JP4382020B2 - Guide device for recovery of tunnel excavator - Google Patents

Description

  The present invention relates to a tunnel excavator that can be reused after being formed through excavation of a tunnel in the ground and then removed and recovered through the conduit, and relates to a guide device for recovery of the tunnel excavator. It is.

  In tunnel construction work using the propulsion method or shield method to form a pipe in the ground, the tunnel excavator is dug from the starting vertical side toward the final vertical shaft, and the tunnel excavation is performed every time a certain length of tunnel is excavated. The tunnel excavator that has reached the reach shaft is usually recovered from the reach shaft to the ground, by continuously adding buried pipes of a certain length in succession to the machine. If there is no reaching shaft due to circumstances such as existing manholes on the arrival side, or if it cannot be recovered through the reaching shaft, dismantle the tunnel excavator after excavation There is a problem that it must be removed and collected through the tunnel to the start shaft, and the removal and collection work requires considerable effort and labor.

  Therefore, as described in Patent Document 1, in a tunnel excavator that forms a pipeline in the tunnel while excavating the tunnel in the ground, the outer diameter of the pipeline is substantially the same. A cylindrical outer shell body, and an excavator body that is detachably disposed in the outer shell body. The excavator body is detachably locked to the inner surface of the outer shell body. It is excavated by a cutter body, a cutter head that is rotatably supported by a partition wall provided integrally with the front part of the inner shell body, and whose outer diameter can be reduced, a driving means for the cutter head, and the cutter head. A shield excavator equipped with a means for discharging excavated sediment was developed.

Then, when the tunnel is excavated to a predetermined length by the shield excavator, the excavated earth and sand discharging means is collected and removed through the pipeline, and the cutter head is reduced to a diameter equal to or smaller than the inner shell, and the outer shell After unlocking the inner shell body, the outer shell body is buried in the excavation wall surface and left behind, while the excavator body is recovered and removed through the pipe and made usable again.
JP 2001-317285 A

  However, the shield excavator is provided with a plurality of straight groove portions at predetermined intervals in the circumferential direction on the inner peripheral surface of the outer shell body, and the straight groove portions protrude from the outer peripheral surface of the inner shell body of the excavator body. Since the plurality of ridges are inserted and locked, and the excavator body is connected to the outer shell body so that it can be pulled out, when the excavator body is recovered and used again, the excavator The inner shell of the main body must be inserted and locked into a new outer shell having the same diameter as that of the outer shell. Therefore, the shape and diameter of the outer shell are limited. Further, the difference between the inner diameter of the outer shell body and the inner diameter of the pipe is large, and a step is formed between the lower peripheral portion of the rear end of the inner shell supported by the outer shell body and the lower peripheral portion of the front end of the pipe. In this case, when the inner shell body of the excavator body is pulled out and collected from the outer shell body, it is difficult to collect the excavator body while stably supporting the excavator body by moving it concentrically on the pipeline.

  Such problems become larger as the length and diameter of the excavator body are shortened. Therefore, it is not possible to reduce the weight of the excavator body and ease of handling such as transportation. It is also difficult to expand the applicable range of the outer shell diameter according to the power tunnel diameter.

  The present invention has been made in view of such problems, and the object of the present invention is when the outer diameter of the inner shell body of the excavator body inserted and supported in the outer shell body is made small. The excavator body can be smoothly moved from the outer shell side to the pipeline side, regardless of the level difference between the rear end lower circumference of the inner shell and the front end lower circumference of the pipeline. It is an object of the present invention to provide a guide device for collecting a tunnel excavator that can be used.

  In order to achieve the above object, a tunnel excavator recovery guide device according to the present invention includes a tunnel excavator for excavating a tunnel in the ground with a predetermined length of pipe in the tunnel. And a guide device for recovering the excavator body in the tunnel excavator through the pipe, the tunnel excavator having an outer shell disposed on the front side of the pipe, and an inner shell An excavator comprising a bulkhead integrally provided in a shell and a cutter head for excavating the front ground of the outer shell, the outer diameter of which can be reduced, and a cutter head driving means and earth and sand discharging means. The main shell is formed with an inner diameter of the front shell of the outer shell smaller than the inner diameter of the pipe, and the inner shell of the excavator main body is connected to the inner periphery of the front barrel so that it can be pulled out rearward. And supporting the outer shell A spacer member whose upper end surface reaches the height of the inner peripheral surface of the front barrel is installed on the inner peripheral surface of the lower shell, and the lower peripheral portion of the outer peripheral surface of the inner shell of the excavator body is placed on the pipe side. In addition, a guide roller is mounted on the excavator body with a space that can pass through both sides of the spacer member, and the guide roller rolls on the inner bottom surface of the pipe line. However, the excavator body is collected.

  In the recovery guide device for a tunnel excavator configured as described above, the invention according to claim 2 is configured such that the spacer member is installed on the inner peripheral surface of the lower peripheral portion of the rear shell of the outer shell body and guides the upper surfaces of both side portions. The invention according to claim 3 is characterized in that the upper end support surface of the spacer member is moved up and down by a jack, characterized in that it is disposed on the center portion in the width direction of the base formed on the rolling guide surface of the roller. It is characterized by being freely configured.

  According to the first aspect of the present invention, the inner diameter of the front shell of the outer shell connected to the front end of the pipe is formed smaller than the inner diameter of the pipe, and the excavator main body is formed on the inner peripheral surface of the front trunk. A spacer member that connects and supports the inner shell body so that it can be pulled out rearward, and a spacer member whose upper end surface reaches the height of the inner circumferential surface of the front trunk on the inner circumferential surface of the lower circumference of the rear trunk of the outer shell body. Since the outer peripheral surface lower peripheral portion of the inner shell body of the excavator body is slidable on the spacer member on the spacer member, the rear end lower peripheral portion of the inner shell body and the pipe Despite the formation of a step which is lowered toward the pipeline side between the front end and the lower periphery, when recovering the excavator body, the excavator body does not deviate downward. The lower peripheral part of the outer peripheral surface of the inner shell body is received on the spacer member installed on the inner peripheral surface of the lower peripheral part of the rear shell of the outer shell body, and the spacer member is not slid. It can be recovered et smoothly and accurately tube roadside.

  Further, a guide roller is attached to the excavator body with a space that can pass through both sides of the spacer member, and the excavator body is recovered while rolling the guide roller on the inner bottom surface of the pipeline. Therefore, the guide roller mounted on the excavator main body can be moved to the pipeline side along both sides of the spacer member without being obstructed by the spacer member, and the pipe can be moved from the front end of the pipeline. The excavator main body is efficiently recovered without damaging the inner peripheral surface of the pipe line while continuously transferring the excavator main body by these guide rollers and stably supporting the excavator main body by the guide rollers. Can be removed.

  Thus, the excavator body can be easily recovered even if there is a step that is lowered toward the pipe side between the lower peripheral part of the rear end of the inner shell and the lower peripheral part of the front end of the pipe. As a result, the diameter and length of the inner shell of the excavator body can be shortened, and thus the weight of the excavator body can be reduced and handling and handling of the excavator body can be facilitated. The inner and outer diameters of the outer shell body can be set widely with respect to the outer diameter of the outer shell, so that a relatively wide range can be constructed from a small diameter tunnel to a large diameter tunnel.

  According to the invention of claim 2, the spacer member is installed on the lower peripheral portion of the inner peripheral surface of the rear shell of the outer shell body, and the upper surfaces of both side portions are formed on the rolling guide surface of the guide roller. Since it is arranged on the center part in the width direction of the base, the lower outer peripheral part of the inner shell of the excavator main body slides on the spacer member while retreating toward the pipe side. The excavator body can be smoothly recovered by rolling the guide roller on both sides of the base and continuously moving it on the pipeline while supporting the excavator body.

  Furthermore, as described in claim 3, the outer shell body drawn out from the outer shell body onto the spacer member when the excavator main body is recovered by configuring the spacer member to be movable up and down by a jack. Therefore, the guide roller can be easily attached to the excavator body, and after the guide roller is attached, the guide roller is lowered to lower the excavator body via the guide roller. Can be supported and can be smoothly recovered as described above.

  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. 2 is a simplified longitudinal side view of a tunnel excavator that has an outer diameter substantially equal to the outer diameter of the pipe P to be formed over the entire length and an inner diameter smaller than the inner diameter of the pipe P. A constant length outer shell 1 having a front shell 1a, an excavator body A disposed in the front shell 1a of the outer shell 1, and discharging means for discharging earth and sand excavated by the excavator body A B.

  The excavator main body A is formed so as to have a diameter smaller than the inner diameter of the pipe P, and the outer peripheral surface thereof is slidably contacted with the inner peripheral surface of the front shell 1a of the outer shell 1 so that it can be pulled out rearward. A short cylindrical inner shell body 2 fitted and supported, an isolation 3 having an outer peripheral surface fixed to the inner peripheral surface of the central portion in the length direction of the inner shell body 2, and a rotating center portion of the partition wall 3 And a cutter head 4 that rotatably supports a shaft 24. The cutter head 4 has an outer diameter substantially equal to the outer diameter of the outer shell 1 during tunnel excavation, and when the excavator body A is recovered. A pair of left and right front guide rollers 6a, 6a is formed such that its outer diameter can be reduced to be smaller than the inner diameter of the pipe P, and at a predetermined interval in the circumferential direction on the outer periphery of the reduced cutter head. (Shown in FIGS. 5 and 6) is configured to be mountable.

  Specifically, as shown in FIGS. 1 and 2, the cutter head 4 has the front end of the rotating shaft 24 protruding forward from the front end of the inner shell 2 and the rotating shaft 24 from the front end of the rotating shaft 24. A plurality of spoke bodies 4a1 (4 in the figure) whose length is shorter than the radius of the inner shell body 2 are radially projected in a direction orthogonal to the outer diameter direction (outer diameter direction). A cutter head whose excavation diameter is smaller than the inner diameter of the inner shell body 2 by projecting a plurality of cutter bits 4a2 forward at predetermined intervals in the longitudinal direction on both sides and the center of the front surface of the body 4a1 4a1 is formed, and the outer end surfaces of all the spoke bodies 4a1 of the small-diameter cutter head 4a are integrally fixed to the four inner peripheral surface portions of the circular ring body 4c, and the spoke bodies 4a1 adjacent to each other by the circular ring body 4c 4a1 are integrally connected to the outer end surfaces. When the excavator main body A is collected, the front guide rollers 6a and 6a are mounted on the circular ring body 4c.

  Furthermore, the outer diameter of each of the spoke bodies 4a1 is extended by adding a short outer peripheral side spoke body 4b1 having a plurality of cutter bits 4b2 projecting from both sides and the center of the front surface. A large-diameter cutter head portion 4b reaching the outer diameter of the shell 1 is formed. These spoke bodies 4b1 are configured such that their inner end surfaces are detachably fixed to the outer peripheral surface of the circular ring body 4c by bolts and nuts.

  In this cutter head 4, a large diameter capable of excavating the entire front ground of the outer shell body 1 by adding the outer spoke body 4 b 1 to the spoke body 4 a 1 constituting the small-diameter cutter head 4 a. By removing the outer spoke body 4b1, the small-diameter cutter head 4a that can be recovered to the start shaft side through the pipe P is integrated with the excavator body A. The spoke body 4a1 The hollow spoke body may be configured so that the outer spoke body can be retracted and retracted, and can be protruded from the hollow spoke body with a jack provided in the hollow spoke body. In addition, when the outer peripheral portion of the face plate-shaped cutter plate is formed in a detachable portion without being formed in the spoke-type cutter head whose outer diameter can be reduced in this way, The plate may have an outer diameter substantially equal to the outer diameter of the outer shell body 1, and when removed, the plate may be configured to have a diameter that can be removed through the inside of the pipe P.

  Arm members 17 project from the rear outer peripheral portions of the spoke bodies 4a1 forming the small-diameter cutter head portions 4a of the cutter head 4 toward the rear, and the rear ends of these arm members 17 are formed into an annular frame member. The annular frame body 18 is integrally connected by 18 and is rotatably supported on the inner peripheral surface of a cylindrical support frame 19 projecting forward from the front outer peripheral portion of the partition wall 3. The internal gear 20 is fixed to the rear end surface of the annular frame 18, and the small gear 22 fixed to the rotating shaft of the drive motor 21 by attaching the drive motor 21 to the outer peripheral portion of the rear surface of the partition wall 3. The cutter head 4 is configured to be engaged with the internal gear 20 and rotated by the drive motor 21.

  The outer shell 1 is composed of a front cylinder 1a and a rear cylinder 1b each having a constant length and an outer diameter substantially equal to the outer diameter of the pipe P. An inner cylinder portion 1a1 having an inner diameter smaller than the inner diameter of the pipe P is disposed inside, and the front and rear ends of the inner cylinder portion 1a1 are connected to the front and rear end portions of the front barrel 1a by ring-shaped connecting plates 1c and 1d. It is formed in a double tube structure that is integrally fixed to the inner peripheral surface. On the other hand, the rear cylinder 1b is formed to have substantially the same length as the front cylinder 1a, and is integrally fixed to the rear surface of the rear connection plate 1d on the inner peripheral surface of the front end portion, or is detachably joined and connected. An annular frame 7 is fixed, and a thrust transmission member 8 having an L-shaped cross section is detachably fixed at several locations on the inner peripheral surface of the annular frame 7 at a constant interval in the circumferential direction. The vertical plate portion 8a is brought into contact with the rear surface of the connecting ring portion 2a that is integrally fixed to the inner peripheral surface of the rear end portion of the inner shell 2 of the excavator body A, and is detachably connected by bolts, nuts, etc. The propulsive force from the pipe line P side is transmitted to the excavator body A side through the thrust transmission member 8.

  The inner surface of the rear cylinder 1b having a diameter larger than the inner diameter of the pipe P is formed behind the annular frame 7 without forming the rear cylinder 1b to which the thrust transmission member 8 is attached in a double pipe structure. Is formed, and direction control jacks 10 are disposed in the space 9 at predetermined intervals in the circumferential direction, for example, in four directions. The front ends of these direction control jacks 10 are pivotally connected by a shaft 12a to a bracket 11a projecting rearward from the rear surface of the base portion of the thrust transmission member 8, while the rear end is a tube. A shaft 12b is rotatably connected to a bracket 11b protruding from the front end of the short tube 13 fixed to the front end surface of the frontmost pipe body p forming the path P. Therefore, the rear end of the outer shell 1 is connected to and supported by the front end of the pipe P through these direction control jacks 10. Further, a support ring portion 13a having a fixed length is projected from the outer peripheral portion of the short tube 13 toward the front, and the outer tube portion 1a of the outer shell 1 is interposed on the support ring portion 13a via a sealing material 16. The inner peripheral surface of the rear end portion is fitted in a refractive manner.

  Further, when the excavator body A is collected, the annular frame 7 and the thrust transmission member 8 are removed, and then the thrust transmission member 8 is removed using the space portion 9a (shown in FIG. 3) formed in the removal trace. A pair of left and right rear guide rollers 6b and 6b are mounted on the rear end ring portion 2a of the inner shell 2 that has been fixed in the circumferential direction at the same interval as the front guide rollers 6a and 6a. 9, a spacer member 5 whose upper end reaches the height of the inner peripheral surface of the inner cylindrical portion 1a1 of the front barrel 1a in the outer shell 1 is installed on the inner peripheral surface of the lower peripheral portion of the rear barrel 1b. The lower peripheral part of the outer peripheral surface of the inner shell body 2 of the excavator body A is received on the upper end surface of the spacer member 5, and the pipe is moved while sliding the lower peripheral part of the inner shell body 2 on the spacer member 5. The excavator body A is moved while being moved to the side of the road P and passing the front and rear guide rollers 6a and 6b on both sides of the spacer member 5. And so as to constitute a collecting device for yield.

  As will be described later, the spacer member 5 may be directly installed in the space 9 on the inner peripheral surface of the lower peripheral portion of the rear barrel 1b. In this embodiment, as shown in FIGS. Further, the outer shell 1 is disposed on the central portion in the width direction of the substrate 25 having a certain thickness, which is installed on the inner peripheral surface of the lower peripheral portion of the rear barrel 1b. The length of the substrate 25 is substantially equal to the length of the space 9, that is, the length between the rear end surface of the annular frame 7 and the short tube 13 fixed to the front end of the tube body p at the distal end in the pipe P. The width is a flat rectangular frame plate having a width dimension that allows the front and rear guide rollers 6a and 6b to roll on both side upper surfaces, and its lower surface is curved so as to be in contact with the inner peripheral surface of the rear barrel 1b. In addition, the upper surface is curved in a concave arc shape with the same degree of curvature as the inner peripheral surface so as to be flush with the inner peripheral surface of the pipe P.

  The spacer member 5 has a constant thickness equal to the height difference between the upper surface of the substrate 25, that is, the inner peripheral surface of the pipe P and the inner peripheral surface (upper surface) of the inner cylindrical portion 1a1 of the front cylinder 1a. Although it may be formed from a plate member, the upper surface of the inner shell 2 of the excavator main body A that receives the lower peripheral portion is configured to be movable up and down by a jack 5a.

  Further, a space between the rear surface of the cutter head 4 and the front surface of the partition wall 3 is formed in a sand and sand chamber 14 in which the earth and sand excavated by the cutter head 4 is taken and temporarily retained, and at the lower part of the partition wall 3 An earth and sand intake 15 facing the lower end of the earth and sand chamber 14 is provided, and the earth and sand intake 15 is connected to the front end opening of the earth and sand discharging means B formed of a screw conveyor in a penetrating state. The excavated sediment is discharged backward from 14 through this sediment discharge means B. Further, a back material injection pipe 23 opened to the excavation ground side is disposed at the front end portion of the outer shell body 1, and this back material injection pipe 23 is backed through the supply hose 24 from the excavator body A. It is comprised so that material may be supplied.

  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. A pipe body p made of is connected via a direction control jack 10. In this state, the drive motor 21 is driven to rotate the cutter head 4, and the rear end surface of the pipe P is pushed forward by propulsion means comprising a plurality of propulsion jacks arranged in the start shaft, and the tunnel is dug. .

  Then, when the tunnel excavator is propelled 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 planned line while following the pipe p to the top pipe p. Hereinafter, every time a tunnel of a certain length is excavated by the tunnel excavator, the pipe 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 tube body p to the outer shell body 1 through the direction control jack 10, and further, the thrust transmission member 8 on the annular frame 7 fixed to the inner peripheral surface of the outer shell body 1 is provided. Is transmitted to the connecting ring portion 2a of the inner shell 2 on the excavator main body A side connected to the thrust transmission member 8, and the excavator main body A excavates while pressing the cutter head 4 against the face ground. The earth and sand excavated by the cutter head 4 is taken into the earth and sand chamber 14 and discharged to the start shaft side by the earth and sand discharging means B. When the direction of the tunnel excavator is corrected or the curved tunnel portion is excavated while the tunnel T is being excavated, the direction control jack 10 is operated to integrate the outer shell body 1 with the top pipe body p. The excavator body A is refracted in a predetermined direction.

  Next, after excavating a tunnel of a predetermined length by this tunnel excavator to form a conduit P communicating with the reaching vertical shaft C, a method for removing and recovering the excavator main body A of this tunnel excavator to the start vertical shaft side will be described. To do. When the tunnel excavator reaches the reaching shaft C, first, a succeeding carriage such as a drive unit carriage or a back-filling carriage arranged behind the tunnel excavator is placed on a rail laid on the inner bottom portion of the pipe P (not shown). )) And move to the starting shaft side. Next, the earth and sand discharging means B comprising a screw conveyor is removed from the partition wall 3 and is collected and removed to the start shaft side through the pipe P (see FIG. 3). The collection work of the earth and sand discharging means B can be performed on a carriage that runs on the rail for moving the subsequent carriage arranged in advance on the inner bottom portion of the pipe P. Moreover, after removing this rail, you may mount on the roller trolley | bogie which runs on the inner bottom face of the pipe line P. By doing so, the movement space can be widened and the transportability is improved.

  Further, the cutter head 4 is reduced so that its outer diameter is smaller than the inner diameter of the pipe P. At this time, when the outer diameter of the cutter head 4 is formed so as to be expandable / contractible by a jack, it may be reduced by the jack. However, the spoke body 4a1 constituting the small-diameter cutter head 4a is connected to the outer spoke member. In the case of the cutter head 4 formed by adding 4b1, the outer diameter spoke body 4b1 is reduced in diameter by removing the outer circumference spoke body 4b1, and the outer peripheral side spoke body 4b1 is connected through a port (not shown) provided in the partition wall 3 Carry it into P and collect it on the start shaft side, or collect it from the reaching shaft side to the ground side.

  Further, since the outer shell body 1 has entered the reaching shaft C, the upper peripheral portion of the front shell 1a of the outer shell body 1 is separated from the rear shell 1b and moved from the reaching shaft C to the ground side. Collect and remove. In addition, when the excavator main body A is recovered to the start vertical shaft side after excavating the tunnel to a predetermined length when the reaching vertical shaft C does not exist, the tubular body constituting the entire outer shell 1 is the pipe P It is left as a tunnel lining body together with p. In this case, the outer shell 1 does not need to be divided into the front cylinder 1a and the rear cylinder 1b.

  Further, the direction control jack 10 disposed in the space 9 on the rear shell 1b of the outer shell 1 is removed and removed, and the excavator main body A is detached from the outer shell 1. In this operation, first, the thrust transmission member 8 connected to the rear end connecting ring portion 2a in the inner shell 2 of the excavator body A is removed. In this operation, the thrust transmission member 8 is disconnected from the connecting ring portion 2a, and the annular frame 7 to which the thrust transmission member 8 is attached is cut off and removed by fusing or the like. Since the annular frame 7 and the thrust transmission member 8 are removed, a space portion 9a communicating with the front end side of the space portion 9 is formed on the rear side of the rear connecting plate 1d of the front shell 1a of the outer shell 1. Installation of the rear guide roller 6b is performed on the rear end face of the rear end connecting ring portion 2a of the excavator body A using the space 9a, and the substrate 25 is laid and fixed in the lower peripheral portion of the space 9; A spacer member 5 is installed on the central portion of the substrate 25.

  Further, since the front and rear guide rollers 6a and 6b are mounted on the upper peripheral side of the excavator main body A so that the excavator main body A can be recovered in a more stable state, Also, the substrate 25 'is laid and fixed. It is not necessary to install the spacer member 5 on the substrate 25 '.

  The rear guide rollers 6b and 6b are attached to the rear end of the connecting ring portion 2a of the excavator main body A so that the rear guide rollers 6b and 6b are wider than the spacer member 5 in the circumferential direction and on both sides of the substrate 25. This is performed by fixing the bearing portion 26 with a bolt or the like in a state where there is a width interval capable of rolling on the portion. Similarly, the pair of upper left and right guide rollers 6b and 6b are mounted with a width interval that allows rolling on both side portions of the substrate 25 '.

  Thus, after attaching the rear guide rollers 6b, 6b to the rear end portion of the inner shell 2 of the excavator body A, when a tow rope (not shown) is connected to the excavator body A and pulled backward, these The rear guide rollers 6b and 6b move on both sides of the front end of the substrate 25 and pass on both sides of the spacer member 5 while rolling on the upper surfaces of both sides of the substrate 25 (see FIG. 4). At this time, the outer peripheral surface of the lower peripheral portion of the inner shell 2 of the excavator main body A slides on the spacer member 5 while being supported by the spacer member 5, but the rear guide rollers 6 b and 6 b are connected to the pipe P. Until the pipe body p at the tip is reached, the front end of the inner shell 2 of the excavator body A is received on the front shell 1a of the outer shell 1 and the heavy cutter head 4 is present. The excavator body A is moved backward while the excavator body A is stably supported by the front barrel 1a and the rear end of the base 25 receiving the rear guide rollers 6b and 6b. When the front end of the inner shell 2 of the excavator body A is detached from the rear end of the front shell 1a of the outer shell 1, the rear guide rollers 6b and 6b reaching the front end of the pipe P and the spacer member 5 The excavator body A is supported in a stable state.

  When the cutter head 4 (reduced-diameter small-diameter cutter head portion 4a) reaches the space 9a after the thrust transmission member 8 is removed as shown in FIG. At that position, the rear guide rollers 6b and 6b are arranged in the circumferential direction on the outer peripheral surfaces of the upper and lower peripheral parts of the circular ring body 4c of the cutter head part 4a using the space 8a. A pair of front guide rollers 6a and 6a are mounted at the same interval. When the front guide rollers 6a, 6a are mounted, the jack 5a of the spacer member 5 supporting the lower peripheral portion of the front end of the inner shell 2 of the excavator main body A is extended to extend the front end of the excavator main body A. Is slightly lifted to widen the work space so that the front guide rollers 6a, 6a can be easily mounted.

  After mounting the front guide rollers 6a, 6a, the excavator body A is slightly retracted so that these front guide rollers 6a, 6a are positioned on both sides of the front end of the base 25, and then the spacer member 5 The front guide rollers 6a and 6a are placed on both sides of the front end of the base 25 by contracting the jack 5a, and the front guide rollers 6a and 6a and the rear guide rollers 6b and 6b In the state where A is supported, the excavator main body A is pulled rearward so that the front and rear guide rollers 6a and 6b roll on the pipeline P as shown in FIG. A is retracted and recovered and removed through the start shaft. The excavator main body A is used again after being removed from the front and rear guide rollers 6a and 6b and then incorporated into the outer shell 1 during the next tunnel construction.

  8 and 9 show another embodiment of the present invention. In the above embodiment, the space 9 formed on the inner peripheral surface of the rear barrel 1b of the outer shell 1 is shown in FIG. Although the substrate 25 that supports the front and rear guide rollers 6a and 6b so as to roll freely is laid and fixed, in this embodiment, the substrate 25 is not provided and only the spacer member 5 ′ is provided. That is, the spacer member 5 ′ has a width narrower than the interval between the left and right guide rollers and a length substantially equal to the length of the space 9, and the height is When the lower surface is fixed on the inner peripheral surface of the rear barrel 1b, the upper surface is formed so as to reach the inner peripheral surface of the inner cylindrical portion 1a1 of the outer shell body 1. The spacer member 5 'is also configured such that its upper surface can be moved up and down by a jack 5a. Since other structures are the same as those in the above embodiment, the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  Since it comprised in this way, at the time of collection | recovery of the excavator main body A, the rear-end both sides of the connection ring part 2a of the excavator main body A are utilized like the said embodiment using the back space part 9 'of the said front trunk | body 1a. When the excavator body A is pulled rearward after the left and right rear guide rollers 6b, 6b are mounted on the lower peripheral portion of the outer peripheral surface of the rear end portion of the inner shell 2 of the excavator body A, the spacer member 5 ' And move backward while sliding on the spacer member 5 '. At this time, the rear guide rollers 6b and 6b move rearward along both sides of the spacer member 5 ′.

  When the cutter head 4 (reduced diameter small-diameter cutter head portion 4a) reaches the space 9a after the thrust transmission member 8 is removed by the rear end of the excavator main body A, the excavator main body A is temporarily stopped at that position. In the same manner, the space 9a is used at that position on the outer circumferential surface of the upper and lower circumferential parts of the circular ring body 4c of the cutter head 4a in the circumferential direction at the same interval as the rear guide rollers 6b and 6b. A pair of front guide rollers 6a and 6a are attached to each other. When the front guide rollers 6a and 6a are mounted, the jack 5a of the spacer member 5 'is extended to slightly lift the entire excavator body A, and the work space is widened to mount the front guide rollers 6a and 6a. Make it easy to do.

  After mounting the front guide rollers 6a, 6a, the jack 5a of the spacer member 5 'is contracted to make the upper surface of the spacer member 5' the same height as the inner peripheral surface of the lower peripheral portion of the pipe P. By pulling A backward, the excavator body A is moved backward toward the start shaft while rolling the front and rear guide rollers 6a and 6b on the pipe P, and is collected and removed through the start shaft. . At this time, when the front guide rollers 6a and 6a are mounted on the lower peripheral portion of the cutter head portion 4a having a reduced diameter, the front end of the inner shell 2 of the excavator body A is detached from the rear end of the spacer member 5 ′. Even if the front guide roller 6a, 6a does not reach the front end of the pipe P even if it reaches the front end of the pipe P, the excavator body A tilts with the rear guide rollers 6b, 6b as fulcrums. In order to prevent this, an auxiliary spacer member 5 '' is provided from the rear end of the spacer member 5 'to the lower peripheral portion of the front end of the pipe P, and the front guide roller 6a , 6a after reaching the lower peripheral portion of the front end of the pipe P, the inner shell body 2 is configured to be detached rearward from the auxiliary spacer member 5 ''.

  In any of the above-described embodiments, the front guide rollers 6a, 6a are mounted on the cutter head portion 4a which is the reduced size of the cutter head 4, but the front guide rollers 6a, 6a are provided on both sides of the front end of the inner shell body 2 of the excavator body A. You may comprise so that it may mount | wear. In this case, it is not necessary to provide the auxiliary spacer member 5 '' when the excavator body A is collected.

A longitudinal side view of a tunnel excavator. The front view of a cutter head. The longitudinal section side view of the tunnel excavator after reaching the reach shaft. The longitudinal section side view which shows the state in the middle of the retreat start of an excavator main body. The longitudinal section side view of the state where the excavator body was stopped at a position retracted by a predetermined length. The front view which shows the mounting state of a rear part guide roller. The vertical side view of the state which collect | recovers the excavator main body. The vertical side view which shows another embodiment of the collection | recovery apparatus of this invention. The simplified front view.

Explanation of symbols

P Pipe A A Excavator body 1 Outer shell 2 Inner shell 4 Cutter head 5 Spacer member
6a, 6b Front and rear guide rollers 8 Thrust transmission member 9, 9a Space
10-way control jack
25 base

Claims (3)

  A guide device for recovering an excavator body in the tunnel excavator after forming a predetermined length of the pipe in the tunnel while excavating the tunnel in the ground by a tunnel excavator, The tunnel excavator is capable of rotating the outer shell body located on the front side of the pipeline and the cutter head whose outer diameter can be reduced to excavate the front ground of the outer shell body into the bulkhead integrated in the inner shell body. And an excavator body having a cutter head driving means and a sediment discharge means. The inner diameter of the front shell of the outer shell is smaller than the inner diameter of the pipe. The inner shell of the excavator body is connected to and supported by the peripheral surface so that the inner shell can be pulled out rearward, and the upper end surface is the inner peripheral surface of the front shell on the lower peripheral inner peripheral surface of the rear shell of the outer shell. Install a spacer member that reaches the height of The lower peripheral part of the outer peripheral surface of the inner shell of the excavator body can be slid toward the pipe side, and a guide roller is attached to the excavator body with an interval through which both sides of the spacer member can pass. A tunnel excavator recovery guide device characterized in that the excavator body is recovered while rolling the guide roller on the inner bottom surface of the conduit.   The spacer member is installed on the center part in the width direction of the base, which is installed on the inner peripheral surface of the lower peripheral part of the rear shell of the outer shell body, and the upper surfaces of both side parts are formed on the rolling guide surface of the guide roller. The recovery guide device for a tunnel excavator according to claim 1, wherein the guide device is a recovery device.   The recovery guide device for a tunnel excavator according to claim 2, wherein the upper end surface of the spacer member that supports the lower peripheral portion of the inner shell of the excavator body is configured to be movable up and down by a jack.

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