JP2009133104A - Method and device for cutting bolt for fixing lid receiving frame of manhole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately and efficiently cut a fixing bolt for fixing a lid receiving frame 12 of a manhole 11. <P>SOLUTION: A drill 27 of a cutter 23 is positioned in accordance with an anchor bolt 13 in the manhole in a state in which the axis X of the rotation of the drill 27 is directed in the radial direction of the manhole 11, and the cutter 23 is moved in the direction of the axis X of the rotation of the drill 27. Thus, the drill 27 is propelled toward the anchor bolt 13 from an inner peripheral surface of the manhole 11, so as to cut the anchor bolt 13 while opening a radial hole in the manhole 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cutting method and apparatus for cutting a fixing bolt planted at an upper end portion of a manhole in order to fix a lid receiving frame.

The manhole is a vertical hole connected to a sewer pipe in the ground or a horizontal hole for cable wiring. A lid receiving frame is fixed to an upper end of the manhole, and a manhole cover for closing the upper end opening of the manhole is fitted into the lid receiving frame.
On the upper end surface of the manhole, a plurality of anchor bolts for fixing the lid receiving frame are implanted in the circumferential direction. The lid receiving frame is provided with a flange portion in which a hole for inserting an anchor bolt is formed. The lid receiving frame is installed at the upper end of the manhole with the anchor bolt inserted through the hole of the flange portion, and is fixed to the manhole by fastening a nut to the tip of the anchor bolt. Moreover, the flange part and the anchor bolt are covered with pavement.

The manhole cover frame may be replaced due to damage or aging, and may be raised or lowered according to the road surface during road repair work. When performing these operations, it is necessary to make it easy to remove the lid receiving frame from the road surface by unfixing the manhole and the lid receiving frame with anchor bolts.
As a method for releasing the fixing of the manhole and the lid receiving frame with the anchor bolt, Patent Document 1 discloses that the position of the anchor bolt is searched by ultrasonic waves from the inner peripheral side of the lid receiving frame, and the pavement covering the anchor bolt is formed with a core boring device. A technique is disclosed in which a hole is drilled from above and a nut is removed from an anchor bolt exposed by the drilling.
Further, Patent Document 2 discloses a technique for releasing the fixation between the manhole and the lid receiving frame by horizontally cutting the fixing bolt from the inner peripheral surface of the manhole.
JP 2001-172959 A JP-A-2005-290768

  In the technique of Patent Document 1, the anchor bolt is searched from the inner peripheral side of the lid receiving frame, whereas the hole for exposing the anchor bolt is formed vertically from the road surface of the embedded lid receiving frame. Therefore, it is difficult to match the position of the searched anchor bolt. The technique of Patent Document 1 is a method in which the position of the anchor bolt in the circumferential direction of the manhole can be specified by searching for the anchor bolt, but the position in the radial direction cannot be specified. There is a possibility that. Furthermore, there is a drawback that it is very troublesome to expose the anchor bolt and then to remove the nut.

  On the other hand, in the technique of Patent Document 2, since the anchor bolt is cut horizontally from the inner surface of the manhole, the position of the anchor bolt searched from the inner peripheral side of the lid receiving frame and the cutting position may be misaligned. There is little, and it is not necessary to remove a nut, and it can transfer to the removal work of a lid receiving frame immediately after that. However, in the technique of Patent Document 2, a large-diameter circular cutter that rotates around the vertical axis is used to cut the anchor bolt. From the inner peripheral side of the manhole to the radial direction until the anchor bolt is reached, It will cut deeply, and at the same time, it will cut large in the circumferential direction. That is, in order to cut an anchor bolt having a diameter of about several tens of millimeters, it is necessary to cut several tens of millimeters or more in the radial direction from the inside of the manhole. In addition, the load on the circular cutter by cutting horizontally from the inner surface of the manhole, in particular, the bending moment applied to the rotating shaft of the circular cutter increases, and the diameter of the circular cutter increases according to the cutting depth. Therefore, it is difficult to realize the technology. Note that Patent Document 2 does not disclose what mechanism is used to move the circular cutter and cut the anchor bolt.

  An object of this invention is to provide the cutting method and cutting device which can cut | disconnect the fixing bolt which fixes the lid receiving frame of a manhole accurately and efficiently.

The present invention is a cutting method for cutting a lid receiving frame fixing bolt planted at the upper end of a manhole,
In a state where the rotation axis of the drill of the cutting machine that drills holes by propelling in the direction of the rotation axis is oriented in the radial direction of the manhole, the drill is positioned according to the position of the lid receiving frame fixing bolt in the manhole,
By moving the cutting machine in the direction of the rotation axis of the drill, the drill is propelled from the inner peripheral surface of the manhole toward the lid receiving frame fixing bolt, and the lid is formed while making a radial hole in the manhole. The receiving frame fixing bolt is cut.

Further, the present invention is a cutting device for cutting a lid receiving frame fixing bolt planted at the upper end of a manhole,
A cutting machine equipped with a drill for drilling holes by propulsion in the direction of the rotational axis;
A support for positioning the drill in accordance with the position of the fixing bolt in the manhole, with the rotation axis of the drill oriented in the radial direction of the manhole;
A moving mechanism for moving the cutting machine to propel the drill in the direction of the rotation axis;
It is characterized by having.

  The cutting method and the cutting apparatus of the present invention use a cutting machine equipped with a drill that drills holes by propulsion in the direction of the rotational axis. The axis of rotation of the drill of this cutting machine is oriented in the radial direction of the manhole, and the drill is positioned in accordance with the position of the lid receiving frame fixing bolt (hereinafter simply referred to as “bolt”) in the manhole, and the cutting machine is By moving in the direction of the rotation axis, the bolt is cut while making a hole in the radial direction from the inner peripheral surface of the manhole toward the bolt. Therefore, the bolt can be efficiently cut without wasting the manhole.

  The moving mechanism of the cutting device includes a screw shaft disposed in parallel with a direction of a rotation axis of the drill, a nut member fixed to the cutting machine and screwed to the screw shaft, and the screw shaft It can comprise by the screw feed mechanism which has the rotation operation part rotated around the center. As a result, the drill can be accurately propelled in the direction of the rotation axis, and the bolt can be reliably cut. Moreover, since the cutting machine can be moved little by little by the screw feed mechanism, the manhole is not cut unnecessarily.

  It is preferable that the cutting device further includes a turning mechanism for turning the cutting machine along an inner peripheral surface of the manhole. Thereby, the drill of a cutting machine can be easily matched with the position of the bolt of multiple places of the circumferential direction.

The swivel mechanism is provided on the support and has a first roller that rotates in contact with the upper end surface of the lid receiving frame, and a second roller that rotates in contact with the inner peripheral surface of the lid receiving frame. It can be set as the structure which has these. This makes it possible to easily turn the cutting machine via the first and second rollers. Further, the height of the drill with respect to the lid receiving frame can be determined by contacting the first roller with the upper end surface of the lid receiving frame, and the second roller with respect to the inner peripheral surface of the lid receiving frame can be determined with respect to the lid receiving frame. The position of the cutting device in the radial direction (horizontal direction) can be determined.
Moreover, it is preferable that the cutting device further includes a lock mechanism that locks the turning of the cutting machine.

  The cutting device preferably includes a gauge for specifying the position of the lid receiving frame fixing bolt with reference to a predetermined position in the manhole. The lid receiving frame fixing bolt is often defined in a relative position to a structure in the manhole, for example, a step. Therefore, by providing a gauge so that the position of the lid receiving frame fixing bolt can be specified based on the position of the step or the like, the position of the lid receiving frame fixing bolt is appropriately specified without using a position detection sensor such as an ultrasonic wave. be able to.

  According to the present invention, the lid receiving frame fixing bolt can be cut efficiently and accurately.

FIG. 1 is a front view of a cutting device according to an embodiment of the present invention, and FIG. 2 is a plan view of the cutting device. The cutting device 10 is used to cut an anchor bolt (lid receiving frame fixing bolt) 13 that fixes a lid receiving frame 12 installed at the upper end of a manhole 11.
The manhole 11 includes a cylindrical manhole block 14 made of precast concrete, and a ring member 15 for height adjustment provided concentrically on the upper surface of the upper end opening of the manhole block 14. The lid receiving frame 12 is provided concentrically on the upper side of the ring member 15. In addition, an iron disk-shaped manhole cover (not shown) is detachably fitted into the cover receiving frame 12.

Anchor nuts 17 are embedded at a plurality of locations in the circumferential direction on the upper end surface of the manhole block 14, and anchor bolts 13 are screwed into the anchor nuts 17. The anchor bolt 13 protrudes upward from the upper end surface of the manhole block 14 and further protrudes upward from the upper end surface of the ring member 15 through a hole formed in the ring member 15. The anchor bolts 13 are provided at regular intervals (120 ° intervals or 90 ° intervals), for example, at three or four locations in the circumferential direction.
The lid receiving frame 12 is made of cast iron, and includes a cylindrical portion 18 and a flange portion 19 projecting radially outward from the lower end of the cylindrical portion 18. Bolt insertion holes 20 through which the anchor bolts 13 are inserted are formed in the flange portion 19. The lid receiving frame 12 is fixed to the manhole 11 by inserting the anchor bolt 13 through the bolt insertion hole 20 of the flange portion 19 and fastening the fixing nut 21 to the upper end of the anchor bolt 13.

  The cutting device 10 includes a cutting machine 23 that cuts the anchor bolt 13, a support 24 that supports the cutting machine 23, and a moving mechanism 25 that moves the cutting machine 23 in a predetermined direction. The cutting machine 23 includes a cutting machine body 26 and a drill 27 that is rotationally driven by the cutting machine body 26. The cutting machine body 26 drives and rotates a drill 27 by a built-in electric motor (not shown). Further, the cutting machine body 26 is configured as a hammer drill capable of hitting by a reciprocating motion in the direction of the rotational axis X in addition to the rotational motion of the drill 27. As the drill 27, a core drill (core bit) formed using diamond, cemented carbide, or the like is used, and can drill a hole in the rotation axis X direction. As the drill 27 of the present embodiment, a drill having a diameter more than twice the diameter of the anchor bolt 13, for example, a diameter of about 35 to 40 mm with respect to the anchor bolt 13 of M16 is used.

  The support 24 is placed on the lid receiving frame 12, and includes a main body frame 29, a roller unit (swivel mechanism) 30, and a lock unit (lock mechanism) 31. As shown in FIG. 2, the main body frame 29 is basically composed of three frame members 32 arranged radially at equal intervals. Each frame member 32 is formed of a flat steel plate or a die steel. The roller unit 30 and the lock unit 31 are provided at the tip of each frame member 32.

FIG. 3 is a side view of the main part of the cutting device 10, and FIG. 4 is a view taken along arrow IV in FIG. The roller unit 30 includes first and second rollers 34 and 35 attached to the distal end portion of each frame member 32 via a mounting bracket 33. The first and second rollers 34 and 35 are incorporated adjacent to each other in the vertical direction, and both can rotate around an axis in the vertical direction. The first roller 34 has a larger diameter than the second roller 35, and is incorporated above the second roller 35.
The support 24 has the lower surface of the outer peripheral portion of the first roller 34 brought into contact with the upper end surface of the cylindrical portion 18 of the lid receiving frame 12, and the outer peripheral surface of the second roller 35 is brought to the inner peripheral surface of the cylindrical portion 18. By being brought into contact therewith, it is placed on the lid receiving frame 12. As shown in FIGS. 1 and 2, the center of the support 24 and the center O of the lid receiving frame 12 are configured to coincide with each other.

  A turning handle 36 is attached to the upper surface of the mounting bracket 33. When the turning handle 36 is held and an operating force around the center O is applied, the first and second rollers 34 and 35 that are in contact with the lid receiving frame 12 rotate, and the support 24 turns around the center O. . Thereby, the support body 24 can be easily turned with a light force. Here, the first and second rollers 34 and 35 and the turning handle 36 of the roller unit 30 turn the support 24 and the cutting machine 23 supported by the support 24 along the inner peripheral surface of the lid receiving frame 12. A turning mechanism is configured.

  FIG. 5 is an enlarged side view showing the lock unit 31. The lock unit 31 is used to position and fix the support 24 at a predetermined turning position, and includes a support bracket 37 attached to the distal end portion of each frame member 32 and a clamp tool 38 attached to the support bracket 37. ing. The clamp tool 38 moves the handle member 39 up and down to move the pressing member 42 back and forth via the toggle mechanism 41 to enter a locked / unlocked state. The pressing member 42 is arranged so as to protrude and retract in the radial direction toward the inner peripheral surface of the lid receiving frame 12. When the pressing member 42 advances outward in the radial direction, the pressing member 42 contacts the inner peripheral surface of the cylindrical portion 18 of the lid receiving frame 12. Touch and lock. It is preferable to provide an elastic member such as rubber that can be elastically deformed in accordance with the shape (for example, taper shape) on the inner peripheral surface of the cylindrical portion 18 at the distal end portion of the pressing member 42. As the clamp tool 38, a commercially available toggle clamp can be used.

As shown in FIG. 3, a cutting machine 23 is supported on the lower surface of one frame member 32 of the main body frame 29 via a moving mechanism 25. As described above, when the support 24 is placed on the lid receiving frame 12, the drill 27 has its rotational axis X facing the radial direction of the manhole 11, and slightly below the lid receiving frame 12 (downward by about 5 mm to 30 mm). The anchor bolt 13 is positioned at a height corresponding to a midway portion in the height direction (longitudinal direction).
The moving mechanism 25 includes a screw shaft 44 disposed in parallel with the rotation axis X of the drill 27, a nut member 45 screwed into the screw shaft 44, and a rotation operation unit 46 that rotates the screw shaft 44. is doing. The screw shaft 44 is rotatably supported on the lower surface of the frame member 32 via a support member 47. The nut member 45 is fixed to the cutting machine 23 via a fixing bracket 48.
The rotation operation unit 46 includes a vertical operation shaft 49 supported by the frame member 32, a gear mechanism (interlocking mechanism) 50 provided between the operation shaft 49 and the screw shaft 44, and an upper end of the operation shaft 49. And an operation handle 51 provided on the main body. The gear mechanism 50 includes a first bevel gear 52 fixed to one end portion of the screw shaft 44 and a second bevel gear 53 fixed to the lower end portion of the operation shaft 49 and meshing with the first bevel gear 52. Has been.

  When the operator rotates the operation handle 51 with his hand, the rotation of the operation shaft 49 is transmitted to the screw shaft 44 through the gear mechanism 50, and the nut member 45 moves along the screw shaft 44 by the rotation of the screw shaft 44. To do. Since the screw shaft 44 and the rotation axis X of the drill 27 are arranged in parallel, when the nut member 45 moves along the screw shaft 44, the cutting machine 23 moves in the direction of the rotation axis X of the drill 27. .

  6 is a cross-sectional view taken along the line VI-VI in FIG. As shown in FIGS. 3 and 6, a mounting plate 55 is fixed to the frame member 32, and a pair of regulating members 56 are fixed to the left and right sides of the mounting plate 55 by bolts or the like. The pair of restricting members 56 are disposed so as to sandwich the nut member 45 therebetween, and restrict the cutting machine 23 from rotating around the screw shaft 44.

  In this embodiment, since the cutting machine 23 is supported by the support 24 via the screw shaft 44 of the moving mechanism 25, the moving mechanism 25 also functions as the support 24. However, for example, it is also possible to employ a configuration in which one or a plurality of rails parallel to the rotation axis X of the drill 27 are provided on the support 24 and the cutting machine 23 is movably supported by the rails. In this way, a load in the bending direction is not applied to the screw shaft 44, and the nut member 45 can be moved smoothly.

The operation of the cutting apparatus 10 of the present embodiment having the above configuration will be described.
In removing the lid receiving frame 12 from the manhole 11 for replacement or repair, the support 24 of the cutting device 10 is placed on the lid receiving frame 12 as shown in FIG. Next, as shown in FIG. 2, in order to align the drill 27 of the cutting machine 23 in the direction of the anchor bolt 13, the support 24 is centered O so that the anchor bolt 13 is positioned on the rotation axis X of the drill 27. The swivel positioning is performed around the support unit 24, and the swiveling of the support 24 is locked by the clamp tool 38 of the lock unit 31. The position of the anchor bolt 13 is specified in advance by searching from the inner peripheral side of the manhole 11 with a reinforcing bar (metal) probe using ultrasonic waves. In addition to ultrasonic waves, the position of the anchor bolt 13 may be specified by an electromagnetic probe or the like. Further, the position of the anchor bolt 13 may be searched not only from the inner peripheral side of the manhole 11 but also from the upper side of the pavement on the upper surface of the lid receiving frame 12 downward.

  Next, the cutting machine 23 is driven, and the operation handle 51 of the moving mechanism 25 is operated to propel the drill 27 in the direction of the rotation axis X. Then, the anchor bolt 13 is cut while drilling the ring member 15 of the manhole 11 in the radial direction by the drill 27. The reaction force generated when the manhole 11 is drilled is that the two second rollers 35 arranged behind the cutting machine 23 (in the counter-cutting hole direction) come into contact with the inner peripheral surface of the lid receiving frame 12. Supported by.

After cutting one anchor bolt 13, the lock by the lock unit 31 is released, the support 24 is turned around the center O via the roller unit 30, and the drill 27 is adjusted to the position of the other anchor bolt 13. And operation similar to the above is repeated and all the anchor bolts 13 are cut | disconnected.
When all the anchor bolts 13 are cut, the fixing between the manhole 11 and the lid receiving frame 12 by the bolt is released, so that the lid receiving frame 12 can be easily detached from the upper end of the manhole 11. In order to remove the lid receiving frame 12, the lid receiving frame 12 can be pulled upward together with the surrounding pavement using a conventionally known lid receiving frame pulling device.

  As described above, the cutting device 10 of the present embodiment uses the cutting machine 23 provided with the drill 27 that drills holes by propelling in the direction of the rotational axis X, and propels the drill 27 in the radial direction of the manhole 11. The anchor bolt 13 is cut while drilling the manhole 11. Therefore, the anchor bolt 13 can be efficiently cut without cutting or drilling the manhole 11 wastefully compared to the case of using a circular cutter as in the method of the prior art (Patent Document 2). In this embodiment, since a screw feed mechanism is adopted as the moving mechanism 25 of the cutting machine 23, the cutting machine 23 is surely moved straight in the direction of the rotation axis X of the drill 27, and the anchor bolt is not displaced. 13 can be cut. Moreover, since the cutting machine 23 can be moved little by little by the screw feed mechanism, the manhole 11 is not drilled more than necessary.

  Since the cutting device 10 according to the present embodiment includes a roller unit that turns the support 24 and the cutting machine 23 along the inner peripheral surface of the lid receiving frame 12, the position of the drill 27 can be easily changed to the plurality of anchor bolts 13. Can be adapted to. The roller unit 30 not only facilitates the turning of the cutting machine 23, but the first roller 34 has a function of determining the height of the cutting machine 23, and the second roller 35 is provided with the lid receiving frame 12. It also has a function of determining the radial position with respect to.

  Fig.7 (a) is a top view of the principal part of the main body frame 29 which concerns on other embodiment of this invention, FIG.7 (b) (c) is the same sectional drawing. The lid receiving frame 12 of the manhole 11 has a plurality of types such as φ600, φ750, and φ900 depending on the aperture size. In the present embodiment, the frame member 32 of the main body frame 29 is provided with an expansion / contraction structure so that the length of the frame member 32 can be made variable and can correspond to the aperture size of the lid receiving frame 12. Specifically, the frame member 32 is configured by two divided members 57A and 57B, and each of the divided members 57A and 57B is formed by a plurality of (four) fixing bolts 58 in a state where the ends are overlapped with each other. It is fixed. Each of the divided members 57A and 57B has six bolt holes 59 formed in two rows. By changing the combination of the bolt holes 59 of the divided members 57A and 57B, the state shown in FIG. The length of the frame member 32 can be changed to the state shown in FIG.

  FIGS. 8A and 8B are cross-sectional views of main parts of a main body frame 29 according to still another embodiment of the present invention. In this embodiment, similarly to the above, the frame member 32 is provided with an expansion / contraction structure so as to correspond to the cover receiving frames 12 of a plurality of sizes, and the length of the frame member 32 is variable. The frame member 32 shown in FIG. 8 is, for example, channel steel, and is constituted by two divided members 60A and 60B. Each divided member 60A, 60B is sandwiched between two clamping plates 61, and is fixed by a plurality of fixing bolts 62 penetrating them. A plurality of bolt holes 63, 64 larger than the number of fixing bolts 62 are formed in the holding plate 61 and the divided members 60A, 60B at an equal pitch, and the combination of the holding plate 61 and the bolt holes 63, 64 of the divided members 60A, 60B. By changing the length, the length of the frame member 32 can be changed between the state shown in FIG. 8A and the state shown in FIG.

  When the length of the frame member 32 is variable as shown in FIGS. 7 and 8, it is necessary to change the attachment position of the moving mechanism 25 attached to the frame member 32. For example, FIG. As shown, this can be dealt with by adjusting the mounting position of the support member 47 that supports the screw shaft 44.

  FIG. 9 is a side view showing another embodiment of the lock unit 31. The lock unit 31 includes a suction member 66 supported by a support bracket 37 at the distal end portion of the frame member 32. The attracting member 66 is configured such that the attracting surface 67 is attracted to the inner peripheral surface of the lid receiving frame 12 by a magnetic force, and the turning of the support 24 is locked. Further, the magnetic force of the attracting surface 67 can be switched on and off by a switch 68. A commercially available magnet base can be used as the attracting member 66.

10 and 11 are plan views of a cutting device 10 according to another embodiment of the present invention.
In the above-described embodiment, a metal searcher such as an ultrasonic wave is used to specify the position of the anchor bolt 13 of the manhole 11, but there may be a case where the position cannot be specified accurately by this method. Therefore, the cutting device 10 of the present embodiment is provided with gauges 71 and 72 for specifying the position of the anchor bolt 13.

  The anchor bolt 13 is often positioned in relation to the step 73 provided in the manhole 11. There are about three patterns of this relationship, and the most adopted one is based on the anchor bolt 13A spaced 90 ° clockwise relative to step 73 as shown in FIG. This is a pattern in which other anchor bolts 13B and 13C are arranged at an interval of 120 ° with respect to 13A.

  Accordingly, the cutting device 10 of the present embodiment is provided with the first gauge 71 having an arrow shape with a 90 ° interval in the counterclockwise direction with respect to the drill 27 of the cutting machine 23 so as to correspond to this pattern. On the other hand, an arrow-shaped second gauge 72 is provided at an interval of 120 ° counterclockwise with respect to the drill 27. Therefore, when the first gauge 71 is directed to the center position of step 73, the drill 27 of the cutting machine 23 matches the anchor bolt 13A, and the anchor bolt 13A can be reliably cut. Next, when the second gauge 72 is aligned with the position of the anchor bolt 13A that has already been cut, the drill 27 matches the anchor bolt 13B, and the anchor bolt 13B can be cut. The anchor bolt 13C can also be cut by the same operation.

FIG. 11 is based on the anchor bolt 13A spaced 90 ° counterclockwise with respect to step 73, and the other anchor bolts 13B and 13C are disposed at a spacing of 120 ° with respect to the anchor bolt 13A. Shows the pattern.
Corresponding to this pattern, the cutting device 10 is provided with a first gauge 71 at a 90 ° interval in the clockwise direction with respect to the drill 27 of the cutting machine 23. On the other hand, a second gauge 72 is provided with a spacing of 120 ° counterclockwise with respect to the drill 27. The second gauge 72 may be provided at an interval of 120 ° in the clockwise direction with respect to the drill 27.
With this cutting device 10 as well, all anchor bolts 13A to 13C can be cut in the same procedure as described above.

The 1st gauge 71 can also be comprised so that a change to the position shown in FIG. 10 and the position shown in FIG. 11 is possible. In this case, the position of the anchor bolt 13 can be specified for the manhole 11 having at least two patterns. Further, the gauges 71 and 72 can be configured to be interchangeable so as to correspond to patterns (not shown) other than those in FIGS. 10 and 11.
Note that the main body frame 29 of the cutting apparatus 10 shown in FIGS. 10 and 11 does not have the three frame members 32 arranged at equal intervals (120 ° intervals), and one frame member 32 provided with the cutting machine 23. The distance between the other two frame members 32 is 120 ° or more (specifically, 135 °). Therefore, the reaction force from the cutting machine 23 is more stably received by the second roller 35 provided on the other two frame members 32.

  In the present embodiment, as in the embodiment shown in FIG. 2, it is possible to arrange the three frame members 32 at equal intervals. In this case, one frame member 32 and the second gauge 72 Is an overlapping arrangement. Therefore, the second gauge 72 can be omitted, and the frame member 32 itself can be used as the second gauge.

The present invention is not limited to the embodiment described above, and can be appropriately changed in design.
The support 24 may be configured to position the drill 27 of the cutting machine 23 so that the height can be adjusted. For example, as shown in FIG. 3, the first and second rollers 34 and 35 of the turning mechanism 30 are attached to the attachment bracket 33 so that the vertical position can be adjusted, or the cutting device is attached to the fixed bracket 48. It can be realized by attaching 23 so that the vertical position can be adjusted.

  The moving mechanism 25 is configured to manually operate the operation handle 51, but may be configured to automatically rotate the operation shaft 49 and the screw shaft 44 by an electric motor. Further, the moving mechanism 25 is not limited to the screw feeding mechanism, and a winding / feeding mechanism using a chain or a belt, an expansion / contraction moving mechanism using a cylinder or the like can also be adopted. The locking mechanism is not limited to the above embodiment.

  The main body frame 29 of the support 24 is mainly configured by a plurality of frame members 32 arranged radially, but may be a ring structure arranged along the lid receiving frame 12, for example. In addition, the support 24 is configured to be directly placed on the lid receiving frame 12, but may be configured to be installed on a road surface around the lid receiving frame 12.

  Although the turning mechanism of the above embodiment is configured to turn the entire support 24 around the center O, the support 24 may be fixed and the moving mechanism 25 and the cutting machine 23 may be turned around the center O. .

It is a front view of the cutting device concerning an embodiment of the invention. It is a top view of the cutting device. It is a side view of the principal part of a cutting device. It is IV arrow line view of FIG. It is a side view which expands and shows a lock unit. It is VI-VI sectional drawing of the control member of FIG. (A) is a top view of the principal part of the support body which concerns on other embodiment of this invention, (b) (c) is the same sectional drawing. It is sectional drawing of the principal part of the support body which concerns on other embodiment of this invention. It is a side view which shows other embodiment of a lock unit. It is a top view of the cutting device concerning other embodiments of the present invention. It is a top view of the cutting device concerning other embodiments of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cutting device 11 Manhole 12 Lid receiving frame 13 Anchor bolt (bolt for fixing Lid receiving frame)
23 Cutting Machine 24 Support 25 Moving Mechanism 27 Drill 30 Roller Unit (Swivel Mechanism)
31 Lock unit (lock mechanism)
34 1st roller 35 2nd roller 44 Screw shaft 45 Nut member 46 Rotation operation part 71 1st gauge 72 2nd gauge

Claims (7)

A cutting method for cutting a lid receiving frame fixing bolt planted at the upper end of a manhole,
In a state where the rotation axis of the drill of the cutting machine that drills holes by propulsion in the rotation axis direction is directed in the radial direction of the manhole, the drill is positioned in accordance with the position of the lid receiving frame fixing bolt in the manhole,
By moving the cutting machine in the direction of the rotation axis of the drill, the drill is propelled from the inner peripheral surface of the manhole toward the lid receiving frame fixing bolt, and the lid is formed while making a radial hole in the manhole. A method for cutting a lid receiving frame fixing bolt in a manhole, wherein the receiving frame fixing bolt is cut. A cutting device for cutting a lid receiving frame fixing bolt planted at the upper end of a manhole,
A cutting machine equipped with a drill for drilling holes by propulsion in the direction of the rotational axis;
A support for positioning the drill in accordance with the position of the fixing bolt in the manhole, with the rotation axis of the drill oriented in the radial direction of the manhole;
A moving mechanism for moving the cutting machine to propel the drill in the direction of the rotation axis;
A device for cutting a lid receiving frame fixing bolt in a manhole.   The moving mechanism includes a screw shaft disposed in parallel with a rotation axis direction of the drill, a nut member fixed to the cutting machine and screwed to the screw shaft, and the screw shaft around the axis. 3. A device for cutting a lid receiving frame fixing bolt in a manhole according to claim 2, wherein the cutting device is a screw feed mechanism having a rotation operation section to be rotated.   4. The device for cutting a cover receiving frame fixing bolt in a manhole according to claim 2, further comprising a turning mechanism for turning the cutting machine along an inner peripheral surface of a cover receiving frame of the manhole.   The swivel mechanism is provided on the support and has a first roller that rotates in contact with the upper end surface of the lid receiving frame, and a second roller that rotates in contact with the inner peripheral surface of the lid receiving frame. The device for cutting a lid receiving frame fixing bolt in a manhole according to claim 4.   6. The device for cutting a lid receiving frame fixing bolt in a manhole according to claim 4, further comprising a lock mechanism for locking the turning of the cutting machine.   The device for cutting a lid receiving frame fixing bolt in a manhole according to any one of claims 2 to 6, further comprising a gauge for specifying a position of the lid receiving frame fixing bolt with reference to a predetermined position in the manhole.

Images