JP3740602B2 - Shield excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield excavator having a configuration in which a chamber for mixing excavated earth and sand is provided behind a cutter device.
[0002]
[Prior art]
As is well known, in earth pressure type shield excavators and eccentric multi-axis shield excavators, a rear space of the cutter device is partitioned by a bulkhead, and a chamber for mixing the excavated earth and sand is provided there and kneaded in the chamber. The mixed excavated soil is discharged backward by a screw conveyor or the like from a discharge port opened in the bulkhead.
[0003]
[Problems to be solved by the invention]
By the way, in this kind of shield excavator, mixing of excavated sediment in the chamber may not be performed sufficiently and efficiently, especially when excavated sediment is viscous soil. There is a case where a situation occurs in which the inner surface of the chamber adheres to the chamber or the outlet is blocked, and an effective countermeasure that can avoid such a situation is required.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention , a bulkhead is provided behind the cutter device, and a chamber for mixing the excavated sediment is provided between the cutter device and the bulkhead, and the excavated sediment is discharged backward in the bulkhead. In the shield excavator having a configuration in which the cutter device is configured to eccentrically rotate the cutter frame with respect to the skin plate, a stirring blade for mixing the excavated earth and sand in the chamber is provided on the back side of the cutter frame. A fixed wing that protrudes forward at the center position of a rotation locus drawn by the stirring blades with the eccentric rotation of the cutter frame is provided on the front side of the bulkhead , and the stirring blades pass excavated earth and sand into the discharge port. It is a plate-like form extruding towards and during the agitation拌翼is to continue to rotate toward the discharge port side Its orientation to push toward drilling sand to the discharge port is characterized in that it is set to be perpendicular to the extrusion direction.
[0008]
According to a second aspect of the present invention, in the shield excavator according to the first aspect of the present invention, a discharge pipe for discharging water or a chemical solution is provided in the chamber.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to FIGS. 5 to 7, and prior to that, reference examples related to the present invention will be described with reference to FIGS. 1 to 4. For convenience of explanation, the reference example shown in FIGS. 1 to 4 is hereinafter referred to as a first embodiment, and the original embodiment shown in FIGS. 5 to 7 is referred to as a second embodiment.
The shield excavator of the first embodiment (reference example) is an earth pressure shield excavator, in which a reference numeral 1 is a skin plate, 2 is a bulkhead that defines its tip, 3 is a cutter device, A chamber 4 is provided between the cutter device 3 and the bulkhead 2 for taking and mixing the excavated earth and sand. An excavation earth discharge port 5 is opened below the bulkhead 2, and a screw conveyor 6 is provided behind the excavation earth and sand. 6 is configured to be discharged backward.
[0010]
A stirring blade 7 protruding into the chamber 4 is provided on the back side of the cutter device 3, and the excavated sediment is stirred in the chamber 4 by the stirring blade 7 by the rotation of the cutter device 3. Mixing of excavated earth and sand in the chamber 4 can be performed more reliably and efficiently, and the excavated earth and sand can be prevented from adhering to the inner surface of the chamber 4 and can be easily removed even if adhering temporarily. Therefore, in the shield excavator of the first embodiment, the discharge pipe 8 for discharging water and various chemicals to the bulkhead 2 is provided.
[0011]
That is, discharge pipes 8 are fixed to the upper, central and lower portions of the bulkhead 2 by welding or the like, and a large number of discharge ports 9 are directed downward at predetermined intervals in the discharge pipes 8 as shown in FIGS. Alternatively, it is provided upward, and water or various chemicals can be supplied to these discharge pipes 8 from a supply source device (not shown) and discharged from each discharge port 9 like a shower.
[0012]
In the shield excavator of the first embodiment provided with the discharge pipe 8 as described above, excavation is performed while constantly discharging various chemicals such as water or a mud and an adhesion preventing material from the discharge pipe 8. Or by appropriately discharging water or chemicals as necessary, the viscosity of the excavated earth and sand taken into the chamber 4 can be appropriately adjusted, and the mixing of the excavated earth and sand in the chamber 4 can be reliably and efficiently performed. As a result, it is possible to prevent a situation in which the excavated earth and sand adheres to the inner surface of the chamber 4 or closes the discharge port 5, and the adhering and closing of the excavated earth and sand occurs temporarily. Even if it is, it can be quickly washed away with water or chemicals, and the drainage can be expelled by pushing the excavated earth and sand toward the discharge port 5 with water or chemicals discharged from the discharge pipe 8. That.
[0013]
In addition, it is possible to take appropriate measures by properly using appropriate chemicals according to the viscosity and conditions of the excavated sediment, and by appropriately adjusting the discharge pressure and discharge amount of water and chemicals, and discharge to conventional shield excavators. The cost increase is insignificant because only the tube 8 and the supply source device need be added. The installation position of the discharge pipe 8, the number of the discharge pipes 8 and the like are not limited to the above and may be changed as appropriate.
[0014]
Next, a second embodiment (original embodiment) of the present invention will be described with reference to FIGS. The shield excavator of the second embodiment is an eccentric multi-axis shield excavator, and its cutter device 10 has a ring-shaped cutter frame 11 slightly smaller in diameter than the skin plate 1 as shown in FIG. Thus, it is configured to be eccentrically rotated.
[0015]
A normal stirring blade 7 is provided on the back side of the cutter frame 11. In addition to the stirring blades 7, two plate-shaped stirring blades 12 are provided in the shield excavator of the second embodiment. It is provided on the back side of the lower part of the frame 11. These agitating blades 12 rotate by drawing a locus as shown in FIG. 7 by the eccentric rotational movement of the cutter frame 11, kneading the excavated sediment in the chamber 4 by such a rotational motion and directing the excavated sediment to the discharge port 5. To extrude. Therefore, these agitating blades 12 are set so that their directions are orthogonal to the extrusion direction so that the excavated earth and sand is efficiently pushed toward the discharge port 5 when rotating toward the discharge port 5 side.
[0016]
Corresponding to these stirring blades 12, a fixed blade 13 is provided on the front side of the bulkhead 2 so as to protrude forward at the center position of the rotation locus drawn by the stirring blade 12. The fixed wing 13 circulates around the periphery. In the eccentric multi-axis shield excavator as in the second embodiment, the eccentric rotation radius of the cutter frame 11 is not so large. Therefore, the stirring blade 12 also only rotates in a limited region. Although it is assumed that the so-called co-rotation in which the excavated earth and sand rotates together with the stirring blade 12 and the stirring is not substantially performed, the fixed blade 13 as described above is protruded to the center position of the stirring blade 12. Therefore, the excavation earth and sand can be effectively prevented from rotating together, and the agitating blade 12 and the fixed blade 13 can reliably agitate the excavation earth and sand. Moreover, since the excavated sediment is efficiently pushed out toward the discharge port 5 by the plate-like stirring blade 12 as described above, the excavated sediment can be reliably discharged and the discharge port 5 may be blocked. Can be prevented.
[0017]
In addition, it is preferable to provide said stirring blade 12 in the vicinity of the discharge port 5 like the said embodiment, and the fixed blade 13 needs to be provided in the center position of the rotation locus | trajectory of the stirring 12. In addition, the stirring blade 12 has a plate shape so that the excavated soil can be efficiently pushed out, and the excavated soil is discharged when the stirring blade 12 rotates toward the discharge port 5 as described above. Although it is necessary to set the direction to be orthogonal to the extrusion direction so as to extrude toward 5, the position, number and configuration of the agitating blades may be arbitrarily set. Of course, a discharge pipe 8 may be provided in the chamber 4 of the eccentric multi-axis shield excavator of the second embodiment as in the mud shield excavator of the first embodiment (reference example) .
[0020]
【The invention's effect】
Since the shield excavator of the invention of claim 1 is provided with a stirring blade on the back side of the cutter frame that rotates eccentrically, and a fixed blade that protrudes forward at the center position of the rotation locus drawn by the stirring blade is provided in the bulkhead. In addition, it is possible to prevent the excavated earth and sand from rotating together with the stirring blades and impair the stirring effect, and the excavated earth and sand can be reliably agitated.
[0021]
In addition, a plate-like shape that extrudes excavated earth and sand toward the outlet is adopted as the agitating blade, and when the agitating blade rotates toward the outlet, the excavated earth and sand is pushed toward the outlet. Thus, since the direction is set to be orthogonal to the extrusion direction, the effect of preventing co-rotation can be obtained, and the agitating blade can efficiently extrude the excavated sediment toward the discharge port.
[0022]
The shield excavator of the invention of claim 2 is the shield excavator of the invention of claim 1 , because the discharge pipe for discharging water or chemicals is provided in the chamber, so that the viscosity of the excavated earth and sand can be adjusted appropriately, and the excavated earth and sand Can be reliably and efficiently carried out, and adhesion of excavated soil and blockage of the discharge port can be prevented.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a schematic configuration of a shield excavator as a reference example related to the present invention .
FIG. 2 is a front view of the same.
FIG. 3 is an enlarged view of the main part of the same.
FIG. 4 is an enlarged view of the main part of the same.
FIG. 5 is a side sectional view showing a schematic configuration of a shield excavator according to an embodiment of the present invention.
FIG. 6 is a front view of the same.
FIG. 7 is an enlarged view of the main part of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Skin plate 2 Bulkhead 3 Cutter apparatus 4 Chamber 5 Discharge port 6 Screw conveyor 8 Discharge pipe 9 Discharge port 10 Cutter apparatus 11 Cutter frame 12 Stirring blade 13 Fixed blade

Claims (2)

A bulkhead is provided at the rear of the cutter device, and a chamber is provided between the cutter device and the bulkhead for mixing the excavated earth and sand, and an outlet for discharging the excavated earth and sand is opened in the bulkhead. In the shield excavator configured to eccentrically rotate the cutter frame with respect to the skin plate,
On the back side of the cutter frame is provided with a stirring blade for kneading excavated earth and sand in the chamber, and on the front side of the bulkhead, the center position of the rotation locus drawn by the stirring blade with the eccentric rotation of the cutter frame which fixed blades projecting forward in,
The stirring blade has a plate-like shape that pushes excavated earth and sand toward the discharge port , and the stirring blade pushes the excavated earth and sand toward the discharge port when rotating toward the discharge port side. The shield excavator is characterized in that its direction is set to be orthogonal to the extrusion direction . 2. The shield excavator according to claim 1 , wherein a discharge pipe for discharging water or a chemical solution is provided in the chamber.

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