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Types of Floats in a Construction Project

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Construction Scheduling

Колумбийский университет

4.8 (оценок: 808) | Зарегистрировано учащихся: 10K

Курс 2 из 4 — Управление строительством Специализация

Learners will discover the key project scheduling techniques and procedures including; how to create a network diagram, how to define the importance of the critical path in a project network, and defining project activities float. Also covered are the fundamentals of Bar Charts, Precedence Diagrams, Activity on Arrow, PERT, Range Estimating, and linear project operations and the line of balance.

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Получаемые навыки

Schedule, Linear Scheduling Method, Program Evaluation And Review Technique (PERT), Critical Path Method

Рецензии

4.8 (оценок: 808)

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AY

Aug 11, 2018

Amazing course! I've learned a lot from Dr. Odeh and all the stuff are very skilled and have a lot of knowledge. Thank you so much for such a great Course.

EJ

Apr 20, 2019

I am challenging myself in ways I did not know was possible. This course, so far, has been inspirational for me both personally and professionally.

Из урока

Activity Floats

Professor Odeh introduces the types of floats in a construction project including; total float, free float, interfering float and independent float.

Types of Floats in a Construction Project9:48

Activity Floats9:37

Determining Total Float and Free Float6:31

Introduction to the Interfering Float9:18

Independent Float9:17

Преподаватели

Ibrahim Odeh, Ph.D., MBA
Instructor, Department of Civil Engineering and Engineering Mechanics, Columbia University

Текст видео

I will be covering in this module the construction floats and

the type of floats that we do have in our construction projects.

There are several types of Floats that we used in the construction.

Mostly, what we used most of the time the first two types of

floats which is the total float and the free float.

However, you might be while you are studying either in a textbook or

reading couple of papers, you might find another two definitions referring to

as interfering float or interference float and

the independent float which I will also touch base on them just quickly,

so as you have an idea about all these types of floats and what they mean.

So let's start with the first one.

The total float and it is actually what we are aware of in our industry and

it is commonly used name as or referred to as the float.

So if you hear something or you hear someone say, okay,

what's the float of a specific activity or your project,

that's the first tool as the Total Float by default.

And the Total Float is also known as the slack or

the buffer of a specific construction task or

construction activity, and the slack or

float provide the flexibility in the project schedule.

And when leveraged properly, construction managers and

the PM on the project can shift activities and construction resources.

To meet the project objectives and

properties which we will be talking about it for later, as an example.

So for definition on total float I like to use this definition which is.

The total amount of time that is specific construction activity that say I,

the starting date or the finishing date of that activity.

Can be delayed without affecting the overall completion

of the construction project itself or

to cause delay in the project's finish date.

Mathematically speaking the total flow out of activity A or

Y or X or Z is the late start

of that activity minus the earliest start of that

activity or sometimes which will give you the same answer.

The total float of the specific activity will be the late finish of

that specific activity minus early finish of that activity.

So I want you to think based on this definition here and

the mathematical equation we gave for the Total Float.

On what is the Total Float,

of any critical activity.

Also, think about the following question.

If an activity that delayed from

it's early start, by more than it's total float.

What could happen?

So 2 questions.

What is the total float of any critical activity?

And if an activity got delayed from its early start by more than the total float,

what could happen here?

So the answer for that is, the total float of a critical activity,

will be always zero.

If you remember, when we covered the forward and

the backward task calculations.

We highlighted that the latest start and

the early start, they are equal for critical activities.

And the late finish as well as the early finish.

The same, they are equal so

the total float is also zero if it is a critical activity.

And we will go through a couple of examples shortly.

The other question I ask you if an activity got delayed

from its early start for more than its total float,

it will affect in this case the duration,

or the finish date of the entire project

that's why by definition we said that the total flow is the maximum number.

Number of days that an activity can be delayed without

affecting the finish time or

date of the entire construction project that you are working at.

That's for a total float.

The free float on the other hand is

the definition, the amount of time that an activity.

Let's say activity A or I can be delayed without delaying.

The early start of any immediately or

immediate following activities, the successors.

Before I go to the mathematical, I want to add to that is that free float in this

case of any activity, is the difference between That

minimum early start date of its successors

as we can see here, and its own early finish date.

So, when we say the finish, the free float of activity,

I plus one refers to the successor at

the successors' activities that following I.

You find the minimum early start of all these successors and

you subtract it from the early finished of the activity

itself that I'm trying to find free float to.

So the free float i'm finding it,

calculating it to study how late or

how buffer time I have the duration find my have.

That I can delay it without affecting

the immediate successors of that specific activity.

So if I want to do kind of a quick comparison between both

the Total Float and Free Float, because there is always questions between both.

The Total Float more focused on the project finish date.

The free float focusing on the early start date of any successor activity.

This is one, this is two different things.

Okay?

And an assumption here, we're highlighting for the Total Float and

the Free Float that the Total Float for activity A,

let's say, it shows the following, all activities

predecessors to the activity you are calculating the total float for

began as early as possible, in their early start dates.

All the predecessors and

all the successors' activities began as late as possible.

That's an assumption that highlighted for the total float.

Because it's the most relaxed float we have between all types of floats.

The free float is more restrict.

The assumption for it also shows that all predecessors and

all successors of activity A or

the activity you're trying to find the free float for or calculate it.

Begin as early as possible.

In the early start and the activity itself, activity A,

ends as early as possible

at early finish, and we will

talk in more details through examples on numbers to better understand that.

So, if I want to sum it up from this slide, the total float

Is the amount of time that an activity can be delayed

from its early start date without delaying the project finish date.

The free flow Is the amount

of time that an activity can be delayed without delaying

the early start date of any successive activity.

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