Capturing body and dam

Abstract

To provide a capturing body improved in durability against temperature stress even where it is fixed on a foundation and a non-overflow part.SOLUTION: A capturing body (3) capturing objects included in flowing water as letting the flowing water flowing from an upstream of a river pass is provided with: an upstream side unit (6) arranged on an upstream side of the river, on which vertical members (61) and lateral members (62) are connected through tie members (63, 64); a downstream side unit (7) arranged on a downstream side of the river, on which vertical members (71) and lateral members (72) are connected through tie members (73, 74); and connection members (8) connecting the upstream side unit and the downstream side unit, wherein lower end parts of the upstream side unit and the downstream side unit in a vertical direction are fixed on a foundation (21) constructed on the river bed, end parts of the upstream side unit and the downstream side unit in a lateral direction are fixed on non-overflow parts (1) constructed on both sides of the capturing body in a river crossing direction, and at least part of the connected portions of the vertical members, the lateral members, and the tie members is configured as stress-relieving portions (67, 77).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a trap and a dam. [Background technology]

[0002] A well-known example of a river debris flow countermeasure is a dam (so-called permeable dam) equipped with a trapping body that captures rocks, driftwood, and other debris flowing from upstream. The dam has a pair of non-overflow sections that protrude from both sides of the river, with an opening between the non-overflow sections to allow water to pass through. The trapping body is installed in the opening and traps large-diameter rocks, driftwood, etc. while allowing small-diameter sediment and water to pass through. The trapping body is fixed to the foundation and the non-overflow section by having its lower vertical end buried in a foundation built in the riverbed and both horizontal ends buried in the non-overflow section (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-115480 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the above-mentioned trapping body is fixed to the foundation and non-overflow portion, it becomes vulnerable to temperature stress caused by changes in the ambient temperature, and it was necessary to improve the durability of the trapping body against temperature stress.

[0005] Therefore, the present invention has been made in consideration of the above-mentioned problems, and aims to provide a technology that can increase the durability against temperature stress even if the capture body is fixed to the foundation or non-overflow part. [Means for solving the problem]

[0006] One aspect of the present invention is a capture body that allows flowing water from upstream of a river to pass through and captures objects contained in the flowing water, and comprises an upstream unit that is provided on the upstream side of the river and has vertical members and horizontal members connected via connecting members, a downstream unit that is provided on the downstream side of the river and has vertical members and horizontal members connected via connecting members, and connecting members that connect the upstream unit and the downstream unit, wherein the lower vertical ends of the upstream unit and the downstream unit are fixed to a foundation constructed on the riverbed, and the horizontal ends of the upstream unit and the downstream unit are fixed to non-overflow sections constructed on both sides of the capture body in the direction across the river, and at least a portion of the vertical members, horizontal members and connecting members are configured as stress relief sections.

[0007] In the above aspect, it is preferable that the stress relief portion is provided between adjacent vertical members or between adjacent horizontal members and the connecting member.

[0008] In the above aspect, it is preferable that the stress relief portion is a gap formed between adjacent members.

[0009] In addition, in the above-mentioned aspect, the flanges provided at the connecting parts of the vertical members, the horizontal members and the connecting members are connected to each other by bolts and nuts, and it is preferable that the number of bolts and nuts in the stress relief parts is reduced compared to the other connecting parts.

[0010] In the above aspect, it is preferable that the stress relief portion is such that all of the bolts and nuts connecting the flanges to each other are removed.

[0011] In the above aspect, it is preferable that the stress relief portion is not connected in a state where adjacent members are butted against each other.

[0012] In addition, in the above-mentioned aspect, it is preferable that the flanges provided on the connecting parts of the vertical members, the horizontal members and the connecting members are connected to each other by bolts and nuts, and that the stress relief parts are connected to each other by pins.

[0013] In the above aspect, it is preferable that the downstream unit is bent so as to protrude toward the upstream side of the river.

[0014] In the above aspect, it is preferable that both the upstream unit and the downstream unit are bent so as to protrude toward the upstream side of the river.

[0015] One aspect of the present invention is a dam comprising a pair of non-overflow sections protruding from either side of a river, and the above-mentioned capture body provided in an opening between the pair of non-overflow sections. [Effects of the Invention]

[0016] According to one aspect of the present invention, durability against temperature stress can be increased even if the capture body is fixed to a foundation or a non-overflow portion. [Brief explanation of the drawings]

[0017] [Figure 1] This is a front view of the dam from the upstream side. [Figure 2] This is a front view of the dam from the downstream side. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 2 is a side view of the dam in FIG. 1, showing one of the non-overflow portions in a perspective view. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Preferred embodiments of the present invention will now be described with reference to the drawings.

[0019] <Dam configuration> 1 to 5, dam 100 is generally called a permeable dam and comprises a pair of non-overflow sections 1, an opening 2, a capture body 3, and a mount 4. In the following, the vertical direction refers to the height direction of dam 100 (depth direction of the river), and the horizontal direction refers to the width direction of dam 100 (width direction of the river) which is perpendicular to the height direction of dam 100.

[0020] The non-overflow sections 1 are, for example, walls made of concrete. The pair of non-overflow sections 1 extend from both banks of the river toward the center of the river, crossing the river. A predetermined gap is provided between the pair of non-overflow sections 1, and an opening 2 is formed therein. The non-overflow sections 1 are constructed by pouring concrete upward onto a foundation formed on the riverbed.

[0021] The opening 2 is a space formed between a pair of non-overflow sections 1, and a capture body 3 is installed therein. This allows large rocks and driftwood contained in the debris flow to be captured by the capture body 3, while allowing water, sand, small pebbles, etc. to pass through. A foundation 21 is formed at the bottom of the opening 2. The foundation 21 is formed on the riverbed and is made of, for example, concrete.

[0022] The trapping body 3 allows water flowing from upstream of the river to pass through while trapping objects such as large rocks and driftwood. At the opening 2, it is attached to the base 21 of the opening 2 and to the sides of the non-overflow section 1 on both sides of the river flow direction (both sides in the direction crossing the river). The trapping body 3 is used, for example, in a high dam. Here, a "high dam" refers to a dam whose height (dam height) from the riverbed (bottom) of the river on which the dam foundation is installed to the top of the trapping body 3 is 15 m or more. High dams are mainly installed in large rivers and rivers where large debris flows are predicted.

[0023] The capture body 3 includes an upstream unit 6, a downstream unit 7, and a connecting member 8. As shown in Figure 1, the upstream unit 6 is installed on the upstream side of the river and is a functional component that captures objects such as rocks and driftwood contained in a debris flow that has flowed down from the upstream side of the dam 100. In other words, the upstream unit 6 is the unit that is directly subjected to the impact of the debris flow. When the dam 100 is viewed from above, the upstream unit 6 is provided along the direction across the river (the width direction of the dam 100), and is curved so that its central portion in the width direction protrudes toward the upstream side of the river. In other words, the upstream unit 6 employs a curved arch structure, which reduces the composite stress of the upstream unit 6 due to temperature stress (internal stress that occurs in a structure due to temperature changes (for example, stress due to expansion and contraction of each component due to changes in outside temperature)). The upstream unit 6 is made up of a plurality of vertical members 61 and a plurality of horizontal members 62 connected via connecting members 63 and 64.

[0024] The multiple vertical members 61 are arranged along the height direction of the dam 100, and horizontal members 62 adjacent in the height direction are connected. The multiple vertical members 61 are arranged side by side along the width direction of the dam 100. It is preferable that the interval between adjacent vertical members 61 be smaller than the diameter of the rocks to be captured in the event of a debris flow. The vertical member 61 is formed, for example, from a cylindrical steel pipe (tube material) with a straight axis along the longitudinal direction. In the capture body 3, a plurality of vertical members 61 are arranged in the longitudinal direction. For example, the capture body 3 includes a plurality of types of vertical members 61 with different lengths.

[0025] Each vertical member 61 is provided with connecting members 63, 64 between its longitudinal ends, which connect it to the horizontal member 62. The connecting members 63, 64 are provided in pairs to the vertical member 61. Depending on the length of each vertical member 61, a plurality of connecting members 63, 64 are provided to one vertical member 61. The vertical members 61 are provided with a first connecting member 63 connecting one adjacent horizontal member 62 and a second connecting member 64 connecting the other adjacent horizontal member 62 between their longitudinal ends. The pair of first connecting member 63 and second connecting member 64 are provided at the same height. The first connecting member 63 and second connecting member 64 are, for example, cylindrical steel pipes (pipe members) with a straight axis along the longitudinal direction, and flanges (joints) provided at both ends of the steel pipes. The axes of the first connecting member 63 and second connecting member 64 extend in a direction perpendicular to the longitudinal direction (axial direction) of the vertical members 61, one end of which is joined to the vertical member 61 by welding or the like, and the other end of which is provided with a flange that connects to the horizontal member 62. One end of each of the first connecting member 63 and the second connecting member 64 may be connected to the vertical member 61 via a flange portion.

[0026] For example, in the capture body 3, the vertical member 611 arranged at the bottom has its lower end buried in the foundation 21, and a pair of connecting members 63, 64 are provided. In the capture body 3, the vertical members 612, 613 arranged in the second and third rows from the bottom are provided with two pairs of connecting members 63, 64. The vertical members 612 and 613 are formed to have the same length. In the capture body 3, the vertical members 614, 615 arranged in the fourth and fifth rows from the bottom are formed shorter than the vertical members 612, 613 arranged in the second and third rows from the bottom, and two pairs of connecting members 63, 64 are provided. The vertical members 614 and 615 are formed to be the same length. In the capture body 3, the vertical member 616 arranged in the sixth row from the bottom is formed shorter than the vertical members 614, 615 arranged in the fourth and fifth rows from the bottom, and a pair of connecting members 63, 64 are provided. In the capture body 3, the vertical member 617 arranged in the top row is formed shorter than the vertical member 616 arranged in the sixth row from the bottom, and a pair of connecting members 63, 64 are provided at the upper end of this vertical member 617.

[0027] The multiple horizontal members 62 are provided in a direction that crosses the river, and are arranged side by side along the height direction of the dam 100. The spacing between adjacent horizontal members 62 is preferably set smaller than the diameter of the rocks to be captured in the event of a debris flow. The spacing between adjacent horizontal members 62 may be the same from the top to the bottom of the capture body 3, or may be narrowed only above the capture body 3, and can be freely changed depending on the expected scale of the debris flow. The horizontal members 62 are, for example, cylindrical steel pipes (pipe materials) with a straight longitudinal axis, and flanges (joints) provided at both ends of the steel pipes. Each horizontal member 62 is connected to the flanges of first and second connecting members 63 and 64 provided on the vertical members 61 via the flanges provided at the longitudinal ends. Note that the horizontal members 62 may be connected by welding their ends together without providing flanges, but considering the need for replacement after a debris flow collision, connection using flanges is preferable. Of the cross members 62, the cross members 62 positioned outermost in the width direction of the river have one longitudinal end attached to the side wall of the opposing non-overflow section 1. Specifically, as shown in Figure 1, the ends of the cross members 62 are connected to the frame 4, and the frame 4 is buried in the non-overflow section 1, thereby fixing each cross member 62 to the non-overflow section 1. Auxiliary members 65 are connected to the horizontal members 62. The auxiliary members 65 are arranged so that their longitudinal direction is parallel to that of the vertical members 61, with one end connected to the horizontal members 62 and the other end buried in the foundation 21. The auxiliary members 65 firmly fix the upstream unit 6 to the foundation 21, and also narrow the gap between adjacent vertical members 61, thereby increasing the effect of capturing debris flow.

[0028] The upstream unit 6 is provided with a stress relief section 67 that relieves the temperature stress applied to the trap 3 due to temperature changes around the dam 100, thereby improving the durability of the trap 3 against temperature stress. 1 and 6, the stress relief portion 67 is provided between adjacent vertical members 61. Normally, adjacent vertical members 61 are butted together at the flange portions provided at the longitudinal ends of each vertical member 61, and the two flanges are connected with bolts and nuts, but in order to form the stress relief portion 67 between adjacent vertical members 61, no flange portions are provided at the ends of adjacent vertical members 61, and the vertical members 61 are arranged with a gap between the opposing ends, and the vertical members 61 are not connected to each other. In other words, this gap functions as the stress relief portion 67. In FIG. 1, stress relief portions 67 are provided between the upper end of vertical member 611 and the lower end of vertical member 612, between the upper end of vertical member 612 and the lower end of vertical member 613, between the upper end of vertical member 613 and the lower end of vertical member 614, between the upper end of vertical member 614 and the lower end of vertical member 615, between the upper end of vertical member 615 and the lower end of vertical member 616, and between the upper end of vertical member 616 and the lower end of vertical member 617. In addition, each vertical member 61 is connected to the horizontal member 62 by connecting members 63, 64, so that it will not fall off the capture body 3. In addition, although gaps as stress relief portions 67 are provided between all adjacent vertical members 61 in FIG. 1, they may be provided between some of the vertical members 61.

[0029] As shown in Figure 2, the downstream unit 7 is located downstream of the river from the upstream unit 6, and the impact load of the debris flow acting on the upstream unit 6 is transmitted via the connecting material 8, supporting the capture body 3. When the dam 100 is viewed from above, the downstream unit 7 is provided along the direction across the river (the width direction of the dam 100), and is formed so that its central portion in the width direction is bent and protrudes toward the upstream unit 6. In other words, the downstream unit 7 employs a curved arch structure, and is a structural member that uses compressive force to support the impact load of the debris flow transmitted from the upstream unit 6 via the connecting member 8. The downstream unit 7 is formed to extend along the upstream unit 6. The downstream unit 7 includes a plurality of vertical members 71 and a plurality of horizontal members 72 connected via connecting members 73 and 74 .

[0030] The multiple vertical members 71 are arranged along the height direction of the dam 100, and horizontal members 72 adjacent in the height direction are connected. The multiple vertical members 71 are arranged side by side along the width direction of the dam 100. The interval between adjacent vertical members 71 is preferably set smaller than the diameter of the rocks to be captured in the event of a debris flow. The vertical members 71 are formed, for example, from cylindrical steel pipes (tube materials) with a straight axis along the longitudinal direction. In the capture body 3, a plurality of vertical members 71 are arranged in the longitudinal direction. For example, the capture body 3 includes a plurality of types of vertical members 71 with different lengths.

[0031] Each vertical member 71 has connecting members 73, 74 between its longitudinal ends that connect it to the horizontal member 72. The connecting members 73, 74 are provided in pairs on the vertical member 71. Depending on the length of each vertical member 71, a plurality of connecting members 73, 74 are provided on one vertical member 71. The vertical members 71 are provided with a first connecting member 73 connecting one adjacent horizontal member 72 and a second connecting member 74 connecting the other adjacent horizontal member 72 between their longitudinal ends. The pair of first connecting member 73 and second connecting member 74 are provided at the same height. The first connecting member 73 and second connecting member 74 are, for example, cylindrical steel pipes (pipe members) with a straight axis along the longitudinal direction, and flanges (joints) provided at both ends of the steel pipes. The axes of the first connecting member 73 and second connecting member 74 extend in a direction perpendicular to the longitudinal direction (axial direction) of the vertical members 71, one end of which is joined to the vertical member 71 by welding or the like, and the other end of which is provided with a flange that connects to the horizontal member 72. One end of each of the first connecting member 73 and the second connecting member 74 may be connected to the vertical member 71 via a flange portion.

[0032] For example, in the capture body 3, the vertical member 711 arranged at the bottom has its lower end buried in the foundation 21, and a pair of connecting members 73, 74 are provided. In the capture body 3, the vertical member 712 arranged in the second tier from the bottom is formed shorter than the vertical member 711 arranged in the lowest tier, and a pair of connecting members 73, 74 are provided. In the capture body 3, the vertical member 713 arranged in the third row from the bottom is formed longer than the vertical member 712 arranged in the second row from the bottom, and two pairs of connecting members 73, 74 are provided. In the capture body 3, the vertical members 714, 715, and 716 arranged in the fourth to sixth rows from the bottom are formed shorter than the vertical member 713 arranged in the third row from the bottom, and two pairs of connecting members 73 and 74 are provided. The vertical members 714, 715, and 716 are formed to be the same length. In the capture body 3, the vertical member 717 arranged in the top row is formed shorter than the vertical member 716 arranged in the sixth row from the bottom, and a pair of connecting members 73, 74 are provided at the upper end of this vertical member 717.

[0033] The multiple horizontal members 72 are provided in a direction that crosses the river, and are arranged side by side along the height direction of the dam 100. The spacing between adjacent horizontal members 72 is preferably set smaller than the diameter of the rocks to be captured in the event of a debris flow. The spacing between adjacent horizontal members 72 may be the same from the top to the bottom of the capture body 3, or may be narrowed only above the capture body 3, and can be freely changed depending on the expected scale of the debris flow. The horizontal members 72 are, for example, cylindrical steel pipes (pipe materials) with a straight longitudinal axis, and flanges (joints) provided at both ends of the steel pipes. Each horizontal member 72 is connected to the flanges of first and second connecting members 73 and 74 provided on the vertical members 71 via the flanges provided at the longitudinal ends. Note that the horizontal members 72 may be connected by welding their ends together without providing flanges, but considering the need for replacement after a debris flow collision, connection using flanges is preferable. Of the cross members 72, the cross members 72 positioned outermost in the width direction of the river have one longitudinal end attached to the side wall of the opposing non-overflow section 1. Specifically, as shown in Figure 1, the ends of the cross members 72 are connected to a frame 4, and by embedding this frame 4 in the non-overflow section 1, each cross member 72 is fixed to the non-overflow section 1.

[0034] The downstream unit 7 is provided with a stress relief section 77 that relieves the temperature stress applied to the trap 3 due to temperature changes around the dam 100, thereby improving the durability of the trap 3 against temperature stress. 2 and 6, the stress relief portion 77 is provided between adjacent vertical members 71. Normally, adjacent vertical members 71 are butted together at the flange portions provided at the longitudinal ends of each vertical member 71, and the flanges are connected with bolts and nuts, but in order to form the stress relief portion 77 between adjacent vertical members 71, no flange portions are provided at the ends of adjacent vertical members 71, and the vertical members 71 are arranged with a gap between the opposing ends, and the vertical members 71 are not connected to each other. In other words, this gap functions as the stress relief portion 77. In Figure 2, stress relief portions 77 are provided between the upper end of vertical member 711 and the lower end of vertical member 712, between the upper end of vertical member 712 and the lower end of vertical member 713, between the upper end of vertical member 713 and the lower end of vertical member 714, between the upper end of vertical member 714 and the lower end of vertical member 715, between the upper end of vertical member 715 and the lower end of vertical member 716, and between the upper end of vertical member 716 and the lower end of vertical member 717. 3, the stress relief portions 77 are provided at a different height from the stress relief portions 67 of the upstream unit 6, except for the ends of the uppermost and lowermost vertical members 71. In other words, the stress relief portions 67 and 77 are provided so as not to be aligned in the horizontal direction. In addition, each vertical member 71 is connected to the horizontal member 72 by connecting members 73 and 74, so that it will not fall off the capture body 3. In addition, although gaps as stress relief portions 77 are provided between all adjacent vertical members 71 in FIG. 2, they may be provided between some of the vertical members 71.

[0035] As shown in FIGS. 3 to 5, the connecting member 8 connects the upstream unit 6 and the downstream unit 7 together. The connecting members 8 connect the opposing vertical members 61 (611-617) of the upstream unit 6 and the vertical members 71 (711-717) of the downstream unit 7. That is, the connecting members 8 are arranged side by side along the height direction of the dam 100, similar to the horizontal members 62, 72. Therefore, the spacing between adjacent connecting members 8 is set to be smaller than the diameter of the rocks to be captured in the event of a debris flow. Furthermore, similar to the horizontal members 62, 72, the spacing between adjacent connecting members 8 may be the same from the top to the bottom of the capture body 3, or may be narrowed only above the capture body 3, and can be freely changed depending on the expected scale of the debris flow. The connecting material 8 has a first connecting material 81, one end of which is connected to the vertical material 61 of the upstream unit 6 by welding or the like, and a second connecting material 82, one end of which is connected to the vertical material 71 of the downstream unit 7 by welding or the like. The first connecting member 81 has, for example, a cylindrical steel pipe (pipe material) with a straight axis along the longitudinal direction, and a flange portion (joint) provided at the other end of the steel pipe. The first connecting member 81 is connected to the vertical member 61 so that its axis is perpendicular to the axis of the vertical member 61. The first connecting member 81 is connected to the vertical member 61 so that its axis is perpendicular to the axes of each of the connecting members 63, 64. The second connecting member 82 has, for example, a cylindrical steel pipe (pipe material) with a straight axis along the longitudinal direction, and a flange portion (joint) provided at the other end of the steel pipe. The second connecting member 82 is connected to the vertical member 71 so that its axis is perpendicular to the axis of the vertical member 71. The second connecting member 82 is connected to the vertical member 71 so that its axis is perpendicular to the axes of each of the connecting members 73, 74. The first connecting member 81 and the second connecting member 82 are not necessarily connected using flange portions, but may be joined by welding or the like. Auxiliary members 83 extending in a direction intersecting the longitudinal direction of the horizontal members 62, 72 and the connecting member 8 are connected to the horizontal members 62, 72 and the connecting member 8 located at the top of the capture body 3, respectively. The auxiliary materials 83 prevent rocks and driftwood contained in the debris flow from falling between the upstream unit 6 and the downstream unit 7 of the capture body 3 toward the foundation 21. Note that the auxiliary materials 83 may be provided on the horizontal members 62, 72 and connecting members 8 other than those on the topmost level.

[0036] As shown in Figures 1 and 2, the platform 4 is erected on the foundation of the non-overflow section 1. The platform 4 is connected to the capture body 3, and when the dam 100 is completed, it will be buried in the non-overflow section 1 while still connected to the capture body 3. The mount 4 is used to firmly fix the capture body 3 to the non-overflow section 1. For each non-overflow section 1, the frame 4 is provided at a position facing the end of the cross member 62 of the upstream unit 6 and at a position facing the end of the cross member 72 of the downstream unit 7. Multiple frames 4 are connected along the height direction of the non-overflow section 1, and are provided at positions where each cross member 62, 72 of the capture body 3 can be connected. The mount 4 includes a plurality of vertical portions 41 and a plurality of horizontal portions 42. A plurality of vertical portions 41 are provided along the height direction of the dam 100. The vertical portions 41 are formed, for example, from cylindrical steel pipes with a straight axis along the longitudinal direction. Flanges are provided at both ends of the vertical portions 41. The axial ends of each vertical portion 41 are connected to each other via the flanges. The lowest vertical portion 41 is provided directly on the foundation of the non-overflow portion 1 and is buried in the foundation. As a result, the lower end of the frame 4 stands upright on the foundation. The horizontal portions 42 are arranged midway along the axial direction of the vertical portions 41 so as to intersect (orthogonally) with the vertical portions 41, and are arranged side by side along the height direction of the dam 100. The horizontal portions 42 are formed, for example, from cylindrical steel pipes whose longitudinal axes are straight. Each horizontal portion 42 is connected to the horizontal members 62, 72 of the capture body 3 via a flange provided at one end of the horizontal portion 42 in the axial direction. Each horizontal portion 42 is provided so as to penetrate some of the vertical portions 41 and is joined to the vertical portions 41 at their intersections. In other words, the frame 4 is configured as an integrated cross pipe having a generally cross shape when viewed from the front, in which the steel pipes constituting the vertical portions 41 and the steel pipes constituting the horizontal portions 42 are joined together. Each horizontal portion 42 is provided so that one longitudinal end portion is exposed to the opening 2 from the non-overflow portion 1, and is arranged so that this one end portion can be connected to the horizontal members 62, 72. The base 4 is buried in the non-overflow section 1 except for the connection portions between the horizontal members 62, 72 of the capture body 3 at the horizontal portion 42. By burying the base 4 in the non-overflow section 1, the ends of the horizontal members 62, 72 are fixed to the non-overflow section 1 via the base 4, and the capture body 3 is fixed to the side wall of the non-overflow section 1.

[0037] According to the above-described trap 3 and dam 100, the trap 3 in the dam 100 is embedded and fixed in the non-overflow section 1 and foundation 21, but at least a portion of the connecting portions of the vertical members 61, 71, horizontal members 62, 72, and connecting members 63, 64, 73, 74 that make up the trap 3 are configured as stress relief portions 67, 77, so that temperature stress due to changes in the ambient temperature can be released through the stress relief portions 67, 77, thereby increasing the durability of the trap 3 against temperature stress. This ensures the safety of the structure of the dam 100 when inspecting for temperature stress. Moreover, by releasing the temperature stress through the stress relief portions 67, 77, deformation of the capturing body 3 can be suppressed. Furthermore, by using the gaps between adjacent vertical members 61 as stress relief portions 67, 77, the stress relief portions 67, 77 can be easily constructed. Furthermore, the stress relief portions 67, 77 simply form gaps between adjacent vertical members 61, and therefore do not reduce the ability to capture rocks, boulders, and driftwood contained in debris flows. Furthermore, if the dam is a high dam, there is a difference in elevation between the upper and lower sections, and the lower section is often in contact with water, so the temperature changes of the members that make up the capture body 3 differ greatly between the upper and lower sections. Therefore, by providing stress relief sections 67, 77 in places where the temperature changes of the members are large, it is possible to minimize the difference in temperature changes in each height direction (each section).

[0038] <Modification> Next, modified examples of the stress relief portion of the capturing body 3 will be described. 7, a flange portion 61a is provided at each end of adjacent vertical members 61. The flange portions 61a are in contact with each other with their faces butted together, and are connected by a plurality of bolts 91 and nuts 92. The plurality of bolts 91 and nuts 92 are provided along the vicinity of the periphery of the flange portions 61a. Here, among the connecting portions between the flange portions 61a provided on the vertical members 61, at least some of the flange portions 61a have fewer bolts 91 and nuts 92 than connecting portions between the other flange portions 61a. As shown in FIG. 7, the flange portions 61a are connected to each other with twelve bolts 91 and nuts 92, but some of the flange portions 61a are connected to each other with four bolts 91 and nuts 92. In this way, the abutment surfaces of the flange portions 61a near the portions where the bolts 91 and nuts 92 have been removed function as stress relief portions 94 because the flange portions 61a are not connected to each other and allow for slight movement or misalignment. The number of bolts 91 and nuts 92 to be removed is arbitrary and can be changed depending on the capture body 3. Furthermore, the insertion holes of the bolts 91 in the flange portion 61a may be made large or elongated to allow slight movement or misalignment of the flange portion 61a, and may function as stress relief portions 94.

[0039] 7, all of the bolts 91 and nuts 92 connecting the flange portions 61a to each other may be removed, and the flange portions 61a may simply be brought into contact with each other as shown in FIG. 8. In other words, the adjacent flange portions 61a are simply butted together and are not connected to each other. In this way, all the bolts 91 and nuts 92 are removed, and the flange portions 61a are not connected to each other but are merely butted together in contact, allowing for slight movement or misalignment, so that the contact surfaces of the flange portions 61a function as stress relief portions 95.

[0040] 8, it is also possible to simply butt the end faces of the vertical members 61 together and bring them into contact with each other, as shown in Fig. 9, without providing flange portions 61a on adjacent vertical members 61. In other words, the adjacent vertical members 61 are simply butted together and are not connected to each other. In this way, the vertical members 61 are simply butted together and in contact with each other without providing the flange portion 61a necessary for connection, and slight movement or misalignment is permitted, so the contact surfaces of the vertical members 61 function as stress relief portions 96.

[0041] 7, the flange portions 61a provided on the vertical members 61 may not be connected to each other with bolts 91 and nuts 92, but may be connected to each other by passing pins 93 through bolt insertion holes formed in the flange portions 61a, as shown in FIG. 10. In other words, the adjacent flange portions 61a are only connected to each other in approximate positions and are not completely fixed to each other. In this way, unlike the bolt 91 and nut 92, the position is not fixed by connecting the flange portion 61a, and since there is a gap between the pin 93 and the inner wall of the bolt insertion hole, slight movement or misalignment is permitted, and the contact surface of the flange portion 61a functions as a stress relief portion 97. The number of pins 93 is optional and can be changed depending on the capturing body 3.

[0042] Furthermore, instead of providing stress relief portions at the connection portions of adjacent vertical members 61, as shown in Fig. 11, it is also possible to cut a part of the horizontal members 62, 72 to divide them into two, and then arrange the horizontal members 62, 72 so that there is a gap between the divided horizontal members 62, 72. In other words, this gap functions as a stress relief portion 98. The stress relief portions 98 may be provided at the connection portions between the horizontal members 62, 72 and the connecting members 63, 64, 73, 74, rather than in the middle of the horizontal members 62, 72.

[0043] <Other> Although the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments and includes all aspects encompassed within the concept and scope of the claims. Furthermore, each configuration may be appropriately and selectively combined to achieve at least some of the above-described problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiments may be appropriately modified depending on the specific usage of the present invention. For example, the locations where the stress relief portions are provided are not limited to the locations described above, but may be provided in at least a portion of the vertical members 61, 71, horizontal members 62, 72 and connecting members 63, 64, 73, 74 that make up the capture body 3 (at the connection portions of each member, or in the middle of each member). Furthermore, the number and positions of the stress relief portions can be arbitrarily determined and can be changed according to the shape and size of the capturing body 3 . [Explanation of symbols]

[0044] 1 Non-overflow area 2 Opening 21 Basics 3. Capture body 4 Mounting stand 41 Vertical section 42 Horizontal 6 Upstream unit 61 Vertical members 62 Cross member 63 First Connector 64 Second Tie 7 Downstream unit 71 Vertical members 72 Cross member 73 First Connector 74 Secondary Connector 8 Connecting material 81 First connecting material 82 Second connecting material 67,77,94,95,96,97,98 Stress relief 100 Dam

Claims

1. A capture body that allows flowing water flowing from the upstream of a river to pass through and captures objects contained in the flowing water, an upstream unit provided on the upstream side of the river, in which vertical members and horizontal members are connected via connecting members; a downstream unit provided on the downstream side of the river, in which vertical members and horizontal members are connected via connecting members; a connecting member that connects the upstream unit and the downstream unit, The lower ends of the upstream unit and the downstream unit in the vertical direction are fixed to a foundation constructed on the riverbed, The lateral ends of the upstream unit and the downstream unit are fixed to non-overflow portions constructed on both sides of the capture body in a direction across the river, A capture body characterized in that at least a portion of the vertical members, horizontal members, and connecting members are configured as stress relief portions.

2. 2. The capture body according to claim 1, wherein the stress relief portion is provided between adjacent vertical members or between adjacent horizontal members and the connecting member.

3. 3. The capture body according to claim 1, wherein the stress relief portion is a gap formed between adjacent members.

4. The vertical members, the horizontal members, and the connecting members are connected to each other by bolts and nuts at flanges provided on the connected portions, 3. The capture body according to claim 1, wherein the stress relief portion has fewer bolts and nuts than the other connected portions.

5. 5. The capture body according to claim 4, wherein the stress relief portion has all of the bolts and nuts connecting the flanges removed.

6. 3. The capture body according to claim 1, wherein the stress relief portion is configured such that adjacent members are not connected in a butted state.

7. The vertical members, the horizontal members, and the connecting members are connected to each other by bolts and nuts at flanges provided on the connected portions, 3. The capture body according to claim 1, wherein the stress relief portion is formed by connecting flanges provided on the connecting portions with a pin.

8. 3. The trapping body according to claim 1, wherein the downstream unit is bent so as to protrude toward the upstream side of the river.

9. 3. The trapping body according to claim 1, wherein the upstream unit and the downstream unit are both bent so as to protrude toward the upstream side of the river.

10. A pair of non-overflow sections protruding from both banks of the river, The capture body according to claim 1 or 2, which is provided at an opening between the pair of non-overflow portions; A dam characterized by comprising:

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