JP5489337B2 - Drilling device and core cutter for drilling - Google Patents

Description

  The present invention relates to a drilling device and a core cutter for drilling, which cut and drill a manhole wall located at the outer peripheral edge of a sewer pipe connected to the manhole.

  In recent years, the sewerage facilities in the public have been damaged greatly due to the occurrence of earthquakes, which has had a great impact on life. Among them, since the connection part between the manhole and the sewer pipe (sewer pipe) is a rigid joint, the joint part between the manhole 10 and the sewer pipe 11 is cracked due to vibration caused by an earthquake, as shown in FIG. 11 'and damage to damage occur frequently. As a countermeasure against them, as shown in FIG. 16 (b), an earthquake-resistant structure 11 ″ having a flexible structure is added to the connecting portion of the manhole 10 and the sewer pipe 11 as shown in FIG. 16 (b). For example, from the inside of the manhole, the outer periphery of the sewer pipe at the connection between the existing manhole and the sewer pipe is drilled with a concrete core cutter, and elastic material is installed in the drilled hole However, a method for providing flexibility to the connection portion is provided.

  When a manhole wall is cut with a concrete core cutter, when the outer diameter of the sewer pipe is large, a concrete core cutter having a large diameter corresponding to the diameter of the sewer pipe cannot be carried in from the entrance of the manhole in many cases. Then, in such a case, the method (patent document 1) which divides | segments a concrete core cutter into some, carries in the divided | segmented concrete core cutter from the manhole entrance, assembles and drills inside a manhole is proposed. .

  Further, when drilling a manhole wall having a diameter larger than the inner diameter of the entrance of the manhole, it is also practiced to drill the wall by continuously drilling small holes on the circumference.

Japanese Patent No. 4046457

  However, in the method of continuously forming small holes, there is a problem that small circles are continuously formed on the circumference, so that it cannot be drilled into one flowing circle. Also, in the method of dividing the concrete core cutter into several parts and assembling and drilling inside the manhole, the concrete core cutter is divided into several parts and loaded into the manhole, and the parts divided inside the manhole are assembled, so that the work process There was a problem that work efficiency was poor in many narrow places.

  Therefore, the present invention has been made to solve such problems, and it is possible to cut and drill a manhole wall located at the outer peripheral edge of a sewer pipe connected to the manhole in a simple manner and reliably. It is an object of the present invention to provide a drilling device and a core cutter for drilling.

The present invention (Claim 1)
A drilling device for cutting and drilling a manhole wall located at the outer peripheral edge of a sewer pipe connected to a manhole,
A core cutter in which a plurality of cutter portions in which a plurality of chips are arranged in an arc shape are arranged in the arc direction;
Drive means for rotating each cutter portion of the core cutter along an arc;
A support device for supporting the core cutter and driving means so that the rotation axis of the core cutter coincides with the pipe axis of the sewer pipe,
Each of the cutter portions is supported so as to be movable in the radial direction so that each tip can be fixed when it reaches a position corresponding to the manhole wall on the outer peripheral edge of the sewer pipe to be drilled.

The present invention (Claim 7)
A core cutter for drilling for cutting and drilling a manhole wall located at the outer peripheral edge of a sewer pipe connected to the manhole,
A plurality of cutter parts in which a plurality of chips are arranged in an arc shape;
And supporting the plurality of cutter parts by shifting a predetermined angle in the arc direction, and supporting each cutter part to be movable in the radial direction,
The support part supports each cutter part so that it can be fixed when each tip of each cutter part reaches a position corresponding to the manhole wall on the outer peripheral edge of the sewer pipe to be perforated.

  In the present invention, when drilling work in the manhole, each cutter portion constituting the core cutter can be moved in the radial direction to reduce the diameter, so that the core cutter can be carried in from the entrance of the manhole without disassembling, Assembling of the perforating apparatus becomes easy. Moreover, since each cutter part is supported so that it can be fixed when each tip comes to a position corresponding to the manhole wall surface of the outer peripheral edge of the sewer pipe to be drilled, even when the diameter of the outer peripheral edge of the sewer pipe is large By adjusting the radial position of each cutter part, it becomes possible to reliably drill the manhole wall located at the outer peripheral edge of the sewer pipe.

It is a perspective view of the perforation apparatus installed in the manhole. It is a front view of a core cutter when a cutter part is moved inside in the diameter direction. It is a perspective view of a core cutter when a cutter part is moved inside in the diameter direction. It is a front view of a core cutter when a cutter part is moved to the maximum outside radially. It is a perspective view of a core cutter when a cutter part is moved to the maximum outside in the diameter direction. It is the perspective view of the core cutter which removed and showed a part cutter part when the cutter part was moved to the maximum in the radial direction outside. It is a perspective view which shows the back side of the cutter part of a core cutter. It is a perspective view of the support part which supports a cutter part so that a movement to radial direction is possible. It is sectional drawing along CC line of FIG. 4 which shows the movement of the radial direction of a cutter part. It is a perspective view which shows a part of rubber ring. (A) is a perspective view of a tightening stainless steel band, (b) is a perspective view of an extended stainless steel band. (A) Main part sectional drawing when an earthquake-resistant member is installed in the connection part of a manhole and a sewer pipe, (b) is the partially expanded view. FIG. 6 is a layout view when a punching device is installed in a manhole. It is a front view which shows a wall surface when a manhole wall is drilled. It is a partially broken perspective view which shows the state which exposed the outer periphery of the sewer pipe, after drilling the connection part of a manhole and a sewer pipe. (A) The schematic perspective view of the manhole before making it an earthquake resistant structure, (b) is the schematic perspective view of the manhole made into the earthquake resistant structure.

  The present invention performs cutting or drilling of a concrete structure using a core cutter having a plurality of chips arranged at the tip, and the present invention will be described in detail below based on the embodiments shown in the drawings. In the following description, a manhole wall will be described as an example of a concrete structure, but the present invention is not limited to a manhole wall, but can be applied to cutting and drilling of other concrete structures such as tunnels. It is.

  FIG. 1 shows a schematic configuration of a drilling device 1 provided with a cylindrical concrete core cutter (hereinafter simply referred to as a core cutter) 2. As will be described later, each part of the drilling device 1 is disassembled into a manhole 10. It is carried in and assembled.

  As shown in FIGS. 1 and 13, the manhole 10 includes a cylindrical concrete casing 10c and a concrete conical portion 10b integrated therewith, and the upper portion of the conical portion 10b is a circular opening. The entrance 10a of the manhole 10 is formed. A sewer pipe 11 made of a concrete pipe, a plastic pipe, a ceramic pipe or the like is connected to the lower portion of the manhole 10.

  Note that an invert for allowing the sewage to flow smoothly is installed at the bottom of the manhole 10, but in the present embodiment, the invert is not shown. When the invert is provided, a part of the invert is removed so that the manhole wall can be cut, and the cutting operation is performed.

  The perforating apparatus 1 includes a core cutter 2, a motor 3 as a driving unit that rotates the core cutter 2 around a cylindrical axis (core axis), a support device 4 that supports the core cutter 2, the motor 3, and the like. It can be disassembled into a core cutter 2, a motor 3 and a support device 4. The support device 4 also supports the lower frame 4a, the four columns 4b fixed to the lower frame 4a, the upper frame 4c fixed to the upper portion of the column 4b, the middle frame 4d, the core cutter 2, and the motor 3. The support frame includes a block 4e, a support beam 4f that supports the support block 4e so as to be movable back and forth, and an adjustment unit 4g that adjusts the vertical position of the middle frame 4d that supports the support beam 4f. Each component 4a-4g of the support apparatus 4 can be disassembled to such an extent that it can be carried into the manhole 10 from the entrance 10a of the manhole 10, respectively.

  The perforating apparatus 1 carries each component 4a-4g into the manhole 10 from the entrance 10a of the manhole 10, and is assembled in a manhole as follows.

  The lower frame 4a is installed on the bottom of the manhole 10, the core cutter 2 and the motor 3 are supported by the support block 4e, and the support block 4e is supported by the support beam 4f. Subsequently, four columns 4b are fixed to the lower frame 4a, and the upper frame 4c is fixed thereon. The middle frame 4d is attached to the upper frame 4c via the adjusting portion 4g, and the support beam 4f is attached to the upper frame 4c.

  The lower frame 4a, the column 4b, the upper frame 4c, and the middle frame 4d are assembled and fixed in the manhole 10 so that the support beam 4f passes through the circle center of the manhole 10 and faces the direction in which the sewer pipe 11 extends. The core cutter 2 is attached so that the rotation axis thereof coincides with the direction of the support beam 4f. Therefore, the rotation axis of the core cutter can be aligned with the pipe axis L of the sewer pipe 11 in the left-right direction. Further, by adjusting the vertical position of the support beam 4f by the adjusting unit 4g, the rotation axis of the core cutter 2 can be made to coincide with the pipe axis L of the sewer pipe 11 in the vertical direction. Therefore, the core cutter 2 and the motor 3 are supported by the support device 4 so that the rotation axis of the core cutter 2 coincides with the pipe axis L of the sewer pipe. The position of the core cutter 2 and the motor 3 in the front-rear direction can be adjusted by moving the support block 4e that supports the core cutter 2 and the motor 3 back and forth along the support beam 4f.

  The core cutter 2 is driven and rotated by a motor 3 as will be described later, and pressure is applied to the core cutter 2 in a direction in which the sewer pipe extends (pipe length direction) by means (not shown), which will be described later. The tip of the core cutter is configured to press against the wall surface of the manhole, cut the manhole wall according to the rotation of the core cutter, and drill it.

  The support device 4 can be carried into the manhole, and the motor 3 and the core cutter 2 are moved back and forth along the axis of the sewer pipe so as to coincide with the rotation axis of the core cutter 2 and the pipe axis of the sewer pipe. The supporting device is not limited to the above-described configuration as long as the supporting device can be supported so as to be movable in the direction.

  Here, the core cutter 2 will be described in more detail. In the following description, the radial direction refers to the radial direction of the circle of the sewer pipe, that is, the radial direction of the cylinder of the core cutter when the core cutter 2 is installed at a position where the manhole wall on the outer peripheral edge of the sewer pipe can be drilled. In addition, the axial direction refers to the direction in which the sewer pipe extends, that is, the cylindrical axial direction.

  The structure of the core cutter 2 is shown by FIGS. The core cutter 2 has a cylindrical shape with one open, and is made of four metal arc-shaped cutter portions 21 to 24 and a metal circular shape that supports the cutter portions 21 to 24 movably in the radial direction. It is comprised by the support part 40. 2 and 3 show the core cutter when the cutter parts 21 to 24 are moved in the radial direction to bring them closer to each other, and FIGS. 4 to 7 show the core cutter when they are moved farthest away.

  The cutter portion 21 has a bent portion 21a bent in an arc shape, and a fan-shaped flat bottom portion 21b that is integral with the bent portion 21a and orthogonal to the bent surface of the bent portion 21a, and both end portions 21f and 21g of the bottom portion 21b are It extends in a straight line and intersects at an angle of 90 degrees (FIG. 4), and intersects both side portions 21d and 21e of the bent portion 21a at a right angle. A plurality of chips 21c made of diamond chips or the like are arranged in an arc shape at equal intervals at the tip of the bent portion 21a. Further, as shown in FIG. 7, a rectangular guide plate 31 having steps on both side surfaces 31 a and 31 b to form an uneven surface is fixed to the bottom portion 21 b by screw connection using bolts 8 and screw holes 7. As will be described later, the guide plate 31 is formed with a screw hole 31d on the radial end surface 31c when the guide plate 31 is screwed with the guide plate and a stopper provided on the support portion.

  Each of the cutter parts 22 to 24 has the same shape and structure as the cutter part 21, and includes bent parts 22 a to 24 a, bottom parts 22 b to 24 b, both side end parts 22 d to 24 d, 22 e to 24 e, 22 f to 24 f, 22 g to 24 g, The chips 22c to 24c correspond to the bent portion 21a, the bottom portion 21b, the side end portions 21d, 21e, 21f, 21g and the tip 21c of the cutter portion 21, respectively. Also, the guide plates 32 to 34 fixed to the bottom portions 22b to 24b have the same shape and structure as the guide plate 31. The side surfaces 32a to 34a and 32b to 34b are stepped and uneven. The other end faces 32c to 34c are formed with 32d (in FIG. 7, screw holes in the other end faces 33c and 34c are not visible).

  As shown in FIG. 8, guide rails 41 to 48 are fixed to the support surface of the support portion 40 by screwing bolts (not shown) into the screw holes 9 from the back side, and guide rails 41, 42; 43, 44; 45, 46; 47 and 48 are L-shaped guide rails orthogonal to each other.

  The opposing side surfaces 41a to 48a of the guide rails 41 to 48 are concave and convex surfaces that are concavo-convexly fitted to the concave and convex surfaces of the corresponding guide plate. The side surfaces 41a and 44a of the guide rails 41 and 44 are on the same surface S1, the side surfaces 45a and 48a of the guide rails 45 and 48 are on the same surface S2, and the distance between the surfaces S1 and S2 is S. The side surfaces 42a and 47a of the guide rails 42 and 47 are on the same surface S3, the side surfaces 43a and 46a of the guide rails 43 and 46 are on the same surface S4, and the distance between the surfaces S3 and S4 is also S. Moreover, the length of the perpendicular drawn from the circle center 40a of the support portion 40 to each of the surfaces S1 to S4 is the same length d.

  Further, stoppers 51 to 54 which are in surface contact with the end surfaces 31c to 34c provided with screw holes of the guide plates 31 to 34 are respectively positioned at distances d1 from the circular center 40a of the support portion 40 by bolts (not shown) from the back side. It is fixed by screwing into the screw hole 6.

  Both side surfaces 31a and 31b of the guide plate 31 are concavo-convexly engaged with the opposing side surfaces 41a and 48a of the guide rails 41 and 48, respectively, to guide the cutter unit 21 from moving in the radial direction from the circular center 40a of the support unit 40. . Movement of the guide portion 21 toward the outer peripheral side along the radial direction is prevented by the guide plate 31 coming into contact with the stopper 51. When the guide plate 31 comes into contact with the stopper 51, the bolt 51a inserted through the stopper 51 is screwed into the screw hole 31d of the guide plate 31 so that the cutter portion 21 can be fixed at this contact position (FIG. 9). (B)).

  Similarly, both side surfaces 32a and 32b of the guide plate 32 are concavo-convexly fitted with the opposite side surfaces 43a and 42a of the guide rails 43 and 42, respectively, and both side surfaces 33a and 33b of the guide plate 33 are opposed to the guide rails 45 and 44. The side surfaces 45a and 44a are respectively concavo-convexly fitted, and both side surfaces 34a and 34b of the guide plate 34 are concavo-convexly engaged with the opposite side surfaces 47a and 47a of the guide rails 47 and 46, respectively, and the cutter portions 22 to 24 are respectively support portions. It is guided to move in the radial direction from the 40 circular center 40a. When the guide plates 32 to 34 abut against the corresponding stoppers 52 to 54, the bolts 52a to 54a inserted through the stoppers 52 to 54 are screwed into the screw holes of the guide plates 32 to 34, so that the cutter portions 22 to 24 are moved. It can fix to this contact position.

  The cutter parts 21 to 24 in which a plurality of chips are arranged in an arc shape are arranged at an angular interval of 90 degrees in the arc direction to constitute a cylindrical core cutter 2.

  In addition, when each cutter part 21-24 is fixed to the support part 40 in the contact position, the curvature center of the circular arc of the bending parts 21a-24a of each cutter part 21-24 exists in the circle center 40a of the support part 40, respectively. The arrangement of the chips 21c to 24c of each cutter part 21 to 24 is circular as shown in FIG. 4, and the diameter B corresponds to the diameter of the outer peripheral edge of the sewer pipe 11 to be cut. .

  The core cutter 2 is attached to the motor 3 such that the support portion 40 rotates about the circle center 40a. Thereby, each cutter part 21-24 of the core cutter 2 passes along the circular center 40a of the support part 40, and rotates along a circular arc centering on the axis | shaft (cylindrical axis of a core cutter) orthogonal to the surface of the support part 40. be able to.

  With such a configuration, when the core cutter 2 is carried in from the entrance 10a of the manhole 10, the cutter units 21 to 24 are pushed inward in the radial direction by hand. As shown in FIG. 2 and FIG. 3, each cutter portion 21 to 24 moves in the radial direction to a position where the curved portion of each cutter portion and both end portions of the bottom portion are in contact with each other, and the diameter of the core cutter 2 is reduced. Therefore, the core cutter 2 can be easily carried into the manhole 10 (shown by A in FIGS. 2 and 4).

  After carrying in the core cutter 2 in the manhole 10, each cutter part 21-24 is moved to the radial direction outward until the guide plates 31-34 contact | abut the corresponding stoppers 51-54. When the guide plates 31 to 34 abut against the stoppers 51 to 54, the cutter units 21 to 24 are fixed to the support unit 40. At this time, the core cutter 2 is in the state shown in FIG. The radial movement of the guide portion 21 and its fixing to the support portion 40 are shown in FIGS. 9 (a) and 9 (b).

  As described above, the core cutter 2 and the motor 3 are attached to the support device 4. The rotation axis of the core cutter 2 (the axis passing through the circular center 40a of the support portion 40 and orthogonal to the surface of the support portion 40) is made to coincide with the pipe axis L of the sewer pipe.

  Since the chips 21c to 24c of the core cutter 2 are arranged at positions corresponding to the manhole walls on the outer peripheral edge of the sewer pipe (FIGS. 4 and 5), the chips of the core cutter 2 are placed on the manhole walls. When the cutter parts 21 to 24 are rotated against each other, the chips 21 c to 24 c cut the manhole wall along the outer peripheral edge of the sewer pipe 11. Since the core cutter 2 is urged in the direction in which the sewer pipe 11 extends, the chips 21c to 24c can cut the manhole wall until they penetrate the manhole wall.

  FIG. 14A shows a portion 10d that has been cut and penetrated by the core cutter 2. The penetrating portion 10d corresponds to a locus when the chips 21c to 24c of the core cutter 2 are rotated. Since the manhole wall 10e is still fixed to the outer periphery of the sewer pipe 11, if this portion is crushed and removed with a hammer or the like, a ring-like shape is formed on the outer periphery of the sewer pipe 11 as shown in FIG. A hole 10f is formed.

  In FIGS. 14A and 14B, the penetrating portion 10d, the sewer pipe 11 and the like are drawn as circles. However, since the manhole wall surface is actually curved, it becomes an irregular circle.

  In this way, a rubber ring as an earthquake-resistant member is fitted into the ring-shaped wall hole 10f formed at the connection portion between the manhole 10 and the sewer pipe 11, and the connection portion is made into an earthquake-resistant structure.

  FIG. 10 shows a rubber ring 12 cut into about half to show a cross section. The rubber ring 12 is a ring-shaped member having a horizontal U-shaped cross section formed of styrene-butadiene rubber (SBR) as a material, and grooves 12a are formed on the outer peripheral inner surface and the inner peripheral inner surface of the rubber ring 12 over the entire circumference. , 12b are formed. The expanded stainless steel band 13 shown in FIG. 11 (b) is fitted in the groove 12a on the outer peripheral side of the rubber ring 12, and the tightening stainless steel band 14 shown in FIG. 11 (a) is fitted in the groove 12b on the inner peripheral side. It is.

  As shown in FIG. 11 (a), the tightening stainless steel band 14 can be adjusted in band diameter by an adjusting tool 14a. Further, as shown in FIG. The partial band 13a is connected by the adjusting tool 13b, and the band diameter can be adjusted by the adjusting tool 13b.

  Preferably, a guide band (not shown) is fitted in each groove 12a, 12b and silicone oil is applied so that the extended stainless steel band 13 and the tightening stainless steel band 14 slide smoothly in the grooves 12a, 12b and expand uniformly. Keep it.

  As shown in FIG. 15, the epoxy sealant 15 is applied to the inner periphery of the wall hole 10 f of the manhole 10 and the outer periphery of the sewer pipe 11 with a thickness of about 1 to 2 mm over the entire area.

  Next, as shown in FIG. 12, the rubber ring 12 into which the extended stainless steel band 13 and the tightening stainless steel band 14 are fitted is fitted into the wall hole 10f so that the U-shaped open portion faces the manhole. Then, the diameter of the extended stainless steel band 13 is increased, the diameter of the tightened stainless steel band 14 is reduced, and the rubber band 12 is pressed against the inner periphery of the wall hole 10f of the manhole and the outer periphery of the sewer pipe 11. At this time, the epoxy sealing material 15 oozes out, the rubber ring 12 is securely fixed to the wall hole 10f, and the portion is sealed.

  Subsequently, the mortar 16 is poured into the recess 12c of the rubber ring 12, and the surfaces of the manhole 10 and the rubber ring 12 are finished with mortar.

  In this way, since the connecting portion between the manhole 10 and the sewer pipe 11 has a flexible structure due to the earthquake-resistant member (rubber ring), even if an earthquake occurs, the portion is less likely to crack or break. It is possible to prevent earth and sand or groundwater from flowing into the place where the manhole 10 and the sewer pipe 11 are connected.

  In the embodiment described above, the number of cutter units is four, but the number of cutter units may be three, five, or more. In any case, a plurality of chips are arranged in each arc shape in each cutter portion, and each cutter portion is arranged with a predetermined angle shifted so as not to overlap each other in the arc direction to form a core cutter. Moreover, each cutter part is supported so that a movement to radial direction is possible, and when each chip | tip of each cutter part comes to the position corresponded to the manhole wall surface of the outer periphery of the sewer pipe which should be pierced, it is fixed.

  Moreover, although the core cutter has a cylindrical shape as a whole, it can be a conical core cutter by reducing the diameter of the portion of each cutter portion opposite to the tip.

DESCRIPTION OF SYMBOLS 1 Punching device 2 Core cutter 3 Motor 4 Support device 10 Manhole 11 Sewer pipe 12 Rubber ring 13 Extended stainless steel band 14 Tightened stainless steel band 15 Epoxy sealant 16 Mortar 21-24 Cutter part 21c-24c Tip 31-34 Guide plate 40 Support part 41-48 Guide rail 51-54 Stopper

Claims (12)

A drilling device for cutting and drilling a manhole wall located at the outer peripheral edge of a sewer pipe connected to a manhole,
A core cutter in which a plurality of cutter portions in which a plurality of chips are arranged in an arc shape are arranged in the arc direction;
Drive means for rotating each cutter portion of the core cutter along an arc;
A support device for supporting the core cutter and driving means so that the rotation axis of the core cutter coincides with the pipe axis of the sewer pipe,
Each said cutter part is supported so that movement is possible in a diameter direction so that it can fix, when it becomes a position corresponding to the manhole wall of the outer periphery of a sewer pipe which each chip should drill. apparatus.   The said core cutter is provided with the stopper which prevents that each cutter part moves to an outer peripheral side to radial direction, Each cutter part is fixed when it contact | abuts to a stopper. The drilling device described.   The perforating apparatus according to claim 1 or 2, wherein when the cutter units are fixed, the chip arrangement is circular.   The punching device according to any one of claims 1 to 3, wherein the core cutter is provided with a guide portion for moving each cutter portion in a radial direction.   The punching device according to any one of claims 1 to 4, wherein the cutter unit is moved inward in a radial direction so that the cutter unit can be carried in from a manhole entrance.   The perforating apparatus according to any one of claims 1 to 5, wherein four cutter parts are provided, and an arc of each cutter part is a quarter arc. A core cutter for drilling for cutting and drilling a manhole wall located at the outer peripheral edge of a sewer pipe connected to the manhole,
A plurality of cutter parts in which a plurality of chips are arranged in an arc shape;
And supporting the plurality of cutter parts by shifting a predetermined angle in the arc direction, and supporting each cutter part to be movable in the radial direction,
The support portion supports each cutter portion so that each tip of each cutter portion can be fixed when the tip reaches a position corresponding to the manhole wall on the outer peripheral edge of the sewer pipe to be punched. Core cutter.   8. The stopper according to claim 7, wherein the support portion is provided with a stopper that prevents the cutter portion from moving radially outward, and each cutter portion is fixed to the support portion when contacting the stopper. The core cutter for drilling as described.   9. The core cutter for drilling according to claim 7, wherein each chip arrangement is circular when the cutter parts are fixed.   The said support part has a guide part for moving each cutter part to radial direction, The core cutter for perforation of any one of Claim 7 to 9 characterized by the above-mentioned.   The core cutter for drilling according to any one of claims 7 to 10, wherein the cutter part is moved inward in the radial direction so that the cutter part can be carried in from a manhole entrance. The core cutter for drilling according to any one of claims 7 to 11, wherein four cutter parts are provided, and an arc of each cutter part is a quarter arc.

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