NATIONAL ALUMINIUM COMPANY LIMITED - Rites

) Suitable access staircase with safety hand railing shall be provided to all floors of junction
houses.
s) Wall sheeting shall generally start from the lowest working floor and extend up to roof level
with louvers at each h floor level to ensure adequate natural ventilation.
t) Monorails for maintenance hoists shall be provided for maintenance and repair of various
equipments located on the floors.
18.2 Components of structures
a) Gallery Trusses and Roof
Gallery truss shall be of latticed type construction. The trusses shall be adequately braced at
top and bottom chord level to transfer the horizontal wind forces to end portals.
b) Stringer Beam
These beams shall be suitably spaced to support the conveyor stringer supports and shall
transfer load to gallery. Walkways on either side of the conveyor shall also be supported on
these stringer beams.
c) Supporting Trestles
Intermediate trestles shall be two legged and shall deliver loads from gallery trusses to the
foundations. In addition, four legged trestles shall be provided which will act as fixed support
to transmit all longitudinal forces between expansion block, in addition to other forces.
d) Junction Houses
i) Floors - Floor beam layout shall be arranged to suit equipment llayout
ayout as well as equipment
anchoring system.
ii) Columns - In addition to loads from floor and roof, columns shall be designed to transmit
horizontal load due to belt tension/snapping of belts to the foundation.
e) Belt Tensioning Device
Suitable structures shall be provided to accommodate belt belt-tensioning tensioning device which may be
located either under the conveyor gallery or in the junction house itself.
f) Wall Structures
(i) Wall runners with necessary sag rods shall be provided to support wall sheeting in
conveyor galleries and junction houses.
(ii) Walls shall be provided with louvers and translucent sheeting at appropriate levels,
to provide natural ventilation and lighting.
g) Access stairs, walkways, platforms, ladders, hand railing etc.
Technical Specification:Sec-4,System System Parameters, Operation & Control Philosophy
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