JP5205312B2 - Water flow management system and water-sealed underground tank - Google Patents

Description

  The present invention relates to a water flow management system for water-sealed boring used in a water-sealed underground tank for containing liquefied petroleum gas or the like in an underground cavity by water pressure, and a water-sealed underground tank equipped with the same.

  Conventionally, when a cavity is formed in the rock mass and fluid such as liquefied petroleum gas is stored inside it, the stored material may leak from the crack of the rock mass. A type underground tank is known (see Patent Documents 1 and 2, etc.).

  Here, if the groundwater pressure around the underground cavity is high, the stored product can be contained naturally, but the natural groundwater level alone fluctuates and the pressure changes or the water pressure above the stored vapor pressure is secured. There is a possibility that the water sealing function cannot be exhibited sufficiently.

  Therefore, as disclosed in Patent Documents 1 and 2, by providing a water-sealed boring around the cavity and continuously supplying water from the water-sealed boring, the water pressure desired around the cavity can be stabilized. We are trying to secure it.

JP 2008-32406 A JP 2002-147156 A

  However, when water supply by water ring boring is continued, inclusions such as water and sand and scale mixed in the water ring boring adhere to the inside and entrance of the crack of the rock mass that becomes the water channel. Clogging may occur, and sufficient water may not be pumped toward the cavity.

  In addition, since this water flow is a one-way flow from the water-sealed boring side toward the rock, even if the pressure of the water to be pumped is increased, it is only pressed against the cracks and the wall surface. It is difficult to remove. In order to remove such inclusions, it is effective to change the direction of the water flow.

  Therefore, an object of the present invention is to provide a water flow management system capable of freely changing the direction of the water flow in the water ring boring, and a water ring type underground tank provided with the water flow management system.

  In order to achieve the above object, a water flow management system according to the present invention is a water flow management system for controlling a water flow direction in a water ring boring formed underground and filled with water, and is provided at the mouth of the water ring boring. A packer to be installed, a first tube extending through the packer and extending into the water-sealed boring, and an opening at a position closer to the packer than the opening of the first tube through the packer And a water pressure adjusting means that is connected to the second pipe body and controls the water pressure thereof.

  Here, the water pressure adjusting means may include a vertical hole and a submersible pump for draining water in the vertical hole, and an end of the second tubular body may be connected to the vertical hole. In addition, the section of the vertical hole in which the submersible pump is disposed may have a sealed structure.

  Furthermore, in the location which penetrates the said packer, it can be set as the double pipe structure by which the said 1st pipe body was inserted inside the said 2nd pipe body. Moreover, it is preferable that it is the structure which connects a water supply pump to the said 1st pipe body.

  And the water-sealed underground tank of this invention was equipped with the above water flow management systems, It is characterized by the above-mentioned.

  In the water flow management system of the present invention configured as described above, the first tubular body and the second tubular body shorter than the first tubular body are extended inside the water-sealed boring, and the second tubular body is extended by the water pressure adjusting means. The water pressure can be changed.

  And when the water pressure of a 2nd pipe body is higher than the inside of a water seal boring, the flow of the water toward the outside from a water seal boring arises, and conversely the water pressure of a 2nd pipe body is lower than the inside of a water seal boring. Sometimes, the flow of water from the outside to the inside of the water-sealed boring is caused by the water flowing into the second tubular body.

  If the direction of the water flow in the water-sealed boring can be freely changed in this way, the water flow can be recovered by performing reverse cleaning when the water flow becomes worse.

  Further, by providing the vertical hole and the submersible pump that drains the water in the vertical hole, the water pressure of the second tubular body can be easily adjusted. Furthermore, the section of the vertical hole in which the submersible pump is arranged has a sealed structure using pipes, a bottom lid, a packer, etc., so that the water pressure of the second tubular body can be quickly changed with the operation of the submersible pump. Will be able to.

  Moreover, if it is a double pipe structure in which a 1st pipe body is inserted in the inside of a 2nd pipe body, the contact | adherence location of a packer and a pipe body will be one place, and it can simplify the water stop structure of a packer. it can.

  Furthermore, by connecting a water supply pump to the first pipe body, it becomes possible to force both water supply and drainage into the water-sealed boring, and increase the flow rate without excessively increasing the pipe pressure. be able to.

  And if it is a water-sealed underground tank equipped with such a water flow management system, it can be easily recovered even if the water-sealed boring is clogged, and it is possible to store liquefied petroleum gas etc. permanently. You can continue.

It is sectional drawing explaining the structure of the water flow management system of embodiment of this invention. It is a perspective view explaining the structure of the water-sealed underground tank of embodiment of this invention. It is explanatory drawing explaining each the direction which the water flows when a water flow management system is operated by the four methods.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 is a perspective view illustrating the configuration of the water-sealed underground tank 7 of the present embodiment.

  This water-sealed underground tank 7 constructs, for example, a horseshoe-shaped cavity in a cross-sectional bedrock, and stores a stored product such as liquefied petroleum gas therein. The bedrock for constructing the water-sealed underground tank 7 originally has a crack, and the water pressure around the water-sealed underground tank 7 is increased by supplying water to the crack.

  In order to supply water to the crack, a plurality of water-sealed borings 2 are provided around the water-sealed underground tank 7. This water-sealed boring 2 is constructed above the water-sealed underground tank 7 and from the inside of a water-sealed tunnel 21 constructed in parallel with the water-sealed underground tank 7.

  This water-sealed tunnel 21 is excavated in, for example, a horseshoe shape in a sectional view, and a plurality of water-sealed borings 2,. Here, the number and length of the water-sealed borings 2,... Are set in accordance with the state of the bedrock in which the water-sealed underground tank 7 is constructed and the amount of water to be supplied.

  Further, as shown in FIG. 1, the hole wall of the water-sealed boring 2 is not subjected to lining or the like, and the inside of the water-sealed boring 2 and the crack R,. ing.

  In FIG. 2, only one water-sealed tunnel 21 and a plurality of water-sealed borings 2,. In addition to this, a water-sealed tunnel 21 and a water-sealed boring 2 are constructed around the underground tank 7.

  Then, the water flow management system 1 is installed through the water seal tunnel 21. Here, for the sake of explanation, the water flow management system 1 is illustrated as being installed only on one water ring boring 2, but the water flow management system 1 is also installed on other water ring borings 2,. .

  FIG. 1 is a cross-sectional view illustrating the overall configuration of the water flow management system 1.

  This water flow management system 1 includes a packer 3 installed at the mouth of a water-sealed boring 2, a water supply pipe 4 as a first pipe extending through the packer 3 and extending into the water-sealed boring 2, and a packer 3 is provided with a drain pipe 5 as a second tubular body extending through the water-sealed boring 2 and a water pressure adjusting means 6 connected to the drain pipe 5 and controlling the water pressure.

  This packer 3 is comprised by the bag body with two through-holes, and the filler with which the inside of the bag body is filled, for example. That is, the bag body is inflated by filling the inside of the bag body with a fluid filler such as water or cement milk, and is closely attached to the outer peripheral surface of the water supply pipe 4 and the drain pipe 5 and the hole wall of the water seal boring 2. To form a water-stop structure. That is, the water supply pipe 4 and the drain pipe 5 are piped in parallel at a portion penetrating the packer 3, and the expanded packer 3 is interposed between the gap and the hole wall.

  Furthermore, the opening 5 a of the drain pipe 5 is located immediately below the packer 3, but the water supply pipe 4 projects downward from the opening 5 a until the opening 4 a is located near the bottom surface of the water seal boring 2. It is extended. That is, the opening 5 a of the drain pipe 5 is arranged at a position closer to the packer 3 than the opening 4 a of the water supply pipe 4.

  Since the difference between the position of the opening 5a of the drain pipe 5 and the position of the opening 4a of the water supply pipe 4 is a water pressure difference that is allowed for both, the relative positional relationship is appropriately set according to the desired configuration. Adjust.

  The water supply pipe 4 extends from the working tunnel or a shaft (not shown) through the inside of the water seal tunnel 21 to the ground and is connected to the water supply tank 43. A water supply pump 41 and a valve 42 are disposed between the water supply tank 43 and the water supply pipe 4.

  This water supply pump 41 is a pressure feed pump that forcibly sends the water in the water supply tank 43 toward the water-sealed boring 2. Further, the supply amount or stoppage of water supply to the water-sealed boring 2 can be adjusted by opening and closing the valve 42.

  On the other hand, the drain pipe 5 extends laterally inside the water seal tunnel 21 and is connected to the water pressure adjusting means 6.

  The water pressure adjusting means 6 has a drain well 61 as a vertical hole and a drain pump 62 as a submersible pump for adjusting the water level 6 a of the drain well 61.

  The drain well 61 has an upper end open to the ground surface and a lower end formed inside the water seal tunnel 21. In addition, a casing pipe 61a having a bottom cover 61b is inserted into the drain well 61, and a water-blocking structure in which water does not flow from the outside except the drain pipe 5 is provided.

  Furthermore, the drainage pump 62 disposed inside the drainage well 61 is a suction pump that reduces the internal pressure and sucks up water, and is connected to a pumping pipe 62a that transports the sucked-in water. The pumping pipe 62 a extends inside the drain well 61 and protrudes from the upper end of the drain well 61.

  Moreover, the lower part of the drainage well 61 is connected to the edge part of the drainage pipe 5 in the connection part 5b. For this reason, when the drain pump 62 is not operated, the water level 6a of the drain well 61 reflects the water pressure of the drain pipe 5 as it is.

  Next, the operation of the water flow management system 1 of the present embodiment will be described with reference to FIG.

  FIG. 3A is a view for explaining the flow of water at the normal time when water is supplied to the rock by the water ring boring 2.

  In this normal time, the water supply pump 41 is stopped and the valve 42 is fully opened. For this reason, water pressure based on the difference from the water surface of the water supply tank 43 acts on the opening 4 a of the water supply pipe 4, and natural outflow into the water ring boring 2 occurs.

  And the water which flowed into the inside of the water-sealed boring 2 will flow out into the bedrock through the cracks R,. When the water pressure inside the cracks R,... Increases and the water pressure difference from the inside of the water-sealed boring 2 decreases, this outflow also decreases.

  Next, FIG. 3B is a diagram for explaining the flow of water when only the feed pump 41 is operated.

  In this case, water to which pressure is applied by the water supply pump 41 is sent through the water supply pipe 4 and discharged from the opening 4a, and accordingly, the internal pressure of the water seal boring 2 also increases from the normal time.

  Further, the amount of water flowing out from the cracks R,... To the rock is also increased compared to the normal time if the cracks R are not clogged. Furthermore, the water inside the water-sealed boring 2 flows into the opening 5 a of the drain pipe 5 and is sent to the drain well 61.

  Then, by collecting the water flowing into the drain well 61 and conducting a water quality survey, it is possible to confirm the breeding status of bacteria in the water-sealed boring 2 and the scale generation status.

  Here, due to the results of the water quality survey conducted in this way and the decrease in the amount of water supply during normal times, inclusions S such as scales, gravel and clay are cracked R as shown in FIG. In some cases, it can be estimated that clogging occurs due to deposits on the wall, or inclusions S adhering to the hole walls and blocking the entrance to the crack R. In such a case, cleaning is performed to remove the inclusion S from the crack R and the wall surface.

  In performing this cleaning, first, the valve 42 is closed to stop the supply of water from the water supply pipe 4. In this state, the drain pump 62 is operated to suck up water from the drain well 61.

  Then, the water level 6a of the drainage well 61 is lowered, and accordingly, the water pressure around the connection portion 5b of the drainage pipe 5 is lowered, and the water in the drainage pipe 5 increases in flow velocity and flows into the drainage well 61. . And the water pressure of the opening 5a of the drain pipe 5 in the water seal boring 2 also falls by the flow of the drain pipe 5 generated in this way, and the water in the water seal boring 2 as shown in FIG. 3 (c). Will flow into the opening 5a.

  The flow of water in the direction opposite to the normal time generated in this way has an action of peeling off the inclusions S attached to the hole wall of the water-sealed boring 2. Further, the flow of water in the reverse direction propagates through the cracks R,..., And some inclusions S are pushed out of the crack R and released into the water ring boring 2 along the water flow. It will be.

  Further, the inclusion S pushed out from the cracks R in this way is taken from the opening 5 a and discharged to the drain well 61 through the drain pipe 5.

  On the other hand, when it is desired to remove the inclusions S by increasing the speed of the water flow, the valve 42 is opened and the water supply pump 41 is operated as shown in FIG. Then, the amount of water supplied to the inside of the water-sealed boring 2 increases, and the water in the water-sealed boring 2 flows into the opening 5a so as to be pushed out.

  In this case, since the pushing force of the water supply pump 41 is added to the suction force of the drainage pump 62, the flow velocity in the water seal boring 2 becomes maximum. The inclusions S,... Released in this fast flow are successively taken into the opening 5a and discharged from the drain pipe 5.

  In addition, the water-sealed boring 2 from which the inclusions S,... Of the cracks R,... Have been removed by reverse cleaning in this manner is returned to the state of FIG. Used as water-sealed boring 2

  In the water flow management system 1 according to the present embodiment configured as described above, a water supply pipe 4 and a drain pipe 5 shorter than the water pipe 4 are extended inside the water-sealed boring 2. The water pressure of 5 can be changed.

  When the water pressure in the drain pipe 5 is higher than that in the water ring boring 2, water flows from the inside to the outside of the water ring boring 2, and conversely, the water pressure in the drain pipe 5 is higher than in the water ring boring 2. When the temperature is low, the water flows into the drain pipe 5 to cause a water flow from the outside to the inside of the water-sealed boring 2.

  Thus, if the direction of the water flow in the water-sealed boring 2 can be freely changed, the inclusion S clogged in the crack R by the flow in one direction can be removed by the flow in the reverse direction. That is, when the amount of water supplied from the water-sealed boring 2 to the bedrock decreases and the flow of water becomes worse, the water flow can be recovered by performing reverse cleaning on the water-sealed boring 2. .

  Moreover, the water level 6a of the drain well 61 can be easily changed by providing the drain well 61 and the drain pump 62 which drains the water of the drain well 61. And if the water level 6a of the drain well 61 changes, since the water pressure of the drain pipe 5 connected to it will also change, the water pressure of the drain pipe 5 can be adjusted easily.

  Further, the drainage well 61 in which the drainage pump 62 is disposed has a peripheral surface formed of a casing pipe 61a and has a bottom cover 61b. Can be directly connected to a decrease in the water pressure of the drain pipe 5.

  In addition, if the drain pipe 5 and the drain well 61 connected to the drain pipe 5 and extending to the ground are provided, the path of the water supply pipe 4 is blocked, or the water supply pump 41 breaks down, resulting in trouble with water supply. Even in such a case, water can be supplied from the drain pipe 5 into the water-sealed boring 2 and the water supply can be continued.

  Furthermore, by connecting the water supply pump 41 to the water supply pipe 4, water can be forcibly supplied into the water-sealed boring 2. Moreover, by carrying out together with the drainage from the drainage pipe 5 using the drainage pump 62, it becomes possible to forcibly generate a water flow at both the inlet and the outlet, and the flow velocity in the water seal boring 2 is reduced. Can be increased.

  In particular, even if clogging occurs, if only the pressure of the feed pump 41 is increased in order to increase the amount of drainage, the pipe pressure of the feed pipe 4 may increase and be damaged. By providing the pumps (41, 62) on both the outlet sides, the flow velocity can be increased without increasing the pipe pressure of the water supply pipe 4 and the drain pipe 5.

  Further, if the flow rate of the water-sealed boring 2 can be increased, not only the inclusion S adhered to the wall surface and the inclusion S sandwiched between the cracks R but also the deposits deposited on the bottom of the water-sealed boring 2 can be removed. become able to.

  And if it is a water-sealed underground tank 7 equipped with such a water flow management system 1, even if the water-sealed boring 2 is clogged and the amount of supplied water decreases, the direction of the water flow is changed and backwashing is performed. Since the supply amount can be easily recovered, the water-sealed underground tank 7 can be used permanently.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  For example, in the above-described embodiment, the configuration in which the water supply pump 41 is connected to the water supply pipe 4 has been described. However, the configuration is not limited thereto, and a configuration without the water supply pump 41 may be used. Further, the upper end of the water supply pipe 4 is not necessarily provided on the ground.

  Moreover, in the said embodiment, although the drainage well 61 was made into the water-impervious structure by the casing pipe 61a and the bottom cover 61b, in addition to this, the packer for wells (not shown) is arrange | positioned in the middle of the drainage well 61 And the area | region where the drainage pump 62 is arrange | positioned can be made into a sealing structure by plugging up the clearance gap between the pumping pipe 62a and the internal peripheral surface of the casing pipe 61a.

  By connecting the drain pipe 5 to the section having such a sealed structure, the suction efficiency of the drain pump 62 is improved, and the water pressure in the drain pipe 5 can be quickly reduced. Further, if the suction force of the drainage pump 62 is increased, the inclusion S and the deposits can be removed in large quantities by causing a swab in the water-sealed boring 2.

  Furthermore, in the said embodiment, although the water pressure adjustment means 6 was comprised by the drain well 61 and the drain pump 62, it is not limited to this, For example, the edge part of the drain pipe 5 is directly connected to a vacuum pump, etc. Thus, the drain well 61 may not be provided.

  Moreover, in the said embodiment, although it has the structure which penetrates the packer 3 in the state in which the water supply pipe 4 and the drain pipe 5 were located in parallel, it is not limited to this, In the location which penetrates a packer, A double pipe structure in which the pipe is an outer pipe and the water supply pipe is an inner pipe can also be used. In such a double pipe structure, only the drainage pipe is exposed at the mouth of the water-sealed boring 2 and the close contact portion between the packer and the drainage pipe becomes a simple circle, so an annular packer 3 is used. This can simplify the water stop structure.

  And the water flow management system 1 of this invention is not limited to what is applied to the water-sealed underground tank 7 demonstrated in the said embodiment. For example, the water flow management system 1 of the present invention can be applied to a water-sealed boring 2 provided for water intake. In this case, the direction of the water flow at the normal time and at the time of washing is opposite to the case where the water flow is applied to the water-sealed underground tank 7.

1 Water flow management system 2 Water-sealed boring 3 Packer 4 Water supply pipe (first pipe)
4a Opening 41 Water supply pump 5 Drain pipe (second pipe)
5a Opening 6 Water pressure adjusting means 61 Drainage well (vertical hole)
62 Drainage pump (submersible pump)
7 Water-sealed underground tank

Claims (6)

A water flow management system that controls the direction of water flow in a water-sealed boring formed underground and filled with water,
A packer installed at the mouth of the water-sealed bowling;
A first pipe extending through the packer and extending into the water-sealed boring;
A second tube having an opening located at a position closer to the packer than the opening of the first tube through the packer;
A water flow management system comprising a water pressure adjusting means connected to the second pipe body and controlling a water pressure of the second pipe body .   2. The water flow according to claim 1, wherein the water pressure adjusting means includes a vertical hole and a submersible pump that drains water in the vertical hole, and an end of the second tubular body is connected to the vertical hole. Management system.   The water flow management system according to claim 2, wherein a section of the vertical hole in which the submersible pump is disposed has a sealed structure.   The water flow according to any one of claims 1 to 3, wherein the portion that penetrates the packer has a double tube structure in which the first tube is inserted into the second tube. Management system.   The water flow management system according to any one of claims 1 to 4, wherein a water supply pump is connected to the first pipe body.   A water-sealed underground tank comprising the water flow management system according to any one of claims 1 to 5.

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