CN204212174U - Single pile adds taper pile brace type offshore wind turbine foundation structure - Google Patents

Abstract

The utility model relates to a foundation structure of an offshore fan supported by single piles and inclined piles. The purpose of this utility model is to provide a single pile plus inclined pile support type offshore wind turbine foundation structure. Small diameter inclined piles are set to assist in increasing the horizontal bearing capacity of the overall structure, reducing the weight and diameter of the central single pile steel pipe pile, and reducing the number of offshore steel pipes. Difficulty in making piles. The technical scheme of the utility model is: a single pile plus inclined pile supporting type offshore fan foundation structure, which has a single pile steel pipe pile and an upper flange connection section connected by an upper and lower flange, and the upper and lower flanges are connected by high-strength bolts Tightening connection, characterized in that: the flange connection section is welded as a whole with a set of connection sleeves through a closed connection tube type connection piece, and the connection sleeve guides the corresponding inclined pipe pile to be piled obliquely to the design elevation, and adopts The grouting is connected with the inclined pipe pile as a whole. The utility model is suitable for the technical field of offshore wind power engineering.

Description

Single pile plus inclined pile supported offshore wind turbine foundation structure

technical field

The utility model relates to a foundation structure of an offshore fan supported by a single pile plus an inclined pile, belonging to the technical field of offshore wind power engineering.

Background technique

At present, as the simplest type of offshore wind turbine foundation, monopile foundation is the dominant type of foundation structure in European offshore wind farms, accounting for about 70% of the built offshore wind farms. The single pile foundation is usually composed of a single large-diameter (above 4m) steel pipe. The lower part is deep into the soil to provide bearing capacity; the middle part is immersed in water to withstand long-term cycles such as waves, ocean currents, and tides; the upper part is welded to flanges through connecting sections or direct methods Connected to the wind tower. With the improvement of domestic pile making technology, piling equipment, and pile sinking capacity, the application of single pile foundation in the construction of offshore wind farms in my country will also become more and more extensive.

In order to save costs, offshore wind power projects often use higher-power wind turbines, and the upper wind turbine load is relatively large, and the shallow surface layer in domestic coastal areas is mostly silty soft soil, and the diameter of the single pile foundation is often large, which makes pile sinking more difficult , the conventional offshore monopile foundation construction equipment cannot meet the construction requirements.

Contents of the invention

The technical problem to be solved by the utility model is to provide a single pile plus inclined pile supporting type offshore wind turbine foundation structure in view of the above-mentioned problems, setting small diameter inclined piles to assist in increasing the horizontal bearing capacity of the overall structure, and reducing the central single pile steel pipe Pile weight and diameter, reducing the construction difficulty of offshore steel pipe piles.

The technical solution adopted by the utility model is: a single pile plus inclined pile supporting type offshore wind turbine foundation structure, which has a single pile steel pipe pile and an upper flange connection section connected by an upper and lower flange, and the upper and lower flanges are connected by a The high-strength bolt tightening connection is characterized in that: the flange connection section is welded as a whole with a group of connection sleeves through a closed connection tube type connection piece, and the connection sleeve guides the corresponding inclined pipe pile to be piled obliquely to the design elevation, And use grouting and inclined pipe pile connection as a whole.

The diameter of the single steel pipe pile Wall thickness 40 ~ 80mm; connecting sleeve diameter Wall thickness 30-40mm; diameter of inclined pipe pile The wall thickness is 20-30mm, and it forms an α angle of 10-50° with the single pile steel pipe pile.

The pile top elevation of the single steel pipe pile is set at 2-3m above the mean sea level.

The beneficial effects of the utility model are: using inclined pipe piles with smaller diameters to assist single pile steel pipe piles increases the horizontal stiffness of the structure and solves the problem of excessive diameter of the single pile foundation structure caused by the large thickness of shallow surface silt soft soil. The construction equipment cannot meet the construction requirements and other problems.

Description of drawings

Fig. 1 is an elevation view of the utility model, which is a connection arrangement diagram of a single pile steel pipe pile, a flange connection section and an inclined pipe pile.

Fig. 2 is the top view of the I-I plane of the present utility model, which is a plane layout diagram of inclined pipe piles and single pile steel pipe piles.

Detailed ways

As shown in Figures 1 and 2, this embodiment is a single-pile plus inclined pile-supported offshore wind turbine foundation structure applied to offshore wind turbines, including single-pile steel pipe piles 1 and connected by upper flange 3 and lower flange 4 The upper flange is connected to the section 2, and the upper and lower flanges are tightened and connected by high-strength bolts 5 . The flange connection section 2 is integrally welded with the connecting sleeve 7 through the connecting piece 6 , and the connecting sleeve is connected with the inclined pipe pile 8 as a whole by grouting 9 . Among them, the diameter of single steel pipe pile 1 Wall thickness 40 ~ 80mm; connecting sleeve 7 diameters Wall thickness 30 ~ 40mm; inclined pipe pile 8 diameter The wall thickness is 20-30mm. The single steel pipe pile 1 and the lower flange 4 are processed and welded in the factory, and the upper flange connection section 2 and the upper flange 3 are processed and welded in the factory.

During construction, the single-pile steel pipe pile 1 is piled to the design elevation first. After the pile sinking is completed, the upper flange connection section 2 is installed; The pipe 7 and the upper flange connection section 2 are welded as a whole, and are used to guide the pile sinking construction of the inclined pipe pile 8; The pile 8 and the connecting sleeve 7 are connected as a whole; the diameter of the inclined pipe pile 8 is small, the pile length is long, and it forms an angle α with the single pile steel pipe pile 1, and the range is within 10-50°. The pile diameter and pile length pass through The calculation is OK.

This embodiment requires that the diameter of the inclined pipe pile 8, the length of the pile and the angle between the single pile steel pipe pile 1 be determined according to the piling capacity of the construction unit before implementation, and the collision between the inclined pipe pile 8 and the top of the upper flange connection section 2 should be avoided during design. ; and the pile top elevation of the single steel pipe pile 1 is set at 2-3m above the mean sea level, which is convenient for the hoisting construction and installation operation of the upper flange connection section.

Claims (3)

1. A foundation structure for offshore wind turbines supported by single piles and inclined piles, comprising a single steel pipe pile (1) and an upper flange connection section (2) connected by an upper flange (3) and a lower flange (4) , and the upper and lower flanges are tightly connected by high-strength bolts (5), characterized in that: the flange connection section (2) is welded to a set of connection sleeves (7) through a closed connection pipe-type connector (6) As a whole, the connecting sleeve guides the corresponding inclined pipe pile (8) to be driven obliquely to the design elevation, and the grouting (9) is used to connect the inclined pipe pile (8) to form a whole. 2. According to claim 1, said single pile plus inclined pile supporting type offshore wind turbine foundation structure is characterized in that: said single pile steel pipe pile (1) has a diameter of Wall thickness 40 ~ 80mm; connecting sleeve (7) diameter Wall thickness 30-40mm; diameter of inclined pipe pile (8) The wall thickness is 20-30 mm, and forms an α angle of 10-50° with the single steel pipe pile (1). 3. According to claim 1, said single pile plus inclined pile supporting type offshore wind turbine foundation structure is characterized in that: the pile top elevation of said single steel pipe pile (1) is set at 2-3m above mean sea level.