JP4693798B2 - Method of collecting excavator body in tunnel excavator - Google Patents

Description

  The present invention relates to a method for recovering an excavator body in a tunnel excavator in which a tunnel having a predetermined length is formed while excavating a tunnel in the ground by a tunnel excavator, and then the excavator body is recovered and removed through the pipe. Is.

  In tunnel construction in which a tunnel is excavated from the start shaft side into the ground using a tunnel excavator, a pipe line is constructed on the wall of the excavation, and when the tunnel excavator reaches the reach shaft, it is recovered from the reach shaft to the ground. However, if there is an existing manhole on the arrival side or there is a building or the like in the vicinity and it is not possible to provide a reach shaft, or the existing tunnel is reached After the construction of the pipeline, if it cannot be recovered through the existing tunnel, the excavator body is left in the state of leaving the outer shell without dismantling the tunnel excavator, and the start shaft side through the pipeline They are collected and removed.

  As such a recovery-type tunnel excavator, for example, as described in Patent Document 1, the inner and outer diameters are formed to be substantially the same as the inner and outer diameters, and the inner peripheral surface of the front end portion has an annular shape. A first partition wall and a second partition wall integrally provided at the front end portion of the inner shell body that is supported by the first partition wall of the outer shell so that it can be pulled out rearward. A cutter plate rotation driving means is mounted on the back surface of the second partition wall, and a plurality of guide rollers capable of rolling on the inner bottom surface of the conduit from the inner bottom surface of the first partition wall are mounted on the outer peripheral surface of the inner shell body. An excavator main body, a cutter plate that is rotatably supported by the second partition wall and can be reduced to an outer diameter that can pass through the first partition wall, and excavated sediment discharge means such as a screw conveyor. Tunnel excavators are known.

And when excavating a tunnel with this tunnel excavator, the rear end portion of the inner shell body of the excavator body is connected to the inner peripheral surface of the outer shell body through a propulsion reaction force transmission member. , While excavating the ground in front with the cutter plate while transmitting the propulsive force from the start vertical shaft side to the tunnel excavator, and excavating the tunnel to a predetermined length, collect the excavated sediment discharge means through the pipeline, The excavator main body in a state in which the cutter head is reduced to a diameter equal to or smaller than the inner diameter of the outer shell body and the propulsion reaction force transmission member is removed and the outer shell body is buried in the excavation wall and left in a state of being removed. Is towed backwards and collected and removed through the pipe line while supporting the excavator body with guide rollers.
Japanese Patent No. 3830918

  However, according to such a method for recovering the excavator body, the excavator body is pulled after the excavator body is removed from the excavator body, and is integrally fixed to the inner peripheral surface of the front end portion of the outer shell body. When the support of the front end portion of the inner shell body by the first partition wall is released by detaching the front end portion of the inner shell body of the excavator body from the inner peripheral surface of the annular first partition wall, The excavator body tilts slightly diagonally downward from the rear end to the front end of the inner shell body due to the weight of the cutter plate protruding forward from the inner shell body, in other words, the forward bending state Will occur.

  Such tilting of the excavator main body smoothly rolls the guide roller between the guide roller and the inner peripheral surface of the outer shell even if the front and rear portions of the inner shell are supported by the guide roller. Therefore, the outer periphery of the lower peripheral part of the cutter plate having a reduced diameter is shifted downward due to its tilting, and the cutter plate is pulled by towing the excavator body. When passing through the first partition, the rear end edge of the lower end portion of the cutter plate abuts on the lower end portion of the front end edge of the first partition wall to prevent further rearward movement. There is a problem that it cannot be collected together with the main body.

  Even if the cutter plate can be passed through the first partition wall, unless the tilting posture is corrected, a subsequent collection operation, for example, a guide for supporting the cutter plate on the outer peripheral surface of the cutter plate having a reduced diameter is provided. There were problems such as adversely affecting the roller mounting operation. In particular, when the body length of the inner shell is shortened to make it lighter and easier to control direction, the excavator body tends to tilt due to the weight of the cutter plate. It was difficult to shorten the shell length of the shell.

  The present invention has been made in view of such problems, and the object of the present invention is to provide a stable state of the reduced diameter cutter plate without tilting the excavator body when the excavator body is collected. The tunnel excavator can efficiently perform the operation of smoothly and reliably passing through the ring-shaped first partition wall integrally provided on the inner peripheral surface of the front end portion of the outer shell body and collecting it back together with the excavator body. It is in providing the recovery method of the excavator main body in.

  In order to achieve the above object, the excavator main body recovery method in the tunnel excavator of the present invention is an outer surface in which an annular first partition is provided on the inner peripheral surface of the front end as described in claim 1. Excavation in which the shell and the inner shell supported by the first partition of the outer shell so as to be able to be pulled out are integrally provided with the second partition, and the cutter plate rotation driving means is mounted on the second partition. A tunnel excavator comprising a machine main body and a cutter plate that is rotatably supported by the second partition wall and excavates the front ground of the outer shell body, and forms a pipeline in the excavation site while excavating the tunnel in the ground. After that, the excavator main body is recovered through the pipe, and after the excavation of the tunnel of a predetermined length is completed, the inner shell is disconnected from the outer shell and the cutter plate is attached to the first partition wall. Reduced by reducing the outer diameter to allow passage An excavator is attached to at least two places on the lower peripheral portion of the outer peripheral end of the plate after having a sled member formed on a tapered surface inclined upward as the rear portion goes to the rear end with a predetermined interval in the circumferential direction. Pulling the main body backward and sliding the sled member on the inner peripheral surface of the first partition wall, the cutter plate is passed through the first partition wall, and the excavator main body and the cutter plate are integrally collected through the pipeline. It is characterized by doing.

  In the excavator body recovery method in the tunnel excavator configured as described above, the invention according to claim 2 is that the cutter plate is provided radially from the center of rotation toward the outer diameter direction, and a plurality of excavation bits are provided on the front surface. By connecting the outer ends of the plurality of spoke bodies protruding in a circular arc shape along the inner peripheral surface of the first partition wall, the diameter is smaller than the inner diameter of the first partition wall. A cutter plate portion, and an outer spoke body that protrudes from the outer end of each spoke body in the cutter plate portion so as to be able to protrude and removably in the extending direction and has a plurality of excavation bits protruding from the front surface. The outer spoke body is immersed in the spoke body or removed from the spoke body to reduce the cutter plate, and the small diameter in a state of being held in the first partition wall via a sled member. Characterized by mounting a guide roller that the inner bottom surface on which the rolling of the outer shell tube from the inner bottom surface of the at least the lower peripheral surface sides of the cutter plate.

  Furthermore, in the invention according to claim 3, the warp member is formed in a tapered surface that is longer than the width between the front and rear end surfaces of the arcuate frame member of the cutter plate and is inclined upward as the rear part goes to the rear end. A plane rectangular warpage piece and a rectangular connecting piece that is longer than the width between the front and rear end faces of the arcuate frame member of the cutter plate, and the warp piece and the connecting piece are connected to the arcuate frame member. Arranged on the outer peripheral surface side and the inner peripheral surface side at a predetermined portion, and is detachably attached to the arc-shaped frame member by connecting between the front end portion and the rear end portion protruding in the front-rear direction from the arc-shaped frame member with bolts It is constructed so that it can be attached to.

  In the invention according to claim 4, a plurality of guide rollers capable of rolling in the front-rear direction on the inner peripheral surface of the outer shell body are rotatably supported at the front and rear portions of the outer shell surface of the inner shell body. A connecting member that integrally connects the inner shell body to the inner peripheral surface of the outer shell body is detachably disposed on the rear end face with an interval in the circumferential direction.

  According to the excavator body recovery method in the tunnel excavator of the present invention, when the excavator body is recovered, the cutter plate passes through the annular first partition wall integrally provided on the inner peripheral surface of the front end portion of the outer shell body. After reducing the outer diameter to a possible outer diameter, at least two locations on the lower peripheral part of the outer peripheral end of the reduced cutter plate are inclined upward as the rear part goes to the rear end with a predetermined interval in the circumferential direction. When the excavator body is pulled backward and the front end of its inner shell is separated from the first partition wall backward, the weight of the cutter plate is attached. As a result, the center of gravity of the entire excavator body moves to the front side, and the inner shell body becomes an unstable posture that tilts downward in a forward bent shape. The rear edge of the plate reaches the front edge of the opening of the first partition Then, the lower surface of the rear end of the slanting member that is inclined upward enters the first partition so that the lower surface of the first partition is on the opening front edge of the first partition, and the rear end of the cutter plate is moved to the second end. The cutter plate can be smoothly and reliably received in the first partition without contacting the front end of the one partition.

  Therefore, in this state, the shaft core of the excavator body can be held in a stable posture with the cutter plate accurately aligned with the center line of the outer shell, and by further pulling the excavator body from this state Collection work through the pipe line can be efficiently performed while pulling the cutter plate backward from the first partition.

  Further, according to the invention of claim 2, after the cutter plate is reduced, the cutter plate is positioned in the first partition wall via the sled member by pulling the excavator body, Since the guide rollers are mounted on at least both sides of the lower peripheral surface of the small-diameter cutter plate, the heavy cutter plate is supported by the guide roller, and the excavator body tilts in a forward bent manner due to the weight of the cutter plate. It can be eliminated reliably, and the excavator body can be smoothly collected and removed together with the cutter plate while keeping the excavator body in a stable posture. In addition, transporting work etc. when used again is relatively safe and easy. Can be done.

  According to the invention of claim 3, the sled member is formed in a tapered surface that is longer than the width between the front and rear end surfaces of the arcuate frame member of the cutter plate and is inclined upward as the rear part goes to the rear end. And a rectangular connecting piece that is longer than the width between the front and rear end faces of the arcuate frame member of the cutter plate, and the warp piece and the connecting piece are connected to the arcuate frame member. Arranged on the outer peripheral surface side and the inner peripheral surface side at a predetermined portion, and is detachably attached to the arc-shaped frame member by connecting between the front end portion and the rear end portion protruding in the front-rear direction from the arc-shaped frame member with bolts Therefore, using the arcuate frame member of the cutter plate, the mounting operation of the sled member can be performed easily and reliably, and the removing operation can be easily performed.

  According to the invention according to claim 4, since a plurality of guide rollers that can roll in the front-rear direction on the inner peripheral surface of the outer shell body are rotatably supported on the outer peripheral surface front and rear portions of the inner shell body, Even if the length of the inner shell is short, the entire excavator body can be supported in a stable state together with the guide roller supporting the cutter head. Therefore, the outer shell is also the length of the inner shell. It can be shortened according to the length, and the direction control can be easily and accurately performed. Further, the excavator body can be reduced in weight and the handling property such as conveyance becomes easy. It is.

  In addition, since the connecting member that integrally connects the inner shell body to the inner peripheral surface of the outer shell body is detachably disposed on the rear end surface of the inner shell body at intervals in the circumferential direction. When the tunnel excavator is propelled by pushing the rear end face of the pipe that forms the pipe buried in the tunnel excavation wall from the shaft side, the propulsive force that is transmitted to the outer shell through the pipe is connected as described above. The tunnel can be dug while reliably transmitting to the inner shell that rotatably supports the cutter head via the member, and when the excavator body is recovered, the connecting member is removed for excavation. The machine body can be collected efficiently.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows that a pipe P is formed by propelling and embedding a pipe body p in the tunnel T while excavating the tunnel T by a propulsion method. FIG. 3 is a simplified longitudinal side view of a tunnel excavator, and the outer peripheral end surface of the annular first partition wall 2 having an inner diameter smaller than the inner diameter of the pipe P is integrally fixed to the inner peripheral surface of the front end portion. A cylindrical outer shell 1 having a thickness and an inner shell 4 supported by the first partition 2 of the outer shell 1 so as to be extractable, and an inner circumferential surface of the inner shell 4 in the longitudinal direction The excavator main body 3 in which the rotation driving means 7 of the cutter plate 6 is mounted on the second partition wall 5 whose outer peripheral end surfaces are integrally fixed to each other, and rotatably supported on the front surface of the second partition wall 5. A cutter plate 6 for excavating the front ground of the shell 1 and a means 8 for discharging excavated soil Eteiru.

  The outer peripheral surface of the front end portion of the short cylindrical support member 2 ′ is integrally fixed to the inner peripheral end surface of the first partition wall 2, while the inner shell body 4 of the excavator body 3 is the length of the outer shell body 1. The outer peripheral surface of a ring-shaped spacer member 4 ′ having a constant thickness, which is integrally fixed to the outer peripheral surface of the front end of the inner shell 4 The member 2 'is slidably supported on the circular inner peripheral surface. Note that the front outer peripheral surface of the inner shell 4 may be directly slidably supported by the support member 2 ′ without providing such a spacer member 4 ′.

  The outer shell 1 is formed so that its outer diameter is substantially equal to the outer diameter of the pipe P, and from the rear surface of the first partition 2 to the front end of the pipe P at the lower and upper peripheral portions of the inner peripheral surface. The roller guide members 10 and 10 having a constant width and having a height that reaches the top of the pipe P and a height that is flush with the inner peripheral surface of the pipe P are spaced apart in the circumferential direction. As shown in FIG. Then, the outer peripheral surface of the rear end portion of the short cylindrical support member 2 ′ fixed to the inner peripheral end surface of the first partition wall 2 is supported on the top surfaces of these roller guide members 10 and 10 via the support piece 2a. I am letting. It is not always necessary to provide these roller guide members 10 and 10 on the upper peripheral side of the outer shell 1.

  On the other hand, a pair of left and right guide rollers 11 that roll on the roller guide members 10 and 10 in the front-rear direction on the front and rear portions of the lower peripheral portion and the upper peripheral portion of the outer peripheral surface of the inner shell body 4 in the excavator body 3. , 11 are mounted in the circumferential direction at the same interval as the adjacent roller guide members 10 and 10, and the excavator body is mounted on the inner peripheral surface of the outer shell 1 by the guide rollers 11 provided at the front, rear, left and right. 3 is supported. The first partition wall 2 in which the short cylindrical support member 2 'is integrally fixed to the inner peripheral end face is provided with a notch 2b having a certain width in which the front guide rollers 11, 11 can intervene over the entire length. Formed.

  Further, the outer shell body 1 is divided into a long front outer shell portion 1a and a short rear outer shell portion 1b, and the rear end portion and the rear outer shell portion 1b of the front outer shell portion 1a are divided. The front end portion is bent in the vertical and horizontal directions via the bent portion 12 and the front end portion of the front outer shell portion 1a and the front end portion of the rear outer shell portion 1b are spaced at appropriate intervals in the circumferential direction. These are connected by a plurality of direction correcting jacks 13 arranged in the direction. Further, as shown in FIG. 3, fixed leg members whose height is slightly lower than the height of the support member 2 ′ fixed to the inner peripheral end surface of the first partition wall 2 on the four sides of the rear inner peripheral surface of the front outer shell portion 1 a. 14 is fixed to the fixed leg member 14, and a side L-shaped connection is made between the rear end surface of the inner shell 4 of the excavator body 3 and the top surface of the fixed leg portion 14 by a bolt or the like. The member 15 is detachably fixed.

  The cutter plate 6 for excavating the ground in front of the outer shell 1 has an outer diameter substantially equal to the outer diameter of the outer shell 1 during tunnel excavation, and the outer diameter of the cutter plate 6 when the excavator body 3 is recovered. 2 is configured so as to be smaller than the inner diameter of the short cylindrical support member 2 ′ and the inner diameter of the pipe P, and the lower peripheral portion at the outer peripheral end of the reduced cutter plate portion 6A is excavated. At the time of the recovery of the machine body 3, the sled members 9, 9 (see FIGS. 5 and 6) formed on the tapered surface inclined upward as the rear part goes to the rear end with a predetermined interval in the circumferential direction are attached. It is configured.

  Specifically, as shown in FIGS. 1 and 2, the cutter plate 6 has a plurality of lengths shorter than the inner diameter of the short cylindrical support member 2 ′ of the first partition wall 2 from the center of rotation toward the outer diameter direction. Four (4 in the figure) spoke bodies 6a1 project radially, and between the outer ends of adjacent spoke bodies 6a1 and 6a1 are formed in an arc shape along the inner peripheral surface of the support member 2 '. A cutter plate portion 6A connected by a curved frame member 6a2 and having a smaller diameter than the inner diameter of the support member 2 ', and an outer side protruding from the outer end of each spoke body 6a1 in this cutter plate portion 6A The spoke body 6b includes a plurality of excavation bits 6c projecting forward at predetermined intervals in the length direction on both sides of the front surface of the spoke bodies 6a1 and 6b. Note that the inner peripheral surface of the first partition wall 2 is formed by the inner peripheral surface of a short cylindrical support member 2 ′ which is integrally fixed to the inner peripheral end of the first partition wall 2.

  Each spoke body 6a1 of the small-diameter cutter plate portion 6A is formed in a hollow shape, the outer spoke body 6b is accommodated in the hollow, and the outer spoke body is provided by a jack (not shown) provided in the hollow spoke body 6a1. 6b is configured to protrude and retract freely from the spoke body 6a1, but it may be configured to removably fix the inner end surface of the outer spoke body 6b to the outer end surface of each spoke body 6a1, Or you may comprise so that folding is possible. The cutter plate is not limited to such a spoke-type cutter plate 6 and may be a cutter plate having a face plate structure.

  As shown in FIGS. 4 to 6, the sled member 9 attached to the lower peripheral portion of the small-diameter cutter plate portion 6A is longer than the width between the front and rear end faces of the arcuate frame member 6a2 on the cutter plate 6 and the rear portion is rear. A flat rectangular sled piece 9a formed on a convex arcuate tapered surface inclined upward (inner circumferential surface side of the arcuate frame member 6a2) toward the end, and an arcuate frame member of the small-diameter cutter plate portion 6A. A connecting piece 9b having a rectangular shape longer than the width between the front and rear end faces of 6a2, and the sled piece 9a is disposed in contact with the outer peripheral surface of the arcuate frame member 6a2 so as to sandwich a predetermined portion of the arcuate frame member 6a2. In addition, the connecting piece 9b is disposed in contact with the inner peripheral surface of the arcuate frame member 6a2, and the warp piece 9a projecting in the front-rear direction from the front and rear end faces of the arcuate frame member 6a2 and the front end of the connecting piece 9b and the rear With several bolts 9c between the ends By connecting, the sled member 9 is detachably attached to a predetermined portion of the arcuate frame member 6a2.

  In a state in which the sled member 9 is attached to the arcuate frame member 6a2, the bottom surface of the sled piece 9a is higher than the inner peripheral surface of the first partition wall 2 with respect to the inner peripheral surface of the support member 2 'of the first partition wall 2. The thickness of the sled piece 9a is set so that the height position is equal to the height. When the excavator body 3 is recovered, the sled members 9 and 9 are arranged such that the spoke body 6a1 is centered on the arcuate frame members 6a2 and 6a2 connected to both end surfaces of the spoke body 6a1 vertically downward. It is attached to both sides with a predetermined interval, and further, the sled members 9, 9 are detachably attached to positions at a predetermined interval upward from the pair of sled members 9, 9. It is composed. Further, in front of the left and right guide rollers 11, 11 attached to the lower peripheral portion of the outer peripheral surface of the inner shell body 4 of the excavator body 3 in the vicinity of the outside of the pair of left and right sled members 9, 9 on the lower side. As shown by a two-dot chain line in FIG. 5, a pair of left and right guide rollers 16 and 16 having the same diameter as those guide rollers 11 and 11 are mounted on the lower peripheries of the spoke bodies 6a1 and 6a1 facing each other. It is composed.

  The rotational drive means 7 of the cutter plate 6 includes a drive motor 7a mounted on the outer peripheral portion of the back surface of the second partition wall 5 in the excavator body 3, and an inner periphery of the front end portion of the inner shell body 4 on the front surface side of the second partition wall 5. Rotating ring member 7b rotatably supported on the surface, ring-shaped internal gear 7c fixed integrally to the rear surface of the rotating ring member 7b, and rotation of the drive motor 7a penetrating the second partition wall 5 It consists of a small gear 7d fixed to the shaft and meshed with the internal gear 7c, and protrudes rearward on the outer peripheral portion of the rear surface of each spoke body 6a1 forming the small-diameter cutter plate portion 6A of the cutter plate 6. The provided arm member 6e is integrally fixed to the front surface of the rotating ring member 7b, and the cutter plate 6 is rotated by the operation of the drive motor 7a of the rotation driving means 7. In addition, a front end of a rotation center shaft 6 d that is rotatably supported at the center of the second partition wall 5 is integrally provided at the rotation center of the cutter plate 6.

  Further, a space between the rear surface of the cutter plate 6 and the front surface of the second partition wall 5 is formed in the earth and sand chamber 17 in which the earth and sand excavated by the cutter plate 6 is taken and temporarily retained, and the second partition wall 5 is formed. The earth and sand intake port 24 that faces the lower end of the earth and sand chamber 17 is provided at the lower part of the earth and sand chamber. The earth and sand intake port 24 is connected to the front end opening of the earth and sand discharge means 8 composed of a screw conveyor. The excavated sediment is discharged backward from the chamber 17 through the sediment discharge means 8.

  Further, in the embodiment of the present invention, as shown in FIGS. 1 and 3, a plurality of sheets having a shape obtained by dividing the cylindrical body into a plurality of parts in the circumferential direction on the outer peripheral surface of the front outer shell portion 1a of the outer shell body 1 are provided. A movable hood 18 is slidably disposed in the front-rear direction, and the movable outer hood 18 covers the front outer shell portion 1a, and the inner peripheral surface of the front outer shell portion 1a is attached to each movable hood 18. Correspondingly, a cylindrical frame 20 having a hood operating jack 19 disposed therein is arranged, and a movable hood in which the front end of the cylindrical frame 20 projects forward from the front end of the front outer shell portion 1a. 18 is integrally connected to the inner peripheral surface of the front end portion, and the front end of the hood operating jack 19 is connected to the inner surface of the front end portion of the cylindrical frame 20, and the rear end is connected to the inner peripheral surface of the rear outer shell portion 1a. By connecting to the protruding bracket 21 and extending the hood actuating jack 19, each jack The movable hood 18 to protrude forward are configured to driven into the ground. The front end portion of each cylindrical frame 20 is slidably held in the front-rear direction on the outer peripheral surface of the support member 2 ′ of the first partition wall 2 and the inner peripheral surface of the outer shell body 1.

  Next, in order to construct the pipeline P in the ground by the tunnel excavator configured as described above, first, the tunnel excavator is installed in a start shaft (not shown) and a fixed length of fume pipe or the like. The rotating body 8 is connected to the rear end surface of the rear outer shell portion 1b of the outer shell body 1 and the outer spoke body 6b protrudes outward to make the cutter plate 6 larger in diameter. The tunnel excavator is grounded by operating it to rotate the cutter plate 6 and pushing the rear end face of the pipe body p by propulsion means (not shown) comprising a plurality of propulsion jacks arranged in the start shaft. Dig in.

  Then, when the tunnel excavator propels for a certain length from the start shaft into the ground, the front end of the next pipe p is connected to the rear end of the pipe p, and the rear end of the pipe p is pushed forward by the propulsion means. The tunnel excavator is further excavated along the tunnel plan line while the head pipe p is followed by the pipe p. Hereinafter, every time a tunnel of a certain length is excavated by the tunnel excavator, the pipe is formed on the start shaft side. The body p is sequentially pushed forward while being connected to form the pipe line P.

  The propulsive force by the propulsion means is transmitted from the pipe body p to the inner shell body 4 through the rear outer shell portion 1b of the outer shell body 1, the direction correcting jack 13, the front outer shell portion 1a, and the connecting member 15. 1 and the excavator main body 3 are integrally propelled to excavate the ground in front by the cutter plate 6. The earth and sand excavated by the cutter plate 6 is taken into the earth and sand chamber 17 and discharged by the earth and sand discharging means 8. When the direction of the tunnel excavator is corrected or the curved tunnel portion is excavated while the tunnel T is being excavated, the front outer shell portion 1a is operated with respect to the rear outer shell portion 1b by operating the direction control jack 13. Is refracted in a predetermined direction.

  When this tunnel excavator reaches the existing tunnel T ′ so as to intersect the existing tunnel T ′ shown by the two-dot chain line in FIG. 1, excavation is performed in a state where the cutter plate 6 is close to the outer peripheral surface of the existing tunnel T ′. After stopping the hood operation, the hood actuating jacks 19 are sequentially extended so that each movable hood 18 is driven from the outer periphery of the cutter plate 6 to the front ground, and the tip thereof is brought into contact with the outer peripheral wall surface of the existing tunnel T ′. The existing tunnel where the ground surrounded by the movable hood 18 and the outer ground are cut off, and then the ground surrounded by the movable hood 18 is excavated and removed, and the tip of the movable hood 18 abuts. By disassembling the outer peripheral wall surface of T ′, the pipe P is communicated with the existing tunnel T ′ in a state branched from the existing tunnel T ′.

  In this way, after the pipe P is branched from the existing tunnel T ′, the excavator body 3 in the tunnel excavator is transferred to the start shaft side through the pipe P. In the case where the excavator body 3 is recovered after the pipe P having a predetermined length that has reached a narrow reach shaft or the like is constructed by the tunnel excavating machine without branching the pipe P to the existing tunnel T ′. The outer shell 1 need not be provided with the movable hood 18 or the hood operating jack 19 as described above. Moreover, although the pipe line P is formed by adding the pipe body p sequentially, you may form it by assembling a segment to a tunnel excavation surface. In this case, as is well known, a plurality of propulsion jacks are mounted at appropriate intervals in the circumferential direction in the tunnel excavator, and the propulsion jacks are attached to the front end face of the pipe line made of the segment lining. It is configured to dig a tunnel by taking reaction force and propelling it.

  A method of recovering and removing the excavator body 3 from the tunnel P through the tunnel P after excavating a predetermined length of tunnel with a tunnel excavator will be described. First, the excavator body The earth and sand discharging means 8 composed of a screw conveyor attached to the second partition wall 5 is removed, and is collected and removed through the pipe P to the start shaft side. The collection operation of the earth and sand discharge means 8 can be performed on a carriage that runs on a rail for moving a subsequent carriage that is disposed in advance at the inner bottom of the pipe P. Moreover, after removing this rail, you may mount on the roller trolley | bogie which drive | works on the inner bottom face of the pipe line P. FIG. By doing so, a wide movement space can be taken and the transportability is improved.

  The cutter plate 6 rotatably supported by the second partition wall 5 of the excavator body 3 is accommodated in the hollow spoke body 6a1 while the earth and sand discharging means 8 are collected and the rail is removed, or the outer spoke body 6b is accommodated in the hollow spoke body 6a1. By removing the outer spoke body 6b, the cutter plate portion 6A having an outer diameter slightly smaller than the inner diameter of the short cylindrical support member 2 ′ of the first partition wall 2 is obtained as shown in FIG. Thereafter, the arcuate frame members 6a2 and 6a2 connected to both side portions of the lower peripheral portion of the cutter plate portion 6A, that is, both side end surfaces of the spoke body 6a1 directed downward vertically as shown in FIGS. In addition, the sled members 9, 9 are attached with a predetermined interval in the circumferential direction. In this mounting operation, the sled piece 9a and the connecting piece 9b are arranged on the outer surface side and the inner surface side of the spoke body 6a1, and a predetermined portion of the frame member 6a2 is sandwiched between the sled piece 9a and the connecting piece 9b. By connecting the end portions projecting from the frame member 6a2 in the front-rear direction with the bolts 9c, it can be performed easily and firmly.

  The connecting member 15 that connects and fixes the excavator body 3 to the outer shell 1 is removed together with the mounting operation of the plurality of sled members 9 to the lower peripheral portion of the small-diameter cutter plate portion 6A. In addition, when the earth and sand stirring bar 22 which becomes obstructive to collection | recovery of the excavator main body 3 is provided in the back side of the cutter board part 6A, this earth and sand stirring bar 22 is also removed.

  After that, when a tow rope (not shown) is connected to a bracket 23 or the like protruding from the rear end of the second partition wall 5 of the excavator body 3 and pulled backward, the excavator body 3 has its inner shell. The guide roller 11 mounted on the outer peripheral surface of the body 4 is moved backward while rolling on the roller guide member 10 provided on the inner peripheral surface of the outer shell 1, and the first partition 2 has a short cylindrical shape. The front part supported by the support member 2 ′ is moved from the support member 2 ′ while sliding the spacer member 4 ′ mounted on the outer peripheral surface of the front end rearward on the inner peripheral surface of the support member 2 ′. Leave backwards.

  Immediately after the front end portion of the excavator body 3 is detached from the support member 2 ′ of the first partition wall 2, the back surface of the cutter plate portion 6 </ b> A that retreats integrally with the excavator body 3 reaches the front vicinity of the first partition wall 2. However, the guide roller is not supported on the support member 2 'of the first partition wall 2, and therefore the excavator body 3 is mounted on the front side of the lower peripheral portion by the weight of the cutter plate portion 6A. 11, the rear end portion of the inner shell 4 moves upward so as to eliminate play of the bearing portion of the guide roller 11 mounted on the outer peripheral surface of the rear end portion, and the excavator body 3 bends slightly forward. The situation in which the center of the cutter plate portion 6A is shifted downward with respect to the center of the support member 2 'of the first partition wall 2 and the lower end of the cutter plate 6A is moved downward with respect to the front of the lower end of the support member 2'. However, even if such a situation occurs, the excavator body 3 is pulled backward as it is. 8 and FIG. 9, the lower surface of the slanting member 9 that is inclined upward is brought into contact with the front end edge of the inner peripheral surface of the lower peripheral portion of the support member 2 ′ of the first partition wall 2. Ride on the inner peripheral surface of the support member 2 '.

  In this state, the excavator body 3 is held in an accurate posture in which the center of the excavator body 6A and the center of the outer shell body 1 coincide with the cutter plate portion 6A. Let And the space part of the notch parts 2b and 2b of the cylindrical support member 2 'in the first partition wall 2 in which the pair of left and right guide rollers 11 and 11 mounted on the front side of the lower peripheral part of the excavator main body 3 is interposed. 9, guide rollers 16 and 16 are attached to arcuate frame members 6a2 and 6a2 in the lower peripheral portion of the cutter plate portion 6A facing the notches 2b and 2b as shown in FIG. These guide rollers 16, 16 are arranged to roll on the front end portions of the roller guide members 10, 10 of the left and right guide rollers 11, 11 attached to the lower peripheral portion of the inner shell body 4 of the three.

  After that, when the excavator body 3 is pulled again, the guide rollers 11 and 16 roll on the roller guide members 10 and 10 to move the cutter plate portion 6A together with the excavator body 3 toward the pipe P side. When these guide rollers 11, 16 reach the front end of the conduit P that is flush with the top surfaces of the roller guide members 10, 10 from above the roller guide members 10, 10, as shown in FIGS. The roller guide member 10 continuously rolls on the inner peripheral surface of the pipe P to collect the cutter plate 6A together with the excavator body 3 to the start shaft side. At the time of this recovery, the cutter plate portion 6A is supported by the guide rollers 16 and 16, so that it can be recovered smoothly with a stable posture together with the excavator body 3 supported by the guide rollers 11 and 11. .

  The recovered excavator body 3, cutter plate 6A, earth and sand discharging means 8 and the like are used again at the time of the next tunnel construction, and the outer shell 1 is left buried in the tunnel excavation wall. The direction control jack 10 attached to the outer shell 1 is also removed and removed to enable reuse.

A longitudinal side view of a tunnel excavator. The front view of a cutter head. The rear view of the tunnel excavator which cut a part. The exploded perspective view of a sled member. FIG. 4 is a partially omitted front view of a small diameter cutter plate. The side view which carried out the cross section of the part which attaches a sled member and shows the time of collection | recovery start. FIG. FIG. 5 is a partial vertical side view of the sled member just before riding on the first partition wall. The side view which carried out the cross section of a part of the state which mounted the sled member on the supporting member of the 1st partition. The side view which sectioned a part in the middle of collection of an excavator main part. Side view of a section of the pipe that is being collected.

Explanation of symbols

T tunnel P pipeline 1 outer shell 2 first bulkhead 3 excavator body 4 inner shell 5 second bulkhead 6 cutter plate
6A Small-diameter cutter plate part 7 Rotation drive means 8 Excavation sediment discharge means 9 Sledge member
10 Roller guide member
11 Guide roller
15 Connecting member
16 Guide roller

Claims (4)

  An outer shell body in which a ring-shaped first partition wall is provided on the inner peripheral surface of the front end portion, and a second partition wall is integrally provided in an inner shell body that is supported by the first partition wall of the outer shell body so that it can be pulled out. Tunnel excavation comprising an excavator body in which a cutter plate rotation driving means is mounted on the second partition, and a cutter plate that is rotatably supported by the second partition and excavates the front ground of the outer shell. After excavating a tunnel in the ground with a machine, a pipe is formed in the excavation site, and then the excavator body is recovered through the pipe, and after the completion of excavation of a predetermined length of tunnel, A predetermined interval exists in the circumferential direction in at least two places on the lower peripheral portion of the outer peripheral edge of the cutter plate that is reduced by reducing the outer diameter of the cutter plate by releasing the inner shell and reducing the cutter plate to the outer diameter that can pass through the first partition wall. And the rear part tilts upward as it goes to the rear edge. After attaching the sled member formed on the tapered surface, pull the excavator body backward and slide the cutter member on the inner peripheral surface of the first partition wall, passing the cutter plate through the first partition wall. A method for recovering an excavator body in a tunnel excavator, wherein the excavator body and the cutter plate are integrally recovered through a pipe line.   The cutter plate is provided radially from the center of rotation toward the outer diameter direction, and extends along the inner peripheral surface of the first partition between the outer ends of the plurality of spoke bodies projecting a plurality of excavation bits on the front surface. As shown in the figure, the cutter plate is connected by a frame member that is curved in a circular arc shape and has a diameter smaller than the inner diameter of the first partition wall, and the cutter plate can be removed from the outer end of each spoke body in the extending direction or removable. And an outer spoke body formed by projecting a plurality of excavation bits on the front surface. The outer spoke body is immersed in or removed from the spoke body to reduce the cutter plate, A guide roller that rolls from the inner bottom surface of the outer shell to the inner bottom surface of the tubular body is mounted on at least both sides of the lower peripheral surface of the small-diameter cutter plate while being held in the first partition through the member. To do Recovery process of the excavator main body in a tunnel boring machine according to claim 1, wherein.   The sled member is a planar rectangular sled piece that is formed in a tapered surface that is longer than the width between the front and rear end surfaces of the arcuate frame member of the cutter plate and is inclined upward as the rear part goes to the rear end. The arc-shaped frame member is formed of a rectangular connecting piece longer than the width between the front and rear end faces, and the warp piece and the connecting piece are connected to an outer peripheral surface side and an inner peripheral surface side in a predetermined portion of the arc-shaped frame member. And a front end portion and a rear end portion that project from the arc-shaped frame member in the front-rear direction and are connected to each other by bolts, and are detachably attached to the arc-shaped frame member. A method for recovering an excavator body in the tunnel excavator according to claim 1.   A plurality of guide rollers that can roll in the front-rear direction on the inner peripheral surface of the outer shell are rotatably supported at the front and rear portions of the outer peripheral surface of the inner shell, and the rear end surface is spaced circumferentially. The excavator in a tunnel excavator according to claim 1 or 2, wherein a connecting member in which the inner shell is integrally connected to the inner peripheral surface of the outer shell is detachably disposed. How to recover the main body.

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