JPH0345196B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a stirring blade in a shield tunneling machine.

Conventional configuration and problems thereof Normally, a stirring blade is provided in a pressure chamber formed in the cutter head of a slurry type shield excavator to stir the earth and sand taken into the pressure chamber. By the way, in the past, this stirring blade was fixed to the cutter head, which had the disadvantage that a sufficient stirring effect could not be obtained.

OBJECTS OF THE INVENTION An object of the present invention is to provide a stirring blade for a shield tunneling machine that can eliminate the above-mentioned conventional drawbacks.

Composition of the Invention In order to achieve the above object, the stirring blade in the shield tunneling machine of the present invention is provided such that the stirring blade body is placed in an appropriate position in the pressure chamber of the cutter head, which is rotatably provided in the front part of the shield body, and the stirring blade body is placed at the center of the rotation axis of the cutter head. The height of the blade base body is gradually decreased from the front end to the rear end. swing in the direction of
It effectively stirs the earth and sand, and the blade body is swung around an inclined axis, and the outer periphery of the blade body is also inclined, so the rotational speed at the outer periphery of the blade body changes. This makes stirring even more effective, and since the outer periphery is sloped,
Embodiment and operation in which conveyance of excavated earth and sand also occurs An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. Reference numeral 1 denotes a slurry type shield excavator, in which a cutter head 4 having a pressure chamber 3 for taking in earth and sand is rotatably supported at the front part of its seal body 2 via a swing bearing 5. 4 is operatively connected to an electric motor 7 via a ring gear 6 attached to its rear cylindrical portion 4a. Reference numeral 8 denotes a screw conveyor-type earth removal device for discharging the earth and sand in the pressure chamber 3 to the atmospheric pressure chamber 9 side, and the front end of the cylindrical casing 8a is connected to the outer pressure chamber rear partition wall 10 supported on the shield body 2 side. The opening is connected to the bottom of the center. First stirring blades 11 according to the present invention are installed at a plurality of appropriate locations in the pressure chamber 3 and are taken into the pressure chamber 3 to effectively stir the earth, sand and slurry.
is provided. That is, at a predetermined position on the inner circumferential edge of the pressure chamber 3 of the cutter head 4, the plow-shaped first stirring blade body 12 is connected to the face plate 4b and the cutter head 4 side via the shaft portions 12a, 12b protruding from both ends thereof. A front boss body 13A and a rear boss body 13 provided on the inner pressure chamber rear partition wall 4c, respectively.
It is swingably supported by B. and,
If the first blade body 12 is within a predetermined angle range (for example, 90°
Each shaft portion 12
A, 12b are provided with a pair of protrusions 14A, 14B (shown in FIG. 5), and boss bodies 13A,
13B is provided with a pair of stoppers 1 for preventing the protrusions 14A and 14B from swinging outside the predetermined angular range.
5A and 15B are provided. In addition, the first
The swing axis a of the blade body 12 is inclined so as to widen in front with respect to the rotation axis b of the cutter head 4. That is, the front boss body 13A is the rear boss body 1.
It is provided on the outer periphery from 3B. In addition, the first blade body 12 is composed of a single iron plate, and its height h gradually decreases from the front end to the rear end in order to send even a small amount of earth and sand to the rear earth removal device 8 side. Furthermore, the connection position of the cylindrical casing 8a of the earth removal device 8 is set to each first stirring blade 11.
It corresponds to the route that the person travels. 16 is a second stirring blade placed in the center of the pressure chamber 3;
It is arranged to rotate in conjunction with the rotation of the cutter head 4. That is, the second stirring blades 16 touch the face plate 4 at positions slightly apart from each other from the rotation axis b.
a pair of rotating shaft bodies 17A, 17B rotatably supported across the rear partition wall 4c of the inner pressure chamber;
A plurality of rod-shaped second blade bodies are attached radially to the pair of rotating shaft bodies 17A, 17B at front and rear positions and at 120° intervals (not limited to 120° intervals, for example, 90° intervals may be used). 18 and
The first gear 19 is attached to the rear end of each rotating shaft body 17A, 17B through which the rear partition wall 4c of the inner pressure chamber is inserted.
and a fixing member 20 fixed to the shield main body 2 side.
Moreover, the second gear 2 is mounted at the rotation axis b position and meshed with the first gears 19, 19.
It is composed of 1. In addition, in Figure 1, 22
is the hole 21 provided at the center of the second gear 21
A slurry inlet pipe is inserted through a, and its front end is connected to the rear partition wall 4c of the inner pressure chamber, and its rear end is inserted through the fixing member 20, and the slurry is introduced through the rotary joint 23. Injection tube 24
is connected.

Next, the effect will be explained.

When the cutter head 4 is rotated by the electric motor 7, the first blade body 12 moves along the circumferential direction and swings within a predetermined angular range in a direction opposite to the rotational direction, thereby removing dirt and sand in the pressure chamber 3. Effectively stirs the slurry. Also, when the cutter head 4 rotates,
Since the first gear 19 revolves around the second gear 21 fixed to the shield main body 2 side, each rotating shaft body 1
7A, 17B, that is, the second blade body 18 rotates,
Furthermore, the earth and sand are effectively stirred. In addition,
Since the height of the first blade body 12 is inclined, the mud and the mud that have been effectively stirred with the slurry are efficiently sent to the soil removal device 8, and the soil and sand are efficiently sent to the soil removal device 8 by the soil removal device 8 to the atmospheric pressure chamber 9 side. is discharged. Of course, even when the cutter head 4 rotates in the opposite direction to that described above, the first blade body 12 similarly swings in the opposite direction.
Effective stirring is possible no matter which direction the cutter head 4 rotates.

By the way, in the above embodiment, the first blade body 12 is made of a single iron plate, but as shown in FIGS. 7 to 9, for example, the first blade body 12 can be made of a pipe in the same shape. Good too.

Effects of the Invention According to the above configuration of the present invention, the plow-shaped blade root body is swingably supported within a predetermined angle range in the appropriate position in the pressure chamber of the cutter head. It is possible to improve the plastic fluidization of the soil by effectively stirring the soil.Furthermore, since the impeller body is swung around an inclined axis and the outer peripheral edge of the impeller body is also inclined, the impeller body The rotational speed at the outer periphery of the excavated soil changes to make stirring even more effective, and since the outer periphery is inclined, the excavated soil can be immediately and effectively conveyed to the rear earth removal device.

[Brief explanation of drawings]

1 to 6 show one embodiment of the present invention, in which FIG. 1 is an overall vertical sectional view, FIG. 2 is a side view of the first stirring blade, and FIG. 3 is an arrow indicated by the - arrow in FIG. Fig. 4 is a view in the - arrow direction of Fig. 2, Fig. 5 is an enlarged view in the - arrow direction of Fig. 2, Fig. 6 is a - arrow view of Fig. 1, and Figs. 7 to 9. 7 shows a modification of the first stirring blade, FIG. 7 is a side view, FIG. 8 is a view taken along the - arrow in FIG. 7, and FIG. 9 is a view taken along the - arrow in FIG. 7. 1... Shield excavator, 2... Shield body,
3... Pressure chamber, 4... Cut head, 4b... Face plate, 4c... Inner pressure chamber rear bulkhead, 8... Earth removal device, 8a... Cylindrical casing, 10... Outer pressure chamber rear bulkhead, 11... ...First stirring blade, 12...First blade body, 12a, 12b...Shaft portion, 13A,
13B...Boss body, 14A, 14B...Protrusion, 1
5A, 15B...stopper.

Claims (1)

[Claims] 1. A stirring blade body is supported in an appropriate position in the pressure chamber of the cutter head rotatably provided in the front part of the shield body so as to be swingable around an axis inclined with respect to the rotational axis of the cutter head, and this blade body is A stirring blade for a shield excavator, characterized in that the height of the blade is gradually decreased from the front end to the rear end.