JPH061676Y2 - Shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a shield machine, and in particular, a shield machine equipped with a segment assembling device suitable for assembling a segment using a horizontally tapered key segment. Regarding

[Conventional technology]

As the primary lining segment in the shield construction method,
Usually, as shown in FIG. 10, a structure in which the key segment 4b is inserted between the adjacent segments 4a from the inside in the radial direction is used, but in recent years, as shown in FIG. 11 to FIG. A structure in which the horizontally tapered key segment 4c is inserted laterally between the adjacent segments 4a has come into wide use. This is because the segment using the horizontally tapered key segment has a higher safety against external pressure than the normal segment because the segment is prevented from coming out by the adjacent segment in the tunnel axis direction after the segment is assembled.

FIG. 7 shows a state in which a segment using a horizontally tapered key segment is assembled in the shield machine. In the figure, 1 is a shield body, 2 is a cutter wheel provided on the entire surface of the shield body 1, 3 is an erector device for segment assembly provided inside the shield body 1, 4, 4, ... Existing segment, 4a is a segment being assembled, 5 is a shield jack mounted inside the shield body 1, 6 is a spreader,
Reference numeral 7 is an earth removing device, and 8 is a back surface of the segment.

FIG. 8 and FIG. 9 are detailed structural views of an erector device used for assembling a normal segment. The rotating ring 9 is rotatably driven by a drive device (not shown) and one end is fixed to the rotating ring 9. Arm 10, a suspension beam 12 supported by the arm 10 via a guide rod 11 and movable in the radial direction of the rotary ring 9, and a pressing jack fixed to the arm 10 and moving the suspension beam 12 in the radial direction. 13 and
A slider 15 that is supported on the suspension beam 12 via a guide rod 14 and is movable in the front-rear direction, and a slide jack 17 that is fixed to the suspension beam 12 and that moves the slander 15 and the grip 16 coupled thereto to the front-back direction, Segment 4a
It has a function of hoisting with a grip 16 to position it at a predetermined position and assembling it in a ring shape. Here, the slide jack 17 is provided for positioning the segment in the front-rear direction, and normally, the slide jack 17 and the hydraulic pump are formed by using an all-port block type hydraulic switching valve 19a as shown in FIG. 20, by switching the oil passage between the oil tank 21, the slide jack 17 is operated,
When the spool of the hydraulic pressure switching valve 19a is set to the neutral position, the piston 17a of the slide jack 17 is locked at any position. Further, in the conventional erector device, in order to facilitate the segment assembly work, a plurality of segment steady rests 18 each having a shape to come into contact with the rear surface of the segment 4a suspended by the grip 16 are provided around the grip 16. There are many.

In assembling the segment using the horizontal taper key segment, as shown in FIG. 7, a space d necessary for inserting the horizontal taper key segment 4c is previously provided between the front end of the segment 4a and the spreader 6. Then, the segments 4a are sequentially assembled from the lower part to the left and right sides, and finally, the horizontally tapered key segment 4c is held by the grip 16 of the erector device 7 and, as shown in FIG. 12 and FIG.
Position it so that it is partially inserted with the clearance c kept between it and the adjacent segment 4a, and then operate the shield jack 5 to push the horizontally tapered key segment 4c from the side (direction of arrow B in FIG. 12). As shown in FIGS. 13 and 15, the diameter of the entire segment ring is increased by inserting the segment ring 4a into a position where it is in close contact with the adjacent segment 4a.

[Problems to be solved by the device]

The above-mentioned prior art has the following problems when assembling a segment using a horizontally tapered key segment. First, in the conventional elector device, the all-port-block type hydraulic switching valve 19a as shown in FIG. 4 is used to operate the slide jack 17, and the hydraulic switching valve 19a is operated at the spool neutral position. Slide jack 17
Since the piston 17a is locked, when the horizontal taper key segment 4c is inserted by the shield jack 5, the hydraulic switching valve 19a must be operated to operate the slide jack 17 at the same time, which complicates the operation. Secondly, in the conventional erector device equipped with the segment steady rest 18, when the shield jack 5 inserts the horizontally tapered key segment 4c, the tip of the key segment 4c is caught by the segment steady rest 18, and the key segment 4c is removed. There is a risk that the eclectic device 7 may be deformed due to damage or transmission of the thrust of the shield jack 5 for inserting the key segment to the erector device 7.

An object of the present invention is to eliminate the complexity of the jack operation when inserting the horizontal tapered key segment as described above, and to cause the deformation of the erector device and the damage of the key segment due to the shield jack thrust for inserting the key segment. The present invention is to provide a shield machine capable of smoothly assembling a segment using a horizontally tapered key segment.

[Means for Solving the Problems]

In the shield machine for assembling the segments, a horizontal taper key segment held by the grip of the erector device is inserted laterally between adjacent segments by a shield jack, and a slide for moving the grip of the erector device back and forth. In the hydraulic circuit of the jack, a hydraulic switching valve that connects the oil chambers on both sides of the piston of the slide jack to the oil tank at the neutral position of the spool is provided, and at the tip of the segment swing stopper arranged around the grip of the erector device, This is accomplished by mounting a guide that guides the insertion of the horizontal tapered key segment.

[Action]

According to the present invention, when the horizontally tapered key segment is inserted by the shield jack, even if the slide jack is not operated, the piston of the slide jack is not locked, so that the shield jack can move following the operation of the shield jack. Also, when inserting the horizontally tapered key segment, the guide body attached to the tip of the segment steady rest rolls into contact with the back surface of the key segment and guides the key segment to the insertion position. There is no possibility of being caught by the segment steady rest and causing deformation of the erector device or damage to the key segment.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3 and 5.
This will be described with reference to FIG.

1 to 3 are detailed structural views of an erector device which is a main component of the present invention. In the drawings, the same parts or parts having the same functions as those of the conventional example shown in FIGS. The same reference numerals are given. Also, the hanging beam of the erector device 7
FIGS. 5 and 6 show examples of the hydraulic system configuration of the slide jack 17 which is fixed to the slider 12 and which moves the slider 15 and the grip 16 fitted to the slider 12 back and forth. To operate the slide jack 17, the all-port open type hydraulic switching valve 19b is used in the example of FIG. 5, and the P-port block type hydraulic switching valve 19c is used in the example of FIG. As shown in the drawing, these hydraulic pressure switching valves 19b and 19c are provided at both sides of the oil chambers of the piston 17a of the slide jack 17 at the neutral position of the spool.
Since it is communicated with 21, as shown in FIG. 12 and FIG. 13, when inserting the horizontal tapered key segment 4c with the shield jack 5, even if the slide jack 17 is not operated,
The piston 17a moves following the operation of the shield jack 5. In the above configuration, if the stability of the slide jack 17 becomes a problem, it can be dealt with by providing a flow rate adjusting means such as a throttle valve 22 in the push / pull circuit of the slide jack 17, as shown in FIG.

Further, in this embodiment, a roller-shaped guide body 18a is rotatably mounted on a shaft 18b at the tip of the segment steady rest 18 arranged around the grip 16 of the erector device 7, and the guide body 18a is gripped by the grip 16a. The segment 4a is hung by the back of the segment 4a to prevent the segment from swaying, and when the horizontally tapered key segment 4c is inserted by the shield jack, the guide body 18a catches the key segment 4c on the segment steady rest 18. Instead, they are guided in the insertion direction. The guide 18a is not limited to a roller, but may be a ball.

Other than the above, the configuration of each part of the shield machine and the segment assembly procedure, etc. are the same as in the conventional case.

[Effect of the Invention] According to the present invention, the following effects can be obtained.

(1) When inserting the horizontally tapered key segment by the shield jack, it is not necessary to simultaneously operate the slide jacks of the erector device, which simplifies the operation.

(2) When inserting the horizontally tapered key segment with the shield jack, the tip of the key segment can be inserted smoothly without getting caught by the segment steadying device.
It is possible to prevent deformation of the erector device and damage to the segment due to the shield jack thrust.

[Brief description of drawings]

1 is a cutaway side view of an erector device showing an embodiment of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a sectional view taken along line AA of FIG. 1, and FIG. 4 is a slide of a conventional erector device. Jack hydraulic system diagram, FIGS. 5 and 6 are slide jack hydraulic system diagrams showing an embodiment of the present invention, and FIG. 7 is an assembly of a segment using a horizontal tapered key segment in a shield machine. FIG. 8 is a sectional side view showing a state in which a conventional erector device is cut, FIG. 9 is a cutaway side view thereof, FIG. 9 is a front view of the same, and FIG.
FIG. 11 is an assembly drawing of a segment using a horizontal tapered key segment, FIG. 12 and FIG. 13 are plan views showing an inserting process of the horizontal tapered key segment, and FIG. 14 is CC of FIG.
FIG. 15 is a sectional view taken along line DD of FIG. DESCRIPTION OF SYMBOLS 1 ... Shield main body, 3 ... Erector device, 4 ... Existing segment, 4a ... Segment being assembled, 4b ... Normal key segment, 4c ... Horizontally tapered key segment, 5 ... Shield jack, 16 ... Grip, 17 ... Slide jack , 18 ... Segment steady rest, 18a ... Guide body, 19a,
19b, 19c ... hydraulic switching valve, 20 ... hydraulic pump, 21 ... oil tank.

Claims (1)

[Scope of utility model registration request] 1. A shield excavator in which a horizontally tapered key segment held by a grip of an erector device is inserted laterally between adjacent segments by a shield jack to move the grip of the erector device back and forth. In the hydraulic circuit of the slide jack, a hydraulic switching valve that connects the oil chambers on both sides of the piston of the slide jack to the oil tank at the neutral position of the spool is provided, and at the tip of the segment steady rest arranged around the grip of the erector device. , A shield machine equipped with a guide body for guiding the insertion of the horizontally tapered key segment.