Please see below the concern from one of our districts. Could you please provide the vertical taper rate recommendation that temporary concrete barriers can be install on?
Based on the information provided below, they want to do all the resurfacing (approach and roadway) at the end of the project. To do that, they have to install a temporary ramp (due to the differential height of 1.75”) between the existing approach pavement and the bridge joint area (which will be completed first that the approach and roadway), and then install the PCB on this temporary ramp. The question they have, is there any recommended ramp slope or ramp vertical rates to install the PCB on it, in which the barriers connections (pin and loop), and any other part of the barrier will perform well if those get hit?
Each PCB section length is 12.5’, as an example, if they would install a PCB section on the proposed ramp that will have a drop off of 1.75”, the taper rate would be 86:1.
Any comments/suggestions are welcome.
_________________________________________________________________________________________________________________Can temporary concrete barrier wall be set up over a change in pavement elevation? Say there’s a difference of 1.75” between a bridge joint and an existing approach pavement?
In the below instance the bridge repair work is done and the concrete overlay is done, but the proposed HMA Surface isn’t. I’d like to do all the resurfacing at the end of the project when the barrier wall is gone.
In terms of placing the PCBs on a ramp, we don’t have any real data to provide guidance with. Potential issues would include:
Thus, there are some drawbacks that one can foresee in this type of installation. The first two might be acceptable if the connection between segments can be made. The third case should be avoided.