JPH0631539B2 - How to add pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention is, for example, for excavating an underground tunnel by a muddy water shield method, in which a pipe is extended without causing muddy water in a mud pipe to flow into the mine. The present invention relates to an improvement of a pipe replenishing method applied to.

<Prior Art> As is well known, in order to excavate a tunnel or the like with a muddy water shield excavator, a telescopic pipe arranged at the rear of the excavator is used to extend the mud pipe for sending and discharging, and the telescopic pipe is fully extended. In that case, disconnect the pipes, shrink the telescopic pipes, add pipes only for the shortened pipes, and dig again. 5 to add this pipe
It is repeated every time about 6 m is excavated.

Since this pipe replenishment work is performed in a state where mud water remains inside the pipe, it is necessary to provide an appropriate closing means for the joint portion so that a large amount of mud water does not flow out from the pipe replenishment portion.
The simplest closing means is to attach a valve to the joint of pipes. Before disconnecting the pipe, the valve is closed, and after adding the pipes, the valve is opened. However, this method requires a large number of valves, and the cost of this valve becomes very large in a long tunnel construction.

In order to enable the addition work of the mud supply pipe without using a large amount of valves, the present applicants have disclosed in JP-A-61-1070.
No. 0 proposes the following connection device for the mud pipe for muddy water shield. This connecting device is provided between the expansion pipe and the pipe on the connecting side, the pipe A connected to the connecting device is once removed, the pipe B is added to the pipe A, and the pipe B is connected to the connecting device again. To do.

Usually, a water stop ball is built in the connection device so as not to hinder the flow of muddy water. Before the pipe A is disconnected from the connection device, the water stop ball is introduced from the inside of the connection device to the end of the pipe A. Is pressed by a pressing means such as pressurized air, and the end portion of the pipe A is closed by using this water blocking ball as a plug. In this closed state, the pipe A is removed from the connecting device, the pipe B is added to the pipe A, and the pipe B is connected to the connecting device. When pressure is applied to the muddy water on the pipe A side in this state, the water blocking ball is pushed by the pressure and passes through the pipe B to be stored again in the connecting device.

<< Problems to be Solved by the Invention >> In the pipe joining method using the above-described water-stop ball type connection device, there were some problems in fitting the water-stop ball and the joining pipe. The water blocking ball is a solid or hollow ball made of rubber or the like, but it must be added to the ball to be able to move inside the tube and to serve as a plug for closing the tube. In addition, the soil contained in the muddy water adheres to the inside of the added pipe, and the frictional resistance between the pipe and the water blocking ball changes depending on the location.

Due to these conditions, when the waterproof ball is added with pressurized air and pushed into the pipe, the pressurized air leaks from the gap between the vault and the pipe and the ball cannot be pushed in. Sometimes I like it. Further, the water blocking balls may not be easily collected in the connecting device. Further, in the case of a hollow ball, air leakage may occur due to scratches, and even if a solid ball is used for a long period of time, its elasticity changes, and the expected performance cannot be stably exhibited for a long period of time.

Further, since the water blocking ball is pushed into the pipe A to close it, it is necessary to release the muddy water corresponding to the pushing of the ball on the opposite side, and a valve, a pipe and a tank for that are required.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a pipe joining method capable of closing the tip of a pipe to be separated at the time of joining more easily and surely than in the past. To do.

<< Means for Solving the Problem >> Therefore, in the present invention, an air bag is built in the conduit of the connecting device to which the replenishment pipe is attached and detached, and the air for supplying and exhausting pressurized air to the air bag is provided. The hose and the air bag are detachably connected, and a valve is provided at the air supply / discharge port of the air bag. In a state in which the connecting device and the pipe A are connected, the compressed air bag is moved from the inside of the connecting device into the end portion of the pipe A, and is then transferred to the air bag through the air hose and the valve. Pressurized air is supplied, and the end portion of the pipe A is closed by the air bag inflated by the pressurized air. Next, the pipe A is removed from the connecting device, and the air hose is removed from the air bag with the valve closed. Next, the air hose is passed through the pipe B and then connected again to the air bag so that one end of the pipe B is connected to the pipe A and the other end of the pipe B is connected to the connecting device. Next, the pressurized air in the air bag is exhausted through the valve and the air hose, and the air bag contracted by the exhaust is drawn from the end portion of the pipe A into the pipe of the connecting device through the pipe B.

<< Operation >> The air bag is moved to the inside of the end portion of the pipe A in a evacuated and contracted state, and pressurized air is supplied at that position to inflate the air bag to completely close the end portion of the pipe A. Further, when the air bag is collected in the connecting device after the pipe B is replenished, the air in the air bag is exhausted to contract the air bag. Move without any obstacles.

<< Example >> FIG. 1 shows an example in which the method of the present invention is applied to a mud pipe for muddy water shield, and FIG. 2 is an enlarged view of a connecting device used in this method.

The connection device 1 has additional pipes 2a, 2 which are successively added.
b, ... Installed between 2i and the expansion tubes 3 and 4. The extension pipe 2a side is connected to the pipe to the vertical shaft via the original valve 5, and the expansion pipes 3 and 4 are connected to the pipe to the face through the front valve 6. If this is a mud pipe, muddy water pressure-fed from the vertical shaft is added and sent to the face of the face through pipes 2a, 2b ... Connection device 1, expansion pipes 3 and 4, and if it is a mud pipe, this The opposite is true.

As shown in FIG. 2, the connecting device 1 has a housing in which a connecting portion 7 on the side of the expansion tubes 3 and 4 and a connecting portion 8 on the side of the extension tubes 2a, 2b, ... A drain pipe 11 having a drain valve 10 is connected to the connecting portion 7 side. The drain pipe 11 is connected to a suitable water receiving tank (not shown).

The housing of the connection device 1 is formed with an oblique hole 12 that is inclined with respect to the main pipe line, and the oblique hole faces the connecting portion 8 side. An air hose 13 is inserted into the slanted hole 12, and a hose guide 14 provided at the base of the slanted hole 12 guides the air hose 13 freely in and out and seals the periphery of the air hose 13.

A joint 15 is provided at the tip of the air hose 13 and is detachably connected to the joint 17 of the air bag 16 described above. The air valve 1 is installed in the joint 17 of the air bag 16.
8 is built in.

The air hose 13 is wound around a reel 19 (FIG. 1) and is connected to a supply / discharge facility (including a compressor, an air supply valve, an exhaust valve, a pressure gauge, etc.) for pressurized air (not shown). When the air hose 13 is connected to the air bag 16 to open the air bag 18 and pressurized air is sent into the air bag 16 through the hose 13, the air bag 16 is greatly expanded, and when the air is exhausted through the air hose 13, the air bag 16 is opened. Contracts small. The air bag 16 is made of, for example, tough rubber, and the air hose 13 has a certain degree of rigidity and is flexible enough to be wound around the reel 19.

The pipe joining method of the present invention using the connecting device 1 configured as described above will be sequentially described.

In the state of FIG. 1 (A), the air bag 16 is contracted, the air hose 13 is pulled to the outside, and the air bag 16 is set in the space of the oblique hole 12. In this state, open the original valve 5 and the destination valve 6 (close the water drain valve 10),
Tunnel excavation proceeds while pumping muddy water from the vertical shaft side to the cutting face side, and along with the excavation, the expansion pipe 4 on the cutting face side moves to the left side in the figure. At this time, the air bag 16 which is shrunk to a small extent and is housed in the oblique hole 12 does not hinder the circulation of the muddy water.

FIG. 1 (B) shows a state in which the expansion and contraction pipes 3 and 4 are fully extended. Here, the tunnel excavation is temporarily interrupted and pipes are added. First, the source valve 5 and the destination valve 6 are closed so that no large pressure is applied to the muddy water between them.
The drain valve 10 is opened to drain a little muddy water in the confined pipe, and this portion is brought to a hydrostatic pressure. Next, the air hose 13 is pushed in from the outside, and the air bag 16 attached to the tip of the air hose 13 is moved from the connecting device 1 to the pipe 2i side.
The air bag 16 is positioned at the tip of the tube 2i. This can be easily controlled by the pushing amount of the hose 13. At this time, the air bag 16 is of course in a contracted state.

Next, pressurized air is sent to the air bag 16 through the air hose 13 and greatly expanded. When the air bag 16 largely expands, the tip portion of the pipe 2i is completely closed and strongly contacts the inner wall of the pipe by the pressure of the supplied air, so that the air bag 16 functions well as a water stopcock.

Next, after opening the water drain valve 10 to remove the muddy water in the expansion tubes 3 and 4, the pipe 2i is disconnected from the connection device 1 and the connection device 1 is moved together with the expansion pipe 3 to the face of the face (expansion pipe 3,
Shorten 4). Then, since the air bag 16 which closes the pipe 2i is visible at the tip of the pipe 2i, the valve 18 of the air bag 16 is closed and then the air hose 13 is attached to the bag 16.
Remove from This state is shown in FIG. 1 (C).

Next, as shown in FIG. 1 (D), an air hose 13 drawn from the connection device 1 side into a pipe 2j to be added to the pipe 2i.
And the tip of the hose 13 is connected to the airbag 16 again. Then, the valve 18 of the air bag 16 is opened after the compressed air having a sufficiently high pressure is fed into the air hose 13 from the compressor.

Next, as shown in FIG. 1 (E), one end of the additional pipe 2j is connected to the pipe 2j and the other end is connected to the connecting device 1. After this, an exhaust valve (not shown) connected to the hose 13 is opened, and the pressurized air in the air bag 16 is exhausted through the hose 13. Then, the air bag 16 contracts slightly, and when the hose 13 is pulled, the air bag 16 easily moves in the pipe 2j and is housed in the oblique hole 12 of the connection device 1. This means that pipe addition work has been completed, and by closing the water drain valve 10 and opening the main valve 5 and the front valve 6, muddy water can be sent from the vertical shaft side to the face side.

<< Effects of the Invention >> As described in detail above, according to the pipe joining method of the present invention, the air bag in the contracted state is moved from the connecting device side to the tip portion of the joining pipe, In that state, pressurized air is sent to the air bag to inflate it, and the inflated air bag can completely close the tube, so there is no delicate instability element as in the past and the effect as a water stopcock is perfect. Yes, and the installation work of the stopper is extremely easy. Further, since the work of removing the plug after connecting the pipes is also performed with the air in the air bag being deflated and contracted to a small extent, the air bag can be reliably collected in the connecting device.

[Brief description of drawings]

FIG. 1 is a diagram showing working steps of a pipe connecting method according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a connecting device used in the same embodiment. 1 ... Connection device 2a, 2b, to 2i, 2j ... Extension pipe 3, 4 ... Expansion pipe, 5 ... Original valve 6 ... Destination valve, 7 ... Connection part 8 ... Connection part, 10 ... … Drainage valve 11 …… Drainage pipe, 12 …… Slanted hole 13 …… Air hose, 14 …… Hose guide 15 …… Fitting, 16 …… Air bag 17 …… Fitting, 18 …… Air bag 19 …… reel

Claims (1)

[Claims] 1. A method of once removing a pipe A connected to a connecting device, adding a pipe B to the pipe A, and connecting the pipe B again to the connecting device; Built-in air bag,
An air hose for supplying and exhausting pressurized air to and from the air bag is detachably connected to the air bag, and a valve is provided at the air supply / exhaust port of the air bag; In the connected state, the compressed air bag is moved from the inside of the connecting device into the end of the pipe A, and then pressurized air is supplied to the air bag through the air hose and the valve to apply the pressure. The end of the pipe A is closed by the air bag inflated by compressed air; next, the pipe A is removed from the connecting device, and the air hose is removed from the air bag with the valve closed; , The air hose is passed through the pipe B, and then connected to the air bag again so that one end of the pipe B is connected to the pipe A and the other end of the pipe B is connected. Next, the pressurized air in the air bag is exhausted through the valve and the air hose, and the air bag contracted by the exhaust is passed from the end of the pipe A through the pipe B to the connection device. Retracting into the conduit; A method for adding a pipe, characterized in that