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Chapter 1.
1.4.3.
Marking the Second Datum Line
The second datum line should be perpendicular to the first datum line. To
ensure this, the 3-4-5-triangle rule is adopted and the second datum line is
drawn passing through the reference point.
With a steel tape measure a length of 900mm or a multiple of 300mm (say
Nx300mmm) from the reference point and mark a point on the first datum
line. Let us call this point as 'Y'. (Fig. 1.2).
From the reference point 'X' draw an arc at a distance of 1200mm or a
multiple of 400mm (say Nx400 mm) in the direction approximately
perpendicular to the first datum line. To draw an arc use a pen tied to one
end of a string. Draw another arc at a distance of 1500mm or a multiple of
500mm (say Nx500mm) from the point 'Y' on the first datum line such that it
intersects the earlier arc. Let us call the intersection point as 'Z'. Obtain
several points in a similar way. Draw a line from the reference point such
that it passes through maximum number of these points. To draw the line
use the string dipped in ultra marine indigo or blue ink.
Fix some brass screws along the datum lines with a clearance of 2M between
them.
1.5.
MARKING OF SUITE LINES & GROUTING HOLES
The suite lines are drawn as shown in Fig. 1.3 as per the procedure outlined in
section 1.4. The length and width of a full suite are 8590 mm and 624 mm
respectively. The inter-suite distance is maintained at 1000 mm. The clearance
between wall and first suite is fixed at 1000 mm. The minimum clearance between
the wall and the last suite shall be more than 1000 mm.
1.5.1.
Marking of Suite Lines
Draw a line parallel to the second datum line at a distance of 1600 mm from
it. This is referred to as the suite end line as shown in Fig. 1.3. Now draw a
line at a distance of 400 mm from and parallel to the first datum line. This is
referred as the suite line. Now other suite lines can be drawn parallel to this
suite line at a distance of 624 mm, 1624 mm, 2248 mm, 3248 mm, 3872 mm,
4872 mm, 5496 mm, 6496 mm and 7120 mm. These suite lines should be of
8590 mm length.
1.5.2.
Marking of Grouting Holes
Fig. 1.3 shows a typical switch room grouting hole markings for a five suite
configuration of C-DOT MAX-XL. These holes are used for fixing the iron
work on the floor.
12
C-DOT DSS MAX-XL
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