阅读说明：本技术 风力发电机扩底锚索基础真型疲劳试验联接装置 (True fatigue test connecting device for expanded-base anchor cable foundation of wind driven generator ) 是由 冯树臣 顾玉春 曲忠侃 詹俊桥 贾广学 吕宏 单永波 于 2020-07-06 设计创作，主要内容包括：一种风力发电机扩底锚索基础真型疲劳试验联接装置,解决现有技术存在的因高频次磨损导致疲劳试验失败,试验准确性差,不利于安全生产的问题。包括设置在地下岩层内竖直孔里的若干根钢绞线,其特征在于：钢绞线位于地面以上的一段的上部设置有绞线连接端,各根钢绞线的绞线连接端分别与工作锚盘相连；工作锚盘上方设置有连接套筒,连接套筒下端与工作锚盘相连,连接套筒的上端,通过连接杆与疲劳试验机加荷板相连；连接杆上设置有锁紧螺母,疲劳试验机加荷板的上侧设置有加荷螺母。其设计合理,结构紧凑,可确保锚索连接端与疲劳试验机加荷载端的连接稳固程度,使疲劳试验次数满足工况要求,试验准确性高,利于安全生产。(The utility model provides a wind-driven generator expands real type fatigue test coupling device of end anchor rope basis, solves that prior art exists because of high frequency wearing and tearing lead to fatigue test failure, and experimental accuracy is poor, is unfavorable for the problem of safety in production. Including setting up a plurality of steel strands in the vertical hole in the underground rock stratum, its characterized in that: the upper part of the section of the steel strand above the ground is provided with a strand connecting end, and the strand connecting end of each steel strand is respectively connected with the working anchor disc; a connecting sleeve is arranged above the working anchor disc, the lower end of the connecting sleeve is connected with the working anchor disc, and the upper end of the connecting sleeve is connected with a loading plate of the fatigue testing machine through a connecting rod; the connecting rod is provided with a locking nut, and the upper side of the loading plate of the fatigue testing machine is provided with a loading nut. Its reasonable in design, compact structure can ensure the anchor rope link and the fatigue testing machine and add the firm degree of being connected of load end, makes the fatigue test number of times satisfy the operating mode requirement, and experimental accuracy is high, does benefit to the safety in production.)

1. The utility model provides a true type fatigue test coupling device of aerogenerator club-footed anchor rope basis, is including setting up a plurality of steel strand wires (3) in vertical hole (1) in underground rock stratum (5), its characterized in that: the steel strands (3) are positioned at the upper part of the section above the ground and are provided with strand connecting ends (7), and the strand connecting ends (7) of the steel strands (3) are respectively connected with a working anchor disc (8); a connecting sleeve (10) is arranged above the working anchor disc (8), the lower end of the connecting sleeve (10) is connected with the working anchor disc (8), and the upper end of the connecting sleeve (10) is connected with a loading plate (13) of the fatigue testing machine through a connecting rod; and locking nuts (11) are respectively arranged between the top of the connecting rod and the connecting sleeve (10) and the lower side of the loading plate (13) of the fatigue testing machine, and loading nuts (14) are arranged on the upper side of the loading plate (13) of the fatigue testing machine.

2. The wind driven generator bottom-expanding anchor cable foundation true fatigue test coupling device as claimed in claim 1, wherein: the working anchor plate (8) is composed of an anchor plate main body (21), a plurality of conical through holes (23) are uniformly distributed along the circumference on the anchor plate main body (21), and the conical through holes (23) adopt a conical structural form with a large upper end and a small lower end; the stranded wire connecting ends (7) of the steel stranded wires (3) respectively penetrate through the conical through holes (23), and conical limiting wedges (24) are arranged between the outer portions of the stranded wire connecting ends (7) and the inner walls of the corresponding conical through holes (23).

3. The wind driven generator bottom-expanding anchor cable foundation true fatigue test coupling device as claimed in claim 2, wherein: the conical limiting wedges (24) comprise two symmetrically arranged limiting wedges (25), the cross sections of the limiting wedges (25) are arc-shaped sections (28), and the inner sides of the arc-shaped sections (28) of the two symmetrically arranged limiting wedges (25) are enclosed to form a stranded wire clamping cavity (29) for clamping the stranded wire connecting end (7); the upper part of the limiting wedge block (25) is provided with a wedge block wide end (27), and the lower part of the limiting wedge block (25) is provided with a wedge block narrow end (26).

4. The wind driven generator bottom-expanding anchor cable foundation true fatigue test coupling device as claimed in claim 1, wherein: the connecting sleeve (10) is composed of a cylindrical sleeve main body (15), a sleeve through hole (16) is formed in the middle of the sleeve main body (15), an anchor disc connecting portion (17) is arranged at the lower end of the sleeve through hole (16), and a connecting rod connecting portion (19) is arranged at the upper end of the sleeve through hole (16).

5. The wind driven generator bottom-expanding anchor cable foundation true fatigue test coupling device as claimed in claim 4, wherein: an anchor disc connecting internal thread (18) is arranged on an anchor disc connecting part (17) at the lower end of a sleeve through hole (16) of the connecting sleeve (10), and correspondingly, a sleeve connecting external thread (22) is arranged on the outer side wall of an anchor disc main body (21) of the working anchor disc (8); the connecting rod connecting part (19) at the upper end of the sleeve through hole (16) of the connecting sleeve (10) is provided with a connecting rod connecting internal thread (20), and the connecting rod is a double-thread connecting rod (12).

6. The wind driven generator bottom-expanding anchor cable foundation true fatigue test coupling device as claimed in claim 2, wherein: the upper portion of work anchor dish (8) is provided with middle spacing pad (9), and middle spacing pad (9) comprise disc spacing pad main part (30), are provided with a plurality of, quantity and position all with work anchor dish (8) toper through-hole (23) corresponding through hole (31) on spacing pad main part (30).

Technical Field

The invention belongs to the technical field of wind power generation, and particularly relates to a true fatigue test connecting device for a bottom-expanded anchor cable foundation of a wind driven generator, which can ensure the connection stability of an anchor cable connecting end and a loading end of a fatigue testing machine, enables the frequency of fatigue tests to meet the working condition requirements, has high test accuracy and is beneficial to safe production.

Background

The existing anchor cable prestress foundation structure of the wind driven generator comprises a concrete bearing platform, wherein a fixed part of the wind driven generator is arranged in the concrete bearing platform, and the upper part of the concrete bearing platform is connected with the bottom of a wind turbine tower cylinder through a bolt. Straight holes are formed below the edge of the concrete bearing platform, the straight holes are uniformly distributed on the circumference taking the fixing part as the center, and the bottom of each straight hole is communicated with the bottom expanding hole below the straight hole; a plurality of steel strands are respectively arranged in the straight holes, and the bottom ends of the steel strands are provided with anchoring parts arranged in the bottom expanding holes; and the upper ends of the steel strands are fixed above the concrete bearing platform through positioning anchor disks. However, as a special steel reinforced concrete structure, the deformation of the tower and the concrete cannot be coordinated and consistent in the bearing process due to different performances of the two materials; under the action of high-cycle repeated fatigue load, the bond stress between the tower drum and the concrete disappears along with vibration, and the tower drum wall and the foundation ring are separated. Particularly, the concrete on the surface of the base on the leeward side is easy to be locally damaged under the repeated pressure and impact action of the tower; therefore, fatigue tests need to be carried out on the expanded-base anchor cable foundation of the wind driven generator.

However, in the fatigue test of the bottom-expanded anchor cable foundation of the wind driven generator at present, a mode that a loading end of a fatigue testing machine is directly connected with the upper end part of an anchor cable is adopted. In the traditional fatigue test connection mode, the anchor cable connection end can drive the limiting wedge in the positioning anchor disc to repeatedly move in the anchor disc hole in the repeated loading process of the fatigue test machine; therefore, when the loading times required by the test are not reached, the fatigue test failure of the bottom-expanded anchor cable foundation of the wind driven generator is caused because the connecting end of the anchor cable is abraded with the limiting wedge for a high frequency and is firstly broken with the fatigue test of the anchor cable. In addition, some simulation tests of the pedestal-extended anchor cable foundation of the wind driven generator based on the laboratory have large difference with the complex working conditions of a construction site, and are not favorable for safety production due to poor test accuracy. Therefore, the fatigue test mode and the device of the expanded-base anchor cable foundation of the wind driven generator in the prior art need to be improved.

Disclosure of Invention

The invention aims at the problems and provides a device capable of ensuring the stable connection between the anchor cable connecting end and the loading end of a fatigue testing machine, so that the transmission of the force of the fatigue test is closer to the operating condition of a fan. Wind load of the wind driven generator is transmitted to the concrete foundation bearing platform through the tower barrel, and the foundation bearing platform is transmitted to the anchor disc at the top end of the anchor cable. The anchor plate transmits to prestressed anchorage cable, and the anchor rope bottom bears the weight of the version and transmits for the concrete of expanding the tip, finally transmits for the massif. The invention provides a true fatigue test connecting device for a fan-bottom-expanded anchor cable foundation of a wind driven generator according to the basic principle of fan force transmission.

The technical scheme adopted by the invention is as follows: this aerogenerator expands real type fatigue test connecting device of end anchor rope basis includes a plurality of steel strands of setting in the vertical hole in the underground rock stratum, its characterized in that: the steel stranded wires are positioned at the upper part of the section above the ground and are provided with stranded wire connecting ends, and the stranded wire connecting ends of the steel stranded wires are respectively connected with the working anchor disc; a connecting sleeve is arranged above the working anchor disc, the lower end of the connecting sleeve is connected with the working anchor disc, and the upper end of the connecting sleeve is connected with a loading plate of the fatigue testing machine through a connecting rod; and locking nuts are respectively arranged between the connecting rod and the top of the connecting sleeve and the lower side of the loading plate of the fatigue testing machine, and the loading nut is arranged on the upper side of the loading plate of the fatigue testing machine.

The working anchor plate is composed of an anchor plate main body, a plurality of conical through holes are uniformly distributed along the circumference on the anchor plate main body, and the conical through holes are in a conical structural form with a large upper end and a small lower end; the stranded wire connecting ends of the steel stranded wires penetrate through the conical through holes respectively, and conical limiting wedges are arranged between the outer portions of the stranded wire connecting ends and the inner walls of the corresponding conical through holes. The tapered limiting wedges arranged in the tapered through holes of the working anchor disk are used for preventing the stranded wire connecting ends of the steel stranded wires from moving downwards, and the anchoring effect of the working anchor disk is ensured.

The conical limiting wedges comprise two symmetrically arranged limiting wedges, the cross sections of the limiting wedges are arc-shaped sections, and the inner sides of the arc-shaped sections of the two symmetrically arranged limiting wedges enclose to form a stranded wire clamping cavity for clamping and fixing the stranded wire connecting end; the upper part of the limiting wedge block is provided with a wedge block wide end, and the lower part of the limiting wedge block is provided with a wedge block narrow end. The stranded wire connecting end of the steel stranded wire is reliably clamped by a stranded wire clamping cavity formed by enclosing two symmetrically arranged limiting wedge blocks.

The connecting sleeve comprises cylindrical sleeve main part, and the middle part of sleeve main part is provided with the sleeve through-hole, and the lower extreme of sleeve through-hole is provided with anchor disc connecting portion, and the upper end of sleeve through-hole is provided with connecting rod connecting portion. So as to be connected with the working anchor plate through the anchor plate connecting part at the lower end of the sleeve through hole of the connecting sleeve and connected with the connecting rod through the connecting rod connecting part at the upper end of the sleeve through hole.

An anchor plate connecting internal thread is arranged on the anchor plate connecting part at the lower end of the sleeve through hole of the connecting sleeve, and correspondingly, a sleeve connecting external thread is arranged on the outer side wall of the anchor plate main body of the working anchor plate; the connecting rod connecting portion of connecting sleeve's sleeve through-hole upper end is provided with the connecting rod and connects the internal thread, just the connecting rod is double thread connecting rod. Connecting the anchor plate connecting part of the connecting sleeve with the outer side wall of the working anchor plate by utilizing the anchor plate connecting internal thread and the sleeve connecting external thread; and the connecting rod connecting part of the connecting sleeve is connected with the lower end of the double-thread connecting rod through the connecting rod connecting inner thread, and the upper end of the double-thread connecting rod is connected with the loading plate of the fatigue testing machine.

The upper portion of the working anchor plate is provided with a middle limiting pad, the middle limiting pad is composed of a disc-shaped limiting pad main body, and the limiting pad main body is provided with a plurality of through holes, the number of the through holes and the positions of the through holes correspond to the conical through holes of the working anchor plate. The middle limiting pad is arranged above the working anchor disc, so that the conical limiting wedge arranged in the working anchor disc and in the repeated loading process of the fatigue testing machine is prevented from being separated from the upper end of the conical through hole, and the fatigue test is ensured to be smoothly carried out.

The invention has the beneficial effects that: because the upper part of the section of the steel strand above the ground is provided with the strand connecting end, and the strand connecting end of each steel strand is respectively connected with the working anchor disc; a connecting sleeve is arranged above the working anchor disc, the lower end of the connecting sleeve is connected with the working anchor disc, and the upper end of the connecting sleeve is connected with a loading plate of the fatigue testing machine through a connecting rod; between connecting rod and connecting sleeve top and fatigue testing machine loading board downside, be provided with lock nut respectively, fatigue testing machine loading board upside sets up the structural style of loading nut, so its reasonable in design, compact structure can ensure the anchor rope link and the firm degree of being connected of fatigue testing machine loading end, makes fatigue testing's number of times can satisfy the operating mode requirement, and experimental accuracy is high, does benefit to the safety in production.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention.

Fig. 2 is a schematic illustration of a construction of the coupling sleeve of fig. 1.

Figure 3 is a schematic view of a construction of the work anchor disc of figure 1.

Fig. 4 is a cross-sectional view taken along line a-a of fig. 3.

Figure 5 is a schematic view of a tapered stop wedge of figure 4.

Fig. 6 is a top view of fig. 5.

FIG. 7 is a schematic view of the two stop wedges of FIG. 5 shown in a separated configuration.

Fig. 8 is a schematic view of a structure of the middle position-limiting pad of fig. 1.

Fig. 9 is a cross-sectional view taken along line B-B of fig. 8.

The sequence numbers in the figures illustrate: the concrete grouting material comprises 1 vertical hole, 2 bottom expanding holes, 3 steel strands, 4 grouting materials, 5 underground rock stratums, 6 backing plates, 7 strand connecting ends, 8 working anchor disks, 9 middle limiting pads, 10 connecting sleeves, 11 locking nuts, 12 double-thread connecting rods, 13 fatigue testing machine loading plates, 14 loading nuts, 15 sleeve bodies, 16 sleeve through holes, 17 anchor disk connecting parts, 18 anchor disk connecting internal threads, 19 connecting rod connecting parts, 20 connecting rod connecting internal threads, 21 anchor disk bodies, 22 sleeve connecting external threads, 23 conical through holes, 24 conical limiting wedges, 25 limiting wedges, 26 wedge narrow ends, 27 wedge wide ends, 28 arc-shaped cross sections, 29 strand clamping cavities, 30 limiting pad bodies and 31 straight through holes.

Detailed Description

The specific structure of the present invention will be described in detail with reference to FIGS. 1 to 9. The connecting device for the true fatigue test of the foundation of the bottom-expanded anchor cable of the wind driven generator comprises a plurality of (for example, 5, 7 or 9) steel stranded wires 3 arranged in vertical holes 1 in an underground rock stratum 5, bottom-expanded holes 2 are arranged at the bottoms of the vertical holes 1 in the underground rock stratum 5, and grouting materials 4 are poured into the vertical holes 1 and the bottom-expanded holes 2. The steel strands 3 are positioned at the upper part of the section above the ground and are provided with strand connecting ends 7, and the strand connecting ends 7 of the steel strands 3 are respectively connected with a working anchor disk 8; meanwhile, a square base plate 6 is arranged between the working anchor plate 8 and the ground.

The working anchor plate 8 is composed of a disc-shaped anchor plate main body 21, and a plurality of conical through holes 23 which are uniformly distributed along the circumference and the number of which is corresponding to that of the steel strands 3 (for example, 5, 7 or 9) are arranged on the anchor plate main body 21; and each tapered through hole 23 adopts a tapered structure form with a large upper end and a small lower end. The stranded wire connecting end 7 of each steel stranded wire 3 respectively passes through each conical through hole 23, and a conical limiting wedge 24 is arranged between the outside of each stranded wire connecting end 7 and the inner wall of the corresponding conical through hole 23. The conical limiting wedge 24 arranged in the conical through hole 23 comprises two symmetrically arranged limiting wedges 25, and the cross section of each limiting wedge 25 is an arc-shaped section 28; and the inner sides of the arc-shaped sections 28 of the two symmetrically arranged limiting wedges 25 are enclosed to form a stranded wire clamping cavity 29 for clamping the stranded wire connecting end 7. The upper part of the limiting wedge 25 is provided with a wedge wide end 27, and the lower part of the limiting wedge 25 is provided with a wedge narrow end 26; and then a stranded wire clamping cavity 29 formed by enclosing two symmetrically arranged limiting wedge blocks 25 is utilized to reliably clamp the stranded wire connecting end 7 of the steel stranded wire 3 so as to prevent the stranded wire connecting end 7 of the steel stranded wire 3 from moving downwards and ensure the anchoring effect of the working anchor disc 8.

A connecting sleeve 10 is arranged above the working anchor disc 8, the connecting sleeve 10 is composed of a cylindrical sleeve main body 15, and a sleeve through hole 16 is formed in the middle of the sleeve main body 15; the lower end of the sleeve through hole 16 is provided with an anchor plate connecting part 17, and an anchor plate connecting internal thread 18 is arranged on the anchor plate connecting part 17; correspondingly, the outer side wall of the anchor disc main body 21 of the working anchor disc 8 is provided with a sleeve connecting external thread 22; so as to connect the anchor plate connection portion 17 of the attachment sleeve 10 to the outer side wall of the working anchor plate 8 by means of the mating connection of the anchor plate connection internal thread 18 and the sleeve connection external thread 22. Meanwhile, a connecting rod connecting part 19 is arranged at the upper end of the sleeve through hole 16, a connecting rod connecting internal thread 20 is arranged on the connecting rod connecting part 19, the connecting rod connecting internal thread 20 is further connected through a connecting rod, the connecting rod connecting part 19 of the connecting sleeve 10 is connected with the lower end of the double-thread connecting rod 12, and the upper end of the double-thread connecting rod 12 is connected with the loading plate 13 of the fatigue testing machine.

An intermediate limiting pad 9 for limiting the position of the conical limiting wedge 24 is further arranged above the working anchor disc 8 and in the sleeve through hole 16 of the connecting sleeve 10. The middle limit pad 9 is composed of a disc-shaped limit pad main body 30, and a plurality of through holes 31 with the number and the positions corresponding to the conical through holes 23 of the working anchor plate 8 are arranged on the limit pad main body 30. Therefore, the phenomenon that the conical limiting wedge 24 arranged in the working anchor disc 8 is separated from the upper end of the conical through hole 23 in the repeated loading process of the fatigue testing machine is effectively avoided through the middle limiting pad 9 arranged above the working anchor disc 8, and the fatigue test is ensured to be smoothly carried out. And, between the top of double-end threaded connecting rod 12 and connecting sleeve 10 and the downside of fatigue testing machine loading plate 13, be provided with lock nut 11 respectively, the upside of fatigue testing machine loading plate 13 is provided with loading nut 14.

When the connecting device for the base-expanding anchor cable foundation true fatigue test of the wind driven generator is used, firstly, the anchor disc connecting internal thread 18 of the connecting sleeve 10 is matched and connected with the sleeve connecting external thread 22 of the working anchor disc 8, and the anchor disc connecting part 17 of the connecting sleeve 10 is connected with the outer side wall of the working anchor disc 8. Meanwhile, the connecting rod connecting part 19 of the connecting sleeve 10 is connected with the lower end of the double-thread connecting rod 12 through the connecting rod connecting internal thread 20 of the connecting sleeve 10; and the upper end of the double-thread connecting rod 12 is connected with a loading plate 13 of the fatigue testing machine. And then, starting a fatigue testing machine, and repeatedly loading the connecting sleeve 10 connected with the double-thread connecting rod 12 and the working anchor disc 8 connected with the lower end of the connecting sleeve by using a loading end so as to perform fatigue test on the bottom-expanded anchor cable foundation of the wind driven generator. In the whole process of long-time and repeated loading of the fatigue testing machine, the test connecting ends of the steel strands reliably clamp the strand connecting ends 7 of the steel strands 3 by utilizing a strand clamping cavity 29 formed by enclosing two symmetrically-arranged limiting wedges 25 in the conical through holes 23 of the working anchor plate 8, so that the strand connecting ends 7 of the steel strands 3 are prevented from moving downwards, and the anchoring effect of the working anchor plate 8 is ensured; and through the middle limit pad 9 arranged above the working anchor disk 8, the phenomenon that the conical limit wedge 24 arranged in the working anchor disk 8 is separated from the upper end of the conical through hole 23 in the repeated loading process of the fatigue testing machine is effectively avoided, so that the fatigue test is smoothly carried out.