JP3585037B2 - Stationary double curtain wall type breakwater and its construction method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stationary double curtain wall type breakwater constructed on a shoreline or the like and a method of constructing the breakwater.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a breakwater constructed on a shoreline or the like employs a levee construction method in which a plurality of deformed wave-dissipating blocks are stacked under conditions where the water depth is shallow and the seabed ground is good. In the breakwater with the deformed breakwater, the stability of the breakwater against the wave force depends on the resistance force due to the weight of the deformed breakwater and the precast member and the slope angle of the constructed breakwater.
On the other hand, under the condition of the soft submarine ground, for example, as disclosed in Japanese Patent Application Laid-Open No. 2000-154518, they are arranged along piles that are driven in two rows on the offshore side and the land side of the submarine ground. Breakwaters with double curtain walls have been proposed.
[0003]
[Problems to be solved by the invention]
For breakwaters constructed by stacking deformed breakwater blocks, in order to improve the stability of the breakwaters, the slope of the breakwaters should be gentle and the weight of each deformed breakwater block should be increased. Therefore, a large amount of deformed wave-breaking blocks must be piled up, large cranes are required, and a lot of area is required to install breakwaters. Requires a lot of time and money.
[0004]
On the other hand, a fixed type double curtain wall type breakwater disclosed as a conventional example has a front curtain wall disposed on the sea side provided with an inclined plate having a blind type gap, and such a gap is provided. A floating body that has a closed front curtain wall without having it and is movable in the vertical direction is disclosed, but all of them are complicated in structure and there are many on-site work such as pile driving, so Requires a lot of time and money. Moreover, in the conventional breakwater, there was almost no one having a seawater exchange function in a sea area such as a harbor behind the breakwater.
[0005]
Therefore, an object of the present invention is to provide a stationary double curtain wall-type breakwater that is excellent in economical efficiency, is lightweight and durable, has sufficient wave-dissipating function and seawater exchange function, and a method of constructing the breakwater. .
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is configured as follows.
In the first invention, a front concrete column and a rear concrete column in which a connecting PC steel bar is buried are erected on a concrete bottom plate at an interval in front and rear, and a horizontal blind is provided on the front concrete column. A seaside front curtain wall member provided with a plurality of inclined plates arranged on the front side with a gap in a shape is provided, and on the back side of the rear concrete column, a lower end portion and a concrete bottom plate are provided. 2. A plurality of PC concrete plates arranged in the vertical direction, leaving a gap large enough to achieve a seawater exchange function in the sea area according to claim 1 , wherein said door is a door made of a light-transmitting plate between said doors. A rear curtain wall member provided with a vertical plate is provided, and a fixed double curtain wall breakwater is provided by integrating a top portion between the front curtain wall member and the rear curtain wall member with a concrete girder member. Concrete units are constructed, and wherein the stationary double curtain wall type wave dissipating Tsutsumi said concrete unit is seated on a foundation provided in the seabed by being lowered suspended from above at the installation site.
[0007]
According to a second aspect of the present invention, in the fixed type double curtain wall breakwater according to the first aspect, a reduction wall higher than the gap is provided on a concrete bottom plate in front of or behind the gap.
[0008]
A third invention is a method for constructing a fixed type double curtain wall breakwater, comprising: constructing a base on the seabed with rubble or the like; A front curtain having a front pillar provided with a plurality of inclined plates arranged on a front side with a gap in a horizontal blind shape, which is provided in advance at a factory or the like by installing a PC concrete bottom slab on which a wave reducing wall is erected. A wall member, and a back curtain member having a back support provided with a vertical plate arranged on the back side in a vertical direction leaving a gap only at the lower end portion, a through hole provided in the front and back support posts. After inserting the offshore and land side connected PC steel rods standing on the bottom slab respectively and fixing them by applying a pre-stress, the front and back side pillars are connected together by a girder member to form a unit. For double curtain wall breakwater To manufacture a down cleat unit, the fabricated double curtain wall type concrete units for wave dissipating crest, characterized in that continuously provided on the base.
[0009]
[Action]
In the present invention configured as described above, a front curtain wall including a front support having a plurality of inclined plates arranged on a front side with a gap in a horizontal blind shape at intervals on a concrete bottom slab. A member, a rear curtain wall member comprising a rear column provided on the rear side with vertical plates arranged in the vertical direction leaving a gap only at the lower end is erected, and between the top of the front side and the rear side column. A concrete unit for a double curtain wall breakwater, which is integrated by connecting with a girder member, is constructed in advance, and the concrete unit is hung down at an marine installation site and installed on the seabed foundation. Therefore, the construction is simple, the construction is particularly easy and the construction period can be shortened, and after installation, it is possible to realize a high breakwater performance and a durable breakwater even against fluctuations in water level due to ebb and flow. .

[0010]
Further, the interval between the lowermost inclined plate and the bottom plate of the front curtain wall member, the incident wave penetrating from the front curtain member passes through the gap of the rear curtain wall member, and the rear of the rear curtain wall member. The size is such that the seawater exchange function of the sea area can be exhibited, and by installing a wave reduction wall higher than the gap in front of or behind the gap, the incident wave is absorbed by overtopping the wave reduction wall, and its energy is absorbed, and the back side Maintain the calmness of the sea area behind the curtain wall member and enhance the seawater exchange function.
The structure of the breakwater with the front and rear double curtain wall members is effective against a wide range of wavelengths of waves, and in particular, has a wavelength of about 5 to 6 times the installation interval of the front and rear curtain wall members. Effective against waves. The wave is attenuated by using the wave resonance caused by the piston motion of the wave generated between the front and back side double curtain wall members, and a vortex is generated at the lower end of the inclined plate of the front curtain wall member. By promoting the energy consumption, transmitted and reflected waves can be efficiently attenuated.
Furthermore, workability by constructing a beam member for connecting the the front curtain wall member rear side curtain wall member in PC concrete member is further improved.
Also, on land, after assembling and manufacturing a double curtain wall type breakwater unit, a construction method of connecting the assembled double curtain wall breakwater unit on a foundation formed on the sea floor, The construction period can be greatly reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of the stationary double curtain wall type breakwater of the present invention as viewed from the sea side, and FIG. 2 is a cross-sectional view of the breakwater of the present invention.
As shown in FIG. 1 and FIG. 2, a stationary double curtain type breakwater installed on a shoreline or the like has a rubble excavation 2 as a base on the seabed ground on the coast. A concrete unit 1 for a stationary double curtain type breakwater constructed by a quay is installed on a foundation made of rubble stones 2. The concrete bottom plate 3 of the concrete unit 1 for the fixed type double curtain breakwater is preferably made of PC concrete. A rubble covering work 4 is constructed around the concrete bottom slab 3 of the concrete unit 1 and on the rubble work 2 to prevent scouring of the concrete bottom slab 3 by waves.
[0012]
On the concrete bottom slab 3, a seaside front curtain wall member 5 and a land side rear curtain member 6 are installed at a predetermined interval. The front curtain wall member 5 has an inclined plate 8 made of a plurality of PC concrete plates on a front (sea side) surface of a front concrete column 7 and is inclined downward toward the sea side with a gap in a horizontal blind form. Arrange so that. A predetermined gap is formed between the lowermost inclined plate 8 of the front curtain wall member 5 and the concrete bottom slab 3.
[0013]
In the back side curtain wall member 6, a vertical plate 10 composed of a plurality of PC concrete plates is arranged on the back side (land side) surface of the back side concrete pillar 9 without any gap in the vertical direction. A gap is formed between the vertical plate 10 at the lowermost end of the rear curtain wall member 6 and the concrete slab 3 such that the seawater exchange function in the sea area behind the rear curtain wall member can be achieved. You. A wave reducing wall 24 that is higher than the height of the gap is erected in front of or behind the gap.
[0014]
A concrete girder member 11 connects and connects the tops of the front concrete columns 7 of the front curtain wall member 5 and the rear concrete columns 9 of the rear curtain wall member 6. In this manner, the concrete unit 1 for the stationary double curtain type breakwater is continuously provided along the entire length of the breakwater installation location, and the fixed double curtain wall type breakwater is constructed.
[0015]
A method of constructing the concrete bottom slab 3 will be described with reference to FIG. A leveling concrete is cast and flattened, and a mold 12 for forming the bottom slab 3 is placed thereon. On the front side (sea side) and the back side (land side) of the formwork 12, a connecting PC steel rod 13 for connecting the lower end of the connecting PC steel rod 14 is attached. An anchor plate is attached to the lower end of the connecting PC steel bar 13, and a coupler for connecting the connecting PC steel bar 14 is installed to the upper end. In addition, a wave reducing wall 24 made of a PC concrete plate is installed in front of or behind the connecting PC steel bar on the back side. After connecting the connecting PC steel bar 14 to the coupler of the connecting steel bar 13, concrete is poured into the formwork 12 and the concrete bottom slab 3 is manufactured.
[0016]
The manufacturing method of the front curtain wall member 5 and the rear curtain wall member 6 will be described with reference to FIGS. FIG. 4 shows an inclined plate 8 and a vertical plate 10 made of PC concrete plates of the front curtain wall member 5 and the rear curtain wall member 6, and the front and rear concrete columns 7, 9 are provided on the back surface. The dowel 15 for integration with the projection is projected.
[0017]
The procedure for manufacturing the front curtain wall member 5 will be described with reference to FIGS.
The upper surface of the support 16 has a serrated step formed thereon, and the inclined plate 8 made of a PC concrete plate is placed on the serrated step of the support 16 so that the back surface of the dowel 15 protruding upwards. A reinforcing bar for forming the front concrete column 7 and a sheath for forming an insertion hole for inserting the connecting steel bar 14 are arranged, the formwork 17 is assembled, and concrete is poured. After the concrete is solidified, it is released and transported by crane.
[0018]
6 (a) and 6 (b), a manufacturing procedure of the back side curtain wall member 6 will be described.
A vertical plate 10 made of a PC concrete plate is placed on a support base 18 such that the back surface of the dowel 15 protrudes upwards, and a reinforcing steel bar and a connecting steel bar 14 for forming the rear concrete column 9 are formed. A sheath for forming an insertion hole for inserting the mold is arranged, the formwork 19 is assembled, and concrete is poured. After the concrete is solidified, it is released and transported by crane.
In FIGS. 5 and 6, the front curtain wall member 5 and the rear curtain wall member 6 are formed by being divided into two parts. This is achieved by dividing each member to reduce the weight. Although this is for facilitating transportation and assembly, it may be formed integrally without dividing.
[0019]
The procedure of the method of manufacturing the concrete unit 1 for a fixed type double curtain wall breakwater according to the present invention will be described with reference to FIGS.
As shown in FIG. 7, a work scaffold 20 is set on a concrete bottom slab 3 manufactured in advance on land near a breakwater construction site. On the concrete bottom slab 3, connecting PC steel bars 14 are provided upright at predetermined intervals on the sea side and the land side. A resin is applied to the surface of the connecting steel bar 14 to prevent corrosion.
[0020]
Next, as shown in FIG. 8, the through-hole formed on the back-side concrete support 9 of the back-side curtain wall member 6 previously manufactured in a factory or the like is inserted into the land-side connecting steel bar 14 of the concrete bottom slab 3. The tension jack 21 is connected to the end of the connecting steel bar 14 through the hole, and a tensile load is applied to the connecting PC steel bar 14 using the tension jack 21, thereby forming a rear concrete column. 9 is prestressed and fixed.
[0021]
Next, as shown in FIG. 9, the steel bar 14 on the sea side of the concrete bottom slab 3 is inserted into the steel pillar 14 on the front side of the front curtain wall member 5 of the front curtain wall member 5 manufactured in advance in a factory or the like. A tension jack 21 is connected to the end of the connecting steel rod 14 through the hole, and a tensile load is applied to the connecting PC steel rod 14 using the tension jack 21, and the front concrete pillar 7 is pre-stressed and fixed.
[0022]
Subsequently, as shown in FIG. 10, a work scaffold 20 is provided between the top of the front concrete column 7 of the front curtain wall member 5 and the top of the rear concrete column 9 of the rear curtain wall member 5. A double curtain wall type breakwater unit is connected and integrated with a girder member 11 constructed by cast-in-place concrete construction including reinforcing arrangement work performed from above, installation of a formwork 25, and concrete placement. The girder member 11 may be connected using a member made of PC concrete. Thereafter, the work scaffold 20 on the bottom plate 3 is removed.
[0023]
As shown in FIG. 11, the manufactured concrete unit 1 for a double curtain wall type breakwater is lifted by a crane or the like, loaded on a barge, and installed on the foundation of a rubble excavator 2 built on the sea floor. . The end of the connecting PC steel rod 14 is used as the crane hanging bracket 22. As shown in FIG. 1, a plurality of concrete units 1 for double curtain wall breakwaters are connected in series, and a floor slab 23 is fixed on a concrete girder member 11, and a fixed double curtain wall mold is installed. Build a breakwater.
[0024]
【The invention's effect】
In the present invention configured as described above, in the present invention configured as described above, a plurality of inclined plates arranged at intervals on a concrete bottom slab with a gap in a horizontal blind shape are provided. A front curtain wall member composed of a front column provided on the front side and a rear curtain wall member composed of a rear column provided on the rear side with vertical plates arranged in the vertical direction leaving a gap only at a lower end portion are erected. A concrete unit for a double curtain wall type breakwater is formed in advance by connecting the tops of the front and rear supports with a girder member and integrated, and the concrete unit is suspended at an installation site in the ocean. Since it is installed on the seafloor foundation, it has a simple structure and is particularly easy to construct, shortening the construction period. High wave performance and durable breakwater can be realized.
[0025]
Further, the interval between the lowermost inclined plate and the bottom plate of the front curtain wall member, the incident wave penetrating from the front curtain member passes through the gap of the rear curtain wall member, and the rear of the rear curtain wall member. The size is such that the seawater exchange function of the sea area can be exhibited, and by installing a wave reduction wall higher than the gap in front of or behind the gap, the incident wave is absorbed by overtopping the wave reduction wall, and its energy is absorbed, and the back side Maintain the calmness of the sea area behind the curtain wall member and enhance the seawater exchange function.
The structure of the breakwater with the front and rear double curtain wall members is effective against a wide range of wavelengths of waves, and in particular, has a wavelength of about 5 to 6 times the installation interval of the front and rear curtain wall members. Effective against waves. The wave is attenuated by using the wave resonance caused by the piston motion of the wave generated between the front and back side double curtain wall members, and a vortex is generated at the lower end of the inclined plate of the front curtain wall member. By promoting the energy consumption, transmitted and reflected waves can be efficiently attenuated.
Furthermore, workability by constructing a beam member for connecting the the front curtain wall member rear side curtain wall member in PC concrete member is further improved.
In addition, on land, after assembling and manufacturing a double curtain wall type breakwater unit, by adopting a construction method of connecting the assembled double curtain wall breakwater unit on a foundation formed on the sea floor, The construction period can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of one embodiment of the present invention.
2A is a cross-sectional view of an embodiment of the present invention in which a wave reducing wall is provided in front of a rear curtain wall member, and FIG. 2B is a book in which a wave reducing wall is provided behind a rear curtain wall member. 1 is a cross-sectional view of one embodiment of the present invention.
FIG. 3 is a side view showing a state of manufacturing the bottom plate according to the embodiment of the present invention.
FIG. 4 is a perspective view of a PC plate according to an embodiment of the present invention.
FIG. 5A is a side view showing a state of manufacturing a front wall according to an embodiment of the present invention, and FIG. 5B is a plan view of the same.
FIG. 6A is a side view showing a manufacturing state of a back wall according to one embodiment of the present invention, and FIG. 6B is a plan view of the same.
FIG. 7 is a view showing an installed state of a concrete bottom slab according to one embodiment of the present invention.
FIG. 8 is an explanatory view showing a state in which a back wall is erected according to the embodiment of the present invention.
FIG. 9 is an explanatory view showing a built-in state and a tensioned state of the front wall according to the embodiment of the present invention.
FIG. 10 is an explanatory diagram showing a state in which the front wall and the rear wall are connected according to the embodiment of the present invention.
FIG. 11 is an explanatory view showing a state in which the embankment unit according to the embodiment of the present invention is loaded on a barge.
[Explanation of symbols]
1: Concrete unit for fixed type double curtain wall breakwater 2: Ripstone 3: Concrete bottom slab 4: Ripstone covering work 5: Front curtain wall member 6: Back curtain wall member 7: Front concrete Post 8: Inclined plate 9: Back concrete post 10: Vertical plate 11: Concrete girder member 12: Formwork 13: PC steel bar 14 for connection: PC steel bar 15 for connection: Gibber 16: Support base 17: Formwork 18: Support base 19: Formwork 20: Working scaffold 21: Tension jack 22: Hanging bracket 23: Floor slab 24: Wave reduction wall

Claims (3)

The front concrete strut and the back concrete strut with the connecting PC steel bar buried are erected on the concrete bottom plate with a gap between the front and back, and the front concrete strut has a horizontal blind space. A sea-side front curtain wall member provided with a plurality of inclined plates arranged on the front side is provided on the front side, and the back side of the back side concrete strut has a sea area behind between a lower end portion and a concrete bottom plate. A rear curtain wall member provided with a vertical plate composed of a plurality of PC concrete plates arranged in a vertical direction while leaving a gap large enough to achieve the seawater exchange function of the front curtain wall member and the rear curtain wall member A concrete unit for a stationary double curtain wall type breakwater is constructed by integrating the tops of the members with a concrete girder member, and the concrete unit is installed at an installation site. Stationary double curtain wall type Shonamitsutsumi comprising mounted on a foundation provided in the seabed by being lowered suspended from above in. The fixed type double curtain wall breakwater according to claim 1 , wherein a reduction wall higher than the gap is installed on a concrete bottom plate in front of or behind the gap . After laying a foundation on the sea floor with rubble, etc., on the land, a PC concrete bottom plate with connecting PC steel bars and wave-reducing walls is installed at regular intervals on the offshore side and on the land side. Manufactured, a front curtain wall member having a front support provided with a plurality of inclined plates arranged on the front side with a gap in a horizontal blind shape, and a vertical arranged vertically with a gap only at a lower end portion. A back side curtain wall member having a back side support provided with a plate on the back side, and an offshore and land side connected PC steel rod standing on the bottom plate in insertion holes provided in the front side and the back side support, respectively. After inserting and fixing by applying a prestress, the top of the front side and the back side columns are connected by a girder member to integrally form a concrete unit for a double curtain wall type breakwater, and manufactured. Double curtain wall type Stationary double curtain method for constructing a wave dissipating bank, which comprises continuously provided concrete unit to the base for Namitsutsumi unit.

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