JP2001173388A - 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 definitely push out and peel off dead concrete at a predetermined time. SOLUTION: A peripheral wall of a driven tunnel is covered by inner formworks 19 at predetermined intervals, a space between this inner formwork 19 and the peripheral wall is closed with a ring-shaped gable formwork 18, the tunnel excavator for directly placing concrete C through the gable formwork 18 within the space described above is installed to a dead concrete pushing out device 33 for pushing out and peeling off the dead concrete DC hardened and stuck to the end face of the gable formwork. Then, the dead concrete pushing out device 33 has a plurality of push plates 35 arranged in plurality at predetermined intervals in the circumferential direction and a dead concrete pushing out jack 34 creating reciprocating motions for these push plates 35 between the push-out position and retreating position.

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]

By the way, in the above-mentioned wife formwork device, the concrete pouring opening penetrating in the longitudinal direction of the tunnel has a predetermined pitch (2.5 to 2.5) in the circumferential direction.
3m), and concrete casting pipes were connected to these pipes and concrete was poured directly.

[0005] Therefore, near the end face of the wand form located between the adjacent concrete pouring holes, the concrete flow hardly occurs due to the poor flow of the concrete, and the concrete at the concerned portion hardens early and adheres to the end face of the wand form. As a result, it becomes a larger mass (this is called dead concrete), and the sliding of the wand form device becomes poor, and the pressure gauge arranged on the wand form device does not accurately indicate the pressure of the poured concrete. There is a problem of adverse effects such as

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned circumstances, and has as its object to provide a wife formwork apparatus for a tunnel excavator capable of reliably extruding and peeling dead concrete at a predetermined time.

[0007]

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 dead concrete extruding device for extruding and separating dead concrete adhered to the end surface of the wand mold and hardened is attached to the wand form.

The dead concrete extruder has a plurality of push plates arranged at predetermined intervals in a circumferential direction and a jack for reciprocating the push plates between an extruding position and a retracted position. It is characterized by the following.

Further, a vibrator for vibrating the pressing plate is provided.

[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] [Configuration] FIG. 1 shows an embodiment of the present invention, and is a cross-sectional view of a dead concrete extruder for a wife formwork, and FIG.
A sectional view, FIG. 3 is an operation state diagram, and FIG.
L is a side sectional view of a muddy shield excavator employing L, FIG. 5 is an overall layout view of a wand form device also viewed from the cutting edge side, and FIG. 6 is an overall layout diagram of a wand form device also viewed from the tail side. , FIG.
FIG. 2 is an overall side sectional view of the wife form device.

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 symmetrical members are arranged. 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, sixteen equally spaced locations) 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 dead concrete extruder 33
As shown in FIGS. 1 and 2, a plurality of (16 in the illustrated example) horizontally long push plates 35 having a predetermined area are arranged at predetermined intervals in the circumferential direction of the wife formwork 18. There are 16 dead concrete extrusion jacks 34 for reciprocating the push plate 35 between the extrusion position and the retreat position via the connecting rod 36.

In the illustrated example, each of the pressing plates 35 is housed in the end form 18 together with the connecting rod 36, while each of the dead concrete extruding jacks 34 is attached to the rear end face of the end form 18 via a bracket 37 via a bracket 37. The part is supported sideways.

A vibrator 38 for vibrating the push plate 35 is provided between the side surface of each of the connecting rods 36 and the back surface of the push plate 35.

[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 is passed through the concrete casting pipe 40 from the concrete casting opening 29 of the end mold 18 into the space between the inner mold 19 and the space a.

In the vicinity of the end face of the end form 18 located between the concrete pouring holes 29 adjacent to each other, since the flow of the concrete C is poor, the concrete C in the relevant portion hardens quickly, and this It adheres to the end face of the formwork 18 to form a larger lump (see dead concrete DC in FIGS. 1 and 3), and if it is left as it is, the sliding of the wife formwork apparatus becomes poor or the pressure gauge arranged on the wife formwork Has an adverse effect such as not accurately indicating the pressure of the poured concrete.

However, in the present embodiment, the above state is detected by the hydraulic pressure of the wand mold jack 17 or the like, and a hydraulic control device (not shown) simultaneously extends the dead concrete extrusion jacks 34 by a predetermined stroke (about 50 mm). Let it.

As a result, the front half of each push plate 35 projects from the end surface of the end form 18 and the dead concrete DC adhered to the end surface of the end form 18 is extruded and peeled off, thereby avoiding the adverse effects. The extruded and exfoliated dead concrete DC is mixed into concrete C having good fluidity.

After extruding and peeling of the dead concrete DC, the push plates 35 are returned to the original position and the casting of the concrete C is continued. When the above state is detected again, each push plate 35 is protruded in the same manner as described above. You can do it.

Further, in this embodiment, since each pressing plate 35 is vibrated by the vibrator 38, the separation of the dead concrete DC from the end face of the end form 18 is promoted, and the dead concrete DC is applied to each pressing plate 35 itself. DC adhesion is avoided.

In this embodiment, the tunnel excavator of the present invention has been described as a muddy shield excavator. However, the present invention may be applied to an earth pressure type shield excavator or 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.

[0032]

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. In addition, a dead concrete extruder for extruding and peeling hardened dead concrete adhered to the end surface of the same formwork has been assembled, so it is possible to reliably extrude and peel dead concrete at a predetermined time. This can cause adverse effects such as poor sliding of the wife form device due to dead concrete, and the pressure gauge placed on the wife form not accurately indicating the pressure of the cast concrete. It is.

According to a second aspect of the present invention, there is provided a wand form device for a tunnel excavator, wherein the dead concrete extruding device comprises:
A plurality of push plates arranged at predetermined intervals in the circumferential direction;
Since the push plate is provided with a jack for reciprocating between the pushing position and the retracted position, the same operation and effect as those of the first aspect can be obtained with a simple structure.

According to a third aspect of the present invention, there is provided a wand form device for a tunnel excavator, wherein a vibrator for vibrating the pressing plate is provided, so that exfoliation of dead concrete from the end surface of the wand form is promoted. At the same time, the adhesion of dead concrete to each push plate itself is avoided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a push plate portion of a wife formwork according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

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 Press plate 36 Connecting rod 37 B Racket 38 Vibrator 40 Piping for concrete placement C Concrete DC Dead concrete

 ──────────────────────────────────────────────────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 (for reference) 2D055 DA03 GC09 KB03 KB14

Claims (3)

[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 a tunnel excavator in which concrete is directly poured into the space, the dead concrete adhered to the end surface of the wive form is extruded into the wive form.
A wife formwork device for a tunnel excavator, wherein a dead concrete extrusion device for peeling is assembled. 2. The dead concrete extruder,
A plurality of push plates arranged at predetermined intervals in the circumferential direction;
2. A wand formwork apparatus for a tunnel excavator according to claim 1, further comprising a jack for reciprocating the push plates between an extruding position and a retracted position. 3. The wife formwork device for a tunnel excavator according to claim 2, further comprising a vibrator for vibrating said push plate.