Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

3. Section-1600
C. Do’s and Don’ts
Do’s Don’ts
1. Take precautions for safe guarding the environment
(Clause 110 of MoRD Specifications)
2. Take appropriate measures to ensure stability of
slopes during construction. Provide the necessary
protective measure for safety against erosion,
subsidence and recurrent slips and slides. Provide
apron below the outlet point of culvert where height
of waterfall is liable to cause erosion.
3. Ensure that safety measures including traffic signs,
guideposts, railings, parapets are provided at
appropriate places.
4. Safeguard the Reference Pillars till the completion
of work
5 Identify areas for proper disposal of debris and waste
materials before commencement of the work
6. At hairpin bends, pave the entire roadway width to
avoid erosion.
7. Provide one cross drain on upper arm of hair pin
bend just before the bend to minimize flow of water
along the surface of the road.
8. If hill cutting is done by manual labour, then start
from back cutting line proceeding outwards to valley
face otherwise it will be difficult to rectify the defects
left in back-cutting.
9. Always prepare completion plans of completed
lengths and compare it with original drawings
enclosed with the agreement in regard to widths,
curves, camber, super elevation and the longitudinal
gradient as per Para 1603.8.1 of “ Specifications for
Rural Roads”.
10. Carry out the backfill behind retaining wall/breast
wall only after the masonry work of wall has been
approved by the Engineer.
11. Ensure proper longitudinal gradient as per drawings
and all vertical bumps in grades have been removed.
12. Excavate the hill side drain along with hill side
cutting work as per Para 1606.1.3 of MORD
Specifications. Keep the bed level of side Drain at
least 300 mm below the Subbase or drainage layer
or as per desired specifications.
13. Construct the cross drainage works like scuppers or
small culverts alongwith the formation cutting work.
Excavation for catch pit should also be done
simultaneously.
14. Salvage serviceable materials and stack at the
earmarked location.
1. Do not throw debris from excavation/blasting
haphazardly down the hill slope.
2. Do not carry out blasting operation indiscriminately.
3. Do not provide Hair Pin bends at inner curves. Locate
them at stable places having gentle hill slope requiring
lesser height of retaining walls and lesser height of back
cutting
4. Do not stack serviceable stones over Roadway so as to
allow free flow of traffic.
5. Do not allow debris lying along the road.
6. Do not allow bumps or steep grades or reverse grades
in longitudinal section of hill roads.
7. Do not construct retaining walls, which are having
outer curve in plan, specially at hairpin bends. These
are weaker in regard to stability and are easily liable
to collapse. Better break such as walls into segments
to avoid their bulging tendency.
8. Do not allow gradient defects to continue. These must
be got rectified otherwise these will remain for the
whole life of the road.
9. Do not spread the aggregate in very very small
stretches. This may adversely affect the riding quality
of the surface.
10. Do not allow construction of Retaining walls until
proper road geometrics has been achieved in hillcutting
otherwise this may lead to excessive heights
and quantities of R wall masonary creating
unnecessary cost escalation.
11. Do not allow any pilferage of reference level pillars &
back reference pillars. Keep a watch and ward on
reference pillars. If a few level pillars are raised by
about one metre in a continuous stretch, same
geometrics can be achieved. But this will adversely
affect the adjoining jobs where steeper gradient will
occur. Similarly if back-cutting line is shifted to 1.0 m
in front, it will be difficult to judge its correctness but
its overall effects will be less height of cutting and much
more quantity of retaining walls may cause huge cost
escalation.
12. Do not allow gradient steeper than permissible at
hairpin bends. Flatter gradients are always preferable
to steeper gradients at such locations.
13. Do not consider the hill road as complete until it has
been properly compared with the contract drawings
in regard to curve radius & gradient.
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