JPH1037680A - Spiral roller cutter having a spiral blade and cutter head of tunnel machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter head 1 of a tunnel excavator provided with a plurality of spiral roller cutters 3 capable of efficiently and reliably cutting a reinforcing bar 7 buried in an existing pipe 6. SOLUTION: In a cutter head 1 of a tunnel excavator equipped with a roller cutter rotatable around a rotation axis 2 extending substantially in a radial direction of the cutter head 1, the roller cutter has a plurality of spiral blade portions on an outer peripheral surface. A cutter head 1 for a tunnel machine, wherein the cutter head 1 is a spiral roller cutter 3 having 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter head for a tunnel machine having a plurality of spiral roller cutters, and more particularly to a plurality of spiral rollers capable of efficiently and reliably cutting a reinforcing bar embedded in an existing pipe. The present invention relates to a cutter head of a tunnel machine having a cutter.

[0002]

2. Description of the Related Art (1) As a first conventional technique, a description will be given of "Japanese Utility Model Laid-Open No. 4-122798" shown in FIGS. FIG. 7 is an overall view of the shield machine, (A) is a longitudinal sectional view of the shield machine, (B) is a front view of the cutter head, and FIG. 8 is a diagram showing a roller bit mounted on the cutter head. ) Is a mounting diagram of a spiral blade type roller bit, (B) is a mounting diagram of a horizontal blade type roller bit, FIG. 9 is a diagram showing a roller bit mounted on a cutter head and an existing pipe, and (A) is a vertical blade type. FIG. 10 (B) is a perspective view showing an existing pipe, FIG. 10 is an explanatory view of the operation of a horizontal blade roller bit, FIG. 10 (A) is a view showing a crushed surface of the existing pipe, and FIG. ), BB sectional view, (C) is a sectional view taken along the line CC of (A), FIG. 11 is an explanatory view of the operation of the vertical blade roller bit, (A) is a view showing the crushed surface of the existing pipe,
(B) is a sectional view taken along line BB of (A), and (C) is a sectional view taken along line C- of (A).
C is a cross-sectional view, FIG. 12 is an explanatory diagram of the operation of the spiral blade roller bit, (A) is a diagram showing a crushed surface of an existing pipe, and (B) is (A).
FIG.

[0003] In FIG. 7 to FIG.
The cutter head 71 is rotatably supported on support axes O2 to O4 radially arranged at predetermined angles around a rotation axis O1 of the cutter head 71 in a plane along the radial direction. Roller bits 74 to 7
6, a vertical blade-type roller bit 74 having blade portions 74b formed along a plurality of surfaces including the support axis O2, and a blade portion 75b spirally formed around the support axis O3. Helical blade roller bit 75 and support shaft center O4
At a predetermined interval in the supporting axis direction in a plane orthogonal to
6b is formed with a horizontal blade-type roller bit 76 formed thereon. The shaft portions 74a to 76a of the plurality of roller bits 74 to 76 are rotatably supported by the cutter head 71 via bearings 77, respectively. The existing pipe 72 in FIG. 9 (B) has a concrete pipe wall 72a and a vertical reinforcing bar 7.
2b and a horizontal reinforcing bar 72c.

(A) The operation of the horizontal blade roller bit 76 will be described. FIG. 10 is a view showing the crushing surface of the existing pipe 72. Four trajectories 76c on the crushing surface of the existing pipe 72 by the horizontal blade roller bit 76 are concentric with the rotation center O1 of the cutter head 71. The cutter head 71
There is almost no possibility of cutting the vertical reinforcing bar 72b which is bent in the direction of rotation S1 and is installed to crush the concrete pipe wall 72a. (B) The operation of the vertical blade roller bit 74 will be described. FIG. 11 is a view showing the crushing surface of the existing pipe 72. The trajectory 74c on the cutting surface of the vertical blade roller bit 74 shows the vertical reinforcing bar 72 bent in the rotation direction S1 of the cutter head 71.
The vertical reinforcing bar 72b is cut into chips at right angles to the pitch b of the vertical blade-type roller bit 74. (C) The spiral blade roller bit 75 will be described together with the operation of the second prior art described below.

[0005] (2) As a second conventional technique, "Japanese Utility Model Laid-Open No. 1-138995" shown in FIG. 13 will be described. "The leading device 5 attached to the tip of the leading conduit 52 and propelled underground
In a small-diameter pipe propulsion machine in which a cutter head 53 having disk cutters 54 and 55 on the front surface is rotatably provided at the front end of the disk cutter 1, the disk cutters 54 and 55 are spirally formed on the outer peripheral surfaces of the cutter bodies 54a and 55a. Blades 54b, 55b
, A disk cutter device for a small-diameter pipe propulsion machine configured by projecting the same.

FIG. 12 is a view showing a crushed surface of an existing pipe 72. The operation of the spiral blade type roller bit 75 and the second conventional technique will be described. In the spiral blade type roller bit 75 shown in the first prior art and the device shown in the second prior art, as shown in FIG.
Since the blades 5, 54 and 55 are helical, their cutting edges 75
The locus 75c (two-dot chain line) of b, 54b, 55b forms an angle θ1 from the locus (dash-dot line) along the rotation direction S1 of the cutter head 71 (for the reason, see the embodiment of the present invention). Therefore, the vertical reinforcing bar 72b (solid line portion) bent in the rotation direction S1 of the cutter head 71 changes its direction by a slight angle θ2 to the position shown by the broken line, but does not cut.

[0007]

[Problems to be solved by the invention]

(1) Horizontal blade roller bit 76 in the first prior art
Is provided for crushing the concrete pipe wall 72a, and hardly cuts the vertical reinforcing bar 72b. (2) The trajectory 74c on the cutting surface of the vertical blade type roller bit 74 in the first prior art is, as shown in FIG.
Since it is orthogonal to 2b, the vertical reinforcing bar 72b can be cut into chips at the pitch interval of the vertical blade roller bit 74. However, as shown in FIG. 11B, the pressing force F1 for pressing the cutting edge 74b of the vertical blade roller bit 74 against the vertical reinforcing bar 72b causes
The vertical reinforcing bar 72b sinks into the concrete pipe 72a, and a sufficient reaction force cannot be obtained. Therefore, there is a problem that the vertical reinforcing bar 72b cannot be reliably cut. (3) The vertical reinforcing bar 72b (solid line) bent in the rotation direction S1 of the cutter head 71 can be deflected by a slight angle θ2 to the position shown by the broken line, but as shown in FIG. It is almost impossible to cut. Increasing the angle θ1 also increases the angle θ2 indicated by the broken line and makes it easier to cut the vertical reinforcing bar 72b. However, when the pitch angle θ1 is increased with a single spiral, the pitch of the blades increases, so that the vertical reinforcing bar 72b has an appropriate length. There was a problem that could not be cut.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and has a plurality of spiral roller cutters capable of efficiently and reliably cutting a reinforcing bar embedded in an existing pipe. An object of the present invention is to provide a cutter head of an excavator.

[0009]

In order to achieve the above object, a helical roller cutter having a helical blade according to the first invention has a helical roller having a helical blade on its outer peripheral surface. In the shaped roller cutter, the spiral blade portion is formed as a plurality of strips.

According to the first invention, a spiral roller cutter having a large pitch angle and a narrow interval between blades can be formed by forming a plurality of spirals. Because if you try to increase the pitch angle with one blade,
The pitch of the blades is increased, so that the distance between the blades is naturally widened. Therefore, if a plurality of strips are used, the other strips are inserted between the strips, so that even if the pitch angle is increased, the distance between the blades can be set smaller and arbitrarily than in the case of one strip.

A helical roller cutter having a helical blade according to a second invention is characterized in that, in the first invention, the helical blade on the outer peripheral surface is tapered in the face width direction.

According to the second aspect of the present invention, since the helical blade portion on the outer peripheral surface is tapered in the face width direction, the tooth space gradually increases from the smaller diameter side to the larger diameter side. Therefore, the crushed concrete can be easily discharged without clogging the blade groove.

According to a third aspect of the present invention, there is provided a cutter head of a tunnel machine having a roller cutter rotatable around a rotation axis extending substantially in a radial direction of the cutter head. First
Alternatively, the spiral roller cutter according to the second aspect of the present invention is characterized in that it is a spiral roller cutter.

According to the third aspect of the present invention, a spiral roller cutter having a plurality of spiral blade portions is provided on a cutter head of a tunnel excavator, so that in a concrete crushing operation with a reinforcing steel bar, the cutter head rotates in a rotating direction of the cutter head. Since the angle between the axial direction of the bent rebar and the helical blade is increased, the rebar can be efficiently cut with a smaller pressing force for the rolling action of the helical roller cutter. In addition, when the distance between the blades is reduced, the crushing of the reinforcing bar or the like can be performed finely. In addition, by changing the number of the plurality of strips and selecting the size of the pitch angle to an appropriate value according to the cut object, the tip of the rebar bent in the rotating direction of the cutter head is easily captured by the spiral roller cutter, The rebar caught by the spiral roller cutter can be easily cut by the rolling action of the spiral roller cutter, and the length of the cut rebar can be shortened so as to approach the pitch length of the spiral blade.

Therefore, there are the following remarkable effects. (1) The pressing force of the spiral roller cutter can be reduced by cutting the tip of the reinforcing bar by the rolling action of the spiral roller cutter. Therefore, unlike the vertical blade roller bit in the second prior art, the reinforcing bar is easily cut without being buried in the concrete. (2) The tip of the reinforcing bar coming out of the concrete is bent in a substantially rotating direction of the cutter head, but the trajectory of the spiral blade of the spiral roller cutter rolling on the tip of the reinforcing bar becomes short, and the cutting area of the reinforcing bar is reduced. And the crushing force decreases.
In addition, 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, so that the bar is not entangled with the cutter head or the screw conveyor, and is easily transported similarly to ordinary excavated earth and sand.

According to a fourth aspect of the present invention, there is provided a cutter head for a tunnel machine according to the third aspect, wherein a pitch angle of a spiral blade portion of the spiral roller cutter is set to 20 degrees to 80 degrees.

According to the fourth aspect of the present invention, when the pitch angle is large, the action of rolling on the cut surface of the reinforcing bar is reduced, and when the pitch angle is small, the trajectory of the spiral roller cutter rolling on the crushing surface is reduced. In addition, it becomes difficult to catch the rebar when approaching the rotational tangent direction of the cutter head. Therefore, when the pitch angle of the spiral blade is set to 20 degrees to 80 degrees, the tip of the reinforcing bar bent in the rotation direction of the cutter head can be easily captured by the spiral roller cutter, and the reinforcing bar captured by the spiral roller cutter can be easily captured. Is easily cut by the rolling action of the spiral roller cutter. Therefore, the pitch angle of the helical blade is adjusted to a value that can reliably cut the reinforcing steel of the existing pipe according to the cut object.

According to a fifth aspect of the present invention, there is provided a cutter head for a tunnel machine according to the third or fourth aspect, wherein the helical roller cutter comprises two types of helical roller cutters whose pitch angles are opposite to each other. Is attached.

According to the fifth aspect of the present invention, since two types of spiral roller cutters having pitch angles in opposite directions are mounted on the cutter head, two types of spiral rollers on the crushing surface of the concrete pipe are provided. Since the trajectories of the blades of the shaped roller cutter intersect, even if the reinforcing bar exposed from the crushing surface of the concrete pipe may be bent in the blade groove direction of one spiral roller cutter, the other spiral roller cutter may be bent. Can be cut.

The cutter head of a tunnel machine according to a sixth aspect of the present invention is the cutter head according to the third or fourth aspect, wherein the cutter head rotates about a rotation axis extending substantially in the radial direction of the cutter head in addition to the spiral roller cutter having a plurality of strips. It is characterized by being provided with one of a disk-shaped roller cutter having a disk-shaped blade portion freely and having an outer peripheral surface perpendicular to the rotation axis and a spiral roller cutter having a single spiral blade portion.

According to the sixth aspect of the present invention, the rebar bent by the plurality of spiral roller cutters in the rotation direction of the cutter head can be efficiently cut with a smaller pressing force due to 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 and the single helical roller cutter allows the rebar to be efficiently pressed with a small pressing force like the helical roller cutter. Cut well.

According to a seventh aspect of the present invention, in the cutter head of the tunnel machine according to the third to sixth aspects, the cutting surface of the specific type of roller cutter and the cutting surface of the other type of roller cutter are arranged in the tunnel excavation direction. It is characterized in that it is shifted by a predetermined amount.

According to the seventh aspect of the present invention, the concrete portion is crushed by a roller cutter suitable for each process by shifting a different type of roller cutter in the tunnel excavation direction by a predetermined amount in the renewal of the existing pipe. The durability of each roller cutter is greatly improved by cutting the rebar with the cutting surface of another type of roller cutter installed at the rear, crushing concrete, and selecting each roller cutter suitable for cutting the rebar. improves.

According to an eighth aspect of the present invention, there is provided the cutter head of the tunnel machine according to the third to seventh aspects, wherein the cutter head is configured to crush an existing pipe in which a hoop bar is embedded.
The angle between the crushed surface of the existing pipe and the hoop streaks in the uncrushed existing pipe rotates from an acute angle to an obtuse angle.

According to the eighth aspect, when the cutter head is rotated from an acute angle to an obtuse angle between the crushed surface of the existing pipe and the hoop in the concrete, the hoop is entangled with the cutter head. It is surely cut without. Therefore, the cutting efficiency of the hoop streak is improved, and since the rebar is cut short, the cut rebar does not become entangled with the cutter head or the screw conveyor, so that the transport efficiency can be improved in the same manner as ordinary excavated earth and sand.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cutter head of a tunnel machine according to the present invention will be described below in detail with reference to FIGS. FIG. 1 is a view showing a first embodiment of a cutter head of a tunnel machine according to the present invention, FIG. 2 is a detailed view of a spiral roller cutter shown in FIG. 1, and FIG. 3 is an explanation of the operation in the first embodiment of the present invention. FIG. 4 is a diagram showing a second embodiment of the cutter head of the tunnel machine according to the present invention. FIG. 5 is a diagram showing a third embodiment of the cutter head of the tunnel machine according to the present invention.
FIG. 6 is a view showing a concrete pipe with a hoop streak to be crushed by the cutter head of the tunnel machine according to the present invention.

The structure of the first embodiment of the present invention will be described with reference to FIGS. The cutter head 1 of the tunnel machine has two helical blades each having a rotation axis 2 in one diametric direction of the cutter head 1 and a plurality of helical blades 3a having a pitch angle of 45 degrees on the outer peripheral surface. Roller cutter 3,3
Is rotatably mounted. A cutter bit 4 is fixed to the edge of the mounting hole of the spiral roller cutter 3 in the rotation direction of the cutter head 1. Normal disk cutters 5, 5 are rotatably mounted in a diameter direction orthogonal to one diameter direction in which the spiral roller cutters 3, 3 are mounted.

The operation of the configuration shown in FIGS. 1 and 2 will be described with reference to FIG. When the cutter head 1 rotates in the direction of arrow S1, the spiral roller cutter 3 is pressed against the crushing surface of the existing pipe and rotates in the direction of S2. FIG. 1B is a view showing a crushed surface of the existing pipe 6 as viewed in a propulsion direction of the tunnel excavator. Therefore, the horizontal direction is opposite to that in FIG. The tip of the reinforcing bar 7 embedded in the existing pipe 6 protrudes from the crushing surface of the concrete portion 8 of the existing pipe 6, but is bent by the cutter head 1 in the direction of rotation S1 thereof.

The trajectory 10 of the helical blade 3a on the crushing surface of the helical roller cutter 3 rotated by the rotation of the cutter head 1, as shown by a two-dot chain line in FIG. Moving in the S3 direction while moving toward the inner circumferential direction of
Is cut to the length of ΔL. Assuming that the pitch of the locus 10 along the axial direction of the rebar 7 is p, the angle between the rotational tangent of the cutter head 1 and the locus 10 of the spiral blade 3a is θ, and the diameter of the rebar 7 is d, the rebar 7 to be cut is The length ΔL is as follows. ΔL = p + (d / 2tan θ), and (d) is obtained from the pitch p of the trajectory 10 of the spiral blade 3a.
/ 2 tan θ). Therefore, if θ is 90 degrees, ΔL = p, which is the shortest. However, this is equivalent to the vertical blade roller bit 74 of the first prior art, and the effect of rolling cutting by the spiral roller cutter 3 cannot be obtained.

That is, the pitch angle θ of the locus 10 (the spiral blade 3
a) and the crushing surface of the existing pipe 6 do not slip, the pitch angle of the spiral blade portion 3a is increased.
The effect of rolling the cutting surface of the steel sheet is reduced. When the pitch angle θ of the trajectory 10 is reduced, the trajectory of the spiral roller cutter 3 rolling on the cutting surface approaches the horizontal blade roller bit 76 in the second prior art, and the tangential direction of the rotation of the cutter head 1. Approaching S1, it becomes difficult to catch the reinforcing bar 7. Even if the reinforcing bar 7 can be caught, the angle formed by the axis of the reinforcing bar 7 and the cut surface is small, so the cut reinforcing bar 7 becomes longer and is easily entangled with the cutter head or the screw conveyor. Is selected, but 45 degrees is a standard for the above reason.

In FIG. 3A, the disk cutter 9 corresponding to one pitch of the spiral blade 3a of the spiral roller cutter 3 shown in FIGS. 1 and 2 is bent in the rotation direction S1 of the cutter head 1. The cutting action of the tip of the reinforcing bar 7 will be described. Rotation direction S1 of cutter head 1
The tip of the rebar 7 bent in the direction is cut by being pressed against the crushing surface of the concrete portion 8 by the blade portion 9a of the disk cutter 9 rotating in the S2 direction by a pressing force F. Thus, the rebar 7 is rotated while the disk cutter 9 rotates.
By being pressed against the distal end portion, compared with the case where the disk cutter 9 is simply pressed against the distal end portion of the reinforcing bar 7,
Is easily cut, so that the pressing force F of the disc cutter 9 is
Can be reduced. Therefore, the tip of the reinforcing bar 7 is reliably cut by the blade 9a of the disk cutter 9 without sinking into the concrete portion 8.

In FIG. 3B, the front end position of the outer peripheral portion of the helical roller cutter 3 as a specific type of roller cutter is predetermined from the front end position of the outer peripheral portion of the disk type roller cutter 12 as another type of roller cutter. It is installed behind by a distance L1.

Next, the crushing operation of the existing pipe 72 shown in FIG. 9B by the structure of FIG. 3B will be described. Existing pipe 7
2 is crushed by each cutter installed on the cutter head 1, the disc-shaped roller cutter 12 becomes a spiral roller cutter 3.
Since the concrete portion 72a is first crushed by the disc-shaped roller cutter 12, the vertical streak 72b is exposed from the crushed surface since the concrete portion 72a is crushed by the disc-shaped roller cutter 12. This vertical streak 72
b is cut by the spiral roller cutter 3 after being bent in the rotation direction by the cutter head 1. As described above, the concrete portion 72a is crushed by the disk-shaped roller cutter 12, and the vertical streak 72b is cut by the spiral roller cutter 3.
Accordingly, the roller cutters can be used almost exclusively, so that the roller cutters can be used efficiently.

The configuration of the second embodiment of the present invention will be described with reference to FIG. Of the two spiral roller cutters 3 and 3 shown in FIG. 1A, the upper spiral roller cutter 3 in FIG.
Is replaced with a helical roller cutter 23 having an opposite pitch angle and rotatably mounted on the cutter head 1a.
Since it is the same as the cutter head 1 shown in FIG.

The operation of the second embodiment of the present invention will be described with reference to FIG. In FIG. 4, the description of the same parts as those described in FIGS. 1, 2, and 3 is omitted, and only different parts will be described. When the cutter head 1a rotates in the direction of arrow S1, the helical roller cutter 23 is rotated in the direction of S2a because it is pressed against the crushing surface. Accordingly, as shown by a two-dot chain line in FIG. 4B, the concrete portion 8 is crushed by the blade locus 10a on the crushing surface of the spiral roller cutter 23 rotated by the rotation of the cutter head 1a, and the crushing is performed. The tip of the reinforcing bar 7 protruding from the crushed surface of the concrete part 8 is bent in the rotation direction of the cutter head 1 and then cut by the spiral roller cutter 23. Further, since the spiral roller cutter 3 is pressed against the crushing surface, it is rotated in the S2 direction. Therefore, since the blade locus 10 is similar to the blade locus 10 shown by the two-dot chain line in FIG. 1B, the tip of the reinforcing bar 7 projecting from the crushed surface of the crushed concrete portion 8 is After being bent in the direction of rotation, the spiral roller cutter 23 and the spiral roller cutter 3 cut it into small pieces.

The configuration of the third embodiment of the present invention will be described with reference to FIG. One of the two spiral roller cutters 3 and 3 shown in FIG.
The configuration is the same as that of the cutter head 1 shown in FIG. 1 (A) except that the cutter head 1a is rotatably mounted instead of the above, so that detailed description is omitted.

The operation of the third embodiment of the present invention will be described with reference to FIG. In FIG. 5, the description of the same portions as those described in FIGS. 1, 2, and 3 is omitted, and only different portions will be described. When the cutter head 1a rotates in the direction of arrow S1, the disk-shaped roller cutter 12 is rotated in the direction of S4 because it is pressed against the crushing surface. Further, as shown by a two-dot chain line in FIG. 5B, the disk-shaped roller cutter 12 rotated by the rotation of the cutter head 1.
The concrete portion 8 is crushed by the four blade portion trajectories 11 on the crushing surface. The tip of the reinforcing bar 7 projecting from the crushed surface of the crushed concrete portion 8 is bent in the rotation direction of the cutter head 1.

If the concrete portion 8 is crushed by the disc-shaped roller cutter 12 as described above, the load of crushing the concrete portion 8 by the spiral roller cutter 3 is reduced, so that the cutting action of the reinforcing bar 7 and the durability are improved. Significantly improved. Further, if the crushing surface of the disk-shaped roller cutter 12 is installed so as to be ahead of the cutting surface of the helical roller cutter by a predetermined amount, the concrete portion 8 is crushed by the disk-shaped roller cutter 12 without fail. The load of the shaped roller cutter 3 for crushing the concrete portion 8 is further reduced, and the cutting action of the reinforcing bar 7 and the durability are further improved.

A vertical bar 13 and a spiral hoop bar 7a as a horizontal bar are embedded in the concrete portion 8a in the existing pipe 6a shown in FIG. When the existing pipe 6a is excavated by the cutter head 1 or 1a of the present invention, since the horizontal streak is the hoop streak 7a, the tip of the hoop streak 7a is inclined with respect to the crush surface 8b of the concrete portion 8a. 8b
Protruding from. Therefore, when the cutter head 1 is rotated in the direction of the arrow X from the obtuse angle β to the acute angle α, the angle between the crushing surface 8b of the existing pipe 6a and the hoop streak 7b in the uncrushed existing pipe shown in FIG. Since the cutter head 1 rotates from the tip of the streak 7a toward the base, the hoop streak 7a is entangled with the cutter head 1. Therefore, the crushing surface 8
b. Concrete part 8a at the root of hoop streak 7a
Of the roller cutters 3, 23, and 12 mounted on the cutter head 1, and the pressing force of each of the roller cutters 3, 23, and 12 decreases, and the hoop streaks 7a are reduced. Cannot be cut reliably.

When the cutter head 1 is rotated in the direction of the arrow Y, the cutter head 1 rotates from the base of the hoop streak 7a toward the tip thereof.
Is not entangled with the cutter head 1. Therefore, the concrete portion 8 at the root of the hoop 7a on the crushing surface 8b
Thus, the pressing force of each of the roller cutters 3, 23, 12 increases without hindering the hoop line 7a. Note that the cutting of the vertical stripes 13 is the same as that of the related art, and thus the description is omitted.

[Brief description of the drawings]

1A and 1B are views showing a first embodiment of a cutter head of a tunnel machine according to the present invention, wherein FIG. 1A is a front view of the cutter head, FIG. It is.

FIG. 2 is a detailed view of the spiral roller cutter shown in FIG. 1,
(A) is a front view, (B) is a side view, and (C) is a perspective view.

FIG. 3 is an operation explanatory view of the first embodiment of the present invention;
(A) is a figure which shows the rolling cutting action by a spiral roller cutter, (B) is a figure which shows the crushing action of the cutter head from which each front end position of two types of roller cutter outer peripheral parts differs.

4A and 4B are views showing a second embodiment of the cutter head of the tunnel machine according to the present invention, wherein FIG. 4A is a front view of the cutter head, FIG. It is.

5A and 5B are views showing a third embodiment of a cutter head of a tunnel machine according to the present invention, wherein FIG. 5A is a front view of the cutter head, FIG. It is.

FIG. 6 is a view showing a concrete pipe with a hoop streak to be crushed by a cutter head of a tunnel machine according to the present invention, wherein (A) is an external perspective view, and (B) is a V arrow of a P portion of (A). FIG.

FIG. 7 is an overall view of a shield machine showing a first prior art, in which (A) is a longitudinal sectional view of the shield machine and (B) is a front view of a cutter head.

8A and 8B are views showing a roller bit mounted on the cutter head of FIG. 6, wherein FIG.
(B) It is an installation drawing of a horizontal blade type roller bit.

9A and 9B are views showing a roller bit and an existing pipe mounted on the cutter head of FIG. 6, wherein FIG. 9A is a view showing the installation of a vertical blade roller bit roller bit, and FIG. 9B is a perspective view of the existing pipe.

FIG. 10 is an operation explanatory view of the horizontal blade roller bit of FIG. 7;
(A) is a view showing a crushed surface of an existing pipe, and (B) is a view of (B) in (A).
FIG. 2B is a cross-sectional view, and FIG. 2C is a CC cross-sectional view of FIG.

11 is an operation explanatory view of the vertical blade roller bit of FIG. 8;
(A) is a view showing a crushed surface of an existing pipe, and (B) is a view of (B) in (A).
FIG. 2B is a cross-sectional view, and FIG. 2C is a CC cross-sectional view of FIG.

12A and 12B are explanatory diagrams of the operation of the spiral blade type roller bit of FIG. 7, in which FIG. 12A shows a crushing surface of an existing pipe, and FIG.
FIG.

13A and 13B are diagrams showing a second conventional technique, wherein FIG. 13A is a front view of a shield machine, FIG. 13B is a cross-sectional view taken along line BB of FIG.
It is a longitudinal section of a shield machine.

[Description of Signs] 1, 1a, 1b: Cutter head, 2: Rotation axis, 3, 2
3 helical roller cutter, 3a, 23a helical blade,
4: Cutter bit, 5: Disk cutter, 6, 6a: Existing pipe, 7: Reinforcing bar, 7a, 7b: Hoop bar, 8, 8a: Concrete part, 8b: Crushing surface, 9: Disk cutter, 9
a: blade portion, 10, 10a: helical blade locus, 11: disk-shaped roller cutter blade locus, 12: disk-shaped roller cutter,
13 ... vertical streaks.

Claims (8)

[Claims] 1. A helical roller cutter having a helical blade on its outer peripheral surface, wherein the helical blade has a plurality of helical blades. 2. A helical roller cutter having a helical blade according to claim 1, wherein the helical blade on the outer peripheral surface is tapered in a tooth width direction. Shaped roller cutter. 3. A helical roller according to claim 1 or 2, wherein the roller cutter is provided with a roller cutter rotatable about a rotation axis extending substantially in the radial direction of the cutter head. A cutter head for a tunnel machine, which is a cutter. 4. The cutter head for a tunnel machine according to claim 3, wherein the spiral blade of the spiral roller cutter has a pitch angle of 20 to 80 degrees. . 5. The cutter head according to claim 3, wherein said spiral roller cutter comprises two types of spiral roller cutters having pitch angles in directions opposite to each other. Cutter head of tunnel machine. 6. The cutter head according to claim 3, wherein the cutter head is rotatable about a rotation axis extending substantially in the radial direction of the cutter head and the outer peripheral surface, in addition to the spiral roller cutter having a plurality of strips. And a spiral roller cutter having a disk-shaped blade portion orthogonal to the rotation axis and a spiral roller cutter having a single spiral blade portion. 7. A cutter head for a tunnel excavator according to claim 3, wherein a cutting surface of said specific type of roller cutter and a cutting surface of another type of roller cutter are displaced by a predetermined amount in the tunnel excavation direction. A cutter head for a tunnel machine. 8. The cutter head of a tunnel machine according to claim 3, wherein the cutter head is configured to crush a surface of an existing pipe and a hoop in an uncrushed existing pipe when crushing an existing pipe in which a hoop bar is buried. A cutter head for a tunnel excavator, wherein an angle formed by a streak rotates from an acute angle to an obtuse angle.