JPH01199000A - Spiral segment - Google Patents

Abstract

PURPOSE:To increase a daily advance amount without stopping a shield and to prevent rolling of a shield machine, by a method wherein spiral segments are intercoupled in succession to form a spiral annulus ring cylinder. CONSTITUTION:Spiral segments 6, assembled in succession and manufactured in a shape in which the spiral segments are joined together by means of bolts to form an annulus ring cylinder, is prepared. A shield machine is pressed against the segments 6 through the medium of a reaction force plate 5, having a specified slope in a circumferential direction, through the working of a jack 4 to perform repulsion of the segments 8. Only a shield jack 7 for a new segment 8 part is fastened, and the segment 8 is coupled to the existing segment 6 for assembly. Thereafter, other shield jack continues to push the segment 6 without a stop to perform propulsion of a shield body, and on completion of coupling of the segment 8, the segment 8 is pushed by the jack 7.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a primary lining segment for a tunnel excavated by a shield type tunnel machine.

(Prior Art) Conventionally, steel or concrete segments have been used for the primary lining of tunnels excavated by shield machines, and these segments support the excavated ground and serve as the propulsion reaction of the shield machine. It is used for supporting force.

In addition, the shape of this segment is annular with the required thickness, the width approximately corresponds to the length of one stroke of the shield jack, and it is divided into several parts parallel to the tunnel axis. After excavating one stroke, stopping the excavation and assembling one ring using bolts, etc. within the tail shield of the shield machine, and also connecting the existing segments front and rear.

After the segment is assembled, the shield machine starts digging while pushing the segment with the shield jack. In this way, in shield construction using conventional segments, excavation is required.

It is constructed by stopping, segment assembly, and excavation.

(Problems to be Solved by the Invention) As mentioned above, in the construction of tunnels using conventional segments, the propulsion reaction force of the shield jack cannot be supported while the segments are being assembled. It is impossible to do so, and the amount of advance per 9 days is restricted. Also, when excavating with a mechanical shield, part of the rotational reaction force of the cutter head is supported by the frictional resistance of the contact between the tip of the shield jack rod and the side of the segment. Therefore, it is difficult to support the reaction force of one rotation, and the entire shield machine tends to roll.

(Means and effects for solving the problem) This invention has been made in view of the above points, and by forming a shape in which segments are connected continuously in a spiral shape to form an annular cylinder, & [The shield jack involved in one segment in the I room] cannot be subjected to superhuman force, but the other jacks do not have to stop, thereby allowing the shield machine to continue digging.

Further, by providing a reaction force plate that contacts the contact portion between the segment and the shield jack rod at a certain angle to transmit thrust, it is possible to prevent rolling of the shield machine due to the rotational reaction force of the cutter head.

(Example) Next, embodiments of the present invention will be described based on the drawings.

FIG. 2 is a schematic diagram of propulsion by spiral segments. The spiral segment 6 is a segment (divided body) manufactured in a shape that forms an annular cylinder by being connected continuously with assembly bolts, etc., and as shown in the segment 8, it is assembled at the end of the already assembled segment. The length of the annular cylinder is extended by combining them.

As shown in Figure 1, the shield machine has a rotating cutter head and is equipped with a number of shield jacks l along the circumference of a cylindrical outer shell (shield) in a number that matches the required thrust to reduce the reaction force. It is configured to push the segment 3 through the plate 2.

During excavation, as shown in Fig. 2, the shield machine is pressed against the segment 6 by the shield jack 4 via the reaction plate 5 (see also Fig. 3), which has a constant inclined surface in one circumferential direction. Make the ltl retreat. When assembling the segments, shorten only the portion of the shield jacket related to the new segment 8, connect the segment 8 to the existing segment 6, and erect &II. At this time, the other shield jacks continue to push the segments without stopping, propelling the shield body. When the assembly of the joint 1 of the segment 8 is completed, the shield jack 7 is activated immediately and pushes the segment 8. After completing one stroke of extension in this way, the shield jack is sequentially reduced and a new segment is assembled.

By starting the operation again, it becomes possible to make the shield machine dig without stopping propulsion. In addition, shield jackets obtain propulsion and reaction force from spiral segments.

Although the strokes of each shield jack are different, the automatic control system is used to keep the thrust of each shield jack constant.

(Effect of the invention) The invention is constructed as described in one or more details.

Since the segments are constructed in a spiral, the daily amount increases each time a segment is assembled without stopping the shield.

Further, rolling of the shield machine can be prevented by providing a slope on the reaction force receiver so that the rotational reaction force of the cutter head acts perpendicularly to the contact surface with the segment.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the overall structure of the shield machine and an example of construction of spiral segments, Figure 2 is a schematic diagram of propulsion by spiral segments, Figure 3 is a schematic diagram of an example of the reaction force receiver, and the fourth day FIG. 2 is a schematic diagram of segment propulsion according to conventional technology. l...Shield jack, 2...Reaction force plate. 3...Spiral segment. 4... Shield jack, 5... Reaction force receiver. 6...Existing spiral segment. 7...Shield Jack. 8...Newly established spiral segment. Patent applicant: Komatsu Ltd. Representative (patent attorney): Osamu Matsuzawa Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A segment for primary lining of a tunnel excavated by a shield type tunnel machine, characterized in that an annular cylinder is constructed by continuously connecting segments in a spiral shape.