Multilayer net for draining fluids, particularly for geotechnical use

Abstract

A multilayer net for draining fluids, particularly for geotechnical use, comprising an intermediate layer, constituted by a plurality of intermediate and substantially mutually parallel filaments, and first and second outer layers, which are constituted by first and second outer filaments which are inclined with respect to the intermediate filaments, the intermediate filaments forming an angle other than zero with respect to the main direction of extrusion of the net from an extruder.

Description

BACKGROUND OF THE INVENTION[0001]As is known, U.S. Pat. No. 5,255,998A, assumed included herein by reference, discloses a multilayer net for draining fluids which is generally constituted by a first layer of mutually parallel filaments which is associated with a second layer or intermediate layer of filaments, which also are mutually parallel and in turn are connected to a third layer of filaments, which are mutually parallel and inclined with respect to the filaments of the first layer and the filaments of the intermediate layer.[0002]In such embodiment, the layers are rigidly coupled to each other so as to provide, at the intermediate layer, drainage channels which extend along the direction of extrusion from the extruder.[0003]Because of this, the net, once produced and collected in reels, if it is used for example to provide drainage at roads, must be used in portions which are arranged transversely to the longitudinal extension of the road, since the intermediate layer in pract...

AI Technical Summary

Benefits of technology

[0006]The aim of the invention is to eliminate the drawbacks noted above by providing a multilayer net for draining fluids particularly for geotechnical use which can be applied directly along the longitudinal direction of the road yet achieves correct elimination of the drained water.

[0007]Within this aim, an object of the invention is to provide a multilayer net which can be installed easily and quickly, allowing to roll the net into a reel or spool easily, thus facilitating transport.

[0008]Another object of the present invention is to provide a multilayer net which, thanks to its particular constructive characteristics, is capable of giving the greatest assurances of reliability and safety in use.

[0009]Still another object of the present invention is to provide a multilayer net for draining fluids particularly for geotechnical use, which can be obtained easily starting from commonly commercially available elements and materials and is also competitive from a merely economical standpoint.

Problems solved by technology

Because of this, the net, once produced and collected in reels, if it is used for example to provide drainage at roads, must be used in portions which are arranged transversely to the longitudinal extension of the road, since the intermediate layer in practice forms longitudinal channels which accordingly, if the net were used parallel to the axis of the road, would not allow elimination of the drained water.

This method of operation necessarily entails a considerable expenditure of time for laying, with a higher likelihood of defective installation arising from the incorrect side-by-side arrangement of the portions and from the incorrect provision of the joints between the side-by-side layers.

Moreover, there is the risk of having waste of unusable material, and the laying times and costs affect considerably the cost of the completed work.

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