JP6943776B2 - Fixing bracket and floor slab fixing structure - Google Patents

Description

The present invention relates to a fixing bracket for fixing a deck slab to an upper portion of a beam having a flat plate portion extending in the horizontal direction.

Generally, when a plate-shaped floor slab such as lightweight aerated concrete is fixed to the upper part of a steel beam formed of H-shaped steel, as shown in FIG. 11, the upper flange X1 and the floor slab Y of the steel beam X are used. A metal fitting Z for integrally sandwiching a metal fitting Z is known. The metal fitting Z is composed of a plate-shaped gold plate Z1, a bolt Z2, and a nut Z3, and has a floor arranged above the upper flange X1 with one end of the gold plate Z1 in contact with the lower surface of the upper flange X1. The floor slab Y can be fixed to the upper flange X1 by penetrating the other ends of the plate Y and the gold plate Z1 with the bolt Z2 and tightening with the nut Z3. When this metal fitting Z is used, the frictional force generated by tightening the bolt resists the horizontal load acting on the building, but if the weight of the deck Y itself or the load on the upper part is large, the horizontal load increases. In some cases, the frictional force may be insufficient. Further, if the tightening force is increased by using the bolt Z2 having a large tightening torque value in order to resist a larger horizontal load, the floor slab Y may be destroyed.

Therefore, instead of integrally sandwiching the upper flange and floor slab of the steel beam, a mechanism for sandwiching the upper flange is provided on the gold plate, and the frictional force generated by the tightening force of the bolt and the sandwiching force of the gold plate resists the horizontal load. Metal fittings to be used have been proposed. (Patent Document 1, Patent Document 2, Patent Document 3)

JP-A-9-287229 JP 2006-2455 Japanese Patent Application Laid-Open No. 8-120815

However, the metal fittings described in Patent Document 1 and Patent Document 2 have a structure in which a flange is fitted into a groove portion formed by bending one gold plate and elastically sandwiched, so that the metal fittings are elastically sandwiched over time. Due to the influence of vibration acting on the building, the space between the grooves may be widened, the pinching force may be weakened, and the frictional force may be reduced. Further, after the floor slab is installed, it is difficult to confirm the pinching state of the groove portion, and even if the pinching force of the groove portion is weakened, it cannot be easily determined. Then, when the metal fittings described in Patent Documents 1 to 3 are to be sandwiched between flanges having a plate thickness larger than the groove portion spacing, the gold plate itself is replaced with a metal plate having a groove portion having a larger spacing each time. Must be replaced.

Therefore, the present invention has been made in view of the above-mentioned problems, and is a fixing bracket for fixing the floor slab to the upper part of a beam having a flat plate portion extending in the horizontal direction, and tightening force of the bolt. Another object of the present invention is to provide a fixing metal fitting that resists a horizontal load by a frictional force generated by a pinching force of a gold plate, can easily determine the pinching state of the gold plate even after construction, and can hold the pinching force.

The first fixing bracket of the present invention is a fixing bracket for fixing a floor slab to the upper part of the flat plate portion of a beam having a flat plate portion extending in the horizontal direction, and extends substantially horizontally and one end thereof is the flat plate. A first gold plate having a main body portion that abuts on the lower surface of the portion and the other end portion abuts on the lower surface of the deck, and a through hole formed between one end portion and the other end portion. a contact piece which abuts the upper surface of said plate, a fixing piece which abuts against the lower surface of the other end portion, the contact piece and the connecting the fixing piece, the connection piece is inserted into the through hole With the second gold plate having a substantially Z-shaped side view and the connection piece inserted, the floor slab and the second gold plate are inserted through the first gold plate on the other end side of the through hole. A fastening means for fastening the plate in the vertical direction is provided , and as the fastening means is fastened, one end of the plate is inclined to abut on the lower surface of the flat plate, and the contact piece is attached to the flat plate. abuts inclined upper surface, and is characterized sandwiching bond to Rukoto the said plate at one end portion and the contact piece.

The second fixing bracket of the present invention is characterized in that the abutting piece forms an acute angle with respect to the connecting piece.

The third fixing bracket of the present invention is characterized in that the fixing piece forms an obtuse angle with respect to the connection piece.

The fourth fixing bracket of the present invention is characterized in that the first gold plate is formed with a protruding piece protruding upward at the other end.

In the fixing structure of the present invention, the floor slab is fixed to the upper part of the flat plate portion of the beam having the flat plate portion extending in the horizontal direction by the fixing metal fitting according to any one of the first to fourth. In the structure, the flat plate portion is sandwiched between the one end portion and the contact piece, and the floor slab and the fixed piece arranged on the upper portion of the flat plate portion are fastened via the other end portion. It is characterized by fastening in the vertical direction by means.

According to the first fixing bracket of the present invention, the first gold plate has one end that can contact the lower surface of the flat plate portion and the other end that protrudes substantially horizontally from one end and can contact the lower surface of the deck. A through hole is formed between one end and the other end of the main body having a portion, and the second gold plate having a substantially Z-shape in the side view is a contact piece capable of contacting the upper surface of the flat plate portion. It has a fixed piece capable of contacting the lower surface of the other end portion, and a connecting piece that connects the contact piece and the fixed piece and is inserted into a through hole. Therefore, with the connecting piece inserted into the through hole, the flat plate portion is sandwiched between one end of the main body and the contact piece, and the floor slab and the second gold plate are moved up and down by the fastening means via the first gold plate. When fastened in the direction, the flat plate portion can be firmly sandwiched between one end of the main body and the contact piece, and the tightening force of the fastening means and the first and second gold plates to the flat plate portion can be fastened. The pinching force and the frictional force generated by it can resist the horizontal load acting on the building. Further, if only the second gold plate is replaced with a metal fitting corresponding to the plate thickness of the flat plate portion, it can be sandwiched between the flat plate portions of various thicknesses, so that the fixing bracket is excellent in convenience and economy. Can be done.

According to the second fixing bracket of the present invention, since the abutting piece forms an acute angle with respect to the connecting piece, a flat plate portion is sandwiched between one end of the main body and the abutting piece, and the flat plate portion is sandwiched between the first gold plate. When the floor slab and the second gold plate are fastened in the vertical direction by the fastening means, the contact piece can strongly press the upper surface of the flat plate portion, and the flat plate portion is more firmly sandwiched together with one end of the main body portion. Can be done.

According to the third fixing bracket of the present invention, since the fixing piece has an obtuse angle with respect to the connecting piece, a flat plate portion is sandwiched between one end of the first gold plate and the contact piece, and the flat plate portion is sandwiched between the first gold plate. When the floor slab and the second gold plate are fastened in the vertical direction by the fastening means, the tip of the fixing piece rotates in the direction close to the other end of the main body, and the tip of the contact piece is on the upper surface of the flat plate. The upper surface of the flat plate portion can be strongly pressed by rotating in the approaching direction, and the flat plate portion can be narrowed more firmly by the contact piece and one end portion of the main body portion.

According to the fourth fixing bracket of the present invention, since the first gold plate is formed with a protruding piece protruding upward at the other end, a flat plate portion is formed between one end of the first gold plate and the contact piece. When the floor slab and the second gold plate are fastened in the vertical direction by the fastening means via the first gold plate, the protruding piece comes into contact with the lower surface of the floor slab. Therefore, after tightening the fastening means, if it is confirmed from the lower surface side of the floor slab that the protruding piece is in contact with the floor slab, the tightening force of the fastening means and the flat plate portion of the first and second gold plates can be obtained. Since it can be determined whether or not the pinching force of the floor is weakened, it is possible to improve the construction accuracy and the efficiency at the time of inspection.

According to the fixing structure of the floor slab of the present invention, the floor slab is fixed to the upper part of the flat plate portion of the beam by the fixing metal fitting according to any one of the first to fourth, so that the tightening force by the fastening means and the first metal It is possible to resist the horizontal load acting on the building due to the frictional force generated by the pinching force of the plate and the second metal plate on the flat plate, and use bolts with an excessive tightening torque value to increase the frictional force. There is no risk of destroying the floor slab.

A cross-sectional view showing a fixed structure of a deck slab. The perspective view which shows the 1st gold plate, the 2nd gold plate, a bolt, and a nut. The front view which shows the 1st gold plate. The plan view which shows the 1st gold plate which formed the main body part in a C shape. The side view which shows the 2nd gold plate. FIG. 5 is a cross-sectional view showing how the second gold plate is fitted to the first gold plate. A perspective view showing how a floor slab is installed on a beam. A cross-sectional view showing a state in which a flat plate portion is sandwiched between an abutting portion and one end portion of a main body portion, and a bolt is penetrated through a floor slab, the other end portion of the main body portion, and a fixing piece. FIG. 5 is a cross-sectional view showing a state in which the upper end surface of the projecting piece is in contact with the lower surface of the floor slab and the nut is screwed to the tip of the bolt. A cross-sectional view showing a fixed structure of a deck slab. Sectional drawing which shows the fixing structure of the conventional floor slab.

Hereinafter, the best embodiment of the fixing bracket will be described with reference to each figure. The fixing metal fitting of the present application is a metal fitting used when fixing a floor slab to the upper part of an upper flange of a beam mainly made of H-shaped steel. The fixing bracket of the present application can be used as long as it is a beam having a flat plate portion extending in the horizontal direction such as I-shaped steel or C-shaped steel in addition to H-shaped steel, but here, the beam is H-shaped steel. The case where is described will be described.

As shown in FIG. 1, the fixing metal fitting 1 is a metal fitting for fixing the floor slab 3 to the upper part of the flat plate portion 21 extending in the horizontal direction of the beam 2 made of H-shaped steel, and the flat plate portion 21. One end 4a of the main body 41 having one end 4a that can come into contact with the lower surface 2a of the main body 41 and the other end 4b that protrudes substantially horizontally from the one end 41 and can come into contact with the lower surface 3a of the deck 3. Side view that abuts the first gold plate 4 in which the through hole 4c is formed between the end portion 4b and the upper surface 2b of the flat plate portion 21 and is inserted into the through hole 4c to fit with the first gold plate 4. In a state where the Z-shaped second gold plate 5 and the second gold plate 5 are fitted to the first gold plate 4, the floor slab 3 is placed on the other end 4b side of the through hole 4c via the first gold plate 4. It is provided with a fastening means 7 composed of a bolt 61 and a nut 62 for fastening the second metal plate 5 in the vertical direction.

As shown in FIGS. 2 and 3, the first gold plate 4 is a member formed by bending one gold plate, and is formed on a substantially rectangular plate-shaped main body 41 and one end 4a of the main body 41. It has a pair of reinforcing pieces 42 that reinforce the strength of the first gold plate 4 by bending both ends that are substantially orthogonal to each other downward at a substantially right angle. The main body 41 has a through hole 4c formed by an elongated hole extending substantially parallel to the edge of one end 4a of the main body 41, and a first portion formed on the other end 4b side of the through hole 4c. A 1-bolt hole 4d is provided, and the other end 4b is bent upward at the edge to form a protruding piece 43. Although the main body 41 is formed in a substantially rectangular plate shape in FIG. 2 and the like, the main body 41 may have another shape, for example, as shown in FIG. 4, as a C shape that opens to one end 4a side. May be good.

The projecting piece 43 is preferably formed so that the first angle θ1 with respect to the main body 41 shown in FIG. 2 is an acute angle, and in particular, it is preferably formed at an angle of 85 ° or more and less than 90 °. Further, when the first angle θ1 is an acute angle, the protruding piece 43 has a distance H from the upper surface of the main body 41 to the upper end surface of the protruding piece 43 longer than the plate thickness t1 of the flat plate portion 21 shown in FIG. Is formed in. By forming the projecting piece 43 in this way, as shown in FIG. 1, the upper end surface of the projecting piece 43 is brought into contact with the lower surface 3a of the floor slab 3, and the floor slab 3 and the other end 4b are brought into contact with the fastening means 7. When the second gold plate 5 is tightened and fixed, one end 4a of the main body 41 can press the lower surface 2a of the flat plate 21 closer to the flat plate 21 more strongly. The first angle θ1 of the protruding piece 43 does not necessarily have to be an acute angle, and may be a right angle or an obtuse angle. Further, the distance H is adjusted according to the angle of the first angle θ1, and the protruding piece 43 has a height at which the upper end surface of the protruding piece 43 surely contacts the lower surface 3a of the floor slab 3 when the fastening means 7 is tightened. Has

As shown in FIGS. 2 and 10, the second gold plate 5 is a member formed by bending one plate material, and is a contact piece 51 capable of contacting the upper surface 2b of the flat plate portion 21 and a contact piece. The connection piece 52 with one end of the connection piece 52 bent, and one end of the connection piece 52 on the opposite side to the contact piece 51 are bent in the direction opposite to the contact piece 51, and the lower surface 4e of the other end 4b of the main body 41 It has a fixed piece 53 that can be brought into contact with the device. Further, as shown in FIG. 5, the contact piece 51 is formed so that the second angle θ2 with respect to the connection piece 52 is an acute angle, and the fixed piece 53 is formed so that the third angle θ3 with respect to the connection piece 52 is an obtuse angle. It is desirable to form in. The second angle θ2 can be formed at, for example, about 85 °, and the third angle θ3 can be formed at, for example, about 100 °. The second angle θ2 and the third angle θ3 are not limited to these angles, and may be other angles as long as the above angle conditions are met. With such an angle, as shown in FIG. 10, the first gold plate 4 and the second gold plate 5 are tightened by the fastening means 7, and the fixing piece 53 is attached to the lower surface 4e of the other end 4b of the main body 41. When the contact pieces 51 are brought into contact with each other, the contact piece 51 can be inclined toward one end portion 4a of the main body portion 41 and strongly press the upper surface 2b of the flat plate portion 21.

As shown in FIG. 10, when the second gold plate 5 is fitted to the first gold plate 4 and the nut 62 is rotated in the tightening direction, the contact piece 51 is formed by the contact piece 51 on the upper surface 2b of the flat plate portion 21. It is formed by adjusting its height so as to abut against. As shown in FIG. 2, the fixing piece 53 is formed at a position where a second bolt hole 5a larger than the first bolt hole 4d is aligned with the first bolt hole 4d when the connection piece 52 is inserted into the through hole 4c. doing. Further, the first length L1 in the direction in which the corners of the abutting piece 51 and the connecting piece 52 extend is shorter than the length L2 in the longitudinal direction of the through hole 4c, and the third length of the fixed piece 53 on the connecting piece 52 side. The length L3 is formed longer than the length L2 in the longitudinal direction of the through hole 4c. The plate thickness t2 of the contact piece 51 and the connection piece 52 is formed to be shorter than the length W1 of the through hole 4c in the width direction.

As shown in FIG. 6, the second gold plate 5 formed in this way can be fitted into the first gold plate 4. That is, as shown in FIG. 6A, the tip of the contact piece 51 is inserted into the through hole 4c while facing the one end portion 4a side, and the fixing piece 53 is rotated so as to be close to the other end portion 4b to connect the connecting piece. 52 is inserted into the through hole 4c, and the second gold plate 5 is fitted into the first gold plate 4 as shown in FIG. 6 (b). At this time, as described above, the first length L1 of the contact piece 51 and the connection piece 52 is shorter than the length L2 of the through hole 4c in the longitudinal direction, and the third length L3 of the fixed piece 53 is Since the through hole 4c is formed longer than the length L2 in the longitudinal direction, only the contact piece 51 and the connection piece 52 can be inserted into the through hole 4c. Further, when the second gold plate 5 is fitted to the first gold plate 4, the contact piece 51 protrudes toward one end 4a from the through hole 4c, and the fixing piece 53 protrudes toward the other end 4b from the through hole 4c. Since it protrudes, it is possible to prevent the contact piece 51 and the fixing piece 53 from inadvertently coming out of the through hole 4c.

As shown in FIGS. 1 and 10, the bolt 61 constituting the fastening means 7 has a length capable of penetrating the floor slab 3, the other end 4b of the main body 41, and the fixing piece 53, and has an outer circumference. A male screw is formed on the surface. Further, the nut 62 can be screwed and tightened to the tip of the bolt 61. The fastening means 7 does not necessarily have to be composed of bolts 61 and nuts 62 as long as the floor slab 3 and the second gold plate 5 can be fastened in the vertical direction via the first gold plate 4.

Next, the floor slab fixing structure 8 using the fixing bracket 1 will be described. As shown in FIG. 1, the floor slab fixing structure 8 is a structure in which the floor slab 3 is fixed to the upper part of the flat plate portion 21 of the beam 2 having the flat plate portion 21 extending in the horizontal direction by the fixing metal fitting 1. .. As shown in FIG. 7, the long beam 2 extending in the horizontal direction is a horizontal member that can be hung on another beam or column (not shown) with the flat plate portion 21 facing upward.

As shown in FIGS. 1 and 7, the floor slab 3 is a flat plate-shaped floor material placed on the upper portion of the flat plate portion 21, and the material thereof is not particularly limited, but is an extrusion-molded cement slab or a lightweight cellular concrete slab. , Can be a long floor slab molded like a precast concrete slab. On the lower surface of the end portion of the floor slab 3, a notch 3b for avoiding interference with the fixing bracket 1 when the floor slab 3 is arranged on the flat plate portion 21 is provided in advance, and the floor slab 3 is provided with a notch 3b. At the position where the bolt 61 is inserted, a third bolt hole 3c that penetrates the floor slab 3 in the plate thickness direction is formed.

Next, the construction method of the fixed structure 8 of the floor slab will be described. First, as shown in FIG. 6, the first gold plate 4 and the second gold plate 5 are fitted and integrated in advance by the procedure described above, and as shown in FIG. 8, one end of the main body 41 of the first gold plate 4 is formed. The flat plate portion 21 of the beam 2 is sandwiched between the portion 4a and the contact piece 51 of the second gold plate 5. Then, the floor slab 3 is placed on the upper part of the flat plate portion 21 while matching the notch 3b at the position where the first gold plate 4 and the second gold plate 5 are installed, and the bolt 61 is placed on the third bolt of the floor slab 3. It communicates with the hole 3c, the first bolt hole 4d of the main body 41, and the second bolt hole 5a of the fixing piece 53, and penetrates each member. At this time, as described above, since the third length L3 of the fixing piece 53 is formed longer than the length L2 of the through hole 4c in the longitudinal direction, the fixing piece 53 is inadvertently removed from the through hole 4c. The first metal fitting 4 does not fall.

Further, since the second bolt hole 5a is larger than the first bolt hole 4d, even if the fixing piece 53 is tilted with respect to the main body 41, the position of the bolt 61 is finely adjusted to make the bolt 61 the first gold plate 4 and the second gold plate 4. It can be easily penetrated through the gold plate 5. Next, as shown in FIGS. 8 and 9, the upper end surface of the projecting piece 43 is brought into contact with the lower surface 3a of the floor slab in which the notch 3b is not formed. At this time, when the protruding piece 43 has an acute angle with respect to the main body 41 as shown in the illustrated example, one end 4a of the main body 41 is inclined toward the flat plate portion 21 and the lower surface 2a of the flat plate portion 21 is inclined. It will be pressed.

Subsequently, as shown in FIG. 9, the nut 62 is screwed onto the tip of the bolt 61 protruding from the lower surface of the fixing piece 53, and is rotated in the tightening direction until the fixing piece 53 abuts on the main body 41. At this time, since the fixing piece 53 has an obtuse angle with respect to the connecting piece 52, the second gold plate 5 lifted upward by tightening the nut 62 has an edge 5b on the connecting piece 52 side of the fixing piece 53. When it comes into contact with the main body 41, it rotates around the edge 5b as a fulcrum, the tip of the fixing piece 53 approaches the other end 4b, and the tip of the contact piece 51 approaches the upper surface 2b of the flat plate portion 21. Then, as shown in FIG. 10, when the second gold plate 5 rotates until the fixed piece 53 abuts on the lower surface 4e of the other end 4b, the tip of the abutting piece 51 firmly presses the upper surface 2b of the flat plate portion 21. By pressing, the flat plate portion 21 is sandwiched together with the one end portion 4a of the main body portion 41. At this time, since the abutting piece 51 forms an acute angle with respect to the connecting piece 52 and the one end portion 4a is inclined toward the flat plate portion 21, the flat plate portion 21 can be sandwiched more strongly.

The floor slab fixing structure 8 formed in this way is a building due to the frictional force of the tightening force of the fastening means 7 and the pinching force of the first gold plate 4 and the second gold plate 5 to the flat plate portion 21. Since it is possible to withstand the horizontal load acting on the floor slab, it is not necessary to use the bolt 61 having an excessive tightening torque value, and it is possible to prevent the floor slab from being damaged.

Further, whether or not the flat plate portion 21 is securely sandwiched between the contact piece 51 and the one end portion 4a is determined by the degree of tightening of the nut 62, the contact state of the fixed piece 53 with the other end portion 4b, and the protruding piece 43. It can be easily determined by visually checking the state of contact with the floor slab 3 from the lower surface 3a side of the floor slab. For example, if the fixing piece 53 is not in contact with the lower surface 4e of the other end 4b due to loosening of the nut 62 due to the influence of vibration or impact acting on the building, the contact piece 51 is in contact with the upper surface 2b of the flat plate portion 21. If the upper end surface of the protruding piece 43 is not in contact with the lower surface 3a of the floor slab, it can be determined that the one end portion 4a is not in contact with the lower surface 2a of the flat plate portion 21. Further, as a result of confirmation, if the nut 62 is loosened, if the nut 62 is tightened again from the lower surface 3a side of the floor slab, the flat plate portion 21 is sandwiched between the first gold plate 4 and the second gold plate 5. can do. Therefore, the fixing bracket 1 and the floor slab fixing structure 8 using the fixing bracket 1 can improve the construction accuracy and the efficiency at the time of inspection to maintain a more stable frictional force, and are effective against a horizontal load. You can resist.

Further, since the first gold plate 4 and the second gold plate 5 sandwiching the flat plate portion 21 are divided into two members, when the fixing bracket 1 is used for the flat plate portions 21 having different plate thicknesses, the fixing bracket 1 is used. It is not necessary to replace both the first gold plate 4 and the second gold plate 5 of No. 1, and if only the second gold plate 5 is replaced with a metal fitting corresponding to the plate thickness of the flat plate portion 21, the flat plate portion 21 having various thicknesses can be obtained. It can be sandwiched and can be a fixing metal fitting 1 having excellent convenience and economy.

Further, the embodiment of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the scope of the idea of the present invention.

The fixing bracket and the floor slab fixing structure according to the present invention can be suitably used when fixing the floor slab to a steel beam having a flange.

1 Fixing bracket 2 Beam 21 Flat plate 2a Lower surface of flat plate 2b Upper surface of flat plate 3 Floor slab 4 First gold plate 41 Main body 43 Protruding piece 4a One end 4b Other end 4c Through hole 4e Lower surface of other end 5 2 Gold plate 51 Contact piece 52 Connection piece 53 Fixing piece 7 Fastening means 8 Floor slab fixing structure

Claims (5)

A fixing bracket for fixing a deck to the upper part of the flat plate portion of a beam having a flat plate portion extending in the horizontal direction.
It extends in a substantially horizontal direction, has a main body portion in which one end abuts on the lower surface of the flat plate portion and the other end abuts on the lower surface of the deck, and penetrates between one end and the other end. The first gold plate with holes and
A contact piece which abuts the upper surface of said plate, a fixing piece which abuts against the lower surface of the other end portion, the contact piece and the connecting the fixing piece, the connection piece is inserted into the through hole A second gold plate with a side view of Z-shape, which has
In the inserted state of the connection piece, the floor slab and the second gold plate are fastened in the vertical direction via the first gold plate on the other end side of the through hole .
With the fastening of the fastening means, the one end portion is inclined to abut on the lower surface of the flat plate portion, the abutting piece is inclined to abut on the upper surface of the flat plate portion, and the one end portion and the said fixing bracket, wherein sandwiching bond to Rukoto the said plate in the contact piece. The fixing bracket according to claim 1, wherein the abutting piece forms an acute angle with respect to the connecting piece. The fixing bracket according to claim 1 or 2, wherein the fixing piece has an obtuse angle with respect to the connection piece. The fixing bracket according to any one of claims 1 to 3, wherein the first gold plate is formed with a protruding piece protruding upward at the other end. A floor slab fixing structure in which the floor slab is fixed to the upper part of the flat plate portion of a beam having a flat plate portion extending in the horizontal direction by the fixing bracket according to any one of claims 1 to 4.
The flat plate portion is sandwiched between the one end portion and the contact piece,
A floor slab fixing structure characterized in that the floor slab and the fixing piece arranged on the upper portion of the flat plate portion are fastened in the vertical direction by the fastening means via the other end portion.

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