JP4549990B2 - Shield machine - Google Patents

Description

  The present invention relates to a shield machine.

Conventionally, cast-in-place lining concrete placement by the shield method has a method of directly placing it on a natural ground without using an external formwork, or a method of embedding an external formwork when using an external formwork. In addition, there is an invention of a shield machine of Japanese Patent No. 3069619. This shield machine is a method in which an outer ring and an inner ring, which are double piped with a taper, are pushed and pulled with a hydraulic jack, and the mold is moved up and down with a taper to remove the mold.
Japanese Patent No. 306919

  However, since the shield machine as described above is composed of an outer ring and an inner ring that are double-pipeed, there is a problem that the construction cost increases because the formwork is thick and the outer diameter of the excavation becomes large. there were.

  This invention is made | formed in view of the above problems, The objective is to provide the shield machine which can make a drilling outer diameter small.

In order to solve the above problems, a shield machine has a slide plate installed on the inner side of the tail plate of the shield machine so as to face the inner peripheral surface of the tail plate. The slide plate is slidably provided on a guide pipe projecting from the inner peripheral surface of the skin plate, and a tube for reducing diameter is provided between the outer peripheral surface of the slide plate and the inner peripheral surface of the skin plate. An expansion tube is provided between the flanges at both ends of the slide plate and a receiving piece attached to the inner peripheral surface of the tail plate and facing the inner surface of the flange plate, When the outer frame expands due to tube expansion, the diameter reducing tube contracts. When the outer frame contracts due to expansion of the diameter reducing tube, the diameter expansion tube contracts. And wherein the Rukoto. Moreover, the tube for diameter reduction and the tube for diameter expansion include being divided and provided in multiple along the circumferential direction.

  Since the shield machine has a compact configuration, the outer diameter of the tunnel excavation can be reduced. In addition, by sliding the slide plate by expanding and contracting the diameter expanding tube and the diameter reducing tube, the backing material and the earth and sand can be smoothly performed without being bitten. Further, since the mechanism of the outer mold has been simplified, cleaning and repair maintenance can be easily performed. Further, the operating range of the slide plate can be adjusted by the thickness of the diameter increasing tube and the diameter reducing tube. In addition, since the tube for diameter reduction and the tube for diameter expansion are divided into a plurality along the circumferential direction, in the event of damage, only the damaged tube can be replaced, minimizing the replacement work. It can be suppressed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a shield machine according to the present invention will be described in detail with reference to the drawings. The shield machine 1 forms an annular inner mold 5 inside the tunnel housing 4 to place concrete in the tail plate 3 of the skin plate 2 of the shield machine, and the inner side of the inner mold 5 A concrete jack 6 is provided, and includes a propulsion jack 7 for propelling the shield machine 1 by applying a reaction force to the inner mold 5 and a press jack 8 for dehydrating the concrete 6 under pressure. An outer frame 9 is provided inside the plate 3.

  1 to 4 are sectional views of the tail plate 3, and an outer mold frame 9 and an inner mold frame 5 are formed on the inner side of the tail plate 3, and a cast-in-place concrete 6 for lining is placed between them. Has been.

  The outer frame 9 is provided with a fixing bolt 11 on a slide plate 10 provided inside the tail plate 3, and the slide plate 10 is provided along the circumferential direction so as to face the inner surface of the tail plate 3. . That is, the outer mold frame 9 is provided by being divided into three in the circumferential direction, and each divided piece is installed on the slide plate 10. Note that the outer mold 9 is not limited to three divisions as described above, and may be a division number greater than or less than this.

  The slide plate 10 has a dish-like cross section, and flanges 12 bent upward are formed at both ends, and a guide pipe 13 is inserted into a guide pipe 14 projecting from the inner surface of the tail plate 3 so as to extend inward and outward. It is slidable.

Further, a receiving piece 15 attached to the inner peripheral surface of the tail plate 3 is provided inside the collar piece 12 so as to be opposed, and a tube for expanding the diameter 16 is installed between the receiving piece 15 and the collar piece 12. ing. Further, a diameter reducing tube 17 is installed between the skin plate 2 and the slide plate 10.

  The diameter-expanding tube 16 and the diameter-reducing tube 17 differ only in size and are divided into a plurality of parts along the circumferential direction of the inner surface of the skin plate 2, and these are expanded and contracted by a compressor (not shown). It is free.

  Therefore, the diameter-expanding tube 16 and the diameter-reducing tube 17 are expanded and contracted by a compressor. As shown in FIG. 5, when the diameter-expanding tube 16 is filled with air, the diameter-reducing tube 17 contracts and slides. When the plate 10 moves outward (upward in the drawing) using the guide pipe 14 as a guide, the outer mold 9 spreads outward.

  On the other hand, as shown in FIG. 1, when the diameter reducing tube 17 is filled with air, the diameter increasing tube 16 contracts, and the slide plate 10 uses the guide pipe 14 as a guide, and the inside (the upper side in the drawing). ) To move the outer mold frame 9 inward.

  Next, a tunnel lining method using the shield machine 1 will be described. First, as shown in FIG. 1, the outer mold 9 is set with the propulsion jack 7 and the press jack 8 pulled back. At this time, the outer mold 9 is moved inward, that is, in a state where the tube 17 for reducing diameter is filled with air and pushed out inward.

  Next, the inner mold 5 is assembled by segments inside the outer mold 9 and the pushing jack 7 is pressed against the inner mold 5 and set, and the press jack 8 is also pushed to the wife mold 18. Press.

  Then, concrete 6 is placed in the space formed by the inner mold 5 and the outer mold 9, and the concrete 6 is pressed by a press jack 8 and dehydrated by pressure to be cured for a predetermined period.

  After completion of this curing, as shown in FIG. 5, the diameter expansion tube 16 is filled with air and expanded, and the outer mold frame 9 is expanded outward by drawing out the air from the diameter reduction tube 17 and contracting. Separate from concrete 6.

  Next, a reaction force is applied to the inner mold 5, and the shield machine 1 is advanced by the propulsion jack 7.

It is a cross-sectional view of a shield machine. It is sectional drawing of the tail plate in a skin plate. It is the sectional view on the AA line of FIG. It is a perspective view of an outer formwork. It is sectional drawing of the tail plate in a skin plate. FIG. 6 is a sectional view taken along line B-B in FIG. 5. It is a perspective view of an outer formwork.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield machine 2 Skin plate 3 Tail plate 4 Tunnel frame 5 Inner form frame 6 Concrete 7 Propulsion jack 8 Press jack 9 Outer form frame 10 Slide plate 11 Fixing bolt 12 Grain piece 13 Guide pipe 14 Guide pipe 15 Receiving piece 16 Expansion Diameter tube 17 Reduced diameter tube 18 Wife formwork 19 Backfill injection

Claims (2)

A slide plate is installed inside the tail plate of the shield machine so as to face the inner peripheral surface of the tail plate, and an outer mold frame is provided along the circumferential direction on the slide plate, and the slide plate is a skin plate. A guide pipe projecting from the inner peripheral surface of the slide plate is slidably provided, a tube for reducing diameter is provided between the outer peripheral surface of the slide plate and the inner peripheral surface of the skin plate, and flanges at both ends of the slide plate; A diameter-expanding tube is provided between a receiving piece attached to the inner peripheral surface of the tail plate and facing the inner surface of the collar piece. When the outer mold is expanded by expansion of the diameter-expanding tube, the diameter-reducing tube is used. A shield machine according to claim 1, wherein when the tube contracts and the outer mold frame contracts due to expansion of the diameter reducing tube, the diameter expanding tube contracts.   2. The shield machine according to claim 1, wherein the diameter-reducing tube and the diameter-expanding tube are divided into a plurality along the circumferential direction.

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