JP3242173U - Reinforcing device for single pile foundation - Google Patents

Abstract

A reinforcing device for a single pile foundation is provided, which solves the problem that a cylindrical body subsides in the surface layer around the single pile foundation and the soil strength around the single pile foundation cannot be strengthened. A through hole is provided at the center point of the top plate 22, the inside of the through hole is suitable for accommodating a single pile foundation 4, the bottom surface of the top plate is bonded to the surface of the sea floor, and the top plate has several Such positioning holes are provided, and the positioning holes are a top plate structure suitable for being provided on the outer periphery of a single pile foundation, and a micropile structure 1 provided in one-to-one correspondence with the positioning holes, each micro A pile structure is provided through the positioning holes, and each micropile structure has an upper end connected to the top plate structure and a lower end anchored in the seabed around the single-pile foundation, and the top plate is received by the single-pile foundation. Partially carrying the load-bearing capacity, the micropile structure includes several micropile structures that fixedly connect the roof structure to the sea floor and enhance the soil strength around the single-pile foundation pile. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to the field of offshore wind turbine group foundations, and more particularly to a reinforcing device for single pile foundations.

With the rapid progress of wind power generation technology around the world, wind power generation has become an important support for countries' transition to clean energy. An offshore wind power generation system consists of a generator cluster, a tower and a generator cluster foundation, and the offshore wind power foundation structure is an important part of the design, construction and maintenance of an offshore wind power plant. According to relevant data statistics, the single-pile foundation occupies nearly 80% of the existing offshore wind farms. During the operation of the wind power generator, the single pile foundation is subjected to cyclic loads formed by combining the load of the wind power generator, wave load, water flow load, sea ice load, seismic action, etc. , the marine soil around the single-pile foundation is repeatedly weakened, creating a weakened area. Due to the presence of the weakened area, the load-bearing capacity of the single-pile foundation gradually decreases, causing fatigue damage to the steel structure itself. and the service life is reduced.

Regarding the pile foundation of an existing offshore wind power plant, it is important to improve the strength and rigidity of the topsoil around the pile foundation by the action of repeated loads over a long period of time in order to extend the service life. Researchers proposed to insert a tubular body around the pile foundation to form a single pile-tubular composite foundation to improve the load-bearing capacity of the pile foundation. In the case of a seabed with a clay layer that is high and the upper part of the surface layer is thick, it is difficult for the cylindrical body to subside, and the single pile foundation cannot strengthen the soil strength around the single pile foundation during subsidence. There is still a weakened area around the bottom of the pile foundation.

Therefore, the technical problem to be solved by the present invention is that the cylindrical body in the prior art sinks in the surface layer around the single pile foundation and cannot strengthen the soil strength around the single pile foundation, To provide a reinforcing device for a single pile foundation by eliminating the defect of having a weakened area around the bottom.

In order to solve the above problems, the present invention provides a single pile foundation reinforcement device,
A top plate structure provided with a top plate, wherein a through hole is provided at the center point of the top plate, the inside of the through hole is suitable for accommodating a single pile foundation, and the bottom surface of the top plate is the sea floor. a top plate structure bonded to the surface, the top plate is provided with several positioning holes, and the positioning holes are suitable for being provided on the outer circumference of a single pile foundation;
A micropile structure provided in one-to-one correspondence with the positioning hole, each micropile structure passing through the positioning hole, each micropile structure having an upper end connected to the top plate structure and a lower end is anchored in the seabed around the single-pile foundation, the top plank partially carrying the load-bearing forces experienced by the single-pile foundation, the micropile structure anchoring and connecting the top plank structure to the seabed; and several micropile structures to strengthen the soil around the single-pile foundation pile.

Optionally, said micropile structure comprises a reinforcing body with several drill rods connected, said drill rods being hollow and provided through, a drill head being connected to the bottom of said reinforcing body, said drill head Grout holes are provided on the sides of the

Optionally, a high-strength cement mortar is filled in the gap between the reinforcement and the seabed.

Optionally, a number of equally spaced connection rings are provided around the circumference of the reinforcement.

Optionally, said micropile structures are provided perpendicularly or at an acute angle to the sea floor.

Optionally, an inner guide rail and an outer guide rail are provided on the upper surface of the top plate, and both the inner guide rail and the outer guide rail are suitable for moving the submarine drill, and the inner guide rail and the single pile foundation are combined. The space between is an inner ring, the space between the inner guide rail and the outer guide rail is a middle ring, and the outer circumference of the outer guide rail is an outer ring.

Optionally, the inner, middle and outer rings are each provided with several micropile structures.

Optionally, further comprising a support structure, said support structure comprising telescoping rods and support legs, said support legs comprising a lamination segment and a support segment, said lamination segment hinged to the outer wall of the single-pile foundation. Suitable for connection, both ends of the telescopic rod are respectively fixedly connected to the single-pile foundation and the supporting segment, and the supporting segment is provided on the upper surface of the roof structure.

Optionally, a push rod is further provided between the telescopic rod and the single pile foundation.

Optionally, the telescopic rod is provided with several concentric cylinders, the adjacent concentric cylinders are not of the same diameter, and the telescopic rod is filled with inert gas.

The technical solution of the present invention has the following advantages.

1. The single pile foundation reinforcement device provided by the present invention is a top plate structure with a top plate, a through hole is provided at the center point of the top plate, and the single pile foundation is accommodated in the through hole. The bottom surface of the top plate is attached to the surface of the seabed, the top plate is provided with several positioning holes, and the positioning holes are provided on the outer circumference of the single-pile foundation. A micropile structure provided in one-to-one correspondence with the hole, each micropile structure having an upper end connected to the top plate structure and a lower end anchored in the seabed around the single pile foundation, and the top plate Some micropile structures partially carry the load-bearing force received by the single-pile foundation, and the micropile structure fixes and connects the top plate structure to the sea floor to strengthen the soil strength around the single-pile foundation pile. and including. The top plate structure connects the top plate to the non-weakened area at the bottom of the single-pile foundation by installing the top plate, increasing the horizontal load-bearing capacity of the single-pile foundation, strengthening the weakened area around the bottom of the single-pile foundation, and creating a micropile structure. can not only fix and connect the top plate structure to the sea floor, but also strengthen the soil strength around the single-pile foundation, It provides the shear stress at the bottom of the pile and the bending moment at the bottom of the pile when it is tilted and deformed, reduces the deformation of the pile body, improves the horizontal load-bearing capacity of the single-pile foundation, and effectively stabilizes the single-pile foundation. increase and to some extent prolong the service life.

2. In the single pile foundation reinforcement device provided by the present invention, the micropile structure includes a reinforcement body with several drill rods connected, the drill rods are hollow and penetrated, and the bottom of the reinforcement body is A drill head is connected to the drill head, a grout hole is provided on the side of the drill head, high-strength cement mortar is filled in the gap between the reinforcing body and the sea floor and the drill rod, and the cement mortar is passed through the grout hole It enters into the gap to provide a fixed connection between the drill rod and the sea floor.

3. The single-pile foundation reinforcement device provided by the present invention is provided with several connecting rings installed at equal intervals around the outer circumference of the reinforcing body, and the installation of the connecting rings will cause hole collapse during drilling of the micropile structure. and also increase the strength of the connection between the reinforcing body and the cement-bonded body formed of cement mortar.

4. In the single pile foundation reinforcement device provided by the present invention, the micropile structure is installed vertically or at an acute angle on the sea floor, and the combination of the inclined micropile and the vertical micropile provides greater horizontal strength. , forming a group pile effect of the micropile structure.

5. The single pile foundation reinforcement device provided by the present invention is provided with an inner guide rail and an outer guide rail on the upper surface of the top plate, both of which are suitable for moving the submarine drill, The section between the inner guide rail and the single pile foundation is the inner ring, the section between the inner guide rail and the outer guide rail is the middle ring, and the outer circumference of the outer guide rail is the outer ring. It provides convenience for construction after identifying it.

6. The single pile foundation reinforcement device provided by the present invention is provided with several micropile structures on the inner ring, middle ring and outer ring, respectively, to achieve a stronger connection between the micropile structure and the sea floor. do.

7. The single-pile foundation reinforcement device provided in the present invention further comprises a support structure, the support structure comprising a telescopic rod and a support leg, the support leg comprising a bonding segment and a supporting segment, and a bonding segment is suitable for being hingedly connected to the outer wall of the single-pile foundation, both ends of the telescopic rod are fixedly connected to the single-pile foundation and the supporting segment respectively, the supporting segment is fixedly connected to the roof structure, and the gluing segment is hinged to the single-pile foundation to rotate the support leg around the hinge connection point, and the support segment is provided on the upper surface of the top plate structure to achieve its own fixation, thereby allowing the single-pile foundation to tilt. When the telescopic rods provide support to the single-pile foundation.

8. The single pile foundation reinforcement device provided by the present invention further includes a push rod between the telescopic rod and the single pile foundation, the push rod serves to connect the telescopic rod and further support the telescopic rod. Also, the push rod adjusts the opening angle of the telescopic rod.

9. The single pile foundation reinforcement device provided by the present invention is that the telescopic rod is provided with several concentric cylinders, the adjacent concentric cylinders are not of the same diameter, and the telescopic rod is filled with inert gas. , the expansion and contraction of the telescopic rod is realized.

In order to more clearly describe the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings that need to be used to describe the specific embodiments or the prior art. In addition, the drawings in the following description are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

1 is a schematic diagram of a single-pile foundation reinforcing device provided in an embodiment of the present invention; FIG. 1 is a schematic diagram of a micropile structure provided in an embodiment of the present invention; FIG. FIG. 3 is a top view of a micropile structure arrangement provided in an embodiment of the present invention; 1 is a schematic diagram of a support structure provided in an embodiment of the present invention; FIG. FIG. 4 is a schematic diagram of the connection between a telescopic rod and a push rod provided in an embodiment of the present invention; 1 is a schematic diagram of a micropile structure construction provided in an embodiment of the present invention; FIG.

The following clearly and completely describes the technical solutions of the present invention with reference to the drawings, and obviously the described embodiments are not all but some of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. Or the positional relationship is based on the orientation or positional relationship shown in the drawings, and is merely for the purpose of facilitating and simplifying the description of the invention, such devices or elements having a particular orientation. , does not indicate or imply that it must be configured and operated in any particular orientation and, therefore, should not be understood as a limitation on the invention. Also, the terms "first", "second" and "third" are descriptive only and cannot be understood as indicating or implying relative importance.

In the description of the present invention, the terms "attachment", "connection", and "connection" should be understood in a broad sense unless otherwise clearly defined and limited. , detachable connection, integral connection, mechanical connection, electrical connection, direct connection, or indirect connection through an intermediate medium. It may be connected, or it may be communication inside the two elements. A person skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific situation.

Also, the technical features according to different embodiments of the present invention described below can be combined with each other as long as they do not contradict each other.

A specific embodiment of the single-pile foundation reinforcement device shown in FIGS. The bore is suitable for housing a single-pile foundation 4 and includes a roof structure 2 in which the underside of a roof 22 is bonded to the surface of the seabed.

As shown in FIGS. 1, 2 and 3, the top plate 22 is provided with several positioning holes, the positioning holes are suitable for being provided on the outer circumference of the single pile foundation 4, and each positioning hole has one Two micropile structures 1 are provided correspondingly, each micropile structure 1 having an upper end connected to a top plate structure 2 and a lower end anchored in the seabed around a single pile foundation 4, where the micropile structure The diameter is 100-300 mm, preferably 200 mm. As shown in FIGS. 1 and 2, the micropile structure 1 includes a reinforcing body 11 and a cement-bonded body 12, in which the reinforcing body 11 consists of several drill rods connected, and the bottom of the reinforcing body 11 The drill head is connected to , the drill rod has a hollow through structure, the rod body of the drill rod is provided with grout holes, and high-strength cement mortar is placed in the gap between the reinforcing body 11 and the sea floor and in the drill rod. be filled. As shown in FIG. 2, the cement bond 12 is grouted to the inner wall of the drill rod through the central grouting passage of the drill rod, and the high-strength cement mortar reaches the gap between the reinforcement 11 and the sea floor through the grout holes. After that, a high-strength cement mortar is set and formed. In order to avoid pore collapse occurring in the micropile structure 1 during the grouting process, the micropile structure 1 is provided perpendicularly or at an acute angle to the seabed so that the top plate structure 2 receives greater force, thereby , the association of slanted and vertical micropiles provides greater horizontal bearing capacity and forms the group pile effect of the micropile structure 1. In order to facilitate the work of the submarine drill 5, the top plate 22 is provided with an inner guide rail and an outer guide rail 23, both of which are suitable for moving the submarine drill, and the inner guide An inner ring is formed between the rail and the single pile foundation 4, a middle ring is formed between the inner guide rail and the outer guide rail 23, and an outer ring is formed around the outer circumference of the outer guide rail 23. , adjacent micropile structures 1 are provided at regular intervals, the length of the micropile structure 1 gradually decreases from the outer ring to the inner ring, and the inner ring, the outer ring A ring and a middle ring are provided concentrically with the single pile foundation 4, respectively. The distance between adjacent micropile structures 1 is 3 to 6 times, preferably 4 times, the diameter of the micropile structure 1 itself.

In order to further support the single-pile foundation 4, as shown in FIGS. 1, 4 and 5, it further includes four support structures 3 equidistantly provided around the perimeter of the single-pile foundation 4, each support structure 3 Both include one telescopic rod 31 and one support leg 32, wherein the support leg 32 includes a bonded segment and a support segment, the bonded segment is an arc-shaped plate, and the single pile foundation 4 It is hinged and suitable for rotating the support leg 32 around the hinge connection point, both ends of the telescopic rod 31 are respectively fixedly connected to the single pile foundation 4 and the support segment, and the support segment is a top plate structure. 2 is provided on the upper surface. A push rod 33 is further provided between the telescopic rod 31 and the single pile foundation 4 to adjust the opening angle of the telescopic rod 31 . In order to realize the telescopic function, the telescopic rod 31 has several concentric cylinders, adjacent concentric cylinders are not of the same diameter, and the telescopic rod 31 is filled with inert gas. Specifically, the inert gas is helium gas.

In the specific implementation process, the field workers removed the wind power generator module, installed the top plate 22 on the outer circumference of the single pile foundation 4, gradually placed it on the surface of the sea floor, and installed the submarine drill 5 on the inner guide rail. Alternatively, it is lifted on the outer guide rail 23, and the submarine drill 5 is moved along the guide rail by the action of its own power system, and drilled according to the positioning hole. Also, before construction, the telescopic rods 31 and the push rods 33 are contracted, and the field workers contract the support structure 3 into the cavities prepared on the perimeter of the single pile foundation 4 . The subsea drill 5 moves to the guide rail, completes the construction of several micropile structures 1 each time, drills according to the pre-designed angle of the micropile structure 1, and constructs one micropile structure 1. Place the drill rod in the drilled hole each time and replace with a new drill rod. A drill head is connected to the bottom of the drill rod, a grout hole is provided on the side of the drill head, the hollow through structure of the drill rod and the grout hole form a grouting passage, after one drill hole is completed, the reinforcing body 11 to the sea floor and the top plate 22 respectively, the submarine drill 5 applies high-strength loose cement mortar to the gap between the drill rod outer wall 21 and the drill hole inner wall through the grouting passage and the grout hole. Pour in. After the construction of the micropile structure 1 is completed, the concrete 24 is placed between the upper surface of the top plate 22 and the outer wall 21 of the top plate 22, and the connection of the support legs 32 with the support segments is realized with the concrete 24 layer. After the concrete 24 has solidified, the telescopic rods 31 of the support structure 3 are extended to push the support legs 32 to move around the hinge connection points until the support segments are glued to the upper surface of the top structure 2. . The slanted micropile structure 1 and the vertical micropile structure 1 formed after the construction is completed are linked, and the axial direction of the pile body of the slanted micropile structure 1 is at the boundary of the weakened area 6 around the pile foundation. The combination of the vertical and inclined micropile structure 1 and the vertical micropile structure 1 can provide greater horizontal bearing capacity, and the micropile between the inner ring and the middle ring and between the middle ring and the outer ring The group pile effect of structure 1 is fully utilized.

The single-pile foundation reinforcing structure provided in the present application has the following advantages.
(1) The micropile structure 1 around the pile foundation strengthens the strength of the earth body in the repeatedly weakened area 6 of the surrounding seabed, further improves the horizontal bearing capacity of the earth body, and further improves the horizontal load bearing capacity of the single pile foundation 4. , In addition, the horizontal load of the single pile foundation 4 is shared by the frictional action between the top plate structure 2 around the single pile foundation 4 and the seabed soil body, the horizontal load bearing capacity of the single pile foundation 4 is improved, and the single pile foundation The micropile at the bottom end of 4 limits the inclination deformation of the pile foundation, improves the soil shearing capacity at the bottom end of the single pile foundation 4, and further improves the horizontal load bearing capacity of the single pile foundation 4,
(2) The interaction between the support structure 3 and the top beam around the single-pile foundation 4 improves the rigidity of the single-pile foundation 4 and the horizontal and vertical load-bearing capacity of the pile foundation; 31, supporting legs 32, push rods 33 synergistic effect to provide the single pile foundation 4 with damping performance, that is, to improve the adaptability of the single pile foundation 4 under extreme load action,
(3) Direct construction of the submarine drill 5 on the surface of the sea floor reduces the influence of sea conditions on the construction process. In addition, by using the drill rod as the reinforcing body 11 of the micropile, the construction process of the micropile is simplified, the construction efficiency is improved, and the connection ring is attached to the rod body of the drill rod. By providing, the connection strength between the reinforcing body 11 and the cement-bonded body 12 is strengthened,
(4) The construction of several micropile structures 1 effectively avoids the construction of large-diameter rock sockets in shallow seafloor geological conditions, improving construction efficiency, and the reinforcement device is a floating type alone. It can not only be used as a pile anchor structure for the mooring system of wind turbines, but also can be combined with foundations such as offshore wind turbine pile guides to form a new composite foundation.

In alternative embodiments, the number of support structures 3 may be three, five, six or even more.

As an alternative embodiment, the length of the micropile structure 1 may be in other forms, such as gradually increasing from the outer ring to the inner ring, or even between the outer ring and the inner ring.

Obviously, the above examples are merely illustrative for purposes of clarity and do not limit the embodiments. For those skilled in the art, other different changes or variations in addition to those described above can be made. It is neither necessary nor possible for this specification to be exhaustive of all embodiments. The obvious changes or variations brought about by it are still within the creative protection scope of the present invention.

REFERENCE SIGNS LIST 1 micropile structure 11 reinforcing body 12 cement bonded body 2 top plate structure 21 outer wall 22 top plate 23 outer guide rail 24 concrete 3 support structure 31 telescopic rod 32 support leg 33 push rod 4 single pile foundation 5 submarine drill 6 weakened area

Claims (10)

A reinforcing device for a single pile foundation,
A top plate structure (2) provided with a top plate (22), wherein a through hole is provided at the center point of the top plate (22), and a single pile foundation (4) is accommodated in the through hole. The bottom of the top plate (22) is glued to the surface of the sea floor, the top plate (22) is provided with several positioning holes, and the positioning holes are located on the outer circumference of the single pile foundation (4) a top plate structure (2) suitable to be provided;
Micropile structures (1) provided in one-to-one correspondence with positioning holes, each micropile structure (1) being provided through the positioning hole, and each micropile structure (1) having an upper end is connected to the top plate structure (2), the lower end of which is anchored in the sea bed around the single pile foundation (4), said top plate (22) partially supporting the load bearing capacity of the single pile foundation (4) Several micropile structures (1 ) and including
A reinforcing device for a single pile foundation, characterized by: Said micropile structure (1) comprises a reinforcement body (11), said reinforcement body (11) is formed by connecting several drill rods, said drill rods are hollow and provided through, said reinforcement body (11) ) is connected with a drill head, and a side surface of the drill head is provided with a grout hole. A reinforcing device for a single pile foundation according to claim 2, characterized in that a gap between the reinforcing body (11) and the sea floor is filled with high-strength cement mortar. The device for reinforcing a single pile foundation according to claim 3, characterized in that a number of equally spaced connecting rings are provided around the circumference of the reinforcing body (11). The reinforcing device for single pile foundation according to claim 4, characterized in that the micropile structure (1) is installed perpendicularly or at an acute angle to the seabed. An inner guide rail and an outer guide rail (23) are provided on the upper surface of the top plate (22), both of the inner guide rail and the outer guide rail (23) are suitable for moving the submarine drill (5), and the An inner ring is provided between the inner guide rail and the single pile foundation (4), a middle ring is provided between the inner guide rail and the outer guide rail (23), and an outer ring is provided around the outer guide rail (23). A reinforcing device for a single pile foundation according to claim 1, characterized in that: The device for reinforcing single pile foundation according to claim 6, characterized in that the inner ring, middle ring and outer ring are respectively provided with several micropile structures (1). further comprising a support structure (3), said support structure (3) comprising a telescopic rod (31) and a support leg (32), said support leg (32) comprising a lamination segment and a support segment, said The lamination segment is suitable for being hingedly connected to the outer wall (21) of the single-pile foundation (4), both ends of said telescopic rod (31) are respectively fixedly connected to the single-pile foundation (4) and the supporting segment, The device for reinforcing a single pile foundation according to any one of claims 1 to 7, characterized in that said support segments are provided on the upper surface of the top plate structure (2). The single-pile foundation reinforcing device according to claim 8, further comprising a push rod (33) installed between the telescopic rod (31) and the single-pile foundation (4). 4. The telescopic rod (31) is provided with several concentric cylinders, the adjacent concentric cylinders are not of the same diameter, and the telescopic rod (31) is filled with inert gas. 9. A reinforcing device for a single pile foundation according to 9.

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