An operating platform and chimney cylinder wall turnover form construction method

Abstract

The application relates to the technical field of chimney cylinder wall construction, in particular to an operation platform and a chimney cylinder wall turnover form construction method, which comprises a center drum with a diameter of D1; a plurality of radial beams, one end of each radial beam being connected with the center drum, the plurality of radial beams being uniformly distributed along the circumferential circumference of the center drum, and one end of each radial beam being connected with a supporting steel pipe; a plurality of platform steel rings, each platform steel ring being connected with the radial beams and being arranged at the center of the center drum; a cable-stayed cable being connected between the radial beams and the center drum, one end of the cable-stayed cable being connected with the radial beams and the other end being connected with the center drum; and a plurality of platform plates, the platform plates being sequentially laid on the steel structure formed by the radial beams and the platform steel rings; wherein D1=D2 / X; D2 is the maximum diameter of the chimney cylinder wall; 20m<=D2<=32.5m; 2.375<=X<=2.714; the application has the effects of reducing the overall self-weight of the operation platform under the premise of shortening the beam length of the radial beams and guaranteeing the safe performance of the operation platform.

Description

Technical Field

[0001] This application relates to the field of chimney wall construction technology, and in particular to an operating platform and a chimney wall formwork construction method. Background Technology

[0002] A chimney consists of a ground foundation and multiple coaxial sections of cylindrical wall. It is a tall structure used to discharge high-temperature flue gas from industrial and domestic furnaces. In order to reduce the ground concentration of pollutants emitted from the chimney and to create a negative pressure between the top and bottom of the chimney, chimneys are usually built to a relatively high height.

[0003] To construct tall chimneys, existing related technologies disclose a chimney slipform platform construction method, including the following steps: installing an inner drum ring on the chimney cup; sequentially setting a first outer drum ring, a second outer drum ring, and a third outer drum ring on the outer side of the inner drum ring; installing radial beams; the radial beams are placed radially on the upper surfaces of the inner drum ring and the first, second, and third outer drum rings; the radial beams are connected to the inner drum ring, the first outer drum ring, the second outer drum ring, and the third outer drum ring by bolts; the radial beams consist of two channel steels; installing a hoist frame; the hoist frame is connected to the inner drum ring by bolts; laying wooden planks between the radial beams; setting hoist frame tie rods; installing a lifting frame; the inner surface of the channel steel of the radial beams is provided with a lifting frame; installing templates and screw tie rods for fixing the templates; installing inner and outer hangers; the lower part of the lifting frame is provided with inner and outer hangers; installing steel ring railings on the inner and outer platforms; fixing support rods to the chimney wall; and installing jacks on the radial beams.

[0004] Regarding the aforementioned technologies, since the radial beam relies on the central drum ring for stress on the side away from the chimney wall, in order to improve the structural stability between the central drum ring and the radial beam, the existing technology adds a three-layer drum ring structure outside the inner drum ring to form a reinforcing drum ring to reduce the deformation of the drum ring structure. However, when constructing for large-diameter chimney walls, the length of the radial beam needs to be increased accordingly. At this time, the reinforcing drum ring not only leads to an increase in material usage, but also increases the overall self-weight of the reinforcing drum ring, resulting in a longer torque exerted by the reinforcing drum ring on the radial beam, increasing the bending moment and deflection of the radial beam, and reducing the safety of the slipform platform. Summary of the Invention

[0005] In order to ensure the safety of the operating platform while reducing the overall material cost, this application provides an operating platform and a method for constructing a chimney wall formwork.

[0006] The operating platform and chimney wall formwork construction method provided in this application adopt the following technical solution:

[0007] Firstly, this application provides an operating platform.

[0008] An operating platform, including

[0009] The diameter of the center drum ring is set to D1;

[0010] Multiple radial beams, one end of which is connected to the central drum ring, the multiple radial beams are evenly distributed along the circumference of the central drum ring, and the extension line of the radial beam passes through the center of the central drum ring. The end of the radial beam away from the central drum ring is connected to the supporting steel pipe of the chimney wall.

[0011] Multiple platform steel rings of different diameters are provided, each of which is connected to the radial beam, and the multiple platform steel rings are arranged co-centered with the central drum ring.

[0012] Each of the radial beams and the central drum ring is connected by at least two inclined cables of different lengths, one end of which is connected to the radial beam and the other end of which is connected to the central drum ring;

[0013] Multiple platform plates are laid sequentially on the steel structure formed by the radial beam and the platform steel ring to form an operating platform;

[0014] Where D1 = D2 / X; D2 is the maximum diameter of the chimney wall; 20 meters ≤ D2 ≤ 32.5 meters; 2.375 ≤ X ≤ 2.714.

[0015] By adopting the above technical solution, the designed operating platform, through the central drum ring, radial beams, and inclined cables, facilitates the formation of a basic steel structure for building the platform plate. The platform steel ring enables the fixation of the positions of multiple radial beams and forms a unified load-bearing structure, reducing the impact of deformation of individual radial beams. The platform plate facilitates the formation of the operating platform, allowing construction personnel to stand or place construction materials. By limiting the dimensional relationship between the chimney wall diameter and the central drum ring, firstly, the size of the inner hole of the central drum ring can be increased, facilitating the erection and passage of the construction elevator shaft. Secondly, the height of the central drum ring can be shortened, reducing the overall weight of the operating platform to some extent. Finally, the length of the radial beams can be shortened, reducing the lever arm length of the radial beams due to the self-weight of the central drum ring, reducing the bending deformation of the radial beams, and thus reducing the tension of the inclined cables. Since the weight reduction of the multiple radial beams is greater than the weight increase after the central drum ring diameter is enlarged, the overall weight of the operating platform can be further reduced, reducing the overall material cost of the operating platform and ensuring the safety of the operating platform.

[0016] In one specific implementation scheme, the beam length of the radiating beam is set as L1, and the length of the radiating beam extending out of the chimney wall is set as L2, L1=(D2-D1) / 2+L2, where D1=D2 / X; 20 m≤D2≤32.5 m; 2.375≤X≤2.714, 1 m≤L2≤3 m.

[0017] By adopting the above technical solution, and through the relationship L1=(D2-D1) / 2+L2, where D1=D2 / X; 20 m≤D2≤32.5 m; 2.375≤X≤2.714, 1 m≤L2≤3 m, the dimensional relationship between the beam length L1 of the radial beam and the maximum diameter D2 of the chimney wall is further realized. This allows the beam length of the radial beam to be flexibly adjusted according to the actual maximum diameter of the chimney wall, reducing the overall weight of the operating platform while ensuring the safety performance of the operating platform.

[0018] In one specific implementation scheme, the central drum ring includes an inner drum ring, an outer drum ring, and multiple connecting rods;

[0019] The outer drum ring is concentrically fitted outside the inner drum ring, and the outer drum ring is connected to the radial beam;

[0020] The connecting rod is disposed between the inner drum ring and the outer drum ring, with one end of the connecting rod connected to the inner drum ring and the other end connected to the outer drum ring;

[0021] One end of the stay cable is connected to the radial beam, and the other end extends from bottom to top between the lower edges of the inner and outer drum rings and connects to the lower edge of the outer drum ring.

[0022] By adopting the above technical solution, based on the relationship: D1=D2 / X, the size of the central drum ring can be determined under the premise that the maximum diameter of the chimney wall is determined. After shaping and connecting the materials, an inner drum ring and an outer drum ring are made. Then, the inner drum ring and the outer drum ring are set in the same center. The connecting rod is set in the preset position between the inner drum ring and the outer drum ring and connected and fixed to form the central drum ring. The designed central drum ring can form a double drum ring structure through the inner drum ring and the outer drum ring. The connecting rod can realize the connection and fixation of the inner drum ring and the outer drum ring, thereby strengthening the central drum ring structure, improving the deformation resistance of the central drum ring, and improving the safety of the operating platform.

[0023] In one specific implementation, the inner drum ring has a diameter of D1, and the radial beam is rotatably connected to the outer drum ring.

[0024] By adopting the above technical solution, while ensuring the connection between the radial beam and the drum ring structure, the beam length of the radial beam can be further shortened to reduce the overall weight of the operating platform and shorten the lever arm length of the central drum ring structure acting on the radial beam.

[0025] In one specific implementation, the angle between the radial beam and the stay cable is between 30° and 65°, and the minimum distance from the connection point of the stay cable and the radial beam to the center of the central drum ring is greater than 1.25*D1.

[0026] By adopting the above technical solution, the designed stay cable, by controlling the included angle between the stay cable and the radial beam to be between 30° and 65°, can achieve a good balance between the size of the stay cable and the stress. By controlling the minimum distance from the connection point of the stay cable and the radial beam to the center of the central drum, the stress model of the inner stay cable, which serves as a safety reserve, can be made reasonable, thereby reducing the required size of the stay cable and further reducing the overall weight of the operating platform.

[0027] In one specific implementation, the radial beam and the central drum ring are hinged by a pin, and the pin is axially horizontal.

[0028] By adopting the above technical solution, the designed radial beam, which is hinged to the central drum ring by a pin, can reduce the potential safety risks caused by cracks at the connection between the radial beam and the central drum ring due to deformation during platform lifting or construction. In other words, it can improve the adaptability to loads, meet the requirements for safe use under certain deformation, and thus improve the load-bearing capacity of the operating platform.

[0029] Secondly, this application discloses a method for constructing a chimney wall formwork, including...

[0030] S1: Pour the ground foundation at the predetermined position of the chimney wall, then construct 1 or 2 sections of the chimney wall, control the maximum diameter of the chimney wall to D2, and then erect a full-span ground scaffold inside the chimney wall on the ground foundation.

[0031] S2: Based on the maximum diameter D2 of the chimney wall, a central drum ring with a diameter of D1 is constructed on a full-span scaffold using steel, and the central drum ring is set at the same center as the chimney wall.

[0032] S3: With the central drum ring as the installation center, determine the beam length L1 of the radial beam according to the maximum diameter D2 of the chimney wall and the diameter D1 of the central drum ring, so that one end of the radial beam is rotatably connected to the central drum ring, and the other end is connected to the support steel pipe of the chimney wall through the climbing system, and multiple radial beams are set along the circumference of the central drum ring.

[0033] S4: Fix multiple platform steel rings of different diameters onto the radial beams. The platform steel rings are set at the same center as the central drum ring. After structural reinforcement is carried out between the central drum ring and each radial beam by multiple inclined cables, multiple platform plates are laid in sequence to form an operating platform.

[0034] S5: Using the climbing system, the operating platform is moved from bottom to top by flipping the formwork until the chimney wall construction is completed.

[0035] By adopting the above technical solution, according to the planned location of the chimney, the ground foundation is poured with reinforced concrete in the corresponding area. After the ground foundation is cured, one or two sections of the chimney wall are constructed, controlling the maximum diameter of the chimney wall to be D2. Then, according to the planned positions of the central drum ring and radial beams, lines are marked on the ground foundation. Scaffolding is then erected according to the markings. Construction workers pre-cut materials of the corresponding size based on the maximum diameter D2 of the chimney wall, and pre-assemble a central drum ring with a diameter of D1 using steel. Construction workers use hoisting equipment to hoist the central drum ring to the installation position. Then, construction workers stand on the scaffolding and adjust the posture and elevation of the central drum ring so that it is concentric with the chimney wall. Then, based on the relationship between the maximum diameter D2 of the chimney wall and the diameter D1 of the central drum ring, the beam length L1 of the radial beam is determined. One end of the radial beam is rotatably connected to the central drum ring, and the other end is erected on the scaffolding. Multiple radial beams are then aligned along... After the circumferential arrangement of the central drum ring and the completion of all radial beams, multiple platform steel rings of different diameters are constructed using steel materials. These platform steel rings are then fixedly connected to the radial beams, with the central drum ring as the installation center. Multiple inclined cables reinforce the structure between the central drum ring and each radial beam. Finally, multiple platform plates are laid sequentially to form an operating platform. The operating platform is then moved upwards using a formwork-turning construction method, utilizing a lifting system, until the entire chimney wall is completed. This designed chimney wall formwork-turning construction method uses the central drum ring, radial beams, platform steel rings, inclined cables, and platform plates to construct an operating platform that can be raised as the chimney wall construction height increases. This platform, used for worker standing or material storage, is coordinated with the lifting system to complete the chimney wall construction via formwork-turning. This reduces the safety risks and high construction costs associated with reliance on scaffolding throughout the construction process and shortens the chimney wall construction cycle.

[0036] In a specific implementation scheme, in step S2, the diameter D1 of the central drum ring and the maximum diameter D2 of the chimney wall satisfy the following relationship: D1=D2 / X; where 20 m≤D2≤32.5 m; 2.375≤X≤2.714.

[0037] By adopting the above technical solution, the designed chimney wall construction method can, under the premise of ensuring structural stability, shorten the length of the radial beam by increasing the diameter of the central drum ring, thereby reducing the deformation of the radial beam and further reducing the overall weight of the operating platform, thus improving the safety of the operating platform.

[0038] In one specific implementation, step S2 includes:

[0039] S21: Based on the maximum diameter D2 of the chimney wall, and according to the formula: D1=D2 / X; where 20 m≤D2≤32.5 m; 2.375≤X≤2.714, determine the diameter D1 of the upper and lower connecting steel rings;

[0040] S22: The upper and lower connecting steel rings, which are set on the same axis, are connected and fixed by multiple vertical columns to form the inner drum ring;

[0041] S23: An outer drum ring is fixedly connected to the outside of the inner drum ring.

[0042] By adopting the above technical solution, the designed chimney wall formwork construction method, through the upper and lower connecting steel rings set at the same center and connected by multiple vertical columns to form a central drum ring structure, can improve the rigidity and deformation resistance of the central drum ring; and on the basis of satisfying the connection between the radial beam and the drum ring structure, the beam length of the radial beam can be further shortened to reduce the overall self-weight of the operating platform and shorten the lever arm length of the drum ring structure acting on the radial beam.

[0043] In a specific feasible implementation, step S6 is also included: system dismantling.

[0044] S61: Removal of template system and climbing system;

[0045] S62: The platform system is dismantled down to the remaining central drum ring, and the connecting steel ring is suspended by a stressed steel wire rope;

[0046] S63: Disassemble the central drum ring into horizontal sections and remove it from top to bottom, then transport it to the ground until only the connecting steel ring remains;

[0047] S64: Connect and fix the lower connecting steel ring to the elevator that passes through the lower connecting steel ring;

[0048] S65: The elevator is dismantled after the tensioned steel wire rope is relaxed by slow-starting the elevator.

[0049] S66: The elevator descends slowly to transport the lower platform steel ring to the ground.

[0050] By adopting the above technical solution, the designed chimney wall formwork construction method can utilize existing elevators used for material transportation to dismantle the lower connecting steel ring, thus reducing the amount of dismantling work compared to traditional dismantling methods.

[0051] In one specific implementation, step S3 includes:

[0052] S31: Determine the length L1 of the radial beam according to the following formula and hoist it: L1={(D2-D1) / 2}+L2, where, D1=D2 / X; 20m≤D2≤32.5m; 2.375≤X≤2.714, L2 is the length of the radial beam extending out of the chimney wall, 1m≤L2≤3m;

[0053] S32: Pin installation: The end of the radial beam located in the central drum ring is firmly connected to the central drum ring by a pin, and the other end of the radial beam is connected to the supporting steel pipe of the chimney wall through the climbing system, and the pin is set horizontally in the axial direction.

[0054] By adopting the above technical solution, the designed chimney wall formwork construction method achieves the rotational connection between the central drum ring and the radial beam through the pin shaft. Compared with the fixed connection between the central drum ring and the radial beam, it can reduce the cracking and deformation at the connection between the central drum ring and the radial beam caused by vibration or deformation of the radial beam during construction. This improves the adaptability of the operating platform to changes in load and thus enhances the safety of the platform system.

[0055] In one specific implementation scheme, in step S32, the pin is inserted simultaneously on both sides with the central drum ring as the center of symmetry.

[0056] By adopting the above technical solution, the designed chimney wall formwork construction method can achieve uniform stress distribution on the central drum ring during the installation process through symmetrical synchronous installation, thereby reducing the possibility of structural deformation caused by uneven stress distribution on the central drum ring during construction.

[0057] In summary, this application includes at least one of the following beneficial technical effects:

[0058] 1. The designed operating platform, through a central drum ring, radial beams, and stay cables, facilitates the formation of a basic framework structure for building the platform plate. The platform steel ring enables the positioning of multiple radial beams and forms a unified load-bearing structure, reducing the impact of deformation of individual radial beams. The platform plate facilitates the formation of a working platform, allowing construction personnel to stand or place construction materials. By limiting the dimensional relationship between the chimney wall diameter and the central drum ring, firstly, the size of the inner hole of the central drum ring can be increased to facilitate the erection and passage of the construction elevator shaft. Secondly, the height of the central drum ring can be shortened, reducing the overall weight of the operating platform to some extent. Finally, the length of the radial beams can be shortened, reducing the lever arm length of the radial beams due to the self-weight of the central drum ring, reducing the bending deformation of the radial beams, reducing the tension of the stay cables, and further reducing the overall weight of the operating platform, thus reducing the overall material cost of the operating platform and ensuring the safety of its use.

[0059] 2. The designed operating platform can form a double-layer drum ring structure through the inner and outer drum rings. The inner and outer drum rings can be connected and fixed through the connecting rod, thereby strengthening the central drum ring structure, improving the deformation resistance of the central drum ring, and improving the safety of the operating platform.

[0060] 3. The designed operating platform, by controlling the angle between the cable and the radial beam to be between 30° and 65°, can achieve a good balance between the size of the stay cable and the stress. By controlling the minimum distance from the connection point of the stay cable and the radial beam to the center of the central drum, the stress model of the inner stay cable, which serves as a safety reserve, can be made reasonable, thereby reducing the required size of the stay cable and further reducing the overall weight of the operating platform.

[0061] 4. The designed operating platform, through the radial beams hinged to the central drum ring via pins, can reduce the risk of cracks at the connection between the radial beams and the central drum ring caused by deformation during platform lifting or construction, thereby improving the adaptability to loads and meeting the requirements for safe use under certain deformation conditions, thus improving the load-bearing capacity of the operating platform. Attached Figure Description

[0062] Figure 1 This is a structural schematic diagram of a construction operation platform according to an embodiment of this application.

[0063] Figure 2 yes Figure 1 Top view after adding the transition platform.

[0064] Figure 3 This is a schematic diagram of the structure of the central drum ring in an embodiment of this application.

[0065] Figure 4 This is a schematic diagram of the usage status of a construction operation platform according to an embodiment of this application.

[0066] Figure 5 yes Figure 4 sectional view.

[0067] Explanation of reference numerals in the attached drawings: 01. Chimney wall; 02. Climbing system; 03. Formwork system; 04. Supporting steel pipe; 05. Elevator; 1. Central drum ring; 11. Inner drum ring; 12. Outer drum ring; 13. Connecting rod; 2. Radial beam; 3. Platform steel ring; 4. Stay cable; 5. Platform plate; 6. Transition platform. Detailed Implementation

[0068] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0069] This application discloses an operating platform and a method for constructing a chimney wall formwork.

[0070] Firstly, this application discloses an operating platform.

[0071] Example 1

[0072] Reference Figure 1 An operating platform includes a central drum ring 1, radial beams 2, platform steel rings 3, and cable stays 4. A chimney wall 01 is set on a ground foundation, and the central axis of the chimney wall 01 is vertically set. The maximum diameter of the chimney wall 01 is set to D2. The central drum ring 1 is co-centered with the chimney wall 01, and the diameter of the central drum ring 1 is D1. D1 and D2 satisfy the following relationship: D1=D2 / X; where 20 meters≤D2≤32.5 meters; 2.375≤X≤2.714.

[0073] Reference Figure 1 The number of radial beams 2 is multiple. One end of the radial beam 2 is connected to the central drum ring 1, and the other end is erected on the scaffold. The rotation axis of the radial beam 2 is set horizontally. Multiple radial beams 2 are evenly distributed around the circumference of the central drum ring 1, and the extension line of the radial beam 2 passes through the vertical axis where the center of the central drum ring 1 is located. The end of the radial beam 2 away from the central drum ring 1 is connected to the supporting steel pipe 04 of the chimney wall 01 through the lifting system. In this application, the number of radial beams 2 can be 38, 40, or 43, as long as it can reliably support the central drum ring 1 and can cooperate with the lifting system to lift the operating platform. In this embodiment, the number of radial beams 2 is 40.

[0074] Reference Figure 2 In order to connect multiple radial beams 2 to form a unified load-bearing structure and to ensure that the multiple radial beams 2 are on the same plane and that the relative positions of two adjacent radial beams 2 remain unchanged, the platform steel ring 3 is welded and fixed to the multiple radial beams 2. The platform steel ring 3 is set at the same center as the central drum ring 1, and the diameters of the multiple platform steel rings 3 are different. In this application, the number of platform steel rings 3 can be 2, 3, or 5. The platform steel rings 3 can be located above or below the radial beams 2. In this embodiment, the number of platform steel rings 3 is 3, and the platform steel rings 3 are welded to the lower part of the radial beams 2.

[0075] Reference Figure 1In order to form a triangular force-bearing structure between the central drum ring 1 and the radial beams 2, there are at least two diagonal cables 4 between the central drum ring 1 and each radial beam 2, and the cables are of different lengths. One end of the diagonal cable 4 is fixedly connected to the radial beam 2 by bolts, and the other end passes through the lower end of the central drum ring 1 and is fixedly connected to the upper edge of the central drum ring 1. In this application, the number of diagonal cables 4 connecting the central drum ring 1 and the radial beams 2 can be 2, 3, or 4. In this embodiment, for safety reasons, there are 4 diagonal cables 4 between the central drum ring 1 and each radial beam 2, and the connection positions of the 4 diagonal cables 4 to the radial beams 2 are distributed along the long side of the radial beams 2.

[0076] Reference Figure 1 In order to facilitate the formation of a platform for construction workers to work, multiple platform plates 5 are also included. The multiple platform plates 5 are laid sequentially on the steel structure formed by the radial beam 2 and the platform steel ring 3, and the platform plates 5 are connected and fixed to the radial beam 2 by bolts.

[0077] Reference Figure 2 Because the diameter of the central drum ring 1 is relatively large, the distance between the central drum ring 1 and the elevator 05 is relatively large. In order to facilitate the construction personnel to move from the elevator 05 to the platform plate 5, a transition platform 6 is bolted to the inner circumference of the central drum ring 1. The transition platform 6 has an elevator 05 hole for the elevator 05 to pass through, and the gap between the transition platform 6 and the elevator 05 is not less than 10 cm and not more than 30 cm. In order to further improve the structural stability of the transition platform 6, two diagonal braces are welded to the bottom wall of the transition platform 6. The two diagonal braces are arranged opposite each other, and the end of the diagonal brace away from the transition platform 6 is bolted to the central drum ring 1.

[0078] Example 2

[0079] Reference Figure 3 Based on Example 1, Example 2 discloses the structure of the central drum ring 1. The central drum ring 1 includes an inner drum ring 11, an outer drum ring 12, and multiple connecting rods 13. The outer drum ring 12 is centrally fitted outside the inner drum ring 11, and the heights of the outer drum ring 12 and the inner drum ring 11 are the same. The top walls of the outer drum ring 12 and the inner drum ring 11 are flush. The connecting rods 13 are disposed between the inner drum ring 11 and the outer drum ring 12, and one end of the connecting rod 13 is welded and fixed to the inner drum ring 11, and the other end is welded and fixed to the outer drum ring 12.

[0080] Reference Figure 3Both the inner drum ring 11 and the outer drum ring 12 include an upper connecting steel ring, a lower connecting steel ring, and multiple vertical columns. The upper connecting steel ring and the lower connecting steel ring are coaxially arranged, and the multiple vertical columns are distributed along the trajectory of the upper connecting steel ring. One end of the vertical column is welded and fixed to the upper connecting steel ring, and the other end is welded and fixed to the lower connecting steel ring. Furthermore, the connection point of the connecting rod 13 with the upper connecting steel ring or the lower connecting steel ring is located near the connection point of the vertical column with the upper connecting steel ring or the lower connecting steel ring.

[0081] Reference Figure 4 The radial beam 2 is connected to the upper connecting steel ring of the outer drum ring 12. One end of the cable 4 is bolted to the radial beam 2, and the other end extends from bottom to top between the lower connecting steel ring of the inner drum ring 11 and the lower connecting steel ring of the outer drum ring 12, and is bolted to the lower connecting steel ring of the outer drum ring 12. In order to further improve the strength of the drum ring structure, two middle connecting steel rings are set between the upper connecting steel ring and the lower connecting steel ring, and the middle connecting steel rings are welded to the vertical column. In order to further improve the connection strength of the connecting steel rings at the same horizontal position of the inner and outer drum rings 12, multiple reinforcing angle steels are welded between the connecting steel rings at the same horizontal position of the inner and outer drum rings.

[0082] Example 3

[0083] Reference Figure 4 The difference between this embodiment 3 and embodiment 2 is that, in order to further shorten the length of the radiating beam 2, D1 is set as the diameter of the inner drum ring 11, and the radiating beam 2 is connected to the upper connecting steel ring of the outer drum ring 12. The diameter of the outer drum ring 12 is D3 = D1 + N, where 0.6 meters ≤ N ≤ 1.2 meters.

[0084] Example 4

[0085] Reference Figure 5 In Example 4, based on Example 3, in order to reduce the possibility of the stay cable 4 exceeding the tensile limit while reducing the diameter of the stay cable 4, the included angle between the stay cable 4 and the radial beam 2 is between 30° and 65°, and the minimum distance from the connection point of the stay cable 4 and the radial beam 2 to the central axis of the central drum ring 1 is greater than 1.25 times the diameter D1 of the central drum ring 1.

[0086] Example 5

[0087] Reference Figure 5 In Example 5, based on Example 4, the upper connecting steel ring of the radiating beam 2 and the outer drum ring 12 can be hinged by a pin, fixed by welding, or fixed by bolts. In order to reduce the impact of vibration caused by the movement of construction personnel on the operating platform or the lifting of the operating platform on the strength of the connection between the radiating beam 2 and the central drum ring 1, the upper connecting steel ring of the radiating beam 2 and the outer drum ring 12 are hinged by a pin, and the pin is set horizontally in the axial direction.

[0088] Example 6

[0089] Reference Figure 5 In Example 6, based on Example 5, since the diameter of the chimney wall 01 gradually decreases from bottom to top, the length of the radial beam 2 extending out of the chimney wall 01 will gradually increase as the operating platform moves upward. To avoid the excessive outward extension of the radial beam 2 affecting the force balance of the operating platform, the beam length of the radial beam 2 is set as L1, and the length of the radial beam 2 extending out of the chimney wall 01 is set as L2. L1 and L2 satisfy the following relationship: L1=(D2-D3) / 2+L2, where D1=D2 / X; 20 m≤D2≤32.5 m; D3=D1+N, 0.6 m≤N≤1.2 m, 2.375≤X≤2.714, 1 m≤L2≤3 m.

[0090] The implementation principle of an operating platform according to an embodiment of this application is as follows: a ground foundation is poured with reinforced concrete at a preset position on the ground, and then a construction scaffold is erected in the area where the central drum ring 1 and the radial beam 2 are laid out. According to the diameter of the chimney wall 01 to be constructed, according to the relationship, L1=(D2-D3) / 2+L2, where D1=D2 / X; D3=D1+N, 0.6 m≤N≤1.2 m, 20 m≤D2≤32.5 m; 2.375≤X≤2.714, 1 m≤L2≤3 m; under the premise that the maximum diameter D2 of the chimney wall 01 is determined, the diameter D1 of the inner drum ring 11, the length L1 of the radial beam 2, and the length L2 of the radial beam 2 extending out of the chimney wall 01 can be determined. Then, the central drum ring 1 and the length of the radial beam 2 are pre-made according to the dimensions calculated by the relationship.

[0091] The prefabricated central drum ring 1 is then hoisted onto the scaffolding using lifting equipment. The position of the central drum ring 1 is adjusted according to the axis and elevation. After the central drum ring 1 is in place, the radial beam 2 is hoisted using lifting equipment. The end of the radial beam 2 closest to the central drum ring 1 is rotatably connected to the central drum ring 1 via a pin. The other end of the radial beam 2 is connected to the support steel pipe 04 on the chimney wall 01 through a lifting system, so that the elevation of the radial beam 2 corresponds to the elevation of the central drum ring 1. The installation of the radial beam 2 is carried out symmetrically.

[0092] After all the radial beams 2 are installed, multiple platform steel rings 3 are installed in sequence, and the platform steel rings 3 are welded to the radial beams 2. Then, the stay cables 4 are constructed. Each radial beam 2 and the central drum ring 1 are connected and reinforced by four stay cables 4. After all the stay cables 4 are constructed, multiple platform plates 5 are laid in sequence on the steel structure formed by multiple radial beams 2 and multiple platform steel rings 3. After all the platform plates 5 are laid, the operating platform is formed.

[0093] Secondly, this application discloses a method for constructing a chimney wall formwork, comprising the following construction steps:

[0094] S1: Pour the ground foundation at the preset position of the chimney wall 01, then carry out the construction of 1 or 2 sections of chimney wall 01, control the maximum diameter of chimney wall 01 to D2, and then erect a full-span ground scaffold inside the chimney wall 01 on the ground foundation.

[0095] S2: Based on the maximum diameter D2 of the chimney wall 01, a central drum ring 1 with a diameter of D1 is constructed on a full-span scaffold using steel. The central drum ring 1 is aligned with the chimney wall 01, and the diameter D1 of the central drum ring 1 and the maximum diameter D2 of the chimney wall 01 satisfy the following relationship: D1=D2 / X; where 20m≤D2≤32.5m; 2.375≤X≤2.714;

[0096] S21: Based on the maximum diameter D2 of the chimney wall 01, and according to the formula: D1=D2 / X; where 20m≤D2≤32.5m; 2.375≤X≤2.714, determine the diameter D1 of the upper and lower connecting steel rings;

[0097] S22: The upper and lower connecting steel rings, which are set on the same axis, are welded and fixed by multiple vertical columns to form an inner drum ring 11 with a diameter of D1;

[0098] S23: An outer drum ring 12 is fixedly connected to the outside of the inner drum ring 11 by multiple connecting rods 13 to form a central drum ring 1, wherein the diameter D3 of the outer drum ring 12 is D1+N, and 0.6m≤N≤1.2m;

[0099] S24: Weld quality inspection: Conduct weld quality inspection on the welded joint of the central drum ring 1 until the weld quality is qualified;

[0100] S3: Taking the central drum ring 1 as the installation center, determine the beam length L1 of the radial beam 2 according to the maximum diameter D2 of the chimney wall 01 and the diameter D1 of the central drum ring 1, so that one end of the radial beam 2 is rotatably connected to the central drum ring 1 through a pin, and the other end is connected to the support steel pipe 04 of the chimney wall 01 through the climbing system 02, and so that multiple radial beams 2 are set along the circumference of the central drum ring 1.

[0101] S31: Determine the length L1 of the radial beam 2 according to the following formula and hoist it: L1={(D2-D3) / 2}+L2, where, D1=D2 / X; 20m≤D2≤32.5m; D3=D1+N, 0.6m≤N≤1.2m, 2.375≤X≤2.714, L2 is the length of the radial beam 2 extending out of the chimney wall 01, 1m≤L2≤3m; when the length L2 of the radial beam 2 extending out of the chimney wall 01 is greater than 3m, the excess part will be cut off.

[0102] S32: Pin shaft installation: The radial beam 2 is firmly connected to the outer drum ring 12 at one end of the central drum ring 1 through a pin shaft. The other end of the radial beam 2 is connected to the support steel pipe 04 of the chimney wall 01 through the climbing system 02. The pin shaft is set horizontally in the axial direction, and the pin shaft is installed simultaneously on both sides with the central drum ring 1 as the center of symmetry.

[0103] S4: Multiple platform steel rings 3 of different diameters are welded and fixed to multiple radial beams 2 at the same center. The platform steel rings 3 and the central drum ring 1 are set at the same center, and the platform steel rings 3 are located below the radial beams 2. After the structure is reinforced by multiple inclined cables 4 between the central drum ring 1 and each radial beam 2, multiple platform plates 5 are laid in sequence to form an operating platform.

[0104] S41: Platform steel ring 3 installation: Based on the changes in the chimney wall 01 from bottom to top, the platform steel ring 3 diameter is set with uniform distribution as the premise, and it is not removed when the upward construction progress is less than half. Then, multiple platform steel rings 3 with different diameters are coaxially welded and fixed to the bottom of multiple radial beams 2 with the central drum ring 1 as the center.

[0105] S42: Connection of cable 4: Connect one end of cable 4 to the braided rope loop and the pin on the radial beam 2. The insertion length of the rope loop and the length of the rope loop shall not be less than 500 mm. The other end of cable 4 extends downward between the lower connecting steel pin of the inner drum ring 11 and the lower connecting steel ring of the outer drum ring 12, and connects with the lower connecting steel ring of the outer drum ring 12. The outer drum ring 12 is provided with a retaining tile corner protector at the rope wrapping point.

[0106] S43: Platform plate 5 laying: According to the radial spacing of the radial beam 2, multiple platform plates 5 are laid in sequence to form an operating platform. The gaps between two adjacent platform plates 5 are connected with nails. A guardrail is installed on the edge of the platform plate 5 near the inner wall of the chimney wall 01, and a safety net is hung on the guardrail.

[0107] S5: Using the climbing system 02, the operating platform is moved from bottom to top by flipping the formwork until the chimney wall 01 is completed;

[0108] S51: Pre-embedded support steel pipe 04: Multiple support steel pipes 04 are pre-inserted into the chimney wall 01. The support steel pipes 04 are spot-welded to the circumferential reinforcing bars in the chimney wall 01 and then concrete pouring is carried out. The support steel pipes 04 are set to extend beyond the current concrete layer height.

[0109] S52: Climbing system 02 installation: Fix the jack to the radial beam 2 and make the support steel pipe 04 pass through the center hole of the jack;

[0110] S53: Platform Climbing: The ball bearings inside the jack apply force to the supporting steel pipe 04, and the jack applies a reaction force to the radial beam 2, causing the radial beam 2 to rise, thereby realizing the climbing of the operating platform;

[0111] S53: Verticality correction of support steel pipe 04: After the operating platform is lifted, the verticality of support steel pipe 04 is checked. If support steel pipe 04 is tilted, support steel pipe 04 is corrected first, and then steel bars are used to diagonally reinforce support steel pipe 04 and the structural steel bars of chimney wall 01.

[0112] S54: Support steel pipe 04 splicing: First grind the butt weld of the two support steel pipes 04 smooth, and then weld them together by butt welding.

[0113] S55: Chimney wall 01 pouring construction: The current chimney wall 01 layer is poured using the formwork system 03 until the concrete solidifies and then the formwork system 03 is removed.

[0114] S56: Repeat steps S53-S55 until the chimney wall 01 construction is completed;

[0115] S6: System dismantling: The system dismantling process follows the principle of dismantling from the outside in, starting with small components and then large components, and breaking down large components into smaller components.

[0116] S61: Dismantle template system 03 and climbing system 02;

[0117] S611: Template System 03 Removal: The operator stands on the inner and outer scaffolds, first removes the tie bolts and waler reinforcement, and then removes the inner and outer templates. The operator stands on the inner and outer operating platforms and uses ropes to lift the removed walers, tie bolts, templates, etc. to the inner and outer operating platforms. The removed templates and all accessories are transported to the ground using elevator 05.

[0118] S612: Remove the external scaffolding and external safety netting;

[0119] S613: Remove internal hanging frames and internal safety nets:

[0120] S62: The platform system is dismantled down to the remaining central drum ring 1, and the connecting steel ring is suspended by a stressed steel wire rope;

[0121] S621: The outermost platform steel ring 3 was removed;

[0122] S622: Remove steel ring 3 from the remaining platforms;

[0123] S623: The central drum ring 1 is tightened by a combination of a tension steel wire rope and a chain hoist. One end of the tension steel wire rope is connected to the lifting lug of the pre-embedded part at the top of the chimney wall 01, and the other end is connected to the lower connecting steel ring.

[0124] S624: Removal of radial beam 2 and platform plate 5;

[0125] S63: Disassemble the central drum ring 1 into sections along the horizontal direction and remove it from top to bottom, then transport it to the ground until only the connecting steel ring remains;

[0126] S631: Remove the inner and outer upper connecting steel rings;

[0127] S632: Removal of vertical columns;

[0128] S64: Connect and fix the inner and outer lower connecting steel rings to the elevator 05 that passes through the lower connecting steel rings using steel wire ropes;

[0129] S65: Slow-start elevator 05 is dismantled after the stressed steel wire rope is relaxed;

[0130] S66: Elevator 05 slowly descends to transport the lower platform steel ring 3 to the ground.

[0131] Thirdly, this application discloses mechanical calculations for the construction of a chimney wall 01 with a maximum diameter D2 of 28.1 meters and a thickness H of 0.7 meters.

[0132] I. Operation Platform Data

[0133] 1.1 Data for the central drum ring 1: According to the formula D1=D2 / X, 2.375≤X≤2.714, taking X as 2.555, the diameter D1 of the inner drum ring 11 is 11 meters. According to the formula D3=D1+N, 0.6 meters≤N≤1.2 meters, taking N as 1 meter, the diameter D3 of the outer drum ring 12 is 12 meters, and the height of the drum ring is 4.5 meters. The upper connecting steel ring of the inner drum ring 11 uses [16a channel steel, the middle connecting steel ring uses [8 channel steel, and the lower connecting steel ring uses [16 channel steel, with a total of 38 vertical columns); the upper connecting steel ring of the outer drum ring 12 uses [20a channel steel, the middle connecting steel ring uses [8 channel steel, and the lower connecting steel ring uses [16 channel steel, with a total of 38 vertical columns.

[0134] 1.2 Data of Radial Beam 2: There are 40 radial beams in total. Each radial beam 2 is composed of two [18a] channel steels. The two channel steels are connected by M16 / 18, 8.8S grade high-strength bolts. According to the formula L1={(D2-D3) / 2}+L2, where D1=11 meters; D2=28.1 meters; D3=12 meters, and L2 is the length of the radial beam 2 extending out of the chimney wall 01. 1 meter≤L2≤3 meters, take L2=1.2 meters, and get L1 as 9.25 meters.

[0135] 1.3. Cable 4 data: A steel wire rope with a diameter of 19.5 mm is selected as cable 4. The radius of the first cable 4 is R1 = 7.5 m, the radius of the second cable 4 is R2 = 8.8 m, the radius of the third cable 4 is R3 = 10.2 m, and the radius of the fourth cable 4 is R4 = 11.6 m.

[0136] 1.4 Platform steel ring 3 data: Platform steel ring 3 is made of [14a channel steel, with three rings in total. The first ring has a radius of R1 = 8.5 meters, the second ring has a radius of R2 = 10.8 meters, and the third ring has a radius of R4 = 14.55 meters.

[0137] 1.5 Supporting steel pipe 04 data: 40 ∮48*3.5 steel pipes are used. Specific data is shown in the table below.

[0138] Serial Number Parameter name symbol unit numerical values Remark 1 high h m 2 2 cross-sectional area of ​​the pole A mm2 489 3 pole turning radius i mm 15.8 4 Moment of inertia I cm4 12.19 5 elastic modulus E <![CDATA[10 5 N / mm2]]> 2.06

[0139] II. Calculation Assumptions

[0140] 2.1 In the calculation of the central drum ring 1, it is assumed that its stiffness is infinitely large;

[0141] 2.2 The connection between the radial beam 2 and the connecting steel ring on the outer drum ring 12, and the connection between the radial beam 2 and the supporting steel pipe 04 are assumed to be hinged;

[0142] 2.3 The radial spatial structure of the operating platform is simplified into a planar truss beam structure;

[0143] 2.4 Assuming the entire operating platform is symmetrically arranged, horizontal displacement and horizontal force are not considered under vertical load;

[0144] 2.5 During construction, steel bars are transported by elevator 05. When elevator 05 is transported to the platform and stops to unload, the elevator 05 mainly bears the weight. Construction personnel are responsible for transferring the steel bars from elevator 05 to other work surfaces for dispersed stacking. No large concentrated load is generated, and the load is very small. Therefore, the asymmetry of the platform is not considered in the calculation.

[0145] III. Load Statistics

[0146] 3.1 Platform Weight Statistics Table;

[0147] Serial Number name Weight (t) Remark 01 Drum Circle 7.146 02 Radiating beam 17.17 03 steel ring 3.2 04 cable stay 1.65 Includes rope clips and hard links 05 Platform board 13.76 06 Internal and external scaffolding and footboards 9.4 07 Hydraulic lifting mechanism 1.8 08 Elevator platform bridge 1.98 Total of the above 54.974 09 Reinforcing steel bars and personnel weight on the platform 10.8 total 66.876

[0148] 3.2 Platform Load Statistics Table;

[0149]

[0150]

[0151] 3.3 Load Classification Table;

[0152] name symbol Calculation formula unit quantity Remark Dead load N1 ①+②+③+④+⑤+⑥+⑦ KN 549.8 Live load N2 ⑨ KN 105.4 Total load N General ①+②+③+④+⑤+⑥+⑦+⑧ KN 655

[0153] 4. Mechanical Calculations

[0154] 4.1 Calculation of the supporting force of a single radial beam 2:

[0155] Ra=Ntotal / 40=655 / 40=16.38KN=1.64t

[0156] 4.2 Calculation of tension in cable 4: Since the outermost cable 4 is subjected to force first, the radius R4 = 11.6 meters of the fourth cable 4 is used as the basis for the calculation of cable 4. According to the law of cosines, the angle φ between the radial beam 2 and the outermost cable 4 is 38.32°.

[0157] The maximum pressure that the upper platform steel ring 3 can withstand is: ND = Ra / tgφ = 16.38 / tg38.32° = 20.73kN

[0158] Tension in cable 4: F = Ra / sinφ = 16.38 / sin38.32° = 26.42kN

[0159] 4.3 Bending moment M of radial beam 2: Simplify the spatial structure to a planar structure, approximate the load as a line load, Ra=ql / 2, derive q=2Ra / l, where l=L1-L2-H, l is the length of the lever arm of the climbing system 02 acting on radial beam 2.

[0160] Maximum bending moment of radial beam 2:

[0161]

[0162] As can be seen from the above formula, the maximum bending moment of the radial beam 2 is proportional to the square of the length of the radial beam 2. Shortening the length of the radial beam 2 effectively reduces the bending moment of the radial beam 2.

[0163] V. Strength Check of Main Components

[0164] 5.1, Radial Beam 2

[0165] The maximum bending moment Mmax on radial beam 2 is 30.1 kN.m.

[0166] Minimum section modulus required for radial beam 2: W = Mmax / f = 30100 / 215 = 140 cm3

[0167] According to the "Steel Structure Design Manual" published by China Architecture & Building Press, [18a channel steel A = 25.69 cm², WX = 141 cm³].

[0168] Select two [18a channel steels] with A = 25.69 × 2 = 51.38 cm2 and WX = 141 × 2 = 282 cm3 > 140 cm3. Also, 282 ÷ 140 ≈ 2.01, which is greater than 1.4 times the safety factor, thus meeting the requirements.

[0169] Because σ=N / A*N=30100 / (2569×2)=5.86N / mm2<0.1f=21.5N / mm2

[0170] In the formula, N represents the number of channel steels.

[0171] This indicates that the axial force is very small, therefore the performance of the radial beam 2 meets the strength requirements.

[0172] 5.2, Cable 4

[0173] F'=[F]*K / α=26.42KN*6 / 0.82=193.30KN <F=235KN

[0174] In the formula,

[0175] [F]: Tension force F in the cable-stayed cable;

[0176] F: Total breaking force of the wire rope;

[0177] α: Conversion factor for wire rope, from the table: α = 0.82 kN;

[0178] K: The safety factor for the wire rope is taken as 6;

[0179] Consult the "Practical Hardware Handbook (7th Edition)"

[0180]

[0181] Therefore, the performance of cable 4 meets the specifications.

[0182] 5.3 Stability check of support steel pipe 04

[0183] 5.3.1 Bearing capacity of a single supporting steel pipe 04: [P]=0.7×30EI / K(L0+95)×2=0.7×30×2.06×12.19×104 / 2×(200+95)×2=40.48kN.

[0184] The number of support rods is 40. P = F / K2N0 = 655 / 40 = 16.375kN < 40.48kN; and 40.48 ÷ 16.375 ≈ 2.472, so the safety factor meets the requirements.

[0185] 5.3.2. According to the requirements of the national standard "Technical Specification for Sliding Formwork Engineering GB50113-2019":

[0186] The bearing capacity of the steel pipe support rod is calculated according to Po=(α / K)×(99.6-0.22L)(B.0.2).

[0187] Po = (0.8 / 2) × (99.6 - 0.22 × 200) = 22.24 kN > 16.375 kN; meets the requirements.

[0188] In the formula:

[0189] α: Working condition coefficient for the group of rods, 0.7-1.0;

[0190] K: Safety factor not less than 2.0;

[0191] L: When the support rod is inside the structure, take the distance (cm) from the lower clamp of the jack to the upper surface of the poured concrete.

[0192] Therefore, the load-bearing capacity of the supporting steel pipe 04 meets the specifications.

[0193] 5.3.3 Calculation of Jack Parameters and Quantity

[0194] (1) N_total = 66876 kg

[0195] (2)P1: The jacks are considered to be 2500kg based on 50% of the rated load, and 40 jacks are set in the calculation.

[0196] (3) Therefore, the load borne by each jack is N / P1=66876kg÷40=1671kg, which accounts for 1671kg÷2500kg=66.84% of the rated load of the jack;

[0197] Therefore, the performance of the 40 5t jacks meets the requirements of the usage specifications.

[0198] In summary, the arrangement of 40 radial beams 2, φ19.5 steel wire ropes for stay cables 4, 40 supporting steel pipes 04, and 40 5t jacks all meet the specifications.

[0199] Fourthly, this application discloses a comparison of the weight of the existing conventional drum ring system and the drum ring system of this application, taking the construction of a chimney wall 01 with a maximum diameter D2 of 28.1 meters and a thickness H of 0.7 meters as an example.

[0200] Based on the data disclosed in the third aspect of the embodiments of this application, the following table is obtained (only the distinguishing items are listed):

[0201]

[0202] As shown in the table above, under the same construction conditions, the operating platform disclosed in this application saves approximately 5 tons of steel compared to the operating platform in the prior art.

[0203] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An operating platform, characterized in that: include The diameter is set to D1 for the center drum ring (1); Multiple radial beams (2) are connected at one end to the central drum ring (1). The multiple radial beams (2) are evenly distributed along the circumference of the central drum ring (1), and the extension line of the radial beams (2) passes through the center of the central drum ring (1). The end of the radial beam (2) away from the central drum ring (1) is connected to the supporting steel pipe (04) of the chimney wall. Multiple platform steel rings (3) of different diameters are provided, each of which is connected to the radial beam (2), and the multiple platform steel rings (3) are arranged at the same center as the central drum ring (1); At least two inclined cables (4) of different lengths are connected between each of the radial beams (2) and the central drum ring (1). One end of the inclined cable (4) is connected to the radial beam (2) and the other end is connected to the central drum ring (1). Multiple platform plates (5) are laid sequentially on the steel structure formed by the radial beam (2) and the platform steel ring (3) to form an operating platform; Where, D1 = D2 / X; D2 is the maximum diameter of the chimney wall; 20 meters ≤ D2 ≤ 32.5 meters; 2.375 ≤ X ≤ 2.714; The central drum ring (1) includes an inner drum ring (11), an outer drum ring (12), and multiple connecting rods (13); The outer drum ring (12) is co-centered outside the inner drum ring (11), and the outer drum ring (12) is connected to the radial beam (2); The connecting rod (13) is disposed between the inner drum ring (11) and the outer drum ring (12), and one end of the connecting rod (13) is connected to the inner drum ring (11), and the other end is connected to the outer drum ring (12); One end of the cable (4) is connected to the radial beam (2), and the other end extends from bottom to top between the lower edges of the inner drum ring (11) and the outer drum ring (12) and is connected to the lower edge of the outer drum ring (12). The angle between the radial beam (2) and the cable (4) is between 30° and 65°, and the minimum distance from the connection point of the cable (4) and the radial beam (2) to the central axis of the central drum (1) is greater than 1.25*D1.

2. The operating platform according to claim 1, characterized in that: The radial beam (2) and the central drum ring (1) are hinged by a pin, and the pin is set horizontally in the axial direction.

3. A method for constructing a chimney wall formwork, characterized in that: Implemented using the operating platform as described in any one of claims 1-2, including S1: Pour the ground foundation at the predetermined position of the chimney wall, then construct 1 or 2 sections of the chimney wall, control the maximum diameter of the chimney wall to D2, and then erect a full-span ground scaffold inside the chimney wall on the ground foundation. S2: Based on the maximum diameter D2 of the chimney wall, a central drum ring (1) with a diameter of D1 is constructed on a full-span scaffold using steel, and the central drum ring (1) is set at the same center as the chimney wall; the diameter D1 of the central drum ring (1) and the maximum diameter D2 of the chimney wall satisfy the following relationship: D1=D2 / X; where, 20m≤D2≤32.5m; 2.375≤X≤2.714; Step S2 includes: S21: Based on the maximum diameter D2 of the chimney wall, and according to the formula: D1=D2 / X; where 20 m≤D2≤32.5 m; 2.375≤X≤2.714, determine the diameter D1 of the upper and lower connecting steel rings; S22: The upper and lower connecting steel rings set on the same axis are connected and fixed by multiple vertical columns to form the inner drum ring (11); S23: An outer drum ring (12) is fixedly connected to the outside of the inner drum ring (11); S3: Using the central drum ring (1) as the installation center, determine the beam length L1 of the radial beam (2) according to the maximum diameter D2 of the chimney wall and the diameter D1 of the central drum ring (1), so that one end of the radial beam (2) is rotatably connected to the central drum ring (1), and the other end is connected to the support steel pipe (04) of the chimney wall through the climbing system (02), and multiple radial beams (2) are set along the circumference of the central drum ring (1); S4: Fix multiple platform steel rings (3) of different diameters to the radial beam (2), wherein the platform steel rings (3) and the central drum ring (1) are set at the same center, and after the structure is reinforced by multiple inclined cables (4) between the central drum ring (1) and each radial beam (2), multiple platform plates (5) are laid in sequence to form an operating platform; S5: Using the climbing system (02), the operating platform is moved from bottom to top by flipping the formwork until the chimney wall construction is completed.

4. The chimney wall formwork construction method according to claim 3, characterized in that: It also includes step S6: system dismantling: S61: Dismantle the template system (03) and climbing system (02); S62: The platform system is dismantled down to the remaining central drum ring (1), and the connecting steel ring is suspended by a stressed steel wire rope; S63: Disassemble the central drum ring (1) in sections along the horizontal direction and remove it from top to bottom, then transport it to the ground until the remaining connecting steel ring is removed; S64: Connect and fix the lower connecting steel ring to the elevator (05) that passes through the lower connecting steel ring; S65: The elevator is dismantled after the tensioned steel wire rope is relaxed by slow-start elevator (05); S66: The elevator (05) slowly descends and transports the lower platform steel ring (3) to the ground.

5. The chimney wall formwork construction method according to claim 3, characterized in that: Step S3 includes: S31: Determine the length L1 of the radial beam (2) according to the formula and hoist it: L1={(D2-D1) / 2}+L2, where, D1=D2 / X; 20 m≤D2≤32.5 m; 2.375≤X≤2.714, L2 is the length of the radial beam (2) extending out of the chimney wall, 1 m≤L2≤3 m; S32: Pin installation: Connect one end of the radial beam (2) to the central drum ring (1) with a pin. Connect the other end of the radial beam (2) to the supporting steel pipe (04) of the chimney wall through the climbing system (02) and set the pin horizontally.

6. The chimney wall formwork construction method according to claim 5, characterized in that: In step S32, the pin is inserted simultaneously on both sides with the central drum ring (1) as the center of symmetry.

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