JP3437278B2 - Shield excavator tail seal replacement method and tail seal replacement device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for exchanging a tail seal detachably provided on an inner peripheral surface of a tail plate at the rear of a shield machine and an existing segment so as to seal the space therebetween. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, a tail seal of this type has been worn by friction with a seam portion of a segment, friction with sand or sand that has been caught between the segment and the tail seal, or friction with a back-filling injection agent that has entered. In order to withstand the above, natural rubber reinforced with steel cord and a combination of this with a wire brush are used. In addition, the tail seal itself is also installed in multiple stages in consideration of the durability and waterproofness.

When excavating a tunnel over a long distance, it is necessary to replace a tail seal damaged by wear or the like. As a method for replacing the tail seal, a chemical injection method or a freezing method which is generally used in a conventional shield method is used. As disclosed in Japanese Patent Laid-Open No. 2-157397, a method of solidifying and exchanging the ground behind the shield machine by a pneumatic method or the like, as disclosed in JP-A-2-157397, a detachable tail is attached to the inner surface of the tail plate of the shield machine. Attach the seal, and when replacing it, remove the attachment of the tail shield to the tail plate, advance the shield machine with the tail seal left on the outer periphery of the existing shield, and add a new one before the tail plate comes out of the existing shield. There is known a method of attaching a different tail seal to the inner surface of the tail plate.

[0004]

However, the above-mentioned method of replacing the tail seal for solidifying the ground requires a large amount of equipment, and moreover, the pipe is inserted into the ground from several places in the shield machine or the segment to carry out the solidification treatment. Therefore, there is a drawback that the ground in a predetermined area cannot be uniformly and coagulated in a short time. Further, according to the method disclosed in Japanese Patent Laid-Open No. 2-157397, when the tail seal is replaced,
The tail plate and existing segments are only partially polymerized and are not well suited for replacement under high pressure conditions, eg deep underground. In addition, in any of the above cases, the damage or wear of the tail seal cannot be confirmed, and the tail seal is suddenly replaced when damage occurs and shield excavation cannot be performed, so the process will also go crazy and the construction It was desired to exchange them systematically in line with the progress.

The present invention proposes a method for replacing a tail seal safely and inexpensively in a short time, a method for confirming a damaged state of the tail seal and replacing the tail seal, and implementing the method. The purpose of the present invention is to provide an exchange device suitable for the above.

[0006]

According to the present invention, there is provided a method for exchanging a tail seal detachably provided on an inner peripheral surface of a tail plate for sealing between a tail plate behind a shield machine and an existing segment. In this case, an inspection segment having an inspection hole for the tail seal is provided subsequent to the existing segment to advance the shield machine, and an injection port for a water blocking material that communicates with the inside and outside of the inspection segment is provided. Work for separating the tail seal from the tail plate following the sealed segment by providing a shielded segment having a movable sealing member that opens outward by injecting a water blocking material and advancing the shield machine A work segment having a mouth is provided to advance the shield machine, and a water blocking material is injected between the tail segment and the inlet of the sealable segment. After that, a work for separating the tail seal from the tail plate is performed from the work port, and a disassembling temporary propulsion segment is attached to the work segment via an extrusion plate that pushes the tail seal backward, and then the shield excavation is performed. The object of the above method was achieved by advancing the machine, disassembling the temporary propulsion segment, pushing the tail seal backward, and attaching and fixing a new tail seal to the inner surface of the removed tail plate. . Instead of the inspection segment and the segment with a seal, the inspection with a seal provided with an inspection hole of the tail seal, an inlet for a waterproof material communicating with the inside and outside, and a movable seal member that opens outward by the injection of the waterproof material Even if you use the segment for
The object of the above method can be achieved. This replacement method includes an inspection segment having an inspection hole for the tail seal provided with a transparent window, a water-stop material injection port communicating with the inside and outside provided next to the inspection segment, and an injection of the water-stop material. A segment with a seal, the segment having a movable seal member that opens outwardly by means of: a working segment having a working port that is provided subsequent to the segment and separates the tail seal from the tail plate; By using an exchanging device which is attached to the front of the pusher and pushes out the tail seal backward, and a disassembling temporary propulsion segment which is provided subsequent to the extruding plate, or the inspection segment and Instead of the segment with a seal, an inspection hole of the tail seal provided with a transparent window and an injection port for a waterproof material communicating with the inside and outside and With inspection segment with seal with a movable sealing member to open outward by the injection of water stopping material can be properly implemented.

[0007]

[Operation] Assemble the segment behind the shield machine,
Tunnel excavation is performed by advancing the shield machine, but when it is time to replace the tail seal, an inspection segment is provided following the existing segment to advance the shield machine (Fig. 3). . With this forward movement, the tail seal moves along the outer periphery of the inspection segment, but at that time, the damaged state of the tail seal can be confirmed from the inspection hole provided in the inspection segment, and the damaged state to be replaced. Then, a segment with a seal is provided following the inspection segment to advance the shield machine (FIG. 4). Then, a work segment is provided subsequent to the seal segment, and the shield machine is advanced until the work port of the work segment reaches a position where the work of releasing the tail seal can be performed, and a stop connecting the inside and outside of the seal segment is stopped. Injecting a waterproof material from the water material inlet to seal the space between the tail plate and the segment and the outer periphery of the segment with seal with the movable seal member and the waterproof material, and then remove the tail seal from the tail plate. Do (Figure 7). When this work is completed, an extrusion plate and a temporary propulsion segment are provided following the work segment, and the shield machine is advanced. The tail seal released from the tail plate by this forward movement is blocked by the push-out plate and remains on the outer periphery of the work segment, and when the tail plate comes to the outer periphery of the temporary propulsion segment, the forward movement is stopped and the temporary propulsion is performed. The segment for use is disassembled, the extrusion plate is also removed if necessary, and a new tail seal is attached to the exposed inner surface of the tail plate (Fig. 9). At this time,
Since the outer periphery of the work segment is sufficiently sealed with a tail seal and a water blocking material, it is possible to prevent water from entering the inside of the tunnel even if the natural pressure is high. Finally, a normal segment is provided following the working segment, and thereafter, normal shield excavation is performed.

The time required for replacing the tail seal is the total time of assembling and disassembling the various replacement segments, the time for injecting and solidifying the waterproofing material, and the time for the shield machine to advance the various segments for replacement. Almost the same, the replacement work can be completed safely in a relatively short time. Further, since the damaged state of the tail seal can be confirmed through the inspection segment, it is advantageous that the relationship between the digging time and the damage can be grasped to predict the next replacement of the tail seal.

[0009]

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 is a shield machine, 2 is a cylindrical tail plate extending behind the shield machine 1, a segment 3 is assembled inside the shield machine 1, and the segment 3 is assembled. When the shield jack 4 backed up is extended, the shield machine 1 advances. On the inner surface of the tail plate 2, a tail seal 5 that seals between the outer circumference of the existing segment 3 and the outer circumference of the existing segment 3 is detachably attached with countersunk bolts 6. The tail seal 5 has an annular shape in which seal members 5a curved in an arc shape in the width direction as shown in FIG. 11 are continuously arranged in the width direction and upper and lower surfaces thereof are fixed by base plates 7a and 7b as shown in FIG. The seal member 5a has a structure in which the inner and outer surfaces of the bundled wire brushes 5b are protected by a metal plate 5c and a water-impermeable material such as natural rubber is filled between the wire brushes 5b. A wire mesh may be sandwiched between 5b. Further, the tail seal 5 is provided with two or more stages as shown in FIG. 1 when excavating a large depth or excavating a high water pressure zone.

The tail seal 5 is worn out due to friction with the seam of the segment 3 and needs to be replaced.
At that time, first, as shown in FIG. 2, the tail seal 5
The inspection segment 9 having the inspection hole 8 is provided in succession to the existing segment 3, the shield machine 1 is moved forward, and the attachment state and wear state of the tail seal 5 are observed from the inspection hole 8 as shown in FIG. To do. The inspection segment 9 is formed by annularly connecting a plurality of curved segment members 9a with lenses 8a fitted in the inspection holes 8 on the natural ground side, as shown in FIGS. 12 and 13, for example.

When it is confirmed that the tail seal 5 should be replaced, a seal segment 10 is provided following the inspection segment 9 as shown in FIG.
Are advanced as shown in FIG. For example, as shown in FIGS. 14 to 16, the sealable segment 10 is provided with a water blocking material injection port 11 that communicates with the inside and outside and a movable sealing member 12 that opens outward on the natural ground side by injecting the water blocking material. The curved segment member with a seal 10a is assembled in an annular shape, and in the illustrated example, a large number of injection ports 11 provided with plugs are provided in two rows in the circumferential direction at intervals. In the example of FIG. Stud bolts 12a and 12a are provided outside the inlet 11, respectively.
Then, the movable seal member 12 made of metal such as stainless steel whose one side was fixed to the segment member 10a was fixed. The movable seal member 12 is attached such that the movable seal member 12 and the adjacent one are partially overlapped with each other as shown in FIG. 15, and the length of the movable seal member 12 is
It was set so as to have a length to sufficiently close the tail void 13 generated behind the tail plate 2 and the tail seal 5 when opened by the injection pressure of the water blocking material as shown by the chain line in FIG. The injection port 11 is provided with an injection plug 11a and a check valve 11b for preventing water from entering from the outside. As shown in FIG. 5, when the tail seal 5 is located at the position facing the segment 10 with the seal, and when the tail seal 5 is in a badly damaged state and leaks water, a water blocking material is used for the inlet 1.
Inject from 1 and take temporary measures to prevent water leakage. The movable seal member 12 is provided so as to open in the traveling direction of the shield machine 1.

In the state shown in FIG. 5, a working segment 14 is provided following the sealed segment 10. The working segment 14 is slightly shorter in length than the other segments.
A curved segment member 14a having a rectangular work opening 15 such as 7 or a steel plate 16 provided with a work opening 15 such as a circular shape as shown in FIG. It is used by connecting 14a in a ring shape.

After the working segment 14 is provided, the shield machine 1 is moved forward to position the working segment 14 so as to face the tail seal 5 as shown in FIG. Then, the water blocking material 17 is injected from the injection port 11 of the previously-provided sealable segment 10. The water stop material 17 opens the movable seal member 12 by the injection pressure, and seals the gap between the tail plate 2 and the work segment 14 and the ground in front of this gap and the segment with seal 10. When the water blocking material 17 is solidified, the tail plate 2 is passed through the working port 15.
Then, the flat head bolt 6 for fixing the tail seal 5 is removed, and the shield bolt excavator 1 is advanced a little to advance the pushing plate 18 and the temporary propulsion segment 19 to the front end of the working segment 14 as shown in FIG. Attach and further move the shield machine 1 forward. As a result, the separated tail seal 5 is left outside the work segment 14 as shown in FIG. 8, and the provisional propulsion segment 19 is disassembled and removed, and the push plate 18 is also removed to expose the tail plate 5 exposed in the tunnel. By attaching a new tail seal 20 to the inner surface of 2, the replacement work of the tail seal is completed. After that, as shown in FIG. 10, the normal segment 3 is provided following the work segment, the waterproof segment 17 is sufficiently filled from the sealable segment 10, and normal shield excavation is performed. Working port 15 of the working segment 14
Is closed by a suitable means and is reinforced with steel or the like, and then is poured into concrete to be constructed in the same manner as a normal segment.

In the above embodiment, separate segments are used for the inspection segment 9 and the seal-equipped segment 10. However, as shown in FIG. 19, a waterproof material injection port 11 and a movable seal member are provided behind the inspection hole 8. It is also possible to use the inspection segment with seal 21 provided with 12 instead of the inspection segment 9 and the segment with seal 10. In this case, the assembly time of one segment and the shield machine are more than those of the above-mentioned embodiment. The promotion time for one segment can be shortened.

Further, in the above embodiment, the movable seal member 12
Although embedded in the segment, one end may be fixed with a bolt 22 as shown in FIG. 20, or the end may be fixed to the end face of the segment with a bolt 22 as shown in FIG.
If there is no abnormality in the tail seal in the inspection from the inspection hole, you can install a normal segment after the inspection segment and perform normal shield excavation, and actually check the damage state of the tail seal to be left behind. As a result, a planned replacement plan can be set, and the delay in the process due to the failure of the tail seal can be prevented.

Further, as shown in FIGS. 22 and 23, the segment members with a seal 10a constituting the segment with a seal 10 are arranged in two rows along the circumferential direction of the segment member 10a so as to overlap each other. The root of each of the plurality of movable seal members 12 made of metal is fixed near the side edge in the width direction of the segment member 10a.
The injection port 11 of the water blocking material which penetrates 0a inward and outward may be formed at a position facing the movable seal member 12 and a position not facing the movable seal member 12. In this case, as the movable seal member 12, the one in the front row in the traveling direction of the shield machine 1 is provided on the inner side in contact with the outer surface of the segment member 10a,
Those in the rear row in the traveling direction are provided so as to be overlapped on the outer side thereof, and by injecting the water blocking material 17 from each of the inlets 11, these movable seal members 12 bulge outward to the natural ground and in the meantime. Can be completely sealed. In addition, in the example of FIG. 23, three sets of the segment 10 with a seal are provided, and the space between the ground and the ground is triple-sealed behind the shield tail.

[0017]

As described above, according to the present invention, the tail seal detachably provided on the inner peripheral surface of the tail plate of the shield machine is replaced with an inspection segment having an inspection hole following the existing segment. Is provided to advance the shield machine, and subsequently, a shielded segment is provided by providing a sealable segment having an inlet for a water blocking material and a movable seal member that opens outward by the injection, After the segment with a seal is provided with a working segment having a working opening for separating the tail seal, the shield machine is moved forward, and after the waterproof material is injected from the inlet of the sealed segment, the tail seal is removed. The work for separating is performed from the work port, and a temporary propulsion segment that can be disassembled is attached to the work segment via an extrusion plate, and then the shield machine By moving forward, disassembling the temporary propulsion segment, and attaching and fixing a new tail seal to the inner surface of the tail plate from which the tail seal has been removed, it is possible to confirm the damaged state of the tail seal to be left and replace it, There is an advantage that information on planned replacement can be obtained and unnecessary replacement is eliminated.Since the movable seal member and the water blocking material seal between the tail plate and the segment, the tail can withstand deep underground and high pressure water safely. There is an effect that the seal replacement work can be performed, large-scale equipment is not required, and the solidification time of the water blocking material is only longer than the normal excavation time, and the replacement can be performed easily and inexpensively in a short time. The structure of claim 2 has an effect that exchange can be performed in a shorter time, and these methods have an effect that can be properly performed by using the device having the structure of claims 3 to 4.

[Brief description of drawings]

FIG. 1 is an overall side view of an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part for explaining the process of the invention of claim 1.

FIG. 3 is an enlarged cross-sectional view of a main part for explaining a process following FIG.

FIG. 4 is an enlarged cross-sectional view of the main parts for explaining the process following FIG.

FIG. 5 is an enlarged cross-sectional view of the main part for explaining the process following FIG.

FIG. 6 is an enlarged cross-sectional view of a main part for explaining a process following FIG.

FIG. 7 is an enlarged cross-sectional view of the main parts for explaining the process following FIG.

FIG. 8 is an enlarged cross-sectional view of the main parts for explaining the process following FIG.

FIG. 9 is an enlarged cross-sectional view of the main part for explaining the process following FIG.

FIG. 10 is an enlarged cross-sectional view of the main parts for explaining the process following FIG.

FIG. 11 is a perspective view of a tail seal member.

FIG. 12 is a perspective view of an embodiment of an inspection segment member of the present invention.

13 is a sectional view of FIG.

FIG. 14 is a perspective view of an embodiment of a segment member with a seal of the present invention.

FIG. 15 is a perspective view of the movable seal member of FIG. 14 in a mounted state.

16 is a sectional view of the usage state of FIG.

FIG. 17 is a perspective view of an embodiment of a working segment member of the device of the present invention.

FIG. 18 is a perspective view of another embodiment of the working segment member of the device of the present invention.

FIG. 19 is a sectional view of an embodiment of the inspection segment with a seal of the device of the present invention.

FIG. 20 is a cross-sectional view of another embodiment of the inspection segment with a seal of the device of the present invention.

FIG. 21 is a sectional view of another embodiment of the inspection segment with a seal of the device of the present invention.

FIG. 22 is a perspective view of a modified example of the segment member with a seal of the device of the present invention.

FIG. 23 is an explanatory view of a process using the segment member with a seal shown in FIG. 22.

[Explanation of symbols]

1 Shield machine 2 Tail plate 3
Segment 5 Tail seal 8 Inspection hole 9
Inspection segment 10 Sealed segment 11 Injection port 1
2 movable seal member 14 work segment 15 work opening 1
7 Water stop material 18 Extrusion plate 19 Temporary propulsion segment 20 New tail seal 21 Sealed inspection segment

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21D 11/00

Claims (6)

(57) [Claims] 1. A method of exchanging a tail seal detachably provided on an inner peripheral surface of a tail plate, which seals between a tail plate at the rear of a shield machine and an existing segment, in which the existing segment is connected to the existing segment. An inspection segment having an inspection hole for the tail seal is provided to advance the shield machine, and a water-stopping material injection port that communicates with the inside and outside of the inspection segment and the outside is injected by the water-stopping material. A shielded segment having a movable seal member that opens to advance the shield machine, and a work segment having a work opening for separating the tail seal from the tail plate following the shielded segment The shield machine is moved forward to inject the waterproofing material between the tail plate and the inlet of the segment with the seal, and then the tail plate The work for separating the tail seal is performed from the work port, and after disassembling a temporary propulsion segment is attached to the work segment via an extrusion plate that pushes the tail seal backward, the shield machine is advanced, A method for exchanging a tail seal of a shield machine, comprising disassembling a temporary propulsion segment, and pushing the tail seal backward to attach and fix a new tail seal to the inner surface of the removed tail plate. 2. A method of replacing a tail seal detachably provided on an inner peripheral surface of a tail plate for sealing between a tail plate at the rear of a shield machine and an existing segment, the method comprising: The inspection machine of the tail seal is provided with an inspection port with a waterproof material communicating with the inside and outside of the tail seal and an inspection segment with a seal provided with a movable sealing member that opens outward by the injection of the waterproof material. Let
Providing a working segment having a working port for separating the tail seal from the tail plate subsequent to the inspection segment with seal, and advancing the shield machine.
After injecting a waterproof material between the tail plate and the injection port of the inspection segment with a seal, the work of separating the tail seal from the tail plate is performed from the work port, and the tail seal is attached to the work segment. After attaching the disassembling temporary propulsion segment through the extruding plate pushed out rearward, the shield machine is advanced, the provisional propulsion segment is disassembled, and the tail seal is extruded rearward to the inner surface of the removed tail plate. A method for replacing the tail seal of a shield machine, characterized by mounting and fixing a new tail seal. 3. A device for replacing a tail seal, which is detachably provided on the inner peripheral surface of the tail plate for sealing between the tail plate at the rear of the shield machine and the existing segment, and is provided with a transparent window. And an inspection segment having an inspection hole for the tail seal, an inlet for a water-stopping material that is provided in communication with the inspection segment and communicates with the inside and the outside, and a movable seal member that opens outwardly by injecting the water-stopping material. A segment with a seal, a working segment provided following the sealed segment and having a working port for separating the tail seal from the tail plate, and the tail seal mounted in front of the working segment A push-out plate for pushing out the rear part and a disassembling temporary propulsion segment provided subsequent to the push-out plate. Tail seal exchanging device for shield machine. 4. A device for replacing a tail seal detachably provided on an inner peripheral surface of the tail plate for sealing between a tail plate at the rear of the shield machine and an existing segment, which is provided with a transparent window. In addition to the inspection hole of the tail seal, an injection port of a water blocking material communicating with the inside and the outside, and a seal inspection segment provided with a movable seal member that is opened outward by the injection of the water blocking material, and following the seal segment. A working segment provided with a working opening for separating the tail seal from the tail plate; an extrusion plate mounted in front of the working segment to push the tail seal backward; A tail seal exchanging device for a shield machine, characterized in that it is configured with a disassembling provisional propulsion segment. 5. A replacement segment of a tail seal detachably provided on an inner peripheral surface of the tail plate for sealing between a tail plate at the rear of the shield machine and an existing segment, wherein a transparent window is provided. A segment for replacing a tail seal of a shield machine, characterized in that an inspection hole for the tail seal is provided. 6. A replacement segment of a tail seal detachably provided on the inner peripheral surface of the tail plate for sealing between the tail plate at the rear of the shield machine and the existing segment, the segment being inside and outside the segment. A plurality of communicating water inlets are formed, and each of the inlets is closed on the outer peripheral surface of the segment, and a plurality of water inlets are continuously arranged in the circumferential direction of the outer peripheral surface. A tail seal replacement segment for a shield machine, comprising a movable seal made of a metal plate, the front side of which is opened by the injection pressure of water material.