AREA TOOL For area calculations for GBP submissions, it is now advisable to use the BD website. (2023 version)
https://www.bd.gov.hk/en/resources/codes-and-references/building-information-modelling/index.html
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CODE OF PRACTICE FOR MINIMUM FIRE SERVICE INSTALLATIONS AND EQUIPMENT
“Natural Venting of Staircases” means As an alternative to pressurisation of staircase by provision of venting of smoke from staircase in accordance with Section 2 of BS 5588: Part 5: 1991 in particular paras. 8.4(a), (b) and (h) and the latest version of the Standard. BS 5588 : Part. 5 : 1991 Section 2 8.4 Recommendations for the venting of firefighting shafts by natural means NOTE 1. Firefighting shafts serving basements with floor levels more than 9m below ground level should be pressurized. (see 8.2 (a)). The following recommendations are applicable. (a) An openable vent with an area of not less than 5 % of the horizontal cross-sectional area of the firefighting stair enclosure should be provided at the top of the stair enclosure, sited where it will not be unduly affected by wind pressures1). The vent should be provided with a remote control mechanism located adjacent to the fire service access doorway and clearly marked as to its function and means of operation. All connections between the remote control and the opening mechanism should be within the firefighting shaft. Where any part of the remote-control mechanism is powered by electricity, a secondary supply should be provided (see also clause 16). (b) For firefighting stairs adjacent to external walls, openable vents with an area of not less than 15 % of the horizontal cross-sectional area of the stair enclosure should be provided at each storey level above ground level. Any door opening directly to open air should be considered to contribute to the requirements for venting and where possible such doors should not be kept locked. (c) Firefighting stairs that: (1) serve only basement levels less than 9 m below ground level; and (2) lead directly to a final exit ; need not be provided with openable vents at any level. NOTE 2. The door to the final exit serves as a vent. (d) Lobbies above ground level should be provided with openable vents with a free area of not less than 25 % of the horizontal cross sectional area of the firefighting lobby with the vent(s) sited as near to the ceiling as is practicable. (e) Firefighting lobbies at each basement level in a particular firefighting shaft should each be provided with a vent at high level having a minimum cross-sectional free area of 1 m2. The vent should discharge direct to open air or into a smoke shaft, serving only that storey, with a cross-sectional area not less than that of the vent. Smoke shafts serving basements should discharge direct to open air at ground level where the exits from the building and fire brigade access would not be affected by the smoke discharge. Any cover to a smoke shaft serving a basement should be a metal grille designed to prevent blockage of the shaft by rubbish, or both breakable and easily. accessible from the appropriate fire service access level. (f) Unless vented direct to open air, the firefighting stair should be vented into a separate smoke shaft, and not into the smoke shaft serving the firefighting lobbies. Any smoke shaft serving a firefighting stair or lobbies should be fully open to the external air at top and bottom and the outlets should be sited where they will not be adversely affected by wind pressures). N0TE 3. The shaft serving the stair and the shaft serving the lobbies may be interconnected at the lowest level, i.e. forming a u-shaped shaft, without being open to external air at that level, if the smoke control performance of the shaft Is equivalent to that of two separate shafts each open at top and bottom. Openings into the smoke shaft should be guarded to a height of not less than 1.1 m. (g) Smoke shafts serving storeys above ground level should have: (1) a minimum internal area of 25 % of the lobby floor area, or. 3 m2, whichever is the greater, with a minimum internal dimension of 1 m, where serving lobbies ; (2) a minimum internal area of 15 % of the horizontal cross-sectional area of the stair with a minimum internal dimension of o.75 m, enclosure or 1.5 m2, whichever is the greater. where serving a stair. (h) All openable vents provided for smoke control (with the exception of vents sited above a stair see item (a)) should be outward opening, should not be top hung, should open a minimum of 30。, should be clearly identifiable and accessible and should be fitted with: (1) simple lever handles; or (2) rotary drives to simple rack or gear operated devices; or (3) locks which can be operated with a square ended key 8 mm x 8 mm in cross section and 25 mm deep. (i) Permanent vents should not be provided. According to above regulations: If you want to use natural vent staircase to omit pressurisation staircase. There are four main points for openable windows of natural vent staircase requirements you must be pay attention !
If you cannot fulfil above this ! You must get trouble! 1. NOTIONAL KITCHEN AREA WIDTH AND DEPTH ADDED !
2. MIN. WITH OF EXIT ROUTE INSIDE FLAT UNIT ALSO REQUIRED ! 3. HOUSEHOLD STOVE FIRE SHOULD BE SHIELDING BY WALLS FROM THE NEAREST CORNER OF THE STOVE TO THE DOOR KNOB WHEN THE EXIT DOOR WAS IN CLOSED POSITION. ode of Practice for Fire Safety in Buildings 2011
(June 2023 Edition) Subsection B8 – Exits from Storeys Clause B8.2 Where two or more required staircases are needed, people using one required staircase should be able to gain access to at least one other required staircase at any time, without having to pass through other person’s private premises. Such access should be provided in the following manners: (a) at least every 5 storeys, and on the roof or the topmost floor accessible to the required staircases; or (b) in case of refuge floor(s) are provided evenly between floors of the building, at the refuge floor(s) and the roof. Security measures that prevent access to a required staircase must be automatically deactivated upon actuation of a fire alarm signal or in power failure situation. No need at each floor from required staircase give an access to another staircase ! Previous Version oF Code of Practice for Fire Safety in Buildings 2011 Subsection B8 – Exits from Storeys Clause B8.2 Where two or more required staircases are needed, people using one required staircase should be able to gain access to at least one other required staircase at any time, without having to pass through other person’s private premises. Such access should be provided in the following manners: (a )at each floor; (b) in case of domestic building or composite building not exceeding 15 storeys in height above the lowest ground storey, at least every 5 storeys; or (c) in case of refuge floor(s) are provided evenly between floors of the building, at the refuge floor(s) and the roof. Flat roof need to count number of person were occupied and need to demonstrate travel distance , fireman’s lift serving distance and temporary refuse space serving distance in GBP submission ?
Why some BS request to demonstrate all above this in GBP submission? 1. Code of Practice for Fire Safety in Buildings 2011 (June 2023 Edition) no mention about MOE of flat roof ! 2)Only Summary of Items Discussed in 4/2014 APSEC Discussion Forum on 8 August 2014 have mention this ! The BD considered that whether only ONE escape staircase was sufficient for flat roofs on podium which was not used as licensed premises, depended on the layout of the building. Hence its acceptance had to be considered on a case-by-case basis while the requirement on travel distance might be relaxed. In the case of flat roof attached to a residential unit, it was accepted that exit staircase might not be required as it should be accessible from the residential unit. This is the answer ! However BS still disregard this ASPEC !
CAP_123F_Building (Planning) Regulations
25.Space about domestic buildings Every domestic building on a class A or B site or on a class C site shall have within the site an open space at the rear, or partly at the rear and partly at the side, at a level of not less than 150 mm below the floor of the lowermost storey in accordance with the Second Schedule: Provided that where the Building Authority considers it necessary for proper and equitable development or redevelopment of an adjacent site, he may require the provision of more open space than that specified in the Second Schedule. If domestic towers is located above podium roof and caretaker’s quarter is located at below podium roof ? Caretaker’ quarter is domestic use ! where open space must be placed ? BS said that : Open space must place at a level of not less than 150mm the floor of lowermost domestic storey ! Crazy! BD advised that plant rooms, other than those described under paragraph |
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