A power distribution pole tower anti-frost heaving spiral anchor suitable for cold frozen soil area

Abstract

The application discloses a power distribution pole tower anti-frost heaving spiral anchor suitable for cold frozen soil areas and belongs to the technical field of power distribution pole tower foundation anchoring, and solves the problems that the existing spiral anchor in frozen soil areas is prone to overall pulling out and the sleeve cannot reset automatically. The spiral anchor comprises an anchor rod, a threaded section and a fastening connecting disc are arranged at the upper end of the anchor rod, an anchoring section and a first anchor disc are arranged at the bottom of the anchor rod; a first sleeve provided with a second anchor disc and a second sleeve provided with a third anchor disc are arranged outside the anchor rod, and the two sleeves are in sliding cooperation with the anchor rod; a threaded sleeve is threadedly connected to the threaded section, an adjusting sleeve is rotationally connected below the threaded sleeve, and the adjusting sleeve and the first sleeve and the first sleeve and the second sleeve are in one-way ratchet cooperation, so that synchronous rotation or independent sliding states can be switched; a magnetic displacement sensor is arranged in the anchor rod to monitor the displacement of the sleeve. The sleeve can be quickly reset after frost heaving and pulling out, has strong anti-frost heaving durability, can cooperatively improve the bearing capacity through multiple anchor discs, and is suitable for the long-term stable anchoring demand of power distribution pole towers in cold frozen soil areas.

Description

Technical Field

[0001] This invention relates to the field of anchoring technology for power distribution tower foundations, and in particular to an anti-frost helical anchor suitable for power distribution towers in cold and frozen soil regions. Background Technology

[0002] Spiral anchors are widely used for anchoring power distribution tower foundations due to their convenient construction and high bearing capacity. However, in cold and frozen soil regions, the periodic frost heave and thaw settlement of the soil can generate huge frost pull-out forces.

[0003] Traditional helical anchors are pulled upwards by frost heave forces, causing towers to tilt or even collapse. Existing improved frost heave anchors use a sleeve around the anchor rod to direct the frost pull force to the sleeve instead of the anchor rod. However, during soil thawing and settlement, the sleeve, due to friction with the anchor rod, cannot settle and return to its original position. After multiple rounds of frost heave and thawing, the sleeve is gradually pulled upwards until it loses its protective space, ultimately losing its frost heave resistance. Furthermore, to avoid the effects of frost heave, the anchor plate of traditional frost heave anchors can only be placed below the maximum frost depth line, often employing a single anchor plate structure. This results in significantly insufficient vertical load-bearing capacity, making it difficult to meet the anchoring requirements of high-load power distribution towers. Summary of the Invention

[0004] The technical problem to be solved by this invention is that existing spiral anchors in frozen soil areas have poor frost heave resistance and durability, the sleeve cannot actively reset, and the bearing capacity is low. To address this, we propose a frost heave anchor suitable for power distribution towers in cold frozen soil areas.

[0005] To achieve the above objectives, this application adopts the following technical solution: A frost-resistant spiral anchor for power distribution towers in cold and frozen soil areas includes: an anchor rod, a threaded section fixedly connected to the upper end of the anchor rod by welding, a fastening connection plate for connecting to the superstructure fixedly connected to the top of the threaded section by welding, an anchoring section fixedly connected to the bottom of the anchor rod by welding, and a first anchor plate sleeved on and fixedly connected to the anchoring section by welding. The anchor bolt outer sleeve is provided with a first sleeve and a second sleeve. The first sleeve is slidably fitted with the anchor bolt. A second anchor plate is provided on the first sleeve and fixedly connected by welding. The second sleeve is slidably fitted with the anchor bolt. A third anchor plate is provided on the second sleeve and fixedly connected by welding. A threaded sleeve is threadedly connected to the outer sleeve of the threaded section. An adjusting sleeve is rotatably connected below the threaded sleeve. A first one-way ratchet is machined at the lower end of the adjusting sleeve. A second one-way ratchet that engages with the first one-way ratchet is machined at the upper end of the first sleeve. A third one-way ratchet is machined at the lower end of the first sleeve. A fourth one-way ratchet that engages with the third one-way ratchet is machined at the upper end of the second sleeve. When the threaded sleeve is screwed down along the threaded section, it drives the adjusting sleeve to descend synchronously, so that the first one-way ratchet tooth and the second one-way ratchet tooth are tightly engaged, and the third one-way ratchet tooth and the fourth one-way ratchet tooth are tightly engaged, thereby making the adjusting sleeve, the first sleeve and the second sleeve and the anchor rod form a synchronously rotating whole. When the threaded sleeve is screwed back up along the threaded section, it drives the adjusting sleeve to rise synchronously, causing the first one-way ratchet to separate from the second one-way ratchet, thereby allowing the first sleeve and the second sleeve to slide up and down independently relative to the anchor rod.

[0006] Furthermore, the bottom of the threaded sleeve is provided with an annular groove, and the upper end of the adjusting sleeve is fixedly connected to a rotating disk by welding. The rotating disk is embedded in the annular groove. The bottom of the threaded sleeve is also provided with a flange, which is fixedly connected to the threaded sleeve by bolts. The flange and the threaded sleeve clamp the rotating disk in the middle, realizing the rotational connection between the adjusting sleeve and the threaded sleeve.

[0007] Furthermore, a first lever sleeve is welded to the outer wall of the threaded sleeve. The first lever sleeve is a hollow tubular structure used to insert a lever to manually rotate the threaded sleeve. An adjusting nut is also fixedly connected to the outer wall of the threaded sleeve by welding. The adjusting nut is a hexagonal nut structure used to cooperate with a hydraulic wrench to electrically rotate the threaded sleeve.

[0008] Furthermore, a second lever sleeve is welded to the outer wall of the adjusting sleeve. The second lever sleeve is a hollow tubular structure used to insert a lever to manually rotate the adjusting sleeve. A sleeve reset nut is also fixedly connected to the outer wall of the adjusting sleeve by welding. The sleeve reset nut is a hexagonal nut structure used to cooperate with a hydraulic wrench to electrically rotate the adjusting sleeve.

[0009] Furthermore, the first, second, and third anchor plates are all continuous spiral structures, and the spiral helix angles and spiral directions of the first, second, and third anchor plates are the same.

[0010] Furthermore, the upper and lower inner walls of the first sleeve, the upper and lower inner walls of the second sleeve, and the lower inner wall of the adjusting sleeve are all provided with annular sealing grooves. Rubber sealing rings are installed in the annular sealing grooves, and the sealing rings are interference-fitted with the outer wall of the anchor rod.

[0011] Furthermore, the anchor bolt is a hollow tubular structure, and a magnetostrictive displacement sensor is fixedly installed in the internal cavity of the anchor bolt. The sensing end of the magnetostrictive displacement sensor is aligned with the upper end face of the first sleeve and the upper end face of the second sleeve, respectively.

[0012] Furthermore, the lower end of the anchoring section is machined with a conical tip, the cone angle of which is 30°-45°.

[0013] Furthermore, the inner ring of the first anchor plate is fixedly connected to the outer wall of the anchoring section by double-sided fillet welds, the inner ring of the second anchor plate is fixedly connected to the outer wall of the first sleeve by double-sided fillet welds, and the inner ring of the third anchor plate is fixedly connected to the outer wall of the second sleeve by double-sided fillet welds.

[0014] Furthermore, the first, second, third, and fourth unidirectional ratchet teeth are all sawtooth-shaped unidirectional ratchet teeth with a tooth surface inclination angle of 45°-60°, and the tooth direction is consistent with the screwing direction of the helical anchor.

[0015] The technical effects and advantages of this invention are as follows: 1. This solution designs a sleeve reset mechanism based on a one-way ratchet. The connection state between the sleeve and the anchor rod can be switched by raising and lowering the threaded sleeve. After being pulled up due to frost heave, the sleeve can be quickly reset by simple rotation. This solves the problem of failure of traditional sleeve-type anti-frost heave spiral anchors after multiple freeze-thaw cycles and greatly improves the durability against frost heave.

[0016] 2. This scheme adopts a multi-anchor plate cooperative bearing structure. The first anchor plate is set below the maximum frost depth line to provide basic anchoring force. The second and third anchor plates participate in bearing during the non-frost heave period. During the frost heave period, they move independently upward with the sleeve without moving the anchor rod. This scheme takes into account both frost heave resistance and bearing capacity, and the anchoring strength is increased by more than 60% compared with the single anchor plate structure. Attached Figure Description

[0017] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a front view structural diagram of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the anchor bolt structure of the present invention; Figure 5 This is a schematic diagram of the first and second sleeve structures of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B; Figure 7 For the present invention Figure 5 Enlarged structural diagram at point C; Figure 8 For the present invention Figure 5 Enlarged structural diagram at point D.

[0018] Legend: 1. Anchor bolt; 2. Threaded section; 3. Fastening connecting plate; 4. Anchoring section; 5. First anchor plate; 6. First sleeve; 7. Second anchor plate; 8. Second sleeve; 9. Third anchor plate; 10. Threaded sleeve; 11. First lever sleeve; 12. Adjusting nut; 13. Adjusting sleeve; 14. Rotary disc; 15. Flange; 16. Second lever sleeve; 17. Sleeve return nut; 18. First one-way ratchet; 19. Second one-way ratchet; 20. Third one-way ratchet; 21. Fourth one-way ratchet. Detailed Implementation

[0019] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] Example 1: Refer to Figures 1 to 8 This embodiment provides a foundation structure for a frost-resistant spiral anchor for power distribution towers in cold, frozen soil regions, as follows: Anchor rod 1 is made of seamless steel pipe with a diameter of 114mm and a wall thickness of 8mm. A 300mm long threaded section 2 is welded to the upper end. A 300mm diameter, 20mm thick fastening connecting plate 3 is welded to the top of the threaded section 2 for connection to the power distribution tower foundation flange. An anchoring section 4 with a length of 400mm is welded to the bottom of anchor rod 1. The lower end of anchoring section 4 is machined with a conical tip with a cone angle of 35° to facilitate the spiral anchor being screwed into the ground. A first anchor plate 5 is fitted onto the outer wall of anchoring section 4 and fixed by double-sided fillet welds. The first anchor plate 5 has a continuous spiral structure with a spiral helix angle of 15° and an outer diameter of 350mm.

[0021] Anchor bolt 1 is fitted with a first sleeve 6 and a second sleeve 8. The first sleeve 6 is made of seamless steel pipe with a diameter of 140 mm and a wall thickness of 6 mm, and is 800 mm long. A second anchor plate 7 is welded to its outer wall. The second sleeve 8 is made of seamless steel pipe with a diameter of 168 mm and a wall thickness of 6 mm, and is 800 mm long. A third anchor plate 9 is welded to its outer wall. The helix angle and helix direction of the second anchor plate 7 and the third anchor plate 9 are exactly the same as those of the first anchor plate 5, and both have an outer diameter of 400 mm. The first sleeve 6 and the second sleeve 8 are clearance fits with anchor bolt 1 and can slide freely along the axial direction of anchor bolt 1.

[0022] A threaded sleeve 10 is threadedly connected to the threaded section 2. The inner wall of the threaded sleeve 10 is machined with an external thread that matches the threaded section 2. A 30mm deep annular groove is formed at the bottom of the threaded sleeve 10. A rotating disk 14 with a diameter matching the annular groove is welded to the upper end of the adjusting sleeve 13, and the rotating disk 14 is embedded in the annular groove. A flange 15 is also fixedly connected to the bottom of the threaded sleeve 10 by six sets of M12 bolts. The flange 15 and the threaded sleeve 10 clamp the rotating disk 14 in the middle, achieving a rotatable connection between the adjusting sleeve 13 and the threaded sleeve 10. That is, the threaded sleeve 10 can drive the adjusting sleeve 13 to rise and fall synchronously, and the adjusting sleeve 13 can rotate freely relative to the threaded sleeve 10.

[0023] The lower end of the adjusting sleeve 13 is machined with a first one-way ratchet 18, and the upper end of the first sleeve 6 is machined with a second one-way ratchet 19 that engages with it; the lower end of the first sleeve 6 is machined with a third one-way ratchet 20, and the upper end of the second sleeve 8 is machined with a fourth one-way ratchet 21 that engages with it. All four one-way ratchets have a sawtooth structure with a tooth surface inclination angle of 50°, and the tooth direction is consistent with the screw-in direction of the helical anchor, ensuring that only the torque in the screw-in direction can be transmitted after engagement.

[0024] Two first lever sleeves 11, with an inner diameter of 25mm, are symmetrically welded to the outer wall of the threaded sleeve 10. These are used to manually rotate the threaded sleeve 10 by inserting a steel rod. A hexagonal adjusting nut 12 is also welded on the outer wall, which can be used with a hydraulic wrench to achieve electric rotation. Two second lever sleeves 16, also with an inner diameter of 25mm, are symmetrically welded to the outer wall of the adjusting sleeve 13. A hexagonal sleeve reset nut 17 is also welded on the outer wall.

[0025] Anchor 1 has a hollow structure, with two magnetostrictive displacement sensors fixedly installed in the internal cavity. The sensing ends are respectively aligned with the upper end face of the first sleeve 6 and the upper end face of the second sleeve 8. The measurement accuracy is 0.5mm and the range is 200mm, which can monitor the upward displacement of the two sleeves in real time.

[0026] The working principle of this embodiment is as follows: During construction, the steel rod is first inserted into the first lever sleeve 11 and the threaded sleeve 10 is rotated, or a hydraulic wrench is used in conjunction with the adjusting nut 12 to rotate the threaded sleeve 10, causing the adjusting sleeve 13 to move downward, so that the first one-way ratchet 18 and the second one-way ratchet 19, the third one-way ratchet 20 and the fourth one-way ratchet 21 are tightly engaged, and at the same time, the lower end of the second sleeve 8 abuts against the anchoring section 4. At this time, the adjusting sleeve 13, the first sleeve 6, the second sleeve 8 and the anchor rod 1 form a synchronously rotating whole. Then, the rotary drilling rig is used to drive the fastening connecting plate 3 to rotate, driving the entire spiral anchor into the ground to a predetermined depth, ensuring that the first anchor plate 5 is below the local maximum frost depth line, and the threaded sleeve 10 protrudes 500mm above the ground.

[0027] After screwing in, rotate the threaded sleeve 10 in the opposite direction to make it rotate upwards and push the adjusting sleeve 13 up by 50mm, so that the first one-way ratchet 18 and the second one-way ratchet 19 are separated. At this time, the first sleeve 6 and the second sleeve 8 can slide up and down independently relative to the anchor rod 1, and a 50mm frost heave reserved gap is formed between the bottom of the adjusting sleeve 13 and the top of the first sleeve 6.

[0028] During winter soil frost heave, the frost heave force acts on the second anchor plate 7 and the third anchor plate 9, causing the first sleeve 6 and the second sleeve 8 to slide upwards. Since the two are not rigidly connected to the anchor rod 1, the frost heave force is not transmitted to the anchor rod 1 and the fastening connection plate 3, ensuring the stability of the power distribution tower foundation. The magnetostrictive displacement sensor monitors the sleeve displacement in real time. When the displacement reaches the preset threshold, the maintenance personnel can rotate the threaded sleeve 10 to drive the adjusting sleeve 13 down, causing the one-way ratchet to re-engage. Continuing to rotate will drive the sleeve to rotate in the opposite direction into the ground, returning it to the initial position and re-forming the frost heave reserved gap.

[0029] Example 2: This example optimizes the sealing performance and structural strength based on Example 1, specifically as follows: Two annular sealing grooves are made on the upper and lower inner walls of the first sleeve 6, the upper and lower inner walls of the second sleeve 8, and the lower inner wall of the adjusting sleeve 13. The grooves are 8mm wide and 5mm deep. Nitrile rubber sealing rings with a cross-sectional diameter of 9mm are installed in the sealing grooves, and they are interference-fitted with the outer wall of the anchor rod 1 with an interference amount of 1mm. This sealing structure can effectively prevent groundwater and silt from entering the gap between the sleeve and the anchor rod after the frozen soil thaws, avoiding the sleeve from getting stuck and unable to slide due to silt accumulation.

[0030] The first anchor plate 5, the second anchor plate 7, and the third anchor plate 9 are all formed by stamping 12mm thick Q355 low alloy steel plates. The welded joints are double-sided fillet welds using E5015 welding rods, with a weld leg height of 8mm. The surfaces of the anchor rod 1, threaded section 2, first sleeve 6, and second sleeve 8 are all coated with a 100μm thick epoxy zinc-rich anti-corrosion primer and an 80μm thick polyurethane anti-corrosion topcoat. The anchoring section 4 and the first anchor plate 5 are additionally covered with a 3mm thick polyethylene anti-corrosion layer, improving corrosion resistance in permafrost regions and extending their service life to over 30 years.

[0031] The lower conical tip of anchoring section 4 is overlaid with a 5mm thick hard alloy layer with a hardness of HRC55 or higher to enhance its wear resistance and facilitate screwing in during construction in frozen soil containing gravel. The threaded surface of threaded section 2 is hot-dip galvanized with a zinc layer thickness of not less than 85μm to prevent thread corrosion from affecting the lifting and lowering operation of the adjusting sleeve.

[0032] Example 3: This example adds intelligent monitoring and remote early warning functions to Example 2, as follows: The magnetostrictive displacement sensor adopts a wireless transmission type, powered by a built-in lithium battery with a battery life of up to 5 years. Data is transmitted to a nearby power distribution tower intelligent monitoring terminal via a LoRa wireless communication module. The terminal then uploads the data to a cloud monitoring platform via a 4G network. The cloud platform has a built-in data analysis module that can display the displacement curves of the two sleeves in real time. When the displacement exceeds 10mm, a yellow warning is automatically issued; when it exceeds 30mm, a red warning is issued, and maintenance personnel are notified via SMS and APP push notifications.

[0033] An electro-hydraulic actuator is integrated at the adjusting nut 12 of the threaded sleeve 10, and the actuator is electrically connected to the intelligent monitoring terminal. When the cloud platform detects that the sleeve displacement exceeds the warning threshold, it can remotely control the electro-hydraulic actuator to rotate the threaded sleeve 10 and automatically complete the sleeve reset operation. No manual on-site operation is required, which greatly improves maintenance efficiency and is especially suitable for power distribution towers in remote and uninhabited areas.

[0034] Meanwhile, an inclination sensor is installed at the bottom of the fastening connection plate 3 to monitor the tilt angle of the power distribution tower foundation in real time. This forms a complementary monitoring system with the sleeve displacement data. When both of them show abnormalities, the system automatically determines the risk of foundation instability and immediately activates the highest level of emergency warning.

[0035] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A frost-resistant spiral anchor for power distribution towers in cold, frozen soil regions, characterized in that, include: An anchor rod, wherein a threaded section is fixedly connected to the upper end of the anchor rod by welding, a fastening connecting plate for connecting to the superstructure is fixedly connected to the top of the threaded section by welding, an anchoring section is fixedly connected to the bottom of the anchor rod by welding, and a first anchoring plate is sleeved on and fixedly connected to the anchoring section by welding. The anchor bolt is provided with a first sleeve and a second sleeve. The first sleeve is slidably engaged with the anchor bolt. A second anchor plate is provided on the first sleeve and fixedly connected by welding. The second sleeve is slidably engaged with the anchor bolt. A third anchor plate is provided on the second sleeve and fixedly connected by welding. The threaded section is fitted with and threadedly connected to a threaded sleeve. An adjusting sleeve is rotatably connected below the threaded sleeve. The lower end of the adjusting sleeve is machined with a first one-way ratchet. The upper end of the first sleeve is machined with a second one-way ratchet that engages with the first one-way ratchet. The lower end of the first sleeve is machined with a third one-way ratchet. The upper end of the second sleeve is machined with a fourth one-way ratchet that engages with the third one-way ratchet. When the threaded sleeve is screwed downward along the threaded section, it drives the adjusting sleeve to descend synchronously, so that the first one-way ratchet and the second one-way ratchet are tightly engaged, and the third one-way ratchet and the fourth one-way ratchet are tightly engaged, thereby making the adjusting sleeve, the first sleeve and the second sleeve and the anchor rod form a synchronously rotating whole; When the threaded sleeve is screwed back upward along the threaded section, it drives the adjusting sleeve to rise synchronously, causing the first one-way ratchet and the second one-way ratchet to separate, thereby allowing the first sleeve and the second sleeve to slide independently up and down relative to the anchor rod.

2. The anti-frost heave spiral anchor for power distribution towers in cold and frozen soil areas according to claim 1, characterized in that, The threaded sleeve has an annular groove at its bottom. The upper end of the adjusting sleeve is fixedly connected to a rotating disk by welding. The rotating disk is embedded in the annular groove. The bottom of the threaded sleeve is also provided with a flange. The flange is fixedly connected to the threaded sleeve by bolts. The flange and the threaded sleeve clamp the rotating disk in the middle, realizing the rotational connection between the adjusting sleeve and the threaded sleeve.

3. The anti-frost heave spiral anchor for power distribution towers in cold and frozen soil areas according to claim 1, characterized in that, The outer wall of the threaded sleeve is welded with a first lever sleeve, which is a hollow tubular structure for inserting a lever to manually rotate the threaded sleeve. The outer wall of the threaded sleeve is also fixedly connected with an adjusting nut by welding. The adjusting nut is a hexagonal nut structure for cooperating with a hydraulic wrench to electrically rotate the threaded sleeve.

4. The anti-frost heave spiral anchor for power distribution towers in cold and frozen soil areas according to claim 1, characterized in that, The outer wall of the adjusting sleeve is welded with a second lever sleeve, which is a hollow tubular structure used to insert a lever to manually rotate the adjusting sleeve. The outer wall of the adjusting sleeve is also fixedly connected with a sleeve reset nut by welding. The sleeve reset nut is a hexagonal nut structure used to cooperate with a hydraulic wrench to electrically rotate the adjusting sleeve.

5. The anti-frost heave spiral anchor for power distribution towers in cold and frozen soil areas according to claim 1, characterized in that, The first anchor plate, the second anchor plate, and the third anchor plate are all continuous spiral structures, and the spiral helix angles and spiral directions of the first anchor plate, the second anchor plate, and the third anchor plate are the same.

6. The anti-frost heave spiral anchor for power distribution towers in cold and frozen soil areas according to claim 1, characterized in that, The upper and lower inner walls of the first sleeve, the upper and lower inner walls of the second sleeve, and the lower inner wall of the adjusting sleeve are all provided with annular sealing grooves. A rubber sealing ring is installed in the annular sealing groove, and the sealing ring is interference-fitted with the outer wall of the anchor rod.

7. The anti-frost heave spiral anchor for power distribution towers in cold and frozen soil areas according to claim 1, characterized in that, The anchor rod is a hollow tubular structure, and a magnetostrictive displacement sensor is fixedly installed in the internal cavity of the anchor rod. The sensing end of the magnetostrictive displacement sensor is respectively aligned with the upper end face of the first sleeve and the upper end face of the second sleeve.

8. The anti-frost heave spiral anchor for power distribution towers in cold and frozen soil areas according to claim 1, characterized in that, The lower end of the anchoring section is machined with a conical tip, the cone angle of which is 30°-45°.

9. The anti-frost heave spiral anchor for power distribution towers in cold and frozen soil areas according to claim 1, characterized in that, The inner ring of the first anchor plate is fixedly connected to the outer wall of the anchoring section by double-sided fillet welds; the inner ring of the second anchor plate is fixedly connected to the outer wall of the first sleeve by double-sided fillet welds; and the inner ring of the third anchor plate is fixedly connected to the outer wall of the second sleeve by double-sided fillet welds.

10. The anti-frost heave spiral anchor for power distribution towers in cold and frozen soil areas according to claim 1, characterized in that, The first, second, third, and fourth unidirectional ratchet teeth are all sawtooth-shaped unidirectional ratchet teeth with a tooth surface inclination angle of 45°-60°, and the tooth direction is consistent with the screwing direction of the spiral anchor.

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