JP4375675B2 - Shield machine - Google Patents

Description

  The present invention relates to a shield machine capable of excavating tunnels having various cross-sectional shapes.

  2. Description of the Related Art Conventionally, a shield machine includes an excavator body including a body, a plurality of shield jacks for propelling the excavator body, and an excavator that excavates a natural ground on the front end side of the excavator body. Generally, the body of the excavator main body is formed in a cylindrical shape, and the excavator is equipped with a plurality of cutter bits on the front surface of the cutter head having the same diameter as the body, and this cutter head is attached to the front end side portion of the excavator main body. It is supported rotatably around the central axis of the excavator body and is driven to rotate by a plurality of hydraulic motors to excavate a tunnel having a circular cross section.

  By the way, in recent years, a shield machine capable of excavating tunnels having various cross-sectional shapes such as a rectangular cross section and an oval cross section in addition to a circular cross section has been developed, and so far this type of shield machine has been put into practical use ( For example, see Patent Documents 1 to 3).

  In the shield machine of Patent Document 1, the disk cutter is supported by the machine body so as to be rotatable about the central axis of the machine, and the planetary cutter is supported by the disk body of the disk cutter so as to be rotatable. When the disk main body is rotationally driven by the plurality of hydraulic motors, the planetary cutter revolves integrally with the disk main body and rotates in synchronization with the rotation of the disk main body by the planetary gear mechanism. The contour shape of the planetary cutter is set in accordance with the ratio between the number of rotations of the planetary cutter and the number of revolutions so that a tunnel having a predetermined cross-sectional shape can be excavated.

  In the shield machine of Patent Document 2, four telescopic arms are connected to four radially extending spokes so as to be expandable and contractable in the radial direction by hydraulic jacks, and each corner arm and the corner cutter are hydraulically driven to rotate. A motor is installed.

  In the shield machine of Patent Document 3, a fixed gear is fixedly provided on a fixed shaft having an axis concentric with the central axis of the machine body, the planetary gear meshes with the fixed gear, and the planetary gear has the first gear. Meshed. A first casing is rotatably provided around a fixed shaft. A fixed gear, a planetary gear, and a first gear are accommodated in the first casing, and the planetary gear is rotatably supported by the first casing. The second casing protrudes forward from the front end portion of the first casing, the rear end portion of the hollow shaft portion of the second casing is rotatably fitted in the first casing, and the first gear is externally attached to the hollow shaft portion. It is fixed in a fitting shape.

  A shaft member is rotatably inserted into the hollow shaft portion of the second casing, a second gear is fixedly provided at the front end portion of the shaft member, and a third gear is engaged with the second gear. The hollow arm portion accommodates the second and third gears and is rotatably supported, and the third gear is fixedly provided with a cutter. The cutter is driven to rotate around the fixed shaft via the first and second casings by the casing drive motor, and in synchronization with this, the cutter is fixed, the planetary gear, the first gear, and the shaft member via the second casing. It is driven around. The ratio of the number of teeth of the fixed gear and the first gear is set so that a tunnel having a predetermined cross-sectional shape can be excavated. The cutter rotates and rotates independently through a shaft member, second and third gears, etc., by a cutter drive motor provided on the side of the machine body.

Japanese Patent No. 2898968 JP 2001-55890 A JP-A-9-119288

  In the shield machine of Patent Documents 1 to 3, tunnels having various cross-sectional shapes can be configured to be excavable. However, in order to excavate a tunnel having a predetermined cross-sectional shape, in the technique of Patent Document 1, the contour shape of the planetary cutter must be set according to the ratio of the rotation number and revolution number of the planetary cutter. In the third technique, the ratio of the number of teeth of the fixed gear and the first gear must be set. In other words, when excavating a tunnel having a cross-sectional shape other than the predetermined cross-sectional shape, the setting must be changed, but the setting change is very difficult, and naturally the cross-sectional shape of the tunnel being excavated is changed. It cannot be changed, and the versatility is extremely low.

  The shield machine of Patent Document 2 is equipped with a spoke-type cutter head, and the telescopic arm is connected to each spoke so that it can expand and contract in the radial direction. Since a large rotational resistance acts on the arm, there arises a problem in terms of strength and durability in the telescopic arm and the portion where the telescopic arm is connected to the spoke. For example, when this shield machine is applied as a shield machine for excavating ground including geology such as very hard rock, there is a high possibility that it will not be practically used.

  In the shield machine of Patent Document 3, in order to rotate the cutter around the fixed shaft and to rotate around the shaft member in synchronization with the cutter, the cutter is further provided on the side of the machine. In order to rotate independently by the motor, it has a very complicated structure including the first and second casings, the fixed gear, the planetary gear, the first to third gears, etc., which is disadvantageous in terms of manufacturing cost. In addition, since a very large force for rotating the cutter around the fixed shaft and rotating the cutter around the shaft member is input to the first and second casings and transmitted, In addition, there is a risk of problems in terms of durability.

  The purpose of the present invention is to be able to excavate tunnels of various cross-sectional shapes, can easily change the cross-sectional shape of the tunnel to be excavated, is extremely versatile, can simplify the structure, has high excavation capability, strength It is to provide a shield machine that is excellent in terms of durability and durability, and can cope with excavation of natural ground including all kinds of soil.

The shield machine according to claim 1 includes a machine body including a fuselage, a plurality of shield jacks for propelling the machine body, and excavation means for excavating a natural ground on a front end side of the machine body. A first rotating member rotatably supported around a first axis parallel to the central axis of the excavator main body at a front end side portion of the excavator main body, and a first rotating the first rotating member. A rotation drive means; a second rotation member supported by the first rotation member so as to be rotatable around a second axis that is parallel to the first axis and spaced apart from the first axis; Second rotation driving means for rotating the second rotation member relative to the first rotation member independently of the first rotation driving means; and the second rotation member parallel to the second axis and the second rotation member. Rotatably supported around a third axis that is spaced from the axis. A rotatable cutter equipped with a plurality of cutter bits or roller cutter on the surface, first the rotatable cutter with respect to the second rotary member and the second rotary drive means comprising a hydraulic motor for rotating independently, 3rd rotation drive means which has a hydraulic motor built in the 2nd rotation member, and the rotary cutter was constituted so that excavation of the front ground near the central axis of an excavator main body was possible, To do.

  In this shield machine, the machine body including the fuselage is propelled by a plurality of shield jacks, and the ground at the front end side of the machine body is excavated by the excavating means. As the excavating means, the first rotating member, the second rotation A member, a rotary cutter, and first to third rotation driving means are provided. A first rotating member is supported on the front end portion of the excavator main body so as to be rotatable about the first axis, and a second rotating member is supported on the first rotating member so as to be rotatable about the second axis. A rotary cutter is supported by the two-rotating member so as to be rotatable around the third axis. The first axis is parallel to the central axis of the machine body, the second axis is parallel to the first axis and spaced from the first axis, and the third axis is parallel to the second axis. And at a position separated from the second axis.

  The first rotating member is driven to rotate about the first axis by the first rotation driving means, and the second rotating member and the rotary cutter are also rotated about the first axis integrally, and the second rotating driving means. As a result, the second rotating member is driven to rotate about the second axis relative to the first rotating member, and the rotary cutter also rotates about the second axis integrally. The cutter is driven to rotate about the third axis with respect to the second rotating member, and the first to third rotating driving units independently drive the first rotating member, the second rotating member, and the rotary cutter. .

  The distance between the first axis and the second axis is R, the distance between the second axis and the third axis is r (<R), and the excavation radius of the rotary cutter centering on the third axis is e. , In the front view, the movement locus of the second axis is the circumference of the radius R centered on the first axis, and the movement locus of the third axis is a radius centered on the second axis. The excavable range that can be excavated by a rotary cutter with a circumference of r is a circle with a radius (R + r + e) centered on the first axis when R ≦ (r + e), and R> (r + e) In this case, a ring-shaped portion is formed between a circumference having a radius (R− (r + e)) centered on the first axis and a circumference having a radius (R + r + e).

  Since the first and second rotary drive means independently drive the first and second rotary members, respectively, the rotary cutter can be freely moved within the excavable range by controlling these first and second rotary drive means. By moving, the distance from the first axis to the inner surface of the tunnel is changed to a free distance greater than or equal to a predetermined distance that is the maximum (R + r + e), and tunnels with various free cross-sectional shapes can be excavated.

In the invention of claim 1, the following configuration can be adopted.
The excavator main body has a chamber capable of collecting excavated soil and a partition partitioning the rear end of the chamber, and the first rotating member is a rotating drum having a plate member constituting a part of the partition. (Claim 2). Alternatively, the first rotating member includes a rotating member that is disposed on the front side of the partition wall and includes one or a plurality of spokes extending radially.

The first rotation driving means has a plurality of first actuators attached to an excavator main body, and the second rotation driving means has a plurality of second actuators attached to a first rotation member, The third rotation driving means includes a plurality of the hydraulic motors attached to the second rotation member. The first to third actuators are preferably first to third hydraulic motors. The second rotating member includes a cutter support frame that is rotatably supported in the vicinity of the outer peripheral portion of the first rotating member, and the second rotating member and the rotary cutter have a rotary cutter that rotates first in a front view. It is configured to be movable outward from the outer periphery of the member.

  The rotary cutter has a circular front surface and a cylindrical outer peripheral surface connected to the outer periphery of the front surface, and a plurality of cutter bits or roller cutters are provided on the front surface and the cylindrical outer peripheral surface. Alternatively, the rotary cutter has a circular front surface, an annular tapered surface connected to the outer periphery of the front surface, and a cylindrical outer peripheral surface connected to the rear end of the annular tapered surface, and the front surface, the annular tapered surface, and the cylindrical outer periphery. Equipped with multiple cutter bits or roller cutters on the surface.

A plurality of rotary cutters rotatably supported around a plurality of different third axes on the second rotary member, and a plurality of hydraulic motors that respectively rotate and drive the plurality of rotary cutters ( Claim 5). A plurality of second rotation members supported by the first rotation member so as to be rotatable around a plurality of different second axes, and a plurality of second rotation driving means for rotating the plurality of second rotation members, respectively. (Claim 6). Drive control means for drivingly controlling the first to third rotation drive means, wherein the drive control means is associated with the rotation phase angle from the reference phase angle of the first rotation member according to the cross-sectional shape of the tunnel to be excavated. Then, the first and second rotation driving means are controlled so as to control the rotation angle of the second rotating member.

  A plurality of cutter bits supported on the surface of the first rotating member so as to be rotatable around a fourth axis that is parallel to the first axis and spaced apart from the first axis and the second axis. Alternatively, a rotary auxiliary cutter equipped with a roller cutter, and a fourth rotation driving means for rotating the rotary auxiliary cutter are provided. The second axis of the second rotating member and the fourth axis of the rotary auxiliary cutter are set to be symmetrical with respect to the first axis of the first rotating member. A stirring blade disposed inside the chamber and rotatably supported by a first rotating member, and a stirring blade rotation driving unit that rotationally drives the stirring blade.

  The rotary cutter has a cutter frame for attaching a cutter bit or a roller cutter, and an operator enters the inside of the cutter frame from the partition side to form a work space in which the cutter bit or the roller cutter can be replaced. A muddy material supply means for supplying a muddy material to the rotary cutter and spraying it to the front of the rotary cutter is provided. A mud material supply means is provided for supplying the mud material to the stirring blade and spraying it to the front of the stirring blade.

According to the shield machine of Claim 1, the 1st rotation member and the 1st rotation member which were supported by the front end side part of an excavation machine main body so that rotation was possible around the 1st axis parallel to the central axis of an excavation machine main body. First rotation driving means for rotationally driving, a second rotating member supported by the first rotating member so as to be rotatable around a second axis parallel to the first axis and spaced from the first axis, A second rotary driving means for driving the second rotary member to rotate independently of the first rotary drive means with respect to the first rotary member; the second rotary member is parallel to the second axis and spaced from the second axis; A rotary cutter that is supported rotatably around a third axis at a position and is equipped with a plurality of cutter bits or roller cutters on the surface, and a rotary cutter with respect to the second rotary member. for rotating independently from the a hydraulic motor, it is built in the second rotating member And a third rotary drive means having a hydraulic motor, a rotary cutter has been excavation constructed in front of the natural ground in the vicinity of the central axis the shield machine main body.

  Accordingly, tunnels having various free cross-sectional shapes can be excavated, and when excavating a tunnel having a predetermined cross-sectional shape, the rotational phase angle from the reference phase angle of the first rotating member is set according to the cross-sectional shape. This can be realized by controlling the driving of the first and second rotation driving means so as to control the rotation angle of the second rotating member in association with each other. That is, by changing the control of the first and second rotation driving means, the cross-sectional shape of the tunnel to be excavated can be easily changed without changing the mechanical structure, and the cross-section of the tunnel being excavated It is also possible to change the shape, and the versatility becomes extremely high. Even if it is necessary to dug the ground to slightly enlarge the tunnel, such as when excavating the curved part of the tunnel, the dug can be done with a rotary cutter and the existing copy cutter should be omitted Is possible.

  In addition, since the first and second rotary members and the rotary cutter are independently driven to rotate by the first to third rotary drive means, a complicated structure for interlocking and connecting the first and second rotary members and the rotary cutter is unnecessary. This simplifies the structure and is advantageous in terms of manufacturing cost. Further, the rotary cutter is substantially placed around the first axis, the second axis, and the third axis. It is possible to rotate, and the trajectory of the rotary cutter can be set to a trajectory that can be excavated efficiently, so the excavation capability becomes very high, and it should be configured with excellent strength and durability Therefore, it becomes possible to cope with excavation of natural ground including any soil.

  According to the shield machine of claim 2, the machine has a chamber capable of collecting excavated soil and a partition wall that partitions the rear end of the chamber, and the first rotating member constitutes a part of the partition wall. Therefore, the strength and rigidity of the first rotating member in the rotating direction are very high, and the strength and durability are very excellent.

According to the shield machine of claim 3, the first rotation drive means has a plurality of first actuators attached to the main body of the excavator, and the second rotation drive means has a plurality of attachments attached to the first rotation member. The third rotation driving means has a plurality of the hydraulic motors attached to the second rotation member, so that the first rotation member, the second rotation member, and the rotary cutter can be independently and reliably secured. And the structure of the first to third rotation driving means can be simplified.

  According to the shield machine of claim 4, the second rotating member is composed of a cutter support frame that is rotatably supported near the outer periphery of the first rotating member, and the second rotating member and the rotary cutter are viewed from the front. Since the rotary cutter is configured to be movable outward from the outer periphery of the first rotating member, tunnels having various cross-sectional shapes larger in size than the first rotating member can be reliably excavated.

According to the shield machine of claim 5, a plurality of rotary cutters rotatably supported around a plurality of different third axes by the second rotary member, and the plurality of rotary cutters are driven to rotate. Since the plurality of hydraulic motors are provided, excavation capability can be increased.

  According to the shield machine of the sixth aspect, the plurality of second rotating members that are rotatably supported around the plurality of different second axes by the first rotating member, and the plurality of second rotating members, respectively. Since a plurality of second rotational drive means for rotational driving are provided, excavation capability can be enhanced.

  According to the shield machine of the seventh aspect, the drive control means for driving and controlling the first to third rotation drive means is provided, and the drive control means has a reference phase of the first rotation member according to the cross-sectional shape of the tunnel to be excavated. Since the first and second rotation driving means are controlled so as to control the rotation angle of the second rotation member in association with the rotation phase angle from the angle, the tunnel having a predetermined cross-sectional shape can be reliably excavated and excavated. The cross-sectional shape of the tunnel can be easily changed.

  According to the shield machine of claim 8, the first rotating member rotates around the fourth axis that is parallel to the first axis and spaced apart from the first axis and the second axis. Since the rotary auxiliary cutter equipped with a plurality of cutter bits or roller cutters supported on the surface and the fourth rotary drive means for rotationally driving the rotary auxiliary cutter are provided, the excavation capability is improved and the rotary cutter is used. A portion that cannot be excavated can be configured to be excavated by this rotary auxiliary cutter.

  According to the shield machine of the ninth aspect, since the agitating blade disposed inside the chamber and rotatably supported by the first rotating member, and the agitating blade rotation driving means for rotationally driving the agitating blade, excavation is performed. The soil can be easily stirred and conveyed from the chamber to the outside. The stirring blades are rotated by the stirring blade rotation driving means and rotate integrally with the first rotating member, so that the stirring performance is greatly improved. .

  The shield machine of the present invention includes an excavator body including a fuselage, a plurality of shield jacks for propelling the excavator body, and a drilling device that excavates a natural ground on the front end side of the machine. As the excavator, a first rotating member supported on a front end side portion of the excavator main body so as to be rotatable around a first axis parallel to the central axis of the excavator main body, and the first rotating member are driven to rotate. And a second rotation supported by the first rotation member so as to be rotatable around a second axis that is parallel to the first axis and spaced apart from the first axis. A member, a second rotation driving means for rotating the second rotation member with respect to the first rotation member independently of the first rotation driving means, and the second rotation member parallel to the second axis and This is supported so as to be rotatable around a third axis that is spaced from the second axis. And a rotary cutter equipped with a plurality of cutter bits on its surface, and a third rotary drive means for driving the rotary cutter to rotate independently of the first and second rotary drive means with respect to the second rotary member. ing.

  As shown in FIGS. 1 to 3, the shield machine 1 includes an excavator body 2 including a body 10, a plurality of shield jacks 3 for propelling the machine body 2, a front body 11 and a rear body 12 of the body 10. And a pair of left and right screw conveyors 6 a for discharging the excavated soil excavated by the excavator 5. A pair of left and right erector devices 7 that assemble the segment S on the inner surface of the tunnel T excavated by the digging device 5, and a pair of left and right holding the segment S that is assembled on the inner surface of the tunnel T. A segment holding device 8 and a back-injecting device 9 for injecting mortar between the inner surface of the tunnel T and the segment S assembled on the inner surface are provided.

  The body 10 of the excavator main body 2 has a front cylinder 11 and a rear cylinder 12, and the rear end portion of the front cylinder 11 and the front end portion of the rear cylinder 12 are connected to each other through a middle folding portion 13 so as to be able to be folded. . The front cylinder 11 and the rear cylinder 12 are each formed in a rectangular tube shape having a substantially vertical cross-section with a ratio of up / down length to left / right length of about 1: 2, and its upper wall, left and right side walls, lower wall, A corner portion with the side wall is formed in a curved shape. The length of the front cylinder 11 is about twice the length of the rear cylinder 11, and an annular partial spherical seat 14 is formed at the front end portion of the rear cylinder 12 in the middle bent portion 13. A rear end portion of the body 11 is fitted outside, and an annular seal member 15 is mounted between the fitting portions of the front body 11 and the rear body 12.

  The front cylinder 11 is formed so that its front and rear length is about 1.5 times the vertical length, and the front cylinder 11 has a vertical partition wall in a length portion of about 1/3 of the front cylinder 11 from the front end to the rear. 16 is provided. The partition wall 16 includes a fixed partition wall 17 whose outer peripheral portion is fixed to the inner surface of the front barrel 11 and a disk-shaped movable partition wall 18 rotatably fitted in the fixed partition wall 17. The movable partition wall 18 has a diameter thereof. Is formed to be slightly shorter than the vertical length of the inner cylinder 11. A chamber 19 that collects excavated soil excavated by the excavator 5 is formed at the partition wall 16 and a portion of the front body 11 that projects forward from the partition wall 16. The partition wall 16 partitions the rear end of the chamber 19.

  An annular member 20 having a cylindrical portion 21 is fixed to the inner surface of the front cylinder 11 from the partition wall 16 to the rear of the front cylinder 11 at about １ ／ length, and is fixed by a plate member at the front end of the annular member 20. A partition wall 17 is formed. A rotary drum 40 of the excavator 5 is rotatably supported on the cylindrical portion 21 of the annular member 20, and the movable partition wall 18 is formed by a plate member 41 at the front end of the rotary drum 40. In the vicinity of the rear end of the fixed bulkhead 17 of the front barrel 11, a pair of left and right ground exploration devices 22a are movably provided at the upper end, and a pair of left and right movable sleds 2b are movably provided at the lower end. 22b is for preventing the body 10 from rolling and holding the body 10 in an intended posture.

  The fixed partition wall 17 is provided with a pair of left and right manlocks 23 and a pair of left and right manholes 24, a pair of left and right earth discharge ports 25 is formed, six earth pressure gauges 26 are provided, and six mudgings are provided. A material inlet 27 is formed. The manlock 24 has a function of partitioning the entrance / exit space from the interior of the excavator body 2 and increasing the pressure close to the pressure in the chamber 19. The movable partition wall 18 is provided with a pair of manholes 28, and four mud additive inlets 29 are formed.

  The rear cylinder 12 is formed so that the longitudinal length thereof is about ½ of the vertical length. On the inner surface of the rear cylinder 12, a ring web 30 is fixed to the front end portion, and a tail seal 31 is attached to the rear end portion. Is provided. The plurality of shield jacks 3 are disposed rearwardly at appropriate intervals (substantially equal intervals) in the circumferential direction along the inner surface of the rear barrel portion of the front barrel 11 and the front end portion of the rear barrel 12. The rear portion of the jack body of each shield jack 3 is fixed to the ring web 30 in a penetrating manner. The plurality of shield jacks 3 generate a propulsive force by a reaction force that pushes the segment S assembled by the erector device 8 backward.

  The plurality of middle-folded jacks 4 are spaced at appropriate intervals (substantially equidistant) in the circumferential direction along the inner surface of the front barrel 11 and the front end of the rear barrel 12 (the middle folded portion 13). In addition, it is arranged in the forward direction so as not to interfere with the plurality of shield jacks 3, and the front end portion of each middle folding jack 4 is rotatably connected to a bracket 32 fixed to the front body 11, and each middle folding A rear end portion of the jack 4 is rotatably connected to a bracket 33 fixed to the rear trunk 12.

Next, the excavator 5 will be described in detail.
As shown in FIGS. 1 to 5, the excavator 5 includes a rotary drum 40 corresponding to a first rotating member that is supported on the front end side portion of the excavator main body 2 so as to be rotatable around the first axis A1; A first rotation drive mechanism 45 for rotating the rotary drum 40; a cutter support frame 50 corresponding to a second rotary member rotatably supported around the second axis A2 by the rotary drum 40; and a cutter support frame 50 And a plurality of cutter bits 61 on the surface, which are supported by the cutter support frame 50 so as to be rotatable around a different pair of third axes A3. The pair of rotary cutters 60, the pair of third rotary drive mechanisms 65 for rotating the pair of rotary cutters 60 with respect to the cutter support frame 50, and the fourth axis A4 on the rotary drum 40. A rotary auxiliary cutter 70 that is supported so as to be rotatable around and has a plurality of cutter bits 71 on its surface, a fourth rotary drive mechanism 75 that drives the rotary auxiliary cutter 70 to rotate with respect to the rotary drum 40, and the rotary drum 40 A pair of stirring blades 80 rotatably supported around a pair of different fifth axes A5 and a pair of stirring blades that respectively rotate and drive the pair of stirring blades 80 relative to the rotary drum 40. A fifth rotation drive mechanism 85 corresponding to the rotation drive means, a drive control unit 90 including a hydraulic circuit for driving and controlling the first to fifth rotation drive mechanisms 45, 55, 65, 75, 85; An operation panel 95 for operating the rotation drive mechanisms 45, 55, 65, 75, 85 is provided.

  The first axis A1 coincides with (is parallel to) the central axis Ac of the excavator body 2, and the second axis A2 is parallel to the first axis A1 and spaced from the first axis A1, The triaxial center A3 is parallel to the second axial center A2 and spaced from the second axial center A2, and the fourth axial center A4 is parallel to the first axial center A1 and the first and second axial centers A1, A1. The fifth axial center A5 is parallel to the first axial center A1 and is spaced apart from the first, second, and fourth axial centers A1, A2, A4. The rotation drive mechanisms 45, 55, 65, 75, and 85 are configured to independently rotate and drive the rotary drum 40, the cutter support frame 50, the rotary cutter 60, the rotary auxiliary cutter 70, and the stirring blade 80, respectively. .

  For example, the second axis A2 is located at a distance of about ¾ of the radius of the rotary drum 40 from the first axis A1, and the pair of third axes A3 are symmetrical with respect to the second axis A2. The fourth axial center A4 is symmetrical to the second axial center A2 with respect to the first axial center A1. The pair of fifth axes A5 is located at a distance of about 3/4 of the radius of the rotary drum 40 from the first axis A1, and the pair of fifth axes A5 are arranged around the first axis A1 in the circumferential direction. It is in a position moved about 45 degrees to both sides.

  As described above, the rotary drum 40 has the plate member 41 constituting the movable partition wall 18 which is a part of the partition wall 16 on the front surface. The rotating drum 40 has a plate member 41, an outer cylinder 42, and a plurality of ribs. The outer cylinder 42 is fitted into the cylindrical portion 21 of the annular member 20 and is rotatably supported. The cylindrical portion 21 and the outer cylinder 42 are supported. An annular seal member 43 is mounted between them, and a ring gear 44 is fixedly provided at the rear end portion of the outer cylinder 42. The first rotation drive mechanism 45 includes first hydraulic motors 46 corresponding to a plurality of (for example, eight) first actuators attached to the excavator main body 2. The plurality of first hydraulic motors 46 are forwardly mounted at appropriate intervals in the circumferential direction on a ring-shaped motor mounting portion 47 provided at the rear end portion of the annular member 20, and these output gears mesh with the ring gear 44. is doing.

  The cutter support frame 50 is rotatably supported in the vicinity of the outer peripheral portion of the rotary drum 40, and the pair of rotary cutters 60 and the cutter support frame 50 are paired with the rotary cutter 60 in the front view. It is configured to be movable outward from the outer periphery. The cutter support frame 50 includes a frame main body 51 disposed in the chamber 19 on the front side of the rotary drum 40 and a cylindrical portion 52 that is connected to the central portion in the length direction of the rear end portion of the frame main body 51 and protrudes rearward. And have. The frame main body 51 is formed in a box shape whose length is about 4/5 of the diameter of the rotating drum 40, and its front and rear thickness is slightly smaller than the front and rear length of the chamber 19. A pair of rotary cutters 60 are attached to both sides in the longitudinal direction.

  A cylindrical receiving portion 40a is fixed to the rotating drum 40 in the vicinity of the outer periphery, and the cylindrical portion 52 of the cutter support frame 50 is fitted into the cylindrical receiving portion 40a so as to be rotatably supported. An annular seal member 53 is mounted between the receiving portion 40 a and the tubular portion 52, and a ring gear 54 is fixedly provided at the rear end portion of the tubular portion 52. The second rotation drive mechanism 55 includes second hydraulic motors 56 corresponding to a plurality of (for example, eight) second actuators attached to the rotary drum 40. The plurality of second hydraulic motors 56 are mounted on a predetermined motor mounting portion in the circumferential direction so as to face forward at appropriate intervals, and these output gears mesh with the ring gear 54.

  The pair of rotary cutters 60 includes a cutter frame 62 having a circular front surface 62a, an annular tapered surface 62b continuous with the outer periphery of the front surface 62a, and a cylindrical outer peripheral surface 62c continuous with the rear end of the annular tapered surface 62b. A plurality of cutter bits 61 are provided on the front surface 62 a, the annular tapered surface 62 b, and the cylindrical outer peripheral surface 62 c, and the cutter bits 61 are detachable from the inside of the cutter frame 62. A pair of cutter mounting portions 51a is provided on both sides in the length direction of the frame body 51, and the rear end portion of the cutter frame 62 of each rotary cutter 60 is fitted into each cutter mounting portion 51a from the front side so as to be rotatable. An annular seal member 63 is mounted between the cutter attachment portion 51 a and the cutter frame 62, and a ring gear 64 is fixedly provided at the rear end portion of the cutter frame 62.

  The pair of third rotation drive mechanisms 65 includes third hydraulic motors 66 corresponding to a plurality of (for example, one pair) third actuators attached to the pair of cutter attachment portions 51a. In each third rotation drive mechanism 65, the plurality of third hydraulic motors 66 are mounted forward in the cutter attachment portion 51 a, and these output gears mesh with the ring gear 64 of the rotary cutter 60. Here, a working space is formed inside the cutter frame 62 where an operator can enter the cutter frame 61 from the partition 16 side through the cutter support frame 50 and the cutter bit 61 can be replaced. A hatch 50 a that enters the cutter support frame 50 is formed at the rear end of the cylindrical portion 52 of the cutter support frame 50. The cutter frame 62 is also equipped with a stirring blade that protrudes rearward.

  The rotary auxiliary cutter 70 has the same structure as the rotary cutter 60, and has a circular front surface 72a, an annular tapered surface 72b continuous to the outer periphery of the front surface 72a, and a cylindrical outer peripheral surface 72c continuous to the rear end of the annular tapered surface 72b. A plurality of cutter bits 71 are provided on the front surface 72a, the annular tapered surface 72b, and the cylindrical outer peripheral surface 72c, and the cutter bits 71 are detachable from the inside of the cutter frame 72. Yes. A cylindrical cutter mounting portion 50A protruding into the chamber 19 is fixed to the rotating drum 40, and the rear end portion of the cutter frame 72 of the rotary auxiliary cutter 70 is fitted into the cutter mounting portion 50A from the front side and is rotatable. An annular seal member 73 is mounted between the cutter attachment portion 50A and the cutter frame 72, and a ring gear 74 is fixedly provided at the rear end portion of the cutter frame 72.

  The fourth rotation drive mechanism 75 includes a plurality (for example, a pair) of fourth hydraulic motors 76 attached to the cutter attachment portion 50A. The plurality of fourth hydraulic motors 76 are mounted forward inside the cutter attachment portion 50 </ b> A, and these output gears mesh with the ring gear 74. Here, a working space is formed in the cutter frame 72 so that an operator can enter the cutter mounting portion 50A from the partition wall 16 side and exchange the cutter bit 71. The cutter frame 72 is also equipped with a stirring blade that protrudes rearward.

  The pair of stirring blades 80 is disposed inside the chamber 19, and the pair of fifth rotation drive mechanisms 85 are a plurality of (for example, three) fifth rollers respectively attached to the rotary drum 40 on the rear side of the partition wall 16. A hydraulic motor 85 is included.

  Incidentally, a rotary joint 91 is mounted at the center of the rotary drum 40, and the second to fifth hydraulic motors 56, 66, 76, 86 of the second to fifth rotary drive mechanisms 55, 65, 75, 85 are driven. Hydraulic pressure is supplied from the control unit 90 via the rotary joint 91. Here, in the case of the present embodiment, the cutter support frame 50 does not rotate 180 degrees or more from the predetermined reference phase angle position with respect to the rotary drum 40, so that the hydraulic pressure to the third hydraulic motor 76 of the third rotation drive mechanism 75 is increased. Is supplied from the rotary joint 91 by a hydraulic hose. However, a rotary joint may be attached to the center portion of the cutter support frame 50, and the hydraulic pressure may be supplied to the third hydraulic motor 76 via the rotary joint.

  Further, a mud material supply unit (not shown) is provided, and the mud material is supplied to the rotary joint 91 from this mud material supply unit. A pair of rotary cutters 60 is provided with a mud additive inlet 60a, a rotary auxiliary cutter 70 is provided with a mud additive inlet 70a, and a rotary joint 91 is added to the mud additive inlets 60a and 70a. A mud material is supplied by a mud material hose (not shown). A pair of stirring blades 80 is formed with a mud filler inlet 80a, and a rotary joint 92 is attached to the center of the stirring blades 80. The rotary joint 91 is connected to the rotary joint 92 by a mud material hose (not shown). The mud material is supplied, and the mud material is supplied from the rotary joint 92 to the mud material inlet 80a.

  Since the excavated soil discharging device 6, the pair of erector devices 7, the pair of segment holding devices 8, and the back-injecting device 9 are existing devices, detailed description thereof is omitted. An intermediate pillar Sa that supports the segment S attached to the upper part of the inner surface of the tunnel T is attached to the center in the width direction of the tunnel T. The intermediate pillar Sa is attached to one of the pair of erector devices 7. Done in

Next, the operation of the shield machine 1 will be described.
In the shield machine 1, the machine 2 is propelled by a plurality of shield jacks 3, the ground on the front end side of the machine 2 is excavated by the excavator 5, and the excavated soil is collected in the chamber 19 and discharged. It is discharged to the outside by the device 6. In this way, the tunnel T is excavated, and a plurality of segments S are sequentially assembled in a ring shape by a pair of erector devices 7, and the segments S are held by a pair of segment holding devices 8. The middle pole Sa is assembled by the erector device 7.

  In the excavator 5, the rotary drum 40 is rotated around the first axis A1 by the first rotation drive mechanism 45, and the cutter support frame 50, the pair of rotary cutters 60, and the rotary auxiliary cutter 70 are also integrated. The cutter support frame 50 is rotated about the second axis A2 with respect to the rotary drum 40 by the second rotation driving mechanism 55, and the pair of rotary cutters 70 is rotated. Also rotate around the second axis A2, and the pair of third rotary drive mechanisms 65 makes the pair of rotary cutters 60 different from the cutter support frame 50, respectively. The rotary auxiliary cutter 70 is rotationally driven around the fourth axis A4 with respect to the rotary drum 40 by the fourth rotational drive mechanism 75, and is paired by the pair of fifth rotational drive mechanisms 85. Stirring Roots 80 are driven respectively rotate with respect to the rotary drum 40.

  The first to fifth rotation drive mechanisms 45, 55, 65, 75, 85 independently drive the rotary drum 40, the cutter support frame 50, the rotary cutter 60, the rotary auxiliary cutter 70, and the stirring blade 80, respectively. Regarding the control of the first to fifth rotary drive mechanisms 45, 55, 65, 75, and 85 by the drive control unit 90 in order to excavate the tunnel T having the same rectangular shape as that of the fuselage 2, FIGS. 16 will be described in detail. The left side in the front view is the left side, and among the pair of rotary cutters 60, the right side in FIG. 6-1 is the No. 1 cutter 60, the left side is the No. 2 cutter 60, and the rotary auxiliary cutter 70 is No. This will be described as 3 cutter 70.

  First, when the excavator 5 is in the state shown in FIG. 6A, the drum rotation angle θ (rotation phase angle θ) of the rotary drum 40 centered on the first axis A1 with respect to the excavator main body 2 is set to the reference phase angle 0. The cutter support frame 50 centered on the second axis A2 with respect to the rotary drum 40, with the drum rotation angle θ in the clockwise direction of the rotary drum 40 as viewed from the front from this reference phase angle. The frame rocking angle α (rotational phase angle α) is a reference phase angle of 0 degree, and the frame rocking angle α in the counterclockwise direction of the cutter support frame 50 from the reference phase angle is set to the + side.

  Here, in the state of FIG. 6A, the second axis A is located at the upper limit position, the cutter support frame 50 is horizontal, and the vertical position of the pair of third axes A3 coincides. The upper and lower positions of the upper ends of the No. 1 and No. 2 cutters 60 and the upper end of the fuselage 2 coincide, and the fourth axis A4 is located at the lower limit position. The lower end of the No. 3 cutter 70 and the fuselage The vertical position of the lower end of 2 matches.

  Now, during excavation, in the third to fifth rotation drive mechanisms 65, 75, 85, the No. 1, No. 2 cutter 60, No. 3 cutter 70, and the stirring blade 80 are always clockwise when viewed from the front. In the first and second rotational drive mechanisms 45 and 55, the cutter support frame 50 of the cutter support frame 50 is associated with the drum rotation angle θ from the reference phase angle of the rotary drum 40 according to the cross-sectional shape of the tunnel T to be excavated. The first and second rotation drive mechanisms 45 and 55 are controlled so as to control the frame swing angle α.

  More specifically, first, as shown in FIGS. 6-1 to 6-4, the rotating drum is formed so that the inner surface of the circumferential portion of the upper right about 1/4 of the tunnel T is formed by the No. 1 cutter 60. 40 rotates at a drum rotation angle θ = 0 → 30 → 60 → 73.7 degrees, and during that time, the cutter support frame 50 has a frame swing angle α = ± 0 → + 36.4 → + 74.3 → + 52.8 degrees. Rocks. In the state of FIG. 6-4, the No. 1 cutter 60 is located at the center in the vertical direction on the right side surface of the tunnel T. Next, as shown in FIGS. 6-4 to 6-6, the rotary drum 40 has a drum rotation angle θ = 73... So that the No. 2 cutter 60 is positioned in the vertical center of the right side surface of the tunnel T. The cutter support frame 50 swings from 7 → 90 → 106.3 degrees, and during that time, the cutter support frame 50 swings at a frame swing angle α = + 52.8 → ± 0 → −52.8 degrees.

  Next, as shown in FIGS. 6-6 to 6-9, the rotating drum 40 is rotated by the No. 2 cutter 60 so that the inner surface of the circumferential portion of the lower right side of the tunnel T is about 1/4. The angle θ = 106.3 → 120 → 150 → 180 degrees, and during that time, the cutter support frame 50 is changed to a frame swing angle α = −52.8 → −74.3 → −36.4 → ± 0 degrees. Swing. 6-9, the second axis A is positioned at the lower limit position, the cutter support frame 50 is horizontal, and the vertical position of the pair of third axes A3 coincides with each other. 1, the vertical position of the lower end of the No. 2 cutter 60 and the lower end of the fuselage 2 coincide, and the fourth axis A4 is located at the upper limit position, and the upper end of the No. 3 cutter 70 and the fuselage 2 The vertical position of the upper end matches.

  Next, as shown in FIGS. 6-9 to 6-12, the rotary drum 40 is rotated at the drum rotation angle so that the inner surface of the lower left about 1/4 of the tunnel T is formed by the No. 1 cutter 60. θ = 180 → 210 → 240 → 253.7 degrees, while the cutter support frame 50 swings at a frame swing angle α = ± 0 → + 36.4 → + 74.3 → + 52.8 degrees. In the state of FIGS. 6-12, the No. 1 cutter 60 is located in the vertical center of the left side surface of the tunnel T. Next, as shown in FIGS. 6-12 to 6-14, the rotary drum 40 has a drum rotation angle θ = 253.m so that the No. 2 cutter 60 is positioned at the center in the vertical direction on the left side surface of the tunnel T. 7 → 270 → 286.3 degrees, and the cutter support frame 50 swings at a frame swing angle α = + 52.8 → ± 0 → −52.8 degrees.

  Next, as shown in FIG. 6-14 to FIG. 6-16 and FIG. 6-1, the rotating drum is formed so that the inner surface of the peripheral portion of the upper left about 1/4 of the tunnel T is formed by the No. 2 cutter 60. 40 rotates at a drum rotation angle θ = 286.3 → 300 → 330 → 360 (0) degrees, and during that time, the cutter support frame 50 has a frame swing angle α = −52.8 → −74.3 → −36. .4 → Oscillates to ± 0 degrees, resulting in the state shown in FIG. As described above, when the rotary drum 40 is rotated 360 degrees, the excavation range by the No. 1 cutter 60 becomes a range indicated by hatching in FIG. 7-1 and the excavation range by the No. 2 cutter 60 is shown in FIG. The range of digging by the No. 3 cutter 70 is the range shown by diagonal lines in FIG. 7-3, and the total excavation range is shown in FIG. 8 in which FIGS. 7-1 to 7-3 are superimposed. The range is indicated by diagonal lines.

The shield machine 1 described above has the following effects.
It becomes possible to excavate tunnels having various free cross-sectional shapes. When excavating a tunnel having a predetermined cross-sectional shape (for example, a tunnel T having a rectangular cross-section), the reference phase angle of the rotary drum 40 is determined according to the cross-sectional shape. The first and second rotation drive mechanisms 45 and 55 are driven and controlled so as to control the rotation angle (frame swing angle α) of the cutter support frame 50 in association with the rotation phase angle (drum rotation angle θ) from This can be achieved.

  That is, by changing the control of the first and second rotary drive mechanisms 45 and 55, the cross-sectional shape of the tunnel to be excavated can be easily changed without changing the mechanical structure, It is also possible to change the cross-sectional shape of the tunnel, and the versatility becomes extremely high. Even when it is necessary to excavate the ground to slightly enlarge the tunnel, such as when excavating a curved portion of the tunnel, the excavation can be performed by the rotary cutter 60, and the existing copy cutter is omitted. It becomes possible.

  Since the rotary drum 40, the cutter support frame 50, and the rotary cutter 60 are independently rotated by the first to third rotary drive mechanisms 45, 55, and 65, a complicated structure that interlocks and connects these 40, 50, and 60 is unnecessary. Thus, the structure can be simplified, the manufacturing cost is advantageous, and the rotary cutter 60 is substantially arranged around the first axis A1 and the second axis A2 as well as the third axis A3. Since the rotary cutter 60 can be set to a track that can be excavated efficiently, the excavation capability is extremely high, and it is excellent in terms of strength and durability. Therefore, it becomes possible to cope with the case of excavating natural ground including any soil.

  The excavator main body 2 includes a chamber 19 that can collect excavated soil, and a partition wall 16 that partitions the rear end of the chamber 19, and the rotating drum 40 is a plate constituting the movable partition wall 18 that is a part of the partition wall 16. Since the member 41 is provided, the strength and rigidity in the rotating direction of the rotary drum 40 are very high, and the strength and durability are extremely excellent.

  The first rotation drive mechanism 45 has a plurality of first hydraulic motors 46 attached to the excavator main body 2, and the second rotation drive mechanism 55 has a plurality of second hydraulic motors 56 attached to the rotary drum 40. The third rotation drive mechanism 65 has a plurality of third hydraulic motors 66 attached to the cutter support frame 50, so that the rotary drum 40, the cutter support frame 50, and the rotary cutter 60 can be rotated independently and reliably. It can drive, and the structure of the 1st-3rd rotation drive mechanisms 45, 55, and 65 can also be simplified.

  The cutter support frame 50 is rotatably supported in the vicinity of the outer peripheral portion of the rotary drum 40, and the cutter support frame 50 and the rotary cutter 60 are moved outward from the outer periphery of the rotary drum 40 when viewed from the front. Since it is configured to be possible, the tunnel T having various cross-sectional shapes larger than the rotating drum 40 can be excavated with certainty.

  A pair of rotary cutters 60 rotatably supported around a pair of different third axes A3 on the cutter support frame 50, and a pair of first cutters that rotationally drive the pair of rotary cutters 60, respectively. Since the three-rotation drive mechanism 65 is provided, excavation capability can be increased.

  A plurality of cutter bits are supported on the surface of the rotary drum 40 so as to be rotatable around a fourth axis A4 that is parallel to the first axis A1 and spaced apart from the first axis A1 and the second axis A2. Since the rotary auxiliary cutter 70 equipped with 71 and the fourth rotary drive mechanism 75 that rotationally drives the rotary auxiliary cutter 70 are provided, the excavation capability is improved and the portion that cannot be excavated by the rotary cutter 60 is provided with this rotary auxiliary cutter. It can comprise so that it can excavate with the cutter 70. FIG.

  Since the stirring blade 80 disposed inside the chamber 19 and rotatably supported by the rotary drum 40 and the fifth rotation drive mechanism 85 that rotationally drives the stirring blade 80 are provided, the excavated soil is stirred and removed from the chamber 19. The agitating blade 80 can be easily conveyed to the outside, and the agitation blade 80 is rotated by the fifth rotation driving mechanism 85 and is rotated integrally with the rotary drum 40, so that the agitation performance is greatly improved.

  In the second embodiment, as shown in FIGS. 9-1 to 9-3, a case where a tunnel TA having a horseshoe cross section is excavated by the shield machine 1A similar to the first embodiment is shown. When forming the horizontal bottom surface of the tunnel TA, similarly to the case of forming the horizontal bottom surface of the tunnel T having the rectangular cross section of the first embodiment, the first and second rotational drive mechanisms 45 and 55 are driven and controlled. When the other arc-shaped inner surface is formed, the cutter is made with respect to the rotary drum 40 in a state in which one of the pair of rotary cutters 60 is protruded outward from the outer periphery of the rotary drum 40 in a front view. The support frame 50 is fixed, that is, the distance from the first axis A1 to the one rotary cutter 60 is fixed, and the rotary drum 40 is rotated. Conventionally, after a tunnel with a circular cross section is formed, it is necessary to create a road with a predetermined width through which people and vehicles pass and be separated from the lower end of the tunnel to the upper side, and this work load is very large. In the example, since the tunnel TA having a bowl-shaped cross section can be excavated, a road having a predetermined width can be easily and reliably formed on the bottom surface thereof.

  As shown in FIGS. 10-1 to 10-3, the shield machine 1B has a triangular shaped cutter support frame 50B supported by the rotary drum 40 so as to be rotatable around the second axis A2. And three rotary cutters 60B that are rotatably supported by the cutter support frame 50B around three different third axes A3, and three third cutters that rotationally drive the three rotary cutters 60B, respectively. A rotary drive mechanism (not shown) is provided, the rotary auxiliary cutter 70 is omitted, and the other configuration is the same as that of the shield machine 1 of the first embodiment. A tunnel TBa having a circular cross section can be excavated as shown in FIG. 10-1, and a tunnel TBb having an oval cross section can also be excavated as shown in FIGS. 10-1 and 10-2.

  As shown in FIGS. 11-1 to 11-3, the shield machine 1C includes a rhombus-shaped cutter support frame 50C in a front view supported by the rotary drum 40 so as to be rotatable around the second axis A2. , Four rotary cutters 60C rotatably supported around four different third axes A3 on the cutter support frame 50C, and four third rotations for rotating the four rotary cutters 60C, respectively. The rotary auxiliary cutter 70 is omitted, and the other configuration is the same as that of the shield machine 1 of the first embodiment. A tunnel TCa having a circular cross section can be excavated as shown in FIG. 11-1, and a tunnel TCb with one side widened as shown in FIG. 11-2 and FIG. 11-3 can be excavated.

  As shown in FIGS. 12-1 to 12-3, the shield machine 1D rotates around a pair of different second axes A2 that are symmetric with respect to the first axis A1 on the rotary drum 40, respectively. A pair of cutter support frames 50D supported in a possible manner, a pair of second rotational drive mechanisms (not shown) for rotationally driving the pair of cutter support frames 50D, and a pair of different cutter support frames 50D. A pair of rotary cutters 60D (a total of four rotary cutters 60D) that are rotatably supported around the third axis A3, and four third rotary drives that rotationally drive the four rotary cutters 60D, respectively. The rotary auxiliary cutter 70 is omitted, and the other configuration is the same as that of the shield machine 1 of the first embodiment. A tunnel TDa having a circular cross section can be excavated as shown in FIG. 12-1, and a tunnel TDb having an oval cross section can also be excavated as shown in FIGS. 12-2 and 12-3.

Instead of the rotating drum 40, a first rotating member provided with one or a plurality of spokes arranged in front of the partition wall 16 and extending radially may be provided. In this case, by supporting the cutter support frame 50 rotatably on one or a plurality of spokes, the same operation and effect as in the above-described embodiment can be obtained. Further, as the first and second actuators, hydraulic jacks or electric motors may be applied instead of the first and second hydraulic motors.

  In addition, various modifications can be added and implemented without departing from the spirit of the present invention, and the present invention can be applied to various shield machines 1. For example, when applied to a shield machine that excavates ground including geology such as very hard rock, a plurality of roller cutters are attached to the rotary cutter 60 and the rotary auxiliary cutter 70 instead of a plurality of cutter bits. Can be supported. Further, the excavator of the present invention can be applied to a tunnel excavator that does not assemble the segment S.

It is a longitudinal cross-sectional view of the shield machine of Example 1. It is a front view of a shield machine. 3 is a cross-sectional view taken along line IIIa-IIIa in FIG. 1 and the right half is taken along line IIIb-IIIb in FIG. It is sectional drawing of the principal part containing a cutter support frame and a rotary cutter. It is a block diagram which shows the drive control system of a shield machine. It is a front view when the drum rotation angle of the excavator is 0 degree. It is a front view when the drum rotation angle of the excavator is 30 degrees. It is a front view when the drum rotation angle of the excavator is 60 degrees. It is a front view when the drum rotation angle of the excavator is 73.7 degrees. It is a front view when the drum rotation angle of the excavator is 90 degrees. It is a front view when the drum rotation angle of the excavator is 106.3 degrees. It is a front view when the drum rotation angle of the excavator is 120 degrees. It is a front view when the drum rotation angle of the excavator is 150 degrees. It is a front view when the drum rotation angle of the excavator is 180 degrees. It is a front view when the drum rotation angle of the excavator is 210 degrees. It is a front view when the drum rotation angle of the excavator is 240 degrees. It is a front view when the drum rotation angle of the excavator is 253.7 degrees. It is a front view when the drum rotation angle of the excavator is 270 degrees. It is a front view when the drum rotation angle of the excavator is 286.3 degrees. It is a front view when the drum rotation angle of the excavator is 300 degrees. It is a front view when the drum rotation angle of the excavator is 330 degrees. It is a figure which shows the excavation range by a No. 1 cutter. It is a figure which shows the excavation range by a No. 2 cutter. It is a figure which shows the excavation range by a No.3 cutter. It is a figure which shows the excavation range by a No.1-No.3 cutter. It is a front view of the shield machine of Example 2. It is a front view of the shield machine of Example 2. It is a front view of the shield machine of Example 2. It is a front view of the shield machine of Example 3. It is a front view of the shield machine of Example 3. It is a front view of the shield machine of Example 3. It is a front view of the shield machine of Example 4. It is a front view of the shield machine of Example 4. It is a front view of the shield machine of Example 4. It is a front view of the shield machine of Example 5. It is a front view of the shield machine of Example 5. It is a front view of the shield machine of Example 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A-1D Shield machine 2 digging machine main body 3 Shield jack 5 Excavator 10 Body 16 Bulkhead 19 Chamber 40 Rotating drum 45 1st rotation drive mechanism 46 1st hydraulic motor 50, 50B-50D Cutter support frame 55 2nd rotation Drive mechanism 56 Second hydraulic motor 60, 60B to 60D Rotary cutter 65 Third rotary drive mechanism 66 Third hydraulic motor 70 Rotary auxiliary cutter 75 Fourth rotary drive mechanism 80 Stirrer blade 85 Fifth rotary drive mechanism 90 Drive control unit

Claims (9)

In a shield machine including an excavator main body including a fuselage, a plurality of shield jacks for propelling the excavator main body, and excavating means for excavating natural ground on the front end side of the excavator main body,
A first rotating member supported on the front end side portion of the excavator main body so as to be rotatable about a first axis parallel to the central axis of the excavator main body;
First rotational drive means for rotationally driving the first rotational member;
A second rotating member supported by the first rotating member so as to be rotatable around a second axis that is parallel to the first axis and spaced from the first axis;
Second rotation driving means for rotating the second rotation member with respect to the first rotation member independently of the first rotation driving means;
A plurality of cutter bits or roller cutters are provided on the surface of the second rotating member so as to be rotatable around a third axis that is parallel to the second axis and spaced apart from the second axis. A rotary cutter,
A hydraulic motor for rotating the rotary cutter with respect to the second rotary member independently of the first and second rotary drive means, and a third rotary drive having a hydraulic motor built in the second rotary member and means,
2. A shield machine according to claim 1, wherein the rotary cutter is configured to be able to excavate a natural ground in front of the center axis of the machine.
The excavator body has a chamber capable of collecting excavated soil, and a partition wall that partitions the rear end of the chamber,
2. The shield machine according to claim 1, wherein the first rotating member includes a rotating drum having a plate member constituting a part of the partition wall. The first rotation driving means has a plurality of first actuators attached to an excavator main body, and the second rotation driving means has a plurality of second actuators attached to a first rotation member, 3. The shield machine according to claim 2, wherein the third rotation driving unit includes a plurality of the hydraulic motors attached to the second rotation member. The second rotating member comprises a cutter support frame that is rotatably supported near the outer periphery of the first rotating member,
4. The shield machine according to claim 3, wherein the second rotary member and the rotary cutter are configured such that the rotary cutter is movable outward from the outer periphery of the first rotary member in a front view. A plurality of rotary cutters rotatably supported around a plurality of different third axes on the second rotary member, and a plurality of hydraulic motors that respectively rotate and drive the plurality of rotary cutters. The shield machine according to claim 4.   A plurality of second rotation members that are rotatably supported around a plurality of different second axes by the first rotation member, and a plurality of second rotation drive means for rotationally driving the plurality of second rotation members, respectively. The shield machine according to claim 4 or 5, wherein the shield machine is provided. Drive control means for drivingly controlling the first to third rotation drive means;
The drive control means controls the rotation angle of the second rotation member in association with the rotation phase angle from the reference phase angle of the first rotation member according to the cross-sectional shape of the tunnel to be excavated. The shield machine according to any one of claims 1 to 6, wherein the rotary drive means is controlled. A plurality of cutter bits supported on the surface of the first rotating member so as to be rotatable around a fourth axis that is parallel to the first axis and spaced apart from the first axis and the second axis. Or a rotary auxiliary cutter equipped with a roller cutter,
A fourth rotational drive means for rotationally driving the rotary auxiliary cutter;
The shield machine according to any one of claims 1 to 7, further comprising: A stirring blade disposed inside the chamber and rotatably supported by the first rotating member;
The shield machine according to any one of claims 1 to 8, further comprising a stirring blade rotation driving unit that rotationally drives the stirring blade.

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