JP2001193387A - Shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify and strengthen structure of a supporting point serving as the rotation center of a cutter face plate. SOLUTION: A cutter head 4 arranged in front of a shield shell body 2 and formed into an optional spherical shape is fixed to a spherical bearing 6 arranged freely rotationally on a partition wall 3 in the shield shell body 2 via a shaft 13. A cutter head driving shaft 14 matching the shaft 13 is fixed in the spherical bearing 6, while at least a pair of hydraulic jacks 15, 16 turning the free end of the cutter head driving shaft 14 into an optional shape while using the spherical bearing 6 as a fulcrum is arranged between the cutter head driving shaft 14 and the shield shell body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavator for constructing a shield tunnel having an arbitrary cross section such as a rectangle, an ellipse, and a horseshoe.

[0002]

2. Description of the Related Art First, the principle of an arbitrary cross-section shield construction method capable of constructing a shield tunnel having a minimum cross section in an arbitrary shape will be described. As shown in FIG. 4, a rotor 32 is fixed at right angles to two rotating shafts 31, and is attached to an end of the rotor 32 via a linear excavator (cutter) 33 or a rotatable bearing. I have.

[0003] When the two rotating shafts 31 rotate in the same direction, the cutter 33 performs a parallel link motion and moves in a range surrounded by a dashed line. That is, the oblong section 34 is excavated by the linear cutter 33.

According to the excavation principle, a plurality of parallel link excavation mechanisms are combined and a cutter frame having a shape substantially similar to the cross-sectional shape to be excavated is provided, so that various types such as a circle, a rectangle, an ellipse, a horseshoe, an annulus, etc. Can be excavated by the circular motion of the cutter frame.

[0005] However, in this arbitrary cross-section shield method, since the cutter frame rotates in a plane to cut the face, it is difficult to cope with an arbitrary cross-section, and there are portions that cannot be cut.

On the other hand, a cutter shaft fixed to a spherical cutter face is supported and connected to a through hole of a partition wall through a semicircular groove on the outer periphery of the sleeve. A swinging shield machine has been proposed (Japanese Patent Publication No. 6-96947).

However, the above-mentioned bearing point needs to swing the cutter shaft up, down, left and right around the bearing point as a center of rotation, and at the same time, supports the cutter shaft in a freely rotatable manner. ing.

Further, there is another problem that the cover covering between the outer periphery of the sleeve and the partition wall is easily damaged due to its flexibility. Further, since a slide gear, that is, a screw shaft, is used as a driving mechanism of the cutter face, many parts other than the slide gear, that is, devices, are required, and the structure is complicated.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object the following:
An object of the present invention is to provide a shield machine capable of sufficiently supporting cutting of an arbitrary cross section, and simplifying and stiffening a structure of a bearing point serving as a rotation center of a cutter face plate. It is another object of the present invention to provide a shield machine capable of simplifying a driving mechanism of a cutter head.

[0010]

In order to solve the above-mentioned problems, a shield machine according to the present invention is provided with a cutter head having a spherical shape and an arbitrary shape when viewed from the front in front of a cylindrical shield shell. The cutter head is fixedly mounted on a spherical spherical bearing rotatably provided on a partition wall in a shield shell via a support shaft,
A cutter head drive shaft corresponding to the support shaft is fixed to the spherical bearing, and the free end of the cutter head drive shaft is formed between the cutter head drive shaft and the shield shell with the free end of the cutter head having an arbitrary shape. At least one pair of hydraulic jacks that are turned in a cross-section are cross-linked.

As described above, the cutter head having a spherical shape and an arbitrary shape when viewed from the front is fixed to the spherical spherical bearing rotatably provided on the partition wall in the shield shell via the support shaft. The cutter head can be swung in any direction with the bearing as the center of rotation, and it is possible to sufficiently cope with an arbitrary cross section.

Further, since the center of rotation of the cutter head is a spherical bearing having a spherical shape, the structure can be simplified and made more robust than a conventional bearing using a sleeve and a flexible cover. Further, since a hydraulic jack is used as a driving means for rotating the cutter head, simplification can be achieved as compared with a conventional driving means using a slide gear.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a shield machine according to the present invention. FIG. 1 shows only a part of a cutter driving mechanism and a screw conveyor, and omits other equipment such as a shield jack and an erector necessary for shield excavation work.

As shown in FIG. 1, the shield machine 1
A partition wall 3 is provided inside a cylindrical (in this case, horseshoe cross-section) shield shell 2, and the inside of the shield shell 2 is partitioned into an excavated portion and a shield machine space. In front of this partition 3,
That is, the cutter face plate 4 is disposed in front of the shield shell 2, and a large number of drill bits 5
Is fixed.

The cutter face plate 4 is formed in a spherical shape centered on a center O of a spherical bearing 6 described later, and is formed in a horseshoe shape when viewed from the front (see FIG. 2).

A screw conveyor 8 is provided below the bulkhead 3 so as to face the sediment inlet 7 on the side of the excavation part. The earth and sand excavated by the cutter faceplate 4 is formed between the cutter faceplate 4 and the bulkhead 3. After being taken into the chamber 9 between
It is discharged out of the machine by the screw conveyor 8. This type of shield machine is generally of the earth pressure type, but when the water stopping effect of the screw conveyor is insufficient, a mud pressure type or a water type is adopted.

A spherical bearing 6 having a spherical shape is fitted in a spherical bearing fitting hole 10 provided at the center of the partition wall 3 so as to be rotatable in any direction. The spherical bearing 6 is supported by a bearing casing 11 fixed to the back surface of the partition 3. The bearing casing 11 is attached to the partition wall by bolts (not shown). In addition, the spherical bearing fitting hole 10
A seal member 12 is provided on the inner side of the housing to seal a gap between the spherical bearing fitting hole 10 and the spherical bearing 6.

The spherical bearing 6 has a support shaft 13 extending forward of the shield shell 2 and a cutter driving pin 14 extending rearward of the shield shell 2. And
The cutter face plate 4 is fixed to the free end of the support shaft 13, and a pair of hydraulic jacks 15 and 16 are bridged between the cutter drive pin 14 and the shield shell 2.

One hydraulic jack 15 is disposed vertically, the cylinder part 17 is pivotally supported by a bracket 19 installed at the bottom of the shield shell 2 by a pin 18, and the piston shaft part 20 is connected to a spherical bush 21. It is attached to the cutter driving pin 14 through the. The other hydraulic jack 16 is disposed horizontally, the cylinder portion 22 is attached to the side of the shield shell 2, and the piston shaft portion is attached to the cutter driving pin 18 via the spherical bush 23. I have.

The pair of hydraulic jacks 15 and 16 are controlled by a control device (not shown), and the rear end of the cutter drive pin 14 is horseshoe-shaped with the midpoint O of the spherical bearing 6 as a fulcrum.
Alternatively, it is turned or rotated in a home base shape.

Next, the excavating operation of the horseshoe-shaped cutter face plate will be described.

As shown in FIG. 2, a horseshoe-shaped cutter face plate 4 is provided.
Is turned around the center O of the spherical bearing 6 about the center of rotation as a home base, and a horseshoe-shaped shield tunnel T is excavated by the horseshoe-shaped cutter face plate 4.

That is, when the tip of the support shaft 13 is lifted from the position shown in FIG. 3A to the position shown in FIG. 3B, the hatched portion a is cut.

Next, when the tip of the support shaft 13 is raised obliquely from the position shown in FIG. 3B to the position shown in FIG. 3C, the hatched portion b is cut.

Next, when the tip of the support shaft 13 is obliquely lowered from the position shown in FIG. 3C to the position shown in FIG. 3D, the hatched portion c is cut.

Next, when the tip of the support shaft 13 is lowered from the position shown in FIG. 3D to the position shown in FIG. 3E, the hatched portion d is cut.

Finally, when the tip of the support shaft 13 is moved laterally from the position shown in FIG. 3 (e) to the position shown in FIG. 3 (f), the hatched portion e is cut. As a result, as shown by the solid line, a horseshoe-shaped shield tunnel T is excavated.

In the above description, the case of excavating the horseshoe-shaped shield tunnel using the horseshoe-shaped cutter face plate has been described. However, the present invention is not limited to this. Drill shield tunnels. For example, turning an elliptical cutter face plate into an elliptical shape can excavate an elliptical shield tunnel.

[0030]

As described above, the present invention relates to a spherical spherical bearing in which a cutter head having a spherical shape and an arbitrary shape in a front view is rotatably provided on a partition wall in a shield shell via a support shaft. Since the cutter head is fixed, it is possible to swing the cutter head in an arbitrary direction with the spherical bearing as a rotation center, and it is possible to sufficiently cope with an arbitrary cross section.

Further, in the present invention, since the rotation center of the cutter head is a spherical bearing, the structure of the cutter head is simplified and more robust than a conventional bearing using a sleeve and a flexible cover. Is now available.

Further, in the present invention, since the hydraulic jack is used as the driving means for rotating the cutter head, simplification can be achieved as compared with the conventional driving means using a slide gear.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shield machine according to the present invention.

FIG. 2 is an explanatory view of excavation of a shield tunnel having a horseshoe cross section.

3 (a) to 3 (f) are explanatory diagrams of excavation of a shield tunnel having a horseshoe-shaped cross section.

FIG. 4 is a diagram illustrating the principle of an arbitrary cross-section shield method.

[Explanation of symbols]

 2 Shield shell 3 Partition wall 4 Cutter head 6 Spherical bearing 13 Support shaft 14 Cutter head drive shaft 15, 16 Hydraulic jack

Claims (1)

[Claims] 1. A spherical shape in front of a cylindrical shield shell,
Further, a cutter head having an arbitrary shape in a front view is arranged, and the cutter head is fixed to a spherical spherical bearing rotatably provided on a partition wall in a shield shell via a spindle, and the spindle is attached to the spherical bearing. And at least one pair of hydraulic pressures for turning the free end of the cutter head drive shaft into an arbitrary shape with the spherical bearing as a fulcrum between the cutter head drive shaft and the shield shell. A shield machine with a jack cross-linked.