pipe installation

[par060]

We have a tunnel a little over 12’ in diameter in which 2 60” force mains are going to be run. The tunnel will be about 4000’ long. I believe the pipe is going to be rfp or possibly hdpe. I have little experience in this but I have to come up with some installation options to put on our bid drawings. I have been hearing about 2 methods that are probably going to be used….either sliding or carrying the pipe. The tunnel is fairly straight a slight vertical curve will be present. As of now the tunnel is about 40’ deep with 30’ shafts. Can someone give me a rundown of the 2 installation methods….if the sliding method is used do they just fill the invert and push the pipe along the concrete?….if the pipe is carried in there will not be a lot of room for the second pipe to be worked on…how will the connection be made?…….what kind of problem will I have grouting in the pipe after installation….is the grouting needed?

Any infomation on the pipe or installation would be helpful…thanks

 

[dicksewerrat]

what is the existing tunnel made out of? Is this a round tunnel? Are there areas behind the access points to dig a sloping ditch down to the tunnel elevation? If sliding or pulling in long segments of pipe, you need to support the line with rollers. the second pipe will be above and to one side of the first.