A special segment for correcting the verticality of a tower crane tower

Abstract

The application discloses a special section for correcting the verticality of a tower body of a tower crane, and belongs to the technical field of building construction. The special section is arranged between a pre-buried supporting leg and a standard section of the tower body of the tower crane, comprises four main limbs distributed in a rectangular shape, and is connected between side walls of adjacent main limbs. A mounting cavity is arranged in the middle part of the main limb. A male joint is arranged at the upper end of the mounting cavity. The male joint is slidably connected to the upper end of the main limb. A hydraulic oil cylinder is arranged in the mounting cavity. One end of the hydraulic oil cylinder is fixed in the mounting cavity. The other end of the hydraulic oil cylinder is connected with the male joint. The hydraulic oil cylinder is used for controlling the sliding distance of the male joint at the end of the main limb. A female joint is arranged at the lower end of the main limb. A connecting bolt is arranged on the female joint. The connecting bolt is used for fixing the female joint on the lower end of the main limb. The technical scheme is used for accurately correcting the verticality of the tower body, and ensures that the tower crane is quickly restored to a safe use state.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to a special section for correcting the verticality of tower crane towers. Background Technology

[0002] Tower cranes play an indispensable role in modern construction engineering, and their verticality is a crucial indicator for evaluating the installation quality and operational status of tower cranes. On construction sites, tower cranes, being large and frequently used equipment, may experience uneven settlement due to insufficient foundation bearing capacity or inadequate curing of concrete after pouring, leading to a tower crane's verticality exceeding the 4‰ safety standard, thus posing a serious safety hazard. To eliminate this hazard, construction typically requires dismantling the tower crane, fabricating a corrective section, and reinstalling it. However, this process is not only extremely costly and increases expenses, but also extends the project timeline. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a special section for correcting the verticality of a tower crane, so as to accurately correct the verticality of the tower and ensure that the tower crane is quickly restored to a safe operating state.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A special section for correcting the verticality of a tower crane tower body is installed between the embedded legs and standard sections of the tower crane tower body. It includes four rectangularly distributed main members, with the sidewalls of adjacent main members interconnected. Each main member has a mounting cavity in its middle, and a male connector is located at the upper end of the mounting cavity. The male connector is slidably connected to the upper end of the main member. A hydraulic cylinder is installed within the mounting cavity, with one end fixed inside the cavity and the other end connected to the male connector. The hydraulic cylinder controls the sliding distance of the male connector at the end of the main member. A female connector is located at the lower end of each main member, and a connecting bolt is mounted on the female connector. The connecting bolts fix the female connector to the lower end of the main limb. An installation platform is provided between the upper ends of the four rectangularly distributed main limbs. A connecting rod is provided at each of the four corners of the installation platform. One end of each of the four connecting rods is fixed to the four corners of the installation platform, and the other end of each of the four connecting rods is fixed to the outer surface of the upper end of the four main limbs. An installation bracket is provided on the installation platform. One end of the installation bracket is fixed to the installation platform, and the other end of the installation bracket is provided with a ring laser emitter and an alarm component from bottom to top. A laser receiver is provided on the outer surface of the upper end of each main limb to receive the laser beam emitted by the ring laser emitter.

[0005] Furthermore, a support seat is provided inside the mounting cavity. One end of the support seat is fixed to the lower inner side of the mounting cavity, and the other end of the support seat is fixed to a hydraulic cylinder. Several threaded sleeves are provided on the upper inner side of the mounting cavity. The outer side of the threaded sleeves is fixed to the side wall of the mounting cavity. A lifting bolt is provided inside the threaded sleeve. The lifting bolt is threadedly connected to the threaded sleeve and is used to support the male connector.

[0006] Furthermore, each of the two adjacent sides of the main limb is provided with two vertically distributed transverse web members. Each transverse web member is provided with several pin holes, and a pin is provided in each pin hole. The pin is used to fix the transverse web members provided on the two adjacent main limbs together. The connecting rod is a telescopic rod.

[0007] Furthermore, the upper end of the hydraulic cylinder is provided with a lower fixing block, the lower surface of which is fixed to the hydraulic cylinder. The lower end of the male connector is provided with an upper fixing block, which is fixed to the male connector. Between the lower and upper fixing blocks, there are several rhomboid frames arranged side by side. Each rhomboid frame consists of four connecting rods of the same length. The lower fixing block is provided with a lower rotating shaft, and the lower ends of the rhomboid frames are rotatably connected to the lower rotating shaft. The upper fixing block is provided with an upper rotating shaft, and the upper ends of the rhomboid frames are rotatably connected to the upper rotating shaft. Between the upper and lower rotating shafts, there are middle rotating shafts arranged side by side. The two ends of the middle section of each rhomboid frame are rotatably connected to two middle rotating shafts. Each of the two middle rotating shafts is provided with several rollers, which are fixed to the middle rotating shafts and located between adjacent rhomboid frames.

[0008] Furthermore, threaded holes are provided on both sides of the mounting cavity, and a clamping bolt is provided in the threaded hole. The clamping bolt is threadedly connected to the threaded hole, and a push plate is provided at the end of the clamping bolt. The push plate is rotatably connected to the clamping bolt, and the push plate is located between the roller and the side wall of the mounting cavity.

[0009] Furthermore, both ends of the push plate are provided with connecting ears, and each connecting ear is provided with a sliding rod. The two ends of the sliding rod are fixed to the side of the mounting cavity, and the connecting ear is slidably connected to the sliding rod.

[0010] Furthermore, the upper end of the push plate is symmetrically provided with baffles, which are fixed on both sides of the male connector. The baffles are provided with threaded holes that match the lifting bolts. Both ends of the push plate are provided with fixing seats, which are used to fix the threaded sleeve to the inner wall of the mounting cavity.

[0011] Furthermore, the push plate is provided with a bearing, the outer ring of the bearing is fixed to the push plate, and the inner ring of the bearing is fixed to the clamping bolt.

[0012] The beneficial effects of this invention are as follows: This technical solution can quickly and conveniently solve the problem of tower crane verticality exceeding the standard due to uneven foundation settlement. It can also monitor the levelness of the tower crane base section in real time and accurately, thereby determining whether the tower verticality exceeds the standard, and providing a reliable guarantee for the safe operation of the tower crane.

[0013] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0014] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the installation of a special section of the present invention; Figure 2 This is a three-dimensional schematic diagram of a special section of the present invention; Figure 3 This is a three-dimensional schematic diagram of the male and female connectors in a specific section of the present invention; Figure 4 This is a three-dimensional schematic diagram of the ring laser emitter in a special section of the present invention; Figure 5 This is a three-dimensional schematic diagram of the components such as the rhomboid frame installed inside the cavity in a special section of the present invention; Figure 6 This is a front view schematic diagram of the components such as the rhomboid frame installed inside the cavity in a special section of the present invention; Figure 7 This is a three-dimensional schematic diagram of the internal structure of the cavity in a special section of the present invention, showing the components such as the rhomboid frame installed inside. Figure 8 This is an exploded view of the components such as the rhomboid frame installed inside the cavity in a special section of the present invention.

[0015] The following labels are shown in the attached diagram: 1. Main limb; 2. Female connector; 3. Connecting bolt; 4. Support base; 5. Male connector; 6. Hydraulic cylinder; 7. Threaded sleeve; 8. Lifting bolt; 9. Sealing plate; 10. Horizontal web bar; 11. Pin hole; 12. Pin shaft; 13. Mounting platform; 14. Connecting rod; 15. Mounting bracket; 16. Ring laser transmitter; 17. Alarm assembly; 18. Laser receiver; 19. Laser beam; 20. Embedded support leg; 21. Standard section; 22. Special section; 23. Diamond frame; 24. Lower fixing block; 25. Lower rotating shaft; 26. Middle rotating shaft; 27. Upper fixing block; 28. Upper rotating shaft; 29. ​​Roller; 30. Push plate; 31. Connecting lug; 32. Clamping bolt; 33. Bearing; 34. Slide rod; 35. Baffle; 36. Fixed base. Detailed Implementation

[0016] like Figures 1-8 As shown, a special section 22 for correcting the verticality of a tower crane tower body is arranged between the pre-embedded legs 20 and the standard section 21 of the tower crane tower body. It includes four rectangularly distributed main limbs 1, with the side walls of adjacent main limbs 1 interconnected. A mounting cavity is provided in the middle of each main limb 1, and a detachable sealing plate 9 (bolted connection) is provided outside the mounting cavity. A male connector 5 is provided at the upper end of the mounting cavity, slidably connected to the upper end of the main limb 1. A hydraulic cylinder 6 is provided inside the mounting cavity, one end of which is fixed inside the mounting cavity, and the other end of which is connected to the male connector 5. The hydraulic cylinder 6 is used to control the sliding distance of the male connector 5 at the end of the main limb 1. A female connector 2 is provided at the lower end of the main limb 1, and a connecting bolt 3 is provided on the female connector 2. Bolt 3 fixes the female connector 2 to the lower end of the main limb 1. An installation platform 13 is provided between the upper ends of the four rectangularly distributed main limbs 1. A connecting rod 14 is provided at each of the four corners of the installation platform 13. One end of the four connecting rods 14 is fixed to the four corners of the installation platform 13, and the other end of the four connecting rods 14 is fixed to the outer surface of the upper end of the four main limbs 1. An installation bracket 15 is provided on the installation platform 13. One end of the installation bracket 15 is fixed to the installation platform 13. The other end of the installation bracket 15 is provided with a ring laser emitter 16 and an alarm component 17 (a sound and light alarm component in the prior art of China) from bottom to top. A laser receiver 18 is provided on the outer surface of the upper end of the main limb 1 to receive the laser beam 19 emitted by the ring laser emitter 16.

[0017] The special section 22 is installed between the pre-embedded support leg 20 and the standard section 21, and each of its four main limbs 1 is equipped with a hydraulic cylinder 6. When the tower tilts due to foundation settlement, the ring laser emitter 16 on the installation platform 13 emits a horizontal laser surface in all directions. The laser receivers 18 on the outer sides of the four main limbs 1 detect the offset of the laser surface relative to its own installation height and transmit the signal to the control system. The control system calculates the required compensation height for each main limb 1 based on the deviation values ​​in the four directions and drives the hydraulic cylinder 6 in the corresponding main limb 1. The hydraulic cylinder 6 pushes the male connector 5 to slide upward along the installation cavity of the main limb 1, increasing the effective length of the main limb 1. Since the extension of the four main limbs 1 can be controlled independently, the upper end face of the special section 22 can be adjusted to be absolutely horizontal, thereby compensating for the tilt of the bottom of the tower. After the male connector 5 slides into place, the hydraulic cylinder 6 holds the pressure and locks, and at the same time, the female connector 2 at the lower end of the main limb 1 is firmly connected to the pre-embedded support leg 20 through the connecting bolt 3, forming a stable support. The mounting platform 13 and connecting rod 14 ensure that the relative positions of the upper ends of the four main limbs 1 remain consistent during the adjustment process to avoid generating additional bending moments. The alarm component 17 issues an alarm when the deviation exceeds the cylinder adjustment range or when the system malfunctions.

[0018] This solution enables precise verticality correction without dismantling the tower crane, avoiding the cumbersome procedures and prolonged downtime associated with traditional methods, such as dismantling, fabricating corrective sections, and reinstalling them. It employs a hydraulic cylinder 6 to drive the extension and retraction of the male connector 5, ensuring high adjustment precision. Furthermore, the four independent cylinders can provide vector compensation for tilt in any direction, adapting to various uneven settlement conditions. A closed-loop monitoring system consisting of a ring laser emitter 16 and multiple laser receivers 18 provides real-time visualization and automatic control of the correction process, eliminating the need for repeated manual measurements. Compared to one-time corrective sections, this solution allows for multiple adjustments based on settlement development during subsequent use of the tower crane, significantly extending the safe operating cycle.

[0019] In one feasible embodiment, a support seat 4 is provided inside the mounting cavity. One end of the support seat 4 is fixed to the lower inner side of the mounting cavity, and the other end of the support seat 4 is fixed to the hydraulic cylinder 6. Several threaded sleeves are provided on the upper inner side of the mounting cavity. The outer side of the threaded sleeves is fixed to the side wall of the mounting cavity. A lifting bolt 8 is provided inside the threaded sleeve. The lifting bolt 8 is threadedly connected to the threaded sleeve and is used to support the male connector 5.

[0020] A support seat 4 is installed on the inner side of the lower end of the mounting cavity. The cylinder body of the hydraulic cylinder 6 is fixed in the mounting cavity through the support seat 4 to ensure that the cylinder will not move axially or sway radially during the lifting process. After the cylinder lifts the male connector 5 to the predetermined height, the operator tightens several lifting bolts 8 distributed on the inner side of the upper end of the mounting cavity. The lifting bolts 8 rotate and feed inside the threaded sleeve, and their lower ends tightly abut against the side wall of the male connector 5 or the pre-set load-bearing step, transferring the vertical load of the tower body borne by the male connector 5 from the hydraulic cylinder 6 to the lifting bolts 8 and the wall of the mounting cavity. At this time, the hydraulic cylinder 6 can be depressurized and returned to its original position, serving only as an adjustment element and not bearing pressure for a long time.

[0021] Support base 4 provides a stable mounting foundation for the hydraulic cylinder, preventing it from tilting or being damaged due to uneven force during operation. The lifting bolt 8, as a mechanical locking device, achieves a safety redundancy of "hydraulic adjustment and mechanical locking." Even if the hydraulic system fails due to leakage, power outage, or aging of the cylinder seals, the lifting bolt 8 can still independently bear the entire load, preventing the tower from suddenly falling. Simultaneously, removing the long-term pressure holding of the hydraulic cylinder extends the service life of hydraulic components and reduces energy consumption and maintenance costs. This structure is simple and reliable, suitable for harsh construction site environments.

[0022] In one feasible embodiment, two vertically distributed transverse web members 10 are provided on each of the adjacent two sides of the main limb 1. Each transverse web member 10 is provided with several pin holes 11. A pin shaft 12 is provided in the pin hole 11. The pin shaft 12 fixes the transverse web members 10 provided on the two adjacent main limbs 1 in a fixed connection. The connecting rod 14 is a telescopic rod.

[0023] The four main limbs 1 are arranged in a rectangular pattern. Two vertically distributed transverse web members 10 are positioned between the sides of adjacent main limbs 1. Each transverse web member 10 has multiple locating pin holes 11 machined along its length. By inserting pins 12 into the pin holes 11 at different positions, the overlap length of two adjacent transverse web members 10 can be changed, thereby adjusting the lateral spacing between the two main limbs 1. After the spacing of the four main limbs 1 is adjusted independently or synchronously, rectangular cross-sections of different sizes can be formed to match standard sections 21 of different specifications (such as 1.2m×1.2m, 1.5m×1.5m, 1.8m×1.8m, etc.). Simultaneously, the connecting rod 14 between the installation platform 13 and the upper outer side of the main limbs 1 is designed as a telescopic rod, whose length can be adjusted synchronously with the change in the spacing of the main limbs 1, ensuring that the installation platform 13 is always located at the geometric center of the four main limbs 1 and remains horizontal.

[0024] This design allows the same special section 22 to be adapted to various tower crane standard sections 21, eliminating the need to manufacture separate straightening sections for each specification, significantly reducing manufacturing costs and inventory requirements. The multi-hole selection on the horizontal web members 10 allows for quick and reliable spacing adjustment with high connection rigidity, effectively transmitting bending moments and shear forces. The telescopic connecting rod 14 matches the adjustable spacing, ensuring the ring laser emitter 16 remains centered and level at its installation reference. Compared to traditional fixed straightening sections, this solution significantly improves product versatility and field adaptability, making it particularly suitable for rental companies or construction sites with multiple tower crane models.

[0025] In one feasible embodiment, the upper end of the hydraulic cylinder 6 is provided with a lower fixing block 24, the lower surface of which is fixed to the hydraulic cylinder 6. The lower end of the male connector 5 is provided with an upper fixing block 27, which is fixed to the male connector 5. Several rhomboid frames 23 are arranged side-by-side between the lower fixing block 24 and the upper fixing block 27. Each rhomboid frame 23 consists of four connecting rods of the same length. A lower rotating shaft 25 is provided on the lower fixing block 24. The lower surfaces of the rhomboid frames 23... The upper ends of the rhomboid frames 23 are rotatably connected to the lower rotating shaft 25. The upper fixed block 27 is provided with an upper rotating shaft 28. The upper ends of the rhomboid frames 23 are rotatably connected to the upper rotating shaft 28. A middle rotating shaft 26 is arranged side by side between the upper rotating shaft 28 and the lower rotating shaft 25. The two ends of the middle part of the rhomboid frames 23 are respectively rotatably connected to the two middle rotating shafts 26. Each of the two middle rotating shafts 26 is provided with a number of rollers 29. The rollers 29 are fixed to the middle rotating shafts 26 and are located between adjacent rhomboid frames 23. Threaded holes are provided on both sides of the mounting cavity. A clamping bolt 32 is provided in the threaded hole. The clamping bolt 32 is threaded into the threaded hole. A push plate 30 is provided at the end of the clamping bolt 32. The push plate 30 is rotatably connected to the clamping bolt 32 and is located between the roller 29 and the side wall of the mounting cavity.

[0026] Within the mounting cavities of the four main limbs 1, several rhomboid frames 23 are arranged side-by-side between the upper end of the hydraulic cylinder 6 and the lower end of the male connector 5. Each rhomboid frame 23 is hinged together from four rods of equal length, inherently exhibiting geometric instability: without lateral restraint, it easily bulges and deforms to both sides under vertical pressure, failing to stably transmit lifting force. This design cleverly utilizes this characteristic—push plates 30 are installed on both sides of the rhomboid frame 23, controlled by clamping bolts 32, and can move laterally along the sliding rod 34. In the initial adjustment stage: the hydraulic cylinder 6 lifts the lower fixing block 24 upwards. At this time, the push plates 30 on both sides are pre-adjusted by the clamping bolts 32 to just fit and restrict the lateral outward expansion deformation of the rhomboid frame 23. Since the rhomboid frame 23 cannot bulge to both sides, its instability is transformed into forced vertical elongation, thereby pushing the upper fixing block 27 and the male connector 5 upwards, achieving rapid, large-stroke height compensation. Fine adjustment stage: After the hydraulic cylinder 6 completes the initial lifting and pressure holding, the operator continues to tighten the clamping bolts 32 on both sides, pushing the push plate 30 further to press the sides of the rhombus frame 23 towards the center. Under the pressure from both sides, the included angle between the connecting rods of the rhombus frame 23 is forced to decrease, and the height of the rhombus frame 23 increases slightly accordingly. Since the pitch of the clamping bolts 32 is very small (usually 1.5~2mm), the push plate 30 moves only one pitch per rotation, and the height change transmitted to the rhombus frame 23 can be controlled at the 0.1mm level, thus achieving micron-level fine adjustment. At the same time, the push plate 30 finally locks the rhombus frame 23 tightly between the two sides, completely eliminating its lateral freedom and stably supporting the male connector 5.

[0027] This combined solution transforms the "instability" of the rhombus frame 23 from a disadvantage into an advantage, achieving two-stage adjustment: the hydraulic cylinder 6 provides a large-stroke, high-efficiency initial lifting, while the clamping bolt 32 and push plate 30 provide stepless, high-precision fine-tuning and locking. Compared to solutions relying solely on the hydraulic cylinder 6, this solution avoids the creeping and overshoot problems that easily occur in hydraulic systems during fine-tuning, because the fine adjustment is entirely driven by mechanical threads, resulting in good linearity and high repeatability. Simultaneously, the lateral constraint of the push plate 30 on the rhombus frame 23 significantly improves the overall mechanism's resistance to lateral loads; even when the tower body is subjected to wind loads or eccentric loads, the rhombus frame 23 will not experience lateral instability. This structure integrates initial adjustment, fine adjustment, and safety locking into a compact design, suitable for the confined internal space of the main limb 1 of a tower crane.

[0028] In one feasible embodiment, the push plate 30 has connecting ears 31 at both ends, and a slide rod 34 is provided on the connecting ears 31. The two ends of the slide rod 34 are fixed to the side of the mounting cavity, and the connecting ears 31 are slidably connected to the slide rod 34.

[0029] The push plate 30 has connecting ears 31 at both ends, and a slide rod 34 passes through the connecting ears 31. The two ends of the slide rod 34 are fixed to the side of the mounting cavity. When the tightening bolt 32 is rotated, the push plate 30 moves in a straight line under the guidance of the slide rod 34 without rotation or skew. The slide rod 34 and the connecting ears 31 are fitted with a clearance fit (H7 / g6) and are coated with grease to ensure smooth sliding.

[0030] The guide pair formed by the slide rod 34 and the connecting lug 31 ensures that the push plate 30 remains parallel to the sidewall of the mounting cavity during movement, thus distributing the pressure of the push plate 30 on the roller 29 evenly across the entire width of the roller 29 and avoiding one-sided pressing or point contact. Simultaneously, this structure prevents the push plate 30 from rotating due to the rotation of the clamping bolt 32, avoiding scratches of the roller 29 or the mounting cavity wall by the edge of the push plate 30. Compared to a connection relying solely on the rotation of the bolt ends, this increases the supporting rigidity of the push plate 30, preventing warping deformation when subjected to the reaction force of the roller 29. This guide structure is simple, reliable, and easy to manufacture and maintain in the field.

[0031] In one feasible embodiment, the upper end of the push plate 30 is symmetrically provided with baffles 35, and the symmetrically provided baffles 35 are respectively fixed on both sides of the male connector 5. The baffles 35 are provided with threaded holes that match the lifting bolts 8. Both ends of the push plate 30 are provided with fixing seats 36, which are used to fix the threaded sleeve 7 to the inner wall of the mounting cavity.

[0032] This design applies the mechanical locking force directly to the male connector 5 body, rather than indirectly locking through the diamond frame 23 or push plate 30, thus avoiding the impact of backlash and elastic deformation in the transmission chain on locking accuracy. The baffle 35 is fixedly connected to the male connector 5, and after the lifting bolt 8 engages with the threaded baffle 35, a rigid connection is established between the male connector 5 and the mounting cavity wall, resulting in the most direct and reliable locking effect. The fixed seat 36 ensures that the threaded sleeve 7 will not rotate or move axially during long-term use, thereby guaranteeing that the positioning reference of the lifting bolt 8 remains unchanged. Furthermore, this structure integrates hydraulic adjustment and mechanical locking functions; operators only need to tighten the lifting bolt 8 after lifting, eliminating the need for additional parts and simplifying the operation process.

[0033] In one feasible embodiment, a bearing 33 is provided on the push plate 30, with the outer ring of the bearing 33 fixed to the push plate 30 and the inner ring of the bearing 33 fixed to the clamping bolt 32. The bearing 33 enables a rotatable connection, improving the rotational efficiency.

[0034] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A special section for correcting the verticality of a tower crane tower body, disposed between the pre-embedded legs and the standard section of the tower crane tower body, characterized in that: The device includes four rectangularly distributed main limbs, with their sidewalls interconnected. Each main limb has a mounting cavity in its middle, and a male connector at its upper end. The male connector is slidably connected to the upper end of the main limb. A hydraulic cylinder is housed within the mounting cavity, with one end fixed inside and the other end connected to the male connector. The hydraulic cylinder controls the sliding distance of the male connector at the end of the main limb. A female connector is located at the lower end of each main limb, and a connecting bolt is mounted on the female connector. The connecting bolt secures the female connector to the lower end of the main limb. An installation platform is provided between the upper ends of the four main limbs arranged in a circular pattern. Each of the four corners of the installation platform is provided with a connecting rod. One end of each of the four connecting rods is fixed to one of the four corners of the installation platform, and the other end of each of the four connecting rods is fixed to the outer surface of the upper end of the four main limbs. An installation bracket is provided on the installation platform. One end of the installation bracket is fixed to the installation platform, and the other end of the installation bracket is provided with a ring laser emitter and an alarm component in sequence from bottom to top. Each outer surface of the upper end of the main limb is provided with a laser receiver for receiving the laser beam emitted by the ring laser emitter.

2. A special section for correcting the verticality of a tower crane tower body according to claim 1, characterized in that: The mounting cavity is provided with a support seat. One end of the support seat is fixed to the lower inner side of the mounting cavity, and the other end of the support seat is fixed to a hydraulic cylinder. The upper inner side of the mounting cavity is provided with several threaded sleeves. The outer side of the threaded sleeves is fixed to the side wall of the mounting cavity. The threaded sleeves are provided with lifting bolts, which are threadedly connected to the threaded sleeves and used to support the male connector.

3. A special section for correcting the verticality of a tower crane tower body according to claim 1, characterized in that: Each of the two adjacent sides of the main limb has two vertically distributed transverse web members. Each transverse web member has several pin holes, and a pin is installed in each pin hole. The pins fix the transverse web members on the two adjacent main limbs together. The connecting rod is a telescopic rod.

4. A special section for correcting the verticality of a tower crane tower body according to claim 1, characterized in that: The upper end of the hydraulic cylinder is provided with a lower fixing block, the lower surface of which is fixed to the hydraulic cylinder. The lower end of the male connector is provided with an upper fixing block, which is fixed to the male connector. Between the lower and upper fixing blocks, there are several rhomboid frames arranged side by side. Each rhomboid frame consists of four connecting rods of the same length. The lower fixing block is provided with a lower rotating shaft, and the lower ends of the rhomboid frames are rotatably connected to the lower rotating shaft. The upper fixing block is provided with an upper rotating shaft, and the upper ends of the rhomboid frames are rotatably connected to the upper rotating shaft. Between the upper and lower rotating shafts, there are middle rotating shafts arranged side by side. The two ends of the middle section of each rhomboid frame are rotatably connected to two middle rotating shafts. Each of the two middle rotating shafts is provided with several rollers, which are fixed to the middle rotating shafts and located between adjacent rhomboid frames.

5. A special section for correcting the verticality of a tower crane tower body according to claim 4, characterized in that: Both sides of the mounting cavity are provided with threaded holes, and a clamping bolt is provided in the threaded hole. The clamping bolt is threadedly connected to the threaded hole. The end of the clamping bolt is provided with a push plate, which is rotatably connected to the clamping bolt, and the push plate is located between the roller and the side wall of the mounting cavity.

6. A special section for correcting the verticality of a tower crane tower body according to claim 5, characterized in that: Both ends of the push plate are provided with connecting ears, and each connecting ear is provided with a sliding rod. The two ends of the sliding rod are fixed to the side of the mounting cavity, and the connecting ears are slidably connected to the sliding rod.

7. A special section for correcting the verticality of a tower crane tower body according to claim 5, characterized in that: The upper end of the push plate is symmetrically provided with baffles, which are fixed on both sides of the male connector. The baffles are provided with threaded holes that match the lifting bolts. Both ends of the push plate are provided with fixing seats, which are used to fix the threaded sleeve to the inner wall of the mounting cavity.

8. A special section for correcting the verticality of a tower crane tower body according to claim 5, characterized in that: The push plate is equipped with a bearing, the outer ring of the bearing is fixed to the push plate, and the inner ring of the bearing is fixed to the clamping bolt.

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