CALCULATION SHEET Formula Scaffolding Ltd JOB TITLE: Nyria Way 70 High Street West End SUBJECT: Design check Southampton Hants CUSTOMER: Kier Services PDF

Preview

Summary

CALCULATION SHEET Job No. 147 Sheet 1 of 3 Rev: Formula Scaffolding Ltd JOB TITLE: Nyria Way 70 High Street West End SUBJECT: Design check Southampton Hants CUSTOMER: Kier Services SO30 3DU Tel: 02380 466900 MADE BY: Wayne Lovelock Date:28/09/12 ------------------------------------------------------...

Description

CALCULATION SHEET Job No. 147 Formula Scaffolding Ltd

Sheet 1 of 3

Rev:

JOB TITLE: Nyria Way

70 High Street West End Southampton Hants

SUBJECT: Design check

CUSTOMER: Kier Services

SO30 3DU Tel: 02380 466900

MADE BY: Wayne Lovelock

Date:28/09/12

-------------------------------------------------------------------------------------------------------Codes used in this design TG20:08 volumes 1 and 2 Technical guidance on the use of BSEN12811-1. BSEN12811-1 BS5975:2008 Code of practice for temporary works procedures BS6399-2: 1997 loadings for buildings-code of practice for wind loadings NASC guidance notes. BSEN 1991-1-3 and 4 snow and wind loadings. Materials used Scaffold tube Type 4 BSEN 39. Diameter 48.3mm Wall thickness 4.0mm Weight 4.37kg/m Cross section area 5.57cm² Second moment of area I= 13.8cm4 Radius of gyration r= 1.57cm Yield stress fy= 235N/mm² Plastic modulus Sp= 7.87cm³ Safe working Moment Mc= 1.12kn.m Safe working shear force = 29.2kn. Safe axial load as TG20:08 table 20 and 40.

BS1139:1992 48.3mm 4.0mm 4.37kg/m 5.57cm² 13.8cm4 1.57cm 210N/mm² 7.87cm³ 1.00kn.m 26.1kn

Scaffold Boards BS 2482. Specification Scaffold Fittings see TG20:08 table 24 Ladder beams steel, permissible bending 13.5kn.m, permissible shear 18.0kn. 450mm aluminum beams (Generation) permissible bending 13.9kn.m, permissible shear 12.3kn. Diamond aluminum beams (Generation) permissible bending 39.5kn.m, permissible shear 33.5kn

CALCULATION SHEET Job No.147 Formula Scaffolding Ltd 70 High Street West End Southampton Hants SO30 3DU Tel: 02380 466900

Sheet 2 of 3

Rev:

JOB TITLE: Nyria Way SUBJECT: Double width independent.

CUSTOMER: Kier Services MADE BY: Wayne Lovelock

Date: 28/09/12

CHECKED BY:

Date:

-------------------------------------------------------------------------------------------------------------------

The independent scaffold erected to the girth of the block is a basic scaffold as defined by Tg20:08 4.4.2. It has a load class 3 with each lift boarded ( 2.0kn/m2 on one lift and 1 .00kn/m2 on a second lift). Wind load S factor = 22 x 1.00 x (1+10/1000)=22.22 < 40 ( 4.4.2-7). One element of the scaffold to rear adjacent the balconies is a double width independent at the base lift which needs a further design check, and a loading bay adjacent the scaffold with a 10kn/m2 loading needs a design check. Double width to the rear. Load = 2.00kn/m2. Inner bay at 4bds wide and outer bay up to 7 bds wide. Load to transoms from inner bay, 2.00kn+0.25kn x 1.2= 2.7kn/m. 2.7kn x0.9= 2.43kn. Bm= 2.43 x0.9/8=0.27kn.m < 1.12kn.m therefore acceptable. End reaction 2.43/2=1.22 to the centre ledger. Load to transoms from outer bay, 2.00kn+0.25kn x 1.2=2.7kn/m 2.7kn x 1.58=4.3kn. Bm 4.3 x1.58/8=0.85kn.m therefore acceptable. End reaction to centre ledger= 4.3kn/2=2.15kn. Max load to centre ledger from CPL of each transom = 1.22+2.15=3.37kn. Bm to ledger 3.37x2/4=1.68kn.m > 1.12kn, therefore use a twin ledger as the centre ledger on the base lift. 1.68kn.m < 2 x 1.12kn.m, therefore acceptable.

CALCULATION SHEET Job No. 147 Formula Scaffolding Ltd 70 High Street West End Southampton Hants SO30 3DU Tel: 02380 466900

Sheet 3 of 3

Rev:

JOB TITLE: Nyria Way SUBJECT: Loading bay

CUSTOMER:

Kier Services.

MADE BY: Wayne Lovelock

Date: 27/09/12.

CHECKED BY:

Date:

-------------------------------------------------------------------------------------------------------------------

The loading bay is to be 2 (5 board) bays wide complete with each lift boarded and up to 6m long. Loading to be one lift at any time at 10kn/m2. Load to boards with transoms at 600mm.. 10+0.25kn x 0.6=6.15kn/m. Bm 6.15 x 0.6 x0.6/8=0.28kn.m 7.56kn) Pc at 2.0m = 28.2>7.56 therefore acceptable. Summary. Outside bay size 1.2m, inner standards at 0.6m Lift heights 2m to match independent scaffold. Transoms at 600mm centres. Only 1 lift to be fully load at a time. Brace externally over 3 sides (allowing for chute and hoist.), wing brace 2nd and 4th lift to the independent, internally ledger brace every other standard to on bay only....