Mfg. electronic signalling cable loop for road or rail track - by placing layers of glass fibre-reinforced polyester in gutter-section loop mould and placing cable in when set

摘要

The method is intended for producing a mechanically resistant cable loop for installation near a road surface or rail track for electronic signalling. It comprises producing a largely flat mould with U or V-shaped cross-section and in the shape of the required loop. The mould preferably consists of glass fibre-reinforced polyester and is used to form a laminated gutter by applying a gel coating followed by manual application of e.g. four layers of glass fibre-reinforced polyester to form the gutter wall. After setting, the gutter wall is provided with at least one cable entry opening and the cable is positioned in the gutter, possibly using locating spacers. The remaining space is filled with setting material, preferably polyester resin containing a filler, preferably sand. The gutter pref. has a trapezium section with parallel sides around 35 mm and 50 mm long and around 40 mm high, and walls at least 2mm thick. Installation is with short side up.