A concealed stairwell leading to the rooftop

Abstract

The present invention belongs to the technical field of construction engineering and relates to a concealed stairwell leading to the roof, comprising: a double-run staircase and a raised beam on the roof ground. The upper flight and the lower flight of the double-run staircase are connected by a landing. The upper end of the upper flight is connected to the roof ground, and the lower end of the lower flight is connected to the top floor ground. An open roof exit is provided directly above the upper flight. The raised beam on the roof ground surrounds the roof exit on the roof ground. The top of the raised beam on the roof ground is 30-50 cm higher than the roof ground. A sump is provided at the connection between the landing and the upper flight. By removing the existing stairwell on the roof and surrounding the open roof exit with the raised beam on the roof ground, the present invention reduces the height of the roof exit above the roof to below the parapet height, thus meeting the height limit requirements of the building roof.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering and relates to a stairwell that is concealed and exits to the roof of a building. Background Art

[0002] According to Article 5.5.3 of the "Code for Fire Protection Design of Buildings" GB 50016-2014, it is stipulated that "the stairwells of a building should preferably lead to the roof, and the doors or windows leading to the roof should open outwards". According to the above code regulations, the existing technologies all adopt enclosed stairwells that extend out to the large roof to meet the requirements such as waterproofing and fire protection of the stairwells.

[0003] However, in some buildings located in special height-limited areas, the protrusion of the stairwell above the roof will exceed the height limit requirements, which has a significant impact on the implementation of the project. Moreover, according to Article 6.4.1.1 of the "Code for Fire Protection Design of Buildings" GB 50016-2014, it is stipulated that "the stairwell should be able to have natural lighting and natural ventilation and should preferably be set against an exterior wall". To meet the code requirements, the stairwell is generally set against an exterior wall, which will form a local building on the roof that significantly protrudes above the large roof, damaging the overall exterior facade image. At the same time, if there are a large number of stairwells exiting to the roof, the combined increased area will be relatively large, occupying the above-ground building area and the floor area ratio index.

[0004] Obviously, the existing method of building a stairwell with a height of one floor of a building protruding above the roof on the roof is increasingly difficult to meet the requirements of height limit, lighting and ventilation, and floor area ratio. Therefore, a new way of connecting the stairs to the roof is needed to solve the above problems. Summary of the Invention

[0005] The technical solution adopted by the present invention to solve the technical problems is as follows: a concealed stairwell that exits to the roof, including: a double-run staircase and a raised beam on the roof ground. The double-run staircase is divided into an upper flight and a lower flight. The upper flight and the lower flight are connected by a landing. The upper end of the upper flight is connected to the ground of the roof, and the lower end of the lower flight is connected to the ground of the top floor. An open roof exit is provided directly above the upper flight. The raised beam on the roof ground surrounds the roof exit on the ground of the roof, and the top of the raised beam on the roof ground is 30-50 cm higher than the ground of the roof;

[0006] A sump is provided at the connection between the landing and the upper flight. The upper edge of the sump is flush with the ground of the landing. The sump is covered with a grid-shaped cover plate, and the bottom of the sump is connected to the municipal rainwater drainage network through a rainwater pipe;

[0007] A rooftop staircase platform is provided at the connection between the upper staircase and the ground of the roof. The rooftop staircase platform is flush with the top of the upper beam on the roof ground, and the steps of the upper staircase are butted against the rooftop staircase platform. The height of the ground exposed from the roof in the stairwell is only the height of the upper beam on the roof ground, which is still below the height of the roof parapet, thus meeting the requirement for the height limit of the roof. Since the upper beam on the roof ground is higher than the ground of the roof, rainwater or accumulated water on the roof will not flow back into the upper staircase. At the same time, a sump is provided at the rest platform to prevent rainwater from falling from the open-air roof outlet into the upper staircase, causing water accumulation or flowing into the ground on the top floor.

[0008] Preferably, a guardrail is provided on the upper beam on the roof, and the guardrail is not higher than the height of the parapet on the roof. The guardrail is used to prevent people on the roof from accidentally going to the open-air roof exit and causing personal injury. At the same time, the guardrail is not higher than the height of the parapet, meeting the height limit requirement.

[0009] Preferably, safety handrails are provided on both sides of the upper stair section, and the safety handrails are used for pedestrians to hold on to when walking up and down the upper stair section.

[0010] Preferably, the steps of the upper staircase are all provided with a first slope, with the bottom of the first slope facing the direction of the rest platform. The first slope prompts rainwater on the upper staircase to flow quickly into the sump to prevent water accumulation on the stairs.

[0011] Preferably, the rooftop staircase platform is provided with a second slope, with the top of the second slope facing the direction of the rest platform. The second slope prompts rainwater on the rooftop staircase platform to flow quickly to the ground on the rooftop, thereby preventing water accumulation on the rooftop staircase platform.

[0012] Preferably, an outer step is provided on the outer side of the connection between the roof ground upper beam and the roof staircase platform to connect the roof ground upper beam and the roof ground. The outer step and the roof staircase platform are respectively located on the inner and outer sides of the same section of the roof ground upper beam to facilitate pedestrian passage. The outer step is used to facilitate pedestrians to go up and down when the height difference between the roof ground upper beam and the roof ground is too large.

[0013] Preferably, the rest platform is provided with a rooftop outer door to separate indoor and outdoor, and the sump is located outside the rooftop outer door; the rooftop outer door is used for fire prevention and theft prevention, and prevents hot and cold air outside the roof from entering the room.

[0014] More preferably, a threshold is provided at the bottom of the roof outer door, the height of the threshold is 10 to 15 cm, the threshold is prefabricated with reinforced concrete, the threshold isolates the indoor and outdoor ground, prevents rainwater from seeping into the top floor room along the cover plate, and does not cause too much impact on pedestrians.

[0015] Preferably, a waterproof layer is provided at the connection between the periphery of the upper flip beam on the roof ground and the roof ground, and the waterproof layer is used to prevent rainwater or accumulated water on the roof from seeping into the joint between the periphery of the upper flip beam on the roof ground and the roof ground.

[0016] Preferably, a thermal insulation layer is sprayed or pasted on the bottom of the open part of the staircase; meanwhile, the thermal insulation layer extends from the open part to the non-open part to ensure that the open part of the staircase does not have a great impact on the indoor thermal insulation performance.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. By removing the staircase in the roof of the prior art and using the up-turned beam on the roof ground to surround the open roof exit, the height of the roof exit above the roof is reduced below the height of the parapet, so that the height limit requirement of the building roof is met.

[0019] 2. By setting a sump in the rest platform and making the up-turned beam on the roof ground higher than the roof ground, rainwater or accumulated water is prevented from flowing back into the top floor indoor due to the open roof exit.

[0020] 3. By adding a guardrail on the up-turned beam on the roof ground, pedestrians are prevented from being injured due to accidentally walking into the open roof exit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an elevation sectional view of a concealed staircase leading to the roof;

[0022] Figure 2 is Figure 1 the top view cross-sectional view of A-A of

[0023] Figure 3 is Figure 1 the top view cross-sectional view of B-B of

[0024] Figure 4 is Figure 1 the partial enlarged view of area C of

[0025] In the figure, 1. Double-run staircase; 2. Up-turned beam on the roof ground; 3. Upper flight; 4. Lower flight; 5. Rest platform; 6. Roof; 7. Top floor; 8. Roof exit; 9. Sump; 10. Cover plate; 11. Rainwater pipe; 12. Roof staircase platform; 13. Guardrail; 14. Safety handrail; 15. First slope; 16. Second slope; 17. Outer step; 18. Outer door on the roof; 19. Threshold; 20. Waterproof layer; 21. Thermal insulation layer. DETAILED DESCRIPTION OF THE INVENTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the relevant technologies in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] refer to Figures 1 to 4 A concealed staircase for exiting the roof, comprising a double-tread staircase 1 and a roof ground upturned beam 2. The double-tread staircase 1 is divided into an upper staircase section 3 and a lower staircase section 4. The upper staircase section 3 and the lower staircase section 4 are connected via a rest platform 5. The upper end of the upper staircase section 3 is connected to the ground of the roof 6, and the lower end of the lower staircase section 4 is connected to the ground of the top floor 7. An open roof exit 8 is arranged directly above the upper staircase section 3. The roof ground upturned beam 2 surrounds the roof exit 8 on the ground of the roof 6, and the top of the roof ground upturned beam 2 is 30 to 50 cm higher than the ground of the roof 6.

[0028] A sump 9 is provided at the connection between the rest platform 5 and the upper staircase 3. The upper edge of the sump 9 is flush with the ground of the rest platform 5. The sump 9 is covered with a grid-shaped cover plate 10. The bottom of the sump 9 is connected to the municipal rainwater drainage network through a rainwater pipe 11.

[0029] A rooftop staircase platform 12 is provided at the ground connection between the upper stair section 3 and the roof 6. The rooftop staircase platform 12 is flush with the top of the upper rooftop beam 2, and the steps of the upper stair section 3 are connected to the rooftop staircase platform 12; the height of the ground exposed from the roof 6 in the stairwell is only the height of the upper rooftop beam 2, which is still below the height of the roof parapet, and can meet the requirement for the height limit of the roof; since the upper rooftop beam 2 is higher than the ground of the roof 6, rainwater or accumulated water on the roof 6 will not flow back into the upper stair section 3, and at the same time, a sump 9 is set at the rest platform 6 to prevent rainwater from falling from the open-air rooftop outlet 8 into the upper stair section 3 when it rains, causing accumulated water or flowing into the ground of the top floor 7.

[0030] Furthermore, a guardrail 13 is provided on the upper ground beam 2 of the roof, and the guardrail 13 is not higher than the height of the parapet of the roof 6. The guardrail 13 is used to prevent people on the roof 6 from accidentally walking to the open-air roof exit 8 and causing personal injury. At the same time, the guardrail 13 is not higher than the height of the parapet, meeting the height limit requirement.

[0031] Furthermore, safety handrails 14 are provided on both sides of the upper stair section 3 , and the safety handrails 14 are used for pedestrians to hold on to when walking up and down the upper stair section 3 .

[0032] Furthermore, the steps of the upper stair section 3 are all provided with a first slope 15, and the bottom of the first slope 15 is oriented toward the rest platform 5. The first slope 15 prompts rainwater on the upper stair section 3 to quickly flow into the sump 9 to prevent water accumulation on the stairs.

[0033] Furthermore, the rooftop staircase platform 12 is provided with a second slope 16, and the top of the second slope 16 faces the direction of the rest platform 5. The second slope 16 enables the rainwater on the rooftop staircase platform 12 to quickly flow to the ground of the rooftop 6, preventing waterlogging on the rooftop staircase platform 12.

[0034] Furthermore, an external step 17 is provided on the outer side of the connection between the up-turned beam 2 on the rooftop ground and the rooftop staircase platform 12 to connect the up-turned beam 2 on the rooftop ground with the ground of the rooftop 6. The external step 17 and the rooftop staircase platform 12 are respectively located on the inner and outer sides of the same section of the up-turned beam 2 on the rooftop ground, facilitating pedestrian passage. The external step 17 is used to facilitate the up and down movement of pedestrians when the height difference between the up-turned beam 2 on the rooftop ground and the ground of the rooftop 6 is too large.

[0035] Furthermore, the rest platform 5 is provided with an external rooftop door 18 to separate the indoor and outdoor areas. The sump 9 is located outside the external rooftop door 18. The external rooftop door 18 is used for fire prevention and anti-theft, while preventing the cold and hot air outside the rooftop 6 from pouring into the room.

[0036] Furthermore, a threshold 19 is provided at the bottom of the external rooftop door 18. The height of the threshold 19 is 10 - 15 cm. The threshold 19 is precast with reinforced concrete. The threshold 19 separates the indoor and outdoor floors, preventing rainwater from seeping into the top floor 7 room along the cover plate 10 while not causing too much impact on pedestrian passage.

[0037] Furthermore, a waterproof layer 20 is provided at the connection between the periphery of the up-turned beam 2 on the rooftop ground and the ground of the rooftop 6. The waterproof layer 20 is used to prevent the rainwater or waterlogging on the rooftop 6 from seeping in through the joint between the periphery of the up-turned beam 2 on the rooftop ground and the ground of the rooftop 6.

[0038] Furthermore, a thermal insulation layer 21 is sprayed or pasted on the bottom of the open-air part of the staircase. At the same time, the thermal insulation layer 21 extends from the open-air part to the non-open-air part to ensure that the open-air part of the staircase does not have a great impact on the indoor thermal insulation performance.

[0039] Embodiment

[0040] The embodiment is specifically applied to a comprehensive transportation hub project of an international airport in the northwest of China. In this embodiment, a concealed roof-access staircase is adopted. The elevation of all finished surfaces and the beam tops of the staircase are ≤ the elevation of the surrounding parapet wall, meeting the height limit requirements for additional buildings on the roof of the airport and ensuring the overall appearance of the building. At the junction of the roof landing 5 and the upper flight of stairs 3, a sump 9 is provided to collect rainwater in the outdoor area of the staircase, which is collected and discharged into the municipal main rainwater pipe network system through the rainwater pipe 11. A water retaining threshold 19 with a height of 150 mm is provided under the outdoor roof door 18 of the staircase to prevent outdoor rainwater from flowing into the top floor 7 indoors through the landing 5. The finished surface of the outdoor roof staircase platform 12 should be more than 300 mm higher than the finished surface of the top floor 7 to prevent the rainwater on the top floor 7 from flowing into the staircase. A protective railing 13 is added around the upper opening of the outdoor staircase section. The net height from the bottom of the pipe under the sump 9 to the staircase platform is ≥ 2000 mm. The waterproof layer 20 is strictly required in the outdoor staircase section area.

[0041] To prevent outdoor rainwater from drifting into the room, in this embodiment, the roof exit 8 is appropriately cantilevered near the outdoor roof door 18 to form a rain shelter for the outdoor entrance door. At the same time, this embodiment strictly complies with Article 6.8.6 of the Unified Standard for Civil Building Design GB 50352-2019. The net height above and below the staircase platform should not be less than 2.0 m, and the net height of the flight of stairs should not be less than 2.2 m, that is, the net height at the passage above and below the landing 5 is not less than 2.0 m, and the vertical passage net height between the upper flight of stairs 3 and the lower flight of stairs 4 is not less than 2.2 m. Ensure that the cantilevered part of the roof exit 8 also strictly complies with the above standards.

[0042] On the roof, when there are other up-turned beams or steps around the up-turned beam 2 on the roof ground, the height of the up-turned beam 2 on the roof ground must be higher than other up-turned beams or steps, and a water passing hole should be set at the bottom of other up-turned beams or steps for reverse drainage to the up-turned beam 2 on the roof ground to prevent water accumulation between the up-turned beam 2 on the roof ground and other up-turned beams or steps and finally backflow into the room through the roof exit 8.

[0043] The advantages of this embodiment are as follows: It can meet the requirements of not occupying height resources for the staircase to emerge from the roof under the premise of height limit requirements, and at the same time meet the requirements of fire prevention and evacuation. The roof shape design is not affected by the staircase, the parapet wall shape is continuous, the building area is controlled, and the actual usable floor area rate is increased.

[0044] In summary, the present invention provides a concealed roof-access staircase. By removing the staircase on the roof in the prior art and lowering the roof exit emerging from the roof to below the height of the parapet wall by surrounding the open roof exit with an up-turned beam on the roof ground, the height limit requirements for the building roof are met. Therefore, the present invention has a wide range of application prospects.

[0045] It should be emphasized that the above are only the preferred embodiments of the present invention, and there is no limitation in any form to the present invention. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A concealed staircase leading to the rooftop, comprising: Double-run staircase (1), up-turned beam on the roof floor (2). The double-run staircase (1) is divided into an upper flight (3) and a lower flight (4). The upper flight (3) and the lower flight (4) are connected by a landing (5). The upper end of the upper flight (3) is connected to the ground of the roof (6), and the lower end of the lower flight (4) is connected to the ground of the top floor (7). It is characterized in that: there is an open-air roof exit (8) directly above the upper flight (3). The up-turned beam on the roof floor (2) surrounds the roof exit (8) on the ground of the roof (6). The top of the up-turned beam on the roof floor (2) is 30 - 50 cm higher than the ground of the roof (6); A sump (9) is provided at the connection between the landing (5) and the upper flight (3). The upper edge of the sump (9) is flush with the ground of the landing (5). The sump (9) is covered with a grid-shaped cover plate (10). The bottom of the sump (9) is connected to the municipal rainwater drainage network through a rainwater pipe (11); A roof staircase platform (12) is provided at the connection between the upper flight (3) and the ground of the roof (6). The roof staircase platform (12) is flush with the top of the up-turned beam on the roof floor (2). The steps of the upper flight (3) are butted against the roof staircase platform (12); A guardrail (13) is provided on the up-turned beam on the roof floor (2). The guardrail (13) is not higher than the height of the parapet wall of the roof (6); Safety handrails (14) are provided on both sides of the upper flight (3).

2. The concealed staircase leading to the roof as claimed in claim 1, wherein Each step of the upper flight (3) is provided with a first slope (15). The bottom of the first slope (15) faces the direction of the landing (5).

3. A concealed staircase leading to the roof as claimed in claim 1, wherein The roof staircase platform (12) is provided with a second slope (16). The top of the second slope (16) faces the direction of the landing (5).

4. A concealed stairwell leading to the roof, characterized in that, An external step (17) is provided on the outside of the connection between the up-turned beam on the roof floor (2) and the roof staircase platform (12) to connect the up-turned beam on the roof floor (2) and the ground of the roof (6).

5. A concealed staircase leading to the rooftop, as claimed in claim 1, wherein A roof external door (18) is provided on the landing (5) to separate the indoor and outdoor areas. The sump (9) is located outside the roof external door (18).

6. The concealed staircase leading to the roof as claimed in claim 5, characterized in that, A threshold (19) is provided at the bottom of the roof external door (18). The height of the threshold (19) is 10 - 15 cm.

7. A concealed stairwell leading to the rooftop, as claimed in claim 1, wherein A waterproof layer (20) is provided at the connection between the periphery of the up-turned beam on the roof floor (2) and the ground of the roof (6).

8. A concealed staircase leading to the rooftop as claimed in claim 1, characterized in that, The bottom of the open-air part of the staircase is sprayed or pasted with a thermal insulation layer (21).

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