JP2007239402A - Shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield machine forming a cutter frame provided in front of a shield body by separating it into a central cutter and an outer peripheral cutter and capable of ensuring the strength of the outer peripheral cutter sufficiently. <P>SOLUTION: In this shield machine forming the cutter frame 14 provided in front of the shield body 11 by separating it into the central cutter 15 and the outer peripheral cutter 16 surrounding the outer periphery of the central cutter 15, a first rotary shaft 25 and a second rotary shaft 30 surrounding the first rotary shaft 25 are rotatably supported on a bulkhead 12 provided in the vicinity of a front end part of the shield main body 11, and the outer peripheral cutter 16 is connected with the first rotary shaft 25 by a first beam 28 and is connected with the second rotary shaft 30 by a second beam 36. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shield machine in which a cutter frame provided in front of a shield body is separately formed into a central cutter and an outer cutter.

  In the shield machine, a tunnel is constructed by excavating a face with a cutter provided in front of the shield body and sequentially assembling segments behind the cutter. A plurality of cutter bits are arranged at the front end of the cutter, and the cutter blade is rotated and the face is excavated by the cutter bit.

  By the way, when the cutter frame of the cutter is a unitary object, particularly in a large-diameter shield machine, there is a great difference between the peripheral speed at the center of the cutter frame and the peripheral speed of the outer periphery. In particular, since the peripheral speed of the center portion of the cutter frame is slower than the peripheral speed of the outer peripheral portion, the excavation earth sand intake performance is not uniform in the radial direction of the cutter frame.

  Further, since the excavation distance of the cutter bit on the outer peripheral portion side is longer than the central portion side of the cutter frame, the degree of wear of the cutter bit at the central portion and the outer peripheral portion of the cutter frame becomes uneven.

  In order to solve such problems, a shield machine has been proposed in which a cutter frame provided in front of the shield body is formed separately into a central cutter and an outer cutter, and the central cutter and the outer cutter are independently driven to rotate. (Refer to patent document 1 etc.).

  For example, in the shield machine as described above, as shown in FIG. 4, the cutter frame 60 is separately formed into a disc-shaped central cutter 61 and a donut-shaped outer cutter 62 surrounding the outer periphery of the central cutter 61. Yes. Cutter bits 63 and 64 for excavating the face are provided at the front end portions of the central cutter 61 and the outer cutter 62, respectively.

  A central rotary shaft 66 is rotatably supported on the bulkhead 65. A central cutter 61 is connected to the front end portion of the central rotating shaft 66. The central rotating shaft 66 is provided with a drive motor (central cutter drive motor) 68 via a gear 67.

  In addition, a cylindrical outer peripheral rotation shaft 69 surrounding the central rotation shaft 66 is rotatably supported by the bulk head 65. The outer peripheral rotating shaft 69 is connected to the outer cutter 62 by an intermediate beam 70 extending rearward from the outer cutter 62 in the digging direction. A drive motor (peripheral cutter drive motor) 72 is provided on the outer peripheral rotation shaft 69 via a gear 71.

  When the central cutter driving motor 68 is driven, the rotational torque from the central cutter driving motor 68 is transmitted to the central cutter 61 via the central rotating shaft 66, and the central cutter 61 is rotationally driven. On the other hand, when the outer cutter driving motor 72 is driven, the rotational torque by the outer cutter driving motor 72 is transmitted to the outer cutter 62 via the outer peripheral rotating shaft 69 and the intermediate beam 70, and the outer cutter 62 is rotationally driven.

  As described above, the cutter frame 60 is separately formed into the central cutter 61 and the outer cutter 62, and the central cutter 61 and the outer cutter 62 are independently driven to rotate. Therefore, the rotational speed of the central cutter 61 is set to the outer cutter. By making it faster than the rotational speed of 62, the peripheral speed of the central cutter 61 and the peripheral speed of the outer cutter 62 can be made to substantially coincide.

Japanese Patent No. 2695801

  By the way, in the conventional shield machine shown in FIG. 4, since the outer cutter 62 is formed in a donut shape, a lack of strength occurs at the centering portion (see reference numeral 73 in FIG. 4) of the outer cutter 62, and the outer cutter There is a problem that it is difficult to ensure the strength of 62.

  Therefore, an object of the present invention is to provide a shield machine capable of sufficiently securing the strength of the outer cutter.

  To achieve the above object, the present invention provides a shield machine in which a cutter frame provided in front of a shield body is separately formed into a center cutter and an outer cutter surrounding the outer periphery of the center cutter. A bulk head provided in the vicinity of the part rotatably supports the first rotating shaft and the second rotating shaft surrounding the first rotating shaft, and the outer cutter is connected to the first rotating shaft by the first beam. In addition to being coupled, the second beam is coupled to the second rotating shaft by a second beam.

  Further, the present invention provides a shield machine in which a cutter frame provided in front of the shield body is separately formed into a central cutter and an outer cutter surrounding the outer periphery of the central cutter, provided near the front end of the shield body. A bulk head is rotatably supported by a central rotating shaft and an outer peripheral rotating shaft surrounding the central rotating shaft, and the outer cutter is connected to the central rotating shaft by a first beam and the outer periphery is connected by a second beam. It is connected to the rotating shaft.

  Here, a central cylinder is attached to the central rotational shaft, the central cutter rotational shaft is rotatably supported by the central cylindrical body, the central cutter is attached to a front end portion of the central cutter rotational shaft, and the central cutter is rotated. Driving means for rotationally driving the shaft may be provided in the central cylindrical body.

  In addition, a copy cutter is provided in the outer peripheral portion of the outer cutter so as to be able to protrude and retract, and fluid pressure for driving the copy cutter is supplied from the shield body side to the outer cutter side to the central rotating shaft. A rotary joint may be provided, and a supply pipe connecting the rotary joint and the copy cutter may be disposed through the first beam.

  According to the present invention, there is an excellent effect that the strength of the outer cutter can be sufficiently secured.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a front view of a shield machine according to a first embodiment of the present invention. FIG. 2 is a sectional side view of the shield machine according to the first embodiment of the present invention.

  As shown in FIGS. 1 and 2, the shield machine according to this embodiment includes a shield body 11 having a cutter 10 on the front side (left side in FIG. 2) in the digging direction. A plurality of erectors (not shown) for assembling the segments in the holes excavated by the cutter 10 and constructing a tunnel are provided at the rear part of the shield body 11 at a predetermined interval on the inner periphery of the shield body 11, A shield jack (not shown) for propelling the shield main body 11 by taking a reaction force on the segment is provided.

  A cutter chamber 13 is formed between the cutter 10 and a bulkhead (partition wall) 12 provided in the vicinity of the front end of the shield body 11 to take in the earth and sand (excavated earth and sand) excavated by the cutter 10.

  The cutter 10 has a cutter frame 14 that is rotationally driven with respect to the face. The cutter frame 14 is separately formed into a disc-shaped central cutter (cutter central portion) 15 and a donut-shaped outer cutter (cutter outer peripheral portion) 16 surrounding the outer periphery of the central cutter 15. In this embodiment, the center cutter 15 and the outer cutter 16 are formed in a face plate shape (see FIG. 1). The center cutter 15 and the outer cutter 16 may be formed in a spoke shape.

  A plurality of cutter bits 17 and 18 for excavating the face are provided at the front end portions of the central cutter 15 and the outer cutter 16, respectively.

  The center cutter 15 and the outer cutter 16 are respectively provided with slits 19 and 20 for taking earth and sand excavated by the cutter bits 17 and 18 into the cutter chamber 13 (see FIG. 1).

  At the rear ends of the central cutter 15 and the outer cutter 16, stirring blades 21 and 22 are provided for stirring the excavated earth and sand taken into the cutter chamber 13, respectively.

  A copy cutter 23 is provided at the outer peripheral portion of the outer cutter 16 so as to be able to protrude and retract in the radial direction of the outer cutter 16.

  A central rotating shaft (first rotating shaft) 25 is rotatably supported by a cylindrical housing 24 provided in the bulkhead 12. A seal mechanism 26 is provided between the central rotary shaft 25 and the bulkhead 12 (housing 24) to prevent the excavated earth and sand from entering the shield body 11. The central rotating shaft 25 receives hydraulic pressure working fluid (hydraulic hydraulic fluid in this embodiment) for driving the copy cutter 23 and a second drive motor 41 described later from the shield body 11 side to the outer cutter 16. A rotary joint 27 for supplying the side and inner peripheral cutter 15 is provided.

  The central rotary shaft 25 is connected to the outer cutter 16 by a central beam (first beam) 28 extending rearward in the digging direction from the outer cutter 16. The front end of the center beam 28 is connected to the inner periphery of the outer cutter 16. A plurality of central beams 28 are provided at predetermined intervals in the circumferential direction of the outer cutter 16 (see FIG. 1).

  A cylindrical outer peripheral rotation shaft (second rotation shaft) 30 surrounding the central rotation shaft 25 is rotatably supported by a cylindrical housing 29 provided in the bulkhead 12. The outer peripheral rotating shaft 30 is supported by the bulkhead 12 via bearings 31 and 32. Between the outer peripheral rotating shaft 30 and the bulkhead 12 (housing 29), a seal mechanism 33 for preventing the excavation earth and sand from entering the shield body 11 is provided. The outer peripheral rotary shaft 30 is provided with a plurality of drive motors (first drive motors) 35 (in this embodiment, electric motors) as drive means for rotationally driving the outer peripheral rotary shaft 30 via the gear 34. ing. The first drive motor 35 is attached to the bulkhead 12.

  The outer peripheral rotating shaft 30 is connected to the outer cutter 16 by an intermediate beam (second beam) 36 that extends rearward in the digging direction from the outer cutter 16 and is positioned at a substantially intermediate portion in the radial direction of the outer cutter 16. The intermediate beam 36 has a front end connected to a portion on the outer peripheral side of the inner peripheral portion of the outer cutter 16. A plurality of intermediate beams 36 are provided at predetermined intervals in the circumferential direction of the outer cutter 16.

  A cylindrical central cylinder 37 is attached to the front end of the central rotating shaft 25. A central cutter rotating shaft 39 is rotatably supported by a cylindrical housing 38 provided in the central cylindrical body 37. The central cutter rotating shaft 39 is supported by the central cylinder 37 via a bearing (not shown). Between the central cutter rotating shaft 39 and the central cylinder 37 (housing 38), a seal mechanism (not shown) for preventing the excavation earth and sand from entering the central cylinder 37 is provided.

  The central cutter 15 is connected to the front end portion of the central cutter rotating shaft 39.

  The central cutter rotation shaft 39 has a plurality of drive motors (second drive motors) 41 (hydraulic motors in the present embodiment) as drive means for rotationally driving the central cutter rotation shaft 39 via the gear 40. Is provided. The second drive motor 41 is attached to the central cylinder 37 (on the outer cutter 16 side).

  When the first drive motor 35 is driven, rotational torque from the first drive motor 35 is transmitted to the outer cutter 16 via the outer peripheral rotating shaft 30 and the intermediate beam 36, and the outer cutter 16 is rotationally driven. At the same time, the rotational torque of the first drive motor 35 is transmitted to the central cutter 15 via the outer cutter 16, the central beam 28, the central cylinder 37 (central rotational shaft 25) and the central cutter rotational shaft 39, and the central cutter 15 rotates. Driven.

  On the other hand, when the second drive motor 41 is driven, the rotational torque generated by the second drive motor 41 is transmitted to the central cutter 15 via the central cutter rotating shaft 39, and the central cutter 15 is moved on the central cylindrical body 37 (the outer cutter 16). Driven by rotation.

  Here, in this embodiment, the bulkhead 12 of the shield body 11 is rotatably supported by the central rotary shaft (first rotary shaft) 25 and the outer peripheral rotary shaft (second rotary shaft) 30, and the outer cutter 16 is Since the central beam (first beam) 28 is connected to the central rotary shaft 25 and the intermediate beam (second beam) 36 is connected to the outer peripheral rotary shaft 30, the inner peripheral portion of the outer cutter 16 is connected to the central beam 28 by the central beam 28. It is possible to support the portion on the outer peripheral side with respect to the inner peripheral portion by the intermediate beam 36, and the strength of the outer peripheral cutter 16 can be sufficiently ensured.

  Further, since the excavated sediment can flow between the plurality of central beams 28 adjacent to each other in the circumferential direction of the outer cutter 16 and between the plurality of intermediate beams 36, the excavated sediment in the cutter chamber 13 is caused by the central beams 28 and the intermediate beams 36. Therefore, the cutter chamber 13 can be prevented from being blocked.

  In the present embodiment, the central cutter rotating shaft 39 is rotatably supported by the central cylinder 37 attached to the central rotating shaft 25, and the central cutter 15 is attached to the front end portion of the central cutter rotating shaft 39, By attaching a second drive motor (driving means) 41 for rotationally driving the cutter rotating shaft 39 to the central cylinder 37, the central cutter 15 is rotatably provided on the central cylinder 37 (the outer cutter 16). .

  Therefore, the central cutter 15 is rotated in the same rotational direction as the outer cutter 16 by the second drive motor 41 while the central cutter 15 and the outer cutter 16 are rotationally driven by the first drive motor 35. The rotational speed of the cutter 15 can be made faster than the rotational speed of the outer cutter 16. Therefore, the peripheral speed of the central cutter 15 can be made faster than the peripheral speed of the outer cutter 16 with a small amount of working fluid (hydraulic oil), and the second drive motor 41 is compared with the central cutter drive motor 68 shown in FIG. And can be downsized.

  By the way, in the conventional shield machine shown in FIG. 4, a supply pipe (see reference numeral 75 in FIG. 4) for supplying a working fluid for fluid pressure to the copy cutter (see reference numeral 74 in FIG. 4) is provided. For example, an apparatus having a special mechanism described in Japanese Patent Application Laid-Open No. 2002-357085 is required. In this embodiment, as shown in FIG. 2, the supply pipe 42 is disposed from the shield body 11 side to the outer cutter 16 side through the central beam 28, and the copy cutter 23 and the rotary joint 27 are connected by the supply pipe 42. To connect. Therefore, according to the present embodiment, the supply pipe 42 of the copy cutter 23 can be easily arranged using the normal rotary joint 27 without using the device having the special mechanism as described above.

  Next, a second embodiment will be described.

  FIG. 3 is a side sectional view of the shield machine according to the second embodiment of the present invention. The same members as those in FIGS. 1 and 2 are denoted by the same reference numerals, description thereof will be omitted, and only differences will be described.

  As shown in FIG. 3, a cylindrical central cylindrical body 51 is attached to the inner periphery of the central rotating shaft 50. A central cutter rotating shaft 53 is rotatably supported by a cylindrical housing 52 provided in the central cylinder 51. The central cutter rotating shaft 53 is supported by the central cylinder 51 via a bearing (not shown). Between the central cutter rotating shaft 53 and the central cylinder 51 (housing 52), a seal mechanism (not shown) for preventing the excavated earth and sand from entering the central cylinder 51 is provided.

  The central cutter 15 is connected to the front end portion of the central cutter rotating shaft 53.

  In this embodiment, the central cutter rotating shaft 53 has a rear end portion extending rearward in the digging direction from the bulkhead 12. A plurality of drive motors (second drive motors) 55 (in this embodiment, as drive means for rotationally driving the central cutter rotary shaft 53 via a gear 54 are provided at the rear end of the central cutter rotary shaft 53. A hydraulic motor). The second drive motor 55 is attached to the central cylinder 51.

  In this embodiment, the gear 54, the second drive motor 55, and the like are arranged behind the bulk head 12 in the digging direction (that is, in the shield body 11). Therefore, as shown in FIG. 2, compared with the case where the gear 40, the second drive motor 41, and the like are disposed in front of the bulkhead 12 in the digging direction (that is, in the central cylindrical body 37 located in the cutter chamber 13), The central cylinder 51 and the like located in the cutter chamber 13 can be downsized.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various other embodiments can be adopted.

  For example, in the above-described embodiment, the second beam 36 is an intermediate beam positioned at a substantially intermediate portion in the radial direction of the outer cutter 16, but is not limited thereto. For example, the second beam 36 may be an inner peripheral beam positioned radially inward of the radially intermediate portion of the outer cutter 16, or positioned radially outward of the radially intermediate portion of the outer cutter 16. An outer peripheral beam may be used.

  In the above embodiment, the second drive motors 41 and 55 are attached to the central cylinders 37 and 51, but the second drive motors 41 and 55 may be attached to the bulkhead 12.

  Moreover, in the said embodiment, although the 1st drive motor 35 was provided in the outer periphery rotating shaft 30, you may make it provide the 1st drive motor 35 in the center rotating shafts 25 and 50. FIG.

  Further, the central rotary shafts 25 and 50 may be supported by the bulkhead 12 (housing 24) via bearings so that the load is shared between the central rotary shafts 25 and 50 and the outer peripheral rotary shaft 30. .

It is a front view of the shield machine according to the first embodiment. It is a sectional side view of the shield machine according to the first embodiment. It is a sectional side view of the shield machine according to the second embodiment. It is a sectional side view of the conventional shield machine.

Explanation of symbols

11 Shield body 12 Bulkhead 14 Cutter frame 15 Center cutter (Cutter center)
16 Outer cutter (cutter outer periphery)
23 Copy cutter 25 Central rotation axis (first rotation axis)
27 Rotary joint 28 Center beam (first beam)
30 Peripheral rotary shaft (second rotary shaft)
36 Intermediate beam (second beam)
37 central cylinder 39 central cutter rotating shaft 41 drive motor (second drive motor, drive means)
42 Supply pipe 50 Central rotating shaft 51 Central cylinder 53 Central cutter rotating shaft 55 Drive motor (second drive motor, drive means)

Claims (4)

In the shield machine, the cutter frame provided in front of the shield body is separately formed into a central cutter and an outer cutter surrounding the outer periphery of the central cutter.
A bulk head provided in the vicinity of the front end of the shield main body rotatably supports the first rotating shaft and the second rotating shaft surrounding the first rotating shaft, and the outer cutter is moved by the first beam. A shield machine that is connected to the first rotary shaft and connected to the second rotary shaft by a second beam. In the shield machine, the cutter frame provided in front of the shield body is separately formed into a central cutter and an outer cutter surrounding the outer periphery of the central cutter.
A bulk head provided in the vicinity of the front end of the shield body rotatably supports a central rotary shaft and an outer peripheral rotary shaft surrounding the central rotary shaft, and the outer cutter is connected to the central rotary shaft by a first beam. And a shield digging machine characterized by being connected to the outer peripheral rotation shaft by a second beam.   A central cylinder is attached to the central rotating shaft, the central cutter is rotatably supported by the central cylindrical body, the central cutter is attached to the front end of the central cutter rotating shaft, and the central cutter rotating shaft is rotated. The shield machine according to claim 2, wherein driving means for driving is provided in the central cylindrical body.   A rotary joint for providing a copy cutter in the outer peripheral portion of the outer cutter so that the copy cutter can be moved in and out, and supplying fluid pressure for driving the copy cutter from the shield body side to the outer cutter side on the central rotating shaft. The shield machine according to claim 2, wherein a supply pipe connecting the rotary joint and the copy cutter is disposed through the first beam.

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