JPH05209497A - Shield excavator - Google Patents

Abstract

PURPOSE:To excavate a rectangular form of tunnel by a method in which a cutter head having three arm cutters or equilateral triangular face plates is turned and the rotary center is biased and reversely turned with a given multiple speed. CONSTITUTION:A cylindrical rotator 6 having a horizontal through-hole 5 on a biased position is provided to the front of a shield machine 1, and a rotary shaft 9 is rotatably set in the hole 5, and a cutter head 11 having radially and projectionally set three arm cutters 10 at equal angle intervals is attached to the front end of the shaft 9. The first drive motor 13 is then attached to the rear of the rotator 6 and the second drive motor 15 to turn the rotator 6 with three times' speed to the opposite direction of the turning direction of the rotator 9 is provided to the shield machine 1 side. The cutter head 11 is turned to a given direction and the turning center is biased to turn it with three times' speed to the opposite direction. A triangular form of tunnel can thus be excavated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine capable of excavating a tunnel having a rectangular cross section.

[0002]

2. Description of the Related Art Conventionally, as tunnel excavators having a rectangular cross section, there are those disclosed in JP-A-2-66295 and JP-A-2-315592. A tunnel excavator disclosed in Japanese Patent Laid-Open No. 2-66295 discloses a pair of left and right drum cutters at a front portion of a shield machine main body, and a pair of ring cutters arranged above and below a central space of the drum cutters. And a drum for excavation is arranged and rotated over the entire cross section of the rectangular tunnel.

Further, the shield machine disclosed in Japanese Patent Laid-Open No. 2-315592 has a side cutter which is moved by a moving means along a predetermined locus in addition to the center cutter.

[0004]

According to the structure of the conventional tunnel excavation device, the shield excavator main body is provided with
There is a problem that a large drum cutter must be arranged at least on both sides of the ring cutter so as to substantially correspond to the entire rectangular cross section of the tunnel, which makes the device very expensive. According to the structure of the conventional shield machine, the side cutter is required to have a moving means for moving along a predetermined locus, and the side cutter itself needs to have a rotation drive mechanism, which makes the drive mechanism extremely complicated as a whole. Had the problem of becoming.

Therefore, an object of the present invention is to provide a shield machine capable of solving the above problems.

[0006]

In order to solve the above-mentioned problems, the first means of the present invention is to provide a cylindrical rotating body in which a horizontal through hole is formed at an eccentric position in the front part of the shield body. The rotary head is rotatably provided, and the rotary shaft is rotatably arranged in the through hole. A cutter head is provided at the front end of the rotary shaft with three arm-shaped cutters projecting radially at equal angles. A first rotation drive device for rotating the rotary shaft body is provided at the rear of the tubular rotary body, and the cylindrical rotary body is mounted on the shield body side in a direction opposite to the rotation direction of the rotary shaft body. In addition, the shield machine is provided with a second rotation drive device that rotates at a triple speed.

In order to solve the above-mentioned problems, the second means of the present invention is, in the front part of the shield body, the cylindrical rotary member described in the first means, which can be rotated by the cylindrical rotary member. A rotary shaft body supported by the rotary shaft body, a cutter head having three arm-shaped cutters provided at the front end of the rotary shaft body, a first rotary drive device for rotating the rotary shaft body, and the cylindrical rotary body. This is a shield machine having a plurality of sets of cutter head mechanisms each including a second rotary drive device.

Further, in order to solve the above-mentioned problems, the third means of the present invention uses a cutter head whose face plate has a substantially equilateral triangle shape, instead of the cutter head in the above-mentioned first or second means. It is a shield machine.

[0009]

In the above structure, the cutter head having three arm-shaped cutters protruding radially at equal angles or the cutter head having a substantially equilateral triangular face plate is rotated in a predetermined direction, and the center of rotation thereof is rotated. By eccentric and rotating in a direction opposite to the cutter head and at a triple speed, a tunnel having a rectangular cross section can be excavated.

Further, by installing a plurality of cutter head mechanisms, it is possible to excavate a tunnel having a rectangular cross section which is long in a predetermined direction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 is a shield main body of a shield machine, and a cylindrical support 2 is attached to a center front position inside the shield main body via a partition wall 3 and a ring girder 4, and a predetermined space is provided in a central space of the cylindrical support 2. A cylindrical rotating body 6 in which a horizontal through-hole 5 is formed at a position eccentric with an eccentricity r is rotatably provided via a bearing 7.

A rotary shaft body 9 is rotatably disposed in the through hole 5 of the cylindrical rotary body 6 via a bearing 8, and the front end portion of the rotary shaft body 9 is 120 degrees. Every 3
A cutter head 11 is provided, in which arm-shaped cutters 10 having the same length are radially projected.
That is, the center of rotation of the cutter head 11 is provided at a position eccentric from the center of the shield body 1 by the distance r.

At the rear portion of the cylindrical rotary body 6, an electric or hydraulic first drive motor (first drive motor) (first drive motor) for rotating the rotary shaft body 9 in the direction (a) of FIG. 1 rotation driving device) 13 is provided,
The tubular rotating body 6 is attached to the ring girder 4 on the side of the shield body 1 via the mounting bracket 14 in a direction (b) opposite to the rotating direction (a) of the rotating shaft 9 and at a triple angular velocity. An electric or hydraulic second drive motor (second rotary drive device) 15 for rotating the motor is provided.

That is, when the first driven gear 21 is attached to the rear end portion of the rotary shaft body 3, the output shaft 13a of the first drive motor 13 meshes with the first driven gear 21. The first drive-side gear 22 is attached, the ring-shaped second driven-side gear 23 is attached to the rear end portion of the tubular rotating body 6, and the output shaft 15 of the second drive motor 15 is attached.
A second drive gear 24 meshing with the second driven gear 23 is attached to a.

A rotary joint (for example, a slip ring or a hydraulic rotary joint) 31 for supplying power or hydraulic pressure to the drive motors 13 and 15 is provided at the central position of the shield body 1 of the mounting bracket 12. Sealing materials 32 and 33 for preventing intrusion of earth and sand are provided between the cylindrical rotating body 6 and the cylindrical support body 2 and between the rotating shaft body 9 and the cylindrical rotating body 6.

In the above structure, the through hole 5 with respect to the mounting center of the arm cutter 10, that is, the distance R from the center of rotation to the tip, is the radial distance of the locus drawn by the center of rotation of the rotary shaft 9, that is, the center of the shield body 1. Of the eccentricity r is set to an appropriate value, and the rotating shaft 9 is rotated in the direction of the arrow (a) in FIG. 2 at a predetermined angular velocity (angular velocity of ω with respect to the shield body) to form a tubular shape. When the rotating body 6 is rotated in the (b) direction and at an angular velocity three times the angular velocity (3 × ω angular velocity with respect to the shield body),
The center of the rotary shaft 9 revolves around the center of the shield body 1 along a locus of radius r as shown by the arrow (c), and therefore, as shown by the phantom line in FIG. Since the tip of the cutter 10 draws a rectangular trajectory, a tunnel having a rectangular cross section can be excavated.

As shown in FIG. 2, when the rotation center of the arm-shaped cutter 10 moves between points a to e, the tip of the arm-shaped cutter 10 moves between points A to E. Here, the specific number of rotations will be described. For example, when the number of rotations of the arm cutter 10 with respect to the shield body 1 is 2 rpm, the cylindrical rotating body 6 has 6 rpm in the opposite direction (b) to the shield body 1. Is rotated. By the way, since the first drive motor 13 itself for rotating the rotary shaft body 9 is attached to the tubular rotary body 6 side,
In order to rotate the arm-shaped cutter 10 with respect to the shield body 1 in the (a) direction at 2 rpm, it is necessary to rotate the rotary shaft body 9 itself in the (a) direction at 8 rpm.

Here, focusing on one arm-shaped cutter 10, the locus when it is rotated under the same conditions as described above,
When drawn by a computer, it becomes as shown in FIG. However, the distance ratio (R / r) in this case is 8.3.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the first embodiment,
The case where one cutter head that is eccentrically rotated is provided has been described, but in the second embodiment, two cutter heads are provided.

In the description of the second embodiment, two cutter head mechanisms similar to those of the first embodiment are provided, so that the description will be simplified and
The same parts as those in the first embodiment are designated by the same reference numerals.

In the shield machine according to the second embodiment, as shown in FIGS. 4 and 5, cylindrical supports 2 are provided at the left and right front positions inside the shield body 1, and the cylindrical supports 2 are provided. In the central space of the body 2, a cylindrical rotating body 6 having a through hole 5 formed at a position eccentric with an eccentric amount r is rotatably provided via a bearing 7.

Then, each through hole 5 of these cylindrical rotary members 6
A rotary shaft body 9 is rotatably disposed inside the rotary shaft body 9 through a bearing 8. At the front end portion of the rotary shaft body 9, three arm-shaped cutters 10 each having an equal length are arranged at intervals of 120 degrees. The cutter head 11 is formed by radially projecting.

Further, at the rear portion of each of the cylindrical rotary bodies 6, the rotary shaft body 9 is mounted through a mounting bracket 12.
5 are provided with electric or hydraulic first drive motors (first rotary drive devices) 13 for rotating in the direction (a) of FIG. 5, and the ring girder 4 on the shield body 1 side is provided with a mounting bracket 14. Then, each of the cylindrical rotating bodies 6
Is provided with an electric or hydraulic second drive motor (second rotary drive device) 15 for rotating the rotary shaft body 9 in a direction (b) opposite to the rotation direction (a) of the rotary shaft body 9 and at a triple angular velocity. ing.

That is, the cylindrical rotating body 6, the rotating shaft body 9 rotatably supported by the cylindrical rotating body 6, and the rotating shaft body 9
A cutter head 11 having three arm-shaped cutters 10 provided at the front end of the rotary shaft body 9 for rotating the rotary shaft body 9;
Two sets of cutter head mechanisms each including a drive motor 13 and a second drive motor 15 for rotating the cylindrical rotating body 6 are provided.

To facilitate the curved construction, a copy cutter 41 is provided at the tip of the arm-shaped cutter 10, and a hydraulic rotary joint 42 for supplying an operating hydraulic pressure to the copy cutter 41 is provided. It is attached to the rear end of the rotary shaft body 9.

In the above structure, the through hole 5 with respect to the mounting center of the arm-shaped cutter 10, that is, the distance R from the center of rotation to the tip, is the radial distance of the trajectory drawn by the center of rotation of the rotating shaft 9, that is, the center of the shield body 1. The ratio of the eccentricity to the eccentricity r is set to an appropriate value, and the rotating shafts 9 are rotated in the direction of arrow (a) in FIG. 5 at a predetermined angular velocity (angular velocity of ω with respect to the shield body) while When the rotary body 6 is rotated in the (b) direction and at an angular velocity three times the angular velocity (3 × ω angular velocity with respect to the shield body),
The center of each rotating shaft body 9 revolves around the center of the shield body 1 with a locus of radius r as shown by the arrow (c), and therefore, as shown by the phantom line in FIG. Each arm-shaped cutter 1 in the cutter head 11
Since the tip of 0 draws a rectangular trajectory, it is possible to excavate a rectangular tunnel whose cross-sectional shape is long in the lateral direction.

As shown in FIG. 5, as in the first embodiment, when the rotation center of the arm-shaped cutter 10 moves between points a to e, the tip of the arm-shaped cutter 10 becomes points A to E. Move between.

Further, the rotation phases of the both cutter heads 11 are, of course, so that the arm-shaped cutters 10 of the both cutter heads 11 do not collide with each other.
5, respectively.

Further, in the second embodiment, two cutter head mechanisms are arranged side by side in the lateral direction, but two cutter head mechanisms may be arranged side by side in the vertical direction, and three or more cutter head mechanisms may be arranged side by side. You can also

In the shield machine of each of the above-mentioned embodiments, the excavated soil is carried out by a mud pressure shield machine, by a mud pipe, and by a mud pressure shield machine, as shown in FIG. As shown in FIG. 4, the soil is discharged by the screw conveyor type soil discharging device 45.

By the way, in each of the above-mentioned embodiments, the cutter head in which the three arm-shaped cutters are radially provided is used. However, as shown in FIG. 6, the outer peripheral surface of the cutter head 51 has three arc portions. Even in the case of using the face plate 52 having the above-mentioned configuration and the tip portion protruding in three directions, a tunnel having a rectangular cross section can be excavated in the same manner as described above. Of course, the triangle-shaped vertices coincide with the vertices of an equilateral triangle. In addition,
In FIG. 6, reference numeral 53 is a sediment intake port.

[0032]

As described above, according to the configuration of the present invention, 3
By rotating the center of rotation of the cutter head in which the arm-shaped cutters of the book are projected radially at equal angles, or the face plate has a substantially equilateral triangle shape, in the opposite direction with a predetermined eccentric distance, Since the tunnel having a rectangular cross section is excavated, it is possible to provide a shield machine having an extremely simple structure and a low cost as compared with the conventional configuration.

Further, when a plurality of cutter head mechanisms are installed, it is possible to excavate a tunnel having a rectangular cross section which is long in a predetermined direction.

[Brief description of drawings]

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

FIG. 2 is a view taken in the direction of arrows HH in FIG.

FIG. 3 is a diagram showing a locus of the tip of the arm-shaped cutter in the first embodiment.

FIG. 4 is a sectional view of a shield machine according to a second embodiment of the present invention.

5 is a view taken along the line I-I of FIG.

FIG. 6 is a front view showing a modified example of the cutter head in the shield machine of each embodiment of the present invention.

[Explanation of symbols]

 1 Shield Main Body 2 Cylindrical Support 5 Through Hole 6 Cylindrical Rotating Body 9 Rotating Shaft Body 10 Arm Cutter 11 Cutter Head 13 First Drive Motor 15 Second Drive Motor 51 Cutter Head 52 Face Plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Itonaga 5-3-3, Nishikujo 5-chome, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd.

Claims (3)

[Claims] 1. A cylindrical rotating body having a horizontal through hole formed at an eccentric position is rotatably provided in a front portion of a shield body, and a rotating shaft body is rotatably disposed in the through hole. A cutter head formed by radially projecting three arm cutters at equal angles is attached to the front end of the rotary shaft, and the rotary shaft is rotated at the rear of the tubular rotary body. A rotary drive device is provided, and a second rotary drive device is provided on the shield body side to rotate the cylindrical rotary body in a direction opposite to the rotation direction of the rotary shaft body and at a triple speed. And a shield machine. 2. The cylindrical rotary member according to claim 1, the rotary shaft member rotatably supported by the cylindrical rotary member, and the front end portion of the rotary shaft member. A plurality of sets of cutter head mechanisms each including a cutter head having three arm-shaped cutters, a first rotary drive device that rotates the rotary shaft body, and a second rotary drive device that rotates the tubular rotary body are provided. A shield machine with the feature. 3. The shield machine according to claim 1 or 2, wherein a cutter head having a face plate of a substantially equilateral triangle shape is provided in place of the cutter head composed of three arm-shaped cutters. A shield machine with the feature.