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A select variety of heaps are lots examined to show the engineering load style. Duplex drill casing via the overburden dirt to the top of rock. This page focuses on the Geotec Micropile systems, which is based on high-performance completely threaded steel bars. Sonitec system have been made for the sole function of facilitating the setting up as well as installment of lengthy tube lengths in support cages. CSL technique requires a transmitter as well as a receiver to be put in identical water-filled tube down the stack depth in order to circulate and gauge the flynn piling north west speed of ultrasonic pulses.