JPH11350446A - Composite main pile for wave absorbing structure and wave absorbing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate corrosion and abrasion of a pile and increase the strength of the pile itself to further improve dynamic stability, dispense with or reduce an intermediate pile, dispense with wave dissipating work, and economically construct an expected wave absorbing structure. SOLUTION: This wave absorbing structure is provided with steel piles 5 driven in a water bottom ground G and vertically erected, and abrasion resistant covered pipes 6 such as prestressed concrete pipes fitted onto the steel piles 5, are driven in the water bottom ground G and vertically erected, and cavities formed between these steel piles 5 and the abrasion resistant covered pipes 6 are filled with filler such as gravel and concrete. The composite main piles are used to construct the wave absorbing structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wave breaking structure and its composite main pile.

[0002]

2. Description of the Related Art A wave-absorbing structure formed by randomly stacking wave-absorbing materials such as stones or concrete blocks in an air space surrounded by a plurality of piles erected at required intervals on a water bottom ground, for example, as shown in FIG. As shown in FIG. 10, a plurality of piles 1 (main piles and intermediate piles) are erected vertically and horizontally at a required interval on the underwater ground, and stone or concrete blocks or the like are placed in the air space surrounded by the piles 1. The wave-breaking structure in which the corrugated material 2 is randomly piled up, the superstructure 3 is constructed on the upper end of the pile 1 and, if necessary, the wave-breaking construction 4 is constructed on the offshore side is disclosed in JP-B-62-37168.
For example, it is known in the art, such as described in Japanese Patent Application Publication No. H10-163, and it is said that it has a mechanically very stable structure.

[0003]

However, steel piles such as H-section steel used as the pile 1 are highly corroded in the area where dry and wet are repeated. It is as large as 3 mm / year. For this reason, various anticorrosion methods have been proposed, but all have the common drawbacks of having advantages and disadvantages, high construction costs, and difficulty in construction.

[0004] Furthermore, wear damage is caused to the steel pile due to repeated collisions of strong waves including seabed gravel. Wave-dissipating works installed offshore of the wave-dissipating structure (see FIG. 10) can greatly reduce the wave force, and are effective as a measure against the above-mentioned wear damage. However, there is a disadvantage in that the construction cost is increased.

It is an object of the present invention to firstly eliminate the above-mentioned drawbacks, namely, corrosion and wear of the pile, and secondly, to further increase the mechanical stability of the wave breaking structure by increasing the strength of the pile itself. Thirdly, by eliminating or eliminating the need for conventional intermediate piles, or by eliminating the necessity of installing wave breakers, the desired wave breaker can be constructed economically. And so on.

[0006]

According to the present invention, a composite main pile a for a wave-breaking structure according to the present invention is provided with a steel pile 5 which is driven into a submerged ground G and which stands upright. Abrasion-resistant cladding 6, such as a prestressed concrete pipe, which is cast into the ground G and stands upright, and a gap formed between the steel pile 5 and the abrasion-resistant cladding 6, a gravel 7, concrete 8
And the like.

In the above, the steel pile 5 has its required length of head end 5 'protruding from the water surface W, and the wear-resistant covering tube 6 has its required length of head end 6' extending from the water surface W. Project from
Moreover, gravel 7 is filled in the gap formed between the steel pile 5 and the wear-resistant cladding 6 and a portion from the bottom G to a position slightly below the water surface W. Filling concrete 8 into a portion located above and on the gravel 7, more specifically, a steel pile 5 and a wear-resistant sheath pipe 6.
It is recognized that it is preferable to align the centers of the steel piles 5 and extend the head end 5 ′ of the steel pile 5 further upward from the head end 6 ′ of the wear-resistant cladding 6.

In the wave-breaking structure of the present invention, a large number of the composite main piles a are erected at required intervals on the underwater ground G, and the water surface is passed through the head end 6 ′ of the wear-resistant covering pipe 6 of the composite main pile a. The head ends 5 'of the steel piles 5 protruding from the W are connected by a plurality of connecting steel materials 9, and a wave absorber 10 such as a stone material or a concrete block is placed in an air space surrounded by the large number of composite main piles a. And the upper lining 11 in which the head end portion 5 'of the steel pile 5 and the connecting steel material 9 are buried is constructed.

[0009] The installation of a rock-filling work e, which is obtained by randomly stacking the wave-damping material 13 on the lattice-like laying frame f formed of the steel material 12, is installed on the underwater ground around the wave-damping structure. This is desirable because it can prevent collapse due to scouring of a.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show a composite main pile a according to an embodiment of the present invention. Reference numeral 5 denotes a steel pile, which is an H-section steel, which is driven into the underground ground G by an appropriate means, and stands upright with a required length of the head end 5 ′ protruding upward from the water surface W. ing. 6 is Prestressed Concrete
(lessened concrete) tube, prestressed
High Stress Concrete
High strength Concrete (P
HC)) A wear-resistant sheath tube such as a tube. When fitted to the steel pile 5, the wear-resistant cladding 6 is cast into the underwater ground G by a suitable means in the same manner as the steel pile 5, and the head end 6 'of a required length is placed on the water surface. It stands upright with it protruding upward from W.

The center of each of the steel pile 5 and the wear-resistant cladding 6 coincides with each other, and the head end 5 ′ of the steel pile 5 is further higher than the head end 6 ′ of the wear-resistant cladding 6. Has been extended to.

Reference numeral 7 denotes a gap formed between the steel pile 5 and the wear-resistant cladding 6, and the gravel filled in a portion from the bottom G to a position slightly below the water surface W. It is. Numeral 8 is concrete filled in the above-mentioned space and a portion located above the gravel 7.

As is clear from the above configuration, the steel pile 5
It is buried in gravel 7 and concrete 8 and fitted with abrasion-resistant cladding 6 and is not directly affected by wet and dry action and is not directly affected by waves, so it corrodes. Of course there is no wear.

Since the composite main pile a is literally a composite composed of a steel pile 5 and a wear-resistant cladding 6 and a filler such as gravel 7 and concrete 8 filled between them, a conventional composite pile is generally used. It is apparent that the mechanical strength of the pile is increased as compared with the case of the steel pile alone.

4 to 8 show a wave-absorbing structure b according to an embodiment of the present invention. In this wave-absorbing structure b, a large number of composite main piles a having the above configuration are erected at required intervals (appropriate intervals at which the wave-absorbing material does not come off) on the underwater ground G, and the head of the composite main pile a More specifically, the head ends 5 ′ of the steel piles 5 protruding outward from the water surface W through the head ends 6 ′ of the wear-resistant covering pipes 6 are connected by a plurality of connecting steel materials 9.

Thereafter, a wave-damping material 10 such as a stone or concrete block is charged and stacked in the air space surrounded by the large number of composite main piles a. The upper lining 11 in which the 5 'and the connecting steel 9 are buried is constructed to complete the wave-absorbing structure b.

In this wave breaking structure b, the composite main pile a
Since the outer diameter is increased by the amount of the abrasion-resistant cladding 6 as compared with the case where the steel pile is used alone as in the conventional case, the steel pile alone is used when standing at the same pile center distance. The composite main pile a makes the gap between adjacent piles smaller than that of the composite main pile a. Therefore, even if a wave absorber having a smaller diameter is used, the wave absorber is not pulled out from the gap, and the conventional intermediate piles can be made unnecessary or at least the number thereof can be reduced.

The steel pile 5 constituting the composite main pile a is not directly subjected to the wet and dry action and does not receive the direct wave contact, and there is no danger of corrosion or wear.
Since the rigidity of the structure is greater than that of the steel pile 5 alone, the mechanical strength of the entire wave breaking structure b is also increased, and the durability is enhanced. Therefore, as in the prior art, in order to reduce the wave force and prevent wear damage of the pile, the wave breaking structure b
The uneconomical cost of constructing and installing a wave breaker 4 off the coast can be improved.

FIG. 9 shows a wave-absorbing structure c according to another embodiment of the present invention. This wave-absorbing structure c is constructed by the fact that the existing upright seawall d receives the strong wave force directly.
It was constructed and installed to improve the possibility of destroying the revetment itself and giving large vibrations to nearby houses and the like.

That is, the wave-absorbing structure c is constructed and installed on the front surface of the upright seawall d in the same manner as in the case of the above-described wave-absorbing structure b, and furthermore, a consolidation work e is constructed and installed on the front surface thereof. In this deepening work e, a plurality of steel materials 12 are arranged vertically and horizontally to form a grid, and a laying frame f is laid on the offshore underground of the wave-dissipating structure c, and escapes from the grid on it. A wave absorber 13 such as a stone or a concrete block having a size to be engaged with the wave absorber 13 is randomly stacked.

[0021] The root consolidation work e prevents the composite main pile a of the wave breaking structure c from being collapsed by scouring.

[0022]

As is apparent from the above description,
The composite main pile for wave-breaking structure of the present invention fits a wear-resistant cladding into a steel pile that is driven vertically to the bottom of the water floor and stands upright. The piles are filled with gravel, concrete, etc., so the steel piles are not directly affected by the wet and dry action and are not directly affected by the waves, so they do not corrode and wear. Not even.

Further, since the composite main pile is literally a composite composed of a steel pile, an abrasion-resistant cladding, and a filler filled therebetween, compared with a conventional steel pile alone, It is clear that the mechanical strength of the pile has been improved.

In the wave breaking structure according to the present invention, the composite main pile having the above-described structure has an outer diameter increased by the amount of the abrasion-resistant cladding compared to the conventional case where a steel pile is used alone. When standing at the same pile center distance, the composite main pile reduces the gap between adjacent piles as compared to using steel piles alone, so even if a smaller diameter wave absorber is used, It does not come out of the gap and eliminates the need for the conventional intermediate piles or at least reduces the number of them, and the economic merit is extremely large.

Since the steel piles constituting the composite main pile are not directly subjected to the wet and dry action or subjected to the impact of waves, there is no danger of corrosion or wear, and the rigidity of the composite main pile is low. Since it is larger than the steel pile alone, the mechanical strength of the whole wave-breaking structure also increases, and it is rich in durability. Can be eliminated.

The composite main pile of the wave-dissipating structure is washed by constructing and laying a pile of the wave-dissipating material in a grid-like laying frame around the offshore side of the wave-dissipating structure. Since the collapse due to excavation can be prevented, the durability of the wave-breaking structure of the present invention when combined with the consolidation work is further improved.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of a composite main pile according to the present invention in a state where a submarine ground is standing.

FIG. 2 is an enlarged cross-sectional view of the same.

FIG. 3 is an enlarged sectional view of a main part of the above.

FIG. 4 is a schematic front view of an embodiment of the wave-breaking structure of the present invention.

FIG. 5 is a schematic side view of the same.

FIG. 6 is a plan view of the wave-breaking structure of FIG. 4 before upper lining.

FIG. 7 is an enlarged view of a main part of FIG.

FIG. 8 is an enlarged view of a main part of FIG. 6;

FIG. 9 is a schematic side view of another embodiment of the wave-breaking structure of the present invention.

FIG. 10 is a side view of a conventionally known wave-absorbing structure.

[Explanation of symbols]

 a Composite main pile for wave-breaking structure of the present invention b, c Wave-breaking structure of the present invention e Rooting work f Laying frame 5 Steel pile 5 'Head end of steel pile 6 Wear-resistant covering pipe 6' Wear-resistant covering Pipe head end 7 Gravel 8 Concrete 9 Connected steel 10 Wave absorber 11 Upper lining 12 Steel 13 Wave absorber

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[Procedure amendment]

[Submission date] June 12, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

In the wave-breaking structure of the present invention, a large number of the composite main piles a are erected at required intervals on the underwater ground G, and the water surface is passed through the head end 6 ′ of the wear-resistant covering pipe 6 of the composite main pile a. The head ends 5 'of the steel piles 5 protruding from the W are connected by a plurality of connecting steel materials 9, and a wave absorber 10 such as a stone material or a concrete block is placed in an air space surrounded by the large number of composite main piles a. Are piled up, and upper concrete (including reinforced concrete) is cast, and the upper lining 11 in which the head end 5 ′ of the steel pile 5 and the connecting steel material 9 are buried is constructed.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show a composite main pile a according to an embodiment of the present invention. Reference numeral 5 denotes a steel pile, which is an H-section steel, which is driven into the underground ground G by an appropriate means, and stands upright with a required length of the head end 5 ′ protruding upward from the water surface W. ing. 6 is Prestressed Concrete
(lessened concrete) tube, prestressed
High Strength Concrete (Prestress)
s High strength Concrete
(PHC)) It is a wear-resistant covering tube such as a tube. When fitted to the steel pile 5, the wear-resistant cladding 6 is cast into the underwater ground G by a suitable means in the same manner as the steel pile 5, and the head end 6 'of a required length is placed on the water surface. It stands upright with it protruding upward from W.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

Thereafter, a wave-damping material 10 such as a stone or a concrete block is charged into the air space surrounded by the large number of composite main piles a, and at the same time, upper concrete (including reinforced concrete) is poured into the steel pile. The upper lining 11 in which the head end portion 5 'of 5 and the connecting steel material 9 are buried is constructed to complete the wave-absorbing structure b.

Claims (4)

[Claims] 1. Abrasion resistance of a vertically piled steel pile driven into the underwater ground and a vertically upright prestressed concrete pipe fitted into the steel pile and driven into the underwater ground. A composite main pile for a wave-breaking structure, characterized in that a cover tube and a gap formed between the steel pile and the wear-resistant cover tube are filled with a filler such as gravel or concrete. 2. The steel pile and the wear-resistant cladding are centered on each other, and the head end of the steel pile extends further upward from the head end of the wear-resistant cladding. Claim 1.
The composite main pile for a wave-dissipating structure as described in the above. 3. A plurality of composite main piles according to claim 1 or 2 are erected on the underwater ground at required intervals, and a plurality of head ends of steel piles projecting outward from the water surface of the composite main piles are provided. It is connected by the connecting steel material of this book, and the wave absorbing material such as stone or concrete block is put in the air space surrounded by a large number of composite main piles, and at the same time, the upper concrete is cast and the head end of the steel pile is A wave-breaking structure characterized by being constructed with an upper lining with embedded steel. 4. A wave-breaking structure according to claim 3, wherein a root-fixing work made by randomly stacking the wave-breaking material on a grid-like laying frame made of steel is installed on the surrounding underwater ground. Stuff.