JP2007169944A - Cutter plate for tunnel boring machine, and its recovery method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutter plate for a tunnel boring machine recovered after the construction of a tunnel and constituted to facilitate the recovery of an outer peripheral cutter plate part with an outer diameter formed larger than the inner diameter of a tunnel lining body. <P>SOLUTION: The cutter plate 1 is formed by providing the outer peripheral surface of a center cutter plate part 2 detachably with the inner peripheral surface of the outer peripheral cutter plate part 3 of annular shape. The outer peripheral cutter plate part 3 is formed by connecting a plurality of cutter pieces 31-34 and key cutter pieces 35, 36 in a circumferential direction by bolts. After the construction of the tunnel, connection between the center cutter plate part 2 and the outer peripheral cutter plate part 3 is released to recover the center cutter plate part 2 backward together with an boring machine body 10, and then the key cutter pieces 35, 36 in the outer peripheral cutter plate part 3 are detached, recovered and removed. Afterwards, the cutter pieces 31-34 are disconnected from one another and recovered for removal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cutter plate for a tunnel excavator that has been excavated in the ground and then recovered through the tunnel and can be reused, and a method for recovering the cutter plate.

  In tunnel construction where a tunnel lining body is constructed on the excavation wall surface while excavating a tunnel in the ground from the start shaft side with a tunnel excavator, when the tunnel excavator reaches the arrival shaft, It is collected on the ground and reused, but there are existing manholes on the arrival side, or there are buildings in the surrounding area and there are no reaching shafts, or two tunnels If you do not provide a reach shaft as in the case where the excavator is docked in the ground, or if the reach shaft is not completed, or if the tunnel excavator is made to reach the existing long pipeline so as to be orthogonal, etc. The tunnel excavator must be withdrawn toward the start shaft side and collected.

  As such a recovery-type tunnel excavator, for example, as described in Patent Document 1, the outer diameter of the outer cylinder is the same as the tunnel diameter, and the outer cylinder can be pulled back into the outer cylinder. There is known a tunnel excavator composed of an excavator main body arranged, and the excavator main body is detachably locked to an inner surface of the outer trunk, and a cylindrical inner trunk and a front portion of the inner trunk. A cutter head rotatably supported by a partition wall provided integrally, a driving means for the cutter head, and a discharging means for excavating sediment excavated by the cutter head, and the diameter of the cutter head can be reduced. Forming.

  And when the tunnel is excavated to a predetermined length by this tunnel excavator, the excavated sediment discharging means is collected and removed through the tunnel lining body, and the cutter head is reduced in diameter to the inner diameter of the tunnel lining body, and After unlocking the inner body from the outer body, the excavator body is recovered and removed rearward through the tunnel lining body with the outer body left on the excavation wall surface.

  In the tunnel excavator configured as described above, the diameter of the cutter head that can be reduced in diameter is such that several spokes having a plurality of cutter bits projecting forward are rotated by a drive motor. The central cutter head is formed radially from the tip of the central shaft in the outer diameter direction, and a central cutter head is formed by these spokes to excavate the tunnel central portion smaller than the inner diameter of the tunnel lining, and the projection of each spoke A spoke piece with a plurality of cutter bits projecting forward is detachably attached to the end face, and a tunnel diameter equal to the outer diameter of the tunnel lining body is excavated by these spoke pieces. ing.

On the other hand, since the cutter plate of the tunnel excavator is a spoke type, it is not suitable for excavating soft ground that tends to collapse or ground that is likely to generate groundwater, even though it is suitable for excavating hard ground with excellent independence. is there. In order to excavate such collapsible ground, a so-called face plate type cutter plate is used. To apply this cutter plate to a recovery type tunnel excavator, the outer diameter is larger than the inner diameter of the tunnel lining body. A central cutter plate portion having a small diameter and an outer peripheral cutter plate portion are detachably connected to the outer peripheral surface of the central cutter plate portion, for example, as described in Patent Document 2, and this outer cutter plate The part is configured to excavate a tunnel diameter equal to the outer diameter of the tunnel lining body.
Japanese Patent No. 3439745 Japanese Patent No. 2038809

  According to the cutter head in the recovery-type tunnel excavator described in Patent Document 1, when removing the spoke piece from the spoke body when the excavator body is recovered, the spoke piece can be removed even if the spoke bolt is removed from the spoke body. Since the front end surface of the outer body of the tunnel excavator is present behind the piece, the spoke body cannot be recovered inside the machine, so that the worker can come out to the excavation surface side of the cutter head. The removal work must be performed, and the work is not only dangerous, but also the removal work is difficult because the work space is extremely narrow.

  In addition, when two tunnel excavators are docked in the ground, or when the tunnel excavator reaches the existing pipe line so as to be orthogonal, when the front ground of the tunnel excavator is improved, Since there is no working space on the excavation surface side, there is a problem that it cannot be recovered.

  On the other hand, according to the cutter plate described in Patent Document 2, since the outer cutter plate portion is formed in an annular shape, the outer peripheral end face can be closely attached to and supported by the tunnel excavation wall surface. After removing the bolts connecting the outer peripheral surface of the central cutter plate part and the inner peripheral surface of the outer cutter plate part, the central cutter plate part is extracted from the inner peripheral surface of the outer cutter plate part. Although it can be recovered rearward integrally with the main body, the ring-shaped outer peripheral cutter plate portion cannot be recovered rearward and remains in the reaching shaft. Therefore, when there is no reaching shaft, it cannot be recovered, it must be left as it is with a part of the drilling wall covered with the outer trunk, and it cannot be reused and is extremely uneconomical. There was a problem.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a cutter plate including a central cutter plate portion and an annular outer peripheral cutter plate portion. The present invention provides a cutter plate for a tunnel excavator configured so that the outer cutter plate portion can be efficiently and reliably recovered after being recovered together with the main body, and a method for recovering the cutter plate.

  In order to achieve the above object, a cutter plate of a tunnel excavator according to the present invention is a cutter plate in a tunnel excavator that is collected through a tunnel excavation body of an excavated tunnel as described in claim 1, and has an outer diameter. Consists of a central cutter plate portion having a diameter smaller than the inner diameter of the tunnel lining body, and an annular outer peripheral cutter plate portion detachably coupled to the outer peripheral surface of the central cutter plate portion, The outer cutter plate portion is divided into a plurality of cutter pieces in the circumferential direction, and adjacent cutter pieces are detachably coupled by bolts, and at least one of these cutter pieces has a width between both side surfaces. Is provided with a key cutter piece formed so as to gradually become narrower from the inner peripheral side toward the outer peripheral side.

  In the cutter excavator of the tunnel excavator configured as described above, the invention according to claim 2 is that each cutter piece including the key cutter piece has a peripheral wall with a fixed width projecting rearward from the periphery of the front plate portion. Yes, the opposing side walls of the peripheral walls of adjacent cutter pieces are joined together detachably by bolts, and the inner peripheral surface of the inner peripheral wall of each cutter piece is joined to the outer peripheral surface of the central cutter plate. And detachably coupled with a bolt.

  According to a third aspect of the present invention, there is provided a tunnel excavator comprising a cutter plate including the central cutter plate portion and an annular outer peripheral cutter plate portion formed by detachably coupling a plurality of cutter pieces in the circumferential direction. After excavating a tunnel, the cutter plate is recovered through the lining body covering the tunnel excavation surface, and the cutter plate and the drive unit of the cutter plate are connected from the outer trunk of the tunnel excavator. The excavator main body is separated and the outer cutter plate portion is disconnected from the central cutter plate portion, and then the excavator main body and the outer cutter plate portion of the cutter plate are left on the excavation wall. Collect the back of the cutter plate together with the central cutter plate part, and then use the space part of the removal mark of the central cutter plate part, and first, between the end faces on both sides incorporated as part of the outer cutter plate part. Width of The space part of the removal trace of the central cutter plate part by releasing the connection between the key cutter piece formed so as to be gradually narrowed from the peripheral side toward the outer peripheral side and the cutter piece adjacent to both sides of the key cutter piece. Then, the cutter pieces are sequentially removed from the adjacent cutter pieces, and the entire outer cutter plate part is disassembled and removed, and these cutter pieces are collected through the tunnel lining body. It is characterized by that.

  In the method for recovering the cutter plate of the tunnel excavator configured as described above, the invention according to claim 4 is directed to the method of collecting the key cutter piece of the outer cutter plate portion of the cutter plate on the cutter plate prior to recovering the cutter plate. It is characterized by being located in the periphery.

  According to the cutter plate of the tunnel excavator of the present invention and the method for recovering this cutter plate, the outer cutter has a central cutter plate portion whose outer diameter is smaller than the inner diameter of the tunnel lining body, and an inner peripheral surface of the central cutter plate portion. It consists of an annular outer peripheral cutter plate part that is removably connected to the peripheral surface. When recovering, the center cutter plate part and outer peripheral cutter plate part are uncoupled, and then the excavator body is moved backward. Of course, the central cutter plate portion can be recovered integrally with the excavator body by removing the central cutter plate portion, and the removal trace of the central cutter plate portion is surrounded by the annular outer peripheral cutter plate portion. The outer cutter plate can be easily disassembled and removed using the space.

  At this time, the outer cutter plate portion is divided into a plurality of cutter pieces that are detachably coupled to each other by bolts, and at least one of these cutter pieces has a width between both sides from the inner peripheral side to the outer peripheral side. Since the key cutter pieces are formed so as to gradually become narrower toward each other, each cutter piece is guided in the direction perpendicular to the radial direction of the cutter plate with the joint surfaces joined to each other as a guide, that is, the tunnel length. Without requiring the work of disassembling while pulling out in the vertical direction, first, after uncoupling the key cutter piece from the adjacent cutter pieces on both sides, the space is the removal mark of the central cutter plate part. By pulling it out, it can be easily removed and collected using the space, and then the cutter piece combined with this key cutter piece is removed. Because, a plurality of cutter pieces sequentially by utilizing the space portion, efficiently recovered can be removed.

  Therefore, although there is an outer trunk of the tunnel excavator that is left behind in the state where the tunnel excavation wall surface is covered and supported in the vicinity of the rear of the cutter plate, Even when there is almost no work space ahead, the outer cutter plate portion can be smoothly and reliably disassembled and recovered using the space portion of the removal trace of the central cutter plate portion.

  According to the second aspect of the present invention, a peripheral wall having a constant width projects from the periphery of the front plate portion of each cutter piece including the key cutter piece constituting the outer cutter plate portion toward the rear. Yes, the opposing side walls of the peripheral walls of adjacent cutter pieces are joined together detachably by bolts, and the inner peripheral surface of the inner peripheral wall of each cutter piece is joined to the outer peripheral surface of the central cutter plate. The bolts are removed from the inside of the machine and the connection between the central cutter plate and the outer cutter plate is released without the operator coming out to the excavation surface side of the cutter plate. The work of releasing the connection between pieces can be performed smoothly while ensuring safety.

  Furthermore, prior to collecting the cutter plate, as described in claim 4, by setting the key cutter piece of the outer cutter plate portion of the cutter plate at the upper peripheral portion of the cutter plate, After recovering the key cutter piece, the remaining cutter piece can be used as a scaffold, and the connecting portion can be sequentially separated from the upper peripheral side cutter piece and can be safely and efficiently recovered and removed.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a face plate type cutter plate 1 and FIG. 2 is a longitudinal side view of a front half portion of a tunnel excavator provided with the cutter plate 1. In this figure, the cutter plate 1 has a disk-shaped central cutter plate portion 2 whose outer diameter is smaller than the inner diameter of a tunnel wrapping body S described later, and an outer peripheral surface of the central cutter plate portion 2. An annular outer peripheral cutter plate portion 3 which is detachably coupled with an inner peripheral surface by a bolt 9 and an inner peripheral surface is fitted to the outer peripheral surface of the outer peripheral cutter plate portion 3 to thereby attach a bolt 9 ′. And the circular ring members 4 coupled to each other. The outer diameter of the ring member 4 is formed to be equal to the outer diameter of the outer body 11 of the tunnel excavator, and the inner diameter is formed to be larger than the inner diameter of the tunnel covering body S. Accordingly, the outer diameter of the outer cutter plate 3 connected to the inner peripheral surface of the ring member 4 is also made larger than the inner diameter of the tunnel covering body S.

  The central cutter plate portion 2 is provided with a ring-shaped peripheral wall 2c having a constant width that is refracted at a right angle with respect to the front plate portion toward the outer periphery of the circular front plate portion, that is, toward the tunnel covering body S side. And the central portion thereof is integrally fixed to the outer peripheral surface of the front end portion of the rotation center shaft 13 that is rotationally driven by the drive motor 12 mounted on the excavator body 10, and further, the central portion is attached to the front plate portion. A plurality of pairs (four pairs in the figure) of a pair of earth and sand intake openings 5 and 5 that are spaced apart in the circumferential direction are provided radially over the front end of the inner peripheral surface of the ring-shaped peripheral wall 2c. A pair of parallel openings 5 and 5 is formed in a spoke-shaped face plate 2a, and a hollow fan-shaped face plate is interposed between the adjacent spoke-shaped face plates 2a and 2a via the opening 5. 2b is formed. Cutter bits 6 are projected forward at regular intervals in the radial direction on both side edges and the center of the spoke-shaped face plate portion 2a.

  On the other hand, the outer cutter plate part 3 is divided into a plurality of fan-shaped cutter pieces 31 to 36 in the circumferential direction, and the side surfaces facing each other of adjacent cutter pieces are joined to each other in a detachable manner by bolts 9 ′. In this way, the inner peripheral surface of each cutter piece 31-36 is detachably coupled to the opposing outer peripheral surface of the ring-shaped peripheral wall 2c of the central cutter plate portion 2 by bolts 9. In addition, the outer peripheral surface of the outer cutter plate 3 is detachably coupled to the inner peripheral surface of the circular ring member 4 by a bolt 9 '.

  Specifically, each of the cutter pieces 31 to 36 has an inner / outer curved in a circular arc with a constant width at the peripheral edge of the front plate portion, that is, the inner / outer peripheral edge curved in the circumferential direction and the straight side edges. The peripheral wall portions 3c and 3d and the straight side wall portions 3e and 3e that are long in the radial direction protrude in a state of being refracted at a right angle to the front plate portion, and face each other in adjacent cutter pieces. The side wall portions 3e and 3e are joined to each other, and the outer peripheral cutter plate portion 3 is formed by sequentially connecting and connecting in the circumferential direction with bolts 9 ′, and the inner peripheral wall curved in an arc shape The inner peripheral surface of the portion 3c is joined to the opposing outer peripheral surface of the ring-shaped peripheral wall 2c of the central cutter plate portion 2 and is detachably coupled by a bolt 9. The front plate portion of each cutter piece 31 to 36 is formed so as to be flush with the front plate portion of the central cutter plate portion 2 on the vertical plane, and the inner peripheral wall portion 3c thereof is the central cutter portion. It is formed in the same width as the peripheral wall 2c of the plate part 2 and is curved in an arc shape with the same degree of curvature.

  Further, the outer peripheral surface of the outer peripheral wall portion 3d curved in an arc shape in the circumferential direction in each cutter piece 31 to 36 is joined to the opposing inner peripheral surface of the ring member 4 formed to have the same width as the peripheral wall portion 3d. Thus, the peripheral wall portion 3d is detachably coupled to the ring member 4 by a bolt 9 '. The ring-shaped peripheral wall 2c of the central cutter plate part 2 and the inner peripheral wall part 3c of the cutter pieces 31 to 36 are coupled to the peripheral wall part 2c and the peripheral wall part 3c at fixed intervals in the circumferential direction by bolt mounting holes 7 ( 3), a bolt 9 is inserted between the bolt mounting holes 7 and 7 and a nut 8 is screwed together, and the side wall portions 3e and 3e of adjacent cutter pieces are also coupled to each other. Bolts may be inserted between the bolt mounting holes and screwed with the nuts 8, but as shown in FIG. 4, bolt insertion holes 7 'are provided at a plurality of locations on one side wall portion 3e joined to each other, and the other side wall portion. Screw holes 8 'that are opposed to these bolt insertion holes 7' are provided in 3e, and bolts 9 'are screwed into the screw holes 8' from the bolt insertion holes 7 '.

  Similarly, the outer peripheral wall 3d of each of the cutter pieces 31 to 36 is provided with bolt insertion holes 7 'penetrating the inner and outer peripheral surfaces of the peripheral wall 3d at regular intervals in the circumferential direction. Screw holes 8 'that face the bolt insertion holes 7' are provided on the peripheral surface, and the bolts 9 'are screwed into the screw holes 8' from the bolt insertion holes 7 ', so that the cutter pieces 31 to 36 are ringed. Removably coupled to member 4.

  The central cutter plate portion 2 and the outer cutter plate portion 3 are formed so as to be symmetrical with respect to each other. Specifically, as shown in FIG. 1, the central cutter plate portion 2 has the spoke shape. The face plate portion 2a protrudes radially from the rotation center axis 13 of the cutter plate 1 in the circumferential direction with an angular interval of 90 degrees from each other, and the outer cutter plate portion 3 is basically vertically and horizontally The cutter pieces 31 to 34 having the same size and the same shape are divided into four equal parts, and both sides of one of the cutter pieces 31 are formed as key cutter pieces 35 and 36.

  Specifically, in a state where the cutter piece 31 having the key cutter pieces 35 and 36 disposed on both sides is positioned on the upper peripheral side of the cutter plate 1, the both sides of the cutter plate 1 are symmetrical to the left and right. The cutter pieces 32 and 33 on both sides that are disposed on the both sides are provided at the center in the circumferential direction so as to sandwich the face plate portion 2a on both sides of the center cutter plate portion 2 and the face plate portion 2a. In the extending direction of the pair of openings 5 and 5, the spoke-shaped central surface plate portion 3 a and the ring-shaped peripheral wall 2 c of the central cutter plate portion 2 and the inner peripheral wall portions 3 c of these cutter pieces 32 and 33 A pair of openings 5 ′ and 5 ′ parallel to each other with the central face plate portion 3a interposed therebetween are provided, and openings 5 ′ having the same shape as the openings 5 ′ are provided at both end portions in the circumferential direction. In addition, a plurality of cutters are provided forward at the edge of the face plate portion provided with these openings 5 ′. It is projecting a Tsu door 6.

  Similarly, the cutter piece 34 disposed on the lower peripheral portion side is provided at the center portion in the circumferential direction so as to sandwich the lower spoke-shaped face plate portion 2a in the central cutter plate portion 2 and the face plate portion 2a. In the extending direction of the pair of openings 5 and 5, the spoke-shaped central face plate 3a and the central face plate are connected via the ring-shaped peripheral wall 2c of the central cutter plate 2 and the inner peripheral wall 3c of the cutter piece 34. A pair of openings 5 ′ and 5 ′ parallel to each other across the portion 3a, and openings 5 ′ having the same shape as the openings 5 ′ are provided at both end portions in the circumferential direction. A plurality of cutter bits 6 project from the end edge portion of the face plate portion provided with these openings 5 ′ toward the front.

  On the other hand, the cutter piece 31 on the upper peripheral side where the key cutter pieces 35 and 36 are arranged on both sides is the same shape as the cutter pieces 32 to 34 as the overall shape including the key cutter pieces 35 and 36. However, the two cutter pieces 35 and 36 are divided with respect to the cutter piece 31, and the upper spoke-shaped face plate portion 2 a in the central cutter plate portion 2 is formed at the center portion of the cutter piece 31. In the extending direction of the pair of openings 5 and 5 provided so as to sandwich the face plate portion 2a, spokes are formed via the ring-shaped peripheral wall 2c of the central cutter plate portion 2 and the inner peripheral wall portion 3c of the cutter piece 34. A central plane plate portion 3a having a shape and a pair of openings 5 'and 5' parallel to each other with the central plane plate portion 3a interposed therebetween are provided, and the key cutter pieces 35 and 36 on both sides have one opening at the center. 5 'is provided between the inner and outer peripheral surfaces. A plurality of cutter bits 6 project forward from the end edge of the face plate portion provided with these openings 5 ′. Further, a plurality of cutter bits 6 are also provided on the front surface of the ring member 4 so as to protrude forward.

  Further, both side wall portions 3e, 3e of the cutter pieces 32, 33 disposed on both sides of the outer cutter plate portion 3, and both side wall portions 3e, 3e of the cutter piece 34 disposed on the lower periphery side, and the both sides The one side wall portion 3e of the key cutter pieces 35, 36 joined to the side wall portion 3e of the cutter pieces 32, 33 arranged on the diameter line of the cutter plate 1 is disposed on the upper peripheral side. The side wall portions 3e 'and 3e' of the cutter piece 31 and the other side wall portion 3e 'of the key cutter pieces 35 and 36 joined to the side wall portion 3e' and joined by bolts 9 'are extended. The width of the key cutter pieces 35 and 36 in the circumferential direction is gradually narrowed from the inner peripheral side toward the outer peripheral side by inclining the line in a direction intersecting the upper side on the diameter line in the vertical direction of the central cutter plate portion 2. That is, it is formed in a wedge shape.

  In addition, as shown in FIG. 2, a jack 25 oriented in the radial direction is mounted on the rear surface of the spoke-shaped arbitrary face plate portion 2a in the central cutter plate portion 2, and the copy is attached to the tip of the rod 26. The cutter 27 penetrates the outer peripheral wall portion 3d of the outer cutter plate 3 and the ring member 4 and protrudes freely from the ring member 4 so that the copy cutter 27 overshoots the ground in the construction of the tunnel curve portion. It is configured to cut.

  Next, the structure of the recovery-type tunnel excavator provided with the cutter plate 1 configured as described above will be briefly described. As shown in FIG. 5, the tunnel excavator is used in a muddy water shield method. An excavator having an outer cylinder 11 made of a cylindrical steel pipe whose outer diameter is substantially the same as the tunnel excavation diameter, and an outer peripheral end face of the outer end of the outer cylinder 11 are integrally formed by welding or the like. An annular plate-shaped support wall 14 which is fixed and has a circular hole 15 having a diameter smaller than the inner diameter of the tunnel lining body S constructed on the tunnel excavation wall surface, and the above-mentioned support wall 14 The excavator body 10 has a short cylindrical inner cylinder 16 supported in a circular hole 15 so that it can be pulled out rearward through a sealing material 17, and the outer cylinder 11 is circumferentially connected to the inner peripheral surface in the longitudinal direction. Multiple propulsion jacks 18 and direction correction jacks arranged at regular intervals in the direction 19, and feeding and discharging mud pipes 20 and 21 that are means for discharging excavated earth and sand, and an erector 22 that assembles segments.

  The excavator body 10 is integrally provided with a partition wall 16a sealing the opening end of the inner cylinder 16 at the front end of the short cylindrical inner cylinder 16, and the center of rotation of the cutter plate 1 at the center of the partition wall 16a. The shaft 13 is rotatably supported, and a drive motor 12 that rotationally drives the cutter plate 1 is mounted on the rear surface of the partition wall 16a. The rear end portion of the inner cylinder 16 of the excavator body 10 is received by a propulsion reaction force receiving member 23 that is detachably fixed to the inner peripheral surface of the outer cylinder 11.

  The tunnel excavator configured as described above is installed in the start shaft C (shown in FIG. 6), and the tunnel T is excavated in a predetermined direction while the cutter plate 1 is rotated. Each time a certain length of tunnel is excavated, segments are assembled on the excavation wall surface by the erector 22 to cover the excavation wall surface, and the propulsion reaction force of the propulsion jack 18 is received on the front end surface of the tunnel lining body S. Thus, the tunnel excavator is advanced by extending the propulsion jack 18. At this time, the propulsive force by the propulsion jack 18 is transmitted to the excavator body 10 via the propulsion reaction force receiving member 23, and the ground is excavated while pressing the cutter plate 1 against the face.

  The earth and sand excavated by the cutter plate 1 is taken into the earth and sand chamber 24 between the cutter plate 1 and the partition wall 16a of the excavator body 10 through the openings 5 and 5 'provided in the cutter plate 1. It is discharged to the tunnel side together with the muddy water by the recirculated muddy water by the above-mentioned sending and discharging mud pipes 20 and 21 communicating with the sediment chamber 24.

  After excavating the tunnel T while lining the excavation wall surface to the predetermined position with this tunnel excavator, the excavator body 10 must be retracted through the tunnel lining body S to the start shaft side and collected. If this is not the case, for example, as shown in FIG. 6, when the tunnel T is excavated to the retaining wall d of the shaft D, the drill shaft is excavated through the tunnel lining body S that has been constructed. In order to recover the main body 10, prior to this recovery, the ground around the front end of the tunnel excavator is improved by chemical injection or the like, and the improved ground E prevents groundwater from entering the machine. .

  After that, first of all, the erector 22, the feed / drain mud pipes 20, 21, the propulsion jack 18, the direction correction jack 19, etc. are disassembled, removed, etc. and recovered backward through the tunnel lining body S and the propulsion reaction force is received. While the member 23 is removed and the excavator main body 10 is fixed to the outer trunk 11, the worker enters the earth and sand chamber 24 through an entrance (not shown) provided in the partition wall 16a, and from the rear side of the cutter plate 1 The bolt 9 'that connects the peripheral wall 2c of the central cutter plate portion 2 and the inner peripheral wall portion 3c of the outer cutter plate portion 3 in the cutter plate 1 is removed. It should be noted that the propulsion jack 18 and the direction correcting jack 19 may be removed after the excavator body 10 is collected if it does not interfere with the recovery of the excavator body 10.

  Next, the excavator body 10 is pulled backward, and the short cylindrical inner cylinder 16 is extracted from the circular hole 15 of the support wall 14 fixed to the inner peripheral surface of the outer cylinder 11. At this time, since the central cutter plate portion 2 provided integrally with the front end portion of the rotation center shaft 13 in the cutter plate 1 is uncoupled from the outer cutter plate portion 3 as described above, as shown in FIG. Retreats integrally with the excavator body 10 and moves backward through the circular hole 15 of the support wall 14. In order to recover the excavator body 10 having the central cutter plate 2 to the start shaft through the tunnel lining body S, for example, the inner trunk of the excavator body 10 extracted from the circular hole 15 of the support wall 14 is used. Wheels (not shown) are mounted on the lower peripheral portion of 16 and the lower peripheral portion of the central cutter plate portion 2 that has passed through the circular hole 15, and these wheels roll on the inner bottom surface of the tunnel lining S. It can be done by moving.

  Thus, when the central cutter plate portion 2 of the cutter plate 1 is removed, the outer cutter plate portion 3 remains in the state of being fitted and supported on the tunnel excavation wall surface, and is surrounded by the inner peripheral surface of the outer cutter plate portion 3. As shown in FIG. 8, a space portion 28 is provided in the removal trace of the central cutter plate portion 2, that is, the extraction trace. And this space part 28 is utilized for work space, and this outer periphery cutter board part 3 is disassembled and removed.

  First, in the plurality of cutter pieces 31 to 35 forming the outer cutter plate part 3, the key cutter pieces 35 are incorporated so as to be extractable toward the working space, that is, toward the center of the cutter plate 1. , 36 is recovered and removed. At this time, in consideration of the safety and workability of the disassembling work of these cutter pieces 31 to 35, the key cutter pieces 35 and 36 are positioned at the upper part when the tunnel excavation work is completed in advance. The cutter plate 1 is rotated and stopped. Then, using the lower cutter piece 34 as a scaffold, remove the bolts 9 ′ connecting the side wall portions 3e ′, 3e ′ of the upper cutter piece 31 and the side wall portions 3e ′, 3e ′ of the key cutter pieces 35, 36. At the same time, the bolt 9 'that joins the side wall 3e of the key cutter pieces 35, 36 and the side wall 3e of the side cutter pieces 32, 33 is removed, and further, the outer peripheral wall 3d of the key cutter pieces 35, 36 and the ring After removing the bolt 9 'which is connected to the member 4, as shown in FIG. 9, the key cutter pieces 35 and 36 are inserted into the space portion between the adjacent cutter pieces 31 and 32 and between 31 and 33. It is collected and removed by pulling it into 28.

  Next, after removing the bolt 9 'that joins the outer peripheral wall 3d of the upper cutter piece 31 to the inner peripheral surface of the ring member 4 using the space 28, the upper cutter piece as shown in FIG. 31 is collected and removed, and the side cutters 32 and 33 are similarly connected to the side walls 3e and 3e of the lower cutter piece 34 by side walls 3e and 3e connected to the bolts 9 'by the bolts 9'. After removing 'the bolt 9' which joins the outer peripheral wall 3d and the ring member 4 and then removing and removing it as shown in FIG. The coupling bolt 9 'between the outer peripheral wall 3d of the lower cutter piece 34 and the ring member 4 is removed, and the lower cutter piece 34 is recovered and removed as shown in FIG.

  In this way, the outer cutter plate part 3 is disassembled into a plurality of cutter pieces 31 to 36, carried out through the tunnel lining body S to the start shaft side, recovered, and again when the next tunnel construction is performed, Used as the outer cutter plate 3. On the other hand, the ring member 4 of the cutter plate 1 is left as a part of the covering material of the tunnel excavation wall surface together with the outer trunk 11 without being collected. In the above-described embodiment, two key cutter pieces are incorporated among the plurality of cutter pieces 31 to 36 constituting the outer peripheral cutter plate portion 3 of the cutter plate 1, but only one piece is included. Alternatively, the ring member 4 may be divided into a plurality of parts according to the cutter pieces 31 to 36, and the structure of the outer peripheral cutter plate part 3 provided integrally on the outer peripheral surface of each cutter piece may be adopted.

The front view of a cutter board. The longitudinal side view of the first half part of a tunnel excavator. FIG. 2 is a sectional view taken along line AA in FIG. 1. BB sectional drawing in FIG. A longitudinal side view of the entire tunnel excavator. The simplified longitudinal side view of the state where the tunnel has been excavated to a predetermined position. The simplified vertical side view of the state which collect | recovers the excavator main body. The front view of the outer periphery cutter board part of the cutter board after removing a center cutter board part. The front view of the outer periphery cutter board part which has removed the key cutter piece. The front view of the state which has removed the upper cutter piece. The front view of the state which has removed the both-sides cutter piece. The front view of the state which has removed the lower cutter piece.

Explanation of symbols

1 Cutter plate 2 Central cutter plate
2c Ring-shaped peripheral wall 3 Outer cutter plate
3c, 3d inner peripheral wall
3e side wall 9 bolt
10 Excavator body
31 ~ 34 Cutter piece
35, 36 Key cutter piece

Claims (4)

  A cutter plate in a tunnel excavator that is recovered through the tunnel lining body of the excavated tunnel, the outer cutter having a central cutter plate portion whose outer diameter is smaller than the inner diameter of the tunnel lining member, and an outer peripheral surface of the central cutter plate portion. It consists of a ring-shaped outer cutter plate that removably connects the inner peripheral surfaces. This outer cutter plate is divided into a plurality of cutter pieces in the circumferential direction, and adjacent cutter pieces are attached and detached with bolts. The key cutter piece is formed so that the width between both side surfaces gradually becomes narrower from the inner peripheral side toward the outer peripheral side at least one of these cutter pieces. Cutter plate for tunnel excavator.   Each cutter piece, including the key cutter piece, has a peripheral wall with a fixed width projecting rearward from the periphery of the front plate, and the opposing side walls of the adjacent peripheral walls of the adjacent cutter pieces are joined to each other with bolts. Cutter plate of a tunnel excavator characterized in that it is freely connected and the inner peripheral surface of the inner peripheral wall portion of each cutter piece is joined to the outer peripheral surface of the central cutter plate and is detachably connected by bolts. .   An annular outer peripheral cutter plate in which a central cutter plate portion and a plurality of cutter pieces are detachably coupled in the circumferential direction and the inner peripheral surfaces of these cutter pieces are detachably coupled to the outer peripheral surface of the central cutter plate portion. A method for recovering the cutter plate through a lining body covering the wall surface of the tunnel excavation after excavating the tunnel with a tunnel excavator having a cutter plate comprising And cutting the excavator main body having the cutter plate and the drive unit of the cutter plate from each other and releasing the coupling of the outer cutter plate portion to the central cutter plate portion, and then the outer cutter plate portion of the outer cylinder and the cutter plate. The excavator main body is recovered backward integrally with the central cutter plate portion of the cutter plate while leaving the surface of the excavator on the excavation wall surface. A key cutter piece formed so that the width between both end faces incorporated as a part of the cutter plate portion gradually becomes narrower from the inner peripheral side toward the outer peripheral side, and is adjacent to both sides of this key cutter piece. Uncouple the piece and remove it by removing it toward the space of the removal trace of the central cutter plate, and then remove the cutter piece in sequence with the adjacent cutter piece to remove the entire outer cutter plate. A method for recovering a cutter plate of a tunnel excavator, comprising disassembling, removing, and recovering these cutter pieces through a tunnel lining body.   4. The cutter plate in a tunnel excavator according to claim 3, wherein the key cutter piece of the outer cutter plate portion of the cutter plate is positioned on the upper peripheral portion of the cutter plate prior to collecting the cutter plate. Recovery method.

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