JPS607091B2 - Weirs for tide protection, wave protection, wave dissipation, prevention of salt water run-up, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weir (levee) for use in tide protection, breakwater, wave dissipation, prevention of salt water run-up, and the like.

Currently, this type of weir (levee) is mainly a fixed weir (levee) or a movable membrane undulating weir (levee) (e.g., Japanese Patent Publication No. 40-11702).
(see Japanese Patent Publication No. 44-2371), and these have the following problems.

In other words, installing fixed weirs at estuaries for the purposes of tide protection, wave protection, wave dissipation, and prevention of saltwater intrusion will impede river flow and boat navigation.

Furthermore, even if constructed as a wave-dissipating levee, it will only become an obstacle to boat navigation when wave-dissipating is not necessary. In addition, when the current undulating weir made of flexible waist is used for purposes such as tide protection, wave prevention, wave dissipation, and prevention of salt water run-up, when waves hit the weir, water moves along the curved surface of the undulating weir and overflows the weir. The present invention has been made to solve the above problems.The present invention has been made in which an undulating canopy made of a flexible membrane is used for purposes such as tide protection, wave protection, wave dissipation, and prevention of salt water run-up, and the top part It completely prevents waves from overtopping by providing a wave return.

The present invention will be explained in detail below with reference to the illustrative drawings.

As shown in FIG. 1, the present invention uses a movable membrane undulating weir to close river mouths, ports, etc., and is used for tide protection, wave protection, wave dissipation, prevention of salt water run-up, and the like. When necessary, the inside of the weir body can be filled with fluid as shown in Figure a to provide tide protection, wave protection, wave dissipation, and prevention of saltwater intrusion, and when it is not needed, the fluid inside the envelope can be discharged to prevent the weir body from collapsing as shown in Figure b. , does not impede river flow, boat navigation, etc. The structure of this weir body itself is, for example, the above-mentioned Japanese Patent Publication No. 40111702, Japanese Patent Publication No. 4
No. 4-2371 etc., it is completely known.

In Fig. 1, 1 is a movable membrane envelope, 2 is, for example, the floor of an estuary, 3 is an inlet/exhaust (water) pipe, 4 is a fluid such as air, water, or both, 5 is an upstream river, 6 shows waves on the sea surface, for example. In the above, the present invention particularly provides a ripple 7 at the top of the weir body formed by the envelope 1 into which the fluid is fed, as shown in FIG.

This wave return is completely prevented. In other words, when waves hit an undulating weir, the waves are divided into two types: those that are reflected by the collision and those that climb along the curved surface of the weir. When the main wave returns, the water that climbs up the curved surface of the weir is reflected, completely preventing wave waves. It is also effective for raising the height of the wave weir. Note that various materials, shapes, sizes, etc., can be used for this wave. Also, it may be integrated with the undulating weir, and a part of the undulating weir may have unevenness,
It may also be one that is attached to an undulating weir. Specific examples of the undulating weir of the present invention provided with wave returns will be described below.

Specific example 1 A undulating weir made of a flexible membrane with a separate wave return As shown in Fig. 3, a cylindrical foam 8 is covered with a flexible sheet 9, and this sheet forms the main body of the undulating weir. This is what was pasted on envelope 1.

Concrete Example 2: A undulating weir made of a flexible and transparent membrane is provided with a wave return that is integrated with the envelope.As shown in Figure 4, a part of the undulating weir is provided with protrusions that serve as wave returns.

In this case, if a fluid flow port is provided in section 10 in the direction across the river, the wave return will swell at the same time when the weir expands (Figure a), and when the weir collapses, the wave return will also contract, resulting in the complete collapse of the weir as shown in Figure b. is possible, and does not impede river flow without reducing the river cross-sectional area. In the above case, the wave return is also a movable membrane envelope (bag-like body) similar to the main sacrificial membrane envelope. The weir of the present invention as described above has the following advantages.

■ Since it uses an undulating weir made of flexible membrane, it can be used for tide protection, wave protection, wave dissipation and prevention of saltwater run-up when necessary. Also, it does not obstruct river flow or boat navigation when unnecessary. ■ It is effective in preventing waves from overtopping since it is equipped with a wave return. It will also raise the height of the weir.

[Brief explanation of the drawing]

The drawings are all cut along the flow direction of the river when a undulating weir made of a flexible membrane is used for wave protection. Figure b shows the situation when it is needed, Figure b shows the situation when it is not needed, Figures 2 to 4 show the case when the undulating weir made of flexible membrane of the present invention is used, Figure 2 is a diagram explaining the principle, and Figure 3 shows the situation when it is not needed. If a separate barb is attached, FIG. 4 illustrates the case where an integral barb is attached to the envelope. 1.0 fusible membrane envelope, 24. floor, 311 air (water) pipe, 41. fluid (e.g. air, water, or both);
5... Upstream river, 5'... River, 6... Wave, 711 wave return, 81... Foam, 9, 'Movable sheet, 10... Part. Fang 1 figure O 2 spear figure 3 spear figure

Claims (1)

[Scope of Claims] 1. A flexible membrane envelope forming a weir body is attached to at least the floor in a direction transverse to the flow, and a fluid is injected into the envelope to cause it to expand and stand up, or a fluid is pumped from inside the envelope. A undulating weir that can be discharged, contracted, and collapsed, and is characterized by having a wave return at the top of the weir body where fluid is injected and an envelope is formed. , a weir to prevent salt water from running up. 2. A weir for tide protection, wave protection, wave dissipation, prevention of salt water run-up, etc., as set forth in claim 1, which is provided with a separately formed wave return in the envelope. 3. A weir for tide protection, wave protection, wave dissipation, prevention of salt water run-up, etc. as set forth in claim 1, which is provided with a wave return integrally formed in the envelope. 4. The wave return is also a flexible membrane envelope into which a fluid for expansion and contraction is injected and discharged from inside the flexible membrane envelope of the main body. Weirs for tide protection, wave protection, wave dissipation, prevention of salt water intrusion, etc. as described in Section 1.