JP3792071B2 - Shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield machine for excavating a tunnel having an elliptical or rectangular cross section by rotating a cutter head formed based on a triangle of Luro and revolving around an eccentric axis. .
[0002]
[Prior art]
Conventionally, a shield machine that can excavate a tunnel having an elliptical cross section is disclosed in, for example, Japanese Patent Laid-Open No. 6-307190.
In this shield machine, as shown in FIG. 8, a through hole 104 is formed at a position eccentrically supported by a predetermined distance e while being rotatably supported by a cylindrical support 103 provided on the front partition wall 102 of the shield body 101. The cylindrical rotating body 105, the first rotation driving device 107 that rotates the cylindrical rotating body 105 via the first gear 106 provided at the rear end thereof, and the through hole of the cylindrical rotating body 105. A rotary shaft 108 that is rotatably inserted in 104, a cutter head 109 having a triangular shape provided on the front end of the rotary shaft 108, and a rear end of the rotary shaft 108. And a second rotation driving device 111 for rotating the cutter head 109 via the second gear 110, and the first rotation driving device 107 is provided on the shield body 101 side. Rutotomoni, said second rotary drive device 111 has been attached to the hollow rotating body 105 side.
[0003]
And in the said structure, while driving each rotation drive device 107,111, while rotating the cutter head 109 by predetermined speed, revolving the cylindrical rotary body 105 in the same direction at 3 times that speed, A tunnel with an elliptical cross section was excavated.
When the cylindrical rotating body 105 is rotated at a rotational speed three times that of the cutter head 109 and both are rotated in opposite directions, a tunnel having a rectangular cross section is excavated.
[0004]
[Problems to be solved by the invention]
According to the configuration of the conventional shield machine, since the second rotation driving device 111 for rotating the cutter head 109 is attached to the cylindrical rotating body 105 side, the excavation resistance acting on the cutter head 109 is all The first rotary drive device 107 that revolves the cutter head 109 is added to the first rotary drive device 107 side. Therefore, the first rotary drive device 107 requires large power and is uneconomical.
[0005]
In addition, when attempting to excavate a tunnel having a large cross section, it is necessary to increase the drive capability of the first rotary drive device 107, but the volume occupied by the device is large, making it actually difficult to install in the shield body. There was a problem of becoming.
Therefore, an object of the present invention is to provide a shield machine that can reduce the required power of a rotary drive device that rotates a cutter head.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a first shield machine according to the present invention is provided with a cylindrical rotating body in which a horizontal through hole is formed at an eccentric position at a front portion of a shield body so as to be rotatable. Provided on the main body side is a first rotation driving device for rotating the cylindrical rotating body via a first gear provided on the cylindrical rotating body side, and the rotary shaft body is rotatably inserted into the through hole of the cylindrical rotating body. A first support body provided with a second rotation driving device for attaching the cutter head to the front end portion of the rotary shaft body and attaching the second gear to the rear portion and rotating the second gear on the rotary shaft body side is provided. The first support body is supported by the first support body via a first support shaft section that protrudes in a plane perpendicular to the shield body axis on both sides of the first support body. It is supported so as to be movable on the second support in the axial direction. The second support body is disposed on the shield body side in the axial direction of the second support shaft portion via the second support shaft portions projecting on both sides in a direction different from the first support shaft portion by 90 degrees. It is movably supported.
[0007]
According to said structure, the 2nd rotational drive device which rotates the rotating shaft body supported in the position eccentric to the cylindrical rotary body via two support bodies supported so that a movement in a 90 degree mutually different direction was possible. Thus, since the revolution of the rotary shaft body is supported on the shield body side, that is, the cutter head can be allowed to revolve, the excavation reaction force during the revolution of the cutter head can be supported on the first rotation drive device side. In addition, the excavation reaction force at the time of rotation of the cutter head can be supported on the second rotation drive device side, and therefore, all the excavation reaction force of the cutter head can be supported by one rotation drive device as in the prior art. It is not necessary to increase the required power of the rotary drive device as compared with the one received, and therefore, it is very economical and the excavation capability can be increased without increasing the capability of the rotary drive device.
[0008]
The second shield machine of the present invention is provided on the shield body side, and a cylindrical rotating body that is rotatably provided at the front portion of the shield body and has a horizontal through hole formed at an eccentric position. And a first rotation driving device for rotating the cylindrical rotating body via a first gear provided on the cylindrical rotating body side, and a rotatable rotation through the through hole of the cylindrical rotating body, and at the front end portion A rotating shaft body having a cutter head and a second gear attached to the rear end thereof, a second rotary driving device for rotating the second gear while being rotatably supported on the rotating shaft side, and a shield A first support body having first support shafts projecting on both sides in a plane orthogonal to the main body axis, and the first support body via the first support shaft parts, the shaft of the first support shaft section. The first support shaft portion is held so as to be movable in the center direction. Is composed of a second support body held movably in the axial direction of the second support shaft portion on the shield body side via second support shaft portions projecting on both sides in directions different by 90 degrees. A plurality of the excavated bodies are juxtaposed in front of the shield body, and the first gears of the excavated bodies are interlocked and connected via an intermediate gear.
[0009]
According to the configuration of the second shield machine, a plurality of excavating bodies including the cutter head and the driving portion thereof in the first shield machine are juxtaposed, so that a tunnel whose cross section is elongated in a predetermined direction can be excavated. it can.
Further, in each of the shield machines, a third gear fixed at a rear position of the rotary shaft body and on the central axis of the shield body, and attached to a rear end portion of the rotary shaft body and outside the third gear. A speed adjusting mechanism including a ring-shaped fourth gear having internal teeth meshing with the teeth is provided.
[0010]
In each of the shield machines, a fourth ring-shaped gear fixed at the rear position of the rotary shaft body and on the central axis of the shield body, and attached to the rear end portion of the rotary shaft body and the fourth And a third gear having external teeth meshing with the internal teeth of the gear.
By providing such a speed adjustment mechanism, the ratio between the rotation speed and the revolution speed of the cutter head can be reliably maintained at a predetermined value.
[0011]
Embodiment
Hereinafter, the shield machine according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
1 and 2, reference numeral 1 denotes a shield body of a shield machine, and a cylindrical support 2 is attached to a central front position inside the shield main body via a front partition wall 3, and a central space of the cylindrical support 2 is shown. A cylindrical rotating body 5 in which a horizontal and front-rear through-hole 4 is formed eccentrically with a predetermined distance (hereinafter referred to as an eccentricity amount) e with respect to the central axis a of the cylindrical support 2 is provided in a bearing 6. It is inserted freely through the.
[0012]
A rotating shaft body 8 is rotatably inserted into the through hole 4 of the cylindrical rotating body 5 via a bearing 7, and a cutter head 9 is attached to a front end portion of the rotating shaft body 8. Yes.
The cutter head 9 is shaped so that the front view shape is a triangle of a ruler. That is, as shown in FIG. 2, the shape is surrounded by three subarcs S passing through the other two vertices with one side as a radius, with an arbitrary vertex of the equilateral triangle as the center.
[0013]
A first gear 11 having external teeth 11 a is formed at the rear end portion of the cylindrical rotating body 5, and an external tooth of the first gear 11 is provided on a support bracket 12 provided on the shield body 1 side. A plurality of first rotation driving devices (for example, an electric motor, a hydraulic motor, etc. are used) 14 for rotating the first pinion 13 meshing with the 11a are arranged along the circumferential direction.
[0014]
When the cylindrical rotating body 5 is rotated by the first rotation driving device 14, the rotating shaft body 8 is revolved with respect to the central axis a of the shield body 1 by the eccentric amount e.
In addition, a rotational drive mechanism 15 for rotating the rotating shaft body 8 while allowing the rotating shaft body 8 to revolve is provided at the rear portion of the cylindrical rotating body 5 of the shield body 1.
The rotary drive mechanism 15 is configured to cover the entire second gear 21 and the second gear 21 attached to the outer periphery of the rear portion of the rotary shaft 8, and is rotatably held by the rotary shaft 8. In addition, a first support body 23 provided with a pair of first support shaft portions 22 projecting in a horizontal direction at a 180-degree symmetrical position, and attached to the first support body 23 at a plurality of locations and attached to the second gear 21. A second rotation drive device (for example, an electric motor or a hydraulic motor is used) 25 having a meshed second pinion 24 and an annular shape surrounding the first support 23 and both the first support shafts The portion 22 is supported so as to be slidable (movable) in the axial direction b of the first support shaft portion 22 via a sliding bearing (actually formed of a bracket provided with a bush) 26, and the first 1 Support shaft 22 and 90 And a second support 28 having a pair of second support shaft portions 27 that protrude in a vertical (cylinder) different (orthogonal) vertical direction c at 180 ° symmetrical positions, and project from the second support 28. The second support shaft portion 27 slides in the vertical direction c via a slide bearing (actually, a bracket provided with a bush) 29 on the support bracket 12 side provided on the shield body 1 side. Supported (movable) is supported.
[0015]
That is, the first support body 23 provided with the second rotation driving device 25 for rotating the rotary shaft body 8 is horizontal in the tunnel cross section through the pair of first support shaft portions 22 protruding left and right. The second support 28 is supported on the shield body 1 side so as to be slidable in the vertical direction c within the tunnel cross section. .
[0016]
In addition, the ratio of the rotation speed and the revolution speed of the cutter head 9 is set to 1: 3 by the rotary drive devices 14 and 25. In order to reliably maintain the speed ratio, A speed adjustment mechanism 31 is provided.
The speed adjusting mechanism 31 is attached to the third gear 32 fixed on the central axis of the shield body 1 of the rear partition 10 provided at the rear position of the rotating shaft 8 and the rear end of the rotating shaft 8. And a ring-shaped fourth gear 33 having internal teeth 33a meshing with the external teeth 32a of the third gear 32, and the ratio of the number of teeth between the internal teeth 32a and the external teeth 33a is 3 pairs. It is supposed to be 1.
[0017]
That is, when the cylindrical rotating body 5 is rotated three times, the rotating shaft body 8 is rotated once, so that a tunnel having an elliptical cross section is excavated.
A copy cutter device 41 using a hydraulic cylinder or the like is disposed at a predetermined outer peripheral vertex of the cutter head 9, and the hydraulic pressure is supplied to the copy cutter device 41 within the cutter head 9 and the rotary shaft. The supply of driving power to the second rotary drive device 25 is also performed when the slip ring is hydraulic in the case of electricity, and is supplied by the hydraulic pipe 42 inserted through the center of the body 8 and the third gear 32. As with the copy cutter device 41, this is performed via hydraulic piping formed on the rotary shaft 8 and the third gear 32. Furthermore, when an electrical wiring or a hydraulic hose is connected to the second rotation drive device 25, it is sufficient to have a slack that allows the movement amounts of the first support shaft portion 22 and the second support shaft portion 27.
[0018]
In the above configuration, when excavating a tunnel, the first rotary drive device 14 rotates the cutter head 9 in the predetermined direction at a predetermined speed via the rotary shaft body 8 and the second rotary drive device 25 rotates the cylinder. By rotating the body 5 at a speed three times that of the cutter head 9 and in the same direction as the rotary shaft body 8, a tunnel having an elliptical section can be excavated.
[0019]
By the way, the rotating shaft 8 is supported at a position away from the central axis a of the shield body 1 which is the rotation axis of the cylindrical rotating body 5 by a predetermined distance e. The second rotation drive device 25 for rotating the rotary shaft 8 is shielded via the first support 23 and the second support 28, while revolving on the locus of a circle having a radius e. Since it is supported on the main body 1 side, that is, supported so as to be movable in the horizontal direction and the vertical direction, it can follow the revolution without any trouble.
[0020]
According to the above-described configuration, the entire excavation reaction force of the cutter head 9 does not act as a load on the first rotation drive device 14 that revolves the cutter head 9, that is, the excavation reaction force is generated by the two rotation drive devices 14 and 25. Therefore, it is not necessary to increase the required power of each rotary drive device, so that it becomes very economical. Furthermore, the excavation capability can be increased without increasing the capability of the rotary drive device. .
[0021]
In the above configuration, the rotating shaft body 8 and the cylindrical rotating body 5 have been described so that the rotation direction and the revolution direction of the cutter head 9 are in the same direction. As shown by a virtual line in FIG. 2, a tunnel having a rectangular cross section, more precisely, a square cross section can be excavated.
However, in this case, with respect to the speed adjustment mechanism 31, the positions where the third gear 32 and the ring-shaped fourth gear 33 are provided are opposite to each other. That is, as shown in FIG. 3, a ring-shaped fourth gear 33 is fixed on the central axis of the shield body 1 of the rear partition 10 provided at the rear position of the rotary shaft 8, and the rotary shaft A third gear 32 having external teeth 32a meshing with the internal teeth 33a of the fourth gear 33 is attached to the rear end of the body 8, and the ratio of the number of teeth between the internal teeth 33a and the external teeth 32a is as follows. 3: 1.
[0022]
By the way, in the above embodiment, the front view of the cutter head 9 is a triangular triangle, but for example, as shown in FIG. 4, a three-arrow cutter with three arms projecting radially every 120 degrees. A head 9 'can also be used.
Next, a shield machine according to a second embodiment of the present invention will be described with reference to FIG.
[0023]
In the first embodiment, the description has been given of the case where one cutter head is arranged at the front portion of the shield body. However, in the second embodiment, two pieces are provided at the front portion of the shield body. The cutter head is arranged in parallel.
That is, as shown in FIG. 5, the shield machine is rotatably provided at a position eccentric with a predetermined distance e with respect to the central axes f and g of the left and right front portions of the shield body 51 and horizontally. Via a pair of left and right cylindrical rotating bodies (not shown) having through holes in the direction, and a first gear 52 (52A, 52B) supported on the shield body 51 side and provided on each cylindrical rotating body side. The first rotary drive device 53 (53A, 53B) that rotates each cylindrical rotating body, and the cutter head 54 (54A, 54A, 53B) are inserted into the through holes of the cylindrical rotating bodies so as to be rotatable. 54B) and a rotary shaft body 55 (55A, 55B) each having a second gear (not shown) attached to the rear end thereof, and each of the rotary shaft bodies 55 is rotatably held and each of the above-mentioned Turn the second gear The first support shaft portions 61 (61A, 61B) are respectively provided on both sides in a plane orthogonal to the central axes f, g of the shield body 51. While supporting each 1st support body 62 via the 1st support body 62 (62A, 62B) and each of these 1st support shaft parts 61 in the axial center direction of the 1st support shaft part 61, The axial direction of the second support shaft 63 on the shield body 51 side via the second support shaft 63 (63A, 63B) projecting on both sides in a direction different from the first support shaft 61 by 90 degrees. Two excavation bodies 71 (71A, 71B) each composed of a second support body 64 (64A, 64B) each slidably supported at the front of the shield body 51 are juxtaposed. The first gears 52A and 52B of the excavated bodies 71A and 71B , Two intermediate gear 81 (81A, 81B) is obtained by interlockingly connected through.
[0024]
Further, the cutter heads 54A and 54B provided on the excavating bodies 71A and 71B are configured such that one (54A) is a triangular triangle and the other (54B) has a radially protruding arm every 120 degrees. It has a three-headed shape.
In this case, when the two cutter heads 54A and 54B rotate and revolve, respectively, an elliptical tunnel that is long in the horizontal direction is excavated. Of course, the two cutter heads 54A and 54B are controlled by the two intermediate gears 81A and 81B so that their rotational phases are shifted, that is, the cutter heads 54A and 54B are not in contact with each other. Also in this shield machine, a speed adjusting mechanism is provided for ensuring the ratio between the rotation speed and the revolution speed of each cutter head 54 (54A, 54B) as required.
[0025]
Also in the configuration of this shield machine, the same effects as those of the first embodiment described above can be obtained.
Of course, in this case as well, if the rotation direction of the cutter head rotates and revolves in the same direction, a tunnel having a rectangular cross section can be excavated as indicated by a virtual line.
[0026]
In the second embodiment, the shapes of the two cutter heads are different from each other. However, as shown in FIG. Further, as shown in FIG. 7, the two cutter heads 92A and 92B may have a three-pointed arrow shape. 6 and 7, the solid line indicates an elliptical tunnel, and the virtual line indicates a rectangular tunnel.
[0027]
In the shield machine according to the second embodiment (shown in FIGS. 5 to 7), two cutter heads are juxtaposed, but three or more can be juxtaposed.
By the way, in each said embodiment, while providing the 1st support shaft part of the 1st support body in the horizontal direction, the 2nd support shaft part of the 2nd support body was provided in the perpendicular direction, but the direction is arbitrary. In short, the first support shaft portion and the second support shaft portion only need to be provided in directions different from each other by 90 degrees.
[0028]
【The invention's effect】
As described above, according to each configuration of the present invention, the two rotary drive devices that rotate the rotating shaft supported at the position eccentric to the cylindrical rotating body are supported so as to be movable in directions orthogonal to each other. Since the revolving of the rotary shaft body is supported on the shield body side through the support body, that is, the revolving of the cutter head can be allowed, the excavation reaction force at the revolving of the cutter head is directed to the first rotation drive device side. And the excavation reaction force at the time of rotation of the cutter head can be supported on the second rotational drive device side, and therefore all the excavation reaction forces of the cutter head can be It is not necessary to increase the required power of the rotary drive device as compared with that received by the rotary drive device, and therefore it is very economical and increases the excavation capability without increasing the capability of the rotary drive device. This Can.
[0029]
Further, in each of the above configurations, by providing a speed adjustment mechanism that adjusts the rotation speed and the revolution speed of the rotating shaft body, the speed ratio between the rotation speed and the revolution speed of the cutter head is reliably set to a predetermined value. Can be maintained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a shield machine according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
FIG. 3 is a schematic side view of a speed adjustment mechanism in a modification of the shield machine according to the first embodiment.
FIG. 4 is a front view showing a modification of the cutter head in the shield machine according to the first embodiment.
FIG. 5 is a rear view showing a schematic configuration of a shield machine according to a second embodiment of the present invention.
FIG. 6 is a front view showing a modification of the cutter head in the shield machine according to the second embodiment.
FIG. 7 is a front view showing a modification of the cutter head in the shield machine according to the second embodiment.
FIG. 8 is a cross-sectional view of a shield machine in a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield main body 2 Cylindrical support body 4 Through-hole 5 Cylindrical rotary body 8 Rotary shaft body 11 1st gear 11a External tooth 13 1st pinion 14 1st rotational drive device 15 Rotation drive mechanism 21 2nd gear 22 1st support shaft part 23 1st support body 24 2nd pinion 25 2nd rotation drive device 27 2nd support shaft part 28 2nd support body 31 Speed adjustment mechanism 32 3rd gearwheel 32a External tooth 33 4th gearwheel 33a Internal tooth 51 Shield main body 52 1st Gear 53 First rotation driving device 54 Cutter head 55 Rotating shaft 61 First support shaft 62 First support 63 Second support shaft 64 Second support 71 Excavation body 81 Intermediate gear

Claims (4)

At the front part of the shield body, a cylindrical rotating body having a horizontal through hole formed at an eccentric position is rotatably provided, and the shield body side is provided with a first gear provided on the cylindrical rotating body side. A first rotation driving device for rotating the cylindrical rotating body;
A rotating shaft body is rotatably inserted into the through hole of the cylindrical rotating body, a cutter head is attached to the front end portion of the rotating shaft body and a second gear is attached to the rear portion,
A first support body provided with a second rotation driving device for rotating the second gear on the rotary shaft side is rotatably supported.
The first support body is second in the axial direction of the first support shaft section through the first support shaft section projecting from both sides of the first support body in a plane orthogonal to the shield body axis. Supporting the support so as to be movable,
The second support body is placed on the shield body side through the second support shaft portions projecting on both sides in a direction different from the first support shaft portion by 90 degrees, and the axial direction of the second support shaft portion A shield machine that is supported so as to be movable in A cylindrical rotating body that is rotatably provided at the front of the shield body and has a horizontal through hole formed at an eccentric position;
A first rotation driving device that is provided on the shield body side and rotates the cylindrical rotating body via a first gear provided on the cylindrical rotating body side;
A rotating shaft body that is rotatably inserted into the through hole of the cylindrical rotating body, and has a cutter head attached to the front end portion and a second gear attached to the rear end portion;
The rotary shaft body is rotatably supported and supports a second rotation driving device for rotating the second gear, and first support shaft portions project from both sides in a plane orthogonal to the shield body axis. A first support,
The first support body is held via the first support shaft portions so as to be movable in the axial direction of the first support shaft portion, and protrudes on both sides in a direction different from the first support shaft portion by 90 degrees. An excavated body constituted by a second support body held movably in the axial direction of the second support shaft part on the shield body side via the provided second support shaft part,
A shield excavator characterized in that a plurality of juxtapositions are arranged in front of the shield body, and the first gears of each excavated body are linked together via an intermediate gear. A ring having a third gear fixed at the rear position of the rotating shaft and on the central axis of the shield body, and an inner tooth attached to the rear end of the rotating shaft and meshing with the external teeth of the third gear The shield machine according to claim 1, further comprising a speed adjusting mechanism configured by a fourth gear having a shape. A ring-shaped fourth gear fixed to the rear axis of the rotating shaft and on the central axis of the shield body, and external teeth attached to the rear end of the rotating shaft and meshing with the inner teeth of the fourth gear 3. The shield machine according to claim 1, further comprising a speed adjustment mechanism configured by a third gear including

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