JP2001173390A - Gable formwork device for tunnel excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gable formwork device for a tunnel excavator capable of effectively preventing the deformation and breakage of plate-shaped packing in the insertion (move forward) of the gable formwork. SOLUTION: Peripheral wall of a driven tunnel is covered with an inner formwork 19 at predetermined intervals, and a space between this inner formwork 19 and the peripheral wall is closed by a ring-shaped gable frame 18, a stainless steel packing 26 slidably in contact with the outer peripheral surface of the inner formwork 19 projecting out to the rear of the tunnel at the tip edge portion is installed to the gable formwork 18 at the tunnel excavator for placing concrete directly in the space stated above through the gable formwork 18, and the stainless steel packing 26 is pushed up by the push-up plate 37 during the insert operation of the gable formwork 18, and a stainless steel packing push-up device 27 separating the tip edge portion from the outer peripheral surface of the inner formwork 19 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wife formwork apparatus for a tunnel excavator, and more particularly to an ECL (Excluded Concrete).
Lining) and a wife formwork apparatus for a tunnel excavator employing a lining method.

[0002]

2. Description of the Related Art A muddy shield excavator is well known as a tunnel excavator employing the above lining method. This is, while excavating the ground with a cutter head provided on the front part of the shielded excavator body having an outer cylindrical shape, covering the peripheral wall of the excavated tunnel with an inner form at a predetermined interval, and forming the inner form with the inner form. By arranging a reinforcing bar between the peripheral wall and the like,
Concrete is cast directly (cast in place) and lining is performed after curing and hardening.

In the above-mentioned muddy shield excavator, a ring-shaped formwork (device) for closing the space between the peripheral wall of the tunnel and the inner formwork is provided. The concrete is cast, and the inside and outside of the space can be slid in the front-rear direction (the longitudinal direction of the tunnel) by the expansion and contraction of the end form jack.

[0004]

However, in the above-mentioned lining method, inevitably,
There is a problem that a seam of concrete is generated and expansion cracks are generated in the portion as it is and water leaks in the pit. Therefore, in the related art, a secondary lining has been performed by providing a drainage portion on the inner surface of the concrete and spraying the fiber, or finishing the required inner surface.

As a countermeasure, the present inventors have recently developed a water-expandable seal (expanded when containing water to provide a sealing effect) at the joint of concrete in order to avoid an increase in cost due to the secondary lining or the like in recent years. ) Interposed technology was proposed. According to this, it is necessary to attach a water expansion seal in advance before placing the next new concrete on the already cast and hardened concrete end face. Pull in (retreat),
The insertion (advance) will be repeated several times.

However, the end mold is provided with a stainless steel packing which slides (elastically) in contact with the outer peripheral surface of the inner mold to seal (seal) the portion. Since the portion is formed in a tapered cylindrical shape and its leading edge contacts the outer peripheral surface of the inner mold, when the wife mold retreats, the leading edge of the stainless steel packing does not hinder the inner mold without any trouble. Although it comes into sliding contact with the outer peripheral surface, there is a problem in that, when the stainless steel packing advances, the front end edge of the stainless steel packing is stuck to the outer peripheral surface of the inner mold frame and is deformed or damaged, thereby impairing the sealing function. That is, conventionally, the shape and the like of the stainless steel packing are determined by assuming only the retracting (retracting) operation of the wife formwork.

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned circumstances, and a wand form of a tunnel excavator capable of effectively preventing deformation and breakage of a plate-like packing during insertion (advance) of a wand form. It is intended to provide a device.

[0008]

According to the present invention, there is provided a wand form apparatus for a tunnel excavator which achieves the above object, covers a peripheral wall of a dug tunnel by a predetermined distance from an inner form,
In a tunnel excavator in which the space between the inner form and the peripheral wall is closed with a ring-shaped formwork, and concrete is directly poured into the space through the formwork,
A plate-like packing whose leading edge protrudes rearward of the tunnel and is in sliding contact with the outer peripheral surface of the inner form is provided on the wand formwork, and the plate-like packing is pushed up during the insertion operation of the wive form so that the leading-end edge is formed. Is provided with a packing pushing-up device that separates the packing from the outer peripheral surface of the inner mold.

The packing push-up device includes a push-up plate which is divided into a plurality of pieces in the circumferential direction on the inner peripheral surface of the end form and is movably disposed in the longitudinal direction of the tunnel. And a push-up jack which is connected to each one.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a wand formwork apparatus for a tunnel excavator according to the present invention.

[Embodiment] [Structure] FIG. 1 is a cross-sectional view of a stainless-steel packing lifting device, showing one embodiment of the present invention, FIG. 2 is a plan view of a main part of the stainless-steel packing, and FIGS. b) is an operation state diagram, FIG. 4 is a side sectional view of a muddy shield excavator also employing ECL, FIG. 5 is an overall layout view of a wife form device also viewed from the cutting blade side, and FIG. FIG. 7 is an overall side cross-sectional view of the wife formwork device as viewed from the side.

As shown in FIG. 4, a cutter head 3 is rotatably mounted on a bulkhead 2 in front of a cylindrical skin plate 1a of an excavator body 1 by an intermediate support method. A large 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 an outer peripheral portion of the cutter head 3 via a jack 5 so as to be able to expand and contract (appear). A ring gear 6 is fixed to a rear portion of the cutter head 3.

A cutter turning motor 7 as cutter head driving means is attached to the partition 2, and a driving gear 8 of the cutter turning motor 7 meshes with the ring gear 6. Accordingly, when the cutter swing motor 7 is operated to rotate the drive gear 8, the cutter head 3 is rotated via the ring gear 6.

An appropriate number of agitators 11 are provided in a chamber 10 defined by the cutter head 3 and the partition 2, and each can be turned by an electric motor 12. In the chamber 10, outlets and inlets of a sludge pipe 13 and a sludge pipe 14 connected to and connected to a feeding and discharging apparatus behind the tunnel are opened.

A large number of shield jacks 16 are arranged on the ring-shaped reinforcing portion 15 on the rear side of the skin plate 1a at predetermined intervals in the circumferential direction, and a plurality of wife form jacks 17 (FIG. 5). Inside, 24 are arranged symmetrically. As shown in FIGS. 5 and 6, the end of the piston rod of the wand form jack 17 is pin-connected to a wand form 18 described below, which is disposed in the space between the inner form 19 and the skin plate 1a.

A support member 20 is attached to the ring-shaped reinforcing portion 15, and an inner mold 1 assembled with an erector 21 for assembling the inner mold 19 on the support member 20.
9 is provided with a shape holding device 22 for holding a perfect circle (shape). In FIG. 4, reference numeral 23 denotes a feeder device for the inner mold 19, 2
Reference numeral 4 denotes a demolding device, and reference numeral 40 denotes a pipe for placing concrete.

As shown in FIG. 7, the wand form 18 includes the skin plate 1a (the peripheral wall of the tunnel) and the inner form 19.
And a ring-shaped member for closing the space, and an outer peripheral surface of which is fitted with a wand form seal 25 for slidingly (elastically) in contact with the inner peripheral surface of the skin plate 1a and stopping (sealing) the water. Be mounted.

An inner form 19 is provided on the inner peripheral surface of the wife form 18.
A stainless gasket 26 as a plate-like packing for sliding (elastic) contact with the outer peripheral surface of the member to perform water sealing (sealing) of the portion is mounted, and a stainless steel gasket pushing-up device 27 as a gasket pushing-up device (symmetrical in FIG. 5). The stainless steel packing 26 is pushed up when necessary by the twelve stainless steel packing push-up jacks 28).

A concrete pouring hole 29 (see FIG. 5 and FIG. 6 at 16 locations arranged at equal intervals) penetrates the inside of the form 18 and hardened concrete. 6. A water expansion seal push-out device 31 (see FIG. 6, twelve water expansion seal push-out jacks 32) which pushes out the water expansion seal 30 to the joint surface of the pipe.
A dead concrete extruding device 33 (see FIG. 6, 16 dead concrete extruding jacks 34 symmetrically arranged) for extruding (peeling) dead concrete adhered to the end surface of the end form 18 is incorporated therein.

The stainless steel packing push-up device 27
As shown in FIG. 1 and FIG. 2, the inner peripheral surface of
A push-up plate 37 which is divided into a plurality of parts (12 parts in the illustrated example) in the circumferential direction, and is coupled with pins (or bolts) 36 so as to be movable in the front-rear direction (left-right direction in the drawing) of the excavator through long holes 35 respectively. And a stainless steel packing push-up jack 28 whose piston rod tip is pin-coupled to the rear end of each push-up plate 37 via a bracket 38, and a (head portion of) the stainless steel packing push-up jack 28. Fixed to the rear end face of the mold 18
And a support bracket 39 for supporting.

Then, all the stainless steel packing push-up jacks 28 are simultaneously extended and retracted in synchronization with the retracting (retracting) and inserting (forward) operations of the end mold 18 via a hydraulic control device (not shown). When all the stainless steel packing push-up jacks 28 are extended, the twelve push-up plates 37 move at the same time to the rear of the excavator (to the right in the drawing), and the leading end thereof is the tip half of the stainless packing 26. , And lifts it up and separates (floats) it from the outer peripheral surface of the inner mold frame 19 (see the chain line in FIG. 1).

The stainless steel packing 26 is formed by laminating strip-shaped plate members divided into a plurality of pieces in the circumferential direction over a plurality of layers (for example, three layers) with their dividing lines being shifted, and the tip side thereof is tapered. It is formed in a tapered cylindrical shape.

[Operation / Effect] With this configuration, the cutter turning motor 7 is operated to rotate the cutter head 3 and extend the shield jack 16 while feeding muddy water from the mud pipe 13 into the chamber chamber 10. When the excavator body 1 is propelled (advanced), a large number of cutter bits (and copy cutters 4) mounted on the cutter head 3 excavate the ground in front. The excavated earth and sand is discharged from the chamber chamber 10 to the outside by a mud pipe 14.

At this time, the propulsion reaction force of the excavator body 1 is applied to the inner mold 19 with which the tip of the piston rod of the shield jack 16 comes into contact with the concrete C which has already been cast and cured and hardened.
And frictional force. Also, with this excavation, the inner mold 19 is assembled at the forefront position by returning the pieces at the last position in turn by the demolding device 24 and the feeder device 23.

Further, with the excavation, the skin plate 1
Concrete C will be transferred to the space between a and the inner formwork 19. At this time, as shown in FIG. 3, in order to interpose a water expansion seal 30 (see FIG. 7) at the joint, the end form 18 is retracted (retracted) and inserted by the expansion and contraction operation of the end form jack 17. Forward) is repeated several times.

At the time of pulling-in (retreating) of the wife formwork 18, as shown in FIG. 3A, the push-up plate 37 is at the retracted position due to the contraction of the stainless steel packing push-up jack 28. The tip does not abut the tip half of the stainless steel packing 26. That is, the leading edge of the stainless steel packing 26 slides on the outer peripheral surface of the inner mold frame 19, so that the end mold frame 18 can be pulled in as before.

On the other hand, at the time of insertion (advance) of the wife formwork 18, as shown in FIG.
The stainless steel packing push-up jack 28 is located at the forward position by extension, and its front end abuts against the front half of the stainless steel packing 26 to slightly push it up. That is, the leading edge of the stainless steel packing 26 is separated from the outer peripheral surface of the inner mold 19, and when the end mold 18 is inserted, the leading edge of the stainless steel packing 26 contacts the outer peripheral surface of the inner mold 19, This prevents deformation and breakage, and prevents the sealing function from being impaired.

As described above, in the wand form device of the present embodiment, the deformation and breakage of the stainless steel packing 26 during insertion (advance) of the wand form can be reduced by the stainless packing push-up device 27 having a simple structure. Therefore, the present invention is most suitable for a muddy shield excavator employing ECL and interposing a water expansion seal 30 at the joint of concrete C.

In this embodiment, the tunnel excavator of the present invention is described as a muddy shield excavator. However, the present invention may be applied to an earth pressure type shield excavator or to a tunnel boring machine for excavating rock. You can also. In addition, it goes without saying that various changes can be made without departing from the spirit of the present invention.

[0030]

As described above in detail, the wife formwork apparatus of the tunnel excavator according to claim 1 of the present invention covers the excavated tunnel peripheral wall with the inner formwork at a predetermined interval, In a tunnel excavator, a space between the inner form and the peripheral wall is closed with a ring-shaped form, and concrete is directly driven into the space through the form. And a plate-like packing having a leading edge projecting rearward of the tunnel and slidingly contacting the outer peripheral surface of the inner formwork, and pushing up the platelike packing at the time of the insertion operation of the same formwork to raise the leading end edge to the inner formwork. The packing push-up device is provided to separate from the outer peripheral surface of the plate, so that the deformation and breakage of the plate-shaped packing during insertion (advance) of the end mold can be effectively prevented by the packing push-up device. And concrete The ideal technique th tunnel boring machine so as to interposed a water-swelling seal.

According to a second aspect of the present invention, there is provided a wand form device for a tunnel excavator, wherein the packing push-up device is divided into a plurality of pieces on an inner peripheral surface of the wand form in a circumferential direction and moves in the longitudinal direction of the tunnel. Since there are push-up plates freely arranged and push-up jacks respectively connected to these push-up plates one by one, the same operation and effect as in claim 1 can be obtained by a packing push-up device having a simple structure. can get.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a stainless-steel packing lifting device showing one embodiment of the present invention.

FIG. 2 is a plan view of a main part of the stainless steel packing.

FIG. 3 is an operation state diagram.

FIG. 4 is a side sectional view of a muddy shield excavator employing the same ECL.

FIG. 5 is an overall layout view of the wife formwork device, also viewed from the cutting blade side.

FIG. 6 is an overall layout view of the wife formwork device as viewed from the tail side.

FIG. 7 is an overall side sectional view of the wife form device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavator main body 1a Skin plate 2 Partition wall 3 Cutter head 4 Copy cutter 5 Jack 6 Ring gear 7 Cutter turning motor 8 Drive gear 10 Chamber room 11 Agitator 12 Electric motor 13 Mud feeding pipe 14 Drainage pipe 15 Ring-shaped reinforcement part 16 Shield Jack 17 Wife form jack 18 Wife form 19 Inner form 20 Support member 21 Electa 22 Shape holding member 23 Feeder device 24 Demolding device 25 Wife form seal 26 Stainless packing 27 Stainless packing push-up device 28 Stainless packing push-up jack 29 Concrete casting 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 Slot 36 Pin 37 Push-up press Port 38 Bracket 39 Support bracket 40 Piping for concrete casting

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Yamada 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi, Hyogo Prefecture Inside the Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Hiroyuki Kawaguchi 1-chome, Shibaura, Minato-ku, Tokyo No. 2-3 Shimizu Corporation (72) Inventor Toshimitsu Aso 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Maho Watanabe 1-2-3, Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Kazuo Miyazawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Shinichi Nishimura 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation F-term (reference) 2D055 BA01 DA03

Claims (2)

[Claims] 1. An excavated tunnel wall is covered with an inner mold at a predetermined interval, and a space between the inner mold and the peripheral wall is closed with a ring-shaped end form. In the tunnel excavator in which concrete is directly poured into the space, the end form is provided with a plate-shaped packing which protrudes rearward of the tunnel and slides on the outer peripheral surface of the inner form. And a packing pushing-up device for pushing up the plate-like packing at the time of insertion operation of the same formwork to separate the front end edge from the outer peripheral surface of the inner formwork. 2. The packing lifting device comprises: a lifting plate which is divided into a plurality of pieces in the circumferential direction on an inner peripheral surface of the end form and is movably disposed in a longitudinal direction of the tunnel; 2. A wand formwork device for a tunnel excavator according to claim 1, further comprising a push-up jack each of which is coupled to one end.