working drawing lectures 6

7/28/2019 Working Drawing Lectures 6

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Stair6. VerticalCirculation


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Cut String

Full String


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Newel (post)- 16-


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- 17-

Handrail


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- 18-


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Riser- 19-

Riser:The vertical face of the step of a stair


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- 20-

Nosing

Step: The combination of one riser and one tread

Nosing: The round projected part of a tread to protect

the riser from kick

Step


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- 21-

Rise: The total floor finish to floor finish V. height of stair

Going: The total horizontal length of a stair including

platform


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- 22-

Flight: a part of stair from floor (landing) to floor(landing) that you move without interruption

Landing: the floor area a the beginning, end or

intermediate point of a stair

Platform: intermediate landing

Platform

Landing

Flight

Flight

Flight


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- 23-

Head Room: The shortest clear vertical distance b/n the nosingof a tread and the ceiling

Stair Case (well): The enclosed chamber into which the stairsare built

Stair Case (Well)


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- 24-

Residential Stairs Requirements

Min Width of flight is 90cm.

Width of flight = 60 cm x no. of people that pass at a time Width of landing = Width of flight

The slope of stair should be 30 and 35 degrees.

Min head room = 180cm

Comfortable head room = 210cm

Min Tread Length = 25cm, Max Tread Length = 33cm

Min Riser Height = 15cm, Max Riser Height = 19cm

The max gap b/n balusters = 12.5cm

Height of handrail = 90cm Tread should be made of non slippery material

Handrails should be made of non temperature dependent

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- 25-

Stair Calculation

2 ( Riser) + Tread = 55 to 70cm

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= Determine floor finish to floor finish height = Rise 2nd = Divide Rise by your choice of Riser

3rd = Round the calculated Riser to the nearest whole no.

4th = No. of Tread = No. Risers1

5th = Divide stair length by Tread to find no. of treads

Eg. Height of room is 300cm

Choose Riser height = 15cm

No. of Riser = 300cm/ 15cm= 20

If the stair is U Stair = 20/2= 10 risers per flight No. of Tread per flight = 10-1 = 9

If Tread & width is 25 cm, then stair length

9 x 25cm tread + 2 X 90cm landing = 405


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- 28-

Escalator

moving stair that connects two or more floors

it needs electrical power used in public buildings like airport, mall etc

it helps to control the speed of people movement

too expensive and takes much space


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Elevators

rectangular boxes that moves people from one floor to

another it needs electrical power

used in buildings with height of greater than G+4


expensive and takes small to large space based on the type

of stair


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Ramp

sloping floors to move people from one floor to another

it needs no electrical power used in public buildings to make them accessible by

disable people like hospital


not expensive and takes large space

working drawing lectures 6

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