Removal device and removal method of existing tunnel

Abstract

To provide a removal device and a removal method of an existing tunnel capable of realizing efficient removal work even for the existing tunnel with a small diameter.SOLUTION: A removal device 50 of an existing tunnel for removing a separated liner body 63 made by cutting the existing tunnel 60A while moving in the existing tunnel 60A comprises: a body 10 provided with one end 11 and the other end 12 in a longitudinal direction of the existing tunnel 60A; moving means 20 arranged on the one end 11 side and the other end 12 side of the body 10; a plurality of outriggers 40 arranged on the one end 11 side and the other end 12 side of the body 10 and telescopically equipped in a radial direction of the existing tunnel 60A in relation to the body 10; and an elector 30 rotatably attached on the one end 11 side of the body 10 and taking in the separated liner body 63 inside of the existing tunnel 60A by telescopic motion in the radial direction of the existing tunnel 60A.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an apparatus and method for removing an existing tunnel. [Background technology]

[0002] In cases of renewal work due to deterioration of existing underground tunnels, such as sewer mains or storm water mains, or in cases of construction to construct a new tunnel in place of an aging existing tunnel in a location that interferes with the existing tunnel, removal of the existing tunnel is carried out first. When removing such existing tunnels, in order to reduce the impact on ground, including traffic restrictions, a method may be used in which a vertical shaft is constructed leading to one or both ends of the existing tunnel, and workers and removal equipment are allowed to access the interior of the existing tunnel through the shaft.

[0003] Here, Patent Document 1 proposes an erector device used when removing some segments of an existing tunnel. This erector device includes a base provided on the floor plate installed in the existing tunnel, a main body provided on the base, a lateral sliding mechanism that slides the main body relative to the base so that the main body moves along the floor plate in a direction perpendicular to the axial direction of the existing tunnel, a multi-joint arm swingably connected to the main body, and a segment gripper provided at the tip of the multi-joint arm. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-82057 A Summary of the Invention [Problem to be solved by the invention]

[0005] The erector device described in Patent Document 1 moves a main body equipped with a multi-joint arm on a base installed on the floor plate of the existing tunnel. This requires the base to be constructed inside the existing tunnel, which not only takes time for the pre-removal work process, but also makes it difficult to construct a base inside the existing tunnel if the diameter of the existing tunnel is small, which may make the removal work of the existing tunnel itself difficult.

[0006] An object of the present invention is to provide an existing tunnel removal device and removal method that can achieve efficient removal work even if the existing tunnel has a small diameter. [Means for solving the problem]

[0007] In order to achieve the above object, one aspect of the present invention is a removal device for an existing tunnel, An existing tunnel removal device that moves within an existing tunnel to remove a lining section formed by cutting an existing tunnel, A main body having one end and the other end in the longitudinal direction of the existing tunnel; A moving means provided on one end side and the other end side of the main body; A plurality of outriggers are provided on one end side and the other end side of the main body and are equipped with the main body so as to be freely extended and retracted in the radial direction of the existing tunnel; The device is characterized by having an erector that is rotatably attached to one end side of the main body and expands and contracts in the radial direction of the existing tunnel to incorporate the lining section into the interior of the existing tunnel.

[0008] According to this aspect, a moving means is provided on one and the other ends of a main body which has one and the other ends in the longitudinal direction of an existing tunnel and is equipped with an erector which takes the lining segment into the interior of the existing tunnel.Therefore, by moving the main body from a vertical shaft to a desired position in the existing tunnel, taking in the lining segment with the erector, and moving the main body to the vertical shaft, the lining segment can be efficiently removed, even from an existing tunnel with a small diameter, for example. In addition, since the erector is attached to the main body so as to be freely rotatable and is freely expandable and contractable in the radial direction of the existing tunnel, for example, when the main body moves through the existing tunnel, the erector can be contracted, making it possible to move the removal device inside the existing tunnel even if the existing tunnel has a small diameter.The erector can be rotated to align it with a lining segment at any position circumferentially of the existing tunnel, and the erector can be used to capture and remove the lining segment. Furthermore, because the outriggers are provided on the main body so that they can be freely extended and retracted in the radial direction of the existing tunnel, the outriggers can maintain the stable position of the main body against the inner wall of the existing tunnel, which has a curve, while the erector can capture the lining sections. Like the erector, the outriggers are also in a retracted position when the main body moves.

[0009] Here, "lining division" refers to a division of an existing tunnel cut into several pieces prior to removal by the removal equipment. As an example, the existing tunnel is cut into several rings of a predetermined width in its longitudinal direction, and each ring is then cut into several pieces in the circumferential direction to become several lining divisions. Furthermore, the statement that the main body "has one end and the other end in the longitudinal direction of the existing tunnel" means that the main body has a certain length in the longitudinal direction and has one end and the other end at both ends; for example, a form in which the main body is long in the longitudinal direction of the existing tunnel is preferable because this increases the posture stability of the main body when the lining section is introduced into the erector or when it moves within the existing tunnel.

[0010] Additionally, examples of the "movement means" include wheels or electric wheels. For example, by providing a pair of wheels or electric wheels on both one end and the other end of the main body, stable movement of the main body with the lining segments incorporated within the existing tunnel can be achieved. Furthermore, for example, the drive of the electric wheels, the rotational drive and extension drive of the erector, and the extension drive of the outriggers may be operated by a controller held by a worker inside the shaft or existing tunnel, or the captured images sent from an imaging means separately equipped on the main body may be imported into a computer located at a management location on the ground, etc., and the operations may be performed by an operator located at the management location based on the captured images.

[0011] Another aspect of the present invention is a removal device for an existing tunnel. The erector is attached to one end side of the main body so as to be freely slidable in the longitudinal direction.

[0012] According to this embodiment, the erector is attached to one end of the main body so as to be slidable in the longitudinal direction of the existing tunnel, so that the erector can be precisely aligned to the lining section to be removed in the existing tunnel by sliding the erector, without precisely aligning the main body to the lining section to be removed. If the erector was not slidable, it would be necessary to precisely align the main body to the lining section to be removed and then extend the erector in the radial direction, and this delicate alignment of the main body would require time and effort.

[0013] Another aspect of the present invention is a removal device for an existing tunnel. The present invention is characterized in that an auxiliary moving means is provided at the other end side of the main body opposite the erector so as to be freely movable along the wall surface of the tunnel.

[0014] According to this aspect, the auxiliary moving means is provided on the other end of the main body opposite the erector so as to be movable along the wall of the tunnel, so that, for example, when the erector takes in the lining division, even if the main body tilts to one end where the erector is located due to the weight of the lining division, the auxiliary moving means, for example, at the upper part of the other end opposite the erector, can abut against the upper wall of the existing tunnel. In other words, the main body tilted by the weight of the lining division can maintain a stable position by the moving means at one end and the auxiliary moving means at the other end abutting the lower and upper parts of the wall of the existing tunnel, and in this stable position, it can be moved inside the existing tunnel, for example, to a vertical shaft.

[0015] Here, the auxiliary moving means can take various forms, such as a form in which the auxiliary moving means is composed of an axis member and a wheel attached to one end of the axis member, with the other end of the axis member attached to the main body, or a form in which the auxiliary moving means is composed of an axis member that is pre-equipped on the other end side of the main body and a wheel that is attached to the axis member, with the extendable axis member extending until the wheel abuts against the wall surface.

[0016] In addition, one aspect of the method for removing an existing tunnel according to the present invention is to A method for removing an existing tunnel, comprising the steps of: Process A: cutting the existing tunnel into a plurality of lining divisions, and maintaining the state of the existing tunnel with the plurality of lining divisions; A step B of housing a removal device for an existing tunnel in the existing tunnel through a vertical shaft, the removal device including at least a main body, a moving means provided on the main body, and an erector rotatably attached to the main body; A process C in which the removal device is run inside the existing tunnel to align it, the erector takes the lining division body into the existing tunnel, and the removal device is moved to the vertical shaft to carry out the lining division body; The method is characterized by having a step D of repeatedly carrying out the step C and backfilling the cavity formed by removing the existing tunnel with backfill soil.

[0017] According to this embodiment, the existing tunnel is cut into multiple lining sections, a removal device equipped with an erector is run inside the existing tunnel to align it with the lining section to be removed, the lining section is taken in by the erector, and the removal device is moved to the vertical shaft to transport the lining section out.By moving the main body from the vertical shaft to the desired position in the existing tunnel, the lining section is taken in by the erector and moved to the vertical shaft, the lining section can be efficiently removed even if the existing tunnel has a small diameter. In addition, by backfilling the cavity formed by removing the existing tunnel with backfill soil, the impact on the surrounding environment, such as subsidence of the ground surface caused by the cavity remaining underground, can be reduced.

[0018] Here, "maintaining the state of the existing tunnel with the multiple cut lining sections" means, for example, connecting adjacent lining sections after cutting with connecting materials to prevent the lining sections from falling into the interior of the existing tunnel, and maintaining the state of the existing tunnel until each lining section is removed by the removal equipment. The lining section that has been transported to the shaft by the movement of the removal device is lifted to the ground by a lifting device equipped on the shaft and transported outside the site. Here, if an existing shaft exists, the existing shaft is used, and if no existing shaft exists, a shaft is constructed at one or both ends of the existing tunnel to be removed.

[0019] In another aspect of the method for removing an existing tunnel according to the present invention, In step C, the lining section is fixed by the erector, the erector is retracted into the inside of the existing tunnel, the erector is rotated to move the lining section downward, and then the removal device is moved to the vertical shaft.

[0020] According to this embodiment, after the lining segment is fixed with the erector, the erector is retracted into the inside of the existing tunnel and rotated, the lining segment is moved downward, and then the removal device is moved to the vertical shaft, thereby realizing a stable moving posture of the removal device when taking in and moving the lining segment.

[0021] In another aspect of the method for removing an existing tunnel according to the present invention, In the process A, the existing tunnel is cut into a plurality of rings of a predetermined width in the longitudinal direction, adjacent rings are connected with connecting materials, each ring is cut into a plurality of lining segments in the circumferential direction, and adjacent lining segments in each ring are connected with connecting materials, thereby maintaining the state of the existing tunnel, and constructing two grooves by multiple core boring at both ends of the key lining segment that is located on the ceiling of each ring and is to be removed first.

[0022] According to this embodiment, the existing tunnel is cut into multiple rings of a predetermined width in the longitudinal direction, adjacent rings are connected with connecting materials, each ring is cut circumferentially to construct multiple lining divisions, adjacent lining divisions are connected with connecting materials to maintain the state of the existing tunnel, and two grooves are constructed by multiple core boring at both ends of the key lining division that is located on the ceiling of each ring and is to be removed first.When the removal device first takes in the key lining division in the ring to be removed, the two grooves at both ends of the key lining division prevent the key lining division from interfering with the adjacent lining division, and it can be quickly taken into the interior of the existing tunnel.

[0023] Another aspect of the method for removing an existing tunnel according to the present invention is to The method further includes a step E, which is carried out prior to the step A, of carrying out ground improvement work around the existing tunnel.

[0024] According to this aspect, by carrying out ground improvement work around the existing tunnel before cutting the existing tunnel into multiple lining sections, in cases where there is groundwater above the existing tunnel or where the ground is soft, it is possible to prevent groundwater from seeping into the existing tunnel when the existing tunnel is cut, and to carry out removal work of the existing tunnel with high construction safety. Effect of the Invention

[0025] According to the existing tunnel removal device and removal method of the present invention, efficient removal work can be achieved even if the existing tunnel has a small diameter. [Brief description of the drawings]

[0026] [Figure 1] This is a process diagram illustrating an example of a method for removing an existing tunnel according to an embodiment, and is a diagram illustrating process E. [Figure 2A] 1, is a process diagram illustrating an example of a method for removing an existing tunnel according to an embodiment, and is a diagram illustrating process A. FIG. [Figure 2B] FIG. 2B is a diagram for explaining step A following FIG. 2A. [Figure 2C] FIG. 2C is a diagram illustrating step A following FIG. 2B. [Diagram 3] FIG. 2 is a perspective view of an example of an existing tunnel removal device according to an embodiment. [Figure 4] FIG. 11 is a process diagram illustrating an example of a method for removing an existing tunnel according to an embodiment, and is a diagram illustrating process C. [Diagram 5] 3 is a view taken in the direction of an arrow III in FIG. 2, and is a front view of the removal device according to the embodiment. [Figure 6] This is a perspective view showing a worker entering the inside of an existing tunnel and operating the drives of each part of the removal device. [Figure 7] FIG. 5 is a diagram illustrating step C following FIG. [Figure 8] FIG. 8 is a diagram for explaining step C following FIG. [Figure 9] 8. FIG. 9 is a diagram for explaining step C following FIG. [Figure 10] 9, is a diagram for explaining step C. [Figure 11] FIG. 11 is a diagram illustrating step C following FIG. [Figure 12] FIG. 12 is a diagram for explaining step C following FIG. [Figure 13] FIG. 13 is a process diagram illustrating an example of a method for removing an existing tunnel according to an embodiment, and is a diagram illustrating process D. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, an existing tunnel removal device and a removal method according to an embodiment will be described with reference to the accompanying drawings. In this specification and the drawings, substantially identical components are designated by the same reference numerals to avoid redundant description.

[0028] [Existing tunnel removal device and removal method according to the embodiment] An example of an existing tunnel removal device and method according to an embodiment will be described with reference to Figs. 1 to 13. Here, FIG. 1 is a process diagram for explaining an example of a method for removing an existing tunnel according to the embodiment, which is a diagram for explaining the E process, and FIG. 2A to FIG. 2C are diagrams for explaining the A process, in order. FIG. 3 is a perspective view of an example of a removal device for an existing tunnel according to the embodiment. FIG. 4, FIG. 7 to FIG. 12 are process diagrams for explaining an example of a method for removing an existing tunnel according to the embodiment, which are diagrams for explaining the C process, FIG. 5 is a view in the III direction of FIG. 2, which is a front view of the removal device according to the embodiment, and FIG. 6 is a perspective view showing a state in which a worker enters the inside of the existing tunnel and operates the drive of each part of the removal device. Furthermore, FIG. 13 is a process diagram for explaining an example of a method for removing an existing tunnel according to the embodiment, which is a diagram for explaining the D process.

[0029] The existing tunnel 60 in the illustrated example will be described below as a small-diameter tunnel with an inner diameter of, for example, about 2 m, but the existing tunnel removal method and removal device of the embodiment can also be applied to the removal work of existing tunnels with a larger diameter.

[0030] In the ground G of the construction area shown in Fig. 1, there is an existing underground tunnel 60 such as a deteriorated sewer trunk line or a storm water trunk line. For example, a new tunnel (not shown) is planned in a direction perpendicular to the paper surface of Fig. 1 at a position where it interferes with an existing tunnel 60A of a part of the existing tunnel 60 with a section length L. Therefore, a case of removing the existing tunnel 60A of the part of the existing tunnel 60A will be taken up and a removal method and removal device for the existing tunnel will be described below. Since the part of the existing tunnel 60 such as the sewer trunk line will be removed, a detour for the sewer trunk line will be constructed prior to the removal construction, but details of this will be omitted.

[0031] In the method for removing an existing tunnel according to the embodiment, first, as shown in Fig. 1, a ground improvement body KG is constructed in an area surrounding a part of an existing tunnel 60A and a planned construction area of ​​a vertical shaft 70, and auxiliary measures are taken to prevent groundwater from infiltrating into the existing tunnel 60 during the removal and construction of the existing tunnel 60, and to safely construct the vertical shaft 70. Here, a suitable method for the ground improvement is selected from various methods such as a freezing method and a chemical injection method according to the conditions of the construction area (the above is step E).

[0032] Here, if the groundwater level is deeper than the existing tunnel 60, the strength of the ground G is sufficient, and ground improvement work is not required, the above-mentioned step E is not necessary.

[0033] Next, a pair of shafts 70 are constructed so as to communicate with both ends of the existing tunnel 60A in a section. Here, a single shaft 70 that communicates with one end of the existing tunnel 60A in a section may be constructed, but by constructing a pair of shafts 70 as in the illustrated example, the removal device 50 can enter the existing tunnel 60A from both shafts 70 and transport the lining segments to the outside of the site through the two shafts 70, improving the efficiency of the removal work.

[0034] Here, if the shaft 70 is an existing shaft, there is no need to construct a new shaft, and the existing shaft 70 can be utilized to remove and construct the existing tunnel 60A.

[0035] Inside the shaft 70, an underground platform 75 assembled with multiple steel materials is installed at the entrance of the existing tunnel 60A. The underground platform 75 has openings at the top and on the side of the existing tunnel 60A, and is capable of picking up the removal device 50 suspended from the ground through the upper opening, and of transporting the lining segments recovered by the removal device 50 to the ground through the upper opening.

[0036] Next, workers cut the existing tunnel 60A from inside the existing tunnel 60A into a plurality of lining divisions 63 (see FIG. 2B), and the removal device 50 housed inside the existing tunnel 60A accesses each lining division 63, transports them sequentially to the shaft 70, and removes them. In this way, the existing tunnel 60A is cut into a plurality of lining divisions 63, and until it is transported and removed by the removal device 50, the existing tunnel 60A maintains its state with the plurality of lining divisions 63. Here, the existing tunnel 60 can be a tunnel of various forms, such as a steel segment, or a laminate of a steel segment and a secondary lining concrete.

[0037] More specifically, as shown in Fig. 2A, workers enter an existing tunnel 60A and cut it into multiple rings 61 with a predetermined width t1 in the longitudinal direction using a wall saw or the like. Adjacent rings 61 are then connected to each other with multiple first connecting members (an example of a connecting member) 66 made of steel anti-slip plates and bolts. The predetermined width t1 can be set to a width of, for example, about 500 mm to 1000 mm.

[0038] Next, as shown in Fig. 2B, each ring 61 is cut in its circumferential direction to form a plurality of lining divisions 63. The lining divisions 63 adjacent to each other in the circumferential direction are also connected to each other by a plurality of second connecting members 67 (another example of a connecting member) made of a steel anti-slip plate and a bolt.

[0039] In this way, by connecting the rings 61 to each other with a plurality of first connecting materials 66 and connecting the lining segments 63 that form the rings 61 to each other with a plurality of second connecting materials 67, the state of the existing tunnel 60A can be maintained by the multiple lining segments 63.

[0040] Here, among the multiple lining segments 63 that form the ring 61 to be removed, the key lining segment 63A that the removal device 50 removes first (takes into the interior of the existing tunnel 60A) is located on the ceiling of the ring 61.

[0041] In order to smoothly incorporate this key lining segment 63A into the inside without interfering with the adjacent lining segment 63, as shown in Fig. 2C, multiple core borings 68a are constructed so as to partially overlap both ends of the key lining segment 63A, and two grooves 68 with multiple core borings 68a in succession are constructed. Note that even when a groove 68 consisting of multiple core borings 68a is constructed in this way, the key lining segment 63A is connected to the adjacent lining segment 63 by the first connecting material 66, so that the two can maintain their positions without coming off (the above is step A).

[0042] After a portion of the existing tunnel 60A is divided into a plurality of lining sections 63, the removal device 50 is housed inside the existing tunnel 60A from at least one of the pair of shafts 70.

[0043] 3, the removal device 50 has a main body 10 having one end 11 and the other end 12 in the longitudinal direction of the existing tunnel 60A, and moving means 20 provided on the one end 11 side and the other end 12 side of the main body 10. A plurality of outriggers 40 (three each in the illustrated example) are attached to each of the one end 11 side and the other end 12 side of the main body 10, and an erector 30 is further attached to the one end 11 side of the main body 10.

[0044] The erector 30 is attached to one end 11 of the main body 10 so as to be slidable in the longitudinal direction in the X2 direction and rotatable in the X1 direction. The erector 30 also expands and contracts in the radial direction of the existing tunnel 60A in the X3 direction to access the lining division 63 to be removed and to take the lining division 63 fixed to its tip into the interior of the existing tunnel 60A.

[0045] The outriggers 40 are also equipped on the main body 10 so as to be freely retractable in the X4 direction, which is the radial direction of the existing tunnel 60A.

[0046] The moving means 20 provided on one end 11 side and the other end 12 side of the main body 10 are a pair of front wheels 20A and a pair of rear wheels 20B, at least one of which is an electric wheel. In other words, the removal device 50 can move by itself using the multiple wheels 20 provided by itself, without the need to install rails or the like below the inside of the existing tunnel 60A. Here, not all the wheels are electric wheels (and therefore not self-propelled), and the device may be in a form in which the wheels rotate and move when the main body 10 is pushed or pulled by human power or the like.

[0047] Furthermore, as in the illustrated example, a configuration in which the main body 10 is long in the longitudinal direction of the existing tunnel 60A is preferable because this increases the posture stability of the main body 10 when the lining section 63 is introduced into the erector 30 or when moving within the existing tunnel 60A.

[0048] Although not shown in the figure, an auxiliary moving means may be provided on the other end 12 side of the main body 10 opposite the erector 30 so as to be freely movable along the wall surface of the tunnel.

[0049] In this embodiment, for example, when the erector 30 takes in the lining division 63, even if the main body 10 tilts toward the end 11 where the erector 30 is located due to the weight of the lining division 63, the auxiliary moving means, for example at the top, on the other end 12 side opposite the erector 30 can abut against the upper wall surface of the existing tunnel 60A. In other words, the main body 10 tilted by the weight of the lining division 63 can maintain a stable posture by the moving means 20A on the one end 11 side and the auxiliary moving means on the other end 12 side abutting the lower and upper parts of the wall surface of the existing tunnel 60A, and can move in this stable posture within the existing tunnel 60A to the shaft 70 (above, step B).

[0050] When the lining section 63 to be removed is taken into the existing tunnel 60A, as shown in FIG. 4, the removal device 50 is self-propelled in the Y1 direction to the vicinity of the lining section 63 to be removed and aligned.

[0051] 4 to 12 show a part of the existing tunnel 60A, and show only one ring 61, with the key lining division 63A at the top of the ring 61 already removed (taken in and carried out), and show the inside as a see-through view. Furthermore, the illustration of the shaft 70 is omitted (only the reference number is shown), and only the underground rack 75 at the entrance of the existing tunnel 60A is shown.

[0052] As shown in FIG. 4, a take-in jig 65 having bolt holes 65a is attached to the wall surface of the lining section 63 to be removed.

[0053] Next, as shown in FIG. 5, each outrigger 40 is extended in the X4 direction and its tip is fixed to the wall surface of the existing tunnel 60A, thereby maintaining the posture of the removal device 50.

[0054] Here, as shown in Figure 6, a worker P accesses the vicinity of the removal device 50 which has been aligned at a predetermined position, and performs operations such as driving the outriggers 40 and then the erector 30, as well as electrically driving the moving means 20 when transporting the lining section 63, using a controller or the like (not shown).

[0055] In order to connect the tip of the erector 30 to the take-in jig 65 attached to the lining division 63 to be removed, the erector 30 slides in the X2 direction in the longitudinal direction of the existing tunnel 60A relative to the main body 10, and precise position adjustment is performed. In other words, since precise position adjustment is possible by sliding the erector 30, it is not necessary to precisely align the removal device 50 to the lining division 63 to be removed at the beginning, and the effort and time required for this precise alignment can be saved.

[0056] For example, a worker P near the erector 30 can fine-tune the amount of sliding of the erector 30 while checking the positional relationship between the take-in jig 65 and the erector 30.

[0057] In addition, in the removal device 50, the erector 30 may not be slidably attached to the main body 10. In this configuration, the above-mentioned effects cannot be obtained, but the manufacturing costs of the device can be reduced.

[0058] After aligning the erector 30, as shown in FIG. 7, the erector 30 is rotated in the X1 direction so as to face the take-in jig 65.

[0059] Next, as shown in FIG. 8, the erector 30 is extended in the X3 direction toward the taking-in jig 65, and the worker P connects the bolt hole 65a of the taking-in jig 65 with a bolt hole (not shown) at the tip of the erector 30, and inserts a bolt to temporarily fix both of them.

[0060] Next, as shown in Figure 9, the erector 30, to whose tip the lining segment 63 is fixed, is retracted in the X3 direction, and the lining segment 63 is taken into the inside of the existing tunnel 60A.

[0061] Furthermore, as shown in Figure 10, the erector 30 is rotated in the X1 direction to move the lining segment 63 downward, and then the outrigger 40 is retracted in the X4 direction, and as shown in Figure 11, the moving means 20 is driven to move the removal device 50 in the Y2 direction toward the shaft 70.

[0062] In this way, by rotating the erector 30 to move the lining section 63 downward and then moving the removal device 50 to the shaft 70, a stable moving posture of the removal device 50 can be achieved when taking in and moving the lining section 63.

[0063] As shown in Figure 12, the erector 30 with the lining segment 63 fixed thereto is aligned with the upper opening 76 of the underground stand 75, and then the lining segment 63 is removed from the erector 30 and fixed to a hanging wire or the like (not shown) suspended from above the vertical shaft 70, and then the lining segment 63 is transported outside the site via the vertical shaft 70 (this is process C).

[0064] The above-mentioned process C is repeatedly performed for each lining section 63, and after the existing tunnel 60A is removed, the formed cavity S is backfilled with backfill soil RS such as liquefied treated soil, as shown in Figure 13, thereby completing the removal of the existing tunnel (process D).

[0065] According to the illustrated removal method using the removal device 50, for example, even if the existing tunnel has a small diameter, the existing tunnel 60A can be efficiently removed.

[0066] In addition, the present invention is not limited to the configuration shown here, and may be implemented in other embodiments in which other components are combined with the configurations and the like of the above-mentioned embodiment. In this regard, the present invention may be modified within the scope of the gist of the present invention, and may be appropriately determined according to the application form. [Explanation of symbols]

[0067] 10: Main unit 11: One end 12: Other end 20:Transportation 20A: Front wheel (means of transportation) 20B: Rear wheel (transportation means) 30: Erector 40: Outrigger 50: Existing tunnel removal device (removal device) 60: Existing tunnel 60A: Partial section (partial section of existing tunnel, existing tunnel) 61: Ring 63: Lining division body 63A: Key lining division body 65: Importing tool 65a: Bolt hole 66: First joint (joint) 67: Second connecting material (connecting material) 68: Groove 68a: Core drilling 70: Shaft 75: Underground platform 76: Top opening G: Ground KG: Ground improvement body S: hollow RS: Backfill soil P: Worker

Claims

1. An existing tunnel removal device that moves within an existing tunnel to remove a lining section formed by cutting an existing tunnel, A main body having one end and the other end in the longitudinal direction of the existing tunnel; A moving means provided on one end side and the other end side of the main body; A plurality of outriggers are provided on one end side and the other end side of the main body and are equipped with the main body so as to be freely extended and retracted in the radial direction of the existing tunnel; An existing tunnel removal device, characterized in that it has an erector that is rotatably attached to one end side of the main body and expands and contracts in the radial direction of the existing tunnel to introduce the lining section into the interior of the existing tunnel.

2. The existing tunnel removal device as described in claim 1, characterized in that the erector is attached to one end side of the main body so as to be freely slidable in the longitudinal direction.

3. The existing tunnel removal device as described in claim 1, characterized in that an auxiliary moving means is freely provided at the other end side of the main body opposite the erector so as to be movable along the wall surface of the tunnel.

4. A method for removing an existing tunnel, comprising the steps of: A process includes cutting the existing tunnel into a plurality of lining divisions, and maintaining the state of the existing tunnel with the plurality of lining divisions; A process B includes accommodating an existing tunnel removal device in the existing tunnel through a vertical shaft, the removal device including at least a main body, a moving means provided on the main body, and an erector rotatably attached to the main body; A process C in which the removal device is run inside the existing tunnel to align it, the lining division body is taken into the inside of the existing tunnel by the erector, and the removal device is moved to the vertical shaft to carry out the lining division body; A method for removing an existing tunnel, comprising: a step D of repeatedly carrying out the step C and backfilling the cavity formed by removing the existing tunnel with backfill soil.

5. The method for removing an existing tunnel as described in claim 4, characterized in that in step C, after the lining section is fixed by the erector, the erector is retracted into the inside of the existing tunnel, the erector is rotated to move the lining section downward, and then the removal device is moved to the vertical shaft.

6. 6. The method for removing an existing tunnel as described in claim 4 or 5, characterized in that in step A, the existing tunnel is cut into a plurality of rings of a predetermined width in the longitudinal direction, adjacent rings are connected with connecting materials, each ring is cut into a plurality of lining sections in the circumferential direction, and adjacent lining sections in each ring are connected with connecting materials, thereby maintaining the state of the existing tunnel, and then two grooves are constructed by multiple core boring at both ends of the key lining section that is located on the ceiling of each ring and is to be removed first.

7. 6. The method for removing an existing tunnel according to claim 4 or 5, further comprising a step E of carrying out ground improvement work around the existing tunnel prior to the step A.

Images