JPH067115Y2 - Shield jack shoe steady rest device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a shield jack shoe steady rest device in which a shoe for transmitting a reaction force of a shield jack to a segment does not hit one side of the segment.

[Prior Art] An example of a conventionally used shield machine will be described with reference to FIG. 2. A shield machine a has a cutter b for excavating earth and sand while rotating, and the excavated earth and sand is fed by a screw conveyor c. After being discharged, the shield machine a receives thrust by the shield jack d and moves forward. Reference numeral e is a ring plate, and f is a segment that has been completely assembled. A rod g projecting from the rear end of the shield jack d receives a thrust reaction force from the segment f via a shoe h.

As shown in FIG. 3, a flange i is provided on the outer periphery of the rear end of the shield jack d, and this flange i is fixed to the ring plate e, and slidably projects from the rear end of the shield jack d. A spherical bearing j is provided at the tip of the rod g, and a shoe h is attached to the spherical bearing j. A pin k that allows the tunnel to rotate in the radial direction is connected to the shoe h and the spherical bearing j. Penetrates through.

When the shoe h rotates together with the rod g around the central axis of the rod g, the contact area between the shoe h and the segment f decreases and it becomes impossible to sufficiently support the reaction force.
In order to prevent rotation of the rod g, an anti-rotation rod l that moves in parallel with the rod g is coupled to the tip of the rod g so that the anti-rotation rod l penetrates the ring plate e closely and slidably. The rod g was prevented from rotating around the central axis.

[Problems to be Solved by the Invention] In the conventional rotation preventing rod l, since the ring plate e which is a separate body from the shield jack d must be densely penetrated, the rotation preventing rod l drilled in the ring plate e is It is difficult to obtain the accuracy of the position where the through hole is drilled because of the relation with the mounting position of the shield jack d, and it is difficult to assemble or remove the shield jack d.

In order to make the shoe h closely contact with the segment f, the spherical bearing j slightly swings in the radial direction of the tunnel about the pin k to change its direction. Since the shoe h tends to face downward, the corner portion of the shoe h sometimes hits the segment f and may damage the segment f.

The present invention solves the above-mentioned drawbacks of the prior art by preventing the rotation preventing rod from directly penetrating the ring plate, and preventing the shoe from being inclined downward by its own weight. It is intended to provide.

[Means for Solving the Problems] In the shield jack shoe steady rest of the present invention, a flange is provided on the outer periphery of the rear end of the shield jack, and a rotation-preventing rod that slidably penetrates the flange is provided at the rod tip of the shield jack. It is characterized in that an elastic body is inserted between the rod side end of the shoe which is connected to the side surface of the portion and is supported by the tip of the rod and the tip of the rod.

[Operation] The ring plate does not need to be provided with a through hole for penetrating the anti-rotation rod, and the elastic body prevents the runout of the shoe until it comes into contact with the segment.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a shield jack, and a flange 2 is integrally provided on the outer peripheral surface of the rear end thereof. A rod 3 slidably protruding from the rear end of the shield jack 1.
The tip of a rotation preventing rod 4 that moves in parallel with the rod 3 is coupled to the side surface of the. The rotation preventing rod 4 penetrates through the through hole 5 formed in the flange 2 in a slidable manner, and
Does not rotate around the central axis. The flange 2 of the shield jack 1 is fixed to the ring plate 6, and the ring plate 6 is provided with a hole 7 that allows both the shield jack 1 and the rotation preventing rod 4 to pass through loosely.

A spherical bearing 9 is provided at the tip 8 of the rod 3, and a shoe 10 is attached to this, and a pin 11 that allows the tunnel to rotate in the radial direction passes through the shoe 10 and the spherical bearing 9. There is. Between the rod-side end 12 of the shoe 10 and the tip 8 of the rod 3, a ring-shaped rubber or elastic body such as a spring is used.
When the shoe 13 is inserted and the shoe 10 is not in contact with the segment f (see FIG. 2), the shoe 10 does not tend to face downward due to its own weight, so that the shoe 10 has the entire circumference of the rod side end (12). It gives resilience over.

When the rod 3 slides to the right in FIG. 1, the rotation preventing rod 4 also closely slides in the through hole 5 and moves to the right. Therefore, the rod 3 should rotate about the central axis. Without extending, the shoe 10 comes into direct contact with the segment f. When the contact surface on the segment f side is slightly inclined, the elastic body 13 is locally distorted, so that the shoe 10
Therefore, the entire area of is closely contacted with the segment f and receives the reaction force of the shield jack.

[Effects of the Invention] Since the rotation preventing rod of the present invention penetrates the flange integrated with the shield jack, it is not necessary to accurately position the shield jack and the through hole when installing the shield jack. The position where the shield jack is attached to the ring plate does not require precision, and assembly and removal are easy.

Further, since the shoe is prevented from tilting by the elastic body in the state where the shoe is not in contact with the segment, the shoe comes into contact with the entire surface when the shoe starts contacting with the segment, so that the segment is not damaged.

[Brief description of drawings]

1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a vertical cross-sectional side view of a shield machine, and FIG. 3 is a cross-sectional view of a conventional device taken along line III-III in FIG. In the drawing, 1 is a shield jack, 2 is a flange, 3 is a rod, 4 is a rotation preventing rod, 5 is a through hole, 8 is a tip, 10 is a shoe, 12 is a rod side end, and 13 is an elastic body.

Claims (1)

[Scope of utility model registration request] 1. A shield provided with a flange on the outer periphery of the rear end of the shield jack, and a rotation-preventing rod slidably penetrating the flange is coupled to a side surface of a tip portion of the rod of the shield jack to support a shoe supported on the tip of the rod. A shield jack shoe steady rest, wherein an elastic body is inserted between a rod side end and a tip of the rod.