JP2004082780A - Comb-shaped floating body structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a comb-shaped floating body structure in which reduction of weight and shortening of manufacturing time are achieved to reduce manufacturing cost in relation to manufacturing, and in which turbulent flow in rivers on the outlet side of a leg part can be restricted in relation to functions. <P>SOLUTION: This comb-shaped floating body structure comprises a leg part 31 extended in one direction to have a reverse T-shaped cross sectional form, and a floor slab 12 provided at an upper part of the leg part 31, so that it is installed to float on water, with part of the leg part 31 immersed in water. A wall part 15 of the leg part 31 is provided with a corrugated structure having a cross sectional form having irregularities as a plane. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a comb floating structure used in a large floating structure such as a mega float.
[0002]
[Prior art]
2. Description of the Related Art In general, a comb-shaped floating structure is used as a large floating structure that is suspended and installed on the water surface so as not to obstruct the flow of a river or seawater.
[0003]
FIG. 4 shows a conventional comb-shaped floating structure.
In FIG. 4, although not shown, the comb-shaped floating structure 10 has legs each extending in one direction with an inverted T-shaped cross-sectional profile and formed with a hollow portion inside. A plurality of floors 11 are provided, and a floor slab 12 is erected above the leg 11 with a fixed support. Although not shown, a plurality of partition walls and a stiffener are provided between the opposed side walls of the wall within the leg 11.
[0004]
The comb-shaped floating structure 10 floats on a water surface such as a river or seawater, and is installed so that the direction in which the legs 11 extend is the same as the flow of the river. Since the comb-shaped floating structure 10 has a large buoyancy by arranging a plurality of legs 11 in a comb shape, only the lower part 21 of the legs 11 is submerged, and the upper part 22 of the legs and the floor slab 12 are located on the water surface. I do.
[0005]
In the comb-shaped floating structure 10, when the flow rate of the river increases, when the flow of the river flows between the legs 11, the passage area of the river at the entrance side of the legs 11 becomes narrower, and the flow velocity of the river increases. . When the flow of the river passes between the legs 11, the passage area of the river does not change, so that the flow velocity of the river becomes constant. Thereafter, when the flow of the river flows out from between the legs 11, the passage area of the river at the outlet side of the legs becomes wider, and the flow velocity of the river again decreases.
[0006]
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional comb-shaped floating structure, since the lower part of the leg structure is submerged, an external load such as water pressure is applied larger than the structure other than the leg part, and the structural dynamics is increased. Specifically, the structure gives more cross-sectional rigidity to the longitudinal strength in the cross-section. In this case, the stiffener provided inside the leg is provided more than the stiffener other than the leg. Therefore, there is a problem in that the weight of the device increases, the number of manufacturing steps required for the welding operation and the like increases, and the manufacturing time increases, resulting in an enormous manufacturing cost.
[0007]
Further, in the above conventional comb-shaped floating structure, when the flow rate of the river increases, the flow velocity of the river, which is reduced when flowing out from between the legs, is large because the flow velocity difference before and after the flow is large. Turbulence is generated at the outlet side, and cavitation is generated by the turbulence, and there is a problem that the leg structure is affected by corrosion or the like.
[0008]
The present invention has been made in view of such circumstances, and in terms of manufacturing, the weight is reduced and the manufacturing time is reduced, so that the manufacturing cost is reduced. An object of the present invention is to provide a comb-shaped floating structure in which turbulence of a river at an exit side is suppressed.
[0009]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
The invention according to claim 1 is a leg that extends in one direction with an inverted T-shaped cross-sectional profile and is formed by a wall that forms a hollow portion therein, and is bridged over an upper portion of the leg. In a comb-shaped floating body structure that is composed of a floor slab and a part of the leg portion is submerged and floats on the water surface, the wall portion has a side surface swelling as viewed from a cross section. It is characterized in that it has a shape in which protrusion and swelling of the other surface to the side are repeated continuously.
[0010]
According to the present invention, in the comb-shaped floating structure, the shape of the wall portion viewed from the cross section has a shape in which one surface swells continuously and the other surface swells continuously. By doing so, it is not necessary to newly provide a stiffener, so that the overall weight of the leg is reduced and the manufacturing time is shortened.
[0011]
According to a second aspect of the present invention, in the comb-shaped floating structure according to the first aspect, at least the side wall portion of the wall portion, when viewed from a cross section, swells to the side of one surface and forms the other surface. It is characterized in that it has a shape that continuously repeats bulging to the side.
[0012]
According to a third aspect of the present invention, in the comb-shaped floating structure according to the first or second aspect, the wall is formed in a shape in which a trapezoid, a rectangle, or a triangle is continuously repeated.
[0013]
According to these inventions, the flow velocity of the river flowing between the legs is such that the shape of the side wall as viewed from the cross section swells to the side of one surface and the swells to the side of the other surface. This is suppressed by the shape that is continuously repeated, and the difference from the flow velocity of the river, which decreases on the exit side of the leg, is reduced. Therefore, generation of turbulence is suppressed.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are views showing one embodiment of the present invention, and are views showing a part of a comb-shaped floating structure to which the present invention is applied.
1 and 2, reference numeral 30 denotes a comb-shaped floating structure to which the present invention is applied.
The comb-shaped floating structure 30 includes a leg portion 31 and the floor slab 12.
The leg portion 31 has a hollow portion 23 inside the wall portion 15 extending in one direction with an inverted T-shaped cross-sectional profile. The partition part 13 is provided on the leg part 31 between the opposing side wall parts 25 of the wall part 15.
The wall 15 includes a side wall 25, an inclined part 26, a vertical part 27, and a bottom part 28. The side wall portion 25, the inclined portion 26, and the vertical portion 27 have a shape in which the swelling of one surface and the swelling of the other surface are continuously repeated as viewed from their respective cross sections. Have been. The bottom portion 28 has a shape that continuously repeats swelling of one surface to the side and swelling of the other surface to the side when viewed from the vertical cross section. These shapes form trapezoids.
[0015]
The floor slab 12 has a hollow portion 24 inside a wall portion 19 extending in one direction with a rectangular cross-sectional profile, and is installed with a fixed support portion. In the floor slab 12, the partition 17 is provided between the opposed side walls 29 of the wall 19, and the stiffener 18 is similarly provided on the wall 15 and the partition 17.
[0016]
The comb-shaped floating structure 30 floats on a water surface such as a river or seawater, and is installed so that the direction in which the legs 31 extend is the same as the flow of the river. Since the comb-shaped floating structure 30 has a large buoyancy by arranging a plurality of legs 31 in a comb shape, only the lower portion 21 of the legs 31 is submerged, and the upper portion 22 of the legs and the floor slab 12 are located on the water surface. I do.
[0017]
In the comb-shaped floating structure 30 having the above-described configuration, the wall portion 15 is formed in a shape that repeats a trapezoid continuously, so that the wall portion 15 plays a role equivalent to a structural stiffener and the longitudinal strength in the cross section. Therefore, there is no need to newly provide a stiffener. Therefore, the total weight of the legs 31 is reduced due to the elimination of the stiffener, and the work time for welding the stiffener by welding is reduced due to the reduction in the number of manufacturing steps of the stiffener. Will be done.
[0018]
According to the above configuration, since the wall portion 15 has the above-described shape, a stiffener is not required, so that the total weight of the leg portions 31 is reduced, and the total weight of the comb-shaped floating structure 30 is reduced. Thus, the weight can be reduced. Moreover, since the work time for joining the stiffeners by welding is reduced, the number of man-hours for manufacturing the entire comb-shaped floating structure 30 can be reduced, and the manufacturing time can be shortened.
Furthermore, the manufacturing cost of the comb-shaped floating structure 30 can be reduced by reducing the manufacturing weight and the manufacturing time of the comb-shaped floating structure 30.
[0019]
Next, another operation of the comb-shaped floating structure having the above configuration will be described.
When the flow of the river flows in the downstream direction, it passes between the legs 31 arranged on the water surface. Here, when the flow rate of the river increases due to heavy rain or the like, in the comb-shaped floating structure 10 shown in FIG. 4, a large difference occurs in the flow velocity of the river before and after the flow of the river flows out from between the legs. Although turbulence is generated on the outlet side of the leg, the turbulence in this case is suppressed in the above-described comb-shaped floating structure 30. That is, in the comb-shaped floating structure 30, when the flow of the river flows between the legs, the passage area of the river becomes narrower on the entrance side of the legs, so that the flow velocity of the river increases. When passing, the vortex is generated due to the above-mentioned shape provided on the wall portion 15 and fluid energy is lost, so that the flow velocity of the river gradually decreases until the flow of the river flows out from between the legs 31. It will go. Therefore, this flow velocity does not significantly differ from the flow velocity of the river before the flow of the river flows out from between the legs 31.
[0020]
In the above configuration, since the flow velocity of the river does not cause a difference in flow velocity before and after flowing out from between the legs 31, turbulence on the outlet side of the legs is suppressed. Therefore, it is possible to eliminate factors causing structural problems due to turbulence, such as generation of cavitation causing corrosion.
[0021]
In the above embodiment, the shape provided on the wall 15 may be rectangular or triangular as shown in FIG. In addition to these, any shape may be used as long as the same effect as that obtained by the above embodiment can be obtained. Further, an existing material having the above shape, such as a steel sheet pile, may be used.
[0022]
Further, in the above-described embodiment, the above-described shape provided in the wall portion 15 is such that all of the wall portions are bulged to the side of one surface and to the side of the other surface when viewed from the cross section. May be continuously repeated. Alternatively, in order to obtain the effect of reducing the number of manufacturing steps obtained by the above embodiment, all of the walls are bulged to the side of one surface and to the side of the other surface, as viewed from the longitudinal section. May be continuously repeated.
[0023]
Further, in the above-described embodiment, the above-described shape provided on the wall portion 15 is not the entire wall portion 15 but a water surface or a flooded surface, in order to obtain the same effect as that obtained by the above-described embodiment. It may be provided only in the portion where
[0024]
In the above-described embodiment, the above-mentioned shape provided on the wall 15 may be a part of the wall 15 such as not having the above-mentioned shape at the bottom, for example, due to manufacturing or structural reasons. By changing the structure, the structure of the leg portion 31 may be a structure formed by a combination of the above shape and other shapes.
[0025]
【The invention's effect】
The comb-shaped floating structure of the present invention described above has the following effects.
According to the first aspect of the present invention, the wall portion has a shape in which the side surface swells continuously and the other surface swells sideways when viewed from the cross section. This eliminates the need for a stiffener, so that the total weight of the legs and the comb-shaped floating structure is reduced, and the weight of the entire comb-shaped floating structure can be reduced. Further, since the work time for joining the stiffeners by welding is reduced, the man-hour for manufacturing the entire comb-shaped floating structure is reduced, and the manufacturing time can be shortened.
Further, by reducing the manufacturing weight and the manufacturing time of the comb-shaped floating structure, the manufacturing cost of the entire comb-shaped floating structure can be reduced.
[0026]
According to the second and third aspects of the present invention, the flow velocity of the river is such that, when viewed from the cross section, the swelling of one surface to the side and the swelling of the other surface to the side are continuous. Since the flow of the river does not cause a large flow velocity difference before and after flowing out from between the legs, the turbulent flow on the outlet side of the legs is suppressed. Therefore, it is possible to eliminate factors causing structural problems due to turbulence, such as generation of cavitation that causes corrosion.
[Brief description of the drawings]
FIG. 1 is a partial perspective view of a comb-shaped floating structure according to an embodiment of the present invention.
FIG. 2 is a sectional view of a leg of the comb-shaped floating structure according to the embodiment of the present invention.
FIG. 3 is a view showing a cross-sectional shape of a wall of a comb-shaped floating structure according to an embodiment of the present invention.
FIG. 4 is a perspective view of a conventional comb-shaped floating structure.
[Explanation of symbols]
10, 30 Comb-shaped floating structure 11, 31, Leg 12, Floor slab 13, 17 Partition wall 18, Stiffener 15, 19 Wall

Claims (3)

It comprises a leg portion extending in one direction with an inverted T-shaped cross-sectional profile, a wall portion forming a hollow portion inside, and a floor slab erected on the upper portion of the leg portion, In a comb-shaped floating structure where a part of the leg is submerged and floats on the water surface,
A comb-shaped floating structure, wherein the wall portion has a shape in which, when viewed from a cross section, swelling of one surface to the side and swelling of the other surface to the side are continuously repeated. . The comb-shaped floating structure according to claim 1,
At least the side wall portion of the wall portion has a shape in which, when viewed from a cross section, the side surface swells continuously and the other surface swells sideways. Floating structure. The comb-shaped floating structure according to claim 1 or 2,
The said wall part is formed by the shape which repeats a trapezoid, a rectangle, or a triangle continuously, The comb-shaped floating body structure characterized by the above-mentioned.

Images