JP2010106593A - Erector device used for method of boring circumferentially enlarged tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an erector device which enables the supply and assembling of segments even in a restricted space and optimum for a method of boring a circumferentially enlarged tunnel. <P>SOLUTION: This erector device 30 used for a method of boring a circumferentially enlarged tunnel comprises a circumferential tunnel boring machine 1 having a vehicle 32 towed by a towing winch 25 and an erector 33 installed in the front part of the vehicle. The vehicle comprises wheels 35 allowed to roll by the towing winch on a longitudinal rail 34 laid down on existing segments S and wheels 37 allowed to roll by towing winches 38a, 38b installed on the existing segments on a lateral rail 36 laid down on the existing segments. The erector can perform at least a swiveling operation and multi-stage linear operations while gripping various types of segment pieces Sa, Sb, Sc. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an erector apparatus used in a circumferential enlargement tunnel excavation method for enlarging a part of an existing tunnel in a ring shape.

  When constructing a branching / merging part of a road tunnel, an emergency parking zone, etc., it is necessary to partially widen the cross section of the existing tunnel (for example, φ 12 m → φ 18 m). As this widening method, there is a circumferential expansion tunnel excavation method in which a circumferential tunnel excavator is propelled around the existing tunnel in a planned expansion area of a normal diameter existing tunnel, and a part of the existing tunnel is expanded in an annular shape. This is disclosed in Patent Document 1 and the like.

Japanese Examined Patent Publication No. 62-17072

  By the way, in the circumferential enlargement tunnel excavation method, due to its structure, a circumferential enlargement tunnel portion having a rectangular cross section of about 3 m in length and about 11 m in width is excavated by a rectangular circumferential tunnel excavator.

  And even when excavating a tunnel in such a narrow space, in the situation of natural ground, it is necessary to dig up the face and assemble the segment, which is optimal for the circumferential expansion tunnel excavation method. Currently, there is a demand for the development of Yamadome equipment and Electa equipment.

  The present invention has been proposed in view of such circumstances, and it is an object of the present invention to provide an erector apparatus that is optimal for a circumferentially enlarged tunnel excavation method by enabling segment supply and assembly even in a narrow space.

In order to achieve such an object, the erector apparatus used in the circumferential enlargement tunnel excavation method according to the present invention,
An erector apparatus used in a circumferentially expanded tunnel excavation method in which a circumferential tunnel excavator is propelled in the circumferential direction of the existing tunnel in a planned expansion area of a normal diameter existing tunnel and a part of the existing tunnel is expanded in a ring shape. There,
The erector apparatus includes a carriage to be pulled by the first traction means to the circumferential tunnel excavator, and an erector assembled to the front portion of the carriage,
The carriage has a wheel that can roll on the front-rear rail laid on the existing segment by the first traction means, and a second rail provided on the left-right rail laid on the existing segment in the existing segment. Equipped with wheels that can roll by means of traction,
The erector is characterized by gripping various segment pieces and enabling at least a turning motion and a multistage linear motion.

Also,
The cart is pulled by the first pulling means via a foldable portal hanger.

Also,
The wheel capable of rolling on the front-rear direction rail and the wheel capable of rolling on the left-right direction rail are selectively extendable.

Also,
The erector includes a board that can move in the left-right direction on the front surface of the carriage, a turning table that can turn on the board and can be fixed at turning positions of 90 ° and 180 °, and a first that can slide on the turning table. A movable plate; a second movable plate that can slide on the first movable plate in the same direction as the first movable plate; and a support plate attached at a right angle; and the first movable plate and the second movable plate on the support plate. A gripping plate that is slidable in a direction perpendicular to the moving direction of the movable plate, and various segment pieces are gripped by the gripping plate via a gripping mechanism.

  According to the erector apparatus used in the circumferential enlargement tunnel excavation method according to the present invention, when the circumferential tunnel excavator moves from the start and arrival position to the excavation position, the erector operates in various directions. As a result, it is pulled by the first pulling means in a compact state, and therefore, even in an existing segment having a rectangular cross section that is a narrow space, various segment pieces are smoothly carried into the excavation position by being guided by the longitudinal rail. be able to. After this loading, even when returning to the excavation position in the air to carry various segment pieces to be assembled next, if the erector moves in the above-mentioned compact state, it moves smoothly even within the existing segment of the rectangular section which is a narrow space. be able to.

  On the other hand, in the excavation position, various segment pieces can be quickly and easily moved in the circumferentially enlarged tunnel portion, which is a narrow space, by the turning motion and multi-step linear motion in the erector in addition to the lateral movement along the lateral rail of the carriage. Smooth and even assembled with high accuracy.

  Hereinafter, the erector apparatus used for the circumference expansion tunnel excavation method concerning the present invention is explained in detail using an example using a drawing.

  FIG. 1 is a side sectional view of a circumferential tunnel excavator equipped with a mountain retaining device used in a circumferential enlargement tunnel excavation method showing an embodiment of the present invention, and FIG. 2 is a plan sectional view of the circumferential tunnel excavator. 3 is an explanatory diagram of a digging range and a process in each excavating machine, FIG. 4 is a view taken along an arrow A in FIG. 1, FIG. 5 is a cross-sectional view taken along the line BB in FIG. FIG. 7 is a conceptual diagram of the circumferential enlargement tunnel excavation method, FIG. 8 is a side view at the assembly position of the elector device used for the circumferential enlargement tunnel excavation method, and FIG. 9 is an explanatory view of the 180 ° turning operation of the elector, FIG. 10 is a side view of the erector device at the start position, FIG. 11 is an explanatory diagram of the movement of the cart in the left-right direction, FIG. 12 is a plan view showing the positional relationship between the circumferential tunnel excavator and the erector device, and FIG. Explanatory drawing of the movement in the front-rear direction and the movement in the left-right direction, FIG. 14 is the second and third in the elector FIG. 13B is a sectional view taken along the line D-D in FIG. 13B showing the operation of the jack, FIG. 15 is an explanatory diagram of the operation of the first jack in the erector, FIG. 16 is an explanatory diagram of the turning operation of the erector, and FIG. FIG. 18 is a diagram illustrating the operation of the third jack in the erector, FIG. 19 is a diagram illustrating the operation of the fourth jack and the first grip in the erector, and FIG. 20 is a diagram illustrating the fourth jack and the first and second grips in the erector. FIG. 21 is an explanatory view of an attachment in the erector.

  As shown in FIG. 7, this circumferential expansion tunnel excavation method is configured to expand a circumferential tunnel excavator 1, which will be described later, in the circumferential direction of the existing tunnel T in a planned expansion area of the existing tunnel T having a normal diameter (approximately 12 m). A part of the existing tunnel T (tunnel length of about 11 m) is expanded in a ring shape (φ about 12 m → φ about 18 m).

  As shown in FIGS. 1 to 6, the circumferential tunnel excavator 1 has a rectangular tubular excavator body 2 that is long in the left-right direction, and is divided into a front trunk 2a, an intermediate trunk 2b, and a rear trunk 2c. Assembly in an 8 (= L) × 13 m pit P (starting and reaching position of the circumferential tunnel excavator) in the planned expansion area of the existing tunnel T is facilitated (see FIG. 7). In this assembled state, an arcuate outer shape is exhibited in a side view along the outer peripheral surface of the existing tunnel T.

  In the excavator body 2, four excavating machines 4 are juxtaposed in the left-right direction via square-shaped beam-like members 3 laid horizontally in the left-right direction, and excavated by these four excavating machines 4. The excavated earth and sand is led to a shooter 5 that is located behind the excavating machine 4 and arranged in parallel in the left-right direction, and from the gate 6 that is opened when necessary through the hose (not shown) to the outside through the existing tunnel T. It is supposed to be discharged. In FIG. 1 and FIG. 2, reference numeral 7 denotes an inspection port for inspecting sediment accumulation.

The excavating machine 4 has a bucket 9 attached to the tip of a boom 8. The boom 8 is extended and contracted by a hydraulic jack 10, the boom 8 is lifted and lowered by a hydraulic jack 11, and a hydraulic jack (not shown) (see operation locus T _{1 in} FIG. 2). ) is composed of excavating acquisition combination machine capable elevation of the bucket 9 by the hydraulic jack (not shown) and left and right turning of the boom 8 (see operation path T ₂ of the FIG. 1) by.

  In addition, partition walls 12 are provided between the excavating machines 4, and two face jacks 13 are embedded on the front end surfaces of these partition walls 12. A plate or the like (not shown) is attached to the front end surface of these face jacks 13 as necessary so that the face of the face can be pressed.

  FIG. 3 shows the excavation range and process in each excavating machine 4 and excavates the face of the natural ground in three stages in the vertical direction by the required operation of the boom 8 and the bucket 9 described above. Yes.

  In addition, flange-shaped reinforcing plates 14 and 15 are provided on the inner peripheral surface of the excavator main body 2 in two stages in the front-rear direction, and the existing segments are formed so as to penetrate these reinforcing plates 14 and 15. A shield jack 16 for propelling the excavator body 2 by applying a reaction force to S is supported. As shown in FIGS. 5 and 6, the reinforcing plates 14 and 15, which are divided into a plurality of parts (10 parts in the illustrated example) in the circumferential direction together with the excavator body 2 (intermediate trunk 2 b), are joined together by welding or the like. It becomes.

  As shown in FIGS. 5 and 6, for example, 22 shield jacks 16 are arranged on the upper half side of the excavator main body 2 at a predetermined interval in the circumferential direction, while on the lower half side. Are arranged at a predetermined interval in the circumferential direction, for example, as few as eight, and when the excavator body 2 is propelled, the propulsive force is appropriately distributed and can be smoothly propelled along the outer peripheral surface of the existing tunnel T having a circular cross section. It is like that.

  And the mountain retaining device 17 is assembled | attached to the front inner peripheral part of the said excavator main body 2. As shown in FIG. The mountain retaining device 17 includes a support plate 18 slidably attached to the front inner peripheral surface of the excavator body 2 (front barrel 2a) via a pair of left and right rails 19 to advance and excavate the excavator body forward. It is possible to move back into the machine body, and the base end portion of the square mountain retaining plate 20 is pivotally supported on the front end portion of the support plate 18 by a pair of left and right hinges 21. While the front end side of the plate 20 stands inward of the excavator body 2, it can be flattened along the inner peripheral surface of the excavator body 2 when retreating.

  More specifically, the support plate 18 is divided into a plurality of pieces (18 in the illustrated example) in the circumferential direction of the excavator main body 2 and is disposed almost entirely around the excavator body 2. One or two mountain retaining plates 20 that are divided into a plurality of pieces (32 in the example shown in the figure) and arranged substantially entirely are pivotally supported in the circumferential direction of the machine body 2 (see FIG. 4).

  Further, a mountain slide jack 22 for moving the support plate 18 forward and backward is interposed between the inner surface of the support plate 18 and the inner peripheral surface of the excavator body 2, and supports the inner surface (back surface) of the mountain plate 20. One mountain retaining plate jack 23 for raising and lowering the mountain retaining plate 20 is interposed between the inner surfaces of the plates 18 (see FIG. 4).

  The mountain retaining slide jack 22 and the mountain retaining plate jack 23 are disposed on the outer periphery of a tapered cylindrical guide wall 24 defined inside the excavator body 2 so as to surround the excavating machine 4 described above. In the flat state of the mountain retaining plate 20, its tip is connected to the opening edge of the guide wall 24, and the earth and sand excavated by the excavating machine 4 is guided by the mountain retaining plate 20 and the guide wall 24, and the guide wall 24. It is guided to the above-mentioned shooter 5 connected to.

  Since the circumferential tunnel excavator 1 is configured as described above, the support plate 18 of the mountain retaining device 17 is retracted into the excavator main body by contraction of the mountain retaining slide jack 22 when the face is excavated by the excavating machine 4. At the same time, the mountain retaining plate 20 is flattened along the inner peripheral surface of the excavator body 2 by contraction of the mountain retaining plate jack 23.

Thereby, since the mountain retaining plate 20 is compactly stored in the excavator body, the excavating machine 4 can ensure a wide excavation operation range without interfering with the mountain retaining plate 20 even in a narrow space. In particular, it is possible to secure a wide operating range of the hydraulic jack (the reference trajectory T ₁ of the Figure 2) by lateral pivoting of the boom 8, not shown and elevation of the boom 8 by the hydraulic jack 11 (see FIG. 1) (see FIG. 2) .

  On the other hand, when the excavator body 2 is propelled by extending the shield jack 16 and applying a reaction force to the existing segment S, the mountain is cut when it is determined that it is necessary to cut the face depending on the condition of the natural ground. The distillation device 17 is activated.

  Then, when operating the mountain retaining device 17, first, the boom 8 of the excavating machine 4 is contracted by the hydraulic jack 10. Next, the support plate 18 of the mountain retaining device 17 is advanced to the front of the excavator main body by extending the mountain retaining jack 22, and the mountain retaining plate 20 is moved inward of the excavator main body 2 by extending the mountain retaining plate jack 23. Stand up (see the chain line state of the mountain retaining plate 20 shown in FIGS. 2 and 4).

  Thereby, in cooperation with the extended face jack 13, the face is piled up by the mountain retaining plate 20, and the excavator body 2 is smoothly pushed by the shield jack 16 by extension. When the excavator body 2 of the circumferential tunnel excavator 1 is excavated in a horizontal and upward state, the excavated earth and sand are taken into the shooter 5 by gravity or the like, and the gate 6 is opened when necessary. Although it is discharged to the outside via the existing tunnel T by a hose, etc., when excavating in a downward state, the excavated earth and sand are sucked by connecting a vacuum hose etc. to the gate 6 up to a predetermined location. It is necessary to discharge.

  As shown in FIG. 8, the circumferential tunnel excavator 1 is pulled by the tractor winch (first traction means) 25 provided at the rear portion of the excavator main body 2. In the figure, 26 is a pulling wire and 27 is a pulling reaction force wire.

  The erector device 30 includes a gate-shaped foldable hanger 31 to which the unwinding end portion of the pulling wire 26 is anchored, and a frame-like cart 32 in which the left and right base ends of the hanger 31 are pivotally supported. The erector 33 assembled on the front surface of the carriage 32 is a main member.

  As shown in FIG. 11, the carriage 32 has a total of eight expansion / contraction pairs (a pair of front and rear) on a pair of left and right front-rear rails 34 laid on the outer peripheral side inner surface and the inner peripheral side inner surface of the existing segment S. It can be moved in the front-rear direction by wheels 35 that can be advanced and retracted, and the pair of front-rear left-right rails 36 laid on the outer peripheral side inner surface and the inner peripheral side inner surface of the existing segment S at the segment assembly position It can move in the left-right direction by a set of a total of 16 extendable / retractable (retractable) wheels 37. In FIG. 11, reference numerals 38a and 38b denote traction winches (second traction means) in the left-right direction, and 39 denotes a traction wire.

  Further, as shown in FIGS. 12 and 13, the carriage 32 is movable through the front-rear rail 34 so that the central portion of the existing segment S does not interfere with the shape holding device 40, and At the assembly position, transfer to the left-right rail 36 and carry the long general segment piece Sa etc. gripped by the erector 33 to a predetermined position in the left-right direction to perform various operations of the erector 33 described later (180 ° turning operation shown in FIG. It can be assembled in a two-step linear movement operation shown in FIG. It should be noted that it is preferable that power units of various hydraulic devices are mounted inside the carriage 32.

  As shown in FIG. 10, the long general segment pieces Sa and the like are previously provided on a cradle 41 provided in a pit P (starting and reaching position of a circumferential tunnel excavator) of an existing tunnel T. It is carried in and placed from the tunnel T by a crane or the like. Only the erector device 30 is retreated (returned) from the excavation position into the pit P (starting and reaching position of the circumferential tunnel excavator) and gripped by various operations of the erector 33 to be described later, and then the erector device again. 30 is moved to the excavation position.

  As shown in FIG. 15, the erector 33 is supported by a pair of left and right first jacks 44, which are back-coupled to each other via a linear guide 42 on the front surface of the carriage 32 so as to be slidable in the left-right direction. The Two pairs of left and right first jacks 44 are disposed at a predetermined interval.

  As shown in FIG. 16, a turning table 46 is supported on the substrate 43 so as to be manually turnable through a bearing 45, and at a turning position of 90 ° and a turning position of 180 ° using a pin 47. It can be fixed.

  As shown in FIG. 17, a first movable plate 49 is slidably supported on the turning table 46 by a pair of second jacks 50 via a linear guide 48, and the first movable plate 49. On the upper side, the second movable plate 52 is supported by a pair of third jacks 53 via a linear guide 51 so as to be slidable in the same direction as the first movable plate 49.

  FIG. 17 is a diagram in which the second jack 50 and the third jack 53 are both extended to move the second movable plate 52 (general segment piece Sa and the like) to the maximum extension position with respect to the turning table 46 (FIG. 14 ( c)), FIG. 18 shows that the third jack 53 is extended while the second jack 50 is contracted, and the second movable plate 52 (general segment piece Sa, etc.) is intermediate to the turning table 46. In the drawing moved to the extended position (see FIG. 14B), the second jack 50 and the third jack 53 are contracted together so that the second movable plate 52 (general segment piece Sa) is moved with respect to the turntable 46. FIG. 14 (a) shows a state where the film is not stretched.

  As shown in FIG. 19, a support plate 54 is fixed to the second movable plate 52 at a right angle, and a grip plate 56 is provided on the support plate 54 via a linear guide 55, and a pair of fourth jacks 57. Thus, the first movable plate 49 and the second movable plate 52 are supported so as to be slidable in a direction perpendicular to the moving direction.

  On the grip plate 56, a first screw mechanism 58 of a manual screw type capable of gripping an L-shaped corner segment piece Sb alone, and a long general segment piece Sa as shown in FIG. A second grip mechanism 59 that can be gripped in cooperation with the first grip 58 and can be adjusted by a manual screw type is disposed.

  Furthermore, as shown in FIG. 21, an attachment 61 having a manual screw type third grip mechanism 60 capable of gripping the key segment piece Sc and the like can be mounted on the grip plate 56 as required. Is preferable.

  Since the erector device 30 is configured as described above, when moving from the pit P of the existing tunnel T (starting and reaching position of the circumferential tunnel excavator) to the excavation position, the erector 33 is configured as shown in FIG. As shown in a), the second jack 50 and the third jack 53 are contracted together so that the second movable plate 52 (general segment piece Sa etc.) is not stretched with respect to the turning table 46 in a compact state. It is towed by the tow winch 25 through the carriage 32 while gripping Sa, Sb, Sc.

  Thereby, even in the existing segment S of the rectangular cross section which is a narrow space, the various segment pieces Sa, Sb, Sc can be smoothly carried into the excavation position. Even after returning to the excavation position in order to carry in various segment pieces Sa, Sb, Sc to be assembled next, the erector 33 may move in the above-described compact state.

  At the excavation position, the segment pieces Sa, Sb, and Sc are moved to the left or right side (see FIG. 21) and the outer peripheral side or inner peripheral side (see FIG. 21) by the 90 ° and 180 ° turning operations of the turning table 46 in the erector 33. (See FIG. 9). In FIG. 21, the attachment 61 is mounted on the grip plate 56 of the erector 33, but this may not be necessary.

  And in the predetermined assembly position of various segment piece Sa, Sb, Sc, the horizontal movement (refer FIG. 11) of the trolley | bogie 32, the slide operation | movement to the left-right direction of the board | substrate 43 (refer FIG. 15), the 1st movable plate 49, A two-stage linear movement operation by the second movable plate 52 (see FIGS. 17 and 18) and a sliding operation in the direction perpendicular to the movement direction of the first movable plate 49 and the second movable plate 52 of the grip plate 56 (FIG. 19). As a result, the various segment pieces Sa, Sb, Sc can be assembled quickly and smoothly with high accuracy even in the circumferentially enlarged tunnel portion which is a narrow space.

  In this way, after excavating the circumferential enlarged tunnel portion, if the inner peripheral side of the existing segment S is disassembled together with the existing segment in the planned expansion area of the existing tunnel T, a part of the existing tunnel T is enlarged in a ring shape.

  Needless to say, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention. For example, although the example which used the excavation taking-in combined machine with which the bucket 9 was attached to the front-end | tip of the boom 8 was shown for the excavation machine 4 of the circumferential tunnel excavator 1, it is not restricted to this, Even if it uses an excavation exclusive machine etc. Good. Moreover, although the example which pulls the erector apparatus 30 and the erector 33 with the traction winches 25, 38a, and 38b was shown, not only this but another traction means may be used.

FIG. 1 is a side sectional view of a circumferential tunnel excavator equipped with a mountain retaining device used in a circumferential enlargement tunnel excavation method showing an embodiment of the present invention. It is a plane sectional view of a circumference tunnel excavator. It is explanatory drawing of the excavation range and process in each excavation machine. It is A arrow directional view of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional half-sectional view of FIG. It is a conceptual diagram of the circumference expansion tunnel excavation construction method. It is a side view in the assembly position of the erector apparatus used for the circumference expansion tunnel excavation method. It is explanatory drawing of 180 degree rotation operation | movement of an erector. It is a side view in the starting position of an erector device. It is explanatory drawing of the left-right direction movement of a trolley | bogie. It is a top view which shows the positional relationship of a circumferential tunnel excavator and an erector apparatus. It is explanatory drawing of the front-back direction movement and left-right direction movement of a trolley | bogie. It is the DD sectional view taken on the line of FIG.13 (b) which shows operation | movement of the 2nd and 3rd jack in an erector. It is operation | movement explanatory drawing of the 1st jack in an erector. It is explanatory drawing of turning operation | movement of an erector. It is operation | movement explanatory drawing of the 2nd jack in an erector. It is operation | movement explanatory drawing of the 3rd jack in an erector. It is operation | movement explanatory drawing of the 4th jack and 1st grip in an erector. It is operation | movement explanatory drawing of the 4th jack and 1st and 2nd grip in an erector. It is explanatory drawing of the attachment in an erector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circumferential tunnel excavator 2 Excavator main body 3 Beam-shaped member 4 Excavation machine 5 Shuter 6 Gate 7 Inspection port 8 Boom 9 Bucket 10 Hydraulic jack 11 Hydraulic jack 12 Partition wall 13 Face jack 14 Reinforcement plate 15 Reinforcement plate 16 Shield jack 17 Mountain retaining device 18 Support plate 19 Rail 20 Mountain retaining plate 21 Hinge 22 Mountain retaining slide jack 23 Mountain retaining plate jack 24 Guide wall 25 Towing winch 26 Towing wire 27 Towing wire 30 Elector device 31 Hanger 32 Carriage 33 Elector 34 Longitudinal rail 35 Wheel 36 Left-right rail 37 Wheel 38a, 38b Towing winch 39 Towing wire 40 Shape holding device 41 Receiving base 42 Linear guide 43 Substrate 44 First jack 45 Bearing 46 Turning table 47 Pin 48 Linear guide 9 first movable plate 50 second jack 51 linear guide 52 second movable plate 53 third jack 54 support plate 55 linear guide 56 gripping plate 57 fourth jack 58 first grip mechanism 59 second grip mechanism 60 third grip mechanism 61 Attachment T Existing tunnel P Pit T ₁ Hydraulic jack motion trajectory T ₂ Hydraulic jack motion trajectory S Existing segment Sa (long) general segment piece Sb Corner segment piece Sc Key segment piece

Claims (4)

An erector device used in a circumferentially expanded tunnel excavation method in which a circumferential tunnel excavator is propelled in the circumferential direction of the existing tunnel in a planned expansion area of a normal diameter existing tunnel and a part of the existing tunnel is expanded in a ring shape. There,
The erector apparatus includes a carriage to be pulled by the first traction means to the circumferential tunnel excavator, and an erector assembled to the front portion of the carriage,
The carriage has a wheel that can roll on the front-rear rail laid on the existing segment by the first traction means, and a second rail provided on the left-right rail laid on the existing segment in the existing segment. Equipped with wheels that can roll by means of traction,
The erector is an erector apparatus for use in a circumferential enlargement tunnel excavation method characterized by gripping various segment pieces and enabling at least a turning motion and a multistage linear motion.   2. The erector apparatus used in the circumferential enlargement tunnel excavation method according to claim 1, wherein the carriage is pulled by the first pulling means through a foldable gate-shaped hanger.   The circumference according to claim 1 or 2, wherein the wheel that can roll on the front-rear rail and the wheel that can roll on the left-right rail are selectively extendable. Electa device used for the enlarged tunnel excavation method.   The erector includes a board that can move in the left-right direction on the front surface of the carriage, a turning table that can turn on the board and can be fixed at turning positions of 90 ° and 180 °, and a first that can slide on the turning table. A movable plate; a second movable plate that is slidable in the same direction as the first movable plate on the first movable plate and provided with a support plate at a right angle; and the first movable plate and the second movable plate on the support plate. A gripping plate that is slidable in a direction perpendicular to the moving direction of the movable plate, and various segment pieces are gripped by the gripping plate via a gripping mechanism. Electa device used for the circumferential enlargement tunnel excavation method.

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