Civil Engineering Reference
In-Depth Information
Relationships when linking operations
Dur1 2345678910
11
12
Operation
(Operation A must finish before operation B starts)
Finish to start
4d
A-Clear site
B-Excavate Fdts
5d
(Operation D can start 2 days after operation C has started)
Start to start
3d
C-Concrete Fdts
(Operation E can start 3 days
after operation D has started)
4d
D-Bricwork to DPC
3d
E-Hardcore fill to slab
This allows for the overlapping of operations
Finish to finish
F-Roof purlins
6d
G-Roof insulation
5d
H-Roof covering
3d
Roof insulation must finish 2 days after purlins in order
for roof coverings to commence on day 9
These relationships are practical links between related operations occurring during
the construction process.
Start to start relationships allow the overlapping of related operations. Overlaps
are difficult to express on a network diagram as activities need splitting into separate
parts. This complicates the network (circle and link) diagram and may prove complex
to analyse.
3.3 Procurement programmes
The preparation of procurement programmes is an integral part of the programming
and control process. This is of particular importance on design and build and man-
agement contracts.
In many contract situations the main contactor is responsible for appointing,
organising and managing named and domestic subcontractors.
