JP2902288B2 - Special section shield stirrer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirring device used for stirring excavated soil of a shield having a special section.

[0002]

2. Description of the Related Art A general shield excavator will be described with reference to FIG. FIG. 5 shows a cross section of a conventional shield excavator.

At the front end of the shield machine body 1, a cutter arm 2 having a large number of cutters on its front face is rotatably supported, and the cutter arm 2 is driven and rotated by a driving device 3. The shield machine body 1 is provided with a shield jack 4, and the shield machine body 1 excavates by pressing the shield jack 4 against, for example, an existing segment (not shown).

[0004] The cutter arm 2 is provided with an injecting agent discharging device 5, and the extruding agent is discharged from the injecting agent discharging device 5 to stabilize the excavated soil. A stirring rod 6 is provided on the back of the cutter arm 2, and the chamber 7 is rotated by the rotation of the cutter arm 2.
The excavated soil inside is stirred and sufficiently kneaded. A screw conveyor 8 is provided in the shield machine main body 1, and the excavated soil in the chamber 7 is discharged by the screw conveyor 8 according to the speed of the shield jack 4.

In the shield excavator having the above-described configuration, the cutter arm 2 is rotated by the driving device 3 to perform excavation. Further, the excavated soil in the chamber 7 is stirred by the stirring rod 6, and the driving speed of the shield jack 4 (the shield machine body 1
The excavated soil in the chamber 7 is discharged in accordance with the excavation speed), and a circular tunnel is implemented.

In recent years, tunnels having a special cross section, such as a short shape, an oval shape, an oval shape, and a horseshoe shape, have come into use. A tunnel having a special cross section is used for a wide range of applications because the dimensional restrictions of the internal structure are small. When performing a tunnel with a special cross section, an extra excavation device is provided on the cutter arm 2 of the shield excavator shown in FIG. 5, and the extra excavation device is operated at a required rotation angle position in synchronization with the rotation of the cutter arm 2.
A special section tunnel will be implemented.

[0007]

By providing the cutter arm 2 of the conventional shield excavator with an extra excavation device, a tunnel having a special cross section can be implemented. However, since the stirring rod 6 is fixed to the back surface of the cutter arm 2, the rotation trajectory of the stirring rod 6 draws a circular shape, and the excavated soil at the portion excavated by the surplus equipment is not sufficiently stirred at present. It is.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a main cutter for excavating a circular shape, an injecting agent discharging device for discharging an injecting agent for stabilizing excavated soil, and a main cutter. In a special section shield excavator provided with a stirrer provided on the back side and agitating excavated soil and an excavation device for excavating an outer part of the main cutter, the excavator is provided on the main cutter so as to be able to extend outward in the excavation radial direction. The elastic material, the auxiliary stirrer provided on the back of the elastic material, the rotation position detection device that detects the rotational position of the main cutter, and the rotation position detection device detect the correspondence of the elastic material to the excavation part of the overground equipment A telescopic jack is provided to extend the stretchable material and perform agitation by the auxiliary stirrer bar when performed.

[0009]

When the rotation position detecting device detects that the main cutter rotates and the extensible member corresponds to the excavated portion of the excavation device, the extensible material is extended by the extensible jack, and the auxiliary stirrer rod is moved to the excavation device. It moves to the excavation part, and the excavated soil of this excavation part is agitated by the auxiliary stirring rod. The extension stroke and the rotational position of extension of the elastic member are set in accordance with the cross-sectional shape, and the trajectory of the sub stirrer rod is matched with various cross-sectional shapes.

[0010]

FIG. 1 is a cross-sectional view of a shield excavator equipped with a special-section shield stirrer according to one embodiment of the present invention. FIG. 2 is a view taken along the arrow II in FIG. 1, and FIG. FIG. 4 shows the state, as viewed from the direction of arrow IV in FIG.

As shown in FIG. 1, a cutter arm (main cutter) 12 having a large number of cutters on its front face is rotatably supported via a bearing device 13 at the front end of a shield machine main body 11. Is driven and rotated by the driving device 14. The drive device 14 is provided with a rotation detector 15 as a rotation position detection device, and the rotation detector 15 detects the rotation state of the cutter arm 12. The shield machine body 11 is provided with a shield jack 16, and the shield machine body 11 excavates by pressing the shield jack 16 against, for example, an existing segment (not shown). The cutter arm 12 is provided with an injecting agent discharging device 17, and the excavating agent is discharged from the injecting agent discharging device 17 to stabilize the excavated soil.

As shown in FIGS. 1 and 2, the cutter arm 1
2 are provided radially, and a stir bar 18 is attached to the back of the cutter arm 12. The excavated soil in the chamber 11 a is stirred by the stirring rod 18 by the rotation of the cutter arm 12. A swing cutter 20 is supported on one of the cutter arms 12 via a bracket 19, and the swing cutter 20 swings outward in the radial direction of the cutter arm 12 by driving a swing jack 21. By swinging the swing cutter 20 with the rotation of the cutter arm 12, an oval cross section can be excavated as shown in FIG. By appropriately setting the swing timing and swing amount of the swing cutter 20, cross sections of various shapes can be excavated, and the bracket 19 and the swing cutter 2 can be excavated.
0 and the swing jack 21 constitute an extra excavation device.

As shown in FIGS. 3 and 4, the two cutter arms 12 support an extensible member 22 which is extensible in the direction of the excavation. The extensible member 22 is extended by an extensible jack 23 having a stroke detector. You. A sub stirrer rod 24 is attached to the back of the elastic member 22, and the elastic member 22 is extended to rotate the cutter arm 12, whereby the swing cutter 20 is rotated.
The excavated part is stirred by the auxiliary stirring rod 24. The swing timing and swing amount of the swing cutter 20 and the extension time and extension amount of the elastic member 22 are set for each cross-sectional shape of the tunnel according to the detection state of the rotation detector 15.

A screw conveyor 25 is provided on the shield machine main body 11, and the stirring bar 1 is moved by the screw conveyor 25.
8 and the excavated soil in the chamber 11 a stirred by the auxiliary stirring rod 24.

In the shield excavator having the above-described configuration, the rotation detector 15 sets the origin in the rotation direction of the cutter arm 12, and at the position of the origin, the elastic member 22 is housed inside the excavation radial direction. The cutter arm 12 is rotated by the driving of the driving device 14 to perform excavation, and the excavated soil in the chamber 11a is agitated by the stirring rod 18. The rotation angle of the cutter arm 12 is the rotation detector 1
5, the swing cutter 20 swings by a predetermined amount by driving the swing jack 21 at a predetermined angular position,
Excavation is performed. When the excavation is performed, the extensible member 22 extends into the extra excavation portion by driving the extensible jack 23, and the excavated soil excavated by the swing cutter 20 is stirred by the auxiliary stirring rod 24. At this time, the swing amount of the swing cutter 20 and the extension amount of the elastic member 22 are fed back, and are synchronized with the rotation angle of the cutter arm 12. Excavation and agitation of the special section are performed according to the rotation of the cutter arm 12. Done. The screw conveyor 25 is adjusted in accordance with the driving speed of the shield jack 16, that is, the excavating speed of the shield machine body 11.
As a result, the excavated soil in the chamber 11a is discharged, and a tunnel having a special cross section is excavated.

Therefore, by extending the elastic member 22 at the surplus portion, the excavated soil at the surplus portion can be sufficiently stirred by the auxiliary stirring rod 24.

[0017]

The special section shield stirrer of the present invention has the following features.
By extending the elastic material in the surplus portion, the excavated soil in the surplus portion can be sufficiently stirred by the auxiliary stirring rod. As a result,
The face of the special cross section is stable, and the tunnel of the special cross section can be dug stably.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a shield excavator equipped with a special-section shield stirrer according to one embodiment of the present invention.

FIG. 2 is a view taken in the direction of the arrow II in FIG.

FIG. 3 is a detailed explanatory view of an elastic member.

FIG. 4 is a view as viewed from an arrow IV in FIG.

FIG. 5 is a cross-sectional view of a conventional shield excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Shield machine main body 12 Cutter arm 13 Bearing device 14 Drive device 15 Rotation detector 16 Shield jack 17 Injectant discharge port 18 Stirrer bar 19 Bracket 20 Swing cutter 21 Swing jack 22 Elastic material 23 Telescopic jack 24 Secondary stirrer 25 Screw conveyor

──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 000219875 Tokyu Construction Co., Ltd. 1-16-14 Shibuya, Shibuya-ku, Tokyo (73) Patent holder 000006655 Nippon Steel Corporation 2-chome Otemachi, Chiyoda-ku, Tokyo No. 6-3 (73) Patent holder 000150110 Takenaka Civil Engineering Co., Ltd. 8-21-1, Ginza, Chuo-ku, Tokyo (72) Inventor Takao Matsumoto 1-1-1, Wadazakicho, Hyogo-ku, Hyogo-ku, Kobe City, Hyogo Prefecture Mitsubishi Heavy Industries Kobe Shipyard Co., Ltd. (72) Inventor Miya Kiyoshi 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Toshimi Ino 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Large (72) Inventor Koji Yoshida 2-3-3 Kanda Surugadai, Chiyoda-ku, Tokyo 11 Konoike Gumi Co., Ltd. (72) Inventor Yuji Asakami Shibuya, Tokyo 1-16-14 Shibuya-ku, Tokyu Construction Co., Ltd. (72) Inventor ▲ Minoru Tada 2-6-3 Otemachi, Chiyoda-ku, Tokyo Nippon Steel Corporation (72) Inventor Yoshifumi Fujii Tokyo 8-21-1, Ginza, Chuo-ku, Tokyo Takenaka Civil Engineering Co., Ltd. (56) References JP-A-6-137064 (JP, A) JP-A-63-83399 (JP, A) (58) Fields surveyed (Int .Cl. ⁶ , DB name) E21D 9/06 301 E21D 9/08

Claims (1)

(57) [Claims] 1. A main cutter for excavating a circular shape, an injection device for discharging an injection for stabilizing excavated soil, a stir bar provided on a back portion of the main cutter for stirring the excavated soil, and a main cutter. In a special cross-section shield excavator equipped with an extra excavation device for excavating the outer portion of the excavator, an extensible member provided on the main cutter so as to be able to extend outward in the excavation radial direction, and a sub-stirring bar provided on a back portion of the extensible member, A rotation position detection device that detects the rotation position of the main cutter, and when the rotation position detection device detects the correspondence of the extensible member to the excavated portion of the overmining device, the expandable member is extended and stirring is performed by the auxiliary stirring rod. Special section shield stirrer, characterized by having a telescopic jack to make it work.