JPH1088990A - Segment erector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the operability and safety for a segment assembly operation when a segment is assembled to the interior wall surface of an existing tunnel. SOLUTION: A guide frame 35 mounted on a grip device 26a is provided with a safety pin 49 which fits into a grout hole S1a in a segment 81, and also with a position detector which detects the fitting and removal of the safety pin 49 in and from the grout hole S1a. A vacuum pad 44b that can suck and hold the segment S1 is mounted on the outer surface of the guide frame 35, a negative pressure generator 51 is connected to the vacuum pad 44b, and a control device 67 sets the negative pressure force of the negative pressure generator 51 according to the result of detection by the position detector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment erector device for attaching a segment to an inner wall surface of an existing tunnel formed by a tunnel excavator.

[0002]

2. Description of the Related Art FIG. 8 schematically shows a conventional general shield excavator.

As shown in FIG. 8, in a shield excavator for excavating the ground, a cutter head 102 is rotatably mounted in front of a cylindrical skin plate 101 as an excavator body. Spokes 103 are fixed radially to the front surface of the head 102, and a number of cutter bits 104 are fixed to the spokes 103. A ring gear 105 is fixed to the rear of the cutter head 102 while the skin plate 101 is fixed.
A hydraulic motor 106 is mounted on the hydraulic motor 1.
A drive gear 107 is meshed with the ring gear 105. Accordingly, when the hydraulic motor 106 is driven to rotate the drive gear 107, the cutter head 102 can be rotated via the ring gear 105.

[0004] A bulkhead 108 is mounted on the skin plate 101 behind the cutter head 102, and a chamber chamber 109 is formed between the cutter head 102 and the bulkhead 108. One end of the chamber chamber 109 is open at the other end of the sludge pipe 110 and the sludge pipe 111 extending outside the shield excavator. An agitator 112 for stirring and mixing earth and sand and muddy water is provided.

[0005] Further, a plurality of shield jacks 113 are juxtaposed in the circumferential direction around the rear outer periphery of the skin plate 101, and the shield jacks 113 extend rearward in the excavating direction of the shield excavator and excavate in a tunnel. By pressing against an existing segment S (not shown) built on the peripheral surface, the skin plate 101, ie,
The entire shield excavator can be advanced. On the other hand, a segment elector 114 is provided at the center of the rear portion of the skin plate 101.
The tunnel 14 can be constructed by mounting a new segment S in a space between the skin plate 101 advanced by the shield jack 113 and the existing segment S.

Therefore, as shown in FIG. 8, in order to excavate and form a tunnel, first, a plurality of shield jacks 113 are formed.
And the skin plate 101 is advanced by the reaction force against the existing segment S, while the cutter head 102 is rotated by the hydraulic motor 106, and the ground in front is excavated by the multiple cutter bits 104. The excavated earth and sand excavated by the cutter bit 104 is taken into the chamber 109, supplied with water from a mud pipe 110, and agitated by the agitator 112 so that the excavated earth and sand are agitated.
They are mixed and discharged to the outside by a drain pipe 111. Next, one of the shield jacks 113 is operated in the contracting direction to form a space between the shield jack 113 and the existing segment S, and a new segment S is mounted in the space by the segment elector 114. By repeating this operation, a tunnel of a predetermined length is excavated and formed.

The segment S is transported into an existing tunnel by a carrier (not shown) or the like, and the grip device of the segment elector 114 moves in the tunnel while holding the transported segment. Then, this segment is assembled at a predetermined position on the inner wall surface of the tunnel. In this case, in the related art, a holding pin provided in the grip device is fitted and held in a holding hole in which a segment is formed, so that the segment can be held and lifted. However, such a segment elector 114 has problems such as a decrease in the effective hollow diameter in the existing tunnel, an increase in the size of the device, and a complicated operation. In order to solve these problems, there is, for example, one disclosed in Japanese Utility Model Laid-Open No. 2-50500.

In the vacuum segment gripper disclosed in this publication, a drum is provided at the rear of the tunnel excavator, the drum being movable back and forth in the excavation direction, and the drum is provided with a swivel wheel which is rotatable in the front and rear directions in the circumferential direction. A gripper device is provided on each of the revolving wheels so as to be movable in the front-rear direction and in the radial direction. The gripper device has three segmented holding plates, each of which is provided with a safety jack and a vacuum pad. Therefore, while holding the vacuum pad of the segment holding plate in contact with the segment and holding it by suction, and operating the safety jack to insert the safety pin, the held segment is moved to a predetermined position and moved to the inner wall surface of the tunnel. Will be assembled.

[0009]

However, in the vacuum segment gripping device disclosed in Japanese Utility Model Laid-Open Publication No. 2-50500, as described above, the vacuum pad of the segment holding plate attracts the segments and the safety jack is removed. Activating and inserting the safety pin can hold this segment. In this case, the safety pin is fitted into the segment to prevent positioning of the segment and lateral displacement of the segment. This safety pin is inserted into the segment by operating the safety jack.If the position of the safety pin and the hole of the segment do not match, the safety pin cannot be inserted into the segment. Due to the drop of the segment. For this reason, conventionally, the worker visually checks the insertion of the safety pin into the segment, but such a work places a heavy burden on the worker, becomes cumbersome, and requires a long working time. There was a problem that it would.

Further, in a state where the vacuum pad of the segment holding plate is in contact with the segment, the space portion of the vacuum pad is evacuated by operating the solenoid valve to suck the segment. In this case, if a sufficient suction force cannot be obtained due to damage to the vacuum pad or the like, the held segments may be displaced or fall down during assembly.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a segment erector device which improves the operation and safety of a segment assembling operation.

[0012]

According to a first aspect of the present invention, there is provided a segment erector apparatus having a turning ring provided at a rear portion of a tunnel excavator, the turning ring being rotatable along a circumferential direction of a tunnel excavated. A grip device movable along the radial direction of the existing tunnel is attached to the revolving ring via a support extending in the rear part of the excavation direction, and the grip device holds a segment carried into the existing tunnel. In a segment elector device to be mounted on an inner wall surface of a tunnel, a guide frame mounted on the grip device and shaped according to the shape of the segment, and movably provided on the guide frame and fitted into a holding hole of the segment. A safety pin for assisting the holding of the segment, and fitting and removing the safety pin into a holding hole of the segment. A position detector that emits, a vacuum pad mounted on the outer surface of the guide frame and capable of holding the segment by suction, a negative pressure generator connected to the vacuum pad, and a detection result of the position detector. And a control device for setting a negative pressure of the negative pressure generator.

Accordingly, the grip device moves with respect to the segment carried into the existing tunnel, and the grip device moves the safety pin to the segment with the guide frame approaching the segment and the vacuum pad closely contacting the segment. When the negative pressure generator is actuated while being inserted into the holding hole, the vacuum pad sucks and holds the segment, and at this time, the position detector detects the fitting and removal of the safety pin from the holding hole of the segment and controls the position. When the device confirms the insertion of the safety pin, the device sets the negative pressure of the negative pressure generator, and the grip device can reliably hold the segment. Thereafter, the grip device moves in the longitudinal direction, the radial direction, and the circumferential direction of the tunnel while holding the segment, and assembles the held segment at a predetermined position on the inner wall surface of the tunnel.

In the segment elector apparatus of the present invention, the vacuum pad is divided into a plurality of parts, each of the vacuum pads and the negative pressure generator are individually connected to a pipe, and an electromagnetic valve and a pressure detector are connected to each of the pipes. The control device sets the negative pressure of the negative pressure generator based on the detection results of the position detector and the pressure detector, and performs an opening / closing operation of the electromagnetic valve. Things.

Therefore, the control device sets the negative pressure of the negative pressure generator based on the detection results of the position detector and the pressure detector and opens and closes the solenoid valve. When the vacuum pad is damaged, the pressure detector detects the negative pressure. The control device confirms that the vacuum pad has been damaged, closes the corresponding solenoid valve, resets the negative pressure of the remaining vacuum pad, and ensures that the vacuum pad holds the segment.

Further, in the segment elector device of the present invention, a plurality of grip devices are provided on the support, and each of the plurality of grip devices has a guide frame set in accordance with a segment having a different shape. A vacuum pad which is controllable and movably supported along the front-rear direction of the existing tunnel, and which can hold the segment by suction is mounted on the outer surface of each guide frame.

Accordingly, the grip device corresponding to the plurality of types of segments carried into the existing tunnel moves, and the grip device is adapted to move the guide frame adapted to the segment closer to the vacuum surface mounted on the outer surface. By operating the negative pressure generator while the pad is in close contact with the segment, the vacuum pad can reliably hold the segment by suction.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic side view showing a state in which a segment erector device according to an embodiment of the present invention is mounted on a shield excavator, FIG. 2 is a front view of the segment erector device, and FIG. 4, FIG. 4 is an IV-IV section of FIG. 3, FIG. 5 is a VV section of FIG. 4, FIG. 6 is an arrangement of a vacuum pad mounted on a guide frame, and FIG. 7 is a schematic diagram of a negative pressure pipe to the vacuum pad. Show.

The shield excavator to which the segment elector device of the present embodiment is mounted is substantially the same as that described in the above-mentioned prior art, and a detailed description thereof will be omitted.

As shown in FIGS. 1 and 2, a ring-shaped fixing plate 12 is fixed to a rear portion of a cylindrical skin plate 11 constituting a body of an excavator in a segment erector apparatus 10 of the present embodiment. The fixed plate 12 is provided with a plurality of shield jacks 13 arranged in parallel in the circumferential direction. The fixing plate 12 is provided with a radial roller 15 along a circumferential direction via a support bracket 14, and the radial roller 15
Are rotatably supported.
7 are formed. A hydraulic motor 19 is fixed to the fixed plate 12 by a bracket 18. The drive gear 20 of the hydraulic motor 19
7 is engaged.

A support block 21 extends rearward on both left and right sides of the swivel ring 16 in the excavation direction, and a support cylinder 22 is fixed to each of the left and right support blocks 21. Front and rear two guide rods 23a and 23b are respectively fitted to the left and right support cylinders 22 so as to be movable along the radial direction of the existing tunnel, and the front guide rod 23a is connected on both sides by a lower arm 24a, and the rear guide rod 23a. The guide rod 23b is connected on both sides by an upper arm 24b. The arms 24a and 24b are connected to the support cylinder 2
2 can be moved by the lifting jacks 25a and 25b attached to the second jack. The lower arm 24a thus supported is provided with a first grip device 26a holding a wide segment S1 and the upper arm 24b is mounted with a second grip device 2 holding a narrow segment S2.
6b is mounted.

Therefore, when the hydraulic motor 19 is driven to rotate the drive gear 20, this drive gear 20
The first grip device 26a and the second grip device 26b can be moved in the circumferential direction along the inner peripheral surface of the existing tunnel by rotating the swivel ring 16 by meshing with. At a predetermined position, the lifting jack 25a or 25b
By expanding and contracting, the first grip device 26a or the second grip device 26b can be moved radially with respect to the inner peripheral surface of the existing tunnel via the arms 24a and 24b.

The first grip device 26a and the second grip device 26a
The grip device 26b includes the segments S1, S to be held.
2 are different from each other only in the size of a guide frame and the mounting position of a vacuum pad, which will be described later, and the other structures are almost the same.
Only the grip device 26a will be described in detail.

In the first grip device 26a, as shown in FIGS. 3 to 6, a box-shaped elevator 31 is fixed to the center of the lower arm 24a, and a slide rod is mounted inside the elevator 31. Slide box 3 by 32
3 is movably fitted to the slide box 3
3 can be moved by a slide jack 34. The guide frame 35 is formed in substantially the same size as the segment S1 and has a substantially identical curved surface so as to hold the segment S1 having a large width.

A support plate 36 projects from the lower left portion of the slide box 33, and a support plate 37 projects from the upper left portion of the guide frame 35.
6, 37 are connected via a rolling shaft 38 and a spherical bearing 39. On the other hand, a support base 40 is formed on the lower right side of the slide box 33, and a rolling jack 41 is mounted on the upper left side of the guide frame 35. The tip of the driving rod of the rolling jack 41 is attached to the support base 40. Are linked. Also, pitching jacks 42 are provided at the front and rear lower portions of the guide frame 35, respectively.
The tip of the drive rod of each pitching jack 42 is connected to the support 40.

Therefore, the rolling of the guide frame 35 can be adjusted by expanding and contracting the rolling jack 41, and the pitching of the guide frame 35 can be adjusted by expanding and contracting each of the pitching jacks 42. It can be carried out.

On the outer surface of the guide frame 35, a pad plate 43 having the same size as the guide frame 35 is fixed by bolts or the like (not shown). Pads 44a, 44b, 44c are attached. The vacuum pad 44a, 4
The suction holes 45a, 45a,
45b and 45c are formed.
A negative pressure generator 51 (see FIG. 1) is connected to a, 45b, and 45c.

Here, the suction holes 45a, 45 of the vacuum pads 44a, 44b, 44c are supplied from the negative pressure generator 51.
The pipes b and 45c will be described in detail. As shown in FIG. 7, one end of a pipe 52a, 52b, 52c is connected to each of the suction holes 45a, 45b, 45c, and the other end of the pipe 52a, 52b, 52c is connected to a filter 53.
a, 53b, 53c, the solenoid valve 54 (54a, 54
b, 54c). And each solenoid valve 54
(54a, 54b, 54c) are check valves 55a, 55b,
It is connected to a reservoir tank 56 through 55. In addition, the vacuum pressure detector 5 is connected to each of the pipes 52a, 52b, and 52c.
7a, 57b, 57c and pressure gauges 58a, 58b, 58c
Is installed. On the other hand, the negative pressure generator 51 is composed of a vacuum pump 59 and its pump motor 60,
Pipes are connected to the reservoir tank 56 via the filters 1 and 62 and the filter 63. The reservoir tank 56 is also provided with a vacuum pressure detector 64 and a pressure gauge 65.

Therefore, when the vacuum pump 59 is driven by the pump motor 60, the interior of the reservoir tank 56 is maintained at a predetermined vacuum pressure, and the guide valve 35 is kept in close contact with the segment S1 while the solenoid valves 54a, 54b , 5
4c, the vacuum pressure in the reservoir tank 56 passes through the respective pipes 52a, 52b, 52c, and the suction holes 45a, 45c.
b, 45c via the pad plate 43 and the vacuum pad 4
A negative pressure is generated by acting on the room sealed by the segments 4a, 44b, 44c and the segment S1, and the guide frame 35 can hold the segment S1 by suction.

As shown in FIGS. 3 and 4, a mounting base 46 is fixed in the center of the slide box 33 and the guide frame 35 so as to penetrate in the vertical direction. The body of the safety jack 48 is made movable by the cylinder 47. The tip of the drive rod of the safety jack 48 is connected to the upper part of the mounting base 46, while the safety pin 49 is fixed to the lower end of the safety jack 48. And
A pair of position detectors 66a and 66b are mounted on the mount 46 to detect the telescopic position of the safety jack 48, that is, whether the safety pin 49 is fitted into the grout hole S1a of the segment S1.

Accordingly, when the drive rod of the safety jack 48 is extended while the guide frame 35 is in close contact with the segment S1, the safety pin 49 projects downward through the pad plate 43, and the grout formed on the segment S1 is formed. It can fit into the hole S1a. Here, the position detectors 66a and 66b are connected to the grout hole S1.
The insertion of the safety pin 49 into a can be detected.

The negative pressure generator 51, the solenoid valves 54 (54a, 54b, 54c), the position detectors 66a,
66b is connected to a control device 67, and a grip device 26 provided as a power source on the support block 21.
Power units 50 such as a and 26b are connected. The control device 67 includes a position detector 66a, 66b, a vacuum pressure detector 57a, 57b, 57c, a pressure gauge 58a,
The solenoid valve 54 based on the detection results of 58b, 58c, etc.
(54a, 54b, 54c) are opened and closed to set the negative pressure of the negative pressure generator 51 (reservoir tank 56) to act on the vacuum pads 44a, 44b, 44c.

The first grip device 26a has been described above, but as described above, the second grip device 26a
b also has a substantially similar structure, but as shown in FIGS. 1 and 2, the holding segment S2 is narrower than S1, and the size of the guide frame and the mounting position of the vacuum pad are adjusted accordingly. Are different.

Here, the operation of the shield excavator of the present embodiment and the segment erector device 10 mounted on the shield excavator will be described.

When excavating and forming a tunnel, as shown in FIGS. 1 and 2, a plurality of shield jacks 13 are extended and the skin plate 11 is advanced by a reaction force against the existing segment S, while a cutter (not shown) is used. The head is rotated to excavate the ground in front with multiple cutter bits. Next, one of the shield jacks 13 is operated in the contracting direction to form a space between the existing segment S and the new segments S1 and S2 are mounted in the space by the segment elector device 10. Go.

That is, each of the segments S1 and S2 is carried into an existing tunnel by a bogie (not shown), and a worker operates the segment erector device 10 to perform work. First, the hydraulic motor 19 is driven to turn the turning ring 16, and the first grip device 26a or the second grip device 26b is moved in the circumferential direction along the inner peripheral surface of the existing tunnel, while the lifting jack 25a or 25b is moved. The first grip device 26a or the second grip device 26b is moved in the radial direction of the existing tunnel by expansion and contraction, and is positioned close to the segments S1 and S2.

When the segment S1 is assembled by the first grip device 26a, the lifting jack 25a
And presses the respective vacuum pads 44a, 44b and 44c of the pad plate 43 mounted on the outer surface of the guide frame 35 against the inner peripheral surface of the segment S1, as shown in FIGS. At this time, the rolling of the guide frame 35 is adjusted by expanding and contracting the rolling jack 41, and the pitching of the guide frame 35 is adjusted by expanding and contracting the pitching jack 42. In this state, first, the safety jack 48 is extended, the main body of the safety jack 48 descends along the guide cylinder 47, and the safety pin 49 is projected downward to fit into the grout hole S1a of the segment S1. As a result, this segment S 1
1 can be prevented from slipping or falling off. At this time,
The position detectors 66a and 66b detect the insertion of the safety pin 49 into the grout hole S1a, and output the detection result to the control device 67.

When the control device 67 confirms that the safety pin 49 has been inserted into the grout hole S1a, the control device 67 then opens the solenoid valves 54a, 54b, 54c and sets the reservoir tank 5
6 through each of the pipes 52a, 52b, and 52c, and through the suction holes 45a, 45b, and 45c, the pad plate 43, the vacuum pads 44a, 44b, and 44c, and the segment S.
1 is applied to a closed room to create a negative pressure. Thus, the guide frame 35 sucks and holds the segment S1.

As described above, when the segment S1 is held by the guide frame 35 of the first grip device 26a, the lifting jack 25a is contracted to lift the segment S1. Then, the hydraulic motor 19 and the lifting jack 25a are driven again, the first grip device 26a is moved in the circumferential direction and the radial direction of the existing tunnel, and the held segment S1 is moved to a predetermined assembling position on the inner wall surface of the tunnel. .
Here, the segment S1 is fastened and fixed to the adjacent segment S by a fixing bolt (not shown) or the like. And
When each of the solenoid valves 54a, 54b, 54c is opened and closed to open the room enclosed by the pad plate 43, the vacuum pads 44a, 44b, 44c and the segment S1 to the atmosphere, the guide frame 35 releases the suction holding of the segment S1. Further, the safety jack 48 is contracted to pull out the safety pin 49 from the grout hole S1a of the segment S1.

When the holding of the segment S1 by the guide frame 35 is released in this manner, the hydraulic motor 19
And the first grip device 2 by driving the lifting jack 25a
6a is moved back to the original position. The tunnel is built by repeating this. The second grip device 26b
Is the same operation.

By the way, for some reason, for example,
When the vacuum pad 44c is damaged, the value detected by the pressure gauge 58c decreases, and the control device 67 receives this output and confirms an abnormality of the vacuum pad 44c. Accordingly, the control device 67 closes the solenoid valve 54c and controls the negative pressure detector 51 so that the remaining vacuum pads 44a and 44b can hold the segment S1 by suction.

[0043]

As described above in detail with the embodiments, according to the segment elector device of the present invention, the guide frame mounted on the grip device is provided with the safety pin fitted into the holding hole of the segment and the segment. A position detector is provided to detect the insertion and removal of this safety pin from the holding hole, and a vacuum pad capable of holding the segment by suction is attached to the outer surface of the guide frame, and a negative pressure generator is connected to this vacuum pad. Since the control device sets the negative pressure of the negative pressure generator based on the detection result of the position detector, it is possible to reliably detect the insertion of the safety pin into the holding hole of the segment and to prevent damage to the vacuum pad. Immediate detection allows the gripping device to hold the segment securely, resulting in a segment It is possible to improve the workability of the work, it is possible to improve the safety of the work.

Further, according to the segment elector apparatus of the present invention, the vacuum pad is divided into a plurality of parts, each vacuum pad and the negative pressure generator are individually connected to the pipe, and each pipe is connected via the solenoid valve and the pressure detector. The control device sets the negative pressure of the negative pressure generator based on the detection results of the position detector and the pressure detector and opens and closes the solenoid valve, so if the vacuum pad is damaged, the pressure detector The control unit confirms that the vacuum pad has been damaged, closes the corresponding solenoid valve, and resets the negative pressure of the remaining vacuum pad to ensure that the remaining vacuum pad holds the segment. can do.

Further, according to the segment elector device of the present invention, a plurality of grip devices are provided on the support, and each of the plurality of grip devices can control the attitude of each guide frame which is set in accordance with a segment having a different shape. In addition, a vacuum pad capable of movably supporting the existing tunnel along the front-rear direction and attaching and holding the segments on the outer surface of each guide frame is attached, so that a guide frame suitable for segments having different shapes is brought close to each other. Thus, the segments can be reliably held by suction by the vacuum pad.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a state in which a segment erector device according to an embodiment of the present invention is mounted on a shield excavator.

FIG. 2 is a front view of the segment erector device.

FIG. 3 is a sectional view of a main part of the grip device.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a layout view of a vacuum pad mounted on a guide frame.

FIG. 7 is a schematic diagram of a negative pressure pipe to a vacuum pad.

FIG. 8 is a schematic view of a conventional general shield excavator.

[Explanation of symbols]

 Reference Signs List 10 segment elector device 11 skin plate 16 revolving ring 19 hydraulic motor 22 support cylinder 22 (support) 25a, 25b lifting jack 26a first grip device 26b second grip device 35 guide frame 44a, 44b, 44c Vacuum pad 45a, 45b, 45c Suction hole 48 Safety jack 49 Safety pin 50 Power unit 51 Negative pressure generator 52a, 52b, 52c Piping 54, 54a, 54b, 54c Solenoid valve 56 Reservoir tank 57a, 57b, 57c Vacuum pressure detector 58a, 58b, 58c Pressure gauge 59 Vacuum pump 66a, 66b Position detector S1, S2 Segment S1a Grout hole (holding hole)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuki Kaneko 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Taisei Construction Co., Ltd. No. 1 Taisei Construction Co., Ltd. (72) Kenichi Kaneko, Inventor 1-25-1, Nishi Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. Taisei Corporation

Claims (3)

[Claims] 1. A swivel ring is provided at a rear portion of a tunnel excavator so as to be swivelable along a circumferential direction of a tunnel excavated,
A grip device movable along the radial direction of the existing tunnel is attached to the swivel ring via a support extending in the rear part in the excavation direction, and the grip device holds a segment carried into the existing tunnel. And a guide frame mounted on the grip device and shaped according to the shape of the segment, and movably provided on the guide frame and fitted into a holding hole of the segment. A safety pin that assists in holding the segment, a position detector that detects whether the safety pin is fitted into and removed from the holding hole of the segment, and is attached to an outer surface of the guide frame to be able to suck and hold the segment. A vacuum pad, a negative pressure generator connected to the vacuum pad, and detection of the position detector. Segment erector apparatus being characterized in that comprises a control device for setting the negative pressure of the negative pressure generator on the basis of the results. 2. The segment elector apparatus according to claim 1, wherein said vacuum pad is divided into a plurality of parts, each of said vacuum pads and said negative pressure generator are individually connected with a pipe, and an electromagnetic valve and pressure are connected to each of said pipes. A detector is provided, and the control device sets the negative pressure of the negative pressure generator based on the detection results of the position detector and the pressure detector, and performs an opening / closing operation of the electromagnetic valve. Segment elector device. 3. The segment elector device according to claim 1, wherein the support is provided with a plurality of grip devices, and each of the plurality of grip devices is configured to have a different shape according to a segment having a different shape. Wherein the position of the guide tunnel is controllable and movably supported along the front-rear direction of the existing tunnel, and a vacuum pad capable of holding the segment by suction is mounted on an outer surface of each guide frame. .