| 摘要 |
A particular problem with filter drains used beside highways is that they generally comprise a trench within which an aggregate infill is provided in order to allow soak away. Unfortunately, vehicles which drift off the highway and into the trench may tend to "plough" that aggregate and become dangerously embedded, etc. In accordance with the present invention, a reinforcing mesh is provided at an appropriate location within the filter drain in order to ensure retention of appropriate soak away whilst inhibiting ploughing such that it is easier for a vehicle to extract itself from the filter drain. The reinforcing mesh comprises a perforated plastic sheet having regular sized apertures in order to bind any compression of aggregate into those apertures for resistance to ploughing. The reinforcing mesh 5 is positioned at a desired spacing below the aggregate surface within the trench of the filter drain. <IMAGE>
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