method for installing the double-shell single-pile foundation according to the embodiment of the invention.
In the figure, the buoyancy device comprises a base plate, a longitudinal connecting plate, a top sealing plate, a bottom sealing plate, a fabrication hole, a first lifting lug, a second lifting lug, a buoyancy device and a connecting plate, wherein the longitudinal connecting plate is 1, the inner shell is 2, the outer shell is 3, the longitudinal connecting plate is 4, the top sealing plate is 5, the bottom sealing plate is 6.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In addition, the following description will be briefly made with reference to the orientation: the following directional or positional relationships, as indicated in the context of "front", "rear", "upper", "lower", "left", "right", etc., with respect to each structural member, are intended to refer to the orientation or positional relationship as shown in the drawings; these positional relationships are merely for convenience and simplicity of description and do not indicate or imply that the device referred to must have a particular orientation, be constructed and operated in a particular orientation and therefore should not be construed as limiting the invention.
If there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1-2, a double-shell single-pile foundation according to a preferred embodiment of the present invention includes an inner shell 1, an outer shell 2 sleeved outside the inner shell 1, and a longitudinal connecting plate 3 disposed between the inner shell 1 and the outer shell 2, wherein a top sealing plate 4 is disposed between an inner side wall of the outer shell 2 and an outer side wall of the inner shell 1, a lower end of the inner shell 1 extends out from an opening at a lower end of the outer shell 2, a bottom sealing plate 5 is disposed between a lower end opening of the outer shell 2 and an outer side wall of the inner shell 1, and the inner shell 1, the outer shell 2, the top sealing plate 4, and the bottom sealing plate 5 enclose to form a closed buoyancy space.
Based on above-mentioned technical scheme, in this embodiment, through the single pile foundation of bivalve design for the very big improvement of single pile foundation of traditional single shell structural strength on single pile foundation to set up longitudinal tie between inner shell and the shell, further strengthened the joint strength between inner shell and the shell, and then promoted the holistic structural strength on single pile foundation, improve the utilization ratio of thick board, improve the anti local buckling ability of steel sheet, so can reduce thick, optimize the foundation engineering volume.
Further, the interval sets up between inner shell and the shell, through 5 sealing connection of bottom sealing board between the lower extreme opening of shell 2 and the lateral wall of inner shell 1, has great tip area, avoids taking place the risk of swift current stake in soft soil site, improves the security of whole construction.
Specifically, the inner shell extends uniformly from the top to the pile end at a position about 3m away from the flange. The casing extends from the flange to a specific soil layer location. The specific soil layer position refers to a soil layer with certain bearing capacity, which is obtained according to geological survey parameters and pile driving analysis, a space between the inner shell and the outer shell, the inclination angle of the conical plate and the supporting area of the end part are obtained according to geological conditions and pile driving analysis, and in the pile driving process, resistance can be increased through the bottom sealing plate, so that the risk of pile slipping at a soft soil site is avoided, and the safety of the whole construction is improved.
The upper end of the top sealing plate 4 is provided with a flange, and the flange is convenient for installing a mounting seat so as to be matched with a pile driving hammer for working.
The longitudinal connecting plate 3 is provided with the fabrication holes 6, the fabrication holes are lightening holes, the self weight of the single pile is further reduced, and the number of the fabrication holes can be set according to construction requirements.
The outer side wall of the outer shell 2 is provided with a first lifting lug 7, the outer side wall of the part of the inner shell 1 extending out of the outer shell 2 is provided with a second lifting lug 8, and the lifting lug is convenient to be connected with a sling of a crane ship in a matching mode.
The top shrouding 4 with bottom shrouding 5 is the circular cone shrouding, plays the effect of sealing up the clearance between inner shell and the shell.
The wall thickness of the part, extending out of the outer shell 2, of the inner shell 1 is 0.7 times of the wall thickness of the part, sleeved with the inner shell 1, of the outer shell 2, so that the aim of optimizing the weight of the single pile is fulfilled.
As shown in fig. 3-5, a method for installing a double-shell single-pile foundation is applied to the double-shell single-pile foundation, and comprises the following steps of installing a plurality of buoyancy devices 9 in a cavity of an inner shell 1 of the double-shell single-pile foundation, connecting the plurality of buoyancy devices 9 in series through a rope, fixedly connecting the buoyancy devices in the cavity of the inner shell, namely, the buoyancy devices cannot slide out from the bottom of the single pile and can only be taken out from the top of the single pile, enabling the double-shell single-pile foundation to transversely suspend on the water surface, and using a boat to pull the double-shell single-pile foundation to the vicinity of a guide frame;
the buoyancy provided in the double-shell is only needed to be utilized without transporting ships, and two (or more) buoyancy devices are arranged in the inner wall pipe cavity of the inner shell. The buoyancy devices are directly connected in series by using ropes, and the ropes at two ends of the series connection sequence of the buoyancy devices are fixed at the bottom ends of the flanges and the piles. The fixed position of the pile bottom adopts a self-loosening mode to fix, and the double-shell single pile can be pulled by using a boat, so that the purpose of saving a transport ship is achieved.
Respectively connecting slings of a crane ship to a first lifting lug 7 of the double-shell single-pile foundation and a second lifting lug 8 of the double-shell single-pile foundation, and preparing to lift a single pile to complete a vertical state;
lifting the rope at the first lifting lug 7 to enable the double-shell single-pile foundation to be inclined and erected in the water slowly;
after the double-shell single-pile foundation is erected, when the single pile is erected slowly, the buoyancy device can stay near the water surface due to the buoyancy effect, the buoyancy device 9 is removed, and the buoyancy device can be taken out through exhausting the gas of the buoyancy device, or moving out the buoyancy device through a small crane, or after the single pile is fed into the guide frame. And at the moment, the weight of the single pile is offset by the lifting hook and the buoyancy of the cavity, and the position of the double-shell single-pile foundation is adjusted by using a crane, so that the double-shell single-pile foundation is sunk into the guide frame, and the self-sinking of the double-shell single-pile foundation is completed.
After the single pile is erected, the single pile is slowly fed into the guide frame to complete the self-sinking of the pile foundation. Because the single pile is mainly applied to the soft foundation site, the effective bearing capacity of the end part of the double-shell structure is more than 5 times of that of the single shell, and the double-shell structure has certain buoyancy, the self-sinking capacity of the single pile can be ensured not to be overlarge, and the bearing capacity of the end part of the double shell can effectively avoid pile slipping in the piling process and ensure that the pile body is smoothly driven into a target position.
Based on above-mentioned technical scheme, through adjusting the interval between bivalve major diameter single pile inner shell and the shell to make super large diameter single pile self possess the buoyancy characteristic, the transportation can adopt major diameter single pile from the superficial mode, lift by crane at sea through the floating crane make its vertical can, vertical back, the opening part through the inner shell both ends is gone into water, lets water slowly flow into the cavity, slowly reduces buoyancy, feeds a stake operation.
The buoyancy device 9 is a buoyancy air bag or a cylindrical buoyancy tank, and preferably, an electric control buoyancy air bag or a buoyancy tank can be used, so that the operation and the recovery are convenient.
In summary, the embodiment of the invention provides a double-shell single-pile foundation which can be towed by a small boat by means of buoyancy of a buoyancy space of the double-shell single-pile foundation, a plurality of buoyancy devices are arranged in an inner shell cavity, compared with a traditional single-pile installation mode, large transport ships are saved, and requirements on hoisting ships are reduced, the double-shell single-pile foundation has a larger end area, so that the problem of pile slipping is avoided, single piles are popularized to deep-sea soft soil area sites, pile slipping can be avoided, and due to the fact that a double-shell structure has buoyancy, piles are turned over in water during installation, and the hoisting height of a crane is reduced by at least 25 m.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a bivalve single pile basis, its characterized in that includes inner shell (1), the cover is located shell (2) in the inner shell (1) outside and set up in inner shell (1) with longitudinal tie plate (3) between shell (2), shell (2) inside wall with be provided with top shrouding (4) between the lateral wall of inner shell (1), the lower extreme of inner shell (1) is followed the opening part of the lower extreme of shell (2) stretches out, the lower extreme opening of shell (2) with be provided with end shrouding (5) between the lateral wall of inner shell (1), inner shell (1) shell (2) top shrouding (4) with end shrouding (5) enclose and close and form inclosed buoyancy space.
2. A double shell single pile foundation as claimed in claim 1 wherein the top closure plate (4) is flanged at its upper end.
3. Double shell mono pile foundation according to claim 1, characterised in that the longitudinal connection plate (3) is provided with an embossed hole (6).
4. A double-shell single-pile foundation as claimed in claim 1, characterised in that the outer side wall of the outer shell (2) is provided with a first lifting lug (7), and the outer side wall of the part of the inner shell (1) extending out of the outer shell (2) is provided with a second lifting lug (8).
5. A double shell single pile foundation as claimed in claim 1 wherein the top closure plate (4) and the bottom closure plate (5) are conical closure plates.
6. A twin-shell monopile foundation as claimed in claim 1, characterised in that the wall thickness of the part of the inner shell (1) extending beyond the outer shell (2) is 0.7 times the wall thickness of the part of the inner shell (1) which is nested with the part of the outer shell (2).
7. A method for installing a double-shell single-pile foundation, which is applied to the double-shell single-pile foundation as claimed in any one of claims 1 to 6, comprising the steps of:
a plurality of buoyancy devices (9) are installed in a cavity of an inner shell (1) of the double-shell single-pile foundation, the buoyancy devices (9) are connected in series through a rope, the double-shell single-pile foundation is enabled to transversely suspend on the water surface, and a boat is used for drawing the double-shell single-pile foundation to be close to a guide frame;
respectively connecting slings of a crane ship to a first lifting lug (7) of the double-shell single-pile foundation and a second lifting lug (8) of the double-shell single-pile foundation;
lifting the rope at the first lifting lug (7) to enable the double-shell single-pile foundation to be inclined and erected slowly in water;
after the double-shell single-pile foundation is erected, the buoyancy device (9) is removed, a crane is used for adjusting the position of the double-shell single-pile foundation, the double-shell single-pile foundation is sunk into a guide frame, and self-sinking of the double-shell single-pile foundation is completed.
8. A method of installing a double shell mono pile foundation as claimed in claim 7 wherein the buoyancy means (9) is a buoyancy bladder or a cylindrical buoyancy tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011515363.0A CN112627223A (en) | 2020-12-18 | 2020-12-18 | Double-shell single-pile foundation and installation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011515363.0A CN112627223A (en) | 2020-12-18 | 2020-12-18 | Double-shell single-pile foundation and installation method thereof |
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| CN112627223A true CN112627223A (en) | 2021-04-09 |
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| CN202011515363.0A Pending CN112627223A (en) | 2020-12-18 | 2020-12-18 | Double-shell single-pile foundation and installation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115807441A (en) * | 2022-12-07 | 2023-03-17 | 中国能源建设集团广东省电力设计研究院有限公司 | Single pile foundation |
| CN116220114A (en) * | 2022-12-15 | 2023-06-06 | 中国铁路设计集团有限公司 | Device for testing vertical bearing capacity of water pile foundation |
| WO2023198824A1 (en) * | 2022-04-13 | 2023-10-19 | Itrec B.V. | Method for installation of an offshore wind turbine foundation monopile |
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| CN208235560U (en) * | 2018-05-18 | 2018-12-14 | 龙源（北京）风电工程设计咨询有限公司 | A kind of offshore wind turbine single-pile foundation being internally provided with floating drum |
| CN110185057A (en) * | 2019-05-14 | 2019-08-30 | 中交第一航务工程局有限公司 | A kind of tooling and construction method for the lifting staking out of offshore wind farm single-pile foundation steel-pipe pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20210409 |