JP3318693B2 - Muddy water outflow prevention device when piping is extended - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, muddy water discharge during pipe stretching suitable for preventing the outflow of muddy water at the time of elongation of a mud pipe and a drainage pipe accompanying the progress of excavation during muddy water shield construction. It relates to a prevention device.

[0002]

2. Description of the Related Art Generally, in muddy water shield construction,
As the excavation progresses, it is necessary to extend a mud pipe for sending muddy water to the face from the back of the excavation direction and a mud pipe for discharging muddy water and excavated soil from the face to the rear. Conventionally, when a pipe is extended, an on-off valve is provided on each of the feed and discharge pipes, the on-off valve is closed, then a connection portion of the feed and discharge pipe is disconnected, and a fixed length pipe is inserted and connected thereto. Was like that. However, in such a method, a large amount of muddy water in the pipe flows out into the shield premises when the connection part of the pipe is opened.
No. 9 proposed a device for preventing muddy water from flowing out when a pipe is extended.

[0003] Such a muddy water outflow prevention device is installed on a pipeline of a sending and discharging muddy pipe, and each of the pipelines is sealed by a gate portion provided in the muddy water outflow prevention device to prevent the outflow of muddy water in the pipeline. It has a structure that can be prevented. Then, the pipe is cut off in the vicinity of the muddy water outflow prevention device, and a certain length of pipe is newly inserted and connected therebetween.

[0004]

However, the conventional muddy water spill prevention device as described above has the following problems. First, when the feed / drainage pipe is extended, there may be a difference in the overall length of the feed / drainage pipe due to bending of the excavation path or accumulation of errors in the pipe length. is there. Then, when the feed / drain pipe is extended and then connected to the muddy water outflow prevention device again, a problem may occur in which connection at the same location becomes impossible. Also,
When the pipeline is sealed on both sides of the gate portion, when disconnecting the pipeline, if there is residual pressure in the pipeline, muddy water is blown out, and the surrounding work area is contaminated. The present invention has been made in view of the above points, regardless of the difference in length of a mud pipe and a drain pipe, it is possible to smoothly perform pipe extension work, It is an object of the present invention to provide a muddy water outflow prevention device at the time of extending a pipe, which can minimize contamination of the pipe.

[0005]

The invention according to claim 1 is
The sludge pipe is provided in a pipeline between a sludge pipe for sending sludge from one side to the other side and a sludge pipe for discharging sludge from the other side to one side. in mud outflow prevention device for use when drawing the tube and the waste sludge line, the Okudoro side sealing mechanism that seals Okudoro of the Okudoro tube to seal the waste sludge of the waste sludge pipe discharge And a mud-side sealing mechanism, wherein the mud-side sealing mechanism corresponds to the mud-sending-side sealing mechanism.
And being the movable structure in the axial direction, the
On the rear end side of the mud sending side sealing mechanism, between the mud sending pipe
The flexible tube that can be extended and contracted
Wherein the sludge-side sealing mechanism comprises a base in a pipe of the sludge pipe, and a gate portion comprising a slider slidably attached to the base so as to be slidable in one direction. One side of the conduit is connected to the slider by opening to the mating surface side, and the slider is provided with a conduit on the other side and an accommodation chamber accommodating a sealing member therein, respectively. provided apart a predetermined dimension along the opening vital the one direction on the side, said the conduits connected one side of the foundation provided with a closable pressure relief valve Rutotomoni, the one
At the rear end side of the pipeline on the side of
And a flexible tube that is expandable, contractible, and bendable .

According to a second aspect of the present invention, there is provided a mud pipe for feeding mud from one side to the other side and a mud pipe for discharging mud from the other side to one side. A muddy water outflow prevention device that is provided in a pipe line and is used when extending the mud feeding pipe and the mud discharging pipe, wherein a mud feeding side sealing mechanism for sealing mud feeding in the mud feeding pipe; A sludge-side sealing mechanism for sealing the sludge in the sludge pipe, and the sludge-side sealing mechanism is movable in the axial direction with respect to the sludge-side sealing mechanism. Wherein the sludge-side sealing mechanism comprises a base in the conduit of the sludge pipe, and a gate part comprising a slider slidably mounted on the base so as to be slidable in one direction, A conduit on one side is connected to the base by opening to the mating surface side with the slider, and a conduit on the other side is connected to the slider. A storage chamber containing a sealing member therein is provided on the mating surface side with the base, and is provided at a predetermined distance in the one direction, and is connected to the base on one side. Is provided with a pressure release valve that can be opened and closed, wherein the muddy side sealing mechanism is connected to a muddy side connecting pipe connected to the other side of the muddy side pipe,
And a housing tube disposed above the Okudoro side connecting pipe, the rear end side of the Okudoro side connecting pipe is bent upward, coupled with the opening on the lower surface of the rear end of the housing tube It is characterized by being.

[0007] The invention according to claim 3 is claim 1 or claim 1.
Item 3. The muddy water outflow prevention device at the time of pipe extension according to Item 2 , wherein the pressure release valve is connected to a drain container provided in the muddy water outflow prevention device.

[0008]

According to the first and second aspects of the present invention, the muddy water discharge prevention device includes a mud- discharge-side sealing mechanism that is connected to the mud- feeding-side sealing mechanism.
On the other hand, it is configured to be movable in the axial direction. Thereby, the muddy passage in the muddy pipe is sealed by the muddy-side sealing mechanism, and the muddy waste in the muddy pipe is sealed by the muddy-side sealing mechanism. When disconnecting the pipe and inserting a new pipe of a fixed length, even if the lengths of the mud pipe and the mud pipe are different, the mud-side sealing mechanism and mud-side sealing mechanism are By making the relative movement, it is possible to easily position and connect each sealing mechanism, the mud feeding pipe and the mud discharging pipe.

Also, a muddy discharge side sealing mechanism of the muddy water outflow prevention device.
The part was configured to include a pressure relief valve on one side of the conduit connected to the base of the gate part. Thus, keep seals the waste sludge of waste sludge pipe hydro side sealing mechanism, when disconnecting the Haidorokan by the depressurization in the line by opening the depressurization valve, It is possible to prevent muddy water from blowing out of the pipeline.

According to the third aspect of the present invention, the pressure relief valve is connected to the drain container provided in the muddy water outflow prevention device. Thereby, when depressurizing the inside of the pipeline, the muddy water in the pipeline can be drained to the drain container without being scattered around.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 and FIG. 2 show an example of a muddy water outflow prevention device according to the present invention at the time of pipe extension. As shown in FIG. 1 and FIG. 2, a muddy water spill prevention device 1 includes a mud pipe 2 for sending muddy water to a muddy shield type excavator (not shown) (left side in the figure), and a kneaded excavated soil mixed with muddy water ( (Right side in the figure)
It is installed in the middle of the pipeline with the exhaust pipe 3 that discharges the wastewater.

The muddy water spill prevention device 1 is installed on a rail 4 laid in a tunnel premises and has a main body 5.
And a mud-side sealing mechanism 6 and a mud-side sealing mechanism 7.

As shown in FIG. 1, the main body 5 is provided with a gantry 9 mounted on a trolley 8 which can run on the rail 4.
Above, a water tank 10 for storing fresh water (see FIG. 2) and a control device 11 for controlling the entire muddy water outflow prevention device 1 are provided. A bottomed drain container 12 is provided below the gantry 9.

The mud-feeding-side sealing mechanism 6 is mounted on a carriage 14 having a U-shape in plan view, which can run on the rail 4 and is connected to the carriage 8 of the main body 5 via a connecting rod 13. Mud feeding side connecting pipe 15 connected to mud feeding pipe 2 on the face side (left side in the figure)
And the storage pipe 1 disposed above the mud-feeding side connection pipe 15.
6 is provided.

An opening / closing valve 15a is provided at the front end (left side in the figure) of the mud feeding side connection pipe 15. Further, the rear end (right side in the figure) of the mud feeding side connection pipe 15 is bent upward, and is opened and connected to the lower surface of the rear end 16 a of the storage pipe 16. At the opening where the mud feeding side connecting pipe 15 faces the storage pipe 16, a slug is formed. A water supply pipe 17a for supplying fresh water from the water tank 10 (see FIG. 2) is connected to the front end 16b of the storage pipe 16. The water supply pipe 17a is provided with a switching valve 18. By switching this, the water in the storage pipe 16 can be drained into the drain container 12 through the water supply pipe 17a and the drain pipe 19. I have. Further, the muddy water sealing member 20 is stored in the storage pipe 16. This muddy water sealing member 20
Is a cylindrical member having an outer diameter slightly larger than the inner diameter of the storage tube 16 and the rear side mud feed tube 2, and is formed of a semi-rigid material having elasticity, for example, silicon rubber, hard sponge, or the like. Further, a pressure release valve 21 is provided at the rear end 16a of the storage tube 16. This pressure relief valve 2
1 is connected to the drain container 12 via a hose (not shown). The mud feed pipe 2 is connected to the rear end 16a side of the storage pipe 16 of the mud feed side sealing mechanism 6 having such a configuration via a flexible pipe 22 which can be expanded and contracted and a main valve 23. Have been.

In the mud feed side sealing mechanism 6, the storage pipe 1 is connected from the water tank 10 (see FIG. 2) via a water supply pipe 17a.
When the fresh water is fed into the inside 6, the muddy water sealing member 20 in the storage tube 16 is pressed when the water pressure becomes equal to or higher than a certain value, and slides toward the rear mud feed tube 2. I have.
The muddy water sealing member 20 separates fresh water from muddy water.

On the other hand, the sludge-side sealing mechanism 7 has a configuration in which a gate 26 is mounted on a carriage 25 that can run on the rail 4. The gate unit 26 is positioned so that the bogie 25 is positioned in a vertical plane perpendicular to the direction in which the exhaust pipe 3 extends.
A base 27 fixed above and a slider 2 which is vertically moved by a hydraulic cylinder 28 in a state facing the base 27.
9. At the upper end of this base 27,
A stopper cylinder 30 provided with a stopper (not shown) that moves forward and backward in the horizontal direction toward the slider 29 is provided.
9 is fixed at the rising end.

A rear connecting pipe (one side pipe) extending rearward (rightward in the figure) is provided at the center of the base 27.
31 is connected to the slider 29 by opening to the mating surface side with the slider 29. The rear connection pipe 31 is provided with an opening / closing valve 32 that opens and closes by hydraulic drive and a pressure release valve 33. The pressure relief valve 33 is connected to the drain container 12 via a hose (not shown). The sludge pipe 3 is connected to the rear end of the rear connection pipe 31 via a flexible pipe 34 that can be expanded and contracted and a main valve 35 that can be opened and closed.

When the slider 29 is located at the rising end, the slider 29 at a position facing the rear connection pipe 31 of the base 27 has a front connection pipe (the other side pipe) 36.
Are opened and connected to the mating surface side with the base 27. When the slider 29 is located at the lower end, the storage pipe (storage chamber) 37 is opened on the mating surface side of the base 27 with the slider 29 at the position facing the rear connection pipe 31 of the base 27. Are linked.

The front connecting pipe 36 is connected to a connecting pipe 39 via a flexible pipe 38 which can be expanded and contracted at an intermediate portion. The connecting pipe 39 is supported by the carriage 8 of the main body 5 and is connected to the sludge pipe 3 on the face side. Also,
Base end 4 of hydraulic cylinder 40 that can be expanded and contracted by hydraulic drive
0a is rotatably supported by the carriage 8 in the vertical plane, and its front end portion 40b is fixed to the front connecting pipe 36 so as to be rotatable in the vertical plane. Thereby, the hydraulic cylinder 4
0 is extended and retracted, the cart 25 is, for example, 1000 m
It is configured to move back and forth with a stroke of m. At this time, the carriage 25 moves without interfering below the carriage 14 of the mud feeding side sealing mechanism 6.

The storage tube 37 has the same structure as that of the storage tube 16 of the mud-feeding-side sealing mechanism 6, and has a water tank 10 at its front end.
A water supply pipe 17b for supplying fresh water from (see FIG. 2) is connected. The water supply pipe 17b is connected to the switching valve 18. By switching the water supply pipe 17b, the water in the storage pipe 37 can be drained into the drain container 12 via the water supply pipe 17b and the drain pipe 19. I have. A muddy water sealing member (sealing member) 41 is provided in the storage pipe 37.
Is stored. This muddy water sealing member 41 is
7, a cylindrical, semi-rigid material having an outer diameter slightly larger than the inner diameter of the rear connecting pipe 31 and the rear side drain pipe 3 and made of an elastic, semi-rigid material, such as silicon rubber, hard sponge, or the like. .

The valves, hydraulic cylinders and the like of the muddy water spill prevention device 1 having the above-mentioned configuration are all controlled by the control device 11 to automatically control the opening / closing, expansion / contraction and the like.

Next, a method for extending the mud feeding pipe 2 and the mud discharging pipe 3 using the above-described muddy water outflow prevention device 1 will be described. When extending the sludge pipe 2 and the sludge pipe 3, first,
The main valve (not shown) on the mud pipe 2 and the main valve (not shown) on the mud pipe 3 are closed. Thereby, the muddy water spill prevention device 1
Stop applying the mud feeding pressure and the mud pressure to

(Sludging-Side Sealing Step) Next, fresh water is fed from the water tank 10 (see FIG. 2) to the storage pipe 16 of the mud-feeding-side sealing mechanism 6 via the water supply pipe 17a. Then, the muddy water sealing member 20 in the storage pipe 16 is moved rearward (to the right in the drawing) by the water pressure. Then, when the muddy water sealing member 20 passes through the flexible pipe 22, the supply of fresh water is stopped. The amount of movement of the muddy water sealing member 20 can be detected by a flow meter (not shown) provided in the water supply pipe 17a. Subsequently, after the main valve 23 is closed, the pressure is released from the pressure release valve 21 on the front side (fresh water side) of the muddy water sealing member 20. At this time, the water discharged from the pressure release valve 21 passes through a hose (not shown),
Drained to drain container 12. Thus, the sealing of the mud pipe 2 is completed by the muddy water sealing member 20.

(Sludging-side sealing step) In parallel with the above-mentioned mud-feeding-side sealing step, a sealing operation of the sludge pipe 3 is performed. First, after the on-off valve 32 is closed, the pressure release valve 33 is opened to release the pressure on the front side (fresh water side) of the muddy water sealing member 41. At this time, the water discharged from the pressure release valve 33 is drained to the drain container 12 via a hose (not shown).
Next, the stopper of the stopper cylinder 30 (not shown)
And the fixing of the slider 29 of the gate portion 26 is released. Then, the hydraulic cylinder 28 is operated to lower the slider 29 of the gate 26 to the lower end. Then, in the gate section 26, the storage tube 37 and the rear connection tube 31 face each other, and the front connection tube 36 faces the base 27 (the state indicated by the two-dot chain line in FIG. 1). In this state,
The mud drain pipe 3 forward (left side in the figure) of the front connection pipe 36 is sealed by the base 27. At this time, the front connecting pipe 36 has a flexible pipe 38, and the hydraulic cylinder 40 has a base end 40a and a front end 4a.
Since the sliders 0b are rotatably supported, the slider 29 can be lowered without any trouble. Also,
Since the pressure is released from the pressure release valve 33, the slider 29 slides easily. Next, after the on-off valve 32 is opened, the water tank 10 (see FIG. 2) is inserted into the storage pipe 37.
Supplies fresh water through a water supply pipe 17b. Then, the muddy water sealing member 41 in the storage pipe 37 moves rearward (to the right in the drawing) by the water pressure. Then, when the muddy water sealing member 41 passes through the flexible pipe 34, the supply of fresh water is stopped, and the main valve 35 is closed. The amount of movement of the muddy water sealing member 41 can be detected by a flow meter (not shown) provided in the water supply pipe 17b. Subsequently, after the on-off valve 32 is closed, the pressure release valve 3
3 is opened, and the front side (the fresh water side) of the muddy water sealing member 41 is opened.
Pressure relief. Thus, the sealing of the exhaust pipe 3 is completed.

(Separation step of mud pipe 2 and mud pipe 3) Next, the flexible pipe 22 on the mud pipe 2 side and the mud pipe 3
Side flexible tubes 34 are removed on the rear side, respectively. Then, the entire muddy water outflow prevention device 1 is moved forward (to the left in the figure) by the length of a pipe (not shown) to be inserted.

(Pipe Insertion and Connection Step) Next, pipes (not shown) each having a certain length are inserted and connected to the mud feeding pipe 2 and the drain pipe 3.

(Connecting Step of Mud Pipe 2 and Discharge Pipe 3) Subsequently, the flexible pipes 22 and 34 are connected to the inserted pipes (not shown). At this time, if the lengths (connection points) of the mud feeding pipe 2 and the mud discharging pipe 3 are different, the hydraulic cylinder 40 of the mud discharging side sealing mechanism 7 is correspondingly changed.
Is expanded and contracted, and the position of the rear end of the storage pipe 16 and the rear end of the rear connection pipe 31 are adjusted in accordance with the mud feeding pipe 2 and the mud discharging pipe 3. This makes it possible to easily position and connect the mud pipe 2, the mud pipe 3 and the muddy water outflow prevention device 1.
In addition, the flexible pipes 22 and 34 can be made straight without being bent so as not to obstruct the pipes.

(Sludging Side Seal Release Step) First, after the pressure release valve 21 is closed, the main valve 23 is opened. Then, the main valve (not shown) on the mud feeding pipe 2 side is opened, and the muddy water sealing member 20 is moved toward the storage pipe 16 by the mud feeding pressure. At this time, the muddy water sealing member 20 is placed at a predetermined position in the storage pipe 16.
Is detected by a sensor (not shown) provided in the storage tube 16. Thus, the release of the sealing of the mud feeding pipe 2 is completed.

(Sludging-side sealing release step) In parallel with the mud-feeding-side sealing release step, the sealing operation is also performed on the sludge discharging pipe 3 side. First, after closing the pressure relief valve 33 and opening the on-off valve 32,
The main valve 35 is opened and moved toward the storage pipe 37 by mud pressure. Then, the muddy water sealing member 41 is connected to the storage pipe 37.
After the sensor (not shown) detects that the predetermined position in the inside has been reached, the on-off valve 32 is closed and the pressure release valve 33 is opened to release the pressure of the gate section 26. Next, the hydraulic cylinder 28 is driven to move the slider 2 of the gate 26.
9 is raised to the rising edge. Then, the stopper (not shown) of the stopper cylinder 30 is projected so that the slider 29
Is fixed. In this state, the front connection pipe 36 faces the rear connection pipe 31 (the state shown by the solid line in FIG. 1). Subsequently, the depressurizing valve 33 is closed, the on-off valve 32 is opened, and the original valve (not shown) is opened, and the release of the sealing of the exhaust pipe 3 is completed.

With the above, the extension work of the pipes of both the mud feed pipe 2 and the drain pipe 3 is completed. Thereafter, every time the excavation advances by a certain size, the mud feeding pipe 2 and the mud discharging pipe 3 are extended in the same manner as described above.

As described above, in the muddy water spill prevention device 1, the drainage-side sealing mechanism 7 is configured to be movable in the axial direction by the hydraulic cylinder 40. As a result, the sludge-side sealing mechanism 7 and the sludge-side sealing mechanism 6 can be moved relative to each other. The position adjustment can be performed by expanding and contracting the hydraulic cylinder 40 of the mud-side sealing mechanism 7. As a result, it is possible to easily position and connect the mud sending pipe 2, the mud discharging pipe 3 and the muddy water outflow prevention device 1. In addition, the flexible pipes 22 and 34 can be made straight without being bent so as not to obstruct the pipes. Further, depressurizing valves 21 and 33 are provided in the mud feeding side sealing mechanism 6 and the mud discharging side sealing mechanism 7, respectively. Thus, when the mud pipe 2 and the drain pipe 3 are cut off, by opening the depressurizing valves 21 and 33 to depressurize the pipeline, it is possible to prevent the muddy water from blowing out of the pipeline. . As a result, it is possible to maintain a clean working environment without polluting the surrounding working area. Further, in the sludge-side sealing mechanism 7, the pressure release valve 33 is provided.
By releasing the pressure of the gate portion 26, the slider 29 can be easily slid. Moreover, the pressure relief valves 21 and 33 are connected to the drain container 12 via a hose (not shown).
Thereby, even when depressurizing, the water in the pipeline is drained to the drain container 12 without being scattered to the surroundings, so that the above-mentioned effect can be further remarkable. Furthermore, each valve of the muddy water spill prevention device 1 is configured to be automatically opened and closed by the control device 11. This saves the trouble of opening and closing a large number of valves each time the pipe is extended, and also prevents accidents such as water blowing due to erroneous opening and closing of the valves, thereby greatly reducing labor.

In the above embodiment, the muddy water sealing structure is different between the muddy side sealing mechanism 6 and the muddy side sealing mechanism 7. The same sealing structure may be applied. In addition, as long as the outflow of muddy water can be prevented at the time of pipe extension, the same effects as described above can be obtained even if the structures of the mud sending side sealing mechanism 6 and the mud discharging side sealing mechanism 7 are configured other than the above. It goes without saying that you can do it. Further, other than this, configurations other than the above-described embodiment may be applied as long as they do not depart from the gist of the present invention.

[0034]

As described above, claims 1 and 2
According to the muddy water outflow prevention device at the time of pipe extension according to Item 2 , the muddy water discharge side sealing mechanism of the muddy water outflow prevention device is replaced with a mud sending side sealing mechanism.
The part is configured to be movable in the axial direction. Thereby, even if the lengths of the mud feeding pipe and the mud discharging pipe are different, by moving the mud feeding side sealing mechanism and the mud discharging side sealing mechanism relative to each other, each sealing It is possible to easily position and connect the pipe and the drain pipe. Therefore,
The use length of the flexible pipe used for the pipe can be minimized. Moreover, because of the use of flexible tube to the conduit, the bent can be straight as minimum, Okudoro, waste sludge can be efficiently performed.

Further , a muddy discharge side sealing mechanism of the muddy water outflow prevention device.
The part was configured to include a pressure relief valve on one side of the conduit connected to the base of the gate part. Thus, keep seals the waste sludge of waste sludge pipe hydro side sealing mechanism, when disconnecting the Haidorokan by the depressurization in the line by opening the depressurization valve, It is possible to prevent muddy water from blowing out of the pipeline. As a result, it is possible to maintain a clean working environment without polluting the surrounding working area. In addition, the gate can be depressurized by the depressurization valve, so that the slider can be easily slid.

According to the third aspect of the present invention, the pressure release valve is connected to the drain container provided in the muddy water outflow prevention device. This allows
When depressurizing the inside of the pipeline, the muddy water in the pipeline can be drained to the drain container without being scattered around. Thus, the effect of maintaining a clean working environment without polluting the surrounding working area can be further remarkable.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a muddy water outflow prevention device according to the present invention when a pipe is extended.

FIG. 2 is a plan view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Muddy water outflow prevention apparatus 2 Mud feed pipe 3 Mud discharge pipe 6 Mud feed side sealing mechanism 7 Mud discharge side sealing mechanism 12 Drain container 26 Gate part 27 Base 29 Slider 31 Rear connecting pipe (one side pipe) Path) 33 pressure release valve 36 front connection pipe (the other side pipe) 37 storage pipe (storage chamber) 41 muddy water sealing member (sealing member)

Continuation of the front page (56) References JP-A-1-207593 (JP, A) JP-A-61-10700 (JP, A) JP-A-60-5997 (JP, A) JP-A-62-141895 (JP , A) Japanese Utility Model Application Hei 5-64292 (JP, U) Japanese Utility Model Application Hei 7-20392 (JP, U) Japanese Patent Publication No. 61-8319 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB) Name) E21D 9/06 301 F16L 1/12

Claims (3)

(57) [Claims] 1. A pipeline provided with a mud pipe for feeding mud from one side to the other side and a mud pipe for discharging mud from the other side to one side. And a muddy water outflow prevention device used when extending the mud feeding pipe and the drain pipe .
There are a Okudoro side sealing mechanism that seals Okudoro of the Okudoro tube, together with and a waste sludge-side sealing mechanism for sealing the waste sludge of the waste sludge pipe, the exhaust mud side seal The stopping mechanism is the mud-side sealing machine
Being a movable structure in the axial direction relative構部, the rear end side of the Okudoro side sealing mechanism, said Okudoro tube
The flexible tube that can be stretched and bent between
And the drainage-side sealing mechanism is connected to a pipe line of the drainage pipe.
A gate portion comprising a base and a slider slidably mounted on the base so as to be slidable in one direction , wherein one side of the conduit is connected to the base by opening to the mating surface side with the slider. The slider is provided with a conduit on the other side and a containing chamber containing a sealing member therein, each of which is opened on the mating surface side with the base and is separated by a predetermined distance along the one direction. the the conduit connected on one side of the foundation provided with a closable pressure relief valve Rutotomoni,
At the rear end of the one side of the pipeline,
The interposed telescopic and bendable flexible pipes are connected
A muddy water outflow prevention device at the time of pipe extension, characterized in that it has a configuration as described above. 2. A sludge pipe for feeding mud from one side to the other side and a sludge pipe for discharging mud from the other side to one side. A muddy water outflow prevention device used to extend the mud pipe and the mud pipe, wherein a mud sending side sealing mechanism for sealing mud in the mud pipe; And the sludge-side sealing mechanism is configured to be movable in the axial direction with respect to the sludge-side sealing mechanism, and A mud-side sealing mechanism includes a base in a pipe of the mud pipe, and a gate section including a slider slidably attached to the base so as to be slidable in one direction. Is connected to the slider on the side of the mating surface with the slider, and the slider accommodates a sealing member therein with the pipeline on the other side. Are provided on the mating surface side with the base and are separated from each other by a fixed distance along the one direction. are configured to valves provided, the Okudoro side sealing mechanism includes a Okudoro side connection pipe connected to Okudoro pipe on the other side, is disposed above the Okudoro connection pipe A pipe extension, wherein a rear end side of the mud feeding side connection pipe is bent upward to be connected to an opening on a lower surface on a rear end side of the storage pipe. Muddy water outflow prevention device. 3. The muddy water outflow prevention device according to claim 1 or 2 , wherein the pressure release valve is connected to a drain container provided in the muddy water outflow prevention device. For preventing muddy water from flowing out when the pipe is extended.