JPH0978992A - Tunnel repairing construction method and repairing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To repair a tunnel rationally and rapidly so as to shorten a construction period and to reduce construction cost, and improve the strength and capacity of the tunnel after repair. SOLUTION: In a tunnel repairing construction method of cutting a lining wall 3 of a tunnel 1 and lining a cut face, a plurality of lining reinforcing frames 23 are circumferentially attached to the cut face of the lining wall 3, and a filler is filled between the lining reinforcing frames 23 and the cut face of the lining wall 3. The lining reinforcing frames 23 are disposed on the inner surface of the tunnel 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a method of repairing a tunnel, which can repair a tunnel reasonably and promptly, shorten the construction period and reduce the construction cost, and improve the strength and ability of the tunnel after the repair. And the repair device.

[0002]

2. Description of the Related Art For example, a waterway tunnel for hydropower generation is
The inner surface is eroded over time by gravel and the like mixed into the water,
The fluid friction gradually increases and the loss of flow becomes remarkable,
It will be necessary to repair the tunnel regularly as it will affect the amount of power generated.

Conventionally, as a method of repairing a tunnel, for example, in Japanese Patent Laid-Open No. 7-42496, the inner surface of the tunnel is reinforced and then covered with concrete, and the lining surface is inwardly projected from the inner surface of the tunnel before repair. .

However, this repairing method requires the loading of a fishing machine and a lining device into the tunnel, and cannot be applied to a tunnel having a small inner cross-sectional area. In addition, a supporting work is required for lining concrete. The work is complicated because it requires assembly and wire laying, and the tunnel after repair has a defective section, which reduces the amount of water flow and the amount of power generated, which reduces the tunnel's capacity. , Etc.

[0005]

SUMMARY OF THE INVENTION The present invention solves such a problem and repairs a tunnel reasonably and promptly to shorten the construction period and cost, and at the same time, improve the strength and capacity of the tunnel after the repair. It is an object of the present invention to provide a tunnel repairing method and a tunnel repairing device capable of improving the maintenance.

[0006]

Therefore, according to the invention of claim 1, in a tunnel repairing method for cutting a lining wall of a tunnel and lining the cut surface, the cutting surface of the lining wall is surrounded by a circumference. Assembling a plurality of lining reinforcement frames in the direction, filling a filling material between the reinforcement frame and the cutting surface of the lining wall, disposing the lining reinforcement frame on the inner surface of the tunnel, and I try to improve the strength. According to the invention of claim 2, a plurality of lining reinforcement frames are assembled in an annular shape to enhance the strength of the repaired tunnel. The invention of claim 3 is suitable for repairing a tunnel having a circular inner cross section. According to the invention of claim 4, the lining reinforcement frame is made of synthetic resin to facilitate the production and the cost reduction, and to promote the weight reduction to facilitate the handling and the assembling work. . According to a fifth aspect of the present invention, the lining reinforcement frame is formed in a curved plate shape, and the reinforcing projections protruding on the outside thereof are embedded in the filling material to improve the rigidity of the lining reinforcement frame and at the same time as the filling material. We are trying to improve the integration of. According to the invention of claim 6, the inner surface of the lining reinforcement frame is made smooth, the surface roughness is reduced to reduce fluid friction, and is suitable for a tunnel for a waterway. I try to prevent it. Claim 7
In the invention of (1), the inner surface of the lining reinforcement frame is arranged at the same position as the inner surface of the tunnel before cutting to prevent a cross-section loss before and after the repair of the tunnel and prevent a decrease in the capability of the tunnel. According to the invention of claim 8, the adjacent lining reinforcement frames are engaged and connected to each other so that the assembling work of the reinforcement frames can be easily performed. In particular, when the lining reinforcement frame is made of synthetic resin, its handling is facilitated and the above-mentioned assembling work is facilitated. According to the invention of claim 9, a repair device including a front body and a rear body capable of performing peristaltic movement on the inner surface of the tunnel with the other end as a reaction end, and a cutter capable of cutting the lining wall is carried into the tunnel for construction, and the repair is performed. We are trying to realize the repair of the tunnel where the part cannot be used as the reaction end. According to the tenth aspect of the invention, the cutter is rotated in the circumferential direction along the inner surface of the lining wall so that the tunnel can be repaired efficiently. In the eleventh aspect of the present invention, the cutter is swiveled in a circular shape, and the repair of the tunnel having a circular inner cross section is rationally performed. According to a twelfth aspect of the present invention, there is provided a front body and a rear body capable of performing peristaltic movement on the inner surface of the tunnel with the other end as a reaction end, and a cutter capable of turning in the circumferential direction along the inner surface of the lining wall. A repair device suitable for repairing a tunnel that cannot be used as a reaction force end is provided. The invention of claim 13 embodies the front body and the rear body in a slidable manner, and connects them so as to be able to approach and separate from each other through a plurality of excavation jacks, and embodies a peristaltic mechanism of the front body and the rear body. ing. According to the fourteenth aspect of the present invention, the turning radius of the cutter can be adjusted so that cutting of repair parts of tunnels of various sizes can be performed. According to the fifteenth aspect of the present invention, the turning radius of the cutter can be adjusted within the range from the inner surface of the lining wall to the inner surface or more, so that the repair device can be carried into the tunnel and the repair portion can be cut. According to the sixteenth aspect of the present invention, the cutter can be rotated in a circular shape, which is suitable for repairing a tunnel having a circular inner cross section.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described with reference to the illustrated embodiment in which the present invention is applied to the repair of a small tunnel for a water channel. In FIGS. 1 to 7, reference numeral 1 is a tunnel for a water channel having a circular inner cross section. A concrete lining wall 3 which is a portion to be repaired is formed on the ground 2, and the inner surface of the wall 3 is cut by a repairing device 4. In the case of the embodiment, the inner diameter of the tunnel 1 is 205 cm to 235 cm, which is very small as compared with the railway and road tunnels.

The repair device 4 is composed of a front body 5 and a rear body 6 which are cylindrical bodies having substantially the same diameter as the inner surface of the lining wall 3, and the front end of the rear body 6 is located at the rear end of the front body 5. Slidingly fitted, both ends thereof are connected by a plurality of excavation jacks 7 which can expand and contract in the axial direction. A plurality of side jacks 8 are provided on the front body 5 so as to project outward, and a gripper plate 9 is connected to the tip of the jack 8 so that the inner surface of the lining wall 3 can be grounded. In the figure, 10 is a pitching jack projecting downward on the peripheral surface of the front body 5, and the tip of the pitching jack can be grounded on the inner surface of the lining wall 3.

A pair of cutter turning motors 11 such as hydraulic motors are provided at the front part of the front body 5, and a drive gear 12 is connected to the output shaft of the motors 11. It meshes with the ring gear 13. The ring gear 13 is rotatably provided around a shaft center of the front body 5 via a bearing 14, and a cutter 15 is movably provided on the gear 13 so as to be movable.

The cutter 15 is formed in a drum shape, and is equipped with a cutter driving motor and a speed reducer (not shown) inside thereof, and its base end portion is provided with a cutter position adjusting jack 1.
It is linked to 6. The cutter position adjustment jack 16
The ring gear 13 is provided so as to be extendable in the radial direction, and the position of the cutter 15 connected to the tip of the ring gear 13 can be adjusted in the above direction. In the case of the embodiment, the outer circumference of the cutter 15 extends from the inside of the front body 5 to the outside. It is adjustable.

In the figure, reference numeral 17 denotes a concave earth reservoir provided at the front end of the front body 5, and one end of an earth discharging pipe 18 communicating with a vacuum suction device (not shown) is arranged at the lower end of the earth reservoir 17 and the other. The end is piped to the rear of the rear body 6. Inside the rear body 6,
A ring-shaped erector 19 is rotatably provided around a shaft center of the rear body 6 via a guide 20, and has a plurality of suction members 21 at one end thereof, and in this embodiment, a base end of an erector 22 having a vacuum grip. The part is pivotally attached,
The lining reinforcement frame 23 carried into the rear body 6 is suction-held and is movable to a predetermined position.

In the case of the embodiment, the lining reinforcement frame 23 has a strong F. R. It is made of synthetic resin such as P, and this is tunnel 1
Is formed into an arc-shaped curved plate having substantially the same shape as the inner surface of the plate, the plate thickness thereof is 2.0 cm to 2.5 cm, and both ends in the axial direction thereof are provided with a protrusion 24 and a recess 25 which are engageable with each other. Are arranged in the rear body 6 in the circumferential direction and are adjacent to the lining reinforcement frame 2
The concave and convex portions 25 and 24 are engaged with each other to be assembled.

In the figure, reference numeral 26 denotes a reinforcing projection formed on the outer peripheral surface of the lining reinforcement frame 23, which is formed in a bead shape along the circumferential direction of the tunnel 1 and which is formed between the reinforcement frame 23 and the lining wall 3. A filler 27 such as mortar or concrete is filled in between. Two
Reference numeral 8 denotes a reverse tail seal projecting from the rear end of the rear body 6, which can close the gap between the lining wall 3 and the rear body 6 when backfilling the filler 27.

When the tunnel 1 is repaired by using the tunnel repairing method and apparatus constructed as described above, it is necessary to manufacture the lining reinforcement frame 23. In the case of the embodiment, since the lining reinforcement frame 23 is made of synthetic resin, the lining reinforcement frame 23 can be manufactured inexpensively and easily as compared with the conventional concrete or steel segment, and is light in weight, so that the handling is convenient. Become.

Next, when actually repairing the tunnel 1,
The repair device 4 is carried into the open end of the tunnel 1, and the gripper jack 8 and the pitching jack 10 are operated to press them against the inner surface of the tunnel 1 to fix the repair device 4.

After this, the cutter turning motors 11, 11
When the drive gears 12, 12 are rotated in the same direction, the ring gear 13 meshing with these gears 12, 12 rotates around the axis of the front case 5 and is integrated with the gears 13. The attached cutter 15 moves together with the gear 13 and turns in the circumferential direction of the tunnel 1.

On the other hand, before and after this, the cutter 15 is driven and rotated, and the cutter position adjusting jack 16 is operated to expand and contract by a required amount to cut the amount of cutting of the cutter 15 necessary for repairing the lining wall 3. adjust. In the case of the embodiment, the adjustment range of the cutter 15 is set from the maximum position where the outer surface of the cutter projects outside the front case 5 to the minimum position inside the front case 5 as shown in FIG.

After the above adjustment, while maintaining this state, the cutter 15 is rotated and swiveled in the circumferential direction of the tunnel 1 to cut and remove the uneven portion and the rough surface portion on the inner surface of the lining wall 3. In this case, since the cutter 15 turns in a perfect circle along the ring gear 13, its locus draws a perfect circle that is concentric with the ring gear 13, and cuts the inner surface of the lining wall 3 accurately and precisely. Moreover, since the above cutting allowance is suppressed to the minimum necessary for repairing the lining wall 3, the cutting amount is suppressed as much as possible in comparison with the repair method of cutting the lining wall 3 as much as possible. The construction work can be miniaturized and shortened, and construction safety can be secured.

Thus, when the cutter 15 makes one turn in the circumferential direction of the tunnel 1 and cuts the inner surface of the lining wall 3 by the width of the cutter 15, the cutter turning motors 11 and 11 are cut.
Is stopped, the turning of the cutter 15 is stopped, and the rotation of the cutter 15 is stopped. Then, the side jacks 9 and the pitching jacks 10 are reduced in size, these are separated from the lining wall 3, and then the excavation jack 7 is reduced in size,
The rear body 6 is pulled toward the front body 5 side with the front body 5 being the reaction force end, and the rear body 6 is drawn into the tunnel 1.

Next, the excavation jack 7 is extended, the rear body 6 is made the reaction end, and the front body 5 is pushed forward.
When the cutter 5 is moved forward by the same width as the cutter 5 is moved, the side jacks 9 and the pitching jacks 10 are extended and pressed against the lining wall 3 to fix the repair device 4.

After this, the cutter turning motors 11 and 11
Drive the cutter 15 in the circumferential direction of the tunnel 1, rotate the cutter 15 to rotate, and adjust the cutter position adjusting jack 16 to expand and contract in the same manner as described above to rotate the cutter 15 while rotating the cutter 15. It swivels in the circumferential direction, and cuts and removes the uneven portion and the rough surface portion on the inner surface of the lining wall 3.

Thus, when the cutter 15 makes one turn in the circumferential direction of the tunnel 1 and cuts the inner surface of the lining wall 3 by the width of the cutter 15, the cutter turning motors 11 and 11 are cut.
Is stopped, the turning of the cutter 15 is stopped, and the rotation of the cutter 15 is stopped. Then, the side jacks 9 and the pitching jacks 10 are reduced in the same manner as described above, after these are separated from the lining wall 3, the excavation jack 7 is reduced, and the rear body 6 is made the front body 5 with the reaction force end. The rear body 6 is pulled into the tunnel 1.

Next, the excavation jack 7 is extended, the rear body 6 is made the reaction end, and the front body 5 is pushed forward.
When the cutter 5 is moved forward by the same width as the cutter 5 is moved, the side jacks 9 and the pitching jacks 10 are extended and pressed against the lining wall 3 to fix the repair device 4.

After this, the cutter turning motors 11, 11
Drive the cutter 15 in the circumferential direction of the tunnel 1, rotate the cutter 15 to rotate, and adjust the cutter position adjusting jack 16 to expand and contract in the same manner as described above to rotate the cutter 15 while rotating the cutter 15. It swivels in the circumferential direction, and cuts and removes the uneven portion and the rough surface portion on the inner surface of the lining wall 3.

Thereafter, the repair device 4 alternately expands and contracts the front body 5 and the rear body 6 to move in the tunnel 1 while performing peristaltic movement, and at the same time, the cutting by the cutter 15 proceeds. In this case, since the lining reinforcement frame 23 made of synthetic resin is carried into the rear body 6, it is lighter than the conventional steel or concrete segment, and the movement of the rear body 6 is smooth and light. Therefore, it is possible to reduce the capacity of the excavation jack 7 for this purpose. Further, the cutting pieces fall to the bottom of the tunnel 1, which are scooped when the front body 5 advances and are stored in the soil pool 17, sucked by the soil discharge pipe 18 and carried out of the tunnel 1.

In this way, the lining wall 3 is cut by a predetermined width, and in the embodiment, when the lining wall 3 is cut by about 3 times the width of the cutter 15, the operator makes full use of the erectors 19 and 22 to make the lining reinforcement frame 2
Assemble 3. A predetermined amount of the lining reinforcement frame 23 is carried into the rear body 6, and its smooth inner surface, that is, the side opposite to the reinforcing protrusion 26 is held by the suction tool 21 via the erector 22, and then the erector 19 is rotated. , The erector 22 is rotated in the circumferential direction of the tunnel 1 to position the lining reinforcement frame 23 at a predetermined position on the lining wall 3 after cutting.

That is, the lining reinforcement frame 23 has reinforcement protrusions 26.
Is positioned inside the cutting surface of the lining wall 3 with the outer side being the outer side, and the inner surface thereof is arranged at the same position as the inner surface of the lining wall 3 before cutting, and the lining reinforcing frame 23 adjacent in the axial direction. On the other hand, the concavo-convex portions 24 and 25 are engaged and connected, and the lining reinforcement frame 23 adjacent to the circumference is assembled by abutting the end faces thereof.

As described above, when the lining reinforcement frame 23 is assembled, since the concavo-convex portions 24 and 25 are engaged and connected to each other, it is possible to simply carry out without the complicated bolt tightening work of the conventional segment. Moreover, since the reinforcing frame 23 is made of synthetic resin and lighter in weight than the solid and heavy-weight segment, the engaging work and the moving work thereof can be easily performed.

In this way, the lining reinforcement frame 23 is assembled in the rear case 6, and when it comes out of the rear case 6 as the rear case 6 moves forward and faces the cutting surface of the lining wall 3, an injection hose (not shown) is formed. ) Is inserted into a predetermined position of the lining reinforcement frame 23 on the top end side or the bottom side, and a filling material 27 such as mortar is attached to the hose.
And the filler 27 is pressed between the lining wall 3 and the lining reinforcement frame 23, and the reverse tail seal 28 and the filler 2 pre-cast.
Fill between 7 and. At that time, the space for placing the filling material 27 on the outer periphery of the rear end portion of the rear body 6 is closed via the reverse tail seal 28, and the filling of the filling material 27 before that portion is blocked.

The filling material 27 fills the inside of the casting space from below, and its injection pressure acts as a buckling load inside the lining reinforcement frame 23, that is, toward the center of the tunnel 1, while
The lining reinforcement frame 23 has rigidity improved by the reinforcement protrusions 26 provided on the outer side to counteract the above-mentioned buckling load.

The filling material 27 is hardened after filling, and the filling material 27
The reinforcement protrusions 26 of the lining reinforcement frame 23 are embedded in the lining reinforcement frame 23 to improve the integrity with the filling material 27, and the lining reinforcement frame 23
Since the inner surface of the tunnel 1 is supported by, it is possible to withstand a large bending stress, tensile load, and compressive load as compared with the conventional repair method using unreinforced concrete, and the tunnel strength is improved. Moreover, as described above, the buckling stress due to the injection pressure of the filling material 27 acts on the lining reinforcement frame 23, that is, the lining reinforcement frame 23 is placed in the prestressed state, so that this resists the water pressure of the water flowing in the tunnel 1. It can withstand high water pressure.

Further, since the inner surface of the lining reinforcement frame 23 is formed to have the same diameter as the inner surface of the tunnel 1 before cutting, there is no cross-section loss of the tunnel 1 before and after the repair, and the same amount of water transfer as before the repair. The amount of generated power can be obtained. Moreover, the inner surface of the lining reinforcement frame 23 in contact with the water is formed to be a smooth surface, which has a smaller surface roughness and can suppress the fluid friction compared to the conventional contact surface made of concrete. The amount of electric power can be secured.

Thus, the lining reinforcement frame 23 is assembled while cutting the inner surface of the lining wall 3, and the filling material 27 is back-filled and injected between the frame 23 and the lining wall 3 to repair the tunnel 1. .

[0034]

As described above, according to the first aspect of the present invention, a plurality of lining reinforcing frames are assembled in the circumferential direction on the cutting surface of the lining wall, and between the reinforcing frame and the cutting surface of the lining wall. Since the filling material is filled in and the lining reinforcement frame is arranged on the inner surface of the tunnel, the strength of the tunnel after repair can be improved as compared with the conventional repair method using unreinforced concrete. According to the invention of claim 2, since a plurality of lining reinforcement frames are assembled in an annular shape, the strength of the tunnel after repair can be enhanced.
The invention of claim 3 is suitable for repairing a tunnel having a circular inner cross section. According to the invention of claim 4, since the lining reinforcement frame is made of synthetic resin, the reinforcement frame can be manufactured easily, inexpensively and lightly, as compared with the conventional steel or concrete segment. It is possible to make the installation easier and the assembly work easier. According to the invention of claim 5, since the lining reinforcement frame is formed in a curved plate shape, and the reinforcing convex portion protruding on the outside thereof is embedded in the filling material, the rigidity of the lining reinforcement frame can be improved and the filling material and The integration of can be improved. In the invention of claim 6, since the inner surface of the lining reinforcement frame is made smooth, the surface roughness is reduced and the fluid friction is reduced, which is suitable for repairing a tunnel for a waterway, and the amount of water transfer and the generated power are reduced. Can be prevented. According to the invention of claim 7, since the inner surface of the lining reinforcement frame is arranged at the same position as the inner surface of the tunnel before cutting, it is possible to prevent a cross-section loss before and after the repair of the tunnel and prevent the deterioration of the tunnel performance.
In particular, this effect has an advantage of being able to prevent a decrease in the amount of water introduced and the generated power in repairing a tunnel for a waterway.
It is possible to eliminate the complexity of the bolt tightening work of the conventional segment and to easily perform the work of assembling the reinforcing frame. In particular, when the lining reinforcement frame is made of synthetic resin, there is an advantage that the lining reinforcement frame can be easily handled and the assembling work can be performed easily. According to the invention of claim 9, since a repair device including a front body and a rear body capable of peristaltic movement of the inner surface of the tunnel with the other end as a reaction end, and a cutter capable of cutting the lining wall is carried into the tunnel and constructed, It is possible to realize repair of a tunnel in which the repair section cannot be used as a reaction force end. According to the tenth aspect of the invention, since the cutter is rotated in the circumferential direction along the inner surface of the lining wall, the tunnel can be repaired efficiently. According to the eleventh aspect of the invention, since the cutter is rotated in a circular shape, it is possible to rationally perform repair of a tunnel having a circular inner cross section. The invention according to claim 12 is provided with a front body and a rear body capable of performing peristalsis on the inner surface of the tunnel with the other end as a reaction force end, and a cutter which can be rotated in the circumferential direction along the inner surface of the lining wall. It is possible to provide a repair device suitable for repairing a tunnel in which the above can not be used as a reaction force end. According to the thirteenth aspect of the present invention, the front body and the rear body are slidably fitted to each other and are connected to each other via a plurality of excavation jacks so that the front body and the rear body can be moved toward and away from each other. Can be realized in real time. According to the fourteenth aspect of the present invention, since the turning radius of the cutter can be adjusted, it is possible to cope with cutting of repair parts of tunnels of various sizes. According to the fifteenth aspect of the present invention, since the turning radius of the cutter can be adjusted within the range from the inner surface of the lining wall to the inner surface or more, it is possible to carry the repair device into the tunnel and cut the repair portion. it can. According to the sixteenth aspect of the invention, since the cutter can be rotated in a circular shape, there is an advantageous effect for repairing a tunnel having a circular inner cross section.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, showing a condition of tunnel repair work.

FIG. 2 is a sectional view showing an embodiment of a repair device of the present invention.

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is a right side view of FIG. 2;

FIG. 5 is an enlarged sectional view showing a repair part according to the present invention.

FIG. 6 is a perspective view showing an embodiment of a lining reinforcement frame applied to the present invention.

7 is a cross-sectional view taken along the line AA of FIG. 1, showing a slightly enlarged view.

[Explanation of symbols]

 1 tunnel 3 lining wall 4 repair device 5 front body 6 rear body 7 excavation jack 15 cutter 23 lining reinforcement frame 26 reinforcement protrusion 27 filling material

Claims (16)

[Claims] 1. A method for repairing a tunnel in which a lining wall of a tunnel is cut and the cut surface is lined, wherein a plurality of lining reinforcing frames are assembled in the circumferential direction on the cutting surface of the lining wall, and the reinforcing frame is provided. A repairing method for a tunnel, characterized in that a filling material is filled between the lining wall and the cut surface of the lining wall, and the lining reinforcement frame is disposed on the inner surface of the tunnel. 2. The method for repairing a tunnel according to claim 1, wherein a plurality of lining reinforcement frames are assembled in an annular shape. 3. The method for repairing a tunnel according to claim 1, wherein the inner cross section of the tunnel is circular. 4. The lining reinforcement frame is made of synthetic resin.
Tunnel repair method described. 5. The method for repairing a tunnel according to claim 4, wherein the lining reinforcement frame is formed in a curved plate shape, and the reinforcing protrusions protruding outside thereof are embedded in the filling material. 6. The method for repairing a tunnel according to claim 4, wherein the inner surface of the lining reinforcement frame is a smooth surface. 7. The tunnel repairing method according to claim 1, wherein the inner surface of the lining reinforcement frame is arranged at the same position as the inner surface of the tunnel before cutting. 8. The method of repairing a tunnel according to claim 2, wherein adjacent lining reinforcement frames are engaged and connected. 9. A repair device comprising a front body and a rear body capable of peristaltic movement on the inner surface of the tunnel with the other end as a reaction force end, and a cutter capable of cutting the lining wall, and carried into the tunnel for construction. Tunnel repair method. 10. The method for repairing a tunnel according to claim 1, wherein the cutter is rotated in the circumferential direction along the inner surface of the lining wall. 11. The cutter is rotated in a circular shape.
Tunnel repair method described in 0. 12. A repair device for a tunnel, comprising a front body and a rear body capable of peristaltic movement on the inner surface of the tunnel with the other end as a reaction force end, and a cutter which is rotatable in the circumferential direction along the inner surface of the lining wall. 13. The tunnel repairing device according to claim 12, wherein the front body and the rear body are slidably fitted to each other and are connected to each other via a plurality of excavation jacks so as to be able to approach and separate from each other. 14. The tunnel repair device according to claim 12, wherein the turning radius of the cutter is adjustable. 15. The tunnel repairing device according to claim 12, wherein the turning radius of the cutter can be adjusted within a range from below the inner surface of the lining wall to above the inner surface thereof. 16. The repair device for a tunnel according to claim 12, wherein the cutter is rotatable in a circular shape.