JP7112875B2 - Weirs and traps - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to dams and traps installed in rivers and the like.

In rivers in mountainous areas, dams are installed in order to prevent landslide disasters caused by typhoons and heavy rain (see, for example, Patent Document 1). A dam prevents the passage of rocks and driftwood contained in a debris flow while allowing water to pass through it. In recent years, in order to capture only rocks and driftwood without blocking the passage of water, a slit is formed in a part of the dam, and a fence-like capture body made of steel pipes is installed in this slit. A type dam has been constructed (see, for example, Patent Document 2).
In recent years, attempts have been made to newly install trapping bodies in the water passages of existing embankments that are not provided with trapping bodies in order to suppress damage caused by sediment disasters. As shown in FIG. 11 , in order to provide the trapping body 103 to the existing dam 100 , it is necessary to raise the sleeve portion 105 around the trapping body 103 in order to secure the water passage portion 104 . By raising the circumference of the capture body 103, as shown in FIG.
Further, as shown in FIG. 13, in the case of providing the capture body 111 to the existing dam 110 having a short bed width (width along the river flow direction), the upstream or downstream side of the water passage portion 112 of the dam 110 A trapping body 111 is provided using the bottom portion of the water passage portion 112 and the waist portion 113 .

Japanese Patent Publication No. 2-55566 JP 2015-63840 A

However, when the dam is raised, the external force of the debris flow acting on the walls of the dam also increases, so the strength of the dam becomes insufficient, and it takes time and money to improve the strength of the dam.
In addition, in so-called impermeable dams, in which trapping bodies are not provided, the width of the water passage is narrow in order to control the flow of water. It becomes easy to clog and overflow from the sleeve of the dam. As a result, not only is the trapping function of driftwood, etc. not sufficiently exhibited, but improvement work on the downstream side of the dam is required in preparation for overflow, which is costly and time consuming. On the other hand, it is also possible to expand the width of the water passage, but this also requires cost and time.
Moreover, even if the dam is provided with a widened portion, the construction work is costly and time consuming.
In addition, in order to fix the catcher to the existing embankment, the concrete for the catcher must be placed after the concrete for the water passage is poured. end up

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a dam in which a trap can be installed more easily than in the past, and the cost and time required for construction can be reduced.

In order to solve the above-mentioned problems, the present invention provides a dam having a water passage, which is provided on a wall surface on the upstream side facing at least the water passage, and captures objects flowing from the upstream and flows water. one end of which is fixed to the wall surface on the upstream side; It is characterized by comprising a plurality of pillars having erected portions erected at an obtuse angle on the wall surface side with respect to the extending direction of the legs.

In addition, it is preferable that the standing portion extends at least to a clearance height above the water surface at the estimated overflow water depth.

In addition, it is preferable that the erected portion extends from the leg portion to at least the clearance height at the shortest distance.

Further, the capturing body has one end attached to a first beam portion connecting the plurality of column portions to each other, the column portions at both ends in the width direction of the plurality of column portions, and the other end attached to the water passage. and a second beam attached to the wall surface on the upstream side on the side of the part.

Moreover, it is preferable that the first beam portion and the second beam portion are provided at a height position from the bottom surface of the water passage portion to the water surface at the assumed overflow water depth.

Moreover, it is preferable that the capturing body has a second standing portion extending downward on the second beam portion.

Further, the capture body has a third upright portion extending upward between the column portions at both ends in the width direction of the plurality of column portions and the wall surface on the upstream side. is preferred.

Moreover, it is preferable that the third erected portion extends at least to a clearance height from the water surface at an assumed overflow water depth.

Furthermore, in order to solve the above-mentioned problems, the present invention provides a dam having a water passage, wherein the wall surface of the dam on the upstream side faces at least the water passage, and driftwood flowing from the upstream is provided on the wall surface on the upstream side of the dam. and passing running water therethrough, wherein one end of the trapping body is fixed to the wall surface on the upstream side, and the trapping body includes a plurality of pillars that incline toward the upstream side as they go upward from the wall surface; It is characterized by comprising beam portions provided between the column portions at both ends in the width direction among the plurality of column portions and the wall surface on the upstream side on the side of the water passage portion.

Moreover, it is preferable that the capturing body has a standing portion extending upward with respect to the beam portion.

Moreover, it is preferable that the capture body has a standing portion extending downward from the beam portion.

Furthermore, in order to solve the above-mentioned problems, the present invention provides a catching body which is provided on the wall surface of the dam on the upstream side so as to face the water passage part of the dam, and which catches the driftwood flowing from the upstream and passes the flowing water. One end of which is fixed to the wall surface on the upstream side; It is characterized by comprising a plurality of pillars having erected portions erected at an obtuse angle on the wall surface side.

Furthermore, in order to solve the above-mentioned problems, the present invention provides a catching body which is provided on the wall surface of the dam on the upstream side so as to face the water passage part of the dam, and which catches the driftwood flowing from the upstream and passes the flowing water. a plurality of pillars having one end fixed to the wall surface on the upstream side and sloping toward the upstream side as it goes upward from the wall surface; and a beam portion provided between the wall surface on the upstream side on the side of the water passage portion.

In addition, it is preferable that the pillar has an erected portion erected from the other end of the pillar toward the wall surface at an obtuse angle with respect to the extending direction of the pillar.

Moreover, it is preferable that the beam has a standing portion extending upward with respect to the beam.

Moreover, it is preferable that the beam has a standing portion extending downward from the beam.

Moreover, it is preferable to have a beam portion that connects the plurality of pillar portions to each other.

ADVANTAGE OF THE INVENTION According to this invention, a trap can be installed more easily than before, and the cost and time which construction requires can be held down.

It is the front view which looked at the dam provided with the trap which concerns on one embodiment from the upstream. It is the perspective view which looked at the dam of FIG. 1 from the upstream. FIG. 2 is a plan view of the dam of FIG. 1; Figure 2 is a side view of the dam of Figure 1; FIG. 3 is a side view of the dam for explaining the state of the capture body when earth and sand are deposited on the upstream side of the dam of FIG. 1 ; In the river load section, (a) is a front view of the dam of FIG. 1 illustrating the state of trapping driftwood and allowing water to pass through, (b) is a side view of the dam, and (c) is a side view of the dam. It is a plan view of the dam. In a debris flow section of a river, (a) is a front view of the dam of FIG. 1 explaining the state of trapping driftwood and earth and sand and allowing water to pass through, (b) is a side view of the dam, and (c). is a plan view of the dam. FIG. 10 is a perspective view of a dam provided with trapping bodies according to another embodiment, viewed from the upstream side; FIG. 11 is a perspective view of a dam provided with trapping bodies according to still another embodiment, viewed from the upstream side; FIG. 11 is a perspective view of a dam provided with trapping bodies according to still another embodiment, viewed from the upstream side; In the prior art, (a) is a front view of a dam explaining a method of raising the dam to provide a trap, and (b) is a side view of the dam. In the prior art, (a) is a front view of the dam for explaining the state of trapping driftwood and allowing water to pass through the dam of FIG. 11, and (b) is a side view of the dam. In the prior art, it is a side view of the dam explaining the state which provided the bulge part for providing a catcher in the dam.

Preferred embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiment shown below is merely an example, and can take various forms within the scope of the present invention.
<Structure of dam>
As shown in FIGS. 1 to 4, the dam 1 includes a main body 2 and a catcher 3. As shown in FIGS. The dam 1 is obtained by newly installing a trapping body 3 on an existing main body 2 installed in a river to enhance the function of trapping (objects) such as driftwood and rocks.

(Body)
The main body 2 has its bottom buried in the ground and is constructed so as to extend along the width direction of the river so as to cross the river. The body 2 is constructed, for example, of concrete or soil cement. In addition, in the main body 2, the wall facing the upstream side or the downstream side of the river may be a steel plate wall formed by connecting a plurality of steel segments, and the interior thereof may be filled with concrete or soil cement.
In the vicinity of the center along the width direction of the river in the main body 2, that is, in the upper end portion between the sleeve portions 21 extending from both banks of the river on which the dam 1 is constructed to the center of the river, the upper end surface (top surface) is larger than the surroundings. A notched (recessed) water passage portion 22 is formed so that the end face) is lowered. The water passage part 22 is formed so as to concentrate the water flowing from upstream near the center of the main body 2 and allow it to flow downstream.
The main body 2 includes a sleeve portion 21 connected to both banks of the river, an upstream wall portion 23 facing the upstream side of the river, and a downstream wall portion 24 facing the downstream side of the river. Wall surfaces facing the upstream side and the downstream side of the sleeve portion 21 extend in the vertical direction. The upstream wall portion 23 is inclined upstream from the bottom surface 22a of the sleeve portion 21 or the water passage portion 22 as it goes downward. The downstream wall portion 24 is inclined downstream from the bottom surface 22a of the sleeve portion 21 or the water passage portion 22 as it goes downward.

(trapping body)
The catcher 3 catches an object flowing from the upper stream of the river and passes the running water, and is provided on the sleeve portion 21 and the upstream wall portion 23 of the main body 2 . The trapping body 3 is provided along the extending direction of the main body 2, that is, along the width direction of the river.
The capture body 3 is inclined upstream as it goes upward. The catcher 3 is provided on the main body 2 so that at least a portion thereof is positioned above the bottom surface 22 a of the water passage portion 22 of the main body 2 . The trapping body 3 includes a plurality of pillars 31 provided at predetermined intervals along the width direction of the main body 2 (the width direction of the river), and connecting beams (first beams) connecting the pillars 31 to each other. and a side beam portion (second beam portion) 33 provided between the column portion 31 and the sleeve portion 21 .
The capture body 3 is constructed such that the length L in the width direction is longer than the width W of the water passage portion 22 . The pillars 31 provided at both ends in the width direction (the width direction of the river) of the capturing body 3 are arranged at positions facing at least the sleeve portions 21 of the main body 2 .

The pillar portion 31 is made of, for example, a steel pipe. The column portion 31 includes a first leg portion 31a, a second leg portion 31b, and a standing portion 31c.
One end (lower end) of the first leg portion 31a is fixed to the upstream wall portion 23 of the main body 2 with an anchor bolt and a nut. The first leg portion 31a is connected to the connecting beam portion 32 near the other end (upper end). As a result, the pillars 31 are connected to each other by the connecting beams 32 . The first leg portion 31a is provided on the upstream wall portion 23 so as to be inclined upstream from one end fixed to the upstream wall portion 23 toward the other end.
In the height direction of the dam 1 , the other end of the first leg portion 31 a extends to at least a position facing the wall surface of the sleeve portion 21 on the upstream side.

One end of the second leg portion 31b is fixed to the upstream wall portion 23 of the main body 2 by an anchor bolt and a nut above one end of the first leg portion 31a. The other end of the second leg 31b is connected to the vicinity of the center in the longitudinal direction of the first leg 31a.
Here, if the second leg 31b is arranged along the slope of the riverbed on the upstream side, the force of the debris flow can be received along the axial direction of the second leg 31b. This is preferable because it is possible to reduce the force with which the leg portion 31b of the main body 2 is to be peeled off from the upstream wall portion 23 of the main body 2 . As a result, the first leg 31a and the second leg 31b of the column 31 are constructed to have a substantially λ-shape when viewed from the side, and the first leg 31a is wider than the second leg 31b. getting longer.
The interval S between the adjacent pillars 31 is half the length of the maximum driftwood that is assumed to flow in the river, or the length that corresponds to the diameter of the maximum gravel that is assumed to flow in the river. preferably.

One end of the standing portion 31c is connected to the other end (upper end) of the first leg portion 31a. The standing portion 31c is provided upward from the first leg portion 31a that extends obliquely to the upstream side so as to change the oblique extending direction of the column portion 31 to the vertical direction. Specifically, the standing portion 31c extends at an obtuse angle θ on the upstream wall portion 23 side with respect to the obliquely extending first leg portion 31a. In other words, the standing portion 31c faces the wall surface on the upstream side of the sleeve portion 21 of the main body 2 or extends substantially parallel to the wall surface on the upstream side of the sleeve portion 21 .

The connecting beam portion 32 is made of, for example, a steel pipe. The end portions of the connecting beam portions 32 are connected to the vicinity of the other end portions (upper end portions) of the first leg portions 31a provided at both ends in the width direction of the plurality of column portions 31, respectively.

The side beam portions 33 are provided between the sleeve portions 21 and the first leg portions 31a provided at both ends in the width direction of the plurality of column portions 31, and one end of the side beam portion 33 is connected to the first leg portion 31a. , and the other end is fixed to the sleeve portion 21 by an anchor bolt and a nut.
The connecting beam portion 32 and the side beam portion 33 are connected to the first leg portion 31 a at substantially the same height position in the height direction of the dam 1 . Specifically, it is preferable that the connecting beam portion 32 and the side beam portion 33 are provided at a height position including the water surface of the assumed running water 41 .

Further, the side beam portion 33 has a side standing portion (third standing portion) 33 a extending upward from the side beam portion 33 . The side erected portions 33a are erected so as to extend upward from the side beam portions 33 at predetermined intervals. exist. That is, the side standing portion 33a faces the wall surface on the upstream side of the sleeve portion 21 of the main body 2 or extends substantially parallel to the wall surface on the upstream side. It is preferable that the space S1 between adjacent side standing portions 33a is narrower than the space S between the standing portions 31c.

The capture body 3 is constructed to be longer than the width of the water passage portion 22 . The pillars 31 provided at both ends in the width direction (the width direction of the river) of the capturing body 3 are arranged at positions facing at least the main body 2 on the upstream wall portion 23 side. For example, the capture body 3 is installed so that three of the columns 31 on both end sides in the width direction face (cover) the main body 2 on the side of the water passage portion 22 in the width direction. ing.
In other words, when the interval S between the pillars 31 and 31 is 1 span, the capture body 3 is constructed so as to face the main body 2 by 2 spans. Of the two spans facing the main body 2 , at least a part of the one span on the side of the water passage portion 22 may face the main body 2 .
In addition, the range of the capture body 3 facing the main body 2 is, for example, 1 It can be appropriately changed so as to face the main body 2 by a span, three spans or more spans.

Here, the mounting positions of the erected portion 31c, the connecting beam portion 32, the side beam portion 33 and the side erected portion 33a in the trapping body 3 will be specifically described with reference to FIG.
The connecting beam portion 32 and the side beam portion 33 are provided at a height position including the water surface of the overflow water depth h1 assumed in the dam 1, and the standing portion 31c and the side standing portion 33a It extends to a position at least reaching the clearance height h2 at .
The “assumed overflow water depth h1” refers to the height of the water surface of the flowing water 41 that is assumed to flow through the water passage 22, that is, overflow the dam 1, to the bottom surface 22a of the water passage 22 here. is the distance of Also, the "clearance height" is a height set based on the overflow water depth h1.
The other end (upper end) of the side standing portion 33a extends to the same height position as the standing portion 31c. That is, the side erected portion 33a has a length dimension such that the other end (upper end) reaches the margin height h2 (m) from the side beam portion 33 at the shortest distance.

<Method of installing capture body>
Next, a method for installing the trapping body 3 when constructing the dam 1 by providing the trapping body 3 to the existing dam main body 2 will be described.
First, a hole is bored in the upstream wall portion 23 of the main body 2 at the installation position of the capturing body 3, an anchor bolt is embedded in the formed hole, and the hole is filled with mortar or the like to fix it.
Next, the first leg portion 31a, the second leg portion 31b, and the flange portion provided at one end of the side beam portion 33 are passed through the anchor bolt and fixed with a nut. Here, the trapping body 3 has a column portion 31, a connecting beam portion 32, and a side beam portion 33 each made of a steel pipe, which are joined in advance by welding or the like, and fixed with nuts while suspended by a crane or the like. Here, it is preferable that the length of the trapping body 3 in the width direction is at least longer than the width of the water passage portion 22 of the main body 2 .
Incidentally, when the trapping body 3 is provided on the main body 2 , the trapping body 3 is attached to the main body 2 so that a part of the trapping body 3 is positioned above the bottom surface 22 a of the water passage portion 22 of the main body 2 .
Through the steps described above, the trapping body 3 can be installed on the main body 2 of the existing dam, and the dam 1 with enhanced trapping function for driftwood and the like of the existing dam is constructed.

As described above, by providing the catcher 3 in the sleeve portion 21 and the upstream wall portion 23 of the main body 2 of the existing dam, it is possible to add the function of catching driftwood, earth and sand, etc. and reduce landslide disasters.
In addition, since the capture body 3 can be provided in the main body 2 in advance in anticipation of the occurrence of a debris flow due to a typhoon or heavy rain, landslide disasters can be prevented.

Here, if the trapping body is provided in the existing water passage, it is conventionally necessary to raise the height of the levee body in order to provide a new water passage. Since it is provided apart from the water passage part 22, there is no need to raise the main body 2, and improvement work for solving the lack of strength of the dam 1 is unnecessary.
In addition, since it is not necessary to perform improvement work on the downstream side of the dam 1 in preparation for overflow from the main body 2, widening work of the water passage part 22, or widening work, the construction cost can be reduced and the construction period can be shortened. can be done.
In addition, in order to raise the height of the main body 2 and install the trapping body 3, the existing main body 2 can be greatly increased without placing concrete for fixing the trapping body 3 after pouring concrete for the water passage part 22. No need to improve.
Therefore, the capturing body 3 can be installed on the main body 2 more easily than before, and the construction cost can be reduced and the construction period can be shortened.

In addition, since the catcher 3 is arranged to protrude above the bottom surface 22a of the water passage portion 22, as shown in FIG. Even if it is piled up, the trapping function of driftwood etc. can be maintained.
In addition, since the capture body 3 is provided with a portion facing the water passage portion 22 away from the water passage portion 22, the driftwood or the like can be caught before the driftwood or the like flows into the water passage portion 22. - 特許庁
In addition, since the second leg 31b is arranged along the slope of the ground (river bottom) on which the dam 1 is installed, the collision energy of driftwood or the like transmitted from the first leg 31a is distributed along the axial direction. Since it can receive, the force which the 2nd leg part 31b is going to peel off from the main body 2 can be minimized.

Here, if the installation location of the dam 1 is the load flow section of the river, as shown in FIG. led to. As a result, the water level raised by the accumulation of the driftwood 42 flows through the capture body 3 and then flows through the water passage portion 22 while lowering the water level, so that overflow from the sleeve portion 21 can be prevented. This eliminates the need to raise the dam 1. Therefore, the capturing body 3 can be installed so as to effectively capture the driftwood 42 without modifying the existing dam, and the cost and time required for construction can be suppressed.

On the other hand, if the dam 1 is installed in a debris flow section of a river, as shown in FIG. led to. As a result, the water level raised by the accumulation of driftwood 42 and earth and sand 43 flows through the capture body 3 and then flows through the water passage portion 22 while lowering the water level, thereby preventing overflow from the sleeve portion 21. This eliminates the need to raise the dam 1. Therefore, the capturing body 3 can be installed so as to effectively capture the driftwood 42 and the earth and sand 43 without modifying the existing dam, and the cost and time required for construction can be suppressed.

In addition, the column 31 of the capture body 3 forms an obtuse angle with respect to the first leg 31a on the upstream wall 23 side with respect to the first leg 31a which is inclined upstream as it goes upward. , and an erecting portion 31c erected in the vertical direction along the height direction of the dam 1 or the trapping body 3. As shown in FIG.
For example, if there is no standing portion 31c, it is necessary to extend the first leg portion 31a to at least the clearance height h2. When the first leg is extended to the clearance height h2, the first leg 31a extends obliquely, so the distance between the capture body 3 and the upstream wall 23 is increased. The widening of the distance between the trapping body 3 and the main body 2 leads to, for example, an enlargement of the area in which driftwood, earth and sand, etc., run around to the sides of the trapping body.

On the other hand, like the dam 1, by providing the first leg portion 31a with the vertically extending standing portion 31c, the standing portion 31c extending vertically from the other end of the first leg portion 31a is provided. The setting portion 31c reaches the clearance height h2 in the shortest distance. As a result, the distance between the capture body 3 and the main body 2 can be made smaller than when the first leg 31a reaches the clearance height h2.
Furthermore, for example, even if the driftwood or boulders caught by the trapping body 3 are deposited and try to climb up, the presence of the standing portion 31c prevents the driftwood or boulders from climbing over the trapping body 3. can. Thus, driftwood and boulders that have flowed are guided along the first leg portion 31a toward the lower side of the dam 1, and are pushed back by the erected portion 31c to further prevent driftwood and the like from overflowing. can be enhanced.

In addition, since the capture body 3 is provided with the side beams 33 at a height position including the water surface of the assumed overflow water depth h1, the flowing water flowing from upstream to downstream flows along the side beams 33. After colliding with the wall surface of the sleeve portion 21, the particles return upstream and are concentrated near the center of the main body 2 and flow downstream. As a result, it is possible to achieve the effect of preventing overflow caused by driftwood or the like from the side of the catcher 3 .
Furthermore, since the side beam portion 33 is provided with the side standing portion 33a, even if the amount of the running water 41 becomes unexpected and exceeds the side beam portion 33, the driftwood or the like will not be removed from the side standing portion 33a. Since it is captured, it is possible to more effectively prevent driftwood or the like from overflowing from the side of the capturing body 3 .

Moreover, since the length of the catcher 3 is longer than the width of the water passage portion 22, most of the driftwood or the like can be caught before the driftwood or the like flows into the water passage portion 22. - 特許庁Furthermore, when the trapping body 3 extends to a position facing the main body 2 in the width direction with respect to the water passage 22, the range of trapping driftwood and boulders that have flowed is widened in the width direction, and the trapping body Driftwood and boulders trying to go around from the side of 3 can be effectively captured.

<Others>
It should be noted that the present invention is not limited to the above-described embodiments, and can be appropriately modified within the scope of the present invention. For example, the structure of the capturing body can be freely changed as long as it has the function of capturing driftwood and boulders. In the above-described embodiment, the capture body 3 has the side beam portion 33 and the side standing portion 33a. However, for example, as shown in FIG. 8, the capture body includes at least a plurality of pillars 31 (first leg 31a, second leg 31b, and standing portion 31c), connecting beam 32, It may be a capture body 5 with Such a configuration particularly improves the catching function in front of the catching body 5. For example, when both banks of a river are in the vicinity of the catching body 5, the target to be captured can be caught from the front. driftwood or boulders.

In addition, in the above-described embodiment, the catcher 3 has the upright portion 31c and the side upright portion 33a. However, for example, as shown in FIG. 9, the trap includes at least a column portion 31 (a first leg portion 31a and a second leg portion 31b), a connecting beam portion 32 and side beam portions 33. Alternatively, it may be a capture body 6 . Such a configuration particularly improves the catching function of the catching body 6 on the side, and can reliably catch driftwood and boulders that come around from the side.
Incidentally, although not shown, the catcher 6 may be provided with an upright portion 31c or a side upright portion 33a. When the side standing portion 33a is provided, it is possible to more reliably catch driftwood and boulders that come around from the side.

Further, in the above-described embodiment, the side standing portion 33 a of the capture body 3 is provided on the side beam portion 33 . However, if the capture body 3 does not have the side beams 33, the side standing portions 33a may extend upward from the first leg 31a, the second leg 31b, etc., for example. good too.

Also, the configuration of the capture body 7 according to the modification will be described with reference to FIGS. Regarding the capture body 7, the configuration different from that of the capture bodies 3, 5, and 6 described above will be described, and the same configuration will be described using the same reference numerals, and the description thereof will be omitted.
The capture body 7 has a column portion 31 , a connecting beam portion 32 and side beam portions 33 . The side beam portion 33 of the capturing body 7 has a side standing portion 33a extending upward and a side standing portion 33b extending downward from the side beam portion 33 ( A second upright portion) is provided. The side upright portion 33b is provided at a position facing the side upright portion 33a.
The side upright portion 33b may extend, for example, between the side beam portion 33 and the second leg portion 31b, and the extension length of the side upright portion 33b is not particularly limited.

Moreover, the column portion 31 of the trapping body 7 has a first leg portion 31a, a second leg portion 31b, and a standing portion 31c. The obliquely upwardly extending first leg portion 31 a extends to a position slightly above the bottom surface 22 a of the water passage portion 22 . The erected portion 31c forms an obtuse angle θ on the upstream wall portion 23 side with respect to the obliquely extending first leg portion 31a from the vicinity of the bottom surface 22a of the water passage portion 22, and extends, for example, in the vertical direction. ing. The standing portion 31c extends in the height direction so as to face most of the water passage portion 22 .
The connection beam portion 32 has an end portion near the upper end portion of the standing portion 31c provided at both ends in the width direction of the plurality of standing portions 31c, and the water surface of the overflow water depth h1 assumed in the dam 1. connected to each other in the vicinity.

Due to the presence of the side standing portions 33b extending downward, for example, even if the overflow water surface falls below the overflow water depth h1 assumed at the dam 1, Driftwood or the like that tries to pass is captured.
In addition, since the erected portion 31c extends from the vicinity of the bottom surface 22a of the water passage portion 22, it is possible to suppress the first leg portion 31a from extending in the direction away from the main body 2. 7 and the upstream wall portion 23 can be suppressed from increasing.

In addition, although the side standing portions 33a and 33b of the trapping body 7 are provided to face each other vertically in the height direction, they may be provided along the side beam portion 33 so as to be offset from each other.
Note that the side standing portion 33b can also be applied to the trapping bodies 3 and 6. As shown in FIG.

Also, the method of fixing the trapping bodies 3, 5, 6, 7 to the main body 2 can be freely changed, as long as they are arranged in a position that satisfies the above conditions.
Moreover, the trapping bodies 3, 5, 6, and 7 are not limited to being attached to an existing embankment, and may be constructed together with the main body 2 when constructing the embankment.

Reference Signs List 1 dam 2 main body 21 sleeve portion 22 water passage portion 23 upstream wall portion 24 downstream wall portions 3, 5, 6, 7 capture body 31 column portion 31a first leg portion 31b second leg portion 31c standing portion 32 connecting beam Part (first beam)
33 side beam (second beam)
33a Side standing portion (third standing portion)
33b side standing portion (second standing portion)

Claims (10)

A dam having a water passage,
At least a trapping body provided on the wall surface on the upstream side facing the water passage part, trapping an object flowing from the upstream and passing the flowing water,
The capture body is
a leg portion having one end fixed to the wall surface on the upstream side and inclined toward the upstream side as it goes upward from the wall surface; A dam comprising a plurality of pillars each having an erected part erected at an obtuse angle. 2. The weir according to claim 1, wherein the standing portion extends at least to a freeboard above the water surface at an assumed overflow water depth. The weir according to claim 1 or 2, wherein the standing portion extends from the leg portion to at least the freeboard at the shortest distance. The capture body is
a first beam that connects the plurality of pillars to each other;
a second beam portion having one end attached to the column portions at both ends in the width direction among the plurality of column portions and having the other end attached to the wall surface on the upstream side on the side of the water passage portion;
A dam according to any one of claims 1 to 3, characterized in that it comprises a The dam according to claim 4, wherein the first beam portion and the second beam portion are provided at a height position from the bottom surface of the water passage portion to the water surface at an assumed overflow water depth. . The dam according to claim 4 or 5, wherein the trap has a second erected portion extending downward on the second beam portion. The capture body has a third upright portion extending upward between the column portions at both ends in the width direction of the plurality of column portions and the wall surface on the upstream side. Dam according to any one of claims 1 to 6. 8. The weir according to claim 7, wherein the third standing portion extends at least to a freeboard above the water surface at an assumed overflow water depth. A trapping body provided in a dam having a water passage part, provided at least on the wall surface on the upstream side of the dam facing the water passage part, capturing driftwood flowing from the upstream and passing the flowing water,
A leg part fixed to the wall surface on the upstream side at one end and sloping toward the upstream side as it goes upward from the wall surface; A catching body comprising a plurality of pillars each having a plurality of pillars each having an upright portion. 10. The catching body according to claim 9 , further comprising beams that connect the plurality of pillars to each other.

Images