Home -> Forums -> Construction -> Pillar Work -> Laping length requirement

Laping length requirement

Sat Aug 29, 2015Total posts : 5
bala
bala
Join date: Jul 2014
Topic: Laping length requirement

Dear friends,
This is regarding the lapping requirement.
We are doing construction work in the first floor . So for raising the pillar we need to have lapping of steel . So how much lapping length to be made .
As per some searching we are telling that 5 times of thickness for length (as minimum 50 *16 mm= 800 mm = 80 cm ) 

But contractors saying as per their experience min 50 cm 

Please suggest your view 

Thanks 

Mon Aug 31, 2015Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Bala
         

There should be no joints in steel bars used for RCC work. If it is necessary to use small length steel bars, proper overlap should be given.


The joints of bars should be welded in case the diameter of bars is more than 36 mm. Overlapping of bars should not touch each other and they should be kept apart. Where it is not possible, overlapping bars should be bound together at intervals not exceeding twice the diameter of such bars with two strands of steel wires trusted tight. The overlap should be staggered for different bars. The length of overlap should not be less than 50 times the diameter of steel bar.

2) Precautions while Bending, Binding and Placing Steel Bars in RCC Work

  • Steel bars are clear, free from loose mil scales, dust, loose rust and any oily materials.
  • The bars used at site are manufactured from reputed brand and have a full length.
  • Use full length steel bars in beams, slabs etc if not possible, proper overlap should be given in steel bar and overlap should be staggered.
  • Tor, ribbed and twisted steel bars are used as they have more tensile stress. Also they are economical and have more strength in cement concrete.
  • The bars must be in full length according to the design.
  • Proper sizes/ height of crank bars are given in slab and beams etc.
  • Proper support under crank bars of beams and slabs must be given.
  • Steel bars are not disturbed while lying cement concrete.
  • If steel bars are more in number in beams, the bars are placed in two layers by giving spacer between the layers.

 

3) Checklist/Points before Laying Cement Concrete

  • Form work /shuttering should be checked for line, level and its strength.
  • Steel bars and their placing should be checked.
  • Proper cover to steel bars and adequate numbers of sports/chairs under crank bars must be checked.
  • Proper planks or plates provided for walking over reinforcement are not disturbed during working.
  • Raw materials should be proper and sufficient in quantity.
  • Electrical pipes, fan box etc. should be laid before lying cement concrete.
  • Gap in shuttering plates is sealed properly by jute bags /mortar /rubber etc.
  • Shuttering plates are properly oiled.
  • Curing arrangement must be checked in advance for smooth curing after laying RCC slab.
  • Precautionary arrangements are taken in case of rains etc.

Mass Concrete
Mass concrete means cement concrete used for constructions of dams, massive structures, raft slabs and heavy structure beam foundation. There should be rigid/strict control on concrete work with view to ensure durability, strength, and uniformity. In big projects detailed specification is issued separately for individual project according to site requirement and other situation at site of work. Mass concrete is used in important project having heavy load and different types of stresses. Any small deviation in specifications or any irregularity omitted or committed may cause failure of the structure.

 



24  Comment(s)

N.S.BISHT
By N.S.BISHT -  On  6/29/2015 10:34:59 AM
What is the ratio of Cement, crushed Stone& Sand and size of stone in Concrete.
 

Anonymous
By Anonymous - On 1/15/2014 8:15:23 PM
Now constructing 2BHK on ground and want to go in for 2 single bedroom houses on first floor. Should we provide concealing beams. What should be the thickness of moulding.
 

Anonymous
By Anonymous - On 9/19/2013 9:49:36 AM
This article is very helpful because it is very simple sentence.
 

Anonymous
By Anonymous - On 8/23/2013 7:58:08 PM
extremely infirmative......keep up the good work...
 

Anonymous
By Anonymous - On 4/8/2013 11:04:10 AM
your site teach like a civil engineering professor i respect your people and your company
 

ssrinivasan
By ssrinivasan -  On  8/20/2011 7:27:18 PM
How to maintain the correct length and line of various columns?
 

Anonymous
By Anonymous - On 2/14/2011 4:15:23 PM
It is very very useful for all type of technicians/ engineers related to this field and even for a novice. Its a basket of knowledge to share.I gained lot of knowledge.
 

Manoj Kumar Verma
By Manoj Kumar Verma -  On  12/29/2010 12:28:33 PM
this site is really a lot working in a comman man, i like to suggest all my friends to have precious knowledge through this site thanks a lot ghar expert team
 

vijayakumar G
By vijayakumar G -  On  12/27/2010 8:13:21 AM
Sir,
I need the proper detail of mixing details(ratios) for each concrete work & brickwork.
Please specify the ratio details of each work
 

Anonymous
By Anonymous - On 11/10/2010 12:22:28 PM
This was a very valuable information..in fact ghar expert is a very good site
 

Anonymous
By Anonymous - On 8/21/2010 1:16:33 AM
the given tips are very helpful for technical and even a layman person can takes use of it.
it will be great if you add pls soje technical terms as crank length, cantilever precauctions, some useful structure behavior tips,
with regards
Ar.Gurpreet Arora
 

Ahmed Raza
By Ahmed Raza -  On  7/24/2010 1:49:58 AM
Herewith i would like to ask the quantity steel, cement, aggregate, water, sand, chemical in per cubic meter for columns or beams. thanks
 

shivprasad
By shivprasad -  On  5/19/2010 7:51:03 PM
i am constructed the round wall of diameter 30 feet & 30 feet height & 4.5 inch width,so please say what quantity of material to be use for cement concrete (useing steel).
 

shivprasad
By shivprasad -  On  5/19/2010 7:50:19 PM
i am constructed the round wall of diameter 30 feet & 30 feet height & 4.5 inch width,so please say what quantity of material to be use for cement concrete (useing steel).
 

shivprasad
By shivprasad -  On  5/19/2010 7:50:02 PM
i am constructed the round wall of diameter 30 feet & 30 feet height & 4.5 inch width,so please say what quantity of material to be use for cement concrete (useing steel).
 

tkalaiva
By tkalaiva -  On  3/6/2010 7:06:01 PM
I WOULD LIKE TO KNOW HOW MUCH RE INFORMCENT STEEL SPACING REQUIRED FOR Residential build (Indipedent house)
 

NAGENDRA SRIVASTAVA
By NAGENDRA SRIVASTAVA -  On  1/9/2010 10:38:15 AM
IF THERE IS ANY PROCEDURE TO PAINT THE STEEL BARS BEFORE USING IT IN COLOMNS AND BEAMS.
 

Anonymous
By Anonymous - On 12/24/2009 5:34:28 PM
its very greatful and helpful for me plese send me extra detail in my mail id
 

Anonymous
By Anonymous - On 7/18/2009 12:02:12 PM
very helpful for new job seekers.try to give more information like what is meant be tension , compression and where they will occur in a beam,slab etc..
 

sharmishtha
By sharmishtha -  On  6/8/2009 11:09:43 AM
In stair slab use 12 mm MS steel bar .
 

Pujesh Mallick
By Pujesh Mallick -  On  6/5/2009 11:31:18 PM

what should be the size of steel bar in stair slab.
 

Anonymous
By Anonymous - On 2/9/2009 1:24:24 AM
We are looking for supply of Y12 steel bars. Please quote us 25, 000 mt. CNF Mombasa.

Regards,
John Mangeli
 

Anonymous
By Anonymous - On 2/8/2009 12:49:08 AM
Dear Sir,
I am purchasing house in 13 storey new house which is in foundation stage.please give me the following details.Steel bars size required,foundation depth,cement req.for foundation and how much curing required for foundation pillars if they r using 53 grade cement
 

anilkishor
By anilkishor -  On  8/17/2008 11:25:34 AM
it is very helpfull in acquiring knowledge and gain the practical experience
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Guidelines for Laying Cement Concrete Floor
Guidelines for Laying Cement Concrete Fl...



 
Tue Sep 01, 2015Post  #2
JAI PRAKASH
JAI PRAKASH

Join date: May 2014
80 cm gap is too high.

 
Wed Sep 02, 2015Post  #3
bala
bala

Join date: Jul 2014
Dear jai sir,

I could not understand the term gap...

80 cm is vertical length of 2 steel bars each which is going to be over lapped 

 
Wed Sep 02, 2015Post  #4
bala
bala

Join date: Jul 2014
Dear S L Gupta sir,

Thanks for your response 

If the height of the open steel which is to be over lapped is less than 80 cm ( for example we say approx. 50,55,65,60 cm each ( 4 nos ))

How to proceed sir ? How to reinforce this area ? 

Thanks 

 
Wed Sep 02, 2015Post  #5
JAI PRAKASH
JAI PRAKASH

Join date: May 2014

Clear cover to main reinforcement in
Footings : 50 mm
Raft foundation Top : 50 mm
Raft foundation Bottom/ sides : 75 mm
Strap Beam : 50 mm
Grade Slab : 20 mm
Column : 40 mm (d>12mm) 25 mm (d= 12mm)
Shear Wall : 25 mm
Beams : 25 mm
Slabs : 15 mm or not less than diameter of the bar.
Flat Slab : 20 mm
Staircase : 15 mm
Retaining Wall on Earth : 20/ 25 mm
Water retaining structures : 20 / 30 mm
Sunshade (Chajja) : 25 mm

Hook for stirrups is 9D for one side

No. of stirrups = (clear span/Spanning) + 1

For Cantilever anchorage length for main steel is 69D

“L” for column main rod in footing is minimum of 300mm

Chairs of minimum 12 mm diameter bars should be used.

Minimum diameter of dowel bars should be 12 mm

Lap slices should not be used for bar larger than 36 mm.

In steel reinforcement binding wire required is 8 kg per MT.

Lapping is not allowed for the bars having diameters more than 36 mm.

Minimum number of bars for a square column are 4 and for circular column are 6.

Longitudinal reinforcement should not be less than 0.8% and more than 6% of gross C/S.

Weight of rod per meter length = d2/162 where d is the diameter in mm

All reinforcement shall be free from mill scales, loose rust & coats of paints, oil or any other substances.

Main bars in the slabs shall not be less than 8 mm (HYSD) or 10 mm (Plain bars) and the distributors not less than 8 mm and not more than 1/8 of slab thickness.

In case of spacing of bars
Provide the diameter of the bar, if the diameter of the bar are equal.
Provide the diameter of the larger bar, if the diameter are unequal.
5mm more than the nominal maximum size of the coarse aggregate.

 

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