Street drain with diagonal support structure - uses combination of calotte and sloping surface in each corner to stabilise grating.

摘要

Gutter drainage system in which the grating frame (4/5) fits into the corners of the street drain and consists of a quarter of a calotte (4) and a grating slope (5) at the ends of the grating bars (7), such that a ball shaped sloping support combination in the diagonal direction is created. The combination gives an automatically stabilising support for the grid (2) in the frame (1). The quarters of the calotte may have a given height with a given radius (10).