Hellow friends
Want to know lapping done correctly
My first project
Thanx
Want to know lapping done correctly
My first project
Thanx
Is the lapping of bar done correctly?
- Thread starter Surya Singham
- Start date
Srinivasan
Prime CE
this is not the right way of lapping.lapping to b segregated so that no obstruction while pouring concrete.regarding methodology of lapping refer my post of how to fix the reinforcement in this site itself
Pawan Dhagate
Staff member
All bar should not be lapped at single level, they should be staggered.
At same level we should not lap more than 50% of bars
At same level we should not lap more than 50% of bars
Harikiran N
Junior Member
Lapping should be staggered by maintaining distance between alternate is 1.2times the development length
Srinivasan
Prime CE
Srinivasan
Prime CE
<Deleted your post>
Do not post about personal help done by members, We understand your problem and will try to help you out by going beyond.
Do not post about personal help done by members, We understand your problem and will try to help you out by going beyond.
Last edited by a moderator:
Dnyan Deshmukh
Staff member
Lapping in the vertical reinforcement should be staggered and it should be never lap at single level and not at center of the free height too.
At any level not more than 50% number of bars should be lapped.
staggering of rebar can be done as stated below
find the center of free height of column
say column height from slab top to beam bottom is 3 meter.
You should lap the 50 % bar below 1.5 meter height
50% bar above the 1.5 meter height.
If no one is ready to listen you then write to your structural consultant with photo of it, in case structural engineer visited the site and said OK for it (In general structural consultant who visits the site, do not have actual knowledge of it and they were just a trainee who joined a structural consultant to get experience and start their own agency)
At any level not more than 50% number of bars should be lapped.
staggering of rebar can be done as stated below
find the center of free height of column
say column height from slab top to beam bottom is 3 meter.
You should lap the 50 % bar below 1.5 meter height
50% bar above the 1.5 meter height.
If no one is ready to listen you then write to your structural consultant with photo of it, in case structural engineer visited the site and said OK for it (In general structural consultant who visits the site, do not have actual knowledge of it and they were just a trainee who joined a structural consultant to get experience and start their own agency)
- As per IS:13920-1993, the lap length be provided ONLY in the middle half of column and not near its top or bottom ends (Ref attached Figure).
- Also, only half the vertical bars in the column are to be lapped at a time in any storey.
- Further, when laps are provided, ties must be provided along the length of the lap at a spacing not more than 150mm or as specified by consultant.
Sivasankar Reddy
Newbie
Lap joint was done good but it seems all the bars are jointed at one location, if yes, then it is wrong, because 50% is max to lap at one location.
lnbiswas1941
Newbie
1.lapp should be staggered
2.both bars should be co axial during lapping.
3.c/c dist of staggered lap should be 1.2 or 1.5 times of lap length nit less than that
