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Technical Proposal for the Level Difference of Steel Structure
in 4th
and
Roof Floor Level
1.
Necessity
As per the structural steel drawings (IFC and Shop drawings)
from in fourth level and in roof
Level, RHS 250x150x12.5 Box members which are outside in 3 cases
are 150mm above other
members. Following are the Locations
a.
Along Grid : D1 to Grid A3 outside Grid 0.9
b.
Along Grid: E to B1 outside Grid 13
c.
Along Grid: 13 to 10 outside Grid C
2. Analysis
Upon detailed analysis it can be concluded that there are
curtain wall in this locations inmajority area and in once case
near Abattoir Room in fourth Floor, this area in inside the
building with block work around. These cases are classified as
Case 1 and 2 respectively and the
details are enclosed. We have enclosed layout of Fourth floor
with Architectural drawings and
Structural steel drawings super imposed and section of Case 1
and 2 are highlighted.
For the sake of identification, quick review and understanding
of the section drawings, existing
steel members are colored blue and new steel members are colored
red.
3. Basis of Proposal
This proposal is made with due respects to the design intent and
no changes to the flooring
level, ceiling level and faade is required. Only structural
modifications for the decking system
are made and the details are enclosed. In principle a 6 mm thick
MS sheet (either Plain or
chequered) is proposed between the outer ring member HEB 240 and
the inside member HEB
500 between the RHS members. Where the curtain wall is coming in
order to fix the bottom
bracket for the mullion we have added another UPN 100 member to
which the bracket will be
fixed with Bolts & Separation membrane
4. Related changes
The curtain wall in these locations is proposed at a distance of
100 mm outside the specified
alignment so as to ensure that the top transom is not hindered
by the connection members of
steel structure.
In the 3rd
floor and 4th
floor, curtain wall W 21a and W22a respectively will not be
continuous
unlike shown in the South Elevation side which can be a
discrepancy in the drawing
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5.
Connections
The UPN channel section is proposed to be connected to the RHS
250x150 members with cleat
angle of 200x200 welded to Box and channel from either side. The
top level of the channel is
proposed flush against the Box members and MS Sheet will be
above this.
6. Supporting Drawings
a)
Super imposed drawings Structural Steel and Architectural -
Locations highlighted
b)
Proposal Plan ( 2 Sheets)
c)
Proposal Section Case 1
d)
Proposal Section Case 2
e)
Proposal Blown up section
