JP7075782B2 - Deck plate with reinforcing bar truss and floor slab structure - Google Patents

Description

The present invention relates to a deck plate with a reinforcing bar truss and a floor slab structure using the same.

Conventionally, deck plates may be used when constructing floor slabs. The deck plate functions as a formwork and integrates with the concrete.

In order to join the steel beam and the floor slab using such a deck plate, a stud connector is used (for example, Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2002-188209 JP-A-2015-227600

By using such a stud connector, for example, even in the event of an earthquake, the inertial force acting on the floor can be transmitted to the steel beam, and the floor slab can be reliably fixed to the steel beam. In addition, since the upper flange of the steel beam made of H steel can be integrated with the floor slab, the floor slab contributes to the bending resistance of the steel beam and improves the overall rigidity due to the synthetic effect with concrete. Can be done.

However, in order to obtain the above effect, it is necessary to weld a large number of stud connectors onto the steel beam.

The present invention has been made in view of such a problem, and is a deck plate with a reinforcing bar truss and a floor slab structure capable of reliably joining a beam and a floor slab even if the number of stud connectors used is reduced. The purpose is to provide the body.

In order to achieve the above-mentioned object, the first invention is a deck plate with a reinforcing bar truss, which is a reinforcing bar truss having a plate-shaped deck plate and a reinforcing bar, which is joined to the deck plate and has an upper main bar, a lower main bar, and a lattice bar. And an end member joined to the end portion of the deck plate, the end member is substantially orthogonal to the plate-shaped main bar support portion that stands substantially perpendicular to the deck plate and the main bar support portion. The main bar support portion has a hole through which the end portion of the lower main bar is fixed, and the inner diameter of the hole is such that the deck plate has a beam joint protruding from the end portion. The upper main bar is a deck plate with a reinforcing bar truss, which is 3 to 8 times the diameter of the lower main bar and is joined on the upper side of the main bar support portion .

It is desirable that the tubular member is inserted into the hole, the tubular member and the main bar support portion are joined, and the lower main bar is inserted into the tubular member and fixed to the hole via the tubular member .

According to the first invention, since an end member protruding from the end of the deck plate is provided and the end member is joined to the main bar, the protruding portion of the end member is joined to the steel beam to form a floor slab. The steel beam can be securely integrated with the steel beam to fix the steel beam and the floor slab.

At this time, since the end member is formed with a hole having a diameter of 3 to 8 times the diameter of the lower main bar, concrete can be further filled in the hole even when the lower main bar is inserted into the hole. Therefore, the filled concrete resists shearing, which acts as a perforated steel plate gibber, so that the end member can function as a slip stopper between the steel beam and the floor slab. In addition, the shearing force via the floor slab can be transmitted to the beam because the main bar support portion that stands up substantially vertically exerts bearing resistance. That is, the end member can exert the function of the conventional stud connector to form a synthetic beam that integrates concrete and the beam and the function of transmitting the inertial force acting on the floor to the beam. Therefore, the number of stud connectors can be reduced, and the construction work of the stud connectors can be reduced.

Further, by joining the upper main bar to the upper part of the main bar support portion, the upper main bar and the main bar support portion can be reliably joined.

The second invention is a floor slab structure using a deck plate with a reinforcing bar truss according to the first invention, wherein the deck plate with a reinforcing bar truss is hung between a pair of beams and has the reinforcing bar truss. The beam joint portion of the deck plate is welded to each of the beams, concrete is cast on the deck plate with a reinforcing bar truss, and the inside of the hole is filled with the concrete. It is a floor slab structure.

According to the second invention, the inertial force acting on the floor can be transmitted to the steel frame beam, and the floor slab structure that functions as a synthetic beam having high rigidity can be obtained by the synthetic effect.

According to the present invention, it is possible to provide a deck plate with a reinforcing bar truss and a floor slab structure capable of reliably joining a beam and a floor slab even if the number of stud connectors used is reduced.

The perspective view which shows the deck plate fixing structure 10. (A) is a front view of the deck plate fixing structure 10, and (b) is a sectional view taken along line AA of (a). The figure which shows the process of installing the deck plate 1 with a reinforcing bar truss. The figure which shows the floor slab structure 20. The figure which shows the other fixed structure.

Hereinafter, the deck plate 1 with a reinforcing bar truss according to the embodiment of the present invention will be described. 1 is a perspective view showing a deck plate fixing structure 10 using a deck plate 1 with a reinforcing bar truss, FIG. 2A is a front view of the deck plate fixing structure 10, and FIG. 2B is FIG. 2 (b). It is a cross-sectional view taken along the line AA of a). The deck plate 1 with a reinforcing bar truss is mainly composed of a deck plate 3, an upper main bar 5a, a lower main bar 5b, a lattice bar 7, and the like.

The deck plate 3 is a plate-shaped steel member, and upper main bars 5a and lower main bars 5b, which are main reinforcing bars, are arranged and fixed along the longitudinal direction of the deck plate 3. In the illustrated example, one upper main bar 5a is arranged in a triangular shape with respect to the pair of lower main bars 5b, and a total of three upper main bars 5a and a pair of lower main bars 5b are arranged side by side. Further, the lattice bars 7 are joined to the deck plate 3, the upper main bar 5a and the lower main bar 5b at a predetermined angle to form a reinforcing bar truss.

Such a reinforcing bar truss functions as a reinforcing bar structure of a floor slab after the concrete is placed, which will be described later. Further, since the reinforcing bar truss is joined to the deck plate 3 in advance, the assembly work at the site can be reduced.

An end member 9 is joined to the end portion of the deck plate 3 in the longitudinal direction. The end member 9 has a main bar support portion 11 and a beam joint portion 13. The main bar support portion 11 stands up substantially perpendicular to the deck plate 3. A pair of holes 16 are formed in the main bar support portion 11. The lower main bar 5b penetrates the hole 16 and is fixed by the welded portion 17c. Further, the upper main bar 5a is fixed to the upper part of the main bar support portion 11 by the welded portion 17b.

It is desirable that the inner diameter of the hole 16 is 3 to 8 times the outer diameter of the lower main bar 5b. Since the slip prevention effect of the beam 15 and the floor slab, which will be described later, is determined by the shear resistance of the circular side surface of the concrete filled in the hole 16, if the inner diameter of the hole 16 is too small, the slip prevention effect on the concrete becomes small. In order to surely obtain this effect, a hole size at least three times as large as that of the lower main muscle 5b is required. Further, if the hole 16 is too large, the shear resistance in the hole-filled concrete portion increases, but the end member 9 may be out-of-plane deformation and shear fracture may occur. Further, when trying to prevent the end member 9 from being broken, the end member 9 becomes large.

The arrangement position and number of the upper main bar 5a and the lower main bar 5b are not limited to the illustrated example. Further, a hole may be further formed in the main bar support portion 11, and the upper main bar 5a may also be inserted through the hole and joined.

The beam joint portion 13 is arranged so as to be substantially orthogonal to the main bar support portion 11. One end of the beam joint 13 projects from the end of the deck plate 3. The beam joining portion 13 is joined to the beam 15 at the welded portion 17a. That is, the deck plate 1 with the reinforcing bar truss is joined to the beam 15.

Next, the construction method of the floor slab structure will be described. As shown in FIG. 3, a beam 15 is arranged between the four pillars 19. Further, between the beams 15 facing each other, a plurality of small beams are fixed substantially parallel to the beams 15, if necessary. A deck plate 1 with a reinforcing bar truss is bridged between the opposing beams 15. At this time, as described above, the beam joining portion 13 of the end member 9 is joined to the beam 15.

The end member 9 may be arranged not only at the end portion of the deck plate 1 with a reinforcing bar truss in the longitudinal direction but also in a direction orthogonal to the end portion. For example, as shown in the figure, the end member 9 may be fixed to the long side of the deck plate 1 with a reinforcing bar truss, and the end member 9 may be further joined to the beam 15.

FIG. 4 shows a state in which the floor slab structure 20 is constructed by placing concrete 21 upward in a state where the deck plate 1 with a reinforcing bar truss is arranged in this way. At this time, the deck plate 3 functions as a formwork.

In this way, the concrete 21 integrates the deck plate 1 with the reinforcing bar truss and the beam 15. That is, at the time of placing the concrete 21, the load is received by the deck plate 3, and the force is transmitted to the reinforcing bar truss joined to the deck plate 3 and finally to the beam 15.

Further, the concrete 21 also enters the holes 16 and hardens. Therefore, the hole 16 functions as a slip stopper. Therefore, the force can be reliably transmitted between the concrete 21 and the end member 9. That is, the function of integrating the concrete 21 and the beam 15 into a synthetic beam can be exhibited.

The end member 9 may be joined to the deck plate 3 at the site or at the factory. Further, the deck plate 3 to which the reinforcing bar truss is joined is cut to a predetermined length and used as needed. At this time, depending on the cutting position of the lattice bar 7, the upper main bar 5a and the lower main bar 5b may not be supported by the deck plate 3 in the vicinity of the end portion of the deck plate 3, resulting in a state like a cantilever. Even in this case, by joining the end members 9, the positions of the upper main bar 5a and the lower main bar 5b are maintained at the time of placing the concrete 21, and the upper main bar 5a, regardless of the cutting position of the lattice bar 7, is surely held. The force can be transmitted from the lower main bar 5b to the beam 15.

As described above, according to the present embodiment, since the end member 9 of the deck plate 1 with the reinforcing bar truss functions as a slip stopper, the beam 15 and the concrete 21 are integrated, for example, the inertial force of the concrete 21 in the event of an earthquake. Can be reliably transmitted to the beam 15.

Further, in the calculation of the structural frame, the strength of the concrete 21 placed on the deck plate 1 with the reinforcing bar truss can be taken into consideration as the strength of the beam 15. At this time, the number of stud connectors can be reduced.

Further, since the end member 9 is joined to the upper main bar 5a and the lower main bar 5b, even when the deck plate 1 with the reinforcing bar truss is cut and used, the end member 9 ensures that the upper main bar 5a and the lower main bar 5b are used. Can hold position and transmit force.

Next, the second embodiment will be described. FIG. 5 is a diagram showing an end member 9 according to the second embodiment. In the following description, the configurations having the same functions as those of the first embodiment are designated by the same reference numerals as those in FIGS. 1 to 4, and duplicated description will be omitted.

In the second embodiment, the lower main bar 5b is not directly inserted into the hole 16, but the tubular member 23 is inserted into the hole 16 and the lower main bar 5b is inserted into the tubular member 23. The tubular member 23 and the main bar support portion 11 are joined by welding.

In this way, the lower main bar 5b may be inserted into the hole 16 via the tubular member 23 and fixed, instead of being directly inserted into the hole 16. Even in this case, the concrete 21 is filled in the tubular member 23, and the end member 9 can function as a perforated steel plate gibber.

Although the embodiments of the present invention have been described above with reference to the attached drawings, the technical scope of the present invention does not depend on the above-described embodiments. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs to.

1 ………… Deck plate with reinforced truss 3 ………… Deck plate 5a ………… Upper main bar 5b ………… Lower main bar 7 ………… Lattice bar 9 ………… End member 10 ………… Deck plate fixing structure 11 …… … Main bar support 13 ………… Beam joint 15 ………… Beam 16 ………… Holes 17a, 17b, 17c ………… Welded part 19 ………… Column 20 ………… Floor slab structure 21 ………… Concrete 23 ……… Cylinder member

Claims (3)

It is a deck plate with a reinforcing bar truss,
A plate-shaped deck plate and
Reinforcing bar trusses joined to the deck plate and having an upper main bar, a lower main bar and a lattice bar,
An end member joined to the end of the deck plate,
Equipped with
The end member has a plate-shaped main bar support portion that stands substantially perpendicular to the deck plate, and a beam joint portion that is substantially orthogonal to the main bar support portion and projects from the end portion of the deck plate.
The main bar support portion has a hole through which the end portion of the lower main bar is fixed.
The inner diameter of the hole is 3 to 8 times the diameter of the lower main bar .
The upper main bar is a deck plate with a reinforcing bar truss, which is joined on the upper side of the main bar support portion . A tubular member is inserted into the hole, and the tubular member and the main bar support portion are joined to each other.
The deck plate with a reinforcing bar truss according to claim 1 , wherein the lower main bar is inserted into the tubular member and fixed to the hole via the tubular member . A floor slab structure using the deck plate with a reinforcing bar truss according to claim 1 or 2.
The deck plate with a reinforcing bar truss is hung between a pair of beams.
The beam joints of the deck plate with reinforcing bar truss are welded to the respective beams.
A floor slab structure characterized in that concrete is placed on a deck plate with a reinforcing bar truss and the concrete is filled inside the holes.

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