Lecture 3 - Programming Techniques 2 PDF

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Summary

Contractors planning and estimating. Lecture 3 - Programming techniques. Achieved a 1st in this module Lecturer Dr Martin Tuli. Lecture duration 2 hours...

Description

Programming Techniques Line of balance: 

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What is it? o Used for Repetitive construction e.g. housing or multi-storey buildings Typical calculations o Project duration o Does not give critical path or float

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In this diagram the next house foundations start just after the previous houses foundations and so on One gang finishes one activity and moves onto the next house

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Challenge when you have two different trades at two different rates Activities cannot be allowed to cross Buffers make sure the activities don’t overlap Start at 0,1 because you cant have 0 houses

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Line of balance end result:

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You can have activities going on simultaneously, which is why some of the bars are split into two and three. These activities can go on at the same time without getting in the way of each other

Constructing Line of Balance schedules:  

Calculate activity duration Place buffer in appropriate place

Recording progress/ monitoring  

Shade activities completed per house Shows progress and monitoring

Multi-storey repetitive construction:    

Show common activities as a horizontal bar Typically foundations and roof as these are one off activities compared to building the frame which will have to be completed over each floor within the building Activities may slant in a different direction if they start at the top and finish at the bottom e.g. cleaning Does not take into account the learning curve – At the start of a job you might be slow, after you have repeated this job multiple times and will get quicker at the job

Time chainage diagrams:  

Time location diagrams For linear projects o Roads o Railway o Tunnels

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Used for repetitive construction, for a long duration

Line of balance and time chainage: 

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Advantages o Rate of work clear o Clearly shows number of units to be completed by a certain date o Looks really good Disadvantages o Only for repetitive projects o Summary only, short on detail, only tells you start end and what it is o Does not show logical relationships, critical path and float o Can get a bit confusing, lots to interpret

PERT Diagrams – Programme Evaluation and review technique:  

How certain are you that the project will finish on time – Looks at probabilities of being delayed on time etc. Make assumptions that activities will finish on time, however activities often get delayed

PERT Probabilities:

Computer aided (construction programming):  

No industry standard Main software packages o Primavera o PowerProject  Newer versions coming out every year  Made by planners for planners

o

MS Project

Asta Powerproject vs Microsoft project: 

In my opinion Asta poowerproject is a superior product for construction projects. Both pieces of software can achieve much the same results and are just as feature packed and powerful, but in my opinion the end result is easier to achieve in Asta Powerproject – Planner, Marriot construction

What programming software can do:       

Produce construction programmes Calculate critical path Calculate float (Total and Free) Use calendars Resource analysis Costing Monitoring and control

Expectations for future development: 

Integration o One input, different outputs to different software packages o Link with 3D = 4D and BIM

Advantages of programming software:    

Ease of data entry Easy to manipulate data Speed of report generation Quality of presentation – Looks professional – is it useful though?

Disadvantages of programming software: 

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High costs o Of the software o Going on courses to train employees Software selection Technical support...