Dam

Abstract

To provide a dam allowed to be constructed at a low cost.SOLUTION: A dam is provided with a dam body 10, a pair of sleeve concrete parts 31, 31, and a bottom concrete part 30. An upstream side part 10U at an upstream side F1 of the dam body 10 is provided with a plurality of vertical steel pipes 11 and a plurality of horizontal steel pipes 20. The horizontal steel pipes 20 are placed at an uppermost side and a lowermost side, including first horizontal steel pipes 21 bridged over the pair of sleeve concrete parts, second horizontal steel pipes 22 extending from the sleeve concrete parts 31 to be connected to the vertical steel pipes 11A adjacent to the sleeve concrete parts 31, and third horizontal steel pipes 23 positioned at a position different from those of the first horizontal steel pipes 21 and the second horizontal steel pipes 22. Each of the third horizontal steel pipes 23 is smaller in a sectional area and easier to be deformed than each pipe constituting steel pipe groups PG including the vertical steel pipes 11, the first horizontal steel pipes 21, and the second horizontal steel pipes 22.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] BACKGROUND ART Dams that are placed in rivers to hold back large rocks, driftwood, and the like contained in debris flows that occur during heavy rain and other events are known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 01-111727 Summary of the Invention [Problem to be solved by the invention]

[0004] One of the objects of the present invention is to provide a dam that can be constructed at low cost. [Means for solving the problem]

[0005] (1): The present invention is a dam that is installed in a horizontal direction that intersects with the flow direction of a river, and comprises a dam body, a pair of sleeve concrete sections that are arranged on both sides of the river in the horizontal direction and to which both sides of the dam body in the horizontal direction are fixed, and a bottom concrete section that is poured into the ground and to which the underside of the dam body is fixed, and the upstream part of the dam body that is on the upstream side in the flow direction comprises a plurality of vertical steel pipes that are erected upward from the bottom concrete section and a plurality of horizontal steel pipes that extend in the horizontal direction between the pair of sleeve concrete sections, and the multiple The horizontal steel pipes are located at the top and bottom, respectively, and include a first horizontal steel pipe that spans the pair of sleeve concrete sections, a second horizontal steel pipe that extends from the sleeve concrete section and connects to the vertical steel pipe adjacent to the sleeve concrete section in the horizontal direction, and one or more third horizontal steel pipes that are located in positions different from the first horizontal steel pipe and the second horizontal steel pipe, and each of the third horizontal steel pipes has a smaller cross-sectional area and is more easily deformed than each of the steel pipes that make up the group of steel pipes that includes the multiple vertical steel pipes, the first horizontal steel pipe, and the second horizontal steel pipe.

[0006] (2): In (1), the plurality of horizontal steel pipes may include a fourth horizontal steel pipe located at a position different from the first horizontal steel pipe, the second horizontal steel pipe, and the third horizontal steel pipe, and the group of steel pipes may further include the fourth horizontal steel pipe.

[0007] (3) In (1) or (2), the diameter of each of the third horizontal steel pipes may be smaller than the diameter of each of the steel pipes that make up the group of steel pipes.

[0008] (4) In (1) or (2), the thickness of each of the third horizontal steel pipes may be smaller than the thickness of each of the steel pipes that make up the group of steel pipes.

[0009] (5): In any of (1) to (4), the number of the one or more third horizontal steel pipes may be plural, and the multiple third horizontal steel pipes may include one or more pairs of the third horizontal steel pipes adjacent to each other with a gap in the horizontal direction.

[0010] (6): In any one of (1) to (5), the dam body may be curved so as to protrude toward the upstream side in the flow direction. [Effects of the Invention]

[0011] According to the present invention, a dam that can be constructed at low cost is provided. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram schematically illustrating a portion of a dam according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a view of the dam shown in FIG. 1 as seen from the upstream side in the flow direction. [Figure 3] FIG. 2 is a view of the dam shown in FIG. 1 as seen from the downstream side in the flow direction. [Figure 4] 3 is a diagram for explaining the cross-sectional area of ​​the steel pipes that constitute the structural body group shown in FIG. 2 and the cross-sectional area of ​​the third horizontal steel pipe. FIG. [Figure 5] FIG. 10 is a view of the upstream portion of a dam according to a second embodiment of the present invention, viewed from the upstream side in the flow direction. [Figure 6] FIG. 10 is a view of the upstream portion of a dam according to a third embodiment of the present invention, as viewed from the upstream side in the flow direction. [Figure 7] 5 is a view for explaining the cross-sectional area of ​​the steel pipes constituting the structural group and the cross-sectional area of ​​the third horizontal steel pipe from a different perspective from that of FIG. 4. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] Below, embodiments for carrying out the dam according to the present invention are illustrated with reference to the accompanying drawings. The embodiments illustrated below are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention can be modified or improved from the following embodiments without departing from the spirit of the present invention. Furthermore, in the accompanying drawings, the dimensions of each component may be exaggerated or reduced, and hatching may be omitted, in order to facilitate understanding.

[0014] (First embodiment) FIG. 1 is a schematic diagram showing a portion of a dam 1 according to this embodiment. As shown in FIG. 1, the dam 1 is a permeable sabo dam. The dam 1 is installed along a horizontal direction Y that intersects with the flow direction F of the river Ri (i.e., across the river Ri), and stands upright along a vertical direction X that is roughly parallel to the vertical direction. Hereinafter, in the horizontal direction Y, the right side as viewed from the upstream side F1 in the flow direction F will be referred to as the "right," and the left side as viewed from the upstream side in the flow direction F will be referred to as the "left." Furthermore, in the vertical direction X, the side facing the river Ri (the ground side) will be referred to as the "bottom," and the side opposite the river Ri side (the zenith side) will be referred to as the "top."

[0015] Figure 2 is a view of the dam 1 as seen from the upstream side in the flow direction F. Figure 3 is a view of the dam 1 as seen from the upstream side in the flow direction F. Note that, for convenience, the river Ri is not shown in Figures 2 and 3. As shown in Figures 1 to 3, the dam 1 comprises a dam main body 10, a pair of sleeve concrete sections 31 (right sleeve concrete section 31R and left sleeve concrete section 31L), and a bottom concrete section 30. The dam main body 10 crosses the river Ri. In other words, the dam main body 10 extends in the lateral direction Y. When viewed from the longitudinal direction X, the dam main body 10 is curved so as to protrude toward the upstream side F1. In this embodiment, the dam 1 is a so-called arch dam. The dam body 10 is composed of a plurality of steel pipes extending in the vertical direction X (hereinafter referred to as "vertical steel pipes"), a plurality of steel pipes extending in the horizontal direction Y (hereinafter referred to as "horizontal steel pipes"), and a plurality of steel pipes extending in the flow direction F (hereinafter referred to as "connected steel pipes") arranged in a mesh pattern.

[0016] The sleeve concrete 31R is located on the right side of the river Ri. The right end portion of the dam main body 10 (i.e., the right end portion of each horizontal steel pipe) is buried and fixed in the sleeve concrete 31R. The sleeve concrete 31L is located on the left side of the river Ri. The left end portion of the dam main body 10 (i.e., the left end portion of each of the multiple horizontal steel pipes) is buried and fixed in the sleeve concrete 31L. The multiple horizontal steel pipes extend in the horizontal direction Y between the pair of sleeve concrete 31R, 31L. The bottom concrete 30 is poured into the ground. The lower end portion of the dam main body 10 (i.e., the lower end portion of each of the multiple vertical steel pipes) is buried and fixed in the bottom concrete 30.

[0017] The dam body 10 includes an upstream portion 10U (see FIG. 2) located on the upstream side F1 (facing the upstream side F1) and a downstream portion 10D (see FIG. 3) located on the downstream side F2 (facing the downstream side F2). The upstream portion 10U and the downstream portion 10D extend generally parallel to each other and curve so as to protrude toward the upstream side F1. The upstream portion 10U and the downstream portion 10D are connected by the above-mentioned multiple connecting steel pipes 40 (see FIG. 1).

[0018] For convenience, the downstream portion 10D is not shown in Fig. 1, and only a portion of the multiple connected steel pipes 40 is shown. Furthermore, in Fig. 2, the downstream portion 10D that can be seen from the upstream side F1 is not shown in Fig. 2 to prevent the drawing from becoming unclear. Furthermore, in Fig. 3, the upstream portion 10U that can be seen from the downstream side F2 is not shown in Fig. 2 to prevent the drawing from becoming unclear.

[0019] The upstream portion 10U will now be described.

[0020] As shown in Figure 2, the upstream section 10U of the dam main body 10 is configured in a lattice pattern when viewed from the flow direction F. The upstream section 10U includes a plurality of vertical steel pipes 11 erected upward from the bottom concrete 30 and a plurality of horizontal steel pipes 20 extending in the horizontal direction Y between a pair of sleeve concrete sections 31R, 31L (hereinafter referred to as the "horizontal steel pipe group 20"). The horizontal steel pipe group 20 includes two first horizontal steel pipes 21, 21, a plurality of second horizontal steel pipes 22, and one or more (multiple in this embodiment) third horizontal steel pipes 23. Note that the number of second horizontal steel pipes 22 and the number of third horizontal steel pipes 23 are not limited to those shown in the figures.

[0021] In this embodiment, each of the multiple vertical steel pipes 11 is formed from multiple steel pipes. Specifically, a flange Fr is provided at one end in the longitudinal direction of the steel pipes that make up each of the multiple vertical steel pipes 11. Each of the multiple vertical steel pipes 11 may be formed by overlapping the flanges Fr of the steel pipes in the vertical direction X and joining the overlapped flanges Fr together by, for example, welding or bolting. However, the vertical steel pipe 11 may also be formed from a single steel pipe.

[0022] One of the two first horizontal steel pipes 21, 21 is located at the uppermost position among the multiple horizontal steel pipes that make up the horizontal steel pipe group 20, and the other is located at the lowermost position among the multiple horizontal steel pipes that make up the horizontal steel pipe group 20. For each of the two first horizontal steel pipes 21, 21, the right end is embedded and fixed in the sleeve concrete 31R, and the left end is embedded and fixed in the sleeve concrete 31L. In this way, each of the first horizontal steel pipes 21, 21 is bridged across a pair of sleeve concrete 31R, 31L.

[0023] The number of first horizontal steel pipes 21 is not limited to two. For example, at least one of the upper and lower first horizontal steel pipes 21 may be formed by joining multiple horizontal steel pipes. In this case, the number of first horizontal steel pipes 21 will be three or more.

[0024] Each of the second horizontal steel pipes 22 is located between two first horizontal steel pipes 21, 21 in the vertical direction X. The second horizontal steel pipes 22 include one or more second horizontal steel pipes 22 on the right side and one or more second horizontal steel pipes 22 on the left side. The right-side second horizontal steel pipes 22 have their right-side ends embedded and fixed in the sleeve concrete 31R, and their left-side ends connected (e.g., welded) to the vertical steel pipe 11 adjacent to the sleeve concrete 31R in the horizontal direction Y. On the other hand, the left-side second horizontal steel pipes 22 have their left-side ends embedded and fixed in the sleeve concrete 31L, and their right-side ends connected (e.g., welded) to the vertical steel pipe 11 adjacent to the sleeve concrete 31L in the horizontal direction Y. In this way, each of the second horizontal steel pipes 22 extends from the sleeve concrete 31 and is connected to the vertical steel pipe 11A adjacent to the sleeve concrete 31 in the horizontal direction Y.

[0025] One or more third horizontal steel pipes 23 are located at positions different from the first horizontal steel pipe 21 and the second horizontal steel pipe 22. Specifically, each third horizontal steel pipe 23 is located between the vertical steel pipe 11 adjacent to the sleeve concrete 31R and the vertical steel pipe 11 adjacent to the sleeve concrete 31L in the horizontal direction Y, and between the upper first horizontal steel pipe 21 and the lower first horizontal steel pipe 21 in the vertical direction X. In this embodiment, the multiple third horizontal steel pipes 23 include a third horizontal steel pipe 23 (right third horizontal steel pipe 23) extending to the left from the vertical steel pipe 11 adjacent to the sleeve concrete 31R and a third horizontal steel pipe 23 (left third horizontal steel pipe 23) extending to the right from the vertical steel pipe 11 adjacent to the sleeve concrete 31L. The right third horizontal steel pipe 23 is joined to multiple vertical steel pipes 11, including the vertical steel pipe 11 adjacent to the sleeve concrete 31R. A flange Fr is provided at the left end of the right-side third horizontal steel pipe 23. The left-side third horizontal steel pipe 23 is joined to multiple vertical steel pipes 11, including the vertical steel pipe 11 adjacent to the sleeve concrete 31L. A flange Fr is provided at the right end of the left-side third horizontal steel pipe 23. The right-side third horizontal steel pipe 23 and the left-side third horizontal steel pipe 23 may be constructed by butting their respective flanges Fr together in the horizontal direction Y and joining the butted flanges Fr together by, for example, welding or bolting. However, one third horizontal steel pipe 23 may also be formed from a single steel pipe.

[0026] Here, the multiple vertical steel pipes 11, first horizontal steel pipes 21, 21, and multiple second horizontal steel pipes 22 are collectively referred to as a structural steel pipe group PG (steel pipe group). In this embodiment, the cross-sectional area perpendicular to the longitudinal direction of each steel pipe constituting the structural steel pipe group PG is the same. That is, as shown in FIG. 4(A), each steel pipe constituting the structural steel pipe group PG has a plate thickness PT1, a diameter D1, and a cross-sectional area Ar1 perpendicular to the longitudinal direction. For each of the steel pipes constituting the structural steel pipe group PG, the plate thickness PT1 may be, for example, 22 mm or more, and the diameter D1 may be, for example, 600 mm.

[0027] In this embodiment, each steel pipe that makes up the structural steel pipe group PG acts as a structural member of the dam main body 10. The shape of the dam main body 10 is maintained by each steel pipe that makes up the structural steel pipe group PG. Specifically, the vertical steel pipe 11 prevents the dam main body 10 from collapsing when exposed to a debris flow or the like, and defines the length of the dam main body 10 in the vertical direction X.

[0028] Here, the structural members maintain the shape of the dam body 10 and support the functional members (described later) that capture debris flows, driftwood, etc. The dent rate of such structural members may be about 10%. Note that the structural members may also serve as functional members.

[0029] The area in the dam body 10 that captures rocks, driftwood, etc. is called the capture area CA. Of the vertical steel pipes 11, the vertical steel pipe 11A adjacent to the sleeve concrete 31 defines both ends of the capture area CA in the horizontal direction Y. The two first horizontal steel pipes 21, 21 define the upper and lower ends of the capture area CA, and also dissipate the impact of rocks, driftwood, etc. that collide with the steel pipes in the capture area CA to the sleeve concrete 31. The second horizontal steel pipe 22 dissipates the impact of rocks, driftwood, etc. that collide with the steel pipes in the capture area CA to the sleeve concrete 31.

[0030] Each of the third horizontal steel pipes 23 has the same cross-sectional area perpendicular to the longitudinal direction. That is, as shown in FIG. 4B, each of the third horizontal steel pipes 23 has a thickness PT2, a diameter D2, and a cross-sectional area Ar2 perpendicular to the longitudinal direction. In this embodiment, the thickness PT2 is equal to the thickness PT1, and the diameter D2 is smaller than the diameter D1. Therefore, the cross-sectional area Ar2 perpendicular to the longitudinal direction of each of the third horizontal steel pipes 23 is smaller than the cross-sectional area Ar1 of each steel pipe constituting the structural steel pipe group PG. As shown in FIG. 2, each of the third horizontal steel pipes 23 is located within the capture area CA and functions as a functional member for capturing driftwood, rocks, and the like that have flowed in from the upstream side F1.

[0031] Here, collisions with the functional components by debris, driftwood, rocks, etc. from the debris flow are unavoidable. Therefore, the functional components are configured so that they do not break upon impact but remain in place, and have a small cross-sectional area that allows them to easily undergo plastic deformation. Functional components configured in this way can absorb the impact of the debris flow and capture the debris, driftwood, rocks, etc. from the debris flow. The dent rate of such functional components may be around 40%. In other words, the functional components are steel pipes that are more easily deformed than the structural members.

[0032] In this embodiment, each of the plurality of third horizontal steel pipes 23 and each of the steel pipes constituting the structural steel pipe group PG are formed of the same material. The material from which the steel pipes are formed is not particularly limited, but may be, for example, a carbon steel pipe, more specifically, STK490.

[0033] Generally, when made of the same material, steel pipes with a smaller cross-sectional area (for example, a smaller diameter or thinner plate thickness) are more likely to deform than steel pipes with a larger cross-sectional area. Therefore, in this embodiment, each of the multiple third horizontal steel pipes 23 is a steel pipe that has a smaller cross-sectional area and is more likely to deform than the respective steel pipes that make up the structural steel pipe group PG.

[0034] As shown in FIG. 3, the downstream section 10D of the dam main body 10 is configured in a lattice shape when viewed from the flow direction F. The downstream section 10D includes a plurality of vertical steel pipes 50 erected upward from the bottom concrete 30 and a plurality of horizontal steel pipes 51 extending in the horizontal direction Y between a pair of sleeve concrete sections 31R, 31L. In this embodiment, each of the vertical steel pipes 50 has a configuration (same dimensions, shape, and material) similar to that of each of the vertical steel pipes 11 in the upstream section 10U. Also, in this embodiment, each of the horizontal steel pipes 51 has a configuration (same dimensions, shape, and material) similar to that of each of the first horizontal steel pipes 21, 21 in the upstream section 10U. That is, in this embodiment, the vertical steel pipes 50 and the horizontal steel pipes 51 have a thickness PT1, a diameter D1, and an area Ar1 shown in FIG. 4A, and function as structural members of the dam main body 10.

[0035] In this embodiment, each of the connecting steel pipes 40 also has a thickness PT1, a diameter D1, and an area Ar1 as shown in Figure 4(A). Therefore, in this embodiment, each of the connecting steel pipes 40 functions as a structural member of the dam body 10.

[0036] As explained above, the dam 1 according to this embodiment comprises a dam main body 10, a pair of sleeve concrete sections 31R, 31L arranged on either side of the river Ri in the horizontal direction Y and fixed to both sides of the dam main body 10 in the horizontal direction Y, and a bottom concrete section 30 poured into the ground and fixed to the underside of the dam main body 10. The upstream section 10U of the dam main body 10 on the upstream side F1 in the flow direction F comprises a plurality of vertical steel pipes 11 erected upward from the bottom concrete section 30, and a plurality of horizontal steel pipes (a group of horizontal steel pipes 20) extending in the horizontal direction Y between the pair of sleeve concrete sections 31R, 31L. The horizontal steel pipe group 20 includes a first horizontal steel pipe 21 located at the top and bottom, respectively, spanning a pair of sleeve concrete sections 31R, 31L, a second horizontal steel pipe 22 extending from the sleeve concrete section 31 and connecting to the vertical steel pipe 11A adjacent to the sleeve concrete section 31 in the horizontal direction Y, and one or more third horizontal steel pipes 23 located in a position different from the first horizontal steel pipe 21 and the second horizontal steel pipe 22. In such a dam 1, each of the third horizontal steel pipes 23 is a steel pipe that has a smaller cross-sectional area and is more easily deformed than the respective steel pipes that make up the structural steel pipe group PG.

[0037] According to the dam 1, each of the steel pipes constituting the structural steel pipe group PG, including the multiple vertical steel pipes 11, the first horizontal steel pipe 21, and the second horizontal steel pipe 22, functions as a structural member. Therefore, even if the dam main body 10 is exposed to a debris flow, damage to the structure of the dam main body 10 is effectively suppressed. On the other hand, according to the dam 1, the cross-sectional area Ar2 of each of the third horizontal steel pipes 23, which functions as a functional member, is smaller than the cross-sectional area Ar1 of the steel pipes in the structural steel pipe group PG. Therefore, the amount of material per standard length required to manufacture the third horizontal steel pipe 23 is smaller than the amount of material per standard length required to manufacture the steel pipes constituting the structural steel pipe group PG. Therefore, the cost of the functional member (third horizontal steel pipe 23) in the dam main body can be reduced. Therefore, according to this embodiment, it is possible to construct a dam at low cost without damaging the dam structure.

[0038] (Second embodiment) Next, a dam according to the second embodiment will be described. Note that, for the dam according to this embodiment, only the differences from the dam 1 according to the first embodiment will be described, and the other components will be assigned the same reference numerals as in the first embodiment, except in specific cases, and description thereof will be omitted.

[0039] Figure 5 is a view of the dam 2 according to this embodiment as seen from the upstream side in the flow direction. Therefore, Figure 5 mainly shows the upstream portion 200U of the dam main body 200 of the dam 2. Note that, in Figure 5, the downstream portion that can be seen from the upstream side F1 is omitted to prevent the drawing from becoming unclear. The downstream portion of the dam main body 200 of the dam 2 is formed in a lattice pattern by a plurality of vertical steel pipes 50 and a plurality of horizontal steel pipes 51, as in the first embodiment. Furthermore, the dam main body 200 includes a plurality of connecting steel pipes 40 that connect the upstream portion 200U and the downstream portion, as in the first embodiment.

[0040] 5, in the dam 2, the configuration of the horizontal steel pipe group 220 in the upstream portion 200U of the dam main body 200 is different from the configuration of the horizontal steel pipe group 20 in the first embodiment. This point will be explained below.

[0041] The horizontal steel pipe group 220 includes a plurality of third horizontal steel pipes 223, two first horizontal steel pipes 21, 21 similar to those in the first embodiment, and a plurality of second horizontal steel pipes 22 similar to those in the first embodiment. Each of the plurality of third horizontal steel pipes 223 is located within the capture area CA. A gap G is formed between a pair of adjacent third horizontal steel pipes 223 in the horizontal direction Y. That is, in this embodiment, a pair of adjacent third horizontal steel pipes 223 in the horizontal direction Y are not joined. The plurality of third horizontal steel pipes 223 includes a third horizontal steel pipe 223 extending to the left from a vertical steel pipe 11 adjacent to the sleeve concrete 31R, a third horizontal steel pipe 223 extending to the right from a vertical steel pipe 11 adjacent to the sleeve concrete 31L, and third horizontal steel pipes 223 extending to both the left and right from the other vertical steel pipes 11. In this embodiment, the length of the third horizontal steel pipe 223 extending to the left from the vertical steel pipe 11 in the horizontal direction Y and the length of the third horizontal steel pipe 223 extending to the right from the vertical steel pipe 11 are each shorter than the distance between adjacent vertical steel pipes 11, 11 in the horizontal direction Y.

[0042] Note that some of the multiple third horizontal steel pipes 223 may be joined together. That is, in this embodiment, the multiple third horizontal steel pipes 223 may include one or more pairs of third horizontal steel pipes 223 adjacent to each other with a gap G in the horizontal direction Y. Furthermore, while Fig. 5 shows an example in which a pair of third horizontal steel pipes 223 opposing each other in the horizontal direction Y are positioned at the same position in the vertical direction X, it is also acceptable for the positions of a pair of third horizontal steel pipes 223 opposing each other in the horizontal direction Y to be shifted from each other in the vertical direction X. In addition, Figure 5 shows an example in which the length of the third horizontal steel pipe 223 extending to the left from the vertical steel pipe 11 and the length of the third horizontal steel pipe 223 extending to the right from the vertical steel pipe are each shorter than the distance between adjacent vertical steel pipes 11, 11 in the horizontal direction Y, but the length of some of the multiple third horizontal steel pipes 223 extending to the left from the vertical steel pipe 11 and the length of some of the multiple third horizontal steel pipes 223 extending to the right from the vertical steel pipe 11 may each be longer than the distance between adjacent vertical steel pipes 11, 11 in the horizontal direction Y.

[0043] According to this embodiment, the multiple third horizontal steel pipes 223 include one or more pairs of third horizontal steel pipes 223 adjacent to each other with a gap G in the horizontal direction Y. With this configuration, unlike the first embodiment, there is no need to connect adjacent third horizontal steel pipes in the horizontal direction Y. Therefore, according to this embodiment, the process of connecting (for example, fastening or welding) the third horizontal steel pipes to each other can be omitted, making construction relatively easy, and there is no need to design the third horizontal steel pipes so that they can be connected to each other, which can improve design freedom.

[0044] (Third embodiment) Next, a dam according to a third embodiment will be described. Regarding the dam according to this embodiment, only the differences from the dam 1 according to the first embodiment will be described, and the other components will be denoted by the same reference numerals as in the first embodiment, except in specific cases, and description thereof will be omitted.

[0045] FIG. 6 is a view of the dam 3 according to this embodiment as seen from the upstream side in the flow direction. Therefore, FIG. 6 mainly shows the upstream portion 300U of the dam main body 300 of the dam 3. Note that, in FIG. 6, the downstream portion that can be seen from the upstream side F1 is omitted to prevent the drawing from becoming unclear. The downstream portion of the dam main body 300 of the dam 3 is formed in a lattice pattern by a plurality of vertical steel pipes 50 and a plurality of horizontal steel pipes 51, as in the first embodiment. Furthermore, the dam main body 300 includes a plurality of connecting steel pipes 40 that connect the upstream portion 300U and the downstream portion, as in the first embodiment.

[0046] As shown in Figure 6, dam 3 differs from dam 1 according to the first embodiment in that the configuration of horizontal steel pipe group 320 in the upstream portion 300U of dam main body 300 is different from the configuration of horizontal steel pipe group 20 in the first embodiment. Below, the differences between dam 1 and dam 3 will be explained.

[0047] In this embodiment, the vertical steel pipe 11 is configured by connecting four steel pipes with flanges Fr, and has a length in the vertical direction X that is approximately twice as long as that of the first and second embodiments. In other words, the dam 3 has a height that is approximately twice as long as that of the first and second embodiments.

[0048] The horizontal steel pipe group 320 includes two first horizontal steel pipes 21, 21 similar to those in the first embodiment, a plurality of second horizontal steel pipes 22 similar to those in the first embodiment, a plurality of third horizontal steel pipes 223 similar to those in the second embodiment, and one or more (two in this embodiment) fourth horizontal steel pipes 324. In the horizontal steel pipe group 320, the two fourth horizontal steel pipes 324, 324 are located at positions different from the first horizontal steel pipe 21, the second horizontal steel pipe 22, and the third horizontal steel pipe 223, and are located between the upper first horizontal steel pipe 21 and the lower first horizontal steel pipe 21 in the vertical direction X.

[0049] The right end of each of the two fourth horizontal steel pipes 324, 324 is embedded and fixed in the sleeve concrete 31R, and the left end is embedded and fixed in the sleeve concrete 31L. In this way, each fourth horizontal steel pipe 324 is bridged over a pair of sleeve concrete 31R, 31L. The cross-sectional area Ar1 of each fourth horizontal steel pipe 324 is the same as the area Ar1 of the first horizontal steel pipe 21 and the second horizontal steel pipe 22 (see FIG. 4(A)). In this embodiment, the two fourth horizontal steel pipes 324, 324 are adjacent to each other in the vertical direction X.

[0050] In the vertical direction X, a plurality of second horizontal steel pipes 22 and a plurality of third horizontal steel pipes 223 are arranged between the upper first horizontal steel pipe 21 and the upper fourth horizontal steel pipe 324. That is, a capture area CA is defined by the upper first horizontal steel pipe 21, the upper fourth horizontal steel pipe 324, the vertical steel pipe 11 adjacent to the sleeve concrete 31R, and the vertical steel pipe 11 adjacent to the sleeve concrete 31L. The upper fourth horizontal steel pipe 324 not only defines the capture area CA, but also acts as a structural member that dissipates impacts from rocks, driftwood, etc. that collide with the steel pipes in the capture area CA into the sleeve concrete 31.

[0051] In the vertical direction X, a plurality of second horizontal steel pipes 22 and a plurality of third horizontal steel pipes 223 are arranged between the lower first horizontal steel pipe 21 and the lower fourth horizontal steel pipe 324. That is, a capture area CA is defined by the lower first horizontal steel pipe 21, the lower fourth horizontal steel pipe 324, the vertical steel pipe 11 adjacent to the sleeve concrete 31R, and the vertical steel pipe 11 adjacent to the sleeve concrete 31L. The lower fourth horizontal steel pipe 324 not only defines the capture area CA, but also acts as a structural member that dissipates impacts from rocks, driftwood, etc. that collide with the steel pipes in the capture area CA into the sleeve concrete 31.

[0052] That is, in this embodiment, the structural steel pipe group PG (steel pipe group) includes a vertical steel pipe 11, a first horizontal steel pipe 21, a second horizontal steel pipe 22, and a fourth horizontal steel pipe 324, and the fourth horizontal steel pipe 324 is located in a different position from the first horizontal steel pipe 21, the second horizontal steel pipe 22, and the third horizontal steel pipe 323. In this embodiment, the fourth horizontal steel pipe 324 constitutes a dam main body 300 in which capture areas CA are arranged vertically. Therefore, according to this embodiment, the capture area CA can be expanded in the vertical direction X.

[0053] Note that Figure 6 shows an example in which the third horizontal steel pipe 223 of the second embodiment is used as the third horizontal steel pipe, which is a functional component, but in the dam 3, the third horizontal steel pipe 23 of the first embodiment may also be used as the third horizontal steel pipe, which is a functional component.

[0054] Although the present invention has been described above using the above embodiment as an example, the present invention is not limited to this.

[0055] For example, in any of the above-described embodiments, a second steel pipe other than the vertical steel pipe 11 may be provided as a steel pipe extending in the vertical direction. The second steel pipe acts as a functional member and has a cross-sectional area Ar2 (see FIG. 4(B)) smaller than the cross-sectional area Ar1 of the vertical steel pipe 11. Note that the second steel pipe is provided in a portion in the horizontal direction Y other than the portion where the vertical steel pipe 11 is provided. In other words, it should be noted that the second steel pipe is not applied as the vertical steel pipe 11A adjacent to the sleeve concrete 31 in the horizontal direction Y. Furthermore, it is preferable that the number of second steel pipes is smaller than the number of vertical steel pipes 11. For example, the number of second steel pipes may be 80% or less of the number of vertical steel pipes 11, 60% or less, 50% or less, 30% or less, 10% or less, or may be a number smaller than the number of vertical steel pipes 11.

[0056] In addition, in the above-mentioned embodiment, as shown in Figure 4, an example was described in which the plate thickness PT2 of the third horizontal steel pipe 23, 323 is made equal to the plate thickness PT1 of the steel pipes that constitute the structural steel pipe group PG, and the diameter (diameter) D2 of the third horizontal steel pipe 23, 323 is made smaller than the diameter (diameter) D1 of the steel pipes that constitute the structural steel pipe group PG, thereby making the cross-sectional area Ar2 of the third horizontal steel pipe 23, 323 smaller than the cross-sectional area Ar1 of the steel pipes that constitute the structural steel pipe group PG. However, for example, as shown in (A) and (B) of Figures 7, the cross-sectional area Ar2 of the third horizontal steel pipe 23, 323 can be made smaller than the cross-sectional area Ar1 of the steel pipes that make up the structural steel pipe group PG by making the plate thickness PT2 of the third horizontal steel pipe 23, 323 smaller than the plate thickness PT1 of the steel pipes that make up the structural steel pipe group PG and making the diameter (diameter) D2 of the third horizontal steel pipe 23, 323 equal to the diameter (diameter) D1 of the steel pipes that make up the structural steel pipe group PG.

[0057] Also, for example, the width of the dam body in the horizontal direction Y may be increased by increasing the number of vertical steel pipes 11 while maintaining the spacing between adjacent vertical steel pipes 11, 11 in the horizontal direction Y, thereby increasing the width of the capture area CA.

[0058] In addition, in the above-mentioned embodiments, examples have been described in which the dam main body 10, 200, 300 is a so-called arch dam that is curved so as to protrude toward the upstream side F1, but the dam main body does not have to be curved as described above when viewed in the vertical direction, and may be straight along the horizontal direction Y.

[0059] In addition, those skilled in the art can appropriately modify the dam of the present invention in accordance with conventionally known knowledge. As long as such modifications still have the configuration of the present invention, they are of course included in the scope of the present invention. [Explanation of symbols]

[0060] 1-3...Dam, 10, 200, 300...Dam body, 10U, 200U, 300U...Upstream section, 11...Vertical steel pipe, 20...Horizontal steel pipe, 21...First horizontal steel pipe, 22...Second horizontal steel pipe, 23, 223, 323...Third horizontal steel pipe, 30...Bottom concrete, 31...Sleeve concrete, 324...Fourth horizontal steel pipe, Ar1, Ar2...Area, G...Gap, PT1, PT2...Plate thickness, Ri...River, Y...Horizontal direction

Claims

1. A dam installed along a horizontal direction intersecting the flow direction of a river, The dam itself, a pair of sleeve concrete sections that are arranged on both sides of the river in the lateral direction and to which both sides of the dam body in the lateral direction are fixed; and a bottom concrete portion that is poured into the ground and to which the underside of the dam body is fixed, The upstream portion of the dam body, which is located on the upstream side in the flow direction, includes a plurality of vertical steel pipes erected upward from the bottom concrete and a plurality of horizontal steel pipes extending in the horizontal direction between the pair of sleeve concrete sections, The plurality of horizontal steel pipes are a first horizontal steel pipe located at each of the uppermost and lowermost positions and spanning the pair of sleeve concrete sections; A second horizontal steel pipe extending from the sleeve concrete and connected to the vertical steel pipe adjacent to the sleeve concrete in the horizontal direction; one or more third horizontal steel pipes located at positions different from the first horizontal steel pipe and the second horizontal steel pipe; Including, A dam, wherein each of the third horizontal steel pipes is a steel pipe that has a smaller cross-sectional area and is more easily deformed than each of the steel pipes that make up the group of steel pipes including the plurality of vertical steel pipes, the first horizontal steel pipe, and the second horizontal steel pipe.

2. the plurality of horizontal steel pipes include a fourth horizontal steel pipe located at a position different from the first horizontal steel pipe, the second horizontal steel pipe, and the third horizontal steel pipe; The dam according to claim 1 , wherein the group of steel pipes further includes the fourth horizontal steel pipe.

3. 3. The dam according to claim 1 or 2, wherein the diameter of each of the third horizontal steel pipes is smaller than the diameter of each of the steel pipes that make up the group of steel pipes.

4. 3. The dam according to claim 1 or 2, wherein the thickness of each of the third horizontal steel pipes is smaller than the thickness of each of the steel pipes constituting the group of steel pipes.

5. The number of the one or more third horizontal steel pipes is plural, The dam according to claim 1 or 2, wherein the plurality of third horizontal steel pipes include one or more pairs of the third horizontal steel pipes adjacent to each other with a gap in the horizontal direction.

6. The dam according to claim 1 or 2, wherein the dam body is curved so as to protrude upstream in the flow direction.

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