Artesian Wells

Artesian wells have been one of the specialities of the Bertella company for many years.

Method of execution

a. drilling: drilling is carried out by rotation or rotary percussion in the Ø of 180/350 mm, with a drilling machine fitted with a triple blade cutter, hammer or triple cone, using male/female drill pipes to reach the required depth and temporary steel casing or bentonite mud in the case of loose and poorly composed ground.
b. laying the water-drawing pipes: next the non-toxic PVC pipes are inserted or screw-jointed steel ones suitably perforated with microscopic holes at water table level, down to the bottom of the bore hole paying attention not to cause small earth slips within the bore hole that could influence the outcome of this stage.
c. laying draining material: at the end of the second stage, the space between the PVC pipe and the bore hole is filled with fine washed gravel in order to keep the well's acting surface at a maximum and prevent slippage of the surrounding ground which could carry earth material into the well causing it to block; at this point the temporary lining or bentonite mud is recovered and the well is discharged, that is to say it is cleaned of any debris that could have entered through the PVC pipe or which has collected in the fine gravel filter during the work, this is done by inserting an ejector or polyethylene tube of sufficient diameter down to the bottom of the well and connecting the other end to a compressor.
d. final sealing of the well: finally, close to the surface, the space between the ground and the pipe is sealed using cement mortar; then a well head is fixed in order that the surface water cannot enter and penetrate deep.

Depending on the bore hole diameter the following non-toxic PVC pipes can be used, or ones in steel with threaded joints, and suitably perforated with microscopic holes:

Bole hole diameter

PVC or steel pipe

180 mm

120 mm

200 mm

140 mm

220 mm

160 mm

280 mm

200 mm

350 mm

250 mm

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