CN205046574U - Enlarged footing prestressed anchorage pole wind turbine foundation device - Google Patents

Abstract

The utility model discloses a foundation device for an enlarged head prestressed bolt fan, and relates to the technical field of fixing large-scale wind power generators in construction projects. The device is: a drilling hole and an expansion chamber are uniformly arranged in the circumference of the foundation cap, and a steel casing is arranged in each drilling hole; an anchor rod is arranged in the steel casing, and the bottom end of the anchor rod is passed through a sliding pin, The driven pin and the fixed pin are sequentially connected with a metal connecting rod, an upper rotating rod and a lower rotating rod to form an enlarged head; high-strength concrete is cast in the drilling hole and the enlarged chamber of the foundation cap; a metal foundation ring is set on the top of the steel casing and high-strength nuts. The utility model has a firm foundation, saves engineering investment, and has fast construction progress. In particular, the expanding head has greater vertical pull-out resistance and can resist the huge bending moment from the upper tower of the fan.

Description

An expansion head prestressed bolt fan foundation device

technical field

The utility model relates to the technical field of fixing large-scale wind power generators in construction engineering, in particular to a base device for wind turbines with prestressed bolts with enlarged heads.

Background technique

At present, the installed capacity of onshore wind farms built in my country is about 80 million kW, and the exploitable capacity of my country's onshore wind energy resources is about 2.38 billion kW. For each wind farm with an installed capacity of 50,000 kW, the amount of foundation concrete with C35~C40 strength is about 13750m ³ . Under the premise of satisfying the safety and stability of the foundation, the optimized foundation shape can save a lot of foundation concrete engineering. In addition, for large-scale wind turbines, concrete gravity support foundations constructed on site or anchor bolt gravity foundations are often used. The construction procedures of these foundations are complicated, the construction takes a long time, the amount of concrete and steel bars is large, and the internal materials of the structure are all once. The durability of the structure is poor, and the safety is greatly reduced as the use time increases. In the reinforcement of some existing wind farm concrete foundations, it is necessary to drill holes and insert prestressed anchor bolts for construction. However, the existing prestressed anchor bolt needs to be anchored through the anchor plate at the bottom, which is not suitable for use in the case of drilling. Therefore, it is necessary to develop a fan base structure that can resist huge vertical pull-out force and bending moment while taking into account economical and reliable performance.

Contents of the invention

The purpose of this utility model is to overcome the disadvantages and deficiencies of the existing technology, to provide a prestressed fan foundation device with enlarged head, which is used to fix the upper structure of large wind power generating units, and to provide technical support for the safe operation of land wind farms .

The purpose of this utility model is achieved in that:

1. The expansion head prestressed anchor fan foundation device (referred to as the device)

The device includes foundation caps, anchor rods, high-strength nuts, metal foundation rings, steel sleeves, high-strength concrete, metal connecting rods, upper rotating rods, lower rotating rods, sliding pins, driven pins, fixed pins and expanding heads;

Its location and connection relationship are:

Drilling holes and expansion chambers are evenly arranged in the circumference of the foundation cap, and steel casings are arranged in each drilling hole;

An anchor rod is arranged in the steel casing, and a metal connecting rod, an upper rotating rod and a lower rotating rod are sequentially connected to the bottom end of the anchor rod through a sliding pin, a driven pin and a fixed pin to form an expanding head, and the expanding head is in the expanding chamber;

High-strength concrete is cast in the drilling and expansion chamber of the foundation cap;

A metal base ring and a high-strength nut are sheathed on the top of the steel sleeve.

2. The construction method of the expansion head prestressed anchor fan foundation device (referred to as the method)

This method comprises the following steps:

① Survey and level the site where construction is required to form a foundation cap, and drill to a suitable depth, and then drill a section of expansion room with a special expansion head drill in the lower part of the drill hole as required;

②Fix the anchor rod and the prefabricated expansion head part through the internal thread of the metal connecting rod, put the anchor rod and the expansion head in the folded state, during this process, due to the limitation of the inner diameter of the drilling hole, the upper rotation rod and the lower rotation The rod cannot be stretched to the unfolded state and remains in the folded state;

③ Wait until the bolt is in place and the expansion head enters the expansion room area at the bottom of the drilling hole, and the upper and lower rotating rods are automatically stretched to the unfolded state by gravity;

④ Put the steel casing on the anchor rod, and the bottom end of the steel casing is supported on the top of the metal connecting rod; start from the bottom of the expansion room, and pour high-strength concrete between the drill hole and the steel casing in sequence until the steel casing top;

Pass the prefabricated metal foundation ring through the anchor rod, place it on the poured high-strength concrete, and fix the anchor rod and the metal foundation ring together with high-strength nuts to ensure that the top surface of the metal foundation ring and the top of the foundation cap face on a horizontal plane;

⑥After the age of high-strength concrete reaches the requirement, prestress is applied to the anchor rod protruding from the upper end surface of the foundation cap, so that the concrete is under pressure and the stability of the entire foundation structure is improved.

The utility model has the following advantages and positive effects:

①The expanding angle of the expansion head is relatively large. Compared with the general concrete anchor (cable) foundation, it has a greater vertical pull-out resistance and can resist the huge bending moment transmitted from the upper tower of the wind turbine;

②It only needs to pour concrete in the drilled hole, so the amount of concrete is less, which saves engineering investment; the anchor rod and the expansion head are prefabricated, and can be assembled outside the hole and put into the hole together, which greatly speeds up the construction schedule;

③Use high-strength nuts to connect the expansion head anchor rod and the metal foundation ring as a whole, and use a rigid casing to separate the anchor rod from the concrete to ensure the tension effect of the prestressed anchor rod;

④ Prestressing is applied to the anchor rod, and the pulling force and bending moment are transmitted to the surrounding rock and soil in a larger range through the enlarged head at the bottom of the anchor rod, so that the foundation and the concrete foundation structure share the static force and dynamic load.

In a word, the utility model has a solid foundation, saves engineering investment, and has a fast construction progress. Especially, the expanding head has a greater vertical pull-out resistance and can resist the huge bending moment from the upper tower of the fan.

Description of drawings

Fig. 1 is the structural front view of this device;

Figure 2 is a top view of the structure of the device.

In the picture:

1 - foundation cap, 1.1 - drilling, 1.2 - expansion room;

2—anchor;

3—high-strength nut;

4—metal base ring;

5—steel casing;

6—High-strength concrete;

7—metal connecting rod, 7.1—sliding groove, 7.2—fixed groove;

8—upper rotating rod;

9—lower rotating rod;

10—sliding pin;

11—follower pin;

12—fixed pin;

13—Enlarged head.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail.

1. Device

1. Overall

As shown in Figures 1 and 2, this device includes foundation cap 1, anchor rod 2, high-strength nut 3, metal foundation ring 4, steel casing 5, high-strength concrete 6, metal connecting rod 7, upper rotating rod 8, and lower rotating rod 9 , sliding pin 10, driven pin 11, fixed pin 12 and enlarging head 13;

Its location and connection relationship are:

Drilling holes 1.1 and expansion chambers 1.2 are evenly arranged in the circumference of the foundation cap 1, and steel sleeves 5 are arranged in each drilling hole 1.1;

An anchor rod 2 is arranged inside the steel casing 5, and a metal connecting rod 7, an upper rotating rod 8 and a lower rotating rod 9 are sequentially connected to the bottom end of the anchor rod 2 through a sliding pin 10, a driven pin 11 and a fixed pin 12 to form an enlarged Head 13, the expanding head 13 is in the expanding chamber 1.2;

High-strength concrete 6 is cast in the borehole 1.1 of the foundation cap 1 and the enlarged chamber 1.2;

A metal base ring 4 and a high-strength nut 3 are sheathed on the top of the steel casing 5 .

2. Functional components

The functional parts of this device are common parts or standard parts.

1) Foundation cap 1

The foundation cap 1 is a flattened circular site, with boreholes 1.1 evenly arranged in the circumference, and an expansion chamber 1.2 is arranged at the bottom of the borehole 1.1. It depends on the situation and the design fan capacity.

Its function is the bearing platform of the whole foundation device.

2) Anchor 2

The anchor rod 2 is a fine-rolled threaded steel rod; its bottom end is provided with an external thread, and its top end protrudes from the upper end surface of the foundation cap 1 by about 15 cm.

Its function is for later tensioning and splicing with the lower flange of the fan.

3) High-strength nut 3

The high-strength nut 3 is a common part or a standard part.

Its function is to tightly fix the anchor rod 2 and the metal foundation ring 4 as a whole.

4) Metal base ring 4

The metal foundation ring 4 is a metal ring embedded on the top surface of the foundation cap 1; circular holes are evenly arranged on it, the number of the circular holes is the same as that of the anchor rods 2, and the diameter of the circular holes matches the diameter of the anchor rods 2. The outer diameter of the ring is consistent with the outer diameter of the foundation cap 1 .

Its function is to fix anchor rod 2.

5) Steel casing 5

The steel casing 5 is a hollow long tube, and the inner diameter is 3 to 5 millimeters larger than the outer diameter of the anchor rod 2 .

Its function is to separate the anchor rod 2 from the high-strength concrete 6 .

6) High-strength concrete 6

The high-strength concrete 6 is concrete of C35-C40 grade, which is poured between the borehole 1.1 and the steel casing 5, and inside the expansion chamber 1.2.

Its function is to form the underlying structure.

7) Metal connecting rod 7

Metal connecting rod 7 is a kind of metal rod, its outer diameter is slightly larger than the diameter of anchor rod 2, and its top is provided with the inner thread that is adapted to the outer thread of anchor rod 2, and its upper end is provided with sliding groove 7.1, and its lower end is provided with fixed Slot 7.2;

Its function is that the top end is connected with the anchor rod 2, the upper end is connected with the upper rotating rod 8, and the lower end is connected with the lower rotating rod 9.

8) Upper turning lever 8

The upper rotating rod 8 is a movable metal rod with through holes at the two ends of the front and back in a figure-eight shape. 9 connections;

Its function is to form the enlarged head 13 together with the lower rotating rod 9, and jointly bear the load transmitted from the upper structure.

9) Lower turning lever 9

The lower rotating rod 9 is a movable metal rod with through holes at both ends of the front and back in an inverted splayed shape. The rotating rod 8 is connected;

Its function is to form the enlarged head 13 together with the upper rotating rod 8, and jointly bear the load transmitted from the upper structure.

10) Slide pin 10

Slide pin 10 is a prefabricated metal pin;

Its function is to be used for connecting metal connecting rod 7 and last turning bar 8.

11) Follower pin 11

The driven pin 11 is a prefabricated metal pin;

Its function is to be used for connecting upper rotating rod 8 and following rotating rod 9.

12) Fixed pin 12

Fixed pin 12 is a prefabricated metal pin;

Its function is to be used for connecting lower turning bar 9 and metal connecting rod 7.

13) Expand head 13

It consists of a metal connecting rod 7, an upper rotating rod 8, a lower rotating rod 9, a sliding pin 10, a driven pin 11 and a fixed pin 12.

3. Working principle:

The device is mainly composed of foundation cap 1, anchor rod 2, metal foundation ring 4, high-strength concrete 6 and anchor rod expansion head 13; 10. The driven pin 11 is connected with the fixed pin 12; the sliding pin 12 can freely slide up and down in the sliding groove 7.1 of the metal connecting rod 7; in the freely unfolded state, the up and down rotating rod forms two diamond-shaped expanding heads 13 which are symmetrically fixed on the Both sides of the metal connecting rod 7; after tightly connecting the external thread at the bottom end of the anchor rod 2 and the internal thread at the top of the metal connecting rod 7, put them together into the drill hole 1.1 with the enlarged chamber 1.2 at the bottom, wait for the anchor rod 2 to be in place, The expanding head 13 enters the area of the expanding room 1.2, and the upper rotating rod 8 and the lower rotating rod 9 are automatically stretched to the unfolded state by gravity; after the steel sleeve 5 is placed on the anchor rod 2, high-strength concrete is poured upwards from the bottom of the hole in sequence 6. Fill the expansion chamber 1.2 at the bottom of the borehole 1.1 to the top of the steel casing 2; after the concrete is poured, all the above components are poured in the concrete and become a permanent part of the basic device; after the concrete strength meets the requirements, install the metal The base ring 4 is provided with round holes matching the bolt holes on the bottom flange of the fan tower, and several anchor rods 2 with the same number as the round holes are fixed together with the metal base ring 4 and protrude out of the metal base The upper end surface of the ring 4 has a certain distance, and the tensioning machine is used to apply prestress to the anchor rod 2 so that the concrete is under pressure and the stability of the entire foundation device structure is improved; The nut 3 is fixed, and the lower flange of the fan tower is provided by the fan manufacturer, which is a standard model. The fan manufacturer has detailed technical instructions and drawings for reference.

Claims (2)

1. An expansion head prestressed anchor fan foundation device, characterized in that: Including foundation cap (1), anchor rod (2), high-strength nut (3), metal foundation ring (4), steel casing (5), high-strength concrete (6), metal connecting rod (7), upper rotating rod (8), lower turning rod (9), sliding pin (10), driven pin (11), fixed pin (12) and enlarged head (13); Its location and connection relationship are: Boreholes (1.1) are evenly arranged in the circumference of the foundation cap (1), and a steel casing (5) is arranged in each borehole (1.1); An anchor rod (2) is arranged inside the steel sleeve (5), and a metal connecting rod (7) is sequentially connected to the bottom end of the anchor rod (2) through a sliding pin (10), a follower pin (11) and a fixed pin (12). ), the upper rotating rod (8) and the lower rotating rod (9) form the expanding head (13), and the expanding head (13) is in the expanding chamber (1.2); High-strength concrete (6) is cast in the borehole (1.1) and the enlarged chamber (1.2) of the foundation cap (1); A metal base ring (4) and a high-strength nut (3) are sheathed on the top of the steel casing (5). 2. The expansion head prestressed anchor fan foundation device according to claim 1, characterized in that: The expanding head is composed of a metal connecting rod (7), an upper rotating rod (8), a lower rotating rod (9), a sliding pin (10), a driven pin (11) and a fixed pin (12); The metal connecting rod (7) is a metal rod, its outer diameter is slightly larger than that of the anchor rod (2), and its top end has an internal thread adapted to the external thread of the anchor rod (2), and its upper end is provided with a sliding groove ( 7.1), the lower end of which is provided with a fixing slot (7.2); The upper rotating rod (8) is a movable metal rod with through holes at the two ends of the front and back in a figure-eight shape, and its top end is connected with the sliding groove (7.1) of the metal connecting rod (7) by a sliding pin (10). Connect with the lower turning rod (9) through the follower pin (11); The lower rotating rod (9) is two movable metal rods with through-holes at both ends in an inverted splayed shape. The left and right upper ends are connected with the upper turning rod (8) by follower pins (11).