JP6877104B2 - Repair drainage drain - Google Patents

Description

The present invention relates to an aluminum material for repair drainage drainage, a plate-like structure for repair drainage drainage made of the aluminum material, and a method for manufacturing the same.

Drainage drains are usually provided on rooftops, flat roofs, corridors, balconies, etc. (hereinafter sometimes referred to as "rooftops, etc.") in order to collect rainwater that has fallen on the flat parts of buildings and drain it into gutters, etc. Has been done.

The drainage drain includes a drainage drain for vertical drainage that allows rainwater to flow into a gutter or the like provided under the rooftop, and a drainage for horizontal drainage that draws rainwater into a gutter or the like provided next to the rooftop or the like. There is a drain.

The drainage drain is usually made of a material such as cast iron, stainless steel or aluminum, and some of them are painted by baking finish or the like, and are fixed to the rooftop or the like by various methods.

However, with the passage of time, the drainage drain itself deteriorates, the contact area where the drainage drain is fixed to the rooftop, etc. is eroded, and rainwater does not flow normally to the tub, etc., or the drainage drain The area around the drain may become dirty, or water may leak from the corroded part of the drainage drain.

In order to repair such a deteriorated drainage drain and the vicinity of the drainage drain, for example, as disclosed in Patent Document 1, a repair drainage drain is widely used. FIG. 4 shows an example of the repair drainage drain. As shown in FIG. 4, the repair drainage drain 40 has a hole in the substantially central portion of the plate-shaped structure 42, and a hollow pipe 44 extends from the hole to one side of the plate-shaped structure 42. .. FIG. 3 shows a schematic cross-sectional view of the drainage drain base before the repair drainage drain is installed, and FIG. 5 shows a schematic cross-sectional view of the drainage drain base on which the repair drainage drain is installed. As shown in FIG. 5, the hollow pipe 44 is inserted into the existing drain pipe 50 of the drainage drain to be repaired, and the plate-shaped structure 42 is adapted to the shape of the existing drainage drain base 34 and brought into close contact with each other. The drainage drain can be repaired. Since the drainage drain base before the repair drain drain is installed has a flat portion 36 and a recessed portion 38, it is easily deformed to match the shape of the drain drain base 34 and adheres to the drainage drain base 34 (that is, the base followability is high). A shaped structure is required.

As the material of the plate-like structure of the repaired drainage drain, a material having low strength and easily plastically deformed so as to be in close contact with the shape of the drainage drain and its surroundings without a gap is preferable. Lead is used as the material for such repair drainage drains. Lead easily follows the drainage drain base by hitting it with a hammer or the like, so it is highly workable.

However, lead is a toxic metal, and when lead is used as a material for a plate-like structure, toxic lead ions may dissolve in rainwater in contact with lead, which may affect the environment. In addition, there is a problem that the worker may come into direct contact with lead during the construction of the repair drainage drain, which may pose a danger to the human body.

Under these circumstances, a new material that replaces lead is required as a material used for the plate-like structure of the repair drainage drain, and various materials have been proposed so far.

Patent Document 2 discloses a plate-like structure of a repair drainage drain containing an aluminum metal mesh and the aluminum metal mesh coated with rubber. However, the repair drain containing the aluminum metal mesh and the aluminum metal mesh coated with rubber is less likely to undergo plastic deformation as compared with the case where a metal plate is used, and the metal mesh has a complicated shape, so that the manufacturing process is complicated. There is the problem of complexity.

Patent Document 3 discloses a plate-like structure of a repair drainage drain using copper. However, since copper has a considerably higher strength (for example, tensile strength) than lead, there is a problem that it lacks flexibility and it is difficult to bring it into close contact with the repaired part of the drainage drain during construction.

Patent Document 4 discloses a structure in which industrial pure aluminum is used as the plate-like structure of the repair drainage drain. However, since industrial pure aluminum has considerably higher strength than lead, it has insufficient flexibility, and there is a problem that it is difficult to make it adhere to the shape around the drainage drain during construction.

Japanese Unexamined Patent Publication No. 2014-101634 Japanese Unexamined Patent Publication No. 2012-202048 Utility Model Registration No. 3090951 Japanese Unexamined Patent Publication No. 2015-559333

As described above, various materials have been proposed as materials used for the plate-like structure of the repair drainage drain. However, since all the materials are significantly inferior in flexibility (toughness, ductility, etc.) to the conventionally used lead, the base followability (that is, workability) is significantly inferior, and the repair drainage drain plate It was insufficient as a substitute material for lead used as a structure.

Therefore, an object of the present invention is to provide a lead alternative material which can be suitably used as a material for a plate-like structure of a repair drainage drain, has sufficiently excellent flexibility, and is excellent in workability. And.

Aspect 1 of the present invention is an aluminum material for repair drainage drainage in which the total content of Fe, Si and Cu is 0.01% by mass or less, and the balance is Al and unavoidable impurity elements.

Aspect 2 of the present invention is the aluminum material according to Aspect 1, which is a tempering treatment material tempered into an O material.

Aspect 3 of the present invention is a plate-like structure for repair drainage drain made of the aluminum material according to Aspect 1 or 2.

Aspect 4 of the present invention is the plate-like structure according to Aspect 3, which has a plate thickness of 0.3 to 2 mm.

Aspect 5 of the present invention comprises a step of producing a rolled material in which the total content of Fe, Si and Cu is 0.01% by mass or less, and the balance is Al and an aluminum material which is an unavoidable impurity element, and the rolling. It is a method for manufacturing a plate-like structure for repair drainage drainage, which includes a rolling process for rolling a material.

Aspect 6 of the present invention is the method for producing a plate-like structure according to Aspect 5, further comprising an annealing step of holding at a temperature of 300 to 600 ° C. after the rolling step.

According to the present invention, it is possible to provide a lead alternative material which can be suitably used as a material for a plate-like structure of a repair drainage drain, has sufficiently excellent flexibility, and is excellent in workability. ..
Further, according to the present invention, it is possible to provide a plate-shaped structure for repair drainage drain, which has sufficiently excellent flexibility and excellent workability, and a method for manufacturing the same.

FIG. 1 is a schematic view showing a simulated jig and a test piece used in the examples. FIG. 2 is a diagram showing a portion A in FIG. FIG. 3 is a schematic cross-sectional view showing an example of a drainage drain base. FIG. 4 is a schematic perspective view showing an example of the repair drainage drain. FIG. 5 is a schematic cross-sectional view showing an example of a state in which the hollow pipe of the repair drainage drain is inserted into the inside of the drainage drain pipe.

The present invention focuses on the flexibility of high-purity aluminum.

Conventionally, it has been proposed that industrial pure aluminum is applied as a plate-like structure of a repair drainage drain. However, since such industrial pure aluminum is produced by an electrolysis method such as the Hall-Héroult method, the purity is usually about 99% by mass, that is, it contains an impurity element close to 1% by mass. For example, the purity of the JIS standard alloy number A1100 is about 99% by mass, and the purity of A1050 is about 99.5% by mass.
In addition, in the mass percent notation indicating purity, N, which is an acronym for nine, is added after the number of 9s consecutive from the beginning, for example, 99.99 mass% of purity is described as "4N", and is referred to as "four nines". I may call it. Aluminum with a purity of 4N may be labeled as "4N-Al".

Pure aluminum having a purity of about 99% by mass usually contains about 0.1% by mass or more of Fe and about 0.05% by mass or more of Si as impurities.

As described above, when repairing the deteriorated drainage drain, the repair drainage drain is deformed and used so that the repair drainage drain is in close contact with the shape of the drainage drain and its surroundings without any gap. Industrial pure aluminum with a purity of about 99% by mass has high strength because it contains a large amount of impurity elements, and can be used for tapping with a hammer, etc. in the case of a plate material with a thickness of 0.3 mm or more required for repair drainage drainage. It is difficult to follow the groundwork. Furthermore, even when O material (annealed material), which has low strength among industrial pure aluminum, is used, it is difficult to deform because it has higher strength than lead, and the strength tends to increase due to work hardening. It was difficult to plastically deform it to follow the drain base. Therefore, we focused on the need for a material that has low strength, high plastic deformability, and is difficult to work harden.

As a result of diligent studies, the present inventors have found that the above problems can be solved by using a high-purity aluminum material having a purity of 99.99% by mass or more (4N or more) as a material for the plate-like structure of the repair drainage drain. I found it.
That is, by controlling the total content of Fe, Si and Cu contained in the aluminum material to 0.01% by mass or less, the strength of the aluminum material is suppressed, plastic deformation is facilitated, and the strength is increased by work hardening. Can be less likely to occur. Therefore, when such a high-purity aluminum material is used as a material for the plate-shaped structure of the repair drainage drain, if the plate-shaped structure is deformed according to the shape of the repaired part, it can be sufficiently plastically deformed. They have found that it is possible to provide a repair drainage drain that can be easily adhered to the shape of the repaired part and has excellent workability.

Hereinafter, an aluminum material for repair drainage drain according to an embodiment of the present invention, a plate-like structure for repair drainage drain made of the aluminum material, and a method for manufacturing the same will be described.

1. 1. Aluminum material for repair drainage drain The aluminum material for repair drainage according to the embodiment of the present invention has a total content of Fe, Si and Cu of 0.01% by mass or less, and the balance is Al and unavoidable impurity elements. .. By limiting the total content of Fe, Si and Cu to 0.01% by mass or less, the strength of the aluminum material can be suppressed to a low level, plastic deformation can be facilitated, and strength improvement due to work hardening can be suppressed. Therefore, when the aluminum material according to the embodiment of the present invention is used as the material for the plate-shaped structure of the repair drainage drain, it is possible to suppress a decrease in flexibility due to work hardening of the plate-shaped structure. The structure can be easily constructed so as to be in close contact with the shape of the repaired part of the drainage drain.

The aluminum material for repair drainage drain according to the embodiment of the present invention preferably has a total content of Fe, Si and Cu of 0.001% by mass or less. More preferably, in the aluminum material for repair drainage drain according to the embodiment of the present invention, the total content of Fe, Si and Cu is 0.0001% by mass or less.
By further limiting the total content of the impurity elements Fe, Si and Cu, the strength of the aluminum material can be made smaller, plastic deformation can be made easier, and work hardening can be further suppressed. When the aluminum material according to the above is used as a material for the plate-like structure of the repair drainage drain, the workability of the repair drainage drain can be further improved.

The mechanism by which the higher the purity of aluminum is, the more the strength improvement due to work hardening can be suppressed is not clear, but it is speculated as follows. That is, in the case of a general metal having a high impurity concentration, when crystal defects called dislocations are introduced during processing, the movement of dislocations is suppressed (that is, pinned) by the impurity element and accumulated, and dislocations occur. Becomes difficult to move, that is, work hardening. On the other hand, when the purity of aluminum is 99.99% by mass or more, the amount of impurity elements is significantly smaller than that of general metals, so that the effect of suppressing (pinning) the movement of dislocations by the impurity elements is small. Therefore, it is considered that work hardening is unlikely to occur.

Further, the aluminum material for repair drainage drain according to the embodiment of the present invention has flexibility due to work hardening because the total content of the impurity elements Fe, Si and Cu is limited to 0.01% by mass or less. In addition to being able to suppress the decrease in corrosion resistance, it is possible to have excellent corrosion resistance. Therefore, when the aluminum material for the repair drainage drain according to the embodiment of the present invention is used as the material of the plate-like structure of the repair drainage drain, it is less likely to deteriorate even when exposed to rainwater for a long time. Such an effect of improving corrosion resistance can be more remarkablely exhibited by further limiting the total content of the impurity elements Fe, Si and Cu. Therefore, in order to obtain the effect of corrosion resistance, the total content of Fe, Si and Cu is more preferably 0.001% by mass or less, further preferably 0.0001% by mass or less.

In one preferred embodiment, the balance is Al and unavoidable impurity elements. Examples of the unavoidable impurity element include trace elements (for example, Mn, Mg, Ti, B, Cr, Ga, Ni, V, Zn, Zr, etc.) brought in depending on the conditions of raw materials, materials, manufacturing equipment, and the like. The aluminum material according to the present invention preferably has a total content of unavoidable impurity elements of 0.01% by mass or less. It is more preferably 0.001% by mass or less, still more preferably 0.0001% by mass or less.

The concentration of impurity elements in aluminum containing Fe, Si and Cu can be measured, for example, by solid-state emission spectrum analysis. It can also be measured by mass spectrometry such as glow discharge mass spectrometry (GD-MS).

The aluminum material for repair drainage drain according to the embodiment of the present invention is preferably a tempering treatment material tempered to an O material. "Trained to O material" means annealed state to obtain the softest state as specified in JIS H 0001: 1998. In such a form, the processing strain introduced in the rolling process at the time of manufacturing is alleviated and the flexibility is improved. Therefore, when the aluminum material is used as the material of the plate-like structure of the repair drainage drain, the plate-like structure is used. It becomes easier for the body to adhere to the shape of the repaired part of the drainage drain, and the workability of the repaired drainage drain can be further improved.

2. Plate-shaped structure for repaired drainage drain Another preferred embodiment of the present invention is a plate-shaped structure for repaired drainage drain made of an aluminum material having the above-mentioned composition. In the case of such a plate-shaped structure for repair drainage drainage, if the plate-shaped structure is deformed according to the shape of the repaired part, it can be sufficiently plastically deformed and easily adhered to the shape of the repaired part. It is possible to provide a repair drainage drain that can be made to work and has excellent workability.

If the plate-like structure for repair drainage drain according to the embodiment of the present invention is too small in thickness, the plate-like structure may be damaged during construction, and water leakage due to corrosion due to rainwater or the like is likely to occur. Therefore, the plate thickness is preferably 0.3 mm or more, more preferably 0.5 mm or more, still more preferably 0.7 mm or more. On the other hand, if the plate thickness is too large, the flexibility may decrease and the workability may deteriorate. Therefore, the plate thickness is preferably 2 mm or less, more preferably 1.2 mm or less, still more preferably 1.0 mm or less.

3. 3. Manufacturing method of plate-shaped structure for repair drainage drain

The method for producing a plate-shaped structure for repair drainage drain according to the present invention includes, for example, a rolling material manufacturing step and a rolling step. Hereinafter, each of these steps will be described.

(Rolling material manufacturing process)
The rolling material manufacturing step is a step of obtaining a rolled material in which the total content of Fe, Si and Cu is 0.01% by mass or less, and the balance is Al and an aluminum material which is an unavoidable impurity element.

A rolled material made of an aluminum material having the above-mentioned composition can be obtained by, for example, the following method. That is, an ingot having a predetermined shape is produced from the molten metal dissolved in the high-purity aluminum obtained by the refining method described later while suppressing the invasion of impurities. After that, a rolled material can be obtained by cutting the ingot into a predetermined shape. The method for producing the rolled material is not limited to the above-mentioned method, and conventionally known methods (for example, die casting, extrusion, etc.) may be used. Further, a step of heat-treating the rolled material (homogenization heat treatment step) may be included.

Examples of the method for purifying high-purity aluminum include a segregation method and a three-layer electrolysis method.

The segregation method is a purification method that utilizes the segregation phenomenon during solidification of molten aluminum, and a plurality of methods have been put into practical use. One form of the segregation method is to pour molten aluminum into the container, heat the molten aluminum at the top while rotating the container, and solidify the purified aluminum from the bottom while stirring. High-purity aluminum having a purity of 99.99% by mass or more can be obtained by the segregation method.

In the three-layer electrolysis method, pure aluminum or the like having a relatively low purity (for example, a grade of JIS-H2102 having a purity of 99.9% by mass) is added to the Al—Cu alloy layer to form an anode in a molten state. This is a method in which an electrolytic bath containing, for example, aluminum fluoride and barium fluoride is placed on the electrolytic bath to deposit high-purity aluminum on the anode.
By the three-layer electrolysis method, high-purity aluminum having a purity of 99.999% by mass or more can be obtained. Further, the concentration of Fe in aluminum can be relatively easily suppressed to 10 mass ppm (0.001 mass%) or less.

The method for producing high-purity aluminum is not limited to the segregation method and the three-layer electrolysis method, and other methods already known such as a band melt purification method and an ultra-high vacuum dissolution purification method may be used.

(Rolling process)
The rolling step is a step of rolling the obtained rolled material, for example, a step of rolling with a rolling processing rate of 90% or more. The rolling processing ratio referred to here is the value obtained by subtracting the thickness of the final plate obtained by rolling from the thickness of the rolled material (that is, the thickness before rolling) (that is, the thickness reduced by rolling). It is the percentage of the value divided by the thickness of the material, and is based on the following equation:
Rolling rate (%) = [(Thickness before rolling-Thickness after rolling) ÷ Thickness before rolling] x 100
Is calculated by. For example, if a rolled material having a thickness of 10 mm is rolled into a plate material having a thickness of 1 mm, the rolling processing rate is 90%.

It is preferable that the rolled material is rolled a plurality of times to obtain the final plate thickness. The higher the rolling process rate, the higher the production efficiency in many cases. Therefore, the rolling process rate is preferably 90% or more. Since the higher the rolling rate is, the more preferable it is, no upper limit is set.

The rolling method may be either cold rolling or hot rolling. Hot rolling and cold rolling can be combined. For example, among the rolling processes performed a plurality of times, the initial stage may be hot rolling and the latter half may be cold rolling.

(Annealing process)
In a preferred embodiment, the rolled material obtained in the rolling step may be further annealed. The annealing step is a step of performing finish annealing at a temperature of 300 to 600 ° C. for 1 to 24 hours after the rolling step. By setting the final annealing temperature to 300 ° C. or higher, a plate-like structure for repair drainage drain having more excellent flexibility can be obtained. On the other hand, by setting the temperature to 600 ° C. or lower, sticking of the rolled materials to each other during annealing can be suppressed, and a plate-like structure for repair drainage drain with good appearance quality can be obtained. Therefore, the annealing temperature is preferably 300 to 600 ° C. Further, by setting the annealing time to 1 hour or more, a plate-like structure for repair drainage drain having more excellent flexibility can be obtained. Even if the annealing time is lengthened, there is no problem in characteristics, but from the viewpoint of cost, up to about 24 hours is sufficient. Therefore, the annealing time is preferably 1 to 24 hours.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the Examples.

1. 1. Base followability test (1) Preparation of test piece A rolled material made of high-purity aluminum (4N-Al, 5N-Al, 6N-Al) was prepared for the test of the example, and a plate material was prepared from the rolled material obtained by rolling. Was cut out. For the test of the comparative example, a rolled material made of pure aluminum having a purity of about 99.9% by mass was prepared, and a plate material was cut out from the rolled material obtained by rolling. Two types were prepared, one was a plate material that was heat-treated at 430 ° C. for 7 hours to form an O material, and the other was a plate material that was not heat-treated after rolling. For the test of the comparative example, as commercially available pure aluminum (aluminum widely available), a plate material of A1100 (purity of about 99% by mass) of quality H14 and A1050 (purity of about 99.5%) of quality H24. The board material was prepared. A part of the above-mentioned plate material was heat-treated at 350 ° C. for 3 hours to prepare an O material plate material. As a comparative material, a commercially available high-purity copper (copper purity of about 99.96%) plate material was prepared. As a test piece of a reference example, a commercially available high-purity lead (lead purity of about 99.99% by mass) plate material was prepared. Table 1 shows a list of prepared test pieces. For high-purity aluminum materials having a purity other than 6N, the contents of Fe, Si and Cu were measured by solid-state emission spectroscopy. The contents of Fe, Si and Cu thus obtained and the total value of these three elements are shown in Table 1. For aluminum with a purity of 6N, some elements were below the lower limit of quantification in solid-state emission spectroscopic analysis, so the results measured by glow discharge mass spectrometry (GD-MS) are shown. The amount of unavoidable impurities (Mn, Mg, Ti, B, Cr, Ga, Ni, V, Zn, Zr) contained in the high-purity aluminum material used is 0.003% by mass or less for 4N-Al and 5N. -Al is 0.0003% by mass or less, and 6N-Al is 0.00002% by mass or less.

In the test pieces of Examples 1 to 18, the above-mentioned high-purity aluminum material was rolled, and a plate material was cut out from the obtained rolled material, and the size was 50 mm in width × 300 mm in length and 0.5 mm in thickness. It was set to 8 mm or 1.0 mm.
The size of the test pieces of Comparative Examples 1 to 6 and 13 to 15 and Reference Examples 1 to 2 was 50 mm in width × 300 mm in length and 0.5 mm, 0.8 mm or 1.0 mm in thickness.
The test pieces of Comparative Examples 7 to 12 were obtained by rolling a rolled material made of pure aluminum having a purity of about 99.9% by mass, cutting out a plate material from the obtained rolled material, and measuring 50 mm in width × 300 mm in length. The thickness was adjusted to 0.5 mm, 0.8 mm or 1.0 mm.

(2) Preparation of simulated jig for evaluation As shown in FIG. 1, a hard metal block (material name A5052 alloy) having a length of 250 mm, a width of 250 mm, and a height of 50 mm is prepared, and the maximum depth is within a range of approximately φ200 mm at the center of the upper surface. A 10 mm recess 12 was provided, and an evaluation simulation jig 10 imitating a drainage drain base was produced. The recess 12 provided in the evaluation simulation jig 10 is made to be a part of a spherical surface having a radius of curvature of about 505 mm.

(3) Evaluation of Deformability and Repulsion Height A test piece fastener 14 is provided at the end of the upper surface of the evaluation simulation jig, and the test piece 20 prepared in (1) is placed on the upper surface 16 of the evaluation simulation jig 10. One end of the test piece 20 was fixed to the fastener 14 so as to be parallel to each other.
Subsequently, with respect to the installed test piece 20, the area of the recess 12 when viewed from above is squeezed from above with a hammer (head diameter: 32 mm, head weight: about 700 g, total length: 370 mm) 120 times per minute for 2 minutes. By tapping (240 times in total), the test piece 20 was made to follow the surface of the recess 12 of the evaluation simulation jig 10. When swinging up the hammer head, the height of the hammer head should be within a range of 10 to 20 cm from the upper surface 16 of the simulated jig 10, and the hammer head should be swung down by its own weight. It was performed by using it, and one end of the test piece on the side not fixed by the fastener 14 was hit with a hammer while being lightly pressed downward by a hand without a hammer.

As an evaluation of the deformability, after hitting 240 times, it is visually observed that the test piece follows the dent well with one end of the test piece on the side not fixed by the fastener 14 being lightly pressed downward. Good (○), the test piece does not completely follow the dent, but there is a problem that it is visually recognized that it partially follows (△), and the test piece completely follows the dent. Those that did not were evaluated as defective (x).
As an evaluation of the repulsion height, after hitting 240 times, the jumping distance from the upper surface 16 of the evaluation simulation jig 10 at the other end of the test piece (that is, the side opposite to the side where the fastener is installed). (Height h shown in FIG. 2) was measured and evaluated as the repulsion height. It is considered that the smaller the repulsion height, the easier it is for the test piece to undergo plastic deformation or to follow the substrate.
When the deformability is ◯ and the repulsion height is small, it can be evaluated that the base followability is good and the workability is good.

For the test pieces having good deformability (◯) and a repulsion height of 26 mm or less, the overall quality was evaluated as ○ (that is, good ground followability). For the other test pieces, the overall quality was marked with x (that is, the ground followability was poor). The results are shown in Table 1.

In the test piece having poor deformability (x), the repulsion height became a small value when the plate material was hardly deformed, and the repulsion height became large when the plate material was deformed to some extent. From this, it was found that the measured value of the repulsion height did not reflect the groundwork followability (workability) in the test piece having poor deformability (x), but rather showed the opposite tendency. Therefore, it is considered that the repulsion height is not appropriate for the evaluation of the base followability (workability) in the test piece having poor deformability (x), and it is described as no valid data (-) in Table 1.
For a test piece whose deformability is problematic (Δ), the measured value of the repulsion height may not reflect the ground followability (workability) for the same reason as when the deformability is poor (×). Since it was considered, it is shown in parentheses in Table 1 as a reference value.

As can be seen from Table 1, all of Examples 1 to 18 using the test piece made of high-purity aluminum having a total content of Fe, Si and Cu of 0.01% by mass or less have good deformability. Yes, and the repulsion height was within 26 mm, and the overall quality was good.
Comparing Example 1 and Example 2 using a test piece made of high-purity aluminum having a purity of 4N class and having a total content of Fe, Si and Cu of 0.01% by mass or less, it is adjusted to O material. In Example 2 using the quality (completely annealed) tempered material, the repulsion height was lower and the substrate followability was improved as compared with Example 1 in which the complete annealing treatment was not performed.
When using a test piece made of high-purity aluminum of 5N class in which the total content of Fe, Si and Cu is 0.001% by mass or less and 6N class in which the total content is 0.0001% by mass or less, compared to the case of 4N class. However, the repulsion height was further reduced, and the ground followability (workability) was further improved.

On the other hand, Comparative Examples 1 and 3 using a test piece made of pure aluminum (classification H14 or H24) having a total content of Fe, Si and Cu of more than 0.01% by mass and a purity of about 99% by mass are shown. , Deformability was poor (x). Comparative Examples 2 and 4 using the test piece, which is a tempered material obtained by tempering pure aluminum into an O material, showed improvement in deformability, but had a problem (Δ).
Comparative Examples 7 to 12 using the test made of pure aluminum having a total content of Fe, Si and Cu of more than 0.01% by mass and a purity of about 99.9% by mass are for H material (Comparative Example). In the case of 7, 9 and 11), the deformability was poor (x), and in the case of the O material (Comparative Examples 8, 10 and 12), the deformability was problematic (Δ).

2. Corrosion resistance test As a corrosion resistance test, the material is high-purity lead (lead purity about 99.99%), high-purity copper (JIS standard number C1020, copper purity about 99.96%), aluminum alloy (JIS standard alloy number A5052). Four samples each composed of H material)) and high-purity aluminum (5N-Al, H material) were prepared, and a immersion dissolution test was performed on each sample. The actual usage environment of the repaired drainage drain is considered to be affected by various factors such as the construction area, construction site (surrounding environment), and season, and there are multiple possible corrosion resistance evaluation conditions. Therefore, this time, the evaluation was made under the following conditions. The procedure was carried out under the condition of immersing in a 3.5 mass% NaCl aqueous solution at 30 ° C. adjusted to pH 3 with acetic acid for 72 hours. After the test, the corrosion weight loss after removing the corrosion products was measured, and the erosion rate was calculated from the value assuming uniform corrosion over the entire surface. The results of the corrosion resistance test are shown in Table 2.

As can be seen from the results in Table 2, high-purity aluminum has an erosion rate of about one-fourth that of lead, which has been conventionally used as a material for the plate-like structure of the repair drainage drain, and is high-purity aluminum. Is considered to have better corrosion resistance than lead.

10: Simulation jig for evaluation 12: Depression 14: Test piece Fastener 16: Top surface 20: Test piece 32: Drainage port 34: Drainage drain base 36: Drainage drain base flat part 38: Drainage drain base dent part 40: Repair drainage Drain 42: Plate-like structure 44: Hollow pipe 50: Existing drain pipe

Claims (3)

A repair drainage drain containing a plate-like structure in which the total content of Fe, Si and Cu is 0.01 % by mass or less, and the balance is made of an aluminum material which is Al and an unavoidable impurity element. The repair drainage drain according to claim 1, wherein the aluminum material is a heat-treated material prepared into an O material. The repair drainage drain according to claim 1 or 2 , wherein the plate-like structure has a plate thickness of 0.3 to 2 mm.

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