CN205205849U - Removable formula prestressed anchorage ties wind turbine foundation - Google Patents

Abstract

The utility model discloses a removable formula prestressed anchorage ties wind turbine foundation, it includes that concrete foundation, a fan tower section of thick bamboo and prestressed anchorage tie, its characterized in that still includes: the operation well that constitutes with the post and lintel system in the middle of concrete foundation and prestressed anchorage tie, tie top and bottom fixed connection's upper and lower ring flange, the higher authority and fan tower section of thick bamboo fixed connection of going up the ring flange respectively with prestressed anchorage, operate set operating space that trades that the lower flange coiled the below constitution that extends to of well. The problem of the crab -bolt not removable is solved, make the crab -bolt accessible time more renew the crab -bolt because of a variety of causes after the fracture appearing, guarantee that the fan is normal, safety, steady operation, can further promote the application of crab -bolt formula wind turbine foundation in china and even world's wind -powered electricity generation trade.

Description

Replaceable prestressed anchor bolt fan foundation

technical field

The utility model relates to a building foundation, in particular to a wind power generator foundation.

Background technique

At present, the foundation of wind turbines in my country mainly adopts extended concrete foundation, and the steel structure foundation ring is embedded in the foundation and then connected to the wind turbine tower. After the wind turbine has been running for a period of time, the foundation ring is prone to loosening, which affects the safety of the wind turbine. Stable operation. In order to avoid the defect of foundation ring fan foundation, in recent years, a foundation form that uses prestressed anchor bolts to connect the fan tower has emerged. The connection between the foundation and the fan tower has the advantages of reliable anchorage and fast construction speed. The disadvantage is that if the anchor bolt breaks, it cannot be replaced or the cost of replacement is relatively high. This disadvantage restricts the use and promotion of this basic form in the wind power industry in my country.

Utility model content

The purpose of the utility model is to provide a replaceable prestressed anchor fan foundation with reliable anchorage, fast construction speed, replaceability and low replacement cost.

For reaching above-mentioned purpose, the technical scheme of the utility model is:

A replaceable prestressed anchor bolt fan foundation, which includes a concrete foundation and a prestressed anchor bolt, is characterized in that it also includes:

The operation well is located in the central area of the concrete foundation and the prestressed anchor bolt;

The upper and lower flanges are respectively fixedly connected with the upper and lower sides of the prestressed anchor bolts, and the top of the upper flange is fixedly connected with the fan tower;

The operation well extends to the anchor replacement operation space formed under the lower flange.

Between the operation well, the bottom surface of the concrete foundation and the concrete foundation cushion, there is a waterproof sheet for waterproofing.

A cross-shaped concrete beam column connected to the concrete foundation is arranged in the middle of the operation well.

An access channel is provided in the operation well.

The steps for replacing the broken anchor bolts of the replaceable prestressed anchor bolt fan foundation with the above structure are as follows:

1. The part above the breaking point can be pulled out directly from the anchor bolt sleeve on the top surface of the foundation;

2. For the part below the breaking point, the anchor bolt will fall to the operating space under the lower flange in theory. If it does not fall by itself, the anchor bolt of this section will be dropped from the top with the help of a jack;

3. Since the operating space under the lower flange is relatively short, it may be much shorter than the length of the lower section of the broken anchor bolt, so the exposed anchor bolt can be cut off with a gas flame torch;

4. Repeat steps 2 and 3 until all the anchor bolts below the breaking point are taken out;

5. On the top surface of the foundation, extend the new anchor bolt from the original casing to the bottom surface of the foundation, and install the new anchor bolt on the bottom and the fastening nut of the lower flange;

6. Apply prestress to the new anchor bolts from the top of the foundation. After reaching the design value, install the new anchor bolts on the top of the foundation and the fastening nuts of the upper flange;

7. Restore the relevant protective facilities on the top surface of the foundation.

The advantages of the replaceable prestressed anchor fan foundation of the utility model are:

1. The replacement of broken anchor bolts has little disturbance and influence on the original fan foundation, and does not damage the anchor bolts and other structures of the fan foundation;

2. The operation of replacing broken anchor bolts is simple and easy, the construction time is short, and the normal operation of the wind turbine is not even delayed, ensuring the running time of the wind farm;

3. The replacement cost is low, reducing the operation and maintenance cost of the fan foundation;

4. To promote the application of anchor-bolted fan foundations in the wind power industry in my country and the world.

Description of drawings

Fig. 1 is the front view structural representation of the utility model;

Fig. 2 is a schematic structural view of Fig. 1 taken along line A-A;

In the figure, concrete foundation 1, concrete beam column 2, access channel 3, fan tower 4, upper flange 5, water stop 6, anchor replacement operation space 7, lower flange 8, concrete foundation pad Layer 9, prestressed anchor bolt 10.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Fig. 1, it is a schematic diagram of the main structure of the utility model, which includes a circular concrete foundation 1, a cross-shaped concrete beam column 2, an entrance channel 3, a fan tower 4 and an upper flange 5; wherein, the entrance The channel 3 is set on the operation shaft formed by the concrete beam column 2, and the cross-shaped concrete beam column connected to the concrete foundation 1 is arranged in the middle of the operation shaft; Fig. 2 is a schematic structural view of Fig. 1 taken along line A-A. In conjunction with Fig. 2, the prestressed anchor bolt 10 is pre-embedded in the concrete foundation 1; The anchor bolt 10 is movable in the casing. The upper and lower sides of the prestressed anchor bolt 10 are fixedly connected with the upper flange 5 and the lower flange 8 respectively. Below the lower flange 8, there is an operation shaft extending to the anchor changing operation space 7 below the lower flange, for when the anchor breaks, people enter into the changing operation space 7 through the access channel 3. For the lower section of the broken prestressed anchor bolt, cut it off with a gas flame torch and take it out section by section until the lower section of the prestressed anchor bolt is completely taken out. The new prestressed anchor bolt is inserted from the casing, the bottom nut is installed first, and the top nut is installed after the prestress is applied on the top surface of the foundation to complete the replacement of the prestressed anchor bolt.

Since the concrete foundation 1, the beam-column system 2 and the prestressed anchor bolt 10 are all buried below the ground, water seepage is likely to occur at the bottom of the operation well, which affects the anti-corrosion and replacement of the prestress anchor bolt. A layer of anti-seepage performance is installed at the bottom of the operation well concrete foundation cushion 9, and a water-stop sheet 6 is set between the concrete foundation 1 and the concrete cushion 9 at the bottom thereof. Described water-stop sheet 6 can adopt rubber, copper sheet or galvanized iron sheet according to the situation of site groundwater.

In order to improve the stress around the flange of the prestressed anchor bolt on the bottom of the foundation, a beam-column system is set in the middle of the operation shaft to improve the stress on the bottom of the foundation without affecting the operating space for replacing the prestressed anchor bolt. Due to the arrangement of the operation well and the operation space 7, the stress-bearing area of the foundation is reduced, so that the compressive stress of the foundation and cushion concrete around the operation space 7 is relatively large. If the load transmitted by the superstructure is large, and the local compressive stress exceeds the compressive bearing capacity of the concrete, the concrete will be damaged under compression, which will affect the safety of the foundation structure. After the beam-column system is added, a part of the superstructure load can be transferred from the concrete foundation to the beam. The column system is then transmitted to the foundation, which can improve the local stress concentration of the operation space 7 and the stress of the entire foundation. If the load transmitted from the superstructure is small, and the compressive stress of the foundation and cushion concrete around the operating space 7 is within the range of concrete compressive bearing capacity, the beam-column system can be canceled, which can reduce the amount of concrete work and investment. It can also speed up the construction progress of the project, and at the same time leave a larger operating space for the replacement of anchor bolts in the later stage.

Claims (4)

1. A replaceable prestressed anchor bolt fan foundation, which includes a concrete foundation, a fan tower and a prestressed anchor bolt, is characterized in that it also includes: The operation well is located in the central area of the concrete foundation and the prestressed anchor bolt; The upper and lower flanges are respectively fixedly connected with the upper and lower sides of the prestressed anchor bolts, and the top of the upper flange is fixedly connected with the fan tower; The operation well extends to the anchor replacement operation space formed under the lower flange. 2. The fan foundation according to claim 1, characterized in that: Between the operation well, the bottom surface of the concrete foundation and the concrete foundation cushion, there is a waterproof sheet for waterproofing. 3. The fan foundation according to claim 1, characterized in that: A cross-shaped concrete beam column connected to the concrete foundation is arranged in the middle of the operation well. 4. The fan foundation according to claim 1, characterized in that: An access channel is provided in the operation well.