Steel platform formwork retrofit method for in-flight reduction of core wall

Abstract

This invention provides a method for modifying a steel platform formwork for reducing the size of a core tube wall in mid-air, comprising the following steps: 1. Reducing the core tube wall size starting from the Nth floor, with the steel platform formwork located on the Nth floor; 2. Lifting the steel platform formwork to the N+1th floor and constructing the Nth floor core tube structure; 3. Constructing permanent enclosures on the top of the platform, and constructing first permanent and temporary enclosures at the edges of the remaining hanging scaffolding; 4. Dismantling the steel platform formwork and the hanging scaffolding to be dismantled in the area where the wall size was reduced; 5. Lifting the steel platform formwork to the N+2th floor, constructing second permanent enclosures at the edges of the remaining hanging scaffolding, and constructing the N+1th floor core tube structure; 6. Lifting the steel platform formwork to the N+3th floor, constructing third permanent enclosures at the edges of the remaining hanging scaffolding, and constructing the N+2th floor core tube structure. This invention relates to the field of high-rise building structure construction technology and solves the problem of the lack of a safe and efficient method for modifying steel platform formwork.

Description

Technical Field

[0001] This invention relates to the field of high-rise building structure construction technology, and in particular to a method for modifying a steel platform formwork to reduce the amount of core tube wall in the air. Background Technology

[0002] Steel platform formwork systems are widely used in the construction of core tube structures for high-rise and super high-rise buildings. When the core tube wall is reduced in mid-air, the steel formwork system in the area where the reduced core tube wall is located needs to be modified in mid-air. This involves removing the platform beams and hanging scaffolding at the bottom of the steel formwork system in the area where the core tube wall is located to adapt to the change in the shape of the core tube wall.

[0003] During actual construction, the partial dismantling of the lower scaffolding resulted in a lack of protection at the edges of the remaining lower scaffolding, necessitating the construction of an enclosure structure. However, carrying out the dismantling of the lower scaffolding and the installation of the enclosure structure at high altitudes without adequate protection poses significant safety hazards. Currently, there is no safe and efficient method for modifying steel platform formwork when reducing the core tube wall.

[0004] Therefore, there is a need for a method to modify steel platform formwork for reducing the size of the core tube wall in the air, which can solve the problem that there is no safe and efficient construction method for modifying steel platform formwork in the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a method for modifying steel platform formwork for reducing the size of core tube walls in the air, which can solve the problem that there is no safe and efficient construction method for modifying steel platform formwork in the prior art.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A method for modifying a steel platform formwork for reducing the size of the core tube wall in the air includes the following steps:

[0008] Step 1: After completing the construction of the core tube wall on the N-1th floor of the building structure, the core tube wall is reduced starting from the Nth floor of the building structure; at this time, the steel platform formwork is located on the Nth floor of the building structure;

[0009] Step 2: Lift the steel platform formwork to the N+1th floor of the building structure, and construct the Nth floor core tube structure. The Nth floor core tube structure has fewer walls than the core tube walls.

[0010] Step 3: Construct permanent retaining walls on the top of the platform on the steel platform formwork, and construct the first permanent retaining wall and temporary retaining walls at the edges of the remaining hanging scaffolding;

[0011] Step 4: Dismantle the steel platform formwork, platform beams, and hanging scaffolding to be dismantled in the reduced area of ​​the core tube wall;

[0012] Step 5: Lift the steel platform formwork to the N+2 floor of the building structure, construct the second permanent retaining wall at the edge of the remaining hanging scaffolding, and construct the N+1 floor core tube structure.

[0013] Step 6: Lift the steel platform formwork to the N+3 floor of the building structure, construct the third permanent retaining wall at the edge of the remaining hanging scaffold, and construct the core tube structure of the N+2 floor.

[0014] Step 3 includes the following sub-steps:

[0015] Step 3.1: Construct permanent enclosure for the top of the platform on the steel platform formwork;

[0016] Step 3.2: Divide the lower scaffolding into upper and lower layers, with the top surface of the core tube wall as the boundary;

[0017] Step 3.3: Construct permanent side scaffolding at the edges of the remaining suspended scaffolding;

[0018] Step 3.4: Construct the upper intermediate permanent retaining wall at the edge of the remaining lower scaffolding;

[0019] Step 3.5: Install several upper-level walkway boards at vertical intervals within the upper-level hanging scaffolding;

[0020] Step 3.6: Construct temporary retaining walls in the middle of the lower layer at the edge of the existing hanging scaffold.

[0021] In step 3.3, a pair of permanent side enclosures are located on both sides of the core tube wall, and the height of the permanent side enclosures covers the entire height of the lower scaffolding.

[0022] In step 3.4, the upper middle permanent enclosure is connected between a pair of side permanent enclosures, and the height of the upper middle permanent enclosure covers the height of the upper hanging scaffold.

[0023] In step 3.6, a pair of lower intermediate temporary enclosures are located on both sides of the core tube wall and are set between a pair of side permanent enclosures and the two sides of the core tube wall, and the height of the lower intermediate temporary enclosures covers the height of the lower hanging scaffolding.

[0024] Step 5 includes the following sub-steps:

[0025] Step 5.1: When the steel platform formwork is lifted to the N+2th floor of the building structure, the top surface of the core tube wall is located in the lower hanging scaffold. The lower hanging scaffold is divided into the first lower hanging scaffold located below and the second lower hanging scaffold located above, with the top surface of the core tube wall as the boundary.

[0026] Step 5.2: Remove the temporary retaining walls located within the second lower-level hanging scaffold, that is, the pair of lower-level intermediate temporary retaining walls located within the second lower-level hanging scaffold;

[0027] Step 5.3: Construct a second lower-level permanent retaining wall in the middle of the lower-level scaffolding at the edge of the existing lower scaffolding. The second lower-level permanent retaining wall in the middle is connected to a pair of side permanent retaining walls and the upper-level permanent retaining wall.

[0028] Step 5.4: Install several walkways for the second lower-level suspended scaffolding at vertical intervals within the second lower-level suspended scaffolding;

[0029] Step 5.5: Construct the N+1th layer core tube structure.

[0030] In step 5.3, the height of the permanent enclosure in the middle of the second lower-level hanging scaffold covers the height of the second lower-level hanging scaffold.

[0031] Step 6 includes the following sub-steps:

[0032] Step 6.1: When the steel platform formwork is lifted to the N+3rd floor of the building structure, the top surface of the core tube wall is located below the lower-level hanging scaffolding;

[0033] Step 6.2: Remove the temporary retaining walls located within the first lower-level hanging scaffold, that is, the pair of lower-level intermediate temporary retaining walls located within the first lower-level hanging scaffold;

[0034] Step 6.3: Construct the first lower-level lower-level permanent retaining wall at the edge of the existing lower-level scaffolding. The first lower-level lower-level permanent retaining wall is connected to a pair of side permanent retaining walls and the second lower-level lower-level permanent retaining wall.

[0035] Step 6.4: Install several walkways for the first lower-level suspended scaffolding at vertical intervals within the first lower-level suspended scaffolding;

[0036] Step 6.5: Construct the N+2th layer core tube structure and complete the high-altitude modification of the steel platform formwork.

[0037] In step 6.3, the height of the permanent enclosure in the middle of the first lower-level hanging scaffold covers the height of the first lower-level hanging scaffold.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. Because the present invention is equipped with a first permanent enclosure and a temporary enclosure, before the steel platform formwork, its platform beams and the lower scaffolding are dismantled, the first permanent enclosure and the temporary enclosure have formed protection at the edge of the remaining lower scaffolding, ensuring the safety of the dismantling construction of the steel platform formwork, its platform beams and the lower scaffolding, and greatly reducing the safety hazards of high-altitude modification operations of the steel platform formwork.

[0040] 2. Because the present invention is equipped with a second permanent enclosure and a third permanent enclosure, after each lifting of the steel platform formwork, only a small amount of temporary enclosure at the corresponding position needs to be replaced with the second permanent enclosure and the third permanent enclosure as the lifting height increases, and the walkway slab can be constructed, which effectively reduces the risk of high-altitude modification operations of the steel platform formwork.

[0041] 3. The modification method of the present invention can be carried out simultaneously with the construction of the core tube structure, with fast construction speed and high safety. It can dismantle the steel platform formwork, platform beams and hanging scaffolding to be dismantled in the reduced part of the core tube wall at one time, which solves the problem that there is no safe and efficient steel platform formwork modification construction method in the prior art. It can be applied to the construction of various irregular core tube wall reductions. Attached Figure Description

[0042] The above and other objects, features and advantages of this disclosure will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0043] Figure 1 This is a construction cross-sectional view of the steel platform formwork modification method for reducing the core tube wall in the air according to the present invention (the steel platform formwork is located on the Nth floor).

[0044] Figure 2 yes Figure 1 Sectional view of AA in the middle;

[0045] Figure 3 This is a construction cross-sectional view of the steel platform formwork modification method for reducing the core tube wall in the air according to the present invention (the steel platform formwork is located on the N+1th floor, and the core tube structure is being constructed on the Nth floor).

[0046] Figure 4 yes Figure 3 Cross-sectional view of the middle section (BB);

[0047] Figure 5 This is a construction cross-sectional view of the steel platform formwork modification method for reducing the size of the core tube wall in the air according to the present invention (the steel platform formwork is located on the N+1th floor, during the construction of the first permanent enclosure and temporary enclosure).

[0048] Figure 6 yes Figure 5CC section view;

[0049] Figure 7 This is a construction cross-sectional view of the method for modifying the steel platform formwork for reducing the size of the core tube wall in the air according to the present invention (the steel platform formwork is located on the N+1th floor, and the scaffolding to be dismantled is being removed).

[0050] Figure 8 This is a construction cross-sectional view of the steel platform formwork modification method for reducing the core tube wall in the air according to the present invention (the steel platform formwork is located on the N+2th floor, during the construction of the second permanent enclosure).

[0051] Figure 9 yes Figure 8 Cross-sectional view of DD in the middle;

[0052] Figure 10 This is a construction cross-sectional view of the steel platform formwork modification method for reducing the core tube wall in the air according to the present invention (the steel platform formwork is located on the N+3rd floor).

[0053] Figure 11 yes Figure 10 Cross-sectional view of EE.

[0054] In the diagram: 1-Steel platform formwork; 2-Scaffolding to be dismantled; 3-Core tube wall; 4-Nth layer core tube structure; 5-Permanent enclosure at the top of the platform; 6-Permanent enclosure on the sides; 7-Upper layer middle permanent enclosure; 8-Upper layer walkway; 9-Lower layer middle temporary enclosure; 10-Second lower layer lower scaffolding middle permanent enclosure; 11-Second lower layer lower scaffolding walkway; 12-N+1th layer core tube structure; 13-First lower layer lower scaffolding middle permanent enclosure; 14-First lower layer lower scaffolding walkway; 15-N+2th layer core tube structure; 16-Retained lower scaffolding. Detailed Implementation

[0055] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the steel platform formwork modification method for reducing the size of the core tube wall in the air proposed by this invention. The advantages and features of this invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this invention.

[0056] Please see the appendix Figure 1 To be continued Figure 11 A method for modifying a steel platform formwork for reducing the size of the core tube wall in the air includes the following steps:

[0057] Please see the appendix Figure 1 and attached Figure 2Step 1: After the construction of the core tube wall 3 of the N-1th floor (N>1) of the building structure is completed, the wall of the core tube wall 3 is reduced from the Nth floor of the building structure; at this time, the steel platform formwork 1 is located on the Nth floor of the building structure, and the lower scaffolding at the bottom of the steel platform formwork 1 extends downward to the floor slab of the N-2th floor of the building structure.

[0058] The core tube wall 3 from the 1st floor to the N-1th floor can be completed using conventional core tube construction techniques. The construction process will not be described in detail here. Only the modification process of the steel platform formwork 1, its platform beams and the hanging scaffolding when the core tube wall 3 is reduced will be described in detail.

[0059] The lower scaffolding includes the lower scaffolding 2 to be dismantled and the lower scaffolding 16 to be retained. The lower scaffolding 2 to be dismantled is located in the area where the core tube wall 3 is reduced, and the remaining lower scaffolding is the lower scaffolding 16 to be retained.

[0060] Please see the appendix Figure 3 and attached Figure 4 Step 2: The steel platform formwork 1 is lifted as a whole to the N+1th floor of the building structure using a hydraulic climbing system. The Nth floor core tube structure 4 is constructed with a smaller portion of the wall compared to the core tube wall 3.

[0061] According to the design requirements of the core tube, the Nth layer core tube structure 4 is only reduced in part from the core tube wall 3. The Nth layer core tube structure 4 can be constructed using the conventional construction procedures for the core tube, which will not be elaborated here.

[0062] After the construction of the Nth layer core tube structure 4, due to the reduction in the wall portion of the core tube wall 3, it is necessary to dismantle the steel platform formwork 1, its platform beams, and the lower scaffolding 2 to be dismantled in the area where the wall portion was reduced. Furthermore, to ensure the construction safety on the remaining lower scaffolding 16, a retaining structure needs to be constructed at the edges of the remaining lower scaffolding 16.

[0063] Please see the appendix Figure 5 and attached Figure 6 Step 3: Construct the permanent top retaining wall 5 on the steel platform formwork 1. Construct the first permanent retaining wall and temporary retaining wall at the junction of the lower scaffold 2 to be dismantled and the retained lower scaffold 16, i.e. the edge of the retained lower scaffold 16.

[0064] The permanent retaining wall 5 on the top of the platform is located at the junction of the dismantled and retained parts of the steel platform formwork 1. The construction of the permanent retaining wall 5 on the top of the platform is used to ensure the construction safety on the steel platform formwork 1. The construction of the first permanent retaining wall and the temporary retaining wall is used to ensure the construction safety on the retained lower scaffolding 16, which facilitates the subsequent dismantling of the steel platform formwork 1 and the lower scaffolding 2 to be dismantled, as well as the subsequent construction of the core tube structure.

[0065] Step 3 includes the following sub-steps:

[0066] Step 3.1: Construct the permanent enclosure 5 on the top of the platform on the steel platform formwork 1.

[0067] The permanent enclosure 5 at the top of the platform can be a fence structure formed by horizontal bars and vertical bars, or other enclosure structures can be used according to protection requirements, which will not be elaborated here.

[0068] Step 3.2: Divide the lower scaffolding into upper and lower layers, with the top surface of the core tube wall 3 as the boundary;

[0069] The upper-level hanging scaffold is located above the core tube wall 3, forming a void without wall cover. The lower-level hanging scaffold is located within the height range of the core tube wall 3, partially covered by the wall. The uncovered voids in the hanging scaffold can be closed by the first permanent enclosure and temporary enclosure to prevent personnel or equipment from falling during construction.

[0070] Step 3.3: At the junction of the lower scaffold 2 to be dismantled and the lower scaffold 16 to be retained, i.e. the edge of the retained lower scaffold 16, construct the side permanent retaining wall 6. A pair of side permanent retaining walls 6 are located on both sides of the core tube wall 3, and the height of the side permanent retaining walls 6 covers the entire height of the lower scaffold.

[0071] Based on the actual working conditions such as the width of the core tube wall 3 and the construction space, a pair of permanent side enclosures 6 are set on both sides of the core tube wall 3 as permanent enclosure structures.

[0072] The permanent side enclosure 6 can be a fence structure formed by horizontal bars and vertical bars, or other enclosure structures can be used according to protection requirements, which will not be elaborated here.

[0073] Step 3.4: At the junction of the lower scaffold 2 to be dismantled and the lower scaffold 16 to be retained, i.e., at the edge of the retained lower scaffold 16, construct the upper intermediate permanent retaining wall 7. The upper intermediate permanent retaining wall 7 is connected between a pair of side permanent retaining walls 6, and the height of the upper intermediate permanent retaining wall 7 covers the height of the upper lower scaffold.

[0074] Based on the spacing between a pair of side permanent enclosures 6, the upper middle permanent enclosure 7 is set on a pair of side permanent enclosures 6 as the edge permanent enclosure structure of the retained lower hanging scaffold 16. The top of the upper middle permanent enclosure 7 is connected to the bottom of the steel platform formwork 1, and the bottom of the upper middle permanent enclosure 7 extends to the top surface of the core tube wall 3 to ensure the closure of the edge of the upper lower hanging scaffold.

[0075] The upper middle permanent enclosure 7 can be a fence structure formed by horizontal bars and vertical bars, or other enclosure structures can be adopted according to protection requirements, which will not be elaborated here.

[0076] Step 3.5: Install several upper walkway slabs 8 vertically at intervals within the upper-level hanging scaffolding.

[0077] An appropriate number of upper walkway slabs 8 are to be set according to construction needs. The upper walkway slabs 8 can be made of steel plates.

[0078] Preferably, the lower scaffolding can be divided into 6 layers from bottom to top. The height of the first layer of the building structure is equal to the height of the second layer of the lower scaffolding. The upper layer of lower scaffolding consists of 4-6 layers. Three upper walkway boards 8 are evenly spaced inside the upper layer of lower scaffolding to provide construction walkways and platform space. The lower layer of lower scaffolding consists of 1-3 layers.

[0079] Step 3.6: At the junction of the lower scaffolding 2 to be dismantled and the retained lower scaffolding 16, i.e. the edge of the retained lower scaffolding 16, construct the lower intermediate temporary retaining 9. The pair of lower intermediate temporary retaining 9 are located on both sides of the core tube wall 3 and are set between the pair of side permanent retaining 6 and the two sides of the core tube wall 3. The height of the lower intermediate temporary retaining 9 covers the height of the lower lower scaffolding.

[0080] The lower intermediate temporary enclosure 9 can be a fence structure formed by horizontal bars and vertical bars, or other enclosure structures can be used according to protection requirements, which will not be elaborated here.

[0081] The upper intermediate permanent enclosure 7 and a pair of side permanent enclosures 6 serve as the first permanent enclosure, and a pair of lower intermediate temporary enclosures 9 serve as temporary enclosures. The lower intermediate temporary enclosures 9 are used to temporarily seal the gap between the core tube wall 3 and the side permanent enclosures 6 to ensure construction safety.

[0082] The first permanent enclosure can be fixed by welding or other methods to ensure the integrity and strength of the structure. The temporary enclosure can be connected to the first permanent enclosure by bolts or other detachable methods, which ensures a firm and reliable connection while facilitating disassembly later.

[0083] Please see the appendix Figure 7 Step 4: Remove the steel platform formwork 1 and its platform beams (not shown in the figure) of the reduced area of ​​the core tube wall 3 and the hanging scaffold 2 to be removed.

[0084] After the construction of the permanent enclosure 5, the first permanent enclosure and the temporary enclosure on the top of the platform is completed, the safety of the dismantling operation of the steel platform formwork 1 and its platform beams and the scaffolding 2 to be dismantled in the reduced area of ​​the core tube wall 3 can be guaranteed. The steel platform formwork 1 and its platform beams and the scaffolding 2 to be dismantled can be dismantled in a conventional manner, which will not be elaborated here.

[0085] Please see the appendix Figure 8 and attached Figure 9Step 5: The steel platform formwork 1 is lifted as a whole to the N+2 floor of the building structure using a hydraulic climbing system. At the junction of the lower scaffold 2 to be dismantled and the lower scaffold 16 to be retained, i.e. the edge of the retained lower scaffold 16, the second permanent retaining structure is constructed. The core tube structure 12 of the N+1 floor is constructed.

[0086] After the steel platform formwork 1 is raised, the top surface of the core tube wall 3 drops relative to the upper intermediate permanent retaining wall 7, forming a void at the edge of the retained lower scaffold 16. This void needs to be sealed by the second permanent retaining wall to ensure the construction safety on the lower scaffold 16.

[0087] Step 5 includes the following sub-steps:

[0088] Step 5.1: When the steel platform formwork 1 is lifted to the N+2th floor of the building structure, the top surface of the core tube wall 3 is located in the lower-level hanging scaffold. The lower-level hanging scaffold is divided into the first lower-level hanging scaffold located below and the second lower-level hanging scaffold located above, with the top surface of the core tube wall 3 as the boundary.

[0089] As the steel platform formwork 1 is raised by 1 floor, the first lower-level hanging scaffold is located on the first floor of the retained hanging scaffold 16, and the second lower-level hanging scaffold is located on the second-third floor of the retained hanging scaffold 16.

[0090] Step 5.2: Remove the temporary retaining walls located within the second lower-level hanging scaffold, namely the pair of lower-level intermediate temporary retaining walls 9 located within the second lower-level hanging scaffold.

[0091] Step 5.3: At the junction of the lower scaffold 2 to be dismantled and the retained lower scaffold 16, i.e., at the edge of the retained lower scaffold 16, construct the second lower-level lower scaffold intermediate permanent retaining wall 10. The second lower-level lower scaffold intermediate permanent retaining wall 10 is connected to a pair of side permanent retaining walls 6 and the upper intermediate permanent retaining wall 7, and the height of the second lower-level lower scaffold intermediate permanent retaining wall 10 covers the height of the second lower-level lower scaffold.

[0092] The temporary retaining wall 9 in the middle of the second-lower layer of the lower hanging scaffolding (i.e., the retained lower hanging scaffolding 16) is removed and replaced with the permanent retaining wall 10 in the middle of the second lower hanging scaffolding. The permanent retaining wall 10 in the middle of the second lower hanging scaffolding is used to close the hole formed by the lifting steel platform formwork 1, and the edges of the retained lower hanging scaffolding 16 are closed as the construction progresses.

[0093] The permanent retaining structure 10 in the middle of the second lower-level suspended scaffolding can be a fence structure formed by horizontal bars and vertical bars, or other retaining structures can be used according to protection requirements, which will not be elaborated here. The permanent retaining structure 10 in the middle of the second lower-level suspended scaffolding serves as the second permanent retaining structure.

[0094] Step 5.4: Install several walkways 11 of the second lower-level hanging scaffolding vertically at intervals within the second lower-level hanging scaffolding.

[0095] The number of second lower-level hanging scaffold walkways 11 can be adjusted according to construction needs. The second lower-level hanging scaffold walkways 11 can be made of steel plates. Since the second lower-level hanging scaffold is located on the 2nd-3rd level of the retained hanging scaffold 16, two second lower-level hanging scaffold walkways 11 are set at intervals to provide construction walkways and platform space.

[0096] Step 5.5: Construct the N+1th layer core tube structure 12.

[0097] Continue construction of the N+1th core tube structure 12 on the Nth core tube structure 4. The N+1th core tube structure 12 can be constructed using the conventional construction procedures for core tubes, which will not be elaborated here.

[0098] Please see the appendix Figure 10 and attached Figure 11 Step 6: The steel platform formwork 1 is lifted as a whole to the N+3 floor of the building structure using a hydraulic climbing system. At the junction of the lower scaffold 2 to be dismantled and the retained lower scaffold 16, i.e. the edge of the retained lower scaffold 16, the third permanent retaining structure is constructed. The core tube structure 15 of the N+2 floor is constructed.

[0099] As the steel platform formwork 1 continues to be raised, voids still form at the edges of the remaining lower scaffolding 16. These voids need to be sealed off by a third permanent enclosure to ensure the safety of construction on the lower scaffolding 16.

[0100] Step 6 includes the following sub-steps:

[0101] Step 6.1: When the steel platform formwork 1 is lifted to the N+3rd floor of the building structure, the top surface of the core tube wall 3 is located below the lower scaffolding.

[0102] As the steel platform formwork 1 is raised by one floor, the lower scaffolding is raised to above the top surface of the core tube wall 3.

[0103] Step 6.2: Remove the temporary retaining walls located within the first lower-level hanging scaffold, namely the pair of lower-level intermediate temporary retaining walls 9 located within the first lower-level hanging scaffold.

[0104] Step 6.3: At the junction of the lower scaffold 2 to be dismantled and the retained lower scaffold 16, i.e., at the edge of the retained lower scaffold 16, construct the first lower-level lower scaffold intermediate permanent retaining wall 13. The first lower-level lower scaffold intermediate permanent retaining wall 13 is connected to a pair of side permanent retaining walls 6 and the second lower-level lower scaffold intermediate permanent retaining wall 10, and the height of the first lower-level lower scaffold intermediate permanent retaining wall 13 covers the height of the first lower-level lower scaffold.

[0105] The temporary retaining wall 9 in the middle of the first lower layer of the lower scaffolding (i.e., the retained lower scaffolding 16) is removed and replaced with the permanent retaining wall 13 in the middle of the first lower layer of the lower scaffolding. The permanent retaining wall 13 in the middle of the first lower layer of the lower scaffolding closes the opening formed by the lifting steel platform formwork 1, and closes the edge of the retained lower scaffolding 16 as the construction progresses.

[0106] The permanent enclosure 13 in the middle of the first lower-level suspended scaffolding can be a fence structure formed by horizontal bars and vertical bars, or other enclosure structures can be used according to protection requirements, which will not be elaborated here. The permanent enclosure 13 in the middle of the first lower-level suspended scaffolding.

[0107] Step 6.4: Install several walkways 14 of the first lower-level hanging scaffolding at vertical intervals within the first lower-level hanging scaffolding.

[0108] Preferably, the first lower layer of hanging scaffold walkway 14 can be set up in one layer, located at the bottom of the first lower layer of hanging scaffold, to provide construction walkway and platform space. The number of first lower layer hanging scaffold walkway 14 can also be increased according to actual construction needs.

[0109] Step 6.5: Construct the N+2th layer core tube structure 15 and complete the high-altitude modification of the steel platform formwork 1.

[0110] On the N+1th core tube structure 12, the N+2nd core tube structure 15 is constructed. The N+2nd core tube structure 15 can be constructed using the conventional construction procedures for core tubes, which will not be described in detail here.

[0111] At this point, the core tube wall 3 is separated from the retained hanging scaffold 16, and the high-altitude modification of the steel platform formwork 1 is completed. The conventional process can then be used to continue the construction of the upper core tube structure. If the wall of the upper core tube structure continues to be reduced, the above method can be repeated at the location where the wall is reduced to realize the high-altitude modification of the steel platform formwork 1, so that the steel platform formwork 1 and the hanging scaffold can adapt to core tube structures of different sizes.

[0112] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A method for in-flight retrofitting of a steel platform formwork for a core wall, characterized in that, Includes the following steps: Step 1: After the construction of the core tube wall (3) of the N-1th floor of the building structure is completed, the core tube wall (3) is reduced from the Nth floor of the building structure. At this time, the steel platform formwork (1) is located on the Nth floor of the building structure, and the lower scaffolding at the bottom of the steel platform formwork (1) extends downward to the floor slab of the N-2th floor of the building structure. Wherein, N is a positive integer greater than 1. The lower scaffolding includes the lower scaffolding to be dismantled (2) and the lower scaffolding to be retained (16). The lower scaffolding to be dismantled (2) is located in the area where the core tube wall (3) is reduced, and the remaining lower scaffolding is the lower scaffolding to be retained (16). Step 2: Lift the steel platform formwork (1) to the N+1 floor of the building structure and construct the Nth floor core tube structure (4). The Nth floor core tube structure (4) has a smaller core tube wall (3) than the N+1 floor core tube structure. Step 3: Construct permanent retaining wall (5) on the top of the steel platform formwork (1), and construct the first permanent retaining wall and temporary retaining wall at the junction of the lower scaffolding (2) to be dismantled and the retained lower scaffolding (16), i.e. the edge of the retained lower scaffolding (16). Step 4: Remove the steel platform formwork (1) and its platform beams and the hanging scaffolding (2) to be removed from the core tube wall (3) area. Step 5: Lift the steel platform formwork (1) to the N+2 floor of the building structure. After lifting the steel platform formwork (1), the top surface of the core tube wall (3) will drop relative to the upper middle permanent retaining wall (7), forming a hole at the edge of the retained lower scaffolding (16). The hole needs to be sealed by the second permanent retaining wall to ensure the construction safety on the lower scaffolding (16). The second permanent retaining wall is constructed at the edge of the retained lower scaffolding (16), and the core tube structure (12) of the N+1 floor is constructed. Step 6: Lift the steel platform formwork (1) to the N+3 floor of the building structure. As the steel platform formwork (1) continues to be lifted, a void is formed at the edge of the remaining hanging scaffold (16). The void needs to be sealed by the third permanent enclosure to ensure the construction safety on the hanging scaffold (16). The third permanent enclosure is constructed at the edge of the remaining hanging scaffold (16), and the core tube structure (15) of the N+2 floor is constructed. Step 3 includes the following sub-steps: Step 3.1: Construct permanent enclosure (5) on the top of the platform on the steel platform formwork (1); Step 3.2: Divide the hanging scaffold into upper hanging scaffold and lower hanging scaffold, with the top surface of the core tube wall (3) as the boundary; Step 3.3: Construct permanent side protection (6) at the edge of the retained hanging scaffold (16); Step 3.4: Construct the upper intermediate permanent retaining wall (7) at the edge of the retained lower scaffolding (16); Step 3.5: Install several upper walkway boards (8) vertically at intervals inside the upper hanging scaffolding; Step 3.6: Construct the lower intermediate temporary enclosure (9) at the edge of the retained hanging scaffold (16); In step 3.3, a pair of permanent side enclosures (6) are located on both sides of the core tube wall (3), and the height of the permanent side enclosures (6) covers the entire height of the hanging scaffold. In step 3.4, the upper middle permanent enclosure (7) is connected between a pair of side permanent enclosures (6), and the height of the upper middle permanent enclosure (7) covers the height of the upper hanging scaffold. In step 3.6, a pair of lower intermediate temporary enclosures (9) are located on both sides of the core tube wall (3) and set between a pair of side permanent enclosures (6) and the two sides of the core tube wall (3), and the height of the lower intermediate temporary enclosures (9) covers the height of the lower hanging scaffold.

2. The method for modifying a steel platform formwork for reducing the size of the core tube wall in mid-air as described in claim 1, characterized in that, Step 5 includes the following sub-steps: Step 5.1: When the steel platform formwork (1) is lifted to the N+2th floor of the building structure, the top surface of the core tube wall (3) is located in the lower hanging scaffold. The lower hanging scaffold is divided into the first lower hanging scaffold located below and the second lower hanging scaffold located above, with the top surface of the core tube wall (3) as the boundary. Step 5.2: Remove the temporary retaining walls located in the second lower layer of the hanging scaffolding, that is, the pair of lower intermediate temporary retaining walls located in the second lower layer of the hanging scaffolding (9). Step 5.3: Construct a second lower-level lower-level permanent retaining wall (10) at the edge of the existing lower-level scaffolding (16). The second lower-level lower-level permanent retaining wall (10) is connected to a pair of side permanent retaining walls (6) and the upper-level permanent retaining wall (7). Step 5.4: Install several walkways (11) of the second lower-level hanging scaffolding at vertical intervals within the second lower-level hanging scaffolding. Step 5.5: Construct the N+1th layer core tube structure (12).

3. The method for modifying a steel platform formwork for reducing the size of the core tube wall in mid-air as described in claim 2, characterized in that, In step 5.3, the height of the permanent retaining wall (10) in the middle of the second lower layer hanging scaffold covers the height of the second lower layer hanging scaffold.

4. The method for modifying a steel platform formwork for reducing the size of the core tube wall in mid-air as described in claim 1, characterized in that, Step 6 includes the following sub-steps: Step 6.1: When the steel platform formwork (1) is lifted to the N+3 floor of the building structure, the top surface of the core tube wall (3) is located below the lower scaffolding of the lower floor; Step 6.2: Remove the temporary retaining walls located in the first lower layer of the hanging scaffolding, that is, the pair of lower intermediate temporary retaining walls located in the first lower layer of the hanging scaffolding (9). Step 6.3: Construct the first lower-level lower-level permanent retaining wall (13) at the edge of the retained lower-level scaffolding (16), and connect the first lower-level lower-level permanent retaining wall (13) with a pair of side permanent retaining walls (6) and the second lower-level lower-level permanent retaining wall (10). Step 6.4: Install several walkways (14) of the first lower-level hanging scaffolding at vertical intervals within the first lower-level hanging scaffolding. Step 6.5: Construct the N+2th layer core tube structure (15) and complete the high-altitude transformation of the steel platform formwork (1).

5. The method for modifying a steel platform formwork for reducing the size of the core tube wall in mid-air as described in claim 4, characterized in that, In step 6.3, the height of the permanent retaining wall (13) in the middle of the first lower-level hanging scaffold covers the height of the first lower-level hanging scaffold.

Images