JP3119824B2 - Catus spoke swinging mechanism of 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 cutter spoke swinging mechanism for a shield machine.

[0002]

2. Description of the Related Art FIGS. 1 and 2 are drawings showing an embodiment of the present invention. Among them, well-known portions will be described for better understanding of the present invention.

[0003] In the example shown in the figure, a cutter driving motor 2 is provided in front of a cylindrical skin plate 1 of a muddy water pressurized shield machine M.
Is provided with a cutter disk 10 which is rotated by. Behind the cutter disk 10, a face chamber 4 is defined by the bulkhead 3. The face chamber 4 has a water supply pipe 5 for supplying pressurized muddy water, a muddy pipe 6 for discharging drilling waste and muddy water. Is communicated. In the rear of the skin plate 1, an erector 7 for assembling the segment S is provided.
The other ends of a plurality of shield jacks 8 each having one end attached to the bulkhead 3 side are attached to the erector 7. A tail seal 9 is provided on the rear edge of the skin plate 1.

The main body 11 of the cutter disk 10 and the annular drive case 12 are provided with a plurality (4 in the illustrated example).
) Of cutout spokes 20 are provided radially.
A part of the outer periphery of the cut spokes 20 is exposed from the cutter disc 10, and the exposed part includes:
A plurality of pairs of tool bits 13a and 13b are provided in a row so as to face each other. In the figure, reference numeral 14 denotes a leading bit, and 15 denotes a gauge bit.

In such a configuration, the cutter disk 10 is rotated to excavate the face face while the face face chamber 4 is pressurized with muddy water from the water supply pipe 5, and the shield jack 8 is brought into contact with the existing segment S to extend the face. Then, the shield machine M is advanced, and the excavation waste and muddy water are discharged to the outside from the drainage pipe 6.
After excavating for a predetermined distance, the shield jack 8 is contracted, the segment S is assembled in the rear space by the erector 7, and the primary lining is performed, and the secondary lining is performed between the segment S and the drilled hole with the segment or the like. Then, the shield jack 8 is extended and brought into contact with the segment S to perform the above-described excavation.

FIG. 6 shows a conventional cutter spoke 30 and tool bits 31a and 31b.

[0007] The tool bits 31a and 31b are worn out during long-distance construction. Therefore, the following countermeasures have conventionally been taken. (1) Change the material of the tool bit to one with high wear resistance. (2) Rotate the cutter spokes and use spare bits. (3) Use a height difference bit. (4) The leading bit 14 is increased in size. (5) In order to prevent wear on the back surface of the bit, a ratchet bit that allows the bit to escape when a force is applied to the back surface is adopted.

[0008]

In FIG. 6, the symbol R
Is the rotation direction of the cutter disk, that is, the tool bit 3
In the moving directions of 1a and 31b, the tool bit 31a precedes and the tool bit 31b follows. The symbol F is the direction of excavation, and f is the excavation distance at a certain time. In the figure, when the following bit 31b passes after the preceding bit 31a passes, the preceding bit 31a advances by a distance f from the cut surface SA. That is, cut into the ground G. Therefore, the trailing bit 31b is worn by the pressing of the ground G. The back surface B of the bit 31b
In this case, the shear is fixed in a wedge shape, and the cutter torque increases.
As a result, long-distance construction becomes difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cutter spoke swinging mechanism for a shield machine which prevents wear of a tool bit and an increase in cutter torque.

[0010]

According to the present invention, a cutter disk (10) rotated by a cutter drive motor (2).
A plurality of cutter spokes (20) are radially provided on the body (11) and the drive case (12) of the cutter disk (10), and the cutter spokes (2) are provided.
A part of the outer periphery of 0) is exposed from the cutter disk (10), and a plurality of pairs of tool bits (13a, 13b) project from the exposed portion in a row with the back surfaces facing each other. In the cut-spoke swing mechanism of the shield machine,
A lever (26) extending into the drive case (12) protrudes from the cutter spoke (20).
At the end of (6), a connecting fitting (27) is rotatably supported, and both sides of the connecting fitting (27) and the drive case (1).
Swing jacks (29a, 29b) are interposed between the bracket and the bracket (28) provided in 2).

In the present invention constructed as described above, the rocking jack on the trailing bit is extended to rotate the cutter spoke, and the trailing bit is pivoted to the side opposite to the moving direction, so that the trailing bit is rotated. The tip is retracted relatively to the excavation direction from the tip of the preceding bit. Therefore, the pressing force of the ground and the force of the wedge-shaped shear do not act on the succeeding bit.

[0012]

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

Referring to FIGS. 1 to 5, an end piece 2 is provided at the center of
1 is fixedly mounted and rotatably supported on the main body 11 by a bearing 23. A prism 22 is formed at the end of the end piece 21, and stoppers 24, 24 for projecting the prism 22 at a swing angle θ in both directions of rotation are projected from the main body 11. The stopper 24 is provided with limit switches 25a and 25b for detecting that the stopper is locked.

A lever 26 extending into the drive case 12 is protruded from the cut spoke 20. At the end of the lever 26, a connection fitting 27 is rotatably supported, and both sides of the connection fitting 27 and the drive case 1
Swing jacks 29a and 29b are interposed between the brackets 28 and 28 provided in the bracket 2, respectively. The jacks 29a and 29b are of a type that extends only when the pressurized oil is supplied.

Next, the operation will be described mainly with reference to FIG.

When the cutter disc 10 is rotated in the direction of arrow R, that is, when the tool bit 13a precedes and the tool bit 13b becomes the following bit, the swing jack 2
9b, the cut-spoke 20 is turned counterclockwise in the figure by the swing angle θ, and the bit 13b is turned into the bit 13
The height H is lowered relative to a. When this is detected by the limit switch 25b, excavation is started. In addition,
The height H is larger than the distance f (FIG. 6) (for example, 40 m).
m) is taken.

When the following bit 13b passes during excavation, the preceding bit 13a moves in a space separated by a height H from the cut surface SA. Therefore, as in the related art, wear caused by pressing due to the following bit 13b protruding to the ground G and increase in cutter torque due to wedge-shaped slippage are prevented. In this case, since the reaction force applied to the preceding bit 13a acts on the swinging jack 29b on the extension side, there is no need to supply pressure oil to the jack 29b. When the cutter disc 10 is rotated in the direction R in the opposite direction, the swing jack 29
a, the lever 26 is rotated clockwise to lower the following bit 13a by the height H relative to the preceding bit 13b.

Since the stopper 24 is provided at the center of the spoke, it does not rotate excessively.

[0019]

As described above, the present invention is configured as described above, so that the life of the cutter bit can be extended and excavation over a long distance can be performed.

It is possible to suppress an increase in the cutter torque and to smoothly cut the bit.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a shield machine provided with an embodiment of the present invention.

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a sectional view taken along the line AA of FIG. 1;

FIG. 4 is a sectional view taken along the line BB of FIG. 1;

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a side view of preceding and succeeding bits for explaining a conventional problem.

[Explanation of symbols]

 B: Back side of tool bit G: Ground H: Height M: Shield machine S: Segment SA: Surface cut by preceding bit θ: Swing angle 1.・ ・ Skin plate 2 ・ ・ ・ Cutter drive motor 3 ・ ・ ・ Bulkhead 4 ・ ・ ・ Face face room 5 ・ ・ ・ Water pipe 6 ・ ・ ・ Drain pipe 7 ・ ・ ・ Electa 8 ・ ・ ・ Shield jack 9 ・ ・・ Tail seal 10 ・ ・ ・ Cutter disk 11 ・ ・ ・ Main body 12 ・ ・ ・ Drive case 13,31 ・ ・ ・ Tool bit 14 ・ ・ ・ Previous bit 15 ・ ・ ・ Gauge bit 20,30 ・ ・ ・ Cutter spoke 21 ・··· End piece 22 ··· Square prism part 23 ··· Bearing 24 ··· Stopper 25a / 25b ··· Limit switch 26 ···· Lever 27 ··· Connection bracket 28 ··· Bracket 29a / 29b Rocking jack

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuya Sasaki 1-3-8 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. Tokyo Branch (72) Inventor Muneo Yoshimura 1 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inside the Kashima Construction Co., Ltd. (72) Inventor Tsutomu Imagawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. No. 19-1 Kashima Construction Co., Ltd. Technical Research Institute (56) Reference Japanese Utility Model 3-50689 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 9/08

Claims (1)

(57) [Claims] 1. A cutter disk (10) rotated by a cutter drive motor (2), and the cutter disk (1) is provided.
A plurality of cut-spokes (20) are radially provided on the main body (11) and the drive case (12) of (0), and a part of the outer periphery of the cut-spoke (20) is exposed from the cutter disk (10). A plurality of tool bits (13a, 13b) are projected on the exposed portion in a row with the back faced in a row. A lever (26) extending into the case (12) is protruded, and a connecting metal (27) is rotatably supported at an end of the lever (26). Both ends of the connecting metal (27) and the drive case ( Bracket (28) provided on 12)
A swinging jack (29a, 29b) is interposed between the swinging mechanism and the cut-spoke swinging mechanism of the shield machine.