G’Day!
description
Transcript of G’Day!
Planning ahead
Learning Objectives
After this lecture you should be able to;• explain why we need to plan for the completion of a
building project• break down a project into a number of activities• prepare a chart (precedence diagram) showing how
these activities relate to each other, i.e. that some must be completed in a certain order whilst others can be carried out independently
• list some of the many considerations that the planner must take into account
Why do project planning?
• To achieve a stated objective in the way best suited to the particular project.
• To estimate what resources, like materials and labour, are needed and when they are needed.
• To provide a method of measuring and comparing actual progress with what was planned.
• To foresee problems and prepare for them.
Planning versus Control
Planning decisions set the objectives to be accomplishedand an agreed program of the activities required toaccomplish that objective. In other words - we must do A,B and C etc to achieve our objective.
Control decisions check the accomplishment of theactivities and the agreed procedure for further activities oreven changes to the objective, if the outcome of eachactivity is not in accordance with the planning decisionsalready made.
Constructability
Constructability is the optimum
integration of construction knowledge
and experience in planning, engineering,
procurement and field operations to
achieve overall project objectives.
(CII 1983)
No Door?
List of activities for a ‘Project’
A. Getting upB. Going to the bathroomC. Getting dressedD. Making breakfastE. Collecting the newspaperF. Eating breakfastG. Reading the paperH. Washing upI. Get briefcaseJ. Leave and lock door
Precedence diagram
A B C D E F
G H I J
Who does the planning?
• Senior management
• Client organization
• Estimating department
• Design team
• Site management team
• Subcontractors
Construction Description or Work List
- Describe your activities- State any assumptions made
Method statement
• Method study techniques
Erection of timber framed partitions in two-storey blocks of units.
Framing material: Timber 35-45 x 90-120 mm.Activity contentStarting point: Material in materials storage areaContent: Transportation Erection of frame including bottom plate, studs, top plate and noggins.Finishing point: Frame ready for claddingWork timeAccumulated work time (t) in hours/m2 for 5000 m2 wall areaAverage area (m2) of each panel 4 5 7 10 15Transportation of materials 0.01 0.01 0.01 0.01 0.01Erection of frames with studs at centres: 0.4 m 0.33 0.30 0.26 0.24 0.21 0.6 m 0.29 0.25 0.22 0.19 0.17 0.9 m 0.25 0.22 0.19 0.16 0.14 Quantity of workCorrection factors for work time at different total quantity of workQuantity of work (m2) 500 1000 2000 5000 10000Correction factor 1.27 1.18 1.10 1.00 0.93
Slower Faster
Learning curve
Time/unit
Number of units
Special considerations
• Small site
• Geotechnical problems
• Remote location
• etc
Activities networks
Precedence network
A B C D E
F G
Arrow & Node network
1 2 3 5 6 7
4
Barchart
Activity 1 2 3 4 5 6 7 8 9 10 11 12 13 DayExcavationFormworkReinforcingConcretingCuringForm stripping
Heartbeat diagram
Activity 1 2 3 4 5 6 7 8 9 10 11 12 13 DayExcavationFormworkReinforcingConcretingCuringForm stripping
Calendar 2007 March April 23 24 25 26 27 28 29 30 31 1 2 3 4 5 6 7 8 9 10 11 12Activity M T W T F S S M T W T F S S M T W T F S S A H B O C L D I
E D F A Y
Linked Barchart (Gantt chart)
A
B
C
D
E
Activity Draw a bar chart based on the following information
Activity Duration (days) Depends on--------------------------------------------------------------------A 5 Can start immediatelyB 5 AC 12 AD 3 CE 6 B and 2/3 of CF 8 B and 2/3 of CG 14 AH 5 D, E, F and G
Solution
5 10 15 20 25 30
A
B
C
D
E
F
G
H