Composite steel pipe single pile filled based on recycled building material and construction method thereof

Abstract

The application discloses a composite steel pipe single pile filled with recycled building materials and a construction method thereof, and belongs to the technical field of steel pipe piles. The composite steel pipe single pile comprises a steel pipe pile body, a cavity is arranged in the steel pipe pile body, the cavity is used for filling recycled building materials, a plurality of interface connecting mechanisms are arranged in the cavity, and a sealing mechanism is arranged on the top surface of the steel pipe pile body. By constructing a steel-filling core composite cross-section structure, the cross-section inertia moment and the overall bending stiffness are improved, the pile top displacement and bending deformation can be effectively reduced under the action of horizontal load, the single pile horizontal bearing capacity is improved by optimizing the cross-section stress system under the condition of controlling the steel consumption, and the structural material utilization efficiency is improved. The collaborative working capacity between the steel pipe and the filling body is enhanced through the interface connecting structure, the overall stress performance of the composite structure is improved, the air retention space in the steel pipe is reduced by filling the recycled building materials, the temperature and humidity fluctuations are alleviated, and the internal service environment is improved.

Description

Technical Field

[0001] This invention belongs to the field of steel pipe pile technology, and particularly relates to a composite steel pipe monopile based on recycled building materials and its construction method. Background Technology

[0002] As offshore wind power develops towards larger capacity and deeper waters, the single-unit capacity of wind turbines continues to increase, and tower height and rotor diameter are constantly expanding, significantly increasing the horizontal loads and overturning moments borne by the foundation structure. Existing large-diameter steel pipe monopiles are mainly hollow structures. During pile driving, the surrounding soil is squeezed into the pile, typically forming a soil plug of a certain height at the pile bottom. The height of this soil plug is greatly affected by factors such as geological conditions, pile diameter, pile driving method, and construction parameters, exhibiting considerable uncertainty and difficulty in precise control. Current designs typically only consider the soil plug as an incidental phenomenon formed during construction, without further structural utilization of the space within the pile.

[0003] To improve the horizontal bearing capacity of a single pile, existing technologies mainly adopt methods such as increasing the pile diameter, increasing the wall thickness of the steel pipe, or using high-strength steel to improve the bending stiffness and ultimate bearing capacity of the pile. In addition, there are also technical solutions that pour concrete inside the steel pipe to form a steel-concrete composite structure to enhance the overall cross-sectional stiffness of the pile. However, the above technical solutions still have the following shortcomings: (1) Increasing the bearing capacity by increasing the pile diameter or wall thickness will significantly increase the amount of steel used and the project cost; (2) Although the steel-concrete composite structure can improve the stiffness, the construction process is complex, the requirements for offshore construction conditions are high, and the cost of concrete materials and construction is relatively large; (3) For unfilled structures, the internal space of the steel pipe pile is not effectively utilized, and the hollow structure has a limited effect on improving the overall bending resistance and damping performance; (4) In the high humidity and high salinity environment of the ocean, the hollow steel pipe is prone to forming a condensation environment, which may aggravate the corrosion of the inner wall and affect the durability of the structure.

[0004] Furthermore, the demolition process generates a large amount of solid waste such as concrete blocks and bricks. Current resource utilization methods mainly focus on road base courses or general backfilling projects, lacking mature application technologies in the field of marine load-bearing structures. Meanwhile, most existing steel pipe monopiles are hollow structures, with their internal space not effectively utilized. Improving horizontal load-bearing capacity usually relies on increasing steel usage or using high-cost filling materials. Therefore, how to construct an internally filled structural system that works synergistically with the steel pipe piles to increase the equivalent bending stiffness of the pile cross-section, thereby enhancing the horizontal load-bearing capacity and structural durability of monopiles, while simultaneously achieving the engineering utilization of recycled building materials, has become a pressing technical problem to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a composite steel pipe monopile based on recycled building materials and its construction method, so as to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a composite steel pipe monopile based on recycled building materials, comprising a steel pipe pile body, wherein the steel pipe pile body has a cavity for filling recycled building materials, the cavity is provided with multiple interface connection mechanisms, and the top surface of the steel pipe pile body is provided with a sealing mechanism.

[0007] Optionally, the recycled building materials include waste concrete blocks and bricks.

[0008] Optionally, the interface connection mechanism is a shear connector disposed within the cavity.

[0009] Optionally, the diameter of the steel pipe pile is 6-10m.

[0010] A construction method for composite steel pipe monopiles filled with recycled building materials includes the following steps: S1. Complete the single pile driving construction of the steel pipe pile body to reach the design elevation; S2. Detect the height of the soil plug inside the steel pipe pile and level the surface of the soil plug; S3. An interface connection mechanism is arranged on the inner wall of the steel pipe pile. S4. The treated recycled building materials are filled into the interior of the steel pipe pile in layers; S5. Control the filling height according to requirements to form a full-length or segmented filling structure; S6. A sealing mechanism is installed at the top of the steel pipe pile to improve the internal service environment and the overall bending strength of the steel pipe pile.

[0011] Optionally, the recycled building materials in step S4 are subjected to crushing, screening, and gradation optimization treatments in sequence.

[0012] Optionally, the bending stiffness of the composite section can be expressed as, in, , The elastic modulus and moment of inertia of the steel pipe section; , The equivalent elastic modulus and moment of inertia of the infill; , This is the conversion term for the interface collaboration coefficient.

[0013] Optionally, in step S4, each layer of the recycled building material is compacted or vibrated to achieve a denser finish.

[0014] This invention discloses the following technical effects: By constructing a steel-filled composite section structure, the moment of inertia and overall bending stiffness of the section are improved, effectively reducing pile top displacement and bending deformation under horizontal loads; under the condition of controlling the amount of steel used, the horizontal bearing capacity of a single pile is improved by optimizing the cross-sectional stress system, thereby improving the utilization efficiency of structural materials; the interface connection structure enhances the synergistic working ability between the steel pipe and the filler, improving the overall stress performance of the composite structure; filling with recycled building materials reduces the air retention space inside the steel pipe, mitigates temperature and humidity fluctuations, and helps improve the internal service environment. At the same time, the heat capacity and moisture absorption characteristics of the recycled building materials help alleviate temperature fluctuations and humidity changes, improve internal environmental conditions, reduce corrosion risks, and improve structural durability. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the composite steel pipe monopile based on recycled building materials according to the present invention. Figure 2 This is a schematic diagram of the stress on the steel pipe pile body of the present invention; Figure 3 This is a schematic diagram of the construction method of the composite steel pipe monopile based on recycled building materials according to the present invention.

[0016] Figure label: 1. Steel pipe pile body; 2. Cavity; 3. Recycled building materials; 4. Interface connection mechanism; 5. Sealing mechanism. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figures 1 to 3 As shown, this embodiment provides a composite steel pipe monopile based on recycled building material 3, including a steel pipe pile body 1, a cavity 2 inside the steel pipe pile body 1, the cavity 2 being filled with recycled building material 3, a plurality of interface connection mechanisms 4 inside the cavity 2, and a sealing mechanism 5 on the top surface of the steel pipe pile body 1.

[0020] By constructing a steel-filled composite section structure, the moment of inertia and overall bending stiffness of the section are improved, which can effectively reduce pile top displacement and bending deformation under horizontal loads. Under the condition of controlling the amount of steel used, the horizontal bearing capacity of a single pile is improved by optimizing the cross-sectional stress system, thereby improving the utilization efficiency of structural materials. The interface connection structure enhances the synergistic working ability between the steel pipe and the filler, improving the overall stress performance of the composite structure. Filling with recycled building material 3 reduces the air retention space inside the steel pipe, mitigates temperature and humidity fluctuations, and helps improve the internal service environment. At the same time, the heat capacity and moisture absorption characteristics of the recycled building material 3 help alleviate temperature fluctuations and humidity changes, improve internal environmental conditions, reduce corrosion risks, and improve structural durability.

[0021] The sealing mechanism 5 includes a sealing cover plate disposed on the top of the steel pipe pile 1 and a sealing layer disposed between the sealing cover plate and the steel pipe pile 1; wherein the sealing cover plate can be fixed to the top of the steel pipe pile 1 by welding, bolting or flange connection; the sealing layer can be an annular rubber sealing ring, elastic sealing gasket or waterproof sealing adhesive layer, used to prevent seawater, water vapor and external impurities from entering the internal space of the steel pipe pile 1.

[0022] Further optimization of the scheme involves recycled building materials 3, including waste concrete blocks and bricks. Waste concrete blocks and bricks generated during building demolition are recycled into structural infill materials, achieving the engineering utilization of waste resources. This meets the strength and durability requirements of the marine environment, reduces reliance on traditional building materials, and improves the overall corrosion resistance and service life of marine load-bearing structures.

[0023] This invention improves structural performance and durability by optimizing the load-bearing system of steel pipe monopiles, achieving the effective utilization of waste building materials without significantly increasing material costs. This invention also enhances the corrosion resistance and service life of marine load-bearing structures, promoting green construction and efficient resource utilization.

[0024] The scheme is further optimized by designing interface connection mechanism 4 as a shear connector installed within cavity 2. This enhances shear transmission capacity, restricts relative slippage between the steel pipe and the filler, and ensures that they form an integral load-bearing structure.

[0025] Further optimization of the design resulted in a steel pipe pile 1 with a diameter of 6-10m. The steel pipe pile 1 bears the main axial pressure, bending moment, and shear force, and together with the surrounding soil, forms a lateral resistance bearing system, serving as the main external bearing structure of the pile.

[0026] A construction method for a composite steel pipe monopile filled with recycled building material 3 includes the following steps: S1. Complete the single pile driving construction of steel pipe pile body 1 to make it reach the design elevation; S2. Detect the height of the soil plug inside the steel pipe pile 1 and level the surface of the soil plug; S3. An interface connection mechanism 4 is arranged on the inner wall of the steel pipe pile 1; S4. The treated recycled building materials 3 are filled into the interior of the steel pipe pile 1 in layers; S5. Control the filling height according to requirements to form a full-length or segmented filling structure; S6. A sealing mechanism 5 is installed at the top of the steel pipe pile 1 to improve the internal service environment and the overall bending strength of the steel pipe pile 1.

[0027] To further optimize the scheme, the recycled building material 3 in step S4 undergoes crushing, screening, and gradation optimization treatment in sequence.

[0028] Further optimization of the scheme reveals that under horizontal load, steel pipe pile 1 undergoes bending deformation: steel pipe pile 1 bears tensile and compressive stresses; the internal infill acts as a compression core zone, participating in the stress distribution of the section; the interface connection structure transmits interfacial shear force, ensuring the overall coordinated operation of the composite section; simultaneously, the infill increases the pile's mass and alters its mass distribution, contributing to improved structural dynamic response characteristics. Through these mechanisms, the overall bending stiffness and deformation resistance of the pile are enhanced. The bending stiffness of the composite section can be expressed as... in, , The elastic modulus and moment of inertia of the steel pipe section; , The equivalent elastic modulus and moment of inertia of the infill; , This is the conversion term for the interface collaboration coefficient.

[0029] To further optimize the scheme, in step S4, each layer of recycled building material 3 is compacted or vibrated to achieve density.

[0030] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0031] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A composite steel pipe monopile filled with recycled building materials, characterized in that: The steel pipe pile body (1) includes a cavity (2) inside the steel pipe pile body (1), the cavity (2) is used to fill recycled building materials (3), the cavity (2) is provided with multiple interface connection mechanisms (4), and the top surface of the steel pipe pile body (1) is provided with a sealing mechanism (5).

2. The composite steel pipe monopile based on recycled building materials as described in claim 1, characterized in that: The recycled building materials (3) include waste concrete blocks and bricks.

3. The composite steel pipe monopile based on recycled building materials as described in claim 1, characterized in that: The interface connection mechanism (4) is a shear connector installed in the cavity (2).

4. The composite steel pipe monopile based on recycled building materials as described in claim 1, characterized in that: The diameter of the steel pipe pile (1) is 6-10m.

5. A construction method for a composite steel pipe monopile filled with recycled building materials, based on the composite steel pipe monopile filled with recycled building materials as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Complete the single pile driving construction of the steel pipe pile body (1) to make it reach the design elevation; S2. Detect the height of the soil plug inside the steel pipe pile (1) and level the surface of the soil plug; S3. An interface connection mechanism (4) is arranged on the inner wall of the steel pipe pile (1). S4. The treated recycled building materials (3) are filled into the interior of the steel pipe pile (1) in layers; S5. Control the filling height according to requirements to form a full-length or segmented filling structure; S6. A sealing mechanism (5) is installed on the top of the steel pipe pile (1) to improve the internal service environment and the overall bending strength of the steel pipe pile (1).

6. The construction method for composite steel pipe monopiles based on recycled building materials as described in claim 5, characterized in that: The recycled building material (3) in step S4 is subjected to crushing, screening and gradation optimization treatment in sequence.

7. The construction method for composite steel pipe monopiles based on recycled building materials as described in claim 5, characterized in that: The bending stiffness of the composite section can be expressed as: in, , The elastic modulus and moment of inertia of the steel pipe section; , The equivalent elastic modulus and moment of inertia of the infill; , This is the conversion term for the interface collaboration coefficient.

8. The construction method for composite steel pipe monopiles based on recycled building materials as described in claim 5, characterized in that: In step S4, the recycled building materials (3) of each layer are compacted or vibrated to achieve a denser finish.

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