JPS611799A - Back-filling injection apparatus in shield drilling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial Field of Application The present invention excavates a tunnel using a shield excavator, and excavates a tunnel by using a shield tunneling machine to excavate a tunnel. The present invention relates to a device for injecting backfilling material.

(2) Prior art and its problems One of the conventional methods for injecting this type of backfilling material is to install an injection pipe outside the skin plate of the shield excavator, and to propel the shield excavator through this pipe. A method of simultaneously injecting backfilling material was used.

However, with this method, the piping part protrudes outside the skin plate, which creates frictional resistance when propelling the shield excavator, easily causes rolling and pitching, and furthermore, the muddy water pressurized shield etc. In this case, there were drawbacks such as damage to the water-stop gasket provided around the starting port, making it difficult to shut off water.

Another injection method is to inject a backfilling material through a grout hole provided in the segment.

However, in this method, grout cannot be injected from the segment that has been tensioned until the grout hole passes through the tail of the skin plate, so the grout must be injected from the segment that was tensioned one ring before. There were drawbacks such as complete simultaneous injection not being performed.

(3) Purpose of the Invention Therefore, the present invention improves the drawbacks of the prior art described above, does not affect the propulsion of the shield excavator and water stoppage, and injects backfilling material at the same time as the propulsion of the shield excavator. I can do it. The purpose of this invention is to provide a backfill injection device.

(4) Structure of the Invention The structure of the present invention is to provide a guide groove along the tunnel axis direction on the outer surface of the segment, and an injection pipe with one end attached to the skin plate and provided along the inside of the skin plate. The pipe is slidably arranged in the guide groove of the segment, and a discharge port provided in addition to the injection pipe is opened at the rear of the tail portion of the skin plate.

5) Embodiment of the Invention Figure 1 shows a shield excavation l! equipped with a backfilling injection device.
FIG. 2 is a side sectional view showing a part of A, and a perspective view showing the relationship between the segments and the backfill injection pipe. One end of an injection pipe 3 is fixed to the inside of the skin plate 1 to the shield tunneling machine by a fitting 2, and the injection pipe 3 extends along the inner surface of the skin plate 1 and has a discharge provided at the other end. The outlet 3a opens at a predetermined distance behind the tail portion 1a of the skin plate on which the sealing pad 4.5 is applied. The injection pipe 3 may be a single long pipe, but short pipes are connected by joints 6.7 so that the length can be adjusted according to the length of the skin plate or segment.

On the other hand, segments 8 are sequentially stretched around the outer periphery of tunnel B excavated by shield tunneling machine Δ.
A guide groove 88 is provided on the outside of the tunnel along the tunnel axis direction. The intermediate portion of the injection pipe 3 is slidably fitted into the guide groove 8a. In addition, the seal packing 4 applied to the tail portion of the skin plate 1.
A sealing member 10 is wrapped around a part of the injection pipe 3 that comes into sliding contact with the injection pipe 5 to prevent the injected backfilling material 9 from flowing through the guide groove 8a.

A flexible hose 12 is connected to one end of the injection pipe 3 through a joint 11, so that mortar or other backfill material 9 from an injection pump (not shown) is pumped through the flexible hose.

The injection device of the present invention having the above configuration is attached to the skin plate 1 of the shield excavator A installed in the shaft C in the above manner as shown in FIG. 3, and is towed by the thrust of the shield excavator A. At the same time, the injection pipe 3 is slid in the guide groove 8a of each segment 8 which is sequentially stretched.
Backfilling material 9 is sequentially injected into the gap between the outer periphery of the segment 8 stretched behind the tail portion 1a of the skin plate 1 and the ground through the discharge port 3a.

(6) Effects of the invention As is clear from the above embodiments, the backfilling injection device of the present invention does not allow the injection pipe to protrude to the outside of the skin plate, so it is not possible to perform shield excavation as in the first conventional example. It does not create frictional resistance when propelling the aircraft, does not cause rolling or pitching, and also does not damage the water-stop gasket 13 (see Figure 3) provided around the launch port and reduce water-stop performance. Such drawbacks are eliminated.

Furthermore, since the injection pipe is simultaneously towed by the propulsion of the shield tunneling machine and the discharge port of the injection pipe is always provided at a predetermined distance behind the tail portion, it is subject to the above-mentioned second limitation as in the conventional example. It can be injected simultaneously with the propulsion of the shield tunneling machine.

Furthermore, even if the injection line becomes blocked, the pipe can be easily removed from the segment and cleaned.

It should be noted that the backfilling injection device of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the gist.

For example, the segments can be made of either PC or steel, and the location of the outlet can be changed by changing the length of the pipe.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing a part of a shield excavator equipped with a backfilling injection device according to an embodiment of the present invention, Fig. 2 is a perspective view showing the relationship between segments and injection pipes, and Fig. 3 is a shield It is an explanatory view showing an installation state of an excavation machine. [Explanation of symbols] 1...Skin plate 1a...Tail part 2...
Fittings 3... Injection pipe 3a... Discharge port 4, 5... Seal packing 6.7.11.
...Joint 8...Segment 8a...Guide groove 9...Backfilling material 10...Seal part 12...Flexible hose

Claims (1)

[Claims] A guide groove for piping along the tunnel axis is provided on the outer surface of each segment that is sequentially installed around the inner circumference of the excavated tunnel.
A pipe for injecting backfilling material, one end of which is attached to the skin plate of the shield excavator, is slidably installed in the guide groove along the inside of the skin plate, and a discharge pipe provided at the other end of the injecting pipe is slidably installed in the guide groove along the inside of the skin plate. A backfilling injection device for a shield excavator, characterized in that an outlet is opened at the rear of a tail portion of a skin plate.