JP5758719B2 - Water shielding structure of storage facility - Google Patents

Description

  The present invention relates to a water shielding structure for a storage facility.

  In storage facilities used for the disposal of various types of waste or temporary storage such as earth and sand, a water shielding sheet is installed at the bottom to prevent harmful substances contained in the storage from leaking out as contaminated water. May be laid. In this case, in order to protect the surface of the water shielding sheet, it is common to cover the water shielding sheet with protective soil.

  In a storage facility where a water shielding sheet is laid, the water shielding sheet may be damaged. When the water shielding sheet is damaged, in order to prevent the contaminated water in the storage facility from leaking from the damaged part, it is necessary to quickly identify the damaged position and repair the damaged part.

  A method for detecting a breakage position of a water shielding sheet by electric detection is known. As a method for detecting the breakage position, for example, in Patent Document 1, the first electrode provided on the upper side of the water shielding sheet and the lower side of the water shielding sheet are provided, and a plurality of linear electrodes are arranged in a lattice shape. In a configuration including a second grid-like linear electrode, etc., which is arranged in such a manner and having an insulation processing portion at the intersection, the water shielding is performed in two-dimensional coordinates by measuring the current flowing through the linear electrode. A water leak occurrence position detection method for obtaining a breakage position of a sheet is disclosed. According to this, a breakage position can be specified in a measurement time shorter than before.

Japanese Patent No. 3622172

  However, after identifying the breakage position by the above detection method, in order to repair the breakage point, the storage around the breakage position is removed by heavy machinery etc., then excavating the protective soil covering the water shielding sheet, It is necessary to expose the damaged part. For this reason, when repairing a damaged part, a construction period is required, and the response | compatibility may be difficult from an emergency viewpoint.

  Therefore, an object of the present invention is to provide a water shielding structure for a storage facility that can be completed in a short period of time in repairing a damaged portion of a water shielding sheet and is suitable for emergency treatment.

The water shielding structure of the storage facility according to the present invention includes a lower water shielding sheet laid at the bottom of the storage facility, an upper water shielding sheet laid above the lower water shielding sheet, a lower water shielding sheet, and the upper water shielding sheet. An intermediate protective soil layer provided between the sheets, the intermediate protective soil layer being partitioned into a plurality of partitions in the horizontal direction, and the upper impermeable sheet corresponds to the partition on either the upper or lower side. An application electrode for applying a voltage and a measurement electrode that is provided corresponding to the partition on the other side and that is energized based on water leakage when the upper water shielding sheet is damaged. In the layer, a plurality of injection pipes having a discharge portion for discharging a slow-acting injection material penetrating into the intermediate protective soil layer are arranged, and the discharge portions of the plurality of injection pipes are arranged for each section. The partition part is an intermediate protective soil layer on the lower water-impervious sheet After providing, Ru der those formed by implanting the surface of the intermediate protective soil layer Madokayui infusion material to an intermediate protective soil layer.

  In this water-impervious structure of the storage facility, when the upper water-impervious sheet breaks, the water accumulated on the upper water-impervious sheet oozes out from the damaged part into the intermediate protective soil layer and passes through the water to the application electrode. The measurement electrode is energized. Moreover, since the application electrode and the measurement electrode are provided corresponding to each section, the damaged portion of the upper water shielding sheet is specified by the position of the measurement electrode where the energization is detected. Then, when the slow-injection injection material is injected from the injection pipe disposed in the section corresponding to the damaged portion, the slow-injection injection material penetrates into the intermediate protection soil layer, and the intermediate protection soil layer in the section While being filled with the slow setting injection material, the slow setting injection material reaches the damaged portion. The injected slow injecting material solidifies over time, and the damaged portion is repaired by the slow injecting material. If the damaged part can be repaired in this way, it is not necessary to excavate the protective soil to expose the damaged part of the water-impervious sheet as in the past, and the repair can be completed in a short period of time, and emergency treatment is performed. Also suitable for.

The intermediate protective soil layer, since a plurality to are partitioned by the partition portion, when injected with Yuruyui infusion material to an intermediate protective soil layer, the partition portion is to slow formation of grout intermediate protective soil layer Will be blocked. Accordingly, the range in which the slow-acting injection material permeates in the horizontal direction is limited, the permeation in the vertical direction proceeds faster, and the slow-acting injection material can reach the damaged portion earlier.

Further, the partition portion, since those which are formed by implanting Madokayui infusion material to an intermediate protective soil layer, after an intermediate protective soil layer, the surface of the intermediate protective soil layer, to be partitioned Construction is simple because the partition part is formed by injecting the instantaneous setting material and aiming at the place.

  ADVANTAGE OF THE INVENTION According to this invention, in the repair of the broken location of a water-impervious sheet, a short construction period is sufficient, and the water-impervious structure of a storage facility suitable for emergency treatment can be provided.

It is sectional drawing which shows one Embodiment of the water-impervious structure of the storage facility which concerns on this invention. It is a top view which shows the arrangement | positioning relationship between the division and injection pipe in the water shielding structure of the storage facility of FIG. It is a principal part expanded sectional view which shows the water-impervious structure of the storage facility of FIG. FIG. 4 is a plan view of FIG. 3. It is sectional drawing which shows the state with which the injection material was filled in the division. It is sectional drawing which shows other embodiment of the water-impervious structure of the storage facility which concerns on this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a water shielding structure for a storage facility according to the invention will be described with reference to the accompanying drawings.

  In a disposal site known as an example of a storage facility, the water-impervious structure 1 is a water-impervious work laid on the bottom 15 of the disposal site A as shown in FIG. It is divided into a plurality in the direction. An injection tube 3 extending from the outside of the compartment 16 is disposed in the compartment 16. In addition, in the water-impervious structure 1 of the disposal site A shown in FIG. 1, the configuration other than the partition part 2 and the injection pipe 3 is omitted for convenience of illustration.

  As shown in FIG. 2, the partition part 2 forms a grid-like section 16 having a side of 2 m to 25 m. The injection tube 3 extends through each partition 2 into each compartment 16. On the distal end side of the injection tube 3, a large number of holes (discharge portions) 12 for discharging a later-described slow-binding injection material are formed, and the holes 12 of the injection tube 3 are arranged for each section 16. Here, for the convenience of construction, in order to reduce the portion of the injection pipe 3 penetrating the partition portion 2, it is preferable that the injection pipe 3 is provided around the disposal site A.

  As shown in FIGS. 3 and 4, the water-impervious structure 1 of the disposal site A is a double water-impervious structure including two water-impervious sheets, and includes a lower impermeable sheet 4 and an upper impermeable sheet 5. It is equipped with.

  Each of the lower water-impervious sheet 4 and the upper water-impervious sheet 5 is a sheet fabric having a size of several tens of meters × several tens of meters and a thickness of 1.5 mm to 2.0 mm and is heat-sealed. The lower water-impervious sheet 4 and the upper water-impervious sheet 5 are each provided with nonwoven fabrics 6a and 6b having high water permeability in order to physically protect the sheet.

  When the upper water-impervious sheet 5 is damaged, the upper impermeable sheet 5 is disposed along the upper nonwoven fabric 6a and is applied along the application electrode 7 capable of applying a voltage, and the lower nonwoven fabric 6b. And the measuring electrode 8 that is energized based on the leakage of water. The application electrode 7 and the measurement electrode 8 are provided corresponding to each section 16 as shown in FIG. In FIG. 4, for the sake of convenience, some components such as a water shielding sheet are not shown.

  The measurement electrodes 8 are arranged in a horizontal two-dimensional direction, and are arranged so that they intersect each section 16. An insulating portion 9 is provided at the intersection of the measurement electrodes 8 so that the orthogonal measurement electrodes 8a and 8b are not energized.

  The application electrode 7 and the measurement electrode 8 are each connected to an external water leakage detection device (not shown) via wiring, and current flows through the water leakage detection device during measurement.

  An intermediate protective soil layer 11 is provided between the lower impermeable sheet 4 and the upper impermeable sheet 5. As the intermediate protective soil layer 11, sand or soil having water permeability is used, and is laid between 10 cm and 100 cm. From the viewpoint of evenly injecting an injection material to be described later, the intermediate protective soil layer 11 is preferably made as uniform as possible in the section 16, and the injection pipe 3 is disposed in the intermediate protective soil layer 11.

  The interior of the intermediate protective soil layer 11 is divided into a plurality of portions in the horizontal direction by the partition portion 2 as described above. After installing the lower water-impervious sheet 4, the injection pipe 3 and the intermediate protective soil layer 11, the partition unit 2 aims at the location to be partitioned on the surface of the intermediate protective soil layer 11, for example, a water glass-based instantaneous It is formed by injecting a coagulant injection material.

  Here, the partition part 2 refers to a part having a water permeability coefficient that is one digit or more smaller than the water permeability coefficient of the intermediate protective soil layer 11 and having a height equivalent to that of the intermediate protective soil layer 11.

  A protective soil 10 is laid above the water shielding structure 1 of the disposal site A. The protective soil 10 plays a role of protecting the upper water-impervious sheet 5 from wastes thrown into the disposal site A, heavy machinery or vehicles entering the disposal site A, and has an arbitrary thickness. .

  Next, the effect | action of the water-impervious structure 1 of the disposal site A is demonstrated, referring FIG. FIG. 5 is a cross-sectional view showing a state where the section 16 is filled with the slow-binding injection material 14.

  In the disposal site A, usually, contaminated water derived from decomposition of organic substances and rain is accumulated. When the upper water-impervious sheet 5 is damaged in the water-impervious structure 1 of the disposal site A, the contaminated water accumulated on the upper water-impervious sheet 5 oozes out from the damaged part 13 to the intermediate protective soil layer 11 and is applied. When a current is passed through the electrode 7, the application electrode 7 and the measurement electrode 8 are energized through the contaminated water, and the current value changes. Therefore, it is possible to confirm whether or not the upper water-impervious sheet 5 is damaged by the water leakage detection device, for example, by periodic measurement once a day.

  Since the application electrode 7 and the measurement electrode 8 are provided corresponding to each section 16, and the measurement electrode 8 is arranged in the horizontal two-dimensional direction, the energization is detected when energization occurs. The damaged part of the upper water-impervious sheet 5 can be specified by the position of the measurement electrode 8.

  In order to repair the damaged portion, the slow-binding injecting material 14 is injected through the injection tube 3 disposed in the section 16 corresponding to the damaged portion. When the slow-injection injecting material 14 is injected, the slow-injection injecting material 14 penetrates into the intermediate protective soil layer 11, and the intermediate protective soil layer 11 in the section 16 is filled with the slow-injecting injectable material 14, so The injectable material 14 reaches the damaged portion 13.

  At this time, the partition part 2 that divides the intermediate protective soil layer 11 has a water permeability coefficient that is one or more orders of magnitude smaller than the water permeability coefficient of the intermediate protective soil layer 11 and has a height equivalent to that of the intermediate protective soil layer 11. Therefore, when the slow-binding injection material 14 is injected into the intermediate protective soil layer 11, the partition portion 2 blocks the penetration of the slow-binding injection material 14 into the intermediate protective soil layer 11. As a result, the range in which the slow-acting injection material 14 permeates in the horizontal direction is limited, and the permeation in the vertical direction proceeds faster, so that the slow-acting injection material 14 reaches the damaged portion 13 earlier.

  The injected slow-injection injection material 14 is eventually solidified, and the damaged portion 13 is repaired by the slow-injection injection material 14.

  Here, the slow-acting injection material 14 is a solution or a fine-grain suspension in addition to a high water-blocking property after solidification, and the gel time can be adjusted, and when penetrating into the intermediate protective soil layer 11 A material that does not cause material separation (for example, an aqueous polyvinyl alcohol solution) can be preferably used.

  If it is possible to repair the damaged portion 13 as described above, it is not necessary to excavate the protective soil and expose the damaged portion of the water-impervious sheet as in the conventional case, and the repair can be completed in a short period of time. Suitable for processing.

  FIG. 6 is a cross-sectional view showing another embodiment of the water shielding structure for a storage facility according to the present invention. The water-impervious structure 20 of the disposal site B of this embodiment is different from that of the above-described embodiment in that a clay layer 17 is provided between the lower water-impervious sheet 4 and the intermediate protective soil layer 11 to provide a triple water-impervious structure. This is the point. Thus, when the clay layer 17 (for example, bentonite mixed soil) is used, the water shielding property becomes higher.

  The preferred embodiment of the water shielding structure of the storage facility according to the present invention has been described above, but the present invention is not necessarily limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention. is there.

  For example, in the above two embodiments, the application electrode 7 and the measurement electrode 8 are provided only on the upper impermeable sheet 5 side of the double impermeable sheet, but also on the lower impermeable sheet 4 side. It is good also as a structure provided with the application electrode 7 and the measurement electrode 8. FIG. In this case, it is possible to check whether or not the lower water-impervious sheet 4 is damaged, and even when only the lower water-impervious sheet 4 is damaged, the damaged part can be repaired. In order to repair the breakage of the lower water-impervious sheet 4 in the embodiment of FIG. 6, it is necessary to provide an intermediate protective soil layer and an injection pipe between the clay layer 17 and the lower water-impervious sheet 4.

  Moreover, although it was set as the structure provided with an application electrode on the upper side of an upper impermeable sheet, and a measurement electrode on the lower side, it is good also as a structure provided with a measurement electrode on the upper side and an application electrode on the lower side instead.

  Further, the shape of the section is not limited to a quadrangle. Furthermore, instead of forming the partition portion by injection of the instantaneous setting injection material, the partition portion may be formed by on-site punching with a mold or by a resin-molded partition plate.

  The storage facility to which the present invention is applied is not limited to a disposal site. For example, the present invention can be applied to facilities intended for temporary storage of earth and sand.

DESCRIPTION OF SYMBOLS 1,20 ... Water shielding structure of disposal site (storage facility), 2 ... Partition part, 3 ... Injection pipe, 4 ... Lower water shielding sheet, 5 ... Upper water shielding sheet, 6a, 6b ... Nonwoven fabric, 7 ... Applied electrode, DESCRIPTION OF SYMBOLS 8 ... Measuring electrode, 9 ... Insulating part, 10 ... Protective soil, 11 ... Intermediate protective soil layer, 12 ... Hole (discharge part), 13 ... Damaged place, 14 ... Slow-fixing injection material, 15 ... Bottom part, 16 ... Compartment , 17 ... clay layer, A ... disposal site (storage facility).

Claims (1)

A lower impermeable sheet laid at the bottom of the storage facility;
An upper water shielding sheet laid above the lower water shielding sheet;
An intermediate protective soil layer provided between the lower impermeable sheet and the upper impermeable sheet,
The intermediate protective soil layer is divided into a plurality of partitions in the horizontal direction,
The upper water-impervious sheet is provided corresponding to the partition on either one of the upper and lower sides and applied with voltage, and the upper water-impervious sheet provided corresponding to the partition on the other side is damaged. A measuring electrode to be energized with the application electrode based on water leakage when,
In the intermediate protective soil layer, a plurality of injection pipes having a discharge portion for discharging a slow-binding injection material that penetrates the intermediate protective soil layer is disposed,
The discharge portions of the plurality of injection tubes are arranged for each of the sections ,
The partition part is formed by injecting an instantaneous setting material from the surface of the intermediate protective soil layer into the intermediate protective soil layer after providing the intermediate protective soil layer on the lower water-impervious sheet. seepage control structure of der Ru storage facilities thing was.