JP7349297B2 - Water stop device and water stop method - Google Patents

Description

The present invention relates to a water stop device and a water stop method.

As an example of a water stop method, especially a freezing method, for example, Patent Document 1 describes a method in which a large number of freezing material injection holes are penetrated through a concrete wall at predetermined intervals around a large-diameter opening where water is flowing through the concrete wall. A hole is drilled and a freezing material is injected through the injection hole to freeze the spring water or discharged water discharged from the opening. Between the injection holes, a new water stop material injection hole is drilled through the concrete wall, and the water stop material is injected through the water stop material injection hole within the time until the frozen part thaws. A technique is disclosed for hardening a running water section on the back side of a wall.

Japanese Patent Application Publication No. 2000-110497

Opportunities for freezing construction methods to be applied in place of conventional ground improvement are increasing. As a conventional technology, when there is water leakage (also called spring water), freezing material is injected around the water leakage point to freeze the water leakage, and as a secondary treatment, after freezing, water stopper material is injected to close the water leakage point. There is a technique for curing (for example, Patent Document 1). However, it may be difficult to freeze the ground in areas where water is flowing, in other words, where there is movement of water.

In view of the above problems, it is an object of the present invention to provide a new water stopping technique that can stop water leakage more reliably than before.

In order to solve the above problems, the present invention focuses on the fact that it is difficult to freeze the ground in places where there is movement of water, and decided to control the flow of water at the place where water flows to cause freezing.

Specifically, the present invention is a water stop device that includes a coolable storage section that covers a water outlet and stores water from the water outlet.

According to the water stop device according to the present invention, by storing the water flowing out, it is possible to control the movement of the water so that it is easy to freeze, and to exchange heat. As a result, the water can be frozen and stopped even in locations where water is flowing. Since no water-stopping agent is used, water can be stopped while minimizing the impact on water leakage locations.

Further, the present invention includes a cooling pipe through which a cooling medium supplied from a supply unit that supplies the cooling medium flows, and a storage unit that is provided with the cooling pipe, covers the water outflow location, and stores the water flowing out from the water outflow location. It is a water stop device.

According to the water stop device according to the present invention, the water can be frozen and stopped by storing the water and controlling the movement of the water so as to facilitate freezing and exchanging heat. Since no water-stopping agent is used, water can be stopped while minimizing the impact on water leakage locations.

A cryogenic cooling medium can be used as the cooling medium. By using the cold energy of the cryogenic cooling medium, water can be stopped in a short period of time. The cryogenic cooling medium can be liquid air. Liquid air (also referred to as liquefied air) is air that has been liquefied, and its boiling point under normal pressure is approximately -190°C. By using liquid air, the liquid air used in the water stop device can be discharged. For example, liquid nitrogen (boiling point under normal pressure is about -196°C) can also be used as the cryogenic cooling medium. When using liquid nitrogen, there is a concern that if it is discharged into the site (particularly in a tunnel where there is little airflow and ventilation is required), there will be a shortage of oxygen within the site. On the other hand, when liquid air is used, oxygen deficiency can be reduced compared to when liquid nitrogen is used.

Here, the storage part is provided in a planar plate part that covers the water outflow point, an outer edge of the plate part, is connected to the periphery of the water outflow part, and is provided in the enclosure part that dams up the outflow water, and in the plate part. , and a water guide section that guides the stored water to the outside.

Water can be stored in a storage space surrounded by the surface of the water outflow location, the plate part, and the enclosure part. In addition, the stored water can be guided to the outside from the water guide portion, or in other words, can be discharged. Thereby, the amount of water to be stored and the flow of water to be stored can be controlled. Note that the piping may be embedded inside the storage section, or may be connected to the outside of the storage section. Alternatively, the cooling medium may be directly supplied to the water stored in the storage space.

The storage section may further include a connection section that is provided on at least one of the plate section and the enclosure section, and that fixes the storage section to the water outlet location. The fixing portion may include a connecting member such as a bolt and a bolt hole. Further, the fixing section may be configured with a vacuum suction section that suctions using a pressure difference between atmospheric pressure and the pressure inside the connection section. Alternatively, the storage part may be connected to the area around the water outlet by embedding piping inside the connection part and freezing the water adhering to the storage part by the action of the cold heat of the cooling medium flowing through the cooling pipe. .

Here, the water guide section may include a water guide amount adjustment section that is disposed near the water outflow location and can adjust the amount of water guide. By arranging the water guide section near the water outlet and making it possible to adjust the amount of water introduced, the movement of the stored water can be suppressed. By adjusting the amount of water introduced so that the storage space is sufficiently filled with water, movement of water within the storage space can be minimized. As a result, the running water becomes more likely to freeze.

The water stop device according to the present invention may further include a supply section that supplies a cooling medium, and a supply pipe that sends the cooling medium supplied from the supply section to the pipe. This makes it possible to supply the cooling medium.

Here, the present invention may be specified as a water stopping method. For example, the present invention includes a specific step of identifying the location of water leakage, and storage of water from the location of water leakage identified in the specific step, and freezing the water by controlling the movement of the water and exchanging heat to facilitate freezing. The water stopping method includes a water stopping step of stopping the water by doing so.

According to the water stop method according to the present invention, water can be stopped by freezing the water flowing out. Since no water-stopping agent is used, water can be stopped while minimizing the impact on water leakage locations.

The water stop method according to the present invention may further include a preparatory step of reducing the range of water leakage after identifying the water leakage location in the identifying step. By performing the preparation process, water can be stopped more reliably.

Moreover, in the water stop process, the stored water may be introduced to the outside. Thereby, the amount of water to be stored and the flow of water to be stored can be controlled. Moreover, in the water stop process, water may be introduced from the vicinity of the water outflow point while adjusting the amount of water introduced. This allows the movement of stored water to be minimized. As a result, the running water becomes more likely to freeze.

According to the present invention, it is possible to provide a new water stopping technique that can stop water leakage more reliably than before.

FIG. 1 shows a front view of a water stop device according to an embodiment. FIG. 2 shows a rear view of the water stop device according to the embodiment. Figure 3 shows the situation of water gushing from the gushing locations. FIG. 4 shows a situation where the flood area is reduced. FIG. 5 shows a situation in which the water stop device is fixed. FIG. 6 shows a situation in which the water stop device is fixed, the water is stored, and the water is guided from the water guide section. FIG. 7 shows the situation in which the cooling piping, supply piping, discharge piping, and supply section are installed. FIG. 8 shows a situation in which a water stop device cools a water outflow location. FIG. 9 shows the situation of stored water. FIG. 10 shows the state of removal of the water stop device.

Next, embodiments of the present invention will be described based on the drawings. The following description is an example, and the present invention is not limited to the following content.

<Embodiment>
<Configuration of water stop device>
FIG. 1 shows a front view of a water stop device according to an embodiment. FIG. 2 shows a rear view of the water stop device according to the embodiment. The water stop device 100 includes a supply section 2, a supply pipe 3, a cooling pipe 101, and a storage section 102. The storage section 102 includes a plate section 103, an enclosure section 104, a water guide section 105, and a fixing section 106. Note that in FIGS. 1 and 2, the cooling pipe 101 and the storage section 102 are shown enlarged (emphasized) compared to the supply section 2 and the supply pipe 3.

The supply unit 2 stores liquid air as a cooling medium and supplies the stored liquid air. Liquid air (also referred to as liquefied air) is air that has been liquefied, and its boiling point under normal pressure is approximately -190°C. For example, liquid nitrogen (boiling point under normal pressure is about -196°C) may be used as the cooling medium. Furthermore, brine (for example, an aqueous calcium chloride solution at about -30° C.) having a higher temperature than liquid air or liquid nitrogen may be used as the cooling medium. Note that the supply unit 2 may be configured as a separate device from the water stop device 100.

The supply pipe 3 has one end connected to the supply part 2 and the other end connected to the inlet side of the cooling pipe 101, through which liquid air flows. A flexible hose through which liquid air can flow can be used as the supply pipe 3. The supply pipe 3 is preferably covered with a heat insulating material (for example, foamed polyethylene) so that cold heat does not escape. The supply piping 3 may be configured as a separate device from the water stop device 100. In the embodiment, a discharge pipe 31 made of a flexible hose like the supply pipe 3 is connected to the outlet side of the cooling pipe 101, so that the liquid air after heat exchange can be discharged. In addition, when using a reusable cooling medium, the supply pipe 3 may be connected to the supply part 2 and the cooling pipe 101 so that the cooling medium can circulate between the supply part 2 and the cooling pipe 101.

The storage unit 102 covers the water outflow location and stores water from the water outflow location. The storage section 102 includes a plate section 103, an enclosure section 104, a water guide section 105, and a fixing section 106. The plate portion 103 is made of a plate-shaped steel member and covers the water outflow location. The plate portion 103 according to the embodiment has a rectangular shape. The enclosure part 104 is connected to the area around the water outflow location and dams up the outflowing water. The enclosure section 104 is made of a rod-shaped steel member, and is provided inside the outer edge of the plate section 103 so as to protrude from the back surface of the plate section 103. Moreover, the enclosure part 104 is provided with a water stop rubber 104a as a water leakage suppressing part that suppresses the leakage of water on the connection surface with the water outflow location. Further, in the embodiment, when the storage section 102 is installed on a vertical wall, the enclosure section 104 is provided so that the upper part thereof is open. Water is stored in a storage space 107 surrounded by the surface of the water outflow location, the plate section 103, and the enclosure section 104. The water guide section 105 is composed of a through hole provided near the center of the plate section 103, and guides the stored water to the outside. Further, the water guide section 105 is provided with a valve 105a (an example of the water guide amount adjusting section of the present invention) that adjusts the amount of water to be introduced. The fixing part 106 fixes the storage part 102 to the water outlet location. The fixing part 106 includes a plurality of bolt holes 106a formed at intervals on the outer edge of the plate part 103 and bolts 106b fixed to the bolt holes 106a. The fixing section 106 may be configured as a vacuum suction section that uses a pressure difference between atmospheric pressure and the pressure inside the fixing section 106 to perform suction. The plate portion 103 and the enclosure portion 104 may be made of metal such as stainless steel, copper, or silver. Further, the shapes of the plate portion 103 and the enclosure portion 104 are not limited to those described above. For example, assuming that the storage section 102 is connected to a ceiling or a floor, the enclosure section 104 may be provided so as to go around the inside of the outer edge of the plate section 103 without leaving a portion open.

Note that the water stop device 100 may be configured to further include a storage section heat insulating section (not shown) that covers the storage section 102. The storage section heat insulating section covers the plate section 103 and the enclosure section 104. The storage section heat insulating section can be made of, for example, foamed polyethylene. By having a configuration including a heat insulating section for the storage section, heat exchange, that is, cooling can be performed efficiently.

The cooling pipe 101 is provided in the storage space 107 and cools the stored water. Liquid air supplied via the supply pipe 3 flows through the cooling pipe 101 . Liquid air is discharged through a discharge pipe 31 connected to the outlet side of the cooling pipe 101, and a portion of the liquid air is vaporized. The cooling pipe 101 according to the embodiment is a steel pipe with a circular cross section, and has a zigzag shape in which a straight part and a bent part (U-shape) are continuously connected. The cooling pipe 101 may be made of any material that can flow liquid air, and is not limited to steel. The cooling pipe 101 may be made of metal such as stainless steel, copper, or silver. Further, the cross-sectional shape of the cooling pipe 101 may be a shape other than a circle, such as a rectangle or a triangle. Further, the shape of the cooling pipe 101 is not limited to a zigzag shape as long as it can uniformly transmit cold heat to the stored water. The cooling pipe 101 may include a branch part and a plurality of parallel small pipes connected to the branch part. Further, the cooling pipe 101 may have a spiral shape. Further, the cooling pipe 101 may have a thin planar shape.

The storage section 102 may further include a grip section that functions as a handle when connecting the storage section 102 to a water outlet location. With the configuration including the grip part, work efficiency can be improved.

<Water stop method>
3 to 10 show diagrams for explaining the water stop method. Hereinafter, as an example of a water stopping method, a case will be described in which the water stopping device 100 is used to stop water from flowing in a tunnel constructed in deep ground.

Figure 3 shows the situation of water gushing from the gushing locations. In step 01, a water outflow location is identified (an example of the identification process of the present invention). In FIG. 3, a gap between segments S of the tunnel (a gap extending in the vertical direction) is a water leakage point, and is identified as the water leakage point.

FIG. 4 shows a situation where the flood area is reduced. In step 02, the water outflow range is reduced (an example of the preparation process of the present invention). Specifically, the range of water leakage is reduced by filling the water leakage area with stuffing material 110 such as a waste cloth.

FIG. 5 shows a situation in which the water stop device is fixed. In step 03, the storage section 102 of the water stop device 100 is connected to cover the water outflow location. Specifically, the connection location of the storage section 102 is positioned so that the water outlet point and the water guide section 105 coincide, and the bolt hole (not shown) on the segment side is installed on the surface of the water outlet point corresponding to the bolt hole 106a of the plate section 103. ) is formed, and the storage portion 102 is connected to the water outlet point with a bolt 106b. Step 03 to step 07, which will be described later, are an example of the water stop process of the present invention.

FIG. 6 shows a situation in which the water stop device is fixed, the water is stored, and the water is guided from the water guide section. In step 04, the drained water is stored, and the drained water is guided (discharged to the outside) from the water guiding section 105.

FIG. 7 shows the situation in which the cooling piping, supply piping, discharge piping, and supply section are installed. In step 05, the cooling pipe 101, the supply pipe 3, the discharge pipe 31, and the supply section 2 are installed. Specifically, the supply pipe 3 connected to the supply part 2 is connected to the cooling pipe 101, and the cooling pipe 101 is arranged in the storage space 107. Note that the cooling pipe 101 may be fixed to the storage section 102 in advance.

FIG. 8 shows a situation in which a water stop device cools a water outflow location. In step 06, the water stop device 100 cools the water outlet and shuts off the water. Specifically, supply of the cooling medium from the supply unit 2 is started. On the other hand, the amount of water to be guided is adjusted by the valve 105a of the water guide section 105 so that the water stored in the storage space 107 does not overflow from the upper part of the storage section 102. FIG. 9 is a diagram of the storage section 102 viewed from the back side, and shows the situation of stored water flowing out. As shown in FIG. 9, the water is stored in the storage space 107, and the amount of water introduced is adjusted so that the stored water does not overflow from the open upper part of the storage section 102 where the enclosure section 104 is not provided. be done.

FIG. 10 shows the state of removal of the water stop device. In step 07, the water stop device 100 is removed. Specifically, the draining water stored from the upper open part of the storage section 102 where the enclosure section 104 is not provided is confirmed, and if it is confirmed that the stored draining water has frozen, the valve 105a is closed and the water stop device is turned on. 100 will be removed. The frozen stored water is removed together with the storage section 102, but since the water is frozen at the water source, the water is stopped from flowing. Thereafter, if necessary, an existing water shutoff method may be used to more reliably shut off water at the location where water is coming out.

<Effect>
According to the water stop device 100 and the water stop method according to the embodiments described above, by storing the flowing water, it is possible to control the movement of the water so that it is easy to freeze, and to exchange heat. More specifically, the storage section 102 is connected to the water outlet so as to cover the water outlet so that the water guide part 105 and the water outlet coincide with each other, and the water guide part 102 is connected to the water outlet so that the water outlet part 105 is sufficiently filled with water and does not overflow. By adjusting the amount of water introduced from section 105 with valve 105a, movement of water within storage space 107 can be minimized. As a result, the water tends to freeze even in places where water moves. In addition, since no water-stopping agent is used, water can be stopped while minimizing the impact on water leakage locations.

Furthermore, by using liquid air, which is a cryogenic cooling medium, as the cooling medium, it is possible to freeze and stop the water flowing out in a shorter time than when using brine, which has a higher temperature than liquid air. By shutting off the water in a short period of time, construction interruptions can be minimized. Further, by using liquid air, even when liquid air is discharged, oxygen shortage at the site can be reduced compared to, for example, when liquid nitrogen is used.

Although the embodiments of the present invention have been described above, the water stop device and the water stop method according to the present invention are not limited to the above-mentioned contents. Changes can be made without departing from the gist of the invention. For example, as an example of an underground structure, stopping water from flowing out from a gap in a segment S of a tunnel has been described as an example, but the water stopping device and the water stopping method according to the present invention can be used to prevent water from flowing out of various underground structures. It can be used for Furthermore, the water shutoff device and the water shutoff method according to the present invention can be suitably used as an emergency measure for water outflow locations where there is movement of water, in other words, as a backup tool, but they can also be used for water outflow countermeasures for various underground structures. can. Examples of underground structures include underground structures (underground structures) such as tunnels, public ditches, underground parking lots, underground station buildings, and shafts.

Further, the cooling pipe 101 may be embedded inside the plate portion 103 or the enclosure portion 104. In this case, the water adhering to the fixing part 106 is frozen by the action of the cooling medium flowing through the cooling pipe 101 embedded inside the fixing part 106, thereby connecting the storage part 102 to the area around the water outflow point. I can do it.

Further, the cooling pipe 101 may be connected to the outside of the plate portion 103. Alternatively, liquid nitrogen as a cooling medium may be directly supplied to the stored water.

2... Supply section 3... Supply piping 100... Water stop device 101... Cooling piping 102... Storage section 103... Plate section 104... Enclosure section 105... Water guide section 106 ···Fixed part

Claims (4)

a cooling pipe through which a cooling medium supplied from a supply unit that supplies the cooling medium;
A storage part equipped with cooling piping that covers the water leakage point and stores the water flowing out from the water leakage point,
The storage part includes a plate-like plate part that covers the water leakage point, and an enclosure part that is provided at the outer edge of the plate part so that the upper part is open, protrudes from the plate part, is connected to the periphery of the water leakage point, and dams up the water leakage. and a water guide part that is provided in the plate part and guides the stored water to the outside, the water guide part being able to adjust the amount of water to be introduced. The water stop device according to claim 1, wherein the water guide portion has a through hole provided near the center of the plate portion, and a water guide amount adjustment portion provided in the through hole to adjust the amount of water introduced. 3. The water stop device according to claim 1, wherein the enclosure has a water leakage suppressing part for suppressing leakage of water on a connection surface with the water outflow location. an identification process for identifying the location of water leakage;
Includes a water stop process in which the water from the water source identified in the specific process is stored, and the water is frozen and stopped using a water stop device that controls the movement of water and exchanges heat so that it is easy to freeze. ,
The water stop device includes a cooling pipe through which a cooling medium is supplied from a supply unit that supplies the cooling medium;
A storage part equipped with cooling piping that covers the water leakage point and stores the water flowing out from the water leakage point,
The storage part includes a plate-like plate part that covers the water leakage point, and an enclosure part that is provided at the outer edge of the plate part so that the upper part is open, protrudes from the plate part, is connected to the periphery of the water leakage point, and dams up the water leakage. and a water guide part that is provided in the plate part and guides the stored water to the outside, the water guide part being able to adjust the amount of water to be introduced.