CN215719245U

CN215719245U - Prestressed steel strand anchoring structure

Info

Publication number: CN215719245U
Application number: CN202122387876.4U
Authority: CN
Inventors: 叶军; 陈俊岭; 陈文升; 汪彦辰; 彭益成; 黄瑞璞
Original assignee: Shanghai Electric Power Design Institute Co Ltd
Current assignee: Shanghai Electric Power Design Institute Co Ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-02-01
Anticipated expiration: 2031-09-30

Abstract

The utility model relates to the technical field of structural engineering and discloses a prestressed steel strand anchoring structure which comprises a bearing plate and an anchoring assembly. Wherein, the anchor subassembly has a plurality ofly, and the bearing plate has one or more, a plurality of anchor subassemblies are connected in the bearing plate, specifically, every anchor subassembly all includes the crab-bolt, conversion equipment and a plurality of prestressing force steel strand wires, the one end of crab-bolt is connected in the bearing plate and is pre-buried in fan basis, the other end of crab-bolt stretches out fan basis and connects in conversion equipment, the one end of a plurality of prestressing force steel strand wires is connected in conversion equipment, the other end stretch-draw is on the top of mixing the tower section, the structure that an crab-bolt corresponds a bearing plate has been avoided, can conveniently adjust the prestressing force of every prestressing force steel strand wire, still can strengthen the wholeness of crab-bolt and bearing plate simultaneously, can also improve construction positioning speed and positioning accuracy.

Description

Prestressed steel strand anchoring structure

Technical Field

The utility model relates to the technical field of structural engineering, in particular to a prestressed steel strand anchoring structure.

Background

Common wind turbine generator system tower has steel tower and steel-concrete combined tower, and the latter has unique advantage under the trend of high tower and large-scale of onshore wind turbines because of having greater rigidity. The upper part of the steel-concrete combined tower is a steel tower section, and the lower part of the steel-concrete combined tower is a concrete tower section. The concrete tower section is usually a prestressed structure, one end of the external prestressed steel strand is anchored into the top of the concrete tower section, and the other end of the external prestressed steel strand is anchored into the wind turbine foundation.

The fan foundation of the steel-concrete combined tower is generally in two forms of a hollow foundation and a solid foundation, wherein the concrete tower section and the hollow foundation are limited by site construction conditions, the quality of a water stopping structure at a basement construction joint is difficult to guarantee, underground water is easy to permeate into the foundation, hidden dangers are caused to corrosion prevention of a tower inner structure and electrical equipment safety, and operation and maintenance workload is greatly increased by pumping water regularly. The solid foundation can avoid the problem of water seepage of the foundation by pouring concrete at one time, but how to anchor the prestressed steel strands in the solid foundation becomes a new problem. The industry has a method of pre-burying a section of steel strand during the construction of a solid foundation for the subsequent connection of the upper steel strand, but if the pre-buried steel strand is connected with the upper steel strand by one-to-one joints, the number of the joints is large, the manufacturing cost is high, and if a multi-to-multi joint is used, the problem of joint overturning is easy to occur during the tensioning due to the low bending rigidity of the steel strand bundle.

Therefore, a prestressed steel strand anchoring structure is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a prestressed steel strand anchoring structure, wherein the stress of a pre-embedded anchor bolt and a prestressed steel strand is uniform, the anchor bolt and the prestressed steel strand have good bending rigidity, the stability of the anchoring structure during tensioning of the prestressed steel strand can be ensured, and the cost can be reduced.

As the conception, the technical scheme adopted by the utility model is as follows:

the utility model provides a prestressing force steel strand anchoring structure, is applicable to steel-concrete combined type fan tower, steel-concrete combined type fan tower includes the steel tower section of upper segment, the mixed tower section of hypomere and is located the fan basis of mixed tower section lower floor, prestressing force steel strand anchoring structure includes:

the bearing plates are arranged and embedded in the fan foundation;

anchor subassembly is equipped with a plurality ofly, a plurality of anchor subassembly connect in the bearing plate, every the anchor subassembly all includes crab-bolt, conversion equipment and a plurality of prestressing force steel strand wires, the one end of crab-bolt connect in bearing plate and pre-buried in the fan basis, the other end of crab-bolt stretches out fan basis and connect in conversion equipment, it is a plurality of prestressing force steel strand wires all one end connect in conversion equipment, other end stretch-draw in the top of mixing the tower section.

Optionally, the conversion device includes a conversion circular truncated cone, an axis of the conversion circular truncated cone is provided with a through hole, the through hole is a threaded hole, and the other end of the anchor bolt penetrates through the through hole and is in threaded connection with the conversion circular truncated cone.

Optionally, the conversion device further comprises a locknut, wherein the locknut is in threaded connection with the other end of the anchor bolt and abuts against one end, far away from the fan foundation, of the conversion circular truncated cone.

Optionally, a plurality of mounting holes are formed in the conversion circular truncated cone at uniform intervals in the circumferential direction, one end of each prestress steel strand penetrates through the corresponding mounting hole in a one-to-one mode, and the prestress steel strands are connected to the conversion circular truncated cone through pier heads.

Optionally, the anchoring assembly further comprises a PVC sleeve, and the PVC sleeve is sleeved on the anchor bolt and embedded in the fan foundation.

Optionally, be provided with the fixed orifices on the bearing plate, the anchor subassembly still includes fixation nut, the one end of crab-bolt is passed fixation orifice and threaded connection in fixation nut, fixation nut butt in the bearing plate deviates from one side of anchor subassembly.

Optionally, the aperture of the fixing hole is 5-9 mm larger than the diameter of the anchor bolt.

Optionally, the number of the bearing plates is one, and the bearing plates are of an annular structure.

Optionally, the bearing plate is provided with a plurality of bearing plates, and the plurality of bearing plates are arranged at intervals.

Optionally, the anchor is a straight anchor.

The utility model has the beneficial effects that:

the prestressed steel strand anchoring structure provided by the utility model comprises a bearing plate and an anchoring assembly, and is suitable for a steel-concrete combined type fan tower frame, wherein the bearing plate is embedded in a fan foundation of the steel-concrete combined type fan tower frame, and the prestressed steel strands in the anchoring assembly need to be stretched at the top end of a concrete tower section of the steel-concrete combined type fan tower frame. Wherein, the anchor subassembly has a plurality ofly, and the bearing plate has one or more, and a plurality of anchor subassemblies are connected in the bearing plate, specifically, and every anchor subassembly all includes crab-bolt, conversion equipment and a plurality of prestressing force steel strand wires, and the one end of crab-bolt is connected in the bearing plate and pre-buried in fan foundation, and fan foundation and connection in conversion equipment are stretched out to the other end of crab-bolt, and the one end of a plurality of prestressing force steel strand wires is connected in conversion equipment, and the other end stretch-draw is in the top of mixing the tower section. Can form on whole crab-bolts are fixed in a bearing plate like this, perhaps a plurality of structures of being fixed in on a bearing plate in the whole crab-bolt, this prestressing force that not only conveniently adjusts every prestressing force stranded wire, the problem of avoiding the uneven and difficult regulation of pre-buried steel strand wires and upper portion prestressing force stranded wire atress that traditional "many to many" connection method leads to still can strengthen the wholeness of crab-bolt and bearing plate simultaneously, can also improve construction positioning speed and positioning accuracy.

Drawings

Fig. 1 is a schematic structural diagram of a steel-concrete combined type wind turbine tower provided by an embodiment of the utility model;

fig. 2 is a schematic structural diagram of a prestressed steel strand anchoring structure provided by an embodiment of the present invention;

fig. 3 is a schematic assembly view of an anchoring structure and a bearing plate according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a converting circular table according to an embodiment of the present invention;

fig. 5 is an exploded schematic view (circular section concrete tower segment) of a prestressed steel strand anchoring structure provided by an embodiment of the present invention;

fig. 6 is a schematic cross-sectional view (circular cross-section concrete tower segment) of a prestressed steel strand anchoring structure provided by an embodiment of the present invention;

FIG. 7 is an enlarged view at A in FIG. 6;

fig. 8 is an exploded schematic view of a prestressed steel strand anchoring structure provided by an embodiment of the present invention (a rounded rectangular cross-section concrete tower segment).

In the figure:

1. a pressure bearing plate; 11. a fixing hole;

2. an anchor assembly; 21. an anchor bolt; 22. a conversion device; 221. converting the circular truncated cone; 2211. a through hole; 2212. mounting holes; 222. a locknut; 23. pre-stressed steel strands; 24. PVC sleeves; 25. fixing a nut;

100. a steel tower section; 200. a mixing tower section; 300. a fan foundation.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1, the steel-concrete combined wind turbine tower has an upper steel tower section 100 and a lower concrete tower section 200, the concrete tower section 200 is usually a prestressed structure, i.e. one end of the prestressed steel strand 23 is anchored into the top of the concrete tower section 200, and the other end is anchored into the wind turbine foundation 300, and the wind turbine foundation 300 of the steel-concrete combined wind turbine tower is usually a cast-in-place reinforced concrete structure, and has two forms, namely a hollow foundation and a solid foundation. The hollow foundation may have the condition that groundwater permeates the inside of foundation, lead to the potential safety hazard, increase fortune dimension work load, and solid foundation disposable concreting then can avoid the problem of foundation infiltration, but when anchor prestressing steel strand wires 23 in solid foundation, if pre-buried steel strand wires and upper portion steel strand wires use one-to-one articulate, then lead to connecting in large quantity, the cost is expensive, but if use many to the polylinkers, then probably because the bending stiffness of steel strand wires is low, appear connecting the problem that topples when the stretch-draw. Then in order to guarantee the stability of the anchoring structure when the steel strand is tensioned, the embodiment provides a prestressed steel strand anchoring structure.

As shown in fig. 2, the prestressed steel strand anchoring structure is partially pre-buried in the wind turbine foundation 300. Specifically, the prestressed steel strand anchoring structure that this embodiment provided includes bearing plate 1 and anchor assembly 2, wherein anchor assembly 2 has a plurality ofly, a plurality of anchor assemblies 2 all are fixed in on bearing plate 1, and bearing plate 1 can set up one or more, and pre-buried in fan basis 300, both can all anchor assemblies 2 be fixed in on a bearing plate 1, also can a plurality ofly in all anchor assemblies 2 be fixed in on a bearing plate 1, this is in order to satisfy the anchor demand of the prestressed steel strand 23 of various cross sectional shape concrete tower sections 200.

The concrete structure of the anchor assemblies 2 is shown in fig. 3, that is, each anchor assembly 2 includes an anchor bolt 21, a conversion device 22 and a plurality of prestressed steel strands 23, wherein one end of the anchor bolt 21 is connected to the bearing plate 1 and pre-embedded in the fan foundation 300, the other end of the anchor bolt 21 extends out of the fan foundation 300 and is connected to the conversion device 22, one end of each prestressed steel strand 23 is connected to the conversion device 22, and the other end is tensioned to the top end of the concrete tower segment 200. That is, in this embodiment, the anchor bolt 21 and the prestressed steel strand 23 are connected to form a whole through the conversion device 22, one end of the whole is connected to the bearing plate 1 embedded in the wind turbine foundation 300, and the other end of the whole is connected to the top end of the concrete tower segment 200, so as to stretch the prestressed steel strand 23. Moreover, under this setting, can form the structure that a plurality of prestressing force steel strand 23 are connected to an crab-bolt 21, this compares with the traditional mode of pre-buried many steel strands in fan foundation 300 earlier, then connecting these many steel strands and many upper portion prestressing force steel strand, the prestressing force of every prestressing force steel strand 23 of regulation that can be more convenient, avoids the problem that the stress of pre-buried steel strand and upper portion prestressing force steel strand that traditional "many to many" connection method leads to is inhomogeneous and difficult to adjust.

In this embodiment, the conversion device 22 includes a conversion circular truncated cone 221, that is, the plurality of prestressed steel strands 23 and the anchor bolt 21 are connected to the conversion circular truncated cone 221, wherein a specific structure of the conversion circular truncated cone 221 is as shown in fig. 4. The axis of the conversion circular truncated cone 221 is provided with a through hole 2211, the through hole 2211 is a threaded hole, the other end of the anchor bolt 21 connected with the conversion circular truncated cone 221 is correspondingly provided with an external thread, and when the other end of the anchor bolt 21 penetrates through the through hole 2211, the anchor bolt 21 and the conversion circular truncated cone 221 can be fixed through threaded connection.

In addition, because the conversion circular truncated cone 221 connected to the anchor bolt 21 is also subjected to the pulling force of the prestressed steel strand 23 tensioned at the top end of the concrete tower segment 200, in order to further ensure the stability of the connection between the anchor bolt 21 and the conversion circular truncated cone 221, as can be seen with reference to fig. 3, in this embodiment, the conversion device 22 further includes a locknut 222. The locking nut 222 is also screwed to the other end of the anchor bolt 21, and optionally, the locking nut 222 and the through hole 2211 have opposite screw threads, for example, when the through hole 2211 is a right-hand screw thread, the locking nut 222 can be set to be a left-hand screw thread, so that when the locking nut 222 is mounted on the anchor bolt 21, the locking nut 222 can be pressed against the conversion circular truncated cone 221.

The prestressed steel strand 23 and the conversion circular truncated cone 221 are assembled by penetrating one end of the prestressed steel strand 23 into the mounting hole 2212 through the mounting holes 2212 arranged on the conversion circular truncated cone 221, and then manufacturing a pier head by a cold heading or hot heading method, namely, the end of the prestressed steel strand 23 is thickened by pressure, so that the prestressed steel strand 23 cannot move upwards and passes through the conversion circular truncated cone 221 as shown in fig. 7, that is, when the other end of the prestressed steel strand 23 is tensioned to the top end of the concrete tower section 200, the pier head abuts against the conversion circular truncated cone 221. Optionally, the mounting holes 2212 are uniformly spaced along the circumferential direction of the conversion circular truncated cone 221, and a prestressed steel strand 23 is inserted into each mounting hole 2212.

In addition, the anchor assembly 2 further includes a fixing nut 25, and the connection of one end of the anchor bolt 21 to the pressure bearing plate 1 also needs to pass through the pressure bearing plate 1 and then be threadedly connected to the fixing nut 25. Specifically, the bearing plate 1 is provided with a fixing hole 11, one end of the anchor bolt 21 passes through the fixing hole 11, and the end is also provided with a thread, after the fixing nut 25 is in threaded connection with the end, it can be understood that the prestressed steel strand 23 tensioned to the concrete tower segment 200 will give the anchor bolt 21 an upward pulling force, and the fixing nut 25 can be pressed against one side of the bearing plate 1 away from the anchoring assembly 2.

Through setting up bearing plate 1, can transmit the prestressed decomposition of crab-bolt 21 to the reinforced concrete structure of fan basis 300, specific bearing plate 1's size then needs to have more prestressing force level and determines through calculation, and 40 ~ 60mm can be taken out to thickness usually, and the material generally chooses for use material Q355 steel. In addition, in the present embodiment, the number of the pressure bearing plates 1 corresponding to the number of the anchor assemblies 2 is not provided, that is, one anchor bolt 21 corresponds to one pressure bearing plate 1, but a plurality of anchor bolts 21 adopt one pressure bearing plate 1, which not only enhances the integrity of the anchor bolts 21 and the pressure bearing plates 1, but also improves the positioning speed and the positioning accuracy of construction.

Specifically, as shown in fig. 5 to 7, the pressure bearing plate 1 of a ring structure may be employed, that is, only one pressure bearing plate 1 may be provided. Because the anchor assemblies 2 are uniformly spaced for the circular-section mixed tower segment, all the anchor bolts 21 can be fixed by arranging the bearing plate 1 with the annular structure, and the design is simpler and more convenient. Alternatively, the fixing holes 11 provided on the bearing plate 1 are also provided at regular intervals.

As shown in fig. 8, the bearing plates 1 may also be provided in plurality, and a plurality of bearing plates 1 are provided at intervals, for example, a rounded rectangular cross-section tower-mixing section, and when only four corners need to be provided with prestressed steel strands 23, the bearing plates 1 may be correspondingly provided only at the positions of the four corners, and optionally, the bearing plates 1 are of a fan-shaped structure. In general, in order to ensure the stress balance of the prestressed steel strand anchoring structure, the anchoring assemblies 2 are symmetrically arranged, that is, the bearing plates 1 are also symmetrically arranged, but it is not necessary to ensure that the shapes of the bearing plates 1 are the same.

Optionally, the anchor assembly 2 further includes a PVC sleeve 24, the PVC sleeve 24 is sleeved on the anchor bolt 21 and embedded in the fan foundation 300, and the PVC sleeve 24 covers a part of the surface of the anchor bolt 21 embedded in the concrete, so as to ensure that the anchor bolt 21 is not bonded with the solid foundation.

Optionally, the aperture of the fixing hole 11 is 5-9 mm larger than the diameter of the anchor bolt 21, and the existence of the gap enables one end of the PVC sleeve 24 to be located in the fixing hole 11, thereby facilitating the fixing of the PVC sleeve 24.

Optionally, in this embodiment, the anchor bolt 21 is a straight anchor bolt, and after being anchored into the fan foundation 300, the anchor bolt is located on the extension of the prestressed steel strand 23, so that the eccentric load of the prestressed steel strand 23 on the anchor bolt 21 can be reduced as much as possible.

The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the utility model, which changes and modifications are within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a prestressing force steel strand anchoring structure, its characterized in that is applicable to steel-concrete combination formula fan tower, steel-concrete combination formula fan tower includes the steel tower section (100) of upper segment, the mixed tower section (200) of hypomere and is located fan basis (300) of mixed tower section (200) lower floor, prestressing force steel strand anchoring structure includes:

the fan foundation structure comprises one or more pressure bearing plates (1), wherein the pressure bearing plates (1) are pre-embedded in the fan foundation (300);

anchor subassembly (2) is equipped with a plurality of, a plurality of anchor subassembly (2) connect in pressure-bearing plate (1), every anchor subassembly (2) all include crab-bolt (21), conversion equipment (22) and a plurality of prestressing force steel strand wires (23), the one end of crab-bolt (21) connect in pressure-bearing plate (1) and pre-buried in fan basis (300), the other end of crab-bolt (21) stretches out fan basis (300) and connect in conversion equipment (22), it is a plurality of prestressing force strand wires (23) homogeneous end connect in conversion equipment (22), other end stretch-draw in the top of mixing tower section (200).

2. The prestressed steel strand anchoring structure according to claim 1, wherein the conversion device (22) comprises a conversion circular truncated cone (221), a through hole (2211) is formed in the axis of the conversion circular truncated cone (221), the through hole (2211) is a threaded hole, and the other end of the anchor bolt (21) is inserted through the through hole (2211) and is in threaded connection with the conversion circular truncated cone (221).

3. The prestressed steel strand anchoring structure according to claim 2, wherein the conversion device (22) further comprises a locknut (222), the locknut (222) is connected to the other end of the anchor bolt (21) in a threaded manner, and abuts against one end of the conversion circular truncated cone (221) away from the fan foundation (300).

4. The prestressed steel strand anchoring structure according to claim 2, wherein a plurality of installation holes (2212) are uniformly arranged at intervals in the circumferential direction of the conversion circular truncated cone (221), one end of each of the plurality of prestressed steel strands (23) is inserted into the installation hole (2212) one by one, and the prestressed steel strands (23) are connected to the conversion circular truncated cone (221) through pier heads.

5. The prestressed steel strand anchoring structure according to claim 1, wherein the anchoring assembly (2) further comprises a PVC sleeve (24), and the PVC sleeve (24) is sleeved on the anchor bolt (21) and embedded in the fan foundation (300).

6. The prestressed steel strand anchoring structure according to claim 1, wherein a fixing hole (11) is provided on the pressure bearing plate (1), the anchoring assembly (2) further comprises a fixing nut (25), one end of the anchor bolt (21) passes through the fixing hole (11) and is in threaded connection with the fixing nut (25), and the fixing nut (25) abuts against one side of the pressure bearing plate (1) departing from the anchoring assembly (2).

7. The prestressed steel strand anchoring structure according to claim 6, wherein the hole diameter of the fixing hole (11) is 5-9 mm larger than the diameter of the anchor bolt (21).

8. The prestressed steel strand anchoring structure according to claim 1, wherein there is one pressure bearing plate (1), and the pressure bearing plate (1) has an annular structure.

9. The prestressed steel strand anchoring structure according to claim 1, wherein the bearing plate (1) is provided in plurality, and the bearing plates (1) are arranged at intervals.

10. The prestressed steel strand anchoring structure according to claim 1, wherein said anchor bolt (21) is a straight anchor bolt.