JP7133173B2 - Catches and Sabo dams - Google Patents

Description

TECHNICAL FIELD The present invention relates to a trap and a sabo dam.

BACKGROUND ART Sabo dams equipped with traps for trapping debris, driftwood, etc. flowing from upstream are known as river debris flow countermeasures. The Sabo dam has a pair of sleeves protruding from both banks of the river. An opening is provided between the sleeves to allow water to flow.
The trapping body is provided in the opening portion and traps earth and rocks, driftwood, etc. while allowing earth and sand and water to pass through. The trapping body is defined in a grid on the upstream side by the pillars and beams, and traps dirt, rocks, driftwood, and the like in the grid-like squares.
A technique is known in which a screen is provided on the upstream side of a trapping body in an erosion control dam to subdivide the grid-like squares of the trapping body. The screen is stretched between a pair of sleeves of the erosion control dam (see Patent Document 1, for example).

WO2017/149560

By the way, when the attachment portion of the erosion control dam to which the screen is attached is destroyed by debris, driftwood, etc., the screen will come off the erosion control dam, and the debris, driftwood, etc. will pass through the catcher and go downstream. There is a risk of being swept to the side.
Therefore, it is desirable that the installation portion of the screen is designed so as not to directly collide with debris, driftwood, etc. in the sabo dam.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and provides a sabo dam equipped with a catching body that prevents dirt, rocks, driftwood, etc. from directly colliding with a screen mounting portion. With the goal.

In order to solve the above-mentioned problems, a catching body according to the present invention includes a plurality of struts and horizontal members that are bridged between the plurality of struts, and allows running water flowing from the upstream of a river to pass through, and a catching body for catching driftwood, wherein both ends of the horizontal member are respectively turned from the upstream side to the downstream side of the pillars and are connected to the pillars on the downstream side of any of the pillars. and

Further, the struts to which the ends of the horizontal members are attached may have connecting members that connect the horizontal members in a region facing the adjacent struts and on the downstream side of the axial center thereof.

Also, an angle formed by a first straight line connecting the axial centers of adjacent struts and a second straight line connecting the axial centers of the struts on which the connecting members are provided and the downstream surface of the adjacent struts. is θ, the connecting portion between the connecting member and the horizontal member may be within a range forming an angle of 2θ formed on the downstream side from the first straight line.

Further, a second connecting member may be provided for connecting the ends of the horizontal members.

Further, an adjustment member may be provided between at least one end of the horizontal member and the support column, the length of which is adjustable.

Moreover, the strut may have a positioning member for positioning the cross member with respect to the strut.

Further, a plurality of vertical members may be provided that cross and span the plurality of horizontal members.

Furthermore, the erosion control dam according to the present invention for solving the above-mentioned problems comprises a pair of sleeves provided on both banks of a river, and the trapping body provided between the pair of sleeves. Characterized by

According to the present invention, since dirt, rocks, driftwood, etc. do not directly collide with the mounting portion of the screen, the mounting portion of the screen to the support can be protected from dirt, rocks, driftwood, and the like.

1 is a perspective view of an erosion control dam provided with a trapping body according to the present embodiment; FIG. FIG. 4 is a side view of the catching body according to the present embodiment; It is a figure for demonstrating the area|region in which a connection member is provided in an upstream support|pillar. FIG. 4 is a diagram for explaining the configuration of a connecting member attached to an upstream support column of a capture body according to the present embodiment; It is the figure which looked at the capture body which concerns on this Embodiment from the front. FIG. 4 is a diagram for explaining the configuration of a positioning member; Fig. 3 shows a panel of the screen; FIG. 4 is a schematic diagram showing a state in which the screen is attached to the capturing body; FIG. 5 shows where the vertical wires of the screen are attached to the upstream struts. It is the schematic for demonstrating the process of attaching a screen to a capture body. FIG. 10 is a diagram for explaining another connection mode of the horizontal wire to the trap;

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.

FIG. 1 is a perspective view of an erosion control dam 100 having a trap 2 according to this embodiment. The sabo dam 100 includes a pair of sleeves 1 and a catcher 2 . The sleeve portion 1 is made of concrete. A pair of sleeves 1 respectively extend from both banks of the river toward the center of the river. An opening 10 is formed between the pair of sleeves 1 with a predetermined gap therebetween.
A base portion 11 made of concrete is formed at the bottom of the opening portion 10 . The base portion 11 is formed in the river bed. River water, sand, pebbles, etc. flowing from upstream flow through the opening 10 .

The catcher 2 is placed on the base 11 at the opening 10 between the pair of sleeves 1 . The capture body 2 includes a support 20, a beam 40, and a screen 60.
The strut 20 is made of a circular steel pipe. Five pillars 20 are erected on the base portion 11 at predetermined intervals along the extending direction of the sabo dam 100 .
In this embodiment, the number of struts 20 is five, but the number of struts is not particularly limited, and can be changed as appropriate according to the scale of trapping bodies 2 to be installed.

FIG. 2 is a side view of capturing body 2 according to the present embodiment. The strut 20 has an upstream strut 21 erected on the upstream side and two downstream struts 22 and 23 erected on the downstream side. The upstream strut 21 and the downstream struts 22, 23 are connected to each other.
The column 20 includes both a column consisting of only the upstream column 21 and a column consisting of the upstream column 21 and the downstream columns 22 and 23 .

The upstream strut 21 obliquely extends from the upstream side toward the downstream side.
The two downstream struts 22, 23 have different lengths. Downstream strut 22 is shorter than downstream strut 23 . Both downstream struts 22, 23 extend obliquely from the downstream side to the upstream side. The downstream strut 22 is connected to an intermediate portion of the upstream strut 21 . The downstream strut 23 is connected to the vicinity of the upper end of the upstream strut 21 .
The downstream struts 22 and 23 are connected to the upstream struts 21 at both ends and the upstream strut 21 in the middle. The downstream struts 22 and 23 may be connected to all the upstream struts 21 .
The downstream strut 22 is positioned upstream with respect to the downstream strut 23 . The two downstream pillars 22 and 23 are connected by a connecting beam portion 30 . The connecting beam portion 30 extends in the flowing direction of the river.

FIG. 3 is a diagram for explaining a region 25 in which the connection member (first connection member) 24 is provided in the upstream strut 21. As shown in FIG. FIG. 4 is a diagram for explaining the configuration of the connecting member 24 attached to the upstream support pillar 21 of the capture body 2 according to this embodiment.
A connecting member 24 is provided on the middle upstream support column 21 among the five upstream support columns 21 . Horizontal wires (horizontal members) 62 of the screen 60 are connected to the upstream struts 21 via connecting members 24 at both ends. The connecting member 24 is provided in a region 25 facing the adjacent upstream support pillar 21 on the surface of the upstream support 21 on which the connecting member 24 is provided and on the downstream side of the axis x.

In the present embodiment, the horizontal wire 62 of the screen 60 is connected to the central upstream support column 21, but may be connected to other upstream support columns 21 than the central one. Also, each end portion of the horizontal wire 62 of the screen 60 may be connected to a different upstream strut 21 . In this case, the regions 25 are set in the two upstream struts 21 respectively, and each region 25 is provided with the connecting member 24 .

"Region 25" is formed downstream from virtual line v on the surface of upstream support column 21, where θ is the angle formed by virtual line (first straight line) v and tangential line (second straight line) t. is within the range of the angle 2θ
An imaginary line v is a straight line connecting the axial centers x of the upstream struts 21 when the capture body 2 is viewed on the upstream struts 21 from above. A tangent line t is a straight line that extends downstream from the axis x of the upstream support column 21 on which the connecting member 24 is provided toward the adjacent upstream support column 21 and touches the surface of the adjacent upstream support column 21 .

Both ends of the horizontal wire 62 are connected to the connecting member 24 . The connecting member 24 has a pair of brackets 26 , pin bolts 27 and elastic bodies 28 . A pair of brackets 26 are formed of a steel plate. Bracket 26 has a substantially semi-oval shape. The brackets 26 are welded to the region 25 of the upstream strut 21 with a predetermined distance from each other in the height direction. The end of the horizontal wire 62 is inserted between the pair of brackets 26 and connected.

Bracket 26 is provided in region 25 such that its center line m coincides with tangent line t. Note that the bracket 26 may be provided anywhere as long as the center line m thereof is within the region 25 and the connecting portion B, which will be described later, is within the range of 2θ.

Both ends of the pin bolt 27 are threaded. The thread of the pin bolt 27 is exposed to the outside of both brackets 26 when inserted through the through holes (not shown) of the pair of brackets 26 . Nuts N are fastened to threads formed on both ends of the pin bolt 27 exposed from the bracket 26 .

The elastic body 28 is made of an elastically deformable resin or rubber material. The elastic body 28 is formed in a cylindrical shape so that the pin bolt 27 penetrates. That is, the elastic body 28 surrounds the pin bolt 27 . This prevents the horizontal wire 62 from directly contacting the pin bolt 27 .

The horizontal wire 62 is connected to the connecting member 24 via the pin bolt 27 and the elastic body 28 . The pin bolt 27 and the elastic body 28 form a connecting portion B of the connecting member 24 with the horizontal wire 62 . The connecting portion B is within a range forming an angle of 2θ.

As long as the center line m of the bracket 26 in the connecting member 24 is within the region 25 and the connecting portion B is within the range forming an angle of 2θ, the force transmitted from the horizontal wire 62 to the bracket 26 is more tensile than the bending force. is greater. That is, within the range of the angle 25 and 2θ, the force transmitted from the horizontal wire 62 to the connection portion B of the connection member 24 is greater in tension than in bending.
As a result, when a load is applied to the horizontal wires 62 of the screen 60 , tensile force is preferentially transmitted to the brackets 26 of the connecting members 24 via the horizontal wires 62 . That is, the bending force that tends to bend the bracket 26 is suppressed. The bending force is the moment applied to the welded portion w of the bracket 26 .

FIG. 5 is a front view (upstream side) of the capture body 2 according to the present embodiment. FIG. 6 is a diagram for explaining the configuration of the positioning member 29. As shown in FIG.
A positioning member 29 is provided on the surface of the upstream support column 21 facing the upstream side. The positioning members 29 are spaced apart from each other by a predetermined distance between the position where the uppermost horizontal wire 62 of the screen 60 extends and the position where the lowermost horizontal wire 62 extends in the height direction of the catcher 2 . are provided. That is, a plurality of positioning members 29 are provided at positions where the horizontal wires 62 extend. The positioning member 29 prevents the horizontal wire 62 from shifting upward and downward in the height direction.
It should be noted that the positioning members 29 do not need to be provided at all the positions where the horizontal wires 62 extend on the upstream strut 21 as in the present embodiment, and the number of positioning members 29 to be installed can be appropriately selected. can be done.

The positioning member 29 is welded to the upstream strut 21 . The positioning member 29 has a pair of projecting plates 29a and a pin bolt 29b.
The pair of protruding plates 29a protrude upstream from the surface of the upstream support column 21 with a predetermined gap in the height direction. A through hole (not shown) is formed on the tip end side of the pair of protruding plates 29a on the side opposite to the upstream support column 21. As shown in FIG. A pin bolt 29b is inserted through each through hole. Nuts 29c are fastened to both ends of the pin bolt 29b.
The horizontal wire 62 is passed between the pin bolt 29b and the upstream strut 21 between the pair of projecting plates 29a. This prevents the horizontal wire 62 from slipping off the positioning member 29 to the upstream side.

Returning to FIG. 2, a plurality of positioning members 31 are provided on the surface of the upstream support pillar 21 facing the downstream side. The positioning member 31 is provided at a predetermined position where the horizontal wire 62 of the screen 60 extends in the height direction of the catcher 2 . Since the specific configuration and function of the positioning member 31 are the same as those of the positioning member 29, description thereof will be omitted.
The positioning members 31 may be provided at all positions where the horizontal wires 62 of the screen 60 extend in the height direction of the capturing body 2 .

A positioning member 32 is provided on the surface of the downstream support column 22 facing the downstream side. The positioning member 32 is provided at a position where the horizontal wire 62 of the screen 60 extends in the height direction of the catcher 2 . Since the specific configuration and function of the positioning member 32 are the same as those of the positioning member 29, description thereof will be omitted, but the positioning member 32 particularly prevents the horizontal wire 62 from rising (slipping) upward in the height direction. .

A positioning member 33 is provided on the surface of the downstream support column 23 facing the downstream side. The positioning member 33 is provided at a position where the horizontal wire 62 of the screen 60 extends in the height direction of the catcher 2 . Since the specific configuration and function of the positioning member 33 are the same as those of the positioning member 29, a description thereof will be omitted, but the positioning member 33 particularly prevents the horizontal wire 62 from rising (slipping) upward in the height direction. .

Returning to FIGS. 1 and 2, the beams 40 are made of steel pipes. The beam 40 extends between two upstream support columns 21 provided at both ends of the plurality of upstream support columns 21 . The beams 40 are arranged at predetermined intervals in the height direction of the capture body 2, such as the upper end of the upstream support 21, the vicinity of the connection between the upstream support 21 and the downstream support 23, and the upstream support 21 and the downstream support. 22 and near the lower end.

7A and 7B are diagrams showing panels 61 and 66 of the screen 60. FIG. FIG. 8 is a diagram showing a state in which the screen 60 is attached to the column 20. As shown in FIG.
The screen 60 has two panels 61,66. The screen 60 is attached to the upstream side of the catcher 2 . The panel 61 is provided above the panel 66 in the height direction of the capture body 2 (see FIG. 5).
The panel 61 has horizontal wires (horizontal members) 62 and vertical wires (longitudinal members) 63 . The horizontal wires 62 and the vertical wires 63 cross each other in a grid pattern and are woven together. The panel 61 is formed in a lattice shape by weaving one vertical wire 63 into a plurality of horizontal wires 62, and is also called a wire mokko.

A plurality of horizontal wires 62 are bridged between the plurality of upstream struts 21 at predetermined intervals along the height direction. Both ends of the horizontal wire 62 are formed with ring-shaped portions 62a. The vertical wires 63 are not woven into both end portions of the horizontal wires 62 . Both end portions of the horizontal wire 62 are turned from the upstream side to the downstream side of the struts 20 positioned at both ends of the trapping body 2 . Both end portions of the horizontal wire 62 are connected to the middle upstream strut 21 on the downstream side of the middle upstream strut 21 on which the connecting member 24 is provided at the annular portion 62a.

The length of the end portion of the transverse wire 62 varies depending on whether the transverse wire 62 is wrapped around the downstream struts 22,23. When the screen 60 is attached to the trap 2 , both ends of the horizontal wire 62 extending across the downstream struts 22 and 23 are connected to the horizontal wire 62 extending across only the upstream strut 21 . is formed longer than both end portions of the

Annular portions 62a provided at both ends of the horizontal wire 62 are connected to each other by steel connecting wires (second connecting members) 64. As shown in FIG. The connecting wire 64 prevents the horizontal wire 62 from being detached from the capturing body 2 when the connection between the horizontal wire 62 and the connecting member 24 is unintentionally released due to, for example, breakage of the connecting portion B of the connecting member 24. to prevent
The connecting wire 64 has annular portions 64a at both ends. In FIG. 8, the transverse wire 62 and the connecting wire 64 are depicted as being directly connected at their respective annular portions 62a, 64a, but are connected to each other by a connecting device such as a shackle.

FIG. 9(a) is an enlarged view showing a portion where the vertical wire 63 of the screen 60 is attached to the upstream support column 21. FIG. FIG. 9(b) is a view seen from the AA direction in FIG. 9(a).
In a state where the screen 60 is attached to the trap 2 , the vertical wires 63 extending along the upstream strut 21 are pressed against the upstream strut 21 by U-bolts 65 at multiple points. By preventing the vertical wire 63 from shifting in the width direction (horizontal direction) of the catcher 2, the entire panel 61 can be prevented from shifting in the width direction.

In the panel 61, the horizontal wires 62 and the vertical wires 63 are woven together, but the vertical wires 63 may be crossed over the horizontal wires 62 so as to bridge them. Moreover, if the space defined by the upstream support 21 and the beams 40 can be subdivided into spaces of a desired size, the panel 61 only needs to span the plurality of horizontal wires 62 over the upstream support 21. , the vertical wire 63 may not be provided.

Since the configuration of the panel 66 is the same as that of the panel 61, the explanation thereof is omitted. Panels 61 and 66 are connected to each other. The lowest horizontal wire 62 in the panel 61 and the highest horizontal wire in the panel 66 are preferably connected to each other by a predetermined connecting device (not shown). Note that the screen 60 may be formed by one panel.

10A and 10B are schematic diagrams for explaining the process of attaching the screen 60 to the capture body 2. FIG. The uppermost transverse wire 62 of the panel 61 is attached to the positioning member 29 at the upstream strut 21 . First, the horizontal wire 62 is installed between the projecting plates 29a of the positioning member 29, the pin bolt 29b is inserted through the projecting plate 29a, and the nut 29c is fastened to the pin bolt 29b. In this state, the horizontal wire 62 is positioned between the pin bolt 29b and the upstream strut 21. As shown in FIG. This makes it possible to easily position the panel 61 in the height direction.

Next, both end portions of the horizontal wire 62 are turned from the upstream side to the downstream side at the upstream struts 21 at both ends of the capturing body 2 and pulled toward the central upstream strut 21 where the connecting member 24 is provided. . In this case, if there is a positioning member 31, the horizontal wire 62 is installed on the positioning member 31 concerned.

Before inserting the annular portion 62a of the horizontal wire 62 between the pair of brackets 26, the elastic body 28 is put inside the annular portion 62a. An annular portion 62 a of the horizontal wire 62 is inserted between the pair of brackets 26 together with the elastic body 28 . The pin bolt 27 is passed through the through hole of one bracket 26 , the elastic body 28 is passed through, and one end of the pin bolt 27 is protruded through the through hole of the other bracket 26 .
Next, nuts N are fastened to threads formed on both ends of the pin bolt 27 . Thereby, the horizontal wire 62 is connected to the upstream strut 21 via the connecting member 24 .

After both ends of the horizontal wire 62 are connected to the upstream strut 21, the horizontal wire 62 and the connecting wire 64 are connected via shackles at the respective annular portions 62a and 64a. Thereby, both ends of the horizontal wire 62 are connected via the connecting wire 64 .
This operation is performed for all transverse wires 62 .

Next, the vertical wire 63 extending along the upstream strut 21 is fixed to the upstream strut 21 at an arbitrary position in the height direction via a U-bolt 65 . It should be noted that the vertical wires 63 do not have to be fixed to all the upstream struts 21, and the vertical wires 63 to be fixed are appropriately selected.

The work carried out on the panel 61 is also carried out when attaching the panel 66 to the trap 2 . After attaching the panel 66 to the trap 2, the lowest horizontal wire 62 of the panel 61 and the highest horizontal wire of the panel 66 are connected via a predetermined connecting device. This completes the attachment of the screen 60 to the capture body 2 .

According to the catching body 2 as described above, the horizontal wires 62 forming the screen 60 are connected to the upstream support pillars 21 of the catching body 2 on the downstream side. In other words, the attachment portion of the horizontal wire 62 to the upstream struts 21 is located downstream of the horizontal wire 62 that spans between the upstream struts 21 on the upstream side surface. As a result, for example, it is possible to avoid direct collision with the mounting portion of the horizontal wire 62 by debris, driftwood, or the like that is swept away when a debris flow occurs.
Moreover, it is also possible to attach the horizontal wires 62 of the screen 60 to an existing capture body that does not have the screen 60, and the work of retrofitting the horizontal wires 62 can also be performed relatively easily. For example, if the actual gravel diameter is smaller than the initially assumed gravel diameter and there is a discrepancy between the assumed gravel diameter and the actual gravel diameter, the installation interval of the horizontal wire 62 can be adjusted to be small. good. Moreover, when the actual gravel diameter is larger than the assumed gravel diameter, the installation interval of the horizontal wire 62 can be adjusted to be large. In the catcher 2, the screen 60 can be easily made to correspond to the actual gravel diameter.

Furthermore, the work of attaching the screen 60 to the trapping body 2 is easy, and for example, the work of removing the screen 60 during the work of removing debris and driftwood, etc. trapped by the trapping body 2 after the occurrence of a debris flow can also be performed by the connecting portion B. Since it is located on the downstream side, the connection between the horizontal wire 62 and the connecting member 24 can be easily released from the downstream side.

Also, when debris, driftwood, or the like collides with the screen 60 , the impact is transmitted to both ends of the horizontal wire 62 . Both ends of the horizontal wire 62 are connected to the upstream strut 21 via the connecting portion B of the connecting member 24 provided in the region 25 of the upstream strut 21, so that the tensile force is applied to the upstream strut 21 via the connecting portion B. It is transmitted to bracket 26 . As a result, tensile force is preferentially applied to the welding portion w of the bracket 26 of the upstream strut 21 rather than bending force, so that the load on the bracket 26 can be reduced.

Further, since the screen 60 has vertical wires 63 in addition to the horizontal wires 62, the space defined by the upstream support pillars 21 and the beams 40 in the capture body 2 can be subdivided into smaller debris, driftwood, etc. can be captured.

Further, in the screen 60, the horizontal wires 62 are attached to the positioning member 29, so that it is possible to prevent the screen 60 from shifting upward in the height direction.

<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. In the above embodiment, the horizontal wire 62 and the connecting member 24 are directly connected to each other, but they can also be connected indirectly.

11A and 11B are diagrams for explaining another connection mode of the horizontal wire 62 to the capturing body 2. FIG. It is not desirable for the horizontal wires 62 of the screen 60 to be connected to the upstream struts 21 under excessive tension from the viewpoint of absorbing impacts such as debris and driftwood.

Therefore, an adjusting member 7 whose length is adjustable is provided between one annular portion 62a of the horizontal wire 62 and the connecting member 24 of the upstream strut 21. As shown in FIG. The adjusting member 7 connects one annular portion 62 a of the horizontal wire 62 to the connecting member 24 of the upstream strut 21 .

The adjusting member 7 is formed, for example, like a turnbuckle whose axial length can be variably adjusted. The adjustment member 7 has two connecting bodies 71 and 72 and an intermediate body 73 . The connecting body 71 is connected to the connecting member 24 . The connector 72 is connected to the annular portion 62a of the transverse wire 62. As shown in FIG.
The connecting bodies 71 and 72 are connected to the intermediate body 73 by screwing. The expansion and contraction of the length of the adjusting member 7 is adjusted by relatively rotating the connecting bodies 71 and 72 and the intermediate body 73 .

The connector 71 has a threaded portion and a connecting portion. The connecting body 71 is screwed to the intermediate body 73 at the threaded portion. A connection portion of the connection body 71 is formed in a flat plate shape and is inserted between the pair of brackets 26 of the connection member 24 . A through hole is formed in the center of the connecting portion, and a pin bolt 27 is inserted through the through hole. Nuts N are fastened to both ends of the pin bolt 27 . Thereby, the connecting body 71 is connected to the connecting member 24 .

The connector 72 has a threaded portion and a connecting portion. The connecting body 72 is screwed to the intermediate body 73 at the threaded portion. The connecting portion is formed in an annular shape and is connected to the annular portion 62a at one end of the horizontal wire 62 via, for example, a shackle.

The adjustment member 7 allows the screen 60 to be attached to the capture body 2 while adjusting the tension of the horizontal wire 62 with respect to the upstream strut 21 .
In this embodiment, the transverse wire 62 is connected at one annular portion 62a to the connecting portion B of the connecting member 24 via the adjustment member 7, but both annular portions 62a of the transverse wire 62 are connected to the adjustment portion 62a. It may be connected to the connecting member 24 via the member 7 .

Reference Signs List 100 Sabo dam 1 Sleeve 2 Catcher 20 Support 21 Upstream support 22, 23 Downstream support 24 Connecting member (first connecting member)
25 region 29 positioning member 60 screen 62 horizontal wire (horizontal member)
63 longitudinal wire (longitudinal member)
64 connection wire (second connection member)
7 adjustment member B connecting portion v imaginary line (first straight line)
t tangent (second straight line)
x axis θ angle

Claims (8)

a plurality of pillars;
a horizontal member bridged between the plurality of struts;
A capture body that passes running water flowing from the upstream of a river and captures debris and driftwood,
A capture body, wherein both ends of said cross members are respectively turned from the upstream side to the downstream side of the struts and connected to the struts downstream of any of the struts. 2. The support according to claim 1, wherein the support to which the end of the cross member is attached has a connecting member that connects the cross support in a region downstream of the axis facing the adjacent support. capture body. θ is the angle formed by a first straight line connecting the axial centers of mutually adjacent struts and a second straight line connecting the axial centers of the struts on which the connecting members are provided and the downstream surface of the adjacent struts; and
3. The capturing body according to claim 2, wherein the connecting portion between the connecting member and the horizontal member is within a range forming an angle of 2[theta] formed on the downstream side from the first straight line. 4. A trap according to any one of claims 1 to 3, characterized in that it comprises a second connecting member for connecting the ends of the cross members. 5. According to any one of claims 1 to 4, characterized in that an adjustment member is provided between at least one end of said crosspiece and said strut, the length of which is adjustable. capture body. 6. A trap according to any one of claims 1 to 5, characterized in that the strut has a positioning member for positioning the cross member relative to the strut. 7. A trap according to any one of claims 1 to 6, comprising a plurality of vertical members crossing over said plurality of horizontal members. a pair of sleeves respectively provided on both banks of the river;
a capture body according to any one of claims 1 to 7 provided between the pair of sleeves;
An erosion control dam, characterized by comprising:

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