JP4629559B2 - Drain structure and construction method of drain structure - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a drain structure and a drain structure construction method, and more particularly, to a drain structure and a drain that are embedded in a ground that is an inclined surface and discharge permeated water that has penetrated into the ground into a drainage channel that is installed below the inclined surface. It relates to the construction method of the structure.

  On slopes such as mountainsides, dikes, and beaches, landslides may occur due to water that has penetrated due to rainfall. For example, in a river embankment, as shown in FIG. 13, the infiltrating surface 16 in the embankment is caused by rainfall or water penetrating from the river 14 during a flood or the like. It becomes higher than the bottom of the slope (the lower end of the slope) and water leaks, or it is eroded and collapsed. One of such measures for water leakage and seepage erosion is drain work. The drain construction is a structure in which, for example, a drainage layer made of gravel or the like is formed on the back edge of the dike, and the infiltrating surface 16 in the levee body is made lower than the back edge of the back wall, and the permeated water is drained from the drainage layer.

  In Patent Document 1, a grid-like water-permeable pipe constructed by connecting water-permeable pipes such as net pipes in a vertical and horizontal grid pattern is arranged inside the back side of a dike and so on along the slope. The lower end is guided to the outside by a drain pipe, and a permeable mat of entangled fibers is respectively wound around the lateral permeable pipe of each step, which is a horizontal member constituting the lattice-shaped permeable drain pipe, at appropriate intervals, and A drain structure is described in which each wrapping end is extended laterally toward the inside of the levee body to form a priming mat belt portion.

  In Patent Document 2, a dam body infiltrated is formed on a foundation ground on the river back side of a levee body, and is formed by a filling rod filled with a coarse filter material filled with a steel assembly net through which osmotic water passes. It is composed of a smoke drain that allows water to flow in, a dyke channel provided at the bottom of the back of the levee, and a coarse filter material that allows permeate to pass through. And a drain layer that leads the permeated water flowing into the smoked drain part to the dike channel, and the drain layer has a thickness lower than the height of the smoked drain part. The drainage structure of the dike covered with soil is described.

Moreover, although it is not the drain structure of a river bank, the patent document 3 describes the drain structure which stabilizes the beach by efficiently draining the wave going up to the beach and lowering the groundwater level.
Japanese Utility Model Publication No. 57-60917 JP 2002-121720 A Japanese Patent Laid-Open No. 7-207639

  However, in the drain structure described in Patent Document 1, since the portion where the permeated water flows is a pipe, when the amount of permeated water increases, all cannot be discharged, and water leakage and permeation erosion occur. In addition, since pipes are easily clogged, it is necessary to change pipes frequently, resulting in high construction costs.

  On the other hand, since the drain structure described in Patent Document 2 requires a drain layer connecting the smoked drain part and the dike channel, it is difficult to construct unless it is a long gentle slope, and the applicable slope is In addition to being limited, it is necessary to increase the excavation distance from the dike channel to the river side, and the construction becomes large. In addition, the drain structure described in Patent Document 3 returns seawater that has risen from the sea to the beach through the basement and returns to the sea, and there is a problem that application to river embankments is difficult.

  This invention is made | formed in view of this point, The place made into the objective provides the drain structure in which construction can be performed easily regardless of the magnitude of the slope of a slope, and reliable drainage is possible. There is.

  In order to solve the above problems, the drain structure of the present invention is a drain structure that is embedded in the ground which is a slope and discharges the permeated water that has penetrated into the ground into a drainage channel installed below the slope. The smoked drain is formed by a basket made of a wire mesh filled with a coarse filter material through which the permeated water passes, and has a smoked drain portion that guides the permeated water to the drainage channel. The portion is configured by stacking a plurality of the ridges and covered with earth and sand, and the ridge includes a front metal mesh on the front side from the lower end of the slope toward the slope, and the plurality of the plurality of stacked Each of the front metal meshes of the coffin is disposed on the near side from the lower end of the slope toward the slope as the coffin placed on the lower side is connected to the upper side of each of the front metal meshes of the plurality of coffins Above slope and Inclined upper surface is parallel crucible has a structure which is formed by a wire mesh on the upper surface of the cage made of drain unit. By having such a configuration, a large amount of permeated water surely flows through the coarse filter material filled in the cage made of wire mesh. In addition, since the inclined upper surface and the ground slope are substantially parallel to each other, it is possible to reliably hold the earth and sand on the slope.

  The construction method of the drain structure of the present invention is a construction method of a drain structure that is embedded in the ground that is a slope and drains the permeated water that has permeated into the ground into a drainage channel installed below the slope, The drain structure has at least two ridges made of a wire mesh, and the heel has a front wire mesh made of a welded wire mesh arranged on the near side from the lower end of the slope toward the slope, Installing the first ridge on a substantially horizontal foundation ground, filling the first ridge with a coarse filter material, and second ridge on the first ridge. The front metal mesh of the second ridge is substantially parallel to the front metal mesh of the first ridge and is positioned on the back side from the lower end of the slope to the slope more than the front metal mesh of the first ridge; Filling the second basket with a coarse filter material, A step of placing a coarse filter material above the first hook and before the front hook of the second hook, and the front hook of the second hook above the first hook. A step of placing a rhombus metal mesh on a coarse filter material placed at the front position and fixing the rhombus metal mesh on the upper side of the front metal mesh of the first and second ridges; and earth and sand on the drain structure A step of covering.

  Here, the coarse filter material has a particle size larger than the earth and sand constituting the ground, which is a slope, and includes, for example, gravel, stones, rock fragments, concrete fragments, and the like. it can.

  The drain structure of the present invention has a smoked drain portion formed by stacking a plurality of baskets made of wire mesh, and the basket is filled with a coarse filter material, so that the permeated water is surely drained. In addition, the upper surface of the smoked drain portion is formed of a wire mesh and is connected to the upper side of each of the front metal meshes of the plurality of bags to form a sloped upper surface that is substantially parallel to the slope. By adjusting the distance between the front metal meshes of the piles that are stacked according to the inclination, it is possible to cope with various required inclination angles.

  Before describing the embodiment of the present invention, the present inventors have considered another drain structure using a wire netting, so this consideration will be described. The important points in the drain structure are the size of the cross-sectional area in the section perpendicular to the longitudinal direction of the levee body (hereinafter referred to as the capacity), and the side closest to the river of the drain structure at the same level as the drainage channel ( In the following, the heel part) is how close to the river, so these are also explained.

  FIG. 14 shows a drain structure assumed when the inclination angle of the back slope 12 of the levee body 10 is about 25 degrees. This drain structure is referred to as Comparative Example 1. It is set as the smoked drain part which fills the cracks 40 and 40 which consist of a rhombus metal net with cracked stone, and lets permeate flow. The smoked drain part is installed in the back slope 12 with rectangular parallelepiped gauze fences 40, 40 inclined substantially the same as the back slope 12, and a heel part is brought closer to the river 14 by placing a stone 41 below it. The capacity is increased, and the top surface of the smoke drain is covered with earth and sand. In addition, a drain layer 42 is provided for connecting the drainage channel 20 installed at the back butt and the smoked drain portion. The drain layer 42 is a wire mesh basket installed horizontally. The reason for providing the drain layer 42 is that when the drainage channel 20 is brought into direct contact with the smoked drain portion installed at an inclination, the drainage channel 20 is pressurized from the smoked drain portion, and the drainage channel 20 is in the right side of the figure. Because it will fall over.

  FIG. 15 also shows another drain structure assumed when the inclination angle of the back slope 12 'of the dam body 10 is about 25 degrees. This drain structure is referred to as Comparative Example 2. The smoked drain part, in which three wire mesh cages 44, 44, 44 made of rhombus wire meshes are stacked stepwise, has a permeated water passage at a high position. The capacity can be increased by arranging a large number of the wire mesh baskets 44, 44, 44. In addition, the smoke drain is installed in the vicinity of the back butt. Also in this case, earth and sand are covered on the upper surface of the metal mesh cage 44, 44, 44 and in front of the front surface (the surface facing the rear edge of the cage).

  Since the two drain structures described above are filled with cracked stone in a wire mesh basket, a large amount of permeated water can be reliably drained. In addition, the metal mesh fences 40 and 44 made of rhombus metal mesh are used in a drain structure here because they are used in large quantities for flood control work and earth retaining work and are inexpensive.

  The drain structure of Comparative Example 1 is more preferable when considering the earth and sand covered with the wire mesh cages 40 and 44. This is because the top surface of the wire netting ridge 40 is covered with earth and sand with a substantially uniform thickness. In the case of the earth and sand like the comparative example 2, when the earth and sand are pressed and hardened, the sand can collapse. This is not preferable because the wire netting 44 is likely to be exposed. However, since the drain structure of Comparative Example 1 is installed with the wire mesh fence 40 inclined, if the inclination angle increases, the wire mesh fence 40 may slide down in the tilt direction, making the construction difficult, and a gentle slope. It can be applied only to the other dam body 10, and construction on a gentle slope is also difficult. Furthermore, since the drain layer 42 which is a horizontal part is required, an extra area | region is required for the installation from a back surface bottom to a horizontal ground.

  In consideration of the construction, both the drain structures of Comparative Examples 1 and 2 shown in FIGS. 14 and 15 are supported by placing the wire mesh rods 40 and 44 on the ground excavating the slope so as not to be crushed (diamonds). It is necessary to do the work of stuffing stones (because the cage made of wire mesh does not stand on its own and collapses). Therefore, it is a large and troublesome work, and it takes time and cost. In particular, since the drain structure of Comparative Example 2 does not have an upper surface portion substantially parallel to the slope, it is necessary to increase the cross-sectional area of the dredging in order to secure the drainage capacity, and the amount of excavation increases, which takes extra time and cost. End up. In addition, the cage made of rhombus wire swells in the horizontal direction due to the pressure of the stone after the stones are piled up or the pressure of the earth and sand on the stone, so that the drainage channel 20 is damaged due to the force applied to the drainage channel 20. There is a fear.

  In view of such considerations and the problems of the drain structure described in Patent Documents 1 to 3, the inventors of the present application have come up with the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following drawings, components having substantially the same function are denoted by the same reference numerals for the sake of brevity.

(Embodiment 1)
A schematic cross section of the drain structure according to Embodiment 1 is shown in FIG. In addition, in order to make a figure legible, many hatching showing a cross section is abbreviate | omitted. The drain structure according to the present embodiment is embedded in the ground of the back slope (slope) 12 of the levee body 10, and the infiltrating surface 16 in the levee body continuous from the water surface of the river 14 is formed on the back slope 12 side. The permeated water is led down to the drainage channel 20 installed at the back end. This drain structure is composed of three cages 31, 32, 33 made of wire mesh, and the cages 31, 32, 33 are filled with crushed stones 23, 23,. Yes. Since the cracked stones 23, 23,... Have a diameter of several centimeters to several tens of centimeters, the permeated water flows through these gaps. Although not shown, a water-permeable sheet such as a nonwoven fabric is hung on the upper surface, rear surface (river 24 side) and side surfaces of the ridges 31, 32, 33 so that earth and sand do not enter the gaps between the filter materials. Yes.

  As shown in FIG. 1, the drain structure according to the present embodiment has a pentagonal shape in which a corner of a rectangle is notched and formed as a hypotenuse in a cross section, on an inclined upper surface 35 corresponding to the hypotenuse part. Is covered with earth and sand 22, and the inclined upper surface 35 and the back slope 12 are substantially parallel to each other. The angle formed by the inclined upper surface 35 and the horizontal plane is 27 °. The first ridge 31 constituting the lowest stage of the drain structure is installed on the foundation ground 21 below the back slope 12, and the second ridge 32 is stacked thereon, and further on the first ridge 31. Three ridges 33 are stacked. The foundation ground 12 is excavated substantially horizontally.

  FIG. 2 is a side view of the stacked structure of the cages 31, 32, and 33 constituting the drain structure. The metal meshes that form the cages 31, 32, and 33 and the cages 31, 32, and 33 are connected and fixed by coils 51, 51,.

  FIG. 3 is a perspective view in which the wire mesh constituting the lowermost first brim 31 is separated. The first ridge 31 is an L-shaped front-side L-shaped metal mesh 57 in which the front metal mesh 53 and a part of the bottom metal mesh are integrated, and the back metal mesh 52 and a part of the bottom metal mesh are integrated. The rear side L-shaped metal mesh 56 having an L shape in side view, a bottom intermediate metal mesh 54, and two side metal meshes 55, 55 are included. Each wire mesh consists of a rectangular welded wire mesh that connects steel bars and metal wires. The front-side L-shaped metal mesh 57 and the back-side L-shaped metal mesh 56 are made by bending a rectangular flat welding metal mesh, and have the same shape and are interchangeable. Further, the front side L-shaped metal mesh 57 and the back side L-shaped metal mesh 56 are L-shaped on surfaces perpendicular to the front surface and the back surface, respectively. These wire meshes are fixed to each other by being connected to each other by adjacent wire meshes and coils 51 (only one is shown and the others are omitted), and assembled into a bag shape. In the present embodiment, these wire meshes are made of iron wire that has been subjected to rust prevention processing (for example, hot dip galvanization, zinc aluminum alloy plating, etc.).

  FIG. 4 is a perspective view in which the metal nets constituting the second cage 32 placed on the first cage 31 are separated. Since the second ridge 32 is substantially the same as the first ridge 31 and only a part thereof is different, the different portion will be described.

  The second hook 32 includes two triangular wire mesh portions 58 and 58 extending forward from the side of the front wire mesh 53 (the direction from the back to the front, and the following directions are in accordance with this definition). The side wire meshes 65, 65 are trapezoidal. The bottom intermediate wire mesh 64 has a length in the front-rear direction smaller than that of the first collar 31 by the length of the lower side of the triangular wire mesh portions 58 and 58. The lengths of the side wire meshes 65 and 65 are similarly reduced. Although not shown, a rhombus metal mesh is connected to the upper side of the front metal mesh 53 and the oblique sides of the triangular metal mesh portions 58 and 58 to form the inclined upper surface 35. In addition, the bottom metal mesh is not disposed in the portion sandwiched between the two triangular wire mesh portions 58, 58, but in this portion, the split stones 23, 23,... The bottom wire mesh may be omitted, but the bottom wire mesh may be disposed. In addition, it is easier to place the cracked stones 23, 23,. The reason why the bottom metal mesh is disposed between the front metal mesh 53 and the back metal mesh 52 is to support the front metal mesh 53, the back metal mesh 52, and the side metal meshes 65 and 65 so as not to fall down.

  FIG. 5 is a perspective view in which the metal mesh constituting the third ridge 33 placed on the second ridge 32 is separated. Since the third ridge 33 is substantially the same as the second ridge 32 and only a part thereof is different, the different portion will be described.

  The third rod 33 does not have a bottom intermediate wire mesh, and the lengths of the side wire meshes 75 and 75 are reduced accordingly. The bottom metal mesh is not disposed between the two triangular metal mesh portions 58 and 58, and the rhombus metal mesh constituting the inclined upper surface 35 is the same as the second cage 32.

  As shown in FIGS. 2 to 5, the rectangular parallelepiped portions of the three flanges 31, 32, and 33 have the same size and shape of the front metal mesh 53 and the rear metal mesh 52, but the bottom and side surfaces in the front-rear direction. The length is different. On the bottom surface, the difference in length is adjusted by inserting bottom metal meshes 54 and 64. The side wire meshes 55, 65, 75 correspond to each other by changing the length itself.

  FIG. 6 is a perspective view of the drainage channel 20. The back surface 27 abuts against the front metal mesh 53 of the first rod 31, and the water flowing through the first rod 31 flows into the grooves of the drainage channel 20 through the holes 28, 28,. Discharged.

  Next, the construction method of the drain structure of this embodiment is demonstrated.

  First, in FIG. 1, the back slope 12 side of the dam body 10 is excavated to form a substantially horizontal foundation ground 21. And the drainage channel 20 is installed in the part used as a back butt. The position of the drainage channel 20 is strictly determined in advance, and it is very difficult to put a stone in a wire netting and install it in a precise position, so the drainage channel 20 is first installed.

  Next, the wire mesh group shown in FIG. 3 is placed on the foundation ground 21, the wire meshes are connected by the coil 51, and the first rod 31 is assembled and installed. The front wire mesh 53 is installed in contact with the back surface 27 of the drainage channel 20. At this time, the front-side L-shaped metal mesh 57 and the rear-side L-shaped metal mesh 56 are self-supporting, and the side-surface metal meshes 55 and 55 are also leaned against the front-side L-shaped metal mesh 57 and the rear-side L-shaped metal mesh 56. There is no need to support it, and it can be easily installed in a short time with a small number of people.

  Then, the first basket 31 is filled with the cracked stones 23, 23,.

  4 is placed on the first cage 31 filled with the walnut stones 23, 23,..., And the second cage 32 is assembled and installed by connecting the meshes with the coil 51. Also in this case, it can be installed easily and in a short time by a small number of people as in the assembly of the first basket 31. At this time, the back metal meshes 52 and 52 of the two hooks 31 and 32 are arranged so as to be flush with each other, and the upper and lower hooks 31 and 32 are also connected using the coil 51. In the state in which the second ridge 32 is installed, a part of the first ridge 31 is covered with the bottom surface of the second ridge 32, and the uncovered portion is sandwiched between the triangular metal mesh portions 58 and 58. It is in a state. Further, the front metal mesh 53 of the second cage 32 is located behind the front metal mesh 53 of the first cage 31, and the two front metal meshes 53, 53 are substantially parallel.

  After this, the second basket 32 is filled with the split stones 23, 23,. Then, the stones 23, 23,... Are placed on the portion above the first cage 31 and sandwiched between the triangular wire mesh portions 58, 58 (the front side of the front wire mesh 53 of the second cage 32). .. Of this portion are placed so as to reach the surface connecting the hypotenuses of the two triangular wire mesh portions 58, 58. When the cricket stones 23, 23,... Are filled and placed in this manner, the state shown in FIG. In FIG. 7, the coil 51 is omitted for easy viewing.

  Next, a group of wire meshes shown in FIG. 5 is placed on the second cage 32 filled with the walnut stones 23, 23,... . Also in this case, it can be installed easily and in a short time by a small number of people as in the assembly of the first basket 31. At this time, similarly to the case where the second cage 32 is installed, the rear meshes 52, 52, 52 of the three cages 31, 32, 33 are arranged so as to be flush with each other, and the upper and lower cages 32, 33 are arranged. The coil 51 is also used for the connection between them. In the state in which the third ridge 33 is installed, the bottom surface of the third ridge 33 is covered with a part of the second ridge 32 as when the second ridge 32 is installed. The unexposed portion is sandwiched between the triangular wire mesh portions 58 and 58. The front metal mesh 53 of the third cage 33 is located behind the front metal mesh 53 of the second cage 32, and the two front metal meshes 53, 53 are substantially parallel.

  Then, the third basket 33 is filled with the cracked stones 23, 23,. After that, the ritual stones 23, 23,... Are placed on the portion above the second cage 32 and sandwiched between the triangular wire mesh portions 58, 58 (the front side of the front wire mesh 53 of the third cage 33). .. Of this portion are placed so as to reach the surface connecting the hypotenuses of the two triangular wire mesh portions 58, 58.

  Further, as shown in FIG. 8, a rhombus wire mesh 37 wound in a roll shape is placed on the upper side portion of the front wire mesh 53 of the third rod 33, and then the rhombus wire mesh 37 is expanded from the roll shape, .. 58, 58,... Are placed on the slope on which the cracking stones 23, 23,. Thus, as shown in FIG. 9, the inclined upper surface 35 is formed by the rhombus metal mesh 37. In FIGS. 8 and 9, the coil 51 is omitted for easy viewing. Then, the rhombus wire mesh 37, the upper side of each front wire mesh 53, 53, 53 and the oblique sides of the triangular wire mesh portions 58, 58,.

  Next, a water-permeable sheet is put on the back surface of each of the collars 31, 32, 33, the upper surface of the third collar 33, and the inclined upper surface 35. Then, the drain structure shown in FIG. 1 is completed by covering the water-permeable sheet with earth and sand 22.

  The drain structure according to the present embodiment has the structure described above, and has the following effects.

  The drain structure according to the present embodiment is formed by stacking three ridges 31, 32, 33 made of a plurality of wire meshes, and the front side L-shaped wire mesh 57 that is a constituent member of these ridges 31, 32, 33. And the rear side L-shaped metal mesh 56 can be used in common for all the cages 31, 32, 33, so that the manufacturing cost of the cages 31, 32, 33 is reduced. Since the pots 31, 32, and 33 are filled with the cracked stones 23, 23,..., A large amount of permeated water can be reliably drained. In addition, the inclination angle of the back slope 12 varies depending on the construction site, but any inclination angle can be accommodated by adjusting the length in the front-rear direction of the bottom intermediate metal meshes 54, 64. Get smaller. Furthermore, since the inclined upper surface 35 is substantially parallel to the back slope 12, the earth and sand covered on the drain structure has a uniform thickness and is less likely to collapse. The main body portions (front surface, back surface, side surface, bottom surface) of the rods 31, 32, 33 are made of welded wire mesh, so that they have high strength and rigidity, while the inclined upper surface 35 has a flexible rhombus wire mesh. By using 37, it is easy to cover, and construction can be performed easily. In addition, since the three rods 31, 32, 33 are all stacked in a horizontal plane and have sufficient structural strength against the horizontal force, the horizontal force is applied to the drainage channel 20. Therefore, it is not necessary to provide the horizontal drain layer 42 as shown in FIG. 14, and the installation area in the horizontal direction can be reduced accordingly. For this reason, it is possible to secure a wide area of private land and dike roads.

  The construction method of the drain structure according to the present embodiment has the steps described above and has the following effects.

  In the construction method of the drain structure of the present embodiment, the wire mesh constituting the inclined upper surface 35 is placed after filling and placing the cracking stones 23, 23,..., Before filling the cracking stones 23, 23,. In addition, it is possible to easily fill the inclined portions 23, 23,... In particular, when the angle of inclination of the inclined upper surface (relative to the horizontal plane) is 34 ° or less, the inclined upper surface 35 is formed of a wire mesh before filling the cracked stones 23, 23,. ,... Without any gaps are very laborious and increase construction costs. Therefore, the drain structure construction method of this embodiment is useful when the angle between the inclined upper surface 35 and the horizontal plane is 34 ° or less. is there. In addition, when the inclination angle is less than 18 °, when the earth and sand covered on the drain structure is pressed and hardened by a machine, the cracked stones 23, 23,. The inclined upper surface 35 is not always necessary.

(Embodiment 2)
FIG. 10 shows a schematic side view of the drain structure according to the second embodiment. The drain structure according to the present embodiment is formed by stacking three cages 61, 62, and 63 made of wire mesh as in the case of Embodiment 1, but the embodiment is that the back wire mesh of each cage is not flush. Since the other points are the same as those of the first embodiment, only the differences from the first embodiment will be described.

  In the drain structure of the present embodiment, the rear metal mesh of the second collar 62 is disposed rearward of the rear metal mesh of the first collar 61, and the third collar is disposed behind the rear metal mesh of the second collar 62. The rear metal mesh 63 is disposed rearward. Therefore, although the amount of excavation can be reduced as compared with the drain structure of the first embodiment, the heel portion is far from the river 14 and the drainage tends to be insufficient, and the capacity is small, so the maximum drainage amount is reduced and sinks. There is a fear. Other effects are the same as those of the first embodiment.

(Embodiment 3)
A schematic side view of the drain structure according to Embodiment 3 is shown in FIG. The drain structure according to the present embodiment is formed by stacking three ridges 71, 72, 73 made of wire mesh as in the first embodiment, but the embodiment is that the back wire mesh of each heel is not flush. Since the other points are the same as those of the first embodiment, only the differences from the first embodiment will be described.

  In the drain structure of the present embodiment, the rear metal mesh of the second collar 72 is disposed in front of the rear metal mesh of the first collar 71, and the third collar than the rear metal mesh of the second collar 72. The rear metal mesh 73 is arranged in front. Therefore, it is necessary to increase the amount of excavation for installation as compared with the drain structure of Embodiment 1, and the cost increases. However, since the capacity is large and the heel part is close to the river 14, the drainage capacity is large. Other effects are the same as those of the first embodiment.

(Other embodiments)
The embodiments described so far are examples of the present invention, and the present invention is not limited to these examples. For example, a wire mesh may be put on the upper surface of the third rod 33. Moreover, the wire mesh which comprises the side surface of each cage | basket does not need to be a single piece, and may connect several wire meshes. Or you may put the inner frame for reinforcement inside each cage.

  A plurality of front wire meshes and back wire meshes may be arranged along the river flow direction to form a long drain structure, or the width of the front wire mesh and the back metal mesh may be increased to form a long drain structure.

  The coarse filter material is not limited to cracked stone, but any material such as gravel, crushed concrete (crushed concrete structure), rock crushed material, etc. that can be filled in the pot and can be used for water flow. Absent.

  The drainage channel may not be installed before the piles are piled up. Moreover, you may provide the drain layer 42 as shown in FIG. 14 between a drainage channel and a smoked drain part.

  The rhombus wire mesh that forms the inclined slope 35 may not be a roll. A flat panel shape may be placed on a wire netting with the cracked stones 23, 23,.

  As shown in FIG. 12, it is preferable to connect each ridge to the bottom metal mesh with a reinforcing member 59 so as not to fall down due to the pressure of the filter material filled with the back metal mesh 52. This reinforcing member 59 is preferably installed also on the front metal mesh 53 and the side metal mesh 55, 65, 75.

  In the construction of the above embodiment, the foundation ground is formed by excavating the levee body. However, a drain structure may be installed on a flat ground, and a slope may be formed by covering the soil with sand. . In addition, the drain structure is not limited to the embankment, and may be located anywhere as long as it is a slope such as a mountainside. For example, if installed on a mountainside, landslides can be prevented from occurring due to heavy rainfall. The construction method is the same as the method described in the above embodiment.

  As described above, since the drain structure according to the present invention can be easily installed on various slopes at low cost and can be drained reliably, it is useful as a drain structure for a bank.

2 is a schematic cross-sectional view of a drain structure according to Embodiment 1. FIG. FIG. 3 is a schematic side view of a wire mesh cage constituting the drain structure according to Embodiment 1. It is a figure of the metal-mesh group which comprises the 1st fence. It is a figure of the metal-mesh group which comprises the 2nd fence. It is a figure of the metal-mesh group which comprises a 3rd cage | basket. It is a perspective view of a drainage channel. It is a typical perspective view which shows the middle of construction of the drain structure which concerns on Embodiment 1. FIG. It is another schematic perspective view which shows the construction middle of the drain structure which concerns on Embodiment 1. FIG. It is another schematic perspective view which shows the middle of construction of the drain structure which concerns on Embodiment 1. FIG. It is a typical side view of the wire mesh cage which comprises the drain structure which concerns on Embodiment 2. FIG. It is a typical side view of the wire mesh cage which comprises the drain structure which concerns on Embodiment 3. It is a perspective view which shows the reinforcement member of a back metal mesh. It is a figure which shows the cross section of an embankment. 6 is a schematic cross-sectional view of a drain structure according to Comparative Example 1. FIG. 6 is a schematic cross-sectional view of a drain structure according to Comparative Example 2. FIG.

Explanation of symbols

10 Dike body 12 Back slope (ground which is a slope)
20 Drainage channel 21 Foundation ground 22 Sediment 23 Cracked stone (coarse grain filter material)
31, 61, 71 First rod 32, 62, 72 Second rod 33, 63, 73 Third rod 35 Inclined upper surface 52 Back wire mesh 53 Front wire mesh

Claims (9)

A drain structure embedded in the ground that is a slope and draining the permeated water that has penetrated into the ground into a drainage channel installed below the slope,
It is formed by a basket made of a wire mesh filled with a coarse filter material through which the permeated water passes, and has a smoked drain portion that guides the permeated water to the drainage channel,
The smoked drain part is configured by stacking a plurality of firewood and is covered with earth and sand,
The scissors are provided with a front metal mesh on the front side in the direction from the lower end of the slope toward the upper end of the slope,
Each of the front metal meshes of the plurality of piles stacked is arranged on the near side in the direction from the lower end of the slope toward the upper end of the slope as the bowl placed on the lower side,
A drain structure in which an inclined upper surface that is connected to an upper side of the front metal mesh of each of the plurality of ridges and is substantially parallel to the inclined surface is formed on the upper surface of the smoked drain portion by a metal mesh.   The drain structure according to claim 1, wherein the front wire mesh is a welded wire mesh, and the wire mesh forming the inclined upper surface is a rhombus wire mesh.   The drain structure according to claim 1 or 2, wherein an angle formed by the inclined upper surface and a horizontal plane is 18 ° or more and 34 ° or less.   The drain structure according to any one of claims 1 to 3, wherein the drainage channel is installed at a lower end of the slope. The hook is provided with a back metal mesh made of a welded wire mesh on the back side in a direction from the lower end of the slope toward the upper end of the slope, and each of the back metal meshes is disposed substantially flush with each other. The drain structure according to any one of the above. The rod is further provided with a bottom wire mesh made of a welded wire mesh,
6. The drain structure according to claim 1, wherein a part of the bottom wire mesh and the front wire mesh, and another part of the bottom wire mesh and the back wire mesh are integrally formed. It is a construction method of a drain structure that is buried in the ground which is a slope and drains the permeated water that has penetrated into the ground into a drainage channel installed below the slope,
The drain structure has at least two ridges made of a wire mesh, and the heel has a front wire mesh made of a welded wire mesh arranged on the front side in a direction from the lower end of the slope toward the upper end of the slope,
Installing the first ridge on a foundation ground that is substantially horizontal below the slope;
Filling the first basket with a coarse filter material;
The second ridge is placed on the first ridge, the front wire mesh of the second ridge is substantially parallel to the front wire mesh of the first heel, and the lower end of the slope is higher than the front wire mesh of the first heel. A step of being installed so as to be located on the back side in the direction facing
Filling the second ridge with a coarse filter material, and placing the coarse filter material above the first ridge and in front of the front metal mesh of the second ridge;
A rhombus wire mesh is placed on the coarse-grained filter material placed above the first cage and in front of the front mesh of the second cage, and the front mesh of the first and second cages Fixing the rhombus wire mesh on the upper side;
A method for constructing the drain structure, comprising: covering the drain structure with earth and sand.   Furthermore, the construction method of the drain structure of Claim 7 including the process of making the front metal mesh of a said 1st fence contact | abut to a drainage channel.   The construction method of the drain structure according to claim 7 or 8, wherein an angle formed by a surface formed by the rhombus wire mesh in a portion fixed to an upper side of the front wire mesh and a horizontal surface is 18 ° or more and 34 ° or less.

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