JP5349551B2 - Structure for sedimentation, sedimentation pond construction method, and waterway recovery method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for earth and sand sedimentation such that it is easy to secure a site for installing a temporary sedimentation basin, and the installation and removal can be carried out easily at low cost. <P>SOLUTION: There is provided a structure 1 for earth and sand sedimentation that is installed in ground, and used permanently as a water passage, and temporarily as a sedimentation basin which receives muddy water flowing in and including earth and sand and sediments the earth and sand. The structure includes a trench 11 which serves as the water passage and sedimentation basin; a partition wall 28 which is arranged at a downstream end of the trench and stops the earth and sand in the muddy water flowing down in the trench from flowing out when the trench is used as the sedimentation basin; an overflow port 30 which is formed by penetrating an upper part of a sidewall 13 constituting the trench, and discharges supernatant fluid separated from the earth and sand in the muddy water; and an overflow port closing member which closes the overflow port when the trench is used as the water passage. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a sedimentation basin that separates earth and sand from muddy water generated during construction of forest land, site preparation, and the like. More specifically, a structure that is permanently used as a waterway is temporarily set in a sedimentation basin. The present invention relates to a structure for sedimentation, a sedimentation basin construction method, and a waterway recovery method for use as a soil.

When a large amount of rain falls on a forest land under development or land being developed, muddy water is generated by mixing rainwater and earth and sand. If turbid water containing a large amount of earth and sand is drained directly into rivers or oceans, water quality will be contaminated. Therefore, a temporary sedimentation basin (sedimentation basin) will be installed at the construction site while turbid water may be generated. Is separated and drained into rivers.
The conventional temporary sedimentation basin is a pond shape in which muddy water is introduced into a recess formed by excavating the ground, and the upper space of the temporary sedimentation basin cannot be used. Therefore, it was necessary to install the temporary sedimentation basin in the site that is the subject of construction and in a place that does not hinder the construction. In addition, if it becomes necessary to install a new structure in the place where the temporary sedimentation basin was installed as the construction progresses, the temporary sedimentation basin will be installed at a new location and the temporary It was necessary to take measures such as refilling the sedimentation basin.
From the above situation, there was a problem that it was difficult to secure a site for installing a temporary sedimentation basin at the end of the construction. In addition, in a pond-like temporary sedimentation basin installation site, there is a problem that the construction work of the structure cannot be performed on the pond-like temporary sedimentation basin, so that the site maintenance work of the installation site is delayed.
As an invention that can solve the above problem, Patent Document 1 discloses a sewage purification apparatus for rivers and the like that is configured by a box culvert. In this invention, since a sewage purification apparatus is installed in a culvert using a box culvert, a site for installing the sewage purification apparatus can be easily secured. It is also possible to install a structure on the above-ground part where the sewage purification apparatus is buried.

JP-A-8-13001

However, since the sewage purification apparatus described in Patent Document 1 is a facility that is supposed to be used permanently, the scale of the apparatus is large, and if used as a temporary facility, the labor for installation and removal is enormous. There is a problem of becoming.
The present invention has been made in view of the above circumstances, and it is easy to secure a site for installing a temporary sedimentation basin, and the earth and sand that can minimize the costs and labor involved in the installation of a sedimentation basin etc. It aims at providing the structure for sedimentation, the construction method of a sedimentation basin, and the removal method of a sedimentation basin.

In order to solve the above-mentioned problems, the invention according to claim 1 is installed in the ground and is permanently used as a water channel, and temporarily receives muddy water containing earth and sand flowing in. A structure for sedimentation used as a sedimentation basin for sedimenting, wherein the water channel and a groove serving also as the sedimentation basin are disposed at a downstream end of the groove when the groove is used as a sedimentation basin. A partition wall that prevents the outflow of earth and sand in muddy water flowing down in the groove, and an overflow that discharges the supernatant liquid formed through the upper part of the side wall constituting the groove and separated from the muddy water in the muddy water to the outside of the groove It is characterized by a sediment-precipitating structure comprising an opening and an overflow opening closing member that closes the overflow opening when the groove is used as a water channel.
In invention of Claim 1, a part of water channel permanently installed is utilized as temporary sedimentation equipment. Sediment in muddy water is blocked by the partition wall located at the downstream end of the groove and accumulated in the groove, and the supernatant liquid accumulated on the accumulated earth and sand is taken out from the overflow port formed in the upper part of the side wall by crossover. .
The invention according to claim 2 is characterized in that the structure for sediment sedimentation according to claim 1 is provided with a supernatant liquid discharge part for receiving the supernatant liquid discharged from the overflow port.
The supernatant liquid flows down further downstream or is temporarily stored in the supernatant liquid discharge section.

The invention according to claim 3 is characterized by the structure for sediment sedimentation according to claim 2, wherein the supernatant liquid discharge part includes a cylindrical body having a hollow part into which the supernatant liquid flows.
The supernatant liquid introduced into the cylindrical body does not leak into the ground, and further flows downstream or is temporarily stored.
The invention according to claim 4 is characterized by the structure for sedimentation according to claim 3, wherein the cylindrical body is embedded in the ground.
In invention of Claim 4, the site | part of an above-ground part can be effectively utilized by burying the cylindrical body of a supernatant liquid discharge part in the ground.
The invention according to claim 5 is characterized in that the supernatant liquid discharge part is formed by excavating the ground around the groove, and the structure for sedimentation according to claim 2 is formed.
In the invention of claim 5, the supernatant liquid discharge part can be formed easily and inexpensively.

The invention according to claim 6 is characterized by the structure for sediment sedimentation according to any one of claims 1 to 5, wherein a front overflow port for allowing the supernatant liquid to overflow is formed in an upper part of the partition wall. To do.
By using the crossover from the overflow port and the front overflow from the upper part of the partition wall, the supernatant liquid can be efficiently discharged from the groove.
Invention of Claim 7 is a sedimentation basin construction method using the structure for sediment sedimentation as described in any one of Claims 1 thru | or 6, Comprising: The sediment in muddy water in the upper part of the side wall which comprises the said groove | channel A sedimentation basin construction method comprising a step of penetrating and forming an overflow port for discharging the supernatant liquid separated from the outside of the groove.
The invention according to claim 8 is a water channel recovery method for recovering the sedimentation basin constructed by the sedimentation basin construction method according to claim 7 to a water channel, the step of removing the sediment deposited in the groove, And a step of restoring the side wall by closing the overflow port with an overflow port closing member.
In the sedimentation basin temporarily set up in the present invention, in order to deposit earth and sand in the groove and take out the supernatant liquid by crossover, the upper part of the side wall constituting the groove is processed to form an overflow port. If it is a permanently installed waterway, it can be processed into a sedimentation basin, whether it is a newly established waterway or an existing waterway. Moreover, after using as a sedimentation basin, it can function as a water channel again by cleaning the inside of a ditch and closing an overflow port.

  In the present invention, a permanently installed water channel is used as a temporary settling basin. That is, since the site including the waterway site is used as a sedimentation basin, it is easy to secure the site for installing the sedimentation basin. In addition, since the site that has already been constructed as a waterway is used as a sedimentation basin, the site maintenance work at the location where the sedimentation basin is installed will not be delayed. In addition, since the water channel can be recovered and is processed into a sedimentation basin, the cost and labor involved in the sedimentation basin installation and the like can be minimized.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure for sedimentation which concerns on 1st embodiment of this invention, (a) is a top view, (b) is XX sectional drawing, (c) is YY cross section. FIG. (A)-(d) is a figure which shows the example of a partition wall. (A), (b) is the principal part perspective view which showed the overflow port. It is a figure which shows the structure for sedimentation which concerns on 2nd embodiment of this invention, (a) is a top view, (b) is XX sectional drawing, (c) is a YY cross section. FIG.

[First embodiment]
Hereinafter, the structure for sedimentation according to the first embodiment of the present invention will be described in detail with reference to FIG. Drawing 1 is a figure showing structure for sediment sedimentation concerning a first embodiment of the present invention, (a) is a top view, (b) is an XX sectional view, and (c) is It is YY sectional drawing. The structure for sedimentation according to the present embodiment is characterized in that the structure that is permanently used as a waterway is processed to be temporarily usable as a sedimentation basin. Can be restored to the waterway.
Sediment sedimentation structure 1 is a structure that is installed in the ground and is permanently used as a waterway, but temporarily accepts turbid water that contains inflowing sediment and precipitates sediment. Used as a pond.
The sediment sedimentation structure 1 is disposed at the downstream end of the groove 11 and flows down in the groove 11 when the groove 11 is used as a sedimentation basin, with a water channel and a groove 11 that also serves as a sedimentation basin. A partition wall 20 that prevents outflow of earth and sand in muddy water, and an overflow port 30 that is formed through the upper portion of the side wall 13 that constitutes the groove 11 and discharges the supernatant liquid separated from the muddy water and sand to the outside of the groove 11; When the groove 11 is used as a water channel, an overflow port closing member 40 (see FIG. 3) for closing the overflow port 30 and a supernatant liquid discharge unit 50 for receiving the supernatant liquid discharged from the overflow port 30. I have.

The part used permanently as a waterway will be described. Of the structure 1 for sediment sedimentation, the side groove 10 and the water collecting trough 60 that is disposed at the downstream end of the side groove 10 and constitutes a part of the supernatant liquid discharge part 50 are permanently installed and used as a water channel. It is a part. In the figure, an arrow A indicates the flow direction of muddy water or drainage flowing in the groove 11.
The gutter 10 is permanently installed for the purpose of safely flowing down the rainfall within the site where development and construction have been performed, and finally discharging it into the river or the sea. Of course, it may be a water channel used for other purposes. Moreover, it may be newly established at the time of land development or may be an existing one.
The gutter 10 according to the present invention is not only used as a water channel, but also used as a sedimentation basin for sedimentation, so that a depth sufficient to deposit sediment when using it as a sedimentation basin can be secured. Therefore, it is necessary that the overflow port 30 can be formed so as to penetrate the portion where there is no problem in terms of structure. As an example, when the installation location of the side groove 10 is on the passage of the vehicle, it is necessary that the overflow port 30 can be formed penetrating in a state in which the side groove 10 does not break even when the vehicle passes.

The side groove 10 includes a groove 11 formed by a side wall 13 and a bottom surface 15. A free-gradient side groove is used as the side groove 10 of the present embodiment, a part of the upper surface is opened, and the other part of the upper surface is closed by a lid member. As the side groove used in the structure for sediment sedimentation, a side groove in which a part or all of the upper surface is opened may be used, or a side groove in which the upper surface is completely closed may be used. When using a side ditch whose upper surface is completely closed, when used as a settling basin, the entire settling basin including the side ditch 10 can be completely buried in the ground, effectively utilizing the upper space of the settling basin. be able to.
In addition, in this embodiment, since the cementitious material was used for the gutter 10, it is homogeneous for closing (filling) the opening necessary for the processing to the settling basin and the recovery to the water channel and the adhesion of each member. Material non-shrink mortar was used. Of course, a side groove other than the cement-based material may be used and necessary processing may be performed using a material suitable for the material.

  The catchment basin 60 is a member that is provided at an intermediate point of the water channel when the confluence of the water channel and the extension of the water channel are long, and is a general accessory of a side groove. A drainage port 63 is formed through the bottom of the side wall 61 of the catchment basin 60 to discharge the wastewater collected in the catchment basin 60 further downstream. In the present embodiment, both the side groove 10 and the catchment basin 60 are used as a settling basin, but only the side groove 10 can be used as a settling basin.

The site | part temporarily installed in order to use as a sedimentation basin is demonstrated.
The partition wall 20 is a part that blocks sediment in muddy water, and is installed at a position and height that can prevent at least the sediment from flowing in muddy water and allow the groove 11 to function as a sedimentation basin. In the present embodiment, the partition wall 20 is installed at a boundary portion between the side groove 10 and the water collecting trough 60. A specific example of the partition wall will be described with reference to FIG. Fig.2 (a)-(d) is a figure which shows the example of a partition wall.
(A) has shown the partition wall 20 shown in FIG. 1, and is filled with the mortar by predetermined thickness and height in the boundary part of the side groove 10 and the water collecting basin 60. FIG. The gutter 10 and the water collecting basin 60 communicate with each other at the front overflow port 21 at the upper part of the partition wall 20, and the supernatant liquid separated from the muddy water sediment can be allowed to overflow from the upper edge of the partition wall 20 to the front. it can. At the overflow port 30, the supernatant liquid is taken out by the horizontal overflow. By using both the horizontal overflow by the overflow port 30 and the front overflow by the front overflow port 21, the supernatant liquid can be efficiently discharged.
(B) is an example in which a sandbag is piled on the boundary portion between the gutter 10 and the catchment 60 to form the partition wall 23. In addition, the partition wall 23 can be formed using the soil of the site | part excavated when installing the supernatant liquid discharge part 50 as a sandbag. It can also be used for backfilling after being used as a sandbag. By using in this way, the soil of the excavation site can be used effectively. Similarly to (a), the upper part of the partition wall 23 is a front overflow port 21.

(C) is an example in which a partition wall 25 is formed by arranging a plate at the boundary portion between the side groove 10 and the water collecting trough 60. The upper part of the partition wall 25 becomes the front overflow port 21 like (a). A support bar 26 that prevents the partition wall 25 from tilting is disposed on the downstream side of the partition wall 25 with reference to the flow direction of the muddy water flow. The support bar 26 prevents both the partition wall 25 and the side wall 61 located on the downstream end side of the catchment basin 60 from tilting, thereby preventing the partition wall 25 from tilting. In order to prevent the partition wall 25 from tilting, a weight such as a sandbag may be used in combination.
(D) is an example in which the side wall 61 itself on the downstream end side of the catchment basin 60 is used as a partition wall. That is, the groove 11 of the side groove 10 and the catchment basin 60 are combined and used as a settling basin. In this case, mortar is filled in the discharge port 65 for discharging the wastewater collected in the catchment 60 to the downstream side, and temporarily closed to prevent outflow of earth and sand to the outside of the gutter 10 and the catchment 60. To do.

About (a) thru | or (c), although it is an example which provided the partition wall in the boundary part of the side groove | channel 10 and the water collecting basin 60, even if the water collecting basin part of a figure is a side groove | channel, it can implement. In other words, the partition wall may be disposed in the middle portion of the side groove 10 with the water flow direction (arrow A direction) as a reference. In addition, about (c), in order to prevent the plate-shaped partition wall 25 being pushed downstream by muddy water flow, it is necessary to use weights, such as sandbags, together.
Further, a net for capturing fallen leaves and the like may be installed at the front overflow port 21.
Further, the bottom wall 15 of the side groove 10 to the uppermost position of the side wall 13 (up to the top surface 17 of the side groove 10) is completely closed by the partition wall, and both earth and sand in the muddy water move to the downstream side of the partition wall. It may be configured to prevent this (see the second embodiment).

The overflow port 30 (FIG. 1) is a part that causes the clear supernatant liquid separated from the muddy water that has flowed into the groove 11 to crossover. As described above, the side groove 10 is formed so as to penetrate in a place where there is no problem in strength in terms of structure. As described in the description of the partition wall 20, it can be used together with the front overflow port 21. A net for capturing fallen leaves and the like may be installed at the overflow port 30. A specific example of the overflow port will be described with reference to FIG. 3 (a) and 3 (b) are perspective views of the main part showing the overflow port.
FIG. 1A shows the overflow port 30 shown in FIG. 1, and is an example in which a circular overflow port 30 is formed through the side wall 13 of the side groove 10. In FIG. 3A, the upper surface of the side groove 10 is closed, but a similar overflow port can be formed through the upper portion of the side wall of the U-shaped side groove whose upper surface is opened. When the overflow port 30 is formed, the overflow port closing member 31 that is substantially fitted to the overflow port 30 is separated from the side wall 13. The overflow port closing member 31 is used to close the overflow port 30 when the gutter 10 used as a settling basin is restored to the water channel. The shape of the overflow port is not limited to the above shape, and may be a polygonal shape or other shapes.
(B) is the example which formed the overflow port 35 in the upper end edge of the side wall 34 of the U-shaped side groove | channel 33 with which the upper surface was opened. Thus, it is good also as a notch-shaped overflow port. Similarly to (a), when the overflow port 35 is formed, the overflow port closing member 36 that is substantially fitted to the overflow port 35 is separated from the side wall 34. The overflow port closing member 36 is used when closing the overflow port 35. The shape of the overflow port is not limited to the above shape, and may be a polygonal shape or other shapes.

The supernatant liquid discharge part 50 (FIG. 1) is a part which makes the supernatant liquid discharged | emitted from the overflow port 30 flow down, or is temporarily stored, and several 1st communicated with the overflow port 30 in the one end part 51a. A discharge pipe 51, a second discharge pipe 53 communicating with each first discharge pipe 51 at the other end 51b of each first discharge pipe 51, and a supernatant liquid flow downward direction (in the direction of arrow B in the drawing) of the second discharge pipe 53 And a drainage basin 60 communicating with the downstream end 53a via the discharge port 63. The 1st discharge pipe 51 and the 2nd discharge pipe 53 are arrange | positioned in the position lower than the ground surface.
The first discharge pipe 51 is a crossover path through which the supernatant liquid discharged from the overflow port 30 flows down.
The second discharge pipes 53 are connected to the respective first discharge pipes 51 at appropriate positions in the middle of the supernatant liquid flow direction, collect the supernatant liquid discharged from the respective first discharge pipes 51, and further flow the supernatant liquid downstream. It is allowed to flow down to the water collecting basin 60 on the side.
The 1st discharge pipe 51 and the 2nd discharge pipe 53 are cylindrical bodies provided with the hollow part into which a supernatant liquid flows in, respectively, for example, are comprised from the corrugated pipe made from polyethylene. The illustrated first discharge pipe 51 and second discharge pipe 53 are substantially cylindrical, but other shapes of cylindrical bodies (for example, square tubes) may be used. Moreover, it is good also as a structure which connects a cylindrical 1st discharge pipe to the notch-shaped overflow port 35 shown in FIG.3 (b).

  In this embodiment, each connecting portion of the overflow port 30, the first discharge pipe 51, the second discharge pipe 53, and the discharge port 63 is subjected to a coking process, and the flow of the supernatant liquid of the second discharge pipe 53 The direction upstream end 53b is closed, and the supernatant liquid does not leak into the ground. Therefore, the entire first discharge pipe 51 and the second discharge pipe 53 can be buried in the ground (FIG. 1 (c)). Therefore, when the earth sediment sedimenting structure 1 is temporarily used as a sedimentation basin, the ground site can be effectively utilized. For example, by embedding the first discharge pipe 51 and the second discharge pipe 53 in the road land, the ground portion can be used as a road through which vehicles and the like pass while the sediment sediment structure 1 functions as a sedimentation basin.

When the structure 1 for sedimentation described above functions as a sedimentation basin, the introduction of muddy water into the groove 11 includes a method using a temporary drainage channel (drainage pipe) and a method using the upstream side of the groove 11. is there. In the case of the former, in addition to the sediment sedimenting structure 1, a temporary drainage channel composed of polyethylene corrugated pipes and the like is separately installed, and muddy water is introduced into the temporary drainage channel using a pump and the sediment sedimenting structure 1 Into the groove 11. In the latter case, the upstream groove 11 of the sediment sediment structure 1 is used as a muddy water introduction path. According to the latter method, there is no need to install a temporary drainage channel.
In the present embodiment, the supernatant liquid is collected in a water collecting tank. The collected supernatant is pumped up using a pump, and finally discharged into the sea or river.

A method for temporarily remodeling a permanently installed water channel into a sediment-precipitating structure 1 as shown in FIG. 1 will be briefly described.
First, the gutter 10 and the water collecting trough 60 are installed as waterway equipment. Note that existing waterway facilities may be used. When utilizing the existing waterway equipment, the ground is excavated along the side wall of the gutter in advance to secure a space where the supernatant liquid discharge part can be installed.
Next, the partition wall 20 is installed at the downstream end of the groove 11. In the present embodiment, mortar is filled from the bottom surface 15 to a predetermined height. The height required for the partition wall 20 is calculated based on the volume of earth and sand deposited in the groove 11. Moreover, in order to make a supernatant liquid flow over the front from the upper part of the partition wall 20, the upper part was made into the opening part (front overflow port 21).

Subsequently, the overflow port 30 is formed through the upper portion of the side wall 13 constituting the groove 11. The overflow port 30 is formed at a position where there is no problem in strength when the groove 11 is used as a settling basin and when the overflow port 30 is repaired and used as a water channel. In the present embodiment, a part of the side wall 13 is cut into a circular shape to form the overflow port 30. The columnar member separated from the side wall 13 when the overflow port 30 is formed is used as the overflow port closing member 31 that closes the overflow port 30 when the sediment-precipitating structure 1 is restored to the water channel.
The supernatant liquid discharge part 50 is installed. One end 51 a of the first discharge pipe 51 is communicated with the overflow port 30. Similarly, the other end 51 b of the first discharge pipe 51 is communicated with the second discharge pipe 53. The upstream end 53 b of the second discharge pipe 53 is closed, and the downstream end 53 a is communicated with the discharge port 63 of the catchment 60. In addition, when communicating each part, a caulking process is performed so that a water leak may not be caused.
It can be used as a sedimentation basin by flowing muddy water from the upstream side of the groove 11 in this state. If necessary, the first discharge pipe 51 and the second discharge pipe 53 are buried in the ground.

Subsequently, a method for recovering the sediment-precipitating structure 1 converted into a sedimentation basin by the above-described method into a water channel will be described. When all or part of the sediment sediment structure 1 is buried in the ground, the portion is excavated and exposed in advance.
First, earth and sand accumulated in the groove 11 are removed and cleaned. The removal of earth and sand may be performed manually by an operator, or may be performed mechanically using a vacuum vehicle or the like. Note that. The taken earth and sand may be dried and used for backfilling the ground of the supernatant liquid discharge unit 50 installation part.
Next, the supernatant liquid discharge part 50 is removed. The first discharge pipe 51 is disconnected from the overflow port 30, and the second discharge pipe 53 is disconnected from the discharge port 63. Another water channel that is permanently used is connected to the discharge port 63.
Subsequently, the overflow port 30 is closed. The overflow port 30 is closed by the overflow port closing member 31 generated when the overflow port 30 is formed, and bonded with a non-shrink mortar. Note that the overflow port 30 may be closed by filling non-shrink mortar.
Further, the partition wall 20 is removed, and repair is performed so that the drainage flows from the groove 11 toward the water collecting tank 60.
Finally, the ground at the place where the supernatant liquid discharge unit 50 is installed is backfilled.
In addition, when newly establishing a waterway, you may utilize the side groove 10 by which the overflow port 30 was opened previously. The opening operation of the overflow port 30 at the site can be omitted, and the sedimentation basin can be efficiently constructed.

  As described above, according to the present embodiment, a permanently installed water channel is used as a temporary settling basin. That is, since the site including the waterway site is used as a sedimentation basin, it is easy to secure the site for installing the sedimentation basin. In addition, since the site that has already been constructed as a waterway is used as a sedimentation basin, the site maintenance work at the location where the sedimentation basin is installed will not be delayed. In addition, since the water channel can be recovered and is processed into a sedimentation basin, the cost and labor involved in the sedimentation basin installation and the like can be minimized. Moreover, since the supernatant liquid discharge part can be buried in the ground, the site on the ground part can be effectively used while being used as a sedimentation basin.

[Second Embodiment]
A structure for sedimentation according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4: is a figure which shows the structure for earth and sand precipitation which concerns on 2nd embodiment of this invention, (a) is a top view, (b) is XX sectional drawing, (c) is It is YY sectional drawing. The present embodiment is characterized in that a water channel is formed by excavating the ground at a site adjacent to the side wall of the side groove as the supernatant liquid discharge portion. Hereinafter, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The supernatant liquid discharge part 80 of the structure 2 for sediment sedimentation is formed by excavating the ground at a site adjacent to the side wall 13 of the gutter 10. The ground surface exposed by excavation is covered with a synthetic resin sheet (penetration prevention sheet 81) such as polyethylene to prevent the supernatant liquid from penetrating into the ground. In addition, the penetration of the supernatant liquid into the ground may be prevented by using other penetration preventing means such as resin dispersion. The supernatant liquid flowing out from the overflow port 30 flows down in the supernatant liquid discharge part 80 in the direction of arrow B, and flows into the water collection tank 60 from the first discharge port 67 of the water collection tank 60. In addition, the supernatant liquid discharge part 80 is inclined so that the supernatant liquid flows toward the first discharge port 67.

The illustrated water collecting trough 60 includes a first discharge port 67 and a second discharge port 69 on two surfaces other than the connection surface with the side groove 10. The first discharge port 67 is connected to the downstream end of the supernatant liquid discharge unit 80, and the supernatant liquid flowing out from the overflow port 30 flows into the catchment basin 60 from the first discharge port 67. The second discharge port 69 is formed in the side wall 61 facing the first discharge port 67, and discharges the supernatant liquid that has flowed into the water collection tank 60 from the water collection tank 60.
One end of a drainage channel 90 that is permanently used is connected to the second discharge port 69, and the supernatant liquid that has flowed out of the second discharge port 69 flows down the drainage channel 90 in the direction of arrow C, Eventually it flows into the sea and rivers.
A partition wall 28 is installed at the boundary between the side groove 10 and the water collecting trough 60. The partition wall 28 according to the present embodiment is in contact with the upper surface 17 of the side groove 10. In other words, the partition wall 28 has the same height as the side wall 13 of the side groove 10, and the front overflow port 21 (see FIG. 1B) is not formed. In addition, you may use the thing of any type of Fig.2 (a)-(c) for a partition wall.

As described above, according to the present embodiment, a permanently installed water channel is used as a temporary settling basin. That is, since the site including the waterway site is used as a sedimentation basin, it is easy to secure the site for installing the sedimentation basin. In addition, since the site that has already been constructed as a waterway is used as a sedimentation basin, the construction work for the site where the sedimentation basin is installed will not be delayed. In addition, since the water channel can be recovered and is processed into a sedimentation basin, the cost and labor involved in the sedimentation basin installation and the like can be minimized. Moreover, the supernatant liquid discharge part simply excavates the ground beside the gutter and takes measures to prevent the penetration of the supernatant liquid, and can be easily and inexpensively created.
The two embodiments described above are only one embodiment of the present invention. The present invention can be modified in many ways within the scope of the technical idea described above.

  DESCRIPTION OF SYMBOLS 1, 2 ... Structure for sedimentation, 10 ... Side groove, 11 ... Groove, 13 ... Side wall, 15 ... Bottom surface, 17 ... Upper surface, 20 ... Partition wall, 21 ... Front overflow port, 23 ... Partition wall, 25 ... Partition Wall, 26 ... Support bar, 28 ... Partition wall, 30 ... Overflow port, 31 ... Overflow port closing member, 33 ... U-shaped side groove, 34 ... Side wall, 35 ... Overflow port, 36 ... Overflow port closing member, 40 ... Overflow port closing member, 50 ... Liquid discharge part, 51 ... First discharge pipe, 53 ... Second discharge pipe, 60 ... Catchment, 61 ... Side wall, 63 ... Discharge port, 65 ... Discharge port, 67 ... 1st discharge port, 69 ... 2nd discharge port, 80 ... Liquid discharge part, 81 ... Permeation prevention sheet, 90 ... Drainage channel

Claims (8)

It is a structure for sedimentation that is installed in the ground and is used as a waterway permanently, and is used as a sedimentation basin that accepts muddy water containing temporarily flowing in sediment and settles the sediment.
A groove that also serves as the water channel and the settling basin; and a partition wall that is disposed at a downstream end of the groove when the groove is used as a settling basin and prevents outflow of earth and sand flowing in the groove. An overflow port that is formed through the upper part of the side wall of the groove and is separated from the sediment in muddy water, and discharges the supernatant to the outside of the groove; and when the groove is used as a water channel, A structure for sediment sedimentation, comprising: an overflow opening closing member for closing.   The sediment sediment structure according to claim 1, further comprising a supernatant liquid discharge portion that receives the supernatant liquid discharged from the overflow port.   The structure for sediment sedimentation according to claim 2, wherein the supernatant liquid discharge part includes a cylindrical body having a hollow part through which the supernatant liquid flows.   The structure for sedimentation according to claim 3, wherein the cylindrical body is embedded in the ground.   The structure for sedimentation according to claim 2, wherein the supernatant liquid discharge part is formed by excavating the ground around the groove.   The structure for sedimentation according to any one of claims 1 to 5, wherein a front overflow port for allowing the supernatant liquid to overflow is formed in an upper part of the partition wall. A sedimentation basin construction method using the sediment sediment structure according to any one of claims 1 to 6,
A method for constructing a sedimentation basin, comprising a step of penetrating and forming an overflow port through which the supernatant liquid separated from soil and sand in muddy water is discharged to the outside of the groove at the upper part of the side wall constituting the groove. A waterway recovery method for recovering a sedimentation basin constructed by the sedimentation basin construction method according to claim 7 to a waterway,
A waterway recovery method comprising: removing earth and sand accumulated in the groove; and closing the overflow port with an overflow port closing member to restore the side wall.

Images