JPH044402B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a road pavement construction method.

Conventionally, the construction method for paving roads with thermoplastic granular materials such as asphalt, coal tar, and pitch has been to heat the paving granular materials in advance to a melted and softened state, and then remove them onto the road surface in layers. After that, the method of solidifying under pressure is widely used, but this construction method not only requires a large amount of thermal energy for heat treatment of paving granular materials, but also causes a large loss of thermal energy, and is extremely inefficient. bad.

In addition, when paving granular materials such as asphalt, coal tar, pitch, bakelite, etc. on a concrete layer, the crystallized water in the concrete is heated at 800℃ and separated, and its internal pressure causes it to form a cleavage plane parallel to the heated surface. Because it will be destroyed along
It is not easy to correct it or to develop a paving method that operates at temperatures below 800 degrees Celsius.

This invention aims to solve the above-mentioned problems, and its main purpose is to provide a road pavement construction method that can significantly save thermal energy and improve work efficiency. be.

The road pavement construction method according to the present invention involves removing a thermoplastic granular material such as asphalt, coal tar, and/or pitch on crushed concrete stone or crushed mineral stone in a layered manner, irradiating microwaves from above, and removing the thermoplastic granular material. The gist of this method is to melt and soften the concrete by its internal dielectric heating effect, cover it with crushed concrete stone or crushed mineral stone, and solidify it under pressure.

As the road paving granular material, thermoplastic materials such as asphalt, coal tar, pitch, etc. are used.

In the drawing, reference numeral 1 is a running vehicle body constituting the road paving device, and iron frame rollers 2 are the front wheels.
Two left and right tire rollers 3 are used as rear wheels.
A support part that supports a microwave irradiator 4, which is used for the purpose described below, in a vertically movable manner is positioned at a required height in the front of the vehicle body. That is, 5 is a support plate supported on the vehicle body side,
Reference numeral 6 denotes a movable platen on the lower side, and screw shafts 7 are installed in each of the four sides of the movable platen 6, and each screw shaft 7
is supported through the support plate 5, and a gear 8 is screwed to the upper end of the support plate 5 through its inner threaded portion.
Each worm gear 9 is meshed with a worm 10, and a bevel gear 12 fixed to one end of a shaft 11 of this worm 10 and a bevel gear 14 fixed to one end of another shaft 13 are meshed. , said shaft 13
A bevel gear 18 attached to the tip of a rod 17 operated from the vehicle body side by a handle 16 is meshed with a gear 15 fixed to the other end.
The rotation of the irradiator 4 through the gear mechanism
A movable platen 6 supporting the can be adjusted up and down.

The microwave irradiator 4 is a rectangular waveguide 4a.
and a ratuppa-shaped guide frame 4b connected to the lower side thereof,
A radio wave shielding plate 4c made of wire mesh projects horizontally from the opening, and a shielding plate 4 made of wire mesh hangs down from its tip.
d, and the rectangular waveguide 4a is formed by a movable platen 6.
It is supported through.

A square waveguide 19 opposite to the square waveguide 4a of the movable platen 6 is supported through the center of the support plate 5, and the waveguide 19 is supported by an impedance matching waveguide supported on the vehicle body side. 3 stub chuyuna 2
0, is connected to a microwave oscillator 23 via a power monitor 21 and an isolator 22. 23
a is the operating handle of the oscillator.

The microwave oscillator 23 is connected by a cable 26 to a commercial frequency alternating current generator 25 driven by a diesel engine 24 which is the prime mover of the vehicle body.

The isolator 22 and the microwave oscillator 23 are provided with a cooling water supply pipe 27 and a drain pipe 28.
is connected to a water supply pump 29 driven by the diesel engine 24. power monitor 21
, there is a meter 31 for measuring radio wave output on the meter panel 30.
and a meter 32 for measuring radio wave reflected power.

The water supply pump 29 is combined with a cooling water circulation spray cooling tank 33 . 34 is a delivery pipe, 3
5 is a collection pipe, 36 is a sprayer, and the above-mentioned delivery pipe 34
has a built-in overbody using activated carbon.
The circulating spray cooling tank 33 is connected to the microwave oscillator 2
3 and the isolator 22 are used to make the quality of the cooling water pure in order to prevent deterioration due to limescale precipitation in the cooling water, and can usually be omitted if it is not necessary.

At the front of the traveling vehicle body 1, a water withdrawal pipe 37 with a nozzle is provided above the iron frame roller 2, which is the front wheel, and a water supply pipe 38 connected thereto is connected to a water tank car (not shown). ing. Reference numeral 39 is a water supply control knob, which is placed near the driver's seat.

Next, an asphalt pavement construction method performed using the road paving device will be explained.

When constructing asphalt pavement, first, as shown in Figure 1, aggregate A such as crushed stone or cracked stone is laid down on the road surface, and then unheated asphalt granular material B is spread on top of it to form a layer. .

On the other hand, on the traveling vehicle body 1 side, a water supply pump 29 driven by the diesel engine 24 starts circulating cooling water to the isolator 22 and the microwave oscillator 23, and the engine starts circulating the cooling water to the alternator 25. generates electricity, oscillates microwaves from the microwave oscillator 23 by operating the handle 23a, and irradiates the microwaves toward the asphalt layer via the irradiator 4 applied to the asphalt layer. .

When irradiating microwaves, the height position of the microwave irradiator 4 from the ground is adjusted in advance by operating the handle 16, and the height from the ground is kept as low as possible, and the radio wave shielding plate 4c is ,4d
This prevents microwaves from leaking into free space. In addition, the three stubs of the three-stub tuner 20 are adjusted to achieve impedance matching on the receiving end side and the sending end side, and the deflection of the radio wave output measuring meter 31 on the meter panel 30 of the power monitor 21 is maximized. Also, the vibration of the radio wave reflected power measuring meter 32 is minimized. At this time, the isolator 22 absorbs the reflected power by heating the water supplied to it, and as a result, the microwave oscillator 2
The magnetron oscillation tube in No. 3 is oscillated under a constant load to protect the oscillation tube.

When the asphalt granules are irradiated with microwaves from the irradiator 4 as described above, the asphalt granules are uniformly heated from the inside in a short time due to the internal dielectric heating effect of the microwaves, melting and softening. Then cover with aggregate A such as crushed stone or cracked stone. This melt-softening method makes it possible to prevent deterioration of materials with poor thermal conductivity caused by oxidation effects over a long period of time during flame heating, which is the case with conventional materials. The melted and softened asphalt granular layer is pressed by the steel frame rollers 2 as the traveling vehicle body 1 advances, and is cooled by water withdrawn from the water withdrawal pipe 37 in front of the steel frame rollers, and becomes flat. Solidified and formed on the surface.

As described above, according to the present invention, there is no need to heat-treat the asphalt granules to be removed on crushed stone in advance during road paving construction, so that the troublesome heating work can be completely eliminated. Not only can the asphalt granules be irradiated with microwaves, but the asphalt granules are heated by the internal heating effect on the dielectric material, and the impedance of the irradiated surface such as a road that is the target of the oscillator's irradiation is reduced. Since it is equipped with a matching means, the height of the microwave irradiation with respect to the irradiation surface can be adjusted appropriately and the maximum power can be selectively applied to the irradiation surface by impedance matching each time, so uniform heating and melting can be achieved in a short time. As it has the advantage of being able to process asphalt, it can significantly reduce heating energy, and it synergistically works with the magnetron's high energy oscillation efficiency, resulting in significantly greater energy efficiency than conventional asphalt pavement construction methods. It is possible to improve the process, reduce time, and improve work efficiency at the same time.

Furthermore, this invention has the advantage that it can also be applied to the improvement and repair of road pavement. In other words, with conventional concrete pavement alone, when the concrete surface is irradiated with microwaves, the crystallized water in the concrete heats up to approximately 800℃.
This causes a strong cleavage action due to heating separation, which forms cleavage planes parallel to the irradiated surface, and the cleavage planes become disordered, making it impossible to obtain a flat finished surface, or due to explosive separation of the cleavage planes. The heating cleavage effect of microwave irradiation on concrete surfaces is particularly noticeable on ancient layers that have been stably cured for a long period of time. However, in the present invention, when microwaves are irradiated onto a thermoplastic granular material such as asphalt, coal tar, and/or pitch on concrete crushed stone or mineral crushed stone, the thermoplastic granular material has an internal dielectric heating effect of the concrete crushed stone or mineral crushed stone. It is melted and softened at low temperatures to cover crushed concrete stone or crushed mineral stone, and is then solidified, which can prevent the crystallization water in the concrete from heating and separating and causing the cleavage effect.
In addition, in the case of raised repair, the difference in melting temperature between conventional paving materials and raised repair materials is eliminated, so the effect of flat, uneven pavement can be expected to be even greater, and it can greatly contribute to the advancement and improvement of road pavement. .

[Brief explanation of drawings]

FIG. 1 is a side view of a road paving device showing an embodiment of the present invention, FIG. 2 is a plan view of the main part of the operating device of the microwave irradiator, and FIG. 3 is a plan view of a drainage pipe. 1... Traveling vehicle body, 2... Iron frame roller, 3... Tire roller, 4... Microwave irradiator, 5...
Support plate, 6... Movable plate, 7... Screw shaft, 8... Gear, 9... Worm gear, 10... Worm, 1
2...Bevel gear, 13...Shaft, 14...Bevel gear, 1
5... Gear, 16... Handle, 17... Rod, 18... Bevel gear, 19... Waveguide, 20...
3 stub tuner, 21...power monitor, 2
2...Isolator, 23...Microwave oscillator, 24...Diesel engine, 25...Alternator, 26...Cable, 27...Water pipe, 2
8...Discharge pipe, 29...Water pump, 30...Meter panel, 31...Meter for measuring radio wave output, 32...
...Radio wave reflected power measurement meter, 33...Circulation spray cooling tank, 34...Delivery pipe, 35...Recovery pipe, 36
... Sprayer, 37 ... Water withdrawal pipe, 38 ... Water supply pipe,
39...Kotoku for control.

Claims (1)

[Claims] 1. Thermoplastic granular materials such as asphalt, coal tar, and/or pitch are removed in a layer on concrete crushed stone or mineral crushed stone, and microwaves are irradiated from above to heat the thermoplastic granular materials by their internal dielectric heating effect. A road pavement construction method characterized by melting and softening crushed concrete stones or crushed mineral stones to cover them and solidifying them under pressure.