JP2013177766A - Different hardness tube, junction structure of coastal protection structure, laying method of coastal protection structure, and removal method of coastal protection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a different hardness tube which is in an easy-to-manufacture simple structure and can be laid without a gap or a step at a junction of a coastal protection structure, and a laying technology of the coastal protection structure.SOLUTION: A different hardness tube for the coastal protection structure, in which a filler is enclosed, comprises: a tubular cylindrical body opened at both ends; a plurality of fill/drain ports provided on a part of the cylindrical body so as to fill the filler inside the cylindrical body; and a closing bag attached to at least one end part opening of the cylindrical body. The cylindrical body and the closing bag are formed of different materials with different hardness, and the closing bag is formed of a soft material compared to the flexible cylindrical body.

Description

  The present invention relates to a coastal conservation technique, and relates to a different rigid tube formed by combining materials having different hardnesses, a joint structure of a coastal conservation structure, a method for laying a coastal conservation structure, and a method for removing a coastal conservation structure.

As one of countermeasures against coastal erosion, there is known a revetment method in which a tube-shaped coastal protection structure 60 having both ends closed as shown in FIG. 8 is laid along the coastline.
The coastal protection structure 60 is a heavy article having a height of several meters and a total length of several tens of meters, and is produced by filling a filling material 62 such as sand in a tube-shaped bag body 61 on site.
The bag body 61 is made of a resin sheet having a smooth surface. However, repeated wear of sand drift and the like causes severe wear of the bag body 61 and a problem in durability.

The applicant previously proposed a special wear-resistant sheet in which a large number of pile groups were planted on the surface of a sheet-like base as a material for a coastal protection structure with excellent durability suitable for the revetment method (patent document) 1).
This sheet has many advantages that the piles on the surface remarkably enhance the abrasion resistance against sand drift and the like, and further improve the environment by improving adhesion of phytoplankton and seaweed.

JP 2011-25664 A

The conventional techniques described above have the following problems.
<1> As shown in (B) of FIG. 8 which shows the plane of the junction part of the coastal conservation structure 60, or (C) of FIG. When the inside filling material 62 is filled in the bag body 61 that is closed, the closed end portion of the coastal protection structure 60 is naturally tapered.
For this reason, the tapered closed end portions of the respective coastal protection structures 60 are laid to face each other, and a planned laying height and a uniform cross-sectional shape cannot be secured at the joint portion.
<2> A gap 63 and a step 64 are formed at the joint between the coastal protection structures 60 and 60 whose closed ends have a tapered shape.
If the gap 63 is left as it is, the stability of the coastal protection structure 60 is impaired due to the acceleration of the outflow and erosion of the coastal sand, and there is a risk of causing a person or vehicle fall accident due to the step 64.
<3> In order to solve the above-mentioned problem, it is possible to consider a countermeasure work that covers the gap 63 and the level difference 64 by covering the joint with sand or the like, or is covered with a separate sheet material. In the latter countermeasure work, there is a problem that the burden increases in both the construction cost and the construction period.
<4> When the conventional coastal protection structure 60 is moved or removed, it is necessary to take out the filling material 62 from the bag body 61, but the structure is not designed to take out the filling material 62.
Therefore, if the bag body 61 is destroyed, the filling material 62 can be taken out, but the bag body 61 is forced to be disposed of, which is uneconomical.

The present invention has been made in view of the above points, and the object of the present invention is to provide a non-rigid structure that can be laid without any gaps or steps at the joint of the coastal protection structure with a simple structure that is easy to manufacture. It is to provide the laying technology of the tube and the coastal protection structure.
Furthermore, the objective of this invention is providing the removal technique of the coastal protection structure which removes a coastal protection structure without destroying so that a different rigid tube can be reused.

The present invention is a hetero-rigid tube for a coastal maintenance structure enclosing a filling material, a tubular cylindrical body with both ends open, and so that the filling material can be filled inside the tubular body, The pipe body is composed of a plurality of outlets provided in a part of the cylinder body and a closed bag attached to at least one end opening of the cylinder body, and the cylinder body and the closed bag are different in hardness. The closed bag is made of a material that is softer than the flexible cylinder body.
The cylinder body is preferably made of an abrasion-resistant sheet formed by integrally planting a plurality of pile groups on the surface of a hard base.
You may close the edge part opening of the both ends of the said cylinder main body with the said closing bag.
The present invention is a joint structure of a coastal protection structure in which closed ends of a plurality of coastal protection structures manufactured by enclosing a filling material in the field in a bag body closed at both ends are laid adjacent to each other, Using the above-mentioned different rigid tube as the bag body, filling the different rigid tube for the preceding coastal protection structure with the filling material, and bulging the closed bag from the end of the cylinder body to form the bulging part, In the state where one end of the different rigid tube for the coastal coastal protection structure is abutted against the different rigid tube for the preceding coastal conservation structure, the different rigid tube for the subsequent coastal conservation structure is filled with the filling material. In the state where the closed bag is brought into close contact with the bulging portion to form a receiving portion, and the bulging portion is accommodated in the receiving portion, both of the different rigid tubes for the preceding and following coastal protection structures are formed. The ends of the cylinder body are butted together, and the bulging part and the receiving part are restrained by the two cylinder bodies Characterized in that was.
The present invention is to construct a coastal protection structure by enclosing a filling material in a bag in which both ends are closed on site, and laying a coastal protection structure in which closed ends of a plurality of coastal protection structures are laid adjacent to each other A method of using the above-mentioned different rigid tube as the bag body, filling the different rigid tube for the preceding coastal conservation structure with a filling material, and producing the preceding coastal conservation structure, and the subsequent coastal conservation structure. In the state where one end of the cylinder main body constituting the different rigid tube for the body is abutted with the other end of the cylinder main body constituting the different rigid tube for the preceding coastal maintenance structure, the different difference for the subsequent coastal protection structure is provided. Filling a hard tube with a filling material to produce a follow-up coastal protection structure, and leading the bulging part by inflating the closed bag from the end of the cylinder body that forms the different rigid tube for the preceding coastal protection structure Formed along the bulge, and the Both cylinders constituting the different rigid tubes for the preceding and succeeding coastal protection structures in a state in which the closed bag constituting the tube is closely contacted to form a receiving portion and the bulging portion is accommodated in the receiving portion It is characterized in that the end of the main body is abutted.
The plurality of coastal protection structures are laid in one extending direction, or the plurality of coastal protection structures are laid in the extending direction at both ends of the preceding coastal protection structure.
The present invention is a method for removing a coastal protection structure, comprising the step of forming an opening in a part of an exposed bulge at the end of a subsequent coastal protection structure located at the end, Repeating the step of discharging the filling material slurried by pouring water into the downstream coastal protection structure located at the end through the opening and the step of removing the hard tube having discharged the filling material. Features.

The present invention has at least one of the following effects.
<1> By using a differently rigid tube having a simple structure and made of materials having different hardnesses, it is possible to lay the joint of the coastal maintenance structure without any gaps or steps.
<2> When removing the coastal protection structure, an opening is formed in a part of the bulged portion where the different rigid tube is exposed, and the filled material slurried by pouring water through the opening can be discharged.
Therefore, since the opening of the closed bag body can be easily restored, the different rigid tube can be reused any number of times, which is economical.
<3> Adjacent coastal protection structures can be joined with high joint strength by using different rigid tubes in which materials having different hardnesses are combined.
Therefore, even if an external force such as waves is applied to the joint of the coastal protection structure, the joint does not become a strong weak point, and connecting means such as connecting brackets and rope materials are added between adjacent coastal protection structures There is no need to deploy.
<4> When removing the coastal protection structure, an opening is formed in a part of the exposed bulging portion without destroying the different rigid tube, and the filling material is slurried by pouring water through this opening. The coastal protection structure can be removed with a simple task of discharging.
Since the opening of the closed bag body can be easily restored, the collected different hard tube can be reused any number of times, which is economical.
<5> Using a wear-resistant sheet with piles on the surface as the material of the tube body of a different rigid tube, the piles are less likely to be worn or worn against drifting sand, etc. With the protection function of sand trapped in the pile group, it is possible to reliably protect the base constituting the wear-resistant sheet from wear and abrasion due to sand drift or the like.
Therefore, the protective function as a coastal protection structure can be maintained for a long time.

Explanatory drawing of the different rigid tube which abbreviate | omitted the part which concerns on Example 1 Explanatory drawing of laying work of preceding coastal protection structure Explanatory drawing of the laying work of the following coastal protection structure adjacent to the preceding coastal protection structure Explanatory drawing of the laying work of the following coastal protection structure adjacent to the preceding coastal protection structure Explanatory drawing of the preceding coastal conservation structure and a different rigid tube with some parts omitted Explanation of removal work of coastal conservation structure Explanatory drawing of the laying operation | work of the coastal maintenance structure which concerns on Example 2. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the coastal conservation structure which this invention presupposes, (A) is sectional drawing of the coastal conservation structure laid in the coastline, (B) is a top view of the coastal conservation structure which faced the closed end part, (C) is a front view of the coastal protection structure with its closed end facing

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Example 1]
<1> Coastal Conservation Structure The coastal maintenance structure 10 is composed of a different rigid tube 20 that is formed in a cylindrical shape with both ends closed and a filling material 40 enclosed in the different rigid tube 20.

<2> Heterogeneous tube It is necessary to use a material with excellent durability that is not damaged by drifting sand, etc. The gap at the joint portion of the maintenance structure 10 cannot be eliminated.
Therefore, in the present invention, the different rigid tube 20 formed of materials having different hardnesses is used.
The different rigid tube 20 is composed of a cylindrical main body 30 with both ends open and a closed bag 35 that closes the end opening of the cylindrical main body 30, and a soft material that is more easily deformed than the cylindrical main body 30 as a material of the closed bag 35. Use.

<2.1> Tube Main Body The tube main body 30 is a tube-like object having both ends opened, and the cross-sectional shape is uniform (identical) over its entire length. The cross-sectional shape of the cylinder body 30 after the filling of the filling material 40 is preferably substantially circular or elliptical, but may be polygonal.

<2.1.1> Injection / Discharge Ports A plurality of injection / discharge ports 31 for filling the filling material 40 are provided in a part of the cylinder main body 30, and each of the injection / discharge ports 31 is configured to be openable and closable. Yes.

<2.1.2> Material of the cylinder main body The end opening of the cylinder main body 30 is not closed with the same material as the cylinder main body 30, but is closed via a separate closing bag 35. The material can be selected without considering the closing process of the end opening.
Therefore, an optimal material can be appropriately selected and used as the material of the tube main body 30 from various known materials. Not only the material but also the layer thickness and hardness can be arbitrarily selected.

  Moreover, if the surface of the cylinder main body 30 is colored with an earth color or the like, the scenery at the site where the coastal protection structure 10 is laid improves.

  In this example, the cylindrical main body 30 is manufactured with a wear-resistant sheet 32 having excellent durability, weather resistance, and the like, which is composed of a flexible hard base 33 and a pile 34 planted on the surface of the base 33. explain.

<2.1.2.1> Base The base 33 is made of a material having excellent durability, weather resistance, wear resistance, and impact resistance that does not wear out due to contact with sand drift and the filling material 40. As the material, for example, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and thermoplastic fibers such as polyolefins such as polyethylene and polypropylene can be used.

<2.1.2.2> Pile Pile 34 is a flexible brushed object that has a function of trapping sand drift, a function of wave absorption and a function of damping wave pressure (wave force). Planted uniformly.
The material of the pile 34 is not particularly limited. For example, a monofilament or a multifilament made of synthetic fiber can be used. In short, the pile 34 is elastically deformed in the front-rear and left-right directions without being plastically deformed by an external force such as sand drift or wave force. Any material having elasticity and rigidity that can be restored to its original shape may be used.

The extending length of the pile 34 is not particularly limited, but is preferably in the range of 1 mm to 500 mm in accordance with the height of aquatic plants such as algae.
When the extending length of the pile 34 exceeds 500 mm, the self-supporting property is impaired and the pile 34 falls down, and when the extending length of the pile 34 is 1 mm or less, the protective function cannot be exhibited.

<2.1.3> Example of production method of cylinder main body The belt-shaped wear-resistant sheet 32 is overlapped in an elongated tube shape, and the overlapped planned closing side is fixed by means such as stitching, adhesion, fusion, etc. A cylindrical tube main body 30 having the same width (diameter) and an open end can be formed.
Suture is suitable as a means for fixing the wear-resistant sheet 32 with the pile 34 so as to prevent the filling material 40 from leaking out and easily open, but the above-described plurality of fixing means may be appropriately combined. .

<2.2> Closure Bag The closure bag 35 is a bottomed bag that functions as a lid for closing the end opening of the cylinder body 30, and the opening side thereof is integrally fixed to the end opening of the cylinder body 30. is there.

<2.2.1> Material of the closed bag The closed bag 35 is made of a flexible sheet that is more flexible than the wear-resistant sheet 32 constituting the cylinder body 30, and has sufficient strength and durability, for example. A polyester civil engineering sheet is suitable, but other known materials such as non-woven fabrics may be used.
The reason why the soft material is used as the material of the closing bag 35 is not only to improve the manufacturability of the bag body but also to improve the deformability and adhesion at the joint portion of the coastal protection structure 10 to increase the joint strength. is there.
The closed bag 35 does not have a pile.

<2.2.2> Closure method of closed bag To attach the closed bag 35 to the end opening of the tube body 30, for example, the closed bag 35 is pre-stitched to the end of the wear-resistant sheet 32 in a belt-like state, Thereafter, the wear-resistant sheet 32 can be attached by forming it in a cylindrical shape.
The method of attaching the closing bag 35 is not limited to the above example, and the closing bag 35 may be retrofitted to the end opening of the completed cylinder body 30.

<2.2.3> Number of Installed Closed Bags In this example, a description will be given of a form in which both end openings of the cylinder main body 30 are closed by the closed bags 35, but at least one end opening of the cylinder main body 30 is closed. If it is closed at.

<3> Filling material The filling material 40 is a member that imparts weight and formability to the coastal protection structure 10, and for example, sand, gravel, metal particles, particles generated from waste, and the like can be used.
It is economical if local sand or the like is used as the filling material 40.

[Laying of coastal conservation structure]
Next, a method for laying the coastal protection structure 10 will be described with reference to FIGS.
In order to help the understanding of the invention, in the drawing, a gap is provided at the joint portion of the coastal protection structure 10, but in reality, these gaps do not exist.

<1> Laying operation of the preceding coastal conservation structure As shown in FIG. 2, the coastal conservation structure is obtained by carrying the hetero-rigid tube 20 into the laying site and filling the filling material 40 hydrated through the pouring port 31. 10 manufactures and lays simultaneously.

<1.1> Filling with filling material For example, when a slurry in which sand and water are mixed is pumped by a known sand pump, the other cylinder 31 is opened through the other opening 31 or when the cylinder body 30 has water permeability. It is drained to the outside through 30, and the filling material 40 is accumulated in the different rigid tube 20.

<1.2> Formation of the swelling portion The filling material 40 is accumulated not only in the cylinder body 30 but also in the closed bag 35 having flexibility.
Since the closed bag 35 is more easily deformed than the cylindrical body 30, when the filling material 40 is filled in the entire area of the closed bag 35, the closed bag 35 swells outward from the right end of the cylindrical main body 30 and has a tapered shape. A portion 36 is formed.
The bulging portion 36 has a substantially conical shape that is rounded as a whole.

<1.3> Closure of the inlet / outlet When the filling material 40 is filled in the entire region of the hard tube 20, the inlet / outlet 31 is closed, and the preceding coast has a uniform cross-sectional shape and a uniform height over the entire length. A maintenance structure 10A is obtained (FIGS. 2 and 5).

<2> Laying operation of the following coastal protection structure 10B The following beach maintenance structure 10B is laid adjacent to the preceding coastal maintenance structure 10A through the work described in detail below.

<2.1> Filling with Filling Material As shown in FIG. 3, the left end of the following different hard tube 20 is disposed facing the bulging portion 36 side of the preceding coastal maintenance structure 10 </ b> A.
In the state where the left end of the cylinder main body 30 for the trailing is abutted with the right end of the cylinder main body 30 constituting the preceding coastal protection structure 10 </ b> A, The filling material 40 is filled.
As described above, the drainage is performed when the filling material 40 is filled.

<2.2> Formation of receiving portion and bulging portion With the filling of the filling material 40, the different-strength tube 20 for the rear is closed to the inner side of the cylindrical body 30 with a closed bag 35 at the left end. While forming the receiving part 37, the closing bag 35 of the right end swells out of the cylinder main body 30, and forms the bulging part 36. FIG.
The receiving portion 37 of the following different rigid tube 20 is formed in a shape that matches the shape of the bulging portion 36 protruding from the right end of the preceding coastal protection structure 10A.
Even if the bulging portion 36 has a slightly distorted shape, the receiving portion 37 is formed into a shape corresponding to the bulging portion 36 due to the flexibility of the closing bag 35, so that the bulging portion 36 and the receiving portion 37 are Adhering to each other, there is no gap between them.

<2.3> Dimensional Relationship of Joint Portion In FIG. 4, the bulging portion 36 and the bulging portion 36 have the same axial length L from the opening end portion of the cylinder body 30.
When the height of the tube body 30 is H, if the axial length L of the bulging portion 36 and the bulging portion 36 is shorter than the height H of the tube body 30, the shearing force of the joint portion becomes small and the different rigid tube There is a difficulty that the joint strength equivalent to 20 main bodies cannot be obtained.
Therefore, it is desirable that the protruding length L of the closing bag 35 and the height H of the cylinder body 30 have a dimensional relationship of L ≧ H.

<2.4> Closing the pouring port When the filling material 40 is filled in the entire region of the different rigid tube 20, the pouring port 31 is closed, and the following line has a uniform cross-sectional shape and a uniform height over the entire length. The coastal protection structure 10B is obtained (FIG. 4).

In addition, when sealing the filling material 40, if there is a possibility that the joint part is separated, it is preferable to temporarily fix the space between the two cylinder main bodies 30, 30 with a simple stopper.
This temporary fixing is not indispensable, and the separation of the following different hard tube 20 can be suppressed by adjusting the filling speed of the filling material 40 and the pouring position of the slurry.

  Further, when an openable inspection window (not shown) for density test of the consolidated material 40 is provided in a part of the cylinder main body 30 constituting the coastal maintenance structures 10A and 10B, the coastal maintenance structure 10A. , 10B can be accurately managed in the density of the consolidated material 40.

<3> Extension of Coastal Conservation Structure By repeating the above-described operation on the existing coastal protection structure 10, a plurality of coastal protection structures 10 are laid and extended along the coastline.

At the joint portions of the coastal protection structures 10A and 10B after laying, the receiving portion 37 and the bulging portion 36 that are fitted to each other are stored inside the cylinder main body 30 constituting each of the coastal protection structures 10A and 10B. Therefore, it is possible to lay the cylinder body 30 with the end openings of the cylinder bodies 30 and 30 in contact with each other.
Therefore, no gaps or steps are formed at the joints between the adjacent coastal conservation structures 10A and 10B, and the gap can be laid with continuity without changing the cross-sectional shape and filling height. As a result, the coastal sand flow-out prevention effect and the erosion prevention effect that occur as a result are remarkably improved, and further, accidents of falling people and vehicles at the joints can be prevented and the safety of the coastal protection structure 10 is increased.

<4> End treatment of the outermost coastal protection structure The bulging portion 36 is located at the outermost end of the arranged coastal conservation structures 10.
The bulging portion 36 at the outermost end may be left as it is, but is covered with earth or sand, or the bulging portion 36 is covered with an extended portion obtained by extending the end material of the cylinder body 30 and flattened. It is good to sew the extension part.

<5> About the laying form of a coastal maintenance structure In addition to the case where a plurality of coastal maintenance structures 10 are laid in a row with mutual continuity, two or more rows may be laid in parallel.
Further, a plurality of coastal conservation structures 10 may be stacked in the height direction.

<6> About the joint strength of the joint part of a coastal maintenance structure The joint strength of the joint part of the coastal maintenance structures 10A and 10B will be described based on FIG.
In this invention, the joint strength (shearing force) in the junction part of both coastal maintenance structure 10A, 10B increases markedly by using the different rigid tube 20 which combined the raw material from which hardness differs.
The reason will be described in detail below.

<6.1> Uniform transmission of force at the joint When the relationship between the left and right filling materials 40 at the joint is described, the left and right filling materials 40 are insulated by the two closed bags 35, 35. Because of the flexibility of the closing bag 35, the entire circumferential surfaces are in contact with each other, so that the force can be transmitted evenly.
That is, even if an external force is applied to the joint portion, the two closing bags 35, 35 are continuously applied with equal force (earth pressure) from both the left and right sides, and the balance of the force is maintained. Unbiased force is not applied. Therefore, it is possible to transmit force between the left and right filling materials 40 at the joint as if there are no two closed bags 35, 35.

<6.2> Restraint effect of filling material The filling material 40 filled in the entire region of each hard tube 20 is originally housed in a compacted state, and particularly when an external force is applied, it is a hard, non-expandable tube body 30. Strength is increased due to the restraining effect.
Since the restraining effect of the cylinder body 30 is similarly applied to the left and right filling materials 40 at the joint portion, the integral structure of the left and right filling materials 40 becomes stronger.

  More specifically, although the adjacent cylinder main bodies 30 and 30 are separated from each other, the two closing bags 35 and 35 located at the joint portion are restrained from the inside. It is because it will be in the same state as the state restrained with the cylinder main body 30 which has one continuity.

The above-described enhancement effect of the joint portion can be obtained for the first time by using the different rigid tube 20 in which materials having different hardnesses are combined.
For example, when the closed bag 35 is a non-deformable hard member made of metal or concrete, the effect of enhancing the joint as described above cannot be obtained.

<6.3> Synergistic effect When an external force is applied, the uniform transmission of the force at the joint and the restraining effect of the filling material 40 by the different rigid tube 20 are generated synergistically.
Therefore, even if an external force such as a wave is applied to the joint between the two coastal protection structures 10A and 10B, force can be transmitted and distributed to the surroundings through the bulging part 36 and the receiving part 37, and the joint is a weak point. In other words, it is possible to effectively avoid the deformation and separation of the joint portion.

  In this way, by laying the coastal maintenance structure 10 using the different rigid tubes 20 formed of materials having different hardnesses, the joint portions of both the coastal maintenance structures 10A and 10B can be firmly joined. There is no need to additionally provide connection means such as connection metal fittings or rope material between the matching coastal protection structures 10A and 10B.

<7> Other Effects of Coastal Conservation Structure The coastal conservation structure 10 receives wave pressure (wave power) by its own weight and prevents erosion of the coastline.
When wave pressure (wave force) acts on the surface of the coastal protection structure 10, not only does the pile 34 group elastically deform and effectively attenuate the wave pressure (wave force), but also a large number of dense piles 34. Captures the drifting sand. Furthermore, the dense pile 34 suppresses the sand on the land side from flowing out to the sea side.
Since the trapped sand enters the root of the pile 34 to form a protective layer, it helps to improve the durability of the coastal protection structure 10.

[How to remove the coastal protection structure]
When the position of the coastal protection structure 10 is changed or when the laying purpose is achieved, the coastal protection structure 10 needs to be removed. With reference to FIG. 6, the removal method of the coastal maintenance structure 10 is demonstrated.

<1> Opening operation of the closed bag The bulging portion 36 at the end of the succeeding coastal protection structure 10B located at the outermost end is exposed.
An opening is provided by cutting a part of the closed bag 35 covering the exposed surface of the bulging portion 36 with a cutter or the like.

<2> Discharging Work for Filling Material All the filling material 40 cannot be discharged just by providing an opening in a part of the closed bag 35.
Therefore, water is forcibly injected into the different rigid tube 20 through the pouring / discharging port 31, and the filling material 40 is slurried and discharged to the outside.

<3> Removal operation of differently hard tube When the removal of the filling material 40 is completed, the differently hard tube 20 is removed.
The dissimilar hard tube 20 that has finished taking out the filling material 40 is light in weight, and thus can be easily removed.

<4> Repeat of work When the trailing coastal maintenance structure 10B is removed, the bulging portion 36 at the end of the preceding coastal maintenance structure 10B is exposed.
The coastal protection structure 10 is sequentially removed while repeating the opening operation of the closing bag 35, the discharging operation of the filling material 40, and the removal operation of the different rigid tube 20 with the exposed bulging portion 36 as a target.

<5> Reuse of Different Rigid Tube The removed different rigid tube 20 has only one closed bag 35 opened, and the other closed bag 35 can be recovered in a healthy state without being opened.
Accordingly, the opening of the closed bag 35 is closed and restored by sewing or the like, so that it can be reused as the different rigid tube 20.

  In addition, if a known opening-and-closing fastener is previously provided in a part of the closing bag 35, the closing bag 35 can be easily opened and closed.

[Example 2]
Other embodiments will be described below. In the description, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the previous embodiment, the configuration in which a plurality of coastal conservation structures 10 are extended and laid in one direction has been described. However, as shown in FIG. 7, the coastal conservation structures 10 are laid in two directions at both ends. May be.
Also in this example, the same hard tube 20 as in Example 1 formed by closing both end openings of the cylinder body 30 with the closing bag 35 is used.

In this example, after laying the preceding coastal conservation structure 10A having the bulging portions 36, 36 at both ends, the subsequent coastal conservation structure 10B is sequentially applied to the left and right sides of the preceding coastal conservation structure 10A. Lay adjacent.
Compared with the first embodiment in which the coastal maintenance structure 10 is laid in one direction, in this example, the laying work can be performed in parallel in both the left and right directions, so that the construction efficiency is improved.
Similarly, the coastal protection structure 10 can be removed in a short time.

[Example 3]
In the above embodiment, the configuration in which the coastal conservation structure 10 is laid on the coastline has been described. However, the coastal conservation structure 10 may be submerged and used as a wave structure such as a submerged dike.

10. Coastal protection structure 10A ... Leading coastal protection structure 10B ... Trailing coastal protection structure 20 ... Hard tube 30 ... Cylinder body 31 ································································································································································································· · Closure bag 36 ··· swelling portion 37 ··· receiving portion 40 · · · filling material

Claims (8)

It is a different rigid tube for coastal protection structure that encloses filling material,
A tube-shaped tube body with both ends open;
A plurality of outlets provided in a part of the cylinder main body so that the inside of the cylinder main body can be filled with the filling material;
A closed bag attached to at least one end opening of the cylinder body,
The tube body and the closed bag are formed of different materials having different hardness, and the closed bag is formed of a soft material compared to the flexible tube body,
Different rigid tube.   2. The hetero-hard tube according to claim 1, wherein the tube body is made of an abrasion-resistant sheet formed by integrally planting a plurality of pile groups on a surface of a hard base.   3. The hetero-rigid tube according to claim 1, wherein end openings at both ends of the cylinder main body are closed by the closing bag. It is a joint structure of a coastal conservation structure in which the closed ends of a plurality of coastal conservation structures manufactured by enclosing the filling material in the field with a bag closed at both ends are laid adjacent to each other,
Using the different rigid tube according to any one of claims 1 to 3 as the bag,
Fill the different rigid tube for the preceding coastal maintenance structure with the filling material and bulge the closed bag from the end of the cylinder body to form the bulging part,
Filling the different rigid tube for the following coastal protection structure with a filling material in a state where one end of the different rigid tube for the subsequent coastal conservation structure is butted against the different rigid tube for the preceding coastal conservation structure And forming a receiving portion by closely attaching a closed bag to the bulging portion,
In a state where the bulging portion is accommodated in the receiving portion, the end portions of both cylinder main bodies constituting the different rigid tubes for the preceding and succeeding coastal protection structures are abutted,
The bulging part and the receiving part are constrained by the two cylinder main bodies,
Joint structure of coastal conservation structure. A method for laying a coastal conservation structure in which a shore conservation structure is manufactured by enclosing a filling material in a bag body closed at both ends and laying closed end portions of a plurality of coastal conservation structures adjacent to each other. ,
Using the different rigid tube according to any one of claims 1 to 3 as the bag,
Filling the different rigid tube for the preceding coastal protection structure with the filling material to produce the preceding coastal protection structure,
In the state where one end of the cylinder main body constituting the different rigid tube for the following coastal protection structure is abutted with the other end of the cylinder main body constituting the different rigid tube for the preceding coastal maintenance structure, the subsequent coastal maintenance is performed. Filling the different rigid tube for the structure with the filling material to produce the following coastal conservation structure,
Forming the bulging part in advance by inflating the closed bag from the end of the cylinder body constituting the different rigid tube for the preceding coastal maintenance structure,
Along the bulging portion, a closing bag forming a different rigid tube for the following coastal protection structure is adhered to form a receiving portion,
In the state where the bulging portion is accommodated in the receiving portion, the end portions of both cylinder main bodies constituting the different rigid tubes for the preceding and succeeding coastal maintenance structures are abutted,
How to lay coastal protection structures.   The method for laying a coastal conservation structure according to claim 5, wherein the plurality of coastal conservation structures are laid in one extending direction.   6. The shore conservation structure laying method according to claim 5, wherein a plurality of shore conservation structures are laid in the extending direction of both ends of the preceding shore conservation structure. A method for removing a coastal protection structure laid by the laying method according to any one of claims 5 to 7,
Forming an opening in a portion of the exposed bulging portion of the end portion of the succeeding coastal protection structure located at the end;
Discharging the filling material slurried by pouring water into the downstream coastal protection structure located at the end, and discharging through the opening;
It is characterized by repeatedly performing the process of removing the different hard tube from which the filling material is discharged,
Removal method of coastal conservation structure.

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