CN111395341A - Combined annular cylinder type jacket screwing pile foundation and construction method thereof - Google Patents

Combined annular cylinder type jacket screwing pile foundation and construction method thereof Download PDF

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Publication number
CN111395341A
CN111395341A CN202010220167.4A CN202010220167A CN111395341A CN 111395341 A CN111395341 A CN 111395341A CN 202010220167 A CN202010220167 A CN 202010220167A CN 111395341 A CN111395341 A CN 111395341A
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CN
China
Prior art keywords
pile
cylinder
jacket
rotary
foundation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010220167.4A
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Chinese (zh)
Inventor
丁红岩
林毅峰
张浦阳
王武斌
黄宣旭
张权
乐丛欢
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Shanghai East Ocean Engineering Technology Co.,Ltd.
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Shanghai East Ocean Engineering Technology Co ltd
Shanghai Investigation Design and Research Institute Co Ltd SIDRI
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Application filed by Shanghai East Ocean Engineering Technology Co ltd, Shanghai Investigation Design and Research Institute Co Ltd SIDRI filed Critical Shanghai East Ocean Engineering Technology Co ltd
Priority to CN202010220167.4A priority Critical patent/CN111395341A/en
Publication of CN111395341A publication Critical patent/CN111395341A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/22Placing by screwing down
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D13/00Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
    • E02D13/04Guide devices; Guide frames
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/10Deep foundations
    • E02D27/12Pile foundations

Abstract

The invention belongs to the technical field of offshore foundation structures, and discloses a combined annular cylinder type jacket spinning pile foundation and a construction method thereof.A lower part of a jacket is connected with an annular cylinder, the opening of the annular cylinder is downward and is provided with a plurality of uniformly distributed sub-chambers, each sub-chamber is provided with a guide cylinder and a water supply and drainage valve, and a temporary fixing device is arranged around the guide cylinder; the ring cylinder is connected with driving rotary piles through guide cylinder grouting, and a plurality of driving rotary piles are annularly and uniformly distributed by taking the axis of the ring cylinder as a center; the rotary pile comprises a pile body and rotary bearing blades arranged on the outer side of the pile body, and the rotary 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 annular cylinder 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

Combined annular cylinder type jacket screwing pile foundation and construction method thereof
Technical Field
The invention belongs to the technical field of marine foundations, and particularly relates to a multi-leg jacket foundation 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 combined ring-cylinder jacket revolving 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 combined ring cylinder type jacket screwing pile foundation comprises a jacket, wherein a ring cylinder is connected to the lower portion of the jacket, and the axis of the ring cylinder is collinear with the center line of the jacket;
the ring barrel comprises a barrel-shaped structure with an opening at the lower part, which is formed by an outer barrel, an inner barrel and a top cover, a plurality of cabin separation plates are arranged between the outer barrel and the inner barrel, and the cabin separation plates uniformly divide an annular space between the outer barrel and the inner barrel into a plurality of cabins; each subdivision is provided with a guide cylinder, and the guide cylinders are fixed on the top cover; the top cover is provided with a temporary fixing device around the guide cylinder, and is provided with a water supply and drainage valve corresponding to each compartment;
the ring cylinder is connected with driving rotary piles through the guide cylinder in a grouting manner, and the driving rotary piles are uniformly distributed annularly by taking the axis of the ring cylinder as a center; the pile comprises a pile body and a pile body outer side, wherein the pile body outer side is provided with a rotary bearing blade, and the rotary bearing blade is used for being screwed into a foundation.
Furthermore, the jacket comprises a truss structure formed by connecting a plurality of main legs and a plurality of supporting structures, and the number of the main legs is the same as that of the rotary piles; and a water injection hole below the designed water level is reserved on the main leg of the jacket.
Further, the top surface of the guide cylinder is higher than the top cover of the ring cylinder.
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 is used for being inserted into the guide cylinder and connected with the guide cylinder in a grouting mode.
A construction method of the combined annular cylinder type jacket spin pile foundation comprises the following steps:
(1) prefabricating the jacket, the ring barrel and the rotary pile on land, connecting the jacket with the ring barrel, inserting the rotary pile into the guide barrel, and encircling and restraining the rotary pile through the temporary fixing device; 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 water supply and drainage valves of each compartment of each ring cylinder to deflate, so that the integral structure exhausts air and sinks; leveling by controlling each water supply and drainage valve in the sinking process;
(4) after the integral structure sinks to the mud contact surface of the ring 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 guide cylinder by using grouting material to connect the rotary driving pile and the annular cylinder.
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 combined ring cylinder type jacket spinning pile foundation and the construction method thereof, a structural body formed by the spinning pile and the ring 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 spinning pile are reduced, and the piling 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, the compartment of the ring cylinder is utilized for accurate positioning and underwater leveling, the pile guide cylinder arranged on the ring cylinder is used as the piling frame, and the leveling characteristic of the ring cylinder also ensures that the verticality of the pile guide cylinder can be always ensured in the piling process to realize vertical piling, and the levelness of the pile guide frame can be adjusted according to the levelness of the pile body, so that 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 anchor flange of the annular cylinder and the anchor 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 combined annular jacket spin pile foundation according to the present invention;
FIG. 2 is a schematic structural view of a combined annular cylinder type jacket spin pile foundation of the present invention;
FIG. 3 is a schematic structural view of a rotary pile in a combined annular jacket rotary pile foundation according to 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 transportation state of the combined annular-cylinder jacket spin-pile foundation provided by the invention.
In the above figures: 1. a jacket; 11. a main leg; 12. a support structure; 2. a ring cylinder; 21. an outer cylinder; 22. an inner barrel; 23. a guide cylinder; 24. a deck plate; 25. an anchoring flange; 26. a temporary fixing device; 27. 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 fig. 1, the present embodiment discloses a combined annular-cylinder jacket spin pile foundation for offshore wind power, which includes a jacket 1, a large-diameter annular cylinder 2 and a plurality of identical spin piles 3. The axis of a ring cylinder 2 is collinear with the central line of the jacket 1, the jacket 1 is connected with the upper part of the ring cylinder 2, the lower part of the ring cylinder 2 is connected with a rotary pile 3, and a plurality of rotary piles 3 are uniformly distributed annularly by taking the axis of the ring cylinder 2 as the center.
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 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, the ring cylinder 2 mainly includes an outer cylinder 21, an inner cylinder 22, a guide cylinder 23, a subdivision plate 24, and an annular top cover to form a cylinder-in-cylinder structure with an open lower portion. The tops of the inner cylinder 22 and the outer cylinder 21 are respectively welded with the inner edge and the outer edge of the top cover, a plurality of radially and uniformly distributed cabin separation plates 24 are welded between the outer cylinder 21 and the inner cylinder 22, the annular space between the outer cylinder 21 and the inner cylinder 22 is divided into a plurality of cabins by the cabin separation plates 24, and the number of the cabins is generally the same as that of the screwing piles 3. A guide cylinder 23 is arranged in each sub-chamber, the guide cylinder 23 is inserted into the top cover and welded with the top cover, the top surface of the guide cylinder 23 is slightly higher than the top cover, on one hand, the guide cylinder is convenient to position when the rotary pile 3 and the anchoring blade 33 are installed, on the other hand, the guide cylinder is also convenient to be connected and fixed with grouting equipment, and meanwhile, the grouting contact area is increased. The inner diameter of the guide cylinder 23 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 blade 32 or the anchoring blade 33), so that the pile 3 can be smoothly inserted into the guide cylinder 23. The top cover of the ring cylinder 2 is provided with an anchoring flange 25 with a reinforcing structure for connecting with the main leg 11 of the jacket 1 through a high-strength bolt. Around each guide cylinder 23, a temporary fixing device 26 is provided, and the temporary fixing device 26 is mounted on the top cover. Temporary fixing device 26 optional electronic annular cohesion device for will beat in basis preparation and transportation and revolve stake 3 and mention, guarantee to beat and revolve 3 bottoms and imbed all the time inside a ring section of thick bamboo 2, not only in land construction and marine transportation in-process can be better protection bearing bolt blade 32, avoid accidental collision, can guarantee in the stage of sinking moreover that a ring section of thick bamboo 2 contacts the mud face earlier, thereby form and beat the guide pile interface of revolving stake 3. And a water supply and drainage valve 27 is arranged on the top cover of the ring cylinder 2 corresponding to each compartment and is used for realizing the water pumping and pumping operation of each compartment by externally connecting a high-pressure 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 screwing bearing blades 32 corresponding to the height of the soft soil layer in the in-place state of the foundation, and the screwing bearing blades 32 are screwed into the foundation to provide main bearing capacity, so that the length of the pile body 31 can be reduced, and the 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 strengthening the connection of pile 3 to annular cylinder 2. The anchoring blade 33 is made of steel structure, can also be inclined or spiral, has the width of 0.1-10m and the thickness of 5-50mm, is shorter than the guide cylinder 23 of the ring cylinder 2 in height, and is connected with the guide cylinder 23 through grouting.
The jacket main legs 11 of the jacket 1 are connected with the anchoring flanges 23 at the tops of the respective sub-tanks of the ring barrel 2 in a one-to-one correspondence. The rotary bearing blade 32 at the top of the rotary pile 3 is connected with the top of the guide cylinder 23 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 along with the rotation of the pile body 31 to enter the soil, the disturbance to the soil body in the guide cylinder 23 is reduced, and the anchor type reinforced concrete pile is superior to the traditional straight plate type reinforced plate. Meanwhile, the rotation bearing blades 32 increase the contact area with the soil body and the concrete, are superior to the traditional rib type stiffening plates, can enable the guide cylinder 23, the soil body and the pile body 31 to be in tight anchoring connection after grouting, and ensure the load transmission of the jacket 1, the ring cylinder 2 and the rotation driving pile 3.
The construction method of the combined annular cylinder type jacket spin pile foundation specifically comprises the following steps:
(1) prefabrication of the jacket 1, the annular cylinder 2 and the rotary piles 3 is completed on land, the main legs 11 of the jacket 1 are correspondingly connected with the anchoring flanges 25 of the annular cylinder 2 one by one, the rotary piles 3 are inserted into the guide cylinders 23 of the annular cylinder 2, and the temporary fixing devices 26 encircle the restrained rotary piles 3; 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 each sub-chamber of 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 valves 27 of each compartment of the ring cylinder 2 to deflate, so that the whole structure is exhausted and sinks, and the sinking and leveling of the whole structure are realized by controlling the air release amount of the water supply and drainage valves 27 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 devices 26 of the tops of all the sub-cabins of the annular cylinder 2 and the screwing piles 3 are 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 process of piling, the ring barrel 2 plays a role of a pile guide frame, the pile body 31 is limited to move only in each guide barrel 23 of the ring barrel 2, dynamic leveling is realized by adjusting the mud feeding direction of the guide barrels 23, and the pile guide frame does not need to be additionally installed.
(6) After the driving rotary pile 3 enters the mud to set depth (the set depth is designed according to the influence of soil quality), the drainage valve 27 of each compartment is controlled to pump air/pump water to sink the ring cylinder 2, and the ring cylinder 2 sinks slowly and uniformly by utilizing the difference between the internal pressure and the external pressure of each compartment of the ring 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 guide cylinder 23 is ensured, the vertical mud entering of the screwing 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 driving pile 3 are both filled with mud to a specified height and leveled, and performing underwater grouting on the guide cylinder 23 by using grouting material, wherein the grouting material is common cement paste, epoxy cement paste or high-strength grouting material, so that the rotary driving 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 (10)

1. A combined ring cylinder type jacket screwing pile foundation comprises a jacket, and is characterized in that a ring cylinder is connected to the lower portion of the jacket, and the axis of the ring cylinder is collinear with the center line of the jacket;
the ring barrel comprises a barrel-shaped structure with an opening at the lower part, which is formed by an outer barrel, an inner barrel and a top cover, a plurality of cabin separation plates are arranged between the outer barrel and the inner barrel, and the cabin separation plates uniformly divide an annular space between the outer barrel and the inner barrel into a plurality of cabins; each subdivision is provided with a guide cylinder, and the guide cylinders are fixed on the top cover; the top cover is provided with a temporary fixing device around the guide cylinder, and is provided with a water supply and drainage valve corresponding to each compartment;
the ring cylinder is connected with driving rotary piles through the guide cylinder in a grouting manner, and the driving rotary piles are uniformly distributed annularly by taking the axis of the ring cylinder as a center; the pile comprises a pile body and a pile body outer side, wherein the pile body outer side is provided with a rotary bearing blade, and the rotary bearing blade is used for being screwed into a foundation.
2. The combination ring-and-cylinder jacket swivel pile foundation of claim 1, wherein said jacket comprises a truss structure formed by connecting a plurality of main legs and a plurality of support structures, said main legs being the same number as said swivel piles; and a water injection hole below the designed water level is reserved on the main leg of the jacket.
3. The combination ring cylinder jacket swivel pile foundation of claim 1, wherein the top surface of the guide cylinder is higher than the top cover of the ring cylinder.
4. The combination ring cylinder jacket screwing pile foundation of claim 1, wherein a soft soil layer exists on 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-place state.
5. The combination ring cylinder jacket spinning pile foundation of claim 1, wherein a hard soil layer is present at the foundation seating site, and the spinning bearing blades are arranged at the bottom of the spinning pile.
6. The combination ring cylinder jacket spinning pile foundation of claim 1, wherein the spinning 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 °.
7. The combination ring cylinder jacket spinning pile foundation of claim 1, wherein the spinning bearing blades are helical, are uniformly arranged around the axis of the pile body and rotate in the same direction, and have a helix angle of 18-360 °.
8. The combination ring cylinder type jacket screw pile foundation as claimed in claim 7, wherein the top of the pile body of the screw pile is provided with an anchoring blade, and the anchoring blade is used for being inserted into the guide cylinder and connected with the guide cylinder in grouting.
9. A method for constructing a rotary pile foundation of a combined annular cylinder type jacket according to any one of claims 1 to 8, which comprises the following steps:
(1) prefabricating the jacket, the ring barrel and the rotary pile on land, connecting the jacket with the ring barrel, inserting the rotary pile into the guide barrel, and encircling and restraining the rotary pile through the temporary fixing device; 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 water supply and drainage valves of each compartment of each ring cylinder to deflate, so that the integral structure exhausts air and sinks; leveling by controlling each water supply and drainage valve in the sinking process;
(4) after the integral structure sinks to the mud contact surface of the ring 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 guide cylinder by using grouting material to connect the rotary driving pile and the annular cylinder.
10. The method for constructing a rotary pile foundation of a combined annular cylinder type jacket according to claim 9, 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 buoyancy of the jacket.
CN202010220167.4A 2020-03-25 2020-03-25 Combined annular cylinder type jacket screwing pile foundation and construction method thereof Pending CN111395341A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010220167.4A CN111395341A (en) 2020-03-25 2020-03-25 Combined annular cylinder type jacket screwing pile foundation and construction method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010220167.4A CN111395341A (en) 2020-03-25 2020-03-25 Combined annular cylinder type jacket screwing pile foundation and construction method thereof

Publications (1)

Publication Number Publication Date
CN111395341A true CN111395341A (en) 2020-07-10

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Application Number Title Priority Date Filing Date
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