JP5599345B2 - Tunnel excavator for renewal of existing pipes - Google Patents

Description

  The present invention relates to a tunnel excavation apparatus for updating an existing pipeline for updating an existing pipeline such as an aging sewer pipe to a new pipeline.

  As an apparatus for updating an existing pipeline such as a sewer pipe that has deteriorated due to long-term use to a new pipeline, for example, as described in Patent Document 1, the diameter is larger than that of the existing pipeline. A tunnel excavator having an annular cutter head provided with a bit for excavating the rear outer peripheral ground of an existing pipeline at the front end opening of the cylindrical skin plate, and disposed in front of the tunnel excavator A cylindrical hood body covering the existing pipe line and having a rear end sealed by an end face plate, and connecting the end face plate to a partition wall behind the cutter in the tunnel excavator. As a connecting structure between the above end face plate and the bulkhead of the tunnel excavator, a jack is attached to the center of the bulkhead in the front-rear direction, and the center of the end face plate is swingably connected to the tip of this jack rod in the vertical and horizontal directions. The structure has been adopted.

  Furthermore, a bit penetrating into the ground around the existing pipe line is projected at the opening front end of the cylindrical hood body, and a pressure water injection nozzle is disposed forward on the outer peripheral surface of the cylindrical hood body. In addition, a cutting machine for the existing pipe line can be carried into the rear end portion of the existing pipe line covered with the cylindrical hood body, and excavated by the cutter head inside the tunnel excavator. A screw conveyor is provided to discharge the earth and sand to the rear.

  In order to update an existing pipeline to a new pipeline with the apparatus configured as described above, a cutting machine is carried into the existing pipeline, and the rear end portion of the existing pipeline is made into a plurality of block-shaped pieces by this cutting machine. While cutting and carrying out this block-shaped piece through the existing pipe line, on the rear side of the tunnel excavator, the fume pipe is pushed from the start side of the tunnel excavator into the excavation site of the tunnel excavator, or a fixed length For each of the excavations, a new pipeline with a built outer diameter larger than the outer diameter of the existing pipeline is formed by assembling segments on the excavation trace of the tunnel excavator.

Japanese Patent No. 4094182

  However, according to the tunnel excavating apparatus for renewing the existing pipe as described above, the existing pipe can be renewed while preventing the groundwater and earth and sand from entering the existing pipe by the cylindrical hood body. However, a tunnel for constructing a new pipeline is formed by excavating the outer peripheral ground behind the existing pipeline with a tunnel excavator that follows the cylindrical hood body while leading the cylindrical hood body. As a result, not only will the propulsion resistance of the cylindrical hood increase, but if there is gravel in the ground, it may be difficult to dig while crushing the gravel. In addition, since there is no earth and sand discharge passage excavated by the cylindrical hood body, it is sent to the rear tunnel excavator side along the outer peripheral surface of the cylindrical hood body. There is a possibility to lower the excavation efficiency can not be eliminated. In addition, a hardened layer of the backing agent injected during the formation of this pipe line is attached to the outer peripheral surface of the existing pipe line, but the bit protruding from the front end of the cylindrical hood has a hardened layer. It is difficult to remove, and if this hardened layer remains during excavation of the outer peripheral ground of the cylindrical hood, there is a possibility that the dismantling operation may not be smoothly performed by the hardened layer when the existing pipe line is disassembled.

  Further, the tunnel excavator following the cylindrical hood body has an outer diameter of the cylindrical skin plate and the cutter head formed larger than the outer diameter of the cylindrical hood body. Since it is configured to excavate the outer peripheral ground behind, the tunnel diameter excavated by this cutter head is larger than the outer diameter of the cylindrical hood body, and the new pipeline constructed in this tunnel is Inevitably, the diameter of the pipe is larger than that of the existing pipe, and the construction cost becomes high and the construction period becomes longer than necessary.

  The present invention has been made in view of such problems, and the purpose of the present invention is to efficiently and reliably perform the work of renewing an existing pipeline such as an old sewage pipe to a new pipeline. An object of the present invention is to provide a tunnel excavating apparatus for renewal of an existing pipe line that enables construction of a new pipe line having the same diameter as the road.

In order to achieve the above object, the tunnel excavating apparatus for renewing an existing pipeline according to the present invention advances as the existing pipeline is disassembled and removed from the rear end side and removed on the rear side as described in claim 1. A tunnel excavating apparatus for renewing an existing pipe that forms a new pipe, and the existing pipe is disposed on the front side of a shield body composed of a front trunk and a rear trunk, which are connected to each other by a plurality of bent middle jacks. An inner cylinder that covers the outer peripheral surface of the rear end of the road and an outer cylinder that covers the inner cylinder and has a front end protruding forward from the front end of the inner cylinder are provided at the front end of the front cylinder. The outer peripheral portion of the back plate of the outer cylinder is rotatably supported on the outer peripheral portion of the front wall of the partition wall, and a fixing member is protruded through the central portion of the rear plate of the outer cylinder in the front central portion of the partition wall, The back plate of the inner cylinder is supported at the front end of the fixing member so that it can be bent vertically and horizontally. While projecting the斫Ri blade in sliding contact with the outer peripheral surface front ends of the existing pipe line of the inner cylinder takes斫Ri a cured layer such as Urakomi agents that are fixed to the outer peripheral surface, existing at the front end of the outer cylinder A plurality of cutter bits for excavating the outer peripheral ground of the pipe line are mounted, and the space between the front surface of the back plate of the outer tube and the rear surface of the back surface of the inner tube around the fixing member is the outer periphery of the inner tube. This is formed in a mud chamber connected to the rear end of the excavation sediment discharge passage formed between the surface and the inner peripheral surface of the outer cylinder. And a rotational drive mechanism for the outer cylinder is disposed in the partition wall of the seal body.

  In the tunnel excavating apparatus for renewal of an existing pipe constructed as described above, the invention according to claim 2 is provided adjacent to the front end of the inner cylinder by projecting the above-mentioned beaten blade at regular intervals in the circumferential direction. The jet water jet nozzle faces forward between the scooping blades, and further, a seal material slidably in contact with the outer peripheral surface of the existing pipe line is attached to the inner peripheral surface of the front end portion of the inner cylinder. To do.

Furthermore, in the invention according to claim 3 , a cylindrical center shaft for inserting and disposing a bypass pipe from the existing pipe line through the shield main body into the new pipe line is provided in the center of the partition wall of the shield main body. It is characterized by projecting.

  According to the first aspect of the present invention, there is provided a tunnel excavation device for updating an existing pipeline that advances as the existing pipeline is disassembled from the rear end side and removed, and forms a new pipeline on the rear side. The inner cylinder that covers the outer peripheral surface of the rear end of the existing pipe line on the front side of the shield body, and the outer cylinder that covers the inner cylinder and the front end projects forward from the front end of the inner cylinder, At the front end of the inner cylinder, a drilling blade is slidably brought into contact with the outer peripheral surface of the existing pipe line and scrapes off the hardened layer such as a backing agent fixed to the outer peripheral surface. Since a plurality of cutter bits for excavating the outer peripheral ground of the road are mounted, the outer peripheral ground at the rear end of the existing pipe line is advanced while the outer cylinder is rotated, and the shield body is advanced to advance the inner pipe. Can be drilled efficiently with a cutter bit attached to the front end of the outer cylinder In both cases, since a discharge passage for excavated earth and sand is provided between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder, the earth and sand excavated by the cutter bit is taken into the discharge passage as the outer cylinder advances. , It can be smoothly and reliably discharged to the shield body side through the discharge passage.

  In addition, along with the excavation of the outer peripheral ground of the existing pipe line by the cutter bit protruding from the front end of the outer cylinder, the existing pipe is formed by the cutting blade protruding from the front end of the inner cylinder arranged following the cutter bit. It is possible to continuously scrape off a hardened layer such as a backing agent adhering to the outer peripheral surface of the road. Therefore, if the existing pipe line is composed of a fume pipe, this fume by the cutting machine is formed in the inner cylinder. Cutting and dismantling work from the rear end side of the pipe can be performed reliably while preventing the cutting blade from being damaged. If the existing pipe line consists of a lining segment, The disassembly and removal of the segment from the end side can be performed smoothly, and the shield main body can be advanced in accordance with the dismantling and removal of these existing conduits, and a new conduit can be formed on the rear side.

  Furthermore, since the outer peripheral ground at the rear end of the existing pipeline is excavated by a rotating outer cutter bit prior to the shield body, the diameter of the existing pipeline is concentric with the existing pipeline along the outer circumference of the existing pipeline. The tunnel can be excavated accurately, so that a new pipeline can be accurately built on the tunnel excavation site, and the outer diameter of the shield body following the outer cylinder can be set to the outside of the outer cylinder. The shield body can be formed in the same diameter as the diameter or smaller than the outer diameter of the outer cylinder, and the shield body can be smoothly advanced into the tunnel excavated by the excavation of the outer cylinder. Construction of a new pipeline having the same outer diameter as the outer diameter of the pipeline is possible, the pipeline can be renewed efficiently, and the construction period can be shortened.

According to the present invention , the shield body includes a front cylinder and a rear cylinder that are refractably connected to each other by a plurality of middle folding jacks, and the outer periphery of the partition wall provided at the front end of the front cylinder Since the outer peripheral part of the rear end of the cylinder is rotatably supported, the rear end of the outer cylinder is integrated with the front cylinder corresponding to the inclined part and the curved part of the existing pipe line while rotating the outer cylinder. The tunnel for renewal of the new pipeline can be excavated smoothly and reliably on the outer peripheral surface of the existing pipeline by automatically deflecting in the vertical and horizontal directions via the middle folding jack.

  Furthermore, a short cylinder-shaped fixing member protrudes from the central part of the front surface of the partition wall through the central part of the rear end of the outer cylinder, and the outer peripheral part of the rear end of the inner cylinder extends vertically and horizontally in the front end of the fixing member. Since it is refractably supported, the inner cylinder is automatically deflected in the direction of the tube axis of the existing pipe along the outer peripheral surface of the existing pipe along the inclined part or curved part of the existing pipe. It is possible to propel it integrally with the outer cylinder.

  Further, a space between the outer periphery of the front surface of the outer cylinder and the outer periphery of the rear surface of the inner cylinder around the fixing member is formed in a muddy water chamber communicating with the rear end of the excavation earth and sand discharge passage between the inner and outer cylinders. The pipe is connected to discharge the excavated sediment through this pipe, so the sediment excavated by the front end cutter bit of the outer cylinder is discharged from the shield body to the start shaft side through the new pipe. The digging with the shield body can be performed efficiently.

  According to the second aspect of the present invention, the cutting blades are projected at regular intervals in the circumferential direction at the front end of the inner cylinder, and the jet water injection nozzle is directed forward between the adjacent cutting blades. Therefore, jet water is sprayed from the spray nozzle toward the scraped scraped piece while scraping the hardened layer such as the backing agent layered on the outer peripheral surface of the existing pipe line with a scraping blade. It is possible to easily peel off the scraped piece from the outer peripheral surface of the existing pipe line by spraying. Furthermore, since the sealing material slidingly contacted with the outer peripheral surface of the existing pipe line is mounted on the inner peripheral surface of the front end portion of the inner cylinder, the above-mentioned sealing material prevents groundwater and earth and sand from entering the existing pipe line through the inner cylinder. In addition to being able to prevent, the hardened layer of the hardened layer peeled off from the outer peripheral surface of the existing pipe line by the above-mentioned cutting blade is sent out from the front end of the inner cylinder to the front side of the cutter bit by the jet water from the injection nozzle, and excavated earth and sand Moreover, it can take in in the earth-and-sand passage between the opposing surfaces of an inner cylinder and an outer cylinder, and can discharge | emit it in a shield main body.

According to the third aspect of the present invention, the cylindrical center shaft for inserting and arranging the bypass pipe into the new pipe line from the existing pipe line through the shield main body to the central part of the partition wall of the shield main body is directed forward. If the existing pipeline consists of sewage pipes, the old pipelines are dismantled and the new pipelines are dismantled while circulating the sewage through this bypass pipe without stopping the sewage flow. Compared with the ability to perform renewal work, and because the bypass pipe is arranged in the center shaft, dismantling of existing pipe lines can be easily performed around the bypass pipe without interfering with the work. A wide working space can be secured, and the above-mentioned dismantling work and the like in the existing pipeline can be performed smoothly.

The simplified longitudinal section side view of the tunnel excavator which is updating the existing pipeline to the new pipeline. The simple longitudinal front view in the AA of FIG. The simplified longitudinal cross-sectional view in the BB line of FIG. The simplified longitudinal cross-sectional front view in the CC line of FIG. The expansion vertical side view of the front-end part of an inner and outer cylinder. The simplified front view. The longitudinal side view which shows another Example of this invention.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a shield body having a certain length formed in a cylindrical shape, and a partition wall 2 is integrally provided at a front end opening. It consists of a short cylinder-shaped front cylinder 1a and a rear cylinder 1b with a front end joined to the rear end of the front cylinder 1a. The joint is bent so that the front cylinder 1a and the rear cylinder 1b can refract each other. The inner folding surface of the front and rear cylinders 1a and 1b is connected to each other by a plurality of middle folding jacks 22 arranged at predetermined intervals in the circumferential direction. Thus, the front cylinder 1a is configured to bend in the vertical and horizontal directions from the middle bent part 1c with respect to the front end part of the rear cylinder 1b.

  The partition wall 2 has its outer peripheral end surface fixed integrally to the inner peripheral surface of the opening end of the front body 1a of the shield body 1, and the central portion of the partition wall 2 is recessed rearward to move forward. It is formed in a front circular recess 2a having a certain depth and depth, and a rear end center portion of an outer cylinder 3 described later is rotatably supported in the recess 2a. 3 is configured to be driven to rotate around its center, and an existing pipe line P1 is formed in the front central portion of the rear wall portion 2b of the partition wall 2 forming the bottom wall portion of the recess 2a. A circular tube-shaped center shaft 5 having a fixed length inserted in the center of the rear end of the rear end is provided. The front end of the center shaft 5 opens forward and the rear end fixed to the rear wall 2b of the partition wall 2 passes through the rear wall 2b of the partition wall 2 and opens rearward. The bypass pipe P3 made of a flexible hose is inserted and piped through the center shaft 5 and into the existing pipe P1 and the new pipe P2 formed in the rear part of the shield body 1. doing.

  Further, a cylindrical outer cylinder 3 that rotates in a state of covering the outer peripheral surface of the rear end portion of the existing pipe line P1 is disposed on the front side of the shield body 1, and the outer cylinder 3 is disposed in the outer cylinder 3. The inner cylinder 6 having a shorter cylindrical shape is disposed in a state where the outer peripheral surface thereof is spaced from the inner peripheral surface of the outer cylinder 3 with a small gap, and the inner end surface is disposed at the front end of the outer cylinder 3 with the existing pipe line P1. A plurality of cutter bits 7 for excavating the front ground around the existing pipe line P1 while rotating around the existing pipe line P1 while being in sliding contact with or close to the outer peripheral surface of the pipe as shown in FIG. Protruding at every interval, the earth and sand intake port 8a is provided between the adjacent cutter bits 7 and 7 on the inner peripheral surface of the open end of the outer cylinder 3, and between the opposing surfaces of the outer cylinder 3 and the inner cylinder An earth-and-sand discharge passage 8 having an annular cross-section communicating with the earth-and-sand intake 8a is formed by the space. Further, the outer diameter of the shield body 1 is formed to be the same as or slightly smaller than the outer diameter of the outer cylinder 3, and the shield body 1 is added to the tunnel excavation site excavated by the outer cylinder 3 prior to the shield body 1. It is configured to promote.

  An outer peripheral end of an annular back plate 3a is integrally fixed to the rear end of the outer cylinder 3 so as to oppose the front surface of the outer peripheral portion of the partition wall 2 of the shield body 1, and the rear surface of the inner peripheral portion of the rear plate 3a. Further, an internal gear 4a rotatably supported on the inner peripheral wall surface of the recess 2a in the partition wall 2 of the shield body 1 is integrally provided, while a drive motor 4b is provided on the rear outer peripheral portion of the rear wall portion 2b of the partition wall 2. And the small gear 4c fixed to the rotating shaft through the seal wall of the rotating shaft of the drive motor 4b through the sealing material through the rear wall 2b is meshed with the internal gear 4a, and these driving motors 4b The rotational drive mechanism of the outer cylinder 3 is constituted by the internal gear 4a and the small gear 4c meshed with each other. In addition, the rotation center of the outer cylinder 3 is on the same axis as the shield body 1, and is configured to advance integrally with the shield body 1 while rotating.

  A sealing material 6a slidably in contact with the outer peripheral surface of the existing pipe line P1 is attached to the inner peripheral surface of the front end portion of the inner cylinder 6 to prevent intrusion of groundwater or the like into the inner cylinder 6 and In the vicinity of the rear end of the inner end of the cutter bit 7 attached to the front end of the cylinder 3, the front end of the inner cylinder 6 is slidably contacted with the outer peripheral surface of the existing pipe line P1, and is fixed to the outer peripheral surface of the existing pipe line P1. As shown in FIG. 6, a scissor blade 9, which has a sharpened tip that scrapes off a hardened layer (not shown) such as a backing agent, is formed at regular intervals in the circumferential direction. A pipe 10a having a plurality of injection nozzles 10 for injecting jet water toward the front with the tip injection port facing between adjacent blades 9 and 9, and having these injection nozzles 10 at the front end. Is fixed to the inner peripheral surface along the inner peripheral surface of the inner cylinder 6 and jet water supply means disposed in the shield body 1 (Not shown) is connected and communicated. The injection nozzle 10 has its tip facing the earth and sand intake port between the adjacent cutter bits 7 and 7 penetrating the sealing material 6a in a watertight manner.

  An outer peripheral end of an annular back plate 6b is fixed to the rear end of the inner cylinder 6 in the same manner as the outer cylinder 3, and the outer peripheral surface of the ring member 6c is integrated with the inner peripheral end surface of the back plate 6b. A curved inner circumference that is fixed to the inner circumferential surface of the ring member 6c and is curved in a concave arc shape centering on a fixing member 12 to be described later in the outer diameter direction from the front and rear end edges toward the center portion in the width direction. The curved inner circumferential surface 6d is formed on the surface 6d, and the curved inner circumferential surface 6d is curved in a convex arc shape formed on the outer circumferential surface of the small-diameter annular plate-shaped support member 11 whose outer diameter is equal to the inner diameter of the back plate 6b. The inner cylinder 6 is fitted to the outer peripheral surface 11a by sliding the inner peripheral surface 6d of the ring member 6c on the curved outer peripheral surface 11a. The direction can be changed in the vertical and horizontal directions with respect to the center.

  Further, the support member 11 is attached to the front end surface of the fixing member 12 made of a short cylinder projecting forward with the rear end surface fixed to the front central portion of the rear wall portion 2b of the partition wall 2 of the shield body 1. The outer peripheral rear surface is fixed so as to be concentrically supported by the fixing member 12, and the space between the opposing surfaces of the back plate 3 a of the outer cylinder 3 and the back plate 6 b of the inner cylinder 6 around the fixing member 12. A portion is formed in the muddy water chamber 13, and the muddy water chamber 13 communicates with the rear end of the earth and sand discharge passage 8 formed between the opposed surfaces of the inner peripheral surface of the outer cylinder 3 and the outer peripheral surface of the inner cylinder 6. ing. Further, the mud chamber 13 is connected to the front end openings of the feed and discharge mud pipes 14 and 15 that are piped through the shield body 1, and the excavated sediment in the mud chamber 13 is moved backward through the feed and discharge mud pipes 14 and 15. To be discharged. Reference numeral 16 denotes a plurality of scrapers projecting forward from the front outer peripheral portion of the back plate 3 a of the outer cylinder 3 toward the muddy water chamber 13. The rear end portion of the center shaft 5 is inserted into the center portion of the fixing member 12 made of the short cylinder and is fixed to the center of the rear wall portion of the partition wall 2.

  Further, as shown in FIG. 3, rollers 17 are rotatably mounted on the inner peripheral surface of the rear end portion of the inner cylinder 6 so that the outer peripheral surface of the swiveling ring 18 can be rotated in the circumferential direction. Support jacks 19 and 19 are attached to both sides of the front surface of the swiveling ring 18 in parallel to the radial direction of the existing pipe line P1, and a connecting member is connected between the ends of the rods of these support jacks 19 and 19. 34, and the base ends of the horizontal guide rods 20 and 20 having a fixed length are fixed and supported at both ends of the connecting member 34, and the horizontal guide rods 20 and 20 are supported from both ends of the connecting member 34. Protruding in parallel toward the front with a fixed distance from each other, and aging when dismantling the lining segments that make up the existing pipeline P1 on these horizontal guide rods 20 and 20 The segment S1 is suspended and installed in the existing pipe line P1. Movably inserted through both side portions in the longitudinal direction of the removal means 21 for transferring onto the roller conveyor 26, and is supported.

  A plurality of shield jacks 23 are attached to the inner peripheral surface of the rear end 1b of the shield main body 1 at predetermined intervals in the circumferential direction, and the rod end of the shield jack 23 is connected to the front end of the new pipe P2. By extending in the received state, the shield body 1 is propelled by taking a reaction force on the new pipeline P2. Further, an erector 24 for assembling a new segment S2 to form a new pipeline P2 is disposed in the front end portion of the rear barrel 1b.

  When the existing pipe P1 is updated to the new pipe P2 by the tunnel excavating apparatus for renewing the existing pipe constructed as described above, the bulkhead 2 of the shield body 1 is placed in the existing pipe P1 as shown in FIGS. A support frame 25 having a rectangular frame shape for supporting a front end portion and an intermediate portion of the center shaft 5 protruding from the front and rear is slidable in the front-rear direction. The leg pieces 25a projecting from the three sides of the section are detachably crimped and fixed to the inner peripheral surface of the existing pipe line P1, and the both leg pieces of the supporting leg base 25 on the inner bottom surface of the existing pipe line P1. A roller conveyor 26 is arranged from the position below the front end of the horizontal guide rods 20 and 20 to the position below the front vicinity of the center shaft 5 using the space between 25a and 25a. From the front end to the inner bottom surface of the existing pipeline P1, to the front end of the existing pipeline P1, that is, to the shield body 1 arrival side A dismantling segment transport carriage 27 that travels on rails is provided.

  Further, a horizontal guide rod 28 is projected forward from the upper end of the support base 25 that supports the front end portion of the center shaft 5, and is transported to the horizontal guide rod 28 from above the conveyance end portion of the roller conveyor 26. An electric hoist 29 for transferring the dismantling segment S1 to the carriage 27 is suspended so as to be movable back and forth. In addition, the bypass pipe P3 is piped from the existing pipe P1 through the center shaft 5 and the shield body 1 to the rear of the new pipe P2. If the existing pipe P1 is a sewer pipe, Construction is performed while sewage is circulated in the bypass pipe P3 without stopping the flow. The center shaft 5 is not necessarily provided. The center shaft 5 is fixed to the partition wall 2 in a state where the fixing member 12 made of a short cylinder projecting from the rear wall 2b of the partition wall 2 is penetrated in the front-rear direction of the partition wall 2. Then, the bypass pipe P3 may be piped through the fixing member 12.

  In this state, the rod E of the shield jack 23 is extended by applying a reaction force to the front end face of the newly constructed pipeline P2 for one ring of the new segment S2 by the erector 24 in the rear body 1b of the shield body 1. When the outer cylinder 3 is rotated by operating the rotation drive mechanism 4, the ground around the existing pipe line P1 is moved by the cutter bit 7 attached to the front end of the outer cylinder 3 while moving forward integrally with the shield body 1. Excavate. Further, the inner cylinder 6 in which the back plate 6b is supported by the fixing member 12 protruding from the rear wall 2b of the partition wall 2 of the shield body 1 via the supporting member 11 is also moved forward together with the outer cylinder 3 and its front end. The scraped blade 9 projecting from the scraper blade 9 scrapes off the cured layer of the backing agent fixed to the outer peripheral surface of the existing pipe line P1, and scrapes off the scraped piece in the cured layer. The jet bit 10 is jetted from the jet nozzle 10 facing between the adjacent blades 9 and 9 and the cutter bit 7 peels off the scraped pieces from the outer peripheral surface of the existing pipe line P1 by this jet water. Together with the excavated earth and sand, it is taken into the earth and sand discharge passage 8 formed between the opposed surfaces of the inner and outer cylinders 3 and 6 communicating with the earth and sand intake port 8a.

  The earth and sand discharge passage 8 is filled with the muddy water supplied to the muddy water chamber 13 through the mud pipe 14, and the excavated earth and sand is mixed in the muddy water and taken into the muddy water chamber 13 from the earth and sand discharge passage 8. It is discharged from the mud pipe 15 through the new pipe P2 already installed behind the shield body 1 while being stirred by the scraper 16 protruding from the back plate 3a of the outer cylinder 3 in the muddy water chamber 13. The When the shield body 1 moves forward, the center shaft 5 projecting forward from the center of the partition wall 2 of the shield body 1 is also supported on the support foot 25 while being supported by the support foot 25. Move forward.

  In addition, when the shield body 1 reaches the pipeline portion of the existing pipeline P1 where the curved construction is performed and the outer peripheral ground is dug along the curved outer peripheral surface of the pipeline portion, the bent jack 22 is expanded and contracted. The rear barrel 1b is refracted in the direction of the tube axis of the existing pipe line P1 curved through the middle bent portion 1c, so that the rear end portion is supported by the front end partition wall 2 of the front barrel 1a. The outer cylinder 3 is tilted integrally with the front barrel 1a, and the excavation direction is directed to the pipe axis direction of the existing pipe line P1.

  On the other hand, the fixing member 12 provided with the support member 11 supporting the rear end portion of the inner cylinder 6 tilts integrally with the front barrel 1a, but the inner cylinder 6 has a convex arc-shaped curved outer periphery of the support member 11. Since the concave arc-shaped curved inner peripheral surface 6d of the ring member 6c fixed to the center portion of the back plate 6b is fitted on the surface 11a so as to be slidable in the front-rear and left-right directions, these uneven curved surfaces 6d , 11a interrupts the transmission of the operating force to tilt the front barrel 1a to the inner cylinder 6. However, since the inner blade 6 is in contact with the outer peripheral surface of the existing pipe line P1 by the turning blade 9 attached to the front end thereof, the direction of the pipe axis of the existing pipe line P1 is determined by the concave and convex curved surfaces 6d and 11a. The existing pipe P1 is propelled on the existing pipe P1 integrally with the outer cylinder 3 while being automatically oriented in the direction, and the existing ground pipe P1 that is curved by the outer cylinder 3 is straightly installed on the outer periphery of the existing pipe P1. After the excavation, the excavation section is fixed to the outer peripheral surface of the existing pipe line P1 which is curved by the cutting blade 9 attached to the front end of the inner cylinder 6. Scrape off the cured layer of the backing layer.

  As described above, the inner cylinder 6 is not rigidly connected to the outer cylinder 3 via the partition wall 2, but as described above, inside the concave arc-shaped curve of the ring member 6c provided integrally with the back plate 6b. The peripheral surface 6d is supported so as to be slidable in the front-rear and left-right directions with respect to the convex arc-shaped curved outer peripheral surface 11a of the support member 11 fixed to the front end of the fixing member 12 protruding from the central portion of the partition wall of the shield body 1. Therefore, even if the outer cylinder 3 is finely moved in the vertical and horizontal directions during excavation, the fine movement is not absorbed by the sliding of the concave and convex arcuate curved surfaces 6d and 11a and transmitted to the inner cylinder 6. The outer cylinder 3 can smoothly dig without receiving any influence from the inner cylinder 6.

  The outer cylinder 3 has a center of refraction at the center on the vertical surface of the bent portion where the front cylinder 1a and the rear cylinder 1b are refractably joined to each other, and the center of refraction of the inner cylinder 6 is the back plate 6b. The inner and outer cylinders 3 and 6 can be deflected so as to smoothly and smoothly follow the curved surface of the existing pipeline P1 in the bending direction of the existing pipeline P1. . In addition, not only when the existing pipeline P1 is constructed in a curved line as described above, but also in a pipeline portion that is constructed in an inclined shape or a pipeline portion that is constructed in a meandering manner, the same as above It is possible to dig while automatically directing the inner and outer cylinders 3 and 6 in the pipe axis directions of these pipe sections. In addition, when propelling the front cylinder 1a integrally with the outer cylinder 3, the lubricant is injected from the inside of the front cylinder 1a onto the outer peripheral surface of the front cylinder 1a through the lubricant injection port 30 provided in the front cylinder 1a. Promote smoothly.

  As the outer peripheral ground of the existing pipe line P1 is excavated by the front end cutter bit 7 of the outer cylinder 3 propelled integrally with the shield body 1, the rear end part of the existing pipe line P1 to be disassembled next is relative to the inner cylinder 6. When the lining segment having a length of one ring or more in the existing pipe line P1 is taken into the inner cylinder 6, the shield jack 23 is contracted and the rear body 1b of the shield body 1 is retracted. In addition, a space that can be assembled for one ring of the new segment S2 is provided between the front end face of the new pipe P2 that has already been constructed up to the rear barrel 1b and the lot end of the shield jack 23. Thus, a plurality of segments S2 are sequentially connected in the circumferential direction to form a one-ring lining segment that extends to the front end face of the new pipeline P2, thereby extending the new pipeline P2.

  Note that a lubricant is injected into the front end portion of the rear body 1b of the shield body 1 to smoothly advance the shield body 1 by injecting a lubricant onto the outer peripheral surface of the rear body 1b when the shield body 1 is advanced. An inlet 31 is provided, and a sealing material 32 that presses against the outer peripheral surface of the front end portion of the newly installed pipe line P2 is provided around the inner peripheral surface of the rear end portion of the rear barrel 1b. Further, the center shaft 5 protruding forward from the partition wall 2 of the shield body 1 is provided with a material conveying facility (shown in FIGS. 2 to 4) on the inner bottom surface thereof. Various materials can be carried in and out between the existing pipeline P1 and the new pipeline P2.

  On the other hand, in the inner cylinder 6 covering the rear end of the existing pipe P1, a plurality of aging segments forming a lining segment for one ring at the rear end of the existing pipe P1. When S1 is sequentially separated and disassembled by removing the bolts connecting adjacent segments S1, S1, the swivel ring 18 is rotated by an electric motor or the like and disposed on the swivel ring 18. The horizontal guides projecting from both ends of the connecting member 34 connecting the tips of the support jacks 19, 19 by directing the tip of the support jacks 19, 19 in the direction of one segment S1 to be disassembled After the removal means 21 slidably disposed on the rods 20 and 20 is opposed to the segment S1 to be disassembled, the tip chuck portion of the removal means 21 is extended by extending the rods of the support jacks 19 and 19. In segment S1 Grab a projecting piece (not shown) attached to the center of the center of the surface, and then shrink the rod of the support jack 19 and rotate the swiveling ring 18 by a predetermined angle to direct the removal means 21 downward, In this state, the removal means 21 that suspends the segment S1 is moved forward along the horizontal guide rods 20 and 20, and the segment S1 is suspended and placed on the conveyance start end of the roller conveyor 26.

  While the segment S1 transferred on the roller conveyor 26 is conveyed by the transfer end portion Nima of the roller conveyor 26 and reaches the end portion, it is lifted by the electric hoist 29 and transferred onto the transport carriage 27, After the removal means 21 is retracted to the original position, the turning ring 18 provided with the removal means 21 is turned in the circumferential direction by an electric motor or the like to move the removal means 21 onto the next segment S1, and the same as above. The segment S1 is transported from the removing means 21 to the transport carriage 27 via the roller conveyor 26 and the electric hoist 29.

  Thus, when a plurality of segments S1 forming a lining segment for one ring at the rear end portion of the existing pipeline P1 are carried out to the arrival side through the existing pipeline P1 by the transport carriage 27, the shield jack is again provided. A cutter attached to the tip of the outer cylinder 3 by advancing the shield body 1 by extending 23 and advancing the inner and outer cylinders 3 and 6 integrally with the shield body 1 prior to the shield body 1. Excavation of the outer peripheral ground of the existing pipe line P1 by the bit 7 and the back fixed to the outer peripheral surface of the existing pipe line P1 by the piercing blade 9 attached to the tip of the inner cylinder 6 and jet water from the injection nozzle 10 By removing the hardened layer of the filler and sending it to the muddy water chamber 13 through the earth and sand carrying passage 8 between the inner and outer cylinders 3 and 6 together with the excavated earth and sand, and removing it backward through the sending and discharging mud pipes 14 and 15 Drilling a tunnel with a length equivalent to one ring on the outer periphery of P1, and shrinking the shield jack 23 and assembling the new segment S2 into a ring shape with an elector in the rear trunk 1b, at the front end of the new pipeline P2 By repeating the process of connecting and extending the new pipeline P2, and the process of dismantling and removing one ring of the aging segment S1 at the rear end of the existing pipeline P1 in the existing pipeline P1 The existing pipeline P1 is updated to the new pipeline P2.

  Further, before the rear end portion of the next existing pipe line P1 is disassembled for a certain length, the support leg 25, the roller conveyor 26, etc. are moved to the next dismantling segment carry-out position. The existing pipe line P1 to be dismantled is a pipe line in which secondary lining concrete is provided on the inner peripheral surface of the primary lining segment, and the secondary lining concrete is first crushed and removed. It may be a pipe line composed of a primary lining segment of the traces made. Also, even if the existing pipeline P1 ′ made of a fume pipe is not an existing pipeline made of a lining segment, the existing tunnel P1 ′ is dismantled and removed, and the new tunnel P2 is replaced by the above-described renewal tunnel excavator. Can be updated.

  FIG. 7 shows an embodiment of the shield, with the outer peripheral surface of the existing pipe line P1 ′ made of a fume pipe covered by the outer and outer cylinders 3 and 6 disposed on the front surface of the shield body 1 in a shielded state. By propelling the main body 1, the outer peripheral ground of the existing pipe line P1 'is excavated by the cutter bit 7 attached to the tip of the outer cylinder 3, and the cutting blade 9 attached to the tip of the inner cylinder 6 and the injection It is fed into the muddy water chamber 13 through the sediment transport passage 8 between the inner and outer cylinders 3 and 6 together with the excavated sediment while scraping off the hardened layer of the backing agent adhering to the outer peripheral surface of the existing pipe P1 'by the jet water from the nozzle 10. The tunnel is excavated on the outer periphery of the existing pipe line P1 ′ by removing it backward through the sending and discharging mud pipes 14 and 15, and after excavating the tunnel of a certain length, the shield body 1 is propelled relative to the inner cylinder 6 The rear end of the existing pipeline P1 ' Removal means for cutting the block-shaped small piece P11 along the horizontal guide rods 20 and 20 by cutting into a plurality of block-shaped small pieces P11 by a cutting machine (not shown) carried into the rear end of the pipe line P1 ′ It is gripped by 21, transferred to the roller conveyor 26, and conveyed to a transport cart (not shown) via an electric hoist 29 disposed on the rear side.

  On the other hand, in the rear barrel 1b ′ of the shield body 1, the new pipeline P2 ′ is extended in accordance with the removal length of the existing pipeline P1 ′. This extension is performed by the erector 24 in the rear barrel 1b ′. This may be done by assembling S2, but in this embodiment, the existing pipe line P1 'is dismantled and removed from the starting side shaft (not shown) of the shield body 1 in accordance with the propulsion of the shield body 1, and a predetermined length is obtained. Each time a tunnel is excavated, a new pipe P2 'is formed by pushing a new fume pipe into the start shaft while pushing it forward. Therefore, it is not necessary to dispose the erector 24 in the rear cylinder 1b 'of the shield body 1, the length of the rear cylinder 1b' can be shortened, and the shield jack 23 is unnecessary. Since the other embodiments are the same as the above-described embodiment shown in FIG. 1, the same portions are denoted by the same reference numerals, and detailed description thereof is omitted.

P1 Existing pipeline
P2 New pipeline
S1 Existing segment
S2 New segment 1 Shield body 2 Bulkhead 3 Outer cylinder 4 Rotation drive mechanism 5 Center shaft 6 Inner cylinder 7 Cutter bit 8 Sediment discharge passage 9 Blade
10 Injection nozzle
13 Mud chamber
18 Swivel ring
21 Means of removal
22 Broken jack
25 Support footrest

Claims (3)

Dismantle existing pipeline from its rear end, a update tunneling device of the existing pipeline to continue to form a new line with advances rear side according to remove, together refracted by bending jacks among a plurality of An inner cylinder that covers the outer peripheral surface of the rear end of the existing pipe line on the front side of the shield body consisting of a freely connected front and rear cylinders, and the front end of the inner cylinder is placed forward of the front end of the inner cylinder. An outer cylinder protruding from the front cylinder and a front outer peripheral part of the partition wall provided at the front end of the front barrel is rotatably supported on the outer peripheral part of the rear plate of the outer cylinder and the front central part of the partition wall A fixing member is protruded through the center of the back plate of the outer cylinder, and the back plate of the inner cylinder is supported by the front end of the fixing member so as to be able to bend in the vertical and horizontal directions. Scrape off the hardened layer such as backing agent that is in sliding contact with the outer peripheral surface of the existing pipe line Ri While projecting blade, Yes wearing the plurality of cutter bits for excavating an outer ground of the existing pipeline in the front end of the outer tube, further, the inner and the front surface of the back plate of the outer cylinder at the periphery of the fixing member A space between the rear surfaces of the back plate of the cylinder is formed in a muddy water chamber communicating with the rear end of the excavation sediment discharge passage formed between the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder. An existing pipe characterized in that a mud pipe is connected to discharge excavated earth and sand through the feed / drain mud pipe, and a rotary drive mechanism for the outer cylinder is disposed in the partition wall of the seal body. Tunnel excavator for road renewal.   The whirling blades protrude from the front end of the inner cylinder at regular intervals in the circumferential direction, and the jet water spray nozzle faces forward between the adjacent whirling blades. Further, the front end of the inner cylinder The tunnel excavator for renewal of an existing pipeline according to claim 1, wherein a sealing material slidably in contact with the outer circumference of the existing pipeline is attached to the inner circumferential surface of the section. A cylindrical center shaft projects from the center of the front face of the partition wall of the shield body through the fixed member, and projects from the existing pipe line into the new pipe line through the shield body. The tunnel excavator for renewing an existing pipeline according to claim 1, wherein the bypass pipe is inserted and disposed.

Images