Method for giving a concrete surface visual and tactile detectable warnings, resulting surface, and components

Abstract

The present invention provides a method for giving a concrete surface visual and tactile detectable warnings for pedestrian traffic and users of wheeled conveyances. This method starts with an existing concrete surface on which the detectable warnings are desired. First it is determined where and in what pattern on the surface the detectable warnings are to be placed. Next, the concrete surface is marked at each space where a warning is to be placed. This can be done by manually measuring and marking or by placing a pre-made sticker sheet, cut to the size of the necessary surface and marked in the predetermined pattern directly on the surface. Next, a hole of predetermined depth and diameter is drilled into the surface at each mark. This can be accomplished using any tool or method acceptable for drilling a hole into concrete according to the specifications necessary for the hole. If a two-ply sticker sheet is being used, the first layer is removed. Next, a button is placed in the hole. Said button is to have a top in the shape of a truncated dome. The bottom of this truncated dome portion must be larger than the diameter of the hole so that it will rest on top of the concrete surface. An elongated member extends from the bottom of the truncated dome part of the button to a length not to exceed the depth of the drilled hole and of a diameter not greater than that of the hole but great enough to cause a secure fit of the elongated member in the hole. Epoxy may be used to increase the security of this fit. Any remaining sticker sheet on the surface is then removed leaving a concrete surface having detectable warnings securely embedded.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to pedestrian walkways, ramps, platforms and curbs used by the visually impaired. [0002] For the visually impaired, there is a need for a warning system in public transit facilities to decrease the level of risk of inadvertent street entry associated with the presence of curb ramps. Detectable warnings complying with existing ADAAG requirements can provide an effective stop signal for the visually impaired to determine the end of a sidewalk and the beginning of a vehicular way. [0003] American with Disabilities Act (ADA): “Accessibility Guidelines for Buildings and Facilities” instill the guidelines for the use of detectable warnings associated with the presence of curb ramps, walking surfaces, platforms and the like. The guidelines state that detectable warnings are to be in the form of a truncated dome with a diameter of 0.9 inch at the bottom, a diameter of 0.4 inch at the top, a height of 0.2 inch and a center-to-c...

AI Technical Summary

Benefits of technology

[0009] In brief summary, the method describes ways of marking the necessary surface in each spot that a truncated dome is required. This marking can be done either by apply a pre-made map to the surface or by measuring the surface by hand and making marks. The pre-made map can take two different forms. The best embodiment is a two-ply sticker sheet that is cut in the shape of the surface requiring the detectable warnings. Another embodiment can be a one-layer sticker sheet. Choosing between these two embodiments depends on the needs of the installer.

Problems solved by technology

However, use of this method is very expensive and labor intensive.

It is also limited to the initial forming of the concrete surface and cannot be used to retrofit an existing surface.

However, in practice, particularly in areas that experience extremely warm temperatures, these pre-cast tiles have trouble adhering to the surface and either bubble up or peel off.

In this event, an even greater danger is imposed on the handicap or visually impaired person who crosses the surface.

Also, the liability on the owner of the surface on which these tiles are placed increases dramatically.