JP6750970B2 - Cutting device and cutting method thereof - Google Patents

Description

The present invention relates to a cutting device and a cutting method thereof, and more particularly, to a cutting device and a cutting method for forming a gap in a joint portion between an existing manhole and a sewer pipe.

Conventionally, ground subsidence caused by earthquakes and liquefaction of backfill soil used for burying sewer pipes have often caused subsidence of excavated parts and floating of sewer pipes and manholes.

Since the joint part of the sewer pipe connected to this manhole is fixed, the manhole and sewer pipe could move when the earthquake occurred, causing the joint part to rupture and failing to fulfill its sewer function. ..

Therefore, there is a seismic resistant structure in which a flexible seismic resistant member is installed at the joint between the manhole and the sewer pipe.

On the other hand, when the manhole and sewer pipe joints are buried in a fixed state, it takes a lot of time and cost to dig up the manhole and sewer pipes and construct flexible seismic resistant members. Will be needed.

Therefore, when earthquake resistance is to be applied to an existing manhole or sewer pipe, the joint part is cut using a cutting machine such as a breaker, and a seismic resistant member is inserted into the cut part to connect the manhole and sewer pipe. Gives flexibility to.

The work of cutting the joint between the manhole and the sewer pipe is performed in a very narrow space inside the manhole, which causes not only health damage due to dust scattering, odor, gas, but also oxygen deficiency and hydrogen sulfide poisoning. There are serious accidents related to human life, such as accidents that occur due to heavy rain, and accidents where workers are washed away due to a sudden rise in water level due to heavy rain.

Therefore, a method has been proposed in which a disassembleable drill is assembled in a manhole and the joint portion of the sewer pipe is cut with a core drill that matches the inner diameter of the joint portion between the manhole and the sewer pipe (for example, Patent Document 1). reference).

JP2012-246723A

In recent years, sewer pipes have become larger in size to improve drainage capacity, and in order to cut the joint portion of the large sewer pipes, the outer diameter of a core drill used in a cutting machine has also become larger.

However, there was a problem that this large core drill could not be brought into the manhole. The inside diameter of the opening of the manhole is 750 mm to 2200 mm, which is defined by domestic standards. The outer diameter of the core drill that can cut a large-diameter sewer pipe joint that exceeds the inner diameter of the opening of the manhole at one time exceeds the standard of the inner diameter of the opening of the manhole, so you can bring the core drill inside the manhole. Absent.

Therefore, for a large sewage pipe in which the joint portion between the manhole and the sewer pipe cannot be cut using the core drill, the joint portion between the manhole and the sewer pipe can only be cut manually by using a breaker or the like.

The manual cutting of the joint portion in the manhole is performed in a very narrow space inside the manhole, which increases health hazards due to dust scattering, odor, gas and the like.

Further, serious accidents related to human life, such as accidents caused by oxygen deficiency and hydrogen sulfide poisoning, and accidents where workers are washed away due to a sudden rise in water level due to heavy rain, are also increased.

In addition, the work of cutting the joint portion of the large-diameter sewer pipe in a narrow manhole limits the number of workers, which inevitably prolongs the construction period.

Further, in order to manually cut the upper part of the joint portion of the large-diameter sewer pipe, the work at a high place also increases, so that the cutting work of the large-diameter sewer pipe joint portion is very dangerous.

The present invention has been made in view of the above circumstances, and provides a cutting device and a cutting method that can be carried in and assembled in a narrow manhole and that simplifies the cutting work of a large-diameter sewer pipe joint. The purpose is to

In the present invention, in order to solve the above problems, in a cutting device for forming a gap in a joint portion between an existing manhole and a sewer pipe, a shaking prevention portion fixed to a side wall of the sewer pipe or a side wall of the manhole. Cutting means that is connected to the shaking prevention portion and moves along the joint portion, and that the gap formed in the joint portion is continuously cut in the groove direction of the gap; There is provided a cutting device, comprising: a support part connected to the prevention part.

As a result, the shaking prevention part is fixed to the side wall of the sewer pipe or the side wall of the manhole, the cutting means is connected to the shaking prevention part and moved along the joint, and the gap formed in the joint is in the groove direction of the gap. It is continuously cut, and the support portion connects the cutting means and the shaking prevention portion.

Further, in the present invention, in the cutting method of forming a gap in a joint portion between an existing manhole and a sewer pipe, a shaking prevention part is fixed to a side wall of the sewer pipe or a side wall of the manhole, and a cutting means is provided. , A step of connecting to the shaking prevention part via a support part, the cutting means moves along the shaking prevention part, and the gap formed in the joint part of the manhole and the sewer pipe is And a step of continuously cutting in the groove direction of the gap.

As a result, the shaking prevention part is fixed to the side wall of the sewer pipe or the side wall of the manhole, the cutting means is connected to the shaking prevention part and moved along the joint part, and the gap formed in the joint part is formed in the groove direction of the gap. It is continuously cut, and the support portion connects the cutting means and the shaking prevention portion.

According to the cutting device and the cutting method of the present invention, the shaking prevention part is fixed to the side wall of the sewer pipe or the side wall of the manhole, the cutting means is connected to the shaking prevention part and moved along the joint part, and The formed gap is continuously cut in the groove direction of the gap, and the support part connects the cutting means and the motion prevention part, so there is no need for a large core drill that cannot be inserted into the manhole and a large diameter hole. The joint portion with the sewer pipe can also be easily cut. Further, since the work of personnel in a narrow manhole can be reduced and simplified, human health damage due to dust scattering, odor, gas, etc. can be reduced.

It is a figure which shows the structure of the cutting device which concerns on 1st Embodiment. It is a figure which shows the cutting part formed in a sewer pipe. It is a figure which shows the state which installed the guide rail in the sewer pipe. It is a side view which shows the state which installed the drill and the support metal fitting in the guide rail. It is a figure which shows the state which has drilled the cutting part of the sewer pipe with the drill bit. It is a figure which shows the state which is cutting the groove part along the guide rail from the cutting trace which was perforated. It is a figure which shows the state in which the cutting trace became circular. It is a figure which shows the state after cutting was completed and the cutting device was removed. It is a figure which inserts an earthquake-proof member into the formed clearance and shows another state. It is a side view which shows the structure of the cutting device which concerns on 2nd Embodiment. It is a front view which shows the structure of the cutting device which concerns on 2nd Embodiment. It is a side view which shows the structure of the cutting device which concerns on 3rd Embodiment. It is a top view which shows the installation method of the guide rail which concerns on 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is a diagram showing a configuration of a cutting device according to a first embodiment.
As shown in FIG. 1, the cutting device 100 includes a drill 110, a drill bit 120, a support fitting 130, a guide rail 140, and a fixing fitting 150.

The drill 110 can be rotated to initiate end drilling by pressing the drill bit 120 against an object. Moreover, the drill bit 120 is provided so that the groove can be continuously cut by moving the drill 110.

The support fitting 130 includes a fixed portion 131, a support 132, and a sandwiching portion 133.
The drill 110 is fixed to the fixing portion 131 provided at one end of the rod-shaped support 132 so that the drill bit 120 provided in the drill 110 and the support 132 are vertical.

A sandwiching portion 133 is fixed to the other end of the support column 132 so as to be parallel to the drill bit 120.

The fixing part 131 can be slid forward and backward in the propelling direction of the drill 110 while the drill 110 is fixed. In addition, by using a prime mover such as a motor or a control device for this slide movement, the slide movement can be automated and remote control can be performed.

The sandwiching portion 133 can move along the guide rail 140 by holding the guide rail 140. A sliding motor can be automated and a remote operation can be performed by using a motor, for example, a motor or a control device, for moving the sandwiching portion 133.

The guide rail 140 is a steel material having a cylindrical shape centered on the central axis R, and radially provided with fixing brackets 150 outside the center of the rail surface.

By making the inner diameter of the guide rail 140 smaller than the inner diameter of the opening of the manhole at the construction site, the guide rail 140 can be easily carried into the manhole. Alternatively, the divided guide rails 140 may be assembled in the manhole. The guide rail 140 will be described later.

The fixing bracket 150 includes a column 151 and a seat 152.
The fixing bracket 150 can be detached from the guide rail 140 and can be removed when passing through a narrow manhole opening. Further, the column 151 is a connecting portion with the seat 152, and the length of the fixing bracket 150 can be expanded and contracted. Thereby, the position of the fixed guide rail 140 can be finely adjusted.

FIG. 2 is a diagram showing a cut portion formed in the sewer pipe.
As shown in FIG. 2, the manhole 200 includes a joint portion 210 that is connected to the sewer pipe 300. Further, the sewer pipe 300 is vertically connected to the side wall of the manhole 200, and the inside of the sewer pipe 300 includes a side wall 310.

In the joint portion 210, since the sewer pipe 300 and the manhole 200 are fixed with concrete or the like, the manhole 200 or the sewer pipe 300 moves up and down due to liquefaction or liquefaction of backfill soil that occurs when an earthquake occurs, The joint portion 210 may be damaged due to the pressure applied to the portion 210.

In order to prevent the joint portion 210 from being damaged when an earthquake occurs, it is necessary to give the joint portion 210 flexibility so that pressure is not directly applied to the fixed joint portion 210. Therefore, a cutting portion 230 is formed on the outer periphery of the joint portion 210 between the manhole 200 and the sewer pipe 300, and a seismic resistant member is inserted into the cutting portion 230 to divide the manhole 200 and the sewer pipe 300 so as to have flexibility. You can put it on.

Although the cut portion 230 is provided on the manhole 200 side in the present embodiment, the cut portion 230 may be provided on the side wall 310 of the sewer pipe 300 depending on the situation of the site.

FIG. 3 is a diagram showing a state in which the guide rail is installed in the sewer pipe.
As shown in FIG. 3, when the joint portion 210 is provided, the guide rail 140 is installed so that the central axis R of the guide rail 140 and the central axis R of the sewer pipe 300 are coaxial with each other. At this time, the guide rail 140 is completely fixed to the side wall 310 by adjusting the length of the fixing brackets 150 radially provided on the guide rail 140.

The fixing bracket 150 fixes the guide rail 140 by uniformly pressing the receiving portions 152 provided radially of the guide rail 140 against the side wall 310. At this time, it is desirable to adjust the length of the fixing bracket 150 on the side wall 310 such that the central axis R of the guide rail 140 is coaxial with the central axis r of the sewer pipe 300, but it does not have to be completely the same. There is no hindrance to the enforcement.

FIG. 4 is a side view showing a state in which the drill and the support fitting are installed on the guide rail.
As shown in FIG. 4, the drill 110 and the drill bit 120 are connected to a guide rail 140 via a support fitting 130.
The support fitting 130 is connected so as to sandwich the guide rail 140 in the horizontal direction with the sandwiching portion 133, and can move along the guide rail 140. A fixing portion 131 is provided at the tip of the support column 132 that rises vertically from the sandwiching portion 133.

The drill 110 is attached to the fixed portion 131 toward the joint portion 210, and the drill bit 120 is attached to the tip of the drill 110 toward the joint portion 210.
When the drill 110 is started in this state, the drill bit 120 rotates. By sliding the drill 110 fixed to the fixing portion 131 toward the joint portion 210, the tip of the drill bit 120 can pierce the cutting portion 230.

FIG. 5: is a figure which shows the state which has drilled the cutting part of the sewer pipe with the drill bit.
As shown in FIG. 5, when the drill 110 is started, the drill bit 120 rotates, and the cutting portion 230 is drilled while sliding the drill 110 fixed to the fixing portion 131 toward the joint portion 210. As a result, the cutting portion 230 is cut and a cutting mark 231 is formed.

The length of the cutting mark 231 can be adjusted by the slide width of the fixing portion 131, but when deep cutting is performed depending on the situation of the site, the cutting mark 231 is cut by making the length of the drill bit 120 long. The length of can be adjusted.

For the sliding movement of the fixed portion 131, by using a prime mover such as a motor or a control device, the movement can be automated and remote controlled. As a result, there is no need to work in the manhole when drilling, and it is possible to eliminate health hazards and personal injury due to dust scattering, odor, gas, etc.

Further, it is desirable that the length of the cutting trace 231 be shorter than the thickness of the joint portion 210, and that cutting be performed so that a part of the thickness of the joint portion 210 remains. By thus providing the joint portion 210 with a partial slit that leaves a part of the thickness, a fragile portion is formed in the joint portion 210, and the fragile portion is broken when an external force such as an earthquake is applied, and the manhole 200 or the sewer pipe is broken. Buckling damage and the like of 300 can be prevented. Further, by leaving a part of the thickness of the joint portion 210, it is possible to prevent the inflow of earth and sand and the water leakage from the side facing the cutting direction.

FIG. 6 is a diagram showing a state in which a groove portion is cut along a guide rail from a cut mark made by punching.
As shown in FIG. 6, the sandwiching portion 133 is slid in an annular shape along the guide rail 140. Then, the drill 110 connected and fixed to the sandwiching portion 133 interlocks with the annular guide rail 140 so as to draw a concentric arc. By doing so, the drill bit 120 can cut the joint portion 210 so as to draw an arc that is concentric with the annular guide rail 140 and widen the groove portion of the cutting mark 231.

Further, when the sandwiching portion 133 is further slid in the same direction at the same time as the cutting and the cutting trace 231 is widened, the sandwiching portion 133 makes one round around the guide rail 140, and at the same time, the cutting trace 231 which was an arc started to be drilled. When the place is reached, the cutting mark 231 becomes annular.

For the movement along the guide rail 140, by using a prime mover, for example, a motor or a control device, the movement can be automated and remote controlled. As a result, there is no need to work in the manhole when drilling, and it is possible to eliminate health hazards and personal injury due to dust scattering, odor, gas, etc.

In addition, in the present embodiment, an example in which one drill 110 is connected to the guide rail 140 and the cutting portion 230 is cut by the drill bit 120 while moving is given, but a plurality of drills 110 are radially guided at equal intervals. The cutting portion 230 may be connected to the rail 140 and cut while moving the cutting portion 230 at a plurality of positions at the same time. As a result, the cutting portion 230 can be divided and cut simultaneously, so that the cutting time can be greatly shortened.

As in the embodiment of the present invention, by fixing the drill bit 120 to the drill 110 and performing rotary cutting, the drilling/cutting dust is discharged in a loose state, so that the work can be performed without scattering dust. As a result, problems such as dust scattering and noise can be avoided.

FIG. 7: is a figure which shows the state in which the cutting trace became circular.
As shown in FIG. 7, when the sandwiching portion 133 makes one round around the guide rail 140, the drill 110 also makes one round while cutting the concentric cutting portion 230, and eventually an annular cutting trace 231 can be formed.

In addition, when cutting a large-diameter sewer pipe, the inner diameter of the guide rail 140 can be increased, but the inner diameter of the guide rail 140 is smaller than the manhole opening and can be carried into the manhole. By increasing the length of the support column 132 included in the support fitting 130, it is possible to cut an arbitrary cutting portion that is a concentric circle. That is, by adjusting the length of the column 132, it is possible to cut the connection outer peripheral portion of any large-diameter sewer pipe.

When the inner diameter of the guide rail 140 is increased to accommodate the guide rail 140, the guide rail 140 may be divided to have a shape to be assembled in the manhole 200.

FIG. 8 is a diagram showing a state after the cutting is completed and the cutting device is removed.
As shown in FIG. 8, a cutting mark 231 can be formed on the outer periphery of the joint portion 210 between the manhole 200 and the sewer pipe 300 to form a gap that divides the manhole 200 and the sewer pipe 300.

Further, as can be seen from FIG. 8, the center axis R of the guide rail 140 and the center axis r of the sewer pipe 300 are set to be coaxial, but if they are substantially coaxial, there is no problem even if some deviation occurs. An annular cutting trace 231 can be formed in the joint portion 210, and the sewer pipe 300 and the manhole 200 can be separated.

FIG. 9 is a diagram showing another state in which the seismic resistant member is inserted into the formed gap.
As shown in FIG. 9, a seismic resistant member 400 is inserted in the gap between the formed annular cutting marks 231. Although it was possible to divide the manhole 200 and the sewer pipe 300 by forming a gap with the cutting trace 231, the problem of water leakage occurs in this state. Therefore, the problem of water leakage can be avoided by inserting the seismic resistant member 400 into the cutting mark 231 and finishing the exterior with mortar.

By the above, the manhole and the sewer pipe 300 connected to the manhole are completely separated, and a structure with seismic reinforcement can be formed.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The seismic resistant structure of the present embodiment is almost the same as the structure shown in the first embodiment except that the size of the guide rail is different. Therefore, components similar to those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted as appropriate.

FIG. 10 is a side view showing the configuration of the cutting device according to the second embodiment.
As shown in FIG. 10, the cutting device 100 includes a drill 110, a drill bit 120, a support fitting 130, a guide 145, and a fixing fitting 150.

The guide 145 has a shape in which a plurality of legs extend radially around the center axis R, and the inner longitudinal direction of the sewer pipe 300 and the center axis r of the sewer pipe 300 and the center axis R of the guide 145 are coaxial. The guide 145 is supported by the fixing bracket 150 so as to face upward.

The fixing bracket 150 includes a support 151 and a seat 152, and the guide 145 is fixed inside the sewer 300 by the support 151 and the seat 152 radially provided toward the side wall 310 of the sewer 300. Has been done. The guide 145 can be fixed to the inside of the sewer pipe 300 by adjusting the length of the fixing metal fitting by the seat portion 152 and the column 151 and stretching the guide 145 inside the sewer pipe 300. The position of the central axis R of the guide 145 can be adjusted by adjusting the length of the fixing bracket by the seat 152 and the column 151.

A support fitting 130 is connected to one end of the guide 145 on the joint section 210 side in a direction perpendicular to the sewer pipe 300. The support fitting 130 has a structure capable of rotating around a connecting portion with the guide 145.

The support fitting 130 includes a fixed portion 131, a support 132, and a balance weight 134. The center of the rod-shaped support column 132 is connected to the guide 145 and driven by the motor 500, so that the support column 132 turns.

A fixing bracket 131 is fixed to one end of the support column 132 in the vertical direction with respect to the supporting column 132, and the drill 110 is connected to the fixing support 131 so that the drill 110 can move along the fixing bracket 131. ..

Further, a balance weight 134 is attached to the other end of the support column 132, and the fixing bracket 131 and the drill 110 attached to one end have a role of balancing during turning. However, the balance weight 134 is not indispensable, and it is possible to appropriately attach the balance weight 134 or select the weight of the balance weight 134 or the like depending on the situation of the site.

FIG. 11 is a front view showing the configuration of the cutting device according to the second embodiment.
The guide 145 is installed inside and at the center of the sewer pipe 300, and by turning the support fitting 130 around the guide 145, the drill 110 attached to one end of the support fitting 130 has a cutting portion 230 at the joint 210. You can move on.

By driving the drill 110 while rotating the support fitting 130 in this manner, the drill bit 120 can cut the cutting portion 230 in the joint portion 210.

In the present embodiment, the drill 110 is provided on only one of the columns 132 and the balance weight 134 is provided on the other end, but the drill 110 may be provided at both ends to cut the cutting time in half.

Further, since the plurality of drills 110 can be attached by providing the support brackets 130 radially with the plurality of columns 132, it is possible to significantly reduce the cutting time.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. The seismic resistant structure of the present embodiment is almost the same as the structure shown in the first embodiment except that the guide rail installation method is different. Therefore, components similar to those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted as appropriate.

FIG. 12 is a side view showing the configuration of the cutting device according to the third embodiment.
As shown in FIG. 12, the guide rail 140 is fixed to the joint portion 210 by a fastener 146, such as an anchor bolt, on the outer surface of the side wall 310 on the surface of the joint portion 210 of the sewer pipe 300.

The guide rail 140 can be divided and carried into the manhole 200, and can be assembled inside the manhole 200 to accommodate the large-diameter sewer pipe 300.

The support fitting 130 is connected to the guide rail 140 and can move along the guide rail 140.

A drill 110 is provided at one end of the support fitting 130, and the drill bit 120 attached to the drill 110 can cut the cutting portion 230 as the support fitting 130 moves on the guide rail 140.

When the guide rail 140 is installed outside the cutting portion 230, the drill 110 is installed toward the center of the sewer pipe 300 through the support fitting 130, and the guide rail 140 is installed inside the cutting portion 230. Can attach the drill 110 through the support fitting 130 toward the outside of the sewer pipe 300 to cut the cutting portion 230.

In the present embodiment, the split semi-arc guide rails 140 are combined to install the annular guide rail 140 in the joint portion 210. However, for example, the rectangular split guide rails 140 are combined to join the polygonal guide rails 140 to each other. The present invention is not limited to this, such as being installed in the section 210, and may be in various modes.

FIG. 13 is a top view showing a method of installing the guide rail according to the third embodiment.
As shown in FIG. 13, the side surface of the manhole 200 is not limited to a flat surface but may be a curved side wall.

If the guide rail 140 is installed when the side surface of the manhole 200 has a curved surface, the clearance member 600 is inserted between the guide rail 140 and the manhole 200, and the guide rail 140 is installed so as to be perpendicular to the sewer pipe 300. It is desirable to do.

As described above, by installing the guide rail 140 vertically to the sewer pipe 300, the drill 110 and the drill bit 120 can be installed parallel to the sewer pipe 300. Because of this, since it is possible to cut parallel to the sewer pipe 300, the sewer pipe 300 and the manhole 200 can be divided without refraction.

As described above, by utilizing the present invention, the joint portion between the manhole and the large diameter sewer pipe can be easily cut and divided without the need for a large core drill.

Further, since the present invention does not perform the hanging work, it is possible to prevent noise and dust scattering.
Then, by automating the cutting work, it is possible to significantly reduce the number of steps in which a person works in the manhole. That is, by using the cutting device of the present invention in the step of performing seismic reinforcement of the sewer pipe, it is possible to reduce health damage due to dust scattering, odor, gas, etc.

100 cutting device 110 drill 120 drill bit 130 support metal fitting 131 fixed part 132 support post 133 sandwiching part 134 balance weight 140 guide rail 145 guide 146 fastening tool 150 fixing metal fitting 151 post 152 seat part 200 manhole 210 joint part 230 cutting part 231 cutting trace 300 sewer pipe 310 side wall 400 seismic resistant member 500 motor 600 gap material R, r center axis

Claims (13)

In a cutting device for forming a gap in the joint between the existing manhole and the sewer pipe,
A shaking prevention part fixed to the side wall of the sewer or the side wall of the manhole,
Cutting means connected to the shaking prevention part and moved along the joint part, and the gap formed in the joint part is continuously cut in the groove direction of the gap;
A support portion in which the cutting means and the shaking prevention portion are connected,
A cutting device comprising: The shaking prevention unit,
The cutting device according to claim 1, wherein the cutting device is a guide rail. The guide rail is
The cutting device according to claim 2, wherein the cutting device is annular. The guide rail is
The cutting device according to claim 2, wherein the cutting device is divisible. The support is
The cutting device according to claim 2, further comprising a moving unit that can move on the guide rail. The moving means is
A prime mover for moving the support on the guide rail,
A control device for controlling the prime mover;
The cutting device according to claim 5, further comprising: The guide rail is
The cutting device according to claim 2, wherein the cutting device is installed on an inner wall surface of the sewer pipe. The guide rail is
The cutting device according to claim 2, wherein the cutting device is installed on a side surface of the manhole. The gap between the guide rail and the side surface of the manhole is
9. The cutting device according to claim 8, wherein a gap material is inserted. A central axis line of the sewer prevention unit in the longitudinal direction of the sewer pipe,
The central axis in the longitudinal direction of the sewer pipe,
The cutting device according to claim 1, wherein the cutting device is installed coaxially. The cutting means is
The cutting device according to claim 1, comprising a rod-shaped cutting tool, a cutting blade provided on a peripheral surface of the cutting tool, and capable of cutting in a direction perpendicular to a longitudinal direction of the cutting tool. The cutting tool is
The cutting device according to claim 11, wherein a cutting blade is provided at a tip end of the cutting device so that it can be punched. In the cutting method of forming a gap in the joint between the existing manhole and the sewer pipe,
An anti-sway part is fixed to the side wall of the sewer pipe or the side wall of the manhole;
Cutting means is connected to the anti-sway part through a support part,
A step in which the cutting means moves along the shaking prevention portion and continuously cuts the gap formed in the joint portion between the manhole and the sewer pipe in the groove direction of the gap;
A cutting method comprising:

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