repair of foundation
repair of foundation
(OP)
hi
i have isolated footing with depth 1.2 meter casted already in the site but we need to add new column is very near to the edge of it has heavy load
we need to change this footing to be combind footing to be suitable with the new sutiation.
the steps of repair as below:
1- rough the surface of old footing from all side.
2- we drill in old footing for the bottom bar for 30 cm deep then we fill the hole with epoxy material.
3-we put the steel bar for the new footing in that hole.
4-we cast the new footing with 20 cm concrete above the old footing with new steel layer at the top the total depth became 1.4 meter for the combind footing.
what do you think of that concept of repair?
is that right way or not?
i have isolated footing with depth 1.2 meter casted already in the site but we need to add new column is very near to the edge of it has heavy load
we need to change this footing to be combind footing to be suitable with the new sutiation.
the steps of repair as below:
1- rough the surface of old footing from all side.
2- we drill in old footing for the bottom bar for 30 cm deep then we fill the hole with epoxy material.
3-we put the steel bar for the new footing in that hole.
4-we cast the new footing with 20 cm concrete above the old footing with new steel layer at the top the total depth became 1.4 meter for the combind footing.
what do you think of that concept of repair?
is that right way or not?






RE: repair of foundation
Your procedure is ok, though I suggest you also apply concrete bonding agent to old footing surface right before pouring new concrete. This is to bind old concrete with new concrete and act as one.
RE: repair of foundation
By the way, swelm, you never did report back on how you got 23 kg/cm^2 bearing pressure on the core of a 58 metre tall building. Unless you give feedback when requested, you will lose enthusiasm for your questions.
RE: repair of foundation
is that critical?
for eng'r hokie66 your way is very hard to implement in site
and for the raft stress you will find my answer in thread
thanks for your action
RE: repair of foundation
RE: repair of foundation
Clefcon
RE: repair of foundation
RE: repair of foundation
RE: repair of foundation
RE: repair of foundation
Not sure I understand what you are getting at, but swelm's problem is that he has a column load (axial load) close to the edge of a footing, and to carry the load he needs to enlarge the existing footing, thus creating a footing which carries two columns (two axial loads). In so doing, he has to deal with the shear and bending which this introduces. This would be simple if the footing were monolithic, but he is trying to tie two big lumps of concrete together. Thus his question and the various opinions he has received in answer.
RE: repair of foundation
what iam suggesting or asking is making a steel bar connection between two footings will only transfer (share) local bending moment between the two footings, but "two big lumps of concrete might come together"