JP2012077505A - Stop valve device and tunnel excavator equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stop valve device capable of avoiding extension of a construction period and an increase in cost by effectively reinforcing packing so as to lengthen its life, and a tunnel excavator equipped with the device.SOLUTION: A stop valve device includes a jack 62 which is attached to a base end side of a straight pipe portion 50a formed by making a branch pipe portion 50b branch off in a Y-shape, and a rod-like piston 63 which is attached to a leading end of a piston rod of the jack 62 and which can slide in the straight pipe portion 50a so as to pass through the branch portion. A backside of first packing 67 attached to a leading end of the rod-like piston 63 is reinforced with a metal cover 67b.

Description

  The present invention relates to a closing valve device used in a lining method by ECL (Extruded Concrete Lining) and a tunnel excavator provided with the device.

  As a tunnel excavator employing the lining method, a mud pressure shield excavator is well known (see Patent Document 1). This is to excavate the ground with a cutter head provided on the front surface of the cylindrical excavator body, and cover the inner wall surface of the tunnel that has been dug with an inner mold frame at a predetermined interval. Concrete is placed by direct placement (place-in-place) by appropriately placing reinforcing bars between the inner wall surface, etc., and lining is performed after curing and hardening. Such a lining method is generally referred to as an ECL or direct-concrete concrete method.

  In the mud pressure shield excavator as described above, a ring-shaped wife mold (device) for closing the space between the inner wall surface of the tunnel and the inner mold is provided, and through the wife mold, the ring mold While concrete is cast, the wife form frame can be slid in the front-rear direction (longitudinal direction of the tunnel) through the expansion and contraction of the wife form frame jack.

  Moreover, there exists a thing disclosed by patent document 2 as a concrete placement apparatus used for the said lining method. This is because the end side of the straight pipe part in the concrete casting pipe is inserted and fixed to the end form, while the branch pipe part is branched in a Y shape from the base end side of the straight pipe part. A concrete placement pipe leading to the concrete supply source is detachably connected.

  A blocking valve device having a jack and a rod-like piston attached to the tip of the piston rod of the jack is connected to the base end of the straight tube portion, and the branch pipe portion is straightened by the retraction of the rod-like piston when the jack contracts. While it is possible to place concrete by communicating with the pipe part, when the jack is extended, the communication between the branch pipe part and the straight pipe part is blocked by the advance of the rod-shaped piston, and the residual concrete in the straight pipe part is placed in the placement space. To be pushed out. When the jack is extended, the branch pipe portion is washed with high-pressure washing water.

JP 2001-173387 A JP 2006-291636 A

  By the way, the rod-like piston of the above-described closing valve device is provided with a packing (also referred to as a scraper) made of rubber such as urethane at the tip.

  Therefore, when the rod-shaped piston passes through the Y-shaped branch portion between the branch pipe portion and the straight pipe portion of the concrete placing pipe due to expansion and contraction of the jack, the tip portion of the rod-shaped piston is shifted to the branch portion side. There is a problem that the packing bites concrete aggregate and the like, and in particular, the back surface of the packing is damaged and scratched.

  As a result, replacement of the packing is unavoidable, and an increase in the frequency leads to a delay in the construction period and an increase in cost for the packing.

  Therefore, the present invention has an object to provide a closing valve device that can effectively reinforce the packing, extend its life, and avoid delay in construction period and increase in cost, and a tunnel excavator equipped with the device. And

In order to achieve such an object, the closing valve device according to the present invention comprises:
A blocking valve device used for direct-concrete concrete construction,
A jack attached to the base end side of the straight pipe portion branched from the branch pipe portion in a Y shape;
A rod-like piston attached to the tip of the piston rod of the jack and slidable in the straight pipe portion so as to pass through the branch portion;
With
The back side of the packing attached to the tip of the rod-shaped piston is reinforced with a metal cover.

Also,
The packing is characterized in that the back side of the ring-shaped main body made of rubber is reinforced by a ring-shaped thin plate cover bonded to the back surface and a part of the outer peripheral surface continuous to the back surface.

In order to achieve such an object, a tunnel excavator according to the present invention is supported by a tubular excavator main body, a propulsion jack for advancing the excavator main body, and a front part of the excavator main body so as to be rotationally driven. In a tunnel excavator comprising a cutter head, a driving means for rotating the cutter head, and a concrete placing device used when lining the tunnel inner wall surface behind the excavated excavator body,
The concrete placing device includes the blocking valve device.

  According to the closing valve device according to the present invention, the life of the packing in the rod-like piston is extended by reinforcement by the metal cover, and the delay of the construction period and the increase of the cost are avoided in advance.

  According to the tunnel excavator according to the present invention, the excavation efficiency of the tunnel excavator can be enhanced because the concrete excavation device that enhances the durability of the blocking valve device is provided.

It is an expanded sectional view of the rod-shaped piston in the blocking valve device which shows one example of the present invention. It is a schematic block diagram of a mud pressure type shield excavator. It is a principal part expanded sectional view of the concrete placement apparatus part at the time of a closing valve opening. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is a principal part expanded sectional view of the concrete placement apparatus part at the time of a closing valve closing.

  Hereinafter, a blocking valve device according to the present invention and a tunnel excavator provided with the device will be described in detail with reference to the drawings.

  FIG. 1 is an enlarged cross-sectional view of a rod-like piston in a closing valve device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a mud pressure shield excavator, and FIG. 3 is a concrete placing device portion when the closing valve is open. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is an enlarged cross-sectional view of the main part of the concrete placing device when the closing valve is closed.

  The tunnel excavator described in this embodiment is a mud pressure shield excavation that builds a tunnel while stabilizing the face by filling the chamber with excavated earth and sand and maintaining the inside of the chamber at a predetermined pressure. Machine.

  In this mud pressure shield excavator, as shown in FIG. 2, the excavator main body 11 includes a front cylinder 12 and a rear cylinder 13 that are formed in a cylindrical shape having substantially the same diameter, and are connected to each other by a connecting shaft 14 so as to be bent right and left. It can be bent by a plurality of middle folding jacks 15 installed between them. A rotating ring 16 is rotatably supported on the front portion of the front barrel 12, and a cutter head 18 is connected to the rotating ring 16 via a connecting beam 17.

  The cutter head 18 is configured such that a plurality of cutter spokes 19 are arranged radially from the center portion, and the respective front end portions are connected by an outer peripheral ring 20. A fishtail cutter 21 is attached to the center of the cutter head 18, while a plurality of cutter bits 22 are attached to both sides of each cutter pork 19 along the longitudinal direction thereof. A copy cutter 23a and a rescue bit 23b for performing excessive digging are provided at the front end portion so as to freely appear and disappear.

  A ring gear 24 is fixed to the rear portion of the rotary ring 16, and a plurality of cutter turning motors (drive means) 25 are attached to the front body 12 of the excavator body 11. The drive gears 26 are meshed with the ring gear 24, respectively. Accordingly, when the cutter turning motor 25 is driven to drive the drive gear 26 to rotate, the cutter head 18 can be rotated via the ring gear 24, the rotating ring 16, and the connecting beam 17.

  In addition, a bulkhead 27 is provided at the front portion of the front cylinder 12 so as to be located behind the cutter head 18, and a chamber 28 is formed between the cutter head 18 and the bulkhead 27 for filling excavated earth and sand. Yes. A plurality of fixed stirring rods 29 project from the front side of the bulkhead 27, while a plurality of swirling stirring rods 30 project from the rear surface side of the cutter head 18. A part of the fixed stirring rod 29 is provided with a not-shown mud-material injection port for injecting a mud-material into the excavated sediment in the chamber 28, and a not-shown chemical-solution injection tube for injecting a chemical (consolidated material). Is provided.

  In the excavator body 11, a screw conveyor 33 for carrying excavated earth and sand to the outside is disposed, and a front portion thereof is inclined downward to penetrate the bulkhead 27 and open into the chamber 28. ing.

  A ring garter 34 is fixed to the rear cylinder 13 of the excavator body 11 along the inner peripheral surface thereof, and a plurality of shield jacks (propulsion jacks) 35 are arranged on the ring garter 34 in the circumferential direction of the rear cylinder 13. The excavator body 11 can be advanced by the reaction force by extending the shield jack 35 rearward and pressing the spreader 36 against the existing inner formwork (formwork) S. .

  A plurality of inner molds S are assembled in a ring shape in the circumferential direction with a predetermined interval on the inner wall surface of the tunnel (the peripheral wall of the natural ground G). The concrete is placed by direct placement (place-in-place) by a concrete placement device described later in the space (concrete placement space E) between the peripheral wall of the inner mold S and the outer peripheral surface of the inner mold S assembled in a ring shape, A tunnel is built. Further, the inner mold S is assembled in a plurality of stages in the longitudinal direction of the tunnel.

  In addition, a swivel ring 38 is supported on the ring gutter 34 so as to be able to swivel along the circumferential direction of the inner wall surface of the tunnel, and can be driven and swiveled by a drive motor (not shown). An inner mold assembly apparatus 39 is provided. Further, a pair of left and right columns 40 are fixed to the ring gutter 34, and a substantially horizontal frame 41 is extended rearward from the column 40, and this frame 41 assists in assembling the inner formwork S. A pair of front and rear shape holding devices 42 are mounted so as to be movable in the front-rear direction.

  Further, a plurality of transfer carts (not shown) are connected to the rear end of the gantry 41, and an inner mold release device for removing the inner mold S at the rear stage, and the inner mold release device are connected to these transfer carts. A hoist that transports the inner mold form S that has been removed in step 1 to the front of the tunnel, a power unit of a concrete placing device, and the like are mounted.

  Furthermore, between the rear trunk (skin plate) 13 and the inner mold S, there is a ring-shaped wife mold 46 that forms a concrete placement space E between the inner mold S and the peripheral wall of the natural ground G. In addition to being disposed, a plurality of wife form jacks 47 are arranged in parallel along the circumferential direction, and the head base end portion passes through the ring gutter 34 and is connected to the inner peripheral portion of the rear barrel 13. On the other hand, the tip end of the rod is connected to the end form frame 46.

  A rubber seal member 48 (see FIG. 3) is attached to the outer peripheral surface of the end form frame 46 along the circumferential direction, while a metal brush seal 49 is provided on the inner peripheral surface of the end form frame 46. It is mounted along the circumferential direction.

  Accordingly, the ring-shaped wife mold frame 46 can be moved back and forth by expanding and contracting the wife mold jack 47. At this time, the seal member 48 is pressed against the inner peripheral surface of the rear barrel 13, and the brush By pressing the seal 49 against the outer peripheral surface of the existing inner mold S assembled in a ring shape, it is possible to prevent water from entering the excavator body 11.

  In addition, a plurality of concrete placement pipes 50 are inserted into the end form frame 46 at a predetermined interval in the circumferential direction toward the rear of the excavation direction, and the concrete placement pipes 50 are connected to a closing valve device 60 described later. It is possible to communicate with a concrete placement pipe (hose: concrete placement line) 51 by switching between them. These concrete placement pipes 51 are communicated with a concrete supply source via the power unit on the transport carriage described above.

  Therefore, under the state where the concrete placement pipe 50 and the concrete placement pipe 51 are communicated with each other by the closing valve device 60, the ready-mixed concrete fed from the concrete supply source is connected to the concrete placement pipe 51 and the concrete placement pipe 50. It passes through the concrete placement space E described above. At this time, in the concrete placement space E, the concrete placement pipes 50 are sequentially placed in the circumferential direction.

  Further, a concrete placing device is constituted by the inner form S, the end form 46, the concrete placing pipe 50, the concrete placing pipe 51, the closing valve device 60 and the like.

  As shown in FIGS. 3 and 4, the concrete placing pipe 50 is formed in a Y-tube shape including a straight pipe portion 50 a and a branch pipe portion 50 b, and the latter half portion of the straight pipe portion 50 a is a wife mold. 46 is fixedly inserted into 46. The concrete placement pipe 51 is detachably flanged to the front end of the branch pipe portion 50b, while the blocking valve device 60 is assembled to the front end of the straight pipe portion 50a via the connecting pipe 61.

  The blocking valve device 60 includes an open / close / cleaning jack 62 connected to the front end of the connecting pipe 61 and a straight pipe portion 50a of the connecting pipe 61 and the concrete placing pipe 50 connected to the tip of the piston rod of the jack 62. And a rod-like piston 63 slidable in the axial direction.

  When the jack 62 is contracted (when contracted), the straight pipe portion 50a and the branch pipe portion 50b of the concrete placing pipe 50 communicate with each other by the retraction of the rod-shaped piston 63 (see FIGS. 3 and 4). In the limit (at the time of extension), as shown in FIG. 5, the straight pipe portion 50a and the branch pipe portion 50b of the concrete placing pipe 50 are blocked by the advance of the rod-shaped piston 63, and the straight pipe portion 50a Residual concrete is pushed out into the concrete placement space E.

  As shown in FIG. 1, the rod-shaped piston 63 includes a center rod 64 screwed to the tip of the piston rod of the jack 62, and a bolt 66 and a holding plate 66a via a first collar 65 at the tip of the center rod 64. A combined first packing 67, a first pipe (spacer) 68, a second collar 69, a second packing 70, a second pipe (spacer) 71 sequentially fitted on the central rod 64 from the front end side; In order to prevent the fitting members from coming off, a nut 72 screwed to the proximal end portion of the center rod 64 is provided.

  As shown in FIG. 5, when the jack 62 is extended, the branch pipe portion 50 b of the concrete placing pipe 50 is closed in a sealed state by the second packing 70 by the advance of the rod-shaped piston 63, and the first packing 67 The concrete placement space E is sealed.

  The first packing (packing in the claims) 67 is configured such that the back side of a ring-shaped main body 67a made of rubber such as urethane rubber is fitted on the back surface 67a1 and a part of the outer peripheral surface 67a2 continuous to the back surface. It is reinforced by a bonded ring-shaped thin plate cover 67b.

  Specifically, the thin plate cover 67b is made of a metal such as stainless steel (SUS304) in which a peripheral wall 67b2 is raised from a bottom wall 67b1 with a central through hole 67b3, and the bottom wall 67b1 is attached to the back surface 67a1 of the ring-shaped main body 67a. The peripheral wall 67b2 is bonded to a part of the outer peripheral surface 67a2 of the ring-shaped main body 67a. These adhesions may be performed by an adhesive, or may be integrally formed by vulcanization using a mold or the like.

  In FIG. 4, 73 is a cleaning water discharge elbow that is paired with a cleaning water supply elbow (not shown) for cleaning the inside of the connecting pipe 61, and 74 is a pressure gauge for detecting the pressure in the concrete placing pipe 51. Reference numeral 75 denotes a support for supporting the concrete placing pipe 51.

  Next, tunnel excavation work by the mud pressure shield excavator of the above-described embodiment will be described.

  As shown in FIG. 2, while rotating the cutter head 18 by the cutter turning motor 25, the plurality of shield jacks 35 are extended to press the spreader 36 against the existing inner form S, and the reaction force causes the excavator body 11 to move. Move forward. Then, each cutter bit 22 of the cutter head 18 excavates the front ground, and excavated earth and sand are taken into the chamber 28 from between the respective cut porks 19 and are carried out by the screw conveyor 33 to the outside.

  In the inner formwork assembly apparatus 39, the inner formwork S carried into the tunnel is grasped and moved along the inner wall surface of the tunnel, and the grasped inner formwork S is fixed at a predetermined position in a ring shape. Assemble. At this time, the front shape holding device 42 corrects the inner mold frame S to a normal assembly position while avoiding interference with the inner mold frame assembling device 39, and the rear shape holding device 42 is assembled in a ring shape. The inner mold S is corrected to be a perfect circle.

  In parallel with the assembly of the inner formwork S by the inner formwork assembling apparatus 39, the concrete placement apparatus E creates a concrete placement space E between the peripheral wall of the excavated ground G and the outer peripheral surface of the existing inner formwork S. Ready-mixed concrete is cast.

  That is, the jack 62 of the closing valve device 60 is reduced, and the straight pipe portion 50a and the branch pipe portion 50b of the concrete placing pipe 50 communicate with each other by the retreat of the rod-like piston 63 (the state shown in FIGS. 3 and 4). Reference), the ready-mixed concrete fed to the concrete placement pipe 51 is supplied to the concrete placement space E through the branch pipe portion 50b and the straight pipe portion 50a.

  At this time, by operating the end form jack 47 to the extension side, the end form mold 46 is pressed against the placed concrete, and the concrete is filled to every corner of the concrete placement space E. . Thereafter, when a predetermined time elapses, the concrete is cured and hardened, and the tunnel structure is firmly constructed.

  Further, when the excavator body 11 is propelled, the inner mold S is assembled and assembled. That is, when a predetermined time elapses after the ready-mixed concrete is continuously poured into the concrete placing space E, the concrete is gradually cured and hardened. Therefore, the inner mold S on the rear stage corresponding to the cured and hardened concrete is removed (demolded) by an inner mold demolding device (not shown), and transported to the front of the tunnel by a hoist (not shown) to assemble the inner mold. It is used for new assembly by the device 39.

  On the other hand, when the mud pressure shield excavator is stopped by inspection or the like, the placement of ready-mixed concrete into the concrete placement space E by the concrete placement device is stopped. At this time, the jack 62 of the closing valve device 60 is extended, and the communication between the straight pipe portion 50a and the branch pipe portion 50b of the concrete placing pipe 50 is blocked by the second packing 70 portion by the advance of the rod-like piston 63. At the same time, the residual concrete in the straight pipe portion 50a is pushed out into the concrete placement space E by the first packing 67 portion (see the state of FIG. 5).

  Thereafter, the concrete placement lines are washed before the ready-mixed concrete in the concrete placement pipe 51 and the branch pipe portion 50b of the concrete placement pipe 50 is not hardened. That is, the concrete placement pipe 51 is separated from the concrete placement pipe 50 and washed with high-pressure washing water as before, while the branch pipe portion 50b of the concrete placement pipe 50 places the concrete placement pipe 50 into the wife formwork 46. It is washed with high-pressure washing water in the attached state.

  In this embodiment, the ready-mixed concrete leaked from the second packing 70 into the connecting pipe 61 is washed with high-pressure washing water using a washing water discharge elbow 73 that is paired with a washing water supply elbow (not shown). You can also.

  In this way, in this embodiment, when the mud pressure shield excavator is stopped, the branch pipe portion 50b of the concrete placing pipe 50 that leads to the supply source of the ready concrete through the concrete placing pipe 51 is the first piston 63. While being closed by the two packing 70 parts, the residual concrete in the straight pipe part 50a of the concrete placing pipe 50 leading to the concrete placing space E is pushed out to the concrete placing space E by the first packing 67 part.

  Thus, when cleaning the mud pressure shield excavator after stopping, there is no residual concrete in the closing valve device 60 and the straight pipe portion 50a of the concrete placing pipe 50. There is no work of removing and cleaning the ready-mixed concrete in the space E after it is hardened. In other words, re-digging can be started as it is. Moreover, since the branch pipe part 50b of the concrete placing pipe 50 is also a short pipe, it can be easily cleaned as it is even if it cannot be removed.

  As a result, the concrete placement line can be easily cleaned and the cleaning time can be shortened, and the number of parts removed at the time of cleaning can be reduced, so that the re-digging can be set up in a short time. In addition, even during excavation by a mud pressure shield excavator, when waiting for placing in the state shown in FIG. 3 and FIG. The dead concrete adhered and deposited in the straight pipe portion 50a of the concrete placing pipe 50 can be pushed out into the concrete placing space E and removed.

  In the present embodiment, in the rod-like piston 63 in the closing valve device 60, the first packing 67 passing through the branch portion of the branch pipe portion 50b with respect to the straight pipe portion 50a of the concrete placing pipe 50 is a rubber ring shape. The main body 67a is reinforced with a metal ring-shaped thin plate cover 67b.

  As a result, when the first packing 67 passes through the Y-shaped branch portion, the first packing 67 bites the concrete aggregate or the like because the tip of the rod-shaped piston 63 is offset toward the branch portion side. In addition, the back surface of the ring-shaped main body 67a is prevented from being damaged such as being scratched or scraped.

  As a result, the life of the first packing 67 in the rod-shaped piston 63 is extended, and a delay in construction period and an increase in cost are avoided in advance.

  In this way, the concrete placement device capable of enhancing the durability of the closing valve device 60 is provided, so that the excavation efficiency of the mud pressure shield excavator can be increased.

  The tunnel excavator according to the present invention can be applied not only to a mud pressure shield excavator but also to a mud shield excavator, a mechanical shield excavator, a tunnel boring machine (TBM), and the like.

DESCRIPTION OF SYMBOLS 11 Excavator main body 12 Front trunk 13 Rear trunk 14 Connecting shaft 15 Half-fold jack 16 Rotating ring 17 Connecting beam 18 Cutter head 19 Cutter pork 20 Outer ring 21 Fish tail cutter 22 Cutter bit 23a Copy cutter 23b Rescue bit 24 Ring gear 25 Cutter Rotating motor 26 Drive gear 27 Bulk head 28 Chamber 29 Fixed stirring rod 30 Rotating stirring rod 33 Screw conveyor 34 Ring gutter 35 Shield jack 36 Spreader 38 Rotating ring 39 Inner formwork assembly device 40 Support column 41 Mounting base 42 Shape holding device 46 Wife Formwork 47 Wife formwork jack 48 Seal member 49 Brush seal 50 Concrete placement pipe 50a Straight pipe section 50b Branch pipe section 51 Concrete placement pipe 60 Blocking valve device 61 Connecting pipe 6 Jack 63 the rod-shaped piston 64 around rod 65 first collar 66 volt 66a retainer plate 67 first packing 67a rubber ring shaped body portion 67a1 rear 67a2 outer peripheral surface 67b annular thin cover of urethane rubber or the like for opening and closing-cleaning.
67b1 bottom wall 67b2 peripheral wall 67b3 central through hole 68 first pipe (spacer)
69 Second collar 70 Second packing 71 Second pipe (spacer)
72 Nut 73 Elbow for draining washing water 74 Pressure gauge 75 Support

Claims (3)

A blocking valve device used for direct-concrete concrete construction,
A jack attached to the base end side of the straight pipe portion branched from the branch pipe portion in a Y shape;
A rod-like piston attached to the tip of the piston rod of the jack and slidable in the straight pipe portion so as to pass through the branch portion;
With
A blocking valve device characterized in that the back side of the packing attached to the tip of the rod-like piston is reinforced with a metal cover.   The said packing is reinforced by the ring-shaped thin plate cover which adhere | attached the back side of the ring-shaped main-body part made from rubber | gum on the back surface and a part of outer peripheral surface continuous to this back surface. The blocking valve device described in 1. A tubular excavator body, a propulsion jack for advancing the excavator body, a cutter head supported rotatably at the front portion of the excavator body, and a driving means for rotating the cutter head are excavated. In a tunnel excavator equipped with a concrete placing device used when lining the tunnel inner wall behind the excavator body,
A tunnel excavating machine, wherein the concrete placing device includes the closing valve device according to claim 1.

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