Power transmission tower foundation structure for wind power plant current collection line construction

Abstract

The utility model relates to the technical field of power transmission towers, and discloses a power transmission tower foundation structure for construction of a current collection line of a wind power plant, which comprises a steel pipe pile and an arranged flange plate, and a stiffening plate is mounted at the bottom of the flange plate; a gasket and a nut are additionally arranged on the surface of the bolt; and drainage holes are formed in the surface of the hole top pile casing. According to the transmission tower foundation structure for wind power plant current collection line construction, the pile foundation hole is formed in the ground, the hole top pile casing slides downwards along the inner wall of the pile foundation hole, then the steel pipe pile descends along the interior of the pile foundation hole, the steel pipe pile is inserted into an inner cavity of the hole top pile casing, and concrete is poured or soil is backfilled for tamping; an external power transmission pole is connected with the flange plate through the bolt, the gasket and the nut, water can be drained outwards through the water drainage holes, the construction period is greatly shortened, foundation construction is completed on the premise that operation of an original current collection circuit is not affected, safety and reliability of the current collection circuit are guaranteed, and economic losses caused by power failure are reduced.

Description

Technical Field

[0001] This utility model relates to the field of power transmission tower technology, specifically a power transmission tower foundation structure for wind farm collection line construction. Background Technology

[0002] A wind farm is a group of hundreds or even thousands of wind turbine generators, with individual capacities ranging from kilowatts to megawatts or more, installed in a specific array layout. The wind turbine group consists of: the main power generation unit, composed of multiple large grid-connected wind turbines, located in areas rich in wind energy resources and arranged in an orderly manner according to terrain and prevailing wind direction; the power collection line, responsible for collecting the electrical energy from each wind turbine; a step-up substation, which upgrades the electrical energy to a suitable voltage level for transmission; step-up transformers and reactive power compensation devices, ensuring stable power transmission; reactive power compensation devices may include capacitors, reactors, static var compensators, and filters; and a wind farm management system, which provides intelligent management of the wind farm. Transmission towers are required during the construction of the wind farm's power collection lines, primarily to support conductors and lightning protection wires, ensuring they maintain sufficient safe distances from the ground and other structures.

[0003] Traditional transmission tower foundation structures for wind farm collector line construction are often problematic. During the "large-to-small" electrical system upgrades of older wind farms, the existing lines are built for smaller turbines, and the current-carrying capacity of the circuit conductors cannot meet the power transmission needs of larger turbines. This compromises the safety of the original tower structure and foundation after conductor replacement. In practice, old wind farm upgrade projects often use bored pile foundations, which are long and involve lengthy construction periods, resulting in significant economic losses due to power outages caused by construction. Therefore, this paper proposes a new transmission tower foundation structure for wind farm collector line construction. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a transmission tower foundation structure for wind farm power collection line construction, thereby solving the aforementioned technical problems of increased construction difficulty and cost, and reduced line stability and safety.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a transmission tower foundation structure for wind farm collector line construction, comprising:

[0008] Steel pipe piles, and flanges installed on top of the steel pipe piles, with stiffening plates installed at the bottom of the flanges;

[0009] Bolts are installed on the top of the flange, and each bolt surface is equipped with a washer and a nut.

[0010] The top casing is installed on the surface of the steel pipe pile, and the surface of the top casing has drainage holes. Reinforcing bars are added to the inner cavity of the top casing, and the reinforcing bars are composed of transverse bars and longitudinal bars. By drilling pile foundation holes in the ground, the top casing is first slid down along the inner wall of the pile foundation hole, and then the steel pipe pile is lowered down into the pile foundation hole, so that the steel pipe pile is inserted into the inner cavity of the top casing. Concrete is then poured or backfilled and compacted. The external power transmission pole is then connected to the flange using bolts, washers, and nuts. In rainy weather, drainage can be carried out through the drainage hole. The steel reinforcement composed of horizontal and longitudinal bars can improve the tensile strength and overall stability of the concrete top casing. Since this structure is used in conjunction with the power transmission pole, after the pile foundation hole is excavated, the steel pipe pile can be directly driven into the pile foundation hole, and concrete is poured or backfilled and compacted, ensuring the foundation strength and greatly shortening the construction period. The foundation construction is completed without affecting the operation of the original power collection line. Then, the structure is connected to the upper cement pole or steel pipe pole with bolts, ensuring the safety and reliability of the power collection line and reducing the economic losses caused by power outages.

[0011] Preferably, the steel pipe pile is composed of multiple pile segments, and there are six to nine sets of these segments. The number of pile segments can be increased or decreased according to the site conditions to suit different environments, thereby improving the applicability of this structure.

[0012] Preferably, the top of the multi-segment pile is equipped with an outwardly protruding plate, and the bottom of the multi-segment pile is provided with an inner groove. When adjacent multi-segment piles are connected, the outwardly protruding plate enters the interior of the inner groove.

[0013] Preferably, the surfaces of the outer convex plate and the inner groove are respectively provided with external threads and internal threads, and the outer convex plate and the inner groove are threadedly connected. When the outer convex plate contacts the inner groove, it rotates to allow the outer convex plate to rotate into the interior of the inner groove, which not only ensures the connection stability between adjacent pile segments, but also facilitates disassembly and assembly operations.

[0014] Preferably, the borehole top casing is integrally sawtooth-shaped. This increases the contact area between the steel pipe pile and the soil, thereby increasing the lateral friction resistance between the steel pipe pile and the soil, and improving the foundation bearing capacity.

[0015] Preferably, the transverse and longitudinal ribs are oriented differently and are staggered. The staggered arrangement of the transverse and longitudinal ribs forms a spatial grid structure, which can more effectively resist loads from all directions and significantly improve the overall stability and load-bearing capacity of the borehole casing.

[0016] Preferably, the inner cross-section of the drain hole is circular, and the entire drain hole is designed to be inclined. This facilitates the draining operation through the drain hole.

[0017] Preferably, the flange is an overall ring-shaped design, and the bolts are located at the top of the flange. The bolts are connected to the corresponding structure on the flange.

[0018] Preferably, the bolt and the washer are sleeved together, and the bolt and the nut are threaded together. The bolt, through the washer and the nut, ensures the stability of the connection with the corresponding structure.

[0019] Preferably, the number of stiffening plates is ten to thirty sets, and the stiffening plates are evenly distributed on the bottom of the flange. The stiffening plates enhance the overall support of the flange.

[0020] (III) Beneficial Effects

[0021] Compared with the prior art, this utility model provides a foundation structure for transmission towers used in the construction of wind farm power collection lines, which has the following advantages:

[0022] The foundation structure for the transmission towers used in the construction of the wind farm's collector lines involves drilling pile foundation holes in the ground, first lowering the top casing along the inner wall of the hole, then lowering the steel pipe piles into the inner cavity of the top casing, and finally pouring concrete or backfilling and compacting the soil. The external transmission poles are then connected to the flanges using bolts, washers, and nuts. During rainy weather, drainage holes allow water to flow out. The reinforcing steel, composed of horizontal and vertical bars, enhances the tensile strength and overall stability of the concrete top casing. Because this structure is used in conjunction with the transmission poles, after the pile foundation holes are excavated, the steel pipe piles can be directly driven into the holes, followed by pouring concrete or backfilling and compacting the soil, ensuring the foundation strength. This significantly shortens the construction cycle. Foundation construction is completed without affecting the operation of the original power collection lines. The structure is then connected to the upper cement or steel pipe poles using bolts, ensuring the safety and reliability of the power collection lines and reducing economic losses from power outages. It is suitable for various geological conditions and power transmission needs, meeting the diverse requirements for upgrading the electrical systems of aging wind farms. Modular design and standardized production simplify the construction process, reducing construction difficulty and cost. The use of reinforced concrete borehole top casings as support structures minimizes disturbance to the existing transmission tower foundations from newly excavated foundations, further shortening the construction cycle and reducing economic losses from power outages, ensuring flexible operation of the wind farm. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a cross-sectional view of the flange structure of this utility model;

[0025] Figure 3This is a schematic diagram of the hole top protective sleeve structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the steel reinforcement structure of this utility model;

[0027] Figure 5 This is a schematic diagram of the drainage hole structure of this utility model;

[0028] Figure 6 This is a schematic diagram of the short pile body separation structure of this utility model.

[0029] In the diagram: 1. Steel pipe pile; 2. Stiffening plate; 3. Flange; 4. Bolt; 5. Top casing; 6. Drainage hole; 7. Reinforcing bar; 8. Horizontal reinforcement; 9. Longitudinal reinforcement; 10. Multi-segment pile body; 11. Outer convex plate; 12. Inner groove. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] This utility model provides a technical solution: a transmission tower foundation structure for wind farm power collection line construction, including: (See details) Figure 1 , Figure 2 , steel pipe pile 1, and flange 3 set on top of steel pipe pile 1, and stiffening plate 2 installed at the bottom of flange 3;

[0032] Bolt 4 is located on the top of flange 3, and a washer and nut are respectively added to the surface of bolt 4;

[0033] Please see Figure 3 , Figure 4 , Figure 5The top casing 5 is installed on the surface of the steel pipe pile 1, and the surface of the top casing 5 is provided with a drainage hole 6. A steel bar 7 is added to the inner cavity of the top casing 5, and the steel bar 7 is composed of a transverse bar 8 and a longitudinal bar 9. By drilling pile foundation holes in the ground, the top casing 5 is first slid down along the inner wall of the pile foundation hole, and then the steel pipe pile 1 is lowered down into the pile foundation hole, so that the steel pipe pile 1 is inserted into the inner cavity of the top casing 5. Concrete is then poured or backfilled and compacted. The external power transmission pole is then connected to the flange 3 through bolts 4, washers, and nuts. In rainy weather, drainage can be carried out through the drainage hole 6. The steel reinforcement 7, composed of horizontal reinforcement 8 and longitudinal reinforcement 9, can improve the tensile strength and overall stability of the concrete top casing 5. Since this structure is used in conjunction with the power transmission pole, after the pile foundation hole is excavated, the steel pipe pile 1 can be directly driven into the pile foundation hole, and concrete is poured or backfilled and compacted, ensuring the foundation strength and greatly shortening the construction period. The foundation construction is completed without affecting the operation of the original power collection line. Then, the structure is connected to the upper cement pole or steel pipe pole through bolts 4, ensuring the safety and reliability of the power collection line and reducing the economic losses caused by power outages.

[0034] Please see Figure 6 The steel pipe pile 1 is composed of multiple pile segments 10, with six to nine groups of segments 10. The number of segments 10 can be increased or decreased according to the site conditions to suit different environments and improve the applicability of the structure. Each segment 10 has a protruding plate 11 at its top and an inner groove 12 at its bottom. When adjacent segments 10 are connected, the protruding plate 11 enters the inner groove 12. The surfaces of the protruding plate 11 and the inner groove 12 are respectively provided with external and internal threads, and the protruding plate 11 and the inner groove 12 are threadedly connected. When the protruding plate 11 contacts the inner groove 12, it rotates, causing the protruding plate 11 to rotate into the inner groove 12, ensuring the stability of the connection between adjacent segments 10 and facilitating disassembly and assembly.

[0035] Please see Figure 3 , Figure 4 The borehole top casing 5 is serrated overall. This increases the contact area between the steel pipe pile 1 and the soil, thereby increasing the lateral friction resistance between the steel pipe pile 1 and the soil, and improving the foundation bearing capacity. The transverse reinforcement 8 and the longitudinal reinforcement 9 are oriented differently, and they intersect each other. The interlacing arrangement of the transverse reinforcement 8 and the longitudinal reinforcement 9 forms a spatial grid structure. This structure can more effectively resist loads from all directions, significantly improving the overall stability and bearing capacity of the borehole top casing 5.

[0036] Please see Figure 5 The inner cross-section of the drain hole 6 is circular, and the entire drain hole 6 is designed with an incline. This facilitates the drainage operation through the drain hole 6.

[0037] Please see Figure 1 , Figure 2 The flange 3 has an overall ring design, and bolts 4 are located on top of the flange 3. Bolts 4 connect to the corresponding structure on the flange 3 via a sleeve connection between the bolt 4 and the gasket, and are threadedly connected to the nut. The connection stability between the bolt 4 and the corresponding structure is ensured by the gasket and nut. Ten to thirty sets of stiffening plates 2 are evenly distributed at the bottom of the flange 3. The stiffening plates 2 enhance the overall support capacity of the flange 3.

[0038] This scheme involves drilling a pile foundation hole in the ground, first sliding the top casing 5 down the inner wall of the pile foundation hole, then lowering the steel pipe pile 1 down into the pile foundation hole, inserting the steel pipe pile 1 into the inner cavity of the top casing 5, and then pouring concrete or backfilling and compacting the soil. Then, the external power transmission pole is connected to the flange 3 through bolts 4, washers and nuts. In rainy weather, water can be drained out through the drainage hole 6. The number of multiple pile segments 10 used for the steel pipe pile 1 can be increased or decreased according to the site conditions. When connecting adjacent multiple pile segments 10, the outer convex plate 11 enters the interior of the inner groove 12. After the outer convex plate 11 contacts the inner groove 12, it rotates, causing the outer convex plate 11 to rotate into the interior of the inner groove 12.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foundation structure for a power transmission tower for a wind farm power collection line construction, characterized by, include: Steel pipe pile (1), and flange (3) set on top of steel pipe pile (1), and stiffening plate (2) installed at the bottom of flange (3); Bolts (4) are provided on the top of the flange (3), and washers and nuts are respectively provided on the surface of the bolts (4); A top casing (5) is installed on the surface of the steel pipe pile (1), and a drainage hole (6) is provided on the surface of the top casing (5). A reinforcing bar (7) is added to the inner cavity of the top casing (5), and the reinforcing bar (7) is composed of a transverse bar (8) and a longitudinal bar (9).

2. A foundation structure for a power transmission tower for a power collection line construction of a wind farm according to claim 1, characterized in that: The steel pipe pile (1) is composed of multiple pile segments (10), and the multiple pile segments (10) are in groups of six to nine.

3. A foundation structure for a power transmission tower for a power collection line of a wind farm according to claim 2, characterized in that: The top of the multi-segment pile body (10) is equipped with an external convex plate (11), and the bottom of the multi-segment pile body (10) is provided with an internal groove (12).

4. A foundation structure for a power transmission tower for a power collection line of a wind farm according to claim 3, characterized in that: The outer convex plate (11) and the inner groove (12) are respectively provided with external threads and internal threads, and the outer convex plate (11) and the inner groove (12) are threadedly connected.

5. A foundation structure for power transmission tower for wind farm collection line construction according to claim 1, characterized in that: The top casing (5) of the hole is serrated in shape.

6. A foundation structure for power transmission tower for wind farm collection line construction according to claim 1, characterized in that: The transverse reinforcement (8) and the longitudinal reinforcement (9) are in different directions, and the transverse reinforcement (8) and the longitudinal reinforcement (9) intersect each other.

7. A foundation structure for a power transmission tower for a power collection line of a wind farm according to claim 1, characterized in that: The inner cross-section of the drain hole (6) is circular, and the drain hole (6) is designed to be inclined.

8. A foundation structure for power transmission tower for wind farm collection line construction according to claim 1, characterized in that: The flange (3) is designed as a ring, and the bolts (4) are located on the top of the flange (3).

9. A foundation structure for power transmission tower for wind farm collection line construction according to claim 1, characterized in that: The bolt (4) is sleeved with the washer, and the bolt (4) is threaded with the nut.

10. A foundation structure for power transmission tower for wind farm collection line construction according to claim 1, characterized in that: The number of stiffening plates (2) is ten to thirty sets, and the stiffening plates (2) are evenly distributed at the bottom of the flange (3).

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