JP6941951B2 - Corrugated steel plate waterway member - Google Patents

Description

The present invention relates to a corrugated steel plate water channel member that uses a steel material to form a water channel.

Concrete construction is generally used for the construction of waterways. However, in recent years, there are cases where a waterway is formed by connecting steel plate waterway members that are easy to construct. In particular, when a waterway is constructed on soft ground, a steel plate waterway member that is lightweight and has high strength is often used.

In a steel plate channel member, when water constantly flows or accumulates in the channel, the steel material corrodes quickly. Therefore, a plated steel plate subjected to hot-dip galvanizing is used as the steel plate water channel member (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2002-121731

When the waterway is constructed with concrete, it takes time and effort. In addition, it is necessary for the manager to regularly repair and maintain joints or cracks even after construction.

On the other hand, when the water channel is constructed with a steel plate water channel member using a plated steel plate, the plating delays the corrosion of the steel material, and the effect of extending the life of the steel plate water channel member can be obtained. However, after all the plating on the plated steel sheet has melted, it is necessary for the manager to maintain and manage the corrosion of the steel material while repairing it. Alternatively, it is necessary to replace the steel plate water channel member using the plated steel plate that has reached the end of its life with a new one. As described above, the maintenance cost or the replacement cost for a new product is high, and the life cycle cost of the corrugated steel plate water channel member is high.
Further, when the water channel was constructed with a steel plate water channel member using a plated steel plate, the corrosion resistance was low.
In addition, when the water channel was constructed with a steel plate water channel member using a plated steel plate, the plate thickness was thick in consideration of the influence of water pressure.

The present invention is for solving the above-mentioned problems, and it is possible to reduce the life cycle cost and improve the corrosion resistance, which are basically two required characteristics, and to increase the plate thickness when used in a water channel. The purpose is to obtain a corrugated steel plate water channel member that can be reduced.

The corrugated steel plate canal member of the present invention is a corrugated steel canal member made of a corrugated steel material which is used for forming a canal and has a corrugated cross section along the flow path direction of the canal. The corrugated steel material is SUS443J1 among ferrite-based stainless steel materials, and the corrugated steel material is provided with a welded portion for attaching an attachment article inside the water channel, and the attachment article is water flowing through the water channel. Water depth meter that detects the water depth of the water, a water temperature meter that detects the temperature of the water flowing through the water channel, a thermometer that detects the outside air temperature around the water channel provided, a water level monitoring camera that monitors the water level of the water flowing through the water channel, It has at least one of a surrounding monitoring camera that monitors the surroundings of the waterway and an information communication terminal .

According to the corrugated steel plate water channel member according to the present invention, the corrugated steel material is stainless steel. Therefore, it is possible to reduce the life cycle cost and the corrosion resistance, which are basically two required characteristics, and to reduce the plate thickness when used in a water channel.

It is a perspective view which shows the construction state of the corrugated steel plate waterway member which concerns on Embodiment 1 of this invention. It is a perspective view which shows the schematic structure of the construction state of the corrugated steel plate waterway member which concerns on Embodiment 1 of this invention. It is a perspective view which shows the schematic structure of the corrugated steel plate waterway member which concerns on Embodiment 1 of this invention. It is a perspective view which shows the schematic structure of the corrugated steel plate water channel member which has the weld part which concerns on Embodiment 1 of this invention. It is a perspective view which shows the schematic structure of the corrugated steel plate waterway member for the corner part which concerns on Embodiment 1 of this invention. It is a figure which shows the Example and the comparative example of the corrugated steel plate waterway member which concerns on Embodiment 1 of this invention.

Hereinafter, embodiments of the corrugated steel plate water channel member according to the present invention will be described. The form of the drawings is an example, and does not limit the present invention. In addition, those having the same reference numerals in the respective figures are the same or equivalent thereof, which are common to the entire text of the specification. Further, in the drawings below, the relationship between the sizes of the constituent members may differ from the actual one.

Embodiment 1.
[Construction status of corrugated steel plate waterway members]
FIG. 1 is a perspective view showing a construction state of the corrugated steel plate water channel member 1 according to the first embodiment of the present invention.
As shown in FIG. 1, the corrugated steel plate water channel member 1 is connected and the lower half of the body is embedded in the ground to form a water channel. For this reason, the corrugated steel plate waterway member 1 is installed in an environment where bacterial corrosion is likely to occur in contact with the soil of the earth, which is a habitat for grass or insects.

The canal is used for an agricultural canal, an industrial canal, or a temporary canal for civil engineering work. The waterway is an open channel with an open upper part through which water flows. In addition, fallen leaves or dust may flow into the waterway. In addition, mud may flow into the waterway.

[Structure of construction state of corrugated steel plate waterway member 1]
FIG. 2 is a perspective view showing a schematic configuration of a construction state of the corrugated steel plate water channel member 1 according to the first embodiment of the present invention.
As shown in FIG. 2, the corrugated steel plate water channel member 1 on the upstream side and the corrugated steel plate water channel member 1 on the downstream side are connected to each other. The downstream end of the corrugated steel plate water channel member 1 on the upstream side and the upstream end of the corrugated steel plate water channel member 1 on the downstream side are overlapped with the sealing material 2 shown by the thick black line interposed therebetween. There is. The downstream end portion of the corrugated steel plate water channel member 1 on the upstream side is overlapped so as to be above the upstream end portion of the corrugated steel plate water channel member 1 on the downstream side. This prevents mud and the like flowing through the waterway from accumulating at the bottom of the waterway. In the connecting portion, the downstream end portion of the corrugated steel plate water channel member 1 on the upstream side and the upstream end portion of the corrugated steel plate water channel member 1 on the downstream side are bolted and connected.

In the corrugated steel plate water channel member 1, an abdominal raising 3 is arranged on the upper end edge protruding upward of the side wall portion for reinforcement. The abdomen 3 is made of L-shaped steel and is provided along the flow path direction on the upper end edges of the side wall portions 1a and 1b of the corrugated steel plate water channel member 1. The abdominal raising 3 is fixed to the corrugated steel plate water channel member 1 by bolting.

For reinforcement, the corrugated steel plate water channel member 1 is bridged by an abdomen fixed to the upper end edge protruding upward from the left and right side wall portions 1a and 1b in the flow path direction, and the girder 4 Is placed. The girder 4 is made of L-shaped steel, and is provided on the raised abdomen 3 fixed to the upper end edges of the left and right side wall portions 1a and 1b over a width direction orthogonal to the flow path direction. The girder 4 is bolted to the abdomen 3 and fixed.

[Structure example 1 of corrugated steel plate water channel member 1]
FIG. 3 is a perspective view showing a schematic configuration of a corrugated steel plate water channel member 1 according to a first embodiment of the present invention.
As shown in FIG. 3, the corrugated steel plate water channel member 1 is made of a corrugated steel material having a corrugated cross section along the flow path direction. The corrugated steel plate water channel member 1 is formed by bending a corrugated steel material having a corrugated cross section along the flow path direction into a U-shaped groove in which peaks and valleys are alternately continuous in the longitudinal direction, which is the flow path direction. It was done.

The corrugated steel plate water channel member 1 has left and right side wall portions 1a and 1b and a lower bottom wall portion 1c so as to form a U-shaped groove. The corrugated steel plate water channel member 1 has side wall portions 1a and 1b erected from the bottom wall portion 1c to both left and right end portions. The bottom wall portion 1c and the side wall portions 1a and 1b are connected by being curved and having corners formed into an R curve.
The corrugated steel plate water channel member 1 is formed with bolt holes (not shown) for connection at the upstream end, the downstream end, and the upper edge.

The corrugated steel plate water channel member 1 is not limited to the shape of the U-shaped groove. The corrugated steel plate water channel member 1 may have any shape as long as it can be formed by bending a corrugated steel material having a corrugated cross section along the flow path direction. The bottom wall portion 1c may be entirely formed with an R curve. Further, the corrugated steel plate water channel member 1 may have a flange portion that protrudes outward from each of the left and right sides on the upper edge portions of the side wall portions 1a and 1b and is provided along the flow path direction.

[Structure example 2 of corrugated steel plate water channel member 1]
FIG. 4 is a perspective view showing a schematic configuration of a corrugated steel plate water channel member 1 having a welded portion 5 according to the first embodiment of the present invention. In the configuration example 2 of the corrugated steel plate water channel member 1, the description of the same configuration as the configuration example 1 of the corrugated steel plate channel member 1 described above will be omitted, and only the characteristic portion will be described.

As shown in FIG. 4, the corrugated steel plate water channel member 1 is provided with a water depth meter 6 for detecting the depth of water flowing through the water channel inside the side wall portion 1a. Therefore, the corrugated steel plate water channel member 1 has a welded portion 5 in a black region shown in the drawing as a mounting portion for attaching the water depth gauge 6.
As the corrugated steel plate water channel member 1 to which the water depth gauge 6 is attached, the corrugated steel plate water channel member 1 for the straight portion shown in FIG. 3 will be given as an example.
Further, the attachment article attached by the welded portion 5 is not limited to the water depth gauge. The attached article may be, for example, an instrument such as a water temperature gauge or a thermometer, a water level monitoring camera, an ambient monitoring camera, an information communication terminal, or a composite device thereof.

The welded portion 5 uses, for example, TIG butt welding or the like. In TIG butt welding, the base materials are butted against each other to generate an arc between the non-consumable electrode and the base material. Then, in TIG butt welding, this arc is used as a heat source to melt the filler rod and the base metal, and an inert gas is passed around the molten portion. As a result, in TIG butt welding, the welded portion is welded while being shielded from the ambient air.

The welding to the welded portion 5 is not limited to TIG butt welding. For example, shielded metal arc welding, TIG welding, MIG welding, MAG welding and the like may be used.

[Structure example 3 of corrugated steel plate water channel member 1]
FIG. 5 is a perspective view showing a schematic configuration of a corrugated steel plate water channel member 1 for a corner portion according to a first embodiment of the present invention. In the configuration example 3 of the corrugated steel plate water channel member 1, the description of the same configuration as the configuration examples 1 and 2 of the corrugated steel plate channel member 1 described above will be omitted, and only the characteristic portion will be described.

The corrugated steel plate water channel member 1 shown in FIG. 5 is for a corner portion. The corrugated steel plate water channel member 1 for the corner portion has an upstream side component 1d and a downstream side component 1e. The corrugated steel plate water channel member 1 for the corner portion has a welded portion 5 welded so as to connect the upstream side component 1d and the downstream side component 1e. That is, the welded portion 5 connecting the upstream side component 1d and the downstream side component 1e is long to both upper ends over both side wall portions 1a and 1b and the bottom wall portion 1c with respect to the flow path direction of the corrugated steel plate water channel member 1. It has a welded area.

In the upstream side component 1d, in the state of the corrugated steel plate water channel member 1 for the straight portion shown in FIG. 3, marking is performed on the portion to be the welded portion 5 connected to the downstream side component 1e. Further, in the downstream side component 1e, in the state of the corrugated steel plate water channel member 1 for the straight line portion shown in FIG. 3, marking is performed on the portion to be the welded portion 5 connected to the upstream side component 1d.
The upstream component 1d is cut along the ruled line, and the cut surface is sanded to smooth the surface. Further, the downstream component 1e is cut along the ruled line where the ruled line is formed, and the cut surface is sanded to smooth the surface.
Then, the upstream component 1d and the downstream component 1e are finely adjusted by striking or the like in order to match the wave shape of the steel plate in a state where the upstream component 1d and the downstream component 1e are connected. After that, in the upstream part 1d and the downstream part 1e, the cut surfaces of both are temporarily fixed by temporary welding, and the cut surfaces of both temporarily fixed are connected by main welding, which is TIG butt welding.

[Component composition of corrugated steel plate water channel member 1]
The steel material of the corrugated steel plate water channel member 1 is stainless steel. Further, the steel material is preferably ferritic stainless steel among stainless steels. In particular, the steel material is most preferably SUS443J1 (JIS standard) among ferritic stainless steels.

Here, SUS443J1 is mass%, C: 0.03% or less, Si: 1.0% or less, Mn: 0.5% or less, P: 0.04% or less, S: 0.02% or less. , Al: 0.1% or less, Cr: 20.5% or more, 22.5% or less, Cu: 0.3% or more, 0.8% or less, Ni: 1.0% or less, Ti: 4 × ( C% + N%) or more, 0.35% or less, Nb: 0.01% or less, N: 0.03% or less, C + N: 0.05% or less, and the balance consists of Fe and unavoidable impurities. The following equation (1) is satisfied.
[Equation (1)] 240 + 35 × (Cr% -20.5) + 280 × {Ti% -4 × (C% + N%)} ≧ 280
Here, C%, N%, Cr%, and Ti% represent the contents (mass%) of C, N, Cr, and Ti, respectively.

[Comparison between Examples and Comparative Examples]
FIG. 6 is a diagram showing an example and a comparative example of the corrugated steel plate water channel member 1 according to the first embodiment of the present invention.
The present inventors have Example 1-3 in which the steel material of the corrugated steel plate water channel member 1 is SUS443J1, Example 4, which is a steel material containing other stainless steel, Example 5 which is SUS430, and Example 6 which is SUS304. The verification of the present invention and Comparative Examples 1-3 was carried out.
Example 1-3 is a steel material in which the steel material satisfies the composition of SUS443J1.
In Example 4, the steel material is stainless steel, which is not SUS443J1. In Example 5, the steel material is SUS430. In Example 6, the steel material is SUS304. In Comparative Example 1, the steel material is a galvanized steel sheet HDZ45. In Comparative Example 2, the steel material is a galvanized steel sheet HDZ55. In Comparative Example 3, the steel material is a hot-rolled steel sheet.

In FIG. 6, the criteria for each test and verification are as follows.

(1) Salt spray test on flat plate material: A test piece of 2 mm × 70 mm × 150 mm was sprayed with 5% NaCl in a tank at 35 ° C. for 5000 hours in accordance with JIS K 5600-7-1. rice field. After the test, if the surface rate of red rust is less than 10%, ◎ (pass), if it is 10% or more and less than 30%, ○ (possible), if it is 30% or more and less than 50%, △ (inappropriate), and if it is 50% or more. If there is, it was judged as × (failed).

(2) Salt spray cycle test on a welded material having a welded portion: Two pieces of 2 mm × 35 mm × 150 mm specimens were TIG welded in the longitudinal direction. After polishing the surface of the welded part with # 600, it was subjected to a test. A 30-cycle test was carried out in which 5% NaCl was sprayed for 2 hours (35 ° C.) → dry (60 ° C., RH 30%) for 4 hours → wet (50 ° C., RH 95%) for 2 hours. If the area ratio of red rust generated at the weld is less than 10%, ◎ (pass), if it is 10% or more and less than 30%, ○ (possible), if it is 30% or more and less than 50%, △ (inappropriate), 50%. If it is more than that, it is judged as × (failure).

(3) Magnetism: A normal ferrite magnet of 15 mmφ was brought close to each other, and it was judged as ◯ (possible) if there was an attractive force, and × (failed) if there was no attractive force.

(4) Initial introduction cost: As a purchase cost, if the cost is equal to or less than that of the conventional galvanized steel sheet HDZ45, ◎ (pass), if it is more than 1 times and 1.75 times or less, ○ (possible), 1. If it was more than 75 times and less than 3 times, it was judged as Δ (inappropriate), and if it was more than 3 times, it was judged as × (failed).

(5) Life cycle cost (LCC): The total cost of 40 years, which is the general period until renewal including repair and maintenance costs including the initial cost of installation, is 1/3 of the conventional galvanized steel sheet HDZ45. If it is less than or equal to ◎ (pass), if it is more than 1/3 and less than 0.8 times, it is ○ (possible), if it is more than 0.8 times and less than 1 time, it is △ (inappropriate), and if it is 1 times or more, it is × ( Fail).

As shown in FIG. 6, in the example of the present invention which is the embodiment 1-3 of the present invention, the low initial introduction cost of the corrugated steel plate water channel member 1, the improvement of the corrosion resistance in outdoor exposure, and the partial under water exposure. It was confirmed that the corrosion resistance at the welded portion 5 to be performed was improved. Due to these effects, the life cycle cost of the corrugated steel plate water channel member 1, which is basically required as a synergistic effect, can be reduced more remarkably, and the long-term durability is remarkably excellent. Therefore, it can be seen that all the characteristics required for future waterway equipment can be improved.

[Effect of Embodiment 1]
According to the first embodiment, the corrugated steel plate water channel member 1 uses a corrugated steel material having a corrugated cross section along the flow path direction. The corrugated steel material is stainless steel.
According to this configuration, since the corrugated steel material of the corrugated steel plate water channel member 1 is stainless steel, the life of the corrugated steel plate water channel member 1 can be significantly extended. Further, the corrugated steel plate water channel member 1 can be significantly reduced in maintenance and management by repair, which is indispensable for the conventional water channel member or the concrete water channel structure. As a result, the life cycle cost of the corrugated steel plate water channel member 1 can be reduced.
Further, since the corrugated steel material of the corrugated steel plate water channel member 1 is stainless steel, the corrosion resistance can be improved as proved by the test of the flat plate material.
Therefore, it is possible to reduce the life cycle cost and improve the corrosion resistance, which are basically two required characteristics.
In addition, since the corrugated steel material of the corrugated steel plate water channel member 1 is stainless steel, the material strength is improved, and when used in a water channel where water pressure is applied, the plate thickness can be reduced as compared with a plated steel sheet. Further, the corrugated steel plate water channel member 1 can be dramatically reduced in weight as compared with a concrete water channel structure or the like. As a result, the lightweight corrugated steel plate water channel member 1 can improve workability on soft ground, and can also improve transportation cost and handleability.

According to the first embodiment, the corrugated steel material is ferritic stainless steel among stainless steels.
According to this configuration, since the corrugated steel material is ferritic stainless steel, the corrugated steel plate water channel member 1 has magnetism. Therefore, the corrugated steel plate water channel member 1 can be attracted and moved or installed by the action of magnetic force using an electromagnet heavy machine such as a lifting magnet work vehicle. As a result, the handleability of the work in which the corrugated steel plate water channel member 1 is installed in the water channel can be improved. Therefore, as the number of young workers decreases in the future, even if the number of workers is small, elderly or female, the construction work of the corrugated steel plate waterway member 1 can be easily performed, resulting in a recent labor shortage. Suitable characteristics are obtained.
Further, when the corrugated steel plate water channel member 1 is mixed with concrete or a resin member and discarded due to a large-scale repair of the water channel, the corrugated steel plate water channel member 1 having magnetism is a separator using an electromagnet or the like. It can be easily separated by attracting it by the action of magnetic force. As a result, the corrugated steel plate water channel member 1 can be separated from other materials and recycled, and characteristics suitable for environmental friendliness (separate disposal recycling) can be obtained.

According to the first embodiment, the corrugated steel material is SUS443J1 among the ferrite stainless steels.
According to this configuration, since the corrugated steel material is SUS443J1, expensive Mo and the like are not added, the price of the material is stable, and the initial introduction cost is relatively low. Further, the corrugated steel plate water channel member 1 is excellent in corrosion resistance in outdoor exposure. Further, it is excellent in corrosion resistance at the welded portion 5 where the corrugated steel plate water channel member 1 is partially formed. As a result, due to the low initial introduction cost of the corrugated steel plate water channel member 1, the improvement of the corrosion resistance in outdoor exposure, and the improvement of the corrosion resistance at the welded portion 5, the wave is basically required as a synergistic effect. The life cycle cost of the template steel plate water channel member 1 can be significantly reduced, and the long-term durability is remarkably excellent. Therefore, all the characteristics required for future waterway equipment can be improved.

According to the first embodiment, the corrugated steel plate water channel member 1 has a welded portion 5 for attaching an attachment article.
According to this configuration, the corrugated steel plate water channel member 1 is welded to a mounting portion to which a mounting article such as a water depth gauge is mounted, and has a welded portion 5. Here, in the case of a plated steel sheet, the welded portion is in a thin plated state and tends to be easily corroded. Further, when the steel material is stainless steel such as SUS430, Cr carbide is generated in the welded portion heated to 600 ° C. to 800 ° C. at the time of welding, and a deficient layer having a Cr content of less than 12% is formed, resulting in stress. Sensitivity occurs, which increases the sensitivity to corrosion cracking. For this reason, the sensitized welded portion tends to have lower durability than the non-welded portion. On the other hand, when the corrugated steel material is SUS443J1, the corrugated steel plate water channel member 1 contains Ti as a component of SUS443J1, so that a depletion layer having a Cr content of less than 12% is unlikely to occur even during welding, and the welded portion 5 Can suppress the sensitization of. As a result, the corrugated steel plate water channel member 1 is excellent in corrosion resistance at the welded portion 5, and is excellent in long-term durability.

According to the first embodiment, the corrugated steel plate water channel member 1 is for a corner portion. The corrugated steel plate water channel member 1 has an upstream component 1d and a downstream component 1e. The corrugated steel plate water channel member 1 has a welded portion 5 that connects the upstream component 1d and the downstream component 1e.
According to this configuration, the welded portion 5 connecting the upstream side component 1d and the downstream side component 1e extends over both side wall portions 1a and 1b and the bottom wall portion 1c with respect to the flow path direction of the corrugated steel plate water channel member 1. It has a welded area that is long welded to the upper end. The welded portion 5 connecting the upstream component 1d and the downstream component 1e is a portion that is easily corroded under water exposure that comes into direct contact with the water flowing through the corrugated steel plate water channel member 1 for the corner portion. On the other hand, since the corrugated steel plate water channel member 1 for the corner portion contains Ti as a component of SUS443J1, the sensitization of the welded portion 5 connecting the upstream side component 1d and the downstream side component 1e can be suppressed. Therefore, the corrugated steel plate water channel member 1 for the corner portion having a long welded region as the welded portion 5 has excellent corrosion resistance at the welded portion 5 under water exposure, excellent long-term durability, and a corrugated steel plate for the corner portion. The life cycle cost of the water channel member 1 can be further reduced.

It should be noted that the embodiments disclosed this time are examples in all respects and are not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 corrugated steel plate channel member, 1a side wall part, 1b side wall part, 1c bottom wall part, 1d upstream side part, 1e downstream side part, 2 sealing material, 3 raised, 4 cut beam, 5 welded part, 6 water depth Total.

Claims (4)

A corrugated steel plate water channel member made of a corrugated steel material used for forming a water channel and having a corrugated cross section along the flow path direction of the water channel.
The corrugated steel material is SUS443J1 among ferritic stainless steels .
The corrugated steel material is provided with a welded portion for attaching an attachment article inside the water channel.
The attached article includes a water depth meter that detects the depth of water flowing through the water channel, a water temperature meter that detects the temperature of water flowing through the water channel, a thermometer that detects the outside air temperature around the water channel, and the water channel. A corrugated steel plate water channel member having at least one of a water level monitoring camera that monitors the water level, an ambient monitoring camera that monitors the surroundings of the water channel, and an information communication terminal. The corrugated steel plate water channel member according to claim 1, wherein the corrugated steel material has a reinforcing beam provided so as to be bridged to an upper end portion of the water channel having a U-shaped groove. The corrugated steel material has an abdomen provided at the upper end of the water channel along the flow path direction of the water channel.
The corrugated steel plate water channel member according to claim 2 , wherein the girder is fixed to the raised portion and provided on the corrugated steel material. The corrugated steel plate water channel member is for a corner portion and has an upstream side component and a downstream side component.
The corrugated steel plate water channel member according to any one of claims 1 to 3 , which has a welded portion connecting the upstream component and the downstream component.

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