A high-rise building prefabricated exterior panel high-altitude demolition structure and its construction method

Abstract

This invention discloses a high-altitude demolition structure and construction method for prefabricated exterior panels of high-rise buildings. The demolition structure includes an upper floor slab, a lower floor slab, an upper and lower hanging panel connecting the upper and lower floor slabs, glass connecting the upper and lower hanging panels, a hanging assembly connecting the upper hanging panel and the upper floor slab, a hanging assembly connecting the lower hanging panel and the lower floor slab, a top support, and hoisting ropes installed on the upper and lower hanging panels. This invention, through the division of the upper and lower hanging panels, facilitates more accurate and targeted demolition design and hoisting methods; the design of the upper and lower hanging panel demolition methods reduces unnecessary fixing and safety hazards; and for heavy and large-sized structures, segmented construction design more effectively avoids feasibility and safety issues in demolition; combined with BIM software, key demolition points and hoisting points are marked, facilitating convenient and orderly construction; segmenting the original hanging panels effectively ensures the safety and feasibility of hoisting.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and specifically relates to a high-altitude demolition structure for prefabricated external panels of high-rise buildings and its construction method. Background Technology

[0002] In the past, high-rise building construction often used precast concrete cladding panels for exterior decoration. However, with the changing times, these panels have gradually faded from use. In recent years, with the rise of urban renewal, many high-rise buildings require renovation and reconstruction, including the removal of precast concrete cladding panels. Traditionally, scaffolding was erected on the facade, and manual demolition was carried out. However, relying solely on manual demolition without a comprehensive structural plan beforehand leads to wasted manpower and resources, unclear structural details, disorganized hoisting, and frequent rework and delays. Even worse, the weight and size of the panels, coupled with improper hoisting, have resulted in safety accidents. Summary of the Invention

[0003] This invention provides a method for high-altitude removal of precast concrete exterior panels in high-rise buildings, which solves the technical problems of classifying, cutting, and segmenting the removal of precast concrete exterior panels.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-rise building prefabricated exterior panel high-altitude removal structure includes an upper floor slab, a lower floor slab, an upper panel and a lower panel connected between the upper floor slab and the lower floor slab, glass connected between the upper panel and the lower panel, a hanging assembly connected between the upper panel and the upper floor slab, a hanging assembly and a top support connected between the lower panel and the lower floor slab, and a hoisting rope installed on the upper panel and the lower panel.

[0006] The hanging assembly includes a hanging plate connected to the top of the upper or lower floor slab, a floor slab embedded part connected between the hanging plate and the upper or lower floor slab, and a hanging plate top connecting plate disposed on the top of the upper or lower hanging plate; the hanging plate top connecting plate is fixedly connected to the hanging plate.

[0007] The top support includes a top support rod, a top support plate connected to the top of the top support rod, and a top support base plate connected to the bottom of the top support rod; a bracket is provided below the top support base plate, and the bracket is connected to the lower floor slab; a trapezoidal groove is provided at the bottom of the lower hanging plate to correspondingly fasten the top support.

[0008] Furthermore, the upper floor slab and the lower floor slab are respectively connected to the upper beam and the lower beam, and the upper floor slab and the lower floor slab are respectively thickened on the outer side of the corresponding upper beam and the lower beam.

[0009] Furthermore, the floor slab embedded part is Π-shaped, and at least half of the top plate of the floor slab embedded part is fixedly connected to the embedded connecting plate; a pad can also be detachably provided between the top connecting plate of the hanging plate and the embedded connecting plate, and the height of the pad is adapted to the height of the upper or lower hanging plate extending beyond the top surface of the floor slab.

[0010] Furthermore, the top connecting plate of the hanging panel is inverted U-shaped and is snapped onto or pre-embedded in the upper or lower hanging panel; the top connecting plate of the hanging panel is detachably connected to the hanging connecting plate and is provided with lifting holes for hoisting; the lifting holes are provided in the gaps between the upper or lower hanging panel and the upper or lower floor slab respectively.

[0011] Furthermore, an end corner piece is fixedly connected to the outer corner of the lower floor slab. The end corner piece is an inverted L-shaped piece, with the horizontal part of the inverted L-shaped piece flush with the top of the lower floor slab and the vertical part of the inverted L-shaped piece flush with the outer side of the lower floor slab. A bracket is fixedly connected to the vertical part, and the top of the bracket is fixedly connected to the top support plate.

[0012] Furthermore, the bottom of the upper panel and the top of the lower panel are respectively set as stepped splicing seams, with inter-panel connectors on the outside of the splicing seams and sealing components in the middle. Fiberglass mat is also provided on the inside of the splicing seams and between them and the upper floor slab.

[0013] Furthermore, the construction method for high-altitude removal of prefabricated exterior panels from high-rise buildings includes the following specific steps:

[0014] Step 1: Based on the original design drawings and on-site measurements, establish a BIM model of the external panel structure to be demolished, highlighting the dimensions and estimated weight of each demolished panel, and numbering and marking the cut points, sealant, and fiberglass mat locations.

[0015] Step 2: At the demolition site, break the glass between the upper and lower panels; install a suspended platform on the top of the building to be demolished, and use the platform to remove the exterior aluminum decorative columns, sealant, fiberglass mat, and expanding cement mortar between the structural exterior panels;

[0016] Step 3: For the joints of the upper or lower panels, clean the sealant filling and the foamed polyethylene core rods of the lining at the joints, and then clean the fiberglass mat to expose the original unit of the original spliced ​​upper or lower panels.

[0017] Step 4: Drill holes for the unitized upper and lower panels. Outdoor work is carried out by installing a suspended platform on the roof, while indoor work is carried out by installing mobile scaffolding. The completed upper panels are temporarily hoisted using ropes.

[0018] Step 5: Before construction, cut the lightning protection round steel on each floor, then use gas welding to cut the upper steel reinforcement tie points of the plate; remove the upper hanging plate with temporary hoisting rope connection, first cut the side of the hanging plate with the hoisting hole near the upper floor slab; form a more stable hoisting system at the hoisting hole of the hanging plate, and then lift the upper hanging plate away with hoisting rope.

[0019] Step Six: For the removal of the lower hanging plate, clean the sealing components at the bottom of the lower hanging plate. Set lifting holes for the vertical part of the trapezoidal groove where the top support and corbel are located and the top of the lower hanging plate. Cut the side of the hanging plate with the lifting hole near the upper floor slab, and form a more stable lifting system at the lifting hole where the hanging plate is connected. Gradually lift the upper and lower support points after the final cut, and then gradually complete the lifting.

[0020] Furthermore, two hoisting fixing points are set up, which are fixed to the two ends of the upper opening of the exterior window with hoisting ropes respectively. The firmness and spacing of the two fixing points are checked. To prevent displacement of the two hoisting points, the hoisting beam is processed in advance. The hoisting rope is inserted into the gap between the top of the slab and the structure and then looped back for fixing.

[0021] Furthermore, the lower hanging plate is connected to the underside of the corbel by a connecting plate, which is pre-cut during demolition. A buffer pad is also installed between the lower hanging plate and the top support plate. The buffer pad and sealing material are cleaned first, and the welded connection between the top support plate and the lower hanging plate is preserved and then cut.

[0022] Furthermore, for heavy and large-sized upper and lower hanging panels, BIM is used to divide the panels into sections in the early stage and lift them off in different areas; for the segmented hanging panels, the lower part of the upper hanging panel is cut first and the cut part is temporarily fixed and supported by mobile scaffolding; the upper part of the lower hanging panel is cut first and the cut part is temporarily fixed and supported by mobile scaffolding.

[0023] The beneficial effects of this invention are reflected in:

[0024] 1) This invention, through the division of the upper and lower hanging plates and their different dismantling structures, facilitates more accurate and targeted dismantling designs and lifting methods;

[0025] 2) The present invention, through the setting of the upper and lower hanging plate removal methods, helps to ensure orderly construction, reduce unnecessary fixing and safety hazards, and more effectively avoids the feasibility and safety of dismantling for heavy and large-sized objects by dividing the construction into sections.

[0026] 3) This invention, combined with BIM software, marks the key demolition points and lifting points in the early stage, which facilitates convenient and orderly construction; on the other hand, it can divide the original hanging panels into sections, which can effectively ensure the safety and feasibility of hoisting.

[0027] 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

[0028] Figure 1 This is a schematic diagram of the high-altitude demolition structure for prefabricated exterior panels of high-rise buildings.

[0029] Figure 2 This is a schematic diagram of the top connection of the upper mounting plate;

[0030] Figure 3 This is a schematic diagram of the top connection of the lower mounting plate;

[0031] Figure 4 This is a diagram showing the connection of the upper panel joint.

[0032] Attached reference numerals: 1-Upper beam, 2-Upper floor slab, 3-Lower floor slab, 4-Lower beam, 5-Hanging assembly, 51-Hanging plate, 52-Floor slab embedded part, 53-Hanging plate top connecting plate, 6-Upper hanging plate, 7-Lower hanging plate, 8-Top support component, 81-Top support rod, 82-Top support plate, 83-Top support bottom plate, 9-Hanging rope, 10-Glass, 11-End corner piece, 12-Corner, 13-Sealing assembly, 14-Rock wool board, 15-Inter-board connector, 16-Fiberglass felt. Detailed Implementation

[0033] Taking the removal of a precast concrete exterior panel as an example, such as Figures 1 to 4 As shown, the high-rise building prefabricated exterior panel high-altitude demolition structure includes an upper floor slab 2, a lower floor slab 3, an upper panel 6 and a lower panel 7 connecting the upper floor slab 2 and the lower floor slab 3, a glass panel 10 connecting the upper panel 6 and the lower panel 7, a hanging assembly 5 connecting the upper panel 6 and the upper floor slab 2, a hanging assembly 5 connecting the lower panel 7 and the lower floor slab 3, a top support 8, and a suspension rope 9 installed on the upper panel 6 and the lower panel 7. The upper floor slab 2 and the lower floor slab 3 are respectively connected to the upper beam 1 and the lower beam 4, and the upper floor slab 2 and the lower floor slab 3 are thickened on the outer side of their respective upper beam 1 and lower beam 4. The bottom of the upper panel 6 and the top of the lower panel 7 are respectively set as stepped splicing joints. A panel connector 15 is installed on the outer side of the splicing joint, and a sealing assembly 13 is installed in the middle. A fiberglass mat 16 is also installed on the inner side of the splicing joint between the upper panel 2 and the upper floor slab 3.

[0034] In this embodiment, the hanging assembly 5 includes a hanging plate 51 connected to the top of the upper floor slab 2 or the lower floor slab 3, a floor slab embedded part 52 connected between the hanging plate 51 and the upper floor slab 2 or the lower floor slab 3, and a hanging plate top connecting plate 53 disposed on the top of the upper hanging plate 6 or the lower hanging plate 7; the hanging plate top connecting plate 53 is fixedly connected to the hanging plate 51.

[0035] In this embodiment, the top support member 8 includes a top support rod 81, a top support plate 82 connected to the top of the top support rod 81, and a top support base plate 83 connected to the bottom of the top support rod 81; a bracket 12 is provided below the top support base plate 83, and the bracket 12 is connected to the lower floor slab 3. The bottom of the lower hanging plate 7 is provided with a trapezoidal groove to correspondingly fasten the top support member 8.

[0036] In this embodiment, the floor slab embedded part 52 is a Π-shaped steel part, and at least half of the top plate of the floor slab embedded part 52 is fixedly connected to the embedded connecting plate; a pad can also be detachably provided between the hanging plate top connecting plate 53 and the embedded connecting plate, and the height of the pad is adapted to the height of the upper hanging plate 6 or the lower hanging plate 7 extending out of the top surface of the floor slab.

[0037] In this embodiment, the top connecting plate 53 of the hanging plate is an inverted U-shaped steel piece, which is snapped onto or pre-embedded on the upper hanging plate 6 or the lower hanging plate 7; the top connecting plate 53 of the hanging plate is detachably connected to the hanging connecting plate 51 and a lifting hole for hoisting is provided on the hanging connecting plate 51; the lifting hole is provided in the gap between the upper hanging plate 6 or the lower hanging plate 7 and the upper floor slab 2 or the lower floor slab 3 respectively.

[0038] In this embodiment, a corner piece 11 is fixedly connected to the outer corner of the lower floor slab 3. The corner piece 11 is an inverted L-shaped piece. The horizontal part of the inverted L-shaped piece is flush with the top of the lower floor slab 3, and the vertical part of the inverted L-shaped piece is flush with the outer side of the lower floor slab 3. A bracket 12 is fixedly connected to the vertical part, and the top of the bracket 12 is fixedly connected to the top support plate 83.

[0039] Combination Figures 1 to 4 As shown, the construction method for high-altitude removal of prefabricated external cladding panels from high-rise buildings is further explained. The specific steps are as follows:

[0040] Step 1: Based on the original design drawings and on-site measurements, establish a BIM model of the external panel structure to be demolished, highlighting the dimensions and estimated weight of each demolished panel, and numbering and marking the cut points, sealant, and fiberglass mat 16 locations.

[0041] Step 2: At the demolition site, break the glass 10 between the upper panel 6 and the lower panel 7; install a suspended platform on the top of the building to be demolished, and operate the suspended platform to remove the exterior aluminum decorative columns, remove the sealant between the structural exterior panels, fiberglass felt 16 and expanding cement mortar.

[0042] During the demolition process, glass 10 was broken manually, and the window was removed using gas welding. The components were then transported indoors. The window frame and the outer panel have 16 connection points, four on each side.

[0043] Step 3: For the joint of the upper panel 6 or the lower panel 7, clean the sealant filling the joint and the foamed polyethylene core rod of the lining, and then clean the fiberglass mat 16 to expose the original unit of the original spliced ​​upper panel 6 or lower panel 7.

[0044] Step 4: Drill holes for the unitized upper hanging plate 6 and lower hanging plate 7. Outdoor work is carried out by installing a suspended platform on the roof, while indoor work is carried out by installing mobile scaffolding. The upper hanging plate 6 is temporarily hoisted by ropes 9 after it is installed.

[0045] In this embodiment, a warning line is set up on the first floor of the hoisting coverage area outdoors, and no less than two guards are arranged and equipped with walkie-talkies. Personnel are strictly prohibited from entering or leaving the hoisting coverage area. Considering the overall hoisting of the external structural panels, a trial hoisting is required for safety reasons. After ensuring that the hoisting points are firmly installed, the lightning protection lead wire and other connection points between the panels and the structure are cut. After the above work is completed, the slinger, signalman and tower crane operator work together to keep the main hook and hoisting rope 9 in a vertically taut state.

[0046] Step 5: Before construction, cut the lightning protection round steel on each floor, and then use gas welding to cut the upper steel bar tie points of the plate; remove the upper hanging plate 6 with temporary hoisting rope 9, and first cut the side of the hanging plate 51 with its hoisting hole near the upper floor slab 2; form a more stable hoisting system at the hoisting hole of the hanging plate 51, and then hoist the upper hanging plate 6 away with the hoisting rope 9.

[0047] For the hoisting, two fixed points are set up, and each is fixed to the two ends of the upper opening of the exterior window with hoisting rope 9. The firmness and spacing of the two fixed points are checked. To prevent the two hoisting points from shifting, the hoisting beam is processed in advance. The hoisting rope 9 is inserted from the gap between the top of the slab and the structure and looped back for fixation.

[0048] Step 6: Remove the lower hanging plate 7, clean the sealing component 13 at the bottom of the lower hanging plate 7, set lifting holes for the vertical part of the trapezoidal groove where the top support 8 and the bracket 12 are located and the top of the lower hanging plate 7, cut the side of the hanging plate 51 with its lifting hole near the upper floor slab 2, and form a more stable lifting system at the lifting hole where the hanging plate 51 is connected; lift gradually at the final cut of the upper support and the lower support, and then gradually complete the lifting.

[0049] The lower hanging plate 7 is connected to the bracket 12 by a connecting plate, which is pre-cut during the demolition construction; a buffer pad is also set between the lower hanging plate 7 and the top support plate 82. The buffer pad and sealing material are cleaned first, and the welded connection between the top support plate 82 and the lower hanging plate 7 is retained and then cut.

[0050] In addition, for the heavy and large-sized panels of the upper hanging plate 6 and the lower hanging plate 7, the panels are divided in the early stage in conjunction with BIM and lifted out of the area by area; for the panel of the panel, the lower part of the upper hanging plate 6 is cut first and the cut part is temporarily fixed and supported by mobile scaffolding; the upper part of the lower hanging plate 7 is cut first and the cut part is temporarily fixed and supported by mobile scaffolding.

[0051] The entire hoisting process should be closely monitored, with safety personnel, production staff, and technical personnel assigned to oversee and coordinate the operation. The outer panels should ultimately be hoisted onto flatbed trucks and transported to an off-site disposal site. After each outer panel is hoisted, edge protection should be promptly implemented using a steel pipe protective frame, 1.5m high, with three horizontal bars, a toe board at the bottom, and metal dustproof netting. The protective railings must be securely and reliably fixed. It is particularly important to erect edge protection scaffolding immediately after the removal of each outer panel. Following the demolition of the outer wall, the curtain wall construction will commence. In addition to normal demolition acceptance, the curtain wall contractor should inspect the demolished area to ensure it meets the conditions for subsequent construction. Any areas not properly demolished should be rectified, and the work area should be handed over.

[0052] 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 high-altitude demolition of prefabricated external cladding panels in high-rise buildings, characterized in that, Includes an upper floor slab (2), a lower floor slab (3), an upper hanging plate (6) and a lower hanging plate (7) connecting the upper floor slab (2) and the lower floor slab (3), a glass (10) connecting the upper hanging plate (6) and the lower hanging plate (7), a hanging assembly (5) connecting the upper hanging plate (6) and the upper floor slab (2), a hanging assembly (5) connecting the lower hanging plate (7) and the lower floor slab (3), a top support (8), and a suspension rope (9) provided on the upper hanging plate (6) and the lower hanging plate (7); The hanging assembly (5) includes a hanging plate (51) connected to the top of the upper floor slab (2) or the lower floor slab (3), a floor slab embedded part (52) connected between the hanging plate (51) and the upper floor slab (2) or the lower floor slab (3), and a hanging plate top connecting plate (53) set on the top of the upper hanging plate (6) or the lower hanging plate (7); the hanging plate top connecting plate (53) is fixedly connected to the hanging plate (51); The top support member (8) includes a top support rod (81), a top support plate (82) connected to the top of the top support rod (81), and a top support base plate (83) connected to the bottom of the top support rod (81); a bracket (12) is provided below the top support base plate (83), and the bracket (12) is connected to the lower floor slab (3); a trapezoidal groove is provided at the bottom of the lower hanging plate (7) to correspondingly fasten the top support member (8); The top connecting plate (53) of the hanging plate is detachably connected to the hanging plate (51) and a lifting hole for hoisting is provided on the hanging plate (51); the lifting hole is provided in the gap between the upper hanging plate (6) or the lower hanging plate (7) and the upper floor slab (2) or the lower floor slab (3) respectively. A construction method for high-altitude removal of prefabricated external cladding panels from high-rise buildings, characterized by the following specific steps: Step 1: Based on the original design drawings and on-site measurements, establish a BIM model of the external panel structure to be demolished, highlighting the dimensions and estimated weight of each demolished panel, and numbering and marking the locations of the cuts, sealant, and fiberglass mat (16). Step 2: At the demolition site, break the glass (10) between the upper hanging plate (6) and the lower hanging plate (7); install a scaffold on the top of the building to be demolished, and operate the scaffold to demolish the aluminum decorative columns of the exterior wall, remove the sealant between the structural exterior hanging plates, glass fiber felt (16) and expanding cement mortar; Step 3: For the splicing joint of the upper hanging plate (6) or the lower hanging plate (7), clean the sealant filling the splicing joint and the foamed polyethylene core rod of the inner lining, and then clean the glass fiber felt (16) so that the original spliced ​​upper hanging plate (6) or lower hanging plate (7) exposes the original unit. Step 4: Drill holes for the unitized upper hanging plate (6) and lower hanging plate (7). Outdoor work is carried out by installing a suspended basket on the roof, and indoor work is carried out by installing a mobile scaffold. The upper hanging plate (6) that has been drilled is temporarily hoisted by a rope (9). Step 5: Before construction, cut the lightning protection round steel on each floor, and then cut the upper steel bar tie points of the plate by gas welding; remove the upper hanging plate (6) with temporary hoisting rope (9) and cut the side of the hanging plate (51) with the hoisting hole near the upper floor slab (2); form a more stable hoisting system at the hoisting hole of the hanging plate (51), and then hoist the upper hanging plate (6) away with the hoisting rope (9); Step 6: Remove the lower hanging plate (7), clean the sealing component (13) at the bottom of the lower hanging plate (7), set lifting holes for the vertical part of the trapezoidal groove where the top support (8) and the bracket (12) are located and the top of the lower hanging plate (7), cut the side of the hanging plate (51) with its lifting hole near the upper floor slab (2), and form a more stable lifting system at the lifting hole at the hanging plate (51); lift gradually at the final cut of the upper support and the lower support, and then gradually complete the lifting.

2. The construction method for high-altitude demolition of prefabricated external cladding panels in high-rise buildings as described in claim 1, characterized in that, The upper floor slab (2) and the lower floor slab (3) are respectively connected to the upper beam (1) and the lower beam (4), and the upper floor slab (2) and the lower floor slab (3) are respectively thickened on the outside of the corresponding upper beam (1) and lower beam (4).

3. The construction method for high-altitude demolition of prefabricated external cladding panels in high-rise buildings as described in claim 1, characterized in that, The floor slab embedded part (52) is ∏-shaped, and at least half of the top plate of the floor slab embedded part (52) is fixedly connected to the embedded connecting plate; a pad can also be detachably provided between the hanging plate top connecting plate (53) and the embedded connecting plate, and the height of the pad is adapted to the height of the upper hanging plate (6) or the lower hanging plate (7) extending out of the top surface of the floor slab.

4. The construction method for high-altitude demolition of prefabricated external cladding panels in high-rise buildings as described in claim 1, characterized in that, The top connecting plate (53) of the hanging plate is inverted U-shaped and is snapped or pre-embedded on the upper hanging plate (6) or the lower hanging plate (7).

5. The construction method for high-altitude demolition of prefabricated external cladding panels in high-rise buildings as described in claim 1, characterized in that, An end corner piece (11) is fixedly connected to the outer corner of the lower floor slab (3). The end corner piece (11) is an inverted L-shaped piece. The horizontal part of the inverted L-shaped piece is flush with the top of the lower floor slab (3), and the vertical part of the inverted L-shaped piece is flush with the outer side of the lower floor slab (3). A corbel (12) is fixedly connected to the vertical part, and the top of the corbel (12) is fixedly connected to the top support plate (83).

6. The construction method for high-altitude demolition of prefabricated external cladding panels in high-rise buildings as described in claim 1, characterized in that, The bottom of the upper hanging plate (6) and the top of the lower hanging plate (7) are respectively set as stepped splicing seams. A board connector (15) is set on the outside of the splicing seam and a sealing component (13) is set in the middle. A fiberglass mat (16) is also set between the inside of the splicing seam and the upper floor slab (2) or the upper floor slab (2).

7. The construction method for high-altitude demolition of prefabricated external cladding panels in high-rise buildings as described in claim 1, characterized in that, Two hoisting fixing points are set up and fixed to the two ends of the upper opening of the outer window with hoisting rope (9). The firmness and spacing of the two fixing points are checked. To prevent the two hoisting points from shifting, the hoisting beam is processed in advance. The hoisting rope (9) is inserted from the gap between the top of the board and the structure and looped back for fixing.

8. The construction method for high-altitude demolition of prefabricated external cladding panels in high-rise buildings as described in claim 1, characterized in that, The lower hanging plate (7) is connected to the lower part of the bracket (12) by a connecting plate. It is pre-cut during the demolition construction. A buffer pad is also set between the lower hanging plate (7) and the top support plate (82). The buffer pad and sealing material are cleaned first, and the welded connection between the top support plate (82) and the lower hanging plate (7) is retained and cut.

9. The construction method for high-altitude demolition of prefabricated external cladding panels in high-rise buildings as described in claim 1, characterized in that, For the heavy and large-sized upper and lower hanging plates (6) and lower hanging plates (7), the plates are divided in the early stage using BIM and lifted out of the area. For the divided hanging plates, the lower part of the upper hanging plate (6) is cut first and the cut part is temporarily fixed and supported by mobile scaffolding. The upper part of the lower hanging plate (7) is cut first and the cut part is temporarily fixed and supported by mobile scaffolding.

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