2.Cement Concrete Consideration
Typical poles have a setting depth
based on a definite empirical formula
which comes out to be approx.
21% of pole buried and rest aerial.
Assuming Wind load that pole may
be accustomed to additional support
for grouting pole base by anchor
fastener or HILTI may be provided
for additional strengthening purpose
based on actual site condition
Concrete Grade & Mix:
As per IS 456:2000, the code of
practice for normal and reinforced
concrete, Letter M represents mix
(Concrete Mix) and number followed
after M represents the compressive strength to be attained in N/sq.mm
at 28 days age when a standard
cube of 150X 150 X 150 mm is
subjected to standard compressive
strength. Thus a concrete of M20
grade should attain a compressive
strength of 20N/sq.mm at 28 days of
age. Generally grades of concrete
lower than M20 are not to be used
for RCC work. Here N = Newton, mm
= millimeter.
Concrete Grade:
General expression for the
proportions of cement, sand and
coarse aggregate is 1: n : 2n by
volume.
M5 = 1:4:8 (1 portion of cement,
4 portion of sand and 8 portion of
coarse aggregate)
M10 = 1:3:6 ;M15 = 1:2:4; M20 =
1:1.5:3; M25 = 1:1:2
3. Foundation designs and installation method
Cast in Situ foundation: Basis the
selection of the concrete mix, pole
foundation is cast with anchor bolts to hold the base plate. Pole is later
fastened to the base plate on the
anchor bolts.
Precast Muff Design
Pre cast RCC Muff is fixed in the
ground and the pole is mounted
inside the Muff with PCC all around
the pole inside the muff. This gives a
faster and economical way to install
the average sized poles upto a
length of 6-12 m poles.
4. Comparison between the above designs
1. Ease of installation- As compared to the Cast in situ option, muff design
is better as it involves lesser labor
and time for installation. RCC takes
a curing time 5-6 days before the
pole can be installed whereas the
muff design takes 2-3 days
2. Cost of Installation – Comparison
is given below.
5. Recommended Pole Foundation:
Basis the above analysis and
business requirements, we
recommend to use the Muff design
of pole foundation for all smart city
applications in Smart lighting, CCTV
Camera Installation, WiFi Hotspot
and Access point Installation.
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