WO2017175676A1

WO2017175676A1 - Method for improving breakwater structure

Info

Publication number: WO2017175676A1
Application number: PCT/JP2017/013569
Authority: WO
Inventors: 圭安藤; 直人竹ヶ鼻; 啓荻野; 保人片岡
Original assignee: 株式会社神戸製鋼所
Priority date: 2016-04-04
Filing date: 2017-03-31
Publication date: 2017-10-12
Also published as: JP2017186759A; JP6630610B2

Abstract

A method for improving a breakwater structure, according to the present invention, is a method for improving an existing breakwater structure already installed along a coast. The method includes: a breakwater-unit forming step for forming a breakwater unit that blocks waves on the sea side of the existing breakwater structure such that the load applied to the breakwater unit by the waves can be transferred to the existing breakwater structure; a preparing step for preparing a breakwater block that is to be attached on top of the breakwater unit and that has a breakwater surface projecting toward the sea side in a smooth curved shape as the breakwater surface extends upward, the amount of projection of the breakwater surface toward the sea side being greater than the amount of projection of an upper portion of the existing breakwater structure toward the sea side; and an installing step for placing the prepared breakwater block on the breakwater unit formed in the breakwater-unit forming step and fixing the breakwater block on the breakwater unit.

Description

Method for improving wave-proof structure

The present invention relates to a method for improving a wave preventing structure.

Conventionally, wavebreak structures such as seawalls have been installed along the sea. Due to changes in the shape of the ground on the seabed, changes in structures in the harbor, and the like, the height of the waves hitting the coast may be greater than previously assumed. In this case, depending on the wave conditions and the design tide level of the existing wave-breaking structure, there is a possibility that the wave may go over the wave-breaking structure to the land side. For this reason, conventionally, there has been proposed a method for improving a wave-breaking structure in order to prevent waves from getting over the wave-breaking structure or to reduce the flow rate of waves over the wave-breaking structure (overflow flow rate). ing. Patent Document 1 below shows an example of such an improved method.

In the improved method shown in Patent Document 1 below, overtopping is prevented by attaching a wave-dissipating wall having an L-shaped shape upside down to the upper end of the quay as an existing wave-breaking structure. . Specifically, the wave-dissipating wall is attached to the upper part of the quay so that a substantially horizontally extending portion of the upper part of the wave-dissipating wall having the above shape protrudes from the upper end of the quay to the sea side. As a result, the rising wave hitting the sea-side surface of the quay hits the substantially horizontally extending portion of the wave-dissipating wall and reverses to prevent overtopping.

However, in the improved method of Patent Document 1, there is a possibility that a problem in strength of the quay and / or the wave-dissipating wall may occur.

Specifically, a portion of the wave-dissipating wall that protrudes substantially horizontally from the upper end of the quay to the sea side is hit by a wave from the lower side. A large load is applied near the inverted L-shaped bent portion of the wave wall. For this reason, there exists a possibility that a wave-dissipating wall may be damaged. In addition, the wave-dissipating wall is connected to the quay using bolts and nuts. However, when the wave hits the wave-dissipating wall, the connecting part of the bolts and nuts is damaged and the connecting part is damaged. There is a fear. In addition, since a large load is applied to the part of the quay where the wave breaker is connected, when the wave hits the wave breaker, if the strength of the quay is insufficient due to factors such as aging, the quay May be damaged.

Japanese Utility Model Publication No. 55-140517

An object of the present invention is to provide an improved method for improving a wave-breaking structure so as to suppress overtopping and to withstand a load applied by receiving waves.

In order to achieve the above object, for example, a method of forming a new revetment integrally with the existing revetment on the existing revetment by placing concrete on the existing revetment on the site so as to raise the existing revetment Can be considered. According to this method, since the existing revetment is raised, overtopping can be suppressed. In addition, the new revetment is formed to raise the existing revetment, and does not have a part that protrudes substantially horizontally from the upper end of the existing revetment, such as the wave-dissipating wall used in the conventional improvement method, to the sea side. When received, it can prevent a large load on the newly built revetment. Moreover, in this method, since a new revetment that is integrated with the existing revetment is formed by placing concrete, a large local load such as that applied to the vicinity of the joint portion between the bolt and the nut in the conventional improved method, It will not be applied to the new revetment and will not be added to the existing revetment. However, with this method, the weight of the new revetment formed on the existing revetment is applied to the existing revetment. The existing revetment may be damaged. In addition, when the existing revetment is aged, the existing revetment may be damaged by wave power.

In addition, after the new revetment is formed integrally with the existing revetment, the height and wave power of the rushing waves are reduced by the wave breaker block by stacking wave-dissipating blocks on the sea side of the new revetment and the existing revetment. It is also conceivable to reduce the load applied to the revetment as well as to control However, in this case, sand waves, reefs, and the like are lost due to the wave-dissipating block, causing a problem in terms of landscape and environment.

Therefore, in order to solve these problems, the inventor of the present application has invented the following method for improving a wave-proof structure.

A method for improving a wave-breaking structure according to one aspect of the present invention is a method for improving an existing wave-breaking structure installed along a coast, wherein the wave-breaking body that catches a wave is the existing wave-breaking structure. On the sea side of the structure, a wave-breaking body forming step for forming the load received by the wave-breaking body from the wave in a form that can be transmitted to the existing wave-breaking structure, and a wave-proofing body to be mounted on the wave-breaking body A wave block having a wave surface that protrudes toward the sea side with a smooth curved surface toward the upper side, and the amount of protrusion of the wave surface to the sea side is the sea side of the upper part of the existing wave structure A preparation step for preparing a larger one than the amount of protrusion to the device, and installation for fixing the prepared wave preventing block on the wave preventing body formed in the wave preventing body forming step A process.

It is a perspective view which shows the whole wave-proof structure after improving with the improvement method which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the wave-proof structure after improvement of 1st Embodiment in the direction orthogonal to a shore, and its periphery. It is a perspective view of the wave-proof block which comprises a wave-proof structure. It is explanatory drawing which shows the improvement method which concerns on 1st Embodiment. It is explanatory drawing which shows the improvement method which concerns on 1st Embodiment. It is explanatory drawing which shows the improvement method which concerns on 1st Embodiment. It is explanatory drawing which shows the improvement method which concerns on 1st Embodiment. It is explanatory drawing which shows the improvement method which concerns on 1st Embodiment. It is the longitudinal cross-sectional view of the wave-proof structure after improving with the improvement method which concerns on 2nd Embodiment of this invention, and its periphery. It is explanatory drawing which shows the improvement method which concerns on 2nd Embodiment. It is explanatory drawing which shows the improvement method which concerns on 2nd Embodiment. It is explanatory drawing which shows the improvement method which concerns on 2nd Embodiment. It is explanatory drawing which shows the improvement method which concerns on 2nd Embodiment.

A preferred embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view showing an entire wave-breaking structure 1 after being improved by the improvement method according to the first embodiment of the present invention. The improvement method which concerns on this 1st Embodiment improves the existing revetment 100 which is the existing wave-breaking structure originally installed along the coast, and uses the existing revetment 100 to improve the breakwater A structure 1 is formed.

As shown in FIG. 4, the existing revetment 100 has a base portion 101, an intermediate portion 102, and an upper portion 103.

The base portion 101 is the lower end of the existing revetment 100. The ground on the sea side is lower than the ground on the land 111 side with a certain level difference. The base portion 101 is installed on the ground on the lower sea side. The intermediate portion 102 is a portion extending upward from the base portion 101. The intermediate portion 102 has a sea side surface that is inclined toward the land 111 as it goes upward. The upper portion 103 is a portion that extends further upward from the intermediate portion 102. The upper portion 103 has a sea side surface which is a vertical surface. The height position of the upper end of the upper portion 103, that is, the height position of the top surface 104 of the existing revetment 100 substantially matches the height position of the ground surface of the land 111. The base portion 101, the intermediate portion 102, and the upper portion 103 are integrally formed of concrete. However, the structure of the existing revetment 100 is not necessarily limited to the above structure. That is, the base portion 101, the intermediate portion 102, and the upper portion 103 may have a shape other than the shape shown in FIG.

In the improved method according to the first embodiment, the entire existing revetment 100 is used. Specifically, in the improvement method according to the first embodiment, the existing revetment 100 is provided by providing the newly installed portion 2 (see FIG. 1) so as to be integrated with the existing revetment 100 on the sea side of the existing revetment 100. And the improved wave-proof structure 1 which consists of the newly provided part 2 is formed.

FIG. 2 shows a wave-proof structure 1 and a longitudinal section around it in a direction perpendicular to the coast. The new part 2 is a part newly established by the improvement method of the first embodiment. The new unit 2 includes a wall body 8, a plurality of wave blocking blocks 10, and a back structure 12.

The wall body 8 is a wave preventing body that receives waves. The wall body 8 is formed on the sea side of the existing revetment 100 in a form capable of transmitting a load from waves to the existing revetment 100. The wall body 8 is formed of concrete so as to cover the side surfaces of the foundation portion 101 and the intermediate portion 102 of the existing revetment 100 on the sea side. The wall body 8 has a predetermined thickness from the sea side surface of the existing revetment 100 to the sea side. The wall body 8 is installed on the ground adjacent to the sea side of the ground on which the base portion 101 of the existing revetment 100 is installed. The wall body 8 has a sea side surface 13 that faces the sea side and receives a wave.

The height of the wall 8 is set lower than the height of the existing revetment 100. In other words, the height position of the upper end of the wall body 8 from the ground is set to a position lower than the height position of the upper end of the existing revetment 100 from the ground. That is, the top surface 14 of the wall 8 is set to a position that is one step lower than the top surface 104 of the existing revetment 100, specifically, a height position corresponding to the height position of the upper end of the intermediate portion 102 of the existing revetment 100. The

Since the wall body 8 is formed by placing concrete on the sea side surface of the existing revetment 100 as will be described later, the wall body 8 is already installed at the contact interface between the wall body 8 and the sea side surface of the existing revetment 100. Integrated with revetment 100. A plurality of anchors 105 are driven into the existing revetment 100 so as to protrude from the side surface of the existing revetment 100 on the sea side. The protruding portions of these anchors 105 are embedded in the wall body 8 in the process of forming the wall body 8. Thereby, the integrity of the wall 8 with respect to the existing revetment 100 is improved.

The plurality of wave blocking blocks 10 are installed on the top surface 14 of the wall 8 so as to be adjacent to each other along the coast. Each wave-breaking block 10 has a wave-breaking surface 16 facing the sea side (offshore side). The wave preventing surface 16 is a surface that receives a wave when a high wave hits the coast. The wave-breaking surface 16 has a curved surface shape that smoothly protrudes to the offshore side toward the upper side, for example, a curved surface shape having an arc shape or a parabolic shape in a longitudinal section. The amount of the wave-breaking surface 16 projecting to the offshore side is larger than the amount of projecting the offshore side of the upper portion 103 of the existing revetment 100. In a state in which each wave blocking block 10 is installed on the wall body 8, the wave blocking surface 16 of each wave blocking block 10 and the sea side surface 13 of the wall body 8 are continuous. The wave preventing surface 16 and the sea side surface 13 form the wave preventing surface 18 of the improved wave preventing structure 1.

Each wave block 10 has a frame 22 and a wave barrier 24 as shown in FIG.

The frame 22 is made of steel and serves as a base of the wave preventing block 10. The frame 22 includes a curved plate portion 28, a bottom plate portion 29, and a pair of side plate portions 30.

The curved plate portion 28 is made of a steel plate and has a curved shape along the wave preventing surface 16. The curved plate portion 28 has a land side surface 28a that is a curved surface facing the land 111 side (opposite the sea side) in a state where the wave blocking block 10 is arranged so that the wave preventing surface 16 faces the sea side.

The bottom plate part 29 is located at the lower end of the frame 22 and is made of a steel plate arranged horizontally. The bottom plate portion 29 has an edge that is located on the sea side in a state where the wave preventing block 10 is arranged so that the wave preventing surface 16 faces the sea side. The end edge of the bottom plate portion 29 is disposed along the lower end edge of the curved plate portion 28 and is welded to the land side surface 28 a of the curved plate portion 28. The bottom plate portion 29 is formed with a plurality of insertion holes 29a for inserting the anchors 32 (see FIG. 2). The anchor 32 is embedded in the wall body 8 when the wave blocking block 10 is installed on the wall body 8, thereby fixing the position of the wave blocking block 10.

The pair of side plate portions 30 are spaced from each other in the direction along the sea side edge of the bottom plate portion 29. One side plate portion 30 is disposed near one end portion of the bottom plate portion 29 in a direction along the sea side edge of the bottom plate portion 29. The other side plate portion 30 is disposed in the vicinity of the end portion of the bottom plate portion 29 opposite to the one end portion. Each side plate part 30 consists of a steel plate. The side plate portions 30 are erected on the bottom plate portion 29 by welding their lower end edges to the upper surface of the bottom plate portion 29. Further, each side plate portion 30 has an edge on the curved plate portion 28 side, and this edge forms a curved shape along the land side surface 28 a of the curved plate portion 28. The edge of each side plate portion 30 on the curved plate portion 28 side is welded to the land side surface 28 a of the curved plate portion 28.

The above-described configuration of the frame 22 including the shape of the frame 22 and the fixing form of the bottom plate portion 29 by the anchor 32 is merely an example. The configuration of the frame in the present invention is not necessarily limited to the above, and the frame may have a configuration different from the above configuration.

The wave preventing wall 24 is a part that forms the wave blocking surface 16 of the wave blocking block 10. The wave preventing wall 24 is made of concrete and covers the sea side surface of the curved plate portion 28 and the peripheral portion of the curved plate portion 28. The lower end portion of the wave preventing wall 24 protrudes slightly below the bottom plate portion 29.

The back structure 12 is disposed behind the wave breaker wall 24 of the wave breaker block 10, specifically, on the land 111 side with respect to the wave breaker wall 24. The back structure 12 connects the wall 8, the wave breaker block 10, and the existing revetment 100 to each other. The back structure 12 covers each side plate 30 of the frame 22 of each wave-block 10, the land side surface 28 a of the curved plate 28, the bottom plate 29, and the top surface 14 of the wall 8, and each wave-block The space between the 10 wave barriers 24 and the curved plate portion 28 and the upper portion 103 of the existing revetment 100 is filled.

The back structure 12 has a top surface 12a that is substantially flush with the top surface 24a of the wave preventing wall 24 of the wave blocking block 10. The top surface 2a of the newly installed portion 2 is formed by the top surface 24a of the wave preventing wall 24 and the top surface 12a of the back structure 12. The top surface 2 a of the newly installed part 2 is disposed at a position higher than the top surface 104 of the existing revetment 100, that is, a position higher than the ground of the land 111.

In addition, the structure of the top surface 12a of the back structure 12 and the side surface on the land 111 side is not necessarily limited to that shown in FIG. For example, the upper part of the new part 2 can be used for a promenade and other uses, and the shape of the side surface on the top surface 12a and / or the land 111 side of the rear structure 12 is changed according to the use. Also good.

FIGS. 4 to 8 are explanatory views showing a method for improving the wave-proof structure according to the first embodiment. The improvement method according to the first embodiment includes a preparation process, a wave preventing body forming process, an installation process, and a back structure forming process. Hereinafter, each step of the improvement method of the wave-proof structure according to the first embodiment will be described in detail with reference to FIGS.

(A) Preparation Step This preparation step is a step of preparing a plurality of wave-breaking blocks 10 to be attached on the wall body 8 as a wave-breaking body at a site where the existing revetment 100 is installed. In the preparation step, when the wave blocking block 10 is installed on the wall body 8, the wave blocking surface 16 squeezes out toward the sea side (offshore side) with a smooth curved surface toward the upper side. A wave blocking block 10 is prepared in which the amount of protrusion to the sea side (offshore side) is larger than the amount of protrusion of the upper portion 103 of the existing revetment 100 to the sea side (offshore side). The wave-breaking block 10 to be prepared is composed of a composite of a steel frame 22 and a concrete wave-breaking wall 24. Specifically, the preparation process includes the following manufacturing process and conveyance process.

(A-1) Manufacturing Process In this manufacturing process, a plurality of breakwater blocks 10 are manufactured at a factory away from the site where the existing revetment 100 is installed. In this manufacturing process, first, a steel frame 22 (see FIG. 3) is produced. At this time, the curved curved plate portion 28, the bottom plate portion 29, and the pair of side plate portions 30 along the wave preventing surface 16 (see FIG. 2) are formed by processing a steel plate. Then, the frame 22 is produced by welding the curved plate portion 28, the bottom plate portion 29, and the pair of side plate portions 30 to each other. Next, a mold frame is assembled around the curved plate portion 28 of the manufactured frame 22, and the ready-mixed concrete is poured into a space surrounded by the mold frame to solidify the ready-mixed concrete. As a result, a concrete wave-breaking wall 24 that covers the surface of the curved plate portion 28 facing the sea side and the peripheral portion of the curved plate portion 28 to form the wave-proof surface 16 is formed. In this way, the wave blocking block 10 formed of a composite of the steel frame 22 and the concrete wave blocking wall 24 is formed.

When manufacturing the breakwater block 10, the shape of the breakwater surface 16 is the optimal curved surface shape, the amount of protrusion, etc., to suppress overtopping based on the wave height and other conditions on the coast where the existing revetment 100 is installed Is derived. For example, the optimal shape of the wave preventing surface 16 is derived using the area of the curve formed by the wave preventing surface 16 in the longitudinal section of the wave preventing surface 16. Then, the wave preventing surface 16 of the wave preventing block 10 is formed so as to have the derived shape. In addition, considering the lifting capacity of the crane used in the installation process, which will be described later, and the concrete placement height in the factory in the manufacturing process, the weight and dimensions of the breakwater block 10 are prevented in the direction along the coast. The width of the wave block 10 is set to about 2 m.

(A-2) Transport Process In this transport process, the plurality of wavebreak blocks 10 manufactured in the factory in the manufacturing process are transported by land to a site where the existing revetment 100 is installed by a transport vehicle such as a trailer.

(B) Wavebreaker forming step In this wavebreaker forming step, the wall 8 serving as a wavebreaker that catches waves is placed on the sea side of the existing revetment 100, and the load that the wall 8 receives from the waves is applied to the existing revetment 100. It is formed in a form that can be transmitted to. In other words, this wave breaker forming step includes a wall forming step in which the wall 8 that forms a wave receiving surface is formed on the sea side of the existing revetment 100. In this wall forming process, concrete is placed on the sea side of the existing revetment 100 at the site where the existing revetment 100 is installed, thereby forming a concrete wall 8. At this time, the wall body 8 is formed such that the wall body 8 covers the base portion 101 and the intermediate portion 102 of the existing revetment 100 on the sea side and is integrated with the base portion 101 and the intermediate portion 102. Specifically, the wave preventing body forming step including the wall forming step is as follows.

First, as shown in FIG. 5, a large number of anchors 105 are driven into the base portion 101 and the intermediate portion 102 of the existing revetment 100. These anchors 105 are projected from their sea side surfaces in a state of being driven into the base portion 101 and the intermediate portion 102. Next, the formwork 40 (refer FIG. 6) is installed in the position away from the existing revetment 100 to the sea side. As the formwork 40, one lower than the height of the existing revetment 100 is installed. The mold 40 is supported by an unillustrated support and a separator 41 interposed between the mold 40 and the sea side surface of the existing revetment 100. Further, the separator 41 secures an interval corresponding to the thickness of the wall body 8 to be formed between the mold 40 and the side surface of the existing revetment 100 on the sea side. A large number of reinforcing bars (not shown) are arranged in the space between the formwork 40 and the existing revetment 100.

Also, a plurality of anchors 32 are respectively installed at positions where they should be installed. At this time, for example, an unillustrated support member made of an angle member or other member is connected to the formwork 40 so as to extend from the formwork 40 to a space between the formwork 40 and the existing revetment 100, and the support is provided. By fixing the anchors 32 to the member, the anchors 32 are installed at the predetermined positions where they are to be installed. Moreover, instead of such an installation method, each anchor 32 is attached to a reinforcing bar arranged in a space between the formwork 40 and the existing revetment 100, so that each anchor 32 is to be installed in each predetermined state. You may install in the position.

Then, the concrete body 34 is poured into the space between the mold 40 and the sea side of the existing revetment 100 from the land 111 by the pump car 210, and the wall body 8 is formed by solidifying it. As described above, the wall body 8 is formed so that the wall body 8 covers the base portion 101 and the intermediate portion 102 of the existing revetment 100 on the sea side and is lower than the existing revetment 100. Each anchor 32 protrudes upward from the top surface 14 of the wall body 8 formed as described above, and the lower portion of each anchor 32 is embedded in the wall body 8. After the wall body 8 is formed, the mold 40 is removed.

(C) Installation process In this installation process, the plurality of wave blocking blocks 10 prepared at the site in the preparation process, that is, the plurality of wave blocking blocks 10 manufactured in the factory and then transported to the site in the transport process, It is installed on the top surface 14 of the wall 8 formed in the wall forming process of the body forming process. At this time, the breaker block 10 is lifted by the crane 200 from the land 111 as shown in FIG. By setting the width of the wave breaker block 10 to about 2 m, the wave breaker block 10 is relatively light, and a large crane 200 may not be used as the crane 200 for lifting the wave breaker block 10.

When the breakwater block 10 lifted by the crane 200 is lowered and placed on the top surface 14 of the wall body 8, the anchor 32 protruding from the top surface 14 of the wall body 8 is inserted into the insertion hole 29 a of the bottom plate portion 29. In this way, the wave-blocking block 10 is placed on the top surface 14 and the wave-blocking block 10 is placed at a position where the wave-breaking surface 16 is continuous with the sea surface 13 of the wall 8. As described above, the anchor 32 is inserted into the insertion hole 29a, so that the relative position of the wave blocking block 10 to the wall body 8 is fixed. With the wave blocking block 10 installed on the top surface 14 of the wall 8, the bottom end of the wave blocking wall 24 is in contact with the top surface 14, and the bottom plate 29 is disposed slightly above the top surface 14. Is done. In the installation process, the plurality of wave blocking blocks 10 are arranged on the wall body 8 so that the wave blocking blocks 10 are arranged along the coast and are adjacent to each other. Further, a space is formed between the wave breaker wall 24 and the curved plate portion 28 of the wave breaker block 10 installed by the installation process and the existing revetment 100.

(D) Back structure forming process In this back structure forming process, the plurality of wave blocking blocks 10 installed side by side along the coast in the installation process are covered from the opposite side to the sea side, that is, from the land 111 side, and their prevention. A back structure 12 (see FIG. 2) is formed that connects the wave block 10, the wall body 8, and the existing revetment 100 to each other.

In this rear structure forming process, first, a frame plate 42 (see FIG. 8) is installed on the side opposite to the sea side with respect to the wave blocking block 10, that is, on the land 111 side of the wave blocking block 10. Specifically, the frame plate 42 is installed on the top surface 104 of the existing revetment 100 along the sea side edge of the top surface 104. As a result, the wave barriers 24 and the curved plate portions 28 (see FIG. 3) of the plurality of wave break blocks 10, the upper portion 103 of the existing revetment 100, the frame plate 42, and the top surface 14 of the wall body 8 are surrounded. A space is formed. As shown in FIG. 8, fresh concrete 36 is poured from above land 111 by pump car 210 and solidified to form rear structure 12 (see FIG. 2). After the rear structure 12 is formed, the frame plate 42 is removed.

The wave-proof structure according to the first embodiment is improved by the processes as described above.

In the improvement method of the wave-breaking structure according to the first embodiment, the wave-breaking surface 16 that protrudes toward the offshore side in a smooth curved shape is provided on the wall 8 formed on the sea side of the existing revetment 100. The wave blocking block 10 having a shape in which the protruding amount of the wave preventing surface 16 is larger than the protruding amount of the upper portion 103 of the existing revetment 100 is installed. For this reason, the wave that strikes is received by the wall body 8 and the wave preventing block 10, and the wave can be smoothly returned to the offshore side along the wave preventing surface 16 by the wave preventing surface 16 of the wave preventing block 10. Furthermore, overtopping can be prevented by a large amount of the wave-breaking surface 16 protruding to the offshore side. Therefore, according to the improvement method of the first embodiment, overtopping of the improved wave preventing structure can be effectively suppressed.

Moreover, since the wave-breaking surface 16 of the wave-breaking block 10 returns a wave smoothly along the wave-breaking surface 16 to the offshore side, the wave force added to the wave-breaking block 10 can be received. For this reason, while being able to reduce the load added to the wave-proof block 10 itself, the load added to the wall body 8 from the wave-proof block 10 can also be reduced. As a result, it is possible to prevent the newly installed breakwater block 10 and the wall body 8 from being damaged by receiving waves.

Further, in the improved method of the first embodiment, since the new wall 8 is formed on the sea side of the existing revetment 100 in a form capable of transmitting the load from the waves to the existing revetment 100, the wall against the wave force. 8 and the existing revetment 100 can be countered as one. For this reason, the improved wave-proof structure 1 including the wall body 8 and the existing revetment 100 can have high durability against wave power.

Further, in the improved method of the first embodiment, since the new wall body 8 that receives the waves is formed on the sea side of the existing revetment 100, the existing revetment 100 that has become aging and brittle is directly damaged by the waves. Can be prevented. Further, in the improved method of the first embodiment, since the wave breaker block 10 is installed on the newly installed wall body 8, when the wave breaker block 10 receives a wave, a load is applied from the wave breaker block 10 to the existing revetment 100. Cannot be added. Further, the weight of the wave breaker block 10 can be supported by the newly installed wall body 8, and the weight of the wave breaker block 10 is not applied to the existing revetment 100. Therefore, even if the existing revetment 100 is aged and fragile, the existing revetment 100 can be prevented from being damaged by the load applied from the wave breaker block 10 and / or the weight of the wave breaker block 10.

Further, in the improved method of the first embodiment, overtopping can be suppressed by the function of the wave breaker block 10 as described above without having to build up the wave breaker block on the sea side of the newly installed wall body 8 and the wave breaker block 10. At the same time, the load applied to the existing revetment 100 by the wall body 8 can be reduced. For this reason, the loss | disappearance of the sandy beach and leaf resulting from installation of a wave-dissipating block can be prevented, and the bad influence on a landscape surface and an environmental surface can be suppressed.

Further, in the improvement method of the first embodiment, the wall body 8 is formed by placing concrete on the surface so as to cover the sea side surface of the existing revetment 100. That is, since the seaside surface of the existing revetment 100 can be covered with the new wall body 8, the old existing revetment 100 can be reinforced with the wall body 8.

In the improvement method of the first embodiment, the wall body 8 is formed so that the wall body 8 is lower than the existing revetment 100. For this reason, compared with the case where a new revetment is formed on the existing revetment 100 so that the existing revetment 100 is raised, for example, the construction can be simplified and the cost for the construction can be reduced. Specifically, when a new revetment is formed so as to cover the sea side of the existing revetment 100 and to raise the existing revetment 100, a large-scale formwork and a large scale for supporting the formwork Supporting works need to be installed on the sea side of the existing revetment 100. In this case, large-scale construction is required. On the other hand, in the improvement method of the first embodiment, the wall body 8 is formed so that the wall body 8 is lower than the existing revetment 100. Therefore, the wall body 8 is formed with the mold 40 having a relatively small height. Can be formed. In order to support the formwork 40, a relatively small support work may be installed. Therefore, according to the improvement method of the said 1st Embodiment, while the construction for formation of the wall body 8 can be simplified, the cost concerning the construction can be reduced.

Further, by forming the wall body 8 so that the wall body 8 is lower than the existing revetment 100, the wavebreak block 10 and the rear structure 12 installed on the wall body 8 are supported by the existing revetment 100 from the land side. be able to. For this reason, the wave-proof block 10 can be provided with strong durability against wave power.

Also, the height position of the upper end of the wave preventing block 10 can be made relatively low with the wave preventing block 10 installed on the wall body 8. For this reason, it can prevent that the view over the wave-proof block 10, ie, the view through the improved wave-proof structure 1, deteriorates.

Further, in the improvement method of the first embodiment, the wave blocking block having the steel frame 22 having the curved plate portion 28 and the concrete wave blocking wall 24 that covers the curved plate portion 28 and forms the wave blocking surface 16. 10 is used. For this reason, since the part around the wave-proof surface 16 which touches seawater among the wave-proof blocks 10 is the concrete wave-proof wall 24, corrosion can be prevented. In addition, since the wave blocking block 10 is a composite of the concrete wave blocking wall 24 and the steel frame 22, the tenacity of the wave blocking block 10 against external force can be increased. For this reason, even when the breakwater block 10 receives a large external force such as a tsunami wave force, brittle fracture of the breakwater block 10 can be prevented. Therefore, in the improvement method of the first embodiment, it is possible to prevent brittle fracture of the wave blocking block 10 while preventing corrosion of the wave blocking block 10.

Moreover, in the improvement method of the said 1st Embodiment, the wave-blocking block 10 is prepared at the site where the existing breakwater 100 is installed by manufacturing the wave-blocking block 10 in a factory, and conveying the manufactured wave-breaking block 10 To do. If a wave-breaking structure having the same wave return function and wave overtopping suppression function as the wave-breaking block 10 is to be formed by placing concrete on site, formwork and supporting work supporting it will be provided. It is necessary to install it on the site, and as a result, the work burden increases. On the other hand, according to the improvement method of the first embodiment, the wave-breaking block 10 can be manufactured in a factory equipped with facilities, so that the work load can be reduced compared to the case where the wave-blocking block 10 is formed at the site.

Moreover, in the improvement method of the first embodiment, the wave breaker block 10 is covered from the side opposite to the sea side (the land 111 side), and the wave breaker block 10, the wall body 8, and the existing revetment 100 are connected to each other. Form body 12. For this reason, the connection intensity | strength with the breakwater block 10, the wall body 8, and the existing revetment 100 can be raised. Therefore, the improved wave-proof structure 1 can be strengthened.

Further, in the improved method of the first embodiment, a frame plate 42 is installed on the side opposite to the sea side with respect to the wave blocking block 10, that is, on the land 111 side of the wave blocking block 10, and the frame plate 42 and the wave blocking block are arranged. The back structure 12 is formed by placing concrete in a space between the two. That is, the wave blocking block 10 can be used as a part of a mold for forming the back structure 12 with concrete. For this reason, the cost for forming the back structure 12 can be reduced.

Moreover, in the improvement method of the first embodiment, the preparation process, the installation process, and the back structure forming process can be performed from the land 111, so that the work load can be reduced compared to the case where the work is performed from the sea side.

(Second Embodiment)
FIG. 9 shows a wave-proof structure 1 after being improved by the improvement method according to the second embodiment of the present invention and a longitudinal section around it. In the improved method according to the second embodiment, the load received by the wave breaker 55 from the wave can be transmitted to the existing revetment 100 on the sea side of the existing revetment 100 by the wave breaker 55 composed of the wall body 8 and the filler 54. Form in form. Specifically, the wall body 8 is provided at a position spaced from the existing revetment 100 to the sea side. Then, the space between the wall body 8 and the existing revetment 100 and the space between the rear structure 12 on the wall body 8 and the existing revetment 100 are filled with a filler 54 made of crushed stone, And pave the sidewalk 56.

10 to 13 are explanatory views showing a method for improving the wave-proof structure according to the second embodiment. The improvement method according to the second embodiment includes a preparation process, a wave-blocking body forming process, a first filling process, an installation process, a back structure forming process, a second filling process, and a paving process. included. Hereinafter, each process of the improvement method of the wave-proof structure which concerns on the said 2nd Embodiment is explained in full detail with reference to FIGS. 9-13.

(A) Preparation Step This preparation step is the same as the preparation step in the first embodiment, and is a step of preparing a plurality of wave blocking blocks 10 at the site where the existing revetment 100 is installed.

(B) Wavebreaker forming step In this wavebreaker forming step, the wavebreaker 55 that catches waves can be transmitted to the sea side of the existing revetment 100, and the load that the wavebreaker 55 receives from the waves can be transmitted to the existing revetment 100. Formed in various forms. This wave-blocking body forming process includes the following wall body forming process and first filling process.

(B-1) Wall body forming process In this wall body forming process, the wall body 8 for constructing the wave breaker 55 is formed by placing concrete at the site where the existing seawall 100 is installed. From the sea side to the sea side. Specifically, first, as shown in FIG. 10, the back formwork 62 is installed at a position away from the existing revetment 100 to the sea side. As the back formwork 62, one lower than the height of the existing revetment 100 is installed. A plurality of separators 65 are interposed between the back formwork 62 and the sea side surface of the existing revetment 100, thereby supporting the back formwork 62 in a state spaced from the existing revetment 100.

Next, a front formwork 64 is installed at a position further away from the back formwork 62 to the sea side, and this front formwork 64 is supported by a support work (not shown). As the front formwork 64, one lower than the height of the existing revetment 100 is installed. An interval corresponding to the thickness of the wall 8 to be formed is secured between the back mold 62 and the front mold 64. In the second embodiment, the thickness of the wall 8 increases from the top to the bottom so that the wall 8 can stand independently on the ground and can independently support the wave blocking block 10 and the back structure 12 from below. The wall body 8 is formed in a shape that increases. For this reason, a space having a shape corresponding to the shape of the wall body 8 is formed between the back mold 62 and the front mold 64. A large number of reinforcing bars (not shown) are arranged in the space between the back mold 62 and the front mold 64. Further, a plurality of anchors 32 are respectively installed at positions where they should be installed. As an installation method of the anchor 32 at this time, an installation method similar to the installation method of the anchor 32 in the wavebreaker forming process of the first embodiment is applied.

Then, the concrete body 66 is poured into the space between the back formwork 62 and the front formwork 64 from the land 111 by the pump car 210 and solidified to form the wall body 8. As described above, the wall body 8 lower than the existing revetment 100 is formed. Each anchor 32 protrudes upward from the top surface 14 (see FIG. 11) of the wall body 8 formed in this way, and the lower portion of each anchor 32 is embedded in the wall body 8. After the wall body 8 is formed, the rear mold 62 and the front mold 64 are removed.

(B-2) First Filling Step In this first filling step, as shown in FIG. 11, the space behind the wall 8 formed in the wave breaker forming step, that is, the wall 8 and the existing revetment 100 is The space between them is filled with a filler 54 made of crushed stone. At this time, the space between the wall 8 and the existing revetment 100 is filled with the filler 54 so that the upper surface of the filler 54 is substantially at the same height as the top surface 14 of the wall 8. This first filling step is performed by throwing crushed stone into the space between the wall 8 and the existing revetment 100 from the land 111 with the shovel 220. By filling the space between the wall body 8 and the existing revetment 100 with the filler 54 as described above, the wave breaker 55 composed of the wall body 8 and the filler 54 is formed.

(C) Installation process In this installation process, similarly to the installation process of the first embodiment, the top surface of the wall body 8 in which a plurality of wave blocking blocks 10 prepared on site in the preparation process are formed in the wave formation process. 14 on top.

(D) Back structure forming step In this back structure forming step, the surface on the land 111 side of the wave blocking walls 24 of the plurality of wave blocking blocks 10 installed on the top surface 14 of the wall 8 and the frame 22 are covered. A back structure 12 (see FIG. 9) that connects the wave-blocking block 10 and the wall body 8 is formed. The rear structure 12 is formed by placing concrete on the land 111 side of the plurality of wave blocking blocks 10 installed on the top surface 14 of the wall 8 so as to be arranged along the coast in the installation process.

Specifically, first, a frame plate 70 (see FIG. 13) is installed along the coast on the land 111 side (opposite the sea side) with respect to the plurality of wave blocking blocks 10. The frame plate 70 is installed on the filling 54 filled in the first filling step along the boundary between the filling region of the filling 54 and the wall body 8. Then, the space between the wave blocking block 10 and the frame plate 70 by the pump vehicle 210 from above the land 111, specifically the surface of the wave blocking wall 24 on the land 111 side and the land side surface 28a of the curved plate portion 28 (see FIG. 3). The ready-mixed concrete 68 (see FIG. 13) is poured into the space between the frame plate 70 and solidified to form the back structure 12 (see FIG. 9). The ready-mixed concrete 68 also enters a gap between the lower surface of the bottom plate portion 29 of the wave-blocking block 10 and the top surface 14 of the wall body 8, and enters the gap and solidifies the wave-blocking block 10 and the wall body through the solidified concrete. 8 are connected to each other. After the rear structure 12 is formed, the frame plate 70 is removed.

(E) Second Filling Step In this second filling step, the space behind the back structure 12 formed in the back structure forming step, that is, the space between the back structure 12 and the existing revetment 100 is filled 54. (See FIG. 9). That is, in the second filling step, crushed stone is further filled on the filling material 54 filled in the first filling step. As in the first filling step, this second filling step is performed by throwing crushed stone into the space between the back structure 12 and the existing revetment 100 from the land 111 with a shovel. In the said 2nd filling process, it fills with the filler 54 from the upper end of the existing revetment 100 to a slightly lower position.

(F) Pavement Step In this pavement step, a pavement 56 (see FIG. 9) is formed by paving the top of the filler 54 filled in the second filling step.

The wave-proof structure according to the second embodiment is improved by the processes as described above.

In the improved method of the second embodiment, the wall body 8 is formed with an interval from the existing revetment 100 to the sea side. Therefore, the wall 8 can be provided even when the sea side of the existing revetment 100 is so old that it is difficult to integrate the wall, and the wall 8 can be provided. The wavebreak block 10 and the back structure 12 can be installed in the front.

In addition, in the improvement method of the second embodiment, the space between the wall 8 and the existing revetment 100 and the space between the rear structure 12 and the existing revetment 100 are replaced with the wall 8, the wave blocking block 10 and the back. It fills with the filler 54 so that a load can be transmitted from the structure 12 to the existing revetment 100. For this reason, when the wall body 8 and the wave-breaking block 10 receive a wave, the new installation part 2 which consists of the wall body 8, the wave-breaking block 10, and the back structure 12, the existing revetment 100, and the filler 54 are integrated. Can counteract wave power. For this reason, the improved wave-proof structure 1 can have higher durability against wave power.

The effects other than the above by the improvement method of the second embodiment are the same as the effects by the improvement method of the first embodiment.

The method for improving a wave preventing structure according to the present invention is not necessarily limited to the above. As a method for improving a wave preventing structure according to the present invention, for example, the following configuration can be adopted.

The height of the wall body formed in the wall body forming process of the wave preventing body forming process can be arbitrarily set. For example, the height of the wall body may be equal to or higher than that of the existing revetment, and may be smaller than the height of the wall body shown in the drawings according to the embodiment.

Also, the height dimension of the wavebreak block can be set arbitrarily. And the height position of the upper end of the improved wave-proof structure can be arbitrarily set by changing at least one of the height of the wall and the height direction of the wave-proof block. Further, the shape of the wave preventing surface of the wave preventing block can be arbitrarily set. The correlation between the height position of the upper end of the improved wavebreaking structure, the shape of the wavebreaking surface of the wavebreaking block, the overtopping flow rate, and the wave pressure acting on the wavebreaking block can be derived by hydraulic experiments, etc. Based on the derived correlation, it is possible to derive the height position of the upper end of the wave-breaking structure and the shape of the wave-breaking surface of the wave-breaking block, which are not excessive or insufficient for the suppression of overtopping. Based on the derived height position of the upper end of the wavebreaking structure and the shape of the wavebreaking surface of the wavebreaking block, the height position of the wavebreaking structure and the shape of the wavebreaking surface of the wavebreaking block can be set.

[Outline of the embodiment]
The embodiment is summarized as follows.

The improvement method of the wave-breaking structure according to the embodiment is a method for improving an existing wave-breaking structure installed along the coast, and the wave-breaking body that receives waves is used as the wave-breaking structure. A wave-breaking body forming step of forming a load received by the wave-breaking body from the waves on the sea side in a form capable of being transmitted to the existing wave-breaking structure, and a wave-breaking block to be mounted on the wave-breaking body And having a wave surface that protrudes toward the sea side in a smooth curved shape toward the upper side, and the amount of protrusion of the wave surface to the sea side is the sea side of the upper part of the existing wave structure to the sea side A preparation step of preparing a larger one than the amount of protrusion, and an installation step of mounting the prepared wave blocking block on the wave blocking body formed in the wave blocking body forming step and fixing the wave blocking block to the wave blocking body; In the preparation step, as the wave-proof block, the upper side It has a wave-proof surface that protrudes toward the sea side with a smooth curved surface as it goes, and the amount of protrusion of this wave-proof surface to the sea side is larger than the amount of protrusion of the upper part of the existing wave-proof structure to the sea side Prepare a wavebreak block.

In this improvement method of the wave-breaking structure, the wave-breaking surface is formed on the wave-breaking body formed on the sea side of the existing wave-breaking structure, and has a wave-shaped surface that protrudes toward the sea side with a smooth curved surface. Install a wave-breaking block that has a larger protruding amount than the protruding amount to the sea side of the upper part of the existing wave-breaking structure. For this reason, the wave that strikes is received by the wave breaker and the wave breaker block, and the wave can be smoothly returned to the offshore side along the wave breakage surface by the wave breaker surface of the wave breaker block. Overtopping can be prevented by a large amount of squeeze. For this reason, overtopping can be effectively suppressed in the improved wave-proof structure. Moreover, since the wave-breaking surface of the wave-blocking block installed on the wave-breaking body returns the wave smoothly along the wave-breaking surface to the offshore side, the wave force applied to the wave-breaking block can be received. For this reason, while being able to reduce the load added to a wave-proof block itself, the load added to a wave-proof body from a wave-proof block can also be reduced. As a result, it is possible to prevent the newly installed wavebreak block and wavebreaker from being damaged by receiving waves.

Further, in this improved method, the new wave breaker is formed on the sea side of the existing wave breakage structure in such a way that the load received by the wave breaker from the wave can be transmitted to the existing wave breakage structure. Therefore, the newly installed wave breaker and the existing wave break structure can be opposed to the wave force as a single unit. For this reason, the improved wave-breaking structure including the new wave-breaking body and the existing wave-breaking structure can have high durability against wave power.

Also, in this improved method, a new wave breaker that catches the waves is formed on the sea side of the existing wave breakage structure, so that the existing wave breakage structure that has become obsolete and damaged is directly damaged by the wave. Can be prevented. In addition, since the wave blocking block is installed on the newly installed wave blocking body, when the wave blocking block receives a wave, no load is applied from the wave blocking block to the existing wave blocking structure. In addition, the weight of the wave breaker block can be supported by the newly installed wave breaker, and the wave breaker block weight is not applied to the existing wave breaker structure. Therefore, even if the existing wave-breaking structure is aged and fragile, the existing wave-breaking structure is prevented from being damaged by the load applied from the wave-breaking block and / or the weight of the wave-breaking block. be able to.

In addition, in this improved method, the overtopping can be suppressed by the function of the wavebreaker block as described above and the wavebreaker can prevent the wave overtopping without having to build up the wavebreaker block on the sea side of the wavebreaker and the wavebreaker block. The load applied to the wave-proof structure can be reduced. For this reason, the loss | disappearance of the sandy beach and leaf resulting from installation of a wave-dissipating block can be prevented, and the bad influence on a landscape surface and an environmental surface can be suppressed.

In the improvement method of the wave preventing structure, the wave preventing body forming step is a wall forming step for forming a wall body that is a portion for forming a wave receiving surface of the wave preventing body. It is preferable to include a step of forming concrete by placing concrete on the site where the existing wave-breaking structure is installed.

In this case, in the wall forming step, the wall may be formed by placing concrete so as to cover the sea side surface of the existing wave-breaking structure.

According to this configuration, since the sea-side surface of the existing wave-breaking structure can be covered with the new wall body, the existing wave-breaking structure that has deteriorated can be reinforced with the wall body.

Further, in the case where the wall body is formed by placing concrete on site, in the wall body forming step, the sea side of the existing wave-breaking structure is spaced from the existing wave-breaking structure. The wall body is formed, and the wave-breaking body forming step includes a step of forming a space between the wall body formed in the wall body forming step and the existing wave-breaking structure from the wall body to the existing wave-breaking structure. It may further include a filling step of filling with a filler so that a load can be transmitted, and in the wave preventing body forming step, the wave preventing body made of the wall body and the filler may be formed.

In this configuration, the wall is formed at an interval from the existing wave-breaking structure to the sea side, so that the sea-side surface of the existing wave-breaking structure is so old that it is difficult to integrate the wall. Even when it is brittle, a wall body can be formed, and a wavebreak block can be installed on the wall body. Moreover, in this configuration, the space between the newly installed wall body and the existing wave-breaking structure is filled with a filler so that a load can be transmitted from the wall body to the existing wave-breaking structure. When a wave receives a wave, the newly installed wall, the filler, and the existing wave-breaking structure can be integrated to counter the wave force. For this reason, the improved wave-proof structure can have higher durability against wave power.

In the improvement method of the wave preventing structure, in the wave preventing body forming step, a portion of the wave preventing body where the wave blocking block is placed in the installation step is lower than the existing wave preventing structure. Thus, it is preferable to form the wave shield.

According to this configuration, for example, the construction can be simplified and the cost for the construction can be reduced compared to the case where a new revetment is formed on the existing breakwater structure so as to raise the existing breakwater structure. it can. Specifically, when forming a new revetment so as to raise an existing wave breaker structure, it is necessary to install a large formwork and a large support to support the formwork on the sea side. There is. For this reason, large-scale construction is required. On the other hand, in this structure, since the part in which a wave-blocking block is mounted becomes lower than the existing wave-breaking structure among wave-blocking bodies, in order to form the part in which this wave-blocking block is mounted The formwork installed on the sea side and the supporting work supporting it can be made relatively small. Therefore, according to this configuration, it is possible to simplify the construction for forming the wave breaker and reduce the cost for the construction. In addition, the part of the wave breaker where the wave breaker block is placed is lower than the existing wave breaker structure, so that the wave breaker block placed on the wave breaker is installed from the land side. Can be supported at the top of the object. For this reason, a wave-proof block can be given more durable durability with respect to wave power. Furthermore, according to this structure, compared with the wave-proof structure improved by raising the existing wave-proof structure or installing the wave-blocking block on the existing wave-proof structure, The height position of the upper end of the wave preventing structure, that is, the height position of the upper end of the wave preventing block can be lowered. As a result, it is possible to prevent deterioration of the view through the wave-proof structure after the improvement.

In the improvement method of the wave preventing structure, in the preparing step, as the wave preventing block, a steel frame having a curved plate portion having a curved shape along the wave preventing surface, and the wave preventing surface covering the curved plate portion. It is preferable to prepare a wave-breaking block having a concrete wave-breaking wall that forms a wall.

According to this configuration, the portion around the wave-breaking surface that touches seawater in the wave-breaking block becomes a concrete wave-breaking wall, and the curved plate portion of the steel frame is covered with the concrete wave-breaking wall. Corrosion of the curved plate can be prevented. Moreover, since the wave-blocking block is composed of a composite of a wave-breaking wall made of concrete and a steel frame, it is possible to increase the tenacity of the wave-blocking block against external forces. For this reason, even when the breakwater block receives a large external force such as a tsunami wave force, it is possible to prevent brittle fracture of the breakwater block. That is, in this configuration, it is possible to prevent brittle fracture of the wavebreak block while preventing the occurrence of corrosion in the wavebreak block.

In the improvement method of the wave preventing structure, the preparation step includes a manufacturing process of manufacturing the wave blocking block in a factory, and the manufactured wave blocking block is transported to a site where the existing wave blocking structure is installed. And a transporting step.

この According to this configuration, it is possible to reduce the work load for the production of the wavebreak block. Specifically, in the case where a wave-breaking structure having a wave return function and a wave overtopping suppression function equivalent to those of the wave-blocking block is formed by placing concrete on site, a formwork and the It is necessary to install a support work on the site, which increases the work load. On the other hand, according to this structure, since a wave-breaking block can be manufactured in a factory equipped with facilities, the work load can be reduced as compared with the case where it is formed at the site.

The improvement method of the wave preventing structure includes a back structure forming step of forming a back structure that covers the wave blocking block from the land side and connects the wave blocking block and the wave blocking body after the installation step. It is preferable to further provide.

According to this configuration, a stronger structure can be formed by the wave blocking block and the back structure. Moreover, the connection intensity | strength of a wave-blocking block and a wave-proof body can be raised by connecting a wave-blocking block and a wave-proof body with a back structure. Therefore, according to this structure, the improved wave-proof structure can be strengthened.

In this case, in the rear structure forming step, a frame plate is installed on the land side of the wavebreak block, and concrete is placed in a space between the frame plate and the wavebreak block. Preferably a back structure is formed.

この According to this configuration, the breakwater block can be used as a part of a form for forming the back structure with concrete. For this reason, the cost for forming the back structure can be reduced.

As described above, according to the improvement method of the wave-breaking structure according to the embodiment, overtopping can be effectively suppressed, damage to the wave-breaking structure due to the load applied by receiving the wave can be suppressed, and the existing wave-proofing structure can be suppressed. Even if the wave structure is old and fragile, the existing wave-breaking structure can be prevented from collapsing, and the wave-breaking structure can be suppressed so that adverse effects on the landscape and the environment can be suppressed. It can be improved.

Claims

A method for improving an existing wave-breaking structure installed along a coast,
Wavebreaker formation for forming a wavebreaker that catches waves on the sea side of the existing wavebreaker structure in a form that allows the load received by the wavebreaker from the wave to be transmitted to the existing wavebreaker structure Process,
A wave-blocking block to be mounted on the wave-blocking body, having a wave-blocking surface that protrudes toward the sea side in a smooth curved shape toward the upper side, and the amount of protrusion of the wave-proof surface to the sea side is A preparation process of preparing a larger one than the amount of protrusion of the upper part of the wave preventing structure to the sea side;
A method for improving a wave preventing structure, comprising: a step of placing the prepared wave blocking block on the wave blocking body formed in the wave blocking body forming step and fixing the wave blocking block to the wave blocking body.
In the improvement method of the wave-proof structure of Claim 1,
The wave-breaking body forming step is a wall-forming process for forming a wall body that is a portion that forms a wave receiving surface of the wave blocking body, and the existing wave-breaking structure is installed on the wall body. The improvement method of a wave-proof structure including the process formed by pouring concrete on the site where it is done.
In the improvement method of the wave-proof structure of Claim 2,
In the wall body forming step, the wave body structure is improved by forming the wall body by placing concrete so as to cover a sea side surface of the existing wave body structure.
In the improvement method of the wave-proof structure of Claim 2,
In the wall forming step, the wall is formed on the sea side of the existing wave-breaking structure with a gap from the existing wave-breaking structure,
In the wave preventing body forming step, a load can be transmitted from the wall body to the existing wave preventing structure through a space between the wall formed in the wall forming step and the existing wave preventing structure. A filling step of filling with a filler as
In the wave preventing body forming step, the wave preventing structure is formed by forming the wave preventing body including the wall body and the filler.
In the improvement method of the wave-proof structure of Claim 1,
In the wave breaker forming step, the wave breaker is formed such that a portion of the wave breaker where the wave breaker block is placed in the installation step is lower than the existing wave breaker structure, Improvement method of wave-proof structure.
In the improvement method of the wave-proof structure of Claim 1,
In the preparation step, as the wave blocking block, a steel frame having a curved curved plate portion along the wave blocking surface, and a concrete wave blocking wall that covers the curved plate portion and forms the wave blocking surface, The improvement method of a wave-proof structure which prepares the wave-proof block which has this.
In the improvement method of the wave-proof structure of Claim 1,
The preparation process includes a manufacturing process for manufacturing the wavebreaking block in a factory, and a transporting process for transferring the manufactured wavebreaking block to a site where the existing wavebreaking structure is installed. A method for improving structures.
In the improvement method of the wave-proof structure of Claim 1,
A method of improving a wavebreaking structure, further comprising a rear structure forming step of forming a rear structure that covers the wavebreaking block from the land side and connects the wavebreaking block and the wavebreaking body after the installation step. .
In the improvement method of the wave-proof structure of Claim 8,
In the rear structure forming step, a frame plate is installed on the land side of the wave-blocking block, and concrete is placed in a space between the installed frame plate and the wave-blocking block to thereby form the back structure. The improvement method of the wave-proof structure formed.