JP3161804B2 - Shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine equipped with a rotary cutter.

[0002]

2. Description of the Related Art Conventionally, a shield machine for excavating a tunnel is provided with a cutter head rotated by a cutter head motor at a front portion of a shield body, and a cutter bit for excavating a face is provided on a front surface of the cutter head. Installed. A conventional cutter bit a has spokes c radially provided on a front surface of a cutter head b as shown in FIG.
And is configured to excavate a face with rotation of the cutter head b, and the excavated earth and sand is taken into the cutter head b from the earth and sand intake port d.

[0003]

In the conventional shield machine described above, the number of the cutter bits a on the central portion side of the cutter head b is smaller than the number of the cutter bits a on the outer peripheral side due to space limitations. It is necessary to make the cutter bit a larger than the cutter bit a on the outer peripheral side, so that the durability is reduced, and in particular, in a shield drilling machine having a large diameter, the rotational speed of the shield body is small. Has to be further increased, and the cutter bit a on the inner peripheral side is worn out early. In addition, since the sediment intake port d is smaller on the central portion side than on the outer peripheral side, the sediment intake amount is reduced. The present invention has been made in order to improve the above-described disadvantages, and provides a shield machine equipped with a rotary cutter that rotates on a central portion side of a cutter head to improve the durability and excavation efficiency of the cutter. It is the purpose.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and an invention according to claim 1 is a cutter head rotatably provided at a front portion of a shield body. In the shield machine where a number of cutter bits are attached in the radial direction to the front surface of the cutter head, an opening is provided near the center of the front surface of the cutter head, and the opening is opposite to the direction in which the cutter head rolls by rotation of the cutter head. The rotary cutter provided in the direction is rotated by a cutter motor.

As described above, by providing the rotary cutter which rotates in the direction opposite to the rolling direction due to the rotation of the cutter, the earth and sand are actively scraped into the opening while excavating the vicinity of the center of the cutter head with a large number of bits. Thus, the amount of sediment taken in and the amount of wear of the bit can be balanced between the vicinity of the inner circumference and the vicinity of the outer circumference of the cutter head.

In order to achieve the above object, a second aspect of the present invention is the invention according to the first aspect, wherein a plurality of the rotary cutters are arranged on the left and right sides of the center of the cutter head, and When viewed from the front, these rotary cutters provided on the left and right rotate in directions opposite to each other.

Since the rotary cutters are arranged on the left and right as described above, the balance at the time of excavation is good.

In order to achieve the above object, a third aspect of the present invention is the invention according to the second aspect, wherein the plurality of rotary cutters arranged on the right and left sides of the center of the cutter head are provided. The head is eccentric so as to be asymmetrical on the left and right sides of the head.

The eccentric mounting of the rotary cutter makes it possible to dispose the rotary cutter up to the center of the cutter head.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. FIG. 2 is a cross-sectional view of the shield machine, and FIG. 3 is a front view thereof. In these figures, reference numeral 1 denotes a shield body, which is propelled into the ground by a shield jack 2. 3 is the above shield body 1
Is rotated by a cutter head motor 4 with a cutter head provided in a front portion of the cutter head. The cutter head 3 has a rectangular opening 3a in the center of the front surface and a plurality of spokes 3b provided in the periphery thereof in the radial direction. Tool bits 5 are provided on both side edges of each spoke 3b.
A large number of leading bits 6 are attached to the opening edge of the earth and sand intake port 3c opened on both sides of the spoke 3b at intervals in the radial direction.

On the other hand, two rotary cutters 7, which are rotated in opposite directions, are provided on the same axis in the central opening 3a. The rotary cutter 7 is a cutter body 7a.
Are formed in a tubular shape, and shafts 7b are protrudingly provided on both end surfaces. The shafts 7b adjacent to each other are supported by bearings 8. As shown in FIG. 4, the bearing 8 is installed at the tip of a central shaft 9 provided at the center of the cutter head 3 so as to be eccentric with respect to the center of the central shaft 9. Accordingly, each of the rotary cutters 7 revolves with respect to the center shaft 9, and the other end of the shaft 7 b is
The cutter motor 3 is protruded into the cutter head 3 through both end surfaces of the opening 3a, and is connected to two cutter motors 10 provided in the cutter head 3 so that the cutter motors 10 rotate in opposite directions. It has become.

On the outer peripheral surface of the cutter body 7a, a plurality of cutters 7d having cutter bits 7c on both sides of the tip end so that the cutter body 7a can be excavated in any direction as shown in FIG. Projected in the radial direction.

Next, the operation of the shield machine described above will be described. As the shield body 1 is propelled into the ground by the shield jack 2, the cutter head motor 4 is driven.
, The cutter head 3 is rotated, and the tool bit 5 and the preceding bit 6 provided on the front surface of the cutter head 3 excavate the face. At the same time, the two rotary cutters 7 are rotated in the opposite directions by the cutter motor 10, and the cutter 7d protruding from the outer peripheral surface of the cutter body 7a excavates the face, so that the inner peripheral side of the cutter head 3 rotates. The rotary cutter 7 revolves while rotating, and the outer peripheral side is a tool cutter 5
And it becomes possible to excavate by the leading cutter 6. The earth and sand excavated by the tool cutter 5 and the leading cutter 6 is fed from the earth and sand intake port 3c opened on both sides of the spoke 3d.
After being taken into the cutter head 3 from a, it is slurried by the muddy water injected by the mud feeding pipe 12, and further discharged from the inside of the cutter head 3 to the rear of the shield main body 1 by the mud discharging pipe 13. In the figure, reference numeral 14 denotes an agitator provided in the vicinity of the suction port of the exhaust pipe 13, which has a function of stirring the earth and sand sucked into the exhaust pipe 13 to prevent the exhaust pipe 13 from being blocked by the earth and sand. Have.

On the other hand, while the shield body 1 is being dug, the two rotary cutters 7 are rotated in opposite directions by the cutter motor 10, so that the earth and sand take-in directions are the same as the rotation direction of the cutter head 3. Excavation is possible without disturbing the ground, and the cutter motor 10
By increasing or decreasing the rotational speed of the rotary cutter 7, the tool bit 5 and the leading bit 6 for excavating the outer peripheral side are formed.
Excavation balanced with the amount of excavation is possible. In addition, since the centers of the rotary cutters 7 are eccentric from the center of the cutter head 3 in advance, it is possible to excavate to the center of the cutter head 3.

In the above embodiment, one end of the shaft 7b is supported by the bearing 8 provided at the eccentric position of the center shaft 9.
When the bevel gear 16 is fixed to one end of the shaft 7b and the bevel gear 16 is meshed with a bevel gear 17 provided at an eccentric position of the center shaft 9, one rotary cutter 7 is rotated by the cutter motor 10. Thus, both rotary cutters 7 can be driven to rotate in opposite directions, so that one cutter motor 10 can be used. As shown in FIG. 7, a bevel gear 20 is provided on a drive shaft 19 which is rotated by a cutter motor 10 in a center shaft 9, and this bevel gear 20 meshes with a bevel gear 21 fixed to the shaft 7 b of each rotary cutter 7. By doing so, both rotary cutters 7 can be driven to rotate in opposite directions by one cutter motor 10 provided in the shield body 1.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a cutter head of a conventional shield machine.

FIG. 2 is a sectional view of a shield machine according to an embodiment of the present invention.

FIG. 3 is a front view of a shield machine according to an embodiment of the present invention.

FIG. 4 is an enlarged sectional view taken along line XX of FIG. 3;

FIG. 5 is an enlarged sectional view taken along line YY of FIG. 3;

FIG. 6 is an explanatory view showing another embodiment of a rotary cutter portion.

FIG. 7 is an explanatory view showing another embodiment of a rotary cutter portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield body 3 Cutter head 3a Opening 7 Rotary cutter 10 Cutter motor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-122195 (JP, U) JP-A-3-5799 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E21D 9/08

Claims (3)

(57) [Claims] 1. A shield machine in which a plurality of cutter bits are mounted in a radial direction on a front surface of a cutter head (3) rotatably provided at a front portion of a shield body (1 ). An opening (3a) is provided near the center of the front surface of the cutter, and the opening (3a) is used to rotate the cutter head (3).
Therefore, the cutter motor rotates in the direction opposite to the rolling direction.
A shield machine equipped with a rotary cutter (7) that is rotated . Wherein said rotary cutter (7) cutter head
Place multiple pieces on the left and right across the center of (3), and
When viewed from the front, the cutter heads provided on these left and right (7)
2. A shield machine according to claim 1, wherein said shield excavators rotate in opposite directions. Wherein said plurality of rotary cutter which is disposed on the left and right across the center of the cutter head (3) (7), the cutter
The shield machine according to claim 2, wherein the shield excavator is preliminarily eccentric so as to be asymmetrical on the left and right sides of the head .