JP7366502B2 - How to handle shield tunneling machine - Google Patents

Description

The present invention relates to a method of handling a shield tunneling machine.

Traditionally, shield tunnel excavators that excavate tunnels have been able to be folded in the middle between the front and rear bodies, and the seal plate on the rear body has a structure that combines segments and seal plates that are assembled inside the rear body. A plurality of tail seals are attached to seal between the two. For example, Patent Document 1 discloses a shield tunneling machine in which three tail seals are attached to a seal plate.

Patent No. 3044335

The tail seals mentioned above are generally wire brushes. When three or more tail seals are attached to the seal plate of a shield tunneling machine, short tail seals are typically used for the front and middle tail seals, and long tail seals are used for the last tail seal.

By the way, some tunnels have a mixture of steep curve sections and high water pressure sections. Here, the "steep curve section" is a section where the radius of curvature of the tunnel is 30 times or less the horizontal width (diameter in the case of a circular cross section) of the shield tunneling machine, and the "high water pressure section" is This refers to an area where the water pressure is 0.4 MPaG or higher.

When excavating such a tunnel, if the front tail seal and middle tail seal are short and the last tail seal is long as described above, when the shield excavator excavates a sharp curve section, the front tail seal The length of the seal (the length of the part pressed against the segment) is shortened, causing problems with water-stopping properties. From this point of view, it is conceivable to increase the length of the foremost tail seal.

On the other hand, when the shield tunneling machine excavates a high water pressure section, three tail seals are not sufficient, so it is desirable to have four or more tail seals. However, the length of the seal plate is limited by the minimum radius of curvature of the sharp curve section, so if the length of the frontmost tail seal is increased as described above, the number of tail seals must be four or more. difficult to do.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for handling a shield excavator that is suitable for excavating a tunnel in which a sharp curve section and a high water pressure section coexist.

In order to solve the above problems, a method for handling a shield tunneling machine according to the present invention is a method for handling a shield tunneling machine in which three or more tail seals are attached to the seal plate of the rear body, comprising:
When the shield tunneling machine excavates a sharply curved section, the three or more tail seals include the foremost tail seal having a first length and at least one tail seal having a second length shorter than the first length. When the shield excavator excavates a high water pressure section by using a middle stage tail seal and a last stage tail seal having a third length longer than the second length, the second tail seal is used as the three or more tail seals. The present invention is characterized in that a front-most tail seal and at least two middle-stage tail seals of a length, and a last-stage tail seal of the third length are used.

According to the above configuration, when the shield tunneling machine excavates a sharply curved section, a long tail seal is used as the frontmost tail seal, so the hanging allowance of the frontmost tail seal becomes longer, and sufficient water-stopping performance is ensured. can be secured. On the other hand, when the shield tunneling machine excavates a high water pressure section, the frontmost tail seal is replaced with a shorter tail seal, and the number of tail seals is also increased. Therefore, sufficient water-stopping performance can be ensured even in high water pressure sections. That is, the method for handling a shield tunneling machine according to the present invention is suitable for excavating a tunnel that includes both steeply curved sections and high water pressure sections.

The seal plate has at least four seal mounting portions arranged in the front-rear direction and at least three greasing ports located between them, and when the shield excavator excavates the sharply curved section, A tail seal is not attached to the second seal attaching portion from the front among the at least four seal attaching portions, and one greasing port adjacent to the seal attaching portion to which the tail seal is not attached among the at least three greasing ports is provided. The grease port is closed and grease is supplied from the remaining grease ports to the seal chamber between the tail seals, and when the shield excavator excavates the high water pressure section, grease is supplied from all of the at least three grease ports. Grease may be supplied to the seal chamber between the tail seals. According to this configuration, the amount of grease consumed can be suppressed compared to the case where grease is supplied from all the greasing ports when the shield tunneling machine excavates a sharply curved section.

According to the present invention, there is provided a method for handling a shield excavator that is suitable for excavating a tunnel in which a sharp curve section and a high water pressure section coexist.

FIG. 2 is a cross-sectional view when a shield excavator, which is a target of a handling method according to an embodiment of the present invention, excavates a sharply curved section. FIG. 2 is an enlarged view of the main part of FIG. 1. FIG. FIG. 2 is a cross-sectional view when the shield excavator shown in FIG. 1 excavates a high water pressure section. 4 is an enlarged view of the main part of FIG. 3. FIG.

FIG. 1 shows a shield tunneling machine 1 that is the subject of a handling method according to an embodiment of the present invention. The shield excavator 1 includes a cutter head 11 that excavates the ground, a cylindrical front body 12 that rotatably supports the cutter head 11 via a bulkhead (not shown), and a front body 12 that is connected to the front body 12 through a center bending mechanism. It includes a cylindrical rear body 13 connected to.

A plurality of shield jacks 16 are provided at the front part of the rear body 13 for pushing the segments 5 assembled inside the rear body 13 to move the shield excavator 1 forward. The rear body 13 includes a skin plate 14 on the front side and a seal plate 15 on the rear side.

Three or more tail seals 2 are attached to the seal plate 15. Tail seal 2 seals between segment 5 and seal plate 15. This prevents the backfilling material injected into the tail void (the gap between the earth and the segment 5) at the rear of the rear shell 13, ground water, muddy water, etc. from entering the rear shell 13. The tail seals 2 are annular and lined up in the axial direction (front-rear direction) of the rear body 13. The tail seal 2 is, for example, a wire brush.

In this embodiment, as shown in FIG. 1, when the shield excavator 1 excavates a sharply curved section, three tail seals 2 are attached to the seal plate 15, and as shown in FIG. When excavating a hydraulic section, four tail seals 2 are attached to the seal plate 15.

Note that the sharp curve section is also a low water pressure section, and the high water pressure section is also a gentle curve section (section where the radius of curvature of the tunnel is relatively large). When the shield tunneling machine 1 excavates a section that is neither a sharp curve nor a high water pressure section (for example, a slow curve and low water pressure section), the tail seal 2 should be installed in either the manner shown in Fig. 1 or Fig. 3. You can.

2 and 4 are enlarged views of the main parts of FIGS. 1 and 3, respectively. However, in FIGS. 2 and 4, the segments 5 are drawn as straight lines for the purpose of simplifying the drawings.

In this embodiment, the seal plate 15 has four seal attachment portions 2a to 2d arranged in the front-rear direction, as shown in FIG. A tail seal 2 can be attached to these seal attachment parts 2a to 2d.

Further, the seal plate 15 is provided with three greasing ports 41, 43, and 45 located between the seal mounting portions 2a to 2d, and communicates with these greasing ports 41, 43, and 45, respectively. Three greasing passages 42, 44, 46 are provided.

When the shield excavator 1 excavates a sharply curved section, as shown in FIG. A middle tail seal 22 with a relatively short second length (shorter than the first length) is attached to the second seal attachment portion 2c, and a relatively long (second length) tail seal 22 is attached to the rearmost seal attachment portion 2d. The last stage tail seal 23 of the third length (longer than the length) is attached. In other words, no tail seal is attached to the second seal attaching portion 2b from the front. Note that the first length and the third length may be the same or different.

Due to the mounting manner of the tail seal 2 described above, a relatively large seal chamber 31 is formed between the foremost tail seal 21 and the middle tail seal 22, and a relatively large seal chamber 31 is formed between the middle tail seal 22 and the last tail seal 23. A relatively small sealing chamber 32 is formed.

Further, one of the greasing ports 41 and 43 adjacent to the seal attachment portion 2b to which the tail seal 2 is not attached, which communicates with the relatively large seal chamber 31, is closed by the plug 40. In the illustrated example, the greasing port 43 is closed, but the greasing port 41 may be closed instead of the greasing port 43. Grease is supplied from the greasing port 41 to the seal chamber 31, and at the same time, grease is supplied from the greasing port 45 to the seal chamber 32.

On the other hand, when the shield excavator 1 excavates a high water pressure section, as shown in FIG. A relatively short second length of the foremost tail seal 24 is attached. Further, a middle tail seal 25 having a relatively short second length is attached to the second seal attaching portion 2b from the front. The tail seals 2 attached to the second seal attachment part 2c from the rear and the rearmost seal attachment part 2d are the same as those used when the shield excavator 1 excavates a sharply curved section.

Due to the mounting manner of the tail seal 2 described above, a relatively small seal chamber 33 is formed between the foremost tail seal 24 and the middle tail seal 25, and a relatively small seal chamber 33 is formed between the middle tail seals 25 and 22. A small seal chamber 33 is formed. The seal chamber 32 between the middle stage tail seal 22 and the last stage tail seal 23 is the same as when the shield excavator 1 excavates a sharply curved section.

When the shield excavator 1 excavates a high water pressure section, the plug 40 is removed from the greasing port 43, and all the greasing ports 41, 43, and 45 are opened. Grease is supplied from all the greasing ports 41, 43, 45 to the seal chambers 33, 34, 32, respectively.

As explained above, in the handling method of the shield tunneling machine 1 of the present embodiment, when the shield tunneling machine 1 excavates a sharply curved section, a long tail seal is used as the frontmost stage tail seal 21. The hanging allowance of the tail seal 21 becomes longer, and sufficient water-stopping performance can be ensured. On the other hand, when the shield excavator 1 excavates a high water pressure section, the foremost tail seal 21 is replaced with a shorter tail seal 24, and the number of tail seals 2 is also increased. Therefore, sufficient water-stopping performance can be ensured even in high water pressure sections. That is, the handling method of the shield tunneling machine 1 of this embodiment is suitable for excavating a tunnel in which a sharp curve section and a high water pressure section coexist.

In addition, in this embodiment, since the greasing port 43 is blocked when the shield excavator 1 excavates a sharply curved section, all the greasing ports are closed when the shield excavator 1 excavates a sharply curved section. Compared to the case where grease is supplied from 41, 43, and 45, the amount of grease consumed can be suppressed.

(Modified example)
The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the present invention.

For example, the number of seal plates 15 attached to the seal plate 15 is four or more when the shield excavator 1 excavates a sharply curved section, and five or more when the shield excavator 1 excavates a high water pressure section. There may be.

1 Shield tunneling machine 13 Rear body 15 Seal plate 2 Tail seal 21, 24 First stage tail seal 22, 25 Middle stage tail seal 23 Last stage tail seal 2a to 2d Seal mounting part 31 to 34 Seal chamber 41, 43, 45 Greasing port

Claims (2)

A method of handling a shield tunneling machine in which three or more tail seals are attached to a seal plate of a rear fuselage, the method comprising:
When the shield tunneling machine excavates a sharply curved section, the three or more tail seals include the foremost tail seal having a first length and at least one tail seal having a second length shorter than the first length. Using a middle stage tail seal and a last stage tail seal having a third length longer than the second length,
When the shield excavator excavates a high water pressure section, the three or more tail seals include the foremost tail seal of the second length, at least two middle tail seals of the second length , and the third tail seal of the second length. How to handle a shield excavator using the last stage tail seal of 3 lengths.
The seal plate has at least four seal mounting portions lined up in the front-rear direction and at least three greasing ports located between them,
When the shield tunneling machine excavates the sharply curved section, the tail seal is not attached to the second seal attachment part from the front among the at least four seal attachment parts, and the tail seal is not attached to the second seal attachment part from the front among the at least four seal attachment parts, and the tail seal is not attached to the second seal attachment part from the front among the at least four seal attachment parts, and closing one greasing port adjacent to the seal attachment portion where the tail seal is not attached, and supplying grease from the remaining greasing ports to the seal chamber between the tail seals;
The shield tunneling machine handling method according to claim 1, wherein when the shield tunneling machine excavates the high water pressure section, grease is supplied from all of the at least three greasing ports to the seal chamber between the tail seals.

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