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Tunnel & Foundation Drilling Solution

Probe drilling, pipe-roof holes and anchor cable holes in confined spaces, needing compact equipment and accurate holes.

Scope of work

Tight faces (6–12 m tunnel section) limit equipment size and rod length
Probe holes are usually upward or near-horizontal, making cuttings removal hard
Collapsing ground needs casing-while-drilling, which puts a premium on coupling and shank accuracy

Selected by hole size and duty — not the whole range

Φ82mm · hole Φ90-115mm · 23kg

For small probe holes — Φ82 mm OD for Φ90–115 mm, short body for tight spaces

Φ99mm · hole Φ110-135mm · 42.7kg

Workhorse for pipe-roof and anchor holes — Φ99 mm OD for Φ110–135 mm, with short rods for staged work

Φ82mm · hole Φ90-115mm · 24.2kg

Economical for hard rock — Φ82 mm OD for Φ90–115 mm, can be mixed with top hammer tools

For upward holes, increase flushing air and pull back periodically to stop cuttings falling and jamming

Use casing-while-drilling in collapsing ground, keeping 10–15 mm clearance to the bit

Couplings and shanks made to R32 / T38 to match the rock drill on site