Dams, protective components, and construction methods for dams

Abstract

The present invention provides a dam, protective members, and a construction method for a dam that can improve the work efficiency of removing captured objects. [Solution] The weir 1 is a weir installed in a river to capture an object, and comprises a horizontal member 32 extending along the Y direction, which is the direction that crosses the river; a vertical member 31 connected to the horizontal member 32 and having an upright portion 313 that protrudes above the horizontal member 32 as a projection, extending along the Z direction, which is the vertical direction; and a protective member 4 having a bottomed cylindrical cap portion that covers at least the upright portion 313.

Description

Technical Field

[0001] The present invention relates to a levee, a protection member for a levee, and a method for constructing a levee.

Background Art

[0002] Conventionally, in order to enhance the capturing function for driftwood, rocks, etc., a levee has been proposed in which a capturing body is newly installed on an existing main body (see, for example, Patent Document 1). In the levee described in Patent Document 1, the capturing body includes a plurality of column portions and connecting beams that connect the column portions to each other, and is configured to capture driftwood, rocks, etc.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a levee as described in Patent Document 1, when the capturing body captures driftwood, rocks, etc. during water discharge, it is preferable to remove the captured objects after water discharge to make it possible to capture again. Since the captured objects are relatively large or heavy, it is difficult for workers to remove them manually, and it is necessary to use heavy machinery. When using heavy machinery, if a bucket or the like comes into contact with a part of the levee, it may cause damage or deformation, etc., so careful work is required and the workability tends to decrease.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a levee, a protection member, and a method for constructing a levee that can improve the workability of the work for removing captured objects.

Means for Solving the Problems

[0006] To achieve the above objective, the weir according to the present invention is a weir installed in a river to capture an object, and is characterized by comprising: a horizontal member extending in a direction transverse to the river; a vertical member connected to the horizontal member and having a protruding portion that protrudes above the horizontal member and extending in a vertical direction; and a protective member having a bottomed cylindrical cap portion that covers at least the protruding portion.

[0007] In a weir according to one aspect of the present invention, the cap portion has a cylindrical portion and a projection that protrudes from the cylindrical portion toward the upstream side of the river.

[0008] In a weir according to one aspect of the present invention, the cap portion is formed in a cylindrical shape having an opening at one end and has a mounting groove formed therein, the mounting groove having an introduction portion that extends along the direction of extension of the cylinder and is continuous with the opening, and a fixing portion that extends along the circumferential direction of the cylinder and is continuous with the end of the introduction portion opposite to the opening, the fixing portion having a cap-side fixing portion at the end of the fixing portion opposite to the introduction portion, and the protruding portion having a column-side fixing portion that can pass through the mounting groove and can be connected to the cap-side fixing portion.

[0009] In a dam according to one aspect of the present invention, the protective member is made of metal or rubber.

[0010] To achieve the above objective, the protective member according to the present invention is a protective member for a weir installed in a river to capture an object, comprising a horizontal member extending in a direction crossing the river and a vertical member connected to the horizontal member and extending in a vertical direction, characterized in that it has a bottomed cylindrical cap portion that covers at least the protruding portion of the vertical member that protrudes above the horizontal member.

[0011] To achieve the above objective, the present invention provides a method for constructing a weir that is installed in a river to capture an object, comprising a horizontal member extending in a direction crossing the river and a vertical member connected to the horizontal member and extending in a vertical direction, characterized in that a protective member is provided for at least a protruding portion of the vertical member that protrudes above the horizontal member, and the protruding portion is covered by a bottomed cylindrical cap portion of the protective member. [Effects of the Invention]

[0012] According to the weir, protective member, and construction method of the weir according to the present invention, the work efficiency of removing captured objects can be improved. [Brief explanation of the drawing]

[0013] [Figure 1] This is a front view showing a dam according to an embodiment of the present invention. [Figure 2] This is a perspective view showing how a protective member covers a protruding portion in a dam according to an embodiment of the present invention. [Figure 3] This is a perspective view showing a protective member for a dam according to an embodiment of the present invention. [Figure 4] This is a side view showing the mounting structure of a protective member in a dam according to an embodiment of the present invention. [Figure 5] This is a front view showing the mounting structure of a protective member in a dam according to an embodiment of the present invention. [Figure 6] This is a plan view showing the mounting structure of a protective member in a dam according to an embodiment of the present invention. [Figure 7] This is a perspective view showing a protective member of a modified example of the present invention. [Figure 8] This is a perspective view showing a modified example of the protective member mounting structure of the present invention. [Figure 9] A perspective view showing a protective member of another variation of the present invention. [Modes for carrying out the invention]

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a weir 1 according to an embodiment of the present invention, FIG. 2 is a perspective view showing a state where a standing portion 313 as a protruding portion is covered by a protection member 4 in the weir 1, FIG. 3 is a perspective view showing the protection member 4, FIG. 4 is a side view showing an attachment structure of the protection member 4 in the weir 1, FIG. 5 is a front view showing the attachment structure of the protection member 4 in the weir 1, and FIG. 6 is a plan view showing the attachment structure of the protection member 4 in the weir 1.

[0015] As shown in FIGS. 1 and 2, the weir 1 according to an embodiment of the present invention is a weir provided in a river to capture an object, and includes a cross member 32 extending along the Y direction, which is the direction across the river, and a vertical member 31 connected to the cross member 32 and having a standing portion 313 as a protruding portion protruding above the cross member 32 and extending along the Z direction, which is the vertical direction, and a protection member 4 having a bottomed cylindrical cap portion covering at least the standing portion 313.

[0016] The weir 1 includes a main body 2, a capturing body 3, and a protection member 4. Hereinafter, the direction across the river along the horizontal plane is defined as the Y direction, the vertical direction is defined as the Z direction, and the direction orthogonal to both the Y direction and the Z direction (the flow direction of the river when viewed from the Z direction) is defined as the X direction. In FIG. 1, the river flows from the front side of the paper surface toward the back side, and in FIG. 2, the flow direction of the river is indicated by an arrow R. Also, although the X direction may not coincide with the flow direction of the river, the upstream side of the river is defined as the upstream side in the X direction, and the downstream side of the river is defined as the downstream side in the X direction. Further, the upstream side and the downstream side in the X direction may be simply referred to as the upstream side and the downstream side, and the upper and lower sides in the Z direction may be simply referred to as the upper and lower sides.

[0017] The main body 2 is a structure made of concrete, soil cement, or the like, and has sleeve portions 21 extending from both banks of the river toward the center. The sleeve portions 21 have an upstream wall portion 23 facing the upstream side and a downstream wall portion facing the downstream side, and a concave water passage portion 22 is formed at the upper end portion and the central portion of the river. The upstream wall portion 23 and the downstream wall portion are inclined so as to approach each other upward.

[0018] The capture body 3 is provided on the upstream wall portion 23, that is, it is arranged on the upstream side with respect to the main body 2, and has a plurality of vertical members 31, a horizontal member 32, and side portions 33.

[0019] The vertical member 31 is a column member formed of, for example, a steel pipe, and has a first leg portion 311, a second leg portion 312, and a standing portion 313, and is formed in a bifurcated shape, and extends along the Z direction as a whole.

[0020] The lower ends of the first leg portion 311 and the second leg portion 312 are fixed to a portion of the upstream wall portion 23 below the water passage portion 22 via anchor bolts and nuts, and extend obliquely upward toward the upstream side as they go upward from the upstream wall portion 23. The fixing position of the second leg portion 312 with respect to the upstream wall portion 23 is located above the fixing position of the first leg portion 311, and the second leg portion 312 has an inclination angle closer to the horizontal direction than the first leg portion 311.

[0021] The upper end of the second leg portion 312 is connected to a portion of the first leg portion 311 below the upper end (a portion below the connection portion with the horizontal member 32 described later). Also, the first leg portion 311 is longer than the second leg portion 312. Thereby, the first leg portion 311 and the second leg portion 312 are connected in an L shape.

[0022] The standing portion 313 is connected to the upper end of the first leg portion 311 and extends upward along the vertical direction.

[0023] Among the plurality of vertical members 31 as described above, the vertical members 31 arranged at both ends in the Y direction are arranged on the edge side (bank side) of the river than the water passage portion 22, that is, the width (dimension in the Y direction) of the capture body 3 is wider than the width of the water passage portion 22.

[0024] The horizontal member 32 is a beam member formed, for example, from a steel pipe, and connects multiple vertical members 31 to each other by being connected near the upper end of the first leg portion 311. The connection point between the horizontal member 32 and the first leg portion 311 is located above the connection point between the first leg portion 311 and the second leg portion 312. Furthermore, the entire upright portion 313 is located above the horizontal member 32, and the upright portion 313 is a protruding portion that extends above the horizontal member 32.

[0025] In this embodiment, each vertical member 31 has a projection that extends integrally from both sides in the Y direction, and the flange portions provided at the tips of these projections are connected to form the horizontal member 32. The horizontal member only needs to extend along the Y direction and connect the vertical members, and the specific connection structure of each part is not limited to the above form.

[0026] The lateral section 33 has a lateral beam section 331 extending along the X direction and a lateral upright section 332 erected above the lateral beam section 331. The lateral beam section 331 is connected to the vertical members 31 at the Y-direction end of the plurality of vertical members 31 at the same height as the horizontal members 32, and the opposite end is fixed to the upstream wall section 23 via anchor bolts and nuts.

[0027] For the connections between each part of the capture body 3 as described above, a structure that allows for attachment and detachment by connecting flanges with bolts, or a structure that is fixed by welding, can be appropriately adopted.

[0028] As shown in Figure 3, the protective member 4 is formed in a bottomed cylindrical shape, having a cylindrical tube portion 41 and a bottom plate portion 42 provided at one end of the tube portion 41, and the entire protective member 4 serves as a cap portion. The protective member 4 as a cap portion has an opening 411 at one end and is formed in a cylindrical shape, as will be described later. Furthermore, the entire protective member 4 is formed as a single component from rubber.

[0029] The inner diameter of the cylindrical portion 41 is slightly larger than the outer diameter of the upright portion 313, which acts as a protruding part, and the length of the cylindrical portion 41 is approximately the same as the length of the upright portion 313. The other end of the cylindrical portion 41 (the end opposite to the bottom plate portion 42) is an opening 411. This allows the protective member 4 to be placed over the upright portion 313 with the opening 411 facing downwards and the bottom plate portion 42 facing upwards, so that the protective member 4 covers the entire height of the upright portion 313. Note that the protective member 4 only needs to cover, for example, more than half of the height of the upright portion 313, and does not need to cover the entire height.

[0030] The protective member 4, which serves as the cap portion, has a projection 43 that protrudes from the cylindrical portion 41. The protective member 4 is attached to the capture body 3 such that the projection 43 is oriented to protrude upstream into the river. The projection 43 is formed in a plate shape so as to extend over the entire length of the cylindrical portion 41 in the Z direction (i.e., the direction in which the cylindrical portion 41 extends). The projection may be provided only on a part of the cylindrical portion 41 in the Z direction, in which case it is preferable that it is provided at least at the upper end of the cylindrical portion 41 (the end on the side of the bottom plate portion 42).

[0031] The projection 43 may be made of the same material as the cylindrical portion 41 and formed integrally with the cylindrical portion 41, or it may be made of a different material and formed separately from the cylindrical portion 41 and joined together. Furthermore, a cushion portion softer than the other parts may be provided at the tip of the projection 43.

[0032] As described above, flange portions are provided at the connection points of each part of the capture body 3, and in the vertical member 31 and the horizontal member 32, these flange portions are the parts that protrude the most in the X direction. Preferably, the amount of protrusion of the projection 43 is greater than or equal to the length by which the flange portions protrude from other parts in the vertical member 31 and the horizontal member 32. That is, when the protective member 4 is provided on the capture body 3, it is preferable that the projection 43 is the part that protrudes the most toward the upstream side.

[0033] The protective member 4 is provided so as to cover the upright portion 313 of all of the multiple vertical members 31. Furthermore, the protective member 4 may also be provided for the lateral upright portion 332.

[0034] Furthermore, the construction method for the weir 1 equipped with the protective member 4 may involve installing the protective member 4 when constructing a new weir 1, or it may involve adding the protective member 4 to an existing weir equipped with the main body 2 and the trapping body 3.

[0035] Here, an example of the mounting structure for the protective member 4 in the dam 1 will be described based on Figures 4 to 6. The protective member 4 has a fixing projection 44 protruding from the cylindrical portion 41 at the end on the opening 411 side and on the opposite side of the projection 43 in the circumferential direction. The protective member 4 is fixed to the capture body 3 by this fixing projection 44 and the wire rope 100. At this time, the wire rope 100 should be wrapped around so as to resist any force that would pull out the protective member 4. Specifically, on both sides in the Y direction with respect to the vertical member 31 (see Figure 5), the wire rope 100 is wrapped around the horizontal member 32 once, and the wire rope 100 is hooked onto the fixing projection 44 from above (see Figure 4). The wire ropes 100 on both sides in the Y direction may be continuous with each other as shown in Figure 6, or they may be independent of each other. Note that the mounting structure using the wire rope is not limited to the above, and a structure in which through holes are formed in the vertical member 31, the horizontal member 32, and the protective member 4, and the wire rope is inserted through the through holes may also be used.

[0036] Thus, according to the weir 1 of the embodiment of the present invention, by covering the upright portion 313 with the protective member 4, the upright portion 313 can be protected when the object captured by the capture body 3 is removed by heavy machinery. The upright portion 313 is a part of the weir 1 that is easily contacted by heavy machinery, and by protecting this part, the work efficiency of the removal work of the captured object can be improved.

[0037] Furthermore, since the protective member 4 has a projection 43 that extends from the cylindrical portion 41 toward the upstream side of the river, heavy machinery can easily protrude onto the projection 43, and parts of the capture body 3 other than the upright portion 313 can also be protected. At this time, the worker can work by positioning the bucket of the heavy machinery along the projection 43, and can improve the work efficiency of removing the captured object while keeping the bucket as close as possible to the capture body 3. At this time, since the projection 43 extends along the Z direction, the bucket can be guided in the Z direction by the projection 43.

[0038] Furthermore, because the protective member 4 is made of rubber, it can absorb impact when it comes into contact with heavy machinery, thereby reducing the impact on the heavy machinery.

[0039] Furthermore, the present invention is not limited to the embodiments described above, and includes other configurations that can achieve the objectives of the present invention, including modifications such as those shown below. For example, in the above embodiments of the present invention, the protective member 4 is fixed to the capture body 3 using a wire rope 100, but other fixing methods may be employed. As an example of other fixing methods, modified examples are shown in Figures 7 and 8. The protective member 4, which serves as the cap portion, has a mounting groove 45. The mounting groove 45 has an introduction portion 451 that extends in the Z direction (the direction in which the cylinder extends) in continuity with the opening 411, and a fixing portion 452 that extends in the circumferential direction of the cylinder in continuity with the upper end of the introduction portion 451 (the end opposite to the opening 411), and is formed in an L-shape when viewed from the front.

[0040] A cap-side fixing portion 46 is provided at the end of the fixing portion 452 opposite to the introduction portion 451, and the cap-side fixing portion 46 is not shown in Figure 7. The upright portion 313 of the vertical member 31 is provided with a column-side fixing portion 314 that can pass through the mounting groove 45 and can be connected to the cap-side fixing portion 46.

[0041] When inserting the erecting portion 313 into the protective member 4, first, the column-side fixing portion 314 and the introduction portion 451 are aligned in the circumferential direction, and then the protective member 4 is moved downward so that the column-side fixing portion 314 passes through the introduction portion 451. When the column-side fixing portion 314 reaches the upper end of the introduction portion 451, the protective member 4 is rotated so that the column-side fixing portion 314 passes through the fixing portion 452. When the column-side fixing portion 314 reaches the end of the fixing portion 452 opposite to the introduction portion 451, the column-side fixing portion 314 and the cap-side fixing portion 46 are connected.

[0042] With this configuration, the protective member 4 can be easily fixed to the capture body 3, and it is also easier to prevent the protective member 4 from coming off.

[0043] Furthermore, in the above-described embodiment of the present invention, the entire protective member 4 is assumed to be a bottomed cylindrical cap portion, but the protective member only needs to include a cap portion as a part thereof, and other configurations may be added. For example, as shown in Figure 9, another modified example may be a protective member 5 having a cap portion 51 and an additional protective portion 52.

[0044] The cap portion 51, like the protective member 4 in the above embodiment, has a cylindrical portion 511 and a bottom plate portion 512. The additional protective portion 52 is for covering the portion of the vertical member 31 below the horizontal member 32 (the first leg portion 311 in the above embodiment), and is formed by a pair of deformable portions 521. That is, after placing the cap portion 51 over the upright portion 313, the pair of deformable portions 521 are deformed to conform to the outer circumferential surface of the first leg portion 311, thereby protecting the first leg portion 311 as well. In this way, the pair of deformable portions 521 are plate-like portions extending from a common base end, covering the portion of the vertical member 31 below the horizontal member 32. In addition, a connecting portion 53 corresponding to the position of the horizontal member 32 is formed between the additional protective portion 52 and the cylindrical portion 511, so that the deformable portions 521 and the horizontal member 32 do not interfere with each other.

[0045] In addition, depending on the shape of the dam, the type of object to be captured, the method of removing the captured object, etc., if there is a part of the dam that needs to be protected, the protective member may be provided with an appropriate protective part in addition to the bottomed cylindrical cap part.

[0046] Furthermore, although the protective member 4 is made of rubber in the above embodiment, the material of the protective member 4 is not limited to rubber, and may be metal, for example. If the protective member 4 is made of metal, the protective function of the upright portion 313 can be improved. Also, the protective member 4 may be made of resin, or it may be a combination of rubber, metal, resin, etc. as appropriate.

[0047] Although embodiments of the present invention have been described above, the present invention is not limited to the dam according to the above embodiments, but includes all aspects included in the concept and claims of the present invention. Furthermore, each component may be selectively combined as appropriate 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 changed depending on the specific use of the present invention. [Explanation of symbols]

[0048] 1... Dam, 31... Vertical member, 313... Upright section (protruding part), 314... Column-side fixing part, 32... Horizontal member, 4,5... Protective member, 41... Cylinder section, 43... Projection part, 45... Mounting groove, 451... Inlet section, 452... Fixing part, 46... Cap-side fixing part

Claims

1. A weir built in a river to capture an object, A horizontal member extending along the direction crossing the river, A vertical member connected to the horizontal member and having a protruding portion that extends vertically above the horizontal member, A dam characterized by comprising a protective member having a bottomed cylindrical cap portion that covers at least the protruding portion.

2. The weir according to claim 1, characterized in that the cap portion has a cylindrical portion and a projection that protrudes from the cylindrical portion toward the upstream side of the river.

3. The aforementioned cap portion is formed in a cylindrical shape with an opening at one end and has a mounting groove formed therein. The mounting groove has an introduction portion that extends along the direction of the cylinder, continuous with the opening, and a fixing portion that extends along the circumferential direction of the cylinder, continuous with the end of the introduction portion opposite to the opening, and a cap-side fixing portion is provided at the end of the fixing portion opposite to the introduction portion. The weir according to claim 1 or 2, characterized in that the protruding portion is provided with a column-side fixing portion that can pass through the mounting groove and can be connected to the cap-side fixing portion.

4. The dam according to claim 1 or 2, characterized in that the protective member is made of metal or rubber.

5. A protective member for a weir installed in a river to capture an object, comprising a horizontal member extending in a direction crossing the river and a vertical member connected to the horizontal member and extending in a vertical direction, A protective member characterized by having a bottomed cylindrical cap portion that covers at least the portion of the vertical member that protrudes above the horizontal member.

6. A method for constructing a weir in a river to capture an object, comprising a horizontal member extending in a direction crossing the river and a vertical member connected to the horizontal member and extending in a vertical direction, A method for constructing a dam, characterized in that a protective member is provided for any protruding portion of the vertical members that protrudes above the horizontal members, and the protruding portion is covered by a bottomed cylindrical cap portion of the protective member.

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