JP2006219979A - Tunnel excavator for forming piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel excavator for forming piping enabling generation of rolling of the excavator at the time of tunnel excavation to be securely prevented and enabling withdrawal and removal of a body of the excavator to be smoothly carried out after the tunnel excavation. <P>SOLUTION: The tunnel excavator comprises an outer cylinder having a rear end integrated with a front end of pipe body to be embedded, and the main body of excavator arranged in the outer cylinder. The main body of the excavator has an inner cylinder and a cutter head rotatably held by a partition wall and having an outer diameter to be expansible and contractible. Protrusion pieces are formed in either an outer peripheral surface of the inner cylinder or an inner peripheral surface of the outer cylinder in the peripheral direction at a small interval. A rolling prevention means is formed of the protrusion pieces and intervention pieces inserted between the protrusion pieces to be projected. The diameter of the cutter head is reduced, and thereafter the body of the excavator is withdrawn and removed through the outer cylinder. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tunnel excavating machine for forming a pipeline, in which a pipeline is formed by burying a pipe while excavating a tunnel in the ground, and then removed and recovered through the pipeline. .

  In shield construction to form a pipeline in the ground, the tunnel excavator is excavated from the start shaft side toward the arrival shaft, and every time a fixed length tunnel is excavated, the tunnel excavator is followed by a fixed length. The tunnel excavator that has reached the reaching shaft is usually recovered from the inside of the reaching shaft, but the reaching shaft is already installed in the manhole, etc. If there is no narrow shaft, or if there is no final shaft, or if there are no vertical shafts, such as when two tunnel excavators are docked in the ground, the tunnel excavator from the arrival side Can not be taken out.

  Therefore, after excavation, the tunnel excavator must be disassembled and removed to the start shaft side through the pipe and recovered, and there is a problem that the removal and recovery work requires considerable labor and labor. In particular, in the case of a tunnel excavator that forms a small-diameter pipe having a diameter of 3000 mm or less, removal work in a narrow work space is extremely difficult.

For this reason, the tunnel excavator is inserted and fixed in the leading laying pipe, and the facility on the start shaft side while rotating the cutter head of the tunnel excavating machine protruding forward from the opening end of the leading facility pipe By pushing the pipe forward, the tunnel excavator is advanced to excavate the tunnel, and each time a certain length of tunnel is excavated, a facility pipe is formed in order, and then after excavation is completed, After reducing the cutter head so that it has a smaller diameter than the inner diameter of the facility pipe and unlocking the shield excavator to the leading facility pipe, the shield excavator is retracted to the starting shaft through the pipeline without dismantling, Recovery from the start shaft to the ground side is performed (for example, refer to Patent Document 1).
Japanese Patent Publication No. 7-68871

  However, according to the pipe line forming method as described above, as a means for fixing the excavator body with respect to the inside of the facility pipe, the pressing bolt projecting out of the skin plate by passing the pressing bolt through the skin plate between the inner and outer surfaces. The retaining plate attached to the tip is crimped to the inner surface of the facility pipe, and the propulsion reaction force acting on the excavator body is supported by this fixing means. There is a risk of acting in a direction perpendicular to the vertical direction to obtain a sufficient support force, and the excavator body may move backward or the facility pipe may be damaged.

  Furthermore, the rotational reaction force of the cutter head during tunnel excavation is supported by the pressure contact force (frictional force) between the retaining plate attached to the tip of the pressing bolt and the inner surface of the facility pipe. The pressure contact force cannot reliably support the rotational reaction force of the cutter head, and there is a problem that the excavator body rolls due to slip.

  Although it is disclosed that the joint portion between the first facility pipe and the next facility tube can be refracted so that the direction can be corrected, it is not a middle-folding mechanism, so it cannot be refracted greatly, and is sufficient. There is a problem that correct direction correction is difficult.

  Furthermore, the seal mechanism between the tunnel excavator and the facility pipe is configured such that a seal ring is inserted into the groove of the metal holder that is externally fitted to the skin plate, and this metal holder is placed at the tip of the first facility pipe. Since the seal ring is in close contact with the front auxiliary plate projecting from the outer peripheral surface of the facility pipe, the metal ring is used when the tunnel excavator is retracted through the pipeline. Although it is necessary to remove the holder, it is extremely difficult to remove the metal holder outside the skin plate from the inside of the skin plate, and there is a problem that the removal work requires a considerable effort.

  The present invention has been made in view of the above problems, and its purpose is to enable tunnel excavation while preventing the occurrence of rolling, and to strengthen the driving reaction force during tunnel excavation. A tunnel excavator for forming a pipeline that can be received and can be rectified reliably, and that the tunnel excavator can be collected and removed through the pipeline smoothly and efficiently after tunnel excavation. To provide.

  In order to achieve the above object, a tunnel excavator for forming a pipeline according to the present invention includes a pipe by sequentially burying pipes in the tunnel while excavating the tunnel in the ground. In a tunnel excavator that forms a path, an outer cylinder that is provided on the front end side of the leading pipe body and has substantially the same outer diameter as the pipe body, and an excavator body disposed in the outer cylinder The outer cylinder has a ring body whose inner diameter is smaller than the inner diameter of the pipe body on the inner circumferential surface of the front end portion, while the excavator body has a front end portion of the outer circumferential surface of the inner circumference of the ring body. An inner cylinder that is in close contact with the surface via a sealing material, a partition wall provided at the front of the inner cylinder, and a ground supported by the partition wall so as to be freely rotatable and excavating the ground in front from the open end of the outer cylinder. The cutter head is formed so that the outer diameter can be reduced to be smaller than the inner diameter of the sealing material. Furthermore, projecting pieces project from the outer peripheral surface of the inner cylinder of the excavator body and the inner peripheral surface of the outer cylinder portion with a small gap in the circumferential direction, and these are provided on the other side. An intervention piece inserted between the projecting pieces is provided so as to constitute rolling prevention means for the tunnel excavator by these projecting pieces and the intervention pieces.

  In the tunnel excavator for pipe formation configured as described above, the invention according to claim 2 divides the outer cylinder into a front outer cylinder part and a rear outer cylinder part, and a front end of the rear outer cylinder part. The front outer cylinder portion is refractably connected to the side via a direction correcting jack, and the rear end portion outer peripheral surface of the inner cylinder of the excavator body and the inner peripheral surface of the rear outer cylinder portion of the outer cylinder, One of the above is characterized in that a protruding piece is provided with a small interval in the circumferential direction, and an intervention piece inserted between these protruding pieces is provided on the other side.

  Furthermore, the invention which concerns on Claim 3 has connected the inner cylinder back from the partition of the said excavator main body via the propulsion reaction force transmission member which can be cut | disconnected to the internal peripheral surface of the front side outer cylinder part in an outer cylinder. It is characterized by.

  According to the first aspect of the present invention, in the tunnel excavator that forms a pipeline by sequentially burying the pipe body in the tunnel while excavating the tunnel in the ground, the front end side of the leading pipe body And an excavator main body disposed in the outer cylinder, and the outer cylinder has an inner diameter on the inner peripheral surface of the front end portion of the tubular body. While the ring body having a smaller diameter than the inner diameter protrudes, the excavator body has an inner cylinder in which the front end portion of the outer peripheral surface is in close contact with the inner peripheral surface of the ring body via a sealing material, and the inner cylinder A partition wall provided at the front of the outer cylinder, and supported by the partition wall so as to be rotatable, excavating the ground in front from the opening end of the outer cylinder, and having an outer diameter that can be reduced to a smaller diameter than the inner diameter of the sealing material. And an outer peripheral surface of the inner cylinder of the excavator body. Protruding pieces project from one of the inner peripheral surfaces of the outer tube portion with a small gap in the circumferential direction, and intervention pieces inserted between these projecting pieces project to the other. Since the rolling prevention means of the tunnel excavator is configured by the piece and the intervention piece, the inner cylinder of the excavator body tries to roll against the outer cylinder by the rotational reaction force of the cutter head during tunnel excavation. In addition, the turning force that the tunnel excavator tries to roll can be firmly received by the pipe body through the rolling prevention means including the protruding piece and the intervention piece, and the occurrence of rolling can be reliably prevented. .

  Also, when the excavator body is recovered after forming a predetermined length of pipe, the sealing material in close contact with the front end of the outer peripheral surface of the inner cylinder of the excavator main body is the front end inner peripheral surface of the front outer peripheral surface of the outer cylinder Is provided on the inner peripheral surface of the ring body having a diameter smaller than the inner diameter of the pipe body, so that the inner cylinder of the excavator body can be smoothly detached rearward while being in sliding contact with the seal material. In addition, the excavator body can be efficiently recovered and removed through the pipe line with the cutter head having a smaller diameter than the inner diameter of the pipe body.

  According to the invention which concerns on Claim 2, the said outer cylinder is divided | segmented into the front side outer cylinder part and the rear side outer cylinder part, and has connected the rear end of the rear side outer cylinder part to the front end of the said top tubular body. In addition, since the front outer cylinder part is refractably connected to the front end side of the rear outer cylinder part via a direction correction jack, the rear outer side of the outer cylinder can be operated by operating the direction correction jack. The front outer cylinder part can be easily and greatly refracted in a predetermined direction according to the operation amount of the direction correction jack with respect to the cylinder part, and the direction of the tunnel excavator during excavation can be corrected and the curved tunnel by this tunnel excavator Construction can be performed accurately and efficiently.

  Furthermore, according to the invention which concerns on Claim 3, the inner cylinder back from the partition of the said excavator main body is connected via the propulsion reaction force transmission member which can be cut | disconnected to the internal peripheral surface of the front outer cylinder part in an outer cylinder. Therefore, when the pipe is formed, the rearward propulsive force can be reliably transmitted to the inner cylinder of the excavator body via the outer cylinder and the propulsion reaction force transmission member, and the partition wall provided at the front of the inner cylinder The tunnel can be smoothly excavated by the cutter head supported in a freely rotatable manner.

  In addition, the propulsion reaction force acting on the excavator body can be firmly supported from the outer tube to the tube side via the propulsion reaction force transmission member, and the propulsion reaction force transmission member is exposed in the tunnel excavator. Therefore, after the formation of the predetermined length of the conduit, the driving reaction force transmission member can be easily detached from the inner peripheral surface of the outer cylinder from the inside of the machine, and the outer diameter of the cutter head can be reduced. After the outer diameter is formed smaller than the inner diameter of the body, the entire excavator body can be efficiently recovered and removed with the outer pipe and the inner peripheral surface of the pipe body as a guide surface with the outer pipe remaining in the ground. it can.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. A tunnel excavator A includes an outer cylinder 1 made of a steel pipe whose outer diameter is equal to the outer diameter of a pipe body P to be embedded, and the inner diameter of the outer cylinder 1 The excavator body 10 is provided with an inner cylinder 11 whose outer diameter is smaller than the inner diameter of the pipe body P, and an outer peripheral end surface of the inner cylinder 11 provided at the front portion of the inner cylinder 11. A partition wall 12 that is integrally fixed to the inner peripheral surface of the inner cylinder 11 and a cutter head 13 that is rotatably supported by the partition wall 12 and excavates the ground facing the open end of the outer cylinder.

  The outer cylinder 1 is divided into a front outer cylinder part 1A having a length equal to or longer than the inner cylinder 11 of the excavator main body 10 and a short annular outer rear cylinder part 1B. The rear end of the rear outer cylinder portion 1B is integrally connected and fixed to the front end of the tubular body P, and the direction correcting jack 7 is attached to the front end side of the rear outer cylinder portion 1B. The front outer cylinder portion 1A is connected in a refractive manner.

  These front and rear outer cylindrical portions 1A and 1B are formed of inner and outer double cylindrical peripheral wall portions 1a1 and 1a2; 1b1 and 1b2 between front end portions and rear end portions, respectively, front and rear ring-shaped connecting end plates 1a3 and 1a4; 1b3 and 1b4 Is formed in a rectangular shape having a cross section that is substantially equal to the thickness of the tube P, and further extends inward from the inner peripheral end of the front ring-shaped connecting end plate 1a3 in the front outer cylinder portion 1A. A ring body 1c is integrally projected in the direction, and the front end outer peripheral surface of the inner cylinder 11 of the excavator body 10 is slidably contacted with the inner peripheral end surface of the ring body 1c via the sealing material 4 and the front side By projecting the front and rear end portions of the outer cylindrical peripheral wall portion 1a1 in the outer cylindrical portion 1A by a predetermined length from the front and rear ends of the inner cylindrical peripheral wall portion 1a2, the rear protruding piece portion 1a5 is projected to the rear outer cylindrical portion 1B. The outer cylindrical peripheral wall portion 1b1 is fitted to the front end portion of the outer peripheral surface of the outer cylindrical peripheral wall portion 1b1 through a sealing material 4a so as to be refractable.

  The rear outer cylinder portion 1B is in a state where the rear end face plate 1b4 and the protruding piece 1b5 projecting rearward from the rear end face plate 1b4 are brought into close contact with the front end face and the front end outer peripheral face of the tube P, respectively. The rear end face plate 1a4 of the front outer cylinder portion 1A is received on the front end face plate 1b3 without being fixed thereto.

  The excavator body 10 places the inner cylinder 11 in the front outer cylinder portion 1A of the outer cylinder 1 thus configured at a small interval from the inner peripheral surface of the inner cylindrical peripheral wall portion 1a2 of the front outer cylinder portion 1A. In this state and as described above, the front end of the inner cylinder 11 is disposed in such a manner that the outer peripheral surface of the front end of the inner cylinder 11 is in sliding contact with the inner peripheral end surface of the ring body 1c via the sealing material 4. The guide roller 2 is rotatably supported at a plurality of locations on at least the lower peripheral portion of the portion, and is supported on the inner peripheral surface of the outer cylinder 1, that is, on the front end portion of the inner peripheral surface of the inner cylindrical peripheral wall portion 1a2. .

  Further, the rear end portion of the inner cylinder 11 of the excavator body 10 can be separated from the inner peripheral surface of the rear end portion of the front outer cylindrical portion 1A, that is, the inner peripheral surface of the rear end portion of the inner cylindrical peripheral wall portion 1a2. The driving reaction force generated when the tunnel excavator A is dug is transferred from the inner cylinder 11 of the excavator body 10 to the driving reaction force transmission member 3 and the front and rear outer cylinder portions 1A and 1B. It is comprised so that it may be supported by the pipe body P via.

  The propulsion reaction force transmission member 3 is formed by connecting and fixing a vertical rectangular plate piece 3a and a horizontal rectangular plate piece 3b at right angles to each other by a reinforcing rib 3c. And an outer surface of the horizontal rectangular plate piece 3b form two connection surfaces orthogonal to each other. On the other hand, vertical connecting plates that are surface-bonded to the vertical rectangular plate pieces 3a of the propulsion reaction force transmission member 3 at a plurality of circumferential positions (four directions in the figure) at the rear end portion of the inner cylinder 11 of the excavator body 10. The piece 3d is integrally fixed together with the reinforcing member 3e, and the vertical rectangular plate piece 3a of the propulsion reaction force transmission member 3 is joined to each of the vertical connecting plate pieces 3d and connected and fixed by a plurality of bolts 3f. ing.

  Further, the horizontal rectangular plate piece 3b of the propulsion reaction force transmission member 3 is detachably fixed to the inner peripheral surface of the rear end of the outer cylinder 1, that is, the inner peripheral surface of the inner peripheral wall portion 1b of the outer cylinder 1. The horizontal connecting plate pieces 3g are surface-joined and connected and fixed together by a plurality of bolts 3f. In order to make it possible to separate the horizontal rectangular plate piece 3b of the propulsion reaction force transmission member 3 from the inner cylinder 11, the horizontal connecting plate piece 3g is fixed to the inner peripheral surface of the inner cylinder 11 by welding, A horizontal rectangular plate piece 3b may be fixed to the horizontal connecting plate piece 3g so as to be separable by bolts 3f, and the horizontal connecting plate piece 3g can be horizontally fixed without being fixed to the inner peripheral surface of the inner cylinder 11 by welding. The rectangular plate piece 3b and the bolt 3f may be detachably fixed to the inner surface of the inner cylinder 11.

  On the other hand, as shown in FIG. 3, there are small intervals in the circumferential direction at two locations on the inner peripheral surface of the rear outer cylindrical portion 1B, that is, the upper portion of the inner peripheral surface of the rear cylindrical peripheral wall portion 1b2. The projecting pieces 6a, 6a, which are horizontally long and long in the front-rear direction, project inward toward the outer peripheral surface of the rear end of the inner cylinder 11 of the excavator body 10, while the rear end of the inner cylinder 11 Two horizontally long intervention pieces 6b inserted between the protruding pieces 6a and 6a are provided at the upper two locations on the outer peripheral surface. These protruding pieces 6a and 6a and the intervention pieces 6b prevent rolling of the tunnel excavator. Means 6 are formed.

  That is, by receiving both side surfaces of the intervention piece 6b integral with the inner cylinder 11 on the opposite inner side surfaces of the projecting pieces 6a and 6a integral with the rear outer cylinder portion 1B integrally coupled with the pipe body P. The entire tunnel excavator composed of the outer cylinder 1 and the excavator main body 10 is configured to prevent rolling with respect to the pipe body P. The protruding pieces 6a and 6a may be provided on the inner cylinder 11 side, and the intervention piece 6b may be provided on the rear outer cylinder portion 1B side.

  Further, the four upper and lower left and right portions of the front outer cylinder portion 1A and the rear outer cylinder portion 1B in the outer cylinder 1 are connected by the direction correcting jack 7 as described above. Specifically, the upper, lower, left and right portions of the rear half of the inner cylindrical peripheral wall portion 1a2 of the front outer cylindrical portion 1A are excised, and the direction is corrected along the upper, lower, left and right of the inner peripheral surface of the outer cylindrical peripheral wall portion 1a1 at the cut portion. A jack 7 is provided, and a front end portion of the direction correcting jack 7 is rotatably connected to a bearing piece 8 projecting from an inner peripheral surface of the outer cylindrical peripheral wall portion 1a1 by a pin 5a, while a rear end portion. Is rotatably connected by a pin 5b to a bearing piece 9 fixed to the front end portion of the rear outer cylinder portion 1B.

  The cutter head 13 of the excavator main body 10 has a rotation center shaft 14 rotatably supported at the center of the partition wall 12 and is orthogonal to the rotation center shaft 14 from the front end of the rotation center shaft 14. As shown in FIG. 2 toward the direction (outer diameter direction), a plurality of pieces having a length smaller than the radius of the inner peripheral surface of the outer cylinder 1 or the tubular body P and substantially equal to the radius of the inner cylinder 11 Spoke portions 13a (six in the figure) project radially, and the outer end facing surfaces of adjacent spoke portions 13a are integrally connected by an arc-shaped connecting member 13b.

  Further, cutter bits 15a are projected forward from the spoke portions 13a at appropriate intervals in the lengthwise direction, and are disposed at intervals in the plurality of spoke portions 13a. As described above, the spoke portion 13a 'can be extended from a length shorter than the radius of the inner peripheral surface of the outer cylinder 1 or the tube P to a longer length reaching the outer peripheral surface of the outer cylinder 1, and this long shape. The outer diameter of the cutter head can be reduced from a diameter substantially equal to the outer diameter of the outer cylinder 1 to a smaller diameter than the inner diameter of the tubular body P.

  As the concrete structure of the expandable / reducible spoke portion 13a ′, as shown in FIG. 1, the spoke portion 13a ′ is formed in a cylindrical hollow spoke portion 13a ′ having an open front end surface. A spoke piece 13a '' having a plurality of cutter bits 15b projecting forward on both sides of the front face is accommodated in the spoke part 13a 'and mounted on the bottom of the hollow spoke part 13a'. By the operation of the jack 16, this spoke piece 13a '' is configured to protrude and retract from the open end of the hollow spoke portion 13a '. A center bit 15c is projected from the front surface of the rotation center shaft 14 of the cutter head 13.

  In addition, arm members 17 are protruded rearward at several locations on the outer periphery of the back surface of the cutter head 13, and the rear ends of these arm members 17 and 17 are integrally connected by an annular frame member 18. An annular frame member 18 is rotatably supported on the inner peripheral surface of the inner cylinder 11, and an internal gear 19 is fixed to the rear end surface of the annular frame member 18, while the excavator main body 10 has the above-mentioned structure. A drive motor 20 is mounted on the rear surface of the outer peripheral portion of the partition wall 12, and the small gear 21 fixed to the rotation shaft of the drive motor 20 is engaged with the internal gear 19, and the cutter head 13 is rotated by the drive motor 20. It is composed.

  Further, a space between the rear surface of the cutter head 13 and the front surface of the partition wall 12 is formed in a sand chamber 22 that takes in the sand excavated by the cutter head 12 and temporarily retains it. The excavated sediment is discharged backward through the soil means 23.

  As shown in FIG. 1, the earth discharging means 23 is a screw conveyor, and its front end opening penetrates the lower part of the partition wall 12 and faces the lower end part of the earth and sand chamber 22. It is arranged in a state inclined obliquely upward.

  Next, a method for forming a pipeline in the ground by the pipeline forming tunnel excavator A configured as described above will be described. First, the tunnel excavator A is installed in the start shaft B, and the cutter head 13 is in a state of expanding the diameter, and a fume pipe is formed at the rear end of the rear outer cylinder portion 1B in the tunnel excavator A. The front ends of the pipes P are connected together. In this state, the cutter head 12 is rotated and the rear end surface of the pipe P is pushed forward by the propulsion means C such as a propulsion jack disposed in the rear portion of the start shaft B to dig the tunnel.

  When the tunnel excavator A propels from the start shaft B into the ground for a certain length, 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 connected to the propulsion means C. The tunnel excavator A is further excavated along the tunnel planned line with the pipe P following the leading pipe P. Hereinafter, a tunnel of a certain length is excavated by the tunnel excavator A. Every time, the pipe P is pushed forward while being added on the start shaft B side to form a pipe line as shown in FIG. The earth and sand excavated by the cutter head 13 is discharged from the earth and sand chamber 22 through the earth discharging means 23 to the start shaft B side.

  The propulsive force by the propulsion means C comes into contact with the front end of the rear outer cylindrical portion 1B via the rear outer cylindrical portion 1B that is integrally fixed to the front end of the leading tubular body P from the rearmost tubular body P. Is transmitted to the received front outer cylinder portion 1A, and further transmitted from the front outer cylinder portion 1A to the excavator body 10 via the propulsion reaction force transmission member 3 to dig while pressing the cutter head 13 against the face. To do. A projecting piece 7a is projected on the inner peripheral surface of the central portion in the length direction of the cylinder portion of the direction correcting jack 7, and the projecting piece 7a is formed in the inner cylinder of the excavator body 10 as shown in FIG. 11 is connected to the projecting piece 11a projecting on the outer peripheral surface of the excavator 11 by bolts, the above-mentioned propulsive force is transmitted from the rear outer cylinder part 1B to the excavator body 10 via the direction correcting jack 7 and the projecting pieces 7a, 11a. Can be transmitted to the inner cylinder 11.

  On the other hand, the reaction force of the propulsive force is the propulsion reaction force transmitting member that integrally connects the inner cylinder 11 and the front outer cylinder portion 1A of the outer cylinder 1 from the excavator body 10 supporting the cutter head 13. 3 is supported by the front outer cylinder portion 1A, and is further supported by the tubular body P via the rear outer cylinder portion 1B receiving the rear end of the front outer cylinder portion 1A.

  At this time, the propulsion reaction force transmission member 3 is formed by connecting the vertical rectangular plate pieces 3a and the horizontal rectangular plate pieces 3b at right angles to each other and connecting and fixing them together by the reinforcing ribs 3c. The vertical connecting plate piece 3d fixed to the rear end portion of the inner cylinder 11 of the excavator body 10 is joined to the front surface of the vertical rectangular plate piece 3a in FIG. Since the piece 3b is surface joined to the horizontal connecting plate piece 3g that is detachably fixed to the rear end inner peripheral surface of the front outer cylinder portion 1A, and is integrally connected and fixed by a plurality of bolts 3e. The propulsion reaction force acting on the head 13 can be firmly received on the tube P side via the propulsion reaction force transmission member 3.

  Further, during tunnel excavation, the inner cylinder 11 of the excavator body 10 tries to roll due to the rotational reaction force of the cutter head 13, but the horizontally long rectangular shape projecting on the outer peripheral surface of the rear end portion of the inner cylinder 11 The intervening piece 6b is inserted between the projecting pieces 6a and 6a projecting in parallel on the inner peripheral surface of the rear outer cylinder portion 1B that is integrally fixed to the front end of the leading tubular body P. The intervention piece 6b is received by one of the opposing inner surfaces of the protruding pieces 6a and 6a, and can be reliably prevented from rolling with respect to the tube P, and the inner cylinder 11 tries to roll. The rotating power of the entire tunnel excavator A can be prevented without transmitting the rotational force to the front outer cylinder portion 1A.

  Furthermore, during tunnel excavation by the tunnel excavator A, when the planned tunnel for forming the pipe is curved, or when it is necessary to correct the excavation direction, the outer cylinder 1 of the tunnel excavator A Of the four direction correction jacks 7 connecting the front outer cylinder portion 1A and the rear outer cylinder portion 1B of the outer cylinder 1 fixed to the front end of the leading tube P, a predetermined direction correction jack 7 is provided. The tunnel excavator A is operated so that the entire direction of the tunnel excavator A is directed to the planned curve tunnel direction or the direction to be corrected with respect to the rear outer cylinder portion 1B.

  For example, when it is desired to change the direction of the tunnel excavator A to the right side, when the right direction correction jack 7 is inactivated or contracted and the left direction correction jack 7 is extended, the outer cylinder 1 of the tunnel excavator A is expanded. The rear end protruding portion 1a5 of the front outer cylinder portion 1A is refracted rightward through the sealing material 4a with respect to the front outer peripheral surface of the rear outer cylinder portion 1B. This refraction angle can be adjusted to be large or small depending on the amount of extension of the left direction correction jack 7, and the direction correction and curved tunnel construction during excavation can be easily and accurately performed.

  Next, after excavating a tunnel of a predetermined length by the shield excavator A to form a pipeline, the excavator body 10 can be removed and recovered by projecting from the open end of the hollow spoke portion 13a 'in the cutter head 13. As shown in FIG. 5, the spoke piece 13a '' whose diameter of the cutter head 13 is expanded is accommodated in the spoke portion 13a 'by contraction of the jack 16, and the outer diameter of the cutter head 13 is set to the outer cylinder 1 and the tube. The diameter is smaller than the inner diameter of the body P.

  Further, a horizontal connecting plate fixed to the inner peripheral surface of the rear end of the front outer cylinder portion 1A in the propulsion reaction force transmission member 3 that connects the rear end portion of the inner cylinder 11 and the front outer cylinder portion 1A of the outer cylinder 1. The piece 3g is separated from the front outer cylinder portion 1A and removed, and a part of the reinforcing rib 3c integrally connecting the vertical rectangular plate piece 3a and the horizontal rectangular plate piece 3b of the propulsion reaction force transmitting member 3 is formed. As shown in FIG. 6, the rear guide roller 2 ′ is rotatably supported on the reinforcing rib 3 c so as to be supported on the inner peripheral surface of the outer cylinder 1. At this time, the removal of the horizontal connecting plate piece 3g of the propulsion reaction force transmission member 3 and the installation work of the rear guide roller 2 'are performed because the propulsion reaction force transmission member 3 is disposed in the tunnel excavator A. It can be done easily. In addition, a guide roller may be provided in advance at the rear end portion of the outer peripheral surface of the inner cylinder 11, and in this case, it is not necessary to install the rear guide roller 2 ′, and the propulsion reaction force transmission member It is only necessary to perform the operation of separating 3 from the front outer cylinder portion 1A.

  Further, the protruding pieces 6a, 6a and the intervention pieces 6b constituting the rolling preventing means 6 are also removed by excision or the like, and the screw conveyor mounted on the partition wall 12 of the excavator body 10 as shown in FIG. The earth removing means 23 is removed and recovered and removed to the start shaft B side through the pipe. If the protruding pieces 6a, 6a fixed to the inner peripheral surface of the outer cylinder 1 in the rolling preventing means 6 do not hinder the cutter head 13 from moving backward, it is not always necessary to remove it.

  As described above, the diameter of the cutter head 13 is reduced, the connection and fixing of the inner cylinder 11 of the excavator body 10 to the front outer cylinder portion 1A of the outer cylinder 1 in the tunnel excavator A are released, and the soil removal means 23 is removed. After that, when the excavator body 10 is pulled from the rear side by a suitable pulling means (not shown), the outer peripheral surface of the front end of the inner cylinder 11 protrudes inwardly from the inner peripheral surface of the front end of the outer cylinder 1. While sliding against the sealing material 4 of the body 1c and retreating from the sealing material 4, the front and rear guide rollers 2 and 2 'are rolled on the inner peripheral surface of the tube P as shown in FIG. The excavator body 10 is collected on the start shaft B side and removed from the start shaft B to the ground. Thereafter, as shown in FIG. 9, the direction correcting jack 7 is removed, removed and collected. When the tunnel excavator A is collected, the ground in front of the cutter head may be solidified by chemical injection or the like.

  In the above embodiment, the rear end inner peripheral surface of the inner cylindrical peripheral wall portion 1a2 of the front outer cylinder portion 1A of the outer cylinder 1 is connected to the rear end portion of the inner cylinder 11 in the excavator body 10 by the propulsion reaction force transmission member 3. 10 and 11, as shown in FIGS. 10 and 11, a notch 24 having a size that allows the propulsion reaction force transmission member 3 to be attached to the front end of the inner cylinder 11 on the back side of the partition wall 12. Are provided at predetermined intervals in the circumferential direction, and a vertical connecting plate piece 3d 'is fixed to the rear surface of the partition wall in the notch 24, and a vertical rectangular plate piece 3a of the propulsion reaction force transmitting member 3 is attached to the vertical connecting plate piece 3d'. The horizontal rectangular plate piece 3b of the propulsion reaction force transmission member 3 is fixed to the inner peripheral surface of the inner cylindrical peripheral wall portion 1a2 of the front outer cylindrical portion 1A of the outer cylinder 1 in a detachable manner. The horizontal connecting plate piece 3g may be surface-joined and integrally connected and fixed by a plurality of bolts 3f. 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.

  Further, in any of the above embodiments, a fume pipe is adopted as the pipe body P forming the pipe line, but it may be a steel pipe. Further, as the outer cylinder 1 in the tunnel excavator A, It is desirable that it is made of steel, but even if it is made of concrete, it cannot be applied.

  Further, the spoke portion 13a ′ of the cutter head 13 is formed by hollowly forming the spoke portion 13a ′, and a plurality of cutter bits 15b projecting forward from both sides of the front face in the hollow spoke portion 13a ′. The spoke piece 13a '' is retracted from the opening end of the hollow spoke portion 13a 'by the operation of the jack 16 mounted in the bottom portion of the hollow spoke portion 13a'. The outer diameter of the head 13 is configured to expand and contract, but a spoke piece of a certain length is detachably connected to the outer end of the spoke portion 13a ', and the cutter head 13 is connected in a state where the spoke piece is connected. The outer diameter of the outer cylinder 1 may be substantially equal to the outer diameter of the outer cylinder 1, and the cutter head 13 may be configured such that the outer diameter of the cutter head 13 can be removed through the pipe line when the spoke piece is removed.

  Furthermore, the pipe line is formed by sequentially propelling and burying the pipe body P by the propulsion method, but every time a tunnel of a fixed length is excavated by the tunnel excavator A, it is located behind the rear outer cylinder portion 1B. It may also be applied to a shield method for assembling a tunnel by assembling a segment and pressing and extending a plurality of propulsion jacks mounted in the rear end portion of the rear outer cylinder portion 1B against the front end surface of this segment. .

Simplified longitudinal side view of the whole tunnel excavator connected to the tip of the tube, Front view of cutter head, Simplified longitudinal rear view of propulsion reaction force transmission member and rolling prevention means Simplified longitudinal side view of the state of forming a pipeline, Simplified cross-sectional plan view with the cutter head reduced in diameter after forming the conduit, A simplified longitudinal side view of the excavator body in a state where it can be recovered, A simplified longitudinal side view of the state of removing the soil removal means, A simplified longitudinal side view of the excavator body being collected, Simplified longitudinal side view of the state where the direction correcting jack is collected, A simplified longitudinal side view showing another embodiment of the present invention, The simplified vertical side view of the state which removed the propulsion reaction force transmission member.

Explanation of symbols

A Shield excavator B Starting shaft 1 Outer cylinder
1A Front outer cylinder
1B Rear outer cylinder 3 Propulsion reaction force transmission member
3a Vertical rectangular plate
3b Horizontal rectangular plate 6 Rolling prevention means 7 Direction correction jack
10 Excavator body
11 Inner cylinder
12 Bulkhead
13 Cutter head

Claims (3)

  In a tunnel excavator that forms a conduit by sequentially burying pipes in the tunnel while excavating the tunnel in the ground, it is provided on the front end side of the leading pipe and is substantially the same as the pipe The outer cylinder is composed of an outer cylinder having an outer diameter and an excavator body disposed in the outer cylinder, and the outer cylinder projects a ring body whose inner diameter is smaller than the inner diameter of the pipe body on the inner peripheral surface of the front end. On the other hand, the excavator body has an inner cylinder in which the front end portion of the outer peripheral surface is in intimate contact with the inner peripheral surface of the ring body via a sealing material, and a partition wall provided at the front portion of the inner cylinder, A cutter head that is rotatably supported by the partition wall and excavates the ground in front from the opening end of the outer cylinder and has an outer diameter that can be reduced to a smaller diameter than the inner diameter of the sealing material; Further, either the outer peripheral surface of the inner cylinder of the excavator body or the inner peripheral surface of the outer cylinder portion Projecting pieces projecting at small intervals in the circumferential direction, and intervention pieces inserted between these projecting pieces projecting on the other side and rolling of the tunnel excavator by these projecting pieces and intervention pieces A tunnel excavating machine for forming a pipeline characterized by comprising a prevention means.   The outer cylinder is divided into a front outer cylinder part and a rear outer cylinder part, and the front outer cylinder part is refractably connected to the front end side of the rear outer cylinder part via a direction correcting jack. A projecting piece projecting from the outer peripheral surface of the rear end of the inner cylinder of the excavator body and the inner peripheral surface of the rear outer cylinder of the outer cylinder with a small gap in the circumferential direction; The tunnel excavating machine for forming a pipeline according to claim 1, wherein an intervention piece interposed between the protruding pieces is provided on the pipe.   The inner cylinder behind the partition wall of the excavator body is connected to the inner peripheral surface of the front outer cylinder portion of the outer cylinder via a detachable propulsion reaction force transmission member. A tunnel excavator for forming pipes as described in 1.

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