JPH083919A - Road planer - Google Patents

Abstract

PURPOSE:To turn the cut end of a paved surface to a coarse slope surface and enhance the consolidation of new and old pavement materials by fixing a group of bits so that the elevation of a bit at the tip may be increased gradually at the central part from a lateral end of a drum and fixing the remaining bits with a spot slightly deviated to the central part so that they may reach the maximum height. CONSTITUTION:A road planer A is halted at a cutting starting position of a road surface where a drum 1 is lowered to the road surface while the drum 1 is being driven rotatively. Bits 4 at the central part of the drum 1 are placed into contact with the road surface at first and then cutting is started. Then, the road surface is cut down while the bits 4 close to the lateral side of the drum 1 are placed into contact with the road surface one after another, thereby widening a cutting width gradually and forming a slope at the cutting end. After the drum 1 is lowered to a specified depth of the paved area of the road surface, the road planer is moved forward slowly so that a pavement material is planed with the bits 4 in a continuous mode so operated as to push out the scraped scraps of the pavement material together with a scraping plate 5 in the advancing direction, thereby proceeding with cutting work of the road surface. This construction makes it possible to turn the cutting end into a slope and cut the road surface with the bits 4 so as to produce a coarse surface and enhance the consolidation at the joint area with a new paved road surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road planer for scraping off a surface layer portion such as a road or a plaza, and in particular, a drum type rotary cutting capable of cutting a surface layer such as a damaged road surface to a depth suitable for re-paving. The present invention relates to a road planar equipped with a device.

[0002]

2. Description of the Related Art When an asphalt pavement such as a road is damaged or deformed, only the surface is usually repaved and used when the roadbed is not destroyed. For such re-paving, the road planer is used to scrape the pavement surface by, for example, about 5 cm to form a substantially flat road surface, spread the asphalt pavement material, etc., and then roll it flat with a tire roller. Repair was being carried out.

However, such a method does not cause any particular problem when the road surface is completely repaired, but when the construction is carried out only on a part of the lane of the road surface of the vehicle, the old pavement that has not been scraped off is used. Since the boundary surface between the surface portion and the repaved surface portion provided after shaving is vertical, the rolling pressure of the repaved portion near the boundary tends to be insufficient,
In addition to leaving a gap on the boundary surface or creating a step on the road surface to hinder the running of the vehicle, it is easy for rainwater to accumulate and penetrate, and not only impact force is applied to the paved road surface but also it is eroded. There were problems such as shortening the life of pavement.

Under these circumstances, in order to improve the joining of the boundary portion between the old pavement surface and the re-pavement surface, the cutting edge of the old pavement surface is cut so as to be a forward slope with respect to the road surface. A method was considered. However, it is inefficient to perform such cutting work manually, and it is difficult to satisfy both work efficiency and accuracy of cutting shape at the same time even when trying to cut into a slope shape with a paving surface cutter equipped with a rotary grinding disk. And
Moreover, a device with durability suitable for civil engineering work has not yet been developed.

[0005]

Therefore, the present invention is an improvement capable of cutting the cutting end of the old paved surface into a slope shape suitable for forming a dense joint structure at the boundary with the repaved surface. Aimed to provide a road planer that was made.

[0006]

The object of the present invention is as follows.
In a load planer comprising a rotary cutting device having a plurality of bits fixed on a bit mounting base provided along a cylindrical surface of a drum body whose rotation axis is substantially parallel to the ground, from a side end of the drum body. The group of bits is fixed so that the height of the bit tip increases sequentially toward the center, and the remaining bits of the group of bits have the same level as the maximum height of the group of bits. This can be achieved by fixing the bit at a fixed position and then at a position closer to the center.

Further, a group of bits fixed in such a manner that the height of the bit tip gradually increases toward the central portion of the drum body is provided even at one end portion of one side of the drum body. However, it may be provided substantially symmetrically at both ends of the drum body.

In the rotary cutting device mounted on the load planer of the present invention, the bit is fixed on the bit mounting base provided along the cylindrical surface of the drum body in the above-described specific posture. The rotation shaft is configured to be movable in the direction perpendicular to the road surface while maintaining the state of being substantially parallel to the road surface.

[0009]

When a road surface is cut by such a load planer of the present invention, when the drum of the rotary cutting device is brought closer to the road surface while rotating, the bit fixed to the central part of the rotary cutting device first cuts the road surface. Cut to almost flat. Then, as the cutting progresses, the width of the cut portion gradually becomes wider, and at the same time, the cutting depth of the central portion also becomes deeper, so that both end portions are cut in a slope shape.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a rotary cutting device mounted on a road planar according to the present invention will be described below with reference to FIGS. On the outer surface of the drum body 1 of the rotary cutting device A, a bit mounting base 2 is provided in a spiral shape along the cylindrical surface thereof, and a plurality of mounting seats 3 are provided on the outer surface of the bit mounting base 2 at appropriate intervals by welding or the like. It is fixed. Bit 4 is for mounting seat 3
It is inserted and fixed in the mounting hole provided in the so as to face the rotation direction of the drum body 1 so as not to fall off during the cutting work. Also, 5 is an adjacent bit mount 2
It is a scrap scraping plate attached to the position between
In order to prevent the scraps of the paving material and the like scraped by the bit 4 from accumulating between the bit mounts 2, the drum body 1 has a function of scraping the scraps of the paving material by rotation.

The bit mounting base 2a provided at the end of the drum body 1 is formed in an annular shape surrounding the end, and is mounted on the mounting base 3a, 3b ,. The bits 4a, 4b, 4c, ... Are attached such that the tips of the bits 4a, 4b, 4c, ... Further, such a mounting method of the bit 4 is continued to the spiral bit mounting base 2 provided by branching from the annular bit mounting base 2a, and the height of the tip of the bit 4 is a predetermined value. After reaching (for example, 10 cm from the surface of the bit mount 2), the bits 4 are fixed so that they all have the same height.
Therefore, the height of the bit 4 attached to the portion of the drum body 1 excluding both ends thereof is substantially the same level.

Such a rotary cutting device A has a drum body 1
The shaft 1a is rotatably supported by a vertically movable bearing, and is equipped with a drive mechanism for rotating the drum body 1. The shaft 1a is located in the middle of the front and rear axles for moving the load planar with respect to the ground. It is mounted in a suspended posture so as to be substantially parallel. And the drum body 1 can be rotationally driven regardless of whether the road planar is moving or stopped.
Further, it is provided so as to be movable up and down so that it can approach or separate from the road surface. Further, the rotation direction of the drum body 1 is set so as to push the bit 4 in contact with the road surface in the same direction as the traveling direction of the load planar, and the tip end of the bit 4 on the drum body 1 faces the rotation direction of the drum body 1. It is fixed so.

When the road surface is cut by using the road planer of the present invention as described above, for example, the load planer is stopped at the cutting start position of the road surface and the drum body 1 is cut.
While driving to rotate, lower it toward the road surface. Then, the bit 4 fixed to the central portion of the drum body 1 first comes into contact with the road surface to start cutting, but the road surface is scraped down and the bit 4 fixed to the side end of the drum body 1 is sequentially moved. As it comes into contact with the road surface, the cutting width gradually widens, and at the same time, slopes are formed at both ends of the cut road surface. In this way, when the road planer is slowly advanced after the drum body 1 is lowered to the position where the pavement portion of the road surface is scraped at a predetermined depth, the bit 4 continuously scrapes the pavement material of the road surface to a predetermined depth, and By working together with the scraping plate 5 to push out the shavings of the pavement material in the traveling direction, the road surface cutting operation is advanced.

Thus, the road surface portion cut by the road planer of the present invention has a sectional shape as shown in FIG. 3, and the end portion S of the cut portion of the old pavement surface P has a slope shape and is scraped off by the bit 4. It is a rough surface. Therefore, when re-paving, it is easy to lay new paving material on the cutting part, and the density of the paving material is increased because the rolling effect is increased, and the old pavement part and the new pavement part are effectively joined. Be sure to integrate.

[0015]

EFFECTS OF THE INVENTION The road surface portion cut by the road planer of the present invention has a sloping end and a rough surface, so that a new paving material used for re-paving can be effectively rolled. The adhesion between old and new paving materials is good,
Not only the automation of the paving work by a machine is facilitated, but also the safety of the work can be achieved, and the occurrence of defects on the paving surface can be eliminated.

[Brief description of drawings]

FIG. 1 is an external perspective view of a main part of a rotary cutting device A in a road planar according to the present invention.

FIG. 2 is an external view showing a structure in which a part of an end portion of a rotary cutting device A in a road planar according to the present invention is cut away.

FIG. 3 is a cross-sectional view showing the shape of a road surface cut by the road planer of the present invention.

[Explanation of symbols]

 1 Drum body 1a Shaft 2 Bit mounting base 2a Bit mounting base (end) 3 Mounting seats 3a, 3b, ... Mounting seat (end) 4 bits 4a, 4b, 4c, ... Bit (end) 5 Cutting waste Scraping plate A Rotary cutting device P Old pavement surface S Edge of cutting part

Claims (2)

[Claims] 1. A road planer comprising a rotary cutting device having a plurality of bits fixed on a bit mounting base provided along a cylindrical surface of a drum body whose rotation axis is substantially parallel to the ground. A group of bits is fixed so that the height of the bit tip increases sequentially from the side edge of the body toward the center, and the remaining bits have the same level as the maximum height of the group of bits. A load planer characterized in that it is fixed to a position near the center following the fixed position of the group of bits. 2. The group of bits fixed so that the height of the bit tip increases sequentially toward the center of the drum body is provided substantially symmetrically on both side ends of the drum body. 1. The road planar according to 1.