Frame-body-support-free construction method for cantilever floor slab of super high-rise office building

Abstract

The invention provides a super high-rise office building cantilever floor slab frame-free supporting construction method, which relates to the technical field of cantilever floor slab construction, and comprises the steps of laying a simply supported floor support plate, mounting an angle steel bracket, laying a galvanized steel plate side formwork, constructing a cantilever floor slab and the like. According to the method, structural steel bars can be safely and efficiently installed and concrete can be poured under the condition that a traditional formwork supporting frame body is not erected at high altitude, and safe construction of the super high-rise steel-beam-support-free cantilever floor slab structure is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of cantilever floor construction, in particular to a frame-free support construction method for cantilevered floors of super high-rise office buildings. Background Art

[0002] With the increasing development of urban socio-economic development, newly constructed commercial complexes have become popular leisure, entertainment, and residential destinations for modern citizens. Super-high-rise office buildings are growing taller and taller, and most utilize a steel frame-core tube structure, offering novel and unique shapes and diverse forms. Currently, the outer frame structure of super-high-rise buildings often features cantilevered slabs outside the steel columns, without any cantilevered steel beam support. These cantilevered slabs can be elevated high above the ground, reaching up to 150 meters.

[0003] Traditional floor-mounted, buckled scaffolding presents numerous challenges, including high construction difficulty and safety risks. Wind loads at high altitudes are significant, and the cantilever slab supports are too close to the edge, resulting in poor vertical stability. Solving the construction challenges of high-altitude, unstructured steel beams supporting cantilever slabs is a technical topic worthy of research. Summary of the Invention

[0004] In response to the above-mentioned existing technologies, the present invention proposes a construction method for cantilevered floor slabs of super-high-rise office buildings without frame support, which can safely and efficiently install structural steel bars and pour concrete at high altitudes without setting up traditional formwork support frames, thereby ensuring the safe construction of super-high-rise cantilevered floor slab structures without steel beam support.

[0005] The present invention provides a method for constructing a cantilevered floor of a super high-rise office building without frame support, comprising the following steps: S1. Laying the simply supported floor deck: hoisting the structural steel columns and structural steel beams of the building, effectively connecting the structural steel columns and structural steel beams, welding studs on the top of the structural steel beams, and fixing the simply supported floor deck with the studs; S2. Installing angle steel brackets: Arrange several angle steel brackets along the span direction of the structural steel beam, wherein the angle steel brackets include horizontal angle steel and diagonal angle steel. Weld one end of the horizontal angle steel to one end of the diagonal angle steel, weld the other end of the horizontal angle steel to the upper flange of the structural steel beam, and weld the other end of the diagonal angle steel to the lower flange of the structural steel beam. S3. Laying galvanized steel side formwork: Extending the galvanized steel side formwork along the span direction of the structural steel beam, spot-welding one end of the galvanized steel side formwork to the upper chord steel bars of the cantilevered floor deck, and spot-welding the other end of the galvanized steel side formwork to the lower chord steel bars of the cantilevered floor deck or the upper flange of the structural steel beam; S4. Construction of cantilever floor slab: Install the main reinforcement of the cantilever floor slab and pour the concrete of the cantilever floor slab. After the concrete reaches the designed strength, remove the angle steel bracket and transfer it to other floors for application.

[0006] Preferably, in S2, the angle steel brackets are evenly arranged at intervals of no more than 750 mm along the span direction of the structural steel beam.

[0007] Preferably, in S2, the horizontal angle steel and the oblique angle steel are both L50*5.

[0008] Preferably, in S3, the overlap length of the cantilevered floor deck, the galvanized steel plate side formwork and the upper wing plate of the structural steel beam is not less than 50 mm.

[0009] Preferably, in S3, the bottom of the galvanized steel plate side mold is fixed to the horizontal angle steel by spot welding at intervals.

[0010] Preferably, in S4, the main reinforcement of the cantilevered floor slab extends into the simply supported floor deck for not less than La, and part of the main reinforcement of the cantilevered floor slab is welded and fixed to the outer edge of the structural steel column for not less than 10d.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a method for constructing cantilevered floor slabs of super-high-rise office buildings without frame support, which is suitable for super-high-rise buildings with steel frame and core tube. It can complete the reinforced concrete construction of high-altitude cantilevered floor slabs (without cantilevered steel beams) without setting up traditional formwork support frames, shortening the construction period, saving the cost of frame erection, avoiding the instability of the edge support frame, and ensuring the safety of high-altitude operations. At the same time, the temporary angle steel brackets of the cantilevered floor slabs have a high turnover rate, good environmental protection, meet the requirements of green construction, and are highly economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a plan view of a construction method for cantilevered floor slabs of super high-rise office buildings without frame support in an embodiment of the present invention.

[0013] Figure 2 、 3 Schematic cross-sectional view of a frame-free support construction method for cantilevered floors in super-high-rise office buildings according to an embodiment of the present invention.

[0014] In the figure: 1. Cantilever floor slab; 2. Cantilever floor decking; 3. Simply supported floor decking; 4. Structural steel beam; 5. Structural steel column; 6. Horizontal angle steel; 7. Core tube; 8. Galvanized steel plate side formwork; 9. Oblique angle steel; 10. Studs; 11. Main reinforcement of cantilever floor slab. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0016] Example: Figure 1-3 A construction method for cantilevered floor slabs of a super high-rise office building without frame support is shown, comprising the following steps: S1. Laying the simply supported floor deck: Hoist the building's structural steel columns 5 and structural steel beams 4, effectively connecting the structural steel columns (5) and structural steel beams 4. Weld studs 10 to the top of the structural steel beams 4 to secure the simply supported floor deck 3. Install steel wire ropes between the structural steel columns 5. During the construction of the cantilevered floor slab 1 and the pouring of concrete, workers will fasten their safety belts to the steel wire ropes.

[0017] S2. Install angle steel brackets: Arrange several angle steel brackets along the span direction of the structural steel beam 4. The angle steel brackets include horizontal angle steel 6 and oblique angle steel 9. Weld one end of the horizontal angle steel 6 to one end of the oblique angle steel 9, weld the other end of the horizontal angle steel 6 to the upper wing plate of the structural steel beam 4, and weld the other end of the oblique angle steel 9 to the lower wing plate of the structural steel beam 4. The angle steel brackets are evenly arranged at intervals of 750 mm along the span direction of the structural steel beam 4. Both the horizontal angle steel 6 and the oblique angle steel 9 are L50*5, and their ends are welded on the ground in advance to reduce high-altitude operations and ensure construction safety.

[0018] S3. Laying the galvanized steel plate side formwork: extending the galvanized steel plate side formwork 8 along the span direction of the structural steel beam 4, spot welding one end of the galvanized steel plate side formwork 8 to the upper chord steel bar of the cantilevered floor decking 2, and spot welding the other end of the galvanized steel plate side formwork 8 to the upper wing plate of the structural steel beam 4; the overlap length of the cantilevered floor decking 2, the galvanized steel plate side formwork 8 and the upper wing plate of the structural steel beam 4 is 50 mm; the bottom of the galvanized steel plate side formwork 8 is fixed to the horizontal angle steel 6 by spot welding at intervals.

[0019] S4. Construction of cantilever floor slab: Install the cantilever floor slab main reinforcement 11. The cantilever floor slab main reinforcement 11 extends into the simply supported floor slab 3 for La, and part of the cantilever floor slab main reinforcement 11 is welded and fixed to the outer edge of the structural steel column 5 for not less than 10d. Pour the concrete of the cantilever floor slab 1. During the process, avoid concentrated loading of concrete on the unformed cantilever floor slab 1. After the concrete reaches the design strength, remove the angle steel bracket and transfer it to other floors for application.

[0020] This embodiment can be used for the reinforcement and concrete construction of cantilevered floor slabs outside the structural steel beams of commercial complexes; the method is simple and practical to operate, stable and reliable, and highly safe. When there are no structural steel beams at the location of the cantilevered floor slab, there is no need to set up a high-rise scaffolding support, which shortens the construction period, saves bulk materials such as cantilevered vertical poles, horizontal poles and diagonal poles, and reduces the safety risks of high-altitude operations; temporary horizontal angle steels and temporary diagonal angle steels and other components are easy to install and remove, are conducive to recycling, meet green construction requirements, and are highly economical.

[0021] The above are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent solutions made using the contents of the present invention specification, directly or indirectly applied in other related technical fields, are also within the patent protection scope of the present invention.

Claims

1. A construction method for cantilevered floor slabs of super high-rise office buildings without frame support, characterized in that: The steps include: S1. Laying the simply supported floor deck: hoisting the structural steel columns (5) and the structural steel beams (4) of the building, effectively connecting the structural steel columns (5) and the structural steel beams (4), welding studs (10) on the top of the structural steel beams (4), and fixing the simply supported floor deck (3) through the studs (10); S2. Installing angle steel brackets: arranging a plurality of angle steel brackets along the span direction of the structural steel beam (4), wherein the angle steel brackets include a horizontal angle steel (6) and an oblique angle steel (9), welding one end of the horizontal angle steel (6) to one end of the oblique angle steel (9), welding the other end of the horizontal angle steel (6) to the upper wing plate of the structural steel beam (4), and welding the other end of the oblique angle steel (9) to the lower wing plate of the structural steel beam (4); S3. Laying galvanized steel plate side formwork: extending and arranging the galvanized steel plate side formwork (8) along the span direction of the structural steel beam (4), spot-welding one end of the galvanized steel plate side formwork (8) to the upper chord steel bar of the cantilevered floor decking (2), and spot-welding the other end of the galvanized steel plate side formwork (8) to the lower chord steel bar of the cantilevered floor decking (2) or the upper wing plate of the structural steel beam (4); S4. Construction of cantilevered floor slab: installing cantilevered floor slab main reinforcement (11), pouring cantilevered floor slab (1) concrete, after the concrete reaches the design strength, removing the angle steel bracket and transferring it to other floors for application.

2. The construction method for cantilevered floor slabs of super high-rise office buildings without frame support according to claim 1, characterized in that: In S2, the angle steel brackets are evenly arranged at intervals of no more than 750 mm along the span direction of the structural steel beam (4).

3. The construction method for cantilevered floor of a super high-rise office building without frame support according to claim 1 or 2, characterized in that: In S2, the horizontal angle steel (6) and the oblique angle steel (9) are both L50*5.

4. The construction method for cantilevered floor of a super high-rise office building without frame support according to claim 1 or 2, characterized in that: In S3, the overlap length of the cantilevered floor deck (2), the galvanized steel plate side form (8) and the upper wing plate of the structural steel beam (4) is not less than 50 mm.

5. The construction method for cantilevered floor of a super high-rise office building without frame support according to claim 1 or 2, characterized in that: In S3, the bottom of the galvanized steel plate side mold (8) is fixed to the horizontal angle steel (6) by spot welding at intervals.

6. The construction method for cantilevered floor of a super high-rise office building without frame support according to claim 1 or 2, characterized in that: In S4, the cantilevered floor slab main reinforcement (11) extends into the simply supported floor slab (3) by not less than La, and part of the cantilevered floor slab main reinforcement (11) is welded and fixed to the outer edge of the structural steel column (5) by not less than 10d.

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