JPH078631Y2 - Water stop device for shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a water stop device for a shield machine, which prevents muddy water from entering the shield machine when the tail seal of the shield machine is damaged. Is.

[Prior Art] Referring to FIG. 6, the rear end of the shield machine will be described.
Reference numeral 1 is a tail skin plate of a shield machine, 2 is a propulsion jack, 3 is a jack shoe, and a rubber plate 4 having the same shape as the jack shoe 3 as seen from the back side is attached to the back surface of the jack shoe 3. Cage, propulsion jack 2
When extended, the jack shoe 3 presses the assembled segment 5 via the rubber plate 4 to obtain a propulsive force. This rubber plate 4 has a non-slip and a segment 5
It is attached to the back surface of the jack shoe 3 in order to prevent the damage. A tail seal 6 is attached to the inner peripheral surface of the tail skin plate 1 to seal between the inner surface of the tail skin plate 1 and the outer periphery of the segment 5, and the shield digging is performed from between the tail skin plate 1 and the segment 5. Prevents muddy water from entering the plane.
When the tail seal 6 is broken in such a shield machine, muddy water comes into the shield machine.

Therefore, in order to prevent muddy water from entering the shield machine even when the tail seal 6 is damaged, conventionally, when the rubber tube 7 is attached to the inner peripheral surface of the tail skin plate 1 in a ring shape and the tail seal 6 is damaged. At this time, a pressure fluid such as pressure air is introduced into the rubber tube 7 to expand the rubber tube 7 so that the inner circumference of the rubber tube 7 is brought into close contact with the outer circumference of the segment 5 and muddy water enters the shield machine. I was trying not to.

[Problems to be Solved by the Invention] In such a conventional water stop device for a shield machine, when the rubber tube 7 is inflated, earth and sand are caught between the rubber tube 7 and the segment 5, and In some cases, the inner circumference of the rubber tube 7 was wrinkled and the inner circumference of the rubber tube 7 did not come into close contact with the outer circumference of the segment 5, so that the water blocking effect could not be sufficiently achieved.

The present invention does not use the rubber tube 7 like the conventional one,
An object of the present invention is to provide a water stop device for a shield machine, which can prevent muddy water from entering the shield machine when the tail seal 6 is damaged.

[Means for Solving the Problems] A water stop device for a shield machine according to the present invention is configured such that an edge of a rubber plate attached to the back surface of each jack shoe of a propulsion jack of the shield machine is thin, and an outer edge of the rubber plate is formed. The parts are in close contact with the inner surface of the tail skin plate of the shield machine, and the side edges of adjacent rubber plates overlap each other.

[Operation] Since the outer edge of the rubber plate is always in close contact with the inner surface of the tail skin plate of the shield machine, even if the tail seal is damaged, muddy water will enter the shield machine inside the rubber plate. Does not penetrate.

Also, since the side edges of the rubber plate are thin and overlap with the side edges of the adjacent rubber plate, the side edges of the rubber plate should not be used when the propulsion jacks are sequentially expanded and contracted during normal segment assembly. It does not hinder the expansion and contraction of the adjacent propulsion jack.

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

FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view of the same.
A tail seal 6 similar to that shown in FIG. 6 is attached to the outer peripheral surface of the segment 5 but is not shown in FIG. Reference numeral 2 is a propulsion jack, 3 is a jack shoe, the jack shoe 3 is separated from the tail skin plate 1 as shown in FIG. 4, and the adjacent jack shoes 3 are also separated from each other.

A rubber plate 8 having a shape larger than that of the jack shoe 3 is attached to the back surface of the jack shoe 3, and an outer edge portion 9 on the outer side of the rubber plate 8 is a tail skin plate as shown in FIGS. 2 and 3. The side edges 10 in close contact with the inner surface of No. 1 and in the circular direction as shown in FIGS. 1 and 3 overlap with the side edges 10 of the adjacent rubber plates 8. These edges 9,10
Is a single-sided taper as shown in Figs. 1 and 2,
As shown in FIG. 5, it is thinned by providing a double-sided taper so as to be easily bent.

In order to assemble the segment 5, when a part of the propulsion jack 2 is contracted, the rubber plate 8 attached to the back surface of the jack shoe 3 of the contracted propulsion jack 2 and the back surface of the jack shoe 3 of the propulsion jack 2 which is not contracted. The side edges 10 at the boundary with the attached rubber plate 8 are bent to each other so that the rubber plate 8 of the propulsion jack 2 to be reduced is separated from the rubber plate 8 of the non-reduced propulsion jack 2 and the jack 2 to be reduced. The outer edge portion 9 of the rubber plate 8 slides while being in close contact with the inner surface of the tail skin plate 1.

When the assembly of one ring of the segment 5 is completed, all the propulsion jacks 2 are extended all at once to advance the shield machine.

At this time, the side edges 10 of all the rubber plates 8 overlap each other and remain in close contact with each other, while the outer edges 9 slide in close contact with the inner surface of the tail skin plate 1.

When it is advanced with the shield machine, the tail skin plate 1 and the tail seal 6 (see FIG. 6) are separated by the segment 5
Since it slides on the outer circumference of the tail seal 6, the tail seal 6 is often damaged at this time. However, at this time, as described above, the side edges 10 of all the rubber plates 8 are in close contact with each other and the outer edges 9 are in close contact with the inner surface of the tail skin plate 1, so that the tail seal 6 The muddy water that has entered between the tail skin plate 1 and the segment 5 due to the damage of is blocked by the rubber plate 8 from entering the shield machine.

[Advantage of the Invention] The present invention can prevent muddy water from entering the shield machine when the tail seal is damaged by the rubber plate attached to the back of the jack shoe. No need to attach to.

In addition, since the thin outer edge of the rubber plate is always in close contact with the inner surface of the tail skin plate, earth and sand do not get caught between the tail skin plate and the rubber plate, and the close contact is always maintained. Since the plate is divided for each jack shoe, the rubber plate does not cause wrinkles on the outer edge portion in contact with the tail skin plate, and reliable water stopping can be expected.

Further, since the overlapping side edge portions of the adjacent rubber plates are thin and easily bendable, even when the propulsion jacks are individually expanded and contracted, there is no obstacle to the individual expansion and contraction of the propulsion jacks.

[Brief description of drawings]

1 is a plan view of an embodiment of the present invention, FIG. 2 is a vertical sectional view of FIG. 1, FIG. 3 is a rear view of a rubber plate when FIG. 1 is viewed from the right side, and FIG. 4 is a jack. FIG. 5 is a rear view of the shoe, FIG. 5 is a sectional view of another embodiment of the rubber plate, and FIG. 6 is a vertical sectional view of a conventional device. In the figure, 1 is a tail skin plate, 2 is a propulsion jack,
3 is a jack shoe, 8 is a rubber plate, 9 is an outer edge portion, and 10 is a side edge portion.

Continuation of front page (72) Inventor Toshio Suzuki 13, Showa-cho, Minato-ku, Nagoya, Aichi Prefecture Ishikawajima Harima Heavy Industries, Ltd. Nagoya factory (56) Reference JP 61-78996 (JP, A) JP HEI 1- 146096 (JP, A) Actual development Sho 58-189291 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An edge of a rubber plate attached to the back surface of each jack shoe of each jack of a shield machine is thin, and the outer edge of the rubber plate is in close contact with the inner surface of the tail skin plate of the shield machine. A water stop device for a shield machine, wherein side edges of adjacent rubber plates overlap each other.