Shield method tunneling refers to the trenchless technique by where a shield is used to cut through the earth to create a bore while providing safe cover during the excavation of soil and the advance of casings behind the shield. The shield serves as a barrier that prevents soil collapse on personnel or equipment involved in excavation.
Shield's are used in pipe jacking operations where the shield is launched from the launch shaft. A thrust ring connected to the shield ensures that the thrust force from the hydraulic jacks is evenly distributed around its circumference. Some shields are steerable, allowing the route of the bore to be adjusted as it progresses. Once the shield emerges from the receiving pit, it is removed and the construction process is complete. Closed shields provide lateral and frontal support while open shields only provide lateral support.
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