JP2019163636A - Acidic water drainage structure and acidic water drainage method in sloped face - Google Patents

Abstract

To provide an acidic water drainage structure in a sloped face which can properly drain acidic water in a sloped face and is easily applied.SOLUTION: A quadrangular frame-shaped slope frame 1 is disposed in a grid-shape on a sloped face 101. A drain hole 11a is formed in a lateral frame portion 11 extending in a lateral direction of the slope frame 1. The vertically adjacent drain holes 11a of the lateral frame portion 11 are connected with each other by a water collecting and draining material 4 arranged in an inside 1a of the slope frame, being long and having water collecting and draining property. A belt-shaped water permeable mat 32 having water permeability is arranged downwardly from an acidic water deposition position in the inside 1a of the slope frame toward the water collecting and draining material 4. The acidic water W deposited from the acidic water deposition position is collected into the water collecting and draining material 4 via the water permeable mat 32, and flows downward through the drain holes 11a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an acidic water drainage structure and an acidic water drainage method in a slope for draining acidic water caused by pyrite in the slope.

In cutting slope construction, in order to stabilize the cut slope for a long period of time, it is common to install square frame-shaped concrete frame in a grid and green the inside of the frame (spraying thick layer base material) Has been done. On the other hand, when pyrite (FeS ₂ ) is contained in the ground of the cut slope, brown acid water may precipitate due to the chemical reaction of pyrite with water and air along with the outflow of groundwater from the slope. There is. When acid water is precipitated, there is a possibility that the growth of plants that have been greened in the frame of the plant will be adversely affected, the soundness will be reduced due to the neutralization of the frame of the frame, and the appearance will be deteriorated due to brown discoloration. Moreover, as long as pyrite is contained in the natural ground of the cutting slope, precipitation of acidic water cannot be stopped.

  Therefore, a drainage structure is known in which water in the embankment containing an acidic water generating substance can be discharged (see, for example, Patent Document 1). This drainage structure is provided with a vertical gutter penetrating the embankment in the vertical direction in order to discharge the permeated rainwater, and provided with water passage holes on the side surface, and a neutralizing material is provided around the vertical gutter together with stones and the like. And the acidic water produced by the contact of rain water and pyrite is neutralized with a neutralizing material and then guided into the vertical shaft.

JP 2010-242451 A

  By the way, the infiltration direction of groundwater is not one direction, but the groundwater infiltrates from every place and direction. For this reason, when applying the drainage structure described in Patent Document 1, it is necessary to install vertical gutters at many places and dispose a neutralizing material or the like around them, which is a large-scale construction and is not realistic.

  Accordingly, an object of the present invention is to provide an acidic water drainage structure and an acidic water drainage method in a slope that can appropriately drain acidic water in a slope and are easy to apply.

  In order to solve the above-mentioned problem, the invention of claim 1 is characterized in that a square frame-like frame is installed in a lattice shape on the slope, and a drain hole is formed in a horizontal frame portion extending in the lateral direction of the frame. The drainage holes of the horizontal frame portions adjacent to each other in the vertical direction are connected with a long drainage collecting / draining material disposed in the method frame and having a water permeability, and a belt-like water-permeable mat having water permeability is Disposed downward from the acidic water precipitation point in the method frame toward the drainage material, the acidic water deposited from the acidic water precipitation point is collected in the drainage material via the water permeable mat, It is the acidic water drainage structure in the slope characterized by flowing down through a drain hole.

  According to this invention, the acid water deposited from the acid water precipitation site is permeated and permeated into the water permeable mat and flows downward to be collected in the drainage material, and flows through the drainage material and passes through the lower drainage hole. . In this way, the acidic water deposited within each method frame is sequentially drained downward through the lower drainage holes.

  According to a second aspect of the present invention, in the acidic water drainage structure according to the first aspect, the drainage material and the water permeable mat are covered with a concrete layer.

  According to a third aspect of the present invention, there is provided the acidic water drainage structure according to the first or second aspect, wherein a water-permeable belt-like underlaying water-permeable mat is disposed under the drainage material, and the water-permeable mat is the acidic water-draining structure. It arrange | positions downward toward the said water-permeable mat for underlays from a water precipitation location, It is characterized by the above-mentioned.

  The invention of claim 4 is the acidic water drainage structure according to claims 1 to 3, further comprising a drain pipe for guiding the acidic water to the drainage channel from the drain hole of the horizontal frame portion located at the lowest end. It is characterized by.

  The invention according to claim 5 is characterized in that a square frame-shaped frame is installed in a lattice shape on the slope, a drain hole is formed in a horizontal frame portion extending in the lateral direction of the frame, and the horizontal frame portion adjacent vertically. The water drainage holes are connected to each other by a long and drainage collecting and drainage material disposed in the frame, and a water-permeable belt-like water-permeable mat is attached to the acidic water precipitation site in the frame. The acid water deposited from the acid water precipitation point is collected in the water collection material through the water permeable mat, and flows downward through the drain hole. It is the acidic water drainage method in the slope characterized by this.

  According to the inventions of claims 1 and 5, the acidic water precipitated in each method frame is collected by the drainage material through the water-permeable mat and flows downward through the drainage hole. It becomes possible to drain the acidic water appropriately. As a result, it becomes possible to maintain the soundness of the slope for a long time (it is possible to prevent weathering of the slope and to prevent neutralization and discoloration of the concrete frame concrete). In addition, the drainage holes of the horizontal frame portions adjacent to each other in the upper and lower sides are connected with a drainage material, and the water-permeable mat may be disposed downward from the acidic water precipitation point toward the drainage material, so that it can be easily applied. Is possible (realizable).

  According to the invention of claim 2, since the drainage material and the permeable mat are covered with the concrete layer, the drainage material and the permeable mat can be disposed and fixed firmly and stably, and the drainage material. It is possible to prevent the water-permeable mat from being discolored and the appearance from being impaired.

  According to the invention of claim 3, the permeable mat for the underlay is disposed under the drainage material, and the permeable mat is disposed toward the permeable mat for the underlay. Water is efficiently collected into the drainage material through the permeable mat for the underlay. As a result, it is possible to efficiently drain the acidic water deposited within the legal framework without leakage.

  According to invention of Claim 4, since the drainage pipe | tube which guides acidic water to a drainage channel is provided from the drain hole of the horizontal frame part located in the lowest end, acidic water can be efficiently flowed to a drainage channel without a leak. In addition, the surface from the horizontal frame portion to the drainage channel can be prevented from being discolored by acidic water.

It is side surface sectional drawing which shows the acidic water drainage structure in the center part of the slope which concerns on embodiment of this invention. It is side surface sectional drawing which shows the acidic water drainage structure in the lower end part of the slope which concerns on embodiment of this invention. It is a front view of the acidic water drainage structure of FIG. It is AA sectional drawing of FIG. It is the front view (a) and side view (b) which show the drainage material in the acidic water drainage structure of FIG. It is the front view which shows the acidic water drainage method in the slope which concerns on embodiment of this invention, and shows the state which confirmed the acidic water precipitation location in a method frame. FIG. 7 is a front view showing a state in which an underwater permeable mat and a permeable mat are disposed following FIG. 6. FIG. 8 is a front view showing a state in which the drainage material is disposed following FIG. 7. It is a perspective view which shows the state which installed the frame on the slope which concerns on embodiment of this invention.

  The present invention will be described below based on the illustrated embodiments.

  1 to 9 show an embodiment of the present invention, and FIGS. 1 and 2 show an acidic water drainage structure (hereinafter simply referred to as an “acidic water drainage structure”) in a slope according to this embodiment. FIG. 1 is a side sectional view, FIG. 1 shows a central portion of the slope 101, and FIG. 2 shows a lower end of the slope 101. This acidic water drainage structure is a structure for draining acidic water W caused by pyrite or the like on a slope 101 that is a slope made by cutting or embankment, etc. The precipitated acidic water W is drained by flowing downward.

  First, a square frame-like frame 1 is installed in a grid pattern on the slope 101. That is, as shown in FIG. 9, a plurality of horizontal frame portions 11 made of concrete (including mortar) and extending in the horizontal and horizontal directions are installed at predetermined intervals in the vertical direction of the slope 101, and made of concrete in the vertical and vertical directions. A plurality of vertical frame portions 12 extending in the direction are installed at a predetermined interval in the left-right direction of the slope 101, so that the square-frame-like frame 1 is continuously placed on the slope 101 in a lattice shape. Therefore, the vertical frame 1 adjacent to the upper and lower sides and the left and right shares the horizontal frame portion 11 and the vertical frame portion 12.

  Moreover, as shown in FIG.1 and FIG.3, the drain hole 11a penetrated up and down is formed in the center part of the horizontal frame part 11 extended in the horizontal direction of each method frame 1, and also this drain hole 11a. A tubular drain pipe 2 is inserted and attached to the. Here, the inner diameter of the drain pipe 2 is set so that the acidic water W deposited in each method frame 1a can flow downward.

  Then, the drain holes 11a of the horizontal frame portions 11 adjacent to each other, that is, the drain pipes 2 are connected to each other by a long drainage collecting / draining material 4 disposed in the legal frame 1a. . That is, as shown in FIG. 5, the drainage material 4 is formed by solidifying the wire and has many voids, so that it has high water collection and drainage (spotted shape, sponge shape) and is deformed. In this embodiment, it is formed in an air circular tube having a hole 4a in the axial center. Such a drainage / drainage material 4 is disposed in the frame 1a of each frame 1 and, as shown in FIGS. 1 and 3, one end is inserted into the upper drainage pipe 2 and the other end is lower water. It is inserted into the extraction pipe 2. Here, the inner and outer diameters and the drainage performance of the drainage material 4 are set so that the acidic water W precipitated in each method frame 1a can flow downward.

  Further, under the drainage material 4, as shown in FIGS. 3 and 4, a belt-shaped underlay permeable mat 31 having water permeability is disposed. That is, the permeable mat 31 for the underlay is a band-like body that is porous and has high water permeability and water permeability, and is laid so that the lower surface is in contact with the slope 101 of the inner frame 1a and connects the upper and lower drainage pipes 2 together. Has been. And the drainage material 4 is arrange | positioned so that the upper surface of the water-permeable mat 31 for underlay may be contacted over substantially the whole length of a longitudinal direction.

  Here, the width of the permeable mat 31 for the underlay is set to be larger than the outer diameter of the drainage material 4 so that the acidic water W can be efficiently exchanged without leakage. Further, the underlaying permeable mat 31 is disposed downward along the slope 101 by being laid so as to connect the upper and lower drainage pipes 2. Further, the lower surface (the slope 101 side) of the underlay permeable mat 31 is covered with a non-permeable sheet or the like, so that acidic water W from the permeable mat 32 to be described later does not flow to the slope 101 side and is efficiently leak-free. It may be transmitted to the drainage material 4.

  Further, a belt-like water-permeable mat 32 having water permeability is disposed downward from the acidic water precipitation point P in the method frame 1a toward the drainage material 4, that is, the underlay water-permeable mat 31. That is, the water-permeable mat 32 is a band-like body that is porous and has high water permeability and water permeability. As shown in FIG. 7, the bottom surface is in contact with the slope 101 of the inside of the frame 1a, and one end side is an acid water precipitation site. P is covered, and the other end is laid so as to overlap with the underlay permeable mat 31.

  At this time, the water permeable mat 32 is disposed so as to face downward from one end side to the other end side. In other words, the water permeable mat 32 is arranged like a branch extending upward with the water permeable mat 31 for the underlay as a trunk when viewed from the front. In this way, since the water permeable mat 32 is disposed downward toward the underlay permeable mat 31, the acidic water W precipitated from the acidic water precipitation point P is efficiently along the slope of the slope 101 by its own weight. It flows to the permeable mat 31 for the underlay.

  Moreover, in this embodiment, the other end side of the water-permeable mat 32 overlaps with the water-permeable mat 31 for the underlay, and as shown in FIG. 8, the drainage material 4 is disposed thereon. Furthermore, the width | variety of the water-permeable mat 32 is set so that the acidic water W can be exchanged efficiently without leaking. Here, the acidic water precipitation location P is a location where the acidic water W is precipitated in the method frame 1a or a location where the acidic water W is predicted to be deposited, and the precipitation, cracking, discoloration, etc. of the acidic water W can be confirmed by visual observation. This is a location, a location where precipitation of acidic water W can be confirmed by a PH test or the like.

  In this way, by providing the underlay permeable mat 31, the permeable mat 32, and the drainage material 4, the acidic water W precipitated from the acidic water precipitation portion P is converted into the permeable mat 32 and the underlay permeable mat 31. Then, the water is collected in the drainage material 4 and flows downward through the drain hole 11a, that is, the drain pipe 2. That is, the acidic water W deposited from the acidic water deposition point P is permeated and permeated into the water permeable mat 32, flows downward, is transmitted to the underlay permeable mat 31, and is collected in the drainage material 4. Then, the acidic water W flows downward through the drainage material 4 and flows through the lower drainage pipe 2 to the lower legal frame 1a side. In this way, the acidic water W precipitated in each legal frame 1a is sequentially discharged downward through the lower drainage pipe 2.

  Furthermore, the underlay water permeable mat 31, the water permeable mat 32, and the drainage material 4 are covered with a concrete layer 5. That is, as shown in FIGS. 3 and 4, concrete is sprayed on the entire surface of the inside of the frame 1 a to form a concrete layer 5.

  On the other hand, at the lower end portion of the slope 101, that is, the drainage channel 110 side, the acidic water W is drained from the drainage hole 11a of the horizontal frame portion 11 located at the lowermost end, that is, the drainage pipe 2, as shown in FIG. A drain pipe 21 leading to 110 is provided. That is, one end of the drain pipe 21 is connected to the drain pipe 2 located at the lowermost end, the drain pipe 21 is laid along the road surface 102, and the other end reaches the drain path 110. Thereby, the acidic water W precipitated in each legal frame 1 a flows through the drain pipe 21 and is drained to the drainage channel 110.

  Here, the upper surface of the drainage channel 110 is flush with the road surface 102. Further, a U-shaped accommodation groove may be formed in the road surface 102, and the drain pipe 21 may be disposed and accommodated in the accommodation groove so that the drain pipe 21 does not protrude from the road surface 102. It may be embedded in and connected to the drainage channel 110 in the ground. In this embodiment, a V-shaped groove 1b is formed in the lowermost horizontal frame portion 11, and a part of the drainage pipe 2 at the lowermost end is exposed from the groove 1b.

  Next, a method for creating an acidic water drainage structure having such a configuration, that is, an acidic water drainage method on the slope (hereinafter simply referred to as “acidic water drainage method”) will be described.

  First, as shown in FIG. 9, a rectangular frame-shaped frame 1 is installed in a grid pattern on the plane 101 (a frame-setting step), and water is drained into the horizontal frame portion 11 extending in the horizontal direction of each frame 1. The hole 11a is formed, and the drain pipe 2 is attached (drain hole forming step). Next, as shown in FIG. 6, for each method frame 1, an acidic water precipitation point P is specified by visual observation, a PH test, or the like (deposition point specifying step). Subsequently, as shown in FIG. 7, an underlay permeable mat 31 is laid so as to connect the upper and lower drainage pipes 2, and from the acidic water precipitation point P in the frame 1 a toward the underlay permeable mat 31. Then, the water-permeable mat 32 is laid downward (water-permeable mat placement step). Here, in FIG. 7, the water permeable mats 32 are laid on the two acid water precipitation points P, respectively.

  Next, as shown in FIG. 8, the drainage pipes 2 of the horizontal frame portions 11 adjacent to each other in the vertical direction are connected to each other by a long drainage collecting / draining material 4 disposed in the legal frame 1a. (Collecting and draining material arrangement step). And as shown in FIG. 3, the concrete layer 5 is formed so that the whole surface of the inside of a method frame 1a may be covered (concrete layer formation step). Further, the drain pipe 21 is connected to the drain pipe 2 at the lowermost end, and the drain pipe 21 is extended to the drain channel 110 and disposed.

  As described above, according to the acidic water drainage structure and the acidic water drainage method, the acidic water W precipitated in each method frame 1a is collected in the drainage material 4 through the water permeable mat 32 and drained holes 11a. That is, since it flows downward through the drain pipe 2, the acidic water W on the slope 101 can be drained appropriately. As a result, the soundness (non-weathering, non-discoloration, etc.) of the slope 101 can be maintained for a long time. Moreover, the drainage pipes 2 of the horizontal frame portions 11 adjacent to each other in the vertical direction are connected by the drainage material 4 and the water-permeable mat 32 is disposed downward from the acidic water precipitation point P toward the drainage material 4. It can be easily applied (realized).

  Further, since the inside of the frame 1a including the drainage material 4 and the water permeable mat 32 is covered with the concrete layer 5, the drainage material 4 and the water permeable mat 32 can be disposed and fixed firmly and stably. At the same time, it is possible to prevent the appearance and the appearance of the drainage material 4 and the water permeable mat 32 from being discolored.

  Furthermore, since the underwater permeable mat 31 is disposed under the drainage material 4 and the permeable mat 32 is disposed toward the underlay permeable mat 31, the acid water W flowing from the permeable mat 32 is Water is efficiently collected in the drainage material 4 through the underlay permeable mat 31. That is, since the underlay permeable mat 31 and the permeable mat 32 overlap and are in surface contact, the acidic water W from the permeable mat 32 efficiently flows into the underlay permeable mat 31. Moreover, since the underlay permeable mat 31 and the drainage material 4 are in contact with each other over almost the entire length in the longitudinal direction, the acidic water W efficiently permeates and permeates from the underlay permeable mat 31 into the drainage material 4. As a result, it becomes possible to drain the acidic water W precipitated in the method frame 1a efficiently without leakage.

  On the other hand, since the drain pipe 21 for guiding the acidic water W to the drainage channel 110 is provided from the drain pipe 2 of the horizontal frame portion 11 located at the lowermost end, the acidic water W can be efficiently flowed to the drainage channel 110 without leakage. In addition, it is possible to prevent the road surface 102 from the horizontal frame portion 11 to the drainage channel 110 from being discolored by the acidic water W.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the drainage pipe 2 is attached to the drainage hole 11a, but the drainage holes 11a may be directly connected to each other by the drainage material 4 without disposing the drainage pipe 2. Good. Further, the drain pipes 2 adjacent to each other in the vertical direction are arranged concentrically, but may not be arranged concentrically according to the shape of the slope 101 or the like.

DESCRIPTION OF SYMBOLS 1 Method frame 1a Inside frame 11 Horizontal frame part 11a Drain hole 12 Vertical frame part 2 Drain pipe 21 Drain pipe 31 Permeable mat for underlay 32 Permeable mat 4 Drainage material 5 Concrete layer 101 Slope 110 Drainage channel W Acidic water P Acidic water precipitation location

Claims (5)

A square frame-shaped frame is installed in a grid on the slope,
A drain hole is formed in the horizontal frame portion extending in the horizontal direction of the normal frame,
The drainage holes of the horizontal frame portions adjacent to each other in the vertical direction are connected with a drainage material having a long shape and a drainage property disposed in the method frame,
A band-shaped water-permeable mat having water permeability is disposed downward from the acidic water precipitation point in the method frame toward the drainage material,
Acidic water deposited from the acidic water precipitation point is collected in the drainage material through the water-permeable mat, and flows downward through the drainage hole.
The acidic water drainage structure in the slope which is characterized by this. The drainage material and the water permeable mat are covered with a concrete layer,
The acidic water drainage structure in the slope of Claim 1 characterized by the above-mentioned. A belt-shaped underlay permeable mat having water permeability is disposed under the drainage material,
The water-permeable mat is disposed downward from the acidic water precipitation point toward the underlay water-permeable mat,
The acidic water drainage structure on a slope according to any one of claims 1 and 2. A drainage pipe for guiding the acidic water to a drainage channel from a drain hole of the horizontal frame portion located at the lowest end,
The acidic water drainage structure in the slope of any one of Claim 1 to 3 characterized by the above-mentioned. A square frame-shaped frame is installed in a grid on the slope,
Forming a drain hole in the horizontal frame portion extending in the horizontal direction of the normal frame;
The drain holes of the horizontal frame portions adjacent to each other in the vertical direction are connected with a drainage material that is disposed in the method frame and has a long shape and has a drainage property,
A band-shaped water-permeable mat having water permeability is disposed downward from the acidic water precipitation point in the method frame toward the drainage material,
Acidic water deposited from the acidic water precipitation site is collected in the drainage material through the water-permeable mat, and flows downward through the drain hole.
An acidic water drainage method in a slope characterized by that.

Images