CN201599158U - Multi-pile steel frame offshore wind turbine foundation structure with central pile - Google Patents

Abstract

The utility model relates to a multi-stake steel framework maritime wind turbine infrastructure with a central stake. In order to solve technical problems, the utility model provides the multi-stake steel framework maritime wind turbine infrastructure with the central stake, which is suitable for offshore and intertidal belt sea area, and has the characteristics of cheapness, reliability, quick-speed construction and simplity and convenience. In order to solve the technical problems, the utility model adopts the technical scheme that the infrastructure adopts an integral steel framework with four to seven stakes, and comprises peripheral steel bushing pipes vertically arranged and a central connection section steel pipe; the steel pipe stake is fixedly connected inside the steel bushing pipes; a steel pipe stake is also fixedly connected to the bottom of the connection section steel pipe; the lower end of the steel pipe stake stretches into a bearing stratum below the sea bed; and the steel bushing pipes are connected with the connection section steel pipe through an oblique upper steel pipe and a horizontal lower steel pipe; in addition, the horizontal steel pipe is connected among the steel bushing pipes in the horizontal direction, and the upper end of the connection section steel pipe is fixedly connected with a stepped drum through a flange. The utility model can be used for maritime wind power generation.

Description

Multi-pile steel frame offshore wind turbine foundation structure with central pile

technical field

The utility model relates to a foundation structure of a multi-pile steel frame offshore wind power unit with central piles, and belongs to the technical field of civil engineering in the offshore wind power generation industry.

Background technique

In my country, the wind power industry is a new industry. Since the 1980s, my country has introduced foreign technology and gradually built wind power plants in China. After 2000, the domestic wind power industry has developed rapidly due to the country's encouragement of the development and utilization of renewable energy.

So far, my country has built a large number of onshore wind farms in Inner Mongolia, Xinjiang, Hebei and the eastern coastal areas. However, with the large-scale development of the wind power industry, problems such as shortage of land resources and conflicts with other local industries have gradually emerged. my country has a long coastline, and the sea area is rich in wind energy resources. In recent years, offshore wind power has been rapidly developed. develop.

Due to the particularity of the natural environment at sea, ordinary land construction machinery and construction methods cannot be used, and the foundation structure of conventional land wind turbines is not convenient for use at sea. The foundation of offshore wind turbines needs to solve a series of problems such as tide-proof, anti-wave, weak foundation, seawater corrosion, and rapid construction. Due to the lack of experience in the construction of offshore wind farms, a cheap and reliable foundation solution has not yet been found. The conventional concrete cap pouring method requires a lot of offshore construction work, is greatly affected by the weather, and has a long construction period. Especially for the intertidal sea area along the southeast coast, it is difficult for traditional land and offshore equipment to enter the site, and the seabed surface has frequent tidal fluctuations, and the time available for construction operations is shorter.

Contents of the invention

The technical problem to be solved by the utility model is: based on the coastal and intertidal environmental conditions of our country, to provide a multi-pile steel frame offshore wind turbine foundation structure with central piles suitable for offshore and intertidal sea areas, with low cost , Reliable, fast and easy construction.

The technical scheme adopted by the utility model is: the foundation structure of the multi-pile steel frame offshore wind turbine with central piles, which is characterized in that: the foundation structure is an integral steel frame structure of 4 to 7 piles, including vertically arranged peripheral steel structures. The casing and the steel pipe in the central connection section, the steel casing is consolidated and connected to the steel pipe pile, and the bottom of the steel pipe in the connection section is also fixedly connected to a steel pipe pile, and the lower end of the steel pipe pile extends into the bearing layer below the seabed; the steel casing The pipe is connected to the steel pipe in the connection section through the oblique upper steel pipe and the horizontal lower steel pipe. In addition, a horizontal steel pipe is connected in the horizontal direction between the steel sleeves; the upper end of the steel pipe in the connection section is fixedly connected to the tower through a flange.

The steel casing and the steel pipe pile are bonded and fixed by grouting material.

The steel pipes of the connecting section can be designed according to equal pipe diameter or variable pipe diameter, and the diameter is 4000~5000mm, the top surface is higher than the highest tide level. An inspection platform is arranged on the top of the steel pipe of the connecting section.

800～2700mm；上部钢管的直径为

600～2200mm；The diameter of the steel pipe pile is

800～2700mm; the diameter of the upper steel pipe is

600～2200mm;

500～1600mm；水平钢管的直径为

400～1400mm。The diameter of the lower steel tube is

500～1600mm; the diameter of the horizontal steel pipe is

400～1400mm.

The beneficial effects of the utility model are: (1) the steel frame is prefabricated in the factory, the quality is easy to guarantee, and the overall installation is adopted, the offshore operation is small and the operation time is short; (2) 4 to 7 steel pipe piles are driven into a single foundation, It is arranged in a combination of the center and the periphery, with uniform force and good stability. The existing domestic equipment is used for pile sinking, and the construction technology is mature; (3) The steel structure is composed of circular steel pipes, and the wave force is small, especially for offshore waters , the steel frame is located underwater, and the area with a large wave load is only a single steel pipe, which can greatly reduce the effect of wave pressure; (4) The steel pipe pile and the connecting section are connected by grouting materials, which is easy to construct and can Adapt to on-site construction errors; (5) The foundation is an all-steel structure, combined with sacrificial anode cathodic protection and coating protection anti-corrosion measures, the construction technology is mature, and the quality is easy to guarantee.

Description of drawings

Fig. 1 is the elevation view that the utility model is applied in offshore or intertidal zone sea area.

Fig. 2 is the plan view that embodiment 1 (4 piles) of the present invention is applied to offshore or intertidal zone sea area.

Fig. 3 is the plan view that the utility model embodiment 2 (5 piles) is applied in offshore or intertidal zone sea area.

Fig. 4 is the plan view that embodiment 3 (6 piles) of the present invention is applied in offshore or intertidal zone sea area.

Fig. 5 is a plan view of application of embodiment 4 (7 piles) of the present utility model in offshore or intertidal sea areas.

Detailed ways

(1) Embodiment 1:

2100mm，钢管桩下端打入至海床以下持力层，桩长需根据风电机组基础所处的地质与水文条件、风电机组的大小而定。钢套管2与连接段钢管6之间，焊有3根直径为1600mm的斜撑的上部钢管3，并焊有3根直径为

1300mm的下部钢管4，下部钢管4可根据需要设置为斜撑或水平向，本例按水平向设计。此外，钢套管2之间有3根直径为

1000mm的水平钢管5焊接相连。下部钢管4和上部钢管3的里端均与中间竖直的连接段钢管6焊接固定，连接段钢管的上端通过法兰与塔筒8固定连接。As shown in Figure 1 and Figure 2, this example is a 4-pile steel frame foundation structure applied to offshore wind turbines, which includes 3 vertical steel casings 2 arranged in an equilateral triangle, and the distance between adjacent casings is 18000mm , which is a steel pipe pile 1 that is bonded and fixed with the steel casing through grouting materials. In the center of the foundation structure is a vertically arranged steel pipe 6 of equal or variable diameter connecting section, the bottom of which is also fixedly connected to a steel pipe pile 1, and the connection methods include bolt connection, grouting connection or welding, etc. For steel pipes with large diameters and equal diameters, strengthening and fixing parts must be installed at the connection position. The diameter of steel pipe pile 1 in this example is

2100mm, the lower end of the steel pipe pile is driven into the bearing layer below the seabed. The pile length needs to be determined according to the geological and hydrological conditions of the wind turbine foundation and the size of the wind turbine. Between the steel casing 2 and the connecting section steel pipe 6, there are 3 diameters welded The upper steel pipe 3 of the 1600mm diagonal bracing is welded with 3 steel pipes with a diameter of

The lower steel pipe 4 of 1300mm, the lower steel pipe 4 can be set as a diagonal brace or a horizontal direction as required, and this example is designed according to the horizontal direction. In addition, there are 3 diameters between the steel sleeves 2

1000mm horizontal steel pipes 5 are connected by welding. The inner ends of the lower steel pipe 4 and the upper steel pipe 3 are welded and fixed with the vertical connection section steel pipe 6 in the middle, and the upper end of the connection section steel pipe is fixedly connected with the tower tube 8 by the flange.

4300，连接段钢管的顶面应高于最高潮位，以保证风电机组的电气设备不受海浪影响。连接段钢管的顶部设置检修平台7，检修平台用于运行期维护和检修。Figure 1 is a large-diameter connecting section of pipe steel 6 designed according to equal pipe diameters.

4300, the top surface of the steel pipe in the connecting section should be higher than the highest tide level to ensure that the electrical equipment of the wind turbine is not affected by the waves. An overhaul platform 7 is arranged on the top of the steel pipe in the connecting section, and the overhaul platform is used for maintenance and overhaul during operation.

The steel frame and the steel pipe pile 1 of this embodiment are processed and manufactured in a factory as a whole, and after being transported to the site, the steel frame is integrally installed by lifting equipment, and the steel pipe pile is driven by a piling ship. According to the water depth, the steel frame can be installed first, and after the leveling is completed, piles can be driven along the position of the steel casing; the piles can also be driven first, and then the steel frame is integrally socketed on the steel pipe pile, and then leveled. The gap between the steel casing and the steel pipe pile is filled with grouting material. After the grouting material is solidified, the steel pipe pile and the connecting cylinder are firmly bonded together.

(2) Embodiment 2:

1400mm的斜撑的上部钢管3，并焊有4根直径为

1200mm的水平的下部钢管4。钢套管2之间有4根直径为

800mm的水平钢管5焊接相连。As shown in Figure 1 and Figure 3, this example is a 5-pile steel frame foundation structure applied to offshore wind turbines, which includes 4 vertical steel casings 2 arranged in a square, with a distance of The steel pipe pile 1 is bonded and fixed by grouting materials in the four steel sleeves, and the bottom of the steel pipe 6 in the connecting section in the center of the foundation structure is also fixedly connected to a steel pipe pile by bolts, grouting or welding. The diameter of the steel pipe pile is 1700mm, the lower end of the steel pipe pile is driven into the bearing layer below the seabed. Between the steel casing 2 and the connecting section steel pipe 6, there are 4 diameters welded

The upper steel pipe 3 of the 1400mm diagonal bracing is welded with 4 steel pipes with a diameter of

1200mm horizontal lower steel pipe 4. There are 4 diameters between the steel sleeves 2

The horizontal steel pipe 5 of 800mm is connected by welding.

The rest of the structure and construction methods are the same as in Example 1, and will not be described again.

(3) Embodiment 3:

1300mm，钢管桩下端打入至海床以下持力层。钢套管2与连接段钢管6之间，焊有5根直径为

1200mm的上部钢管3，并焊有5根直径为

1000mm的下部钢管4。钢套管2之间有5根直径为700mm的水平钢管5焊接相连。As shown in Figure 1 and Figure 4, this example is a 6-pile steel frame foundation structure applied to offshore wind turbines, arranged in a pentagonal shape, with 5 vertical steel casings 2 on the periphery, and the distance between adjacent casings is 12000mm , the steel pipe pile 1 is bonded and fixed by grouting material in each steel casing, and a steel pipe pile is also consolidated and connected to the bottom of the steel pipe 6 in the central connection section of the foundation structure. The diameter of the steel pipe pile is

1300mm, the lower end of the steel pipe pile is driven into the bearing layer below the seabed. Between the steel casing 2 and the connecting section steel pipe 6, 5 diameters are welded

1200mm upper steel pipe 3, and welded with 5 diameters

The lower steel pipe 4 of 1000mm. There are 5 diameters between the steel sleeves 2 The horizontal steel pipe 5 of 700mm is connected by welding.

The rest of the structure and construction methods are the same as in Example 1, and will not be described again.

(4) Embodiment 4

900mm的上部钢管3，并焊有6根直径为

700mm的下部钢管4。钢套管2之间有6根直径为

600mm的水平钢管5焊接相连。As shown in Figure 1 and Figure 5, this example is a 7-pile steel frame foundation structure applied to offshore wind turbines, arranged in a hexagonal shape, with 6 vertical steel casings 2 on the periphery, and the distance between adjacent casings is 10000mm , each steel casing is bonded and fixed to the steel pipe pile 1 by grouting material, and a steel pipe pile is also consolidated and connected to the bottom of the steel pipe 6 in the central connection section of the foundation structure. The diameter of the steel pipe pile is 1100mm, the lower end of the steel pipe pile is driven into the bearing layer below the seabed. Between the steel casing 2 and the connecting section steel pipe 6, there are 6 steel tubes with a diameter of

900mm upper steel pipe 3, and welded with 6 diameters

700mm lower steel pipe 4. There are 6 diameters between the steel sleeves 2

The horizontal steel pipe 5 of 600mm is connected by welding.

The rest of the structure and construction methods are the same as in Example 1, and will not be described again.

The utility model is used for the basic structure of offshore wind turbines with a unit capacity of 1.5-6.0MW. The above four embodiments are mainly proposed for the load of 2.0MW wind turbines. The relevant dimensions can also be based on actual seabed geology, ocean hydrology conditions, and construction. Ability etc. have been adjusted. After adopting this structure, the wind turbine foundation can adapt to the sea environment at a depth of 0-30m, the uneven settlement and horizontal displacement of the foundation can be effectively controlled, and the offshore construction workload is small, the weather is less affected, the construction quality is easy to guarantee, and the cost is relatively low. Low and short construction period.

Claims (8)

1. many steel framework offshore wind farm unit fondational structures with Center stake, it is characterized in that: described fondational structure is 4～7 whole steel frame constructions, comprise the Steel Sleeve (2) of the periphery of vertical setting and the linkage section steel pipe (6) of central authorities, fixed connection steel pipe pile (1) in the described Steel Sleeve (2), linkage section steel pipe (6) bottom also fixedly connected 1 steel pipe pile (1), the steel pipe pile lower end stretches to the following supporting course of sea bed; Steel Sleeve (2) by oblique top steel pipe (3) and level to bottom steel pipe (4) link to each other with linkage section steel pipe (6), in addition, be connected with horizontal steel tube (5) between the Steel Sleeve (2) in the horizontal direction; Fixedly connected with tower tube (8) by flange in the upper end of described linkage section steel pipe (6).

2. many steel framework offshore wind farm unit fondational structures with Center stake according to claim 1 is characterized in that: fixing by the grouting material bonding between described Steel Sleeve (2) and the steel pipe pile (1).

3. many steel framework offshore wind farm unit fondational structures with Center stake according to claim 1 is characterized in that: described linkage section steel pipe (6) is for waiting caliber or becoming caliber, and diameter is

4000～5000mm, its end face is higher than highest water level.

4. many steel framework offshore wind farm unit fondational structures with Center stake according to claim 3, it is characterized in that: the top of described linkage section steel pipe (6) is provided with inspection platform (7).

5. many steel framework offshore wind farm unit fondational structures with Center stake according to claim 1 and 2, it is characterized in that: the diameter of described steel pipe pile (1) is

800～2700mm.

6. many steel framework offshore wind farm unit fondational structures with Center stake according to claim 1 and 2, it is characterized in that: the diameter of described top steel pipe (3) is

600～2200mm.

7. many steel framework offshore wind farm unit fondational structures with Center stake according to claim 1 and 2, it is characterized in that: the diameter of described bottom steel pipe (4) is

500～1600mm.

8. many steel framework offshore wind farm unit fondational structures with Center stake according to claim 1 and 2, it is characterized in that: the diameter of described horizontal steel tube (5) is

400～1400mm.

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