×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

How to Prepare a Construction Schedule?

How to Prepare a Construction Schedule?

How to Prepare a Construction Schedule?

(OP)
I work on a lot of roadway widening / rehabilition projects for various cities. I alway have a difficult time estimating how long the construction schedule should take. Mostly I estimate it by using previous projects but I don't have any back up to support my duration. Does anyone know of a book (or anything else) that lays out typical durations for typical steps of construction of construction?

RE: How to Prepare a Construction Schedule?

It depends on why you are doing the estimating.  If you are a contractor and you want to estimate for bid purposes, your own internal data will be your best guide...how much time did it take our crews to do this task under similar conditions...historical data.  There are many estimating guides for construction work, but keep in mind those are generalizations. (R.S. Means & Walker's Estimating Guide)

If you are an engineer and you are doing estimates for time, I would certainly couch that as an opinion rather than an estimate...it carries less of a requirement for accuracy than an "estimate".

RE: How to Prepare a Construction Schedule?

I think the difficulty resides more than anything in the amount of resources the contractor is thinking to employ to excute the works. It is more or less attainable to know (to some extent) the produce of the typical teams or machines used for the different construction units. Persist always however the uncertainties of the final dificulties in worrying soils and the amounts of means tasked. So it is not infrequent, specially when time duration is primed in the contract, to find a contractor (or group of them) offering to finish (or if already contracted, finishing) the works in nearly half the time the allowed duration, or "what one would have thought a reasonable period".

This makes difficult that whatever your guess one can be extremely precise about the duration when soil, means, budget, primes and everything that makes the timeframe be affected has significant say. If money is available as thought, and no uncertainties were extant, it would be only to sum the compatible time use of a number of means assumed in the project. But that still would be assumption.

Seen otherwise, perhaps priming is one interesting way of approximating the timeframe to some wanted; the contractor would have incentive to allocate means enough to approach the timeframe, and conversely, the more suitable contractors to the work would be more interested in it because knowing their advantage, they can think on the incentive both as a partial assurance to get the contract and as well, of keeping some minimum benefit, and so would make the bidding process more selective from a target date viewpoint.

RE: How to Prepare a Construction Schedule?

project durations are based on the size of the crews and number of pieces of equipment in addition to the size and layout of the job. Generally, larger crew and more equipment means faster schedule and higher cost. However, some items such as procurement just can't be rushed and mother nature will always help with lengthening the schedule. Without an in-depth analysis of the actual work plan, you will be guessing at best.  

RE: How to Prepare a Construction Schedule?

Project size, locality, aspects ... are some of the influential factors. It takes time to nurture a good estimator, therefore, I think they being paid well.

RE: How to Prepare a Construction Schedule?

This text is a comprehensive reference for project scheduling. It includes complete coverage of scheduling from the basics to advanced applications along with a detailed tutorial on the four most popular software programs; Primavera Project Planner, SureTrak, P3e/c, and Microsoft Project.

Construction Scheduling: Principles and Practices by Jay S. Newitt ISBN: 9780766808973
 
The Demlar books are also good:

Construction Scheduling with Suretrak
by David A Marchman ISBN: 9780766808973
 

RE: How to Prepare a Construction Schedule?


.

Open Workbench is a completely free project scheduling/management alternative to Microsoft Project and other such software applications...

http://www.openworkbench.org

.

 

tsgrue: site engineering, stormwater
management, landscape design, ecosystem
rehabilitation, mathematical simulation
http://hhwq.blogspot.com

RE: How to Prepare a Construction Schedule?

you develop a basic bar chart schedule w/ the computer programs listed above (takes a little getting used to them but not a lot)  you can develop a duration for each construction activity by estimating the quantity of work divided by an estimated production rate (either from your own work history Or a generic guide like http://rsmeans.reedconstructiondata.com/    )

hope that helps

RE: How to Prepare a Construction Schedule?

Microsoft Project is a good Construction Management Software

RE: How to Prepare a Construction Schedule?

If you work in the northern climates, construction time is based on the length of the season.

Another way of making a "back of the envelope" estimate is based on dollars/time. How long did the last project take vs how much did it cost? Very crude indeed, but it is a way of making a quick estimate. Then you can adjust based on the variables of the particular project.
 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources