RU207608U1 - Universal modular foundation for an arctic wind turbine - Google Patents

Abstract

The utility model relates to the field of wind energy and construction, namely, to the construction of shallow foundations for wind power plants (WPPs) built for operation in harsh climatic conditions. The essence of the utility model lies in the fact that the modular foundation of the wind power plant contains the central and external modules; the central module is made in the form of a hexagonal hollow prism, and the external modules are in the form of triangular hollow prisms of the same type; the foundation is additionally equipped with an internal module, which has the shape of a hollow cylinder and contains flanges on both sides oriented towards the inside of the internal module, the flanges are equipped with mounting holes allowing for detachable connection with the wind turbine tower, while the internal module is located inside the central module coaxially with it, and the external modules form concentric hexagons around the central module, all modules have holes in the side faces for mounting, and are interconnected by means of a detachable connection. A bolted connection is used as a detachable connection, and all modules are made of steel. The technical result consists in improving the manufacturability of the structure. 2 wp f-ly, 2 dwg

Description

The utility model relates to the field of wind energy and construction, namely, to the construction of shallow foundations for wind power plants (WPPs) built for operation in harsh climatic conditions.

The known design of a shallow, tireless foundation for wind turbine towers with a capacity of 0.5 to 10 MW (patent for invention US No. 20110061321). The structure is a stable support of a wind power plant located in a pit, consisting of a central cylindrical vertical pedestal, large in area of a horizontal lower base plate with a reinforced perimeter, numerous (10-12) radials with respect to the vertical support, cylindrical or prismatic in shape, reinforced with eccentricity (above and below the zero axis) paired metal sheet piles, and pre-prepared stiffeners, and a 3-dimensional mesh of 500 steel post-stressed reinforcing structures that hold the foundation elements under a significant multiaxial load with an eccentricity designed to provide rigidity and resistance to overturning and shear ... The upper end of the foundation pedestal is equipped with means for mounting the wind turbine tower. Structurally, the invention is used in the natural conditions of Scandinavia. A design feature is the obligation to backfill to ensure greater stability. Disadvantages of the design - the complexity of connecting the elements and a significant amount of construction, installation and concrete work on the site.

The known design of a shallow ribbed foundation for towers with a height of 40-80 m and 80-120 m for wind turbines with a capacity of 0.1 to 2 MW (patent for invention CA2875927). The foundation is formed by a shallow upper reinforced concrete slab, reinforced in it by a polygonal prismatic or cylindrical pedestal, on which the tower of the wind power plant is mounted, rigidly fastened from the bottom of the slab and 10-12 reinforced concrete reinforced concrete ribs of rectangular or trapezoidal cross-section radially placed in relation to the pedestal. The specified stiffeners are pre-prepared elements that ensure the rigidity of the structure. The invention is applied by the company GESTAMP HYBRID TOWERS S.L., Spain, in the natural conditions of Scandinavia. A feature of the wind turbine foundations design is the obligatory backfilling to ensure greater stability. Disadvantages of the design - the complexity of connecting the elements and a significant amount of construction, installation and concrete work.

As the closest analogue, the design of a shallow modular foundation for a wind power plant was chosen (utility model patent RU 167022). The shallow modular foundation for the wind turbine is installed on the base and contains the N number of external modules, radially located in relation to the central module and attached to it, at the end of which the wind turbine tower is fixed with anchor bolts. Each external module is made in the form of thin-walled reinforced concrete boxes having the shape of a regular trapezoidal prism, the outer edges of which are connected by anchor bolted ties to each other and to the end faces of the central module, made in the form of a multifaceted (according to the number of external modules) hollow prism. Each foundation module is prefabricated and assembled on site forms a shallow monolithic foundation. Backfilling was used to ensure the massiveness of the foundation.

Structurally, the invention is aimed at use in the harsh natural and climatic conditions of the Arctic. A design feature is the obligation to backfill to ensure greater stability. Disadvantages - the need to develop a structure configuration for specific conditions of the bearing capacity of the soil and force interaction with a specific wind turbine, significant weight and size of modules due to the use of reinforced concrete as the main material.

The technical problem to be solved by the claimed technical solution is the unification of elements and sections of the shallow foundation for wind turbines, which will allow this design to be used for various types of wind turbines in different climatic conditions.

The solution to this technical problem is achieved due to the fact that the modular foundation of the wind power plant contains the central and external modules; the central module is made in the form of a hexagonal hollow prism, and the external modules are in the form of triangular hollow prisms of the same type; the foundation is additionally equipped with an internal module, which has the shape of a hollow cylinder and contains flanges on both sides, oriented towards the inside of the internal module, the flanges are equipped with mounting holes that provide the possibility of detachable connection with the wind turbine tower, while the internal module is located inside the central module coaxially with it, and the external modules form concentric hexagons around the central module, all modules have holes in the side faces for mounting, and are interconnected by means of a detachable connection. A bolted connection is used as a detachable connection, and all modules are made of steel.

Distinctive features of the declared utility model from the prototype are:

- structure: the foundation is made according to the universal modular principle, which allows configuring the structure for different natural and climatic operating conditions;

- reduced weight and size characteristics: the use of box-shaped steel external modules provide reduced weight and reduced dimensions of the structure;

- rigidity: the triangular shape of the external modules allows increasing the rigidity of the entire structure as a whole;

- manufacturability: the unified form of steel structural modules makes it easy to assemble the foundation of the desired configuration for a specific wind turbine.

The technical result of the claimed utility model is achieved by unifying the design of external modules. This ensures an increase in the manufacturability of the design, which makes it possible to use it for various types of wind turbines in various natural and climatic conditions.

The analysis of the state of the art did not reveal any sources of information where the technical solution of the universal modular foundation of the Arctic wind power plant would be disclosed, which allows us to conclude that the latter meets the “novelty” criterion.

The drawings attached to the description give:

- diagram of the modular foundation of the wind turbine (Fig. 1);

- the scheme of fastening the modules between themselves and the central support and internal module, at the end of which the wind turbine is mounted (Fig. 2).

A shallow modular foundation for wind turbines (Fig. 1) is mounted on the base 1 without attachment to it and contains N number of the same type of external modules 2, forming concentric hexagons around the central module 3 and the internal module 4. A tower is fixed on the upper edge of the internal module 4 Wind turbine 5 using a detachable connection, for example - bolts 6.

Each external module 2 is made in the form of a box having the shape of a triangular prism, the lateral edges of which have through holes 7 for its detachable connection with other external modules and, in the case of the first concentric row with the lateral edges of the central module 3 (Fig. 2), made in the form of a hexagonal hollow prism, which also has holes 7 for fastening.

The internal module 4 is a hollow cylinder containing flanges on both sides, oriented towards the inside of the internal module and equipped with mounting holes, allowing for detachable connection with the wind turbine tower. The bolts are threaded sequentially through the holes in the lower and upper flanges so that the threaded part of the bolt protrudes upward, providing a detachable connection with the wind turbine tower. The bolts are fixed on the lower flange using a permanent connection (for example, welding), and on the upper one using a detachable threaded connection.

Steel can be used as a material for the manufacture of all modules.

The rigidity of the structure is provided by the ribs formed when connected by detachable joints along the edges of adjacent external modules (node 9, Fig. 2.)

The complete foundation structure forms a shallow monolithic foundation. Backfilling is used to ensure the massiveness of the foundation 8.

The shallow modular foundation for the wind turbine is assembled in the following sequence: on the base 1, the central module 3 is installed, into which the indoor module 4 is lowered. The modules are connected to each other using detachable connections (for example, bolted). At the next stage, the required number of concentric rows of external modules 2 is installed, which are connected to the central module 3 and to each other using detachable connections (for example, bolted). At the next stage, after placing the foundation at the site of operation, the external modules are filled with backfill.

The utility model is a universal, technologically advanced construction of a modular type, according to the type of work related to shallow monolithic foundations, which can be used for wind turbines of various types in various climatic conditions.

Claims (3)

1. Modular foundation of a wind power plant, containing a central and external modules, characterized in that the central module is made in the form of a hexagonal hollow prism, and the external modules are in the form of triangular hollow prisms of the same type, the foundation is additionally equipped with an internal module in the form of a hollow cylinder and containing flanges on both sides, oriented towards the inside of the indoor module, the flanges are equipped with mounting holes that provide the possibility of detachable connection with the wind turbine tower, while the indoor module is located inside the central module coaxially with it, and the external modules form concentric hexagons around the central module, all modules have holes in the side faces , intended for installation, and are interconnected by means of a detachable connection. 2. The modular foundation according to claim 1, characterized in that a bolted connection is used as a detachable connection. 3. Modular foundation according to claim 1, characterized in that all modules are made of steel.

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