JP5148323B2 - Segment assembly apparatus and moving method thereof - Google Patents

Description

  The present invention relates to a segment assembling apparatus for assembling a lining segment along an inner surface of a tunnel hole formed by excavating a natural ground and a moving method thereof.

  As a method of constructing a tunnel in a rock that has a certain degree of independence, such as a bedrock, a tunnel hole is formed by excavating the ground with an excavator or the like, and the inner surface of the tunnel hole is covered with a lining segment. What is made is known. This method requires a segment assembling apparatus for assembling the segments in a ring shape along the inner surface of the tunnel hole.

  As such a segment assembling apparatus, a rail laid along the tunnel longitudinal direction at a tunnel bottom portion of a segment assembled in a ring shape along the inner surface of the tunnel hole (hereinafter referred to as an existing segment), and placed on the rail There has been known one provided with a carriage, a gripper provided on the carriage, and a segment assembly mechanism provided on the carriage (see Patent Document 1).

  According to this segment assembling apparatus, the gripper provided on the carriage is extended and the tip of the gripper is pressed against the inner surface of the existing segment to hold the carriage. In this holding state, the segment assembly mechanism provided on the carriage It can be gripped and connected to an existing segment along the inner surface of the tunnel hole and assembled into a ring shape.

JP-A-7-208081

  By the way, in the said segment assembly apparatus, since the rail is laid in the existing segment, the weight of the trolley | bogie on a rail and the weight of the segment assembly mechanism provided in the trolley will add to an existing segment via a rail. In addition, since the rail is laid on the existing segment, when the gripper provided on the carriage on the rail is extended, the tip of the gripper presses the inner surface of the existing segment, and the pressing force of the gripper is applied to the existing segment. End up.

  In this way, the weight of the carriage and segment assembly mechanism and the gripper's pressing force were applied to the existing segment.Therefore, to prevent the segment from being damaged, the rigidity of the segment was changed to earth pressure and water pressure of the natural ground. The cost of the segment was increased because it was necessary to increase the rigidity to withstand the weight of the carriage and the segment assembly mechanism and the rigidity to withstand the pressing force of the gripper.

  An object of the present invention created in view of the above circumstances is to provide a segment assembling apparatus and a moving method thereof in which the weight of a carriage and a segment assembling mechanism and the pressing force of a gripper are not applied to an existing segment.

In order to achieve the above object, a first invention is a segment assembling apparatus for assembling a lining segment along an inner surface of a tunnel hole formed by excavating a natural ground, and is provided at the bottom of the tunnel hole. A rail laid along the longitudinal direction, a carriage placed on the rail and moved along the rail, and an inner surface of the tunnel hole by gripping a segment provided at a rear end in the traveling direction of the carriage A segment assembling mechanism that moves to a predetermined position behind the carriage, and a gripper that is provided on the carriage and expands and contracts toward the inner surface of the tunnel hole and presses the inner surface of the tunnel hole when it is extended to hold the carriage When the gripping and moving jacks mounted at one end to the lower portion of the carriage moving the carriage along the rail, the rail is provided on the other end of the movement jack, or It is obtained by a clamping mechanism for release.

A second invention is a moving method of a segment assembling apparatus for assembling a lining segment along an inner surface of a tunnel hole formed by excavating a natural ground, and is along the longitudinal direction at the bottom of the tunnel hole. A carriage that is movable along the rail is placed on a rail that is laid, and a gripper provided on the carriage is extended toward the inner surface of the tunnel hole, and the inner surface is pressed by the gripper. In this holding state, the segment assembly mechanism provided at the rear end with respect to the traveling direction of the carriage grips the segment and is behind the carriage on the inner surface of the tunnel hole. It is moved to a predetermined position and assembled into a ring shape along the inner surface of the tunnel hole. After the assembly, the gripper is contracted to be separated from the inner surface of the tunnel hole. In order to form a space for assembling a new segment between the segment assembled in a ring shape and the carriage in this released state, the carriage is removed from the rail. The weight of the carriage and the segment assembly mechanism is supported at the bottom of the tunnel hole through the rail, not the segment assembled by the segment assembly mechanism, and the pressing force of the gripper is When the carriage is moved along the rail so that it is received not by the segment assembled by the segment assembly mechanism but by the inner surface of the tunnel hole, the movable jack attached to the lower part of the carriage is contracted to move the carriage. Grab the rail with the clamp mechanism provided at the tip of the arm and extend the moving jack in that state. Take the reaction force on the rail and push out the cart, then release the grip of the rail by the clamp mechanism, contract the moving jack to move the clamp mechanism forward in the moving direction of the cart, The same procedure is repeated to move the carriage along the rail .

  According to the segment assembling apparatus and the moving method thereof according to the present invention, the weight of the carriage and the segment assembling mechanism and the pressing force of the gripper are not applied to the existing segment. Therefore, the cost reduction of the segment can be promoted.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  1 is a side view of a segment assembling apparatus according to the present embodiment, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG.

  This segment assembling apparatus assembles a lining segment along the inner surface of a tunnel hole formed by excavating a natural ground.

  In the present embodiment, the tunnel hole 1 is formed by excavating a natural rock having a certain degree of independence, such as a rock mass, by an excavator or the like (not shown) arranged on the left side of FIG. The support 3 is disposed on the inner surface of the excavation hole 2 at a distance in the tunnel longitudinal direction, and concrete 4 such as mortar is sprayed on the inner surface of the excavation hole 2 in this state. However, if the self-supporting property of the natural ground is high, the supporting work 3 can be omitted, and if the self-supporting property of the natural ground is higher, the spraying of the concrete 4 may be omitted and the excavation hole 2 may be used as the tunnel hole 1 as it is.

  A segment assembling apparatus 6 for assembling the lining segment 5 along the inner surface of the tunnel hole 1 is placed on the rail 7 laid along the longitudinal direction at the bottom of the tunnel hole 1 and on the rail 7. A carriage 8 that moves along the rail 7, a segment assembly mechanism 9 that is provided on the carriage 8, holds the segment 5, and moves to a predetermined position on the inner surface of the tunnel hole 1, and an inner surface of the tunnel hole 1 that is provided on the carriage 8. And a gripper 10 that holds the carriage 8 by pressing the inner surface of the tunnel hole 1 at the time of extension.

  A pair of rails 7 are laid in parallel at the bottom of the tunnel hole 1 with an interval in the tunnel width direction. A carriage 8 is placed on the rail 7.

  The carriage 8 includes a traveling frame 12 having wheels 11 that travel on the rail 7, and a main body frame 14 mounted on the traveling frame 12 via an attitude control jack 13. A total of four posture control jacks 13 are arranged on the front and rear of the traveling frame 12 (in the tunnel longitudinal direction) and at intervals in the left and right (tunnel width direction). Each posture control jack 13 includes an upper and lower jacks 13a that expands and contracts in the vertical direction and a left and right jacks 13b that move the upper and lower jacks 13a in the left and right directions. The attitude control jack 13 adjusts the attitude and position of the main body frame 14 with respect to the traveling frame 12.

  As shown in FIG. 1, a moving jack 15 for moving the carriage 8 along the rail 7 is provided below the traveling frame 12. One end of the moving jack 15 is pivotally supported by a bracket 16 provided at the lower portion of the traveling frame 12, and a clamp mechanism 17 that grips the rail 7 is provided at the other end.

  According to this configuration, when the rail 7 is gripped from the left and right by the clamp mechanism 17 and the moving jack 15 is extended in that state, the traveling frame 12 moves forward (moves to the left in FIG. 1) with respect to the rail 7. . Thereafter, when the gripping of the rail 7 by the clamp mechanism 17 is released and the movable jack 15 is contracted, the position of the clamp mechanism 17 moves toward the bracket 16, so that the rail 7 is again gripped from the left and right by the advanced clamp mechanism 17. In this state, the carriage 8 advances along the rail 7 by repeating the process of extending the movable jack 15.

  A moving frame 18 that can move in the front-rear direction is attached to the front portion of the main body frame 14 of the carriage 8. The moving frame 18 is moved in the front-rear direction with respect to the main body frame 14 by a jack 19 having one end connected to the moving frame 18 and the other end connected to the main body frame 14.

  As shown in FIG. 2, a guide mechanism 20 is interposed between the moving frame 18 and the main body frame 14. The guide mechanism 20 includes a convex portion 20a provided on the main body frame 14 along the front-rear direction and a concave portion 20b provided on the moving frame 18 so as to engage with the convex portion 20a. This guides the frame 14 in the front-rear direction. In addition, you may change the recessed part 20b provided in the movement frame 18 into the wheel which drive | works along the convex part 20a. Further, the relationship between the concave portion 20b and the convex portion 20a may be reversed.

  The moving frame 18 is provided with a positioning jack 21 for fixing the position of the moving frame 18 in the front-rear direction with respect to the main body frame 14. When the positioning jack 21 is extended, the shoe 21a provided at the tip of the positioning jack 21 presses the side portion of the main body frame 14, and the position of the moving frame 18 in the front-rear direction with respect to the main body frame 14 is fixed.

  The carriage 8 is provided with a gripper 10.

  The gripper 10 includes a front gripper 10 a provided at the front part of the carriage 8 and a rear gripper 10 b provided at the rear part of the carriage 8.

  As shown in FIGS. 1 and 2, the front gripper 10 a includes an upper pusher 22 a provided on the upper part of the moving frame 18 with a space in the left-right direction, and a space on the side of the moving frame 18 in the vertical direction. And a lower pusher 24a provided at a lower portion of the main body frame 14 with a space in the left-right direction.

  As shown in FIGS. 1 and 3, the rear gripper 10 b includes an upper pusher 22 b provided on the upper portion of the main body frame 14 with a space in the left-right direction, and a side portion of the main body frame 14 with a space in the vertical direction. It has a side pusher 23b provided and a lower pusher 24b provided at a lower portion of the main body frame 14 with a space in the left-right direction.

  The pushers 22a, 23a, 24a, 22b, 23b, and 24b constituting the front gripper 10a and the rear gripper 10b expand and contract toward the inner surface of the tunnel hole 1, respectively, and press the inner surface of the tunnel hole 1 when contracted to contract. Sometimes separated from the inner surface of the tunnel hole 1.

  A segment assembly mechanism 9 is provided at the rear of the carriage 8.

  As shown in FIG. 4 which is a sectional view taken along line IV-IV in FIGS. 1 and 1, the segment assembly mechanism 9 includes a swiveling ring 25 supported at the rear portion of the main body frame 14 so as to be rotatable around the longitudinal axis of the tunnel. The suspension ring 25 has a substantially U-shaped suspension beam 26 movably attached to the tunnel radial direction, and a segment gripping portion 27 provided at the tip of the suspension beam 26 so as to be movable in the tunnel longitudinal direction.

  The swivel ring 25 is supported by a plurality of support rollers 28 arranged at intervals in the tunnel circumferential direction. These support rollers 28 are pivotally supported by an additional bracket 29 provided at the rear portion of the main body frame 14. The swiveling ring 25 supported by the support roller 28 is formed with a gear (not shown) in a ring shape along the circumferential direction thereof, and a pinion (not shown) attached to the rotating shaft of the motor. Is engaged. Thereby, the turning ring 25 is turned in the tunnel circumferential direction by driving the motor.

  The suspension beam 26 is formed in a substantially U shape, and guide rods 30 are provided at both ends thereof, and these guide rods 30 are inserted into a guide cylinder 31 attached to the turning ring 25. The suspension beam 26 is moved in the tunnel radial direction by a jack 32 having one end connected to the guide tube 31 and the other end connected to the suspension beam 26.

  The segment gripping part 27 is provided at the tip of the suspension beam 26 along the tunnel longitudinal direction, the moving block 34 movable along the guide member 33, and the segment 5 provided on the moving block 34 to grip the segment 5. And a gripping mechanism 35. The segment 5 gripped by the gripping mechanism 35 is moved in the tunnel longitudinal direction by moving the moving block 34 along the guide member 33 with a jack (not shown).

  As shown in FIG. 1, the carriage 8 is provided with a pressing jack 36 that expands and contracts toward an end surface of a segment 5 (hereinafter referred to as an existing segment) assembled in a ring shape by the segment assembly mechanism 9. A plurality of the pressing jacks 36 are provided on the additional bracket 37 provided at the rear part of the main body frame 14 at intervals in the circumferential direction of the tunnel. The pressing jack 36 presses the end form frame 38 (see FIG. 7) attached to the end 5a of the existing segment 5 rearward in the tunnel longitudinal direction at the time of extension, and a seal provided between the ends of the segment 5 (see FIG. (Not shown).

  As shown in FIG. 1, the carriage 8 is provided with a segment shape holding device 39 behind the segment assembly mechanism 9.

  Specifically, as shown in FIG. 5, which is a cross-sectional view taken along the line VV of FIGS. 1 and 1, the rear part of the main body frame 14 of the carriage 8 is inserted back and forth inside the swivel ring 25 of the segment assembly mechanism 9. An extension frame 14a is provided, and a segment shape holding device 39 is supported on the extension frame 14a.

  The segment shape holding device 39 includes an upper frame 40 formed in an inverted U shape, a lower frame 41 formed in a U shape, and one end connected to the upper frame 40 and the other end connected to the lower frame 41. And an actuating jack 42 that is closely spaced in the direction. The upper frame 40 is provided with a pad 43 that is pressed against the inner surface of the existing segment 5 and a support frame 44 that supports the weight of the segment shape holding device 39 on the extension frame 14a.

  The support frame 44 is placed on top of the extension frame 14a when the operation jack 42 is contracted as shown in the right half of FIG. 5, and is extended when the operation jack 42 is extended as shown in the left half of FIG. It is spaced upward from the upper part of the frame 14a. Specifically, a guide rail 45 is provided on the upper portion of the extension frame 14a along the longitudinal direction of the tunnel, and an engaging portion 46 that engages with the guide rail 45 is provided at the end of the support frame 44. Yes. As shown in FIG. 1, the segment shape holding device 39 is moved in the tunnel longitudinal direction by a moving jack 47 having one end connected to the upper frame 40 and the other end connected to the extension frame 14a.

  A counterweight 48 is attached to the front portion of the main body frame 14 of the carriage 8.

  The assembly of the segment 5 using the segment assembling apparatus 6 having the above configuration and the movement of the segment assembling apparatus 6 will be described with reference to FIGS.

  The operating jack 42 (see FIG. 5) of the segment shape holding device 39 shown in FIG. 6 is extended, the upper frame 40 is pressed against the upper inner surface of the existing segment 5, and the lower frame 41 is pressed against the lower inner surface of the existing segment 5. The shape of 5 is retained.

  As shown in FIG. 6, by extending each pusher 22a, 23a, 24a, 22b, 23b, 24b constituting the front gripper 10a and the rear gripper 10b, and pressing the tip of each pusher against the inner surface of the tunnel hole 1, The carriage 8 is held on the inner surface of the tunnel hole 1. Further, the positioning jack 21 provided on the moving frame 18 is extended, the shoe 21a (see FIG. 2) provided at the tip of the positioning jack 21 is pressed against the side of the main body frame 14, and the moving frame 18 is pressed against the main body frame 14 in the longitudinal direction of the tunnel. Fix immovable in direction. As a result, the main body frame 14 and the moving frame 18 of the carriage 8 are held on the inner surface of the tunnel hole 1.

  In this state, the segment assembly mechanism 9 connects the segment 5 to the end 5a of the existing segment 5 with a bolt and nut and assembles it into a ring shape.

  As shown in FIGS. 6 and 7, the end of the existing segment 5 newly assembled in a ring shape is a wife formed so as to close the gap between the outer peripheral surface of the existing segment 5 and the inner surface of the tunnel hole 1. The formwork 38 is attached. The pressing jack 36 is extended to press the end frame 38 against the end 5a of the existing segment 5, and a seal (not shown) interposed between the ends of the existing segment 5 is appropriately compressed.

  The operating jack 42 (see FIG. 5) of the segment shape holding device 39 in the state of FIG. 6 is contracted to separate the upper frame 40 and the lower frame 41 from the inner surface of the tunnel hole 1. The moving jack 47 of the segment shape holding device 39 is extended, and the segment shape holding device 39 is moved to the inner surface of the existing segment 5 newly assembled in a ring shape as shown in FIG. The operation jack 42 (see FIG. 5) of the segment shape holding device 39 is extended, the upper frame 40 and the lower frame 41 are pressed against the inner surface of the new existing segment 5, and the shape of the existing segment 5 is held.

  In this state, a backing material (mortar, cement, etc.) is injected from the inside of the existing segment 5 into the injection hole 5b formed by communicating the inner and outer surfaces with the existing segment 5. The injected backing material fills the space defined by the outer peripheral surface of the existing segment 5, the inner surface of the tunnel hole 1, the end form 38, and the backing material (not shown) that has been previously injected and solidified. And cured.

  As shown in FIGS. 7 and 8, the pressing jack 36 is contracted to be separated from the end form frame 38, and the pushers 22a, 23a, 24a, 22b, 23b, and 24b constituting the front gripper 10a and the rear gripper 10b are moved. Shrink and separate from the inner surface of the tunnel hole 1. Thereby, the holding of the carriage 8 on the inner surface of the tunnel hole 1 is released, and the carriage 8 can move along the rail 7.

  As shown in FIG. 7, the moving jack 15 provided at the lower portion of the carriage 8 is contracted, and the rail 7 is gripped by the clamp mechanism 17 provided at the end of the moving jack 15. Thereafter, the movable jack 15 is extended, and the carriage 8 is moved forward along the rail 7 as shown in FIG. Thereby, an assembly space S for a new segment 5 is formed in front of the existing segment 5.

  The forward movement position of the carriage 8 is a position where the pushers 22 b and 23 b of the rear gripper 10 b provided on the main body frame 14 of the carriage 8 press the concrete spraying portion between the support work 3 and the support work 3 on the inner surface of the tunnel hole 1. And At this time, when the pushers 22a and 23a of the front gripper 10a provided on the moving frame 18 are positions where the support 3 is pressed, the moving frame 18 is moved in the front-rear direction by the jack 19, and the pushers 22a, Let 23a be a position which presses the concrete spraying part between the supporter 3 and the supporter 3.

  This is because, if the pushers 22a and 23a press the support 3, there is a gap where no concrete exists in the back of the support 3 (if concrete is sprayed from above the support 3, the support 3 This is because there is a possibility that a gap in which concrete does not exist is generated in the back of the support work 3 and the support work 3 falls into the gap and cracks occur in the concrete around the support work 3. Since the support 3 does not extend downward to the position of the lower pushers 24a, 24b, the pushers 24a, 24b do not press the support 3.

  By the way, the rail 7 is laid not on the smooth existing segment 5 but on the inner surface of the tunnel hole 1 where some unevenness is unavoidable. The center of the segment assembly mechanism 9 provided on the main body frame 14 of the carriage 8 (the design center of the mechanism 9) is shifted from the center of the tunnel hole 1. In this case, it becomes difficult to accurately assemble the segment 5 with the existing segment 5 by the segment assembly mechanism 9.

  Therefore, the posture control jack 13 interposed between the traveling frame 12 and the main body frame 14 of the carriage 8 is operated, the posture of the main body frame 14 is made horizontal, and the horizontal position of the main body frame 14 is set to the center of the tunnel hole 1. The vertical position of the main body frame 14 is aligned with the center of the tunnel hole 1. Specifically, the vertical strokes of the upper and lower jacks 13a of the posture control jack 13 shown in FIGS. 2 and 3 are controlled to give a rotational moment to the main body frame 14 so that the posture is leveled. The expansion / contraction stroke of the jack 13b is controlled to move the main body frame 14 in the left-right direction, the left-right direction position is adjusted to the center of the tunnel hole 1, and the expansion / contraction stroke of each vertical jack 13a of the attitude control jack 13 is controlled. 14 is moved in the vertical direction so that the vertical position is aligned with the center of the tunnel hole 1.

  Thereafter, as shown in FIGS. 8 and 9, the pushers 22a, 23a, 24a, 22b, 23b, 24b constituting the front gripper 10a and the rear gripper 10b are extended to press the inner surface of the tunnel hole 1, The frame 14 is held on the inner surface of the tunnel hole 1. If the same stroke is extended by supplying the same hydraulic pressure to each pusher, the main body frame 14 is in a horizontal posture and the horizontal position and the vertical position are aligned with the center of the tunnel hole 1. It is held on the inner surface. Thereafter, the wife form frame 38 is removed from the end 5 a of the existing segment 5. Further, the upper and lower jacks 13b (see FIGS. 2 and 3) of the posture control jack 13 are contracted, the tip portions of the upper and lower jacks 13b are separated from the lower surface of the main body frame 14, and the load of the main body frame 14 is applied to the traveling frame 12. Do not. In this state, the segment assembly mechanism 9 precisely assembles the segment 5 in accordance with the existing segment 5, and thereafter the steps of FIGS. 6 to 9 are repeated.

  According to the segment assembling apparatus 1 and the moving method thereof according to this embodiment, the rail 7 is laid on the bottom of the tunnel hole 1, the carriage 8 is placed on the rail 7, and the gripper 10 and the segment assembling mechanism 9 are placed on the carriage 8. Since it is provided, the weight of the carriage 8 and the segment assembly mechanism 9 is supported at the bottom of the tunnel hole 1 via the rail 7 and does not add to the existing segment 5.

  In addition, since the gripper 10 is provided on the carriage 8 placed on the rail 7 laid in the tunnel hole 1, the tunnel hole 1 exists in the extension line in the extension direction of the gripper 10. Therefore, when the pushers 22a, 23a, 24a, 22b, 23b, and 24b of the gripper 10 are extended, the pressing force of the gripper 10 is applied to the inner surface of the tunnel hole 1 and is not applied to the existing segment 5.

  Thus, since the weight of the carriage 8 and the segment assembly mechanism 9 and the pressing force of the gripper 10 are not applied to the existing segment 5, the rigidity of the segment 5 is as long as it matches the earth pressure and water pressure of the natural ground. It is not necessary to have sufficient rigidity to withstand the weight of the carriage 8 and the segment assembly mechanism 9 and the pressing force of the gripper 10. Therefore, cost reduction of segment 5 can be promoted.

  Further, the pressing jack 36 presses the end frame 38 against the end 5 a of the existing segment 5, and applies a pressing force to the existing segment 5 to appropriately compress the seal interposed between the ends of the existing segment 5. However, the cart 8 is not moved forward by the pressing reaction force. Therefore, the pressing jack 36 does not apply an excessive compressive force necessary for advancing the carriage 8 to the existing segment 5 by the pressing reaction force, and the cost reduction of the segment 5 can be promoted.

It is a side view of the segment assembly apparatus which concerns on this embodiment. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is a side view which shows the process of the assembly of the segment using the segment assembly apparatus of FIG. 1, and the movement of a segment assembly apparatus. FIG. 7 is a side view showing a step following FIG. 6. FIG. 8 is a side view showing a step following FIG. 7. FIG. 9 is a side view showing a step following FIG. 8.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel hole 5 Segment 6 Segment assembly apparatus 7 Rail 8 Cargo 9 Segment assembly mechanism 10 Gripper S Space

Claims (2)

A segment assembly device for assembling a segment for lining along the inner surface of a tunnel hole formed by excavating a natural ground,
A rail laid along the longitudinal direction of the bottom of the tunnel hole;
A carriage mounted on the rail and moving along the rail;
A segment assembling mechanism that is provided at a rear end portion with respect to the traveling direction of the carriage and that grips the segment and moves to a predetermined position behind the carriage on the inner surface of the tunnel hole;
A gripper which is provided in the carriage and expands and contracts toward the inner surface of the tunnel hole, and holds the carriage by pressing the inner surface of the tunnel hole when extending .
A moving jack that has one end attached to the bottom of the carriage and moves the carriage along the rail;
A segment assembling apparatus comprising: a clamp mechanism that is provided at the other end of the movable jack and grips or releases the rail . A method of moving a segment assembling apparatus that assembles a segment for lining along the inner surface of a tunnel hole formed by excavating a natural ground,
On the rail laid along the longitudinal direction at the bottom of the tunnel hole, a carriage that can move along the rail is placed,
The gripper provided on the carriage is extended toward the inner surface of the tunnel hole, and the carriage is held on the inner surface by pressing the inner surface with the grippers,
In this holding state, the segment assembly mechanism provided at the rear end with respect to the traveling direction of the carriage grips the segment and moves it to a predetermined position behind the carriage on the inner surface of the tunnel hole to Assembled in a ring shape along the inner surface
After this assembly, the gripper is contracted and released from the inner surface of the tunnel hole to release the holding of the carriage on the inner surface of the tunnel hole,
In this released state, the carriage is moved along the rail to form a space for assembling a new segment between the ring-assembled segment and the carriage.
The weight of the carriage and the segment assembly mechanism is supported not at the segment assembled by the segment assembly mechanism but at the bottom of the tunnel hole via the rail,
The pressing force of the gripper is received not by the segment assembled by the segment assembly mechanism but by the inner surface of the tunnel hole ,
When moving the cart along the rail,
The moving jack attached to the lower part of the carriage is contracted and the rail is gripped by a clamp mechanism provided at the tip of the moving jack,
In that state, extend the moving jack and take the reaction force on the rail to push out the cart,
Thereafter, the grip of the rail by the clamp mechanism is released, the moving jack is contracted to move the clamp mechanism forward in the moving direction of the carriage,
Thereafter, the same procedure is repeated to move the carriage along the rail .

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