JP2017066714A - Steel beam support reinforcing structure of slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel beam support reinforcing structure of a slab in which a lateral buckling of a steel beam can be prevented while suppressing the increase by the number of members, the increase by weight, and the increase by material costs, and the yield strength decrease due to breakdown of a concrete slab such as cone-type failures around the stud can be avoided.SOLUTION: A steel beam support reinforcing structure of a slab is provided for supporting an edge 3a of a slab 3 on the upper surface of a steel beam 1. Multiple studs 7 are provided which are arranged in the longitudinal direction on the upper surface of the steel beam. Multiple or one consecutive slab edge reinforcing bars 8 are provided which has a folding part 8a and extends to the direction apart from the steel beam 1 astride the folding part 8a to each stud 7. The slab 3 is included which has a concrete layer 6 with this slab edge reinforcing bar 8 embedded therein and has the edge mounted on the steel beam 1. The slab edge reinforcing bar 8 is, for example, a V-shaped bar or a meandering bar.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a steel beam support portion reinforcing structure for a slab that reinforces a portion connecting a concrete slab to a steel beam.

  2. Description of the Related Art Conventionally, as a floor structure of a building, a floor structure in which a reinforced concrete floor slab or a synthetic floor flav with a concrete layer on a deck plate is installed on a steel beam made of H-shaped steel is widely used. . In such a floor structure, slabs are arranged on both sides of the steel beam inside the building, but there are cases where the slab is arranged only on one side of the steel beam, such as a steel beam along the outer wall. In the configuration in which the slab is arranged only on one side, when a large external force is applied due to an earthquake or the like, the steel beam is laterally buckled, that is, the flange on the compression side of the H-shaped steel steel beam is twisted and the cross section is weakened. It may cause a phenomenon of sudden deformation in the axial direction.

  In order to prevent such lateral buckling, a horizontal stiffener that is a small beam or the like is generally used for the steel beam. As the transverse stiffener, H-section steel or the like is generally used. However, when a horizontal stiffener made of H-shaped steel is provided on a steel beam, the number of steel members increases and the weight of the frame increases, resulting in an increase in material costs, processing costs, and construction costs.

  As a configuration to solve such problems, it has been proposed to join a headed stud on a steel beam and embed the headed stud in the concrete of the floor slab to integrate the concrete and the steel beam. (For example, patent document 1).

JP2015-21283A

  However, when a slab is placed only on one side of a steel beam, such as a steel beam along the outer wall, in the configuration where a headed stud is simply provided, if a large load is applied due to seismic force, etc., the concrete around the stud In addition, the yield strength may be reduced due to the destruction of the concrete slab, such as cone-like destruction.

The object of the present invention is to provide a slab that can prevent lateral buckling of a steel beam while suppressing an increase in the number of members, an increase in weight, and an increase in material cost, and avoiding a decrease in yield strength due to a fracture of a concrete slab such as a cone-shaped fracture around a stud. It is to provide a steel beam support reinforcing structure.

The steel beam support part reinforcement structure of the slab of the present invention is a steel beam support part reinforcement structure of a slab that supports the edge of the slab on the upper surface of the steel beam,
A plurality of studs arranged on the upper surface of the steel beam in the longitudinal direction of the steel beam, and a plurality of studs that have folded portions and extend in the substantially horizontal direction across the folded portions of the studs. It is characterized by comprising a continuous slab edge reinforcement and a slab having a concrete layer in which the slab edge reinforcement is embedded and on which the edge is placed on the steel beam.

According to this configuration, the steel beam is provided with studs, and slab edge reinforcing bars having folded portions are provided across the studs at the folded portions, and these studs and slab edge reinforcing bars are provided on the concrete layer of the slab. Since it is embedded, the slab edge reinforcement is fixed to the concrete layer, the slab and the steel beam are integrated, and the tensile force acting on the slab edge reinforcement is received by the stud.
For this reason, lateral buckling of the steel beam is prevented. Moreover, since it is reinforced by the slab edge reinforcing bar and the stud, unlike the case where the stud is simply provided, it is possible to avoid a decrease in the yield strength due to the destruction of the concrete slab such as a cone-like fracture around the stud. In addition, the effect of preventing the lateral movement of the beam by the slab edge reinforcement can be expected even after a crack or split occurs in the concrete. Furthermore, since only the stud and the slab edge reinforcing bar are provided, an increase in the number of members, an increase in weight, and an increase in material cost can be suppressed unlike a configuration in which a horizontal stiffener made of a conventional H-section steel or the like is provided.

In this invention, the slab is composed of a corrugated deck plate and the concrete layer placed on the deck plate, and the slab edge reinforcing bars are placed over a plurality of peaks of the deck plate. You may make it have.
Many slabs composed of a deck plate and a concrete layer are used, but the bottom surface of the deck plate is corrugated, so if the slab edge reinforcement is U-shaped, for example, the pitch of the deck plate and the slab Due to the difference from the arrangement interval of the edge reinforcing bars, a portion where the slab edge reinforcing bars do not contact the deck plate occurs. This slab edge reinforcement that does not contact the deck plate is supported by some support member such as a spacer or the like in order to maintain the position of the slab edge reinforcement before placing the concrete during slab construction. It is necessary to support by binding to the reinforcing bar. For this reason, the labor for arranging the support members increases, the construction takes time, and the cost increases.
On the other hand, if the slab edge reinforcement has a shape that has a portion that covers the plurality of peaks of the deck plate, the slab edge reinforcement is placed directly on the peak of the deck plate and supported. This eliminates the need for a support member or bundling. Therefore, it is possible to reduce the labor and material cost for arranging the support member.

In the case where the slab edge reinforcing bar has a shape having a portion that covers a plurality of peaks of the deck plate, as a specific configuration, the slab edge reinforcing bar includes the folded part and the folded part. Each stud has a V-shape having a portion extending from both ends, and there are a plurality of V-shaped slab edge reinforcing bars, and the folded portions of the slab edge reinforcing bars are arranged in the longitudinal direction of the steel beam. You may make it straddle.
When the slab edge reinforcing bars are V-shaped in this way, the slab edge reinforcing bars can be placed over a plurality of peaks of the deck plate, eliminating the need for support members and binding, Is only required to be bent into a V shape, and the manufacture of the slab edge reinforcement is facilitated.

Further, in the present invention, as another example in which the slab edge reinforcing bar has a portion having a portion mounted on a plurality of peaks of the deck plate, the slab edge reinforcing bar has a meandering shape, One folded portion of the slab edge reinforcing bars may straddle the studs arranged in the longitudinal direction of the steel beam.
When the slab edge reinforcing bar has a meandering shape, in the case of the slab having the deck plate, the folded portion located on the opposite side of the steel beam has a peak portion of the deck plate regardless of the pitch of the peak portion of the deck plate. It will be posted over. Therefore, the supporting member for supporting the slab edge reinforcement at the time of construction and the work of binding are unnecessary, and the workability is excellent.

The steel beam support part reinforcing structure for a slab according to the present invention is a steel beam support part reinforcing structure for a slab that supports the edge of the slab on the upper surface of the steel beam, and is provided on the upper surface of the steel beam in the longitudinal direction of the steel beam. A plurality of studs provided side by side, a plurality of or one continuous slab edge reinforcing bars that have folded portions and extend in the horizontal direction across the studs at the folded portions, and the slab edge portions Since it has a concrete layer with reinforcing bars embedded and a slab on which the edge is placed on the steel beam, it can prevent lateral buckling of the steel beam while suppressing an increase in the number of members, an increase in weight, and an increase in material cost, and a stud It is possible to avoid a decrease in yield strength due to the destruction of concrete slabs such as surrounding cone-like destruction.

It is a horizontal sectional view in the steel beam support part reinforcement structure of the slab concerning a 1st embodiment of this invention. It is the elements on larger scale of the deck plate in the steel beam support part reinforcement structure. It is front sectional drawing of the steel beam support part reinforcement structure. It is a right side sectional view of the steel beam support part reinforcement structure. It is a horizontal sectional view in the steel beam support part reinforcement structure of the slab concerning other embodiments of this invention. It is front sectional drawing of the steel beam support part reinforcement structure. It is a right side sectional view of the steel beam support part reinforcement structure. (A)-(C) are the horizontal sectional view, fracture | rupture front view, and right side sectional drawing in the steel beam support part reinforcement structure of the slab which concerns on further another embodiment, respectively. (A)-(C) is the horizontal sectional view, front sectional drawing, and right side sectional drawing in the steel beam support part reinforcement structure of the slab which concerns on other embodiment, respectively.

  A first embodiment of the present invention will be described with reference to FIGS. The steel beam support portion reinforcing structure of the slab is a structure that supports the edge 3a of the slab 3 on the upper surface of the steel beam 1 and reinforces the periphery of the support portion. The steel beam 1 is made of H-shaped steel and is joined to the steel column 2. In this example, the steel beam 1 is provided in two directions of the steel column 2. The steel column 2 is made of a square steel pipe, and is provided with two upper and lower diaphragms 4 protruding from the four outer sides at the height position where the steel beam 1 is joined. In the steel beam 1, the end surfaces of the upper and lower flanges 1 a (FIG. 3) are joined to the end surfaces of the upper and lower diaphragms 4 of the steel column 2 by complete penetration welding or the like.

  The slab 3 is a floor slab, and is composed of a deck plate 5 and a concrete layer 6 cast on the upper surface thereof. As shown in FIG. 2, the deck plate 5 is made of a corrugated steel plate having a trapezoidal or rectangular cross section. In FIG. 1, the slab 3 has edges 3 a and 3 b along two adjacent sides placed on the upper surface of the steel beam 1 in each direction, and is cut along the outer peripheral surface of the steel column 2 around the steel column 2. The shape is missing.

  In the above configuration, as reinforcement of the slab 3, a plurality of studs 7 are arranged on the upper surface of each steel beam 1 in the longitudinal direction at the center in the width direction of the steel beam 1 at regular intervals. A plurality of slab edge reinforcing bars 8 are provided on one edge 3a of the slab 3, that is, the edge 3a of the side where the cross section of the deck plate 5 is corrugated. The slab edge reinforcement 8 and the stud 7 are embedded in the concrete layer 6 of the slab 3. In the other edge 3 b of the slab 3, only the stud 7 is embedded in the concrete layer 6 without providing the slab edge reinforcing bar 8. The stud 7 is a steel headed stud, and is joined to the steel beam 1 by welding at the proximal end. For the slab edge reinforcing bar 8, for example, a deformed bar is used.

  The slab edge reinforcing bar 8 has a V shape having a folded portion 8a and a linear portion 8b extending obliquely from both ends of the folded portion 8a. That is, the slab edge reinforcing bars 8 are V-shaped bars. Each slab edge reinforcing bar 8 straddles the folded portion 8 a so as to be hooked on each stud 7, and the linear portion 8 b extends in a direction away from the steel beam 1. As shown in FIG. 2, the slab edge reinforcing bars 8 are placed on the deck plate 5 by being directly mounted on the plurality of peaks 5 a of the deck plate 5, and thereby the steel beam 1 rather than the base end of the stud 7. The height is raised from the top surface. The slab edge reinforcing bars 8 straddling the studs 7 at the turn-back portions 8a intersect and overlap each other, and the upper slab edge reinforcing bars 8 overlap the lower slab edge reinforcing bars 8. Is placed on the upper surface of the deck plate 5.

  The slab edge reinforcing bar 8A closest to the steel column 2 has a folded portion 8a. However, in order to avoid interference with various members around the slab edge reinforcing bar 8A, Has been.

According to the reinforcing structure for supporting a steel beam of a slab having the above-described configuration, the steel beam 1 is provided with the stud 7, and the slab edge reinforcing bar 8 having the folded portion 8a extends over each stud 7 at the folded portion 8a. Since the stud 7 and the slab edge reinforcement 8 are embedded in the concrete layer 6 of the slab 3, the slab edge reinforcement 8 is fixed to the concrete layer 6, and the slab 3 and the steel beam 1 are integrated. In addition, a tensile force acting on the slab edge reinforcing bar 8 is received by the stud 7.
For this reason, the lateral buckling of the steel beam 1 is prevented. Further, since the reinforcement is made by the slab edge reinforcing bars 8 and the studs 7, unlike the case where the studs 7 are simply provided, it is possible to avoid a decrease in the yield strength due to the destruction of the concrete slab such as the cone-like destruction around the studs. Further, since only the stud 7 and the slab edge reinforcing bar 8 are added, an increase in weight and material cost can be suppressed unlike a configuration in which a horizontal stiffener made of a conventional H-section steel or the like is provided.

Further, since the slab edge reinforcing bars 8 are V-shaped bars and are placed over the plurality of peaks 5a of the deck plate 5, the slab edge reinforcing bars 8 are directly placed on the deck plate 5 and supported. This eliminates the need for support members and binding. Therefore, it is possible to reduce the labor and material cost for arranging the members.
When the slab edge reinforcing bar 8 is a V-shaped bar, unlike the case of a U-shaped bar, the length in contact with the deck plate 5 is short, and the portion that does not contact the deck plate 5 adheres to the concrete layer 6. Stress can be expected all around. Therefore, the fixing length when the slab edge reinforcing bars 8 are directly placed on the deck plate 5 as U-shaped bars can be made shorter. This also reduces the amount of reinforcing bars and can reduce the member cost.

5 to 7 show other embodiments of the present invention. In this embodiment and each embodiment described below, matters that are not particularly described are the same as those in the first embodiment shown in FIGS. 1 to 4, and redundant description may be omitted.
In the embodiment of FIGS. 5 to 7, the slab edge reinforcing bar 8 </ b> B is meandering with a continuous S-shaped portion, instead of using the V-shaped bar for the slab edge reinforcing bar 8 in the first embodiment. It is a streak. This meander-shaped slab edge reinforcing bar 8B is composed of a folded portion 8a and a straight portion 8b on both sides, and each folded portion 8a on one edge spans each stud 7 aligned in the longitudinal direction of the steel beam 1. I try to get Each linear part 8b is mutually parallel.

Even when the slab edge reinforcing bars 8B serving as meandering bars are used as described above, the slab edge reinforcing bars 8B are placed directly on the deck plate 5 because the slab edge reinforcing bars 8B are placed over the plurality of peaks 5a of the deck plate 5. It can support, and a support member and a bundling become unnecessary.
Further, when the slab edge reinforcing bar 8B is a meandering bar, the folded part 8a opposite to the stud 7 is folded at 180 degrees with respect to the fixing stress to the concrete layer 6 and functions as a hook. When the streak is placed directly, it can be made shorter than the fixing length required.

  8A to 8C show still another embodiment of the present invention. In this embodiment, the slab edge reinforcing bar 8B made of a meandering bar described with reference to FIGS. 5 to 7 is used, but the deck plate is not used for the slab 3 and the slab 3 is made of a concrete layer 6 made of on-site reinforced concrete. It is a thing. The form on the lower surface for forming the concrete layer 6 is a discarded form 11. The slab edge reinforcing bar 8B is floated upward from the discarded mold 11. The configuration in which the slab edge reinforcing bar 8B is supported by being lifted from the discarded mold frame 11 is, for example, binding the slab edge reinforcing bar 8B to a surrounding reinforcing bar with a binding wire (both not shown) or a support member (FIG. (Not shown) is supported on the discarded mold 11. In this embodiment, the slab edge reinforcing bars 8B are lifted from the discarded mold frame 11, but the slab edge reinforcing bars 8B can be placed on the discarded mold frame 11.

  Even in such a configuration, it is possible to prevent lateral buckling of the steel beam while suppressing an increase in weight and material cost, and to prevent a decrease in yield strength due to a concrete slab failure such as a cone-like failure around the stud.

When the slab edge reinforcing bars 8B made of meandering bars are lifted from the mold 11 in this way, the entire circumference of the slab edge reinforcing bars 8B contributes to fixing to the concrete layer 6, and therefore the slab edge reinforcing bars 8B The fixing length can be further shortened. The support for floating the slab edge reinforcing bars 8B requires a bundling or a support member, but this can be reduced compared to the case where a plurality of U-shaped bars are used.
Therefore, also in this configuration, the lateral buckling of the steel beam can be prevented while suppressing an increase in weight and material cost, and a decrease in yield strength due to the destruction of the concrete slab such as a cone-like fracture around the stud can be avoided.

9A to 9C, in the first embodiment in which the deck plate 5 is used for the slab 3 shown in FIGS. 1 to 4, instead of the slab edge reinforcing bars 8 made of V-shaped lines, An example in which a slab edge reinforcing bar 8C made of a U-shaped line is provided is shown. The slab edge reinforcing bar 8C includes a folded portion 8a and two parallel linear portions 8b.
If the slab edge reinforcing bar 8C is a U-shaped bar, the slab edge reinforcing bar 8C has a relationship between the arrangement pitch of the slab edge reinforcing bars 8C and the pitch of the wavy portions 5a of the deck plate 5 (see FIG. 2). Although a portion that cannot be supported by the deck plate 5 is generated, even if U-shaped streaks are arranged, it is possible to directly support the deck plate 5 by performing a process such as matching the arrangement pitch of both.
Therefore, also in this embodiment, while suppressing the increase in weight and material cost, it is possible to prevent the lateral buckling of the steel beam and to avoid the decrease in the proof stress due to the destruction of the concrete slab such as the cone-like fracture around the stud. be able to.

  As mentioned above, although the form for implementing this invention based on the Example was demonstrated, embodiment disclosed here is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 ... Steel beam 2 ... Steel column 3 ... Slab 3a ... Edge 4 ... Diaphragm 5 ... Deck plate 5a ... Mountain part 6 ... Concrete layer 7 ... Stud 7a ... Head 8 ... Slab edge reinforcement 8a ... Folding part 8b ... Linear portions 8A, 8B, 8C ... Slab edge reinforcement

Claims (4)

A steel beam support reinforcement structure for a slab that supports the edge of the slab on the upper surface of the steel beam,
A plurality of studs arranged on the upper surface of the steel beam in the longitudinal direction of the steel beam, and a plurality of studs that have folded portions and extend in the substantially horizontal direction across the folded portions of the studs. A steel beam support part reinforcing structure for a slab, comprising: a continuous slab edge reinforcing bar; and a slab having a concrete layer in which the slab edge reinforcing bar is embedded and the edge is placed on the steel beam.   The steel beam support part reinforcing structure for a slab according to claim 1, wherein the slab is composed of a corrugated deck plate and the concrete layer placed on the deck plate, and the slab edge reinforcing bar is the deck. The steel beam support part reinforcement structure of the slab which has the part mounted over the several peak part of a plate.   The steel beam support part reinforcing structure for a slab according to claim 2, wherein the slab edge reinforcing bar has a V shape having the folded portion and portions extending from both ends of the folded portion. A steel beam support part reinforcing structure for a slab in which there are a plurality of slab edge reinforcing bars, and the folded portion of each slab edge reinforcing bar straddles each stud arranged in the longitudinal direction of the steel beam. 3. The slab steel beam support portion reinforcing structure according to claim 1, wherein the slab edge reinforcement has a meandering shape, and one folded portion of the meandering slab edge reinforcement has the steel frame. A steel beam support part reinforcing structure for a slab straddling each stud arranged in the longitudinal direction of the beam.

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