Tag Archives: Foundation

Footing depth in case of a BC soil? 

Hello Friends, 

You must have heard about the black cotton soil. It’s also known as the bc soil. It expands when it comes in contact with the water and shrinks when the water dries up. 


So now the question is how to decide the depth of footing in case of bc soil? 

Read through this article for the complete information about this aspect. 

https://www.quora.com/In-black-soil-what-should-be-the-minimum-depth-of-footing/answer/Santosh-Kulkarni-37?share=7dab63a9&srid=zM5g

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Footings : Levelling Course & Water Logging :

Dear Friends ,

Let us solve the query of one of the readers today.

This is the query :

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In fact , there are two queries here :

  1. When do we use Plain Concrete in a footing ?
  2. Ground Water seepage during excavation ?

Let us solve these queries one by one.

First query is about the Plain cement Concrete .

Please have a look at the section of the Footing as given in the RCC drawing :

The PCC is marked here with Red :

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Now have a look at the base of a pit . This is how the surface shall be at the base of the excavation :

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It shall be very clumsy to lay the rebars on such a muddy surface. Right ? Thats why we provide a certain thickness of plain cement concrete here . This concrete is also known as the ” LEVELLING COURSE “.

So the Levelling course is a layer of Plain cement concrete which is given so that we get a good working surface for laying the footing properly. 

Now have a look at the leveling course laid on a site :

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Next step is to lay the Rebars of the Footings :

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Parallely , the shuttering for the footing is also fixed on the Levelling course.

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Now we do casting of the Footing so that it becomes the RCC footing .

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Hope the first query is clarified.

Now second query pertains to the Water logging during excavation.

You can have a condition like this on the site :

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So what do we do in such a case ?

Simple.

We have dewatering pumps and take out the water before laying the Levelling course :

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There might be a case like this also :

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So now , may be we shall have to wait for a dry spell so that this water either gets absorbed in the soil below or is evaporated.

In a situation , when the excavated pit is not completely dried, it shall not be possible to lay the plain cement concrete in the mud.

What do we do then ?

In such a case , we shall have to do Boulder solling so that we get a good ,

solid working surface .

Look at the stake of Boulders which are also known as Rubble or Stone :

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These boulders , when laid in the base of a pit , shall look like this :

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After this , the levelling course is laid in plain cement concrete. This is followed by the RCC footing.

Hope both the queries are clarified now.

Thank you for asking the queries .

Blog Stats as on date :

 

WHAT ? COST FOR A MATT ?

Good Afternoon Friends ,

Wish you all a very CONSTRUCTIVE NEW YEAR 2017.

We are meeting for the first time in this new year.

Here is an interesting question for you !

First try your hand on this and when solved, look at the solution given below .

Best of luck !

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Friends , this is the blog statistics as on date :

 

 

COLUMN BARS ? ITS DIFFICULT ?

Dear Fellow friends ,

I would like to personally greet the following readers who have  started following this blog since yesterday [ 5th August 2016 ]
1.AMOL AMRUTKAR
2.ANIQUE BIYABANI
3.ABHISHEK DHAMANE
4.KETAN MAHAJAN
5.NITESH VALVI
6.RAJDEEP BISHT
7.SACHIN PAWAR .
Most welcome friends and hope you enjoy reading these posts.

This is the status of the blog as on date :

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Thank you every one for your continuous support to this blog.

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WHAT ?TRAPEZOIDAL FOOTING ?

Hello dear Friends ,

Good morning to all of you !

Let us give a big hand to the fellow readers who have recently joined us in this blog.

Today friends , you are going to analyze a complete Trapezoidal footing with me !

Ready ?

So here is the example for you .

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CUTTING LENGTH ? WHATS THIS ?

Dear Friends ,

We are now going through the fundamentals of Reinforcement calculations at site.

These are simple tips which shall help us to understand the complexity of drawings in a simple way.

Also read these posts for quick reference ;

Basics of re-bars

Re-bars

Weight of rebars

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