Tactile warning surface, method, and apparatus

Road structure – process – or apparatus – Process – In situ treatment of earth or roadway

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Details

249 2, 404 15, 404108, 404 82, E01C 1500, E01C 1950

Patent

active

058270094

ABSTRACT:
A tactile warning surface has an array of tactile elements made of a composite material formed on the surface of an existing substrate. The preferred composite material is a mixture of a dry powder aggregate and a liquid SBR latex. The tactile elements are in the form of truncated cones or flattened domes having a height of about 0.20 inch and a diameter of about 1.0 inch. A method for installing the tactile warning surface includes the steps of placing a mold sheet having an array of mold apertures with shapes corresponding to the tactile elements over the substrate area, injecting the composite material in a semi-liquid state under pressure into the apertures of the mold sheet, allowing the injected composite material to cure and harden, then removing the mold sheet. For increased durability in traffic-bearing applications, a pigment/aggregate mixture can be applied as a coating over the tactile elements and substrate area. The tactile warning surface is installed using an injecting machine having a hopper for receiving the composite material and an access slot below for releasing it into the mold apertures of the mold sheet. The machine can also include a vibrator and arm extending into the hopper for vibrating the semi-liquid composite material.

REFERENCES:
patent: 4349588 (1982-09-01), Schiffer
patent: 4715743 (1987-12-01), Schmanski
patent: 4932182 (1990-06-01), Thomasson
patent: 5217319 (1993-06-01), Klohn
patent: 5302049 (1994-04-01), Schmanski
patent: 5320790 (1994-06-01), Lowe
patent: 5487526 (1996-01-01), Hupp

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