JPH0464610A - Wave dissipation structure body - Google Patents

Abstract

PURPOSE:To realize the light weight of a wave dissipation structure body, by providing respectively the front wall and the rear wall with a distance to each other in a direction which crosses a wave spread direction, and equipping a singular or plural wave dissipation pipe bodies between the walls, and making the wave dissipation structure consisting only of the above. CONSTITUTION:The front and rear walls 8,9 made of concrete are provided facing a wave spread direction, and a singular or plural wave dissipation pipe bodies 10 are spanned between these walls. Next, a cross section mountain shape annular squeeze portion 13 and a wave dissipation conducting narrowed passage portion 14 are formed at the front wall 8 by cutting off the tip portion 10 of a pipe body 10. Next, step portions 17 are formed at the front and rear walls 8,9, and the shifting of the upper part lid or the lower part caisson in a forward and backward direction is prevented. As a result, a wave dissipation structure body which is of a light weight structure and capable of being operated easily by means of a crane or pontoon, can be realized, and a dike body of a free length can be structured by placing sideways a plurality of these wave dissipation caissons.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a wave-dissipating structure for absorbing waves.

2. Description of the Related Art Conventionally, wave-dissipating structures have been proposed, for example, in Japanese Patent Application No. 62-217.
There are some known examples such as No. 273.

This conventional wave-dissipating structure has a structure including an embankment body made of a concrete block body and a wave-dissipating hole formed inside the embankment body. The wave-dissipating hole is composed of a cast iron pipe, and when waves pass through the inside, the waves are dissipated by the action of the narrow passage provided inside the wave-dissipating hole.

Problems to be Solved by the Invention However, in such conventional wave-dissipating structures, since the embankment body is formed of concrete blocks, there is a drawback that the weight thereof is excessive. For this reason, if the ground at the bottom of the water where the wave-dissipating structure is installed is soft, there is a risk that the ground will sink. In addition, if the wave-dissipating structure is typically suspended by a barge or crane and lowered into the water, and if its weight is large, the problem arises that it exceeds the capacity limits of these barges or cranes.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a wave-dissipating structure that is lightweight and can be easily operated using a barge, a crane, or the like.

Means for Solving the Problems In order to achieve the above object, the present invention provides a front wall and a rear wall that are respectively arranged in a direction intersecting the wave propagation direction and are provided at a distance from each other; The structure includes one or more wave-dissipating tubes extending between the wave-dissipating tube and the rear wall.

Effect: According to this configuration, at least the wave-dissipating structure is constructed by only the front wall, the rear wall, and the wave-dissipating tube, so a space is formed around the wave-dissipating tube. Therefore, this wave-dissipating structure has a lightweight structure. Therefore, even when used on soft ground, there will be no ground subsidence, and the lifting work using barges or cranes will be easier. In addition,
If necessary, a side wall can also be provided between the front wall and the rear wall.

Embodiment In FIGS. 1 and 2, 1 is a lower caisson made of concrete, which is installed on the bottom of a lake or the like.

This lower caisson 1 is formed into a rectangular box shape, and is provided with an internal space 2 that penetrates in the wave propagation direction. 3 and 4 are openings formed in the front and rear walls. The lower caisson 1 has openings 5 and 6 formed in its both side walls and also in its upper wall.

An upper caisson 7 as a wave-dissipating structure is placed on the lower caisson 1. As shown in FIGS. 3 and 4, this upper caisson 7 has a front wall 8 and a rear wall 9 made of concrete, which are provided at a distance in the direction of wave propagation, and both walls 8.9. It has one or more wave-dissipating tubes 10 interposed therebetween. In addition, if necessary,
A side wall may be provided between the front wall 8 and the rear wall 9.

The wave-dissipating pipe body 10 is made of ductile cast iron, and has a socket 11 at one end and a socket 12 at the other end. The socket 11 is embedded in the front wall 8 and supported by the front wall 8, and the socket 12 is embedded in the rear wall 9 and supported by the rear wall 9. . Either the socket 12 reaches the surface of the rear wall 9, or the socket 11 is arranged so that its tip is cut off and embedded at a distance from the surface of the front wall 8. An annular concrete constriction part 13 with a chevron-shaped cross section is provided on the inner periphery of the wave-dissipating tube 10 in the front wall 8, and this constriction part 13 forms a narrow passage part 14 for dissipating waves. ing.

An upper lid 15 is further placed on the upper caisson 7. The upper lid 15 is made of concrete, and a recess 16 as shown in FIG. 2 can be formed in the upper part. This recessed portion 16 can be used for planting by filling it with earth and sand.

Front wall of upper caisson 7 8. A stepped portion 17 is formed on the rear wall 9, and this stepped portion 17 engages with the lower caisson l and the upper lid 15 to prevent each portion from shifting in the front-rear direction, that is, in the wave propagation direction. Note that a stepped portion may be formed to prevent displacement in the left-right direction.

As shown in FIG. 1, by arranging a plurality of such wave-dissipating caissons in the horizontal direction, an embankment body of any length can be constructed. The side ends of this embankment body may be left open as shown, or may be closed off with a suitable member.

In Fig. 1, 18 indicates the water surface, or below the water surface 18 is an internal space 2 that penetrates the wave-dissipating caisson back and forth.
Since the wave-dissipating pipe body 10 is also present, excellent water permeability can be obtained. Since the wave-dissipating tube 10 is present above the water surface 18, it can be expected that the wave-dissipating tube 10 will have a wave-dissipating effect, a water permeation effect, an aeration effect, and the like.

A large internal space 2 is formed in the lower caisson 1 with openings 3.4.5.6, and a wave-dissipating tube 10 is passed between the front wall 8 and the rear wall 9 of the upper caisson 7. Since the weight of the caisson is small, the weight of the entire caisson can be reduced. Therefore, the caisson can be stably installed even on soft ground without fear of subsidence. In addition, since the caissons 1 and 7 are divided into lower and upper caissons 1.7, each caisson 1, 7 itself is lightweight, and can be easily suspended without exceeding the capacity limits of barges or cranes.

Since the structure is such that waves are transmitted through the wave-dissipating tube 10, the reflectance of waves on the front wall 8 and the rear wall 9 is reduced. Moreover, since it has a transparent structure, it has the effect of reducing wave force, and the stability of the installed state can be improved despite the weight reduction.

In addition, in the above, the upper caisson 7 as a wave-dissipating structure is placed on the lower caisson 1 to construct a wave-dissipating caisson, but the method of using the upper caisson 7 is limited to this. Instead, other suitable methods of use may be used, such as constructing a wave-dissipating caisson by stacking a plurality of upper caisson pieces one above the other.

Effects of the Invention As described above, according to the present invention, at least the wave-dissipating structure can be constructed with only the front wall, the rear wall, and the wave-dissipating tube, so that the wave-dissipating structure has a lightweight structure. Therefore, even when used on soft ground, there will be no ground subsidence, and the work can be easily carried out using barges or cranes.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a wave-dissipating caisson using a wave-dissipating structure according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the wave-dissipating caisson shown in Fig. 1, and Fig. 3 is the same wave-dissipating structure. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2. l... Lower caisson, 2... Internal space, 7... Upper caisson (wave dissipating structure), 8... Front wall, 9... Rear wall, 10... Wave dissipating tube . Agent: Yoshihiro Morimoto

Claims (1)

[Claims] 1. A front wall and a rear wall that are arranged in a direction that intersects the wave propagation direction and are spaced apart from each other, and one or more wave dissipating units that are passed between the front wall and the rear wall. A wave-dissipating structure characterized by having a pipe body.