IS1200 PART 1 EXCAVATION
Classification of
soil
As per IS1200
PART 1
- Soft loose soil
- Hard/dense soils
- Mud excavation
- Soft distingrated Rock
- Hard rock with blasting
- Hard rock without basting
As per CPWD
2009
- All kind of soil
- Ordinary
- Hard Rock
Type of Excavation
A). Surface Dressing: Trimming of natural ground, removing of vegetation and small
inequalities up to depth of 150mm is measured in SQM.
If any tree
is on site how to defines it is tree or brushwood, shrubs If the girth (perimeter
of tana) of tree is less than 300mm than it is shrubs and not extra claimed but
if girth of tree is greater than 300mm than it will be consider in a tree and
you can claim in extra item as per norms and you have to required forest
department permission for cutting it.
The girth
of tree is measured at 1.0 m from NGL.
B). Surface Excavation: Depth up to 300mm is measured in
SQM
C). Rough Excavation: For mass excavation. In this case
we didn’t required to do surface dressing for pcc.
D). Excavation in over area : In this case we have to do properly
levelling of soil, Slop in soil for trenches and properly consolidated soil.
From 300mm to 1.5m depth excavation – 300mm all side of footing extra measurement claimed
as a authorized working space.
Depth of Excavation is exceed 1.5m – 750mm all side of footing extra measurement claimed.
If not
mentioned any term & condition in tender.
E). Excavation in cable
tranches and pipe: In
this case we have to do properly levelling of soil, Slop in soil for trenches
and properly consolidated soil.
1). For up to 1.0 m depth – Width of trench is consider 250mm+out to out
dia of pipe.
2). For up to 2.0 m depth – Width of trench is consider 250mm+out to out
dia of pipe+50mm+50mm (both side of pipe).
3). For up to 2.0 m depth PCC Bed below the pipe – IF 450mm width concrete bed is define for 350mm
out to out diameters pipe than which width is lesser than in condition 2 and 3
it will be considered.
If not
mention any term and condition in tender or contract.
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