Gouda Geo-Equipment B.V.
2181 MH Hillegom
2181 MH Hillegom
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Lost Tip Drilling Method (Hammer)When soil sampling and profile description is not required, the drilling procedure can be executed fast and efficiently by applying the lost tip drilling method.
The lost tip is hammered into the ground using a Wacker gasoline motor hammer, which is placed on top of the casing tubes.
The lost tip assures a very straight bore hole that is slightly larger in diameter than the casing in order to reduce lateral friction on the string of tubes. This makes it possible to reach greater depths.
On reaching the desired depth a filter tube / piezometer standpipe can be lowered through the string of casing tubes. Subsequently the string of casing tubes can be retracted using the 2-person operated rod puller in combination with wedge type pulling clamp.
The lost tip drilling method is successfully applied to place small diameter monitoring well pipes for environmental research. The lost tip remains in the soil when the string of casing tubes is retracted. This does not cause any environmental issues as the lost tip is manufactured of cast iron.
The complete set comprises the following items:
- Gasoline motor hammer Wacker BH23
- Insert hammer head for Wacker BH23 / EH23 hammers, M22 connection
- Cross-over from hammer head to casing tubes with APB rope thread
- Set of 10 CPT casing tubes with APB rope thread (55/39 x 1000 mm)
- Holder for lost tip with APB rope thread (55/42 x 150 mm)
- Set of 20 lost tips
- 60 kN two bar manual puller (incl. bars) for tubes up to 85 mm
- Steel reinforced plywood support plate
- Pulling bowl 100 mm with 2 handles
- Set of hardened jaws for tubes with an outer diameter ranging from 50 to 56 mm
- Set of 2 pipe wrenches "Gedore" (L = 580 mm)
- Robust aluminium steps with 4 extra wide treads provided with rubber anti-slip profile