grout hole requiremen

huangyhg

grout hole requirement
we generally provide 14mmØ grout hole in a base plate when the base plate size gets bigger than 300mm.  to my understanding, this comes from accepted industry practice.  i am wondering, if there is any published document where i can find the proper recommendation on grout hole size and the number of grout holes as a function of base plate size?
thank you all in advance for your kind assistance.
regards
am

on four-hole base plates, which cover most ubs and ucs, i've usually just seen just two holes, one each side of the column web.
  +        +
     o   o
  +        +
(where "+" is a bolt hole and "o" is a grout egress hole)
on "longer" baseplates, say for wb's, i've seen grout holes located between bolts on both side of the column web.
  +        +
     o   o
  +        +
     o   o
  +        +
     o   o
  +        +
dbuzz
thank you very much for your input.  we do exactly the same thing as you explained.  i am looking for any technical reference to justify this approach.
regards
am
because you're using mm, i assume you're somewhere besides the usa.
300 mm = 11.8-in., which is a very small base plate. everybody i know starts to use a grout hole for base plates above 24-in., or about 600 mm.
according to the aisc manual, there's only need for one grout hole.
dbd
i don't know of any references that address this.  it's more of a construction issue, ensuring that the grout spreads underneath the base plate.
dbdavis, where i work it's usual practice to include grout egress holes once the base plate width exceeds 300mm.
thank you all for your responses.  it is interesting to know about the practice in the usa also.  we will stick with the running practice of 300mm then.
i'm in the us and i can tell you that i've probably designed a 4-digit number of base plates on jobs between 18" (450mm) and 22" (560mm) square without grout holes. as far as i know that's typical in the us. i've worked for three different firms that used 24" (610mm) as the cutoff for inclusion of grout holes.
the 300 mm (12") limit seems ridiculous to me. are you sure you've not misunderstood that or been told wrong?
what do you do if you have an 8" (200mm) square tube column? you'd have a base plate larger than 300 mm under that to have any chance at anchor rod clearance. do you put a grout hole in the middle of the tube and make sure that there's a hole somewhere for air to vent?
for that matter, i've never even seen a base plate smaller than 12" (300mm) except for very small posts in mechanical frames and steel stairs. we even use a 12" (300mm) base plate under 4" (100mm) tube columns which is about the smallest tube column i've ever used except for about twice when i had to use 3" to cram it into a stud wall.
i'll be anxious to know what others use.
dbd
dbd
thank you for your comments.  personally i do not have any satisfactory input in this subject.  i will run this discussion with my other industry colleagues/peers and will update on this subject if i get any feedback.
regards
my big question is: how do you ever have base plates smaller than 300 mm?
please let us know the results your discussions with your industry colleagues. it is interesting to know the opinions of others.
have a good day (or not in this case, i suppose).
dbd
there's more than one way to skin a cat dbd.
my answer to your "big question":
the standards for my company (a world-wide engineering and project services group) and several clients (including some of the world's major resource companies) have the following australian sections where the base plate width does not exceed 300mm:
- 150ub, 180ub, 200ub, 250ub, 310ub, 360ub, 410ub, 460ub, 530ub, 610ub
- 100uc, 250uc
- 100pfc, 125pfc, 150pfc, 180pfc, 200pfc, 230pfc, 250pfc
- 65shs, 75shs, 89shs, 100shs, 125shs
- 76chs, 89chs, 102chs, 114chs, 140chs
- 65ea, 75ea, 90ea, 100ea, 125ea, 150ea, 200ea