WO1998003772A1

WO1998003772A1 - Spiral-shaped roller cutter and tunnel excavator cutter head provided with same

Info

Publication number: WO1998003772A1
Application number: PCT/JP1997/002512
Authority: WO
Inventors: Toyoshi Kuramoto; Hiroshi Takada; Junichirou Okuyama
Original assignee: Komatsu Ltd.
Priority date: 1996-07-22
Filing date: 1997-07-22
Publication date: 1998-01-29
Also published as: EP0915231A4; JPH1037680A; EP0915231A1

Abstract

A spiral-shaped roller cutter (3), which can efficiently and surely cut reinforcement (7) embedded in existing pipes (6), and a tunnel excavator cutter head (1) provided with the same. Thus the spiral-shaped roller cutter (3) is provided with a plurality of spiral-shaped blade portions (3a). Also, the cutter head (1) is provided with respective roller cutters (3, 3) which extend substantially radially of the cutter head and are rotatable about respective axes (2, 2) of rotation.

Description

Description Spiral roller cutter and cutter head of tunnel machine equipped with it

The present invention relates to a spiral roller cutter for cutting a reinforcing bar buried in an existing pipe, and a power cutter head of a tunnel excavator provided with the spiral roller cutter. Background technology

A conventional cutter head for digging and crushing of buried pipes is disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 411-27998. According to the gazette, in FIGS. 7A to 8C, a support arranged radially at predetermined angles around the rotation axis 0, on the front surface of the cutter head 7 1 of the shield machine 61 is provided. A plurality of roller bits 74 to 76 rotatably supported around the axis 0 _{2 to} 0 <are provided. That is, they support axis 0 ₂ a vertical blade type Rorabi' Bok 7 4 the blade portion 7 4 b respectively are formed along a plurality of surfaces including the blade portion 7 5 spirally support axis 0 ₃ about The spiral blade roller bit 75 with b formed thereon and the horizontal blade roller bit 7 with circular blade portions 76 formed at predetermined intervals in the direction of the support axis in a plane orthogonal to the support axis 0 <7 It is composed of six. The shaft portions 74a to 76a of the plurality of mouth rabbits 74 to 76 are rotatably supported by the cutting head 71 via respective bearings 77, 77. . The existing pipe 72 in FIG. 9 includes a concrete pipe wall 72 a, a vertical reinforcing bar 72 b, and a horizontal reinforcing bar 72 c.

Here, the operation of the horizontal blade roller bit 76 will be described. In FIGS. 10A to 10C, four trajectories 76 on the surface to be crushed of the existing pipe 72 by the horizontal blade roller bit 76. Is concentric with the center of rotation 0, of the cutter head 7 1. Therefore, there is almost no possibility of cutting the vertical reinforcing bar 7 2b that is bent in the same direction as the rotation direction S of the cutting head 7 1 with a horizontal blade-type roller bit 76. It is installed to crush pipe wall 72a.

Next, the operation of the vertical blade roller bit 74 will be described. In Figs. 11A to 11C, the multiple tracks 74c on the crushed surface of the existing pipe 72 with the vertical blade roller bit 74 are based on the rotation direction of the cut head 71 and It is almost perpendicular to the vertical reinforcing bar 72b that is bent in the same direction. Therefore, the vertical blade roller bit 74 can cut the vertical reinforcing bar 72 b at the pitch interval of the blade portion 74 b.

Next, the operation of the spiral blade type roller bit 75 will be described with reference to FIGS. 12A to 12B. In the spiral blade type roller bit 75, since the blade portion 75b is formed by a single spiral, the locus 75c (two-dot chain line) is a locus along the rotation direction S, of the cutter head 71. —Displaced by an angle from the dotted line). Thus, head 71 vertical reinforcing bars 7 2 b is bent in the same direction as the rotation of the Katsuta, although slight angle ₂ 2 only direction to the position indicated by a broken line is changed, does not lead before being disconnected . It should be noted that a spiral blade type disk force cutter is also disclosed as another example in Japanese Utility Model Laid-Open Publication No. 11-38995. According to the gazette, in FIGS. 13A to 13B, a small diameter head provided with a disk head 53 having disk cutters 54, 55 at the tip of a leading device 51 is rotatably provided. In the pipe propulsion machine, a single spiral blade 54b, 55b protrudes from the outer peripheral surface of each cutter body 54a, 55a. These spiral blades 54b and 55b also have the same function as the blade portion 75b of the spiral blade roller bit 75.

0

by the way,

(1) The conventional horizontal blade roller bit 76 is provided to crush the concrete pipe wall 72a, and hardly cuts the vertical reinforcing bar 72b.

(2) Since the trajectory 74c on the cutting surface of the conventional vertical blade roller bit 74 is perpendicular to the vertical bar 72b, the vertical bar 72b at the pitch interval of the vertical blade-to-rabbit 74b. Can be cut into chips.

As shown in Fig. 11B, the vertical reinforcing bar 7 2 b is pressed into the concrete pipe by the pressing force F 1 that presses the cutting edge 7 4 b of the vertical blade-type rabbit 7 4 4 4 against the vertical reinforcing bar 7 2 b. 7 2 a I was so entangled that I couldn't get enough reaction force. For this purpose, vertical blade roller bits

There is also a problem that the vertical reinforcing bar 7 2 b cannot be reliably cut even with 7 4.

(3) The conventional spiral blade type mouth-to-rabbit 75 cannot displace the vertical rebar 72 b bent in the same direction as the rotation direction S of the cutter head 71 by a slight angle 0 _2. Possible force <, it is almost impossible to cut the vertical reinforcing bar 7 2 b as shown in Fig. 12 B o

Here, by increasing the angle angle 6 ₂ also increases, easy to cut the vertical reinforcement 7 2 b Kunar. However, in the case of a single spiral blade, if the angle 0, is increased, the pitch of the blade becomes large, so that there is a problem that the vertical reinforcing bar 72b cannot be cut to an appropriate length. Disclosure of the invention

The present invention has been made in order to solve the problems of the related art, and has been made to a spiral roller cutter that can efficiently and surely cut a reinforcing bar buried in an existing pipe, and a cutter of a tunnel machine equipped with the same. The purpose of this is to provide a head.

A first invention of a helical roller force cutter according to the present invention is a helical roller cutter having a helical blade on an outer peripheral surface, wherein a plurality of the helical blades are provided.

By providing a plurality of spiral blade portions, a spiral roller cutter having a large pitch angle and a small interval between blades can be formed. If you try to increase the pitch angle with a conventional single-helical blade, the pitch of the blades will increase, and the distance between the blades will also increase. Therefore, if a plurality of strips are used, another strip can be inserted between the strips, so that even if the pitch angle is increased, the distance between the blades can be narrower and arbitrarily set than in the case of a single strip. .

According to a second invention of a spiral roller force cutter, the plurality of spiral blade portions in the first invention are formed in a tapered shape in a tooth width direction.

With such a configuration, the tooth space gradually widens from the small diameter side to the large diameter side. Therefore, the crushed concrete is easily discharged without clogging the groove. In a third invention of a spiral roller cutter, the pitch angle of the plurality of spiral blade portions in the first or second invention is set to 20 degrees to 80 degrees.

When the pitch angle is increased, the effect of the spiral roller cutter rolling on the cut surface of the rebar decreases. Conversely, if the pitch angle is reduced, the trajectory of the spiral roller cutter rolling on the crushing surface approaches the rotational tangent direction of the cutter head, making it difficult to catch the rebar. Therefore, if the pitch angle of the helical blade is set to 20 to 80 degrees, the tip of the rebar bent in the rotating direction of the cutter head can be easily caught by the helical roller cutter. The rebar caught by the roller cutter is easily cut by the rolling action of the spiral roller cutter. The pitch angle is selected to an appropriate value according to the object to be cut by changing the number of the plurality of strips. The first invention of the power cutter head of a tunnel excavator is based on the power of a tunnel excavator equipped with a rotatable roller cutter around a rotation axis extending substantially in the radial direction of the cutter head. The roller cutter is a spiral roller cutter provided with a plurality of spiral blades on its outer peripheral surface.

With such a configuration, the angle (pitch angle) between the axial direction of the reinforcing steel bent in the rotating direction of the cutter head and the helical blade in the concrete crushing work with the reinforcing steel increases, so that the helical roller cutter is used. Rebar can be cut efficiently with less pressing force for rolling action. Also, since the distance between the blades is small, it is possible to finely crush the reinforcing bars and the like.

Also, by changing the number of strips and selecting a pitch angle appropriate for the object to be cut, the tip of the rebar bent in the rotating direction of the cutter head can be easily caught by the spiral roller force. At the same time, the captured rebar can be easily cut by the spiral roller cutting operation, and the length of the cut rebar can be shortened to approach the pitch length of the helical blade.

Therefore, the following effects can be obtained.

(1) Spiral roller cuts The pressing force of the spiral roller cutter can be reduced. Unlike the vertical blade roller bit in the prior art, the tip of the reinforcing bar is reliably cut without being buried in the concrete.

(2) The tip of the rebar coming out of the concrete is bent in the approximate rotation direction of the cutter head, but the trajectory of the spiral blade of the spiral roller cutter rolling over the tip of the rebar becomes shorter, The cutting area is reduced and the crushing force is reduced. Also, the angle between the cut surface of the reinforcing bar and the axial direction of the reinforcing bar approaches a right angle, and the cut piece of the reinforcing bar becomes shorter. For this reason, the cut pieces do not become entangled with the cut-off head / screw conveyor, and can be easily transported in the same way as ordinary excavated sand.

In a second aspect of the cutter head of the tunnel excavator, in the first aspect of the invention, the helical opening is a two-type spiral in which the plurality of helical blades have mutually opposite pitch angles. It consists of a roller katsuyu.

With this configuration, the trajectories of the two types of spiral roller cutters on the crushing surface of the concrete pipe intersect, so that the reinforcing bar exposed from the crushing surface of the concrete pipe faces the blade groove of one helical roller cutter. Even if it is bent, it can be cut by the other spiral roller cutter.

A third invention of a cutter head of a tunnel machine is that the spiral mouth cutter in the first invention is a spiral roller cutter provided with the plurality of spiral blades, and a circle orthogonal to the rotation axis. Either a disk-shaped roller cutter having a plate-shaped blade or a spiral roller cutter having one spiral-shaped blade is provided.

According to this configuration, the rebar bent in the rotating direction of the cutter head by the plurality of spiral roller cutters can be efficiently cut with a smaller pressing force for the rolling action of the spiral roller cutter. At this time, even if there is a rebar bent in the blade groove direction of the helical blade, the rolling action of the disk-shaped roller cutter or one helical roller cutter causes the same small size as the helical roller cutter. In addition, the rebar is cut efficiently by pressing force.

The fourth invention of the cutter head of the tunnel excavator is based on the plurality of articles in the third invention. The cutting surface of the helical roller cutter provided with the helical blade portion, and the cutting surface of either the disk-shaped roller cutter or the helical roller cutter having one helical blade portion.

However, they are shifted by a predetermined amount in the tunnel excavation direction.

With this configuration, the concrete portion can be crushed by a roller cutter suitable for each process, and then the reinforcing bar can be cut by a cutting surface of another type of roller cutter set behind by a predetermined amount. As described above, since each opening and lacquer suitable for crushing concrete and cutting a reinforcing bar can be selected, the durability of each roller cutter is improved.

According to a fifth invention of a cutter head of a tunnel machine, the cutter head according to the first, second, third, or fourth invention crushes an existing pipe in which hoop rebars are buried. The angle between the fractured surface and the hoop in the unfractured part rotates from an acute angle to an obtuse angle.

With such a configuration, the hoop streak is reliably cut without being entangled with the cutter head, so that the cutting efficiency of the hoop streak is improved. Further, since the hoop streak is cut short, it can be efficiently conveyed in the same manner as ordinary excavated soil without being entangled with the cutter head / screw conveyer. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1A is a front view of a power cutter head of a tunnel machine according to a first embodiment of the present invention, and FIG. 1B is an explanatory view of a crushing action on a crushing surface of an existing pipe by the cutter head of FIG. 1A. It is.

2A is an enlarged front view of the spiral roller cutter of FIG. 1A, FIG. 2B is a side view of FIG. 2A, and FIG. 2C is a perspective view of FIG. 2A.

FIG. 3A is an explanatory diagram of a rolling cutting operation by the spiral roller cutter of FIG. 1A, and FIG. 3B is an explanatory diagram of a crushing operation of a cutter head having different front end positions of outer peripheral portions of two types of roller cutters.

FIG. 4A is a front view of a power head of a tunnel excavator according to a second embodiment of the present invention, and FIG. It is. FIG. 5A is a front view of a power cutter head of a tunnel excavator according to a third embodiment of the present invention, and FIG. 5B is an explanatory view of a crushing action on a crushing surface of an existing pipe by the cutter head of FIG. 5A. Fig. 6A is a perspective view of an existing concrete pipe with hoop reinforcement crushed by the cutter head according to the first, second, or third embodiment, and Fig. 6B is the V of the P part in Fig. 6A. FIG.

FIG. 7A is a longitudinal sectional view of a shield machine according to the related art, and FIG. 7B is a front view of the cutter head of FIG. 7A.

Fig. 8A shows the installation of the spiral bladed roller bit mounted on the cutter head of Fig. 7A, Fig. 8B shows the installation of the horizontal bladed roller bit, and Fig. 8C shows the vertical bladed roller roller bit. FIG.

Fig. 9 is a perspective view of an existing concrete pipe with reinforcing steel in the vertical and horizontal directions.

Fig. 1 O A is an explanatory view of the action of the horizontal blade-type single rabbit on the fracture surface of the existing pipe.

. FIG. 108 is a cross-sectional view of FIG. 108, taken along line 8-8. FIG. 10 (: is a cross-sectional view of FIG.

FIG. 11A is an explanatory view of the operation of the vertical blade type mouth-rabbit on the fracture surface of the existing pipe. FIG. 11B is a sectional view taken along line BB of FIG. 11A, and FIG. 11C is a sectional view taken along line CC of FIG. 11A.

Fig. 12A is an explanatory diagram of the action of the spiral blade type single rabbit on the crushing surface of the existing pipe. FIG. 128 is a sectional view taken along line BB of FIG. 12A.

FIG. 13A is a longitudinal sectional view of another example of the shield machine according to the related art, and FIG. 13B is a front view of the cutter head of FIG. 13A. BEST MODE FOR CARRYING OUT THE INVENTION

The power turf head of the tunnel excavator according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1A to 3B.

The power of the tunnel excavator 1 is one of the power heads 1 as shown in Figure 1A. Helical roller cutters 3, 3 each having a plurality of helical blades 3a in each diametrical direction and near the outer peripheral surface, each of which has a plurality of helical blades 3a. Each is rotatably mounted. At the edge of the mounting hole of each of the spiral roller cutters 3, 3, each power bit 4, 4 is fixed in the rotation direction S, of the power head 1. The details of the spiral roller cutter 3 include a plurality of spiral blade portions 3a as shown in FIGS. 2A to 2C. The plurality of spiral blade portions 3a are formed in a tapered shape in the tooth width direction, and the pitch angle S thereof is, for example, 45 degrees.

In the diametrical direction perpendicular to the rotation axes 2 and 2 of the spiral roller cutters 3 and 3, normal disk cutters 5 and 5 are rotatably mounted.

Next, the crushing action of the existing pipe 6 according to the present embodiment will be described.

Arrow S of Katsutaheddo 1 Figure 1 A, when rotated in the direction, the helical Rorakatsuta 3, 3 is pressed against the crushing surface of the existing pipe 6, respectively rotate in the arrow S ₂ direction. Fig. 1B shows a part of the crushing surface of the existing pipe 6 as viewed in the direction of the propulsion of the tunnel excavator, and the horizontal direction is opposite to Fig. 1A. The tip of the reinforcing bar 7 embedded in the existing pipe 6 protrudes from the crushing surface of the concrete section 8 of the existing pipe 6, but is bent by the cut head 1 in the direction of rotation S, which is the direction of rotation.

The trajectory 10 of the spiral blade portion 3a on the crushing surface of each of the spiral roller cutters 3, 3 rotated by the rotation of the cutter head 1, as shown by a two-dot chain line in FIG. to move the inner circumference of the arrow S ₃ direction while moving in the direction of the tip portion of the reinforcing bars 7 are cut by the trajectory 1 0 to the length of said厶. Here, the pitch of the locus 10 along the axis direction of the reinforcing bar 7 is p, and the angle (= pitch angle) between the rotational tangent of the cutter head 1 and the locus 10 of the spiral blade 3a is 0. If the i diameter of the reinforcing bar 7 is d, the length of the reinforcing bar 7 to be cut is

A L = p + (d / 2 t a n x 2

The length A L of the reinforcing bar 7 is longer than the pitch of the locus 10 by (d / tΆθ).

Here, if the pitch angle 0 of locus 10 is 90 degrees, AL = p

This is equivalent to the vertical blade roller bit 74 of the prior art, and the effect of rolling cutting by the spiral roller cutter 3 cannot be obtained.

That is, if the pitch angle 0 of the trajectory 10 (which is equal to the pitch angle of the helical blade 3a if there is no slip between the helical blade 3a and the crushing surface of the existing pipe 6) is increased, The action of rolling the cutting surface of the reinforcing bar 7 is reduced by approaching the blade roller bit 74. Conversely, when the pitch angle 0 of the locus 10 is reduced, the locus 10 approaches the horizontal blade roller bit 76 of the prior art, and the locus 10 approaches the rotational tangential direction S, of the cutting head 1, and the rebar 7 It becomes hard to catch. Even if the rebar 7 is caught, the angle formed by the axis of the rebar 7 and the cut surface is small, so the cut rebar 7 becomes longer, and is easily entangled with a cutter head 1 ゃ screw conveyer or the like.

Therefore, the force to select an appropriate pitch angle 0 from the range of 20 to 80 degrees according to the object to be cut \ At this time, the intermediate value of 45 degrees (mm L = p + d) is a guideline for selection. Becomes Next, the tip of the reinforcing bar 7 bent in the direction of rotation of the cutter head 1 by a disk cutter 9 corresponding to one pitch of the plurality of spiral blades 3a shown in FIGS. 2A to 2C. FIG. 3A illustrates the case of cutting the slab.

Tip of the rotational direction S reinforcement 7 bent in the same direction as the head 1 to Katsuta, due blade portion 9 a of the disk Katsuta 9 that rotates in S ₂ direction, pressing force on the crushing surface of the concrete portion 8 F Pressed and cut. Thus, since the disk cutter 9 is pressed against the tip of the reinforcing bar 7 while rotating, the reinforcing bar 7 is considerably more easily cut than in the case where the disk cutter 9 is simply pressed against the tip of the bar 7. Therefore, by reducing the pressing force F, the tip of the reinforcing bar 7 is reliably cut without sinking into the concrete portion 8.

In addition, the front end position of the outer peripheral portion of the spiral roller cutter 3 provided with a plurality of spiral blade portions 3a, which is a specific roller cutter, has a disk-shaped roller cutter having a disk-shaped blade portion as another roller cutter. Fig. 9 shows a case where the existing pipe 72 shown in Fig. 9 is crushed by the cutter head 1 installed a predetermined distance L, rearward from the front end position of the outer peripheral part of Fig. 12. This is explained using 3B.

When crushing the existing pipe 72, since the disc-shaped roller cutter 12 is installed L, ahead of the spiral roller cutter 3, the concrete part 72a is first crushed by the disc-shaped roller cutter 12. . A plurality of vertical streaks 72b are exposed from the fracture surface. These vertical streaks 72 b are bent by the cutter head 1 b in the rotation direction, and then cut by the spiral roller cutter 3. As described above, the concrete section 7 2a can be crushed by the disc-shaped roller cut 12 and the vertical streaks 7 2b can be cut by the spiral-shaped roller cut 3. 1 and 2 can be used efficiently.

Next, a second embodiment of the present invention will be described with reference to FIGS. 4A and 4B.

The force cutter head 1a of this embodiment is rotatable by replacing one of the two spiral roller cutters 3, 3 shown in FIG. 1A with a spiral roller cutter 23 having an opposite pitch angle. It is attached to. The other configuration is the same as that of the first embodiment, and a detailed description will be omitted.

The operation of the present embodiment will be described below only for the operation different from that of the first embodiment. When the Katsuta head 1 a is rotated in the arrow direction, since the helical Rorakatsu evening 2 3 is pressed against the broken砕面, is rotated in the arrow S _{2 a} direction. Therefore, as shown by the two-dot chain line rising to the right in FIG. 4B, the spiral blade locus 10a on the crushing surface of the spiral roller cutter 23, which is rotated by the rotation of the cutter head 1a, Crush concrete section 8. The tip of the reinforcing bar 7 protruding from the crushed surface of the crushed concrete portion 8 is bent in the rotation direction S 1 of the cutting head 1a, and then cut by the spiral roller cutter 23.

Further, since the other helical Rorakatsuta 3 also pressed against the crushing surface, it is rotated in the S _2-way direction. Therefore, since the locus 10 is similar to the spiral blade locus 10 shown by the two-dot chain line in FIG. 1B, the tip of the reinforcing bar 7 protruding from the crushed surface of the crushed concrete portion 8 has which is deflected in the rotational direction S ₂ of the head 1 a to, by a helical Rorakatsuta 3 and helical Rorakatsuta 2 3 is finely cut. Next, a third embodiment of the present invention will be described with reference to FIGS. 5A and 5B.

The cutter head 1b of the present embodiment is obtained by replacing one of the two spiral roller cutters 3 and 3 shown in FIG. b is rotatably mounted. The other configuration is the same as that of the first embodiment, and a detailed description will be omitted.

The operation of the present embodiment will be described below only for the operation different from that of the first embodiment. When Katsutahe' de 1 b is rotated in the arrow direction, the disc-shaped Rorakatsuta 1 2 is rotated in the S ₄ direction because it is pressed against the broken砕面. Therefore, as shown by the two-dot chain line in Fig. 5B, the disc-shaped roller force rotated by the rotation of the cutter head 1b, the four blade locuses 11 on the crushing surface of the cutter 12 Crush 8 The tip of the reinforcing bar 7 projecting from the crushed surface of the crushed concrete portion 8 is bent in the rotation direction S, of the cutter head 1b. If the concrete section 8 is crushed by the disc-shaped roller cutter 12 in this manner, the load of crushing the concrete section 8 of the other spiral roller cutter 3 is reduced, so that the cutting properties of the reinforcing bar 7 and the spiral -The durability of Rakatatsu 3 is greatly improved.

In addition, if the crushing surface of the circular roller cutter 12 is installed so as to be a predetermined amount ahead of the cutting surface of the spiral roller cutter 3, the concrete portion 8 can be reliably crushed by the circular roller cutter 12. Thus, the load on the spiral roller force cutter 3 is further reduced, so that the performance is further improved. Next, as shown in Fig. 6A, a plurality of vertical streaks 13 and spiral hoop streaks 7a as horizontal streaks, and the crushing and cutting of the existing pipe 6a embedded in the concrete part 8a will be described. I do.

When this existing pipe 6a is excavated with one of the above-mentioned cut-off heads 1, la, or lb, since the horizontal streak is the hoop streak 7a, the tip of the hoop streak 7a is in the concrete section 8a. It protrudes from the crushing surface 8b while being inclined with respect to the crushing surface 8b. Here, as shown in Fig. 6B, the crushed surface 8b of the existing pipe 6a and the concrete —When the angle between the hoop streak 7 b and the hoop streak 7 b in the head portion 8 a is changed from the obtuse angle S to the acute angle, that is, when the cutter head 1, 1 a, or 1 b is rotated in the arrow X direction, the hoop streak 7 a The hoops 7a are entangled with the cutter head 1 because the hoops 7a rotate toward the base from the tip of the head. Therefore, the concrete portion 8a at the root of the hoop streak 7a on the crushing surface 8b collapses, and a sufficient reaction force against the pressing force of the roller cutters 3, 2, 3 and 12 attached to the cutting head 1 can be obtained. Absent. As a result, the pressing force of each roller cutter 3, 23, 12 decreases, and the hoop streak 7a cannot be reliably cut.

Therefore, when the cutter head 1, 1a, or lb is rotated from the opposite arrow Y direction, the cutter head 1, 7a is rotated from the base of the hoop streak 7a toward the tip. Or not entangled in 1b. Therefore, the pressing force of each roller cutter 3, 23, 12 increases without the concrete portion 8a at the root of the hoop streak 7a on the crushing surface 8b being collapsed. As a result, the hoop muscle 7a can be reliably cut. Note that the cutting of the plurality of vertical streaks 13 is the same as in the related art, and a description thereof will be omitted. Industrial applicability

INDUSTRIAL APPLICABILITY The present invention is useful as a helical roller cutter capable of efficiently and surely cutting a reinforcing bar buried in an existing pipe, and a power cutter head of a tunnel machine including the same.

Claims

The scope of the claims

1. A helical roller cutter (3) having a helical blade on an outer peripheral surface, wherein a plurality of the helical blades (3a) are provided.

2. The spiral roller cutter according to claim 1, wherein the plurality of spiral blades (3a) are formed in a tapered shape in a tooth width direction.

3. The spiral roller cutter according to claim 1, wherein a pitch angle of the plurality of spiral blades (3a) is set to 20 degrees to 80 degrees.

4. In a cutter head of a tunnel excavator equipped with a roller cutter that is rotatable around a rotation axis that extends substantially in the radial direction of the cutter head (1), the roller cutter has a plurality of spirals on its outer peripheral surface. A cutter head for a tunnel excavator, which is a spiral-shaped razor cutter (3) provided with a blade (3a).

5. The helical roller cutter (3) comprises two types of helical roller cutters (3, 23) in which pitch angles of the plurality of helical blades (3a) are opposite to each other. The cutter head of the tunnel machine described in claim 4.

6. The helical roller cutter (3) has a helical roller cutter provided with the plurality of helical blades (3a) and a disk-shaped roller having a disk-shaped blade perpendicular to the rotation axis. 5. The cutter head of a tunnel excavator according to claim 4, further comprising one of a spiral roller cutter having a single spiral blade portion and a spiral roller cutter.

7. The cutting surface of the spiral roller cutter (3) provided with the plurality of spiral blades (3a), and the spiral roller cutter having the disc-shaped roller cutter (12) or the single spiral blade. 7. The cutter head of a tunnel excavator according to claim 6, wherein the one of the cut surfaces is shifted by a predetermined amount in the tunnel excavation direction.

8. When the cutter head (1) crushes the existing pipe (6a) in which the hoop is buried, the cutter head (1) moves between the crushed surface (8b) of the existing pipe and the hoop (7b) in the uncrushed portion (8a). 8. The force excavator head of a tunnel excavator according to claim 4, wherein the angular force makes a rotation from an acute angle direction to an obtuse angle direction.