JP3289250B2 - 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 and, more particularly, to a shield machine suitable for use in a small-diameter field.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show an example of a conventional shield machine. The shield machine is provided with a cutter head 10 equipped with a cutter bit for excavating a face, a screw conveyor 12 for discharging earth and sand excavated by the cutter head 10, and isolating the face from the inside of a tunnel (the inside of the shield machine). It is composed of partition walls. The muddy shield excavator is equipped with a feeding and discharging pipe instead of the screw conveyor 12. Cutter head 1 by drive motor 16
Rotate 0 to excavate the face. The driving force is the driving motor 16
Is transmitted to the cutter head 10 through the pinion 4, the drive gear 5, and the center shaft 13. The center shaft 13 is supported by bearings 1, 2, and 3.

[0003] A similar configuration is disclosed in, for example, Japanese Patent Application Laid-Open No. 2-4349.
No. 5 also discloses it.

[0004]

Such a conventional system has the following disadvantages. That is, in the small-diameter shield excavator, the drive motor 16 is arranged in a petal shape (19) about the rotation center of the cutter head 10, and the inside of the shield machine is narrow. In particular, in the case of a half-bending structure, there is interference between various devices (hydraulic devices such as the shield jack 56 and a hydraulic valve for operating the shield) at the time of half-folding, which limits the angle of the half-bending and separates hydraulic devices normally installed in the machine ( There were inconveniences such as on the rear bogie.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to widely use the inside of a shield machine by reducing the driving structure of a cutter head in a small-sized machine, particularly a shield machine having a narrow structure such as a shield excavator having a center bent structure. Also,
An object of the present invention is to make it possible to manufacture a shield machine at low cost by changing the structure.

[0006]

A feature of the present invention is that a cutter head is disposed on the entire face, a driving motor for rotating the cutter head via a center shaft, and
In a shield machine including a discharge unit that discharges earth and sand excavated by the cutter head, the drive motor has a spline on an inner peripheral side of a hole provided in a shaft center portion,
The center shaft is a support shaft provided at a desired interval.
Has a spline on the outer circumferential side along with therefore is supported on receiving the inserted said center shaft hole, wherein the drive motor and the center shaft is splined to each other, the drive motor is disposed between the support bearing Is to be.

[0007]

Since the drive gear can be omitted, the drive portion is concentrated at the center of the shield. Therefore, the inside of the shield machine can be widely used as compared with the case where the drive motor is arranged and mounted outside the center shaft. In addition, since the drive gear, pinion, and petal-shaped drive motor mounting structure can be omitted, it can be manufactured at low cost.

[0008]

1 and 2 show a first embodiment. The shield machine comprises a cutter head 10 equipped with a cutter bit for excavating a face, a screw conveyor 12 for discharging earth and sand excavated by the cutter head 10, and a partition 11 for isolating the face from the inside of the tunnel. The support of the center shaft 13 on which the cutter head 10 is mounted is carried out by bearings 1 and bearings 2 and 3 which are held by partition walls and arranged at desired intervals . These bearings 1,
The radial load and the thrust load received by the cutter head 10 are supported by 2 and 3. Bearing 1 and bearing 2
In between, a hydraulic motor 16 having a hole corresponding to the outer diameter of the center shaft 13 provided in the center is mounted. The mounting portion of the hydraulic motor is a portion where the conventional drive gear is mounted. The hydraulic motor 16 is attached to the partition wall 11 by bolts, and a spline is cut on the surface of the center hole, that is, on the inner peripheral side. 13 is transmitted. 14 is a piping hole,
Reference numeral 15 denotes a rotary joint, and reference numeral 18 denotes a shield.
Reference numeral 51 denotes a manhole, 52 denotes a tail seal, 53 denotes a segment, 54 denotes a center-bent spherical bearing, 55 denotes a center-bent jack, and 56 denotes a shield jack.

As the hydraulic motor 16, for example, a hydraulic balanced vane motor can be used. This hydraulic equilibrium vane motor has a wide rotation speed and torque range, and is directly connected to a drive shaft without using a joint.

In the prior art, three hydraulic motors 16 are mounted, whereas in the present invention, one hydraulic motor 16 is provided. Therefore, the capacity of the hydraulic motor 16 is designed to be three times larger than that of the conventional example so that the driving torque is not reduced.

Further, the shield excavator has a copy cutter 17 mounted in the cutter head 10 to cope with the direction correction, and it is necessary to bring hydraulic piping to the cutter head 10 in order to operate with a hydraulic jack. In addition, in the earth pressure shield, it is necessary to provide an injection pipe to the tip of the cutter head 10 in order to inject water or a viscosity-imparting material into the face. For this purpose, a holed hydraulic motor 16 is used, a hole 14 is made in the center of the center shaft 13 as in the conventional case, a pipe is passed through the hole 14 and a rotary joint 15 is attached to the rear end of the center shaft 13.

Since the driving gear 5 can be omitted as compared with the conventional example, the driving portion is concentrated at the center of the shield. Therefore, the inside of the shield machine can be widely used as compared with the case where a plurality of drive motors 16 are arranged and mounted outside the center shaft 13. In addition, since the drive gear 5, the pinion 4, and the petal-shaped drive motor mounting structure can be omitted, it can be manufactured at low cost.

Since the screw conveyor 12 is mounted at an angle, the screw conveyor 12 can be prevented from interfering with the screw conveyor 12 by mounting a perforated drive motor 16 at the base of the screw conveyor 12.

A second embodiment is shown in FIGS. In this embodiment, by using a bearing built in the hydraulic motor 16 instead of the bearing 3 as a radial bearing, the structure can be simplified and the center shaft 13 can be made shorter.

When a thrust load can be received by a bearing built in the hydraulic motor 16 instead of the bearing 2, the bearing 2 in the figure can be omitted.

[0016]

According to the present invention, an effective space is provided in the shield machine, and the structure is simplified and the cost is reduced.
Further, since the number of the driving devices of the cutter head is one, the control becomes much easier than in the case where the number of the driving devices is several, such as when controlling the rotation speed and the torque of the cutter head.

[Brief description of the drawings]

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

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

FIG. 3 is a longitudinal sectional view of the shield machine according to the present invention.

FIG. 4 is a longitudinal sectional view of a conventional shield machine.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bearing 2 ... Bearing 3 ... Bearing 10 ... Cutter head, 11 ... Partition wall, 12 ... Screw conveyor, 13 ... Center shaft, 16 ... Hydraulic motor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 9/08 E21D 9/06 301 E21D 9/10

Claims (2)

(57) [Claims] 1. A shield machine comprising: a cutter head disposed on the entire face; a drive motor for rotating the cutter head via a center shaft; and discharging means for discharging earth and sand excavated by the cutter head. the drive motor has a splined on the inner peripheral side of the hole provided in the axial center portion, the center shaft has a spline on an outer peripheral side while being thus supported by the supporting bearings arranged at desired intervals The center excavator is inserted into the hole, the drive motor and the center shaft are spline-coupled to each other, and the drive motor is disposed between the support bearings. 2. A shield machine according to claim 1, wherein said drive motor is a hydraulic equilibrium vane motor.