JP5396443B2 - Roller cutter and cutter head for crushing reinforced concrete pipes - Google Patents

Description

  The present invention relates to a roller cutter for crushing a reinforced concrete pipe for crushing an end surface of the reinforced concrete pipe when renewing a reinforced concrete pipe such as a fume pipe buried in the ground, and a reinforced concrete pipe crushing device provided with this roller cutter. In detail, a roller cutter for crushing a reinforced concrete pipe formed in a frustoconical or cylindrical shape and provided with a large number of blades on the outer peripheral surface of a main body rotating in the circumferential direction, and the roller cutter is reinforced concrete. The present invention relates to a cutter head for crushing a reinforced concrete pipe that is revolved while being pressed against an end face of the pipe.

  Hume pipes are used as sewer pipes and irrigation water buried underground. The fume pipe is a cylindrical reinforced concrete pipe in which an annular horizontal reinforcing bar and a straight vertical reinforcing bar are knitted or embedded in a cylindrical concrete part. A large number of annular horizontal reinforcing bars are arranged at equal intervals in the length direction in the concrete portion. A large number of straight vertical reinforcing bars are arranged at equal intervals in the circumferential direction in the concrete portion.

  When such an existing fume pipe (hereinafter also referred to as “existing pipe”) deteriorates, it is replaced with a new fume pipe. At the time of this update, a cutter head for crushing reinforced concrete pipes that crush the end faces of existing pipes is used.

  For example, Patent Document 1 discloses an invention relating to a cutter head capable of efficiently and reliably cutting a vertical reinforcing bar embedded in a cylindrical concrete portion, and an invention relating to this cutter head using a spiral roller cutter. Have been described. As shown in FIG. 10A, the cutter head 100 is provided with a disk roller cutter 110, a spiral roller cutter 120, and two normal disk cutters 130 that can rotate (rotate).

  The disk-shaped roller cutter 110 has a rotation axis 110a in the diameter direction of the cutter head 100, and the blade edge 111 of the disk-shaped blade portion is slightly forward of the blade edge 121 of the helical roller cutter 120 (in FIG. 10A). (Surface side of the paper surface) Then, as shown in FIG. 10B, the cutter head 100 rotates while being pressed against the end surface 201 of the existing pipe 200, so that the blade portion of the disk-shaped roller cutter 110 becomes a concrete portion of the end surface 201 of the existing pipe 200. 210 is crushed concentrically (indicated by a trajectory X), and the vertical reinforcing bar 220 is exposed. The exposed vertical reinforcing bar 220 is bent in the rotation direction by the rotating cutter head 100.

  The spiral roller cutter 120 has a rotation axis 120a in the diameter direction of the cutter head 100, and a plurality of spiral blade portions 122 are formed with a pitch angle of 20 degrees to 80 degrees. As shown in FIG. 10B, when the cutter head 100 rotates while being pressed against the end surface 201 of the existing pipe 200, the spiral blade 122 is formed in an arc shape on the end surface 201 of the existing pipe 200 from the outer periphery to the inner peripheral direction. It moves while rotating (indicated by the locus Y).

  Therefore, the helical blade 122 of the helical roller cutter 120 cuts the bent vertical reinforcing bar 220 to a length of ΔL. In addition, since the crushing surface of the disk-shaped roller cutter 110 is arranged in front of the cutting surface of the helical roller cutter 120, the burden of crushing the concrete portion 210 by the helical roller cutter 120 is reduced.

  Patent Document 1 also describes a cutter head 100 in which two spiral roller cutters 120 are mounted without mounting the disc-shaped roller cutter 110.

Japanese Patent Laid-Open No. 10-37680

  The cutter head 100 described in Patent Document 1 is such that the disk-shaped roller cutter 110 revolves while rotating, thereby crushing the concrete portion 210, bending the exposed vertical rebar 220, and the helical roller cutter. The vertical reinforcing bar 220 is cut by revolving while 120 rotates.

  Therefore, the helical roller cutter 120 can cut the vertical reinforcing bar 220 by revolving while rotating in a direction intersecting with the vertical reinforcing bar 220. However, the vertical reinforcing bar 220 may be bent in the direction of the locus Y depending on the pulverized state of the concrete portion 210 or the exposed state of the vertical reinforcing bar 220, and in this case, the vertical reinforcing bar 220 may not be cut by the spiral roller cutter 120.

  Accordingly, the present invention provides, for example, a roller cutter capable of not only efficiently crushing an end surface of a concrete portion of an existing pipe but also cutting a reinforcing bar when the existing pipe is updated, and the roller cutter. It is an object to provide a cutter head for crushing a reinforced concrete pipe provided with

  The roller cutter for crushing a reinforced concrete pipe according to the present invention is a roller cutter that revolves while rotating while being pressed against an end face of a reinforced concrete pipe in which an annular horizontal reinforcing bar and a straight vertical reinforcing bar are embedded in a cylindrical concrete part. A large number of blade portions in the direction along the central axis project radially from the outer peripheral surface of the frustoconical or columnar body portion with the rotation axis as the central axis, and the blade portions extend in the circumferential direction. It is characterized by a curved arcuate shape or a meandering shape.

  According to this roller cutter for crushing reinforced concrete pipes, the blade part curves in a bow shape or wobbles in a wavy shape, so that the blade part has “\” and “/” in front view with the curved part as a boundary. It is formed in two directions. Therefore, when this roller cutter is pressed against the end surface of the cylindrical concrete portion and revolves while rotating, a force in two directions acts on the radial direction of the end surface of the concrete portion to crush the concrete portion, It can be cut by pushing the reinforcing bars bent in either direction.

  In the present invention, the curve or meandering of the blade portion may be formed symmetrically with the center in the length direction of the main body portion as the axis of symmetry, or may be formed asymmetrically. This includes not only the arc shape but also a bent state.

  Further, in the roller cutter for reinforced concrete pipe crushing according to the present invention, the blade portion has a pair of inclined surfaces inclined from the top in a Λ-shaped side surface, and each of the inclined surfaces and the outer peripheral surface of the main body portion. It is preferable that the top portion is formed to curve or meander between two parallel virtual lines that linearly connect the end points of the boundary line.

  According to this roller cutter for crushing reinforced concrete pipes, the blade portion is tapered by having a pair of inclined surfaces inclined in a Λ shape from the top. Each slope is curved or meandering and continues to the outer peripheral surface of the main body. And assuming two parallel imaginary lines that linearly connect each end point of each boundary line between each slope and the outer peripheral surface of the main body, the top of the blade portion is between these two imaginary lines. By being formed to curve or meander, the blade portion curves or meanders with a small amplitude instead of a large amplitude.

  Therefore, this roller cutter can prevent an increase in cost for processing the blade portion. And the top part of the blade part with a large amplitude has a wide curved part, making it difficult to crush the concrete part or to cut the reinforcing bar. By narrowing it almost constant over the entire length, the concrete part can be accurately crushed and the rebar can be cut.

  In the roller cutter for crushing reinforced concrete pipes according to the present invention, the blade portion is preferably formed at a ratio of a wavelength of 38 to 40 with respect to an amplitude of 1.

  According to the roller cutter for crushing reinforced concrete pipes, the blade portion curves or meanders with a very large radius of curvature.

  A cutter head for crushing a reinforced concrete pipe according to the present invention includes any one of the roller cutters according to the present invention, a base rotating in a circumferential direction, and the roller cutter as a base with a rotation axis directed in a radial direction. It is characterized by having a bracket that can be freely rotated.

  According to this cutter head for crushing reinforced concrete pipe, the roller cutter is fixed to the base by the bracket with the rotation axis in the radial direction, and the base rotates by pressing the roller cutter against the end surface of the concrete part. The cutter crushes the concrete part and cuts the rebar. That is, the roller cutter receives a reaction force from the end surface of the concrete portion when pressed against the end surface of the concrete portion and rotates the base, and revolves while rotating by the reaction force. Then, as described above, the roller cutter crushes the concrete portion and cuts the concrete portion so that the other force is pushed by a pair of adjacent blade portions.

  In the cutter head for crushing reinforced concrete pipes according to the present invention, it is preferable that roller cutters having different blade shapes are fixed to the base.

  According to this cutter head for crushing reinforced concrete pipe, a plurality of roller cutters are fixed to the base, and the shape of the blade part is changed, so that the concrete part is crushed without being biased to a specific part, and in different directions. The folded rebar can be cut.

  In the cutter head for crushing reinforced concrete pipes according to the present invention, it is preferable that any one of the roller cutters according to the present invention is also provided in a central portion of the base.

  According to this cutter head for crushing reinforced concrete pipes, when filling concrete into a concrete part and crushing reinforced concrete pipes, the filled concrete can be crushed by the roller cutter according to the present invention. In addition, by filling the concrete part with concrete, the crushed concrete part and the cut reinforcing bar are not pushed into the back side of the concrete part (the traveling direction of the cutter head for crushing reinforced concrete pipes), and the rear of the cutter head Can be discharged.

  According to the present invention, by providing a roller cutter having an arcuately curved or wavy serpentine blade portion, and providing a cutter head for crushing a reinforced concrete pipe provided with this roller cutter. In addition to crushing the concrete part of the reinforced concrete pipe, the existing pipe can be renewed by reliably cutting the rebar.

1 shows an embodiment of a cutter head for crushing reinforced concrete according to the present invention, where (a) is a front view, (b) is a sectional view taken along line BB of (a), and (c) is CC of (a). It is line sectional drawing. It is a schematic perspective view which shows one Embodiment of the (1st) roller cutter which concerns on this invention. 1 shows an embodiment of a (first) roller cutter according to the present invention, wherein (a) is a right side view, (b) is a front view, and (c) is a left side view. It is a schematic perspective view which shows one Embodiment of the (2nd) roller cutter which concerns on this invention. One Embodiment of the (2nd) roller cutter which concerns on this invention is shown, (a) is a right view, (b) is a front view, (c) is a left view. (A) (b) is a front view which shows the blade part of different embodiment of the roller cutter which concerns on this invention, (c) is a front view which shows the shape of an inappropriate blade part. It is a rear view which shows one Embodiment of the base | substrate with which the cutter head for reinforced concrete crushing which concerns on this invention was equipped. It is a front view which shows the bracket for fixing the (1st) roller cutter with which the cutter head for reinforced concrete crushing concerning this invention was equipped. It is a front view which shows the bracket for fixing the (2nd) roller cutter with which the cutter head for reinforced concrete crushing concerning this invention was equipped. (A) is a front view which shows the conventional cutter head, (b) is the schematic which shows the state which grind | pulverizes a concrete pipe with this cutter head.

  FIG. 1 to FIG. 9 show an embodiment of a roller cutter (hereinafter referred to as “roller cutter”) and a cutter head (hereinafter referred to as “cutter head”) for crushing reinforced concrete pipes according to the present invention. The description will be given with reference. As described in the background art, the roller cutter and the cutter head are, for example, an end face of a reinforced concrete pipe when renewing a reinforced concrete pipe 200 (see FIG. 10, hereinafter not denoted by reference numeral) such as a fume pipe. Used for crushing.

  As shown in FIG. 1, the cutter head in this embodiment has a configuration in which a total of four types of roller cutters 10, 20 are fixed to a base 50 by brackets 30, 40 so as to rotate freely. The base 50 is attached to the top of a shield propulsion machine (not shown).

  The shield propulsion device has a cylindrical casing disposed on the central axis of a cylindrical shield body, the base 50 is fixed to the tip of the cylindrical casing, an auger screw and a water supply hose are disposed in the cylindrical casing, and The cylindrical casing and the auger screw are configured to rotate in opposite directions by the drive source.

  Two roller cutters (hereinafter referred to as “first roller cutters”) 10 are fixed to the vicinity of the peripheral edge of the substrate 50 by brackets 30 at intervals of 180 °. However, the end of each first roller cutter 10 protrudes slightly from the outer peripheral edge of the base 50.

  As shown in FIGS. 2 and 3, the first roller cutter 10 has a blade portion 13 along the central axis 10c on the outer peripheral surface of a truncated cone-shaped main body portion 12 in which a shaft hole 11 (see FIG. 8) is formed. Are projectingly provided in a radial direction, and the blade portion 13 is meandering in a wavy shape curved in the circumferential direction (vertical direction in FIG. 3A). Further, the blade portion 13 is chamfered at the end portion on the enlarged diameter portion side, and the end portion is prevented from protruding as shown in FIG.

  Two roller cutters (hereinafter referred to as “second roller cutter”) 20 are fixed by a bracket 40 in a direction intersecting with a diameter connecting the two first roller cutters 10. One second roller cutter 20 is fixed to substantially the center of the base 50, and the other second roller cutter 20 is fixed between the center of the base 50 and the outer peripheral edge.

  As shown in FIGS. 4 and 5, the second roller cutter 20 has a blade portion parallel to the central axis 20c on the outer peripheral surface of the cylindrical body portion 22 in which the shaft hole 21 (see FIG. 9) is formed. A large number of projections 23 are provided in the radial direction, and the blade portions 23 meander in a wavy manner in the circumferential direction (vertical direction in FIG. 3A).

  The blade portions 13 and 23 of the first and second roller cutters 10 and 20 are both “\” in front view with the downwardly convex curved portions 13a and 23a and the upward convex curved portions 13a and 23a as a boundary. ”And“ / ”. The curved portions 13a and 23a are preferably formed in an arc shape, but may be bent in a square shape so as to be easily crushed.

  The blade portions 13 and 23 have a pair of inclined surfaces 13c and 23c that are formed in a substantially Λ-shaped side surface and are inclined from the narrow top portions 13b and 23b. Further, as shown in FIGS. 6 (a) and 6 (b), the blade portions 13 and 23 linearly connect the end points of the boundary lines between the inclined surfaces 13c and 23c and the outer peripheral surfaces of the main body portions 12 and 22, respectively. The apex portions 13b and 23b meander between the parallel virtual lines L and L of the book so as to meander with respect to the central axes 10c and 20c.

  The blade portions 13 and 23 in FIGS. 6A and 6B are formed at a ratio of the wavelength 38 to 40 with respect to the amplitude 1. The blade 3 shown in FIG. 6C for comparison is meandering so that the top 3b comes out of the parallel imaginary lines L and L, in other words, meandering with a very small radius of curvature. Since this blade part 3 is not only difficult to crush the concrete part and the reinforcing bar due to the thick top part 3b of the curved part 3a, but also difficult to manufacture, the blade part 3 contributes to an increase in cost. I can say that.

  On the other hand, in the blade portions 13 and 23 shown in FIGS. 6A and 6B, the top portions 13b and 23b are narrowly formed over the entire length, and the concrete portion and the reinforcing bar are easily crushed. The blade portions 13 and 23 in FIG. 6A are of a type in which both end portions are offset from the center line C of the blade portion, and the blade portions 13 and 23 in FIG. Is the same type as the center line C.

  A shaft 14 as shown in FIG. 8 passes through the shaft hole 11 of the first roller cutter 10, and both end portions of the shaft 14 are held by the bracket 30. The shaft 14 includes an intermediate portion 14a that is fitted into the shaft hole 11 of the first roller cutter 10, an angular shaft portion 14b that protrudes from the center of one end (center side of the base 50) of the intermediate portion 14a, and an intermediate portion 14a. The other end (periphery side of the base 50) surface and the angular shaft portion 14c protruding from a position eccentric to the base 50 side are integrally formed.

  And since the main-body part 12 is frustoconical shape, the 1st roller cutter 10 is made into the attitude | position inclined with respect to the base | substrate 50, and the blade part 13 contacts the end surface of a reinforced concrete pipe over the full length, A bracket 30 holds the respective angular shaft portions 14 b and 14 c of the shaft 14. Therefore, the bracket 30 is composed of two bearing portions 31, and the tip end side of each bearing portion 31 is inclined so as to incline the center line of the first roller cutter 10. The front end side portion of the bracket 30 is fixed by a fixture 32 that holds the respective angular shaft portions 14b and 14c of the shaft 14. Note that the fixture 32 is fixed to the bearing portion 31 by a bolt 33.

  Further, a shaft 24 as shown in FIG. 9 passes through the shaft hole 21 of the second roller cutter 20, and both end portions of the shaft 24 are held by the bracket 40. The shaft 24 has a configuration in which an intermediate portion 24a fitted into the shaft hole 21 of the second roller cutter 20 and square shaft portions 24b and 24c protruding from the center of each end surface of the intermediate portion 24a are integrally formed. .

  And since the main-body part 22 is cylindrical shape, the 2nd roller cutter 20 is made into the attitude | position parallel to the base | substrate 50, and the bracket 40 so that the blade part 13 may contact the end surface of a reinforced concrete pipe over the full length. Holds the respective angular shaft portions 24b, 24c of the shaft 24. That is, the bracket 40 is composed of two bearing portions 41, each of the angular shaft portions 24 b and 24 c projecting perpendicularly to the base 50, and a fixing tool 42 that holds the end portion of the shaft 24 at the distal end side portion. Fixed by. Note that the fixing tool 42 is fixed to the bearing portion 41 by a bolt 43.

  Roller bearings 15, 25 are arranged in parallel between the intermediate portions 14 a, 24 a of any of the shafts 14, 24 and the shaft holes 11, 21 of the first and second roller cutters 10, 20. , 25 are provided with ball bearings 16, 26, and O-rings 17, 27 are fitted outside the roller bearings 15, 25. Further, small holes 14d and 24d into which the balls of the ball bearings 16 and 26 are inserted are formed in the intermediate portions 14a and 24a of the shafts 14 and 24. The small holes 14d and 24d are closed by the ball pins 18 and 28. ing.

  As shown in FIG. 7, the base 50 is provided with window holes 50a corresponding to the positions of the first and second roller cutters 10 and 20, and the crushed concrete portion of the reinforced concrete pipe, filled concrete or The cut reinforcing bars (hereinafter collectively referred to as “slip”) are discharged backward from the window hole 50a. Further, although not shown in the drawings, the base 50 is provided with a pipe for removing the slip adhering to the first and second roller cutters 10 and 20.

  As shown in FIG. 1, the outer periphery of the base 50 is surrounded by a cylindrical outer cover 51, and the front end side of the outer cover 51 is closed by the head cover 52. Naturally, the head cover 52 is provided with a window hole 52a through which the first and second roller cutters 10 and 20 protrude.

  Here, a method of crushing an existing cylindrical reinforced concrete pipe (existing pipe) from an end face using a roller cutter and a cutter head will be described.

  Prior to crushing the existing pipe, the hollow portion of the existing pipe is filled with concrete. With this filled concrete (hereinafter referred to as “filled concrete”), it is possible to prevent the slippage from being pushed into the back side of the existing pipe (the front side where the cutter head advances).

  The first roller cutter 10 is pressed against the annular end surface of the concrete portion of the existing pipe, the second roller cutter 20 on the center side is pressed against the filled concrete, and the second roller cutter 20 at an eccentric position is placed on the existing pipe. Press across the inside of the annular end face and the filled concrete. When the base 50 rotates in one direction, the first and second roller cutters 10 and 20 revolve while rotating.

  Then, the blade portion 13 of the first roller cutter 10 mainly crushes the end face of the existing pipe, and the blade portion 23 of the second roller cutter 20 crushes the filled concrete. Further, the eccentric blade portion 23 of the second roller cutter 20 crushes the inner side of the end face of the existing pipe and the outer peripheral portion of the filled concrete.

  The top portion 13b of the blade portion 13 of the first roller cutter 10 rotates and revolves while biting into the end face of the existing pipe, whereby the concrete is crushed and the horizontal reinforcing bar is cut. That is, the horizontal reinforcing bar and the vertical reinforcing bar are cut by successively pressing the horizontal reinforcing bar exposed by crushing the end surface of the concrete part by the adjacent blade part 13 and the vertical reinforcing bar bent in the circumferential direction and the radial direction. Is done. That is, since the blade portion 13 meanders in a wavy shape and is directed in two directions of “\” and “/” in a front view, the blade portion 13 can be cut by pressing down a longitudinal reinforcing bar bent in the radial direction.

  The second roller cutter 20 crushes the filled concrete and the inner part of the existing pipe. In this way, the crushed gap is discharged rearward from the window hole 50a provided in the base 50. And even if a gap | sticker adheres between the blade parts 13 and 23 and the blade parts 13 and 23 of the 1st, 2nd roller cutters 10 and 20, this gap is washed away by the water ejected from piping.

  The present invention can be variously modified without being limited to the above embodiment. For example, the first roller cutter 10 can pulverize the concrete portion without unevenness by combining the ones having the blade portions 13 having different shapes, and can cut the rebar more accurately. For example, the blade portion 13 may be a combination of different types of forms as shown in FIGS. 6 (a) and 6 (b), or an arcuate shape having convex curved portions 13a and 23a on only one side. It may be combined with other types.

  Further, the second roller cutter 20 may be provided with a linear blade portion 23 that is not curved or meandered so as not to cut the reinforcing bar, or in accordance with the use situation such as when the filled concrete is not crushed. You do not have to prepare.

  Further, the second roller cutter 20 may be disposed coaxially with the first roller cutter 10, and in this case, in particular, the brackets 30 and 40 may be shared. Furthermore, the angle and the number of the first roller cutters 10 are not limited to those in the above-described embodiment, such as arranging four first roller cutters 10 at 45 ° intervals or arranging three first roller cutters 10 at 120 ° intervals. Further, the second roller cutter 20 may also be arranged between the adjacent first roller cutters 20 (including not only two but also three or more) in addition to the arrangement of the above embodiment. .

10, 20 ......... Roller cutters 10c, 20c ... Center shafts 12, 22 ......... Body parts 13, 23 ...... Blade parts 13a, 23a ... Bending parts 13b, 23b ... Top parts 13c, 23c ... Slopes 30, 40 ... …… Bracket 50 ……………… Base L ………………… Virtual line

Claims (6)

A roller cutter that revolves while rotating while being pressed against the end face of a reinforced concrete pipe in which an annular horizontal reinforcing bar and a straight vertical reinforcing bar are embedded in a cylindrical concrete part,
An arcuate shape in which a large number of blade portions in the direction along the central axis project radially from the outer peripheral surface of the frustoconical or columnar body portion with the rotation axis as the central axis, and the blade portions are curved in the circumferential direction. A roller cutter for crushing reinforced concrete pipes, characterized by being curved in a wavy shape or meandering in a wavy shape.   The blade portion has a pair of inclined surfaces inclined from the top in a Λ-shaped side surface, and two parallel virtual lines that linearly connect the end points of each boundary line between each inclined surface and the outer peripheral surface of the main body portion. 2. The roller cutter for crushing reinforced concrete pipes according to claim 1, wherein the top part is formed to curve or meander between the lines.   The roller cutter for crushing a reinforced concrete pipe according to claim 1 or 2, wherein the blade portion is formed at a ratio of wavelength 38 to 40 with respect to amplitude 1.   A roller cutter according to any one of claims 1 to 3, a base that rotates in a circumferential direction, and a bracket that rotatably fixes the roller cutter to the base with a rotation axis directed in a radial direction. A cutter head for crushing reinforced concrete pipes.   The cutter head for crushing a reinforced concrete pipe according to claim 4, wherein a roller cutter having a different blade shape is fixed to the base.   The cutter head for crushing a reinforced concrete pipe according to claim 4 or 5, wherein the roller cutter according to any one of claims 1 to 3 is also provided in a central portion of the base.

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