JP2005023686A - Tunnel excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel excavator capable of easily digging tunnels having different shape and cross section and discharging soil stably by improving fluidity of dug sediment in a chamber to improve work efficiency of tunnel excavation work. <P>SOLUTION: A cutter 18 composed of groups 15 to 17 of cutters is mounted in a front part of an excavator main body 11, and a first cutter head 19 and a second cutter head 20 of the first group 15 of cutters are arranged adjacent to each other within the same face to rotate in synchronization in the reverse direction. A third cutter head 21 and a fourth cutter head 22 of the second group 16 of cutters are arranged adjacent to each other within the same face to rotate in synchronization in the reverse direction. A fifth cutter head 23 and a sixth cutter head 24 are arranged by deviating behind from the first and second cutter heads 19, 20, are arranged adjacent to each other within the same face to rotate in synchronization in the reverse direction, and are arranged at the same positions in the direction of digging as the first and second cutter heads 19, 20. Stirring blades 71 to 76 are fixed to rear parts of each cutter head 19 to 24. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tunnel excavator that excavates the ground and constructs a tunnel.
[0002]
[Prior art]
In general tunnel excavators, a disc-shaped cutter head is rotatably mounted on the front part of a cylindrical excavator body, and this cutter head is supported by a driving device so as to be driven to rotate and discharge excavated sediment. On the other hand, a screw conveyor is arranged, and a number of shield jacks for advancing the excavator body at the rear and an erector device for assembling the segments on the inner wall surface of the existing tunnel are mounted. Therefore, when the shield jack is extended while rotating the cutter head, the excavator body moves forward with the reaction force from the existing segment, so that the cutter head excavates the ground in front and the excavated soil is externally removed by the screw conveyor. In addition, the erector device constructs the tunnel by assembling the segments on the inner wall surface of the existing tunnel.
[0003]
By the way, the circular cross-section tunnel constructed by the tunnel excavator described above is often used as a subway tunnel or an automobile road. In this case, since the use area in the tunnel is rectangular, the rectangular cross-section from the beginning. There is a desire to dig a tunnel. As tunnel excavation capable of excavating a rectangular cross-section tunnel, for example, there is one described in Patent Document 1 below. In the tunnel excavator described in Patent Document 1, a circular cutter is attached to a front portion of a rectangular skin plate so as to be able to be driven and rotated, and a swing cutter is attached to the circular cutter, and a predetermined value is obtained during rotation of the circular cutter. By projecting the swing cutter at the angular position, a tunnel having a rectangular cross section is excavated by the circular cutter and the swing cutter.
[0004]
[Patent Document 1]
JP-A-10-280873 Publication
[Problems to be solved by the invention]
In the conventional tunnel excavator described above, a tunnel having a rectangular cross section is excavated by excavating an area that cannot be excavated with a circular cutter with a swing cutter. However, the swing cutter is a cantilever support in which only a base end portion supports a circular cutter, and the area that can be excavated by this swing cutter is limited to the upper limit of experience. For this reason, it is necessary to increase the support rigidity of the swing cutter, which leads to a complicated structure, an increase in size, and an increase in weight.
[0006]
In addition, when the ground excavating the tunnel is clay, additives are injected to promote the plastic fluidization of the excavated soil between the face and the bulkhead, and the excavated sediment and additive are agitated well. While being discharged by the screw conveyor. Therefore, a plurality of stirring blades protruding toward the chamber are provided at the rear part of the cutter head. However, in the conventional tunnel excavator described above, a stirring blade cannot be provided at the rear of the swing cutter due to strength restrictions, and the excavated sediment cannot be stirred over the entire region of the chamber. Then, the excavated earth and sand adheres to the back side of the cutter head and the inner surface of the skin plate, and the excavated earth and sand does not flow well in the chamber and the earth cannot be discharged stably. It becomes impossible to dig itself.
[0007]
The present invention solves such problems, and makes it possible to easily excavate a desired cross-section tunnel and improve the fluidity of excavated sediment in the chamber to enable stable soil excavation. An object of the present invention is to provide a tunnel excavator that improves work efficiency.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a tunnel excavator according to the invention of claim 1 is a tubular excavator main body having a chamber at a front portion thereof, a propulsion jack for advancing the excavator main body, and the excavator main body. A cutter attached to the front of the chamber, and a soil discharging means for discharging the earth and sand in the chamber. The cutter is provided with a plurality of cutter heads adjacent to each other in the same plane so as to be synchronously rotatable with each other. A first cutter group and a plurality of cutter heads are adjacent to each other in the same plane and can be rotated synchronously with each other and with the first cutter group. It has a two-cutter group and a plurality of stirring blades protruding from the respective cutter heads toward the chamber.
[0009]
In a tunnel excavator according to a second aspect of the present invention, the rotation directions of adjacent cutter heads among the plurality of cutter heads are opposite directions.
[0010]
In the tunnel excavator according to a third aspect of the present invention, the plurality of cutter heads have spokes attached in a radial direction from a drive shaft, and a plurality of cutter bits are fixed to the front surface of the spokes, while the spokes are provided on the rear surface of the spokes. The stirring blade is fixed.
[0011]
In a tunnel excavator according to a fourth aspect of the invention, a plurality of spokes are attached to the drive shaft at equal intervals, and the stirring blades are fixed at different positions in the longitudinal direction of the plurality of spokes.
[0012]
In a tunnel excavator according to a fifth aspect of the present invention, fixed blades are fixed to the excavator body side that does not interfere with each other in correspondence with the stirring blades of the cutter head.
[0013]
In the tunnel excavator according to claim 6, the excavation regions of adjacent cutter heads among the plurality of cutter heads overlap, while the outermost excavation of the cutter heads located diagonally among the plurality of cutter heads. It is characterized by contacting the diameter.
[0014]
In a tunnel excavator according to a seventh aspect of the present invention, a third cutter group in which a plurality of cutter heads are adjacent to each other in the same plane and can be rotated synchronously with each other is provided adjacent to the second cutter group. Each cutter head has a plurality of agitating blades projecting from the chamber side, and the third cutter group is shifted forward and backward in the excavation direction with respect to the second cutter group, and substantially the same position in the excavation direction with respect to the first cutter group. It is characterized by having been arranged in.
[0015]
In the tunnel excavator of the eighth aspect of the invention, the cutter heads of the first and third cutter groups have substantially the same diameter, and the outer diameters of the cutter heads of the second cutter group are the first and third cutters. It is characterized by a smaller diameter than each cutter head of the cutter group.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0017]
FIG. 1 is a front view of a tunnel excavator according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of the tunnel excavator of the present embodiment, and FIG. 3 is an excavation sediment mixing region by the tunnel excavator of the present embodiment. An outline is shown.
[0018]
In the tunnel excavator of the present embodiment, as shown in FIGS. 1 and 2, the excavator body 11 has a rectangular cylindrical shape, and is configured such that a front cylinder 12 and a rear cylinder 13 having substantially the same shape are connected to be bendable. A plurality of middle-folded jacks 14 are installed between the front cylinder 12 and the rear cylinder 13. Therefore, the excavating direction of the excavator body 11 can be changed by bending the front cylinder 12 with respect to the rear cylinder 13 by the expansion / contraction operation of the center folding jack 14.
[0019]
At the front part of the excavator main body 11, a cutter 18 composed of three cutter groups 15, 16, 17 provided with two cutter heads adjacent to each other so as to be able to rotate synchronously with each other is mounted. That is, the first cutter group 15 has first and second cutter heads 19 and 20 arranged side by side on the front upper part of the front cylinder 12, and the third cutter group 17 is arranged on the front lower part of the front cylinder 12. The second cutter group 16 includes the first and second cutter heads 19 and 20 and the fifth and sixth cutter heads at the front part of the front barrel 12. There are third and fourth cutter heads 21 and 22 arranged side by side between the cutter heads 23 and 24. The first and second cutter heads 19 and 20 of the first cutter group 15 are adjacent to each other in the same plane and can be synchronously rotated in opposite directions. The third and fourth cutter heads of the second cutter group 16 21 and 22 are adjacent to each other in the same plane and can be synchronously rotated in opposite directions, and are shifted from the first and second cutter heads 19 and 20 to the rear in the excavation direction. Further, the fifth and sixth cutter heads 23 and 24 of the third cutter group 17 are adjacent to each other in the same plane and can be synchronously rotated in opposite directions, and are the same as the first and second cutter heads 19 and 20. It is disposed in the plane, that is, at substantially the same position in the excavation direction.
[0020]
That is, a bulk head 25 is formed at the front portion of the front barrel 12, and cutter driving portions 28 and 29 having a plurality of cutter turning motors 26 and 27 are mounted on the bulk head 25, respectively. The first and second cutter heads 19 and 20 can be driven and rotated by the portions 28 and 29. The first and second cutter heads 19 and 20 are attached with three spokes 32 and 33 in the radial direction from the front ends of the drive shafts 30 and 31 at equal intervals in the circumferential direction. A large number of cutter bits 34 and 35 are fixed, and copy cutters 36 and 37 that can be freely projected and retracted are attached to the tip portion.
[0021]
Further, cutter drive units 40 and 41 having a plurality of cutter turning motors 38 and 39 are mounted on the upper and lower intermediate portions of the bulkhead 25, and the third and fourth cutter heads 21 and 22 are mounted by the cutter drive units 40 and 41, respectively. The drive can be rotated. The third and fourth cutter heads 21 and 22 are attached with three spokes 44 and 45 in the radial direction from the front end portions of the drive shafts 42 and 43 at equal intervals in the circumferential direction. A large number of cutter bits 46 and 47 are fixed, and copy cutters 48 and 49 which can be freely moved at the front end are mounted.
[0022]
Further, cutter driving units 52 and 53 each having a plurality of cutter turning motors 50 and 51 are mounted below the bulk head 25, and the fifth and sixth cutter heads 23 and 24 are driven to rotate by the cutter driving units 52 and 53. It is possible. The fifth and sixth cutter heads 23 and 24 are attached with three spokes 56 and 57 in the radial direction from the front ends of the drive shafts 54 and 55 at equal intervals in the circumferential direction. A large number of cutter bits 58 and 59 are fixed, and copy cutters 60 and 61 which can be freely projected and retracted are attached to the tip portions.
[0023]
In this case, the first and second cutter heads 19 and 20 of the first cutter group 15 have mutually opposite rotation regions (excavation regions), but the positions of the corresponding spokes 32 and 33 are shifted in opposite directions. Synchronous rotation prevents contact. In addition, the third and fourth cutter heads 21 and 22 of the second cutter group 16 are also synchronized with each other in the opposite directions because the positions of the corresponding spokes 44 and 45 are shifted although the rotation areas (excavation areas) overlap each other. By rotating, it is not in contact. Further, the fifth and sixth cutter heads 23 and 24 of the third cutter group 17 are also synchronized with each other in the opposite directions because the positions of the corresponding spokes 56 and 57 are shifted, although the rotation regions (excavation regions) overlap each other. By rotating, it is not in contact.
[0024]
Similarly, although the adjacent first, third, and fifth cutter heads 19, 21, and 23 overlap each other's rotation areas (excavation areas), the positions of the corresponding spokes 32, 44, and 56 are shifted from each other. Synchronous rotation in the reverse direction prevents contact. In addition, the adjacent second, fourth, and sixth cutter heads 20, 22, and 24 overlap with each other, but the positions of the corresponding spokes 33, 45, and 57 are shifted and opposite to each other. Synchronous rotation in the direction prevents contact.
[0025]
On the other hand, the first, fourth, and fifth cutter heads 19, 22, and 23 positioned diagonally rotate synchronously in the same direction, but are not in contact with each other because they are displaced forward and backward in the excavation direction, The excavation residual part is eliminated by contacting the rotation outermost diameter (excavation outermost diameter) without overlapping each other's rotation area (excavation area). In addition, the second, third, and sixth cutter heads 20, 21, and 24 positioned diagonally rotate synchronously in the same direction, but are not in contact with each other because they are displaced in the front and rear directions in the excavation direction. The excavation residual part is eliminated by contacting the rotation outermost diameter (excavation outermost diameter) without overlapping each other's rotation area (excavation area). The first, second, fifth, and sixth cutter heads 19, 20, 23, and 24 have substantially the same outer diameter, and the third and fourth cutter heads 21 and 22 have outer diameters. Is smaller than each cutter head 19, 20, 23, 24, and a substantially similar region of the excavator body 11 can be excavated.
[0026]
Accordingly, when the cutter driving units 28, 29, 40, 41, 52, 53 are driven, the first, fourth, and fifth cutter heads 19, 22, 23 are synchronously rotated in the clockwise direction, and the second, third, The sixth cutter heads 20, 21, 24 can be rotated synchronously in the counterclockwise direction, and the front ground can be excavated by the respective cutter bits 34, 35, 46, 47, 58, 59. By projecting the copy cutters 36, 37, 48, 49, 60, and 61 at a predetermined rotational angle position of 24, the corners, upper and lower parts, and side parts of the excavator body 11 that cannot be excavated by the cutter heads 19 to 24 are excavated. can do.
[0027]
A chamber 62 is formed between the cutter heads 19 to 24 and the bulkhead 25 at the front portion of the excavator body 11. In the excavator body 11, a screw conveyor 63 as a soil discharging means is disposed in a forward inclined posture, and a front end portion of the screw conveyor 63 passes through the bulkhead 25 and is positioned in the chamber 62. Further, stirring blades 71 to 76 are fixed to the rear portions of the spokes 32, 33, 44, 45, 56, and 57 of the cutter heads 19 to 24, respectively, while a plurality of fixed blades 77 are fixed to the front portion of the bulkhead 25. It is fixed. In this case, for example, the first cutter head 19 has three spokes 32, and one agitating blade 71 is fixed to each spoke 32. (Diameter direction) It is a different position. The second to sixth cutter heads 20 to 24 have the same configuration. A plurality of fixed blades 77 are fixed to the bulkhead 25 outside the swirl region of the stirring blades 71 to 76 in each cutter head 19 to 24.
[0028]
Therefore, when the cutter heads 19 to 24 are turned, the stirring blades 71 to 76 are turned together with the spokes 32, 33, 44, 45, 56, 57, so that the excavated earth and sand in the chamber 62 is stirred together with the fixed blades 77. can do. At this time, as shown in FIG. 3, the fixing positions of the stirring blades 71 to 76 are different in the spokes 32, 33, 44, 45, 56, 57, and the spokes 32, 33, 44, 45, 56, 57, Since 57 rotate without contacting each other, each stirring blade 71-76 can move to almost the area | region in the chamber 62, and can dig excavated earth and sand.
[0029]
A plurality of shield jacks 81 are juxtaposed along the circumferential direction on the rear barrel 13 of the excavator body 11, and the shield jacks 81 extend rearward in the digging direction to connect the spreader 82 to the existing segment S. The excavator body 11 can be moved forward by the reaction force. An erector device 83 for assembling the segment S into a ring shape is attached to the rear end portion of the rear cylinder 13.
[0030]
Here, the tunnel excavation work by the tunnel excavator of the above-described embodiment will be described.
[0031]
As shown in FIGS. 1 and 2, first, the shield jack 81 is extended and excavated from the existing segment S while the cutter heads 19 to 24 are rotated by the cutter driving units 28, 29, 40, 41, 52, and 53. The excavator body 11 is moved forward with the reaction force. Then, a large number of cutter bits 34, 35, 46, 47, 58, 59 of the rotating cutter heads 19 to 24 excavate the front ground to form a tunnel.
[0032]
At this time, the first, fourth, and fifth cutter heads 19, 23, and 23 are synchronously rotated in the clockwise direction, and the second, third, and sixth cutter heads 20, 21, and 24 are synchronously rotated in the counterclockwise direction. In addition, by projecting the copy cutters 36, 37, 48, 49, 60, 61 at a predetermined rotational angle position, the spokes 32, 33, 44, 45, 56, 57 do not come into contact with each other, and the excavator body An area slightly larger than 11 can be excavated.
[0033]
And the earth and sand generated by ground excavation of each cutter head 19-24 are taken in into the chamber 62, and a mud material is discharged to the excavated earth and sand of this chamber 62 from the injection hole which is not shown in figure as needed. Then, the earth and sand are agitated by the agitating blades 71 to 76 and the stationary wing 77 that move in the chamber 62 as the cutter heads 19 to 24 rotate, and are appropriately mixed with the mud material. The plastic fluidization of the excavated soil is promoted, and the screw conveyor 63 can appropriately discharge the soil.
[0034]
At this time, the plurality of stirring blades 71 to 76 move most of the region in the chamber 62 to stir the excavated earth and sand, so that clayey earth and sand adhere to the cutter heads 19 to 24 and the excavator main body 11. And can be surely discharged. In addition, the amount of earth and sand corresponding to the amount of excavation by the cutter heads 19 to 24 is discharged by the screw conveyor 63, so that the chamber 62 can be filled and pressurized with the earth and sand to stabilize the face.
[0035]
As described above, in the tunnel excavator according to the present embodiment, the cutter 18 including the three cutter groups 15, 16, and 17 is attached to the front portion of the excavator main body 11, and the first, The second cutter heads 19 and 20 are adjacent to each other in the same plane and can be synchronously rotated in opposite directions, and the third and fourth cutter heads 21 and 22 of the second cutter group 16 are adjacent to each other in the same plane and opposite to each other. The first and second cutter heads 19 and 20 are disposed behind the first and second cutter heads 19 and 20, and the fifth and sixth cutter heads 23 and 24 of the third cutter group 17 are adjacent to each other in the same plane. The first and second cutter heads 19, 20 are arranged at the same position in the digging direction, and can be rotated synchronously in opposite directions. ~ 76 are fixed.
[0036]
Therefore, the six cutter heads 19 to 24 can be efficiently arranged, and the rotational direction is controlled and synchronously rotated to easily excavate the irregular cross-section tunnel without contacting each other. The agitating blades 71 to 76 move most of the region in the chamber 62 to agitate the excavated earth and sand, thereby improving the fluidity of the excavated earth and sand in the chamber to the cutter heads 19 to 24 and the excavator main body 11. Therefore, it is possible to improve the work efficiency of tunnel excavation work by preventing the adhesion of earth and sand and enabling stable soil removal.
[0037]
In the above-described embodiment, one stirring blade 71 to 76 is fixed to each of the spokes 32, 33, 44, 45, 56, and 57. However, a plurality of stirring blades may be fixed, or one spoke 32 and 33 may be fixed. , 44, 45, 56, and 57 may be fixed with a plurality of stirring blades, as long as the excavated earth and sand in the most part of the chamber 62 can be stirred by the stirring blades. Further, the number of spokes for one cutter head is not limited to three, and may be one, two, or four or more.
[0038]
The cutter 18 is composed of three cutter groups 15 to 17 and six cutter heads 19 to 24. The number of cutter groups and cutter heads may be set as appropriate according to the cross-sectional shape of the tunnel to be excavated. . Furthermore, although the second cutter group 16 is disposed rearward in the digging direction with respect to the first and third cutter groups 15, 17, the second cutter group 16 may be disposed forward in the digging direction.
[0039]
【The invention's effect】
As described above in detail in the embodiment, according to the tunnel excavator of the invention of claim 1, the cutter mounted on the front portion of the excavator body is connected to each other with a plurality of cutter heads adjacent to each other in the same plane. The first cutter group provided so as to be able to rotate synchronously and the plurality of cutter heads are adjacent to each other in the same plane and can be rotated synchronously with the first cutter group and are displaced in the front and rear direction of excavation with respect to the first cutter group. And a plurality of stirring blades projecting from each cutter head toward the chamber, so that the plurality of cutter heads can be efficiently arranged and the rotation direction can be controlled. By rotating synchronously, the desired cross-section tunnel can be easily excavated without touching each other, and multiple agitating blades move in most areas of the chamber to agitate the excavated sediment. Preventing soil from adhering to such a cutter head and excavator body by improving the fluidity of the excavated earth and sand, it is possible to improve the work efficiency of the tunneling work as possible stable dumping.
[0040]
According to the tunnel excavator of the second aspect of the present invention, since the rotation directions of the adjacent cutter heads among the plurality of cutter heads are opposite directions, the plurality of cutter heads are arranged at predetermined positions without contact. be able to.
[0041]
According to the tunnel excavator of the invention of claim 3, the plurality of cutter heads are provided with spokes attached in a radial direction from the drive shaft, and a plurality of cutter bits are fixed to the front surface of the spoke, while stirring blades are provided on the rear surface of the spoke. Since they are fixed, it is possible to prevent contact between adjacent cutter heads with a simple configuration.
[0042]
According to the tunnel excavator of the invention of claim 4, since the plurality of spokes are attached to the drive shaft at equal intervals and the stirring blades are fixed at different positions in the longitudinal direction of the plurality of spokes, the stirring blades are arranged in a balanced manner. Therefore, a large stirring area can be secured with a small number of stirring blades.
[0043]
According to the tunnel excavator of the invention of claim 5, since the fixed blade is fixed to the excavator body side that does not interfere with each other corresponding to the stirring blade of the cutter head, the stirring efficiency of the excavated soil is improved by the stirring blade and the fixed blade. As a result, proper soil removal can be achieved.
[0044]
According to the tunnel excavator of the sixth aspect of the present invention, the excavation areas of adjacent cutter heads among the plurality of cutter heads overlap, while the outermost excavation of the cutter heads located diagonally among the plurality of cutter heads. Since the diameters are brought into contact with each other, the contact between a plurality of adjacent cutter heads can be prevented with a simple configuration, and a predetermined excavation area can be secured.
[0045]
According to the tunnel excavator of the seventh aspect of the present invention, the third cutter group is provided adjacent to the second cutter group so that the plurality of cutter heads are adjacent to each other in the same plane and can rotate synchronously with each other. A plurality of agitating blades are provided on each cutter head on the chamber side, and the third cutter group is displaced forward and backward in the excavation direction with respect to the second cutter group, and disposed at substantially the same position in the excavation direction with respect to the first cutter group. Therefore, a tunnel having a rectangular shape can be easily excavated.
[0046]
According to the tunnel excavator of the eighth aspect of the invention, the cutter heads of the first and third cutter groups have substantially the same diameter, and the outer diameters of the cutter heads of the second cutter group are the first and third cutter groups. Because the diameter is smaller than each cutter head of the group, when excavating a tunnel having a rectangular shape, the tunnel of the desired shape can be easily excavated by adjusting the size of each cutter head of the second cutter group Can do.
[Brief description of the drawings]
FIG. 1 is a front view of a tunnel excavator according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of the tunnel excavator of the present embodiment.
FIG. 3 is a schematic view showing an excavated sediment mixing region by the tunnel excavator of the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Excavator main body 15 1st cutter group 16 2nd cutter group 17 3rd cutter group 18 Cutter 19 1st cutter head 20 2nd cutter head 21 3rd cutter head 22 4th cutter head 23 5th cutter head 24 6th cutter Head 25 Bulkhead 32, 33, 44, 45, 56, 57 Spoke 63 Screw conveyor (soil removal means)
71-76 Stirring blade 77 Fixed blade

Claims (8)

Excavator body that has a cylindrical shape and has a chamber at the front, a propulsion jack that advances the excavator body, a cutter that is attached to the front of the excavator body, and a discharge that discharges sediment in the chamber. The cutter includes a first cutter group in which a plurality of cutter heads are provided adjacent to each other in the same plane so as to be synchronously rotatable with each other, and a plurality of cutter heads are adjacent to each other in the same plane and A second cutter group that can rotate synchronously with the first cutter group and is displaced from the first cutter group in the front-rear direction of the excavation direction, and projects from the respective cutter heads toward the chamber. A tunnel excavator comprising a plurality of stirring blades. 2. The tunnel excavator according to claim 1, wherein rotation directions of adjacent cutter heads among the plurality of cutter heads are opposite directions. 2. The tunnel excavator according to claim 1, wherein the plurality of cutter heads have spokes attached in a radial direction from a drive shaft, and a plurality of cutter bits are fixed to a front surface of the spokes, while the agitation is provided on a rear surface of the spokes. Tunnel excavator with fixed wings. The tunnel excavator according to claim 3, wherein a plurality of the spokes are attached to the drive shaft at equal intervals, and the stirring blades are fixed at different positions in the longitudinal direction of the plurality of spokes. . 2. The tunnel excavator according to claim 1, wherein fixed wings are fixed to the excavator main body side that do not interfere with each other corresponding to the agitation blades of the cutter head. 2. The tunnel excavator according to claim 1, wherein an excavation area between adjacent cutter heads among the plurality of cutter heads overlaps, while an outermost diameter of the excavation between the cutter heads located diagonally among the plurality of cutter heads. Tunnel excavator characterized by contacting with each other. 2. The tunnel excavator according to claim 1, wherein a third cutter group in which a plurality of cutter heads are adjacent to each other in the same plane and capable of synchronous rotation is provided adjacent to the second cutter group, and each of the third cutter groups is provided. A plurality of stirring blades project from the cutter head on the chamber side, and the third cutter group is shifted forward and backward in the excavation direction with respect to the second cutter group, and at substantially the same position in the excavation direction with respect to the first cutter group. A tunnel excavator characterized by being arranged. 2. The tunnel excavator according to claim 1, wherein the cutter heads of the first and third cutter groups have substantially the same diameter, and the outer diameters of the cutter heads of the second cutter group are set to the first and third cutter groups. Tunnel excavator characterized by a smaller diameter than each group of cutter heads.

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