JPS6327519B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for protecting a tail seal of a shield tunneling machine.

In recent years, shield excavation methods have made great progress, but the trend is to reduce the high-pressure work performed by workers as much as possible, such as the limited pressure air method, muddy water shield method, and earth pressure balance method.

By the way, the tail seal is a particular problem in each of the above construction methods, and
This has become a major problem that affects construction in the case of deep shields exceeding 100 meters.

In the shield construction method, for example, the mud water shield construction method, as is well known, a tail seal made of rubber material or the like is interposed between the skin plate of the shield excavator and the segment built during excavation, and the seal between the skin plate and the segment is This prevents muddy water mixed with sand and gravel from entering through the gaps. However, in the past, no means had been taken to protect the tail seal made of rubber, etc., so sand and gravel could get stuck in the tail seal, damaging it when the shield excavator was moved during excavation, and reducing its lifespan. , there were inconveniences such as a decrease in the water-stopping effect. This problem was especially serious in the case of deep shielding as described above.

In the present invention, a water-resistant, pressure-resistant, and flexible cylindrical sheet such as a synthetic resin sheet or a rubber sheet is wrapped around the main body of a shield tunneling machine, and the cylindrical sheet is wrapped as the shield tunneling machine moves forward. send it backwards,
The cylindrical sheet covers the skin plate and segment of the shield tunneling machine from the outer periphery to protect the tail seal, thereby solving the above-mentioned conventional problems.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the tail seal protection method of the present invention will be described with reference to the drawings.

The shield excavator, which is indicated by 1 as a whole, includes a cylindrical skin plate 2, a rotary excavation blade 3, a mud feeding pipe 4,
Sludge removal pipe 5, mud feeding pipe 4, and mud removal pipe 5
It is equipped with various valves 6, pumps 7, shield jacks 8, etc. installed in the pump. Mud water is sent to the mud chamber 9 by the mud feeding pipe 4, excavated waste is removed together with the mud by the mud draining pipe 5, and as the excavation progresses, the shield excavator 1 is advanced by the shield jack 8 and the segment 11 is erected. Although it is omitted in FIG. 1, a sealing member made of rubber or the like is inserted between the skin plate 2 and the segments 11 to prevent muddy water containing sand and gravel from flowing through the gap between the skin plate 2 and the segments 11. Intrusion into the machine room 10 is prevented.

As mentioned above, in the past, there was no means to protect the seal member interposed between the scan plate and the segment, that is, the tail seal, so sand and gravel could get caught in the tail seal, causing movement of the shield excavator as it excavated. During this process, the tail seal was damaged by the gravel, resulting in a shortened tail seal life and reduced water-stopping effect.

Therefore, in the present invention, a water-resistant, pressure-resistant, and flexible cylindrical sheet 12 such as a synthetic resin sheet or a rubber sheet is wrapped around the shield tunneling machine main body 1, and as the shield tunneling machine 1 moves forward, Cylindrical sheet 1
2 is sent rearward, and the cylindrical sheet 12 covers the skin plate 2 and the segment 11 of the shield excavator 1 from the outer periphery to protect the tail seal. At this time, the sent-out cylindrical sheet 12 comes into close contact with the skin plate 2 and the segments 12 due to water pressure and earth pressure.

As shown in FIG. 2, the rolled cylindrical sheet 12 is placed in a box 13 provided in the main body 1 of the shield tunneling machine, and a seal 14 made of rubber or synthetic resin is applied to the outlet of the box 13. Prevent sand and gravel from entering inside.

Further, as shown in FIG. 3, during excavation, the ring-shaped holding member 15 may be pressed against the cylindrical sheet 12 by a jack 14 or the like to prevent sand and gravel from entering.

Further, the position at which the cylindrical sheet 12 is wound is not limited to the position shown in the drawings, and may be provided within the muddy water chamber 9, for example.

As explained above, according to the present invention, the tail seal is covered with a water-resistant, pressure-resistant, and flexible cylindrical sheet such as a synthetic resin sheet or a rubber sheet. The tail seal will not be damaged by the sand and gravel that has become trapped during the movement of the shield excavator, and can provide a stable sealing effect over a long period of time.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a shield tunneling machine in which the tail seal protection method of the present invention is implemented, and FIGS. 2 and 3 are cross-sectional views showing the exit portion of the cylindrical sheet. It is a diagram. 1... Shield tunneling machine, 2... Skin plate, 11... Segment, 12... Cylindrical sheet.

Claims (1)

[Claims] 1. In a method for protecting a tail seal interposed between a skin plate and a segment of a shield tunneling machine, a synthetic resin sheet,
A water-resistant, pressure-resistant, and flexible cylindrical sheet such as a rubber sheet is wrapped, and as the shield tunneling machine moves forward, the cylindrical sheet is sent backward, and the cylindrical sheet is used to cover the skin plate of the tunneling machine. and a method for protecting a tail seal in a shield excavation method, characterized in that the tail seal is protected by covering the segment from the outer periphery.