High Quality, High Tunnel Winter Strawberries Jeff Martin, M.S. Candidate Crops Group.
STAIRS 3 rd YEAR TRADE Lesson Two M.S. MARTIN March 2005 Reviewed 2011 M.S. MARTIN March 2005...
-
Upload
sandra-holler -
Category
Documents
-
view
215 -
download
1
Transcript of STAIRS 3 rd YEAR TRADE Lesson Two M.S. MARTIN March 2005 Reviewed 2011 M.S. MARTIN March 2005...
STAIRS3rd YEAR TRADE
Lesson Two
M.S. MARTIN
March 2005
Reviewed 2011
M.S. MARTIN
March 2005
Reviewed 2011
Review Calculations• Determine suitable rise &
going of step to construct a closed riser timber staircase given the following.
• Rise of flight – 2.400m• Going of flight – 3.900m• Assume rise of – 170mm
• No. Risers = 2.400 .170 = 14.117 say 14
• Height of Riser= 2.400 14= 171.428say 171
• No. of Goings = 13 (one less)• Length of going
= 3.900 13= 300
• Check for easy going 2R + G = 550 to 700 (2 x 171) + 300 = 642 OK
Revise Definitions
• Handout
• Complete names on handout & review on completion
Types of Stairs
Ref: Carp 18 Textbook – from P6
Straight Open Riser
Dogleg
Quarter Turn
Geometrical circular
Spiral or Helical
Types continued – from P5 - 9
• Review text for type combination
• Brick• Concrete• Steel or Iron• Other types• Timber
BCA
• Your 2011 workbook on stairs (first section)
• Your text and other printed information, makes frequent reference to BCA requirements, review some of these in the handout
Timber Stairs
Ref: Carp 18 textbook – P25 – 29
Open Riser Stair
• From P27• Also your first
practical exercise• Review these few
pages in your textbook
Closed Riser Staircase
• Your 2011 workbook from P 36
• Review Handout, this will be your second practical project
Rise of step
Margin line
Closed Riser Stair Set - out
Wedge Detail & Size
Nosing line
Tread Detail of Housings
Closed Riser Staircase
Template you made in the workshop
Tenon Details
Copy into your handout
Newel set - out
Newel set – out continued, also P23 carp 18
Stair calculations includinglength of string
Example P31 – carp,18
Stair calculations
• Review example of calculations on P31 of your textbook
Complete exercises
Workbook from P 17
“Extra” Calc’s exercise No. 1
• Copy the following and complete
• Calculate the quantity of timber required for the open riser stair with following spec:– Rise of flight 850mm– Going of flight 1.100m– String material 250mm x 38mm sawn H/W– Treads 40mm thick sawn H/W– Width of stair 1.200m– Assume rise 160mm
Answer – note: this symbol √ below means square root
• No. of Risers= .850
.160= 5.312 say 5 risers
• Height of riser= .850 = 170mm
5• No. of Goings = 4• Width of going
= 1.100 4
= 275mm• 2R + G
= (2 x 170) + 275 + 615 OK
• Length of string√ (rise of flight)² + (going of flight + one going of step)²
√ .850² + (1.100 + .275)²√ .850² + 1.375²√ .723 + 1.891√ 2.614= 1.617
• Order 1.8m lengths• String 250 x 38 H/W 1 @ 3.6• Treads 275 x 40 H/W 1 @ 4.8
• You don’t have to show all the working, but for this example it shows you the full answer
Calc’s Exercise No. 2• Copy the following & complete
• Calculate the timber order for a closed riser flight of stairs to suit the following spec:– Rise of flight 2.450m– Going of flight unrestricted try 280mm– Rise of step approximately 160mm– Riser boards 19mm thick maple, 20mm
nosing– Treads 40mm maple– Stringer 350 x 40mm Maple– Width of stairs 2.600m
Answer No. 2• No. of Risers
= 2.450.160
= 15.310 say 15 risers• Height of riser
= 2.450 = 163mm 15
• No. of Goings = 14• Width of going - unrestricted
= 280
= 280mm• 2R + G
= (2 x 163) + 280 = 606 OK
• Length of string√ (rise of flight)² + (going of flight + one going of step)²
√ 2.450² + (3.920 + .280)²√ 2.450² + 4.200²√ 6.003 + 17.640√ 23.643= 4.862
• Order 5.1m lengths• String 350 x 40 Maple 2 @ 5.1• Treads 300 x 40 Maple 7 @ 5.4