JPH1082276A - Shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive to speed up propulsion and accelerate the speed by providing a constant reaction force from a cylinder-shaped wall body which is being assembled. SOLUTION: A jack guide mechanism 21, which guides the movement of a rod 13 of a jack 11 is provided between a pressure member 14 provided at the tip of the rod 13 which constitutes a plurality of jacks provided along the inner peripheral surface of a cylinder-shaped skin plate 4 which constitutes an excavating machine main body provided with a cutter at the tip and the skin plate 4. The jack guide mechanism 21 comprises a pair of cross section-L- shaped rails 22 provided on the inner surface of the skin plate 4 along the axial direction, a rotary shaft 24 spanned on the rail 22, which is supported on the pressure member 14 provided near the tip of the rod 13 by means of a support member 26 so that it may cross the movement of the rod 13 at right angles, a roller 23 which rolls in contact with the inner surface of the skin plate 4 provided on the rotary shaft 24 and a pair of rollers 25 which are provided on both ends of the rotary shaft 24 and roll in contact with the rails 22.

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 assembling a cylindrical wall with segments by forming an excavation hole in the ground.

[0002]

2. Description of the Related Art Conventionally, as a method of constructing a tunnel, a shield method has been adopted in which a drilling hole is formed in the ground by a shield machine, segments are assembled with the drilling hole, and a cylindrical wall is constructed. I have. As a shield machine used in this type of shield construction method, there is known a shield machine in which a cutter is provided at a distal end side of a cylindrical skin plate that forms an outer shell of an excavator body and a jack is provided at a rear side. And according to this shield machine,
At the rear side, the ground is excavated and propelled by the cutter while obtaining the reaction force by the jack from the cylindrical wall body already assembled by assembling the segments, and after propulsion by the predetermined distance, the segments are assembled again behind it A cylindrical wall was being built.

[0003]

In recent years, there has been a demand for high-speed and rapid tunnel construction, and automatic assembly of segments has been performed. However, when a shield machine is to be propelled, a segment behind the segment is required. In the circumferential direction to form a cylindrical wall, and a reaction force must be obtained from the cylindrical wall by a jack, and it is still difficult to improve the propulsion speed of the shield machine. Was. In other words, when assembling the segments at the rear and simultaneously obtaining the reaction force by the jack from the segments that are not connected in a ring shape in the middle of the assembly and trying to always propel the shield machine, the jack tilts, The segments are pushed outward, and the segments may be displaced and hinder automatic assembly.

The present invention has been made in view of the above circumstances, and provides a shield machine capable of propelling while always obtaining a reaction force from a cylindrical wall being assembled without affecting automatic assembly. It is intended to be.

[0005]

In order to achieve the above object, a shield machine according to claim 1 is provided with a cutter at a tip end of a cylindrical excavator body, and excavates the ground with the cutter. A shield machine for propelling by obtaining a reaction force by a jack from a segment constituting a cylindrical wall body assembled on a rear side, wherein the jack has a skin plate forming an outer shell of the excavator body, A guide mechanism for guiding the jack rod in the forward and backward directions is provided. The shield machine according to claim 2, wherein in the shield machine according to claim 1, the guide mechanism includes a pair of rails provided on an inner surface side of the skin plate along an axial direction thereof, and a tip portion of the rod. A shaft provided in the vicinity so as to be orthogonal to the direction in which the rod advances and retreats, and extended over the rail; a roller provided on the shaft and rolling in contact with the inner surface of the skin plate; And a pair of rolling rollers which are provided at both ends of the section and roll by contacting the rail.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shield machine according to an embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a shield machine. This shield machine 1
Has a cylindrical excavator body 2 and a cutter 3 provided at the front end of the excavator body 2, and excavates the ground by rotating the cutter 3. . A driving device 5 for rotating the cutter 3 and an unloading device 6 for discharging the excavated earth and sand to the rear of the shield machine 1 are provided inside the skin plate 4 forming an outer shell of the excavator body 2.
And an erector device 7 for assembling the segments S constituting the cylindrical wall T.

Further, a plurality of jacks 11 are provided in the skin plate 4 along the inner peripheral surface on the rear side thereof in the circumferential direction. These jacks 11
As shown in FIGS. 2 and 3, the cylinder includes a cylinder 12, a rod 13 that is advanced and retracted from the cylinder 12, and a pressing member 14 provided at the tip of the rod 13. A jack guide mechanism 21 is provided between the skin guide plate 4 and the skin plate 4. Next, the jack guide mechanism 21 will be described. As shown in the figure, the jack guide mechanism 21 includes a pair of rails 2 having an L-shaped cross section and provided on the inner surface of the skin plate 4 along the axial direction.
2 and a pressing member 1 provided near the tip of the rod 13
4, a rotating shaft 24 supported by a supporting member 26 so as to be orthogonal to the advancing and retreating direction of the rod 13 and extending over the rail 22. A roller 23 that rolls
It has a pair of rolling rollers 25 provided at both ends of the rotating shaft 24 and rolling in contact with the rail 22.

According to the shield machine 1 in which the jack 11 is provided with the jack guide mechanism 21 as described above, when the rod 13 of the jack 11 is extended to obtain a reaction force from the segment S, the rod of the jack 11 13
Since the pressing member 14 provided at the tip of the jack 11 is guided by the jack guide mechanism 21 and the interval between the pressing member 14 and the skin plate 4 is kept constant, the rod 13 of the jack 11 can be extended without being displaced in the radial direction. Can be. As a result, even if the segment S that is assembling the tubular wall body T on the rear side of the shield machine 1 is not completely connected in the circumferential direction, thrust can be obtained from the segment S by the jack 11. That is, it is possible to eliminate the disadvantage that the segments S that are not connected in the circumferential direction are inclined outward in the radial direction due to the radial displacement of the jack 11.

Therefore, according to the shield machine 1, even when the segments S are not completely connected in the circumferential direction, the thrust can be obtained from the segments S and propulsion can be performed. The tunnel can be propelled, and the construction of the tunnel can be greatly speeded up and accelerated, and the construction period can be shortened.

[0010]

As described above, according to the shield machine of the present invention, the following effects can be obtained. When the jack is extended to obtain the reaction force from the segment, the jack is guided by the guide mechanism, and the distance between the jack and the skin plate is kept constant, so that the jack can be extended without being displaced in the radial direction. . As a result, the thrust can be obtained from this segment by a jack without completely connecting the segments assembled on the rear side of the shield machine in the circumferential direction. That is, it is possible to eliminate such a disadvantage that the segments that are not connected in the circumferential direction are inclined outward in the radial direction due to the radial displacement of the jack, which hinders automatic assembly. Therefore, even when the segments are not completely connected in the circumferential direction, the thrust can be obtained from the segments and propelled, whereby the shield machine can be propelled at the same time as the excavation, thereby greatly improving tunnel construction. High speed and speed can be achieved, and the construction period can be shortened.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shield machine illustrating a configuration and a structure of a shield machine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a part of the shield machine illustrating a configuration and a structure of the shield machine according to the embodiment of the present invention.

FIG. 3 is a rear view of a part of the shield machine illustrating a configuration and a structure of the shield machine according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield machine 2 Excavator main body 3 Cutter 4 Skin plate 11 Jack 13 Rod 21 Jack guide mechanism (Guide mechanism) 22 Rail 23 Roller 24 Rotation axis (shaft part) 25 Rolling roller S Segment T Cylindrical wall

Claims (2)

[Claims] 1. A cutter is provided at a tip end of a cylindrical excavator body, and while the ground is excavated by the cutter, a reaction force is obtained by a jack from a segment constituting a cylindrical wall assembled on a rear side. A shield mechanism for propelling the jack, wherein the jack is provided with a guide mechanism for guiding a rod of the jack in a reciprocating direction between the jack plate and a skin plate forming an outer shell of the excavator body. Shield machine. 2. The guide mechanism includes a pair of rails provided on an inner surface side of the skin plate along an axial direction thereof, and a pair of rails provided near an end of the rod so as to be orthogonal to the direction in which the rod advances and retreats. And a shaft provided on the rail, a roller provided on the shaft and rolling in contact with the inner surface of the skin plate, and a roller provided on both ends of the shaft and in contact with the rail. The shield machine according to claim 1, further comprising a pair of rolling rollers that roll.