JP5485918B2 - Non-uniformly divided segment assembling apparatus and assembling method - Google Patents

Description

  The present invention relates to an assembling apparatus and an assembling method for non-uniformly divided segments assembled in an annular shape along an inner peripheral wall of a tunnel excavated by a shield machine.

  The shield machine includes a cutter head, an erector device, a shield jack, and the like. The cutter head is provided in the front part of the shield excavator main body and is rotationally driven by a drive motor, thereby excavating the tunnel. The erector apparatus performs an operation of assembling the segments in a ring shape along the inner peripheral wall of the tunnel. A plurality of shield jacks are arranged in the circumferential direction of the shield excavator body, and the assembled segment is pressed backward to receive a pressing reaction force from the segment, thereby advancing the shield excavator body.

  The shield excavator described above is disclosed in, for example, Patent Document 1, and the segment assembling apparatus is disclosed in, for example, Patent Document 2.

Japanese Patent No. 3081328, “Automatic operation control method of earth pressure shield machine” JP 2001-193399 A, “Segment assembly positioning apparatus and method”

In the shield excavator described above, the annular segment is divided into a plurality of pieces (hereinafter referred to as “piece segments” or “P segments”) in the circumferential direction, one of which holds the circular shape of the tunnel. It has a wedge shape and is finally assembled by inserting the shaft, and is called a “key segment” (or “K segment”).
In the following description, a segment assembled in an annular shape is simply referred to as a “ring”.

Conventionally, in assembling a segment, the position of a key segment is set in advance from a request for tunnel construction and designated by an inter-ring joint number by an operator.
“Inter-ring joint number” refers to a joint (“between rings”) that connects an existing ring (hereinafter referred to as “front ring”) and a ring under assembly (hereinafter referred to as “current ring”) in the axial direction of the tunnel. The number of the joint ")". The ring-to-ring joint number is based on the premise that the ring-to-ring joints are conventionally arranged evenly in the circumferential direction. For example, N (= 1, 2) from the apex of the tunnel clockwise (clockwise) with respect to the face. , 3... N is an integer).

  On the other hand, in recent years, “unevenly divided segments” in which the shape of each segment is not uniform have been used. In the case of this non-uniformly divided segment, the circumferential position of the inter-ring joint in the ring assembled in an annular shape is non-uniform, and there is a problem that the position of the key segment cannot be specified by the inter-ring joint number.

Therefore, in the case of non-uniformly divided segments, conventionally, the inter-ring joint position of each ring is individually calculated and collated with an existing front ring to determine whether each segment can be assembled.
However, in the case of non-uniformly divided segments, since the required segment types are diverse, the assembly pattern is enormous and complex, and human error is likely to occur during individual calculations, which hinders segment assembly based on this. There was a risk of going out.

For example, the position of the joint between the rings of the front ring and the current ring needs to match, but when calculated individually, there is a possibility that a part of the position of the joint between the rings becomes inconsistent due to human error.
In addition, if the circumferential joint position of the front ring and the current ring overlaps (referred to as “braided”), the strength of the braided part will decrease, so this must be avoided. There was a risk that part of the circumferential joint position would match due to a mistake.

  The present invention has been made to solve such problems. That is, the object of the present invention is to automatically set the assembly angle of each segment by designating the position of the key segment by the inter-ring joint number, even if the segment is unevenly divided, and the front ring and the current ring. Assembling apparatus and assembly for non-uniformly divided segments that can accurately check the position of the joint between the rings connecting the ring, and can accurately check the presence or absence of the braiding where the circumferential joint positions of the front ring and the current ring overlap It is to provide a method.

According to the present invention, there is provided a method for assembling a non-uniformly divided segment that is annularly assembled along the inner peripheral wall of a tunnel,
The non-uniform division segment is composed of a plurality of piece segments divided in the circumferential direction, and the piece segment assembled last is a key segment,
(A) From the circumferential position of the inter-ring joint in the ring in which the piece segments are annularly assembled, the greatest common divisor of the circumferential interval of the inter-ring joint is calculated,
(B) setting a virtual inter-ring joint having the greatest common divisor as a circumferential pitch;
(C) A virtual ring joint number is set for each virtual ring joint,
(D) A method for assembling a non-uniformly divided segment is provided, wherein a piece segment is assembled by designating a circumferential position of the key segment by the joint number between virtual rings.

Moreover, according to the present invention, there is an apparatus for assembling an unevenly divided segment that is assembled in an annular shape along the inner peripheral wall of the tunnel,
The non-uniform division segment is composed of a plurality of piece segments divided in the circumferential direction, and the piece segment assembled last is a key segment,
A storage device for storing a circumferential position of an inter-ring joint in a ring in which the piece segments are annularly assembled;
Calculate the greatest common divisor of the circumferential spacing of the inter-ring joint,
Set the virtual inter-ring joint with the greatest common divisor as the circumferential pitch,
An arithmetic unit for setting a joint number between virtual rings for each joint between the virtual rings;
An input device for designating the circumferential position of the key segment by the joint number between the virtual rings;
There is provided an assembling apparatus for non-uniformly divided segments, comprising an erector apparatus for assembling piece segments.

According to the method and apparatus of the present invention described above, the virtual ring joint with the circumferential common pitch being the greatest common divisor of the circumferential interval of the ring joint is set by the arithmetic unit, and the virtual ring joint number is assigned to each virtual ring joint. Therefore, the circumferential direction position of the key segment can be designated by the virtual inter-ring joint number by the input device.
Therefore, even for non-uniformly divided segments, the assembly angle of each piece segment can be automatically set by designating the position of the key segment by a virtual inter-ring joint number regardless of the segment type.

  In addition, the circumferential position of the inter-ring joint in the current ring after assembly is calculated from the circumferential position of the key segment and the corresponding circumferential position of the inter-ring joint. By calculating the circumferential position of the common inter-ring joint, the position of the inter-ring joint that connects the front ring and the current ring can be accurately checked, regardless of the segment type, even for non-uniformly divided segments. it can.

Also, from the circumferential position of the key segment and the actual assembly angle of each piece segment, the circumferential joint position in the current ring after assembly is calculated, and the circumferential joint position common to the previous ring and the current ring assembled immediately before is calculated. By calculating, it is possible to accurately check the presence or absence of a braid in which the circumferential joint positions of the front ring and the current ring overlap even if they are non-uniformly divided segments regardless of the segment type.

It is a schematic sectional drawing which shows the shield excavator provided with the apparatus of this invention. It is a block diagram of the segment assembly apparatus by this invention. It is a front view which shows the example of a nonuniform division | segmentation segment. It is a figure which shows the assembly state of the segment which swirled the nonuniform division | segmentation segment of FIG. It is a 1st flowchart of the segment assembly method by this invention. It is a 2nd flowchart of the segment assembly method by this invention. It is a 3rd flowchart of the segment assembly method by this invention. It is a 4th flowchart of the segment assembly method by this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the common part in each figure, and the overlapping description is abbreviate | omitted.

FIG. 1 is a schematic sectional view showing a shield excavator provided with the apparatus of the present invention.
In this figure, a segment assembling apparatus 10 according to the present invention is installed to control an erector apparatus 7. The installation position of the segment assembly device 10 is shown behind the erector device 7 in this figure, but may be installed close to the erector device 7.

  The shield excavator 1 includes a shield excavator main body 2, a cutter head 3, and a shield jack 4. The main body 2 of the shield excavator is formed in a cylindrical shape. The cutter head 3 is rotatably attached to a frame 5 fixed to the main body 2 in front of the main body 2 (left side in the figure) and performs tunnel cutting. The cut earth and sand are discharged to the rear side by a screw conveyor (not shown) or the like. The shield jack 4 is attached to the frame 5. The shield jack 4 pushes the segment S composed of the plurality of piece segments P assembled to the rear side by the extension stroke, and moves the main body 2 to the front side by the reaction force. When the piece segment is assembled by the erector device 7, the shield jack 4 contracts so as not to interfere with the erector device 7 and the piece segment.

  The shield excavator 1 has a transport device 6. The transport device 6 includes a carriage 6a, a hoist type crane 6b, and a piece segment conveyor 6c. In the tunnel excavated by the shield excavator 1, the carriage 6a is placed in the tunnel axis direction (left and right direction in the figure) by placing the piece segment P from the rear side (right side in the figure) to the front side (left side in the figure). It travels, and thereby the piece segment P is conveyed to the front side of the tunnel. The crane 6b lifts the piece segment P on the carriage 6a that has traveled to the front side of the tunnel, moves horizontally to the front side of the tunnel, and suspends the piece segment P on the conveyor 6c. The conveyor 6c is composed of a roller conveyor, and moves the piece segment P suspended from the roller conveyor 6c by the crane 6b to the front side of the tunnel.

  The piece segments P are suspended from the roller conveyor 6c by the crane 6b in the order of the assembly order set in advance, and the assembly order of the piece segments P is positioned closer to the front side of the tunnel in the roller conveyor 6c. The erector apparatus 7 grips the piece segment P in order from the piece segment P located on the most front side of the tunnel in the roller conveyor 6c, and assembles the piece segment P to the assembly position. In this way, the piece segments P are assembled in the order of the preset assembly order.

The erector apparatus 7 assembles a plurality of piece segments P into an annular segment S. The erector device 7 includes a swivel ring 7a, a radial direction moving portion 7d, an axial direction moving portion 7b, and a gripping device 7c.
The swivel ring 7a is supported by the frame 5 so as to be swiveled around the center axis of the tunnel by a driving device (not shown). The radial movement part 7d can reciprocate in the radial direction with respect to the center of the tunnel. The axial direction moving part 7b is supported by the guide member 8 so as to be reciprocated by a driving device (not shown) along the guide member 8 fixed to the radial direction moving part 7d and extending in the horizontal direction. The gripping device 7c is attached to the axial movement unit 7b.

  With this configuration, the erector apparatus 7 operates as follows. The gripping device 7c grips the piece segment P on the conveyor 6c of the piece segment closest to the tunnel front side, and the front side of the tunnel where the cutter head 3 of the shield excavator 1 is located by the movement of the axial movement unit 7b (in the drawing) To the center of the tunnel by the movement of the radial movement part 7d, and then the swiveling ring 7a swivels around the central axis C to position the gripping device 7c in the swiveling direction, and then in the radial direction The moving part 7d moves outward to the assembly position with respect to the radial direction, and the axially moving part 7b moves toward the segment S assembled immediately before by the movement of the axial moving part 7b (for example, in the tunnel). Insert the bolt (not shown) of the piece segment P that is moved in the axial direction into the bolt hole (not shown) of the segment. It is possible. Thereby, the piece segment P can be completely assembled | attached to the above-mentioned assembly position.

FIG. 2 is a block diagram of a segment assembling apparatus according to the present invention.
As shown in this figure, the segment assembling apparatus 10 of the present invention includes a storage device 12, an input device 14, an arithmetic device 16, and an output device 18.

The storage device 12 is a storage device of a computer (for example, ROM, RAM, hard disk, memory card), and stores ring information and segment information of various unequal division segments S.
Details of the ring information and the segment information will be described later.

The input device 14 is, for example, a computer keyboard, and inputs ring information, segment information, and order determination conditions to the storage device 12.
Note that the input device 14 may be an input device other than a keyboard (for example, a card reader or another storage device).

The present invention is directed to the case where the segment S is an unevenly divided segment. “Non-uniformly divided segment” means a segment in which the shape of the piece segment P is not uniform.
The non-uniform divided segment S is composed of a plurality of piece segments P divided in the circumferential direction, and the piece segment P assembled last is the key segment K.
In addition, this invention is not limited to the non-uniform division | segmentation segment S, It can apply also to the equal division | segmentation segment where the shape of the piece segment P is uniform.

  The order determination condition includes, for example, the piece number of the first piece segment to be assembled (referred to as “first piece number”), the “assembly pattern” for determining the second piece segment to be assembled, and the “priority criterion” indicating the priority of the assembly sequence. "including.

  The computing device 16 is a computing device of a computer, and determines the actual assembly angle, assembly order, and turning direction of each piece segment P from the ring information, segment information, and order determination conditions described above.

  The output device 18 outputs the determined actual assembly angle, assembly order, and turning direction to the erector device 7. Note that this output may be output to an output device such as a CRT or a printer.

  The erector apparatus 7 assembles the piece segments P based on the determined actual assembly angle, assembly order, and turning approach direction.

FIG. 3 is a front view showing an example of the unequal division segment S. This figure corresponds to a view of the face side (left side) from the wellhead side (right side) in FIG.
In this figure, the key segment K is provisionally determined so as to be located at the top, but the circumferential position is arbitrary.

  The piece segments P are connected to each other in the axial direction of the tunnel by bolts, nuts, and the like at the inter-ring joints 9 arranged at intervals in the circumferential direction of the tunnel. The circumferential direction position of the inter-ring joint 9 is not uniform in this example, and is arbitrarily set for each segment type.

  In FIG. 3, the inter-ring joint 9 is set as a relative position at positions B1 to B17 in order clockwise from the top. Hereinafter, the position number of the inter-ring joint 9 is set to B = 1-17. Here, B is a positive integer.

The division angle and virtual assembly angle of the piece segment P constituting the unequal division segment S are predetermined for each segment type.
Here, the “division angle” is a circumferential angle occupied by each piece segment P. Further, the “virtual assembly angle” is a circumferential angle at which the center in the circumferential direction of each piece segment P is located, for example, when temporarily determined as shown in FIG.

In the example of FIG. 3, the piece numbers of the piece segments P constituting the unequal division segment S are P1 to P8 clockwise from the key segment K in the drawing.
Hereinafter, unless otherwise distinguished, the key segment K is referred to as a piece segment P, and individual piece segments are distinguished by piece numbers P1 to P8.

In FIG. 3, C1 to C32 are virtual ring joints 20 (described later), and the relative positions are set at positions C1 to C32 in order clockwise from the top. Hereinafter, the position number of the virtual inter-ring joint 20 is C = 1 to 32. Here, C is a positive integer.
Details of the virtual inter-ring joint 20 will be described later.

  Moreover, in this figure, 22 is the circumferential direction joint position which connects a piece segment to the circumferential direction.

FIG. 4 shows a state in which the non-uniform division segment S of FIG. 3 is rotated by the assembly offset angle θ1.
The assembly offset angle θ1 will be described later.

  FIG. 5 is a first flowchart of the segment assembling method according to the present invention. This figure shows a method for setting the joint position number N of the inter-ring joint, and includes steps S1 to S9.

In S1, ring information is acquired. The ring information includes the type, width, shape, and circumferential positions of the inter-ring joints B1 to B17, and the like.
In S2, segment information is acquired. The segment information includes the number of divisions of the non-uniform division segment S, the division angle, the virtual assembly angle, the number of bolts of the key segment K, the number of joints between rings, and the like.

In S3, circumferential positions B1 to B17 of the inter-ring joint 9 of the ring to be assembled (“current ring”) are calculated. The circumferential positions B1 to B17 of the inter-ring joint 9 can be obtained from the ring information.
For example, in FIG. 3, the inter-ring joint position B1 is 0 degree from the top, the inter-ring joint position B2 is 11.25 degrees, and the inter-ring joint position B3 is 33.75 degrees.

  In S4, the circumferential interval θ2 of the inter-ring joint 9 is calculated. For example, in FIG. 3, the circumferential interval θ2 of the inter-ring joint B1-B2 is 11.25 degrees, the circumferential interval θ2 of the inter-ring joint position B2-B3 is 22.5 degrees, and the inter-ring joint position B3-B4 The direction interval θ2 is 22.5 degrees.

  In S5, it is determined whether the circumferential interval θ2 of the inter-ring joint 9 is equal. In the case of equality (Yes) in S5, the joint position number N is set to the position number B (= 1 to 17) of the inter-ring joint 9 in S9, and the process ends.

If S5 is not equal (No), the greatest common divisor θ3 of the circumferential interval θ2 of the inter-ring joint 9 is calculated in S6.
Here, the minimum unit of the greatest common divisor θ3 is arbitrary, and is set, for example, in units of 0.01 degrees.
For example, in the example of FIG. 3, when the inter-ring joint interval θ2 of the inter-ring joint 9 is composed of only 11.25 degrees and 22.5 degrees in the circumferential angle, the greatest common divisor θ3 is 11.25 degrees.

In S7, the virtual ring joints C1 to C32 are set from the greatest common divisor θ3, and the virtual ring joint numbers C (= 1 to 32) are set to the virtual ring joints C1 to C32.
The virtual inter-ring joints C1 to C32 are positions where the above-described greatest common divisor θ3 is the circumferential pitch. As shown in FIG. 3, the virtual inter-ring joints C1 to C32 are preferably set so as to include the circumferential positions B1 to B17 of the inter-ring joint 9.
Further, the joint number between virtual rings C (= 1 to 32) is an order set as a relative position in order clockwise from the top as shown in FIG.

  In S8, the joint position number N is set to the virtual ring joint number C (= 1 to 32) of the virtual ring joint 20, and the process is terminated.

  Hereinafter, the circumferential position of the key segment K is referred to as “K position”. The K position can be specified by the virtual ring joint number C (= 1 to 32) of the virtual ring joint 20 described above.

FIG. 6 is a second flowchart of the segment assembling method according to the present invention. This figure shows a method for setting an assembly schedule for each piece segment P, and includes steps S11 to S16.
Each step of FIG. 6 is preferably performed after the method of the first flowchart (FIG. 5) is completed.

In S11, the circumferential position (K position) where the key segment K is located is set by the joint position number N set in the first flowchart (FIG. 5). The joint position number N is the virtual ring joint number C (= 1 to 32) of the virtual ring joint 20 or the position number B (1 to 17) of the ring joint 9.
In S11, an arbitrary adjustment angle θ4 may be input simultaneously with the joint position number N. The adjustment angle θ4 is preferably an angle smaller than the greatest common divisor θ3 described above.

  In S12, the assembly order of the piece segments P, that is, the order of the piece numbers P1 to P8 is determined from the ring information, the segment information, and the order determination conditions.

In S13, the assembly offset angle θ1 at the K position is calculated from the joint position number N.
For example, in the example of FIG. 3, when 4 is input as the joint position number N in S11 and the adjustment angle θ4 is 0 (none), the assembly offset angle θ1 is (N−1) × the greatest common divisor θ3 + θ4 = 3. X 11.25 degrees = 33.75 degrees.

  FIG. 4 shows a state where the non-uniformly divided segment S is turned from FIG. 3 by the assembly offset angle θ1 (= 33.75 degrees), and shows the assembled state of the segment intended by the operator.

In S14 of FIG. 6, the actual assembly angle of each piece segment P is calculated.
This actual assembly angle is, for example, the circumferential angle of the center line of each piece segment P, and is calculated from the division angle and virtual assembly angle of each piece segment P, the circumferential position of the key segment K, and the assembly offset angle θ1. Can do.

  In S15, the turning direction of each piece segment P is calculated. This turning direction is calculated from the order determination condition described above. The turning direction is, for example, no turning, clockwise (clockwise), and counterclockwise (counterclockwise).

In S16, the output device 18 outputs the assembly schedule, that is, the assembly sequence, the assembly angle, and the swivel direction, and the process ends.
The above-described erector apparatus 7 assembles each piece segment P based on this assembly schedule.

FIG. 7 is a third flowchart of the segment assembling method according to the present invention. This figure shows a method of calculating the position of the inter-ring joint 9 common to the front ring and the current ring, and includes steps (steps) S21 to S25.
Each step of FIG. 7 is preferably performed after the method of the second flowchart (FIG. 6) is completed.

  In S21, assembly angle information of the ring assembled immediately before (“front ring”) is acquired. This assembly angle information includes ring information of the front ring stored in the storage device 12, segment information, a circumferential position (K position) where the key segment K is located, an assembly angle (assembly position) of each piece segment P, and the like. .

  In S22, the inter-ring joint position 9 of the front ring is calculated from the data acquired in S21.

In S23, the inter-ring joint position 9 of the current ring is calculated from the data acquired by the method of the second flowchart (FIG. 6).
In S24, a common joint position common to the front ring and the current ring is calculated.
In S25, the common joint position is displayed and the method of the third flowchart is ended.

If the common joint position obtained in S25 matches the position planned in advance, it is “normal”, and each piece segment P can be assembled based on the assembly order.
When the common joint position does not match or is insufficient with the position planned in advance, it is preferable to display “error” and review the assembly schedule.

FIG. 8 is a fourth flowchart of the segment assembling method according to the present invention. This figure shows a method for calculating the position of the circumferential joint common to the front ring and the current ring, and includes steps (steps) S31 to S38.
Each step of FIG. 8 is preferably performed after the method of the second flowchart (FIG. 6) is completed. Each step in FIG. 8 can be performed in parallel with the method of the third flowchart (FIG. 7).

In S31, the assembly angle information of the front ring assembled immediately before is acquired. This assembly angle information includes ring information of the front ring stored in the storage device 12, segment information, a circumferential position (K position) where the key segment K is located, an assembly angle (assembly position) of each piece segment P, and the like. .
In addition, S31 can be abbreviate | omitted when performing each step of FIG. 8 after execution of the method of a 3rd flowchart (FIG. 7).

In S32, the circumferential joint position of the front ring is calculated from the data acquired in S31 (or S21).
In S33, the position of the circumferential joint in the current ring after assembly is calculated from the circumferential position of the key segment K and the actual assembly angle of each piece segment P.

  In S34, it is determined whether the circumferential joint positions of the front ring and the current ring match. If the circumferential joint positions match (Yes), the strength is “declining”, and an error is displayed in S37, and the method of FIG. 8 ends. In this case, it is necessary to review the assembly schedule of the current ring.

  If the circumferential joint position does not match in S34 (No), it is determined in S35 whether the difference in circumferential joint position is within a predetermined allowable angle α. The allowable angle α is, for example, +/− 5 degrees, and can be arbitrarily set in advance.

  If the difference exceeds the allowable angle α (Yes) in S35, there is a possibility of “strengthening” in which the strength decreases, and a warning is displayed in S38, and the method of FIG. 8 ends. In this case, it is preferable to review the assembly schedule.

  If the difference does not exceed the allowable angle α in S35 (No), it is “normal”, normal is displayed in S36, and the method of FIG. 8 ends.

According to the above-described method and apparatus of the present invention, the virtual inter-ring joints C1 to C32 having the greatest common divisor θ3 of the circumferential interval θ2 of the inter-ring joint 9 as the circumferential pitch are set by the arithmetic unit 16, and each virtual ring is set. Since the virtual ring joint number C (= 1 to 32) is set in the joints C1 to C32, the circumferential position of the key segment K is designated by the virtual ring joint number C (= 1 to 32) by the input device 14. be able to.
Therefore, even in the non-uniformly divided segment S, the position of the key segment K is designated by the virtual inter-ring joint number C (= 1 to 32) regardless of the segment type, and the assembly angle of each piece segment P is determined. Can be set automatically.

  Also, the circumferential position of the inter-ring joint 9 in the current ring after assembly is calculated from the circumferential position of the key segment K and the circumferential position of the inter-ring joint 9 with respect to the key segment K. By calculating the circumferential position of the inter-ring joint 9 that is common to the rings, the position of the inter-ring joint 9 that connects the front ring and the current ring is determined regardless of the segment type, even for the non-uniformly divided segment S. It can be checked accurately.

  Further, the circumferential joint position 22 in the current ring after assembly is calculated from the circumferential position of the key segment S and the actual assembly angle of each piece segment P, and the circumferential direction common to the previous ring and the current ring assembled immediately before By calculating the joint position 22, it is possible to accurately check the presence or absence of the braid where the circumferential joint position 22 of the front ring and the current ring overlaps, regardless of the segment type, even in the non-uniformly divided segment S. .

  In addition, this invention is not limited to embodiment mentioned above, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

1 shield excavator, 2 main body, 3 cutter head,
4 shield jack, 5 frame, 6 transport device,
6a bogie, 6b crane, 6c conveyor,
7 Electa device, 7a Swivel ring,
7b Axial direction moving part, 7c Gripping device, 7d Radial direction moving part,
8 guide members, 9 joints between rings,
10 segment assembly equipment,
12 storage devices, 14 input devices,
16 arithmetic units, 18 output units,
20 Virtual ring joint, 22 Circumferential joint position

Claims (6)

An assembly method of non-uniformly divided segments assembled in an annular shape along the inner peripheral wall of a tunnel,
The non-uniform division segment is composed of a plurality of piece segments divided in the circumferential direction, and the piece segment assembled last is a key segment,
(A) From the circumferential position of the inter-ring joint in the ring in which the piece segments are annularly assembled, the greatest common divisor of the circumferential interval of the inter-ring joint is calculated,
(B) setting a virtual inter-ring joint having the greatest common divisor as a circumferential pitch;
(C) A virtual ring joint number is set for each virtual ring joint,
(D) A method of assembling a non-uniformly divided segment, comprising assembling a piece segment by designating a circumferential position of the key segment by the joint number between virtual rings. Store segment data including division angle and virtual assembly angle of each piece segment,
Determine the circumferential position of the key segment from the joint number between the virtual rings,
Determine the actual assembly angle, assembly order, and swivel direction of each piece segment from the segment data,
2. The method of assembling an unequal division segment according to claim 1, wherein each piece segment is assembled based on the assembly order. From the circumferential position of the key segment and the circumferential position of the inter-ring joint, calculate the circumferential position of the inter-ring joint in the current ring after assembly.
The method for assembling an unevenly divided segment according to claim 2, wherein the circumferential position of the joint between the rings common to the front ring and the current ring assembled immediately before is calculated. From the circumferential position of the key segment and the actual assembly angle of each piece segment, calculate the position of the circumferential joint in the current ring after assembly,
The method of assembling an unevenly divided segment according to claim 2, wherein the position of the circumferential joint common to the previous ring and the current ring assembled immediately before is calculated. An assembly device for non-uniformly divided segments assembled in an annular shape along the inner peripheral wall of a tunnel,
The non-uniform division segment is composed of a plurality of piece segments divided in the circumferential direction, and the piece segment assembled last is a key segment,
A storage device for storing a circumferential position of an inter-ring joint in a ring in which the piece segments are annularly assembled;
Calculate the greatest common divisor of the circumferential spacing of the inter-ring joint,
Set the virtual inter-ring joint with the greatest common divisor as the circumferential pitch,
An arithmetic unit for setting a joint number between virtual rings for each joint between the virtual rings;
An input device for designating the circumferential position of the key segment by the joint number between the virtual rings;
And an erector device for assembling the piece segments. The storage device stores segment data including a division angle and a virtual assembly angle of each piece segment;
The arithmetic unit determines a circumferential position of the key segment from the joint number between the virtual rings,
Determine the actual assembly angle, assembly order, and swivel direction of each piece segment from the segment data,
The non-uniformly divided segment assembling apparatus according to claim 5, wherein the erector apparatus assembles each piece segment based on the assembling order.