JP3706514B2 - Wife formwork device for tunnel excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wife formwork apparatus for a tunnel excavator, and more particularly to a wife formwork apparatus for a tunnel excavator that employs a lining method using ECL (Excluded Concrete Lining).
[0002]
[Prior art]
As a tunnel excavator employing the lining method, a muddy shield excavator is well known. This is to excavate the ground with a cutter head provided in the front part of the outer cylindrical shield excavator body, while covering the peripheral wall of the tunnel tunneled with an inner mold frame at a predetermined interval. Concrete is placed by direct striking (place-in-place), for example, by placing a reinforcing bar between the peripheral wall, and lining is performed after curing and hardening.
[0003]
In the muddy water type shield excavator as described above, a ring-shaped wife mold (device) for closing the space between the peripheral wall of the tunnel and the inner mold is provided, and the concrete is passed through the wife mold. In addition to being cast, it is slidable in the space in the front-rear direction (longitudinal direction of the tunnel) by expansion and contraction of the end form jack.
[0004]
[Problems to be solved by the invention]
By the way, in the above-mentioned lining method, there is a problem that the joint of the concrete is inevitably generated with the tunnel excavation, and if it is left as it is, the expansion and contraction crack is generated in the part and the water leakage is generated in the mine. . Thus, conventionally, secondary lining has been performed by providing a water drainage spot on the inner surface of the concrete and spraying the fiber or finishing the required inner surface.
[0005]
In order to avoid the cost increase due to the secondary lining or the like as a countermeasure, the present inventors recently used a water expansion seal (expanded when moisture is included) at the joint of concrete. Proposed technology to wear. According to this, before the next new concrete is placed on the concrete end surface that has already been placed and hardened, it is necessary to apply a water expansion seal in advance. Retraction (retraction) and insertion (advancement) are repeated several times.
[0006]
However, the end form frame is equipped with a stainless packing that slides (bulbs) into contact with the outer peripheral surface of the inner form frame to stop water (seal) the part, and the tip half of the stainless packing is tapered. Since the tip edge of the stainless steel packing is in contact with the outer peripheral surface of the inner mold frame, the front edge of the stainless steel packing does not interfere with the outer peripheral surface of the inner mold frame without any trouble. Although it is in sliding contact, the forward edge of the stainless steel packing is deformed / damaged by being replaced with the outer peripheral surface of the inner mold frame, and the sealing function is impaired. That is, conventionally, the shape and the like of the stainless steel packing are determined on the basis of only the pulling (retracting) operation of the wife formwork.
[0007]
The present invention has been proposed in view of the above-described circumstances, and provides a tunnel formwork apparatus for a tunnel excavator that can effectively prevent deformation and breakage of a plate-like packing during insertion (advancement) of the end formwork. The purpose is to do.
[0008]
[Means for Solving the Problems]
In order to achieve such an object, a tunnel form machine for a tunnel excavator according to the present invention covers an outer wall of a tunnel that has been dug with an inner form frame at a predetermined interval, and the space between the inner form frame and the peripheral wall is a ring. In a tunnel excavator that is closed with concrete shaped wife formwork and directly casts concrete into the space through this formwork frame, the end edge protrudes from the inside of the wife formwork and protrudes toward the rear of the tunnel. In addition to providing a plate-like packing that is in sliding contact with the outer peripheral surface of the mold frame, a packing push-up device that pushes up the plate-like packing and separates the leading edge from the outer peripheral surface of the inner mold frame during the insertion operation of the mater mold frame is provided. It is characterized by that.
[0009]
Further, the packing push-up device is divided into a plurality of portions in the circumferential direction on the inner peripheral surface of the end form, and is disposed so as to be movable in the longitudinal direction of the tunnel. It has a push-up jack combined with it.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a tunnel form machine for a tunnel excavator according to the present invention will be described in detail with reference to the drawings by way of examples.
[0011]
[Example]
[Constitution]
FIG. 1 is a cross-sectional view of a stainless steel packing push-up device portion showing an embodiment of the present invention, FIG. 2 is a plan view of the main part of the stainless steel packing, FIGS. 3 (a) and 3 (b) are operational state diagrams, and FIG. Fig. 5 is a side sectional view of a mud shield excavator that also employs ECL, Fig. 5 is an overall layout view of the wife formwork device as seen from the cutting edge side, and Fig. 6 is an overall view of the wife formwork device as seen from the tail side. FIG. 7 is an overall sectional side view of the wife formwork apparatus.
[0012]
As shown in FIG. 4, a cutter head 3 is rotatably mounted on a partition wall (bulk head) 2 on the front side of the cylindrical skin plate 1a of the excavator body 1 by an intermediate support system. A number of cutter bits (not shown) are mounted on the front surface of the cutter head 3, and an appropriate number of copy cutters 4 are mounted on the outer periphery of the cutter head 3 via a jack 5 so as to be extendable and retractable. A ring gear 6 is fixed to the rear part of the cutter head 3.
[0013]
A cutter turning motor 7 as a cutter head driving means is attached to the partition wall 2, and a drive gear 8 of the cutter turning motor 7 is engaged with the ring gear 6. Accordingly, when the cutter turning motor 7 is operated to drive the drive gear 8 to rotate, the cutter head 3 is rotated via the ring gear 6.
[0014]
An appropriate number of agitators 11 are provided in the chamber chamber 10 defined by the cutter head 3 and the partition wall 2 and can be rotated by an electric motor 12. Further, the chamber chamber 10 has an outlet portion and an inlet portion of a mud pipe 13 and a mud pipe 14 connected to and connected to a feeding / discharging device behind the tunnel, respectively.
[0015]
In the ring-shaped reinforcing portion 15 on the rear side of the skin plate 1a, a large number of shield jacks 16 are arranged at a predetermined interval in the circumferential direction, and a plurality of wife form jacks 17 (in FIG. 5, 24 are arranged symmetrically). As shown in FIGS. 5 and 6, the tip end of the piston rod of the wife form frame jack 17 is pin-coupled to a later-described wife form frame 18 disposed in the space between the inner form frame 19 and the skin plate 1 a.
[0016]
Further, a support member 20 is assembled to the ring-shaped reinforcing portion 15, and a shape holding for holding the perfect circle (shape) of the assembled inner mold frame 19 with the erector 21 that assembles the inner mold frame 19 on the support member 20. A device 22 is provided. 4, 23 is a feeder device for the inner mold 19, 24 is a demolding device, and 40 is a pipe for placing concrete.
[0017]
As shown in FIG. 7, the end form frame 18 is a ring-shaped member for closing the space between the skin plate 1a (the peripheral wall of the tunnel) and the inner form frame 19, and the outer peripheral surface has a skin plate 1a. A mating mold seal 25 is fitted so as to be in sliding contact with the inner peripheral surface of the frame and to stop water (seal) of the part.
[0018]
Further, a stainless steel packing 26 is mounted on the inner peripheral surface of the end form 18 as a plate-like packing that slides (bulbs) into contact with the outer peripheral surface of the inner form 19 and seals the portion concerned. A stainless-steel packing push-up device 27 (see 12 stainless-steel packing push-up jacks 28 arranged symmetrically in FIG. 5) pushes up the front half of the stainless-steel packing 26 when necessary. .
[0019]
Further, a concrete placement port 29 (see 16 places arranged at equal intervals in FIG. 5 and FIG. 6) is drilled through the interior of the end form 18 and the hardened concrete is joined. A water expansion seal extrusion device 31 for extruding the water expansion seal 30 to the surface (see 12 water expansion seal extrusion jacks 32 arranged symmetrically in FIG. 6) and dead concrete adhering to the front end surface of the end form 18 are extruded. A dead concrete extruding device 33 (see 16 peeling concrete extruding jacks 34 arranged symmetrically in FIG. 6) is incorporated therein.
[0020]
As shown in FIGS. 1 and 2, the stainless packing push-up device 27 is divided into a plurality of parts in the circumferential direction by matching the number of the stainless packings 26 on the inner peripheral surface of the end form 18 (example shown in the figure). Are divided into 12) and are respectively connected to pins (or bolts) 36 movably in the front-rear direction of the excavator (left and right in the figure) through the long holes 35, and behind these push-up plates 37. A stainless packing push-up jack 28 whose piston rod tip is pin-coupled to each end via a single bracket 38, and these stainless packing push-up jacks 28 (the head portion thereof) are fixed to the rear end surface of the end frame 18 It comprises a support bracket 39 that supports it.
[0021]
All the stainless steel packing push-up jacks 28 are expanded and contracted simultaneously in synchronism with the pull-in (retreat) and insertion (advance) operations of the end form frame 18 via a hydraulic control device (not shown). When the packing push-up jack 28 is extended, the twelve push-up plates 37 are moved all at once to the rear of the excavator (to the right in the figure), and the leading end thereof comes into contact with the leading half of the stainless packing 26. This is pushed up to separate (float) from the outer peripheral surface of the inner mold 19 (see the chain line in FIG. 1).
[0022]
In the stainless steel packing 26, strip-shaped plate materials divided into a plurality of parts in the circumferential direction are laminated over a plurality of layers (for example, three layers) by shifting the dividing line, and the tapered side is tapered at the tip side. It is formed.
[0023]
[Action / Effect]
Because of this construction, the cutter turning motor 7 is operated to rotate the cutter head 3 and the shield jack 16 is extended while the mud pipe 13 is sent into the chamber chamber 10 from the mud pipe 13 to propel the excavator body 1 ( When advancing), a number of cutter bits (and copy cutters 4) mounted on the cutter head 3 excavate the front ground. The excavated earth and sand are discharged from the chamber chamber 10 to the outside through the mud pipe 14.
[0024]
At this time, the propulsion reaction force of the excavator body 1 is borne by the frictional force between the inner mold frame 19 with which the tip of the piston rod of the shield jack 16 abuts and the concrete C which has been placed and cured and hardened. Further, along with this excavation, the inner mold 19 is assembled to the foremost position with the piece at the last position being hit in order by the demolding device 24 and the feeder device 23.
[0025]
Further, with the excavation, the concrete C is handed over to the space between the skin plate 1 a and the inner mold 19. At this time, as shown in FIG. 3, in order to interpose the water expansion seal 30 (see FIG. 7) at the joint, the wife form frame 18 is retracted (retracted) and inserted (retracted) and inserted (retracted). (Forward) is repeated several times.
[0026]
When the wife form frame 18 is retracted (retracted), as shown in FIG. 3A, the push-up plate 37 is in the retracted position due to the contraction of the stainless packing push-up jack 28, and its tip portion Does not come into contact with the front half of the stainless steel packing 26. That is, the front end edge of the stainless steel packing 26 is in sliding contact with the outer peripheral surface of the inner mold 19 so that the wife mold 18 can be retracted as before.
[0027]
On the other hand, when the end frame 18 is inserted (advanced), as shown in FIG. 3 (b), the push-up plate 37 is in the advanced position due to the extension of the stainless steel packing push-up jack 28, and its tip portion Comes into contact with the tip half of the stainless packing 26 and pushes it up slightly. That is, the front end edge of the stainless steel packing 26 is pulled away from the outer peripheral surface of the inner mold frame 19, and the front end edge of the stainless steel packing 26 is replaced with the outer peripheral surface of the inner mold frame 19 when the wife mold 18 is inserted. This prevents deformation and breakage and prevents the sealing function from being impaired.
[0028]
As described above, in the wife formwork apparatus of the present embodiment, deformation and breakage of the stainless steel packing 26 during insertion (advancement) of the wife formwork is effectively prevented by the stainless steel packing push-up device 27 having a simple structure. Therefore, it is most suitable for a muddy water type shield excavator that employs ECL and has a water expansion seal 30 interposed between joints of concrete C.
[0029]
In this embodiment, the tunnel excavator of the present invention has been described as a muddy water type shield excavator. However, the tunnel excavator may be applied to an earth pressure type shield excavator, and may also be applied to a tunnel boring machine for excavating rock. . In addition, it goes without saying that various modifications can be made without departing from the scope of the present invention.
[0030]
【The invention's effect】
As described above in detail, the wife formwork apparatus of the tunnel excavator according to claim 1 of the present invention covers the peripheral wall of the tunnel excavated with the inner formwork at a predetermined interval, In a tunnel excavator in which the space with the peripheral wall is closed with a ring-shaped wife mold, and concrete is placed directly into the space through the wife mold, Provides a plate-like packing that protrudes rearward of the tunnel and slidably contacts the outer peripheral surface of the inner mold frame, and pushes up the plate-shaped packing during the insertion operation of the same mold to separate the tip edge from the outer peripheral surface of the inner mold frame. Since the packing push-up device is provided, deformation and breakage of the plate-shaped packing during insertion (advance) of the end form can be effectively prevented by the packing push-up device, adopting ECL and concrete joints Water expansion The ideal tunneling machine which is adapted to interposed Lumpur.
[0031]
According to claim 2 of the present invention, in the tunnel form machine of the tunnel excavator, the packing push-up device is divided into a plurality of parts in the circumferential direction on the inner peripheral surface of the wife form frame so as to be freely movable in the longitudinal direction of the tunnel. Since the push-up plate provided and the push-up jacks respectively connected to the push-up plates are provided, the same operation and effect as in the first aspect can be obtained by the packing push-up device having a simple structure.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a stainless steel packing push-up device portion showing an embodiment of the present invention.
FIG. 2 is a plan view of an essential part of the stainless steel packing.
FIG. 3 is an operational state diagram.
FIG. 4 is a side sectional view of a muddy water type shield excavator similarly adopting ECL.
FIG. 5 is an overall layout view of the wife formwork apparatus as seen from the cutting edge side.
FIG. 6 is an overall layout view of the wife formwork apparatus as seen from the tail side.
FIG. 7 is an overall side cross-sectional view of the wife formwork apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Excavator main body 1a Skin plate 2 Bulkhead 3 Cutter head 4 Copy cutter 5 Jack 6 Ring gear 7 Cutter turning motor 8 Drive gear 10 Chamber chamber 11 Agitator 12 Electric motor 13 Mud pipe 14 Drain pipe 15 Ring-shaped reinforcement part 16 Shield Jack 17 Wife mold jack 18 Wife mold 19 Inner mold 20 Support member 21 Electa 22 Shape retaining member 23 Feeder device 24 Demolding device 25 Wife mold seal 26 Stainless packing 27 Stainless packing lifting device 28 Stainless packing lifting jack 29 Concrete Placing Port 30 Water Expansion Seal 31 Water Expansion Seal Extrusion Device 32 Water Expansion Seal Extrusion Jack 33 Dead Concrete Extrusion Device 34 Dead Concrete Extrusion Jack 35 Long Hole 36 Pin 37 Push-up Plate 38 Bracket 39 Lifting bracket 40 concrete 設用 piping

Claims (2)

The inner wall of the tunnel that has been dug is covered with an inner mold frame at a predetermined interval, the space between the inner mold frame and the peripheral wall is closed with a ring-shaped wife mold frame, and directly into the space through the wife mold frame. In the tunnel excavator configured to cast concrete, the end form is provided with a plate-like packing whose tip edge protrudes rearward of the tunnel and is in sliding contact with the outer peripheral surface of the inner form. A tunnel formwork apparatus for a tunnel excavator, characterized in that a packing pushup device is provided for pushing up the plate-like packing to separate the tip edge from the outer peripheral surface of the inner formwork during the insertion operation. The packing push-up device is coupled to a push-up plate that is divided into a plurality of portions in the circumferential direction on the inner peripheral surface of the end form frame and is movably disposed in the longitudinal direction of the tunnel. 2. The wife formwork apparatus for a tunnel excavator according to claim 1, further comprising a lifting jack.

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