Fixing members, fasteners, and fixing structures for the underlying steel frame

Abstract

The underlying steel frame is fixed to the steel frame members without welding the underlying steel frame to the steel frame members. [Solution] The fixing member 102 holds the base steel frame 30, whose end portion 32 is resting on the lower flange 26 of the steel beam 100, and fixes it to the lower flange 26 by tightening a screw bolt 160 that is screwed into a screw hole 147 formed in the lower overhang plate portion 146 facing the lower surface 26A of the lower flange 26.

Description

Technical Field

[0004] , , , ,

[0001] The present invention relates to a fixing structure for a fixing member, a fixture, and a base steel frame.

Background Art

[0002] Patent Document 1 discloses a technique related to a board mounting fitting for a steel frame beam that is fixed to a steel frame beam for attaching boards such as a decorative board, a sub-floor board, a plaster board, and a fireproof board to the steel frame beam. In this prior art, a pair of female screw members are inserted between both flanges of an H-shaped steel, and the board mounting fitting for the steel frame beam is arranged such that the short member extends along one flange of the H-shaped steel and the long member straddles both flanges. Next, bolts screwed into the respective female screw members are screwed in until the tips of the bolts abut against the respective flanges. In this way, the board mounting fitting for the steel frame beam can be easily attached to the H-shaped steel simply by screwing in the bolts.

[0003] Patent Document 2 discloses a technique related to a base material fixing fitting for fixing an inner wall base material constituting an inner wall to a beam material formed of a shaped steel, and a fixing construction method for the inner wall base material using the base material fixing fitting. In this prior art, the base material fixing fitting is a fitting for fixing an inner wall base material constituting an inner wall to a beam material formed of a shaped steel. The base material fixing fitting includes a fitting portion formed by forming cut grooves for fitting into the beam material respectively on both side ends of a first plate piece formed to be narrower toward the upper end, a pair of second plate pieces protruding in the same direction substantially perpendicular to the first plate piece, a support portion for fitting and supporting the inner wall base material in a direction orthogonal to the cut grooves, an adjustment bolt for connecting the first plate piece and the support portion and adjusting the out-of-plane movement of the inner wall base material fitted into the support portion, and the cut grooves are formed on the upper end side of the second plate pieces.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0005] During renovation work, the underlying steel frame for installing suspended ceilings, partition walls, etc., is sometimes fixed to existing steel frame members. In this case, to prevent the underlying steel frame from shifting and falling off due to vibrations during an earthquake, the underlying steel frame may be welded to the existing steel frame members for a secure fixation.

[0006] However, welding work involves the use of fire and requires surrounding area protection, which creates many constraints on the work during renovation projects.

[0007] In view of the above facts, the present invention aims to fix the underlying steel frame to the steel frame member without welding the underlying steel frame to the steel frame member. [Means for solving the problem]

[0008] The first embodiment is a fixing member that holds a base steel frame whose end rests on the flange of a steel frame member, and fastens the end to the flange by tightening a bolt that is screwed into a threaded hole formed in the bottom plate portion facing the lower surface of the flange.

[0009] In the first embodiment of the fastening member, the end of the base steel frame is fixed to the flange by screwing in a bolt, so the base steel frame can be fixed to the steel frame member without welding the base steel frame to the steel frame member.

[0010] The second embodiment is a fixing device for the base steel frame as described in the first embodiment, wherein a nut with a disc spring attached to the tip of the bolt is attached with the disc spring portion facing upward so as to contact the lower surface of the flange.

[0011] In the second embodiment of the fixing device for the base steel frame, when the bolt is screwed in, the disc spring portion of the disc spring nut comes into contact with the lower flange and is fixed in place. Therefore, the frictional force is increased by the spring force of the disc spring portion, making it less likely to shift during an earthquake and improving the performance of preventing detachment.

[0012] The third embodiment is a fastener comprising a pair of fixing members according to claim 1 or 2, which are positioned on both sides of the web of a steel frame member and which hold a pair of base steel frames whose ends rest on the flange and fix them to the flange, and a connecting bolt that connects the pair of fixing members to each other.

[0013] In the third embodiment of the fastening device, the fastening members are connected by connecting bolts, which suppresses displacement due to vibrations during earthquakes and improves the ability to prevent detachment.

[0014] The fourth embodiment is a fixing structure comprising a steel frame member, a pair of base steel frames positioned on both sides of the web of the steel frame member and having their ends resting on the flange of the steel frame member, and a fixing device of the third embodiment in which a pair of fixing members each hold the pair of base steel frames and fix the ends to the lower flange.

[0015] In the fourth embodiment of the fixing structure for the base steel frame, bolts are screwed in to fix the ends of the base steel frame to the flange. Since the fixing members are connected by connecting bolts, displacement due to vibrations during an earthquake is suppressed, and detachment is prevented or suppressed. [Effects of the Invention]

[0016] According to the present invention, the underlying steel frame can be fixed to the steel frame member without welding the underlying steel frame to the steel frame member. [Brief explanation of the drawing]

[0017] [Figure 1] This is a perspective view of one embodiment of the fixed structure, looking up from below. [Figure 2] This is a view of one embodiment of the fixed structure as seen from Y. [Figure 3] This is a view of one embodiment of the fixed structure as seen from X. [Figure 4] This is a view from Y of the overall configuration of the fixed structure in one embodiment. [Figure 5] This is a perspective view of a nut with a disc spring.

BEST MODE FOR CARRYING OUT THE INVENTION

[0018] <Embodiment> A fixing structure of a base steel frame fixed to a steel frame member using the fixture of the present embodiment will be described. Here, two orthogonal horizontal directions are defined as the X direction and the Y direction, which are indicated by arrow X and arrow Y respectively. The vertical direction orthogonal to the X direction and the Y direction is defined as the Z direction, which is indicated by arrow Z.

[0019] [Structure] First, the structure of the fixture and the fixing structure in which the base steel frame is fixed to an existing steel frame member using this fixture will be described.

[0020] As shown in FIGS. 1 to 3, the fixing structure 10 of the present embodiment includes an existing steel beam

[0021]

[0022] The steel beam 20 of the present embodiment is composed of an H-shaped steel having an H-shaped cross section with an upper flange 22, a lower flange 26, and a web 24. Further, the base steel frame 30 of the present embodiment is composed of a channel steel (C-shaped steel), but is not limited thereto (see FIGS. 1 and 2).

[0023] As shown in Figures 1 and 2, the fastener 100 is composed of a pair of fastening members 102 and a connecting bolt 170 (see Figures 1 and 2). The pair of fastening members 102 are positioned on both sides of the web 24 of the steel beam 20, which is made of H-shaped steel. A disc spring nut 200 is attached to the tip of the screw bolt 160, which will be described later, that makes up the fastening member 102. The connecting bolt 170 connects the pair of fastening members 102 on the underside of the steel beam 20.

[0024] As shown in Figures 1 to 3, the fixing member 102 holds the end portion 32 of the base steel frame 30 which is resting on the lower flange 26 of the steel beam 20, and has the function of fixing the end portion 32 to the lower flange 26 by tightening a screw bolt 160, which is screwed into a screw hole 147 (see Figures 2 and 3) formed in the lower overhanging plate portion 146, which is an example of a bottom plate portion described later, and to which a disc spring nut 200 is attached at the tip.

[0025] From another perspective, the fixing member 102 includes a clamping mechanism that secures the end portion 32 of the base steel frame 30, which is resting on the lower flange 26 of the steel beam 20, to the lower flange 26.

[0026] Furthermore, the fixing member 102 may have any configuration as long as it has the function of fixing the end 32 of the base steel frame 30, which is placed on the lower flange 26 of the steel beam 20, to the lower flange 26. Therefore, the configuration of the fixing member 102 described below is just one example and is not limited thereto.

[0027] The fixing member 102 in this embodiment is composed of a holding portion 110 and a connecting portion 150, both of which are made of sheet metal. In this embodiment, the holding portion 110 is described as being made of a single sheet of sheet metal, but it is not limited to this, and may be made by overlapping and joining multiple sheets of sheet metal.

[0028] As shown in Figures 1 and 3, the holding portion 110 is roughly rectangular in shape when viewed from the X direction. Also, as shown in Figures 1 and 2, when viewed from the Y direction, the holding portion 110 is a horizontal U shape having a main body portion 120 that runs vertically, an upper projection portion 130 that extends in the Y direction from the upper end of the main body portion 120, and a lower projection portion 140 that extends in the Y direction from the lower end.

[0029] As shown in Figure 2, the main body 120 is positioned on the outer side in the X direction (away from the web 24) of the lower flange 26 of the steel beam 20. Also, as shown in Figure 3, the main body 120 is composed of a side plate portion 122 facing each other in the Y direction, and an upper plate portion 124 and a lower plate portion 126 facing each other vertically (see also Figures 1 and 2).

[0030] As shown in Figures 1 and 2, the upper overhang 130 is positioned below the upper flange 22, and the upper end of the side plate portion 122 and the upper plate portion 124 of the main body portion 120 extend inward in the X direction (towards the web 24). Similarly, the lower overhang 140 is positioned below the lower flange 26, and the lower end of the side plate portion 122 and the lower plate portion 126 of the main body portion 120 extend inward in the X direction (towards the web 24).

[0031] Furthermore, the portion of the upper overhang 130 extending from the upper end of the side plate portion 122 is designated as the upper overhang side plate portion 132, and the portion extending from the upper plate portion 124 is designated as the upper overhang upper plate portion 134. Similarly, the portion of the lower overhang 140 extending from the lower end of the side plate portion 122 is designated as the lower overhang side plate portion 142, and the portion extending from the lower plate portion 126 is designated as the lower overhang lower plate portion 146.

[0032] The lower plate portion 146 of the lower protruding portion 140 of the holding portion 110, as an example of the bottom plate portion, faces the lower surface 26A of the lower flange 26, and has a screw hole 147 (see Figures 2 and 3) in its center into which a screw bolt 160 is screwed. In addition, a screw hole 123 (see Figure 3) is formed in the upper part of one side plate portion 122 of the main body portion 120 of the holding portion 110 in this embodiment, through which a tapping screw 169 is inserted.

[0033] As shown in Figures 1 to 3, the connecting portion 150 has a connecting plate portion 154 along the Y direction and a bent portion 152 formed by bending both sides of the connecting plate portion 154 in the Y direction inward in the X direction, and has a roughly U-shape when viewed from above or below. The connecting portion 150 is joined to the outside of the lower part of the main body portion 120 of the holding portion 110.

[0034] The connecting plate portion 154 of the connecting portion 150 has a bolt hole 155 (see Figure 2) through which the connecting bolt 170 is inserted. In order to prevent the connecting bolt 170, which passes through the bolt hole 155, from interfering with the screw bolt 160 that is screwed into the screw hole 147 of the lower protruding plate portion 146 mentioned above, the bolt hole 155 is formed off-center (offset) (see Figures 1 and 3).

[0035] As shown in Figure 4, both ends 32 of the base steel frame 30 in the direction of the material axis are rested on the lower flange 26 of the steel beam 20. Also, as shown in Figures 1 to 3, the holding parts 110 of the fasteners 100 are passed through both sides of the base steel frame 30. The ends 32 of the base steel frame 30 are sandwiched between the lower flange 26 of the steel beam 20 and the upper overhang plate portion 134 of the upper overhang portion 130 of the holding part 110. Furthermore, the lower overhang plate portion 146 of the lower overhang portion 140 of the holding part 110 is located below the lower surface 26A of the lower flange 26.

[0036] Then, by screwing the bolt 160 into the screw hole 147 of the lower overhang plate portion 146, the upper overhang plate portion 134 presses the end 32 of the base steel frame 30 against the lower flange 26 of the steel beam 20, and the end 32 of the base steel frame 30 is fixed to the lower flange 26 of the steel beam 20. In this embodiment, nuts 168 are used to sandwich the lower overhang plate portion 146 (see Figures 1 and 2) from above and below to prevent the bolt 160 from loosening, but the nuts 168 are not required.

[0037] Furthermore, in this embodiment, as described above, a disc spring nut 200 is attached to the tip of the screw bolt 160. As shown in Figure 5, the disc spring nut 200 in this embodiment integrates a disc spring washer 204, which is an example of a disc spring, into a nut 202, and the elastic effect of the disc spring washer 204 absorbs vibrations to prevent or suppress loosening of the screw.

[0038] In this embodiment, the disc spring washer 204 side of the disc spring nut 200 is mounted facing the lower surface 26A side of the lower flange 26 (see Figures 2 and 3). Generally, the disc spring nut 200 is mounted with the disc spring washer side facing the head side of the screw bolt, but in this embodiment, it is mounted in the opposite direction.

[0039] Furthermore, in this embodiment, the tapping screw 169 inserted through the screw hole 123 (see Figure 3) in one side plate portion 122 of the main body portion 120 of the holding portion 110 penetrates the underlying steel frame 30, so that the holding portion 110 and the underlying steel frame 30 are firmly integrated. Note that it is not necessary to fix it with the tapping screw 169.

[0040] Furthermore, a pair of fixing members 102, each positioned on either side of the web 24 of the steel beam 20 in the X direction, are connected by connecting bolts 170 inserted through bolt holes 155 formed in the connecting plate portion 154 of the connecting portion 150. The connecting bolts 170 consist of a bolt 172 having a threaded shaft portion 174 and a head portion 176, and a nut 178.

[0041] Then, the shaft portion 174 of the bolt 172, which is inserted through the bolt hole 155 of one connecting plate portion 154, is inserted through the bolt hole 155 of the other connecting plate portion 54 and fastened with a protruding nut 178, thereby connecting the pair of fixing members 102. When the nut 178 is tightened, the side plate portions 122 of the main body portion 120 of the pair of fixing members 102 are firmly fixed, sandwiching the lower flange 26 from both sides in the X direction.

[0042] Here, as shown in Figure 4, the base steel frame 30 is stretched across steel beams 20 that are spaced apart in the X direction. The rightmost steel beam 20 in Figure 4 is located near a wall, and there are no steel beams 20 to the right of it. Therefore, the end 32 of the base steel frame 30 is not resting on the right side of the lower flange 26 of the rightmost steel beam 20.

[0043] Therefore, in this embodiment, an end-type base steel frame 36, which has the same shape as the end 32 of the base steel frame 30, is placed on the right side of the lower flange 26 of the rightmost steel beam 20. The end-type base steel frame 36 is held and fixed by one fixing member 102, and is connected to the other fixing member 102 that holds and fixes the end 32 of the base steel frame 30 on the left side of the lower flange 26. As a result, even the very end can be fixed with a pair of fixing members 102, and a similar effect can be expected. The end-type base steel frame 36 is also an example of a base steel frame.

[0044] <effect> Next, the operation of this embodiment will be described.

[0045] The fixing member 102 of the fixing device 100 holds the end portion 32 of the base steel frame 30 which is resting on the lower flange 26 of the steel beam 20, and the end portion 32 is fixed to the lower flange 26 by tightening the screw bolt 160 which is screwed into the screw hole 147 formed in the lower overhang plate portion 146. In other words, the base steel frame 30 can be fixed to the steel beam 20 without welding the base steel frame 30 to the steel beam 20. Therefore, for example, protective measures using fire during welding work become unnecessary.

[0046] The pair of fixing members 102 on both sides of the web 24 are connected by connecting bolts 170, so that displacement due to vibrations during an earthquake is suppressed and detachment is prevented or suppressed. Specifically, by tightening the nuts 178 of the connecting bolts 170, the side plate portions 122 of the main body portion 120 of the pair of fixing members 102 are firmly fixed by sandwiching the lower flange 26 from both sides in the X direction.

[0047] Furthermore, even if one of the fixing members 102 attempts to shift outward in the X direction, which is the axis direction of the underlying steel frame 30, the side plate portion 122 of the main body portion 120 of the other fixing member 102 contacts the lower flange 26, preventing the shift. In other words, the fixing device 100 has high performance in preventing detachment during earthquakes.

[0048] Furthermore, by attaching a disc spring nut 200 to the tip of the screw bolt 160, the frictional force is increased by the spring force of the disc spring washer 204, making it less likely to shift during an earthquake.

[0049] From another perspective, the fastener 100 allows for the secure attachment of the base steel frame 30 to the existing steel beam 20 without requiring any processing such as drilling holes for bolt fixation or welding the base steel frame 30 to the existing steel beam 20.

[0050] <Other> Furthermore, the present invention is not limited to the embodiments described above.

[0051] For example, in the above embodiment, the base steel frame 30 was channel steel (C-shaped steel), but it is not limited to this. The base steel frame 30 can be any type. The structure of the fastener 100, such as the holding part 110, can be appropriately designed to match the shape of the base steel frame 30.

[0052] Furthermore, for example, in the above embodiment, the underlying steel frames 30 on both sides of the steel beam 20 were the same, but this is not limited to this. The underlying steel frames 30 on both sides of the steel beam 20 may have different shapes. In that case, the structure and other aspects of one of the pair of fixing members 102 of the fixing device 100 may be different from the other.

[0053] Furthermore, in the above embodiment, for example, the underlying steel frame 30 on both sides of the steel beam 20 was held and fixed by a pair of fixing members 102, and the pair of fixing members 102 were connected by connecting bolts 170, but the configuration is not limited to this. The fixing members 102 may not be connected by connecting bolts 170.

[0054] Furthermore, the present invention can be implemented in various forms without departing from the spirit of the invention. Multiple embodiments and modifications can be combined as appropriate. [Explanation of Symbols]

[0055] 10 Fixed structure 20. Steel beam (an example of a steel structural member) 24 Web 26 Lower flange 26A Bottom 30 Steel frame substructure 32 End 36. Steel frame for end sections (an example of steel frame) 100 Fixtures 102 Fixing member 146. Lower protruding bottom plate section (an example of a bottom plate section) 147 screw holes 160 Screw bolt 170 connecting bolts 200 Disc spring nuts 204 Disc spring washer (an example of a disc spring part)

Claims

1. The lower steel frame, whose end rests on the flange of the steel frame member, is held in place, and the end is secured to the flange by tightening a bolt that is screwed into a threaded hole formed in the bottom plate portion facing the lower surface of the flange. Fixing member.

2. A nut with a disc spring, with the disc spring portion facing upwards, is attached to the tip of the bolt so as to contact the lower surface of the flange. The fixing member according to claim 1.

3. A pair of fixing members according to claim 1 or 2, which are positioned on both sides of the web of a steel frame member and which hold a pair of base steel frames whose ends rest on the flange and fix them to the flange, A connecting bolt that connects the pair of aforementioned fixing members, A fastener equipped with the following features.

4. Steel frame members and A pair of base steel frames are positioned on both sides of the web of the steel frame member, with their ends resting on the flange of the steel frame member, The fastener according to claim 3, wherein a pair of fixing members each hold a pair of the base steel frames and fix the ends to the lower flange, A fixed structure for the underlying steel frame equipped with [a specific feature / feature].

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