JPH0996190A - Overcutter device of tunnel excavating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the support strength and enable smooth excavation by supporting a roller cutter of an overcutter device of a shield machine between oscillating arms always coming into contact with a strength member of a cutter head. SOLUTION: Plural sets of over break overcutter devices 10 are assembled in a cutter head 2 of a shield machine 1. Oscillating arms 13 extended in the radial direction of the cutter head 2 are welded in a pair on both sides of a box-shaped bracket 11b for supporting the main body of a roller butter 11 in parallel and firmly integrated, and a jack 14 as a driving source is connected to the oscillating arms 13. The respective pairs of oscillating arms 13 are oscillated while sliding with a spoke 2a of a cutter head 2, both side surfaces of which are strength members, and also after oscillation is stopped, the contact with the spoke 2a is kept regardless of an angle. Thus, the shaft of the roller cutter 11 is held by the bracket 11b and further clamped by the oscillating arms 13 supported from both sides by the cutter head 2 so that the strength of the overcutter device 10 is remarkably enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an over-cutter device for over-digging, which is equipped in a tunnel excavator such as a shield excavator including a rotary cutter head.

[0002]

2. Description of the Related Art A tunnel excavator having a rotary cutter head at its front portion excavates a tunnel while rotating the cutter head. However, when digging a curve, it is necessary to dig a large amount of the inside of the curve (so-called over-digging), so many tunnel excavators in recent years use an overcutter device (copy cutter) for over-digging. Sometimes called)) is equipped. The overcutter device is provided with another cutter so as to be capable of projecting and retracting outward in the radial direction with respect to the cutter head so that the side part (outer circumference) of the normal excavation range of the cutter head can be excavated when necessary. . The overcutter device includes a roller cutter that presses a rotatable roller having a hard edge around it against the ground (in the direction in which the roller rotates) and excavates the ground while crushing the ground with the pressing force. Commonly used.

An example of a conventional overcutter device with a roller cutter is shown in FIGS. 4 and 5. The apparatus shown in FIG. 4 is disclosed in Japanese Unexamined Patent Publication No. 7-82988, in which a support 62 which is movable in the radial direction is provided near the outer circumference of a rotary cutter head 2, and a roller cutter 61 is attached to the end of the support 62. Has been. The support body 62 is slidably inserted in a cylindrical guide 63 fixed along the radial direction, and is moved by a hydraulic jack 64. On the other hand, the device shown in FIG. 5 is disclosed in Japanese Utility Model Laid-Open No. 61-6598, and the roller cutter 7 is swingably mounted on the outermost peripheral portion of the cutter head 2.
1 is provided. The roller cutter 71 is supported by a holding body 72 having a swinging fulcrum (shaft 72a) outward, and swings together with the holding body 72 to move outward when a hydraulic jack 73 extending from the rear extends. .

[0004]

Since the excavation route of the tunnel excavator is not uniform and is often ground including large-diameter gravel or rocky ground, the overcutter device has a sufficient strength. is necessary. However, the overcutter device of FIGS. 4 and 5 still has room for improvement in strength.

For example, in the case of the apparatus shown in FIG. 4, although the base of the support body 62 is supported by the cylindrical guide 63, the vicinity of the tip of the support body 62 is not supported by the guide 63, so the roller cutter 61 receives it. The impact force must be supported only by the support 62, and the vicinity of its tip forms a so-called neck, which is not sufficient in terms of strength. If the vicinity is bent, the roller cutter 61 cannot be moved (retracted), and it takes time and labor for repairs, etc., and the tunnel excavation efficiency is significantly reduced. In the device of FIG. 5, since the roller cutter 71 is supported only by the shaft body 72a and the hydraulic jack 73 via the holding body 72, an excessive force acts on the shaft body 72a or the hydraulic jack 73,
The same inconvenience as described above may occur. Further, in the case of the device shown in FIG. 5, since the hydraulic jack 73 projects rearward (to the right in the drawing) and rotates together with the cutter head 2, a large amount of excavated earth and sand is attached to the vicinity of the projecting portion, which results in smooth operation. Excavation may be hindered.

The present invention has been made in view of the above points,
It is an object of the present invention to provide a novel overcutter device having features such as supporting a roller cutter with sufficient strength.

[0007]

An overcutter device for a tunnel excavator according to claim 1 is equipped to a tunnel excavator having a rotary cutter head in a front portion thereof for excavating surroundings. An overcutter device with a roller cutter, characterized by the following points a) to c). That is, a) A swing arm extending in the radial direction on the cutter head (an arm that is attached via one swing fulcrum and rotates about a fulcrum within a certain angle range, the longitudinal direction of which is the cutter head). (In the radial direction of the above) are arranged as one set, and a jack that is a drive source for swinging is connected to each set, and b) between the two swinging arms of each set. The roller cutters are attached so that they are supported by two rocking arms.c) In the above rocking arms, one or more of the roller cutters moves in the radial direction of the cutter head due to the rocking of each set (only in the radial direction). In addition to moving, it may also include displacement in the radial direction), and regardless of the swinging angle (however, the swingable angular range is a).
Both sides of each set shall remain in contact with the strength members of the cutter head.

As described above, the overcutter device functions when the tunnel excavator excavates a curve or the like, and excavates the side portion of the excavated portion by the rotary cutter head. In order to operate the overcutter device of claim 1, one or more roller cutters are moved in the radial direction of the cutter head as shown in c) by swinging the swinging arm by the jack shown in a) above. The outer edge of the cutter head. Since the roller cutter is provided on the cutter head and rotates together with the cutter head, the roller cutter protruding to the outside of the peripheral edge of the cutter head as described above is pressed against the side portion of the tunnel to excavate that portion.

Since the tunnel excavator excavates various types of ground as described above, a large force may act on the roller cutter during overdigging. However, the overcutter device of the present invention does not require a sufficient roller cutter. It can be supported with strength. The first reason is that the roller cutter is attached between two rocking arms of each set so as to be supported by the two rocking arms as in the above b). That is, with this configuration, the force received by the roller cutter is directly transmitted to the swing arm which can be configured with high rigidity, without passing through the so-called neck portion where the stress increases. The second reason is that, with regard to the swing arm that receives the force of the roller cutter, both sides of each set are brought into contact with the strength member of the cutter head regardless of the swing angle, as in c) above. . In other words, the rocking arm extends in the radial direction of the cutter head as in a) and is arranged in this state of c), so the force acting on the rocking arm is the strength of the cutter head via its contact surface. It is also supported by members. As described above, since the force received by the roller cutter is smoothly transmitted to the swing arm, and the swing arm is thus supported by the cutter head, it can be said that the strength of this overcutter device is extremely high.

The overcutter device according to claim 2 is further characterized by the following points d) and e). That is, d) the swing arm has a swing fulcrum at a position closer to the inside of the cutter head, and the tip reaches the peripheral edge of the cutter head. Attach the roller cutter of.

In the overcutter device according to claim 2,
When the rocking arm is rocked by the jack of a), the tip of the arm moves in the radial direction of the cutter head while moving slightly forward due to the configuration of d). If one or more roller cutters are attached to such a tip, the roller cutters can move in the radial direction of the cutter head and come out of the periphery as in the case of c) above, and necessary extra dug Will be done. Since a plurality of roller cutters are attached to each set of swing arms as described in e) above, excavation performance is high for the side part of the tunnel and the part close to it. The apparatus of claim 3 is also characterized by the following points. That is, f) The jack, which is the drive source of the swing arm, is arranged so as to connect between the position near the center of the rear portion of the cutter head and the vicinity of the tip of the swing arm.

In this way, the jack has its longitudinal direction oriented in the radial direction of the cutter head in the rear part of the cutter head, and does not project rearward as in the device of FIG. 5, but along the cutter head. And compactly arranged. Then, the excavated earth and sand are unlikely to adhere to the jack, and smooth excavation is likely to be continued.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the invention is shown in FIG.
FIG. 1 (a) is a cross-sectional view of the vicinity of the front end of a relatively small shield machine 1 which is a type of tunnel excavator as seen from the side, and FIG. 1 (b) is a detailed view of a part thereof. same
(c) is a partial front view of the excavator 1. As shown in FIG. 1 (a), the shield machine 1 has a cutter head 1 in the front part and a cylindrical shield 3 on the side surface, inside of which a bearing 4 as well as a gear 5 and a drive source such as a motor are provided. (Not shown), the cutter head 2 is rotated by these actions to dig the natural ground A. This shield machine 1 has a plurality of roller cutters (2x, etc .; others are not shown) in front of a cutter head 2 so that rock or large-diameter gravel ground can be excavated smoothly. Reference numeral 7 in the figure is a screw conveyor for discharging excavated soil and the like.

Cutter head 2 of this shield machine 1
In the above, a plurality of sets (two sets in this example) of overcutter devices 10 are incorporated for overcutting when excavating a curve or the like. Each set of the overcutter device 10 is shown in FIG.
As shown in (c) and (c), one roller cutter 11, a pair of (two) swing arms 13, and one hydraulic jack 14 are included. A bracket 11b is assembled in a box shape between a pair of rocking arms 13 arranged in parallel at intervals, and the arms 13 and the bracket 11b are firmly integrated by welding, and a roller is provided in the bracket 11b. The main body of the cutter 11 is supported. The swing arm 13 has its longitudinal direction oriented in the radial direction of the cutter head 2, the end near the center is attached to the cutter head 2 by a pin 13a which is a swing fulcrum, and the jack 14 is provided near the tip through a pin 14b. Are connected. The jack 14 is a drive source for oscillating the oscillating arm 13, and one end thereof is connected to near the center of the rear portion of the cutter head 2 via a pin 14a. Therefore, jack 1
Similarly to the swing arm 13, the blade 4 is oriented in the radial direction of the cutter head 2 and is compactly arranged along the back surface thereof. The expansion and contraction of the jack 14 allows the swing arm 13 to swing together with the roller cutter 11, and the roller cutter 11 mounted near the tip of the jack 14 can have a maximum of Δr (several tens to several times) as shown in FIG. Only about 100 mm) can be projected outside the peripheral edge of the cutter head 2. Since the overcutter device 10 rotates together with the cutter head 2, the side portion of the normal excavation range of the cutter head 2 is overexcavated when the cutter head 2 is thus projected.

The strength of the cutter head 2 is on both outer sides of the swing arm 13 of each set of the overcutter device 10, that is, the front and rear sides (left and right in FIG. 1C) in the circumferential direction (rotational direction) of the cutter head 2. It is always in contact with the spoke 2a which is a member. That is, the swing arm 13 swings while the surfaces on both sides thereof slide with the spokes 2a of the cutter head 2 and keeps contact with the spokes 2a regardless of the angle even after the swing is stopped. . The rocking arm 13 that rotates together with the cutter head 2 receives a force along the rotation direction (left and right in FIG. 1C) from the roller cutter 11 when excavating, but keeps contact with the spokes 2a as described above. Therefore, the force is also supported by the cutter head 2. The roller cutter 11 is the bracket 1
The shaft is held by 1b, and it is supported in a highly rigid state by being sandwiched by rocking arms 13 extending to both sides thereof. The rocking arm 13 is supported by the cutter head 2 in this way. By supporting from both sides,
It can be said that the strength of the overcutter device 10 is extremely high.
Since the force received by the roller cutter 11 is transmitted to the cutter head 2 as described above, not only the load of the swing arm 13 but also the mechanical load of the pin 13a and the jack 14 (and the connecting pins 14a and 14b) are received. Is naturally reduced.

The hydraulic oil is supplied to the jack 14 by a plurality of pipes 16 and 18 and a rotary joint 17 as shown in FIG. 1 (a). The pipe 16 is placed inside the protection pipe 16a and fixedly connected to the rear of the shield machine 1 (hydraulic device (not shown)), and the pipe 18 is connected to each jack 14 so as to rotate together with the jack 14 and the cutter head 2. It was done. Rotary joint 17
Is connected between the fixed pipe 16 and the rotating pipe 18, and its structure is as shown in FIG. 1 (b), in which the pipe 16 is fixedly arranged by connecting with the protective pipe 16a. An outer cylinder 17d is rotatably attached to the outside of the body 17a to connect the pipe 18. Inner body 17a
Is a linear (axial direction) oil passage 17b connected to the pipe 16.
And a groove 17c connected to it on the outer peripheral surface,
The outer cylinder 17d has a linear (radial direction) oil passage 17 connected to the groove 17c of the inner body 17a and connected to the pipe 18.
e is formed. It goes without saying that the space between the inner body 17a and the outer cylinder 17d is appropriately sealed.

FIG. 2 shows a second embodiment of the invention.
2A and 2B are a side view and a front view of the overcutter device 20 in the front part of the shield machine 1, respectively. This overcutter device 20 has a configuration similar to that of the overcutter device 10 of FIG. 1, except that the swing arm 23 is elongated and two roller cutters 21 and 22 are mounted between the pair of them. It differs from the device 10 of FIG. Extend the hydraulic jack 24 and swing the arm 2.
When the 3 is rocked, so-called over-digging can be performed, but the roller cutter 2 provided near the tip of the arm 23
While one does the original overcutting to the side of the tunnel, another roller cutter 22 provided near the base of the arm 23
However, it excavates a portion near the side of the tunnel to assist overdrilling. In order to dispose a plurality of roller cutters on the swing arm 23 as described above, it is necessary to lengthen the arm 23, but the swing fulcrum (pin 23a) is provided at a position closer to the inner side of the cutter head 2. That is also essential. This is because if the swing fulcrum is provided on the outside as in the example of FIG. 5, the long swing arm 23 cannot smoothly swing during excavation.

In this embodiment, as shown in FIG. 2 (b),
The roller cutters 21 and 22 are each a bracket 21b.
They are held by 22b and mounted so as to be sandwiched by a pair of swing arms 23, and both sides of the swing arms 23 are in contact with the spokes 2a of the cutter head 2. Therefore, the force acting on the roller cutters 21 and 22 is supported by the cutter head 2 as well, and there is no so-called neck portion where the load is particularly severe. Therefore, the overcutter device 20 is also preferable in terms of strength. Since the jack 24 is arranged in the radial direction of the cutter head 2 along the rear surface thereof, the portion that rotates together with the cutter head 2 is compact, and it is also preferable in that it is difficult to attach excavated earth and sand.

FIG. 3 is a side view of an overcutter device 30 as a third embodiment of the invention. This device 30 is characterized in that a part substantially parallel to the longitudinal direction of the shield machine 1 is formed at the tip of the swing arm 33 to be somewhat long, and two roller cutters 31 and 32 are attached to the part. Other than that, there is no difference from the device 20 of FIG. When the hydraulic jack 34 is extended and the swing arm 23 is swung outward, both of these two roller cutters 31 and 32 are pressed against the side portion of the tunnel, so that efficient over dug is possible. If the efficiency of excess digging is high, the excavation of curves can proceed at a high speed.

It should be noted that the plurality of overcutter devices 30 provided in one shield machine 1 do not necessarily have to have the same arrangement of the roller cutters 31 and 32. For example, a certain overcutter device 3
0, the roller cutters 31 and 32 are arranged only at the tip of the swing arm 33 as shown in FIG.
It is also preferable to dispose it on the base of the arm 33 as shown in FIG. By arranging the roller cutters that rotate together with the cutter head 2 at various positions, the tunnel and its side parts are often efficiently excavated.

[0021]

In the overcutter device for a tunnel excavator according to the first aspect of the present invention, the roller cutter is supported and mounted between the rocking arms of each set, and both sides of the rocking arms are always mounted. Since it is in contact with the strength member of the cutter head, the force received by the roller cutter is also supported by the cutter head, and its supporting strength is high.

Further, in the overcutter device according to the second aspect of the present invention, since a plurality of roller cutters are attached to each set of swing arms, excavation performance is high for a side portion of the tunnel or a portion close thereto. Since the swinging fulcrum of the swinging arm is located on the inner side of the cutter head, even a long arm having a plurality of roller cutters swings smoothly during excavation.

According to the apparatus of claim 3, the jack, which is the drive source of the swinging arm, is compactly arranged along the rear portion of the cutter head. Excavation is easy to continue.

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of the invention, FIG. 1 (a) is a side view sectional view showing the vicinity of a front end portion of a shield machine 1, FIG.
Is a detailed view of a part of the same (a), and the same (c) is a partial front view of the excavator 1.

FIG. 2 shows a second embodiment of the invention, and FIGS. 2 (a) and 2 (b) are a side view and a front view of an overcutter device 20 in the front part of the shield machine 1, respectively.

FIG. 3 is a side view of an overcutter device 30 as a third embodiment of the invention.

FIG. 4 is a side view showing a conventional overcutter device.

FIG. 5 is a side view showing another conventional overcutter device.

[Explanation of symbols]

 1 Shield excavator 2 Cutter head 10/20/30 Overcutter device 11/21/22/31/32 Roller cutter 13/23/33 Swing arm 14/24/34 Jack

Claims (3)

[Claims] 1. An overcutter device with a roller cutter, which is equipped to a tunnel excavator having a rotary cutter head in a front part to excavate surroundings, comprising: a) on the cutter head, Arrange two rocking arms extending in the radial direction as a set, and connect a jack that is the driving source of the rocking to each set, and b) Between the two rocking arms of each set, A roller cutter is attached so that it is supported by a rocking arm.c) In the rocking arm, one or more of the roller cutters shall move in the radial direction of the cutter head due to rocking of each set, and An overcutter device for a tunnel excavator, characterized in that both sides of each set maintain contact with the strength member of the cutter head regardless of the angle of movement. 2. The swinging arm has a swinging fulcrum at a position closer to the inner side of the cutter head, and a tip portion thereof reaches a peripheral edge portion of the cutter head, and a plurality of swinging arms are provided in each set. The overcutter device for a tunnel excavator according to claim 1, wherein a roller cutter is attached. 3. The tunnel excavation according to claim 2, wherein the jack is arranged by connecting a position near a center of a rear portion of the cutter head and a vicinity of a tip end portion of the swing arm. Machine overcutter device.