JP5111083B2 - Leakage repair method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a method for repairing a water leakage point generated in a water storage structure such as a dike, a reservoir, or a water tank, and more particularly, to a method for easily repairing without removing water from the water storage structure.

  Conventionally, a water storage structure such as an embankment, a basin, or a water tank is caused by an earthquake or ground subsidence, and water leakage may occur from the crack. In that case, in general, a water leaking portion is repaired by injecting or applying a water-stopping material to the cracks or providing a water shielding sheet.

  However, when repairing leaked points, it is usually necessary to remove the water once stored in the water storage structure and expose the cracks that become the leaked points to the atmosphere from the water. It takes time and cannot store water in the storage structure during the construction period.

  The present invention has been made in view of the above points, and is capable of repairing a water leakage location generated in the water storage structure without draining the water stored in the water storage structure by a simple method. It aims to provide a method.

In order to achieve the above object, the present invention is a method of repairing a water leakage spot generated in a water storage structure such as an embankment, a basin or a reservoir,
The hydraulic powder is poured into the water storage in the water storage structure, deposited in a part including the water leakage location in the water storage structure, and cured by curing for a predetermined period to form a water shielding layer. (First invention).

  According to the water leakage repair method of the present invention, the hydraulic powder deposited on the bottom of the water storage structure is cured by reacting with water to form a water shielding layer, whereby water in the water storage structure is formed. Since the flow to the water leakage point is blocked, no water leakage occurs. That is, since water leakage can be repaired without draining water, construction can be performed easily and water can be stored in the water storage structure during the construction period.

  According to a second aspect, in the first aspect, PFBC ash or a mixture of fly ash and cement is used as the hydraulic powder.

  Here, PFBC ash is ash discharged from a pressurized fluidized bed combined power generation (PFBC) type coal-fired power plant, and fly ash is pulverized coal from a coal-fired power plant. It is a by-product generated during combustion.

  That is, according to the water leakage repairing method of the present invention, the hydraulic powder used is mainly composed of industrial waste such as PFBC ash and fly ash, so that it can be procured at low cost and actively used for recycled products. Contributing to use can contribute to the formation of an environmental recycling society.

  3rd invention is a water storage structure, Comprising: Water leak repair was performed by the water leak repair method of 1st or 2nd invention, It is characterized by the above-mentioned.

  ADVANTAGE OF THE INVENTION According to this invention, the water leak repairing method which can repair the water leak location which generate | occur | produced in the water storage structure by extracting the water storage in a water storage structure by a simple method can be provided.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a flow for explaining the procedure of the water leakage repair method according to the present embodiment.

  As shown in FIG. 1, the water leakage repair method according to the present embodiment repairs a water leakage location generated at the bottom of a water storage structure such as an embankment, a basin, or a water tank, and the hydraulic powder 10 is stored in the water storage structure. Hydraulic powder charging step S10 for charging the water in the object 12, water bottom deposition step S20 for depositing the charged hydraulic powder 10 on the water bottom in the water storage structure 12, and hydraulic powder deposited on the water bottom It comprises curing step S30 in which 10 is allowed to stand for a predetermined period and cured to form a water shielding layer 14 by curing.

  As the hydraulic powder 10, PFBC ash or Geoseed (registered trademark) manufactured by Chugoku Electric Power Co., Inc. can be used.

  PFBC ash is ash discharged from a pressurized fluidized bed combined power generation (PFBC) type coal-fired power plant.

  Geoseed is a mixture of fly ash produced as a by-product when pulverized coal is burned in a coal-fired power plant and cement in a predetermined weight ratio. Specifically, fly ash and cement are mixed with 10%. Geoseed 10 having a weight ratio of 1: 1, Geoseed 20 having a weight ratio of 20: 1, and the like. In the present embodiment, either Geoseed 10 or Geoseed 20 may be used.

  In the hydraulic powder charging step S <b> 10, when the hydraulic powder 10 is charged into the stored water storage structure 12, the hydraulic powder 10 is compacted by its own weight when deposited on the bottom of the water storage structure 12. Then, an amount of the hydraulic powder 10 is introduced so that the thickness of the water-impervious layer 14 is formed when cured.

In the bottom sedimentation step S <b> 20, the water stored in the water storage structure 12 is not stirred as much as possible in order to quickly settle the hydraulic powder 10 in the water storage structure 12.
In the curing step S30, after charging, the hydraulic powder 10 deposited on the bottom of the water is allowed to stand for a predetermined period (for example, 1 to 4 weeks) in order to sufficiently cure.

  By doing in this way, the water-impervious layer 14 is formed in the water bottom part in the water storage structure 12, and since this will interrupt | block the distribution | circulation to the water leak location 16 of the water storage structure 12, a water leak arises. Disappear.

  Next, the strength of the PFBC ash and geoseed and the water shielding performance were examined, and the details will be described below. In addition, geoseed 20 and geoseed 10 were used for geoseed for evaluation.

  FIG. 2 is a process diagram showing a procedure for producing a specimen 22 to be a water shielding layer from a hydraulic powder.

  As shown in FIG. 2, a commercially available poly bucket 18 (upper diameter: 39 cm, lower end diameter: 30 cm, height: 48 cm, capacity: 45 L) is prepared, and a mold 20 (cylindrical mold for preparing a specimen) ( φ50 mm × height 100 mm), and 3% salt water 19 simulating seawater is poured into the poly bucket 18 to a height of 5 cm above the upper end of the mold 20 (see FIG. 2 (1), water injection at this time) Salt water 19 was 24 kg).

  Next, the hydraulic powder 10 to be tested is put into the poly bucket 18 (see FIG. 2 (2)), and then for a predetermined time (about 6 hours for PFBC ash, 24 hours for Geoseed). About) By standing, the hydraulic powder 10 is deposited in the mold 20 installed at the bottom of the poly bucket 18 (see FIG. 2 (3)).

In this study, two types of specimens 22 were produced for each of PFBC ash and geoseed, depending on the amount of charge into the polybucket 18.
FIG. 3 is a table summarizing the amount of PFBC ash or Geoseed input to the polybucket 18.

  As shown in FIG. 3, 41 kg (input case 1) and 30 kg (input case 2) for PFBC ash, 36 kg (input case 1) and 21 kg (input case 2) for Geoseed 20, and 36 kg (input) for Geoseed 10 A specimen 22 with case 1) and 22 kg (input case 2) was produced. That is, both the hydraulic powders 10 have a larger input amount in the input case 1 than in the input case 2.

  FIG. 4 is a table summarizing the thicknesses of deposits deposited on the bottom when PFBC ash or geoseed is deposited in the salt water 19 in the polybucket 18 for a predetermined time.

  As shown in FIG. 4, the thickness of the deposit when PFBC ash is charged is 45 cm when the charging amount is 1 case (41 kg), and 36 cm when the charging amount is 2 case (30 kg). Up to about 10 cm from the upper layer was soft enough to be easily pushed in with a rod or the like, but the layers below that were well tightened.

  Further, the thickness of the deposit when GeoSeed 20 is charged is 42 cm when the charged amount is Charge Case 1 (36 kg), and 29 cm when Charge Case 2 (21 kg) is charged. The thickness of the deposit is 41 cm when the input amount is 36 kg for the input case, and 26 cm when the input case 2 is 22 kg. The deposits of Geoseed 10 and 20 are sticks up to about 5 cm from the upper layer. However, the layers below that were well tightened.

  Finally, the mold 20 is taken out from the plastic bucket 18 and cured for a predetermined period in salt water 19 (concentration 3%, 20 ° C.) (see FIG. 2 (4)), and then the hydraulic powder deposited in the mold 20 is molded. By removing the mold from 20, a specimen 22 was produced (see FIG. 2 (5)). In addition, also about the curing period, the specimen 22 was produced by dividing into two types of 7 days and 28 days.

  And about each specimen 22 produced in this way, the compressive strength test (JIS A1108) of concrete, the uniaxial compressive strength test (JIS A1216) of soil, and the water permeability test (water level test, JIS A1218) were done.

  FIG. 5 is a table summarizing the results of the compressive strength test of concrete, the uniaxial compressive strength test of soil, and the permeability test of the specimen 22 cured for 7 days, and FIG. 6 shows the specimen 22 cured for 28 days. It is the table | surface which put together the result of the same test. In each test, a test was performed using a plurality of specimens 22 in the charging case 1 or the charging case 2 or both charging cases, and an average value thereof was obtained.

As shown in FIG. 5, the compressive strength of the specimen 22 was cured for 7 days, for PFBC ash 0.24 N / mm ^2, for Jioshido became about 0.10~0.38N / mm ^2. Uniaxial compressive strength, for PFBC ash 206kN / ^{m 2} approximately, for Jioshido became about 130~510kN / ^{m 2.} Further, the water permeability coefficient was about 3.6 × 10 ⁻⁴ cm / s for PFBC ash, and about 6.5 to 9.6 × 10 ⁻⁵ cm / s for Geoseed.

Further, as shown in FIG. 6, the compressive strength of the specimen 22 was cured for 28 days, for PFBC ash 1.9 N / mm ² approximately, becomes approximately 0.13~0.59N / mm ² for Jioshido also uniaxial compressive strength, for PFBC ash 1600kN / ^{m 2} about, become approximately 140~800kN / ^{m 2} for Jioshido strength increased as compared to those cured 7 days. Moreover, about the water permeability coefficient, PFBC ash became about 2.5 * 10 < ^-5 > cm / s, and geoseed became about 2.6-7.5 * 10 < ^-5 > cm / s.

FIG. 7 is a diagram showing the band of the hydraulic conductivity depending on the soil.
The permeability coefficient of the specimen 22 produced in this study is about 2.5 × 10 ⁻⁵ cm / s to 3.6 × 10 ⁻⁴ cm / s when the results of FIGS. 5 and 6 are summarized. 7 corresponds to fine sand or silt having a low hydraulic conductivity. That is, by putting PFBC ash or geoseed into the water storage structure 12, a certain compressive strength and water impermeability comparable to that of fine sand and silt are formed above the crack 16 generated at the bottom of the water storage structure 12. The water shielding layer 14 having the above is formed, and the flow of water in the water storage structure to the cracks is blocked.

  According to the water leakage repairing method according to the present embodiment described above, the hydraulic powder 10 such as PFBC ash or Geoseed is charged into the stored water storage structure 12 (hydraulic powder charging step S10), and the water is stored. The hydraulic powder 10 charged into the structure 12 is deposited on the bottom of the water storage structure 12 (water bottom deposition step S20), and the hydraulic powder 10 deposited on the bottom of the water storage structure 12 is predetermined. By curing for a period (curing step S30) and forming the water-impervious layer 14, the hydraulic powder 10 reacts with the water in the water storage structure 12 and hardens at the bottom of the water storage structure 12 to provide water shielding. Since the layer 14 is formed and the flow of the water in the water storage structure 12 to the water leakage point is blocked, the water leakage does not occur. That is, since the leakage can be repaired without draining water, the construction can be easily performed, and water can be stored in the water storage structure 12 during the construction period.

  Further, according to the water leakage repair method according to the present embodiment, by using PFBC ash or Geoseed as the hydraulic powder 10, PFBC ash and Geoseed are mainly composed of industrial waste, so that they can be procured at low cost. At the same time, it can contribute to the formation of an environmental recycling society by contributing to the active use of recycled products.

  In the water leakage repair method according to the present embodiment, PFBC ash or geoseed is used as the hydraulic powder 10, but is not limited thereto, and is in the form of a powder made of a hydraulic material such as cement. Anything may be used as long as it is.

It is a flow for demonstrating the procedure of the water leak repair method which concerns on this embodiment. It is process drawing which shows the procedure until producing the test piece 22 of a water shielding layer from hydraulic powder. It is a table | surface which shows the input amount to the poly bucket 18 of PFBC ash or geoseed. It is the table | surface which put together the thickness of the deposit deposited on the bottom part when PFBC ash or geoseed was deposited in the salt water 19 in the poly bucket 18 for the predetermined time. It is the table | surface which put together the result of the compressive strength test of concrete, the uniaxial compressive strength test of soil, and the water permeability test of the specimen 22 cured for 7 days. It is the table | surface which put together the result of the compressive strength test of concrete, the uniaxial compressive strength test of the soil, and the water permeability test of the specimen 22 cured for 28 days. It is a figure which shows the zone | band of the hydraulic conductivity by soil quality.

Explanation of symbols

10 Hydraulic powder 12 Water storage structure 14 Water shielding layer 16 Crack (water leakage location)
18 Poly bucket 20 Mold 22 Specimen S10 Hydraulic powder charging step S20 Bottom sedimentation step S30 Curing step

Claims (3)

It is a method of repairing leak points in water storage structures such as dikes, reservoirs and reservoirs,
The hydraulic powder is poured into the water storage in the water storage structure, deposited in a part including the water leakage location in the water storage structure, and cured by curing for a predetermined period to form a water shielding layer. Water leakage repair method characterized by.   The water leakage repair method according to claim 1, wherein PFBC ash or a mixture of fly ash and cement is used as the hydraulic powder.   A water storage structure that has been subjected to water leakage repair by the water leakage repair method according to claim 1.

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