JP3841626B2 - Widening shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a widening type shield machine capable of expanding the width of a tunnel during excavation.
[0002]
[Prior art]
In a conventional shield machine, a copy cutter is provided on a cutter head disposed in front of a shield body, and the tunnel is expanded by increasing the amount of excavation. In addition, in order to excavate a tunnel having a horizontal or vertical cross section, a cutter head that reciprocates along the excavation surface has been proposed.
[0003]
[Problems to be solved by the invention]
However, in the conventional configuration provided with a copy cutter, there is a problem that when the amount of widening increases, the load on the copy cutter increases and the expansion range is limited.
[0004]
In the conventional configuration in which the cutter head is moved, the cutter drive shaft for rotating the cutter head or the support of the cutter drive shaft is linearly reciprocated, but the pressure at the front of the shield body supports the face collapse earth pressure. There is a partition wall, and the cutter drive shaft is supported through. Therefore, there has been a problem that it is difficult to improve the durability and reliability of the seal structure of the support portion that supports the cutter drive shaft so as to be able to reciprocate.
[0005]
An object of the present invention is to solve the above-described problems and to provide a widening type shield machine capable of extending the expansion range and improving the durability and reliability of the seal portion of the pressure bulkhead.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a cutter head having a tunnel width extended during excavation of a tunnel by a cutter head disposed at a front portion of a shield body via a cutter drive shaft. In a widening type shield machine that assembles a wide lining body within a shield body that has been widened in accordance with the width, a pressure bulkhead that holds earth pressure is provided at the front of the shield body. An outer peripheral rotating drum that is rotatably arranged around, an inner peripheral eccentric drum that is supported on the outer peripheral rotating drum so as to be rotatable around an eccentric shaft center that is a predetermined distance away from the shield shaft, and a cutter that is attached to the inner peripheral eccentric drum. A bearing hole for rotatably supporting the drive shaft is provided, and each of the rotating sliding portions has a seal structure, and the outer peripheral rotating drum and the inner peripheral eccentric drum are respectively driven to rotate. The cutter drive shaft from the shield axis is provided with a cutter widening moving device for linearly reciprocated in the widening direction.
[0007]
According to the above configuration, the cutter drive shaft that is linearly reciprocated by the cutter widening movement device is caused to follow in the pressure partition by the reciprocating rotation of the inner peripheral eccentric drum and the outer peripheral rotary drum. Rotating sliding part of partition wall and outer peripheral rotating drum, rotating sliding part of outer peripheral rotating drum and inner peripheral eccentric drum, rotating sliding part of inner peripheral eccentric drum and cutter drive shaft, and seal structure compared to linear sliding part Can be provided with high durability and high reliability, and the sealing performance of the pressure bulkhead seal structure can be further improved. Further, the widening movement range of the cutter head can be increased.
According to a second aspect of the present invention, there is provided a sealing structure in which the sealing material is interposed between the pressure partition and the outer peripheral rotating drum, between the outer peripheral rotating drum and the inner peripheral eccentric drum, and between the bearing hole and the cutter drive shaft. It is what.
[0008]
According to the above configuration, it becomes possible to reliably seal the cutter drive shaft that linearly reciprocates in the widening direction with the seal material, and the durability and reliability of the seal structure can be further improved.
[0009]
According to a third aspect of the present invention, in the cutter widening movement device having the above-described configuration, a bearing body that is disposed at the rear portion of the inner circumferential eccentric drum and rotatably supports the cutter drive shaft, and this bearing body is guided in the widening direction. A guide means and a widening drive unit for excavation for linearly reciprocating the bearing body are provided.
[0010]
According to the above configuration, since the excavation widening drive device for linearly reciprocating the bearing body is provided, movement control in the widening direction can be easily performed, and widening driving force can be easily obtained. Further, since the cutter head's own weight and excavation force are supported by the excavation widening drive device, the outer peripheral rotating drum and the inner peripheral eccentric drum do not require high strength, and the structure can be simplified.
[0011]
Furthermore, in the invention described in claim 4, in the above configuration, the cutter widening moving device is provided with an auxiliary rotation driving device capable of rotationally driving the outer peripheral rotating drum and the inner peripheral eccentric drum.
[0012]
According to the above configuration, by applying a rotational force that can rotate each drum by the auxiliary rotational drive device, it is possible to reduce the force received from the cutter drive shaft, particularly at the stroke end in the widening drive device for excavation. The load can be reduced, and the cutter head can be smoothly reciprocated in the expansion / contraction direction even if the excavation widening drive device is small. In addition, the rotational positions of the outer peripheral rotating drum and the inner peripheral eccentric drum can be detected using these auxiliary rotational driving devices, and the outer peripheral rotating drum and the inner peripheral eccentric drum are fixed by the auxiliary rotational driving device during normal excavation. Can do.
[0013]
Furthermore, the invention of claim 5 comprises a cutter widening movement device comprising an outer peripheral drum rotating device that drives the outer peripheral rotating drum to reciprocate and an inner peripheral eccentric drum rotating device that drives the inner peripheral eccentric drum to reciprocate. .
[0014]
According to the above configuration, the cutter driving shaft can be linearly reciprocated via the outer peripheral rotating drum and the inner peripheral eccentric drum by the two rotational forces of the outer peripheral drum rotating device and the inner peripheral eccentric drum rotating device. The expansion range of the head can be ensured sufficiently large, and the durability and reliability of the seal portion of the pressure partition can be enhanced by the rotational sliding contact portion of the outer peripheral rotating drum and the inner peripheral eccentric drum.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Here, a first embodiment of the widening shield machine according to the present invention will be described with reference to FIGS.
[0016]
As shown in FIGS. 1 to 7, this shield machine rotates a cutter head 2 arranged at the front of the shield body 1 around a shield axis O (including an axis parallel to the shield axis O). It can be driven and linearly reciprocated in the widening direction to excavate a wide tunnel widening part during tunnel excavation, and the shield body 1 can be widened corresponding to the widening part tunnel, and an erector device not shown in the shield main body 1 Thus, a wide segment (covering body) S corresponding to the widened portion of the tunnel is assembled.
[0017]
That is, the shield body 1 includes a fixed cylinder 3 provided with a cutter head 2, a widened inner cylinder 4 that can move parallel to the fixed cylinder 3 in the widening direction, and the widened inner cylinder 4 with a shield axis O and The oscillating outer cylinder 5 is configured to oscillate around an oscillating pin 7 orthogonal to the widening direction. The widening inner cylinder 4 is translated in the widening direction at the time of widening transition and widening excavation. The body 5 can be inclined to correspond to the excavation surface.
[0018]
As shown in FIG. 2, the shield body 1 has a cylindrical outer shell 6 and a short arc outer shell 6a and a short arc outer shell 6a along a cutting line along the shield axis at an angle α exceeding 180 ° around the shield axis O. Divided into an arc outer shell 6b, the fixed cylinder 3 is provided on the long arc outer shell 6a side, and the widened inner cylinder 4 and the swinging outer cylinder 5 are provided on the short arc outer shell 6b side. And the wrap part 3a is formed in the both sides of the long circular arc outer shell 6a of the fixed cylinder 3, and the accommodation space part 3b is formed in the wrap part 3a. The widened inner cylinder 4 has slide members 4a extending in parallel to each other along the expansion / contraction direction on both sides of the arc frame 8, and support plates 5a on both sides of the swinging outer cylinder 5 extending in parallel to each other along the expansion / contraction direction. It is installed. The slide member 4a and the support plate 5a are swingably connected via the swing pin 7 and the pin hole 4b, and the slide member 4a and the support plate 5a are slidably fitted into the housing space 3b. Has been. A widening jack 11 is connected between the fixed drum 3 and the widening inner drum 4 in the accommodating space 3b, and a swinging jack 12 is connected between the widening inner drum 4 and the swinging outer drum 5. Yes.
[0019]
Further, fixed propulsion for moving the shield body 1 forward at the rear part of the fixed inner cylinder 3 and the rear part of the widened inner cylinder 4 by using the segment S assembled by an elector device (not shown) at the rear part of the shield body 1 as a reaction force receiver. Jack 13 and movable propulsion jack 14 are respectively arranged, and movable propulsion jack 14 is attached to movable support frame 15 which is movable within a predetermined range in the expansion / contraction direction at the rear part of widened inner cylinder 4 for propulsion adjustment. The jack 16 can move the movable propulsion jack 14 through the movable support frame 15 in the widening direction, and the pressing position can be adjusted corresponding to the front end face of the segment S to be widened.
[0020]
As shown in FIG. 5, the cutter head 2 provided at the front portion of the shield main body 1 is formed with a sediment intake 17 in the radial direction for each predetermined angle. A cutter bit 18 is attached. A pressure bulkhead 20 is provided at the front of the shield body 1 to support the face collapse earth pressure. The pressure bulkhead 20 is attached to the fixed body 3 and supports the cutter drive shaft 23 of the cutter head 2. The fixed partition wall 21 and the movable partition wall 22 provided at the front portion of the widened inner cylinder 4 and in sliding contact with the back surface of the fixed partition wall 21 are configured.
[0021]
As shown in FIG. 3, an outer peripheral rotary drum 27 is rotatably disposed around the shield axis O in a bearing support hole 24 formed in the fixed partition wall 21 through an outer peripheral bearing 25 and an outer peripheral seal material 26. An inner peripheral eccentric drum 33 is rotatably supported around the eccentric shaft center Oe through an eccentric side bearing 31 and an eccentric side seal member 32 in an eccentric hole 28 formed at an eccentric position on the outer peripheral rotating drum 27 from the shield axis O. Has been. The cutter driving shaft 23 is rotatably supported on the inner circumferential eccentric drum 33 by a bearing hole 34 formed at a position movable on the shield shaft O through an inner circumferential bearing 35 and an inner circumferential sealing material 36. Has been.
[0022]
The cutter drive shaft 23 is rotatably supported by a bearing box (bearing body) 41 via a main bearing 42 at the rear portion of the inner circumferential eccentric drum 33, and the bearing box 41 is supported by the fixed body 3 along the width-enlarging direction. A pair of widening guide rails 43 are slidably guided and supported by a rotary excavation reaction force. Further, a digging widening jack (excavation widening drive device) 44, which is a cutter widening movement device, is connected between the fixed barrel 3 and the bearing box 41, and the widening digging jack 44 is expanded and contracted during widening transition and widening excavation. Thus, a cutter widening movement device 45 that reciprocates the cutter driving shaft 23 in the widening direction via the bearing box 41 is configured, and the excavation width of the tunnel can be expanded.
[0023]
The bearing box 41 is provided with a cutter driving device 46 that rotationally drives the cutter head 2 via the cutter driving shaft 23, and the cutter driving device 46 is fixed to the rear end portion of the cutter driving shaft 23. A plurality of drive pinions 46b are engaged with the passive ring gear 46a, and the drive pinions 46b are rotationally driven by a cutter driving device (hydraulic or electric motor) 46c provided on the bearing box 41 via the mounting frame 47.
[0024]
In the above configuration, in the normal excavation unit, as shown in FIG. 7A, the cutter drive shaft 23 is fixed by the excavation widening jack 45 at a position on the shield axis O, and the cutter drive shaft 23 is cut by the cutter drive device 46. Then, the cutter head 2 is driven to rotate and a tunnel having a circular cross section is excavated.
[0025]
When entering the widening transition part from the normal excavation part, the cutter head 2 is rotationally driven by the cutter driving device 46 and the widening jack 44 for excavation is extended. Then, as shown in FIGS. 7A and 7B, the inner peripheral eccentric drum 33 is rotated at a predetermined speed in the direction of the arrow b around the eccentric shaft center Oe, and the outer peripheral rotary drum 27 moves the shield shaft center O. The cutter is rotated at a predetermined speed in the direction of arrow B at the center, the cutter drive shaft 23 is linearly moved in the widening direction, and the cutter head 2 is moved in the widening direction. Next, when the excavating widening jack 44 is contracted, the inner circumferential eccentric drum 33 is rotated at a predetermined speed in the reverse direction of the arrow b around the eccentric axis Oe, and the outer circumferential rotating drum 27 is centered on the shield axis O. The cutter is rotated in the reverse direction of the arrow B at a predetermined speed, the cutter drive shaft 23 is linearly moved in the contracted width direction, and the cutter head 2 is returned to the shield axis O. In this way, the expansion / contraction amount of the excavation widening jack 44 is sequentially increased, the stroke of the cutter head 2 is expanded, and the surplus excavation amount is increased.
[0026]
When a sufficient surplus amount is secured, the swinging outer cylinder 5 is tilted by the swinging jack 12 in the direction in which the front extends along the excavation taper surface, and the widening jack 11 swings through the widening inner cylinder 4. The moving outer cylinder 5 is moved in the widening direction and controlled to a posture along the tunnel excavation taper surface. In the shield main body 1, the segment S widened with the expansion of the shield main body 1 is assembled.
[0027]
When the widening portion is reached from the widening transition portion, as shown in FIG. 7C, the excavation widening jack 44 reciprocally rotates the inner peripheral eccentric drum 33 around the eccentric axis Oe within the maximum angle range β. The outer peripheral rotating drum 27 is reciprocated around the shield axis O within the maximum angle range γ, and the cutter head 2 is reciprocated within the range of the widening stroke W to excavate the widened portion. Further, the shield body 1 has the swing outer shell 5 returned in parallel with the shield axis O corresponding to the excavation plane of the widened tunnel, and the swing outer shell 5 is widened by the wide jack 11 via the wide inner shell 4. The state where 5 is expanded is maintained, and the excavation of the widened portion is continued.
[0028]
Excavation from the widened part to the normal excavated part via the reduced width transition part is performed in the reverse procedure.
According to the above embodiment, the cutter driving shaft 23 that is linearly reciprocated by the cutter widening movement device 45 is caused to follow the pressure partition wall 20 by the reciprocating rotation of the inner circumferential eccentric drum 33 and the outer circumferential rotating drum 27. Since all the sealing structure in the partition wall 20 is only the rotary sliding portion, and the sealing materials 26, 32, and 36 are interposed in these rotary sliding portions, respectively, the durability and reliability of the sealing structure of the pressure partition wall 20 are improved. be able to. Further, the widening range of the cutter head 2 can be secured sufficiently larger than that of the conventional copy cutter.
[0029]
Further, since the widening jack for excavation 44 for linearly reciprocating the bearing box 41 is provided, the movement control of the cutter head 2 in the widening direction can be easily performed only by controlling the amount of the widening jack for excavation 44. And a sufficient driving force in the widening direction can be easily obtained. Furthermore, since the excavation widening jack 44 supports the weight of the cutter head 2 and the excavation reaction force during the expansion / contraction movement, a large load is not applied to the outer peripheral rotating drum 27 and the inner peripheral eccentric drum 33, and a large strength is unnecessary. The structure can be simplified.
[0030]
Next, a second embodiment will be described with reference to FIG. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In this embodiment, in addition to the cutter widening moving device 45 of the first embodiment, an auxiliary outer peripheral drum driving device (auxiliary rotational driving device) 51 capable of rotating the outer peripheral rotating drum 27 and an inner peripheral eccentric drum 33 are provided. Is provided with an auxiliary eccentric drum driving device (auxiliary rotation driving device) 52 capable of rotating the motor.
[0031]
In other words, the auxiliary outer peripheral drum driving device 51 is attached to the auxiliary outer peripheral drum rotating device (hydraulic or electric motor) 54 provided on the fixed partition wall 21 by attaching an arc-shaped outer peripheral gear 53 to the rear portion of the outer peripheral rotating drum 27 along the circumferential direction. A rotationally driven drive pinion 55 is engaged with the outer peripheral gear 53.
[0032]
Further, the auxiliary eccentric drum driving device 52 has an arc-shaped eccentric gear 56 attached to the rear portion of the inner circumferential eccentric drum 33 along the circumferential direction, and an auxiliary eccentric drum rotating device (hydraulic or electric motor) 57 provided on the outer circumferential rotating drum 27. A drive pinion 58 that is rotationally driven is meshed with an eccentric gear 56.
[0033]
Further, a rotation detector (encoder) is attached to the auxiliary outer peripheral drum rotating device 54 and the auxiliary eccentric drum rotating device 57 to detect the rotational angle positions of the drums 27 and 33 from the number of rotations and feed back to the widening jack 44 for excavation. And is configured to control driving. Further, by locking the auxiliary outer peripheral drum rotating device 54 and the auxiliary eccentric drum rotating device 57, the cutter drive shaft 23 is fixed on the shield shaft O using the brake mechanism of each drum 27, 33, It is possible to excavate a tunnel having a circular section in the excavation part.
[0034]
According to the second embodiment, the auxiliary outer peripheral drum driving device 51 and the auxiliary eccentric drum driving device 52 apply a rotational force that can rotate the inner peripheral eccentric drum 33 and the outer peripheral rotating drum 27, respectively. The linear driving force received from the excavation widening jack 44 via the cutter driving shaft 23 can be reduced. Therefore, in particular, the load at the stroke end of the excavation widening jack 44 can be greatly reduced, and the cutter head 2 can be smoothly reciprocated in the expansion / contraction direction. Further, the rotational positions of the outer peripheral rotating drum 27 and the inner peripheral eccentric drum 33 can be easily detected using an encoder or the like provided in the auxiliary drum rotating devices 54 and 57. Furthermore, the outer peripheral rotating drum 27 and the inner peripheral eccentric drum 33 can be fixed by the brake mechanism of the auxiliary drum rotating devices 54 and 57 during normal excavation.
[0035]
Next, a third embodiment will be described with reference to FIG.
The cutter widening movement device 45 of the third embodiment is used for excavation, and the auxiliary outer peripheral drum drive device 51 and the auxiliary eccentric drum drive device 52 are used as auxiliary drives for the drums 27 and 33 in the second embodiment. The widening jack 44 is deleted, and the outer peripheral drum driving device 61 and the eccentric drum driving device 62 are configured to be the main drive. The same members as those in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted.
[0036]
That is, the outer peripheral drum rotating device 61 and the eccentric drum rotating device 62 are configured in the same manner as the auxiliary outer peripheral drum driving device 51 and the auxiliary eccentric drum driving device 52, although the entire constituent members are enlarged as the driving force increases. Therefore, the description is omitted. The bearing box 41 is supported by the widening guide rail 43 so as to be slidable in the widening direction, and the rotational reaction force of the cutter driving device 46 is supported.
[0037]
According to the third embodiment, the cutter drive shaft 23 is linearized via the outer peripheral rotating drum 27 and the inner peripheral eccentric drum 33 by the two rotational forces of the outer peripheral drum rotating device 61 and the eccentric drum rotating device 62. It can be reciprocated, the expansion range of the cutter head 2 can be secured sufficiently large, and the outer peripheral rotating drum 27, the inner peripheral eccentric drum 33, and the rotary sliding contact portion of the cutter driving shaft 23 can be easily sealed, By interposing the sealing materials 26, 32, and 36, durability and reliability of the sealing portion of the pressure partition 20 can be enhanced.
[0038]
【The invention's effect】
As described above, according to the first aspect of the present invention, the cutter driving shaft that is linearly reciprocated by the cutter widening movement device is caused to follow the reciprocating rotation of the inner circumferential eccentric drum and the outer circumferential rotating drum in the pressure bulkhead. The seal structure in the pressure bulkhead is a rotary sliding portion between the pressure bulkhead and the outer peripheral rotating drum, a rotational sliding portion between the outer peripheral rotating drum and the inner peripheral eccentric drum, and a rotational sliding portion between the inner peripheral eccentric drum and the cutter drive shaft. Compared to the sliding portion, it is possible to provide a highly durable and highly reliable seal structure, and it is possible to further improve the sealing performance of the pressure bulkhead seal structure. Further, the widening movement range of the cutter head can be increased.
[0039]
According to the second aspect of the present invention, it is possible to reliably seal the cutter drive shaft that linearly reciprocates in the widening direction by the sealing material, and the durability and reliability of the seal structure can be further improved. .
[0040]
Further, according to the invention described in claim 3, since the widening drive unit for excavation for linearly reciprocating the bearing body is provided, the movement control in the widening direction can be easily performed, and the widening driving force can be easily obtained. . Further, since the cutter head's own weight and excavation force are supported by the excavation widening drive device, the outer peripheral rotating drum and the inner peripheral eccentric drum do not require high strength, and the structure can be simplified.
[0041]
Furthermore, according to the invention described in claim 4, the force received from the cutter drive shaft can be reduced by applying a rotational force capable of rotating each drum by the auxiliary rotational drive device. The load at the stroke end of the drive device can be reduced, and the cutter head can be smoothly reciprocated in the expansion / contraction direction even if the excavation widening drive device is small. In addition, by using these auxiliary rotary drive devices, the rotational positions of the outer peripheral rotary drum and the inner peripheral eccentric drum can be detected, and the outer peripheral rotary drum and the inner peripheral eccentric drum are fixed by the auxiliary rotary drive device during normal excavation. Can do.
[0042]
Further, according to the invention of claim 5, the cutter driving shaft can be linearly reciprocated via the outer peripheral rotating drum and the inner peripheral eccentric drum by two rotational forces of the outer peripheral drum rotating device and the inner peripheral drum rotating device. In addition, it is possible to secure a sufficiently wide extension range of the cutter head, and it is possible to improve the durability and reliability of the seal portion of the pressure partition wall by the rotational sliding contact portion of the outer peripheral rotating drum and the inner peripheral eccentric drum.
[Brief description of the drawings]
FIG. 1 is a plan sectional view showing an embodiment of a widening shield machine according to the present invention.
FIG. 2 is an exploded perspective view showing a configuration of a shield body of the shield machine.
FIG. 3 is an enlarged view of a main part of FIG. 1;
FIG. 4 is a rear view of the shield machine.
FIG. 5 is a front view of the shield machine.
6 is a cross-sectional view taken along line AA shown in FIG.
FIGS. 7A to 7C show the operation of the pressure bulkhead during widening, FIG. 7A is a front view when starting widening, FIG. 7B is a partially enlarged front view of FIG. It is a front view at the time of widening.
FIG. 8 is a cross-sectional plan view when the shield machine is widened.
FIG. 9 is a front view when the shield machine is widened.
FIG. 10 is a cross-sectional view taken along the line AA when the shield machine is widened.
FIG. 11 is a rear view when the shield machine is widened.
FIG. 12 is an enlarged plan cross-sectional view of a main part showing a second embodiment of the shield machine according to the present invention.
FIG. 13 is a plan sectional view showing a third embodiment of the shield machine according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield body 2 Cutter head 3 Fixed cylinder 4 Widening inner cylinder 5 Oscillating outer cylinder 11 Widening jack 12 Oscillating jack 13 Fixed propulsion jack 14 Movable propulsion jack 20 Pressure bulkhead 21 Fixed bulkhead 22 Movable bulkhead 23 Cutter drive shaft 27 Outer peripheral rotating drum 33 Inner peripheral eccentric drum 41 Bearing box 43 Widening guide rail 44 Excavation widening jack 45 Cutter widening moving device 46 Cutter driving device 51 Auxiliary outer peripheral drum driving device 52 Auxiliary eccentric drum driving device 61 Outer peripheral drum driving device 62 Eccentric drum driving apparatus

Claims (5)

With the cutter head located at the front of the shield body via the cutter drive shaft, the tunnel width is expanded while the tunnel is being excavated, and a wide lining is carried out within the shield body widened to correspond to the tunnel width. In the widening shield machine that assembles the body,
Provide a pressure bulkhead to hold earth pressure at the front of the shield body,
An outer peripheral rotating drum that is rotatably disposed around the shield axis on the pressure bulkhead, and an inner peripheral eccentric drum that is rotatably supported by the outer peripheral rotating drum around an eccentric axis that is a predetermined distance away from the shield axis. The inner circumferential eccentric drum is provided with a bearing hole for rotatably supporting the cutter drive shaft, and each of these rotary sliding portions has a seal structure,
A widening type shield digging machine provided with a cutter widening moving device that rotationally drives the outer circumferential rotating drum and the inner circumferential eccentric drum to reciprocate the cutter driving shaft linearly in the widening direction from above the shielding shaft center. . 2. The sealing structure according to claim 1, wherein a sealing material is interposed between the pressure bulkhead and the outer peripheral rotating drum, between the outer peripheral rotating drum and the inner peripheral eccentric drum, and between the inner peripheral eccentric drum and the cutter drive shaft. Widening type shield machine. In the cutter widening movement device,
A bearing body disposed at the rear of the inner circumferential eccentric drum and rotatably supporting the cutter drive shaft;
Guide means for guiding the bearing body in the widening direction;
The widening type shield machine according to claim 1 or 2, further comprising a widening drive unit for excavation for linearly reciprocating the bearing body. 4. The widening type shield machine according to claim 3, wherein the cutter widening moving device is provided with an auxiliary rotational driving device capable of rotationally driving the outer peripheral rotating drum and the inner peripheral eccentric drum. 3. The widening device according to claim 1, wherein the cutter widening device comprises an outer peripheral drum rotating device that drives the outer peripheral rotating drum to reciprocate and an eccentric drum rotating device that drives the inner peripheral eccentric drum to reciprocate. Type shield machine.

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