Tower drum self-lifting system and tower drum self-lifting method of multi-section wind power tower

Abstract

The tower tube self-lifting system comprises a lifting device composed of a steel cable, an upper bogie and a hydraulic cylinder, the upper bogie is fixedly installed at the top of an outer tower tube of a to-be-lifted tower tube, the hydraulic cylinder is fixedly installed on the ground outside the fixed tower tube, one end of the steel cable is fixed to a bottom flange of the to-be-lifted tower tube, and the other end of the steel cable is fixed to a bottom flange of the to-be-lifted tower tube. And the other end of the hydraulic cylinder penetrates through the top flange of the adjacent tower drum on the outer side, passes through the upper bogie and is fixed on the hydraulic cylinder. The invention further discloses a tower drum self-lifting method of the multi-section wind power tower. The hydraulic cylinders are installed on the ground, the upper bogie is used for steering the path of the steel cable, so that the steel cable can smoothly reach the ground and is not limited by aerial work any more, more choices are provided for the hydraulic cylinders, and the hydraulic cylinders are convenient to install, replace and maintain.

Description

Technical Field

[0001] The invention relates to a tower self-lifting system and a tower lifting method of a multi-section wind power tower. Background Art

[0002] Traditional multi-section wind towers are generally installed using large-tonnage cranes for section-by-section lifting. For wind towers with a height of more than 120m, a single section of the tower requires a large-tonnage crane of 800t or more. The traditional installation method not only has cumbersome construction procedures, but is also restricted by the lifting capacity of crawler cranes. It is also difficult to transport, and has high transportation and installation costs.

[0003] In order to reduce the difficulty of operation, technicians proposed the tower self-lifting technology, which is based on the outer tower to lift the inner tower. When lifting, the jack is arranged on the upper side of the top flange of the outer tower, and then one end of the steel cable is fixed on the bottom flange of the inner tower. The other end of the steel cable passes through the top flange of the outer tower and is fixed on the jack. Then the jack gradually lifts the inner tower upward through the steel cable until the bottom flange of the inner tower presses against the top flange of the outer tower, and then the steel cable is anchored on the top flange of the outer tower, and the connecting bolts are installed on the top flange and the bottom flange according to the design requirements to connect the two adjacent tower sections into one. This technology can eliminate the large-tonnage crane required and reduce the construction cost of tower lifting. However, since the jack is arranged on the top of the outer tower, there is less working space, and it is high in the air, which is inconvenient to operate and has certain safety hazards. In addition, during the tower hoisting process, when at least part of the steel cables fail, the tower may fall directly to the ground, which not only damages the equipment but also may cause harm to the construction workers. Therefore, there is a strong practical need to improve the safety of the self-hoisting construction method. Summary of the invention

[0004] In order to at least partially solve the unsafe factors in the prior art when using the self-lifting method to install on the tower, the present application first proposes a tower self-lifting system for a multi-section wind turbine tower, the multi-section wind turbine tower comprises at least two sections of towers that can be sequentially sleeved together, wherein the innermost tower is a steel tower, and the other towers are reinforced concrete towers; when the multi-section wind turbine tower is installed, the bottom flange of the inner tower of the two adjacent towers is hoisted on the lower side of the top flange of the outer tower; the outermost tower is called a fixed tower;

[0005] The tower self-lifting system includes at least three lifting devices, which are arranged at intervals around the central axis of the wind power tower. Each lifting device includes a steel cable, an upper bogie and a hydraulic cylinder. The upper bogie is fixedly installed on the top of at least one tower outside the tower to be lifted. The hydraulic cylinder is fixedly installed on the ground outside the fixed tower. One end of the steel cable is fixed on the bottom flange of the tower to be lifted, and the other end of the steel cable passes upward through the anchor hole on the top flange of the outer adjacent tower, then bypasses the upper bogie and extends downward, and then is fixed on the hydraulic cylinder, and the steel cable is slidably supported on the upper bogie.

[0006] Driven by the hydraulic cylinder, the tower to be lifted is lifted upwards via the steel cable; a first clip group is arranged in the anchor hole, and when the steel cable moves upwards relative to the first clip group, the clips of the first clip group can be loosened, so that the steel cable moves upwards relative to the first clip group; when the steel cable moves downwards relative to the first clip group, the clips of the first clip group can be tightly clamped on the steel cable, preventing the steel cable from moving downwards relative to the first clip group. In the present application, the ground outside the fixed tower includes the area where the foundation of the wind turbine tower is located outside the fixed tower and the area outside the foundation.

[0007] The installation of the upper bogie can be carried out according to the number of towers. When there are only one or two towers outside the tower to be lifted, the upper bogie can be installed only on any tower outside the tower to be lifted, or the upper bogie can be installed on all towers outside the tower to be lifted. When there are more than three towers outside the tower to be lifted, due to the long distance between the tower to be lifted and the fixed tower, the two ends of the upper bogie can be installed on the top of the adjacent tower outside the tower to be lifted and the fixed tower, respectively, or the upper bogie can be installed only on the tower located in the middle between the tower to be lifted and the fixed tower. Of course, the upper bogie can also be installed on the top of all towers outside the tower to be lifted at the same time. There are no special requirements for the installation of the upper bogie, as long as it can support the steel cable and enable the steel cable to complete the steering.

[0008] In the present application, the hydraulic cylinder is installed on the ground, and the path of the steel cable is turned by the upper bogie so that the steel cable can reach the ground smoothly. After the hydraulic cylinder is installed on the ground, it is no longer restricted by high-altitude operations, so there are more options for the hydraulic cylinder, and it is convenient to install, replace and maintain the hydraulic cylinder. In the prior art, since the hydraulic cylinder is arranged at the top of the tower, when the hydraulic cylinder needs to be replaced and maintained, it is necessary to use lifting equipment, which increases the danger of the operation. The present application can reduce the danger when the tower is lifted.

[0009] Specifically, in order to reduce the friction of the steel cable, the upper bogie has a first fixed pulley, and the steel cable is pressed against the first fixed pulley.

[0010] Furthermore, each lifting device also includes a lower bogie, and the steel cable is fixed on the hydraulic cylinder after being turned by the lower bogie. The lower bogie is fixedly installed on the ground or the outer wall of the fixed tower.

[0011] By means of the lower bogie, the path of the steel cable can be diverted so that the steel cable can be fixed on the hydraulic cylinder in a set direction.

[0012] In order to further improve the safety during construction, an anti-slip frame is installed on the outer wall of the fixed tower. The anti-slip frame has a second clip group. The clips of the second clip group surround the steel cable. When the steel cable moves downward relative to the second clip group, the clips of the second clip group can be loosened, allowing the steel cable to move downward relative to the second clip group; when the steel cable moves upward relative to the second clip group, the clips of the second clip group can be tightly clamped on the steel cable to prevent the steel cable from moving upward relative to the second clip group. Each first clip group and the second clip group together form an anti-reversal system to prevent the tower being lifted from falling or tilting directly after the steel cable is separated from the hydraulic cylinder. Moreover, after the anti-slip frame is set, the second clip group and the first clip group can serve as spare parts for each other, avoiding the inability to replace the failed clip group after a certain clip group fails, resulting in suspension of tower lifting.

[0013] In the prior art, once a first clip group fails, the lifting of the tower can only be suspended, and a temporary support device needs to be set up under the tower to replace the failed clip group. However, after adding an anti-drop frame, when one of the clip groups fails, the failed clip group can be replaced by using the locking function of other clip groups in the same lifting device.

[0014] Specifically, in order to ensure the normal operation of the second clip group of the anti-slip frame, the anti-slip frame includes a base plate, a second clip group, a spring and an extrusion plate. The base plate is fixed on the outer wall of the fixed tower tube, and has a conical clip hole with a small end facing upward on the base plate. The second clip group is inserted upward into the clip hole, the extrusion plate is located on the lower side of the base plate, and the spring is located between the second clip group and the extrusion plate and is in a compressed state. The steel cable passes through the clip hole from top to bottom, and the clips of the second clip group surround the steel cable. Under the push of the spring, the clips of the second clip group are pressed against the outer peripheral surface of the steel cable. When the steel cable moves downward relative to the second clip group, each clip of the second clip group will move slightly downward under the drive of the friction force of the steel cable, and compress the spring, thereby releasing the lock on the steel cable, and the steel cable can move downward relative to the second clip group. Due to the pushing force of the spring, each clip of the second clip group is always pressed against the outer circumferential surface of the steel cable. When the steel cable moves upward relative to the second clip group, under the action of friction, the clips of the second clip group are tightly inserted into the conical holes and tightly pressed against the outer circumferential surface of the steel cable, locking the steel cable and preventing it from moving upward.

[0015] Furthermore, a plurality of anti-falling devices are arranged between two adjacent towers, and the plurality of anti-falling devices are arranged at intervals around the central axis of the wind turbine tower. Each anti-falling device comprises a support rod and a plurality of support protrusions, and the plurality of support protrusions are arranged at intervals on the inner wall of the outer tower in the height direction, and the support rod is rotatably mounted on the bottom flange of the inner tower; the support rod extends downwardly and can swing in an axial plane, and the axial plane is a vertical plane passing through the central axis of the wind turbine tower, and an elastic member is installed between the support rod and the inner tower;

[0016] During the upward movement of the inner tower, when the support rod passes the support protrusion, under the pressure of the support protrusion, the support rod can swing toward the center of the inner tower and compress the elastic member. After the support rod passes the support protrusion, the elastic member can push the support rod to swing away from the inner tower. When viewed in the vertical direction, when the support rod is free from the pressure of the support protrusion, the lower end of the support rod at least partially overlaps with the support protrusion, so that when the inner tower moves downward, the support rod can press against the upper side of the support protrusion. The support protrusion is specifically formed by the inner wall of the outer tower protruding radially inward.

[0017] At least three anti-fall devices should be provided, and preferably the anti-fall devices are evenly spaced around the central axis of the wind tower. There is no special requirement for the upper limit of the number of anti-fall devices, which can be set according to the diameter of the tower and the pressure that a single anti-fall device can withstand.

[0018] To form a stable support, the support protrusion preferably has a downwardly inclined support surface. When the support rod is supported on the support protrusion, the lower end surface of the support rod is parallel to the support surface so that the support rod and the support protrusion have the largest contact area.

[0019] The support rod and the elastic part together form a ratchet structure. When a steel cable breaks, especially when the broken position of the steel cable is between the first clip group and the bottom flange of the tower to be lifted, the first clip group has lost its function at this time, and the tower to be lifted will tilt or fall directly downward. The direct downward fall of the tower to be lifted will cause the failure of the entire wind tower. Even if the tower to be lifted only tilts by using the traction of other unbroken steel cables and the tower remains intact, correcting the tower is also a very difficult task, and the correction work may still cause the failure of the entire wind tower.

[0020] Using the anti-fall device, when a steel cable breaks and causes the tower to be lifted to fall downward, the anti-fall device can stop the tower from falling in time. When the height spacing of the supporting protrusions is properly set, the tower will at most tilt a small amount, which will not affect the quality of the tower. At this time, the broken steel cable can be replaced, and then the tower can be corrected using the steel cable and continued to be lifted.

[0021] Specifically, when the support rod is free from the squeezing of the support protrusion, the angle between the support rod and the vertical direction is 15-30 degrees. If the angle is too large, it will occupy a large space, and if the angle is too small, it will reduce the contact area between the support rod and the support protrusion when pressing, which is not conducive to forming a stable support effect between the two.

[0022] Furthermore, in order to reduce the space occupied by the support rod, a groove extending in the vertical direction is provided on the outer peripheral surface of the bottom flange of the inner tower tube, the support rod is hinged in the groove, and the two ends of the elastic member are respectively connected to the support rod and the bottom surface of the groove. This design can keep the original design of the bottom flange without changing the existing design parameters due to the addition of the support rod.

[0023] Secondly, the present application also proposes a tower self-lifting method for a multi-section wind power tower, which is performed using any of the tower self-lifting systems described above. The tower self-lifting method comprises the following steps:

[0024] (1) Construct each tower, and install each tower coaxially together;

[0025] (2) Install the bogie and anti-drop frame, and install the hydraulic cylinder on the ground; in addition to the fixed tower, at least one tower section is lifted in the following way:

[0026] (2.1) Fix one end of the steel cable on the bottom flange of the tower to be lifted, pass the other end of the steel cable upward through the anchor hole of the top flange of the adjacent tower on the outside, extend it downward through the upper bogie line, and fix it on the hydraulic cylinder after passing through the anti-drop frame. The steel cable is slidably supported on the upper bogie;

[0027] (2.2) Start the hydraulic cylinder and pull the steel cable to gradually lift the tower to be lifted upward until the bottom flange of the tower to be lifted abuts against the top flange of the outer adjacent tower. Stop the hydraulic cylinder from pulling the steel cable, anchor the steel cable to the top flange of the outer adjacent tower, and cut the remaining steel cable;

[0028] (2.3) During the lifting process of the tower to be lifted, when at least one steel cable is separated from the hydraulic cylinder, the clips of the first clip group and the second clip group can be tightly clamped around the steel cable to prevent the tower to be lifted from falling downward.

[0029] In the present application, since the tower is lifted by means of a hydraulic cylinder on the ground, the operator is required to perform aerial work only when installing, anchoring and cutting the steel cables. During the rest of the time, the rising posture of the hydraulic cylinder and the tower can be monitored on the ground, and the hydraulic cylinder can be maintained, repaired and replaced on the ground, which not only improves the working efficiency but also provides working safety.

[0030] By utilizing the complementary effect of the first clip group and the second clip group, the disadvantage of being unable to replace the hydraulic cylinder when only the first clip group is provided is avoided, and when one of the first clip group and the second clip group fails, the failed one can be replaced to complete the lifting of the tower.

[0031] Furthermore, a plurality of support protrusions are arranged at intervals in the height direction on the inner wall of the tower tube adjacent to the tower tube to be lifted, and a support rod is rotatably installed on the bottom flange of the tower tube to be lifted, the support rod extends downwardly and can swing in an axial plane, the axial plane is a vertical plane passing through the central axis of the wind power tower, and an elastic member is installed between the support rod and the inner tower tube;

[0032] During the lifting process of the tower to be lifted, when the support rod passes through the support protrusion, under the pressure of the support protrusion, the support rod can swing toward the center direction of the tower to be lifted and compress the elastic member, and after the support rod passes through the support protrusion, the elastic member can push the support rod to swing in the direction away from the tower to be lifted; observed in the vertical direction, when the support rod is free from the pressure of the support protrusion, the lower end of the support rod overlaps with the support protrusion at least partially, so that when the tower to be lifted moves downward, the support rod can be pressed against the upper side of the support protrusion;

[0033] During the lifting process of the tower to be lifted, when at least one steel cable fails, the support rod can be supported on the top of the support protrusion to prevent the tower to be lifted from falling downward.

[0034] At least three anti-fall devices should be installed, and preferably the anti-fall devices are evenly spaced around the central axis of the wind tower. There is no special requirement for the upper limit of the anti-fall device, which can be set according to the diameter of the tower and the pressure that a single anti-fall device can withstand.

[0035] The support rod and the elastic part together form a ratchet structure. When a steel cable breaks, especially when the broken position of the steel cable is between the first clip group and the bottom flange of the tower to be lifted, the first clip group has lost its function at this time, and the tower to be lifted will tilt or fall directly downward. The direct downward fall of the tower to be lifted will cause the failure of the entire wind tower. Even if the tower to be lifted only tilts by using the traction of other unbroken steel cables and the tower remains intact, correcting the tower is also a very difficult task, and the entire wind tower may still fail during the correction work.

[0036] Using the anti-fall device, when a steel cable breaks and causes the tower to be lifted to fall downward, the anti-fall device can stop the tower from falling in time. When the height spacing of the supporting protrusions is properly set, the tower will at most tilt a small amount, which will not affect the quality of the tower. At this time, the broken steel cable can be replaced, and then the tower can be corrected using the steel cable and continued to be lifted. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a state diagram of the second section of a multi-section wind tower when it is being lifted.

[0038] Figure 2 yes Figure 1 Enlarged view of part A.

[0039] Figure 3 yes Figure 1 Enlarged view of part B.

[0040] Figure 4 yes Figure 1 Magnified view of part C.

[0041] Figure 5 yes Figure 1 Enlarged view of part D.

[0042] Figure 6 This is a diagram showing the state of the third section of a multi-section wind tower when it is being lifted.

[0043] Figure 7 yes Figure 6 Enlarged view of part E.

[0044] Figure 8 It is a schematic diagram showing that when the second tower section is lifted, the upper bogie is installed on the third tower section and the fixed tower section at the same time. DETAILED DESCRIPTION

[0045] The following first describes the tower self-lifting system of the multi-section wind tower.

[0046] See also Figure 1In this embodiment, the multi-section wind turbine tower includes four tower sections that can be nested together in sequence. For the convenience of description, the tower sections are referred to as the first tower section 11, the second tower section 12, the third tower section 13 and the fourth tower section 14 from the inside to the outside. The first tower section located at the innermost side is a steel tower, and the remaining second tower section, third tower section and fourth tower section are all reinforced concrete towers.

[0047] After the towers are installed in place, the first tower section is located at the top, the fourth tower section is located at the bottom, and in the two adjacent tower sections, the bottom flange of the inner tower is hoisted on the lower side of the top flange of the outer tower. In this embodiment, the first bottom flange 114 of the first tower section is hoisted on the lower side of the second top flange 122 of the second tower section via the first anchor; the second bottom flange 124 of the second tower section is hoisted on the lower side of the third top flange 132 of the third tower section via the second anchor; the third bottom flange 134 of the third tower section is hoisted on the lower side of the fourth top flange 142 of the fourth tower section via the third anchor. The wind blades and the main engine are installed on the first tower section. In the attached drawings, the wind blades and the main engine are not shown, and they can be installed according to the prior art. The above-mentioned top flanges and bottom flanges are also called brackets in the prior art, wherein the top flange is located at the top of the corresponding tower, and the bottom flange is located at the bottom of the corresponding tower. In this embodiment, each tower is cylindrical, and it can be understood that in other embodiments, each tower can also be a regular polygon.

[0048] exist Figure 1 In the embodiment, the first tower section has been lifted and installed on the second tower section, the second tower section is being lifted, and the third tower section is still in place, waiting to be lifted. A second anchor hole 123 for lifting the first tower section is provided on the second top flange 122 of the second tower section, a third anchor hole 133 for lifting the second tower section is provided on the third top flange 132 of the third tower section, and a fourth anchor hole 143 for lifting the third tower section is provided on the fourth top flange 142 of the fourth tower section.

[0049] During construction, the first tower section that has been completed is first arranged at the set position of the foundation 22, and then the second, third and fourth tower sections are constructed in sequence around the first tower section, so that each tower section is sequentially nested together, wherein the first, second and third tower sections are freely supported on the foundation, and the fourth tower section is directly cast on the foundation, so that the fourth tower section and the foundation form an integrated structure. Since the first tower section is a steel tower, it can be made on site or a prefabricated tower can be used, and each reinforced concrete tower is constructed by casting on site. Since the fourth tower section is directly cast on the foundation without lifting, the fourth tower section is called a fixed tower, that is, the outermost tower is called a fixed tower.

[0050] The foundation 22 is a reinforced concrete soil structure. To ensure the stability of the wind power tower, piles 21 are provided at the lower side of the foundation 22 .

[0051] In this embodiment, the tower self-lifting system includes three sets of lifting devices, and the three sets of lifting devices are evenly spaced around the central axis 100 of the wind tower. Each set of lifting devices includes a steel cable 31, an upper bogie 40, a lower bogie 35 and a hydraulic cylinder 36. The upper bogie 40 is fixedly installed on the top of the fixed tower, see Figure 3 The upper bogie 40 specifically includes a cross-shaped support frame 42, which includes a vertical pole 421 extending in the vertical direction and a horizontal pole 422 extending in the radial direction of the wind turbine tower. The lower end of the vertical pole is welded to the embedded steel plate 41 on the upper side of the fourth top flange 142. A first fixed pulley 43 is installed on the top of the vertical pole and the two ends of the horizontal pole, respectively, wherein the outer edge of the first fixed pulley on the horizontal pole facing the radial outside exceeds the outer peripheral surface of the fixed tower barrel outward, and the inner edge of the first fixed pulley on the horizontal pole facing the radial inside exceeds the inner peripheral surface of the fourth top flange 142 inward. The first fixed pulley on the inner side of the horizontal pole is used to ensure that the steel cable can pass through the anchor hole on the top flange of the outer side of the tower barrel to be lifted in the vertical direction; the first fixed pulley on the outer side of the horizontal pole is used to avoid friction between the steel cable and the outer wall of the fixed tower barrel, so as to avoid excessive wear of the steel cable and affect the service life of the steel cable. The first fixed pulley at the top of the vertical pole is mainly used to bear the downward pressure generated by the steel cable. It can be understood that in another embodiment, the first fixed pulley at the top of the vertical pole can be eliminated, so that the steel cable can extend directly from the first fixed pulley on the inside of the cross bar to the fixed pulley on the outside of the cross bar.

[0052] See also Figure 5 The lower bogie 35 includes a fixed frame 351 and a second fixed pulley 352 rotatably mounted on the fixed frame, wherein the fixed frame 351 is fixed on the foundation 22, that is, the lower bogie 35 is fixedly mounted on the ground. It can be understood that in another embodiment, the fixed frame 351 can also be mounted on the outer wall of the fixed tower, that is, the lower bogie 35 is fixedly mounted on the outer wall of the fixed tower.

[0053] Please continue reading Figure 4 The hydraulic cylinder 36 specifically adopts a hollow hydraulic jack. The hydraulic cylinder 36 is horizontally arranged on the foundation. In order to improve the stability of the hydraulic cylinder on the foundation, a support block 23 is also cast on the foundation. The support block 23 is a reinforced concrete structure, and a steel cable hole 231 for the steel cable to pass through is provided in the support block. The hydraulic cylinder is pressed against the side of the support block away from the fixed tower. The hollow hydraulic jack is also called a hollow plunger hydraulic jack. It has a hollow piston rod for clamping the steel cable. The hollow piston rod is also called a hollow plunger. The hollow plunger hydraulic jack is a conventional tensioning tool for the steel cable, and its use method can be based on the existing technology.

[0054] The following uses the wire rope's path when lifting the second tower section 12 to illustrate the use of the wire rope. When lifting the second tower section, the second tower section is the tower to be lifted. Figure 2 One end of the steel cable 31 passes downward through the bottom flange of the second tower section and is fixed by the anchor 311. The other end of the steel cable 31 passes upward through the third anchor hole 133 on the third top flange 132 of the third tower section 13, then bypasses the upper bogie 40 and extends downward. After bypassing the lower bogie 35, it passes through the steel cable hole 231 in the horizontal direction and is locked in the hollow piston rod of the hollow hydraulic jack. When bypassing the upper bogie, the steel cable passes through and presses on each first fixed pulley 43 in turn, so that the steel cable is slidably supported on the upper bogie. The first fixed pulley on the inner side of the cross bar is used to make the steel cable pass through the third anchor hole in the vertical direction so that the clips in the first clip group can surround the steel cable. The first fixed pulley on the outer side of the cross bar is used to make the steel cable leave the outer wall of the fixed tower, reducing the wear on the steel cable. When bypassing the lower bogie 35, the steel cable presses on the second fixed pulley 352, so that the steel cable is slidably supported on the lower bogie.

[0055] Driven by the hydraulic cylinder, the second tower section is lifted upwards via the steel cable. A first clip group 135 is provided in the third anchor hole 133. When the steel cable moves upwards relative to the first clip group, the clips of the first clip group can be loosened, so that the steel cable moves upwards relative to the first clip group; when the steel cable moves downwards relative to the first clip group, the clips of the first clip group can be tightly clamped on the steel cable, preventing the steel cable from moving downwards relative to the first clip group.

[0056] In this embodiment, the hydraulic cylinder is fixed to the foundation, and the path of the steel cable is steered by the lower bogie.

[0057] In order to improve the safety of each tower during the lifting process, in this embodiment, each lifting device further includes two anti-slip frames 50, and the two anti-slip frames 50 are fixed on the outer wall of the fixed tower along the height direction.

[0058] Each anti-slip frame 50 includes a base plate 51, a second clip group 52, a spring 54 and a squeeze plate 55. The base plate is fixed to the outer wall of the fixed tower in the horizontal direction, and a reinforcing plate 512 is welded on the upper side of the base plate. The reinforcing plate is also fixed to the outer wall of the fixed tower. The base plate has a conical clip hole 511 with a small end facing upward. The second clip group 52 is inserted upward into the clip hole 511. The squeeze plate 55 is located at the lower side of the base plate. The clamping bolt 56 passes through the squeeze plate from bottom to top and is screwed on the base plate to hang the squeeze plate on the lower side of the base plate. A cable hole 551 for the steel cable to pass through is opened on the squeeze plate.

[0059] The spring 54 is clamped between the second clip group 52 and the extrusion plate, and the spring 54 is in a compressed state. In this embodiment, the spring is specifically a cylindrical helical compression spring. It can be understood that in other implementations, the spring can also be a tubular rubber spring or a spring sheet. There is no special requirement for the spring, as long as it can push the clips of the second clip group upward and press against the outer peripheral surface of the steel cable. The steel cable passes through the clip hole from top to bottom, and the clips of the second clip group surround the steel cable. Under the push of the spring, the clips are pressed against the outer peripheral surface of the steel cable.

[0060] When the steel cable moves downward relative to the second clip group, driven by the steel cable, the clips of the second clip group move downward and compress the spring, so that the clips of the second clip group are relaxed, and the steel cable can move downward relative to the second clip group; when the steel cable moves upward relative to the second clip group, due to the self-tightening effect of the clips, the clips of the second clip group can be tightly clamped on the steel cable, thereby preventing the steel cable from moving upward relative to the second clip group.

[0061] In order to make the spring push the clips of the second clip group evenly, in this embodiment, a gasket 53 is provided between the second clip group and the spring, and a gasket hole 531 for the steel cable to pass through is provided at the center of the gasket 53. The gasket is only used to compensate for the uneven compression of the clips of the second clip group by the spring. If the spring can compress each clip in the second clip group evenly, the gasket can be eliminated.

[0062] In order to prevent the tower from tilting or falling directly to the ground after some or all of the steel cables fail during the tower lifting process, four anti-falling devices are set between two adjacent towers. The four anti-falling devices are set at intervals around the central axis of the wind turbine tower. The following takes the anti-falling device between the second and third tower sections as an example. Please refer to Figure 2 In this embodiment, each anti-fall device includes a support rod 62 and a plurality of support protrusions 61, which are arranged on the inner wall of the third tower section at intervals along the height direction, and the support protrusions protrude radially inward from the inner wall of the third tower section, that is, the support protrusions protrude radially inward from the inner wall of the outer tower section, and each support protrusion 61 has a support surface 611, which starts from the inner wall of the third tower section and extends downward in an inclined direction in the radial direction. When the support rod is supported on the support protrusion, the lower end surface of the support rod is parallel to the support surface, so that the support rod and the support protrusion have the largest contact area.

[0063] A groove 125 extending in the vertical direction is provided on the outer peripheral surface of the second bottom flange 124 of the second tower section, and the support rod 62 is hinged in the groove 125, and the two side walls of the groove are used to support the support rod, while reducing the space occupied by the support rod. The support rod extends downwardly and can swing in an axial plane, which is a vertical plane passing through the central axis of the wind tower. The two ends of the elastic member 63 are respectively connected to the support rod and the bottom surface 126 of the groove. In this embodiment, the elastic member is specifically a cylindrical helical compression spring.

[0064] During the upward movement of the second section of the tower, when the support rod passes through the support protrusion, under the pressure of the support protrusion, the support rod can swing toward the center of the inner tower and compress the elastic member. After the support rod passes through the support protrusion, the elastic member can push the support rod to swing away from the inner tower. When viewed in the vertical direction, when the support rod is freed from the pressure of the support protrusion, the lower end of the support rod at least partially overlaps with the support protrusion, so that when the inner tower moves downward, the support rod can be pressed against the upper side of the support protrusion.

[0065] In this embodiment, when the support rod is separated from the squeezing of the support protrusion, the angle α between the support rod and the vertical direction is 25°. It can be understood that in other embodiments, the angle α is 15°, 20° or 30°, and of course it can also be other angles between 15-30°. The angle α should not be too small. If it is too small, the contact surface between the support rod and the support protrusion is too small. The angle α should not be too large. If the angle α is too large, the length of the support rod in the radial direction of the wind turbine tower is too long, occupying too much space.

[0066] This embodiment exemplarily illustrates a wind tower structure with 4 tower sections. It can be understood that in other embodiments, according to different installation conditions and the height of the wind tower, the wind tower may also include only 2, 3, 5, 6 or more tower sections.

[0067] See also Figure 6 and Figure 7 When lifting the third tower section, similar to the lifting structure of the second tower section, the upper bogie is still only installed on the top of the fixed tower section. Compared with the second tower section, the third tower section is closer to the fixed tower section. Therefore, it is necessary to move the first fixed pulley 43 on the inner side of the cross bar 422 of the support frame 42 radially outward to meet the lifting of the third tower section.

[0068] It can be understood that in another embodiment, when the second tower section is lifted, the upper bogie can also be installed on the top of the third tower section and the fixed tower section at the same time, see Figure 8In this other embodiment, the upper bogie 40 is installed on the top of the third tower section and the fixed tower section at the same time, wherein the vertical rod 421 of the support frame 42 is still supported on the fourth top flange 142 of the fixed tower section, and an auxiliary rod 423 is installed on the lower side of the cross rod 422, and the auxiliary rod 423 is supported on the third top flange 132 of the third tower section 13, so that the upper bogie 40 is supported on the top of the third tower section and the fixed tower section through the vertical rod and the auxiliary rod. It can be understood that in another embodiment, when the second tower section is lifted, the upper bogie can also be supported only on the third top flange of the third tower section.

[0069] The following is an explanation of a tower self-lifting method for a multi-section wind power tower, which is performed using the tower self-lifting system described above. The tower self-lifting method includes the following steps:

[0070] (1) Construct each tower, and install each tower coaxially together;

[0071] (2) Install the upper bogie and the anti-drop frame on the top and outer wall of the fixed tower respectively, and install the hydraulic cylinder and the lower bogie on the ground; except for the fixed tower, the first tower section, the second tower section and the third tower section are lifted in the following way:

[0072] (2.1) Fix one end of the steel cable on the bottom flange of the tower to be lifted, and pass the other end of the steel cable upward through the anchor hole of the top flange of the adjacent tower on the outside, extend downward through the upper bogie, and after passing through the anti-drop frame, the lower bogie and the steel cable hole in the support block, it is fixed in the hollow piston rod of the hollow hydraulic jack; the steel cable is supported on the first fixed pulley and the second fixed pulley;

[0073] (2.2) Start the hollow hydraulic jack and pull the steel cable to gradually lift the tower to be lifted upward until the bottom flange of the tower to be lifted abuts against the top flange of the outer adjacent tower. Stop pulling the steel cable by the hollow hydraulic jack, anchor the steel cable to the top flange of the outer adjacent tower, and cut the remaining steel cable;

[0074] (2.3) During the lifting process of the tower to be lifted, when part or all of the steel cables are separated from the hollow hydraulic jack, the clips of the first clip group and the second clip group can be tightly clamped around the steel cables to prevent the tower to be lifted from falling downward.

[0075] During the process of lifting the tower to be lifted, when the support rod passes through the support protrusion, under the pressure of the support protrusion, the support rod can swing toward the center direction of the tower to be lifted and compress the elastic member. After the support rod passes through the support protrusion, the elastic member can push the support rod to swing in the direction away from the inner tower.

[0076] During the lifting process of the tower, when part or all of the steel cables fail, the support rod can be supported on the top of the support protrusion to prevent the tower from falling down. The failure of the steel cables includes the steel cables detaching from the hollow hydraulic jack, breaking, and deformation exceeding the design value.

[0077] The following takes the lifting of the second tower section as an example to illustrate the detailed lifting process in step (2):

[0078] (2.1) Fix one end of the steel cable on the second bottom flange of the second tower section, pass the other end of the steel cable upward through the anchor hole of the top flange of the third tower section, extend downward through the upper bogie, and after passing through the anti-drop frame, the lower bogie and the steel cable hole in the support block, it is fixed in the hollow piston rod of the hollow hydraulic jack; the steel cable is supported on the first fixed pulley and the second fixed pulley. Before lifting the second tower section, the lifting of the first tower section has been completed and the first tower section is connected to the top of the second tower section.

[0079] When the steel cable passes through the anti-drop frame, it passes through the clip hole, the central hole of the spring and the cable hole from top to bottom in sequence, and the clips of the second clip group surround the steel cable and are pressed against the outer peripheral surface of the steel cable under the push of the spring.

[0080] (2.2) Start the hollow hydraulic jack and pull the steel cable to gradually lift the second tower section upward until the second bottom flange of the second tower section abuts against the third top flange of the third tower section. Stop pulling the steel cable with the hollow hydraulic jack and anchor the steel cable to the top flange of the third tower section. Then, insert the anchor bolts through the second bottom flange and the third top flange to complete the connection between the second tower section and the third tower section. Cut the remaining steel cable. The first tower section moves downward synchronously with the lifting of the second tower section.

[0081] (2.3) During the lifting process of the second section of the tower, when part or all of the steel cables are detached from the hollow hydraulic jack, the clips of the first clip group and the second clip group can be tightly clamped around the steel cables to prevent the tower to be lifted from falling downward.

[0082] During the lifting process of the second section of the tower, when the support rod passes through the support protrusion, under the squeezing of the support protrusion, the support rod can swing toward the center of the tower to be lifted and compress the elastic part. After the support rod passes through the support protrusion, the elastic part can push the support rod to swing away from the inner tower.

[0083] During the lifting process of the second tower section, when part or all of the steel cables fail, the support rods can support the top of the support bumps to prevent the tower to be lifted from falling down. Steel cable failure includes the steel cable detaching from the hollow hydraulic jack, breaking, and deformation exceeding the design value.

[0084] The lifting of the third tower section is the same as that of the second tower section. The lifting of the first tower section can be completed by the same lifting method as the second tower section, or by cranes and other lifting equipment. Since the first tower section is a steel tower, it is relatively light in weight, so it will have a higher lifting efficiency when it is lifted by cranes and other lifting equipment.

Claims

1. A self-lifting system for a multi-section wind tower, characterized in that: The multi-section wind turbine tower comprises at least two sections of towers that can be sequentially nested together, wherein the innermost tower is a steel tower, and the remaining towers are reinforced concrete towers; when the multi-section wind turbine tower is installed, the bottom flange of the inner tower of the two adjacent towers is hoisted on the lower side of the top flange of the outer tower; the outermost tower is called a fixed tower; The tower self-lifting system includes at least three lifting devices, which are arranged at intervals around the central axis of the wind power tower. Each lifting device includes a steel cable, an upper bogie and a hydraulic cylinder. The upper bogie is fixedly installed on the top of at least one tower outside the tower to be lifted. The hydraulic cylinder is fixedly installed on the ground outside the fixed tower. One end of the steel cable is fixed on the bottom flange of the tower to be lifted, and the other end of the steel cable passes upward through the anchor hole on the top flange of the outer adjacent tower, then bypasses the upper bogie and extends downward, and then is fixed on the hydraulic cylinder, and the steel cable is slidably supported on the upper bogie. Driven by the hydraulic cylinder, the tower to be lifted is lifted upwards via the steel cable; a first clamping piece group is arranged in the anchor hole, and when the steel cable moves upwards relative to the first clamping piece group, the clamping pieces of the first clamping piece group can be loosened, so that the steel cable moves upwards relative to the first clamping piece group; When the steel cable moves downward relative to the first clip set, the clips of the first clip set can be tightly clamped on the steel cable to prevent the steel cable from moving downward relative to the first clip set.

2. The tower self-lifting system according to claim 1, characterized in that: The upper bogie has a first fixed pulley, and the steel cable is pressed against the first fixed pulley.

3. The tower self-lifting system according to claim 1, characterized in that: Each lifting device also includes a lower bogie, and the steel cable is fixed on the hydraulic cylinder after being turned by the lower bogie. The lower bogie is fixedly installed on the ground or the outer wall of the fixed tower.

4. The tower self-lifting system according to claim 1, characterized in that: An anti-slip frame is installed on the outer wall of the fixed tower barrel, and the anti-slip frame has a second clip group. The clips of the second clip group surround the steel cable. When the steel cable moves downward relative to the second clip group, the clips of the second clip group can be loosened, allowing the steel cable to move downward relative to the second clip group; when the steel cable moves upward relative to the second clip group, the clips of the second clip group can be tightly clamped on the steel cable, preventing the steel cable from moving upward relative to the second clip group.

5. The tower self-lifting system according to claim 4, characterized in that: The anti-slip frame includes a base plate, a second clip group, a spring and an extrusion plate. The base plate is fixed on the outer wall of the fixed tower cylinder, and is provided with a conical clip hole with a small end facing upward. The second clip group is inserted upward into the clip hole, and the extrusion plate is located on the lower side of the base plate. The spring is located between the second clip group and the extrusion plate and is in a compressed state. The steel cable passes through the clip hole from top to bottom, and the clips of the second clip group surround the steel cable. Under the push of the spring, the clips of the second clip group are pressed against the outer circumferential surface of the steel cable.

6. The tower self-lifting system according to claim 1, characterized in that: A plurality of anti-falling devices are also arranged between two adjacent towers, and the plurality of anti-falling devices are arranged at intervals around the central axis of the wind turbine tower. Each anti-falling device includes a support rod and a plurality of support protrusions, and the plurality of support protrusions are arranged at intervals along the height direction on the inner wall of the outer tower, and the support rod is rotatably mounted on the bottom flange of the inner tower; the support rod extends downwardly and can swing in an axial plane, and the axial plane is a vertical plane passing through the central axis of the wind turbine tower, and an elastic member is installed between the support rod and the inner tower; During the upward movement of the inner tower, when the support rod passes through the support protrusion, under the pressure of the support protrusion, the support rod can swing toward the center of the inner tower and compress the elastic member. After the support rod passes through the support protrusion, the elastic member can push the support rod to swing away from the inner tower. When viewed in the vertical direction, when the support rod is freed from the pressure of the support protrusion, the lower end of the support rod at least partially overlaps with the support protrusion, so that when the inner tower moves downward, the support rod can be pressed against the upper side of the support protrusion.

7. The tower self-lifting system according to claim 6, characterized in that: When the support rod is released from the squeezing of the support protrusion, the angle between the support rod and the vertical direction is 15-30°.

8. The tower self-lifting system according to claim 6, characterized in that: A groove extending in the vertical direction is arranged on the outer peripheral surface of the bottom flange of the inner tower, the support rod is hinged in the groove, and the two ends of the elastic member are respectively connected to the support rod and the bottom surface of the groove.

9. A method for self-lifting a multi-section wind tower, characterized in that: The tower self-lifting system according to any one of claims 1 to 8 is used, and the tower self-lifting method comprises the following steps: (1) Construct each tower, and install each tower coaxially together; (2) Install the bogie and anti-drop frame, and install the hydraulic cylinder on the ground; in addition to the fixed tower, at least one tower section is lifted in the following way: (2.1) Fix one end of the steel cable on the bottom flange of the tower to be lifted, pass the other end of the steel cable upward through the anchor hole of the top flange of the adjacent tower on the outside, extend it downward through the upper bogie line, and fix it on the hydraulic cylinder after passing through the anti-drop frame. The steel cable is slidably supported on the upper bogie; (2.2) Start the hydraulic cylinder and pull the steel cable to gradually lift the tower to be lifted upward until the bottom flange of the tower to be lifted abuts against the top flange of the outer adjacent tower. Stop the hydraulic cylinder from pulling the steel cable, anchor the steel cable to the top flange of the outer adjacent tower, and cut the remaining steel cable; (2.3) During the lifting process of the tower to be lifted, when at least one steel cable is separated from the hydraulic cylinder, the clips of the first clip group and the second clip group can be tightly clamped around the steel cable to prevent the tower to be lifted from falling downward.

10. The tower self-lifting method according to claim 1, characterized in that: A plurality of support protrusions are arranged at intervals in the height direction on the inner wall of the tower barrel adjacent to the tower barrel to be lifted, and a support rod is rotatably installed on the bottom flange of the tower barrel to be lifted. The support rod extends downwardly and can swing in an axial plane, which is a vertical plane passing through the central axis of the wind turbine tower, and an elastic member is installed between the support rod and the inner tower barrel; During the lifting process of the tower to be lifted, when the support rod passes through the support protrusion, under the pressure of the support protrusion, the support rod can swing toward the center direction of the tower to be lifted and compress the elastic member, and after the support rod passes through the support protrusion, the elastic member can push the support rod to swing in the direction away from the tower to be lifted; observed in the vertical direction, when the support rod is free from the pressure of the support protrusion, the lower end of the support rod overlaps with the support protrusion at least partially, so that when the tower to be lifted moves downward, the support rod can be pressed against the upper side of the support protrusion; During the lifting process of the tower to be lifted, when at least one steel cable fails, the support rod can be supported on the top of the support protrusion to prevent the tower to be lifted from falling downward.

Images