JP2660677B2 - Apparatus for preventing the generation of shock wave force in waterside structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing the generation of a shock wave force caused by the compression of air stagnated in a structure built near water, such as a jetty or a curtain wall type breakwater.

[0002]

2. Description of the Related Art Generally, in the case of a waterfront structure such as a jetty or a curtain wall type breakwater, a wave surface and a lower surface of an upper floor plate and a rear wall (a front wall of a construction work) of a wave structure are hit when a wave comes. It is known that the air trapped in the space surrounded by) is gradually compressed, and depending on the conditions, it becomes a shocking wave force, which adversely affects the connection part of the structure and the support force of the support pile etc. .

[0003] Under such circumstances, in this type of conventional waterside structure, a through hole is formed at an appropriate place of the upper floor plate, and the through hole is subjected to a grating for preventing the hole from falling. The air trapped in the space surrounded by is devised such as dissipating to the outside through this through hole, but when a large wave hits, not only air but also seawater gushes from this through hole In addition to obstructing the passage of people and vehicles, it is difficult to open a hole in the upper floor panel of the existing waterside structure, and it has been said that such a shock wave force is inevitable.

[0004]

Therefore, in the present invention, one or more tubular bodies whose one ends are closed are disposed on the lower surface of the upper floor plate of the waterside structure, and one or more tubular bodies are arranged along the lower surface of the tubular body. The other end side is communicated with the atmosphere at the side or above the upper floor plate, and the air confined in the space surrounded by the wavefront, the lower surface of the upper floor plate, and the rear wall is opened through the tubular body. It is intended to prevent the generation of a shock wave force by successively radiating to the outside.

In this case, the tubular members disposed on the lower surface of the upper floor plate are disposed at predetermined intervals along the traveling direction of the waves, or at predetermined intervals along the direction perpendicular to the traveling direction of the waves. It is preferable to employ a configuration in which a plurality of pipe pipes are provided, and the other ends of these pipe pipes are connected to a communication pipe so that the communication pipe communicates with the atmosphere. In addition, when newly constructing a waterside structure, the tubular body can be buried in the upper floor plate.

[0006]

According to the shock wave force generation preventing device of the present invention,
The air confined in the space surrounded by the wavefront, the lower surface of the upper floor plate, and the rear wall is not compressed because it is sequentially radiated to the outside through the tubular body due to the pressure change due to the vertical movement of the wavefront.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, as a preferred embodiment of a device for preventing the generation of a shock wave in a shore structure according to the present invention, a device for preventing the generation of a shock wave in a pier structure will be described with reference to the accompanying drawings. Will be described. The present invention is not limited to this embodiment. For example, the present invention can be suitably applied to a curtain wall type breakwater, and various design changes are made without departing from the spirit of the present invention. Obviously you can get it.

1 to 3, reference numeral 10 denotes a pier structure. The pier structure 10 is provided with an upper floor plate 14 forming a pier main body in front of a revetment 12 as a staying work. The floorboard 14 is supported by, for example, a support pile 16 made of steel pipe. A front hanging portion 18 extending vertically downward is formed on the front surface of the upper floor plate 14.

The pier structure 10 thus configured is provided with a shock wave generation preventing device 20. That is, this prevention device 20 has a plurality of pipe pipes 22 arranged at predetermined intervals along the traveling direction of the wave on the lower surface of the upper floor plate 14, and closes the tip portions 22a of these pipe pipes 22. Through holes 24 are opened at predetermined intervals on the lower surface thereof, and the other end 22b side of each pipe pipe 22 is connected to a communication pipe 26 arranged inside the anteverting portion 18 in a direction orthogonal to the wave traveling direction. The upper end of the communication pipe 26 is connected to the atmosphere at the side opening of the upper floor plate 14. In this case, the diameter of the pipe 22, the size of the through hole 24, and the opening interval are appropriately set according to the installation conditions of the shore structure.

Further, as shown in FIG. 4, pipe pipes 22 provided on the lower surface of the upper floor plate 14 are provided at predetermined intervals in a direction orthogonal to the traveling direction of the waves.
2 is connected to the communication pipe 26 at the side of the upper floor plate 14 and the end opening 2 of the communication pipe 26 is connected.
8 may be configured to communicate with the atmosphere. In this case, when the length of the pier structure 10 in the direction orthogonal to the wave traveling direction becomes equal to or greater than a predetermined length, the communication pipe 2 may be appropriately connected.
6 is preferably provided.

In the pier structure 10 having the shock wave force generation preventing device 20 according to the present invention configured as described above, the pier structure is confined in the space A surrounded by the wave surface, the lower surface of the upper floor plate 14, and the rear wall (the front wall of the revetment 12). The generated air flows into the pipe tube 22 from the through hole 24 due to a pressure change due to the vertical movement of the wavefront, and the end opening 28 of the communication tube 26 connected to the pipe tube 22.
From the outside. Therefore, the pressure of the air in the space A does not increase, and the generation of a shocking wave force can be reliably prevented (see FIG. 2).

FIG. 5 shows a state in which a pipe 22 is buried when the upper floor plate 14 is formed.
The pier structure 10 has a through hole 24 in the lower surface of the second pier 2 (the lower surface of the upper floor plate 14). However, in this case, it is needless to say that the same effect as described above can be obtained.

FIGS. 6 and 7 show the results of wave force measurements performed by hydraulic experiments to compare a pier structure provided with the shock wave force generation preventing device according to the present invention with a normal pier structure. (Note that in FIG. 6, a positive value of the horizontal wave force indicates a shoreward wave force acting on the rear wall, and a negative value similarly indicates an offshore wave force.)

According to the measurement results, when the incident wave height increases and air is confined in the space A surrounded by the wave front, the lower surface of the upper floor plate, and the rear wall, the shock wave force generation preventing device according to the present invention is provided. The value of the horizontal wave force acting on the rear wall of the pier structure provided with is reduced to about 60 to 75% of the horizontal wave force acting on the normal pier structure (see FIG. 6),
Also, the value of the vertical wave force (lift pressure) is reduced to about 70 to 80% of the vertical wave force acting on a normal pier structure (see FIG. 7). The reduction of the wave force in this way means that even if the air is confined in the space A, the air is radiated sequentially without being compressed and the generation of the shock wave force can be prevented. Is shown. In the measurement results, it was also confirmed that the reduction rate of the wave power increases as the period of the incident wave increases.

[0015]

As described above, according to the apparatus for preventing the generation of a shock wave force according to the present invention, the air staying in the space surrounded by the wave surface, the lower surface of the upper floor plate, and the rear wall is subjected to the pressure change due to the vertical movement of the wave surface. Because it is sequentially radiated to the outside through the tubular body,
It is possible to prevent the generation of a shocking wave force caused by the stagnated air, and therefore it is possible to improve the durability of the waterside structure.

Further, the elimination of such shocking wave force acting on the shore structure (reduction of wave force) can be achieved by reducing the depth of the support pile,
It is possible to reduce the pile diameter and the thickness of the upper floor plate, etc.
Since it is possible to prevent damage to the wooden formwork usually used when forming the upper floor plate (superstructure), it has various advantages such as easy construction of this type of shore structure.

[Brief description of the drawings]

FIG. 1 is an explanatory side view of a pier structure as a shore structure provided with a shock wave force generation prevention device according to the present invention.

FIG. 2 is an explanatory view of a state in which air trapped in a space A surrounded by an upper floor plate, a rear wall, and a wave surface of the pier structure shown in FIG.

FIG. 3 is a partially cutaway perspective view of the pier structure shown in FIG. 1;

4 is a partially cutaway perspective view corresponding to FIG. 3 of another pier structure as a shore structure provided with the shock wave force generation preventing device according to the present invention.

FIG. 5 is an explanatory view of a new pier structure provided with the shock wave force generation preventing device according to the present invention.

FIG. 6 is a table showing measurement results of horizontal wave force acting on a rear wall of a pier structure provided with the shock wave force generation preventing device according to the present invention and a normal pier structure.

FIG. 7 is a table showing measurement results of vertical wave force (lift pressure) acting on a pier structure provided with the shock wave force generation prevention device according to the present invention and a normal pier structure.

[Explanation of symbols]

10 pier structure, 12 revetment (abutment work), 14
Upper floor board, 16 support piles, 18 anteversion, 2
0 Shock wave force generation prevention device, 22 Pipe tube, 24
Through-hole, 26 communication pipe, 28 end opening,

Claims (4)

(57) [Claims] 1. A tubular body having one end closed at a lower surface of an upper floor plate of a waterfront structure, one or more through holes are opened along the lower surface of the tubular body, and the other end is provided. A device for preventing the generation of shock wave force in a waterside structure, characterized in that a side thereof communicates with the atmosphere on the side or above the upper floor plate. 2. A tubular body disposed on a lower surface of an upper floor plate is composed of pipe pipes having a predetermined diameter arranged at predetermined intervals along a traveling direction of a wave, and communicates with the other end sides of these pipe pipes. 2. The method according to claim 1, further comprising the step of connecting to a pipe to communicate the communication pipe with the atmosphere.
The shock wave generation prevention device for a waterside structure according to claim 1. 3. The tubular body disposed on the lower surface of the upper floor plate is composed of pipe pipes of a predetermined diameter disposed at a predetermined interval along a direction perpendicular to the traveling direction of the wave, and the other ends of these pipe pipes. The device for preventing the generation of a shock wave force in a waterside structure according to claim 1, comprising connecting the communication side to the communication pipe at the side of the section and connecting the communication pipe to the atmosphere on the side of the upper floor plate. 4. The apparatus for preventing generation of shock wave force in a shore structure according to claim 1, wherein the tubular body is buried in an upper floor plate.