JPH1037166A - Rising and falling weir - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate a rising and falling means without using power by making a weir body in a rising condition fall down to store energy when water pressure which acts on the weir body exceeds set water pressure and raising the weir body by discharging stored energy when water pressure drops below the set water pressure. SOLUTION: A rising and falling weir consists of a platelike weir body 1 which blocks a river channel and a rising and falling means 2. At the time of normal water level, the weir body 1 which receives moment in the direction of rising and falling due to pressure of stored water is held in a rising condition against water pressure by a weight 9 of the rising and falling means 2, and water at planned stored water level L1 is stored in the upstream. When an amount of water increases and water level reaches a falling down water level, the weir body 1 falls down close to a horizontal level due to water pressure, and stored water flows to the downstream to prevent a flood in the upstream. When water level is reduced, water pressure which the weir body 1 receives is reduced, and the weir body 1 rises due to gravitational force of the weight 9. Moreover, an elastic member such as a spring of which one end is fixed on a stationary member such as ground bed is used instead of the weight 9. Since the weir body 1 does not use a power source, it can fall down without being affected by a power failure and can be installed simply.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an updraft weir installed in a waterway such as a river, standing up in normal times to block the waterway, and falling down when the water rises and the like to flow down the stored water. .

[0002]

2. Description of the Related Art As one type of river weir, there is an updraft weir that rises and falls according to the flow rate of a river. As shown in FIG. 7, this undulating weir is generally constructed by supporting a plate-shaped weir body (31) with a hydraulic cylinder (32) arranged downstream thereof so as to be able to undulate. And the weir body (31) is raised vertically to store water. On the other hand, at the time of rising water, the cylinder (32) is retracted as shown by a two-dot chain line to connect the weir body (31) to the support shaft (34). It lays down horizontally as a center, guaranteeing a certain communication capacity and preventing floods in the basin (the same operation may be performed manually by a combination of screws and handles).

[0003] In addition, as shown in FIG. 8, a rubber bag (33) is normally inflated to block a river, and air is evacuated to raise the bag (33) during flooding. There are also undulating weirs that shrink to ensure a certain level of communication capacity.

[0004]

However, in the structure shown in FIG. 7, it is necessary to drive the hydraulic cylinder (32) when the dam body (31) stands up and down, and in the structure shown in FIG. It is necessary to drive the compressor to expand and contract the body (33). As described above, any structure requires power to raise and lower the weir body (31), so that there is a disadvantage in that the operation of raising and lowering the weir becomes impossible at the time of a power failure or the like, and the reliability of the operation is poor. Such a drawback is problematic in the event that a flood due to heavy rain or the like is likely to cause a power outage at the same time.

[0005] Further, since a power source is required, the equipment tends to be large-sized and complicated, and it is necessary to frequently perform maintenance and inspection, so that construction costs and maintenance costs rise.
Therefore, it is not suitable for installation at a plurality of small and medium rivers in a city, regardless of whether it is installed at one place of a large river.

Accordingly, an object of the present invention is to make it possible to raise and lower the dam body without using a power source, to simplify the structure, and to reduce construction costs and maintenance costs.

[0007]

In order to achieve the above object, according to the present invention, a water storage weir supported so as to be able to undulate and resist water pressure acting on the weir body until the water pressure reaches a set water pressure. When the weir body is held upright, and when the set water pressure is exceeded, the weir body is allowed to lie down and accumulate energy using this loosing movement.After that, when the water pressure falls below the set water pressure, the accumulated energy is used. An up-and-down means for releasing the weir body to return to the upright state is provided.

As the undulating means, there are conceivable means utilizing the potential energy of the weight cone and means utilizing the elastic energy of the elastic body.

[0009] Specifically, in order to utilize potential energy, one end of a flexible strip supported by a pulley is attached to a weir body, and a heavy cone is hung at the other end. The structure is to pull the body in the upright direction.

In order to utilize the elastic energy, an elastic member is interposed between the weir and the stationary member, and the elastic body is urged in the upright direction by the elastic force of the elastic body.
Here, the “stationary member” refers to the ground or a structure fixed to the ground, for example, a foundation of a weir.

It is desirable to provide a notch at the bottom of the weir to serve as a sand discharge port. In this case, a pair of guide weirs that are narrower toward the downstream side are provided on the riverbed from the upstream side of the weir body to immediately below the weir body, and the guide weir is used to cut off the underwater sand drift by the notch for the sand discharge. It is good to guide to the department.

[0012] It is desirable to sequentially dispose an energy-purifying purifying means, a sand basin, and a floor stop having a coarse-grained material downstream of the weir body.

[0013]

1 and 2 show a basic configuration of an up / down weir according to the present invention. As shown in the figure, this undulating weir is composed of a plate-shaped weir body (1) arranged on a river channel so as to close it, and undulating means (2) for undulating the weir according to the amount of water. .

The weir body (1) is rotatably supported by a support shaft (3) extending in a direction perpendicular to the river channel and disposed below a central portion of the weir body (1). ) And the lying position (see FIG. 2). As shown in FIG. 3, the weir body (1) has a notch (5)
It is formed in a substantially rectangular plate shape provided with (6). The upper notch (5) is provided so that a certain amount of water can flow downstream even when the water is stored, and the deepest part is the planned water storage level (L ₁ :
Below normal water storage level). The lower notch (6) serves as a discharge port for quicksand, and prevents sediment from accumulating upstream of the weir (1). The shape and number of these upper and lower cutouts (5) and (6) are arbitrary, and are appropriately determined according to the flow rate and river width of the river or the required flow rate on the downstream side. If notches (5) and (6) are provided in the center of the weir body (1) in the river width direction as shown in the figure, running water can be collected in the center of the river channel, which is effective in preventing scouring of seawalls and the like. Play.

The undulating means (2) rotatably supports the pulley (7) above and upstream of the weir (1), and the pulley (7) has a flexible strip (8), for example, Hang a steel rope, etc., and attach a weight cone (9) to one end (upstream end) of the strip (8).
And the other end (downstream end) is attached to the upper end (above the support shaft (3)) of the dam body (1). As shown in FIG. 5, for example, it is preferable that a pair of the undulating means (2) is provided at both ends in the river width direction of the weir (1). Is set arbitrarily. In addition, as will be described later, the weight cone (9) has a weir body (1) against the water storage pressure (including not only the water pressure but also the pressure due to suspended matter such as lumber) at the planned water level (L ₁ ). Is set to a weight such that the dam body (1) can reliably fall when a predetermined falling water level (L ₂ ) is reached.

The undulating means (2) may be housed in a storage room (not shown) or may be exposed to the outside without being arranged in the room. In the former case, there is an advantage that it is possible to avoid the fear of misoperation or malfunction due to wind, rain and snow, and in the latter case, the operating state of the undulating means (2) can be easily visually confirmed from the outside.

In the above configuration, at the time of the flat water shown in FIG. 1, the weir body (1) which receives the moment in the falling direction by the water storage pressure is pulled in the opposite direction by the gravity of the weight cone (9), and resists the water pressure. It is held upright. As a result, water at a predetermined planned storage level (L ₁ ) is stored upstream. On the other hand, as shown in FIG.
When the preset falling water level (L ₂ ) is reached, the increased water pressure causes the weir body (1) to fall close to horizontal (the consequent lifting of the weight cone (9)). As a result, the stored water can be circulated downstream, and flooding on the upstream side can be prevented. When the rain stops and the water level drops and the water pressure received by the weir body (1) decreases, the gravity of the weight cone (9) causes the weir body (1) to gradually rotate in the upright direction, and then to stand upright as before. (FIG. 1).

The falling water level (L ₂ ) can be set to an arbitrary level by adjusting the weight of the cone by changing the weight of the cone (9) or the like.

As described above, according to the present invention, the water pressure acting on the weir body (1) is maintained against the water pressure until the water pressure acting on the weir body (1) reaches the set water pressure. Energy (potential energy) is accumulated by using the lodging motion while allowing the lodging motion of the weir body (1), and then, when the water pressure falls below the set water pressure, the accumulated energy is released to release the weir body (1). It is to return to the standing state. Therefore, other undulating means can be selected as long as such energy can be stored and released. FIG. 4 shows an example of this. Instead of the weight cone (9), an elastic member (11) such as a spring having one end fixed to a stationary member (10) such as the ground is used. The weir (1) is raised and lowered using elastic energy. In this case, the other end of the elastic member may be directly attached to the dam body (1) without interposing the flexible strip (8).

FIGS. 5 and 6 show an example of a structure in which the above-mentioned undulating weir is applied to a small or medium-sized river. (1 in FIG. 5)
3) is a river bank and (14) is a bank.

A pair of thin guide weirs (15) are provided along the riverbed from the upstream side of the weir (1) to immediately below the weir (1). The guide weir (15) is arranged to enhance the sand discharging function, and the interval between the guide weirs (15) becomes narrower toward the downstream side. The sediment near the riverbed is guided and collected by the guide weir (15), and is discharged to the downstream side of the weir (1) through the lower notch (6) serving as a sand discharge port of the weir (1). You. If the space between the guide weirs (15) becomes narrower toward the downstream side in this way, a nozzle is formed between the guide weirs (15) and (15), and the flow velocity in this part becomes faster than in other parts. Can be efficiently discharged to the downstream side of the weir body (1).

Downstream of the weir (1), a deenergizing means (17) is arranged adjacent to the weir (1). As the deenergizing and purifying means (17), those having a coarse-grained material, for example, those obtained by stacking large cobblestones, or baskets woven in a lattice shape (16)
The thing which stored the crushed stone inside is used. By means of the deenergizing and purifying means (17), the water flow that has fallen from the upper notch (5) is deenergized, and the scouring of the riverbed is prevented. Waterborne substances are adsorbed while passing, which helps to purify rivers.

A sand basin (19) is disposed downstream of the deenergizing and purifying means (17) with a partition wall (18) interposed therebetween. The water flowing through the upper end of the partition wall (18) flows into the sand basin (19),
Here, the flow rate is reduced to settle the sand. The sand accumulated in the deenergizing and purifying means (17) flows into a sand basin (19) through a sand flow path (20) provided at a lower portion of the partition wall (18), and then settles. Therefore, clogging of the deenergizing and purifying means (17) is prevented, and as a result, the frequency of replacement of the deenergizing and purifying means (17) can be reduced. The sand accumulated in the sand basin (19) is periodically scooped and collected. On the downstream side of the sand basin (19), a floor stop (21) will be provided from the viewpoint of stabilizing the flow by stabilizing the water flow and preventing scouring.

These deenergizing and purifying means (17), sand basin (19)
And the floor stop (21) makes it possible to maintain the planned longitudinal slope of the river channel for a long time.

As described above, according to the undulating weir, potential energy and elastic energy are used for undulating the weir body (1), and no power source is used, so that the weir body (1) is not affected by a power failure or the like. ) Can be raised and lowered, and stable operation can be ensured. In addition, since there is no power source, installation work can be performed easily and at low cost, and maintenance and inspection are easy, so that maintenance costs can be reduced.

As described above, the undulating weir of the present application is characterized by a simple structure and low cost, and is convenient when many dams are installed in small and medium-sized rivers such as cities. In this way, arranging undulating weirs and storing water in urban rivers secures a natural environment rich in hydrophilicity and habitat for fish and shellfish, exerts a buffering action against daily temperature changes, and provides fire protection water and It can secure domestic water for disasters such as earthquakes and use it to recharge groundwater during rainfall.

In the above description, the case where the present invention is applied to a river is exemplified. However, the present invention is not limited to this, and can be widely applied to general waterways such as agricultural and industrial waterways.

[0028]

As described above, according to the present invention, since a power source is not used for raising and lowering the weir, it is possible to raise and lower the weir without being affected by a power failure or the like, and to ensure stable operation. Can be. In addition, since there is no power source, installation work can be performed easily and at low cost, and maintenance and inspection are easy, so that maintenance costs can be reduced.

As described above, the undulating weir of the present application is characterized by a simple structure and low cost, so that it is convenient when many dams are installed in small and medium-sized rivers such as cities and the like. It is an effective measure to improve the river environment while meeting the demands of the river.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the basic structure of an undulating weir according to the present invention (standing state).

FIG. 2 is a cross-sectional view showing the basic structure of the undulating weir according to the present invention (in a laid state).

FIG. 3 is a front view of a weir body.

FIG. 4 is a sectional view of an embodiment using an elastic member as the undulating means.

FIG. 5 is a plan view showing a peripheral structure of the undulating weir.

FIG. 6 is a cross-sectional view showing a peripheral structure of the undulating weir.

FIG. 7 is a sectional view of a conventional undulating weir.

FIG. 8 is a cross-sectional view of a conventional undulating weir.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Undulating weir 2 Undulating means 3 Support shaft 5 Upper notch part 6 Lower notch part 7 Pulley 8 Strip 9 Weight cone 10 Stationary member 11 Elastic member 15 Guide dam 16 Basket 17 Energy-saving purifying means 19 Sand basin 21 Floor stopper

Claims (8)

[Claims] 1. A weir for water storage, which is supported so as to be able to rise and fall, holds the weir in an upright state against the water pressure until the water pressure acting on the weir reaches a set water pressure. When the water pressure exceeds the set water pressure, the stored energy is released and the stored energy is released to return the weir to the upright state. The undulating weir provided. 2. The weir according to claim 1, wherein the undulating means utilizes potential energy of a heavy cone. 3. The flexible strip supported by the pulley is attached at one end to a weir body, and a weight cone is hung at the other end, and the gravity of the weight cone pulls the weir body upright. Undulating weir. 4. The up / down weir according to claim 1, wherein the up / down means utilizes the elastic energy of the elastic body. 5. The undulating weir according to claim 4, wherein an elastic member is interposed between the dam body and the stationary member, and the elastic body urges the dam body in the rising direction. 6. The undulating weir according to claim 1, wherein a notch portion serving as a sand discharge port is provided in a lower portion of the weir body. 7. A pair of guide weirs narrowing toward the downstream side are provided on a riverbed from the upstream side of the weir body to immediately below the weir body. The undulating weir according to claim 6, which is guided to the notch. 8. The up-and-down weir according to claim 1, wherein a damping and purifying means having a coarse-grained material, a sand basin, and a floor stop are sequentially arranged downstream of the weir body.