JPH0735595U - Shield excavator with simplified segment assembly - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a shield excavator in which a margin can be secured between the inner surface of the tail portion of the shield excavator and the outer surface of the segment, and the assembly of the segment is simplified. [Structure] The segment assembly step 4 is formed on the inner surface of the segment assembly portion of the shield tail portion 1 of the shield excavator.
Was set up.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shield excavator configured to facilitate the assembly of the segments on the inner surface of the tail portion of the shield machine.

[0002]

[Prior art]

 In the shield construction method, as shown in FIG. 4, several segments a are assembled into a ring shape in the tail part b of the shield excavator, and a reaction force is applied to the segment a by a shield jack mounted on the shield excavator. To advance the shield excavator. In the figure, c is a tail packing.

[0003]

[Problems to be solved by the device]

 However, when the route alignment is curved, the trajectory of the shield excavator and the alignment of the segment may not match. In this case, some deviation can be absorbed by increasing the tail inner diameter compared to the segment outer diameter, and the above-mentioned deviation can be absorbed by the margin t generated between the two, but as shown in FIG. In this case, the inner surface of the tail portion and the outer surface of the segment a come into contact with each other as shown by x, and it becomes difficult to assemble the next segment.

The allowance t in FIG. 4 is naturally determined from the relationship between the outer diameter of the shield excavator and the outer diameter of the segment. However, even if the above-mentioned conventional technique is carefully performed, This is a phenomenon that often occurs. The present invention has been proposed in view of the above problems of the prior art, and the purpose thereof is to always be able to secure a margin between the inner surface of the tail portion and the outer surface of the segment of the shield excavator. The point is to provide a shield excavator with simplified segment assembly.

[0005]

In order to achieve the above-mentioned object, a shield excavator according to the present invention in which assembly of a segment is simplified is provided on an inner peripheral surface of a segment assembly portion of a shield tail portion of the shield excavator. , A segment assembly step portion is provided.

[0006]

[Action]

 According to the present invention, as described above, by providing a step on the inner peripheral surface of the assembly portion of the shield tail portion of the shield excavator, a margin is secured between the inner surface of the shield tail portion and the outer surface of the segment, and at the time of segment assembly. , The outer surface of the same segment does not come into contact with the shield tail and does not hinder the assembly of the next segment, and it is possible to always secure a margin between the inner surface of the shield tail and the outer surface of the segment. .

[0007]

【Example】

The present invention will be described below with reference to the illustrated embodiments. Reference numeral 1 denotes a shield tail portion of the shield excavator, and the segments S _n-1 , S _n, S _{n + 1,} ... Are assembled inside the tail portion 1 as the excavator advances. ing. In the figure, 2 is a tail seal and 3 is a back-filling part. (See FIG. 1) A step 4 as shown in FIG. 2 is provided on the entire inner surface or a part of the inner surface of the tail portion 1. The step 4 may be a single step or a plurality of steps. In addition, the corner 4'formed by the step 4 may be a right angle or a taper, or may form an arc as shown.

Further, the step 4 may be provided over the entire circumference of the inner surface of the tail portion, or may be provided on a part thereof, and furthermore, the step may be provided continuously or intermittently. May be provided.

[0009]

[Effect of device]

 As mentioned above, the shield construction method is constructed so that the segmented segments are assembled in the shield tail section of the shield excavator, and the segment is pushed out of the machine through the shield jack to obtain advance of the shield excavator. However, the trajectory of the shield excavator and the alignment of the segment do not match, and the inner surface of the shield tail and the outer surface of the segment contact each other, often making it difficult to assemble the next segment.

However, in the present invention, as described above, by providing the step portion on the inner peripheral surface of the segment assembly portion in the shield tail portion, it is possible to secure a space required for the segment to be assembled next, Makes segment assembly easier. Further, according to the present invention, as described above, the shield tail portion is provided with the step portion for segment assembly, so that the shield excavator required to secure a margin for segment assembly in the shield tail portion. The outer diameter can be reduced, and the shield excavator according to the present invention can reduce the outer diameter as compared with the conventional shield excavator having the same segment diameter, which improves the economical efficiency.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a main part of a shield excavator in which assembly of a segment according to the present invention is simplified.

FIG. 2 is an enlarged vertical side view showing a stepped portion of a shield tail portion.

FIG. 3 is a partial vertical cross-sectional side view showing a segment assembled state of the shield tail portion of the shield excavator according to the present invention.

FIG. 4 is a vertical cross-sectional side view showing the relationship between the shield tail portion and the segment during the excavation of the shield excavator.

FIG. 5 is a vertical cross-sectional view showing a state where contact is made between the shield tail portion and the segment during the excavation of the shield excavator.

[Explanation of symbols]

1 Shield tail part of shield excavator 2 Tail seal 3 Backfill part 4 Step 4'Step angle S _n-1 segment S _n segment S _{n + 1} segment

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Koji Oka 2-10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Co., Ltd. (72) Creator Fumihiko Yoda 2-3-5 Misaki-cho, Chiyoda-ku, Tokyo No. Iron Construction Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A shield excavator in which segment assembly is simplified, wherein a segment assembly step portion is provided on an inner peripheral surface of a segment assembly portion in a shield tail portion of the shield excavator.