Installation of piping, cabling, and ductwork for gravity and pressure network applications.
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Guided Auger Boring is a precision-driven process distinct from traditional Auger Boring, designed for accurate installation along predetermined lines and levels, ideal for gravity-dependent systems like sewers. The operation starts with the establishment of launch and reception shafts that accommodate the boring machine. Equipped with a jacking frame and usually a thrust backing, the machine is positioned in the launch shaft and aligned with the intended route.
A laser-based optical guidance system is set to ensure the bore follows the correct line and level. The boring process involves an initial pilot bore, guided by directional drilling techniques similar to those used in Horizontal Directional Drilling (HDD). The pilot bore guides the subsequent installation phases, with a cutting head auger following to excavate the bore to its final diameter. Spoil from the drilling is conveyed back to the launch shaft for removal. Once the bore reaches the required diameter, the casing or product pipe is pushed into place, and the installation machinery and casing are then retrieved from the reception shaft.
Like other jacked pipe systems, this method minimizes environmental and economic impact, causing little disruption to local communities. The compact machinery used does not produce slurry, making it cleaner to operate. Typically, clay or concrete pipes are installed using this method. This technique is not only rapid and efficient but also generally less costly than the more complex Microtunnelling systems, and it requires a significantly smaller operational area. The method ensures the ground surrounding the bore is fully supported throughout the installation process.
This method is suitable for installing gas, water, cable, and sewer systems ranging in diameter from 90 mm (3½ inches) to over 1,000 mm (40 inches) and up to 100 meters in length, depending on the soil type. It is primarily used in softer soils, though with the appropriate boring heads, it can also tackle harder soils and soft rock. It should be noted that the accuracy of this steered boring system is approximately ±25 mm over a 50-meter length, so installations requiring greater precision might need a more accurate technique such as Microtunnelling.
Building on the standard installation sequence, recent innovations from equipment manufacturers include the development of a powered cutter head for the second phase of drilling. This enhancement allows for boring in harder materials and larger diameters. With its own dedicated power supply, this cutter head can tackle conditions that were once only manageable by Microtunnelling methods, thus broadening the application scope of Guided Auger Boring systems.
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