NATIONAL ALUMINIUM COMPANY LIMITED - Rites

e prepared in Auto Cad (latest version). The aanalysis
nalysis shall be done by using STADD PRO /
ANSYS / STRAPP (latest version). However design may be carried out by manually, using
computer worksheets or by using suitable software programmes, as mutually agreed by
Employer/RITES. Final calculations and dr drawings awings shall be submitted in Compact Disc (CD) (2
Sets
3.4 Civil Task drawings indicating various equipment loading and supporting arrangement and
floor loads shall be submitted along with design calculations. Soft copies of all STAAD input
files shall be submitted along with the design calculations for all revisions
3.5 Consolidated B.O.Q. for major items of all Architectural, Civil and Structural works shall be
submitted structure wise and area wise for Employer’s record. However each drawing shall
indicate te approximate quantity of structure (Sectionwise) Concrete (Grade wise) and
reinforcement Diameterwise.)
3.6 Structural steel fabrication drawings to be prepared by the contractor will not be approved
by the Employer/RITES. However, the Contractor for Emp Employer’s loyer’s reference shall submit all
fabrication drawings. Copy of detailed bar bending schedule as prepared by contractor shall
also be submitted to the Engineering and also to Engineer in charge for the reference
3.7 Approval of construction drawings prep prepared ared by the contractor shall not relieve the
Contractor of his responsibility regarding the adequacy of design and correctness of the
drawing.
4.0 WORK DESCRIPTION.
It includes the Civil, Structural and Architectural works related mainly to the following areas
(but not limited to):
4.1 Wagon Tippler Hopper, Machinery Hatches and Underground Tunnel
Wagon Tippler hopper and machinery hatches shall consist of underground portion, which
shall be of R. C. C., and above ground portion, which shall be of structural steel shed covered
with Aluminium Industrial troughed sheets. It essentially consists of R. C. C. frames with R. C.
C. wall panels on the sides and R. C. C. raft at the bottom, fixed to the frames. The top beam
of the R. C. C. frame supports the rail supporting beams and the hopper. Minimum thickness
of R. C. C. raft at bottom shall be 600 mm. Minimum thickness of RCC side walls shall be 600
mm at bottom and 300 mm at top.
No columns shall be provided inside the Machinery Hatches.
The vertical and inclined portion of coal hopper shall be provided with 50 mm thick guniting
(shotcreting). Details of shotcreting have been given elsewhere in this specification
Expansion joints shall be provided at a maximum distance of 40m unless otherw otherwise
instructed. 600 mm wide water stop fabricated with 22G copper plate with bitumen board
fillers and polysulphide sealing compound as specified elsewhere shall be used as expansion
joint material. Floor shall be provided with cross slope not flatter than 1 in 50 towards side
drains. Side drains shall be sloped towards sump where sump pumps as specified elsewhere,
shall be provided. The slope of side drains shall not be flatter than 1 in 400. Arrangement
shall be made for disposal of water right up to the discharge point. Side drains and sump
shall have removable type steel grating cover. Gratings shall be galvanized to grade 610
gm/m.2 Water proofing / Damp proofing of under ground portion of hopper and machinery
hatches, tunnels, underground (i. e. baseme basement) nt) portion of transfer houses shall be done by
providing the following treatments: Chemical injection grouting for inner faces (details as
specified elsewhere). Polymer modified cementitious coating on earth side face as per the
following :
1). On the outer ter surface of walls, frames and roof slabs coming in contact with earth,
polymer modified cementitious coating in two layers as specified and as per manufacturer’s
specifications shall be provided directly on the concrete surface.
(2.) 50 mm thick P. C. C. (1 : 2 : 4 with 10 mm nominal size stone aggregates) shall be
provided under the raft i.e. over the lean concrete, followed by polymer modified
Technical Specification:Sec-7, Civil
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