JPH0231199B2 - DOROMIZUKAATSUSHIKISHIIRUDOKOHONIOKERUSOHAIDEISUIKANNOTSUGITASHIHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for adding mud water pipes in a mud water pressurized shield method.

The shield method is known as one of the excavation methods for constructing tunnels in soft ground.Recently, a method called the mud water pressure shield method has been developed to supply high-pressure mud water to the tunnel face to prevent collapse of the face and spring water. A method of excavating tunnels while trying to prevent this is widely used. In this way, the mud water pressurized shield construction method requires a mud water supply pipe and a discharge pipe for discharging the earth and sand excavated at the face in the form of slurry. It is about the addition method.

The mud water pressure shield construction method will be explained in more detail with reference to FIG. 1. A cutting machine 3 is installed on a face 2 of a tunnel 1, and the excavating machine 3 is attached to a shield 4. And slurry water pipe 5
and a mud drainage pipe 6 extend from the wellhead 7 toward the excavator 3. The mud water pipe 5 is connected to a mud water reservoir 8 in order to obtain the necessary head, and valves 9 are provided at required locations, and a telescopic pipe 10 is interposed in a part of the pipe. A valve 9 is also provided in the mud discharge pipe 6, and a telescopic pipe 10 is also interposed at substantially the same position in the mud water pipe from the face 2. The drain pipe 6 extends outward from the wellhead 7. Sediment is then separated externally, and the mud is recycled for reuse if necessary. Note that the reference numeral 11 in the figure indicates a segment or lining block of the tunnel 1.

By the way, when a tunnel is excavated by the above-mentioned device, when the face 2 moves forward, the mud water pipes 5 and 6
It is also necessary to advance the telescopic tube 1.
This can be dealt with by increasing the number by 0.
When the excavator 3 moves forward beyond the expansion limit of the expandable pipe, a new pipe (not shown) is connected to the mud water supply/discharge pipes 5 and 6. By the way, in the past, muddy water inside the pipe was drained into the tunnel (tunnel) in order to remove the flange part when connecting or adding the pipe.
The disadvantage was that it leaked into the public domain. In other words, conventionally, when adding pipes, valves installed at intervals of 100 to 200 meters were closed and new pipes were added. As is clear from the calculation of
3 m ³ for 100 m of 8-inch pipe, 5 m ³ for 100 m of 10-inch pipe
Therefore, if an 8-inch pipe and a 10-inch pipe were installed as mud water pipes, approximately 3 + 5 = 8 m ³ of mud water would flow into the mine to add 5.5 m of regular length steel pipe. It required a lot of labor and time to treat this muddy water.

The present inventor has studied various methods for connecting new pipes while preventing such muddy water from flowing out. For example, as shown in FIG. 2, when inserting the flexible tube 12 near the expandable tube 10 and adding it, slide the flexible tube 12 along the slide plate (pipe switching device) 13 to the position indicated by the solid line. and then push plunger 1 from the end.
4 was inserted, the plunger 14 was forced to the C position of the pipe A with the calculated amount of water, the joint 15 was removed, and a new pipe (not shown) was connected to this joint. In the figure, reference numeral 16 indicates a water tank, and 17 indicates a water pipe. Although this method has achieved its purpose in terms of preventing muddy water from flowing into the mine, it has been found to require a large amount of expense and lack practicality, and some countermeasures have been desired.

The present invention has been proposed to meet the above-mentioned needs, and can provide a method for adding pipes that is low cost and does not cause muddy water to flow out.

According to the present invention, a connecting pipe body provided with the socket with a plug at both ends is connected between at least one side of the upstream side or the downstream side of the expandable pipe and the unit pipe body provided with the socket with a plug. When connecting a flexible hose through a vector joint and adding a new pipe, first insert a flexible bag from the socket of the connecting pipe body and unit pipe body on both sides of the vector joint. and inflate the bag to close both tubes, then remove the vector joint and bend the flexible hose to create a new tube with the plugged socket as a new unit tube. There is obtained a method for connecting a mud water supply/discharge pipe in a mud water pressure shield construction method, which is characterized in that the flexible bag is interposed between the connecting pipe body and the unit pipe body, and then the flexible bag is taken out.

As described above, according to the present invention, since the pipe is closed with a flexible bag and a new pipe is added, there is no leakage of muddy water, and the pipe can be added at an extremely low cost.

Embodiments of the present invention will be explained below with reference to FIGS. 3 to 9. Note that since the mud water pipes are structurally the same, the mud water pipes will be collectively described below as pipes.

FIG. 3 shows an example of a pipe line used for carrying out the present invention, and a telescopic pipe 21 is interposed in the pipe 20 on the face side. In addition, there are gate valves 22 on the face side and under the shaft.
23 are provided respectively. The telescopic tube 21 is
As mentioned above, it extends as the face moves forward, and is therefore supported by the truck 24, which runs on the rail R laid in the tunnel.

The pipe 20 consists of a plurality of connected unit pipe bodies 25, each of which is interconnected by a vector joint 26, and the pipe 20 as a whole is made up of a plurality of connected unit pipe bodies 25.
It constitutes 0. In addition, the unit pipe body 25 is provided with the figures 4 and 5 on the vector joint 26 side.
As shown in the figure, a socket 27 with a plug is provided. Connecting tube bodies 28 and 29, which are slightly shorter than the unit tube body 25, are provided on the tube 20, and a flexible hose 30 is interposed between these tube bodies 28 and 29. The connecting tubes 28 and 29 are also provided with a socket 27 with a plug.

Next, a method for adding pipes will be explained with reference to FIGS. 6 to 9. Note that these figures are from the third
It is an enlarged view of the main part shown in the figure.

FIG. 6 shows a state in which the face has not advanced and the telescopic tube 21 is in a contracted state. It is clear that there is no need to add new pipe.

As the excavation of the face progresses, for example, 6R (90cm x 6R =
5.4m) When excavating, the telescopic pipe 21 will stretch to the limit, but in this situation it will be necessary to add more pipes (as shown in Figure 7). After closing the gate valves 22 and 23 to reduce the pressure inside the pipe 20, the connection pipe body 2 is closed.
9 and the plug of the socket 27 of the unit pipe body 25 adjacent thereto. Then, flexible bags 31, 31 are inserted through the sockets 27, 27, and fluid, such as air, is blown into the bags to close the tube (FIG. 8). Next, flexible bags 31, 31
Remove the Victory Joint 26 which is caught between the It is clear that muddy water no longer flows out of the joint.

As shown in Figure 9, cut off the tube and create a new tube 3.
Add 5. For this addition, the flexible hose 30 is bent as shown by the chain line to create a new length of the tube 35. Since the volume remains unchanged even when the flexible hose is bent, it is clear that the hydraulic pressure within the hose or within the telescopic tube 21 remains unchanged. If necessary, before contracting the telescopic tube 21, the connection tube 28 and the socket 27 of the new tube 35 are connected to each other by the sunny hose 34 to establish fluid communication.

Finally, the fluid in the flexible bags 31, 31 is drained. Then, the flexible hose 30 is shown as a solid line (9th
Figure) Stretch and contract the telescopic tube 21. The portion whose volume has become smaller due to shrinkage is moved into the new tube 35. Note that it also moves through the sunny hose 34.
The flexible bags 31, 31 are taken out and plugged.
It is clear that the new pipe 35 will be a unit pipe body,
Continue adding the following in the same way.

As described in detail above, according to the present invention, it is possible to achieve an extremely low cost by simply providing a socket with a plug in the unit pipe body or the connecting pipe body, which is the basis of the pipe, and inserting a flexible hose. The pipes can be connected using flexible bags such as rubber balloons.
It is easy to work with and can completely prevent muddy water from flowing out.

[Brief explanation of drawings]

Figure 1 is a diagram showing the concept of the muddy water pressurized shield method, Figure 2 is a diagram showing an example of pipe addition, Figure 3 is an enlarged partial view to explain the method of the present invention, and Figure 4 is a unit. An enlarged detailed view of the tube body and the socket part, FIG. 5 is a diagram showing the flexible bag in an inflated state, and FIGS. 6, 7, 8, and 9 explain the working order of the present invention. FIG. 4 is a further enlarged view of the main part shown in FIG. 3. 1... Tunnel, 2... Face, 5, 6... Mud water pipe, 21... Expandable pipe, 25... Unit pipe body, 26... Victory joint, 27... Socket with plug, 27, 28... Connection pipe body , 30...Flexible hose, 31...Flexible bag.

Claims (1)

[Claims] 1. Between at least one upstream or downstream side of the telescoping pipe and a unit pipe body equipped with a socket with a plug, a flexible hose is connected at both ends with a connecting pipe body equipped with the socket with a plug. When connecting a new pipe by connecting it through a vector joint, first insert a flexible bag into the socket of the connecting pipe body and the unit pipe body on both sides of the vector joint, and remove the bag. The valve joint is then removed, and the flexible hose is bent to connect a new tube that will become a new unit tube body equipped with the plug socket to the connecting tube. 1. A method for connecting a mud water pipe in a mud water pressurized shield construction method, characterized by interposing the flexible bag between the body and the unit pipe body, and then taking out the flexible bag.