JP6869043B2 - Road heating device - Google Patents

Description

The present invention relates to a road heating device.

Conventionally, on a road paved by the cold joint method in which a new pavement is laid adjacent to a cold existing pavement, if the adhesive force between the existing pavement and the new pavement is weak, Deterioration starts from the joint part. Therefore, the operator uses a road heating device to heat the end portion of the existing pavement to soften it and enhance the adhesive force of the joint portion (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-37800

However, the heating device of Patent Document 1 is suspended from a support member attached to the road machine and heats the end portion of the existing pavement while moving together with the road machine. Therefore, the heating surface of the heating device may be too far from the end surface (side surface) of the existing pavement.

In view of the above, it is desired to provide a road heating device capable of suppressing fluctuations in the distance between the heating unit and the end face of the existing pavement.

The road heating device according to the embodiment of the present invention is a road heating device that heats an existing pavement, and is attached to a main body portion, a heating portion attached to the main body portion, and attached to the main body portion. possess a follower to follow the heating portion at a fixed distance to the end face of the existing pavement, one or a plurality of wheels attached to said body portion, said follower has an end face of the existing pavement The end face contact portion is an end face contact portion, the end face contact portion is composed of a rolling element or a sliding body, and at least one of the one or a plurality of the wheels is the main body traveling along the end surface of the existing pavement. as the part is pressed against the end surface contact section on the end face of the existing pavement, that have oriented obliquely with respect to the traveling direction.

By the above-mentioned means, a road heating device capable of suppressing fluctuations in the distance between the heating portion and the end face of the existing pavement is provided.

It is the schematic of the asphalt finisher which pulls a heating device. It is a perspective view of a heating device. It is a rear view of the main body of a heating device. It is a schematic diagram of a heating device. It is a schematic diagram of a heating device.

FIG. 1 is a schematic view of an asphalt finisher 100 as a road machine for towing a heating device 50 according to an embodiment of the present invention. Specifically, FIG. 1A is a side view of the asphalt finisher 100, and FIG. 1B is a top view thereof. The thick arrow in the figure indicates the traveling direction of the asphalt finisher 100.

The asphalt finisher 100 is mainly composed of a tractor 1, a hopper 2, and a screed 3. In the following, the direction of the hopper 2 as seen from the tractor 1 (+ X direction) is the front, and the direction of the screed 3 as seen from the tractor 1 (−X direction) is the rear.

The tractor 1 is a mechanism for running the asphalt finisher 100. In this embodiment, the tractor 1 uses the rear wheel traveling motor to rotate the rear wheels 5, and uses the front wheel traveling motor to rotate the front wheels 6 to move the asphalt finisher 100. The rear wheelie motor and the front wheelie motor rotate by receiving the supply of hydraulic oil from the hydraulic pump. The rear wheels 5 and the front wheels 6 may be replaced by crawlers.

The hopper 2 is a mechanism for receiving the pavement material. In this embodiment, it is installed on the front side of the tractor 1 and can be opened and closed in the Y-axis direction (vehicle width direction) by a hopper cylinder. The asphalt finisher 100 usually receives the pavement material (for example, an asphalt mixture) from the loading platform of the dump truck with the hopper 2 fully open. FIG. 1 shows that the hopper 2 is in the fully open state. When the amount of pavement material in the hopper 2 decreases, the hopper 2 is closed, and the pavement material near the inner wall of the hopper 2 is collected in the central portion of the hopper 2. This is so that the convair CV in the central portion of the hopper 2 can supply the pavement material to the rear side of the tractor 1. Further, the pavement material fed to the rear side of the tractor 1 is spread in the vehicle width direction on the rear side of the tractor 1 and the front side of the screed 3 by the screw SC. In the example of FIG. 1, the screw SC is in a state where the extension screws are connected to the left and right.

The screed 3 is a mechanism for laying out the pavement material. In this embodiment, the screed 3 mainly includes a front screed 30 and a rear screed 31. Further, the screed 3 is a floating screed towed by the tractor 1 and is connected to the tractor 1 via the leveling arm 3A.

The front screed 30 includes a left front screed 30L and a right front screed 30R, and a rear screed 31 includes a left rear screed 31L and a right rear screed 31R. The left rear screed 31L and the right rear screed 31R are expanded and contracted in the vehicle width direction using a screed telescopic cylinder.

A side plate 40 is attached to the end of the screed 3. The side plate 40 limits the excessive spread of the pavement material spread by the screw SC in the vehicle width direction. In the example of FIG. 1, the side plate 40 includes a right side plate 40R extending forward from the right rear screed 31R and a left side plate 40L extending forward from the left rear screed 31L.

A traction member 60 for traction of the heating device 50 is attached to the side plate 40. In the example of FIG. 1, the traction member 60 is an L-shaped rod-shaped member made of an iron pipe, and is forward (+ X direction) from the front end (+ X side end) and the upper end (+ Z side end) of the right side plate 40R. It is attached so as to extend to. A wire 61 is attached to the tip (+ X side end) of the towing member 60. The lower end (−Z side end) of the wire 61 is attached to the tip end (+ X side end) of the heating device 50. The traction member 60 may be attached to the tractor 1. The heating device 50 may be configured to proceed by being pushed from behind by the asphalt finisher 100.

With this configuration, the asphalt finisher 100 can advance the heating device 50 arranged so as to straddle the boundary between the existing pavement AP and the roadbed RB along the boundary.

The heating device 50 heats the existing pavement AP. In the example of FIG. 1, the heating device 50 is a joint heater that heats the end portion of the existing pavement AP. FIG. 1 shows a state in which two heating devices 50F and 50R are connected. Three or more heating devices 50 may be connected or one.

Here, the details of the heating device 50 will be described with reference to FIGS. 2 and 3. FIG. 2 is a perspective view of the heating device 50 viewed from diagonally rear left. FIG. 3 is a rear view of the main body 51 of the heating device 50. The thick arrow in FIG. 2 indicates the traveling direction of the heating device 50. The following description applies to both the front heating device 50F and the rear heating device 50R.

The heating device 50 mainly includes a main body portion 51, an end face contact portion 52, a wheel height adjusting mechanism 53, wheels 54, a heat resistant sheet 55, and the like.

The main body 51 forms a combustion chamber for burning fuel. The fuel is a gaseous fuel such as propane gas, for example. It may be a liquid fuel. In this embodiment, the main body 51 has a combustion chamber surrounded by a metal plate. At the bottom of the combustion chamber, a heating unit that is heated by the combustion of fuel to generate heat is attached. The heating portion is configured as, for example, an L-shaped heating surface (surface heat source) in a rear view that matches the shape of the end portion of the existing pavement AP. The heating surface may have a shape inclined with respect to the horizontal plane so as to face both the end face AP1 and the surface AP2 of the existing pavement AP, or may have another shape such as a curved shape. .. The heating unit may be a linear heat source or a point heat source.

Alternatively, the main body 51 may be provided with a magnetron that generates microwaves as a heating unit, or may be provided with an electric heater such as an electromagnetic induction heating type heater or a resistance heating type heater.

The end face contact portion 52 is an example of a follow-up portion that is attached to the main body portion 51 and causes the heating portion to follow the end face AP1 of the existing pavement AP at a constant distance. The end face contact portion 52 is configured to be in contact with the end face AP1 of the existing pavement body AP. The end face contact portion 52 is, for example, a rolling element such as a wheel or a ball, or a sliding body having a cylindrical surface or a spherical surface at the tip end portion. In this embodiment, the end face contact portion 52 is a wheel made of a heat-resistant material (for example, metal), and has a front end face contact portion 52F attached to the front side (+ X side) of the main body portion 51 and a rear side (for example). Includes the rear end face contact portion 52B attached to the −X side). The rear end surface contact portion 52B is fastened to, for example, a metal plate stay 51a fixed to the back surface of the main body portion 51 via a bolt so that the position in the Y-axis direction can be adjusted. It may be configured so that the position (height) in the Z-axis direction can be adjusted. The same applies to the front end face contact portion 52F. In this embodiment, the rotation axis of the end face contact portion 52 is arranged so as to be parallel to the end face AP1 of the existing pavement AP. However, the rotation axis of the end face contact portion 52 may be inclined with respect to the end face AP1.

With this configuration, the end face contact portion 52 can prevent the heating portion of the main body portion 51 from being excessively close to the end face AP1 of the existing pavement AP. Further, the distance between the heating portion of the main body portion 51 and the end face AP1 of the existing pavement AP can be maintained constant.

The wheel height adjusting mechanism 53 is a mechanism for adjusting the height of the wheels 54. In this embodiment, two wheel height adjusting mechanisms 53 are attached to the front side of the main body 51, and two are attached to the rear side. Specifically, the left front adjustment mechanism 53FL corresponding to the left front wheel 54FL, the right front adjustment mechanism 53FR corresponding to the right front wheel 54FR, the left rear adjustment mechanism 53BL corresponding to the left rear wheel 54BL, and the right rear Includes a right rear adjustment mechanism 53BR corresponding to the side wheel 54BR.

More specifically, the left rear adjustment mechanism 53BL includes a side view L-shaped metal plate 53S. The metal plate 53S is fastened to the metal plate stay 51b fixed to the back surface of the main body 51 via bolts so that the position (height) in the Z-axis direction can be adjusted. The metal plate 53S is formed with a pair of elongated holes 53G for height adjustment extending in the Z-axis direction at the time of fastening. A plurality of pairs of round holes for height adjustment may be formed. The left rear wheel 54BL is fastened to the metal plate 53S via bolts so that the position in the Y-axis direction can be adjusted. Two pairs of round holes 53H for adjusting the position are formed in the metal plate 53S. Three or more pairs of round holes for position adjustment may be formed, and a pair of elongated holes for position adjustment may be formed. The same applies to the left front side adjusting mechanism 53FL, the right front side adjusting mechanism 53FR, and the right rear side adjusting mechanism 53BR.

A heat-resistant sheet 55 is attached to the lower part of the main body 51. The heat-resistant sheet 55 is a member for blocking the heating space between the heating portion of the main body 51 and the ground (for example, the roadbed RB, the surface AP2 of the existing pavement AP, etc.) from the external space. In this embodiment, the heat-resistant sheet 55 includes a left heat-resistant sheet 55L extending downward from the lower end of the left side surface of the main body 51, a right heat-resistant sheet 55R extending downward from the lower end of the right side surface of the main body 51, and a front side surface of the main body 51. Left front heat-resistant sheet 55FL (see FIG. 4) and right front heat-resistant sheet 55FR (see FIG. 4) extending downward from the lower end of the main body 51, and left rear heat-resistant sheet 55BL extending downward from the lower end of the rear side surface of the main body 51. And the right rear heat resistant sheet 55BR is included.

In this embodiment, the lower ends of the left heat-resistant sheet 55L, the left front heat-resistant sheet 55FL, and the left rear heat-resistant sheet 55BL are in contact with the surface of the roadbed RB. The lower ends of the right heat-resistant sheet 55R, the right front heat-resistant sheet 55FR, and the right rear heat-resistant sheet 55BR are in contact with the surface AP2 of the existing pavement AP. With this configuration, the heat-resistant sheet 55 can isolate the heating space from the external space and efficiently maintain the temperature in the heating space.

A scarifire 57 is attached to the rear end of the main body 51 via an urging portion 56. In this embodiment, the urging portion 56 and the scarifire 57 are attached only to the rear heating device 50R. This is so that the end face AP1 of the existing pavement AP can be scraped off in the most heated state. However, it may be additionally attached to the front heating device 50F.

The urging unit 56 urges the scarifire 57 toward the end face AP1 of the existing pavement AP. In this embodiment, the urging portion 56 is a leaf spring. A coil spring may be used.

The scarifire 57 is a member for scratching the end face AP1 of the existing pavement AP. In this embodiment, the scarifire 57 is made of a metal plate and has three claws. The scarifire 57 is pressed against the end face AP1 of the existing pavement AP by the urging portion 56.

When the scarifire 57 receives an outward (+ Y direction) force due to a protrusion or the like on the end face AP1 of the existing pavement AP, the urging portion 56 may release the scarifire 57 outward (+ Y direction). it can. As a result, the urging portion 56 can prevent an excessive force from acting on the scarifire 57. Therefore, damage to the scarifire 57 can be prevented.

The scarifire 57 is preferably arranged at the rear end of the main body 51 that travels along the end face AP1 of the existing pavement AP. This is so that the end face AP1 can be scratched when the end face AP1 becomes soft due to heating by the heating device 50. Therefore, the scarifire 57 is arranged, for example, in the vicinity of the left rear wheel 54BL attached to the rear side of the main body 51 traveling along the end surface AP1 of the existing pavement AP.

Further, the scarifire 57 is preferably arranged so as not to overlap with the heating portion in the longitudinal direction of the main body portion 51 extending along the end surface AP1 of the existing pavement body AP. For example, it is arranged outside the heating space defined by the heat resistant sheet 55. This is so that the heat-resistant sheet 55 can easily block the heating space from the external space.

With the above configuration, the scarifire 57 can scrape the end face AP1 of the existing pavement AP softened by heating by the heating device 50. Therefore, the adhesive force between the existing pavement AP and the new pavement is strengthened. This is because more pavement material in the existing pavement AP and more pavement material in the new pavement engage more deeply. As a result, the heating device 50 can form a joint portion in which the pavement material is appropriately meshed.

Next, with reference to FIG. 4, a configuration in which the main body 51 presses the end face contact portion 52 against the end face AP1 of the existing pavement AP will be described. 4A and 4B are schematic views of the heating device 50, FIG. 4A shows a front view of the heating device 50, and FIG. 4B shows a top view of the heating device 50.

As shown in FIG. 4, the four wheels 54 are fixed to the main body 51 so as to face diagonally with respect to the traveling direction of the main body 51, that is, so as to face diagonally with respect to the longitudinal direction of the main body 51. Has been done. The thick arrow in FIG. 4B indicates the traveling direction of the main body 51. Specifically, it is attached to the main body 51 so as to face the direction of the angle θ with respect to the traveling direction of the main body 51. The angle θ is appropriately set according to, for example, the traveling speed, the size of the wheel 54, the length of the heating device 50, and the like. The angle θ may be a different angle for each wheel, or may be a common angle for each wheel.

With this configuration, when the main body 51 advances along the end face AP1 of the existing pavement AP, the end face contact portion 52 (front end face contact portion 52F and rear end face contact portion 52B) is changed to the end face AP1 of the existing pavement AP. Can be pressed against. This is because the main body 51 tends to travel in the direction of the angle θ by the four wheels 54 facing the direction of the angle θ with respect to the traveling direction, that is, to approach the existing pavement AP side. Actually, the main body 51 moves forward (+ X direction) because the movement in the right direction (−Y direction) is restricted by the contact between the end face AP1 of the existing pavement AP and the end face contact portion 52.

Further, the main body 51 can move along the end face AP1 of the existing pavement AP. That is, the distance between the heating portion and the end face AP1 can be maintained constant. This is because the movement of the main body 51 to move away from the end face AP1 is offset by the movement of the main body 51 to move in the direction of the angle θ. Further, the movement of the main body 51 toward the end face AP1 is limited by the contact between the end face AP1 and the end face contact portion 52. Therefore, even if the asphalt finisher 100 meanders or the existing pavement AP is curved along a curve, the main body 51 can move along the end surface AP1 of the existing pavement AP.

In the above embodiment, all four wheels 54 are fixed to the main body 51 so as to face the direction of the angle θ with respect to the traveling direction of the main body 51. However, only a part of the four wheels 54 may be fixed to the main body 51 so as to face the direction of the angle θ. For example, the left front wheel 54FL and the right front wheel 54FR may be fixed so as to face the direction of the angle θ, and the left rear wheel 54BL and the right rear wheel 54BR may be fixed so as to face the traveling direction. Alternatively, the left front wheel 54FL and the left rear wheel 54BL may be fixed so as to face the direction of the angle θ, and the right front wheel 54FR and the right rear wheel 54BR may be fixed so as to face the traveling direction. Alternatively, the left front wheel 54FL may be fixed so as to face the direction of the angle θ, and the right front wheel 54FR, the left rear wheel 54BL, and the right rear wheel 54BR may be fixed so as to face the traveling direction.

The number of wheels 54 attached to the main body 51 may be three. In this case, for example, in addition to the right front wheel 54FR and the right rear wheel 54BR, the left wheel 54L may be attached to the center left side of the main body 51 in a top view. Then, all of the three wheels 54 may be fixed to the main body 51 so as to face the direction of the angle θ with respect to the traveling direction of the main body 51. Only the left wheel 54L may be fixed so as to face the direction of the angle θ with respect to the traveling direction of the main body 51, and the right front wheel 54FR and the right rear wheel 54BR may be fixed so as to face the traveling direction. Alternatively, the right front wheel 54FR and the right rear wheel 54BR may be fixed so as to face the direction of the angle θ with respect to the traveling direction of the main body 51, and the left wheel 54L may be fixed so as to face the traveling direction.

Alternatively, in addition to the left front wheel 54FL and the left rear wheel 54BL, the right wheel 54R may be attached to the center right side of the main body 51 in a top view. Then, all of the three wheels 54 may be fixed to the main body 51 so as to face the direction of the angle θ with respect to the traveling direction of the main body 51. Only the right wheel 54R may be fixed so as to face the direction of the angle θ with respect to the traveling direction of the main body 51, and the left front wheel 54FL and the left rear wheel 54BL may be fixed so as to face the traveling direction. Alternatively, the left front wheel 54FL and the left rear wheel 54BL may be fixed so as to face the direction of the angle θ with respect to the traveling direction of the main body 51, and the right wheel 54R may be fixed so as to face the traveling direction.

Alternatively, in addition to the left rear wheel 54BL and the right rear wheel 54BR, the front wheel 54F may be attached to the center front side of the main body 51 in a top view. Then, all of the three wheels 54 may be fixed to the main body 51 so as to face the direction of the angle θ with respect to the traveling direction of the main body 51. Only the front wheel 54F may be fixed so as to face the direction of the angle θ with respect to the traveling direction of the main body 51, and the left rear wheel 54BL and the right rear wheel 54BR may be fixed so as to face the traveling direction.

Alternatively, in addition to the left front wheel 54FL and the right front wheel 54FR, the rear wheel 54B may be attached to the center rear side of the main body 51 in a top view. Then, all of the three wheels 54 may be fixed to the main body 51 so as to face the direction of the angle θ with respect to the traveling direction of the main body 51. The left front wheel 54FL and the right front wheel 54FR may be fixed so as to face the direction of the angle θ with respect to the traveling direction of the main body 51, and only the rear wheel 54B may be fixed so as to face the traveling direction.

Further, the main body 51 may be suspended from the tip of an arm (not shown) extending from the asphalt finisher 100 so as to press the end face contact portion 52 against the end face AP1 of the existing pavement AP. In this case, the tip of the arm is positioned so as to be directly above a point on the surface AP2 of the existing pavement AP, for example. This is because the end face contact portion 52 is pressed against the end face AP1 of the existing pavement AP by the weight of the heating device 50. The wheels 54 may be omitted and may be one, two, three, or four or more.

With this configuration, the main body 51 sets the end face contact portion 52 on the existing pavement when traveling along the end face AP1 of the existing pavement AP, as in the case where the wheels 54 are fixed so as to face the direction of the angle θ. It can be pressed against the end face AP1 of the body AP. This is because the end face contact portion 52 tends to move in the direction of the end face AP1 due to the weight of the main body portion 51.

Further, the main body 51 can move along the end face AP1 of the existing pavement AP. That is, the distance between the heating portion and the end face AP1 can be maintained constant. This is because the movement of the main body 51 toward moving away from the end face AP1 is offset by the movement of the main body 51 due to its own weight. Further, the movement of the main body 51 toward the end face AP1 is limited by the contact between the end face AP1 and the end face contact portion 52. Therefore, even if the asphalt finisher 100 meanders or the existing pavement AP is curved along the curve, the main body 51 can move along the end surface AP1 of the existing pavement AP. ..

Next, another configuration example of the heating device 50 will be described with reference to FIG. FIG. 5 is a schematic view showing another configuration example of the heating device 50, and corresponds to FIG. Specifically, FIG. 5A shows a front view of the heating device 50, and FIG. 5B shows a top view of the heating device 50.

In the heating device 50 of FIG. 5, wheels 54 are attached to the front end (+ X side end) and the rear end (-X side end) of the main body 51 toward the right end (-Y side end) and to the left end (+ Y side end). It differs from the heating device 50 of FIG. 4 in that the end face contact portion 52 is attached. In the heating device 50 of FIG. 4, wheels 54 are attached to the left and right ends and an end face contact portion 52 is attached to the center at the front end and the rear end of the main body portion 51.

Therefore, in the heating device 50 of FIG. 5, all four wheels 54 move on the surface AP2 of the existing pavement AP. In the heating device 50 of FIG. 4, the left front wheel 54FL and the left rear wheel 54BL move on the surface of the roadbed RB, and the right front wheel 54FR and the right rear wheel 54BR move on the surface AP2 of the existing pavement AP. ..

Further, in the heating device 50 of FIG. 5, the left front wheel 54FL and the right front wheel 54FR are fixed so as to face the direction of the angle θ, and the left rear wheel 54BL and the right rear wheel 54BR are fixed so as to face the traveling direction. Has been done. All of the four wheels 54 may be fixed so as to face the direction of the angle θ, and one, two, or three of the four wheels 54 may be fixed so as to face the direction of the angle θ. May be good.

At the front and rear ends of the main body 51, the wheels 54 may be attached closer to the left end and the end face contact portion 52 may be attached to the right end. In this case, all four wheels 54 move on the surface of the roadbed RB.

With this configuration, the heating device 50 of FIG. 5 makes the end face contact portion 52 the end face of the existing pavement AP when traveling along the end face AP1 of the existing pavement AP, as in the case of the heating device 50 of FIG. It can be pressed against AP1. This is because the main body 51 tends to travel in the direction of the angle θ due to the wheels 54 facing the direction of the angle θ with respect to the traveling direction, that is, to approach the existing pavement AP side. Actually, the main body 51 moves forward (+ X direction) because the movement in the right direction (−Y direction) is restricted by the contact between the end face AP1 of the existing pavement AP and the end face contact portion 52.

As described above, the heating device 50 for heating the existing pavement AP has a main body 51 and an end face contact portion 52 attached to the main body 51 and in contact with the end face AP1 of the existing pavement AP. Therefore, the fluctuation of the distance between the heating portion and the end face AP1 of the existing pavement AP can be suppressed. For example, it is possible to prevent the distance between the heating portion and the end face AP1 of the existing pavement AP from becoming excessively small.

The end face contact portion 52 is preferably composed of a heat-resistant rolling element or a heat-resistant sliding body. Therefore, it is possible to suppress an increase in the frictional force generated between the end face contact portion 52 and the end face AP1 of the existing pavement body AP, and it is possible to suppress or prevent the progress of the heating device 50 from being hindered by the frictional force. ..

The main body 51 is configured to press the end face contact portion 52 against the end face AP1 of the existing pavement AP when traveling along the end face AP1 of the existing pavement AP. For example, the wheel 54 is attached to the main body 51 so as to face obliquely with respect to the traveling direction. Alternatively, the main body 51 may be suspended so as to press the end face contact portion 52 against the end face AP1 of the existing pavement AP. Specifically, it may be hung from the tip of an arm extending from the asphalt finisher 100. Therefore, the fluctuation of the distance between the heating portion and the end face AP1 of the existing pavement AP can be further suppressed. For example, the distance between the heating portion and the end face AP1 of the existing pavement AP can be maintained constant.

The heating device 50 may have a scarifire 57 that is attached to the main body 51 and scratches the end face AP1 of the existing pavement AP. The scarifire 57 can scrape the end face AP1 of the existing pavement AP softened by heating by the heating device 50. Therefore, the adhesive force between the existing pavement AP and the new pavement can be strengthened. As a result, the heating device 50 can form a joint portion in which the pavement material is appropriately meshed.

The scarifire 57 is preferably arranged at the rear end of the main body 51 that travels along the end face AP1 of the existing pavement AP. For example, it is arranged in the vicinity of the wheel 54 attached to the rear side of the main body 51. This is so that the end face AP1 of the existing pavement AP can be scraped off in the most heated state.

The scarifire 57 is preferably arranged so as not to overlap the heating portion in the longitudinal direction of the main body portion 51 extending along the end face AP1 of the existing pavement AP. This is so that the heat-resistant sheet 55 can easily block the heating space.

The heating device 50 may have an urging portion 56 that is attached to the main body portion 51 and urges the scarifire 57 toward the end face AP1 of the existing pavement AP. This is to more reliably press the scarifire 57 against the end face AP1 of the existing pavement AP. Further, when the scarifire 57 receives an outward force (+ Y direction) due to a protrusion or the like on the end surface AP1 of the existing pavement AP, the urging portion 56 releases the scarifire 57 outward (+ Y direction). be able to. As a result, the urging portion 56 can prevent an excessive force from acting on the scarifire 57. Therefore, damage to the scarifire 57 can be prevented.

The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the examples described above. Various modifications, substitutions, etc. can be applied to the above-described examples without departing from the scope of the present invention.

For example, in the above-described embodiment, the heating device 50 uses the end face contact portion 52 as a follow-up portion to make the heating portion follow the end face AP1 of the existing pavement AP at a constant distance. However, the present invention is not limited to this configuration. The following portion may have, for example, a configuration that actively controls the angle θ of the wheel 54 (for example, a mechanism that dynamically changes the mounting angle θ of the wheel 54). In this case, the tracking unit measures the distance between the end face AP1 and the heating unit with a distance measuring unit such as an ultrasonic sensor, millimeter wave radar, laser radar, or camera, and dynamically changes the angle θ based on the measurement result. You may let me.

1 ... Tractor 2 ... Hopper 3 ... Screed 3A ... Leveling arm 5 ... Rear wheel 6 ... Front wheel 30 ... Front screed 31 ... Rear screed 40 ... Side Plates 50, 50F, 50R ... Heating device 51 ... Main body 51a, 51b ... Metal plate stay 52 ... End face contact 53 ... Wheel height adjustment mechanism 53G ... Long hole 53H ...・ ・ Round hole 53S ・ ・ ・ Metal plate 54 ・ ・ ・ Wheel 55 ・ ・ ・ Heat resistant sheet 56 ・ ・ ・ Basis part 57 ・ ・ ・ Scarifier 60 ・ ・ ・ Tractor member 61 ・ ・ ・ Wire 100 ・ ・ ・ Asphalt Finisher AP ・ ・ ・ Existing pavement AP1 ・ ・ ・ End face AP2 ・ ・ ・ Surface CV ・ ・ ・ Conveyor RB ・ ・ ・ Roadbed SC ・ ・ ・ Screw

Claims (9)

A road heating device that heats existing pavements.
With the main body
The heating unit attached to the main body and
A follow-up portion that is attached to the main body portion and that allows the heating portion to follow the end face of the existing pavement at a constant distance.
Have a one or a plurality of wheels attached to said body portion,
The following portion is an end face contact portion that is in contact with the end face of the existing pavement.
The end face contact portion is composed of a rolling element or a sliding body.
At least one of the wheels is oriented obliquely with respect to the traveling direction so that the main body portion traveling along the end face of the existing pavement presses the end face contact portion against the end surface of the existing pavement. ing,
Road heating device. When the main body portion advances along the end face of the existing pavement, the main body portion is configured to press the end face contact portion against the end face of the existing pavement.
The road heating device according to claim 1. The main body portion that travels along the end face of the existing pavement is suspended so as to press the end face contact portion against the end face of the existing pavement.
The road heating device according to claim 1 or 2. It has a scarifire that is attached to the main body and scratches the end face of the existing pavement.
The road heating device according to any one of claims 1 to 3. A road heating device that heats existing pavements.
With the main body
The heating unit attached to the main body and
A follow-up portion that is attached to the main body portion and that allows the heating portion to follow the end face of the existing pavement at a constant distance.
It has a scarifire that is attached to the main body and scratches the end face of the existing pavement .
Road heating device. The scarifire is arranged at the rear end of the main body portion that travels along the end face of the existing pavement.
The road heating device according to claim 5. The scarifire is arranged so as not to overlap with the heating portion in the longitudinal direction of the main body portion extending along the end face of the existing pavement.
The road heating device according to claim 5 or 6. The scarifire is arranged in the vicinity of wheels attached to the rear side of the main body portion that travels along the end face of the existing pavement.
The road heating device according to any one of claims 5 to 7. It has an urging portion that is attached to the main body portion and urges the scarifire toward the end face of the existing pavement.
The road heating device according to any one of claims 5 to 8.

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