JP2022084334A - Drainage structure for valley terrain and culvert block - Google Patents

Abstract

To provide a drainage structure for valley terrain and a culvert block allowing a valley bottom in valley terrain and an inclined place adjacent to the valley bottom to be strongly protected while keeping good drainage in the valley bottom in the valley terrain.SOLUTION: A drainage structure 1A for valley terrain is provided with slopes formed adjacent to a valley bottom 30b and a culvert 32 in the valley bottom 30b in valley terrain 30. The culvert 32 is provided with culvert blocks 2 and a group of solid materials 12 placed outside of side walls 3 of the culvert blocks 2. The slopes are provided with slope blocks 8 and a group of solid materials 12 placed on the side of rear surfaces 9b of the slope blocks 8. The culvert blocks 2 are provided with support surfaces 7 formed along vertical upper edges 3 of the side walls 3, and the slope blocks 8 are sealed in the support surfaces 7 of the culvert blocks 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a drainage structure for valley topography and an underdrain block for that purpose, which can efficiently drain water from the valley bottom while protecting the valley bottom side of the inclined surface forming the valley topography.

In recent years, with the global warming, unexpected rainfall such as torrential rain and guerrilla rainstorm has frequently occurred in a short time.
When the amount of rainfall generated in a short period of time is larger than that in normal times, the infiltration of rainwater into the soil cannot catch up and the rainwater flows on or in the topsoil. As a result, slope collapse and debris flow are likely to occur, especially in valley topography.
The following are known as prior applications for dealing with such problems.

Patent Document 1 has the name "Drainage facility construction method on a slope with strong weathering tendency and a waterway block used for the method", and the drainage facility is safe on a soil with strong weathering, especially on a slope with weathered soft rock. The invention relating to the method of constructing the soil and the waterway block used in the method is disclosed.
The waterway block, which is the invention disclosed in Patent Document 1, will be described by using the reference numerals shown in FIG. 1 in the same document as they are. In the state of being vertically installed at the boundary portion (2c) with the upper slope (1a) of the small step (1c) on the upper surface (2) which becomes lower from the valley side (2b) to the mountain side (2a), the small step upper surface (2c). It is characterized by having a flat concave cross section in which the valley-side edge (4b) of the opening (4) is arranged in 2).
According to the waterway block disclosed in Patent Document 1 having the above configuration, a column is formed at the boundary portion of the small step provided in the middle of the slope in the height direction with the upper slope of the small step on the upper surface lowering from the valley side to the mountain side. In the installed state, it has a flat concave cross section in which the valley-side edge of the opening is arranged on the upper surface of the step. Therefore, according to the invention disclosed in Patent Document 1, a drainage channel can be laid without digging deeply into the boundary portion of the upper surface of the small step with the upper slope. Therefore, the drainage facility can be safely installed without making the upper slope unstable. Moreover, according to the invention disclosed in Patent Document 1, it is relatively easy to join the canal blocks in a watertight manner, and if the canal blocks are joined in a watertight manner, the seam can be connected to the ground. There is no risk of water infiltration. Further, according to the invention disclosed in Patent Document 1, the laid drainage channel has a long groove having a flat concave cross section, and this groove functions as a normal water passage portion, so that the drainage channel is inclined to the upper surface of the small step. Compared with the case where the obtuse-angled boundary formed by the upper slope is used as the water passage part, its drainage and water flow performance is significantly superior.

Patent Document 2 discloses an invention relating to a retaining wall structure capable of preventing the outflow of the foundation ground and reducing the stress level and maintaining the stability of the foundation ground and the back ground under the name of "box-shaped retaining wall". There is.
The box-shaped retaining wall disclosed in Patent Document 2 will be described by using the reference numerals shown in FIG. 1 in the same document as they are. Each step z1 and z2 includes a plurality of box-shaped retaining wall blocks 1 including a surface plate 2, a rear retaining plate 3, and connecting plates 4 and 4 connecting them to the left and right in front of the slope 10. It is constructed by arranging them side by side and filling the spaces 6, 7, and 8 between the surface plate 2 and the slope 10 with the filled stone material 19. Under the box-shaped retaining wall block 1 at the bottom z1, it extends to the left and right, and the water storage capacity per 1 m of left and right length is 0.4 to 4 m ³ , and water enters the water tank from the upper surface of the water tank. It is characterized in that a water tank 14 is provided so that the earth and sand of the surrounding ground 11 does not substantially enter the water tank.
According to the invention disclosed in Patent Document 2 having the above configuration, even if an unexpected rainfall occurs in a short time due to a guerrilla rainstorm or the like, a predetermined amount or more of rainwater or spring water is temporarily discharged under the box-shaped retaining wall. By storing water, it is possible to prevent the outflow of the foundation ground and the decrease in stress level, and to maintain the stability of the foundation ground and the back ground.

Patent Document 3 discloses an invention relating to a slope protection block with a drainage ditch, which can be installed and constructed in a good manner on a slope of any angle under the name of "slope protection block with a drainage ditch". ing.
The invention disclosed in Patent Document 3 will be described by using the reference numerals shown in FIG. 3 in the same document as they are. It is composed of a wall surface block 2 that is installed alongside and covers the slope A, and a connecting structure 3 that connects the lower end portion of the wall surface block 2 to the side end portion of the drainage groove block 1 is connected to the lower end portion of the wall surface block 2. And one or both of the side ends of the drainage groove block 1, and the connection structure 3 is characterized in that the connection angle of the wall surface block 2 can be adjusted and changed with respect to the drainage groove block 1. Is to be.
According to the invention disclosed in Patent Document 3 having the above configuration, the wall surface block for slope protection and the drainage ditch block are configured to be connected to each other, and the wall surface block and the drainage ditch block are integrated into the slope. By making it possible to install and fix, and by making it possible to connect the wall block to the drainage ditch block so that the angle can be adjusted and changed, it can be installed and installed well on slopes of any angle. It plays the effect.

The inventor of the present application has previously filed JP-A-2020-94461 (Patent Document 4) and JP-A-2018-21342 (Patent Document 5) as prior applications related to the present invention, both of which have been patented. There is.

Japanese Unexamined Patent Publication No. 2008-291487 Japanese Unexamined Patent Publication No. 2019-13209 Japanese Unexamined Patent Publication No. 2001-241444 Japanese Unexamined Patent Publication No. 2020-9461 Japanese Unexamined Patent Publication No. 2018-21342

In the invention disclosed in Patent Document 1 as described above, rainwater does not permeate into the ground side from the waterway block according to the invention, or rainwater does not flow in the opposite direction.
Therefore, when a torrential rain or a guerrilla rainstorm occurs, the rainwater flowing on or in the surface layer of the ground causes scouring at the boundary between the canal block and the soil disclosed in Patent Document 1, and the block causes scouring. There is a concern that the drainage channel will collapse.

The box-shaped retaining wall block in the invention disclosed in Patent Document 2 does not have a function of draining water from the back surface side (holding plate side) to the front surface side (front surface plate side).
Therefore, in the event of torrential rain or guerrilla rainstorm, and if the rainwater collected in the water tank exceeds the capacity of the water tank, the rainwater that has lost its place will stay in the box-shaped retaining wall block, and this There is a concern that the box-shaped retaining wall block will collapse toward the surface side (face plate side) if the state continues.

In the case of the invention disclosed in Patent Document 3, as described in paragraph 0037 of the specification in the same document, the description that the outer shape of the wall surface block is a square frame and the ground is exposed from the opening in the frame. There is. Therefore, in the invention disclosed in Patent Document 3, it is considered that the case where water flows from the back surface side (inclined surface side) of the wall surface block toward the drainage ditch block side (front surface side) is also included in the concept of the invention. ..
However, in the invention disclosed in Patent Document 3, when the wall surface block is made of a square frame, vegetation is assumed to protect the ground exposed from the opening in the frame. For this reason, when the growth of this vegetation is insufficient, or when torrential rain or guerrilla rainstorm occurs during the period when the vegetation dies (for example, in winter), from the opening in the frame of the square frame constituting the wall surface block. There was a concern that soil would flow out and collect in the drainage ditch block, obstructing the flow of water in the drainage ditch block.

The present invention has been made in response to such conventional circumstances, and while maintaining good drainage at the valley bottom of the valley topography, the collapse of the slope near the valley bottom occurs when torrential rain or guerrilla heavy rain occurs. It is an object of the present invention to provide a drainage structure for valley topography and an underdrain block for it, which can be prevented and the slope can be used as a drainage structure.

The drainage structure for valley terrain, which is the first invention to achieve the above object, is a drainage structure composed of a slope formed near the valley bottom in the valley terrain and an underdrain provided at the valley bottom, and the underdrain is made of concrete. A pair of side walls made of concrete, a ceiling wall connecting the vertically upper end edges of the pair of side walls made of concrete, and a first water passage hole provided through the thickness direction of the side wall to move water in the same direction. It is equipped with an underdrain block and a group of solids composed of individual solids arranged outside the side wall of the underdrain block, and the slope is made of concrete and a flat plate forming a slope near the bottom of the valley. A method including a copy that is projected on the back side of the flat plate to fix the flat plate on the slope, and a second water passage hole that is provided through the thickness direction of the flat plate and moves water in the same direction. It comprises a face block and a group of solids consisting of individual solids arranged on the back side of the flat plate in this slope block, the underdrain block being formed along the vertically upper edge of its side wall, valley topography. The flat plate of the slope block is characterized in that it is provided with a support surface inclined toward the inclined surface of the concrete block, and is suspended from the support surface of the underdrain block.

In the first invention of the above configuration, the culvert has an action of forming a drainage channel in the ground at the bottom of the valley. Further, the pair of side walls of the underdrain block constituting this underdrain has the function of separating the soil forming the valley topography and the drainage channel newly formed in the ground at the bottom of the valley with concrete. In addition, the ceiling wall of the underdrain block becomes the valley bottom of the valley topography to be installed when the underdrain block is buried in the ground of the valley bottom. Further, the first water passage hole formed on the side wall of the underdrain block has an effect of allowing water to flow in the thickness direction of the side wall. That is, when water moves from the first water passage hole to the hollow side of the underdrain block, the first water passage hole acts as a catchment hole for collecting the soil water at the bottom of the valley in the underdrain block. Further, when water moves from the first water passage hole to the outside of the underdrain block, the first water passage hole is a drainage for allowing water flowing in the hollow portion of the underdrain block to permeate and drain into the surrounding soil. Acts as a hole. Further, when the culvert block is buried in the ground of the valley bottom in the above culvert, the solids group composed of individual solids arranged on the outside of the side wall are engaged with each other to be in the soil of the valley bottom. It acts as an anchor for fixing the underdrain block. In addition, the solids act as a filter to prevent the soil forming the valley terrain from flowing into the hollow side of the underdrain block.

Further, in the first invention, the slope protects the surface of the slope near the valley bottom of the valley topography, drains the soil water from the underground side to the surface side of the slope, and forms the valley bottom of the valley topography. It has the function of infiltrating and draining the flowing water flow from the front surface side to the back surface side (underground side) of the slope block. Further, the flat plate of the slope block constituting such an inclined surface has an effect of covering and protecting the surface of the inclined surface near the valley bottom of the valley topography. Further, the copy of the slope block has an effect of allowing the flat plate to stand on its own in a state of being inclined with respect to the vertical direction. In addition, the reserve is buried in the soil that constitutes the slope near the bottom of the valley and acts as an anchor that prevents the flat plate from separating from the slope. Further, the second water passage hole formed so as to penetrate the thickness direction of the flat plate has an action of flowing water in the thickness direction of the flat plate. That is, when water moves from the second water passage hole to the front side of the flat plate, the second water passage hole acts as a drainage hole for draining the soil water on the inclined surface forming the valley topography to the valley bottom side. .. When water moves from this second water passage hole to the back side of the flat plate, the second water passage hole allows water flowing through the valley bottom of the valley topography to permeate into the soil of the slope forming the valley topography. It acts as a drainage hole to make it. Further, on the above slope, a group of solids composed of individual solids, which is interposed between the flat plate of the slope block and the soil forming the valley terrain, cooperates with the reserve in the slope block to form the valley bottom of the valley terrain. It acts as an anchor for fixing the flat plate to the inclined surface on the side. The solid matter group also acts as a filter for preventing the soil forming the inclined surface near the valley bottom of the valley topography from flowing out to the valley bottom through the thickness direction of the flat plate.

Further, in the first invention, the support surface formed in the underdrain block is brought into contact with the flat plate of the slope block to hold the flat plate of the slope block in a state of being inclined toward the inclined surface side of the valley topography. It has the effect of.
Further, in the first invention, the vertically upper side of the underdrain block is sandwiched by a pair of slope blocks. In this case, when earth pressure that causes this slope to collapse occurs on one slope of the valley terrain, this earth pressure is indirectly applied to the other slope through the underdrain block and the other slope block. It has the function of supporting. This has the effect of suitably suppressing the collapse of the inclined surface on the valley bottom side in the valley topography.

The second invention, the drainage structure for valley terrain, is the first invention described above, wherein the underdrain block is provided with a ridge formed along the vertically upper edge of the side wall, and the support surface is the ridge. It is characterized in that it is formed on a strip or straddling a side wall and a ridge.
The second invention of the above configuration has the same action as that of the first invention described above. In addition, if the underdrain block has a pair of ridges and a support surface is formed on the ridges, or if a support surface is formed across the side wall and the ridges, the support surface will be on the side wall of the underdrain block. The area of the side wall where the first water passage hole is formed in the underdrain block is relatively large as compared with the case where only is formed. In this case, in the second invention, the contact area between the soil on the valley bottom side and the underdrain block is increased, and the water collection efficiency to the underdrain block or the drainage efficiency from the underdrain block to the surrounding soil is improved.

The third invention, the drainage structure for valley topography, is the first or second invention described above, wherein the first water passage hole is elongated in the vertical direction.
The third invention of the above configuration has the same action as that of the first or second invention described above. In addition, according to the third invention, the efficiency of collecting water from the soil on the valley bottom side to the underdrain block is improved as compared with the case where the first water passage hole has an elongated shape substantially parallel to the flow of water. Has an action.

The fourth invention, the drainage structure for valley topography, is any one of the above-mentioned first to third inventions, and is characterized in that the ceiling wall of the underdrain block does not have a through hole. be.
The fourth invention of the above configuration has the same action as the action of each of the above-mentioned first to third inventions. In addition, the fourth invention has an effect of increasing the strength of the ceiling wall as compared with the case where the ceiling wall has a through hole because the ceiling wall of the underdrain block does not have a through hole. .. That is, the strength of the underdrain block is increased when a force for compressing from the side wall side acts on the ceiling wall of the underdrain block.
As a result, it has the effect of continuing to support the slope block suspended on the support surface of the underdrain block and the soil on the back side thereof (soil buried in the slope block) in a stable state for a long period of time.

The underdrain block according to the fifth invention is an underdrain block used for the drainage structure for valley topography according to any one of the first to fourth inventions, and the underdrain block is the underdrain block according to the first invention described above. It is characterized by having the same side wall, the same ceiling wall as the culvert block, the same water passage hole as the first water passage hole formed in the culvert block, and the same support surface as the culvert block. It is something to do.
The fifth invention of the above configuration specifies the underdrain block used in the above-mentioned first to fourth inventions as an invention of a thing, and its action is the same as the action of the underdrain block in the first invention. ..

The culvert block according to the sixth invention is the fifth invention, wherein the culvert block includes a ridge formed along the vertically upper end edge of the side wall, and the support surface is a ridge or a support surface. It is characterized in that it is formed so as to straddle a side wall and a ridge.
The sixth invention of the above configuration specifies the underdrain block used in the above-mentioned second invention as an invention of a thing, and its action is the same as the action of the underdrain block in the second invention.

According to the first invention as described above, rainwater or soil water that normally flows into the valley bottom side of the valley topography can be collected in an underdrain and drained. In this case, since rainwater or the like does not directly flow through the valley bottom, erosion of the valley bottom due to running water can be prevented. As a result, it is possible to suppress the occurrence of collapse and landslide on the slope forming the valley topography.
Further, in the first invention, the ceiling wall of the underdrain block constituting the underdrain is substantially the valley bottom. As described above, in the first invention, rainwater or the like collected on the valley bottom side normally flows in the culvert (inside the hollow portion of the culvert block) and is drained. On the other hand, when there is more rainfall than expected in a short time in the vicinity of the valley bottom topography provided with the first invention, the rainwater is drained on the ceiling wall of the underdrain block as a second drainage channel. In this case, the bottom of the second drainage channel is a concrete ceiling wall, and the riverbank constituting the second drainage channel is also a slope provided with a concrete slope block. Therefore, it is possible to suitably prevent erosion and collapse of the valley bottom and the inclined surface (slope) adjacent to the valley bottom when rainwater flows through the second drainage channel.
Further, in the first invention, the vertical upper side of the underdrain block is installed on the valley bottom side of the valley topography in a state of being sandwiched by a pair of slope blocks. In this case, when earth pressure is generated to push down one of the slopes forming the valley topography from the back surface side, the earth pressure can be received and supported by the inclined surface on the other slope side. That is, according to the first invention, a structure is realized in which the slopes on the valley bottom side support each other via the underdrain block. As a result, it is possible to maintain the terrain in a stable state for a long period of time while maintaining good drainage on the valley bottom side of the valley terrain.

According to the second invention, it has the same effect as the effect of the first invention as described above. In addition, in the second invention, the efficiency of collecting water from the soil constituting the valley bottom of the valley topography is higher than that in the case of using the underdrain block in the first invention. As a result, according to the second invention, it is possible to provide a drainage structure for valley topography having better drainage property as compared with the first invention.

According to the third invention, it has the same effect as the effect of the first or second invention described above. Further, according to the third invention, the efficiency of collecting water from the soil on the valley bottom side to the underdrain block is as compared with the case where the first water passage hole is formed into an elongated shape substantially parallel to the flow of water on the side wall of the underdrain block. Will be higher.
As a result, according to the third invention, it is possible to provide a drainage structure for valley topography having better drainage from the soil on the valley bottom side.

According to the fourth invention, it has the same effect as the effect of each of the above-mentioned first to third inventions. Further, according to the fourth invention, the strength of the ceiling wall of the underdrain block is higher than that in the case where the ceiling wall has a through hole.
Therefore, by providing the valley topography with the drainage structure for valley topography according to the fourth invention, the protection effect on the valley bottom side of the valley topography is enhanced.

The fifth invention specifies the underdrain block used in each of the above-mentioned first to fourth valley topographic drainage structures as an invention of a thing. More specifically, the fifth invention is the same as the underdrain block constituting the first invention described above.
Therefore, the effect of the fifth invention is the same as the effect of the underdrain block in the first invention.

The sixth invention specifies the detailed structure of the fifth invention described above. More specifically, the sixth invention is the same as the underdrain block constituting the second invention described above.
Therefore, the effect of the sixth invention is the same as the effect of the underdrain block in the second invention.

It is sectional drawing which looked at the drainage structure for valley topography which concerns on embodiment of this invention from the direction which crosses the flow path. It is a perspective view which shows the relation of the underdrain block and the slope block in the drainage structure for valley topography which concerns on embodiment of this invention. It is a perspective view of the underdrain block in the drainage structure for valley topography which concerns on embodiment of this invention. (A) It is a perspective view which looked at the slope block in the drainage structure for valley topography which concerns on embodiment of this invention from the front side, and (b) is the perspective view which looked at the slope block from the back side. It is an image diagram which shows the use state of the drainage structure for valley topography which concerns on embodiment of this invention. (A) It is a perspective view which shows the 1st modification of the underdrain block which concerns on this invention, and (b) is is the perspective view which shows the 2nd modification of the underdrain block which concerns on this invention. It is a perspective view of the main part of the drainage structure for valley topography which concerns on this invention which comprises the underdrain block which concerns on modification 2. It is a perspective view which shows the relation of the underdrain block and the slope block in the drainage structure for valley topography which concerns on other modification of this invention. It is a perspective view which shows the connection of the underdrain block and the slope block in the drainage structure for valley topography which concerns on another modification of this invention.

The drainage structure for valley topography and the underdrain block used therein will be described in detail with reference to FIGS. 1 to 9 according to the embodiment of the present invention.

[1-1; About the basic configuration of the present invention]
First, the drainage structure 1A for valley topography according to the present embodiment will be described with reference to FIGS. 1 to 4.
FIG. 1 is a cross-sectional view of the drainage structure for valley topography according to the embodiment of the present invention as viewed from the direction crossing the flow path. Further, FIG. 2 is a perspective view showing the relationship between the underdrain block and the slope block in the drainage structure for valley topography according to the embodiment of the present invention. Further, FIG. 3 is a perspective view of an underdrain block in the drainage structure for valley topography according to the embodiment of the present invention. In addition, FIG. 4A is a perspective view of the slope block in the drainage structure for valley topography according to the embodiment of the present invention as viewed from the front side, and FIG. 4B is a perspective view of the slope block as viewed from the back side. Is.
As shown in FIG. 1, the drainage structure 1A for valley terrain according to the present embodiment is mainly a culvert 32 buried in the ground at the bottom of the valley in the valley terrain 30, and a pair of culverts 32 continuously formed in the culvert 32. It is a drainage structure composed of slopes 33 and 33.
Further, the culvert 32 in the valley topography drainage structure 1A according to the present embodiment is mainly composed of the culvert block 2 and the culvert block 2 and individual solids 12 as shown in FIG. 1, for example. It is composed of 12 groups of solids.
Further, as shown in FIGS. 1 to 3, for example, the underdrain block 2 in the valley topography drainage structure 1A according to the present embodiment has a pair of side walls 3 and 3 made of reinforced concrete and a pair of side walls 3 made of reinforced concrete. A ceiling wall 4 connecting each of the vertically upper end edges in 3 and a first water passage hole 5 provided through the thickness direction of each side wall 3 to move water in the thickness direction of the side wall 3, and a side wall. It is formed along the vertically upper edge of 3 and 3, and is provided with a support surface 7 for hooking the slope block 8 constituting the slope 33.
Further, as shown in FIGS. 1 to 3, the support surface 7 in the above-mentioned underdrain block 2 is a flat surface formed along the vertically upper end edges of the side walls 3 and 3. The support surface 7 formed in the underdrain block 2 is formed so as to incline toward the inclined surface 30a of the valley topography 30 when the underdrain block 2 is buried in the soil at the bottom of the valley (FIG. 1). reference).

Further, as shown in FIG. 1, for example, the slope 33 in the valley topography drainage structure 1A according to the present embodiment is a slope suspended on each of the support surfaces 7 and 7 formed in the above-mentioned underdrain block 2. It is composed of a block 8 and a group of solids 12 arranged on the back side of the slope block 8 and composed of individual solids 12.
Further, the slope block 8 in the valley topography drainage structure 1A according to the present embodiment is a flat plate forming the slope 33 at a position close to the valley bottom 30b of the valley topography 30, as shown in FIGS. 1, 2, and 4, for example. A second plate 9 is provided so as to project from the back surface 9b side of the flat plate 9 to fix the flat plate 9 to the slope 33, and a second plate 9 is provided so as to penetrate the thickness direction of the flat plate 9 to move water in the same direction. It is provided with a water passage hole 11.
The copy 10 of the slope block 8 acts as an anchor for fixing the flat plate 9 to the slope 33. Further, the copy 10 also has an effect of supporting the flat plate 9 so as to be able to stand on its own when forming the slope 33.

In the valley terrain drainage structure 1A according to the present embodiment as described above, the support surface 7 formed on each of the side walls 3 and 3 of the culvert block 2 is the valley terrain 30 in which the culvert block 2 is installed. Since the flat plate 9 of the slope block 8 is suspended and held by the support surface 7, the flat plate 9 of the slope block 8 is also inclined toward the inclined surface 30a of the valley terrain 30.
That is, in the valley terrain drainage structure 1A according to the present embodiment, as shown in FIG. 1, when the valley terrain drainage structure 1A is viewed from the direction blocking the flow path, the method is performed vertically upward of the underdrain block 2. The flat plates 9 of the surface block 8 are arranged in an inverted C shape.

[1-2; Installation method of the basic configuration of the present invention]
The drainage structure 1A for valley topography according to the present embodiment can be installed in valley topography 30 such as mountains by the procedure as shown below.
More specifically, a valley line (not shown) in a mountainous area or an artificially formed valley terrain 30 is excavated to form an excavation groove 31 having a pair of inner side surfaces 31a and 31a and a bottom surface 31b as shown in FIG. (Step S1).
After that, if necessary, a solid material 12 (solid material 12 group) made of, for example, crushed stone or natural stone emitted from the soil at the time of forming the excavation groove 31 is laid on the bottom surface 31b of the excavation ditch 31. An underdrain block 2 is installed on the solid matter 12 group with the ceiling wall 4 facing vertically upward (step S2). That is, the upper end edge 3a of the side wall 3 in the underdrain block 2 is arranged on the vertically upper side, and the lower end edge 3b is arranged on the bottom surface 31b of the excavation groove 31.
When a plurality of underdrain blocks 2 are used, the plurality of underdrain blocks 2 may be arranged in series on the bottom surface 31b of the excavation groove 31 while communicating the hollow portions with each other.
If the bottom surface 31b of the excavation ditch 31 is made of particularly hard ground or stratum and is not easily eroded by running water, the underdrain block 2 may be placed directly on the bottom surface 31b without laying the solid matter 12 group. good.

Then, after the step S2, for example, crushed stone or nature that comes out of the soil when the excavation groove 31 is formed on the outside of the side walls 3 and 3 of the underdrain block 2 arranged on the bottom surface 31b of the excavation groove 31. A solid substance 12 (solid substance 12 group) made of stone or the like is arranged (step S3).
At this time, the solid material 12 arranged adjacent to the first water passage hole 5 formed in the side wall 3 needs to have a size that does not pass through the first water passage hole 5.
Further, after the step S3, a part of the soil generated when the excavation ditch 31 is formed is disposed on the outside of the side wall 3 of the underdrain block 2, and the solid matter 12 group and the inner side surface 31a of the excavation ditch 31. By returning it as buried soil 13a during the period, the installation work of the underdrain block 2 in the excavation ditch 31 is completed (step S4).
At this time, the support surface 7 provided on the vertically upper side of the underdrain block 2 buried in the excavation ditch 31 needs to be exposed without being buried in the buried soil 13a and the solid matter 12 group.
In addition, the upper surface of the buried soil 13a on the outside of the underdrain block 2 buried in the excavation ditch 31 may be flattened so that the slope block 8 can be installed in the subsequent steps.
The steps S1 to S4 are the steps of forming the underdrain 32 in the drainage structure 1A for valley topography according to the present embodiment.

Further, the step following the step S4 is a step of forming the slope 33 on the underdrain block 2 by using the slope block 8.
More specifically, after the previous step S4, the slope block 8 is placed on the buried soil 13a backfilled between the underdrain block 2 and the inner side surface 31a of the excavation ditch 31. At this time, by hooking the flat plate 9 of the slope block 8 to the support surface 7 of the underdrain block 2 exposed from the buried soil 13a and the solid matter 12 group, more specifically, the flat plate 9 in the slope block 8 is hooked. By hooking the front surface 9a of the above to the support surface 7, the underdrain block 2 and the slope block 8 can be linked (step S5).
In this case, the plane direction of the support surface 7 of the underdrain block 2 and the plane direction of the flat plate 9 (front surface 9a) of the slope block 8 suspended on the support surface 7 are parallel (including the concept of substantially parallel). ..
That is, when the drainage structure 1A for valley topography according to the present embodiment is viewed from the direction blocking the flow path, the flat plate 9 constituting the pair of slope blocks 8 and 8 is provided vertically above the underdrain block 2. , Arranged in an inverted C shape (see FIG. 1).

Further, after the step S5, on the back surface 9b side of the flat plate 9 constituting the slope block 8, for example, a solid material 12 (solid material 12) made of crushed stone, natural stone discharged from the soil when the excavation groove 31 is formed, or the like. Group) is arranged (step S6).
At this time, the solid material 12 arranged adjacent to the second water passage hole 11 on the back surface 9b of the flat plate 9 needs to have a size that does not pass through the second water passage hole 11.
Further, after the step S6, between the solid matter 12 group in which a part of the soil generated when forming the excavation groove 31 is arranged on the back surface 9b side of the slope block 8 and the inner side surface 31a of the excavation groove 31. By returning the soil to the excavated soil 13b, the installation work of the slope block 8 in the excavation ditch 31 is completed (step S7).

By carrying out steps S1 to S7 as described above, the valley terrain drainage structure 1A according to the present embodiment can be installed in a mountainous area or an artificially formed valley terrain 30.
The minimum unit of the underdrain block 2 and the slope block 8 constituting the valley topography drainage structure 1A according to the present embodiment is a combination of one underdrain block 2 and two slope blocks 8, but the valley topography. The number of the underdrain block 2 and the slope block 8 may be appropriately changed according to the installation target of the drainage structure 1A.
Further, in the valley topography drainage structure 1A according to the present embodiment, a case where the length of the underdrain block 2 in the flow path direction is set to be substantially the same as the length of the slope block 8 in the same direction is taken as an example. As explained, these do not necessarily have to match.
Further, in the valley topography drainage structure 1A according to the present embodiment, when the end position of the underdrain block 2 in the flow path direction and the end position of the slope block 8 in the same direction are substantially matched with each other. However, the end position of the underdrain block 2 and the end position of the slope block 8 do not have to match. That is, the flat plate 9 of the slope block 8 may be arranged so as to close the gap formed by the ends of the underdrain block 2.

[1-3; Actions and effects of the basic configuration of the present invention]
In the valley topography drainage structure 1A according to the present embodiment as described above, normally, the water in the buried soil 13a arranged outside the side walls 3 and 3 of the underdrain block 2 passes through the underdrain block 5 through the first water passage hole 5. Water is collected in the hollow portion of 2 and then discharged to the outside of the valley terrain 30 through the hollow portion of the underdrain block 2.
At this time, since the solid matter 12 group is interposed between the side wall 3 of the underdrain block 2 and the buried soil 13a, a part of the buried soil 13a flows into the hollow portion of the underdrain block 2 together with the reclaimed water. Can be prevented. That is, the solid matter 12 group arranged on the outside of the side wall 3 in the underdrain block 2 acts as an anchor for locking the underdrain block 2 in the buried soil 13a, and also acts as an anchor into the underdrain block 2. It also acts as a filter to prevent the inflow of buried soil 13a.

As described above, in the valley topography drainage structure 1A according to the present embodiment, as shown in FIG. 1, the top surface 4a of the ceiling wall 4 of the underdrain block 2 becomes the valley bottom 30b of the valley topography 30 to be installed. On the other hand, the water collected at the valley bottom 30b is collected in the hollow portion of the underdrain block 2 and discharged to the outside of the valley topography 30.
Further, in the drainage structure 1A for valley topography according to the present embodiment, the bottom of the slope 33 made of the underdrain block 2 is covered with a scouring prevention material made of solid matter 12 groups or the like as shown in FIG. 1, for example. There is, or the hard strata and bedrock that naturally exist in the valley terrain 30 are exposed. Therefore, in the valley topography drainage structure 1A according to the present embodiment, since the valley bottom 30b of the valley topography 30 is unlikely to be eroded by the water flow, the risk of landslide or collapse in the surrounding area is extremely small.

Further, in the valley terrain drainage structure 1A according to the present embodiment, when there is a torrential rain or a guerrilla heavy rain in the vicinity of the valley terrain 30 to be installed, there is an unexpected rainfall in a short time. Rainwater that has not completely penetrated into the surface 30a enters the ceiling wall 4 of the underdrain block 2 through the second water passage hole 11 formed in the slope block 8 from the buried soil 13b backfilled in the excavation ditch 31. It is discharged.
Then, the reclaimed water discharged onto the ceiling wall 4 of the underdrain block 2 passes through the canal (second canal) composed of the pair of slope blocks 8 and 8 and the ceiling wall 4 of the underdrain block 2 to the valley topography 30. It is discharged to the outside.
In this case, since the solid matter 12 group is interposed between the slope block 8 and the buried soil 13b, a part of the buried soil 13b flows out to the front surface 9a side of the slope block 8 together with the soil water. Can be prevented. That is, the solid matter 12 group arranged on the back surface 9b side of the flat plate 9 of the slope block 8 acts as an anchor for locking the slope block 8 in the buried soil 13b, and also acts as an anchor. It also acts as a filter to prevent the outflow of the buried soil 13b to the front surface 9a side of the block 8.

As described above, in the drainage structure 1A for valley terrain according to the present embodiment, water does not normally flow on the ceiling wall 4 of the underdrain block 2, but when there is more rainfall than expected around the valley terrain 30. , The top of the ceiling wall 4 of the underdrain block 2 becomes a second water channel, and drainage can be performed quickly from the valley terrain 30.
In this case, since the ceiling wall 4 of the underdrain block 2 is made of reinforced concrete, there is almost no possibility that the ceiling wall 4 will be eroded even when it is used as the second water channel as described above.
Further, when water flows on the ceiling wall 4 of the underdrain block 2, the front surface 9a side of the paired slope blocks 8 temporarily becomes a riverbank, but since this riverbank is also protected by a flat plate 9 made of reinforced concrete, the water flow There is almost no risk of erosion.
Therefore, according to the valley topography drainage structure 1A according to the present embodiment, it is possible to firmly protect the valley bottom 30b side of the valley topography 30 while maintaining good drainage in both normal and emergency situations.
As a result, according to the drainage structure 1A for valley terrain according to the present embodiment, the terrain can be maintained in a stable state for a long period of time while maintaining good drainage of the valley terrain 30.

Further, in the valley topography drainage structure 1A according to the present embodiment, the slope block 8 forming the slope 33 is provided with a copy 10, and the copy 10 is buried in the buried earth 13b. (See FIG. 1) When the earth pressure that tries to push down the flat plate 9 from the back surface 9b side to the front surface 9a side of the slope block 8 acts, the slope block 8 together with the buried soil 13b is an underdrain block 2 It is possible to prevent the ceiling wall 4 from collapsing.
Further, in the valley topography drainage structure 1A according to the present embodiment, the pair of slopes 33 are formed so as to support each other via the underdrain block 2 when viewed from the direction blocking the flow path. Therefore, from this point as well, the collapse of the slope 33 can be suitably suppressed.
Further, since the underdrain block 2 in the valley terrain drainage structure 1A according to the present embodiment is sandwiched by the paired slope blocks 8 and 8, after the installation of the valley terrain drainage structure 1A according to the present embodiment, It is unlikely that the position of the underdrain block 2 will be unintentionally displaced due to the surrounding earth pressure.
Therefore, according to the drainage structure 1A for valley topography according to the present embodiment, it is possible to provide a drainage structure having excellent stability from the above points as well.

FIG. 5 is an image diagram showing a usage state of the drainage structure for valley topography according to the embodiment of the present invention. The same parts as those shown in FIGS. 1 to 4 are designated by the same reference numerals, and the description of the configuration thereof will be omitted.
It is not particularly necessary to specify the sizes of the underdrain block 2 and the slope block 8 constituting the drainage structure 1A for valley topography according to the present embodiment, but for example, as shown in FIG. 5, the underdrain block 2 and the slope block 8 The size may be set to the size in meters (optional component).
In this case, since water does not normally flow on the ceiling wall 4 (top surface 4a) of the underdrain block 2 constituting the underdrain 32, monitoring and management of mountains and the like around the drainage structure 1A for valley topography, or It can be used as a passage for people to come and go for maintenance.
Therefore, according to the drainage structure 1A for valley topography according to the present embodiment, it is possible to provide a drainage structure having excellent convenience.

[2; Detailed structure of the present invention]
[2-1; About the ridges formed in the underdrain block]
As shown in FIGS. 1 to 3 and 5, the underdrain block 2 according to the present embodiment includes a ridge 6 formed along the upper edge 3a (vertically upper edge) of the side wall 3. At the same time, the support surface 7 may be provided on the outer surface of the ridge 6 (arbitrary selection component). Alternatively, although the underdrain block 2 according to the present embodiment is not particularly shown, the support surface 7 may be formed so as to straddle the outer surface of the ridge 6 and the outer surface of the side wall 3 (arbitrary selection component).
In either case, as compared with the case where the underdrain block 2 according to the present embodiment does not have the ridge 6 and has the support surface 7 along the upper edge 3a of the outer surface of the side wall 3, the side wall 3 The area of the outer surface of is relatively large.
In this case, the formation region of the first water passage hole 5 is relatively wide as compared with the case where the underdrain block 2 does not have the ridge 6. As a result, the efficiency of collecting water to the underdrain block 2 can be improved, and the efficiency of drainage from the underdrain block 2 to the buried soil 13a can also be improved.

Further, when the underdrain block 2 is provided with the ridge 6, the flat plate 9 of the slope block 8 can be hooked at a higher position on the vertically upper side of the underdrain block 2 (see FIGS. 1 and 2 and 5). ).
In this case, the area on the vertically upper side that can be protected by the flat plate 9 of the slope block 8 can be expanded. In this case, while reducing the size of the underdrain block 2 and the slope block 8 as much as possible, the valley terrain drainage structure 1A according to the present embodiment can protect a wide range of the valley terrain 30 on the valley bottom 30b side.

[2-2; About the shape of the first water passage hole in the underdrain block]
Further, the first water passage hole 5 formed in the side wall 3 in the underdrain block 2 according to the present embodiment is installed on the bottom surface 31b of the excavation groove 31 as shown in FIGS. 1 to 3 and 5 above. At that time, a plurality of vertically elongated shapes may be arranged side by side (arbitrary selection component).
In this case, as shown in FIGS. 1 to 3 and 5, the appearance of the side wall 3 of the underdrain block 2 forms a fence shape in which a plurality of rods are arranged side by side in the vertical direction.
When the first water passage hole 5 is formed as described above in the underdrain block 2 according to the present embodiment, the first water passage hole 5 is parallel to the flow path of the drainage structure 1A for valley topography. Compared to the case where a plurality of lines are arranged side by side so as to form an elongated shape, the efficiency of collecting water from the buried soil 13a into the underdrain block 2 is improved, and the drainage efficiency from the underdrain block 2 to the buried soil 13a is also improved. Can be done.
Therefore, according to the valley topography drainage structure 1A provided with the underdrain block 2 as described above, the water collection efficiency from the buried soil 13a to the underdrain block 2 is high, and the drainage efficiency from the underdrain block 2 to the buried soil 13a is high. A drainage structure can be provided.

[2-3; Ceiling wall in culvert block]
As shown in FIGS. 1 to 3 and 5 above, the ceiling wall 4 of the underdrain block 2 according to the present embodiment may be a thick plate-shaped wall body having no through hole (arbitrary selection component). ).
In this case, the strength and rigidity of the ceiling wall 4 can be increased as compared with the case where the ceiling wall 4 of the underdrain block 2 has a through hole.
Further, as described above, in the valley topography drainage structure 1A according to the present embodiment, the paired slope blocks 8 support each other via the ceiling wall 4 of the underdrain block 2.
Therefore, the high strength and rigidity of the ceiling wall 4 of the underdrain block 2 means that the forces of the slope blocks 8 arranged so as to support each other also increase.
Therefore, when the underdrain block 2 provided with the ceiling wall 4 made of a thick plate-shaped wall body having no through hole is used, it is composed of the underdrain block 2 and the slope block 8 in the valley topography drainage structure 1A according to the present embodiment. The strength of the linked structure can be improved.
Therefore, according to the valley terrain drainage structure 1A provided with the underdrain block 2 as described above, it is possible to provide a drainage structure having a more excellent protection effect and reinforcement effect on the valley bottom 30b of the valley terrain 30.

[2-4; Deformation example of underdrain block]
Subsequently, a modified example of the underdrain block 2 used in the drainage structure 1A for valley topography according to the present embodiment will be described with reference to FIG.
FIG. 6A is a perspective view showing a first modification of the underdrain block according to the present invention, and FIG. 6B is a perspective view showing a second modification of the underdrain block according to the present invention. The same parts as those shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description of the configuration thereof will be omitted.
As shown in FIG. 6A, the underdrain block 2'according to the first modification may be provided with a recess 6a at a desired position of the ridge 6 formed on the upper edge 3a of the side wall 3 (arbitrary selection configuration). element).
The culvert block 2'according to the modification 1 as shown in FIG. 6A is used as a substitute for the culvert block 2 that forms the culvert 32 in the drainage structure 1A for valley topography as shown in FIGS. 1 and 2 above. Not only can this be done, but by reversing the vertical direction of the underdrain block 2', it can also be used as a clear underdrain block for seepage drainage.
In the underdrain block 2'according to the first modification, the ridge 6 has a recess 6a, so that the ridge portion of the ridge 6 has a serrated shape. Therefore, when the underdrain block 2'is used as an underdrain block for seepage drainage, the ridgeline portion of the serrated ridge 6 is pressed against the installation surface (for example, an excavated surface formed in the soil) to form the underdrain block. It is possible to improve the stability at the time of installation of 2'. That is, it is possible to prevent an unintended misalignment from occurring when the underdrain block 2'is used.
Therefore, according to the underdrain block 2'according to the modification 1, it is possible to provide an underdrain block having higher versatility and functionality.

Further, as shown in FIG. 6B, the underdrain block 2 according to the modified example 2 does not have the ridge 6 on the upper end edge 3a of the side wall 3, and is on the outer surface of the side wall 3 and at the upper end. A support surface 7 formed along the edge 3a may be provided (optional component).
FIG. 7 is a perspective view of a main part of the drainage structure for valley topography according to the present invention, which comprises the underdrain block according to the modified example 2. The same parts as those shown in FIGS. 1 to 6 are designated by the same reference numerals, and the description of the configuration thereof will be omitted.
As shown in FIG. 7, even when the underdrain block 2 according to the modification 2 shown in FIG. 6B is used, the flat plate 9 of the slope block 8 is hooked on the support surface 7 to relate to the modification. The drainage structure 1B for valley topography can be formed.
Therefore, the culvert block 2 without the ridge 6 also has the same action and effect as the culvert block 2 shown in FIGS. 1 to 3 and 5.

[2-5; Modification example of drainage structure for valley topography according to the present invention]
In FIGS. 1 and 2 and 5, the case where only one slope block 8 is arranged on the underdrain block 2 is described as an example, but the slope block 8 arranged on the underdrain block 2 is described. May be a plurality of stages of two or more stages (arbitrary selection component). This point will be described in detail with reference to FIGS. 8 and 9.
FIG. 8 is a perspective view showing the relationship between the underdrain block and the slope block in the drainage structure for valley topography according to another modification of the present invention. The same parts as those shown in FIGS. 1 to 7 are designated by the same reference numerals, and the description of the configuration thereof will be omitted.
As shown in FIGS. 4A and 4B above, the slope block 8 according to the present invention may be provided with a notch 9f along the longitudinal direction of the upper edge 9c of the flat plate 9. (Optional component).
In this case, as shown in FIG. 8, a new slope block 8 is further hooked on the upper edge 9c of the slope block 8 suspended on the support surface 7 of the underdrain block 2 to link them. Can be done.

More specifically, as shown in FIG. 8, in the notch 9f formed in the upper edge 9c of the slope block 8 suspended on the support surface 7 of the underdrain block 2, the other slope block 8 is formed. By hooking the lower edge 9d, the slope block 8 arranged on the vertically lower side and the slope block 8 arranged on the vertically upper side can be linked. By the same procedure, two or more slope blocks 8 can be arranged on the underdrain block 2 while being linked in the vertical direction.
According to the drainage structure 1C for valley terrain according to the present invention in which such slope blocks 8 are linked vertically upward in a plurality of stages, the slope 33 can be formed over a wide area near the valley bottom 30b of the valley terrain 30. can.

In this case, even when the inclined surface 30a forming the valley topography 30 is soil with a strong tendency to weather, the slope 33 can be formed and protected in a wide range. As a result, it is possible to firmly protect a wide range of the inclined surface on the valley bottom 30b side of the valley terrain 30.
Further, according to the drainage structure 1C for valley terrain according to the modified example of the present invention as shown in FIG. 8, even when it is necessary to form the slope 33 in a wide range near the valley bottom 30b of the valley terrain 30, each method is used. It is not necessary to increase the plane size of the flat plate 9 of the surface block 8.
Therefore, the workability of the drainage structure 1C for valley topography according to the modified example of the present invention can be significantly improved.
Further, when the slope block 8 as shown in FIG. 8 is used, when the slope blocks 8 having a plurality of stages are linked on the vertically upper side of the underdrain block 2, the flat plate 9 is provided with a notch 9f so that the flat plate 9 is vertical. Positioning of the slope block 8 in the direction can be performed accurately and easily.

In FIG. 8, a case where a notch 9f is provided on the upper end edge 9c of the slope block 8 in order to link the slope blocks 8 in a plurality of stages on the underdrain block 2 is described as an example. The flat plate 9 of the surface block 8 does not necessarily have to have the notch 9f. This point will be described in detail with reference to FIG.
FIG. 9 is a perspective view showing the relationship between the underdrain block and the slope block in the drainage structure for valley topography according to another modification of the present invention. The same parts as those shown in FIGS. 1 to 8 are designated by the same reference numerals, and the description of the configuration thereof will be omitted.
When a slope block 8'without a notch 9f is used on the upper edge 9c of the flat plate 9, another slope is on the back surface 9b side of the upper edge 9c of the flat plate 9 as shown in FIG. The back surface 9b side of the lower end edge 9d of the flat plate 9 of the block 8'may be brought into contact with each other to link them. In addition, it is possible to arrange two or more steps of slope blocks 8'on the underdrain block 2 by the same procedure.
Then, according to the valley terrain drainage structure 1D according to the present embodiment in which the slope blocks 8'as shown in FIG. 9 are linked in a plurality of stages vertically upward, the valley terrain drainage structure shown in FIG. 8 above. It is possible to exert the same action / effect as 1C.
Further, particularly when the slope block 8'as shown in FIG. 9 is used, it is not necessary to form the notch 9f in the flat plate 9 at the time of molding, so that the strength of the flat plate 9 forming the slope block 8'is lowered. Can be prevented. In addition, it has the advantage that the mold for molding the slope block 8'can be simplified.
Therefore, according to the drainage structure 1D for valley topography according to the present embodiment, the manufacturing cost of the slope block 8'can be reduced while particularly increasing the strength of the slope. As a result, the construction cost of the drainage structure 1D for valley topography, which is excellent in strength and stability, can be reduced.

[2-6; Detailed structure of drainage structure for valley topography according to the present invention]
In the valley terrain drainage structure according to the present embodiment (for example, the valley terrain drainage structure 1A shown in FIG. 1), the solid matter 12 group arranged on the outside of the side wall 3 of the underdrain block 2 and the inner surface of the excavation ditch 31. The case where the buried soil 13a is inserted between 31a is described as an example, but a granular material group having an average particle size smaller than that of the solid material 12 group is interposed between the solid material 12 group and the buried soil 13a. You may. Similarly, between the solid matter 12 group arranged on the back surface 9b side of the slope block 8 and the buried soil 13b, a granular material group having an average particle size smaller than that of the solid matter 12 group may be interposed. (Any granular material group is an optional component).
In this case, since the drainage structure for valley topography according to the present embodiment includes the granular material group (not shown) in addition to the solid material 12 group, it is more excellent than the case where only the solid material 12 group is provided. It is possible to exert a filter effect.

In this case, when the soil water in the buried soil 13a is collected in the underdrain block 2, it is possible to more reliably prevent the buried soil 13a from being mixed into the underdrain block 2. Further, when the soil water in the buried soil 13b is drained to the front surface 9a side of the slope block 8 (on the top surface 4a of the underdrain block 2), it is more reliable that the buried soil 13b is mixed in the drainage. Can be prevented.
Therefore, when the drainage structure for valley topography according to the present embodiment includes a group of granules in addition to the group of solids 12, it is possible to prevent the buried soil 13a from accumulating in the hollow portion of the underdrain block 2. Similarly, in the drainage structure for valley topography according to the present embodiment, it is possible to prevent the buried soil 13b from accumulating in the second drainage channel composed of the top surface 4a of the underdrain block 2 and the pair of slopes 33 and 33. ..
As a result, it is possible to provide a drainage structure for valley terrain that is less likely to be clogged by the buried soil 13a or 13b that has flowed into the drainage channel when the drainage structure for valley terrain according to the present embodiment is used.

Further, in the drainage structure for valley topography according to the present embodiment, the planar shape of the first water passage hole 5 formed on the side wall 3 of the underdrain block 2 (or the underdrain block 2'or the underdrain block 2 ") is elongated. Although a certain case has been described as an example, the planar shape of the first water passage hole 5 formed in the side wall 39 may be a shape other than the one shown in the drawing if water can flow in the thickness direction of the side wall 39. good.

Further, in the drainage structure for valley topography according to the present embodiment, the case where the slope block 8 and the flat plate 9 of the slope block 8'are in a grid pattern is described as an example, but the form of the flat plate 9 is not necessarily the same. It is not necessary to have a grid shape, and the planar shape of the second water passage hole 11 formed in the flat plate 9 may be a shape other than the one shown in the figure as long as water can pass in the thickness direction of the flat plate 9.

In addition, the drainage structure for valley terrain according to the present embodiment is assumed to be installed and used mainly in the valley terrain 30 in the mountains, but it can also be used in the valley terrain 30 artificially formed in urban areas and the like. It can be applied without any trouble.
At that time, the underdrain block (underdrain block 2 to 2 "etc.) and the slope block (slope block 8, 8'etc.) constituting the drainage structure for valley topography according to the present embodiment are not necessarily in the size of meters. It does not have to be, and may be less than 1 meter (several tens of centimeters) in size depending on the purpose of use.
Further, the underdrain block (underdrain block 2 to 2 "etc.) and the slope block (slope block 8, 8'etc.) constituting the drainage structure for valley topography according to the present embodiment are sufficient according to the purpose of use. As long as it has strength, it may be made of concrete without reinforcing bars.

In the present embodiment, for example, a case where crushed stone (concrete stone or the like conventionally known) or natural stone collected when forming the excavation ditch 31 is used as the solid matter 12 or the granular matter group (not shown) will be described as an example. However, in addition to these, crushed waste concrete can be classified. In this case, crushed waste concrete or the like may be used alone, or may be mixed with crushed stone or natural stone as needed. In either case, the same action and effect as when crushed stone or natural stone is used is obtained.

In this embodiment, a drainage structure for valley topography including an underdrain block (underdrain block 2 to 2 "etc.) and a slope block (slope block 8, 8'etc.) as an essential configuration is described. The underdrain block (underdrain block 2 to 2 "etc.) used in the drainage structure for valley topography according to the present invention is also an independent invention.
Further, in the present embodiment, the case where the soil generated when forming the excavation groove 31 is used as the buried soil 13a and 13b is described as an example, but the buried soil 13a and 13b are not necessarily soil. It is not necessary, and crushed stones similar to the solid material 12 group, natural stones of a desired size, crushed waste concrete crushed materials classified as necessary, or a combination thereof can be used.

As described above, the present invention is a drainage structure for valley topography and an underdrain block for that purpose, which can firmly protect the valley bottom of the valley topography and the slope near the valley bottom while maintaining good drainage at the valley bottom of the valley topography. It can be used in fields related to agriculture, civil engineering, water control, etc.

1A-1D ... Drainage structure for valley terrain 2,2', 2 "... Underdrain block 3 ... Side wall 3a ... Upper edge 3b ... Lower edge 4 ... Ceiling wall 4a ... Top surface 5 ... First water passage 6 ... Protrusion 6a ... Recess 7 ... Support surface 8,8'... Slope block 9 ... Flat plate 9a ... Front 9b ... Back 9c ... Upper edge 9d ... Lower edge 9f ... Notch 10 ... Reserve 11 ... Second water flow Holes 12 ... Solids 13a, 13b ... Buried soil 30 ... Valley topography 30a ... Inclined surface 30b ... Valley bottom 31 ... Drilling ditch 31a ... Inner side surface 31b ... Bottom surface 32 ... Underdrain 33 ... Slope

Claims (6)

It is a drainage structure consisting of a slope formed near the bottom of the valley in the valley topography and an underdrain provided at the bottom of the valley.
The culvert is
A pair of side walls made of concrete, a ceiling wall connecting the vertically upper edges of the pair of side walls made of concrete, and a first water passage that is provided through the thickness direction of the side walls and moves water in the same direction. An underdrain block with a hole,
A group of solids, which is arranged outside the side wall of the underdrain block and is composed of individual solids, is provided.
The slope is
A flat plate made of concrete that forms the slope near the bottom of the valley, a backing that is projected on the back side of the flat plate to fix the flat plate to the slope, and a plate that penetrates the thickness direction of the flat plate. A slope block with a second water hole to move water in the direction, and a slope block.
A group of solids, which are arranged on the back side of the flat plate and are composed of individual solids, are provided.
The underdrain block is formed along the vertically upper edge of the side wall and has a support surface inclined toward the inclined surface of the valley terrain.
A drainage structure for valley terrain, characterized in that the flat plate of the slope block is suspended from the support surface of the underdrain block. The underdrain block comprises a ridge formed along the vertical upper edge of the sidewall.
The drainage structure for valley topography according to claim 1, wherein the support surface is formed on the ridge or straddling the side wall and the ridge. The valley topography drainage structure according to claim 1 or 2, wherein the first water passage hole of the underdrain block is elongated in the vertical direction. The drainage structure for valley terrain according to any one of claims 1 to 3, wherein the ceiling wall of the underdrain block does not have a through hole. The underdrain block used in the drainage structure for valley terrain according to any one of claims 1 to 4.
The underdrain block is
An underdrain block comprising the side wall, the ceiling wall, the first water passage hole, and the support surface provided on the side wall. The underdrain block comprises a ridge formed along the vertical upper edge of the sidewall.
The underdrain block according to claim 5, wherein the support surface is formed on the ridge or straddling the side wall and the ridge.

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