JP2020146955A - Punching device and cutting blade assembly - Google Patents

Abstract

To improve working efficiency when the wall face or the like of a concrete structure is annularly cut and punched.SOLUTION: A punching device comprises: a flange member 210 (planar rotary member); arc-shaped cutting blades 222; and a cutting blade holder 221 separating the flange member 210 and the cutting blades 222 in an axial direction of the rotary axis of the flange member 210 with a plurality of planar columnar members 221c arranged so as to face a direction crossed with the circumferential direction in the rotation of the flange member 210 and performing connection.SELECTED DRAWING: Figure 2

Description

The present invention relates to a drilling device for drilling a wall surface of a concrete structure having an opening such as a manhole buried in the ground by cutting it in an annular shape from the inside, and a cutting blade.

In order to make the connection between the manhole buried in the ground and the pipe connected to it flexible, a drilling device called a core cutter or the like is used to cut the wall surface of the manhole or the like in an annular shape from the inside. May be pierced. Further, in order to increase the width of the cutting region, that is, the difference between the outer diameter and the inner diameter of the annular cutting region, a technique for sequentially using an annular or arcuate cutting blade having different inner diameters and outer diameters from each other is used. Has been proposed (see, for example, Patent Documents 1 and 2).

Japanese Patent No. 5895249 Japanese Patent No. 6171071

However, in order to sequentially use cutting blades having different inner and outer diameters as described above, cutting time is required for each cutting blade, and time and work for replacing the cutting blade are also required. It is not easy to improve work efficiency.

The present invention has been made in view of the above points, and an object of the present invention is to make it possible to easily improve the cutting work efficiency when cutting a wall surface or the like of a concrete structure in an annular shape.

To achieve the above objectives
The first invention is
A drilling device that cuts an annular region consisting of an outer diameter and an inner diameter having the same rotation center on the wall surface of the concrete structure from the inner side of the concrete structure having an opening.
Plate-shaped rotating member and
Arc-shaped cutting blade and
The plate-shaped rotating member has a plurality of plate-shaped pillar members arranged so as to face a direction intersecting the circumferential direction in the rotation of the plate-shaped rotating member, and the plate-shaped rotating member and the cutting blade are combined with the plate-shaped rotating member. A cutting blade holder that is separated and connected in the axial direction of the rotation axis of
It is characterized by being equipped with.

As a result, the cutting blade is formed in an arc shape, the cutting load can be easily reduced, and the pillar members of the cutting blade holder are arranged as described above, so that the cutting blade can be reliably supported. Therefore, the width of the cutting blade can be set large to improve the cutting work efficiency.

In the present invention, work efficiency can be easily improved.

It is a side view which shows the schematic structure of the drilling device. It is a front view which shows the structure of the cutting blade unit. It is a front view which shows the detailed structure of a cutting blade holder. It is a front view which shows the detailed structure of a cutting blade. It is a top view which shows the detailed structure of a cutting blade assembly.

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

(Structure of drilling device 100)
As shown in FIG. 1, for example, the drilling device 100 is carried into the manhole 300 and drills by cutting the connection portion of the side wall 301 of the manhole with the vicinity of the ends of the sewer pipes 302 and 303 in an annular shape. Used for.

The drilling device 100 includes a horizontal frame 110 installed in the direction in which the sewer pipe 302 extends, and a rotary drive unit 120 slidably guided by the horizontal frame 110. The horizontal frame 110 supports the entire device by, for example, being stretched inside the side wall 301 of the manhole 300 via a batten 201 by the extension force of the hydraulic cylinder 111 composed of the cylinder 111a and the piston rod 111b. Further, the rotary drive unit 120 is adapted to move in the extending direction of the sewer pipe 302 as the cutting progresses, for example, by the hydraulic cylinder 121 composed of the cylinder 121a and the piston rod 121b.

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

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

(Structure of cutting blade unit 200)
As shown in FIGS. 2 to 5, the cutting blade unit 200 includes a flange member 210 (plate-shaped rotating member) attached to the rotating flange 122 of the rotary driving unit 120 by bolts or the like, and a cutting blade assembly 220. Has been done.

The flange member 210 is configured such that a pair of semi-disk-shaped partial flanges 211 can be folded by the hinge member 212. A cutting blade assembly 220 as described in detail below can be detachably fixed to the flange member 210 by bolts 231. The outer shape of the flange member 210 is not necessarily limited to the circular shape as shown in FIG. 2, and in the figure, the shape excluding the portion protruding to the left and right from the cutting blade assembly 220, that is, the ends of the pair of cutting blade assemblies 220. The shape may be such that a part outside the predetermined string, such as a string connecting the parts, is removed. However, in the case of a circular shape as shown in the figure, it is possible to easily increase the rigidity and strength to suppress deformation and so-called chatter during cutting. Further, the partial flange 211 is not limited to being foldable by the hinge member 212, and a circular flange member 210 is formed by attaching two or more semicircular or fan-shaped partial flanges to the rotary flange 122. Alternatively, a flange member having a shape in which a portion outside the predetermined string is removed may be formed. In that case, since the flange member can be attached to the rotary flange 122 even after the centering shaft 130 is installed in the manhole 300, for example, the required work space can be reduced to improve workability even in a relatively narrow manhole. It can be improved more easily.

(Structure of cutting blade assembly 220)
In this embodiment, a pair of cutting blade assemblies 220 are provided, and are arranged on the plate surface of the flange member 210 so as to be separated from each other in the circumferential direction. Each cutting blade assembly 220 has an arcuate cutting blade 222 and the cutting blade 222 in the axial direction of the rotation axis of the cutting blade unit 200 with respect to the flange member 210 (direction perpendicular to the paper surface of FIGS. 2 to 4). It has a cutting blade holder 221 that is separated and connected in the vertical direction in FIG.

More specifically, the cutting blade holder 221 has a base plate 221a attached to the flange member 210, a cutting blade support plate 221b for supporting the cutting blade 222, and the base plate 221a and the cutting blade support plate 221b of the cutting blade unit 200. It has a plate-shaped pillar member 221c that is separated and connected in the axial direction of the rotating shaft. The plate-shaped pillar member 221c includes a direction intersecting the circumferential direction in the rotation of the cutting blade unit 200, specifically, for example, the axis of the rotation axis of the cutting blade unit 200, and is formed on a plane crossing the cutting blade 222. They are arranged so as to face parallel and parallel to each other. The base plate 221a, the cutting blade support plate 221b, and the column member 221c are joined by welding, for example.

The cutting blade holder 221 is detachably attached to the flange member 210 by screwing the bolt 231 inserted into the bolt hole 221d formed in the base plate 221a into the female screw formed in the flange member 210. It has become. The method of attaching the cutting blade holder 221 is not limited to the above, and a female screw may be formed on the base plate 221a and bolted from the opposite surface side of the flange member 210. Further, the cutting blade 222 is detachably attached to the cutting blade support plate 221b of the cutting blade holder 221 by a bolt 233 inserted into the bolt hole 221g of the cutting blade support plate 221b.

The cutting blade 222 is formed by providing a large number of bits 222b made of, for example, diamond on a cutting blade base material 222a on which a female screw 222d into which the bolt 233 is screwed is formed. By setting the inner diameter of the cutting blade 222 so that the difference from the outer diameter of the rehabilitation pipe 302b is, for example, 20 mm (10 mm in the radial direction) or more, damage to the rehabilitation pipe 302b can be easily prevented. , The portion of the existing pipe 302a can be easily cut and removed while leaving the portion of the rehabilitation pipe 302b. Further, by setting the outer diameter of the cutting blade 222 to be larger than the outer diameter of the sewer pipe 302, for example, the connection portion between the side wall 301 of the manhole 300 and the sewer pipes 302 and 303 can be made flexible in one cutting process. It is possible to easily perform cutting for such purposes in one cutting process.

Here, although not essential, knock pin holes 221e, 221f, 222c, etc. are formed in the base plate 221a, the cutting blade support plate 221b, the cutting blade base material 222a, etc., and they are attached by inserting the knock pins 232, 234. The accuracy of the position can be easily improved.

(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, by folding the partial flanges 211 and 211 at the hinge member 212, the flange member 210 having an outer diameter approximately twice the inner diameter of the opening of the manhole 300 can be carried into the manhole 300. Further, the arc length (central angle) of the cutting blade assembly 220 (cutting blade 222) is set to such a size that it cannot be carried into the manhole 300 when the cutting blade assembly 220 and the flange member are assembled. Even in this case, the cutting blade assembly 220 and the flange member can be carried into the manhole 300 in a separated state.

Therefore, after the flange member 210 or the like is 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 rotary drive unit 120, and the cutting blade assembly 220 is attached to the flange member 210. Can be configured with a cutting blade unit 200 capable of cutting a region having a diameter larger than the opening of the manhole 300 by attaching the bolt 231 and the knock pin 232.

The side wall 301 can be cut by pressing the cutting blade unit 200 as described above against the side wall 301 of the manhole 300 from the inner peripheral side while rotating the drilling device 100.

Here, since the cutting blade assembly 220 (cutting blade 222) is formed in an arc shape instead of the entire circumference, the cutting load can be easily suppressed to a small value, so that the rotation required for the rotation drive unit 120 While keeping the driving force small, the width of the cutting blade 222, that is, the difference between the inner and outer diameters is set large, and the width of the annular cutting region is relatively wide, that is, the difference between the outer diameter and the inner diameter of the cutting region is compared. Larger cutting can be easily performed, and cutting efficiency can be improved. Therefore, for example, it is possible to easily perform cutting for making the connection portion between the side wall 301 of the manhole 300 and the sewer pipes 302 and 303 flexible in one cutting step.

Further, the plate-shaped pillar member 221c connecting the base plate 221a and the cutting blade support plate 221b is arranged so as to face the direction intersecting the circumferential direction in the rotation of the cutting blade unit 200, as described above. It is easy to reliably support the cutting blade 222 having a relatively wide width. Moreover, clogging of the bit 222b can be easily suppressed by sprinkling water from the outer peripheral side of the cutting blade assembly 220. Further, it is also possible to easily improve the water permeability by preventing the cutting chips and the like from being clogged between the base plate 221a and the cutting blade support plate 221b. In these respects as well, it is possible to facilitate cutting with a relatively wide width as described above. In order to obtain the above effects, the pillar member 221c is arranged so as to include the axis of the rotation axis of the cutting blade unit 200, to be parallel to the plane crossing the cutting blade 222, and to face in a direction parallel to each other. It is not limited to this, but it may be arranged so as to face the radial direction or the like. However, the arrangement parallel to each other is usually easy to manufacture in terms of accuracy and the like. In addition, reinforcing ribs and the like are provided between each pillar member 221c and between the base plate 221a and the cutting blade support plate 221b within a range in which cooling water can be sufficiently circulated and cutting chips are removed. May be good.

As described above, as the cutting blade, instead of a cutting blade covering the entire circumference, an arc-shaped cutting blade having a part of the circumference is used, and the cutting blade holder 221 having the pillar member 221c as described above is used. By supporting the cutting blade 222, the width of the cutting region can be widened and the cutting efficiency can be easily improved.

Further, when the cutting blade is worn or damaged, it can be replaced with a partial cutting blade 222 units or a cutting blade assembly 220 units, so that maintenance cost can be easily reduced.

(Other matters)
The number of divisions of the flange member 210 is not limited to the above, and various settings may be made 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 inner and outer diameters of the cutting blade assembly 220, the length (central angle) of the arc, the number of arrangements on the circumference, the spacing, etc. are not limited to the above, but the inner and outer diameters of the cutting region and the driving force of the rotary drive unit are required. Various settings may be made according to the working time and the like. If the length (central angle) of the arc is too small, the wear of each arc-shaped cutting blade may easily increase. In that respect, it is preferable to set the length to a certain length or more.

Further, in the above example, the side wall of the sewer pipe and the manhole is cut so as to leave the rehabilitation pipe of the sewer pipe having the rehabilitation pipe, but the present invention is not limited to this, and the sewer pipe having no rehabilitation pipe is not damaged. It is also possible to easily cut the side wall of the manhole on the outer peripheral side.

100 Drilling device 110 Horizontal frame 111 Hydraulic cylinder 111a Cylinder 111b Piston rod 120 Rotating drive unit 121 Hydraulic cylinder 121a Cylinder 121b Piston rod 122 Rotating flange 130 Centering shaft 130a Ring stopper 131 Centering device 131a Fitting hole 132 Spacer 133 Camber 134 134a Cylinder 134b Piston Rod 200 Cutting Blade Unit 201 Batten 202 Reaction Force Plate 210 Flange Member 211 Partial Flange 212 Butterfly Member 220 Cutting Blade Assembly 221 Cutting Blade Holder 221a Base Plate 221b Cutting Blade Support Plate 221c Pillar Member 221d Bolt Hole 221d Bolt Hole 221e Knock pin hole 221g Bolt hole 222 Cutting blade 222a Cutting blade base material 222b Bit 222c Knock pin hole 222d Female screw 231 Bolt 232 Knock pin 233 Bolt 234 Knock pin 300 Manhole 301 Side wall 302 Sewer pipe 302a Existing pipe 302b Rehabilitation pipe

Claims (6)

A drilling device that cuts an annular region consisting of an outer diameter and an inner diameter having the same rotation center on the wall surface of the concrete structure from the inner side of the concrete structure having an opening.
Plate-shaped rotating member and
Arc-shaped cutting blade and
The plate-shaped rotating member has a plurality of plate-shaped pillar members arranged so as to face a direction intersecting the circumferential direction in the rotation of the plate-shaped rotating member, and the plate-shaped rotating member and the cutting blade are combined with the plate-shaped rotating member. A cutting blade holder that is separated and connected in the axial direction of the rotation axis of
A drilling device characterized by being equipped with. The drilling device according to claim 1.
A drilling device characterized in that the plurality of plate-shaped pillar members are arranged so as to face directions parallel to each other. The drilling device according to claim 2.
Each of the plurality of plate-shaped pillar members includes the axis of the rotation axis of the plate-shaped rotating member, and is arranged so as to face a direction parallel to a plane crossing the arc-shaped cutting blade. Drilling device. The drilling device according to any one of claims 1 to 3.
The above cutting blade holder
The base plate attached to the plate-shaped rotating member and
A cutting blade support plate that supports the cutting blade and
Have,
The plurality of plate-shaped column members are a drilling device characterized in that the base plate and the cutting blade support plate are connected to each other. The drilling device according to any one of claims 1 to 4.
A drilling device characterized in that the plate-shaped rotating member, the cutting blade holder, and the cutting blade are configured to be detachable from each other. A cutting blade assembly used in the drilling apparatus of claim 1.
With the above arc-shaped cutting blade,
It has a plurality of plate-shaped pillar members arranged so as to face a direction intersecting the circumferential direction in the rotation of the plate-shaped rotating member in the drilling device, and the plate-shaped rotating member and the cutting blade are combined with each other. A cutting blade holder that is separated and connected in the axial direction of the rotating shaft of the plate-shaped rotating member,
A cutting blade assembly characterized by having.

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