JP2024092161A - Stud and composite deck slabs - Google Patents

Abstract

[Problem] To improve the crack suppression function of a composite deck slab while suppressing the number of work steps and parts. [Solution] The composite deck slab is characterized by having an erected portion 31 attached to a support beam on which the deck plate of the composite deck slab is spanned, a forward extension portion 33 extending from the erected portion 31, a rearward extension portion 35 extending from the erected portion 31 toward the opposite side to the forward extension portion 33, and a downward extension portion 37 extending from the tip of the rearward extension portion 35 toward one end of the erected portion 31. [Selected Figure] Figure 1

Description

The present invention relates to studs and composite deck slabs.

In recent years, it has become known to provide studs on the flanges of beams in the design of the joints between the beams (support beams) and composite slabs (deck plates (corrugated steel plates) and concrete) of composite deck slabs. In the event of a fire, the joints between the beams and the composite slabs of composite deck slabs may collapse, so reinforcing the joints between the beams and the concrete of the composite deck slabs can improve the allowable performance of loads and spans, and improve fire resistance.

Composite deck slabs are formed by placing wire mesh or the like on the top surface of a deck plate that is connected to beams such as steel frames and pouring concrete on top of it, in order to resist live loads. It is also known to form a composite deck slab by integrating the beams and the concrete of the floor slab with headed studs provided on the flanges of the beams in order to improve fire resistance (see, for example, Patent Document 1).

JP 2022-110429 A

For example, FIG. 13A is a perspective view for explaining the configuration of a conventional composite deck slab 100. FIG. 13B is a schematic diagram showing a conventional composite deck slab 100 in a cracked state. In the composite deck slab 100, the studs 300 are simply formed in a cylindrical shape. A plurality of studs 300 are provided at predetermined intervals in the short direction W. When a load is applied to such a conventional composite deck slab 100, for example, cracks may occur around the beam B. In particular, cracks may occur on the peripheral surface of the concrete 20 along the short direction W, which is inconvenient from the standpoint of fire resistance.

In order to prevent cracks, the conventional composite deck slab 100 has multiple headed studs 300, and also has reinforcement bars (not shown) that control the direction of cracks around the beam B and prevent their expansion, thereby improving crack control. However, when constructing the conventional composite deck slab 100, it is necessary to install the studs 300 and then the reinforcement bars, which requires a lot of labor and parts, and there was a demand for improvements in workability.

The present invention was made in consideration of the above problems, and aims to provide a technology that can improve the crack suppression function of composite deck slabs while reducing the amount of work and the number of parts.

In order to solve the above problem, the stud of the present invention is characterized by having an erection portion that is attached so as to stand upright on a support beam across which the deck plate of a composite deck slab is spanned, a first extension portion extending from the erection portion, a second extension portion extending from the erection portion toward the side opposite the first extension portion, and a third extension portion extending from the tip of the second extension portion toward the side of one end of the erection portion that is attached to the support beam.

In one embodiment of the capture body according to the present invention, the second extension portion includes a pair of extension portions extending in different directions.

In one embodiment of the capture body according to the present invention, the pair of extension portions extend at an obtuse angle relative to the first extension portion.

In one aspect of the capture body according to the present invention, a fourth extension portion is provided between the second extension portion and the third extension portion, and extends from the second extension portion toward the one end of the erect portion.

In one aspect of the capture body according to the present invention, at least one of the third extension portion and the fourth extension portion is formed so as to protrude from the second extension portion on the side opposite the one end of the erect portion.

In one aspect of the capture body according to the present invention, the first extension portion and the second extension portion are provided at a position higher than the highest surface of the deck plate when the deck plate is in a spanning state.

Furthermore, in order to solve the above problem, the composite deck slab comprises at least a pair of support beams, a deck plate spanning the pair of support beams, concrete provided on the deck plate, and studs attached to the support beams and embedded in the concrete to engage with the concrete, the studs having an erection portion attached to the support beam so as to stand upright, a first extension portion extending from the erection portion, a second extension portion extending from the erection portion toward the side opposite the first extension portion, and a third extension portion extending from the tip of the second extension portion toward the side of one end of the erection portion attached to the support beam.

The present invention makes it possible to improve the crack suppression function of composite deck slabs while reducing the amount of work required and the number of components.

FIG. 2 is a perspective view for explaining the configuration of a composite deck slab according to the present embodiment. FIG. 2 is a perspective view of a deck plate used in the composite deck slab according to the present embodiment. 5A is a perspective view of the stud, FIG. 5B is a plan view of the stud, and FIG. 5C is a side view of the stud. FIG. 1 is a schematic diagram showing the extent to which concrete is restrained by studs in a conventional composite deck slab. 1 is a schematic diagram showing the extent to which concrete 20 is restrained by studs in a composite deck slab. 5A to 5C are diagrams illustrating the configuration of a stud according to Modification 1, where FIG. 5A is a perspective view of the stud, FIG. 5B is a plan view of the stud, and FIG. 5C is a side view of the stud. 1 is a schematic diagram showing the range of concrete restraint by studs in a composite deck slab according to variant example 1. 5A to 5C are diagrams for explaining the configuration of a stud in Modification 2, where (a) is a plan view of a stud 30B, (b) is a side view of the stud 30B, and (c) is a rear view of the stud 30B. 11A to 11C are diagrams illustrating the configuration of a stud according to Modification 3, where (a) is a plan view of the stud, (b) is a side view of the stud, and (c) is a rear view of the stud. 13 is a schematic diagram showing the range of concrete restraint by studs in a composite deck slab according to variant 3. 13A to 13C are diagrams illustrating the configuration of a stud according to Modification 4, where (a) is a plan view of the stud, (b) is a side view of the stud, and (c) is a rear view of a stud 30D. A schematic diagram showing the restraint range of concrete 20 by stud 30D relating to variant example 4 in a composite deck slab. FIG. 1 is a perspective view for explaining the configuration of a conventional composite deck slab 100. 1 is a schematic diagram showing a conventional composite deck slab 100 in a cracked state.

Below, an embodiment of the present invention will be described with reference to the drawings. Note that in the following description, the drawings are schematic, and it should be noted that the dimensional relationships and ratios of each element may differ from reality. There may also be parts in which the dimensional relationships and ratios of each element differ between the drawings.

<Synthetic deck slab>
1 is a perspective view for explaining the configuration of a composite deck slab 1 according to the present embodiment. The composite deck slab 1 according to the present invention includes at least a pair of support beams B, a deck plate 10 spanned between the pair of support beams B, concrete 20 provided on the deck plate 10, and a stud 30 attached to the support beam B and embedded in the concrete 20 to engage with the concrete 20. The stud 30 has a standing portion 31 attached to the support beam B so as to stand upright, a forward extension portion (first extension portion) 33 attached to the other end opposite to the one end of the standing portion 31 attached to the support beam B and extending in the longitudinal direction L of the deck plate 10, a rearward extension portion (second extension portion) 35 extending on the other end side of the standing portion 31 to the opposite side to the forward extension portion 33, and a downward extension portion (third extension portion) 37 extending from the tip of the rearward extension portion 35 toward the one end side of the standing portion 31. The configuration of the composite deck slab 1 in this embodiment will be specifically described below.

The composite deck slab 1 is a composite structure that includes, for example, a steel deck plate 10, concrete 20, and studs 30, and is used for ceilings or floors of buildings such as steel-framed buildings. In the composite deck slab 1, the deck plate 10 resists tensile forces, and the concrete 20 resists compressive forces. This allows the composite deck slab 1 to withstand large loads and span between H-shaped steel framed support beams B over long spans.

In the following, the direction in which the deck plate 10 is spanned between the support beams B of the building is referred to as the longitudinal direction (length direction) L of the deck plate 10, the direction in which the deck plate 10 extends intersecting the longitudinal direction L is referred to as the transverse direction (width direction) W, and the height direction of the deck plate 10 is referred to as the thickness direction D.

(Deck plate)
2 is a perspective view of the deck plate 10 used in the composite deck slab 1 according to the present embodiment. The deck plate 10 is a corrugated steel plate formed by roll forming or the like of a thin steel plate that has been subjected to a surface treatment such as zinc plating. The deck plate 10 does not have to be subjected to a surface treatment such as plating. The deck plate 10 has a peak portion 11, a valley bottom portion 13, and an inclined portion 15. The deck plate 10 has a wave shape in which the peak portion 11 and the valley bottom portion 13 each extending in the longitudinal direction L are continuous with each other in the lateral direction W via the inclined portion 15.

Each deck plate 10 is made up of two peaks 11, one valley bottom 13, and two pairs of inclined sections 15, and is formed in a wave shape in cross section along the short side direction W. Depending on the dimensions of the deck plate 10 in the short side direction W, only one peak 11 may be provided on one deck plate 10. When one deck plate 10 is connected to another deck plate 10 in the short side direction W, the connection between the deck plates 10 functions as a valley bottom 13. The deck plate 10 may also be end-closed at both ends in the longitudinal direction L.

The summit portion 11 is a flat portion located above the support beam B when the deck plate 10 is spanned between the support beams B (hereinafter also referred to as the "spanning state"), and is a plate-like portion extending in the longitudinal direction L. The summit portion 11 has a groove 12. The groove 12 is formed so as to be recessed toward the valley bottom portion 13. The groove 12 extends in the longitudinal direction L, and when there is only one groove 12, it is provided near the center in the lateral direction W.

The groove 12 in the peak portion 11 improves the strength of the peak portion 11. There is no need to form a single groove 12 in the peak portion 11, and multiple grooves 12 may be formed. Note that no groove 12 may be formed.

The valley bottom 13 is parallel or approximately parallel to the peak 11, and is a flat portion that is placed on the support beam B in the spanning state. The valley bottom 13 is a plate-like portion that extends in the longitudinal direction L. The valley bottom 13 does not overlap with the peak 11 in the lateral direction W. The groove 12 formed in the peak 11 may also be formed in the valley bottom 13.

The inclined portion 15 is a portion that connects the peak portion 11 and the valley bottom portion 13, and is a plate-shaped portion that extends in the longitudinal direction L. The inclined portion 15 extends obliquely from both ends of one peak portion 11 toward the valley bottom portion 13 in the lateral direction W. The inclined portion 15 is inclined to form a predetermined angle, for example an obtuse angle, with respect to the peak portion 11 and the valley bottom portion 13. The groove 12 formed in the peak portion 11 may be formed in the inclined portion 15.

A bulge 14 is formed at the transition between the valley bottom 13 and the inclined portion 15. The bulge 14 is a portion that protrudes to the opposite side of a pair of inclined portions 15 in one peak portion 11. In other words, the bulge 14 in a pair of inclined portions 15 facing each other across the valley bottom 13 are formed to face each other and bulge in directions approaching each other.

(concrete)
The concrete 20 is formed by solidifying concrete poured on the deck plate 10. For example, reinforcing bars (not shown) for preventing cracks, welded wire mesh 21 (see FIG. 1), etc. may be embedded inside the concrete 20. For ease of explanation, the surface of the concrete 20 facing the side opposite the support beam B is referred to as the main surface 22, and the surface extending in the thickness direction D and facing the longitudinal direction L is referred to as the side surface 23 (see FIG. 12B).

(stud)
3 is a diagram for explaining the configuration of the stud 30, where (a) is a perspective view of the stud 30, (b) is a plan view of the stud 30, and (c) is a side view of the stud 30. A plurality of studs 30 are provided at predetermined intervals along the extension direction (short direction W) of the support beam B. The studs 30 are provided, for example, at a position facing the valley bottom 13 of the deck plate 10 in the width direction W. The studs 30 are embedded in concrete poured from above the deck plate 10 at the support beam B, enhancing the sense of unity between the deck plate 10 and the concrete 20.

The stud 30 is formed from a metal material such as steel, and has an erected portion 31, a forward extension portion (first extension portion) 33, a rearward extension portion (second extension portion) 35, and a downward extension portion (third extension portion) 37. The erected portion 31 is formed in a cylindrical shape and is attached perpendicularly or approximately perpendicularly to the flange of the support beam B, for example, by welding. The erected portion 31 is erected on the flange of the support beam B so that it exceeds the peak portion (highest surface) 11 of the deck plate 10 when attached to the support beam B.

The erected portion 31 contributes to engagement with the concrete 20 on the support beam B. The erected portion 31 has a head 32 at one end. The head 32 is a portion having a larger diameter than the erected portion 31. Note that the erected portion 31 is not limited to a cylindrical shape, and may be formed in a rectangular column shape.

The forward extension 33 is integral with the standing portion 31 and is provided on the standing portion 31 on the head portion 32 side. When the standing portion 31 is attached to the support beam B, the forward extension 33 is located higher than the crest 11. The forward extension 33 extends from the standing portion 31 toward the deck plate 10. Specifically, the forward extension 33 extends to a position facing the valley bottom 13 of the deck plate 10. The forward extension 33 is formed so as to taper from the standing portion 31 toward the tip. The forward extension 33 contributes to engagement with the concrete 20 on the support beam B, and contributes to crack suppression and crack expansion on the main surface 22 of the concrete 20 around the support beam B.

The rear extension 35 is integral with the erected portion 31. The rear extension 35 is provided on the erected portion 31 at a position facing the forward extension 33 on the head 32 side. The forward extension 33 and the rear extension 35 extend, for example, linearly or approximately linearly in the longitudinal direction L. When the erected portion 31 is attached to the support beam B, the rear extension 35 is located higher than the crest 11. The rear extension 35 extends from the erected portion 31 toward the side opposite the deck plate 10 so as to be perpendicular or approximately perpendicular to the extension direction (width direction W) of the support beam B. The rear extension 35 extends to a degree not exceeding the support beam B. The rear extension 35 contributes to engagement with the concrete 20 on the support beam B and contributes to crack suppression and crack expansion on the main surface 22 of the concrete 20 around the support beam B.

The downward extension 37 is provided integrally with the rear extension 35. The downward extension 37 is provided at the tip of the rear extension 35 on the side opposite the standing portion 31. The downward extension 37 extends from the tip of the rear extension 35 to the side opposite the head 32 of the standing portion 31, that is, toward the support beam B when the stud 30 is attached to the support beam B. The downward extension 37 contributes to engagement with the concrete 20 on the support beam B, and also contributes to crack suppression and crack expansion on the side 23 of the concrete 20 around the support beam B.

<Characteristics of composite deck slabs>
The composite deck slab 1 described above is designed to collapse at the fulcrum position, which is the joint between the concrete 20 and the support beam B, in the event of a fire, for example, and the fulcrum position (joint position) is reinforced to improve the allowable performance of the load and span, and to improve the fire resistance. According to the present invention, a stud 30 is provided as a reinforcing means on the flange of the support beam B. A plurality of studs 30 are provided on the support beam B in a line in the short direction W.

Such studs 30 improve the pull-out strength of the ends of the composite deck slab 1, improving the degree of fixation to the support beam B and fire resistance, preventing cracks and suppressing the expansion of cracks at the ends of the composite deck slab 1, which is advantageous in terms of fire resistance, and can increase the allowable performance of the load and span, etc.

Figure 4 is a schematic diagram showing the range of restraint of concrete 20 by studs 300 in a conventional composite deck slab 100. In the conventional composite deck slab 100, the studs 300 are simply formed in a cylindrical shape. Therefore, it is assumed that the range of restraint of concrete 20 by the studs 300 (the range indicated by diagonal lines) does not fully reach the main surface 22 and side surface 23 of concrete 20. When a load is applied to such a conventional composite deck slab 100, cracks may occur around the support beam B, that is, on the main surface 22 and side surface 23 of concrete 20 (see Figure 13).

Figure 5 is a schematic diagram showing the range of restraint of concrete 20 by studs 30 in a composite deck slab 1. The studs 30 are attached to the support beam B so that the erected portion 31 is located in the center or approximately in the center in the width direction of the support beam B (the longitudinal direction L in the figure).

In the composite deck slab 1 according to this embodiment, the stud 30 has a rear extension 35 and a downward extension 37. The rear extension 35 extends from the erected portion 31 toward the side surface 23 of the concrete 20, and the downward extension 37 extends along the side surface 23 in the thickness direction D, improving the unity with the concrete 20 and dispersing the stress generated around the stud 30. This allows the end of the composite deck slab 1 to be reinforced, and improved fire resistance can be expected. Furthermore, the rear extension 35 and the downward extension 37 allow the restraint range of the concrete 20 by the stud 30 to reach the vicinity of the side surface 23 of the concrete 20. The stud 30 can suppress cracking of the concrete 20 near the support beam B by simply installing the stud 30 without providing a separate reinforcing bar. Note that a separate reinforcing bar may be provided around the support beam B, that is, around the stud 30.

<Stud according to modified example 1>
Furthermore, in the present invention, the stud may have multiple rearward extending portions. A stud 30A according to Modification 1 will be described below. Figure 6 is a diagram for explaining the configuration of the stud 30A according to Modification 1, where (a) is a perspective view of the stud 30A, (b) is a plan view of the stud 30A, and (c) is a side view of the stud 30A. Note that the same components as those of the stud 30 are given the same reference numerals, and descriptions thereof may be omitted.

The stud 30A has an upright portion 31, a forward extension portion (first extension portion) 33, two rearward extension portions (second extension portions) 35A, and a downward extension portion (third extension portion) 37.

The two rear extensions 35A are integral with the standing portion 31. The rear extensions 35A are provided on the side of the standing portion 31 opposite the front extensions 33 on the head 32 side, and extend opposite the front extensions 33. The rear extensions 35A have the same or approximately the same length as the front extensions 33.

The forward extension 33 and each rear extension 35A extend at an obtuse angle θ1, and the rear extensions 35A also extend at an obtuse angle θ2. For example, the obtuse angle θ1 formed by a straight line along the extension direction of the forward extension 33 and a straight line along the extension direction of the rear extension 35A is preferably 90° to 120°, and the obtuse angle θ2 formed by the straight lines along the extension directions of the two rear extensions 35A is preferably 120° to 180°.

The downward extension 37 is provided integrally with each rear extension 35A. The downward extension 37 is provided at the tip of each rear extension 35A on the side opposite the standing portion 31. The downward extension 37 is formed at the tip of the rear extension 35A on the side opposite the head 32 of the standing portion 31, that is, so as to extend toward the support beam B when the stud 30 is attached to the support beam B.

Figure 7 is a schematic diagram showing the restraint range of concrete 20 by stud 30A in modified example 1 in composite deck slab 1. When stud 30A is installed on support beam B at the center or approximately the center of valley bottom 13 of deck plate 10 in the short direction W, rear extension 35A overlaps peak 11 in the short direction W when viewed in longitudinal direction L. In addition, downward extension 37 extends toward support beam B relative to deck plate 10.

The stud 30A according to the first modification has at least the same effect as the stud 30, and has a pair (two) of rearward extensions 35A extending in different directions, so that the range of restraint of the concrete 20 by the stud 30A can be expanded. Furthermore, the two rearward extensions 35A extend at an obtuse angle to each other, so that they approach the rearward extension 35A of the stud 30A adjacent to each other in the short direction W. This makes it possible to make the interval between the restraint ranges of the concrete 20 by the two adjacent studs 30A closer or more continuous, and the pair of rearward extensions 35A and the downward extension 37 can suppress cracks on the main surface 22 and side surface 23 of the concrete 20 over a wide area near the support beam B.

<Stud according to modified example 2>
Next, a stud 30B according to Modification 2 will be described. Figure 8 is a diagram for explaining the configuration of the stud 30B according to Modification 2, where (a) is a plan view of the stud 30B, (b) is a side view of the stud 30B, and (c) is a rear view of the stud 30B. Note that the same reference numerals are used for the same configuration as the studs 30 and 30A, and descriptions thereof may be omitted.

The stud 30B has an upright portion 31, a forward extension portion (first extension portion) 33, two rearward extension portions (second extension portions) 35A, and a downward extension portion (third extension portion) 37B.

The downward extension portion 37B is provided integrally with each rear extension portion 35A. The downward extension portion 37B is provided at the tip of each rear extension portion 35A on the side opposite the standing portion 31. The downward extension portion 37B is formed at the tip of the rear extension portion 35A so as to extend toward the side opposite the head 32 of the standing portion 31, i.e., toward the support beam B, and is formed so as to protrude from the rear extension portion 35A on the side opposite the support beam B, i.e., toward the head 32 side of the standing portion 31.

The stud 30B according to the second modification has at least the same effect as the stud 30A, and because the downward extension 37B protrudes toward the head 32 of the erected portion 31 relative to the rear extension 35A, the range of restraint of the concrete 20 by the stud 30B can be expanded. This allows the spacing of the restraint range of the concrete 20 by the two adjacent studs 30B to be closer, and furthermore, because the downward extension 37 protrudes toward the main surface 22 relative to the rear extension 33A, cracks in the concrete 20, especially on the side surface 23, can be suppressed over a wide range in the thickness direction D.

<Stud according to modified example 3>
Next, a stud 30C according to Modification 3 will be described. Figure 9 is a diagram for explaining the configuration of the stud 30C according to Modification 3, where (a) is a plan view of the stud 30C, (b) is a side view of the stud 30C, and (c) is a rear view of the stud 30C. Note that the same reference numerals are used for the same configuration as the studs 30 and 30A, and descriptions thereof may be omitted.

The stud 30C has an upright portion 31, a forward extension portion (first extension portion) 33, two rearward extension portions (second extension portions) 35A, a first downward extension portion (third extension portion) 37, and a second downward extension portion (fourth extension portion) 39C.

The second downward extension portion 39C is provided on the rear extension portion 35A between the standing portion 31 and the first downward extension portion 37, and is formed so as to extend toward the side opposite the head portion 32 of the standing portion 31, i.e., toward the support beam B.

Figure 10 is a schematic diagram showing the restraint range of concrete 20 by studs according to variant 3 in a composite deck slab 1. Stud 30C according to variant 3 has at least the same effect as stud 30A, and since multiple downward extensions 37B, 39C are provided for one rear extension 35A, the interval between the restraint ranges of concrete 20 by two adjacent studs 30C can be continuously formed. This makes it possible to suppress cracks on the side surface 23 of concrete 20 over a wide area near support beam B.

<Stud according to modification example 4>
The following describes the stud 30D according to Modification 4. Figure 11 is a diagram for explaining the configuration of the stud 30D according to Modification 4, where (a) is a plan view of the stud 30D, (b) is a side view of the stud 30D, and (c) is a rear view of the stud 30D. Note that the same components as those of the stud 30 are given the same reference numerals, and descriptions thereof may be omitted.

The stud 30D has an upright portion 31, a forward extension portion (first extension portion) 33, two rearward extension portions (second extension portions) 35D, and a downward extension portion (third extension portion) 37.

The two rear extensions 35D are integral with the standing portion 31. The rear extensions 35D are provided on the side of the standing portion 31 opposite the front extensions 33 on the head 32 side, and extend opposite the front extensions 33. The rear extensions 35D are formed shorter than the front extensions 33.

Figure 12 is a schematic diagram showing the range of restraint of concrete 20 by stud 30D according to variant 4 in a composite deck slab. Stud 30D according to variant 4 has at least the same effect as stud 30, and has a pair (two) of rear extensions 35D that extend in different directions, so the range of restraint of concrete 20 by stud 30D can be expanded compared to conventional stud 300.

The forward extension 33 and each rear extension 35D extend at an obtuse angle θ3, and the rear extensions 35D also extend at an obtuse angle θ4. For example, the obtuse angle θ3 between a straight line along the extension direction of the forward extension 33 and a straight line along the extension direction of the rear extension 35D is preferably 120° to 180°, and the angle θ4 between the straight lines along the extension directions of the two rear extensions 35D is preferably 5° to 180°. The angle between the two rear extensions 35D is smaller than the angle between the two rear extensions 35A in the first modification.

The stud 30D according to the fourth modification has at least the same effect as the stud 30, and in the rear extension 35D, the distance between the erected portion 31 and the downward extension 37 is shorter than in the first modification, and the distance from the downward extension 37 to the side surface 23 is shorter. Therefore, in the fourth modification, the stud 30D can secure a dense restraining range for the main surface 22 and the side surface 23 of the concrete 20, which contributes to the suppression and expansion of cracks on the main surface 22 and the side surface 23 of the concrete 20.

＜Other＞
Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and includes all aspects included in the concept of the present invention and the scope of the claims. In addition, each configuration may be appropriately selected and combined so as to achieve at least a part of the above-mentioned problems and effects. In addition, for example, the shape, material, arrangement, size, etc. of each component in the above embodiment may be appropriately changed depending on the specific use mode of the present invention. For example, the configurations in Modifications 1 to 3 may be applied to the standing portion 31.

In addition, in the above studs 30, 30A, 30B, 30C, and 30D, the erected portion 31 and the forward extending portion 33 are formed integrally, but may be formed separately and detachable from each other. In this case, the forward extending portion 33 may be a flexible steel wire or the like, and may be wound around the erected portion 31.

1: Composite deck slab 10: Deck plate 20: Concrete 30, 30A, 30B, 30C, 30D: Stud, 31: Standing portion, 33: Front extension portion (first extension portion), 35, 35A: Rear extension portion (second extension portion), 37, 37B: Downward extension portion (third extension portion), 39C: Second downward extension portion (fourth extension portion)

Claims (7)

An erection portion that is attached to stand upright on a support beam over which a deck plate of a composite deck slab is spanned;
a first extending portion extending from the standing portion;
a second extending portion extending from the standing portion toward a side opposite to the first extending portion;
a third extension portion extending from a tip of the second extension portion toward one end of the standing portion attached to the support beam;
1. A stud for engaging concrete in a composite deck slab comprising: The stud according to claim 1, characterized in that the second extension portion includes a pair of extension portions extending in different directions. The stud according to claim 2, characterized in that the pair of extensions extend at an obtuse angle to the first extension. The stud according to claim 1 or 2, characterized in that it has a fourth extension portion extending from the second extension portion toward the one end of the erected portion between the second extension portion and the third extension portion. The stud according to claim 4, characterized in that at least one of the third extension portion and the fourth extension portion is formed to protrude from the second extension portion on the side opposite the one end of the erected portion. The stud according to claim 1, characterized in that the first extension and the second extension are provided at a higher position than the deck plate when the deck plate is in a spanning state. At least one pair of support beams;
A deck plate spanning the pair of support beams;
Concrete provided on the deck plate;
a stud attached to the support beam and embedded in and engaging the concrete;
Equipped with
The stud has an upright portion attached to the support beam so as to stand upright thereon;
a first extension portion extending from the erected portion, a second extension portion extending from the erected portion toward a side opposite to the first extension portion, and a third extension portion extending from a tip of the second extension portion toward one end of the erected portion attached to the support beam;
A composite deck slab comprising:

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