JP3121162B2 - 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.

[0002]

2. Description of the Related Art In a shield excavator, a cutter is attached to the tip of a cylindrical shield main body, and the ground is excavated by rotating the cutter.

In the case of excavating over a long distance by using the shield excavator, it is necessary to replace the teeth of the cutter during the excavation.

FIGS. 8 to 12 show a shield excavator in which a cutter can be exchanged. Reference numeral 1 denotes a cylindrical shield main body, and 2 denotes a cutter rotatably disposed at the tip of the shield main body 1. The size of the cutter 2 in the radial direction can be reduced by a diameter reducing device (not shown).

[0005] A front partition wall 5 and a rear partition wall 6 having circular openings 3 and 4 are provided inside the distal end of the shield body 1, and a space formed by the front partition wall 5 and the rear partition wall 6. A substantially spherical cutter reversing device main body 8 is disposed inside the opening 7 by partially fitting each of the openings 3 and 4, and the cutter reversing device main body 8 is rotatable in the front-rear direction 17. Body 1 via a horizontal shaft 9
To support.

[0006] A sealing material 10 is provided in the opening 3 of the front partition wall 5 and between the upper portion of the opening 4 of the rear partition wall 6 and the lower portion of the opening 3 of the front partition wall 5. The sealing material 11 is provided between the shield main body 1 and the cutter reversing device main body 8 and between the front partition wall 5 and a sealing wall (not shown).
A partition space 12 sealed by 0 and 11 is formed.

[0007] A cutter accommodating space 13 is formed at the front of the cutter reversing device main body 8, and a cutter access device (not shown) for accommodating the reduced-diameter cutter 2 is provided inside the cutter accommodating space 13.

Reference numeral 14 denotes a cylinder device for rotating the cutter reversing device main body 8 provided inside the shield main body 1, and 15 denotes a reversing bracket that is welded to the cutter reversing device main body 8 each time the cutter 2 is replaced. , 16
Reference numeral denotes a detachable detachable plate which constitutes a part of the cutter reversing device main body 8.

In the shield machine described above, when the ground is excavated by rotating the cutter 2 and the excavation is performed over a long distance, the teeth of the cutter 2 are worn or damaged. After the cutter 2 is reduced in diameter by the diameter device, and the cutter 2 is accommodated in the cutter accommodating space 13 by a cutter insertion / reception device (not shown), the portion of the cutter inversion device main body 8 which is located on the rear end side with respect to the sealing material 11 is used for inversion. The bracket 15 is welded, and the rod of the cylinder device 14 is connected to the reversing bracket 15 and extended, whereby the cutter reversing device main body 8 is rotated clockwise in FIG. 8 by a predetermined angle.

As shown in FIG. 9, when the cutter reversing device main body 8 is rotated by a predetermined angle, the connection between the reversing bracket 15 and the rod of the cylinder device 14 is released, and the reversing bracket 15 is cut. And the surface of the cut portion is leveled with a grinder, and then another reversing bracket 1
5 is welded to a position closer to the seal material 11 on the cutter reversing device main body 8 and thereafter the above is repeated,
As shown in FIGS. 8 to 12, the cutter reversing device main body 8 is gradually rotated.

Then, as shown in FIG. 12, when the cutter reversing device main body 8 is rotated by 90 degrees, an operator enters the partition space 12 from an entrance (not shown) and replaces the teeth of the cutter 2 with new ones. Later, in the procedure opposite to the above, the cutter reversing device main body 8 is returned to the original state, the diameter of the cutter 2 is expanded, and the excavation is restarted.

If the detachable plate 16 comes out to the rear end side with respect to the sealing material 11 with the rotation of the cutter reversing device main body 8, the detachable plate 16 hinders the rotation operation. When the removed portion is moved to the distal end side with respect to the sealing material 11, it is attached.

[0013]

However, the conventional shield machine described above has the following problems.

That is, since the double sealing materials 10 and 11 are provided in order to prevent the excavated earth and sand from entering the rear end side of the rear partition wall 6 of the shield main body 1, the cutter reversing device main body 8 is provided. The cutter reversing device main body 8 is rotated by using the cylinder device 14 while welding or cutting the reversing bracket 15 to a portion on the rear end side of the sealing material 11 so that the teeth of the cutter 2 are exchanged. Therefore, replacing the cutter 2 requires a great deal of labor and time.

The present invention has been made in view of the above circumstances, and has as its object to provide a shield excavator capable of exchanging the teeth of a cutter easily and in a short time.

[0016]

SUMMARY OF THE INVENTION According to the present invention, there is provided a cutter capable of expanding and contracting in diameter, holding the cutter in a substantially spherical cutter reversing device main body so as to be freely retractable, and inserting the cutter reversing device main body into and out of the cutter. The cutter is pivotally supported inside the shield body so as to rotate in the front-rear direction about a radial axis orthogonal to the direction, and a sealed rotation mechanism housing space surrounding the outer periphery of the shaft is formed in the shield body. The present invention relates to a shield machine in which a rotating mechanism for rotating a cutter reversing device main body is provided in a rotating mechanism housing space.

[0017]

The operation of the present invention is as follows.

The cutter is reduced in diameter and housed in a substantially spherical cutter reversing device main body, and a rotating mechanism inside a rotating mechanism housing space for sealing around a shaft is used. By rotating the cutter in the direction, the cutter is inverted, and the teeth of the cutter can be easily and quickly exchanged.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 7 show one embodiment of the present invention.
In the figure, reference numeral 18 denotes a cylindrical shield main body, 19 denotes a front-rear direction of the shield main body 18, 20 denotes a cutter disposed at a tip end of the shield main body 18, and the cutter 20 includes a rotating shaft 21 and the rotating shaft 21. Six spokes 22 protruding radially from the shaft portion 21, an outer peripheral ring 23 connecting between the tips of the spokes 22, and a protruding and retractable attachment to the tips of the spokes 22 by an expansion / contraction device 24 such as a cylinder. And the extended spokes 25 and the teeth 26 which are interchangeably attached to the spokes 22 and the extended spokes 25.

The rotary shaft 21 of the cutter 20
Is rotatably supported, and a cutter rotation unit 27 having a diameter substantially the same as that of the outer peripheral ring 23 is provided. The cutter rotation unit 27 rotates the rotation shaft 21 of the cutter via a gear 28 and a gear 29. The cutter rotating unit 2 is connected to a cutter housing space 32 formed inside a substantially spherical cutter reversing device main body 31 via a cutter access device 33 such as a cylinder.
7 is provided so as to be freely protruded and stored.

The cutter reversing device main body 31 is pivotally supported inside the shield main body 18 so that the cutter 20 rotates up and down about a radial axis 34 perpendicular to the direction in which the cutter 20 enters and exits. 18 to the shaft 34
Is provided, and a sealing member 36 for sealing between the surrounding member 35 and the cutter reversing device main body 31 is provided to form a rotation mechanism housing space 37.

Further, a pinion 38 is attached to the outer periphery of the shaft 34, and meshes with the pinion 38 so that the rotation mechanism housing space 3
7 is provided on the rear end side of the shield main body 18, and a shield main body 1 is provided on the rear end of the rack 39.
A rotation mechanism 54 that can rotate the cutter reversing device main body 31 by expansion and contraction of the rotation driving device 40 by connecting a rotation driving device 40 such as a cylinder that can expand and contract in the front-rear direction 19 of the rack 8. 39 and rotation drive device 40
Is covered with a protective casing 41 which forms a part of the rotation mechanism housing space 37.

The cutter reversing device main body 3 is located at a position before and after the surrounding member 35 inside the shield main body 18.
A front partition wall 44 and a rear partition wall 45 having openings 42, 43 into which a part of the first part 1 fits are provided.
3 are provided with sealing materials 46 and 47, and a front partition wall 44 is provided between the shield main body 18 and the cutter reversing device main body 31.
And a rear partition wall 45 to form a partition space 48.

Reference numeral 49 denotes a detachable detachable plate constituting a part of the cutter reversing device main body 31, and reference numeral 50 denotes a screw conveyor disposed through the cutter reversing device main body 31 for discharging excavated earth and sand. The screw conveyor can be divided at a halfway point and removed if necessary.

Reference numeral 51 is a shield jack, 52 is a segment, and 53 is a tail seal.

Next, the operation will be described.

By operating the motor 30, the gears 29 and 28
The cutter 20 is rotated by rotating the rotation shaft 21 supported by the cutter rotation unit 27 through the cutter 22, and the spokes 22 and the extension spokes 2 of the cutter 20 are rotated.
The ground is excavated with the fifth tooth 26.

The excavated earth and sand is carried out to the rear end side of the shield main body 18 by the screw conveyor 50. Then, as the excavation progresses, the shield body 1
8, the segment 52 is assembled, and the shield body 18 is propelled by the shield jack 51 using the segment 52 as a foothold.

The inside of the shield body 18 is sealed at the front by double sealing members 46 and 47 of front and rear partition walls 44 and 45, and at the rear by a tail seal 53.

Then, a long distance excavation is performed to
When the teeth 26 of the extension spokes 25 are worn or damaged, first, the screw conveyor 50 is divided at an intermediate part and removed to the rear end side, and as shown in FIG.
4, the extension spokes 25 are retracted into the spokes 22, and as shown in FIG. 5, the cutter rotation unit 27 together with the cutter 20 is accommodated in the cutter accommodation space 32 of the cutter reversing device main body 31 by the cutter access device 33.

After that, the rotation driving device 40 is extended to move the rack 39 toward the distal end side of the shield main body 18, and the pinion 38 meshing with the rack 39 is rotated.
The cutter reversing device main body 31 is rotated upward through the shaft 34 integral with the pinion 38, as shown in FIGS.

When the cutter reversing device main body 31 is rotated by a required angle, a worker enters a partition space 48 from an entrance (not shown).
The teeth 26 of the spokes 22 and the extension spokes 25 entering the interior
Exchange.

After the teeth 26 of the spokes 22 and the extension spokes 25 have been exchanged in this manner, the cutter 20 is returned to the tip of the shield body 18 by performing the reverse procedure.
Resume drilling.

As described above, the sealed rotating mechanism housing space 37 is formed around the shaft 34 which is the center of rotation of the cutter reversing device main body 31, and the pinion 3 is provided inside the housing space 37.
8, a rotation mechanism 5 such as a rack 39 and a rotation drive device 40
4, the cutter reversing device main body 31 is provided.
Can be easily rotated to exchange the teeth 26 of the spokes 22 and the extension spokes 25 in a short time.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the spirit of the present invention.

[0037]

As described above, according to the shield machine of the present invention, an excellent effect that the teeth of the cutter can be replaced easily and in a short time can be obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of one embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a front view of the cutter in FIG. 1;

FIG. 4 is an operation diagram showing a state where the diameter of the cutter is reduced.

FIG. 5 is an operation diagram showing a state in which the cutter is housed in the cutter housing device main body.

FIG. 6 is an operation diagram showing a state where the cutter housing device main body is rotated.

FIG. 7 is an operation diagram following FIG. 6;

FIG. 8 is a side sectional view of a conventional example.

9 is an operation diagram showing a state in which the cutter housing device main body in FIG. 8 is rotated.

FIG. 10 is an operation diagram following FIG. 9;

FIG. 11 is an operation diagram following FIG. 10;

FIG. 12 is an operation diagram following FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 18 Shield body 19 Front-back direction 20 Cutter 31 Cutter reversing device main body 34 Axis 37 Rotation mechanism accommodation space 54 Rotation mechanism

Continuing on the front page (72) Inventor Hiroyuki Ito 111-1 Kitahama-cho, Chita-shi, Aichi Prefecture Ishikawajima-Hari Ma Heavy Industries Co., Ltd. Aichi Factory (72) Inventor Kaoru Kaneko 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Inside Taisei Corporation (72) Inventor Kenichi Kaneko 1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Taisei Corporation (72) Inventor Yoshihiro Uchiyama 1-1-1 Wadazaki-cho, Hyogo-ku, Kobe City, Hyogo Prefecture No. 1 Mitsubishi Heavy Industries, Ltd., Kobe Shipyard (72) Inventor Toshifumi Inoue 1-1, Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Pref. Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (58) Cl. ⁷ , DB name) E21D 9/08 E21D 9/06 301

Claims (1)

(57) [Claims] 1. A cutter capable of expanding and contracting a diameter is provided, and the cutter is held in a substantially spherical cutter reversing device main body so as to protrude and be housed therein. The cutter body is pivotally supported inside the shield body so as to rotate in the front-rear direction, and a sealed rotation mechanism housing space surrounding the outer circumference of the shaft is formed in the shield body, and the cutter reversing device is provided in the rotation mechanism housing space. A shield machine comprising a rotation mechanism for rotating a main body.