JPH0653694U - Tail seal for shield machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a tail seal for a shield machine, which is not deformed by high pressure and is not damaged by a step formed at a joint between segments. [Structure] A wire brush seal 4a, an inner protective plate 4b, and an outer protective plate 4c are formed, and the fixed end side is attached to the skin plate 1a of the shield body 1 via the cover plate 5, and the tip is approximately from the middle part In a tail seal of a shield machine whose side is bent inward, a reinforcing plate 4d is provided on the fixed end side of the inner protective plate 4b, and the tip of the inner cover plate 5 is extended to the vicinity of the bent portion and formed at the tip. The bent portion is supported from the inside by the small arc-shaped portion 5a, and the tip of the inner protection plate 4b is attached to the wire brush seal 4a.
Since the curved portion is curved to the side to form the arcuate portion 4e, and the bent portion is reinforced, it is less likely to be deformed by high pressure and is not damaged at the step 3b of the segment 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a tail seal provided in a shield machine.

[0002]

[Prior art]

 Conventionally, a shield machine for excavating a tunnel has a tail seal provided at the rear of the shield body. As shown in FIG. 1, the above-mentioned conventional tail seal has a structure in which an inner protection plate b is provided inside a wire brush seal a in which wire brushes are laminated in multiple stages, and an outer plate c is provided outside the seal. It is attached to the inner surface of the skin plate e of the shield body via the cover plate d. In addition, the approximately middle portion is bent inward in a substantially V shape, and the tip side is pressed against the outer circumference of the segment f by its own elasticity, and grease is injected under pressure into the wire brush seal a. By doing so, the water stop effect can be obtained.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional tail seal, when the shield body is retracted when the segment f is assembled, the tips of the wire brush seal a and the inner protective plate b are caught by the step g generated at the joint of the segment f, and these are early. There is a problem that it will be damaged. Also, if the shield body is retracted when the earth pressure or mud pressure of the ground is high, the tail seal will reverse warp due to the friction between the inner protection plate b of the tail seal pressed against the segment f and the segment f with high pressure. As a result, the wire brush seal a is rapidly worn and the water-stopping effect is reduced early. The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a tail seal for a shield machine, which does not damage the wire brush seal or the inner protective plate due to friction or catching with the segment. Is to be.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is composed of a wire brush seal, an inner protective plate and an outer protective plate, and the fixed end side is attached to the skin plate of the shield main body through the cover plate, and has a substantially intermediate position. In the tail seal of a shield machine, the tip side of which is bent inward from the section, a reinforcing plate is provided on the fixed end side of the above-mentioned inner protection plate, and the tip of the inner cover plate is extended to the vicinity of the bent part. The bent portion is supported from the inside by the small arc-shaped portion formed on the above, and the tip of the inner protection plate is curved toward the wire brush seal side to form the arc-shaped portion.

[0005]

[Action]

 With the above structure, since the bent portion is reinforced by the reinforcing plate and the small arcuate portion of the cover plate, it is not deformed or damaged even when a high pressure is applied. Even if the shield body retreats, the arcuate part at the tip of the inner protective plate gets over the step created at the seam of the segment, and the tip of the wire brush seal and the tip of the inner protective plate are caught in the step and damaged. It never happens.

[0006]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. 2 is a partially cutaway side view of the shield machine, and FIG. 3 is an enlarged sectional view of the tail seal. In FIG. 2, reference numeral 1 denotes a shield main body that advances under the ground, and a cutter head 2 that excavates a face in front of the shield main body 1 while rotating is provided at a front portion. Reference numeral 3 is a segment for lining the inner wall of the tunnel excavated by the shield body 1, and the tail seal 4 provided at the rear portion of the shield body 1 is pressed against the outer peripheral surface of the segment 3 to form a skin plate of the shield body 1. It prevents dirt, muddy water, etc. from entering the shield body 1 through the gap between the 1a and the segment 3.

As shown in FIG. 3, the tail seal 4 includes a wire brush seal 4a in which wire brushes are laminated in a plurality of layers, an inner protection plate 4b provided inside the wire brush seal 4a, and a wire brush seal 4a. The outer protective plate 4c is provided on the outer side of the. The inner and outer protection plates 4b, 4c are formed of a thin metal plate having elasticity to protect the wire brush seal 4a from early wear, and the inner protection plate 4b has a reinforcement plate 4d on the fixed end side. It is provided so as to be in close contact with the protection plate 4b.

On the other hand, the tail seal 4 is bent inward from the substantially middle portion in a letter shape, and the fixed end is sandwiched by the cover plate 5 from the vertical direction. The tip of the cover plate 5 provided on the inner side of the cover plate 5 extends to the vicinity of the bent portion of the tail seal 4, and is formed in a small arc shape having substantially the same curvature as that of the bent portion. The inner protection plate 4b is supported from the inner side by the portion 5a via the reinforcing plate 4d, and the tip of the inner protection plate 4b is curved in an arc shape toward the wire brush seal 4a side to form an arc-shaped portion 4e. The arcuate portion 4e prevents the tip of the wire brush seal 4a from catching on the step 3b formed in the joint 3a of the segment 3.

Further, the fixed end side of the tail seal 4 is attached to the inner peripheral surface of the skin plate 1a without any gap by fixing the cover plate 5 to the inner peripheral surface of the skin plate 1a by means such as welding. At the same time, grease is injected under pressure into the wire brush seal 4a. The arcuate portion 4e at the tip of the inner protective plate 4b is preferably R5 to R10 so that the step 3b of the segment 3 can be overcome. Further, the small arcuate portion 5a at the tip of the inner cover plate 5 is about R1 to R3.

Next, the operation will be described. When the shield body 1 is being dug, the tip of the tail seal 4 is pressed against the outer circumference of the segment 3 by its own elasticity, so that the soil and sand from the gap between the skin plate 1 a and the segment 3 are removed. It prevents mud from entering. Further, even if earth pressure or muddy water pressure is high and this pressure acts on the tail seal 4, the inner protection plate 4b is reinforced by the reinforcing plate 4d, and the bent portion is lowered by the small arc-shaped portion 5a of the cover plate 5. Since it is supported more, it will not be deformed against high pressure, and even if the shield body 1 is retracted when the segment 3 is assembled, the tip of the wire brush seal 4a has an arcuate portion 4e of the inner protection plate 4b. Therefore, the tip of the wire brush seal 4a is not caught by the step 3b formed at the joint 3a of the segment 3.

[0011]

[Effect of device]

 As described in detail above, this invention is such that the inner protective seal provided inside the wire brush seal is reinforced by the reinforcing plate, and the bent portion is supported from below by the small arc-shaped portion formed on the cover plate. As a result, the tail seal is not likely to be deformed or damaged even when high pressure is applied to the tail seal due to the bending of the bent portion that is the most deformable. In addition, since the tip of the inner protection plate is curved toward the wire brush seal side to form an arcuate part, the tip of the wire brush seal or the inner protection plate will not be affected by the step created at the segment joint even if the shield body retracts. You won't get caught. As a result, it is possible to eliminate problems such as rapid wear of the wire brush seal due to breakage of the inner protective plate, and early deterioration of the sealing function.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a conventional tail seal.

FIG. 2 is a partially cutaway side view of a shield machine having a tail seal according to an embodiment of the present invention.

FIG. 3 is a sectional view of a tail seal according to an embodiment of the present invention.

[Explanation of symbols]

 1 Shield body 1a Skin plate 4a Wire brush seal 4b Inner protection plate 4c Outer protection plate 4d Reinforcement plate 4e Arc-shaped part 5 Cover plate 5a Small arc-shaped part

Claims (1)

[Scope of utility model registration request] 1. A wire brush seal 4a, an inner protective plate 4b, and an outer protective plate 4c are formed. The fixed end side is attached to the skin plate 1a of the shield body 1 via the cover plate 5, and the intermediate portion is formed. In a tail seal of a shield machine in which the tip side is bent further inward, a reinforcing plate 4d is provided on the fixed end side of the inner protection plate 4b, and the tip of the inner cover plate 5 is extended to the vicinity of the bent portion. The bent portion is supported from the inside by the small arc-shaped portion 5a formed in
A tail seal for a shield machine, wherein the tip of the inner protection plate 4b is curved toward the wire brush seal 4a to form an arcuate portion 4e.