Construction Joints in Conc Pedestrian Tunnel
Construction Joints in Conc Pedestrian Tunnel
(OP)
I'm working on a reinforced concrete pedestrian/service tunnel located under a street to connect the basements of two exisitng buildings. The tunnel is 350 long, 15' wide, 15' tall. The floor of the tunnel is 18" thick, T & B reinforcement, primary load is hydrostatic uplift, as the tunnel is below the water table.
I would appreciate input on recommendations for construction joint spacing and control joint details in the tunnel floor. Floor is subjected to wheel loads from forklifts.
Thanks.
I would appreciate input on recommendations for construction joint spacing and control joint details in the tunnel floor. Floor is subjected to wheel loads from forklifts.
Thanks.






RE: Construction Joints in Conc Pedestrian Tunnel
RE: Construction Joints in Conc Pedestrian Tunnel
I have currently proposed 40' o.c. construction joints, installed everyother. Contractor has proposed saw cuts 1" deep at every 20' caulked.
Thank you for your input.
RE: Construction Joints in Conc Pedestrian Tunnel
In 350 feet, will you have an expansion joint (which will really work to absorb shrinkage)?
RE: Construction Joints in Conc Pedestrian Tunnel
Dik
RE: Construction Joints in Conc Pedestrian Tunnel
RE: Construction Joints in Conc Pedestrian Tunnel
RE: Construction Joints in Conc Pedestrian Tunnel
If the sections are small enough, you might have the contractor entertain geting a price for precast. This works well if you have to close off part of a busy road and need to get it done in quickly.
RE: Construction Joints in Conc Pedestrian Tunnel
RE: Construction Joints in Conc Pedestrian Tunnel
RE: Construction Joints in Conc Pedestrian Tunnel
RE: Construction Joints in Conc Pedestrian Tunnel
To address some of the responses:
Precast was considered and ruled out due to length of time to permit + fabricate (this municipality requires precast shop drawings submitted at permit time.) R/C was faster + cheaper.
Contractor suggested the 40' construction joint alternate pours in the floor - no cost impact from one continuous pour. Each joint will have a waterstop.
We have used small bars, tight spacing in the entire tunnel.
Exterior Waterproofing details are by the Architect and no expense is being spared. But since WP can fail or get punctured during construction, all joints have waterstops.
I am somewhat concerned about the performance of saw cut joints with the wheel loads.
RE: Construction Joints in Conc Pedestrian Tunnel
RE: Construction Joints in Conc Pedestrian Tunnel
RE: Construction Joints in Conc Pedestrian Tunnel
RE: Construction Joints in Conc Pedestrian Tunnel
RE: Construction Joints in Conc Pedestrian Tunnel
RE: Construction Joints in Conc Pedestrian Tunnel
Yes....agree.