JP3016675U - Breakwater superstructure - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a slim and low-cost breakwater without increasing the scale of the breakwater by making the front surface of the superstructure an inclined surface and shifting the center of gravity of the superstructure to the front side as much as possible. Provide superstructure. [Structure] In the superstructure 1 arranged on the upper part of the main body 2 of the breakwater, the upper work surface on the front side of the breakwater is composed of an inclined surface 4 inclined rearward and upward, and the upper part on the rear side of the breakwater. A superstructure of a breakwater in which a recessed surface 7 cut toward the front side is formed on the work surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a superstructure placed above the main body of a breakwater.

[0002]

[Prior art]

 In this type of breakwater, generally, as shown in FIG. 4, a caisson 22 that constitutes the main body of the dike is installed on a foundation rubble 21 laid on the seabed, and an approximately rectangular cast-in-place concrete is installed above the caisson 22. -The superstructure 23 is installed.

[0003]

[Problems to be solved by the device]

 By the way, the breakwater becomes heavier as the water depth increases. Also, the higher the wave height, the greater the wave force. Therefore, the greater the depth of the water and the height of the wave, the greater the external force acting on the breakwater and the greater the ground reaction force. On the other hand, the ground bearing capacity of the foundation is determined by its properties, such as unit volume weight, internal friction angle, adhesive strength, etc., regardless of the depth of water and the height of wave height. Generally, the stability of a breakwater is checked by a safety factor for three factors: overturning force, horizontal force, and ground reaction force. The greater the depth of water and the height of a large wave, the greater the safety factor against ground reaction force becomes. It is something that becomes. Therefore, if a breakwater is designed so that the ground reaction force is as small as possible, the breakwater can be made slim and economically low cost as a result. However, in the breakwater in the above-mentioned prior art, since a rectangular one is usually used as the superstructure 23, the wave pressure acts horizontally on the wall surface 24 of the superstructure 23 which is the upright surface of the front face, and Pressure will act on the bottom surface 25 of the caisson 22. In this case, the center of gravity of the superstructure 23 is located substantially at the center of the superstructure 23 in the width direction. Therefore, the ground reaction force at the breakwater becomes large, and it is necessary to make the width of the superstructure 23 and the caisson 22 of the breakwater large, and there is a problem that the breakwater must be constructed on a large scale. .

The present invention has been made in view of the above problems of the conventional technique, and its purpose is to make the front surface of the superstructure an inclined surface and to position the center of gravity of the superstructure. By moving the breakwater to the front side as much as possible, it is intended to provide a superstructure to obtain a breakwater that is slim and inexpensive without increasing the size of the breakwater.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the superstructure structure of the breakwater in this invention is composed of an inclined surface in which the upper surface on the front side of the bank is inclined rearward and upward, and the upper surface on the rear side of the bank is It is characterized in that a recessed surface that is cut toward the front side is formed.

The inclined surface may be a curved surface.

A sidewalk may be formed near the top of the superstructure.

[0008] Furthermore, ridge walls may be provided at intervals on the upper work surface on the rear surface side of the bank.

[0009]

[Action]

 Since the upper work surface on the front side of the bank is composed of an inclined surface that is inclined rearward and upward, the component force of wave pressure acting on the inclined surface is smaller in the horizontal direction than in the case where the conventional front surface is vertical. It acts as a vertical force that pushes the force and the superstructure and levee body downwards, increasing the frictional resistance, which is the horizontal resistance of the terminal and breakwater. In addition, since the concave surface cut toward the front side is formed on the upper work surface on the rear side of the bank, the center of gravity of the superstructure can be moved to the front side and the weight can be reduced, so that It is possible to reduce the ground reaction force on the breakwater when an external force is applied, in other words, when the same external force is applied, the width of the superstructure and the main body of the breakwater can be made narrower than the conventional one. Therefore, it is possible to save the material by forming the recess and reduce the weight of the upper work.

Even if the slanted surface is formed of a curved surface, substantially the same action can be expected, and the amount of overtopping can be reduced by the wave return effect, and a sidewalk is formed near the top of the superstructure. If you do this, you can walk freely on the breakwater, and if you want to place a ridge wall on the upper surface of the rear side of the ridge at a certain distance, you should use the upper wall with a recess. It is possible to reinforce by using this, and the cut amount of the superstructure can be increased accordingly, and the total weight of the superstructure can be further reduced.

[0011]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which reference numeral 1 is a superstructure placed on an upper part of a bank main body 2, and the superstructure 1 is a concrete body for a concrete wall. It is formed by casting into No. 2. The bank main body 2 is arranged above the foundation rubble 3 and the like.

An upper work surface on the front side of the bank main body 2 is composed of an inclined surface 4 which is inclined rearward and upward, and a sidewalk 6 is formed in the vicinity of the top end 5 of the bank main body 2. On the upper work surface, a concave surface 7 is formed which is cut toward the front side. The front side of the bank main body 2 usually means the offshore side 8 of the sea, and the rear side of the bank main body 2 usually means the coastal side 9.

Therefore, the wave pressure acting on the inclined surface 4 of the superstructure 1 on the front side of the bank main body 2 in the direction perpendicular to the inclined surface 4 causes the horizontal component force that pushes the superstructure 1 in the horizontal direction and the superstructure 1 and the bank main body 2. It becomes a vertical component force in the vertical direction that pushes against the foundation rubble 3 side, and this vertical component force is transmitted to the levee body 2 through the superstructure 1 and increases the frictional resistance force, which is the horizontal resistance force of the breakwater. Further, since the concave surface 7 cut toward the front side is formed on the upper side of the rear side of the bank, the center of gravity of the upper side 1 can be brought closer to the front side and the ground reaction force can be reduced. In addition, it is possible to save the material and reduce the weight of the superstructure by forming the recess. The superstructure 1 and the bank main body 2 can be made slimmer than the conventional example due to the increase of the frictional resistance force and the decrease of the ground reaction force.

FIG. 2 shows another embodiment, which is substantially the same as the first embodiment except that the inclined surface 10 formed on the superstructure 1 is formed into a curved surface. Since they are the same, the same reference numerals are given and the description thereof is omitted. In this case, the amount of waves overwhelmed by the inclined surface 10 can be reduced as compared with the first embodiment due to the wave returning effect of the curved surface of the inclined surface 10.

Further, as shown in the first and second embodiments, when the sidewalk 6 is formed on the rear side of the superstructure 1 near the top 5, it is possible to freely and safely walk on the breakwater. Become.

FIG. 3 shows still another embodiment, which is different from the first embodiment except that a ridge wall 11 is provided at an interval in the concave surface 7 on the rear surface side of the superstructure 1. Since the other configurations are substantially the same, the same reference numerals are given and the description thereof is omitted. In this case, the upper work 1 having the concave surface 7 can be reinforced by the ridge wall 11, and accordingly, the amount of cutting of the upper work 1 can be further increased, and the weight of the entire upper work 1 can be further increased. The weight can be reduced. In this embodiment, the inclined surface may be formed in a curved shape as in the second embodiment, or the top end itself may be used as a sidewalk, or the top end 5 may be formed as in the other embodiments. A sidewalk 6 may be formed in the vicinity on the rear surface side of the superstructure 1.

Although a plurality of embodiments have been described in detail above, in any of the embodiments, the concave surface 7 is formed deep as long as the strength of the inclined surface 4 or 10 is within the allowable range, and the center of gravity of the superstructure 1 is increased. It is advisable to move the to the front side and save the material. Further, it is more significant to combine the caisson which constitutes the bank main body 2 as an inclined caisson with the superstructure 1 according to the present invention.

[0018]

[Effect of device]

 According to this invention, the upper work surface on the front side of the embankment is composed of an inclined surface that is inclined rearward and upward, and the recessed surface cut toward the front side is formed on the upper work surface on the rear side of the embankment. The frictional resistance of the breakwater can be increased and the ground reaction force can be reduced. Consequently, the whole breakwater can be slimmed down, and the upper part of the breakwater will be a low-cost breakwater.

According to the second aspect of the invention, since the inclined surface formed on the superstructure is formed as a curved surface, a safe breakwater superstructure structure with a relatively small amount of overtopping is provided.

Further, in the invention of claim 3, since the sidewalk is formed in the vicinity of the top end of the superstructure, the superstructure of the breakwater can freely walk on the breakwater safely.

Further, in the invention of claim 4, since the ridge walls are provided at intervals on the upper work surface on the rear surface side of the levee, a lighter weight and stronger superstructure structure for the breakwater is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a breakwater using the superstructure structure of the breakwater according to the present invention.

FIG. 2 is a sectional view of a superstructure of a breakwater according to another embodiment of the present invention.

FIG. 3 is a sectional view of a superstructure of a breakwater according to still another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional breakwater.

[Explanation of symbols]

 1 Superstructure 2 Levee main body 4, 10 Inclined surface 5 Top edge 6 Sidewalk 7 Recessed surface 11 Wall

Claims (4)

[Scope of utility model registration request] 1. A superstructure to be arranged on an upper part of a main body of a breakwater, wherein a front side of the front side of the breakwater is an inclined surface that is inclined rearward and upward, and a superstructure on the rear side of the breakwater. A superstructure structure for a breakwater, characterized in that a recessed surface cut toward the front side is formed in the above. 2. The superstructure structure for a breakwater according to claim 1, wherein the inclined surface is formed by a curved surface. 3. The breakwater superstructure structure according to claim 1 or 2, wherein a sidewalk is formed near the top of the superstructure. 4. The ridge wall is provided on the upper work surface on the rear surface side of the bank at intervals.
Alternatively, the superstructure structure of the breakwater according to claim 3.