JPH11241360A - Underground buried structure removing method, and cutting blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously conduct cutting of pavement slab and removal of an underground buried structure without noise, and speedily conduct these works. SOLUTION: An inward inclined cutting blade 2 is set, and reaction force of a jack 3 is received by a manhole cover receiving frame 51. As the cutting blade 2 cuts a pavement slab P, a pulling force of the jack 3 acts on the manhole cover receiving frame 51, and the manhole cover receiving frame 51 and the cut pavement slab P around it are pulled up and removed. Since the cut surface of the cut pavement slab P is inclined, a newly constructed pavement slab can be integrated with the old pavement slab P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing underground objects such as manholes and a cutting blade used for the method.

[0002]

2. Description of the Related Art A manhole installed on a road is distorted due to long-term use, the material strength is deteriorated, and the manhole is aged. Aged manholes will be replaced and repaired.

As a method for repairing and maintaining manholes, there is a method (Japanese Patent Publication No. Sho 63-55562) in which a pavement plate is cut by rotating a circular cutter to remove and replace the manhole in a short time.

[0004]

There is a need to reduce the noise and speed up the cutting of the pavement plate, and to increase the integration of the restored pavement plate with the old pavement plate. The drawing machine does not generate noise, but the paving slabs are removed so that they can be peeled off. However, there was a problem that it was not enough and was easily deformed after opening the traffic.

An object of the present invention is to cut a pavement plate quickly and with low noise, to provide a uniform cut surface, to integrate the restored pavement plate with the old pavement plate, and to deform the road surface after opening of traffic. Is to prevent it from happening.

[0006]

In order to reduce the noise of the pavement plate cutting process, the cutting blade is pressed into the pavement plate for cutting, and the cutting blade is inclined inward so that the pavement plate can be easily pressed into the pavement plate. . Further, since the cut surface is an inclined surface, the integrity of the restored pavement plate and the old pavement plate can be enhanced. further,
By applying vibration and / or rocking during press-fitting of the cutting blade, cutting of the pavement plate was facilitated. By making the cutting blade a triangular tooth or installing the teeth at intervals, it is easy to cut into the pavement plate.

[0007]

FIG. 1 is a sectional view of a press-fitting device 1 and a cutting blade 2 used in the present invention.

The cutting blade 2 has a circular shape, and a flange 21 for receiving a press input is provided at an upper portion. The cutting blade 2 is slanted and tapered. Triangular teeth 22 are continuously provided at the tip as shown in FIG. The shape of the teeth is an appropriate shape such as a square or a trapezoid. The cutting blade is made of a super-high alloy only for the teeth to reduce tooth wear.

The press fitting device 1 comprises a frame 11, a center hole jack 3 provided at the center, and a reaction rod 4. The frame 11 is composed of a circular base 12 and legs 14 connecting the upper frame 13.

The reaction force rod 4 has a breaking device 41 at the tip. The breaking device 41 has a cross shape and a wedge-shaped tip, and expands and contracts in the lateral direction to bite into an underground object to be removed, for example, a manhole cover receiving frame.

[0011] Alternatively, an engaging tool is provided at the tip of the reaction force rod 4 for engaging with the inner wall surface of the underground object, and the reaction force when the cutting blade 2 is pressed into the underground object is taken. The reaction force rod 4 is made telescopic so as to correspond to the burial depth of the underground object, or provided with a coupler 42 for extension. The case where the manhole receiving frame is removed will be described in more detail with reference to FIG. The cutting blade 2 is installed so as to surround the manhole to be removed, and the press-fitting device 1 is placed on the flange 21 of the cutting blade. The reaction force rod 4 is lowered into the manhole, the tip breaking device 41 is extended in the lateral direction, and the receiving frame 51 from which the tip is to be removed.
And the reaction force when press-fitting the cutting blade 2 is taken into the manhole.

When the center hole jack 3 of the press-fitting device 1 is operated and the reaction force rod 4 is pulled upward, the cutting blade 2 penetrates the pavement plate P. Breaking device 41 is receiving frame 51
Therefore, a reaction force is obtained from the receiving frame 51. Since the cutting blade 2 is inclined inward and pushes the inner paving slab P upward, penetration is easy.

Further, if the press-fitting is continued, the pavement plate P is cut, and an inclined cut surface is obtained. When the paving slab P is cut, the lifting force of the center hole jack 3 is transmitted from the breaking device 41 to the receiving frame 51, and the receiving frame 51 and the cut pavement slab P are lifted and removed integrally.

After removing the existing receiving frame 51, the periphery of the manhole is cleaned, and the installation position of the new receiving frame is adjusted with a height adjusting material. Fine adjustment of the height is performed by the thickness of the resin concrete located on the upper surface of the adjusting material when filling the hard resin concrete.

As described above, the ring-shaped space formed at the trace where the pavement slab P has been removed in the cutting / removing step is paved with a rapidly hardening resin concrete, and is compacted by an arc rolling machine.

When an engagement member is provided at the tip of the reaction force rod 4, the engagement member is engaged with the inner surface of the inclined wall of the manhole to take a reaction force, and the cutting blade is press-fitted to cut the pavement plate P. After the cutting, the receiving frame and the pavement slab cut by the conventional removing method are removed. Hydraulic removal machine known as a removal means (Japanese Utility Model Application Laid-Open No. 62-1)
No. 00984), the wedge at the tip is cut into the lower side of the receiving frame, and the removing operation is performed.

[0017]

According to the present invention, since the cutting blade is press-fitted, there is no noise such as a rotary blade for cutting the road surface, and the pavement plate can be cut without noise. In addition, since the cutting blade is inclined inward, the cut pavement plate is pushed up, and cutting can be easily performed. Furthermore, when the reaction force of the press-fitting is taken on the lower surface of the iron cover receiving frame, the cutting of the pavement plate, the cutting paved plate, and the removal of the iron cover receiving frame can be performed at the same time. By making the shape of the cutting blade a triangle or discontinuous teeth, the cutting blade can easily bite into the road surface, and the work can be performed smoothly. Since the cut surface of the paving slab becomes an inclined surface, and the restored paving slab is constructed so as to rest on the slope of the old paving slab, the new and old paving slabs are integrated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a cutting step of the present invention.

FIG. 2 is a front view of the press-fitting device.

[Explanation of symbols]

 P: Paving plate 1 ... Press-in device 11 ... Frame 2 ... Cutting blade 21 ... Flange 3 ... Jack 4 ... Reaction force rod 41 ... Breaking device 42 ... Coupler 5 ... Manhole (underground buried object) 51 ... Receiving frame

Claims (7)

[Claims] 1. An inclined cutting blade is installed so as to surround an underground buried object, and the cutting blade is pressed into a pavement plate and cut.
An underground buried object removal method that removes the underground buried object and the pavement plate together. 2. The method according to claim 1, wherein a reaction force of the press-fitting is applied to the underground object. 3. The method for removing underground buried objects according to claim 1, wherein vibrations and / or oscillations are simultaneously applied at the time of press-fitting and cutting. 4. A cutting blade for removing an underground buried object having a cutting blade inclined inward. 5. The cutting blade according to claim 4, wherein the cutting blade has a circular shape. 6. The cutting blade according to claim 4, wherein said cutting blade has triangular teeth. 7. The cutting blade for removing an underground buried object according to claim 4, wherein the teeth are provided discontinuously.