JP3104147B2 - Shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine for excavating a tunnel or the like.

[0002]

2. Description of the Related Art In the construction of a submarine crossing tunnel, there is a problem that there is a shortage of a shaft site on the ground. For this reason, there is an increasing demand for construction in which a long distance excavation is performed by a shield machine to reduce the number of shafts to be installed. However, when performing long-distance excavation, abrasion of a bit attached to a cutter of a shield machine becomes a problem. Therefore, there has been proposed a shield machine in which a spherical work chamber provided with an excavator is provided in front of the shield machine, and the spherical work chamber is rotated to change a bit of a cutter. FIG. 6 is a front view of a conventional shield machine A. Shield machine A
The spokes B are arranged radially from the center of the turntable C. However, the spoke B alone cannot excavate the outer peripheral portion D. For this reason, the overcutter E stored in the spoke B extends to the outer peripheral portion D, and the outer peripheral portion D is dug.

[0003]

Problems to be Solved by the Invention The above-mentioned conventional shield machine has the following problems. <B> Since the overcutter is arranged radially from the center of the turntable, the amount of expansion and contraction of the overcutter is limited. For this reason, it is not possible to obtain a large excavated area near the outer periphery of the shield machine.

<B> The overcutter cannot be formed thick because the overcutter is housed inside the spokes of the central cutter fixed to the rotating disk. Further, since the overcutter is supported by one spoke, there is no durability against excavation.

<C> Excavation is limited because the overcutter has no bit. Even if a bit is attached to the over cutter, there is a limit in terms of area.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a shield machine having a large surplus area and an excellent durability. .

[0007]

SUMMARY OF THE INVENTION The present invention provides an outer shell of a machine, a spherical working chamber rotatably mounted at the tip of the outer shell, and a propulsion installed at a rear end of the outer shell. A jack and an excavator having a disk cutter installed in the spherical working chamber and protruding from an opening of the spherical working chamber, wherein the spherical working chamber is rotated so that the cutter faces the inside of the outer shell. A ring-shaped outer cutter that is arranged on the outer periphery of the front of the machine and rotates by engaging with a disk cutter, and is slidable on the disk cutter in a direction substantially perpendicular to the axis of the machine. The cartridge bit is mounted on the outer peripheral cutter when excavating, and the cartridge bit is stored in the outer diameter of the disk cutter when the spherical working chamber rotates. A shield machine to butterflies.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. <A> Overall Configuration The shield machine 10 includes an outer shell 20, a spherical working chamber 30, an excavator 40, and a propulsion jack 50. Hereinafter, each part will be described in detail.

<B> Outer Shell The outer shell 20 is formed of a cylindrical body having both ends opened, and is a part for shielding each member.

<C> Spherical working chamber The spherical working chamber 30 is formed of a sphere having an opening 31. The spherical working chamber 30 is disposed at a tip end in the outer shell 20 and is rotatably attached by expansion and contraction of a rotary jack 32.

<D> Drilling Apparatus The drilling apparatus 40 includes a driving unit 41, a rotating shaft 42, a disk cutter 43, and an outer peripheral cutter 44. The drive unit 41 has a function of rotating the rotating shaft 42 and extending and contracting it. The rotation shaft 42 is provided toward the center of the opening 31 of the spherical working chamber 30. The disk cutter 43 is a flat disk disposed at the tip of the rotating shaft 42, and moves integrally with the rotating shaft 42. On the surface of the disk cutter 43, fixed bits 45 and cartridge bits 46 are alternately arranged radially from the center. Fixed bit 45
Is fixed on the disk cutter 43. As shown in FIG. 4, the cartridge bit 46 is locked in a groove 47 provided on the disk cutter 43, and can slide in the groove 47. The sliding of the cartridge bit 46 is performed by a known method. For example, it can be performed by a pinion rack type or a multi-stage hydraulic jack as shown in FIG. The outer peripheral cutter 44 is a ring-shaped flat plate, and is disposed on the outer peripheral portion of the front surface of the outer shell 20. This outer cutter 4
An outer peripheral bit 48 and a groove 49 are provided on the surface of the fourth member 4. The outer peripheral bit 48 is fixed to the outer peripheral cutter 44. The groove 49 is formed on the extension of the groove 47 of the disk cutter 43 alternately with the outer peripheral bit 48. In addition, as shown in FIG.
Is connected to the disk cutter 43 by a pin 60 protruding therefrom. Further, as shown in FIG. 5, the outer peripheral cutter 44 is supported by the support rod 21 projecting from the front surface of the outer shell 20 when the cartridge bit 46 is replaced.

<E> Propulsion Jack The propulsion jack 50 is fixed to the rear end of the outer shell 20.
As the propulsion jack 50, a well-known one can be employed.

[0013]

Next, a construction method using the shield machine 10 will be described. <A> Excavation work The opening 31 of the spherical working chamber 30 is directed toward the opening end of the outer shell 20, the rotation shaft 42 of the excavator 40 is extended, and the disk cutter 43 is positioned in front of the shield machine 10. .
Groove 47 of disk cutter 43 and groove 49 of outer peripheral cutter 44
The position of the disk cutter 43 is adjusted so that the line is linear, and the cartridge bit 46 on the disk cutter 43 is moved onto the outer peripheral cutter 44. Then, the pin 60 is projected from the disk cutter 43 to fix the disk cutter 43 and the outer peripheral cutter 44 together. The support bar 21 protruding from the front surface of the outer shell 20 is stored. By rotating the driving unit 41, the disk cutter 43 and the outer peripheral cutter 44 are rotated.
Then, the propulsion jack 50 is extended to excavate a front surface equal to the outer periphery of the outer shell 20. Each time the excavation reaches a certain distance, the process of assembling the segment 51 inside the outer shell 20 and forming a tunnel is the same as the conventional process.

<B> Bit Replacement Work As the excavation progresses, the cartridge bit 46 wears out. The rotation of the drive unit 41 is stopped, and the cartridge bit 46 on the outer peripheral cutter 44 is moved onto the disk cutter 43. The support bar 21 installed on the front surface of the outer shell 20 is projected to lock the outer peripheral cutter 44. Then, the pin 60 is stored in the disk cutter 43. The rotating shaft 42 is contracted, and the spherical working chamber 30 is gradually rotated as shown in FIG. 4 so that the opening 31 is directed toward the inside of the outer shell 20. Since the excavated surface of the ground is held down by the curved surface of the spherical work chamber 30, collapse of the excavated surface can be avoided. The disk cutter 43 facing the inside of the outer shell 20 can be directly inspected, and the cartridge bit 46 can be easily replaced. Cartridge bit 46
Is completed, the spherical work chamber 30 is rotated again to continue the excavation work.

[0015]

As described above, the present invention has the following effects. <A> Since the cartridge bit for excavating the outer peripheral portion where wear is most severe moves on the disk cutter, the cartridge bit can be easily replaced by rotating the spherical working chamber.

<B> Since the cartridge bit is locked in the groove of the outer peripheral cutter during excavation, the cartridge bit is firmly fixed to the outer peripheral cutter. Therefore, the durability of the cartridge bit is improved.

<C> If the mechanism for moving the cartridge bit is performed by a pinion rack method or the like, the so-called extra dug portion performed by the outer peripheral cutter can be made larger than the outer diameter of the shield machine.

<D> Since the surplus digging portion of the face is pressed by the outer peripheral cutter with the surface, the collapse of the excavated ground when excavation is stopped can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a shield machine.

[Figure 2] Front view of the shield machine

FIG. 3 is a side sectional view of a disk cutter and an outer peripheral cutter.

4 is a sectional view taken along line III-III in FIG.

FIG. 5 is an explanatory diagram of a bit replacement operation.

FIG. 6 is a front view of a conventional shield machine.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuko Kaneko 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation (72) Inventor Toshiaki Uehara 11-1 Kitahama-cho, Chita City, Aichi Prefecture Ishikawajima-Hari Ma Heavy Industries Co., Ltd.Aichi Factory (72) Inventor Hiroyuki Ito 11-1 Kitahama-cho, Chita-shi, Aichi Prefecture Ishikawajima-Hari Ma Heavy Industries Co., Ltd. 1-1 1-1 Machi Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. (72) Inventor Futoshi Nanase 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi, Hyogo Prefecture Kobe Shipyard, Mitsubishi Heavy Industries (56) JP-A-3-250195 (JP, A) JP-A-3-132597 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/08 E21D 9/06 301

Claims (1)

(57) [Claims] 1. An outer shell of a machine, a spherical working chamber rotatably installed at a front end portion of the outer shell, a propulsion jack installed at a rear end portion of the outer shell, and installed in the spherical working chamber. An excavator having a disk cutter protruding from the opening of the spherical working chamber, wherein the spherical working chamber is rotated so that the cutter faces the inside of the outer shell. A ring-shaped outer peripheral cutter that is arranged in a section and rotates by engaging with a disk cutter, and a cartridge bit that is slidably mounted on the disk cutter in a direction substantially perpendicular to the axis of the machine. The cartridge bit is sometimes moved onto the outer peripheral cutter, and the cartridge bit is stored within the outer diameter of the disk cutter when the spherical working chamber is rotated. .