JPH04112910U - road paving equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a road paving device.

Conventionally, when paving a road surface with a thermoplastic granular material such as asphalt, coal tar, pitch, etc., the paving granular material is heated in advance to a melted and softened state, and after being spread in a layer on the road surface, pressure is applied. A solidification method is widely used, but this 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 has extremely poor work efficiency.

Furthermore, when paving with paving granular materials such as asphalt, coal tar, pitch, and bakelite on a concrete layer, the crystallized water in the concrete is heated and separated at 800°C, and its internal pressure causes it to cleave in parallel to the heated surface. It is not easy to repair or carry out pavement construction at temperatures below 800 degrees Celsius, as it is destroyed along the way.

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

This invention consists of a microwave oscillator, an irradiator that irradiates microwaves emitted from the oscillator onto an irradiation surface such as a road from above, and a means for matching the impedance of the oscillator to the irradiation surface such as a road. The gist is to have the following.

The present invention will be described in detail below with reference to an embodiment of the accompanying drawings. The road paving granular material of this invention uses thermoplastic materials such as asphalt, coal tar, and pitch.

In the drawings, reference numeral 1 denotes a traveling vehicle body constituting a road paving device, in which iron frame rollers 2 are the front wheels, and two left and right tire rollers 3 are the 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, 6 is a movable plate below it, screw shafts 7 are installed in each of the four sides of the movable plate 6, and each screw shaft 7 is connected to the support plate 5. A gear 8 is screwed into the upper end of the worm gear 8 through its inner threaded portion. is meshed with the worm 10, and a bevel gear 12 is fixed to one end of the shaft 11 of the worm 10.
and a bevel gear 14 fixed to one end of another shaft 13, and a gear 15 fixed to the other end of said shaft 13.
A bevel gear 18 attached to the tip of a rod 17 that is operated from the vehicle body side with a handle 16 is engaged with the movable platen 6 that supports the irradiator 4 through the gear mechanism by rotating the handle 16. It can be adjusted by moving up and down.

The microwave irradiator 4 is a rectangular waveguide 4a.
The rectangular guide frame 4b is formed of a wire mesh radio wave shielding plate 4c that protrudes horizontally from its opening, and a wire mesh shielding plate 4d that hangs down from its tip. A wave tube 4a is supported through the movable platen 6.

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. It is connected to a microwave oscillator 23 via a three-stub tuner 20, a power monitor 21, and an isolator 22. 23a
is the operating handle of the oscillator.

3 stub tuner 20 for impedance matching
When the wavelength of the microwave is λg, λg/
There are 3 placed at intervals of 4. The power monitor 21 has two holes in its partition wall with a distance of λg/4 along the radio wave direction, and the output wave has a distance of λg/4.
/4, it is measured by the radio wave output measuring meter 31 on the meter panel 30, and the reflected waves are measured by the radio wave reflected power measuring meter 32 on the meter panel 30 as they cancel each other out. The isolator 22 has a DC magnetic pole gap parallel to the radio wave passing direction, and is arranged so as to cover λg/4 centered on the point where the currents of the output wave and the reflected wave cancel each other, so that the output wave passes in one direction and the reflected wave does not. It points upward.

The microwave oscillator 23 is connected by a cable 26 to a commercial frequency alternator 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.

The water supply pump 29 is combined with a cooling water circulation spray cooling tank 33 . 34 is a delivery pipe. 35
numeral 36 is a recovery pipe, and numeral 36 is a sprayer, and the delivery pipe 34 has a built-in overbody using activated carbon.

The circulation spray cooling tank 33 is provided to prevent the microwave oscillator 23 and the isolator 22 from deteriorating due to scale precipitation in the cooling water, and to maintain the quality of the cooling water, and is normally not necessary. It can be omitted.

A water sprinkling pipe 37 with a nozzle is provided in the front part of the traveling vehicle body 1 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. 39
is a water supply control cock, located near the driver's seat.

Next, asphalt pavement construction performed using the road paving device of the present invention will be explained.

When constructing asphalt pavement, the first thing to do is
As shown in the figure, aggregate A such as crushed stone or cracked stone is laid on the road surface, and 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 a diesel engine 24 starts circulating cooling water to the isolator 22 and the microwave oscillator 23, and the engine also starts circulating cooling water to the alternating current generator. 25 is generated, microwaves are oscillated from the microwave oscillator 23 by operating the handle 23a, and the microwaves are irradiated to the asphalt layer via the irradiator 4 that is applied to the asphalt layer. let

When irradiating microwaves, use the handle 16.
The height position of the microwave irradiator 4 from the ground is adjusted in advance by the operation to keep the height from the ground as low as possible, and the microwaves are prevented from leaking into free space by the radio wave shielding plates 4c and 4d. prevent Also, 3 stub tuner 20
By adjusting the impedance matching on the receiving end side and the sending end side, the deflection of the radio wave output measuring meter 31 on the meter panel 30 of the power monitor 21 is maximized, and the deflection of the radio wave reflected power measuring meter 32 is adjusted. Ensure that runout is minimized. In addition, at this time, the reflected power of the isolator 22 is absorbed by the heating of the water supplied to it, and as a result, the magnetron oscillation tube in the microwave oscillator 23 oscillates with a constant load, thereby protecting the oscillation tube. ing.

When the asphalt granule layer is 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. Aggregate A such as crushed stone or split stone
Cover. 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 granule layer is pressed by the steel frame rollers 2 as the traveling vehicle body 1 advances, and is cooled by water sprayed from the water sprinkling pipe 37 in front of the steel frame rollers, so that the flat surface becomes smooth. solidified and formed.

As described above, according to the present invention, there is no need to heat-treat the asphalt granules to be spread on crushed stone in advance during road paving construction, so the time-consuming heating work can be completely eliminated. Not only can it be omitted, but the asphalt granules are irradiated with microwaves and heated by the internal heating effect on the dielectric material, and impedance matching to the irradiated surface such as a road that is the irradiation target of the oscillator is required. Since the microwave irradiation height relative to the irradiated surface can be adjusted appropriately and the maximum power can be selectively applied to the irradiated surface by impedance matching each time, uniform heating and melting can be achieved in a short time. It has the advantage of being able to be treated with asphalt pavement, and it also allows for a large reduction in heating energy, as well as synergistically with the high energy oscillation efficiency of the magnetron, resulting in vastly improved energy efficiency compared to conventional asphalt pavement construction. Improvements, time reduction, and work efficiency can be achieved at the same time.

Furthermore, the present 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 crystalline water in the concrete is heated and separated at approximately 800°C, causing a strong cleavage action, which forms cleavage planes parallel to the irradiated surface. The cleavage planes become disordered and a flat finished surface cannot be obtained, or the irradiator may be destroyed due to the explosive separation of the cleavage planes. In particular, the heating cleavage effect of microwave irradiation on concrete surfaces can last for a long time. The more stable and well-cured the ancient layer, the more remarkable it is. 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. Since it is melted and softened at low temperature to cover crushed concrete stone or crushed mineral stone and then solidified, it is possible to prevent the crystallization water in the concrete from being separated by heating and causing the cleavage effect, and In the case of raised repair, there is no difference in melting temperature between the conventional covering material and the raised repair material, so it can greatly contribute to the progress and improvement of road pavement, such as the ability to expect even more flat and uneven pavement effects.

[Brief explanation of the drawing]

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 the water sprinkling 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...Circulating spray cooling tank, 34...Delivery pipe, 35...Recovery pipe, 36
...Sprayer, 37...Water pipe, 38...Water supply pipe, 39...Control cock.

Claims (1)

[Scope of utility model registration request] A road comprising a microwave oscillator, an irradiator that irradiates the irradiated surface such as a road with microwaves emitted from the oscillator from above, and means for matching the impedance of the oscillator to the irradiated surface such as the road. Paving equipment.