JP4094517B2 - Parent-child shield machine - Google Patents

Description

  The present invention relates to a parent-child shield machine connected to a large-diameter tunnel and constructing a small-diameter tunnel, and more particularly to a parent-child shield machine capable of constructing a small-diameter tunnel eccentric to the large-diameter tunnel.

  As a parent-child shield machine that constructs a small-diameter tunnel by decentering the large-diameter tunnel, one described in Patent Document 1 or 2 is known. Conventionally, this type of parent-child shield machine includes a rotary drum that is eccentrically rotated inside the parent shield machine, and a child shield machine that is eccentrically attached to the rotary drum and attached to be able to start in the axial direction. And an outer cutter for the parent shield machine, which is detachably attached to the cutter of the child shield machine.

  According to such a parent-child shield machine, the rotation angle of the rotary drum is adjusted so that the child shield machine is in a concentric position with respect to the parent shield machine, and the outer shield is attached to the cutter of the child shield machine so that the diameter is increased. After constructing the tunnel, rotate the rotating drum by a predetermined angle to move the child shield machine to the desired eccentric position with respect to the parent shield machine, disconnect the outer cutter from the cutter of the child shield machine, and By starting from the parent shield machine, it can be constructed by connecting the small diameter tunnel eccentrically to the large diameter tunnel.

Japanese Patent Laid-Open No. 10-37660 JP 10-37662 A

  However, in the above-described parent-child shield machine, it is necessary to install a rotating drum that eccentrically rotates the child shield machine in the parent shield machine, resulting in a complicated structure and an increase in cost. In particular, when the outer diameter difference between the parent shield machine and the child shield machine is small, it is difficult to install the rotating drum, and even if it can be installed, the amount of eccentricity is limited.

  A method of sliding the child shield machine in the radial direction from the concentric position to the eccentric position in the parent shield machine without using the rotating drum is also conceivable, but it becomes a very complicated slide mechanism and is feasible. Low. Further, a space for a mechanism for sliding the child shield machine itself cannot be secured in the parent shield machine, and a sufficient amount of eccentricity cannot be secured.

  SUMMARY OF THE INVENTION An object of the present invention, which was created in view of the above circumstances, is to provide a parent-child shield machine that can start with a simple configuration with the child shield machine eccentric with respect to the parent shield machine.

  The parent-child shield machine according to the present invention, which was created to solve the above-mentioned problems, accommodates the child shield frame of the child shield machine eccentrically inside the parent shield frame of the parent shield machine so as to be slidable in the axial direction. The inner shield for the child shield machine is provided on the child shield frame so as to be movable in the eccentric direction of the two frames.

  Further, the inner cutter is preferably provided so as to be movable between a concentric position with respect to the child shield frame and a concentric position with respect to the parent shield frame. Preferably, the inner cutter is provided with an outer cutter for the parent shield machine in a detachable manner, and a connecting / disconnecting means for connecting and disconnecting the outer cutter and the inner cutter is provided.

  The outer cutter is preferably formed in accordance with the outer diameter of the parent shield frame when mounted on the inner cutter moved to a concentric position with respect to the parent shield frame. Further, the outer cutter preferably has a gap that allows the inner cutter to move from a concentric position with respect to the parent shield frame to a concentric position with respect to the child shield frame.

  According to the present invention, the child shield frame is eccentrically accommodated in the parent shield frame in advance, and the inner cutter of the child shield machine is moved in the eccentric direction, thereby driving the outer cutter for the parent shield machine. Since the secondary shield machine is also used, the slave shield machine can be decentered with respect to the master shield machine with a simple configuration.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows a cross-sectional plan view of the parent-child shield machine according to the present embodiment, and FIG. 6 shows a view (front view) taken along line VI-VI in FIG. As shown in the figure, this parent-child shield machine 1 has a child shield frame 5 of a child shield machine 4 (hereinafter referred to as a child machine) inside a parent shield frame 3 (cylinder) of the parent shield machine 2 (hereinafter referred to as a parent machine). (Cylinder) is eccentrically housed so as to be slidable in the axial direction.

  Specifically, a start block 6 of the slave unit 4 is attached to the inside of the parent shield frame 3 so as to partition the face side and the inside of the pit. The starting block 6 also functions as a part of a partition wall that partitions the face side and the inside of the mine. In the starting block 6, a starting hole 7 formed slightly larger than the outer diameter of the child shield frame 5 is formed eccentrically with respect to the parent shield frame 3 along the axial direction.

  On the inner peripheral surface of the start hole 7, seals 8 formed in a ring shape so as to stop water between the child shield frame 5 are attached in multiple stages at intervals in the axial direction. The child shield frame 5 is attached to the start hole 7 so as to be slidable in the axial direction. An engagement / disengagement mechanism 9 (fasteners such as bolts and nuts and welding / cutting) is interposed between the child shield frame 5 and the start hole 7.

  In the child shield frame 5 mounted in the start hole 7, the inner peripheral cutter 10 for the child device 4 is movable in the eccentric direction of the center line L 2 of the child shield frame 5 with respect to the center line L 1 of the parent shield frame 3. It is attached. Specifically, a partition wall 11 is provided inside the child shield frame 5 to partition the face side and the inside of the pit, and the partition wall 11 is provided with an elongated hole 12 formed along the eccentric direction. ing.

  A collar 14 that pivotally supports the rotating shaft 13 of the inner cutter 10 is inserted into the elongated hole 12. The length of the long hole 12 is such that the collar 14 can move from the concentric position to the center line L1 of the parent shield frame 3 shown in FIG. 1 to the concentric position of the center line L2 of the child shield frame 5 shown in FIG. Is set. An oval cover 15 that covers the elongated hole 12 is attached to the collar 14, and a ring-shaped seal 16 that stops water between the cover 11 and the partition 11 surrounds the elongated hole 12. Is attached.

  As shown in FIG. 1, the collar 14 is provided with a housing unit 17 serving as a driving unit that rotationally drives the inner cutter 10. The accommodation unit 17 includes an attachment portion 18 that is fitted and fixed to the inner end of the collar 14, and a gear box 21 that accommodates an external gear 19 provided on the rotary shaft 13 and a pinion 20 that meshes with the external gear 19. . The pinion 20 is driven by a motor 22 attached to the gear box 21. The motor 22, the pinion 20 and the external gear 19 constitute a drive unit.

  A machine-side thrust transmission member 23 extending radially inward is provided on the inner peripheral surface of the child shield frame 5, and a cutter extending radially outward is provided on the mounting portion 18 of the storage unit 17. A side thrust transmission member 24 is provided. The cutter-side thrust transmission member 24 is movable relative to the machine-side thrust transmission unit 23 in the eccentric direction, and the movement range is such that at least the center of the rotating shaft 13 is the center of the parent shield frame 3. It is set in a range that can move from the center line L1 to the center line L2 of the child shield frame 5.

  In the illustrated example, the machine-side thrust transmission member 23 includes a partition wall attached to the inner peripheral surface of the child shield frame 5, and an elongated hole 25 through which the storage unit attachment portion 18 is inserted is opened in the partition wall. Further, the cutter-side thrust transmission member 24 is composed of an elliptical flange attached to the storage unit attachment portion 18 so as to cover the elongated hole 25. However, each thrust transmission member 23, 24 is not limited to this configuration, and may be configured by a column or the like.

  A guide member 26 (concave portion and / or convex portion) for guiding the movement of the cutter-side thrust transmission member 24 in the eccentric direction with respect to the machine-side thrust transmission member 23 is provided at the overlapping portion of both the thrust transmission members 23, 24. And formed in parallel with the eccentric direction. The guide member 26 is formed in a dovetail shape (section dovetail shape) and a convex shape that engages with the dovetail shape, and holds the storage unit 17 so as not to fall down.

  A jack 27 is interposed between the storage unit mounting portion 18 and the inner peripheral surface of the child shield frame 5 as an actuator for moving the storage unit 17 in the eccentric direction. The jack 27 is arrange | positioned so that the storage unit attaching part 18 may be pinched | interposed along the said eccentric direction. The jack 27 on the front side in the eccentric direction is attached to the inner peripheral surface of the child shield frame 5 via a spacer 28 having a thickness corresponding to the amount of eccentricity, so that the dimensions of the jacks 27 are made common. . The actuator is not limited to the jack 27 but may be a rack and pinion, a chain sprocket, or the like.

  As shown in FIG. 6, the inner cutter 10 includes a central portion 29 connected to the rotary shaft 13, a cutter pork 30 attached radially to the central portion 29, and a bit 31 attached to the cutter pork 30. And a ring 32 fitted so as to surround the outer peripheral end of the cutter pork 30. The ring 32 can be omitted. Further, the inner cutter 10 may be a face plate type instead of a spoke type.

  An outer peripheral cutter 33 for the master unit 2 is detachably provided on the outer peripheral portion of the inner peripheral cutter 10. As shown in FIGS. 1 and 6, the outer cutter 33 is a ring 34 formed in accordance with the outer diameter of the parent shield frame 3 when attached to the inner cutter 10 moved to the concentric position with respect to the parent shield frame 3. And a cutter spoke 35 attached to the inner peripheral surface of the ring 34, and a bit 36 attached to the cutter spoke 35. The ring 34 can be omitted.

  A total of three cutter spokes 35 are arranged at a position rearward in the movement direction on the movement direction center line X1 of the diameter of the inner peripheral cutter 10 and a position shifted in phase by 90 degrees with respect to it. It is not arranged on the front side in the movement direction on the movement direction center line X1. This is to allow movement of the inner peripheral cutter 10 in the eccentric direction. A number of cutter spokes 35 may be arranged on the left side of the vertical center line X2 (diameter perpendicular to the center line X1) in FIG.

  Further, the portion of the upper and lower cutter porks 35 where the ring 32 of the inner peripheral cutter 10 abuts the inner peripheral cutter 10 concentric with the parent shield frame 3 as shown in FIG. 6, and the child shield as shown in FIG. A straight portion formed along the moving direction of the inner peripheral cutter 10 on the right side of the center line X2 so that the ring 32 of the inner peripheral cutter 10 is not caught when moving in the concentric state with the frame 5. 37.

  That is, the outer cutter 33 has a gap 38 that allows the inner cutter 10 to move from the position of FIG. 6 to the position of FIG. In the illustrated example, the gap portion 38 is configured such that the linear portion 37 and the cutter pork 35 described above are not disposed forward of the inner cutter 10 in the moving direction. When the outer cutter 33 is a face plate type, the gap portion 38 is formed by cutting out in a circular arc shape on the right side of the center line X2.

  Between the outer cutter 33 and the inner cutter 10, a connecting / disconnecting means 39 for connecting and disconnecting them is provided. The connecting / disconnecting means 39 is formed along the radial direction on the inner peripheral surface of the spoke 35 of the outer cutter 33 and the jack 40 which is accommodated in the spoke 30 of the inner cutter 10 and protrudes and disappears in the radial direction from the outer peripheral end thereof. And an engagement hole 41 into which 40 is inserted and removed. The jack 40 also functions as a copy cutter after the child device 4 is started from the parent device 2.

  As shown in FIG. 1, a plurality of propulsion jacks 42 are attached to the inner peripheral surface of the parent shield frame 3 at a predetermined interval in the circumferential direction. The propulsion jack 42 applies a reaction force to an existing segment (not shown) assembled in a ring shape inside the parent shield frame 3, and advances the parent shield frame 3. Further, inside the propulsion jack 42, an erector (not shown) for assembling the segments is provided.

  The operation of the present embodiment having the above configuration will be described.

  When a large-diameter tunnel is constructed by the master unit 2, the structure shown in FIGS.

  That is, the child shield frame 5 is attached to the start hole 7 in the parent shield frame 3 and fixed by the engagement / disengagement mechanism 9 (bolt nut or the like). Then, the jack 27 in the child shield frame 5 is expanded and contracted so that the inner peripheral cutter 10 is concentric with the parent shield frame 3. Then, the relative movement between the machine side thrust transmission member 23 and the cutter side thrust transmission member 24 is locked by a lock mechanism (not shown). Then, the outer cutter 33 is mounted on the inner cutter 10 and the jack 40 of the connecting / disconnecting means 39 is extended to connect them.

  In this state, the inner peripheral cutter 10 is rotationally driven and the propulsion jack 42 is extended, so that the front face of the parent shield frame 3 is cut by the inner peripheral cutter 10 and the outer peripheral cutter 33, and the excavated earth and sand are formed below the partition wall 11. The soil is discharged by a screw conveyor connected to a discharge port 43 provided in the center, and the segments are assembled in a ring shape inside the parent shield frame 3 by an erector to construct a large-diameter tunnel. At this time, the propulsive force of the propulsion jack 42 is transmitted to the cutters 10 and 33 via the engagement / disengagement mechanism 9, the machine side thrust transmission member 23, and the cutter side thrust transmission member 24.

  In this way, when the small diameter tunnel is continuously constructed by decentering the large diameter tunnel constructed by the base unit 2, the procedure from FIG. 2 is performed.

  First, as shown in FIG. 2, the jack 40 of the connection / disconnection means 39 is contracted, and the outer cutter 33 is separated from the inner cutter 10. Then, the lock mechanism that has locked the relative movement between the machine-side thrust transmission member 23 and the cutter-side thrust transmission member 24 is released. Then, as shown in FIG. 3, the jack 27 in the child shield frame 5 is expanded and contracted, the inner peripheral cutter 10 is guided by the guide member 26 and moved in the eccentric direction, and is concentric with the child shield frame 5. To do.

  As a result, as shown in FIG. 7, the inner cutter 10 moves eccentrically with respect to the outer cutter 33. At this time, since the gap 38 is formed in the outer cutter 33, the inner cutter 10 is allowed to move from the concentric position with respect to the parent shield frame 3 to the concentric position with respect to the child shield frame 5. Then, the relative movement between the machine side thrust transmission member 23 and the cutter side thrust transmission member 24 is locked again by a lock mechanism (not shown).

  Then, as shown in FIG. 4, a cylindrical body 44 (extension shield frame) having the same diameter is welded to the rear end of the child shield frame 5, and attached to the parent shield frame 3 on the inner peripheral surface of the cylindrical body 44. The propulsion jack 42 that has been moved is relocated. In addition, the erector attached to the parent shield frame 3 is moved to the inner peripheral surface of the child shield frames 5 and 44.

  And as shown in FIG. 5, the food | hood 45 accommodated in the front part of the child shield frame 5 is made to protrude ahead with the jack which is not shown in figure, and the earth and sand taking-in chamber 46 for the subunit | mobile_unit 4 is formed. Then, the inner cutter 10 is rotationally driven, the propulsion jack 42 is extended, and the erector is operated.

  As a result, the face in front of the child shield frame 5 is cut by the inner cutter 10, the excavated earth and sand are discharged by the screw conveyor connected to the discharge port 43, and the segment is formed inward of the child shield frame 44 by the erector. It is assembled in a ring shape and is constructed by decentering a small diameter tunnel with respect to a large diameter tunnel. At this time, the propulsive force of the propulsion jack 42 is transmitted to the cutter 10 via the machine side thrust transmission member 23 and the cutter side thrust transmission member 24.

  As described above, according to the present embodiment, the inner peripheral cutter 10 is moved to a position that is concentric with the parent shield frame 3, the outer peripheral cutter 33 is connected to the inner peripheral cutter 10, and the excavation is performed in that state. And you can build a large diameter tunnel. Then, the outer cutter 33 is separated from the inner cutter 10, the inner cutter 10 is moved to a position that is concentric with the child shield frame 5, and the child device 4 is started from the parent device 2, thereby connecting to the large-diameter tunnel. Can be constructed by decentering a small diameter tunnel.

  Here, according to this embodiment, since the child shield frame 5 is eccentrically accommodated in the parent shield frame 3 in advance, the child shield frame 5 itself is moved in the eccentric direction with respect to the parent shield frame 2. No mechanism is required, and simplification and cost reduction of the structure can be promoted. On the other hand, in the present embodiment, a mechanism for moving the inner peripheral cutter 10 in the eccentric direction with respect to the child shield frame 5 is required, but this mechanism is simpler than a mechanism for moving the child shield frame 5 itself. Since it is a mechanism, it does not increase the cost significantly.

  Further, according to the present embodiment, as shown in FIG. 1, the child shield frame 5 can be eccentrically arranged close to the parent shield frame 3 with the installation space (very small space) of the seal 8 therebetween. Even when the difference in outer diameter between the shield frame 3 and the child shield frame 5 is small, a large amount of eccentricity can be secured. That is, only the seal 8 interposed between the parent shield frame 3 and the child shield frame 5 is only a restriction on the amount of eccentricity.

  As described above, according to the present embodiment, the child shield frame 5 is eccentrically accommodated in the parent shield frame 3 in advance, and the inner peripheral cutter 10 of the child device 4 is moved in the eccentric direction. Since it serves also as the drive part of the outer peripheral cutter 33 for 2, the child machine 4 can be started by being eccentric with respect to the parent machine 2 with a simple configuration. Further, even when the outer diameter difference between the child shield frame 5 and the parent shield frame 3 is small, the eccentricity can be increased.

  In the illustrated example, for example, a large-diameter tunnel constructed by the master unit 2 is used as a subway station building, and a small-diameter tunnel constructed by the slave unit 4 is used as a track unit, so that the line unit is horizontal with respect to the station building. Large eccentricity can be arranged in the direction. Thereby, the big effective use space for installing a platform etc. in a station building part is securable.

  Moreover, the eccentric direction of the subunit | mobile_unit 4 is not restricted to a horizontal direction, The up-down direction and the diagonal direction may be sufficient. For example, if the slave unit 4 is eccentric to the uppermost end or the lowermost end of the master unit 2, the top joint or the bottom joint from the large diameter pipe (large diameter tunnel) to the small diameter pipe (small diameter tunnel) in the sewer system. Can be easily realized.

  If the diameter of the jack 40 accommodated in the inner peripheral cutter 10 is made thicker, the protruding stroke from the outer peripheral end of the inner peripheral cutter 10 is further extended, and a bit is attached to the jack 40, the outer peripheral cutter 33 is omitted. It is also possible. In this case, when the inner peripheral cutter 10 is concentric with the parent shield frame 3 as shown in FIG. 6, the jack 40 is extended to the outer diameter of the parent shield frame 3 to obtain a cutter for the parent device 2.

  After excavating and constructing the large-diameter tunnel in this state, the jack 40 is shrunk and immersed in the outer peripheral end of the inner cutter 10, and the inner cutter 10 is moved to the concentric position with the child shield frame 5 as described above. The handset 4 is started. Further, after excavating the large-diameter tunnel, the jack 40 may be pushed out from the outer peripheral end of the inner cutter 10 and discarded.

It is a plane sectional view of a parent-child shield machine concerning a suitable embodiment of the present invention. It is explanatory drawing which shows the action | operation of the said parent-child shield machine. It is explanatory drawing which shows the action | operation of the said parent-child shield machine. It is explanatory drawing which shows the action | operation of the said parent-child shield machine. It is explanatory drawing which shows the action | operation of the said parent-child shield machine. It is a VI-VI line arrow directional view of FIG. It is a VII-VII arrow line view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Parent-child shield machine 2 Parent shield machine 3 Parent shield frame 4 Child shield machine 5 Child shield frame 10 Inner circumference cutter 33 Outer circumference cutter 38 Gap part 39 Connection / disconnection means

Claims (5)

  The child shield frame of the child shield machine is eccentrically placed inside the parent shield frame of the parent shield machine so as to be slidable in the axial direction, and the inner peripheral cutter for the child shield machine is placed in the child shield frame. A parent-child shield machine provided so as to be movable in an eccentric direction.   The parent-child shield machine according to claim 1, wherein the inner cutter is provided so as to be movable between a concentric position with respect to the child shield frame and a concentric position with respect to the parent shield frame.   The outer peripheral cutter for the parent shield machine is detachably provided on the inner peripheral cutter, and a connecting / disconnecting means for connecting and disconnecting the outer cutter and the inner peripheral cutter is provided. Parent-child shield machine.   4. The parent-child shield machine according to claim 3, wherein the outer cutter is formed in accordance with the outer diameter of the parent shield frame when mounted on the inner cutter moved to a concentric position with respect to the parent shield frame. 5. The parent-child shield machine according to claim 3, wherein the outer cutter has a gap that allows the inner cutter to move from a concentric position with respect to the parent shield frame to a concentric position with respect to the child shield frame.

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