Forepoling, also known as tube umbrella, is an application used to strengthen tunnel roof in broken rock conditions. Drilling system consists of casing tubes which are drilled through the overburden as an umbrella and filled with grouting.
KAT Casing System allows easy driving of the casing tubes into the ground with low torque demand. In modern forepoling also fibreglass casings can be used for ultra-long facebolts.
KAT Casing Systems mostly used in forepoling are RoX+ 88,9/8, RoX 114,3/10 and RoX 139,7/10.
Casing tubes
Typically one pile consist of several steel casings of 1,5 – 3 meters
Connection by thread
Injection valves for grouting
Standard casing diameters: 88,9 - 114,3 - 139,7 - 168,3 mm .
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