JP2007144272A - Additional construction method of water impervious layer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a wall with increased reliability by constructing a height increasing part on a water impervious wall to a bulkhead body constructed by placing concrete on caisson when height must be increased after constructing the partitioning bulkhead of a waste landfill disposal site. <P>SOLUTION: For a water impervious wall 15 constructed along the bulkhead body by caisson, an upper concrete wall 31 is additionally constructed at the upper part of the sheet pile wall 20 as the height increasing part with necessary height h. On the sea side wall of the wall 31, an asphalt mixture wall 32 is integrally provided, a controlling pipe 37 is erected inside the concrete wall to monitor the status at each water sealing part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention comprises a seawater disposal body for standing a caisson or the like, and a water-impervious wall provided at a predetermined interval on the inside, for disposal of industrial waste and general waste as landfill for sea-surface disposal. Constructed in combination to build a managed revetment separated from the open sea. An object of the present invention is to provide means for easily recovering the function as a water barrier when a defect occurs in the water barrier of the levee body. In addition, when it is necessary to raise the levee body, a raised portion to be built on the upper part of the levee body can be easily constructed, and a highly reliable impermeable wall raising method for a partition revetment is provided. be able to.

  In order to dump industrial waste and general waste at a disposal site constructed by dividing the sea surface, when constructing a sea surface disposal site, a partition revetment that divides the planned landfill is constructed, It is constructed as a closed landfill site. It is known that the partition revetment is composed of steel (pipe) sheet pile type revetment, caisson type revetment, rubble type revetment, etc. It is necessary to provide a watertight partition so that the retained water does not leach into the open sea. Therefore, in addition to applying water-impervious treatment to the main body of the revetment or separately installed water-impervious walls, water-impervious treatment is also applied to the seabed in the area where the disposal site is constructed as necessary. There is a need to do.

  In order to construct the revetment that has been subjected to the water-impervious treatment, conventionally, in addition to the construction method of placing a water-impervious sheet on the reclaimed land side of the revetment, mainly steel pipe sheet piles and steel sheet piles of any other cross-sectional shape, etc. The water impervious wall is constructed by placing or embedding the steel sheet piles in a row. When constructing a water shielding wall by erecting the steel pipe sheet pile or the like, a joint member provided on a side portion of the sheet pile is connected in combination, and a water shielding material is provided in the internal space of the combined part of the joint member. By being filled with water, it is constructed so that the water shielding can be maintained well.

When constructing the water-impervious wall with a steel sheet pile standing upright, the steel sheet pile is set up in a hole excavated by an excavator such as an earth auger, or the steel sheet pile is driven by vibration or impact. A conventional method of placing a steel sheet pile can be used. And, it is constructed as a series of water-impervious walls without any gaps by combining the joint members between the sheet piles erected adjacent to each other, and in the part where the joint members are combined, the asphalt is formed in the space portion. A mixture, mortar, or other filler capable of exhibiting water shielding performance is filled to achieve water shielding between the steel pipe sheet piles constituting the water shielding wall (for example, see Patent Document 1). .
JP 2004-204581 A

  In the conventional management-type revetment of the above-mentioned conventional example, a water-impervious wall constructed by standing up sheet piles at predetermined intervals on the revetment main body with caisons lined up and the side (inner side) on which the waste is accumulated. And the disposal site is partitioned. In addition, in the management-type revetment that constructs a water-impervious wall in the state of being divided into two stages, sand is filled between the two-stage impermeable walls and the sand layer is used for management. Wells are arranged at predetermined intervals. And when the defect arises in the water-imperviousness in the water-impervious walls on both the inner and outer sides, means are provided so that it can be easily known. Therefore, there is a demand for development of means that can easily confirm the location of the failure when the water impermeability at the water impervious wall is problematic, and prevent repair.

  In addition to providing means for detecting defects in the impermeable wall, it may be planned to increase the amount of waste in the middle of using the disposal site partitioned by the management-type revetment. . For example, design changes have been made to dramatically increase the amount of waste that can be accommodated by making it possible to stack waste higher, raising the revetment to be higher and higher so that the objective can be achieved. There are things to do. In response to such design changes, concrete caisson builds a formwork of a predetermined height on the already built caisson, casts concrete, and integrates it with the existing concrete wall. It is considered that it can be easily handled by raising the height.

  On the other hand, with respect to the impermeable wall constructed by arranging sheet piles, even if an additional impermeable wall was constructed on the upper part while maintaining the impermeable nature, it was added 2 There are many doubts about the reliability of the watertightness at the connection of different types of impermeable walls. In other words, when connecting another steel sheet pile over an existing steel sheet pile to construct an integrated sheet pile wall, the old and new impermeable walls are connected so that there is no gap at the connection. Building a club is a difficult technique. In addition, even if the upper and lower steel sheet piles are connected well and used as a water shielding wall, if any impact is applied to the wall body or nearby landfill, It is unavoidable that the phenomenon of water leaking from the connecting portion of the water is likely to occur, resulting in a serious defect that raises doubts about the reliability of the impermeable wall. In addition, even when a concrete wall is constructed on the upper part of the water-impervious wall, and the raised water-impervious wall is constructed, the concrete wall has a property that it is prone to cracking, and the water-impervious property between the inside and outside of the compartment is prevented. There is a problem that it is difficult to maintain well.

  In the present invention, when a defect occurs in a dam body that divides a waste landfill disposal site, a recovery process can be easily performed, and when a partition revetment needs to be raised, the impermeable wall can be easily raised. For the purpose of providing a construction method that can easily build a raised portion that can improve the reliability of water shielding and can always observe the state of the seal at the connection portion of sheet piles. Yes.

The present invention constructs a levee body in an arbitrary sea area, divides a waste disposal site, and disposes the levee body at a predetermined interval with respect to the revetment body constructed on the sea side and the revetment body. It relates to a management-type revetment that is formed by combining a water-impervious wall placed on the site side.
In order to prevent water leakage at the upper part of the sheet pile wall of the impermeable wall,
A water shielding layer is constructed along the concrete wall provided at the upper part of the sheet pile wall, and is integrated with the wall, and the water shielding layer is integrated with the lower sheet pile wall.

The invention of claim 2 is that when there is an obstacle to the water shielding performance at the connection between the sheet pile wall and the concrete wall in the concrete wall above the sheet pile wall,
The sheet pile wall is exposed to a predetermined height, a water shielding layer is constructed so as to cover the concrete wall from the exposed portion of the sheet pile wall, and the water shielding layer is integrated with the water shielding wall and buried. Returning, and integrating the water shielding layer with a sheet pile wall.

  According to a third aspect of the present invention, the water shielding layer constructed integrally with the sheet pile wall is constructed by building a layer of asphalt mixture with a predetermined thickness, or by sticking a sheet having water shielding properties to the wall. It is characterized by being.

The invention of claim 4 is a waste disposal site that constructs and partitions a bank body in an arbitrary sea area,
Each of the revetment main body and the impermeable wall, or by raising the upper part of one of them to an arbitrary height, as a means for increasing the waste storage volume in the waste disposal site deposition site,
The raised portion of the revetment main body is provided by building a concrete layer on the main body,
In the raised portion of the impermeable wall, the upper portion of the impermeable wall is included at a predetermined height, and is constructed as an additional concrete wall with a predetermined thickness,
The water-impervious wall and the raised portion of the water-impervious wall are subjected to a water-impervious treatment, and a water-impervious layer is constructed so as to partition the deposition site with respect to surrounding portions.

  In the partition revetment, when raising only the revetment main body and improving the accommodation capacity in the sedimentation place, it is constructed by adding a raised portion of the main body, and the additionally constructed levee body By performing a water shielding treatment on the raised portion of the main body, it is characterized by partitioning so that water that touches the waste on the deposition site side does not flow outside.

According to the sixth aspect of the present invention, in the partition revetment, in order to raise only the revetment main body, a caisson is built on the levee body main body, or a concrete wall is added on the dam body main body. Etc., using a means for constructing the raised portion of the levee body,
Water is applied to the raised part of the levee body constructed in addition to the raised part of the levee body, and water that touches the waste on the deposition site flows out to the outside. It is characterized by partitioning so as not to occur.

The invention of claim 7 is to construct a concrete wall having an arbitrary width and height so that the raised portion of the additionally constructed impermeable wall includes a predetermined height above the existing impermeable wall. ,
It is characterized in that a water-impervious layer is constructed in which both the concrete wall to be constructed additionally and the existing impermeable wall are subjected to a treatment for imparting water-imperviousness.

In the invention according to claim 8, the additionally formed water barrier layer is provided on the raised portion of the additionally formed water barrier wall so that an asphalt mixture layer is erected along the water barrier layer. Further, a water shielding treatment is performed so that water does not flow between the layer of the asphalt mixture and the existing water shielding layer.
According to a ninth aspect of the present invention, the water shielding layer provided along the water shielding wall includes a water shielding sheet disposed at an upper portion and an asphalt mixture layer constructed at a lower portion so as to be integrated with the water shielding wall. It is configured to act as an aqueous layer.

The invention according to claim 10 is characterized in that the raised portion of the impermeable wall is provided with a management pipe connected to the joint portion of the impermeable wall in an additionally constructed concrete wall, The pipe is provided with the same filler as that of the joint.
The invention according to claim 11 is a sheet pile wall constructed with a predetermined interval with respect to the revetment main body of the levee body, connecting the sheet piles erected in the row shape with a joint portion,
The interior space of the joint is filled with a water shielding material to maintain water shielding,
The pipe for management provided to stand in the additional concrete wall is filled with the same material as the water shielding material,
Using the means for observing the level of the water shielding material accommodated in the management pipe, it is possible to confirm the state of the water shielding walls inside the upper raised portion and the base.

The invention of claim 12 is a management-type revetment constructed by raising only the impermeable wall without raising the revetment main body of the levee body,
The raised water-impervious wall is constructed with a water-impervious layer that partitions the sedimentation site and the open sea side, and a water-impervious layer is also provided on the ground surface between the revetment main body and the raised impermeable wall. To do.

In the invention of claim 13, the sheet pile wall that constitutes the water-impervious wall is constructed by standing upright sheet piles such as a steel sheet pile, a steel pipe sheet pile or a steel sheet pile in a row,
The internal space of the joint between the sheet piles is filled with a water-impervious material having fluidity,
Communicating the connection part of the impermeable wall filled with the impermeable material and the management pipe provided in the raised additional concrete wall, and observing the state of the impermeable material using the administrative pipe It is possible to make it possible.

In the invention of claim 14, when the impermeable wall is incapable of self-supporting, the impermeable wall in which the sheet piles are erected in a row by performing the impermeable treatment is provided with support / connecting means for the revetment main body. Use a standing layer, and provide a back layer between the revetment body and the impermeable wall,
A raised portion is constructed at a predetermined height on each of the water-impervious wall and the revetment main body, and the surface of the back layer is covered with a water-impervious layer.

  As mentioned above, when building a management-type revetment to partition the sea surface and using it as a waste disposal site, especially when a defect such as water leakage occurs from the impermeable wall as a sheet pile wall, It is possible to easily carry out a process of easily recovering the water shielding property of the water shielding wall. And, in the process of restoring the water-blocking performance for the water-blocking wall, by building a layer of asphalt mixture along the existing wall, the water contaminated by the waste leaks to the outside of the revetment Can be prevented. In addition, in the construction to restore the water barrier, the sheet-like water shielding member is laid along the wall, and the construction method is used by covering the surface of the existing wall integrally. It can be done easily.

  In addition, when a managed-type revetment is constructed to separate the sea surface and used as a waste disposal site, it becomes necessary to increase the capacity of waste, etc. Can be easily constructed. For the caisson of the revetment main body as the main revetment, it is possible to construct concrete up to an arbitrary height, and in the impermeable wall constructed in parallel with the main revetment, the steel pipe sheet pile etc. The upper raised portion can be easily constructed on the upper part of the water wall. Furthermore, the function of the management-type revetment can be effectively exhibited by performing the water shielding treatment on the main revetment that is raised.

  By constructing the raising work, it is possible to easily construct the upper construction to be added to the impermeable wall and maintain the function as the impermeable layer. And by constructing a water shielding layer along the raised portion of the impermeable wall, a water shielding layer connected to the impermeable wall by existing sheet piles etc. can be provided, and cracks etc. occurred in the concrete of the raised portion Even in this case, the water shielding property can be well maintained by the layer or sheet of the water shielding material arranged along the concrete wall, and the reliability of the management-type revetment is not impaired.

  In addition, for the raised portion of the impermeable wall constructed by standing the sheet piles, a management pipe connected to the connection portion of the sheet piles at the base is provided, and a common impermeable material is connected to the joint portion. It is possible to always observe the state of the water shielding wall by observing the state of the water shielding material in the pipe. Moreover, when raising the existing partition revetment, it is possible to construct a revetment added at an arbitrary height. By providing a concrete wall and an asphalt wall together, the reliability of the additional raised wall can be increased. Can be improved.

  The construction method of the present invention will be described according to the illustrated example. The example shown in FIG. 1 explains the structure of a management-type revetment 1 that is generally used. The management-type revetment 1 is constructed as a bank body that partitions a waste landfill site from the open sea. The submarine ground for constructing the management-type revetment 1 is described on the assumption that, for example, a permeable stratum 2 is deposited on the upper part with a predetermined thickness, and the lower ground is an impermeable stratum 3. Yes. In the illustrated example, in order to partition the sea side and the disposal site side of the revetment 1, caisson 11 are installed in a row as the sea side revetment main body 10, and a predetermined interval is provided on the disposal site side. A vertical impermeable wall 15 with standing sheet piles and the like is constructed to constitute the impermeable wall portion.

  When constructing the management-type revetment 1, the foundation mound 4 is constructed with a predetermined width and height on the seabed ground in the same manner as when constructing a revetment using a general caisson, The revetment main body 10 is constructed by arranging the caissons 11 in a line. Of course, in the revetment main body 10 in which the caisson 11 is installed and constructed, the ground below the foundation mound 4 is subjected to a treatment for strengthening the ground so that it can withstand the weight of the structure constructed at the top. After constructing an improvement work such as applying, a heavy object such as the caisson 11 is constructed to stand in a row. And it is implemented similarly to the construction method of the revetment of a conventional example to enable the structural member to be supported stably by the revetment constructed as mentioned above.

  In the management-type revetment 1, the caisson 11 is arranged in accordance with the construction method as described above, and the revetment main body 10 is constructed, and then the back-up layer is disposed on the disposal site side (the waste landfill side: the inside of the enclosure). 13 is formed by stacking high quality materials such as sand. Further, a vertical impermeable wall 15 is constructed so as to penetrate the water-permeable formation 2 so as to partition the backing layer 13 and to penetrate the water-impermeable formation 3 to a predetermined depth. It is also performed in the same manner as a conventionally known method to perform a process of blocking the sea from the open sea side. As will be described later, the construction method used for constructing the water shielding wall 15 is that the steel sheet pile is erected and constructed as a sheet pile wall, and also the seam shielding property for the seam portion of the steel sheet pile. Water shielding treatment is performed so that

  In the sheet pile wall, it is preferable that the water shielding wall is constructed by filling a portion of the joint of the sheet pile to be erected with a material having fluidity such as an asphalt mixture and having fluidity. The foundation mound and the portion of the formation 2 located below the foundation mound are subjected to a treatment that provides water shielding so that water does not flow. In addition, in the example of the management-type revetment 1 shown in FIG. 1, the sand as the back-up layer 13 is filled between the revetment main body 10 and the water-impervious wall. A monitoring pipe 14 is embedded in the backing layer 13 to a predetermined depth.

  And when the water level and the water quality in the lining layer 13 can be constantly monitored, and any one of the impermeable walls 10 and 15 inside and outside the management-type revetment 1 has a defect in water shielding, So that you can easily know that. In other words, when water leakage occurs in the revetment main body 10, the water collected from the management pipe 14 is mixed with a large amount of seawater from the outside sea, so that it can be easily determined. In addition, when a defect occurs in the inner impermeable wall, it is found that there is a large amount of sewage that oozes out from the waste, so that it is necessary to take immediate measures against the leakage.

  If it is determined that the water collected from the monitoring pipe contains contaminants, the water impermeability at the water impervious wall 15 of the sheet pile is defective. In view of this, it is considered that water leakage hardly occurs at the connection portion of the wall body of the sheet pile. In other words, the occurrence of water leakage at the sheet impervious wall of the sheet pile is caused by cracks in the upper concrete 16 constructed at the upper part of the sheet pile wall, or a gap is generated at the connection part of the sheet pile main body and the concrete. You may think that it is due to. Therefore, when a defect such as water leakage occurs in the concrete wall above the sheet pile wall 15, as shown in FIG. 2, it can be dealt with by performing an additional process for improving the water shielding property. Is possible.

The example shown in FIG. 2 describes a case where repair work is performed on the upper member 16 of the water-impervious wall. First, the rear part is exposed so that the upper part of the sheet pile wall of the water-impervious wall 15 is exposed. Excavate the buried layer 13 and the landfill side 7. And although the state of the exposed upper member 16 of the sheet pile wall is confirmed by visual observation, it can be considered as a cause of water leakage in the upper member.
* A gap is created at the connecting part of the concrete block when the upper part is constructed.
* Cracks occur in concrete and water flows through the concrete layer.
* A gap is created in the connection between the sheet pile wall and the concrete, and water oozes out of the gap.
The above causes are assumed.
The occurrence of such a defect in the upper member means that the period of use as a waste disposal site is long unless a physical external force is applied locally to the upper member. It is also conceivable that a change with time or natural deterioration is the cause.

  In the explanatory view of the repair method described in FIG. 2, when a crack is seen in the upper member 16 after the upper portion of the impermeable wall is exposed, the crack has a high fluidity such as an adhesive or asphalt. To prevent water leakage from the gap. Thereafter, the entire periphery of the upper member 16 and the surface of the sheet pile wall below the upper member 16 are covered with a water shielding material to form a coating layer 17, so that a water shielding treatment is additionally performed. When the coating layer is constructed using asphalt, an arbitrary plate or block-like support member 19, 19a is provided as a support frame, and the partitioned portion is filled with an asphalt mixture with a predetermined thickness. Thus, the water-impervious layer 18 can be formed. It is also possible to construct the water shielding layer 18 by the asphalt mixture by winding an existing asphalt mat around the upper member 16 and then bonding the lower end thereof to the upper portion of the sheet pile wall using an adhesive.

  In addition to the means for constructing the covering layer 17 by the asphalt mat, an arbitrary water shielding sheet may be used to additionally perform a water shielding treatment on the upper member. For example, in the case of using a resin sheet such as polyethylene or vinyl chloride, such as a water shielding sheet that has been conventionally used as a water shielding sheet, cracks generated in the concrete joints and concrete After covering, a water-shielding layer around which a sheet is wound is formed as the covering layer 17 in FIG. 2, and the sheet is bonded to the surface of the concrete and the sheet pile using an adhesive so as to be integrated. In addition, the range which covers the upper part of the sheet pile wall can be arbitrarily set, and after performing such additional water shielding treatment, the back layer 13 as a filling layer inside and outside the water shielding wall. , Etc., return to the original state and continue to use the waste disposal site.

  In FIG. 1 and the example of the management-type revetment described later, the high and low tide level (HWL) or (LWL) of the sea tide explains the tide level measured in the field. In the padding sand as the backing layer 13 between the control water level (CWL) on the landfill (disposal site) side and the double impermeable walls The residual water level (RWL) is set as shown. Then, if possible, the water level relationship is set so that the relationship of (CWL) <(RWL) is established, and (HWL) or (L If it can be set lower than (.W.L), the contaminated water inside the landfill can be prevented from flowing into the sea, but the water levels can be managed in the same manner as in the conventional example.

  According to the amount of disposal planned when the management type revetment 1 was planned, the height of the revetment main body 10 and the impermeable wall is set, respectively, while using the disposal site, It may be necessary to increase the amount deposited (capacity). The optimal response to such a requirement is to increase the revetment and increase the amount of waste piled up. By constructing the revetment components higher than the current level, it is disposed of at the disposal site. It may be possible to respond to newly generated demand by performing additional processing such as increasing the capacity for storing goods.

  When such a problem is raised, the revetment main body 10 places the revetment up to an arbitrary height by placing concrete on the existing caisson 11 as shown in phantom lines in FIG. It is possible to make the raised structure 10a. On the other hand, in the impermeable wall 15 in which steel sheet piles are arranged, the upper portion of the sheet pile is raised to a predetermined height as in the case of the additional wall 15a simply indicated by an imaginary line, and the impermeable wall It is also conceivable to construct at any height. However, in reality, even if a high impermeable wall is constructed by adding a new sheet pile to the upper part of the existing sheet pile, it is difficult to improve the reliability of the highly formed impermeable wall. Currently, there is a demand for the development of construction methods that can improve reliability.

In order to solve the problems as described above, it is necessary to increase the height of the section so that the height of the waste accumulated in the deposition area surrounded by the water-impervious wall can be increased. At the same time, by separating the accumulated waste from the surrounding environment, a means for holding the waste in contact with the waste at the deposition site so that it does not leak to the surroundings is provided. Is needed.
In order to divide the deposition site, the following means can be considered including raising the revetment main body and the impermeable wall.
a: Raise the revetment main body and add water-impervious treatment to the raised revetment main body.
b: Raising only the water-impervious wall, and additionally constructing a water-impervious treatment for the raised water-impervious wall.
c: Raise both the revetment main body and the water-impervious wall, and additionally install a water-impervious treatment on the necessary parts.

  Among the above means, it is possible to improve the capacity of the deposition site by selecting and constructing one means according to the environment of the waste disposal site or the required conditions. In addition, the construction method described below can be applied to the water-impervious construction described in FIGS. 1 and 2. For example, the concrete layer provided above the sheet pile wall has a low additional concrete layer. It is possible to respond by constructing a construction and adding a water shielding layer to the surface. In addition, for the existing upper concrete layer, only additional measures to prevent water leakage such as plugging cracks will be added, and a new water shielding layer will be constructed around the upper member and the connection between the sheet piles. It is also possible to easily cope with the repair work by using means such as those described later.

  First, at the beginning of the specific description of the embodiment of the present invention, a method for raising a management-type revetment will be described by taking as an example a case where a water shielding wall is configured using the steel pipe sheet pile. In the water-impervious wall constructed by arranging the steel sheet piles in the water-impervious wall constructed on the inner surface side of the levee body in the conventional management-type revetment, sheet piles having an arbitrary cross-sectional configuration are placed, By combining the connecting means provided between the respective sheet piles, a strong wall having water shielding properties is constructed. And in the said sheet pile wall, the process which exhibits water shielding between each sheet pile is given. For one structural example of the water-impervious wall described in FIG. 3, a high water-impervious wall is constructed by adding it to the upper part of the steel pipe sheet pile. In order to be able to demonstrate. An example of this will be described below with reference to FIGS.

  The impermeable wall 15 constructed using the steel pipe sheet pile is composed of a large-diameter steel pipe 20, 20a... These are configured in combination with a sub-connection portion as will be described later. The main connection portion 21 is a combination of connection pipes 22 provided on both side surfaces of each steel pipe and a T-shaped insertion member 23, and the connection pipe 22 has a vertical slit provided outside. The connecting portion can be easily formed by using a combination method in which the insertion member 23 of the adjacent steel pipe sheet pile is inserted through the slit.

  Further, the space inside the pipe 22 is filled with an arbitrary water shielding material so that the water shielding at the connecting portion can be maintained well, but only the water shielding treatment at one connecting portion. However, in many cases, sufficient water shielding cannot be obtained. Therefore, in this embodiment, the sub-connecting portions 25 are respectively constructed on the side portions of the portions provided so as to include the connecting portions of the steel pipes 20, 20a. Has been done. That is, in the sub-connecting portion 25, connecting pipes 26 and 26a having slits are respectively provided at predetermined positions on the side portions of the steel pipes 20, 20a. A connecting plate 27 is attached to 26 a to constitute a closing portion that is opposed to the connecting pipe 22. Further, at the both ends of the connection plate 27, the portion to be combined with the connection pipe 26 can be provided with any means. For example, as shown in the figure, the end is bent and processed. Inserting and holding the bent portion into the slit of the connection pipe is also a means that can be used as one method.

  When the connection plate 27 is attached, a bent portion provided at both ends of the plate member is inserted into the slit of the connection pipe, so that a water shielding material is provided between the main connection portion 21 and the sub connection portion 25. A large space that can be filled can be provided. The internal space of each of the pipe 22 of the main connection portion 21 and the pipes 26 and 26a of the sub connection portion 25 is provided with water shielding means as a mortar filling layer 28 into which mortar is injected. . In addition, in a large space surrounded by the main and sub-connecting portions, a water shielding material such as an asphalt mixture with improved fluidity is injected to form an asphalt filling portion 29, thereby preventing water shielding. It is configured as an improved connection.

  In the embodiment of the present application, the upper raised portion 30 is applied to the existing impermeable wall 15 configured as described above, as described as the raised portion 15a in the example shown in FIG. It is. In the upper raised portion 30, a concrete layer is constructed so as to include the previously constructed upper member 16 at the upper portion of the steel pipe of the impermeable wall 15, and the function as the raised impermeable wall can be exhibited. . When placing the concrete of the upper raised portion 31, the mold frame 35 is constructed in advance at the upper part of the impermeable wall and in accordance with the shape of the impermeable layer. The asphalt mixture layer is constructed along the concrete wall 31 so as to have a substantially L-shaped cross section.

  As the layer of the asphalt mixture for water shielding, a water shielding layer 33 constructed so as to cover the upper surface of the backfill layer 13 and a layer 32 of the asphalt mixture provided vertically along the mold 35. It consists of. As shown in FIG. 5, the water shielding layer 33 is constructed so as to fill a space between the surface of the water shielding wall 15 on the main body side and the layer 32 of the asphalt mixture. To prevent water from flowing between them. The construction of the water shielding layer means that, for example, a crack is generated in the concrete wall constructed on the upper part of the water shielding wall 15 so that sewage oozes out from the deposition site side or deposits from the back layer 13 side. Although it is not possible to identify the location of water leakage where water enters the field, it is intended to deal with possible adverse situations.

  In the water shielding layer 33 for constructing the asphalt mixture layer with a predetermined thickness, the asphalt mixture wall 32 and the pile member of the wall body are provided between the water shielding wall and the sub-connection portion 25 of the water shielding wall. In order to maintain the space between them, it is only necessary to be able to maintain the space between them by combining a hard block such as a concrete block in addition to the asphalt mixture layer. In addition, instead of constructing a layer of asphalt mixture, an arbitrary water-impervious sheet is laid in a portion where a pressing force does not act on the water-impervious layer 33 and only a water barrier is expected. Therefore, the function as a water shielding layer may be exhibited.

  In order to keep the lower part of the formwork 35 stable, a concrete block or the like is used as a holding block 36, and a block arranged in combination with the water-impervious layer 33 is first placed to stabilize the lower part of the formwork. It is good to let you support. In addition, at the position where the block provided in the lower part is in contact with the surface of the iron member of the existing impermeable wall, a treatment layer 34 coated with asphalt primer is provided on the surface of the iron member, and the existing steel impermeable wall is provided. On the other hand, when the base of the upper raised portion 30 is connected in a watertight manner, the water shielding effect is better exhibited. The height of the vertical wall 32 by the asphalt mixture is set in accordance with the newly designed waste stacking height H2, and is arbitrary with respect to the waste stacking height H1. Make it possible to cope with changing to height.

  The upper raised part 30 constructed on the upper part of the existing impermeable wall 15 is formed with a formwork so as to construct a wall having a predetermined thickness in accordance with the designed wall thickness, and casts concrete. It is constructed to raise the impermeable wall by a height h, and is constructed as the upper concrete layer 31. When the concrete wall 31 is constructed, a management pipe 37 is provided upright at the main / sub joint portion of the existing impermeable wall so as to correspond to the packed bed 29 filled with the asphalt mixture. The asphalt mixture similar to the packed bed 29 is filled into the pipe 37. By providing the observation means, it is possible to know that an unforeseen unexpected situation such as a change in the level of the asphalt mixture in the management pipe 37 has occurred. That is, the change in the level of the asphalt mixture indicates that the water-impervious treatment layer is not maintained in a good state, and the occurrence of an abnormal situation can be observed.

  In the impermeable wall arranged together with the revetment main body 10, a concrete upper raised portion 15 a is constructed at an arbitrary height with respect to the existing impermeable wall 15 erected with a steel pipe. Be able to deal with changes in the height of the waste stack. Also, a vertical wall made of an asphalt mixture is constructed so as to cover the height of waste piled up inside the disposal site corresponding to the upper raised portion 30 so that water does not flow inside and outside the disposal site. Can be partitioned. Further, in order to construct the asphalt mixture walls 32 and 33 on the sea side of the concrete wall 31, after constructing the concrete wall 31, means for constructing a layer of the asphalt mixture is taken, and a water shielding layer is formed. Means for additional construction later may be used.

  The tie rod 38 shown in the example shown in FIG. 4 is attached to an anchor that has one base portion embedded in the revetment main body 10 made of caisson and the upper concrete 31 and embedded in the respective end portions. The tie rods 38 can be arranged at arbitrary intervals according to need, and in particular, a hard rock bottom where the impermeable wall cannot be made independent or an auxiliary support to the impermeable wall. When it is considered that the reliability can be improved by providing additional means, the support method using the tie rod is applied, and the submarine ground is also a relatively soft formation. It becomes an effective means. The auxiliary means for supporting the water-impervious wall having a structure that cannot stand independently so as not to fall down can be connected to the revetment main body and supported, and any auxiliary means can be used. Is not particularly limited.

  Although it is desirable to construct the impermeable wall as a self-supporting type in order to maintain the reliability of the impermeable wall, it is independent because of the geology and stratum of the seabed that constitutes the ground. It can be difficult to build as a type. Moreover, depending on the material used for the water-impervious wall, it may not be possible to drive deeply into the ground. However, in the management-type revetment, since the revetment main body is constructed as a wide and stable self-supporting type with caisson or the like standing upright, the impermeable wall arranged along the revetment main body In the embodiment, auxiliary means such as a connection using the tie rod 38 is provided so that the property as a vertical water shielding wall can be maintained.

  In addition, as shown in FIG. 1, the backfill layer 13 is provided between the revetment main body and the water-impervious wall, and the portion of the water-impervious wall 15 raised by combining the connecting means by the tie rod 38. Both of them are dependent on the self-supporting nature of the revetment body and are kept standing. Therefore, as described above, even in the impermeable wall constructed in a place where it cannot stand by itself, the auxiliary means for holding the impermeable wall in a state where it is self-supported is used to act similarly to the self-standing impermeable wall. be able to. And in order to observe the state of the water shielding material in the said water-impervious wall, it arrange | positions combining the pipe for management etc., can improve the reliability of a water-impervious wall, and can construct | assemble as a wall. Further, the inside of the management pipe can be provided as a hollow so that water or the like can enter freely, and when filling the water shielding material and observing the level, any material can be used. Preferably, the observation reliability can be further improved by using an asphalt mixture with improved fluidity.

  In the example shown in FIG. 4, the upper concrete 31 constructed on the upper part of the impermeable wall is called coping concrete. However, in the embodiment of the present invention, the upper concrete or the upper member is simply used. It is called and explained. By the way, in the example shown in FIG. 2, although it arrange | positions so that the layer of an asphalt mixture may be followed with respect to the side surface of the upper concrete 31 at the sea side, it is also possible to use a water-impervious sheet. . Moreover, in the example demonstrated in FIG. 6, it arrange | positions in the state which affixes the water-impervious sheet 32a on the sea (bank body) side of the upper concrete 31 without a gap. And even if a crack etc. generate | occur | produce in concrete by providing in the state which affixes the said water-impervious sheet 32a on the surface of concrete, even if a crack etc. generate | occur | produce in concrete, a water-impervious sheet can maintain favorable. .

  As the water shielding sheet disposed so as to be in close contact with the surface of the concrete wall, any one having good handleability and workability such as a rubber sheet or a vinyl sheet conventionally used in a waste disposal site. Sheets can be used. In addition, when trying to adhere the water shielding sheet to the concrete wall, applying an arbitrary adhesive or the like according to the properties of the sheet, and using a construction method to stick to the concrete surface, Even when cracks occur in the concrete and a defect such that water passes is generated, it is possible to better maintain the waterproof performance at the water-impervious wall.

  In the embodiment, the asphalt mixture layer 32 and the water shielding sheet 32a are installed on the sea (bank body) side of the upper concrete 31. On the other hand, the groundwater level on the deposition site side is In a landfill that is assumed to be high, the vertical water shielding layer may be constructed on the landfill side or so as to surround the whole. Further, in the example described in FIG. 5, between the vertical walls 32, 32 a due to the asphalt mixture and the water shielding wall 15, with respect to other portions blocked by the lower block 33, The water shielding layer 33a is formed by placing an asphalt mixture with an arbitrary thickness or by spreading a water shielding sheet or the like. This prevents water from flowing toward the layer 13 of the backfill site through the lower part of the vertical wall 32 even when a crack or the like occurs in the upper member 16 which is a concrete wall. . That is, by providing an integrated water shielding layer between the water shielding layer 33 a and the connection block 33, the water shielding action between the main body of the water shielding wall 15 and the vertical wall 32 is achieved. It is maintained well so that the reliability of the revetment can be maintained well.

  The water-impervious sheet 32a arranged along the surface of the upper concrete is constructed such that a pressing concrete block 36 and a water-impervious asphalt block 36a are constructed at the lower part thereof, and the lower end of the sheet 32a is fixedly held. And between the said water-impervious sheet 32a and the water-impervious wall 15, it was additionally constructed on the upper part of the water-impervious wall 15 by using a block of water-impervious asphalt so as not to generate a gap. The member and the wall body constructed by arranging sheet piles or the like are integrated so that the water shielding property can be maintained.

  As described in each of the above-described embodiments, it is relatively easy to significantly improve the waste storage capacity in the deposition site by raising the water-impervious wall. By the way, the method of raising the water-impervious wall can exhibit the same effect even when raising only the impermeable wall without raising the embankment of the revetment main body at the same time as raising the revetment main body at the same time. is there. In other words, when building a dike as a partition revetment in the vicinity of the coast and constructing a waste disposal site, the height of the revetment main body is the level when the sea is rough before increasing its capacity However, it is constructed so that the seawater does not flow into the depository.

Therefore, the outer revetment is basically designed so that the sedimentation site can be protected from rough waves without raising it, and the impermeable wall has sewage generated on the sedimentation site side. It has a function of partitioning so as not to flow out.
As explained in the previous embodiment, the means for raising the impermeable wall is used to increase the capacity for storing waste at the sedimentation site. Often constructed with a balanced structure. In order to raise the revetment main body, on the existing caisson as the revetment main body, it is further formed so as to mount a small caisson, or a concrete is placed with a formwork. Therefore, the revetment main body can be raised.

  Of the additional construction means for the water shielding layer disclosed in each of the above embodiments, the deposition is performed by selecting and applying one optimum means according to the environment of the waste disposal site or the required conditions. It becomes possible to improve the capacity of the place. Of the above methods, the method of additionally constructing the impermeable layer after raising the impermeable wall is also applicable to the impermeable method described in FIGS. For example, as shown in Fig. 2, after the construction of an additional concrete layer is performed low on the concrete wall provided on the top of the sheet pile wall, it can be handled by adding a water shielding layer to the surface. is there. In addition, for the upper concrete layer of the existing sheet pile wall, after only adding measures to prevent water leakage, such as blocking cracks, the area around the upper member and the connection to the sheet pile are newly added. It is also possible to easily cope with repair work such as constructing a water-impervious layer by using the means described later.

In the revetment main body which raises the height, the original revetment is constructed higher than the sea level. The water wall prevents the sewage generated inside the sedimentation field from flowing out.
However, depending on the environment of the waste disposal site or the required conditions, only the revetment main body is raised, but it is also assumed that the impermeable wall is not raised. In such a case, it is also required to perform a water shielding treatment on the revetment main body that has been raised so that the revetment itself can exert a strong water shielding property.

  Then, the example in the case of raising the outer revetment main body among the revetments which a waste disposal site partitions, and increasing the accommodation capacity of a sedimentation place, leaving a water-impervious wall as it is is demonstrated. In the example shown in FIG. 7, among the raising methods illustrated in FIG. 3, only the raising portion 10 a in the revetment main body 10 is constructed and the water shielding treatment is simultaneously applied to the main part of the raising portion. The water wall 15 can be used in the state indicated by the solid line, and can be made to cope with it by stacking a high amount of waste behind it.

  In the example shown in FIG. 7, the raised portion 10 a is constructed using means such as newly placing concrete on the upper part of the existing revetment main body 10. In the revetment main body 10, the caissons 11 and the like are arranged in a line, and between the caissons, for example, a caisson as described in JP-A-2004-108142 is disclosed. The water stop means between them is used. And it demonstrates below on the premise that it is comprised as what can demonstrate the water-proofing in the said partition revetment main body itself favorable.

  Therefore, as in the conventional example, with respect to the revetment main body 10 provided with the water shielding means between the caissons, the water shielding is also applied to a gap such as a small caisson to be additionally formed on the upper part. Process to give it. For example, the gap 40 between the caissons may be constructed together with the water-impervious layer of the revetment main body, but the vertical water-impervious layers 41 and 41a are constructed at arbitrary positions, and the raised portion 10a is also shielded. Processing is performed so that the water layer functions. As the water-impervious treatment layers 41 and 41a, in addition to applying the water-impervious means disclosed in the above publication, it is needless to say that any conventionally known water-impervious treatment means may be applied. is there.

  In addition to the water-impervious treatment between the additionally constructed structures as described above, the raised portion 10a of the revetment main body is provided with a water-impervious coating so as to cover the surface or an asphalt mixture is predetermined. It is possible to attach the surface water-impervious layer 42 by adhering to the surface of the main body. As the water-impervious surface water-impervious layer 42, an arbitrary water-impervious sheet, such as an arbitrary water-impervious sheet, is attached or an asphalt mat is attached to the surface of the structure. Is possible. In addition, by providing protrusions etc. on the surface of the additional structure and constructing the water shielding layer with any thickness using the protrusions, a water shielding layer that does not cause gaps is constructed. it can. And in the concrete of the raising part added additionally, even if a crack generate | occur | produces with a time-dependent change etc., the water-impervious body in the revetment main body 10 and 10a as a water-impervious structure can be ensured.

  In the example shown in FIG. 7, since the raised portion is not constructed for the water shielding wall 15, as shown in the drawing, a new portion is newly formed inside the deposition portion partitioned by the water shielding wall. The waste 7a to be dumped is stacked so as to form a slope having a predetermined angle so that the end portion does not collapse. Furthermore, the waste layer newly dumped (deposited) as described above can be disposed of by covering the surface with a layer of covering soil with a predetermined thickness, or by covering with a water shielding sheet or the like. A process is performed to prevent excessive water from being added to the water.

  The water shielding layer provided so as to cover the surface of the newly stacked waste should be formed so that no gap is formed in the water shielding layer by using means for connecting with the water shielding layer of the existing water shielding wall 14. Thus, water containing pollutants can be prevented from flowing out of the disposal site. Moreover, the surface impermeable layer 42 newly provided so as to cover the raised portion 10a of the additional revetment main body is formed as an integral impermeable layer over the entire additional construction portion and the upper surface of the existing main body. If formed, it is possible to maintain the water shielding effect well. In addition, the water-impervious layer 42 to be newly constructed should be at least capable of exerting water-impervious properties to the inside of the revetment main body.

  In addition, in the example shown in the said FIG. 7, although the process which specifically water-blocks between the two impermeable walls is not performed, the waste material of the concrete which does not contain a pollutant, etc. is applied to the part. By performing a process such as flat filling, an extra step is not newly formed. Moreover, the water-impervious partition that partitions the waste pile 7a to be additionally discarded and the end portion of the surface water-impervious layer 42 covering the surface of the raised portion of the revetment main body are stacked on the backfill soil. When pressed by non-polluting soil and fixedly held, the respective water shielding layers can be stably maintained.

It is explanatory drawing of a structure of management type revetment. It is explanatory drawing of the example which repairs a water-impervious wall. It is explanatory drawing of the example which raises a management type revetment. It is explanatory drawing of the raising part of a water-impervious wall. It is a top view which shows the structure of the raising part of a water-impervious wall. It is explanatory drawing of another Example of the water shielding layer added to a water shielding wall. It is explanatory drawing of the example which raises a bank protection main body.

Explanation of symbols

1 management type revetment, 2 impermeable formation, 3 impermeable formation, 4 rubble foundation, 7 filling layer, 8 covering soil, 10 revetment main body, 11 caisson,
13 Backing layer, 14 Management pipe, 15 Water-impervious wall, 16 Upper member, 17 Cover member, 18 Layer of asphalt mixture, 19 Support member,
20 steel pipe sheet piles, 21 main connection parts, 22 connection pipes,
24,25 Sub-connection part, 28 Mortar filling part,
30 Upper raising work, 31 Upper concrete,
32 asphalt mixture walls, 37 management pipes,
40 connection part, 41 impermeable layer, 42 surface impermeable layer.

Claims (14)

It is a waste disposal site that constructs and divides a bank in any sea area,
In the management-type revetment that is provided by combining the revetment body constructed on the sea side and the impermeable wall disposed on the disposal site with a predetermined interval with respect to the revetment body,
In order to prevent water leakage at the upper part of the sheet pile wall of the impermeable wall,
Build a water shielding layer along the concrete wall provided above the sheet pile wall, and integrate it with the wall,
An additional construction method for a water shielding layer, wherein the water shielding layer is integrated with a lower sheet pile wall. In the concrete wall above the sheet pile wall, or when impediments to the water shielding performance at the connection between the sheet pile wall and the concrete wall,
The sheet pile wall is exposed to a predetermined height, a water shielding layer is constructed so as to cover the concrete wall from the exposed portion of the sheet pile wall, and the water shielding layer is integrated with the water shielding wall and buried. Returning, The said water-impervious layer is integrated with a sheet pile wall, The additional construction method of the water-impervious layer of Claim 1 characterized by the above-mentioned.   The water shielding layer constructed integrally with the sheet pile wall is constructed of a layer of asphalt mixture with a predetermined thickness, or a sheet having water shielding properties is provided along the concrete wall. The additional construction method of the water shielding layer according to claim 2, wherein It is a waste disposal site that constructs and divides a bank in any sea area,
In the management-type revetment that is provided by combining the revetment body constructed on the sea side and the impermeable wall disposed on the disposal site with a predetermined interval with respect to the revetment body,
Each of the revetment main body and the impermeable wall, or by raising the upper part of one of them to an arbitrary height, as a means for increasing the waste storage volume in the waste disposal site deposition site,
The raised portion of the revetment main body is provided by building a concrete layer on the main body,
In the raised portion of the impermeable wall, the upper portion of the impermeable wall is included at a predetermined height, and is constructed as an additional concrete wall with a predetermined thickness,
Addition of water-impervious layer characterized in that the water-impervious wall and the raised portion of the water-impervious wall are subjected to water-impervious treatment, and the water-impervious layer is constructed so as to partition the deposition site with respect to the surrounding part Construction method. In the partition revetment, when raising only the revetment main body and improving the storage capacity at the sedimentation site,
By adding a raised part of the levee body main body, and by performing a water shielding treatment on the raised part of the additional built dam body body,
The additional construction method for the water-impervious layer according to claim 4, wherein the water is contacted with the waste on the deposition site side so that the water does not flow outside. In the partition revetment, in order to raise only the revetment main body, a caisson is built on the levee body, or
Using means to build up the raised part of the levee body, such as adding and building concrete walls on the dam body,
Water is applied to the raised part of the levee body constructed in addition to the raised part of the levee body, and water that touches the waste on the deposition site flows out to the outside. The additional construction method of the water-impervious layer according to claim 4, wherein partitioning is performed so as not to occur. The raised part of the impermeable wall to be constructed additionally includes the upper part of the existing impermeable wall by a predetermined height to construct a concrete wall having an arbitrary width and height,
5. The water shielding layer according to claim 4, wherein a water shielding layer is formed by performing a treatment for imparting water shielding to both of the additionally constructed concrete wall and the existing water shielding wall. Additional construction method. In addition to the raised portion of the impermeable wall to be constructed, in the impermeable layer to be additionally constructed,
A layer of an asphalt mixture is erected along the water shielding layer, and a water shielding treatment is performed so that water does not flow between the layer of the asphalt mixture and the existing water shielding layer. The additional construction method of the impermeable layer of Claim 6 or 7.   The impermeable layer provided along the impermeable wall acts as a impermeable layer integrated with the impermeable wall by the impermeable sheet disposed in the upper part and the asphalt mixture layer constructed in the lower part. The additional construction method of the water-impervious layer according to claim 8, wherein the method is configured. In the raised portion of the impermeable wall, a management pipe connected to the joint portion of the impermeable wall is provided upright in the additionally constructed concrete wall,
The additional construction method for a water shielding layer according to any one of claims 6 to 9, wherein the management pipe is provided by being filled with the same filler as that of the joint. In the sheet pile wall constructed with a predetermined interval for the revetment main body of the levee body, connecting the sheet piles standing in the row with a joint portion,
The interior space of the joint is filled with a water shielding material to maintain water shielding,
The pipe for management provided to stand in the additional concrete wall is filled with the same material as the water shielding material,
11. The water-impervious structure according to claim 10, wherein the state of the water-impervious walls in the upper raised portion and the base portion can be confirmed using means for observing the level of the water-impervious material accommodated in the management pipe. Additional construction method for layers. The revetment main body of the levee body is a management type revetment constructed by raising only the impermeable wall without raising it,
In the raised impermeable wall, construct a impermeable layer that separates the sedimentation site from the open sea side,
The additional construction method of the impermeable layer according to claim 8, wherein a impermeable layer is also provided on the ground surface between the revetment main body and the raised impermeable wall. The sheet pile wall that constitutes the water shielding wall is constructed by standing up in a row a sheet pile that can stand independently such as a steel sheet pile, a steel pipe sheet pile or a steel sheet pile,
The internal space of the joint between the sheet piles is filled with a water-impervious material having fluidity,
Communicating the connection part of the impermeable wall filled with the impermeable material and the management pipe provided in the raised additional concrete wall, and observing the state of the impermeable material using the administrative pipe The additional construction method of the water-impervious layer according to claim 12, characterized in that it is possible. When the impermeable wall is incapable of being self-supporting, the impermeable wall in which the sheet piles are erected in a row by performing the impermeable treatment is erected using the support / connecting means with respect to the revetment main body, A back layer is provided between the revetment body and the impermeable wall,
5. The water shielding layer according to claim 4, wherein a raised portion is constructed at a predetermined height on each of the water shielding wall and the revetment main body, and the surface of the back layer is covered with the water shielding layer. Additional construction method.

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