An adjustable wire length connecting fitting, tension string and quick tensioning method

Abstract

This invention relates to an adjustable wire length connecting hardware structure, a tension string, and a rapid wire tightening method. The connecting hardware structure includes: a PT adjusting plate, which is elongated and has multiple evenly distributed adjusting holes; a DB adjusting plate, which is fan-shaped and has multiple evenly distributed adjusting holes along its arc-shaped edge; and a turnbuckle with a bidirectional rotating threaded adjustment mechanism. The PT adjusting plate, DB adjusting plate, and turnbuckle are connected in any of the following ways to constitute the hardware structure: a first combination includes interconnected PT adjusting plates and turnbuckles; a second combination includes DB adjusting plates and turnbuckles; and a third combination includes PT adjusting plates, DB adjusting plates, and turnbuckles. This invention integrates the turnbuckle, PT / DB adjusting plates, and supporting tools into a cooperating system, achieving a combination of wide-range coverage and precise fine-tuning, capable of handling most sag adjustment needs.

Description

Technical Field

[0001] This invention belongs to the field of power transmission line construction technology, specifically relating to an adjustable line length connecting fitting, a tension string, and a rapid tensioning method. Background Technology

[0002] In the construction of important crossing lines such as existing power transmission lines, railways, and highways, the property owners have high requirements for both short crossing time and high crossing safety. Under conventional stringing methods, after the conductor is laid in place, six on-site work procedures are required: hanging wire on one side, sag observation, wire tightening, marking, crimping, and hanging wire on the other side. Hanging wire takes little time, while wire tightening and marking consume most of the construction time. This long stringing time leads to prolonged power outages when crossing transmission lines, high operational safety requirements for railways and highways, high risks during stringing, and a high degree of construction difficulty. After the conductor is laid, if the sag value does not meet the design requirements, conductor sag adjustment is necessary. During construction, the sag value is often adjusted and observed simultaneously until the set requirements are met. However, it is impossible to accurately adjust the conductor length compensation to the design sag value in one go during sag adjustment. The lack of hardware with accurate fine-tuning capabilities for conductor length results in long wire tightening operations. If the conductor sag does not meet the design requirements, it may even lead to rework of the stringing operation, further increasing the workload and risks of the stringing work.

[0003] CN115632344A proposes a fitting and method for precisely adjusting the length of insulator strings. It replaces the adjustment plate (DB plate or PT plate) with a novel fitting, using a fitting whose length can be precisely adjusted to adjust the length of two insulator strings, achieving stepless length adjustment. However, the adjustment range of this patent is too small, only 50mm, which does not meet the requirements for adjusting conductor sag. CN205354771U provides an adjustable hanging point spacing type double tension insulator string that allows adjustment of the hanging point spacing of parallel insulator strings according to actual installation and use requirements. However, this patent does not provide a method for adjusting the conductor length and cannot achieve rapid and precise adjustment of the conductor length, making it impossible to quickly and accurately meet the design requirements for conductor sag.

[0004] Therefore, there is an urgent need to propose a new type of connecting hardware and method to solve the problems of low efficiency, poor accuracy and high construction risk in the traditional overhead line method for adjusting conductor sag. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of small adjustment range and poor adjustment accuracy of traditional adjustment fittings.

[0006] This invention is achieved by the following technical solution: This invention provides an adjustable wire length connection hardware, including a turnbuckle, a PT adjustment plate and / or a DB adjustment plate; The PT adjustment plate is elongated and has multiple adjustment holes evenly distributed on it; The DB adjustment plate is fan-shaped, with multiple adjustment holes evenly distributed along its arc edge; The turnbuckle has a bidirectional rotating threaded adjustment mechanism; The PT adjustment plate, DB adjustment plate, and turnbuckle are connected to one or both ends of the insulation string in any of the following combinations to adjust the wire length: The first assembly includes a PT adjustment plate and a turnbuckle. The second assembly includes the DB adjustment plate and turnbuckle; The third assembly includes: PT adjustment plate, DB adjustment plate, and turnbuckle.

[0007] Furthermore, the turnbuckle includes: The main body is in the shape of a long rod, with threaded holes with opposite directions machined at both ends; The first screw engages with a threaded hole at one end of the body; The second screw engages with the threaded hole at the other end of the body; A first locking nut is disposed on the first screw; The second locking nut is disposed on the second screw.

[0008] Furthermore, it also includes: an adjustment tool for use with the turnbuckle, the adjustment tool including an anti-rotation rod and a wrench.

[0009] Furthermore, the first screw has double lugs, the second screw has a single lug, and the two ends of the body are provided with hexagonal structures for inserting a wrench; the neck of the double lugs is provided with threaded holes for installing an anti-spinning rod.

[0010] Based on the same inventive concept, the present invention also provides a tension string, including an insulator string and an adjustable line length connecting fitting connected in series with the insulator string.

[0011] Furthermore, the insulator string consists of two parallel strings, which are laterally connected by a connecting plate.

[0012] Furthermore, one end of the insulator string is connected in series with a first DB adjustment plate and a first PT adjustment plate, and the other end of the insulator string is connected in series with a turnbuckle nut and a second DB adjustment plate.

[0013] Based on the same inventive concept, the present invention also provides a rapid wire tightening method based on the adjustable wire length connecting fitting, comprising the following steps: The tension string containing the adjustable wire length connecting hardware is assembled, and the adjustable wire length connecting hardware is preset to the initial length; The conductor and the tension string are suspended from the tension tower; Measure the sag of the conductor at the construction site and calculate the required conductor length compensation ΔL; Based on the line length compensation amount ΔL, the connection hole positions of the PT adjustment plate and / or DB adjustment plate are changed to achieve stepped coarse adjustment; the line length is then finely adjusted steplessly using turnbuckles. Check the conductor sag, and tighten the wire after confirming that it is correct.

[0014] Furthermore, the correspondence between the line length compensation amount ΔL and the adjustment of the PT adjustment plate and / or the DB adjustment plate is as follows: When -600≤ΔL≤-500mm, adjust the hole combination of the PT adjustment plate and the DB adjustment plate; When -500 < ΔL ≤ -100mm, adjust the hole combination of the PT adjustment plate or DB adjustment plate; When 100≤ΔL≤500mm, adjust the hole combination of the PT adjustment plate or DB adjustment plate; When 500 < ΔL ≤ 600 mm, adjust the hole combination of the PT adjustment plate and the DB adjustment plate. The adjustment hardware achieves a total adjustment capacity from -600 mm to +600 mm, which can meet most sag adjustment needs and avoid construction rework caused by insufficient hardware adjustment capacity.

[0015] Furthermore, the stepless fine-tuning of the turnbuckle specifically includes: Loosen the first and second locking nuts; Install the anti-heel rotation rod into the threaded hole at the neck of the double lugs; The wrench is installed on the hexagonal structure of the single-hook ear neck. Clockwise rotation shortens the length, while counterclockwise rotation lengthens it. The anti-rotation rod is kept fixed during rotation. After adjusting to the target length, remove the wrench and anti-rotation rod, and tighten the lock nut.

[0016] Furthermore, when adjusting the hole positions of the PT adjustment plate or DB adjustment plate, a wire tensioner must first be used to temporarily fix and release the tension at both ends of the adjustable wire length connecting hardware system. After the hole positions are adjusted and tightened, the wire tensioner can be removed.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides an adjustable line length connecting hardware, comprising: a PT adjusting plate, which is elongated and has multiple evenly distributed adjusting holes; a DB adjusting plate, which is fan-shaped and has multiple evenly distributed adjusting holes along its arc-shaped edge; and a turnbuckle with a bidirectional rotating threaded adjusting mechanism. The PT adjusting plate, DB adjusting plate, and turnbuckle are connected in any of the following ways to constitute the hardware: a first combination includes the PT adjusting plate and the turnbuckle; a second combination includes the DB adjusting plate and the turnbuckle; and a third combination includes the PT adjusting plate, DB adjusting plate, and turnbuckle. The hardware significantly improves the overall adjustment range through the series connection of multiple adjusting hardware components. The addition of the turnbuckle nut enables stepless adjustment of the connecting hardware, meeting most sag adjustment needs and avoiding rework caused by insufficient hardware adjustment capacity. This systematic solution standardizes and toolizes multiple adjustment methods, providing comprehensive hardware support for rapid line tightening construction.

[0018] This invention proposes a rapid wire tensioning method, employing a complete process of ground pre-assembly followed by aerial coarse and fine adjustments, thereby optimizing the construction process and doubling operational efficiency. By breaking down the complex length adjustment operation into clear steps and specifying the corresponding tools and operating standards for each step, this method significantly reduces wire tensioning time, greatly shortens the stringing construction time, significantly reduces power outage time when crossing transmission lines and interference with railway and highway operations, and improves construction safety and economy. Attached Figure Description

[0019] Figure 1 This is a three-dimensional diagram of the tension string in Embodiment 2 of the present invention.

[0020] Figure 2 This is a three-dimensional view of the turnbuckle of the present invention.

[0021] Figure 3 This is a schematic diagram of the hole positions on the DB adjustment plate.

[0022] Figure 4 This is a schematic diagram of the hole positions on the PT adjustment plate.

[0023] Figure 5 Flowchart for adjusting the length of turnbuckles.

[0024] Figure 6 This is a schematic diagram of the tension string structure in Embodiment 4 of the present invention.

[0025] Figure 7 for Figure 6 Enlarged view of a portion of position A in the middle.

[0026] Figure 8 for Figure 6 Enlarged view of part B in the middle.

[0027] Among them, 1. PT adjusting plate; 101. Single plate end of PT adjusting plate; 102. Double plate end of PT adjusting plate; 2-1. First DB adjusting plate; 2-2. Second DB adjusting plate; 3. Turnbuckle; 11. Hole A; 12. Hole B; 13. Hole C; 14. Hole D; 15. Hole E; 16. Hole F; 17. PT fixing hole; 21. Hole 1; 22. Hole 2; 23. Hole 3; 24. Hole 4; 25. Hole 5; 31. Body; 32. First screw; 33. Second screw; 34-1. First locking nut; 34-2. Second locking nut; 35. Hexagonal structure; 4. Anti-rotation rod; 5. Wrench; 6. Insulator string; 7. Connecting plate; 1-1. First PT adjusting plate; 1-2. Second PT adjusting plate; 3a. Self-locking turnbuckle; 301. Long hole; 302. First cotter pin; 303. Second cotter pin; 304. Limiting pin. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other instances that are improved or modified by those skilled in the art are within the scope of protection of the present invention. It should be understood that the embodiments of the present invention are only used to illustrate the technical effects of the present invention, and are not intended to limit the scope of protection of the present invention. Unless otherwise specified, the methods used in the embodiments are conventional methods.

[0029] Existing conductor hardware has a limited range of adjustable conductor length at the suspension points. When the conductor sag cannot meet requirements, the hardware cannot adjust the conductor sag. This invention proposes a rapid tensioning method based on novel adjustable conductor length connection hardware. Through research on existing 220kV tension string types, using the total design length adjustment of the tension hardware string as the overall design parameter, an optimal allocation algorithm for conductor length compensation is developed. The compensation amount for structural components with conductor length adjustment function is allocated. Combining the structural component dimensions and conductor length compensation amount, the suspension point position, size, direction, and assembly applicability are designed to form an overall design scheme for a tension string with conductor length adjustment function. With the aid of matching tools, the conductor length can be quickly and accurately adjusted, ensuring that the conductor sag quickly and accurately meets design requirements. This method has high theoretical and engineering application value and broad application prospects in the construction of three-span lines, especially those crossing transmission lines. It can be used as a reference for construction companies in the industry, shortening the construction time of three-span lines, especially those crossing transmission lines, and improving the safety of line construction.

[0030] Example 1 This embodiment provides an adjustable wire length connection hardware, including a turnbuckle, a PT adjustment plate and / or a DB adjustment plate; The PT adjustment plate is elongated and has multiple adjustment holes evenly distributed on it; The DB adjustment plate is fan-shaped, with multiple adjustment holes evenly distributed along its arc edge; The turnbuckle has a bidirectional rotating threaded adjustment mechanism; The PT adjustment plate, DB adjustment plate, and turnbuckle are connected to one or both ends of the insulation string in any of the following combinations to adjust the wire length: The first assembly includes a PT adjustment plate and a turnbuckle. The second assembly includes the DB adjustment plate and turnbuckle; The third assembly includes: PT adjustment plate, DB adjustment plate, and turnbuckle.

[0031] Example 2 Based on the same inventive concept, the present invention also provides a tension string, an insulator string, and an adjustable wire length connecting fitting as described in Embodiment 1, which is connected in series with the insulator string.

[0032] Furthermore, the insulator string consists of two parallel strings, which are laterally connected by a connecting plate.

[0033] Furthermore, one end of the insulator string is connected in series with a first DB adjustment plate and a first PT adjustment plate, and the other end of the insulator string is connected in series with a turnbuckle nut and a second DB adjustment plate.

[0034] like Figure 1 As shown, this embodiment provides a tension string, including: two parallel insulator strings 6 connected by a connecting plate 7; a PT adjusting plate 1 and a first DB adjusting plate 2-1 sequentially connected to one end of the insulator strings 6; and a turnbuckle 3 and a second DB adjusting plate 2-2 sequentially connected to the other end of the insulator strings 6. The two insulator strings 6 are connected by the connecting plate 7. The single-lug side of the turnbuckle 3 is connected to the insulator string 6 via the connecting plate 7, and the double-lug side is connected to the second DB adjusting plate 2-2.

[0035] like Figure 2 As shown, the turnbuckle 3 includes: The body 31 has threaded holes with opposite directions machined at both ends inside; The first screw 32 engages with a threaded hole at one end of the body 31; The second screw 33 engages with the threaded hole at the other end of the body 31; The first locking nut 34-1 is disposed on the first screw 32; The second locking nut 34-2, located on the second screw 33, is used to lock and fix the screw after adjustment.

[0036] The connecting hardware also includes an adjusting tool for use with the turnbuckle 3. The adjusting tool includes an anti-rotation lever 4 and a wrench 5, which is a ratchet wrench or an electric wrench. The turnbuckle 3 has a double lug on one side and a single lug on the other side. Both ends of the body are provided with hexagonal structures 35 for inserting the wrench 5. The neck of the double lug is provided with a threaded hole for installing the anti-rotation lever 4.

[0037] like Figure 3 As shown, the first DB adjustment plate 2-1 and the second DB adjustment plate 2-2 have the same structure, both being oblique fan-shaped, and can be collectively referred to as DB adjustment plates. Multiple adjustment holes, such as one hole 21, two holes 22, three holes 23, four holes 24, and five holes 25, are evenly distributed along the arc-shaped edge of the DB adjustment plate. The wire length can be changed by fixing the connecting hardware to different holes.

[0038] The PT adjustment plate 1 includes three elongated perforated plates. Two of the perforated plates (referred to as the double-plate end) are arranged in parallel, with one end clamping one end of the other perforated plate (referred to as the single-plate end). The three perforated plates are fixed together as a single hardware structure by fixing bolts. Each perforated plate has seven holes. The outermost hole serves as a fixing hole, connecting to the external hardware at one end. The other six holes serve as adjustment holes, allowing for adjustable connections to the external hardware at the other end. By changing the position of the holes through which the fixing bolts pass on the double-plate end or the single-plate end, or by simultaneously changing the positions of the holes through both the double-plate end and the single-plate end, different line length adjustments can be achieved. Figure 4 As shown, the PT adjustment plate has multiple adjustment holes, such as PT fixing hole 17, hole position A 11, hole position B 12, hole position C 13, hole position D 14, hole position E 15, and hole position F 16. The wire length can be changed by fixing the connecting hardware to different holes.

[0039] like Figure 5 The diagram shows the method for adjusting the length of the turnbuckle 3. The wrench 5 is a ratchet wrench, and the operation steps (a) to (f) are as follows: a) Loosen the first locking nut 34-1 and the second locking nut 34-2 at both ends of the turnbuckle 3; b) Install the anti-heel swing rod 4 on the double-hook side; c) Insert the ratchet wrench into the neck of the single-hook ear; d) Move the ratchet wrench along the axial direction into the hexagonal structure on the middle body 31; rotate the ratchet wrench clockwise to shorten it, and counterclockwise to extend it; keep the anti-rotation rod 4 fixed during rotation. e) After adjusting to the appropriate length, move the ratchet wrench 5 axially to the neck of the single lug side, adjust the ratchet opening to coincide with the opening of the middle body, and remove the ratchet wrench 5. f) Remove the anti-rotation rod 4 and tighten the first locking nut 34-1 and the second locking nut 34-2.

[0040] Example 3 Based on the same inventive concept, this embodiment provides a rapid wire tightening method based on the adjustable wire length connecting fitting, including the following steps: S10. Before suspension, assemble the tension string that is adapted to the adjustment of the conductor length on the ground, confirm the connection position and status of each connecting hardware, and ensure that the turnbuckle is adjusted to the shortest length before going online. The double plate end and single plate end of the PT adjustment plate are both connected to the hole D position, and the DB adjustment plate is connected to the middle third hole position.

[0041] S20. Based on existing tensioning methods, carry out conductor tension string suspension construction. Determine the tensioning tower based on the rotation angle of the tension section, and then carry out tensioning construction on the tensioning tower.

[0042] S21. Tension tower stringing: The conductor has been hung on the non-tensioned side of the conductor crossarm or a balance guy wire has been installed. The conductor tension pipe is crimped on the ground, and after the conductor is raised into the air, it is connected in series with the tension tower.

[0043] S22. Balance the conductor by hanging wires on intermediate non-tensioned towers. Except for those that do not require tensioning, the remaining operations are the same as the tensioning operations for intermediate tensioned towers.

[0044] S23. For tension towers with straight-through conductor laying, temporary anchoring with rubber-coated steel strand is carried out on one side of the tower (either the larger or smaller side), while two sets of 5t pulley blocks are used for tensioning on the tensioning side. Alternatively, two sets of tensioning pulley blocks can be symmetrically arranged on both the front and rear sides of the crossarm.

[0045] S24, tension string suspension 1) First, assemble the porcelain bottle hardware string on the ground, and use a pulley block to hoist the porcelain bottle hardware string while adjusting the mouth of the porcelain bottle.

[0046] 2) Connect tensioning pulley blocks to the tension string fittings L-connector plate (or sub-conductor adjustment plate) respectively.

[0047] 3) Position the tension string at the crossarm hanging point and anchor the pulley block tensioner on the conductor at a distance of L1 (insulator string length + tensioner remaining length + 8m) from the crossarm on the tensioning side.

[0048] S25, Opening and lowering of the pulley 1) Tightening the wires involves simultaneously tightening two sub-conductors of the same phase to achieve symmetrical tightening of the sub-conductors.

[0049] 2) After the sub-conductor is relaxed, the conductor is cut. Before cutting the conductor at height, use white hemp rope to tie the conductors on both sides of the cut point to the crossarm. The operator should stand on the outer corner and the safety rope should be tied to the crossarm.

[0050] Before cutting the last sub-conductor, the laying pulley should be turned to the ground by a φ18 white hemp rope on a 3T pulley on the crossarm to prevent the pulley from shaking after the line is cut.

[0051] S30, Tightening thread By employing a rapid on-site conductor sag measurement technique, the conductor length compensation amount can be quickly calculated. Based on this compensation amount, the connecting hardware can be adjusted accordingly. The adjustment method is as follows: S31. Adjust the length of the PT adjustment plate, DB adjustment plate, turnbuckle and other connecting hardware according to the conductor length compensation amount. The specific operation steps are shown in Table 1.

[0052] Table 1. Procedure for adjusting the length of connecting hardware

[0053] S32, PT adjustment plate, and DB adjustment plate length adjustment methods: 1) Connect one end of the tensioner to the traction plate and fix the other end to the main body of the transmission tower or crossarm. Tighten the tensioner to release the tension at both ends of the connecting hardware.

[0054] 2) Loosen the bolts at the bolt holes of the PT adjustment plate and DB adjustment plate, move the adjustment plate to the target hole position, align it, insert the bolts and tighten them again.

[0055] 3) Loosen and remove the tensioner, and complete the length adjustment of the PT adjustment plate and DB adjustment plate.

[0056] S33. Method for adjusting the length of turnbuckles Perform the operation as shown in the figure: a) Loosen the lock nut of the turnbuckle; b) Install the anti-spin bar on the double-hook side; c) Insert the ratchet wrench into the neck of the single hook; d) Move the ratchet wrench axially into the body; rotating the ratchet wrench clockwise shortens it and counterclockwise extends it; keep the anti-rotation lever fixed during rotation. e) After adjusting to the appropriate length, move the ratchet wrench axially to the neck of the single lug, adjust the ratchet opening to coincide with the body opening, and remove the ratchet wrench; f) Remove the anti-rotation rod and tighten the lock nut.

[0057] S40. After adjusting the connecting hardware according to the conductor length compensation, check the sag. If there is no error, remove the length adjustment tools.

[0058] The present invention has the following beneficial effects: In conventional overhead line construction, when the sag value fails to meet design requirements after the conductor is laid out, conductor sag adjustment is necessary. During construction, the sag value is often adjusted and observed simultaneously until it meets the set requirements. However, it is impossible to accurately adjust the conductor length compensation to the sag value that meets the design requirements in one go during the sag adjustment process. The lack of hardware with accurate fine-tuning function for conductor length results in long adjustment time. When the conductor sag fails to meet design requirements, it may even lead to rework of the overhead line construction, further increasing the workload and risks of the overhead line construction. The proposed method for rapid wire tightening based on a novel adjustable wire length connector offers several advantages. First, it enables a wide range of wire length adjustment, up to 1200mm, meeting the wire length compensation requirements for most sag adjustments and reducing rework. Second, it allows for stepless adjustment of the wire length through the structural design of the novel adjustable wire length connector, overcoming the limitations of traditional methods that only allow for incremental and interval-based length adjustments. Third, it enables rapid adjustment of the wire length, ensuring that the wire sag quickly and accurately meets design requirements, reducing the time required for wire tightening.

[0059] Example 4 Based on the same inventive concept, this embodiment provides another tension string, an insulator string, and an adjustable wire length connecting fitting as described in Embodiment 1, connected in series with the insulator string.

[0060] Furthermore, the insulator string consists of two parallel strings, which are laterally connected by a connecting plate.

[0061] Furthermore, one end of the insulator string is connected in series with a first DB adjustment plate, a first PT adjustment plate, and a second PT adjustment plate, and the other end of the insulator string is connected in series with a turnbuckle nut and a second DB adjustment plate.

[0062] like Figure 6 As shown, this embodiment provides a tension string, including: two parallel insulator strings 6 connected by a connecting plate 7; a first DB adjustment plate 2-1, a first PT adjustment plate 1-1, and a second PT adjustment plate 1-2 connected in series to one end of each insulator string 6; and a self-locking turnbuckle 3a and a second DB adjustment plate 2-2 connected in series to the other end of each insulator string 6. The two insulator strings 6 are connected by the connecting plate 7. The single-lug side of the self-locking turnbuckle 3a is connected to the insulator string 6 via the connecting plate 7, and the double-lug side is connected to the second DB adjustment plate 2-2.

[0063] like Figure 7As shown, the first PT adjustment plate 1-1 and adjustment plate 1-2 have the same structure and are connected end to end. Each PT adjustment plate includes three elongated perforated plates. Two of the perforated plates (referred to as the PT adjustment plate double plate end 102) are arranged in parallel, with one end clamping one end of another perforated plate (referred to as the PT adjustment plate single plate end 101). The three perforated plates are fixed together as a single hardware structure by through-hole fixing bolts. Each perforated plate has 7 holes. The outermost hole serves as a fixing hole for connection with external hardware at one end, and the other 6 holes serve as adjustment holes for adjustable connection with external hardware at the other end. By changing the hole positions on the double plate end or single plate end through which the fixing bolts pass, or by simultaneously changing the hole positions on both the PT adjustment plate double plate end 102 and the PT adjustment plate single plate end 101 through which the fixing bolts pass, different line length adjustments can be achieved. In this embodiment, a wider adjustment range can be achieved by using two PT adjustment plates, the first PT adjustment plate 1-1 and the second PT adjustment plate 1-2.

[0064] like Figure 8 As shown, the self-locking turnbuckle 3a has elongated holes 301 on both sides of its body; the tail of the first screw has a pin hole and is locked by inserting a first cotter pin 302; the tail of the second screw has a pin hole and is locked by inserting a second cotter pin 303. A limiting pin 304 is also inserted through the middle of the body of the self-locking turnbuckle 3a to limit the maximum screwing depth of the screws at both ends.

[0065] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An adjustable wire length connecting fitting, characterized in that, Includes turnbuckles, PT adjustment plates, and / or DB adjustment plates; The PT adjustment plate is elongated and has multiple adjustment holes evenly distributed on it; The DB adjustment plate is shaped like a slanted fan, with multiple adjustment holes evenly distributed along its arc edge; The turnbuckle has a bidirectional rotating threaded adjustment mechanism; The PT adjustment plate, DB adjustment plate, and turnbuckle are connected to one or both ends of the insulation string in any of the following combinations to adjust the wire length: The first assembly includes a PT adjustment plate and a turnbuckle. The second assembly includes the DB adjustment plate and turnbuckle; The third assembly includes the PT adjustment plate, the DB adjustment plate, and the turnbuckle.

2. The adjustable wire length connecting fitting according to claim 1, characterized in that, The turnbuckle includes: The main body is in the shape of a long rod, with threaded holes with opposite directions machined at both ends; The first screw engages with a threaded hole at one end of the body; The second screw engages with the threaded hole at the other end of the body; A first locking nut is disposed on the first screw; The second locking nut is disposed on the second screw.

3. The adjustable wire length connecting fitting according to claim 1, characterized in that, Also includes: An adjusting tool used in conjunction with the turnbuckle includes an anti-rotation rod and a wrench.

4. The adjustable wire length connecting fitting according to claim 3, characterized in that, The first screw has two lugs, and the second screw has a single lug; The two ends of the body are provided with hexagonal structures for inserting wrenches; The neck of the double lugs is provided with threaded holes for installing anti-heel rotation rods.

5. A tension string, characterized in that, include: The insulator string and the adjustable wire length connecting fitting connected in series with the insulator string as described in any one of claims 1 to 4.

6. The tension string according to claim 5, characterized in that, The insulator string consists of two parallel insulator strings, which are laterally connected by a connecting plate.

7. The tension string according to claim 5, characterized in that, One end of the insulator string is connected in series with a first DB adjustment plate and a first PT adjustment plate, and the other end of the insulator string is connected in series with a turnbuckle nut and a second DB adjustment plate.

8. A rapid tensioning method for adjusting the tension string as described in any one of claims 5-7, characterized in that, Includes the following steps: The tension string containing the adjustable wire length connecting hardware is assembled, and the adjustable wire length connecting hardware is preset to the initial length; The conductor and the tension string are suspended from the tension tower; Measure the sag of the conductor at the construction site and calculate the required conductor length compensation ΔL; Based on the line length compensation amount ΔL, stepwise coarse adjustment is achieved by changing the connection hole positions of the PT adjustment plate and / or DB adjustment plate; stepless fine adjustment of the conductor length is achieved by using turnbuckles. Check the conductor sag and tighten the wire after confirming that it is correct.

9. The rapid tensioning method according to claim 7, characterized in that, The relationship between the line length compensation amount ΔL and the adjustment of the PT adjustment plate and / or DB adjustment plate is as follows: When -600≤ΔL≤-500mm, adjust the hole combination of the PT adjustment plate and the DB adjustment plate; When -500 < ΔL ≤ -100 mm, adjust the hole combination of the PT adjustment plate or DB adjustment plate; When 100≤ΔL≤500mm, adjust the hole combination of the PT adjustment plate or DB adjustment plate; When 500 < ΔL ≤ 600 mm, adjust the hole combination of the PT adjustment plate and the DB adjustment plate.

10. The rapid tensioning method according to claim 7, characterized in that, When adjusting the hole positions of the PT adjustment plate or DB adjustment plate, a wire tensioner must first be used to temporarily fix and release the tension at both ends of the adjustable wire length connecting hardware. After the hole positions are adjusted and tightened, the wire tensioner can be removed.

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