JP3832348B2 - Impermeable structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a water-impervious structure constructed underwater or in the ground. For example, in a facility that handles waste such as a waste disposal site, a harmful substance is contained in the ground for some reason. It is constructed as a continuous wall to prevent this from flowing out and diffusing from the site along with the flow of water.
[0002]
[Prior art]
  Generally, as a structure built in the ground with a name such as underground continuous wall, for example, a structure in which an underground continuous wall of RC structure is constructed, a soil cement is continuously formed, and steel materials such as H-section steel are formed therein. Inserts, steel sheet piles connected to form a steel wall body, steel panels for underground wall construction to build steel sheet piles such as H-shaped or box-shaped (hereinafter referred to as "steel panels") Panel)), the H-shaped or box-shaped closed space filled with solidified material such as mortar or concrete to improve the bending rigidity of the wall, and steel pipe sheet piles are connected and driven A wall structure is known.
[0003]
  These structures are originally handled as retaining walls and underground continuous walls that prevent the surrounding ground from collapsing when excavating the ground, and ensure the strength and rigidity of how it is used. Therefore, from the aspect of water shielding, it was sufficient in the sense that it would not hinder the construction.
[0004]
  In recent years, it has become clear that waste contains substances that are harmful to living things and the human body.InAs a result, structures that take account of water-imperviousness have been sequentially developed for existing waste disposal sites and waste disposal sites compared to conventional structures.
[0005]
  Specifically, a steel pipe sheet pile joint that is driven into the ground as a continuous wall is filled with a solidifying material such as mortar or asphalt for water shielding, a steel sheet pile joint is coated with a swelling material, the above A steel panel filled with soil cement solidified water shielding material or asphalt solidified water shielding material, and angle members and channel steel are attached to the joints of steel sheet piles. It is what is filled.
[0006]
  FIG. 4 shows an example of construction of a water-impervious structure at a waste landfill site. In the figure, reference numeral 9 is a caisson embankment constructed as a revetment on the coast, underwater, etc. It is constructed on the foundation rubble 10
[0007]
  Reference numeral 11 denotes a water-impervious structure constructed on the inland side of the caisson embankment 9 at a position away from the caisson embankment 9, and the water-impervious structure 11 penetrates the improved ground 12 previously formed, The water-permeable layer 13 is continuously constructed, and the tip thereof is embedded in the water-impermeable layer 13 to a predetermined depth.
[0008]
  Further, reference numerals 14 and 15 are respectively a covering stone and a consolidation block laid in order to prevent erosion of the sea floor of the front part of the caisson dam 9, and 16 is filled between the caisson dam 9 and the impermeable structure 11. A backfill stone, 17 is a sabo sheet laid on the backfill stone 16, and 18 is a rubble filled on the inland side (inner side) of the water shielding structure 11.
[0009]
  Moreover, FIGS. 5-8 shows the steel sheet pile wall used for the water-impervious structure 11 mentioned above, and shows the outline one by one.
[0010]
  FIG. 5 shows a steel pipe sheet pile wall constructed by filling mortar or the like (not shown) in the joint portion a between the steel pipe sheet piles 19 driven into the ground as a wall body, and FIG. 6 shows the wall body. Is a steel sheet pile wall obtained by applying an expansion material (not shown) to the joint part A between U-shaped steel sheet piles 20 that are driven into the ground as shown in FIG. This is a combined steel sheet pile wall in which a steel plate 22 is welded to form a plane substantially H-shaped combined steel sheet pile and mortar 23 is filled in the closed region a.
[0011]
  Further, as shown in FIGS. 8 (a) and 8 (b), for example, an L-shape is formed in the vicinity of the joint portion A between the U-shaped steel sheet piles 20 and 20 each having a normal target joint 20a at both ends. There is a U-shaped steel sheet pile wall in which a steel material 24 is welded and a mortar or the like 23 is filled in the space.
[0012]
[Problems to be solved by the invention]
  In the conventional water-blocking structure, etc., the water-blocking method for applying the swellable water-blocking material used for the joint is recognized by laboratory tests and simulated field experiments at shallow depth, but the depth is deep. The reliability of the water shielding when the water shielding structural member is long is considered to change depending on the reliability of the application of the water shielding material at the joint and the construction status.
[0013]
  Furthermore, a water shielding method for filling the joints of steel pipe sheet piles with solidification materials such as mortar and asphalt has also been proposed, but as described above, the certainty of water shielding at a deep depth is related to the construction status. It is determined.
[0014]
  From the point of view of whether or not the vertical wall structure can be used for water treatment at the target waste disposal / disposal site, the underground wall structure that satisfies the strength and rigidity shown in the prior art has a concrete structure in the case of the RC continuous wall structure. It is difficult to prevent the water permeability of the part from becoming large depending on the management situation at the crack and the joint surface, and the water shielding is uncertain depending on the construction situation of the joint part in the steel sheet pile continuous wall, for example H-shaped steel sheet pile etc. Even if concrete or mortar is filled inside a steel pipe sheet pile joint, the parts that are difficult to block water are localized due to such shrinkage, cracking due to bending deformation of the wall, and the occurrence of a joint surface during construction. It is hard to escape.
[0015]
  Even in recent water-blocking methods, water-blocking due to reduced reliability of the application of swellable water-blocking material applied to steel sheet pile joints as the depth increases and the temperature rise associated with steel sheet pile placement In addition to degradation of the performance of the material itself, when using asphalt material that has been softened by heating as a water barrier, asphalt solidifies during construction due to cooling by the surrounding ground and water as the construction depth increases. There is a possibility that a region of reduced water shielding performance is formed at a deeper position.
[0016]
  In other words, in any of the above cases, there is a possibility that the water shielding performance is lowered somewhere, and so-called “mizumichi” may occur. In that case, the ground and the filled water shielding material are regarded as uniform. The analysis result that obtains an average solution differs from the actual phenomenon, and the outflow from the local “Mizumichi” increases, so the action of harmful substances in the vicinity becomes an environmental issue. For this reason, development and application of a water shielding material that improves the reliability of the water shielding structure and establishment of an inspection method for this kind of phenomenon are desired.
[0017]
  In addition, depending on the hazardous substances in the waste to be treated and disposed of, there may be harmful substances that permeate the organic water shielding material (for example, water shielding sheet). is there.
[0018]
  The present invention has been made to solve the above-described problems. In a waste disposal site or the like, a harmful substance that can flow out together with groundwater can be reliably blocked by conventional common sense construction management. The purpose is to provide a water structure.
[0019]
[Means for solving the problems]
  The water-impervious structure according to claim 1 is formed by joining joints of hat-shaped steel members provided with arms parallel to the web and asymmetrical joints at both ends of a U-shaped steel member having flanges at both ends of the web. A continuous water barrier structure in which the continuous walls are formed in double, each continuous wall is formed so that the webs overlap each other, and a flexible water barrier material is filled in the double walls.In addition, a baffle plate that separates the joint portion between the outside and the inside is disposed in the double wall.It is characterized by.
[0020]
  Main departureMing enables a water-impervious structure that depends on the water permeability of the water-impervious material by filling the inner wall of the double-walled structure formed by the hat-shaped steel material as described above with a soft water-impervious material. AhRu.
[0021]
  As the steel material in this case, for example, a straight sheet pile having joints at both ends or a U-shaped steel material having a flange at both ends of the web can be used.
[0022]
  Further, the soft water-proof material may be any material that can follow the structural deformation of the double wall. For example, a soil-based material such as clay containing bentonite or kaolin, or asphalt is finely granulated and emulsified. In addition to emulsified asphalt kneaded with the material, a water-impervious material that does not produce “water” near room temperature can also be used.
[0023]
  In particularMain departureIn the case of the light, the continuous wall is formed by the hat-shaped steel material having the asymmetric joint as described above, and the continuous wall is formed by the double-shaped hat-shaped steel material so that both webs overlap each other. Since the required amount of flexible water-blocking material is filled only in the joints that can be used, the amount of water-blocking material can be greatly reduced compared to a structure in which a double wall is filled with water-blocking material. Can do.
[0024]
  At present, the most reliable water shielding material in natural ground is a thick clay soil, so-called viscous soil layer. On the other hand, as a concrete value for ensuring water shielding performance, the layer thickness Is 50cm or more and the permeability is 1 × 10^-6cm / sec or less is shown. In addition, in order to treat asphalt as a water shielding material, the thickness is 5 cm or more and the water permeability is 1 × 10.^-7cm / sec or less is observed.
[0025]
  Also,Main departureMing forms a closed space (closed region) by various combinations of steel sheet piles, steel sheet piles and steel, steel pipe sheet piles and piles and steel materials, and as a flexible water shielding material in this closed space, for example bentonite, kaolin, etc. It is filled with soil-based clay such as clay, or emulsified asphalt that is kneaded with emulsified material after asphalt is finely granulated, and the soft water shielding material does not leak from the closed space. Provide water structure.
[0026]
  That is, if a closed space formed of steel is filled with a soft water-impervious material and the water-impervious material does not leak out of the closed space, the presence of a horizontal cohesive soil layer in the ground that can normally be impermeable is present. A vertical cohesive soil layer corresponding to the above or an asphalt water-impervious layer having a thickness equivalent to 5 cm or more is formed.
[0027]
  More specifically, filling the closed space of H-shaped steel sheet piles and box-type steel sheet piles, which have already been proposed as steel sheet piles or steel panels for building underground wall bodies, with a flexible water shielding material. However, when there is a steel sheet pile joint part in the part of the closed space formed at this time, it is adopted as a conventional water shielding method so that the soil-based water shielding material does not leak from the joint part. It is advisable to take measures such as applying the swellable water shielding material applied to the joint portion of the steel sheet pile. Here, the role of the flexible water shielding material is that even if the water shielding structure is deformed for some reason, it follows the deformation and does not form a “waterway”.
[0028]
  Moreover, about the required depth of the flexible water-insulating material used here, the permeability coefficient k is 1 × 10 in the target ground.^-6If there is a viscous soil layer with a thickness of 50 cm or less at a cm / sec or less, the depth should be deeper than the lower end of the viscous soil layer. It is deeper than the bottom of the lever.
[0029]
  In addition, the upper surface of the soft water shielding material is constructed so that it has a head above the groundwater surface of the target waste treatment ground, and the weight of the flexible water shielding material filled in the closed space of the steel sheet pile is used to treat the ground. It prevents the outflow of groundwater inside.
[0030]
  Furthermore, the required thickness of the flexible water shielding material depends on the combination of the steel sheet pile and the steel material, the apparent water permeability coefficient of the water shielding structure to which the swelling water shielding material is applied, and the water permeability coefficient of the flexible water permeable material, When a soft water shielding material is used as a combination steel material, the necessary width of the water shielding material (thickness in the horizontal direction) is ensured by appropriately changing the installation width of the steel material according to the water permeability coefficient of the water shielding material.
[0031]
  In the present invention, by inserting a baffle plate together with the water shielding material in the soft water shielding material filling portion, the length of the streamline from the joint portion to the joint portion can be extended, and the water permeability coefficient can be adjusted.
  The baffle plate referred to here is not particularly specified in terms of shape or material as long as it can change the streamline in the soil-based water shielding material such as a steel plate or wood.
[0032]
  The water-impervious structure according to claim 2 is formed by connecting hat-shaped steel joints provided with arm portions parallel to the web and asymmetrical joints at both ends of a U-shaped steel section having flanges at both ends of the web. Each continuous wall is formed so as to have a gap between the hat-shaped steel materials, and the double wall is filled with a flexible water shielding material.In addition, a baffle plate that separates the joint portion between the outside and the inside is disposed in the double wall.It is characterized by.
[0033]
  Since the continuous wall is formed so as to have a certain gap between the webs of the hat-shaped steel materials, as a result, not only the joint portion but also the entire continuous wall is filled with soft water shielding. Even in this case, since the continuous wall is formed by the hat-shaped steel material having the asymmetric joint as described above, the structure in which the double wall made of the normal steel sheet pile material having the symmetric joint is filled with the water shielding material. In comparison, the filling amount of the water shielding material can be greatly reduced.Furthermore, by inserting a baffle plate, the length of the stream line from the joint part to the joint part can be extended, and the hydraulic conductivity can be adjusted.
[0034]
  The water shielding structure according to claim 3 is:A plurality of steel pipes arranged side by side at a predetermined interval and a steel material arranged on both sides with respect to the parallel direction of the steel pipes. Provided on both sides with respect to the parallel direction of at least some of the steel pipes and joints provided at both ends of the steel materialA joint is coupled, and a closed region formed by the steel material and the steel pipe is filled with a soft water-proof material.
[0035]
  Steel pipes are lined up inside the double water-proof structureTherefore, the amount of the water shielding material corresponding to the amount inside the steel pipe can be reduced. That is, the amount of the water shielding material can be reduced while maintaining the cross-sectional performance and the water shielding performance.
[0036]
  Moreover, although it is easier to drive steel pipes connected, it is not always necessary to connect them. Moreover, the steel pipe to connect does not need to be adjacent. The shape of the steel pipe may be appropriately determined such as a round shape or a square shape.
[0037]
  The water-blocking structure according to claim 4 is characterized in that3In the described water-impervious structure, a baffle plate that separates the outer and inner joint portions is arranged in the double wall.
[0038]
  In the case of the water-impervious structure according to the third aspect, the baffle plate only needs to be disposed within the double wall in order to connect the steel pipe and the steel pipe to form a closed space.
[0039]
  The water-blocking structure according to claim 5 is the claim1, 2 or 4The described water-blocking structure is characterized in that a cavity is formed on one side separated by a baffle plate, and this cavity is used as an observation well in the water-blocking structure. In addition to detecting leaks due to water defects, it is possible to quantitatively grasp the effect of the water-blocking structure by analyzing the components of the permeated water collected in the observation well.
[0040]
  The water-impervious structure according to claim 6 is the water-impervious structure according to claim 5, wherein the hollow portion is a hollow tube inserted therein, and the hollow portion for the observation well is By forming a hollow tube in the tube, it is possible to form an observation well of a necessary scale very easily and reliably.
[0041]
DETAILED DESCRIPTION OF THE INVENTION
  1 (a) and 1 (b) show the present invention.ApplyAn example of a water-impervious structure, and in the figure, a plurality of combination steel materials 1A made up of two hat-shaped steel materials 1 (hereinafter referred to as "shape steels with asymmetrical joints") are driven into the ground to connect each adjacent combination The steel materials 1A are coupled to each other, and a soft water-proof material 2 is filled in a closed region a formed between the adjacent combined steel materials 1A and 1A.
[0042]
  Each combination steel material 1A is formed by joining two asymmetric joint-equipped steels 1 and 1 back to back, and each asymmetric joint-equipped steel 1 is a U-shaped steel material 1c having a flange 1b and 1b at both ends of a web 1a. The arm 1d projecting from both ends in parallel with the web 1a, and the left-right asymmetric joint 1e projecting from the tip of the arm 1d. The two shaped steels 1 with asymmetric joints are arranged back to back, and are integrally joined by welding both webs 1a, 1a.
[0043]
  The plurality of combined steel materials 1A formed in this way are connected and driven into the ground, and are connected to each other by fitting the joints 1e of the adjacent shaped steels 1 with asymmetric joints to each other. A swelling material (not shown) is applied to the joint portion between the joints 1e located on the side.
[0044]
  Moreover, the soft water-proof material 2 is filled in the closed region a formed between the adjacent combined steel materials 1A and 1A, and thus the plurality of shaped steels 1 with asymmetric joints are arranged in a double manner, and the combined steel material 1A , 1A, a double wall water shielding structure is constructed in which a flexible water shielding material 2 is filled in the joint portion.
[0045]
  In this case, the soft water-insulating material 2 may be any material that can follow the structural deformation. For example, a soil-based material such as clay containing bentonite or kaolin, or asphalt is finely granulated and kneaded with the emulsifying material. Things like emulsified asphalt can be used. Note that the above soil-based soft water shielding material may be used instead of the emulsifying material.
[0046]
  At the time of construction, first, a plurality of combined steel materials 1A are connected and driven, and the joints 1e of the adjacent hat-shaped steel materials 1 and 1 are fitted to each other so that a plurality of asymmetric joint-attached shape steels are arranged. Build a double wall consisting of one.
[0047]
  Next, after each closed region a between the combined steel materials 1A and 1A is washed to a predetermined depth, the soft water shielding material 2 is filled in each closed region a.
[0048]
  Before the combined steel sheet pile 1A is driven into the ground, a swelling material is applied in advance to at least the joint 1e located on the disposal site side, and at that time, the swelling applied to the joint 1e located on the disposal site side When the material becomes resistance when the combined steel material 1A is driven and it becomes difficult to drive the combined steel material 1A, a similar swelling material is applied to the joint 1e located on the opposite side.
[0049]
  Moreover, since the flexible water-impervious material 2 filled in each closed region a has a large permeability coefficient, when the apparent permeability coefficient of the double wall is slightly large, from the shaped steel with asymmetric joint 1 having a large cross-sectional dimension. By taking measures such as using the combined steel material 1A, the water permeability coefficient of the double wall can be reduced.
[0050]
  In this case, for example, by using the combined steel material 1A made of the shape steel 1 with an asymmetric joint having a large cross-sectional dimension, the volume of each closed region a is increased and the filling thickness of the flexible water shielding material 2 is increased. The water permeability can be reduced.
[0051]
  FIG. 1 (c)An embodiment of the invention according to claim 1 of the present application is shown.What to do when the apparent permeability coefficient of the double wall is slightly large due to the small cross-sectional size of the combined steel material 1A or the large permeability coefficient of the flexible water shielding material 2AndThe water shielding material 2 is filled in the closed region a between the combined steel materials 1A and 1A, and the baffle plate 3 is inserted.
[0052]
  By being comprised in this way, since the water permeation distance (distance between the joint parts located in the both sides of the baffle plate 3) of the flexible water shielding material 2 becomes long, the apparent water permeation coefficient of a double wall becomes small. With the above configuration, a required water permeability can be satisfied in any case. What is necessary is just to determine the installation position and magnitude | size of this baffle board suitably.
[0053]
  In addition, without connecting the two asymmetrical joint-equipped structural steels 1A arranged back to back in each combination steel material 1A, the structural steels 1 with asymmetrical joints can be individually placed. Unlike the case of the combined steel 1A in which the joints 1e are simultaneously fitted and driven, the shaped steel 1 with an asymmetric joint can be easily driven by the conventional sheet pile driving method, so that the construction efficiency is greatly improved. Moreover, it is not necessary to apply a swelling material to the joint.
[0054]
  2 (a) and 2 (b) show the present applicationAccording to claim 2 ofinventionApplyImpermeable structureExampleA plurality of shaped steels 1 with asymmetric joints are connected and driven on both sides of the conductive material 4 arranged horizontally in the figure, and the adjacent shaped steels 1 with asymmetrical joints are connected to each other between the joints 1e. The double wall which consists of the shape steel 1 with a plurality of asymmetrical joints by interposing the conducting material 4 between them is formed. And the flexible water-insulating material 2 is filled between the double walls.By disposing a baffle plate that further separates the outer and inner joint portions in the double wall, the water shielding structure according to claim 2 is obtained.
[0055]
  In this case, the conductive material 4 serves as a ruler (guide) for keeping the interval w between the shape steels 1 and 1 with asymmetric joints constant when the shape steel 1 with asymmetric joints is driven. Yes, the arrangement of this conductive material 4 allows the shaped steel 1 with asymmetric joint to be driven vertically while maintaining a predetermined interval w, so that the filling thickness of the flexible water shielding material 2 is maintained as designed. And can ensure high water-stopping properties.
[0056]
  In addition, steel materials, such as H-shaped steel and a channel steel, are used for the conducting material 4 in this case, and the space | interval corresponding to the water-permeability coefficient of the flexible water-insulating material 2 can be hold | maintained between double walls.widthThe conductive material 4 is used.
[0057]
  At the time of construction, the conductive material 4 is first arranged horizontally. Next, a continuous wall is formed by driving a plurality of shaped steels 1 with asymmetric joints into one side of the conductor 4 and fitting the joints 1e of the adjacent shaped steels 1 and 1 with asymmetrical joints together.
[0058]
  Next, similarly, a plurality of shaped steels 1 with asymmetric joints are also driven on the opposite side of the conducting material 4, thus constructing double walls made of the shaped steels 1 with a plurality of asymmetrical joints on both sides of the conducting material 4, respectively. And after wash | cleaning between double walls to the predetermined depth, the soft water-proof material 2 is filled in it.
[0059]
  3 (a) to 3 (g) are the same in this application.According to claim 3 ofImpermeable structureEmbodimentIn the example of FIG. 3A, a plurality of steel pipes 5 with joints are driven into the ground at predetermined intervals. Further, on both sides between adjacent steel pipes 5 and 5 with joints, a water shielding steel plate 6 formed in a planar arc shape as a water shielding steel material is respectively disposed.
[0060]
  Each of the water-impervious steel plates 6 and the steel pipe 5 with a joint includes an L-shaped joint 6 a projecting from both ends of the water-impervious steel sheet 6 and a T-shaped joint 5 a with a lip projecting from the side surface of the steel pipe 5 with a joint. They are joined together by mating.
[0061]
  And the water shielding material 2 is filled in the closed area | region a which consists of the steel pipes 5 and 5 with a joint, and the water shielding steel plate 6. FIG. In this case, the T-shaped joint 5 a with lip and the L-shaped joint 6 a are formed continuously in the vertical direction of the steel pipe 5 with joint and the water-impervious steel plate 6.
[0062]
  In the example of FIG. 3 (b), I-shaped joints 5b with lips project from the side surfaces of the steel pipes 5 with joints instead of the T-shaped joints with lips. ).
[0063]
  In the example of FIG. 3 (c), a plurality of steel pipes with joints 5 are driven into the ground at predetermined intervals, and a steel pipe (or pile) 7 is provided between adjacent steel pipes 5 and 5 with joints. Has been driven in.
[0064]
  Further, on both sides between the steel pipes 5 and 5 with joints, a water shielding steel plate 6 formed in a planar arc shape as a water shielding steel material is respectively disposed. Each of the water-impervious steel plates 6 and each of the steel pipes 5 with a joint includes an L-shaped joint 6 a projecting from both ends of the water-impervious steel sheet 6, and a T-shaped joint 5 a with a lip projecting from the side surface of the steel pipe 5 with a joint. Are connected by fitting them together.
[0065]
  And the water shielding material 2 is filled in the closed area | region a which consists of the steel pipes 5 and 5 with a joint, and the water shielding steel plate 6. FIG. In this case, the T-shaped joint 5 a with lip and the L-shaped joint 6 a are formed continuously in the vertical direction of the steel pipe 5 with joint and the water-impervious steel plate 6.
[0066]
  In the example of FIG. 3 (d), an I-shaped joint 5b with a lip projects from the side surface of the steel pipe 5 with a joint instead of the T-shaped joint with a lip, and the other configuration is shown in FIG. 3 (c). It is the same as the example shown in.
[0067]
【The invention's effect】
  According to the present invention, harmful substances that can flow out with groundwater even when the construction and management of individual works depend on weather and sea conditions, such as when the waste disposal site is a landfill site, The conventional construction management can be almost completely blocked by the water shielding structure and the viscous soil layer in the seabed ground or the constructed water shielding layer on the sea bottom.
[0068]
  In particular, according to the water-impervious structure according to claim 1, the continuous wall is formed by the asymmetrical joint-equipped steel having the asymmetrical joint as described above, and the continuous wall is double-arranged. However, since the two webs are formed so that they overlap each other and only a joint portion that can be used as a water supply is filled with a necessary amount of a flexible water shielding material, a normal double sheet made of a normal steel sheet pile material having a symmetric joint. Compared to a structure in which a wall is filled with a water shielding material, the amount of the water shielding material can be greatly reduced.
[0069]
  Furthermore, according to the water-impervious structure according to claim 1, the baffle plate separating the outer and inner joint portions is disposed in the double wall, thereby reducing the length of the streamline from the joint portion to the joint portion. It has the effect that it can be extended and the hydraulic conductivity can be adjusted.
[0070]
  According to the water-impervious structure according to claim 2, the continuous wall is formed so as to have a certain gap between the webs of the asymmetric joint-shaped steels. The continuous wall is filled with soft water shielding, so that the water shielding can be further ensured. In this case as well, the shape steel with an asymmetric joint having the asymmetric joint as described above is used. Since the continuous wall is formed, the filling amount of the water shielding material can be greatly reduced as compared with the structure in which the water shielding material is filled in the double wall made of a normal steel sheet pile material.
[0071]
  Further, in the case of the water-impervious structure according to claim 2, the baffle plate that separates the outer and inner joint portions is disposed in the double wall, thereby extending the length of the streamline from the joint portion to the joint portion. It has an effect that the water permeability coefficient can be adjusted.
[0072]
  The water shielding structure according to claim 3 is:A double wall formed by steel with joints at both ends is located inside itBy being combined with a plurality of steel pipes, it is possible to reduce the amount of the water shielding material corresponding to the amount inside the steel pipe. That is, the amount of the water shielding material can be reduced while maintaining the cross-sectional performance and the water shielding performance.
[0073]
  According to the water-impervious structure according to the fourth aspect, the length of the streamline extending from the joint part to the joint part can be extended by disposing the baffle plate separating the joint part between the outer side and the inner side in the double wall. Therefore, the water permeability coefficient can be adjusted.
[0074]
  According to the water-impervious structure according to claim 5, since the hollow portion is formed on one side separated by the baffle plate, the water-stopping structure is used by utilizing the hollow portion as an observation well in the water-impervious structure. In addition to being able to detect leaks due to defects, it has the effect of being able to quantitatively grasp the effect of the water shielding structure by analyzing the components of the permeated water collected in the observation well.
[0075]
  According to the water-impervious structure according to claim 6, the observation well for the necessary scale can be formed very simply and reliably by forming the hollow portion for the observation well by inserting a hollow tube into the water-impervious structure. It has the effect of being able to.
[Brief description of the drawings]
FIG. 1 shows an example of a water-impervious structure using a combination steel material and a flexible water-impervious material, wherein (a) and (c) are sectional views thereof, and (b) is a sectional view of the combination steel material.
FIGS. 2A and 2B show other examples of a water shielding structure including a shape steel with an asymmetric joint, a conductive material, and a flexible water shielding material. FIG. 2A is a cross-sectional view thereof, and FIG. It is.
FIG. 3 shows an example of a water shielding structure using a steel pipe with a joint, a water shielding steel plate, and a flexible water shielding material, (a), (b), (c), (d) are sectional views thereof, (e) (F) is a cross-sectional view of a steel pipe with a joint, and (g) is a cross-sectional view of a water-impervious steel plate.
FIG. 4 is a longitudinal sectional view showing an example of a water shielding structure for a waste landfill disposal site.
FIG. 5 is a cross-sectional view showing an example of a water shielding structure using a steel pipe sheet pile.
FIG. 6 is a cross-sectional view showing an example of a water shielding structure using a steel sheet pile.
FIG. 7 is a cross-sectional view showing an example of a water shielding structure using a combination sheet pile.
8A is a cross-sectional view showing an example of a water-impervious structure using a water-impervious steel sheet pile, and FIG. 8B is a cross-sectional view of the water-impervious steel sheet pile.
[Explanation of symbols]
  1 Shaped steel with asymmetrical joint (hat-shaped steel)
  1A combination steel
  2 Soft water barrier
  1a Web
  1b Flange
  1c U-shaped steel with cross section
  1d arm
  1e Fitting
  2 Soft water barrier
  3 baffle plate
  4 materials
  5 Steel pipe with joint
  5a T joint with lip
  5b I-shaped joint with lip
  6 Impermeable steel plate (steel)
  6a L-shaped fitting
  7 Steel pipe (or pile)

Claims (6)

The continuous wall formed by joining the joints of the hat-shaped steel material provided with the arm part parallel to the web and the asymmetrical left and right joints was formed at both ends of the U-shaped steel material having flanges at both ends of the web. Each of the continuous walls is formed so that the webs overlap each other, and the double wall is filled with a flexible water shielding material , and the outer wall and the inner joint portion are further filled in the double wall. A water shielding structure characterized in that a baffle plate separating the two is arranged . The continuous wall formed by joining the joints of the hat-shaped steel material provided with the arm part parallel to the web and the asymmetrical left and right joints was formed at both ends of the U-shaped steel material having flanges at both ends of the web. Each of the continuous walls is formed so as to have a gap between the hat-shaped steel materials, and the double wall is filled with a soft water-proof material , and the double wall is further provided with an outer side. A water shielding structure comprising a baffle plate separating inner joint portions . A plurality of steel pipes arranged side by side at a predetermined interval and a steel material arranged on both sides with respect to the parallel direction of the steel pipes. A joint provided on both ends of the steel material and a joint provided on both sides of the steel pipe in the parallel direction of at least some of the steel pipes are coupled to each other, and a flexible shield is formed in a closed region formed by the steel material and the steel pipe. A water shielding structure characterized by being filled with a water material. The water shielding structure according to claim 3 , wherein a baffle plate that further separates an outer joint portion and an inner joint portion of the double wall is disposed in a closed region formed by the steel material and the steel pipe . The water shielding structure according to claim 1, 2, or 4 , wherein a hollow portion is formed on one side separated by a baffle plate.   6. The water shielding structure according to claim 5, wherein the hollow portion is a hollow tube inserted therein.

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