JP2013185415A - Submerged dyke revetment construction method for sea route - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a submerged dyke revetment construction method which prevents floating mud from being accumulated in a sea route.SOLUTION: In a submerged dyke revetment construction method for a sea route, a submerged dyke is constructed by longitudinally arranging submerged dyke units on shoulder sections on both the sides of the sea route, through the use of the submerged dyke unit which has an anchor provided at a lower end of a rubber plate or a wooden plate, having an upper part provided with a float, and/or the triangular submerged dyke unit which has a body of a triangular prism-shaped form covered with a wire net and which has a plate-like body or a sheet film body suspended from the internal top of the triangular prism-shaped form.

Description

The present invention relates to a submerged embankment revetment method for preventing fine particles (floating mud) such as mud and silt carried by waves and tides from flowing into a channel.

Conventionally, harbors have been provided with recesses to secure the route so that even large ships can navigate. However, since fine particles such as mud and silt accumulate in the channel due to the flow of waves and tides, if the water depth is shallow and left unattended, the bottom of the ship will come into contact with the channel and navigation will be impossible. Become. Therefore, in the past, the route was dredged again after some time, but enormous time and expense were required. In recent years, as another construction method, as shown in FIG. 1, a construction method in which inverted T-shaped concrete blocks 2 are built on both sides of the channel 1 has been performed.

The inverted T-shaped concrete block 2 has been provided in a row on both sides along the route to prevent the inflow of floating mud into the route. However, when multiple rows of inverted T-type concrete blocks 2 that are thought to be able to reduce the amount of recent floating mud entering the channel, the construction period becomes long and enormous construction costs are required ( (See non-patent literature).

"Kyushu Port and Airport Technology Development Vision-Port and Airport Technology Development Plan in the Kyushu Region-Page 16 (issued by the Ministry of Land, Infrastructure, Transport and Tourism Kyushu Regional Development Bureau Port and Airport Division 2008)"

Therefore, the present inventor conducted various studies on effective means and construction methods for preventing sedimentation of floating mud in the channel with a short construction period and low construction costs, and as a result, completed the present invention. It was.

The present invention provides a submerged dike unit in which an anchor is provided at the lower end of a rubber plate or a wooden plate provided with a float at the top and / or a body of a triangular prism mold frame, and a wire mesh is stretched from the top inside the triangular prism mold frame. A submerged dike of a channel that uses a triangular submerged unit suspended from a plate or sheet membrane and constructs a submerged dike arranged in multiple rows by arranging the submerged units in the longitudinal direction on the shoulders on both sides of the channel. Revetment method.

According to the submerged dike revetment method of the present invention, the construction period is short and construction can be performed at a low construction cost, and accumulation of floating mud etc. is prevented for a long period of time compared to a submerged dike made of a conventional inverted T type concrete block. can do. Moreover, when it becomes necessary to replace the submerged dike by the method of the present invention, it can be easily replaced. Furthermore, the height of the submerged levee can be easily adjusted in consideration of the influence of tidal currents.

Sectional view of the channel when a submerged dike with a conventional inverted T-shaped concrete block is installed Perspective view of a plate-shaped submerged dike unit using a raw rubber-filled rubber plate with a float at the top Side view of the plate-shaped submerged dike unit of FIG. Side view of a plate-shaped submerged dike unit using a raw rubber-filled rubber plate with a float at the top Perspective view of triangular submerged dike unit Cross section of the route when using a triangular submerged unit and a plate-shaped submerged unit Cross section of the route when using a plate-shaped submerged dike unit Cross section of the route when using inverted T type concrete block and triangular submerged dike unit Sectional view of the channel when using an inverted T-shaped concrete block and a plate-shaped submerged dike unit

As a submerged dike used in the submerged dike revetment method of the present invention, for example, as shown in FIG. 2, a rubber plate 4 with raw cloth is integrated with an anchor [adjustment channel anchor (H-shaped steel)] 3 using bolts, nuts, anchor chains and the like. And constitutes a plate-shaped submerged dike unit. In addition, as shown in FIG. 3, an appropriate number of floats 5 are provided on both side surfaces of the upper part of the raw cloth-containing rubber plate 4 so that the raw cloth-containing rubber plate 4 is kept vertical when installed on the seabed. Furthermore, the float 5 can also be provided in the top part of the rubber plate 4 with a raw cloth as another aspect.

As yet another embodiment, a wooden board can be used in place of the rubber cloth 4 with raw cloth. In this case, since the wooden board itself has buoyancy, the vertical state can be maintained when it is installed on the sea floor without providing a float.

As another submerged dike unit used in the submerged dike revetment method of the present invention, as shown in FIG. The body or sheet film body 9 is suspended to constitute a triangular submerged dike unit. In this submerged unit, since the weight of the formwork plays the role of an anchor, it is not usually necessary to provide an anchor.
Examples of the plate-like body include a rubber plate and a plastic plate. Examples of the sheet film body include a plastic sheet.

In the present invention, a submerged dike can be constructed by installing the submerged dike units as shown in FIGS. 2, 4 and 5 aligned in the longitudinal direction. When constructing a submerged dike, the same submerged dike unit may be provided continuously, but may be provided in combination with other submerged dike units.

When installing in multiple rows using the submerged dike unit, the distance between the submerged dikes is less affected by the flow velocity by maintaining a distance of 5 to 14 times the vertical length of the submerged dike.
Furthermore, the space between the submerged banks where the submerged bank revetment units are installed in multiple rows is partitioned like a water channel, which forms a sediment and storage part (pocket) of the floating mud, concentrating and consolidating the floating mud. Can be increased.

Next, the submerged embankment revetment method of the present invention will be described, but the present invention is not limited to the following description.
FIG. 6 is a cross-sectional view of the vicinity of the channel section. The triangular submerged units A shown in FIG. 5 are arranged in a line along one of the shoulders of the channel 1 along the channel 1, and the plate-shaped submerged unit B shown in FIG. 2 is installed on the shoulder of the other channel 1. Are arranged in a line to construct a submerged dike as shown in FIG.
FIG. 7 is a side view in which a submerged dike is constructed by connecting plate-like submerged dike units B on both sides of the shoulder of the channel 1 along the channel 1.

FIG. 8 shows that a conventionally known inverted T-shaped concrete block C is arranged on the shoulder of the navigation channel 1 at a position close to the navigation channel 1 to construct a first row of submerged dike. In the opposite direction), the triangular submerged dike unit A is connected continuously at a distance of 10 times the vertical length of the triangular submerged dike unit A to construct a second row of submerged dike. It is sectional drawing which constructed | assembled the submerged dike which consists of the triangular submerged dike unit A at a distance of 10 times the height of the triangular submerged dike unit A, and installed the submerged dike of 3 rows on one side similarly.

FIG. 9 is a cross-sectional view showing a case where a submerged dike is constructed using a plate-like submerged dike unit B instead of the triangular submerged dike unit A in FIG.

When constructing a submerged dike using each submerged dike unit of the present invention, adjacent submerged dike units may be connected to each other or may be installed with a gap between each submerged dike unit. By providing the gaps between the submerged dam units as described above, the floating mud is separated and settled and stored when the tidal current passes through the gaps, so that the prevention of accumulation on the channel can be further enhanced.

DESCRIPTION OF SYMBOLS 1 ... Route 2 ... Reverse T type concrete block 3 ... Anchor 4 ... Rubber board 5 with raw cloth ... Float 6 ... Triangular prism form 7 ...・ Body 8 ...... Wire mesh ...... Plate-like body

Claims (1)

At the lower end of a rubber plate or wooden plate provided with a float at the top, a wire net is attached to the trunk of the submerged dam unit and / or triangular prism mold frame provided with an anchor, and a plate-like body from the top of the triangular prism mold frame Alternatively, a submerged dike revetment method for a channel, wherein a submerged dike unit is constructed by using a triangular submerged unit suspended from a sheet film body and arranging the submerged dike unit in the longitudinal direction on the shoulders on both sides of the channel.

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