JP2013174122A - Method for manufacturing free-access floor constituting member and free-access floor constituting member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a metal free-access floor constituting member having a strong rustproof force and having excellent corrosion resistance for surely and completely preventing the occurrence of rust due to a secular change and provide a metal free-access floor constituting member manufactured using the method.SOLUTION: A base plate 1, a pipe column 2, a fitting nut 3, a screw column 4, and a height control nut 6 or the like constituting a support leg A as a metal free-access floor constituting member are respectively worked by using metal raw materials such as steel materials, and then hot dip galvanizing treatment (rustproof treatment) is carried out to the base plate 1, the pipe column 2, the fitting unit 3, the screw column 4, and the height control unit 6, and a zinc plating coat (a) with predetermined film thickness t is adhered thereto.

Description

  The present invention relates to a method for manufacturing a metal free access floor component subjected to a corrosion-resistant plating process, and a metal free access floor component subjected to a plating process by the manufacturing method.

  For example, in rooms such as data centers, server rooms, and computer rooms where equipment such as large computers, server equipment, computer equipment, and telecommunications equipment is installed, heat from the equipment is extremely large, and enormous amounts are generated. Therefore, it is important to perform appropriate air-conditioning airflow control and wiring management. For that purpose, by using the underfloor space secured between the foundation floor by constructing a free access floor (double floor system) at a predetermined height on the foundation floor (floor slab) of the building. Appropriate air conditioning control and wiring management can be handled.

  By the way, the metal floor constituent members for constructing the free access floor are manufactured in a predetermined shape and size by mainly performing a cutting process or a press process using a metal material such as a steel material (steel plate). And in order to prevent generation | occurrence | production of the rust by a time-dependent change, it is necessary for a metal floor structural member to perform a corrosion-resistant plating process (rust prevention process).

  Thus, in the following Patent Documents 1 and 2, etc., steel panel floor panels (free access floor constituent members) manufactured using plated steel sheets have been proposed.

JP 2003-49528 A Japanese Patent No. 4172787

However, as described in Patent Document 1, when manufacturing a steel steel floor panel, conventionally, a cutting process for cutting a plated steel sheet (hot galvanized steel sheet in Patent Document 2) to a required size, and Steel floor panels are manufactured by processing such as bending (drawing), drilling, and joining by pressing. That is, in the floor panel made of steel plate manufactured by the conventional manufacturing method, the cut end (cut) is not covered with the plating film, and the background of the metal material is exposed. Moreover, the film thickness of the plating film is thinner than necessary at the bending portion (plastic working portion). In particular, thinning of the film thickness occurs in a portion where bending is strong.
Therefore, the steel panel floor panel manufactured by the conventional manufacturing method is used in the bending process part where the thickness of the cut end part and the plated film is unnecessarily thin. Cannot prevent the occurrence of rust caused by changes over time. In addition, in the bent portion, there is a problem with the original anticorrosion measures by the plating treatment such that the rust prevention effect is greatly reduced due to the destruction (breaking, chipping) of the plating film itself.

  The present invention has been devised to deal with such a problem as an example of the problem. That is, a method for producing a metal free access floor constituent member having strong corrosion resistance and having excellent corrosion resistance that can reliably and completely prevent the occurrence of rust due to aging, and a metal free access floor constituent member Is an object of the present invention.

In order to achieve such an object, the method for manufacturing a free access floor component and the free access floor component according to the present invention include at least the following configurations.
That is, the method for producing a free access floor constituent member of the present invention is a method for producing a metal free access floor constituent member,
The free access floor constituting member having a predetermined shape is processed with a metal material, and then the free access floor constituting member is subjected to hot dip galvanization with a predetermined film thickness.

  In addition, the free access floor constituent member of the present invention is a free access floor constituent member in which a predetermined shape of the free access floor constituent member is processed with a metal material, and then, the free access floor constituent member is subjected to hot dip galvanization with a predetermined film thickness. It is manufactured by a manufacturing method.

  Incidentally, as a free access floor constituent member according to the present invention, for example, steel support legs (support members) standing on the foundation floor (floor slab) of a building, and support legs adjacent in four directions are connected to each other. Steel stringers (leg connecting members) that are attached in a cross-linked manner, floor panels (floor materials) that are laid in a grid pattern with four corners mounted on the floor receiving pedestal of the support legs, etc. it can.

  The method for manufacturing a free access floor constituent member according to the present invention produces a free access floor constituent member having excellent corrosion resistance that has strong rust prevention ability and can reliably and completely prevent the occurrence of rust due to aging. be able to. As a result, it is possible to provide a metal free access floor constituent member that does not generate rust due to aging in the under floor space of the free access floor that is in a highly humid and corrosive environment.

  According to the free access floor constituting member according to the present invention, the rust preventive power is strong, and it has excellent corrosion resistance capable of reliably and completely preventing the occurrence of rust due to aging. Thereby, generation | occurrence | production of the rust by a time-dependent change can be completely prevented in use of the underfloor space etc. in the environment where humidity is high and is easy to corrode.

It is explanatory drawing of the support leg quoted as an example of the free access floor structural member which concerns on embodiment of this invention, and a part is broken and shown.

Hereinafter, the present invention will be described in detail. A method of manufacturing a free access floor component (hereinafter simply referred to as “floor component”) according to an embodiment of the present invention is applied to a metal material such as a steel material (steel plate) used for manufacturing a metal floor component. First, after processing into a predetermined shape by performing these processes such as cutting (pressing) or bending (plastic processing), cutting such as drilling or threading, joining by caulking or welding, etc. The final floor constituent member to be a finished product is obtained by subjecting the floor constituent member of the semi-finished product to surface plating treatment (rust prevention treatment) by hot dip galvanization.
Here, the surface plating treatment by hot dip galvanization is performed by sequentially performing a series of plating treatment steps such as degreasing → water washing → acid washing → water washing → flux treatment → drying → plating → cooling, as shown in FIG. A galvanized film a having a predetermined film thickness t is adhered to the surface of the floor constituent member shown in FIG.

And when performing hot dip galvanization with the manufacturing method which concerns on this embodiment, although the film thickness t of the galvanized film a is not specifically limited, It is preferable to set and manage in the range of 5-150 micrometers.
The reason is that when the film thickness t is 5 μm or less, the physical properties and corrosion resistance of the plating film are deteriorated (insufficient), and when the film thickness t is 150 μm or more, the cost increases and the screwed relationship between the female screw and the male screw (for example, 1, the screw strut 4 shown in FIG. 1 to be described later and the mounting nut 3 and the height adjusting nut 6 are screwed together). Because it is possible. Therefore, in this embodiment, the thickness t of the galvanized coating a is set and managed in a range of 5 to 150 μm, and a particularly preferable range is 10 to 100 μm.

  The setting management of the film thickness t can be performed by changing the dipping time in the plating tank in the plating process or the amount of wear (such as removal of scattered amount of attached plating).

Below, the specific example of the floor structural member which concerns on this embodiment manufactured by the said manufacturing method is demonstrated.
As a floor component, for example, a support leg (support member) erected on the foundation floor (floor slab) of a building, a steel stringer attached in a bridging manner so as to connect adjacent support legs in four directions (Leg spanning connecting member), floor panel (floor material) that is laid in a grid pattern with four corners mounted on the floor receiving pedestal of the support leg, etc., is shown in FIG. 1 in this embodiment. The support leg A will be described as an example.

FIG. 1 is an explanatory view of a support leg cited as an example of a floor constituent member, and a part thereof is broken away.
As is well known in the art, the support legs A are erected and arranged in a grid pattern at regular intervals on a foundation floor surface (floor slab) G such as concrete, so that a predetermined height above the foundation floor surface G is increased. The floor panel B for constructing a free access floor (double floor system) is mounted and supported at this position. This support leg A is basically composed of a combination of parts that are individually processed using a metal material such as steel as in the conventional case.
That is, as shown in FIG. 1, a steel base plate (fixed plate) 1 fixed to the foundation floor G by an adhesive or other means (not shown), and fixed to the center of the base plate 1 by welding or the like. A steel material that is vertically installed on the upper end side through a pipe support 2 made of steel standing vertically and a mounting nut 3 made of steel fixed to the upper end of the pipe support 2 so as to be vertically movable. A screw support 4 made of screws, a floor receiving pedestal 5 mounted on the upper half side of the screw support 4 and mounted on the four corners of the floor panel B, and a screw support 4 In addition, the height position of the floor receiving pedestal 5 is adjusted and a steel height adjusting nut 6 that supports the floor receiving pedestal 5 at the height position.

  And in this embodiment, in the support leg A which consists of such a structure, the baseplate 1 formed by processes, such as a cutting process using a steel board material, a drilling process, and a joining process, The steel pipe material Pipe strut 1 formed by cutting, joining and other processing using a screw, Screw strut 4 formed by threading, cutting, joining and other processing using a steel rod material, etc., mounting nut The member 3 and the height adjusting nut 6 are processed into predetermined dimensions and then subjected to surface plating treatment by hot dip galvanization to complete products. That is, after the hot dip galvanization is performed, as shown in FIG. 1, the support legs A that support and support the floor panel B at the predetermined height position above the foundation floor G are configured by assembling each other. Is.

Moreover, according to the manufacturing method of the support leg A which concerns on this embodiment, and the support leg A which the surface was manufactured by the hot dip galvanization process by the manufacturing method, it is completely that rust generate | occur | produces by the time-dependent change after plating process. Can be prevented.
In addition, in zinc electroplated products, zinc whiskers (single crystals that grow in the form of very long ridges from the plating surface to the outside) are generated, detached, and floated in the air due to the aging after plating. It is said that the residual compressive stress inside the plating film generated during electrogalvanization is influenced as a factor that causes zinc whiskers due to changes over time. However, in the hot dip galvanizing process, since the plating generation mechanism is different, the generation of zinc whiskers can be prevented.

The practicality of the present invention will be described below with reference to Examples 1 and 2 and Comparative Examples 1 and 2.
Example 1
Sample a (for example, steel plate floor) is formed by hot dip galvanizing treatment after forming by cutting such as hot rolled steel plate (SPHC plate thickness 1.2mm) and bending (drawing) by press molding. A panel back plate “bottom plate”) was produced.
(Example 2)
Sample b (for example, base plate of support leg) is formed by performing hot dip galvanization after forming by cutting using general structural rolled steel plate (SS400 plate thickness 3.2 mm) and punching by press molding. ) Was manufactured.
(Comparative Example 1)
Sample c (for example, the bottom plate “bottom plate” of a steel floor panel) by cutting using a hot-dip galvanized steel sheet (SGCD2 plate thickness 1.2 mm) that has been surface-plated in advance and bending (drawing) by press molding. ) Was manufactured.
(Comparative Example 2)
A sample d (for example, a base plate of a support leg) was manufactured by cutting using a hot-dip galvanized steel sheet (SGH400 plate thickness: 3.2 mm) that had been surface-plated in advance and punching by press molding.

And in this invention, the corrosion resistance test (rust prevention test) for confirming the presence or absence of corrosion generation | occurrence | production about Example 1 and 2 and Comparative Example 1 and 2 was done. The test conditions at this time were determined by visual confirmation by leaving the samples a to d produced in Examples 1 and 2 and Comparative Examples 1 and 2 in a salt spray atmosphere for 720 hours. It was evaluated by the contents of the stage. The results are shown in Table 1.
a. No corrosion: ○
b. Corrosion small: △
c. Corrosion large: ×

As is clear from Table 1, in Samples a and b of Examples 1 and 2, no corrosion was observed at all the evaluation positions, whereas in samples c and d of Comparative Examples 1 and 2, processing was performed. The occurrence of corrosion was observed at the evaluation positions of the bent portion (plastically processed portion) and the cut end portion (cut) / drilled portion (hole cut) except for the flat surface portion that was not.
Thereby, it turned out that the support leg A manufactured with the manufacturing method of this invention has strong rust prevention power and is excellent in corrosion resistance. In other words, in the underfloor space M (see FIG. 1) of the free access floor in a highly humid and corrosive environment, the manufacturing method of the support leg A that resists the occurrence of rust due to aging, and the hot dip galvanization by the manufacturing method Support legs A can be provided.

  Moreover, according to the support leg A manufactured by the manufacturing method of the present invention, by performing the hot dip galvanizing process, from the plating surface due to the residual compressive stress inside the plated film generated in the case of the electrogalvanized product. It can be expected that zinc whisker that grows in a cocoon-like shape when a single crystal is pushed out to the outside is generated, detached, and suspended in the air to prevent the occurrence of defects such as a short circuit in an electric circuit.

a Galvanized coating A Support legs (free access floor components)
1 Base plate 2 Pipe support 3 Mounting nut 4 Screw support 5 Floor support base 6 Height adjustment nut B Floor panel (free access floor component)

In order to achieve such an object, the method for manufacturing a free access floor component and the free access floor component according to the present invention include at least the following configurations.
The method for producing a free access floor constituting member of the present invention is a method for producing a metal free access floor constituting member,
The free access floor constituting member having a predetermined shape is processed by a metal material and threaded, and then the free access floor constituting member is subjected to hot dip galvanization with a predetermined film thickness of 5 to 150 μm .

In addition, the free access floor constituting member of the present invention has a predetermined film thickness of 5 to 150 μm on the free access floor constituting member after the free access floor constituting member having a predetermined shape is processed and threaded by a metal material. It is manufactured by the manufacturing method of the free access floor structural member which performs hot dip galvanization.

Claims (2)

A method for manufacturing a metal free access floor component,
A method of manufacturing a free access floor constituent member, comprising: processing the free access floor constituent member with a metal material, and then subjecting the free access floor constituent member to hot dip galvanization with a predetermined thickness.   A metal free access floor constituent member which is hot dip galvanized by the method for manufacturing a free access floor constituent member according to claim 1.

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