JP2000144674A - Built-up wave-suppressing caisson and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a built-up wave-suppressing caisson and its construction method allowing execution with a small crane ship or an FD. SOLUTION: This wave-suppressing caisson 10 has a blank structure on the other face except for opening sections 19 formed at a prescribed pitch on the front face. The caisson 10 is provided with multiple horizontal plates 15 arranged in the lateral direction in partitioned stages, front plate sections 20, 29 having the opening sections 19 on the adjacent horizontal plates 15, rear plate sections 21, 27 forming the blank structure on the back face, a pair of diagonal plate sections 22, 28 connecting the front plate sections 20, 29 and the rear plate sections 21, 27 and having an X-shape on the plan view, and a wave-suppressing structural bodies 18 stacked in the fixed state in the vertical direction via the horizontal plates 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prefabricated wave-breaking caisson (including a low-reflection quay, a revetment, a breakwater, etc.) mainly used in the ocean and a method of constructing the same.

[0002]

2. Description of the Related Art Conventionally, caissons having a wave-dissipating structure have been used at seaports in Japan for revetment and the like. There are cross-hollow caisson (Toa Civil Engineering), honeywall caisson (Sanshui Water Works), slit caisson (developed by Port and Harbor Research Institute of Ministry of Transport), etc. Perforated caissons are also used. In recent years, the caisson with these wave-dissipating structures has been increasing in size, and in the aforementioned cross-hollow caisson,
Its maximum weight was about 1152 t. When manufacturing a caisson having such a wave breaking structure, the caisson was manufactured in a land yard where a hoist ship can berth, and then transported to the site by the hoist ship and installed. On the other hand, a normal caisson having a cavity inside has been manufactured on a caisson working platform (floating dock, hereinafter referred to as FD).
A normal caisson built on top of the FD was able to float by injecting seawater into the bottom hold of the FD and once submerging the hull of the FD. The caisson that had surfaced was lifted by a hoisting ship and towed to the site by a small carrier to be installed.

[0003]

However, the caisson having the conventional wave-absorbing structure has the following problems. (1) When using a hoist ship, for example, 1000t
When a caisson having a class wave-breaking structure is manufactured, a hoist ship of about 2000t class is required in consideration of the safety factor of the lifting capacity. However, at present, the number of hoist ships having a lifting capacity of 2000t class is very small.
For this reason, in order to select the most suitable hoisting vessel for the weight of the caisson, the construction had to be carried out based on the ship owner's dispatch plan, which required a long construction period and a large cost. (2) The wave-dissipating caisson has a water-passing part inside due to its structure of dispersing waves and absorbing energy. For this reason, the inside of the caisson has a hollow structure like a normal caisson, and it cannot be floated on the sea and towed, so that it cannot be manufactured on the FD.

As described above, there are many problems when manufacturing a caisson having a wave breaking structure. In recent years, the size of ships has been increasing and the scale of ports has been expanded, and the caisson used has been enlarged accordingly.
A 5000t class caisson is being planned and implemented. Since a caisson having a wave-dissipating structure corresponding to this is required to be of the same scale, it was urgently necessary to solve the above problems. The present invention has been made in view of such circumstances,
An object of the present invention is to provide an assembling-type wave-breaking caisson that can be constructed using a small hoist ship or FD and a method of constructing the same.

[0005]

According to the present invention, there is provided an assembled wave-damping caisson according to the present invention, wherein the other surface has a blind structure except for openings formed at a predetermined pitch on the front surface. And partitioning each step, a plurality of horizontal plates arranged side by side in a horizontal direction, and a front plate portion provided with the opening on the adjacent horizontal plate, after forming a rear blind structure. X in plan view connecting the plate portion and the front plate portion and the rear plate portion.
And a wave-breaking structure that is stacked in a vertically fixed manner via the horizontal plate. Here, the predetermined pitch is a pitch of horizontal plates arranged side by side. The blind structure means a closed structure.Specifically, it refers to a structure that is waterproof enough to prevent water leakage while transporting the completed assembled wave-breaking caisson floating on water. is there. In the present invention, since the portion other than the opening has a blind structure,
The opening can be sealed and floated on water. In addition, the vertical movement of the wave can be suppressed by the horizontal plate, and the traveling direction of the wave can be changed in the horizontal direction by the wave-dissipating structure.

[0006] First to fourth connecting holes are formed in the front side of the front plate portion and immediately before the both sides of the rear plate portion. The fifth to eighth connection holes communicating with the first to fourth connection holes are formed.
It is also possible to insert a reinforcing steel bar or a shaped steel into the eighth connection hole, flow concrete, and fix the horizontal plate and the wave-dissipating structure. The horizontal plate and the wave-absorbing structure can be firmly fixed inside the assembly type wave-absorbing caisson by the connection holes penetrating vertically. Further, in the wave-absorbing structure, the front plate portion and the rear plate portion are divided into two in the front-rear direction with the opening as a center, and the front plate portion and the rear plate portion that are divided into two portions are the same. By a split wave-breaking structure of essentially the same structure, which is connected in the oblique direction by the slanted plate portion having a height half that of the wave-breaking structure and deflected in any of the upper and lower directions. It can also be configured. Since the split wave-dissipating structure obtained by dividing the wave-dissipating structure is used, the structure is simplified, and the manufacture and handling of the members can be facilitated.

Here, a vertical plate portion is provided at the center position of the horizontal plate between the adjacent diagonal plate portions in an assembled state, and vertically penetrates behind the vertical plate portion. A wavy hole may be formed. Waves can be made to collide with the vertical plate portion to promote branching and merging of the waves. The method of constructing a prefabricated type wave-dissipating caisson according to the present invention is a method of constructing a wave-dissipating caisson having a space inside at the time of manufacture except for a blind structure except for openings formed at a predetermined pitch on the front surface. The construction method, wherein the wave-dissipating caisson comprises a combination of individual block structures including a plurality of horizontal plates and a wave-dissipating structure, and the block structure necessary for forming the wave-dissipating caisson is provided. Pre-manufacturing at a predetermined location, and transporting the manufactured block structure to a caisson working boat at sea, assembling the wave-breaking caisson thereon, and opening the wave-breaking caisson. Providing a blind plate for preventing seawater from entering from the section; and placing the seawater into the space inside the caisson workbench, submerging the caisson workbench into water, Type caisson at sea And a step of floated and towed to the extinguishing corrugated caisson floating on the sea to a predetermined location, a step of pouring water into the interior of digestion wave caissons, placed on the seabed of the predetermined location. Since the wave-breaking caisson is assembled on the sea, it is possible to avoid congestion at the production site on land, and since it is floated on the water and towed, it can be transported by a small hoist ship or a work boat.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

As shown in FIG. 1, an assembled wave-breaking caisson 10 according to an embodiment of the present invention has a bottom plate 11 at a lower portion and side plates 1 at left and right sides, respectively, in order to form a blind structure except at the front.
2, a ceiling plate 13 at the top, and a caisson 14 with a hollow inside at the back. And the opening 1 on the front
9 are formed at a predetermined pitch in the horizontal direction. On the bottom plate 11, there are provided a plurality of horizontal plates 15 arranged side by side to partition each stage, and a plurality of wave-dissipating structures 18 stacked in a vertically fixed state via the horizontal plates 15. . The wave-absorbing structure 18 is provided on the first horizontal plate 15 on the adjacent horizontal plate 15.
, And a second divided wave-eliminating structure 17. The horizontal plate 15 and the wave-dissipating structure 18 are made of concrete, and can have a reinforcing bar or a steel frame therein.
The strength can be increased by inserting a reinforcing bar, and the strength can be further increased by inserting a steel frame. Hereinafter, the internal structure will be described in detail.

First, each member constituting the interior of the assembled wave-breaking caisson 10 will be described. As shown in FIGS. 2A and 3, the first split wave-breaking structure 16 includes a front plate portion 20 located in front of the assembled wave-breaking caisson 10 and a rear plate portion provided in parallel with the front plate portion 20. 21 and an oblique plate portion 22 for connecting the front plate portion 20 and the rear plate portion 21. Front plate 2
0 and the height of the rear plate portion 21 are the same, and the height of the diagonal plate portion 22 is formed to be half of the height of the front plate portion 20 so as to be deviated upward, but to be deviated downward. You may. Front plate 2
0, immediately before the rear plate portion 21 and on the inner angle side of the portion connected to the diagonal plate portion 22, respectively, first and vertically penetrated by connecting ribs 25, 26 provided in a staggered manner. Second connection holes 23 and 24 are formed. Since the connecting ribs 25 and 26 are provided in a strut shape, the front plate 20
In addition, the strength of the portion where the rear plate 21 is connected to the oblique plate can be increased.

A recess is provided at an upper portion of a corner where the front plate portion 20 and the rear plate portion 21 of the first split wave-absorbing structure 16 are connected to the oblique plate portion 22, and is transported into each recess. Lifting fittings 38 and 39 that are sometimes used are provided. The wave breaking structure 18 manufactured in the land yard is lifted by a hoist ship or a crane provided in a harbor. At this time, the lifting brackets 38, 3
Since 9 is provided in the concave portion, it can be easily transported. When the lifting brackets 38 and 39 are provided in the first split wave-absorbing structure 16, it is preferable to provide them simultaneously when a reinforcing bar or a steel frame is inserted therein.

The second divided wave-eliminating structure 17 is a member having substantially the same structure as the first divided wave-eliminating structure 16, and includes a front plate 29, a rear plate 27, an oblique plate 28, Third and fourth connection holes 30 and 31, lifting hardware 40 and 41, and connection ribs 25a and 26a are provided. In addition, essentially the same means that the parts other than the mounting position of the lifting hardware have the same shape. The mounting positions of the lifting brackets 40 and 41 are provided at positions corresponding to the lifting brackets 38 and 39 of the adjacent first split wave-breaking structure 16 during assembly. The respective ends of the rear plate 21 of the first split wave-breaking structure 16 and the rear plate 27 of the second split wave-breaking structure 17 are joined, and the pair of oblique plate portions 22 and 28 cross each other. The wave-breaking structure 18 is manufactured by forming an X-shape in plan view. At the front of the wave-absorbing structure 18, the first and second split wave-absorbing structures 16,
An opening 19 is formed between the front plate portions 20 and 29 of 17.
The rear plate portions 21 and 27 joined at the rear portion form a blind structure on the back surface, and the diagonal plate portions 22 and 28 are paired diagonal plate portions 18a.
To form It should be noted that the first and second split wave-eliminating structures 16,
17 may be a wave-dissipating structure integrally manufactured from the beginning. With the integral structure, the number of parts can be reduced, and the assembling time can be shortened.

As shown in FIGS. 2B and 3, the horizontal plate 1
5, a vertical plate portion 32 is provided upright between the adjacent diagonal plate members in an assembled state, and a wavy hole 33 penetrating vertically is formed behind the vertical plate portion 32. I have. The first to fourth connection holes 23, 24, 30, 3 of the wave-absorbing structure 18 placed on the front and rear portions of the horizontal plate 15 are provided.
Fifth to eighth connection holes 34 to 37 communicating with 1 are formed. The first to eighth connection holes 23, 24, 30, 31,
Numerals 34 to 37 are fixed by pouring concrete into a reinforcing bar or a shaped steel.

Next, the connection structure between the horizontal plate 15 and the wave canceling structure 18 will be described. As shown in FIGS. 1 and 3, the horizontal plate 15 is arranged without any gap in the horizontal direction. Between the left side plate 12 and the left end horizontal plate 15, there is provided a flat plate-shaped gap plate 44 having a size obtained by cutting the horizontal plate 15 in half.
The gap plate 49 disposed in contact with the right side plate 12 has the same shape as the gap plate 44. Left gap plate 44
Has the second and third wave-absorbing structures 18 installed thereon.
A connection hole (not shown) is provided at a position corresponding to the connection holes 24 and 30. The right gap plate 49 is also provided with a connection hole. The gap plates 44, 49
It is also possible to form a through hole (not shown) in the vertical direction. Above the horizontal plate 15, a wave-breaking structure 18 is provided in a lateral direction with the pitch of the horizontal plate 15 shifted by half. The lifting hardware 38, 41 on the upper side of the wave-elimination structure 18 on the left side of the adjacent wave-elimination structure 18 and the lifting hardware 40, 39 on the upper side of the wave-elimination structure 18 on the right side are bolts 45.
And the nut 46. The lifting brackets 38 to 41 provided for transportation can also be used as fixing brackets, so that efficiency is high.

The first to fourth connection holes 2 of the wave-absorbing structure 18
Reinforcing bars or section steels are inserted into the fifth to eighth connection holes 34 to 37 of the 3, 24, 30, 31 and the horizontal plate 15, and concrete is filled without gaps. After placing the wave-damping structure 18 on the uppermost stage, the reinforcing steel or the shaped steel is inserted from the first to fourth connection holes 23, 24, 30, 31 of the wave-damping structure 18, and the concrete is Or it was poured after the insertion of the section steel. Since the horizontal direction is fixed by lifting metal fittings 38 to 41 using an iron material strong in tension and the vertical direction is fixed by concrete strong in compression, the assembled wave-breaking caisson 10 can be firmly fixed. In addition, on the side plates 12 on both sides, the lifting brackets 39, 40 are located at positions corresponding to the lifting brackets 49, 40 on the upper side of the wave-absorbing structures 18 at both ends.
Fixing brackets 47 and 48 having the same shape as those described above are provided. Thereby, the wave-absorbing structures 18 at both ends of each stage can be fixed, and the strength of the assembled wave-absorbing caisson 10 can be further increased.

Next, the entire assembling procedure will be described with reference to FIG. First, the bottom plate 11 is installed. The bottom plate is usually a single plate, but may be provided separately. Next, the rear caisson 14 and the side plate 12 are installed. When the caisson 14 uses the prefabricated wave-breaking caisson 10 as a breakwater away from land,
After the installation, crushed stones and the like can be put into it to increase the weight and the installation can be performed stably. However, when used as a quay berthing on land, it can be omitted. And horizontal plate 1
5. The gap plates 44 and 49 are placed on the bottom plate 11, the wave-breaking structure 18 is placed thereon, and the adjacent wave-breaking structures 18 are fastened and fixed with bolts 45 and nuts 46 (see FIG. 3).
The horizontal plate 15, the gap plates 44, 49 and the wave-breaking structure 18 are alternately laminated, and after repeating this up to the uppermost stage, the first to fourth connection holes 23, 24, 30, 31 are provided with reinforcing bars or steel bars. Insert and allow concrete to solidify. The concrete is filled up to the lowermost stage, solidified, and can fix the horizontal plate 15 and the wave-absorbing structure 18 which are vertically stacked one upon another, so that the efficiency is high. In addition, since there is a possibility that water may enter a joint portion other than the opening portion 19 on the front side, a rubber or plastic caulking agent, or a foamed rubber plate or the like is used as a waterproof material to enhance waterproofness. .

The ceiling plate 13 is fixed after other parts of the assembled wave-breaking caisson 10 are mounted on the seabed, but may be fixed before sinking. When fixed after being placed on the seabed, the weight is lighter and easier to tow.When fixed before submerging, it can be towed farther because water does not penetrate even if it receives waves from the top. it can. Note that the lowermost horizontal plate 15 and the gap plates 44 and 49 may be omitted.

Next, in FIG. 4B, the assembled wave-breaking caisson 10 which is a modification of the assembled wave-breaking caisson 10 is shown.
The vertical movement of the wave when a is used will be described. The assembled wave-breaking caisson 10a has the same shape as the assembled wave-breaking caisson 10 except that the caisson 14 on the back of the assembly wave-breaking type caisson 10 is omitted, except for the shapes of the bottom plate, side plates, and ceiling plate. Waves are the vertical movement of the sea surface, and this vertical movement is transmitted in the horizontal direction. An assembling type wave-dissipating caisson 10a, which is installed on the sea floor and has an upper part protruding from the sea surface, suppresses a vertical movement of a wave entering the inside by a plurality of horizontal plates 15. Also, when the wave is at the position shown by the dotted line a in the figure, the wave flows in from the upper stage, and when reaching the upper part of the wave passage hole 33, passes through the wave passage hole 33 if there is a space inside the lower stage. Assembling wave-breaking caisson 10a from bottom
Can flow out of the house. When the wave is at the position shown by the solid line b,
When the wave flows in from the lower stage and reaches the lower part of the wave passage hole 33, if there is no space inside the lower stage, the wave can pass through the wave passage hole 33 and flow out from the upper stage to the outside of the knockdown type caisson 10a. Since the wave moves up and down inside the assembled wave-breaking caisson 10a, the flow of seawater flowing out of the opening 19 can be smoothed, the sound of the wave can be reduced, and a gentle flow can be achieved. When there is no wave passage hole 33, the wave is passed through the opening 19.
If the entire surface is covered, the air will be trapped inside each stage partitioned by the horizontal plate 15 and it will be in a sealed state,
Trapped air can block the penetration of waves. However, in the present invention, since the wave passage hole 33 is provided, when the wave covers the entire surface of the opening 19 and enters, the internal air moves upward through the wave passage hole 33 and hinders the wave from entering. Waves can be reliably eliminated without any problem.

Next, the movement in the horizontal direction (see FIGS. 2A and 3) will be described. The waves coming from the opening 19
Dispersed to the left and right by the oblique plate portions 22 and 28, respectively.
The dispersed wave collides with the vertical plate portion 32, and further, the rear plate portion 2
It collides with 1 and 27 and consumes much energy. As described above, the horizontal plate 15 suppresses the vertical movement of the wave, and the wave-dissipating structure 18 changes the traveling direction of the horizontal wave so that the energy of the wave can be efficiently consumed and the wave can be eliminated. Here, the vertical plate portion 32 provided on the horizontal plate 15 may be omitted. Horizontal plate 1 by omitting
5 can be reduced in weight, processing can be simplified, and assembly can be performed easily.

Next, the installation location and application of the assembled wave-breaking caisson will be described with reference to FIGS. 4 (A) and 4 (B).
In FIG. 4A, the assembled wave-breaking caisson 10 is used.
In (B), the assembled wave-breaking caisson 10a in which the caisson 14 on the back of the assembled wave-breaking caisson 10 is omitted is used. FIG. 4A shows a state in which the assembled wave-breaking caisson 10 is used as a breakwater. Waves can be prevented from penetrating deep into the harbor, reducing reflected waves, and reducing transmitted waves due to waves passing over the breakwater. At this time, the crushed stone 52 can be put inside the caisson 14 to be stabilized. FIG. 4B shows a state in which the assembled wave-breaking caisson 10a is used on a quay facing a place where waves of the open sea 51 directly enter.
The bay 51 can be calm with respect to the open sea 50.
When the water depth is deep, the assembled wave-breaking caissons 10 and 10a can be used in an overlapping manner according to the water depth. In addition, because it is not affected by waves in deep water,
A cellular block or caisson may be provided below the assembly type wave-dissipating caisson 10, 10a. This can save material.

The assembled wave-breaking caisson 10, 10a can also be used as a seawall block. In addition, when the port has a culture facility, the caisson 14 (FIG. 4A) provided on the back side of the assembled wave-breaking caisson 10 is used.
A horizontal pipe 53 is provided inside the caisson 10 and the aquaculture facility provided on the back side of the caisson 14 is connected to the outside sea and the seawater of the aquaculture facility through the horizontal pipe 53. Can be circulated. That is, it is possible to introduce the calm seawater whose wave has been eliminated into the aquaculture facility, and to discharge the dirty seawater in the aquaculture facility to the open sea.

Next, a description will be given of a method of constructing the prefabricated breakwater type caisson 10. The construction method includes a component manufacturing process, an assembly process, a floating process, and an installation process. First, a component manufacturing process will be described. The assembled wave-breaking caisson 10 is composed of a combination of individual block structures including a plurality of horizontal plates 15 and a wave-breaking structure 18.
Each block structure is manufactured in advance on land and transported into a port using a truck or the like. Since it can be manufactured at a location away from the port, there is no need to secure a work yard in the port, and the shortage of work yards can be eliminated.

Next, the assembling process will be described. The transported block structure is transported onto the FD at sea using a crane or the like installed in a production yard or an FD (Caisson work platform). Then, the assembling type wave-breaking caisson 10 is assembled on the FD by the above-described assembling procedure. Then, a blind plate for preventing seawater from entering is provided in the opening 19 of the assembled wave-breaking caisson 10. The blind plate, for example,
An iron plate, a rubber plate, or a steel plate having a waterproof structure provided with a rubber packing around the iron plate is used, and it can be attached by fastening with bolts and nuts or by solidifying after applying a caulking agent. By merely closing the opening 19, the assembled wave-dissipating caisson 10 can be made to have a hollow structure to prevent intrusion of seawater, so that the wave-dissipating caisson, which was conventionally impossible, can be towed by a ship.

Next, the floating step will be described. FD is
Seawater can be poured into the interior space and submerged.
When the FD sinks in the water, the built-in wave-breaking caisson 10 on which it is mounted has a hollow structure and floats on the sea. This simplifies movement and eliminates undersea assembly operations. The installation process will be described. The assembled wave-breaking caisson 10 floating on the sea is lifted by a hoist ship and towed to the installation site by a small boat. And assembling type wave-breaking caisson 1
Water is injected into the inside of 0 (inner space) and installed on the seabed at a predetermined location. Water injection is at the bottom of the prefabricated wave-breaking caisson 10,
Alternatively, it can be carried out by providing a removable plug attached to the blind plate and removing it. In addition, water can be injected by removing a part of the blind plate instead of the stopper. In addition, when installing in the place near the land, such as a revetment wall, it is also possible to carry out a part by a small hoist ship without using FD, and to assemble underwater. Since it is a built-in caisson, there is no need to use a large hoist ship.
By these steps, the assembling operation, which was conventionally performed in water, can be performed on water using the FD, so that the operation is simplified and the construction period can be shortened. Although one embodiment has been described above, the present invention is not limited to the embodiment. For example, in the embodiment, the first to fourth connection holes 23, 24, 30, 31
Is triangular in plan view, but may be circular.

[0025]

According to the prefabricated wave-breaking caisson according to any one of claims 1 to 4, since the portion other than the opening has a blind structure,
By closing the opening, the assembled wave-breaking caisson can be floated on water, and can be stably transported. Also, the horizontal plate can suppress the vertical movement of the wave, and the wave-dissipating structure can change the traveling direction of the wave in the horizontal direction, so that the energy of the wave can be effectively reduced. In particular, in the prefabricated type wave-dissipating caisson according to the second aspect, since the horizontal plate and the wave-dissipating structure are formed with connection holes penetrating vertically, the horizontal plate and the wave-dissipating structure are assembled with each other. It can be firmly fixed inside the mold caisson, and damage due to waves can be prevented. In the prefabricated wave-breaking caisson according to claim 3, the wave-breaking structure comprises:
Since it is composed of two divided wave-absorbing structures having essentially the same structure, the production and handling of members can be facilitated and the assembling time can be reduced.

According to a fourth aspect of the present invention, there is provided the assembly type wave-absorbing caisson having a vertical plate portion erected at the center of the horizontal plate.
A wave passage hole that penetrates vertically is formed in the rear, so that waves can collide with the vertical plate part and promote the splitting and merging of waves, and the energy of the waves can be reduced. Seawater can flow out gently because it passes freely through the wave opening. In the method for constructing a prefabricated type wave-dissipating caisson according to the fifth aspect, since the prefabricated type wave-dissipating caisson is manufactured on an offshore caisson operation workboat, congestion in a land-based manufacturing location can be avoided. . In addition, a blind plate for preventing water leakage is provided at the opening of the assembled wave-breaking caisson and floated on the water and towed to a predetermined position, so that it can be transported by a small hoist ship or a work boat.

[Brief description of the drawings]

FIG. 1 is a perspective view of an assembled wave-breaking caisson according to an embodiment of the present invention.

FIGS. 2A and 2B are a perspective view of the wave-dissipating structure and a perspective view of the horizontal plate, respectively.

FIG. 3 is an explanatory diagram of the wave canceling structure and a horizontal plate.

FIGS. 4A and 4B are explanatory diagrams showing the installation state of the wave-absorbing structure of the assembled wave-breaking caisson according to the modified example and FIGS.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Prefabricated type wave-dissipating caisson 10a Prefabricated type wave-dissipating caisson 11 Bottom plate 12 Side plate 13 Ceiling plate 14 Caisson 15 Horizontal plate 16 First divided wavebreaking structure 17 Second divided wavebreaking structure 18 Wavebreaking structure 18a Diagonal plate pair 19 Opening 20 Front plate 21 Rear plate 22 Diagonal plate 23 First connection hole 24 Second connection hole 25 Connection rib 25a Connection rib 26 Connection rib 26a Connection rib 27 Rear plate 28 Slanted plate Part 29 Front plate part 30 Third connection hole 31 Fourth connection hole 32 Vertical plate part 33 Wave passage hole 34 Fifth connection hole 35 Sixth connection hole 36 Seventh connection hole 37 Eighth connection hole 38 Lifting brackets 39 Lifting brackets 40 Lifting brackets 41 Lifting brackets 44 Gap plates 45 Bolts 46 Nuts 47 Fixing brackets 48 Fixing brackets 49 Gap plates 50 Open sea 51 Inside the bay 52 Crushed stone 3 pipe

Claims (5)

[Claims] 1. A wave-dissipating caisson having a blind structure on the other surface except for openings formed in a front surface at a predetermined pitch, wherein a plurality of horizontal plates partition each stage and are arranged side by side. A front plate portion provided with the opening, a rear plate portion forming a blind structure on the back surface, and X connecting the front plate portion and the rear plate portion on the horizontal plate adjacent to each other. And a wave-breaking structure that is stacked vertically in a fixed state via the horizontal plate. 2. The assembly type wave canceling caisson according to claim 1, wherein first to fourth connection holes vertically penetrating are provided immediately behind both sides of said front plate portion and immediately before both sides of said rear plate portion. The horizontal plate is formed with fifth to eighth connection holes communicating with the first to fourth connection holes, and a reinforcing bar or a shaped steel is inserted into the first to eighth connection holes. And an assembly type wave-absorbing caisson, wherein concrete is poured to fix the horizontal plate and the wave-absorbing structure. 3. The prefabricated wave-absorbing caisson according to claim 1, wherein the front plate portion and the rear plate portion are divided into two in the front-rear direction around the opening. In addition, the front plate portion and the rear plate portion, which are divided into two, have a height that is half of the height of the wave-absorbing structure, and are formed so as to be deviated in any one of the upper and lower directions. An assembling type wave-absorbing caisson characterized by being composed of divided wave-absorbing structures having essentially the same structure connected diagonally. 4. The assembled wave-damping caisson according to any one of claims 1 to 3, wherein a center position of said horizontal plate is provided between said adjacent slanted plate portions in an assembled state. An assembling type wave-dissipating caisson, comprising: a vertical plate portion to be provided; and a wavy hole vertically penetrating behind the vertical plate portion. 5. A method of constructing a wave-absorbing caisson having a blind structure on the other surface except for openings formed at a predetermined pitch on the front surface and having a space inside at the time of manufacture, wherein the wave-absorbing caisson is provided. A caisson is composed of a combination of individual block structures including a plurality of horizontal plates and a wave-absorbing structure, and a step of previously manufacturing the block structure required to form the wave-absorbing caisson at a predetermined location; Transporting the manufactured block structure to a caisson working boat on the sea, assembling the wave-dissipating caisson thereon, and preventing seawater from entering through the opening of the wave-dissipating caisson. Providing a plate, placing seawater in the space inside the caisson working platform, submerging the caisson working platform, and floating the wave-breaking caisson on the sea; Floated on Towing the wave-breaking caisson to a predetermined place, injecting water into the wave-breaking caisson, and installing the wave-breaking caisson on the seabed at the predetermined place. How to build.