JP2003336478A - Cutter plate for vertical shaft excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly carry out muck upward by collecting it on the rotation center part in the cutter plate through an excavation uptake opening part provided in the cutter plate, without releasing the muck excavated by the cutter plate to a working face side in a tunnel excavator excavating a vertical shaft. <P>SOLUTION: This cutter plate 1 is provided with a plurality of roller bits 6 for excavating a working face and the muck uptake opening part 4. This cutter plate is so constituted that a scraper 7 scraping the muck excavated by the cutter plate 2 toward a machine inside, and collecting them toward the rotation center is installed in a side edge facing in the rotation direction of the cutter plate in the excavation uptake opening part 4, and the excavation muck is collected by the scraper toward the rotation center of the cutter plate 1 and carried upward by an excavation carrier means such as a bucket conveyer having its upper end part to the rotation center part. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical shaft suitable for excavating a vertical vertical shaft to a predetermined depth when constructing an underground structure such as an oil storage or a radioactive waste storage in a deep underground layer. The present invention relates to the structure of a cutter plate in an excavator.

[0002]

2. Description of the Related Art Conventionally, as a means for excavating a vertical shaft to a predetermined depth, in the case of a small diameter vertical shaft, a bucket having an excavation bit attached to the tip has been used, and in the case of a large diameter vertical shaft, blasting is performed. Generally, it is difficult to excavate a vertical shaft having a predetermined diameter accurately and efficiently by any of the excavation means. Therefore, in recent years, a rock tunnel excavator (TBM) has been used. It is now being practiced to excavate a vertical shaft with the cutter plate of this tunnel excavator facing downward.

The above-mentioned tunnel excavator is widely used for excavating a horizontal shaft or an inclined shaft, and propels while rotating a cutter plate having a large number of roller bits mounted on the front surface thereof, and excavates by the cutter plate. Is carried out rearward by a carrying-out means such as a belt conveyor or a screw conveyor.

[0004]

However, when excavating a horizontal shaft or an inclined shaft by the tunnel excavator, the gap excavated by the cutter plate is removed from the tubular body of the tunnel excavator on the back side of the cutter plate. It is possible to drop out and accumulate in the slip intake chamber formed on the lower peripheral part of the front end, and carry out the scrap rearward by the carry-out means facing this slide intake chamber, but when excavating the vertical shaft, The cutter plate has the excavation surface with the roller bit facing downward and the back surface facing upward, so the earth and sand excavated by this cutter plate always stays on the face of the cutting face and remains on the cutter plate. It cannot be taken into the rear side of the cutter plate, that is, the inside of the machine above, through the provided gap taking-in opening.

Therefore, a scraper is provided on the side edge of the cutter take-in opening facing the rotational direction of the cutter plate, and the scraper is used to scrape the move upward through the slip take-in opening to the inside of the machine. But,
Even if the slip is once taken into the slip intake opening, if it is separated from the scraper, it will be naturally discharged downward through the slip intake opening, that is, to the face face side,
There was a problem that the slip could not be carried out smoothly from the inside of the machine to the upper side, and it was not suitable for use as a tunnel excavator for vertical shaft excavation.

The present invention has been made in view of the above problems, and an object of the present invention is to concentrate excavated excavated material such as scraps and earth and sand at the center of the lower end of the machine through the excavated material intake opening. (EN) A cutter plate for a vertical shaft excavator capable of smoothly and reliably carrying out excavated materials by gathering them together and enabling efficient vertical shaft excavation.

[0007]

In order to achieve the above object, a cutter plate of a shaft excavator according to the present invention is rotatably arranged at a lower end of a tubular body as described in claim 1 and is grounded. Is a cutter plate of a vertical shaft excavator that excavates in a direct downward direction, and a plurality of excavation material intake openings are provided at regular intervals in the circumferential direction, and a large number of them are provided on the lower surface of the cutter plate facing the face of the face. A roller bit is projectingly provided, and further, while the excavated material is scraped toward the center side from the outer peripheral end side of the cutter plate, to the side edge facing the rotational direction of the cutter plate in the excavated material intake opening. The structure is such that a scraper for scraping up is attached to the back side of the cutter plate through the opening for taking in the excavated material.

In the cutter plate of the shaft excavator constructed as described above, the invention according to claim 2 is adjacent to the plurality of spokes radially provided from the rotation center side to the outer peripheral end of the cutter plate. It consists of an excavation intake opening provided between the spokes and a plurality of roller bits protruding from the lower surface of the spoke facing the face of the face, facing the rotation direction of the cutter plate in each spoke. Side edge,
The cutter plate is inclined in the rotational direction of the cutter plate from the end on the center side of the cutter plate toward the end on the outer peripheral side, and the scraper is fixed to the edge of the inclined side and the cutting face of the scraper. It is characterized in that the excavated material is inclined in a direction of scraping it into the machine from the lower end edge facing the surface toward the upper end edge.

Further, the invention according to claim 3 is such that the excavated material excavated by a roller bit at the central portion of the lower surface of the cutter plate facing the face of the cutter is disposed outside the central portion of the lower surface to take in the excavated material. The invention according to claim 4 is characterized in that a scraping feed plate for feeding toward the opening is projected, and the invention according to claim 4 scrapes up through the excavation intake opening by a scraper on the upper surface of each of the spokes facing the inside of the machine. It has a structure in which a drilling material guide for guiding the drilled material thus drilled to the center of the upper surface of the cutter plate is provided.

Further, in the invention according to any one of claims 1 to 4, in the invention according to claim 5, the rotation center portion of the cutter plate is formed on a flat surface in the horizontal direction, and the center thereof is formed. Section is inclined upward toward the outer peripheral edge to form a recess for excavated material storage on the upper surface side of the central portion, and the excavated material disposed in the central portion of the tunnel excavator in the recessed material storage recess. It has a structure in which the lower end of the carry-out means is exposed.

[0011]

Operation: With the front surface of the cutter plate of the shaft excavator protruding from the roller bit facing downward, the shaft shaft is propelled vertically downward while rotating the cutter plate, so that the rock mass is raised. Devaluation will be continued. The excavated material such as scrap and earth and sand excavated by the roller bit is taken by the scraper through the excavated material intake opening onto the rear surface of the cutter plate facing upward at the lower end of the machine, and the cutter plate is rotated according to the rotation of the cutter plate. Is scraped from the outer peripheral end side toward the inner peripheral end and collected on the center of the back surface of the cutter plate.

As a structure for scraping the excavated material into the machine by such a scraper and scraping it from the outer peripheral end side of the cutter plate toward the inner peripheral end side, the excavated product taken in in the rotational direction of the cutter plate is taken in. The side edge of the opening is formed in a shape inclined from the inner peripheral edge side toward the outer peripheral edge in the rotation direction of the cutter plate, and the scraper is fixed along the inclined side edge and the scraper is attached. A structure in which the excavated material is inclined from the lower end edge facing the face to the upper end edge in the direction of scraping the excavated material into the machine is adopted, and by this structure, the excavated material is moved from the lower end edge side of the scraper toward the upper end edge side. The excavated material is scraped up from the excavated material intake opening toward the inside of the machine by the rotation of the cutter plate by the inclined surface that is inclined in the direction of scraping the scraper Remote it is moved ahead in the rotational direction of the cutter plate, toward the center of the cutter plate with scraped drilling product is capable to gather reliably and smoothly scrape off the drilling thereof.

On the other hand, in the central portion of the lower surface of the cutter plate where the excavation material intake opening is not provided, the excavated material excavated by the roller bit provided in the central portion is
The center of the rear surface of the cutter plate through the excavation intake opening along with the excavated material that is sent to the inner peripheral end side of the excavation intake opening by the scraping plate protruding from the lower surface of the center part and is scraped up and scraped by the scraper. It is sent to the department.

An excavated material storage recess is formed on the center of the rear surface of the cutter plate. After the excavated material is stored in the excavated material storage recess in a collective state, the lower end is exposed to the excavated material storage recess. It is carried out by the existing excavated material carrying-out means.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the drawings, a concrete embodiment of the present invention will be described. FIG. The body 11 is vertically arranged, and the cutter plate 1 is provided at the lower end opening thereof.
Is rotatably supported. As shown in FIGS. 2 and 3, the cutter plate 1 is provided with a plurality of spokes 3, 3, 3, ... Radially from the center of rotation 2 toward the outer peripheral edge at regular angular intervals in the circumferential direction. An excavation intake opening 4 communicating with the inside of the machine is formed between the adjacent spokes 3, 3 from the lower surface (front surface) facing the face A. The outer peripheral end faces of all the spokes 3 are integrally fixed to the ring member 5 forming the outer peripheral edge of the cutter plate 1 at regular intervals in the circumferential direction.

Roller bits 6 are rotatably mounted on the spokes 3 at regular intervals in the length direction, and the roller bits 5 are also mounted on the ring member 5 at the outer end mounting portions of the spokes 3. ing. As is well known, the roller bit 6 is formed into an abacus ball shape, the center of which is rotatably supported at a predetermined position of the spoke 3 or the ring member 5, and a part of the outer peripheral portion of the spoke 3 or the ring. The bedrock is cut with the lower surface of the member 5, that is, the lower surface (front surface) of the cutter plate 1 facing the face A, protruding downward. The roller bit 6 is pivotally supported by the spokes 3 and the ring member 5 so that the rotation direction thereof coincides with the rotation direction of the cutter plate 1.

Further, the side edge of the cutter plate in each of the excavation intake openings 4 facing the rotational direction of the cutter plate, that is, the side edge 3a of each spoke 3 facing the rotational direction of the cutter plate 1a.
In addition, while scraping excavated material such as sand and sand excavated by the cutter plate 1 (hereinafter, simply referred to as “sludge”) while scraping the cutter plate 1 from the outer peripheral end side toward the inner peripheral end side of the cutter plate 1, A scraper 7 for scraping up is attached to the rear side of the cutter plate, that is, the upper side facing the inside of the machine through the excavation material intake opening 4.

As described above, in order to construct the scraper 7 so as to scrape the excavation deviation from the outer peripheral end side toward the inner peripheral end side of the cutter plate 1 in accordance with the rotation of the cutter plate 1 into the machine, The side edges 3a of the spokes 3 facing the rotation direction of the cutter plate 1 are directed from the inner peripheral end of the cutter plate 1 which is continuous to the rotation center portion 2 to the outer peripheral end of the ring member 5. The cutter plate 1 in the rotating direction, and along the inclined side edge 3a, as shown in FIG.
The upper half of the scraper 7 formed in the rectangular plate shape in the width direction is fixed, and the scraper 7 extends from the lower end edge projecting toward the face A toward the upper end edge facing inward. The structure is inclined in a direction in which the slip is scraped into the machine, that is, in a direction opposite to the rotation direction of the cutter plate 1. The width of the scraper 7 protruding from the spokes 3 is substantially equal to the protruding size of the roller bit 6 from the spokes 3.

The scraper 7 has a narrow width formed by fixing a plurality of rectangular short pieces each having a constant thickness to the side end edges 3a of the spokes 3 in order while being connected in parallel with each other by an appropriate fixing tool such as a bolt. Is formed in the shape of a rectangular plate, and the long side edge portion (tip edge portion) on the lower end side projecting from the spoke 3 toward the face A is formed on the scraping blade 7a, and this sliding As described above, the scraper blade 7a is tilted toward the upper edge fixed to the side edge 3a of the spoke 3 in the counter-rotational direction of the cutter plate 1, and the scraper 7 excavates and slides as the cutter plate 1 rotates. It is configured to scrape up toward the inside of the aircraft.

In FIGS. 2 and 3, the side edges 3a of the spokes 3 to which the scraper 7 is fixed are rotated in the rotational direction of the cutter plate 1 with respect to an imaginary line Y in the radial direction passing through the center of the cutter plate 1. Although it is formed on the linear side edge 3a parallel to the imaginary line Y with a small interval in the opposite direction, the imaginary line Y in the radial direction passing through the center of the cutter plate 1 as shown in FIG. The outer peripheral edge of the side edge 3a is substantially aligned with the outer edge of the side edge 3a, and the linear side edge 3a is inclined from the virtual line Y in the direction opposite to the rotation direction of the cutter plate 1 toward the inner peripheral edge. You can leave it. Further, as shown by the chain double-dashed line in FIG. 5, it is formed on a curved side edge which is curved in a concave arc shape in the direction opposite to the rotation direction of the cutter plate 1 from the outer peripheral end to the inner peripheral end. In short, in short, the outer peripheral end side precedes the inner peripheral end side with respect to the rotation direction of the cutter plate 1 so that the excavation shift is scraped from the outer peripheral end side of the side edge 3a toward the inner peripheral end side. It should be formed in.

The rotation center portion 2 of the cutter plate 1 is formed in a flat plate shape whose upper and lower surfaces are flat in the horizontal direction, and a plurality of roller bits are formed on the lower surface of the rotation center portion 2. 6a is mounted, and the gap excavated by these roller bits 6a from the outer peripheral surface of the lower surface of the rotation center portion 2 to the inner peripheral end portion of the lower surface of the spokes 3 is covered with the inner peripheral end portion of the excavated object intake opening 4. An excavation scraping / feeding plate 8 is provided so as to be fed toward. This excavation scraping plate 8
Is curved in a gentle convex arc shape in the opposite direction to the rotation direction of the cutter plate 1 from the inner end on the rotation center 2 side to the outer end on the inner peripheral end side of the spoke 3. As described above, the scrap excavated by the roller bit 6a is fed toward the inner peripheral end of the excavated object intake opening 4.

On the other hand, on the upper surface of each of the spokes 3, that is, on the rear surface facing the inside of the machine, as shown in FIG. 3, the other side of the spoke 3 opposite to the side edge 3a on which the scraper 7 is mounted. An excavation guide 9 having a constant height is provided along the edge 3b so that the outer end of the excavation guide 9 faces the outer end of the side edge 3a to which the scraper 7 is attached. It is curved in an arc shape and crosses over the outer peripheral ends of the spokes 3 in the width direction, and its outer ends are in contact with the outer peripheral end faces of the scraper 7. Therefore, the scraper scraped up into the cutter plate 1 by the scraper 7 is prevented from falling again from the excavation material intake opening 4 to the face A side by the excavation material guide 9, and on the rear surface of the spoke 3 (on the upper surface). ) Are gathered toward the rotation center 2.

The spokes 3 constituting the cutter plate 1 may be provided so as to project horizontally from the center of rotation 2 toward the outer peripheral edge, but in the spokes 3 shown in FIG. The excavated material storage recess 10 is formed on the upper surface side (rear surface side) of the rotation center portion 2 in a shape gently inclined upward from the center portion 2 toward the outer peripheral end.

The tubular body 11 of the shaft excavator in which the cutter plate 1 is rotatably arranged at the lower end opening is composed of a lower body 11a and an upper body 11b which are flexibly connected to each other. A partition wall 12 is provided on the side body 11a, and a lower surface of the partition wall 12 is projected downward. An inner peripheral surface of a lower end portion of the fixed cylindrical wall body 13 is protruded from an outer peripheral end of the cutter plate 1 toward an inner peripheral surface thereof. The ring member 1b fixed to the inner ends of the plurality of arm members 1a
Is rotatably supported, and the rack 13 formed on the inner peripheral surface of the ring member 1b is engaged with the pinion 15 fixed to the rotation shaft of the drive motor 14 installed on the upper surface of the partition wall 12 for driving. The cutter plate 1 is rotated by the motor 14.

Further, at the center of the tubular body 11, an excavation material carrying-out means 16 composed of a bucket conveyor is vertically installed and arranged, and the lower end of the excavation material carrying-out means 16 is rotated by the cutter plate 1. The gap from the bucket, which is exposed in the excavation material storage recess 10 on the central portion 2 and has its upper end protruding upward from the central portion of the upper body 11b and being inverted at the upper end, is stored in the upper storage portion (not shown). ), And is discharged to the ground from this storage section by the following appropriate carrying-out means. As the excavated material carrying-out means 16 as described above, another carrying-out means such as a screw conveyor may be adopted in addition to the bucket conveyor.

The lower end of the lower body 11a and the upper body 11
b has a plurality of front grippers 17 and rear grippers 18 that support the shaft excavator by crimping to the excavation ground, and these grippers 17 and 18 are expanded and contracted in the inner and outer radial directions by hydraulic jacks, respectively. The upper body 11b has a plurality of propulsion jacks 19 at regular intervals on the inner peripheral surface of the upper body 11b.
Attach the rods of these propulsion jacks 19 to the upper fuselage
A structure is provided in which the lower end surface of a lining segment S, which is constructed on the inner peripheral surface of a vertical shaft T that is made to expand and contract upward from the upper end of 11b, is brought into contact with the segment S to support the propulsion reaction force. is doing.

Further, an intermediate partition wall 20 is stretched at an intermediate portion in the lengthwise direction of the upper body 11b, and the intermediate partition wall 20 and the partition wall 12 of the lower body 11a are connected by a plurality of adjusting jacks 21. By operating these adjusting jacks 21, the direction of the lower body 11a with respect to the upper body 11b in the digging direction can be adjusted. In the figure, 22 is the upper body 11b
Is an erector arranged on the upper end opening side.

In order to vertically dig down the vertical shaft T with the vertical shaft excavator constructed as described above, the front gripper is used.
At least one of 17 and the rear gripper 18 is slidably pressed against the excavation wall surface of the vertical shaft T to support the vertical shaft excavator so that it can be moved downward, and the cutter plate 1 is rotated by the drive motor 14 and already installed. The lining segment S that is present supports the propulsion reaction force of the propulsion jacks 19 and extends the rods of these propulsion jacks 19. The shaft excavator always acts in the direction of pressing the cutter plate 1 against the face A by its own weight, and the front gripper 17 and the rear gripper 18 prevent the shaft excavator from exerting all its own weight on the face A. Propulsion jack while supporting the shaft T
Since the propeller 19 is extended, the propulsion force of the propulsion jack 19 can be small.

When the shaft excavator is propelled vertically downward by the extension of the propulsion jack 19, the cutter plate 1 is cut face A.
While rotating while being pressed against, the rock face of the cutting face is cut down and excavated by the roller bits 6 attached to the plurality of spokes 3 radially protruding from the center of rotation 2. The scrap excavated by the roller bit 6 is passed through the excavation object intake opening 4 by the scraper 7 projecting from the side edge 3a of each spoke 3 forming the cutter plate 1, that is, the back surface side of the cutter plate 1, that is, While being scraped up to the upper surface side and being scraped from the outer peripheral end side of the spokes 3 toward the inner peripheral end side, the spokes 3 are sent to the back surface, that is, the upper surface of each spoke 3, and the scraper 7 of each spoke 3 is mounted. While preventing the scrap from falling again from the excavation material intake opening 4 to the face A side by the excavation material guide 9 protruding along the other side edge 3b opposite to the side edge 3a. Along the excavation material guide 9, the deviation is gathered together in the excavation material storage recess 10 on the center of rotation of the cutter plate 1.

On the other hand, the gap excavated by the plurality of roller bits 6a mounted on the lower surface of the rotation center portion 2 of the cutter plate 1 projects from the rotation center portion 2 to the inner peripheral end portion of the lower surface of the spoke 3. The excavated material scraping feed plate 8 is provided toward the inner peripheral end of the excavated material intake opening 4, and is scraped by the scraper 7 toward the storage recess 10 side together with the excavated material intake opening 4. Collected in the excavated material storage concave portion 10 from inside the inner peripheral end portion thereof.

In this way, the scraps gathered on the excavated material storage recess 10 are carried out upward while being scooped by the bucket or the like of the excavated material carrying-out means 16. Also, every time the cutter plate 1 excavates a vertical shaft portion of a predetermined depth while propelling the vertical shaft excavator, the segment S is assembled into a ring shape on the wall surface of the excavation by the erector 22 arranged on the upper body 11b side. Again, while supporting the propulsive reaction force of the propulsion jack 19 on the lower end surface of this segment S, the vertical shaft T is cut down by the vertical shaft excavator as described above, and the excavation gap is excavated by the scraper 7 of the cutter plate 1 as described above. The vertical shaft T is excavated up to a predetermined depth by gathering it in the storage recess 10 on the center of rotation and carrying it out upward by the excavation material carrying-out means 16 and repeating this work.

[0032]

As described above, according to the cutter plate of the shaft excavator of the present invention, as described in claim 1, it is rotatably arranged at the lower end of the tubular body and excavates the ground in the direction directly below. A cutter plate of a vertical shaft excavator, in which a plurality of excavation material intake openings are provided at regular intervals in the circumferential direction, and a large number of roller bits are projected on the lower surface facing the facet.
Furthermore, the rear side of the cutter plate through the excavation product intake opening while scraping the excavation product from the outer peripheral end side of the cutter plate toward the center side at the side edge facing the cutter rotation direction in the excavation product intake opening. Since the scraper that scrapes up is attached to the cutter plate, even though the cutter plate is facing vertically downward on the excavation surface, the excavation product excavated by the roller bit is scraped by the scraper through the excavation product intake opening on the cutter plate, In other words, it can be scraped up into the machine and scraped toward the center of the cutter plate,
It is possible to collect the excavated material on the central portion of the cutter plate without dropping it again from the excavated material intake opening to the face of the cutting face. Therefore, the excavated material can be smoothly and reliably carried out through the inside of the machine.

Further, according to the second aspect of the present invention, the cutter plate is provided with a plurality of spokes radially from the rotation center side toward the outer peripheral end, and a plurality of roller bits are provided on the lower surfaces of these spokes. The side edge of each spoke facing the direction of rotation of the cutter plate is formed by forming the excavation material intake opening between the spokes that are projecting and adjacent to each other, and the center of the cutter plate in the radial direction of the cutter plate. From the end on the side toward the end on the outer peripheral side in the direction of rotation of the cutter plate, and the upper half of the scraper is fixed to this inclined side edge and from the lower edge facing the face of the scraper. Since the excavated material is inclined toward the upper edge toward the inside of the machine, the scraper is inclined by the inclined surface of the scraper that is inclined from the lower edge toward the upper edge. As the plate rotates, the excavation product can be reliably scraped from the excavation product intake opening toward the inside of the machine, and the scraper is arranged so that its outer peripheral end side precedes the inner peripheral end side in the rotation direction of the cutter plate. To the center of the cutter plate while scraping up the excavated object.

Moreover, in the invention according to claim 1, in the invention according to claim 3, the excavation product excavated by the roller bit is formed in the central portion of the lower surface of the cutter plate facing the face of the face, and the central portion of the lower surface. Since the scraping feed plate that feeds toward the excavation material intake opening arranged further outward is projected, the center of the lower surface of the cutter plate where the excavation material intake opening is not provided also The excavated material excavated by the roller bit provided in the section can be fed into the excavated material intake opening by the scraping plate,
The scraper can be scraped up and stayed on the center of the rear surface of the cutter plate through the excavation material intake opening together with the excavated material.

Further, according to the invention of claim 4, in each of the spokes forming the cutter plate, the excavated material scraped up through the excavated material intake opening by the scraper on the upper surface facing the inside of the machine. Since the excavation guide that guides the to the center of the upper surface of the cutter plate is projected, this excavation guide can reliably prevent the excavation from falling again from the intake opening of the excavation to the face of the cutting face. In addition, it is possible to smoothly feed the excavated object toward the center of rotation of the cutter plate along the excavated object guide.

According to a fifth aspect of the present invention, the center portion of the cutter plate is formed to be a flat surface in the horizontal direction, and the spokes are inclined upward from the center portion toward the outer peripheral end of the cutter plate. Since the excavated material storage recess is formed on the upper surface side of the part, all the excavated material scraped up on the cutter plate through the excavated material intake opening by the scraper or the excavated material guide is temporarily stored in the excavated material storage recess. The excavated material can be efficiently discharged upward by the excavated material carrying-out means having the lower end facing the excavated material storage recess.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a vertical shaft excavator,

FIG. 2 is a front view of the cutter plate seen from below the shaft excavator,

FIG. 3 is a rear view of the cutter plate seen from above the shaft excavator,

FIG. 4 is a longitudinal sectional view of the spoke portion,

FIG. 5 is a simplified front view showing another structure of the cutter plate.

[Explanation of symbols]

1 cutter plate 2 rotation center 3 spokes 3a side edge 4 Excavation intake opening 6 Roller Bit 7 scraper 8 Excavation scraping plate 9 Excavation guide 10 Excavation storage recess 11 tubular body A face T vertical shaft

Continued front page    (72) Inventor Kenzo Mizuhara             2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka             No. Okumura Gumi Co., Ltd. (72) Inventor Junji Ono             2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka             No. Okumura Gumi Co., Ltd. (72) Inventor Naoki Inoue             2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka             No. Okumura Gumi Co., Ltd. (72) Inventor Minami Minoru             5 Yokaichi-cho, Komatsu City, Ishikawa Prefecture Small Co., Ltd.             Matsu Works Komatsu Factory (72) Inventor Toyoichi Nanbu             5 Yokaichi-cho, Komatsu City, Ishikawa Prefecture Small Co., Ltd.             Matsu Works Komatsu Factory (72) Inventor, Kouichi Morioka             5 Yokaichi-cho, Komatsu City, Ishikawa Prefecture Small Co., Ltd.             Matsu Works Komatsu Factory

Claims (5)

[Claims] 1. A cutter plate of a vertical shaft excavator which is rotatably arranged at a lower end of a tubular body and excavates the ground in a direction directly below, and a plurality of excavation material intake openings are circumferentially spaced at regular intervals. A large number of roller bits are provided on the lower surface facing the face of the cutting face, and further, the excavation material is cut at the side edge facing the rotational direction of the cutter plate in the excavation material intake opening. A cutter plate for a vertical shaft excavator, characterized in that a scraper is attached to the rear face side of the cutter plate through the excavation material intake opening while scraping the plate from the outer peripheral end side toward the center side. 2. The cutter plate is provided with a plurality of spokes radially from the rotation center side toward the outer peripheral end, and a plurality of roller bits are projected on the lower surface of these spokes, and between the adjacent spokes. The side edge of each spoke that faces the rotation direction of the cutter plate is formed with a slit for taking in the cutter, and the cutter plate is cut from the end toward the outer peripheral side in the radial direction of the cutter plate toward the end on the outer peripheral side. The scraper is tilted in the direction of rotation of the plate, and a scraper is fixed to the edge on the tilt side and tilted in the direction to scrape the excavated material into the machine from the lower end edge facing the face of the scraper toward the upper end edge. The cutter plate for a vertical shaft excavator according to claim 1, wherein the cutter plate is provided. 3. A scraping feed plate for feeding the excavated material excavated by a roller bit at the center of the lower surface of the cutter plate facing the face of the cutter, toward an excavated material intake opening arranged outside the center of the lower surface. 2. The cutter plate for a shaft excavator according to claim 1, wherein the cutter plate is provided so as to project. 4. An excavation material guide for guiding the excavation material scraped up by the scraper through the excavation material intake opening to the center of the upper surface of the cutter plate is provided on the upper surface of each spoke facing the inboard side. The cutter plate for a shaft excavator according to claim 1. 5. The cutter plate has a central portion formed in a flat surface in the horizontal direction, and the spokes are inclined upward from the central portion toward the outer peripheral end to the upper surface side of the central portion. The excavated material storage recess is formed, and the lower end of the excavated material discharge means arranged at the center of the tunnel excavator faces the excavated material storage recess. Of these, a cutter plate for a shaft excavator according to any one of claims.