CN114319412A - Single-pile foundation supported by inclined piles and construction method thereof - Google Patents
Single-pile foundation supported by inclined piles and construction method thereof Download PDFInfo
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- CN114319412A CN114319412A CN202111024991.3A CN202111024991A CN114319412A CN 114319412 A CN114319412 A CN 114319412A CN 202111024991 A CN202111024991 A CN 202111024991A CN 114319412 A CN114319412 A CN 114319412A
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Abstract
The invention discloses a single-pile foundation supported by inclined piles and a construction method thereof. The major diameter single pile and 6 batter piles are circular tubular piles, and 6 batter piles are evenly arranged along the cushion cap at 60-degree intervals. The bearing platform is of a cast-in-place reinforced concrete structure and is used for connecting and fixing the large-diameter single pile and the 6 inclined piles. The supporting device is used for further enhancing the connection between the large-diameter single pile and the inclined pile and mainly comprises a large-diameter single pile casing pipe, an inclined pile casing pipe, a single pile hinge, an inclined pile hinge and a rigid connecting rod. After the large-diameter single pile and the inclined pile are sunk, pile body sleeves are sleeved along the pile bodies, the large-diameter single pile and the inclined pile are respectively provided with an annular supporting platform which plays a role of a limiting supporting device, then high-strength grouting material is injected into a gap between the inner wall of the sleeve and the pile to ensure that the sleeves are firmly bonded, and the single pile hinges and the inclined pile hinges are hinged and connected in a one-to-one corresponding mode through rigid connecting rods. And finally, laying bearing platform reinforcing steel bars, and pouring bearing platform concrete in two layers.
Description
Technical Field
The invention belongs to the technical field of offshore pile foundations, and particularly relates to a single-pile foundation supported by inclined piles and a construction method thereof.
Background
The Fujian sea area covering layer is thin, the driving depth of the offshore wind power single pile is limited, the pile body is often embedded into a rock stratum to meet the requirement of bearing capacity, the offshore construction cost is huge, and the construction risk is extremely high. During the piling of embedded rock (embedding weathered rock), if high-strength rock is met, the continuous penetration is easy to fail. In addition, as for the non-rock-socketed single pile, due to complex geological conditions, even in a common soil layer, adverse geological conditions such as boulders are often met, so that a hole is collapsed in a drilling hole, a pile body is curled, and the pile body cannot be driven continuously. Because the pile body does not reach the target depth, the bearing capacity can not meet the requirement, and a new scheme needs to be searched at the moment, so that the bearing capacity of the pile body can meet the design requirement.
Disclosure of Invention
The invention aims to provide a solution for the problems that a single-pile foundation cannot be directly driven into a shallow covering layer or a sea area with complex geological conditions such as boulders and the like, the bearing capacity cannot meet requirements, and the rock-socketed construction cost and risk are extremely high, so that the bearing capacity and the overall rigidity of the single-pile foundation are improved, and the construction cost and the construction risk of weathered rocks during embedding can be avoided.
According to one aspect of the present invention, to achieve the above object, the technical solution adopted by the present invention is:
a single pile foundation supported by inclined piles is characterized by comprising single piles, inclined piles, a bearing platform and a supporting device;
the middle part of the underwater part of the single pile is provided with a single-pile annular support platform, the single-pile annular support platform is welded on the single pile along the periphery of the pile, the lower part of the single pile annular support platform is supported by a first inclined strut, and the single-pile annular support platform is used for limiting the support device; the inclined piles are provided with more than 3 round tubular piles, the tubular piles are uniformly arranged by taking the single pile as a center, each inclined pile is provided with an inclined pile annular supporting platform, the inclined pile supporting platforms are perpendicular to the central axis of the inclined pile, and the lower parts of the inclined pile annular supporting platforms are provided with second inclined struts for supporting;
the bearing platform is used for connecting and fixing the single pile and the inclined pile, the single pile vertically penetrates through the center of the bearing platform, and the top of the inclined pile is connected to the bearing platform;
and connecting devices are respectively arranged between each single pile and the single pile, each connecting device comprises a first connecting structure arranged on the single-pile annular supporting platform and a second connecting structure arranged on the inclined-pile annular supporting platform, and a support structure is hinged between the first connecting structure and the connecting structure.
On the basis of the technical scheme, the invention can also adopt the following further technical schemes or combine the further technical schemes for use:
each inclined pile is provided with an inclined pile annular supporting platform at a position slightly higher than the single pile annular supporting platform; the first connecting structure adopts a single-pile casing pipe, the second connecting structure adopts an inclined-pile casing pipe, and the supporting device further comprises a single-pile hinge, an inclined-pile hinge and a rigid connecting rod; the inner diameters of the single-pile sleeve and the inclined-pile sleeve are respectively slightly larger than the outer diameters of the single pile and the inclined pile, rubber buffer pads are arranged at the bottoms of the single-pile sleeve and the inclined-pile sleeve, and the rubber buffer pads are just respectively arranged on the single-pile annular supporting platform and the inclined-pile supporting step; the single pile hinge corresponding to the inclined pile is welded in the middle of the outer side of the single pile sleeve, and the inclined pile hinge is welded in the middle of the outer side of the inclined pile sleeve; and filling high-strength grouting material into gaps between the inner wall of the sleeve of the single-pile sleeve and the single pile and between the inner wall of the sleeve of the inclined-pile sleeve and the inclined pile to firmly bond the single-pile sleeve and the inclined pile, and correspondingly hinging the single-pile hinge and the inclined-pile hinge through the rigid connecting rod.
The single pile is circular tubular pile, and inside is equipped with horizontal stiffening rib and vertical stiffening rib to improve the bulk rigidity and the intensity of pile foundation.
The inclined piles are 6 in number and are uniformly arranged along the bearing platform at 60-degree intervals.
The diameter of the single pile is 5-8 m.
The bearing platform is formed by two layers of cast-in-place after the pile sinking and supporting devices are installed.
The length of the single-pile sleeve is half of the diameter of the single-pile, and the length of the inclined-pile sleeve is half of the diameter of the inclined-pile.
The rigid connecting rod is arranged obliquely, the end of the rigid connecting rod hinged with the oblique pile is high, and the end hinged with the single pile is low.
According to one aspect of the present invention, to achieve the above object, the present invention provides the construction method of the single pile foundation using the inclined pile support, wherein the installation process is mainly divided into 4 steps, namely, four processes of single pile positioning and driving, inclined pile positioning and driving, support device positioning, and bearing platform pouring; the concrete construction process is as follows:
1) hoisting the large-diameter single pile to a specified construction position, slowly drawing the large-diameter single pile to contact the seabed, preparing for single pile driving, and driving the single pile to a specified depth;
2) hoisting the inclined pile to a specified construction position, slowly drawing the inclined pile to contact the seabed at a certain inclination angle, preparing to drive the inclined pile, and driving the inclined pile to a specified depth;
3) the installation and positioning of the supporting device comprises the steps that a single-pile sleeve and an inclined-pile sleeve are respectively installed on a single pile and an inclined pile through hoisting, then, a gap between the single-pile sleeve and the inclined-pile sleeve is filled with grout to enable the single-pile sleeve and the inclined pile sleeve to be firmly bonded, and finally, single-pile hinges and inclined-pile hinges are hinged and connected in a one-to-one corresponding mode through rigid connecting rods;
4) laying bearing platform reinforcing steel bars, casting a bearing platform in situ, and solidifying the single pile and the inclined pile.
The invention has the beneficial effects that:
the single pile foundation supported by the inclined piles and the supporting device thereof are provided, the inclined piles are used for strengthening the strength and the rigidity of the single pile, and the problem of insufficient bearing capacity of the single pile under the condition of a shallow covering layer is solved; in order to further improve the integrity and coordination of the deformation of the single pile and the inclined pile, a set of supporting device is provided, and the comprehensive bearing capacity of the foundation can be further enhanced.
Drawings
FIG. 1 is a front view of an embodiment of the present invention;
FIG. 2 is a front view of a single pile of an embodiment of the present invention;
FIG. 3 is a top view of a mono-pile of an embodiment of the invention;
FIG. 4 is a front view of an oblique pile according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of an oblique pile according to an embodiment of the present invention along an axis;
FIG. 6 is a top view of a platform according to an embodiment of the present invention;
fig. 7 is an expanded top view of the support device 4 according to the embodiment of the present invention.
Detailed Description
A wind power plant at a certain offshore of China Fujian sea area adopts a wind power unit with a single unit capacity of 7MW, the water depth of a field area is 20-28 m, the thickness of a field covering layer is 26-32 m, and bedrock geology is arranged below the covering layer. If a single-pile foundation or high-pile cap foundation scheme is adopted, due to the fact that the thickness of a covering layer is thin, drilling holes are needed for rock embedding (embedding weathered rock) at the pile bottom. In addition, the possibility of local weathered rock formations and boulders is high, and the risk of hole collapse during drilling and steel plate hemming during pile foundation driving is easy to occur during field construction. By adopting the single-pile foundation (comprising the supporting device) supported by the inclined piles, weathered rocks do not need to be embedded, and the scheme and the specific implementation mode thereof are as follows:
the large-diameter single pile 1 adopts a steel pipe pile with the diameter of 5-8m, and a transverse stiffening rib 5 and a longitudinal stiffening rib 6 are arranged inside the steel pipe pile to enhance the rigidity and the strength of the steel pipe pile. The single pile 1 can be directly driven into weathered rock formations of 1-2 m without embedding weathered rock, and at the position of half of the water depth, the outer wall of the pile is welded with the annular supporting platform 7, the lower part of the annular supporting platform 7 is supported by the first inclined strut 81, and the first inclined strut 81 is welded with the annular supporting platform 7 and the large-diameter single pile 1. The annular support base 7 is used for limiting the support device.
The periphery of the single pile is supported and reinforced by 6 inclined piles 2, the pile diameter of each inclined pile is generally 1.8-2.5 m, and the spatial inclination is 5: 1, pile tops are uniformly distributed around the center of a single pile in a circumferential manner. The inclined pile 2 can be directly driven into a weathered rock stratum by 1-2 m without subsequent construction of weathered rock in embedding. Each inclined pile 2 is provided with an inclined pile annular supporting platform 9 which is vertical to the axis of the inclined pile at a position slightly higher than the single pile annular supporting platform 7, the lower part of the inclined pile is also supported by a second inclined strut 82, and the second inclined strut 82 is welded with the annular supporting platform 9 and the inclined pile 2. The annular support 9 is used for limiting the support device.
The bearing platform 3 is of a reinforced concrete structure, is used for connecting and fixing the large-diameter single pile 1 and the 6 inclined piles 2, and is formed by casting in situ. The bearing platform 3 is poured in two layers, and the lower layer concrete is used as a construction platform.
The connection between the mono pile 1 and the 6 batter piles 2 is further reinforced with support means. The supporting device consists of a single-pile casing pipe 11, an inclined-pile casing pipe 12, a single-pile hinge 13, an inclined-pile hinge 14 and a rigid connecting rod 15. The inner diameters of the single pile and the inclined pile casings 11 and 12 are slightly larger than the outer diameter of the pile, the length of the single pile and the inclined pile casings is about half of the diameter of the pile (to ensure the grouting thickness), and the single pile 1 and the inclined pile 2 with large diameters are respectively sleeved in the single pile and the inclined pile after pile sinking is finished. 6 single pile hinges 13 are evenly welded in the middle of the outer side of the single pile sleeve 11 in an annular mode, and 6 inclined pile hinges 14 are respectively welded in the middle of the outer side of the 6 inclined pile sleeve 12. And (5) installing a supporting device after the single pile and the inclined pile are sunk. Rubber buffer pads 10 are pasted at the bottoms of the single-pile sleeve 11 and the inclined-pile sleeve 12 in advance, and after the steel pipe pile is sleeved, the rubber buffer pads 10 are just padded on the annular supporting platform 7 and the annular supporting platform 9, so that the installation buffering effect is achieved, and the bottom sealing effect is achieved. Then, high-strength grouting material 16 is poured into the gap between the inner wall of the casing and the pile to firmly bond the casing and the pile. And finally, the single pile hinges 13 and the inclined pile hinges 14 are hinged and connected in a one-to-one corresponding mode through rigid connecting rods 15, and the length of the rigid connecting rods 15 is determined according to the field pile sinking condition.
The installation process of the single pile foundation supported by the inclined piles and the supporting device thereof comprises four processes of positioning and driving the single pile 1, positioning and driving the inclined pile 2, positioning and mounting the supporting device, pouring the bearing platform 3 and the like, and the concrete construction process comprises the following steps:
1) hoisting the large-diameter single pile 1 to a specified construction position, slowly drawing the large-diameter single pile to contact the seabed, preparing for single pile driving, and driving the single pile to a specified depth;
2) and hoisting the inclined pile 2 to a specified construction position, and moving the inclined pile to the specified construction position in a 5: 1, slowly drawing the inclined pile to contact the seabed to prepare for driving the inclined pile, and driving the inclined pile to a specified depth;
3) the installation of the supporting device in place comprises the steps that a single pile casing pipe 11 and an inclined pile casing pipe 12 are respectively installed on a single pile 1 and an inclined pile 2 through hoisting, then a gap between the single pile casing pipe and the inclined pile casing pipe is grouted for firm connection, and finally a single pile hinge 13 and an inclined pile hinge 14 are hinged and connected in a one-to-one correspondence mode through a rigid connecting rod 15;
4) laying bearing platform reinforcing steel bars, casting a bearing platform 3 in situ, and fixedly connecting the tops of the single piles 1 and the inclined piles 2 together.
According to the scheme of the single-pile foundation supported by the inclined piles and the supporting device thereof, the bearing capacity of the wind turbine foundation is greatly improved, and the problem that rock-socketed (embedded weathered rock) construction is needed when a conventional single-pile or high-pile bearing platform foundation is adopted in the project is solved. The supporting device further ensures the integrity and coordination of the deformation of the single pile 1 and the inclined pile 2, and enhances the strength and rigidity of the structure.
The above embodiment is merely a preferred embodiment of the present invention, and those skilled in the art will understand that modifications or substitutions of technical solutions or parameters in the embodiment can be made without departing from the principle and essence of the present invention, and all of them shall be covered by the protection scope of the present invention.
Claims (9)
1. A single pile foundation supported by inclined piles is characterized by comprising single piles (1), inclined piles (2), a bearing platform (3) and a supporting device;
the middle part of the underwater part of the single pile is provided with a single-pile annular support platform (7), the annular support platform (7) is welded on the single pile along the periphery of the pile, the lower part of the annular support platform is supported by a first inclined strut (81), and the single-pile annular support platform (7) has the function of limiting the support device (4); the inclined piles (2) are provided with more than 3 round tubular piles, the tubular piles are uniformly arranged by taking the single pile as a center, each inclined pile (2) is provided with an inclined pile annular supporting platform (9), the inclined pile supporting platform (9) is vertical to the central axis of the inclined pile, and the lower part of the inclined pile annular supporting platform is provided with a second inclined strut (82) for supporting;
the bearing platform (3) is used for connecting and fixing the single pile (1) and the inclined pile (2), the single pile (1) vertically penetrates through the center of the bearing platform, and the top of the inclined pile (2) is connected to the bearing platform;
and connecting devices are respectively arranged between each single pile and the single pile, each connecting device comprises a first connecting structure arranged on the single-pile annular supporting platform and a second connecting structure arranged on the inclined-pile annular supporting platform, and a support structure is hinged between the first connecting structure and the connecting structure.
2. A mono-pile foundation supported by oblique piles according to claim 1, wherein each oblique pile (2) is provided with said oblique pile annular support platform (9) at a position slightly higher than the mono-pile annular support platform (7); the first connecting structure adopts a single-pile casing pipe (11), the second connecting structure adopts an inclined-pile casing pipe (12), and the supporting device further comprises a single-pile hinge (13), an inclined-pile hinge (14) and a rigid connecting rod (15); the inner diameters of the single-pile sleeve (11) and the inclined-pile sleeve (12) are respectively slightly larger than the outer diameters of the single pile and the inclined pile, rubber buffer cushions (10) are arranged at the bottoms of the single-pile sleeve (11) and the inclined-pile sleeve (12), and the rubber buffer cushions (10) are just respectively cushioned on the single-pile annular support platform (7) and the inclined-pile support step (9); the single-pile hinge (13) is welded in the middle of the outer side of the single-pile casing pipe (11) corresponding to the inclined pile, and the inclined-pile hinge (14) is welded in the middle of the outer side of the inclined-pile casing pipe (12); high-strength grouting materials (16) are filled into gaps between the inner wall of the sleeve of the single-pile sleeve (11) and the single pile and between the inner wall of the sleeve of the inclined-pile sleeve (12) and the inclined pile to firmly bond the single-pile sleeve and the inclined pile, and the single-pile hinge (13) and the inclined-pile hinge (14) are correspondingly hinged and connected through a rigid connecting rod (15).
3. A mono pile foundation supported by oblique piles according to claim 1, wherein said mono pile (1) is a circular pile with internal transverse (5) and longitudinal (6) stiffening ribs to improve the overall stiffness and strength of the pile foundation.
4. A mono-pile foundation supported by oblique piles according to claim 1, wherein said oblique piles (2) are uniformly arranged at 60 ° intervals along the cap (3) for a total of 6.
5. A mono-pile foundation supported by oblique piles according to claim 1, wherein said mono-pile has a diameter of 5-8 m.
6. A mono-pile foundation supported by oblique piles according to claim 1, wherein the cap (3) is cast in place in two layers after the pile sinking and supporting means are installed.
7. A mono pile foundation supported by oblique piles according to claim 2, wherein the length of the mono pile casing (11) is half of the diameter of the mono pile and the length of the oblique pile casing (12) is half of the diameter of the oblique pile.
8. A mono-pile foundation supported by oblique piles according to claim 2, wherein said rigid connecting rods (15) are arranged obliquely with the end connected to the oblique pile hinge (14) being higher and the end connected to the mono-pile hinge being lower.
9. A method of constructing a mono-pile foundation using an inclined pile support according to claim 1, wherein: the installation process is mainly divided into 4 steps, namely, the single pile is in place and is driven into the position, the inclined pile is in place and is driven into the position, the supporting device is installed in place, the bearing platform is poured and the like; the concrete construction process is as follows:
1) hoisting the large-diameter single pile to a specified construction position, slowly drawing the large-diameter single pile to contact the seabed, preparing for single pile driving, and driving the single pile to a specified depth;
2) hoisting the inclined pile to a specified construction position, slowly drawing the inclined pile to contact the seabed at a certain inclination angle, preparing to drive the inclined pile, and driving the inclined pile to a specified depth;
3) the installation and positioning of the supporting device comprises the steps that a single-pile sleeve and an inclined-pile sleeve are respectively installed on a single pile and an inclined pile through hoisting, then, a gap between the single-pile sleeve and the inclined-pile sleeve is filled with grout to enable the single-pile sleeve and the inclined pile sleeve to be firmly bonded, and finally, single-pile hinges and inclined-pile hinges are hinged and connected in a one-to-one corresponding mode through rigid connecting rods;
4) laying bearing platform reinforcing steel bars, casting a bearing platform in situ, and solidifying the single pile and the inclined pile.
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| CN202111024991.3A CN114319412A (en) | 2021-09-02 | 2021-09-02 | Single-pile foundation supported by inclined piles and construction method thereof |
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| CN202111024991.3A CN114319412A (en) | 2021-09-02 | 2021-09-02 | Single-pile foundation supported by inclined piles and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114808945A (en) * | 2022-04-28 | 2022-07-29 | 中铁时代建筑设计院有限公司 | Cast-in-place large-diameter tubular pile for foundation pit support and tubular pile construction method |
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2021
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| JP2003027501A (en) * | 2001-07-19 | 2003-01-29 | Mitsubishi Heavy Ind Ltd | Installation method for diagonal pile and underwater foundation |
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