JP2007126882A - Shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield machine capable of efficiently excavating a hole of horse's hoop shaped cross section. <P>SOLUTION: The shield machine for excavating the hole of horse's hoop shaped cross section comprises a rotary cutter 3 provided at a front part of a shield body 2 and driven to rotate around a shaft parallel with an excavating direction; support frames 10 provided at the front part of the shield body 2; and longitudinal shaft cutters 4 driven to rotate around shafts inclined with respect to the rotating shaft of the rotary cutter 3. In this case, the rotary cutter 3 is disposed almost at the center of the hole of horse's hoop shaped cross section, and the longitudinal shaft cutters 4 are arranged in unexcavated areas on both sides of the rotary cutter 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shield machine for excavating a horseshoe-shaped hole.

  In the shield machine, a tunnel is constructed by excavating a natural ground with a cutter provided at the front of the shield body and sequentially assembling segments behind it. A plurality of bits are arranged at the front end of the cutter, and the ground is excavated by the bits by rotating the cutter.

  Patent Document 1 discloses a shield machine for excavating a hole with a variable cross-sectional shape, in which a plurality of main cutters rotating around an axis parallel to the excavation direction are arranged in parallel, and between the main cutters, A shield machine with a trimming cutter for excavating linearly in the juxtaposed direction is described.

Japanese Patent Laid-Open No. 9-209693

  By the way, conventionally, as a shield machine for constructing a road tunnel, a machine for excavating a hole having a circular cross section has been used. On the other hand, in a road tunnel, there are cases where an emergency parking zone is provided for each predetermined distance on the side of the main road, or a multi-lane main road is provided.

  In such a case, in a shield machine that excavates a hole with a circular cross section, in order to secure the length in the width direction, a circular hole with a large cross section must be excavated, which is useless in the vertical direction. There was a space. Moreover, when constructing a road tunnel that is wider in the width direction than in the vertical direction, it is desirable that the hole to be excavated has a cross-section horseshoe shape from the viewpoint of the effective cross section and the balance of receiving earth load.

  Then, the objective of this invention is providing the shield machine which can excavate the hole of a cross-section horseshoe shape efficiently.

  In order to achieve the above object, the present invention is a shield machine for excavating a horseshoe-shaped hole, and is provided at the front part of the shield body and is driven to rotate around an axis parallel to the drilling direction. A cutter, a support frame provided at the front part of the shield body, and a vertical axis cutter provided on the support frame and driven to rotate about an axis inclined with respect to the rotation axis of the rotary cutter; The rotating cutter is arranged in the approximate center of the hole having a horseshoe shape in cross section, and the vertical cutter is arranged in unexcavated regions on both sides of the rotating cutter.

  Here, an auxiliary cutter is provided at the front portion of the support frame so as to be rotatable about an axis inclined with respect to the rotation axis of the vertical cutter, and the rotation axis of the vertical cutter and the rotation axis of the auxiliary cutter are In addition, the bevel gears may be mounted so as to be engaged with each other.

  A plurality of the auxiliary cutters may be arranged at a predetermined interval in the rotation direction of the vertical axis cutter.

  According to the present invention, the following excellent effects can be obtained.

  (1) According to the first aspect of the present invention, the rotary cutter is disposed at the approximate center of the cross-section horseshoe-shaped hole, and the vertical axis cutter is disposed in the unexcavated regions on both sides of the rotary cutter. A hole having a shape can be excavated efficiently.

  (2) According to the invention of claim 2, since the auxiliary cutter is provided at the front portion of the support frame that supports the vertical cutter, the auxiliary cutter can eliminate an unexcavated portion by the vertical cutter.

  (3) According to the invention of claim 2, since the vertical cutter and the auxiliary cutter are interlocked by the bevel gear, the power of the auxiliary cutter can be taken from the power source of the vertical cutter. No new power source is required.

  (4) According to the invention of claim 3, since a plurality of auxiliary cutters are arranged at a predetermined interval in the rotation direction of the vertical cutter, the size of the auxiliary cutter is not increased, and the size of the auxiliary cutter is not increased. The excavation part can be eliminated.

  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 an embodiment of the present invention. FIG. 2 is a side view of the vertical cutter and the auxiliary cutter. 3 is a cross-sectional view taken along line III-III in FIG.

  As shown in FIG. 1, the shield machine 1 according to the present embodiment includes a shield body 2 and a rotary cutter 3 that is provided at the front portion of the shield body 2 and is driven to rotate about an axis parallel to the digging direction. ing. The shield body 2 of this embodiment has a horseshoe shape that is wider in the lateral width direction (left-right direction in FIG. 1) than in the vertical direction (up-down direction in FIG. 1), and is lower than the center in the vertical direction. The width is formed to be the widest.

  At the rear of the shield body 2, an erector (not shown) for assembling a segment in a hole excavated by a rotary cutter 3, a longitudinal cutter 4 and an auxiliary cutter 5 described later, and constructing a tunnel (road tunnel), A plurality of shield jacks (not shown) are provided on the inner periphery of the shield body 2 at a predetermined interval, and a reaction force is applied to the segments to propel the shield body 2.

  The rotary cutter 3 of this embodiment has a cutter frame 6 that extends radially outward from the center of rotation and is rotated about an axis parallel to the excavation direction. The cutter frame 6 is rotatably supported by a bulkhead 7 provided at the front portion of the shield body 2 and is rotated by a drive motor (not shown) provided in the shield body 2. A plurality of bits (not shown) are attached to the front end of the cutter frame 6. In the present embodiment, the cutter frame 6 is formed in a spoke shape. The cutter frame 6 may be formed in a face plate shape.

  Between the cutter frame 6 and the bulkhead 7, a chamber (see reference numeral 8 in FIG. 2) for taking earth and sand (excavated earth and sand) excavated by the rotary cutter 3, the vertical axis cutter 4 and the auxiliary cutter 5 is formed. A screw conveyor 9 that passes through the bulkhead 7 and opens to the chamber 8 is provided below the bulkhead 7.

  As shown in FIGS. 2 and 3, the shield machine 1 according to the present embodiment includes a support frame 10 provided at the front portion of the shield body 2, and a support frame 10, and a cutter frame 6 of the rotary cutter 3. And a vertical axis cutter 4 that is driven to rotate about an axis inclined with respect to the rotation axis. The vertical axis cutter 4 of this embodiment is driven to rotate about an axis substantially orthogonal to the rotation axis of the cutter frame 6 of the rotary cutter 3. Further, in the present embodiment, the vertical axis cutter 4 is arranged behind the cutter frame 6 of the rotary cutter 3 (see FIG. 2).

  As shown in FIG. 3, the vertical axis cutter 4 of the present embodiment has a rotary shaft 11 provided so as to be rotatable about an axis substantially orthogonal to the rotary axis of the cutter frame 6 of the rotary cutter 3. . The rotating shaft 11 is supported by the support frame 10 via bearings 12, 13, and 14 and is rotated by a drive motor 15 provided on the support frame 10.

  In the present embodiment, two support frames 10 are provided at predetermined intervals in the axial direction of the rotating shaft 11 (see FIG. 1).

  In this embodiment, pinions 17 and 18 are mounted on the rotation shaft 11 of the vertical cutter 4 and the rotation shaft 16 of the drive motor 15, respectively, and these pinions 17 and 18 are a plurality of gears 19, 20, 21. It is connected through. The gears 19 and 20 are attached to the rotating shaft 22, and the gear 21 is attached to the rotating shaft 23. The rotary shafts 22 and 23 are supported by the support frame 10 via bearings 24 and 25, respectively.

  The connection between the rotary shaft 11 of the vertical cutter 4 and the rotary shaft 16 of the drive motor 15 is not limited to a gear. For example, the pinion 17 of the rotating shaft 11 of the vertical axis cutter 4 and the pinion 18 of the rotating shaft 16 of the drive motor 15 may be connected by a chain or the like.

  A plurality of bits 26 are attached to the outer periphery of the rotating shaft 11 of the vertical cutter 4 at predetermined intervals in the axial direction and the circumferential direction (rotating direction).

  A substantially cylindrical holding member 27 is attached to the outer periphery of the rotary shaft 11 of the vertical cutter 4. In the present embodiment, the holding member 27 extends from the attachment portion toward the support frame 10 in the axial direction of the rotary shaft 11 of the vertical cutter 4 so as to cover a part of the support frame 10. A plurality of bits 28 are attached to the outer periphery of the holding member 27 at predetermined intervals in the axial direction and the circumferential direction (rotation direction).

  Here, in the present embodiment, the rotary cutter 3 is arranged in the approximate center of the cross-section horseshoe-shaped hole excavated by the cutters 3, 4, and the vertical axis cutter 4 is arranged in an unexcavated area on both sides of the rotary cutter 3. (See FIG. 1). In the present embodiment, two longitudinal cutters 4 are arranged in the unexcavated areas on both sides of the rotary cutter 3 with a predetermined interval in the vertical direction. Thus, by arranging the rotary cutter 3 and the vertical axis cutter 4 in combination, the cross-sectional shape of the hole excavated by the cutters 3 and 4 can be a horseshoe cross-section.

  By the way, in the area in front of the support frame 10, the support frame 10 becomes a hindrance to rotation, so the bits 26 and 28 of the vertical axis cutter 4 cannot be arranged. The vertical cutter 4 cannot excavate. Therefore, in this embodiment, in order to excavate the natural ground in the area in front of the support frame 10, the auxiliary cutter can be rotated around the axis inclined with respect to the rotation axis 11 of the vertical axis cutter 4 at the front portion of the support frame 10. 5 is provided. The auxiliary cutter 5 of the present embodiment is provided so as to be rotatable around an axis substantially orthogonal to the rotation axis 11 of the vertical axis cutter 4. In the present embodiment, the auxiliary cutter 5 is disposed behind the cutter frame 6 of the rotary cutter 3 (see FIG. 2).

  As shown in FIG. 3, the auxiliary cutter 5 of the present embodiment has a rotating shaft 29 that is rotatably provided about an axis that is substantially orthogonal to the rotating shaft 11 of the vertical axis cutter 4. The rotary shaft 29 is rotatably supported by the support frame 10 via a bearing 30 and is rotated by the drive motor 15.

  In the present embodiment, bevel gears 31 and 32 are mounted on the rotary shaft 11 of the vertical cutter 4 and the rotary shaft 29 of the auxiliary cutter 5 so as to mesh with each other. The rotating shaft 29 of the auxiliary cutter 5 is rotated by the bevel gears 31 and 32 as the rotating shaft 11 of the vertical cutter 4 rotates.

  A substantially umbrella-shaped holding member 33 is attached to the front portion of the rotating shaft 11 of the auxiliary cutter 4. A plurality of bits (not shown) are arranged at the front end of the holding member 33.

  Here, in the present embodiment, the auxiliary cutter 5 is placed in the circumferential direction of the rotary shaft 11 of the vertical cutter 4 at a location where the difference between the outer diameter of the cutter frame 6 of the rotary cutter 3 and the outer diameter of the shield body 2 is relatively large. A plurality of them are arranged at a predetermined interval in the (rotating direction). Specifically, in the present embodiment, two auxiliary cutters 5 are arranged at a location where the difference between the outer diameter of the cutter frame 6 of the rotary cutter 3 and the outer diameter of the shield body 2 is relatively large (FIG. 1). reference). Further, one auxiliary cutter 5 is arranged at a location where the above difference is relatively small.

  Next, the operation of this embodiment will be described.

  When excavating the face, if the rotary cutter 3 is driven to rotate by a drive motor (not shown), the natural ground is excavated into a circular cross section by the rotary cutter 3 to form a hole having a circular cross section.

  At the same time, when the vertical cutter 4 is driven to rotate by the drive motor 15, the ground in the unexcavated region on both sides of the circular hole formed by the rotary cutter 3 is excavated by the vertical cutter 4, A horseshoe-shaped hole that is continuous with the circular hole is formed.

  When the vertical cutter 4 is driven to rotate, the rotary shaft 29 of the auxiliary cutter 5 is rotated with the rotation of the rotary shaft 11 of the vertical cutter 4, and the auxiliary cutter 5 is driven to rotate. The auxiliary cutter 5 excavates a natural ground in a region in front of the support frame 10.

  In short, according to the present embodiment, the rotary cutter 3 that is driven to rotate about an axis parallel to the excavation direction is disposed at the approximate center of the horseshoe-shaped hole excavated by the cutters 3 and 4. Since the vertical cutter 4 that is driven to rotate about an axis inclined with respect to the rotary shaft is disposed in the unexcavated regions on both sides of the rotary cutter 3, it is possible to efficiently excavate a horseshoe-shaped hole in cross section. it can.

  According to the present embodiment, the auxiliary cutter 5 is provided at the front portion of the support frame 10 that supports the vertical cutter 4 so as to be rotatable about an axis inclined with respect to the rotary shaft 11 of the vertical cutter 4. The ground in the region in front of the support frame 10 that cannot be excavated by the vertical cutter 4 can be excavated by the auxiliary cutter 5, and the unexcavated portion by the vertical cutter 4 can be eliminated.

  Further, according to the present embodiment, the bevel gears 31 and 32 are respectively attached to the rotary shaft 11 of the vertical cutter 4 and the rotary shaft 29 of the auxiliary cutter 5 so as to be engaged with each other. Since the cutter 4 and the auxiliary cutter 5 are interlocked by the bevel gears 31 and 32, the power of the auxiliary cutter 5 can be taken from the power source (drive motor 15) of the vertical axis cutter 4. Power source is not required.

  Furthermore, according to the present embodiment, a plurality of auxiliary cutters 5 are arranged at predetermined intervals in the rotation direction of the vertical cutter 4, so that the outer diameter of the cutter frame 6 and the outer diameter of the shield body 2 of the rotary cutter 3 are arranged. Even when the difference between the vertical cutter 4 and the vertical cutter 4 is relatively large, an unexcavated portion by the vertical cutter 4 can be eliminated without increasing the size of the auxiliary cutter 5.

  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 vertical cutter 4 is driven to rotate around an axis substantially orthogonal to the rotational axis of the cutter frame 6 of the rotary cutter 3, but the vertical cutter 4 is the cutter frame 6 of the rotary cutter 3. The embodiment is not limited to the above embodiment as long as it is driven to rotate around an axis inclined with respect to the rotation axis.

  In the above embodiment, the auxiliary cutter 5 is provided so as to be rotatable about an axis substantially orthogonal to the rotation axis 11 of the vertical axis cutter 4. However, the auxiliary cutter 5 is provided with respect to the rotation axis 11 of the vertical axis cutter 4. As long as it is provided so as to be rotatable about an inclined axis, the above embodiment is not limited.

  Furthermore, the arrangement of the vertical cutter 4 is not limited to the above embodiment. A hole having a desired cross-sectional shape can be excavated by freely arranging the vertical cutter 4.

It is a front view of the shield machine which concerns on one Embodiment of this invention. It is a side view of a vertical axis cutter and an auxiliary cutter. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield machine 2 Shield main body 3 Rotating cutter 4 Vertical axis cutter 5 Auxiliary cutter 10 Support frame 11 Rotating shaft 29 Rotating shaft 31 Bevel gear 32 Bevel gear

Claims (3)

  A shield machine for excavating a horseshoe-shaped hole in cross section, provided at the front of the shield body, and rotated at an axis parallel to the direction of excavation, and provided at the front of the shield body And a longitudinal cutter provided on the support frame and driven to rotate about an axis inclined with respect to the rotational axis of the rotary cutter, the rotary cutter having a hole in the shape of a horseshoe in cross section A shield machine according to claim 1, wherein the vertical cutter is arranged in an unexcavated area on both sides of the rotary cutter.   An auxiliary cutter is provided at the front portion of the support frame so as to be rotatable around an axis inclined with respect to the rotation axis of the vertical axis cutter, and the rotation axis of the vertical axis cutter and the rotation axis of the auxiliary cutter are mutually connected. The shield machine according to claim 1, wherein bevel gears are respectively mounted so as to be engaged with each other.   The shield machine according to claim 2, wherein a plurality of the auxiliary cutters are arranged at a predetermined interval in the rotation direction of the longitudinal cutter.

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