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Unformatted text preview: 2 15 mm from top and 1SO mm belou ground
level (see Fig. 1) to enable 25 mm x 3 mm copper
strip or equivalent bare copper cable to be
taken from the top hole to the bottom through
the central hole. and Curing of Concrete 7.5.1 The concrete shall be used as soon as possible
after being mixed and no material which has developed
an initial set shall be used in the work. After the concrete
has been placed in the moulds and compacted, it shall
not be disturbed during the period of setting. For
depositing concrete in hot weather, IS 786 1 (Part 1)
may be referred. 7.8.2 The purchaser shall specify the type of earthing
to be provided.
7.9 Holes 7.5.2 Compacting During manufacture, sufficient holes shall be provided
in the poles for the attachment of cross arms and other
equipment. A typical arrangement of holes shown in
Fig. 1 permits the use of reinforced concrete poles in
conjunction with wood or steel cross arms. but other
arrangements may be specified by the user. Holes for
kicking block may be provided. if necessary. Concrete shall be compacted by spinning, vibrating,
shocking or other suitable mechanical means. Hand
compaction shall not be permitted.
After placing, the concrete shall be adequately protected,
during setting and in the first stages of hardening,
from shocks, running or surface water and the harmful
effects of sunshine, drying winds and cold. The
concrete shall be cured for at least 28 days unless
special curing methods are adopted, in such cases it
shall be cured till the required strength is achieved.
Steam curing of concrete may be adopted if so desired
by the manufacturer provided the requirements of
pressure or non-pressure steam curing are fulfilled.
7.6 7.10 Eye Hook
To facilitate handling of poles during transport and
erection, an eyehook may be provided suitably in every
pole below ground level on the face of the poles so
as to utilize the maximum flexural strength of the section
8.1 Transverse Finish Strength Test The transverse strength test of reinforced concrete
poles shall be conducted in accordance with IS 2905.
A reinforced concrete pole shall be deemed not
to have passed the test if the observed ultimate
transverse load is less than the design ultimate
transverse load. The concrete when removed from the mould shall be
of good finish and free from honeycombing. All arrises
shall be clean and true and shall present a neat
7.7 Tests on Concrete
During manufacture, test on concrete shall be carried
out as specified in IS 456. The manufacturer shall
supply when required by the purchaser of his
representative, results of compressive test on concrete
cylinders or cubes made from the concrete used for
the poles. If the purchaser so desires, the manufacturer
shall supply cylinders or cubes for test purposes and
such cylinders or cubes shall be tested in accordance
with IS 5 16 . 9 SAMPLING AND INSPECTION
9.1 Scale of Sampling
9.1.1 Lot In a consignment of 500 poles or a part the...
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This document was uploaded on 10/01/2013.
- Fall '13