JP5269691B2 - Manhole cover edge cutting device - Google Patents

Description

  The present invention relates to a manhole cover edging device for lifting a manhole cover from a receiving frame, releasing the fitted state of the manhole cover from the receiving frame, and cutting the manhole cover from the receiving frame.

  For example, Patent Documents 1 to 3 can be cited as conventional examples of this type of manhole cover edge cutting device.

The edge cutting device of Patent Document 1 includes a rectangular parallelepiped frame assembly installed on a road surface, a device body including a pair of lid lifting mechanisms, and a track device including a rail on which the device body travels. The lid elevating mechanism includes an elevating nut that is rotatably attached to a beam member installed on the frame body and is not movable up and down, and an elevating bolt that is screwed to the elevating nut. The lower end of the lifting bolt is provided with a screw portion that is screwed into the embedded nut embedded in the manhole cover, and the upper end is provided with a handle. The lifting nut is provided with a rotation lever.
In the edge cutting device of Patent Document 1, a frame assembly and a track device are assembled on a road surface so as to surround a manhole cover and a receiving frame at a site, and a lid lifting mechanism is installed in alignment with a nut of the manhole cover. Next, a screw part for rotating the handle is screwed and fixed to the embedded nut, and then the rotary lever is rotated to raise the lifting bolt, and the manhole cover is lifted from the frame and cut off. Finally, by moving the apparatus main body along the rails of the track apparatus, the manhole cover can be moved and placed at a predetermined position.

  The edge cutting device according to Patent Document 2 is provided with a frame-equipped base installed on a road surface, a lid lifting mechanism including a winding handle provided on the base, and a lower end of the lid lifting mechanism to engage with a manhole cover. And a frame having an attached attachment. According to this apparatus, after the attachment is engaged with the manhole cover, the manhole cover can be lifted and trimmed by rotating the winding handle. Further, the manhole cover can be moved to a predetermined position by moving the base together with the frame while the manhole cover is lifted.

  An edge cutting device according to Patent Document 3 includes a placement portion installed on a road surface, a jack mechanism provided on the placement portion, and a lift bar having a key portion that is engaged with an engagement hole of a manhole cover. Prepare. Then, by lifting the lift bar by the jack mechanism, the manhole cover can be lifted and cut off from the receiving frame.

Japanese Patent Laid-Open No. 08-302721 JP 2008-081940 A Utility Model Registration No. 2500909

  According to the edge cutting device according to Patent Documents 1 to 3 as described above, the manhole cover can be reliably lifted and edged from the receiving frame by a manual lid lifting mechanism or jack mechanism, so that the burden on the worker during the edge cutting operation is reduced. can do. However, since the manhole cover is lifted with the road surface surrounding the receiving frame as a fulcrum, the road surface may be damaged. Specifically, when a manhole cover is installed on an asphalt road, the asphalt surface may be damaged, or the asphalt surface may be sunk because the manhole cover is lifted over several tens to hundreds of kilometers with the asphalt surface as a fulcrum. There is. When the manhole cover is installed on the road where the tile block is paved, the surface of the tile block may be damaged, and in the worst case, the tile block may be damaged. In addition, if the road surface as a fulcrum is depressed or damaged, it is difficult to lift the manhole cover properly, and it is necessary to set the edge cutting device again, which may reduce the work efficiency of the edge cutting operation.

  In addition, the manhole cover has a disk shape, a square shape, and the like, and the outer dimensions thereof vary depending on the type and model of the manhole cover. Accordingly, there has been a demand for the development of an edge cutting device that can be used for a wide variety of manhole covers and that does not damage the road surface as described above and that is excellent in versatility and practicality.

  The object of the present invention is to enable the edge cutting operation to be carried out reliably without damaging the road surface even on the manhole cover having different shapes and outer dimensions, and therefore the manhole cover edge cutting device having excellent versatility and practicality. The purpose is to provide.

The present invention is directed to a manhole cover edge cutting device for lifting the manhole cover 4 from the receiving frame 40 and releasing the fitted state of the manhole cover 4 with respect to the receiving frame 40. This edge cutting device includes a frame 1 that extends in the horizontal direction of the left and right, a lift means that is provided at the center of the frame 1 in the left and right direction, and lifts the manhole cover 4, and is provided at both left and right ends of the frame 1 to load the entire device. Receiving support 10. Each support 10 is connected to the frame 1 by a connecting shaft 13 extending in the vertical direction, and each support 10 can be slid in the left-right direction with respect to the frame 1, and the connection shaft 13 is centered. Are connected to be rotatable. Then, according to the position and shape of the receiving frame 40, each support body 10 is slid and rotated, and the support body 10 is installed on the receiving frame 40, whereby the receiving frame 40 is used as a fulcrum by lift means. that is configured to be able to lift the manhole cover 4. A lift means is attached to the bearing hole 2 penetrating in the vertical direction at the center in the left-right direction of the frame 1, the bolt 3 inserted through the bearing hole 2, and the lower end of the bolt 3. An engaging portion 6 that can be engaged with the engaging hole 5 formed on the shaft 8, a shaft 8 having a female screw portion 7 that is screwed into the upper end of the bolt 3, and a handle 9 provided at the upper end portion of the shaft 8. Including configuration. The locking portion 6 includes two or more types of attachments 27 and 28 formed in accordance with the shape of the engagement hole 5 of the manhole cover 4 of different types. The upper end of the locking portion 6 is pivotably connected to the lower end of the bolt 3. The attachments 27 and 28 can be switched by swinging the locking portion 6 with respect to the bolt 3 .

  The support 10 is a flat plate arranged in a vertical posture, and the recess 10 is formed by cutting out one side of the bottom surface of the support 10 that contacts the receiving frame 40 in an arc shape.

  In the manhole cover edge cutting device according to the present invention, each support 10 is connected to the frame 1 so as to be slidable in the left-right direction and to be rotatable about the connecting shaft 13. Thus, if each support body 10 is comprised so that a slide operation and rotation operation are possible, as shown in FIG. 8, for example with respect to the disk-shaped manhole cover 4, both support bodies 10 and 10 are made into a C shape. As a result, both the supports 10 and 10 are not covered with the manhole cover 4, and the ring 10 is protruded from the receiving frame 40 and projected onto the road surface G while minimizing the protruding area of the supports 10 and 10. Both supports 10, 10 can be installed on the shaped receiving frame 40. In addition, as shown in FIG. 9, with respect to the square plate-shaped manhole cover 4, both supports 10, 10 are positioned in directions orthogonal to each other so as to be placed on two adjacent sides of the receiving frame 40. By displacing, both supports 10 and 10 can be installed on the receiving frame 40 having a square frame shape. However, for the manhole cover 4 having a small outer dimension, both supports 10 and 10 are displaced in parallel to each other, and both supports 10 are placed on two opposing sides of the rectangular frame-shaped receiving frame 40.・ 10 can be installed.

As described above, according to the edge cutting device according to the present invention, each support 10 is connected to the frame 1 so as to be slidable in the left-right direction and to be rotatable about the connecting shaft 13. The postures of the supports 10 and 10 can be received and appropriately displaced according to the shape and dimensions of the frame 40, so that both the supports 10 and 10 can be reliably installed on the frame 40.
Further, if both supports 10, 10 can be installed on the receiving frame 40 in this way, the manhole cover 4 can be lifted with the receiving frame 40 as a fulcrum, so that the road can be Problems such as damage or depression of the road surface G made of asphalt or tile blocks, which are inevitable in the form of lifting the manhole cover 4 with the surface G as a fulcrum, can be eliminated.
Therefore, according to the edge cutting device according to the present invention, it is possible to reliably perform edge cutting work on the manhole cover 4 having different shapes and outer dimensions without damaging the road surface G. An edge cutting device having excellent practicality can be obtained.

If one side of the bottom surface of the support 10 that contacts the receiving frame 40 is cut out in an arc shape to form the recessed portion 20, the receiving frame 40 is prevented from covering the support 10 with the manhole cover 4. It is possible to further minimize the protruding area of the support 10 that protrudes to the road surface G. That is, as shown in FIG. 8, when performing the edge cutting operation on the disk-shaped manhole cover 4 supported by the circular ring-shaped receiving frame 40, the recessed portion 20 side is directed toward the manhole cover 4 side. Then, the support bodies 10 and 10 can be placed as close as possible to the manhole cover 4 by the amount of the recessed portion 20 by displacing both the support bodies 10 and 10 in a C shape. Therefore, the protruding area of the support 10 that protrudes from the receiving frame 40 and reaches the road surface G can be minimized while preventing the support 10 from covering the manhole cover 4.
In addition, as shown in FIG. 9, when the edge cutting operation is performed on the quadrangular manhole cover 4 supported by the square frame-shaped receiving frame 40, the recessed portion 20 side is opposite to the road surface G on the contrary. By shifting the posture of the support 10 so as to be directed to the side, it is possible to minimize the protruding area of the support 10 that protrudes from the receiving frame 40 and reaches the road surface G by the amount of the recessed portion 20. .

  A lift means is attached to the bearing hole 2 penetrating in the vertical direction at the center in the left-right direction of the frame 1, the bolt 3 inserted through the bearing hole 2, and the lower end of the bolt 3. An engaging portion 6 that can be engaged with the engaging hole 5 formed in the shaft 8, a shaft 8 having a female screw portion 7 screwed into the upper end of the bolt 3, and a handle 9 provided at the upper end portion of the shaft 8. If included, the manhole cover 4 can be lifted and trimmed by a manual operation of rotating the handle 9. Therefore, the overall cost of the apparatus can be reduced as compared with a mode in which the lift means is configured by an electric mechanism such as a motor. Further, since the edge cutting device is constituted by the frame 1, the bolt 3, the shaft 8, and the handle 9, it is excellent in that the assembly work at the site is simple. It is also excellent in that the space occupied during transportation can be reduced by dividing each component.

  There are many types of opening shapes and opening dimensions of the engagement holes 5 of the manhole cover 4. Therefore, in the present invention, the locking portion 6 includes two or more types of attachments 27 and 28 formed in accordance with the shape of the engagement hole 5 of the manhole cover 4 of different types. Further, the upper ends of the locking portions 6 are pivotably connected to the lower ends of the bolts 3 so that the attachments 27 and 28 can be switched by swinging the locking portions 6 with respect to the bolts 3. did. According to this, it is possible to select the attachments 27 and 28 corresponding to the engagement holes 5 of the manhole cover 4 and to quickly proceed with the edge cutting operation by a one-touch operation of swinging the locking portion 6. Work efficiency can be greatly improved. Moreover, it is not necessary to prepare an edge cutting device for each type of the engagement hole 5 of the manhole cover 4, and an edge cutting device with excellent versatility can be realized.

It is a front view of the edge cutting device of a manhole cover concerning the present invention. It is a disassembled perspective view of an edge cutting device. It is a vertical front view of the principal part of an edge cutting device. It is a vertical side view of an edge cutting device. It is a vertical front view of the principal part of an edge cutting device. It is the sectional view on the AA line in FIG. (A) * (b) is a figure for demonstrating the switching method of an attachment. It is a figure for demonstrating the usage method of the edge cutting device with respect to a round manhole cover. It is a figure for demonstrating the usage method of the edge cutting device with respect to a square manhole cover.

EXAMPLE FIG. 1 to FIG. 9 show an example of a manhole cover edge cutting device (hereinafter simply referred to as an edge cutting device) according to the present invention. In the present invention, “front / rear”, “left / right”, and “upper / lower” refer to the cross arrows shown in FIG. 1 and 2, the edge cutting device includes a frame 1 extending in the left-right direction, a bolt 3 inserted through the bearing hole 2 in the central portion in the left-right direction of the frame 1, and a manhole cover 4 attached to the lower end of the bolt 3. A locking portion 6 that engages with the engaging hole 5, a shaft 8 having a female screw portion 7 that is screwed into the upper end of the bolt 3, a handle 9 provided at the upper end portion of the shaft 8, and the left and right sides of the frame 1. A pair of left and right supports 10 that are provided at both ends and receive the load of the entire apparatus. As shown in FIGS. 8 and 9, the manhole cover 4 is placed in a receiving frame 40 installed on the road surface G.

  The frame 1 includes a hollow cylindrical bearing body 11 having a bearing hole 2 and a pair of left and right wing bodies 12 and 12 that are welded and fixed to positions opposed to the outer peripheral surface of the bearing body 11. Each wing body 12 is a rectangular metal plate arranged in a vertical posture, and as shown in FIG. 1, the bottom surface is horizontal when viewed from the front, and the upper surface gradually slopes downward as it goes to the left and right. It is constricted and formed in a tapered shape.

  As shown in FIG. 5 and FIG. 6, a single support 10 is connected to the bottom surface of each wing body 12 via a connecting shaft 13 so as to be slidable in the left-right direction and also to be rotatable. Specifically, a relief groove 15 is formed in the bottom surface of each wing body 12 so as to be long in the left-right direction. A plate 17 having a long hole 16 in the left-right direction is surrounded by screws 18 so as to surround the escape groove 15. It is fixed. The flank 15 of the wing body 12 is provided to allow the screw head 13a, which is the connecting shaft 13, to slide in the left-right direction, and the long hole 16 of the plate 17 allows the shaft portion 13b of the connecting shaft 13 to be inserted. It is provided for forgiveness. Thus, the shaft portion 13b of the connecting shaft 13 is inserted into the long hole 16 of the plate 17 from above, and the plate 17 is fixed to the bottom surface of the wing body 12 so that the head portion is formed at the upper peripheral edge of the long hole 16 of the plate 17. By receiving the lower surface of 13a, the connecting shaft 13 can be supported so that it cannot be detached downward. Further, the connecting shaft 13 can be guided and supported by the escape groove 15 so as to be slidable in the left-right direction. Further, the connecting shaft 13 can be rotatably supported in the escape groove 15. Therefore, by mounting and fixing the support body 10 to the lower end of the connecting shaft 13, the support body 10 can be slidably operated with respect to the wing body 12, and can be configured to be rotatable.

  The support 10 is a trapezoidal metal plate having a short upper surface and a long bottom surface, and a concave portion 20 is formed by cutting out a central portion on one side of the bottom surface in an arc shape ( FIG. 8 and FIG. 9). That is, in the central part of the long side of the long side of the bottom surface, the penetration dimension in the thickness direction at the central part in the longitudinal direction is large, and the penetration dimension gradually decreases toward both ends in the longitudinal direction. An arcuate recess 20 is formed.

  Lifting means for lifting the manhole cover 4 is constituted by the bearing hole 2, the bolt 3, the locking portion 6, the shaft 8, and the handle 9 of the bearing body 11 of the frame 1. As shown in FIG. 3, the bolt 3 has a shaft portion 23 that is long in the vertical direction and has a male screw on the outer peripheral surface, and a connecting piece 24 that is connected to the lower end of the shaft portion 23. The connecting piece 24 is provided with a guide hole that allows insertion of a bolt 32 described later.

  As shown in FIGS. 2, 3, and 7, the locking portion 6 is a metal molded product in which a base frame block 26 and two attachments 27 and 28 are integrally formed. The base frame block 26 includes a pair of side wall portions 29 and 29, and an end wall portion 30 and a bottom wall portion 31 that connect the both side wall portions 29 and 29, and has openings on the upper side and one side. It is formed in a U-shaped cross section that captures the connecting piece 24 in a sandwiched manner by the portions 29 and 29. The first attachment 27 is formed to protrude from the outer surface of the end wall portion 30, and the second attachment 28 is formed to protrude from the outer surface of the bottom wall portion 31. Guide holes that allow insertion of the shaft portion of the bolt 32 are provided in the side wall portions 29 and 29. In a state where the connecting piece 24 is sandwiched between the side wall portions 29 and 29, the bolt 32 is inserted into both guide holes, and the nut 33 is fastened and fixed to the shaft portion of the bolt 32 protruding from the side wall portion 29. The engaging portion 6 is attached to the lower end. In such a mounted state, the locking portion 6 is swingable around the bolt 32. As shown in FIG. 7A, the first attachment 27 is directed downward, and the second attachment 28 is directed horizontally. The posture can be changed between the posture and the second posture in which the first attachment 27 is oriented in the horizontal direction and the second attachment 28 is directed downward. Further, the locking portion 6 can be rotated by rotating the bolt 3.

  As shown to Fig.7 (a), the 1st attachment 27 and the 2nd attachment 28 are formed in the different key shape corresponding to the engagement hole 5 of the manhole cover 4 applied. Specifically, the first attachment 27 has a polygonal shaft-shaped support shaft 27a extending in a cantilevered manner from the outer surface of the bottom wall portion, and a horizontally elongated substantially quadrangular prism shape formed at the free end of the support shaft 27a and extending in the horizontal direction. And a key block 27b. As shown in FIG. 7A, a guide surface 27c directed downward is formed at a corner portion between the bottom surface of the key block 27b and the side surface located on the length direction side. The manhole cover 4 to which the first attachment 27 is applied is formed with a rectangular oblong engagement hole 5 having a rounded corner. Accordingly, the key block 27b is inserted into the engagement hole after the insertion posture in which the extension direction of the key block 27b coincides with the extension direction of the engagement hole 5, and then the key block together with the bolt 3 is rotated by 90 °. By doing so, it can be set as the use posture which the upper surface of the key block 27b engages with the inner surface periphery of the engagement hole 5 (refer FIG. 1 and FIG. 3).

  As shown in FIGS. 7A and 7B, the second attachment 28 is formed so as to extend from the outer surface of the end wall 30 in a cantilevered manner to the columnar support shaft 28a and to the outer surface of the support shaft 28a. It consists of a pair of cross-section horseshoe-shaped wing blocks 28b and 28b. As shown in FIG. 7B, the manhole cover 4 to which the second attachment 28 is applied has a substantially cross-shaped engagement hole 5 with a rounded tip. The second attachment 28 has a substantially cross shape that matches the opening shape of the engagement hole 5 in a sectional view and is slightly smaller than the opening size of the engagement hole 5. Therefore, after inserting the second attachment into the engagement hole and rotating the second attachment with the bolt 3 by 90 °, the use posture in which the upper surface of the blade block 28b engages with the inner peripheral edge of the engagement hole 5 and can do.

  There are many types of manhole covers 4 with different opening shapes and opening dimensions of the engagement holes 5. Accordingly, when the upper end of the locking portion 6 is configured to be detachable from the lower end of the bolt 3 by the bolt 32-nut 33 structure, it has various shapes and opening dimensions by simply replacing the locking portion 6. Correspondence to the engagement hole 5 becomes possible. Further, when the attachments 27 and 28 of the locking part 6 are damaged, it is sufficient to replace only the locking part 6, which is much more advantageous in terms of cost compared to the case of replacing the entire edge cutting device. is there.

  The shaft 8 is a hollow cylindrical body having openings at the top and bottom, and a handle 9 is fixed to the upper end thereof. As shown in FIGS. 2 and 3, a female screw portion 7 that engages with the upper end of the bolt 3 is formed at the lower end of the shaft 8. By rotating the handle 9 clockwise, the locking portion The manhole cover 4 locked by 6 can be lifted. Specifically, the shaft 8 is always rotated at a fixed position in the vertical direction in which the lower end surface thereof is in contact with the upper end surface of the bearing body 11 of the frame 1, and the bolt 3 is relatively moved along with the rotation operation of the shaft 8. By pulling upward, the manhole cover 4 can be lifted to cut the edge from the receiving frame 40.

  The handle 9 includes hollow cylindrical handle shafts 35, 35 provided at two opposite positions on the outer surface of the shaft 8, and a non-slip grip body 36 externally fitted to the free ends of the handle shafts 35. The manhole cover 4 can be lifted by rotating the shaft 8 by gripping the grip body 36 with both hands and rotating it counterclockwise. When the weight of the manhole cover 4 is large, an operating rod such as a reinforcing bar is inserted into the tip opening of the handle shaft 35, and the operating rod is rotated to rotate the shaft 8 with a greater force. Thus, the manhole cover 4 can be lifted.

  Next, a method of using the edge cutting device configured as described above will be described with reference to FIGS. First, select the first position (see FIG. 7 (a)) or the second position (see FIG. 7 (b)) so that the attachments 27 and 28 that match the engagement hole 5 of the manhole cover 4 are located below. Then, the selected attachment 27 (28) is inserted into the engagement hole 5 from above. Next, the bolt is rotated by 90 ° to engage the attachment 27 (28) with the inner peripheral edge of the engagement hole 5. The postures of both supports 10 are displaced, and the supports 10 are installed on the receiving frame 40.

  When the support body 10 is installed, the protrusion area of the support body 40 that protrudes from the outer edge of the receiving frame 40 and reaches the road surface is minimized so that the support body 10 does not cover the manhole cover 4. Please note that. Specifically, as shown in FIGS. 8 and 1, when the edge cutting operation is performed on the disk-shaped manhole cover 4 supported by the circular ring-shaped receiving frame 40, the recessed portion 20 side is the manhole cover. Both supports 10 are slid and rotated so as to be directed to the side, and both supports 10 are formed in a letter C shape so that they are supported as close as possible to the manhole cover 4 by the notch 20. The body 10 can be installed on the receiving frame 40. Thus, the protruding area of the support 10 that protrudes from the receiving frame 40 and reaches the road surface G can be minimized while preventing the support 10 from covering the manhole cover 4.

  In addition, as shown in FIG. 9, when performing the edge cutting operation on the quadrangular manhole cover 4 supported by the square frame-shaped receiving frame 40, conversely, the concave portion 20 side is the road surface. The posture is oriented toward the G side. Thereby, the protrusion area of the support body 10 which protrudes from the receiving frame 40 by the amount of the recessed portion 20 and reaches the road surface G can be minimized.

  When the installation of the support 10 on the receiving frame 40 as described above is completed, the handle 9 is rotated clockwise. As a result, the bolt 3 can be pulled upward relative to the shaft 8, so that the manhole cover 4 locked to the locking portion 6 can be lifted upward and cut off from the receiving frame 40. . When a plurality of engagement holes 5 are provided in one manhole cover 4, the edge cutting operation as described above can be performed on each engagement hole 5.

  As described above, according to this edge cutting device, both the supports 10 and 10 can be reliably installed on the receiving frame 40, so that the manhole cover 4 can be lifted using the receiving frame 40 as a fulcrum. Therefore, it is possible to eliminate problems such as damage or depression of the road surface G made of asphalt or tile blocks, which is unavoidable in the form of lifting the manhole cover 4 with the road surface G as a fulcrum as in the conventional edge cutting device. it can. Further, it is possible to reliably perform the edge cutting operation on the manhole cover 4 having a different shape and outer dimensions without damaging the road surface G, and an edge cutting apparatus having excellent versatility and practicality is obtained. be able to.

  When the edge cutting operation as described above is completed, the manhole cover 4 can be moved to a predetermined position using, for example, an instrument as described in JP-A-9-60017.

  The attachments 27 and 28 of the locking portion 6 are not limited to the shapes shown in the above embodiment. The shape of the support 10 is not limited to the shape shown in the above embodiment.

DESCRIPTION OF SYMBOLS 1 Frame 2 Bearing hole 3 Bolt 4 Manhole cover 5 Manhole cover engagement hole 7 Female screw part 8 Shaft 9 Handle 10 Support body 13 Connecting shaft 20 Recessed part 27 Attachment (first attachment)
28 Attachment (second attachment)
40 Receiving frame

Claims (2)

A manhole cover edge cutting device for lifting the manhole cover (4) from the receiving frame (40) and releasing the fitting state of the manhole cover (4) to the receiving frame (40),
The frame (1) extending in the horizontal direction of the left and right, the lift means for lifting the manhole cover (4) provided at the center in the horizontal direction of the frame (1), and the entire apparatus provided at the left and right ends of the frame (1) A support (10) that receives a load of
Each support (10) and the frame (1) are connected by a connecting shaft (13) extending in the vertical direction,
Each support body (10) is connected to the frame (1) so as to be slidable in the left-right direction and to be rotatable about the connecting shaft (13).
Each support (10) is slid and rotated in accordance with the position and shape of the receiving frame (40), and the support (10) is placed on the receiving frame (40). 40) is configured so that the manhole cover (4) can be lifted by lifting means with a fulcrum as a fulcrum ,
The lift means includes a bearing hole (2) penetrating in the vertical direction at the center in the left-right direction of the frame (1), a bolt (3) inserted through the bearing hole (2), and a bolt (3 ) And a locking portion (6) that can be engaged with an engagement hole (5) formed in the manhole cover (4) and a female screw portion (7) that is screwed into the upper end of the bolt (3). ) And a handle (9) provided at the upper end of the shaft (8),
The locking portion (6) includes two or more types of attachments (27, 28) formed in accordance with the shape of the engagement hole (5) of the manhole cover (4) of different types,
The upper end of the locking portion (6) is pivotably connected to the lower end of the bolt (3), and the attachment (27) is operated by swinging the locking portion (6) with respect to the bolt (3). 28) A manhole cover edge cutting device characterized in that it can be switched . The support (10) is a flat plate arranged in a vertical posture,
2. The manhole cover edge cutting device according to claim 1, wherein one side of the bottom surface of the support body (10) in contact with the receiving frame (40) is cut out in an arc shape to form a recessed portion (20) .

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