A loose-beam external cable for a wind power tower and a manufacturing and construction method thereof

Abstract

The present invention discloses a loose-beam external cable for a wind power tower and a manufacturing and construction method thereof, which belongs to the field of wind power tower construction. The steps of manufacturing the external cable include: assembling a fixed end anchor and a tensioning end anchor; installing and tightening a fixed end clip; pressing the clip pressure plate onto the fixed end clip, and the external cable construction steps include: installing a rotatable lifting ring on the clip pressure plate; arranging a lifting point at the top of the tower; fastening the lifting rope on the lifting point to the lifting ring; lifting the entire bundle of the manufactured loose-beam external cable; when the fixed end of the external cable rises to the designed height, placing the entire bundle of external cables at the tensioning end in a pre-buried pipe; installing a Havers pad at the fixed end of the external cable, slowly dropping the external cable, so that the fixed end anchor is installed on the Havers pad; installing the tensioning end anchor; tensioning the steel strand at the tensioning end. The present invention discloses a loose-beam external cable for a wind power tower and a manufacturing and construction method thereof, which can lift multiple steel strands at the same time, improve construction efficiency, and avoid safety issues of falling from a height.

Description

Technical Field

[0001] The invention relates to the field of wind power tower construction, and in particular to a loose-beam external cable for a wind power tower and a manufacturing and construction method thereof. Background Art

[0002] In the prior art, the loose-beam external cable adopts a single-wire installation method, which has the following disadvantages: 1) The single-wire installation method requires a single-wire threading and a single-wire tensioning, which takes a long time to construct; 2) The single steel strand is prone to breakage during the lifting process, causing it to fall from a high altitude, which has a high construction risk;

[0003] Therefore, it is necessary to install multiple steel strands at the same time to solve the above problems. Summary of the invention

[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose a loose-beam external cable and an overall construction method for a wind tower, and to install and lift multiple steel strands at the same time to solve the safety problems of low construction efficiency and high-altitude falling mentioned in the background technology.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a loose-beam external cable for a wind tower, comprising steel strands, wherein the number of the steel strands is at least two; and an anchor, wherein the anchor comprises a fixed-end anchor and a tensioning-end anchor, wherein a plurality of the steel strands are inserted into the fixed-end anchor and exit from the tensioning-end anchor, and the anchor is used to clamp and fix the plurality of the steel strands.

[0007] Preferably, the fixed-end anchor includes a fixed-end anchor plate, which is provided with a plurality of anchor holes for the steel strand to pass through, and the anchor holes are composed of straight holes and tapered holes, the larger opening of the tapered holes faces the side where the steel strand is inserted, and the aperture of the straight holes matches the diameter of the steel strand; it also includes a clip, which is sleeved on the steel strand, and the outer surface of the clip is a tapered surface adapted to the inner surface of the anchor hole, and the clip is embedded in the anchor hole.

[0008] Preferably, the fixed-end anchor also includes a clip pressure plate, which is located on the side of the fixed-end anchor plate where the steel strand is passed through, and the clip pressure plate is connected to the fixed-end anchor plate through upper and lower end locking devices, and the clip pressure plate is used to tighten the clip to ensure that the clip firmly locks the steel strand.

[0009] Preferably, a central section of the clamp pressure plate is an arc-shaped plate, which is used to reduce the distance between the clamp pressure plate and the fixed-end anchor plate, and the arc-shaped opening of the clamp pressure plate faces the side where the steel strand is inserted; the two ends of the clamp pressure plate are straight plates, and the straight plate parts at both ends of the clamp pressure plate are parallel to the fixed-end anchor plate and leave a gap between them.

[0010] Preferably, the end locking device includes an end locking bolt, which passes through the clip pressure plate and extends into the fixed end anchor plate to fix the clip pressure plate and the fixed end anchor plate; it also includes an internal threaded sleeve, which is fixedly arranged inside the fixed end anchor plate and is used to rotatably connect the part of the segment locking bolt that extends into the fixed end anchor plate, while avoiding the phenomenon of thread slippage caused by the end locking bolt being directly connected to the fixed end anchor plate when the end locking bolt is locked; it also includes a bearing plate, which is located between the clip pressure plate and the fixed end anchor plate, and an adjusting spring is arranged between the bearing plate and the fixed end anchor plate, the maximum diameter of the adjusting spring is smaller than the diameter of the bearing plate, and the left and right movement of the bearing plate can control the elongation of the adjusting spring, and then control the elastic force of the adjusting spring; the end locking bolt passes through the bearing plate, but the end locking bolt and the bearing plate are movable, and when the end locking bolt is screwed out or tightened, it does not affect the movement of the bearing plate.

[0011] Preferably, the end locking device also includes an end locking nut, which is fixedly connected to the end locking bolt and is forcefully screwed into one end, and is used to drive the end locking bolt to rotate, thereby tightening or loosening the end locking bolt; the end locking nut is based on the axis of the end locking nut, and is circumferentially provided with anti-slip grooves for preventing slipping, thereby ensuring that no slipping occurs when the end locking nut is rotated.

[0012] Preferably, an anchor plate sealing plate is provided on the side of the fixed-end anchor plate where the steel strand passes through, and polyurethane sealant is applied between the contact surface between the anchor plate sealing plate and the fixed-end anchor plate.

[0013] Preferably, the tensioning end anchor comprises a tensioning end anchor plate, the tensioning end anchor plate is provided with a plurality of anchor holes for the steel strands to pass through, the shape of the anchor holes is a conical hole extending from the right side surface to the left side surface of the tensioning end anchor plate, the larger opening of the conical hole faces the side where the steel strands pass through, and the steel strands are also sleeved by the clip and pass through the tensioning end anchor plate; it also comprises a sealing cylinder, the sealing cylinder is located on the left side of the tensioning end anchor plate, the sealing cylinder penetrates the tensioning end anchor plate but does not penetrate the tensioning end anchor plate, and the diameter of the sealing cylinder is smaller than the diameter of the tensioning end anchor plate; it also comprises oily wax, the oily wax is injected into the sealing cylinder from the outside; it also comprises a tensioning end sealing device, the tensioning end sealing device is located on the left side of the sealing cylinder, and is used to seal the sealing cylinder to prevent the oily wax in the sealing cylinder from leaking out.

[0014] The present invention provides a method for manufacturing a loose-bundle external cable for a wind turbine tower, comprising a loose-bundle external cable for a wind turbine tower as described in any one of claims 1 to 8, and also comprising the following steps: S1, assembling a fixed end anchor and a tensioning end anchor; S2, stripping PE and grease from the surface of the end of the steel strand; S3, installing a fixed end clip; S4, tightening the fixed end clip; S5, pressing a clip pressure plate onto the fixed end clip and fastening it with bolts.

[0015] The present invention provides a method for constructing a loose-bundle external cable for a wind turbine tower, comprising the method for manufacturing a loose-bundle external cable for a wind turbine tower as claimed in claim 9, and further comprising the following steps: S1, installing a rotatable lifting ring on a clamping plate; S2, arranging a lifting point at the top of the tower; S3, fastening the lifting rope on the lifting point to the lifting ring; S4, lifting the entire bundle of manufactured loose-bundle external cables; S5, when the fixed end of the external cable rises to the designed height, placing the entire bundle of external cables at the tensioning end in a pre-buried pipe; S6, installing a Havers pad at the fixed end of the external cable, slowly dropping the external cable, and installing the fixed end anchor on the Havers pad; S7, installing the tensioning end anchor; S8, tensioning the steel strand at the tensioning end.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention combines scattered steel strands into whole-bundle steel strands and lifts the whole-bundle steel strands at one time, which can shorten the installation period of the wind tower external cable to one day. At the same time, the whole-bundle steel strands use clip pressure plates to tighten the clips, so that the clips can lock the steel strands more firmly. Before lifting the external cable body, the fixed end clips are tightened, and the steel strands are effectively anchored by the clips during tensioning and will not fall off, thereby reducing safety hazards in construction;

[0018] 2. End locking devices are provided at both ends of the fixed end anchor plate and the clamping plate. The end locking devices can manually control the screwing amount of the bolt by rotating the bolt to control the tightness between the fixed end anchor plate and the clamping plate. At the same time, an adjusting spring is also provided between the fixed end anchor plate and the clamping plate. When the external cable is hoisted, it plays a buffering role between the fixed end anchor plate and the clamping plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a loose-beam external cable for a wind power tower and an external cable in a manufacturing and construction method provided in a specific embodiment of the present invention;

[0020] Figure 2 It is an enlarged structural diagram of a loose-beam external cable for a wind power tower and an external cable in a manufacturing and construction method provided in a specific embodiment of the present invention.

[0021] In the figure:

[0022] 1. Clip pressure plate; 2. Clip; 3. Fixed end anchor plate; 4. Polyurethane sealant; 5. Anchor plate sealing plate; 6. End locking device; 61. End locking bolt; 611. End locking nut; 62. Load-bearing plate; 63. Adjusting spring; 64. Internal threaded sleeve; 7. Fixing bolt; 8. Steel strand; 9. Tensioning end sealing device; 10. Oily wax; 11. Sealing tube; 12. Tensioning end anchor plate. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0024] like Figure 1 , Figure 2As shown, a loose-bundle external cable for a wind turbine tower provided in this embodiment includes a steel strand 8, wherein the number of the steel strands 8 is at least two; and an anchor is also provided, wherein the anchor includes a fixed-end anchor and a tensioning-end anchor, wherein a plurality of steel strands 8 are inserted into the fixed-end anchor and passed out of the tensioning-end anchor, and the anchor is used to clamp and fix the plurality of steel strands 8. Since the prior art adopts a method of installing a single loose-bundle external cable, the construction time is long, and during the lifting process of a single steel strand 8, the steel strand 8 is prone to breakage and fall from a high altitude, thereby increasing the risk of construction. In the present application, a plurality of loose-bundle steel strands 8 are combined into a whole-bundle external cable 8 to achieve one-time lifting. By this method, The installation period of the separate outer cables is shortened to one day, the installation efficiency is improved by 20%-40%, and multiple steel strands 8 are fixed by anchors to prevent the steel strands 8 from breaking and falling from high altitude during the lifting process, which greatly improves the safety factor of the construction. The cable body steel strands 8 in the present application can be unbonded steel strand harnesses, and the unbonded steel strand harnesses can be made of smooth steel strands, hot-dip galvanized steel strands, and monofilament epoxy-coated steel strands. In the present application, monofilament epoxy-coated steel strands are selected, and the thickness of the epoxy layer is controlled at 0.4mm-0.55mm. A PE protective layer can also be added to the outer surface of the epoxy-coated steel strands, and the thickness of the PE protective layer is not less than 1.5mm.

[0025] In order to strengthen the fixing effect of the fixed end of the steel strand 8, further, the fixed end anchor includes a fixed end anchor plate 3, the fixed end anchor plate 3 is provided with a plurality of anchor holes for the steel strand 8 to pass through, the anchor hole is composed of a straight hole and a tapered hole, the larger opening of the tapered hole is toward the side where the steel strand 8 is inserted, the taper of the tapered hole is 5°-7°, the aperture of the straight hole matches the diameter of the steel strand 8, and the aperture of the straight hole selected in the present application is 17.5mm-20mm; it also includes a clip 2, the clip 2 is sleeved on the steel strand 8, the outer surface of the clip 2 is a tapered surface adapted to the inner surface of the anchor hole, the clip 2 is embedded in the anchor hole, so that the clip 2 can effectively clamp the steel strand 8, and the anchoring rate coefficient can reach above 0.95.

[0026] In order to make the clip 2 lock the steel strand 8 more firmly, the fixed end anchor further includes a clip pressure plate 1. The clip pressure plate 1 is located on the side of the fixed end anchor plate 3 where the steel strand 8 passes through. The clip pressure plate 1 is connected to the fixed end anchor plate 3 through upper and lower end locking devices 6. The clip pressure plate 1 can press the clip 2 tightly so that the clip 2 can firmly lock the steel strand 8.

[0027] The cam 3 is provided at the bottom of the support frame 1, and the cam 3 is provided at the bottom of the support frame 1, so that the cam 3 and the support frame 1 are not loose, and the cam 3 and the support frame 1 are not loose.

[0028] The end locking device 6 further comprises an end locking bolt 61, which penetrates the clip pressure plate 1 and extends into the fixed end anchor plate 3 to fix the clip pressure plate 1 and the fixed end anchor plate 3, and also comprises an internal threaded sleeve 64, which is fixedly arranged inside the fixed end anchor plate 3 and is used to rotate the connecting section locking bolt 61 to extend into the fixed end anchor plate 3, and at the same time avoids the end locking bolt 61 being directly connected to the fixed end anchor plate 3 to cause the end locking bolt 61 to be ... The service life of 61 is shortened. In addition, after long-term use, it will cause the fixed clip pressure plate 1 and the fixed end anchor plate 3 to break. Therefore, the end locking device 6 also needs to be provided with a bearing plate 62, and the bearing plate 62 is located between the clip pressure plate 1 and the fixed end anchor plate 3. An adjusting spring 63 is arranged between the bearing plate 62 and the fixed end anchor plate 3. The maximum diameter of the adjusting spring 63 is smaller than the diameter of the bearing plate 62. The left and right movement of the bearing plate 62 can control the elongation of the adjusting spring 63, and then control the elastic force of the adjusting spring 63; the end locking bolt 61 passes through the bearing plate 62, but the end locking bolt 61 and the bearing plate 62 are movable. When the end locking bolt 61 is unscrewed or tightened, it does not affect the movement of the bearing plate 62. Through the combination of the above means, it can be ensured that when the end locking bolt 61 is locked, the stress buffering of the clip pressure plate 1 and the fixed end anchor plate 3 can be achieved, thereby ensuring the service life of the end locking bolt 61, the clip pressure plate 1 and the fixed end anchor plate 3.

[0029] In order to control the length of the end locking bolt 61 extending into the fixed end anchor plate 3, the end locking device 6 further includes an end locking nut 611, which is fixedly connected to the end locking bolt 61 and forcefully screwed into one end, and is used to drive the end locking bolt 61 to rotate, thereby tightening or loosening the end locking bolt 61; the end locking nut 611 is based on the axis of the end locking nut 611, and is circumferentially provided with anti-slip grooves for preventing slipping, thereby ensuring that no slipping occurs when the end locking nut 611 is rotated, thereby realizing manual adjustment of the spacing and stress state between the clip pressure plate 1 and the fixed end anchor plate 3.

[0030] In order to achieve sealing of the fixed end, an anchor plate sealing plate 5 is further provided on one side of the fixed end anchor plate 3 where the steel strand 8 passes through, and polyurethane sealant 4 is applied between the contact surface between the anchor plate sealing plate 5 and the fixed end anchor plate 3, and the anchor plate sealing plate 5 is fixed to the fixed end anchor plate 3 by fixing bolts 7.

[0031] In order to achieve the fixing effect of the tensioning end, further, the tensioning end anchor includes a tensioning end anchor plate 12, and the tensioning end anchor plate 12 is provided with a plurality of anchor holes for the steel strand 8 to pass through. The shape of the anchor hole is a conical hole extending from the right side surface of the tensioning end anchor plate 12 to the left side surface, and the larger opening of the conical hole passes through one side toward the steel strand 8. The steel strand 8 is also sleeved by the clip 2 and passes through the tensioning end anchor plate 12; it also includes a sealing cylinder 11, which is located on the left side of the tensioning end anchor plate 8. The sealing cylinder 11 penetrates the tensioning end anchor plate 8 but does not penetrate the tensioning end anchor plate 8. The diameter of the sealing cylinder 11 is smaller than the diameter of the tensioning end anchor plate 8; it also includes oily wax 10, which is injected into the sealing cylinder 11 from the outside; it also includes a tensioning end sealing device 9, which is located on the left side of the sealing cylinder 11, and is used to seal the sealing cylinder 11 to prevent the oily wax 10 in the sealing cylinder 11 from leaking out.

[0032] A method for manufacturing a dispersed-beam external cable for a wind power tower provided in this embodiment includes the following steps:

[0033] S1. Assemble the fixed end anchor and the tension end anchor;

[0034] S2. Strip off the PE and grease on the surface of the steel strand end;

[0035] S3, install the fixed end clip;

[0036] S4, tighten the fixed end clip;

[0037] S5. Press the clamp pressure plate onto the fixed end clamp and tighten it with bolts.

[0038] A method for constructing a loose-beam external cable for a wind power tower provided in this embodiment includes the following steps:

[0039] S1. Install the rotatable lifting ring on the clamping plate;

[0040] S2. Arrange the hanging point at the top of the tower;

[0041] S3. Tie the lifting rope on the lifting point to the lifting ring;

[0042] S4, lifting the prepared loose-beam type external cables as a whole bundle;

[0043] S5. When the fixed end of the external cable rises to the designed height, place the entire bundle of external cables at the tensioning end in the embedded pipe;

[0044] S6. Install a Havers pad at the fixed end of the external cable, and slowly lower the external cable so that the fixed end anchor is installed on the Havers pad;

[0045] S7. Install the tension end anchor;

[0046] S8. Tension the steel strand at the tensioning end.

[0047] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. A loose-beam external cable for a wind power tower, characterized in that: include: Steel strands (8), the number of the steel strands (8) being at least two; Anchorage, the anchorage comprising a fixed end anchorage and a tension end anchorage, the plurality of steel strands (8) passing through the fixed end anchorage and passing through the tension end anchorage, the anchorage being used to clamp and fix the plurality of steel strands (8); The fixed end anchor comprises: A fixed end anchor plate (3), the fixed end anchor plate (3) being provided with a plurality of anchor holes for the steel strand (8) to pass through, the anchor holes being composed of straight holes and tapered holes, the tapered holes having a larger opening facing the side where the steel strand (8) passes through, and the diameter of the straight holes matching the diameter of the steel strand (8); A clip (2), the clip (2) being sleeved on the steel strand (8), the outer surface of the clip (2) being a conical surface adapted to the inner surface of the anchor hole, and the clip (2) being embedded in the anchor hole; The fixed end anchor also includes: A clip pressure plate (1), the clip pressure plate (1) being located on the side of the fixed end anchor plate (3) through which the steel strand (8) is inserted, the clip pressure plate (1) being connected to the fixed end anchor plate (3) via upper and lower end locking devices (6), the clip pressure plate (1) being used to tighten the clip (2) to ensure that the clip (2) firmly locks the steel strand (8); The end locking device (6) comprises: An end locking bolt (61), the end locking bolt (61) passing through the clip pressure plate (1) and extending into the fixed end anchor plate (3), and being used to fix the clip pressure plate (1) and the fixed end anchor plate (3); An internally threaded screw sleeve (64), the internally threaded screw sleeve (64) being fixedly arranged inside the fixed end anchor plate (3) and being used for rotationally connecting the portion of the end locking bolt (61) extending into the fixed end anchor plate (3), while preventing the end locking bolt (61) from being directly connected to the fixed end anchor plate (3) and causing the end locking bolt (61) to be thread-slipped when being locked; A load-bearing plate (62), the load-bearing plate (62) being located between the clip pressure plate (1) and the fixed end anchor plate (3), an adjustment spring (63) being arranged between the load-bearing plate (62) and the fixed end anchor plate (3), the maximum diameter of the adjustment spring (63) being smaller than the diameter of the load-bearing plate (62), and the left-right movement of the load-bearing plate (62) being able to control the elongation of the adjustment spring (63), thereby controlling the elastic force of the adjustment spring (63); The end locking bolt (61) passes through the load-bearing plate (62), but the end locking bolt (61) and the load-bearing plate (62) are movable, and when the end locking bolt (61) is screwed out or tightened, the movement of the load-bearing plate (62) is not affected.

2. A loose-beam external cable for a wind power tower according to claim 1, characterized in that: A central section of the clip pressure plate (1) is an arc-shaped plate, which is used to reduce the distance between the clip pressure plate (1) and the fixed end anchor plate (3), and the arc-shaped opening of the clip pressure plate (1) faces the side where the steel strand (8) is inserted; Both ends of the clamping plate (1) are straight plates, and the straight plate parts at both ends of the clamping plate (1) are parallel to the fixed end anchor plate (3) and a gap is left between the fixed end anchor plate (3).

3. The loose-beam external cable for a wind power tower according to claim 1, characterized in that: The end locking device (6) further comprises: An end locking nut (611), the end locking nut (611) being fixedly connected to the end locking bolt (61) and being screwed inward at one end to drive the end locking bolt (61) to rotate, thereby tightening or loosening the end locking bolt (61); The end locking nut (611) is provided with anti-skid patterns in the circumferential direction with the axis of the end locking nut (611) as a reference, thereby ensuring that the end locking nut (611) will not slip when rotating.

4. The loose-beam external cable for a wind power tower according to claim 1, characterized in that: An anchor plate sealing plate (5) is provided on one side of the fixed end anchor plate (3) through which the steel strand (8) passes, and polyurethane sealant (4) is applied between the contact surface between the anchor plate sealing plate (5) and the fixed end anchor plate (3), and the anchor plate sealing plate (5) is fixed to the fixed end anchor plate (3) by fixing bolts (7).

5. The loose-beam external cable for a wind power tower according to claim 1, characterized in that: The tension end anchor comprises: A tensioning end anchor plate (12), the tensioning end anchor plate (12) being provided with a plurality of anchor holes for the steel strand (8) to pass through, the anchor holes being in the shape of tapered holes extending from the right side surface of the tensioning end anchor plate (12) to the left side surface, the larger opening of the tapered hole being directed toward the side where the steel strand (8) passes through, the steel strand (8) also being sleeved by the clip (2) and then passing through the tensioning end anchor plate (12); a sealing cylinder (11), the sealing cylinder (11) being located on the left side of the tensioning end anchor plate (12), the sealing cylinder (11) penetrating the tensioning end anchor plate (12) but not penetrating the tensioning end anchor plate (12), and the diameter of the sealing cylinder (11) being smaller than the diameter of the tensioning end anchor plate (12); Oily wax (10), the oily wax (10) is injected into the sealing tube (11) from the outside; A tensioning end sealing device (9), the tensioning end sealing device (9) is located on the left side of the sealing cylinder (11) and is used to seal the sealing cylinder (11) to prevent the oily wax (10) in the sealing cylinder (11) from leaking out.

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