JP5042783B2 - Water leakage part freezing device and water leakage part water stop method - Google Patents

Description

The present invention, when stopping small-scale water leakage from the ground or a structure, etc., can be used even when the water leakage part is not flat or in a narrow part, and is a pressing type simple freezing device that can be handled lightly and efficiently, and The present invention relates to a water stopping method using this.

When small-scale water leakage is confirmed from ground improvement bodies or poor water stoppages such as structures in non-open-cutting ground cutting expansion work, it is necessary to take measures to stop water early, especially under high water pressure. It is. If measures are not taken at an early stage, the scale of water leakage will increase, causing serious troubles such as submergence accidents and ground surface depression accidents.

Especially for frozen ground, a general water-stop method such as chemical solution injection is not an effective water-stop method because it causes melting of frozen soil and damage to the water leakage part.

Such a water leakage part has no effect on the frozen ground, and as an emergency water stop device, a water stop frame is formed around the contact part that contacts the ground, and the contact part is cooled. There is a pressing type simple freezing device in which a cooling pipe for circulating a cooling medium is built in (Patent Document 1).
JP 2005-16225 A

However, since the freezing apparatus according to Patent Document 1 covers the entire water leakage part with a water stop frame, there is a problem that use in a narrow part or a case where there is a step in the water leakage part is limited. Moreover, since there is a distance between the contact portion and the cooling portion, there is a problem that the ground or the like cannot be efficiently cooled. Furthermore, as a configuration of the apparatus, there is a problem that the structure is complicated and heavy because the cooling pipe is bent and arranged in the cooling section and the contact section has a separate structure.

The present invention has been made in view of such a problem, and can be used even when the water leakage portion is not flat or narrow when the small-scale water leakage is stopped from the ground or a structure, etc. An object of the present invention is to provide a pressing-type simple freezing device that is lightweight and has high cooling efficiency, and a water stop method using the same.

A first invention for achieving the above-described object is a freezing device that freezes a water leakage portion by pressing against the water leakage portion from the ground or a structure, and stops the water leakage. A drainage pipe provided in the drainage pipe, a valve provided in the drainage pipe, a freezing pipe that is provided in a plurality of circumferential directions on the outer periphery of the lower end portion of the pressure vessel, and that allows a refrigerant to flow therein, and the freezing pipe And a plastic heat conductive material provided so as to fill a gap between the freezing pipe and the ground which is a cooling target portion, and when the freezing pipe is pressed against a water leakage portion, the freezing pipe is provided with the heat conducting material. It is a freezing device characterized in that it can be deformed following the deformation of the above.

The freezing tube may be covered with a heat transfer material. You may further comprise the heater provided around the said drain pipe, and the heat insulating material which covers the said heater.

You may further comprise the band of a flexible material which couple | bonds the said freezing tube and the said pressure | voltage resistant container.

According to the first invention, in the case where small-scale water leakage is stopped from the ground or a structure, etc., the freezing pipe through which the refrigerant flows is flexible and the heat conducting material has plasticity, so that the water leakage portion is not flat. In addition, it is possible to provide a pressing-type simple freezing apparatus that can also be applied to narrow and narrow portions. In addition, since the distance between the freezing pipe and the cooling unit is short, it is possible to provide a push-type simple freezing device that has extremely high cooling efficiency and is light in weight because of its simple structure.

The second invention is a water stopping method for freezing water by freezing the water leakage part, and presses the freezing device according to claim 1 against the water leakage part while deforming the heat conducting material and the freezing pipe according to the level difference. The step (a), the step (b) of flowing a refrigerant through the freezing pipe, the step (c) of closing the valve of the drainage pipe, and the step (d) of freezing the leaking part. It is the water stop method of the water leakage part characterized.

According to the second invention, in the case of stopping small-scale water leakage from the ground or a structure, it can be applied even when the water leakage portion is not flat or narrow, and extremely high cooling efficiency is achieved. A quick and reliable water stop method can be provided by using the pressing type simple freezing device.

According to the present invention, in the case of stopping small-scale water leakage from the ground or a structure, etc., it can be used even when the water leakage portion is not flat or in a narrow portion, and is a simple, lightweight, and highly efficient cooling type. A simple freezing apparatus and a water stop method using the same can be provided.

Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a perspective view showing an external appearance of a freezing device 1 according to the present embodiment, and FIG. 2 is a cross-sectional view showing a state in which the freezing device 1 according to the present embodiment is pressed against a water leakage part 21. is there.

The freezing apparatus 1 mainly includes a pressure vessel 3, a drain pipe 5, a freezing pipe 9, and a heat conductive material 17. A water distribution pipe 5 is attached in the vertical direction substantially at the center of the pressure vessel 3. The drain pipe 5 is provided through the pressure vessel 3. A valve 7 is attached above the drain pipe 5, and the fluid flowing therethrough can be stopped if necessary. In addition, although the pressure vessel 3 is hemispherical in FIG. 1, it may have another shape.

In FIG. 1, the drain pipe 5 extends to the lower end of the pressure vessel 3, and a seal 6 is provided at the lower end of the drain pipe 5. In this way, the water leakage can be guided directly to the drain pipe 5 and the cooling efficiency can be increased, but it is not always necessary to extend the drain pipe 5 into the pressure vessel. In addition, a hose or the like (not shown) is connected to the upper end of the drain pipe 5 in advance so that the fluid flowing inside can be drained. The material of the seal 6 is not specified, but rubber or sponge can be used.

On the outer periphery of the lower end portion of the pressure vessel 3, a plurality of freeze tubes 9 are provided in the circumferential direction. The freezing tube 9 is coupled to the pressure vessel 3 by bands 15 at several locations in the circumferential direction. A refrigerant introduction tube 13 is attached to one end of the freezing tube 9. A refrigerant discharge pipe 11 is attached to the other end. The freezing tube 9 is covered with the heat conductive material 17, and the freezing tube 9 cannot be visually recognized from the outside. The heat conducting member 17 does not necessarily need to cover the freezing tube 9, and will be described later in detail, but may be provided only at a necessary portion of the freezing tube 9.

When the refrigerant flows from the refrigerant introduction pipe 13, the refrigerant flows through the freezing pipe 9 around the pressure-resistant container 3 and is discharged from the refrigerant discharge pipe 11. At this time, the freezing tube 9 is cooled by the refrigerant, and the part to be cooled is cooled and frozen through the heat conducting material 17.

For this reason, the freezing pipe 9 can freeze the ground 19 more quickly as close as possible to the ground 19. Therefore, it is sufficient that the heat conductive material 17 has a thickness sufficient to be in close contact with the ground 19, and if it is thicker than necessary, the cooling efficiency of the ground 19 is lowered.

On the other hand, if the pressure vessel 3 is too large, use in a narrow portion described later is restricted, and the weight of the freezing device 1 is increased. Furthermore, since the distance between the freezing pipe 9 and the water leakage part 21 is increased, the time required until the water leakage part 21 is frozen becomes longer. Therefore, it is desirable that the outer diameter of the pressure vessel 3 is not so large, for example, about 20 cm.

Here, although the materials of the pressure vessel 3, the drain pipe 5, the refrigerant introduction pipe 13, and the refrigerant discharge pipe 11 are not specified, for example, aluminum or stainless steel can be used. Moreover, although the freezing pipe 9 may be a general steel pipe, as will be described later, a flexible hose is desirable in order to increase the degree of freedom of use. The material of the pressure vessel 3 may be a metallic material having rigidity, but may be a film having no rigidity.

The band 15 only needs to be able to couple the freezing tube 9 and the pressure vessel 3, but it is desirable to use a flexible material in order to freely deform the freezing tube 9 as will be described later. Can be used. Moreover, although the heat conductive material 17 is not specified, a putty-like adhesive material and a plastically deformable material are desirable. In this case, since the heat conductive material 17 is a plastic material, it follows the unevenness of the ground and is in close contact with the ground 19. As the heat conductive material 17, for example, a material obtained by mixing metal powder into clay can be used. Although illustration is omitted, in order to increase the cooling efficiency, it is desirable to cover the entire outside of the freezing apparatus 1 including the heat conducting material 17 with a heat insulating material.

Next, a water stop method using the freezing apparatus 1 will be described. FIG. 3 is a flowchart showing a water stop method using the freezing apparatus 1 according to the present embodiment. When the leaking part 21 is found, first, the freezing device 1 is pressed against the leaking part 21 (step 101). As shown in FIG. 2, when the drain pipe 5 is pressed against the water leaking portion 21 with the valve 7 opened, the water leak 23 flows through the drain pipe 5 and is discharged to the outside (direction A in the figure). In addition, the water leakage part 21 may occur not only in the ground 19 but also in a structure such as a retaining wall or frozen soil.

Next, the refrigerant 25 is caused to flow to the freezing tube 9 (step 102). FIG. 4 is a cross-sectional view showing a state in which the refrigerant 25 is caused to flow through the freezing tube 9. When the coolant 25 is caused to flow through the freezing tube 9, the ground 19 is cooled by the coolant 25 through the heat conducting material 17. Here, as described above, the heat conductive material 17 may not be provided so as to cover the freezing tube 9. That is, it is only necessary to provide the heat conductive material 17 only in a portion that fills the gap between the freezing tube 9 and the ground 19 that is a cooling target portion.

As the refrigerant 25, for example, liquid nitrogen can be used. When liquid nitrogen is used, the liquid nitrogen container is connected to the refrigerant introduction pipe 13, the liquid nitrogen is introduced into the freezing pipe 9, and the nitrogen gas exhausted from the refrigerant discharge pipe 11 is discharged into the atmosphere (in a closed space such as a tunnel). If so, release it to the outside).

FIG. 5 is a cross-sectional view showing a state where the contact portion between the heat conductive material 17 covering the freezing tube 9 and the ground 19 has started freezing. The heat conducting material 17 can efficiently transmit the cold heat from the freezing tube 9 to the ground, and since the freezing tube 9 and the ground 19 are very close to each other, the cooling efficiency in the freezing tube 1 is very high. .

After confirming that the ground 19 in the vicinity of the heat conductive material 17 starts freezing and the frozen portion 27 is generated, the valve 7 provided in the drain pipe 5 is closed (steps 103 to 104). At this time, there is a possibility that some water leakage 23 flows out of the drain pipe 5 from the seal 6 due to the water pressure of the water leakage 23. However, since the water leakage 23 is frozen by contact with the freezing part 27, the outside of the pressure vessel 3 Will not flow into The time from when the freezing device 1 is pressed against the water leakage part 23 to when the valve 7 is closed to stop the water suddenly is approximately 10 to 20 minutes depending on the amount of water leakage and the ground conditions.

FIG. 6 is a diagram illustrating a state where the range of the freezing portion 27 is widened and freezing is completed up to the water leakage portion 21. The water leakage 23 is stopped by freezing the water leakage portion 21. After confirming that the water leakage part 21 is completely frozen, the refrigerant 25 of the freezing device 1 is stopped (steps 105 to 106).

Next, the freezing device 1 is removed, and the water stop operation is completed (step 107). FIG. 7 is a view showing a state in which the freezing device 1 is removed after the water leakage part 21 is frozen. Although depending on the ground conditions, once the water leakage part 21 is completely frozen, the water leakage state of the water leakage part 21 can be maintained for about 50 minutes to 1 hour even after the freezing device 1 is removed. . For this reason, permanent water stoppage measures can be taken during this period.

Next, the case where the freezing apparatus 1 is used in a place with a step will be described. FIG. 8 is a diagram illustrating an installation state when the freezing device 1 is applied to the water leakage part 21 in a place with a step. Even when the water leakage portion 21 is in the vicinity of the step, the same steps from Step 101 to Step 107 shown in FIG. 3 are performed.

In order to press the freezing device 1 against the water leakage part 21 near the step, the heat conducting material 17 and the freezing pipe 9 may be deformed according to the step. The contact area between the heat conductive material 17 covering the freezing tube 9 and the ground surface 19 is smaller than that when used on a flat place, but the same effect as when used on a flat place can be obtained.

When used in such a situation, the range where the degree of freedom of deformation of the freezing tube 9 is larger becomes wider. For this reason, it is desirable that the freezing tube 9 is a member that can be freely deformed, such as a flexible hose. For example, a bellows tube made of aluminum or stainless steel can be used.

Next, the case where the freezing apparatus 1 is used in a narrow part will be described. FIG. 9 is a diagram showing an installation state when the freezing device 1 is applied to the water leakage part 21 in a narrow place. Even when the water leakage part 21 is in a narrow place, the same process from step 101 to step 107 shown in FIG. 3 is performed.

In order to press the freezing device 1 against the leaking portion 21 of the narrow portion, the heat conducting material 17 and the freezing tube 9 may be deformed according to the adjacent wall surface or the like. The contact area between the heat conductive material 17 covering the freezing tube 9 and the ground surface 19 is smaller than that when used on a flat place, but the same effect as when used on a flat place can be obtained. When used in such a situation, it is better that the pressure vessel 3 is as small as possible, and as described above, the range in which the degree of freedom of deformation of the freezing tube 9 is larger becomes wider.

As described above, according to the freezing device 1 according to the present embodiment, the water leakage 23 can be stopped efficiently. In particular, the freezing tube 9 is disposed at a position very close to the ground 19, and since the heat conductive material 17 has plasticity and is in close contact with the ground, the cooling efficiency of the ground 19 is extremely high.

Since the freezing pipe 9 is made of a flexible member such as a flexible hose, the freezing pipe 9 can be applied to the leaking part 21 having a step or the leaking part 21 in a narrow part together with the plasticity of the heat conducting material 17.

In addition, the freezing device 1 has a simple structure and is light in weight because it has few components. Furthermore, since the freezing tube 9 and the pressure vessel 3 are separate bodies, the number of turns of the freezing tube 9 can be reduced or the size of the pressure vessel 3 can be reduced as necessary. It is also possible to obtain Moreover, if the pressure vessel 3 is made smaller, the positions of the water leakage part 21 and the freezing pipe 9 can be made closer, and the water leakage part 21 can be frozen more quickly.

Next, the freezing apparatus 30 according to the second embodiment will be described. Here, in this Embodiment, about the component which show | plays the same function as the freezing apparatus 1, the code | symbol same as FIGS. 1-2 is attached | subjected and the overlapping description is avoided.

FIG. 10 is a cross-sectional view showing a state in which the freezing device 30 according to the second embodiment is pressed against the water leakage part 21. Even when the water leakage part 21 is stopped by the freezing device 30, it is performed in the same process from step 101 to step 107 shown in FIG.

First, the freezing device 30 is pressed against the water leakage part 21, and the refrigerant 25 is caused to flow through the freezing pipe 9 (steps 101 to 102). In this state, since the valve 7 is open, the water leakage 23 is discharged to the outside through the drain pipe 5.

Here, if the ground 19 in contact with the heat conducting material 17 starts freezing, the process proceeds to the next step and the valve 7 is closed (steps 103 to 104). However, since the cooling effect by the freezing pipe 9 extends to the drainage pipe 5 through the pressure vessel 3, there is a possibility that the water leakage 23 in the drainage pipe 5 may freeze faster than the ground 19 freezes. In this case, due to the pressure of the leak water 23, the leak water 23 may flow out into the pressure vessel 3 and further out of the pressure vessel 3.

In order to solve the above problem, the freezing device 30 is provided with a heater 29 around the drain pipe 5 and further provided with a heat insulating material 31 so as to cover the heater 29. When the freezing device 30 is used, the heater 29 is turned on at the same time as the coolant 25 is flowed. The drain pipe 5 and the water leak 23 in the drain pipe 5 are warmed by the heater 29 and do not freeze. Although the heater 29 is not specified, a band heater or a ribbon heater can be used.

The water stop method using the freezing device 30 is the same as the subsequent steps 103 to 107 in the freezing device 1.

According to the freezing device 30 according to the second embodiment, the same effects as the freezing device 1 according to the first embodiment are obtained.

Moreover, since the water leakage 23 in the drain pipe 5 does not freeze, the drain pipe 5 is not blocked. For this reason, due to the water pressure of the leak water 23, the leak water 23 flows out from the drain pipe 5, and further prevents the leak water 23 from flowing out of the pressure vessel 3 through the gap between the heat conducting material 17 and the pressure vessel 3 where freezing has not progressed. can do.

As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

For example, in the freezing apparatus according to the present invention, an example in which the freezing tube is wound three times around the pressure vessel has been shown, but the freezing tube may be installed only once around the pressure vessel, and more It may be.

The perspective view which shows the external appearance of the freezing apparatus 1 concerning this Embodiment. Sectional drawing which shows the state which pressed the freezing apparatus 1 against the water leakage part 21. FIG. The flowchart which showed the water stop method using the freezing apparatus 1 which concerns on this Embodiment. FIG. 4 is a cross-sectional view showing a state in which a refrigerant 25 is caused to flow through a freezing tube 9 Sectional drawing which shows the state which the contact site | part of the heat conductive material 17 and the ground 19 which covers the freezing tube 9 started freezing. The figure which shows the state which the range of the freezing part 27 spreads and the freezing of the leaking part 21 was completed. The figure which shows the state which the water leak part 21 frozen and the freezing apparatus 1 was removed. The figure which shows the installation state at the time of applying the freezing apparatus 1 to the water leaking part 21 in the place with a level | step difference. The figure which shows the installation state at the time of applying the freezing apparatus 1 to the water leaking part 21 in a narrow place. Sectional drawing which shows the state which pressed the freezing apparatus 30 concerning 2nd Embodiment to the water leak part.

Explanation of symbols

1. 30 ... Freezing device 3 ... Pressure vessel 5 ... Drain pipe 7 ... Valve 9 ... Freezing pipe 11 ... Freezing pipe 13 ... Refrigerant discharge pipe 15 ... Refrigerant introduction Pipe 17 ......... Heat conductive material 19 ......... Ground 21 ......... Leakage part 23 ......... Leakage part 25 ...... Refrigerant 27 ...... Frozen part 29 ...... Heater 31 ......... Insulation material

Claims (4)

A freezing device that freezes the water leakage part by pressing against the water leakage part from the ground or structure,
A pressure vessel,
A drain pipe provided through the pressure vessel;
A valve provided in the drain pipe;
A plurality of circumferentially provided at the outer periphery of the lower end portion of the pressure vessel, a freezing pipe capable of flowing a refrigerant inside;
A plastic heat conductive material provided in the freezing pipe so as to fill a gap where the freezing pipe and the ground which is a cooling target portion face each other;
Equipped with,
The freezing apparatus, wherein the freezing pipe can be deformed following the deformation of the heat conducting material when pressed against the water leakage portion . The freezing apparatus according to claim 1 , wherein the freezing tube is covered with the heat conducting material . The freezing apparatus according to claim 1 or 2, further comprising a band made of a flexible material for connecting the freezing tube and the pressure vessel. A water stopping method that freezes a water leakage part and stops water,
The step (a) of pressing the freezing device according to claim 1 against the water leakage part while deforming the heat conductive material and the freezing pipe according to the step ,
Flowing the refrigerant through the freezing pipe (b);
Closing the valve of the drain pipe (c);
A step (d) of freezing the water leakage part;
The water-stopping method of the water leakage part characterized by comprising.

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