Method Statement and Risk Assessment for Electrical Cable Trench ExcavationFull description
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RCC Design of CABLE TRENCH for MCC Room
TITLE
CONNECTION WITH MBE'S WORK.REPRODUCTION, USE OR DISCLOSURE OF THE CONTENT OFTHIS DOCUMENT TO THIRD PARTY/IES WITHOUT EXPRESS/WRITTEN PERMISSION OF MBE IS STRICTLY PROHIBITED.
SHEET NO. REVISION
PROJECT
THIS DOCUMENT IS MBE'S PROPERTY AND MUST NOT BE USED EXCEPT IN
W023
JOB NO.
PREPARED APPROVED
DOCUMENT NO.
DATE
0 A.M. R.K.B. 2/11/2014
DESIGN OF R.C.C. CABLE TRENCH: W 1500 x D 1500
2
Surcharge =
1 T/ T /m
Unit wt. of water =
1 T/m
1500 3
150 150
150 1650
1.5 t/m
2
2
0.750
0.50 t/m
2
(earth)
t/m (Surcharge) (water)
1500 2
Grade of concrete
M25
25 N/ N/mm
Grade of steel
Fe500
2
500 N/ N/mm 3
1 t/m
Submerged unit wt. wt. of soil gd Coefficient of Earth Pressure = Depth Effective cover Effective depth Width
0.5 150 40 105 1000
mm mm mm mm
DESIGN OF SIDE WALL: Moment at bottom of wall = 2
Mu/bd = pt = Ast (Required) = PROVIDED
10
Check for shear : Shear ear at the face of support = Nominal shear stress.t v =
1.398 t m/m 1.902 N/mm 0.484 2
5.1 cm DIA. @
150
b = 0.8 f ck / 6.89pt =
0.482 N/mm
2
5.23 cm ( pt = 0.49 0.498 8 ) AT BOTT BOTTOM OM..
2
5.997
Total pt =
0.484
Shear Capacity=
7.24 T
where,
mm C/C
2.438 T 0.35 N/mm
t c = 0.85*(0.8f ck ((1+5b)-1)/6b = where,
2
>
2.44 T OK
O.K.
RCC Design of CABLE TRENCH for MCC Room
TITLE
THIS DOCUMENT IS MBE'S PROPERTY AND MUST NOT BE USED EXCEPT IN
PREPARED
EXPRESS/WRITTEN PERMISSION OF MBE IS STRICTLY PROHIBITED.
APPROVED
DOCUMENT NO.
W023
SHEET NO. REVISION
PROJECT
CONNECTION WITH MBE'S WORK.REPRODUCTION, USE OR DISCLOSURE OF THE CONTENT OFTHIS DOCUMENT TO THIRD PARTY/IES WITHOUT
JOB NO.
DATE
0 A.M. R.K.B. 2/11/2014
DESIGN OF BASE OF TRENCH Self weight of trench = Live load over trench = Total
1.69 t/m 1 t/m 2.69 t/m
Upward pressure =
1.65 t/m
Net pressure = Free B.M at span =
1.04 t/m 0.353 t m/m
2
Mu/bd = pt = Ast (Required) = PROVIDED
8
2 2
0.480 N/mm 0.120 1.3 cm DIA. @
2
2
250
mm C/C
2
2.01 cm ( pt = 0.191 ) AT BOTTOM.
O.K.
Distribution Steel: Distribution reinforcement= 0.060 % of gross cross sectional area on each face Ast required = 0.06*150*1000/100 90.00 mm2 Spacing required = 558 mm Provide
