Stud having dual diameters and method for installing studs for aerial work using the same

Abstract

The present invention relates to a stud installation method comprising: a steel fixing part provided at the top and configured to have a circular cross-section, with fastening-inducing screw threads formed on the outer surface; a steel fixing stud formed in a shape extending from the lower part of the steel fixing part and configured to have a circular cross-section, with stud screw threads formed on the outer surface; and a fastening part formed in a shape extending from the lower part of the steel fixing stud and connected to a tool; wherein the method comprises: a drilling step of forming a through hole in the lower part of a ceiling structure using a tool; a stud placement step of placing the end of the steel fixing part of the stud in the through hole formed in the drilling step; and a stud fixing step of connecting the fastening part of the stud using a tool, and then rotating the stud to insert the steel fixing part into the through hole.

Description

Technology Field

[0001] The present invention relates to a stud having a double diameter and a method for constructing a stud for high-altitude work using the same.

[0002] More specifically, the invention relates to a stud having a double diameter that can prevent the stud from loosening from the ceiling structure, and a method for constructing a stud for high-altitude work using the same, wherein a steel fixing part of the stud, having a fastening-inducing thread formed thereon, is fastened to a through hole formed in the ceiling structure that is not machined with threads, thereby inducing a fastening phenomenon to improve the fixing force and thereby preventing the stud from loosening from the ceiling structure. Background Technology

[0004] Generally, to install interior finishes, lighting fixtures, HVAC systems, and piping in a building, high-altitude work involving the fixing of separate static load structures to ceiling slabs, such as H-beams, is essential.

[0005] In this type of high-altitude work, a worker ascends to a high place using a ladder or aerial work platform to perform the task. After drilling a hole in the ceiling structure, a threaded bolt is passed through, and nuts that are tightly fitted to the top and bottom of the ceiling structure are tightened to secure the static load structure.

[0006] In order to drill holes in ceiling structures during such high-altitude work, magnetic drill machines or hydraulic punchers are used. However, since these tools are quite heavy and pose a risk, the work must be performed by a two-person team, which necessitates excessive labor expenditure relative to the work. Additionally, there is a problem in that the difficulty of the work increases because the reel cord (electrical cord) to supply power to the tools must be dragged along with the tool.

[0007] In addition, it is difficult to punch holes in the correct location, resulting in a lack of precision, and the number of items that can be processed per day is limited to about 50, which reduces work efficiency. Prior art literature

[0009] Published Utility Model Publication No. 20-2007-0000945 (August 28, 2007) The problem to be solved

[0010] The present invention was devised to solve the above problems. The objective of the present invention is to provide a stud having a double diameter that can prevent the stud from loosening from the ceiling structure, and a method for constructing a stud for high-altitude work using the same, wherein the steel fixing part of the stud, which has a fastening-inducing thread formed thereon, is fastened by inducing a fastening phenomenon and improving the fixing force by fastening the stud to a through hole in the ceiling structure that is not machined with threads, by means of a press fit.

[0011] In addition, another problem to be solved by the present invention is to provide a stud having a double diameter and a method for constructing a stud for high-altitude work using the same, which can improve work efficiency by drilling so that only a portion of the through hole is opened downward without penetrating the ceiling structure when forming a through hole in the ceiling structure, thereby enabling work to be done with a cordless electric drill instead of using a conventional magnetic drill machine or hydraulic puncher.

[0012] In addition, another problem to be solved by the present invention is to provide a stud having a double diameter and a method for constructing a stud for high-altitude work using the same, which can significantly reduce safety accidents during high-altitude work by enabling a strong connection of the stud with only a drilling hole without forming a separate screw thread in the through hole formed in the ceiling structure.

[0013] In addition, another problem to be solved by the present invention is to provide a stud having a double diameter and a method for constructing a stud for high-altitude work using the same, which can minimize the generation of shock and noise by absorbing vibrations transmitted through the stud, the connecting nut, and the threaded stud by connecting the threaded stud to the lower part of the stud fixed to the ceiling structure using a connecting nut and then suspending a static load structure from the threaded stud. means of solving the problem

[0015] To solve the above problems, the present invention aims to solve technical problems by providing a stud construction method for high-altitude work using a double-diameter stud, comprising: a steel fixing part provided at the top and configured to have a circular cross-section with a fastening-inducing screw thread formed on the outer surface; a steel fixing stud formed in a shape extending from the lower part of the steel fixing part and configured to have a circular cross-section with a stud screw thread formed on the outer surface; and a fastening part formed in a shape extending from the lower part of the steel fixing stud and connected to a tool; wherein the method comprises: a drilling step of forming a through hole in the lower part of a ceiling structure using a tool; a stud placement step of placing the end of the steel fixing part of the stud in the through hole formed in the drilling step; and a stud fixing step of connecting the fastening part of the stud using a tool, and then rotating the stud to insert the steel fixing part into the through hole.

[0016] delete Effects of the invention

[0018] The present invention has a significant effect of preventing the stud from loosening from the ceiling structure by inducing a sticking phenomenon and improving the fixing force by joining a steel fixing part of the stud, which has a sticking-inducing thread formed in a through hole that is not machined with threads formed in the ceiling structure, by press-fitting a stud having a double diameter to a ceiling structure during high-altitude work.

[0019] In addition, the present invention has the significant effect of improving work efficiency by enabling the work to be performed with a cordless electric drill instead of a conventional magnetic drill machine or hydraulic puncher, by drilling so that only a portion of the through hole is opened downward without penetrating the ceiling structure when forming a through hole in the ceiling structure.

[0020] In addition, the present invention has the significant effect of significantly reducing the occurrence of safety accidents during high-altitude work by enabling a secure connection of studs through drilling alone, without forming separate screw threads in the through holes formed in the ceiling structure.

[0021] In addition, the present invention has a significant effect of minimizing shock and noise generation by absorbing vibrations transmitted through the stud, connecting nut, and threaded stud by connecting a threaded stud to the lower part of a stud fixed to a ceiling structure using a connecting nut, and then suspending a static load structure from the threaded stud. Brief explanation of the drawing

[0023] FIG. 1 is a perspective view of a stud having a double diameter according to the present invention. FIG. 2 is a side exploded cross-sectional view of a stud having a double diameter according to the present invention. FIG. 3 is a side cross-sectional view of a stud having a double diameter according to the present invention. FIG. 4 is a side cross-sectional view showing a ceiling fixing part in a double-diameter stud according to the present invention. FIG. 5 is a drawing showing a steel fixing part in a double-diameter stud according to the present invention. FIG. 6 is a side cross-sectional view showing an example in which a steel fixing part of a stud is fastened to a through hole in a stud having a double diameter according to the present invention. FIG. 7 is a side cross-sectional view showing an example in which a washer is provided in a double-diameter stud according to the present invention. FIG. 8 is a side cross-sectional view showing an example of a static load structure combined in a double-diameter stud according to the present invention. FIG. 9 is a side exploded cross-sectional view showing an example in which fixing nuts are installed at the top and bottom of a connecting nut in a double-diameter stud according to the present invention. FIG. 10 is a diagram showing the configuration of a method for constructing a stud for high-altitude work using a stud having a double diameter according to the present invention. FIG. 11 is a schematic diagram showing another embodiment of a method for constructing studs for high-altitude work using studs having double diameters according to the present invention. FIG. 12 is a schematic diagram showing another embodiment of a method for constructing a stud for high-altitude work using a stud having a double diameter according to the present invention. Specific details for implementing the invention

[0024] The advantages and features of the embodiments of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0026] In describing the embodiments of the present invention, if it is determined that a detailed description of known functions or configurations could unnecessarily obscure the essence of the invention, such detailed description will be omitted. Furthermore, terms and words used in this specification and claims are defined in consideration of their functions in the embodiments of the present invention and should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe their invention, they must be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0028] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0030] Before proceeding with the following description with reference to the drawings, it should be noted that matters not necessary to reveal the gist of the invention, namely known configurations that a person skilled in the art with ordinary knowledge can obviously add, have not been illustrated or specifically described.

[0032] First, before describing various embodiments of the present invention in detail with reference to the attached drawings, it should be noted that terms such as directions of components described in the following detailed description or illustrated in the drawings (e.g., "front," "back," "left," "right," "up," "down," "up," "down," "transverse," "longitudinal," "front," "rear," "one side," "other side," "inner side," and "outer side") do not merely indicate or imply that they must have a specific direction, and that such description of directions is intended to facilitate the explanation of the components with reference to the attached drawings.

[0034] The present invention relates to a stud having a double diameter and a method for constructing a stud for high-altitude work using the same, wherein a stud (100) having a double diameter is coupled to a ceiling structure (10) by a press fit during high-altitude work, and a steel fixing part (110) of the stud (100) having a screw thread is forcibly press-fitted into a through hole (11) formed in the ceiling structure (10) that is not machined with screw threads by applying rotational force, thereby inducing a sticking phenomenon to improve the fixing force and thereby preventing the stud (100) from loosening from the ceiling structure (10).

[0036] Hereinafter, a stud having a double diameter according to the present invention will be described in detail with reference to the attached drawings.

[0038] FIG. 1 is a perspective view of a stud having a double diameter according to the present invention, FIG. 2 is a side view exploded cross-sectional view of a stud having a double diameter according to the present invention, FIG. 3 is a side view cross-sectional view of a stud having a double diameter according to the present invention, FIG. 4 is a side view cross-sectional view showing a ceiling fixing part in a stud having a double diameter according to the present invention, FIG. 5 is a drawing showing a steel fixing part in a stud having a double diameter according to the present invention, and FIG. 6 is a side view cross-sectional view showing an example in which the steel fixing part of the stud is fastened to a through hole in a stud having a double diameter according to the present invention.

[0040] The double-diameter stud according to the present invention is characterized by not forming screw threads in the through hole (11) formed in the ceiling structure (10), and by applying rotational force to the steel fixing part (110) of the stud (100) having a fastening-inducing screw thread (111) formed therein to force-fit it into the through hole (11), thereby causing the two objects to stick together similarly to welded objects through frictional heat and pressure so as not to loosen.

[0041] First, the ceiling structure (10) refers to a structure of various forms, such as a steel frame or H-beam, located on the ceiling of a building or various structures, so that the installed static load structure (20) is supported.

[0042] In this ceiling structure (10), a through hole (11) is formed at the bottom that is cut upward to ensure a strong connection of the double-diameter studs according to the present invention.

[0043] Here, the through hole (11) is formed by drilling a hole to a certain depth in the lower part of the ceiling structure (10) using a tool such as an electric drill or a puncher, and provides a space in which the steel fixing part (110) of the stud (100) is forcibly fitted.

[0044] It is preferable that the through hole (11) be formed in a cylindrical shape having a circular cross-section and be formed in a shape that is open to the lower part of the ceiling structure (10), and the inner surface where the through hole (11) is formed is characterized by not having a separate screw thread formed therein.

[0045] Meanwhile, the attached drawing illustrates an example in which a through hole (11) is formed to open to the lower part of the ceiling structure (10), but it is obvious that depending on the design conditions, it can be formed to penetrate the ceiling structure (10).

[0046] In order to form such a through hole (11) in a partially open or through shape, a tool such as an electric drill or a puncher is used, and it is preferable that the hardness and material of the bit for forming the through hole (11) be made of HRC (Hardness Rockwell C) 60 to 69 tool steel.

[0047] This has the advantage that, in order to induce a sticking phenomenon, a through hole (11) without screw threads must be formed, and since the bit equipped in the tool is made of tool steel with a hardness of HRC 60~69, it is easy to stably form a through hole (11) to the desired depth.

[0048] Depending on the design conditions, the through hole (11) can be formed with a chamfered portion (11a) having an outer edge larger than the outer edge of the through hole (11), as described with reference to FIG. 4.

[0049] This chamfered portion (11a) can guide the central axis of the stud (100) to be positioned in a location most similar to the central axis of the through hole (11) before applying rotational force to the stud (100) during the process of the stud (100) being forced into the through hole (11), and furthermore, by eliminating the sharpness of the lower corner portion where the through hole (11) is formed, it can prevent safety accidents such as a worker cutting their hand.

[0050] At this time, the chamfered portion (11a) is formed in a chamfered shape or a counter shape, and the depth (h) in which the chamfered portion (11a) is formed can be within about 1.5 times the spacing (P) of the fastening guide screw thread (111) formed in the steel fixing portion (110) of the stud (100).

[0051] For example, if the spacing (P) of the fastening guide screw thread (111) is 1 mm, the depth (h) of the chamfered portion (11a) can be within about 1.5 mm.

[0052] In this configuration, if the depth (h) of the chamfered portion (11a) is formed to be greater than 1.5 mm, the size of the chamfered portion (11a) becomes too large, making it difficult to secure sufficient space to form the through hole (11), and thus there is a problem that the bonding strength between the through hole (11) and the stud (100) is reduced.

[0054] As described with reference to FIGS. 1 to 3, the stud (100) that is coupled to the through hole (11) formed in the ceiling structure (10) is configured to include a steel fixing part (110) which is provided at the top and configured to have a circular cross-section and has a fastening guide screw thread (111) formed on its outer surface, a steel fixing stud (120) which is formed in a shape extending from the lower part of the steel fixing part (110) and configured to have a circular cross-section and has a stud screw thread (121) formed on its outer surface, and a fastening part (130) which is formed in a shape extending from the lower part of the steel fixing stud (120) and is connected to a tool.

[0055] These studs (100) are structured to have a double diameter such that the diameter of the steel fixing stud (120) is larger than the diameter of the steel fixing part (110) which is forced-fitted into the through hole (11), so that the steel fixing part (110) with a smaller diameter induces a sticking phenomenon and is fixed to the through hole (11), and the steel fixing stud (120) with a relatively larger diameter firmly connects the connecting nut (200) and the threaded stud (300) described later, thereby enabling stable support of the static load structure (20).

[0056] Here, the steel fixing part (110) is described in detail with reference to FIG. 5, and a fastening guide screw thread (111) is formed on the outer surface, wherein the angle of the fastening guide screw thread (111) is about 50° to 60°, the angle of winding up (lead angle, β) is about 3° to 8°, and the spacing of the threads (pitch, P) can be 0.5 to 4.5 mm.

[0057] In addition, the upper and lower limits of the steel fixing part (110) and the through hole (11), respectively, for inducing the adhesion phenomenon can be determined by the following formula 1.

[0058] [Formula 1]

[0059]

[0060] (Here, the axial reference diameter refers to the diameter.)

[0061] For example, if the axial reference diameter is 10 mm, the crest angle is 60°, and the crest spacing is 1.0 mm,

[0062] When the upper limit of the shaft diameter of the steel fixing part (110) is 5%, the value 10-(SIN60×1.0×5%)=9.957 can be obtained by substituting it into the above formula 1.

[0063] When the lower limit of the shaft diameter of the steel fixing part (110) is 20%, the value 10-(SIN60×1.0×20%)=9.826 can be obtained by substituting it into the above formula 1.

[0064] In addition, when the upper limit of the through hole (11) is 65%, the upper limit fitting ratio is substituted into the above formula 1 to obtain a value of 10-(SIN60×1.0×65%) = 9.437, and

[0065] When the lower limit of the through hole (11) is 80%, the lower limit fitting ratio is substituted into the above formula 1 to obtain a value of 10 - (SIN60 × 1.0 × 80%) = 9.307.

[0066] That is, the processing range of the steel fixing part (110) is preferably 9.826 mm to 9.957 mm, and the processing range of the through hole (11) is preferably 9.307 mm to 9.437 mm.

[0067] This limits the processing range to induce a sticking phenomenon during the process in which a steel fixing part (110) with a sticking-inducing screw thread (111) formed in a through hole (11) that is not threaded is inserted. If the processing range of the through hole (11) is smaller than 9.826 mm or larger than 9.957 mm, or if the processing range of the through hole (11) is smaller than 9.307 mm or larger than 9.437 mm, a problem may arise in which the correct sticking phenomenon does not occur.

[0068] In addition, it is preferable that the steel fixing part (110) of the stud (100) be made about 200 to 400% higher than the material strength of the through hole (11) formed in the ceiling structure (10).

[0069] This means that during the process of inserting a steel fixing part (110) having a fastening-inducing screw thread (111) formed into a through hole (11) where no screw thread is formed, it must be inserted while creating a path in the shape of a screw thread (tap shape) to induce a fastening phenomenon. At this time, since the material strength of the steel fixing part (110) is higher than that of the through hole, the fastening-inducing screw thread (111) formed in the steel fixing part (110) is not damaged and is inserted while stably creating a path, thereby smoothly inducing the occurrence of a fastening phenomenon.

[0070] Additionally, the stud (100) can be configured to have a hardness of about 100 to 200% of the core hardness up to a depth of 1 mm or less relative to the outer surface.

[0071] This allows the surface strength of the stud (100) to be equal to or higher than the depth strength, thereby preventing the squeezing-inducing screw thread (111) or the stud screw thread (121) from being crushed during fastening by screw thread connection.

[0072] In addition, the stud (100) may have a friction coefficient of 0.09 to 0.20 to induce smooth fastening and seizure when threaded.

[0074] The fastening portion (130) provided on the stud (100) is formed in a shape extending from the lower part of the steel fixing stud (120), and is formed to have a triangular, square, pentagonal, or hexagonal cross-section.

[0075] Additionally, the end of the fastening part (130) may have a fastening groove (131) formed in a shape that is recessed inward, and the fastening groove (131) may also be formed to have a triangular, square, pentagonal, or hexagonal cross-section.

[0076] For example, referring to FIG. 1, the end of the fastening part (130) having a hexagonal cross section may be formed in a shape in which a hexagonal cross section fastening groove (131) is carved inward.

[0077] This allows the fastening part (130) and the fastening groove (131) to be formed in a hexagonal cross-sectional shape during the process of fastening the stud (100) to the through hole (11), thereby facilitating the use of the tool and enabling the transmission of a strong rotational force to induce a proper adhesion phenomenon.

[0078] Depending on the design conditions, one or more selected from the fastening part (130) and the fastening groove (131) may be formed to have an irregular cross section such as a star shape, a cross shape, a crescent shape, an arc shape, a fan shape, etc.

[0079] Additionally, the fastening part (130) can be configured so that when a specified torque value is reached during the process of fastening the stud (100) to the through hole (11) of the ceiling structure (10), the bolt neck portion of the fastening part (130) is automatically sheared (cut) from the steel fixing stud (120). Accordingly, when the stud (100) is tightened with a constant torque, the fastening part (130) is cut and the fastening is completed, which can be immediately seen from the outside, thereby ensuring uniform fastening quality even for non-skilled workers.

[0081] Meanwhile, in the process of fastening the stud (100) to the through hole (11), the fastening can be configured to be performed using a tool having a certain amount of rotational force (torque and rotational speed (RPM)).

[0082] That is, in order to force-fit the stud (100) into the through hole (11) without applying heat or cooling to the stud (100) and to ensure that the force-fit is achieved at room temperature, it is essential to use a tool capable of applying a strong rotational force.

[0083] In this way, the rotational force of a tool for transmitting strong rotational force can be determined by the following Equation 2.

[0084] [Equation 2]

[0085]

[0086] (Here, the median friction coefficient is the median friction coefficient of the stud (100) calculated as ((0.09+0.20) / 2), the yield strength of the shaft is the tensile strength × yield ratio, and the cross-sectional area of ​​the lower shaft diameter limit of the steel fixing part is the thinnest part (lower limit value) of the steel fixing part (110), and refers to the area of ​​a circle based on 9.82, which is the lower shaft diameter limit value of the steel fixing part (110) calculated in the above (Equation 1).)

[0087] (To elaborate, 80% of the yield strength of the shaft means the range in which it does not stretch or break during the process of fastening the stud (100).)

[0088] For example, when the axial reference diameter is 10 mm, the median value of the friction coefficient of the stud (100) is 0.145, the tensile strength is 1040 MPa, and the yield ratio is 90%,

[0089] The minimum torque value of the tool for fastening the stud (100) to the through hole (11) can be obtained by substituting it into the above formula 2, resulting in a value of 10×0.145×1040×90%×80%×(9.82^2×∏÷4)=82.233N-mm(=82.2Nm).

[0090] In this way, by using a tool that satisfies the minimum torque value of the tool to fasten the stud (100) into the through hole (11), not only is the stud (100) smoothly inserted, but problems such as the stud (100) stretching or breaking and being damaged are prevented, and sufficient rotational force and pressure are applied to the ceiling structure (10) to induce a proper adhesion phenomenon.

[0092] Meanwhile, the galling phenomenon described above refers to a phenomenon in which metal surfaces melt and stick together or are torn off due to frictional heat and pressure between the threads during the process of fastening bolts and nuts, resulting in the formation of irregular crystals.

[0093] To elaborate, not only are irregularly shaped crystals formed, but the bolts and nuts that have undergone the phenomenon of adhesion also bond together due to heat, resulting in a very strong bond that is difficult to loosen, and various problems such as the bolt breaking if one tries to loosen it by force occur.

[0094] Accordingly, the double-diameter stud according to the present invention is fastened by applying sufficient rotational force to the steel fixing part (110) of the stud (100), which has a fastening-inducing screw thread (111) formed in a through hole (11) where no screw thread is formed, so that as shown in FIG. 6, the fastening-inducing screw thread (111) enters the inner surface where the through hole (11) is formed, creating a path, and due to the frictional heat and pressure generated at this time, a fastening phenomenon occurs, and by interlocking and firmly joining, the stud (100) is prevented from loosening.

[0095] Accordingly, a loosening-resistant effect similar to welding can be obtained using a non-welding method, thereby enabling a robust joint structure.

[0097] FIG. 7 is a side cross-sectional view showing an example in which a washer is provided in a double-diameter stud according to the present invention.

[0099] Depending on the design conditions, a washer (140) may be provided that penetrates the steel fixing part (110) of the stud (100) and adheres to the steel fixing stud (120) and the ceiling structure (10) during the process in which the stud (100) is fastened to the through hole (11) formed in the ceiling structure (10).

[0100] These washers (140) can prevent problems such as deformation or sinking by dispersing the pressure applied to the steel fixing stud (120) of the stud (100) and the ceiling structure (10) during the process in which the stud (100) is fastened to the through hole (11) with strong rotational force, and can improve the effect of preventing the stud (100) from loosening due to friction.

[0102] FIG. 8 is a side cross-sectional view showing an example of a static load structure combined in a double-diameter stud according to the present invention.

[0104] As described above through FIGS. 1 to 7, when a stud (100) is firmly bonded to a ceiling structure (10) by a bonding phenomenon, a connecting nut (200) and a threaded stud (300) for installing a static load structure (20) can be configured to be connected to the lower part of the stud (100).

[0106] The connecting nut (200) is joined to the lower part of the stud (100) by a threaded connection.

[0107] As described with reference to FIG. 8, this connecting nut (200) has an inner coupling part (210) formed with an opening on one side and the other side, and a screw thread is formed on the inner surface where the inner coupling part (210) is formed.

[0108] Accordingly, when the connecting nut (200) is connected to the stud (100), it is fastened by the threaded connection with the stud thread (121) formed on the outer surface of the steel fixing stud (120) of the stud (100).

[0110] The computer stud (300) is connected to the lower part of the connecting nut (200) by a threaded connection and performs the function of enabling the installation of a static load structure (20).

[0111] These threaded studs (300) may be formed in the shape of threaded bolts with threads formed on their outer surface, and are fastened by the threaded connection between the threads formed on the outer surface and the threads formed on the inner coupling portion (210) of the connecting nut (200).

[0113] At this time, the fixation of the static load structure (20) penetrating the computer stud (300) can be configured to be secured by a fixing nut (400) that is threaded and fastened to the computer stud (300).

[0114] Referring to FIG. 8, a pair of fixing nuts (400) are fastened to the threaded stud (300) by threading, and are respectively provided at the top and bottom of the static load structure (20) to be in close contact, thereby enabling the static load structure (20) to be safely and firmly supported from the threaded stud (300).

[0115] Here, the fixing nut (400) may be formed in the shape of a loosening nut, and a thread for threaded connection may be formed on the inner surface of the penetrating space.

[0116] In addition, the outer surface may be configured to have a hexagonal cross-section so that rotational force can be applied by a tool such as a wrench.

[0118] FIG. 9 is a side exploded cross-sectional view showing an example in which fixing nuts are installed at the top and bottom of a connecting nut in a double-diameter stud according to the present invention.

[0120] Depending on the design conditions, a fixing nut (400) that is in close contact with one or more selected of the upper and lower parts of the connecting nut (200) may be provided.

[0121] That is, the fixing nut (400) can be configured to be threaded to the steel fixing stud (120) so as to be in close contact with the top of the connecting nut (200), or threaded to the threaded stud (300) so as to be in close contact with the bottom of the connecting nut (200).

[0122] As another example, as shown in FIG. 9, a pair of fixing nuts (400) may be provided at the top and bottom of each of the connecting nuts (200).

[0123] This is explained in detail with reference to FIGS. 8 and 9. After the fixing nut (400) is fastened to the stud thread (121) formed on the outer surface of the steel fixing stud (120) of the stud (100), it is made to be in close contact with the upper part of the connecting nut (200) connected to the lower part of the stud (100), thereby preventing the connecting nut (200) from loosening from the stud (100).

[0124] In addition, the fixing nut (400), which is fastened by threading the threaded stud (300) fastened to the lower part of the connecting nut (200), is made to be in close contact with the lower part of the connecting nut (200), thereby preventing the threaded stud (300) from loosening from the connecting nut (200).

[0125] That is, a pair of fixing nuts (400) are configured to be in close contact with the upper and lower parts of the connecting nut (200), respectively, so as to prevent loosening between the components.

[0127] According to this configuration, the double-diameter stud according to the present invention is coupled to a ceiling structure (10) by a press fit during high-altitude work, and the steel fixing part (110) of the stud (100), which has a fastening-inducing screw thread (111) formed therein, is coupled by a press fit to a through hole (11) (11) formed in the ceiling structure (10) where the screw thread is not machined, thereby inducing a fastening phenomenon to improve the fixing force and thereby preventing the stud (100) from loosening from the ceiling structure (10).

[0128] In addition, the present invention allows for improved work efficiency by forming a through hole (11) in a ceiling structure (10) by drilling only a portion of the through hole (11) that is open to the lower part without penetrating the ceiling structure (10), thereby enabling the work to be performed with a cordless electric drill instead of using a conventional magnetic drill machine or hydraulic puncher.

[0129] In addition, the present invention allows for a secure connection of the stud (100) through the hole (11) formed in the ceiling structure (10) without forming a separate screw thread, thereby significantly reducing the occurrence of safety accidents during high-altitude work.

[0130] In addition, the present invention allows for minimizing shock and noise generation by absorbing vibrations transmitted through the stud (100), the connecting nut (200), and the threaded stud (300) by connecting a threaded stud (300) to the lower part of a stud (100) fixed to a ceiling structure (10) using a connecting nut (200), and then suspending and installing a static load structure (20) on the threaded stud (300).

[0132] Hereinafter, a method for constructing studs during high-altitude work using a double-diameter stud according to the present invention will be described.

[0133] First, it should be noted that parts that overlap with the content already described in Figures 1 through 9 have not been described.

[0135] FIG. 10 is a diagram showing the configuration of a method for constructing a stud for high-altitude work using a stud having a double diameter according to the present invention.

[0137] The method for constructing a stud for high-altitude work using a double-diameter stud according to the present invention comprises a drilling step (S10), a stud placement step (S20), and a stud fixing step (S30).

[0139] The drilling step (S10) is a step of forming a through hole (11) in the lower part of the ceiling structure (10) using a tool such as an electric drill or a puncher.

[0140] At this time, the through hole (11) can be formed by considering the material or specifications (thickness) of the ceiling structure (10), and can be formed by penetrating the ceiling structure (10) or by drilling to a depth of about 60 to 80% of the thickness of the ceiling structure.

[0141] For example, when forming a through hole (11) in a steel ceiling structure (10) having a thickness of 10 mm, it can be configured to form a through hole (11) with a depth of about 7 mm.

[0142] Meanwhile, in the process of forming the through hole (11), if it is formed by cutting or punching, oil or lubricant such as cutting fluid and punching fluid resulting from the use of a tool may be used.

[0143] At this time, in order to force-fit the stud (100) into the through hole (11), it is difficult to generate sufficient frictional heat and pressure due to the oil or lubricant, etc., so the rate of seizure is reduced. Therefore, the oil or lubricant used before joining the stud (100) into the through hole (11) must be removed before joining the stud (100) into the through hole (11).

[0144] Depending on the design conditions, the drilling step (S10) can be configured to form a chamfered portion (11a) having an outer edge larger than the outer edge of the through hole (11) by drilling at the bottom of the ceiling structure (10) using a bit with a larger diameter than the bit for forming the through hole (11).

[0146] The stud placement step (S20) is a step of placing the end of the steel fixing part (110) of the stud (100) into the through hole (11) formed in the drilling step (S10).

[0147] That is, the stud placement step (S20) is a preparation step for fastening the steel fixing part (110) of the stud (100) adjacent to the through hole (11).

[0148] At this time, by allowing a part of the end of the steel fixing part (110) of the stud (100) to be drawn into the through hole (11) through the chamfered part (11a) formed in the drilling step (S10), the stud (100) can be positioned at an accurate location.

[0150] The stud fixing step (S30) is a step of fixing the stud (100) by connecting a tool to the fastening part (130) of the stud (100) and then applying a strong rotational force to rotate the stud (100), thereby causing the fastening guide screw thread (111) formed on the steel fixing part (110) of the stud (100) to penetrate the inner surface of the through hole (11) and force-fit the stud (100).

[0151] That is, the stud (100) is strongly rotated and inserted into the through hole (11) to be fixed.

[0152] Depending on the design conditions, the stud fixing step (S30) may be configured such that, in the process of fastening the stud (100) to the through hole (11) formed in the ceiling structure (10), a washer (140) is passed through the steel fixing part (110) of the stud (100) and then fastened.

[0153] Accordingly, the washer (140) is in close contact between the steel fixing stud (120) and the ceiling structure (10), thereby dispersing the pressure applied to the steel fixing stud (120) and the ceiling structure (10), preventing deformation or sinking, and improving the anti-loosening effect of the stud (100) by friction.

[0155] Through this process, the method for constructing a stud for high-altitude work using a double-diameter stud according to the present invention can induce a bonding phenomenon to firmly bond the stud (100) to the through hole (11) formed in the ceiling structure (10).

[0157] FIG. 11 is a schematic diagram showing another embodiment of a method for constructing studs for high-altitude work using studs having double diameters according to the present invention.

[0159] Depending on the design conditions, when the connection of the stud (100) to the ceiling structure is completed in the stud fixing step (S30), the process may be configured to include a nut connection step (S40), a threaded stud connection step (S50), and a fixing nut fastening step (S60) for connecting a connecting nut (200) and a threaded stud (300) for installing a static load structure (20) in an extended form to the lower part of the stud (100).

[0161] The nut connection step (S40) is a step of connecting an inner coupling part (210) formed on one side of a connecting nut (200) to the lower part of a steel fixing stud (120) of a stud (100) fixed to a ceiling structure (10) by threading it.

[0162] At this time, the connecting nut (200) is formed in a shape in which an inner coupling portion (210) is carved into each of the one side and the other side, and screw threads are formed on the inner surface where the inner coupling portion (210) is formed.

[0164] The threaded stud connection step (S50) is a step of connecting the threaded stud (300) by threading it to the inner coupling part (210) formed on the other side of the connection nut (200).

[0166] The fixing nut fastening step (S60) is threaded into the threaded stud (300) so that the fixing nut (400) is in close contact with the upper and lower ends of the static load structure (20) that penetrates the threaded stud (300), thereby stably supporting the static load structure (20) that penetrates the threaded stud (300).

[0168] According to this configuration, a connecting nut (200) and a threaded stud (300) are connected in an extended form to the lower part of a stud (100) that is firmly fixed to a ceiling structure (10) by a bonding phenomenon, and a static load structure (20) is installed by suspending it from the threaded stud (300), thereby absorbing vibrations transmitted through the stud (100), the connecting nut (200), and the threaded stud (300), thereby minimizing the generation of shock and noise and stably supporting the static load structure (20).

[0170] FIG. 12 is a schematic diagram showing another embodiment of a method for constructing a stud for high-altitude work using a stud having a double diameter according to the present invention.

[0172] As illustrated in FIG. 12, the nut connection step (S40) may be configured to include an upper fixing nut contact step (S41) and a lower fixing nut contact step (S42) for contacting a fixing nut (400) to one or more selected of the upper and lower parts of the connecting nut (200) in order to improve the bonding strength between the stud (100) and the connecting nut (200) connected to the lower part of the stud (100).

[0174] The upper fixing nut contact step (S41) is a step in which a fixing nut (400) is fastened to a stud (100) fixed to a ceiling structure (10), and then a connecting nut (200) is fastened so that the fixing nut (400) is in close contact with the upper part of the connecting nut (200).

[0175] To explain this in detail with reference to FIG. 9, first, a fixing nut (400) is fastened to the stud thread (121) formed on the outer surface of the steel fixing stud (120) of the stud (100) in a tightening direction (clockwise), and then the steel fixing stud (120) is fastened to the inner coupling part (210) formed on one side of the connecting nut (200).

[0176] Afterward, when the steel fixing stud (120) is fastened so that it is sufficiently inserted into the inner coupling part (210) formed on one side of the connecting nut (200), if the fixing nut (400) fastened to the stud thread (121) is rotated in a loosening direction (counterclockwise), the fixing nut (400) is pressed against the top of the connecting nut (200) to prevent the connecting nut (200) from loosening from the stud (100).

[0178] The lower fixing nut contact step (S42) is a step of securing the fixing nut (400) to the threaded stud (300) connected to the lower part of the connecting nut (200) to bring it into close contact with the lower part of the connecting nut (200).

[0179] Preferably, when the threaded stud (300) is fixed to the lower part of the connecting nut (200), the fixing nut (400) is first fastened to the threaded stud (300) before the static load structure (20) is passed through the threaded stud (300), and then the threaded stud (300) is pressed against the lower part of the connecting nut (200) so that the threaded stud (300) is prevented from loosening from the connecting nut (200).

[0180] In this way, the upper fixing nut contact step (S41) and the lower fixing nut contact step (S42) ensure that the fixing nuts are contacted symmetrically to each other on the upper and lower parts of the connecting nut (200), respectively, thereby improving the bonding strength between the stud (100), the connecting nut (200), and the threaded stud (300) and preventing loosening.

[0182] According to this configuration, the method for constructing a stud for high-altitude work using a double-diameter stud according to the present invention is a method for stably fixing a static load structure (20) to a ceiling structure (10), and by inducing a bonding phenomenon through a room temperature press-fit connection, it is possible to provide a strong fixing force and prevent loosening.

[0183] To elaborate, the steel fixing part (110) of the stud (100), which has a fastening-inducing screw thread (111) formed thereon, is rotated to force-fit the through hole (11) of the ceiling structure (10) that does not have a screw thread formed thereon. In this process, a fastening phenomenon is induced, causing the stud (100) to stick to the through hole (11) in a manner similar to being welded due to frictional heat and pressure, thereby preventing the stud (100) fixed to the ceiling structure (10) from loosening.

[0185] Although various embodiments of the present invention have been presented and described in the above description, the present invention is not necessarily limited thereto, and those skilled in the art will understand that various substitutions, modifications, and changes are possible within the scope of the technical concept of the present invention. Explanation of the symbols

[0187] 10: Ceiling structure 11 : Communion 11a : Chamfered part 20 : Static load structures 100 : stud 110 : Steel fixing part 111 : Seizure-inducing thread 120 : Steel fixing stud 121 : Stud thread 130 : Fastening part 131 : Connection Home 140 : Washer 200 : Connecting nut 210 : Inner connecting part 300 : Computer Stud 400 : Fixing nut

Claims

Claim 1 A method for constructing a stud (100) comprising: a steel fixing part (110) provided at the top and configured to have a circular cross-section, with a latching-inducing screw thread (111) formed on the outer surface; a steel fixing stud (120) formed in a shape extending from the lower part of the steel fixing part (110) and configured to have a circular cross-section, with a stud screw thread (121) formed on the outer surface; and a fastening part (130) formed in a shape extending from the lower part of the steel fixing stud (120) and connected to a tool; wherein the method comprises: a drilling step (S10) of forming a through hole (11) using a tool in the lower part of a ceiling structure (10); and a stud placement step (S20) of placing the end of the steel fixing part (110) of the stud (100) in the through hole (11) formed in the drilling step (S10). A method for constructing a stud for high-altitude work using a double-diameter stud, characterized by comprising: a stud fixing step (S30) in which, after connecting the fastening part (130) of the stud (100) using a tool, the stud (100) is rotated to insert the steel fixing part (110) into the through hole (11). Claim 2 A method for constructing a stud for high-altitude work using a double-diameter stud according to claim 1, comprising: a connecting nut (200) coupled to the lower part of the stud (100) by a threaded connection; and a threaded stud (300) coupled to the lower part of the connecting nut (200) by a threaded connection, wherein a static load structure (20) is installed on the threaded stud (300). Claim 3 A method for constructing a stud for high-altitude work using a double-diameter stud according to claim 2, comprising: a fixing nut (400) which is thread-coupled to the steel fixing stud (120) and is in close contact with the upper end of the connecting nut (200), or thread-coupled to the threaded stud (300) and is in close contact with the lower end of the connecting nut (200), or is in close contact with both the upper end and the lower end of the connecting nut (200). Claim 4 A method for constructing a stud for high-altitude work using a double-diameter stud, characterized in that, in claim 2, it comprises a fixing nut (400) that is thread-coupled to the computer stud (300) and adheres to the upper and lower ends of a static load structure (20). Claim 5 A method for constructing a stud for high-altitude work using a double-diameter stud according to claim 1, wherein the through hole (11) is formed in a shape that is open to the lower part of the ceiling structure (10) and is formed to have a circular cross-section, and a chamfered portion (11a) having an outer circumference larger than the outer circumference of the through hole (11) is formed at the bottom of the ceiling structure (10). Claim 6 A method for constructing a stud for high-altitude work using a double-diameter stud according to claim 1, wherein the fastening portion (130) is formed to have a triangular, square, pentagonal, or hexagonal cross section, or is formed to have a star-shaped, cross-shaped, crescent-shaped, arc-shaped, or fan-shaped cross section. Claim 7 A method for constructing a stud for high-altitude work using a double-diameter stud according to claim 6, wherein the fastening portion (130) comprises a fastening groove (131) formed in a shape that is recessed inward, and the fastening groove (131) is formed to have a triangular, square, pentagonal, or hexagonal cross section, or is formed to have a star-shaped, cross-shaped, crescent-shaped, arc-shaped, or fan-shaped cross section. Claim 8 delete Claim 9 A method for constructing a stud for high-altitude work using a double-diameter stud according to claim 1, comprising: a nut connection step (S40) for connecting an inner coupling part (210) formed on one side of a connecting nut (200) to the lower part of a steel fixing stud (120) of a stud (100) fixed to a ceiling structure (10) by threading; a threaded stud connection step (S50) for connecting a threaded stud (300) to an inner coupling part (210) formed on the other side of the connecting nut (200) by threading; and a fixing nut fastening step (S60) for connecting a fixing nut (400) to a threaded stud (300) so that the fixing nut (400) is in close contact with the upper and lower parts of a static load structure (20) that penetrates the threaded stud (300). Claim 10 A method for constructing a stud for high-altitude work using a double-diameter stud according to claim 9, wherein the nut connection step (S40) comprises an upper fixing nut contact step (S41) in which a fixing nut (400) is fastened to a stud (100) fixed to a ceiling structure (10) and a connecting nut (200) is fastened; and the threaded stud connection step (S50) comprises a lower fixing nut contact step (S42) in which a fixing nut (400) is fastened to a threaded stud (300) connected to the lower part of the connecting nut (200) and is fastened to the lower part of the connecting nut (200).

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