Large-span annular cantilever steel plate anti-deformation construction structure and method

Abstract

The invention discloses a large-span annular cantilever steel plate anti-deformation construction structure and method. The large-span annular cantilever steel plate anti-deformation construction structure comprises a lifting mechanism, a supporting mechanism and an embedded part, wherein the upper portion of the lifting mechanism is used for lifting a transfer room cantilever steel plate; the middle portion of the supporting mechanism is used for supporting the lifting mechanism; the lifting mechanism comprises a first steel box beam, a second steel box beam, a hanging beam and a connecting beam; the first steel box girder and the second steel box girder are arranged side by side and connected through a plurality of hanging beams and a plurality of connecting beams, the hanging beams are arranged at the lifting positions of the transfer room cantilever steel plates, and the connecting beams are arranged on the two sides of the hanging beams. A connecting steel plate is installed on the lower portion of the hanging beam, a plurality of hanging rods are installed on the connecting steel plate, and a transfer room overhanging steel plate is welded and fixed to the bottoms of the hanging rods. The supporting mechanism comprises a first supporting stand column used for supporting the first steel box girder and a second supporting stand column used for supporting the second steel box girder. The bottom of the supporting mechanism is installed on the embedded part. According to the scheme, construction is convenient, the construction precision and efficiency can be improved, and the construction risk is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a large-span annular cantilevered steel plate anti-deformation construction structure and method. Background Art

[0002] The reactor building of a nuclear power plant has a cantilever structure including the bottom plate, wall and top plate of the transfer room. The cantilever part of the transfer room is located above the reactor pit. The bottom of the cantilever structure is the steel component of the transfer room, which is tens of meters above the lower layer. Since the bottom of the transfer room is a steel component, it is easy to produce deflection and deformation.

[0003] The current construction method is to install the steel components of the transfer room in one go, tie the steel bars and pour concrete. This is not only time-consuming and labor-intensive, but also increases costs. It is difficult to meet the design requirements and construction accuracy and quality, and the safety risks of high-altitude construction are relatively high. Summary of the invention

[0004] The purpose of the present invention is to provide a large-span annular cantilever steel plate anti-deformation construction structure and method in view of the above problems.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A large-span annular cantilever steel plate anti-deformation construction structure, comprising an upper lifting mechanism for lifting the cantilever steel plate of the transfer chamber, a middle supporting mechanism for supporting the lifting mechanism, and a lower embedded part for connecting with a reinforced concrete casting body;

[0007] The lifting mechanism comprises a first steel box girder, a second steel box girder, a hanging beam and a connecting beam; the first steel box girder and the second steel box girder are arranged side by side, connected by a plurality of hanging beams and a plurality of connecting beams, a hanging beam is arranged at the lifting position of the cantilevered steel plate of the transfer chamber, and connecting beams are arranged on both sides of the hanging beam; a connecting steel plate is installed at the lower part of the hanging beam, a plurality of hanging rods are installed on the connecting steel plate, and the cantilevered steel plate of the transfer chamber is welded and fixed to the bottom of the hanging rod;

[0008] The support mechanism comprises a first support column for supporting the first steel box beam and a second support column for supporting the second steel box beam; the bottom of the support mechanism is installed on the embedded part.

[0009] It also includes an auxiliary construction exterior wall, the second support column has a different length from the first support column, the second support column is installed on the auxiliary construction exterior wall, and the second support column has the same top elevation as the first support column.

[0010] A wall side embedded part is arranged on the wall of the auxiliary construction outer wall on one side close to the cantilevered steel plate of the transfer room, and the middle part of the supporting column is reinforced by welding and fastening with a connecting rod and the wall side embedded part.

[0011] The supporting columns and connecting rods are all prefabricated structures in the workshop.

[0012] Adjacent hangers are connected by diagonal braces; both sides of the ends of the first steel box girder and the second steel box girder are connected and reinforced with supporting columns by diagonal braces.

[0013] The lifting transfer chamber cantilever steel plate is located on the left and right steel walls where the transfer chamber steel wall surrounding the transfer chamber steel platform intersects with the large-span annular cantilever steel plate anti-deformation construction structure on the vertical projection plane; the left and right steel walls are respectively the first transfer chamber steel wall and the second transfer chamber steel wall, and the lifting transfer chamber cantilever steel plates located on the first transfer chamber steel wall and the second transfer chamber steel wall are both between the first steel box girder and the second steel box girder.

[0014] The heights of the first transfer chamber steel wall and the second transfer chamber steel wall are the same or different; a cantilever structure is arranged between the first transfer chamber steel wall and the second transfer chamber steel wall, and the cantilever structure includes anchor nails and angle steel keels respectively arranged on the opposite surfaces of the first transfer chamber steel wall and the second transfer chamber steel wall, and the angle steel keels of the first transfer chamber steel wall and the second transfer chamber steel are welded and reinforced by connecting channel steel.

[0015] Stress monitoring points are set in the lifting mechanism, including monitoring points on the upper surfaces of the upper flanges of the first steel box girder and the second steel box girder, and monitoring points on the outer surface of the hanger; settlement observation points are set on the outer surface of the top steel wall of the transfer chamber.

[0016] A method for preventing deformation of a large-span annular cantilevered steel plate comprises the following steps:

[0017] Install the embedded parts connected to the reinforced concrete casting in advance at the designed position;

[0018] Lift the steel components of the transfer room as a whole to the lifting construction position;

[0019] Weld and install the supporting columns on the embedded parts;

[0020] Install the first steel box girder and the second steel box girder on the top of the supporting column;

[0021] Install a connecting beam between the first steel box beam and the second steel box beam, and install a hanging beam at the positioned lifting position, wherein a connecting steel plate is welded in advance at the bottom of the hanging beam;

[0022] Install fixed hangers on the connecting steel plate, and install diagonal braces between adjacent hangers;

[0023] The bottom of the boom is welded and fixed to the cantilevered steel plate of the transfer room;

[0024] Concrete is poured between the left and right steel walls where the cantilevered steel plate of the lifting and transfer room is located, and concrete is poured on the top plate of the upper part of the steel platform of the transfer room; the concrete is poured in layers and sections;

[0025] Remove the lifting device.

[0026] It also includes pre-setting the auxiliary construction outer wall, and when installing the support column, connecting the support column with the wall side embedded parts pre-embedded on the auxiliary construction outer wall by welding connecting rods. It also includes setting a cantilever structure between the steel walls of the transfer room at the lifting position of the cantilever steel plate of the transfer room.

[0027] The concrete is poured in layers and sections, and construction joints are provided between each layer and each section; when pouring in layers, pouring is carried out in batches, and the pouring thickness of each time shall not exceed 0.30m until one layer is poured; each construction joint contains a right-angle step structure, and the vertical side length of the step is ≥3cm to effectively block rays.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The construction structure of the present invention is designed with a lifting mechanism at the top for lifting the cantilevered steel plate of the transfer room, a supporting mechanism in the middle for supporting the lifting mechanism, and embedded parts at the bottom for connecting with the reinforced concrete casting body, so that the lifting device forms a stable structural system and provides reliable pulling for lifting the cantilevered steel plate of the transfer room.

[0030] Furthermore, the construction structure of the present invention can be designed on one side of the auxiliary construction outer wall, and the auxiliary construction outer wall can be used to realize the adaptability of the lifting device in different height environments, and the lifting device support structure is connected to the auxiliary construction outer wall to ensure the overall stability of the lifting device support structure at different heights. At the same time, the auxiliary construction outer wall can form more rooms and improve space utilization.

[0031] The present invention also arranges a cantilever structure between the steel walls of the transfer chamber, and its function is to provide a safe and reliable sealing and biological shielding space for the reactor refueling operation to ensure the personal safety of the operators; the cantilever structure realizes the connection between the transfer chamber and the lower core, and is used to transfer the fuel assemblies in the core to the outside of the core via the transfer chamber, and at the same time, a through hole penetrating the side wall is arranged on the side wall of the transfer chamber, and a gamma-ray detection device is arranged on the outside of the side wall to provide a device for measuring power distribution.

[0032] The construction structure of the present invention is easy to install, can improve construction quality, reduce construction risks, improve installation accuracy, meet the requirements of precise control, and can improve construction efficiency and shorten construction period.

[0033] The device in the construction structure of the present invention can not only meet the installation requirements of the large-span annular cantilevered steel plate, but also can be recycled repeatedly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic installation plane diagram of the large-span annular cantilever steel plate anti-deformation construction structure of the present invention.

[0035] Figure 2 It is a schematic cross-sectional view of the installation of the large-span annular cantilever steel plate anti-deformation construction structure of the present invention.

[0036] Figure 3 It is a front schematic diagram of the installation of the suspension rod in the present invention.

[0037] Figure 4 It is a side schematic diagram of the suspension rod installation in the present invention.

[0038] Figure 5 It is a top view schematic diagram of the connection structure between the lower side transfer chamber steel wall and the higher side transfer chamber steel wall in an embodiment of the present invention.

[0039] Figure 6 It is a schematic diagram of the installation connection between the steel platform of the transfer chamber and the lower side and higher side steel walls of the transfer chamber in an embodiment of the present invention.

[0040] Figure 7 Schematic diagram of layered concrete pouring in an embodiment of the present invention.

[0041] Figure 8 Schematic diagram of construction joint arrangement.

[0042] In the figure, 1. small embedded parts of floor slab; 2. large embedded parts of floor slab; 3. embedded parts on the side of wall; 4. supporting columns; 4-1. first supporting columns; 4-2. second supporting columns; 5. connecting rods; 6. first steel box girder; 7. diagonal braces; 8. second steel box girder; 9. hanging beams; 10. connecting beams; 11. connecting steel plates; 12. hanging rods; 13. bolts; 14. diagonal braces; 15. friction type high-strength bolts; 16. steel wall of lower side transfer room; 17. steel wall of higher side transfer room; 18. wall to be cast; 19. anchor nails; 20. angle steel keel; 21. connecting channel steel; 22. bottom plate of steel platform; 23. main beam of steel platform; 24. secondary beam of steel platform; 25. anchor nails of steel platform; 26. steel plate. DETAILED DESCRIPTION

[0043] The above contents of the present invention are further described in detail below in the form of embodiments, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the above contents of the present invention belong to the scope of the present invention.

[0044] In the description of the present invention, it is also necessary to explain:

[0045] The orientation or position relationship is based on the relationship shown in the drawings and is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0046] In addition, terms such as "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited in the present invention, those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0047] The present invention provides a large-span annular cantilever steel plate anti-deformation construction structure, such as Figure 1 , 2 As shown, it includes a lifting mechanism at the upper part for lifting the cantilevered steel plate of the transfer chamber, a supporting mechanism at the middle part for supporting the lifting mechanism, and an embedded part at the lower part for connecting with the reinforced concrete casting body;

[0048] The lifting mechanism includes a first steel box girder 6, a second steel box girder 8, a hanging beam 9 and a connecting beam 10; the first steel box girder 6 and the second steel box girder 8 are arranged side by side, and are connected by a plurality of hanging beams 9 and a plurality of connecting beams 10, the hanging beam 9 is arranged at the lifting position of the cantilevered steel plate of the transfer chamber, and the connecting beams 10 are arranged on both sides of the hanging beam 9; a connecting steel plate 11 is installed at the lower part of the hanging beam 9, and a plurality of hanging rods 12 are installed on the connecting steel plate 11, and the cantilevered steel plate of the transfer chamber is welded and fixed to the bottom of the hanging rod 12;

[0049] The supporting mechanism comprises a first supporting column 4 - 1 for supporting the first steel box girder 6 and a second supporting column 4 - 2 for supporting the second steel box girder 8 ; the bottom of the supporting mechanism is installed on the embedded part.

[0050] It also includes an auxiliary construction exterior wall. The second support column 4-2 has a different length from the first support column 4-1. The second support column 4-2 is installed on the auxiliary construction exterior wall. The second support column 4-2 has the same top elevation as the first support column 4-1.

[0051] A wall side embedded part 3 is arranged on the wall of the auxiliary construction outer wall on one side close to the cantilevered steel plate of the transfer room, and the middle part of the supporting column is reinforced by welding and fastening with a connecting rod 5 and the wall side embedded part 3.

[0052] The supporting columns 4 and the connecting rods 5 are all prefabricated structures in a workshop.

[0053] Adjacent hangers 12 are connected by diagonal braces 14; the ends of the first steel box girder 6 and the second steel box girder 8 are connected and reinforced with diagonal braces 7 on both sides and the supporting columns, the top of the diagonal brace 7 is welded to the bottom of the steel box girder, and the bottom of the diagonal brace 7 is welded to the supporting column.

[0054] The cantilever steel plate of the lifting transfer room is located on the left and right steel walls where the steel walls of the transfer room surrounding the steel platform of the transfer room intersect with the large-span annular cantilever steel plate anti-deformation construction structure on the vertical projection plane; the left and right steel walls are respectively the first transfer room steel wall and the second transfer room steel wall, and the cantilever steel plates of the lifting transfer room located on the first transfer room steel wall and the second transfer room steel wall are both between the first steel box girder 6 and the second steel box girder 8.

[0055] The heights of the first transfer room steel wall and the second transfer room steel wall are the same or different; when the heights are different, the left and right side steel walls are respectively the higher side transfer room steel plate and the lower side transfer room steel plate around the steel platform of the transfer room. Figure 6 As shown; a cantilever structure is arranged between the first transfer chamber steel wall and the second transfer chamber steel wall, and the cantilever structure includes anchor nails and angle steel keels respectively arranged on the opposite surfaces of the first transfer chamber steel wall and the second transfer chamber steel wall, and the angle steel keels of the first transfer chamber steel wall and the second transfer chamber steel are welded and reinforced by connecting channel steel.

[0056] A method for preventing deformation of a large-span annular cantilevered steel plate comprises the following steps:

[0057] Install the embedded parts connected to the reinforced concrete casting in advance at the designed position;

[0058] Lift the steel components of the transfer room as a whole to the lifting construction position;

[0059] Weld and install the supporting columns on the embedded parts;

[0060] Install the first steel box beam 6 and the second steel box beam 8 on the top of the supporting column;

[0061] A connecting beam 10 is installed between the first steel box beam 6 and the second steel box beam 8, and a hanging beam 9 is installed at the positioned lifting position, wherein a connecting steel plate 11 is welded in advance at the bottom of the hanging beam 9;

[0062] A fixed suspension rod 12 is installed on the connecting steel plate 11, and a diagonal brace rod 14 is installed between adjacent suspension rods 12;

[0063] The bottom of the suspension rod 12 is welded and fixed to the cantilevered steel plate of the transfer chamber;

[0064] Stress monitoring points are set on the pulling mechanism, including setting monitoring points on the upper surfaces of the upper flanges of the first steel box girder 6 and the second steel box girder 8, and setting monitoring points on the outer surfaces of the vertical poles of the hanger 12 structure.

[0065] In some embodiments, when the vibrating-wire strain gauge is installed on the surface of the steel structure, a welding mounting block is used, and an external monitoring system consisting of a computer and a data acquisition system (including a host and a measurement module) is connected to transmit the collected signal through a wireless network connection; automatic data collection is performed during the monitoring process, and automatic data collection and storage throughout the process can be achieved without intervals, so as to monitor in real time the load borne by the lifting device during the concrete pouring process of the cantilevered part of the transfer room.

[0066] A settlement observation point is set on the top outer surface of the transfer chamber steel wall 17 on the higher side of the cantilevered steel plate of the lifting transfer chamber to observe the deformation and settlement during the construction process so as to take corresponding control measures, such as reducing the concrete pouring speed or stopping the concrete pouring.

[0067] Concrete is poured between the left and right steel walls where the cantilevered steel plate of the lifting and transfer room is located, and concrete is poured on the top plate of the upper part of the steel platform of the transfer room; the concrete is poured in layers and sections;

[0068] When dismantling the lifting device, except for the cantilever structure between the steel walls of the transfer room and various embedded parts on the floor surface and wall sides, the rest of the structure of the lifting device needs to be dismantled.

[0069] In some embodiments, it also includes pre-setting an auxiliary construction outer wall, and when installing the support columns, the support columns are tied to the wall side embedded parts 3 pre-embedded in the auxiliary construction outer wall by welding connecting rods 5.

[0070] In some embodiments, a cantilever structure is provided between the steel walls of the transfer chamber at the lifting position of the cantilevered steel plate of the transfer chamber to provide a safe and reliable sealing and biological shielding space for the reactor refueling operation.

[0071] In some embodiments, when pouring is performed in layers and sections, construction joints are provided between each layer and between each section.

[0072] The layers are vertical and the sections are horizontal. When pouring in layers, pouring is carried out in batches, and the pouring thickness of each time shall not exceed 0.30m until one layer is poured. The layers can be set to about 2m, with no gaps within the layers and construction joints between the layers. Construction joints are also set between the sections. There is no specific section length requirement for the sections, as long as it is reasonable.

[0073] Each construction joint contains a right-angle step structure with a vertical side length of ≥3cm to effectively block radiation.

[0074] The construction joint is constructed by laying out a main keel formed of wood or steel pipes and setting up wire mesh to enclose a non-casting space, and forming a construction joint after the concrete is poured.

[0075] The present invention is further described in detail below in conjunction with specific embodiments:

[0076] A large-span annular cantilevered steel plate anti-deformation construction structure is used to lift the cantilevered steel plates on both sides of the transfer chamber. The device has an upper lifting mechanism, a middle two-side supporting mechanism and a lower embedded part.

[0077] The upper lifting mechanism for lifting the cantilevered steel plate is composed of a first steel box beam 6, a second steel box beam 8, a hanging beam 9, a connecting beam 10, a connecting steel plate 11, and a hanging rod 12. The hanging beam 9 is installed at the lifting position between the first steel box beam 6 and the second steel box beam 8, and the remaining positions are connected to form a whole with a connecting beam 10, such as Figure 3 , 4 As shown, a connecting steel plate 11 is installed at the lower part of the suspension beam 9, and a suspension rod 12 is fixed to the connecting steel plate 11 by bolts 13. There are at least two suspension rods 12 under each suspension beam 9, and two adjacent suspension rods 12 are connected by a diagonal brace 14. The bottom of the suspension rod 12 is welded and fixed to the cantilevered steel plate of the transfer chamber. The two welding and pulling positions in this embodiment have different heights, one belongs to the lower side transfer chamber steel wall 16, and the other belongs to the higher side transfer chamber steel wall 17. The lifting of steel walls at different heights can be achieved by using different lengths of suspension rods.

[0078] like Figure 6 As shown, there is a steel platform on the top of the lower side transfer chamber steel wall 16, and the steel platform is composed of a steel platform bottom plate 22, a steel platform main beam 23, a steel platform secondary beam 24, a steel platform anchor nail 25, and a steel plate 26. The steel platform bottom plate 22 is welded to the lower side transfer chamber steel wall 16 on all sides, and the two ends of the steel platform main beam 23 are welded to the higher side transfer chamber steel wall 17.

[0079] The middle part is a two-side support mechanism for supporting the first steel box girder 6 and the second steel box girder 8, which is composed of a support column 4 and a connecting rod 5. The top flange of the support column 4 is widened, and the support column 4 is connected to the first steel box girder 6 and the second steel box girder 8 by friction-type high-strength bolts 15;

[0080] The lower part is a plurality of embedded parts for connecting with the reinforced concrete casting body, including small embedded parts 1 of the floor slab and large embedded parts 2 of the floor slab, and the small embedded parts 1 of the floor slab and the large embedded parts 2 of the floor slab are embedded in the top of the floor slab;

[0081] In this embodiment, an auxiliary construction outer wall is provided, the second support column 4-2 is different in length from the first support column 4-1, the second support column 4-2 is installed on the auxiliary construction outer wall, and the top elevation of the second support column 4-2 is the same as that of the first support column 4-1. A wall side embedded part 3 is provided on the wall of the auxiliary construction outer wall close to the cantilevered steel plate of the transfer room, and the middle part of the support column is reinforced by welding with a connecting rod 5 and the wall side embedded part 3.

[0082] There are cantilevered parts on the lower side transfer chamber steel wall 16 and the higher side transfer chamber steel wall 17, and there is a bottom steel plate at the bottom between the cantilevered parts of the lower side transfer chamber steel wall 16 and the higher side transfer chamber steel wall 17. Figure 5 As shown, anchor nails 19 and angle steel keels 20 are welded on the surface of the steel wall on the side in contact with the wall 18 to be cast, and the angle steel keels 20 are welded and reinforced by connecting channel steels 21.

[0083] In this embodiment, the supporting steel column 4, the hanging beam 9, and the connecting beam 11 are made of H-shaped steel, the hanging rod 12 is in a "T" shape, and the connecting rod 5 is a seamless steel pipe.

[0084] In this embodiment, the deflection control requirement of the steel components of the transfer chamber during the concrete pouring process shall not exceed 10mm.

[0085] The construction method of this embodiment comprises the following steps:

[0086] Step 1: When constructing the floor slab, install the small embedded parts 1 and the large embedded parts 2 of the floor slab in advance; when constructing the wall, install the side embedded parts 3 of the wall in advance;

[0087] Step 2: prefabricate the steel components of the transfer chamber as a whole, including the lower side transfer chamber steel wall 16 and the upper side transfer chamber steel wall 17, the internal steel platform, and all related components;

[0088] Step 3: hoist the steel components of the transfer room as a whole;

[0089] Step 4: The whole module of the connecting rod 5 between the supporting columns 4 is prefabricated in the workshop;

[0090] Step 5: The prefabricated supporting column 4 module is welded and installed on the small embedded part 1 of the floor slab and the large embedded part 2 of the floor slab, and the connecting rod 5 is separately welded between the supporting column 4 and the embedded part 3 on the side of the wall for tensioning;

[0091] Step 6: Install the first steel box beam 6 on the top of the first supporting column 4-1, and install the second steel box beam 8 on the top of the second supporting column 4-2. The ends of the first steel box beam 6 and the second steel box beam 8 are respectively connected and reinforced with the supporting column 4 by using diagonal braces 7;

[0092] Step 7: Install the connecting beam 10 between the first steel box beam 6 and the second steel box beam 8, and install the hanging beam 9 after positioning, wherein the connecting steel plate 11 is welded to the bottom of the hanging beam 9 in advance;

[0093] Step 8: Use bolts 13 to install the fixed suspension rods 12 on the connecting steel plates 11, and install diagonal braces 14 between two adjacent suspension rods 12;

[0094] Step 9: The bottom of the suspension rod 12 is welded and fixed to the lower side transfer chamber steel wall 16 and the higher side transfer chamber steel wall 17;

[0095] Step 10: Layered and segmented concrete pouring, such as Figure 7 As shown; Specifically, the transfer chamber structure is partially cantilevered above the core, and a tie is required to prevent overturning and strictly control the concrete pouring speed and the single concrete pouring amount to prevent excessive deformation. Therefore, the concrete is poured in layers and sections. The first layer of concrete in the cantilevered part is poured for 1m, and the upper wall is poured after the concrete strength of this section reaches 100%;

[0096] Step 11. Dismantle the lifting device. Specifically, the lifting device needs to be dismantled on site after use. The dismantling procedure is the opposite of the installation sequence. Except for the cantilever structure between the steel walls of the transfer room, the embedded parts on the floor surface and the wall sides, the lifting device needs to be dismantled.

[0097] The solution of the present invention can be applied and implemented in the construction of multiple plant buildings in a nuclear power plant, is easy to operate, improves work efficiency, ensures quality, and satisfies design requirements in terms of accuracy.

[0098] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. A large-span annular cantilever steel plate anti-deformation construction structure, characterized by: It includes a lifting mechanism at the upper part for lifting the cantilevered steel plate of the transfer room, a supporting mechanism at the middle part for supporting the lifting mechanism, and an embedded part at the lower part for connecting with the reinforced concrete casting body; The lifting mechanism comprises a first steel box girder, a second steel box girder, a hanging beam and a connecting beam; the first steel box girder and the second steel box girder are arranged side by side, connected by a plurality of hanging beams and a plurality of connecting beams, a hanging beam is arranged at the lifting position of the cantilevered steel plate of the transfer chamber, and connecting beams are arranged on both sides of the hanging beam; a connecting steel plate is installed at the lower part of the hanging beam, a plurality of hanging rods are installed on the connecting steel plate, and the cantilevered steel plate of the transfer chamber is welded and fixed to the bottom of the hanging rod; The support mechanism comprises a first support column for supporting the first steel box beam and a second support column for supporting the second steel box beam; the bottom of the support mechanism is installed on the embedded part.

2. The large-span annular cantilevered steel plate anti-deformation construction structure according to claim 1 is characterized in that: It also includes an auxiliary construction exterior wall, the second support column has a different length from the first support column, the second support column is installed on the auxiliary construction exterior wall, and the second support column has the same top elevation as the first support column.

3. The large-span annular cantilevered steel plate anti-deformation construction structure according to claim 2 is characterized by: A wall side embedded part is arranged on the wall of the auxiliary construction outer wall on one side close to the cantilevered steel plate of the transfer room, and the middle part of the supporting column is reinforced by welding and fastening with a connecting rod and the wall side embedded part; the supporting column and the connecting rod are both prefabricated structures in the workshop.

4. The large-span annular cantilevered steel plate anti-deformation construction structure according to claim 1 is characterized in that: Adjacent hangers are connected by diagonal braces; both sides of the ends of the first steel box girder and the second steel box girder are connected and reinforced with supporting columns by diagonal braces.

5. The large-span annular cantilevered steel plate anti-deformation construction structure according to claim 1 is characterized in that: The lifting transfer chamber cantilever steel plate is located on the left and right steel walls where the transfer chamber steel wall surrounding the transfer chamber steel platform intersects with the large-span annular cantilever steel plate anti-deformation construction structure on the vertical projection plane; the left and right steel walls are respectively the first transfer chamber steel wall and the second transfer chamber steel wall, and the lifting transfer chamber cantilever steel plates located on the first transfer chamber steel wall and the second transfer chamber steel wall are both between the first steel box girder and the second steel box girder.

6. The large-span annular cantilevered steel plate anti-deformation construction structure according to claim 1 is characterized by: The heights of the first transfer chamber steel wall and the second transfer chamber steel wall are the same or different; a cantilever structure is arranged between the first transfer chamber steel wall and the second transfer chamber steel wall, and the cantilever structure includes anchor nails and angle steel keels respectively arranged on the opposite surfaces of the first transfer chamber steel wall and the second transfer chamber steel wall, and the angle steel keels of the first transfer chamber steel wall and the second transfer chamber steel are welded and reinforced by connecting channel steel.

7. The large-span annular cantilevered steel plate anti-deformation construction structure according to claim 1 is characterized by: Stress monitoring points are set in the lifting mechanism, including monitoring points on the upper surfaces of the upper flanges of the first steel box girder and the second steel box girder, and monitoring points on the outer surface of the hanger; settlement observation points are set on the outer surface of the top steel wall of the transfer chamber.

8. The large-span annular cantilever steel plate anti-deformation construction structure and the large-span annular cantilever steel plate anti-deformation construction method according to claim 5 are characterized in that: The following steps are involved: Install the embedded parts connected to the reinforced concrete casting in advance at the designed position; Lift the steel components of the transfer room as a whole to the lifting construction position; Weld and install the supporting columns on the embedded parts; Install the first steel box girder and the second steel box girder on the top of the supporting column; Install a connecting beam between the first steel box beam and the second steel box beam, and install a hanging beam at the positioned lifting position, wherein a connecting steel plate is welded in advance at the bottom of the hanging beam; Install fixed hangers on the connecting steel plate, and install diagonal braces between adjacent hangers; The bottom of the boom is welded and fixed to the cantilevered steel plate of the transfer room; Concrete is poured between the left and right steel walls where the cantilevered steel plate of the lifting and transfer room is located, and concrete is poured on the top plate of the upper part of the steel platform of the transfer room; the concrete is poured in layers and sections; Remove the lifting device.

9. The method for preventing deformation of a large-span annular cantilevered steel plate according to claim 8 is characterized in that: It also includes pre-setting up an auxiliary construction exterior wall, and when installing supporting columns, connecting the supporting columns to the wall side embedded parts pre-embedded on the auxiliary construction exterior wall by welding connecting rods; it also includes setting up a cantilever structure between the steel walls of the transfer room at the lifting position of the cantilever steel plate of the transfer room.

10. The method for preventing deformation of a large-span annular cantilevered steel plate according to claim 8, characterized in that: The concrete is poured in layers and sections, and construction joints are provided between each layer and each section; when pouring in layers, pouring is carried out in batches, and the pouring thickness of each time shall not exceed 0.30m until one layer is poured; each construction joint contains a right-angle step structure, and the vertical side length of the step is ≥3cm to effectively block rays.

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