JP2001355386A - Copy cutter device for shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently conduct the extension works of the cross section of a tunnel in tunnel excavation by a shield machine. SOLUTION: A cutter frame 15 is built along the peripheral direction of the outer periphery of a cutter head 2 among hydraulic cylinder jacks 11 installed into the cutter spokes 3 of the cutter head 2 for the shield machine 1 and the adjacent cutter spokes 3. One end of the cutter frame 15 is connected at the front end of the hydraulic cylinder jack 11 in the cutter spoke 3, and the other end is supported rotatably at the position of another adjacent cutter spoke. A part of the cutter frame 15 is pushed out to the outside from the outer periphery of the cutter head 2 by the cylinder extension operation of the hydraulic cylinder jack 11, and a ground in the periphery of the tunnel is cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copy cutter device for a shield excavator, and more particularly to a copy of a shield excavator excellent in structure and durability capable of easily widening a tunnel section by taking a wide cut surface. It relates to a cutter device.

[0002]

2. Description of the Related Art Recently, shield tunnels are becoming deeper because congestion of underground structures and the establishment of a method for utilizing deep underground are expected. Further, in urban areas, with the increase in depth, it has become difficult to increase construction costs for shaft construction and secure land for shafts. In addition, there is an increasing need for long-distance shield tunnels, such as the construction of shield tunnels under the sea floor. For this reason, it is necessary to excavate a section other than the standard tunnel section using a conventional shield excavator, such as a change in the tunnel section due to the alignment and the construction of a sharp curve.
For this reason, various copy cutter devices have been developed which can perform predetermined excavation on the outer periphery of the tunnel.

FIG. 9 is a schematic perspective view showing a cutter head 51 of a conventional shield excavator 50 and a part of a copy cutter device 52 mounted on a peripheral surface of the cutter head. The copy cutter device 50 is an additional excavation device that performs extra excavation in the radial direction of the tunnel cross section in response to excavation in the tunnel face direction due to rotation of the cutter head 51. The copy cutter device 52 normally extends the cylinder of the copy cutter jack (not shown) housed in the cut-spoke 53 to extend the cutter portion 55 from the skin plate outer peripheral surface 54 of the shield excavator 50 by a predetermined amount. The protruding portion is dug in the circumferential direction of the tunnel section. Also, by adjusting the amount of protrusion of the cutter portion 55,
The width of the tunnel and the width of the tunnel are appropriately set.

[0004]

However, as described above, a problem with the equipment of the shield excavator accompanying the enlargement of the cross section and the length of the shield tunnel is wear of the cutter bit. The cutter bit mounted along the cutter spokes has a longer cutting length as the mounting position is closer to the outer periphery, so that the wear is greater. Therefore, the wear of the cutter bit mounted on the copy cutter device is maximized, but it is difficult to replace the cutter bit of the conventional copy cutter device, and a bit arrangement that further increases the durability of the cutter bit is required. .

[0005] Further, in the case of railway tunnels and shield tunnels for roads, the number of works that involve a partial widening of the tunnel section is increasing. As for the shield tunnel widening method, after building the shield tunnel, remove the necessary secondary lining of the widened part,
A widening method of excavating and widening the ground around the tunnel over a predetermined range and lining the area with a special shape has also been put to practical use. However, additional costs such as ground improvement are required.

However, in the conventional copy cutter device as shown in FIG. 9, when the enlargement ratio from the standard portion to the wide portion becomes large due to a small diameter or the like, the protruding cutter portion becomes structurally cantilevered. If the resistance at the time of cutting is large, the protruding portion may be deformed, so that there is also a problem that the amount of widening in the circumferential direction cannot be large.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to secure a large widening amount in the circumferential direction of the tunnel cross section which is structurally superior and can withstand long-term use. An object of the present invention is to provide a copy cutter device of a shield excavator.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a drive mechanism mounted in a cutter spoke of a cutter head of a shield excavator, and the cutter head is provided between adjacent cutter spokes. A cutter frame that is installed along the circumferential direction of the outer peripheral edge, one end of which is connected to the driving means in the cut-spoke, and the other end is rotatably supported at another cut-spoke position adjacent to the cut-spoke. A part of the cutter frame protrudes outward from the outer peripheral edge by the operation of the driving means to cut the ground around the tunnel.

In the cutter frame, the operation of the driving means is transmitted to the one end via a link, and the cutter frame is projected outward from an outer peripheral edge of the cutter head with the other end as a pivot point. Is preferred.

It is preferable that the cutter frame has a plurality of cutter bits arranged on an outer peripheral surface thereof.

A plurality of cutter frames are provided along an outer peripheral position of the cutter head, and a predetermined protrusion amount and a predetermined protrusion position of the corresponding cutter frame are designated with a rotation operation of the cutter head, and a predetermined shape of the cutter frame is provided. It is preferred that tunnel widening can be performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a copy cutter apparatus for a shield excavator according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 and FIG. 2 are shown for explaining the configuration of two units located at the upper part and the operation state of the two units in the copy cutter device 10 mounted on the cutter head 2 of the shield excavator 1 in the present embodiment. It is a schematic perspective view. In both figures, one of the cut-spokes 3 is shown by a two-dot chain line so that the hydraulic cylinder jack 11 inside the cut-spoke 3 can be seen. FIG. 3 is a partial longitudinal sectional view showing an attached state and an operation state of the copy cutter device 10 in the shield excavator, and FIG. 4 is an enlarged view schematically showing an operation state of the copy cutter device 10. FIG.
As shown in the figure, the cutter head 2 of the shield excavator 1 has three cut-spokes 3 on the center shaft 4.
They are mounted radially at equal angular intervals of 20 °. Further, auxiliary spokes 5 are radially attached between the respective cut spokes 3. The outer peripheral end of each of the cut spokes 3 and the auxiliary spokes 5 is surrounded by an outer peripheral ring plate 6 that rotates integrally with these spokes 3 and 5.
The copy cutter device 10 is equipped so as to be located between the cutter spoke 3 and the auxiliary spoke 5 near the outer peripheral ring plate 6.

Hereinafter, the configuration of the copy cutter device 10 will be described with reference to the drawings. One Katas Spoke 3
Inside, two hydraulic cylinder jacks 11 capable of independently operating two adjacent copy cutter devices 10 are provided.
Are fixed side by side on the pedestal 13 (FIGS. 1 and 3).
(A)). Cylinder 11 of each hydraulic cylinder jack 11
One end of a link arm 12 is rotatably connected to a tip end of the link arm 12 via a hinge (FIGS. 3A and 4). The other end 12a (outer peripheral end) of the link arm 12
Is rotatably connected to one end 15a of the cutter frame 15. The cutter frame 15 is a shaped steel member having an arc shape having a radius of curvature slightly smaller than the radius of curvature of the skin plate constituting the outer peripheral ring plate 6. In the present embodiment, the cutter frame 15 is configured such that the outer peripheral ring plate is formed within a range of an angle (60 °) between the cut spokes 3 and the auxiliary spokes 5 arranged so as to divide the entire periphery of the outer peripheral ring plate 6 into six equal parts. 6 is located inward from the inner surface by a predetermined position. At this time, an end 15b opposite to the end connected to the link arm 12 is hinged to a fixed portion fulcrum 18 in the auxiliary spoke 5.

An outer peripheral ring plate 6 at an outer peripheral position where each cutter frame 15 is disposed, and an opening 7 cut out slightly larger than a projection area of the opposing cutter frame 15, and the cutter frame 15 is formed as described later. When the cutter frame 15 rotates outward by a predetermined angle around the fixed portion fulcrum 18 and projects outward, a part of the cutter frame 15
From the side a, it protrudes from the opening 7 toward the ground. A plurality of cutter bits 16 are mounted along the tip of the outer circumferential surface of the cutter frame 15 in the rotational direction and along the circumferential direction. In particular, by attaching a plurality of cutter bits along the longitudinal direction of the cutter frame 15, the conventional copy cutter device 10 can be used.
The efficiency of ground cutting is greatly improved compared to For simplification of the drawing, illustration of these cutter bits 16 is partially omitted.

FIGS. 1 and 3A show a copy cutter device 1.
0 shows the initial state. In this state, the cylinder 11a of the hydraulic cylinder jack 11 is in the retracted state, the entire cutter frame 15 is accommodated in the cutter head 2, and the cutter bit 16 mounted on the surface thereof does not protrude from the outer peripheral ring plate 6. 2 and 3 from this state.
(B), as shown in FIG. 4, when the cylinder 11a is extended, the link arm 12 is connected to one end 1 of the cutter frame 15.
It operates to push 5a outward. At this time, the other end 15b of the cutter frame 15 is hingedly connected to the fixed fulcrum 18, so that the cutter frame 15 rotates around the fixed fulcrum 18, and the end connected to the link arm 12 has an opening of the outer peripheral ring plate 6. 7 so as to protrude outward.

FIG. 4 is an enlarged view schematically showing the structure of each means for controlling the operation amount of the hydraulic cylinder jack 11 for operating one copy cutter device 10. As shown in FIG. As shown in the figure, the cutter frame 15 protrudes outward from the opening 7 of the outer peripheral ring plate 6 of the excavator around the fixed fulcrum 18 due to the extension of the cylinder 11a of the hydraulic cylinder jack 11. In order to detect the amount of protrusion of the frame 15 toward the ground, an angle sensor 21 for detecting the amount of rotation of the rotation pin at the fixed fulcrum 18 is provided. Further, a non-contact distance sensor 22 for checking the clearance between the grounds widened by the copy cutter device 10 is installed near the cutter frame 15. Angle information in the circumferential direction of the hydraulic cylinder jack 11 to be controlled can also be obtained from angle information of the cut spokes 3. The control unit 20 controls the cylinder 11a of the hydraulic cylinder jack 11 to be operated based on the detection information.
Is set, and an operation command is output to a pressure source 23 such as a hydraulic pump.

FIG. 5 is a schematic diagram showing an example of the configuration of a shield excavator 1 provided with six copy cutter devices 10. Each copy cutter device 10 can independently perform the cylinder expanding / contracting operation of each hydraulic cylinder jack 11, but when the actual copy cutter device 10 is operated, a tunnel widening shape, a widening pattern, The hydraulic cylinder jack 11 of the copy cutter device 10 corresponding to the position or the like is operated, and the cylinder 11a is operated.
Control the amount of expansion and the timing of expansion. The control can perform not only automatic operation programmed in advance but also manual operation.

FIGS. 6 and 7 are explanatory diagrams schematically showing the operation state of the copy cutter device 10 in an example applied to each tunnel widening operation. FIG. 6 shows a circular tunnel T _1.
Shows an application example of drilling a circular tunnel T ₂ diametrically enlarged tunnel diameter concentrically from the cross-section. In the operation state of the copy cutter device 10, the cutter bit (not shown) drives the hydraulic cylinder jacks 11 of the three copy cutter devices 10A facing in the rotation direction of the cut-spoke 3, and moves the cutter frame 15 by a predetermined amount. Rotation of the cutter head 2 and excavation of the excavator are performed in a state of protruding to the mountain side. Thereby, it is possible to excavate while efficiently cutting the widened portion. When the cutter spoke 3 is driven to rotate in the reverse direction, excavation is performed by the other three copy cutter devices 10B.

[0019] Figure 7, with the excavation of the shield excavator, shows an application example of the copy cutter device 10 which is adapted to widen only the side of the circular tunnel T _1. As shown in the drawing, the cylinder 11a of the hydraulic cylinder jack 11 of the copy cutter device 10 is controlled at the top and bottom of the tunnel so that the extension of the cylinder 11a is zero and the extension of the cylinder 11a is maximized at the spring line. by, it is possible to drill the elliptical cross-section tunnel T ₃ which is widened laterally.

FIG. 8 is a state explanatory view showing a modification of the copy cutter device. As shown in the drawing, in the copy cutter device 10C of the present modification, two cutter frames 15 adjacent to one hydraulic cylinder jack 11 are operated. Two link arms 12 are connected to the tip of a cylinder 11a of one hydraulic cylinder jack 11 installed in a cutter spoke (not shown),
One end of a cutter frame 15 installed extending from the opposite side is connected to each link arm 12. According to the copy cutter device 10C configured as described above,
By extending the cylinder 11a, two adjacent cutter frames 15 can be operated at the same time, and widening work of the tunnel side can be realized with a simple structure.
FIG. 8 shows a case in which a shield excavator is suddenly turned in a sharp curve shield tunnel.
Shows an example of a tunnel section T ₄ obtained by widening only the side of the tunnel side.

In the above description, the configuration of the copy cutter device has been described by taking as an example an open type cutter head shield excavator composed of three cutter spokes 3 as shown in FIG. However, the number of copy cutter devices to be equipped can be set as appropriate, and the present invention can be applied to shield excavators having different cutter head shapes, cutter head support methods, and different numbers of cutter spokes. Furthermore, other driving means such as an electric motor can be applied to the driving portion for projecting the cutter frame, in addition to the hydraulic cylinder jack. Also, the cutter frame of the copy cutter device of the present invention can be provided without providing the outer peripheral ring plate 6 on the cutter head as a structure of the shield excavator,
In this case, the cutter head can have a simple structure.

[0022]

As described above, since a plurality of cutter bits can be mounted on the cutter frame of the copy cutter device, the cutting durability of the copy cutter device is increased. Further, since the cutter frame is supported at two points, the fixed fulcrum and the movable part, structural strength can be increased. In addition, the cutting range of the ground around the tunnel can be set large, and an effect of performing an efficient widening operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view (an initial state) showing an embodiment of a copy cutter device of a shield excavator according to the present invention.

FIG. 2 is a schematic perspective view showing an example of an operation state (a cutter frame protruding state) of the copy cutter apparatus of FIG. 1;

FIG. 3 is a partial longitudinal sectional view showing an operation state of the copy cutter apparatus (an initial state, a cutter frame protruding state).

FIG. 4 shows the operation state (projection state) of the copy cutter device.
FIG. 2 is a partially enlarged view showing a schematic configuration of a control unit.

FIG. 5 is a schematic configuration diagram illustrating a configuration example of an arrangement of a copy cutter device.

FIG. 6 is an operation state diagram showing an example of application to tunnel widening by a copy cutter device.

FIG. 7 is an operation state diagram showing another example of application to tunnel widening by the copy cutter device.

FIG. 8 is a schematic configuration diagram showing a schematic configuration of a modification of the copy cutter device.

FIG. 9 is a schematic perspective view showing an example of a conventional copy cutter device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Cutter head 3 Cutter spoke 5 Auxiliary spoke 6 Outer ring plate 7 Opening 10 Copy cutter device 11 Hydraulic cylinder jack 12 Link arm 15 Cutter frame 16 Cutter bit 18 Fixed part fulcrum 20 Control part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuo Miyazawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Toru Goto 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Akira Yoshikawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation F-term (reference) 2D054 AA05 AC01 BA03

Claims (4)

[Claims] 1. A cutter installed in a cutter spoke of a cutter head of a shield excavator, and a bridge extending along a circumferential direction of an outer peripheral edge of the cutter head between adjacent cutter spokes and one end thereof. A cutter frame connected to a driving means in the cut spoke and having the other end rotatably supported at another cut spoke position adjacent to the cut spoke, wherein a part of the cutter frame is operated by the driving means. A copy cutter device for a shield excavator, wherein the copy cutter device protrudes outward from the outer peripheral edge to cut the ground around the tunnel. 2. The cutter frame according to claim 1, wherein an operation of said driving means is transmitted to said one end via a link, and said cutter frame projects outward from an outer peripheral edge of said cutter head using said other end as a pivot point. The copy cutter device for a shield excavator according to claim 1, wherein: 3. The copy cutter device for a shield excavator according to claim 1, wherein the cutter frame has a plurality of cutter bits arranged on an outer peripheral surface thereof. 4. A plurality of cutter frames are provided along an outer peripheral position of the cutter head, and a predetermined protrusion amount and a predetermined protrusion position of a corresponding cutter frame are designated according to a rotation operation of the cutter head. The copy cutter device for a shield excavator according to claim 1, wherein the shape of the tunnel can be widened.