CN111364497B - Offshore leveling multi-leg jacket spin pile foundation and construction method thereof - Google Patents

Offshore leveling multi-leg jacket spin pile foundation and construction method thereof Download PDF

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Publication number
CN111364497B
CN111364497B CN202010220666.3A CN202010220666A CN111364497B CN 111364497 B CN111364497 B CN 111364497B CN 202010220666 A CN202010220666 A CN 202010220666A CN 111364497 B CN111364497 B CN 111364497B
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pile
jacket
foundation
rotary
annular
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CN111364497A (en
Inventor
王武斌
丁红岩
林毅峰
张浦阳
张权
黄宣旭
乐丛欢
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Ding Hongyan
Shanghai East Ocean Engineering Technology Co ltd
Zhang Puyang
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Shanghai East Ocean Engineering Technology Co ltd
Zhang Puyang
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/32Foundations for special purposes
    • E02D27/42Foundations for poles, masts or chimneys
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/10Deep foundations
    • E02D27/12Pile foundations
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/32Foundations for special purposes
    • E02D27/52Submerged foundations, i.e. submerged in open water
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/727Offshore wind turbines

Abstract

The invention belongs to the technical field of offshore foundation structures, and discloses a leveling multi-leg jacket spin pile foundation and a construction method thereof, wherein the lower part of a jacket is connected with a plurality of annular cylinders, and each annular cylinder is provided with a temporary fixing device and a water supply and drainage valve; each annular cylinder is connected with a screwing pile through grouting of an inner cylinder of the annular cylinder, the screwing pile comprises a pile body and screwing bearing blades arranged on the outer side of the pile body, and the screwing bearing blades are used for being screwed into a foundation to provide main bearing capacity. The invention converts the traditional guide frame construction into suction sinking leveling operation, converts the traditional piling construction into rotary pile mud entering operation, and simultaneously utilizes the plurality of annular cylinders to carry out accurate positioning and underwater leveling, thereby increasing the bearing capacity of the foundation, realizing accurate leveling and improving the construction efficiency.

Description

Offshore leveling multi-leg jacket spin pile foundation and construction method thereof
Technical Field
The invention belongs to the technical field of offshore foundations, and particularly relates to a leveling multi-leg jacket foundation on the sea and a construction method thereof.
Background
In the design and use of the offshore multi-pile jacket foundation structure, the pile foundation plays a crucial role, and the load borne by the jacket is transmitted to the seabed through the pile foundation, so that the whole jacket platform is stabilized. The existing multi-pile jacket foundation structure and construction generally take two forms: firstly, driving a steel pipe pile, and then installing a jacket (a pile-first method); the jacket is installed first, and then the steel pipe piles are driven into the guide holes (post-pile method). The two methods have certain requirements on the perpendicularity of the pile body, pile top errors and seabed flatness, and meanwhile, the levelness of the jacket is difficult to control, and the integral structure is difficult to level after inclination. Simultaneously, along with wind-powered electricity generation development gradually moves towards deep open sea, the steel-pipe pile diameter and the degree of depth of many piles jacket basis are constantly increasing, and the degree of difficulty of piling is also constantly increasing.
Disclosure of Invention
The invention aims to solve the technical problems that the pile foundation construction difficulty of the existing multi-pile jacket foundation structure is high and the jacket is easy to incline and difficult to level, and provides a offshore leveling multi-leg jacket pile foundation and a construction method thereof, which can increase the bearing capacity of the foundation, realize accurate leveling and improve the construction efficiency.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a multi-leg jacket spin pile foundation capable of being leveled on the sea comprises a jacket, wherein the lower part of the jacket is connected with a plurality of annular cylinders, each annular cylinder is a cylindrical structure with an opening at the lower part and formed by an outer cylinder, an inner cylinder and a top cover, and the top cover is provided with a temporary fixing device and a water supply and drainage valve;
every annular section of thick bamboo is connected with through a section of thick bamboo grout in it and beats and revolve the stake, it includes pile body and the slope form or the heliciform that the pile body outside set up and beats and revolve the bearing blade, it is used for the screw in ground to beat and revolves the bearing blade.
Further, the jacket comprises a truss structure formed by connecting a plurality of main legs and a plurality of support structures, and the number of the main legs is the same as that of the annular cylinders; and a water injection hole below the designed water level is reserved on the main leg of the jacket.
Further, a soft soil layer exists in the foundation in-place site, and the screwing bearing blades are arranged at the height of the screwing pile corresponding to the position of the soft soil layer in the foundation in the in-place state.
Further, a hard soil layer exists in a foundation in-place site, and the spinning bearing blades are arranged at the bottom of the spinning pile.
Further, the spin bearing blades are inclined, are uniformly arranged around the axis of the pile body, and have the same inclination direction, and the inclination angle is 30-150 degrees.
Further, the spin bearing blades are spiral, are uniformly arranged around the axis of the pile body, and have the same rotating direction and the spiral angle of 18-360 degrees.
Furthermore, an anchoring blade is arranged at the top of the pile body of the rotary driving pile and used for being inserted into the inner cylinder of the annular cylinder and connected with the inner cylinder in a grouting mode.
The construction method of the offshore leveling multi-leg jacket spin pile foundation comprises the following steps:
(1) prefabricating the jacket, the annular cylinders and the rotary piles on land, connecting each annular cylinder with the jacket, inserting the rotary piles into the inner cylinder, and encircling and restraining the rotary piles through the temporary fixing devices; obtaining a land assembled integral structure;
(2) hoisting the integral structure obtained in the step (1) into water, and transporting the integral structure to a specified installation position;
(3) after positioning, opening the water supply and drainage valves of the annular cylinders to deflate, so that the integral structure exhausts air and sinks;
(4) after the integral structure sinks to the mud contact surface of the annular cylinder, the temporary fixing device is released;
(5) piling the rotary pile by adopting piling equipment, wherein the rotary pile automatically rotates downwards to enter the soil under the interaction of the rotary bearing blades and the soil body in the piling process;
(6) after the driven pile is driven into the mud to a set depth, the annular cylinder is pumped out/pumped down;
(7) and (5) repeating the step (5) and the step (6) until the annular cylinder and the rotary driving pile are both filled with mud to a specified height and leveled, and performing underwater grouting on the inner cylinder by using grouting material to connect the rotary driving pile and the annular cylinder.
Further, in the step (3), the leveling of each annular cylinder in the sinking process is realized by controlling the air discharge amount of the drainage valve; and (5) leveling in the sinking process of each annular cylinder is realized by controlling the air suction/water suction amount of the drainage valve.
Further, the jacket is automatically filled with water through a water filling hole located below a design water level in the step (3) to reduce buoyancy of the jacket.
The invention has the beneficial effects that:
according to the offshore leveling multi-leg jacket pile-screwing foundation and the construction method thereof, a structural body formed by the pile-screwing pile and the annular cylinder is used as a bearing structure of the jacket, so that on one hand, the bearing capacity of the foundation on a mud surface is increased by utilizing the top bearing type stress characteristic of the cylinder type foundation, the requirements on the length and the diameter of the pile-screwing pile are reduced, and the pile driving difficulty is indirectly reduced; on the other hand, the bearing characteristic of the single-pile foundation is utilized, and the diameter and the barrel height of the barrel-shaped foundation are reduced. Moreover, the traditional guide frame construction is converted into suction sinking leveling operation, the traditional piling construction is converted into rotary pile mud entering operation, meanwhile, a plurality of annular cylinders are utilized for accurate positioning and underwater leveling, the inner cylinders of the annular cylinders are used as piling frames, and the leveling characteristics of the annular cylinders ensure that the verticality of the inner cylinders can be always ensured in the piling process to realize vertical piling, the levelness of the pile guide frame can be adjusted according to the levelness of a pile body, the dynamic leveling in the piling process is realized, and the construction difficulty is greatly reduced; the bearing area and the bearing capacity of the rotary pile can be improved by the rotary bearing blades of the rotary pile, so that the diameter of a required pile body is reduced, the force transmission between a pile foundation and a jacket is ensured by the anchoring flange of the annular cylinder and the anchoring blades at the top of the pile body, and the rotary pile has the characteristics of convenience in construction, strong stability of the whole structure and the like and has good application prospect.
Drawings
FIG. 1 is a schematic structural view of a multi-leg jacket swivel pile foundation provided by the present invention;
FIG. 2 is a schematic structural view of a ring cylinder in the multi-leg jacket spin pile foundation provided by the present invention;
FIG. 3 is a schematic structural view of a swivel pile in a multi-leg jacket swivel pile foundation provided by the present invention;
FIG. 4 is a schematic structural view of a pitch shaped swirl carrying vane;
FIG. 5 is a schematic structural view of a helical swirl bearing blade;
fig. 6 is a schematic view of the transport state of the multi-leg jacket swivel pile foundation provided by the present invention.
In the above figures: 1. a jacket; 11. a main leg; 12. a support structure; 2. an annular cylinder; 21. an outer cylinder; 22. an inner barrel; 23. an anchoring flange; 24. a temporary fixing device; 25. a water supply and drainage valve; 3. driving a rotary pile; 31. a pile body; 32. rotating the bearing blade; 33. the blade is anchored.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in figure 1, the invention discloses a leveling multi-leg jacket spin pile foundation on the sea, which comprises a jacket 1, a plurality of identical annular cylinders 2 and a plurality of identical spin piles 3. A plurality of the same annular section of thick bamboo 2 can constitute a regular polygon according to its central point line on the horizontal plane and arrange, and jacket 1 is connected jointly to a plurality of annular section of thick bamboo 2 upper portions, and a plurality of annular section of thick bamboo 2 and a plurality of pile 3 one-to-one connections of beating soon.
In this embodiment, the jacket 1 is a truss structure formed by connecting three identical main legs 11 and a plurality of supporting structures 12, the main legs 11 and the supporting structures 12 are both made of round steel pipes, and the diameter of the main legs 11 is usually larger than that of the supporting structures 12. The number of main legs 11 is the same as the number of annular cylinders 2 and of the driven piles 3, typically 3-6. The main legs 11 are reserved with water injection holes, the positions of the water injection holes are set below the designed water level, and the jacket 1 can be automatically injected with water after sinking in place, so that the buoyancy of the jacket 1 is reduced.
As shown in fig. 2, each of the annular cylinders 2 is mainly formed into a cylindrical structure with an open lower part by an outer cylinder 21, an inner cylinder 22 and an annular top cover, and the tops of the outer cylinder 21 and the inner cylinder 22 are welded to the outer edge and the inner edge of the top cover, respectively. The inner diameter of the inner cylinder 22 is larger than the overall extension diameter of the pile 3 (i.e. the sum of the diameter of the pile body 31 and the width of the pile bearing blades 32 or the anchoring blades 33), so that the pile 3 can be smoothly inserted into the inner cylinder 22. The top cover of the annular cylinder 2 is provided with an anchoring flange 23 with a reinforcing structure for connecting with the main legs 11 of the jacket 1 through high-strength bolts. Still be provided with interim fixing device 24 on the top cap of an annular section of thick bamboo 2, the device can select for use electronic annular to hold tightly the device for will beat in basic preparation and transportation and revolve stake 3 and mention, guarantee to beat and revolve 3 bottoms of stake imbed annular section of thick bamboo 2 inside all the time, not only in land construction and marine transportation can be better the protection beat and revolve bearing blade 32, avoid accidental collision, can guarantee annular section of thick bamboo 2 earlier contact mud face in the stage of sinking moreover, thereby form and beat the guide pile interface of revolving stake 3. And a water supply and drainage valve 25 is arranged on the top cover of the annular cylinder 2 and is used for realizing water pumping and water pumping operation by externally connecting a high-pressure water pumping and drainage pump.
As shown in fig. 3, the pile 3 includes a pile body 31 and a rotation-supporting blade 32, and the rotation-supporting blade 32 may have a slanted shape or a spiral shape for screwing into the ground. The pile body 31 is made of steel materials, and the mud penetration depth is 10-100 m. The rotation bearing blades 32 are arranged at different heights outside the pile body 31 according to soil conditions of different foundation in-place sites, and one layer or multiple layers of rotation bearing blades 32 can be arranged. The blade assembly width of the rotation bearing blade 32 can be changed along the height direction according to the soil body strength and pile body stress of different soil layers, the blade assembly width at the weak position of the soil body is wider, and the blade assembly width at the strong position of the soil body is narrower.
If a soft soil layer exists in a foundation in-place site, in general, the pile body 31 is provided with the rotation bearing blades 32 corresponding to the height of the soft soil layer in the in-place state of the foundation, and the rotation bearing blades 32 provide main bearing capacity after being screwed into the foundation, so that the length of the pile body 31 can be reduced, and construction is convenient. The soft soil layer referred to in the present invention includes, but is not limited to, cohesive soil layer in soft plastic/fluid plastic state, sand soil layer in loose state, untreated filling soil and other high compressibility soil layer. If there is a hard soil layer with high strength which is difficult to pile in the site where the foundation is in place, in general, the bottom of the pile body 31 is provided with the screwing bearing blade 32, the bottom of the pile body 31 is located at the top of the hard soil layer after the foundation is in place, the screwing bearing blade 32 provides main bearing capacity, the pile body 31 does not need to be inserted into the hard soil layer, excavation construction is not needed, meanwhile, the length of the pile body 31 is reduced, and construction is convenient. Hard earth layers to which the present invention refers include, but are not limited to, rock layers, coarse gravel layers, crushed rock layers.
As shown in fig. 4, the inclined spin bearing blades 32 are provided in plurality, and are uniformly arranged around the axis of the pile body 31 and have the same inclination direction; the inclined rotary bearing blade 32 has simple processing and blanking, high processing speed and short manufacturing period. Preferably, each inclined swirl bearing blade 32 is a planar sheet structure, the inner side of which is welded to the surface of the pile body 31 in a fitting manner, and the outer side of which is parallel to the intersecting line of the inner side and the pile body 31, so as to ensure that the swirl bearing blades 32 have the same width along the way. Preferably, the number of the inclined rotary bearing blades 32 is 2-20, the inclination angle is 30-150 degrees, the width is 0.1-10m, and the thickness is 1-200 mm. More preferably, the inclination angle of the inclined swirling bearing blade 32 is 45-135 degrees, and the inclination angle in the range can better form an interaction mode with the soil body, so that the swirling bearing blade 32 is ensured to be more beneficial to shearing the soil body.
As shown in fig. 5, the helical whirl-bearing blades 32 include at least one, which are uniformly arranged around the axis of the pile body 31 and have the same rotation direction; the spiral screwing bearing blade 32 can effectively reduce the sinking resistance of the screwing pile 3 and reduce the hammering energy and times in the screwing process. Preferably, the number of the spiral whirl-stop bearing blades 32 is 1-20, the spiral angle is 18-360 degrees, the width is 0.1-10m, and the thickness is 1-200 mm. More preferably, the spiral angle of the spiral rotation bearing blade 32 is 45-135 degrees, and the inclination angle in the range can better form an interaction mode with the soil body, so that the rotation bearing blade 32 is more beneficial to shearing the soil body.
The pile-driving rotary pile 3 adopts general pile-driving equipment for driving, the rotary pile 3 automatically rotates downwards to enter a mud surface under the interaction of the rotary bearing blades 32 and a soil body, and the rotary bearing blades 32 with larger cross-sectional areas provide main bearing capacity for the foundation after being in place.
The outside of the top of shaft 31 may also be arranged with anchoring blades 33 for reinforcing the connection of pile 3 to annular cylinder 2. The anchoring blades 33 are made of steel structures, can also be inclined or spiral, have the width of 0.1-10m and the thickness of 5-50mm, are smaller than the annular cylinder 2 in height, and are connected with the inner cylinder 22 of the annular cylinder 2 through grouting.
The jacket main legs 11 of the jacket 1 are connected to the annular cylinders 2 in a one-to-one correspondence by means of anchoring flanges 23. The anchoring blade 33 at the top of the driving rotary pile 3 is connected with the top of the inner cylinder 22 of the annular cylinder 2 in a grouting mode, and the grouting material is common cement paste, epoxy cement paste or high-strength grouting material. The anchoring blades 33 which are inclined or rotate in the same direction as the rotation bearing blades 32 are adopted, so that the anchoring blades 33 can rotate to enter the soil in the same direction when the pile body 31 rotates, the disturbance to the soil body in the inner barrel 22 is reduced, and the anchor type reinforced concrete pile is superior to the traditional straight plate type reinforced concrete plate. Meanwhile, the anchoring blades 33 also increase the contact area with the soil body and the concrete, are superior to the traditional rib type stiffening plates, can enable the inner cylinder 22, the soil body and the pile body 31 to be in tight anchoring connection after grouting, and ensure the load transfer of the jacket 1, the annular cylinder 2 and the screwing pile 3.
The construction method of the offshore leveling multi-leg jacket spin pile foundation comprises the following steps:
(1) prefabrication of the jacket 1, the annular cylinders 2 and the driven piles 3 is completed on land, the main legs 11 of the jacket 1 are connected with the anchoring flanges 23 of the annular cylinders 2, the driven piles 3 are inserted into the inner cylinders 22 of the annular cylinders 2, and the driven piles 3 are encircled and restrained by the temporary fixing devices 24; a land-based assembled integral structure is obtained, as shown in fig. 6.
(2) Hoisting the integral structure obtained in the step (1) into water, inflating the annular cylinder 2 to realize free floating of the integral structure, and after checking the air tightness, floating and transporting the integral structure to a specified installation position. In addition to floating, floating cranes, barges, etc. may be used to transport the overall structure to the installation site and to achieve precise positioning using the mooring system.
(3) After positioning, opening the water supply and drainage valve 25 of the annular cylinder 2 to deflate, so that the whole structure is exhausted and sinks, and realizing slow and uniform sinking of the whole structure by controlling the air bleeding amount of the drainage valve 25 in the sinking process; and (3) synchronously, water can be injected into the guide pipe frame 1 so as to reduce the buoyancy of the guide pipe frame 1.
(4) After the integral structure sinks to the mud contact surface of the annular cylinder 2, the temporary fixing device 24 between the top of the annular cylinder 2 and the screwing pile 3 is released;
(5) piling the rotary pile 3 by using pile hammer equipment; during the piling process, the pile body 31 automatically rotates downwards into the foundation under the interaction of the rotating bearing blades 32 and the soil body. The rotary bearing blade 32 has a certain shearing effect on the foundation, the rotary bearing blade 32 rotates along with hammering, a certain disturbance effect is generated on the soil around the foundation of the rotary pile 3, the strength of the surrounding soil is weakened, and the rotary pile 3 gradually transfers into the foundation under the hammering effect of the pile hammer and the torsion of the rotary bearing blade 32. In the piling process, the ring cylinder 2 plays a role of a pile guide frame to limit the pile body 31 to move only in the inner cylinder 22, and dynamic leveling is realized by adjusting the mud feeding direction of the inner cylinder 22 without additionally installing the pile guide frame.
(6) After the driving rotary pile 3 enters the mud to set depth (the set depth is designed according to the influence of soil texture), the annular cylinder 2 is pumped/pumped and sinks, and the sinking of each annular cylinder 2 is realized by utilizing the difference between the internal pressure and the external pressure of the annular cylinder 2. In the operation process, the leveling of each annular cylinder 2 in the sinking process is ensured by controlling the air pumping/water pumping amount, the verticality of the inner cylinder 22 is ensured, the vertical mud entering of the rotary pile 3 is facilitated, and the levelness of the upper jacket 1 is ensured.
(7) And (5) repeating the step (5) and the step (6) until the annular cylinder 2 and the rotary pile 3 are both filled with mud to a specified height and leveled, and then performing underwater grouting on the inner cylinder 22 by using grouting material, wherein the grouting material is common cement paste, epoxy cement paste or high-strength grouting material, so that the rotary pile 3 and the annular cylinder 2 are tightly connected, and finally completing construction.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make various changes and modifications within the spirit and scope of the present invention without departing from the spirit and scope of the appended claims.

Claims (7)

1. A multi-leg jacket spin pile foundation capable of being leveled on the sea comprises a jacket and is characterized in that the lower portion of the jacket is connected with a plurality of annular cylinders, each annular cylinder is of a cylindrical structure with an opening at the lower portion and formed by an outer cylinder, an inner cylinder and a top cover, and the top cover is provided with a temporary fixing device and a water supply and drainage valve;
each annular cylinder is connected with a driving rotary pile through grouting of an inner cylinder of the annular cylinder; the rotary pile comprises a pile body and rotary bearing blades arranged on the outer side of the pile body; the rotation bearing blades are inclined and are uniformly arranged around the axis of the pile body, and the inclination directions of the rotation bearing blades are consistent; or the rotation bearing blades are spiral and are uniformly arranged around the axis of the pile body, and the rotation directions of the rotation bearing blades are consistent; in the piling process, the pile body automatically rotates downwards to enter a foundation under the interaction of the rotary bearing blades and the soil body; the swirling bearing blade can be provided with one layer or a plurality of layers; the top of the pile body is provided with an anchoring blade which is inserted into the inner cylinder, the anchoring blade is connected with the inner cylinder in a grouting way, and the anchoring blade is inclined or spiral in the same inclination or rotation direction with the rotation bearing blade;
if a soft soil layer exists in the foundation in-place site, arranging the screwing bearing blades at the height of the screwing pile corresponding to the position of the soft soil layer in the foundation in-place state;
and if a hard soil layer exists in the foundation in-place site, arranging the spinning bearing blades at the bottom of the spinning pile.
2. The offshore levelable multi-leg jacket spin pile foundation of claim 1, wherein said jacket comprises a truss structure of a plurality of main legs and a plurality of support structures, said main legs being the same number as said toroids; and a water injection hole below the designed water level is reserved on the main leg of the jacket.
3. The offshore levelable multi-leg jacket spin pile foundation of claim 1, wherein the pitch angle of the spin bearing blades is 30 to 150 ° when they are tilted.
4. The offshore levelable multi-leg jacket spin pile foundation of claim 1, wherein the spin bearing blades have a helical angle of 18 to 360 ° when they are helical.
5. A method of constructing a rotary pile foundation for offshore levelable multi-leg jacket according to any one of claims 1 to 4, comprising the steps of:
(1) prefabricating the jacket, the annular cylinders and the rotary piles on land, connecting each annular cylinder with the jacket, inserting the rotary piles into the inner cylinder, and encircling and restraining the rotary piles through the temporary fixing devices; obtaining a land assembled integral structure;
(2) hoisting the integral structure obtained in the step (1) into water, and transporting the integral structure to a specified installation position;
(3) after positioning, opening the water supply and drainage valves of the annular cylinders to deflate, so that the integral structure exhausts air and sinks;
(4) after the integral structure sinks to the mud contact surface of the annular cylinder, the temporary fixing device is released;
(5) piling the rotary pile by adopting piling equipment, wherein the rotary pile automatically rotates downwards to enter the soil under the interaction of the rotary bearing blades and the soil body in the piling process;
(6) after the driven pile is driven into the mud to a set depth, the annular cylinder is pumped out/pumped down;
(7) and (5) repeating the step (5) and the step (6) until the annular cylinder and the rotary driving pile are both filled with mud to a specified height and leveled, and performing underwater grouting on the inner cylinder by using grouting material to connect the rotary driving pile and the annular cylinder.
6. The method for constructing the offshore levelable multi-leg jacket spinning pile foundation according to claim 5, wherein the leveling in the sinking process of each ring cylinder is realized by controlling the air relief amount of the drainage valve in the step (3); and (5) leveling in the sinking process of each annular cylinder is realized by controlling the air suction/water suction amount of the drainage valve.
7. The method for constructing the offshore levelable multi-leg jacket spinning pile foundation according to claim 5, wherein the jacket is automatically filled with water through a water filling hole located below a design water level in the step (3) to reduce the buoyancy of the jacket.
CN202010220666.3A 2020-03-25 2020-03-25 Offshore leveling multi-leg jacket spin pile foundation and construction method thereof Active CN111364497B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6665990B1 (en) * 2000-03-06 2003-12-23 Barr Engineering Co. High-tension high-compression foundation for tower structures
CN102296623A (en) * 2011-06-27 2011-12-28 天津大学 Tripod type leveling offshore foundation structure and construction method thereof
DE102012021001A1 (en) * 2012-04-10 2013-10-10 N.Prior Energy Gmbh Method and device for producing a foundation for offshore wind turbines
CN110374131A (en) * 2019-07-19 2019-10-25 浙江大学 A kind of cylinder composite truss formula offshore wind turbine foundation and its construction technology
CN110747882A (en) * 2019-10-14 2020-02-04 中国海洋大学 Nail type anti-sinking plate for ocean engineering, jacket and construction method
CN110761286A (en) * 2019-10-22 2020-02-07 浙江华蕴海洋工程技术服务有限公司 Negative pressure cylinder type pile-first method jacket piling positioning guide device and working method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6665990B1 (en) * 2000-03-06 2003-12-23 Barr Engineering Co. High-tension high-compression foundation for tower structures
CN102296623A (en) * 2011-06-27 2011-12-28 天津大学 Tripod type leveling offshore foundation structure and construction method thereof
DE102012021001A1 (en) * 2012-04-10 2013-10-10 N.Prior Energy Gmbh Method and device for producing a foundation for offshore wind turbines
CN110374131A (en) * 2019-07-19 2019-10-25 浙江大学 A kind of cylinder composite truss formula offshore wind turbine foundation and its construction technology
CN110747882A (en) * 2019-10-14 2020-02-04 中国海洋大学 Nail type anti-sinking plate for ocean engineering, jacket and construction method
CN110761286A (en) * 2019-10-22 2020-02-07 浙江华蕴海洋工程技术服务有限公司 Negative pressure cylinder type pile-first method jacket piling positioning guide device and working method

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