Sectional assembling and accumulative lifting method for steel flues

Abstract

The invention discloses a steel flue segment assembling and accumulative lifting method, which adopts a segment assembling and accumulative lifting mode, and completes the assembling and lifting fixing of all segments of a steel flue through the steps of platform and hardware preset preparation, segment assembling into segments, whole segment lifting fixing, segment assembling, lifting fixing and the like. An operation surface is relatively fixed, the high-altitude operation amount and the operation surface replacement frequency are reduced, simultaneous operation of multiple persons is supported, the construction efficiency and safety are improved, and it is ensured that a large number of steel flue installation construction tasks are completed within a short construction period; the device can effectively adapt to narrow space in the chimney, solves the problems that the operation space in the chimney is small, the hoisting capacity of a tower crane is insufficient and the site is limited, does not need large hoisting equipment, and is small in occupied area and flexible to operate.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a method for segmented assembly and cumulative lifting of steel flues. Background Technology

[0002] With the acceleration of urbanization and the advancement of "zero-waste city" construction, waste incineration power plants have become the core facilities for solid waste treatment. Their flue systems, as the last barrier to pollutant emissions, have undergone continuous structural optimization, upgrading from traditional reinforced concrete chimneys to sleeve-type steel inner cylinder chimneys. The segmented suspended steel inner cylinder technology has been widely used due to its advantages such as being mainly under tension, reducing steel consumption, and avoiding the risk of steel plate buckling.

[0003] However, existing steel flue construction methods have many problems: First, the working environment is limited. Steel flues are set inside the concrete chimney wall, resulting in limited installation and operation space. In addition, the tower crane model is small and the site is limited, making it impossible to use large lifting equipment. Second, there is a lot of high-altitude work, which poses a high safety risk. Scaffolding needs to be erected along the height of the chimney, resulting in a large investment in safety protection measures, frequent changes in the work surface, and low construction efficiency. Third, the construction period is short, and the amount of installation and welding is large. The construction of 6 steel flues with a total length of about 738m and a weld length of about 2337.67m need to be completed within 3 months, making the task arduous.

[0004] Therefore, there is an urgent need for a method for segmented assembly and cumulative lifting of steel flues that can adapt to confined environments, reduce high-altitude operations, and improve construction efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a method for segmented assembly and cumulative lifting of steel flues, thereby solving the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution:

[0006] A method for assembling and cumulatively lifting segmented steel flues, wherein the steel flue is composed of multiple segments, and each segment is composed of multiple sections; the method includes the following steps:

[0007] Pre-planning: Prepare a mobile platform and lifting device; set up a lifting platform at the top of the chimney; set up a multi-layer support platform inside the chimney and a lifting platform inside the chimney.

[0008] Segmented assembly: The first section of the first steel flue is transported to the chimney body via a mobile platform; the first section of the first steel flue is lifted to its first height via a lifting platform, leaving space for the next section to be assembled; the second section of the first steel flue is transported below the first section via a mobile platform, and then lifted to connect with the first section via a jacking device; welding and internal anti-corrosion work are performed at the connection between the first and second sections of the first steel flue; this process is repeated until all segments of the first steel flue are assembled.

[0009] First section lifting and fixing: The first section of the steel flue is lifted to the upper part of the chimney body through the lifting platform; the lifting platform reaches the support platform corresponding to the first section of the steel flue, and steel brackets are welded to the outside of the first section of the steel flue and connected and fixed to the support platform;

[0010] Segmented Assembly and Lifting Fixing: Following the segmented assembly steps described above, complete the assembly of the second segment of the steel flue; lift the second segment of the steel flue to connect with the first segment of the steel flue via the lifting platform; reach the support platform corresponding to the second segment of the steel flue via the lifting platform, weld steel brackets to the outside of the second segment of the steel flue, and connect and fix the steel brackets to the support platform; repeat this process until the assembly and lifting fixing of all segments of the steel flue are completed.

[0011] Optionally, the lifting platform includes a lifting frame, a lifting device, a lifting rope, and a lifting conversion beam; the lifting frame is installed on the concrete structure at the top of the chimney, the lifting device is installed on the lifting frame, and the lifting device is connected to the lifting conversion beam through the lifting rope; when lifting the steel flue, the lifting conversion beam is placed in the steel flue, and both ends of the lifting conversion beam are respectively connected and fixed to the side wall of the steel flue.

[0012] Optionally, the lifting platform further includes a guide frame for guiding the lifting rope.

[0013] Optionally, the pre-preparation steps also include setting up a welding operation platform in the chimney body, wherein the welding operation platform is reserved for transporting and lifting steel flues.

[0014] Optionally, the welding platform includes a first climbing frame, a second climbing frame, and a detachable shelf; the first climbing frame and the second climbing frame are arranged opposite to each other, allowing the mobile platform to move between the first climbing frame and the second climbing frame; the detachable shelf is erected between the first climbing frame and the second climbing frame.

[0015] Optionally, the method for welding the connection between the first section and the second section of the first segment of the steel flue includes welding multiple section brackets at the connection between the first section and the second section of the first segment of the steel flue, welding the remaining weld at the connection, and inspecting the weld.

[0016] Optionally, the mobile platform is provided with a welding positioning mechanism, which includes a support member, a first arc member, and a second arc member; the support member is disposed on the mobile platform, and the first arc member is mounted on the support member; the second arc member is detachably connected to the first arc member to form a ring structure; when the upper and lower sections of the steel flue are joined, the ring structure surrounds the connection between the upper and lower sections; both the second arc member and the first arc member are provided with section welding operation holes.

[0017] Optionally, the first height is the height of the next section of the steel flue + 0.8m.

[0018] Optionally, the preset preparation steps further include preparing an internal anti-corrosion work platform; in the segmented assembly step, the method for performing internal anti-corrosion work on the first and second sections of the first segment of the steel flue includes the following steps: lifting the assembled and welded first and second sections of the first segment of the steel flue using a lifting platform, and moving the internal anti-corrosion work platform below the first and second sections of the first segment of the steel flue; lowering the first and second sections of the first segment of the steel flue back onto the lifting device using a lifting platform for internal anti-corrosion work; lifting the assembled and welded first and second sections of the first segment of the steel flue using a lifting platform, and removing them from the internal anti-corrosion work platform.

[0019] Optionally, multiple steel flues can be installed in the chimney body using the segmented assembly and cumulative lifting method described above.

[0020] The beneficial effects of this invention are as follows: This invention adopts the method of "segmented assembly and cumulative lifting", the operating surface is relatively fixed, reducing the amount of high-altitude work and the frequency of changing the operating surface, supporting multiple people to work at the same time, improving construction efficiency and safety, and ensuring that a large number of steel flue installation tasks can be completed in a short period of time; and it can effectively adapt to the narrow space inside the chimney, solving the problems of small operating space inside the chimney, insufficient tower crane lifting capacity, and limited site, without the need for large lifting equipment, with a small footprint and flexible operation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the assembly and construction of the first and second sections of the first segment of the steel flue of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of the mobile platform of the present invention.

[0024] Figure 3 This is a schematic diagram of the steel flue of the present invention being assembled into sections.

[0025] Figure 4 This is a schematic diagram of the internal anti-corrosion operation of the present invention.

[0026] Figure 5 This is a schematic diagram of the lifting and fixing construction of the first section of the steel flue of the present invention.

[0027] Figure 6 This is a schematic diagram of the segmented assembly and lifting and fixing construction of the steel flue of the present invention.

[0028] Figure 7 This is a schematic diagram of the structure of multiple steel flues of the present invention.

[0029] Figure 8 This is a top view of the chimney body of the present invention.

[0030] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0033] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0034] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0035] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0036] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0037] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0038] like Figures 1 to 6 As shown, a method for segmented assembly and cumulative lifting of a steel flue is described. The steel flue 1 consists of multiple segments, each segment being composed of multiple sections; each section is 3m long and is processed into a semi-finished product at a processing plant before being transported to the site for assembly. This method employs a "segmented assembly and cumulative lifting" approach, specifically including the following steps:

[0039] S1. Preset Preparation:

[0040] Prepare a mobile platform 6 and a lifting device 7; set up a lifting platform 3 on the concrete structure at the top of the chimney 2; set up a multi-layer support platform 4 inside the chimney 2; set up a lifting platform 5 inside the chimney 2; and build a welding operation platform 8 inside the chimney 2.

[0041] The lifting platform 3 includes a lifting frame 31, a lifting device 32, a lifting rope 33, a lifting conversion beam 34, and a guide frame 35. The lifting frame 31 is mounted on the concrete structure at the top of the chimney body 2. The lifting frame 31 uses HW400×400×13×21 steel columns and 400×20×400×12 main crossbeams to transfer the load to the chimney body 2 through the concrete structure. The lifting device 32 is mounted on the lifting frame 31 and is connected to the lifting conversion beam 34 via the lifting rope 33. When it is necessary to lift the steel flue 1, the lifting conversion beam 34 is lowered into the steel flue 1, with both ends of the lifting conversion beam 34 connected and fixed to the side walls of the steel flue 1. The lifting device 32 employs a hydraulic lifter within the hydraulic lifting system, specifically a TLJ-600 type hydraulic lifter with a rated lifting capacity of 60 tons. It works in conjunction with a CPDY7-4D type hydraulic pump power system and a TSC40-4D type computer synchronous control system to achieve precise jacking of one section of the steel flue. The lifting rope 33 is prestressed concrete steel strand conforming to GB / T5224-2014 standard, with a diameter of 15.2mm and a tensile strength of 1860MPa. Because the hydraulic lifter requires a pre-existing long steel strand at its top during lifting or lowering, excessive pre-existing steel strand can significantly impact the operation of the steel strand during lifting or lowering, as well as the locking and unlocking of the hydraulic lifter's top and bottom anchors. Therefore, each hydraulic lifter is pre-set with a guide frame 35 to guide the traction lifting rope 33, facilitating the smooth removal of excess pre-existing steel strand. Excess steel strand can be freely guided backward and downward along the lifting platform 3.

[0042] The support platform 4 is made of concrete and is fixed layer by layer within the concrete chimney body 2. Supporting components are pre-embedded in the support platform 4 for connection and fixation to the steel brackets 11 welded to the outside of the steel flue 1.

[0043] The lifting platform 5 is used by construction personnel to reach the support platforms 4 on each floor to carry out welding and fixing of the steel brackets 11.

[0044] like Figure 3 As shown, the mobile platform 6 is an electric flatbed truck, 4m long, 2.25m wide, and 0.5m high, with a load capacity of 5t. Powered by a lithium battery, it has a full-load operating range of 2.2 hours and features wireless remote control and automatic obstacle avoidance. It is used for the horizontal transport of steel flue 1 sections. The mobile platform 6 is equipped with a welding positioning mechanism, which includes a support member 61, a first arc member 62, and a second arc member 63. The support member 61 is mounted on the mobile platform 6, and the first arc member 62 is installed on the support member 61. The second arc member 63 is detachably connected to the first arc member 62 to form a ring structure. When the upper and lower sections of the steel flue 1 are joined, the ring structure encircles the connection point. Both the second arc member 63 and the first arc member 62 have section welding operation holes 64.

[0045] The jacking device 7 uses mechanical jacks as its core equipment, which possess high-precision displacement control and stable load-bearing capacity. Driven by a matching hydraulic power system, it rotates the lead screw to achieve linear displacement in the vertical direction. During the inverted cumulative lifting construction of the steel flue, the mechanical jacks are symmetrically arranged along the bottom of the steel flue. Each jack is equipped with a displacement sensor and load monitoring device, and synchronized through a PLC control system to ensure that each flue section remains horizontal during the lifting process, effectively avoiding structural deformation caused by uneven stress. Construction personnel can precisely adjust the lifting rate and stroke of the jacks according to the weight of the flue section and the lifting height, efficiently completing the jacking operation of the steel flue sections while ensuring construction safety.

[0046] The welding platform 8 includes a first climbing frame 81, a second climbing frame 82, and a detachable standing layer 83. The first climbing frame 81 and the second climbing frame 82 are arranged opposite each other, and the distance between the first climbing frame 81 and the second climbing frame 82 allows space to be reserved in the welding platform 8 for the mobile platform 6 to transport the steel flue 1 in and out between the first climbing frame and the second climbing frame for assembly and lifting operations. The detachable standing layer 83 is erected between the first climbing frame 81 and the second climbing frame 82, and the height of the detachable standing layer 83 is set to be 1.1-1.2m away from the weld position to facilitate welding operations by construction personnel.

[0047] S2. Segmented assembly into sections:

[0048] like Figures 1 to 4 As shown, in step S21, the first section of the steel flue 1 is transported to the chimney body 2 via the mobile platform 6. Before the mobile platform 6 enters the chimney body 2, the detachable standing layer 83 on the welding operation platform 8 is removed; after the mobile platform 6 is in place, the detachable standing layer 83 is erected again to prepare for subsequent welding operations.

[0049] S22. The first section of the first segment of the steel flue 1 is lifted to the first height by lifting platform 3, leaving space for the next section to be assembled; the first height is the height of the next section of the steel flue 1 + 0.8m.

[0050] During the lifting of the first section of the first segment of steel flue 1, the lifting device 32 applies load in stages according to the design load: 20%, 40%, 60%, 70%, 80%, 90%, 95%, and 100%, until the first section of the first segment of steel flue 1 is lifted off the ground. After lifting approximately 1 meter, the process is paused, the lifting points are finely adjusted to level the flue, and it is left to stand for 0.5 hours. After checking for any abnormalities, the lifting continues to the predetermined position. In the subsequent assembly steps of each segment, the above lifting process is repeated for cumulative lifting.

[0051] S23. The second section of the first segment of the steel flue 1 is transported to the bottom of the first segment using the mobile platform 6, and the second section of the first segment of the steel flue 1 is lifted to the point of docking with the first segment using the lifting device 7.

[0052] After docking is completed, the second arc component 63 and the first arc component 62 in the welding positioning mechanism on the mobile platform 6 are connected to form a ring structure, which surrounds the connection between the upper and lower sections. At this time, the section welding operation hole 64 is also aligned with the connection to ensure the accuracy of subsequent welding operations.

[0053] S24. Perform welding and internal anti-corrosion work at the connection between the first section and the second section of the first segment of the steel flue 1.

[0054] Specifically, the welding process is as follows: First, multiple sections 12 are welded at the connection between the first and second sections of the first segment of the steel flue 1 through the section welding operation holes 64 in the welding positioning mechanism to achieve pre-fixation of the upper and lower sections. Then, the welding positioning mechanism is disassembled and the moving platform is moved out. The lifting device 7 lifts the upper and lower sections of the steel flue 1 and keeps them 0.8m above the ground to avoid forming a closed space and facilitate personnel access and operation. Next, the remaining welds at the connection are welded. After all welds are completed, the welds are inspected for defects.

[0055] After the weld flaw detection is qualified, the internal anti-corrosion work is carried out in a timely manner: Before the internal anti-corrosion work, the first section and the second section of the first segment of the assembled and welded steel flue 1 are first lifted to a suitable height using the lifting platform 3, so that the internal anti-corrosion work platform 9 can enter below the steel flue 1; after moving the internal anti-corrosion work platform 9 below the first section and the second section of the first segment of the steel flue 1, the first section and the second section of the first segment of the steel flue 1 are lowered back onto the lifting device 7 for support using the lifting platform 3, and then the internal anti-corrosion work is carried out; after the work is completed, the first section and the second section of the first segment of the assembled and welded steel flue 1 are lifted up using the lifting platform 3 and removed from the internal anti-corrosion work platform 9. Finally, the assembled steel flue 1 is lifted to the first height using the lifting platform 3, in preparation for the entry and assembly of the next section.

[0056] S25, and so on, until all sections of the first segment of the steel flue 1 are assembled.

[0057] S3, First stage lifting and fixing:

[0058] like Figure 5 As shown, the first section of the steel flue 1 is lifted to the preset installation position on the upper part of the chimney body 2 via the lifting platform 3. The lifting platform 5 then reaches the support platform 4 corresponding to the first section of the steel flue 1. Before welding the steel bracket 11, the planar position and verticality of the flue are checked to ensure that the bracket and the concrete support are tightly fitted and firmly welded. Then, the steel bracket 11 is welded to the outside of the first section of the steel flue 1 and connected and fixed to the support platform 4. Finally, the lifting transfer beam 34 is disassembled from the steel flue 1, and the load of the steel flue 1 is transferred to the concrete structure through the steel bracket 11. The lifting device 32 drives the lifting transfer beam 34 to descend in preparation for the assembly of the next section.

[0059] S4. Segmented assembly and lifting fixation:

[0060] like Figure 6 As shown, the second section of the steel flue 1 is assembled by following the segmented assembly steps. The second section of the steel flue 1 is then lifted by the lifting platform 3 to connect with the first section. The sections of the steel flue are connected by a socket joint, without welding. The lifting platform 5 reaches the support platform 4 corresponding to the second section of the steel flue 1. Steel brackets 11 are welded to the outside of the second section of the steel flue 1 and then connected and fixed to the support platform 4. This process is repeated until all sections of the steel flue 1 are assembled, lifted, and fixed. Finally, the lifting transfer beam 34 is disassembled from the steel flue 1, and the load of the steel flue 1 is transferred to the concrete structure through the steel brackets 11.

[0061] When each section of the steel flue 1 is raised to dock with the support platform 4, fine adjustments are made using the computer-controlled synchronous system of the lifting platform 3. Precise adjustments are also made between the steel flue 1 and the support platform 4 via a guide chain to ensure docking accuracy. During the lifting process, if a prolonged suspension in the air is required, the mechanical and hydraulic self-locking devices of the hydraulic lifter ensure safety, and the steel flue 1 is connected and secured to the concrete structure via the guide chain.

[0062] like Figure 7 and Figure 8 As shown, in this embodiment, multiple steel flues 1 need to be installed in the chimney body 2. The lifting platform 5 is located at the center of the chimney body 2, and the installation positions of the multiple steel flues 1 surround the outside of the lifting platform 5. Through the above-described segmented assembly and cumulative lifting method of the steel flues, each steel flue 1 is installed in the chimney body 2 one by one until all are completed.

[0063] The steel flue segment assembly and cumulative lifting method provided by this invention adopts the "segment assembly and cumulative lifting" approach, which keeps the operating surface relatively fixed, reduces the amount of high-altitude work and the frequency of operating surface changes, supports multiple people to work at the same time, improves construction efficiency and safety, and ensures that a large number of steel flue installation tasks can be completed in a short period of time. Moreover, it can effectively adapt to the narrow space inside the chimney, solve the problems of small operating space inside the chimney, insufficient tower crane lifting capacity, and limited site, eliminates the need for large lifting equipment, occupies a small area, and is flexible in operation.

[0064] Regarding the embodiments of the present invention, it should also be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. The scope of protection of the present invention should be determined by the scope of the claims. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for assembling and cumulatively lifting steel flues in segments, wherein the steel flue (1) is composed of multiple segments, and each segment is composed of multiple sections; characterized in that, Includes the following steps: Pre-set preparation: Set up a lifting platform (3) at the top of the chimney body (2); set up a multi-layer support platform (4) inside the chimney body (2); set up a lifting platform (5) in the chimney body (2); prepare a moving platform (6) and a lifting device (7); Sectional assembly: The first section of the first segment of the steel flue (1) is transported to the chimney body (2) via a mobile platform (6); the first section of the first segment of the steel flue (1) is lifted to the first height via a lifting platform (3), leaving space for the next segment to be assembled; the second section of the first segment of the steel flue (1) is transported to the bottom of the first section via a mobile platform (6), and the second section of the first segment of the steel flue (1) is lifted to the point of connection with the first section via a jacking device (7); the connection between the first and second sections of the first segment of the steel flue (1) is welded and internal anti-corrosion work is carried out; and so on, until all sections of the first segment of the steel flue (1) are assembled. First section lifting and fixing: The first section of the steel flue (1) is lifted to the upper part of the chimney body (2) by the lifting platform (3); the support platform (4) corresponding to the first section of the steel flue (1) is reached by the lifting platform (5); steel brackets (11) are welded on the outside of the first section of the steel flue (1) and the steel brackets (11) are connected and fixed to the support platform (4); Segmented assembly and lifting fixation: Following the segmented assembly steps described above, complete the assembly of the second segment of the steel flue (1); lift the second segment of the steel flue (1) to connect with the first segment of the steel flue (1) using the lifting platform (3); reach the support platform (4) corresponding to the second segment of the steel flue (1) using the lifting platform (5), weld steel brackets (11) on the outside of the second segment of the steel flue (1), and connect and fix the steel brackets (11) to the support platform (4); and so on, until the assembly and lifting fixation of all segments of the steel flue (1) are completed.

2. The method for segmented assembly and cumulative lifting of steel flue gas ducts according to claim 1, characterized in that, The lifting platform (3) includes a lifting frame (31), a lifting device (32), a lifting rope (33), and a lifting conversion beam (34); the lifting frame (31) is located at the top of the chimney body (2), the lifting device (32) is located on the lifting frame (31), and the lifting device (32) is connected to the lifting conversion beam (34) through the lifting rope (33); When lifting the steel flue (1), the lifting conversion beam (34) is placed in the steel flue (1), and the two ends of the lifting conversion beam (34) are respectively connected and fixed to the side wall of the steel flue (1).

3. The method for segmented assembly and cumulative lifting of steel flue gas ducts according to claim 2, characterized in that, The lifting platform (3) also includes a guide frame (35) for guiding and pulling the lifting rope (33).

4. The method for segmented assembly and cumulative lifting of steel flue gas ducts according to claim 1, characterized in that, The pre-preparation steps also include setting up a welding operation platform (8) in the chimney body (2), and reserving space for transporting and lifting the steel flue (1) in the welding operation platform (8).

5. The method for segmented assembly and cumulative lifting of steel flue gas ducts according to claim 3, characterized in that, The welding platform (8) includes a first climbing frame (81), a second climbing frame (82), and a detachable standing layer (83); the first climbing frame (81) and the second climbing frame (82) are arranged opposite to each other, allowing the mobile platform (6) to move between the first climbing frame (81) and the second climbing frame (82); the detachable standing layer (83) is erected between the first climbing frame (81) and the second climbing frame (82).

6. The method for segmented assembly and cumulative lifting of steel flue gas ducts according to claim 1, characterized in that, The method for welding the connection between the first section and the second section of the first segment of the steel flue (1) includes welding multiple section brackets (12) at the connection between the first section and the second section of the first segment of the steel flue (1), welding the remaining weld at the connection, and inspecting the weld.

7. The method for segmented assembly and cumulative lifting of steel flue gas ducts according to claim 5, characterized in that, The mobile platform (6) is provided with a welding positioning mechanism, which includes a support member (61), a first arc member (62), and a second arc member (63). The support member (61) is disposed on the mobile platform (6), and the first arc member (62) is installed on the support member (61). The second arc member (63) is detachably connected to the first arc member (62) to form a ring structure. When the upper and lower sections of the steel flue (1) are connected, the ring structure surrounds the connection between the upper and lower sections of the steel flue. Both the second arc member (63) and the first arc member (62) are provided with section welding operation holes (64).

8. The method for segmented assembly and cumulative lifting of steel flue gas ducts according to claim 1, characterized in that, The first height is the height of the next section of the steel flue (1) + 0.8m.

9. The method for segmented assembly and cumulative lifting of steel flue gas ducts according to claim 1, characterized in that, The pre-set preparation steps also include preparing an internal anti-corrosion work platform (9); the method for performing internal anti-corrosion work on the first section and the second section of the first segment of the steel flue (1) in the segment assembly step includes the following steps: lifting the first section and the second section of the first segment of the assembled and welded steel flue (1) by using a lifting platform (3), and moving the internal anti-corrosion work platform (9) below the first section and the second section of the first segment of the steel flue (1); lowering the first section and the second section of the first segment of the steel flue (1) back onto the lifting device (7) by using a lifting platform (3) to perform internal anti-corrosion work; lifting the first section and the second section of the first segment of the assembled and welded steel flue (1) by using a lifting platform (3), and moving them out of the internal anti-corrosion work platform (9).

10. The method for segmented assembly and cumulative lifting of steel flue gas ducts according to claim 1, characterized in that, Multiple steel flues (1) are installed in the chimney body (2) by means of the segmented assembly and cumulative lifting method of steel flues as described in any one of claims 1 to 9.

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