Flooring fixing structure and fixing hardware

Abstract

To provide a fixing structure of a floor material which can prevent excess fastening of a bolt.SOLUTION: There is provided a fixing structure of a floor material for fixing a floor material 1 to a structural material by a fixing metal fitting 3. The fixing metal fitting 3 includes an upper metal fitting 30, a lower metal fitting 40, and a bolt 50. The bolt 50 is fastened to a screw hole 43a of the lower metal fitting 40 through a bolt installation plate 31 while engaging the engagement part of the upper metal fitting 30 with the floor material 1, which pulls the lower metal fitting 40 up, engages a lower side part 42 with the lower surface side of the structural material, and fixes the floor material 1 to the structural material. A contact engagement piece 6 arranged above the lower side part 42 of the lower metal fitting 40 is provided on the upper metal fitting 30, an inclination suppression piece 38 corresponding to the contact engagement piece 6 is provided on the lower metal fitting 40, and the contact engagement piece 38 is brought into contact with and engaged with the inclination suppression piece 6, which suppresses inclination to the upper metal fitting 30 of the lower metal fitting 40 accompanying excess fastening of the bolt 50.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a floor material fixing structure for fixing floor materials such as grating materials to structural materials such as beams, and to a fixing metal fitting for fixing floor materials. [Background technology]

[0002] When forming floor structures such as floors, passageways, and steps at a predetermined height in factories, laboratories, warehouses, etc., a well-known fixing structure for floor materials is one in which floor materials such as lattice-shaped metal grating materials with many long holes formed in the treads are laid side by side on structural materials such as beams and fixed with fixing metal fittings (Patent Document 1).

[0003] The fixing fittings used in such flooring fixing structures comprise an upper fitting that engages with the flooring, a lower fitting that engages with the beam, and a bolt that connects the upper and lower fittings together. The flooring is fixed to the beam by engaging the upper fitting with the flooring and fastening the upper and lower fittings together in a proximity direction with the bolt. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6427139 Summary of the Invention [Problem to be solved by the invention]

[0005] In the floor fixing structure shown in Patent Document 1, the fixing brackets are usually temporarily attached to the floor and beams, and then the bolts are finally tightened using a power tool, but tightening the bolts using a power tool poses the problem that the bolts may be overtightened to the point where the lower bracket is undesirably tilted relative to the upper bracket, etc., and the fixing bracket may not be assembled in the correct state. In such cases, for example, the axis of the bolt may be misaligned with the axis of the bolt hole (screw hole) in the lower bracket, causing the screw groove (thread) of the screw hole to become crushed, making it difficult to remove the fixing bracket or to reuse the fixing bracket.

[0006] This invention was made in consideration of the above-mentioned problems, and aims to provide a flooring fixing structure and fixing hardware that can prevent over-tightening of the bolts of the fixing hardware and ensure that the fixing hardware can be assembled in the correct state. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention comprises the following means.

[0008] [1] A flooring fixing structure in which flooring is fixed to a structural material with fixing brackets, The fixing bracket includes an upper bracket, a lower bracket, and a bolt, The upper fitting has an upper fitting body arranged along a side surface of the lower fitting, a bolt installation plate arranged above the lower fitting, and an engagement portion that can engage with the floor material, the lower fitting has a screw hole provided corresponding to the bolt installation plate and a lower side portion whose tip side can be arranged below the structural material, The engaging portion of the upper fitting engages with the floor material, and the bolt is inserted through the bolt installation plate and fastened to the screw hole of the lower fitting, whereby the lower fitting is pulled up and the lower edge portion engages with the underside of the structural material, thereby fixing the floor material to the structural material. The upper metal fitting is provided with an abutment locking piece that is arranged above the lower side portion of the lower metal fitting, The lower fitting is provided with a tilt suppression piece corresponding to the abutment locking piece, A fixing structure for flooring, characterized in that the abutment engagement piece abuts and engages with the tilt suppression piece, thereby suppressing tilt of the lower fitting relative to the upper fitting due to over-tightening of the bolt.

[0009] [2] The lower metal fitting has the lower side portion and an upper side portion arranged parallel to the lower side portion, and the base ends of the upper side portion and the lower side portion are connected to each other to form a U-shape in side view, the tilt suppression piece is provided so as to bridge between the upper side portion and the lower side portion of the lower metal fitting, 2. The flooring fixing structure according to claim 1, wherein the screw holes are provided in the upper edge portion.

[0010] [3] A fixing structure for a flooring material as described in the preceding paragraph 1 or 2, in which the abutting engagement piece is provided on the base end side of the tilt suppression piece.

[0011] [4] The flooring fixing structure according to any one of the preceding paragraphs 1 to 3, wherein the abutting and locking piece has a bolt insertion hole through which the lower part of the bolt is inserted.

[0012] [5] The floor material has a tread having a plurality of long holes arranged in parallel, and a rib is formed at the side edge of each long hole so that it protrudes to the back side, and an insertion hole is provided in the rib, The engagement portion of the upper fitting is constituted by an insertion piece provided on the bolt installation plate, and the insertion piece is inserted into the insertion hole to engage with the floor material, 5. A floor material fixing structure according to any one of claims 1 to 4, wherein the fixing metal fittings are configured to be positioned lower than the surface of the tread when the floor material is fixed to the structural material.

[0013] [6] The fixing member in a provisionally assembled state in which the bolt is inserted and placed in the bolt installation plate of the upper fitting and fastened to the screw hole of the lower fitting has a shape that can be inserted into the elongated hole, The fixing structure for flooring described in the preceding paragraph 5 is configured so that the fixing bracket in a pre-assembled state, which is inserted through a long hole and positioned lower than the surface of the tread, is rotated around the axis of the bolt so that the insertion piece is inserted into the insertion hole and the lower edge portion is positioned below the structural material.

[0014] [7] A flooring fixing structure according to any one of the preceding paragraphs 1 to 6, wherein the bolt installation plate is provided with a set washer for temporarily holding the bolt inserted therethrough at a desired position.

[0015] [8] A metal fitting for fixing flooring to a structural material, Equipped with upper fittings, lower fittings and bolts, The upper fitting has an upper fitting body arranged along a side surface of the lower fitting, a bolt installation plate arranged above the lower fitting, and an engagement portion that can engage with the floor material, the lower fitting has a screw hole provided corresponding to the bolt installation plate and a lower side portion whose tip side can be arranged below the structural material, The engaging portion of the upper fitting engages with the floor material, and the bolt is inserted through the bolt installation plate and fastened to the screw hole of the lower fitting, whereby the lower fitting is pulled up and the lower edge portion engages with the underside of the structural material, thereby fixing the floor material to the structural material. The upper metal fitting is provided with an abutment locking piece that is arranged above the lower side portion of the lower metal fitting, The lower fitting is provided with a tilt suppression piece corresponding to the abutment locking piece, This is a fixing bracket for flooring, characterized in that the abutment engagement piece abuts and engages with the tilt suppression piece, thereby suppressing tilt of the lower fitting relative to the upper fitting due to over-tightening of the bolt. [Effects of the Invention]

[0016] According to the flooring fixing structures of inventions [1] to [3], the abutment locking piece of the upper fitting abuts and locks against the tilt suppression piece of the lower fitting, thereby suppressing tilt of the lower fitting relative to the upper fitting due to overtightening of the bolt, thereby preventing overtightening of the bolt. As a result, for example, the fixing fitting, especially the lower fitting, can be assembled in the correct state, preventing problems such as damage to the screw hole in the lower fitting.

[0017] According to the flooring fixing structure of invention [4], the lower part of the bolt is inserted into the bolt insertion hole of the abutting and locking piece in the upper fitting, so that the lower part of the bolt can be guided / supported by the abutting and locking piece, and the bolt can be assembled in a more stable state.

[0018] According to the flooring fixing structure of invention [5], the fixing brackets are positioned lower than the surface of the treads, so that the entire flooring can be finished to a flat surface.

[0019] According to the floor material fixing structure of invention [6], the floor material can be fixed to the structural material by simply inserting the fixing bracket into the long hole in the tread, rotating it, and then tightening the bolt from one direction, ensuring excellent workability.

[0020] According to the flooring fixing structure of invention [7], the bolt can be held at the desired height by the set washer, so that by grasping the bolt, the fixing hardware can be easily handled, and thus the flooring fixing work can be performed efficiently and easily.

[0021] According to the fixing hardware for flooring of invention [8], the fixing hardware constituting the main part of invention [1] is specified, so that the same effect as above can be obtained. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a perspective view showing a floor material fixing structure according to an embodiment of the present invention with fixing metal fittings removed. [Figure 2]FIG. 2 is a perspective view showing the fixing structure of the flooring material according to the embodiment. [Figure 3] FIG. 3 is a side cross-sectional view showing the state immediately after the fastening metal fittings are inserted into the flooring fixing structure of the embodiment. [Figure 4] FIG. 4 is a side cross-sectional view showing the state immediately after the fixing metal fitting has been rotated in the floor material fixing structure of the embodiment. [Figure 5] FIG. 5 is a side cross-sectional view showing the fixing structure of the flooring material according to the embodiment. [Figure 6] FIG. 6 is an exploded perspective view of the fixing bracket according to the embodiment. [Figure 7] FIG. 7 is a side cross-sectional view showing a fixing structure for a floor material when the fixing metal fittings of the embodiment are used in another form. [Figure 8] FIG. 8 is a side cross-sectional view showing a flooring fixing fixture according to a modified example of the present invention. [Figure 9] FIG. 9 is a side cross-sectional view showing a fixing structure for a floor material according to a reference example. DETAILED DESCRIPTION OF THE INVENTION

[0023] 1 and 2 are perspective views illustrating a floor material fixing structure according to an embodiment of the present invention, and FIGS. 3 to 5 are side cross-sectional views illustrating the floor material fixing structure according to the embodiment.

[0024] As shown in these figures, in this embodiment, the flooring 1 is composed of a lip groove material (the flooring body) made of steel plate that has flanges with lips 15 on both widthwise edges (side edges) of the tread 10. The plate-like tread 10 has a plurality of oblong or elliptical (bamboo leaf shaped) long holes 11 that extend in the widthwise direction of the tread 10 and are arranged in parallel (horizontal) along the length.

[0025] Ribs 12 are integrally formed on both side edges (long sides) of the elongated hole 11 in the tread 10, protruding toward the rear surface side.

[0026] Three slit-shaped insertion holes 13 extending in the long side direction are formed in the ribs 12 on both sides and arranged in a vertical row in the long side direction.

[0027] The flooring material 1 having the above-described configuration is laid in a parallel arrangement on the beam material 2, and each flooring material 1 is fixed to the beam material 2 by the fixing brackets 3 described below, thereby forming the fixed structure of the flooring material of this embodiment.

[0028] As shown in Figure 1, the opening dimension of the elongated hole 11 in the flooring material 1 in the length direction (longitudinal direction) is "P1", the opening dimension of the elongated hole 11 in the width direction (short direction) is "P2", and the opening dimension of the insertion hole 13 in the width direction (height direction) is "P3".

[0029] The beam 2 is made of an H-shaped steel or I-shaped steel having a flange 21 on the web 20, and the flooring material 1 of this embodiment is installed on the flange 21. In this embodiment, the beam 2, specifically the flange 21, is configured as a structural material.

[0030] Figure 6 is an exploded perspective view of the fixing bracket 3. As shown in Figures 1 to 6, the fixing bracket 3 includes an upper fitting 30 that engages with the floor material 1, a lower fitting 40 that engages with the beam material 2, and a bolt 50 that connects the upper fitting 30 and the lower fitting 40.

[0031] The upper fitting 30 has a bolt installation plate 31 provided at its upper end and arranged horizontally, and an upper fitting main body 32 which contacts the side of the lower fitting 40 to regulate the posture of the lower fitting 40 relative to the upper fitting 30, and is arranged vertically so that its lower end can abut against the beam material 2, and the bolt installation plate 31 and the upper fitting main body 32 are formed integrally via a neck portion 36.

[0032] The bolt installation plate 31 has a bolt insertion hole 31a drilled in the center for inserting and placing the bolt 50, and both ends are configured as insertion pieces (engagement portions) 35 that can be inserted and placed into the insertion hole 13 of the floor material 1.

[0033] A bent piece 38 is formed at the lower end of the upper fitting body 32, bent in the same direction as the bolt installation plate 31. This bent piece 38 is configured as a contact locking piece, and has a bolt insertion hole 38a drilled therein for inserting and guiding / supporting the lower part of the bolt 50.

[0034] One side (tip side) of the bent piece 38 at the lower end edge of the upper metal fitting body 32 is cut out in a sawtooth shape to form a notch 39, and the side (base end side) where the notch 39 is not formed is cut away.

[0035] As shown in Fig. 6, the lengthwise dimension of the bolt installation plate 31 of the upper fitting 30 is "Q1", and the widthwise (short-side) dimension is "Q2". The lengthwise dimension of the upper fitting body 32 is "Q3", which is larger than the lengthwise dimension "Q1" of the bolt installation plate 31. Furthermore, since the upper fitting body 32 protrudes from the widthwise (short-side) dimension of the bolt installation plate 31 by the plate thickness, the widthwise (short-side) dimension Q4 of the upper fitting 30 is larger than the widthwise dimension Q2 of the bolt installation plate 31. Therefore, the top surface dimension of the upper fitting 30 is the lengthwise direction Q3 × the widthwise direction Q4.

[0036] The upper fitting 30 is produced by cutting out a metal plate with a thickness of Q5 to a predetermined outline, and bending the bolt installation plate 31 and the bent piece 38 onto the upper fitting body 32.

[0037] The lower fitting 40 is a member formed in a U-shape in side view, with an upper side portion 41 and a lower side portion 42 arranged in parallel and joined at the base end, and is configured so that the flange 21 of the beam material 2 can be inserted into the U-shaped groove between the upper side portion 41 and the lower side portion 42. Two screw holes 43a, 43b that screw into the bolt 50 are formed side by side in the longitudinal direction in the upper side portion 41. Of the two screw holes 43a, 43b, one screw hole 43b is formed approximately in the center of the upper side portion 41 in the longitudinal direction, and the other screw hole 43a is formed in a position closer to the base end.

[0038] In addition, a tilt suppression piece 6 is integrally formed along the vertical direction so as to bridge between the upper side portion 41 and the lower side portion 42, and this tilt suppression piece (partition portion) 6 divides the U-shaped groove of the lower fitting 40 into a base end side and a tip end side between the two screw holes 43a, 43b. In this embodiment, the U-shaped groove of the lower fitting 40, at the base end side of the tilt suppression piece 6, is configured as an opening 61 that is rectangular in side view. In addition, a notch 47 is formed by cutting out in a sawtooth shape at the upper edge of the tip end of the lower side portion 42.

[0039] In this embodiment, the lower metal fitting 40 is formed by bending a blank plate of a predetermined shape that has been punched out into a downward U-shape. In this embodiment, the screw holes 43a, 43b are formed in the intermediate connecting plate portion of this U-shaped molded product, and the upper side portion 41, lower side portion 42, notch 47, tilt suppression piece 6, and opening 61 are formed in the bent plate portions on both sides, correspondingly.

[0040] 6, the lengthwise dimension of the lower metal fitting 40 is "R1," and the widthwise dimension (short side direction) is "R2." Because the lower side portion 42 is longer than the upper side portion 41, the lengthwise dimension of the lower side portion 42 is equal to the lengthwise dimension "R1" of the lower metal fitting 40.

[0041] In addition, a nylon set washer 55 is attached to the back side (lower side) of the bolt installation plate 31 of the upper fitting 30, corresponding to the bolt insertion hole 34a, to hold the bolt 50 in any insertion position.

[0042] In the fixing bracket 3 of this embodiment, the upper fitting 30 and the lower fitting 40 are arranged overlapping each other such that the bolt insertion hole 34a of the upper fitting 30 faces one of the threaded holes 43a, 43b of the lower fitting 40, for example the base-end threaded hole 43a, and the bent piece 38 of the upper fitting 30 is inserted into the base-end side (opening 61) of the tilt suppression piece 6 within the U-shaped groove of the lower fitting 40, and further in this state, the bolt 50 inserted through the bolt insertion hole 34a of the upper fitting 30 and the set washer 55 is screwed into the threaded hole 43a of the lower fitting 40 and inserted into the bolt insertion hole 38a of the bent piece 38 of the upper fitting 30. As a result, the upper fitting 30, the lower fitting 40, and the bolt 50 are connected without being separated from each other, and are in a pre-assembled state. In this temporarily assembled state of the fixing bracket 3, the main body 32 of the upper bracket 30 abuts and engages with the side surface of the lower bracket 40, restricting movement of the lower bracket 40 around the bolt axis relative to the upper bracket 30, and the notch 39 of the upper bracket 30 is positioned above and spaced apart from the notch 47 of the lower bracket 40.

[0043] The threaded holes 43a, 43b of the lower fitting 40 into which the bolt 50 is screwed may be selected as appropriate according to the relative positions of the elongated hole 11 of the tread 10 and the flange 21 so that the flange 21 of the beam 2 of the lower fitting 40 can be sandwiched between them. For example, when temporarily assembling by threading the bolt 50 into the threaded hole 43b on the tip side, the bent piece 38 of the upper fitting 30, through which the lower end of the bolt 50 is inserted, will be positioned closer to the tip side than the tilt suppression piece 6 within the U-shaped groove of the lower fitting 40 (see Figure 7).

[0044] When viewed from above (plan), the fixing fitting 3 in the temporarily assembled state has a length dimension equal to the length dimension R1 of the lower fitting 40 and a width dimension equal to the width dimension Q4 of the upper fitting 30.

[0045] In this embodiment, the dimensions of each part of the fixing bracket 3 are set so as to satisfy the following size relationships with the dimensions of each part of the floor material 1 and the beam material 2.

[0046] The lengthwise dimension R1 of the fixing bracket 3 is set smaller than the lengthwise opening dimension P1 of the elongated hole 11 in the tread 10 of the floor material 1, but larger than the widthwise opening dimension P2. The widthwise dimension Q4 of the fixing bracket 3 is set smaller than the widthwise opening dimension P2 of the elongated hole 11. Furthermore, the lengthwise dimension Q1 of the bolt installation plate 31 of the fixing bracket 3 is set larger than the widthwise opening dimension P2 of the elongated hole 11, and the plate thickness Q5 of the bolt installation plate 31 is set smaller than the widthwise (short side) opening dimension P3 of the insertion hole 13 of the rib 12.

[0047] In this embodiment, the flooring material 1 is fixed to the beam material 2 using the fixing bracket 3 having this configuration in the following procedure.

[0048] That is, multiple flooring materials 1 are placed in parallel across the beams 2, with the lengthwise direction of the beams 2 and the lengthwise direction of the flooring materials 1 perpendicular to each other in a horizontal plane. The fixing bracket 3 is preassembled as described above by assembling the upper bracket 30, the lower bracket 40, and the bolt 50. At this time, the bolt 50 is appropriately screwed into the threaded hole 43a of the lower bracket 40, and the distance from the bolt installation plate 31 of the upper bracket 30 to the U-shaped groove of the lower bracket 40 is adjusted to be approximately equal to the distance from the insertion hole 13 of the flooring material 1 to the flange 21 of the beams 2. In this embodiment, the head of the bolt 50 is kept slightly elevated above the bolt installation plate 31 by a set washer 55 arranged on the underside of the bolt installation plate 31 (see Figure 1, etc.).

[0049] 1 and 3, the length of the fixing bracket 3 is aligned with the length of the slot 11 in the tread 10 of the flooring 1, and the fixing bracket 3 is inserted into the slot 11 from the top side of the tread 10. Because the planar dimensions Q3 × Q4 of the fixing bracket 3 are smaller than the opening dimensions P1 × P2 of the slot 11, the entire fixing bracket 3 can be inserted into the slot 11 without difficulty.

[0050] Next, as shown in Figure 4, the inserted fixing bracket 3 is rotated 90° around the axis of the bolt 50 (around the vertical axis) in a plane parallel to the tread 10. This rotation of the fixing bracket 3 makes the length direction of the elongated hole 11 perpendicular to the length direction of the fixing bracket 3, as shown in Figures 2 and 4, and the insertion pieces 35 on both ends of the bolt installation plate of the upper fitting 30 are inserted into the insertion holes 13 of the opposing ribs 12, the flange 21 of the beam material 2 is inserted into the U-shaped groove of the lower fitting 40, and the upper fitting body 32 is positioned above the flange 21 and the lower side 42 of the lower fitting 40 is positioned below the flange 21.

[0051] In this embodiment, the head of the bolt 50 is positioned in a raised position by the set washer 55, making it easy for the worker to grasp the head of the bolt 50. Therefore, while grasping the head of the bolt 50, the worker can easily insert the bolt 50 into the elongated hole 11 of the fixing bracket 3 and rotate the fixing bracket 3.

[0052] Since the longitudinal dimension Q1 of the bolt installation plate 31 in the upper fitting 30 is larger than the widthwise opening dimension P2 of the elongated hole 11, i.e., the distance between the opposing ribs 12, the insertion pieces 35 at both ends of the bolt installation plate are positioned so as to penetrate the opposing insertion holes 13.

[0053] Next, as shown in Figure 5, the bolt 50 is rotated in the fastening direction. At this time, because the rotation of the lower fitting 40 around the axis of the bolt 50 is restricted by the upper fitting 30, as the bolt 50 rotates, the lower fitting 40 is pulled upward and approaches the upper fitting 30. Meanwhile, both ends of the bolt installation plate 31 of the upper fitting 30 are inserted into the insertion holes 13 and are constrained in the vertical direction, so that the notches 47 of the lower edge portion 42 of the raised lower fitting 40 bite into the back surface (lower surface) of the flange 21 of the beam 2, and the upper fitting 30 is pressed down from above, so that the notches 39 of the upper fitting body 32 bite into the upper surface of the flange 21. In this way, the floor material 1 tightly engages with the bolt installation plate 31 of the upper fitting 30 of the fixing fitting 3, while the beam 2 tightly engages with the lower edge portion 42 of the lower fitting 40 from below, and the floor material 1 is fixed to the beam 2 via the fixing fitting 3.

[0054] Here, since the tightening work of the bolt 50 is generally performed using an electric tool, there is a possibility that the bolt 50 may be tightened more than necessary. However, in this embodiment, a tilt suppression piece 6 is formed in a bridge-like shape in the U-shaped groove of the lower fitting 40, and the bent piece 38 of the upper fitting 30 is positioned opposite the base end side of the tilt suppression piece 6, so that the bent piece 38 abuts and engages with the tilt suppression piece 6, thereby preventing the bolt 50 from being tightened too much.

[0055] That is, if the tilt suppression piece 6 is not formed on the lower fitting 40, and the bolt 50 is tightened too firmly with a power tool as shown in Fig. 9, the lower fitting 40 will be pulled upward more than necessary, and the lower fitting 40 will unintentionally tilt so as to rotate clockwise in the figure relative to the upper fitting 30, beam 2, etc. If this happens, for example, the axis of the screw hole 43a of the lower fitting 40 will tilt relative to the bolt axis, damaging the threads (threads) of the screw hole 43a, making it impossible to remove the bolt 50 from the screw hole 43a, and thus making it impossible to remove the fixing fitting 3, or causing problems such as the fixing fitting 3 not being reusable.

[0056] In contrast to this, in this embodiment, the tilt suppression piece 6 is formed on the lower fitting 40 so as to face the bent piece 38 of the upper fitting 30, so that if the lower fitting 40 inadvertently rotates and tilts from the correct state due to overtightening of the bolt 50, the bent piece 38 of the upper fitting 30 abuts and engages with the tilt suppression piece 6 of the lower fitting 40, thereby preventing the lower fitting 40 from rotating inadvertently. This makes it possible to reliably prevent the bolt 50 from being tightened more than necessary, allowing the lower fitting 40 to be connected to the upper fitting 30, etc. in the correct position, and reliably preventing problems such as damage to the threads of the screw hole 43a.

[0057] Furthermore, in the flooring fixing structure of this embodiment, the fixing bracket 3 is sized to be able to be inserted through the elongated hole 11 of the tread 10, and the entire fixing bracket 3 can be positioned lower than the top surface of the tread 10 and engage with the flooring 1. Therefore, when the flooring 1 is fixed to the beam 2 with the fixing bracket 3, the fixing bracket 3 does not protrude from the top surface of the tread 10, and the flatness of the tread 10 is not impaired. Furthermore, because the fixing bracket 3 does not protrude, a good aesthetic appearance is also ensured.

[0058] The work of engaging the fixing bracket 3 with the floor material 1 and the beam material 2 involves inserting the fixing bracket 3 through the elongated hole 11 in the tread 10, rotating the fixing bracket 3, and tightening the bolt 50. All of these operations are one-way operations that can be performed from the top side of the tread 10, ensuring excellent workability.

[0059] In the above embodiment, the bolt 50 of the fixing bracket 3 is fastened to the threaded hole 43a on the base end (rear side) of the lower fitting 40. However, even when the bolt 50 is fastened to the threaded hole 43b on the tip end (front side) of the lower fitting 40, it is possible to prevent the bolt 50 from being overtightened. That is, when the flooring material 1 is fixed to the beam 2 by the fixing bracket 3 with the bolt 50 fastened to the threaded hole 43b on the tip end of the lower fitting 40 as shown in FIG. 7, the horizontal distance between the fastening position of the bolt 50 and the engagement position of the lower fitting 40 with the beam 2 is short. Therefore, even when the bolt 50 is fastened to the threaded hole 43b on the tip end of the lower fitting 40 as shown in FIG. 7, the bent piece 38 abuts and engages with the tilt suppression piece 6, thereby reliably suppressing even a slight tilt of the lower fitting 40 and preventing overtightening of the bolt 50.

[0060] When the bolt 50 is fastened to the threaded hole 43b on the tip side of the lower fitting 40, the bent piece 38 of the upper fitting 30 is disposed on the tip side (front side) of the tilt suppressing piece 6 of the lower fitting 40, so that the rear edge of the bent piece 38 abuts and engages with the tilt suppressing piece 6. In short, in the present invention, the bent piece (abutting and engaging piece) 38 of the upper fitting 30 may be on the base end side (rear side) of the tilt suppressing piece 6 as in the embodiment shown in FIG. 5 above, or on the tip side (front side) of the tilt suppressing piece 6 as in the other usage form shown in FIG. 7 above. However, in the present invention, when the bolt 50 is fastened to the threaded hole 43a on the base end side of the lower fitting 40 as in the embodiment shown in FIG. 5 above, the horizontal distance between the fastening position of the bolt 50 and the engagement position of the lower fitting 40 with the beam 2 is longer, so that the tilt of the lower fitting 40 due to over-tightening of the bolt becomes more noticeable, and therefore the effect of suppressing tilt, i.e., the effect of preventing over-tightening of the bolt, can be more reliably obtained. In other words, it is even more preferable to employ the configuration of the present invention, particularly when fastening the bolt 50 to the threaded hole 43a on the base end side of the lower fitting 40.

[0061] In the fixing bracket 3 of the above embodiment, a set washer 55 is attached to the back side of the bolt installation plate 31 of the upper bracket 30 so that the head of the bolt 50 can be held in a raised position, but this is not limited to this. In the present invention, instead of the set washer 55, a retaining ring 56 for preventing the bolt from coming out can also be attached to the lower end of the bolt 50, as shown in Figure 9. [Industrial Applicability]

[0062] The flooring fixing structure of the present invention can be suitably used when forming floors, passageways, steps, etc. at a predetermined height in factories, laboratories, warehouses, etc. [Explanation of symbols]

[0063] 1: Flooring 10:Treadboard 11: Long hole 12: Rib 13: Insertion hole 21: Flange (structural material) 3: Fixing bracket 30: Upper metal fittings 31: Bolt installation plate 31a: Bolt insertion hole 32: Upper bracket body 35: Insertion piece (engagement part) 38: Bending piece (abutting locking piece) 38a: Bolt insertion hole 40: Lower bracket 41: Top 42: Bottom 43a: screw hole 43b: screw hole 50: Bolt 55: Set washer 6: Slope suppression piece

Claims

1. A floor material fixing structure in which floor materials are fixed to structural materials with fixing metal fittings, The fixing bracket includes an upper bracket, a lower bracket, and a bolt, The upper fitting has an upper fitting body arranged along a side surface of the lower fitting, a bolt installation plate arranged above the lower fitting, and an engagement portion that can engage with the floor material, the lower fitting has a screw hole provided corresponding to the bolt installation plate and a lower side portion whose tip side can be arranged below the structural material, The engaging portion of the upper fitting engages with the floor material, and the bolt is inserted through the bolt installation plate and fastened to the screw hole of the lower fitting, whereby the lower fitting is pulled up and the lower edge portion engages with the underside of the structural material, thereby fixing the floor material to the structural material. The upper metal fitting is provided with an abutment locking piece that is arranged above the lower side portion of the lower metal fitting, The lower fitting is provided with a tilt suppression piece corresponding to the abutment locking piece, A fixing structure for flooring, characterized in that the abutment engagement piece abuts and engages with the tilt suppression piece, thereby suppressing tilt of the lower fitting relative to the upper fitting due to over-tightening of the bolt.

2. The lower metal fitting has the lower side portion and an upper side portion arranged parallel to the lower side portion and above the lower side portion, and is formed in a U-shape in side view with base ends of the upper side portion and the lower side portion connected to each other, the tilt suppression piece is provided so as to bridge between the upper side portion and the lower side portion of the lower metal fitting, The flooring fixing structure according to claim 1 , wherein the screw holes are provided in the upper side portion.

3. 3. The flooring fixing structure according to claim 1, wherein the contact and locking piece is provided on the base end side of the tilt suppressing piece.

4. 4. The flooring fixing structure according to claim 1, wherein the contact locking piece has a bolt insertion hole through which the lower part of the bolt is inserted.

5. The floor material has a tread plate with a plurality of long holes arranged in parallel, and ribs are formed at the side edges of each long hole so that they protrude toward the back surface, and insertion holes are formed in the ribs. The engagement portion of the upper fitting is constituted by an insertion piece provided on the bolt installation plate, and the insertion piece is inserted into the insertion hole to engage with the floor material, A floor material fixing structure as described in any one of claims 1 to 4, wherein the fixing metal fittings are configured to be positioned lower than the surface of the tread when the floor material is fixed to the structural material.

6. the fixing member in a provisionally assembled state in which the bolt is inserted and disposed in the bolt installation plate of the upper fitting and fastened to the screw hole of the lower fitting has a shape that can be inserted into the elongated hole, The fixing structure for flooring material described in claim 5, wherein the fixing bracket in a pre-assembled state, which is inserted through a long hole and positioned lower than the surface of the tread, is rotated around the axis of the bolt so that the insertion piece is inserted into the insertion hole and the lower edge portion is positioned below the structural material.

7. 7. The flooring fixing structure according to claim 1, wherein the bolt installation plate is provided with a set washer for temporarily holding the bolt inserted therethrough at a desired position.

8. A floor material fixing bracket for fixing a floor material to a structural material, Equipped with upper fittings, lower fittings and bolts, The upper fitting has an upper fitting body arranged along a side surface of the lower fitting, a bolt installation plate arranged above the lower fitting, and an engagement portion that can engage with the floor material, the lower fitting has a screw hole provided corresponding to the bolt installation plate and a lower side portion whose tip side can be arranged below the structural material, The engaging portion of the upper fitting engages with the floor material, and the bolt is inserted through the bolt installation plate and fastened to the screw hole of the lower fitting, whereby the lower fitting is pulled up and the lower edge portion engages with the underside of the structural material, thereby fixing the floor material to the structural material. The upper metal fitting is provided with an abutment locking piece that is arranged above the lower side portion of the lower metal fitting, The lower fitting is provided with a tilt suppression piece corresponding to the abutment locking piece, This is a fixing bracket for flooring, characterized in that the abutment engagement piece abuts and engages with the tilt suppression piece, thereby suppressing tilt of the lower fitting relative to the upper fitting due to over-tightening of the bolt.

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