FI115549B - Slipperiness prevention method for roadways involves spreading friction material in predetermined spots to form uneven friction surface - Google Patents

Abstract

Friction material is spread from a dispenser (5) in a vehicle (2) in a patch like and/or strip like pattern to form an uneven friction surface. The material used is e.g. water (4) containing additives to make it gelatinous, and is under-cooled before being pressure sprayed onto the road surface. The exhaust pipe (9) of the vehicle can be used to supply heat to the dispenser via a bypass (10) if necessary. An independent claim is also included for an apparatus used for preventing the slipperiness of a roadway.

Description

115549

METHOD AND APPARATUS FOR PREVENTING A TRAFFIC OR SIMILAR SKIPING BY Friction Material

The present invention relates to a method and apparatus according to claim 1 for preventing a carriageway or similar slip.

Methods used for de-skidding are based on the adhesion of friction material, organic or inorganic, sand, gravel, crushed stone, light gravel, peat, chips, chips, etc., to the substrate by the addition of water. The "sticking" effect of the gripper-10 occurs when the surface temperature of a walkway or traffic area, such as a road, is below + 0 ° C, and wet friction material over + 0 ° C sprinkled on its surface with a dispenser freezes to its substrate (road, etc.). By "gluing" the friction material to its substrate, finer (less-15 granular) friction material and lower layer thicknesses can be used to produce a larger working area in one fill compared to the same amount of raw material, "glued" , or casting at the bottom of the grooves, but they remain in place for an effective lifetime of 20 and the number of work cycles can be reduced. By using the "gluing method" it is possible to use lighter materials such as light gravel or organic materials (chips, chips, etc.).

DE-A-3732657 discloses a method for improving the adhesion of an ice surface using granular, water-insoluble friction material, in particular sand. The friction material is moistened and warmed before ·· application to the road surface. However, wetting the friction material as well as heating it before application is quite difficult and requires additional equipment, which causes additional costs. The heating costs of the friction material · ... 30 also incur additional costs.

* »·. Fl patent specification 105353 discloses a method of sanding a road or the like, wherein the sand is sprinkled from a moving vehicle to the desired width, ··· * to produce a sanded lane. The sand is anchored to the icy substrate by heating the sand particles with slides past the sanded area, which apply a frictional and pressure effect after scattering. This causes the sand to warm up and sink into the ice. Also. In the method of the publication I · 2 115549, additional equipment for heating the sand is required, which causes additional costs.

The object of the present invention is to eliminate the disadvantages of the prior art and to provide a novel method and apparatus for preventing slippage. The invention is based on the application of a friction material to a substrate as such and the application of a fluid for wetting it to a substrate separately upon application of a friction material. The liquid may be applied to the substrate in the form of spots of the desired shape or the like, thereby obtaining friction material regions of the desired shape.

Detailed features of the method and apparatus of the invention are set forth in the appended claims.

According to the invention, the friction material can be applied to the substrate as such without application prior to wetting, thereby reducing the number of work steps required before applying the friction material. The method according to the invention is simple and reliable. Also, the hardware required is very simple, especially since no friction material-liquid mixing device is required.

By using, for example, patches of frictional material, it is also possible to save frictional material and, if desired, to control the path of a vehicle on a slippery road while it slides on an icy surface.

In the following, the invention will be described in more detail by way of example with reference to: - the accompanying drawing, the figure of which shows an apparatus according to the invention for preventing a carriageway or the like from being fitted to a truck.

... 30

The figure shows a lorry 2 moving on road 1. The lorry 2 is fitted with an anti-slip, preferably granular, friction material, such as sand, according to the invention. For this purpose, the plant has a pallet 3 on which the gravel 4 to be spread is loaded. In addition, for example, the vehicle has a fluid reservoir 5 mounted on the front 35 of the pallet 3 when applying sand to the carriageway 1. ···. water for 6. The fluid reservoir 5 and also the pallet 3 may be thermally insulated.

3, 115549

In the method according to the invention, the sand 3 is applied as such to the carriageway by means of a spreading / scattering device 7 provided on the pallet 3.

The water 6 is sprayed onto the surface of the carriageway 1 prior to applying the sand by means of a liquid dispenser 8 in front of the spreading 5 / scattering device 7, to which water is led through a pipe 9. The dispenser 8 has nozzles 10 for spraying water in the desired manner on the substrate, for example as spots 11, whereby the sand adheres only to the substrate. spots in the area of the road. This saves the amount of sand needed for sanding. Stripes can be used instead of spots, which in some cases makes it possible to steer the car sliding on the ice in a certain direction.

When using lighter friction material than water, instead of sand, it will not dive as a result of the instantaneous melting of the environment, but will remain in its melting cavity to re-freeze and act as desired.

15 By "gluing" organic materials as friction material, they can be brushed directly into green areas in spring, saving cleaning and transport costs.

A bypass 13 may be provided in the exhaust system 12 of the car adjacent to the tank 5 and the platform 3 20 to provide waste heat to heat them as needed. The liquid dispenser 8 and the tube 9 can also be heated therewith. The amount of heat can be adjusted by the driver by adjusting the exhaust gas bypass valve 14. The temperature of the water to be supplied can be optimized for the effects of the weather and the outside temperature, if necessary by cooling. When used under pressure; After spraying, the water may be sub-cooled before spraying.

, · 1 »> t I ·

It will be apparent to one skilled in the art that the various embodiments of the invention are not limited to the examples above, but may vary thereafter. within the scope of the following claims.

> 111 30

Thus, the friction material may also be, for example, triangular ice cubes, which always adhere to one side of the substrate, ensuring optimum adhesion: to the moistened substrate, and thus requiring no other friction material.

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Claims (6)

A method for preventing the slip of a carriageway (1) or a similar substrate comprising applying to the substrate a friction material (4) wetted by the resultant freezing liquid, wherein the friction material adheres to the substrate when the temperature drops to or below the freezing point of the liquid without wetting, and - the liquid is fed to the substrate during application of the friction material, preferably 10 prior to application of the friction material. characterized in that - the liquid is supplied to the substrate, for example, by means of a nozzle (10) at certain points (11), and - the points (11) are spotted and / or striped. Method according to claim 1, characterized in that the friction material consists of small ice particles. Process according to Claim 1, characterized in that the friction material consists of organic and / or inorganic material. 20 4. Vehicle-mounted equipment to prevent slipping of a roadway (1) or a similar substrate with a container (3) for friction material and a applicator (7), * I '·', for applying friction material (4) to the surface, wetted by contact with the freezing liquid on its support, whereupon the friction material adheres to: 1: 25 when the temperature drops to or below the freezing point of the liquid; : which hardware. - the friction material applicator (7) is adapted to apply the friction material to the substrate without wetting, and the liquid supply device (10) is arranged near, preferably in front of, the friction material applicator (7) so that the liquid is fed to the substrate. > '·; material application, preferably prior to application of the friction material. characterized in that: - the liquid feeding device has nozzles (10) for feeding the liquid to the substrate 35 at certain points (11), and - which points (11) are spotted and / or striped. 5, 115549 4, 115549 Apparatus according to claim 4, comprising a liquid container (5), characterized in that at least the liquid container is thermally insulated. Apparatus according to claim 5, comprising a temperature control system for at least the fluid reservoir, the piping and / or the fluid supply device, characterized in that it comprises a control device (14) for controlling the temperature of the liquid. > · • »• I 1 6 115549