CN204456167U - Prestress anchoraging blower foundation - Google Patents

Abstract

The utility model relates to a prestressed anchor fan foundation, which belongs to the building structure of a wind power generating set. The purpose is to effectively prevent the inclination of the fan tower and correct the inclination of the fan tower to a certain extent. Including the reinforced concrete foundation and the tower installation device, the reinforced concrete foundation includes the underground part and the surface part, the underground part includes the upper surface and the lower surface; the tower installation device is fixed on the reinforced concrete foundation along the vertical direction, and its center line The center line of the foundation coincides; several steel casings are pre-embedded in the underground part; it also includes prestressed anchor rods or prestressed anchor cables and anchor piers. Connected, the other end passes through the lower surface, and the number of prestressed anchor rods or prestressed anchor cables, steel casings and anchor piers is equal. The utility model makes the rock foundation and the reinforced concrete foundation tightly bonded together, effectively controls the void area between the rock foundation and the reinforced concrete foundation, and effectively prevents the fan tower from tilting.

Description

Prestressed anchor fan foundation

technical field

The utility model relates to a building structure of a wind power generating set, in particular to a prestressed anchoring fan foundation for installing a fan on a rock foundation.

Background technique

For wind farms located in mountainous or hilly areas, most of the wind turbines are installed on rocky foundations. At present, the fan foundations used on rock foundations mainly include ordinary reinforced concrete expansion foundations and rock anchor foundations.

(1) Ordinary reinforced concrete expansion foundation. During construction, first excavate a foundation pit with a large chassis size on the rock foundation, and then pour concrete into the foundation pit to form an extended foundation. The diameter of the extended foundation can reach 15-30 meters, and the height can reach 3-5 meters. It takes about 300 -500 cubic meters of massive reinforced concrete poured. The extended foundation can only resist the overturning moment by the self-weight and backfill soil pressure brought by the volume of the foundation and the buried depth. Although this type of foundation design experience is mature and construction is convenient, the amount of excavation is large and the backfilling soil is large. When this kind of foundation is used for broken rock foundations, it still has great advantages. However, if the engineering rock mass is classified as relatively hard and above, complete and above rock foundation, not only the engineering volume is large, but also the construction period and equipment wear problems will be caused by the large excavation volume and immobile excavation. In addition, the ordinary foundation has a large volume, and the construction time for one-time continuous pouring is too long. However, the weather in the mountainous area changes rapidly and the temperature difference between day and night is large, and the road conditions of the wind farm are poor and easy to freeze, which leads to concrete in the process of mixing, conveying, and pouring. Prone to problems. The construction cost, construction quality, construction period, environmental protection and other disadvantages of ordinary reinforced concrete extended foundation are prominent.

(2) Rock bolt foundation. The rock bolt foundation bears the tensile stress between the foundation and the rock foundation through the bolt, which effectively reduces the size and depth of the foundation, and greatly reduces the amount of engineering. For example, the Chinese patent application with the publication number CN201220118796 discloses a basic structure of anchor fan, including a foundation ring and a reinforced concrete bearing platform, and tensile anchors fixedly connected to it are uniformly arranged on the outer periphery of the bottom of the reinforced concrete bearing platform. One end of the anchor rod of this kind of anchor fan foundation structure is located in the rock foundation, and the other end is located in the reinforced concrete bearing platform. The rock foundation and the reinforced concrete bearing platform are pulled by the anchor rod, which solves a series of problems of ordinary reinforced concrete expansion foundation. However, since the anchor is directly buried in the foundation concrete and rock foundation, only after the anchor and the foundation start to be disengaged and the bedrock and the anchor are tightly clamped can the anchor begin to be stretched and gradually develop. Strength creates tension. The length of this section is difficult to determine and control. Coupled with the fatigue load, the tower tilt problem may occur in actual operation.

Utility model content

The purpose of the utility model is to provide a prestressed anchored fan foundation with higher safety performance, which can effectively prevent the inclination of the fan tower, and has the ability to correct the inclination of the fan tower.

The technical scheme adopted by the utility model is: the prestressed anchor fan foundation includes a reinforced concrete foundation and a tower installation device, the reinforced concrete foundation includes an underground part and a surface part, and the underground part includes an upper surface, a lower surface and a side surface; The tower installation device is fixed on the reinforced concrete foundation along the vertical direction, one end of the tower installation device is exposed to the surface, and the center line of the tower installation device coincides with the center line of the reinforced concrete foundation; the underground of the reinforced concrete foundation Partially embed several steel casings vertically penetrating the upper surface from the lower surface;

It also includes prestressed anchor rods or prestressed anchor cables and anchor piers. The prestressed anchor rods or prestressed anchor cables pass through steel sleeves, one end passes through the upper surface and connects with the anchor pier, and the other end passes through the lower surface. The number of prestressed anchor rods or prestressed anchor cables, steel casings and anchor piers is equal.

Further, the several steel sleeves are evenly distributed along at least one circumference, and the center of the circumference coincides with the centerline of the reinforced concrete foundation.

Further, it also includes a concrete ring wall, the concrete ring wall is fixedly arranged on the upper surface of the reinforced concrete foundation, the steel casing vertically penetrates the concrete ring wall, and the anchor pier is fixed on the concrete ring wall.

Further, the cross-sectional shape of the reinforced concrete foundation along the horizontal direction is a circle or a regular polygon.

The beneficial effects of the utility model are:

Prestressed anchoring fan foundation, one end of the prestressed anchor rod or prestressed anchor cable is buried in the rock foundation, and the other end pulls the reinforced concrete foundation, and the rock foundation and the reinforced concrete foundation are closely connected by prestressing, effectively controlling the rock foundation. The void area from the reinforced concrete foundation fully exerts the bearing capacity of the rock foundation, improves the strength utilization rate of steel bars and concrete, and effectively prevents the tilting of the wind turbine tower; it can reduce the size of the foundation, thereby reducing the amount of work and reducing the The construction cost is reduced, the construction period is shortened, and it has certain economic benefits. In addition, several steel casings are pre-embedded in the underground part of the reinforced concrete foundation, and the prestressed anchor rod or prestressed anchor cable passes through the steel casing to connect with the anchor pier, that is, there is a section of prestressed anchor rod or prestressed anchor cable in the steel casing. The free section is convenient for tensioning the prestressed anchor rod or prestressed anchor cable. For example, when the reinforced concrete foundation after construction reaches the strength requirement, the prestressed anchor rod or prestressed anchor cable is stretched to ensure that the rock foundation and the prestressed anchor cable Close fit of reinforced concrete foundation; when the stress is uneven and the fan tower tilts, the prestressed anchor rod or prestressed anchor cable can be repeatedly stretched to compensate for the stress loss, so as to achieve the purpose of correcting the tilt of the fan tower. There is a certain free section in the prestressed anchor rod or prestressed anchor cable in the steel casing, and the vibration excitation method can be used to conveniently detect the size of the prestressed force non-destructively, which is beneficial to the long-term operation and maintenance of the wind farm.

The prestressed anchor fan foundation adopts the design of the concrete ring wall, so that the prestressed anchor rod or prestressed anchor cable can directly transmit force through the anchor pier, and become a prestressed anchor rod or prestressed anchor cable that can transmit force to the concrete ring through the anchor pier. The wall, and then transmit the force to the reinforced concrete foundation through the concrete ring wall, forming a pre-stress on the reinforced concrete foundation. The concrete ring wall disperses the point stress from the anchor pier, so that the pressure on the reinforced concrete foundation is evenly distributed, and the stress concentration is avoided. Moreover, once a certain prestressed anchor rod or prestressed anchor cable fails and the anchor needs to be repaired, it is necessary to find the failed prestressed anchor rod or prestressed anchor cable, and then replace the failed prestressed anchor rod or prestressed anchor cable with the corresponding A prestressed anchor rod or prestressed anchor cable is added between adjacent prestressed anchor rods or prestressed anchor cables, and the design of the ring wall is convenient to find the failed prestressed anchor rod or prestressed anchor cable, and at the same time it is convenient to repair anchor.

Description of drawings

Fig. 1 is the top view of the utility model in which the foundation of the blower fan is the foundation ring type.

Fig. 2 is A-A sectional view.

Fig. 3 is a top view of the utility model in which the foundation of the fan is an anchor bolt type.

In the figure, a reinforced concrete foundation 1, an underground part 11, a surface part 12, an upper surface 111, a lower surface 112, a side surface 113, a steel casing 2, a prestressed anchor rod or a prestressed anchor cable 3, an anchor pier 4, and a concrete ring wall 5. Foundation ring 6, foundation ring bracket 7, bracket embedded parts 8, plain concrete cushion 9, rock foundation 10, anchor bolt 61, lower anchor plate 62, upper anchor plate 63, and installation nut 64.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further as follows:

As shown in Figure 1 or Figure 2, the prestressed anchor wind turbine foundation includes a reinforced concrete foundation 1 and a tower installation device, the reinforced concrete foundation 1 includes an underground part 11 and a surface part 12, and the underground part 11 includes an upper surface 111 , the lower surface 112 and the side surface 113; the tower installation device is fixed on the reinforced concrete foundation 1 along the vertical direction, one end of the tower installation device 6 is exposed to the surface part 12, and the center line of the tower installation device is in line with the reinforced concrete foundation 1 coincide with the center lines; the underground part 11 of the reinforced concrete foundation 1 pre-embeds several steel sleeves 2 vertically penetrating the upper surface 111 from the lower surface 112;

It also includes a prestressed anchor rod or a prestressed anchor cable 3 and an anchor pier 4. The prestressed anchor rod or prestressed anchor cable 3 passes through the steel sleeve 2, and one end passes through the upper surface 111 to connect with the anchor pier 4, and the other end passes through the Through the lower surface 112, the number of prestressed anchor rods or prestressed anchor cables 3, steel sleeves 2 and anchor piers 4 is equal.

The part of the reinforced concrete foundation 1 located under the backfill is the underground part 11 , and the part above the backfill is the surface part 12 . The tower installation device is used to install and fix the wind turbine tower. For the base ring fan foundation, as shown in Figure 1 or Figure 2, the tower installation device is the fan base ring 6, one end of the fan base ring 6 is buried in the reinforced concrete foundation 1 along the vertical direction, and the other end is exposed to the surface 12. The fan base ring 6 can be supported by the base ring bracket 7 and the bracket embedded parts 8, that is, a layer of plain concrete cushion 9 is poured between the rock foundation 10 and the reinforced concrete foundation 1, and the bracket embedded parts 8 are embedded in the The plain concrete cushion 9, the base ring bracket 7 are bound on the bracket embedded part 8, and the fan base ring 6 is bound on the base ring bracket 7. For the anchor-bolt fan foundation, as shown in Figure 3, the installation device for the tower is an anchor bolt 61, and the lower anchor plate 62 is set on the lower surface 112 of the underground part 11 of the reinforced concrete foundation 1, and the lower anchor plate 62 is pre-embedded in the plain concrete. The soil cushion 9 is provided with an upper anchor plate 63 corresponding to the lower anchor plate 62 at a position where the surface part 12 of the reinforced concrete foundation 1 is opposite to the lower surface 112, and the anchor bolt 61 vertically penetrates the lower anchor plate 62 and the upper anchor plate 63 One end of the anchor bolt 61 passing through the upper anchor plate 63 passes through the installation hole of the fan tower, and then the installation nut 64 is tightened to fix the fan tower on the reinforced concrete foundation 1 . One end of the prestressed anchor rod or prestressed anchor cable 3 is pre-embedded in the rock foundation 10 through the lower surface 112, and the other end is connected to the anchor pier 4 through the upper surface 111. Under the action of prestress, the anchor pier 4 transmits force downward , the reinforced concrete foundation 1 is closely attached to the rock foundation 10 after receiving the pressure from the anchor pier 4, effectively controlling the void area between the rock foundation 10 and the reinforced concrete foundation 1, ensuring the anti-overturning performance of the reinforced concrete foundation 1, and improving the The anti-sliding performance of reinforced concrete foundation 1, the anti-sliding safety factor of reinforced concrete foundation 1 is 0.9-1.6 points higher than that of ordinary extended foundation, and the anti-overturning coefficient is equal to that of ordinary extended foundation, which fully exerts the bearing capacity of rock foundation 10 and improves The strength utilization rate of steel bars and concrete is improved, and the fan tower supported on the reinforced concrete foundation 1 is effectively prevented from tilting; and the size of the foundation can be reduced, thereby reducing the amount of work, reducing the construction cost, shortening the construction period, and has certain economic benefits. benefit. The steel casing 2 is to allow the prestressed anchor rod or prestressed anchor cable 3 to pass through, to reserve a free section for the prestressed anchor rod or prestressed anchor cable 3, and to meet the requirements of tensioning the prestressed anchor rod or prestressed anchor cable 3 It also facilitates non-destructive testing of the size of the prestress using the excitation method, which facilitates the long-term operation and maintenance of the wind farm. When the reinforced concrete foundation 1 is maintained to reach the design strength after construction, the prestressed anchor rod or prestressed anchor cable 3 is stretched to make it reach the design pretension, and then the prestressed anchor rod or prestressed anchor rod or prestressed anchor is pulled through the anchor pier 4 and the rock foundation 10. The stress anchor cable 3, because the prestress anchor rod or the prestress anchor cable 3 has the force to return to the state before tensioning, under the action of this force, the tight fit between the reinforced concrete foundation 1 and the rock foundation 10 is ensured. Since the steel casing 2 leaves a free section for the prestressed anchor rod or prestressed anchor cable 3, when the wind tower is tilted due to uneven stress or other reasons, the prestressed anchor rod or prestressed anchor cable 3 can be repeated. Stretching to compensate for stress loss can also properly release prestress, so as to achieve the purpose of correcting the inclination of the wind turbine tower.

Further, the several steel sleeves 2 are evenly distributed along at least one circumference, and the center of the circumference coincides with the centerline of the reinforced concrete foundation 1 .

In order to make the reinforced concrete foundation 1 receive uniform prestress in the corresponding orientation and avoid uneven settlement due to uneven prestress, the several steel sleeves 2 are uniformly distributed along at least one circumference, and The center of the circle coincides with the centerline of the reinforced concrete foundation 1. As a preferred embodiment, the prestressed anchor rods or prestressed anchor cables 3 should be evenly arranged on the circle where the underground part 11 of the reinforced concrete foundation 1 retracts 1 meter inward along the side surface 113 . The layout spacing of prestressed anchor rods or prestressed anchor cables 3 should be 1.5m, preferably in the range of 1.0-2.0m. In Fig. 1 and Fig. 2, the reinforced concrete foundation 1 is provided with only one ring of steel sleeves 2, of course, as required, one or more rings of steel sleeves 2 can be added inside the ring of steel sleeves 2.

Further, as shown in Fig. 1 or Fig. 2, it also includes a concrete ring wall 5, the concrete ring wall 5 is fixedly arranged on the upper surface 111 of the reinforced concrete foundation 1, and the steel casing 2 runs through the concrete ring in the vertical direction. Wall 5, the anchor pier 4 is fixed on the concrete ring wall 5.

The concrete ring wall 5 may not be provided, so that the anchor pier 4 slightly exposes the upper surface 111 of the underground part 11 of the reinforced concrete foundation 1, and it is covered with backfill. However, if no concrete ring wall 5 is provided, the prestressed anchor rod or prestressed anchor cable 3 directly transmits force through the anchor pier 4 , and the reinforced concrete foundation 1 is under the pressure of the anchor pier 4 . And the concrete ring wall 5 is set, as shown in Figure 2, the prestressed anchor rod or prestressed anchor cable 3 transmits force to the concrete ring wall 5 through the anchor pier 4, and then passes the force to the reinforced concrete foundation 1 through the concrete ring wall 5. The reinforced concrete foundation 1 forms a preload. The concrete ring wall 5 disperses the point stress transmitted from the anchor pier 4, avoiding stress concentration. Moreover, once a certain prestressed anchor rod or prestressed anchor cable 3 fails, and the anchor needs to be repaired, it is necessary to find the failed prestressed anchor rod or prestressed anchor cable 3, and then replace the failed prestressed anchor rod or prestressed anchor cable 3 and the adjacent prestressed anchor rod or prestressed anchor cable 3, add a prestressed anchor rod or prestressed anchor cable 3, and the design of the concrete ring wall 5 facilitates the finding of failed prestressed anchor rods or prestressed anchor cables Anchor cable 3. Since the concrete ring wall 5 is fixedly arranged on the upper surface 111 of the reinforced concrete foundation 1, and the anchor pier 4 is fixed on the concrete ring wall 5, when repairing the anchor, the tree root prestressed anchor rod or prestressed anchor can be accurately found without measurement. The circumference where cable 3 is located can be repaired by conventional anchor repair methods, which is convenient for anchor repair operations. Therefore, preferably, a concrete ring wall 5 is included, the concrete ring wall 5 is fixedly arranged on the upper surface 111 of the reinforced concrete foundation 1 , and the anchor pier 4 is fixed on the concrete ring wall 5 .

Further, the cross-sectional shape of the reinforced concrete foundation 1 along the horizontal direction is a circle or a regular polygon.

The reinforced concrete foundation 1 can be any achievable shape, but, in order to make the reinforced concrete foundation 1 be stressed in all directions as uniform as possible, preferably, the cross-sectional shape of the reinforced concrete foundation 1 along the horizontal direction is a circle or a regular polygon.

The construction process of the prestressed anchor fan foundation of the utility model is as follows:

1. Excavate the foundation pit, clear the bottom manually after the excavation is completed, pre-embed the embedded parts 8 of the bracket, and pour the plain concrete cushion 9.

2. To conduct positioning drilling for the position where the prestressed anchor rod or prestressed anchor cable 3 needs to be buried in the rock foundation 10, the hole should be formed by dry drilling. After the drilling is completed, the hole should be cleaned, and the hole should be cleaned by compressed air, and water flushing is not allowed.

3. Put the prestressed anchor rod or prestressed anchor cable 3 into the borehole, and pressure grout.

4. Bind the base ring bracket 7, hoist the base ring 6 and level it.

5. After the parts of the prestressed anchor rod or prestressed anchor cable 3 exposed outside the rock foundation 10 are passed through the steel casing 2 one by one, the foundation steel bars and the steel casing 2 are bound.

6. Pour reinforced concrete foundation 1 and reinforced concrete ring wall 5.

7. After the grouting material and foundation concrete have reached the design strength, pull the prestressed anchor rod or prestressed anchor cable 3 pieces to the design pretension. When applying prestress, it should be applied in stages symmetrically according to the center of the circle, so as to avoid the initial uneven settlement of the foundation.

The prestressed anchor rod or prestressed anchor cable 3, the anchor pier 4 and the reinforced concrete foundation 1 must be inspected and monitored during the construction and operation phases. After completion, the tension, deformation and corrosion conditions of the prestressed anchor rod or prestressed anchor cable 3 shall be continuously monitored, inspected and protected in strict accordance with the requirements. Regularly carry out deformation observations on the settlement of reinforced concrete foundation 1 and the inclination of the tower. When the fan is in shutdown state, when the prestress value of the prestressed anchor rod or prestressed anchor cable 3 is lower than the design prestress to a certain extent, repeated tensioning measures should be taken. In the event of accidents such as earthquakes, strong winds that greatly exceed local meteorological statistics, etc., post-disaster prestressed anchor rods or prestressed anchor cables 3 inspections should be added.

Claims (4)

1. prestress anchoraging blower foundation, comprise reinforced concrete foundation (1) and tower cylinder erecting device (6), described reinforced concrete foundation (1) comprises under ground portion (11) and ground matrix section (12), and described under ground portion (11) comprises upper surface (111), soffit (112) and side (113); Described tower cylinder erecting device (6) is fixed on reinforced concrete foundation (1) along vertical direction, ground matrix section (12) is exposed in tower cylinder erecting device (6) one end, and the center line of tower cylinder erecting device (6) overlaps with the center line of reinforced concrete foundation (1); It is characterized in that: the pre-buried several steel sleeve (2) vertically being run through upper surface (111) by soffit (112) of under ground portion (11) of described reinforced concrete foundation (1);

Also comprise prestressed anchor or prestress anchorage cable (3) and anchor pier (4), described prestressed anchor or prestress anchorage cable (3) are by steel sleeve (2), one end is connected with anchor pier (4) through upper surface (111), the other end is through soffit (112), and described prestressed anchor or prestress anchorage cable (3), steel sleeve (2) are equal with anchor pier (4) quantity.

2. prestress anchoraging blower foundation as claimed in claim 1, is characterized in that: described several steel sleeve (2) distributes along at least one even circumferential, and the center of circle of circumference overlaps with the center line of reinforced concrete foundation (1).

3. prestress anchoraging blower foundation as claimed in claim 1 or 2, it is characterized in that: also comprise concrete ring wall (5), described concrete ring wall (5) is fixedly installed on the upper surface (111) of reinforced concrete foundation (1), described steel sleeve (2) is through concrete ring wall (5) vertically, and described anchor pier (4) is fixed on concrete ring wall (5).

4. prestress anchoraging blower foundation as claimed in claim 1 or 2, is characterized in that: described reinforced concrete foundation (1) cross sectional shape is in the horizontal direction circular or regular polygon.