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Staircases BCGCA3016B. Types of Stairs Straight Open Riser Dogleg Closed Riser Definition – Flights Between Landings 1 Flight 2 Flights.

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Presentation on theme: "Staircases BCGCA3016B. Types of Stairs Straight Open Riser Dogleg Closed Riser Definition – Flights Between Landings 1 Flight 2 Flights."— Presentation transcript:

1 Staircases BCGCA3016B

2 Types of Stairs Straight Open Riser Dogleg Closed Riser Definition – Flights Between Landings 1 Flight 2 Flights

3 Straight Open Riser

4 Stair Types

5 Double Closed Stair Stair Types

6

7

8

9 Double Open Sided Stairs

10 In this case one side is closed while the other is open

11 Note The Bracketed Stairs refers to decoration & Cut String Also Known as Cut String

12 Quarter Turn Stair Open Newel Stair

13 Spine String Stair

14 Types of Stairs Geometric Spiral

15 Types of Stairs Quarter Turn

16 Parts of Stairs

17

18

19

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21

22

23

24

25

26

27 Half Space Landing Change stair direction 180⁰ Landing width = width of stair (min 750mm) Used in Dogleg Stairs

28 Quarter Space Landing Change Stair Direction 90 ⁰ Landing Width & Length = Stair Width Forms Quarter Turn Stair (min 750mm)

29 Intermediate Landing Allows the Stair to continue in same direction Required where more than 18 Risers May be used to give a rest Width = Stair Width Length = Stair Width or greater

30

31 Quarter Space Landing

32 Quarter Turn Stair

33 Winders

34 Materials Used in Stair Construction Timber Metal Stone Glass

35 Timber Stairs

36 Metal Stairs

37 Concrete Stairs

38 Stone Stairs

39 Glass Stair

40 Combination of Materials

41

42 Definitions

43 Rise & Going must stay the same within flight

44 BCA Requirements

45

46 Stair Requirements

47 Winders Treads that are tapered Must have same rise as the flights Maximum of 3 treads per quarter turn Must be same width at centre on widths < 1m If stair > 1m same width 400mm from inside handrail

48 Winders

49 Calculate Stair No Restriction on Going Determine Total Rise= 2700 Select suitable Rise Say 175mm Divide Total Rise by Rise = 2700/175 = Either 15 or 16 Risers = 2700/15 = 180mm 2700/16 = mm Use 180mm is closer to 175mm Best Going 2R + G Between 550 to 700 Midpoint = 625

50 Determine Best Going BCA states that going must be within the range 2 x Rise (R) + Going(G) = 550 to 700 We can assume that the best answer is the Midpoint ( )/2 = 625 Best Going2R + G = 625 Best GoingG = 625 – 2R

51 Calculate Stair No Restriction on Going Determine Total Rise= 2700 Select suitable Rise Say 175mm Divide Total Rise by Rise = 2700/175 = Either 15 or 16 Risers = 2700/15 = 180mm (Use) 2700/16 = mm Best Going 2R + G Between 550 to 700 Midpoint = 625 Either Rise 180 Going 265 Determine Best Going 2R + G = 625 G = 625 – 2R Best Going for180 Riser265 = 625 – 2 x 180

52 Calculate Stair No Restriction on Going Use Rise 180 Going Risers 14 Goings

53 Calculate Stair Restriction on Going Preferred Rise 175mm Divide Total Rise by Rise = 2700/175 = Either 15 or 16 Risers = 2700/15 = 180mm 2700/16 = Use 180mm Determine Best Going 3800/14 = x 180 = (Closest) 3800/15 = x = 591 Best Going 2R + G Between 550 to 700 Midpoint = 625 Use Rise 180 Going Risers 14 Goings

54 Calculate Stair Flight with Quarter Turn Stair width 900mm Once an Intermediate Landing is introduced the top flight becomes constrained

55 Calculate Stair Flight with Quarter Turn Stair width 900mmPreferred Rise = 165mm 2700/165 = /16= (3.75 Diff) /17= (6.176 Diff) Use Rise = Best Going = 625 – 2R = 625 – 2 x = /287.5 = /6 = 300 (12.5 Diff) 71800/7 = ( Diff) Rise = Going = 300 Best Going 2R + G Between 550 to 700 Midpoint = 625 G = 625 – 2R

56 Calculate Stair Flight with Quarter Turn Stair width 900mmPreferred Rise = 165mm 2700/165 = /16= (3.75 Diff) /17= (6.176 Diff) Use Rise = Best Going = 625 – 2R = 625 – 2 x = /287.5 = /6 = 300 (12.5 Diff) 71800/7 = ( Diff) Rise = Going = 300 Best Going 2R + G Between 550 to 700 Midpoint = 625 G = 625 – 2R

57 Calculate Stair Constrained Flight with Quarter Turn Stair width 900mm From Previous we know 15 Risers at 180 Length of 1 st Flight = Divide by Best Going = 1800/265 = 6.79 Going Either 1800 /6 = 300mm 1800/7 = 257mm is Closest to 265 Best Going 2R + G Between 550 to 700 Midpoint = x 180 = 265

58 Calculate Stair Constrained Flight with Half Space Landing Stair width 900mm Preferred Riser 170mm 3600/170 = /21 = /22 = Use mm Best Going = 625 – 2R = 625 – 2 x = Length of 1 st Flight = 4050 – 900 = 3150 Divide by Best Going = 3150/ = /11 = /12 = Use

59 Calculate Stair Constrained Flight with Half Space Landing Stair width 900mm Preferred Riser 170mm Rise mm Going

60 Calculate Stair Constrained Flight with Quarter Turn Winders Stair width 900mm Preferred Riser 170mm 4100/170 = /24 = /24 = 164 Use Rise Best Going 625 – 2R = BG 625 – 2 x = / = /9 = (USE) /10 = 265 Rise Going

61 Calculate Stair Constrained Flight with Quarter Turn Winders Stair width 900mm Preferred Riser 170mm 4100/170 = /24 = /24 = 164 Use Rise Best Going 625 – 2R = BG 625 – 2 x = / = /9 = (USE) /10 = 265 Rise Going

62 Calculate Stair Constrained Flight with Half Space Landing Stair width 950mmPreferred Riser 170mm 3400/170 = /20 = 170 Rise Best Going = 625 – 2R = 625 – 2 x 170 = /285 = /8 = 300 (15 Diff) 92400/9 = (18.3 Diff) Rise 170 Going 300

63 Calculate Stair Constrained Flight with Half Space Landing Stair width 950mmPreferred Riser 170mm 3400/170 = /20 = 170 Rise Best Going = 625 – 2R = 625 – 2 x 170 = /285 = /8 = 300 (15 Diff) 92400/9 = (18.3 Diff) Rise 170 Going 300 With all examples either answer will comply and you should consult with your client and/or Architect

64 Determine Steel Square Mathematically 40mm Margin

65 Determine Steel Square Mathematically

66 Zoom In Stair Pitch = ⁰

67 Determine Steel Square Mathematically Margin Line Stair Pitch = ⁰

68 Determine Steel Square Mathematically This angle must be the same Stair Pitch = ⁰

69 Determine Steel Square Mathematically This angle must be the same Stair Pitch = ⁰ Sin Ѳ = Adjacent / Hypotenuse = 40 ÷ X X = 40 ÷ Sin X =

70 Determine Steel Square Mathematically This angle must be the same Stair Pitch = ⁰ Sin Ѳ = Adjacent / Hypotenuse = 40 ÷ X X = 40 ÷ Sin X = 81.13

71 Determine Steel Square Mathematically Set Out For Steel Square Going Going + Margin ÷ Sin Ѳ = ÷ Sin 29.54⁰ = mm Ѳ

72 Determine Steel Square Mathematically Set Out For Steel Square Rise Ѳ

73 Determine Steel Square Mathematically Set Out For Steel Square Rise Ѳ This Angle must =

74 Determine Steel Square Mathematically Set Out For Steel Square Rise Ѳ This Angle must = This Angle must = 29.54⁰ Y = 40 ÷ Cos 29.54⁰ Y =

75 Determine Steel Square Mathematically Set Out For Steel Square Rise Ѳ This Angle must = This Angle must = 29.54⁰ Y = 40 ÷ Cos 29.54⁰ Y =

76 Determine Steel Square Mathematically Set Out For Steel Square Rise Ѳ Rise + Margin ÷ Sin Ѳ = ÷ Sin 29.54⁰ = =


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