JP3555046B2 - Bedrock groundwater intake facility - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a rock groundwater intake facility capable of suitably taking rock groundwater flowing through the rock.
[0002]
[Prior art]
Currently, water resources used for drinking water, industrial water, agricultural water, and the like are mainly provided by water from natural waters such as rivers and lakes, water from dams, and groundwater pumping in soil. However, in recent years, the number of locations suitable for the construction of river and lake water intake facilities and dams has decreased, making it difficult to withdraw water from natural water bodies such as rivers and lakes. In this case, water intake is being restricted due to problems such as lowering of groundwater level in soil and land subsidence. Therefore, it is becoming difficult to secure water resources.
[0003]
Therefore, methods for securing new water resources are being sought, one of which is a desalination plant. According to this desalination plant, it is possible to secure inexhaustible water resources from seawater.
[0004]
[Problems to be solved by the invention]
However, desalination plants have high facility costs and operating costs, and are not currently widely used.
[0005]
Therefore, the present inventors have considered a rock groundwater intake facility for inexpensively and efficiently taking groundwater flowing in rock that has not been used yet, that is, rock groundwater. The rock groundwater is, for example, spring water generated when a tunnel is excavated and formed in the rock, and no special water intake device for effectively using the spring water has been proposed. Drainage boring used for spring water countermeasures during construction works for taking groundwater from the bedrock is different from the present invention in that it is a temporary facility and has a low water intake efficiency.
[0006]
In addition, it is necessary to prevent salinization when taking water from the seashore where the location is good.However, conventional methods for preventing salinization only consider a method using surface boring on soil ground. In this way, it is difficult to prevent salinization of rock groundwater. It is also conceivable to provide a water barrier between the rock collection facility and the sea area.However, it is difficult to provide a large water barrier in the deep rock under the ground, and enormous construction cost is required. There is a problem that it costs.
[0007]
In addition, for example, in the case of water intake from high-permeability rock that is advantageous for groundwater intake, there is a possibility that the groundwater level may drop particularly during the drought period. Lowering the groundwater level not only impairs the groundwater environment, but also lowers the water intake itself. Therefore, there is a problem that it becomes difficult to supply water resources during a drought period when demand for water resources increases.
[0008]
In view of the above circumstances, the present invention can perform inexpensive and efficient water intake, and can prevent salt water in water intake from the seashore, Another object of the present invention is to provide a rock groundwater intake facility capable of supplying water resources.
[0009]
[Means for Solving the Problems]
The rock groundwater intake facility according to claim 1 is formed in the rock and descends toward the catchment section. A large number of water collection holes are formed on the wall toward the rock, and a communication tunnel that connects to the ground is connected. A water collecting tunnel, a water storage tank formed in the water collecting part, and a pumping means for lifting rocky groundwater stored in the water storage tank to the ground. Set up on the waterfront Bedrock groundwater intake facility A salinization prevention hole formed on the sea side of the water collection tunnel, a water injection pipe inserted into the salt water prevention hole, and an end of the water injection pipe attached to an end of the water injection pipe. Recharge water supply means, comprising a packer for forming a water injection space, and supplying recharge water to the water injection space of the salt preventing hole. And characterized in that:
[0013]
Claim 2 The rock groundwater intake facility described in the claim 1 Rock groundwater intake facility described in At And a water intake stopping device for opening and closing the water collecting tunnel.
[0014]
Claim 3 The rock groundwater intake facility described is Claim 1 or 2 Bedrock groundwater intake facility At And a water intake stopping device for opening and closing the water collecting hole.
[0015]
Claim 4 The rock groundwater intake facility described is Claim 2 or 3 Bedrock groundwater intake facility At , Formed in the bedrock upstream of the groundwater flow from the catchment tunnel, Via recharge water supply means A condensate injection hole for charging water A plug constituting recharge water supply means is provided at an open end of the condensate injection hole to form an injection space. It is characterized by the following.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The rock groundwater intake facility 500 according to the first embodiment of the present invention is located at the waterfront 1 as shown in FIG. 2, and the rock groundwater intake facility 500 communicates with the water intake facility 100 as shown in FIG. It comprises a tunnel 200 and groundwater salinization prevention equipment 300.
[0017]
The water intake facility 100 includes a water collecting tunnel 10 formed in the rock 3, a large number of water collecting holes 20 formed on the wall surface 11 of the water collecting tunnel 10 toward the rock 3, and a lower part of the water collecting tunnel 10. The water storage unit 30 includes a water storage tank 30 depressed and formed in the water collecting unit 13, and a water pumping device 40 as a water pumping means for lifting the rock groundwater Wa stored in the water storage tank 30 to the ground.
[0018]
The communication tunnel 200 is a shaft formed immediately above the water storage tank 30, and the upper end thereof penetrates the soil ground 2 and opens to the ground. The lower end of the communication tunnel 200 is connected to the water collecting part 13 of the water collecting tunnel 10. In the present embodiment, the connecting tunnel 200 is a shaft, but may be an inclined shaft or the like, and the connecting tunnel 200 is not necessarily a collecting tunnel of the collecting tunnel 10 as long as the connecting tunnel 200 is connected to the collecting tunnel 10. It does not need to be connected to the water part 13.
[0019]
The water pumping device 40 includes a water pumping pipe 41 provided on the ground from the water storage tank 30 via the communication tunnel 200, and a pump 43 for lifting the rock groundwater Wa stored in the water storage tank 30 to the ground through the water pumping pipe 41. ing.
[0020]
The water collecting tunnel 10 is formed along the coastline L as shown in FIG. 3 and substantially horizontally as shown in FIG. 1, and the bottom 12 of the wall surface 11 is inclined slightly downward toward the water storage tank 30. It is formed. The cross-sectional shape of the water collecting tunnel 10 is substantially rectangular in the present embodiment as shown in FIG. 2, but may be arch-shaped or the like. The bottom part 12 of the water collecting tunnel 10 has groove-shaped water conduits 12a, 12a on both side edges thereof, and the water conduits 12a, 12a are separated from one end of the water collecting tunnel 10 as shown in FIG. It is formed over the end and is slightly downwardly inclined toward the water tank 30. Further, the water collecting tunnel 10 has a sufficient cross-sectional area for carrying in a work for carrying in a drilling machine and drilling the water collecting hole 20. This cross section is a cross section orthogonal to the tunnel axis of the water collection tunnel 10.
[0021]
As shown in FIG. 2, a large number of water collecting holes 20 formed in the wall surface 11 of the water collecting tunnel 10 are formed toward the inland side (the left side in FIG. 2), and are formed substantially horizontally in the present embodiment. And those formed obliquely upward. As shown in FIG. 1, a large number of the water collecting holes 20 are formed continuously along the tunnel axis of the water collecting tunnel 10.
[0022]
On the other hand, as shown in FIG. 2, the groundwater salinization prevention equipment 300 includes a large number of saltwater prevention holes 310 formed from the wall surface 11 of the water collection tunnel 10 toward the sea Se, and as shown in FIG. Recharge water supply means 320 for supplying the recharge water Wb to the oxidation prevention hole 310.
[0023]
Each of the salinization prevention holes 310 is formed horizontally toward the sea Se as shown in FIG. 2 and is continuously provided along the tunnel axis of the water collection tunnel 11 as shown in FIG.
[0024]
As shown in FIG. 1, the recharge water supply means 320 is introduced into the water collection tunnel 10 from the ground through the communication tunnel 200, and its end is branched into a large number and inserted into each of the salt-water preventing holes 310 shown in FIG. A water injection pipe 321, a packer 322 attached to each end of the water injection pipe 321 and forming a water injection space S <b> 1 at an end of each of the salt water preventing holes 310, and a water injection pipe 321 installed on the ground as shown in FIG. And a water quality adjustment tank 324 for adjusting the quality of the recharged water Wb fed to the water injection pipe 321. The recharged water Wb is assumed to be sewage treated water that can be supplied in large quantities at low cost, rainwater in the surrounding area, and the like. The water quality adjustment tank 324 includes a chlorine-based recharged water Wb for filtering or treating organic substances. Water quality is adjusted by treatment.
[0025]
Since the rock groundwater intake facility 500 has the above-described configuration, the rock groundwater Wa is first obtained as natural spring water generated on the wall surface 11 of the water collecting tunnel 10 formed in the rock 3 and the water collecting holes 20. be able to. At this time, the exposed area of the rock surface is increased by the large number of water collecting holes 20, so that the rock groundwater Wa can be more efficiently taken. In other words, the drilling work of each water collecting hole 20 is easy because the hole diameter can be small, and in addition to the case where the exposed area of the rock surface is increased to the same extent by expanding or extending the water collecting tunnel 10. Since the amount of excavation of the rock 3 can be reduced, the construction can be further facilitated, and the construction cost can be reduced.
[0026]
The rock groundwater Wa generated in the wall surface 11 of the water collecting tunnel 10 formed in the rock 3 and each water collecting hole 20 naturally flows down the headrace channels 12a, 12a of the water collecting tunnel 10 and is collected in the water storage tank 30. Can be As a result, the power for collecting the rock groundwater Wa is omitted, and the operation cost is reduced.
[0027]
The rock groundwater Wa collected in the water storage tank 30 can lift the rock groundwater Wa from the water storage tank 30 to the ground by the water pumping device 40.
[0028]
That is, in the rock groundwater intake facility 500, the construction cost can be reduced by taking water through the large number of water collection holes 20, and the operation cost can be reduced by collecting the rock groundwater Wa by natural flow. It is possible to perform a typical water intake.
[0029]
By the way, in general, the use of rock groundwater has an advantage that the influence on the groundwater environment is smaller than the use of groundwater in the soil ground 2 shown in FIG. The water level and pressure in the inside may decrease. In particular, when it is located on a highly permeable bed 3 which is advantageous for groundwater intake, it is expected that the water level and water pressure will be greatly reduced. If the water level and water pressure decrease, the water intake itself will decrease and the original function of the facility will be impaired, and in the case of one seaside location, seawater Wc will infiltrate the rock groundwater Wa and salinization of the groundwater will occur. Causes environmental degradation and impaired groundwater use.
[0030]
The groundwater salinization prevention equipment 300 of the bedrock groundwater intake facility 500 overcomes the above-mentioned problem of groundwater salinization. That is, in the underground water salinization prevention equipment 300, as shown in FIG. 1, first, the recharged water Wb is adjusted in water quality in a water quality adjustment tank 324 provided on the ground. As a result, sewage treatment water and rainwater in the surrounding area can be used, so that a large amount of low-cost recharge water Wb can be supplied.
[0031]
Next, the recharged water Wb whose water quality has been adjusted is pressurized by the pressurizing device 323 and circulated through the water injection pipe 321. The water injection pipe 321 is introduced into the water collecting tunnel 10 through the connecting tunnel 200, and its end is inserted into a salt water preventing hole 310 continuously provided on the sea Se side of the water collecting tunnel 10, as shown in FIG. As described above, the end of the seawater prevention hole 310 on the sea Se side communicates with the water injection space S1 formed by the packer 322. Therefore, the recharge water Wb is injected from the water injection space S1 into the rock 3 toward the sea Se. Since the groundwater pressure on the sea Se side of the water collection tunnel 10 can be increased by the recharge water Wb, the penetration of the seawater Wc into the water collection tunnel 10 can be prevented. Thereby, the salt water of the bedrock groundwater Wa taken in by the water collecting tunnel 10 and the water collecting hole 20 formed in the inland side of the water collecting tunnel 10 can be prevented.
[0032]
Further, in the present embodiment, since the water injection space S1 is provided at a position separated from the water collecting tunnel 10 toward the sea Se, the permeation of the seawater Se is prevented more on the sea Se side than the water collecting tunnel 10. be able to. The water injection space S1 is provided along the coastline L so as to separate the water collecting tunnel 10 and the sea Se as shown in FIG. Further, a water collecting hole 20 shown in FIG. 2 is formed on the inland side of the water collecting tunnel 10. Therefore, since penetration of the seawater Wc into the water collecting tunnel 10 and the water collecting hole 20 side is made more difficult, it is possible to more reliably prevent salt water from being salted.
[0033]
Further, a part of the recharge water Wb injected from the water injection space S1 penetrates into the water collection tunnel 10, but the water injection space S1 is provided at a position separated from the water collection tunnel 10 toward the sea Se as described above. Therefore, the amount of the recharge water Wb taken in the water collecting tunnel 10 and the water collecting hole 20 can be reduced. The recharge water Wb taken in the water collection tunnel 10 and the water collection hole 20 is adjusted in water quality, and is naturally purified in the process of flowing through the rock 3, so that the water quality of the rock groundwater Wa taken is taken. Can be maintained at a high quality.
[0034]
By the way, the pressurizing device 323 of the above embodiment is for feeding the recharged water Wb to the water injection space S1 at a pressure higher than the seawater Wc in the rock 3, but if it is possible to send water at the same pressure. Instead of using the pressurizing device 323, the structure may be such that water is supplied with potential energy by natural flow. In addition, when the quality of the recharge water Wb to be used is good, the water quality adjusting tank 324 is not necessarily required.
[0035]
FIGS. 4, 5, and 6 are a vertical sectional view, a cross-sectional view, and a plan view showing a rock groundwater intake facility according to a second embodiment of the present invention. In the groundwater intake facility 500, the groundwater salinization prevention equipment 300 is replaced with a groundwater salinization prevention equipment 600 that can more reliably prevent salinization.
[0036]
The groundwater salinization prevention equipment 600 is different from the groundwater salinization prevention equipment 300 of the first embodiment shown in FIG. 2 in that the saltwater prevention hole 310 and the packer 322 are used instead of the salinization prevention tunnel 300 as shown in FIG. 610, a plug 620 serving as a recharge water supply means, and a saltwater prevention hole 630.
[0037]
The salinization prevention tunnel 610 is formed substantially horizontally from the water collecting tunnel 10 to the sea Se side, and has a sufficient crossing to carry in a drilling machine and drill a salination prevention hole 630 described later. Has an area. This cross section is a cross section orthogonal to the tunnel axis of the saltwater prevention tunnel 610. In addition, a plurality of salinization prevention tunnels 610 are provided continuously along the tunnel axis of the water collection tunnel 10. A water injection space S2 is formed at an end of the saltwater prevention tunnel 610 on the sea Se side by a plug 620, and the water injection space S2 is formed above and below the water injection space S2 as shown in FIGS. Saline prevention holes 630, 630, 630, 630 are formed on both sides of the tunnel 10 parallel to the tunnel axis. Further, the end of the water injection pipe 321 is branched into a plurality of parts as shown in FIG. 4 and inserted into the respective salt-water preventing tunnels 610, 610, and connected to the water injection spaces S2, S2 through the plug 620 of FIG. Have been. In addition, in this embodiment, although the number of the saltwater prevention tunnels 610 and 610 is two as shown in FIG. 6, it is needless to say that three or more tunnels may be used. Further, as shown in FIG. 5, a waterproof treatment 650 is applied to the section of the salinization prevention tunnel 610 closer to the water collecting tunnel 10 than the plug 620. This is to prevent the recharge water Wb injected into the rock 3 from the water injection space S2 and the salt-prevention hole 630 from flowing into the salt-prevention tunnel 610 without being purified in the rock 3 and In other words, the penetration length of the bedrock 3 that exerts the water purification function is ensured.
[0038]
Therefore, in the present embodiment, the recharged water Wb supplied to the water injection space S2 through the water injection pipe 321 is supplied to the water injection space S2 and the upper and lower sides from the water injection space S2 and to both sides parallel to the tunnel axis of the water collection tunnel 10. Water is injected into the bedrock 3 through the formed saltwater prevention holes 630, 630, 630, 630, respectively. Therefore, compared to the first embodiment, the recharge water Wb can be injected into the bed 3 between the sea Se and the water collection tunnel 10 at high density and in a wide range. As a result, salt water can be more reliably prevented.
[0039]
In the special case where the bedrock 3 is exposed on the ground and the end of the water collecting tunnel 10 can be used as a wellhead exposed on the ground, it is not always necessary to provide the communication tunnel 200.
[0040]
Further, the water collecting hole 20 may not be provided and the water collecting tunnel 10 may be configured to take water.
[0041]
7 and 8 are a longitudinal sectional view and a transverse sectional view, respectively, showing a third embodiment of the rock groundwater intake facility of the present invention. The rock groundwater intake facility 1300 is similar to the rock groundwater intake facility of the first embodiment shown in FIG. In the facility 500, a water intake stop device 1100 and a condensate facility 1200 are provided as shown in FIG. 7 in order to prevent a decrease in the groundwater level at the time of drought. In this embodiment, the groundwater salinization prevention equipment 300 of the first embodiment shown in FIG. 1 is omitted, but a configuration having the groundwater salinization prevention equipment 300 may be adopted.
[0042]
As shown in FIG. 7, the water intake stop device 1100 is installed at the open end of each water collecting hole 20 and a valve 1110 that opens and closes the open end, and a valve 1110 that is provided on the ground and controls the opening and closing of the valve 1110. It comprises a control mechanism (not shown).
[0043]
Also, as shown in FIG. 8, the condensing equipment 1200 is a condensing water formed substantially horizontally in the rock 3 on the upstream side (in the direction of arrow A in FIG. 8) of the flow of the rock groundwater Wa from the tunnel wall of the communication tunnel 200. The rechargeable water supply means 1220 is provided at an open end of the condensate injection hole 1210, and has a plug 1222 forming an injection space S3 and one end having a plug 1222. And a water injection pipe 1224 whose other end is disposed on the ground via the communication tunnel 200 and a pressurizing device 1226 which is installed on the ground and pressure-feeds the recharge water Wd to the water injection pipe 1224. And a water quality adjusting device 1228 for adjusting the water quality of the recharge water Wd pumped to the water injection pipe 1224.
[0044]
As the recharge water Wd, sewage treatment water that can be supplied in large quantities at low cost, rainwater in the surrounding area, and the like are assumed, and the water quality adjustment device 1228 is installed as necessary when using recharge water with poor water quality. The recharged water Wd is subjected to water quality adjustment by filtration or chlorine-based treatment for the purpose of treating organic substances. The pressurizing device 1226 and the plug 1222 can also be omitted when supplying the recharge water Wd under natural flow.
[0045]
In the case where the groundwater salinization prevention equipment 300 of the first embodiment shown in FIG. 1 is provided, the water injection pipe 321 of the recharged water supply means 320 is branched and penetrated through the plug 1222 to be introduced into the injection space S3. It is also conceivable to omit components other than the plug 1222 of the recharge water supply means 1220 in FIG. However, in that case, it is desirable that the recharge water Wc used in the groundwater salinization prevention equipment 300 be further purified.
[0046]
Therefore, in this embodiment, if the groundwater level has dropped during normal times, the valve 1110 can be closed to stop water intake, and the groundwater level can be maintained and restored. Further, at this time, if the recharge water Wd is injected into the upstream side of the flow of the rock groundwater Wa shown in FIG. 8 by the condensing equipment 1200, the recovery of the groundwater level can be further promoted. As a result, it is possible to secure water intake capacity during the drought season. Therefore, water resources can be supplied even during the drought period.
[0047]
Also, during the drought period, the condensing equipment 1200 may be operated to mitigate the decrease in the water intake due to the decrease in the water level. By easing the decrease in the groundwater level during the drought period as described above, Recovery of the groundwater environment after the drought period can be facilitated.
[0048]
In the present embodiment, it is considered that spring water from the wall surface 11 of the water collecting tunnel 10 shown in FIG. 7 is small, and a water stop device for the wall surface 11 is not shown. Alternatively, the structure may be such that water is stopped only at a location where there is much spring water. In addition, in the present embodiment, since the case where the groundwater salinization prevention equipment 300 is not required is considered, the water collecting hole 20 is provided in the water collecting tunnel 10 also on the downstream side of the rock groundwater Wa as shown in FIG. I have.
[0049]
FIGS. 9 and 10 are a longitudinal sectional view and a transverse sectional view, respectively, showing a rock groundwater intake facility according to a fourth embodiment of the present invention. The rock groundwater intake facility 1600 according to the third embodiment shown in FIG. In 1300, a water intake stopping device 1400 for opening and closing the water collecting tunnel 10 is provided at the open end of the water collecting tunnel 10 as shown in FIG. Things. This water intake stop device 1100 is provided at the open end of the water collection tunnel 10 and has a water stop wall 1410 forming a water intake space S4, and one end penetrates the water stop wall 1410 and is introduced into the water intake space S4. A drain pipe 1420 having an end disposed on the water tank 30 side, a valve 1430 provided at the other end of the drain pipe 1420 to open and close the drain pipe 1420, and a control mechanism (not shown) installed on the ground and controlling opening and closing of the valve 1430 It consists of
[0050]
Further, in the rock groundwater intake facility 1300 of the third embodiment of FIG. 8, the condensate injection hole 1210 is provided in the pit wall of the communication tunnel 200, but in the rock groundwater intake facility 1600 of the present embodiment, Instead of the water injection hole 1210, as shown in FIG. 10, the water injection hole 1210 was formed independently from the communication tunnel 200 and was formed from the ground toward the rock 3 on the upstream side of the flow of the rock groundwater Wa from the water collection tunnel 10. A condensate water injection hole 1510 is provided to constitute a condensate condensing equipment 1500.
[0051]
Therefore, in the present embodiment, in addition to achieving the same effects as the third embodiment, the intake space S4 including the inside of the water collecting hole 20 and the inside of the water collecting tunnel 10 can be closed, so that the rock groundwater intake facility 1600 The rock groundwater Wa accumulated in the water storage tank 30 can be further reduced. That is, the water intake can be stopped more strictly, and the groundwater level can be recovered more quickly.
[0052]
11 and 12 are a vertical sectional view and a horizontal sectional view showing a fifth embodiment of the rock groundwater intake facility of the present invention. The rock groundwater intake facility 1900 is a rock groundwater intake facility of the third embodiment of FIG. At 1300, the water collecting tunnel 10 and the water collecting hole 20 are abolished, and the communication tunnel 200 is also used as the water collecting tunnel as shown in FIG. It is formed toward the bedrock 3. The water collecting hole 1920 extends in the direction orthogonal to the flow of the rock groundwater Wd in FIG. 12 in consideration of the water collecting efficiency, and the open end of the water collecting hole 1920 is similar to the third embodiment. Is provided with a valve 1110.
[0053]
Therefore, according to the present embodiment, the same effects as those of the third embodiment can be obtained. Further, since the formation of the water collecting tunnel 10 can be omitted, the construction of the facility can be speeded up.
[0054]
【The invention's effect】
According to the rock groundwater intake facility of claim 1, by forming a water collection tunnel in the rock, rock groundwater in the rock can be obtained from the wall surface thereof, and the rock groundwater is collected by the water collection tank by the water collection tunnel. Can be stored. Then, rock groundwater can be lifted from the water tank to the ground by the pumping means. Therefore, since the rock groundwater can be efficiently collected into the water storage tank without power, the operation cost can be reduced. Therefore, efficient water intake can be performed at low cost.
[0055]
Also, Since a large number of water collecting holes are formed in the wall of the water collecting tunnel toward the rock, the exposed area of the rock surface is efficiently increased with a small excavation amount. Therefore, simplification of construction can be achieved and construction cost can be reduced.
[0056]
In addition, the communication tunnel to the ground will be connected In places where the rock is not exposed to the ground and the water collection tunnel does not open to the ground, it functions as a carry-in / out port for various equipment such as drilling machines and as an entrance for workers during construction. Facilitates the maintenance of intake facilities.
[0057]
Also, By injecting and supplying recharged water to the salinization prevention holes, the pressure of freshwater groundwater in the bedrock on the sea side of the catchment tunnel can be further increased than the pressure of seawater groundwater existing on the seaside. The inflow of seawater into the water tunnel can be prevented, and the salinization of rocky groundwater taken in can be prevented.
[0058]
Claim 2 According to the described bedrock groundwater intake facility, in addition to the above-mentioned effects, in normal times, if the groundwater level has been reduced, the intake tunnel can be closed and the intake stopped by the intake stop device. Can be retained and recovered. Therefore, it is possible to secure the water intake capacity during the drought season, so that water resources can be supplied even during the drought season.
[0059]
Claim 3 According to the described rocky groundwater intake facility, in addition to the above-mentioned effects, in normal times, if the groundwater level has dropped, the intake stoppage device can close each water intake hole to stop the intake. Can be maintained and recovered. Therefore, it is possible to secure the water intake capacity during the drought season, so that water resources can be supplied even during the drought season.
[0060]
Claim 4 According to the described rocky groundwater intake facility, in addition to the above effects, when the groundwater level drops during normal times and the intake is stopped, recharge water flows from the condensate injection hole upstream of the groundwater flow from the collection tunnel. The groundwater level can be recovered more quickly because it can be injected and supplied into the bedrock. Therefore, it is possible to more reliably secure the water intake capacity during the drought season, and it is possible to supply water resources even during the drought season.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of a rock groundwater intake facility of the present invention.
FIG. 2 is a cross-sectional view of the bedrock groundwater intake facility of FIG. 1;
FIG. 3 is a plan view of the bedrock groundwater intake facility of FIG. 1;
FIG. 4 is a longitudinal sectional view showing a second embodiment of the rock groundwater intake facility of the present invention.
FIG. 5 is a cross-sectional view of the bedrock groundwater intake facility of FIG. 4;
FIG. 6 is a plan view of the bedrock groundwater intake facility of FIG. 4;
FIG. 7 is a longitudinal sectional view showing a third embodiment of the rock groundwater intake facility of the present invention.
FIG. 8 is a cross-sectional view of the bedrock groundwater intake facility of FIG. 7;
FIG. 9 is a longitudinal sectional view showing a fourth embodiment of the rock groundwater intake facility of the present invention.
FIG. 10 is a cross-sectional view of the bedrock groundwater intake facility of FIG. 9;
FIG. 11 is a longitudinal sectional view showing a fifth embodiment of the rock groundwater intake facility of the present invention.
FIG. 12 is a cross-sectional view of the rock groundwater intake facility of FIG. 11;
[Explanation of symbols]
1. Seaside
3 ... bedrock
10 ... Water collection tunnel
11 ... wall
12 ... bottom
13 ... Water collection section
20… water collecting hole
30 ... water tank
40 ... Pumping device (pumping means)
200 ... Tunnel (collection tunnel)
310 ... Salination prevention hole
321 ... water injection pipe (charge water supply means)
322 ... Packer (charge water supply means)
323 ... Pressurizing device (charge water supply means)
324: Water quality adjustment tank (recharge water supply means)
500… rock groundwater intake facility
620 plug (charge water supply means)
630 ... Salination prevention hole
900… rock groundwater intake facility
1100 ... Intake stop device
1210 ... Injection hole for condensate
1300… rock groundwater intake facility
1400 Water intake stop device
1510: Injection hole for condensate
1600… rock groundwater intake facility
1900: Rock groundwater intake facility
1920… water collecting hole
Se ... sea
Wa: bedrock groundwater
Wb: recharge water
Wd: recharge water

Claims (4)

It is formed in the rock and is provided so as to descend toward the water collecting part, and a number of water collecting holes are formed on the wall toward the rock, and a communication tunnel to the ground is connected to the ground . A catchment tunnel,
A water storage tank formed in the water collecting section;
A rock groundwater intake facility provided at a waterfront with pumping means for lifting rock groundwater stored in the water tank to the ground ,
A saltwater prevention hole formed on the sea side of the water collection tunnel;
A water injection pipe inserted into the salt water prevention hole, and a packer attached to an end of the water injection pipe to form a water injection space at an end of the salt water prevention hole, and recharge water into the water injection space of the salt water prevention hole. A bedrock groundwater intake facility comprising: a recharge water supply means for supplying water . In the rocky groundwater intake facility according to claim 1,
A rock groundwater intake facility, comprising a water intake stop device that opens and closes the water collection tunnel . The rock groundwater intake facility according to claim 1 or 2,
A bedrock groundwater intake facility comprising a water intake stop device for opening and closing the water intake hole . The rock groundwater intake facility according to claim 2 or 3,
A recharge water injection hole formed in the bedrock on the upstream side of the groundwater flow from the water collection tunnel, to which recharge water is injected and supplied via recharge water supply means;
A rock groundwater intake facility, characterized in that a plug constituting recharge water supply means is provided at the open end of the condensate injection hole to form an injection space .

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