İnşaat Mühendisliği

How Can You Save Wastage at the Construction Site?

Lets first look at the various inefficiencies that lead to wastage in resources of various forms in construction:

•Rework due to honeycomb in column/ slab

•Performing work out of sequence

•Use excess mortar/ chipping floor due to level difference

•Forget dowels insertion in reinforcement for beam etc

•Shifting scrap many times before disposing

•Delay in information flow due to communication gap between design- office – site.

•Errors or omissions in drawings

•Mismatch between drawing & specifications

•Delay in material or shop drawings approval

•Delay in finalising vendors/ procurement

•Spending too much time in searching, locating and sorting stirrups or scaffolding/ shuttering parts

•Unsuccessful searches for materials or machinery resulting in wasted supervisory time, crew idle time, disruptions in daily plans

•Bought out item waiting at vendors store due to space constraint at site

•Shipping, transportation, unloading and on-site storage done without considering execution sequence

•Double handling of materials – unload near gate, move closer to site then to the work location

•Extended working hours for managers, engineers, supervisors

•Finding too many workers in one area such that no one can work properly

•One trade waiting for other to complete the work

•Disconnect within Master Schedule (Design/ Drawing Schedule, Procurement Schedule & Execution schedule)

•Project Manager spends 50% of time for arranging contractors/ work OR Site engineer spends 50% of his time on follow-up with workers OR manager/ engineer spends 40% of time for procurement follow-up

These are not exhaustive but cover the most common forms of inefficiencies in projects.

Now lets categorise these into the different types of waste in construction or for any project for that matter

7 Wastes in Construction-

•Waiting or Delay (Inactivity that occurs because a preceding activity didn’t finish on time)

•Rework or Defect (Anything not done correctly the first time)

•Over Processing (Unnecessary steps in operations, such as reprocessing, double-handling and double-checking which adds no value)

•Over Production (Producing more than needed, faster than needed or before it is needed)

•Motion (To move and add value is called work. To move and not add value is called motion)

•Transportation (Unnecessary motion or movement of materials)

•Inventory (Excess or shortage)

And last but not least:

Value vs Waste

Value -the client cares that it is being done

Waste -not valuable to the client

Waste Results in Under Utilisation of Resources

One way to control waste is by using the 5S method – which is a workplace organisation methodology. It is short for, Sorting, Simplifying, Sweeping, Standardising & Sustaining.

5S is not a one time activity

Motivation & Self discipline are required

5S can help us to separate “be busy” and “be effective”

5S can help to identify and eliminate wastes

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