EIGHT HUNDRED & NINETY-FIVE FEET
by Tommy Marciniak, Corporate Marketing Manager, Trinity Shoring Products, Inc. E
ight hundred and ninety-five feet. That was the dis- tance Chicago-based contractor James McHugh Construction Company had to install 84” rein- forced concrete pipe (RCP) as part of the WB
I-290 Flyover Project. McHugh subcontracted Dynamicx Enterprises (Chicago) to install the shoring, and tunneling contractor LJ Keefe Company (Mt. Prospect, Ill.) to do the pipe jacking/tunneling. Keefe planned to use a 102” diameter tunnel boring machine (TBM). This is simple enough on the surface, but below the surface is where things get interesting.
In order to do the tunneling, LJ Keefe required a jacking pit with an inside dimension of 20’ wide x 40’ long x 32’ deep. They needed 24’ clear (minimum) in the front bay of the pit to bring in pipe and remove soil. The tunneling also required a thrust block 12’ high x 22’ wide x 8’ thick. The receiving pit had an inside dimension of 21’ ¼” wide x 29’ 4 ¼” long x 25’ deep.
“For a project like this, normally we would quote a slide rail system,” noted Bill Stanley, Sales Representative for Lee Jensen Sales, out of Crystal Lake and New Lenox, Ill.
We were within 5’ of active traffic on Westbound I-290 for both the receiving and jacking pits, as well as having a build- ing 65’ from the receiving pit; we had to come up with some- thing else. As we started digging into the parameters of the project, it was about as challenging as you’d see for an earth retention system: tight work spaces, deep cuts, poor soils, heavy surcharge loads and large clearances—horizontal and vertical—required.”
That nearby building proved to be a big area of concern for the whole project. Officials were concerned about building set- tlement, roadway and bridge support, as well as many active utilities in the area. As such, they put into place the require- ment that any shoring used could deflect no more than 1”.
“When Lee Jensen Sales contacted us about the project, my first thought was it could be done using Slide Rail,” mentioned Joshua Thorne, Pro-Tec Equipment’s Shoring Manager, “but when the talk of no more than 1” deflection came up, I knew that could only be done by one thing: sheeting. For Pro-Tec Equipment, that meant the Pro-Brace.”
View of the tunneling pit for the WB I-290 Flyover project.
The project’s jacking or tunneling pit had an inside dimension of 20’ wide x 40’ long x 32’ deep.
46 THE WHO’S WHO IN BUILDING & CONSTRUCTION SPONSORED CONTENT
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