![]() ![]() Should the need to construct through gravelly soils be required, assessing the feasibility of the trenchless technology and mitigation strategies available to manage the risk impacts is necessary to minimize or prevent cost overruns, schedule delays, environmental and social impacts. The geotechnical investigation and delineation of the subsurface including gravels is a necessary input into the design process and construction planning and execution of the HDD. ![]() With mapping technology, you can mark utilities, plan bores in real-time and export reports to better collaborate and save time before, during and after a job.Īllouche and Murray:Bore instability and loss of drilling fluids continue to be primary concerns with HDD owing to the presence of an uncased open hole during the drilling, reaming and pull-in operations in gravelly materials. Other applications that are web-based have been developed for contractors to capture and manage electronic jobsite documentation in one place to easily share with others. ![]() What are the most valuable “lessons learned” with regard to the design and construction of HDD projects? What are some areas of future improvements/enhancements?ĭalgleish: Bore design is critical and that’s why software applications have been developed to take the user through the design and planning process of an HDD bore in a sequential manner. RELATED: Trenchless Technology Canada Roundtable: The State of Trenchless Technology in CanadaĢ. To provide air to the hammer’s compressor, manufacturers have units that provide higher CFM and PSI in a small footprint that are also more fuel efficient and operate at lower decibels. Air hammers and hammer reamers cycle at high frequency – high frequency means smaller cuttings that are easily transported out of the borehole. These further extend the ability of the HDD industry to tackle complex subsurface conditions.ĭalgleish: Rock bores are becoming more common and equipment has evolved to meet the challenge, dual rod or rod-in-rod drill rigs use the inner rod to turn the rock bit on a bent sub rock head. Other improvements include improvements in drilling fluid chemistry, to better handle the loss of circulation and stability issues in coarse granular formations, and incorporation of ground improvement techniques into HDD designs. Recent advancement in reamer technology enables pushing reamer diameter beyond the 60-in. Development of hybrid techniques will continue to overcome the challenges related to HDD, such as the methods which combine the advantages of HDD and microtunneling to create unique trenchless alternatives. We have found that owner and designer education still remains a “gap,” and informing these stakeholders of the capabilities, risks and application of the technology will play a critical role over the next few years in order to continue to expand into new markets.Īllouche and Murray: Continuous improvements related to wireless technology will be integrated into HDD projects, such as directional guidance and annular pressure monitoring. We are seeing the opportunity to use the technology in several new industries that were perhaps a bit hesitant a few years ago. We anticipate a significant increase in urban community application where stakeholders need to cross obstacles and wish to reduce the impacts of construction on their communities. Vos: We see the HDD industry continuing to develop and expand. Where do you see the HDD market heading in the next five to 10 years (new markets, existing gaps in HDD capabilities)? ![]()
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