JP6918615B2 - Shape retention device and shield excavator - Google Patents

Description

The present invention relates to a shape retaining device mounted on a shield excavator and a shield excavator including the shape retaining device.

Conventionally, a shield excavator for excavating a tunnel is equipped with an elector device and a shape-retaining device. The Elekta device assembles a plurality of segments along the wall surface of the tunnel, and the shape-retaining device holds the shape of a segment ring composed of the assembled segments. The cross-sectional shape of the tunnel may be circular or rectangular.

For example, Patent Document 1 discloses a shape holding device including an arc-shaped pressing member that presses the ceiling portion of a circular segment ring and a pair of jacks that move the pressing member up and down.

Japanese Patent No. 30142383

By the way, depending on the type of tunnel, at least one segment located on the ceiling or side of the segment ring may have an inwardly projecting protrusion. A conventional shape-retaining device cannot be used for a segment ring containing such a segment.

Therefore, the present invention includes a shape-retaining device that can be used when at least one segment located on the ceiling or side of the segment ring has an inwardly projecting protrusion, and a shield including the shape-retaining device. The purpose is to provide a digger.

In order to solve the above problems, the shape-retaining device of the present invention is a shape-retaining device mounted on a shield excavator that holds the shape of a segment ring composed of a plurality of segments, and is a ceiling portion of the segment ring or a ceiling portion of the segment ring. A pressing member that presses the side portion, and at least one jack that moves the pressing member between a pressing position that presses the ceiling or side portion of the segment ring and a standby position inside the pressing position. The at least one segment located on the ceiling or side of the segment ring has an inwardly projecting protrusion, and the pressing member has a recess for avoiding interference with the projecting portion. Is formed.

According to the above configuration, at least one segment located on the ceiling or side of the segment ring has an inwardly projecting protrusion, but the pressing member avoids interference with that protrusion. A depression is formed for this. That is, even if the pressing member is moved to the pressing position, it does not interfere with the protruding portion of the segment. Therefore, the shape-retaining device can be used for the segment ring having the protrusion formed on the ceiling or the side.

The shape-retaining device may further include an attachment that is removable from the recess of the pressing member and has an outer surface shape corresponding to the inner surface shape of the segment having no protrusion. According to this configuration, when the segment constituting the segment ring does not have a protruding portion protruding inward, the segment can be pressed even in a place where the recess exists by attaching the attachment to the recess of the pressing member. ..

The shape-retaining device may further include a jack attached to a portion of the pressing member along the recess to press the protrusion of the segment when the pressing member is located at the pressing position. According to this configuration, the protrusion can be pressed even in the place where the depression exists.

Further, the shield excavator of the present invention includes the above-mentioned shape-retaining device.

According to the present invention, there is provided a shape-retaining device that can be used when at least one segment located on the ceiling or side of the segment ring has an inwardly projecting protrusion.

It is a side view of the shield excavator including the shape holding device which concerns on one Embodiment of this invention. It is a front view of the shape holding device seen from the rear of a shield excavator, and shows a state in which a pressing member is in a standby position. It is a front view of the shape holding device seen from the rear of a shield excavator, and shows a state in which a pressing member is in a pressing position. It is a figure which shows the state which the attachment is attached to the recess of the pressing member. It is a front view which shows a part of the pressing member of the modification.

FIG. 1 shows a shield excavator 1 including a shape holding device 3 according to an embodiment of the present invention. The shield excavator 1 is equipped with an elector device 15 that assembles a plurality of segments 21 along the wall surface of the tunnel, and a shape holding device 3 that holds the shape of the segment ring 2 composed of the assembled segments 21.

Specifically, the shield excavator 1 includes a cutter head 11 and a body portion 12 that rotatably supports the cutter head 11. The body portion 12 includes a tubular casing 13 and a plurality of shield jacks 14 arranged in the casing 13. The shield jack 14 is for pressing the segment ring 2 to advance the shield excavator 1.

Further, inside the body portion 12, a rear work deck 16 extending rearward along the central axis of the shield excavator 1 is provided. The erector device 15 rotates around the rear work deck 16, and the shape-retaining device 3 is slidably supported by the rear work deck 16 in the front-rear direction, and is slidably supported forward or backward by a sliding jack (not shown). Will be moved.

As shown in FIG. 2, in the present embodiment, the cross-sectional shape of the tunnel is circular. However, the cross-sectional shape of the tunnel may be rectangular. Further, in the present embodiment, the segment 21 located at the ceiling portion and the bottom portion of the segment ring 2 has a protruding portion 22 protruding inward.

The shape holding device 3 includes a pressing member 6 that presses the ceiling portion of the segment ring 2 and a reaction force member 7 that abuts on the bottom portion of the segment ring 2. The pressing member 6 and the reaction force member 7 extend in the left-right direction so as to face each other with the rear work deck 16 in between.

The pressing member 6 has a pressing surface 60 having the same curvature as the inner diameter of the segment ring 2. Further, the pressing member 6 is formed with a recess 61 for avoiding interference with the protruding portion 22 of the segment 21. That is, the pressing surface 60 is divided by the recess 61.

It is desirable that the recess 61 has a shape along the protrusion 22. In the present embodiment, the protrusion 22 has a triangular shape, and the recess 61 has a triangular shape slightly larger than the protrusion 22. However, the recess 61 does not necessarily have to have a shape along the protrusion 22, and may be, for example, a right-angled triangle, a rectangle, or a semicircle.

In the reaction force member 7, the inner ends of the arc portions 71 and 73 are connected by a straight portion 72 so that only the arc portions 71 and 73 located at both ends abut on the segment ring 2. The arc portions 71 and 73 have a contact surface 70 having the same curvature as the inner diameter of the segment ring 2.

Further, the shape retaining device 3 includes a pair of left and right frames 41 arranged on both sides of the rear work deck 16. The frame 41 extends in the vertical direction between both ends of the pressing member 6 and both ends of the reaction force member 7, and is slidably connected to the rear work deck 16 via the arms 42 and 43. Further, the upper arm 42 is provided with a centering jack 44 for aligning the center of the shape holding device 3 with the center of the segment ring 2 in the left-right direction.

The above-mentioned pressing member 6 is located between a pressing position for pressing the ceiling portion of the segment ring 2 as shown in FIG. 3 and a standby position inside the pressing position as shown in FIG. 2 by at least one jack. Will be moved. Further, the reaction force member 7 has a contact position where the reaction force member 7 comes into contact with the bottom of the segment ring 2 as shown in FIG. 3 by at least one jack, and a standby position inside the contact position as shown in FIG. Moved between. In this embodiment, two expansion jacks 51 are used as jacks common to the pressing member 6 and the reaction force member 7. The expansion jack 51 is, for example, a hydraulic cylinder (the same applies to the centering jack 44 described above).

Each expansion jack 51 is attached to the central portion of the frame 41 in a direction in which the axial direction is the vertical direction. The upper end of each expansion jack 51 is pin-connected to the lower end of the upper rod 52 extending in the vertical direction, and the upper end of the upper rod 52 is pin-connected to the end of the pressing member 6. The upper rod 52 is slidably supported by the frame 41 in the vertical direction.

On the other hand, the lower end of each expansion jack 51 is pin-connected to the upper end of the lower rod 53 extending in the vertical direction, and the lower end of the lower rod 53 is pin-connected to the end of the reaction force member 7. The lower rod 53 is slidably supported by the frame 41 in the vertical direction.

Then, when the expansion jack 51 is shortened, both the pressing member 6 and the reaction force member 7 are moved to the standby position as shown in FIG. 2, and when the expansion jack 51 is extended, the pressing member 6 is moved as shown in FIG. The reaction force member 7 is moved to the contact position while being moved to the pressing position.

However, the jack for moving the pressing member 6 and the jack for moving the reaction force member 7 may be provided separately.

As described above, in the shape holding device 3 of the present embodiment, the segment 21 located on the ceiling of the segment ring 2 has a protruding portion 22 that protrudes inward, but the pressing member 6 has a protruding portion 22 thereof. A recess 61 is formed to avoid interference with the portion 22. That is, even if the pressing member 6 is moved to the pressing position, it does not interfere with the protruding portion 22 of the segment 21. Therefore, the shape holding device 3 can be used for the segment ring 2 in which the protruding portion 22 is formed on the ceiling portion.

(Modification example)
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

For example, as shown in FIG. 4, the shape-retaining device 3 may include a detachable attachment 8 in the recess 61 of the pressing member 6. The attachment 8 has an outer surface shape corresponding to the inner surface shape of the segment 21 having no protrusion 22. In other words, the attachment 8 constitutes a pressing surface continuous with the pressing surface 60. For example, the attachment 8 is fastened to the pressing member 6 with bolts and nuts.

If such an attachment 8 is provided, if the segment 21 constituting the segment ring 2 does not have a protruding portion 22 projecting inward, the attachment 8 is attached to the recess 61 of the pressing member 6 to form a recess. The segment 21 can be pressed even where the 61 is present. When the recess 61 is relatively small, the pressing member 6 alone is sufficient without the attachment 8.

Further, as shown in FIG. 5, one or a plurality of support jacks 9 may be attached to the portion of the pressing member 6 along the recess 61. The support jack 9 is, for example, a hydraulic cylinder. The support jack 9 presses the protruding portion 22 of the segment 21 when the pressing member 6 is located at the pressing position. If the support jack 9 is provided in this way, the protrusion 22 can be pressed even in the place where the recess 61 exists.

When the cross-sectional shape of the tunnel is rectangular, the segment 21 having the protruding portion 22 is located on the side portion of the segment ring 2, and the shape-retaining device presses the side portion of the segment ring 2. The side pressing member may be formed with a recess for avoiding interference with the protruding portion 22. With this configuration, the shape holding device can be used for the segment ring 2 having the protruding portion 22 formed on the side portion.

1 Shield excavator 2 Segment ring 21 Segment 22 Protruding part 3 Shape holding device 6 Pressing member 61 Depression 51 Expansion jack 8 Attachment 9 Support jack

Claims (4)

A shape-retaining device that holds the shape of a segment ring consisting of multiple segments mounted on a shield excavator.
A pressing member that presses the ceiling or side of the segment ring,
It comprises at least one jack that moves the pressing member between a pressing position that presses the ceiling or side of the segment ring and a standby position inside the pressing position.
At least one segment located on the ceiling or side of the segment ring has an inwardly projecting protrusion.
A shape-retaining device in which a recess is formed in the pressing member to avoid interference with the protruding portion. The shape holding device according to claim 1, further comprising an attachment that is removable from the recess of the pressing member and has an outer surface shape corresponding to the inner surface shape of the segment that does not have the protruding portion. The shape retention according to claim 1 or 2, further comprising a jack attached to a portion of the pressing member along the recess to press the protruding portion of the segment when the pressing member is located at the pressing position. Device. A shield excavator comprising the shape-retaining device according to any one of claims 1 to 3.

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