JP4399846B2 - Impermeable wall structure - Google Patents

Description

  The present invention relates to a water shielding wall structure that is installed mainly in the ground around a management-type waste final disposal site or on the inner side surface of a revetment structure and used to block inflow and outflow of water inside and outside.

  In general, landfill disposal is a stable waste final disposal site where landfill disposal of stable waste that does not leak harmful substances is performed at the final waste disposal site, and hazardous waste containing harmful substances is completely blocked. There is a closed-type waste final disposal site, and a managed-type waste final disposal site for landfilling managed-type waste that is waste other than the stable type or harmful type.

  Conventionally, when constructing the above-mentioned managed-type waste final disposal site, a waste input space is formed by surrounding with a revetment structure or excavating the ground, and the waste is thrown into the space for reclamation. I have to.

The impermeable revetment for forming this waste input space needs to make the inflow and outflow of water into and out of the inside extremely small, so that the gap formed in the earth retaining wall made of H-type steel sheet piles is impermeable. A water-impervious wall having a water-impervious wall structure formed by filling a material is used so as to obtain high water-impervious performance (see Patent Document 1).

  As shown in FIG. 11, the impermeable revetment 1 is constructed so as to surround a desired space supported by a water bottom such as a coast, and the inside partitioned as a waste input space. The management type waste A is thrown into landfill.

  The impermeable revetment 1 has a sheet pile type retaining wall 2 using a steel pipe sheet pile on the outer side (open ocean side), and has a water shielding wall 3 using an H-type steel sheet pile on the inner side (landfill space side). Filled sand 4 is filled between the type earth retaining wall 2 and the inner impermeable wall 3, and a tie material 5 is stretched between the upper ends of both walls 2 and 3. In addition, the code | symbol 4a in a figure is a monitoring well.

  As shown in FIG. 12, the inner impermeable wall 3 is filled with a impermeable material having deformation followability in the void 16 formed in the retaining wall constituting the impermeable wall 3 installed in the soil. It is comprised by providing the water shielding material layer 17 formed in this way, and a high water shielding effect is obtained.

  The earth retaining wall is formed by continuously connecting H-shaped steel sheet piles 8, 8 ... having a cross-sectional shape with plate-shaped flanges 7 and 7 integrated on both edges of the plate-shaped web 6 in the horizontal direction. Nine underground impermeable layers 10 are formed.

  Each H-shaped steel sheet pile 8 has a female joint portion 11 having a C-shaped cross section at the edge of each flange 7, 7, and a male joint portion 12 having a bulging portion at the tip so as to be fitted and retained therein. Are integrally provided, and between the adjacent H-shaped steel sheet piles 8, 8, the joints 13 are meshed with each other and continuous in the lateral direction.

  Moreover, although not shown in figure in this coupling 13, an inflatable water stop material is made to adhere, and it water-stops by absorbing and expanding after this driving.

  In this way, by placing the H-shaped steel sheet piles 8, 8... Continuously in the horizontal direction, the flanges 7 and 7 constitute a pair of side wall bodies 14 and 15 arranged in parallel to each other. The web 6 serves as an inter-wall connecting member that connects the side wall bodies 14 and 15.

That is, between the adjacent H-shaped steel sheet piles 8, 8, the inner space 16 having a substantially rectangular shape surrounded by the webs 6, 6 and the flanges 7, 7, that is, the side wall bodies 14, 15 by both flanges 7, 7, and By forming a water shielding material layer 17 by filling a space 16 in the earth retaining wall surrounded by the connecting member between the walls by the web 6 with a water shielding material having deformation followability, the water shielding wall 3 is formed. Is configured.
JP 2003-113608 A

  However, in the conventional technology as described above, since the surface portion of the water shielding material layer is exposed to the air, the water shielding material filled in the voids in the both retaining walls contains predetermined moisture. If the inside of the water shielding material layer is dried due to evaporation of moisture, etc., the deformation following property will be lost and water will be generated due to cracks, etc., and the water shielding performance will deteriorate. There was a problem that there was a possibility.

  In view of the above-described problems of the prior art, an object of the present invention is to provide a water-blocking wall structure in which a water-blocking material layer always contains the necessary predetermined moisture and can maintain high water-blocking performance.

In order to solve the above-described conventional problems and achieve the intended purpose, the invention according to claim 1 is a shield that has a deformation following property in a void formed in a retaining wall installed in the soil. In the impermeable wall structure comprising the impermeable layer formed by filling the water material,
The water-insulating material of the water-insulating material layer uses a soil-based water-insulating material mainly composed of viscous soil that exhibits high deformation followability by containing a certain amount of water, and the moisture in the water-insulating material layer is reduced. The upper end surface of the water-insulating material layer is closed by a water-insulating material layer in the water-insulating material layer for maintaining the water-insulating material layer, and the water-insulating material layer in the water-insulating material layer is configured by connecting the side wall members in the horizontal direction. The side wall body has an upper wall as an outer wall and a water storage portion whose inside is in contact with the upper end surface of the water shielding material layer. The water storage portion is configured to contain drying prevention water, and the water storage portion It is closed by a coping covering the upper end of the wall, and the coping is provided with a through hole communicating with the inside of the water storage section.

  The invention according to claim 2 is the construction of claim 1, and the earth retaining wall includes a pair of side walls formed by connecting the side wall members in the horizontal direction, and a wall between the side walls. And a connecting material, and a water shielding material is filled in a void in the retaining wall surrounded by the both side walls and the connecting material between the walls.

  In addition to the structure of claim 1, the earth retaining wall straddles the side wall member formed by connecting the side wall members in the horizontal direction and the connecting portion of the adjacent side wall members. A sheet-like or plate-like cover member bridged between the side wall members, and a water-impervious material is filled in a gap in the earth retaining wall surrounded by the side wall body and the cover member. To do.

  The impermeable wall structure according to the present invention includes a impermeable material layer formed by filling a void formed in a retaining wall installed in the soil with a impermeable material having deformation followability. As a result, a water shielding material filling space having a relatively large cross-section is formed in the vertical direction, and the filling of the water shielding material to a large depth is ensured, resulting in a highly reliable water shielding structure. Since the water shielding material having deformation followability is used, the water shielding is maintained even when the sheet pile is deformed, and a high water shielding effect is obtained.

  Further, the water shielding material layer has a predetermined moisture content by closing the upper end surface of the water shielding material layer by means of the moisture maintenance material in the water shielding material layer that is layered to maintain the moisture in the water shielding material layer. The contained state is maintained, and high water shielding performance can be maintained.

  By using the sheet-like material for a part or all of the side wall body, the side wall body is lower in cost and more economical than using a sheet pile, a steel plate, or a precast concrete plate.

  The water-insulating material layer moisture maintaining means includes a water storage portion whose inside is in contact with the upper end surface of the water-shielding material layer, and includes water for preventing drying in the water storage portion, so that the water-shielding material layer preferably has a predetermined moisture content. Can be maintained in a state containing water, and high water shielding performance can be maintained.

  The water storage part can be easily provided without adding new parts to the conventional water-impervious wall structure by using the upper ends of both side walls as outer walls.

  The coping that covers the upper end of the impervious wall is equipped with a through hole that communicates with the interior of the reservoir. It becomes possible to supply.

  By closing the through hole with porous concrete, rainwater or the like can permeate from the porous concrete and obtain water for drying prevention in the water storage portion even when the upper end portion of the water shielding wall is closed.

  By providing a water pipe that is connected to the side wall on the open ocean side and that prevents water from drying out from the open ocean into the reservoir, it can be supplied appropriately to the reservoir without using power such as a pump. can do.

  Provided with a water supply pipe passed through each water storage part isolated by the wall-to-wall connecting material, and a communication hole for communicating the interior of each water storage part isolated by the wall-to-wall connecting material with the wall-to-wall connecting material By providing the upper end of the connecting member between walls or lower than the upper end of the side wall body, it is possible to collectively manage the water for preventing drying of each water storage part, and keep each part in a constant state. Can do.

  Made of polymer material, oily material or asphalt material, etc., and equipped with an evaporation prevention layer that covers the surface of drying prevention water, it suppresses the decrease due to evaporation of drying prevention water and always provides high water shielding performance in the long term. It can be demonstrated.

  The moisture maintenance means in the water shielding material layer is made of a polymer-based material, an oily material, an asphalt material, or the like, and is composed of an evaporation preventing layer that covers the upper end surface of the water shielding material layer. Evaporation can be suitably prevented, and high water shielding performance can be maintained.

  Next, the water shielding wall structure according to the present invention will be described. In addition, the same code | symbol is attached | subjected to the part same as the above-mentioned Example, and description is abbreviate | omitted.

  As in the conventional example shown in FIG. 11, the impermeable wall 3 is supported on the water bottom surface of a coast or the like and is disposed on the inner side (landfill space side) of the impermeable wall structure constructed so as to surround the periphery of the desired space. Filled sand is filled between the impermeable wall 3 and the sheet pile retaining wall 2 using an outer (open ocean side) steel pipe sheet pile or the like, and between the upper ends of both walls. Thai material is stretched to form a water-impervious revetment structure.

  This impermeable wall 3 is formed by filling a void formed in the earth retaining wall constituting the impermeable wall 3 installed in the soil with a impermeable material having deformation followability. It is comprised by providing, and the high water-blocking effect is acquired.

  The earth retaining wall is formed by continuously connecting H-shaped steel sheet piles 8, 8 ... having a cross-sectional shape with plate-shaped flanges 7 and 7 integrated on both edges of the plate-shaped web 6 in the horizontal direction. Nine underground impermeable layers 10 are formed.

  Each H-shaped steel sheet pile 8 is integrally formed with a female joint portion 11 having a C-shaped cross section at the edge of each flange 7 and a male joint portion 12 having a bulging portion at the tip so as to be fitted to this and prevented from coming off. The joint 13 is integrally provided, and the joints 13 and 13 are meshed with each other between the H-shaped steel sheet piles 8 and 8 adjacent to each other so as to be continuous in the lateral direction.

  Moreover, although not shown in figure in this coupling 13, the inflatable water stop material is made to adhere, and this stops water by absorbing and expanding after driving.

  In this way, by placing the H-shaped steel sheet piles 8, 8... Continuously in the horizontal direction, the flanges 7 and 7 constitute a pair of side wall bodies 14 and 15 arranged in parallel to each other. The web 6 serves as an inter-wall connecting member that connects the side wall bodies 14 and 15.

  That is, between the adjacent H-shaped steel sheet piles 8, 8, the inner space 16 having a substantially rectangular shape surrounded by the webs 6, 6 and the flanges 7, 7, that is, the side wall bodies 14, 15 by both flanges 7, 7, and By forming a water shielding material layer 17 by filling a space 16 in the earth retaining wall surrounded by the connecting member between the walls by the web 6 with a water shielding material having deformation followability, the water shielding wall 3 is formed. Is configured.

  In addition, the water shielding material uses a soil-based water shielding material mainly composed of viscous soil, and exhibits high deformation followability by containing a certain amount of moisture.

  The water shielding material layer 17 is filled with a water shielding material from a lower end of the H-shaped steel sheet pile 8 to a predetermined height higher than the control water level WL below the upper end armature from a predetermined height position in the bottom bottom ground 9. It is formed by filling the material up to a position where a desired space is left at the upper end of the impermeable wall 3.

  In the lower end portion of the H-shaped steel sheet pile 8, a water shielding material is poured into the impermeable layer 10 deeper than the current water bottom.

  Further, the upper end surface of the water shielding material layer 17 is closed by a water-insulating material layer in-layer moisture maintaining means for maintaining moisture in the water shielding material layer 17.

The moisture maintaining means in the water shielding material layer is surrounded by the webs 6, 6 and the flanges 7, 7. The webs 6, 6 and the flanges 7, 7 serve as outer walls, and the interior is above the water shielding material layer 17. A water storage unit 21 in contact with the end face is provided, and the drying prevention water 22 is accommodated in the water storage unit 21.

  Thus, by providing the water prevention part 22 in the water storage part 21, the water-impervious material layer 17 always maintains the moisture content in the water-impervious material layer 17 within a certain range, and exhibits high deformation followability. It is kept in a state where it can.

  Therefore, the impermeable wall 3 can suppress the deterioration of the impermeable performance over time and can maintain the predetermined impermeable performance.

  The upper end portion of the impermeable wall 3 is covered with a concrete coping 23.

  In this concrete coping 23, a through hole 24 that also serves as a management hole communicating with the water storage unit 21 is formed on the upper surface thereof, and when the dry prevention water 22 in the water storage unit 21 is insufficient. The water can be supplied from the through hole 24.

  As shown in FIG. 2, the opening of the through hole 24 may be closed with porous porous concrete 25. At this time, the porous concrete 25 is permeated with water to allow the water to pass through the through holes 24 and to supply water to the water reservoir 21.

  In the above-described embodiment, the earth retaining wall is configured using the H-shaped steel sheet piles 8, 8... And the water shielding wall 3 is formed by filling the gap in the earth retaining wall with the water shielding material. In addition to this, the earth retaining wall is constituted by other steel sheet piles such as U-shaped steel sheet piles, straight sheet piles or steel pipe sheet piles, and combinations thereof, and a water-insulating material is filled in the gap formed in the earth retaining wall. Thus, a water shielding wall may be configured.

  FIG. 3 shows an embodiment of a water shielding wall structure formed by filling a gap formed inside a retaining wall using a U-shaped steel sheet pile with a water shielding material.

  In this example, one side wall body 14 of the retaining wall constituting the impermeable wall 3 is formed by making the U-shaped steel sheet piles 30, 30. is doing. The U-shaped steel sheet pile 30 has male and female joints 31 and 32 on both edges, and the zigzag side wall body 14 is formed by fitting them together.

  More preferably, an inflatable water-stopping material is attached to the gap in the male-female joint, and the water is stopped by absorbing water after being driven in and expanding.

  The other side wall 15 of the retaining wall constituting the water-impervious wall 3 is composed of retaining plates 33, 33... Made of flat-cast precast concrete plates or steel plates.

  A pair of inter-wall connecting members 34 made of I-shaped steel provided integrally with the U-shaped steel sheet pile are provided on the back surface of one side wall 14 at regular intervals, and a pair of back-to-back arrangements are provided on both edges of the tip. Plate-like material fitting grooves 35, 35 are provided in an upright direction. The other side wall body 15 of the retaining wall is formed by fitting both ends of the retaining plate 33 into the plate-like material fitting grooves 35 and 35 and installing a large number of them vertically.

  The space formed between the side wall bodies 14 and 15 thus configured is filled with a water shielding material having the same deformation followability as described above to form a water shielding material layer 36, and the inside is a water shielding wall. A water storage part in contact with the water-impervious material layer 36 is formed at the upper end part, and drying prevention water is provided in the water storage part.

  FIG. 4 shows an example of a water shielding wall structure formed by filling a gap formed inside the earth retaining wall using the steel pipe sheet pile 40 with a water shielding material.

  The earth retaining wall is bridged between the two steel pipe sheet piles 40, 40 across the connecting portion of the side wall body 14 formed by connecting the steel pipe sheet piles 40, 40 in the horizontal direction and the adjacent steel pipe sheet piles 40, 40. And a plate-like cover member 43 such as a sheet or a steel plate covering the connecting portion of both steel pipe sheet piles 40, 40, and the water shielding wall is a space formed in the earth retaining wall, that is, a side wall It is configured by filling the space surrounded by the body 14 and the cover member 43 with a water shielding material to form the water shielding material layer 20.

  And this water-impervious wall structure forms the water storage part 21 in which the inside contact | connects the upper end surface of the water-impervious material layer 20 in the upper part of a water-impervious wall, and is provided with the water 22 for drying prevention in each water storage part 21. It has become.

  The steel pipe sheet pile 40 has male and female joints 41 and 42 formed at symmetrical positions around each other, and is connected to each other by fitting them together. In addition, it is more preferable that the air gap in the female joint 42 is filled with a water shielding material so as to have a certain degree of water impermeability.

  Moreover, between the both ends of each wall body connection material 34, such as H-shaped steel, the fitting groove | channels 35 and 35 are formed, and the sheet tension plate shape formed by extending | stretching a sheet-like material on the steel frame. The both side wall bodies 14 and 15 may be configured by fitting materials.

  Thus, the structure using the sheet-like material is more effective when the revetment structure is piled up from the bottom, and is lower in cost than the case of using a sheet pile, a steel plate and a concrete precast plate, and is highly economical. .

  In addition, in each Example, the same code | symbol is attached | subjected to the same part and duplication description is abbreviate | omitted.

  Moreover, although the above-mentioned Example demonstrated the example in which each water storage part was isolated by each wall body connection material, as shown in FIG. 5, in this water-impervious wall structure, each wall body connection material 6 ( 33), the water supply pipes 50 passed through the water storage units 21 and 21 isolated by 33) may be provided, and the drying prevention water 22 may be supplied to the water storage units 21 through the water supply pipes 50 in a lump.

  The water supply pipe 50 communicates with water supply means (not shown) installed outside the impermeable wall, and is supplied with water arbitrarily or continuously. The water supplied from the water passage hole 51 formed at a position corresponding to the water reservoirs 21, 21... Is discharged to the water reservoir 21.

  Moreover, in this water-impervious wall structure, as shown in FIG. 6, each water storage part 21 and 21 is formed by forming the upper end of the connection member 6 (33) between walls lower than the side wall bodies 14 and 15 of a retaining wall. As shown in FIG. 7, each water storage part 21, by forming a communication hole 52 that connects the water storage parts adjacent to the inter-wall connecting member 6 (33), as shown in FIG. 7. 21 may be communicated.

  If the water storage units 21, 21... Are communicated in this way, for example, as shown in FIG. 7, the water inlet 53 is provided at a position lower than the water level of the open ocean side wall body 14 and If a water pipe 54 communicating with the open ocean is connected to the water inlet 53 and seawater is supplied from the open sea as the drying prevention water 22 through the water pipe 54 and the water inlet 53, a plurality of water storage portions 21 can be supplied by water supply from one place. , 21 ... can be distributed. Note that a check valve (not shown) is interposed in the water pipe 54 to prevent water from flowing back from the water reservoir to the open ocean side.

  As shown in FIGS. 8 and 9, an evaporation preventing layer 60 made of a polymer material, an oily material, an asphalt material or the like may be provided so as to cover the water surface of the drying preventing water 22. By providing the evaporation preventing layer 60 in this way, a decrease due to evaporation of the drying prevention water 22 can be suppressed, and high water shielding performance can always be maintained in the long term.

  The evaporation preventing layer 60 may be fixed to the upper end of the water storage unit 21, and may be floated on the drying preventing water 22 when the evaporation preventing layer is made of a material lighter than water.

  Moreover, in the above-mentioned embodiment, the moisture maintaining material layer moisture maintaining means has been described as having a water storage part. However, as shown in FIG. 10, the moisture shielding material layer moisture maintaining means includes a polymer material, It may be composed only of the evaporation preventing layer 60 made of an oily material or an asphalt material. In addition, the same code | symbol is attached | subjected to the part same as the above-mentioned Example, and description is abbreviate | omitted.

  Thus, by directly covering the upper end surface of the water shielding material layer 60 with the evaporation preventing layer 60, evaporation of moisture contained in the water shielding material layer 17 can be suppressed, and high water shielding performance can be maintained for a long time. It is like that.

  The impermeable wall structure according to the present invention can be applied not only to the management-type waste final disposal site constructed facing the open ocean but also to constructing the disposal site on land. In addition, a water-impervious wall may be installed as a retaining wall for embankments, etc. that forms the inner surface of the waste input space. When a depression is used as a disposal site, the surrounding ground is excavated. Then, a groove may be formed, and a water shielding wall may be constructed as a continuous underground wall in the groove.

It is a partial fracture perspective view showing an example of the impermeable wall structure concerning the present invention. It is a longitudinal cross-sectional view which shows another example same as the above. It is sectional drawing which shows another example same as the above. It is a partially broken perspective view which shows another example same as the above. (A) is a top view which shows further another Example of the impermeable wall structure concerning this invention, (b) is the longitudinal cross-sectional view. (A) is a top view which shows another Example same as the above, (b) is the longitudinal cross-sectional view. (A) is a top view which shows another Example same as the above, (b) is the longitudinal cross-sectional view. It is a perspective view which shows the further another Example of the impermeable wall structure concerning this invention. It is a perspective view which shows other Example same as the above. It is a perspective view which shows the further another Example of the impermeable wall structure concerning this invention. It is sectional drawing which shows the example implemented to the revetment structure of a management-type waste final disposal site. It is sectional drawing which shows an example of the impermeable wall structure in FIG.

A Managed waste WL Managed water level 1 Impervious revetment 2 Sheet pile retaining wall 3 Impermeable wall 4 Filled sand 4a Monitoring well 5 Thai material 6 Web 7 Flange 8 H-type steel sheet pile 9 Submarine ground 10 Impervious layer 11 Female joint Part 12 Male joint part 13 Joints 14 and 15 Side wall body 16 Gap 17 Water shielding material layer 20 Water shielding material layer 21 Water storage part 22 Drying prevention water 23 Coping (Kasaishi)
24 Through-hole 25 Porous concrete 30 U-shaped steel sheet pile 31 Male joint 32 Female joint 33 Earth retaining plate 34 Inter-wall connecting material 35 Plate-like material fitting groove 36 Water shielding material layer 40 Steel pipe sheet pile 41 Male joint 42 Female joint 43 Cover member 50 Water supply pipe 51 Water flow hole 52 Communication hole 53 Water flow hole 54 Water flow pipe 60 Evaporation prevention layer

Claims (3)

In the impermeable wall structure comprising the impermeable layer formed by filling the void formed in the earth retaining wall installed in the soil with the impermeable material having deformation followability,
The water-insulating material of the water-insulating material layer uses a soil-based water-insulating material mainly composed of viscous soil that exhibits high deformation followability by containing a certain amount of moisture,
By means of moisture maintaining means in the water shielding material layer that is layered to maintain moisture in the water shielding material layer, the upper end surface of the water shielding material layer is closed,
The water-insulating material layer moisture maintaining means includes a water storage portion having an outer wall as the upper end portion of the side wall body configured by connecting the side wall members in the horizontal direction, and an inner portion in contact with the upper end surface of the water shielding material layer, Containing water for preventing drying in the water reservoir,
The water storage section is closed by a coping that covers an upper end of a water shielding wall, and the coping has a through hole that communicates with the inside of the water storage section .   The earth retaining wall includes a pair of side wall bodies configured by connecting side wall members in the horizontal direction, and an inter-wall body connecting material for connecting the both side wall bodies. The water shielding wall structure according to claim 1, wherein a water shielding material is filled in a space in the enclosed retaining wall.   The earth retaining wall is a sheet-like or plate-like cover that spans between the side wall members formed by connecting the side wall members in the horizontal direction and the connecting portions of the side wall members adjacent to each other. 2. The water shielding wall structure according to claim 1, further comprising: a member, wherein a water shielding material is filled in a space in the earth retaining wall surrounded by the side wall body and the cover member.