Capturing body and dam

Abstract

To enhance durability with respect to a temperature stress of a capturing body.SOLUTION: A capturing body (3) which allows flowing water which flows down from the upstream of a river to pass, and which captures objects contained in the flowing water includes: vertical materials (61, 71) extending in the height direction; and horizontal materials (62, 72) connected to the vertical materials, and extending in the direction crossing the vertical materials. At least parts of the vertical materials and horizontal materials are pin-joined.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, the capture body is vulnerable to temperature stress caused by changes in the ambient temperature due to the increased number of nodes in the components and the increased number of fixed points (rigid joints) to the foundation and non-overflow areas, so it was necessary to improve the durability of the capture body against temperature stress.

[0005] Therefore, the present invention has been made in consideration of the above problems, and aims to provide a technology that can increase the durability of a capture body against temperature stress. [Means for solving the problem]

[0006] One aspect of the present invention is a capture device that allows flowing water from upstream of a river to pass through and captures objects contained in the flowing water, and is characterized in that it comprises a vertical member extending in the height direction and a horizontal member connected to the vertical member and extending in a direction intersecting the vertical member, and at least a portion of the connection between the vertical member and the horizontal member is made by a pin joint.

[0007] 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 is characterized in that it comprises an upstream unit that is provided on the upstream side of the river and has vertical members and horizontal members connected to each other, a downstream unit that is provided on the downstream side of the river and has vertical members and horizontal members connected to each other, and connecting members that connect the upstream unit and the downstream unit, and at least some of the connections between the vertical members and the horizontal members are pin-jointed.

[0008] In the above aspect, it is preferable that the lower end of the vertical member is fixed to a foundation constructed on the riverbed.

[0009] In the above aspect, it is preferable that the ends of the cross members are fixed to non-overflow portions constructed on both sides of the capture body in the direction crossing the river.

[0010] In the above aspect, it is preferable that the horizontal member is connected to the vertical member on the upstream side of the river.

[0011] In the above aspect, it is preferable that the horizontal members are connected by connecting units attached to the vertical members.

[0012] In the above aspect, it is preferable that the connection position between the vertical member and the horizontal member is at a different height from the connection position between the upstream unit and the downstream unit by the connecting member.

[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, the durability of the trapping body against temperature stress can be improved. [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. 3 is a view taken along the line III-III in FIG. [Figure 4] FIG. [Figure 5] FIG. 2 is a view taken along arrows VV in FIG. [Figure 6] FIG. 10 is a diagram showing the connecting structure of vertical members and horizontal members. [Figure 7] FIG. 10 is a diagram showing the connecting structure of vertical members and horizontal members. [Figure 8] FIG. 10 is a diagram showing the connecting structure of vertical members and horizontal members. [Figure 9] FIG. 10 is a diagram showing the connecting structure of vertical members and horizontal members. 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 formed by connecting a plurality of vertical members 61 and a plurality of horizontal members 62 with a connecting unit 9 .

[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 members 61 are, for example, cylindrical steel pipes (pipe materials) with a straight axis along the longitudinal direction, and flanges (joints) provided at both ends of the steel pipes. Note that the vertical members 61 may be connected by welding their ends together without providing flanges, but considering replacement work after a debris flow collision, connection using flanges is preferable. In the capture body 3, multiple vertical members 61 are arranged side by side in the longitudinal direction. For example, the capture body 3 includes multiple types of vertical members 61 with different lengths.

[0025] For example, in the capture body 3, the vertical member 611 arranged at the bottom has its lower end buried in the foundation 21. In the capture body 3, the vertical member 612 arranged in the second tier from the bottom is connected to the vertical member 611 via a flange portion. The vertical member 612 is formed to be shorter than the vertical member 611. In the capture body 3, the vertical members 613 arranged in the third to twelfth rows from the bottom are formed longer than the vertical member 612 arranged in the second row from the bottom. Each vertical member 613 is formed to the same length, and is connected to a horizontal member 62. In the capture body 3, the vertical member 614 arranged in the uppermost stage is formed shorter than the vertical member 613, and the horizontal member 62 arranged in the uppermost stage is connected to the upper end of the vertical member 614 in the longitudinal direction.

[0026] 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 horizontal members 62 are arranged so that their longitudinal direction intersects with the longitudinal direction of the vertical members 61. 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. Furthermore, 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 each have, for example, a cylindrical steel pipe (pipe material) and flanges (joints) provided at both ends of the steel pipe. Note that the horizontal members 62 may be connected by welding their ends together without providing flanges, but considering replacement work after a debris flow collision, connection using flanges is preferable.

[0027] 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. An auxiliary member 65 is connected to the horizontal member 62 arranged at the lowest level. The auxiliary member 65 is arranged so that its longitudinal direction is parallel to the longitudinal direction of the vertical members 61, with one end connected to the horizontal member 62 and the other end buried in the foundation 21. The auxiliary member 65 firmly fixes the upstream unit 6 to the foundation 21 and also narrows the gap between adjacent vertical members 61, thereby increasing the effect of capturing debris flow.

[0028] The horizontal member 62 is connected to the vertical member 61 via a connecting unit 9 on the upstream side of the river of the vertical member 61. Here, the connecting unit 9 does not rigidly connect the vertical member 61 and the horizontal member 62, but rather connects them by pins. In other words, although the vertical member 61 and the horizontal member 62 are connected to each other, only parts of their surfaces are in contact with each other, and they are not rigidly connected by bolts and nuts or welding. Specifically, as shown in FIGS. 1 and 6, the connection unit 9 includes a placing portion 91, a holding portion 92, and a fixing portion 93. One end of the mounting portion 91 is fixed to the outer periphery of the vertical member 61 by welding or the like, and extends linearly along a horizontal direction perpendicular to the longitudinal direction of the vertical member 61. The mounting portion 91 is formed, for example, from a channel steel, and is fixed to the vertical member 61 so that the largest flat portion of the channel steel faces upward and extends horizontally. The upward-facing flat portion of the mounting portion 91 functions as a mounting area for the horizontal member 62. The retaining portion 92 is engaged with the horizontal member 62 so that it is in contact with about half of the outer periphery of the horizontal member 62, and both ends thereof are fixed to the vertical member 61. The retaining portion 92 is formed, for example, from a wire rope or a round steel bar bent into a U-shape. For example, two retaining portions 92 are provided, and are engaged with the horizontal member 62 at a distance approximately equal to the outer diameter of the vertical member 61. Thread grooves are formed at both ends of the retaining portion 92 into which nuts can be screwed. Instead of forming thread grooves at both ends of the retaining portion 92, bolts that screw into nuts may be provided. The fixing portion 93 fixes the holding portion 92 to the vertical member 61, thereby positioning the horizontal member 62 held by the holding portion 92 to the vertical member 61. The fixing portion 93 has, for example, a channel steel 931 and a nut 932. An end of the holding portion 92 is inserted into the channel steel 931 on the back side of the contact area of ​​the horizontal member 62 on the vertical member 61, and the end of the holding portion 92 is fastened with the nut 932. In other words, the channel steel 931 functions as a washer. The channel steel 931 is formed, for example, along the longitudinal direction of the horizontal member 62 so that the ends of a pair of holding portions 92 that sandwich the vertical member 61 at the same height can be inserted therethrough, and is provided so as to contact the surface of the vertical member 61. As shown in FIG. 6 , two channel steels 931 are arranged side by side in the height direction of the vertical member 61, along the longitudinal direction of the horizontal member 62. The channel steel 931 may be formed as a single rectangular member so that all ends of the holding portion 92 can be inserted therethrough. Here, the vertical member 61 , the placing portion 91 , and the holding portion 92 are in contact with the outer peripheral surface of the horizontal member 62 .

[0029] In this way, by using pin joints to connect the vertical members 61 and the horizontal members 62, it is possible to release the temperature stress acting on the trapping body 3 due to temperature changes around the dam 100, thereby improving the durability of the trapping body 3 against temperature stress. In other words, the pin joints function as stress relief sections that release temperature stress. Originally, the vertical members 61 and the horizontal members 62 were rigidly connected to connecting members (steel pipes connected in a roughly cross shape) installed at their intersections using bolts and nuts via flanges. By changing this rigid connection to a pin joint, it is possible to increase the durability of the trapping body 3 against temperature stress.

[0030] 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 is formed by connecting a plurality of vertical members 71 and a plurality of horizontal members 72 with a connecting unit 9 .

[0031] 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, for example, cylindrical steel pipes (pipe materials) with a straight axis along the longitudinal direction, and flanges (joints) provided at both ends of the steel pipes. Note that the vertical members 71 may be connected by welding their ends together without providing flanges, but considering replacement work after a debris flow collision, connection using flanges is preferable. In the capture body 3, multiple vertical members 71 are arranged side by side in the longitudinal direction. For example, the capture body 3 includes multiple types of vertical members 71 with different lengths.

[0032] For example, in the capture body 3, the lowermost vertical member 711 has its lower end buried in the foundation 21. In the capture body 3, the vertical member 712 arranged in the second tier from the bottom is connected to the vertical member 711 via a flange portion. The vertical member 712 is formed to be shorter than the vertical member 711. In the capture body 3, the vertical members 713 arranged in the third to twelfth rows from the bottom are formed longer than the vertical member 712 arranged in the second row from the bottom. Each vertical member 713 is formed to the same length, and the horizontal members 72 are connected to each other. In the capture body 3, the vertical member 714 arranged in the uppermost stage is formed shorter than the vertical member 713, and the horizontal member 72 arranged in the uppermost stage is connected to the upper end of the vertical member 714 in the longitudinal direction.

[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 horizontal members 72 are arranged so that their longitudinal direction intersects with the longitudinal direction of the vertical members 71. The horizontal members 72 are connected to the vertical members 71 so that they are arranged at the same height as the horizontal members 62. 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. Furthermore, 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 each have, for example, a cylindrical steel pipe (pipe material) and flanges (joints) provided at both ends of the steel pipe. Note that the ends of each horizontal member 72 may be connected by welding without providing flanges, but considering replacement work after a debris flow collision, connection using flanges is preferable.

[0034] 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 2, the ends of the cross members 72 are connected to the frame 4, and the frame 4 is buried in the non-overflow section 1, thereby fixing each cross member 72 to the non-overflow section 1.

[0035] The horizontal member 72 is connected to the vertical member 71 on the upstream side of the river from the vertical member 71 via a connecting unit 9. Here, the connecting unit 9 does not rigidly connect the vertical member 71 and the horizontal member 72, but rather connects them by pins. In other words, although the vertical member 71 and the horizontal member 72 are connected to each other, only parts of their surfaces are in contact with each other, and they are not rigidly connected by bolts and nuts or welding. Specifically, as shown in FIGS. 2 and 6, the connection unit 9 includes a placing portion 91, a holding portion 92, and a fixing portion 93. One end of the mounting portion 91 is fixed to the outer periphery of the vertical member 71 by welding or the like, and extends linearly along a horizontal direction perpendicular to the longitudinal direction of the vertical member 71. The mounting portion 91 is formed, for example, from a channel steel, and is fixed to the vertical member 71 so that the largest flat portion of the channel steel faces upward and extends horizontally. The upward-facing flat portion of the mounting portion 91 functions as a mounting area for the horizontal member 72. The retaining portion 92 is engaged with the horizontal member 72 so that about half of the outer periphery of the horizontal member 72 is in contact with the retaining portion 92, and both ends of the retaining portion 92 are fixed to the vertical member 71. The retaining portion 92 is formed, for example, from a wire rope or a round steel bar bent into a U-shape. For example, two retaining portions 92 are provided, and are engaged with the horizontal member 72 at a distance approximately equal to the outer diameter of the vertical member 71. Thread grooves are formed at both ends of the retaining portion 92 into which nuts can be screwed. Instead of forming thread grooves at both ends of the retaining portion 92, bolts that screw into nuts may be provided. The fixing portion 93 fixes the holding portion 92 to the vertical member 71, thereby positioning the horizontal member 72 held by the holding portion 92 to the vertical member 71. The fixing portion 93 has, for example, a channel steel 931 and a nut 932. An end of the holding portion 92 is inserted into the channel steel 931 on the back side of the contact area of ​​the horizontal member 72 on the vertical member 71, and the end of the holding portion 92 is fastened with the nut 932. In other words, the channel steel 931 functions as a washer. The channel steel 931 is formed, for example, along the longitudinal direction of the horizontal member 72 so that the ends of a pair of holding portions 92 that sandwich the vertical member 71 at the same height can be inserted therethrough, and is provided so as to contact the surface of the vertical member 71. As shown in FIG. 6 , two channel steels 931 are arranged side by side along the longitudinal direction of the horizontal member 72 and in the height direction of the vertical member 71. The channel steel 931 may be formed as a single rectangular member so that all ends of the holding portion 92 can be inserted therethrough. Here, the vertical member 71 , the placing portion 91 , and the holding portion 92 are in contact with the outer peripheral surface of the horizontal member 72 .

[0036] In this way, by using pin joints to connect the vertical members 71 and the horizontal members 72, it is possible to relieve the temperature stress acting on the trapping body 3 due to temperature changes around the dam 100, thereby improving the durability of the trapping body 3 against temperature stress. In other words, the pin joints function as stress relief sections that relieve temperature stress. Originally, the vertical members 71 and the horizontal members 72 were rigidly connected to connecting members (steel pipes connected in a roughly cross shape) at their intersections using bolts and nuts via flanges. By changing this rigid connection to a pin joint, it is possible to increase the durability of the trapping body 3 against temperature stress.

[0037] 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 (612-614) of the upstream unit 6 and the vertical members 71 (712-714) 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. As shown in FIG. 3 , the connection position between the first connecting member 81 and the upstream unit 6 is at a different height from the connection position between the vertical member 61 and the horizontal member 62 by the connection unit 9. 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. As shown in FIG. 3 , the connection position between the second connecting member 82 and the downstream unit 7 is at a different height from the connection position between the vertical member 71 and the horizontal member 72 by the connection unit 9. 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. To the connecting members 8 located at the top of the capturing body 3, auxiliary members 83 extending in a direction intersecting the longitudinal direction of the connecting members 8 are connected. The auxiliary materials 83 prevent rocks and driftwood contained in the debris flow from falling toward the foundation 21 from between the upstream unit 6 and downstream unit 7 of the capture body 3. As shown in Fig. 5, the connecting materials 8 other than the topmost one are not provided with the auxiliary materials 83, but the connecting materials 8 of all the tiers may be provided with the auxiliary materials 83.

[0038] 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.

[0039] According to the above-described trapping body 3 and dam 100, the trapping body 3 in the dam 100 is embedded and fixed in the non-overflow section 1 and foundation 21. However, at least some of the connections between the vertical members 61, 71 and the horizontal members 62, 72 that make up the trapping body 3 are pin-jointed, which reduces the number of fastening points (rigid joints) using bolts and nuts or welding, improving the durability of the trapping body 3 against temperature stress. Furthermore, because the upstream unit 6 and downstream unit 7 have a lattice-like structure in which the vertical members 61, 71 and the horizontal members 62, 72 are connected, the number of nodes between the members can be minimized, improving the durability of the trapping body 3 against temperature stress. This ensures the safety of the dam 100 structure when inspecting for temperature stress. As a result, the size and thickness of the steel pipe that constitutes the capture body 3 can be reduced, and the costs of manufacturing and installing the capture body 3 can be reduced. Furthermore, since the horizontal members 62, 72 and the connecting member 8 are not directly connected but are separated, if the horizontal members 62, 72 are damaged due to a collision with a mudslide or the like, the horizontal members 62, 72 can be easily replaced, thereby reducing the maintenance and management of the capture body 3 and the dam 100 in terms of construction and costs. Moreover, by releasing the temperature stress from the pin joint portion of the connecting unit 9, deformation of the capturing body 3 can be suppressed. Furthermore, the connection between the vertical members 61, 71 and the horizontal members 62, 72 by pin joints can be easily performed by the connection unit 9.

[0040] <Modification> Next, a modified example of pin joints between the vertical members 61, 71 and the horizontal members 62, 72 using a connecting unit will be described. As shown in FIG. 7, the connection unit 9A includes, for example, a bottom portion 91a, a side portion 92a, and a lid portion 93a. One end of the bottom 91a is joined and fixed to the outer periphery of the vertical members 61, 71 by welding or the like, and extends linearly along a horizontal direction perpendicular to the longitudinal direction of the vertical members 61, 71. The bottom 91a is formed, for example, from a structural steel, and is fixed to the vertical members 61, 71 so that the flat portion of the structural steel faces upward and extends along the horizontal direction. The upward-facing flat portion of the bottom 91a functions as a mounting area for the horizontal members 62, 72, and supports the horizontal members 62, 72 from below. One end of the side portion 92a is detachably connected to the tip of the bottom portion 91a with a bolt and a nut, and extends linearly upward along the height direction that is the longitudinal direction of the vertical members 61, 71. The side portion 92a is formed, for example, from a structural steel, and is fixed to the tip of the bottom portion 91a so that the flat portion of the structural steel faces the vertical members 61, 71 and extends along the height direction. The flat portions of the side portion 92a facing the vertical members 61, 71 function as holding areas for the horizontal members 62, 72, and sandwich the horizontal members 62, 72 between the vertical members 61, 71 to support the horizontal members 62, 72 from the sides. One end of the lid portion 93a is detachably connected to the upper end of the side portion 92a with a bolt and a nut, and the other end is fixed to the outer periphery of the vertical members 61, 71 by welding or the like. The lid portion 93a extends linearly in a horizontal direction perpendicular to the longitudinal direction of the vertical members 61, 71. That is, the lid portion 93a extends parallel to the bottom portion 91a. The lid portion 93a is formed, for example, from a structural steel, and is fixed to the upper ends of the vertical members 61, 71 and the side portions 92a so that the flat portions of the structural steel face the bottom portion 91a and extend horizontally. The flat portions of the lid portion 93a facing the bottom portion 91a function as a holding area for the horizontal members 62, 72, sandwiching the horizontal members 62, 72 between the lid portion 93a and the bottom portion 91a to support the horizontal members 62, 72 from above. Here, the vertical members 61, 71, the bottom portion 91a, the side portion 92a, and the lid portion 93a abut against the outer peripheral surfaces of the horizontal members 62, 72, respectively. By adopting such a configuration, the horizontal members 62, 72 can be pressed from all four directions and pin-joined without being rigidly joined to the vertical members 61, 71.

[0041] As shown in FIG. 8, a plurality of connecting units 9B may be fixed to the outer peripheral surfaces of the vertical members 61, 71 by welding or the like, and the horizontal members 62, 72 may be connected by these connecting units 9B. Specifically, the connection unit 9B includes, for example, steel plates 91b, 92b, and bolts 93b and nuts 94b that connect the steel plates 91b and 92b. The steel plates 91b, 92b are formed with recesses (receiving portions) 95b, 96b that abut against at least half of the outer circumferential surfaces of the horizontal members 62, 72. The steel plates 91b are fixed to the outer circumferential surfaces of the vertical members 61, 71 by welding or the like, with a predetermined interval between them so as to be aligned along the longitudinal direction of the horizontal members 62, 72. When connecting the horizontal members 62, 72 with the connection unit 9B, the horizontal members 62, 72 are received in the recesses 95b of each steel plate 91b fixed to the vertical members 61, 71, so that the steel plates 91b and the horizontal members 62, 72 abut against each other, and the horizontal members 62, 72 are received in the recesses 96b of each steel plate 92b, so that the steel plates 92b and the horizontal members 62, 72 abut against each other. That is, the horizontal members 62, 72 are sandwiched between the steel plates 91b and 92b. Then, the steel plates 91b and 92b are connected with bolts 93b and nuts 94b. As a result, the horizontal members 62, 72 are pin-joined to the vertical members 61, 71 via the connecting units 9B. The number of steel plates 91b fixed to the vertical members 61, 71 can be changed as appropriate depending on the size of the vertical members 61, 71 and the ease of connecting the steel plates 92b.

[0042] As shown in FIG. 9, a connecting unit 9C may be fixed to the outer peripheral surfaces of the vertical members 61, 71 by welding or the like, and the horizontal members 62, 72 may be connected by this connecting unit 9C. Specifically, the connection unit 9C has, for example, two gripping portions 91c and a support portion 92c. The gripping portion 91c is formed from a plate material that is long in one direction and has a connecting portion 93c and a curved portion 94c. The gripping portions 91c are arranged at intervals along the extension direction of the cross members 62, 72 so as to sandwich the support portion 92c. The connecting portions 93c are formed on both ends of the grip portion 91c, and are connected to the support portion 92c with the connecting portions 93c overlapping each other, and are connected to the support portion 92c by bolts 99a and nuts 99b. The connecting portions 93c are formed with a plurality of bolt holes through which the bolts 99a pass. The connecting portion 93c is formed in a flat plate shape, and when connected to the support portion 92c, the connecting portions 93c overlap each other and are arranged to extend in a horizontal direction perpendicular to the direction in which the vertical members 61, 71 extend. The curved portion 94c is formed continuously between the two connecting portions 93c and curved to surround the outer circumferential surfaces of the cross members 62, 72. The length of the curved portion 94c along the inner extension direction is formed to be approximately equal to the outer periphery of the cross members 62, 72. This allows the curved portion 94c to cover the outer surfaces of the cross members 62, 72 along the circumferential direction, and when the curved portion 94c grips the cross members 62, 72, the connecting portions 93c overlap and abut against each other. Note that when gripping the cross members 62, 72 with the gripping portion 91c, it is preferable to use the elasticity of the gripping portion 91c to elastically deform the gripping portion 91c so as to widen the space between the connecting portions 93c. The support portion 92c is formed from a plate material and has an attachment portion 95c, a mounting portion 96c, and a rib 97c. The mounting portion 95c is a portion that is fixed to the vertical members 61, 71 by welding or the like, and one longitudinal side edge of the mounting portion 95c is formed with a recess 98c that abuts against the outer peripheral surface of the vertical member 61, 71. The mounting portion 95c is fixed to the vertical members 61, 71 by joining the abutting portions of the vertical members 61, 71 and the recess 98c by welding or the like. In the mounting portion 95c, a plurality of bolt holes are formed near both ends that sandwich the recess 98c, which are used to connect the mounting portion 95c to the connecting portion 93c of the grip portion 91c using bolts 99a and nuts 99b. One end edge of the placing portion 96c is connected to the other longitudinal side edge of the mounting portion 95c by welding or the like. The placing portion 96c is a portion on which the horizontal members 62, 72 are placed. The placing portion 96c is formed to be curved with approximately the same curvature as the horizontal members 62, 72. When the horizontal members 62, 72 are placed on the placing portion 96c, the placing portion 96c is formed to extend so as to curve upward across the lowest ends of the horizontal members 62, 72. The placing portion 96c is disposed between the two gripping portions 91c. The rib 97c is a reinforcing member for stably fixing the support portion 92c to the vertical members 61, 71. The rib 97c is fixed by welding or the like to the back side of the mounting portion 96c (the lower side on which the horizontal members 62, 72 are not placed). A portion of the rib 97c is fixed to the vertical members 61, 71 by welding or the like. As a result, by connecting the support parts 92c fixed to the vertical members 61, 71 and the gripping parts 91c that grip the horizontal members 62, 72, the horizontal members 62, 72 are pin-joined to the vertical members 61, 71 via the connecting units 9C.

[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. The capture body that uses pin joints to connect the members is not limited to the capture body formed in an arch shape as described above, but may also be a capture body made of straight steel pipes connected in a lattice pattern, a capture body that is λ-shaped when viewed from the side in which the upstream unit and the downstream unit are connected at their upper ends, a capture body whose lower end only is fixed to the foundation, or a capture body whose side end only is fixed to the non-overflow section. Furthermore, the number and positions of the pin-jointed connecting portions are arbitrary and can be changed according to the shape and size of the capture 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 7 Downstream unit 71 Vertical members 72 Cross member 8 Connecting material 81 First connecting material 82 Second connecting material 9 Connecting Units 91 Placement section 92 Holding part 93 Fixed part 931 Channel steel 932 Nut 9A Connecting Unit 91a bottom 92a Side 93a Lid 9B connecting unit 91b steel plate 92b steel plate 93b Bolt 94b Nut 95b Recess 96b Recess 9C connecting unit 91c Grip 92c Support part 93c connection part 94c curved section 95c mounting part 96c Placement section 97c Rib 98c recess 99a Bolt 99b Nut 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, A vertical member extending in the height direction; a horizontal member connected to the vertical member and extending in a direction intersecting the vertical member; A capture body characterized in that at least a portion of the connection between the vertical members and the horizontal members is made by pin joints.

2. 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 and having vertical members and horizontal members connected together; a downstream unit provided on the downstream side of the river and having vertical members and horizontal members connected together; a connecting member that connects the upstream unit and the downstream unit, A capture body characterized in that at least a portion of the connection between the vertical members and the horizontal members is made by pin joints.

3. 3. The trapping body according to claim 1, wherein the lower end of the vertical member is fixed to a foundation constructed on the riverbed.

4. 3. A trap as described in claim 1 or 2, characterized in that the ends of the cross members are fixed to non-overflow sections constructed on both sides of the trap in the direction crossing the river.

5. 3. The trapping body according to claim 1, wherein the horizontal member is connected to the vertical member on the upstream side of the river.

6. 3. The capture body according to claim 1, wherein the horizontal members are connected by connecting units attached to the vertical members.

7. 3. The capture body according to claim 2, wherein the connection position between the vertical member and the horizontal member is at a different height from the connection position between the upstream unit and the downstream unit by the connecting member.

8. 3. The trapping body according to claim 2, 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 2, 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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