JP2018162594A - Corrugated steel plate-made water channel member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated steel plate-made water channel member capable of not only reducing life cycle cost and improving corrosion resistance, both of which are two fundamentally necessary characteristics, but reducing a plate thickness for use in a water channel.SOLUTION: A corrugated steel plate-made water channel member is configured by using a corrugated steel plate of which a cross section along a water passage is formed into a wave shape, the corrugated steel plate is made of stainless steel.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a corrugated steel sheet channel member that uses steel to constitute a channel.

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

  In the steel plate channel member, when the water always flows or accumulates in the channel, the steel material corrodes quickly. For this reason, a galvanized steel sheet subjected to hot dip galvanization is used for the steel plate channel member (see, for example, Patent Document 1).

JP 2002-121731 A

  When a waterway is constructed with concrete, it takes time and labor for construction. In addition, it is necessary for the manager to regularly repair and maintain joints or cracked parts after construction.

On the other hand, when the water channel is constructed with a steel plate 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 channel member is obtained. However, after all the plating on the plated steel sheet is dissolved, the manager needs to maintain and manage the steel material while repairing the corrosion. Or it is necessary to replace | exchange the steel plate channel member using the plated steel plate which ended the life to a new article. Thus, the maintenance management cost or the new article replacement cost was required, and the life cycle cost of the corrugated steel sheet channel member was high.
Moreover, when a water channel was constructed with a steel plate channel member using a plated steel plate, the corrosion resistance was low.
In addition, when the water channel was constructed with a steel plate 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 the thickness of the sheet when used in a water channel. The object is to obtain a corrugated steel channel member that can be reduced.

  The corrugated steel channel member of the present invention is a corrugated steel channel member using corrugated steel having a corrugated cross section along the flow path direction, and the corrugated steel is stainless steel. It is.

  According to the corrugated steel plate 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 improve 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 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 schematic structure of the corrugated steel plate waterway member which concerns on Embodiment 1 of this invention. It is a perspective view which shows schematic structure of the corrugated steel plate waterway member which has a welding part which concerns on Embodiment 1 of this invention. It is a perspective view which shows schematic structure of the corrugated steel plate channel member for corner parts which concerns on Embodiment 1 of this invention. It is a figure which shows the Example and comparative example of a corrugated steel plate water channel member which concern on Embodiment 1 of this invention.

  Hereinafter, embodiments of the corrugated steel channel member according to the present invention will be described. In addition, the form of drawing is an example and does not limit this invention. Moreover, what attached | subjected the same code | symbol in each figure is the same, or is equivalent to this, and this is common in the whole text of a specification. Furthermore, in the following drawings, the relationship between the sizes of the constituent members may be different from the actual one.

Embodiment 1 FIG.
[Construction state of corrugated steel channel member]
FIG. 1 is a perspective view showing a construction state of a corrugated steel sheet waterway member 1 according to Embodiment 1 of the present invention.
As shown in FIG. 1, the corrugated steel plate channel member 1 is connected to a state where the lower half is buried in the ground, and configures the channel. For this reason, the corrugated steel plate channel member 1 is installed in an environment in which bacterial corrosion is likely to occur due to contact with the earth soil, which is a habitat environment such as grass or insects.

  The water channel is used as an agricultural water channel, an industrial water channel, or a temporary water channel for civil engineering. The water channel is an open channel whose upper side is opened, and water flows. In addition, fallen leaves or garbage may flow into the waterway. In addition, mud may flow into the waterway.

[Configuration of construction state of corrugated steel sheet channel member 1]
FIG. 2 is a perspective view showing a schematic configuration of the construction state of the corrugated steel sheet waterway member 1 according to Embodiment 1 of the present invention.
As shown in FIG. 2, the upstream corrugated steel sheet channel member 1 and the downstream corrugated steel channel member 1 are connected. The downstream end portion of the upstream corrugated steel sheet channel member 1 and the upstream end portion of the downstream corrugated steel channel member 1 are overlapped with a black line seal material 2 interposed therebetween. Yes. The upstream end portion of the corrugated steel sheet channel member 1 on the upstream side is overlapped with the upstream end portion of the downstream corrugated steel sheet channel member 1 on the upstream side. As a result, mud flowing in the water channel is prevented from accumulating at the bottom of the water channel. At the connecting portion, the downstream end of the upstream corrugated steel sheet channel member 1 and the upstream end of the downstream corrugated steel channel member 1 are bolted and connected.

  The corrugated steel plate channel member 1 is provided with an uprising 3 on the upper edge protruding above the side wall portion for reinforcement. The flank 3 is made of L-shaped steel, and is provided on the upper edge of the side wall portions 1a and 1b of the corrugated steel plate channel member 1 along the flow path direction. The erection 3 is bolted and fixed to the corrugated steel channel member 1.

  The corrugated steel plate channel member 1 is bridged by a raised ridge fixed to the upper edge protruding above the left and right side wall portions 1a, 1b with respect to the channel direction for reinforcement. Is arranged. The cut beam 4 is made of L-shaped steel, and is provided on the erection 3 fixed to the upper end edges of the left and right side wall portions 1a and 1b over the width direction perpendicular to the flow direction. The cut beam 4 is fixed to the erection 3 by bolting.

[Configuration Example 1 of Corrugated Steel Channel Member 1]
FIG. 3 is a perspective view showing a schematic configuration of the corrugated steel plate waterway member 1 according to Embodiment 1 of the present invention.
As shown in FIG. 3, the corrugated steel plate channel member 1 is made of corrugated steel having a corrugated cross section along the flow path direction. The corrugated steel sheet 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, with ridges and valleys being alternately continuous in the longitudinal direction that is the flow path direction. It is a thing.

The corrugated steel channel member 1 has left and right side walls 1a and 1b and a lower bottom wall 1c so as to form U-shaped grooves. The corrugated steel plate waterway member 1 has side wall portions 1a and 1b erected from the bottom wall portion 1c to the left and right ends. The bottom wall portion 1c and the side wall portions 1a and 1b are connected to each other by being curved and having corners formed into R curves.
In the corrugated steel plate channel member 1, bolt holes (not shown) for connection are formed at the upstream end, the downstream end, and the upper edge.

  In addition, the corrugated steel plate waterway member 1 is not limited to the shape of the U-shaped groove. The corrugated steel plate 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 1c may be entirely formed with an R curve. Moreover, the corrugated steel plate channel member 1 may have flange portions that protrude outwardly on the left and right sides of the upper edge portions of the side wall portions 1a and 1b and are provided along the flow path direction.

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

As shown in FIG. 4, a depth gauge 6 for detecting the depth of water flowing through the water channel is attached to the corrugated steel plate channel member 1 inside the side wall 1a. For this reason, the corrugated steel plate channel member 1 has a welded portion 5 in the illustrated black region as an attachment portion to which the depth gauge 6 is attached.
In addition, as the corrugated steel plate channel member 1 to which the water depth gauge 6 is attached, the corrugated steel plate channel member 1 for a straight portion shown in FIG. 3 is taken as an example.
Moreover, the attachment article attached by the welding part 5 is not restricted to a depth meter. The attached article may be, for example, an instrument such as a water thermometer or a thermometer, a water level monitoring camera, a surrounding monitoring camera, an information communication terminal, or a composite device thereof.

  The welding part 5 uses, for example, TIG butt welding. In TIG butt welding, base materials are butted together and an arc is generated between a non-consumable electrode and the base material. In TIG butt welding, the arc is used as a heat source, the filler rod and the base metal are melted, and an inert gas is allowed to flow around the melted portion. Thereby, in TIG butt welding, it welds, shielding a welding part from ambient air.

  In addition, the welding with respect to the welding part 5 is not restricted to TIG butt welding. For example, covering arc welding, TIG welding, MIG welding, mag welding, or the like may be used.

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

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

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

[Component Composition of Corrugated Steel Channel Member 1]
The steel material of the corrugated steel plate channel member 1 is stainless steel. The steel material is preferably ferritic stainless steel among stainless steel. 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 inevitable impurities, The following formula (1) is satisfied.
[Formula (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.

[Contrast between Example and Comparative Example]
FIG. 6 is a diagram showing an example and a comparative example of the corrugated steel sheet channel member 1 according to Embodiment 1 of the present invention.
The inventors of the present invention are Examples 1-3 in which the steel material of the corrugated steel plate 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 present invention example was compared with Comparative Example 1-3.
Example 1-3 is a steel material in which the steel material satisfies the composition of SUS443J1.
Example 4 is stainless steel whose steel material 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 plate HDZ45. In Comparative Example 2, the steel material is a galvanized steel plate HDZ55. In Comparative Example 3, the steel material is a hot-rolled steel plate.

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

  (1) Salt spray test on flat plate: A test specimen of 2 mm × 70 mm × 150 mm is tested for 5000 hours by spraying 5% NaCl in a 35 ° C. bath in accordance with JIS K 5600-7-1. It was. If the surface area after occurrence of red rust is less than 10%, ◎ (pass), 10% or more and less than 30%, ◯ (good), 30% or more and less than 50%, △ (unsuitable), 50% or more. If it was, it was judged as x (failed).

  (2) Salt spray cycle test on a welded material having a welded portion: Two test pieces of 2 mm × 35 mm × 150 mm were TIG welded in the longitudinal direction. The surface of the welded portion was subjected to a test after # 600 surface polishing. A test in which 5% NaCl was sprayed for 2 hours (35 ° C.) → drying (60 ° C., RH 30%) for 4 hours → wet (50 ° C., RH 95%) for 2 hours for one cycle was tested for 30 cycles. If the area ratio of red rust occurrence at the weld is less than 10%, ◎ (pass), 10% or more but less than 30%, ◯ (good), 30% or more but less than 50%, △ (unsuitable), 50% When it was above, it was determined as x (failed).

  (3) Magnetism: A normal ferrite magnet of 15 mmφ was brought close to it, and it was judged as ○ (good) when there was an attracting force, and x (failed) when there was no attracting force.

  (4) Initial introduction cost: ◎ (acceptable) if the cost is equal to or less than the conventional galvanized steel sheet HDZ45 as a purchase cost, ○ (possible) if it is more than 1 time and 1.75 times or less. When it was more than 75 times and less than 3 times, Δ (unsuitable) and over 3 times were judged as x (failure).

  (5) Life cycle cost (LCC): The total cost for 40 years, including the initial cost of installation, renewal including repair and maintenance costs, is 1/3 of the conventional galvanized steel sheet HDZ45. ◎ (passed) if it is below, ○ (possible) if it is more than 1/3 and less than 0.8 times, △ (unsuitable) if it is more than 0.8 times and less than 1 time, x ( ).

  As shown in FIG. 6, in the example of the present invention which is Example 1-3 of the present invention, the initial introduction cost of the corrugated steel channel member 1 is low, the corrosion resistance is improved in outdoor exposure, and partially under water exposure. An improvement in corrosion resistance was observed at the welds 5 performed. With these effects, the life cycle cost of the corrugated steel sheet channel member 1 which is basically two characteristics required as a synergistic effect can be more significantly reduced and the long-term durability is remarkably excellent. Therefore, it turns out that all the characteristics required for future waterway facilities can be improved.

[Effect of Embodiment 1]
According to the first embodiment, the corrugated steel plate channel member 1 uses a corrugated steel material having a corrugated cross section along the flow path direction. The corrugated steel 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 corrugated steel plate water channel member 1 can have a significantly increased life. Further, the corrugated steel plate waterway member 1 can greatly reduce maintenance management by repair, which is essential for conventional waterway members or concrete waterway structures. As a result, the life cycle cost of the corrugated steel sheet channel member 1 can be reduced.
Further, since the corrugated steel material of the corrugated steel plate 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 channel member 1 is stainless steel, the strength of the material is improved, and when used in a channel where water pressure is applied, the plate thickness can be reduced as compared with the plated steel plate. Further, the corrugated steel sheet channel member 1 can be drastically reduced in weight compared to a concrete channel structure or the like. As a result, the weight-reduced corrugated steel channel member 1 can improve the workability on soft ground, and can improve the transportation cost and the handling property.

According to Embodiment 1, the corrugated steel is ferritic stainless steel among stainless steel.
According to this configuration, since the corrugated steel material is ferritic stainless steel, the corrugated steel plate channel member 1 has magnetism. For this reason, the corrugated steel plate waterway member 1 can be moved or installed by being attracted by the action of magnetic force using an electromagnet heavy machine such as a lifting magnet working vehicle. As a result, it is possible to improve the handleability of the work in which the corrugated steel plate channel member 1 is constructed in the channel. Therefore, even if the number of young workers is reduced in the future, even if the number of workers is small, elderly or female, the construction work of the corrugated steel sheet channel member 1 can be easily performed, and the labor shortage has recently occurred. Matching properties are obtained.
Further, when the corrugated steel plate channel member 1 is disposed of in a large scale renovation of the water channel and mixed with concrete or a resin member, the corrugated steel plate channel member 1 having magnetism is a separator using an electromagnet or the like. It can be easily separated by attracting by the action of magnetic force. As a result, the corrugated steel plate channel member 1 can be separated and recycled from other objects, and characteristics suitable for environmental measures (separated waste recycling) can be obtained.

According to Embodiment 1, the corrugated steel is SUS443J1 among ferritic stainless steel.
According to this configuration, since the corrugated steel is SUS443J1, expensive Mo or the like is not added, the price of the material is stable, and the initial introduction cost is relatively low. Moreover, the corrugated steel channel member 1 is excellent in corrosion resistance when exposed outdoors. Moreover, it is excellent in the corrosion resistance in the welding part 5 in which the corrugated steel channel member 1 is partially performed. As a result, the wave, which is basically required as a synergistic effect by the low cost initial introduction cost of the corrugated steel channel member 1, the improvement of the corrosion resistance in outdoor exposure and the improvement of the corrosion resistance in the welded part 5. The life cycle cost of the steel plate channel member 1 can be significantly reduced, and the long-term durability is remarkably excellent. Therefore, all the characteristics required for future waterway facilities can be improved.

According to the first embodiment, the corrugated steel plate channel member 1 has the welded portion 5 to which the attachment article is attached.
According to this configuration, the corrugated steel plate waterway member 1 has the welded portion 5 that is welded to a mounting portion to which an attachment article such as a depth gauge is attached. Here, in the case of a plated steel plate, the welded portion is in a thin plating state and tends to corrode. Further, when the steel material is stainless steel such as SUS430, Cr carbide is generated in a welded portion heated to 600 ° C. to 800 ° C. during welding, a depletion layer having a Cr content of less than 12% is generated, and stress is generated. Sensitization occurs that increases the sensitivity to corrosion cracking. For this reason, the sensitized welded portion tends to be less durable than the non-welded portion. On the other hand, when the corrugated steel material is SUS443J1, the corrugated steel plate channel member 1 contains Ti as a component of SUS443J1, so that a weld layer 5 in which the Cr content is less than 12% hardly occurs even during welding. Sensitization can be suppressed. As a result, the corrugated steel channel member 1 has excellent corrosion resistance at the welded portion 5 and excellent long-term durability.

According to the first embodiment, the corrugated steel sheet channel member 1 is for a corner portion. The corrugated steel plate channel member 1 has an upstream part 1d and a downstream part 1e. The corrugated steel plate channel member 1 has a welded portion 5 that connects the upstream part 1d and the downstream part 1e.
According to this configuration, the welded part 5 that connects the upstream part 1d and the downstream part 1e has both side walls 1a, 1b and the bottom wall part 1c with respect to the flow path direction of the corrugated steel plate channel member 1. It has a welding region that is long welded to the upper end. And the welding part 5 which connects the upstream part 1d and the downstream part 1e is a part which is easy to corrode under the water exposure which contacts the water which flows directly through the corrugated-steel water channel member 1 for corner parts. On the other hand, since the corrugated steel channel member 1 for the corner portion contains Ti as a component of SUS443J1, it is possible to suppress the sensitization of the welded portion 5 that connects the upstream component 1d and the downstream component 1e. Therefore, the corrugated steel plate channel member 1 for a corner portion having a long weld area as the welded portion 5 is excellent in corrosion resistance in the welded portion 5 exposed to water, excellent in long-term durability, and corrugated steel plate for the corner portion. The life cycle cost of the water channel member 1 can be further reduced.

  It should be understood that the embodiment disclosed this time is illustrative in all respects and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

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

Claims (5)

A corrugated steel plate channel member using corrugated steel with a corrugated cross section along the flow path direction,
The corrugated steel is a corrugated steel channel member made of stainless steel.   The corrugated steel plate channel member according to claim 1, wherein the corrugated steel material is ferritic stainless steel among the stainless steel.   The corrugated steel sheet channel member according to claim 2, wherein the corrugated steel is SUS443J1 among the ferritic stainless steel.   The corrugated steel plate channel member according to claim 3, further comprising a welded portion to which the attachment article is attached. The corrugated steel plate channel member is for a corner portion, and has an upstream part and a downstream part,
The corrugated steel plate channel member according to claim 3, further comprising a welded portion that connects the upstream part and the downstream part.

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