JP4176001B2 - Shield machine - Google Patents

Description

  The present invention relates to a shield machine capable of excavating a tunnel having a substantially square cross section.

  Some shield machines use the operating principle of the triangle of the Ruro, and this shield machine has three arm-shaped cutters projecting radially at equal angles at the front end of the rotating shaft. There is one in which a cutter head formed is excavated and rotated to excavate a tunnel having a substantially square cross section (for example, see Patent Document 1).

  As shown in FIG. 6, this shield machine has bearing members (corresponding to 55 and 57 described later) on a rotary plate 53 that is rotatably provided on a partition wall 52 disposed at a front portion in the shield body 51. ), The rotary shaft portion 54a of the cutter head 54 is rotatably supported at a position d eccentric from the rotary shaft center c by a predetermined distance e, and the rotary shaft portion 54a is rotated by the rotation of the cutter head 54. It is intended to rotate (revolve) at a speed 3/4 times the direction (spinning).

Hereinafter, the rotation drive mechanism and support structure of the cutter head 54 will be briefly described.
The rotating shaft portion 54 a of the cutter head 54 is supported at the front portion thereof by the rotating plate body 53 via the bearing 55, and the rear portion is also supported by the rotating plate portion 56 via the bearing 57.

  A first ring-shaped external gear 61 is attached to the outer peripheral portion of the rear surface of the rotary plate 53, and the shield main body 51 side is provided on the outer periphery of the rotary shaft portion 54a between the rotary plate 53 and the rotary plate 56. A second ring-shaped external gear 63 that meshes with a ring-shaped internal gear 62 fixed to is attached.

When the rotating plate 53 is rotated (revolved) in a predetermined direction by the electric motor 64 via the first ring-shaped external gear 61, the rotation is performed via the ring-shaped internal gear 62 and the second ring-shaped external gear 63. The shaft portion 54a is rotated (rotated) in the direction opposite to the revolution direction, and a tunnel having a substantially square cross section is excavated.
Japanese Patent Laid-Open No. 11-256991

  According to the configuration of the shield machine, the rotary shaft portion 54a of the cutter head 54 is supported by the front and rear portions via the bearings 55 and 57, respectively, and the intermediate position between the support portions by the both bearings 55 and 57 is supported. Since the second ring-shaped external gear 63 for rotation is attached, the rotating shaft portion 54a is inevitably long, and naturally the overall length of the shield body 51 is also long. Therefore, there is a problem that the curve performance at the time of curve construction is lowered and the control performance is also lowered due to an increase in weight.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a shield machine capable of reducing the size and weight of a shield main body in a tunnel excavating a substantially square cross section by using the operating principle of a triangular triangle. .

In order to solve the above-described problems, the shield machine of the present invention provides a rotating plate body rotatably provided at the front portion of the shield body, at a position eccentric to the rotation axis, and at the front end of the rotating shaft portion. The three arm-shaped cutter parts project at the same angle to support the cutter head rotatably, and the rotary plate body is connected to the outer periphery of the first ring-shaped external gear attached to the vicinity thereof. When the rotary drive is rotated in a predetermined direction, the cutter head is rotated at a speed of 4/3 times in the reverse direction via an interlocking mechanism, and a substantially square tunnel is excavated by the arm-shaped cutter unit. A shield machine that
The interlocking mechanism is attached via a mounting member to a ring-shaped internal gear supported on the shield body side so as to have the same axis as the first ring-shaped external gear, and to the rear portion of the rotary shaft portion of the cutter head. And a second ring-shaped external gear meshing with the ring-shaped internal gear.
Further, the second ring-shaped external gear is supported on the rotating plate body side via a bearing member.

  According to the above configuration, the second ring-shaped external gear provided on the rear portion of the rotating shaft portion via the mounting member is supported on the rotating plate body via the bearing member. It is not necessary to support the rear end portion of the rotating shaft portion with a rotating plate or the like at a position behind the external gear, and the rotating shaft portion can be shortened. That is, when the rotating shaft portion is shortened, the shield body can also be shortened, so that it is possible to improve the bending performance at the time of curve construction, and it is possible to improve the control performance by reducing the weight.

Hereinafter, a shield machine that excavates a tunnel having a substantially square cross section using the operating principle of the triangular triangle will be described.
[Embodiment]
Hereinafter, a shield machine according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1 to FIG. 3, the shield machine has a shield body 1 having a cross section formed in a substantially square shape, and a bearing 3 on a partition wall 2 provided on a front inner peripheral surface of the shield body 1. The circular rotary plate 4 supported rotatably around the central axis a of the shield body 1 and the central axis (also referred to as the rotational axis) a of the rotary plate 4 are eccentric by a predetermined distance e. A cylindrical member 5 attached so as to be inserted through the rotary plate 4 at the position b and having a through hole 5a formed in the center thereof, and a radial bearing (for example, an automatic adjustment) in the through hole 5a of the cylindrical member 5 A rotary shaft portion 7a that is rotatably inserted (supported) via 6), and three arm-shaped cutters that project radially from the front end portion of the rotary shaft portion 7a at equal angles. Cutter head 7 comprising a portion 7b and the rotating plate And a rotary drive device 8 that rotates the cutter plate 7 when the rotary plate 4 is rotated in a predetermined direction, the cutter head 7 is rotated at a speed 4/3 times in the opposite direction to the rotary plate 4. An interlocking mechanism 9 is provided.

  The rotational drive device 8 includes a first ring-shaped external gear 11 (having teeth on the outer peripheral surface) 11 provided in the vicinity of the outer periphery of the rotating plate 4 and protruding rearward, and the first ring-shaped outer gear. It is comprised from the rotational drive machine (for example, an electric motor is used) 12 which rotates the gearwheel 11 via the drive gearwheel (not shown).

  In addition, the interlocking mechanism 9 has a mounting bracket so as to have the same axis as the rotational axis a of the first ring-shaped external gear 11 at an inward position (opposite position) of the first ring-shaped external gear 11. A ring-shaped internal gear (having teeth provided on the inner peripheral surface) 15 attached to the shield body 1 side via 14 (which is also a mounting wall) and a rear portion of the rotary shaft portion 7a of the cutter head 7 A second ring-shaped external gear supported by a mounting bracket (an example of a mounting member) 16 and meshed with the ring-shaped internal gear 15 (a tooth portion is provided on the outer peripheral surface, and is an example of a gear body). ) 17 and the second ring-shaped external gear 17 is also supported on the rotating plate body 4 side via a swivel bearing (an example of a bearing member) 18 attached to the rear surface of the rotating plate body 4. Has been. The swivel bearing 18 is composed of cylindrical rollers 18a disposed on the three surfaces of the front and rear surfaces of the annular ridge 17a provided on the inner surface of the second ring-shaped external gear 17 and the inner peripheral surface. That is, these cylindrical rollers 18a provide support in the longitudinal thrust direction and the radial direction. Further, the ratio of the number of teeth of the ring-shaped internal gear 15 and the second ring-shaped external gear 17 is determined so that the rotary plate 4 rotates once in a predetermined direction, in other words, the cutter head supported by the tubular member 5. The cutter head 7 is configured to rotate about 4/3 times (relative angle) in the opposite direction around its axis while the 7 revolves by one rotation. That is, while the cutter head 7 is rotated once (rotated) in a predetermined direction with respect to the shield body 1, the rotary plate 4 is also rotated three times (revolved) in the opposite direction with respect to the shield body 1. Since the tip of the cutter part 7b moves in a square shape, a tunnel having a substantially square cross section is excavated.

  The first ring-shaped external gear 11 is also supported on the ring-shaped internal gear 15 side supported on the shield body 1 side via a swivel bearing 19 as a bearing member. The swivel base bearing 19 has the same configuration as the swivel base bearing 18 for supporting the second ring-shaped external gear 17 on the rotating plate body 4 side, and an annular ridge protruding from the outer surface of the ring-shaped internal gear 15. It is comprised by the cylindrical roller 19a arrange | positioned at three surfaces, the front-and-back surface of the part 15a, and an internal peripheral surface.

  In addition, although not shown in the figure, a screw type earth discharging device connected to the lower part of the partition wall 2 and for discharging the excavated earth and sand excavated by the cutter head 7 is disposed in the shield body 1. A segment assembling apparatus for installing the segment is disposed on the excavated tunnel inner wall surface, and a copy cutter 21 is disposed in the arm-shaped cutter portion 8 of the cutter head 7.

  In the shield machine, when the rotary driving machine 12 is operated, the rotary plate 4 rotates in a predetermined direction via the first ring-shaped external gear 11, and when the rotary plate 4 rotates in the predetermined direction, the rotary plate The cylindrical member 5 provided at the eccentric position of the body 4 revolves around the central axis a of the shield body 1 with a radius corresponding to the eccentric distance e.

  When the cylindrical member 5 revolves, the second ring-shaped external gear 17 attached to the rotary shaft portion 7a of the cutter head 7 moves with respect to the ring-shaped internal gear 15. The external gear 17 rotates in the direction opposite to the rotation direction of the rotating plate 4. By the rotation of both of them, the tip of the cutter head 7 (the tip of the arm-like cutter part 7b) moves in a square shape, and a substantially square tunnel is excavated.

  As described above, the second ring-shaped external gear 17 provided on the rear portion of the rotating shaft portion 7a via the mounting bracket 16 is supported on the rotating plate body 4 side via the swivel bearing 18, so that it is conventional. In addition, it is not necessary to support the rear end portion of the rotary shaft portion with a rotary plate or the like at a position rearward of the second ring-shaped external gear, and therefore the rotary shaft portion can be shortened. As described above, when the rotary shaft portion 7a is shortened, the shield body 1 can also be shortened, so that it is possible to improve the bending performance at the time of curve construction and to improve the control performance by reducing the weight. be able to. Further, when the rotation shaft portion 7a is shortened, the manufacturing accuracy is improved and the generated bending is reduced, and therefore, the shaft center is prevented from swinging when the rotation shaft portion is supported at two locations of the partition wall and the support wall. Therefore, the reliability of excavation work (excavation control) can be improved.

  By the way, in the said embodiment, the cylindrical roller 18a is arrange | positioned as the swivel base bearing 18 which supports the 2nd ring-shaped external gearwheel 17 in the rotating plate body 4 side on the three surfaces (3 directions) of the cyclic | annular convex part 17a. However, as shown in FIG. 4, for example, a swivel bearing 31 formed of a single row ball bearing may be used. Of course, the inner ring 31a side of the ball bearing 31 that is a swivel bearing is attached to the rotating plate body 4 side, and the outer ring 31b side is attached to the second ring-shaped external gear 17 side. The swivel bearing 31 supports thrust and radial loads acting in the forward and backward directions. The moment load acting on the rotating shaft portion 7a is supported by the swivel bearing 31 and the radial bearing 6 provided at the front portion.

  Further, as shown in FIG. 5, when the rotating shaft portion 7 a is supported on the tubular member 5, a thrust bearing 32 made of a ball bearing may be provided in addition to the radial bearing 6. The moment load acting on the rotating shaft portion 7a is supported by the swivel bearing 31 that supports the second ring-shaped external gear 17 and the radial bearing 6 provided at the front portion of the rotating shaft portion 7a, and the rotating shaft portion 7a. A thrust load acting in the forward direction acting on is supported by a thrust bearing 32. The thrust load acting in the backward direction is supported by the swivel bearing 31.

It is sectional drawing of the shield machine which concerns on embodiment of this invention. It is a front view of the shield machine. It is a rear view of the same shield machine. It is sectional drawing which shows the modification of the same shield machine. It is sectional drawing which shows the modification of the same shield machine. It is sectional drawing of the shield machine of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield body 2 Bulkhead 4 Rotating plate body 5 Cylindrical member 5a Through-hole 7 Cutter head 7a Rotating shaft part 7b Arm-shaped cutter part 8 Rotation drive device 9 Interlocking mechanism 11 1st ring-shaped external gear 12 Rotation drive machine 15 In ring shape Gear 16 Mounting bracket 17 Second ring-shaped external gear 18 Swivel bearing 18a Cylindrical roller 31 Swivel bearing 32 Radial bearing

Claims (1)

Three arm-shaped cutters project at equiangular positions on the front end of the rotating shaft at a position eccentric to the rotating shaft center on the rotating plate provided on the front of the shield body. A rotating mechanism that supports the cutter head formed in a rotatable manner and rotates the rotating plate body in a predetermined direction by a rotary drive through a first ring-shaped external gear attached in the vicinity of the outer periphery thereof. A shield machine that rotates the cutter head in the reverse direction at a speed of 4/3 times to excavate a substantially square tunnel by the arm-shaped cutter unit,
The interlocking mechanism is attached via a mounting member to a ring-shaped internal gear supported on the shield body side so as to have the same axis as the first ring-shaped external gear, and to the rear portion of the rotary shaft portion of the cutter head. And a second ring-shaped external gear meshing with the ring-shaped internal gear.
A shield machine according to claim 1, wherein the second ring-shaped external gear is supported on the rotating plate body side via a bearing member.

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