JP3735226B2 - 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-described lining method, the end form frame seal is fitted on the outer peripheral surface of the end form frame so as to be in sliding contact with the inner peripheral surface of the skin plate of the excavator body so as to stop (seal) the portion concerned. Is done.
[0005]
Conventionally, a ring-shaped rubber seal has been used for this end form frame seal, assembled in a reduced diameter state (free state), and then vertically deformed (expanded) by tightening with a bolt to obtain a predetermined sealing function. It was.
[0006]
As a result, the work of tightening with bolts is troublesome, and there is a problem that the sliding friction between the rubber and the iron skin plate is large, and the smooth operation of the wife formwork is impaired. In addition, there is a problem in that the sealing performance is deteriorated because it is not possible to sufficiently follow the change in the circumference due to the manufacturing error of the skin plate and the deformation of the skin plate during the excavation.
[0007]
The present invention has been proposed in view of the above-described circumstances, and an object of the present invention is to provide a wife formwork apparatus for a tunnel excavator that can improve the assembling property and sealability of the outer periphery seal in the wife formwork.
[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 a concrete-shaped wife formwork and directly casts concrete into the space through the wife formwork, a ring-shaped groove is formed on the outer peripheral surface of the wife formwork, An outer peripheral seal is fitted to the ring-shaped groove so as to be movable in the groove depth direction, and fluid urging means for constantly pushing up and urging the outer peripheral seal outward is disposed at the groove bottom , and the outer peripheral seal is A thin rubber packing is interposed between hard synthetic resin materials divided into a plurality in the circumferential direction .
[0009]
In addition, the synthetic resin material is divided into a plurality of trapezoidal shapes, and is alternately arranged in the circumferential direction so that the taper surfaces thereof are matched.
[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]
1 is a cross-sectional view of a main part of a wife formwork apparatus, FIG. 2 is a plan view of the wife formwork apparatus, and FIG. 3 is a side cross section of a muddy water type shield excavator that also adopts ECL. FIG. 4 is an overall layout view of the wife formwork apparatus as seen from the cutting edge side, FIG. 5 is an overall view of the wife formwork apparatus as seen from the tail side, and FIG. 6 is an overall view of the wife formwork apparatus as well. It is sectional drawing.
[0012]
As shown in FIG. 3, 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 predetermined intervals in the circumferential direction, and a plurality of wife form jacks 17 (in FIG. 4, 24 symmetrically arranged). As shown in FIGS. 4 and 5, the tip ends of the piston rods of the end form jacks 17 are pin-coupled to a later end form form 18 disposed in the space between the inner form frame 19 and the skin plate 1a.
[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. In FIG. 3, 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. 6, 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. An outer peripheral seal 25 is fitted into the inner peripheral surface so as to be in sliding (bullet) contact with the inner peripheral surface for water-stopping (sealing) 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. 4) lifts the tip half of the stainless-steel packing 26 when necessary. .
[0019]
Further, a concrete placement port 29 (see 16 places arranged at equal intervals in FIGS. 4 and 5) is drilled through the inside of the end form 18 and the hardened concrete is joined. 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. 5) and dead concrete adhering to the front end surface of the end frame 18 are extruded. A dead concrete extruding device 33 (see 16 peeling concrete extruding jacks 34 arranged symmetrically in FIG. 5) is incorporated.
[0020]
As shown in FIGS. 1 and 2, the outer peripheral seal 25 is a ring-shaped groove formed (defined) by the flange portion 18 a of the wife mold 18 and the contact plate 35 on the outer periphery of the wife mold 18. 36 is movably fitted in the groove depth direction. A fluid urging means 37 is provided at the bottom of the ring-shaped groove 36 to constantly push up and urge the outer peripheral seal 25 outward.
[0021]
The outer peripheral seal 25 is formed by interposing a thin rubber packing 25b between hard nylon resin materials 25a divided into a plurality (for example, 24) in the circumferential direction. The synthetic resin materials 25a are each formed in a trapezoidal shape, and are alternately arranged in the circumferential direction so that the taper surfaces thereof coincide with each other.
[0022]
The fluid urging means 37 includes a sealed rubber packing 37a that can be expanded and contracted by supplying and discharging air (or oil), an inside (inside) of the rubber packing 37a, and an air supply source such as an air compressor (not shown). And an air passage 37b drilled in the interior of the wife form 18 to connect the two.
[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]
Incidentally, prior to the excavation, when the wife mold 18 is inserted and assembled in the space between the skin plate 1a and the inner mold 19, air is not supplied into the rubber packing 37a.
[0026]
Thereby, the rubber packing 37a is in a contracted state, and the outer peripheral seal 25 is easily assembled in a state where the rubber packing 25b is narrowed and deeply fitted into the ring-shaped groove 36.
[0027]
As a result, the end form frame 18 can ensure a predetermined clearance between its outer peripheral surface and the inner peripheral surface of the skin plate 1a, and can be inserted and assembled quickly and smoothly into the space.
[0028]
On the other hand, after the end form 18 is inserted and assembled, air is supplied into the rubber packing 37a from an air supply source (not shown) via an air passage 37b.
[0029]
As a result, the rubber packing 37a expands and swells, and always pushes up and urges the entire outer peripheral seal 25 outward, and elastically contacts the outer peripheral surface of the outer peripheral seal 25 to the inner peripheral surface of the skin plate 1a.
[0030]
As a result, a sufficient sealing function is obtained, and the friction between the hard nylon resin material 25a and the skin plate 1a is small, so that the smooth operation of the end form 18 can be expected. At this time, since the hard nylon resin material 25a is not stretchable, it cannot be expected to continuously contact the inner peripheral surface of the skin plate 1a over the entire circumference. Since 25b swells in the circumferential direction as the gap between the nylon resin materials 25a increases, the sealing performance is sufficiently maintained. In other words, it is possible to sufficiently follow the change in the circumferential length of the skin plate 1a.
[0031]
Moreover, since the hard nylon resin material 25a is divided into a plurality of parts, it can easily follow partial deformation of the skin plate 1a during digging. Furthermore, each nylon resin material 25a is divided and formed in a trapezoidal shape, and is alternately arranged in the circumferential direction so that the taper surfaces of the nylon resin materials 25a match each other. Replacement work can be easily performed from the inside of the machine.
[0032]
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. . Other than that, the ring-shaped outer peripheral seal whose material is not specified is simply pushed up and biased by the fluid biasing means, or the nylon resin material 25a is straightly divided and formed without departing from the gist of the present invention. It goes without saying that changes are possible.
[0033]
【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, a ring is formed on the outer peripheral surface of the wife mold An annular seal is formed, and an outer periphery seal is fitted to the ring groove so as to be movable in the depth direction of the groove, and a fluid urging means for constantly pushing up and urging the outer periphery seal is disposed at the bottom of the groove. In addition, since the outer peripheral seal is formed by interposing a thin rubber packing between hard synthetic resin materials divided into a plurality of parts in the circumferential direction, the assembly of the outer peripheral seal is improved and the outer peripheral seal The sealing performance can be improved by improving the followability. Further, the outer peripheral seal is formed by interposing a thin rubber packing between hard synthetic resin materials divided into a plurality of parts in the circumferential direction, so that the friction between the hard synthetic resin material and the skin plate is reduced. Smooth operation of the mold can be expected, and it is possible to sufficiently follow changes in the circumferential length of the skin plate etc. by interposing the elastic rubber packing, and further, since the nylon resin material is divided into multiple parts, It is also possible to easily follow partial deformation of a skin plate or the like during excavation.
[0034]
According to a second aspect of the present invention, the synthetic resin material is divided into a plurality of trapezoidal shapes, and is alternately arranged in the circumferential direction so that the taper surfaces thereof coincide with each other. Therefore, the partial replacement work can be easily performed from the inside of the machine as compared with the case where it is divided and formed straight.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a wife formwork apparatus showing an embodiment of the present invention.
FIG. 2 is a plan view of the wife formwork apparatus.
FIG. 3 is a side cross-sectional view of a muddy shield excavator that also employs ECL.
FIG. 4 is an overall layout view of the wife formwork apparatus as seen from the cutting edge side.
FIG. 5 is an overall layout view of the wife formwork apparatus as seen from the tail side.
FIG. 6 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 frame 20 Support member 21 Electa 22 Shape holding member 23 Feeder device 24 Demolding device 25 Peripheral seal 25a Synthetic resin material 25b Rubber packing 26 Stainless packing 27 Stainless packing lifting device 28 Stainless steel packing push-up jack 29 Concrete placement port 30 Water expansion seal 31 Water expansion seal extrusion equipment 32 Water expansion seal extrusion jack 33 Dead concrete extrusion equipment 34 Dead concrete extrusion jack 35 caul plate 36 ring-shaped groove 37 fluid biasing means 37a rubber packing 37b air passage 40 concrete 設用 pipe

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, a ring-shaped groove is formed on the outer peripheral surface of the end form frame, and an outer peripheral seal is fitted to the ring-shaped groove so as to be movable in the groove depth direction. In addition, a fluid urging means for constantly pushing up and urging the outer peripheral seal outward is disposed at the bottom of the groove , and the outer peripheral seal has a thin plate shape between a plurality of hard synthetic resin materials divided in the circumferential direction. A wife formwork device for a tunnel excavator, characterized by comprising rubber packing . The synthetic resin material, a plurality of divided trapezoidal, Wife mold apparatus tunneling machine according to claim 1, wherein the tapered surface of each other are staggered in the circumferential direction to match.

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