CN218542488U - Composite concrete-filled steel tube wind power tower with separated ribbed thin-wall hollow interlayer - Google Patents

Abstract

The utility model belongs to the technical field of wind power generation equipment, concretely relates to wind power tower. The composite concrete filled steel tube wind power tower comprises a fan, a steel tower cylinder, a composite concrete filled steel tube tower cylinder and a ground foundation from top to bottom in sequence; the steel tower barrel is connected with the composite steel pipe concrete tower barrel through a conversion device; the composite steel tube concrete tower cylinder is composed of a plurality of segments; each segment comprises an inner steel pipe and an outer steel pipe which are connected in a nested manner; concrete is poured between the inner layer steel pipe and the outer layer steel pipe; and two ends of the inner layer steel pipe and the outer layer steel pipe are respectively provided with a connecting flange. The utility model discloses a burst ribbed thin wall cavity intermediate layer double entry steel pipe concrete wind power tower through carrying out burst equipment with outer steel pipe, has both satisfied the diameter requirement of transportation, has set up stiffening rib simultaneously between steel pipe and concrete, has increased the interface bonding force of steel pipe and core concrete, has improved the bearing capacity and the ductility of pylon, delays or even avoids the local bucking of steel pipe.

Description

A sliced ribbed thin-walled hollow interlayer composite steel tube concrete wind power tower

technical field

The utility model belongs to the technical field of wind power equipment, in particular to a wind power tower.

Background technique

Wind power generation is one of the most mature new energy technologies. As the supporting structure of the wind turbine, the tower is responsible for safely and reliably transferring the load of the wind turbine to the foundation. Once damaged, it will threaten the safety of the related equipment of the entire unit. Wind power is connected to the grid After that, a single tower accident will even threaten the safe and stable operation of the entire power grid.

The wind resources in the central, eastern and southern regions of my country have the characteristics of low wind speed and large wind shear. In the process of shifting the layout of wind farms from the three north to the central, eastern and southern areas with low wind speed and high load, in order to ensure the benefits of wind power generation, it is necessary to improve the wind turbine The diameter and height of the hub can extend the duration of power generation, capture more and better wind energy resources, and thus improve the economic benefits of wind farms. Therefore, the establishment of large-scale high wind towers is an important development direction of wind power in low wind speed areas in my country.

As the height of the wind tower hub gradually increases, the diameter of the traditional steel cone tower and the hollow interlayer concrete-filled steel tube tower will exceed the transportation limit of the road. At the same time, as the height increases, the overall rigidity of the traditional steel cone tower The drop will induce bad vibration characteristics of the wind turbine. Although the mechanical properties of hollow sandwich concrete-filled steel tube members are improved to varying degrees compared with steel members, ordinary steel tube concrete and concrete members, when the steel tube wall is thin, the steel tube wall is prone to local buckling under pressure. The traditional method is to weld stiffeners on the inner wall of steel pipes, which can effectively slow down the local buckling of components, but this kind of construction process is complicated, and welding increases the residual stress of the structure.

Utility model content

The purpose of this utility model is to solve the problems existing in the traditional wind power tower structure in the prior art, and provide a new thin-walled hollow interlayer with ribs that can effectively limit the local buckling development of components, facilitate road transportation, convenient and economical construction, and have superior mechanical properties The composite steel tube concrete wind power tower can meet the requirements of high hub, large diameter and large size of wind turbines, and it is easy to manufacture and construct, and can significantly reduce construction costs.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a segmented ribbed thin-walled hollow interlayer composite steel pipe concrete wind power tower, which sequentially includes a fan, a steel tower, a composite steel pipe concrete tower and Ground foundation; wherein, the steel tower and the composite steel pipe concrete tower are connected through a conversion device; the composite steel pipe concrete tower is composed of a plurality of segments; each segment includes an inner steel pipe and an outer steel pipe connected by nesting Concrete is poured between the inner steel pipe and the outer steel pipe; the two ends of the inner steel pipe and the outer steel pipe are respectively provided with connecting flanges.

Preferably, the outer layer of steel pipes is assembled from a plurality of ribbed thin-walled steel plates, and each wall plate has stiffening ribs bent inward on both sides; the stiffening ribs are connected and fixed by bolts between adjacent wall plates .

Preferably, the thickness range of the inner steel pipe and the outer steel pipe is 10-40 mm.

Preferably, the diameter of the inner steel pipe is not more than 4.5m and smaller than the inner diameter of the outer steel pipe.

Preferably, the cross section of the inner steel pipe is circular or any polygon, and the longitudinal section is rectangular or trapezoidal.

Preferably, the cross section of the outer steel pipe is circular, and the longitudinal section is rectangular or trapezoidal.

Preferably, the diameter and thickness of the outer steel pipe remain constant or gradually decrease from bottom to top.

Preferably, a micro-expansion agent is added to the concrete grout.

Preferably, the conversion device is composed of an upper flange, a lower flange and an intermediate steel cylinder; wherein, the upper flange is connected to the lower end of the steel tower, and the lower flange is connected to the upper end of the composite steel pipe concrete tower; the lower The flange is provided with two circles of flange connection holes along the axial direction.

Preferably, the steel tower is composed of multiple segments, and the diameter of each segment is not more than 4.5m.

Compared with the prior art, the utility model has the following beneficial effects:

1. Compared with the existing steel tower and the traditional hollow interlayer concrete-filled steel pipe tower, the utility model provides a new segmented ribbed thin-walled hollow interlayer composite steel tube concrete structure, which is assembled by segmenting the outer steel tube , which not only meets the diameter requirements of transportation, but also sets stiffeners and shear keys between the steel pipe and the concrete, which increases the interface bonding force between the steel pipe and the core concrete, improves the bearing capacity and ductility of the tower, and can delay Even local buckling of the steel pipe is avoided.

2. The utility model adopts prefabricated segment assembly and hollow interlayer technology, which is convenient and fast in construction. Under the same self-weight, it can effectively reduce the amount of materials and structural self-weight, which is convenient for road transportation, and has high strength and bending stiffness. It can effectively exert the mechanical properties of the material. Reduce the difficulty of on-site construction, greatly shorten the construction period and reduce costs.

3. The lower part adopts a thin-walled thin-walled composite steel pipe concrete tower with ribs, and the upper part adopts a steel tower. Under the premise of ensuring the safe and stable operation of the wind turbine, the hub height of the wind turbine can be greatly increased, which can reach 160 meters. And above, meet the requirements of high hub and large diameter in the low wind speed area, effectively use the wind resources in the low wind speed area, and provide a new structural type for the development of super high towers in the low wind speed area.

4. The hollow interlayer concrete filled steel tube technology can effectively avoid the fatigue problem caused by the tower tube under the action of alternating stress. Due to the increase in stiffness, the natural frequency of the tower frame increases, which can effectively avoid the rotation frequency of the unit and avoid resonance.

Description of drawings

Fig. 1 is the overall elevation view of the composite steel pipe concrete wind power tower with thin-walled thin-walled thin-walled composite steel tube concrete in the embodiment of the utility model;

Fig. 2 is a structural schematic diagram of a tower section of a steel tower in an embodiment of the utility model;

Fig. 3 is the explosion diagram of the steel tower in the utility model embodiment;

Fig. 4 is a schematic structural view of a conversion device in an embodiment of the present invention;

Figure 5 is an exploded view of the conversion device in the embodiment of the present invention;

Fig. 6 is a structural schematic diagram of a section of the tower section of the composite steel pipe concrete tower in the embodiment of the utility model;

Fig. 7 is a schematic cross-sectional view of a composite steel pipe concrete tower in an embodiment of the present invention;

Figure 8 is a schematic diagram of a composite steel pipe in an embodiment of the present invention;

Fig. 9 is a schematic diagram of the outer steel pipe in the embodiment of the present invention;

Fig. 10 is a schematic diagram of a ribbed thin-walled steel plate in an embodiment of the present invention;

Figure 11 is an exploded view of the ribbed thin-walled steel plate in the embodiment of the present invention;

Fig. 12 is a schematic diagram of the inner steel pipe in the embodiment of the present invention;

Fig. 13 is the explosion diagram of the inner steel pipe in the embodiment of the utility model;

In the figure: 1-steel tower tube; 2-tower connection upper flange, 3-tower steel tube, 4-tower connection lower flange, 5-connection bolt, 6-conversion device, 7-conversion upper flange , 8-middle steel pipe, 9-conversion lower flange, 10-inner steel pipe, 11-inner upper flange, 12-steel pipe, 13-inner lower flange, 14-outer steel pipe, 15-ribbed thin-walled steel plate , 16-Split upper flange, 17-Thin-walled steel plate, 18-Split lower flange, 19-Core concrete, 20-Composite steel pipe concrete tower, 21-Composite steel pipe, 22-Fan blade, 23- Reinforced concrete foundation, 24-stiffeners.

Detailed ways

In order to facilitate the understanding of the utility model, the utility model will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present utility model are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive.

In this embodiment, an ultra-high tower wind turbine with a hub height of 180 meters is taken as an example, in which the upper 80 meters is a traditional steel tower 1, and the lower part is a new segmented hollow interlayer thin-walled belt with 5 sections each 20 meters high. Composite concrete-filled steel tube tower 20 composed of ribbed concrete. The following will describe in detail the segmented ribbed thin-walled hollow interlayer composite steel tube concrete wind power tower in this embodiment with reference to the accompanying drawings.

As shown in FIG. 1 , in this embodiment, the ultra-high tower wind turbine unit includes a fan 22 , a steel tower 1 , a conversion device 6 , a composite steel tube concrete tower 20 , and a reinforced concrete foundation 23 from top to bottom. The composite steel tube concrete tower tube 20 at the bottom of the wind power tower is composed of 5 sections of composite steel tube concrete tower tube sections with a height of 20 meters each, and the steel tower tube 1 is composed of 4 sections of traditional steel tower tube sections with a height of 20 meters each.

As shown in Figures 2 and 3, each section of the steel tower 1 is composed of an L-shaped tower connecting the upper flange 2, an L-shaped tower connecting the lower flange 4, and a tower steel pipe 3. The cylinder connection upper flange 2 and the L-shaped tower connection lower flange 4 are welded to the upper and lower ends of the tower steel tube 3 respectively. The flange is evenly opened with through holes along the axial direction, and the direction of the flange points to the inner wall of the tower. The towers of each section are connected by the tower connecting the upper flange 2, the L-shaped tower connecting the lower flange 4 and the connecting bolt 5. That is, the tower connection upper flange 2 of a certain section of the tower is connected with the tower connection lower flange 4 of the adjacent tower, and the tower connection lower flange 4 of this section of the tower is connected with the tower connection of the adjacent tower The upper flange 2 is connected, and so on. Each section of the tower is prefabricated in the factory and only needs to be connected by bolts on site to improve construction efficiency.

As shown in Fig. 4 and Fig. 5, the conversion device 6 is a transitional structure between the upper steel tower 1 and the lower composite steel tube concrete tower 20, and serves as a link between the upper and lower. The conversion device 6 is composed of an L-shaped conversion upper flange 7, an intermediate steel pipe 8 and a T-shaped conversion lower flange 9, and is an integral structure formed by integral forging. Convert the upper flange 7 and the lowermost section of the steel tower 1 to connect the lower flange 4 for connection. The lower flange 9 is provided with two rings of flange connection holes, the flange connection holes of the inner ring are connected with the inner steel pipe 10 of the composite steel pipe concrete tower tube 20, and the flange connection holes of the outer ring are connected with the outer layer of the composite steel pipe concrete tower tube 20. Layer steel pipe 14 is connected, and the connection mode all adopts the bolt connection mode.

As shown in Fig. 6, Fig. 7 and Fig. 8, the composite steel pipe concrete tower tube 20 is composed of multi-section hollow interlayer thin-walled ribbed steel pipe composite steel pipes, and each section is composed of composite steel pipes 21 and core concrete 19. The composite steel pipe 21 is formed by nesting and combining the inner steel pipe 10 and the outer steel pipe 14 . The core concrete 19 is poured in the cavity between the inner steel pipe 10 and the outer steel pipe 14 .

As shown in Fig. 9, Fig. 10 and Fig. 11, the outer layer steel pipe 14 is a split-type combined structure. In this embodiment, the outer layer steel pipe 14 is composed of four identical ribbed thin-walled steel plates 15, each The thin-walled steel plate 15 is processed and rolled by a whole steel plate, with stiffening ribs 24 on both sides. The stiffening ribs 24 are processed with two rows of through holes along the vertical direction, the thickness is the same as that of the steel pipe, and the stiffening ribs pass through the circumferential direction between each sheet. 24 vertically arranged through holes and bolts are connected. The stiffeners 24 arranged longitudinally can effectively enhance the bonding performance of the interface between the steel pipe and the core concrete, and improve the overall rigidity, bearing capacity, stability, wind and earthquake resistance, and fatigue resistance of the tower.

Each ribbed thin-walled steel plate 15 is composed of an L-shaped segmented upper flange 16 , a thin-walled steel plate 17 , an L-shaped segmented lower flange 18 , and stiffeners 24 . The sections of the outer steel pipe 14 are paired and connected through the split upper flange 16 and the split lower flange 18 at both ends of the steel pipe. The direction of the flange points to the core concrete, and the connection method is bolted.

The ribbed thin-walled steel plate 15 is prefabricated by integral forging in the factory, and only needs to be connected by bolts on site.

The cross section of the outer steel pipe 14 is circular, and the longitudinal section is rectangular or trapezoidal. When selecting the structural size of the tower, the diameter and thickness of the steel pipe can be gradually reduced from bottom to top along the height direction to form a certain taper, which can minimize the amount of materials used and achieve better structural performance and economic benefits.

As shown in Figure 12 and Figure 13, the inner steel pipe 10 is composed of an L-shaped inner upper flange 11, a steel pipe 12 and an L-shaped inner lower flange 13, and the inner upper flange 11 and the inner lower flange 13 are arranged along the axial direction. There are through holes, and the direction of the flange points to the core concrete. Each section is connected through an inner upper flange 11 and an inner lower flange 13 . The inner steel pipe 10 is integrally manufactured and processed in sections, and the upper and lower ends are welded with integral L-shaped forged flanges, which are prefabricated and processed in the factory, and only need to be connected by bolts on site. The cross-sectional shape of the inner steel pipe 10 can be circular or any polygon, and the longitudinal section can be rectangular or trapezoidal. In this embodiment, the cross-sectional shape of the inner steel pipe 10 is circular, and the longitudinal section is preferably trapezoidal.

The core concrete 19 grouting material adds micro-expansion agent to reduce the shrinkage problem during the concrete setting process. The grouting material can be ordinary concrete or high-strength concrete according to the fan power requirements. The concrete pouring process adopts layered pouring and sufficient vibration to ensure the compactness of concrete pouring Spend.

During installation, the construction is carried out by hoisting section by section from bottom to top. The steel pipes of the inner and outer layers of the bottom tower are anchored on the reinforced concrete foundation 23 through foundation anchor bolts, and then poured on site. The composite steel pipes 21 are assembled by prefabricated components on site in other sections, and then the core concrete 19 is poured in the cavity of the composite steel pipes 21, and hoisting is carried out after the core concrete pouring is completed. At the same time, in order to improve the construction efficiency, the pouring work of the composite steel pipe concrete tower tube 20 of each segment can be carried out at the same time if the on-site construction equipment and the site permit.

All the connecting bolts 5 in this embodiment need anti-corrosion treatment, and waterproof sealant needs to be applied to the joints of each section of the tower.

In this embodiment, the diameters of the inner steel pipe 10 and the upper steel tower 1 are no more than 4.5m to meet the transportation requirements of roads, and the outer steel pipe 14 can meet the transportation requirements of large diameters due to the split type. The concrete-filled steel tube tower sections are connected section by section by pouring concrete on site and then hoisting, and the centroids of the outer steel pipe and the inner steel pipe coincide. The number of composite steel tube concrete tower sections is generally 3 to 8 sections. With the increase of wind turbine power, the tower height may reach 160 meters and above. Manufacturing the tower in sections can facilitate production, transportation and installation. The thickness range of the inner steel pipe and the outer steel pipe is 10-40mm.

The high-strength concrete grouting material should have self-compacting properties, low air bubbles, micro-expansion and high fluidity at the same time, solve the shrinkage problem during the concrete setting process and ensure that the grouting material meets the relevant requirements without vibration.

Although the utility model has been specifically shown and described with reference to the exemplary examples of the utility model, those skilled in the art should understand that, without departing from the spirit and scope of the utility model defined by the claims, modifications to the utility model can be made. Various changes in patterns and details are within the protection scope of the present utility model.

Claims (10)

1. A segmented thin-walled thin-walled hollow interlayer composite steel pipe concrete wind power tower, which successively includes a wind turbine, a steel tower, a composite steel pipe concrete tower and a ground foundation from top to bottom; it is characterized in that: the steel tower and The composite steel pipe concrete tower is connected by a conversion device; the composite steel pipe concrete tower is composed of a plurality of segments; each segment includes an inner steel pipe and an outer steel pipe connected by nesting; the inner steel pipe and the outer steel pipe are connected Concrete grouting material is poured; the two ends of the inner steel pipe and the outer steel pipe are respectively provided with connecting flanges. 2. The thin-walled ribbed thin-walled hollow interlayer composite steel pipe concrete wind power tower according to claim 1, characterized in that: the outer steel pipes are assembled from a plurality of ribbed thin-walled steel plates, and each ribbed Both sides of the thin-walled steel plate have inwardly bent stiffeners; the stiffeners are connected and fixed by bolts between adjacent ribbed thin-walled steel plates. 3 . The segmented thin-walled thin-walled thin-walled composite steel pipe concrete wind power tower according to claim 1 , wherein the thickness range of the inner steel pipe and the outer steel pipe is 10-40 mm. 4. The segmented ribbed thin-wall hollow interlayer composite steel pipe concrete wind power tower according to claim 1, characterized in that: the diameter of the inner steel pipe is not more than 4.5m, and is smaller than the inner diameter of the outer steel pipe. 5. The segmented ribbed thin-wall hollow interlayer composite steel pipe concrete wind power tower according to claim 1, characterized in that: the cross section of the inner steel pipe is circular or any polygon, and the longitudinal section is rectangular or trapezoidal. 6. The thin-walled ribbed thin-walled composite steel pipe concrete wind power tower according to claim 1, characterized in that: the outer steel pipe has a circular cross section and a rectangular or trapezoidal longitudinal section. 7. The segmented thin-walled ribbed thin-wall hollow interlayer composite steel pipe concrete wind power tower according to claim 6, characterized in that: the diameter and thickness of the outer steel pipe remain unchanged or gradually decrease from bottom to top. 8. The segmented ribbed thin-wall hollow interlayer composite steel pipe concrete wind power tower according to claim 1, characterized in that: the conversion device is composed of an upper flange, a lower flange and a middle steel cylinder; wherein, the upper The flange is connected to the lower end of the steel tower, and the lower flange is connected to the upper end of the composite steel pipe concrete tower; the lower flange is a T-shaped flange, and two rings of flange connection holes are opened in the axial direction. 9. The segmented ribbed thin-walled hollow interlayer composite steel pipe concrete wind power tower according to claim 1, characterized in that: the steel tower consists of a plurality of segments, and the diameter of each segment does not exceed 4.5 m. 10. The segmented ribbed thin-wall hollow interlayer composite steel pipe concrete wind power tower according to any one of claims 1-9, characterized in that a micro-expansion agent is added to the concrete grouting material.

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