JPH108880A - Tunnel construction method and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a tunnel floor breakage or a passage closure due to a segment fall or a sediment outflow by separating a tunnel into three stages in the vertical direction, carrying a segment via lower stage space, discharging excavated sediment via intermediate stage space, and using upper stage space as workers' passage. SOLUTION: For constructing a tunnel 60 with a segment 4 built into an excavated hole under the operation of a shield machine 3 for excavating sediment, the excavated sediment is discharged outside on a screw conveyor 9 via the intermediate space 63 of the tunnel 60, and then the segment 4 is conveyed into the shield machine 3 via a segment transfer means 5 installed in the lower space 62 of the tunnel 60. Also, workers with the shield machine 3 walk in the upper space 64 of the tunnel 60 for access to and from the outside. As a result, even if the segment 4 falls from a traveling truck 28 or the like or the sediment flows out into the tunnel 60, the floor of the tunnel 60 is not damaged or a passage is not blocked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel construction method using a shield machine and an apparatus therefor.

[0002]

2. Description of the Related Art In the case of using a shield machine to excavate a vertically long and narrow tunnel in particular, there is a case where the excavation is performed while a middle pillar is hung on the left and right sides of the tunnel to reinforce it. In the case of such an excavation method, when the middle pillar is bridged vertically in two steps, the inner space of the tunnel is divided into three steps in the vertical direction by the middle pillar, so it is necessary to particularly efficiently use the work space. . For this reason, a method is used in which the upper and lower three-tiered space is used separately according to the purpose. Specifically, the upper space is used for discharging sediment, and the middle space is used for carrying in segments. The lower space is used for the movement of workers.

[0003] This is to facilitate the work of manually attaching the segment to the erector by using the central space as a space for carrying in the segment, and to incline the screw conveyor for discharging earth and sand upward to the outside. This facilitates the discharge of earth and sand.

[0004]

However, each space is separated only by the center pillars which are bridged on both the left and right sides of the tunnel. If the segment falls from a moving trolley, etc., or earth and sand flows out into the tunnel, the floor of the tunnel may be damaged or the passage may be blocked. Since a certain segment is manually attached to the erector, there is a problem that the operation is difficult.

Therefore, an object of the present invention is to solve the above-mentioned problems, and even if a segment falls from a moving trolley or the like or earth and sand flows into the tunnel, the floor of the tunnel is damaged or the passage is blocked. It is an object of the present invention to provide a tunnel construction method and a device which can easily attach a segment to an erector without any trouble.

[0006]

In order to achieve the above-mentioned object, the present invention divides a tunnel into three stages, upper and lower, to carry in a segment from a lower space thereof, to carry out excavated earth and sand through a middle space, and to allow an upper space to be worked by an operator. This is used as a passage.

[0007] Further, it is preferable that the segment carried in from the lower space is transferred to an erector provided in the shield machine through a relay means provided in the middle space.

[0008] The tunnel construction device is provided with an upper and lower erector provided in a vertically elongated shield frame, and a substantially rectangular segment running in a lower space of the vertically elongated tunnel constructed behind the shield frame. A segment truck on which the long side is grounded so that the short side is erected, and a relay which grips the segment on the segment trolley, turns so that the longer side is erected, and delivers it to the upper erector. It is preferable that the segment truck and the relay unit are arranged on the left and right sides of the vertically elongated tunnel along the side wall of the tunnel, respectively.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Although there are six types of segments in the present embodiment as shown in FIGS. 8 and 9, when any one is not specified, it is simply referred to as a "segment".

As shown in FIG. 1, inside the tunnel 60, a plurality of middle pillars 61 are stretched over right and left side surfaces.
Each of the middle pillars 61 is provided at a predetermined interval in the excavation direction and at a predetermined interval in the vertical direction,
The inner space of the tunnel 60 is provided in parallel in the excavation direction so as to be divided into three stages in the vertical direction. Among these spaces, a lower space 62 located at a lower portion is a space for loading the segment 4 using the segment transfer means 5 described later, and a middle space 63 located above the lower space 62 is a space for the screw conveyor 9 described later. The upper space 64 located above is a space used as an operator's passage.

As shown in FIGS. 1 to 4, a tunnel construction apparatus 1 includes a shield machine 3 having a shield frame 2 having a rectangular shape elongated vertically in a front view, and a segment for carrying a segment 4 into the shield machine 3. Transfer means 5,
A relay means 7 for transferring the segment 4 carried into the shield machine 3 by the segment transfer means 5 to a tunnel assembling means 6 in the shield machine 3.

The shield machine 3 includes a tunnel assembling means 6 for assembling the tunnel 60 by adding the segment 4 to the tunnel wall 8, a screw conveyor 9 for discharging the excavated earth and sand backward, and a shield as a means for moving the shield machine 3. With the jack 10 therein, the front end of the tunnel wall 8 (the excavation direction is set to the front) is pushed rearward by the shield jack 10 while excavating earth and sand in front of the shield excavator 3 with a cutter (not shown) so as to move forward. It has become.

The tunnel assembling means 6 comprises erectors 11 and 12 provided above and below the shield frame 2, respectively.

The upper erector 11, which is provided in the upper part of the shield frame 2 among these erectors 11, 12,
This is for assembling the segment 4 in the range from the ceiling to the upper side surface of the tunnel 60, and supports the engaging portion 13 for engaging and disengaging the segment 4 and the engaging portion 13 movably in the front-rear direction. A first support portion 14, a second support portion 15 for rotatably supporting the first support portion 14 in the vertical and horizontal directions when viewed from the front, and a third support portion for supporting the second support portion 15 so as to be movable in the horizontal direction when viewed from the front. It comprises a support portion 16 and a fourth support portion 17 for supporting the third support portion 16 movably in the vertical direction.

The first support portion 14 has a first cylinder 18 for moving the engaging portion 13 in the front-rear direction, and extends and contracts the first cylinder 18 which is a hydraulic cylinder so that the engaging portion 13 is moved in the front-rear direction. The engaging portion 13 is moved in the front-rear direction along a guide body (not shown) which is slidably supported.

The second support portion 15 rotatably supports the first support portion 14 and has a motor 19 for rotating the first support portion 14. The gear 20 provided integrally with the support portion 14 is rotated, and the engagement portion 13 is rotated together with the first support portion 14.

The third supporting portion 16 is a second rail for moving the second supporting portion 15 on a guide rail which is stretched on both left and right sides of the shield frame 2 and supports the second supporting portion 15 so as to be movable in the left and right direction. The cylinder 21 is provided, and the second support portion 15 can be moved in the left-right direction by expanding and contracting the second cylinder 21.

The fourth support portion 17 is provided so as to hang down from the upper end of the shield frame 2 and moves the third support portion 16 to a guide rail which supports the third support portion 16 so as to be vertically movable. The third cylinder (not shown) is provided, and the third support portion 16 can be moved in the vertical direction by expanding and contracting the third cylinder.

The lower erector 12 is a device for assembling the segment 4 from the floor of the tunnel 60 to the lower side surface thereof. A first support portion that supports the first support portion movably in the front-rear direction, a second support portion 15 that supports the first support portion rotatably in the vertical and horizontal directions when viewed from the front, and moves the second support portion 15 in the vertical direction Fifth support portion 23 that freely supports
And a sixth support portion 24 that supports the fifth support portion 23 movably in the left-right direction in front view.

The engaging portion 13, the first support portion 14, and the second support portion 15 are the same as those of the upper erector 11, and operate in the same manner as the upper erector 11.

The fifth support portion 23 is provided so as to rise upward from the lower end of the shield frame 2 and moves the third support portion 16 to a guide rail which supports the third support portion 16 so as to be vertically movable. The fourth support (not shown) is provided, and the third support 16 can be moved in the vertical direction by expanding and contracting the fourth cylinder.

The sixth support portion 24 is a fifth rail for moving the fifth support portion 23 on a guide rail which is stretched on both left and right sides of the shield frame 2 and supports the fifth support portion 23 so as to be movable in the left-right direction. The cylinder 26 is provided, and the sixth support portion 24 can be moved in the left-right direction by expanding and contracting the fifth cylinder 26.

The screw conveyor 9 is provided from the lower rear to the upper rear of the cutter (not shown), and sends out the sediment taken in from the lower rear of the cutter to the rear of the shield machine 3.

The segment transfer means 5 includes a track 27 laid in a lower space 62 of a tunnel 60 constructed behind the shield frame 2 and a segment 4 on the track 27.
A plurality of segment trucks 28 on which the vehicle is mounted, and supply trucks 29, 29 for passing the segments 4 delivered from the segment trucks 28 to the relay means 7,
It is provided in parallel on each of the left and right sides in the tunnel 60.

The track 27 comprises a pair of left and right rails,
It is laid from inside the tunnel 60 toward the inside of the shield frame 2.

The segment truck 28 is a truck for transporting the segment 4 from the rear inside the tunnel 60 to the supply truck 29, and includes a conveyor (not shown) on which the segment 4 is mounted so as to be able to be sent forward, and a segment truck. A side support plate 31 for supporting the placed segment 4 so as not to fall to the side. The side support plate 31 is provided for the segment truck 2
8 is provided so as to rise upward from the side end of the center of the tunnel 60, so that the segment 4 is tilted toward the center of the tunnel 60 so as not to drop from the segment truck 28. In addition, the segment carts 28 are connected in a line in the front-rear direction, respectively, so that the segments 4 on the conveyor can be transferred to each other.

The conveyor is of an endless track type (caterpillar type), and mechanically connects sprockets (not shown) to each other so that the segments 4 can be delivered and received smoothly without burdening the segments 4. So that there is no difference in transport speed.

The supply trolley 29 is a trolley having a lift table 32 for transferring the segment 4 to the relay means 7 and a sixth cylinder 33 for moving the lift table 32 upward while moving it forward. It is arranged at a position near the front end.

The lift table 32 is a table on which the segments 4 placed on the supply truck 29 are placed.
The support plate 34 is provided upright so as not to fall sideways. The sixth cylinder 33 is a hydraulic cylinder provided on the supply trolley 29, one end of which is fixed to the supply trolley 29 and the other end is rotatably attached to the support plate 34 of the lift table 32. The sixth cylinder 33 is fixed to the supply cart 29 with the upper end attached to the support plate 34 inclined forward, and the sixth cylinder 33 is extended to push out the lift table 32 while pushing the lift table 32 forward. The lift end 32 is returned to the supply carriage 29 by pushing up the front end of the upper end 32 and retracting the sixth cylinder 33.

The relay means 7 is a segment supply device 35 arranged near the front end of the middle space 63,
0 are disposed on the left and right sides, respectively. The segment supply device 35 includes an arm 36 for gripping and turning the segment 4 upward, a seventh cylinder 37 for turning the arm 36 in the vertical direction, and a base for supporting the arm 36 and the actuator 37. And a table 38.

The arm 36 is a rod-like body that is long in the front-rear direction, and is rotatably mounted on a base 38 with both ends protruding back and forth, so that both ends can be swung up and down. ing. The arm 36 is provided at its front end with a grip portion 39 for gripping the segment 4 so as to be detachable and rotatable, and has a rear end to which one end of a seventh cylinder 37 is rotatably connected. The arm 36 is provided with a motor 43 for rotating the grip 39.
The motor 43 has a sprocket (not shown) on its rotating shaft.
By driving the motor 43, the grip portion 39 is rotated via a chain (not shown).

The seventh cylinder 37 is a hydraulic cylinder having one end connected to the rear end of the arm 36 and the other end rotatably connected to the base 38, and extending the rear end of the arm 36 by extending the seventh cylinder 37. By pivoting upward and retracting, the rear end of the arm 36 is pivoted downward.

The base 38 is provided with a support portion 41 for supporting the arm 36 on a movable carriage 40 so as to stand up. The carriage 40 is capable of traveling in the front-rear direction, and has a seventh cylinder 37 near the rear end of the carriage 40.
Are rotatably connected. The support portion 41 is composed of two thick plates 42, 42 having a triangular shape in a side view.
An arm 36 is rotatably connected to the tops of the arms 2 and 42 in the front-rear direction via a rotating shaft (not shown).

Next, the operation will be described.

When the tunnel 60 is constructed by assembling the segment 4 into the hole excavated while excavating the earth and sand with the shield machine 3, the soil excavated by the shield machine 3 is transferred to the center of the tunnel 60 using the screw conveyor 9. Space 6
3 to the outside, and the segment 4
Is carried into the shield machine 3 using the segment transfer means 5 provided in the lower space 62 of the shield machine. In addition, the worker who works with the shield machine 3 is in the upper space 64 of the tunnel 60.
Walk back and forth with the outside.

At this time, even if the segment 4 falls from the moving segment truck 28 for some reason or the earth and sand flows out into the tunnel 60, the segment 4
Is transported through the lower space 62, so the tunnel 6
The floor of No. 0 is not damaged, and the upper space 64 is used as a passage for the worker, so that the passage is not blocked. For this reason, there is no hindrance to a manual recovery operation or the like, and no heavy object falls on the passage.

The assembling of the segments is performed in the order of (a) to (f) of FIGS. Then, the tunnel 60 is constructed by repeating the assembly in this order while moving in the excavation direction.

To explain this in detail, first, FIG.
As shown in (a), the floor segment 50 that forms the floor of the tunnel 60 is mounted on the bottom of the shield frame 2 at the center in the left-right direction. At this time, the floor segment 50
From the left segment supply device 35 to the lower erector 1
The lower erector 12 is turned in a direction indicated by an arrow 70 so that the engagement portion 13 is directed downward, and is directed in a predetermined direction, and is directly lowered in a direction indicated by an arrow 71.

Then, as shown in FIG. 8B, a lower right segment 51 forming the lower right side surface of the tunnel 60 is assembled. At this time, the lower right segment 51 is transferred from the right segment supply device 35 to the lower erector 12, moved to the right (in the direction of the arrow 72), and then moved to the arrow 7
It is lowered in the direction of 3 and assembled in a predetermined position.

Next, as shown in FIG. 8C, the lower left segment 52 forming the lower left side surface of the tunnel 60 is formed.
Assemble. At this time, the lower left segment 52 is transferred from the left segment supply device 35 to the lower erector 12, moved to the left (in the direction of arrow 74), then lowered in the direction of arrow 75, and assembled at a predetermined position. .

Next, as shown in FIG. 9D, an upper right segment 53 forming the upper right side surface of the tunnel 60 is assembled. At this time, the upper right segment 53 is passed from the right segment supply device 35 to the upper erector 11, and is raised in the direction of the arrow 76 and then to the right (arrow 77).
Direction) and assembled at a predetermined position.

Then, as shown in FIG. 9 (e), the ceiling segment 54 forming the ceiling surface of the tunnel 60 is attached to the upper left side of the upper right segment 53. At this time, the ceiling segment 54 is transferred from the segment supply device 35 on the left side to the upper erector 11, and the upper erector 11 is rotated in the direction of arrow 78 so that the engaging portion 13 faces upward. It is directed in a predetermined direction, and is raised in the direction of arrow 79 as it is.

Finally, as shown in FIG.
The upper left segment 55 forming the upper left side surface of the tunnel 60 is assembled. At this time, the upper left segment 55
From the left segment supply device 35 to the upper erector 1
After being raised in the direction of arrow 80, it is moved to the left (in the direction of arrow 81) and assembled at a predetermined position.

Next, the operation of assembling the segment 4 will be described in detail.

First, after the segments 4 including the lower right segment 51 are placed on the conveyor (not shown) of each segment truck 28 behind the tunnel 60, the segment truck 28 is moved to a position close to the supply truck 29. The vehicle travels in the lower space 62 of the tunnel 60. At this time, each of the segments 4 is placed upright on the segment cart 28, and the segment carts 2 running in parallel with each other.
Do not disturb the running of 8 competitors. In addition, while the segment truck 28 may be slightly shaken during traveling, the side support plate 31 is provided at the center side end of the tunnel 60 of the segment truck 28 so as to be erected upward, and Since the segment truck 28 travels along the wall surface of the tunnel, the segment 4 does not fall to the side and fall.

When the segment truck 28 approaches the supply truck 29 disposed near the front end of the track 27, the conveyor on the segment truck 28 is driven to transfer the segment 4 onto the supply truck 29. At this time, since the conveyors are connected and rotated, the segments 4 placed on the leading segment truck 28 are transferred onto the supply truck 29 and the subsequent segment trucks 2
The segment 4 placed on the segment 8 is transferred onto the segment truck 28 located immediately before. In addition, since there is no speed difference between the respective conveyors, friction does not occur between the transfer destination conveyor and the segment 4 when the segment 4 is transferred, and the segment 4 is transferred smoothly. Becomes

When the segments 4 have been transferred onto the supply carriage 29, the conveyor is stopped, and as shown in FIG. 5, the sixth cylinder 33 is extended to push the lift base 32 forward while raising the front end of the lift base 32 upward. To lift. At this time, the lift base 32 is horizontally moved forward while sliding the rear end on the supply cart 29, and is inclined such that the front end is raised upward. Then, the segment 4 on the lift table 32
Will be approached to the arm 36 of the segment supply device 35.

When the segment 4 is sufficiently close to the arm 36, the grasping portion 39 grasps the segment 4, and as shown in FIG.
Is turned upward (in the direction of arrow 82). At this time, by retracting the seventh cylinder 37, the rear end of the arm 36 is pulled down, and the front end is
Is pivoted upward about the fulcrum.
The segment 4 gripped by is rotated upward. In addition, the segment 4 that has been turned upward changes its posture so as to erect its long side portion, and
1 will be moved to the vicinity.

Then, the upper erector 11 is connected to the segment 4
And move it to a position where it can engage
Is engaged with the segment 4.

At this time, the segment 4 is the upper right segment 53, the ceiling segment 54 or the upper left segment 5
In the case of 5, the upper erector 11 is moved to a predetermined position,
Attach segment 4. At this time, the upper erector 11
The up and down movement is performed by extending and contracting the third cylinder, and the left and right movement is performed by extending and contracting the second cylinder 21 to move the second support portion 15 in the left and right direction. The first cylinder 18 is expanded and contracted to move the engaging portion 13 in the front-rear direction, and the rotation is performed by driving the motor 19 to rotate the first support portion 14 together with the gear 20.

The segment 4 is the floor segment 5
In the case of 0, lower right segment 51 or lower left segment 52, as shown in FIG.
The segment 4 is temporarily lifted up to a position where it does not interfere with the supply trolley 29, and after the supply trolley 29 retreats, moves to a position to pass to the lower erector 12, and the engaging portion 13 of the lower erector 12 can be engaged with the segment 4. Adjust to At this time, since the positioning cannot be performed only by moving the lower erector 12, the positioning is performed while the posture is corrected so that the segment 4 is erected by rotating the grip portion 39. The rotation of the grip 39 is performed by the motor 43. The driving force of the motor 43 is transmitted to the grip 39 via a sprocket and a chain (not shown), and the grip 39 is rotated at an arbitrary angle. The vertical movement of the lower erector 12 is performed by extending and contracting the fourth cylinder, and the third support 1
6 is moved up and down.

Then, the segment 4 is connected to the lower
And disengaged from the segment supply device 35,
The lower erector 12 is moved to a predetermined position, and the segment 4 is assembled. At this time, the left and right movement of the lower erector 12 is performed by expanding and contracting the fifth cylinder 26 to move the sixth support portion 24, and the movement in the front and rear direction is
The first cylinder 18 is expanded and contracted to move the engaging portion 13 in the front-rear direction, and the rotation is performed by driving the motor 19 to rotate the first support portion 14 together with the gear 20.

As described above, the tunnel 4 is divided into three stages, upper and lower, the segment 4 is carried in from the lower space 62, the excavated earth and sand is carried out through the middle space 63, and the upper space 64 is used as a passage for workers. Even if the segment 4 falls from the moving segment cart 28 or the earth and sand flows into the tunnel 60, the floor of the tunnel 60 can be prevented from being damaged, and the passage can be prevented from being blocked. In addition, it is possible to prevent a heavy object from falling on the passage.

The segment 4 carried in from the lower space 62 is transferred to the upper erector 11 and the lower erector 12 provided in the shield machine 3 via the relaying means 7 provided in the middle space 63. Therefore, the segment 4 is divided into the upper erector 11 and the lower erector 12
Can be easily attached to the vehicle.

Then, the tunnel construction apparatus 1 travels in the lower space 62 of the vertically elongated tunnel 60 built behind the shield frame 2 and the erectors 11 and 12 provided above and below in the vertically elongated shield frame 2. A segment cart 28 for placing the substantially rectangular segment 4 so that its long side is grounded and its short side is raised.
And the relay means 7 which grips the segment 4 on the segment truck 28 and turns it so that the long side thereof stands up and transfers it to the upper erector 11, so that when constructing the tunnel 60, heavy A certain segment 4 can be transported or supported almost completely by a machine, and the segment 4 can be efficiently assembled.

Further, since the segment truck 28 and the relay means 7 are arranged on the left and right of the vertically elongated tunnel 60 along the side wall of the tunnel 60, the segment 4 can be efficiently delivered to the upper erector 11. Work can be done quickly.

The segment 4 is connected to the segment truck 28.
Since it is conveyed while standing upright, a narrow space can be effectively used.

An arm 36 for turning the relay means 7 upward while gripping the segment 4, a seventh cylinder 37 for turning the arm 36 vertically, and a base for supporting the arm 36 and the actuator 37. Since the segment supply device 35 includes the segment supply device 35, the segment 4 can be transferred to the upper erector 11 with a simple device, and a narrow space can be effectively used.

[0060]

In summary, according to the present invention, the following excellent effects can be obtained.

(1) According to the first aspect of the invention, it is possible to prevent a heavy object from falling into the passage and closing the passage.

(2) According to the second aspect of the invention, the operation of attaching the segment to the erector can be facilitated.

(3) According to the third aspect of the invention, segments can be efficiently assembled.

(4) According to the fourth aspect of the invention, the segments can be efficiently transferred to the erecta.

[Brief description of the drawings]

FIG. 1 is a side view of a tunnel construction apparatus showing a preferred embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is an explanatory diagram of an operation of the tunnel construction device showing a segment transfer operation.

FIG. 6 is an explanatory diagram of the operation of the tunnel construction device following FIG. 5;

FIG. 7 is an explanatory diagram of the operation of the tunnel construction device following FIG. 6;

FIG. 8 is a VIII-VIII diagram of FIG.
FIG.

FIG. 9 is a sectional view taken along line VIII-VIII of FIG. 1 following FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel construction apparatus 2 Shield frame 3 Shield excavator 4 Segment 7 Relay means 11 Upper erector (Electa) 12 Lower erector (Electa) 28 Segment truck 60 Tunnel 61 Middle pillar 62 Lower space 63 Middle space 64 Upper space

Continued on the front page (72) Inventor Taiji Morita 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Osamu Watanabe 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. Inside the company (72) Inventor Osamu Mochizuki 1-25-1, Nishi Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Toshimi Ino 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd.

Claims (4)

[Claims] 1. A tunnel construction method wherein a tunnel is divided into upper and lower stages, a segment is carried in from a lower space thereof, excavated earth and sand is carried out through a middle space, and an upper space is used as a passage for an operator. 2. The tunnel construction method according to claim 1, wherein the segments carried in from the lower space are transferred to an erector provided in the shield machine via a relaying means provided in the middle space. 3. An upper and lower erector provided in a vertically elongated shield frame, and a substantially rectangular segment running in a lower space of a vertically elongated tunnel constructed behind the shield frame and having a substantially rectangular segment. And a relay unit that holds the segment on the segment truck so that the short side thereof stands up, and a relay unit that grips the segment on the segment truck and turns so that the long side of the segment truck stands up, and transfers the segment to the upper erector. A tunnel construction apparatus characterized by the above-mentioned. 4. The tunnel construction apparatus according to claim 3, wherein the segment truck and the relaying means are respectively arranged on the left and right of the vertically elongated tunnel along the side wall of the tunnel.