JP2004076528A - Bank body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bank body for restraining a construction cost, and preventing reduction in the strength of a revetment. <P>SOLUTION: A plurality of columns 16 are arranged at intervals in the lengthwise direction of the revetment 10 on the revetment 10. A film structure 18 is stretched between these columns 16. The columns 16 can be housed in the revetment 10. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to embankments.
[0002]
[Prior art]
Rivers are provided with seawalls to prevent flooding. However, due to rising water levels due to global warming and the like, the current coastal and river revetments are not high enough and may overflow.
However, raising the seawall worsens the landscape. Furthermore, in recent years, there has been a strong demand for coexistence with nature, and there is also a demand for preventing overflow in a state close to nature.
Japanese Patent Application Laid-Open Nos. Hei 8-284139 and Hei 10-280357 propose a structure in which a levee body rises with a river water level to prevent overflow of a river bank.
5 and 6 show an example of a conventional structure. Reference numeral 1 denotes a revetment formed along the river, and reference numeral 2 denotes a water storage tank provided inside the revetment 1. A levee body 5 is inserted into the water tank 2, and when the water level of the river rises and water enters the water tank 2, the levee body 5 rises by buoyancy, and as shown in FIG. It rises more and prevents overflow.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional embankment, it is necessary to embed the embankment in the revetment of the entire area where flooding is expected. For this reason, there was a problem that the construction cost was increased and the structural protection was weakened because the seawall was hollow throughout the entire area.
[0004]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a levee body that can reduce construction costs and prevent a decrease in strength of a seawall.
[0005]
[Means for Solving the Problems]
The embankment according to claim 1, wherein a plurality of struts are arranged at intervals on the revetment along the longitudinal direction of the revetment, and a membrane structure is stretched between the struts. I do.
[0006]
In the present invention, the water at the water level up to the height of the membrane structure can be supported by the pillars and the membrane structure stretched between the pillars. The struts can be fixed, detachable, or usually housed in a revetment and raised when needed. In any case, it is not necessary to embed the embankment throughout the revetment unlike the conventional case. Further, the membrane structure may be of a detachable type.
[0007]
According to a second aspect of the present invention, in the embankment according to the first aspect, the support can be stored in a revetment by moving up and down.
[0008]
In this invention, the landscape is not degraded by storing the pillars in the revetment when not in use. At the time of use, the column is taken out to the ground, but this may be performed manually, or may be performed by buoyancy accompanying a rise in water level or by a method using power.
[0009]
According to a third aspect of the present invention, in the embankment of the first aspect, at least an upper end of the membrane structure is fixed to an upper part of each of the columns.
[0010]
In the present invention, since only the upper end of the membrane structure is fixed to the support, the lower part of the membrane structure is located outside the revetment when the support is stored, and the membrane structure is provided when the support is on the ground. The body receives water pressure while suspended on the column to prevent overflow.
[0011]
According to a fourth aspect of the present invention, in the embankment of the second or third aspect, a cavity is provided in the revetment, and a floating body composed of a plurality of floating body structures is provided in the hollow, and the floating body structure is provided. The body is characterized in that another floating body structure is nested therein, and the pillar is provided in the innermost floating body structure.
[0012]
In the floating body of the present invention, the column is raised by the buoyancy of the floating body. In the floating body according to the present invention, when the fluid flows into the cavity, the floating body structure is sequentially raised, and the column can be raised and lowered with a large stroke. Therefore, the volume of the cavity provided in the revetment can be reduced.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the embankment when not in use, and FIG. 2 is a perspective view of the embankment when in use. 3 is a cross-sectional view of the embankment when not in use, and FIG. 4 is a cross-sectional view of the embankment when in use.
In each of the drawings, reference numeral 10 denotes a river revetment, and reference numeral 11 denotes a storage tank (cavity) provided inside the revetment 10. On the river side of the revetment 10, a headrace channel 12 leading to the storage tank 11 is provided. Above the storage tank 11, an opening 13 that opens to the upper part of the revetment 10 is provided.
The floating body 15 and the support 16 are stored in the storage tank 11 when not in use. As shown in FIG. 3, the floating body 15 is composed of a plurality of floating body structures 15a, 15b, and 15c. 15c are nested. When the water of the river flows into the storage tank 11, the floating body structures 15a, 15b, 15c are sequentially raised, so that the column 16 can be raised and lowered with a large stroke.
A plurality of such storage tanks 11, floating bodies 15, and columns 16 are provided at intervals along the longitudinal direction of the seawall 10.
Further, the upper end of each column 16 is fixed to the upper end of the membrane structure 18.
[0014]
When not in use as shown in FIG. 1, the column 16 is stored in the storage tank 11. The membrane structure 18 is exposed outside the storage tank 11 and is laid on the revetment 10.
As shown in FIGS. 2 and 4, the water of the river flows into the containment tank 11 through the headrace channel 12 when the water is increased. The floating body 15 is extended by buoyancy, and the column 16 is exposed from the opening 13. Since the upper end of the film structure 18 is fixed to the upper end of the column 16, when the column 16 extends from the opening 13, the film structure 18 is put between the columns 16.
As a result, the pressure of the increased river water is supported by the membrane structure 18 and the support 16, and overflow is prevented.
Moreover, since the storage tank 11 does not need to be provided over the entire length of the revetment 10 and is provided discretely at the position where the support 16 is located, the structure of the revetment 10 is not weakened.
In addition, since the floating body structures 15a, 15b, and 15c are sequentially raised, the columns 16 can be raised to a height higher than the height of the storage tank 11. Therefore, since the volume of the storage tank 11 can be reduced, the strength of the revetment can be prevented from lowering.
[0015]
Note that the following modified examples may be used.
The support 16 may not be movable up and down, but may be fixed in a state of being exposed on the revetment 10. Moreover, it is good also as making it detachable from the revetment 10 and attaching the support | pillar 16 to the revetment 10 at the time of use.
Further, in the above example, the support 16 is configured to be exposed by the floating body 15, but the support 16 may be driven using a power source such as electric power.
[0016]
The membrane structure 18 may be stored separately when not in use, and may be attached to the support 16 when in use.
Further, not only the support 16 but also the membrane structure 18 may be accommodated in the revetment 10.
Furthermore, not only the upper end of the film structure 18 is fixed to the support 16, but the entire support 16 may be fixed to the film structure 18.
[0017]
【The invention's effect】
As described above, the following effects can be obtained in the present invention.
According to the first aspect of the present invention, the water pressure is supported by the columns and the membrane structure stretched between the columns. Thus, since it is not necessary to provide a cavity for accommodating the embankment in the entire length of the revetment, the construction cost can be reduced, and the strength of the revetment can be prevented from lowering.
According to the second aspect of the present invention, the columns can be stored in the revetment when not in use, so that the landscape can be prevented from deteriorating.
According to the third aspect of the invention, since only the upper end of the membrane structure is fixed to the support, the lower portion of the membrane structure is located outside the seawall when the support is stored, and the support is located on the ground. When it comes out, the membrane structure can be prevented from overflowing by receiving water pressure while being suspended from the support.
According to the fourth aspect of the present invention, the column can be raised and lowered with a large stroke by the floating body. Therefore, the volume of the cavity provided in the revetment can be reduced, and the strength of the revetment can be prevented from lowering.
[Brief description of the drawings]
FIG. 1 is a perspective view of an embankment shown as one embodiment of the present invention when not in use.
FIG. 2 is a perspective view when the embankment body is used.
FIG. 3 is a cross-sectional view when the embankment is not used.
FIG. 4 is a cross-sectional view at the time of using the embankment body.
FIG. 5 is a view showing a conventional embankment body in a normal state.
FIG. 6 is a view showing a conventional embankment body, in a state where the water level rises and the embankment body rises above the revetment.
[Explanation of symbols]
10 revetment 11 containment tank (hollow)
15 Floating body 16 Prop 18 Membrane structure

Claims (4)

A bank body comprising a plurality of struts arranged on a revetment along the longitudinal direction of the revetment at intervals, and a membrane structure stretched between the struts. In the embankment according to claim 1,
The said pillar can be stored in a revetment by going up and down, The embankment body characterized by the above-mentioned. In the embankment according to claim 1 or 2,
An embankment, wherein at least an upper end of the membrane structure is fixed to an upper part of each of the columns. In the embankment according to claim 2 or 3,
A cavity is provided in the revetment, a floating body composed of a plurality of floating body components is provided in the cavity, and the floating body component has another floating body component embedded therein in a nested manner. An embankment, wherein the support is provided on the floating structure.

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