JPH0361801B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a prefabricated paving method in which high-frequency heating is applied to pave preformed paving materials such as concrete blocks and asphalt blocks, that is, prefabricated paving materials.

Conventionally, when paving prefabricated paving materials on a base such as a concrete slab, in most cases, hard-mixed cement mortar is spread with a trowel to a thickness of about 10 to 15 mm, the prefabricated paving materials are laid on top of this, and the joints are filled with cement mortar. method is used. However, when the base is a flexible pavement such as asphalt pavement material, or a base that is subject to deflection due to load or vibration due to load or impact, such as steel deck slabs (for example, road bridges, pedestrian bridges, etc.), it is a rigid body. The cement mortar layer is prone to cracking and peeling, and especially in steel deck slabs, there is a problem that rainwater seeps through and corrodes the steel deck. Furthermore, the cement mortar layer also has drawbacks such as shrinkage cracks. Therefore,
Although there is a desire to bond prefabricated pavers to substrates with flexible, viscoelastic materials such as bituminous mixtures, no suitable construction method has yet been developed.

The present invention meets these demands and provides a new prefabricated paving method in which prefabricated paving materials are paved using a flexible mixture layer such as bituminous material or a thermoplastic mixture as a binding layer. It is something to do.

That is, the present invention provides a layer made of a mixture of a binder such as a bituminous material or a thermoplastic mixture, and an aggregate and a filler, at least a part of which is made of a material that generates heat due to high frequencies, on a base. Then, after laying the prefabricated paving material on the upper surface, the mixture layer is heated and softened by applying high frequency waves from above, and the prefabricated paving material is bonded to the base via the mixture layer. This relates to a prefabricated pavement construction method that applies high-frequency heating, and also includes binder materials such as bituminous materials and thermoplastic mixtures, and aggregates and fillers that are made of materials at least in part that generate heat by high-frequency waves. The prefabricated paving material, which has a layer of a mixture of This relates to a prefabricated pavement construction method that applies high-frequency heating, which is characterized by the following:

The method of the invention will be explained below by means of illustrated embodiments.

FIG. 1 is a side view showing one row of a prefabricated pavement construction method using high-frequency induction heating. In the figure, 1 is the base.

The base 1 is a construction base on which prefabricated paving materials are laid and paved. For example, when prefabricated paving materials are installed on the deck of a road bridge or pedestrian bridge, the deck becomes the base. When paving prefabricated pavers on top of asphalt pavement, the pavement surface becomes the base. In addition, when paving prefabricated paving materials on concrete pavement, concrete slabs serve as the base.

2 is aggregate made of material that generates heat due to high frequency;
Filler (hereinafter referred to as exothermic aggregate, filler)
It is.

The exothermic aggregate, filler 2, is a material that generates heat when placed in a high-frequency electric or magnetic field, and includes metals, metal compounds, ores, granules such as slag, fibers, aggregates, etc.
and black smoke powder, carbon fiber, etc.

3 is a mixture layer (hereinafter referred to as the mixture layer) containing exothermic aggregate and filler 2, a binder such as bituminous material or a thermoplastic mixture (hereinafter referred to as binder such as bituminous material), and a small amount of Some of them are exothermic aggregates,
It consists of aggregate consisting of filler 2 and a mixture with filler.

exothermic aggregate in the mixture of mixture layer 3;
The amount of filler 2 is usually about 2 to 30% by weight, but it may be larger than this. but,
In terms of heat generation effect, 30% by weight or less is sufficient.

The bituminous material, thermoplastic mixture, etc. used as the binder are as follows.

Bituminous materials are bituminous materials made of one or more selected from petroleum asphalt, natural asphalt, tar, bitumen, etc. These bituminous materials are combined with rubber, synthetic polymers, resins, mineral oils, and processed materials. There are bituminous materials mixed and modified by appropriately adding one or more kinds of oils, plasticizers, etc.

Thermoplastic mixtures include thermoplastic polymers, thermoplastic natural resins, synthetic resins and their derivatives, and mixtures of these materials with the appropriate addition of rubber, mineral oil, process oil, plasticizers, fats and oils, etc. etc. The thermoplastic mixture can be used either in the form of an emulsion or in the form of a cutback with the addition of a solvent.

4 is prefabricated paving material, which is a shaped paving material or paving material used for pavement or paving, such as concrete block, concrete slab, asphalt block, asphalt concrete slab, stone slab, stone block, tile, brick tile. , artificial stone slabs, synthetic stone slabs, wood block blocks, etc.

5 is an inductor, and 6 is a high frequency generator.

First, we will prepare the foundation 1. Then, a bituminous emulsion or the like is sprinkled on the top surface to form a prime coat or tack coat. For road bridge decks, an adhesive prime coat is usually applied by spraying or painting. In addition, if a waterproof layer is provided, it is provided on top of the adhesive prime coat. The above-mentioned prime coat, tack coat, etc. may be omitted depending on the case.

Next, a mixture layer 3 containing exothermic aggregate and filler 2 is provided on the base 1. The mixture layer 3 contains exothermic aggregate, at room temperature or in a heated state.
It is formed by spreading a mixture containing the filler 2 to a required thickness and then rolling it, but it can also be formed by laying a mixture formed into a sheet, plate, or the like. If necessary, the mixture layer 3 formed into a sheet or plate shape is fixed in place by nailing or adhesive. When the surface of the mixture layer 3 formed into a sheet or plate shape is formed to have pressure-sensitive adhesive properties and a release sheet is attached, the release sheet may be peeled off and stretched on the substrate 1. In this way, the mixture layer 3 is provided on the base 1, and the prefabricated paving material 4 is spread on it. In this case, a tack coat such as a bituminous emulsion may be provided on the mixture layer 3 and the prefabricated paving material 4 may be laid down.

Also, depending on the situation at the site, a prefabricated paving material 4 having a mixture layer 3 on the lower surface is laid on the base 1. In this case, it is possible to omit providing the mixture layer 3 on the substrate 1 in advance.

Such prefabricated paving material 4 can be made by bonding the mixture layer 3 to the back side of prefabricated paving material 4 such as concrete blocks in a factory, or by bonding the mixture layer 3 to the back side of prefabricated paving material 4 at a paving site prior to paving. Alternatively, the mixture layer 3 formed into a plate shape may be cut into a certain size and stretched. In this case, mixture layer 3
It is easier to install if the surface has pressure-sensitive adhesive properties.

In addition, when prefabricated paving material 4 is molded from a mixture using a heat-melting material such as asphalt block as a binder, a mixture layer containing exothermic aggregate and filler 2 is placed in the lower layer during molding. Even if it is molded in this way, the aggregate in the entire mixture, the exothermic aggregate in a part of the filler, the exothermic aggregate in the entire mixture using the filler 2, and the prefabricated paving material 4 in which the filler 2 is mixed. It can also be used by molding it.

Next, high frequency waves are applied from above this prefabricated paving material 4.

When a high frequency current is transmitted from the high frequency generator 6 to the inductor 5, magnetic lines of force, that is, a high frequency magnetic field are generated.
Eddy currents are generated, Joule heat is generated, and the mixture layer 3 is uniformly heated and melted or softened from the inside to develop a bonding force, which allows the prefabricated paving material 4 to be bonded to the base 1 and integrated. can.

The frequency applied to induction heating is selected depending on the shape and dimensions of the prefabricated paving material 4, the composition of the mixture layer 3, the temperature, etc., but for practical purposes, a high frequency of 50 KHz (kilohertz) or less, which is applied to heat treatment of steel, is appropriate. It is.

FIG. 2 is a side view showing an example of a prefabricated pavement construction method applying high-frequency induction heating. Similar to FIG. 1, a mixture layer 3 containing exothermic aggregate and filler is provided on a base 1. After laying the prefabricated paving material 4 on its upper surface, a high frequency voltage from a high frequency oscillator 7 is applied to high frequency electrodes 8,8. A flat plate, grit, etc. is used as the high frequency electrode 8, and the mixture layer 3
It goes without saying that they should be appropriately selected and arranged according to the shape of the mixture layer 3 so that high frequency waves are transmitted to the mixture layer 3, and if necessary, a shield 9 may be provided to prevent leakage of radio waves.

When a high-frequency electric field acts on the mixture layer 3, the moisture in the dielectrics of the mixture layer 3, particularly the bituminous emulsion, rubber latex, etc., generates heat, and the mixture layer 3 is heated from within. In this way, the prefabricated paving material 4 can be bonded and integrated onto the base 1 via the mixture layer 3.

High-frequency heating from above the prefabricated paving material 4 is performed by induction heating when the mixture layer 3 does not contain water, such as a heated bituminous mixture, and when it is a bituminous emulsion or latex mixture, or also when it is mixed with aggregate. Dielectric heating is applied when the moisture content is high.
Furthermore, depending on the situation, both dielectric heating and induction heating can be used in combination to promote heating of the mixture layer.

By high-frequency heating, prefabricated paving material 4 and base 1
The mixture layer 3 interposed between the prefabricated paving material 4 and the base 1 is heated and melted or softened more quickly than the inside, and exhibits a bonding force to firmly bond the prefabricated paving material 4 and the base 1, thereby constructing a prefabricated pavement. can.

Moreover, as an application of the prefabricated pavement construction method of the present invention, pavement similar to ordinary asphalt concrete pavement can be obtained using asphalt concrete plates as a prefabricated paving material.

In addition, in the formulation of asphalt concrete plates of prefabricated paving materials and the mixture that constitutes asphalt concrete blocks, for example, exothermic aggregates and fillers such as steel fibers and iron granules may be added, or they may be further bonded. Using modified asphalt as the material, we press-form it in a factory to produce asphalt concrete plates, asphalt blocks, etc. with high stability and friction resistance, and then lay these on a foundation and apply high frequency to it. It is also possible to construct a bituminous pavement with extremely superior flow resistance and abrasion resistance compared to conventional pavement.

The prefabricated pavement construction method of the present invention has the following excellent features and effects.

(1) The bonding layer between the base and prefabricated paving material is a bonding material such as bituminous material that is different from conventional cement mortar.
The prefabricated paving material is bonded to the base by using a mixture layer that uses exothermic aggregate and filler in at least a portion of the layer, and heating this layer efficiently from within using high frequency to melt or soften the binding material. It is.

(2) High-frequency heating does not use fuel such as gas or kerosene, or fire, is clean and easy to work with, and efficiently brings the mixture layer to the desired temperature from the inside in a short time. It can be heated and, via the mixture layer, the prefabricated paving material can be firmly bonded to the base. The mixture layer can be made of a room-temperature mixture, such as a bituminous emulsion mixture containing exothermic aggregates and fillers, which has moisture, but is heated from the inside using high-frequency heating to evaporate the moisture and combine as a heated mixture. Therefore, the mixture layer can be made to have excellent water resistance.

(3) Unlike cement mortar, the mixture layer has flexibility, so it can follow even if the base is flexible or vibrates, and it can also absorb stresses such as loads, vibrations, and shocks. Since it can be relaxed, good bonding can be maintained.

(4) Waterproof pavement can be created using prefabricated paving materials.

(5) Using prefabricated paving materials, highly stable pavement can be constructed easily, quickly, and reliably.

[Brief explanation of drawings]

In the figures, Fig. 1 is a side view showing one embodiment of the prefabricated pavement construction method applying high frequency induction heating of the present invention, and Fig. 2 is an embodiment of the prefabricated pavement construction method applying high frequency dielectric heating of the present invention. FIG. In the figure, 1 is a base, 2 is a heat-generating aggregate and filler, 3 is a mixture layer containing heat-generating aggregate and filler, 4 is a prefabricated paving material, 5 is an inductor, 6
is a high frequency generator, 7 is a high frequency oscillator, 8 is a high frequency electrode, and 9 is a shield.

Claims (1)

[Scope of Claims] 1. A layer made of a mixture of a binder such as bituminous material or a thermoplastic mixture, and aggregate and filler, at least a part of which is made of a material that generates heat by high frequency waves, on a base. Then, after laying a prefabricated paving material on the upper surface thereof, the mixture layer is heated and melted or softened by applying high frequency waves from above, and the prefabricated paving material is bonded to the base via the mixture layer. A prefabricated pavement construction method that uses high-frequency heating. 2 Prefabricated paving material having a lower layer made of a mixture of a binder such as bituminous material or a thermoplastic mixture, and aggregate and filler, at least a portion of which is made of a material that generates heat due to high frequency waves. A prefabricated pavement construction method applying high frequency heating, characterized in that the mixture layer is laid on a base and high frequency is applied from above to melt or soften the mixture layer, thereby bonding the prefabricated paving material onto the base.