JPH04124307A - Artificially frozen road - Google Patents

Abstract

PURPOSE:To provide an artificially frozen road which can be used for a long period of time without causing cracks even if temperature changes and which is usable as a test course of automobiles without causing trouble by disposing reinforcing materials in a frozen layer. CONSTITUTION:An artificially frozen road 1 comprises a frozen layer 2 and reinforcing materials 3 having a checkerboard-like shape. One layer of reinforcing materials 3 formed from fiber-reinforced plastics having a checkerboard-like shape is disposed in a frozen layer 2 intermediate in width direction. A pond 4 for storing water to be frozen, comprising a bottom 5 and side walls 6, is provided, in which the bottom 5 has a smooth surface. An expansion absorbing board 7 is interposed between the wall 6 and the road 1. Further, a frosting preventive layer 8 is formed from gravel etc. Tensile forces which act on ice due to differences in expansion or contraction between ice and concrete caused by changes in temperatures are born by the materials 3 and hence cracking of ice are avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to artificial icy roads. In particular, it relates to artificially frozen roads such as automobile test courses in cold regions.

(Prior Art) Conventional icy road test courses are established on natural ice such as lakes and marshes.

(Problems to be Solved by the Invention) In recent years, it has become difficult to use conventional test courses on natural ice due to environmental problems.

On the other hand, it is possible to create a test course using artificial rice by constructing a shallow pond on land, but this has not yet been established. The reason for this is that even though it is necessary to avoid even minute cracks in the ice on test courses, the problem of preventing ice cracks from occurring has not been resolved. Also,
The method of cutting natural ice from lakes, etc. or ice made in freezers and arranging them on a test course is not suitable because there are many seams in the ice and it is time-consuming.

SUMMARY OF THE INVENTION An object of the present invention is to provide an artificially frozen road such as a test course that prevents ice from cracking and allows vehicle driving tests to be carried out safely and reliably.

(Means for Solving the Problems) In order to achieve the above object, the present inventor conducted research on ice cracks that occur on artificially frozen roads, and established the present invention. The present invention relates to an artificially frozen road characterized in that a reinforcing material is provided within the frozen layer of the frozen road.

Cracks that occur on artificially frozen roads after freezing are caused by sudden changes in temperature. The temperature change is 20 degrees even below freezing.
Temperatures may reach temperatures above °C. With such temperature changes,
The ice itself expands and contracts, and the difference in expansion and contraction between the ice and the roadbed made of concrete, etc. that is in contact with the bottom of the ice causes a tensile force to act on the ice, causing cracks. Furthermore, some of the cracks that occur on artificially frozen roads are caused by the wheel loads and braking loads of vehicles traveling on the frozen roads.

Artificially frozen roads must be prevented from causing the above-mentioned cracks because they are used as test courses and the like.

In the present invention, a reinforcing material is provided along the frozen surface within the frozen layer of the artificially frozen road. Normally, the reinforcements are placed approximately horizontally. It is preferable that each reinforcing material is arranged so as to have as little directionality as possible, for example, in a lattice shape, a hexagonal shape, etc. The reinforcement body of type B shall be manufactured on-site or in advance at a factory.

The reinforcement strengthens the ice and prevents cracks from forming. Various types of reinforcing materials can be used, such as fiber reinforced plastics (FRP), polymers, and reinforcing bars, but transparent or white reinforcing materials are preferable. When the reinforcing material is shaped like a lattice, the spacing thereof is, for example, about 10 cm. This reinforcing material is arranged within the frozen layer when it freezes, and is arranged in one or several stages above and below depending on the thickness of the frozen layer. For example, when the ice thickness is 10 CII, there is one stage, and when the ice thickness is 20 cm, there are about two stages.

If reinforcing bars are used as they are as reinforcing materials in the present invention, since the reinforcing bars are black in color, ice around the reinforcing bars will melt due to temperature rise under sunlight, and the reinforcing bars will no longer serve as reinforcement for the ice, and rust will occur. This tends to deteriorate the adhesion of reinforcing bars.

For this reason, when reinforcing bars are used, it is preferable to take measures to prevent them from absorbing heat from sunlight and rusting, such as applying white paint.

Note that cracks that occur in ice may occur when the ice bulges due to the surrounding area being restrained against volumetric expansion during freezing. This cracking can be prevented by installing expansion absorbing plates around ponds filled with water due to freezing.

A cushion material such as rubber or styrofoam is used as the expansion absorbing plate. The ice thickness on artificially frozen roads is 5CID to several 10C1
It is 1.

The width of the artificial icy road as a test course is 20 to 30 mm.
m, lengths range from 500 m to several. An artificially frozen road of this size is made by filling a pond with water and freezing it, but it may be frozen as a whole, or it may be frozen in sections of about 5m x 5m, for example.

In addition, the bottom surface of the pond that supports the artificial frozen road is usually a flat surface corresponding to a horizontal surface, and that plane is also a smooth surface.
It is preferable that the surface be free of irregularities such as grooves, since cracks are likely to occur if the bottom surface is irregular.

(Function) As the temperature changes, the ice and the concrete in contact with the bottom of the ice expand and contract, and the difference in expansion and contraction between the ice and the concrete causes a tensile force to act on the ice, causing cracks.

The present invention prevents cracks from occurring by having the reinforcing material share the tensile force acting on the ice.

In addition, when cracks occur due to the load of a car, etc., when the load acts partially on the ice, the ice is bent and a tensile force is generated, causing cracks. The reinforcing material that is integrated with the ice disperses it over a wider area, and the reinforcing material also shares the generated tensile force, making it difficult for cracks to occur.

(Example) In this example, 1 is an artificial ice road with a width of 15 m and a length of 700 m, and is composed of an ice layer 2 and a reinforcing material 3 in the form of a grid.

The frozen layer 2 has an ice thickness of 10C11. The lattice-shaped reinforcing material 3 is arranged in one stage at the middle of the frozen layer in the thickness direction with a lattice interval of 10CI11. The material of the lattice-shaped reinforcing material 3 is fiber reinforced plastic (FRP). 4 is a pond filled with water for freezing, and is composed of a bottom surface 5 and side walls 6. The bottom surface 5 is formed as a smooth surface without unevenness.

An expansion absorption plate 7 is interposed between the side wall 6 and the artificial ice road 1. 8
is a frost heave suppression layer and is formed from gravel, gravel, etc.

An artificial icy road was constructed according to this example. No cracks appeared on the artificially frozen road, and it could be used as a test course for cars.

(Effects of the Invention) Since the present invention is constructed as described above and is provided with reinforcing materials, the artificially frozen road can be used for a long time, and cracks do not occur even when the temperature changes. There were no problems when used on the course.

Further, by interposing an expansion absorbing plate around the artificially frozen road, it is possible to prevent cracks from occurring in the peripheral area.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view, partially cut away, of an embodiment of the artificial icy road of the present invention. l...Artificial ice road, 2...frozen layer, 3...reinforcement material, 7...expansion absorption plate diagram

Claims (1)

[Scope of Claims] 1. An artificial icy road for forming ice on the ground, characterized in that a reinforcing material is disposed within the frozen layer. The artificial icy road according to claim 1 or 2, wherein an expansion absorption plate is interposed around the icy road 3 and the artificial icy road.