JP4197921B2 - Cutter device and tunnel excavator provided with the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutter device for cutting an inner peripheral surface of a tunnel facing a back agent injection pipe and a tunnel excavator provided with the cutter device.
[0002]
[Prior art]
Conventionally, in shield machines, a simultaneous back-injection device is attached to the outer surface of the skin plate, and at the same time as tunnel excavation, a back-filling agent such as mortar is fed backward from the rear end of the injection pipe in the simultaneous back-injection device. There is known a technique in which a gap between the segment and the inner peripheral surface of the tunnel is filled with the ejected backing agent.
[0003]
When drilling hard ground such as rock or NOMST walls using this type of shield machine, the simultaneous back-injection device protrudes outward from the outer peripheral surface of the skin plate, and the simultaneous back-injection device is damaged. Therefore, there is a problem that this simultaneous back-injection device cannot be equipped.
[0004]
In order to deal with such problems, a through hole is formed at the front position of the simultaneous back-injection device in the main body of the excavator, and a movable cylinder is inserted into the through hole so as to be movable in the radial direction. There has been proposed one in which a cutting cutter is arranged in a cylinder and a portion facing the simultaneous back-injecting device is cut by the cutting cutter (see Patent Document 1). For the same purpose, an auxiliary bit having an axis inclined at a predetermined angle with respect to the axis of the skin plate is projected (see Patent Document 2).
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-291786 [Patent Document 2]
Japanese Patent Laid-Open No. 2000-104489
[Problems to be solved by the invention]
However, the apparatus described in Patent Document 1 is configured to move the moving cylinder in the radial direction by a plurality of jacks, and to move the cutting cutter in conjunction with the movement of the moving cylinder. In addition, the length of the apparatus in the longitudinal direction is not only very long, but also the size of the apparatus is increased as a whole, and the rear end of the drive motor jumps out into the machine. Similarly, also in the apparatus described in Patent Document 2, the rotary drive device that rotates the auxiliary bit protrudes greatly in the interior space of the machine, and when an extruded jack is attached, the apparatus configuration becomes larger, There is a problem of interference with other members.
[0007]
The present invention has been made to solve such problems, and a simultaneous back-injection apparatus is also used in a tunnel excavator for excavating a rock mass or a NOMST wall without using a jack and having an extremely compact structure. It is an object of the present invention to provide a cutter device that can be equipped and to provide a tunnel excavator including the cutter device.
[0008]
[Means for solving the problems and actions / effects]
In order to achieve the above object, the cutter device according to the first invention comprises:
(A) a drive motor;
(B) a rotary cutter that is mounted on the output shaft of the drive motor and has a cutting blade on the axial end surface and outer peripheral surface;
(C) a slide member having a substantially cylindrical outer peripheral surface including and supporting the drive motor;
(D) a holder provided on the outer peripheral portion of the slide member and supporting the slide member so as to be slidable in the axial direction; and (e) formed between the outer peripheral surface of the slide member and the inner peripheral surface of the holder. Hydraulic pressure supply means for supplying and discharging pressure oil into the chamber and sliding the slide member relative to the holder ;
The drive motor has a flange portion, a surface on the output shaft side of the drive motor in the flange portion is an attachment surface, and the slide member has a motor support portion that bolts the flange portion of the drive motor. The motor support part is provided with an opening through which the rotary cutter can pass .
The cutter device according to the second invention is
(A) a drive motor;
(B) a rotary cutter that is mounted on the output shaft of the drive motor and has a cutting blade on the axial end surface and outer peripheral surface;
(C) a slide member having a substantially cylindrical outer peripheral surface including and supporting the drive motor;
(D) a holder provided on an outer peripheral portion of the slide member, and supporting the slide member slidably in the axial direction;
(E) Hydraulic pressure supply means for supplying and discharging pressure oil into and out of a chamber formed between the outer peripheral surface of the slide member and the inner peripheral surface of the holder to slide the slide member relative to the holder
With
The drive motor has a flange portion, and a surface of the flange portion opposite to the output shaft of the drive motor is an attachment surface, and the slide member is a motor support portion that bolts the flange portion of the drive motor. The diameter of the rotary cutter is approximately the same as the diameter of the outer peripheral surface of the slide member.
[0009]
In the cutter device according to each of the above inventions, the hydraulic oil is supplied / discharged from the hydraulic pressure supply means into the chamber formed between the outer peripheral surface of the slide member and the inner peripheral surface of the holder, so that The slide member is slid in the axial direction, whereby the rotary cutter is taken in and out, and the natural ground is excavated by the cutting blades provided on the front end surface and the outer peripheral surface. Thus, by attaching the cutter device to the front position of the simultaneous back injection device in the tunnel excavator equipped with the simultaneous back injection device, the inner peripheral surface of the tunnel facing the simultaneous back injection device by the cutting blade. Even when excavating a hard wall such as a rock mass or a NOMST wall, it can be cut reliably. As a result, it is possible to reliably prevent the simultaneous back-injection apparatus from being damaged. According to each of the above inventions, the drive motor is housed in the apparatus and no jack is used, compared to the conventional structure in which the rotary cutter is put in and out using a jack, so that the apparatus configuration is extremely compact. And can be mounted in a direction perpendicular to the skin plate. In addition, there is no problem such as galling when the rotary cutter is put in and out, and it can be put in and out smoothly.
[0010]
In addition to the above-described effects, according to the first aspect of the present invention, the minimum unit including the drive motor and the rotary cutter can be attached and detached from the inside of the machine through the opening of the motor support portion, and the maintenance of the cutting blade of the rotary cutter can be performed. Can be improved.
[0011]
Further, according to the second invention, when the rotary cutter protrudes, it is possible to cut all the earth and sand that hinders sliding of the slide member with the rotary cutter. Can be prevented.
[0012]
Next, tunneling machine according to the third invention is characterized by comprising a cutting device of the first or second aspect of the invention. According to the present invention, it is possible to equip a tunnel excavator for propelling a hard wall portion such as a rock mass or a NOMST wall with a simultaneous back-injecting device, and the tunnel inner peripheral surface facing the simultaneous back-injecting device is It can cut reliably with the cutting blade with which the cutter apparatus was mounted | worn.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific embodiments of the cutter device according to the present invention and a tunnel excavator including the cutter device will be described with reference to the drawings.
[0014]
FIG. 1 shows a longitudinal sectional view of a shield machine equipped with a cutter device according to an embodiment of the present invention, FIG. 2 shows an enlarged view of part P of FIG. 1, and FIG. An exploded perspective view of the rotating cutter is shown.
[0015]
In the shield machine 1 of the present embodiment, a disc-shaped cutter head 3 is rotatably supported on the front portion of a straight body type skin plate 2, and the cutter head 3 is rotationally driven by driving of a cutter head motor 4. It is comprised so that. A chamber 6 for taking up earth and sand is defined behind the cutter head 3 and a partition wall 5, and a screw conveyor 7 for discharging soil is disposed in the lower portion of the chamber 6 so that a tip portion is opened. The earth and sand taken into the chamber 6 by the rotation of the cutter head 3 is carried out backward by the screw conveyor 7.
[0016]
A tail seal 8 made of a wire brush is attached to the rear end of the skin plate 2. Further, a ring girder 9 is fixed to the inner wall surface of the skin plate 2, and behind this ring girder 9 are an elevator for segment assembly and an overhanging deck as a work table for segment assembly (both not shown). Each) is provided. Further, the ring girder 9 is provided with flange portions of a plurality of shield jacks 10, and a spreader 10 a for abutting the front end surface of the segment 11 to obtain a propulsion reaction force at the front end portions of the shield jacks 10. It is mounted via a spherical joint.
[0017]
Further, two simultaneous back-injecting devices 12 are provided in parallel to each other on the latter half of the outer periphery of the skin plate 2 so as to protrude from the outer peripheral surface of the skin plate 2. The simultaneous backfill injection device 12 injects a backfilling agent into the ground of the upper outer periphery simultaneously with the excavation of the shield machine 1, and the mortar is directed rearward from the rear end opening of the built-in backfilling agent injection pipe. Such a back-filling agent is ejected, and the ejected back-filling agent is filled between the segment 11 and the inner peripheral surface of the tunnel.
[0018]
A through hole 13 is formed in the skin plate 2 at the outer peripheral portion of the excavator main body at a position in front of the simultaneous back injection device 12, and a cutter device 14 is mounted in the through hole 13. As shown in FIG. 2, the cutter device 14 includes a slide member 15 that supports a hydraulic motor (drive motor) 29 and a rotary cutter 30 to be described later, and a slide member 15 provided on an outer peripheral portion of the slide member 15. And a holder 16 that slidably supports in the axial direction. The slide member 15 has a substantially cylindrical outer peripheral surface, and has a plurality of receiving seats (motor support portions) 15a protruding toward the center at the upper part of the inner peripheral surface. On the other hand, the holder 16 is disposed so as to be in sliding contact with the outer peripheral surface of the slide member 15, and is fixed to the reinforcing frame 2 a of the skin plate 2 by a plurality of bolts 17 penetrating the holder 16. The members of the holder 16 are fixed to each other by a plurality of bolts 18.
[0019]
Spline teeth 19 are provided on the outer peripheral surface of the slide member 15, and the spline teeth 19 are fitted into grooves on the inner peripheral surface of the holder 16, so that the slide member 15 can be prevented from rotating with respect to the holder 16 with a small surface pressure. It is structured. In addition, two oil passages (not shown) are formed in the holder 16 so that each oil passage communicates with chambers 20 and 21 formed on the sliding surfaces of the slide member 15 and the holder 16, respectively. It is configured. Thus, when pressurized oil is supplied into the chamber 21 through the oil passage, the slide member 15 is slid in the direction of arrow A from the position shown in FIG. When oil is supplied, the slide member 15 is slid in the direction of arrow B with respect to the holder 16 to return to the position shown in FIG. A piston seal 22 and U packings 23 and 24 as oil seals and U packings 25 and 26 as dust seals are interposed on the sliding contact surface between the holder 16 and the slide member 15. Further, O-rings 27 and 28 are inserted between the members constituting the holder 16.
[0020]
A hydraulic motor 29 is disposed on the inner side of the slide member 15, and a rotary cutter 30 is fixed to an output shaft 29a of the hydraulic motor 29 by spline fitting. Here, the hydraulic motor 29 has a flange portion 31 at an upper portion thereof, and a surface on the output shaft 29 a side of the flange portion 31 is an attachment surface, and a receiving seat of the slide member 15 is formed at a peripheral portion of the flange portion 31. It is fixed to 15a with a bolt 32.
[0021]
As shown in FIG. 3, the rotary cutter 30 has a substantially cylindrical body 33 having spline teeth 33a on the inner peripheral surface and a large number of square cutting blades 33b on the outer peripheral surface, and a chevron on the upper surface. The cutting head 34 a and the head 34 having a square cutting blade 34 b on the peripheral surface are fastened to each other by four bolts 35, and are rotated by a hydraulic motor 29. The side natural ground is cut by the cutting blades 34b and 33b on the outer peripheral surface while the cutting blade 34a is inserted into the natural ground.
[0022]
In the present embodiment, the outer diameter of the rotary cutter 30, in other words, the outer diameter of the cutting blades 34 b and 33 b is formed slightly smaller than the opening 36 formed inside the receiving seat 15 a of the slide member 15. In this way, for example, when the rotary cutter 30 is repaired or replaced, after loosening the bolt 32 fixing the flange portion 31 to the seat 15a, the rotary cutter 30 can be easily removed to the inside of the machine through the opening 36. .
[0023]
Further, as shown in FIG. 1, a water feeding device 37 is arranged at the front position of the cutter device 14, and several fixed parts are provided between the cutter device 14 and the simultaneous back-injecting device 12. Bit 38 is arranged. Here, the water feeding device 37 ejects water from the nozzle portion toward the cutting portion of the rotary cutter 30 in order to assist the cutting of the natural ground by the rotary cutter 30. Further, the fixed bit 38 serves to prevent the simultaneous back-injecting device 12 from being damaged by cutting the inner peripheral surface of the tunnel as the shield machine 1 advances, like the cutter device 14. However, the fixed bit 38 is used alone when the ground is soft. In the case of hard ground, the cutter device 14 of the present embodiment mainly serves to cut the inner peripheral surface of the tunnel.
[0024]
Next, the operation of the cutter device 14 of the present embodiment will be described with reference to FIG.
[0025]
When digging a soft ground that is not likely to be damaged by the simultaneous back-filling injection device 12, if the pressure oil is supplied to the chamber 20 through the oil passage, the slide member 15 is contracted with respect to the holder 16. The tip of the rotary cutter 30 is at a position retracted inward from the outer peripheral surface of the skin plate 2 (solid line position in FIG. 2). In this state, as the shield machine 1 moves forward, the fixed bit 38 cuts the inner peripheral surface of the tunnel to prevent the simultaneous back-injecting device 12 from being damaged.
[0026]
When excavating a hard ground such as a rock or a NOMST wall, pressure oil is supplied into the chamber 21 through an oil passage by a hydraulic supply means (not shown). Then, the slide member 15 is moved forward with respect to the holder 16, and the rotary cutter 30 is protruded outward from the outer peripheral surface of the skin plate 2 by a predetermined amount (an amount equal to or greater than the thickness of the simultaneous back-injecting device 12) ( (See the two-dot chain line in FIG. 2). At the same time, by driving the hydraulic motor 29, the rotary cutter 30 is rotated around its axial center, and the cutting blades 34a on the outer peripheral surface are laterally moved by the cutting blades 34b and 33b on the outer peripheral surface while penetrating the cutting blade 34a on the ground. The ground is cut. During the cutting, water is sprayed from the nozzle portion of the water feeding device 37 toward the cutting portion of the rotary cutter 30. Thereby, even when digging hard ground, damage to the simultaneous back-injection device 12 can be prevented.
[0027]
Further, when it is necessary to repair or replace the rotary cutter 30, the bolt 32 fixing the flange portion 31 of the hydraulic motor 29 to the seat 15a is loosened, and then the rotary cutter 30 is moved to the inside of the machine through the opening 36. It is recommended that the rotating cutter 30 that has been removed, repaired, or new is mounted in the reverse order.
[0028]
FIG. 4 shows a cross-sectional view of a cutter device 14A according to another embodiment of the present invention.
[0029]
This embodiment is basically different from the previous embodiment except that the diameter of the rotary cutter 30A attached to the output shaft 29a of the hydraulic motor 29 is different and the mounting surface of the flange portion 31 of the hydraulic motor 29 is different. There is no place. Accordingly, the same reference numerals are given to the parts common to the previous embodiment, and the detailed description thereof is omitted.
[0030]
In the cutter device 14A of the present embodiment, the diameter of the rotary cutter 30A is made substantially the same as the diameter of the outer peripheral surface of the slide member 15, and the flange portion 31 of the hydraulic motor 29 is on the opposite side to the output shaft 29a. The mounting surface is attached to the receiving seat 15a. With such a structure, when the rotary cutter 30A protrudes, all of the earth and sand that hinders sliding of the slide member 15 can be cut by the rotary cutter 30A. Therefore, the slide member 15 slides due to clogging of the earth and sand. There is an advantage that the occurrence of defects can be prevented. Further, since the hydraulic motor 29 and the rotary cutter 30A are attached to the slide member 15 from the outside of the machine, there is also an advantage that it is advantageous in terms of strength as compared with the previous embodiment.
[0031]
In the cutter device 14A of the present embodiment, when removing the rotary cutter 30A, the bolt 17 fixing the holder 16 to the reinforcing frame 2a of the skin plate 2 is loosened, and the holder 16, the slide member 15, the hydraulic motor 29, and The rotary cutter 30A is removed as one unit inside the machine. For this reason, there is a disadvantage that the removal weight becomes larger than that of the previous embodiment.
[0032]
In each of the above-described embodiments, the cutter device provided at the front position of the simultaneous back-filling injection device 12 has been described. However, the cutter device of the present invention is also a cutter provided at, for example, a front position of the tail seal grease greasing pipe section. It can also be applied to devices.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a shield machine equipped with a cutter device according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion P in FIG.
FIG. 3 is an exploded perspective view of a rotary cutter.
FIG. 4 is a cross-sectional view of a cutter device according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield machine 2 Skin plate 3 Cutter head 12 Simultaneous back injection apparatus 14 and 14A Cutter apparatus 15 Slide member 15a Receiving seat (motor support part)
16 Holder 20, 21 Chamber 29 Hydraulic motor (drive motor)
29a Output shaft 30, 30A Rotating cutter 31 Flange
36 opening 37 water supply device 38 fixed bit

Claims (3)

(A) a drive motor;
(B) a rotary cutter that is mounted on the output shaft of the drive motor and has a cutting blade on the axial end surface and outer peripheral surface;
(C) a slide member having a substantially cylindrical outer peripheral surface including and supporting the drive motor;
(D) a holder provided on the outer peripheral portion of the slide member and supporting the slide member so as to be slidable in the axial direction; and (e) formed between the outer peripheral surface of the slide member and the inner peripheral surface of the holder. Hydraulic pressure supply means for supplying and discharging pressure oil into the chamber and sliding the slide member relative to the holder ;
The drive motor has a flange portion, a surface on the output shaft side of the drive motor in the flange portion is an attachment surface, and the slide member has a motor support portion that bolts the flange portion of the drive motor. The cutter device is characterized in that the motor support is provided with an opening through which the rotary cutter can pass . (A) a drive motor;
(B) a rotary cutter that is mounted on the output shaft of the drive motor and has a cutting blade on the axial end surface and outer peripheral surface;
(C) a slide member having a substantially cylindrical outer peripheral surface including and supporting the drive motor;
(D) a holder provided on an outer peripheral portion of the slide member, and supporting the slide member slidably in the axial direction;
(E) Hydraulic pressure supply means for supplying and discharging pressure oil into and out of a chamber formed between the outer peripheral surface of the slide member and the inner peripheral surface of the holder to slide the slide member relative to the holder
With
The drive motor has a flange portion, and a surface of the flange portion opposite to the output shaft of the drive motor is an attachment surface, and the slide member is a motor support portion that bolts the flange portion of the drive motor. the a, cutter and wherein the diameter of the rotary cutter is substantially the same diameter as the diameter of the outer circumferential surface of the slide member. Tunneling machine, characterized in that it comprises a cutting device according to claim 1 or 2.

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