JP4698395B2 - Excavator body recovery device in tunnel excavator - Google Patents

Description

The present invention relates to a recovery apparatus for recovering an excavator body in a tunnel excavator through the tunnel lining body after excavating a tunnel in the ground with a tunnel excavator and constructing the tunnel lining body on the excavation wall surface.

  When excavating a tunnel using the propulsion method or shield method in the ground, the tunnel excavator is excavated from the starting shaft side toward the reaching shaft, and every time a certain length of tunnel is excavated, the tunnel excavator is followed by a constant value. A tunnel excavator that has reached the final shaft after the tunnel lining body is formed by sequentially adding long buried pipes or by assembling segments on the excavation wall surface, is usually recovered from the final vertical shaft to the ground. However, if the reaching shaft is not provided due to existing human holes on the arrival side, or if it cannot be recovered through the reaching shaft, the tunnel excavator will be Must be dismantled and removed to the start shaft through the tunnel lining and recovered.

  For this reason, as described in Patent Document 1, in a tunnel excavator that forms a tunnel lining body by sequentially burying pipes in the tunnel while excavating the tunnel in the ground, A cylindrical outer shell having substantially the same outer diameter as the tunnel lining body, and an excavator body disposed in the outer shell. The excavator body has a smaller diameter than the tunnel lining body. The inner shell is connected to and supported by the outer shell so that it can be pulled out rearward, and the outer diameter of the bulkhead provided integrally with the front portion of the inner shell is tunnel lining. A tunnel excavator having a cutter head that is smaller than the inner diameter of the body is rotatably supported, and further includes a driving means for the cutter head and a means for discharging excavated earth and sand excavated by the cutter head. It was.

Then, when the tunnel is excavated to a predetermined length by a tunnel excavator while constructing and forming the tunnel lining body on the tunnel excavation wall surface, the excavating sediment discharging means is collected and removed through the tunnel lining body and the cutter head is covered with the tunnel. Reduce the diameter until the inner diameter is smaller than the inner diameter of the work body, disconnect the inner shell from the outer shell, and install a guide roller on the lower peripheral surface of the rear end of the inner shell, then leave the outer shell on the excavation wall In this state, the excavator body is pulled backward to roll the guide roller and the guide roller previously mounted on the lower peripheral surface of the front end of the inner shell on the inner bottom surface of the tunnel covering body. The excavator body is recovered toward the start shaft.
JP 2004-346688 A

  However, according to the excavator body recovery method in the tunnel excavator as described above, the excavator body is supported by the front and rear guide rollers mounted on the lower peripheral surface of the front and rear ends of the inner shell, and these guide rollers are Since it is collected while rolling on the inner bottom surface of the tunnel lining body, the large load of the excavator body is moved inside the tunnel lining body constructed by these guide rollers rolling through the front and rear guide rollers. There is a possibility that the tunnel lining body may be cracked or damaged to cause inconvenience due to the concentrated action on the bottom surface.

The present invention has been made in view of such problems, and the purpose of the present invention is to provide a tunnel in which the excavator body can be reliably recovered without causing cracks or damage to the constructed tunnel lining body. It is in providing the collection | recovery apparatus of the excavator main body in an excavator.

In order to achieve the above object, the excavator body recovery device in the tunnel excavator of the present invention starts the tunnel excavator from the start side and tunnels into the ground by the tunnel excavator as described in claim 1. The tunnel lining body is constructed on the excavation wall surface while excavating the tunnel, and after excavating the tunnel for a predetermined length, the excavator body equipped with the cutter plate in the tunnel excavator and the driving means for the cutter plate is started through the tunnel lining body A receiving base that is curved in an arc shape in the circumferential direction along the inner bottom surface of the tunnel lining body and has an upper surface formed on the mounting surface of the excavator body, The levitation means is mounted on the lower surface of the base, and the levitation means is surrounded by an elastically inflatable and contractible ring-shaped bag mounted on the lower surface of the base, and the bag. Pressure flow into and out of space An inner bottom surface of the tunnel covering body when the bag of the levitation means is contracted to the four sides of the lower surface of the cradle between the levitation means adjacent to both sides. Wheels that roll in contact with the top and move the cradle in the tunnel length direction are rotatably mounted .

In the excavator body recovery device in the tunnel excavator configured as described above, the invention according to claim 2 is characterized in that a rolling prevention means is provided on the outer peripheral surface of the excavator body placed on the cradle. To do. As this rolling prevention means, rollers mounted on both sides of the outer peripheral surface of the excavator main body and rolling in the tunnel length direction while being pressed against the tunnel covering body by a spring force are employed.

According to the first aspect of the present invention, the excavator body recovery device is equipped with a fluid pressure levitating means on the lower surface of the cradle that is curved in an arc shape in the circumferential direction along the inner bottom surface of the tunnel lining body. Therefore, the tunnel lining at the rear of the tunnel excavator from the starting side through the tunnel lining after the tunnel excavation of a predetermined length by the tunnel excavator is possible. Excavator placed on a cradle by being able to be easily carried to the inner bottom surface of the body and smoothly preparing for recovery of the excavator body and supplying pressure fluid to the levitation means The main body can be lifted together with the cradle so that it can be easily collected.

  Further, the excavator main body is collected by pulling the cradle on which the excavator main body is placed in a state where the excavator main body is lifted by the fluid pressure levitation means toward the starting side. Despite this, it can be recovered smoothly and efficiently with a very small traction force while being pulled toward the start side, and the inner bottom surface of the tunnel lining body is the cradle on which the excavator body is placed. Since the sliding contact force or concentrated load due to movement is hardly received, the excavator body can be recovered without causing cracks or damage to the tunnel lining body. In addition, since the excavator body placed on the cradle is recovered while preventing rolling, the excavator body can be reliably recovered while always maintaining a stable posture.

The fluid pressure levitation means includes a ring-shaped bag that is elastically expandable and contractible, and a pipe that supplies pressure fluid from a pressure fluid supply source to the inside of the bag and a space surrounded by the bag. Since this bag is mounted on the bottom four sides of the cradle, even if the center of gravity of the excavator body placed on the cradle is biased, By adjusting the amount of pressure fluid supplied to the bottom of the excavator body, the bottom surface of the cradle can be lifted easily and accurately so that it is at a certain height from the inner bottom surface of the tunnel lining body. In addition to being able to support, pressure fluid is supplied to the space surrounded by the ring-shaped inner peripheral surface of each bag, so the cradle on which the excavator body is placed is levitated by the fluid pressure filled in the space And one of the pressure fluids Flows out of the space and forms a fluid film between the lower surface of the bag and the inner bottom surface of the tunnel lining body, and the cradle is placed in a state where the frictional resistance received from the inner peripheral surface of the tunnel lining body is cut off. It can be easily recovered toward the starting side while smoothly sliding on the fluid film.

Further, the lower surface square of the cradle between the flotation means adjacent to the both sides, tunnels length cradle to roll in contact on the inner bottom surface of the tunnel lining member when the bag flotation means deflated Since the wheel to be moved in the vertical direction is rotatably mounted, after excavating the tunnel of a predetermined length by the tunnel excavator, when recovering the excavator body to the starting side, this wheel is attached to the tunnel lining body. The cradle can be easily carried in from the start side to the rear position of the tunnel excavator while rolling on the inner bottom surface, and when the bag contracts unexpectedly during collection, the cradle is connected via this wheel. Since the load on the side can be supported on the tunnel lining body , damage to the bag can be reliably prevented.

According to the invention of claim 2 , since the rolling preventing means is provided on the outer peripheral surface of the excavator body placed on the cradle, the cradle on which the excavator body is placed together with the excavator body. This rolling prevention means can prevent the tunnel lining body from moving around in the circumferential direction. Therefore, the excavator body can be accurately moved toward the start side while supporting the excavator body in a stable state on the cradle. Can do.

Such rolling prevention means is composed of rollers mounted on both sides of the outer peripheral surface of the excavator body, and is configured to roll this roller in the tunnel length direction while being pressed against the tunnel covering body by a spring force. Therefore, in the rolling direction, the roller can be locked to the tunnel covering body to reliably prevent the occurrence of rolling, and in the tunnel length direction, the roller can be connected to the tunnel covering body. The excavator body on the cradle can be smoothly moved and collected toward the start side while rolling up.

  Further, as described above, the excavator main body is collected in a state where the cradle on which the excavator main body is placed is levitated by the levitation means. At that time, the excavator main body moves in the left-right direction and shocks the roller. Pressure and vibration force may act, but such impact force and vibration force can be reliably absorbed by the spring force of the spring while preventing the tunnel lining body from being damaged by the roller. The excavator body can be recovered.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a state where an excavator body 10 to be recovered in a tunnel excavator is placed on a recovery device A, and FIG. As shown in FIGS. 3 to 5, the recovery device A of the excavator body 10 is curved in an arc shape in the circumferential direction along the inner bottom surface of the tunnel lining body 30 constructed on the tunnel excavation wall surface. A flat rectangular cradle 1 having an upper surface formed on the mounting surface of the excavator body 10 and having a certain width and length, and a levitation means 2 mounted on four sides of the lower surface of the cradle 1. Further, a wheel 3 that rolls in the tunnel length direction is pivotally supported on the four sides of the lower surface of the cradle 1 between the levitation means 2 adjacent to both sides.

  The structure of the cradle 1 will be described in more detail. The excavator main body is curved in a concave arc shape from both side ends toward the center with the same curvature as the outer peripheral surface of the inner shell 11 described later of the excavator main body 10. Two support frames having a fixed length formed on support surfaces 1a and 1b that support the front and rear lower peripheral surfaces of 10 and having a lower surface curved in an arc along the inner bottom surface of the tunnel covering 30. 1A and 1B are arranged in parallel with an interval in which the excavator body 10 can be placed on the front and back, and several (3 in the figure) are provided between both sides of the front and rear support frames 1A and 1B. Connecting frames 1C made of I-shaped steel are arranged in parallel, and both front and rear end faces of these connecting frames 1C are integrally fixed to opposite faces of the front and rear support frames 1A and 1B by welding or the like, and are arranged side by side at least on both sides. The upper surface of one connecting frame 1C in the connecting frames 1C, 1C It is formed on a support surface 1c that supports both sides of the lower peripheral portion of 0.

  Furthermore, the downward U-shaped inner frames 1D and 1D, the upper surfaces of which are formed on the support surface 1d of the excavator body 10 on the inner side of the both side connecting frames 1C and 1C, are arranged in parallel to each other and the front and rear end surfaces thereof are arranged. Like the two-sided connecting frames 1C and 1C, the front and rear support frames 1A and 1B are integrally fixed to the opposing surfaces of the front and rear support frames 1A and 1B by welding or the like. A plurality of projecting pieces 1E having a pulling hole 1e at the center are fixed.

  On the other hand, the fluid pressure levitation means 2 mounted on the four sides of the lower surface of the cradle 1 configured as described above is connected to and communicates with a rubber ring bag 2A that is elastically expandable and contractible, and the bag 2A. Then, a pipe line 2B composed of a pipe for supplying a pressure fluid from a pressure fluid supply source (not shown) into the bag 2A, and a space 2C branched from the pipe line 2B and surrounded by the bag 2A And a branch pipe 2B ′ for supplying a pressure fluid to the pipe. As the pressure fluid, liquid can be used in addition to high-pressure compressed air. In this embodiment, high-pressure compressed air is used, and the bag will be described as an airbag 2A.

  These ring-shaped airbags 2A are integrally fixed to the lower surface of a mounting plate 2D made of a metal plate fixed to the four sides of the lower surface of the cradle 1 over the entire circumference. When the lower peripheral portion of 2A is in close contact with an airtight sheet 4 made of a synthetic resin sheet such as a laid iron plate or a vinyl sheet laid on the inner bottom surface of the tunnel lining 30 described later, the mounting plate 2D The space 2C surrounded by the facing surface of the seat 4 and the airbag 2A is configured as a pressure chamber filled with compressed air.

  Wheels 3 arranged on the bottom four sides of the cradle 1 are rotatably supported on the front and rear portions of the inner frames 1D and 1D, and when the airbag 2A is inflated and lifts the cradle 1 The wheels 3 are also lifted upward from the inner bottom surface of the tunnel lining body 30 or the seat 4 laid on the inner bottom surface, and the airbag 2A is contracted or in a contracted state. Is arranged so as to roll in contact with the inner bottom surface of the tunnel covering body 30 or the sheet 4 laid on the inner bottom surface. In the state where the wheel 3 is on the inner bottom surface of the tunnel covering body 30 or the seat 4, the airbag 2 </ b> A is provided between the lower surface of the cradle 1 and the inner bottom surface of the tunnel covering body 30 or the seat 4. Is configured to form a gap that can be stored in a contracted state.

  On the other hand, as shown in FIG. 6, a tunnel excavator that excavates a tunnel from a start side shaft has an outer shell 20 made of a cylindrical steel pipe having an outer diameter substantially the same as the tunnel excavation diameter, The outer peripheral end face is integrally fixed to the inner peripheral surface of the front end portion of the shell 20 by welding or the like, and a circular hole 21 having a diameter smaller than the inner diameter of the tunnel lining body 30 constructed on the tunnel excavation wall surface is provided in the central portion. An annular plate-shaped support wall 22, an excavator body 10 that is supported by the circular hole 21 of the support wall 22 so that it can be pulled out rearward and includes a cutter head 13, and the length of the outer shell 20. It has a structure including a plurality of direction-correcting middle-folding jacks 23 disposed at regular intervals in the circumferential direction in the middle portion in the vertical direction, and a screw conveyor 24 as excavating earth and sand discharging means.

  The outer shell 20 has an outer cylinder 20a having a constant length over the entire length that is equal to the outer diameter of the tunnel covering body 30, and an inner diameter on the inner peripheral surface of the outer cylinder 20a. It has a double cylinder structure in which the front end and the rear end of the inner cylinder part 20b equal to the inner diameter of the tunnel lining 30 are integrally connected by annular front and rear connection plates 20c and 20d. At the same time, it is divided into a front half part and a rear half part, and the divided opposing part is formed in the middle folding part 25, and the front half part is refracted in a predetermined direction by the operation of the middle folding jack 23 with respect to the front end of the rear half part. It is configured.

  Further, the excavator body 10 has a circular hole in the support wall 22 through the seal member 12 on the outer peripheral surface of the short cylindrical inner shell 11 formed with a diameter smaller than the inner diameter of the tunnel covering body 30. A partition wall 14 is provided in the front portion of the inner shell 11 so that the outer peripheral end face is integrally fixed to the inner peripheral surface of the inner shell 11. The rotating shaft 15 of the cutter head 13 is rotatably supported at the center of the partition wall 14. Further, a recovery wheel capable of rolling on the inner peripheral surface lower peripheral portion of the inner cylindrical portion 20b of the outer shell 20, that is, on the inner bottom surface of the outer shell 20, on both front side portions on the outer peripheral bottom surface of the lower peripheral portion of the inner shell 11. 16 is mounted, and the inner shell 11 is centered by the center of the circular hole 21 by the recovery wheel 16 and the propulsive force transmitting member 5 detachably connected to both sides of the rear end of the inner shell 11. 2 and 7 on both sides of the outer peripheral surface of the inner shell 11 of the excavator body 10 as shown in FIG. 2 and FIG. 6 is provided.

  The rolling prevention means 6 includes a short cylindrical body 6a whose base end is fixed to both sides of the outer peripheral surface of the inner shell 11, and a roller receiver that is inserted into the opening end of the short cylindrical body 6a so as to be freely advanced and retracted. Part 6b, a roller 6c pivotally supported so as to roll in the tunnel length direction at the tip of a roller receiving part 6b protruding outward from the short cylinder 6a, and press-fitted into the short cylinder 6a in a compressed state The coil receiving portion 6b is constantly pressed outward to make the roller 6c elastically contact the both sides of the inner peripheral surface of the tunnel lining body 30, and the roller when the excavator body 10 is recovered. Rolling that occurs in a direction orthogonal to the rotational direction of 6c is configured to be prevented by the frictional locking force between the roller 6c and the tunnel covering body 30. It is preferable that at least the outer periphery of the roller 6c is made of rubber having a large frictional locking force. Further, a jack may be employed instead of the coil spring 6d.

  The thrust transmission member 5 is formed in an L-shaped cross section including a vertical plate portion 5a and a horizontal plate portion 5b integrally provided at the lower end of the vertical plate portion 5a. The vertical connection piece 11a projecting inwardly on the rear end surface of the inner shell 11 of the excavator body 10 is surface-bonded to the rear surface and is detachably connected and fixed by a plurality of bolts 7a. The horizontal plate portion 5b is joined and received on the horizontal connecting pieces 26 fixed to both sides of the rear inner peripheral surface of the inner cylindrical portion 20b of the outer shell 20 of the tunnel excavator and is detachably connected by a bolt 7b. Is fixed. Note that the horizontal plate portion 5b may be directly connected and fixed to both sides of the rear inner peripheral surface of the inner cylinder portion 20b by bolts without providing the horizontal connection piece 26.

  The cutter head 13 rotatably supported at the central portion of the partition wall 12 in the excavator body 10 has an outer diameter substantially equal to the outer diameter of the outer shell 20 during tunnel excavation, and when the excavator body 10 is recovered, The outer diameter is configured to be reduced so as to pass through the circular hole 21 having a smaller diameter than the inner diameter of the tunnel covering body 30. Specifically, the cutter head 13 is provided with a plurality of hollow spokes 13a projecting radially from the front end of the rotating shaft 15 in the outer diameter direction so as to be able to pass through the circular holes 21 and radially extending. The outer spoke member 13b is accommodated in the hollow spoke 13a, and the outer spoke member 13b is caused to extend and retract from the opening end of the hollow spoke 13a by the expansion and contraction operation of the jack 17 mounted in the hollow spoke 13a. The length of the spoke composed of 13a and the outer spoke member 13b, that is, the outer diameter of the cutter head 13 is expanded or contracted from a length approximately equal to the outer diameter of the outer shell 20 to a length smaller than the circular hole 21. It is configured to make it. A plurality of excavation bits 13c are projected forward at predetermined intervals in the length direction on the front surface of these hollow spokes 13a with the outer spoke members 13b.

  Note that the cutter head 13 whose outer diameter can be expanded and contracted is not limited to such a spoke-type cutter head, and the outer periphery of the face plate-shaped cutter plate formed so that the outer diameter can pass through the circular hole 21. A cutter plate in which an outer peripheral cutter plate that can be assembled in an annular shape is detachably connected to the end surface may be used.

  Further, on the rear surface of the outer peripheral portion of each of the hollow spokes 13a in the cutter head 13, an arm member 18 protrudes rearward, and the rear ends of these arm members 18 are integrated with an annular frame member 19. The annular frame member 19 is rotatably supported on the inner peripheral surface of the front end portion of the inner shell 11, and the internal gear 19a is fixed to the rear end surface of the annular frame member 19, while the partition wall 14 is configured such that the small gear 9 fixed to the rotating shaft of the drive motor 8 is engaged with the internal gear 19a and the cutter head 13 is rotated by the drive motor 8. ing.

  Further, a space portion between the rear surface of the cutter head 13 and the front surface of the partition wall 14 is formed in a sand chamber 27 for taking in and temporarily retaining the earth and sand excavated by the cutter head 13 and from the lower part of the partition wall 14. The front end opening of the screw conveyor 24 as earth and sand discharge means is exposed in the earth and sand chamber 27, and the excavated earth and sand is discharged from the earth and sand chamber 27 by the screw conveyor 24 to the rear.

  The tunnel excavator configured as described above is installed in a start side shaft (not shown) and excavates the tunnel in a predetermined direction from the start shaft. Tunnel excavation involves expanding the cutter head 13 so that its outer diameter is substantially equal to the outer diameter of the outer shell 20, and a fixed-length tubular body consisting of a fume tube at the rear end of the outer shell 20 of the tunnel excavator. P is connected, the cutter head 13 is rotated, and the rear end face of the pipe P is pushed forward by propulsion means (not shown) such as a propulsion jack disposed in the rear end portion of the start shaft.

  Then, when the tunnel excavator excavates for a certain length in 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 by the propulsion means. Each time a tunnel of a certain length is excavated, the pipe body P is sequentially pushed on the start shaft side while being added, and the tunnel lining body 30 is formed.

  The propulsive force by the propulsion means is transmitted to the outer shell 20 through a tunnel lining body 30 composed of pipes connected in series, and further, the excavator body from the outer shell 20 through the propulsive force transmitting member 5 10, while the cutter head 13 is pushed against the face, the reaction force is transferred from the excavator body 10 supporting the cutter head 13 through the propulsion force transmission member 5 and the outer shell 20 to cover the tunnel. It is received by the front end face of the work body 30.

  Next, after excavating a tunnel of a predetermined length with a tunnel excavator and constructing the tunnel lining body 30 with the above-mentioned tubular body P row on the excavation wall surface, the excavator main body 10 of this shield excavator is removed to the start shaft side, A method of collecting will be described. First, the screw conveyor 24 is dismantled and collected through the tunnel lining body 30 to the start shaft side, and then the thrust transmission member 5 is removed and the inner shell 11 of the excavator body 10 is connected to the outer shell 20 of the tunnel excavator. 1, and the excavator body 10 can be moved rearward, and the rear end lower peripheral surface of the inner shell 11 of the excavator body 10 is opposed to the front collection wheels 16, 16 in FIG. As indicated by the lines, the rear collection wheels 16a, 16a are mounted. Further, the outer spoke member 13b of the cutter head 13 is accommodated in the hollow spoke 13a so that the outer diameter of the cutter head 13 is made smaller than the circular hole 21 of the support wall 22.

  On the other hand, the recovery device A of the excavator body 10 is carried in from the start shaft side. At this time, the airbag 2A of the levitation means 2 attached to the lower surface of the receiving device 1 of the collection device A is contracted, and the wheel 3 is rolled on the inner bottom surface of the tunnel covering 30 while the wheel 3 is rolled. It travels in the tunnel lining body 30 to the rear of the tunnel excavator and carries it in. The carrying-in operation of the collection device A may be pulled forward by connecting a rope or the like to the pulling hole 1e of the protruding piece 1E protruding from the front surface of the front support frame 1A of the cradle 1. The rear support frame 1B of the cradle 1 may be pushed in by an operator or the like. In this way, the recovery device A is carried into the front end portion of the tunnel lining body 30 and waits in the vicinity of the rear of the excavator body 10.

  At this time, an airtight sheet 4 made of a laid iron plate or a synthetic resin sheet is laid on the inner bottom surface of the tunnel lining body 30, and the recovery device A is kept on standby on the sheet 4. Note that the sheet 4 may be laid in advance over the entire length of the tunnel lining body 30, and the excavator body 10 is placed on the cradle 1 of the collection device A and collected backward. In doing so, it may be laid on the inner bottom surface of the tunnel covering body 30 so as to precede the backward movement of the cradle 1. In addition, when the tunnel covering body 30 has airtightness, it is not always necessary to lay this sheet 4.

  In this way, after the recovery device A is made to stand by behind the excavator body 10, the excavator body 10 is subsequently recovered. First, when the excavator body 10 is pulled rearward by an appropriate pulling means (not shown), the recovery wheels 16 and 16a attached to the lower peripheral surface of the inner shell 11 of the excavator body 10 become the outer shell 20. The inner shell 11 of the excavator main body 10 rolls back on the inner bottom surface of the outer shell 20 from the circular hole 21 provided in the support wall 22 on the outer shell 20 side and is supported by the partition wall 14 of the inner shell 11. The cutter head 13 is passed through the circular hole 21 as the inner shell 11 is retracted.

  Then, when the rear end of the inner shell 11 of the excavator main body 10 is retracted to the vicinity of the front end of the recovery device A, the traction of the excavator main body 10 is temporarily stopped, and the rear recovery wheel with respect to the lower peripheral surface of the inner shell 11 The excavator body 10 is slightly retracted while the lower peripheral surface of the inner shell 11 is slid on the bearing portion by uncoupling the bearing portion 16a, and the lower peripheral surface of the rear end portion of the inner shell 11 is 1 is transferred onto the front end. Next, the rear collection wheel 16a is removed from the lower peripheral surface side of the inner shell 11, and the inner shell 11 of the excavator body 10 is further moved toward the rear end side of the cradle 1 to collect the front collection wheel. When the wheel 16 reaches near the front end face of the cradle 1, the wheel 16 is temporarily stopped and the collecting wheel 16 is removed. Thereafter, the excavator body 10 is moved rearward so that the entire lower peripheral surface of the inner shell 11 is placed on the cradle 1 (see FIG. 1).

  In this state, a space 2C surrounded by the ring-shaped inner circumferential surface of the airbag 2A and the airbag 2A mounted on the bottom four sides of the cradle 1 from the compressed air supply source through the pipelines 2B and 2B ' When compressed air is supplied and press-fitted to the air bag 2A, the air bag 2A resists the load of the cradle 1 on which the excavator body 10 is placed while the lower peripheral surface is crimped and supported on the upper surface of the airtight sheet 4. While the cradle 1 is expanded and the cradle 1 is raised, the compressed air supplied into the space portion 2C is filled in the space portion 2C, and the space portion 2C becomes a pressure chamber, together with the airbag 2A. A part of the compressed air is jetted to the outside through the gap while forming a gap between the lower peripheral surface of the airbag 2A and the upper surface of the seat 4 by the air pressure. An air film is formed between the lower peripheral surface of the bag 2A and the seat 4.

  By the formation of the air film, the sliding contact of the airbag 2A with respect to the seat 4 is released, and when the cradle 1 on which the excavator body 10 is placed is pulled backward in this state, the cradle 1 is lifted. The airbag 2A slides on the air film and can smoothly move the cradle 1 backward with an extremely small traction force, and the work of collecting the excavator body 10 to the starting side can be efficiently performed.

  When the excavator body 10 is collected, the cradle 1 is pulled from the rear side by connecting a rope to the traction hole 1e of the projecting piece 1E projecting from the rear support frame 1B of the cradle 1. Is done. When the cradle 1 is pulled backward, rollers 6c and 6c rotatably supported on both side surfaces of the inner shell 11 of the excavator body 10 placed on the cradle 1 are shown in FIG. As shown, the tunnel lining body 30 moves in the tunnel length direction integrally with the excavator body 10 while rotating in contact with both side portions of the inner peripheral surface of the tunnel lining body 30. At this time, even if the cradle 1 vibrates left and right, the roller 6c is elastically pressed against the inner peripheral surface of the tunnel covering body 30 by the elastic force of the coil spring 6d. Furthermore, even if the excavator body 10 on the cradle 1 tries to roll, the rolling direction is perpendicular to the rotation direction of the roller 6c. The outer peripheral surface of the roller 6c in pressure contact with the inner peripheral surface of the tunnel lining 30 can be reliably prevented from rolling.

  In the above-described embodiment, the tunnel lining body 30 is formed by propelling the pipe P from the start shaft side while sequentially adding the pipes P according to the tunnel excavating machine. Using a tunnel excavator equipped with an assembly erector and a plurality of propulsion jacks, each time a certain length of tunnel is excavated, a tunnel lining body 30 is formed by assembling segments on the excavation wall surface with the above erector. Also good. In addition, a sealed bag is used as the air bag 2A which is the levitation means 2, and compressed air is supplied to the space 2C surrounded by the inside and the inner peripheral wall surface of the bag. A large number of air holes are provided on the inner peripheral wall facing the space to supply compressed air only into the air bag to inflate the air bag and press the compressed air into the space 2C from the air holes. In addition, a part of the air bag may be configured to flow out of the space portion while maintaining the pressure in the space portion in the airbag at an integral pressure.

The simplified vertical side view which shows the state at the time of the collection | recovery start of an excavator main body. The simplified front view of the receiving stand which mounted the excavator main body. The longitudinal section front view of a recovery device. The side view. The plan view. A longitudinal side view of a tunnel excavator. The longitudinal front view of a rolling prevention means.

A collection device 1 cradle 2 levitation means
2A Airbag 3 Wheel 4 Seat 6 Rolling prevention means
6c roller
6d coil spring
10 Excavator body
11 Inner shell
13 Cutter head
20 outer shell
30 Tunnel lining body

Claims (2)

A tunnel excavator is started from the starting side, and a tunnel lining body is constructed on the excavation wall surface while excavating a tunnel into the ground by the tunnel excavator. Is a device for recovering the excavator body provided with a cutter plate and a driving means for the cutter plate to the start side, and is curved in a circular arc shape in the circumferential direction along the inner bottom surface of the tunnel covering body and excavating the upper surface It comprises a cradle formed on the mounting surface of the machine main body, and a levitation means attached to the lower surface of the cradle, and the levitation means is elastically inflated attached to the lower surface of the cradle, A retractable ring-shaped bag, and a conduit for supplying pressure fluid from a pressure fluid supply source to the inside of the bag and the space surrounded by the bag, and a cradle between levitation means adjacent to both sides Levitated on the bottom four sides of Tunnel, characterized in that upon the stage of the bag is contracted and the cradle to roll over and in contact with the inner bottom surface of the tunnel lining member mounted rotatably a wheel to move to the tunnel longitudinal direction An excavator body recovery device for excavators. Rolling prevention means comprising rollers that roll in the tunnel length direction while being pressed against the tunnel lining by spring force is provided on both sides of the outer peripheral surface of the excavator body placed on the cradle. The excavator body recovery device for a tunnel excavator according to claim 1 .

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