Core drill/insert spacing

[EEJaime]

Hello all, that includes you Casseopeia,

I will ask the structural on this project this question, but thought it would be good to get this forum's input.

I have a situation where I will be penetrating a poured in place basement wall with a large quantity of conduit. These will mostly be 4" conduit, but I also have some 6" conduit and a few smaller ones. In one location for instance I have 16-6" conduit entering a basement from an on-site manhole. I intend to penetrate the wall either with core-drilled holes or by using a cast-in-place pvc insert. The 6" rigid steel conduit requires a 10" opening to allow the installatio of the link-seal assembly. I have given a sketch to the structural engineer indicting these penetrations in a 2 wide x 8 high configuration. So he will frame out a 10'-6" h x 2'-6" wide 'window' without rebar for the penetrations if I core drill, or we will cast the inserts in place.

OK, my question is this. I have indicated a 6" space horizontally and vertically between each 10" penetration. I assumed that this would be sufficient to allow working space to tighten the link-seals and prevent spauling of the openings if cored. What would your recommended minimum spacing between core-drilled openings be? Would that change if we used cast in place inserts?

Thank you for your patience, regards,

EEJaime

 

[JAE]

I would first see what the general spacing of the reinforcing is in the vertical and horizontal direction and try to accommodate that such that you would have a bar between each opening.

 

[ishvaaag]

In any case for most basement walls/mats at these hole sizes no particular problem should develop; how less if acting with care and attention to detail. So continue in consultation with the director of the structural works and go ahead.