Plate thickness confirmation jig and plate thickness confirmation method

Abstract

To provide a jig for easily confirming respective plate thicknesses of a plurality of square steel pipes having different plate thicknesses, and a plate thickness confirmation method using the jig.SOLUTION: A plate thickness confirmation jig 10 is a plate-like jig used for confirming plate thicknesses of square steel pipes, and has a plurality of notch parts 12 provided on an outer edge part of the jig, wherein each of the plurality of notch parts 12 has bow-shaped curved surfaces 14 brought into contact with the corner parts of the square steel pipes, the curved surfaces 14 have curvatures to fit to the corner parts when the curved surfaces 14 are brought into contact with the corner parts of the square steel pipes, and the plurality of notch parts 12 includes a first notch part having a curved surface 14 having a curvature to fit to the corner part of a first square steel pipe, and a second notch part having the curved surface 14 having a curvature to fit to the corner part of a second square steel pipe having plat thickness different from that of the first square steel pipe.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a plate thickness checking jig and a plate thickness checking method, and more particularly to a jig and a plate thickness checking method used when checking the plate thickness of a structural square steel pipe. [Background technology]

[0002] Conventionally, square steel pipes have been used as architectural steel frame column members (hereinafter simply referred to as column members), but there have been many problems during construction work where square steel pipes with a different plate thickness than the one that should be used are mistakenly used. Therefore, it is important to check the plate thickness of square steel pipes used as column members at construction work sites. Therefore, tools and technologies for checking the plate thickness of steel pipes have been developed (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-138301 A Summary of the Invention [Problem to be solved by the invention]

[0004] When checking the thickness of a square steel pipe, the cross section of the pipe can be seen before the pipe is processed or assembled, so the thickness can be checked visually. However, once the pipe is assembled and, for example, a base plate or a diaphragm is attached to the end face of the pipe, the end face becomes covered by the plate and cannot be seen, so the thickness cannot be checked visually.

[0005] One method for checking the thickness of a square steel pipe with a plate material fixed to its end face is to use a plate thickness measuring device that uses ultrasonic waves, but such a measuring device is very expensive and is usually difficult to use at construction sites. Therefore, from the perspective of the effort and cost involved in the measurement work, there is a demand for a tool that can easily check the plate thickness of a square steel pipe at construction sites and that can be used easily.

[0006] Moreover, it is preferable for the above-mentioned tool to be versatile. More specifically, there is a demand for a tool that can easily check the thickness of various rectangular steel pipes having different thicknesses.

[0007] Therefore, the present invention has been made in consideration of the above-mentioned problems, and its object is to provide a jig for easily checking the plate thickness of each of multiple square steel pipes having different plate thicknesses, and a plate thickness checking method using said jig. [Means for solving the problem]

[0008] The above-mentioned problems are solved by the plate thickness checking jig of the present invention, which is a plate-shaped jig used to check the plate thickness of rectangular cylindrical steel material, the jig having a plurality of cutout portions provided on the outer edge portion of the jig, each of the plurality of cutout portions having an arched curved surface that abuts against a corner portion of the steel material, the curved surface having a curvature that fits with the corner portion of the steel material when the curved surface abuts against the corner portion, and the plurality of cutout portions including a first cutout portion having a curved surface with a curvature that fits with the corner portion of a first steel material, and a second cutout portion having a curved surface with a curvature that fits with the corner portion of a second steel material having a plate thickness different from that of the first steel material.

[0009] In the plate thickness checking jig of the present invention configured as described above, the plate thickness of a rectangular cylindrical steel material can be checked by abutting the cutout portion against the corner of the rectangular cylindrical steel material (more specifically, by abutting the curved surface of the cutout portion). This makes it easy to check whether the rectangular cylindrical steel material has the plate thickness that it should originally be used with. Furthermore, according to the present invention, a single jig can be used to check the plate thickness of each of a plurality of steel materials of different types (more specifically, plate thicknesses).

[0010] In the above-described plate thickness checking jig, it is preferable that the plurality of cutout portions are provided at the outer edge portion with a gap between the cutout portions. According to the above configuration, since there is a gap between the cutouts, the difference in curvature between the first cutout and the second cutout can be easily confirmed, and therefore the cutout to be used (i.e. the cutout corresponding to the steel material whose plate thickness is to be confirmed) can be correctly selected.

[0011] In the above-described plate thickness checking jig, it is preferable that non-notched portions having straight outer edge lines are provided between the notched portions in the outer edge portion. According to the above configuration, since the non-notched portion has a straight outer edge, there is no sharp edge that would occur if the notched portion were provided continuously. As a result, when checking the thickness of a steel material using the jig of the present invention, it is possible to avoid problems such as scratching the steel material with a sharp edge or injuring a finger by touching it.

[0012] In addition, in the above-mentioned plate thickness confirmation jig, three or more cutout portions having different curvatures of the curved surface are provided on the outer edge portion of the jig as a plurality of cutout portions, and it is preferable that the curved surface of each of the three or more cutout portions has a curvature that fits with a corner portion of a corresponding steel material among multiple types of steel materials having different plate thicknesses. According to the above configuration, the plate thicknesses of a plurality of steel materials can be checked using one jig, improving the versatility of the jig.

[0013] Furthermore, in the above-mentioned plate thickness confirmation jig, it is preferable that the curvature of the curved surface of one of the three or more cutout portions is smaller than either of the curvatures of the curved surfaces of two cutout portions that are adjacent to the one cutout portion in the outer edge portion and are provided at positions that sandwich the one cutout portion, or that the curvature of the curved surfaces of the two cutout portions is larger than either of the curvatures of the curved surfaces of the two cutout portions. According to the above-mentioned configuration, since it is easy to visually confirm the difference in the curvature of the curved surface of each cutout portion, it is possible to prevent misidentification of the curvature of the cutout portion to be used. Also, according to the above-mentioned configuration, the size of the jig can be further reduced.

[0014] Furthermore, in the above-mentioned plate thickness confirmation jig, it is preferable that a portion of the jig corresponding to the first cutout portion indicates first information regarding the plate thickness of the first steel material, and a portion of the jig corresponding to the second cutout portion indicates second information regarding the plate thickness of the second steel material. According to the above configuration, by referring to the first information and the second information, it is possible to easily grasp the plate thickness of the steel material having corners that fit into the curved surfaces of each cutout portion.

[0015] Furthermore, in the above-mentioned plate thickness confirmation jig, it is preferable that a first punched-out portion indicating first information is formed in a portion of the jig corresponding to the first cut-out portion, and a second punched-out portion indicating second information is formed in a portion of the jig corresponding to the second cut-out portion. According to the above configuration, it is possible to prevent information relating to each cutout portion and the corresponding plate thickness from being erased due to aging, friction, and the like of the jig.

[0016] In addition, the above-mentioned problem is solved by the plate thickness confirmation method of the present invention, in which the plate thickness of a rectangular tube-shaped steel material is confirmed using the plate thickness confirmation jig as described above. According to the above-mentioned plate thickness checking method, the plate thickness of a rectangular tubular steel material can be easily checked by simply placing the curved portion of the jig against the corner of the rectangular tubular steel material. Also, according to the above-mentioned plate thickness checking method, the plate thickness of each of a plurality of steel materials with different plate thicknesses can be checked with one jig. Effect of the Invention

[0017] According to the plate thickness checking jig and plate thickness checking method of the present invention, the plate thickness of each of a plurality of square steel pipes having different plate thicknesses can be easily checked. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram showing a plate thickness confirmation jig according to an embodiment of the present invention. [Diagram 2] FIG. 13 is a diagram showing a plate thickness confirmation jig according to a reference example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] <<About a plate thickness confirmation jig according to one embodiment of the present invention>> Hereinafter, a plate thickness checking jig (hereinafter simply referred to as a jig) according to one embodiment of the present invention (hereinafter simply referred to as this embodiment) will be described with reference to the accompanying drawings. In the drawings, each component is shown somewhat simplified and schematic to make the explanation easier to understand, and the size (dimension) of each component and the interval between components shown in the drawings are different from the actual ones.

[0020] The jig according to this embodiment is used to check the plate thickness of square cylindrical steel materials used in the construction of houses and other buildings, and more specifically, is used to check the plate thickness of square steel pipes.

[0021] In this specification, "square steel pipe" refers to a square cylindrical steel material of a standard size. For example, the radius of curvature R of the outer surface of the corner of a square steel pipe manufactured by a method for obtaining square steel pipes by press forming (the BCP method) is specified to be 3.5 times the plate thickness t.

[0022] The jig 10 according to this embodiment is formed by cutting a metal plate into a predetermined shape and has a size that can be held by a person with one hand. The jig 10 has a plurality of cutouts 12 on its outer edge, and each cutout is an arc-shaped cutout with a central angle of less than 90 degrees, more specifically, 30 to 60 degrees. The jig 10 according to this embodiment is produced, for example, by cutting the periphery of a metal plate into a pentagonal shape and cutting each apex angle into an arc shape. That is, in this embodiment, a jig 10 having five cutout portions 12a to 12e is used. The metal plate constituting the jig 10 may be, for example, a steel plate or a copper plate. The material of the jig is not limited to metal and may be a resin material. The number of the notches 12 is also not particularly limited as long as two or more are provided.

[0023] The jig 10 is used to check the thickness of a square steel pipe used in construction work such as a building, and the thickness can be checked by placing the curved surface 14 of the cutout 12 against the R-shaped corner of the square steel pipe (strictly speaking, the outer surface curved in an arc at the corner). To be more specific, as described above, the radius of curvature of the outer surface of the corner of the square steel pipe is specified according to the plate thickness. In other words, each type of square steel pipe is manufactured to have a plate thickness specific to its type and standard size, and a curved surface set to a curvature radius according to the plate thickness. In other words, if the curvature (or radius of curvature) of the outer surface of the corner of the square steel pipe can be checked, the plate thickness can be checked.

[0024] In the jig 10 of this embodiment, the curved surface 14 of the cutout portion 12 is formed to have a curvature that fits the corner portion (more specifically, the outer surface of the corner portion) when it comes into contact with the corner portion of the square steel pipe. Therefore, when the curved surface 14 of the cutout portion 12 fits the corner portion of the square steel pipe, the curvature (radius of curvature) of the curved surface 14 of the cutout portion 12 can be considered as the curvature (radius of curvature) of the outer surface of the corner portion of the square steel pipe. Furthermore, if the curvature of the curved surface 14 is known in advance, the plate thickness of the square steel pipe can also be confirmed based on the curvature (radius of curvature).

[0025] The multiple cutouts 12 each have a curved surface 14 with a different curvature, more specifically, a curved surface 14 with a curvature that fits the corner of the corresponding steel material among multiple types of square steel materials with different plate thicknesses. However, it is not limited to the case where the curvatures of the curved surfaces 14 of the multiple cutouts 12 are all different. It is sufficient that the multiple cutouts 12 include one cutout 12 with a different curvature of the curved surface 14. Specifically, it is sufficient that the multiple cutouts 12 include a first cutout having a curved surface 14 with a curvature that fits the corner of a first square steel pipe, and a second cutout having a curved surface 14 with a curvature that fits the corner of a second square steel pipe with a plate thickness different from that of the first square steel pipe. Here, the first cutout portion refers to one of the multiple cutout portions 12, and the second cutout portion refers to any one of the multiple cutout portions 12 other than the first cutout portion (the remaining cutout portions 12). The first square steel pipe corresponds to the first steel material, corresponds to the first cutout portion, and is a square steel pipe whose plate thickness can be confirmed by the first cutout portion. The second square steel pipe corresponds to the second steel material, corresponds to the second cutout portion, and is a square steel pipe whose plate thickness can be confirmed by the second cutout portion.

[0026] Further, the multiple cutouts 12 are provided at intervals on the outer edge portion of the jig 10. The interval between adjacent cutouts 12 is not particularly limited, but if the cutouts 12 are arranged closely together, the interval between the cutouts 12 becomes small, resulting in protrusions that hinder the checking work, and therefore it is preferable to provide an appropriate number of cutouts 12 at appropriate intervals on the outer edge portion of the jig 10 in the circumferential direction (the direction following the outer edge of the jig 10). The shape of the outer edge portion (non-cutout portion) 16 where no cutout portion is provided is not particularly limited, but for the same reasons as above, it is preferable that the outer edge be formed as a straight line.

[0027] In addition, the positional relationship between the multiple cutouts 12 is not particularly limited, but it is preferable that the cutouts 12 with large curvatures and the cutouts 12 with small curvatures are arranged alternately in the circumferential direction. In other words, in this embodiment, three or more cutouts 12 having curved surfaces 14 with different curvatures are provided, and in the configuration shown in FIG. 1, five cutouts 12a to 12e are provided. In such a configuration, it is preferable to provide each cutout 12 so that the curvature of the curved surface 14 of one cutout is smaller than the curvature of the curved surfaces 14 of the two cutouts 12 adjacent to each other across the one cutout 12, or larger than the curvature of the curved surfaces 14 of the two cutouts 12. With such a configuration, it is possible to check the plate thickness of multiple types of square steel pipes with one jig, improving the versatility of the jig. Furthermore, with the above configuration, the size of the jig 10 can be made smaller than in a configuration in which a plurality of cutout portions 12 are arranged so that cutout portions 12 having similar curvatures are adjacent to each other.

[0028] In the vicinity of each cutout 12 in the jig 10, as shown in FIG. 1, thickness information of a square steel pipe having a corner portion that fits with the curved surface 14 is shown. That is, in the jig 10, the first information on the thickness of the first square steel pipe (corresponding to the first steel material) is shown in the portion corresponding to the first cutout, and the second information on the thickness of the second square steel pipe (corresponding to the second steel material) is shown in the portion corresponding to the second cutout. Here, the portion corresponding to the cutout is the peripheral portion of the cutout, more specifically, the portion adjacent to the curved surface of the cutout. In the configuration shown in FIG. 1, numerical information representing the thickness of the square steel pipe that can be confirmed by each cutout 12 is shown in the portion corresponding to each of the five cutouts 12a to 12e, and in the configuration shown in FIG. 1, "9", "12", "16", "19", and "22" (all in mm) are shown as examples. However, the information regarding the plate thickness of the square steel pipe shown in the portion of the jig 10 corresponding to the cutout portion 12 is not limited to numbers, and may be symbols or designs.

[0029] In this embodiment, the above-mentioned numerical information is formed on the jig 10 by punching with laser irradiation. That is, a first punched portion showing the first information is formed in the portion of the jig 10 corresponding to the first cutout portion, and a second punched portion showing the second information is formed in the portion of the jig 10 corresponding to the second cutout portion. In the configuration shown in FIG. 1, a punched portion 18 showing numerical information showing the plate thickness of the square steel pipe that can be confirmed by each cutout portion 12 is formed in the portion corresponding to each of the five cutout portions 12a to 12e. However, the information on the plate thickness of the square steel pipe shown in the portion of the jig 10 corresponding to the cutout portion 12 may be shown by cutting, uneven processing, surface processing such as etching, etc., without being particularly by punching processing.

[0030] As described above, by using the jig 10 of this embodiment, the plate thickness of a square steel pipe can be easily confirmed. It is possible to propose an L-shaped jig 20 having a single cutout portion 12 as shown in FIG. 2 in order to achieve the same effect. In this case, however, it is necessary to prepare a jig 20 for each plate thickness (curvature) that needs to be confirmed. In addition, the number of jigs 20 required corresponds to the number of types of plate thickness that need to be confirmed, and the more the number of jigs 20 increases, the more difficult it becomes to carry the jigs 20. In addition, with the jig 20 of FIG. 2, only one type of plate thickness of a square steel pipe can be confirmed using one jig 20. In contrast, the jig 10 of this embodiment can check the plate thicknesses of multiple types of square steel pipes using a single jig 10, and therefore has superior advantages over jig 20 in terms of the effort and cost required to manufacture the jig, portability, lightness, ease of handling, and versatility of the jig.

[0031] Next, a method of using the jig 10, that is, a method of checking the plate thickness of a square steel pipe using the jig 10, will be described. At a construction site, a worker first applies the curved surface 14 of one cutout portion (first cutout portion) 12 of the jig 10 to a corner portion of a square steel pipe used as a construction material. At that time, if the curved surface 14 fits with the corner portion of the square steel pipe, the plate thickness of the square steel pipe can be checked by checking the number punched out (punched portion 18) near the curved surface 14. On the other hand, if the curved surface 14 does not fit with the corner portion of the square steel pipe, the worker switches to the curved surface 14 of another cutout portion (second cutout portion) 12 and applies it to the corner portion of the square steel pipe again, and if the cutout portion fits, the plate thickness can be checked.

[0032] Although one embodiment of the plate thickness confirmation jig and plate thickness confirmation method of the present invention has been described above, the above embodiment is merely an example for facilitating understanding of the present invention and does not limit the present invention. In other words, the present invention can be modified and improved without departing from the spirit of the present invention. In addition, the present invention naturally includes its equivalents. [Explanation of symbols]

[0033] 10, 20 Plate thickness checking jig 12, 12a, 12b, 12c, 12d, 12e Cutouts 14 Curved Surfaces 16 Non-notched part 18 Punching section

Claims

1. A plate-shaped jig used to check the plate thickness of a square tube-shaped steel material, A plurality of notches are provided on an outer edge portion of the jig, Each of the plurality of cutout portions has an arched curved surface that is brought into contact with a corner portion of the steel material, the curved surface has a curvature that fits the corner portion of the steel material when the curved surface abuts against the corner portion, The plurality of cutout portions include A first cutout portion having a curved surface having a curvature that fits a corner portion of the first steel material; and a second cutout portion having a curved surface with a curvature that fits with a corner portion of a second steel material having a plate thickness different from that of the first steel material.

2. The jig according to claim 1 , wherein the plurality of cutouts are provided in the outer edge portion with spaces between the cutouts.

3. The jig according to claim 1 , wherein the outer edge portion has non-notched portions between the adjacent notched portions, the non-notched portions having straight outer edge lines.

4. The outer edge portion of the jig is provided with three or more cutout portions having different curvatures of the curved surfaces as the plurality of cutout portions, The jig according to claim 1 , wherein the curved surface of each of the three or more cutout portions has a curvature that fits a corner portion of a corresponding steel material among a plurality of types of steel materials having different plate thicknesses.

5. The jig described in claim 4, wherein the curvature of the curved surface of one of the three or more cutout portions is smaller than either of the curvatures of the curved surfaces of two cutout portions adjacent to the one cutout portion in the outer edge portion and located at positions sandwiching the one cutout portion, or is larger than either of the curvatures of the curved surfaces of the two cutout portions.

6. A portion of the jig corresponding to the first notch portion indicates first information regarding a plate thickness of the first steel material, The jig according to claim 1 , wherein a portion of the jig corresponding to the second cutout portion indicates second information relating to a plate thickness of the second steel material.

7. a first punched-out portion indicating the first information is formed in a portion of the jig corresponding to the first cutout portion; The jig according to claim 6 , wherein a second punched-out portion indicating the second information is formed in a portion of the jig corresponding to the second cutout portion.

8. A method for checking a thickness of the rectangular tube-shaped steel material by using the jig according to any one of claims 1 to 7.

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