![]() ![]() ![]() “City officials were willing to try this alternate installation technique and save costs with HDD. This installation was the first of its kind in the area,” Simon added. “While microtunneling does have some directional capabilities, HDD offers much greater directional control, and eliminated the need for large, deep entry and exit pits.” The HDD rig is set up on the surface and can directionally tunnel not only horizontally, but also vertically to reach the required underground depth. “Microtunneling is widely used in South Florida for this type of project,” he continued. “Installing 3,000 feet of 54-inch pipe and having to open a 6-foot diameter hole was enough of a challenge. “A curve of this magnitude would have highly increased the level of difficulty,” Simon explained. Simon said two shots were made because of the radius of curvature in the running line of the project. Both were made with a 1-million-pound pullback Vermeer D1000x900 drill rig. The installation was made with two HDD shots: the first 3,000 feet, the second 1,300 feet. Spartan Owner/Supervisor Barry Nailing, was in charge of HDD operations. Spartan subcontracted installation of the 4,300-foot section from Hardrock Directional Drilling. The project owner was the Miami Beach Public Works Department and the primary contractor was David Mancini & Sons (DMSI). It is believed to be the longest installation by horizontal directional drilling (HDD) of HDPE pipe in a diameter this large, said Boyd Simon, P.E., Spartan manager. The segment will provide an alternate backup sewer release for South Beach. A project that involved installing 4,300 feet of 54-inch diameter HDPE pipe in the busy South Beach area of Miami Beach, FL, recently was completed by Spartan Directional LLC.
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