JPH1037676A - Cutter head for tunneling machine and crushing method of existing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut reinforcements such as vertical reinforcements buried to an existing pipe made of reinforced concrete efficiently and surely by installing a vertical-reinforcement bending means in a small-bore pipe excavator laying a new pipe while crushing the existing pipe. SOLUTION: Notch type roller cutters 12, 12 are mounted rotatably on a cutter head 10 set up to the leading pipe 3 of a small-bore pipe excavator, and the vertical reinforcements of an existing pipe projected from a cut surface are bent forcibly in the direction of rotation of the cutter head 10 from the roots of the vertical reinforcements by the web sections of the notches of the roller cutters 12, and cut by the edge sections of the notches. The reinforcements are bent forcibly in the direction of rotation of the cutter head 10 by a cutter- head face plate or a roller and cut by a gear type roller cutter as another plan. The cutter-head face plate is formed in a projecting or recessed conical shape, and the vertical reinforcements may also be bent. Accordingly, the vertical reinforcements can be cut efficiently and surely by forcibly bending the vertical reinforcements of the existing pipe projected from the cut surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter head of a tunnel excavator and a method of crushing an existing structure, and more particularly to a tunnel excavator having a vertical streak bending means for bending a vertical streak embedded in an existing structure. The present invention relates to a cutter head and a method of crushing an existing structure capable of efficiently and reliably cutting a vertical streak embedded in the existing structure.

[0002]

[Prior art]

(1) As a first conventional technique, “Japanese Utility Model Laid-Open No. 4-122798” shown in FIGS. 9 to 11 will be described. "In front of the cutter head 71 of the shield machine 61, the support axes O2 to O4, which are radially arranged at predetermined angles around the rotation axis O1 of the cutter head 71 in a plane extending in the radial direction, respectively, A plurality of rotatably supported roller bits 74, 75, 76 are provided,
A vertical blade type roller bit 74 having a blade portion formed along a plurality of surfaces including the support axis O2, and a spiral blade type having a blade portion formed helically around the support axis O3. A roller bit 75 and a horizontal blade roller bit 76 having circular blade portions formed at predetermined intervals in the support axis direction in a plane orthogonal to the support axis O4. "

The operation of each of the roller bits 74 to 76 alone in the first prior art having the above configuration will be described. (A) The operation of the horizontal blade roller bit 76 will be described with reference to FIG. FIG. 12 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
The vertical streak 72b bent in the rotation direction S1 cannot be cut, and mainly crushes the concrete pipe wall 72a. (B) The operation of the vertical blade roller bit 74 will be described with reference to FIG. FIG. 4 is a view showing a crushing surface of an existing pipe 72. A locus 74c on a cutting surface of a vertical blade roller bit 74 is a vertical streak 7 which is bent in the rotation direction S1 of the cutter head 71.
It is cut into chips having a pitch length orthogonal to 2b. (C) Operation of spiral blade type roller bit 75 FIG. 14
This will be described below. The vertical stripe 72b (solid line) bent in the rotation direction S1 of the cutter head 71 is deflected by a slight angle θ2 to the position shown by the broken line, but the roller bit 75 cannot cut the vertical stripe 72b. However, the cutter head 71 of the first prior art is provided with a plurality of roller bits 74, 75, and 76, and by their interaction, a reinforcing bar 72 composed of a horizontal bar 72a and a vertical bar 72b is provided.
Has caused fatigue fracture.

[0004] (2) Japanese Patent Application No. Hei 8-130844, which has been filed as a second prior art, will be described with reference to FIGS. The cutter head 82 is provided with two tapered disk cutters 84 having respective rotation axes in the outer peripheral portion in the radial direction.
And two tapered roller cutters 85 are installed at substantially point symmetric positions with respect to the center. In other radial directions, a straight disk cutter 86 and a straight roller cutter 87 having respective rotation axes in the radial direction are provided at point symmetric positions with respect to the center on the inner peripheral portion of the cutter head 82. . Further, a cutter bit 89 having a cutting edge in the rotation direction of the cutter head 82 is provided in a mounting opening of the two taper type disk cutters 84 and the taper type roller cutter 85.

In FIG. 17, the outer peripheral portion of the straight roller cutter 87 in the tunnel excavation direction is located a predetermined distance L1 behind the outer peripheral portion of the tapered disk cutter 84 in the tunnel excavation direction. Further, the front end position of the cutter bit 89 in the tunnel excavation direction is located behind the front end position of the outer periphery of the straight roller cutter 87 by a predetermined distance L2.

Next, the crushing action of the existing pipe 72 by the cutter head 82 shown in FIG. 15 will be described with reference to FIGS. When the existing pipe 72 is crushed by each of the cutters installed on the cutter head 82 to reach the vicinity of the horizontal streak 72c, the tapered disk cutter 84 is installed L1 ahead of the straight roller cutter 87, and L1 is inserted from the cutter bit 89. + L2, the ring-shaped horizontal streak 72c connected to the vertical streak 72b
The crushed surface crushed by the tapered disk cutter 84 is exposed forward. When the cutter head 82 rotates in this state, the horizontal streak 72c firmly supported on the crushing surface of the existing pipe 72 via the vertical streak 72b by the tapered roller cutter 85 and the straight roller cutter 87 installed on the cutter head 82. Is cut into fine chips 73c by the rotation of each roller cutter. Then, the horizontal line 72c
The vertical streaks 72b firmly supported on the crushing surface of the existing pipe 72 in a state in which the vertical streaks 72b connected together by the
3b.

A third prior art is disclosed in Japanese Patent Laid-Open No. 7-28.
First, a starting shaft 91 is provided on one side of the update section, and a reaching shaft 92 is provided on the other side. At this time, if necessary, both ends of the non-updated existing pipe 97 are stopped by appropriate means. Next, in the renewal section, the existing pipe 97 other than the one removed by the construction of the shaft is filled with the plugging material 95 to close the pipe near the pressure of the surrounding ground 93, preferably at the same pressure as the surrounding ground pressure. . Thus, the closing material 95
After the existing pipe 97 is closed, the excavator 90 excavates from the starting shaft 91 along the existing pipe 97, and a new pipe 96 is propelled and laid using the jack 98.

[0008]

[Problems to be solved by the invention]

(1) In the first prior art, a plurality of roller bits 74 composed of a vertical blade roller bit 74, a spiral blade roller bit 75, and a horizontal blade roller bit 76 rotatably supported on the front surface of a cutter head 71. , 75, 76, the horizontal streak 7
Since the reinforcing bar composed of the longitudinal bar 2c and the vertical bar 72b is broken by fatigue, the time required for cutting is long and the efficiency is low. (2) Further, according to the first conventional technique, the vertical streak 72b is not bent in a fixed
Vertical streak 7 bent in any direction by 4,75,76
Since only the 2b is cut or the longitudinal streaks 72b are bent one after another in another direction to cause fatigue failure, there is a case where it is crushed in the digging direction and becomes an obstacle to propulsion.

(3) As in the second prior art, the vertical streak 72b protruding from the crushing surface is directly scraped off by the cutter bit 89, so that it is cut off unnecessarily small and the efficiency is poor. As shown in FIG. 17B, the vertical streak 72b is cut off by the cutter bit 89, so that the wear resistance of the cutter bit 89 is reduced. (4) In the third prior art, a plugging material 95 is provided in the existing pipe 97.
Is described, and the existing pipe 97 is excavated in a state close to the pressure of the surrounding ground 93.
No countermeasures are described for cases where steel bars are reinforced. As described above, each conventional technique has a problem that long distance excavation cannot be performed due to a decrease in excavation efficiency or durability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and a cutter for a tunnel excavator capable of efficiently and reliably cutting a reinforcing bar such as a vertical bar embedded in an excavated body. An object of the present invention is to provide a crushing method when the head and the excavated body are existing structures.

[0011]

Means for Solving the Problems and Action / Effect To achieve the above object, a cutter head of a tunnel excavator according to a first aspect of the present invention includes a vertical streak embedded in a tunnel excavation direction of the tunnel excavator. In a cutter head of a tunnel machine for excavating an excavated body, a vertical streak bending means for forcibly bending a vertical streak protruding from an excavation surface of the excavated body in a predetermined direction from a root thereof is provided. I do.

[0012] According to the first aspect, since the vertical streaks protruding from the crushing surface are bent from the root thereof, they are firmly supported by the excavation surface, and are cut after being forcibly bent in a predetermined direction. , Is surely cut. Further, the following effects are obtained. (1) Since the vertical streak can be bent in a direction in which stable press cutting or rolling cutting can be performed, the cutter attached to the cutter head has a long life, and long-distance excavation is possible. (2) By selecting the direction in which the vertical streaks are bent, the vertical streaks can be cut quickly instead of causing fatigue damage as in the first prior art, and the cutting efficiency is improved because the cutting is performed reliably and neatly. Is improved. (3) Since the direction in which the vertical streaks are bent can be selected to make the vertical streak cut pieces into strips, the transfer efficiency is improved without clogging the transfer means. (4) If the direction in which the longitudinal streak is bent is selected, and the longitudinal streak is bent in a direction other than the propulsion direction and cut as a unitary bend in the vicinity of the cut surface, the longitudinal streak does not become a so-called dumpling shape, thereby facilitating propulsion. .

A cutter head of a tunnel machine according to a second aspect of the present invention is characterized in that, in the first aspect, the cutter head comprises a cutter provided with the vertical streak bending means.

According to the second aspect, the vertical streaks bent by the vertical streak bending means provided in the cutter are cut by the cutter. Therefore, it is not necessary to provide a separate vertical line bending means in addition to the cutter for cutting the vertical line, so that the apparatus can be made compact.

According to a third aspect of the present invention, there is provided a cutter head of a tunnel machine according to the second aspect, wherein the cutter is a notch-type roller cutter having a notch-shaped blade.

According to the third aspect, the longitudinal streak is bent in the rotational direction of the cutter by the abdomen of the notch-type roller cutter, and then cut by the notch-type roller cutter. Therefore, the notch-type roller cutter has a simple configuration and does not require a separate vertical streak bending means, so that the cost can be reduced.

According to a fourth aspect of the present invention, there is provided a cutter head of a tunnel machine according to the first aspect, further comprising a vertical streak bending means separate from the cutter installed on the cutter head.

According to the fourth aspect, if the vertical streak bending means separate from the cutter and dedicated to the vertical streak bending is used, the cutter can be freely configured without being restricted by the shape of the cutter. Therefore, the effects described in the first invention can be made the best.

According to a fifth aspect of the present invention, in the cutter head of the tunnel machine according to the fourth aspect, the vertical streak bending means is a roller-shaped vertical streak bending means.

According to the fifth aspect of the present invention, since the roller-shaped vertical streak bending means causes the friction with the vertical streak to be rolling friction, the force acting on the roller can be reduced and the driving force of the cutter head can be reduced.

According to a sixth aspect of the present invention, the cutter head of the tunnel machine according to the first aspect is arranged such that:
It is a cutter head face plate.

According to the sixth aspect, the vertical streak projecting from the excavation surface is cut after being forcibly bent in the rotation direction of the cutter head by the cutter head face plate. Therefore, the cutter head is inexpensive because there is no restriction on the shape of the cutter and there is no need to attach a vertical streak bending means.

According to a seventh aspect of the present invention, the cutter head of the tunnel excavator according to the sixth aspect is characterized in that the cutter head face plate is convex in the excavation direction of the tunnel excavator.

According to the seventh aspect, the vertical streaks protruding from the excavation surface are bent in the rotation direction of the cutter head by the cutter head face plate. However, since the cutter head face plate is convex in the excavation direction, the rotation direction of the cutter head is changed. From a predetermined angle outward. Therefore, since the cutter head face plate itself has the function of the vertical streak bending means, it has the simplest configuration as the vertical streak bending means, and the cutter head is inexpensive.

According to an eighth aspect of the present invention, the cutter head of the tunnel excavator according to the sixth aspect is characterized in that the cutter head face plate is concave in a direction in which the tunnel excavator excavates.

According to the eighth aspect, the vertical streaks protruding from the excavation surface are bent by the cutter head face plate in the rotation direction of the cutter head. However, since the cutter head face plate is concave in the excavation direction, the rotation direction of the cutter head is reduced. From a predetermined angle. Therefore, there is an effect similar to that of the seventh invention.

According to a ninth aspect of the present invention, there is provided a method for crushing an existing structure, the method comprising digging an object to be excavated including a vertical streak embedded in a tunneling machine excavation direction while excavating the vertical streak protruding from the crushed surface. A method of crushing an existing structure in which a bent pipe is excavated while cutting the pipe while cutting the pipe, wherein the vertical streak is forcibly bent in a predetermined direction from a root thereof.

According to the ninth aspect, since the vertical streaks projecting from the crushing surface are bent from the root thereof, they are firmly supported by the crushing surface and cut after being forcibly bent in a predetermined direction. , Is surely cut. Therefore, there is an effect similar to that of the first invention.

A crushing method for an existing structure according to a tenth invention is characterized in that, in the ninth invention, a vertical streak of the existing structure is bent in a direction of a cut surface.

According to the tenth aspect, the vertical streaks bent in the direction of the cut surface are immediately cut. Therefore, the cutting efficiency is improved because the longitudinal stripes are reliably cut.

A method for crushing an existing structure according to an eleventh invention is characterized in that, in the ninth invention, a vertical streak of the existing structure is bent in a rotating direction of the cutter head.

According to the eleventh aspect, since the vertical stripes are originally bent in the rotation direction of the cutter head, the vertical stripes are easily bent in this direction.

A method for crushing an existing structure according to a twelfth invention is characterized in that, in the ninth invention, the existing structure is bent in a predetermined direction near a cut surface of the vertical streak.

According to the twelfth aspect, since the vertical streak is firmly supported by the existing structure and cuts the portion, it can be easily cut by the cutter and can be cut reliably.

According to a thirteenth aspect of the present invention, in the method for crushing an existing structure according to the ninth to twelfth aspects, the existing structure is an existing pipe, and the inside of the existing pipe is filled with a filler and then crushed. It is characterized by the following.

According to the thirteenth aspect, even in the case of an existing structure having vertical streaks, the existing structure can be stably crushed in a state close to the surrounding ground pressure as in the third conventional technique.

According to a fourteenth aspect of the present invention, in the ninth to thirteenth aspects of the present invention, the existing structure is an existing pipe having a hoop streak. The present invention is characterized in that an existing pipe is crushed by rotating a cutter head from an acute angle to an obtuse angle with a hoop in the pipe.

According to the fourteenth aspect, when the cutter head is rotated from an acute angle to an obtuse angle between the crushing surface and the hoop in the existing structure, the hoop is hardly entangled with the cutter head. Hoop muscles can be reliably cut. Accordingly, the cutting efficiency of the hoop streak can be improved, and the cut hoop streak can be cut short, so that the cut hoop streak does not become entangled with the cutter head or the screw conveyor, and the transport efficiency can be improved in the same manner as ordinary excavated soil.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cutter head of a tunnel machine and a method of crushing an existing structure according to the present invention will be described below in detail with reference to FIGS. FIG. 1 is an overall view showing a small-diameter pipe propulsion method using a small-diameter pipe propulsion machine equipped with a cutter head of a tunnel excavator according to the present invention, and FIG. 2 is a detailed view of an existing pipe with a hoop bar as an existing structure. 3 is a view showing a first embodiment of the cutter head according to the present invention, FIG. 4 is a view showing a cutting action of a vertical streak by the notch type roller cutter of FIG. 3, and FIG. 5 is a vertical streak by the notch type roller cutter of FIG. And FIG. 6 shows a second embodiment of the cutter head according to the present invention, FIG. 7 shows a third embodiment of the cutter head according to the present invention, and FIG. It is a figure showing a 4th example and a 5th example of a cutter head concerning the present invention.

In FIG. 1, first, a starting shaft 1 and a reaching shaft 2 are constructed, and then a propulsion device 4 for a leading pipe 3 of a small-diameter pipe propulsion machine is installed in the starting shaft 1. The propulsion unit 4 rotates the cutter head 10 rotatably mounted on the leading pipe 3 of the small-diameter pipe propulsion machine while rotating the cutter head 10 via the newly installed pipe 6.
, A new pipe 6 is laid while the existing pipe 5 is crushed by the cutter head 10. At this time, as shown in FIG. 11B or FIG.
Since it is necessary to crush the concrete and cut the reinforcing bars constituting the existing pipes 72 and 5a, to stably propel the small-diameter pipe propulsion machine, first fill the interior of the existing pipes 72 and 5a with mortar or the like, and then surround the pipe. The existing pipe 7
2, 5a are crushed.

In FIG. 2, the existing pipe 5 containing the hoop 7 is shown.
In a, the existing pipe 5a is reinforced by embedding the hoop bar 7 and the vertical bar 8 in the concrete 9. Such existing pipe 5
When “a” is crushed by the cutter mounted on the cutter head 10, the tip of the hoop streak 7 protrudes from the crushing surface 5 b while being inclined with respect to the crushing surface 5 b of the existing pipe 5 a. Therefore, as shown in FIG. 2, when the angle between the crushing surface 5b and the hoop 7 in the existing pipe 5a is changed from the direction of the obtuse angle β to the direction of the acute angle α, that is, the cutter head 10 is rotated in the direction of the arrow Y, Since the cutter head 10 rotates from the tip to the base, the hoop streak 7
Entangled with. Accordingly, the concrete 9 at the base of the hoop 7 on the crushing surface 5b collapses, and a sufficient reaction force against the pressing force of the roller cutters 12, 14 mounted on the cutter head 10 cannot be obtained.
Is reduced, and it becomes difficult to cut the hoop line 7 reliably.

When the cutter head 10 is rotated in the direction from the acute angle α to the obtuse angle β, that is, the arrow X direction, the angle between the crushing surface 5b and the hoop 7 in the existing pipe 5a, the root of the hoop 7 The cutter head 10 rotates from the top to the tip, so that the hoop streaks 7
There is no entanglement. Therefore, the pressing force of the roller cutters 12 and 14 is increased without breaking the concrete 9 at the root of the hoop streak 7 on the crushing surface 5b, and
Can be reliably cut.

The configuration of the first embodiment of the present invention will be described with reference to FIG. The cutter head 10 mounted on the leading pipe 3 of the small-diameter pipe propulsion machine is driven to rotate by a screw conveyor 11 extending backward in the center of the leading pipe 3. The cutter head 10 has a notch-shaped roller cutter 12 having two notch-shaped blades at a point symmetrical position with respect to the center of rotation.
12 is rotatably mounted. Two disc cutters 13, 13 are rotatably mounted at positions perpendicular to the rotation axes of the notch-type roller cutters 12, 12, respectively.

In the first embodiment, the existing pipe 5 shown in FIG.
The cutting action of the vertical streaks 8 of FIG.
In the first state shown in FIG. 4A, the concrete 9 is crushed by the cutting edge 12a of the first notch 121,
The first vertical streak 81 is bent in the direction of rotation M of the cutter head 10 by the abdomen 12b of the notch 121. In the second state shown in (B), the first vertical streaks 81 bent by the abdomen 12b of the first notch 121 are cut by the cutting edge 12a of the second notch 122. The third notch 123
The second vertical line 82 bent by the abdomen 12b is cut by the cutting edge 12a of the fourth notch 124.

In the first embodiment, the existing pipe 5 shown in FIG.
The cutting action of the hoop muscle 7a will be described with reference to FIG. Note that the cutting of the vertical stripes 8 has been described with reference to FIG. In the first state shown in FIG.
The concrete 9 is crushed by the cutting edge 12a of the notch 121, and the hoop 7 is bent in the rotation direction M of the cutter head 10 by the abdomen 12b of the first notch 121. In the second state shown in (B), the first notch 121
The hoop muscle 7 bent by the abdomen 12b of the
It is cut by the cutting edge 12a of the notch 122. As described above, in the first embodiment, after the longitudinal bar 8 and the hoop bar 7 of the existing pipe 5a are forcibly bent in the rotation direction M of the cutter head 10 on the cutter head 10 of the leading conduit 3,
A notch-type roller cutter 12 designed for cutting is used.

The configuration of the second embodiment of the present invention will be described with reference to FIG. A notch type roller cutter 1 is provided at a point symmetrical position with respect to the rotation center of the cutter head
Instead of 2 and 12, gear-shaped roller cutters 14 and 14 having two gear-shaped blades are rotatably mounted. Since the gear-shaped roller cutter 14 does not include the abdominal portion 12b as a vertical streak bending means like the notch-shaped roller cutter 12, the gear-shaped roller cutter 14 has a mounting portion in the rotation direction of the cutter head 10a for mounting the gear-shaped roller cutter 14. U-shaped vertical streak bending means 15, 15 are separately installed. Other configurations are the same as those in FIG.

The operation of the second embodiment will be described with reference to FIG. When the cutter head 10a rotates in the direction of arrow M and the gear-type roller cutter 14 rotates in the direction N, FIG.
The longitudinal streaks 72b of the existing pipe 72 shown in (B) or the tips of the longitudinal streaks 8 of the existing pipe 5a shown in FIG. 2 are cut as follows. (1) As shown in (B), the tip of the vertical stripe 8 hits the top plate 15a of the vertical stripe bending means 15, and the side plates 15b, 15 on both sides.
The bending direction is regulated by b, and the cutter head 10a is bent in the rotation direction M direction. (2) When the cutter head 10a rotates and the cutter head 10a advances in the M direction as shown in FIG. 3C, the concrete 9 is crushed by the first blade portion 141 and the vertical streak is formed on the second blade portion 142. 8 hits. (3) As shown in (D), when the cutter head 10a further advances in the M direction, the concrete 9 near the root of the vertical streak 8 is crushed by the second blade portion 142, and the vertical streak 8 becomes the third blade portion. By 143, it is slightly pushed into the concrete 9 and stabilized. (4) When the cutter head 10a rotates and the cutter head 10a further advances in the M direction as shown in FIG. 7E, the vertical streak 8 is cut by the third blade portion 143.

The configuration of the third embodiment of the present invention will be described with reference to FIG. Except that the roller-shaped vertical streak bending means 16 and 16 are provided to configure the cutter head 10b, the description is omitted because it is the same as FIG. 6, and only different parts will be described. The roller-shaped vertical streak bending means 16 is rotatably supported on both sides thereof by a cutter head 10b via bearings (not shown).

The operation of the third embodiment of the present invention will be described with reference to FIG. The description of the same operation as in FIG. 6 will be omitted, and only different portions will be described. When the cutter head 10b rotates in the direction of arrow M, the tip of the vertical streak 8 is cut as follows. (1) When the cutter head 10b rotates and the cutter head 10b advances in the direction of arrow M as shown in (B), the vertical stripes 8 hit the roller-like vertical stripe bending means 16. (2) When the cutter head 10b rotates and further advances in the direction of arrow M as shown in (C), the longitudinal stripes 8 are bent in the rotational direction M of the cutter head 10b by the roller-like longitudinal stripe bending means 16, and The concrete 9 is crushed by the first blade portion 141, and the vertical streaks 8 hit the second blade portion 142. (3) When the cutter head 10b rotates and further advances in the direction of arrow M as shown in (D), the concrete 9 at the root of the longitudinal streak 8 is crushed by the second blade portion 142, and
The vertical streaks 8 are slightly pushed into the concrete 9 by the third blade portion 143 and are stabilized. (4) When the cutter head 10b rotates and further advances in the direction of arrow M as shown in FIG. 7 (E), the vertical stripes 8 are cut by the third blade portion 143. It is also possible to install side plates similar to the side plates 15b, 15b on both sides shown in FIG. 6 on both sides of the roller-shaped vertical streak bending means 16 so as to more precisely regulate the bending direction of the vertical streaks 8.

The configuration of the fourth embodiment of the present invention will be described with reference to FIGS. As shown in (B), the cutter head 10c of this embodiment includes a cutter head face plate 17 having a convex conical shape in the excavation direction, and the convex conical cutter head face plate 17 acts as a vertical streak bending means. . Therefore, U-shaped vertical streak bending means 15, 1 as shown in FIG.
There is no need to separately install a vertical streak bending means such as 5. (A)
As shown in FIG. 6, at the point symmetric position with respect to the rotation center O of the cutter head 10c, similarly to the cutter head 10a of FIG.
Two gear type roller cutters 14, 14 are rotatably mounted. Although not shown in (A), the disk cutters 13, 13 similar to FIG. 6 are provided in a diameter direction orthogonal to the rotation axis direction of the two gear-type roller cutters 14, 14.
Is rotatably mounted.

The operation of the fourth embodiment having the above configuration will be described. When the cutter head 10c rotates in the direction of arrow M and the gear-type roller cutter 14 rotates in the direction N, the vertical stripes 8 of the existing pipe 5a shown in FIG. 2 or the vertical stripes of the existing pipe 72 shown in FIG. The tip of 72b is cut as follows. (1) As shown in (A), the tip of the vertical streak 8 is about to be bent in the direction M of rotation of the cutter head 10c.
The convex conical cutter head face plate 17 is forcibly pushed outward in the radial direction and is bent outward by φ1 from a tangential direction to the rotation of the cutter head 10c. (2) The longitudinal streaks 8 bent in this manner are reliably cut by the gear-shaped roller cutter 14 rotating later.

The configuration of the fifth embodiment of the present invention will be described with reference to FIGS. As shown in (D), the cutter head 10d of the present embodiment includes a cutter head face plate 18 having a concave conical shape in the excavation direction, and the concave conical cutter head face plate 18 functions as a vertical streak bending means. I do.
Therefore, U-shaped vertical streak bending means 15, as shown in FIG.
There is no need to separately install a vertical bending means such as fifteen. In addition, the same parts as those in the fourth embodiment shown in FIGS. 8A and 8B are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 8 shows the operation of the fifth embodiment having the above configuration.
This will be described with reference to (C) and (D). As shown in (C),
The distal end of the longitudinal streak 8 is about to be bent in the direction M of rotation of the cutter head 10d, but is forced inwardly in the radial direction by the concave conical cutter head face plate 18 to prevent the cutter head 10c from rotating. It is bent inward by φ2 from the tangential direction. (2) The longitudinal streaks 8 bent in this manner are reliably cut by the gear-shaped roller cutter 14 rotating later. The cutter head face plates 17 and 1 shown in FIG.
8, the bending direction of the vertical stripes 8 can be more accurately regulated by installing the vertical stripe bending means 15, 15 similar to FIG. 6. As described above, the crushing of the existing pipes 5a and 72 has been described in the first to fifth embodiments. However, the present invention is not limited to this, and the operation and effect of a general existing structure are the same, and thus the description is omitted. I do.

[Brief description of the drawings]

FIG. 1 is an overall view showing a small-diameter pipe propulsion method using a small-diameter pipe propulsion machine having a cutter head of a tunnel machine according to the present invention.

FIG. 2 is a detailed view of an existing pipe with a hoop bar.

FIGS. 3A and 3B are views showing a first embodiment of the cutter head according to the present invention, wherein FIG. 3A is a front view and FIG. 3B is a longitudinal sectional view of FIG.

4A and 4B are diagrams showing a cutting action of a vertical streak by the notch-type roller cutter of FIG. 3, wherein FIG. 4A shows a first state, and FIG.
FIG. 4 is a diagram showing a second state.

5A and 5B are diagrams showing a cutting action of a vertical streak and a hoop streak by the notch type roller cutter of FIG. 3, wherein FIG. 5A is a diagram showing a first state, and FIG. 5B is a diagram showing a second state. .

6A and 6B are diagrams showing a second embodiment of the cutter head according to the present invention, wherein FIG. 6A is a front view, and FIGS.
A sectional view, (B) is a diagram showing a first state, (C) is a diagram showing a second state, (D) is a diagram showing a third state,
(E) is a diagram showing a fourth state.

FIGS. 7A and 7B are views showing a third embodiment of the cutter head according to the present invention, wherein FIG. 7A is a front view, and FIGS.
A sectional view, (B) is a diagram showing a first state, (C) is a diagram showing a second state, (D) is a diagram showing a third state,
(E) is a diagram showing a fourth state.

FIG. 8 shows a fourth embodiment and a fifth embodiment of the cutter head according to the present invention.
FIG. 14 is a view showing an embodiment, wherein (A) is a front view of the fourth embodiment,
(B) is a side view of the fourth embodiment, (C) is a front view of the fifth embodiment, and (D) is a side view of the fifth embodiment.

FIG. 9 is a diagram showing a first conventional technique.

FIG. 10 is a mounting view of the roller bit shown in FIG. 9, (A)
FIG. 3B is an installation diagram of a spiral roller bit, and FIG. 2B is an installation diagram of a horizontal blade roller bit.

11A and 11B are views showing an installation view of the roller bit shown in FIG. 9 and an existing pipe, wherein FIG.
(B) is a diagram showing an existing pipe.

12 is an explanatory view of the operation of the horizontal blade roller bit shown in FIG.

FIG. 13 is an explanatory diagram of an operation of the vertical blade roller bit shown in FIG. 11;

FIG. 14 is a diagram illustrating the operation of the spiral blade roller bit shown in FIG. 10;

FIG. 15 is a diagram showing a second conventional technique.

16 is a diagram showing a cross section taken along line AA of FIG.

FIG. 17 is a detailed view of a portion P in FIG. 16;

FIG. 18 is a diagram showing a third conventional technique.

[Explanation of symbols]

 Reference Signs List 1 starting shaft 2 reaching shaft 3 leading conduit 4 propulsion device 5,5a existing pipe 5b crushing surface 6 new pipe 7 hoop bar 8 vertical bar 81 first vertical bar 82 second vertical bar 9 concrete 10, 10a to 10d cutter head 11 screw Conveyor 12 Notch type roller cutter 121 1st notch 122 2nd notch 123 3rd notch 124 4th notch 12a Blade edge 12b Abdomen 13 Disk cutter 14 Gear type roller cutter 141 1st blade 142 2nd blade 15 15a Top plate 15b Side plate 16 Roller-shaped vertical streak bending means 17 Convex conical cutter head face plate 18 Concave conical cutter head face plate

Claims (14)

[Claims] 1. A cutter head of a tunnel excavator for excavating an excavated object including a vertical streak embedded in a tunnel excavating direction of a tunnel excavator, wherein a vertical streak projecting from an excavation surface of the excavated object is determined from a root thereof. A cutter head for a tunnel excavator, comprising a vertical streak bending means for forcibly bending in a direction. 2. A cutter head for a tunnel machine according to claim 1, further comprising a cutter provided with the vertical streak bending means. 3. The cutter head according to claim 2, wherein the cutter is a notch-type roller cutter having a notch-shaped blade. 4. The cutter head of a tunnel machine according to claim 1, further comprising a vertical streak bending means separate from a cutter installed on the cutter head. 5. The cutter head for a tunnel excavator according to claim 4, wherein said vertical streak bending means is a roller-shaped vertical streak bending means. 6. The cutter head of a tunnel machine according to claim 1, wherein said vertical streak bending means is a cutter head face plate. 7. The cutter head for a tunnel machine according to claim 6, wherein the face plate of the cutter head is convex in a direction in which the tunnel machine is excavated. 8. The cutter head of a tunnel machine according to claim 6, wherein the face plate of the cutter head is concave in a direction in which the tunnel machine excavates. 9. Excavation while crushing an excavated body including a vertical streak embedded in a tunneling machine in a direction of excavation, bending a vertical streak protruding from the crushed surface, and excavating a front pipe while cutting the same. A method for crushing an existing structure, comprising: forcibly bending the vertical streaks from a root thereof in a predetermined direction. 10. The method for crushing an existing structure according to claim 9, wherein a vertical streak of the existing structure is bent in a direction of a cut surface. 11. The method for crushing an existing structure according to claim 9, wherein a vertical streak of the existing structure is bent in a rotation direction of a cutter head. 12. The method for crushing an existing structure according to claim 9, wherein the bending is performed in a predetermined direction near a cut surface of the vertical streak. 13. The method for crushing an existing structure according to claim 9, wherein the existing structure is an existing pipe, and the inside of the existing pipe is filled with a filler and then crushed. Crushing method for existing structures. 14. The crushing method for an existing structure according to claim 9, wherein the existing structure is an existing pipe having a hoop streak, and a crushing surface and a hoop streak in the existing pipe are crushed when the existing pipe is crushed. A method for crushing an existing structure, comprising rotating a cutter head from an acute angle to an obtuse angle to crush an existing pipe.