GDay Stefan Hrnlund University of South Australia stefan

G’Day! Stefan Hörnlund University of South Australia stefan. hornlund@unisa. edu. au

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 accomplished an agreed program of the activities required to accomplish that objective. In other words - we must do A, B and C etc to achieve our objective. Control decisions check the accomplishment of the activities and the agreed procedure for further activities or even changes to the objective, if the outcome of each activity is not in accordance with the planning decisions already made.

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 up B. Going to the bathroom C. Getting dressed D. Making breakfast E. Collecting the newspaper F. Eating breakfast G. Reading the paper H. Washing up I. Get briefcase J. 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 content Starting point: Material in materials storage area Content: Transportation Erection of frame including bottom plate, studs, top plate and noggins. Finishing point: Frame ready for cladding Work time Accumulated work time (t) in hours/m 2 for 5000 m 2 wall area Average area (m 2) of each panel 4 5 7 10 15 Transportation of materials 0. 01 Erection 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 work Correction factors for work time at different total quantity of work Quantity of work (m 2) 500 1000 2000 5000 10000 Correction 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 F G Arrow & Node network 1 2 3 5 4 E 6 7

Barchart Activity Excavation Formwork Reinforcing Concreting Curing Form stripping 1 2 3 4 5 6 7 8 9 10 11 12 13 Day

Heartbeat diagram Activity Excavation Formwork Reinforcing Concreting Curing Form stripping 1 2 3 4 5 6 7 8 9 10 11 12 13 Day

Calendar Activity A B C D E F 2007 March April 23 24 25 26 27 28 29 30 31 1 2 3 4 5 6 7 8 9 10 11 12 M T W T F S S H O L I D 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 immediately B 5 A C 12 A D 3 C E 6 B and 2/3 of C F 8 B and 2/3 of C G 14 A H 5 D, E, F and G

Solution 5 A B C D E F G H 10 15 20 25 30