JPH11193691A - Shield boring machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the mechanism of a drilling device at drilling an elliptical tunnel, reduce the manufacturing cost, and simplify the construction control by providing a cutter slanting the cutter face on the end part of the skin plate of a shield machine. SOLUTION: In a skin plate 1 to be the outer shell of a shield machine, the section being at right angles to the axis of the shield machine is formed into an ellipse having a fixed flateness, and the hood opening 11 on the extreme end of a hood part is formed obliquely at a fixed angle. A circular cutter 2 conformed to the hood opening 11 is obliquely arranged on the hood opening 11, so that the shape in a view from the front in the advancing direction is made to be an ellipse, and when the shield machine is advanced in the axial direction by a shield jack while rotating the circular cutter 2 for drilling, an elliptical tunnel having the sectional shape of the skin plate 1 can be constructed. Because the elliptical tunnel can be drilled by the use of the circular cutter 2, the mechanism of the drilling device of the shield machine is simplified, and the manufacturing cost can be reduced. In addition, generation of eccentricity is reduced, and the construction control is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine.

[0002]

2. Description of the Related Art Circular shield machines have been improved and adapted to various ground conditions. However, since the completed cross section of the tunnel is circular, useless space is generated in the vertical direction for use in tunnels such as roads and railways. In addition, disposal of excavated soil accompanying the excavation of the useless space is also a major problem. Therefore, the cross section of the shield machine is made elliptical, thereby eliminating unnecessary space and reducing excavated soil.

[0003]

SUMMARY OF THE INVENTION The above prior arts include:
The following problems exist. <A> In the conventional elliptical shield machine, the shape of the cutter is made elliptical, so that the mechanism of the excavator becomes very complicated and the production cost increases.

<B> The conventional elliptical shield machine is apt to be eccentric due to its mechanism, and it is difficult to control the construction.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and when excavating an elliptical tunnel, simplifies the mechanism of the excavator of a shield excavator and reduces the production cost. It is an object of the present invention to provide a shield machine capable of reducing the number of work and simplifying construction management.

[0006]

As a means for solving the above-mentioned problems, the present invention provides a cutter at an end of a skin plate of a shield excavator with its cutter surface inclined. A shield machine.

In addition, a circular cutter is attached to an end of a skin plate having an elliptical cross section in a direction perpendicular to the axis of the shield.
Is provided with the cutter surface inclined. Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION <a> Skin Plate A skin plate 1 is an outer shell of a shield machine and protects an underground working space against earth pressure and water pressure. It has a structure that can receive the jack reaction force that gives thrust to the shield.

The skin plate 1 supports a hood portion for excavation at the front surface, a tail portion for lining at the rear portion, and an intermediate portion thereof to support the entire structure of the shield. It is composed of three parts, a girder part equipped with the like.

The skin plate 1 of the present invention has a cross section orthogonal to the axis of the shield machine in an elliptical shape having a predetermined flatness.

The hood opening 11 at the tip of the hood of the skin plate 1 is formed obliquely at a predetermined angle. The predetermined angle is an angle at which the shape of the hood opening 11 becomes circular when viewed from a direction perpendicular to the opening, as shown in FIG.

<B> Circular cutter The circular cutter 2 is a hood opening 1 of the skin plate 1.
This is a circular cutter corresponding to 1. This circular cutter
2 is configured by, for example, attaching a cutter bit 22 to the front surface of a circular cutter head 21.

As shown in FIG. 2, a circular cutter is used.
2 is arranged obliquely so as to match the hood opening 11. When this is viewed from the front in the traveling direction of the shield excavator, it becomes elliptical as shown in FIG. 2, and the tunnel can be constructed in an elliptical shape.

The drive shaft 23 of the circular cutter-2 has an angle with respect to the traveling direction of the shield machine, but the direction is controlled by controlling the propulsion jack. In addition, an intake window for excavated earth and sand is provided on the front surface of the circular cutter-2. Further, there is a case where an over cutter device is provided on a peripheral portion of the circular cutter-2.

<C> Other equipment Other equipment of the shield excavator include tail packing made of rubber or spring steel for preventing backflow of the backing material on the tail side, and shield excavation. Shield for jacking the machine, Segment Elector for grasping and transferring the segment and assembling it in place
It is equipped with a conveyor for transporting it to the rear of the machine.

[0016]

The shield jacking machine advances the shield excavator in the axial direction as shown in FIG. 2 while rotating the circular cutter-2 for excavation. Since the circular cutter 2 is disposed obliquely and has an elliptical shape when viewed from the front in the traveling direction, it is possible to construct an elliptical tunnel having a cross-sectional shape of the skin plate 1.

[0017]

[Other Embodiments] In the above embodiment, the case of constructing an elliptical tunnel has been described. However, in the case of constructing a rectangular tunnel, for example, a square cutter may be disposed diagonally to form a rectangular or A long and thin strip-shaped tunnel can be constructed. If an elliptical cutter with a small flattening factor is installed diagonally, an elliptical tunnel with a large flattening factor can be constructed.

[0018]

Since the present invention has been described above,
The following effects can be obtained. <A> Since an elliptical tunnel can be excavated using a circular cutter instead of the conventional elliptical cutter, the mechanism of the excavator of the shield excavator can be simplified and the production cost can be reduced. it can.

<B> By using a circular cutter,
It is possible to reduce the risk of eccentricity caused by a mechanical cause, and to simplify construction management.

<C> Square cutters are installed diagonally to build a rectangular or even longer strip-shaped rectangular tunnel, or elliptical cutters with a small flatness are installed diagonally to reduce the flatness. It is also possible to build large elliptical tunnels.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of one embodiment of the present invention.

Claims (2)

[Claims] 1. A shield excavator characterized in that a cutter is provided at an end of a skin plate of the shield excavator with its cutter surface inclined. 2. A circular cutter is provided at an end of a skin plate having an elliptical cross section in a direction perpendicular to an axis of a shield, the cutter having an inclined surface. Shield machine.