Cantilever building-based attached lifting scaffold outer protection system and construction method thereof

Abstract

The invention discloses an attached lifting scaffold outer protection system based on a cantilever building and a construction method of the attached lifting scaffold outer protection system. The protection system comprises a plurality of attached lifting scaffold protection units, and every two vertically adjacent attached lifting scaffold protection units are detachably connected; the construction method comprises the following steps: 1, constructing a standard floor balcony and a standard floor structural slab; secondly, an outer protection unit attached to the lifting scaffold is installed; 3, constructing a standard layer; and fourthly, another outer protection unit attached to the lifting scaffold is installed. The heightening stand columns are additionally arranged on the lower-layer balcony of the discontinuous section to serve as a mounting base layer of the wall-attached support assembly of the layer; according to the wall-attached support assembly, the wall-attached support assembly and the standard layer structural plate are connected in a pulling mode through the diagonal draw bar assembly in the lateral direction, so that the anti-overturning strength of the heightening stand column is improved, the problem that the wall-attached support assembly cannot be installed due to the large span of a cantilever building is solved, and the situation that due to the middle interruption phenomenon, serious potential safety hazards exist in external protection, and the attached type lifting scaffold cannot be normally used is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to an external protection system of an attached lifting scaffold based on a cantilever building and a construction method thereof. Background Art

[0002] The construction progress of the attached lifting scaffolding is coordinated with the progress requirements of the main structure construction. The frame is assembled from the standard layer. During the assembly, the frame can be used as an external protective frame and is constructed synchronously according to the main progress requirements. The wall-attached supports of the conventional attached upgraded scaffolding are installed on the concrete components of the facade of the building structure to ensure the stability of the external steel frame. However, with the emergence of ecological building structures, large cantilevered balconies are arranged in odd and even layers, the concrete structural components of the facade are not continuous at the same elevation, and the span is large. There is nowhere to install the wall-attached parts, the horizontal trusses cannot be connected end to end, and there is a discontinuity in the middle. There are serious safety hazards in the external protection, which makes the attached lifting scaffolding unable to be used normally. There is currently no construction process to solve this problem. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an external protection system for an attached lifting scaffolding based on a cantilever building in view of the deficiencies in the above-mentioned prior art, and to add heightening columns to the lower balcony of the discontinuous section to serve as the installation base for the wall-attached support components of this layer; the lateral inclined rod components are tied to the standard layer structural plates to improve the anti-overturning strength of the heightening columns, thereby solving the problem that the wall-attached support components have nowhere to be installed due to the large span of the cantilever building, and avoiding the situation where the external protection has serious safety hazards due to discontinuities in the middle, resulting in the inability to use the attached lifting scaffolding normally.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an external protection system of an attached lifting scaffolding based on a cantilever building and a construction method thereof, characterized in that the method comprises the following steps: It comprises a plurality of attachment lifting scaffolding protection units connected end to end from bottom to top, and two upper and lower adjacent attachment lifting scaffolding protection units are detachably connected; a flap is connected between the bottom of the attachment lifting scaffolding protection unit at the bottom and the horizontal crossbar of the cantilevered building support system; The structures of the plurality of attached lifting scaffolding protection units are the same. The attached lifting scaffolding protection units include an attached scaffolding support structure arranged on a standard layer structural plate and an attached scaffolding body arranged on the outside of the cantilevered building and connected to the attached scaffolding support structure. The attached scaffolding support structure and the attached scaffolding body are detachably connected. The attached scaffolding support structure includes a heightening column vertically arranged on a standard floor structural plate, a wall-attached support assembly matched with the heightening column, and a diagonal tie rod assembly obliquely arranged between the heightening column and the standard floor structural plate; the heightening column and the standard floor structural plate are detachably connected, the heightening column and the wall-attached support assembly are detachably connected, and the heightening column and the diagonal tie rod assembly are detachably connected; the heightening column is arranged on one side of the top beam close to the cantilevered building balcony.

[0005] The above-mentioned external protection system of the attached lifting scaffolding based on cantilevered buildings is characterized in that: the height-increasing columns include four vertical poles that are all vertically arranged on the standard layer structural plate, and a plurality of connecting frames are horizontally arranged between the four vertical poles, and the vertical poles and the connecting frames are welded; the height-increasing columns are installed on the standard layer structural plate by fixing bolts, and the fixing bolts are vertically penetrated between the connecting frame and the standard layer structural plate.

[0006] The above-mentioned external protection system of the attached lifting scaffolding based on the cantilever building is characterized in that: the wall-attached support assembly includes a first wall-attached support arranged on the height-increasing column and a second wall-attached support arranged on the top beam of the balcony of the cantilever building, and the structures of the first wall-attached support and the second wall-attached support are the same. The first wall-attached support and the second wall-attached support both include a vertically arranged tie rod anchor plate, a connecting plate vertically arranged on one side of the tie rod anchor plate, and a support rod arranged between the tie rod anchor plate and the connecting plate.

[0007] The above-mentioned external protection system of the attached lifting scaffolding based on the cantilever building is characterized in that: the pull rod anchor plate is provided with a fastening bolt for fixing its position; the connecting plate is a U-shaped plate, the opening of the connecting plate is away from the cantilever building, and the opening of the connecting plate cooperates with the attached scaffolding body; the connecting plate is penetrated with a connecting bolt that connects the attached scaffolding body and the connecting plate into one; an installation hole that cooperates with the connecting plate in the first wall-mounted support is opened above the attached scaffolding body, and an installation hole that cooperates with the connecting plate in the second wall-mounted support is opened below the attached scaffolding body.

[0008] The above-mentioned external protection system of the attached lifting scaffolding based on the cantilever building is characterized in that: the diagonal rod assembly includes a diagonal rod obliquely arranged between the vertical pole and the standard layer structural plate, and the number of the diagonal rods is equal to the number of the vertical poles and corresponds one to one; the top end of the diagonal rod is hinged to the vertical pole through an upper mounting seat, and the bottom end of the diagonal rod is hinged to the vertical pole through a lower mounting seat.

[0009] The above-mentioned external protection system of attached lifting scaffolding based on cantilever building is characterized in that: the upper mounting seat is fixed on the vertical pole; the lower mounting seat is installed on the standard layer structure plate, and the lower mounting seat is arranged on the side of the vertical pole away from the top beam; the lower mounting seat is installed on the standard layer structure plate by fixing bolts.

[0010] The above-mentioned external protection system of the attached lifting scaffolding based on the cantilever building is characterized in that the angle between the inclined rod and the vertical rod is 20°~25°.

[0011] The above-mentioned external protection system of the attached lifting scaffolding based on the cantilever building is characterized in that the inclination angle of the flap is 30°~60°, and the flap gradually tilts upward in the direction close to the top beam.

[0012] The present invention also provides a method for constructing a cantilever building based on an external protection system of an attached lifting scaffolding of the cantilever building, characterized in that the method comprises the following steps: Step 1: Construction of standard-floor balcony and standard-floor structural slab: Set up the construction templates of standard-floor balcony and standard-floor structural slab on the non-standard floor, and then perform concrete construction on the construction templates of standard-floor balcony and standard-floor structural slab, and form standard-floor balcony and standard-floor structural slab after the concrete solidifies; Step 2: Install an external protection unit of an attached lifting scaffold. The process is as follows: Step 201, installing a heightening column on a side of the standard floor structure plate close to the standard floor balcony, and erecting the heightening column on the standard floor structure plate using fixing bolts; then installing an upper mounting seat and a lower mounting seat on the heightening column and the standard floor structure plate respectively, and adjusting the angle between the diagonal brace and the column so that the diagonal brace is hinged between the corresponding upper mounting seat and the lower mounting seat; Step 202: Install a first wall-attached support on the upper part of the height-increasing column, and then install a second wall-attached support on the top beam of the standard-floor balcony; Step 203, using a crane to hoist the attachment scaffold body to the outside of the heightening column, so that the upper mounting hole of the attachment scaffold body cooperates with the connecting plate in the first wall-mounted support and is connected with the connecting bolts, and the lower mounting hole of the attachment scaffold body cooperates with the connecting plate in the second wall-mounted support and is connected with the connecting bolts; Step 204, connecting the flap between the bottom of the attached lifting scaffolding protection unit and the horizontal crossbar; completing the installation of the attached lifting scaffolding outer protection unit; Step 3: Standard floor construction: Set up standard floor formwork on the standard floor structural slab and pour concrete to carry out standard floor construction; Step 4: Install another external protection unit of the attached lifting scaffolding. The process is as follows: Step 401, repeat step 1, and construct the balcony and structural slab of the next standard floor from bottom to top; Step 402, repeating steps 201 and 202 to complete the installation of the attached scaffolding support structure in the outer protection system of another attached lifting scaffolding; then using a crane to lift the attached scaffolding body to the top of the previous attached scaffolding body, so that the four corners of the two attached scaffolding bodies are aligned; finally, the upper mounting holes of the attached scaffolding body are matched with the connecting plate in the first wall-mounted support and connected with connecting bolts, and the lower mounting holes of the attached scaffolding body are matched with the connecting plate in the second wall-mounted support and connected with connecting bolts; Step 403, repeat step 3, set up a standard layer formwork on the standard layer structural plate and pour concrete to perform standard layer construction; Step 404: Repeat steps 401 and 403 until the construction of all standard layers is completed.

[0013] The beneficial effect of the present invention is that heightened columns are added to the lower balcony of the discontinuous section to serve as the installation base of the wall-mounted support components of this layer; the inclined rod components are used to tie the standard layer structural plates laterally to improve the anti-overturning strength of the heightened columns, thereby solving the problem that the wall-mounted support components have nowhere to be installed due to the large span of the cantilevered building, and avoiding the situation where the external protection has serious safety hazards due to the discontinuity in the middle, resulting in the inability to use the attached lifting scaffolding normally.

[0014] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the connection relationship between the attached lifting scaffolding protection unit and the standard layer structural plate of the present invention.

[0016] Figure 2 It is a schematic diagram of the construction status of installing the external protection system of the attached lifting scaffolding of the present invention.

[0017] Figure 3 The figure is a flowchart of the method of the present invention.

[0018] Description of reference numerals: 1—standard layer structural board; 2—heightened column; 3—flap board; 4—vertical pole; 5—connecting frame; 6—attached scaffold body; 7—second reinforcement rod; 8—top beam; 9—tension rod anchor plate; 10—connecting plate; 11—support rod; 12—fastening bolts; 13—connecting bolt; 14—fixing bolt; 15—upper mounting seat; 16—lower mounting seat; 17—horizontal cross bar; 18—diagonal tie rod. DETAILED DESCRIPTION

[0019] like Figure 1 The external protection system of the attached lifting scaffolding based on the cantilever building shown in the figure comprises a plurality of attached lifting scaffolding protection units connected end to end from bottom to top, and two attached lifting scaffolding protection units adjacent to each other are detachably connected; a flap 3 is connected between the bottom of the attached lifting scaffolding protection unit located at the bottom and the horizontal crossbar 17 of the cantilever building support system; The structures of the plurality of attached lifting scaffolding protection units are the same. The attached lifting scaffolding protection units include an attached scaffolding support structure arranged on a standard layer structural plate 1 and an attached scaffolding body 6 arranged on the outside of the cantilevered building and connected to the attached scaffolding support structure. The attached scaffolding support structure and the attached scaffolding body 6 are detachably connected. The attached scaffolding support structure includes a heightening column 2 vertically arranged on a standard floor structural plate 1, a wall-attached support assembly cooperating with the heightening column 2, and a diagonal tie rod assembly obliquely arranged between the heightening column 2 and the standard floor structural plate 1; the heightening column 2 and the standard floor structural plate 1 are detachably connected, the heightening column 2 and the wall-attached support assembly are detachably connected, and the heightening column 2 and the diagonal tie rod assembly are detachably connected; the heightening column 2 is arranged on one side of the top beam 8 close to the cantilevered building balcony.

[0020] The present invention adds a heightening column 2 to the lower balcony of the discontinuous section to serve as the installation base of the wall-attached support assembly of this layer; the inclined rod assembly is laterally connected to the standard layer structural plate 1 to improve the anti-overturning strength of the heightening column 2, thereby solving the problem that the wall-attached support assembly has nowhere to be installed due to the large span of the cantilevered building, and avoiding the situation that the external protection has serious safety hazards due to the discontinuity in the middle, resulting in the inability to use the attached lifting scaffolding normally.

[0021] In this embodiment, the height-increasing column 2 includes four vertical poles 4 that are vertically arranged on the standard floor structural plate 1, and multiple connecting frames 5 are horizontally arranged between the four vertical poles 4, and the vertical poles 4 and the connecting frames 5 are welded. The height-increasing column 2 is installed on the standard floor structural plate 1 through fixing bolts 14, and the fixing bolts 14 are vertically penetrated between the connecting frames 5 and the standard floor structural plate 1.

[0022] like Figure 1 and Figure 2As shown, a first reinforcing rod is obliquely connected between the two upper and lower adjacent connection frames 5, and a second reinforcing rod 7 is horizontally arranged in the connection frame 5. The heightening column 2 is welded into a steel column by a square steel lattice structure. The steel column is welded by a 50*50*3mm square tube, with a cross-section length of 600mm and a width of 350mm. The height is determined according to the floor height of the building, the balcony slab elevation and the installation elevation of the wall support. The height of the steel column of the heightening column 2 is 3.6m. The bottom surface of the steel column is welded by a square steel lattice, which is convenient for fixing the anchor bolts. Two Φ40mm bolt holes are embedded during the construction of the balcony floor slab. When installing the steel column, two M30*550mm bolts are fixed through the standard layer structure plate 1.

[0023] In this embodiment, the wall-attached support assembly includes a first wall-attached support arranged on the height-increasing column 2 and a second wall-attached support arranged on the top beam 8 of the cantilevered building balcony. The structures of the first wall-attached support and the second wall-attached support are the same. The first wall-attached support and the second wall-attached support both include a vertically arranged tie rod anchor plate 9, a connecting plate 10 vertically arranged on one side of the tie rod anchor plate 9, and a support rod 11 arranged between the tie rod anchor plate 9 and the connecting plate 10.

[0024] In this embodiment, the tie rod anchor plate 9 is provided with a fastening bolt 12 for fixing its position; the connecting plate 10 is a U-shaped plate, the opening of the connecting plate 10 is away from the cantilevered building, and the opening of the connecting plate 10 cooperates with the attached scaffolding body 6; the connecting plate 10 is pierced with a connecting bolt 13 that connects the attached scaffolding body 6 and the connecting plate 10 as a whole; the upper part of the attached scaffolding body 6 is provided with a mounting hole that cooperates with the connecting plate 10 in the first wall-mounted support, and the lower part of the attached scaffolding body 6 is provided with a mounting hole that cooperates with the connecting plate 10 in the second wall-mounted support.

[0025] like Figure 1 and Figure 2 As shown, a horizontally arranged support rod 11 and an obliquely arranged support rod 11 are arranged on the back of the connecting plate 10 for supporting and connecting the connecting plate 10 .

[0026] The tie rod anchor plate 9 in the first wall-attached support is installed on the upper part of the height-increasing column 2, and its fastening bolts 12 are installed on the corresponding column 4; the tie rod anchor plate 9 in the second wall-attached support is installed on the top beam 8 of the cantilevered building balcony below the height-increasing column 2, and its fastening bolts 12 are installed on the top beam 8 of the cantilevered building balcony.

[0027] In this embodiment, the diagonal tie rod assembly includes a diagonal tie rod 18 obliquely arranged between the vertical rod 4 and the standard layer structural plate 1, and the number of the diagonal tie rods 18 is equal to the number of the vertical rods 4 and corresponds one to one; the top end of the diagonal tie rod 18 is hinged to the vertical rod 4 through an upper mounting seat 15, and the bottom end of the diagonal tie rod 18 is hinged to the vertical rod 4 through a lower mounting seat 16.

[0028] In this embodiment, the upper mounting seat 15 is fixed on the vertical pole 4; the lower mounting seat 16 is installed on the standard layer structural plate 1, and the lower mounting seat 16 is arranged on the side of the vertical pole 4 away from the top beam 8; the lower mounting seat 16 is installed on the standard layer structural plate 1 by fixing bolts 14.

[0029] In this embodiment, the angle between the inclined rod 18 and the vertical rod 4 is 20° to 25°.

[0030] In actual use, the angle between the inclined rod 18 and the vertical rod 4 is preferably 21°.

[0031] In this embodiment, the tilt angle of the flap 3 is 30° to 60°, and the flap 3 gradually tilts upward in a direction close to the top beam 8 .

[0032] like Figures 1 to 3 The method for constructing a cantilever building based on the external protection system of the attached lifting scaffolding of the cantilever building shown includes the following steps: Step 1: Construction of standard-floor balcony and standard-floor structural slab: Set up construction templates of standard-floor balcony and standard-floor structural slab on the non-standard floor, then perform concrete construction on the construction templates of standard-floor balcony and standard-floor structural slab, and form standard-floor balcony and standard-floor structural slab 1 after the concrete solidifies; Step 2: Install an external protection unit of an attached lifting scaffold. The process is as follows: Step 201, install the heightening column 2 on the standard floor structural plate 1 and on the side close to the standard floor balcony, and use the fixing bolts 14 to erect the heightening column 2 on the standard floor structural plate 1; then install the upper mounting seat 15 and the lower mounting seat 16 on the heightening column 2 and the standard floor structural plate 1 respectively, and adjust the angle between the diagonal brace 18 and the column 4 so that the diagonal brace 18 is hinged between the corresponding upper mounting seat 15 and the lower mounting seat 16; Step 202: Install a first wall-attached support on the upper part of the height-increasing column 2, and then install a second wall-attached support on the top beam 8 of the standard-floor balcony; Step 203, using a crane to hoist the attachment scaffold body 6 to the outside of the heightening column 2, so that the upper mounting hole of the attachment scaffold body 6 cooperates with the connecting plate 10 in the first wall-mounted support and is connected with the connecting bolts 13, and the lower mounting hole of the attachment scaffold body 6 cooperates with the connecting plate 10 in the second wall-mounted support and is connected with the connecting bolts 13; Step 204, connecting the flap 3 between the bottom of the attached lifting scaffolding protection unit and the horizontal crossbar 17; completing the installation of the attached lifting scaffolding outer protection unit; Step 3: Standard layer construction: erecting a standard layer formwork on the standard layer structural plate 1 and pouring concrete to carry out standard layer construction; Step 4: Install another external protection unit of the attached lifting scaffolding. The process is as follows: Step 401, repeat step 1, and construct the balcony and structural slab of the next standard floor from bottom to top; Step 402, repeating steps 201 and 202 to complete the installation of the attached scaffolding support structure in the outer protection system of another attached lifting scaffolding; then using a crane to lift the attached scaffolding body 6 to the top of the previous attached scaffolding body 6, so that the four corners of the two attached scaffolding bodies 6 are aligned; finally, the upper mounting hole of the attached scaffolding body 6 is matched with the connecting plate 10 in the first wall-mounted support and connected with the connecting bolts 13, and the lower mounting hole of the attached scaffolding body 6 is matched with the connecting plate 10 in the second wall-mounted support and connected with the connecting bolts 13; Step 403, repeat step 3, set up a standard layer formwork on the standard layer structural plate 1 and pour concrete to perform standard layer construction; Step 404: Repeat steps 401 and 403 until the construction of all standard layers is completed.

[0033] In step 1, the construction formwork of the standard-layer balcony is supported by an aluminum film system to improve the support strength of the balcony beams and slabs. At the same time, the formwork support system at the lower part of the balcony beams and slabs at the odd and even layers of the support is equipped with 3 layers (a total of six layers) to ensure that it will not be dismantled. The load of the attached lifting scaffolding is transmitted layer by layer through the support system to ensure the stability of the supporting structure. The balcony formwork support frame within the protective layer of the attached lifting scaffolding is also guaranteed not to be dismantled, as a content protection system for the scaffolding. The balcony formwork support range rises synchronously with each layer of the attached lifting scaffolding support.

[0034] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. The external protection system of the attached lifting scaffolding based on the cantilever building is characterized by: It comprises a plurality of attachment lifting scaffolding protection units connected end to end in sequence from bottom to top, wherein two upper and lower adjacent attachment lifting scaffolding protection units are detachably connected; a flap (3) is connected between the bottom of the attachment lifting scaffolding protection unit located at the bottom and a horizontal crossbar (17) of the cantilevered building support system; The structures of the plurality of attached lifting scaffolding protection units are all the same, and the attached lifting scaffolding protection units comprise an attached scaffolding support structure arranged on a standard layer structural plate (1) and an attached scaffolding body (6) arranged on the outside of the cantilevered building and connected to the attached scaffolding support structure, wherein the attached scaffolding support structure and the attached scaffolding body (6) are detachably connected; The attached scaffolding support structure comprises a heightening column (2) vertically arranged on a standard-floor structural plate (1), a wall-attached support assembly matched with the heightening column (2), and a diagonal brace assembly obliquely arranged between the heightening column (2) and the standard-floor structural plate (1); the heightening column (2) and the standard-floor structural plate (1) are detachably connected, the heightening column (2) and the wall-attached support assembly are detachably connected, and the heightening column (2) and the diagonal brace assembly are detachably connected; the heightening column (2) is arranged on a side of a top beam (8) close to a cantilevered building balcony.

2. According to claim 1, the external protection system of the attached lifting scaffolding based on the cantilever building is characterized by: The height-increasing column (2) comprises four vertical poles (4) which are all arranged vertically on the standard-floor structural plate (1); a plurality of connecting frames (5) are arranged horizontally between the four vertical poles (4); the vertical poles (4) and the connecting frames (5) are connected by welding; the height-increasing column (2) is installed on the standard-floor structural plate (1) by means of fixing bolts (14); the fixing bolts (14) are vertically penetrated between the connecting frames (5) and the standard-floor structural plate (1).

3. The external protection system of the attached lifting scaffolding based on cantilevered buildings according to claim 2 is characterized in that: The wall-attached support assembly comprises a first wall-attached support arranged on the height-increasing column (2) and a second wall-attached support arranged on the top beam (8) of the cantilevered building balcony, the first wall-attached support and the second wall-attached support having the same structure, and both the first wall-attached support and the second wall-attached support comprising a vertically arranged tie rod anchor plate (9), a connecting plate (10) vertically arranged on one side of the tie rod anchor plate (9), and a support rod (11) arranged between the tie rod anchor plate (9) and the connecting plate (10).

4. According to claim 3, the external protection system of the attached lifting scaffolding based on the cantilever building is characterized in that: The tie rod anchor plate (9) is provided with a fastening bolt (12) for fixing its position; the connecting plate (10) is a U-shaped plate, the opening of the connecting plate (10) is away from the cantilevered building, and the opening of the connecting plate (10) cooperates with the attached scaffold body (6); the connecting plate (10) is provided with a connecting bolt (13) for connecting the attached scaffold body (6) and the connecting plate (10) as a whole; the upper part of the attached scaffold body (6) is provided with a mounting hole for cooperating with the connecting plate (10) in the first wall-attached support, and the lower part of the attached scaffold body (6) is provided with a mounting hole for cooperating with the connecting plate (10) in the second wall-attached support.

5. The external protection system of the attached lifting scaffolding based on cantilevered buildings according to claim 4 is characterized in that: The diagonal brace assembly comprises a diagonal brace (18) obliquely arranged between the vertical pole (4) and the standard layer structural plate (1), wherein the number of the diagonal brace (18) is equal to and corresponds to the number of the vertical pole (4); the top end of the diagonal brace (18) is hinged to the vertical pole (4) via an upper mounting seat (15), and the bottom end of the diagonal brace (18) is hinged to the vertical pole (4) via a lower mounting seat (16).

6. The external protection system of the attached lifting scaffolding based on cantilevered buildings according to claim 5 is characterized in that: The upper mounting seat (15) is fixed on the vertical pole (4); the lower mounting seat (16) is mounted on the standard-floor structural plate (1), and the lower mounting seat (16) is arranged on a side of the vertical pole (4) away from the top beam (8); the lower mounting seat (16) is mounted on the standard-floor structural plate (1) by means of fixing bolts (14).

7. The external protection system of the attached lifting scaffolding based on cantilevered buildings according to claim 5 is characterized in that: The angle between the inclined brace (18) and the vertical rod (4) is 20° to 25°.

8. The external protection system of the attached lifting scaffolding based on cantilevered buildings according to claim 1 is characterized in that: The tilt angle of the flap (3) is 30° to 60°, and the flap (3) gradually tilts upwards in a direction approaching the top beam (8).

9. The method for constructing a cantilever building using an external protection system of an attached lifting scaffolding based on a cantilever building according to claim 6, characterized in that: The method comprises the following steps: Step 1: Construction of standard-floor balcony and standard-floor structural slab: Set up construction templates for standard-floor balcony and standard-floor structural slab on the non-standard floor, then perform concrete construction on the construction templates for standard-floor balcony and standard-floor structural slab, and after the concrete solidifies, form standard-floor balcony and standard-floor structural slab (1); Step 2: Install an external protection unit of an attached lifting scaffold. The process is as follows: Step 201, installing a heightening column (2) on a side of the standard floor structural plate (1) close to the standard floor balcony, and using fixing bolts (14) to erect the heightening column (2) on the standard floor structural plate (1); then installing an upper mounting seat (15) and a lower mounting seat (16) on the heightening column (2) and the standard floor structural plate (1) respectively, and adjusting the angle between the diagonal brace (18) and the column (4) so ​​that the diagonal brace (18) is hinged between the corresponding upper mounting seat (15) and the lower mounting seat (16); Step 202: Install a first wall-attached support on the upper part of the height-increasing column (2), and then install a second wall-attached support on the top beam (8) of the standard-floor balcony; Step 203, using a crane to hoist the attachment scaffold body (6) to the outside of the heightening column (2), so that the upper mounting hole of the attachment scaffold body (6) cooperates with the connecting plate (10) in the first wall-mounted support and is connected with the connecting bolt (13), and the lower mounting hole of the attachment scaffold body (6) cooperates with the connecting plate (10) in the second wall-mounted support and is connected with the connecting bolt (13); Step 204, connecting the flap (3) between the bottom of the attached lifting scaffolding protection unit and the horizontal crossbar (17); completing the installation of the attached lifting scaffolding outer protection unit; Step 3: Standard layer construction: erecting a standard layer formwork on the standard layer structural slab (1) and pouring concrete to carry out standard layer construction; Step 4: Install another external protection unit of the attached lifting scaffolding. The process is as follows: Step 401, repeat step 1, and construct the balcony and structural slab of the next standard floor from bottom to top; Step 402, repeating steps 201 and 202 to complete the installation of the attached scaffolding support structure in the outer protection system of another attached lifting scaffolding; then using a crane to lift the attached scaffolding body (6) to the top of the previous attached scaffolding body (6), so that the four corners of the two attached scaffolding bodies (6) are aligned; finally, the upper mounting hole of the attached scaffolding body (6) is matched with the connecting plate (10) in the first wall-mounted support and connected with the connecting bolt (13), and the lower mounting hole of the attached scaffolding body (6) is matched with the connecting plate (10) in the second wall-mounted support and connected with the connecting bolt (13); Step 403, repeating step 3, setting up a standard layer formwork on the standard layer structural plate (1) and pouring concrete to perform standard layer construction; Step 404: Repeat steps 401 and 403 until the construction of all standard layers is completed.

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