SAIL General Technical Specification - Engineering Projects India Ltd.

20.6 Steel Pipes
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General Technical Specification
Steel pipes and fittings used for encasing shall conform to IS : 1239 (Part 1&2) - 1990 to
1992 medium Class upto 150 mm dia and as per IS : 3589 - 1991 for pipes of dia 200
mm and above. For pies of dia 200 mm and above fittings, if required shall be fabricated
from pipes itself.
20.7 Cast Iron Manhole Covers & Frames
21.0 ROAD
21.1 General
21.2 Soling Stones
These shall be of medium or heavy duty (M.D. or H.D.) as specified in Schedule of Item and
of Cast Iron with raised chequered design, lifting key and key hole and shall be coated with
black bituminous base material. Medium duty covers and frames shall be either of circular
type with 500 mm clear opening and minimum weight of cover and frame 116 Kg and 128
Kg respectively or of rectangular type with minimum weight of cover and frame 144 Kg.
Heavy duty covers and frames shall be either of circular type with clear openings of 500 and
560 mm and 170 and 208 Kg weight respectively or of double triangular type with clear
openings of 500 and 560 mm and 229 and 255 Kg weight respectively.
The CI manhole cover and frames shall conform to IS : 1726 - 1991.
Roads in this project shall be of RCC confirming to relevant standards.
Material for soling shall be natural stone boulders or crushed blast furnace slab. Stones for
soling shall be of height equal to thickness of the soling with tolerance of plus or minus
25mm and shall not have a base area of less than 250 sq.cm. nor more than 500 sq.cm.
and the smallest dimension of any stone shall not be less than half the largest dimension.
Stones shall be tough, angular, durable and generally free from flat, elongated, soft and
disintegrated particles. They shall also be free from dirt or other objectionable matter and be
obtained from quarries approved by the Engineer.
Crushed slag obtained from air-cooled blast furnaces slag shall be angular, of reasonably
uniform quality and density and generally be free from any thin, elongated, and soft pieces,
dirt or other objection able matter. The density of slag should not be less than 1.12 gm/cc
and glassy material shall not exceed 20%. Water absorption when determined in
accordance with IS:2386 (Part-III) - 1963. "Methods of Tests for Aggregates for Concrete :
Specific Gravity, Density Voids, Absorption and Bulking", shall not exceed 10%.
21.3 Coarse Aggregate for Water Bound Macadam
Coarse aggregate for water bound macadam shall be natural gravel, crushed stone
obtained from approved quarries or crushed blast furnace slag. Crushed stone shall be
hard, durable, tough and of uniform quality, generally free from flat, elongated, soft and
disintegrated particles. It shall have sharp edges and also not have excess of dirt and other
objectionable matter. When tested as per IS: 2386 (Part-IV) - 1963 for Los Angeles
Abrasion Value or Aggregate Impact Value, the limiting values shall be 50% and 40%
respectively for base course and 40% and 30% respectively for surfacing course. The
flakiness index shall not exceed 15% when tested in accordance with IS: 2386 (Part-I)-1963
"Methods of Test for Aggregates for Concrete : Particle size and Shape". Crushed slag
aggregates shall meet the requirements given for soling stones from blast furnace slag.
Civil
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GS-07