JP2012154108A - Drain device and drain method for impervious structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of effectively and quickly draining water accumulated between a first and a second impervious sheets.SOLUTION: A drain device 1 for an impervious structure, where impervious sheets 37 and 39 are doubly laid on an inner surface of a water shielding object 31, comprises: a water collection section 6 which is installed at a lowest section 33 of the water shielding object 31, communicated with a space between a first and a second impervious sheets 37 and 39, and kept in an air tight state; a gas introduction means 25 which is installed at least one location in the water shielding object 31 to introduce air or gas having pressure higher than the air into the space between the first and the second impervious sheets 37 and 39; and a drainage means 15 which collects water from the space between the first and the second impervious sheets 37 and 39 into the water collection section 6 by reducing the pressure therein and drains the water out of the water collection section 6 by suctioning the collected water.

Description

  The present invention relates to a water draining device and a water draining method having a water shielding structure, and more particularly, to a water draining device and a water draining method having a water shielding structure effective for a waste disposal site having a double water shielding structure.

  In a waste disposal site where industrial waste and general waste are landfilled, sewage containing harmful substances leached from the waste penetrates into the ground and contaminates the surrounding environment by mixing into groundwater veins. In order to prevent this, it is necessary to construct a water-blocking structure on the ground of the disposal site to prevent the sewage leached from the waste from penetrating the ground.

  For this reason, for example, as shown in FIG. 10, on the ground 32 of the disposal site 31, a lower protection mat 36 (for example, a nonwoven fabric) and a first water shielding sheet (hereinafter referred to as a lower water shielding sheet 37). The upper protective mat 38, the second water-impervious sheet (hereinafter referred to as the upper water-impervious sheet 39), and the uppermost protective mat 40 are laid in five layers in this order from the bottom to form a double water-impervious structure 35. The double water-impervious structure 35 prevents leachate from the waste 45 from penetrating into the ground 32 side.

  By the way, when constructing the double water-impervious structure 35 configured as described above, after laying the upper-layer protective mat 38, the upper-layer water-impervious sheet 39 is laid on the upper part, and the period is several months. Often left in a state.

  For this reason, until the laying of the upper water-impervious sheet 39 is completed, water such as rainwater collected on the upper part of the lower water-impervious sheet 37 is sucked up by the drainage pump and drained outside the disposal site 31. Part of the water is absorbed and retained by the upper protective mat 38 above the lower water-impervious sheet 37, so that water such as rainwater collected on the upper part of the lower water-impervious sheet 37 is completely removed. I can't.

  In this state, when the upper water-impervious sheet 39 is laid and the uppermost protective mat 40 is laid thereon to complete the construction of the double water-impervious structure 35, the lower water-impervious sheet 37 and the upper layer In this state, water such as rain water is retained between the water shielding sheet 39. Then, the water such as rainwater flows in the lower direction along the slope of the disposal site 31 and is collected in the vicinity of the lowest portion 33, so that a bulge is generated in the upper water-impervious sheet 39 in the vicinity thereof, and this bulge is reduced in time. With the progress, it gradually becomes larger, and there is a possibility that the waste 45 will burst due to the weight.

  For this reason, it is necessary to excavate the waste 45 to expose the swollen portion of the upper water-impervious sheet 39 and to remove moisture from the swollen portion. This operation must be performed at regular intervals as needed until the landfill of the waste 45 is completed, which is very time-consuming.

  In order to cope with the above problems, it is conceivable to apply the technique described in Patent Document 1. In the technology described in Patent Document 1, a protective layer made of sand or the like is provided between the upper water-impervious sheet and the lower water-impervious sheet, and this protective layer is divided into a plurality of sections by a partition dam made of viscous soil or the like. In addition, a drain pipe is individually laid between each section and the water collection pit, and water in each section is individually drained into the water collection pit through the drain pipe of each section.

  According to the technique described in Patent Document 1, by evacuating each section through each drain pipe from the side of the water collection pit on a regular basis, leachate from the waste that has entered the section, It is possible to suck out water such as rainwater during construction that is held in the water and drain it to the water collection pit side.

JP-A-7-75765

  However, when the technique described in Patent Document 1 is applied, water is sucked out from each section by sucking the inside of each section only by vacuum suction. The water cannot be sucked out and drained into the water collecting pit, and therefore it is impossible to completely prevent the upper water-impervious sheet from bulging.

  The present invention has been made in view of the above-described conventional problems, and efficiently drains water collected between the first and second water shielding sheets having a double water shielding structure in a short time. An object of the present invention is to provide a water draining device and a water draining method having a water shielding structure.

In order to solve the above problems, the present invention employs the following means.
That is, the present invention is a water draining device having a water shielding structure in which a water shielding sheet is laid double on the inner surface of a water shielding object, and is installed at the lowest part of the water shielding object, An airtight water collecting portion communicated between the second impermeable sheets and at least one location of the impermeable object, and introduces air between the first and second impermeable sheets, or a large Gas introduction means for introducing a gas having a pressure equal to or higher than the atmospheric pressure, and by reducing the pressure in the water collecting portion, water is collected into the water collecting portion from between the first and second water shielding sheets, and the water is sucked up. And a drainage means for draining outside the water collecting section.

According to the water drainage device of the water-impervious structure of the present embodiment, the gas introduction unit introduces a gas having a pressure equal to or higher than the atmospheric pressure between the first and second water-impervious sheets, and the drainage unit collects the water. By depressurizing the inside of the section, a pressure difference can be generated between the first and second water shielding sheets and the inside of the water collecting section. By this pressure difference and the weight of waste or the like, the first and second Water collected between the water shielding sheets can be collected in the lowest water collecting portion to be shielded. And by the drainage means, the water collected in the water collection part can be sucked up and drained outside the water collection part.
Therefore, compared with the case where water is drained between the first and second impermeable sheets only by the weight of waste or the like, or when the water is extracted between the first and second impermeable sheets only by vacuum suction, Water can be drained from between the first and second impermeable sheets in a short time.

  Further, in the present invention, the water collecting portion is provided with a water collecting pipe in which an airtight water collecting space is provided, and a lower end of the water collecting space communicates between the first and second water shielding sheets. The drainage means comprises a drainage pump that sucks up the water collected in the water collection space and drains it outside the water collection space, and a vacuum pump for decompressing the water collection space, and the gas introduction means Is installed at least at one location of the water shielding object, the lower end is communicated between the first and second water shielding sheets, the upper end is opened to the atmosphere, or a gas having a pressure higher than the atmospheric pressure is contained therein. It may be composed of a gas introduction pipe to be introduced.

  According to the water draining device of the water shielding structure of the present invention, a gas having a pressure equal to or higher than the atmospheric pressure is introduced between the first and second water shielding sheets via the gas introduction pipe, and the water collection space is obtained by a vacuum pump. By depressurizing the inside, a pressure difference can be generated between the first and second water shielding sheets and the water collection space. And by this pressure difference and the weight of waste etc., the water collected between the 1st, 2nd water shielding sheets can be collected in the water collecting space of the lowest part of the water shielding object. And the water collected in the water collection space can be sucked up by the drainage pump and drained out of the water collection space.

  Furthermore, in the present invention, the lower end of the water collecting pipe is provided with a water passing portion comprising a plurality of holes or slits communicating with the inside and outside of the water collecting space, and the lower end is closed in the water collecting space, A pump chamber having an upper end opened and an upper end positioned above the water flow portion and a lower end positioned above the bottom surface of the water collection space is provided, and the drain pump is provided in the pump chamber. It is good to be.

  According to the water draining device of the water shielding structure of the present invention, the water accumulated between the first and second water shielding sheets flows into the water collecting space through the water passing portion of the water collecting pipe, and from within the water collecting space. It flows into the pump chamber and is sucked up by the drain pump from the pump chamber and drained outside the water collection space.

  Furthermore, in the present invention, the gas introduction pipe may be provided with a pressurizing means for introducing a gas having a pressure equal to or higher than atmospheric pressure into the gas introduction pipe.

  According to the drainage device of the water-impervious structure of the present invention, atmospheric pressure is introduced between the first and second water-impervious sheets by introducing a gas having a pressure equal to or higher than atmospheric pressure into the gas introduction pipe by the pressurizing means. The gas with the above pressure can be introduced, and the pressure difference between the first and second water shielding sheets and the water collection space can be increased.

  Furthermore, in the present invention, a recess that is one step lower than the other portions is provided in the lowest portion of the water shielding target, and the lower end portion of the water collecting pipe may be inserted into the recess.

  According to the water drainage device of the water shielding structure of the present invention, the water accumulated between the first and second water shielding sheets is collected in the concave portion of the lowest portion of the water shielding target, and from the concave portion of the water collecting pipe It will flow into the water collection space through the water passage.

Furthermore, the present invention is a water draining method for draining water accumulated between the double laid water shielding sheets of the water shielding structure in which the water shielding sheets are double laid on the inner surface of the water shielding target, An airtight water collecting part is installed at the lowest part of the water shielding object, the water collecting part is communicated between the first and second water shielding sheets, and a gas introduction means is provided at at least one place of the water shielding object. It is possible to introduce a gas having a pressure equal to or higher than the atmospheric pressure between the first and second water shielding sheets by the gas introducing means,
By depressurizing the inside of the water collecting part, water is collected from between the first and second water shielding sheets into the water collecting part, and the water is sucked up and drained outside the water collecting space. .

  As described above, according to the drainage device and drainage method of the water-impervious structure of the present invention, the water accumulated between the first and second water-impervious sheets of the double water-impervious structure is efficiently obtained. It can be removed in a short time.

It is the top view which showed the whole 1st Embodiment of the draining apparatus of the water-impervious structure by this invention. It is sectional drawing of FIG. It is the elements on larger scale of FIG. 2, Comprising: It is explanatory drawing which showed the non-operation state of the water draining apparatus. It is explanatory drawing which showed the operation state of the water draining apparatus of FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is sectional drawing which showed the whole 2nd Embodiment of the water draining apparatus of the water-impervious structure by this invention. It is the elements on larger scale of FIG. 6, Comprising: It is explanatory drawing which showed the non-operation state of the water draining apparatus. It is explanatory drawing which showed the operation state of the water draining apparatus of FIG. It is sectional drawing which showed the modification of the water draining apparatus of the water-impervious structure by this invention. It is sectional drawing which showed an example of the conventional water-impervious structure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a first embodiment of a water draining device having a water shielding structure according to the present invention. The water draining device 1 having a water-impervious structure according to the present embodiment is applied to a waste disposal site 30 as a water-impervious object provided with a double water-impervious structure 35. This is effective for draining water between the first and second water-impervious sheets 37 and 39 (hereinafter referred to as the lower-layer impermeable sheet 37 and the upper-layer impermeable sheet 39).

  The waste disposal site 30 provided with the double water-impervious structure 35 is, for example, a concave shape formed so as to gradually become deeper from one side to the other (left to right in the figure) as shown in FIGS. In the ground 32 of the disposal site 31, a lower protective mat 36, a lower water shielding sheet 37, an upper protective mat 38, an upper water shielding sheet 39, and an uppermost protective mat 40 are arranged in five layers in this order from the bottom. The drainage device 1 of the present embodiment (hereinafter referred to as the drainage device) is applied to the waste disposal site 30 of the double water-impervious structure 35 having such a configuration. In the figure, 43 is a retaining wall.

  The lowest part 33 of the disposal site 31 to which the water draining device 1 of the present embodiment is applied is provided with a recess 34 that is one step lower than the other parts, as shown in FIGS. In addition, a lower-layer protective mat 36, a lower-layer water-proof sheet 37, and an upper-layer protective mat 38 are laid in that order so as to cover the inner surface of the concave portion 34. The lower end of the water pipe 3 is inserted.

  As shown in FIGS. 3 and 4, a cylindrical insertion portion 41 that rises upward is integrally provided in a portion corresponding to the concave portion 34 of the upper water-impervious sheet 39. With the water collecting pipe 3 of the water section 2 inserted, the lower end of the water collecting pipe 3 is inserted into the recess 34. In this case, the outer peripheral surface of the water collecting pipe 3 is integrally joined to the inner peripheral surface of the insertion portion 41 by an adhesive or the like, and thereby the two are hermetically sealed.

  As shown in FIGS. 1 and 2, the water draining device 1 of the present embodiment includes a water collecting section 2 provided in the lowest part 33 of the disposal site 31, a drainage means 14 provided in the water collecting section 2, and disposal. The gas introduction means 25 is provided in at least one place of the field 31.

  As shown in FIGS. 3 and 4, the water collecting section 2 is installed in the recess 34 of the disposal site 31 and has a water collecting pipe 3 in which an airtight water collecting space 6 is provided, and a water collecting space. The drainage pump 15 as the drainage means 14 provided in 6 and the vacuum pump 20 as the drainage means 14 that is provided outside the disposal site 31 and depressurizes the water collection space 6. In the present embodiment, a submersible pump is used as the drainage pump 15, but a pumping pump may be used instead of the submersible pump.

  The water collecting pipe 3 is made of a tubular member such as a steel pipe or a vinyl chloride pipe, and the upper and lower ends of the tubular member are closed by an upper lid 4 and a lower lid 5 to form an airtight water collecting space 6 inside. Therefore, it is erected vertically in the recess 34 of the disposal site 31.

  On the side surface in the vicinity of the lower end of the water collecting pipe 3, a water passing portion 7 composed of a plurality of holes or slits penetrating the inside and outside of the water collecting pipe 3 is provided over the entire circumference, and the water collecting pipe provided with this water passing portion 7. 3 is inserted into the recess 34 of the disposal site 31.

  As described above, since the space between the outer peripheral surface of the water collecting pipe 3 and the inner peripheral surface of the insertion portion 41 of the upper water-impervious sheet 39 is hermetically sealed, the interior of the recess 34 is shielded from the outside air. In this state, the lower water-impervious sheet 37 and the upper water-impervious sheet 39 communicate with each other, and the water collecting space 6 of the water collecting pipe 3 in which the lower end is inserted into the recessed part 34 passes through the recessed part 34. It communicates via the water part 7.

  A mesh-like strainer 8 is attached to the side surface near the lower end of the water collecting pipe 3 so as to cover the periphery of the water passing portion 7, such as dust contained in the water collected in the recess 34 by the strainer 8. The solid matter is removed, and the solid matter is prevented from flowing into the water collecting space 6 together with the water 46.

  As shown in more detail in FIG. 5, a pump chamber 9 is provided at the bottom of the water collection space 6 of the water collection pipe 3, and a submersible pump 15 as a drainage pump is provided in the pump chamber 9. The pump chamber 9 is configured by, for example, using a tubular member 10 such as a steel pipe or a vinyl chloride pipe as a material and closing the lower end of the tubular member 10 with the lower lid 11. The outer diameter dimension and the height dimension are set so that a predetermined gap is formed between them and the upper end is located above the water flow portion 7 of the water collecting pipe 3. In the figure, reference numeral 12 denotes a support leg that supports the pump chamber 9 on the bottom of the water collection space 6.

  The submersible pump 15 is provided in the pump chamber 9 so that a predetermined gap is formed between the suction port 16 at the lower end and the bottom surface of the pump chamber 9. A drain pipe 18 is connected to the discharge port 17 of the submersible pump 15, and the drain pipe 18 is drawn out of the disposal site 31 through the upper cover 4 of the water collecting pipe 3 as shown in FIGS. 3 and 4. Yes.

  By operating the submersible pump 15, the water 46 accumulated between the lower water-impervious sheet 37 and the upper water-impervious sheet 39 flows into the recess 34 from between the two water-impervious sheets 37, 39, 34 flows into the water collection space 6 through the water flow portion 7 from the inside, flows into the pump chamber 9 from the water collection space 6, sucked up from the pump chamber 9, and collected through the drain pipe 18. 6 is drained outside.

  As shown in FIGS. 3 and 4, the vacuum pump 20 is installed outside the disposal site 31. An intake pipe 22 is connected to the intake port 21 of the vacuum pump 20, and the intake pipe 22 passes through the upper cover 4 of the water collection pipe 3 and is inserted into the water collection space 6.

  By operating the vacuum pump 20, the air 47 in the water collection space 6 is sucked and exhausted outside the water collection space 6, and the water collection space 6 is depressurized to a pressure lower than the atmospheric pressure. The degree of decompression in the water collection space 6 can be adjusted to an appropriate value by appropriately setting the type, quantity, and the like of the vacuum pump 20 to be used.

  In the present embodiment, the vacuum pump 20 is used as a means for reducing the pressure in the water collection space 6, but not limited to the vacuum pump 20, the pressure in the water collection space 6 can be reduced to a pressure lower than the atmospheric pressure. If it is.

  As shown in FIG.1 and FIG.2, the gas introduction pipe | tube 26 as the gas introduction means 25 is standingly arranged at least at one place (6 places in this Embodiment) of the disposal site 31 perpendicularly | vertically. Each gas introduction pipe 26 is configured by using a tubular member such as a steel pipe or a vinyl chloride pipe as a material, and a lower end opening is communicated between a lower water-impervious sheet 37 and an upper water-impervious sheet 39, and an upper end opening is formed. Are disposed at various locations on the disposal site 31 so that the atmosphere is released to the atmosphere.

  As shown in FIG. 2, each gas introduction pipe 26 is inserted into an insertion hole 42 having a lower end penetrating the upper water shielding sheet 39 provided in the upper water shielding sheet 39. The peripheral edge of the insertion hole 42 is integrally joined with an adhesive or the like. Thereby, the inside of each gas introduction pipe 26 is communicated between the lower water-proof sheet 37 and the upper water-proof sheet 39.

  A lid 27 that opens and closes the upper end is detachably provided at the upper end of the gas pressure introducing pipe 26. When draining water between the upper and lower water shielding sheets 39, 37, the lid 27 is removed to open the upper end, When water is not drained from the upper and lower water shielding sheets 39, 37, the lid 27 is attached to close the upper end. With this configuration, it is possible to prevent rainwater or the like from entering between the upper and lower water shielding sheets 39 and 37 through the atmospheric pressure introduction pipe 26.

  The gas introduction pipe 26 is not limited to a hard tubular member such as a steel pipe or a polyvinyl chloride pipe, and may be constituted by a tubular member made of a flexible material. The gas introduction pipe 26 is made of a flexible material and is kept in a rolled state, so that the gas introduction pipe 26 is extended little by little as the disposal of the waste 45 in the disposal site 31 progresses. Can do.

  And if the lid | cover 27 is removed from the upper end of the gas introduction pipe | tube 26 of the draining apparatus 1 of this Embodiment comprised as mentioned above, and the upper end of the gas introduction pipe | tube 26 is open | released to air | atmosphere, the lower layer will be let through the gas introduction pipe | tube 26. The atmosphere is introduced between the water shielding sheet 37 and the upper water shielding sheet 39. When the vacuum pump 20 is operated in this state to depressurize the water collection space 6, a pressure difference is generated between the upper and lower water shielding sheets 39 and 37 and the water collection space 6. Due to the weight of the waste 45, the water 46 retained in the upper protective mat 38 between the lower water-impervious sheet 37 and the upper water-impervious sheet 39 is the lowest part 33 along the inclination of the disposal site 31. And collected in the recess 34 of the lowest part 33. In addition, the water 46 collected in the recess 34 flows into the water collection space 6 through the water flow portion 7, flows into the pump chamber 9 through the water collection space 6, and is stored in the pump chamber 9. The Then, by operating the submersible pump 15 in the pump chamber 9, the water 46 stored in the pump chamber 9 can be drained out of the water collection space 6 through the drain pipe 18.

  In this case, the timing of operating the submersible pump 15 is determined by the upper and lower impermeable sheets 39 and 37 depending on the atmospheric pressure introduced between the upper and lower impermeable sheets 39 and 37 through the gas introduction pipe 26 and the weight of the waste 45. Water 46 is collected in the recess 34, flows into the water collection space 6 from the recess 34, flows into the pump chamber 9 from the water collection space 6, overflows from the pump chamber 9, and collects water. It is assumed that the water level in the space 6 has risen to a predetermined position above the upper end of the pump chamber 9. The operation timing of the vacuum pump 20 is assumed to be when the submersible pump 15 is operated and the water level in the water collecting space 6 gradually decreases and reaches the vicinity of the upper end of the pump chamber 9.

  By operating the submersible pump 15 and the vacuum pump 20 at such timing, the pressure difference between the water level in the water collecting space 6 and the upper and lower impermeable sheets 39 and 37 can be increased. Water 46 can flow into the water collection space 6 from between the water shielding sheets 39 and 37.

  Further, when the water level in the water collection space 6 is lowered to the vicinity of the upper end of the pump chamber 9, the water level in the pump chamber 9 is lowered thereafter, but between the outer surface of the pump chamber 9 and the inner surface of the water collection space 6. The water level is not lowered because it is partitioned by the tubular member 10 of the pump chamber 9. This is the same even if all the water 46 in the pump chamber 9 is sucked up. Even if water 46 flows into the water collection space 6 from between the upper and lower water shielding sheets 39, 37, the water level between the outer surface of the pump chamber 9 and the inner surface of the water collection space 6 remains at the upper end of the pump chamber 9. No higher than. The water 46 that has flowed into the water collection space 6 is sucked up by the negative pressure in the water collection space 6, flows into the pump chamber 9 beyond the upper end of the pump chamber 9, and is sucked up by the submersible pump 15. Because.

  Furthermore, when water 46 is sucked up from the pump chamber 9 by the submersible pump 15, a negative pressure acts on the upper surface of the water 46 between the outer surface of the pump chamber 9 and the inner surface of the water collecting space 6. The water level of the water 46 can be maintained at the height of the upper end of the pump chamber 9, the suction force of the water 46 from the pump chamber 9 can be stabilized, and water is collected from between the upper and lower impermeable sheets 39 and 37. The inflow of water 46 into the space 6 can be stabilized.

  Furthermore, since the upper end of the pump chamber is disposed above the upper end of the water flow portion 7, even when the water level of the water 46 near the water flow portion 7 is equal to or lower than the upper end of the pump chamber 9, The water 46 existing between the upper end of the pump chamber 9 and the upper end of the water flow portion 7 exhibits a sealing function that makes it difficult for air to enter. That is, the water 46 flowing in between the upper and lower water shielding sheets 39 and 37 blocks the intrusion of air. Thereby, even if the water level of the water 46 between the upper and lower impermeable sheets 39 and 37 reaches the upper end of the water flow portion 7, the air between the upper and lower impermeable sheets 39 and 37 is occasionally in the water collecting space 6. A large amount of air does not enter continuously as long as it enters the bubble state, and the decompressed state in the water collecting space 6 can be maintained. Thereby, the water between the upper and lower water shielding sheets 39 and 37 can be stably allowed to flow into the water collection space 6.

  By continuously performing the water draining operation as described above, the amount of water 46 flowing in the direction of the concave portion 34 from between the lower water-impervious sheet 37 and the upper water-impervious sheet 39 gradually decreases, and is collected. When water 46 containing a large amount of air flows into the water space 6, the degree of vacuum in the water collection space 6 changes. The degree of vacuum is detected one by one on the vacuum pump 20 side, and when the degree of vacuum reaches a set value, the air introduced between the upper and lower water shielding sheets 39 and 37 from the gas introduction pipe 26 is collected. The operation of the vacuum pump 20 and the submersible pump 15 is stopped as having flowed into the water space 6.

  By periodically performing such work, the water 46 accumulated between the lower water-impervious sheet 37 and the upper water-impervious sheet 39 can be drained efficiently and in a short time. The water 46 accumulated between the water sheet 37 and the upper water-impervious sheet 39 can prevent the upper water-impervious sheet 39 near the lowest part 33 of the disposal site 31 from being swollen, It can be prevented from bursting.

  In the drainage device 1 of the present embodiment configured as described above, the pressure difference generated between the upper and lower water shielding sheets 39 and 37 and the water collection space 6, and the waste 45 The water 46 collected between the upper and lower water-impervious sheets 39 and 37 is collected in the recess 34 of the lowest part 33 of the disposal site 31 by the weight, and drained from the recess 34 to the outside of the water collection space 6. Therefore, water can be drained more efficiently and in a shorter time than when water is drained only by the weight of the waste or when water is drained by vacuum suction between the upper and lower impermeable sheets.

  6 to 8 show a second embodiment of the water draining device according to the present invention. The drainage device 1 according to the present embodiment is applied to a waste disposal site 30 having a concave disposal site 31 whose center is lowest, and the other configuration is the same as that of the first embodiment. It is the same as that shown.

  And even if it exists in the drainage apparatus 1 of this Embodiment, there exists an effect similar to what is shown in the said 1st Embodiment.

  In addition, in each said embodiment, although the water collection part 2 and the drainage means 14 were provided in the minimum part 33, you may provide two or more. Moreover, you may provide in both the lowest part 33 and the part higher than the lowest part 33. FIG.

  Further, in each of the above embodiments, the lower end of the gas introduction pipe 26 is communicated between the upper and lower water shielding sheets 39 and 37, and the upper end is opened to the atmosphere, whereby the atmosphere is blocked up and down via the gas introduction pipe 26. Although introduced between the water sheets 39 and 37, as shown in FIG. 9, a hole 28 communicating with the upper and lower water shielding sheets 39 and 37 is provided in at least one place in a portion continuous to the ground surface of the water shielding structure. Air may be introduced between the upper and lower water shielding sheets 39 and 37 through the hole 28. In this case, a lid for opening and closing the hole 28 may be provided, or a tubular member 29 made of a flexible material may be connected to the hole 28.

  Moreover, in each said embodiment, although the gas introduction means 25 was provided in the multiple places (six places) of the peripheral part of the disposal site 31, the gas introduction means 25 is provided in parts other than the peripheral part of the disposal site 31. Alternatively, it may be provided at both the peripheral portion and other portions.

  Further, in each of the above embodiments, the upper end of the gas introduction pipe 26 is opened to the atmosphere, and the atmosphere is introduced between the lower water shielding sheet 37 and the upper water shielding sheet 39 via the gas introduction pipe 26. However, although not shown, a pressurizing means such as a compressor may be connected to the gas introduction pipe 26 so that a gas having a pressure higher than the atmospheric pressure is supplied into the gas introduction pipe 26 by the pressurization means. Good.

  Further, in the above description, the double water-impervious structure 35 in which the space between the upper and lower water-impervious sheets 39 and 37 is formed in series is the target, but the space between the upper and lower water-impermeable sheets 39 and 37 is a plurality of blocks. You may apply this invention to the double water-impervious structure divided. In that case, a water collecting part, a draining means, and a gas introducing means may be provided for each block, and water may be extracted from between the upper and lower water shielding sheets for each block.

  Furthermore, in the above description, the present invention is applied to the double water-impervious structure 35 of the waste disposal site 30 as a water-impervious object, but the present invention is applied to water-impermeable objects other than the waste disposal site 30. Also good.

DESCRIPTION OF SYMBOLS 1 Drainage device of water-impervious structure 2 Water collecting part 3 Water collecting pipe 4 Upper lid 5 Lower lid 6 Water collecting space 7 Water passing part 8 Strainer 9 Pump chamber 10 Tubular member 11 Lower lid 12 Support leg 14 Drainage means 15 Drainage pump (underwater pump)
DESCRIPTION OF SYMBOLS 16 Suction port 17 Discharge port 18 Drain pipe 20 Vacuum pump 21 Intake port 22 Intake pipe 25 Gas introduction means 26 Gas introduction pipe 27 Lid 28 Hole 29 Tubular member 30 Water shielding target (waste disposal site)
31 disposal site 32 ground 33 lowest part 34 recess 35 double water-impervious structure 36 lower protection mat 37 first water-proof sheet (lower water-proof sheet)
38 Upper protective mat 39 Second water-proof sheet (upper water-proof sheet)
40 Uppermost protective mat 41 Insertion portion 42 Insertion hole 43 Retaining wall 45 Waste 46 Water 47 Air

Claims (6)

A water draining device having a water shielding structure in which a water shielding sheet is laid on the inner surface of a water shielding object,
An airtight water collecting portion that is installed at the lowest portion of the water shielding target and communicated between the first and second water shielding sheets;
Gas introduction means installed at at least one location of the water shielding object, introducing air between the first and second water shielding sheets, or introducing gas having a pressure equal to or higher than atmospheric pressure,
Draining means for collecting water from between the first and second water-impervious sheets into the water collecting part by sucking the water out of the water collecting part by reducing the pressure inside the water collecting part;
A water draining device having a water shielding structure. The water collecting portion is provided with an airtight water collecting space inside, and a lower end of the water collecting space includes a water collecting pipe communicated between the first and second water shielding sheets,
The drainage means comprises a drainage pump that sucks up water collected in the water collection space and drains it outside the water collection space, and a vacuum pump that decompresses the water collection space,
The gas introduction means is erected at at least one location of the water shielding object, and has a lower end communicated between the first and second water shielding sheets, an upper end is opened to the atmosphere, or the interior is at or above atmospheric pressure. The water draining device having a water-impervious structure according to claim 1, comprising a gas introduction pipe into which a pressure gas is introduced. The lower end of the water collecting pipe is provided with a water passing portion comprising a plurality of holes or slits communicating with the inside and outside of the water collecting space,
In the water collection space, there is provided a pump chamber in which a lower end is closed, an upper end is opened, an upper end is located above the water flow portion, and a lower end is located above the bottom surface of the water collection space. And
The drainage device with a water-impervious structure according to claim 2, wherein the drainage pump is provided in the pump chamber.   4. The water draining device according to claim 2 or 3, wherein the gas introduction pipe is provided with a pressurizing means for introducing a gas having a pressure equal to or higher than atmospheric pressure into the gas introduction pipe.   The lowest part of the water shielding object is provided with a recess that is one step lower than other parts, and the lower end of the water collecting pipe is inserted into the recess. A water draining device having a water shielding structure according to item 1. A water draining method for draining water accumulated between the double water shielding sheets of the water shielding structure in which water shielding sheets are double laid on the inner surface of the water shielding object,
An airtight water collecting part is installed at the lowest part of the water shielding object, and the water collecting part is communicated between the first and second water shielding sheets,
Gas introduction means is installed in at least one location of the water shielding object, and the gas introduction means can introduce air between the first and second water shielding sheets, or a gas having a pressure higher than atmospheric pressure,
By depressurizing the inside of the water collecting part, water is collected from between the first and second water shielding sheets into the water collecting part, and the water is sucked up and drained outside the water collecting space. How to drain water.

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