Damming device

Abstract

To provide a dam device capable of reducing cost while coping with a small object.SOLUTION: A dam device 1A is provided on bottom concrete 30 placed on the bottom of a river between a pair of wing concretes 20 provided so as to sandwich the river. The dike device 1A includes a plurality of columns 2 extending upward from the bottom concrete 30 and arranged along the direction (Y direction) crossing the river, a plurality of horizontal members 3 supported between the adjacent columns 2, extending along the Y direction, and arranged along the vertical direction (Z direction), and vertical members 4 extending upward from the bottom concrete 30 between the adjacent columns 2 and independent of the horizontal members 3. The cross-sectional areas of the cross member 3 and the vertical member 4 are smaller than the cross-sectional area of the post 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Slit dams have been proposed in the past for capturing boulders, driftwood, and the like in mountain valleys, rivers, and the like (see, for example, Patent Document 1). In the slit dam described in Patent Document 1, horizontal ties connect the upstream supports to each other, and top ties connect the upstream and downstream supports near their upper ends to each other. Such slit dams are configured to capture boulders, driftwood, and the like by combining vertical and horizontal members. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-40081 Summary of the Invention [Problem to be solved by the invention]

[0004] In a slit dam (embankment) that captures an object using a lattice made up of vertical and horizontal members as described in Patent Document 1, the opening dimensions of the lattice are set according to the size of the object. In this case, if the object is relatively small, the opening dimensions of the lattice become small, which increases the number of vertical and horizontal members and joints, which increases the number of work steps and tends to increase costs.

[0005] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a dam device that can be used for small objects while reducing costs. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the dam device of the present invention is a dam device that is installed on bottom concrete poured on the bottom of a river between a pair of sleeve concrete sections that are arranged on either side of the river, and is characterized in that it comprises a plurality of pillars that extend upward from the bottom concrete and are lined up in a direction across the river, a plurality of horizontal members that are supported between adjacent pillars and extend in the cross direction and are lined up in a vertical direction, and vertical members that extend upward from the bottom concrete between adjacent pillars and are independent of the horizontal members, and the cross-sectional areas of the horizontal members and the vertical members are smaller than the cross-sectional areas of the pillars.

[0007] In the dam device according to one aspect of the present invention, the vertical members are arranged on the upstream side or downstream side of the river with respect to the horizontal members and the support columns.

[0008] In the dam device according to one aspect of the present invention, the upper end of the vertical member is located below the lowest horizontal member among the plurality of horizontal members.

[0009] In one embodiment of the dam device of the present invention, the support pillar has a plurality of support portions that protrude toward the vertical member and on which each of the horizontal members is placed, and the horizontal members are arranged so as to be sandwiched between the support pillar and the vertical member. [Effects of the Invention]

[0010] The dam device according to the present invention can accommodate small objects while reducing costs. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a front view showing a dam device according to a first embodiment of the present invention. [Figure 2] 1 is a cross-sectional view showing a dam device according to a first embodiment of the present invention. [Figure 3] FIG. 4 is a front view showing a dam device according to a second embodiment of the present invention. [Figure 4]FIG. 4 is a cross-sectional view showing a dam device according to a second embodiment of the present invention. [Figure 5] FIG. 10 is a front view showing a dam device according to a third embodiment of the present invention. [Figure 6] FIG. 10 is a cross-sectional view showing a dam device according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] [First embodiment] A first embodiment of the present invention will now be described with reference to the drawings, in which: Fig. 1 is a front view showing a dam device 1A according to a first embodiment of the present invention, and Fig. 2 is a cross-sectional view showing the dam device 1A.

[0013] As shown in FIG. 1, a dam device 1A according to a first embodiment of the present invention is installed on a bottom concrete portion 30 poured on the bottom of a river, between a pair of sleeve concrete portions 20 arranged on either side of the river. The dam device 1A includes a plurality of support columns 2 extending upward from the bottom concrete portion 30 and aligned in a direction across the river (Y direction), a plurality of horizontal members 3 supported between adjacent support columns 2 and extending in the Y direction and aligned in a vertical direction (Z direction), and a vertical member 4 extending upward from the bottom concrete portion 30 between adjacent support columns 2 and independent of the horizontal member 3. The cross-sectional areas of the horizontal members 3 and the vertical member 4 are smaller than the cross-sectional area of ​​the support columns 2. The dam device 1A will be described in detail below.

[0014] In the following, the direction across the river along a horizontal plane is referred to as the Y direction, the vertical direction is referred to as the Z direction, and the direction perpendicular to both the Y and Z directions (the direction of river flow when viewed from the Z direction) is referred to as the X direction. In Figure 1, the river flows from the front to the back of the page, and in Figure 2, the direction of river flow is indicated by arrow R. Although the X direction and the river flow direction may not coincide, the upstream side of the river is also referred to as the upstream side in the X direction, and the downstream side of the river is also referred to as the downstream side in the X direction. Furthermore, the upstream and downstream sides in the X direction may sometimes be simply referred to as the upstream and downstream sides, and the up and down in the Z direction may sometimes be simply referred to as the up and down sides.

[0015] The dam device 1A, together with a pair of concrete sleeves 20 and a concrete bottom 30, constitutes a dam 10, which is a so-called permeable dam. The pair of concrete sleeves 20 are cast on both sides of the river in the Y direction, and the concrete bottom 30 is cast at the bottom of the river.

[0016] The support pillars 2 are hollow tubular members such as steel pipes extending in a predetermined direction, but may also be solid rod-shaped members. The lower ends 21 of the support pillars 2 are embedded in the bottom concrete 30 and extend upward in the Z direction. Multiple support pillars 2 (three in this embodiment) are lined up in the Y direction at predetermined intervals.

[0017] Each support column 2 has a plurality of support portions 22 for supporting the cross member 3 on the side facing the adjacent support column 2, and the plurality of support portions 22 are lined up in the Z direction on each support column 2. An example of the support portions 22 is one that has a welded portion welded to the support column 2, extends toward the adjacent support column 2, and has a flange provided at its tip. In this case, a flange is also provided at the end of the cross member 3, and the flange of the support portion 22 and the flange of the cross member 3 are connected. The cylindrical support column 2 is not open to the outside at the welded portion where the support portions 22 are connected, that is, its internal space does not communicate with the external space (i.e., water does not enter).

[0018] Furthermore, the support portion 22 may be formed in a cylindrical shape that is open on the side facing the adjacent support 2 and closed on the opposite side. In this case, the closed side of the support portion 22 is welded to the main body of the support 2, so that the internal space of the support 2 does not communicate with the external space (i.e., water does not enter). The end of the cross member 3 is inserted into such a cylindrical support portion 22. Through holes for inserting bolts are formed in the support portion 22 and the end of the cross member 3, and the cross member 3 is fixed to the support portion 22 by inserting and fastening bolts 23 into these through holes.

[0019] The horizontal member 3 is a cylindrical or rod-shaped member, such as a steel pipe, extending in a predetermined direction. It may be hollow or solid. The cross-sectional area of ​​the horizontal member 3 is smaller than that of the support columns 2, and the horizontal member 3 and the support columns 2 are made of the same material. Therefore, the horizontal member 3 is more easily deformed than the support columns 2. The horizontal member 3 is supported between two support columns 2 arranged in the Y direction. In FIG. 1 , the horizontal member 3 is supported between the left support column 2 and the center support column 2, and at the same height (position in the Z direction), the horizontal member 3 is supported between the right support column 2 and the center support column 2. Furthermore, between two adjacent support columns 2, multiple support portions 22 are aligned along the Z direction, so that multiple horizontal members 3 are also aligned along the Z direction. The cross-sectional area of ​​the horizontal member 3 is preferably 20 to 70% of the cross-sectional area of ​​the support columns 2. If both are cylindrical, the thickness of the horizontal member 3 is preferably 40 to 70% of the thickness of the support columns 2.

[0020] The distance between adjacent horizontal members 3 in the Z direction may be set to a length corresponding to the size of the object to be captured (e.g., equivalent to the diameter of the gravel) so that gravel, driftwood, etc., which are the object to be captured, can be captured. Here, gravel, driftwood, etc. that are carried away by the rapids during flooding in rivers are called "solids in the river." Of the solids in the river, those that are equal to or larger than a certain size are the object to be captured.

[0021] The vertical members 4 are cylindrical or rod-shaped members such as steel pipes extending in a predetermined direction, and may be hollow or solid. The cross-sectional area of ​​the vertical members 4 is smaller than that of the support columns 2, and the vertical members 4 and support columns 2 are made of the same material. Therefore, the vertical members 4 are easier to deform than the support columns 2. The cross-sectional area of ​​the vertical members 4 is preferably 20 to 70% of the cross-sectional area of ​​the support columns 2, and if both are cylindrical, the wall thickness of the vertical members 4 is preferably 40 to 70% of the wall thickness of the support columns 2.

[0022] The vertical members 4 are embedded in the bottom concrete 30 at one end 41 upstream of the horizontal members 3 and the support columns 2, and extend upward along the Z direction. The vertical members 4 are arranged between adjacent support columns 2 in the Y direction; that is, the support columns 2 and the vertical members 4 are arranged in a staggered (zigzag) pattern. In this embodiment, the support columns 2 and the vertical members 4 are alternately arranged along the Y direction, but multiple vertical members 4 may be provided between the support columns 2. The upper end 42 of the vertical member 4 is located below the lowest horizontal member 3 among the multiple horizontal members 3, so that the vertical members 4 do not overlap with any of the horizontal members 3 when viewed from the X direction as shown in FIG. 1 . Furthermore, the vertical members 4 are not connected to the horizontal members 3 and are independent.

[0023] The distance between adjacent vertical members 4 and support posts 2 in the Y direction (the distance between the vertical members 4 when multiple vertical members 4 are provided between support posts 2) may be set to a length corresponding to the size of the object to be captured (e.g., equivalent to the diameter of the pebble) so that the object, such as pebble or driftwood, can be captured. In this case, two adjacent support posts 2 and the vertical members 4 placed between them are arranged to form the vertices of a triangle in a plan view (viewed in the Z direction). In addition, the distance in the Z direction between the upper end 42 of a vertical member 4 and the lowest horizontal member 3 when viewed from the X direction may also be set to a length corresponding to the size of the object to be captured (e.g., equivalent to the diameter of the pebble).

[0024] When solids are present in a river in which such a dam 10 has been installed, relatively small solids will pass between the horizontal members 3 or between the vertical members 4 and the support pillars 2, i.e., will flow away without being captured by the dam 10, whereas solids large enough to be captured will not be able to pass between the horizontal members 3 or between the vertical members 4 and the support pillars 2, and will be captured by the dam 10.

[0025] When a solid object in the river attempts to pass through the dam 10, it may collide with the support columns 2, horizontal members 3, or vertical members 4. In this case, the horizontal members 3 and vertical members 4, which are relatively easily deformed relative to the support columns 2, deform before the support columns 2. The energy of the collision is absorbed by the horizontal members 3 and vertical members 4, minimizing the impact on the support columns 2. Furthermore, even if a solid object in the river collides with the support columns 2 above the vertical members 4, the collision energy is transmitted to the more easily deformed horizontal members 3, which deform and absorb the energy before the support columns 2, minimizing the impact on the support columns 2. When the horizontal members 3 and vertical members 4 deform and the amount of deformation exceeds a predetermined level, the horizontal members 3 and vertical members 4 can be replaced. In this case, it is preferable that the horizontal members 3 are detachably supported by the support columns 2, and the vertical members 4 are detachably fixed to the bottom concrete 30. If the support columns 2, which are less affected by the collision energy, remain intact, the permeable dam can be maintained by replacing the horizontal members 3 and vertical members 4.

[0026] As described above, according to the dam device 1A of the first embodiment of the present invention, the vertical members 4 are independent of the horizontal members 3, which reduces the number of connection points between the vertical and horizontal members. Therefore, even if the number of support columns 2, horizontal members 3, and vertical members 4 is increased to accommodate small objects, it is possible to suppress cost increases. Furthermore, because the cross-sectional area of ​​the horizontal members 3 and vertical members 4 is smaller than the cross-sectional area of ​​the support columns 2, it is possible to suppress the costs of the horizontal members 3 and vertical members 4 themselves. As described above, the dam device 1A can accommodate small objects while reducing costs.

[0027] Furthermore, since the cross-sectional area of ​​the horizontal members 3 and vertical members 4 is smaller than the cross-sectional area of ​​the support pillar 2, the weight of the steel material can be reduced, and work efficiency can be improved.

[0028] Furthermore, since the vertical members 4 are arranged upstream of the horizontal members 3 and the support pillars 2, i.e., they are arranged offset in the X direction, they are less likely to interfere with the vertical members 4 when installing the support pillars 2 (or are less likely to interfere with the support pillars 2 when installing the vertical members 4), improving workability. Furthermore, as described above, the vertical members 4 are more easily deformed than the support pillars 2 and are therefore more able to absorb collision energy, so that when a solid object in the river collides with the support pillar 2 on the downstream side, the energy has already been absorbed, reducing the impact on the support pillar 2.

[0029] Furthermore, by positioning the upper end portions 42 of the vertical members 4 below the lowest horizontal member 3, the vertical members 4 can be shortened, further reducing costs. Furthermore, by shortening the vertical members 4, workability can be improved.

[0030] [Second embodiment] A second embodiment of the present invention will be described below with reference to the drawings. Fig. 3 is a front view showing a dam device 1B according to the second embodiment of the present invention, and Fig. 4 is a cross-sectional view showing the dam device 1B. In the second embodiment and a third embodiment described later, components having the same functions and shapes as those in the first embodiment are given the same reference numerals and will not be described again. Differences from the first embodiment will be mainly described.

[0031] The dam device 1B of the second embodiment has a vertical member 5 instead of the vertical member 4 of the dam device 1A of the first embodiment. The vertical member 5 differs from the vertical member 4 in that it is located downstream of the horizontal members 3 and the support pillars 2, and like the vertical member 4, one end 51 of the vertical member 5 is embedded in the bottom concrete 30, and an upper end 52 of the vertical member 5 is located below the lowest horizontal member 3 of the multiple horizontal members 3.

[0032] When river solids such as gravel and driftwood are present in a river equipped with such a dam 10, the method for capturing the river solids is the same as in the first embodiment. However, in the first embodiment, the river solids tend to collide with the upstream vertical members 4 first, whereas in the second embodiment, the river solids tend to collide with other components before colliding with the vertical members 5. Since multiple struts 2 are aligned in the Y direction, the cross-sectional area through which water can pass is smaller than that in the X direction where no struts 2 are installed. Furthermore, the flow velocity tends to be slower near the struts 2 and faster in the center between the struts 2, so the river solids tend to move toward the vertical members 5 located in this center. This configuration makes it easy for the river solids to collide with the vertical members 5 and be captured, even if the vertical members 5 are located downstream. Furthermore, as in the first embodiment, the vertical members 5 can absorb collision energy by deforming.

[0033] The dam apparatus 1B according to the second embodiment of the present invention can accommodate small objects while reducing costs, similar to the dam apparatus 1A according to the first embodiment. Furthermore, the vertical members 5 are arranged downstream of the horizontal members 3 and the support columns 2, i.e., offset in the X direction, so that they are less likely to interfere with the vertical members 5 when installing the support columns 2 (or are less likely to interfere with the support columns 2 when installing the vertical members 5), improving workability. Furthermore, the upper ends 52 of the vertical members 5 are positioned below the lowest horizontal member 3, so that the vertical members 5 can be made shorter, further reducing costs.

[0034] [Third embodiment] A third embodiment of the present invention will now be described with reference to the drawings. Fig. 5 is a front view showing a dam device 1C according to a third embodiment of the present invention, and Fig. 6 is a cross-sectional view showing the dam device 1C.

[0035] The dam device 1C of the third embodiment includes a plurality of support columns 6, a plurality of horizontal members 3, and a plurality of vertical members 7.

[0036] As in the first embodiment, the vertical members 7 are arranged upstream of the horizontal members 3 and the support columns 2. Moreover, unlike the first embodiment, the vertical members 7 have the same Z-direction dimension as the support columns 2, and overlap all of the horizontal members 3 when viewed from the upstream side.

[0037] The support pillars 6 are provided with a plurality of support portions 8 that protrude toward the upstream side, which is the side of the vertical member 4. The horizontal member 3 is placed on the upper surfaces 81 of the plurality of support portions 8 that are lined up along the Y direction. In this case, the upper surfaces 81 may be, for example, planar along the XY plane, or may be an arc-shaped curved surface as viewed from the Y direction so as to follow the outer circumferential surface of the horizontal member 3. Furthermore, it is preferable that the support portions 8 provided on the support pillars 6 arranged at both ends in the Y direction have the function of fixing the horizontal member 3 (particularly the function of restricting movement in the Y direction). Furthermore, a restricting member that prevents the horizontal member 3 from slipping out upward may be detachably provided at the upper end of the support pillars 6.

[0038] Since the support portion 8 is provided on the vertical member 7 side of the support column 6, the horizontal member 3 placed on the support portion 8 is sandwiched between the support column 6 and the vertical member 7.

[0039] The dam device 1C according to the third embodiment of the present invention can accommodate small objects while reducing costs, similar to the dam device 1A according to the first embodiment. Furthermore, the vertical members 7 are arranged upstream of the horizontal members 3 and the support posts 6, i.e., offset in the X direction, so that the vertical members 7 are less likely to interfere with the support posts 6 when they are installed (or the vertical members 7 are less likely to interfere with the support posts 6 when they are installed), improving workability.

[0040] Furthermore, since the horizontal member 3 placed on the support portion 8 is sandwiched between the support column 6 and the vertical member 7, movement of the horizontal member 3 in the Z direction and the X direction can be easily restricted.

[0041] It should be noted that the present invention is not limited to the above-described embodiments, and includes other configurations that can achieve the object of the present invention, and the following modifications are also included in the present invention. For example, in the above-described first to third embodiments of the present invention, the vertical members are arranged upstream of the river relative to the horizontal members and the support columns, i.e., are arranged offset in the X direction, but as in the first and second embodiments, when the upper end of the vertical member is located below the lowest horizontal member among the multiple horizontal members, the vertical members do not need to be offset in the X direction relative to the horizontal members and the support columns (i.e., the vertical members may be located directly below the horizontal members).

[0042] Furthermore, in the first and second embodiments, a continuous cross member 3 is provided across two adjacent pillars 2, but the cross member may be interrupted between two adjacent pillars 2. In other words, the cross member 3 may be cantilevered by the support portion 22 of one pillar 2.

[0043] In addition, in the third embodiment, the vertical member 7 is arranged upstream of the support pillar 6, and the support portion 8 protrudes upstream of the support pillar 6, but the support portion only needs to protrude toward the vertical member, and when the vertical member is arranged downstream of the support pillar, the support portion only needs to protrude downstream. Also, instead of the configuration in which the vertical member 7 is supported by the support portion 8 of the support pillar 6, the vertical member may be provided with an attachment portion for attaching it to the support pillar.

[0044] Although the embodiments of the present invention have been described above, the present invention is not limited to the dam device according to the above embodiments, and includes all aspects encompassed by the concept of the present invention and the 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, and quantity of each component in the above embodiments may be appropriately modified depending on the specific use of the present invention. [Explanation of symbols]

[0045] 1A to 1C... dam device, 2, 6... support pillar, 3... horizontal member, 4, 5, 7... vertical member, 42, 52... upper end portion, 8... support portion

Claims

1. A dam device installed on a bottom concrete section poured on the bottom of a river between a pair of sleeve concrete sections installed on either side of the river, a plurality of columns extending upward from the bottom concrete and aligned in a direction across the river; a plurality of cross members supported between adjacent columns, extending along the transverse direction and aligned along the vertical direction; and vertical members extending upward from the bottom concrete between adjacent columns and independent of the horizontal members, A dam device characterized in that the cross-sectional areas of the horizontal members and the vertical members are smaller than the cross-sectional area of ​​the support pillars.

2. 2. The dam device according to claim 1, wherein the vertical members are arranged on the upstream side or downstream side of the river with respect to the horizontal members and the support columns.

3. 3. The dam device according to claim 1, wherein the upper end of the vertical member is positioned below the lowest horizontal member among the plurality of horizontal members.

4. The support pillars are provided with a plurality of support portions that protrude toward the vertical members and on which the horizontal members are placed, The dam device according to claim 2, wherein the horizontal member is disposed so as to be sandwiched between the support pillar and the vertical member.

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