JP3025188B2 - Cutting equipment used for maintenance and repair of manhole iron lids - Google Patents

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 of maintaining and repairing a manhole iron cover. More specifically, the present invention relates to a cutting device used for a maintenance and repair method for a manhole iron cover capable of preventing deformation of a roadbed surface after construction.

[0002]

2. Description of the Related Art A man-hole iron cover (hereinafter, referred to as a paved road) is provided on paved road surfaces nationwide.
Manhole). Manhole,
It is a facility provided so that people can enter and exit the horizontal hole for water supply, sewage, communication, and power. The manhole is composed of a circular hole wall opened from the road surface, an iron cover receiving frame to reinforce the periphery of the hole wall, an iron cover fitted into the iron cover receiving frame, a concrete ring to reinforce the whole. ing. Manholes exposed to wind and rain, with tons of trucks passing over the top surface, are distorted, deteriorate in material strength, and age. Manholes are replaced and repaired periodically according to their age.

[0003] As a cutting device used in the maintenance and repair method of a manhole iron cover, an epoch method (registered trademark, Japanese Patent Publication No. Sho 63-55562) is known and famous. This method uses a cylindrical circular cutter that rotates around a support shaft positioned at the center of a manhole. As shown in FIG. 11, the asphalt around the human hole 01 is cut into a circle, as shown in FIG. As shown, the iron lid receiving frame 03 is integrated with the asphalt disk 02.
Is removed by a pulling tool 04 and lifted and removed. Following such a removal process, the asphalt disk is replaced, a new iron lid receiving frame and a new iron lid are installed, and the repair and replacement work is completed.

[0004] Such restoration work is inexpensive, and can be completed within three hours, even if the curing time of the epoxy resin concrete called ES concrete used in the restoration work is included, and the traffic is opened. It is known that it is an excellent construction method, such as a short time until the start.

[0005]

A roadbed on which a new disk body is fitted on a diskbed part of which is cut into a disk shape is constructed by a large truck which exerts a large pressure on the upper surface of a manhole. 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.

[0007] An object of the present invention is to provide a cutting apparatus used for a maintenance and repair method for a manhole iron cover in which a roadbed surface is unlikely to be deformed.

[0008] Another object of the present invention is to provide a cutting apparatus used in a method of maintaining and repairing a manhole iron cover 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.

A first aspect of the present invention is a cutting apparatus used in a method for maintaining and repairing a manhole iron cover, in which a surrounding old road layer including an iron cover receiving frame is cut into a donut shape and replaced with a new road layer. A cutting device used in a construction method, wherein the cutting device has a cylindrical rotating body having a cutting blade on a lower end surface side, and a driving unit that rotates the rotating body by supporting the rotating body around a central axis of a manhole, A blade-shaped cutting blade which is detachably attached to the peripheral surface of the rotating body and is cut by rotation to form a cutting peripheral surface which is a slope.

The cutting device used in the method of maintaining and repairing a manhole iron cover according to the second invention is the cutting device used in the method of maintaining and repairing a manhole iron cover according to the first invention, and is supported by the driving means and includes the manhole. And a flexible skirt that covers the ground of the road layer in a circular shape.

A cutting device used in the method of maintaining and repairing a manhole iron cover according to the third invention is a cutting device used in the method of maintaining and repairing a manhole iron cover according to the second invention, and is provided at the lower end of the skirt with a ground. It is characterized by comprising a circular contact band in close contact.

A fourth aspect of the present invention is a cutting device used in the method of maintaining and repairing a manhole iron cover according to the first to third aspects of the present invention, wherein the cutting device is used in the method of maintaining and repairing a manhole iron cover according to the first to third aspects. A centering means for positioning and supporting the rotating shaft sharing the center line of the manhole at the center of the iron cover is provided.

[0014]

[0015]

The road layer repaired by the cutting device used in the method of maintaining and repairing a manhole iron cover according to the present invention can form a peripheral slope, and a new pavement portion and an old pavement portion are formed through a slope having a peripheral surface. Overlapping. When a downward pressure acts on the new upper pavement, the upper layer and the lower lower pavement tighten together with a wedge effect. Such a fastening force promotes the integration of the two layers, and the two layers are hardly displaced. The cutting tool that forms the cutting peripheral surface is composed of a cylindrical tool and a plurality of wing-like super hard welded portions attached to the peripheral surface of the tool. When the circular cutting is performed after the circular cutting, the cutting is easy and the load on the blade is reduced.

[0017]

Next, an embodiment of the present invention will be described. FIG. 1 is a cross-sectional view showing Embodiment 1 of a cutting device used in a method of maintaining and repairing a manhole iron cover according to the present invention, and shows a relationship between a paved road 1 and a manhole 2. Paved road 1
Asphalt paved road is shown. The pavement road 1 is provided with a roadbed on a lower subgrade 1a. The roadbed is an intermediate layer containing gravel, and is formed from a lower roadbed 1b and an upper 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 composed of the roadbed, the intermediate layer and the base layer. Since there is no essential relationship between the structure of such asphalt pavement and the present invention, terms such as subbase, intermediate layer, base layer, etc. are not used strictly below. In this specification, all or a part of all layers is simply referred to as a roadbed or a road layer.

The manhole 2 comprises a hole 3, a manhole inclined wall 4 for shaping the inner surface of the hole 3 and protecting the hole, an adjusting material 5 for adjusting the height, an iron cover receiving frame 6 and an iron cover 7. ing. Conditioning material 5 is made of annular precast concrete,
Adjust the approximate height of the iron lid receiving frame. FIG. 1 shows a preparation process for road layer cutting. Conventionally, the road layer cutting step is called a circular cutting step because a groove is formed in a circular shape.

Since the cutting device used in the method of maintaining and repairing the iron cover of the present invention does not form a circular groove, but forms an annular groove having a radial expansion, the specification generally describes an annular cutting step. Another name. The cutting tool 11 used in the annular cutting process is conceptually shown in FIG. Cutting tool 11
Has a cylindrical tool body 12. A cutting tool 13 containing diamond is planted on a cylindrical lower end surface of the cylindrical tool body 12. When the annular cutting step is divided into a circular cutting step and an annular cutting step for forming a slope, the one in which the cutting blade 13 is omitted is also used.

The cutting tool 11 includes a plurality of wing-shaped cutting blades 14.
It has. The plurality of wing-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 a hard metal and is made of a cylindrical tool body 12.
Are joined by known means described later. The trajectory of the edge line of the rotating wing-shaped cutting blade 14 substantially forms a partial conical surface. The partial conical surface is formed so as to wither downward. That is, the apex of the cone is below.

The cutting tool 11 rotates around a rotation center line L. The cutting tool 11 is attached to a hydraulic motor (not shown) and is driven to rotate. The hydraulic motor is mounted on an arm (not shown) that is free to move hydraulically on the truck. Adsorber 15 with permanent magnet built in iron lid 7
Is adsorbed. Known means is applied to the means for releasing the suction.

That is, the suction force disappears due to the rotation of the handle 16. The suction disk 15 has a centering means 17. Hydraulic motor or cutting tool 11
Are 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 step. The cutting tool 11 is rotationally driven while applying an appropriate downward pressure to the cutting tool 11. Cylindrical tool body 12
, The inner peripheral surface of the annular groove 23 formed by cutting the asphalt layer is formed on the cylindrical surface 21. Cutting is guided by the cylindrical tool body 12. The outer peripheral side of the circular groove guided by the cylindrical tool body 12 is cut by a plurality of wing-shaped cutting blades 14.

As shown in FIG. 3, the cutting peripheral surface formed on the outer peripheral side of the circular groove is formed substantially 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 section 24 surrounded by a cutting surface.
2 shows a removal process for removing the. The cut road layer portion 24 is a central annular portion sandwiched and surrounded by the annular groove 23 and the hole 3.

The removal process is the same as the conventional removal process. A known hydraulic removing machine 31 (Japanese Utility Model Application
No. -100984). It comprises a hydraulic cylinder body 32, pistons 33, 34 on both sides, and suspension means 35. A hydraulic hose (not shown) is connected to the hydraulic cylinder body 32. Pistons on both sides 33,
The wedge portions 36, 36, which are the tip portions of the respective, are sharply formed in a wedge shape.

When pressurized oil is supplied to the hydraulic cylinder body 32, the pistons 33, 34 on both sides are pushed in a direction away from each other, and the wedge portions 36, 36 are interrupted between the road layer and the adjusting member 5, and the wedge action causes the wedge portions 36, 36 to intervene. And the adjusting material 5 are divided. FIG.
As shown in (5), the hydraulic cylinder body 32 is lifted by the lifting means 35, and the road layer portion 24 is placed on the wedge portions 36, 36 and lifted off. If the aging is progressing, the adjusting material 5 is also removed.

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

FIG. 6 shows the adjustment restoring step or the pavement step. Clean the perimeter of the manhole. The height adjustment of the iron cover receiving frame 6 can be generally performed by selecting and using an appropriate size from the existing adjusting members 5. For fine height adjustment,
This is performed when the ES concrete 41 is poured into the space 42.
For example, the ES concrete 4 located on the upper surface of the adjusting material 5
Fine-tune with a thickness of 1.

The ES concrete 41 is an epoxy resin concrete. A new iron lid receiving frame 6 is embedded in the ES concrete 41 and installed at a predetermined position. Known circular arc rolling machine (Japanese Utility Model Application Laid-Open No. 59-97912, not shown)
Is used to compact the ES concrete 41. In the ES concrete 41, the rising strength can be obtained in a short curing time.
As described above, the annular space formed after the road layer portion is extracted in the cutting / removing process is paved with a new paved portion together with the new iron lid receiving frame 6.

The time of 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 ° C. or more is 40 minutes or less in natural curing. 1
When the temperature is 0 degrees or less, curing is performed within 40 minutes using a jet heater, the time required for all processes is set to 3 hours or less, and the iron cover 7 is fitted into the iron cover receiving frame 6 to quickly open the traffic.

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

This wedge effect has an effect of integrating the pavement road 1 and the ES concrete 41 and has a function of integrating the ES concrete 4.
1 and the paved road 1 can be prevented from shifting. As described above, since the ES concrete 41 is firmly supported on the pavement road 1, the entire manhole is unlikely to be distorted, 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 embodiment of the cutting tool 11 will be briefly described. The cylindrical tool body 12 has a cutting blade 13 including diamond formed on a lower end surface of a steel pipe made of carbon steel. Commercially available carbon steel pipes having a cutting edge containing diamond formed on the lower end surface thereof can be used. Plural wing-shaped cutting blades 14 provided in the cutting tool 11
Is prepared at the construction site. When the annular cutting step is divided into two steps as described above, the cutting blade 13 is omitted.

That is, such a cutting tool 11 is a cutting tool (not shown) composed of only the cylindrical tool body 12 and the wing-shaped cutting blade 14 without the cutting blade 13 and a cylindrical tool having the wing-shaped cutting blade 14 missing. Two types of cutting tools including the main body 12 and the cutting blade 13 can be prepared.

As shown in FIGS. 8 and 9, a single blade-shaped cutting blade 14 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 slope 52.
And a vertical surface 53, and are formed in a stepped shape. The wing-shaped cutting blade 14 includes a wing-shaped cutting blade main body 54 and a blade portion 55 formed by embedding.

A tube metal manufactured by Sumiko Consulting Co., Ltd. is welded and mounted on the outer end face 50 of the wing-shaped cutting blade body 54. 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. Such a welding rod material is provided as a welding rod on the end face 50 of the wing-shaped cutting blade body 54 by electric welding. Wing-like cutting blade body 54 as a base material
When the tube metal is welded to the surface of the base metal, the particles of tungsten carbide in the tube metal melt into the wing-shaped cutting blade main body 54 as a base material, and a very hard blade portion 55 is formed. This blade portion can be formed at a construction site.

The wing-shaped cutting blade 14 of the cutting tool 11 shown in FIG.
Are exchangeably mounted on 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 main body 12 can perform circular cutting. FIG. 7 shows an annular cutting step in which the wing-shaped cutting blade 14 is attached to the cylindrical tool body 12 after the circular cutting step to perform an annular cutting.

According to the two-step process, the cutting work is performed smoothly. When this two-step process is adopted, after cutting, an annular portion surrounded by a circular groove can be removed first. FIG. 7 shows a state in which the annular portion is removed first. After removing the annular portion first, a chip collecting dish 81 is set in the hole 3. The outer peripheral edge portion 82 of the chip collecting tray 81 can be placed on the upper surface of the inclined wall 4. A shaft support portion 83 is provided at the center of the chip collecting tray 81.

The shaft support portion 83 centers the center of rotation 84 of the cutting tool 11. Rotation center axis 84
Is supported by a center hole 87 formed in the upper end surface of the shaft support portion 83. Cutting tool 11
Is coupled to an output shaft 88 of a hydraulic motor (not shown). A plurality of two-wing parts 89 are attached to the output shaft 88. Hanging rods 91 are rotatably suspended from the outer end portions of the two wing portions 89, respectively. A roof 92 is attached to the lower end of the hanging rod 91. A skirt 93 is attached to a 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 is in close contact with the road surface is provided.

According to the embodiment of the cutting means, the rotation of the cutting tool 11 is stabilized, and the chips do not fall below the hole 3.
The road surface is covered with the sealing band 94, and chips generated by the cutting tool 11 are not scattered on the road and in the air, and noise due to cutting is attenuated in the skirt 93. The conical surface of the annular groove that is 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 cutting peripheral surface 101 shown in FIG. 10A is the partial conical surface described in the first embodiment. FIG. 10B,
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 stepped rather than continuous. The shape of the cutting peripheral surface can be changed depending on the road layer material, size, and the like.

[0043]

According to the method of maintaining and repairing a man-made iron cover according to the present invention, a gap between a new pavement portion and an old pavement portion hardly occurs. The upper ring-shaped and annular parts are firmly supported by the lower layer,
Manhole life is extended.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one operation process of Embodiment 1 of a cutting device used for a method of maintaining and repairing a manhole iron cover according to 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 step of the first embodiment.

FIG. 5 is a 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. 7;

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

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

FIG. 11 is a cross-sectional view showing the steps of a cutting device used in a conventional manhole maintenance / repair method.

FIG. 12 is a cross-sectional view showing the next step of the cutting apparatus used in the conventional repair method of maintaining and repairing a perforated iron lid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pavement road 2 ... Manhole 3 ... Hole 4 ... Manhole slope 5 ... Adjustment material 6 ... Iron lid receiving frame 7 ... Iron lid 11 ... Cutting tool 12 ... Cylindrical tool body 14 ... Wing-shaped cutting blade 21 ... Cylindrical surface 22 ... Partial conical surface 23 ... Circular groove 24 ... Road layer part 32 ... Hydraulic cylinder body 33,34 ... Piston 36 ... Wedge part 41 ... ES concrete 50 ... Outer end face 54 ... Wing-shaped cutting blade body 55 ... Cutting part 81 ... Chip collecting dish 82 ... outer peripheral edge part 83 ... shaft support part 84 ... rotation center axis 87 ... center hole 88 ... output shaft 89 ... both wing parts 91 ... hanging rod 93 ... skirt 94 ... sealing band 101, 102, 103 ... cutting peripheral surface

Claims (4)

(57) [Claims] 1. A cutting device used in a manhole iron cover maintenance and repair method for cutting a surrounding old road layer including an iron lid receiving frame into a donut shape and replacing it with a new road layer , wherein the cutting device has a lower end surface side. A rotating body having a cutting blade, a driving means for supporting and rotating the rotating body around a central axis of a manhole, and a rotating means detachably mounted on a peripheral surface of the rotating body. Cutting to form a beveled cutting surface by cutting
A cutting device used for a maintenance and repair method of a manhole iron cover, comprising a blade . 2. A cutting device used in the method of maintaining and repairing a manhole iron cover according to claim 1 , comprising a flexible skirt supported by said driving means and circularly covering a ground of a road layer provided with said manhole. A cutting device used in a method of maintaining and repairing a manhole iron cover. 3. A cutting device for use in the method of maintaining and repairing a manhole iron cover according to claim 2 , comprising: a lower end portion of the skirt and a circular contact band that closely adheres to the ground. Cutting equipment used for maintenance and repair work. 4. A 1 is selected from claims 1 to 3
It is a cutting device used for the manhole iron cover maintenance repair method according to claim, wherein a centering means for positioning and supporting a rotation axis sharing a center line of the rotating body at a center line of the manhole is provided at a center portion of the iron cover. A cutting device used in a method of maintaining and repairing a man-made iron cover.