JP2006274655A - Drain structure of banking levee body and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain structure of a banking levee body and its construction method capable of simply and effectively carrying out a repair and maintenance by improving workability and maintenance efficiency of the drain structure for raising mechanical stability by lowering a seepage line in the banking levee body. <P>SOLUTION: The drain structure of the banking levee body is equipped with an artificial drain material 4 consisting of at least either one of a pipe-like drain material buried in the back slope side of the banking levee body 2 and passing seepage water there-through or a sheet drain material. Namely, the back slope side of the banking levee body 2 is excavated, and after the artificial drain material 4 consisting of at least either one of the pipe-like drain material passing the seepage water there-through or the sheet drain material has been constructed in the excavated section, the excavated section is made to back fill to bury the artificial drain material 4 in the banking levee body 2. Concretely, after the artificial drain material 4 has been constructed, the excavated section is made to back fill to bury also the artificial filter material 5 in the banking levee body 2 after the artificial filter material 5 has been constructed in the back slope side of the banking levee body 2 to connect with the artificial drain material 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drain structure that simplifies repair / maintenance of a bank embankment and a construction method thereof.

In rivers and ponds, there are various methods for repairing embankments that are generally unstable due to rising infiltration lines (groundwater level). For example, a method of removing a bank embankment and building a new bank, a method of embedding the embankment on the current bank, a method of attaching a sheet to the slope of the bank and blocking the water, natural materials in the bank In general, a drain filter material (gravel, sand, etc.) is laid and drained (see, for example, Patent Document 1).
JP 2002-121720 A

However, in the case of the method of removing the embankment embankment and newly embanking the embankment, a long construction period and a great expense are required. In particular, in the case of a bank such as a reservoir, if the construction period is long, there will be a problem that it cannot be planted.
In addition, the method of embankment embankment embankment requires the acquisition of a new site, and the method of pasting sheets on the slope of embankment embankment and blocking the water is not very effective during heavy rain. is there.
And, as in Patent Document 1, in the case of a method of draining by draining a natural material drain filter material (gravel, sand, etc.) in the embankment embankment, with the depletion of natural materials such as gravel, sand, etc. Obtaining high-quality materials is difficult, and there is a risk of natural destruction when collecting gravel, sand, etc., and there is a problem of clogging of drain and filter materials due to gravel, sand, etc., and replacement is easy. Such as maintenance is not possible. In addition, since large heavy machinery and a large amount of material are required for laying gravel, sand, etc., it is necessary to construct a construction road for transporting the material and heavy machinery, which increases the cost.

  The object of the present invention is to improve the workability and maintainability of the drain structure for lowering the infiltration line and increasing the mechanical stability in the embankment embankment so that repair and maintenance can be performed easily and effectively. It is to be.

  In order to solve the above problems, the invention described in claim 1 is a drain structure for draining the seepage water of the embankment bank body to the back slope side, for example, as shown in FIG. 1 and FIG. An artificial drain material 4 is provided which is embedded on the back slope side of the body 2 and is made of at least one of a pipe-shaped drain material or a planar drain material through which permeated water passes.

In this way, by embedding an artificial drain material composed of at least one of a pipe-shaped drain material or a planar drain material through which osmotic water passes on the back slope side of the embankment levee body, ) Can be drained to the back slope side through artificial drain material. This lowers the infiltration line (groundwater level) of the embankment embankment and increases the mechanical stability of the embankment embankment.
Moreover, since it is only necessary to embed an artificial drain material composed of at least one of a pipe-shaped drain material or a planar drain material through which permeated water passes, it is excellent in workability compared to the case of embedding natural materials such as gravel and sand. At the same time, it is excellent in maintenance such as cleaning and replacement of the drain material.

  The invention according to claim 2 is the drainage structure of the embankment bank body according to claim 1, and the artificial drain is formed on the back slope side of the embankment bank body 2, for example, as shown in FIGS. 1 and 2. An artificial filter material 5 connected to the material 4 is provided.

  Thus, the outflow of the embankment accompanying drainage can be prevented by connecting the artificial filter material to the artificial drain material on the back slope side of the embankment bank body.

  The invention according to claim 3 is the drainage structure of the embankment embankment according to claim 1 or 2, wherein, for example, as shown in FIG. 1, the artificial drain material 4 is comb-shaped in plan view at intervals. It is provided in.

  In this way, if the artificial drain material is provided in a comb shape in plan view at intervals, the construction is easier than when the drain material is laid on the entire surface, and maintenance such as cleaning and replacement of the drain material is also possible. It becomes easy.

  Invention of Claim 4 is the drainage structure of the embankment embankment body as described in any one of Claim 1 to 3, Comprising: For example, as shown in FIG. 2, the said artificial drain material 4 is a back slope. It is characterized in that the opposite side is raised in the embankment bank body 2.

  Thus, if the artificial drain material is started up in the embankment on the opposite side to the back slope side, the water collection area of the drain material can be increased.

  The invention according to claim 5 is a drain construction method for draining the seepage water of the embankment bank body to the back slope side, for example, as shown in FIGS. 4 to 7, the back slope side of the embankment bank body 2. In the excavation part 21, the artificial drain material 4 made of at least one of a pipe-like drain material or a planar drain material through which permeated water passes is laid, and then the excavation part 21 is backfilled to attach the artificial drain material 4. It is embedded in the embankment dike body 2.

  In this way, artificial drainage material consisting of at least one of pipe-like drainage material or planar drainage material through which osmotic water passes is laid in the excavation part on the back slope side of the embankment bank body, and the excavation part is backfilled to fill the embankment bank By embedding in the body, as in the case of the invention described in claim 1, it is excellent in workability as compared with the case of embedding natural materials such as gravel and sand, and also in maintenance properties such as cleaning and replacement of drain materials. Excellent.

  The invention according to claim 6 is a method for draining a bank embankment according to claim 5, for example, as shown in FIG. 7, after laying the artificial drain material 4, the backside of the bank embankment body 2. After the artificial filter material 5 is laid on the surface side and connected to the artificial drain material 4, the excavation part 21 is backfilled and the artificial filter material 5 is also buried in the embankment bank 2.

  In this way, after laying the artificial drain material, lay the artificial filter material on the back slope side of the embankment dike body and connect it to the artificial drain material, then backfill the excavated part and embed the artificial filter material in the embankment dike body By doing so, the outflow of the embankment accompanying drainage can be prevented like the invention of Claim 2.

  The invention according to claim 7 is a drain construction method for draining the infiltrated water of the embankment bank body to the back slope side, and a pipe-shaped drain material for passing the infiltrated water to the back slope side of the embankment bank body 2 or The artificial drain material 4 made of at least one of the planar drain materials is inserted by, for example, press-fitting or horizontal boring to embed the artificial drain material 4 in the embankment bank 2.

  Thus, by inserting an artificial drain material consisting of at least one of a pipe-shaped drain material or a planar drain material through which permeated water passes into the back slope side of the embankment embankment, it is embedded in the embankment bank. Similar to the invention described in 1 or 5, it is excellent in workability as compared with the case of embedding natural materials such as gravel and sand, and is excellent in maintenance properties such as cleaning and replacement of the drain material.

  Invention of Claim 8 is the drain construction method of the embankment bank body of Claim 7, Comprising: After insertion of the said artificial drain material 4, the artificial filter material 5 is put on the back slope side of the embankment body 2 For example, the artificial filter material 5 is also embedded in the embankment bank body 2 by being inserted by press-fitting or horizontal boring or the like and connected to the artificial drain material 4.

Thus, after inserting the artificial drain material, by inserting the artificial filter material on the back slope side of the embankment bank body and connecting it to the artificial drain material, the artificial filter material is also embedded in the embankment bank body, Similarly to the invention according to Item 2 or 6, the embankment can be prevented from flowing out due to drainage.

  Invention of Claim 9 is the drain construction method of the embankment embankment as described in any one of Claim 5 to 8, Comprising: As shown, for example in FIGS. 5-7, the said artificial drain material 4 is used. Laid out in a comb shape in plan view at intervals.

  In this way, by constructing the artificial drain material in a comb shape in plan view at intervals, the construction is easier than in the case of laying the drain material on the entire surface, as in the invention of claim 2. Maintenance such as cleaning and replacement of materials is also facilitated.

  According to the present invention, the infiltration line of the embankment can be lowered by draining the permeated water through the artificial drain material to the back slope side, and the mechanical stability of the embankment can be improved. Because it is an artificial drain material consisting of at least one of a pipe-shaped drain material or a planar drain material, it offers superior workability compared to the case of embedding natural materials such as gravel and sand, and maintenance such as cleaning and replacement of the drain material. Advantages such as excellent properties can be obtained.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
1 and 2 showing the configuration of an embodiment to which the present invention is applied, 1 is water storage, 2 is a bank embankment, 3 is a bottom gutter (pipe), 4 is an artificial drain material, 5 is an artificial filter material, L is an infiltrating line.

The artificial drain material 4 is composed of at least one of a pipe-shaped drain material or a planar drain material through which permeated water passes, and on the back slope side of the embankment dike body 2, as shown in FIG. Arranged in a comb shape when viewed.
In addition, the artificial drain material 4 is raised in the embankment bank 2 on the opposite side to the back slope side in order to increase the water collection area. In the example of FIG. 2, the artificial drain material 4 includes a horizontal portion 41 and a vertical rising portion 42 that is continuous with the horizontal portion 41 at the infiltrating line L portion.

The artificial drain material 4 is, for example, a culvert drain pipe made of a hard and elastic PET bottle recycled monofilament knitted into a tube shape and wrapped with a PET recycled spunbond nonwoven fabric. Monodren (registered trademark) that has both functions and is effective in various drainage works is used.
This monodrain (registered trademark) has a tube-parallel structure, so it has excellent water collection, is flexible and conforms to the unevenness of the natural ground, is excellent in cold resistance, microbial resistance, and chemical resistance, and is long and lightweight for transportation and mounting. Features such as easy.

As shown in FIGS. 1 and 2, the artificial filter material 5 is embedded on the back slope of the embankment dike body 2 by connecting to the plurality of artificial drain materials 4 arranged in a comb shape in plan view as described above. ing.
As the artificial filter material 5, a filter material that allows water to pass and does not pass trickle sand is used. For example, Sandf (registered trademark) is a non-woven fabric that is made of polyester recycled from PET bottles, needle punched and binder processed, and has both filterability, durability, and strength, and is effective in various civil engineering works (rivers, creation, etc.) Is used.
This Sandoff (registered trademark) has features such as no clogging due to a non-woven structure, high water permeability even when compressed by earth pressure, no corrosion, light weight and easy handling and easy construction.

FIG. 3 illustrates the water channel A and the erosion zone B of the embankment bank body 2.
The present invention is a drain construction for preventing the occurrence and progression of piping by the water channel A. In FIG. 1, in order to prevent the problem of the erosion zone B, the water-impervious portion 31 is constructed around the bottom gutter 3. That is, the water-impervious portion 31 is constructed by injecting a chemical solution, mortar, or the like without excavating the embankment bank body 2 against water leakage around the bottom gutter 3.

Next, the concrete embankment body drain construction method is demonstrated.
FIG. 4 shows the excavation process. First, as shown in the figure, after draining from the bottom gutter 3 to lower the water level of the reservoir 1, the back slope of the embankment dike body 2 is partially excavated to the ground. The partial excavation part 21 is formed. This partial excavation part 21 has an excavation slope 23 continuous from an excavation bottom surface 22 to the ground.
Here, the earth and sand coming out from the partial excavation part 21 is temporarily placed. Further, the excavation slope 23 has a stable gradient or is supported by a reinforcing material in some cases.

After that, as shown in FIG. 5 showing the next artificial drain material laying step, the artificial drain material 4 is laid in parallel with the bottom rod 3 in the partial excavation portion 21. That is, the artificial drain material horizontal portion 41 is laid in parallel with the bottom rod 3 along the excavation bottom surface 22, and the artificial drain material rising portion 42 is laid in parallel with the bottom rod 3 along the excavation slope 23.
In this way, the artificial drain material 4 is laid in a comb shape in plan view with an interval between the partial excavation portions 21. In the illustrated example, five artificial drain members 4 are arranged on the partial excavation part 21 and laid.

  After that, as shown in FIG. 6 showing the next excavation part backfilling, artificial filter material laying and proximity part excavation steps, the adjacent part is excavated, and the excavated earth and sand is already laid with the artificial drain material 4 It backfills in the excavation part 21 (refer to the backfill earth and sand 25). At this time, the artificial filter material 5 is laid at right angles to the bottom rod 3 along the end portion of the excavation bottom surface 22 in a state of being connected to the end portion of the artificial drain material 4.

Thereafter, as shown in FIG. 7 showing the next repetition process, the artificial drain material laying process of FIG. 5 and the next excavation part backfilling, artificial filter material laying and proximity part excavation process of FIG. 6 are repeated.
Here, at the time of backfilling around the bottom gutter 3, the bottom gutter 3 is sprayed with bendnite or the like.

As described above, as shown in FIG. 8, the construction of the drain structure for the embankment bank body 2 is completed.
According to the above drain structure, in order to excavate and improve a part of the embankment embankment body 2, construction in service is possible.
In addition, the use of artificial materials for drains and filters is lightweight and has excellent workability, so there is no need for large heavy machinery or large dump trucks, and construction is possible even in narrow terrain or sites with small sites. is there. Therefore, both the construction period and cost can be reduced.

And after construction, since the drainage water in the embankment bank body 2 can be drained by the artificial drain material 4 and the artificial filter material 5, the infiltration line L is lowered, and the effective stress between the soil particles of the embankment bank body 2 is increased. To do. Therefore, the mechanical stability of the embankment dike body 2 is increased, and it is possible to prevent breakage and breakwater during heavy rain.
Further, the artificial drain material 4 and the artificial filter material 5 are clogged due to the inflow of soil particles over time and the drainage function is lowered. However, the artificial drain material 4 is obtained by excavating the back slope side of the embankment bank 2. In addition, maintenance work such as cleaning and replacement of the artificial filter material 5 is easy, and the function can be recovered by reducing the maintenance cost.

In the above embodiment, the artificial drain material 4 and the artificial filter material 5 are laid by excavating the back slope side of the embankment bank body 2, but the artificial drain material 4 and the artificial filter are disposed on the back slope side of the embankment bank body 2. The material 5 may be inserted and laid.
That is, on the back slope side of the embankment embankment body 2, a construction method is adopted in which the artificial drain material 4 and the artificial filter material 5 are press-fitted, or after the horizontal boring, the artificial drain material 4 and the artificial filter material 5 are inserted. Is also possible.

  FIG. 9 shows a connection example of the drain material and the filter material. The horizontal portion 41 and the rising portion 42 of the artificial drain material 4 are connected, and the artificial filter material 5 is connected to the tip of the horizontal portion 41 of the artificial drain material 4. To do. That is, as shown in the drawing, the nonwoven fabric type artificial filter material 5 is sandwiched so as to insert the tip of the horizontal portion 41 to be connected to the artificial drain material 4.

In the above, by installing a water level meter or a pore water pressure meter in the embankment dike 2 and monitoring the infiltration line L, the safety of the embankment dike body 2 is confirmed as needed, and the artificial drain material 4 and the artificial filter material 5 to know the maintenance time.
Thus, by quantitatively grasping the position of the infiltrating line L, the mechanical stability of the embankment body 2 can be grasped quantitatively, that is, the current stability of the embankment body 2 can be quantitatively evaluated and judged. can do. Therefore, it can be used for the maintenance repair plan of the embankment bank body 2 and the development grasp at the time of disaster.
Furthermore, by transferring the measurement data via a telephone line, the Internet, etc., it can be used as a judgment material such as an evacuation instruction at the time of a disaster.

FIG. 10 shows a configuration example of the embankment monitoring system.
In this monitoring system example, as shown in the figure, a water level gauge 101 is set in the reservoir 1, a pore water pressure gauge 102 and an infiltrating line measuring instrument 103 are embedded in the embankment bank body 2, and the rainfall on the embankment bank body 2 A total of 104 is installed. The measurement data of the water level gauge 101, the pore water pressure gauge 102, the infiltrating line measuring instrument 103 and the rain gauge 104 are sent to the local measurement system 110.
That is, the on-site measurement system 110 takes in the measurement data of the water level meter 101, the pore water pressure meter 102, the infiltration line measuring device 103, and the rain gauge 104 into the data logger 112 via the switch box 111 as shown in the figure. Then, the measurement data is transmitted to the communication modem 120 via the telephone line or the cellular phone line 116 by the communication modem 113 and is taken into the measurement personal computer 121.

In the above embodiment, the artificial drain material is laid in a comb shape, but the present invention is not limited to this, and the artificial drain material may be laid side by side on the entire surface of the excavation part.
Moreover, although it applied to the embankment body of a pond in embodiment, it is applicable similarly to the embankment body of a river.
Furthermore, the material, shape, and the like of the artificial drain material and the artificial filter material are not limited to those in the embodiment, and it is a matter of course that specific detailed structures and the like can be appropriately changed.

It is a schematic perspective view which shows the structure of one Embodiment of the embankment embankment to which this invention is applied. It is a principal part longitudinal cross-sectional view of the embankment bank of FIG. It is the longitudinal cross-sectional view (a) and schematic plan view (b) explaining the water path and erosion zone of a bank embankment. The drain construction procedure by this invention is shown, and it is the longitudinal cross-sectional view (a) and schematic plan view (b) which showed the excavation process. It is the longitudinal cross-sectional view (a) and schematic plan view (b) which showed the next artificial drain material laying process. It is the longitudinal cross-sectional view (a) and schematic plan view (b) which showed the following excavation part backfilling, artificial filter material laying, and the proximity | contact part excavation process. It is the longitudinal cross-sectional view (a) and schematic plan view (b) which showed the next repeating process. It is the longitudinal cross-sectional view (a) and schematic plan view (b) which showed drain construction completion. It is the top view (a) which shows the example of a connection of a drain material and a filter material, a side view (b), and sectional drawing (c). It is a schematic block diagram which shows an example of the monitoring system of a bank embankment.

Explanation of symbols

2 Embankment 21 Excavation part 22 Excavation bottom face 23 Excavation slope 25 Backfill earth and sand 4 Artificial drain material 41 Horizontal part 42 Rising part 5 Artificial filter material L Infiltrating line

Claims (9)

A drain structure that drains the seepage water of the embankment bank to the back slope side,
A drainage structure for an embankment bank, comprising an artificial drain material that is embedded on the back slope side of the embankment bank and is made of at least one of a pipe-like drainage material or a planar drainage material through which permeated water passes.   The drain structure of the embankment bank according to claim 1, further comprising an artificial filter material connected to the artificial drain material on the back slope side of the embankment bank body.   The drainage structure of an embankment embankment according to claim 1 or 2, wherein the artificial drain material is provided in a comb shape in plan view at intervals.   The drainage structure of a bank embankment according to any one of claims 1 to 3, wherein the artificial drain material is raised on the opposite side to the back slope side in the bank embankment. A drain construction method of draining the seepage water of the embankment bank to the back slope side,
Excavate the back slope side of the embankment bank,
After laying an artificial drain material consisting of at least one of a pipe-like drain material or a planar drain material that allows permeate water to pass through the excavated part,
A drain construction method for a bank embankment, wherein the excavated portion is backfilled and the artificial drain material is embedded in the bank embankment. After laying the artificial drain material,
The artificial filter material is laid on the back slope side of the embankment bank and connected to the artificial drain material, and then the excavation part is backfilled to embed the artificial filter material in the embankment bank. 5. A method for drain construction of embankment embankment according to 5. A drain construction method of draining the seepage water of the embankment bank to the back slope side,
The artificial drain material is embedded in the embankment bank by inserting an artificial drain material made of at least one of a pipe-shaped drain material or planar drain material through which permeated water passes on the back slope side of the embankment bank. Drain construction method for the embankment embankment that is characteristic. After inserting the artificial drain material,
8. The embankment according to claim 7, wherein the artificial filter material is also embedded in the embankment by inserting an artificial filter material on the back slope side of the embankment and connecting to the artificial drain material. Body drain construction method.   The drainage construction method for a bank embankment according to any one of claims 5 to 8, wherein the artificial drain material is laid in a comb shape in plan view at intervals.

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