JPH0540153Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention detects the rolling angle when the shield rolls, tilts the shield jack, and reduces the component of the thrust in the circumferential direction of the shield frame. This invention relates to a rolling correction device for a shield that automatically corrects rolling.

[Prior Art] In the shield, the shield frame may rotate in the circumferential direction, causing rolling. When rolling occurs, proper operation becomes difficult, so it is necessary to correct it promptly.

In the case of a shield having a shield frame with a circular cross section, rolling is likely to occur, but rolling can be easily corrected by rotating the excavating rotary cutter attached to the front end of the shield frame in the opposite direction.

[Problem to be solved by the invention] However, in the case of a shield having a cross-sectional shape other than circular, rolling is less likely to occur;
Once rolling occurs, there is a problem in that it is difficult to correct the rolling even if the rotary cutter is rotated in the opposite direction.

The purpose of the present invention is to solve the problems of the prior art described above, and to easily and automatically correct the rolling of not only shields with circular cross sections but also shields with cross sections other than circular. An object of the present invention is to provide a rolling correction device for a shield.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a rolling angle detector for detecting the rolling angle of the shield frame, and a rolling angle detector provided on the inner circumference of the shield frame so as to be tiltable in a tangential direction. A shield jack for rolling correction that applies propulsion and rotational force to the shield frame by the reaction force that presses the end of the existing segment, and a rolling correction of the shield frame based on the detected angle by the rolling angle detector mentioned above. The present invention is characterized by comprising a tilting jack for tilting the shield jack for rolling correction.

[Function] When the shield rolls, the rolling angle is detected by the rolling angle detector, and the rolling correction shield jack uses the tilting jack to correct the rolling of the shield frame based on the detected angle. Tilted tangentially to the frame.

As a result, since the rolling correction shield jack obliquely presses the end of the segment, a component force of the thrust force in the circumferential direction of the shield frame is generated, and the rolling is corrected by this component force.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

In FIGS. 3 and 4 showing mud pressure shields having cross-sectional shapes other than circular, 1 is a shield frame formed in a cocoon-shaped cross-sectional shape by connecting two circles in parallel; A bulkhead 2 is provided at the front end. Two rotary cutters 3 are attached to the bulkhead 2 and rotate around the center of each circle of the shield frame 1, and these cutters 3 are driven to rotate by a drive device 4 installed at the rear of the bulkhead 2. It's getting old. A shield frame 1 is installed in the bulkhead 2 to protect the earth and sand excavated by the cutter 3.
A screw conveyor 5 is arranged in parallel to the rear.

Furthermore, erector rings 6 whose rotation center is around the center of each circle are arranged in parallel in the shield frame 2, and erectors 8 for assembling the segments 7 along the inner circumferential wall of the shield frame 1 are attached to these erector rings 6. It is being

Shield jacks 9 are disposed on the inner circumference of the shield frame 1 at appropriate intervals in the circumferential direction, and a shoe 12 attached to the tip of a piston rod 10 of these shield jacks 9 via a ball joint 11 connects the ends of the segments 7. Propulsive force is obtained from the reaction force that presses the part. In particular, some of these shield jacks 9 are in positions where they can effectively correct the rolling of the shield frame 1.
As shown in FIGS. 2 and 2, it is constituted by a rolling correction shield jack 90 that is mounted so as to be tiltable in the tangential direction of the shield frame 1. By tilting and operating the rolling correction shield jack 90, the reaction force that presses the end of the existing segment 7 applies an axial driving force to the shield frame 1 as well as a circumferential rotational force. ing. A bracket 13 is attached to the inner wall of the shield frame 1 for pivotally supporting the base end of the shield jack 90 for rolling correction, and a flange 14 attached to the rear of the bracket 13 is attached to the tip of the shield jack 90. An opening 15 is formed through which the opening 15 can be tilted. Further, a guide frame 17 is attached to the flange 14 for slidably supporting a support frame 16 attached to the tip of the shield jack 90 in the tangential direction of the shield frame 1. In order to tilt each shield jack 90, a hydraulic or screw type tilting jack 19 is attached to the flange 14 via a bracket 18, and the tip of the piston rod 20 is connected to the support frame 16.

Shield frame 1 inside shield frame 1
A rolling angle detector (rolling meter) 21 is attached to detect the rolling angle of the shield frame 1, and the tilting jack 19 corrects the rolling of the shield frame 1 based on the angle detected by the rolling angle detector 21. It is configured to tilt the jack 90. Specifically, the detection signal from the rolling angle detector 21 is input to the control device 22, and the control device 22 calculates the operation amount of the tilting jack 19 to obtain the tilting angle of the shield jack 90 for correcting rolling. The tilting jack 19 is operated based on the calculation.

Next, the operation of the embodiment will be described.

When the shield tilts during digging, the rolling angle is detected by the rolling angle detector 21, and based on this detection signal, the control device 22 calculates the operation amount of the tilting jack 19 and controls the tilting jack 19. Manipulate. As a result, a pressing force is applied diagonally to the end of the existing segment 7 through the shoe 12 due to the operation of the shield jack 90 for rolling correction, so that the shield frame 1 is propelled in the axial direction and shielded from the pressing force. The shield frame 1 is rotated in the circumferential direction by the component force in the frame tangential direction, and rolling is corrected by this rotation.

In this case, since it is difficult to tilt the shield jack 90 while the shield jack 90 is pressing the segment 7, the shield jack 90 other than the one for rolling correction is pressing the segment 7. During the rolling correction, the shield jack 90 is tilted without being operated.
If the pressing plate 24 is attached to the shoe 12 via a bearing 23 as shown in FIG. 5, the frictional resistance will be reduced, and when the shield jack 90 is pressing the segment 1, the shield jack 90 can be tilted at the same time.

Note that the cross-sectional shape of the shield frame 1 may be rectangular, polygonal, elliptical, or the like.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

The rolling angle detector detects the rolling angle of the shield frame, and the tilting cylinder controls the tilting angle of the shield jack for rolling correction based on the detected angle, thereby reducing the portion of the propulsive force in the shield frame circumferential direction. Since rolling is corrected by force, rolling can be easily and automatically corrected not only for shields with circular cross sections, but also for shields with cross sections other than circular.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a shield showing an embodiment of the present invention seen from the rear, Fig. 2 is a side view of a shield jack for rolling correction, Fig. 3 is a side sectional view of the shield, and Fig. 4 is a configuration diagram of a shield jack for rolling correction. 3 is a rear view of the shield, and FIG. 5 is a schematic side view of an improved shoe portion of the shield jack for rolling correction. In the figure, 1 is a shield frame, 7 is a segment, 19 is a tilting cylinder, and 90 is a rolling correction shield jack.

Claims (1)

[Scope of utility model registration request] A rolling angle detector detects the rolling angle of the shield frame, and a rolling angle detector is provided on the inner circumference of the shield frame so as to be tiltable in the tangential direction, and provides a propulsion force to the shield frame by the reaction force that presses the end of the existing segment. A rolling correction shield jack that applies rotational force; and a tilting jack that tilts the rolling correction shield jack to correct rolling of the shield frame based on the angle detected by the rolling angle detector. Features a shield rolling correction device.