Civil Engineering Reference
In-Depth Information
Exercise 4 solution
10.0 m
5.1 m
4.9 m
X
300
mm
B
500 mm
z12
(Both ends)
SECTION X-X
z12
z12
z12
z12
X
(Both ends)
A
All cope-holes R20mm
Flanges
Web
End plates
15
mm
10
mm
20
mm
WHY NOT HIRE
A LONGER TRUCK?!
D
z12
z12
100
100
(200)
(200)
All web-to-flange
joints except site welds
C
17.9
Exercise 4 solution. The dimensions shown in the welding symbols are in millimetres.
Comments
In
Fig. 17.9
:
A
cope holes have been introduced to avoid the need to dress welds
where they meet other welds and avoid welding up into corners,
often a site for defects. Eight cope holes R20 mm are used.
B
a weld all round symbol cannot be used for the end of the flange
joints as it cannot go over the top and bottom of the flanges. Also,
it is interrupted by the cope holes.
C
there are four web to flange joints which would need four arrow
lines if they were to be shown individually.
The spacing in ISO is not the pitch (here 300 mm) but the dis-
tance between the weld elements (here 300 - 100 = 200 mm).
D
a suggestion to be taken seriously! Apart from simplifying the
drawing, complete shop fabrication can reduce considerably the
costs of welding and quality assurance.
However, as a 10 metre beam is being fabricated in two halves
by manual welding, the fabricator may not have the space avail-
able or the handling facilities for a long beam and access from the
fabrication shop or at the site maybe restricted. Again it is empha-
sised that cooperation between the design office and the fabrica-
tion shop and also the site office is essential.
