Construction method of cantilever aluminum alloy roof

Abstract

The application discloses a construction method of a cantilever aluminum alloy roof, and the whole is lifted by a Bailey frame and an aluminum alloy net shell, so that the problem that the truss roof has limited bearing capacity and cannot be directly lifted by lifting equipment is solved; on the basis, the structure of the Bailey frame is optimized, and the connecting parts are all located on the upper side, so that when the inner side secondary framework of the tree-shaped support which will collide with the Bailey frame needs to be removed, the construction personnel only need to remove the steel frame on the aluminum alloy net shell which has been arranged, and an additional scaffold is not needed, so that the construction steps and procedures are simplified, a large amount of construction period is saved, and the construction risk is reduced.

Description

Technical Field

[0001] This invention belongs to the field of steel structure construction, and specifically relates to a construction method for a cantilevered aluminum alloy roof. Background Technology

[0002] Cantilevered roofs are a common structural design in steel structure buildings. The structure consists of a flat grid roof at the top and tree-shaped supports at the bottom of the grid. The perimeter of the grid roof extends beyond the tree-shaped supports to form a cantilevered shape.

[0003] During construction, the structural form of the roof is often limited, and its load-bearing capacity is limited. It cannot be lifted directly by lifting equipment, as direct lifting will cause deformation. Therefore, special construction methods are required. For this reason, patent CN113756501B discloses a construction method for cantilevered aluminum alloy roofs, which lifts the roof by setting Bailey bridges at the bottom of the grid roof for support.

[0004] However, in practice, the Bailey bridge and the grid roof are lifted together before the tree-shaped supports are installed. Due to the presence of the tree-shaped supports, the Bailey bridge needs to be dismantled in sections. Since the top of the conventional Bailey bridge needs to support the grid roof, the connections are mostly set on the sides and bottom. Dismantling requires scaffolding to be erected for high-altitude operations, which results in a long construction period and construction safety issues. Summary of the Invention

[0005] This invention provides a construction method for cantilevered aluminum alloy roofs to solve the technical problems of the Bailey scaffolding needing to be dismantled in sections due to the presence of tree-shaped supports. Conventional Bailey scaffolding requires the top to support the grid roof, so the connections are mostly set on the sides and bottom. Dismantling requires scaffolding to be erected for high-altitude operations, resulting in a long construction period and construction safety issues.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a construction method for a cantilevered aluminum alloy roof, comprising the following steps: S1. Erect a Bailey bridge on the existing floor. The Bailey bridge includes an outer main frame and an inner secondary frame. The inner secondary frame is detachably connected to the inner side of the outer main frame. The outer main frame is a rectangular ring. Several lifting connectors are fixedly welded to both ends of the outer main frame. An inner connector connected to the inner secondary frame is fixedly welded to the inner side of the outer main frame. The inner connector, the outer main frame, and the inner secondary frame are rectangular steel pipes of the same size. Vertical butt plates are fixed to the sides of the inner secondary frame and the inner connector, which are close to each other. The butt plates are connected by bolts. The sides of the inner secondary frame and the inner connector are also fixedly connected to the sides of the inner secondary frame and the inner connector. Horizontal connecting plates are set at the top of the two transition square tube seats. The connecting plates are connected to the transition square tube seats by bolts. Cross connectors are set at the intersection of the inner secondary frames. The cross connectors are connected to the inner secondary frames by butt plates and connecting plates. Lifting holes are opened on the inner secondary frames. S2. Assemble the aluminum alloy mesh shell on the Bailey bridge; S3. Install lifting equipment on both sides of the Bailey bridge; S4. Raise the Bailey bridge and aluminum alloy mesh shell as a whole to the design height; S5. Lay a crane operation platform on the existing floor, set up a truck crane on the crane operation platform, and use the truck crane to install tree-shaped supports at the bottom of the aluminum alloy mesh shell; S6. Install a steel frame on top of the aluminum alloy mesh shell, and install an electric hoist on the steel frame; S7. Use a crane to fix the Bailey frame through the lifting holes, and then remove the inner secondary frame that will collide with the tree support during the direct lowering process on the steel frame, while keeping the outer main frame that will not collide with the tree support during the direct lowering process, so that the inner secondary frame is completely separated from the outer main frame. S8. Use an electric hoist to lower the inner secondary frame to the existing floor one by one, ensuring that there is no contact between the inner Bailey frame and the tree-shaped support during the lowering process. S9. Then, using lifting equipment, the outer main frame is lowered to the existing floor level; S10. Remove the steel frame.

[0007] By adopting the above technical solution, the Bailey bridge and aluminum alloy grid shell are lifted as a whole, which solves the problem that the truss roof has limited load-bearing capacity and cannot be directly lifted by lifting equipment. On this basis, by optimizing the structure of the Bailey bridge, all the connecting parts are located at the top. Therefore, when it is necessary to dismantle the inner secondary frame of the Bailey bridge that would collide with the tree-shaped support, the construction workers only need to dismantle it on the steel frame on the already arranged aluminum alloy grid shell. There is no need to set up additional scaffolding, which simplifies the construction steps and procedures, saves a lot of construction time, and reduces construction risks.

[0008] Preferably, the connecting plates are angle steel, with one side fixed to the inner secondary frame or inner connecting seat by bolts, and the other side connected to each other by bolts.

[0009] By adopting the above technical solution, the structure has higher strength and the connection stability is more reliable.

[0010] Preferably, the connecting plate is a U-shaped plate with the opening facing upwards.

[0011] By adopting the above technical solution, it has better torsional resistance, high structural strength, and strong stability.

[0012] Preferably, in steps S1-4, the construction method for the Bailey bridge and aluminum alloy mesh shell includes the following steps: S21. Erect Bailey bridges on the top of the completed floor slab according to the marked positions to provide an operating platform and lifting support for the subsequent assembly and lifting of the aluminum alloy mesh shell. S22. Connect the suspension point conversion equipment to the Bailey bridge at the designed suspension point location, and ensure that the lower suspension point of the suspension point conversion equipment is outside the vertical projection range of the outer edge of the Bailey bridge. S23. The lifting equipment includes lifting cables, cable anchors, lifting point conversion equipment, support columns, lifting platforms, and hydraulic lifters. The lifting platform is installed on the support columns of the main structure next to the Bailey bridge, so that the upper lifting point of the lifting platform is vertically aligned with the lower lifting point of the corresponding lifting point conversion equipment. S24. Complete the assembly of the entire aluminum alloy mesh shell above the Bailey bridge and connect and fix the aluminum alloy mesh shell to the Bailey bridge. S25. Install a hydraulic lifter at the lifting point on the lifting platform, and install the lifting cable of the hydraulic lifter to the lifting point conversion equipment through the cable anchor. S26. The aluminum alloy mesh shell and Bailey bridge are lifted into place as a whole by hydraulic synchronous lifting equipment, and the aluminum alloy mesh shell is temporarily connected and fixed to the supporting column of the main structure on the side by limiting steel wire rope. S27. Install a support structure under the aluminum alloy mesh shell and connect and fix the aluminum alloy mesh shell to the support structure. After the connection and fixation, remove the limiting steel wire rope.

[0013] By adopting the above technical solutions, significant improvements can be achieved.

[0014] Preferably, the suspension point conversion device includes a vertically arranged attachment frame. A horizontally extending anchor frame is fixedly installed on the middle of one side of the attachment frame, and the anchor frame has an installation hole in its middle. Connecting lugs connected to the Bailey bridge frame are fixed at the top and bottom ends of the other side of the attachment frame. The attachment frame includes three spaced-apart I-beams. The webs of the three I-beams are connected at three points (top, middle, and bottom) by three square steel beams. The top and bottom ends of the two outer I-beams are fixed to the middle position of the central I-beam. There is a diagonally arranged reinforcing square tube, and four reinforcing square tubes form an X-shaped structure inside the attachment frame; the anchoring frame includes three I-beam crossbeams vertically welded to the middle of the flanges of three I-beam uprights. The web plates at the ends of the I-beam crossbeams are connected by an upward-opening U-shaped steel frame. The U-shaped steel frame is welded from three steel plates, and an installation hole is opened in the middle of the bottom horizontal plate. A reinforcing square steel is welded and fixed to the outer vertical plate, and the two ends of the reinforcing square steel are respectively welded and fixed to the web plates of the I-beam crossbeams on both sides.

[0015] By adopting the above technical solution, the connection structure is ingenious, easy to lift, and simple to operate.

[0016] Preferably, the lifting platform includes a vertically arranged extension pole, with a support beam for installing a hydraulic synchronous lifting device vertically fixed at the top of the extension pole on the side away from the supporting column, and a connecting beam vertically fixed at the middle and bottom on the side close to the supporting column. The connecting beam is fixedly installed on the supporting column by arc-shaped clamps, and two arc-shaped clamps are correspondingly sleeved on both sides of the supporting column and connected as one unit by high-strength bolts.

[0017] By adopting the above technical solutions, the structure is improved, the stability is enhanced, and the overall stability is improved.

[0018] Preferably, the hydraulic synchronous lifting equipment includes a hydraulic lifter installed on the lifting platform. The hydraulic lifter is vertically arranged, and its internal lifting steel cable passes through the lifting platform and the lifting point conversion device from top to bottom at the upper and lower lifting points. The lifting steel cable and the lifting point conversion device are connected as one unit by steel cable anchors.

[0019] Preferably, after the aluminum alloy mesh shell is raised to 140mm-160mm, the raising is paused and left to stand for 4-12 hours to monitor whether the deformation of the aluminum alloy mesh shell rod units matches the construction calculation. After confirming that there are no abnormalities, the formal raising can begin.

[0020] Preferably, when the outer ring Bailey bridge of S9 is lowered to a distance of 80mm-120mm from the aluminum alloy mesh shell, it is left to stand still for 3-5 hours, and the deformation of the aluminum alloy mesh shell is monitored using a total station.

[0021] Preferably, the steel frame is pre-welded from multiple steel sections, and the steel frame is horizontally erected on top of the aluminum alloy mesh shell and temporarily fixed by a connecting structure.

[0022] The beneficial effects of this invention are as follows: by lifting the Bailey bridge and the aluminum alloy mesh shell as a whole, the problem of the limited load-bearing capacity of the truss roof, which cannot be directly lifted by lifting equipment, is solved. On this basis, by optimizing the structure of the Bailey bridge, all the connecting parts are located at the top. Thus, when it is necessary to dismantle the inner secondary frame of the Bailey bridge that would collide with the tree-shaped support, the construction workers only need to dismantle it on the steel frame on the already arranged aluminum alloy mesh shell. There is no need to set up additional scaffolding, which simplifies the construction steps and procedures, saves a lot of construction time, and reduces construction risks.

[0023] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention; the main objects and other advantages of the invention may be realized and obtained by means of the embodiments particularly pointed out in the description. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is an overall view of the Bailey bridge according to an embodiment of the present invention; Figure 3 This is a connection diagram of the outer main frame and the inner secondary frame of an embodiment of the present invention; Figure 4 This is a connection diagram of the cross connector according to an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the improvement of an embodiment of the present invention; Figure 6 This is a construction drawing of the tree-shaped support according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the lifting device according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the lifting point conversion device according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the lifting platform in an embodiment of the present invention; Figure 10 This is a schematic diagram of the arc-shaped clamp according to an embodiment of the present invention.

[0025] Reference numerals: 1. Bailey bridge; 101. Outer main frame; 102. Inner secondary frame; 103. Inner connector; 104. Connecting plate; 105. Transition square tube seat; 106. Connecting plate; 107. Cross connector; 2. Aluminum alloy mesh shell; 3. Tree-shaped support; 4. Lifting equipment; 5. Lifting cable; 6. Cable anchor; 7. Lifting point conversion equipment; 71. Attachment frame; 72. Anchoring frame; 73. Connecting ear plate; 8. Support column; 9. Lifting platform; 91. Heightening pole; 92. Support beam; 93. Connecting beam; 94. Arc-shaped clamp; 95. High-strength bolt; 10. Hydraulic lifter. Detailed Implementation

[0026] The technical solutions of the present invention will be described in detail below through embodiments. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solutions of the present invention, and should not be construed as limiting the technical solutions of the present invention.

[0027] Combination Figure 1-10 A construction method for a cantilevered aluminum alloy roof includes the following steps: S1. A Bailey bridge truss 1 is erected on the existing floor. The Bailey bridge truss 1 includes an outer main frame 101 and an inner secondary frame 102. The inner secondary frame 102 is detachably connected to the inner side of the outer main frame 101. The outer main frame 101 is a rectangular ring. Several lifting connectors are fixedly welded to both ends of the outer side of the outer main frame 101. An inner connector 103 connected to the inner secondary frame 102 is fixedly welded to the inner side of the outer main frame 101. The inner connector 103, the outer main frame 101, and the inner secondary frame 102 are rectangular steel pipes of the same size. The inner secondary frame 102 and the inner connector 103 are separated at their adjacent ends. A vertically fixed butt plate 104 is fixedly attached to the inner secondary frame 102 and the inner connecting seat 103. The two connecting square tube seats 105 are fixedly connected to each other at their close ends. A horizontal connecting plate 106 is provided at the top of the two connecting square tube seats 105. The connecting plate 106 is connected to the connecting square tube seat 105 by bolts. A cross connecting seat 107 is provided at the intersection of the inner secondary frame 102 and the inner secondary frame 102. The cross connecting seat 107 is connected to the inner secondary frame 102 through the butt plate 104 and the connecting plate 106. Lifting holes are provided on the inner secondary frame 102. S2. Assemble the aluminum alloy mesh shell 2 on the Bailey bridge 1; S3. Lifting devices 4 are installed on both sides of Bailey bridge 1; S4. Raise the Bailey bridge 1 and the aluminum alloy mesh shell 2 as a whole to the design height; S5. Lay a crane operation platform on the existing floor, set up a truck crane on the crane operation platform, and use the truck crane to install tree-shaped support 3 at the bottom of the aluminum alloy mesh shell 2; S6. Install a steel frame on the top of the aluminum alloy mesh shell 2, and install an electric hoist on the steel frame; S7. Use a crane to fix the Bailey frame 1 through the lifting hole, and then remove the inner secondary frame 102 that will collide with the tree support 3 during the direct lowering process on the steel frame, while keeping the outer main frame 101 that will not collide with the tree support 3 during the direct lowering process, so that the inner secondary frame 102 is completely separated from the outer main frame 101. S8. Use an electric hoist to lower the inner secondary frame 102 one by one to the existing floor, ensuring that there is no contact between the inner Bailey frame 1 and the tree-shaped support 3 during the lowering process. S9. Then, using lifting equipment 4, the outer ring main frame 101 is lowered as a whole to the existing floor. S10. Remove the steel frame.

[0028] By lifting the Bailey bridge 1 and the aluminum alloy mesh shell 2 as a whole, the problem of the limited load-bearing capacity of the truss roof, which could not be directly lifted by the lifting equipment 4, was solved. On this basis, by optimizing the structure of the Bailey bridge 1, all the connecting parts are located at the top. Therefore, when it is necessary to dismantle the inner secondary frame 102 of the Bailey bridge 1 that would collide with the tree-shaped support 3, the construction workers only need to dismantle it on the steel frame on the already arranged aluminum alloy mesh shell 2. There is no need to set up additional scaffolding, which simplifies the construction steps and procedures, saves a lot of construction time, and reduces construction risks.

[0029] The connecting plate 104 is made of angle steel. One side is fixed to the inner secondary frame 102 or inner connecting seat 103 by bolts, and the other side is connected to each other by bolts. It has high structural strength and more reliable connection stability.

[0030] The connecting plate 106 can be a U-shaped plate with the opening facing upwards, which has better torsional resistance, high structural strength, and strong stability.

[0031] In steps S1-4, the construction method for the Bailey bridge 1 and the aluminum alloy mesh shell 2 includes the following steps: S21. Erect Bailey scaffold 1 on the top of the completed floor slab according to the marked position to provide an operating platform and lifting support for the subsequent assembly and lifting of the aluminum alloy mesh shell 2. S22. Connect the suspension point conversion device 7 to the Bailey bridge 1 at the designed suspension point location, and ensure that the lower suspension point of the suspension point conversion device 7 is outside the vertical projection range of the outer edge of the Bailey bridge 1. S23. The lifting equipment 4 includes a lifting cable 5, a cable anchor 6, a lifting point conversion device 7, a support column 8, a lifting platform 9, and a hydraulic lifter 10. The lifting platform 9 is installed on the support column 8 of the main structure next to the Bailey bridge 1, so that the upper lifting point of the lifting platform 9 is vertically aligned with the lower lifting point of the corresponding lifting point conversion device 7. S24. Complete the assembly of the entire aluminum alloy mesh shell 2 above the Bailey bridge 1, and connect and fix the aluminum alloy mesh shell 2 to the Bailey bridge 1. S25. Install a hydraulic lifter 10 at the lifting point on the lifting platform 9, and install the lifting steel cable 5 of the hydraulic lifter 10 onto the lifting point conversion device 7 through the steel cable anchor 6. S26. The aluminum alloy mesh shell 2 and Bailey frame 1 are lifted into place as a whole by the hydraulic synchronous lifting equipment 4, and the aluminum alloy mesh shell 2 is temporarily connected and fixed to the supporting column 8 of the main structure on the side by the limiting steel wire rope. S27. Install a support structure below the aluminum alloy mesh shell 2 and connect and fix the aluminum alloy mesh shell 2 to the support structure. After the connection and fixation are completed, remove the limiting steel wire rope to achieve better lifting.

[0032] The suspension point conversion device 7 includes a vertically arranged attachment frame 71. A horizontally extending anchor frame 72 is fixedly installed on the middle of one side of the attachment frame 71, and the anchor frame 72 has an installation hole in its middle. Connecting lugs 73, connected to the Bailey bridge 1, are fixed at the top and bottom ends of the other side of the anchor frame 71. The attachment frame 71 includes three spaced-apart I-beams. The webs of the three I-beams are connected at the top, middle, and bottom by three square steel beams. An inclined beam is fixed at the top and bottom ends of the two outer I-beams and at the middle position of the middle I-beam. The reinforced square tubes are arranged in an X-shape inside the attachment frame 71. The anchor frame 72 includes three I-beams vertically welded to the middle of the flanges of the three I-beams. The webs at the ends of the I-beams are connected by an upward-opening U-shaped steel frame. The U-shaped steel frame is welded from three steel plates. An installation hole is opened in the middle of the bottom horizontal plate. A reinforced square steel is welded and fixed to the outer vertical plate. The two ends of the reinforced square steel are welded and fixed to the webs of the I-beams on both sides. The connection structure is ingenious, easy to lift, and simple to operate.

[0033] The lifting platform 9 includes a vertically arranged extension pole 91. The top of the extension pole 91 is vertically fixed with a support beam 92 for installing a hydraulic synchronous lifting device 4 on the side away from the support column 8. The middle and bottom of the extension pole 91 are vertically fixed with connecting beams 93 on the side close to the support column 8. The connecting beams 93 are fixedly installed on the support column 8 by arc-shaped clamps 94. Two arc-shaped clamps 94 are correspondingly sleeved on both sides of the support column 8 and connected as one unit by high-strength bolts 95. The lifting structure is ingenious, has strong stability, and provides stable lifting.

[0034] The hydraulic synchronous lifting device 4 includes a hydraulic lifter 10 installed on the lifting platform 9. The hydraulic lifter 10 is vertically arranged, and the lifting steel cable 5 inside it passes through the lifting platform 9 and the lifting point conversion device 7 from top to bottom at the upper and lower lifting points. The lifting steel cable 5 and the lifting point conversion device 7 are connected as one unit by a steel cable anchor 6.

[0035] After the aluminum alloy mesh shell 2 is raised to 140mm-160mm, the lifting is paused and left to stand for 4-12 hours. The deformation of the rod unit of the aluminum alloy mesh shell 2 is monitored to see if it matches the construction calculation. After confirming that there are no abnormalities, the formal lifting can begin.

[0036] When the outer ring Bailey bridge 1 of S9 is lowered to a distance of 280mm-120mm from the aluminum alloy mesh shell, it is left to stand still for 3-5 hours. The deformation of the aluminum alloy mesh shell 2 is then monitored using a total station.

[0037] The steel frame is pre-welded from multiple steel sections and is horizontally erected on top of the aluminum alloy mesh shell 2 and temporarily fixed by a connecting structure.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A construction method for a cantilevered aluminum alloy roof, characterized in that: Includes the following steps, S1. Erect a Bailey bridge (1) on the existing floor. The Bailey bridge (1) includes an outer main frame (101) and an inner secondary frame (102). The inner secondary frame (102) is detachably connected to the inner side of the outer main frame (101). The outer main frame (101) is a rectangular ring. Several lifting connectors are fixedly welded to both ends of the outer side of the outer main frame (101). An inner connector (103) connected to the inner secondary frame (102) is fixedly welded to the inner side of the outer main frame (101). The side secondary frame (102) and the inner connecting seat (103) are respectively fixed with vertically oriented mating plates (104) at their close ends. The mating plates (104) are connected by bolts. The side secondary frame (102) and the inner connecting seat (103) are also fixedly connected with transition square tube seats (105) at their close ends. The top of the two transition square tube seats (105) is provided with horizontally oriented connecting plates (106). The connecting plates (106) are respectively connected to the transition square tube seats (105) by bolts. S2. Assemble the aluminum alloy mesh shell (2) on the Bailey frame (1); S3. Lifting devices (4) are installed on both sides of the Bailey bridge (1); S4. Raise the Bailey bridge (1) and aluminum alloy mesh shell (2) as a whole to the design height; S5. Lay a crane operation platform on the existing floor, set up a truck crane on the crane operation platform, and use the truck crane to install tree-shaped support (3) at the bottom of the aluminum alloy mesh shell (2); S6. Install a steel frame on the top of the aluminum alloy mesh shell (2), and install an electric hoist on the steel frame; S7. Use a crane to fix the Bailey frame (1) through the lifting hole, and then remove the inner secondary frame (102) that will collide with the tree support (3) during the direct lowering process on the steel frame, while keeping the outer main frame (101) that will not collide with the tree support (3) during the direct lowering process, so that the inner secondary frame (102) is completely separated from the outer main frame (101). S8. Use an electric hoist to lower the inner secondary frame (102) to the existing floor one by one, ensuring that there is no contact between the inner Bailey frame (1) and the tree support (3) during the lowering process. S9. Then, using lifting equipment (4), the outer ring main frame (101) is lowered as a whole to the existing floor. S10. Remove the steel frame.

2. The construction method for a cantilevered aluminum alloy roof according to claim 1, characterized in that: The connecting plate (104) is an angle steel, one side of which is fixed to the inner secondary frame (102) or inner connecting seat (103) by bolts, and the other side is connected to each other by bolts.

3. The construction method for a cantilevered aluminum alloy roof according to claim 2, characterized in that: The connecting plate (106) is a U-shaped plate with the opening facing upwards.

4. The construction method for a cantilevered aluminum alloy roof according to claim 3, characterized in that: In steps S1-4, the construction method for the Bailey bridge (1) and the aluminum alloy mesh shell (2) includes the following steps: S21. Erect a Bailey frame (1) on the top of the completed floor slab according to the layout position to provide an operating platform and lifting support for the subsequent assembly and lifting of the aluminum alloy mesh shell (2). S22. Connect the suspension point conversion device (7) and the Bailey bridge (1) at the designed suspension point position, and ensure that the lower suspension point of the suspension point conversion device (7) is outside the vertical projection range of the outer edge of the Bailey bridge (1); S23. The lifting equipment (4) includes lifting steel cable (5), steel cable anchor (6), lifting point conversion equipment (7), support column (8), lifting platform (9) and hydraulic lifter (10). The lifting platform (9) is installed on the support column (8) of the main structure next to the Bailey bridge (1) so that the upper lifting point of the lifting platform (9) is vertically aligned with the lower lifting point of the corresponding lifting point conversion equipment (7). S24. Complete the assembly of the entire aluminum alloy mesh shell (2) above the Bailey frame (1) and connect and fix the aluminum alloy mesh shell (2) to the Bailey frame (1); S25. Install a hydraulic lifter (10) at the lifting point on the lifting platform (9), and install the lifting steel cable (5) of the hydraulic lifter (10) onto the lifting point conversion device (7) through the steel cable anchor (6); S26. The aluminum alloy mesh shell (2) and Bailey frame (1) are lifted into place as a whole by hydraulic synchronous lifting equipment (4), and the aluminum alloy mesh shell (2) is temporarily connected and fixed to the supporting column (8) of the main structure on the side by limiting steel wire rope. S27. Install a support structure under the aluminum alloy mesh shell (2) and connect and fix the aluminum alloy mesh shell (2) to the support structure. After the connection and fixation, remove the limiting steel wire rope.

5. The construction method for a cantilevered aluminum alloy roof according to claim 4, characterized in that: The suspension point conversion device (7) includes a vertically arranged attachment frame (71). A horizontally extending anchor frame (72) is fixedly installed in the middle of one side of the attachment frame (71), and an installation hole is opened in the middle of the anchor frame (72). The top and bottom ends of the other side are fixed with connecting ear plates (73) connected to the Bailey bridge (1). The attachment frame (71) includes three spaced I-beams. The web of the three I-beams is connected by three square steel beams at the top, middle and bottom. The two outer I-beams are connected to the middle I-beams at their top and bottom ends. A diagonally arranged reinforcing square tube is fixed at the middle of each upright, and the four reinforcing square tubes form an X-shaped structure inside the attachment frame (71); the anchor frame (72) includes three I-beam crossbeams vertically welded to the middle of the wing plates of the three I-beam uprights. The web plates at the ends of the I-beam crossbeams are connected by an upward-opening U-shaped steel frame. The U-shaped steel frame is welded from three steel plates, and an installation hole is opened in the middle of the bottom horizontal plate. A reinforcing square steel is welded and fixed at the outer upright plate, and the two ends of the reinforcing square steel are respectively welded and fixed to the web plates of the I-beam crossbeams on both sides.

6. The construction method for a cantilevered aluminum alloy roof according to claim 5, characterized in that: The lifting platform (9) includes a vertically arranged heightening pole (91). The top of the heightening pole (91) is vertically fixed with a support beam (92) for installing a hydraulic synchronous lifting device (4) on the side away from the support column (8). The middle and bottom are vertically fixed with a connecting beam (93) on the side close to the support column (8). The connecting beam (93) is fixedly installed on the support column (8) by an arc-shaped clamp (94). Two arc-shaped clamps (94) are correspondingly sleeved on both sides of the support column (8) and connected as one unit by high-strength bolts (95).

7. The construction method for a cantilevered aluminum alloy roof according to claim 6, characterized in that: The hydraulic synchronous lifting device (4) includes a hydraulic lifter (10) installed on the lifting platform (9). The hydraulic lifter (10) is vertically arranged, and the lifting steel cable (5) inside it passes through the lifting platform (9) and the lifting point conversion device (7) from top to bottom at the upper and lower lifting points. The lifting steel cable (5) and the lifting point conversion device (7) are connected as one unit by a steel cable anchor (6).

8. The construction method for a cantilevered aluminum alloy roof according to claim 7, characterized in that: After the aluminum alloy mesh shell (2) is raised to 140mm-160mm, the raising is paused and left to stand for 4-12 hours. The deformation of the rod unit of the aluminum alloy mesh shell (2) is monitored to see if it matches the construction calculation. After confirming that there are no abnormalities, the formal raising begins.

9. The construction method for a cantilevered aluminum alloy roof according to claim 8, characterized in that: When the outer ring Bailey bridge (1) of S9 is lowered to a distance of 80mm-120mm from the aluminum alloy mesh shell (2), it is left to stand still for 3-5 hours. The deformation of the aluminum alloy mesh shell (2) is monitored using a total station.

10. A construction method for a cantilevered aluminum alloy roof according to claim 9, characterized in that: The steel frame is pre-welded from multiple steel sections and is horizontally mounted on top of the aluminum alloy mesh shell (2) and temporarily fixed by a connecting structure.

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