The practice of bay windows under the requirements of the code
Do it according to the "Code for Fire Protection Design of Buildings".
Code for Fire Protection in Building Design
6.2.5. Except as otherwise provided in this code, the height of the building on the outer wall and between the openings on the lower floor shall not be less than 12m solid wall or pick-out width not less than 10m, the length is not less than the width of the opening of the fireproof eaves; ......Explanation of Provisions: 62.5 This article is mandatory. If the necessary fire separation measures are not taken between the openings of the façade of the building, it is easy to cause the fire to spread to each other through the openings, so this article stipulates the fire prevention measures between the openings of the façade. ......
Schematic view of the bay window.
Real view of the bay window. Interpretation of Tutu Specification:
Problematic: The window sill is too high and inconvenient to use.
Generally, the height of the chair is about 43cm, and it will be safer and more comfortable to sit on the chair, and when it is higher than 43cm, the comfort will decrease, and the safety factor will also be reduced, such as the height of the bar below.
Seat height Example
In terms of safety, protective measures such as window guards and railings were not considered.
There are many problems with bay windows according to the most basic code requirementsImprovements are urgently needed.
Two improvements: reduce the height of the window sill, add protective railings and other protective measures. According to the "Unified Standard for Civil Building Design" improvement
Unified Standards for the Design of Civil Buildings
6.11.7 When the bay window sill height is less than or equal to 0When 45m, its protection height should not be less than 0 from the window sill surface9m；When the bay window sill height is higher than 0When 45m, its protection height should not be less than 0 from the window sill surface6m。Explanation of Provisions: 611.7. The protective measures of the bay window are to prevent people from falling from high altitude after the glass is impacted, and the protective measures can adopt the practice of setting up protective railings or adopting laminated glass with horizontal window frames. The selection of laminated glass should comply with the provisions of the current industry standard "Technical Regulations for the Application of Architectural Glass" JGJ 113.
According to the practice of the "Unified Standard for Civil Building Design":
Laminated glass
Schematic diagram of the bay window elevation.
Interpretation of Tutu Specification:
Laminated glass is used for protection in fixed windows, but there is a problem: laminated glass is hard to find.
500mm highWindow sill,100mm high exterior wall flip edge, plus 600mm high railing.
Schematic view of the bay window.
Schematic diagram of the bay window elevation.
Interpretation of Tutu Specification:
The bay window sill is 500mm high, and the 100mm high exterior wall is flapped, and a 600mm high railing is added.
The design of this practice is relatively comfortable and perfect, but according to the provisions of the "Residential Design Code".This cannot be achieved
According to the "Residential Design Code" and then improved
Residential Design Code
5.8.2. When setting up bay windows, the following provisions shall be complied with:
2. The clear height of the bottom of the sash window opening from the window sill surface is less than 0At 90m, there should be protective measures at the window opening. Its protection height should not be less than 0 from the window sill surface90m；Explanation of Provisions: ......The clear height of the bottom of the opening window opening from the bay window surface is less than 090m, prone to falling accidents. Therefore, this article stipulates that the net height of the bottom of the sash window opening from the window sill surface is less than 0When 90m, there should be protective measures at the window opening, and the protective height should not be less than 0 from the window sill surface90m；
Schematic diagram of the bay window elevation (window cannot be opened).
Interpretation of Tutu Specification:
There was a problem: the windows of high-rise residential buildings were forbidden to be opened outward, so the railings were too high, resulting in the windows not being able to open and the acceptance could not be passed.
Improving practices: Under the 900mm high railing, the opening fan will be raised
Schematic diagram of the bay window elevation.
Schematic view of the bay window.
Interpretation of Tutu Specification:
There was a problem with the improved approach: the railing was relatively too high, which was aesthetically pleasing, and the view was obstructed.
How to resolveThe best solution: 400mm high window sill, 200mm high exterior wall flip edge, plus 900mm high railing
Unified Standards for the Design of Civil Buildings
6.11.7 Explanation of the article: The protective measures of the bay window are to prevent people from falling from a high altitude after the glass is impacted, and the protective measures can be set up with protective railings or the practice of adding laminated glass with horizontal window frames.
Schematic view of the bay window.
Schematic diagram of the façade of the bay window.
Schematic diagram of the façade of the bay window.
Interpretation of Tutu Specification:
This is the optimal solution: the bay window sills continue to be lowered, 400mm high bay window sills, 200mm high exterior wall flip edges, 700mm high fixed windows, and 900mm high railings.
In this practice, the ratio of the opening sash to the fixed sash is relatively comfortable, and the window opening is not affected.
But the disadvantage is that the construction is more difficult.
Real view of the bay window. Add 600mm high railings indoors and 300mm high railings outdoors
Residential Design Code
5.8.2. When setting up bay windows, the following provisions shall be complied with:
2. The clear height of the bottom of the sash window opening from the window sill surface is less than 0At 90m, there should be protective measures at the window opening. Its protection height should not be less than 0 from the window sill surface90m；
Unified Standards for the Design of Civil Buildings
6.11.7 When the bay window sill height is less than or equal to 0When 45m, its protection height should not be less than 0 from the window sill surface9m；When the bay window sill height is higher than 0When 45m, its protection height should not be less than 0 from the window sill surface6m。
Schematic view of the bay window.
Schematic diagram of the bay window elevation.
Real view of the bay window. Interpretation of Tutu Specification:
From the current point of view, the local drawing review agencies recognize this practice.
External railings or railings outside the window
Unified Standards for the Design of Civil Buildings
6.11.7 Explanation of the article: The protective measures of the bay window are to prevent people from falling from a high altitude after the glass is impacted, and the protective measures can be set up with protective railings or the practice of adding laminated glass with horizontal window frames.
Schematic diagram of external protective railings and steeplechaising.
Interpretation of Tutu Specification:
It is not common to add protective glass railings to the windows to achieve protection.
Does a bay window count as an area?Regarding bay windows, there is another one that is particularly easy to overlook"Big pit"., is the bay window counted as an area?
Code for Calculation of Construction Area of Construction Projects
3.0.13. The height difference between the window sill and the indoor floor floor is 0Below 45m and the structure clear height is 2Convex (bay) windows of 10m and above should be calculated according to the horizontal area of the periphery of their envelope structure1 2 area.
General Code for Civil Buildings
3.1.6 The following spaces and parts should not be calculated as construction area: -1 The height of the structure or the height of the top of the slab of the inclined structure is less than 220m of building space;
Interpretation of Tutu Specification:
From the above provisions, it can be summarized as follows:
When the net height of the structure is 2100mm, it is not included in the area;
When the height of the window sill is 450mm, it is not included in the area.
Let's take a look at the bay windows at different floor heights
3000mm layer height, the window sill height is 400mm, the clear height of the bay window structure is 2000mm, and the bay windowRegardless of area
3000mm floor height, bay window section schematic diagram.
3150mm layer height, the window sill height is 400mm, the net height of the bay window structure is 2150mm, and the bay windowCount the area
3150mm floor height, bay window section schematic diagram.
Under different floor heights, bay windows do not count the area
Code for Calculation of Construction Area of Construction Projects
3.0.13. The height difference between the window sill and the indoor floor floor is 0Below 45m and the structure clear height is 2Convex (bay) windows of 10m and above should be calculated according to the horizontal area of the periphery of their envelope structure1 2 area.
2900 3000mm floor height, window sill surface height400mm，Exterior wall flip edge200mm。▼▼
2900 3000mm floor height, bay window section schematic diagram.
3150 3300mm floor height, window sill surface height450mm, 150mm on the outer wall. ▼▼
3150 3300 storeys high, bay window section schematic diagram.