JP2007303064A - Agitation device of shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agitation device of a shield machine, which agitates excavated soil in a chamber over the overall width in a chamber longitudinal direction, exerts an improved agitation ability, prevents an agitation blade from interfering with a cutter support member, mixing blades, etc. that move in the chamber, and injects a mud additive into the excavated soil in the chamber so as to be widely distributed in the same, to thereby positively and promptly mix the former with the latter. <P>SOLUTION: The agitation device 8 is formed of an agitation blade support structure 71, a rotation driving mechanism 72, and a movement driving mechanism 73. The agitation blade support structure 71 supports the agitation blade 70 so as to be longitudinally movable between a protruding position in which the agitation blade 70 is rotatable about an axis in parallel with the longitudinal direction and protrudes into the chamber 6, and a receding position in which the agitation blade 70 recedes to a rear end of the chamber 6. The rotation driving mechanism 72 drives the agitation blade 70 for rotation. The movement driving mechanism 73 drives the agitation blade 70 for longitudinal movement so as to switch the agitation blade 70 between the protruding position and the receding position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a stirring blade including a rotation driving means for rotating a stirring blade for stirring the excavated soil in a chamber of a shield machine, and a movement driving means for driving the movement in the front-rear direction. It relates to the device.

  Conventionally, a shield machine has a fuselage, a plurality of shield jacks for propelling the fuselage, a cutter head provided on the front end side of the fuselage, a chamber for accommodating excavated soil excavated by the cutter head, and a rear end of the chamber Have been widely put into practical use (for example, Patent Documents 1 to 3), which have a partition wall for partitioning and a soil removal device for discharging the excavated soil in the chamber, and further equipped with a stirring device for agitating the excavated soil in the chamber. 5).

  The stirring device of Patent Document 1 includes a first kneading blade fixed to a cutter head in a rearward protruding shape, a second kneading blade fixed to a partition wall in a forward protruding shape, and a head shaft on which the cutter head is attached to a front end portion. An agitator fixed to the member is provided, and the first kneading blade and the agitator rotate integrally with the cutter head. The stirring devices of Patent Documents 2 to 5 include a stirring blade disposed in the chamber and a rotation driving mechanism that rotationally drives (rotates) the stirring blade.

  In the stirring device of Patent Document 2, the stirring blade is attached to the front end portion of the rotating shaft member, the bearing member is mounted in a penetrating manner on the partition wall, the rotating shaft member is rotatably supported by the bearing member, and the partition wall is inserted. The housing is fixed to the rear surface side of the partition wall, and the rotational drive mechanism includes a drive motor attached to the housing and a pinion gear that transmits the drive force of the drive motor to the rotary shaft member. In the stirring devices of Patent Documents 3 and 4, a driving machine having a rotation driving mechanism that supports and rotates the stirring blades is fixedly provided in the partition wall.

  In the stirring device of Patent Document 5, the stirring blade is attached to the front portion of the rotating shaft member, the bearing member is mounted on the cutter head and the drum, respectively, and the front end portion of the rotating shaft member is rotatable on the bearing member on the cutter head side. Supported, the rear part of the rotary shaft member is rotatably supported by the bearing member on the drum side, the drum is inserted, and the rotation drive mechanism is fixedly provided near the outer periphery of the drum, and the rotary shaft member A pinion that is fixed to the rear end and meshes with the ring gear. The stirring blade rotates integrally with the cutter head and the drum, and the rotation driving mechanism is operated by rotation of the drum to rotate the stirring blade.

  By the way, in the shield machine, the cutter head is supported and includes a cutter support member that is at least rocked and moved along the partition wall. By the excavator having the cutter support member and the cutter head, various cross-sectional shapes (for example, rectangular shapes) are provided. Those capable of excavating and forming tunnels of (cross-section) are in practical use.

  In shield machine, drilling is performed by forming a mud material injection port in the partition wall and injecting the mud material into the front chamber from this mud material injection port to increase or decrease the fluidity of the excavated soil. A technique for improving the soil is generally used. In this case, the agglomerated material injected into the chamber is kneaded into the excavated soil by agitating the excavated soil with a stirring device.

Japanese Patent Laid-Open No. 10-153086 JP 2003-97181 A Japanese Patent Laid-Open No. 8-291653 JP 62-153494 A JP 60-105797 A

  In the stirring device of Patent Document 1, a kneading blade and an agitator are fixedly provided on the cutter head, and the kneading blade and the agitator rotate integrally with the cutter head to stir the excavated soil in the chamber. If the cutter head is not rotating, the excavated soil in the chamber cannot be agitated.

  In the stirring devices of Patent Documents 2 to 4, the stirring blade rotates at a fixed position in the chamber. In the stirring device of Patent Document 5, the stirring blade rotates integrally with the cutter head and the drum and rotates. Since the position of the stirring blade in the front-rear direction is a fixed position, it is difficult to stir the excavated soil in the chamber over the entire width of the chamber in the front-rear direction, and high stirring ability may not be expected. is there.

  In addition, when the shield machine has a cutter support member that movably supports the cutter head and a kneading blade provided on the cutter head so as to protrude backward, the stirring blade may interfere with the cutter support member and the kneading blade. Therefore, even if the stirring blades cannot be provided, or even if the stirring blades are provided so as to avoid this, it is difficult to obtain high stirring ability because the arrangement of the stirring blades is greatly restricted.

  In addition, in the technology of injecting the mud material into the chamber from the mud material injection port formed in the partition wall, it is difficult to inject the mud material to spread widely inside the excavated soil in the chamber, As described above, with the stirring blades that cannot be expected to have a stirring ability, there is a possibility that the mud material injected into the chamber cannot be kneaded quickly and reliably into the excavated soil.

  An object of the present invention is to rotate a stirring blade that stirs excavated soil in a chamber around an axis parallel to the front-rear direction and to a protruding position and a retracted position in a stirring device of a shield machine. Cutter that is driven to move in the front-rear direction so that the position can be switched to agitate the excavated soil in the chamber over almost the entire width in the front-rear direction of the chamber to increase the agitation capacity, and the agitation blade moves in the chamber Prevents interference with support members, kneading blades, etc., provides stirring blades at desired positions to demonstrate high stirring capacity, and sprays mud to spread widely inside excavated soil in chamber And kneading the excavated soil quickly and reliably.

  A stirrer for a shield machine according to claim 1, a fuselage, a cutter head provided on the front end side of the fuselage, a chamber for storing excavated soil excavated by the cutter head, a partition wall partitioning the rear end of the chamber, In a shield machine having a soil discharging means for discharging excavated soil in the chamber, the agitating blade for agitating the excavated soil in the chamber, the agitating blade being rotatable about an axis parallel to the front-rear direction and A stirring blade support structure for supporting the stirring blade so as to be movable in the front-rear direction over the protruding position protruding into the chamber and the retracted position retracted to the rear end side of the chamber, and rotational driving for rotationally driving the stirring blade And a driving means for moving the stirring blade in the front-rear direction so that the position of the stirring blade can be switched over between the protruding position and the retracted position.

  In this stirrer, the stirrer support structure allows the stirrer blade to rotate about an axis parallel to the front-rear direction and to protrude into the chamber, and a retracted position retracted to the rear end side of the chamber. Therefore, it is supported so as to be movable in the front-rear direction. The agitating blade is rotated by the rotation driving means, and the excavated soil in the chamber is agitated by this agitating blade, and the agitating blade can be switched between the protruding position and the retracted position by the moving driving means in the front-rear direction. Driven by movement. Here, it is desirable that the stirring blade is configured to be rotationally driven by the rotation driving means regardless of the position of the stirring blade in the front-rear direction.

  When the stirring blade is driven to move in the front-rear direction, the excavated soil in the chamber is stirred by the stirring blade over substantially the entire width in the front-rear direction of the chamber, and the stirring ability is enhanced. Moreover, the stirring blade is driven to move in the front-rear direction, so that the shield machine has a cutter support member, a kneading blade, etc. that move in the chamber, and the stirring blade at the protruding position is a cutter support member, a kneading blade, etc. If there is a possibility of interference, the stirring blade is switched to the retracted position at an appropriate timing, and the stirring blade is prevented from interfering with the cutter support member, the kneading blade, etc. Therefore, the stirring blade is provided at the intended position. As a result, high stirring ability is exhibited.

Here, the following configuration can be adopted in the invention of claim 1.
The shield machine includes a cutter support member that is supported movably by a cutter head and that moves at least swinging along a partition wall, and a stirring blade at a protruding position enters a movement region of the cutter support member. Item 2).

  The stirring blade has a plurality of screw blades attached to the front end portion of the rotating shaft member and having a spiral shape in which the rear end side is positioned on the front side in the rotational direction relative to the front end side, and from the front end portion of the rotating shaft member A muddy material injection means for injecting the muddy material toward the screw blades is provided (claim 3). An accommodation recess is formed so as to be recessed backward from the partition so that the agitation blade can be accommodated, and the retracted position is a position where the agitation blade is accommodated in the accommodation recess.

  The stirring blade support structure includes a sleeve extending rearward from the rear end portion of the housing recess, and a movable member that is fitted in the sleeve so as to be movable in the front-rear direction, and the rotary shaft member is rotatably supported. The rotation drive means has a drive motor attached to the inside of the movable member and directly connected to the rotary shaft member, and the movement drive means is attached to a support member at the rear end of the sleeve and moves the movable member in the front-rear direction. A drive device for driving is provided. The said mud material injection means communicates the injection port formed in the side part of the front-end part of a rotating shaft member, the mud material supply port formed in the movable member, and these injection ports and a mud material supply port. Thus, it has a mud material passage formed inside the movable member and the rotary shaft member (Claim 6).

  According to the stirring device of the shield machine of claim 1, the stirring blade for stirring the excavated soil in the chamber, and the protruding position in which the stirring blade is protruded into the chamber so as to be rotatable about an axis parallel to the front-rear direction. And a stirring blade support structure that supports the moving in the front-rear direction over the retracted position retracted to the rear end side of the chamber, rotational drive means for rotationally driving the stirring blade, Since it is provided with a movement drive means for moving in the front-rear direction so that the position can be switched over the retreat position, the agitating blade stirs the excavated soil in the chamber over substantially the entire width in the front-rear direction of the chamber, The stirring ability can be increased, and the shield machine has a cutter support member and a kneading blade that move in the chamber, and the stirring blade at the protruding position may interfere with the cutter support member and the kneading blade. If the stirring blade is By switching to the retracted position at an appropriate timing, the stirring blade can be prevented from interfering with the cutter support member, the kneading blade, etc. Therefore, the stirring blade can be provided at the intended position to exhibit high stirring ability. .

  According to the shield machine of the shield machine according to claim 2, the shield machine includes a cutter support member that is supported movably by the cutter head and that is at least oscillated and moved along the partition wall. Since the agitating blade at the protruding position has entered, the agitating blade interferes with the cutter support member when applied to a shield machine that can excavate and form tunnels with various cross-sectional shapes by this excavator having a cutter support member and a cutter head. It is possible to prevent this, and to provide a stirring blade at a desired position to exhibit a high stirring ability.

  According to the stirring device of the shield machine of claim 3, the stirring blade is attached to the front end portion of the rotating shaft member, and the plurality of screws having a spiral shape in which the rear end side is positioned on the front side in the rotational direction relative to the front end side. Since it has blades, and equipped with a mud material injection means for injecting the mud material from the front end portion of the rotary shaft member toward the screw blades, the stirring blade is moved and driven in the front-rear direction, and the rotary shaft member The direction of the mud that has been sprayed from the front end toward the screw blades is changed by the rotating screw blades, and sprayed backward so as to spread widely inside the excavated soil in the chamber. It can be kneaded quickly.

  According to the stirring device of the shield machine of claim 4, the housing recess is formed so as to be recessed backward from the partition so that the stirring blade can be accommodated, and the retreat position is a position where the stirring blade is accommodated in the housing recess. Therefore, it is possible to reliably prevent the stirring blade from interfering with the cutter support member, the kneading blade, or the like that moves in the chamber by positioning the stirring blade in the retracted position.

  According to the stirring device of the shield machine of claim 5, the stirring blade support structure includes a sleeve extending rearward from the rear end portion of the housing recess, and is fitted into the sleeve so as to be movable in the front-rear direction, and the rotating shaft member is provided. A rotationally supported movable member, the rotational drive means includes a drive motor mounted inside the movable member and directly connected to the rotational shaft member, and the movable drive means is a support member at the rear end of the sleeve. And having a drive device that moves and drives the movable member in the front-rear direction, simplifies the stirring blade support structure, and reliably drives the stirring blade to rotate about an axis parallel to the front-rear direction by the drive motor. The agitating blade can be reliably moved and driven integrally with the movable member in the front-rear direction by the driving device, the agitating blade can be driven to rotate regardless of the position of the agitating blade in the front-rear direction, and the tip of the rotating shaft member Pressurized mud material may be capable of injecting consists portion.

  According to the stirrer for the shield machine of claim 6, the mud material injection means includes an injection port formed in a side portion of the front end portion of the rotating shaft member, and a mud material supply port formed in the movable member. Since the movable member and the mud material passage formed inside the rotary shaft member so as to communicate with the injection port and the mud material supply port, the mud material is supplied to the mud material supply port of the movable member. By supplying, the mud material can be guided to the injection port by the mud material passage, and can be reliably injected from the injection port toward the screw blade.

  The shield machine has a fuselage, a cutter head provided on the front end side of the fuselage, a chamber for storing excavated soil excavated by the cutter head, a partition wall for partitioning the rear end of the chamber, and discharging excavated soil in the chamber. The stirring device of the shield machine according to the present invention includes a stirring blade for stirring the excavated soil in the chamber, and the stirring blade is rotatable about an axis parallel to the front-rear direction and into the chamber. An agitating blade support structure that supports the protruding position and the retracted position retracted to the rear end side of the chamber so as to be movable in the front-rear direction, a rotational drive means that rotationally drives the agitating blade, and agitation A moving drive means is provided for moving the blade in the front-rear direction so that the position of the blade can be switched between the protruding position and the retracted position.

  As shown in FIGS. 1 to 3, the shield machine 1 is provided on the front side of the body 2, a plurality of shield jacks 3 for propelling the body 2, a plurality of middle-folded jacks 4 for folding the body 2, and the body 2. Excavator 5 having a pair of left and right cutter heads 62, chamber 6 for storing excavated soil excavated by cutter head 62, partition wall 7 for partitioning the rear end of chamber 6, and excavating soil in chamber 6 are agitated 6 A pair of left and right agitation devices 8, a soil removal device 9 having a pair of left and right soil discharge pipes 80 for discharging the excavated soil in the chamber 6, and a pair of left and right surfaces that assemble the segment S on the inner surface of the tunnel T excavated by the cutter head 62. Electa device 11 and the like.

  The body 2 includes a front body 20 and a rear body 21, and a rear end portion of the front body 20 and a front end portion of the rear body 21 are connected to each other via a center folding portion 22 so as to be able to be folded. A partition wall 7 including a fixed partition wall 25 and a movable partition wall 26 is provided inside the front barrel 20, and an annular body 30 is fixed. The annular body 30 includes a front wall member 31 forming a fixed partition wall 25, a pair of left and right cylindrical members 32 having front end portions coupled to the front wall member 31, and a rear end portion of the pair of cylindrical members 32 coupled to each other. And a rear wall member 33 having an outer peripheral portion coupled to the inner surface of the front barrel 20.

  As shown in FIG. 2, in the fixed partition wall 25, four manholes 40 are formed, four manhole opening / closing plates 41 are provided, twelve drug injection ports 42 are formed, ten earth pressure gauges 43 are provided, Six circular openings 44 corresponding to the six sets of the stirring devices 8 are formed, and a pair of left and right soil discharge ports 45 corresponding to the pair of soil discharge devices 10 are formed. The six circular openings 44 are provided around each movable partition wall 26 so that the four circular openings 44 are symmetrical vertically and horizontally, and the pair of soil discharge ports 45 are provided below the pair of movable partition walls 26. Is provided. Each movable partition wall 26 has one manhole 46 and one manhole opening / closing plate 47.

  As shown in FIGS. 1 to 3, a ring web 50 is fixed to the inner surface of the rear barrel 21 at the front end portion thereof, and a tail seal 51 is provided at the rear end portion. A rear work deck 55 having a front end connected to the ring web 50 and extending rearward is disposed inside the rear barrel 21.

  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 front barrel 20 and the front end portion of the rear barrel 21. The rear portion of the jack body of each shield jack 3 is fixed to the ring web 50 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 11 backward.

  The plurality of middle-folded jacks 4 extend around the rear end portion of the front barrel 20 and the front end portion (center-folded portion 22) of the rear barrel 21 so as not to interfere with the plurality of shield jacks 3 along the inner surface thereof. The front end portions of the middle folding jacks 4 are disposed at appropriate intervals (substantially equal intervals) in the direction, and the front end portions of the middle folding jacks 4 are rotatably connected to a bracket 52 coupled to the front trunk 20. 4 is rotatably connected to a bracket 53 coupled to the rear barrel 21.

  The pair of left and right excavating devices 5 have the same structure, and each excavating device 5 includes a drum 60 supported on the front trunk 20 so as to be rotatable around the first axis A1, and a drum 60 from the first axis A1. The swing frame 61 is rotatably supported around the eccentric second axis A2, and is supported by the swing frame 61 so as to be rotatable about the third axis A3 eccentric from the second axis A2. The cutter head 62 includes a plurality of first hydraulic motors 63 that rotate the drum 60, a plurality of second hydraulic motors 64 that rotate the swing frame 61, and a plurality of third hydraulic motors 65 that rotate the cutter head 62. . A large number of cutter bits 62 a are attached to the surface portion of the cutter head 62. The swing frame 61 corresponds to a cutter support member in which the cutter head 62 is movably supported and at least swings along the partition wall 7.

Next, the stirring device 8 will be described in detail.
As shown in FIGS. 1 to 3, the six sets of stirring devices 8 have the same structure, and the four sets of stirring devices 8 are arranged around each movable partition wall 26 so as to be symmetrical in the vertical and horizontal directions. As shown in FIGS. 4 and 5, each stirring device 8 has a stirring blade 70 for stirring the excavated soil in the chamber 6, and the stirring blade 70 is rotatable about an axis parallel to the front-rear direction and into the chamber 6. It is movable in the front-rear direction over a protruding position (a position indicated by a virtual line in FIG. 4) and a retracted position (a position indicated by a solid line in FIG. 4) retracted to the rear end side of the chamber 6. A stirring blade support structure 71 for supporting, a rotational drive mechanism 72 for rotationally driving the stirring blade 70, a moving drive mechanism 73 for moving the stirring blade 70 in the front-rear direction so as to be switchable between a protruding position and a retracted position; A mud material injection mechanism 74 for injecting the mud material into the chamber 6 is provided.

  A front end of a U-shaped recess forming member 75 having a front U-shaped opening is coupled to a peripheral edge of the circular opening 44 formed in the partition wall 7 (fixed partition wall 25), and the stirring blade 70 is accommodated by the recess forming member 75. An accommodation recess 76 is formed so as to be recessed rearward from the partition wall 7, and the stirring blade 70 is received in the accommodation recess 76 to be in the retracted position, and the swinging frame of the excavator 5 is in the retracted position. It will be in the state which entered the 61 movement area.

  The stirring blade 70 is attached to the front end portion of the rotary shaft member 77 that is long in the front-rear direction, and a plurality of (for example, three) screw blades having a spiral shape in which the rear end side is located closer to the front side in the rotation direction than the front end side. 70a. The stirring blade 70 (the plurality of screw blades 70a) has a front end located in the same vertical plane including the front end of the rotating shaft member 77, and the stirring blade 70 is located in the retracted position and is accommodated in the accommodation recess 76. Thus, the front ends of the stirring blade 70 and the rotary shaft member 77 substantially coincide with the front-rear position of the partition wall 7.

  The stirring blade support structure 71 includes a sleeve 78 extending rearward from the rear end portion of the housing recess 76, and a movable member 80 that is fitted in the sleeve 78 so as to be movable in the front-rear direction and the rotary shaft member 77 is rotatably supported. And have. A circular opening 75 a is formed in the rear wall of the recess forming member 75, the sleeve 78 has a front end portion coupled to a peripheral edge of the circular opening 75 a of the recess forming member 75, and a central portion in the longitudinal direction at the rear wall of the annular body 30. The member 33 is coupled and supported in a penetrating manner. A cylindrical low friction member 78 a is fixedly provided on the inner surface of the sleeve 78.

  The movable member 80 includes a head member 81, a shaft support member 82, and a rear cylindrical member 83. The rear end portion of the head member 81 and the front end portion of the shaft support member 82 are coupled in a surface contact state. The space between them is sealed by an annular seal member 84a, and the rear end portion of the shaft support member 82 and the inner flange portion 83a of the front end portion of the rear tubular member 83 are coupled in a surface contact state, and the space between them is an annular seal. Sealed by a member 84b.

  Shaft holes 81a and 82a are formed in the head member 81 and the shaft support member 82, respectively, and the center portion in the front-rear direction of the rotary shaft member 77 is inserted into the shaft hole 81a of the head member 81 so as to be freely slidable. 77 and the head member 81 are sealed by an annular seal member 84c, the rear portion of the rotary shaft member 77 is inserted into the shaft hole 82a of the shaft support member 82, and the shaft is supported via a pair of front and rear bearing members 85a and 85b. The member 82 is rotatably supported.

  The rotation drive mechanism 72 has a drive motor 86 attached inside the movable member 80 and directly connected to the rotation shaft member 77. The drive motor 86 is fixed forwardly to the rear end portion of the shaft support member 82 of the movable member 80 and is disposed inside the front portion of the rear cylindrical member 83.

  The movement drive mechanism 73 is attached to a rear end wall member 79 corresponding to a rear end support member of the sleeve 78, and drives and moves the movable member 80 in the front-rear direction (for example, a fluid pressure cylinder such as a hydraulic cylinder). Have Inside the rear cylindrical member 83 of the movable member 80, a rod connecting member 88 is fixed to a portion located on the rear side of the drive motor 86, a rear end wall member 89 is fixed to the rear end of the rear cylindrical member 83, and a sleeve Cylinder insertion holes 79a and 89a are formed in the rear end wall member 79 at the rear end of 78 and the rear end wall member 89 at the rear end of the rear cylindrical member 83, respectively.

  For example, when the drive device 87 is a fluid pressure cylinder, the drive device 87 is inserted forward through the cylinder insertion holes 79 a and 89 a of both rear end wall members 79 and 89, and the cylinder body 87 a of the drive device 87 is the rear end of the sleeve 78. The rear end wall member 79 is connected via a bracket 79 b, and the front end portion of the rod 87 b is connected to the rod connecting member 88 inside the rear cylindrical member 83. Fluid pressure is supplied to the drive device 87 from a drive control unit (not shown), and the drive device 87 is driven and controlled by this drive control unit.

  The mud material injection mechanism 74 includes one (or a plurality of) injection ports 90 formed on the side portion of the front end portion of the rotary shaft member 77, a mud material supply port 91 formed on the movable member 80, and these A muddy material passage 92 formed inside the movable member 80 and the rotary shaft member 77 and a pipe member 93 are provided so that the injection port 90 and the muddy material supply port 91 communicate with each other. The injection port 90 is formed between the screw blades 70 a adjacent to the stirring blade 70 in the side portion of the front end portion of the rotating shaft member 77.

  The mud material passage 92 has an internal passage portion 92a and a side hole portion 92b formed in the rotary shaft member 77. In the movable member 80, an annular inner groove portion 92c and a passage portion 92d formed in the head member 81 are provided. A passage portion 92e formed in the shaft support member 82 and a passage portion 92f formed in the inner flange portion 83a of the rear cylindrical member 83 are provided. In the rotating shaft member 77, the side hole 92b is formed in a portion of the rotating shaft member 77 fitted in the head member 81, and the injection port 90 and the side hole 92b are connected to the passage portion 92a. An annular inner groove portion 92c of the head member 81 is connected to the square hole portion 92b, and the rotary shaft member 77 and the head member 81 are sealed by a pair of annular seal members 94a on both the front and rear sides of these connection portions. .

  The passage portion 92d of the head member 81 and the passage portion 92e of the shaft support member 82 are connected, and the periphery of these connection portions is sealed between the head member 81 and the shaft support member 82 by an O-ring 94b. The passage portion 92e of the support member 82 and the passage portion 92f of the inner flange portion 83a of the rear cylindrical member 83 are connected, and between the shaft support member 82 and the inner flange portion 83a of the rear cylindrical member 83 around these connection portions. Is sealed with an O-ring 94c. A mud material supply port 91 is formed in the rear end wall member 89 of the rear cylindrical member 83, and the mud material supply port 91 is connected to the passage portion 92 f of the inner flange portion 83 a of the rear cylindrical member 83 by a pipe member 93. ing.

  The pair of left and right earth removing devices 9 have the same structure, and as shown in FIGS. 1 to 3, each earth removing device 9 is screwed in the earth discharging pipe 100 and a screw warbing rotatably disposed inside the earth discharging pipe 100. A screw motor 102 that rotationally drives the gas 101 and the screw wobbler 101 is provided.

Next, the operation of the shield machine 1 will be described.
In this shield machine 1, the body 2 is propelled by a plurality of shield jacks 3, and at that time, the front trunk 20 is swung by a plurality of middle folding jacks 4 with respect to the rear trunk 21, and the propulsion direction of the trunk 2 is changed. be changed. As the body 2 is propelled, the excavation device 5 excavates the ground in front of the body 2, the excavated soil is collected into the chamber 6, and is agitated by the 6 sets of the agitation devices 8. It is discharged by. Thus, the tunnel T is excavated and formed, and a plurality of segments S are sequentially assembled in a ring shape by the pair of erector devices 7.

  When the excavated soil in the chamber 6 is stirred by the six sets of stirring devices 8, the stirring blades 70 are switched by the rotation driving mechanism 72 in the state where the stirring blades 70 are switched to the protruding positions by the movement driving mechanism 73. Is rotated to agitate the excavated soil in the chamber 6, and the agitating blade 70 is driven to move in the front-rear direction by the movement drive mechanism 73, so that the excavation in the chamber 6 is performed over substantially the entire width in the front-rear direction of the chamber 6. Stir the soil.

  At that time, when the mud material is ejected from the front end portion of the rotating shaft member 77 toward the screw blade 70a of the stirring blade 70 by the mud material injection mechanism 74, the screw blade 70a that the mud material rotates. The direction of the air is changed and sprayed forward, and the excavated soil is kneaded by the agitating blade 70. Here, the agitating blade 70 is driven to move in the front-rear direction by the movement drive mechanism 73, so It is sprayed so as to spread widely inside the excavated soil, and is reliably and rapidly kneaded into the excavated soil by the stirring blades 70.

  That is, since the excavated soil in the chamber 6 is reliably and quickly improved, the function of the soil removal device 9 for discharging the excavated soil in the chamber 6 is maintained, and the earth pressure of the excavated soil in the chamber 6 is maintained. It is made uniform and the unexpected collapse of the upper ground is prevented.

  By the way, since the stirring blade 70 at the protruding position has entered the moving region of the swing frame 61 of the excavator 5, when the swing frame 61 is positioned in front of the housing recess 76, the stirring blade 70 remains in the protruding position. Then, it interferes with the swing frame 61. Therefore, at a suitable timing before the swing frame 61 is positioned on the front side of the housing recess 76, the agitation blade 70 at the protruding position is moved backward by the movement drive mechanism 73, so that the retraction accommodated in the housing recess 76 is performed. After the swing frame 61 has passed the front side of the housing recess 76, the agitation blade 70 in the retracted position is driven forward by the movement drive mechanism 73 and switched to the protruding position.

  According to the stirring device 8 described above, the stirring blade 70 that stirs the excavated soil in the chamber 6 and the protruding position in which the stirring blade 70 protrudes into the chamber 6 so as to be rotatable about an axis parallel to the front-rear direction. And a stirring blade support structure 71 that supports the moving position in the front-rear direction over the retracted position retracted to the rear end side of the chamber 6, a rotation drive mechanism 72 that rotationally drives the stirring blade 70, and a stirring blade A moving drive mechanism hand 73 is provided to move the front and rear in the front-rear direction so that the position can be switched between the protruding position and the retracted position.

  Therefore, the agitating blade 70 can agitate the excavated soil in the chamber 6 over substantially the entire width in the front-rear direction of the chamber 6 to increase the agitating capacity. If there is a possibility of interference with the moving frame 61, the stirring blade 70 can be switched to the retracted position at an appropriate timing to prevent the stirring blade 70 from interfering with the swinging frame 61. It can be provided at a position to exhibit a high stirring ability.

  The stirring blade 70 is attached to the front end portion of the rotary shaft member 77 and has a plurality of screw blades 70 a having a spiral shape in which the rear end side is positioned on the front side in the rotational direction relative to the front end side. Since the mud material injection mechanism 74 for injecting the mud material from the portion toward the screw blade 70a is provided, the screw blade 70a is driven from the front end portion of the rotary shaft member 77 while the stirring blade 70 is driven to move forward and backward. The direction of the mud that has been sprayed toward the surface is changed by the rotating screw blades 70a, sprayed backward so as to spread widely inside the excavated soil in the chamber 6, and the agitated blades 70 surely and quickly It can be kneaded.

  An accommodation recess 76 is formed so as to be recessed rearward from the partition wall 7 so that the agitation blade 70 can be accommodated, and the retreat position is a position where the agitation blade 70 is accommodated in the accommodation recess 76. It is possible to reliably prevent the stirring blade 70 from interfering with the swing frame 61 that moves in the chamber 6 by being positioned at the position.

  The stirring blade support structure 71 includes a sleeve 78 extending rearward from the rear end portion of the housing recess 76, and a movable member 80 that is fitted in the sleeve 78 so as to be movable in the front-rear direction and the rotary shaft member 77 is rotatably supported. The rotary drive mechanism 72 has a drive motor 86 attached to the inside of the movable member 80 and directly connected to the rotary shaft member 77, and the movable drive mechanism 73 is a rear end wall member of the rear end of the sleeve 78. 79 has a driving device 87 for moving and driving the movable member 80 in the front-rear direction, so that the stirring blade support structure 71 is simplified and the stirring motor 70 is moved around the axis parallel to the front-rear direction by the drive motor 86. It can be reliably rotated and driven, and the driving device 87 can reliably move the stirring blade 70 in the front-rear direction integrally with the movable member 80. Regardless of the position of the stirring blade 70 in the front-rear direction, The 拌羽 roots 70 can be rotationally driven in, and may be capable of injecting constituting the pressurized mud material from the tip portion of the rotary shaft member 77.

  The mud material injection mechanism 74 includes an injection port 90 formed at a side portion of the front end portion of the rotating shaft member 77, a mud material supply port 91 formed in the movable member 80, and the injection port 90 and the mud material. Since it has the movable member 80 and the mud material passage 92 formed in the inside of the rotating shaft member 77 so as to communicate with the supply port 91, the mud material is supplied to the mud material supply port 91 of the movable member 80. Thus, the mud material can be guided to the injection port 90 through the mud material passage 92 and reliably injected from the injection port 90 toward the screw blade 90a.

  The stirring device 8 is not limited to the screw blade 70a as described above, but has a stirring blade having a plurality of blades of various shapes, for example, a spiral shape in which the front end side is positioned on the front side in the rotational direction relative to the rear end side. In the rotary drive mechanism 72, which employs a stirring blade having a plurality of screw blades, and constitutes a mud material injection mechanism so as to inject the mud material directly from the front end portion of the rotary shaft member 77 to the excavated soil ahead, Various modifications such as rotating the stirring blade 70 in the opposite direction to stirring the excavated soil can be implemented.

  Moreover, the stirring apparatus 8 of the present invention can be applied to various shield machines. For example, the shield machine 1A of FIG. 6 digs a tunnel having a rectangular cross section, and includes a body 2A for the tunnel, an excavator 5A having a cutter head 62A, a chamber 6A, a partition wall 7A, and the like. Four sets of stirring devices 8 are provided in the vicinity of the front four corners.

  Further, for example, the shield machine 1B shown in FIG. 7 digs a tunnel having a circular cross section, and includes a body 2B for that, a drilling device 5B having a cutter head 62B, a chamber 6B, a partition wall 7B, and the like. Six sets of stirring devices 8 are provided at equal intervals in the circumferential direction in the vicinity of the outer periphery of the front portion of 2B.

  The agitating device 8 applied to the shield machines 1A and 1B has the same operations and effects as the above-described embodiment. However, in the shield machine 1A, 1B, due to the construction of the excavators 5A, 5B, a member such as a cutter support member in which the cutter heads 62A, 62B are movably supported and moved at least along the partition walls 7A, 7B. Does not exist. Therefore, when the stirring blade 70 is in the retracted position, it is not necessary to position it behind the partition walls 7A and 7B.

  In the shield machine 1, 1A, 1B, the cutter heads 62, 62A, 62B can be provided with a plurality of kneading blades so as to protrude rearward. This further improves the stirring ability. The stirring blade 70 may be switched to the retracted position at an appropriate timing by the movement drive mechanism 73 so that the blade 70 does not interfere.

It is a longitudinal section of a shield machine according to an embodiment of the present invention. It is a front view of a shield machine. The left half is a cross-sectional view taken along line AA in FIG. 1, and the right half is a cross-sectional view taken along line BB in FIG. It is sectional drawing of the principal part containing the stirring apparatus of a shield machine. It is sectional drawing of a stirring apparatus. It is a front view of the shield machine of a modified form. It is a front view of the shield machine of another modification.

Explanation of symbols

1, 1A, 1B Shield machine 2, 2A, 2B Body 6, 6A, 6B Chamber 7, 7A, 7B Bulkhead 8 Stirrer 61 Oscillating frame 62, 62A, 62B Cutter head 70 Stirring blade 70a Screw blade 71 Stirring blade support Structure 72 Rotation drive mechanism 73 Movement drive mechanism 74 Mud material injection mechanism 76 Accommodating recess 77 Rotating shaft member 78 Sleeve 79 Rear end wall member 80 Movable member 86 Drive motor 87 Drive unit 90 Injection port 91 Mud supply port 92 Material passage

Claims (6)

A fuselage, a cutter head provided on the front end side of the fuselage, a chamber for storing excavated soil excavated by the cutter head, a partition wall partitioning the rear end of the chamber, and a soil discharging means for discharging excavated soil in the chamber In the shield machine with
Stirring blades for stirring the excavated soil in the chamber;
The stirring blade is rotatable about an axis parallel to the front-rear direction, and is movable in the front-rear direction over a projecting position where the stirring blade projects into the chamber and a retracted position where the stirring blade is retracted toward the rear end side of the chamber. A stirring blade support structure to support,
A rotation driving means for rotating the stirring blade;
A moving drive means for driving the stirring blade to move in the front-rear direction so that the position can be switched over between the protruding position and the retracted position;
A stirrer for a shield machine, comprising: The shield machine includes a cutter support member that is movably supported by a cutter head and that is at least oscillated along a partition wall,
The stirrer for a shield machine according to claim 1, wherein a stirring blade at a protruding position enters the moving region of the cutter support member. The stirring blade is attached to the front end portion of the rotating shaft member, and has a plurality of screw blades having a spiral shape in which the rear end side is positioned on the front side in the rotational direction than the front end side,
The stirrer for a shield machine according to claim 1 or 2, further comprising a mud material injection means for injecting the mud material from the front end portion of the rotating shaft member toward the screw blades. An accommodation recess is formed so as to be recessed backward from the partition so as to accommodate the stirring blade,
The stirrer for a shield machine according to claim 3, wherein the retreat position is a position where the stirrer blade is housed in the housing recess. The stirring blade support structure includes a sleeve extending rearward from the rear end portion of the housing recess, and a movable member that is fitted in the sleeve so as to be movable in the front-rear direction, and the rotary shaft member is rotatably supported.
The rotation drive means has a drive motor attached to the inside of the movable member and directly connected to the rotary shaft member, and the movement drive means is attached to a support member at the rear end of the sleeve and moves the movable member in the front-rear direction. The stirring device for a shield machine according to claim 4, further comprising a driving device for driving. The said mud material injection means communicates the injection port formed in the side part of the front-end part of a rotating shaft member, the mud material supply port formed in the movable member, and these injection ports and a mud material supply port. The stirring device for a shield machine according to claim 5, further comprising a movable member and a mud material passage formed inside the rotary shaft member.

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