JPH09158114A - Cutting device used for manhole iron cover maintaining repairing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an increased life for a manhole by a method wherein deformation hardly occurs to a roadbed surface after a repair work. SOLUTION: A cutting blade 11 to rotate around the center of a manhole is provided and the cutting blade is provided with a rotary cylinder 12 for cutting a circle and a blade-form annular blade 14. A road layer part cut by an annular cutting tool 11 in such a manner that the cut peripheral surface of a road layer containing an iron cover support frame forms a slope is pulled off together with the iron cover support frame. An annular space after the road layer part is pulled off is paved by a new pavement part together with a new iron cover support frame. A cut peripheral surface forms a conical surface and an uneven curve surface, and a work to integrally build a new pavement part and an existing pavement part through a wedge effect is practicable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device used in a method for maintaining and repairing a manhole iron lid. More specifically, the present invention relates to a cutting device used in a method of maintaining and repairing a manhole iron lid that can prevent deformation of a roadbed surface after construction.

[0002]

[Prior Art] On a paved road surface nationwide, a manhole iron cover (hereinafter,
It is called a manhole). Manhole
It is a facility that allows people to enter and leave the horizontal holes that are laid for water, sewage, communications, and electricity. The manhole is composed of a circular hole wall opened from the road surface, an iron lid receiving frame for reinforcing the periphery of the hole wall, an iron lid fitted into the iron lid receiving frame, and a concrete ring for reinforcing the whole. ing. A manhole that is exposed to wind and rain and tons of trucks pass over the upper surface is distorted due to strain and deterioration of material strength. Manholes are replaced and repaired periodically according to the aging period.

The Epo method (registered trademark, Japanese Examined Patent Publication No. 63-55562, etc.) is known and famous as a cutting device used in the human hole iron lid maintenance repair method. This method is a cylindrical circular cutter that rotates around a support shaft located at the center of the manhole. As shown in FIG. 11, the asphalt around the human hole 01 is cut into a circle, and the asphalt is shown in FIG. Assemble with the asphalt disc 02 and the iron lid frame 03
It is equipped with a removal process of removing the product by the pulling tool 04 and lifting it up. Following this removal process, the asphalt disc will be replaced and a new iron lid frame and iron lid will be installed to complete the repair / replacement work.

Such restoration work is inexpensive and can be completed within 3 hours even if the curing time of the epoxy resin concrete called ES concrete used for the restoration work is put in, and the traffic is released. It is known to be an excellent construction method, including the short time to

[0005]

[Problems to be Solved by the Invention] Since a large truck exerts a large pressure on the upper surface of the manhole in a roadbed subjected to the EPO method, in which a new disc body is fitted to the roadbed that is partially cut into a disk shape, It has become known that the roadbed is deformed at the edge and the roadbed surface is displaced.

The present invention has been made based on such a technical background, and achieves the following objects.

An object of the present invention is to provide a cutting device used in a method for maintaining and repairing a manhole iron lid, in which the roadbed surface is less likely to be deformed.

Another object of the present invention is to provide a cutting device used in a manhole iron lid maintenance repair method capable of extending the life of a manhole after construction.

[0009]

Means for Solving the Problems To solve the above-mentioned problems, the following means are adopted.

The cutting device used for the manhole iron lid maintenance repair method of the present invention 1 is a manhole iron lid maintenance repair method for cutting the surrounding old road layer including the iron lid frame into a donut shape and replacing it with a new road layer. The cutting device to be used is characterized by including a cutting means having a cutting blade for forming a cutting peripheral surface into an inclined surface, and a driving means for rotating the cutting blade around the central axis of the manhole.

The cutting device used in the human hole iron lid maintaining and repairing method of the second aspect of the present invention is the cutting device used in the human hole iron lid maintaining and repairing method of the first aspect of the invention, wherein the cutting device has a cutting function portion on the lower end surface side. And a peripheral bevel forming blade that is attached to the peripheral surface of the rotor and that is cut by rotation to form a cutting peripheral surface that is an inclined surface.

[0012] The cutting device used in the human hole iron lid maintaining and repairing method of the third aspect of the present invention is the cutting device used in the human hole iron lid maintaining and repairing method of the second aspect of the present invention, which comprises drive means for supporting and driving the rotating body. And a flexible skirt which is supported by the driving means and circularly covers the ground of the road layer on which the manhole is provided.

The cutting device used in the method for maintaining and repairing the manhole iron lid according to the present invention 4 is the cutting device used in the method for maintaining and repairing the manhole iron cover in accordance with the invention 3, and has a circular shape that is in close contact with the ground at the lower end of the skirt. It is characterized in that it consists of a close contact band.

The cutting device used in the human hole iron lid maintaining and repairing method of the present invention 5 is the cutting device used in the human hole iron lid maintaining and repairing method of one invention selected from the above inventions 2 to 4. The slope forming blade is characterized by being attachable to and detachable from the rotating body.

The cutting device used in the manhole iron lid maintenance repair method of the present invention 6 is the cutting device used in the manhole iron lid maintenance repair method of one invention selected from the above inventions 1 to 4. It is characterized in that centering means for positioning and supporting the rotating shaft sharing the center line of the body at the center line of the manhole is provided at the center of the iron lid.

The road layer repaired by the cutting device used for the human hole iron lid maintenance repair method of the present invention is capable of forming a circumferential slope, and the new pavement part and the old pavement part are provided through the sloped surface. Overlapping. When downward pressure is applied to the new pavement portion that is the upper layer, the upper layer and the lower layer that is the old pavement portion are wedged together. By such a tightening force, the integration of both layers is promoted, and both layers are unlikely to slip. The cutting tool forming the cutting peripheral surface is composed of a cylindrical tool and a plurality of blade-shaped cemented carbide welding parts mounted on the peripheral surface of the tool. When the circular cutting is performed after the circular cutting, the cutting is easy and the burden on the blade is reduced.

[0017]

Next, an embodiment of the present invention will be described. FIG. 1 is a cross-sectional view showing a first embodiment of a cutting device used for a human hole iron lid maintenance repair method of the present invention, showing a relationship between a paved road 1 and a manhole 2. Paved road 1
As, the asphalt paved road is shown. The paved road 1 is provided with a roadbed on a roadbed 1a which is a lower layer. The roadbed is an intermediate layer containing gravel, and is formed from a lower layer roadbed 1b and an upper layer roadbed 1c.

A base layer 1d is formed on the upper surface of the roadbed.
A wear layer 1e is formed on the upper surface of the base layer 1d. The pavement is constructed by combining the roadbed, the intermediate layer, and the base layer. Since there is no essential relationship between the structure of such an asphalt pavement and the present invention, the terms roadbed, intermediate layer, base layer, etc. will not be used strictly below. In this specification, all or part of all layers are simply referred to as a roadbed or a road layer.

The manhole 2 is composed of a hole 3, an inclined wall 4 of a manhole for shaping the inner surface of the hole 3 to protect the hole, an adjusting member 5 for height adjustment, an iron lid receiving frame 6 and an iron lid 7. ing. Conditioner 5 is made of annular precast concrete,
Adjust the height of the iron lid receiving frame. FIG. 1 shows a preparation process for cutting a road layer. Conventionally, the road layer cutting process is called a circular cutting process because the groove is formed in a circular shape.

Since the cutting device used in the method for maintaining and repairing a manhole iron cover of the present invention forms an annular groove having a radial spread instead of a circular groove, in this specification, a more general annular cutting step will be described. Called separately. The cutting tool 11 used in the annular cutting step is conceptually shown in FIG. Cutting tool 11
Has a cylindrical tool body 12. On the cylindrical tool body 12, a cutting blade 13 containing diamond is planted on its ring-shaped lower end surface. When the annular cutting process is divided into a circular cutting process and an annular cutting process for forming a slope, the cutting tool 13 omitted is also used.

The cutting tool 11 includes a plurality of blade-shaped cutting blades 14.
It has. The plural blade-shaped cutting blades 14 are attached to the cylindrical tool body 12 at equal intervals of 120 degrees. The wing-shaped cutting blade 14 is made of cemented metal and is a cylindrical tool body 12.
Are joined by known means described later. The locus of the edge line of the rotating blade-shaped cutting blade 14 forms a substantially partial conical surface. The partial conical surface is formed so as to shrink toward the lower side. That is, the apex of the cone is below.

The cutting tool 11 rotates about a rotation center line L. The cutting tool 11 is attached to a hydraulic motor (not shown) and rotationally driven. The hydraulic motor is mounted on an arm (not shown) which is hydraulically free to move on the truck. Adsorption board 15 with a built-in permanent magnet in the iron lid 7
Is adsorbed. Well-known means are applied to the means for releasing the adsorption.

That is, the suction force disappears as the handle 16 rotates. The suction plate 15 has a center setting means 17. The centering means 17 has a hydraulic motor or a cutting tool 11.
The rotation center axis of is supported. Therefore, the cylindrical tool body 1
2 can rotate stably around the central axis of the iron lid 7.

FIG. 2 shows a road layer cutting process. The cutting tool 11 is rotationally driven while applying a downward pressure of an appropriate amount to the cutting tool 11. Cylindrical tool body 12
Due to the circular cutting action, the inner peripheral surface of the annular groove 23 formed by cutting the asphalt layer is formed into the cylindrical surface 21. The cutting is guided by the cylindrical tool body 12. The outer peripheral side of the circular cutting groove guided by the cylindrical tool body 12 is cut by a plurality of blade-shaped cutting blades 14.

As shown in FIG. 3, the cutting peripheral surface formed on the outer peripheral side of the circular groove is generally formed as a partial conical surface 22.
The annular groove 23 is formed by the cylindrical surface 21 and the partial conical surface 22. FIG. 4 shows a road layer portion 24 surrounded by a cut peripheral surface.
It shows the removal process to remove. The cut road layer portion 24 is surrounded by the annular groove 23 and the hole 3, and is a central annular portion.

The removal process is the same as the conventional removal process. A hydraulic removal machine 31 (known as a removal means)
-100984) is used. It is composed of a hydraulic cylinder body 32, pistons 33 and 34 on both sides, and suspension means 35. A hydraulic hose (not shown) is connected to the hydraulic cylinder body 32. Both side pistons 33,
The wedge portions 36, 36, which are the respective tip portions of 34, are sharply formed in a wedge shape.

When pressure oil is supplied to the hydraulic cylinder main body 32, the pistons 33 and 34 on both sides are pushed in the direction away from each other, the wedge portions 36 and 36 interrupt the gap between the road layer and the adjusting member 5, and the road layer is formed by the wedge action. And the adjusting material 5 are divided. FIG.
As shown in (3), the hydraulic cylinder body 32 is lifted by the lifting means 35, the road layer portion 24 is placed on the wedge portions 36, 36, and lifted and removed. If the material deteriorates, the adjustment material 5 is also removed.

After the circular cutting step of forming the circular groove first,
When performing the annular cutting step of cutting the road layer on the outer peripheral surface side of the circular groove to form the peripheral inclined surface, two types of tools are used: a cutting tool for circular cutting and a cutting tool for annular cutting.

FIG. 6 shows the adjustment restoration process or the pavement process. Clean the perimeter of the manhole. The height of the iron lid receiving frame 6 can be generally adjusted by selecting a suitable size material from the existing adjustment material 5 and using it. Fine height adjustment is E
This is performed when the S concrete 41 is poured into the space 42. For example, the ES concrete 41 located on the upper surface of the adjusting material 5
Fine-tune the thickness of.

The ES concrete 41 is an epoxy resin concrete. A new iron lid receiving frame 6 is embedded in the ES concrete 41 and set at a predetermined position. A well-known circular arc compactor (Actual number 59-97912, not shown)
The ES concrete 41 is compacted by using. The ES concrete 41 can be cured in a short time and also have a rising strength.
In this way, the annular space formed after the road layer portion is extracted in the cutting / removing step is paved with the new paving portion together with the new iron lid receiving frame 6.

The time for the curing process for curing the ES concrete 41 varies depending on the outside temperature, but the curing time under the outside temperature of 10 degrees or more is 40 minutes or less for natural curing. 1
If the temperature is 0 ° C. or less, the jet heater is used for curing within 40 minutes, the time required for the entire process is within 3 hours, the iron lid 7 is fitted on the iron lid receiving frame 6, and the traffic is immediately opened.

The weight of a truck or the like acts on the upper surfaces of the iron lid 7 and the ES concrete 41. A downward force acts on the ES concrete 41. The new pavement part, which is pressed downwards and is formed of ES concrete 41, is supported by the conical surface of the pavement road 1, which is the old road layer. E of the cone
The new pavement part formed by the S concrete 41 is supported by the conical surface of the old pavement 1, so that the wedge effect acts between the pavement 1 and the ES concrete 41.

This wedge effect has the effect of integrating the paved road 1 and the ES concrete 41 into one.
1 and the paved road 1 can be prevented from shifting. Since the ES concrete 41 is firmly supported on the paved road 1 in this way, distortion is unlikely to occur in the entire manhole, and as a result, the life of the manhole is extended.

FIG. 7 shows a road layer cutting device used in the road layer cutting step. An example of the cutting tool 11 will be briefly described. The cylindrical tool body 12 is formed by forming a cutting blade 13 containing diamond on the lower end surface of a carbon steel pipe. A commercially available product can be used as the one in which the cutting edge containing diamond is formed on the lower end surface of the carbon steel pipe. Plural wing-shaped cutting blades 14 included in the cutting tool 11
Will be prepared at the construction site. When the annular cutting step is divided into the two steps as described above, the cutting blade 13 is omitted.

That is, such a cutting tool 11 has a cutting tool 13 missing and a cutting tool (not shown) consisting only of the cylindrical tool body 12 and the winged cutting blade 14 and the winged cutting blade 14 is missing. It can be prepared as two types of cutting tools consisting of the main body 12 and the cutting blade 13.

As shown in FIGS. 8 and 9, the blade-shaped cutting blade 14 alone is attached to the cylindrical tool body 12 with bolts. The cylindrical tool body 12 is made of carbon steel.
The outer end surface 50 of the wing-shaped cutting blade 14 has a step surface 51 and a sloped surface 52.
And a vertical surface 53, and formed in a step shape. The wing-shaped cutting blade 14 is composed of a wing-shaped cutting blade main body 54 and a blade portion 55 formed by arranging.

Tube metal manufactured by Sumiko Consultant Co., Ltd. is welded and arranged on the outer end surface 50 of the wing-shaped cutting blade main body 54. The tube metal is a material in which tungsten carbide and a small amount of ferroalloy are enclosed in mild steel, and is commercially available as a welding rod material. Such a welding rod is used as a welding rod on the end surface 50 of the wing-shaped cutting blade body 54 by electric welding. Wing-shaped cutting blade main body 54 which is a base material
When the tube metal is welded to the surface of the, the tungsten carbide particles in the tube metal melt into the blade-shaped cutting blade main body 54 that is the base material, and the very hard blade portion 55 is formed. The blade portion can be formed at the construction site.

The wing-shaped cutting blade 14 of the cutting tool 11 shown in FIG.
Are interchangeably attached to the cylindrical tool body 12. The cutting tool 11 in a state where the wing-shaped cutting blade 14 is removed from the cylindrical tool body 12 can perform a circular cutting. FIG. 7 shows an annular cutting step in which the blade-shaped cutting blade 14 is attached to the cylindrical tool body 12 after the circular cutting step to perform an annular cutting.

According to this two-step process, the cutting work is carried out smoothly. When this two-step process is adopted, the annular portion surrounded by the circular groove can be removed first after the circular cutting. The state in which the annular portion is first removed is shown in FIG. After removing the annular portion first, the chip collecting tray 81 is installed in the hole 3. The outer peripheral edge portion 82 of the chip recovery dish 81 can be placed on the upper surface of the swash wall 4. A shaft supporting portion 83 is provided at the center of the chip collecting tray 81.

The shaft support portion 83 performs centering of the rotation center shaft 84 of the cutting tool 11. Central axis of rotation 84
The lower end of the conical portion 86 is supported by the center hole 87 formed in the upper end surface of the shaft support portion 83. Cutting tool 11
Is coupled to the output shaft 88 of a hydraulic motor (not shown). The output shaft 88 has a plurality of both-wing portions 89 attached thereto. Suspension rods 91 are rotatably suspended from the outer ends of both wing portions 89. A roof 92 is attached to the lower end of the hanging rod 91. A skirt 93 is attached to the lower end of the roof 92. The skirt 93 is arranged between the roof 92 and the cutting tool 11. At the lower end of the skirt 93, a sealing band 94 that comes into close contact with the road surface is provided.

According to this embodiment of the cutting means, the rotation of the cutting tool 11 is stabilized, the chips do not drop below the hole 3,
The road surface is covered by the sealing band 94, and the chips produced by the cutting tool 11 are not scattered on the road or in the air, and the noise caused by cutting is attenuated in the skirt 93. The conical surface of the annular groove to be annularly cut by the wing-shaped cutting blade 14 is smooth.

FIGS. 10A, 10B and 10C show modified examples of the cut peripheral surfaces 101, 102 and 103 having different shapes. The cut peripheral surface 101 shown in FIG. 10A is the partial conical surface described in the first embodiment. FIG. 10 (b),
The cut peripheral surface shown in (c) is a curved surface that is not a conical surface.
The curved surface shown in FIG. 10B is a concave curved surface. FIG.
The curved surface shown in (c) is a convex curved surface. These peripheral surfaces can be provided with steps rather than being continuous. The shape of the cut peripheral surface can be changed depending on the material of the road layer and the size.

[0043]

According to the method for maintaining and repairing a manhole iron lid according to the present invention, the new pavement portion and the old pavement portion are unlikely to be displaced from each other. The ring-shaped and annular parts of the upper layer are firmly supported by the lower layer,
The life of the manhole is extended.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one operation step of Embodiment 1 of a cutting device used for a human hole iron lid maintaining and repairing method of the present invention.

FIG. 2 is a cross-sectional view showing a next operation step of the first embodiment.

FIG. 3 is a cross-sectional view showing a next operation step of the first embodiment.

FIG. 4 is a cross-sectional view showing a next operation process of the first embodiment.

FIG. 5 is a cross-sectional view showing a next operation step of the first embodiment.

FIG. 6 is a cross-sectional view showing a next operation step of the first embodiment.

FIG. 7 is a front view of a partial cross section showing an embodiment of a cutting tool used in the first embodiment or another embodiment of the present invention.

FIG. 8 is a plan view of a part of FIG.

9 is a front view of a part of FIG. 7. FIG.

10 (a), (b) and (c) are conceptual diagrams showing modified examples of the cut peripheral surface.

FIG. 11 is a cross-sectional view showing steps of a cutting device used in a conventional human-hole iron lid maintenance repair method.

FIG. 12 is a cross-sectional view showing the next step of the cutting device used for the conventional human hole iron lid maintenance repair method.

[Explanation of symbols]

 1 ... Paved road 2 ... Manhole 3 ... Hole 4 ... Human hole slanted wall 5 ... Adjusting material 6 ... Iron lid receiving frame 7 ... Iron lid 11 ... Cutting tool 12 ... Cylindrical tool body 14 ... Wing cutting blade 21 ... Cylindrical surface 22 ... Partial conical surface 23 ... Annular groove 24 ... Road layer portion 32 ... Hydraulic cylinder body 33, 34 ... Piston 36 ... Wedge portion 41 ... ES concrete 50 ... Outer end surface 54 ... Wing-shaped cutting blade body 55 ... Blade portion 81 ... Chip recovery tray 82 Outer peripheral portion 83 ... Shaft support portion 84 ... Rotation center axis 87 ... Center hole 88 ... Output shaft 89 ... Both wing portions 91 ... Suspension bar 93 ... Skirt 94 ... Sealing band 101, 102, 103 ... Cutting peripheral surface

Claims (6)

[Claims] 1. A cutting device used for a manhole iron lid maintenance repair method for cutting an old road layer including an iron lid receiving frame into a donut shape and replacing it with a new road layer, for forming a cutting peripheral surface on a slope. 2. A cutting device used in a human hole iron lid maintenance repair method, comprising: a cutting means having the cutting blade of 1. and a driving means for rotating the cutting blade around a central axis of a manhole. 2. A cutting device used in the method for maintaining and repairing a manhole iron lid according to claim 1, wherein the cutting device has a cylindrical rotating body having a cutting function portion on a lower end surface side, and a peripheral surface of the rotating body. A cutting device for use in a human hole iron lid maintenance repair method, comprising: a peripheral bevel forming blade that is attached to a rotor and cut by rotation to form a beveled peripheral surface. 3. A cutting device used in the manhole iron cover maintenance repair method according to claim 2, wherein the driving means supports and drives the rotating body, and the manhole is supported by the driving means. A cutting device for use in a manhole maintenance / repair method for a manhole, comprising a flexible skirt that covers the ground in layers in a circular shape. 4. The cutting device used in the method for maintaining and repairing a manhole iron cover according to claim 3, wherein the lower end portion of the skirt is composed of a circular contact band that comes into close contact with the ground. Cutting device used for maintenance and repair method. 5. One selected from claim 2 to claim 4.
It is a cutting device used for the human hole iron cover maintenance repair method of Claim, Comprising: The said peripheral bevel formation blade is attachable / detachable to the said rotating body, The cutting device used for the human hole iron lid maintenance repair method characterized by the above-mentioned. 6. One selected from claim 1 through claim 4.
A cutting device used in the method for maintaining and repairing a manhole iron cover according to claim 1, wherein centering means for positioning and supporting a rotating shaft sharing the centerline of the rotating body at the centerline of the manhole is provided at the center of the iron cover. The cutting device used in the method of maintaining and repairing the iron hole iron lid, which is characterized by being used.