JP2009161985A - Ground draining structure and method of constructing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground draining structure which positively prevents infiltration of water into a water cutoff region where water cutoff is implemented in the ground such as earth fill, from an external region outside the same, positively prevents collapse such as landslide not only in the water cutoff region such as the earth fill but also in foundation ground bearing the water cutoff region, and can be constructed easily and inexpensively even if the above preventions are achieved. <P>SOLUTION: According to the ground draining structure, vertical draining members 19 extending in the vertical direction is embedded in a gap between the water cutoff region 17 where water cutoff is implemented in the ground 1, and the external region 18 horizontally adjacent to the water cutoff region 17. Then water W flowing in the ground from the external region 18 to the water cutoff region 17 is collected inside the vertical draining members 19 to flow downward, and drained outward of the water cutoff region 17. The vertical draining members 19 are each a prefabricated product formed into a predetermined shape. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention suppresses water permeation from an external region outside the water-impervious region that is intended to impede water on the ground such as embankment and promotes drainage outside the impermeable region. The present invention relates to a ground drainage structure and a construction method thereof.

  Conventionally, the above ground drainage structure is disclosed in Patent Document 1 below. According to this publication, there is provided a vertical drainage material that is embedded between a water-impervious region that is intended to impede water in the ground and an external region that is adjacent to the water-impervious region in the horizontal direction and extends in the vertical direction. It has been. And the water flowing in the ground so as to go from the external area to the impermeable area is collected inside the vertical drainage material and flows down, and this water is drained toward the outside of the impermeable area. It is said that.

In addition, the drainage material in the conventional technique is crushed stone, and the crushed stone is filled between the side surface of the water-impervious reinforcing soil layer that is the water-impervious region and the cliff surface of the natural mountain that is the outer region. A wall is formed. As described above, the water flowing from the external region toward the water-impervious region is collected inside the drainage wall and flows down, and then drained.
JP 2004-232232 A

  By the way, as described above, the drainage material in the prior art is crushed stone, but such crushed stone is not uniform in shape and size. For this reason, when forming a drainage wall with this crushed stone, it is not easy to make the porosity and thickness dimension in each part of this drainage wall uniform. As a result, the water collection at each part of the drainage wall and the water flow performance after the water collection become uneven, and there is a risk that the prevention of water penetration into each part of the water shielding area may be insufficient. is there.

  Therefore, it is conceivable to increase the thickness of each part of the drainage wall as a whole to improve the performance of collecting water and flowing water as a whole. However, in this case, a large amount of crushed stone is required, and the operation of forming the drainage wall becomes complicated and expensive, that is, the construction of the ground drainage structure may be complicated and expensive.

  The present invention has been made paying attention to the above-described circumstances, and the object of the present invention is to provide water from an external region outside the water-impervious region intended to impede water on the ground such as embankment. More reliably prevent infiltration, in addition to the above-mentioned water-impervious areas such as embankments, and in addition to this, the foundation ground that supports this water-impervious area, more reliably prevent collapse such as landslides due to water permeability, And even if it does in this way, it is making it possible to construct the ground drainage structure easily and inexpensively.

The first aspect of the present invention is a vertical drainage that is embedded between a water-impervious region 17 that is intended to impede water in the ground 1 and an outer region 18 that is adjacent to the water-impervious region 17 in the horizontal direction and extends in the vertical direction. Water 19 that is provided with a material 19 and flows in the ground so as to go from the outer region 18 to the water-impervious region 17 is collected and flows down inside the vertical drainage material 19. In the ground drainage structure that is drained toward the outside of 17,
The vertical drainage material 19 is a ground drainage structure characterized in that it is a formed product formed in a predetermined shape in advance.

  The invention of claim 2 is provided with a laterally facing drainage material 30 which is embedded between the lower area 29 and a part of the ground 1 adjacent to the lower side of the impermeable area 17 and the impermeable area 17, The lower portion of the vertical drainage material 19 communicates with the external region 18 side, which is one end side of the lateral drainage material 30, while the other end portion is directed horizontally or obliquely downward from the vertical drainage material 19. The water that extends in the direction away from the vertical drainage material 19 flows from the one end side to the other end side of the horizontal drainage material 30, and the water W is drained toward the outside of the impermeable region 17. The ground drainage structure according to claim 1, wherein the lateral drainage material 30 is a formed product formed in a predetermined shape in advance.

  The invention of claim 3 is characterized in that the water shielding area 17 is formed by the embankment 10, and the upper surface of the lower area 29 is an inclined surface 3a inclined downward in the direction from the external area 18 toward the water shielding area 17. The ground drainage structure according to claim 2.

  The invention according to claim 4 is characterized in that at least one of the vertical drainage material 19 and the horizontal drainage material 30 is a planar drainage material. Structure.

  The invention of claim 5 is characterized in that a water shielding material 27 embedded so as to face the surface of the vertical drainage material 19 on the side of the water shielding region 17 is provided. This is the ground drainage structure described in 1.

Invention of Claim 6 is the construction method of the ground drainage structure of Claim 2,
The horizontal drainage material 30 is embedded between the water shielding area 17 and the lower area 29, and then the vertical drainage material 19 is embedded between the water shielding area 17 and the external area 18 from above. It is the construction method of the ground drainage structure characterized by this.

Invention of Claim 7 is the construction method of the ground drainage structure of Claim 1,
The vertical drainage material 19 is formed by a plurality of drainage blocks 20 in the vertical direction, and the first drainage block 20 which is the lowest stage of the drainage blocks 20 is installed vertically, and the upper end of the drainage block 20 The embankment 10 is installed in each of the water-impervious area 17 and the outer area 18 so as to be approximately the same height as the above, and then the second drainage block 20 is installed vertically on the first drainage block 20. Then, the opposing edge portions of the drainage blocks 20 and 20 are connected to each other, and the embankment is formed in the water shielding area 17 and the outer area 18 so as to be substantially the same height as the upper end of the second drainage block 20. 10 is repeated, and the installation of the drainage block 20 and the embankment 10 is repeated until the upper end of the embankment 10 reaches a desired height. Which is a method of constructing the soil drainage structure characterized.

  The invention of claim 8 is characterized in that at least one of the vertical drainage material 19 and the horizontal drainage material 30 is constituted by pipe-shaped drainage material 33 arranged in parallel with each other, or 3. The ground drainage structure according to 3.

  In addition, in this section, the reference numerals and drawing numbers appended to the above terms are not intended to limit the technical scope of the present invention to the “Example” section and the contents of the drawings described later.

  The effects of the present invention are as follows.

The invention of claim 1 is provided with a vertical drainage material that is embedded between a water-impervious region that is intended to impede water in the ground and an external region that is adjacent to the water-impervious region in the horizontal direction and extends in the vertical direction. The water flowing through the ground so as to go from the external area to the impermeable area is collected inside the vertical drainage material and flows down, and the water is discharged toward the outside of the impermeable area. In the ground drainage structure
The vertical drainage material is a formed product formed in a predetermined shape in advance.

  For this reason, the following “basic effect” occurs.

  That is, the water flowing through the ground from the external area to the impermeable area is promoted to the outside of the impermeable area by the vertical drainage material, so that the water penetrates into the impermeable area. Doing so is prevented. Therefore, since the water permeation to the impermeable area is more reliably prevented, it is prevented that the intensity of the impermeable area such as embankment decreases due to the water permeation and the collapse such as a landslide occurs. Collapses such as landslides of the foundation ground supporting this impermeable area are also prevented.

  As described above, since the vertical drainage material is an artificially formed product, the following first to third “specific effects” are produced.

  That is, first, it is easy to make the porosity and the thickness dimension of each part of the vertical drainage material uniform. Therefore, the water collected in each part of the vertical drainage material and the water flow performance after the water collection can be made uniform, and the water can be drained. Penetration can be prevented more reliably.

  Secondly, the specifications of the vertical drainage material itself are determined so that the prevention of water penetration into each part of the above-described water-impervious region is not excessive, or a plurality of vertical drainage materials are prepared. It is also possible to easily install the facing drainage material at predetermined intervals in the horizontal direction and / or the vertical direction. And if it does in this way, the said water shielding area | region can be made into the optimal moisture-containing state as much as possible, and this water shielding area | region can be hold | maintained to preferable intensity | strength.

  Thirdly, since the vertically oriented drainage material can be formed in a desired size and weight in advance, it can be handled easily. Therefore, the construction of the ground drainage structure using this vertically oriented drainage material can be made easily and inexpensively with high accuracy.

  The invention according to claim 2 is provided with a lateral drainage material which is embedded between a lower region constituting a part of the ground and the impermeable region adjacent to the lower side of the impermeable region, The lower part of the vertical drainage material communicates with the external region side that is one end side, while the other end side extends in a direction away from the vertical drainage material in the horizontal direction or obliquely downward, and the vertical orientation The water flowing down the drainage material flows from the one side to the other side of the sideways drainage material so that the water is drained toward the outside of the impermeable region. The product is formed into a shape.

  For this reason, the water collected and flowed down by the vertical drainage material is drained by the horizontal drainage material, which is an artificially formed product.

  Therefore, according to the horizontal drainage material, the same effects as the “basic effect” and “specific effect” of the vertical drainage material are produced.

  According to a third aspect of the present invention, the water shielding area is formed by embankment, and the upper surface of the lower area is an inclined surface inclined downward in a direction from the external area toward the water shielding area.

  Here, for example, a portion of the slope portion of the natural ground is cut, and the cut generated thereby causes the slope portion of the slope portion to be inclined on the upper surface of the other portion of the slope portion positioned below the portion. Forming the embankment is a convenient embankment construction method that is commonly used.

  And if the embankment of the said invention is comprised by the cut as mentioned above, since this cut is not a thing selected separately but a local generation | occurrence | production soil, its upstream by low water permeability. There is a possibility that the water level will be raised by stopping the water on the side, or that the water permeation may be facilitated by high water permeability. Moreover, this embankment is formed on an inclined surface as described above and is unstable. Therefore, in the embankment by the above cut, there is a risk that the embankment will collapse due to landslide, and in turn, the lower area which is the foundation ground supporting this embankment will cause collapse due to landslide. .

  However, even if the impermeable area is embankment by the embankment construction method, according to the longitudinal drainage material and the lateral drainage material, water from the external area to the impermeable area is more reliably collected. Since drainage is promoted, the occurrence of the above inconvenience is prevented.

  According to a fourth aspect of the present invention, at least one of the vertical drainage material and the horizontal drainage material is a planar drainage material.

  For this reason, since the surface area of the vertical drainage material and the horizontal drainage material can be increased, water collection and drainage from the external area to the water-impervious area is performed more effectively. "Effects" and "specific effects" are encouraged.

  According to a fifth aspect of the present invention, there is provided a water shielding material embedded so as to face the surface of the vertical drainage material on the side of the water shielding region.

  For this reason, water shielding from the external region to the water shielding region is more reliably performed, and the above-described “basic effect” and “specific effect” are promoted.

Invention of Claim 6 is the construction method of the ground drainage structure of Claim 2,
After the horizontal drainage material is embedded between the water shielding region and the lower region, the vertical drainage material is embedded between the water shielding region and the external region from above.

  For this reason, since the said vertical drainage material can be installed after installing the said water-impervious area | region and an external area | region, these operations can be made separate, avoiding mutual interference of these both installation operations. Therefore, the construction can be facilitated.

Invention of Claim 7 is the construction method of the ground drainage structure of Claim 1,
The vertical drainage material is formed by a plurality of drainage blocks in the vertical direction, and the first drainage block, which is the lowest of these drainage blocks, is installed vertically, and has the same height as the upper end of the drainage block. The embankment is installed in each of the water shielding area and the external area, and then the second drainage block is installed vertically on the first drainage block. The sections are connected to each other, and embankments are installed in the water shielding area and the outer area so as to be approximately the same height as the upper end of the second stage drainage block, and thereafter, the installation of the drainage block and the embankment is repeated. Then, the installation of the drainage block and the embankment is repeated until the upper end of the embankment reaches a desired height.

  For this reason, when installing the drainage block vertically and installing embankments in the water-impervious area and the outer area, respectively, it is possible to perform embankment installation work in both areas simultaneously. The drainage block can be held in the vertical orientation by the both embankments installed. Therefore, the construction method can be achieved reasonably and quickly.

  According to an eighth aspect of the present invention, at least one of the vertical drainage material and the horizontal drainage material is constituted by pipe-shaped drainage materials arranged in parallel with each other.

  Here, according to the pipe-shaped drainage material, a large strength can be maintained against the earth pressure from the outside in the radial direction, and the inner hole can be easily held in a predetermined shape. Therefore, the vertical drainage material and the lateral drainage material constituted by the pipe-shaped drainage material can keep the performance of water collection and drainage well.

  Moreover, the above-described pipe-shaped drainage material can easily increase the cross-sectional area while maintaining the desired strength. For this reason, this pipe-shaped drainage material can have a larger cross-sectional area for collecting and draining water compared to a planar drainage material, thereby further promoting the water collection and drainage. it can.

  With respect to the ground drainage structure of the present invention, it is possible to more reliably prevent water from penetrating from an external region outside the water-impervious region intended to impede water on the ground such as embankment, and to prevent the above-described impediments such as embankment. In addition to this, the foundation ground supporting this impermeable area should be prevented from collapsing more reliably, such as landslides due to water permeability, and even if this is done, construction of the ground drainage structure is easy. The best mode for carrying out the present invention is as follows in order to realize the object of enabling the cost reduction.

  That is, there is provided a vertical drainage material that is embedded between a water-impervious region that is intended to impede water in the ground and an external region that is adjacent to the water-impervious region in the horizontal direction and extends in the vertical direction. Further, the water flowing in the ground from the outer area to the impermeable area is collected inside the vertical drainage material and flows down, and the water is discharged toward the outside of the impermeable area. I have to. The vertically oriented drainage material is a formed product formed in a predetermined shape in advance.

  In order to describe the present invention in more detail, the first embodiment will be described with reference to FIGS.

  1 and 2, reference numeral 1 is the ground, and the main body of the ground 1 corresponds to the slope portion 3 of the natural ground 2. A concave portion 5 is formed by cutting a portion 4 of the slope portion 3 of the natural mountain 2. The bottom surface 6 of the recess 5 extends substantially horizontally, and the wall surface 7 on the ground mountain 2 side of the recess 5 extends substantially vertically.

  The cut 10 generated by the formation of the recess 5 in the portion 4 of the slope portion 3 causes the embankment 10 on the upper surface of the other portion 9 of the slope portion 3 adjacent to the lower side of the portion 4 in the inclination direction A of the slope portion 3. Is formed. The surface of the other portion 9 of the slope portion 3 is an inclined surface 3 a that is inclined downward in a direction from the portion 4 of the slope portion 3 toward the other portion 9. The top surface of the embankment 10 is substantially flush with the bottom surface 6 of the recess 5 and is continuously provided to the bottom surface 6, and the side surface of the embankment 10 opposite to the natural ground 2 extends substantially vertically.

  A retaining wall 11 is erected on the lower end portion in the inclined direction A of the other portion 9 of the slope portion 3 along the side surface of the embankment 10. The retaining wall 11 supports the earth pressure of the bank 10, and the bank 10 is held in a predetermined shape.

  The retaining wall 11 includes a concrete wall block 13 that is stacked in a vertical direction on a foundation 12 installed on the other portion 9 of the slope portion 3 in a side sectional view (FIG. 1). These wall blocks 13 have substantially the same shape and size. Further, in the vertical direction, each of the wall blocks 13 is structured to be detachably engaged with each other, and due to this engagement, the vertically adjacent wall blocks 13 are displaced from each other in the horizontal direction. Is prevented. Of the wall blocks 13, the lowermost wall block 13 is formed with a water passage hole 13a penetrating in the thickness direction.

  As described above, the reinforcing material 14 is provided that extends in the horizontal direction from the joint position between the wall blocks 13 stacked in the vertical direction toward the natural ground 2 and is embedded in the embankment 10. . This structure is formed by a so-called reinforced earth wall method, and each of the reinforcing members 14 reinforces the embankment 10 so that the embankment 10 can be held in a predetermined shape. One end of each reinforcing member 14 is connected to the upper end of each wall block 13, and the other end extends to the vicinity of the surface of the other portion 9 of the slope portion 3.

  The reinforcing material 14 is made of a porous flexible sheet material and has water permeability. Specifically, the reinforcing material 14 is constituted by a so-called geogrid or geotextile including a fibrous net and a resin skin coated on the surface of the net. In addition, you may comprise the said reinforcing material 14 with a porous nonwoven fabric or a metal reinforcing material.

  Most of the embankment 10 on the side of the retaining wall 11 is a water-impervious area 17 that is intended to impede water on the ground 1. Between this water-impervious region 17 and the outer region 18 which is the other part of the embankment 10 adjacent to the water-impervious region 17 in the horizontal direction, a planar vertical drainage 19 (specifically, vertically extending). , A plate-shaped) vertical drainage material 19 is embedded. The vertically oriented drainage material 19 extends substantially vertically.

  The vertically oriented drainage material 19 is an artificially formed product previously formed in a predetermined shape. This vertically oriented drainage material 19 is provided with a drainage block 20 that constitutes a plurality of drainage blocks 20 stacked in the vertical direction in a side sectional view (FIG. 1). Each of these drainage blocks 20 has a rectangular plate shape that is horizontally long and vertically oriented, and has the same shape and size. The height dimension of each drainage block 20 is substantially the same as the height dimension of each wall block 13 of the retaining wall 11, and each drainage block 20 is interposed between both reinforcing members 14, 14 adjacent in the vertical direction. Has been placed.

  Each drainage block 20 includes a horizontally long and vertically oriented rectangular core plate material 23, a plurality of strip-like ridges 24 that integrally protrude from each surface of the core plate material 23 and extend in the vertical direction, and these core plate materials. 23 and a bag-shaped water-permeable cover body 25 that integrally covers the ridge body 24.

  The protrusions 24 are arranged at equal intervals in the surface direction and in the horizontal direction of the core plate member 23, and drainage grooves 26 extending in the vertical direction are formed between the adjacent protrusions 24, 24. Further, the core plate material 23 is not formed with water passage holes, or only a few water passage holes are formed, and the water impervious material 27 is not water permeable. The cover body 25 prevents the drainage groove 26 from being blocked by earth and sand from the outside of the vertical drainage material 19.

  The core plate member 23 and the protrusions 24 are made of resin such as polypropylene, and have sufficient rigidity and strength to resist external forces such as earth pressure applied to the drainage block 20 from the periphery thereof. The cover body 25 is made of a resin such as polypropylene and is made of a long-fiber nonwoven fabric and has sufficient water permeability.

  A lateral drainage material 30 is embedded between the lower area 29 constituting a part of the ground 1 and the impermeable area 17 adjacent to the lower area of the impermeable area 17 and the outer area 18. The lower portion of the vertical drainage material 19 communicates with the external region 18 side, which is one end portion side of the lateral drainage material 30, and the other end side is away from the vertical drainage material 19 in the inclined direction A. It extends to.

  Specifically, the lower region 29 corresponds to the other portion 9 of the slope portion 3 of the natural ground 2, and the water shielding region 17 and the outer region 18 correspond to the embankment 10. Further, the horizontal drainage material 30 is an artificially formed product formed in a predetermined shape in advance, and has a structure in which the drainage blocks 20 of the vertical drainage material 19 are integrally coupled to each other. The lateral drainage material 30 is embedded between the lower region 29 (the inclined surface 3a of the inclined portion 3) and the lower surface of the embankment 10 so that each drainage groove 26 extends in the inclined direction A.

  When the water W flows in the ground so as to go from the part 4 of the slope portion 3 of the natural ground 2 or the external region 18 to the water-impervious region 17 such as when it rains, the water W The water passes through the cover body 25 and is collected in each drainage groove 26 on the external region 18 side, and is caused to flow down by its own weight. Further, the water W that has reached the lower end portion of the vertically oriented drainage material 19 through this flow passes through the cover body 25 of the laterally oriented drainage material 30 and is collected in each drainage groove 26 on the upper surface side, and its own weight. Is caused to flow downward in the inclination direction A. In addition, the water W that has reached the lower end of the laterally facing drainage material 30 by this flow passes through the water passage hole 13 a and is drained to the outside of the retaining wall 11.

  Further, the water-impervious material 27 that is the core plate member 23 of the vertically oriented drainage material 19 is more reliably prevented from entering the water-impervious region 17 from the external region 18. Further, when there is water permeation of water W from the upper surface or the like with respect to the water shielding area 17, the water W permeates the cover body 25 of the lateral drainage material 30 to each of the water shielding area 17 side. Water is collected in the drainage groove 26 and is caused to flow down by its own weight. Further, the water W that has reached the lower end portion of the vertical drainage material 19 by this flow is collected by the horizontal drainage material 30 and drained downward in the inclination direction A as described above. .

  Therefore, the water permeation to the water shielding area 17 is more reliably prevented. For this reason, it is prevented that this water permeability reduces the strength of the water-impervious region 17 and causes collapse such as landslide. In addition, since the said water-impervious area | region 17 obtains preferable intensity | strength in a moderately moist state, ie, an optimal moisture content ratio state, each specification of the said vertical drainage material 19 and the horizontal drainage material 30 so that it may be in this state as much as possible. Is determined.

  In FIG. 1, the construction method of the baseboard drainage structure will be described.

  First, the horizontal drainage material 30 is laid on the upper surface of the lower region 29, and the wall block 13 that is the first stage (lowermost stage) of the retaining wall 11 is stacked on the foundation 12. Next, the embankment 10 as the first layer is installed on the upper surface of the laterally facing drainage material 30 until it becomes substantially the same height at the upper end of the first-stage wall block 13, and at this time, it is compacted with a roller or the like. . Next, one end of the reinforcing member 14 is connected to the upper end of the first-stage wall block 13, and the other end of the reinforcing member 14 is laid on the upper surface of the first-layer embankment 10.

  Next, the above construction is repeated, and if the upper end of the n-th stage wall block 13 and the upper end of the n-th layer embankment 10 that are substantially the same height reach the lower end of the external region 18, then, The n + 1-th wall block 13 is stacked on the n-th wall block 13, and the first-stage drain block 20, which is the lowest of the drain blocks 20, is connected to the water shielding area 17 and the external area 18. It is installed vertically on the lower area 29. At this time, the upper ends of the (n + 1) -th stage wall block 13 and the first-stage drain block 20 are substantially the same height.

  Next, the horizontal drainage material 30 on the n-th layer embankment 10 and on the external region 18 side until the heights of the upper ends of the (n + 1) th stage wall block 13 and the first stage drainage block 20 are substantially the same. The embankment 10 is installed on the upper surface of the steel plate, and at this time, it is compacted with rollers or the like. Next, one end of the reinforcing member 14 is connected to the upper end of the (n + 1) th stage wall block 13, and the other end of the reinforcing member 14 is connected to the upper surface of the n + 1 layer embankment 10 in the water shielding region 17 and the above. It is laid on the upper surface of the first level embankment 10 in the outer region 18. Next, if the construction is repeated, the construction of the ground drainage structure is completed.

  The opposing end portions of the drainage blocks 20 and 20 adjacent in the vertical direction are connected to each other via the reinforcing member 14 or directly by a connecting tool such as a connecting string.

  In addition, although the above is based on the example of illustration, the material of each above-mentioned member is not limited to this. The ground 1 includes earth structures such as reinforced earth walls in addition to the natural ground 2 and the embankment 10. Further, the retaining wall 11 may have an integrated structure in which the wall blocks 13 are integrated, or may be constituted by a metal plate such as a sheet pile.

  Further, the vertical drainage material 19 may have an integrated structure in which the drainage blocks 20 are integrated, or the protruding body 24 may be projected only on the surface of the core plate material 23 on the outer region 18 side. Good. Further, the vertical drainage material 19 may be intermittently arranged at a predetermined pitch in the width direction of the water shielding region 17 as a long material such as a strip shape long in the vertical direction. The vertical drainage 19 may be slightly inclined.

  Further, the lateral drainage material 30 may be intermittently arranged at a predetermined pitch in the width direction of the water shielding region 17 as a long material such as a strip shape long in the inclination direction A. Further, the vertical drainage 19 may be arranged to extend horizontally.

  The vertical drainage material 19 and the horizontal drainage material 30 may be flexible long materials that can be wound and stored in a roll shape.

According to the above configuration, the vertical drainage material is embedded between the water-impervious region 17 that is intended to impede water in the ground 1 and the outer region 18 that is adjacent to the water-impervious region 17 in the horizontal direction and extends in the vertical direction. 19 is provided, and water W flowing in the ground so as to go from the external region 18 toward the water-impervious region 17 is collected and flows down inside the vertically drainage material 19, and this water W is flown down into the water-impervious region 17. In the ground drainage structure that is drained to the outside of the
The vertically oriented drainage material 19 is a formed product formed in a predetermined shape in advance.

  For this reason, the following “basic effect” occurs.

  That is, the water W flowing in the ground from the external region 18 toward the water-impervious region 17 is promoted to the outside of the water-impervious region 17 by the vertical drainage material 19. It is prevented from penetrating into the water shielding area 17. Therefore, since the water permeation to the water-impervious area 17 is more surely prevented, it is prevented that the water-impervious area 17 such as embankment reduces the strength of the water-impervious area 17 and collapses due to landslides. Thus, collapse of the foundation ground supporting the water-impervious region 17 such as landslide is also prevented.

  As described above, since the vertical drainage 19 is an artificially formed product, the following first to third “specific effects” are produced.

  That is, first, it is possible to easily make the porosity and the thickness dimension of each part of the vertically oriented drainage material 19 uniform. Therefore, since the water collection in each part of this vertical drainage material 19 and the flow-down performance of the water W after this water collection can be made uniform, this water W can be drained. It is possible to more reliably prevent water W from penetrating into the water.

  Second, the specification of the vertical drainage material 19 itself is set so that the prevention of the penetration of the water W into each part of the above-described water-impervious region 17 is not excessive, or a plurality of vertical drainage materials 19 are prepared. Thus, it is possible to easily install these vertically oriented drainage materials 19 at predetermined intervals in the horizontal direction and / or the vertical direction. And if it does in this way, the said water-impervious area | region 17 can be made into the optimal moisture-containing state as much as possible, and this water-impervious area | region 17 can be hold | maintained to preferable intensity | strength.

  Thirdly, since the vertical drainage material 19 can be formed in a desired size and weight in advance, it can be handled easily. Therefore, the construction of the ground drainage structure using the vertical drainage material 19 can be performed easily and inexpensively with high accuracy.

  Further, as described above, a lateral drainage material 30 embedded between the lower region 29 that constitutes a part of the ground 1 adjacent to the lower side of the water shielding region 17 and the water shielding region 17 is provided, The lower portion of the vertical drainage material 19 communicates with the external region 18 side, which is one end side of the lateral drainage material 30, while the other end portion is directed horizontally or obliquely downward from the vertical drainage material 19. The water that extends in the direction away from the vertical drainage material 19 flows from the one end side to the other end side of the horizontal drainage material 30, and the water W is drained toward the outside of the impermeable region 17. In this way, the lateral drainage material 30 is formed in advance in a predetermined shape.

  For this reason, the water W collected and flowed down by the vertical drainage material 19 is drained by the lateral drainage material 30 which is an artificially formed product.

  Therefore, according to the horizontal drainage material 30, the same effects as the “basic effect” and “specific effect” of the vertical drainage material 19 are produced.

  Further, as described above, the water shielding area 17 is formed by the embankment 10, and the upper surface of the lower area 29 is an inclined surface 3a inclined downward in the direction from the external area 18 toward the water shielding area 17.

  Here, for example, a portion of the slope portion of the natural ground is cut, and the cut generated thereby causes the slope portion of the slope portion to be inclined on the upper surface of the other portion of the slope portion positioned below the portion. Forming the embankment is a convenient embankment construction method that is commonly used.

  And if the embankment 10 of the said structure is what was comprised by the cut as mentioned above, since this cut is not the thing selected separately but a local generation | occurrence | production soil, its low water permeability There is a possibility that the upstream side will be stopped and the water level will be raised, or that the water will be easily permeable due to high water permeability. Moreover, the embankment 10 is formed on the inclined surface 3a as described above and is unstable. Therefore, in the embankment 10 by the above-mentioned cut, this embankment 10 is collapsed due to landslide, and further, the lower region 29 that is the basic ground supporting the embankment 10 is collapsed due to landslide, and thus inconvenience occurs. There is a risk.

  However, even if the impermeable region 17 is embankment by the embankment construction method, according to the longitudinal drainage material 19 and the lateral drainage material 30, the water W from the external region 18 to the impermeable region 17 is more Since the water is reliably collected and drainage is promoted, the above-mentioned inconvenience is prevented.

  Further, as described above, at least one of the vertical drainage material 19 and the horizontal drainage material 30 is a planar drainage material.

  For this reason, since the surface area of the vertical drainage material 19 and the horizontal drainage material 30 can be increased, water W collection and drainage from the external region 18 toward the water shielding region 17 is performed more effectively. The aforementioned “basic effects” and “specific effects” are promoted.

  Moreover, as described above, the water shielding material 27 embedded so as to face the surface on the water shielding region 17 side in the vertically oriented drainage material 19 is provided.

  For this reason, the water W is more reliably shielded from the external region 18 toward the water-impervious region 17, and the above-described “basic effect” and “specific effect” are promoted.

  In addition, as described above, in the construction method of the ground drainage structure, the vertical drainage material 19 is formed by a plurality of drainage blocks 20 in the vertical direction, and the first stage which is the lowest stage of these drainage blocks 20 The drainage block 20 is installed vertically, and the embankment 10 is installed in each of the water shielding area 17 and the external area 18 so as to be almost the same height as the upper end of the drainage block 20, and then the first stage A second-stage drain block 20 is installed vertically on the drain block 20, the opposing edges of both drain blocks 20, 20 are connected to each other, and are substantially the same as the upper end of the second-stage drain block 20. The embankment 10 is installed in each of the water-impervious area 17 and the outer area 18 so that the height becomes higher, and thereafter, the installation of the drainage block 20 and the embankment 10 is repeated until the upper end of the embankment 10 reaches a desired height. , And repeated installation of the drainage block 20 and fill 10.

  Therefore, when the drainage block 20 is installed vertically and the embankment 10 is installed in each of the water-impervious area 17 and the outer area 18, the embankment 10 is installed in both the areas 17 and 18 at the same time. The drainage block 20 can be held in the vertical orientation by the both embankments 10 installed in both the regions 17 and 18. Therefore, the construction method can be achieved reasonably and quickly.

  Further, in the construction method of the ground drainage structure, the horizontal drainage material 30 is embedded between the water-impervious region 17 and the lower region 29, and then between the water-impervious region 17 and the outer region 18. The vertical drainage material 19 may be embedded. In this case, the vertical drainage material 19 may be embedded using a driving machine 39 that drives a sheet pile.

  According to the above configuration, since the vertical drainage material 19 can be installed after the water-impervious region 17 and the external region 18 are installed, these operations can be separated from each other, avoiding mutual interference. Can do. Therefore, the construction can be facilitated.

  3 and 4 below show the second embodiment. The second embodiment is common in many respects to the configuration and operational effects of the first embodiment. Therefore, regarding these common items, common reference numerals are attached to the drawings, and redundant description thereof is omitted, and different points are mainly described. In addition, the configuration of each part in these embodiments may be variously combined in light of the object and operational effects of the present invention.

  In order to explain the present invention in more detail, the second embodiment will be described with reference to FIGS.

  3 and 4, the vertically oriented drainage material 19 is composed of a large number of pipe-shaped drainage materials 33 arranged at a predetermined pitch in the width direction of the water-impervious region 17. The pipe-shaped drainage material 33 is a resin circular pipe made of high-density polyethylene, and has rigidity in the external force from the radial direction, but has flexibility as a whole.

  The pipe-shaped drainage material 33 is a thin wall formed integrally with the skeleton wire 34 so as to close a gap between the skeleton wire 34 extending in a spiral shape and the skeleton wire 34 in the axial direction of the pipe-shaped drainage 33. A pipe member 35. The pipe material 35 has a large number of minute diameter water holes 36 formed therein.

  The lateral drainage material 30 may also be constituted by the pipe-shaped drainage material 33.

  According to the pipe-shaped drainage material 33, a large strength can be maintained against the earth pressure from the outside in the radial direction, and the inner hole can be easily held in a predetermined shape. Therefore, the vertical drainage material 19 and the lateral drainage material 30 constituted by the pipe-shaped drainage material 33 can maintain the performance of water collection and drainage well.

  Moreover, the above-described pipe-shaped drainage material 33 can easily increase the cross-sectional area while maintaining a desired strength. For this reason, this pipe-shaped drainage material 33 can make cross-sectional area for water collection and drainage larger compared with a planar drainage material, and thereby promote these water collection and drainage more. Can do.

  In the construction method of the ground drainage structure, the pipe-shaped drainage material 33 constituting the vertical drainage material 19 is embedded between the impermeable region 17 and the external region 18 by the driving machine 39 as follows.

  That is, the driving machine 39 includes a casing pipe 40 that can be moved up and down. The pipe-shaped drainage material 33 is inserted into the casing pipe 40. A tip anchor 41 is attached to the lower end of the pipe-shaped drainage material 33, and the tip anchor 41 is brought into contact with the lower surface of the casing pipe 40.

  The casing pipe 40 is driven between the water-impervious region 17 and the external region 18 while pushing the tip anchor 41 until the lower end of the pipe-shaped drainage material 33 reaches the lateral drainage material 30 ( In FIG. 3, the pipe-shaped drainage material 33 is shown by a solid line, and the casing pipe 40 is shown by a two-dot chain line). Next, only the casing pipe 40 is raised, leaving the pipe-shaped drainage material 33 and the tip anchor 41 (the chain line in FIG. 3). Thereby, embedding of the pipe-shaped drainage material 33 is completed.

Example 1 is shown, and is a side sectional view of the ground. 1 is a partial perspective partial cutaway view of a vertically oriented drainage material and a laterally oriented drainage material, showing Example 1. FIG. FIG. 2 shows a second embodiment and corresponds to FIG. FIG. 2 is a view of a pipe-shaped drainage material according to a second embodiment, wherein (1) is a partial side view, and (2) is a cross-sectional view taken along line II-II in (1).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground 2 Ground mountain 3 Slope part 3a Inclined surface 4 Part 9 Other part 10 Embankment 11 Retaining wall 13 Wall block 13a Water flow hole 14 Reinforcement material 17 Impermeable area 18 External area 19 Vertical drainage material 20 Drain block 23 Core board material 24 Projection body 25 Cover body 26 Drainage groove 27 Water shielding material 29 Lower region 30 Horizontal drainage material 33 Pipe-shaped drainage material A Inclination direction W Water

Claims (8)

A vertical drainage material that is embedded between a water-impervious region that is intended to impede water in the ground and an external region that is adjacent to the water-impervious region in the horizontal direction and that extends in the vertical direction is provided. In the ground drainage structure in which water flowing in the ground toward the area is collected and flowed down inside the vertically oriented drainage material, and this water is drained toward the outside of the impermeable area,
The ground drainage structure, wherein the vertically oriented drainage material is a formed product formed in a predetermined shape in advance.   A lateral drainage material embedded between a lower region constituting a part of the ground adjacent to the lower side of the impermeable region and the impermeable region is provided, and the outer side that is one end side of the lateral drainage material The lower side of the vertical drainage material communicates with the region side, while the other end extends horizontally or obliquely downward, away from the vertical drainage material, and the water flowing down the vertical drainage material is The horizontal drainage material flows from one end side to the other end side so that the water is drained toward the outside of the impermeable region, and the horizontal drainage material is formed in a predetermined shape in advance. The ground drainage structure according to claim 1, wherein:   The ground drainage structure according to claim 2, wherein the water shielding area is formed by embankment, and the upper surface of the lower area is an inclined surface inclined downward in a direction from the external area toward the water shielding area.   The ground drainage structure according to claim 2 or 3, wherein at least one of the vertical drainage material and the horizontal drainage material is a planar drainage material.   The ground drainage structure according to any one of claims 1 to 4, further comprising a water shielding material embedded so as to face a surface on the water shielding region side in the vertically oriented drainage material. It is a construction method of the ground drainage structure according to claim 2,
After the horizontal drainage material is embedded between the impermeable region and the lower region, the vertical drainage material is embedded from above between the impermeable region and the outer region. Drainage construction method. It is a construction method of the ground drainage structure according to claim 1,
The vertical drainage material is formed by a plurality of drainage blocks in the vertical direction, and the first drainage block, which is the lowest of these drainage blocks, is installed vertically, and has the same height as the upper end of the drainage block. The embankment is installed in each of the water shielding area and the external area, and then the second drainage block is installed vertically on the first drainage block. The sections are connected to each other, and embankments are installed in the water shielding area and the outer area so as to be approximately the same height as the upper end of the second stage drainage block, and thereafter, the installation of the drainage block and the embankment is repeated. And the construction method of the ground drainage structure characterized by repeating installation of the said drainage block and embankment until the upper end of embankment becomes desired height.   The ground drainage structure according to claim 2 or 3, wherein at least one of the vertically oriented drainage material and the laterally oriented drainage material is constituted by pipe-shaped drainage materials arranged in parallel with each other.

Images