DURVINIL® RFS
SLOTTED DRAINAGE PIPE

The DURVINIL^® RFS micro-slotted drainage pipes are designed to reduce excess water in the soil, improving stability and mechanical properties by lowering pore water pressures.

They are widely used for stabilizing natural and artificial slopes installed in sub-horizontal boreholes that can extend over 50 meters. In more complex situations, such as very steep man-made slopes, they can be combined with additional drainage (trenches, wells, tunnels) or retaining works (walls, anchors, diaphragms), where the primary function of the drains is to relieve water pressure upstream of the structures.

In tunneling works, they are installed at the tunnel face, crown, or sides to reduce hydrostatic pressures and improve excavation stability and safety. Other applications include remediation of road, railway, and airport embankments, as well as reinforced concrete structures such as tunnels, bridges, and quay walls.

Each DURVINIL^® RFS drainage pipe can be fully covered with a polypropylene geotextile filter sock, stitched and available in different weights, to ensure effective groundwater filtration.

DURVINIL^® RFS slotted drainage pipes can also be installed in vertical boreholes with two main functions:

• As Pumping wells (diameters > 4’’): used for lowering the water table or for continuous environmental pumping, equipped with submersible pumps and available in diameters from 4’’ to 10’’.
• As Piezometer tubes (diameters from ½’’ to 4’’): used to monitor groundwater levels and pressures and for groundwater sampling.

The micro-slots allow water inflow while preventing coarse soil particles from entering, thereby avoiding well clogging. Slot dimensions are calibrated according to soil grain size distribution.

The DURVINIL^® Double Wall Screen system consists of two concentric micro-slotted PVC pipes connected by threaded flanges. The annular space is filled with a filtering material (thermoplastic granules or graded quartz sand, depending on soil conditions).

This system ensures high uniformity and density of the filter layer while providing easy installation in boreholes. The filtering elements can also be easily cleaned with high-pressure water lances, ensuring simple maintenance and long-term efficiency of the drainage system.