Cleaning segment ring, and cleaning method for gap between tail seals in tail clearance

Abstract

To provide a cleaning segment ring for efficiently cleaning infiltrating materials that have entered a gap between two rows of tail seals provided at a rear of a shield tunneling machine, and a cleaning method for a gap between tail seals in the tail clearance.SOLUTION: At least three tail seal rows 20, each consisting of a plurality of tail seals 21 arranged circumferentially, are arranged in the axial direction behind a main body 10 of a shield machine 30, with gaps 25 between the tail seal rows. A cleaning segment ring 50A cleans and discharges any infiltrating material F that has entered the gaps 25 between the tail seal rows, and is arranged with a tail clearance 23 between itself and the main body 10. At least two cleaning water supply and discharge hole rows 56A, each consisting of a plurality of cleaning water supply and discharge holes 56 arranged circumferentially, are arranged in the axial direction, with gaps 57 between the cleaning water supply and discharge hole rows. Each of the two cleaning water supply and discharge hole rows 56A is disposed in a corresponding tail seal row gap 25.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cleaning segment ring and a cleaning method for the area between tail seals in the tail clearance. [Background technology]

[0002] When a shield tunneling machine excavates, it fills the tail void between the wall of the excavation hole (for example, the wall of the over-excavation section) and the main body of the shield tunneling machine with backfill material, and seals the tail clearance between the segment ring assembled inside the main body and the rear of the main body with a tail seal installed on the inside rear of the main body while tunneling, thereby preventing groundwater, excavated soil, backfill material, etc. from entering the inside of the main body. When the longitudinal alignment of a shield tunnel has curved sections in addition to straight sections, the tail clearance mentioned above tends to be narrower when the shield tunneling machine excavates the curved sections compared to the straight sections. Therefore, in order to ensure tail clearance in the curved sections, a solution is provided by applying segments (e.g., steel segments) that are narrow in the axial direction of the tunnel. Furthermore, when the curved section is a sharp curved section with a large curvature, this is handled by applying segments with a smaller outer diameter (so-called reduced diameter segments) compared to the segments applied to the straight section.

[0003] However, by applying the above-mentioned reduced diameter segments, the tail clearance in curved sections may become larger than the tail clearance in straight sections, increasing the possibility that infiltration materials mixed with excavated soil, backfill material, and groundwater may infiltrate into the tail clearance. If infiltrating material were to enter the tail clearance, various issues could arise, such as an increase in the thrust required by the shield jack (propulsion jack) due to the solidification of the infiltrating material, damage to the segment rings pressed by the shield jack due to the increased thrust, deformation of the main body (skin plate) of the shield tunneling machine facing the tail clearance due to the infiltrating material, damage to the segment rings assembled inside the main body when they pass through the tail clearance, and lack of roundness of the segment rings. For these reasons, it is desirable to clean the inside of the tail clearance while the shield machine is excavating, and especially after excavating curved sections (even sharply curved sections). Therefore, measures are sometimes taken to insert a cleaning segment ring into the segment ring, and to provide the cleaning segments that make up the cleaning segment ring with cleaning water supply and discharge holes that can supply cleaning water to the tail clearance and discharge the cleaning water and any infiltrated materials into the main body after cleaning.

[0004] Here, Patent Document 1 proposes a shield tunneling method. This shield tunneling method involves injecting tail sealer into the gaps between multiple tail seal members attached at axial intervals to the rear end of a skin plate at a predetermined segment ring portion that has multiple cleaning water supply and discharge holes spaced circumferentially, and with the gaps into which the tail sealer has been injected being positioned in the predetermined segment ring, cleaning water is supplied to the gaps into which the tail sealer has been injected via the cleaning water supply and discharge holes and then discharged to clean the gaps, after which tail sealer is re-injected into the gaps that have passed through the predetermined segment ring, and excavation work continues. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-161664 Summary of the Invention [Problem to be solved by the invention]

[0006] According to the shield tunneling method described in Patent Document 1, even if the tail sealer injected into the gaps between multiple tail seal members deteriorates or changes in quality, construction can be carried out without hindering smooth tunneling.

[0007] Generally, multiple tail seals are attached at intervals in the circumferential and axial directions behind the main body of the shield machine, and multiple circumferential tail seal rows are arranged in the axial direction with gaps between the tail seal rows. Having multiple tail seal rows in this way improves sealing performance and increases the likelihood that infiltrating material that has entered the tail clearance will be prevented from penetrating into the main body of the shield machine. For example, if three tail seal rows are installed, there will be a total of two gaps between the tail seal rows, and infiltrating material will enter through these two gaps between the tail seal rows.

[0008] The above-mentioned cleaning segment ring has multiple cleaning water supply and discharge holes spaced apart around its circumference, forming a row of cleaning water supply and discharge holes consisting of multiple cleaning water supply and discharge holes, but conventional cleaning segment rings, including the cleaning segment ring described in Patent Document 1, have a single row of cleaning water supply and discharge holes. Therefore, for example, when there are two rows of gaps between tail seal rows as described above, during the excavation process of the shield machine, the row of cleaning water supply and discharge holes in the cleaning segment ring is aligned with the gap between the first row of tail seal rows, the shield machine is stopped, cleaning water is supplied to the tail clearance via the cleaning water supply and discharge holes to clean any intrusions in the gap between the first row of tail seal rows, the shield machine is then advanced slightly, the row of cleaning water supply and discharge holes in the cleaning segment ring is aligned with the gap between the second row of tail seal rows, the shield machine is stopped, and cleaning water is supplied to the tail clearance via the cleaning water supply and discharge holes to clean any intrusions in the gap between the second row of tail seal rows.In this way, the shield machine needs to be advanced slightly and stopped, and multiple cleaning operations are required, posing challenges to cleaning efficiency.

[0009] The present invention aims to provide a cleaning segment ring and a cleaning method for the gaps between the tail seals in the tail clearance that are highly efficient in cleaning and discharging materials that have infiltrated into the gaps between the two tail seal rows, in which three rows of tail seals are provided behind the main body of a shield tunneling machine and two rows of gaps between the tail seal rows are provided between them. [Means for solving the problem]

[0010] In order to achieve the above object, one aspect of the cleaning segment ring according to the present invention is A cleaning segment ring is provided in which a plurality of tail seals are attached at intervals in the circumferential and axial directions behind the main body of a shield machine, and at least three axial rows of tail seals each consisting of a plurality of circumferential tail seals are provided with gaps between the tail seal rows, and which cleans and discharges infiltrating material that has entered each gap between the tail seal rows, the washing machine is arranged with a tail clearance between it and the main body, and has a plurality of flush water supply and discharge holes spaced apart in the circumferential and axial directions, and at least two flush water supply and discharge hole rows, each consisting of a plurality of flush water supply and discharge holes in the circumferential direction, are arranged in the axial direction with a gap between the flush water supply and discharge hole rows; The two rows of cleaning water supply and discharge holes are each disposed in a gap between the corresponding rows of tail seals.

[0011] According to this aspect, at least two rows of cleaning water supply and discharge holes, each consisting of a plurality of cleaning water supply and discharge holes in the circumferential direction, are arranged in the axial direction with gaps between the rows of cleaning water supply and discharge holes, and the two rows of cleaning water supply and discharge holes are arranged in the corresponding gaps between the rows of tail seals, thereby eliminating the need to perform cleaning operations twice, before and after the shield tunneling machine starts to excavate slightly and then stops excavating, and allowing the gaps between the two rows of tail seal rows to be cleaned in a single cleaning operation.

[0012] Here, "having at least two rows of cleaning water supply and discharge holes" means that it includes a configuration in which two rows of cleaning water supply and discharge holes are provided, as well as a configuration in which three or more rows are provided. For example, in a case in which gaps between three rows of tail seal rows are to be cleaned in one go, a configuration having three rows of cleaning water supply and discharge holes is applied.

[0013] For example, the gaps between the cleaned tail seal rows are filled with tail sealer from inside the main body, forming a seal structure together with the tail seals that extend from the inside of the rear of the main body and slide against the assembled segment rings.

[0014] Furthermore, as described above, the cleaning segment ring of this embodiment is preferably applied during construction of curved sections of a shield tunnel, or particularly sharply curved sections with large curvatures (for example, at the stage when the curved section has been completed), but it may also be applied to straight sections of a shield tunnel.

[0015] In another embodiment of the segment ring for cleaning according to the present invention, The cleaning segments constituting the cleaning segment ring are steel segments in which a plurality of main girders and joint plates are attached to a skin plate, The cleaning water supply and discharge holes are provided in the skin plate, At least one of the cleaning segments constituting the cleaning segment ring is provided with a hatch having an opening relatively larger than that of the cleaning water supply and discharge hole in the skin plate at a position not interfering with the cleaning water supply and discharge hole, The hatch is characterized in that it is either an opening with an opening / closing door or an opening that is closed by welding or bolting a steel plate after cleaning is completed.

[0016] According to this aspect, a hatch with a relatively larger opening than the cleaning water supply and discharge hole is provided in a position in the skin plate of the steel segment that does not interfere with the cleaning water supply and discharge hole, so that relatively large lumps of infiltrating material that are difficult to discharge through the cleaning water supply and discharge hole can be discharged into the main body of the shield tunneling machine through the hatch.

[0017] Here, "at least one cleaning segment constituting the cleaning segment ring has a hatch" includes a configuration in which one cleaning segment has a hatch, a configuration in which all cleaning segments have hatches, and a configuration in which multiple cleaning segments, but not all, have hatches.

[0018] Another aspect of the segment ring for cleaning according to the present invention is The cleaning segment ring is characterized in that the cleaning segment at the bottom end is provided with the hatch.

[0019] According to this aspect, for example, in a configuration in which one cleaning segment is provided with a hatch, the hatch is provided on the cleaning segment at the lowest end of the cleaning segment ring, and in a configuration in which multiple cleaning segments are provided with hatches, one of them is the cleaning segment at the lowest end, which is preferable because relatively large clumps of infiltrating material can be washed down to the lowest end and then efficiently discharged into the main body of the shield tunneling machine through the hatch of the cleaning segment at the lowest end.

[0020] Furthermore, one aspect of the cleaning method for a gap between tail seals in a tail clearance according to the present invention is to A method for cleaning gaps between tail seals in a tail clearance, in which a plurality of tail seals are attached at intervals in the circumferential and axial directions behind the main body of a shield machine, at least three axial rows of tail seals each consisting of a plurality of tail seals in the circumferential direction, with gaps between the tail seal rows, are provided, and material that has entered each gap between the tail seal rows is cleaned and discharged, a flushing segment ring disposed with a tail clearance between itself and the main body, with a plurality of flushing water supply and discharge holes provided at intervals in the circumferential and axial directions, and at least two flushing water supply and discharge hole rows consisting of the plurality of flushing water supply and discharge holes in the circumferential direction arranged in the axial direction with gaps between the flushing water supply and discharge hole rows; The two rows of cleaning water supply and discharge holes are each arranged in the gap between the corresponding rows of tail seals, and cleaning is performed in sequence from the cleaning water supply and discharge hole at the top end to the cleaning water supply and discharge hole at the bottom on the left and right.

[0021] According to this aspect, at least two rows of cleaning water supply and discharge holes, each consisting of a plurality of cleaning water supply and discharge holes in the circumferential direction, are arranged in the axial direction with gaps between the rows of cleaning water supply and discharge holes, and the two rows of cleaning water supply and discharge holes are arranged in the gaps between the corresponding tail seal rows, and in each row of cleaning water supply and discharge holes, cleaning is performed in sequence from the cleaning water supply and discharge hole at the top to the cleaning water supply and discharge holes on the left and right below, thereby eliminating the need to perform cleaning operations twice, before and after the shield machine starts to excavate a little and then stops excavating, and allowing the gaps between two rows of tail seal rows to be cleaned in a single cleaning operation.

[0022] In another aspect of the method for cleaning between tail seals in a tail clearance according to the present invention, The cleaning segments constituting the cleaning segment ring are steel segments in which a plurality of main girders and joint plates are attached to a skin plate, The cleaning water supply and discharge holes are provided in the skin plate, At least one of the cleaning segments, including the cleaning segment at the lowest end, of the cleaning segment ring is provided with a hatch having an opening relatively larger than that of the cleaning water supply and discharge hole in the skin plate at a position that does not interfere with the cleaning water supply and discharge hole, Relatively large intruded objects are discharged through the hatch.

[0023] According to this embodiment, for example, in a configuration in which one cleaning segment is provided with a hatch, the hatch is provided on the cleaning segment at the lowest end of the cleaning segment ring, and in a configuration in which multiple cleaning segments are provided with hatches, one of them is the lowest cleaning segment, so that clumps of infiltrating material of relatively large dimensions (dimensions that cannot be discharged through the cleaning water supply and discharge hole) can be dropped to the lowest end by cleaning, and then efficiently discharged into the main body of the shield tunneling machine through the hatch of the cleaning segment at the lowest end, which is preferable. [Effects of the Invention]

[0024] According to the cleaning segment ring and cleaning method between tail seals in the tail clearance of the present invention, three rows of tail seals are provided behind the main body of the shield tunneling machine, and two rows of gaps between the tail seal rows are provided between them, and when cleaning and discharging materials that have infiltrated into the gaps between the two rows of tail seal rows, cleaning with excellent cleaning efficiency can be achieved. [Brief explanation of the drawings]

[0025] [Figure 1] A vertical cross-sectional view showing an example of a cleaning segment ring according to an embodiment arranged behind the main body of a shield tunneling machine during excavation. [Figure 2] 2 is a view taken along the line II-II in FIG. 1, showing an example of a cleaning segment ring according to an embodiment, as seen from the axial direction of a shield machine. FIG. [Figure 3]FIG. 2 is a perspective view of an example of a cleaning segment that constitutes a cleaning segment ring according to an embodiment. [Figure 4] FIG. 10 is a perspective view of another example of a cleaning segment that constitutes the cleaning segment ring according to the embodiment. [Figure 5] 10A to 10C are process diagrams illustrating an example of a method for cleaning between tail seals in a tail clearance according to an embodiment. [Figure 6] 5A to 5C are process diagrams illustrating an example of a method for cleaning between tail seals in a tail clearance according to an embodiment. [Figure 7] 6A to 6C are process diagrams illustrating an example of a method for cleaning between tail seals in a tail clearance according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, a cleaning segment ring and a method for cleaning the gap between tail seals in the tail clearance according to an embodiment will be described with reference to the accompanying drawings. Note that in this specification and the drawings, substantially identical components will be designated by the same reference numerals, and redundant description may be omitted.

[0027] [Cleaning segment ring according to the embodiment and cleaning method between tail seals in the tail clearance] An example of a cleaning segment ring according to an embodiment and a cleaning method for cleaning the gap between the tail seals in the tail clearance will be described with reference to FIGS. 1 to 7. FIG. Here, Fig. 1 is a longitudinal cross-sectional view showing an example of a cleaning segment ring according to an embodiment disposed behind the main body of a shield machine during excavation, and Fig. 2 is a view taken along arrows II-II in Fig. 1, showing an example of a cleaning segment ring according to an embodiment as seen from the axial direction of the shield machine. Also, Fig. 3 and Fig. 4 are both perspective views of an example of a cleaning segment that constitutes a cleaning segment ring according to an embodiment.

[0028] The illustrated shield machine 30 is an earth pressure shield machine (including a mud pressure shield machine) that includes a cutter head 13 that excavates ground G while rotating in the X1 direction at the front 11 of the excavation direction of the main body 10, and multiple tail seals 21 attached at intervals in both the circumferential and axial directions of the main body 10 inside the rear 12 of the excavation direction, with three axial rows of tail seals 20 consisting of multiple circumferential tail seals 21. The shield machine may also be a mud pressure shield machine equipped with multiple cutter spokes extending radially. The shield machine may also be a center-bent shield machine equipped with a front body and a rear body.

[0029] The main body 10 has a partition wall 15 (bulkhead) behind the cutter head 13, and a chamber 16 for taking in the excavated earth and sand (excavated soil) between the partition wall 15 and the cutter head 13, with multiple fixed blades 15a provided on the side of the partition wall 15 facing the chamber 16, and agitating blades 13a provided on the back of the cutter head 13 facing the chamber 16. A mud-adding agent is supplied to the excavated soil taken into the chamber 16, and by rotating the agitating blades 13a in accordance with the rotation of the cutter head 13, the excavated soil is plastically fluidized by the fixed blades 15a and the rotating agitating blades 13a, and discharged soil is generated.

[0030] A plurality of hydraulic motors 13b for driving cutter heads are provided near the center of the back surface of the partition wall 15, and a screw conveyor 17 connected to the chamber 16 extends in an inclined position from below the back surface of the partition wall 15 to the rear of the main body 10, and the excavated soil generated by plastic fluidization inside the chamber 16 is transported by the screw conveyor 17 to the rear of the shield tunneling machine 30.

[0031] A plurality of shield jacks 19 are attached to the inner surface of the main body 10 (only two shield jacks are shown in Figure 1), and an erector device 18 at the rear of the main body 10 assembles a plurality of segments 40 into a ring shape to form a segment ring 40A, and further assembles a plurality of cleaning segments 50 into a ring shape to form a cleaning segment ring 50A.The extended shield jacks 19 press against the segment ring 40A and the cleaning segment ring 50A, causing the shield tunneling machine 30 to excavate in the X2 direction, which is the excavation direction.

[0032] In addition, on the inside of the rear 12 of the main body 10 in the excavation direction (the rear inside of the skin plate that constitutes the main body 10), as described above, three rows of tail seals 20 consisting of a plurality of tail seals 21 attached at intervals around the circumferential direction of the main body 10 are arranged in the axial direction with two gaps 25 between the tail seal rows.

[0033] More specifically, a tail clearance 23 is formed between the rear inside of the main body 10 of the shield tunneling machine 30 and the segment ring 40A and cleaning segment ring 50A assembled inside it, and the tips of each tail seal 21 that make up each tail seal row 20 slide against the outer surface of the cleaning segment 50, forming a tail seal row gap 25 in an annular space surrounded by the left and right tail seal rows 20, the rear inner surface of the main body 10, and the outer surface of the cleaning segment ring 50A.

[0034] When the shield tunneling machine 30 is excavating, particularly in curved sections, the copy cutter 14 is extended in the X3 direction from the side of the cutter head 13 toward the ground G, and the copy cutter 14 rotates along with the cutter head 13, creating an over-excavation section G1 equivalent to the extension length of the copy cutter 14, and backfill material J (slip material) is filled from inside the main body 10, thereby enabling the shield tunneling machine 30 to excavate smoothly in curved sections.

[0035] As shown in FIG. 2, the multiple cleaning segments 50 that make up the cleaning segment ring 50A assembled by the erector device 18 include multiple (three in the illustrated example) A-type cleaning segments 50c, multiple (two in the illustrated example) B-type cleaning segments 50b, and a K-type cleaning segment 50a that is finally fitted between the two B-type cleaning segments 50b.

[0036] Each cleaning segment 50 has a plurality of cleaning water supply and discharge holes 56 spaced apart around its circumference, and the cleaning water supply and discharge holes 56 of each cleaning segment 50a, 50b, 50c form one row of cleaning water supply and discharge hole rows 56A, and in the illustrated example, as shown in Figures 1 and 3, two rows of cleaning water supply and discharge hole rows 56A are formed with a gap 57 between the rows of cleaning water supply and discharge hole rows.

[0037] As shown in FIG. 1, the two rows of flush water supply and discharge holes 56A are disposed in the corresponding gaps 25 between the rows of tail seals.

[0038] As shown in FIG. 3, the cleaning segments 50 forming the cleaning segment ring 50A are steel segments.

[0039] This steel segment 50 has a pair of main girders 51, a pair of joint plates 52 (segment joint plates) welded to the ends of the pair of main girders 51 at their circumferential ends, a skin plate 53 welded to the outer frame-like end formed by the pair of main girders 51 and the pair of joint plates 52, and a plurality of vertical ribs 54 welded to the inner surfaces of the pair of main girders 51 and the skin plate 53. In the illustrated example, the main girder 51 also serves as the ring joint plate.

[0040] Cleaning holes 53a (see Figure 5) are formed in the skin plate 53, and short pipes with female threads are welded to the positions corresponding to the cleaning holes 53a to form cleaning water supply and discharge holes 56. Ball valves 60 (check valves, see Figure 5, etc.) that can be opened and closed manually are attached to the cleaning water supply and discharge holes 56. Note that general segments 40 are also made of steel segments, and the same configuration as the segment shown in Figure 3 is applied to them, except that they do not have cleaning water supply and discharge holes 56.

[0041] On the other hand, in Figure 4, a hatch 58 that is rectangular in plan view and has a relatively larger opening than the cleaning water supply and discharge hole 56 is provided in a position that does not interfere with the cleaning water supply and discharge hole 56 in the skin plate 53 that forms the steel segment 50 shown in Figure 3.

[0042] An opening / closing lid 59b is provided on the side of one end of the hatch 58 inside the skin plate 53 so as to be rotatable in the X7 direction via a rotation shaft 59a. A standard seal frame 59c is provided on the opening / closing lid 59b at a position that follows the outline of the hatch 58 when the hatch 58 is closed.

[0043] Here, the illustrated example shows a configuration in which the hatch 58 is sealed and closed by an opening / closing lid 59b that can be opened and closed freely, but it may also be a configuration in which after large intrusion objects F are discharged from the hatch 58, the hatch 58 is closed with a lid made of steel plate and the lid is welded or bolted to the skin plate 53.

[0044] By applying the cleaning segment 50' shown in Figure 4 to, for example, the lowest cleaning segment ring (for example, the A-type cleaning segment 50c in the center in Figure 2) among the multiple cleaning segments that make up the cleaning segment ring 50A, clumps of intrusion F that have fallen downward during the cleaning process and are too large to be discharged from the cleaning water supply and discharge hole 56 can be discharged into the inside of the main body 10.

[0045] In this way, the two rows of cleaning water supply and discharge holes 56A provided in the cleaning segment ring 50A are aligned with the two rows of tail seal row gaps 25 between the three rows of tail seal rows 20 provided in the tail clearance 23 behind the main body 10 of the shield tunneling machine 30, so that some of the cleaning water supply and discharge holes 56 that make up the cleaning water supply and discharge hole row 56A can be used to supply cleaning water to the two rows of tail seal row gaps 25 at once, thereby cleaning out any infiltrating matter F (see Figure 5) that has infiltrated into each of the tail seal row gaps 25.

[0046] The washed infiltrated matter F is discharged into the main body 10 through the remaining cleaning water supply and discharge holes 56 (cleaning water supply and discharge holes 56 to which cleaning water is not being supplied) that make up the cleaning water supply and discharge hole row 56A.

[0047] For example, if the cleaning segment ring has one row of cleaning water supply and discharge holes, it would be necessary to align one row of cleaning water supply and discharge holes with one of the gaps between the two tail seal rows and clean its interior, then advance the shield machine slightly and stop it, align the row of cleaning water supply and discharge holes with the other gap between the tail seal rows, and clean its interior, which would be a time-consuming cleaning operation.In contrast, by applying the cleaning segment ring 50A shown in the illustrations, it is possible to clean the gaps 25 between the two tail seal rows in a single cleaning operation, eliminating the need to perform the cleaning operation twice, before and after advancing the shield machine slightly and stopping it.

[0048] Next, an example of a method for cleaning the gap between the tail seals in the tail clearance according to this embodiment will be described with reference to FIGS.

[0049] First, as shown in Figure 5, for example, when the shield machine 30 finishes construction of the curved section, the infiltrating material F that has infiltrated into the gap 25 between the two tail seal rows is cleaned. This infiltrating material F is formed by the intrusion of excavated soil and sand, backfill material J, groundwater, etc.

[0050] When cleaning each of the gaps 25 between the tail seal rows, the two rows of cleaning water supply and discharge holes 56A provided in the cleaning segment ring 50A are aligned with the two rows of gaps 25 between the tail seal rows.

[0051] As shown in FIG. 5, a ball valve 60 is attached to each cleaning water supply / discharge hole 56 that is attached so as to communicate with the cleaning hole 53a of the skin plate 53 of each cleaning segment 50 that constitutes the cleaning segment ring 50A.

[0052] 6, in the cleaning water supply and discharge hole row 56A, cleaning water is supplied in the Y1 direction from, for example, one of the cleaning water supply and discharge holes 56 adjacent in the circumferential direction to the gap 25 between the tail seal rows. This supply of cleaning water is performed by high-pressure washing.

[0053] At this time, the ball valve 60 of the other adjacent cleaning water supply and discharge hole 56 discharges the cleaned intrusion F and the cleaning water after cleaning into the inside of the main body 10 in the Y2 direction, thereby discharging the intrusion F from the gap 25 between the tail seal rows and cleaning the gap 25 between the tail seal rows.

[0054] As shown in Figure 2, cleaning is performed in the X5 direction from the cleaning water supply and discharge hole 56 at the top of the row of cleaning water supply and discharge holes 56A to the cleaning water supply and discharge holes 56 on the left and right below, thereby allowing any infiltrating matter F of a size that cannot be discharged into the main body 10 from the cleaning water supply and discharge holes 56 during cleaning to fall downward one by one.

[0055] As described above, the cleaning segment 50c at the lowest end is provided with a hatch 58 shown in Fig. 4, and large-sized infiltrating matter F that has fallen downward is discharged into the inside of the main body 10 through the hatch 58. Here, the illustrated example is a form in which one hatch 58 is provided in the area between the two cleaning water supply and discharge holes 56 between a pair of vertical ribs 54, but it may also be a form in which one hatch (for example, a hatch of larger size than in the illustrated example because there is no cleaning water supply and discharge hole 56) is provided between a pair of vertical ribs 54 where no cleaning water supply and discharge hole 56 exists, or a form in which multiple (for example, two) hatches 58 are provided, etc.

[0056] As shown in Figure 7, after the gap 25 between the tail seal rows is cleaned, tail sealer S is filled in the Y3 direction into the gap 25 between the tail seal rows through the cleaning water supply and discharge hole 56, thereby forming a sealing structure consisting of multiple tail seal rows 20 and tail sealer S.

[0057] It should be noted that the present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0058] 10: Main body 11:Front (excavation direction forward) 12: Rear (excavation direction rear) 13: Cutter head 14: Copy cutter 15: Bulkhead 16: Chamber 17:Screw conveyor 18: Erector device 19: Shield Jack 20: Tail seal row 21: Tail seal 23: Tail clearance 25: Gap between tail seal rows 30: Shield tunneling machine 40: Segment ring 41: Segment (steel segment) 50A: Cleaning segment ring 50,50': Cleaning segment (steel segment) 50a: K-type cleaning segment 50b: Type B cleaning segment 50c: A-type cleaning segment 51: Main girder 52: Joint plate 53: Skin Plate 53a: 54: Vertical rib 56: Cleaning water supply and discharge hole 56A: Cleaning water supply and discharge hole row 57: Gap between rows of cleaning water supply and discharge holes 58: Hatch 59a: Rotating shaft 59b: Opening / closing lid 59c: Sticker frame 60: Ball valve (check valve) G: Ground G1: Overcutting section J: Backfill material F: Infiltrate S: Tail sealer

Claims

1. A cleaning segment ring is provided in which a plurality of tail seals are attached at intervals in the circumferential and axial directions behind the main body of a shield machine, and at least three axial rows of tail seals each consisting of a plurality of circumferential tail seals are provided with gaps between the tail seal rows, and which cleans and discharges infiltrating material that has entered each gap between the tail seal rows, the cleaning water supply and discharge hole arrays are arranged in at least two axial rows with a gap between them, the cleaning water supply and discharge hole arrays being made up of the cleaning water supply and discharge hole arrays in the circumferential direction, the cleaning water supply and discharge hole arrays being made up of the cleaning water supply and discharge hole arrays in the circumferential direction, the cleaning water supply and discharge hole arrays being made up of the cleaning water supply and discharge hole arrays in the axial ... A segment ring for cleaning, characterized in that the two rows of cleaning water supply and discharge holes are respectively disposed in the gaps between the corresponding rows of tail seals.

2. The cleaning segments constituting the cleaning segment ring are steel segments in which a plurality of main girders and joint plates are attached to a skin plate, The cleaning water supply and discharge holes are provided in the skin plate, At least one of the cleaning segments constituting the cleaning segment ring is provided with a hatch having an opening relatively larger than that of the cleaning water supply and discharge hole in the skin plate at a position not interfering with the cleaning water supply and discharge hole, 2. The segment ring for cleaning according to claim 1, wherein the hatch is either an opening provided with an opening / closing door or an opening that is closed by welding or bolting a steel plate after cleaning is completed.

3. 3. The cleaning segment ring according to claim 2, wherein the cleaning segment at the lowermost end of the cleaning segment ring is provided with the hatch.

4. A method for cleaning gaps between tail seals in a tail clearance, in which a plurality of tail seals are attached at intervals in the circumferential and axial directions behind the main body of a shield machine, at least three axial rows of tail seals each consisting of a plurality of tail seals in the circumferential direction, with gaps between the tail seal rows, are provided, and matter that has infiltrated into each gap between the tail seal rows is cleaned and discharged, a flushing segment ring disposed with a tail clearance between itself and the main body, with a plurality of flushing water supply and discharge holes provided at intervals in the circumferential and axial directions, and with at least two flushing water supply and discharge hole rows formed of the plurality of flushing water supply and discharge holes in the circumferential direction and arranged in the axial direction with gaps between the flushing water supply and discharge hole rows; A method for cleaning between tail seals in a tail clearance, characterized in that two rows of cleaning water supply and discharge holes are each arranged in the gap between the corresponding rows of tail seals, and cleaning is performed in order from the cleaning water supply and discharge hole at the top end of the row of cleaning water supply and discharge holes to the cleaning water supply and discharge holes at the bottom on the left and right.

5. The cleaning segments constituting the cleaning segment ring are steel segments in which a plurality of main girders and joint plates are attached to a skin plate, The cleaning water supply and discharge holes are provided in the skin plate, At least one of the cleaning segments, including the cleaning segment at the bottom, is provided with a hatch having an opening relatively larger than that of the cleaning water supply and discharge hole in the skin plate at a position that does not interfere with the cleaning water supply and discharge hole, 5. The method for cleaning the gap between tail seals in a tail clearance according to claim 4, wherein relatively large intruded matter is discharged through the hatch.

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