Deck plate fixing device and deck plate fixing method

Abstract

To provide a deck plate fixation device capable of firmly fixing the deck plate onto a beam with an adhesive without damaging a substrate.SOLUTION: The deck plate fixation device comprises end members 11 provided respectively so that the ends project outward of a substrate 10 at positions of both ends of the substrate of the deck plate, a fixation tool 20 for holding the projecting part of the end member 11 from the substrate 10 on a beam 9 and an adhesive 4 for bonding a metal fitting 3 constituting the fixation tool 20 onto an upper surface of the beam. The fixation tool 20 comprises a horizontal plate part 31 opposite to the upper surface of the beam 9. The lower surface of the horizontal plate part 31 and the upper surface of the beam 9 are bonded with the adhesive 4, so that the end of the deck plate is fixed onto the beam 9.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a deck plate fixing device and a deck plate fixing method for fixing a plurality of deck plates such that the base plates are connected in the width direction and both end portions are placed on parallel beams. [Background technology]

[0002] Conventionally, a method using deck plates has been used to construct the floors of each floor of a steel-framed or reinforced concrete building. In this method, multiple deck plates are laid horizontally on top of beams, reinforcement is applied on top of them, and then concrete is poured onto the deck plates to construct a reinforced concrete floor structure. During the above process, if a horizontal force acts on the deck plate when workers walk or work on it, or if a vertical upward force (hereinafter referred to as "wind-up force") acts on the deck plate due to wind, the deck plate may move from its original position. To prevent this movement, both ends of each deck plate must be fixed to the beam.

[0003] Conventionally, deck plates are fixed to steel beams by welding, in which both ends of the deck plate are placed on flanges of the steel beams, and then each end of the deck plate is spot-welded to the flanges.

[0004] There are various types of deck plates. For example, a deck plate called a "flat deck" has multiple parallel ribs formed on the underside. This type of deck plate uses a relatively thick steel plate for the base plate, and both ends of the deck plate are fixed to the steel beams by spot welding directly between the base plate and the flanges of the steel beams.

[0005] Furthermore, deck plates known as "deck plates with rebar trusses" have end members formed by bending steel bars into an L shape at both ends of the base plate. The end members support the rebar trusses at the ends of the base plate and have a vertical and horizontal section, with the tip of the horizontal section protruding beyond the edge of the base plate onto the steel beam. This protruding section is spot welded to the flange of the steel beam, thereby securing both ends of the deck plate to the steel beam.

[0006] The welding method described above has the problem that the steel beams are weakened by heat due to their alteration. Furthermore, when welding is performed at high altitudes, sparks from the welding process may fall and cause burns to workers below, ignite combustible materials, or cause sparks to fall onto neighboring houses or public roads, potentially causing fires or accidents to third parties.

[0007] In order to solve the above problems, methods have been proposed in which adhesives or screw-type fasteners are used instead of welding to fasten deck plates to beams (see, for example, Patent Documents 1 and 2).

[0008] Patent Document 1 shows a method of fixing a flat deck to a steel beam with adhesive. The flat deck has anchoring sections formed on the underside of both ends of the base plate for placing it on the beam by crushing the ends of the reinforcing ribs. When fixing the flat deck to the steel beam with adhesive, the adhesive is interposed between the anchoring sections and the upper surface of the steel beam to adhesively fix the flat deck to the steel beam.

[0009] Patent Document 2 shows a method of fixing a deck plate to a steel beam using a screw-type fastener. For example, when fixing a deck plate with a reinforcing bar truss to a steel beam using a screw-type fastener, the deck plate is fixed to the steel beam by placing the end of the deck plate on the flange of the steel beam and clamping the end of the base plate of the deck plate and the flange of the steel beam between the lower end of the screw shaft of the fastener and the hook part of the hook. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Utility Model Application Publication No. 5-3422 [Patent Document 2] Japanese Unexamined Patent Publication No. 62-148750 Summary of the Invention [Problem to be solved by the invention]

[0011] To implement the adhesive fixing method described in Patent Document 1, adhesive is applied to the fixing positions of each deck plate on the top surface of the steel beam, and then multiple deck plates are laid on the steel beam, requiring workers to use the steel beam as a foothold to carry out the application work.In addition, when laying the deck plates, workers must walk on the steel beam, avoiding the areas where adhesive has been applied, which not only reduces work efficiency but also makes the work dangerous.

[0012] Furthermore, when the flat deck's anchoring section is bonded to the steel beam with adhesive, the anchoring section is formed by crushing the reinforcing ribs, resulting in an uneven surface and the anchoring section not adhering to the top surface of the steel beam flange. As a result, the bond strength between the anchoring section and the steel beam is insufficient, and when subjected to wind-induced upward force, the tensile force acting on the adhesive surface could cause the anchoring section to separate from the steel beam.

[0013] When the fastening method using the fastener described in Patent Document 2 is applied to a deck plate with reinforcing bar trusses, and a thin hot-dip galvanized steel plate with a wall thickness of 1 mm or less is used as the base plate, there is a risk that the base plate will be damaged by being strongly pressed against it by the lower end of the screw shaft, causing holes or scratches. If a load is applied to the damaged base plate, the base plate will break at the location of the scratch, causing problems with the deck plate being able to be fastened to the steel beam.

[0014] This invention was made in response to the above-mentioned problems, and aims to provide a deck plate fixing device that can firmly fix a deck plate to a beam with adhesive without damaging the base plate, and a deck plate fixing method that can efficiently and safely perform the deck plate fixing work. [Means for solving the problem]

[0015] The deck plate fixing device of this invention is used to fix a plurality of deck plates by placing both ends on parallel beams so that the base plates are connected in the width direction, and includes at least one end member provided at each end position of the base plate so that the end protrudes outward from the base plate, a fixing member for holding the part of the end member protruding beyond the base plate on the beam, and adhesive for joining the fixing member to the upper surface of the beam. The fixture has a horizontal plate portion that faces the upper surface of the beam, and the end of the deck plate is fixed onto the beam by bonding the lower surface of the horizontal plate portion to the upper surface of the beam with an adhesive.

[0016] To secure a deck plate to a beam using the above-described deck plate securing device, multiple deck plates are arranged with their base plates connected widthwise, and both ends of each base plate are placed on parallel beams. Then, for each deck plate, the portion of the end member protruding from the base plate is held on the beam by a retainer, and adhesive is interposed between the underside of the horizontal plate and the upper surface of the beam, and the retainer is bonded and secured to the upper surface of the beam. Because the portion of each end member protruding from the base plate is held on the beam by the retainer and the horizontal plate of the retainer is bonded to the upper surface of the beam with adhesive in close contact, the end member is firmly secured to the beam, and both ends of each deck plate are firmly secured to the beam. Therefore, even if a horizontal force acts on the deck plate when workers walk or work on it, or if wind blows up the deck plate and these forces act as tensile forces on the bonded portion, there is no risk of the bonded portion being severed, and there is no risk of the deck plate moving from its original position.

[0017] The deck plate is, for example, a deck plate with a rebar truss having at least one rebar truss with end members attached to both end positions, and the end members have vertical and horizontal portions formed by bending steel bars into an L shape, and the vertical portions are spot welded to the upper and lower end bars of the rebar truss so that the horizontal portions protrude outward from the base plate. The deck plate is not limited to a deck plate with a reinforcing bar truss, but may be a flat deck with multiple parallel ribs formed on the underside.

[0018] The beam is, for example, a steel beam, and preferably, an adhesive-applied surface is formed on the upper surface of the steel beam around the portion where the end member of the deck plate protrudes from the base plate, with the oxide film covering the surface of the steel beam removed.

[0019] Here, "the vicinity" refers not only to the vicinity of the end member but also to a relatively broad area including the vicinity of the end member. When removing the oxide film using a predetermined tool, it is desirable to remove the oxide film at a position some distance away from the end member so that the tool does not come into contact with the end member and interfere with the use of the tool.

[0020] If the horizontal plate portion of the fastener were bonded to the top surface of the steel beam without removing the oxide film from the surface, there is a risk that the fastener would fall off from the top surface of the steel beam when wind-induced upward force acts on the deck plate due to peeling of the oxide film. However, according to this embodiment, the oxide film on the surface of the steel beam is removed and an adhesive-applied surface is formed on the top surface of the steel beam, so there is no problem of the oxide film peeling off and the fastener falling off. The bonding strength between the horizontal plate portion of the fastener and the top surface of the steel beam is significantly increased by removing the oxide film, so even if wind-induced upward force acts as a tensile force on the bonded portion between the horizontal plate portion of the fastener and the steel beam, the bonded portion will not easily break.

[0021] Although various types of fasteners are conceivable, a preferred embodiment of the fastener is a metal fitting for fastening one end member, and the metal fitting is fitted onto the outer periphery of the end member. FittingThe fitting is preferably formed by bending a single plate material, and the fitting includes a curved plate portion into which the outer peripheral surface of the end member fits, extending from the top surface to both side surfaces, and parallel vertical plate portions hanging down from both ends of the curved plate portion, with horizontal plate portions continuing from the lower end of each vertical plate portion at right angles to the vertical plate portions.

[0022] According to this embodiment, the portion of the end member that protrudes from the base plate is a metal fitting. Fitting It fits into the joint and is held on the beam. Fitting Since the horizontal plate portion is continuous with the vertical plate portion at a right angle to the joint, the distance between the end member and the horizontal plate portion is short, and when an upward force acts on the end member, the moment acting on the horizontal plate portion is small, the horizontal plate portion is less likely to bend, and the adhesive portion does not easily peel off. The metal fitting does not necessarily have to be made from a single plate material, but may be made by integrally joining a plurality of members, for example, a metal pipe and a metal plate, to form the fitting portion and the horizontal plate portion.

[0023] In a further preferred embodiment, the metal fitting has a rib formed integrally on the upper surface of the horizontal plate portion in a direction perpendicular to the longitudinal direction of the fitting portion.

[0024] According to this embodiment, when an upward force due to wind acts on the deck plate, the ribs suppress bending of the horizontal plate portion, preventing the horizontal plate portion from being turned up.

[0025] The rib may extend not only to the upper surface of the horizontal plate portion but also to the upper surface of the fitting portion.

[0026] In another preferred embodiment, the fastener comprises a metal fitting for fastening at least two end members, and the metal fitting has a plurality of fittings into which the outer peripheral surfaces of the end members are fitted, respectively. Fitting Adjacent with a joint Fitting A horizontal plate portion is provided between the mating portions. The metal fitting is preferably formed from a hollow pipe, and each mating portion is formed by cutting out at least two locations on the outer surface of the pipe to correspond to the outer shape of the end member.

[0027] According to this embodiment, the portions of the at least two end members protruding from the base plate of the metal fitting are Fitting The beams are held in place by fitting into the joints. Fitting Since the bottom surface of the horizontal plate between the joints and the top surface of the beam can be joined with adhesive, the oxide film can be removed from the surface of the beam at a position away from the end member. This prevents the end member from interfering with the use of the tool, such as by touching the tool, and makes it easy to form a surface to apply adhesive. In addition, by cutting out the outer surface of the hollow pipe, Fitting Because a joint is formed, the pipe is not easily deformed by an upward force acting on the end member, bending of the horizontal plate is suppressed, and the adhesive part does not easily peel off. Note that the metal fitting does not necessarily have to be made using a hollow pipe; for example, it can be made by bending a single plate material.

[0028] Another preferred embodiment of the fixture includes a pressing member formed by connecting a plurality of steel bars, and a metal fitting for holding the pressing member on the beam. The pressing member includes a first steel bar pressed onto at least two end members, and a second steel bar whose end is connected to the underside of the first steel bar perpendicular to the first steel bar. The metal fitting is a metal fitting into which the outer circumferential surface of the second steel bar fits. Fitting It has a joint and a horizontal plate portion integrated into one piece.

[0029] According to this embodiment, the first steel bar of the pressing member is pressed onto at least two end members. The second steel bar protrudes onto the beam, and the metal fitting is attached thereon. Fitting The joint is fitted, and the pressing member is held on the beam. The underside of the horizontal plate portion of the metal fitting and the top surface of the beam are fixed with adhesive, and the second steel bar is held by the metal fitting, so the oxide film can be removed from the surface of the beam at a position away from the end member. This prevents the end member from interfering with the use of a tool, such as by touching the tool, and makes it easy to form a surface to apply adhesive. Furthermore, the first and second steel bars of the pressing member are not easily deformed by an upward force acting on the end member, preventing the horizontal plate portion of the metal fitting from bending and preventing the adhesive from peeling off.

[0030] In another preferred embodiment, the pressing member has a pair of first steel bars pressed against at least two end members provided on a first base plate and at least two end members provided on a second base plate aligned longitudinally with the first base plate and the beam in between, and both ends of a second steel bar are connected to the underside of each first steel bar.

[0031] According to this embodiment, one pressing member can hold at least two end members provided on a first substrate and at least two end members provided on a second substrate that are aligned longitudinally with the first substrate and the beam in between, on the beam.

[0032] In a preferred embodiment, the metal fitting is formed by bending a single sheet of plate material, and the fitting portion includes a curved plate portion into which the outer peripheral surface of the second steel bar fits from the top surface to both side surfaces, and parallel vertical plate portions hanging down from both ends of the curved plate portion, with horizontal plate portions continuing at the lower end of each vertical plate portion at right angles to the vertical plate portion.

[0033] According to this embodiment, the second steel bar is Fitting It fits into the joint and is held on the beam. Fitting Since the horizontal plate portion is continuous with the vertical plate portion at a right angle to the joint, the distance between the end member and the horizontal plate portion is short, and when an upward force acts on the second steel bar, the moment acting on the horizontal plate portion is small, the horizontal plate portion is less likely to bend, and the adhesive portion does not easily peel off.

[0034] The method for fixing deck plates according to this invention is for placing and fixing a plurality of deck plates, with their base plates connected in the width direction, on parallel steel beams at both ends, and includes the steps of: preparing a plurality of deck plates, each having at least one end member disposed at both ends of the base plate so that the end protrudes outward from the base plate; and preparing fixtures having horizontal plate portions facing the upper surfaces of the beams and for holding the portions of the end members protruding beyond the base plate on the beams; carrying the deck plates and fixtures up to a floor construction floor of the building and placing the plurality of deck plates, with their base plates connected in the width direction, on the parallel steel beams at both ends; forming adhesive-applied surfaces on the upper surfaces of the steel beams around the portions of the end members of each deck plate protruding beyond the base plate, from which the oxide film covering the surface of the steel beams has been removed; and, with the portions of the end members of each deck plate protruding beyond the base plate held on the beams by the fixtures, fixing both ends of each deck plate to the beams by adhesively joining the underside of the horizontal plate portion of the fixture to the adhesive-applied surface on the upper surface of the steel beam.

[0035] According to the above-mentioned method for fastening deck plates, the adhesive is applied after the deck plate has been laid on the steel beams, allowing for walking and work using the deck plate as a foothold, enabling efficient and safe work. Furthermore, when multiple deck plates are fixed together with their base plates connected widthwise and both ends placed on parallel steel beams, the adhesive-applied surfaces of the steel beams have been formed by removing the oxide film, significantly increasing the bond strength between the horizontal plate portions of the fasteners and the top surfaces of the steel beams. Even when wind blows upward, the bond between the horizontal plate portions of the fasteners and the steel beams is not easily severed, and the deck plate is firmly fixed to the beams with the adhesive. [Effects of the Invention]

[0036] According to this invention, regardless of the type of deck plate, the deck plate can be firmly fixed to the beam with adhesive without damaging the base plate. Also, the work of fixing the deck plate can be carried out efficiently and safely. [Brief explanation of the drawings]

[0037] [Figure 1] FIG. 10 is a plan view showing a state in which multiple deck plates are fixed onto a beam by a deck plate fixing device. [Figure 2] FIG. 10 is a side view showing the state in which the end member of the deck plate is fixed onto the beam. [Figure 3] FIG. 1 is a perspective view illustrating one embodiment of a fixture. [Figure 4] FIG. 4 is a side view showing a state in which an end member of a deck plate is fixed onto a beam by the fixing device of FIG. 3. [Figure 5] FIG. 5 is a cross-sectional view taken along line AA in FIG. [Figure 6] 4 is a perspective view showing another embodiment of the fixture of FIG. 3. FIG. [Figure 7] 4 is a perspective view showing yet another embodiment of the fixture of FIG. 3. FIG. [Figure 8] FIG. 10 is a perspective view showing the process of fixing the end member of the deck plate onto the beam. [Figure 9] FIG. 10 is a perspective view showing another embodiment of the deck plate fixing device. [Figure 10] FIG. 10 is an enlarged plan view showing a state in which a plurality of deck plates are fixed onto a beam by a deck plate fixing device of another embodiment. [Figure 11] FIG. 10 is a perspective view showing another embodiment of the fixture. [Figure 12] FIG. 12 is a cross-sectional view taken along line BB in FIG. [Figure 13] FIG. 12 is a cross-sectional view taken along line CC in FIG. [Figure 14] FIG. 10 is an enlarged plan view showing a state in which a plurality of deck plates are fixed onto a beam by a deck plate fixing device of yet another embodiment. [Figure 15] FIG. 10 is a perspective view showing another embodiment of the fixture. [Figure 16] FIG. 10 is a cross-sectional view showing yet another embodiment of the fixing device. [Figure 17] FIG. 10 is a perspective view showing another embodiment of the deck plate fixing device. [Figure 18]FIG. 18 is a plan view of the embodiment of FIG. 17. [Figure 19] FIG. 18 is a front view of the embodiment of FIG. 17. [Figure 20] FIG. 10 is a plan view showing another embodiment of the fixture. [Figure 21] FIG. 10 is a perspective view showing yet another embodiment of the fixture. DETAILED DESCRIPTION OF THE INVENTION

[0038] Figure 1 shows a state in which multiple deck plates 1 have been laid on a floor construction floor of a building, with the base plates 10 connected in the width direction. In the figure, 91 is a main beam and 92 is a secondary beam, which will be collectively referred to as beam 9 in the following explanation. Beam 9 is a steel beam having flange 90, but is not limited to steel beams; the present invention can also be applied to, for example, precast beams.

[0039] As shown in Figure 2, each deck plate 1 is placed on flanges 90 of parallel beams 9, 9 at both ends, and is fixed onto the beams 9 by a plurality of deck plate fixing devices 2 according to the present invention. The length of the deck plate 1 over the beams 9 is approximately 30 mm.

[0040] The deck plate 1 shown in Figure 2 is a deck plate with reinforcing bar trusses, and comprises a base plate 10 made of hot-dip galvanized steel plate and a plurality of reinforcing bar trusses 12 arranged side by side on the base plate 10 at regular intervals (for example, 150 mm intervals). In the following description, the direction in which the reinforcing bar trusses 12 extend is referred to as the "lengthwise direction," and the direction perpendicular to the lengthwise direction is referred to as the "widthwise direction." In Figure 1 and Figures 10 and 14 described below, the reinforcing bar trusses 12 of each deck plate 1 are shown by two-dot chain lines, and three or four rows of reinforcing bar trusses 12 are provided on the base plate 10.

[0041] The substrate 10 used has a thickness of 0.4 mm, a width of 600 mm, and a length of 600 to 7000 mm, for example. A plurality of hanging members 16 are arranged in parallel at predetermined intervals along the length direction on the substrate 10. The upper end bars 13 of each reinforcing bar truss 12 are fixed to the top of each hanging member 16 by spot welding, thereby suspending each reinforcing bar truss 12 above the substrate 10.

[0042] The reinforcing bar truss 12 includes straight upper end bars 13, straight lower end bars 14 arranged parallel to the upper end bars 13, and wavy lattice bars 15 provided between the upper end bars 13 and the lower end bars 14, and is supported by a plurality of hanging members 16 in a direction perpendicular to the hanging members 16, i.e., in the longitudinal direction. An L-shaped end member 11 is provided at each end of the base plate 10 for each rebar truss 12. In addition, although not shown, joints for connecting to adjacent deck plates are integrally formed on both side edges of the base plate 10.

[0043] The end member 11 supports the reinforcing bar truss 12 at the end position of the base plate 10, and is formed by bending a steel bar with a circular cross section at a right angle (L-shape). The vertical portion 11a of the end member 11 is spot welded to the upper end reinforcement 13 and lower end reinforcement 14 of the reinforcing bar truss 12. The horizontal portion 11b extends in the lengthwise direction while nearly in contact with the upper surface of the base plate 10, and protrudes above the flange 90 of the beam 9 from the end edge of the base plate 10. The end of the base plate 10 is placed on the flange 90 of the beam 9 and fixed onto the flange 90 by the deck plate fixing device 2 according to the present invention.

[0044] The deck plate 1 with reinforcing bar trusses in the illustrated example has end members 11 pre-installed on both ends of each reinforcing bar truss 12 as a configuration for welding and fixing to the flanges 90 of the beams 9, but if the deck plate does not have pre-installed end members 11, the end members 11 may be added later. The added end members 11 do not necessarily have to be L-shaped, and may have any shape, such as a straight shape, as in the embodiment shown in Figure 9 described below.

[0045] Of the three reinforcing bar trusses 12, the end members 11 of the reinforcing bar trusses 12 on both sides, together with a fixing device 20 and an adhesive 4, each constitute a deck plate fixing device 2. The fixing device 20 is used to hold the portion of the end member 11 protruding from the base plate 10 on the beam 9, and in this embodiment is made up of a metal fitting 3 that fixes one of the end members 11. The adhesive 4 is used to join and fix the metal fitting 3 to the top surface of the flange 90 of the beam 9. The deck plate fixing device 2 may be provided at each position of the end members 11 of all three reinforcing bar trusses 12, or may be provided only at the position of the end member 11 of the reinforcing bar truss 12 in the central position.

[0046] 3 shows one embodiment of the metal fitting 3 constituting the fixture 20. The metal fitting 3 is installed so as to cover the horizontal portion 11b of the end member 11. The metal fitting 3 in the illustrated example is formed by bending a single strip of hot-dip galvanized steel sheet, and is integrally provided with a fitting portion 30 into which the outer peripheral surface of the end member 11 fits, and left and right horizontal plate portions 31, 31 that face the upper surface of the flange 90 of the beam 9. In this example, the strip of metal fitting 3 has a thickness of approximately 1.6 mm, but the thickness is not limited to this.

[0047] The fitting portion 30 includes a semi-cylindrical curved plate portion 32 and left and right vertical plate portions 33, 33 that hang down from both ends of the curved plate portion 32 and extend parallel to each other. The lower ends of the vertical plate portions 33 are continuous with the left and right horizontal plate portions 31 at right angles. The inner diameter of the curved plate portion 32 is set so that the outer peripheral surface of the end member 11, from the top surface to both side surfaces, fits into the curved plate portion 32 in a state where the outer peripheral surface of the end member 11, from both side surfaces to the bottom surface, is positioned within the space sandwiched between the left and right vertical plate portions 33, 33.

[0048] According to this embodiment, the horizontal distance between the horizontal portion 11b of the end member 11 and the left and right horizontal plate portions 31 is minimized, and the moment acting on the horizontal plate portions 31 in response to an upward force acting on the end member 11 is small, making the horizontal plate portions 31 less likely to bend. The curved plate portion 32 can be set to have a larger inner diameter so that a gap is created between it and the outer peripheral surface of the end member 11, but in this case it is desirable to fill the gap with an adhesive, which will be described later.

[0049] In this embodiment, the end member 11 has a diameter R of 15 mm. The metal fitting 3 has a width w of 25 mm, a length L of 55 mm, an inner diameter r of the curved plate portion 32 of 15 mm, a length d of the horizontal plate portion 31 of 20 mm, and a height h of the vertical plate portion 33 of 7.5 mm.

[0050] As shown in Figures 4 and 5, the lower surface of each horizontal plate portion 31 is flat and forms an adhesive application surface 34. On the other hand, adhesive application surfaces 93a, 93b are formed on the upper surface of the beam 9 near the portion where the end member 11 protrudes from the substrate 10. The adhesive application surfaces 93a, 93b on the beam 9 side are formed by removing the oxide film covering the surface of the beam 9, and face the adhesive application surfaces 34 of each horizontal plate portion 31. The planar shape of the adhesive application surfaces 93a, 93b may be circular or rectangular, but it is desirable to form them in a size that includes the entire adhesive application surface 34 of each horizontal plate portion 31.

[0051] The oxide film, also known as "black scale" or "mill scale," forms on the surface of steel plates during hot processing. Because this oxide film is produced by reacting with oxygen in the air, it only appears on the surface of the steel plate and does not penetrate into the interior. The oxide film was removed to form adhesive application surfaces 93a, 93b because, if the oxide film were not removed and adhesive were applied to the oxide film surface to join the horizontal plate portion 31 to the surface of the beam 9, the oxide film could peel off when wind blows up the base plate 10 of the deck plate 1, resulting in insufficient bond strength between the top surface of the beam 9 and the horizontal plate portion 31 of the metal fitting 3.

[0052] The oxide film can be removed by carrying out a physical surface treatment method such as blasting, grinding, or cutting, and is typically carried out using a predetermined dedicated tool suitable for each treatment. However, the surface treatment method is not limited to physical surface treatment methods; the oxide film can also be removed by chemical surface treatment methods such as dissolution by pickling, and the surface treatment method is not limited.

[0053] The adhesive 4 is applied to both the application surface 34 of each horizontal plate portion 31 and the application surfaces 93a, 93b of the beam 9, and the metal fitting 3 and the upper surface of the beam 9 are joined with the adhesive 4, thereby fixing the portion of the end member 11 protruding from the base plate 10 onto the beam 9. In this case, it is desirable to set the amount of adhesive to be applied so that the thickness of the adhesive is 0.1 to 1 mm. Note that the adhesive application surface 34 of the horizontal plate portion 31 does not necessarily have to be flat, and may, for example, be provided with a number of parallel grooves or formed into a matte finish.

[0054] In this embodiment, a two-component acrylic adhesive (for example, "Cemedine Y620" (trade name)) is used as the adhesive 4, but the adhesive is not limited to this and various adhesives can be used as long as they can strongly bond metal to metal and have excellent tensile strength. In addition, considering workability, the hardening time of the adhesive is preferably about several hours, and even more preferably within one hour.

[0055] 6(A) and (B) show that a rib 5 of a predetermined height is integrally formed on the upper surface of each horizontal plate portion 31 in a direction (direction indicated by y in the figure) perpendicular to the longitudinal direction of the fitting 30 (direction indicated by x in the figure), i.e., in the longitudinal direction of the metal fitting 3. 6(A), one rib 5 is provided at the middle position in the width direction x of the horizontal plate portion 31. The rib 5 extends over the entire length of the left and right horizontal plate portions 31 and around the entire periphery of the upper surface of the fitting portion 30. 6(B), two ribs 5, 5 are provided at both ends in the width direction x of the left and right horizontal plate portions 31. Each rib 5 extends over the entire length of each horizontal plate portion 31, reaching as far as a position just before the fitting portion 30.

[0056] In this embodiment, the presence of the ribs 5 reinforces the strength of each horizontal plate portion 31 in a direction perpendicular to the ribs 5, so that when a wind-induced blowing force F acts on the base plate 10 of the deck plate 1, the ribs 5 suppress the deflection of the left and right horizontal plate portions 31, preventing each horizontal plate portion 31 from lifting up from the inner end side and peeling off from the coated surfaces 93a, 93b of the beam 9.

[0057] The above-described fitting 3 is formed by bending a single strip of plate material to form the fitting portion 30 and the left and right horizontal plate portions 31 as a single unit, but it can also be formed by joining a rectangular metal pipe and a flat metal plate together by welding or adhesive, as shown in Figure 7. The fitting 3 shown in Figure 7 is integrally provided with the fitting portion 30 into which the outer peripheral surface of the end member 11 fits almost tightly, and the horizontal plate portion 31 that faces the upper surface of the flange 90 of the beam 9.

[0058] Next, a construction method for constructing a floor of a building using a plurality of deck plates 1 and a method for fixing both ends of the deck plate 1 onto parallel beams 9 using the deck plate fixing device 2 of the above-described embodiment will be described. First, multiple deck plates 1 and the required number of fittings 3 (four per deck plate 1 in this example) are fabricated and prepared in a factory, and then transported to the construction site. The deck plate 1 here is a deck plate with rebar trusses, with end members 11 pre-welded to both end positions. In addition, the metal fittings 3 constitute the fixing device 20 of the deck plate fixing device 2, and the deck plate fixing device 2 includes an end member 11, a metal fitting 3 as the fixing device 20 which integrally comprises an engaging portion 30 into which the outer peripheral surface of the end member 11 fits and a horizontal plate portion 31 which faces the upper surface of the beam 9, and an adhesive 4 for joining the horizontal plate portion 31 of the metal fitting 3 to the upper surface of the beam 9.

[0059] Next, at the construction site, the required number of deck plates 1 and the required number of metal fittings 3 and adhesive 4 are carried up to the floor construction level of the building, and then the required number of deck plates 1 are first laid down with the base plates 10 connected in the width direction and both ends placed on parallel beams 9. Workers can walk on the laid deck plates 1 as footholds and perform subsequent work of fixing the deck plates 1 on the deck plates 1 efficiently and safely.

[0060] In the next step, workers fix both ends of each deck plate 1 onto each beam 9 using deck plate fixing devices 2. First, as shown in Figure 8, on the upper surface of the beam 9, near the portion where the end member 11 of the deck plate 1 protrudes from the base plate 10, the oxide film covering the surface of the beam 9 is removed by a physical or chemical surface treatment method to form adhesive application surfaces 93a, 93b.

[0061] In the next step, fitting portion 30 of metal fitting 3 is fitted into end member 11 of deck plate 1, and adhesive 4 is applied to adhesive-coated surfaces 34 on the undersides of left and right horizontal plate portions 31 and to adhesive-coated surfaces 93a, 93b on the top surface of beam 9, filling the gap between horizontal plate portions 31 and beam 9 with adhesive 4, and joining metal fitting 3 to the top surface of beam 9. As a result, end member 11 is held on beam 9 by fitting portion 30 of metal fitting 3, and horizontal plate portion 31 integrated with fitting portion 30 is joined to the top surface of beam 9 by adhesive 4, so that the portion of end member 11 protruding from base plate 10 is fixed onto beam 9, and the end of deck plate 1 is firmly fixed onto beam 9. In particular, the adhesive application surfaces 93a and 93b on the upper surface of the beam 9 are formed by removing the oxide film from the surface of the beam 9, so the bonding strength between the horizontal plate portion 31 of the metal fitting 3 and the beam 9 is strong, and even if a tensile force is applied to the bonded portion, there is no risk of the bonded portion being severed, and the end The member 11 is firmly fixed on the beam 9.

[0062] By performing the above-mentioned fixing work at the positions of the designated end members 11 of all deck plates 1 and fixing each deck plate 1 onto the parallel beams 9, 9, even if a worker walks or works on the deck plate 1 and horizontal forces act on the deck plate 1, or if wind blows up the deck plate 1 and these forces act as tensile forces on the bonded parts, there is no risk of the bonded parts being severed, and there is no risk of the deck plate 1 moving from its original position.

[0063] In particular, since the left and right vertical plate portions 33 of the metal fitting 3 are perpendicular to the horizontal plate portion 31, when a vertical blowing force is transmitted to the metal fitting 3 via the end member 11 and acts as a force to lift the vertical plate portion 33, the force acts vertically on the inner end of the horizontal plate portion 31. When an upward tensile force acts on the hardened adhesive 4 between the horizontal plate portion 31 and the beam 9, the inner end portion of the horizontal plate portion 31 strongly resists the tensile force and prevents the adhesive portion from being severed. Therefore, the horizontal plate portion 31 does not easily peel off from the top surface of the beam 9.

[0064] The deck plate fixing device 2 described above is used to fix a deck plate 1 with rebar trusses, which has end members 11 attached beforehand, to a beam 9. However, for deck plates such as flat decks that do not have end members attached beforehand, as shown in Figure 9, a predetermined number of linear end members 11 are attached in parallel to the ends of the base plate 10 of the deck plate 1 by spot welding or the like so that the ends protrude outward from the base plate 10. The parts of the end members 11 protruding beyond the base plate 10 are held in place by metal fittings 3 serving as fixing devices 20, and the metal fittings 3 are bonded and fixed to the top surface of the beam 9 with adhesive 4.

[0065] The deck plate fixing device 2 of the above-described embodiment uses a metal fitting 3 that fixes one end member 11 by itself as the fixing device 20, but the fixing device 20 is not limited to such a configuration. A fixture 20 of a second embodiment shown in Figures 10 to 16 uses a metal fitting 6 that individually fastens at least two end members 11. A fixture 20 of a third embodiment shown in Figures 17 to 21 uses a metal fitting 8 that fastens at least two end members 11 via a pressing member 7.

[0066] In Figure 10, multiple deck plates 1 with reinforcing bar trusses are placed on flanges 90 of beams 9, 9 whose ends are parallel to each other, and are fixed to the beams 9 by multiple deck plate fixing devices 2. The configuration of the deck plate 1 with reinforcing bar trusses is the same as that of the embodiment shown in Figure 2, so a detailed description will be omitted here. As shown in Figures 11 to 13, each deck plate fixing device 2 holds two end members 11 attached to the reinforcing bar trusses of adjacent deck plates 1, 1 with a fixing device 20 consisting of a single metal fitting 6 and fixes them with adhesive 4.

[0067] The metal fitting 6 in the illustrated example has a rectangular cylindrical body 65 and two left and right fittings that fit onto the outer peripheral surfaces of the end members 11. Fitting The joints 60, 60 are provided at a distance corresponding to the distance between the two end members 11. The main body 65 is made up of a front plate 65a, a rear plate 65b, an upper plate 65c, and a lower plate 65d, and the upper plate 65c has a rectangular opening 66 formed therein to allow poured concrete to flow into the main body 65. The lower plate 65d of the main body 65 faces the upper surface of the beam 9 when the metal fitting 6 is fixed, Fitting The lower plate portion 65d between the joints 60, 60 constitutes the horizontal plate portion 61, and the deck plate 1 is fixed to the beam 9 by joining the lower surface of the horizontal plate portion 61 and the upper surface of the beam 9 with adhesive 4.

[0068] The flat lower surface of the horizontal plate portion 61 forms an adhesive application surface 64. Meanwhile, an adhesive application surface 93 is formed on the upper surface of the beam 9 around the end member 11 protruding from the end of the substrate 10, at a position slightly away from the end member 11 where the use of tools is not hindered. The adhesive application surface 93 on the beam 9 side is formed by removing the oxide film covering the surface of the beam 9, and faces the adhesive application surface 64 of each horizontal plate portion 61. The shape of the adhesive application surface 93 on the beam 9 side may be circular or rectangular.

[0069] In this embodiment, two portions of the outer circumferential surface of the hollow pipe are cut out to correspond to the outer shape of the end member 11, so that two portions are formed in the main body 65. FittingThe joints 60, 60 form a horizontal plate portion 61. The pipe is a square pipe made of hot-dip galvanized steel plate, and the cross section in the direction perpendicular to the length direction is square. The main body portion 65 has a side of 30 mm and a length of 100 to 250 mm. The main body portion 65 is fitted with the outer peripheral surface of the end member 11. Fitting If it is possible to form the joint 60, the joint 60 may be formed using a pipe whose cross section is rectangular, triangular, pentagonal, circular, or the like.

[0070] Fitting The joint 60 is formed by cutting out the front plate 65a and the rear plate 65b of the main body 65 in the same shape. Fitting The opening edge 69 is formed by cutting out the lower plate 65c. Fitting The joining edges 67 and 68 and the opening edge 69 are continuous. Fitting The mating edges 67, 68 include a semicircular curved portion 62 and left and right vertical portions 63, 63 that hang down from both ends of the curved portion 62 and extend parallel to each other. The curved portion 62 has an inner diameter set so that the outer peripheral surfaces of the end member 11 from the top surface to both side surfaces fit together in a nearly tight fit. The outer peripheral surfaces of the end member 11 from both side surfaces to the bottom surface are Fitting It is located in the space sandwiched between the mating edges 67 and 68 . In addition, Fitting The number of joints 60 is not limited to two, but may be an even number equal to or greater than two. Fitting The shape of the joint portion 60 is not limited to the above, and may be rectangular when viewed from the front.

[0071] In the above embodiment, two end members 11 of adjacent deck plates 1, 1 are held and fixed by a fastener 20 consisting of a single metal fitting 6, but as in the embodiment shown in Figure 14, multiple end members 11 (2 to 4, four in the illustrated example) for each deck plate 1 may be held and fixed by a fastener 20 consisting of a single metal fitting 6.

[0072] As shown in FIG. 15, the metal fitting 6 of this embodiment has a rectangular cylindrical body 65 and a total of four end members 11. FittingThe joints 60 are provided at intervals corresponding to the intervals between the end members 11. The main body 65 is made up of a front plate 65a, a rear plate 65b, an upper plate 65c, and a lower plate 65d. The upper plate 65c has two rectangular openings 66 formed therein to allow poured concrete to flow into the main body 65. The lower plate 65d of the main body 65 faces the upper surface of the beam 9 when the metal fitting 6 is fixed, Fitting The lower plate portion 65d between the joints 60, 60 constitutes the horizontal plate portion 61, and the deck plate 1 is fixed to the beam 9 by joining the lower surface of the horizontal plate portion 61 and the upper surface of the beam 9 with adhesive 4. In addition, Fitting The configurations of the joint portion 60 and the horizontal plate portion 61 are the same as those in the embodiment of FIGS. 11 to 13, and the corresponding components are denoted by the same reference numerals and the description thereof will be omitted.

[0073] According to each of the above-mentioned embodiments, the portions of at least two end members 11 protruding from the base plate 10 are made of a plurality of metal fittings 6. Fitting The adjacent pieces are fitted and held in place in the joint 60. Fitting The lower surface of the horizontal plate portion 61 between the joints 60, 60 and the upper surface of the beam 9 are joined with adhesive 4, and an oxide film is removed from the surface of the beam 9 using a tool at a position slightly away from the end member 11 to form a coating surface 93 for the adhesive 4. This prevents the end member 11 from interfering with the use of the tool, such as by touching the tool, and makes it easy to form the coating surface 93 for the adhesive 4. In addition, the outer periphery of the hollow pipe is notched, Fitting Since the joint 60 is formed, the pipe is unlikely to be easily deformed by an upward force acting on the end member 11, bending of the horizontal plate portion 61 is suppressed, and the bonded portion does not easily peel off.

[0074] In the above embodiment, the outer circumferential surface of the hollow pipe is cut out to form a plurality of Fitting The joint portion 60 and the horizontal plate portion 61 are formed, but as in the embodiment shown in FIG. 16, one strip plate material is bent to form at least two Fitting A mating portion 60 and a horizontal plate portion 61 can also be formed. This embodiment has two mating portions 60, 60 that fit into the outer peripheral surfaces of the two end members 11, Fitting A horizontal plate portion 61 facing the upper surface of the beam 9 is integrally provided between the joints 60, 60. Reinforcing ribs 5 are formed on both ends of the upper surface of the horizontal plate portion 61 in the width direction. Each rib 5 extends over the entire length of the horizontal plate portion 61. Fitting The structure of the joint 60 is the same as that of the embodiment shown in FIG. Fitting This is similar to the joint 30, and the explanation will be omitted here.

[0075] 17 to 21 show a third embodiment of the deck plate fixing device 2. A fixing tool 20 of this embodiment has one pressing member 7 for fixing a plurality of end members 11, and at least one metal fitting 8 for holding and fixing the pressing member 7 on a beam 9.

[0076] In the embodiment shown in Figures 17 to 19, the pressing member 7 is formed by connecting two straight steel bars, and includes a first steel bar 71 that is pressed onto two adjacent end members 11, and a second steel bar 72 that has one end connected to the underside of the first steel bar 71 at the center of its length, perpendicular to the first steel bar 71. The first and second steel bars 71, 72 have a circular cross section and the same diameter as the end member 11, and are connected by spot welding. The other end of the second steel bar 72 is an open end, and is held on the beam 9 by a metal fitting 8. The metal fitting 8 fits onto the outer circumferential surface of the second steel bar 72 of the pressing member 7. Fitting It is integrally provided with a joint 80 and a horizontal plate portion 81 that faces the upper surface of the beam 9. In addition, the first steel bar 71 of the pressing member 7 may be pressed onto three or more end members 11, in which case the number of second steel bars 72 connected to the first steel bar 71 and the number of metal fittings 8 are increased depending on the length of the first steel bar 71.

[0077] The metal fitting 8 is formed by bending a single strip of plate material. The fitting portion 80 includes a curved plate portion 82 into which the outer peripheral surface of the second steel bar 72 fits, from the top surface to both side surfaces, and parallel vertical plate portions 83 hanging down from both ends of the curved plate portion 82, with horizontal plate portions 81 continuing from the lower end of each vertical plate portion 83 at right angles to the vertical plate portions 83. The configuration of the metal fitting 8 is the same as that of the metal fitting 3 shown in Figure 3, and therefore a description thereof will be omitted here.

[0078] According to this embodiment, the first steel bar 71 of the pressing member 7 is pressed onto at least two end members 11. The second steel bar 72 protrudes onto the beam 9, and the metal fitting 8 is attached thereon. Fitting The joint 80 is fitted into the pressing member 7, and the pressing member 7 is held on the beam 9. When the lower surface of the horizontal plate portion 81 of the metal fitting 8 is fixed to the upper surface of the beam 9 with the adhesive 4, the free end side of the second steel bar 72 is held by the metal fitting 8, so the oxide film can be removed from the surface of the beam 9 at a position away from the end member 11. This prevents the end member 11 from interfering with the use of a tool, such as by touching the tool, and makes it easy to form the application surface 93 of the adhesive 4. Furthermore, the first and second steel bars 71, 72 of the pressing member 7 are not easily deformed by an upward force acting on the end member 11, which prevents the horizontal plate portion 81 of the metal fitting 8 from bending and prevents the adhesive portion from peeling off.

[0079] 20 shows another embodiment of the deck plate fixing device 2. The pressing member 7 in this embodiment has a pair of first steel bars 71a, 71b that are pressed against two end members 11A, 11A provided on the first base plate 10A and two end members 11B, 11B provided on the second base plate 10B that are aligned in the longitudinal direction with the first base plate 10A and the beam 9 in between, and both ends of a second steel bar 72 are connected to the underside of each of the first steel bars 71a, 71b. The second steel bar 72 has a metal fitting 8 attached to its center. Fitting The joint 80 is fitted and held on the beam 9, and the horizontal plate portion 81 of the metal fitting 8 is bonded and fixed with an adhesive to a coated surface 93 formed by removing the oxide film from the surface of the beam 9.

[0080] According to this embodiment, one pressing member 7 and metal fittings 8 can hold and fix two end members 11A, 11A of the first substrate 10A and two other end members 11B, 11B of the second substrate 10B that are aligned longitudinally between the first substrate 10A and the beam 9 on either side of the beam 9 onto the beam 9.

[0081] 20 is configured such that the pair of first steel bars 71a, 71b of the pressing member 7 is pressed against two end members 11A and two other end members 11B that are aligned in the longitudinal direction with the beam 9 in between, and the second steel bar 72 is held by the metal fittings 8. However, as shown in Fig. 21, it is also possible to configure the pair of first steel bars 71a, 71b of the pressing member 7 to be pressed against three end members 11A and three other end members 11B that are aligned in the longitudinal direction with the beam in between, and to hold and fix the centers of two second steel bars 72a, 72b, both ends of which are connected to the first steel bars 71a, 71b, by the metal fittings 8, respectively. The configuration of each metal fitting 8 is the same as that of the embodiment shown in Fig. 20. [Explanation of symbols]

[0082] 1 deck plate 2 Deck plate fixing device 3,6,8 Metal fittings 4. Adhesive 5. Ribs 7 Pressing member 10, 10A, 10B board 11,11A,11B End member 20 Fixtures 30,60,80 mating part 31,61,81 Horizontal plate part 32,82 curved plate section 33,83 Vertical plate part 71, 71a, 71b First steel bar 72, 72a, 72b Second steel bar 93a, 93b, 93 coating surface

Claims

1. A deck plate fixing device for fixing a plurality of deck plates by placing both ends of each deck plate on parallel beams so that the base plates of each deck plate are connected in the width direction, A deck plate fixing device comprising: at least one end member provided at each end position of the base plate so that the end protrudes outward from the base plate; a fixture for holding the portion of the end member protruding above the beam from the base plate on the beam; and an adhesive for joining the fixture to the upper surface of the beam, wherein the fixture has a horizontal plate portion facing the upper surface of the beam, and the lower surface of the horizontal plate portion and the upper surface of the beam are joined by the adhesive, thereby fixing the end of the deck plate to the beam.

2. 2. The deck plate fastening device according to claim 1, wherein the deck plate is a deck plate with a reinforcing bar truss having at least one reinforcing bar truss with end members attached at both end positions, the end members having vertical and horizontal portions formed by bending a steel bar into an L-shape, the vertical portions being spot-welded to the upper and lower end bars of the reinforcing bar truss so that the horizontal portion protrudes outward from the base plate.

3. The deck plate fastening device according to claim 1, wherein the beam is a steel beam, and an adhesive-applied surface is formed on the upper surface of the steel beam around the portion where the end member of the deck plate protrudes from the base plate, from which the oxide film covering the surface of the steel beam has been removed.

4. 2. The deck plate fixing device according to claim 1, wherein the fixing device is a metal fitting for fixing one end member, and the metal fitting is integrally provided with a fitting portion into which the outer peripheral surface of the end member fits and the horizontal plate portion.

5. 5. The deck plate fastening device according to claim 4, wherein the metal fitting is formed by bending a single plate material, the fitting portion includes a curved plate portion into which the outer peripheral surface extending from the upper surface to both side surfaces of the end member fits, and parallel vertical plate portions hanging down from both ends of the curved plate portion, and the horizontal plate portion is continuous with the lower end of each vertical plate portion at a right angle to the vertical plate portion.

6. 6. The deck plate fixing device according to claim 4, wherein the metal fitting has a rib formed integrally on the upper surface of the horizontal plate portion, the rib extending in a direction perpendicular to the length direction of the fitting portion.

7. The deck plate fixing device according to claim 6, wherein the rib extends to an upper surface of the fitting portion.

8. 2. The deck plate fixing device according to claim 1, wherein the fixing device comprises a metal fitting for fixing at least two end members, the metal fitting having a plurality of fitting portions into which the outer peripheral surfaces of the end members respectively fit, and the horizontal plate portion being located between adjacent fitting portions.

9. 9. The deck plate fixing device according to claim 8, wherein the metal fitting is formed of a hollow pipe, and each of the fitting portions is formed by cutting out at least two locations on the outer surface of the pipe to correspond to the outer shape of the end member.

10. 2. The deck plate fixing device according to claim 1, wherein the fixing device includes a pressing member formed by connecting a plurality of steel bars and a metal fitting for holding the pressing member on the beam, the pressing member including a first steel bar that is pressed onto at least two end members and a second steel bar that is connected at its end to the underside of the first steel bar perpendicular to the first steel bar, and the metal fitting integrally includes a fitting portion into which the outer peripheral surface of the second steel bar fits and the horizontal plate portion.

11. 11. The deck plate fixing device according to claim 10, wherein the pressing member has a pair of first steel bars that are pressed against at least two end members provided on a first base plate and at least two end members provided on a second base plate that are aligned longitudinally with the first base plate and the beam therebetween, and both ends of the second steel bars are connected to the underside of each of the first steel bars.

12. 11. The deck plate fastening device according to claim 10, wherein the metal fitting is formed by bending a single plate material, and the fitting portion includes a curved plate portion into which the outer peripheral surface of the second steel bar extends from the upper surface to both side surfaces thereof fits, and parallel vertical plate portions hanging down from both ends of the curved plate portion, and the horizontal plate portion is continuous with the lower end of each vertical plate portion at a right angle to the vertical plate portion.

13. A method for fixing a plurality of deck plates by placing both ends of each deck plate on parallel steel beams so that the base plates of each deck plate are connected in the width direction, a step of preparing a plurality of deck plates each having at least one end member at both end positions of the base plate so that the end protrudes outward from the base plate, and a fixture having a horizontal plate portion facing the upper surface of the beam for holding the portion of the end member protruding above the beam from the base plate on the beam; a step of carrying the deck plate and the fixing device up to a floor construction floor of the building, and placing the deck plates on steel beams with both ends parallel to each other so that the base plates are connected in the width direction; forming an adhesive application surface on the upper surface of the steel beam around the periphery of the portion where the end member of each deck plate protrudes from the base plate, from which the oxide film covering the surface of the steel beam has been removed; a step of fixing both ends of each deck plate to the beam by adhesively joining the underside of the horizontal plate portion of the fixing device to the adhesive-applied surface of the upper surface of the steel beam while holding the portion of the end member of each deck plate protruding beyond the base plate of the end member on the beam with the fixing device.

Images