CN201502064U - Offshore wind turbine steel structure foundation - Google Patents

Abstract

The utility model relates to a steel structure foundation for an offshore wind turbine, which is composed of steel pipe piles and a conversion steel structure. The number of steel pipe piles is more than two, and the top of the steel pipe piles is connected with the conversion steel structure as a bearing platform. The upper part of the steel structure is equipped with fan tower columns. Steel pipe piles are straight piles or inclined piles. The transfer steel structure is a solid-belly transfer steel structure or a lattice transfer steel structure. The utility model is suitable for fan units built in shallow seas and intertidal zones, especially the fan units in intertidal zones apply the basic form, and its advantages are more prominent. The utility model has the following advantages: convenient and fast construction, the conversion steel structure can be manufactured in the factory, transported to the site for installation, the conversion steel structure and the steel pile can be connected by bolts, the welding amount on site is small, the construction speed is extremely fast, and the construction period is short. Short, low cost of construction measures; good comprehensive benefits; small wave load, which is beneficial to the structure; strong ability to resist the bending moment of the wind turbine tower column.

Description

Offshore wind turbine steel structure foundation

technical field

The utility model relates to wind power generation facilities, in particular to a steel structure foundation of an offshore fan.

Background technique

Wind power is the fastest growing green energy technology in the world. While the construction of onshore wind farms is developing rapidly, people have noticed some restrictions on the utilization of onshore wind energy, such as large land occupation and noise pollution. Offshore wind resources are abundant, and offshore wind power generation is less restricted by problems such as noise, bird impact, and electromagnetic wave interference. It does not occupy land land resources and does not involve land acquisition and other issues. Furthermore, the offshore wind speed varies little with height, so there is no need to build a very high supporting tower, thereby reducing the cost of the offshore wind power generating set. In addition, the intensity of sea turbulence is low, the friction force at sea level is small, and the fatigue load acting on the wind turbine is reduced, so the service life of the wind turbine can be extended.

Due to the above advantages, the ocean will become a rapidly developing wind power market. my country's eastern coast has a vast sea area with a water depth of less than 50m, and it is very close to the power load center (coastal economically developed power shortage area). With the development of offshore wind farm technology, wind power will surely become the sustainable development of my country's eastern coastal areas. important source of energy.

The foundation of wind turbines is an important part of the construction of offshore wind farms. At present, the foundations of wind turbines are mainly in the following two forms:

1. Steel pipe single pile foundation

The steel pipe monopile foundation is based on a single steel pipe, and the upper part is connected to the fan tower column. The diameter of the pile depends on the size of the load, generally about 3 to 5m. The depth of insertion into the seabed is related to the soil conditions, and the hydraulic hammer or vibratory hammer can penetrate into the seabed, or drill holes on the seabed.

Due to the large load transmitted by the fan to the foundation, the steel pipe single pile foundation requires a large amount of steel and high material costs; at the same time, due to the large diameter and heavy weight of a single steel pipe, special equipment is required during construction, and the construction cost is high; In addition, it is sensitive to erosion, and anti-scour protection should be done at the joint between the seabed and the foundation.

Two, multi-pile concrete foundation

The multi-pile concrete foundation is composed of multiple concrete piles or steel pipe piles and reinforced concrete caps. The upper tower column is connected with the steel embedded parts of the reinforced concrete cap. This form of foundation is generally used for wind turbine foundations on land.

The multi-pile concrete foundation uses multiple piles to resist the upper load. In addition, the proportion of concrete in the material is large. Although it can save a certain amount of material costs compared with the steel pipe single-pile foundation, when it is used for offshore wind turbine foundations, the on-site construction is extremely complicated: in order to pour concrete, it is necessary to Steel sheet piles or overall sunken barrels (cofferdams) are built around the construction site to form a closed operating space, and water is pumped continuously at the same time. It is difficult to transport the concrete to the site, and the on-site pile sinking, concrete pouring and maintenance are complicated, resulting in extremely high cost of construction measures. At the same time, the construction period is long, and the construction time of a single fan foundation is 4 to 5 months. Therefore, the comprehensive economic benefit of the multi-pile concrete scheme is not good.

Utility model content

The task of this utility model is to provide a steel structure foundation for offshore wind turbines, which is a new type of steel structure foundation suitable for offshore wind turbine foundations composed of steel pipe piles and converted steel structures, which solves the problem of the steel pipe single pile foundation and multi-pile foundation in the prior art. Problems with piled concrete foundations.

The technical solution of the utility model is as follows:

An offshore wind turbine steel structure foundation, which includes steel pipe piles, the number of the steel pipe piles is more than two, the top of the steel pipe piles is connected with a conversion steel structure as a cap, and a fan tower is installed on the upper part of the conversion steel structure column.

The steel pipe piles are straight piles.

The steel pipe piles are inclined piles.

The transfer steel structure is a solid-belly transfer steel structure.

The transfer steel structure is a lattice transfer steel structure.

The steel pipe piles are round steel pipe piles.

The steel pipe piles are square steel pipe piles.

The steel pipe piles are polygonal steel pipe piles.

The steel pipe type pile is a steel pipe concrete pile filled with concrete.

The steel pipe type pile is a hollow steel pipe concrete pile.

The steel structure foundation of the offshore fan of the utility model is composed of steel pipe piles and a conversion steel structure. This new offshore fan foundation system is suitable for fan units built in shallow seas and intertidal zones, especially for intertidal zone fan units. , its advantages are more prominent.

Compared with the existing fan foundation form, the multi-steel pipe pile plus conversion steel structure foundation system of the utility model has the following advantages:

1. The construction is convenient and fast.

The pile sinking speed of the on-site steel pile is relatively fast; the conversion steel structure can be manufactured in the factory and transported to the site for installation. The conversion steel structure and the steel piles can be connected by bolts, the amount of on-site welding is small, the construction speed is extremely fast, the construction period is short, and the cost of construction measures is low.

2. Good comprehensive benefits.

Due to the multi-pile scheme, the amount of steel used for the pile material can be greatly reduced compared with the steel pipe single pile foundation; the construction period is greatly shortened for the concrete foundation with many piles; and the cost of construction measures is greatly reduced. Therefore, in terms of comprehensive steel consumption, construction cost and construction period, the comprehensive economic benefits are good.

3. The wave load is small.

Compared with the multi-pile concrete foundation, the section of the steel structural member is small, so the wave load is correspondingly small, which is beneficial to the structure.

4. Strong ability to resist the bending moment of the fan tower column.

Compared with steel pipe single pile and multi-pile concrete foundation, the plane size of the converted steel structure is easy to be enlarged, and the distance between multiple piles is enlarged, so that this foundation form has a strong ability to resist the bending moment of the wind turbine tower .

Description of drawings

Fig. 1 is a schematic diagram of a steel structure foundation of an offshore fan of the present invention.

Fig. 2 is a schematic diagram of another embodiment of the steel structure foundation of the offshore wind turbine in Fig. 1 .

Fig. 3 is a schematic diagram of the first embodiment in the form of steel pipe piles.

Fig. 4 is a schematic diagram of a second embodiment in the form of steel pipe piles.

Fig. 5 is a schematic diagram of a third embodiment in the form of steel pipe piles.

Fig. 6 is a schematic diagram of a fourth embodiment in the form of steel pipe piles.

Fig. 7 is a schematic diagram of a fifth embodiment in the form of steel pipe piles.

Fig. 8 is a schematic diagram of the sixth embodiment in the form of steel pipe piles.

Marked in the figure:

1 is a steel pipe pile, 2 is a converted steel structure, 3 is a wind tower column, and 4 is a seabed.

Detailed ways

Embodiments of the utility model are described in detail below in conjunction with the accompanying drawings.

Referring to Fig. 1 and Fig. 2, the steel structure foundation of a kind of offshore wind turbine of the present invention is made up of steel pipe type pile 1 and conversion steel structure 2, the quantity of steel pipe type pile 1 is more than two, can be straight pile (as shown in Fig. 1 shown), can also be inclined piles (as shown in Figure 2), and can also use a combination of straight piles and inclined piles. The lower part of the steel pipe pile 1 is buried in the seabed 4 .

A transfer steel structure 2 is connected to the top of the steel pipe pile 1, and the transfer steel structure 2 may be a solid-belt transfer steel structure or a lattice transfer steel structure, which acts as a cap.

More than two steel pipe piles 1 and the connected conversion steel structure 2 form a wind turbine foundation in the form of multiple steel pipe piles plus a conversion steel structure. The fan tower column 3 is installed on the upper part of the conversion steel structure 2 . The conversion steel structure 2 can be transported to the site after being manufactured in the factory, and when the pile construction is completed, it will be connected with the pile and installed as a whole.

Referring to Fig. 3, the steel pipe pile 1 is a round steel pipe pile.

Referring to Fig. 4, the steel pipe pile 1 is a square steel pipe pile.

The above-mentioned circular and square steel pipe piles 1 are all hollow steel pipe piles. The hollow steel pipe piles can also be steel pipe piles of other shapes.

Referring to Fig. 5, the steel pipe type pile 1 is a circular steel pipe concrete pile filled with concrete.

Referring to Fig. 6, the steel pipe type pile 1 is a square steel pipe concrete pile filled with concrete.

The steel pipe concrete piles can also be steel pipe concrete piles of other shapes, such as polygonal steel pipe piles.

Referring to Fig. 7, the steel pipe pile 1 is a hollow circular steel pipe concrete pile.

Referring to Fig. 8, the steel pipe pile 1 is a hollow square steel pipe concrete pile.

The hollow concrete-filled steel pipe piles can also be hollow concrete-filled steel pipe piles of other shapes.

Of course, those skilled in the art should recognize that the above-mentioned embodiments are only used to illustrate the utility model, rather than to limit the utility model, as long as within the spirit of the utility model, the above implementation The changes and modifications of the examples will fall within the scope of the claims of the present utility model.

Claims (10)

1. offshore wind turbine steel work basis, it comprises the stake of steel pipe class, it is characterized in that, the quantity of described steel pipe class stake is more than two, connects the conversion steel work as cushion cap at the top of steel pipe class stake, on the top of conversion steel work the blower fan king-post is installed.

2. offshore wind turbine steel work according to claim 1 basis is characterized in that, the stake of described steel pipe class is straight stake.

3. offshore wind turbine steel work according to claim 1 basis is characterized in that the stake of described steel pipe class is a taper pile.

4. offshore wind turbine steel work according to claim 1 basis is characterized in that, described conversion steel work is real abdomen formula conversion steel work.

5. offshore wind turbine steel work according to claim 1 basis is characterized in that, described conversion steel work is a lattice conversion steel work.

6. offshore wind turbine steel work according to claim 1 basis is characterized in that the stake of described steel pipe class is the round steel pile tube.

7. offshore wind turbine steel work according to claim 1 basis is characterized in that the stake of described steel pipe class is the square steel pile tube.

8. offshore wind turbine steel work according to claim 1 basis is characterized in that the stake of described steel pipe class is the polygon steel pile tube.

9. offshore wind turbine steel work according to claim 1 basis is characterized in that the stake of described steel pipe class is the steel tube concrete pile of interior concrete placing.

10. offshore wind turbine steel work according to claim 1 basis is characterized in that the stake of described steel pipe class is the concrete-filled steel tubular hollow stake.

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