JPH10252036A - Unit for reflected wave reducing structure of breakwater, reflected wave reducing structure of breakwater, and method for constructing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflected wave reducing structure of a breakwater, which can be constructed through small-scale improving work that does not affect the requirements for stabilizing an existing breakwater, and a method for constructing the same. SOLUTION: In a reflected wave reducing structure 8, piles 11 are appropriately spaced apart from one another and placed to form a retarding chamber 10 in the sea in front of a breakwater 9 and between the breakwater 9 and the piles 11, and a perforated plate 12 is mounted on each pile 11 and placed upright. Above the surface of sea at the front of the breakwater 9, a support rod fixed at one end-extends horizontally toward the pile 11 and is connected at its end to the pile 11 or the perforated plate 12 to support them so that they do not collapse toward the breakwater 9. The perforated plate 12 has a perforated plate main body 14 formed by an approximately square plate-shaped member of the required thickness made of concrete and has thick-walled projecting parts 15 vertically formed at the rears of its right and left sides, and through holes 16 into which the piles 11 are inserted are provided vertically in the thick-walled projecting parts 15, and horizontally oblong holes are provided in eight positions at approximately the center of the front surface of the perforated plate main body 14 in such a way as to be spaced apart from one another in the longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a unit for a structure for reducing a reflected wave of a breakwater which can be easily attached to an existing breakwater, seawall, vertical pier, wave breakwater, quay, etc. (hereinafter referred to as "breakwater"). The present invention relates to a structure for reducing reflected waves of a breakwater and a method of constructing the structure.

[0002]

2. Description of the Related Art Conventionally, as a breakwater type breakwater, for example,
As disclosed in Japanese Unexamined Patent Publication No. Hei 8-232235, a water penetration chamber is formed at the front of a breakwater main body installed on the foundation of the seabed, and a large number of openings (light holes) are opened at the front. There was a breakwater-type breakwater whose wall was formed integrally with the breakwater. Further, as disclosed in JP-A-8-135219, in a pile-type pier structure, a large number of struts and wall members for wave-dissipating are combined in a lower part including a front part of a concrete superstructure, and 2. Description of the Related Art A water body structure having a retarding chamber is known. In addition, there were gravity type wave-breaking works (wave-breaking block, upright wave-breaking block, etc.).

[0003]

The prior art described above is
Both are technologies for constructing a new breakwater and a new jetty, not for improving the existing breakwater with a wave-breaking function. For this reason, in order to add a breakwater function to an existing breakwater by the conventional technology, it is necessary to extend a base mound or to improve a supporting ground in the case of soft ground, which is a technique which is very difficult to apply. In addition, the improvement work would affect the stability conditions of the existing breakwater. In addition, the gravity type wave breaker requires additional work such as widening of the foundation mound and additional improvement of the supporting ground, so that the construction takes many risks and affects the stability conditions of the existing breakwater due to the improvement work. there were.

[0004] The present invention is an improvement on the above-mentioned problems of the prior art, and an object of the present invention is to add a breakwater structure to an existing breakwater without affecting the stability conditions of the existing breakwater. An object of the present invention is to provide a unit for a reflected wave reduction structure of a breakwater, a structure for reducing a reflected wave of a breakwater, and a method of constructing the same, which enable an improvement work.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a method for driving a pile at a seabed position where an appropriate water gap is provided between the breakwater and a breakwater, and transmitting a part of an incident wave to reduce a reflected wave. A perforated plate body provided with a number of holes, and a perforated plate having a pile mounting portion provided on the perforated plate body, for mounting the perforated plate body to the pile, is inserted into the cast pile and submerged. One end of a support rod is fixed to an appropriate part of the breakwater, and the other end of the support rod is horizontally supported by the standing hole plate. It is characterized by being connected to. In the present invention, with the above-described configuration, the breakwater structure can be added without substantially affecting the existing breakwater and without any improvement.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a pier that is cast on the seabed in front of a breakwater, a perforated plate body provided with a number of holes for transmitting a part of incident waves and reducing reflected waves, A perforated plate provided on the perforated plate body for mounting the perforated plate body to the pile, and comprising a pile mounting portion; and provided between the breakwater and the perforated plate to horizontally support the perforated plate. And a support rod connected to the support rod. In the above, a steel pipe pile is used as the pile, and the steel pipe pile is driven in advance in the sea, and then the reflection wave reducing structure unit is submerged in the pile and the pile is inserted into the through hole thereof. Conversely, there is a method in which the structural unit is temporarily held in the sea by an appropriate temporary holding device (not shown), and then the steel pipe pile is driven into the seabed through a through hole. In any case, the gap between the steel pipe pile and the through hole is fixed by injecting a grout material such as mortar.

The perforated plate provided with a through hole for inserting a pile in a vertical direction is preferably configured as a prefab unit manufactured in a factory. Lowering the perforated plate lifted by a crane into the sea, inserting the previously cast pile into the through hole to support the perforated plate standing upright, pouring grout such as mortar or concrete into the gap between the pile and the through hole. The pile and the perforated plate may be fixed integrally.

[0008] The present invention is also directed to a method for installing the reflected wave reducing structure unit and a breakwater at a seabed position where an appropriate water gap can be obtained, and inserting the reflected wave reducing structure unit into the through hole of the structure unit. And a supporting rod that fixes one end to an appropriate portion of the breakwater and supports and fixes the structural unit at the other end, and a number of the structural units are adjacent to each other along the breakwater. This realizes a structure to reduce the reflected waves of a standing breakwater.

[0009] Further, the present invention provides a pile driving step of driving a pile along the breakwater at a predetermined interval while keeping an appropriate water separation interval between the breakwater and the sea in front of the breakwater,
A plurality of holes for transmitting a part of the incident wave to reduce the reflected wave are provided, and the hole is formed by inserting the stake into the through hole of a hole plate having a unit configuration having a vertical through hole. A reflected wave of a breakwater, comprising: an erecting step of erecting a board; and a supporting step of fixing one end of a support rod to an appropriate portion of the breakwater and connecting the other end to the perforated plate or the pile. Realize the construction method of reduced structure.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an installation place of a reflected wave prevention structure behind a general breakwater in a harbor. Since the breakwater 5 at the entrance of the port protrudes into the open sea, it tends to receive waves from the open sea depending on the wind direction, and a reflected wave of a wave that collides with the back side (route side) of the breakwater is likely to be generated. Also,
The breakwater 5a and the quay 7 in the extension direction of the port opening may also generate reflected waves due to incident waves from the open sea. If the reflected wave is large, the calmness of the port cannot be maintained, which hinders the navigation of the ship. Therefore, it is necessary to suppress the reflected wave in these places. The reflected wave reduction structure 1 behind the breakwater is installed on the existing breakwater 5, and the quay 7 located between the existing breakwater 5 and the other existing breakwater 6 is provided with a breakwater reflected wave reduction structure 2 and a seawall reflected wave reduction structure 3. A vertical pier reflected wave reduction structure 4 and the like are provided. Next, as an embodiment of the present invention, FIGS.
The reflected wave reduction structure 8 of the breakwater shown in FIG. 11 has a structure in which the piles 11 and 11 are provided at appropriate intervals in the sea in front of the breakwater 9 so as to form an appropriate water chamber 10 between the breakwater 9 and the breakwater 9. And a hole plate 12
Is installed vertically. In addition, a support rod, one end of which is fixed above the sea surface in front of the breakwater 9, extends horizontally toward the pile 11 and hits the upper part of the pile 11, and the standing pile 11 and the perforated plate 12 fall down to the breakwater 9 side. It is a structure that is connected and supported so that it does not exist.

As shown in FIG. 2 and FIG.
Has a perforated plate main body 14 made of a thick plate-shaped member made of reinforced concrete, and has thick projecting portions 15, 15 formed on the left and right rear portions of the perforated plate main body 14.
Through holes 16, 16 for inserting the stake 11 into 15 are provided in the vertical direction (up and down direction). At the approximate center of the perforated plate body 14 as viewed from the front, eight horizontally long holes 17 are provided at intervals in the vertical direction. Also, the perforated plate body 14
Are provided on both sides of the hole at the same interval as the holes 17. When a large number of perforated plates 12 are arranged side by side to construct a long breakwater, the holes 18 face each other.
9 (shown in FIG. 11). FIG.
In FIG. 6 and FIG.
The main reinforcing bar 20 is 300 mm in the vertical direction all around 0 mm
It is stretched at intervals, and the lateral force distribution bar 21 is 250 mm
The main reinforcing bars 20 and the distribution bars 21 form a mesh as a whole. The pile 11 is made of steel pipe, and has a surface subjected to a corrosion prevention treatment 29. Pile 11
May be filled with grout such as mortar in advance, may be filled with grout after casting, or may be used in a tubular state. When grout or the like is filled in advance, there is a case where it is filled and transported at a factory, and a case where it is filled and used locally. Further, a grout material 30 such as mortar is filled and fixed in a gap between the pile 11 and the through hole 16. 7 and 8, a support rod 13 acting as a horizontal member is provided with an arc-shaped concave curved portion 23 at the front of a support rod main body 22 made of a steel pipe or a rod-shaped member so as not to be displaced from the pile 11. 11, a connecting member 24 fixed to the stake 11 by welding and supported as a whole in a supporting surface is provided.
Is provided with a shear key 25 buried in a breakwater or seawall concrete to prevent slipping. Further, the connecting member 24 and the support rod body 2
The connection member 2 is connected so that when a strong force is applied by the bolt 26, the connection member 24 rotates up and down to release the load. When connecting the connecting member 24 to the perforated plate 12, the connecting member 24 is a face plate having a bolt insertion hole, and the other perforated plate 12 is appropriately filled with a mounting plate or an insert having a female screw hole or a bolt insertion hole. If it is fixed in place, the face plate and the attached plate or insert can be connected and fixed appropriately by bolts or the like. FIG.
And a lid 27 attached to the head of the pile 11 in FIG.
Has a configuration in which a lattice-shaped beam 28 is provided on the inside to prevent deformation of the head.

[0011]

The present invention is embodied in the form described above and has the following effects.

The reflected wave reducing structure of the present invention is independent of the breakwater (seawall) main body, that is, a perforated plate having a unit configuration is installed prior to its installation in the sea, or it is installed on the seabed later. Since the structure and the construction method are to be attached to and supported by the driven piles, construction can be carried out with improved construction that hardly affects the stability conditions of the existing breakwater, and the construction period can be significantly reduced as compared with the conventional construction method. Further, the structure of the reflected wave reduction structure of the present invention can reduce the occupied area,
The waterway in front of the ship or at the anchorage of the ship can be reduced.

[0013] In addition, by forming the perforated plate, which is one of the main elements of the present invention, into a prefabricated unit manufactured at a factory, the main work is the driving of piles on site, and the construction period on site is shortened. Therefore, it is possible to lessen the hindrance of sharing the existing breakwater regardless of the construction content and the construction period.

[Brief description of the drawings]

FIG. 1 is a port plan view shown as an example of a place where the present invention is implemented.

FIG. 2 is a plan view of a perforated plate.

FIG. 3 is a front view showing a state where a perforated plate is attached to a pile.

FIG. 4 is a side view showing a structure for reducing reflected waves of a breakwater.

FIG. 5 is an enlarged cross-sectional view of the left half of line CC in FIG.

FIG. 6 is a longitudinal sectional view taken along the line AA of FIG. 5 showing a reinforcing plate arrangement state of the perforated plate.

FIG. 7 is a side view of a support rod.

FIG. 8 is a plan view of a support rod.

FIG. 9 is a front vertical sectional view showing the connection between the lid and the pile.

FIG. 10 is a sectional view taken along line DD of FIG. 9;

FIG. 11 is an explanatory front view showing a structure for reducing reflected waves of a breakwater adjacent to and alongside a breakwater along a breakwater;

[Explanation of symbols]

 1-Reflection wave reduction structure behind breakwater 2-Breakwater reflection wave reduction structure 3-Seawall reflection wave reduction structure 4-Vertical pier reflection wave reduction structure 5-Existing breakwater 6-Existing breakwater 7-Quay 8 --- Reflection wave reduction structure of breakwater 9-Breakwater 10-Reservoir room 11-Pile 12-Perforated plate 13-Support rod 14-Perforated plate body 15-Thick projection 16-Through hole 17 --Hole 18--Concave and concave portions 19--Hole 20--Main rebar 21-Force distribution bars 22--Support rod body 23--Concave curved portion 24--Connection member 25--Shea key 26--Bolt 27- -Lid 28--Beam 29--Corrosion-proof treatment

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[Procedure amendment]

[Submission date] May 12, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Added

[Correction contents]

FIG. 11

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kunihiro Yamamoto 2-6-3 Otemachi, Chiyoda-ku, Tokyo New Nippon Steel Corporation (72) Inventor Hiroaki Kazeno 2-6-Otemachi, Chiyoda-ku, Tokyo No. 3 inside Nippon Steel Corporation

Claims (4)

[Claims] 1. A pile to be cast on the seabed in front of a breakwater; a perforated plate body provided with a large number of holes for transmitting a part of an incident wave to reduce reflected waves; A perforated plate comprising a pile mounting portion provided on the perforated plate main body for mounting on the perforated plate body; and a support rod disposed between the breakwater and the perforated plate for horizontally supporting the perforated plate, and connected thereto. A unit for the structure to reduce reflected waves of a breakwater. 2. The unit according to claim 1, wherein the perforated plate is provided with a through hole for inserting a pile, and the perforated plate is configured as a prefab unit. 3. A unit for a reflected wave reducing structure according to claim 1, which is installed at a seabed position where a water separation interval is obtained between the unit and a breakwater, and is inserted into the through hole of the unit for a structure. And a support rod fixing one end to an appropriate portion of the breakwater and supporting the structural unit at the other end, and a large number of the structural units are standing adjacent to each other along the breakwater. The structure to reduce the reflected waves of the breakwater that has been set up. 4. A pile driving step in which a pile is driven along the breakwater in the sea in front of the breakwater while maintaining a proper water-repellent interval between the breakwater and the breakwater, A large number of holes are provided for transmitting reflected light to reduce reflected waves, and a hole plate having a unit configuration having a through hole of a pile is inserted into the through hole to erect the hole plate. An erecting step, a step of filling the gap between the through-hole and the pile with a grout material, and fixing one end of a support rod to an appropriate portion of the breakwater, and connecting the other end to the hole plate or the pile. Construction method of the structure to reduce the reflected wave of the breakwater, which consists of the board support process.