huangyhg

vertical construction joints @ 4-way wall corners.
hi i have a water tank partitioned into many smaller square cells like a checkerboard. i have seen t-shaped wall corner forms but what about cross-shaped? i have never seen those before. is it too hard to do.
the cells needs to be water tight such that water cannot get from one cell to the next and therefore require ribbed pvc waterstops in them.
anybody have suggestions on where to place these vertical construction joints?

my first thought would be to form & pour the corner "cross" monolithically, then put the pvc waterstop in each of the four vertical joints. each of the wall sections of the "cross" would be a full form width away. it makes bulkheading the end of the walls easiser.
if the process requires watertight cross walls, design them and let the contractor worry about forming them. he might have to build some custom formwork. but they're clever about these things and will figure it out.
as far as the spacing, i don't know how big your structure is, but 15 ft. from a corner is a good number. pour the cross sections last.
you might want to construct the checkerboard by joining together a bunch of '+' with the waterstop middle face of the tank walls.
i'd likely use a large bulbed pvc waterstop that fits on the form, not in the middle of the wall... had too much problem with these collapsing. you might also include a vulclay type of joint in the middle and terminate half the reinforcing or use proper dowels.
dik
bulbed pvc waterstop that fits on the form? what do you mean. do you mean place the waterstop flat against the form instead of at the middle of the wall cross section? that is possible?
if the walls are partitioned like a checkerboard, what about constructing the walls with volclay panels in between, as sandwiched between two concrete walls?
mike mccann
mccann engineering
yahoo,
yes, the type dik is talking about just sits flat on the form. if the forms are wood, you nail them on. some people call them "rearguard" waterstops, but in your case you should use them each side.
do you mean split flanged waterstops? the problem with these is that you can't splice it with perpendicular waterstops.
if all your waterstops are vertical, where would the perpendicular joints be? do you mean at the slab to wall joint at the bottom?

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