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The analysis showed that the pull force was three times less for a ballasted pipe, which increased the factor of safety by more than two-fold. As such, the HDD pulling force was calculated for both empty and filled pipe.
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One of the critical considerations during this analysis was the need for ballasting the pipe during installation. Based on the bore geometry of 10-degree entry angle, 5-degree exit angle, and 40-ft maximum depth, calculations were performed for the HDD pulling force. and manufacturer of fusible PVC pipe, aided LAN in the pipe stress analysis and fusion services on the 30-in. Underground Solutions, a subsidiary of Aegion Corp. Considering the diameter, length, depth and bending radius requirements, we felt Fusible PVC pipe was the best option.” in internal diameter, as well as the flexibility that we wanted. “Fusible PVC pipe gave us an additional 3 in. “We considered HDPE but it has a much thicker wall, which would reduce the internal diameter, and in turn, the flow capacity,” said Serres. After evaluating a number of pipe materials, the team chose fusible PVC pipe. Chief among them was the pipe material needed for the HDD crossing. RELATED: Robotic Technologies Used as a Condition Assessment Toolĭue to the complexity of the HDD crossing, the design team had to take into account several critical issues. “The size of the identified wetlands area exceeded the typical length for conventional trenchless installation methods such as augering and microtunneling, which would have required multiple intermediate pits within a crossing of this length,” said Shelley Serres, P.E, LAN senior associate and senior project manager. Fused Industries subcontracted TCH Directional Drilling, which specializes in HDD. Army Corps of Engineers requirements, the project team designed the crossing to be installed using horizontal directional drilling (HDD). For approximately 2,160 lf, the proposed water main crossed Cypress Creek and a surrounding area of protected wetlands. Fused Industries (previously known as Meiners Construction Inc.) served as the general contractor.
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(LAN), as the engineer-of-record to implement Contract 34 successfully. In January 2014, WHCRWA hired Lockwood, Andrews & Newnam Inc. Fusible PVC pipe string being joined by the butt fusion process.