Follow-up Casing

Follow-up casing drilling tool with the aid of DTH hammer, eccentric underreaming bit and follow-up casing is used to effectively drill holes in complicated formation such as loose ground, crash layer and gravel etc. These holes often need protecting hole wall.This drilling tool is applied to complete high pressure jet grouting holes, cement grouting holes, anchor wire holes, drainage holes, blast hole, underwater blast hole, trenchless guided drilling hole for underground pipe line and cable installation.This item won National patent Chinese patent number: ZL022581561Specifications Casing size DTH hammer type Enlarging hole diameter Inner diameter of casing shoe 89 QCW-70 92 69 108 QCW-80 111 86 127 QCW-80 132 102 140 QCW-100 145 112 146 QCW-100 152 120 168 QCW-130 175 138 178 QCW-130 185 147 194 QCW-150 211 165 245 QCW-150 254 205 273 QCW-170 286 230