JP7529989B2 - Auxiliary components for flood control structures - Google Patents

Description

The present invention relates to auxiliary members that are attached to flood control structures such as levees and dams.

Conventionally, auxiliary members for flood control structures have been disclosed for raising embankments and the like to reduce flood damage. Patent Document 1 discloses an auxiliary member for flood control structures that can be placed on top of an embankment so as to sandwich the embankment in the width direction.

JP 2014-122532 A

Flood control structures such as levees often have slopes on both sides of their width, and the width dimensions of levees vary depending on the river in which they are constructed. Therefore, when installing levees by sandwiching them, auxiliary members of a size appropriate to the levees to be installed must be made individually, making them less versatile.

The objective of the present invention is to provide a versatile auxiliary component for flood control structures.

The auxiliary member for flood control structures of the present invention is characterized in that a water receiving surface having a curved surface and being L-shaped in side view is provided on one wall of a hollow resin double structure, an installation surface is provided on the other wall of the hollow resin double structure, the installation surface having a curved surface and being L-shaped in side view and having a groove portion, and a rib is provided inside the hollow resin double structure connecting the bottom plate of the groove portion to the wall on one side .

The present invention provides a versatile auxiliary component for flood control structures.

1 is a perspective view of an auxiliary member for a flood control structure according to an embodiment of the present invention, seen from one side. FIG. 1 is an oblique view of a flood control structure auxiliary member according to an embodiment of the present invention, viewed from the other side. FIG. 3 is a cross-sectional view of the auxiliary member for a flood control structure according to an embodiment of the present invention taken along line III-III of FIG. 1. 4 is a cross-sectional view of the auxiliary member for a flood control structure according to an embodiment of the present invention taken along line IV-IV of FIG. 3. 3A to 3D are schematic diagrams of essential parts corresponding to the end face III-III in FIG. 1 , showing the process of forming ribs and grooves of an auxiliary member for a flood control structure according to an embodiment of the present invention, in which (a) shows the state in which the mold is clamped, (b) shows the state in which the slide core has been moved, (c) shows the state in which the slide core has been immersed in the mold, and (d) shows the state after air blowing. 1 is a perspective view showing a state in which multiple flood control structure auxiliary members according to an embodiment of the present invention are connected together and used. FIG. 1 is a schematic diagram showing a flood control structure auxiliary member according to an embodiment of the present invention attached to a river embankment. FIG.

Next, an embodiment of the present invention will be described with reference to the drawings. The auxiliary member 10 for flood control structures shown in Figures 1 to 4 has a resin hollow double structure 20 in which a hollow space is formed between the double walls 21, 22. The auxiliary member 10 for flood control structures is formed line-symmetrically by blow molding of a thermoplastic resin. The thermoplastic resin may be, for example, high-density polyethylene resin, low-density polyethylene resin, polypropylene resin, polystyrene resin, ABS resin, nylon resin, polycarbonate resin, polyethylene terephthalate resin, polybutylene terephthalate resin, or engineering plastics such as modified PPO, or blends of these.

The auxiliary member 10 for flood control structures is formed in a roughly L-shaped plate shape when viewed from the side, and is formed in an elongated shape in a direction perpendicular to the side of the roughly L shape (perpendicular to the paper surface of FIG. 4). The auxiliary member 10 for flood control structures is used by installing it on the slope of a levee of a river, etc., as shown in FIG. 6.

As shown in FIG. 1, a water receiving surface 11 is provided on the outer surface of one wall 21 of the resin hollow double structure 20 (in other words, the inner surface or front side of the approximately L-shaped surface in side view). The water receiving surface 11 is formed in an approximately L-shaped surface in side view by connecting two approximately rectangular water receiving body surfaces 11a with a bent surface 11b. The angle between the water receiving body surfaces 11a (i.e., the angle of the bent surface 11b) is set to an obtuse angle. The bent surface 11b is formed in a curved shape. The water receiving surface 11 is bent toward the other wall 22 at two ends of the approximately L-shaped surface in side view, forming an edge surface 11c. The edge surface 11c and the water receiving body surface 11a are smoothly connected at an R-shaped angle. In this way, the water receiving surface 11 is formed smoothly over its entire surface.

As shown in FIG. 2, an installation surface 12 is provided on the outer surface of the wall portion 22 on the other side of the resin hollow double structure 20 (in other words, the outer surface of the approximately L-shape in side view). The installation surface 12 is formed in a generally L-shape in side view by connecting two approximately rectangular installation body surfaces 12a with a bent surface 12b. The portion of the bent surface 12b that connects to the installation body surface 12a is curved, but the surface between the connection portion with the installation body surface 12a is formed to be approximately flat.

The installation surface 12 is provided with a groove 23 and a rib 24 over almost the entire area of the short length direction of the installation surface 12 (in other words, across the bent surface 12b). Here, as shown in FIG. 4, the distance L1 from the center P of the bent portion corresponding to the bent surface 12b in the bottom plate 23a of the groove 23 to the tip Q of the bottom plate 23a is set to 30% or more of the distance L2 from the center P to the tip of the installation surface 12, preferably 50% or more, and more preferably 70% or more. As shown in FIG. 3, the groove 23 is provided so as to widen toward the outside. As shown in FIG. 3 and FIG. 4, the bottom plate 23a of the groove 23 and the wall portion 21 are connected by the rib 24 inside the hollow of the resin hollow double structure 20. The depth dimension of the groove 23 and the height dimension of the rib 24 are appropriately set according to the thickness dimension of the auxiliary member 10 for flood control structures. In this embodiment, the depth dimension of the groove 23 and the height dimension of the rib 24 are set to be approximately the same. The groove 23 and the rib 24 increase the rigidity of the flood control structure auxiliary member 10 against forces in the direction that opens the inside of the approximately L-shape in side view.

Here, when the grooves 23 are molded, the wall thickness of the wall 22 at the connection portion between the grooves 23 and the installation body surface 12a (the opening of the grooves 23) tends to be thin. If the interval W1 (see FIG. 3) of the grooves 23 is close, the wall thickness of the wall 22 tends to be even thinner. However, it is preferable to bring the grooves 23 closer to each other in order to reinforce the auxiliary member 10 for flood control structures. It is also possible to increase the overall thickness, but this is not preferable because it increases the product weight and costs. Therefore, as shown in this embodiment, by using the grooves 23 and the ribs 24 together as reinforcing parts, it is possible to narrow the interval W1 of the grooves 23 (i.e., the interval W1 of the reinforcing parts) shown in FIG. 3 without increasing the thickness of the resin. The relationship between the interval W1 of the reinforcing parts and the depth W2 of the grooves 23 is preferably 1.5≦W1/W2, and more preferably 2≦W1/W2.

Here, the rib 24 is formed in the blow molding of the auxiliary member 10 for flood control structures, as shown in Figs. 5(a) to (d). Figs. 5(a) to (d) are schematic diagrams showing the end face of the cut portion of Fig. 3 and the mold 50. The mold 50 shown in Figs. 5(a) to (d) has a first mold 51 as a female mold having a cavity 51a, and a second mold 52 formed as a male mold corresponding to the cavity 51a. The first mold 51 has a convex portion 51b for forming the concave groove portion 23. The second mold 52 has a slide core 55 connected to a hydraulic cylinder (not shown) for forming the rib 24. The slide core 55 is formed in a thin plate shape and is arranged opposite the convex portion 51b of the first mold 51. The slide core 55 is formed so as to be movable toward the cavity 51a by the hydraulic cylinder. Fig. 5(a) shows a state in which the mold 50 is clamped while maintaining the internal pressure of the parison 60 formed to be hollow inside. By the mold clamping, the parison 60 is formed with the groove 23 by the convex portion 51b. After the parison 60 is clamped, as shown in FIG. 5B, the slide core 55 located inside the second mold 52 is moved toward the cavity 51a. The slide core 55 may be moved toward the cavity 51a before clamping. The movement of the slide core 55 forms a deformation portion 61 protruding into the parison 60. The slide core 55 moves until the deformation portion 61 and the groove 23 come into contact with each other. Since the parison 60 is molten, the deformation portion 61 and the groove 23 are connected. Thereafter, as shown in FIG. 5C, the slide core 55 is returned to the original position (inside the second mold 52), and air is blown into the parison 60. Then, the pressure inside the parison 60 increases, the space N in the deformed portion 24a where the slide core 55 has been removed disappears, and the rib 24 is formed as shown in FIG. 5(d).

As shown in FIG. 1, the auxiliary member 10 for flood control structures is provided with a connecting protrusion 13 at one end in the longitudinal direction. One wall 21 of the connecting protrusion 13 is connected to one wall 21 of the water receiving surface 11 via a step 14. The connecting protrusion 13 is formed in a generally L-shape in side view. The connecting protrusion 13 has a connecting surface 13a that connects to the water receiving main body surface 11a via the step 14, a curved surface 13b that connects to the curved surface 11b, and an edge surface 13c that connects to the edge surface 11c. The connecting surface 13a, the curved surface 13b, and the edge surface 11c are surfaces that are formed on the hollow interior side of the water receiving main body surface 11a, the curved surface 11b, and the edge surface 11c. As shown in FIG. 3, a side plate 25 is formed at one end of the connecting protrusion 13, and a connecting end surface 13d is provided. The outer surface of the other wall portion 22 of the connecting protrusion 13 forms a surface that is continuous with the installation surface 12.

As shown in Figures 2 and 3, the auxiliary member 10 for flood control structures is provided at the other longitudinal end with a connecting recess 15 that is a generally rectangular recess extending from the wall 22 on the other side. The connecting recess 15 is a recess formed by the wall 21 and a side plate 16 that connects the walls 21 and 22. The connecting recess 15 is therefore open on the side of the other longitudinal end and on the wall 22 side. One side of the side plate 16 is the interior side of the hollow space. The side plate 16 is formed so as to slope towards the interior side of the hollow space as it moves from the wall 21 towards the wall 22.

As shown in Figure 3, the connecting convex portion 13 and the connecting recessed portion 15 are formed so as to be able to engage and connect. The connecting convex portion 13 is arranged on the wall portion 22 side (in other words, the back side) of the water receiving surface 11. The length of the connecting convex portion 13 in the longitudinal direction of the auxiliary member 10 for flood control structures is formed to be the same as the length of the connecting recessed portion 15 in the longitudinal direction of the auxiliary member 10 for flood control structures. The side plate 25 of the connecting convex portion 13 is arranged perpendicular to the wall portion 21, but the side plate 16 is arranged at an angle, so that when the connecting convex portion 13 and the connecting recessed portion 15 are connected, a gap s is created between the side plates 25, 16. By setting the dimensional tolerance of the length of the connecting protrusion 13 in the longitudinal direction of the auxiliary member 10 for flood control structures to a minus tolerance of the length of the connecting recess 15 in the longitudinal direction of the auxiliary member 10 for flood control structures, the side edge 11d on the other end side of the water receiving surface 11 and the step 14 can be reliably abutted without considering the effects of warping during molding of the side plate 16. In other words, when the connecting protrusion 13 and the connecting recess 15 are connected, there is no interference between the side plate 25 (connecting end surface 13d) and the side plate 16. The water receiving surface 11 of the connected auxiliary member 10 for flood control structures is also smooth at the portion where the side edge 11d on the other end side of the water receiving surface 11 and the step 14 abut.

Multiple flood control structure auxiliary members 10 connected in this manner are connected as shown in Figure 5. The dashed arrow D indicates the direction of the river flow. The flood control structure auxiliary members 10 are connected to the connecting protrusions 13 so that the connecting recesses 15 are positioned upstream. As a result, the wall portion 21 corresponding to the connecting recesses 15 is deflected toward the connecting protrusions 13 under the water pressure caused by the water flow, so that the back surface of the wall portion 21 in the connecting recesses 15 and the outer surface of the wall portion 21 in the connecting protrusions 13 are in close contact with each other, strengthening the connection between the connecting protrusions 13 and the connecting recesses 15 and reducing water leakage from the connection portion.

The multiple auxiliary members 10 for flood control structures connected in this manner can be attached to the levee T of a river. At this time, by setting the angle between the water receiving body surfaces 11a of the water receiving surfaces 11 to match the inclination angle of the slope of the levee T, the water receiving body surface 11a corresponding to the installation surface 12 that is not installed on the slope can be made perpendicular to the water surface. Since the inclination angle of the slope of the levee T is approximately the same for many levees, there is no need to manufacture the auxiliary member 10 for flood control structures for each river, and the auxiliary member 10 for flood control structures can be made highly versatile. Note that anchor bolts or the like can be used as appropriate to fix the auxiliary member 10 to the levee T. In addition, the water receiving surface 11 corresponding to the installation surface 12 installed on the levee T is subjected to water pressure, so that the auxiliary member 10 for flood control structures is more securely fixed to the levee T.

By attaching the auxiliary member 10 for flood control structures to the levee T, the river's critical water level, which was H1, can be raised to H2. This makes it possible to reduce flood damage to houses L, etc.

As described above, the present invention is not limited to this embodiment, and can be modified as appropriate. For example, the auxiliary member 10 for flood control structures can be attached not only to embankments, but also to other flood control structures such as dams.

10 Auxiliary member for flood control structure 11 Water receiving surface 11a Water receiving main body surface 11b Bent surface 11c Edge surface 11d Side edge 12 Installation surface 12a Installation main body surface 12b Bent surface 13 Connecting protrusion 13a Connecting surface 13b Bent surface 13c Edge surface 13d Connecting end surface 14 Step portion 15 Connecting recess 16 Side plate 20 Resin hollow double structure 21 Wall portion 22 Wall portion 23 Concave groove portion 23a Bottom plate 24 Rib 25 Side plate 50 Mold 51 First mold 51a Cavity 51b Convex portion 52 Second mold 55 Slide core 60 Parison 241 Deformation portion N Space L House T Levee s Gap

Claims (6)

A water receiving surface having a curved surface and formed in an L-shape in side view is provided on one wall of the resin hollow double structure ,
An auxiliary member for flood control structures, characterized in that an installation surface is provided on the other wall portion of the hollow resin double structure, the installation surface has a curved surface formed in an L-shape when viewed from the side and has a groove portion, and a rib is provided inside the hollow resin double structure connecting the bottom plate of the groove portion and the wall portion on one side . The auxiliary member for flood control structures according to claim 1, characterized in that the curved surface is formed at an obtuse angle. The auxiliary member for flood control structures according to claim 1 or 2, characterized in that the water receiving surface is formed smoothly. The auxiliary member for flood control structures according to any one of claims 1 to 3, further comprising a connecting protrusion and a connecting recess that engages with the connecting protrusion, and is formed so as to be connectable. The auxiliary member for flood control structures according to claim 4, characterized in that the connecting recess is formed on the back side of the water receiving surface, and the connecting protrusion is arranged on the back side of the connecting recess so that the connecting protrusion and the connecting recess engage with each other. 6. An auxiliary member for a flood control structure according to claim 1, characterized in that it is formed in axisymmetrical fashion.

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