CN210887283U - Plain low-wind-speed high-mixing tower fan foundation structure - Google Patents

Abstract

Plain low wind speed high tower fan foundation structure that mixes, including CFG stake composite foundation, laid the bed course at CFG stake composite foundation, pour plain concrete bed course on the bed course, built fan installation basis on concrete bed course, fan installation basis is including being located bottom plate and the middle pier of bottommost, bottom plate and the reinforced concrete pouring structure of middle pier formula as an organic whole, bottom plate and middle pier are hollow structure, the lower part cavity is the outside decurrent inclined plane from inside to outside with the connection face of upper portion cavity, fixed mounting has ten groups of anchor backing plates of evenly distributed on the inclined plane, every group anchor backing plate is four, the anchor backing plate is the tubulose, pipe port side is provided with the grout passageway, the bellows passes from the anchor backing plate, the lower extreme of bellows passes on the grout passageway, the bellows passes the grout groove that the upper end is located the middle pier face from the reinforcing bar. The foundation has good stress and low cost.

Description

Plain low-wind-speed high-mixing tower fan foundation structure

Technical Field

The utility model relates to a wind-powered electricity generation basis, in particular to high tower fan that mixes of low wind speed in plain belongs to wind-powered electricity generation technical field.

Background

The foundation and the tower are main bearing parts of the wind generating set, connect the wind power generator with the ground, and support the wind power generator mainly capturing wind energy at an advantageous height to achieve the most economical and safe energy utilization. Besides supporting the weight of the wind driven generator, the wind driven generator also bears the wind load towards the wind driven generator and the tower and the dynamic load during the operation of the wind driven generator. The tower must also have sufficient fatigue resistance to withstand the vibration loads caused by the wind wheel, including the periodic effects of start-up and shut-down, gust changes, tower shadow effects, etc., and meet the strength, stiffness and stability requirements under various complex environmental conditions during the designed service life of the wind turbine.

Although the steel structure tower is mainly used in wind power at present, the steel structure tower has some insurmountable defects along with the development of wind power generation. As a new technology, the prestressed reinforced concrete tower cylinder mainly has the following advantages: the prestressed concrete tower drum saves steel, and has longer service life and good stability. For steel structure towers and prestressed reinforced concrete towers, because steel materials are thin and the concrete wall thickness is large, the weight of the steel structure towers is 2-3 times that of steel structure towers at the same height, along with the development of wind power technology, the capacity of a cabin and a wind power generator set and the weight of blades are gradually increased, and the prestressed tower with large weight and better stability can better support the blades, the cabin and other overhead parts; the construction and transportation mode of the prestressed concrete tower drum is more convenient, on one hand, in the production process of the tower drum, the prestressed tower drum can be prefabricated on site by adopting a construction and installation method prefabricated on site, and can be prefabricated on site by utilizing local effective resources near an installation site, so that the time and money for transportation on the road can be reduced, and the random strain can be carried out according to the conditions of the installation site, so that the installation and the construction become more convenient and economic. The steel structure is only assembled on site, and the manufacturing process is still carried out in a factory. On the other hand, in the transportation process, according to a set of towers with the height of 70 m and 80m of the current company, the average height of the subsection height is not less than 42m, and the limit height of the current bridge in China is 4.5 m, and the limit height of the bridge in China is already reached when the minimum height of the body of the transportation vehicle is 20-30 cm. If the tower barrel with the height of more than 100m is transported in sections, the height of each section is more than 4.2m, and the height of the vehicle body cannot meet the height limit requirement of a bridge, so that the problem exists in transportation; the prestressed concrete tower barrel is more beneficial from the structural point of view, the steel structure enables the structure to generate buckling deformation due to the unloading capacity, which is unfavorable for the structure, and the prestressed tower barrel structure material does not have the unloading problem due to the large rigidity. The prestressed structure has the advantages of high rigidity, good stability, good wind-resistant, earthquake-resistant and fatigue-resistant performances, high safety, relatively clear stress, short construction period, higher income and the like, so that the prestressed structure is more suitable.

The existing wind turbine foundation is mainly a wind turbine foundation in a foundation ring connection mode, in the structure, the part of a foundation ring embedded in concrete is a rigid structure, the exposed part and the whole tower barrel are flexible bodies, a stress concentration part is formed at the uppermost intersection line of the foundation ring and the concrete foundation, and if the material of the foundation ring at the part is defective or the bearing stress is overlarge, fatigue failure can be easily caused at the part. In an actually-operated wind power plant, fatigue damage of concrete on two sides of a foundation ring of a wind turbine foundation of some wind power plants occurs, the foundation ring and the concrete on the two sides directly appear as separation gaps visible to the naked eye, the foundation ring obviously shakes during the operation of the wind turbine to directly influence the safety of wind turbine equipment, and the wind power technology can be more mature and optimized by innovatively designing on the basis of the wind turbine.

Disclosure of Invention

An object of the utility model is to overcome the above-mentioned problem that exists among the present fan foundation mechanism, provide a low wind speed high tower fan foundation structure that mixes of plain.

In order to realize the purpose of the utility model, the following technical proposal is adopted: a low-wind-speed high-mixing tower fan foundation structure in plain comprises a CFG pile composite foundation, wherein the diameter of the CFG pile is 400mm, the pile spacing is 1.5-2.0m, an annular arrangement is adopted, a mattress layer with the thickness of 230 plus material and 300mm is laid on the CFG pile composite foundation, a C20 plain concrete cushion layer with the thickness of 150mm is poured on the mattress layer, a fan installation foundation integrated with the concrete cushion layer is poured on the concrete cushion layer, the fan installation foundation comprises a bottom plate and a middle pier which are positioned at the bottommost part, the bottom plate and the middle pier are of an integrated reinforced concrete pouring structure, the diameter of the middle pier is smaller than that of the bottom plate, the connecting surface between the bottom plate and the middle pier is an inclined surface which is from outside to inside, the bottom plate and the middle pier are both of a hollow structure, the diameter of a lower cavity of the hollow structure is large, the diameter of an upper cavity is small, the connecting surface between the lower cavity and the upper cavity is an inclined surface which is an inclined surface, each group of anchor backing plates are four, the radian occupied by each group of anchor backing plates is within 15 degrees, each anchor backing plate is tubular, a grouting channel is arranged on the side surface of a pipe port, the corrugated pipe penetrates through the anchor backing plates, the corrugated pipe and the anchor backing plates are sealed, the lower end of the corrugated pipe is positioned on the grouting channel, the corrugated pipe penetrates through a grouting groove with the upper end positioned on the middle pier surface from the steel bar, the corrugated pipe and the anchor backing plates form an anchor cable sleeve, and a cable pipe is arranged in the fan installation foundation in a penetrating mode.

Further, the method comprises the following steps of; the bottom plate is provided with a steel strand penetrating pipe which slants downwards from outside to inside in a penetrating manner, and the steel strand penetrating pipe is distributed for 5 times in the circumferential direction and is uniformly distributed for 5 times.

Further, the method comprises the following steps of; the height difference of the inclined planes of the connecting surfaces of the lower cavity and the upper cavity is 10 cm.

This infrastructure's positive beneficial technological effect lies in: 1. the wind turbine foundation is connected by the prestressed anchor bolts, aiming at the problems of rigidity, strength mutation and durability of the foundation ring foundation, the tower cylinder and the wind turbine foundation are connected by the prestressed anchor bolts, the stress mode of the prestressed anchor bolts is completely different from that of the foundation ring connection, and the possible adverse condition of the wind turbine foundation in the operation of the wind turbine foundation connected by the foundation ring is avoided; 2. compared with the traditional solid foundation, the hollow foundation with the cup opening is arranged inside the foundation, so that the consumption of concrete is reduced, the cost is directly saved, the internal space is large, the cable penetrating and releasing construction and wiring work are facilitated, and the anchor cable penetrating and releasing and pre-tightening work are also facilitated; 3. the inner hollow part is of an inverted step type (the height difference of the inclined surface is 10 cm), the design is specially designed for installation of the pre-stressed anchor base plate and the anchor cable sleeve and pre-tightening of the anchor cable, and follow-up anchor cable overhauling and replacement are facilitated.

Drawings

Figure 1 is a schematic cross-sectional view of the present infrastructure.

Fig. 2 is a portion of a top view of the present infrastructure taken.

Fig. 3 is an enlarged view of a portion where the bellows is pierced.

Fig. 4 is a schematic view of the steel strand threading tube.

FIG. 5 is a schematic view of the bellows and anchor pad connection.

Detailed Description

In order to explain the utility model more fully, the utility model provides an implementation example. These examples are merely illustrative of the present invention and do not limit the scope of the present invention.

The invention is explained in further detail with reference to the drawings, in which the reference symbols are: 1: CFG piles; 2: a mattress layer; 3: a cushion layer; 4: a base plate; 5: a middle pier; 6: the connecting surface between the bottom plate and the middle pier; 7: a lower cavity; 8: an upper cavity; 9: the connecting surface of the lower cavity and the upper cavity; 10: a bellows; 11: an anchor backing plate; 12: a cable tube; 13: mounting a ground plane; 14: a tower drum; 15: grouting grooves; 16: steel strand wires; 17: the steel strand penetrates through the pipe; 18: and (4) grouting a channel.

As shown in the attached drawings, the foundation structure of the low-wind-speed high-mixing tower fan in the plain is described by taking the diameter of a bottom plate of 20m as an example, and comprises a CFG pile (cement fly ash gravel pile) composite foundation, wherein the diameter of the CFG pile is 400mm, the pile spacing is 1.5-2.0m, annular arrangement is adopted, a mattress layer with the thickness of 230-300mm is laid on the CFG pile composite foundation, the mattress layer is made of stones with the granularity of 100-200mm, the virtual laying thickness of the mattress layer is not less than 230mm, and static compaction is adopted after the virtual laying is finished; c20 plain concrete cushion layer 3 with the thickness of 150mm is poured on the mattress layer 2, a fan installation foundation integrated with the cushion layer is poured on the cushion layer, the fan installation foundation comprises a bottom plate 4 and a middle pier 5 which are positioned at the bottommost part, the bottom plate and the middle pier are of an integrated reinforced concrete pouring structure, the diameter of the middle pier is smaller than that of the bottom plate, and in the embodiment, the outer diameter of the middle pier is 10.8 m; the connecting surface between the bottom plate and the middle pier is an inclined surface which is upward from outside to inside, as shown in 6, the bottom plate and the middle pier are both of a hollow structure, the diameter of a lower cavity of the hollow structure is large, the diameter of an upper cavity of the hollow structure is small, in the embodiment, the radius of the lower cavity is 3.06m, the radius of the upper cavity is 715mm smaller than that of the lower cavity, the connecting surface between the lower cavity and the upper cavity is an inclined surface which is downward from inside to outside, as shown in 9, the height difference of the inclined surface of the connecting surface between the lower cavity and the upper cavity is 10cm, the inclined surface forms a ring beam stressed at an anchoring end, ten groups of anchor backing plates which are evenly distributed are fixedly arranged on the inclined surface, 11 is an anchor backing plate which can be fixed on a steel plate which is fixedly connected on steel bars in a foundation, each group of the anchor backing plates is four, the radian occupied by each group of the anchor backing plates, 18, a grouting channel is shown, the corrugated pipe 10 penetrates through the anchor backing plate, the corrugated pipe and the anchor backing plate are sealed, the lower end of the corrugated pipe is positioned above the grouting channel, the corrugated pipe penetrates through the reinforcing steel bars, the upper end of the corrugated pipe is positioned on a grouting groove 15 on the middle pier surface, the grouting groove (the groove width is 500mm, the groove height is 50 mm), the corrugated pipe and the anchor backing plate form an anchor cable sleeve, when the foundation is poured, the port of the anchor backing plate and the grouting channel need to be plugged firstly, the corrugated pipe and the grouting channel are opened after pouring is finished, and a cable pipe penetrates through the fan installation foundation; the steel strand penetrating pipe 17 which slants downwards from outside to inside penetrates through the bottom plate is arranged on the bottom plate, the steel strand penetrating pipe is arranged on the circumference direction for 5 ways, the 5 ways are uniformly distributed, and the steel strand penetrating pipe is used for conveying steel strands into a wind power installation foundation. In the figure, the steel strand and the tower drum are installed and are not part of the foundation.

After the foundation is finished, the ring beam is an anchoring end at the lower part of a prestressed steel strand (anchor cable), 10 groups of anchor cable sleeves (4 in each group) and 5 steel strands (PE phi 150) are reserved in the foundation to penetrate through the pipe, and the strength grade of the foundation concrete is C40P 6. The wind turbine adopts a concrete tower barrel, is fastened by a post-tensioned prestressing anchor cable, adopts a foundation design and applies a foundation ring-free and anchor bolt-free hollow wind turbine foundation technology, and the wind turbine foundation is a hollow disc-shaped bearing platform. During installation, the anchor cable penetrates through the steel strand penetrating pipe to enter the hollow structure, then penetrates through the tower barrel from the anchor cable sleeve, and after adjustment is finished, grouting solidification is carried out through the grouting channel of the anchor backing plate.

After the embodiments of the present invention have been described in detail, those skilled in the art can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above claims, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention all fall within the scope of the technical solution of the present invention, and the present invention is not limited to the embodiments of the examples given in the specification.

Claims (3)

1. Plain low wind speed high tower fan foundation structure that mixes includes CFG stake composite foundation, its characterized in that: the CFG pile is 400mm in diameter, the pile spacing is 1.5-2.0m, annular arrangement is adopted, a mattress layer with the thickness of 230-300mm is laid on a CFG pile composite foundation, a C20 concrete cushion layer with the thickness of 150mm is poured on the mattress layer, a fan installation foundation integrated with the concrete cushion layer is poured on the concrete cushion layer, the fan installation foundation comprises a bottom plate and a middle pier which are positioned at the bottommost part, the bottom plate and the middle pier are of an integrated reinforced concrete pouring structure, the diameter of the middle pier is smaller than that of the bottom plate, the connecting surface between the bottom plate and the middle pier is an inclined surface which is upward from outside to inside, the bottom plate and the middle pier are both hollow structures, the diameter of a lower cavity of the hollow structure is large, the diameter of an upper cavity is small, the connecting surface between the lower cavity and the upper cavity is an inclined surface which is downward from inside to outside, ten groups of anchor backing plates which are evenly distributed are fixedly arranged on the, the radian occupied by each group of anchor backing plates is within 15 degrees, each anchor backing plate is tubular, a grouting channel is arranged on the side surface of a pipe port, the corrugated pipe penetrates through each anchor backing plate, the corrugated pipe and the anchor backing plates are sealed, the lower end of the corrugated pipe is positioned on the grouting channel, the corrugated pipe penetrates through the reinforcing steel bars, the upper end of the corrugated pipe is positioned on a grouting groove on the middle pier surface, the corrugated pipe and the anchor backing plates form an anchor cable sleeve, and a cable pipe penetrates through the fan installation foundation.

2. The plain low-wind-speed high-mixing tower fan foundation structure of claim 1, characterized in that: the bottom plate is provided with a steel strand penetrating pipe which slants downwards from outside to inside in a penetrating manner, and the steel strand penetrating pipe is distributed for 5 times in the circumferential direction and is uniformly distributed for 5 times.

3. The plain low-wind-speed high-mixing tower fan foundation structure of claim 1, characterized in that: the height difference of the inclined planes of the connecting surfaces of the lower cavity and the upper cavity is 10 cm.

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