JPH06146782A - Shield machine - Google Patents

Abstract

PURPOSE:To ensure a tail clearance without requiring measurement and facilitate posture control by providing projections connected to a segment at low friction to the inside of a tail section of a skin plate. CONSTITUTION:Projections 5 and 5 formed of roller bearings 4 and 4 or ball bearings provided to the foundational part as a contact body to a segment 2 are arranged to the inside of a tail section 3 of a skin plate of a shield machine 1 in the circumferential direction at a proper interval. When the shield machine 1 turns its center axis to a direction different from the center axis of the segment 2 and is driven, in the tail section 3 of the skin plate, the projections 5 are connected to the segment at low friction, and it is no obstacle to the driving of the shield machine 1. In addition, a tail clearance is ensured without requiring measurement, and posture control of the shield machine 1 is easily made.

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 In the shield construction method, a pipe body (shield excavator) larger than the outer diameter of the tunnel is put in the ground, and safe excavation work and lining work are performed inside the tunnel while preventing collapse, and a tunnel is easily constructed. It is a construction method.

The shield machine comprises a steel skin plate and a built-in propulsion jack, excavates soil at the front facet, assembles a segment inside, and mounts the segment with the propulsion jack. It takes power and promotes it.

The outer diameter of such a shield machine is such that a segment is assembled at the tail portion of the shield machine, and the shield inner diameter is determined in consideration of the margin during the tunnel curve and the outer diameter of the segment to determine the plate thickness of the skin plate. Determined after calculation.

When excavating a tunnel with a shield machine,
In particular, when there is a curved portion, it is necessary to change the direction of the central axis of excavation and the central axis of the lining as shown in Fig. 4, and in this case, in this case, between the inner diameter of the shield and the outer diameter of the segment. Clearance X is required. In the figure, 1 is a shield machine, and 2 is a lining segment. Further, when excavating in soft ground with a shield machine, there is a possibility of meandering, and the clearance X is necessary in order to constantly correct this.

Conventionally, in order to secure this clearance, measurement is performed manually or using a sensor, and the pushing method of the shield machine is changed so as to secure the tail clear amount.

[0007]

The method of securing the amount of tail clear by humans or sensors as described above is time-consuming and labor-intensive, and is more difficult if the shield machine is oriented in an improper direction. Becomes When using a sensor, there are variations depending on the accuracy of the sensor, and measurement may not be possible depending on the environment such as muddy water.

The object of the present invention is to eliminate the disadvantages of the conventional example, to reliably secure the amount of tail clear without measurement, to reduce the labor, and to carry out the skilled work in the attitude control of the shield machine. It is to provide a shield machine that is unnecessary.

[0009]

In order to achieve the above object, the present invention provides a protrusion for joining a segment with low friction inside the tail portion of a skin plate, and the protrusion is a tail. The gist is that they are arranged side by side inside the packing, and that the protrusions are bearings.

[0010]

According to the present invention as set forth in claims 1 and 3, as a result of the projection being joined to the segment at the tail portion of the skin plate, this limits the swing of the segment and the physical quantity is increased by the amount of this projection. Clearance is secured between the skin plate and the segment. In addition, since the protrusion is joined to the segment with low friction, it does not hinder the propulsion of the shield machine.

According to the second aspect of the present invention, in addition to the above-mentioned action, the projection is arranged inside the tail packing, and the backfill injection material of the segment is stopped by the tail packing, and the projection is It is not exposed to backfill injection material.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a vertical sectional side view showing a first embodiment of a shield machine of the present invention, FIG. 2 is a vertical sectional rear view of the same as above, and 1 is a shield (digging) machine as in FIG. 4 showing the conventional example.

According to the present invention, the projection 5 is formed by providing the roller bearing 4 inside the tail portion 3 of the skin plate of the shield machine 1 as a base for contacting the segment.
Were arranged side by side at appropriate intervals in the circumferential direction. In the figure, 2a is an existing segment, and 2b is an assembled segment.

The rows of the protrusions 5 in the circumferential direction are provided side by side inside the tail packing 6 provided at the end of the tail portion 3. Further, a plurality of rows are provided at intervals in the head direction of the shield machine 1. Good.

Further, as a second embodiment, as shown in FIG. 3, the projection 5 is provided with a ball bearing 7 as a contact body at a portion serving as a base.

Further, although not shown in the drawings, as another embodiment, the projection 5 is a (semi) spherical mass made of metal, hard rubber or synthetic resin, which is placed inside the tail portion 3. It is also possible to install it directly.

In this way, the assembled segment 2b is assembled into a ring by the segment erector in the tail portion 3 of the shield machine 1 and combined with the existing segment 2a to form the lining. When excavating the shaft by changing the direction from the central axis of the segment, the protrusion 5 is joined to the segment at the tail portion 3 of the skin plate as shown in FIG.

The protrusion 5 limits the swing of the segment in the tail portion 3, and a clearance is physically secured between the skin plate and the segment by the amount of the protrusion 5.

Further, since the roller bearing 4, the ball bearing 7 and the like are joined to the segment with low friction, the projection 5 does not hinder the propulsion of the shield machine 1.

[0020]

As described above, the shield machine of the present invention can surely secure the amount of tail clear without measuring, and can reduce the labor required for the measurement up to now, and the amount of tail clear can be reduced. Skilled work for controlling the attitude of the shield machine to secure it is also unnecessary.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of a shield machine according to the present invention.

FIG. 2 is a vertical cross-sectional rear view showing the first embodiment of the shield machine of the present invention.

FIG. 3 is a longitudinal rear view showing a second embodiment of the shield machine of the present invention.

FIG. 4 is a curvature relationship diagram between a shield machine and a segment.

[Explanation of symbols]

 1 ... Shielding machine 2 ... Segment 2a ... Existing segment 2b ... Assembly segment 3 ... Tail part 4 ... Roller bearing 5 ... Projection 6 ... Tail packing 7 ... Ball bearing

Claims (3)

[Claims] 1. A shield machine, characterized in that a protrusion that is joined to a segment with low friction is provided inside a tail portion of a skin plate. 2. The shield machine according to claim 1, wherein the protrusions are arranged inside the tail packing. 3. The shield machine according to claim 1 or 2, wherein the projection is a bearing such as a roller bearing or a ball bearing.