JP2018076642A - Boring device and cutting blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge the width of an annular cutting region in a manhole.SOLUTION: A boring device which annularly bores the wall face of a manhole from inside includes a flange member 210 and a rotation driving part for rotating and driving the flange member 210. The flange member 210 is composed so that a plurality of first arcuate cutting blades (arcuate cutting blades 220') each having a partial cylindrical form with an arcuate section, and separately arranged from each other in the circumferential direction on a plate face of the flange member 210, and a plurality of second arcuate cutting blades (arcuate cutting blades 220) having a cutting inside diameter and a cutting inside diameter different from those of the first arcuate cutting blades, each having a partial cylindrical form with an arcuate section, and separately arranged from each other in the circumferential direction on the plate face of the flange member 210, are selectively detachable.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a drilling method in which a wall surface of a concrete structure having an opening, such as a manhole embedded in the ground, is cut into an annular shape from the inner side.

  In order to make a connecting portion between a manhole or the like buried in the ground and a pipe connected to the manhole or the like, the wall surface of the manhole or the like may be perforated by being cut into an annular shape from the inside. In this case, the core cutter that performs the above-described cutting needs to be carried into the inside through the opening of the manhole. Therefore, in order to cut a hole larger than the opening, a technique is known in which a core cutter is carried in a state of being disassembled into a plurality in the circumferential direction, and assembled and cut in a manhole (see, for example, Patent Document 1). .) A technique is also known in which a plurality of arc-shaped cutters are provided so as to be movable in the radial direction, and are carried into a manhole in a reduced diameter state, and then expanded and cut (see Patent Document 2, for example). . Furthermore, a technique using a core cutter corresponding to only a part of the circular arc portion on the circumference having a width that can be carried from the opening is also known (see, for example, Patent Document 3).

JP 2001-329554 A JP 2011-168982 A JP 2012-167504 A

  However, when the core cutter is disassembled into a plurality of pieces in the circumferential direction and assembled in a manhole as described above, or when carried in a reduced diameter state and expanded in the manhole, the outer diameter of the cutting region is increased. Although it is possible, it is difficult to increase the width of the cutting area, that is, the difference between the outer diameter and the inner diameter of the cutting area. This is because, in order to increase the width of the cutting area, it is necessary to increase the driving torque of the apparatus. However, if the apparatus is increased in size, it becomes difficult to carry in from the opening of the manhole.

  The present invention has been made in view of this point, and an object of the present invention is to facilitate cutting with a relatively large width of the annular cutting region.

The present invention
A drilling device for drilling a wall of a concrete structure having an opening from an inner side by cutting it into an annular shape,
A plate-like rotating member;
A rotation drive unit that rotationally drives the plate-like rotation member;
With
The plate-like rotating member is
A plurality of first arcuate cutting blades each having a partial cylindrical shape having an arcuate cross section and arranged circumferentially apart from each other on the plate surface of the platelike rotary member, and the first arcuate cutting The cutting inner diameter and the cutting inner diameter differ from the blade, and each has a partial cylindrical shape with an arc-shaped cross section, and a plurality of second circles that are spaced apart from each other in the circumferential direction on the plate surface of the plate-like rotating member Arc cutting blade
It is configured to be selectively removable.

  As a result, the width of the part to be cut is made smaller than the part to be finally cut, and the cutting load is greatly increased because the arc-shaped cutting blade is formed in an arc shape instead of the entire circumference. Since it can be easily reduced, it is possible to easily perform cutting of a relatively large region with high accuracy with a relatively small rotational torque.

  According to the present invention, it is possible to easily perform cutting with a relatively large width of the annular cutting region.

It is a side view which shows schematic structure of the punching apparatus. It is a front view which shows the structure of the cutting blade unit. It is a top view which shows the detailed structure of a cutting blade. It is a front view which shows the detailed structure of a cutting blade.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Configuration of punching device 100)
For example, as shown in FIG. 1, the perforating apparatus 100 is carried into a manhole 300 and circularly connects the sewer pipes 302 and 303 on the side wall 301 of the manhole and the vicinity of the end portions of the sewer pipes 302 and 303. Used to cut in a ring and drill.

  The perforating apparatus 100 includes a horizontal frame 110 that is installed in the direction in which the sewer pipe 302 extends, and a rotation drive unit 120 that is slidably guided by the horizontal frame 110. The horizontal frame 110 is configured to support the entire apparatus by stretching the inner side of the side wall 301 of the manhole 300 through the batting 201 by the extension force of the hydraulic cylinder 111 including, for example, a cylinder 111a and a piston rod 111b. Further, the rotation drive unit 120 is moved in the extending direction of the sewer pipe 302 with the progress of cutting by a hydraulic cylinder 121 including, for example, a cylinder 121a and a piston rod 121b.

  A cutting blade unit 200 is attached to the rotation drive unit 120 via a rotation flange 122. The cutting blade unit 200 is rotatably and slidably supported by a centering shaft 130 that is a support shaft fixed in the manhole 300, and is rotationally driven by a hydraulic motor (not shown) provided in the rotation driving unit 120. It is like that.

  The centering shaft 130 is inserted into and supported by the fitting hole 131a of the centering device 131 fixed at the tip end thereof by the spacer 132 and the camber 133 (wedge member) in the sewer pipe 302, and the other end portion. The cylinder 134 a and the piston rod 134 b provided in the cylinder are supported and fixed by stretching through the ring stopper 130 a, the batten 201 and the reaction force plate 202 in the manhole 300 by the extension force of the hydraulic cylinder 134. It has become.

(Configuration of cutting blade unit 200)
As shown in FIGS. 2 to 4, the cutting blade unit 200 includes a flange member 210 (plate-shaped rotating member) attached to the rotating flange 122 of the rotation driving unit 120 and an arc-shaped cutting blade 220. Yes.

  The flange member 210 is configured such that a pair of semi-disc-shaped partial flanges 211 can be folded by a hinge member 212. Arc-shaped cutting blades 220 and 220 ′ having different cutting inner diameters and cutting inner diameters can be selectively detachably fixed to the flange member 210 as described in detail below. Note that the outer shape of the flange member 210 is not necessarily circular as shown in FIG. 2, and in the same figure, the shape of the flange member 210 is left out of the arcuate cutting blades 220 and 220 ′, that is, the arcuate cutting blade 220. -You may make it the shape which remove | eliminated a part outside the predetermined string, such as a string connecting the ends of 220 '. However, in the case of a circular shape as shown in the figure, it is possible to easily increase the rigidity and strength and to suppress deformation during cutting and so-called chatter to a small extent. In addition, the partial flange 211 is not limited to be configured to be foldable by the hinge member 212, and a circular flange member 210 is formed by attaching two or more semi-circular or fan-shaped partial flanges to the rotating flange 122. Alternatively, a flange member having a shape in which a portion outside a predetermined string is removed may be configured. In that case, since the flange member can be attached to the rotating flange 122 even after the centering shaft 130 is installed in the manhole 300, for example, the required work space is reduced, and workability is improved even in a relatively narrow manhole. It can be improved more easily.

  In this embodiment, a pair of arcuate cutting blades 220 are provided, and are arranged on the plate surface of the flange member 210 so as to be spaced apart from each other in the circumferential direction. Each arcuate cutting blade 220 has a partial cylindrical shape with an arcuate cross section. Leg portions 221 having bolt holes 222 are provided at both ends in the circumferential direction of the flange member 210 side portion of the arc-shaped cutting blade 220, and are detachably attached to the flange member 210 by bolts 231. The method for attaching the arcuate cutting blade is not limited to the above, and a female screw may be formed at the bottom of the arcuate cutting blade and bolted from the opposite surface side of the flange member 210. Further, although not essential, a knock pin hole 223 is formed in the arc-shaped cutting blade 220, and the accuracy of the attachment position can be easily increased by the knock pin 232. A bit 224 made of diamond, for example, is provided on the end surface of the arcuate cutting blade 220 opposite to the flange member 210. In addition, although not necessarily essential, the arc-shaped cutting blade 220 is formed with an opening 225 penetrating in the radial direction so that the bit 224 can be easily cooled by cooling water, for example. Note that the shape and number of the openings 225 are not limited to those shown in FIG. 4 and may be variously set.

  The arc-shaped cutting blade 220 ′ is configured in the same manner as the arc-shaped cutting blade 220 except that the cutting inner diameter and the cutting inner diameter are different from each other.

(About cutting with the cutting blade unit 200)
By using the cutting blade unit 200 as described above, it is possible to easily cut a region having a diameter larger than the opening (not shown) of the manhole 300. That is, the flange member 210 can carry into the manhole 300 what has an outer diameter about twice the inner diameter of the opening of the manhole 300 by folding the partial flanges 211 and 211 at the hinge member 212. Further, even when the length (center angle) of the arc of the cutting blade 220 is set to a dimension that cannot be carried into the manhole 300 when the cutting blade 220 and the flange member are assembled, the cutting blade 220 and It is also possible to carry in the manhole 300 in a state where the flange member is separated.

  Therefore, after the flange member 210 and the like are carried into the manhole 300, the partial flanges 211 and 211 folded by the hinge member 212 are opened and attached to the rotary flange 122 of the rotation drive unit 120, and the arcuate cutting blade is attached to the flange member 210. By attaching 220 or arcuate cutting blade 220 ′ with bolt 231 and knock pin 232, cutting blade unit 200 capable of cutting an area having a diameter larger than the opening of manhole 300 can be configured.

  Next, a description will be given of the point that cutting is possible with a relatively small driving torque even when the width of the annular cutting region is relatively large, that is, when the difference between the outer diameter and the inner diameter of the cutting region is relatively large.

  In this embodiment, two arcuate cutting blades 220 and 220 'are used. The outer diameter and inner diameter of the portion of the arcuate cutting blade 220 where the bit 224 is provided are set larger than the outer diameter and inner diameter of the portion of the arcuate cutting blade 220 ′ where the bit 224 is provided.

  Therefore, first, the arc-shaped cutting blade 220 ′ is attached to the flange member 210 of the cutting blade unit 200, and the outer peripheral portion of the existing pipe 302 a in the sewer pipe 302 and the surrounding side wall 301 are cut. In this case, the width of the part to be cut is made smaller than the part to be finally cut, and the arc-shaped cutting blade 220 ′ is formed in an arc shape instead of the entire circumference, thereby reducing the cutting load. Since it can be easily reduced significantly, the rotational driving force required for the rotational drive unit 120 can be kept small. Here, by setting the difference between the inner diameter of the arcuate cutting blade 220 ′ and the outer diameter of the renovated pipe 302b to, for example, 20 mm (10 mm in the radial direction) or more, damage to the regenerated pipe 302b can be easily prevented. it can.

  Next, the bolt that fastens the arc-shaped cutting blade 220 ′ is removed, removed from the flange member 210, and replaced with the arc-shaped cutting blade 220, so that the portion of the side wall 301 on the outer peripheral side of the cutting region is changed. To be cut.

  Here, when exchanging the arc-shaped cutting blades 220 and 220 ′, the centering shaft 130 and the centering device 131 are placed in the manhole 300 even when the centering shaft 130 is supported in at least two places. The arc-shaped cutting blade 220 ′ can be removed and the arc-shaped cutting blade 220 can be attached while being fixed. Therefore, since the positional deviation of the rotation center that tends to occur when the centering shaft 130 is re-fixed is difficult to occur, the positional accuracy of the arc-shaped cutting blades 220 and 220 ′ can be easily increased. That is, it is possible to easily perform cutting in a relatively large region with high accuracy with a relatively small rotational torque. Therefore, in particular, it is possible to easily cut and remove the existing pipe 302a while leaving the rehabilitated pipe 302b.

  Moreover, it is possible to easily improve the cutting efficiency by using a part of the circular arc-shaped cutting blade instead of the cutting blade over the entire circumference as the cutting blade. Therefore, especially when the width of the annular cutting region is relatively large, coupled with the use of cutting blades having different diameters as described above, the driving torque required for cutting can be further reduced or the cutting can be performed with the same torque. It is easy to increase the bill. In addition, when the cutting blade is worn or damaged, it can be replaced in units of partial cutting blades, so that it is easy to reduce maintenance costs.

(Other matters)
The number of divisions of the flange member 210 is not limited to the above, and may be variously set according to the size of the opening of the manhole 300, the inner and outer diameters of the cutting region, and the like.

  Further, the number of times of exchanging the arc-shaped cutting blade 220, the inner and outer diameters thereof, the arc length (center angle), the number of arrangement on the circumference, the interval, etc. are not limited to the above, and the inner and outer diameters of the cutting region and the rotational drive What is necessary is just to set variously according to the driving force of a part, the working time calculated | required, etc. FIG. Note that if the arc length (center angle) is too small, wear of each arcuate cutting blade tends to increase, and in this respect, it is preferable that the arc length (center angle) be set to a certain length or more.

  Moreover, although the example which cuts the side wall of a sewer pipe and a manhole so that the rehabilitation pipe of the sewer pipe which has a rehabilitation pipe may be left was shown above, it is not restricted, and the sewer pipe which does not have a rehabilitation pipe may be damaged. The side wall of the outer peripheral manhole can be easily cut.

DESCRIPTION OF SYMBOLS 100 Punching device 110 Horizontal frame 111 Hydraulic cylinder 111a Cylinder 111b Piston rod 120 Rotation drive part 121 Hydraulic cylinder 121a Cylinder 121b Piston rod 122 Rotating flange 130 Centering shaft 130a Ring stopper 131 Centering device 131a Mating hole 132 Spacer 133 Camber 134 Hydraulic cylinder 134a Cylinder 134b Piston rod 200 Cutting blade unit 201 Batting wood 202 Reaction force plate 210 Flange member 211 Partial flange 212 Hinge member 220 Arc-shaped cutting blade 220 'Arc-shaped cutting blade 221 Leg portion 222 Bolt hole 223 Knock pin hole 224 Bit 225 Opening 231 bolt 232 knock pin 300 manhole 301 side wall 302 sewer pipe 302/303 Sewer pipe 302a Existing pipe 302b Rehabilitation pipe 310 Opening

The present invention
A drilling device for drilling a wall of a concrete structure having an opening from an inner side by cutting it into an annular shape,
A plate-like rotating member;
A rotation drive unit that rotationally drives the plate-like rotation member;
With
The plate-like rotating member is
A plurality of first arcuate cutting blades each having a partial cylindrical shape having an arcuate cross section and arranged circumferentially apart from each other on the plate surface of the platelike rotary member, and the first arcuate cutting The blade has a cutting outer diameter and a cutting inner diameter different from each other, and each has a partial cylindrical shape with a circular arc cross section, and is arranged on the plate surface of the plate-like rotating member and spaced apart from each other in the circumferential direction. Arc cutting blade
It is configured to be selectively removable.

Claims (8)

A drilling device for drilling a wall of a concrete structure having an opening from an inner side by cutting it into an annular shape,
A plate-like rotating member;
A rotation drive unit that rotationally drives the plate-like rotation member;
With
The plate-like rotating member is
A plurality of first arcuate cutting blades each having a partial cylindrical shape having an arcuate cross section and arranged circumferentially apart from each other on the plate surface of the platelike rotary member, and the first arcuate cutting The cutting inner diameter and the cutting inner diameter differ from the blade, and each has a partial cylindrical shape with an arc-shaped cross section, and a plurality of second circles that are spaced apart from each other in the circumferential direction on the plate surface of the plate-like rotating member Arc cutting blade
A perforating apparatus configured to be selectively removable. The perforating apparatus of claim 1,
The plate-shaped rotating member has a circular shape or an outer shape from which a part outside the circular predetermined string is removed. The perforating apparatus according to claim 1 or 2,
The plate-like rotating member is constituted by using a plurality of partial plate-like rotating members. The perforating apparatus of claim 3,
The perforating apparatus, wherein the plate-like rotating member is configured such that the plurality of partial plate-like rotating members can be folded via a hinge member. The perforating apparatus according to claim 3 or claim 4,
The plurality of partial plate-like rotating members are each a pair of semi-circular partial plate-like rotating members. A cutting blade which is a first or second arcuate cutting blade used in the drilling device according to any one of claims 1 to 5,
A cutting blade having a partial cylindrical shape each having an arc shape in cross section and configured to be detachable from a plate surface of the plate-like rotating member. The cutting blade according to claim 6,
A cutting blade having an opening penetrating in a radial direction. The cutting blade according to claim 6 or claim 7,
A cutting blade having leg portions capable of attaching the cutting blade to the plate-like rotating member by fastening members at both ends in the circumferential direction on the plate-like rotating member side.

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