Specifications

NAIROBI OPERATIONAL HUB
UNOPS Building, UN Lane, Off UN Avenue Tel: [phone]
P.O Box 783,Village Market, 00621 E-mail: [e-mail]
Nairobi, Kenya Website: www.unops.org
UNOPS is ISO 9001 certified
D. The duct bank manhole/interface shall include an expansion joint to take up
longitudinal movement due to expansion and construction of the duct bank. This
joint shall also act as water stop to prevent water from seeping inside the manhole.
E. The exterior of the manhole shall be waterproofed, with a bituminous coating in
accordance with Section 03300.
F. Each manhole shall have two cable pulling irons opposite each duct bank entrance.
G. Access to deep manholes shall be through a chimney. Permanent ladders or rungs
shall be installed, if required by the Engineer on site or shown on the Drawings.
H. Manholes shall be provided with earth-rods and cable supports as per the
requirements of Local Standards Organization, BS or Electricity supply Authority.
I. The frames and covers of all manholes shall be heavy duty, cast iron, round with
solid type gasket lids, and countersunk locking devices. Covers shall seal tightly
and not rock, when installed.
2.05 HANDHOLES
A. Handholes may be formed either monolithically or built up to designed sizes by
combining several concrete sections cast in various shapes and sizes.
B. Handholes shall be provided with cast iron covers, sumps, ground-rods, etc. as
shown on drawings or required as per the requirements of Local Standards
Organization, BS or other applicable standards. Section joints shall be grouted.
C. The frames and covers of all hand holes shall be heavy duty, cast iron, round with
solid type gasket lids, and countersunk locking devices. Covers shall seal tightly and
not rock, when installed.
2.06 EARTH ROD PITS
A. Earth rods pits shall be provided for all earth rods in accordance with the
requirements of Section 16640.
B. Earth rod pits shall be precast of either square or round section with cover.