JP4064544B2 - Road pavement layer cutting method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a road pavement layer cutting method suitable for cutting a road pavement layer around a manhole cover when adjusting the height of a manhole cover installed on a road pavement surface.
[0002]
[Prior art]
The manhole cover installed on the road pavement surface due to road construction or the like has a step difference with respect to the road surface, and therefore manhole cover cover height adjustment work is frequently performed.
In this manhole cover height adjustment work, the road pavement layer around the manhole cover is cut, the cut pavement layer is removed, and the movable manhole cover frame is adjusted up and down by predetermined cover height adjustment means. After that, the restoration work is performed so that the periphery of the manhole cover frame whose height is adjusted is re-paved.
[0003]
Here, when cutting the pavement layer around the manhole cover, the road pavement layer around the manhole cover is usually changed from a point to b point and from b point to c as shown in FIG. A point is cut linearly from point c to point d and from point d to the first point a.
In this case, since the road pavement layer has the required pavement thickness, it is necessary to cut into the road pavement layer by crossing disc cutters at points a, b, c, and d that become corners. Thus, extra pavement cuts called extra cuts are generated at points a, b, c, and d at the corners.
[0004]
[Problems to be solved by the invention]
By the way, when the above-mentioned surplus cut occurs, the temporary restoration work is performed after the height adjustment work of the manhole cover. Then, when recovering the pavement around the lid frame at a later date, an enlarged range including the extra cut portion (shown by a one-dot chain line in FIG. 7) so that the extra cut portion does not adversely affect the existing pavement portion. When the restoration work such as rolling down the roadbed and re-paving after removing the crushed pavement material and removing the crushed pavement material, it is important for road management to restore the entire expansion range as described above. For this reason, there are inconveniences such as a large amount of materials for restoration and a long construction time for restoration and high costs.
[0005]
Conventionally, as a construction example in which the above-described surplus cutting does not occur, a method of cutting a road pavement surface into a circular shape as described in Japanese Patent Publication No. 61-25844 has been proposed. A special cutter for cutting the road surface into a circular shape and equipment with a special circular cutting mechanism are necessary, and the implementation costs are high and special techniques are also required for construction. was there.
[0006]
In addition, there are various types of manholes installed on the road pavement, such as for gas pipes, sewage pipes, and communication cable pipes, and there are various manhole cover shapes and sizes.
If the height of the rectangular manhole cover is 1140 mm wide and 940 mm long, a circular cutter with an inner diameter of 1700 mm or more is required. In this case, the manufacturing cost of this circular cutter is high. This introduces the problem of increasing the burden of loading and unloading equipment.
In addition, a circular cutter that matches the shape and size of the manhole cover must be prepared, resulting in a problem of high construction costs.
[0007]
The object of the present invention was devised to solve these problems, and an object of the present invention is to provide a method for cutting a road pavement layer that can handle any manhole cover size and shape. .
[0008]
[Means for Solving the Problems]
In order to achieve this object, the present invention provides a road pavement layer cutting method for cutting a road pavement layer around a manhole cover that is exposed on the road surface. In the first step, the manhole cover is removed. A plurality of circular holes having a required diameter are formed in the surrounding road pavement layer at an arrangement interval surrounding the manhole cover, and in the second step, adjacent circular holes are formed with respect to the plurality of circular holes. The road pavement layer surrounding the periphery of the manhole cover is cut in a straight line so as to connect the facing portions in a straight line.
[0009]
Further, the present invention is characterized in that, in the first step, when the manhole cover has a quadrangular shape, the plurality of circular holes are formed at four positions on the diagonal line of the quadrangular manhole cover.
[0010]
Further, the present invention is characterized in that, in the first step, the circular hole has an inner diameter dimension substantially the same as a dimension corresponding to a pavement thickness of a road pavement layer.
[0012]
Further, the present invention provides a road pavement layer cutting method for cutting a road pavement layer around a manhole cover that is exposed and installed on the road surface. In the first step, the road pavement layer around the manhole cover is provided with the manhole. The second step is characterized in that a circular hole having a required diameter is formed so as to be at least in contact with the linear cutting lines adjacent to each other.
[0013]
[Action]
In the present invention, in the first step, a plurality of circular holes having a required diameter are formed with an array interval surrounding the manhole cover. For example, when the manhole cover has a quadrangular shape, the plurality of circular holes are formed at four positions on the diagonal line of the quadrangular manhole cover. Next, in a second step, the road pavement layer surrounding the periphery of the manhole cover is cut linearly so as to linearly connect the opposing circular holes to the plurality of circular holes. By doing in this way, the road pavement layer around a manhole cover can be cut appropriately regardless of the size and shape of any manhole cover.
[0014]
Moreover, in this invention, a circular hole can be set to the internal diameter dimension substantially the same as the dimension corresponding to the pavement thickness of a road pavement layer . According to this , the circular hole has a relatively small diameter. Therefore, when a circular cutter is used for forming the circular hole, the circular cutter may be small, so that the construction equipment can be downsized and the construction equipment can be easily transported.
[0015]
When cutting the road pavement layer between the outer tangential circular hole of the each other in the second step, the cutting shape is accompanied by appearance to the cutting shape becomes substantially rectangular, and further, also stable road surface strength when restored.
[0016]
In the present invention, in the first step, the road pavement layer around the manhole cover is cut linearly so as to surround the manhole cover and not cross. That is, the periphery of the manhole cover is cut into a square shape with no corners. Next, in the second step, a circular hole having a required diameter is formed so as to be at least in contact with the linear cutting lines adjacent to each other. By doing in this way, the road pavement layer around a manhole cover can be cut appropriately regardless of the size and shape of any manhole cover.
[0017]
【Example】
FIG. 1 is a plan view of a manhole cover 1 disposed on a road surface. As preparation for adjusting the height of the manhole cover 1, it is necessary to first remove the asphalt around the manhole cover 1.
In the present embodiment, the shape of the manhole cover is described as a quadrangular shape, but the method of the present invention can also be applied to a circular manhole cover.
[0018]
First, as a first embodiment, as shown in FIG. 2, circular holes 2 are formed at four locations on the diagonal of the manhole cover 1, that is, at the four corners of the manhole cover 1 as a first step.
As the size of the circular hole 2, when the diameter of the asphalt is approximately the same, for example, when the asphalt has a thickness of 20 cm, a circular hole having a diameter of 20 cm is formed. But you can.
[0019]
The circular hole 2 is formed using a circular cutter 3.
As shown in FIG. 3, the circular cutter 3 has a support column 32 in which a feed such as a rack is formed on a pedestal 31, and an operating member 34 including a motor 33 moves the support column 32 up and down. . A cylindrical cutter 35 is detachably attached to the operating member 34.
An uneven cutter blade 35 a is formed at the lower end of the cutter 35, and is configured to cut the asphalt into a circular shape by pressing the asphalt while rotating the cutter 35.
[0020]
Next, as a second step, the asphalt that surrounds the periphery of the manhole cover 1 is cut linearly so as to connect the adjacent circular holes 2 in a straight line.
As a cutting means, a normal disk cutter or the like is used, and asphalt between the outer tangent directions of the circular holes 2 is cut as shown in FIG. By doing so, the cut shape becomes a substantially rectangular shape, and the cut shape comes with an aesthetic appearance.
[0021]
Then, after completion of the second step, the asphalt in the shaded portion shown in FIG. 4 is eliminated, and construction such as adjustment of the lid height of the manhole cover is performed. After the construction is completed, the asphalt material is dropped on the shaded portion, and the restoration work is performed by rolling with a blade or the like. Here, since the cut shape is substantially rectangular, the road surface strength when it becomes widespread becomes stable.
[0022]
As a second embodiment, as shown in FIG. 5, the asphalt around the manhole cover 1 is cut linearly so as to surround the manhole cover 1 and not intersect with it in the first step. That is, the periphery of the manhole cover 1 is cut into a square shape with no corners.
Next, in the second step, as shown in FIG. 6, a circular hole 2 having a required diameter is formed so as to be in contact with the linear cutting lines adjacent to each other.
By doing so, the asphalt around the manhole cover can be cut appropriately regardless of the size and shape of any manhole cover.
[0023]
【The invention's effect】
As described above, according to the present invention, the road pavement layer around the manhole cover can be appropriately cut regardless of the size and shape of any manhole cover.
[0024]
Further , according to the present invention, since the circular hole is set to have an inner diameter dimension substantially the same as the dimension corresponding to the pavement thickness of the road pavement layer, the circular hole has a relatively small diameter. Therefore, when a circular cutter is used for forming the circular hole, the circular cutter may be small, so that the construction equipment can be downsized, and the construction equipment can be easily transported.
[0025]
By cutting the road pavement layer between the outer tangent directions of the circular holes in the second step, the cut shape becomes substantially rectangular, and the cut shape is accompanied with aesthetics, and the road surface strength when restored is also stabilized.
[Brief description of the drawings]
FIG. 1 is an installation diagram of a manhole cover. FIG. 2 is an explanatory diagram of a first process in the first embodiment. FIG. 3 is an explanatory diagram of a circular cutter in the first embodiment. FIG.
FIG. 5 is an explanatory diagram of a first step in the second embodiment.
FIG. 6 is an explanatory diagram of a second step in the second embodiment.
FIG. 7 is an explanatory diagram of a conventional example.
[Explanation of symbols]
1 Manhole cover 2 Circular hole 3 Circular cutter

Claims (4)

In the cutting method of the road pavement layer that cuts the road pavement layer around the manhole cover that is installed exposed on the road surface,
In the first step, a plurality of circular holes having a required diameter are formed with an arrangement interval surrounding the manhole cover, with respect to the surrounding road pavement layer surrounding the manhole cover,
In the second step, for the plurality of circular holes, a road pavement layer surrounding the manhole cover is cut linearly so as to linearly connect opposite circular holes. Cutting method of road pavement layer.   2. The road pavement according to claim 1, wherein, in the first step, when the manhole cover has a quadrangular shape, the plurality of circular holes are formed at four locations on a diagonal line of the quadrangular manhole cover. 3. Layer cutting method.   3. The road pavement layer cutting method according to claim 1, wherein, in the first step, the circular hole is set to have an inner diameter dimension substantially the same as a dimension corresponding to a pavement thickness of the road pavement layer. . In the cutting method of the road pavement layer that cuts the road pavement layer around the manhole cover that is installed exposed on the road surface,
In the first step, the road pavement layer around the manhole cover is cut linearly so as to surround and not intersect the manhole cover,
In the second step, a road pavement layer cutting method, wherein a circular hole having a required diameter is formed so as to be in contact with at least the linear cutting lines adjacent to each other.

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