Overhead dismounting and lengthening mounting method for tower crane boom of super high-rise building

Through the cooperation method of double tower cranes, the aerial dismantling and extension of the tower crane boom of super-high-rise buildings is solved, and the problems of extended construction period and increased costs in the existing technology are solved, achieving a fast and efficient construction process.

CN119461092APending Publication Date: 2025-02-18JIANGSU HUAJIAN CONSTR
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Patent Information

Application Number
CN202411820392.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-02-18

AI Technical Summary

Technical Problem

In the construction of super high-rise buildings, the prior art requires the removal of the tower body or the extension of the boom when the tower is demolished, resulting in an extended construction period and an increase in costs.

Method used

The cooperative method of double tower cranes is adopted to adjust the height of the tower crane crane boom and fix the direction of the tower crane, aerial disassembly and lengthen the crane boom, avoiding the removal and reinstallation of the tower body.

Benefits of technology

This method quickly and efficiently completes the disassembly and lengthening of the boom without removing the tower body, saving construction period, reducing machinery rental and labor costs, and reducing overall construction costs.

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Abstract

The invention discloses a method for dismounting, lengthening and mounting tower crane booms of a super high-rise building in the air. The method comprises the following steps: adjusting the heights of two tower crane booms; fixing the direction of the tower crane; disassembling the main hook and the counterweight, and recovering the host steel wire rope; hoisting by a tower crane boom; the tower cap is tightened in the direction of the cargo boom; the cargo boom is dismantled; splicing and lengthening the cargo boom; mounting the cargo boom in the air, detecting and the like. According to the method, the tower body is not dismantled, the tower crane dismantling process is reduced, the construction period can be shortened, mechanical lease and labor cost are saved, the overall construction cost is remarkably reduced, meanwhile, damage of wind power to the cargo boom and a building is avoided by tying wind cables at the front end and the rear end of the cargo boom and conducting wind vibration swing traction, and the construction efficiency is improved. And the position of the cargo boom is adjusted through the precise hand-drive block, so that the cargo boom is ensured to be accurately butted to the position of the slewing bearing.
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Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a method for aerial disassembly, extension and installation of a lifting arm of a tower crane for a super high-rise building. Background Art

[0002] Super high-rise buildings refer to buildings with more than 40 floors and a height of more than 100 meters. In the early stage of super high-rise building tower cranes, due to the influence of adjacent buildings, the length of the crane arm did not reach the optimal length during the initial installation due to the consideration of 360° rotation, as shown in the attached manual. Fig.11 In the later stage, as the height of the floors increases, the tower crane's boom exceeds the height of the adjacent buildings, and the boom has sufficient conditions to achieve 360° rotation to maximize the efficiency of the tower crane.

[0003] In the prior art, the boom of a tower crane usually needs to dismantle the tower body or extend the boom while the tower is dismantled, or the tower body needs to be reinstalled before the boom can be replaced or lengthened. In the presence of super-high-rise buildings, this will affect the construction period and increase machinery rental and labor costs, thereby increasing the overall construction cost. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for aerial disassembly, extension and installation of a tower crane arm for a super high-rise building, which can effectively solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is: a method for disassembling and extending the boom of a super high-rise building tower crane in the air, comprising the following steps: S1. Adjust the height of the tower crane's boom: There are two tower cranes on site. By coordinating the actions of the two cranes, accurate lifting and boom extension can be achieved, avoiding the load limitation faced by a single crane. Specifically, the first tower crane and the second tower crane are lowered by lowering the standard section of the inner tower body of the second tower crane to make the distance between the boom of the first tower crane and the boom of the second tower crane 18~26m, so as to ensure that the wire rope has enough force space and lifting angle.

[0006] S2. Fix the direction of the tower crane: After the second tower crane's boom is rotated to an angle of 58°~62° with the tower direction of the first tower crane, the second tower crane's slewing device is fixed and the second tower crane's boom is braked; S3. Dismantle the main hook, counterweight, and recover the main machine wire rope: The first tower crane lowers the main hook wire rope, then removes the main hook of the second tower crane and all the counterweights of the second tower crane, and recovers the main machine wire rope; S4. Lift the boom of the second tower crane: Use the first tower crane to lift the boom of the second tower crane (the boom of the first tower crane is 60m, with a total weight of 22.21t, and can lift 32t at a rotation radius of 40.38m. The boom of the second tower crane is 40m, with a total weight of 17.59t. The first tower crane is 37.2m away from the center of gravity of the boom of the second tower crane at 40m, and 32.7m away from the center of gravity of the boom of the 60m crane, so it can be safely disassembled and hoisted); S5. Tighten the tower cap toward the boom: Use the lifting mechanism of the first tower crane to pull the top of the tower cap of the second tower crane toward the boom of the second tower crane, then lower the boom tie rod of the second tower crane and remove the tie rod pin; S6. Dismantle the boom of the second tower crane: When dismantling the boom of the second tower crane, fix the sling and rope clamp between the part to be dismantled and the tower head; according to the imbalance (upward or downward), fix a tensioning device to maintain the stability of the boom. After the tensioning device is tightened, when the boom descends, untie the safety sling and operate the tensioning device, and slowly lift the dismantled boom to the ground through the first tower crane to complete the dismantling, so as to achieve direct dismantling in the air without dismantling the tower body; S7. Assemble and extend the boom of the second crane tower: Use a 25t truck crane to extend the boom on the ground. First, separate the third, fifth and eighth boom standard parts, and then install the fourth and sixth boom standard parts. The order of splicing and lengthening is: first section, second section, third section, fourth section, fifth section, sixth section, eighth section; S8. Find the center of gravity of the spliced ​​boom: After the boom of the second tower crane is extended to 60m, the boom of the second tower crane is first hoisted through the first tower crane according to the theoretical center of gravity position. The final balanced force lifting point position is determined through the trial hoisting, avoiding hoisting failure or damage caused by improper center of gravity; S9. Lifting the boom of the second tower crane: Even when the wind force is less than level 4, the wind resistance coefficient of the 60m long boom is still relatively large, and the resulting wind vibration amplitude can easily cause impact damage to the main body of the building and the glass curtain wall, and also damage the boom. After the successful trial lifting of the boom of the second tower crane and before the official lifting, a 320m long wind rope is tied to the front and rear ends of the boom of the second tower crane. During the lifting and rising process of the boom of the second tower crane, the rope at each end needs to be pulled to avoid wind damage to the boom and the building; S10. Use a manual hoist to accurately dock the boom of the second tower crane: The first tower crane hoists the boom of the second tower crane horizontally and slowly approaches the slewing bearing position of the second tower crane. To control the swing of the boom of the second tower crane, fasten the guy rope on the boom of the second tower crane to the structural steel beam of the building. When the pin eye of the boom of the second tower crane is not far enough from the pin eye of the slewing bearing (150~200mm), a 2t manual hoist can be used to fix one end on the boom of the second tower crane and the other end on the slewing bearing. Gently pull the hoist to adjust the position of the boom of the second tower crane and put the boom of the second tower crane in place. Then tighten the two pins of the boom of the second tower crane on the slewing bearing to ensure that the boom is accurately docked to the slewing bearing position; S11. After tensioning the tie rod, detach the sling of the first tower crane: Tighten the wire rope winding to retract the tie rod, and complete the tensioning of the tie rod by tilting the tower head diagonal support. Connect the tie rod and the pull plate with a pin shaft. After ensuring that the installation is correct, loosen the wire rope and detach the sling of the first tower crane; S12. Install the main hook, counterweight and main machine wire rope: Rotate the second tower crane 180°, and install the main hook, counterweight and main machine wire rope according to the 60m boom counterweight design requirements provided by the manufacturer; S13. Lifting, adding sections and testing - After the installation of the boom of the second tower crane is completed, the wire rope will be threaded and wound. After the wire rope is threaded and wound, it will be inspected and confirmed to be correct before debugging, lifting and adding sections. It can be used after passing the inspection, completing the installation of the boom of the second tower crane. The overall process quickly and efficiently completes the disassembly, extension and assembly of the boom, and accurately connects the tower crane with other equipment, which can effectively save construction time and improve construction efficiency.

[0007] Compared with the prior art, the present invention provides a method for aerial disassembly, extension and installation of a tower crane arm in a super high-rise building, which has the following beneficial effects: The method of the present invention provides a method of directly dismantling and installing an extension of the tower crane boom in the air without dismantling the tower body, which avoids the time delay and high cost caused by dismantling and reinstalling the tower body. The method uses a dual tower crane collaboration mode to make the wire rope force space and lifting angle more reasonable, and improves the safety and efficiency of lifting. By coordinating the actions of the two tower cranes, accurate lifting and boom extension can be achieved, avoiding the load limitation faced by a single tower crane. By tying wind ropes and wind swing traction at the front and rear ends of the boom, wind damage to the boom and buildings can be avoided, which is very important in high-altitude lifting. The position of the boom is adjusted by a precise manual hoist to ensure that the boom is accurately connected to the slewing bearing position. The present invention saves construction time, saves machinery rental and labor costs, and significantly reduces the overall construction cost by not dismantling the tower body and reducing the tower crane dismantling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1Schematic diagram for adjusting the height of the two tower crane booms.

[0009] Figure 2 This is a schematic diagram of the fixed tower crane direction.

[0010] Figure 3 Schematic diagram of disassembling the main hook, counterweight, and recovering the main machine wire rope.

[0011] Figure 4 Schematic diagram of using a nearby tower crane to lift the crane arm.

[0012] Figure 5 Schematic diagram of dismantling the crane arm and lifting it to the ground.

[0013] Figure 6 Schematic diagram of assembling and extending the crane arm.

[0014] Figure 7 Schematic diagram of lifting boom.

[0015] Figure 8 Schematic diagram of precise docking of the crane arm through a manual hoist.

[0016] Fig. 9 Schematic diagram of the M1200 tower crane sling being detached after the tensioning rod is tightened.

[0017] Fig.10 To install the main hook, counterweight and main machine wire rope.

[0018] Fig.11 Plan view before extending the tower crane arm DETAILED DESCRIPTION

[0019] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0020] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0021] In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0022] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] Reference Figure 1-10 The present invention provides a method for aerial disassembly, extension and installation of a tower crane arm of a super high-rise building, comprising the following steps: The first step is to adjust the height of the two tower crane booms - such as Figure 1 As shown: To ensure that the steel wire rope has enough force space and hoisting angle when the M1200 tower crane is hoisting the C7052 tower crane boom, the tower body of the C7052 tower crane needs to be lowered by two standard sections beforehand and pinned up with a safety pin. Before the tower is lowered, the distance between the two tower crane booms is about 10m, and after the two standard sections are lowered, the distance between the two tower crane booms is about 22m.

[0024] Step 2: Fix the direction of the tower crane - such as Figure 2 As shown: After the C7052 (25t) tower crane boom is turned to about 60 degrees with the M1200 tower body, the tower crane slewing device is fixed and the boom is braked; Step 3: Disassemble the main hook, counterweight, and recover the main machine wire rope. Figure 3 As shown: lower the main hook wire rope, then remove the main hook, and then remove all the counterweights of the C7052 tower crane and recycle the main machine wire rope; Step 4: Use the M1200 tower crane to lift the boom - such as Figure 4 As shown: Use M1200 tower crane to lift C7052 jib (under the condition of 60m jib, M1200 tower crane can lift 32t at the rotation radius of 40.38m. The total weight of 40m jib of C7052 tower crane is 17.59t, and the total weight of 60m jib is 22.21t. The M1200 tower crane is 37.2m away from the center of gravity of 40m jib of C7052 tower crane, and 32.7m away from the center of gravity of 60m jib, so it can be safely disassembled and hoisted. Step 5. Tighten the tower cap towards the boom - use the lifting mechanism to pull the top of the tower cap towards the boom, slowly lower the boom tie rod and remove the two tie rod pins; Step 6: Remove the crane arm - if Figure 5 As shown: When disassembling the boom, fix the sling and rope clamp between the part to be disassembled and the tower head. According to the imbalance (upward or downward), fix a tensioning device to maintain the stability of the boom. After the tensioning device is tightened, when the boom descends, untie the safety sling and operate the tensioning device, and slowly lift the disassembled boom to the ground through the M1200 tower crane; Step 7: Assemble and extend the crane arm - such as Figure 6 As shown: To extend the boom using a 25t truck crane on the ground, the third, fifth and eighth boom standard parts must be separated first, and then the fourth and sixth boom standard parts are installed, in the following order: first section, second section, third section, fourth section, fifth section, sixth section, eighth section; Step 8. Find the center of gravity of the crane arm. When the crane arm of the C7052 tower crane is extended to 60m, the crane arm of the C7052 tower crane is first hoisted by the M1200 tower crane according to the theoretical center of gravity position, and the final balanced force lifting point position is determined by the trial hoisting. Step 9: Lift the boom - Figure 7 As shown in the figure: Even when the wind force is less than level 4, the wind resistance coefficient of the 60m long crane arm is still large, and the resulting wind vibration amplitude can easily cause impact damage to the main body of the building and the glass curtain wall, and also cause damage to the crane arm. After the successful trial lifting of the 60m crane arm and before the formal lifting, a 320m long wind rope is tied to the front and rear ends of the crane arm. During the lifting process of the crane arm, at least 4 people are pulling the rope under each end.

[0025] Step 10: Use the manual hoist to accurately connect the crane arm - such as Figure 8 As shown: M1200 tower crane hoists the C7052 tower crane boom horizontally and slowly approaches the slewing bearing position. To control the swing of the boom, the guy rope on the boom is fastened to the structural steel beam of the building. When the pin of the C7052 tower crane boom is not far enough from the slewing bearing pin (150~200mm), a 2t manual hoist can be fixed on the boom at one end and on the slewing bearing at the other end. The hoist can be gently pulled to adjust the boom position and put the boom in place. Then the two pins of the C7052 boom are fastened to the slewing bearing.

[0026] Step 11: After tensioning the tie rod, detach the M1200 tower crane sling. Fig. 9 As shown: Gently tighten the wire rope winding to retract the pull rod, complete the tensioning of the pull rod by tilting the tower head diagonal support, connect the pull rod and the pull plate with a pin shaft, and after ensuring that the installation is correct, loosen the wire rope and detach from the M1200 tower crane sling.

[0027] Step 12: Install the main hook, counterweight and main machine wire rope - such as Fig.10 As shown: Rotate the C7052 tower crane 180º and install the main hook, counterweight and main machine wire rope according to the 60m boom counterweight design requirements provided by the manufacturer.

[0028] Step 13: Lifting, adding sections and testing - After the boom is installed, the wire rope is threaded and wound. After careful inspection and confirmation, debugging work, lifting and adding sections are carried out. The boom can only be used after passing the inspection by a qualified third-party testing agency.

[0029] Practice has proved that the adoption of the present invention can save construction time, dismantle adjacent tower cranes in advance, save machinery rental and labor costs, and the construction method is safe and fast.

[0030] As needed, the above-mentioned installation, setting, provision or connection methods include but are not limited to installation, setting or connection by screws, riveting, welding or socketing, fixing, etc., and the installation, setting or connection method is selected according to the needs of the working scenario.

[0031] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for disassembling and extending the boom of a tower crane in a super high-rise building in the air, characterized in that: The following steps are involved: S1. Adjust the height of the tower crane boom: Two tower cranes are set up on site, namely the first tower crane and the second tower crane. The distance between the boom of the first tower crane and the boom of the second tower crane is 18~26m by lowering the standard section of the inner tower body of the second tower crane; S2. Fix the direction of the tower crane: After the second tower crane's boom is rotated to an angle of 58°~62° with the tower direction of the first tower crane, the second tower crane's slewing device is fixed and the second tower crane's boom is braked; S3. Dismantle the main hook, counterweight, and recover the main crane wire rope: The first tower crane lowers the main hook wire rope, and then removes the main hook of the second tower crane and all the counterweights of the second tower crane; S4. Lift the boom of the second tower crane: lift the boom of the second tower crane with the first tower crane; S5. Tighten the tower cap toward the boom: Use the lifting mechanism of the first tower crane to pull the top of the tower cap of the second tower crane toward the boom of the second tower crane, then lower the boom tie rod of the second tower crane and remove the tie rod pin; S6. Dismantle the boom of the second tower crane: When dismantling the boom of the second tower crane, fix the sling and the rope clamp between the part to be dismantled and the tower head; S7. Assemble and extend the boom of the second crane tower: Use a 25t crane on the ground to lift the extended boom. First, separate the third, fifth and eighth sections of the boom standard parts, and then install the fourth and sixth sections of the boom standard parts. The order of splicing and lengthening is: first section, second section, third section, fourth section, fifth section, sixth section, eighth section; S8. Find the center of gravity of the spliced ​​boom: After the boom of the second tower crane is extended to 60m, the boom of the second tower crane is first hoisted by the first tower crane according to the theoretical center of gravity position, and the final balanced force lifting point position is determined by the trial hoisting; S9. Lifting the boom of the second tower crane: After the trial lifting of the boom of the second tower crane is successful and before the formal lifting, a guy rope is tied to the front and rear ends of the boom of the second tower crane. During the lifting and ascending process of the boom of the second tower crane, the lower part of each end rope needs to be pulled; S10. Use a manual hoist to precisely dock the boom of the second tower crane: the first tower crane hoists the boom of the second tower crane horizontally and slowly approaches the slewing bearing position of the second tower crane. In order to control the swing of the boom of the second tower crane, the guy rope on the boom of the second tower crane is fastened to the structural steel beam of the building. When the pin eye of the boom of the second tower crane is not close enough to the pin eye of the slewing bearing, a manual hoist weighing 2 tons is used, one end of the manual hoist is fixed on the boom of the second tower crane, and the other end of the manual hoist is fixed on the slewing bearing. The hoist is gently pulled to adjust the position of the boom of the second tower crane, and the boom of the second tower crane is put in place. Then the pin of the boom of the second tower crane is fastened to the slewing bearing. S11. After tensioning the tie rod, detach the sling of the first tower crane: Tighten the wire rope winding to retract the tie rod, and complete the tensioning of the tie rod by tilting the tower head diagonal support. Connect the tie rod and the pull plate with a pin shaft. After ensuring that the installation is correct, loosen the wire rope and detach the sling of the first tower crane; S12. Install the main hook, counterweight and main machine wire rope: rotate the second tower crane to match the first tower crane, and install the main hook, counterweight and main machine wire rope; S13. Lifting, adding sections, and testing - After the installation of the boom of the second tower crane is completed, the wire rope will be threaded and wound. After the wire rope is threaded and wound, it will be checked and confirmed to be correct before debugging, lifting and adding sections. After passing the inspection, it can be used to complete the installation of the boom of the second tower crane.

2. The method for aerial disassembly, extension and installation of a super high-rise tower crane boom according to claim 1 is characterized in that: The model of the first tower crane is M1200 tower crane, and the model of the second tower crane is C7052 tower crane.

3. The method for aerial disassembly, extension and installation of a super high-rise tower crane boom according to claim 1 is characterized in that: The distance between the boom of the first tower crane and the boom of the second tower crane is 22m.

4. The method for aerial disassembly, extension and installation of a tower crane arm for a super high-rise building according to claim 1 is characterized in that: The length of the wind rope in step S9 is 300-350m.