JP2016223849A - Water leakage amount measuring apparatus and measuring method of impervious wall structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water leakage amount measuring apparatus and measuring method of an impervious wall structure capable of quantitatively measuring a minute amount of water leak even when there is no water level difference.SOLUTION: An apparatus 100 for measuring the amount of water leak from an impervious wall structure 10 for water shielding erected underwater includes: water sampling means 24 including a container 22 having an opening 20 water-tightly fixed to one side surface 10a of the impervious wall structure 10; and pressure adjusting means for putting, into a state of a predetermined atmospheric pressure, the inside of the container 22 of the water sampling means 24 water-tightly fixed to one side surface 10a of the impervious wall structure 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an apparatus and method for measuring the amount of water leakage in a water shielding wall structure that requires high water shielding performance, such as a waste sea surface disposal site, and in particular, a vertical shielding made of a steel sheet pile having a joint. The present invention relates to a leakage amount measuring apparatus and a measuring method for measuring the leakage amount of a water wall structure on site.

  Conventionally, in the construction of a waste sea surface disposal site and the like, a vertical impermeable wall surrounding the disposal site is installed by arranging a number of steel sheet piles and steel pipe sheet piles adjacent to the sea. Since this vertical impermeable wall is formed by a number of steel sheet piles and steel pipe sheet piles connected via joints, there is a risk that water leakage will occur from the joint parts if not properly constructed. For this reason, it is necessary to confirm that the water can be reliably blocked after the installation of the water blocking wall, but since the joint shape is complicated, for example, the following methods (1) to (3) have been applied so far. It has been.

(1) As a general method, as shown in FIGS. 10A to 10C, after the installation of the vertical impermeable wall 1 is completed, the inner water cut off by the vertical impermeable wall 1 is pumped. 2 and so on, creating a water level difference between the inside and outside of the vertical impermeable wall 1, and the diver 4 submerged in the sea confirms the presence or absence of water leakage W from the joint portion 3 of the vertical impermeable wall 1 by visual inspection or palpation. (For example, see Patent Document 1).

(2) As a method that does not rely on the diver's visual inspection etc., as in (1) above, create a water level difference inside and outside the vertical impermeable wall, and hang the flow rate detector vertically from the joint to There is a method for detecting the amount of water leakage (flow rate) (see, for example, Patent Document 1).

(3) Other methods include a water leak detection method using a tracer and a method of providing an observation well (see, for example, Patent Documents 2 and 3).

JP-A-6-94563 JP 2006-150202 A JP 2004-49959 A

  However, in the above method (1), since all the steel sheet piles or steel pipe sheet piles constituting the vertical impermeable wall can be drained only after completion of the installation, for example, the construction divided in the year construction work, etc. There is a problem that it is difficult to form a water level difference when a different contractor constructs for each section or during construction, making it difficult to check for water leakage, and the responsibility for construction quality is unclear.

  Moreover, the reference value of the water shielding performance is usually set on the water shielding wall of the waste disposal site. For example, the water permeability is defined as 1.0 × 10 −6 cm / s and the thickness is defined as 50 cm or more. At this time, for example, the amount of water that permeates from a 1 m2 wall in one minute at a water pressure of 30 kPa (corresponding to a water level difference of 3 m) is 3.6 cm3. In vertical impermeable walls using steel sheet piles or steel pipe sheet piles, water leakage is thought to occur only at the joints, so in the above example, in order to clarify by measurement that the water shielding performance is satisfied. It is necessary to prove that the amount of water leakage from the joint part included in the 1 m2 wall is smaller than 3.6 cm3 per minute. Thus, when there is little amount of water leaks, there also exists a problem that it is difficult to grasp | ascertain the amount of water leaks quantitatively by the visual check by a diver.

  In the method (2), since the flow meter is used, it is possible to grasp the quantitative amount of water leakage. However, such a flow meter is not intended for vertical water-impervious walls such as sea surface disposal sites where high water-impervious performance is required, and cannot be detected with a small amount of water leakage as described above.

  Although the detection method using the tracer of (3) above can detect water leakage even with a small amount of water leakage, it is difficult to quantitatively grasp the amount of water leakage. The method of installing an observation well has a problem that only the location where the well is installed can be measured.

  In either of the above methods (2) and (3), it is necessary to create a water level difference between the inside and outside of the vertical impermeable wall, so after the installation of the entire vertical impermeable wall surrounding the disposal site is completed There is a problem that it cannot be measured without it.

  The present invention has been made in view of the above, and provides a water leakage amount measuring device and a measurement method of a water shielding wall structure capable of quantitatively measuring a small amount of water leakage even if there is no difference in water level. For the purpose.

  In order to solve the above-described problems and achieve the object, the water leakage amount measuring device for a water shielding wall structure according to the present invention measures the amount of water leakage from the water shielding wall structure for water shielding standing in water. A water sampling means comprising a container having an opening that is watertightly fixed to one side surface of the impermeable wall structure, and the watertightly fixed to one side surface of the impermeable wall structure Pressure adjusting means for bringing the inside of the container of the water sampling means into a predetermined atmospheric pressure state.

  Further, in the above-described invention, the apparatus for measuring a leakage amount of the other impermeable wall structure according to the present invention is characterized in that the pressure adjusting means is the water sampling means fixed on one side surface of the impermeable wall structure in a watertight manner. The inside of the container is drained, and the inside of the container is brought to a predetermined atmospheric pressure state.

  In addition, in the above-described invention, the apparatus for measuring a leakage amount of a water shielding wall structure according to the present invention includes the water shielding material that enters the inside of the container that has been brought into a predetermined atmospheric pressure state by the pressure adjusting means through the opening. It further comprises a water leakage amount measuring means for measuring the amount of water leakage from the wall structure.

  Moreover, in the above-described invention, the apparatus for measuring a leakage amount of a water-impervious wall structure according to the present invention is characterized in that the pressure adjusting means brings the inside of the container to an atmospheric pressure state or lower. .

  Moreover, the water leak amount measuring apparatus of another water-impervious wall structure according to the present invention is characterized in that, in the above-described invention, the container is configured such that water leaking into the container is visible from the outside.

  Moreover, in the above-described invention, the water leakage amount measuring apparatus of the other impermeable wall structure according to the present invention is configured such that the pressure adjusting means is arranged such that one end communicates with the inside of the container and the other end is in the air. An air hose, a drain hose with one end communicating with the inside of the container and the other end communicating with a water tank provided outside the container, and a vacuum pump connected with the water tank. It is characterized by comprising.

  In addition, in the above-described invention, the water leakage amount measuring device for another impermeable wall structure according to the present invention is a vertical impermeable structure in which the impermeable wall structure is configured by a steel sheet pile or a steel pipe sheet pile connected via a joint. It is a wall, and the opening of the container is arranged in a manner straddling the joint portion, and has a shape that can be watertightly fixed to the steel sheet pile or steel pipe sheet pile including the joint portion. .

  Further, the water leakage amount measuring device of another water-impervious wall structure according to the present invention is the elastic body having hardness that follows the water-impervious wall and does not deform the edge of the opening of the container in the above-described invention. It is characterized by comprising.

  Further, the method for measuring the amount of water leakage of the impermeable wall structure according to the present invention is a method for measuring the amount of water leakage from the impermeable wall structure for impermeable water standing in water, wherein the impermeable wall structure After fixing the said opening part of the water sampling means which consists of a container which has an opening part to one side of this, the inside of the said container is made into a predetermined | prescribed atmospheric pressure state, It is characterized by the above-mentioned.

  Further, according to another water-impervious wall structure measuring method according to the present invention, in the above-described invention, after the opening is fixed to one side surface of the water-impervious wall structure, water inside the container is drained. The inside of the container is set to a predetermined atmospheric pressure state.

  Further, according to another water-impervious wall structure measuring method according to the present invention, in the above-described invention, the water-impervious wall that enters the inside of the container through the opening after the inside of the container is brought to a predetermined atmospheric pressure state. It is characterized by measuring the amount of water leakage from the wall structure.

  Moreover, the water leak amount measuring method for another impermeable wall structure according to the present invention is characterized in that, in the above-described invention, the inside of the container is brought into an atmospheric pressure state or a pressure state lower than that.

  Moreover, the water leak amount measuring method of another water-impervious wall structure according to the present invention is characterized in that, in the above-described invention, the container is configured such that water leaking into the container is visible from the outside.

  Further, the water leakage amount measuring method for another impermeable wall structure according to the present invention is the invention described above, wherein the opening of the container is temporarily fixed to one side surface of the impermeable wall structure, and then the interior of the container The opening of the container is fixed to one side surface of the water shielding wall structure in a watertight manner, and the interior of the container is brought into a predetermined atmospheric pressure state.

  Moreover, the water leakage amount measuring method of another impermeable wall structure according to the present invention is the above-described invention, wherein one end is in communication with the inside of the container and the other end is disposed in the air, In a configuration having one end communicating with the inside of the container and the other end communicating with a water tank provided outside the container, and a vacuum pump connected to the water tank, the vacuum pump Actuates and sucks water inside the container through the water storage tank and the drain hose, and fixes the opening of the container to one side surface of the water shielding wall structure, and the container It is characterized in that the inside of the is brought to a predetermined atmospheric pressure state.

  In addition, in the above-described invention, the water leakage amount measuring method for another impermeable wall structure according to the present invention is the vertical impermeable structure in which the impermeable wall structure is constituted by a steel sheet pile or a steel pipe sheet pile connected via a joint. It is a wall, and the opening of the container is arranged in a manner straddling the joint portion, and has a shape that can be watertightly fixed to the steel sheet pile or steel pipe sheet pile including the joint portion. .

  The water leakage measuring method for another water-impervious wall structure according to the present invention is the elastic body provided with the hardness that follows the water-impervious wall and does not deform the edge of the opening of the container in the invention described above. It is characterized by comprising.

  According to the apparatus for measuring the amount of water leakage of the impermeable wall structure according to the present invention, the apparatus for measuring the amount of water leakage from the impermeable wall structure for the impermeable water standing in the water, the impermeable wall structure Water sampling means comprising a container having an opening fixed on one side of the water-tight structure, and a predetermined atmospheric pressure inside the container of the water sampling means fixed on one side of the impermeable wall structure. Pressure adjusting means for bringing the container into a state, and by bringing the inside of the container to a predetermined atmospheric pressure state (for example, atmospheric pressure), the inside of the container and the other side surface of the impermeable wall structure at the same depth as the container In the meantime, it is possible to create a water head difference according to the installation depth of the container and the atmospheric pressure state. Due to this water head difference, an osmotic flow from the other side surface of the impermeable wall structure toward the opening of the container is generated and accumulated as water leakage inside the container. If the amount stored in the container per predetermined time is measured, the amount of water leakage can be measured. Therefore, according to the present invention, even if there is no difference in water level between the inside and outside of the impermeable wall structure, it is possible to quantitatively measure a small amount of water leakage from the impermeable wall structure.

FIG. 1 is a side cross-sectional view illustrating an embodiment of a water leakage amount measuring apparatus and measurement method for a water shielding wall structure according to the present invention, and (1) is a case where there is no water level difference inside and outside a vertical water shielding wall. (2) When there is a water level difference, (3) is a diagram when a water head difference is created according to the present invention. FIG. 2 is a plan sectional view of a vertical impermeable wall made of steel sheet piles. FIG. 3 is a schematic perspective view showing an embodiment of a water leakage amount measuring apparatus having a water shielding wall structure according to the present invention. FIG. 4 is a schematic perspective view of the container as seen from the opening. FIG. 5: is the figure of the process 1 which shows embodiment of the water leak amount measuring method of the impermeable wall structure concerning this invention. FIG. 6 is a schematic perspective view showing an example in which the container is temporarily fixed by the temporary fixing means. FIG. 7 is a schematic perspective view showing a state where a gap at the upper end of the container is closed with a caulking material. FIG. 8: is the figure of the process 2 which shows embodiment of the water leak amount measuring method of the impermeable wall structure concerning this invention. FIG. 9: is the figure of the process 3 which shows embodiment of the water leak amount measuring method of the impermeable wall structure concerning this invention. 10A and 10B are explanatory diagrams of a conventional method for confirming the presence or absence of water leakage from a vertical impermeable wall, wherein FIG. 10A is a top view showing a state where the vertical impermeable wall is closed, and FIG. 10B is a vertical impermeable wall. (C) is the perspective view which looked at the vertical impermeable wall from the outside.

  DESCRIPTION OF EMBODIMENTS Embodiments of a water leakage measuring device and a measuring method for a water shielding wall structure according to the present invention will be described below in detail based on the drawings. Note that the present invention is not limited to the embodiments.

[Measurement device for water leakage of impermeable wall structure]
First, the water leak amount measuring apparatus having the impermeable wall structure according to the present invention will be described.

  As shown in FIG. 1 (1), a vertical impermeable wall 10 (impermeable wall structure) is erected from the seabed ground G to the sea level WL. As shown in FIG. 2, the vertical water-impervious wall 10 includes a large number of steel sheet piles 14 that are connected by fitting the side joints 12 together.

  As shown in FIG. 1 (1), the underwater (underwater) is divided into an outer side 16 and an inner side 18 by a vertical impermeable wall 10, and the area of the inner side 18 is reclaimed by waste in the future, and the waste sea level. It becomes a disposal site. Immediately after the vertical impermeable wall 10 is erected, there is no water head difference Δh between the outer side 16 and the inner side 18, so there is no leakage from the vertical impermeable wall 10.

  As shown in FIG. 1 (2), when the water level on the inner side 18 is lowered to create the water head difference Δh, water leakage W from the outer side 16 to the inner side 18 of the vertical impermeable wall 10 occurs. In the past, this condition was created and the amount of water leakage was measured.

  On the other hand, as shown in FIG. 1 (3), the water leakage measuring device 100 with the impermeable wall structure according to the present invention has an opening 20 that is watertightly fixed to the inner side surface 10 a of the vertical impermeable wall 10. The water sampling means 24 which consists of the container 22 which has, and the pressure adjustment means which is not shown in figure which makes the inside of the container 22 a predetermined | prescribed atmospheric pressure state are provided. By using the water leakage amount measuring apparatus 100 having the impermeable wall structure according to the present invention, the water level difference between the outer side 16 and the inner side of the container 22 is not formed between the outer side 16 and the inner side 18 as shown in FIG. It is possible to create a hydraulic head difference Δh between them. The configuration of the water leakage measuring device 100 will be specifically described below.

  FIG. 3 is a configuration diagram of the water leakage measuring device 100 having a water shielding wall structure according to the present invention. As shown in this figure, a water leakage measuring device 100 having a water-impervious wall structure according to the present invention includes a container 22 having an opening 20 that is watertightly fixed to an inner side surface 10a of a vertical water-impervious wall 10. Means 24 and pressure adjusting means 26 for bringing the inside of the container 22 into a predetermined atmospheric pressure state are provided.

  FIG. 4 shows the container 22 of the water sampling means 24 as seen from the opening 20. As shown in this figure and FIG. 3, the container 22 is a rectangular parallelepiped box having one side opened, and is made of transparent acrylic so that water leaking into the container 22 can be visually recognized from the outside. is there. By doing so, it is possible to easily confirm the installation situation and water leakage situation inside the container 22 from the outside.

  The container 22 is installed on the vertical impermeable wall 10 by a diver. For this reason, it is preferable that the size and weight of the container 22 be a size and weight that can be carried by human power, but it is also possible to have a size that can measure the amount of water leakage in the entire length of the joint 12. However, if it is too small, the length of the joint to be measured will be shortened, so the amount of water leakage will be reduced and it will take time for measurement. 30 cm long, 20 cm wide and 15 cm deep).

  As shown in FIG. 3, the opening 20 of the container 22 is arranged in a manner straddling the portion of the joint 12, so that it is formed in a stepped shape according to the shape of the portion of the joint 12, and includes the portion of the joint 12. The steel sheet pile 14 can be fixed in a watertight manner.

  However, since the joint 12 of the vertical impermeable wall 10 has a margin in the fitting portion in consideration of workability, not all the joints 12 have the same shape, and the opening 20 has various shapes of the joint 12. It is necessary to have a structure that can be in close contact with. Therefore, a rubber 28 having a predetermined deformation performance and capable of ensuring watertightness when attached to the side surface 10a is attached to the edge of the opening 20 that contacts the side surface 10a of the vertical impermeable wall 10. By attaching the rubber 28, the water around the container 22 does not enter the inside of the container 22.

  If the rubber 28 is too hard, the rubber 28 does not adhere to the shape of the joint 12. If the rubber 28 is too soft, the water inside the container 22 may be deformed by water pressure outside the container 22. For this reason, it is desirable that the rubber 28 is made of rubber having an Asker C hardness of about 10 degrees according to the Japan Rubber Association standard SRISO 101. In this way, when the opening 20 is fixed in a watertight manner across the joint 12 portion, the rubber 28 is deformed according to the shape of the joint 12 portion to improve the adhesion, and thereafter the inside of the container 22 is increased. It is possible to prevent the rubber 28 from being excessively deformed when the pressure is changed to a predetermined atmospheric pressure state.

  A coupler 32 incorporating a valve is provided on the upper surface 22a of the container 22, and a coupler 36 incorporating a valve is provided on the lower surface 22b of the container 22. Further, a U-shaped grip 30 is provided on the upper surface 22a of the container 22 so as to be portable. By doing so, the container 22 can be easily fixed to the side surface 10a of the vertical impermeable wall 10 by human power such as a diver.

  The pressure adjusting means 26 is for draining the water inside the container 22 of the water sampling means 24 fixed to the side surface 10a of the vertical impermeable wall 10 so that the inside of the container 22 is in a predetermined atmospheric pressure state. is there. The pressure adjusting means 26 has one end communicating with the inside of the container 22 through the coupler 32 and the other end disposed in the air, and one end with the inside of the container 22 through the coupler 36. The drainage hose 38 communicated with the water storage tank 40 provided at the other end of the container 22 and the vacuum pump 42 connected to the water storage tank 40. A portable generator 44 for driving is connected to the vacuum pump 42. The present invention can quantitatively measure a small amount of water leakage from the vertical impermeable wall 10 with such a simple configuration.

  Further, the water leakage amount measuring apparatus 100 measures the amount of water leakage (not shown) that measures the amount of water leakage from the vertical impermeable wall 10 that enters the inside of the container 22 that has been brought into a predetermined atmospheric pressure state by the pressure adjusting means 26 through the opening 20. Means are further provided.

  As this water leakage amount measuring means, a scale for measuring the amount of water accumulated inside is attached to the side of the container 22, and the amount of water leakage is measured by dividing the amount of water read from the scale every predetermined elapsed time. Can be used. Alternatively, a method may be used in which a water collecting tank such as a bottomed cylinder is provided on the lower surface 22b of the container 22 and the amount of water leakage is measured by this water collecting pot.

The operation and action of the above configuration will be described.
After fixing the container 22 so as to straddle the joint 12 portion of the side surface 10a of the vertical impermeable wall 10, the vacuum pump 42 is operated to drain water inside the container 22 through the water storage tank 40 and the drainage hose 38. Suction is performed to fix the opening 20 of the container 22 to the side surface 10a of the vertical impermeable wall 10 in a watertight manner, and the inside of the container 22 is set to a predetermined atmospheric pressure state (for example, atmospheric pressure).

  By doing so, as shown in FIG. 1 (3), the installation depth of the container 22 and the atmospheric pressure between the inside of the container 22 and the other side surface of the vertical impermeable wall 10 at the same depth as the container 22. The water head difference Δh according to the state can be easily created.

  Further, due to the water head difference Δh, a water leak W due to an osmotic flow from the inner side 18 of the vertical impermeable wall 10 toward the opening 20 of the container 22 occurs and accumulates inside the container 22. The amount of water leakage can be measured by measuring the amount stored in the container 22 per predetermined time. Therefore, according to the present invention, even if there is no difference in water level between the inside and outside of the vertical impermeable wall 10, a small amount of water leakage from the vertical impermeable wall 10 can be quantitatively measured. For this reason, in the sea surface disposal site construction plan, it is possible to measure the amount of water leakage from the joint even when all the vertical impermeable walls are not completed.

  Further, when water inside the container 22 that is watertightly fixed to the side surface 10a of the vertical impermeable wall 10 is drained, the external water pressure becomes relatively larger than that inside the container 22, and the container 22 is placed on the side surface 10a. Since the pressing force increases, the adhesion of the opening 20 of the container 22 to the side surface 10a can be improved. Thereby, it becomes possible to efficiently measure only the amount of water leakage from the joint 12 portion.

  In the above embodiment, the pressure adjusting means 26 opens and closes the opening degree of the valves built in the couplers 32 and 36, or adjusts the output of the vacuum pump 42 to adjust the inside of the container 22 to the atmospheric pressure or less. In any case, the atmospheric pressure inside the container 22 during the leakage measurement needs to be kept constant. In this way, a desired water head difference can be created. If the pressure is smaller than the atmospheric pressure, it becomes possible to create a larger head difference, and the leaking power of the leaked water from the vertical impermeable wall 10 is increased to increase the amount of leaked water. By increasing the amount of water leakage, the measurement time of the amount of water leakage can be shortened.

  Moreover, in said embodiment, as shown in FIG. 6, you may further provide the temporary fixing means 50 for temporarily fixing the opening part 20 of the container 22 to the side surface 10a of the vertical impermeable wall 10. The temporary fixing means 50 can be comprised, for example with the U-shaped arm 46 and the magnet 48 provided in the both ends. If the arm 46 is pressed toward the side surface 10 a from the rear surface of the container 22, the container 22 is easily temporarily fixed to the side surface 10 a by the magnetic force of the magnet 48. By doing so, it is possible to easily fix the container 22 in the initial stage of the work.

  In the above embodiment, as shown in FIG. 7, the caulking material 52 is provided in the gap at the upper end portion 12 a of the joint 12 where the opening 20 of the container 22 is fixed in a watertight manner and the gap at the lower end portion (not shown). It is preferable to close the gap by applying a coating or the like. This is because gaps are likely to be formed at the upper and lower ends of the joint 12. By closing the gap, water can be prevented from entering the inside of the container 22 from the gap, and the water tightness of the container 22 can be further ensured.

[Measurement method of water leakage of impermeable walls]
Next, a method for measuring the amount of water leakage of the impermeable wall structure according to the present invention will be described.

  The method for measuring the amount of water leakage of the impermeable wall structure according to the present invention is a method for measuring the amount of water leakage from the vertical impermeable wall 10 using the water leakage amount measuring device 100 having the above-described impermeable wall structure. In this method, as shown in FIG. 1 (3), after fixing the opening 20 of the container 22 to the side surface 10 a of the vertical impermeable wall 10, the inside of the container 22 is brought into a predetermined atmospheric pressure state, and the container is passed through the opening 20. The amount of water leakage from the vertical impermeable wall 10 entering the inside of the wall 22 is measured.

  A specific procedure of the method for measuring the amount of water leakage of the impermeable wall structure according to the present invention will be described.

  First, in order to ensure the adhesion of the container 22 to the joint, rust and deposits generated on the side surface 10a of the vertical impermeable wall 10 are removed by scrubbing or the like.

  Then, as shown in Step 1 of FIG. 5, the opening of the container 22 of the water sampling means 24 on the side surface 10 a in a manner straddling the portion of the joint 12 of the vertical impermeable wall 10 near the sea surface WL by the diver's manual work. 20 is temporarily fixed.

  If the container 22 is temporarily fixed at a position below the sea level, the interior of the container 22 is filled with water. Since the inside and outside of the vertical impermeable wall 10 are at the same water level, there is no water head difference between the inside of the container 22 and the outer side 16 of the vertical impermeable wall 10. Also, if the container 22 is temporarily fixed near the sea level WL at low tide, the entire container 22 can be completely submerged by the subsequent rise in the tide level, and a desired installation water depth can be created, which is desirable in terms of work safety. .

  Further, as shown in FIG. 6, the container 22 may be temporarily fixed by temporary fixing means 50 including a U-shaped arm 46 and magnets 48 provided at both ends thereof. In this case, if the arm 46 is pressed from the rear surface of the container 22 toward the side surface 10 a, the container 22 is easily temporarily fixed to the side surface 10 a by the magnetic force of the magnet 48. By doing so, it is possible to easily fix the container 22 in the initial stage of the work.

  Further, as shown in FIG. 7, a caulking material 52 or the like is applied to the gap at the upper end portion 12a of the joint 12 where the opening 20 of the container 22 is fixed in a watertight manner and the gap at the lower end portion (not shown). Is preferably closed beforehand. This is because gaps are likely to be formed at the upper and lower ends of the joint 12. By closing the gap, water can be prevented from entering the inside of the container 22 from the gap, and the water tightness of the container 22 can be further ensured.

  Subsequently, as shown in Step 2 in FIG. 8, the air hose 34 and the water draining hose 38 are respectively connected to couplers (not shown) on the upper and lower surfaces of the container 22. The end of the air hose 34 is left in the air.

  Subsequently, as shown in step 3 of FIG. 9, the water tank 40, the vacuum pump 42, and the portable generator 44 are transported to the container 22 by a boat or the like, and the end of the drain hose 38 is transferred to the water tank 40. Connecting.

  The vacuum pump 42 is operated in a state where the entire container 22 is completely submerged under the sea surface due to the rise in the tide level thereafter. Thereby, the inside of the water storage tank 40 is evacuated, and the water inside the container 22 is drained through the draining hose 38. Air enters from the air hose 34 and an atmospheric pressure state is created inside the container 22.

  By doing so, a water head difference corresponding to the water depth from the sea surface to the bottom surface of the container 22 is formed between the outside 16 of the vertical impermeable wall 10 and the inside of the container 22. Water leaks from the joint 12 through the opening 20. On the other hand, the water pressure in the direction of pushing the container 22 toward the joint 12 by the surrounding water acts on the container 22. This water pressure has a magnitude corresponding to the created head difference. This working water pressure makes it difficult for surrounding water to enter the inside of the container 22, and water-tightness with respect to the water around the container 22 is ensured.

  In the above embodiment, the inside of the container 22 does not necessarily need to be in the atmospheric pressure state, and the air pressure may be further lowered to promote water leakage from the joint 12, but the air pressure inside the container 22 is constant. It is necessary to keep it in a state.

  Further, in the initial stage of starting to drain water from the container 22 with the vacuum pump 42, the container 22 is lightly pressed against the vertical impermeable wall 10 by a diver, and the adhesion is maintained so that water does not enter the container 22 from the outside. Is desirable.

  By measuring the amount of water leaked from a point in time when the water inside the container 22 has completely drained up to a certain time, the converted permeability coefficient that serves as an index of the water shielding performance can be grasped by the following equation (1). it can.

K = Q / (i × A) (1)
However,
K: Converted hydraulic conductivity when wall thickness is 50 cm Q: Cumulative amount of leaked water / Elapsed time at leak rate i: Hydrodynamic gradient. In the case of a head difference Δh, i = Δh / 50
A: Evaluation area. A = the height of the container × the joint interval of the water shielding wall.

  For example, if the height of the container 22 is 30 cm, the joint interval of the vertical impermeable walls 10 is 60 cm, the water head difference is 200 cm, and the amount of water leakage after 2 hours is 10 cm3, the converted permeability coefficient of the 50 cm wall thickness is From the formula (1), 1.93 × 10 −7 cm / s.

  As described above, according to the present invention, by removing the water inside the container 22 that is watertightly fixed to the joint 12, the inside of the container 22 and the same depth as the container 22 are formed as shown in FIG. A water head difference Δh according to the installation depth of the container 22 and the atmospheric pressure state can be easily created between the vertical side wall 10 and the other side surface. Moreover, since the container 22 will closely_contact | adhere with the vertical water-impervious wall 10 by the external water pressure if the water inside the container 22 is drained, it will become possible to measure only the amount of water leakage from the part of the joint 12 efficiently.

  Further, due to the water head difference Δh, a water leak W due to an osmotic flow from the outer side 16 of the vertical impermeable wall 10 toward the opening 20 of the container 22 occurs and accumulates inside the container 22. The amount of water leakage can be measured by measuring the amount stored in the container 22 per predetermined time. Therefore, according to the present invention, even if there is no difference in water level between the inside and outside of the vertical impermeable wall 10, a small amount of water leakage from the vertical impermeable wall 10 can be quantitatively measured. For this reason, in the sea surface disposal site construction plan, it is possible to measure the amount of water leakage from the joint even when all the vertical impermeable walls are not completed.

  In addition, in said embodiment, although demonstrated taking the case of the vertical impermeable wall 10 which consists of the steel sheet pile 14, this invention is not restricted to this, For example, from many steel pipe sheet piles connected with the joint. It can also be applied to vertical water-impervious walls, seamless water-impervious walls by joints, and water-impervious walls made of concrete, cement-based materials, or other materials. The effect of this can be achieved.

  As described above, according to the water leakage amount measuring device for a water shielding wall structure according to the present invention, it is a device for measuring the water leakage amount from a water shielding wall structure for water shielding standing in water. A water sampling means comprising a container having an opening that is watertightly fixed to one side surface of the water shielding wall structure; and the container of the water sampling means watertightly fixed to one side surface of the water shielding wall structure. Pressure adjusting means for bringing the interior of the container into a predetermined atmospheric pressure state, so that the interior of the container and the water-impervious wall at the same depth as the container by making the interior of the container a predetermined atmospheric pressure state (for example, atmospheric pressure) A water head difference can be created between the other side of the structure and the depth of the container and the atmospheric pressure. Due to this water head difference, an osmotic flow from the other side surface of the impermeable wall structure toward the opening of the container is generated and accumulated as water leakage inside the container. If the amount stored in the container per predetermined time is measured, the amount of water leakage can be measured. Therefore, according to the present invention, even if there is no difference in water level between the inside and outside of the impermeable wall structure, a minute amount of water leakage from the impermeable wall structure can be quantitatively measured.

  Moreover, according to the water leakage amount measuring apparatus of another impermeable wall structure according to the present invention, the pressure adjusting means is provided on the container of the water sampling means fixed on one side surface of the impermeable wall structure. Since the water inside the container is drained and the inside of the container is brought to a predetermined atmospheric pressure state, a water head difference can be easily formed between the inside of the container and the other side of the impermeable wall structure at the same depth as the container. Can be produced. Moreover, since the external water pressure becomes relatively larger than the inside of the container, the adhesion of the opening of the container to the side surface can be enhanced.

  Moreover, according to the water leakage amount measuring apparatus of another water-impervious wall structure according to the present invention, from the water-impervious wall structure that enters the inside of the container that has been brought into a predetermined atmospheric pressure state by the pressure adjusting means through the opening. Since the water leakage amount measuring means for measuring the amount of water leakage is further provided, a small amount of water leakage from the impermeable wall structure can be measured quantitatively.

  Further, according to the water leakage amount measuring apparatus having another impermeable wall structure according to the present invention, the pressure adjusting means brings the inside of the container into an atmospheric pressure state or a pressure state lower than that, and thus creates a desired water head difference. be able to. If the pressure is smaller than the atmospheric pressure, it becomes possible to create a larger water head difference, and the leakage power from the water shielding wall structure increases and the amount of water leakage increases. By increasing the amount of water leakage, the measurement time of the amount of water leakage can be shortened.

  In addition, according to the water leakage amount measuring apparatus having another impermeable wall structure according to the present invention, since the container is configured so that the water leaking into the container can be visually recognized from the outside, the water leakage situation inside the container is determined. It can be easily confirmed from the outside.

  Further, according to the water leakage amount measuring apparatus having another impermeable wall structure according to the present invention, the pressure adjusting means is for inflating with one end communicating with the inside of the container and the other end disposed in the air. Since the hose, one end communicated with the inside of the container, the other end communicated with a water tank provided outside the container, and a vacuum pump connected to the water tank, With a simple configuration, a small amount of water leakage from the impermeable wall structure can be measured quantitatively.

  Moreover, according to the water leakage amount measuring apparatus of another impermeable wall structure according to the present invention, the impermeable wall structure is a vertical impermeable wall constituted by a steel sheet pile or a steel pipe sheet pile connected via a joint. The opening of the container is arranged in a manner straddling the joint portion, and is shaped to be watertightly fixed to the steel sheet pile or steel pipe sheet pile including the joint portion. Even if there is no difference in water level between the inside and outside of the configured vertical impermeable wall, it is possible to quantitatively measure a slight amount of water leakage from the joint portion.

  Further, according to the water leakage amount measuring apparatus of another water-impervious wall structure according to the present invention, the edge of the opening of the container is configured by an elastic body having a hardness that follows the water-impervious wall and does not deform. So, for example, when the opening is fixed in a watertight manner across the joint part, the rubber is deformed according to the shape of the joint part to improve the adhesion, and then the inside of the container is brought to a predetermined atmospheric pressure state. In addition, excessive deformation of the rubber can be suppressed.

  Further, according to the method for measuring the amount of water leakage of the impermeable wall structure according to the present invention, there is provided a method for measuring the amount of water leakage from the impermeable wall structure for impermeable water standing in water, After fixing the opening of the water sampling means composed of a container having an opening on one side of the wall structure, the inside of the container is brought into a predetermined atmospheric pressure state. By making the atmospheric pressure), it is possible to create a water head difference between the interior of the container and the other side of the impermeable wall structure at the same depth as the container, according to the depth of the container and the atmospheric pressure. . Due to this water head difference, an osmotic flow from the other side surface of the impermeable wall structure toward the opening of the container is generated and accumulated as water leakage inside the container. If the amount stored in the container per predetermined time is measured, the amount of water leakage can be measured. Therefore, according to the present invention, even if there is no difference in water level between the inside and outside of the impermeable wall structure, a minute amount of water leakage from the impermeable wall structure can be quantitatively measured.

  Further, according to the water leakage amount measuring method for another impermeable wall structure according to the present invention, after fixing the opening to one side surface of the impermeable wall structure, the water inside the container is drained, Since the inside of the container is brought into a predetermined atmospheric pressure state, a water head difference can be easily created between the inside of the container and the other side surface of the impermeable wall structure at the same depth as the container. Moreover, since the external water pressure becomes relatively larger than the inside of the container, the adhesion of the opening of the container to the side surface can be enhanced.

  Further, according to the water leakage amount measuring method of another impermeable wall structure according to the present invention, after the interior of the container is brought into a predetermined atmospheric pressure state, the impermeable wall structure that enters the interior of the container through the opening is used. Since the amount of leaked water is measured, a minute amount of leaked water from the impermeable wall structure can be quantitatively measured.

  Moreover, according to the water leakage amount measuring method for another impermeable wall structure according to the present invention, the inside of the container is brought into an atmospheric pressure state or an atmospheric pressure state below it, so that a desired water head difference can be created. If the pressure is smaller than the atmospheric pressure, it becomes possible to create a larger water head difference, and the leakage power from the water shielding wall structure increases and the amount of water leakage increases. By increasing the amount of water leakage, the measurement time of the amount of water leakage can be shortened.

  Further, according to the method for measuring the amount of water leakage of another impermeable wall structure according to the present invention, since the container is configured so that the water leaking into the container can be visually recognized from the outside, the water leakage situation inside the container is determined. It can be easily confirmed from the outside.

  Moreover, according to the water leakage amount measuring method for another impermeable wall structure according to the present invention, after temporarily fixing the opening of the container to one side surface of the impermeable wall structure, the water inside the container is drained. By sucking, the opening of the container is watertightly fixed to one side surface of the impermeable wall structure, and the inside of the container is brought into a predetermined atmospheric pressure state, so that the container can be easily fixed.

  Further, according to the method for measuring the amount of water leakage of another impermeable wall structure according to the present invention, one end is in communication with the inside of the container, and the other end is placed in the air. In a configuration having a drain hose that communicates with the inside of the container and the other end communicates with a water tank provided outside the container, and a vacuum pump connected to the water tank, the vacuum pump is operated. Water inside the container is sucked through the water storage tank and the drainage hose, and the opening of the container is watertightly fixed to one side surface of the water-impervious wall structure. Since a predetermined atmospheric pressure state is set, a small amount of water leakage from the impermeable wall structure can be quantitatively measured with a simple configuration.

  Moreover, according to the water leakage amount measuring method of another impermeable wall structure according to the present invention, the impermeable wall structure is a vertical impermeable wall constituted by a steel sheet pile or a steel pipe sheet pile connected via a joint. The opening of the container is arranged in a manner straddling the joint portion, and is shaped to be watertightly fixed to the steel sheet pile or steel pipe sheet pile including the joint portion. Even if there is no difference in water level between the inside and outside of the configured vertical impermeable wall, it is possible to quantitatively measure a slight amount of water leakage from the joint portion.

  Moreover, according to the water leakage amount measuring method of another water-impervious wall structure according to the present invention, the edge of the opening of the container is configured by an elastic body having a hardness that follows the water-impervious wall and does not deform. So, for example, when the opening is fixed in a watertight manner across the joint part, the rubber is deformed according to the shape of the joint part to improve the adhesion, and then the inside of the container is brought to a predetermined atmospheric pressure state. In addition, excessive deformation of the rubber can be suppressed.

  As described above, the water leakage amount measuring apparatus and the measuring method for the impermeable wall structure according to the present invention include a vertical water impermeable structure made of a steel sheet pile having a joint that requires high water shielding performance such as a waste sea surface disposal site. It is useful for measuring the amount of water leakage in the wall structure on site, and is particularly suitable for quantitatively measuring the amount of water leakage even if there is no difference in water level.

10 Vertical impermeable wall (impermeable wall structure)
DESCRIPTION OF SYMBOLS 10a Side surface 12 Joint 12a Upper end part 14 Steel sheet pile 16 Outer side 18 Inner part 20 Opening part 22 Container 22a Upper surface 22b Lower surface 24 Water sampling means 26 Pressure adjusting means 28 Rubber 30 Grasping part 32 Coupler 34 Inlet hose 36 Coupler 38 Drain hose DESCRIPTION OF SYMBOLS 40 Water tank 42 Vacuum pump 44 Portable generator 46 Arm 48 Magnet 50 Temporary fixing means 52 Caulking material 100 Water leakage measuring device of impermeable wall structure G Seabed ground WL Sea surface W Water leakage

Claims (17)

A device for measuring the amount of water leakage from a water-impervious wall structure for water-impervious standing in water,
A water sampling means comprising a container having an opening fixed in a watertight manner on one side surface of the impermeable wall structure;
A water leakage amount measurement of the impermeable wall structure, comprising: a pressure adjusting means for bringing the inside of the container of the water sampling means fixed to one side of the impermeable wall structure into a predetermined atmospheric pressure state. apparatus.   The pressure adjusting means drains water inside the container of the water sampling means that is watertightly fixed to one side surface of the water-impervious wall structure, thereby bringing the inside of the container into a predetermined atmospheric pressure state. The water leakage amount measuring device for the impermeable wall structure according to claim 1.   The water leakage amount measuring means for measuring the amount of water leakage from the water shielding wall structure that enters the inside of the container that has been brought into a predetermined atmospheric pressure state by the pressure adjusting means through the opening. Or the water leakage amount measuring device of the impermeable wall structure according to 2.   The said pressure adjustment means makes the inside of the said container the atmospheric pressure state or the atmospheric pressure state below it, The water leak amount measuring apparatus of the impermeable wall structure as described in any one of Claims 1-3 characterized by the above-mentioned.   The water leakage measuring device for a water shielding wall structure according to any one of claims 1 to 4, wherein the container is configured so that water leakage entering the container can be visually recognized from the outside.   The pressure adjusting means has one end communicating with the interior of the container and the other end disposed in the air, one end communicating with the interior of the container, and the other end disposed outside the container. The water-impervious wall structure according to any one of claims 1 to 5, comprising a drainage hose communicated with a water tank provided in the water tank and a vacuum pump connected to the water tank. Water leakage measuring device. The impermeable wall structure is a vertical impermeable wall constituted by a steel sheet pile or a steel pipe sheet pile connected via a joint,
The said opening part of the said container is arrange | positioned in the aspect over the part of the said joint, It is a shape which can be watertightly fixed to the said steel sheet pile or a steel pipe sheet pile including the part of the said joint. 6. The water leakage amount measuring device of the water shielding wall structure according to any one of 6.   8. The impermeable wall according to claim 1, wherein an edge of the opening of the container is made of an elastic body that follows the impermeable wall and has a hardness that does not deform. Structure leakage measuring device. It is a method for measuring the amount of water leakage from a water-impervious wall structure for water-impervious standing in water,
A water-impervious wall structure characterized in that the inside of the container is brought into a predetermined atmospheric pressure state after fixing the opening of the water sampling means comprising a container having an opening on one side surface of the water-impervious wall structure. Water leakage measurement method.   The said inside of the said container is drained after fixing the said opening part to one side surface of the said water-impervious wall structure, The inside of the said container is made into a predetermined | prescribed atmospheric pressure state, The Claim 9 characterized by the above-mentioned. A method for measuring the amount of water leakage in the impermeable wall structure.   The water shielding amount according to claim 9 or 10, wherein the amount of water leakage from the water shielding wall structure entering the inside of the container through the opening is measured after the inside of the container is set to a predetermined atmospheric pressure state. Wall leakage measurement method.   The method for measuring a leakage amount of a water shielding wall structure according to any one of claims 9 to 11, wherein the interior of the container is brought to an atmospheric pressure state or an atmospheric pressure state lower than the atmospheric pressure.   The water leakage amount measuring method for a water shielding wall structure according to any one of claims 9 to 12, wherein the container is configured such that water leakage entering the inside of the container is visible from the outside.   After temporarily fixing the opening of the container to one side surface of the impermeable wall structure, the water inside the container is sucked and the opening of the container is placed on one side surface of the impermeable wall structure. The method for measuring the amount of water leakage of the impermeable wall structure according to any one of claims 9 to 13, wherein the container is fixed in a watertight manner and the inside of the container is brought into a predetermined atmospheric pressure state.   One end is in communication with the inside of the container, the other end is placed in the air, and one end is in communication with the inside of the container, and the other end is in a water storage tank provided outside the container. In a configuration having a drainage hose in communication and a vacuum pump connected to the water storage tank, the vacuum pump is operated to suck water inside the container through the water storage tank and the water draining hose. The opening of the container is fixed to one side surface of the water-impervious wall structure in a watertight manner, and the inside of the container is brought into a predetermined atmospheric pressure state. The water leakage amount measuring method of the impermeable wall structure as described in 2. The impermeable wall structure is a vertical impermeable wall constituted by a steel sheet pile or a steel pipe sheet pile connected via a joint,
The said opening part of the said container is arrange | positioned in the aspect over the part of the said joint, It is a shape which can be watertightly fixed to the said steel sheet pile or a steel pipe sheet pile including the part of the said joint. The method for measuring the amount of water leakage of the impermeable wall structure according to any one of 15.   The water-impervious wall according to any one of claims 9 to 16, wherein an edge of the opening of the container is made of an elastic body having a hardness that follows the water-impervious wall and does not deform. How to measure the amount of water leakage in the structure.

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