Capture body and weir

Abstract

To provide a technique capable of capturing boulders by sufficiently absorbing collision energy in the entire capturing body, even in the case where boulders beyond assumption have collided.SOLUTION: A capturing body 1 which captures objects flowing down from the upstream of a river includes: a plurality of first column parts 10 installed at a predetermined interval with each other in a width direction of the river so as to incline toward the upstream side of the river from a base end part toward a tip part; a plurality of second column parts 20 installed at a predetermined interval in the same arrangement direction as the first column parts 10 so as to intersect with an extension direction of the first column parts 10 by inclining to the opposite side from the first column parts 10 from the base end part toward the tip part; a plurality of third column parts 30 installed at a predetermined interval in the same arrangement direction as the first column parts 10 by inclining to the same side as the second column parts 20 from the base end part toward the tip part so as to intersect with the extension direction of the first column parts 10, and on the opposite side from the first column parts 10 with respect to the second column parts 20; and column connection parts 90 for connecting the second column parts 20 and the third column parts 30 with each other.SELECTED DRAWING: Figure 2A

Description

Technical Field

[0001] The present invention relates to a capturing body and a dike.

Background Art

[0002] As a measure against debris flow or floating wood in a river including a stream, a permeable sand control dike provided in the width direction of the river in the river is known. The sand control dike allows water to pass through while suppressing objects such as rocks and floating wood contained in the debris flow from reaching the downstream area. In particular, in order to capture rocks and floating wood contained in the debris flow, a lattice-shaped steel dike provided with a capturing body in which steel pipe columns and steel pipe beams are combined in a three-dimensional lattice shape at an overflow section that allows water to pass through is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, with the intensification and frequent occurrence of sediment disasters, the impact of debris flow colliding with the capturing body tends to increase. The steel pipes of the capturing body are designed to absorb the impact energy by denting and deforming, for example, due to the collision of gravel contained in the debris flow.

[0005] However, with the intensification of sediment disasters, extremely large boulders that can exceed expectations may be washed by the debris flow and collide with the capturing body. In such a case, it is expected that the capturing body will deform more than it absorbs the impact energy. If the degree of deformation of the capturing body is not acceptable, repair or replacement of the capturing body will be necessary.

[0006] Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a technique capable of sufficiently absorbing collision energy in the entire capture body and capturing a boulder even when a boulder larger than expected collides.

Means for Solving the Problems

[0007] In order to solve the above problems, a capture body for capturing an object flowing from the upstream of a river according to the present invention includes a plurality of first column portions arranged at a predetermined interval in the width direction of the river so as to incline toward the upstream side of the river from the base end portion toward the tip end portion, a plurality of second column portions arranged at a predetermined interval in the same arrangement direction as the first column portions so as to incline toward the side opposite to the first column portion from the base end portion toward the tip end portion and intersect the extending direction of the first column portion, a plurality of third column portions arranged at a predetermined interval in the same arrangement direction as the first column portions so as to incline toward the same side as the second column portion from the base end portion toward the tip end portion, intersect the extending direction of the first column portion, and be on the side opposite to the first column portion with respect to the second column portion, and a column connecting portion that connects the second column portion and the third column portion to each other.

[0008] In one aspect of the capture body according to the present invention, the column connecting portion may be formed by the first column portion.

[0009] In one aspect of the capture body according to the present invention, the column connecting portion is characterized in that it extends in a truss shape between the second column portion and the third column portion.

[0010] In one aspect of the capture body according to the present invention, the column connecting portion may be formed by extending from each of the second column portion and the third column portion so as to be substantially orthogonal to the respective extending directions.

[0011] In addition, in one aspect of the capture body of the present invention, a lattice-shaped capture surface formed by a plurality of beam portions extending intersecting the second column portions so as to connect the second column portions to each other, and a lattice-shaped capture surface formed by a plurality of beam portions extending intersecting the third column portions so as to connect the third column portions to each other may be provided.

[0012] In addition, in one aspect of the capture body of the present invention, the second column portion, the third column portion, the beam portion intersecting the second column portion, and the beam portion intersecting the third column portion are each formed of a steel pipe, and the wall thickness of the steel pipe in the second column portion and the beam portion connecting the second column portions may be larger than the wall thickness of the steel pipe in the third column portion and the beam portion intersecting the third column portions.

[0013] In addition, in one aspect of the capture body according to one aspect of the present invention, the tip portions of the second column portion and the third column portion are each connected by the beam portion, and a plurality of steel pipes provided at a predetermined interval along the beam portion may be further provided between the beam portion at the tip portion of the second column portion and the beam portion at the tip portion of the third column portion.

[0014] In addition, in one aspect of the capture body according to one aspect of the present invention, a steel pipe connecting the tip portions of the second column portion and the third column portion to each other may be further provided.

[0015] In addition, in one aspect of the capture body according to one aspect of the present invention, a steel pipe extending inclined toward the base end portion of the second column portion may be further provided on the surface of the second column portion facing the side opposite to the third column portion.

[0016] Furthermore, in order to solve the above problems, the dike according to the present invention includes a non-overflow portion extending from both banks of a river, an overflow portion provided between the non-overflow portions, and a capturing body provided in the overflow portion for capturing an object flowing from the upstream of the river. The capturing body includes a plurality of first column portions arranged at a predetermined interval in the width direction of the river so as to be inclined toward the upstream side of the river from the base end portion toward the tip end portion, a plurality of second column portions arranged at a predetermined interval in the same arrangement direction as the first column portions so as to be inclined toward the side opposite to the first column portions from the base end portion toward the tip end portion and intersect the extending direction of the first column portions, and a plurality of third column portions arranged at a predetermined interval in the same arrangement direction as the first column portions so as to be inclined toward the same side as the second column portions from the base end portion toward the tip end portion, intersect the extending direction of the first column portions, and be on the side opposite to the first column portions with respect to the second column portions, and a column connecting portion connecting the second column portions and the third column portions to each other.

Advantages of the Invention

[0017] According to the present invention, even when boulders larger than expected collide, the capturing body can sufficiently absorb the collision energy as a whole and capture the boulders.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2A

Figure 2B

Figure 2C

Figure 3A

Figure 3B

Figure 4

Figure 5A

Figure 5B

Figure 6A

Figure 6B

Mode for Carrying Out the Invention

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that in the following description, the drawings are schematic, and it is necessary to pay attention to the fact that the dimensional relationships of each element, the ratios of each element, etc. may be different from the actual ones. There may also be parts where the dimensional relationships and ratios are different between the drawings.

[0020] <Embodiment 1> The sand control dike 100 is installed in a river including a mountain stream or the like, and dams up objects including sediment, driftwood, and rocks (gravel) flowing from upstream. FIG. 1 is a perspective view of the sand control dike 100 including the capture body 1 according to Embodiment 1.

[0021] [Sand control dike] The sand control dike 100 according to Embodiment 1 includes a pair of non-overflow parts 110, an overflow part 120, and a capture body 1.

[0022] (Non-overflow part) The non-overflow part 110 is a wall part extending from both banks of the river toward the center of the river. The bottom of the non-overflow part 110 is buried in the ground, and it is constructed so as to extend along the width direction of the river so as to cross the river. The non-overflow part 110 is constructed of, for example, concrete or soil cement. In the non-overflow part 110, the wall surface 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 inside thereof may be filled with concrete or soil cement.

[0023] (Overflow section) The overflow section 120 is a part where the non - overflow sections 110 are spaced apart at a predetermined interval in the width direction of the river. The overflow section 120 has an opening 121 and a water passage section 122. The opening 121 is the part where the capture body 1 described later is installed. In the opening 121, sediment, driftwood, rocks, etc. flowing from the upstream are captured.

[0024] The water passage section 122 is located above the opening 121 in the height direction of the sand - prevention dike 100. Specifically, it is the part above the capture body 1 in the state where the capture body 1 is installed. The water passage section 122 has a function of flowing water from the upstream side to the downstream side when the opening 121 is blocked by, for example, sediment or driftwood.

[0025] (Capture body) FIG. 2A is a perspective view of the capture body 1 according to Embodiment 1 as viewed from the upstream side. FIG. 2B is a perspective view of the capture body 1 according to Embodiment 1 as viewed from the downstream side. FIG. 2C is a side view of the capture body 1 according to Embodiment 1 as viewed from the side. The capture body 1 captures an object flowing from the upstream of the river and allows the flowing water to pass through, and is provided in the overflow section 120 between the non - overflow sections 110. The capture body 1 according to Embodiment 1 is a capture body that captures an object flowing from the upstream of the river, and a plurality of first column portions 10 are installed at a predetermined interval in the width direction of the river so as to be inclined upstream from the base end portion toward the tip end portion, a plurality of second column portions 20 are inclined downstream from the base end portion toward the tip end portion and are installed at a predetermined interval in the width direction of the river so as to intersect the extending direction of the first column portions 10, a plurality of third column portions 30 are inclined downstream from the base end portion toward the tip end portion, intersect the extending direction of the first column portions 10, and are installed at a predetermined interval in the width direction of the river on the upstream side with respect to the second column portions 20, and column connecting portions 80, 90 that connect the second column portions 20 and the third column portions 30 to each other. The column connecting portions 80, 90 are formed by the first column portions 10. Hereinafter, the configuration of the capture body 1 will be specifically described.

[0026] The capture body 1 is provided at the bottom 121a of the opening 121 of the overflow section 120 along the extending direction of the non-overflow section 110, that is, the width direction of the river. The capture body 1 has a plurality of column parts 10, 20, 30, beam parts 40, 50, 60, an extending part 70, and column connection parts 80, 90. The column parts 10, 20, 30 extend in the height direction of the sand prevention dike 100, and the beam parts 40, 50, 60 intersect the column parts 10, 20, 30 and extend in the width direction of the river.

[0027] Each of the column parts 10, 20, 30 has a plurality of steel pipe columns 11, 21, 31 respectively, and each of the beam parts 40, 50, 60 has a plurality of steel pipe beams 41, 51, 61. In this embodiment, each of the column parts 10, 20, 30 is configured as one steel pipe column by connecting a plurality of steel pipe members, and each of the beam parts 40, 50, 60 is configured as one steel pipe beam by connecting a plurality of steel pipe members. In one steel pipe member, a part constituting the column parts 10, 20, 30 and a part constituting the beam parts 40, 50, 60 may be integrally formed.

[0028] The column part (first column part) 10 extends obliquely upstream from the base end part on the side of the bottom 121a toward the tip end part. The column part 10 is formed of a steel pipe and has a plurality of three types of steel pipe columns 11, 12, 13 installed at different positions in the flow direction. The steel pipe columns 11, 12, 13 are installed at predetermined intervals from the downstream side to the upstream side.

[0029] Each of the steel pipe columns 11, 12, 13 is provided at a predetermined interval from each other along the width direction of the sand prevention dike 100 (the width direction of the river). In the flow direction of the river, each of the steel pipe columns 11, 12, 13 has axes x11, x12, x13 passing through their respective centers inclined by the same or substantially the same amount with respect to each other and provided parallel or substantially parallel to each other. Among the steel pipe columns 11, 12, 13, the steel pipe column 11 is located on the most downstream side with respect to the steel pipe columns 12, 13. The steel pipe column 12 is located on the downstream side with respect to the steel pipe column 13. The steel pipe column 11 is formed longer than the other steel pipe columns 12, 13, and the steel pipe column 12 is formed longer than the steel pipe column 13.

[0030] At its tip, the steel pipe column 11 is connected to the steel pipe column 21 that constitutes the column part 20 described later. At its tip, the steel pipe column 12 is connected to the steel pipe column 31 that constitutes the column part 30 described later. At its tip, the steel pipe column 13 is connected to the steel pipe column 31 that constitutes the column part 30 described later. The steel pipe columns 12 and 13 extend beyond the steel pipe column 21 upstream.

[0031] The position where the steel pipe column 12 is connected to the steel pipe column 31 is lower in the height direction than the position where the steel pipe column 11 is connected to the steel pipe column 21. The position where the steel pipe column 13 is connected to the steel pipe column 31 is lower in the height direction than the position where the steel pipe column 12 is connected to the steel pipe column 31. The steel pipe columns 12 and 13 function as part of the column connection part 90 that connects the two steel pipe columns 21 and 31 to each other between the steel pipe column 21 and the steel pipe column 31.

[0032] The steel pipe columns 11, 12, and 13 arranged in the flow direction are connected to each other by the beam parts 40. Each beam part 40 is configured as a steel pipe beam 41 formed by a steel pipe. The steel pipe beam 41 extends along the flow direction of the river. One end on the upstream side of the steel pipe beam 41 is connected to the steel pipe column 31 beyond the steel pipe column 21, and one end on the downstream side is connected to the steel pipe column 11.

[0033] The column part (second column part) 20 has six steel pipe columns 21 formed by steel pipes, which are arranged at a predetermined interval in the width direction of the sand control dike 100 (the width direction of the river), that is, in the same arrangement direction as the steel pipe columns 11, 12, and 13. Each steel pipe column 21 extends with its axis x21 passing through the center inclined downstream from the base end on the side of the bottom 121a toward the tip. The extending direction of the steel pipe column 21 intersects with the extending directions (axes x11, x12, x13) of the steel pipe columns 11, 12, and 13.

[0034] At the upper end of the steel pipe column 21, the steel pipe column 11 is connected in the height direction. The steel pipe column 12 intersects the steel pipe column 21 below the connection point with the steel pipe column 11, and the steel pipe column 13 intersects below the intersection point with the steel pipe column 12.

[0035] FIG. 3A is a plan view of the first capture surface 25 as viewed from the upstream side. The steel pipe columns 21 arranged in the width direction are connected to each other by the beam portions 50. Each beam portion 50 is configured as a steel pipe beam 51 formed by a steel pipe. The steel pipe beam 51 is provided at the tip of the upper end of the steel pipe column 21 and at four locations spaced at a predetermined interval along the steel pipe column 21 in the height direction from the tip. The steel pipe column 21 and the steel pipe beam 51 intersect each other to form a lattice-shaped first capture surface 25. The first capture surface 25 is configured to face directly in the river flow direction in the capture body 1.

[0036] Note that the number of steel pipe columns 21 installed in the width direction of the river is not particularly limited to six, and the number of steel pipe beams 51 installed in the height direction is not particularly limited to four locations. The number of steel pipe columns 21 and steel pipe beams 51 can be appropriately changed based on the scale of the sand control dike 100.

[0037] Returning to FIGS. 2A to 2C, the column portion (third column portion) 30 has six steel pipe columns 31 formed by steel pipes, which are arranged at a predetermined interval in the width direction of the sand control dike 100 (the width direction of the river), that is, in the same arrangement direction as the steel pipe columns 11, 12, 13, and 21. Each steel pipe column 31 extends with the axis x31 passing through the center inclined downstream from the base end portion on the side of the bottom 121a toward the tip. The extending direction of the steel pipe column 31 intersects the extending directions (x11, x12, x13) of the steel pipe columns 11, 12, 13. The steel pipe column 31 is provided at a predetermined interval upstream in the river flow direction with respect to the steel pipe column 21.

[0038] The steel pipe column 31 intersects the steel pipe column 12 and further intersects the steel pipe column 13 at a lower position in the height direction at the intersection with the steel pipe column 12. The extending direction (axis x31) of the steel pipe column 31 is parallel or substantially parallel to the extending direction (axis x21) of the steel pipe column 21.

[0039] FIG. 3B is a plan view of the second capture surface 35 as viewed from the upstream side. The steel pipe columns 31 arranged in the width direction are connected to each other by beam portions 60. Each beam portion 60 is configured as a steel pipe beam 61 formed of a steel pipe. The steel pipe beam 61 is provided at the tip of the upper end of the steel pipe column 31 and at eight locations spaced at a predetermined interval along the steel pipe column 31 in the height direction from the tip.

[0040] Note that the number of steel pipe columns 31 installed in the width direction of the river is not particularly limited to six, and the number of steel pipe beams 61 installed in the height direction is not particularly limited to eight. The number of steel pipe columns 31 and steel pipe beams 61 can be appropriately changed based on the scale of the sand control dike 100.

[0041] The steel pipe column 31 and the steel pipe beam 61 form a lattice-shaped second capture surface 35 that intersects each other. The second capture surface 35 is configured to face directly in the flow direction of the river in the capture body 1. The second capture surface 35 is located upstream of the first capture surface 25 in the flow direction of the river. In the second capture surface 35, more steel pipe beams 61 are installed than the steel pipe beams 51 in the first capture surface 25, so a lattice with a narrower interval than the first capture surface 25 is formed.

[0042] In the present embodiment, the diameters of the steel pipe columns 11, 12, 13, the steel pipe column 21, and the steel pipe column 31 are the same, but the wall thickness of the steel pipe column 21 is set larger than the wall thicknesses of the other steel pipe columns 11, 12, 13, and the steel pipe column 31.

[0043] The extension portion 70 extends downstream from the steel pipe column 21 and the steel pipe beam 51. The extension portion 70 has a plurality of extension steel pipes 71, 72 and a plurality of beam steel pipes 73. The extension steel pipes 71, 72 and the beam steel pipes 73 are formed of steel pipe materials.

[0044] The extended steel pipe 71 is provided on the side of the tip of the steel pipe column 21 in the height direction. The extended steel pipe 71 extends downward toward the downstream with respect to the horizontal direction of the river. The extended steel pipe 72 is provided between the steel pipe columns 21 at the uppermost steel pipe beam 51 in the height direction. The extended steel pipe 72 extends downward toward the downstream with respect to the horizontal direction of the river. The tips of the extended steel pipes 71 and 72 project at least downstream of the base ends of the steel pipe columns 11. The diameter of the extended steel pipe 71 is larger than the diameter of the extended steel pipe 72.

[0045] The beam steel pipe 73 is provided between the extended steel pipes 71. Between a pair of extended steel pipes 71, three beam steel pipes 73 are provided along the extending direction of the extended steel pipes 71. The beam steel pipe 73 is located below the extended steel pipe 72. Between the extended steel pipes 71, the extended steel pipe 72 and the beam steel pipe 73 are combined in a lattice shape.

[0046] FIG. 4 is a diagram for explaining the configurations of the column connection parts 80 and 90. The column connection parts 80 and 90 have the function of connecting the steel pipe columns 21 and 31 to each other. The column connection parts 80 and 90 connect the steel pipe column 21 and the steel pipe column 31 to each other at a plurality of locations from the tip ends to the base ends of the steel pipe columns 21 and 31.

[0047] The column connection part 80 is provided at the tip end of each of the steel pipe columns 21 and 31. The column connection part 80 has connecting steel pipes 81 and 82. The connecting steel pipes 81 and 82 extend horizontally or substantially horizontally in the flow direction. The connecting steel pipes 81 and 82 are respectively formed at the tip ends of the steel pipe columns 21 and 31. The connecting steel pipe 81 extends from the steel pipe column 21 toward the steel pipe column 31, and the connecting steel pipe 82 extends from the steel pipe column 31 toward the steel pipe column 21.

[0048] The column connection part 90 has connection steel pipes 91 and 92 respectively formed on the steel pipe columns 21 and 31. The connection steel pipe 91 is formed to extend from the steel pipe column 21 toward the steel pipe column 31 on the extension line of the steel pipe columns 12 and 13. The connection steel pipe 92 is formed to extend from the steel pipe column 31 toward the steel pipe column 21 on the extension line of the steel pipe columns 12 and 13. The connection steel pipe 91 functions as a part of the steel pipe columns 12 and 13, and the connection steel pipe 92 functions as a part of the steel pipe columns 12 and 13.

[0049] The connection steel pipes 81, 82, 91, and 92 each have a flange at their ends. By butting these flanges against each other and fastening them to each other with, for example, bolts or the like, the steel pipe columns 21 and 31 are connected to each other.

[0050] In the width direction of the river, a plurality of steel pipes 83 are provided between the column connection parts 80 provided at the tip ends of the steel pipe columns 21 and 31. The steel pipes 83 are provided between the steel pipe beams 51 and 61. One end of the steel pipe 83 is attached to the steel pipe beam 51, and the other end is spaced apart from the steel pipe beam 61. Note that one end of the steel pipe 83 may be attached to the steel pipe beam 61, and the other end may be spaced apart from the steel pipe beam 51. Note that the diameters of the connection steel pipes 81 and 82 are larger than the diameter of the steel pipe 83.

[0051] <Function of the capturing body> In the capturing body 1 according to the present embodiment, the allowable dent rate of the steel pipe column 21 and the steel pipe beam 51 on the first capturing surface 25 is set to, for example, 10% or less in design. Here, the "dent rate" is obtained by measuring the dent amount of the steel pipe columns 21 and 31 and the steel pipe beams 51 and 61 when the cross-sectional diameters of the damaged steel pipe columns 21 and 31 and the steel pipe beams 51 and 61 are measured with a caliper or the like, and is made dimensionless in terms of the diameters of the steel pipe columns 21 and 31 and the steel pipe beams 51 and 61.

[0052] The capture body 1 is designed to have a strength sufficient to satisfy the function as a capture body with only the first capture surface 25. However, for example, due to the intensification and frequency of earth and rock disasters, when a huge boulder larger than expected by the capture surface of the capture body collides with the capture body, impact energy exceeding what the capture body can absorb is applied to the capture body. As a result, the capture body will dent (deform) beyond the assumed dent rate, and it is assumed that it will be difficult for the capture body to cope with subsequent occurrences of debris flows and the like.

[0053] According to the capture body 1 according to the present embodiment, which includes the second capture surface 35 having the steel pipe columns 31 and the steel pipe beams 61 upstream of the first capture surface 25 having the steel pipe columns 21 and the steel pipe beams 51, the allowable dent rate of the steel pipe columns 31 and the steel pipe beams 61 on the second capture surface 35 is higher than that of the first capture surface 25, and is set to about 40% in design, for example.

[0054] As a result, in the capture body 1 according to the present embodiment, first, since huge boulders and the like collide with the second capture surface 35 having a high dent rate upstream of the first capture surface 25, the impact can be greatly buffered. Thereby, the impact energy absorbed by the first capture surface 25 that substantially functions as the capture body 1 can be greatly reduced.

[0055] According to the capture body 1 according to the first embodiment, for example, it becomes possible to propose a steel permeable sand control dam in a large and deserted stream with a large catchment area where severe disasters are expected. It is also possible to apply the capture body 1 provided with a plurality of steel pipe columns 11, 12, 13 having different lengths to, for example, a high dam with a dam height of 15 m or more.

[0056] Furthermore, since the first capture surface 25 and the second capture surface 35 are connected to each other by connecting steel pipes 81, 82, 91, 92 in the steel pipe columns 21, 31 facing each other in the flow direction, the strength of the entire capture body 1 is increased. Further, since a plurality of steel pipes 83 are provided from the steel pipe beam 51 toward the steel pipe beam 61, a roof is formed on the capture body 1 by the connecting steel pipes 81, 82 and the steel pipes 83. For example, it is possible to prevent sediment, gravel, etc. flowing over the capture body 1 from upstream to downstream from falling between the first capture surface 25 and the second capture surface 35. Also, the connecting steel pipes 81, 82 at the tip ends of the steel pipe columns 21, 31 can guide, for example, water, sediment, etc. flowing over the capture body 1 from upstream to downstream.

[0057] Furthermore, since the extending steel pipes 71, 72 and the beam steel pipe 73 extend obliquely downward from the steel pipe beam 51 and the beam steel pipe 73 extends between the extending steel pipes 71, for example, gravel, etc. that has flowed over the capture body 1 can be guided to fall at a position away from the capture body 1. Thereby, for example, it is possible to avoid gravel, etc. from contacting the steel pipe column 11 of the capture body 1 and damaging the steel pipe column 11.

[0058] <Embodiment 2> Next, the capture body 1A according to Embodiment 2 will be described. FIG. 5A is a side view of the capture body 1A according to Embodiment 2. In the following, the same components as those of the capture body 1 according to Embodiment 1 may be denoted by the same reference numerals and the description thereof may be omitted.

[0059] The capture body 1A according to Embodiment 2 is a capture body that captures an object flowing from the upstream of a river, and includes a plurality of first pillar portions 10 installed at a predetermined interval in the width direction of the river so as to be inclined upstream from the base end portion toward the tip end portion, a plurality of second pillar portions 20 installed at a predetermined interval in the width direction of the river so as to be inclined downstream from the base end portion toward the tip end portion and intersect the extending direction of the first pillar portions 10, and a plurality of third pillar portions 30 installed at a predetermined interval in the width direction of the river so as to be inclined downstream from the base end portion toward the tip end portion, intersect the extending direction of the first pillar portions 10, and be upstream of the second pillar portions 20, and a pillar connecting portion 90A that connects the second pillar portions 20 and the third pillar portions 30 to each other. The pillar connecting portion 90A is characterized by extending in a truss shape between the second pillar portions 20 and the third pillar portions 30. Hereinafter, the configuration of the capture body 1A will be specifically described.

[0060] The capture body 1A has a plurality of pillar portions 10, 20, 30, beam portions 40, 50, 60, an extension portion 70, and pillar connecting portions 80A, 90A. The pillar portions 10, 20, 30 extend in the height direction of the sand prevention dike 100, and the beam portions 40, 50, 60 intersect the pillar portions 10, 20, 30 and extend in the width direction of the river. Each of the pillar portions 10, 20, 30 has a plurality of steel pipe columns 11, 21, 31, and each of the beam portions 40, 50, 60 has a plurality of steel pipe beams 41, 51, 61. In this embodiment, each of the pillar portions 10, 20, 30 is configured as one steel pipe column by connecting a plurality of steel pipe members, and each of the beam portions 40, 50, 60 is configured as one steel pipe beam by connecting a plurality of steel pipe members. In one steel pipe member, a portion constituting the pillar portions 10, 20, 30 and a portion constituting the beam portions 40, 50, 60 may be integrally formed.

[0061] The pillar portion (first pillar portion) 10 extends while inclining upstream from the base end portion on the side of the bottom 121a toward the tip end portion. The pillar portion 10 is formed of a steel pipe and has a plurality of three types of steel pipe columns 11, 12, 13 installed at different positions in the flow direction. The steel pipe columns 11, 12, 13 are installed at a predetermined interval from the downstream side to the upstream side.

[0062] Each of the steel pipe columns 11, 12, and 13 is provided at a predetermined interval from each other along the width direction of the sand prevention dike 100 (the width direction of the river). Each of the steel pipe columns 11, 12, and 13 is provided parallel or substantially parallel to each other with axes x11, x12, and x13 passing through their respective centers inclined by the same or substantially the same amount with respect to the flow direction of the river. Among the steel pipe columns 11, 12, and 13, the steel pipe column 11 is located on the most downstream side with respect to the steel pipe columns 12 and 13. The steel pipe column 12 is located on the downstream side with respect to the steel pipe column 13. The steel pipe column 11 is formed longer than the other steel pipe columns 12 and 13, and the steel pipe column 12 is formed longer than the steel pipe column 13.

[0063] The steel pipe column 11 is connected at its tip to a steel pipe column 21 that constitutes a column part 20 described later. The steel pipe column 12 is connected at its tip to a steel pipe column 31 that constitutes a column part 30 described later. The steel pipe column 13 is connected at its tip to the steel pipe column 31 that constitutes the column part 30 described later. The steel pipe columns 12 and 13 extend beyond the steel pipe column 21 upstream.

[0064] The position where the steel pipe column 12 is connected to the steel pipe column 31 is lower in the height direction than the position where the steel pipe column 11 is connected to the steel pipe column 21. The position where the steel pipe column 13 is connected to the steel pipe column 31 is lower in the height direction than the position where the steel pipe column 12 is connected to the steel pipe column 31. The steel pipe columns 12 and 13 function as a part of a column connection part 90A that connects the two steel pipe columns 21 and 31 to each other between the steel pipe column 21 and the steel pipe column 31.

[0065] The steel pipe columns 11, 12, and 13 arranged in the flow direction are connected to each other by beam parts 40. Each beam part 40 is configured as a steel pipe beam 41 formed of a steel pipe. The steel pipe beam 41 extends along the flow direction of the river. One end on the upstream side of the steel pipe beam 41 is connected to the steel pipe column 31 beyond the steel pipe column 21, and one end on the downstream side is connected to the steel pipe column 11.

[0066] The column part (the second column part) 20 has a plurality of steel pipe columns 21 formed of steel pipes, which are arranged at a predetermined interval in the width direction of the sand prevention dike 100 (the width direction of the river), that is, in the same arrangement direction as the steel pipe columns 11, 12, and 13. Each steel pipe column 21 extends with the axis x21 passing through the center inclined downstream from the base end part on the side of the bottom part 121a toward the tip end part. The extending direction of the steel pipe column 21 is configured to intersect with the extending directions (axes x11, x12, x13) of the steel pipe columns 11, 12, and 13.

[0067] The upper end part of the steel pipe column 21 is connected to the steel pipe column 11 in the height direction. The steel pipe column 12 intersects the steel pipe column 21 below the connection location with the steel pipe column 11, and the steel pipe column 13 intersects further below the intersection location with the steel pipe column 12.

[0068] The steel pipe columns 21 arranged in the width direction are connected to each other by the beam part 50. Each beam part 50 is configured as a steel pipe beam 51 formed of a steel pipe. The steel pipe beam 51 is provided at the tip end part of the upper end of the steel pipe column 21 and at four locations at a predetermined interval along the steel pipe column 21 in the height direction from the tip end part. The steel pipe column 21 and the steel pipe beam 51 form a lattice-shaped first capture surface 25 that intersects with each other (see FIG. 3A). The first capture surface 25 is configured to face directly in the flow direction of the river in the capture body 1.

[0069] Note that the number of installed steel pipe columns 31 in the width direction of the river is not particularly limited to six, and the number of installed steel pipe beams 61 in the height direction is not particularly limited to eight locations. The number of installed steel pipe columns 31 and steel pipe beams 61 can be appropriately changed based on the scale of the sand prevention dike 100.

[0070] The column part (the third column part) 30 has a plurality of steel pipe columns 31 formed of steel pipes, which are arranged at a predetermined interval in the width direction of the sand control dike 100 (the width direction of the river), that is, in the same arrangement direction as the steel pipe columns 11, 12, 13 and the steel pipe column 21. Each steel pipe column 31 has an axis x31 passing through the center, which extends with an inclination toward the downstream side from the base end part on the side of the bottom part 121a toward the tip end part. The extending direction of the steel pipe column 31 is configured to intersect with the extending directions (x11, x12, x13) of the steel pipe columns 11, 12, 13. The steel pipe column 31 is provided at a predetermined interval upstream in the flow direction of the river with respect to the steel pipe column 21.

[0071] The steel pipe column 31 intersects with the steel pipe column 12 and further intersects with the steel pipe column 13 at a position lower in the height direction at the intersection with the steel pipe column 12. The extending direction (axis x31) of the steel pipe column 31 is parallel or substantially parallel to the extending direction (axis x21) of the steel pipe column 21.

[0072] The steel pipe columns 31 arranged in the width direction are connected to each other by the beam part 60. Each beam part 60 is configured as a steel pipe beam 61 formed of a steel pipe. The steel pipe beam 61 is provided at the tip end part of the upper end of the steel pipe column 31 and at eight locations provided at a predetermined interval along the steel pipe column 31 in the height direction from the tip end part.

[0073] Note that the number of installed steel pipe columns 31 in the width direction of the river is not particularly limited to six, and the number of installed steel pipe beams 61 in the height direction is not particularly limited to eight locations. The number of installed steel pipe columns 31 and steel pipe beams 61 can be appropriately changed based on the scale of the sand control dike 100.

[0074] The steel pipe column 31 and the steel pipe beam 61 form a lattice-shaped second capture surface 35 that intersects with each other (see FIG. 3B). The second capture surface 35 is configured to face directly in the flow direction of the river in the capture body 1. The second capture surface 35 is located upstream of the first capture surface 25 in the flow direction of the river. In the second capture surface 35, since more steel pipe beams 61 are installed than the steel pipe beams 51 in the first capture surface 25, a lattice with a narrower interval than the first capture surface 25 is formed.

[0075] In this embodiment, the diameters of the steel pipe columns 11, 12, 13, the steel pipe column 21, and the steel pipe column 31 are the same, but the wall thickness of the steel pipe column 21 is set to be larger than the wall thicknesses of the other steel pipe columns 11, 12, 13, and the steel pipe column 31.

[0076] The extension part 70 extends downstream from the steel pipe column 21 and the steel pipe beam 51. The extension part 70 has a plurality of extension steel pipes 71, 72 and a plurality of beam steel pipes 73. The extension steel pipes 71, 72 and the beam steel pipes 73 are formed of steel pipe materials.

[0077] The extension steel pipe 71 is provided on the side of the tip of the steel pipe column 21 in the height direction. The extension steel pipe 71 extends downward toward the downstream with respect to the horizontal direction of the river. The extension steel pipe 72 is provided between the steel pipe columns 21 at the uppermost steel pipe beam 51 in the height direction. The extension steel pipe 72 extends downward toward the downstream with respect to the horizontal direction of the river. The tips of the extension steel pipes 71, 72 protrude at least downstream of the base end of the steel pipe column 11. The diameter of the extension steel pipe 71 is larger than the diameter of the extension steel pipe 72.

[0078] The beam steel pipe 73 is provided between the extension steel pipes 71. Between a pair of extension steel pipes 71, three beam steel pipes 73 are provided along the extending direction of the extension steel pipes 71. The beam steel pipe 73 is located below the extension steel pipe 72. Between the extension steel pipes 71, the extension steel pipe 72 and the beam steel pipes 73 are combined in a lattice pattern.

[0079] FIG. 5B is a diagram for explaining the configuration of the column connection parts 80A, 90A of the capture body 1A according to the second embodiment. The column connection parts 80A, 90A have a function of connecting the steel pipe columns 21, 31 to each other. The column connection parts 80A, 90A connect the steel pipe column 21 and the steel pipe column 31 to each other at a plurality of locations from the tip to the base end of the steel pipe columns 21, 31.

[0080] The column connection part 80A is provided at the tip of each of the steel pipe columns 21 and 31. The column connection part 80A has connection steel pipes 81A and 82A. The connection steel pipes 81A and 82A extend horizontally or substantially horizontally in the flow direction. The connection steel pipes 81A and 82A are respectively formed at the tip of the steel pipe columns 21 and 31. The connection steel pipe 81A extends from the steel pipe column 21 toward the steel pipe column 31, and the connection steel pipe 82A extends from the steel pipe column 31 toward the steel pipe column 21.

[0081] The column connection part 90A connects the steel pipe columns 21 and 31 to each other in a truss shape. The column connection part 90A has connection steel pipes 91A and 92A respectively formed on the steel pipe columns 21 and 31. The connection steel pipe 91A is formed on the steel pipe column 21. Among the connection steel pipes 91A in the height direction, the connection steel pipe 91A formed on the uppermost side of the capture body 1A extends obliquely downward from the connection point between the steel pipe column 11 and the steel pipe column 21 toward the steel pipe column 31.

[0082] Among the connection steel pipes 91A in the height direction, the connection steel pipe 91A formed second from the top of the capture body 1A extends on the extension line of the steel pipe column 12. Among the connection steel pipes 91A in the height direction, the connection steel pipe 91A formed third from the top of the capture body 1A extends obliquely downward from the connection point between the steel pipe column 12 and the steel pipe column 21 toward the steel pipe column 31 on the upstream side. Among the connection steel pipes 91A in the height direction, the connection steel pipe 91A formed fourth from the top of the capture body 1A extends on the extension line of the steel pipe column 13. Some of the connection steel pipes 91A function as part of the steel pipe columns 12 and 13.

[0083] The connecting steel pipe 92A is formed on the steel pipe column 31. Among the connecting steel pipes 92A, the first and third connecting steel pipes 92A formed from above the capturing body 1A in the height direction extend obliquely upward toward the steel pipe column 21. Among the connecting steel pipes 92A, the second connecting steel pipe 92A formed from above the capturing body 1A in the height direction extends on the extension line of the steel pipe column 12. Among the connecting steel pipes 92A, the fourth connecting steel pipe 92A formed from above the capturing body 1A in the height direction extends on the extension line of the steel pipe column 13. Some of the connecting steel pipes 92A function as part of the steel pipe columns 12 and 13.

[0084] The connecting steel pipes 81A, 82A, 91A, and 92A each have a flange F. By butting these flanges F against each other and fastening them to each other with, for example, bolts or the like, the steel pipe columns 21 and 31 are connected to each other.

[0085] The first, second, third, and fourth connecting steel pipes 91A above the capturing body 1A in the height direction are respectively connected to the first, second, third, and fourth connecting steel pipes 92A above the capturing body 1A in the height direction. Thereby, a truss-shaped column connection part 91A is provided between the steel pipe column 21 and the steel pipe column 31.

[0086] The connecting steel pipes 91A and 92A are connected in a truss shape or a zigzag shape between the steel pipe column 21 and the steel pipe column 31. Thereby, a plurality of triangles are defined by the steel pipe column 21, the steel pipe column 31, and the connecting steel pipes 91A and 92A.

[0087] The capturing body 1A according to the second embodiment exhibits at least the same effects as the capturing body 1 according to the first embodiment. Furthermore, due to the connecting steel pipes 91A and 92A arranged in a truss shape, the capturing body 1A has high strength against impacts in the flow direction.

[0088] <Embodiment 3> FIG. 6A is a side view of the capture body 1B according to Embodiment 3. The capture body 1B captures an object flowing from the upstream of the river and allows the flowing water to pass through, and is provided in the overflow portion 120 between the non-overflow portions 110. In the following, the same components as those of the capture body 1 according to Embodiment 1 may be denoted by the same reference numerals and the description thereof may be omitted.

[0089] The capture body 1B according to Embodiment 3 is a capture body that captures an object flowing from the upstream of the river, and is installed at a predetermined interval in the width direction of the river so as to be inclined upstream from the base end portion toward the tip end portion. A plurality of first column portions 10, a plurality of second column portions 20 that are inclined downstream from the base end portion toward the tip end portion and are installed at a predetermined interval in the width direction of the river so as to intersect the extending direction of the first column portion 10, and a plurality of second column portions 20 that are inclined downstream from the base end portion toward the tip end portion and intersect the extending direction of the first column portion 10 and are upstream of the second column portion 20. A plurality of third column portions 30 installed at a predetermined interval in the width direction of the river, and a column connection portion 90B that connects the second column portion 20 and the third column portion 30 to each other. The column connection portion 90B is characterized in that it extends from each of the second column portion 20 and the third column portion 30 so as to be substantially orthogonal to the respective extending directions. Hereinafter, the configuration of the capture body 1B will be specifically described.

[0090] The capture body 1B is provided at the bottom 121a of the opening 121 of the overflow portion 110 along the extending direction of the non-overflow portion 110, that is, the width direction of the river. The capture body 1C has a plurality of column portions 10, 20, 30, beam portions 40, 50, 60, an extending portion 70, a ceiling portion 80B, and a column connection portion 90B. The column portions 10, 20, 30 extend in the height direction of the sand prevention dam 100, and the beam portions 40, 50, 60 intersect the column portions 10, 20, 30 and extend in the width direction of the river.

[0091] Each column part 10, 20, 30 has a plurality of steel pipe columns 11, 21, 31 respectively, and each beam part 40, 50, 60 has a plurality of steel pipe beams 41, 51, 61. In this embodiment, each column part 10, 20, 30 is constituted as one steel pipe column by connecting a plurality of steel pipe members, and each beam part 40, 50, 60 is constituted as one steel pipe beam by connecting a plurality of steel pipe members. In one steel pipe member, a part constituting the column parts 10, 20, 30 and a part constituting the beam parts 40, 50, 60 may be integrally formed.

[0092] The column part (first column part) 10 extends obliquely upstream from the base end part on the side of the bottom part 121a toward the tip end part. The column part 10 is formed of a steel pipe and has a plurality of three types of steel pipe columns 11, 12, 13 installed at different positions in the flow direction. The steel pipe columns 11, 12, 13 are installed at a predetermined interval from the downstream side to the upstream side.

[0093] Each of the steel pipe columns 11, 12, 13 is provided at a predetermined interval from each other along the width direction of the sand prevention dike 100 (the width direction of the river). In the flow direction of the river, the steel pipe columns 11, 12, 13 are provided parallel or substantially parallel to each other with axes x11, x12, x13 passing through their respective centers inclined by the same or substantially the same amount. Among the steel pipe columns 11, 12, 13, the steel pipe column 11 is located on the most downstream side with respect to the steel pipe columns 12, 13. The steel pipe column 12 is located on the downstream side with respect to the steel pipe column 13. The steel pipe column 11 is formed longer than the other steel pipe columns 12, 13, and the steel pipe column 12 is formed longer than the steel pipe column 13.

[0094] The steel pipe columns 11, 12, 13 are connected at their tip end parts to the steel pipe column 21 constituting the column part 20 described later.

[0095] The steel pipe columns 11, 12, and 13 arranged in the flow direction are connected to each other by the beam portions 40. Each beam portion 40 is configured as a steel pipe beam 41 formed of a steel pipe. The steel pipe beam 41 extends along the flow direction of the river. One end on the upstream side of the steel pipe beam 41 is connected to the steel pipe column 21, and one end on the downstream side is connected to the steel pipe column 11.

[0096] The column portion (second column portion) 20 has a plurality of steel pipe columns 21 formed of steel pipes, which are arranged at a predetermined interval in the width direction of the sand prevention dike 100 (the width direction of the river), that is, in the same arrangement direction as the steel pipe columns 11, 12, and 13. Each steel pipe column 21 has an axis x21 passing through the center inclined and extending downstream from the base end portion on the side of the bottom portion 121a toward the tip end portion. The extending direction of the steel pipe column 21 intersects with the extending directions (axes x11, x12, x13) of the steel pipe columns 11, 12, and 13.

[0097] The steel pipe column 11 is connected to the upper end portion of the steel pipe column 21 in the height direction. The steel pipe column 12 is connected to the steel pipe column 21 below the connection portion with the steel pipe column 11, and the steel pipe column 13 is connected further below the intersection portion with the steel pipe column 12.

[0098] The steel pipe columns 21 arranged in the width direction are connected to each other by the beam portions 50. Each beam portion 50 is configured as a steel pipe beam 51 formed of a steel pipe. The steel pipe beam 51 is provided at three locations at predetermined intervals along the steel pipe column 21 in the height direction from the tip end portion of the upper end of the steel pipe column 21 and from the tip end portion.

[0099] The steel pipe column 21 and the steel pipe beam 51 form a lattice-shaped first capture surface 25 that intersects with each other (see FIG. 3A). The first capture surface 25 faces directly in the flow direction of the river in the capture body 1. Note that the number of installed steel pipe columns 21 in the width direction of the river is not particularly limited to six, and the number of installed steel pipe beams 51 in the height direction is not particularly limited to four locations. The number of installed steel pipe columns 21 and steel pipe beams 51 can be appropriately changed based on the scale of the sand prevention dike 100.

[0100] The column part (the third column part) 30 has a plurality of steel pipe columns 31 formed of steel pipes, which are arranged at a predetermined interval in the width direction of the sand prevention dike 100 (the width direction of the river), that is, in the same arrangement direction as the steel pipe columns 11, 12, 13 and the steel pipe column 21. Each steel pipe column 31 extends with the axis x31 passing through the center inclined downstream from the base end on the side of the bottom 121a toward the tip end. The steel pipe column 31 is arranged such that its extending direction intersects the extending directions (x11, x12, x13) of the steel pipe columns 11, 12, 13. The steel pipe column 31 is provided at a predetermined interval upstream in the flow direction of the river with respect to the steel pipe column 21.

[0101] The extending direction (axis x31) of the steel pipe column 31 is parallel or substantially parallel to the extending direction (axis x21) of the steel pipe column 21.

[0102] The steel pipe columns 31 arranged in the width direction are connected to each other by the beam part 60. Each beam part 60 is configured as a steel pipe beam 61 formed of a steel pipe. The steel pipe beam 61 is provided at the tip end of the upper end of the steel pipe column 31 and at eight locations at predetermined intervals along the steel pipe column 31 in the height direction from the tip end.

[0103] Note that the number of installed steel pipe columns 31 in the width direction of the river is not particularly limited to six, and the number of installed steel pipe beams 61 in the height direction is not particularly limited to eight. The number of installed steel pipe columns 31 and steel pipe beams 61 can be appropriately changed based on the scale of the sand prevention dike 100.

[0104] The steel pipe column 31 and the steel pipe beam 61 form a lattice-shaped second capture surface 35 that intersects each other (see FIG. 3B). The second capture surface 35 is configured to face directly in the flow direction of the river in the capture body 1. The second capture surface 35 is located upstream of the first capture surface 25 in the flow direction of the river. In the second capture surface 35, more steel pipe beams 61 are installed than the steel pipe beams 51 in the first capture surface 25, so a lattice with a narrower interval than the first capture surface 25 is formed.

[0105] In the present embodiment, the diameters of the steel pipe columns 11, 12, 13, the steel pipe column 21, and the steel pipe column 31 are the same, but the wall thickness of the steel pipe column 21 is set to be larger than the wall thicknesses of the other steel pipe columns 11, 12, 13, and the steel pipe column 31.

[0106] The extension part 70 extends downstream from the steel pipe column 21 and the steel pipe beam 51. The extension part 70 has a plurality of extension steel pipes 71, 72 and a plurality of beam steel pipes 73. The extension steel pipes 71, 72 and the beam steel pipes 73 are formed of steel pipe materials.

[0107] The extension steel pipe 71 is provided on the side of the tip of the steel pipe column 21 in the height direction. The extension steel pipe 71 extends downward toward the downstream with respect to the horizontal direction of the river. The extension steel pipe 72 is provided between the steel pipe columns 21 in the uppermost steel pipe beam 51 in the height direction. The extension steel pipe 72 extends downward toward the downstream with respect to the horizontal direction of the river. The tips of the extension steel pipes 71, 72 project at least downstream of the base end of the steel pipe column 11. The diameter of the extension steel pipe 71 is larger than the diameter of the extension steel pipe 72.

[0108] The beam steel pipe 73 is provided between the extension steel pipes 71. Between the pair of extension steel pipes 71, three beam steel pipes 73 are provided along the extending direction of the extension steel pipes 71. The beam steel pipe 73 is located below the extension steel pipe 72. Between the extension steel pipes 71, the extension steel pipe 72 and the beam steel pipe 73 are combined in a lattice pattern.

[0109] The ceiling part 80B is provided at the tip of the steel pipe column 31. The ceiling part 80B is formed of a steel pipe. The ceiling part 80B extends horizontally or substantially horizontally in the flow direction. The ceiling part 80B extends from the steel pipe column 31 toward the steel pipe column 21. In the width direction of the river, a plurality of steel pipes (not shown) are provided between the ceiling parts 80B from the steel pipe beam 61 toward the steel pipe beam 51.

[0110] FIG. 6B is a diagram for explaining the configuration of the column connection part 90B of the capture body 1B according to Embodiment 3. The column connection part 90B has a function of connecting the steel pipe columns 21 and 31 to each other. The column connection part 90B connects the steel pipe column 21 and the steel pipe column 31 to each other at a plurality of locations from the tip end part to the base end part of the steel pipe columns 21 and 31.

[0111] The column connection part 90B has connecting steel pipes 91B and 92B respectively formed on the steel pipe columns 21 and 31. The connecting steel pipe 91B is formed on the steel pipe column 21. The connecting steel pipe 91B is provided at four locations along the extending direction of the steel pipe column 21. Each connecting steel pipe 91B protrudes upward from the steel pipe column 21 toward the steel pipe column 31. The connecting steel pipe 91B extends so as to be substantially orthogonal to the extending direction (axis x21) of the steel pipe column 21. Here, "substantially orthogonal" means that the angle at the connection part between the steel pipe column 21 and the connecting steel pipe 91B is a right angle with some error.

[0112] The connecting steel pipe 92B is provided at four locations along the extending direction of the steel pipe column 21. Each connecting steel pipe 92B protrudes downward from the steel pipe column 31 toward the steel pipe column 21. The connecting steel pipe 92B extends so as to be substantially orthogonal to the extending direction (axis x31) of the steel pipe column 31. Here, "substantially orthogonal" means that the angle at the connection part between the steel pipe column 21 and the connecting steel pipe 92B is a right angle or a right angle with some error.

[0113] The connecting steel pipes 91B and 92B each have a flange F. By butting the flanges F against each other and fastening them to each other with, for example, bolts or the like, the steel pipe columns 21 and 31 are connected to each other.

[0114] Since the connecting steel pipes 91B and 92B are substantially orthogonal to the steel pipe columns 21 and 31, the distance between the column part 20 and the column part 30 can be narrowed, and the gravel falling from the side of the ceiling part 80B can be restricted to those with a small gravel diameter. By preventing the fall of large-diameter gravel, the risk of damage to, for example, the column connection part 90B or the like below the ceiling part 80B is reduced, and the redundancy of the capture body 1B can be increased as a whole. Further, since the distance between the column part 20 and the column part 30 is narrow, the manufacture of the capture body 1B becomes relatively easy.

[0115] <Others> As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and includes all aspects included in the concept and claims of the present invention. Further, in order to achieve at least a part of the above-described problems and effects, each configuration may be appropriately and selectively combined. Further, for example, the shape, material, arrangement, size, etc. of each component in the above-described embodiment may be appropriately changed according to the specific usage mode of the present invention. In the above-described Embodiments 1, 2, and 3, the capture bodies 1, 1A, and 1B may be installed, for example, on the upstream side of an impermeable sand control levee in a sand-filled state, instead of the opening 121 of the permeable sand control levee 100.

[0116] Further, the column part 10 in Embodiments 1, 2, and 3 may be constituted by any one of the steel pipe columns 11, 12, and 13.

[0117] Further, although the axes passing through the centers of the steel pipe columns 21 and 31 in Embodiments 1, 2, and 3 are parallel and substantially parallel to each other, the base end part of the steel pipe column 31 may be separated from the steel pipe column 21. That is, the steel pipe column 31 may be installed so that the axis of the steel pipe column 21 and the axis of the steel pipe column 31 intersect each other.

Explanation of Reference Numerals

[0118] 1, 1A, 1B... Capture body 10... Column part (first column part) 11, 12, 13... Steel pipe column 20... Column part (second column part) 21... Steel pipe column 25…First capture surface 30…Column part (third column part) 31…Steel pipe column 35…Second capture surface 40…Beam part 41…Steel pipe beam 50…Beam part 51…Steel pipe beam 60…Beam part 61…Steel pipe beam 70…Extended part 71…Extended steel pipe 80, 80A, 90, 90A, 90B…Column connection part 81, 82, 81A, 82A, 91A, 91B, 92A, 92B…Connection steel pipe (steel pipe) 100…Sand prevention dike 110…Non - overflow part 120…Overflow part 121…Opening part 121a…Bottom part 122…Water passage part

Claims

1. A capturing body for capturing an object flowing from the upstream of a river, comprising: a plurality of first column parts arranged side by side at a predetermined interval in the width direction of the river so as to incline toward the upstream side of the river from the base end part toward the tip end part; a plurality of second column parts arranged side by side at a predetermined interval in the same arrangement direction as the first column parts so as to incline toward the side opposite to the first column parts from the base end part toward the tip end part and intersect the extending direction of the first column parts; a plurality of third column parts arranged side by side at a predetermined interval in the same arrangement direction as the first column parts so as to incline toward the same side as the second column parts from the base end part toward the tip end part, intersect the extending direction of the first column parts, and be on the side opposite to the first column parts with respect to the second column parts; a column connecting part for connecting the second column part and the third column part to each other; a lattice-shaped capturing surface formed by a plurality of beam parts extending across the second column parts so as to connect the second column parts to each other; a lattice-shaped capturing surface formed by a plurality of beam parts extending across the third column parts so as to connect the third column parts to each other; The capturing body is characterized by comprising the above.

2. The capturing body according to claim 1, wherein the column connecting part is formed by the first column part.

3. The capturing body according to claim 1 or 2, wherein the column connecting part is formed to extend in a truss shape between the second column part and the third column part.

4. The capturing body according to claim 1, wherein the column connecting part is formed to extend from each of the second column part and the third column part so as to be substantially orthogonal to the respective extending directions.

5. The second column part, the third column part, the beam part intersecting the second column part, and the beam part intersecting the third column part are each formed of a steel pipe, and the wall thickness of the steel pipe in the second column part and the beam part connecting the second column parts is larger than the wall thickness of the steel pipe in the third column part and the beam part intersecting the third column parts. The capturing body according to any one of claims 1 to 4.

6. The tip end parts of the second column part and the third column part are respectively connected by the beam part, The capture body according to any one of claims 1 to 5, further comprising a plurality of steel pipes provided at a predetermined interval along the beam portion between the beam portion at the tip of the second column portion and the beam portion at the tip of the third column portion.

7. The capture body according to any one of claims 1 to 4, further comprising a steel pipe connecting the tip of the second column portion and the tip of the third column portion to each other.

8. The capture body according to any one of claims 1 to 5, further comprising a steel pipe extending obliquely toward the base end portion of the second column portion on the surface of the second column portion facing the side opposite to the third column portion.

9. A capture body for capturing an object flowing from the upstream of a river, a plurality of first column portions arranged side by side at a predetermined interval in the width direction of the river so as to be inclined toward the upstream side of the river from the base end portion toward the tip end portion; a plurality of second column portions arranged side by side at a predetermined interval in the same arrangement direction as the first column portions so as to be inclined from the base end portion toward the tip end portion to the side opposite to the first column portions and intersect the extending direction of the first column portions; a plurality of third column portions arranged side by side at a predetermined interval in the same arrangement direction as the first column portions so as to be inclined from the base end portion toward the tip end portion to the same side as the second column portions, intersect the extending direction of the first column portions, and on the side opposite to the first column portions with respect to the second column portions; a column connecting portion connecting the second column portion and the third column portion to each other; a steel pipe extending obliquely toward the base end portion of the second column portion on the surface of the second column portion facing the side opposite to the third column portion; A capture body characterized by comprising.

10. Non-overflow portions extending from both banks of the river respectively; An overflow portion provided between the non-overflow portions; A capture body provided in the overflow portion for capturing an object flowing from the upstream of the river; Comprising, The capture body is a plurality of first column portions arranged side by side at a predetermined interval so as to be inclined toward the upstream side of the river from the base end portion toward the tip end portion; a plurality of second column portions arranged side by side at a predetermined interval in the same arrangement direction as the first column portions so as to be inclined from the base end portion toward the tip end portion to the side opposite to the first column portions and intersect the extending direction of the first column portions; A plurality of third column parts arranged side by side at a predetermined interval in the same arrangement direction as the first column part, inclined toward the same side as the second column part from the base end part toward the tip end part so as to intersect the extending direction of the first column part and on the side opposite to the first column part with respect to the second column part; A column connection part that connects the second column part and the third column part to each other; A lattice-shaped capture surface formed by a plurality of beam parts extending across the second column part so as to connect the second column parts to each other; A lattice-shaped capture surface formed by a plurality of beam parts extending across the third column part so as to connect the third column parts to each other; A weir characterized by having the above.

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