Directional Bore, Stormwater Treatment Technologies Solve Problems At Florida Lagoon

By W. Keith McCully, P.E. | June 2009 Vol. 64 No. 6

Before the Stormwater Park could begin treating the water, a pump station was constructed along one of the nearby large canals. Officials and engineers determined that the best way to get the polluted water to the Stormwater Park was via a 700-foot pipeline installed using directional bore methods. The bore was made trickier by some of the plan’s specifications – to go at least 10 feet beneath the beds of two of the canals, as well as traveling under a road that will likely be widened in the future.

High-density polyethylene pipe (HDPE) was chosen for the project due to some of the design demands placed on the proposed pipeline. First, a gradual curve in the pipe was required so the pipeline would reach the Stormwater Park at the desired location. HDPE’s properties allow it to flex, yet remain structurally strong. Secondly, the pipe will have to stand up to the chemicals in the polluted water.

Personnel from Arrow Directional Boring Inc. fused the 24-inch DIPS SDR 11 JM Eagle polyethylene pipe with a McElroy Rolling 1236 machine from ISCO Industries along a narrow right-of-way between a fence line and one of the canals. A mechanical joint adapter was fused onto the HDPE pipe, allowing the pipe to be joined to a ductile iron force main connected to the pump station situated along the canal. Workers then continued fusing the pipe until 700 feet was completed along the narrow right-of-way. The pipe fusion process took only two days.

Arrow Directional Boring performed the pipe fusions, as well as the directional drilling on the project. The bore and subsequent pulling of the line through the hole was performed by a 261-horsepower Ditch Witch JT7020 HDD system. Arrow Directional Boring’s team performed the bore and pull-in over a five day period. On the first day, the team set up the rig and recycling equipment. That was followed by a day of surveying for the wire line guidance system. The third day was spent completing the pilot bore and starting the reaming process for the 24-inch pipe. The pipe was hooked into place on the fourth day, with the pipe being filled with water to give it neutral buoyancy. The final day was spent pulling the pipe into place, which was completed by dusk.

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