JP5599346B2 - 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 And a cylindrical hood body that covers the existing pipe line in a watertight state through a sealant and has a rear end sealed by an end face plate, and is connected to a partition wall behind the cutter in the tunnel excavator. As a connecting structure between the end plate of the cylindrical hood body 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 endplate is moved up and down at the rod end of the jack. It employs a swing freely linked structure in the right direction.

  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. Therefore, not only the resistance to digging of the cylindrical hood increases, but also when there is gravel in the ground, it may be difficult to dig while crushing the gravel. In addition, because there is no earth and sand discharge passage excavated by the cylindrical hood body, it is sent to the rear tunnel excavator side through the outer peripheral surface of the cylindrical hood body, Drilling efficiency can not be smoothly eliminated cutting soil there is a problem that decreases.

  In addition, the cylindrical hood covering the existing pipe is not provided with the existing pipe even when the existing pipe has an inclined part, a meandering part, or a curved part such as a curved part. It is possible to dig while changing the direction of the existing pipe line along the outer peripheral surface such as the inclined part or curved part of the road, but the tunnel excavator disposed behind the existing pipe line is Regardless of the curved part such as the inclined part or curved part of the pipeline, its orientation can be changed via the middle jack, so that its axis is vertically and horizontally with respect to the pipe axis of the existing pipeline Due to the displacement, it becomes impossible to accurately construct the new pipeline at the position where the existing pipeline is buried. For this reason, it is necessary to control the tunnel excavator in such a manner that the digging direction is synchronized with the propulsion direction of the cylindrical hood body.

  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 object of the present invention is to efficiently remove the outer peripheral ground of an existing pipeline such as an aged sewer pipe along the pipe axis direction of the existing pipeline and Provided is a tunnel excavation device for renewing an existing pipeline, which can update an existing pipeline to a new pipeline while excavating accurately and can construct a new pipeline having the same diameter as the existing pipeline. It is in.

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 device for renewing an existing pipeline that forms a new pipeline, the front side of the shield body comprising a front barrel and a rear barrel that are flexibly connected to each other by a plurality of middle folding jacks And an outer cylinder that covers the outer peripheral surface of the rear end portion of the existing pipe line and is fitted with a cutter bit for excavating the outer peripheral ground of the existing pipe line at the front end, and the existing pipe line at the front end behind the cutter bit. A jet of a hardened layer of a backing agent or the like fixed to the outer peripheral surface is projected, and a plurality of jet water jet nozzles are arranged forward on the inner peripheral surface of the front end portion, and the jet nozzle On the outer peripheral surface of the existing pipe line on the inner peripheral surface on the rear side of And a inner cylinder made of wearing the contact sealing member, is provided with a discharge passage of the excavation soil between the facing surfaces of the inner and outer circumferential surfaces of the inner tube of the outer tube, further, the front end of the front barrel A partition wall is provided in the partition, and the outer peripheral portion of the outer cylinder is supported on the outer periphery of the partition wall so as to be rotatable around the center of the outer cylinder, and a rotation driving mechanism for the outer cylinder is disposed in the partition wall. A fixing member is projected from the center of the front surface of the partition wall, and a support member having an outer peripheral surface formed as a convex arcuate curved surface is fixed to the front end of the fixing member to form a convex arcuate curved surface of the support member. A concave arcuate curved surface provided at the central portion of the back plate of the inner cylinder is fitted so that it can be bent in the vertical and horizontal directions .

Further, in the invention according to claim 2 , the fixing member protruding from the front center portion of the partition wall is formed of a short cylindrical body, and a cylindrical center shaft is directed forward to the front center portion of the partition wall through the fixing member. , And a bypass pipe is connected from the existing pipe line to the new pipe line through the center shaft.

According to a third aspect of the present invention, the space between the opposing surfaces of the outer cylinder back plate and the inner cylinder back plate around the fixing member is between the opposing surfaces of the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder. It is formed in a muddy water chamber that communicates with the rear end of the excavated earth and sand discharge passage provided in the pipe. Yes.

  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. An outer cylinder in which the outer peripheral surface of the rear end portion of the existing pipe line is covered on the front side of the shield body and a cutter bit for excavating the outer peripheral ground of the existing pipe pipe is mounted on the front end, and the rear side of the cutter bit on the front end And a plurality of jet water injection nozzles are disposed forwardly on the inner peripheral surface of the front end portion and projecting a blade of a hardened layer such as a backing agent fixed to the outer peripheral surface of the existing pipeline. The outer circumference of the rear end portion of the existing pipe line by the cutter bit attached to the front end of the outer cylinder while preceding the inner cylinder by advancing the shield main body while rotating the outer cylinder Just excavating the ground efficiently Without it can be accurately excavating a tunnel centered concentrically constant diameter and the existing pipeline the existing pipe line, it is possible to construction a new pipeline accurately in the excavation marks.

  In addition, the inner cylinder can be smoothly driven after the outer cylinder excavating the outer peripheral ground of the existing pipe line, and the seal that is in sliding contact with the outer peripheral surface of the existing pipe line on the inner peripheral surface of the front end of the inner cylinder Since the material is mounted, it is possible to excavate the outer peripheral ground of the existing pipeline while reliably preventing groundwater and earth and sand from entering the existing pipeline through the inner cylinder. Further, by removing the fixing layer such as the back-filling agent fixed to the outer peripheral surface of the existing pipe line by the cutting blade protruding from the front end of the inner cylinder, the dismantling work of the existing pipe line after the dredging is facilitated. In addition, it can be formed between the inner and outer cylinders together with the earth and sand excavated by the cutter bit of the outer cylinder while peeling off the outer peripheral surface of the existing pipe line by jet water jet from the injection nozzle It can be smoothly discharged into the shield body through the earth and sand discharge passage.

  Further, since the rear end portions of the outer cylinder and the inner cylinder are connected to the shield body so as to be able to bend vertically and horizontally, an inclined portion, a meandering portion, a curved portion or the like is added to the existing pipeline while the existing pipeline is being updated. Even if there is a curved portion, these inner cylinder and outer cylinder can smoothly dig along the outer peripheral surface of the existing pipe line while changing its direction to the pipe axis direction of the existing pipe line, It is possible to accurately update a new pipeline having the same sloped part or curved part as the sloped part or curved part of the existing pipe line on the rear side of the shield main body. Since the outer peripheral ground at the rear end is excavated by the cutter bit of the outer cylinder, the outer diameter of the shield body is formed to be the same diameter as or smaller than the outer diameter of the outer cylinder, and the tunnel is excavated in accordance with the excavation of the outer cylinder. This shield body can be smoothly advanced while following the outer cylinder. Well, construction of new pipeline having the same outer diameter as the outer diameter of the existing pipe into the rear portion of the shield body becomes possible, updating of the conduit can be achieved efficiently performed by shortening the work period.

Furthermore, according to the present invention, a fixing member is protruded from the front central portion of the partition wall provided at the front end of the shield body, and a support member having an outer peripheral surface formed as a convex arcuate curved surface is fixed to the front end of the fixing member. Since the concave arcuate curved surface provided in the central part of the back plate of the inner cylinder is refractably fitted to the convex arcuate curved surface of the support member in the front / rear / left / right direction, Can be automatically and smoothly refracted in the direction of the tube axis of the existing pipe along the outer peripheral surface of the existing pipe, and the operation thereof can be performed by the concave and convex arcuate curved surface. Even if the outer cylinder that is excavated along the outer peripheral surface of the existing pipeline is slightly operated in the vertical and horizontal directions during excavation, the inner cylinder is operated in a direction that absorbs the fine operation alone. However, the outer circumference of the existing pipe line is excavated by the outer cylinder without being affected by the inner cylinder. It can be carried out in.

In addition, the shield body is composed of a front cylinder and a rear cylinder that are refractably connected to each other by a plurality of middle-folding jacks, and a rear end outer peripheral part of the outer cylinder is provided on an outer peripheral part of a partition wall provided at a front end part of the front cylinder. Since the outer cylinder rotation drive mechanism is disposed on the partition wall, the outer cylinder is integrated with the outer cylinder rotation drive mechanism in the vertical and horizontal directions with respect to the rear body of the shield body. It can be refracted, and its direction can be easily changed in the direction of the tube axis of the existing pipe line together with the inner cylinder supported by the front end supporting member of the fixing member protruding from the partition wall. Thus, the existing pipeline can be updated accurately and efficiently.

According to the second aspect of the present invention, the fixing member projecting from the front central portion of the partition wall is formed of a short cylindrical body, and the cylindrical center is directed forward to the front central portion of the partition wall through the fixing member. When the existing pipe is made of sewage pipes, a bypass pipe is constructed from the existing pipe line through the center shaft to the new pipe line through the center shaft. In this case, it is possible to dismantle old pipes and renew new pipes while passing sewage through the bypass pipe without stopping the flow of sewage, and insert the bypass pipe into the center shaft. Since it is supported, a relatively wide working space is secured around the bypass pipe so that the existing pipe can be easily disassembled around the bypass pipe. Rukoto can, therefore, can be the demolition work or the like in the existing conduit is smoothly performed.

According to the invention of claim 3 , the space between the opposing surfaces of the back plate of the outer cylinder and the back plate of the inner cylinder around the fixing member is between the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder. It is formed in a muddy water chamber that communicates with the rear end of the drilling earth and sand discharge passage, and the muddy water chamber is configured to communicate with the sending and discharging mud pipe and to discharge the drilling earth and sand through this sending and discharging mud pipe. The excavation by the shield main body can be efficiently performed while discharging the earth and sand excavated by the front end cutter bit of the outer cylinder from the shield main body to the start vertical shaft side through the new pipe line.

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 simplified vertical side view which shows the state which refracted the inner and outer cylinders. 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, and this junction is formed as a bent part 1c that can be bent vertically and horizontally. In addition, the inner peripheral surfaces of these front and rear cylinders 1a and 1b are connected by a plurality of middle folding jacks 22 arranged at predetermined intervals in the circumferential direction, and the operation of the middle folding jack 22 causes the front trunk 1a to be connected. The front end portion of the rear barrel 1b is configured to be refracted from the middle bent portion 1c.

  The central part of the partition wall 2 in which the outer peripheral end surface is integrally fixed to the inner peripheral surface of the front end opening 1a of the front body 1a of the shield body 1 is recessed backward and has a certain depth depth opened forward. A concave portion 2a having a front circular shape is formed, and a central portion of a rear end of an outer cylinder 3 to be described later is rotatably supported in the concave portion 2a. The outer cylinder 3 is configured to be driven to rotate around the center thereof, and an existing pipe is formed in the front central portion of the rear wall 2b of the partition wall 2 forming the bottom wall 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 path P1 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. 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. The small gear 4c, which is fixed to the rotation shaft through the rotation shaft of the drive motor 4b in a watertight manner through the rear wall portion 2b, meshes with the internal gear 4a, and the internal gear meshed with the drive motor 4b. The rotational drive mechanism of the outer cylinder 3 is constituted by 4a and the small gear 4c. The rotation center of the outer cylinder 3 is coaxial with the shield body 1 and is configured to advance integrally with the shield body 1 while rotating.

  A sealing material 6a that is 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 the outer cylinder. In the vicinity of the rear end of the inner end portion of the cutter bit 7 attached to the front end of No. 3, the inner end of the inner cylinder 6 is slidably contacted with the outer peripheral surface of the existing pipe line P1 and 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 projected 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 the jet water supply means disposed in the shield body 1 (Not shown) is connected and communicated. The injection nozzle 10 penetrates the sealing material 6a in a watertight manner, and the tip of the injection nozzle 10 faces the earth and sand intake port between the adjacent cutter bits 7 and 7.

  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 outer cylinder 11a is fitted to the outer circumferential surface 11a so as to be slidable in the front-rear and left-right directions, and the inner circumferential surface 6d of the ring member 6c is slid on the curved outer circumferential surface 11a of the support member 11, thereby The direction can be changed.

  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 and supported concentrically with 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 spaced apart from each other by a fixed distance. Are projected in parallel from both ends of the connecting member 34 in the forward direction, and the aging when disassembling the lining segments constituting the existing pipe line P1 on these horizontal guide rods 20, 20 The segment S1 is suspended and installed in the existing pipe line P1. Inserting the both end portions of the removal means 21 for transferring onto the roller conveyor 26 to be movable in the front-rear direction, 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 disposed from the position below the tip of the horizontal guide rod 20 to the position below the front vicinity of the center shaft 5 using the space between 25a and 25a, and from the front end of the roller conveyor 26 Within the existing pipeline P1 up to the front end of the existing pipeline P1, that is, to the reach side of the shield body 1 Providing a demolition segments carrying carriage 27 which travels on a rail to the surface.

  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, and the fixing member 12 made of a short cylinder body that supports the inner cylinder 6 projecting from the rear wall 2b of the partition wall 2 is bent in the front-rear direction of the partition wall 2. Alternatively, the bypass pipe P3 may be configured to be fixed to the partition wall 2 and penetrated through the fixing member 12 in a penetrating state.

  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. Scrape off the hardened layer of the backing agent, etc., fixed to the outer peripheral surface of the existing pipe line P1, with the scissors blade 9 protruding to the surface, and scrape it off toward the scraped hardened layer. Jet water is sprayed from the spray nozzle 10 facing between the turning blades 9, 9, and the hardened layer is peeled off from the outer peripheral surface of the existing pipe line P 1 by this jet water, and the peeled piece is removed by the cutter bit 7. Is taken into the earth and sand discharge passage 8 formed between the opposing surfaces of the inner and outer cylinders 3 and 6 communicating with the earth and sand intake 8a together with the earth and sand excavated by the above.

  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 protruding forward from the center of the partition wall 2 of the shield body 1 is also moved forward on the support leg 25 while being supported by the support leg 25. Moving.

  Further, when the shield body 1 reaches the pipeline portion of the existing pipeline P1 where the curved construction is performed and digs up the outer peripheral ground along the curved outer peripheral surface of the pipeline portion, the middle jack 22 is operated. Then, the rear end of the front barrel 1a is supported by the front end partition wall 2 of the front barrel 1a by refracting the front barrel 1a with respect to the rear barrel 1b in the direction of the tube axis of the existing pipe line P1 that is bent through the middle bent portion 1c. The outer cylinder 3 is tilted integrally with the front cylinder 1a, and the excavation direction is directed to the pipe axis direction of the existing pipe line P1 (see FIG. 7).

  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 arcuate curved inner peripheral surface 6b 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 6b , 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 with the screed 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 6b and 11a. The existing pipe line P1 is propelled on the existing pipe line P1 integrally with the outer cylinder 3 while automatically directing in the direction, and the outer circumference ground of the existing pipe line P1 curved by the outer cylinder 3 is straightly installed. 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 hardened layer of the backing agent.

  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 moves finely 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 is not transmitted to the inner cylinder 6. The outer cylinder 3 can dig smoothly without receiving any influence from the inner cylinder 6.

  Further, the center of refraction of the outer cylinder 3 is 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 rod of the support jack 19 is extended so that the tip chuck portion of the removal means 21 Within 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 placed on the roller conveyor 26 is transported to the transport terminal end of the roller conveyor 26 and reaches the terminal end, it is lifted by the electric hoist 29 and transferred onto the transport cart 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. 8 shows an embodiment of the shield, in which the outer peripheral surface of the rear end portion of the existing pipe line P1 ′ made of a fume pipe is covered with the inner and outer cylinders 3 and 6 disposed on the front surface of the shield body 1. 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 according to 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 body 1b ′ of the shield body 1, and further, the shield jack 23 is not necessary. 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
1a Front trunk
1b Rear barrel 2 Bulkhead 3 Outer cylinder 4 Rotation drive mechanism 5 Center shaft 6 Inner cylinder
6d Concave arc-shaped curved surface 7 Cutter bit 8 Sediment discharge passage 9 Saw blade
10 Injection nozzle
11 Support member
11a Convex arc curved surface
12 Fixing member
13 Mud chamber
22 Broken jack

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 A cutter bit that covers the outer peripheral surface of the rear end of the existing pipe line and excavates the outer peripheral ground of the existing pipe pipe at the front end on the front side of the shield main body constituted by the freely connected front and rear cylinders. The outer cylinder that is mounted, and the edge of the hardened layer such as a backing agent that sticks to the outer peripheral surface of the existing pipe line at the front end behind the cutter bit are projected and the inner peripheral surface of the front end portion A plurality of jet water spray nozzles are arranged toward the front, and an inner cylinder is formed by mounting a sealing material pressed against the outer peripheral surface of the existing pipeline on the inner peripheral surface on the rear side of the jet nozzle, The excavated soil is between the opposing surface of the inner circumference of the outer cylinder and the outer circumference of the inner cylinder. Is provided with an outgoing path, further, with which it is rotatably supported the rear end outer peripheral portion of the outer tube about the center of the outer tube to the outer peripheral portion of the partition wall provided with a partition wall in the front end of the front body A support member in which an outer cylinder rotational drive mechanism is disposed on the partition wall, and a fixing member projects from the front central portion of the partition wall, and an outer peripheral surface is formed as a convex arcuate curved surface at the front end of the fixing member And a concave arcuate curved surface provided at the center of the back plate of the inner cylinder is refractably fitted vertically and horizontally to the convex arcuate curved surface of the support member. Tunnel excavator for pipe renewal. The fixing member protruding from the center of the front surface of the partition wall is a short cylinder, and a cylindrical center shaft is projected forward from the center of the front surface of the partition wall through the fixing member. The tunnel excavator for renewal of an existing pipeline according to claim 1, wherein the bypass pipeline is piped from the existing pipeline to the new pipeline. An excavation sediment discharge passage in which a space between the opposing surfaces of the back plate of the outer cylinder and the back plate of the inner cylinder around the fixing member is provided between the opposing surfaces of the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder. 2. The existing pipe according to claim 1, wherein the existing pipe is formed in a muddy water chamber communicating with the rear end, and is configured such that a mud pipe is communicated with the muddy water chamber and excavated sediment is discharged by the mud pipe. Tunnel excavator for road renewal.

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