JP7187754B2 - RC floor slab formation method - Google Patents

Description

The present invention relates to a RC floor slab forming method. More specifically, it relates to a floor slab (RC floor slab) using reinforced concrete.

Conventionally, a concrete floor slab formed by placing concrete on a deck plate is known (see, for example, Patent Document 1).

This concrete floor slab is constructed so that the deck plate does not drop off from the concrete layer by pouring concrete onto the deck plate having anchor metal fittings attached to the ends thereof.

Further, a concrete floor slab formed by placing concrete on a flat deck plate is known (see, for example, Patent Document 2).

This concrete floor slab is constructed so that the flat deck plate does not drop off from the concrete floor slab by pouring concrete onto the flat deck plate to which the anchor member is fixed.

JP-A-11-159042 Japanese Utility Model Laid-Open No. 60-68111

However, in these concrete floor slabs, when an impact load is applied, although the deck plate can be prevented from falling off from the concrete floor slab, it is conceivable that the deck plate will come off the beam.

In this case, for example, pieces of concrete broken by impact load may fall below the concrete floor slab.

For this reason, it becomes necessary to cover the surface of the concrete floor slab with a lining board as a countermeasure against falling objects on the concrete floor slab, which affects the construction period.

Specifically explaining the reasons for the impact on the construction period, firstly, it takes time to lay the lining board, which increases the construction period. Secondly, when the lining board is removed as the construction of the upper floor progresses, the height of the heavy equipment for removal is limited, and heavy equipment with small capacity has to be used. For this reason, it takes time to remove the lining board, increasing the construction period.

In addition to an increase in cost due to an increase in the construction period, the lining plate itself is costly. This increases costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide an RC floor slab forming method capable of suppressing falling of concrete fragments even if the concrete floor slab of the RC floor slab is destroyed by an impact load.

The first mode is a RC floor slab forming method in which a deck plate is spanned over horizontal members that constitute a structure, the ends of the deck plate are joined to the horizontal members, and concrete is placed on the upper surface of the deck plate. is.

In the first mode, a deck plate is laid across horizontal members that constitute a structure, and the ends of the deck plate are joined to the horizontal members. Then, concrete is placed on the upper surface of the deck plate to form slab concrete.

In the RC floor slab thus formed, when an impact load is applied to the upper surface of the RC floor slab by a falling object, the edge of the deck plate is joined to a horizontal member so that the deck plate can bear the impact load. there is Therefore, the deck plate exerts impact energy absorbing ability.

In addition, when the RC floor slab is destroyed by the impact load, there is a possibility that concrete fragments separated from the reinforcing bars may fall below the RC floor slab. However, in this aspect, the deck plate is joined to the horizontal member. Therefore, by receiving concrete fragments with the deck plate, it is possible to prevent them from falling below the RC floor slab.

In the second mode, a deck plate is spanned over horizontal members that constitute a structure, and when concrete is placed on the upper surface of the deck plate, the end of the deck plate is embedded in the concrete above the horizontal member. It is an RC floor slab forming method that allows

In the second mode, a deck plate is laid across the horizontal members that constitute the structure, and concrete is placed on the upper surface of this deck plate. At this time, slab concrete is formed by embedding the ends of the deck plate in concrete above the horizontal member.

In the RC floor slab thus formed, when an impact load acts on the upper surface of the RC floor slab due to falling objects, etc., the ends of the deck plate are placed on the slab above the horizontal members so that the deck plate can bear the impact load. Bonded to concrete. As a result, the deck plate is supported by the beams via the slab concrete, so that the deck plate exhibits impact energy absorption capability.

In addition, when the slab concrete is destroyed by the impact load, there is a possibility that fragments separated from the reinforcing bars will drop below the RC floor slab. However, in this embodiment, the deck plate is joined to the slab concrete above the horizontal member and supported by the horizontal member. Therefore, by receiving the fragments with the deck plate, it is possible to prevent them from falling below the RC floor slab.

In a third aspect, a deck plate is spanned over horizontal members that constitute a structure, and a holding portion that connects the deck plate to the horizontal member connects the end portion of the deck plate and the horizontal member, and the deck plate It is an RC floor slab forming method for placing concrete on the upper surface of.

In the third mode, a deck plate is laid over horizontal members that constitute a structure, and the ends of the deck plate and the horizontal members are connected by holding portions that connect the deck plate to the horizontal members. Then, concrete is placed on the upper surface of the deck plate to form slab concrete.

In the RC floor slab thus formed, when an impact load is applied to the upper surface of the RC floor slab by a falling object or the like, and the edge of the deck plate comes off the horizontal member, the deck plate is connected to the horizontal member via the holding part. ing.

Therefore, even if the impact load breaks the slab concrete and separates the fragments from the reinforcing bars, the deck plate is connected to the horizontal member, so the fragments can be received by the deck plate and prevented from falling below the RC floor slab. can.

According to this aspect, even if the concrete of the RC floor slab is destroyed by the impact load, the falling of the fragments can be suppressed.

It is a perspective view showing a deck plate according to the first embodiment. It is a sectional view showing the important section of a 1st embodiment. It is a sectional view showing the important section of a 2nd embodiment. It is a sectional view showing the important section of a 3rd embodiment. It is a sectional view showing the important section of a 4th embodiment. It is a perspective view which shows the principal part of 5th Embodiment. It is a perspective view which shows the principal part of 6th Embodiment. FIG. 21 is a perspective view showing a main part of a seventh embodiment; FIG. 9 is a cross-sectional view taken along line AA of FIG. 8; FIG. 22 is a cross-sectional view showing the main part of the eighth embodiment; FIG. 22 is a cross-sectional view showing the main part of the ninth embodiment; FIG. 22 is a cross-sectional view showing the essential parts of the tenth embodiment; FIG. 22 is a cross-sectional view showing the main part of the eleventh embodiment; FIG. 22 is a cross-sectional view showing the essential parts of the twelfth embodiment; FIG. 32 is a cross-sectional view showing the main part of the thirteenth embodiment; FIG. 22 is a cross-sectional view showing the main part of the fourteenth embodiment; FIG. 22 is a cross-sectional view showing the main part of the fifteenth embodiment; FIG. 32 is a cross-sectional view showing the essential part of the sixteenth embodiment; FIG. 22 is a cross-sectional view showing the essential parts of the seventeenth embodiment; FIG. 22 is a cross-sectional view showing the main part of the eighteenth embodiment;

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are diagrams showing an RC floor slab 10 according to this embodiment. This RC floor slab 10 constitutes, for example, a structural floor made of reinforced concrete, and examples thereof include slab floor slabs for buildings, civil engineering structures, overpasses, concourses, and the like.

As shown in FIG. 1, the RC floor slab 10 includes a deck plate 14 spanned over beams 12, which are examples of horizontal members that constitute a structure. The beam 12 over which the deck plate 14 is spanned is made of H-shaped steel, for example, and a stud bolt 16 is erected on a flange 12B provided at the upper end of the H-shaped steel web 12A, as shown in FIG. It is

As the deck plate 14, a flat deck with a flat upper surface is used as an example, but the deck plate 14 is not limited to this. For example, a deck plate having an uneven upper surface may be used. For example, a deck plate having an uneven upper surface or a deck plate having a corrugated cross section may be used.

As shown in FIG. 1, the deck plates 14 are formed in an elongated shape, and a plurality of deck plates 14 are arranged side by side to form a flat portion between the beams 12 . Reinforcing bars are arranged on this flat portion and concrete is cast to form a concrete slab 18 as shown in FIG. This deck plate 14 is not removed even after the slab concrete 18 is formed, and becomes a so-called discard formwork.

The deck plate 14 includes a flat plate portion 14A forming an upper surface and reinforcing ribs 14B projecting from the lower surface of the flat plate portion 14A. 20. The flange portion 20 is joined to the flange 12B of the beam 12 by a first joining means 22. As shown in FIG. As a result, the ends of the deck plate 14 are joined to the beams 12 so that the deck plate 14 bears the impact load when the impact load acts on the upper surface 18A of the slab concrete 18 .

As the first joining means 22 for joining the flange portion 20 of the deck plate 14 to the flange 12B of the beam 12, there is a welding portion that joins the flange portion 20 of the deck plate 14 and the flange 12B of the beam 12 by welding.

The first joining means 22 is not limited to a welded portion, and other examples include a bonded portion bonded with an adhesive, a bonded portion bonded with double-sided tape, a magnetically attached portion using a magnet, a bolt The fastening part by

In addition, the opposing portions of the flange portion 20 of the deck plate 14 and the flange portion 12B of the beam 12 are subjected to rusting, shot blasting, etc. to increase friction, or to be roughened with chemicals to prevent the deck plate 14 and the beam 12 from becoming relative to each other. Movement can be suppressed.

When forming this RC floor slab 10, a deck plate 14 is laid over beams 12, which are horizontal members constituting the structure. Next, the flange portion 20 at the end of the deck plate 14 is joined to the flange 12B of the beam 12 by the first joining means 22 . Then, concrete is placed on the upper surface of the deck plate 14 to form a slab concrete 18 to form the RC floor slab 10 .

(Action)
Next, the operation of this embodiment will be described.

For example, when an impact load acts on the upper surface 18A of the slab concrete 18 due to a dropped object such as a lifted object or a conveyed object during lifting work, the end of the deck plate 14 is positioned so that the deck plate 14 can bear the impact load. It is joined to the beam 12 by 1 joining means 22 . Therefore, the deck plate 14 exhibits impact energy absorption capability.

Note that the falling objects are not limited to these. For example, when constructing the floor slabs of a parking lot, the object of falling objects is a car, and when constructing the floor slabs of a factory, the object of falling objects is an object to be transported.

Moreover, when the slab concrete 18 is destroyed by the impact load, there is a possibility that the fragments separated from the reinforcing bars forming the slab concrete 18 may drop below the RC floor slab 10 . However, in this embodiment, the deck plate 14 is joined to the beam 12 by the first joining means 22 . Therefore, the debris can be received by the deck plate 14, and the falling of the debris below the RC floor slab 10 can be suppressed. In addition, it is also possible to prevent falling objects that have fallen on the RC floor slab 10 from falling below the RC floor slab 10 .

Therefore, as a countermeasure against falling objects, compared to the conventional structure in which the RC floor slab 10 is covered with a lining plate, the construction work can be reduced, and the construction period can be shortened.

(Second embodiment)
FIG. 3 is a diagram showing an RC floor slab 10 according to the second embodiment. Parts that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals and descriptions thereof are omitted, and only different parts are described. . The method of forming the RC floor slab 10 is the same as in the first embodiment.

In this embodiment, the joint structure of the deck plate 14 to the beam 12 is different from that of the first embodiment.

The flange portion 20 of the deck plate 14 is formed with a folded portion 30 that constitutes the first joining means. The folded portion 30 includes a bent portion 30A bent downward along the flange 12B of the beam 12 located on the opposite side of the deck plate 14, and a bent portion 30B bent from the bent portion 30A toward the web 12A. there is

Even with such a structure, the ends of the deck plate 14 can be joined to the beams 12, which are horizontal members, so that the same effects as in the first embodiment can be obtained.

(Third embodiment)
FIG. 4 is a diagram showing an RC floor slab 10 according to the third embodiment. Parts that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals and descriptions thereof are omitted, and only different parts are described. . The method of forming the RC floor slab 10 is the same as in the first embodiment.

In this embodiment, the joint structure of the deck plate 14 to the beam 12 is different from that of the first embodiment.

A plate-shaped fixing member 32 is fixed to the flange portion 20 of the deck plate 14 with an adhesive 34 . The fixing member 32 includes a long piece 32A fixed to the flange portion 20, a bent portion 32B bent downward along the flange 12B of the beam 12 from the tip of the long piece 32A, and bent toward the web 12A from the bent portion 32B. and a curved portion 32C. The bent portion 32C is fixed to the flange 12B of the beam 12 with an adhesive 34. As shown in FIG.

Even with such a structure, the ends of the deck plate 14 can be joined to the beams 12, which are horizontal members, so that the same effects as in the first embodiment can be obtained.

(Fourth embodiment)
FIG. 5 is a diagram showing the RC floor slab 10 according to the fourth embodiment. Parts that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals and explanations thereof are omitted, and only different parts will be explained. .

The deck plate 14 of this embodiment is provided with a projection 36 at the portion of the flange portion 20 supported by the beam 12 , and the projection 36 is embedded in the slab concrete 18 above the beam 12 . For this reason, the flange portion 20, which is the end portion of the deck plate 14, is joined to the slab concrete 18 on the beam 12, which is a horizontal member, so that the deck plate 14 is configured not to shift from the slab concrete 18. .

As a result, when an impact load acts on the upper surface 18A of the slab concrete 18, the end of the deck plate 14 is joined to the slab concrete 18 on the beam 12, which is a horizontal member, so that the deck plate 14 bears the impact load. A second joining means is provided.

Further, in this embodiment, a stud bolt 16 is erected on the flange 12B of the upper portion of the beam 12, and the stud bolt 16 is embedded in the slab concrete 18. As shown in FIG. Therefore, relative movement of the slab concrete 18 from the beam 12 is suppressed.

When forming this RC floor slab 10, a deck plate 14 is laid over beams 12, which are horizontal members constituting the structure. Next, concrete is placed on the upper surface of the deck plate 14 to form a concrete slab 18 . At this time, the ends of the deck plate 14 are joined to the slab concrete 18 on the beams 12 via the projections 36 to form the RC floor slab 10 .

(Action)
Next, the operation of this embodiment will be described.

When an impact load acts on the upper surface 18A of the slab concrete 18 due to a dropped object such as a lifted object or a transported object during lifting work, the end of the deck plate 14 is supported by the projection 36 so that the deck plate 14 bears the impact load. It is joined to the slab concrete 18 on the beam 12 . As a result, the deck plate 14 is supported by the beams 12 via the slab concrete 18, so that the deck plate 14 can absorb impact energy.

Moreover, when the slab concrete 18 is destroyed by the impact load, there is a possibility that the fragments separated from the reinforcing bars will drop below the RC floor slab 10 . However, in this embodiment, the deck plate 14 is joined to the slab concrete 18 on the beams 12 and supported by the beams 12 via the slab concrete 18 . Therefore, by receiving the fragments with the deck plate 14 , it is possible to prevent them from falling downward on the RC floor slab 10 .

Therefore, as a countermeasure against falling objects, compared to the conventional structure in which the RC floor slab 10 is covered with a lining plate, the construction work can be reduced, and the construction period can be shortened.

(Fifth embodiment)
FIG. 6 is a diagram showing an RC floor slab 10 according to the fifth embodiment. Parts that are the same as or equivalent to those of the fourth embodiment are denoted by the same reference numerals, and descriptions thereof are omitted, and only different parts are described. . The method of forming the RC floor slab 10 is the same as in the fourth embodiment.

In this embodiment, the joining structure between the slab concrete 18 (see FIG. 5 and the like) and the deck plate 14 is different from that of the fourth embodiment.

A plurality of rectangular openings 38 are formed in the flange portion 20 of the deck plate 14 . A cut-and-raised piece 40 is erected at the opening edge of each opening 38 located on the flange portion 20 side (not shown) opposite to the flange portion 20 where the opening portion 38 is provided. is formed by cutting and raising a portion forming the opening 38 . The cut-and-raised piece 40 is an example of an upright wall.

The cut-and-raised pieces 40 are arranged in rows in the width direction of the deck plate 14 , and these rows are formed in two rows in the length direction of the deck plate 14 . The cut-and-raised pieces 40 in each row are arranged alternately in the width direction of the deck plate 14 .

Each cut-and-raised piece 40 is embedded in the slab concrete 18 while being arranged on the flange 12B of the beam 12 (see FIG. 5, etc.). As a result, when an impact load acts on the upper surface 18A of the slab concrete 18, the end of the deck plate 14 is joined to the slab concrete 18 on the beam 12, which is a horizontal member, so that the deck plate 14 bears the impact load. A second joining means is provided.

Even with such a structure, the ends of the deck plate 14 can be joined to the slab concrete 18 on the beams 12, so that the same effects as in the fourth embodiment can be obtained.

(Sixth embodiment)
FIG. 7 is a diagram showing an RC floor slab 10 according to the sixth embodiment. Parts that are the same as or equivalent to those of the fifth embodiment are denoted by the same reference numerals and explanations thereof are omitted, and only different parts will be explained. . The method of forming the RC floor slab 10 is the same as that of the fifth embodiment.

In this embodiment, the arrangement of the cut-and-raised pieces 40 provided on the flange portion 20 of the deck plate 14 is different from that of the fifth embodiment.

That is, the cut-and-raised piece 40 stands up from the opening edge of the opening 38 located on the distal end side of the flange portion 20 .

Even with such a structure, the ends of the deck plate 14 can be joined to the slab concrete 18 on the beams 12, so that the same effects as in the fourth embodiment can be obtained.

The cut-and-raised piece 40 stands up from the opening edge of the opening 38 located on the distal end side of the flange portion 20 . Therefore, the falling direction of the cut-and-raised piece 40 when the deck plate 14 slides away from the beam 12 can be the cut-and-raised direction.

Therefore, when the deck plate 14 slides away from the beam 12, the falling direction of the cut-and-raised piece 40 is opposite to the cut-and-raised direction. can be done. Thereby, the separation prevention effect of the deck plate 14 from the beam 12 can be enhanced.

(Seventh embodiment)
8 and 9 are diagrams showing an RC floor slab 10 according to the seventh embodiment. Parts that are the same as or equivalent to those of the sixth embodiment are denoted by the same reference numerals and description thereof is omitted. only explained. The method of forming the RC floor slab 10 is the same as in the sixth embodiment.

That is, a hole 42 is formed in one of the cut-and-raised pieces 40 provided on the flange portion 20 of the deck plate 14 , and a reinforcing bar 44 forming the slab concrete 18 is passed through the hole 42 . An insertion hole 46 is formed in a portion of the flange portion 20 near the cut-and-raised piece 40, and a stud bolt 16 provided on the flange 12B of the beam 12 is inserted through the insertion hole 46. Hole 42 is an example of a through hole.

The cut-and-raised piece 40 is embedded in the slab concrete 18 while being placed on the beam 12 . As a result, when an impact load acts on the upper surface 18A of the slab concrete 18, the end of the deck plate 14 is joined to the slab concrete 18 on the beam 12, which is a horizontal member, so that the deck plate 14 bears the impact load. A second joining means is provided.

Even with such a structure, the ends of the deck plate 14 can be joined to the slab concrete 18 on the beams 12, so the same effects as in the sixth embodiment can be obtained.

Further, by passing the reinforcing bars 44 through the holes 42 of the cut-and-raised pieces 40, the joint strength between the slab concrete 18 and the deck plate 14 can be increased. In addition, even if the engagement margin of the deck plate 14 is lost, the deck plate 14 can be hooked to the reinforcement 44 to prevent the deck plate 14 from coming off by making the engagement margin of the reinforcing bar 44 with the beam 12 long.

In this embodiment, a hole 42 is provided in one of the cut-and-raised pieces 40 provided in the flange portion 20 of the deck plate 14, and a reinforcing bar 44 arranged in the slab concrete 18 is passed through the hole 42. was described as an example, but it is not limited to this. In other words, the penetration of the reinforcing bar 44 into the cut-and-raised piece 40 is arbitrary.

(Eighth embodiment)
FIG. 10 is a diagram showing an RC floor slab 10 according to the eighth embodiment. Parts that are the same as or equivalent to those of the fourth embodiment are denoted by the same reference numerals and explanations thereof are omitted, and only different parts will be explained. . The method of forming the RC floor slab 10 is the same as in the fourth embodiment.

This embodiment differs from the fourth embodiment in the joint structure between the concrete slab 18 and the deck plate 14 .

The flange portion 20 of the deck plate 14 is provided with a plurality of bent portions 48 extending in the width direction at intervals in the length direction. The bent portion 48 is formed by bending a portion of the flange portion 20 into a mountain shape and protrudes upward.

Each bent portion 48 is embedded in the slab concrete 18 while being placed on the beam 12 . As a result, when an impact load acts on the upper surface 18A of the slab concrete 18, the end of the deck plate 14 is joined to the slab concrete 18 on the beam 12, which is a horizontal member, so that the deck plate 14 bears the impact load. A second joining means is provided.

Even with such a structure, the ends of the deck plate 14 can be joined to the slab concrete 18 on the beams 12, so that the same effects as in the fourth embodiment can be obtained.

(Ninth embodiment)
FIG. 11 is a diagram showing an RC floor slab 10 according to the ninth embodiment. Parts that are the same as or equivalent to those of the fourth embodiment are denoted by the same reference numerals and explanations thereof are omitted, and only different parts will be explained. . The method of forming the RC floor slab 10 is the same as in the fourth embodiment.

This embodiment differs from the fourth embodiment in the joint structure between the concrete slab 18 and the deck plate 14 .

A plurality of rivets 50 are provided on the flange portion 20 of the deck plate 14, and each rivet 50 protrudes upward.

Each rivet 50 is embedded in the slab concrete 18 while being placed on the beam 12 . As a result, when an impact load acts on the upper surface 18A of the slab concrete 18, the end of the deck plate 14 is joined to the slab concrete 18 on the beam 12, which is a horizontal member, so that the deck plate 14 bears the impact load. A second joining means is provided.

Even with such a structure, the ends of the deck plate 14 can be joined to the slab concrete 18 on the beams 12, so that the same effects as in the fourth embodiment can be obtained.

(Tenth embodiment)
FIG. 12 is a diagram showing an RC floor slab 10 according to the tenth embodiment. Parts that are the same as or equivalent to those of the fourth embodiment are denoted by the same reference numerals and descriptions thereof are omitted, and only different parts are described. . The method of forming the RC floor slab 10 is the same as in the fourth embodiment.

This embodiment differs from the fourth embodiment in the joint structure between the concrete slab 18 and the deck plate 14 .

The deck plate 14 has an end bent portion 52 formed at the end of the flange portion 20 . The bent end portion 52 includes a standing portion 52A standing upward from the end portion of the flange portion 20, and an extending piece 52B extending obliquely downward from the tip of the standing portion 52A toward the tip side. .

The bent end portion 52 is embedded in the slab concrete 18 while being placed on the beam 12 . As a result, when an impact load acts on the upper surface 18A of the slab concrete 18, the end of the deck plate 14 is joined to the slab concrete 18 on the beam 12, which is a horizontal member, so that the deck plate 14 bears the impact load. A second joining means is provided.

Even with such a structure, the ends of the deck plate 14 can be joined to the slab concrete 18 on the beams 12, so that the same effects as in the fourth embodiment can be obtained.

(Eleventh embodiment)
FIG. 13 is a diagram showing an RC floor slab 10 according to the eleventh embodiment. Parts that are the same as or equivalent to those of the fourth embodiment are denoted by the same reference numerals and explanations thereof are omitted, and only different parts will be explained. . The method of forming the RC floor slab 10 is the same as in the fourth embodiment.

This embodiment differs from the fourth embodiment in the joint structure between the concrete slab 18 and the deck plate 14 .

The deck plate 14 is provided with a standing wall 54 formed by standing the end of the flange portion 20 upward. A through hole 56 is formed in the upright wall 54 , and the lower reinforcing bar 44 forming the slab concrete 18 penetrates through the through hole 56 .

The standing wall 54 is embedded in the slab concrete 18 while being placed on the beam 12 . As a result, when an impact load acts on the upper surface 18A of the slab concrete 18, the end of the deck plate 14 is joined to the slab concrete 18 on the beam 12, which is a horizontal member, so that the deck plate 14 bears the impact load. A second joining means is provided.

Even with such a structure, the ends of the deck plate 14 can be joined to the slab concrete 18 on the beams 12, so that the same effects as in the fourth embodiment can be obtained.

Further, the upright wall 54 provided in the flange portion 20 is penetrated by the reinforcing bar 44 at the lower end of the slab concrete 18 . Therefore, since the deck plate 14 is supported by the reinforcing bars 44 of the slab concrete 18, the separation prevention effect of the deck plate 14 can be enhanced.

(12th embodiment)
FIG. 14 is a diagram showing an RC floor slab 10 according to the twelfth embodiment. Parts that are the same as or equivalent to those of the fourth embodiment are denoted by the same reference numerals and explanations thereof are omitted, and only different parts will be explained. . The method of forming the RC floor slab 10 is the same as in the fourth embodiment.

This embodiment differs from the fourth embodiment in the joint structure between the concrete slab 18 and the deck plate 14 .

A joint 60 is formed at the tip of the flange portion 20 of the deck plate 14 . A joint 60 of the deck plate 14 provided on one side of the beam 12 is formed by folding back the flange portion 20 along the upper surface. A joint 60 of the deck plate 14 provided on the other side of the beam 12 is formed by folding back the flange portion 20 along the lower surface.

The joint 60 of the deck plate 14 on one side of the beam 12 and the joint 60 of the deck plate 14 on the other side of the beam 12 are meshed with each other, and the meshing portion 62 where both joints 60 are meshed is placed on the beam 12. It is embedded in slab concrete 18 . As a result, when an impact load acts on the upper surface 18A of the slab concrete 18, the end of the deck plate 14 is joined to the slab concrete 18 on the beam 12, which is a horizontal member, so that the deck plate 14 bears the impact load. A second joining means is provided.

Even with such a structure, the ends of the deck plate 14 can be joined to the slab concrete 18 on the beams 12, so the same effects as in the fourth embodiment can be obtained.

Further, since the joint 60 of the deck plate 14 on one side of the beam 12 and the joint 60 of the deck plate 14 on the other side of the beam 12 are engaged, the effect of preventing the deck plate 14 from separating from the beam 12 can be enhanced. can.

(13th embodiment)
FIG. 15 is a diagram showing an RC floor slab 10 according to the thirteenth embodiment. Parts that are the same as or equivalent to those of the fourth embodiment are denoted by the same reference numerals and explanations thereof are omitted, and only different parts will be explained. . The method of forming the RC floor slab 10 is the same as in the fourth embodiment.

This embodiment differs from the fourth embodiment in the joint structure between the concrete slab 18 and the deck plate 14 .

Two reinforcing bars 44 are welded to the flange portion 20 of the deck plate 14. The reinforcing bars 44 protrude upward from the flange portion 20 and are embedded in the slab concrete 18 while being placed on the beams 12. . As a result, when an impact load acts on the upper surface 18A of the slab concrete 18, the end of the deck plate 14 is joined to the slab concrete 18 on the beam 12, which is a horizontal member, so that the deck plate 14 bears the impact load. A second joining means is provided.

Even with such a structure, the ends of the deck plate 14 can be joined to the slab concrete 18 on the beams 12, so that the same effects as in the fourth embodiment can be obtained.

(14th embodiment)
FIG. 16 is a diagram showing an RC floor slab 10 according to the fourteenth embodiment. Parts that are the same as or equivalent to those of the fourth embodiment are denoted by the same reference numerals and explanations thereof are omitted, and only different parts will be explained. . The method of forming the RC floor slab 10 is the same as in the fourth embodiment.

This embodiment differs from the fourth embodiment in the joint structure between the concrete slab 18 and the deck plate 14 .

A spacer 64 having a U-shaped cross section is welded to the flange portion 20 of the deck plate 14 . The main reinforcing bars 43 and the force distributing bars 44 constituting the slab concrete 18 are welded to the upper portion of the spacer 64 to ensure a covering thickness from the lower surface of the slab concrete 18 to the main reinforcing bars 43 .

The spacer 64 protrudes upward from the flange portion 20 and is embedded in the slab concrete 18 while being placed on the beam 12 . As a result, when an impact load acts on the upper surface 18A of the slab concrete 18, the end of the deck plate 14 is joined to the slab concrete 18 on the beam 12, which is a horizontal member, so that the deck plate 14 bears the impact load. A second joining means is provided.

Even with such a structure, the ends of the deck plate 14 can be joined to the slab concrete 18 on the beams 12, so that the same effects as in the fourth embodiment can be obtained.

In addition, since the deck plate 14 is joined to the main reinforcement 43 and the force distribution reinforcement 44 of the slab concrete 18, the separation prevention effect of the deck plate 14 can be enhanced.

(15th embodiment)
FIG. 17 is a diagram showing an RC floor slab 10 according to the fifteenth embodiment. Parts that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals and description thereof is omitted, and only different parts are described. .

In the deck plate 14 of this embodiment, the tip of the flange portion 20 is bent downward, and a bent portion 66 is formed at the tip of the flange portion 20 . A stopper 68 having an L-shaped cross section is provided at the end of the flange 12B of the beam 12 positioned on the deck plate 14 side, and the tip of the stopper 68 protrudes upward from the flange 12B.

In a state in which the flange portion 20 of the deck plate 14 is supported by the beam 12, a clearance C is provided between the bent portion 66 at the tip of the flange portion 20 and the stopper 68, and the deck plate 14 extends in the length direction by the clearance C. can slide.

When an impact load acts on the upper surface 18A of the slab concrete 18 and the end of the deck plate 14 separates from the beam 12, the length of the clearance C that allows the end of the deck plate 14 and the beam 12 to slide relative to each other. A holding portion 70 that holds and connects is constituted by the bent portion 66 of the flange portion 20 and the stopper 68 .

When forming this RC floor slab 10, a deck plate 14 is laid over beams 12, which are horizontal members constituting the structure. Next, the ends of the deck plate 14 and the beams 12 are connected with the holding portions 70 that connect the deck plate 14 to the beams 12 . Then, concrete is placed on the upper surface of the deck plate 14 to form a slab concrete 18 to form the RC floor slab 10.

(Action)
Next, the operation of this embodiment will be described.

For example, when an impact load acts on the upper surface 18A of the slab concrete 18 due to a dropped object such as a lifted object or a transported object during lifting work, and when the end of the deck plate 14 comes off the beam 12 which is a horizontal member, the deck plate 14 It is connected with the beam 12 via the holding part 70 .

That is, the bent portion 66 and the stopper 68 form a holding portion 70, which is slidable in the length direction corresponding to the clearance C. As shown in FIG. Therefore, even if an impact load is applied, it is prevented from coming off (disengaged), and furthermore, the contact between the bent portion 66 and the stopper 68 prevents a fall.

Therefore, even if the impact load breaks the slab concrete 18 and separates the fragments from the reinforcing bars, the deck plate 14 is connected to the beams 12, so the fragments are received by the deck plate 14 and do not fall below the RC floor slab 10. can be suppressed.

Therefore, as a countermeasure against falling objects, compared to the conventional structure in which the RC floor slab 10 is covered with a lining plate, the construction work can be reduced, and the construction period can be shortened.

(16th embodiment)
FIG. 18 is a diagram showing an RC floor slab 10 according to the sixteenth embodiment. Parts that are the same as or equivalent to those of the fifteenth embodiment are denoted by the same reference numerals and descriptions thereof are omitted, and only different parts are described. .

This embodiment differs from the fifteenth embodiment in the structure of the holding portion that connects the deck plate 14 and the beam 12 .

That is, a deck receiving angle 72 is provided at the end of the flange 12B of the beam 12 located on the deck plate 14 side. The deck receiving angle 72 has a fixed surface 72B fixed to the end surface of the flange 12B of the beam 12, and a shelf surface 72C extending from the upper edge of the fixed surface 72B toward the deck plate 14 side. The flange portion 20 of the deck plate 14 is supported on the shelf surface 72C of the deck receiving angle 72. As shown in FIG.

Furthermore, one end of a sheet 74 is fixed to the upper surface of the flange 12B of the beam 12 with an adhesive 34, and the other end of the sheet 74 is fixed to the flat plate portion 14A of the deck plate 14 with an adhesive 34. ing. Materials for the sheet 74 include metal sheets, and non-metal sheets include organic fibers (made of polyester, acrylic, etc.) and inorganic fibers (glass fiber, steel fiber, carbon fiber, etc.).

The sheet 74 is folded over the flat plate portion 14A of the deck plate 14 so that the sheet 74 is not embedded in the slab concrete 18 .

As a result, when an impact load acts on the upper surface 18A of the slab concrete 18 and the flange 20 at the end of the deck plate 14 comes off the beam 12, which is a horizontal member, the flange 20 of the deck plate 14 and the beam 12 are connected. A holding portion is configured.

The extra length of the sheet 74 due to folding has the same function as the clearance C in the fifteenth embodiment, and even if the deck plate 14 moves in the longitudinal direction, the sheet 74 can follow within the range of the extra length. . Therefore, it is possible to cope with the deformation of the RC floor slab 10 when an impact load is applied.

When the amount of movement of the deck plate 14 increases and the end of the deck plate 14 comes off the shelf surface 72C of the deck receiving angle 72, the folded portion of the seat 74 unfolds and the deck plate 14 falls off. can be prevented.

In this way, when the deck plate 14 is removed from the shelf surface 72C of the deck receiving angle 72, the deck plate 14 and the beam 12 can be connected by the sheet 74, so that the same effects as those of the fifteenth embodiment can be obtained. can

Moreover, the sheet 74 can be spread between the beam 12 and the deck plate 14 in a state where the deck plate 14 is separated from the beam 12 . Therefore, the spread sheet 74 can receive the fragments separated from the rebar.

(17th embodiment)
FIG. 19 is a diagram showing an RC floor slab 10 according to the 17th embodiment. Parts that are the same as or equivalent to those of the 16th embodiment are denoted by the same reference numerals and descriptions thereof are omitted, and only different parts are described. . The method of forming the RC floor slab 10 is the same as that of the sixteenth embodiment.

This embodiment differs from the sixteenth embodiment in the structure of the holding portion that connects the deck plate 14 and the beam 12 .

That is, one end of the sheet 74 constituting the holding portion is fixed to the upper surface of the flange 12B of the beam 12 with the adhesive 34, and the other end of the sheet 74 is the flange of the deck plate 14 supported by the beam 12. It is fixed to the lower surface of the portion 20 with an adhesive 34 .

The sheet 74 is arranged in a folded state between the flange 12B of the beam 12 and the flange portion 20 of the deck plate 14, and is constructed so as not to be embedded in the slab concrete 18. - 特許庁

As a result, when an impact load acts on the upper surface 18A of the slab concrete 18 and the flange 20 at the end of the deck plate 14 comes off the beam 12, which is a horizontal member, the flange 20 of the deck plate 14 and the beam 12 are connected. A holding portion is composed of a sheet 74 .

The extra length of the sheet 74 due to folding has the same function as the clearance C in the fifteenth embodiment, and even if the deck plate 14 moves in the longitudinal direction, the sheet 74 can follow within the range of the extra length. . Therefore, it is possible to cope with the deformation of the RC floor slab 10 when an impact load is applied.

When the movement amount of the deck plate 14 increases and the end of the deck plate 14 comes off the beam 12, the folding part of the sheet 74 is unfolded to prevent the deck plate 14 from coming off.

In this way, when the deck plate 14 is separated from the beams 12, the deck plate 14 and the beams 12 can be connected by the sheet 74, so that the same effects as those of the sixteenth embodiment can be obtained.

In addition, since the beam 12 and the deck plate 14 are directly connected by the sheet 74, the structure is simplified compared to the case where the receiving member is provided on the flange 12B of the beam 12 and the sheet 74 is provided between the receiving member and the deck plate 14. can do.

(18th embodiment)
FIG. 20 is a diagram showing an RC floor slab 10 according to the eighteenth embodiment. Parts that are the same as or equivalent to those of the fifteenth embodiment are denoted by the same reference numerals and descriptions thereof are omitted, and only different parts are described. . The method of forming the RC floor slab 10 is the same as that of the fifteenth embodiment.

This embodiment differs from the fifteenth embodiment in the structure of the holding portion that connects the deck plate 14 and the beam 12 .

That is, both ends of a wire rod 78 made of a wire formed in a loop shape are welded to the ends of the deck plate 14, and the stud bolt 16 is arranged in the loop of the wire rod 78 formed in a loop shape. It is A clearance C is provided between the loop-shaped wire 78 and the stud bolt 16 so that the wire 78 is locked to the stud bolt 16 when the deck plate 14 is separated from the beam 12. .

As a result, when an impact load acts on the upper surface 18A of the slab concrete 18 and the flange 20 at the end of the deck plate 14 comes off the beam 12, which is a horizontal member, the flange 20 of the deck plate 14 and the beam 12 are connected. A holding portion for stopping is composed of a wire rod 78 .

Even with such a structure, when the deck plate 14 is separated from the beam 12, the wire rod 78 connects the deck plate 14 and the beam 12, so that the same effects as those of the fifteenth embodiment can be obtained. .

In each embodiment, the beam 12 is described as an example of the horizontal member, but the horizontal member is not limited to this. Any supporting member that supports the deck plate 14 may be used as the horizontal member.

Further, in each embodiment, the configuration in which the end of the deck plate 14 is joined to the beam 12, the configuration in which the end of the deck plate 14 is joined to the slab concrete 18 on the beam 12, the end of the deck plate 14 and A configuration in which the beams 12 are connected by the holding portion was implemented separately. However, these configurations may be combined and implemented.

Various aspects can be implemented without departing from the gist of the present invention.

10 RC floor slab 12 Beam (horizontal member)
14 Deck plate 16 Stud bolt 18 Slab concrete 18A Upper surface 20 Flange 22 First joining means 30 Folded part 32 Fixed member 36 Projection 40 Cut-and-raised piece 44 Reinforcement bar 48 Bent part 50 Rivet 52 End bent part 54 Standing wall 62 Engaging part 64 Spacer 70 Holding portion 74 Sheet 78 Wire rod

Claims (3)

RC floor slab formation in which a deck plate is bridged over horizontal members that constitute a structure, and when concrete is placed on the upper surface of the deck plate, the end of the deck plate is embedded in the concrete above the horizontal member. a method,
An end of the deck plate is provided with an upright wall that is bent upward from the horizontal member and has a through hole formed therein,
A reinforcing bar embedded in the concrete is passed through the through hole ,
The RC floor slab forming method. An RC floor slab forming method for spanning a deck plate over horizontal members that constitute a structure, joining the ends of the deck plate to the horizontal members, and pouring concrete on the upper surface of the deck plate,
the horizontal member is an H-beam with a pair of flanges and a web;
An end of the deck plate is provided with a bent portion that is integrated with or separate from the deck plate and hooked on the end of the flange,
The RC floor slab forming method. A deck plate is bridged over horizontal members that constitute a structure, and a holding portion that connects the deck plate to the horizontal member connects the end of the deck plate and the horizontal member, and concrete is poured on the upper surface of the deck plate. An RC floor slab forming method for casting,
the horizontal member is an H-beam with a pair of flanges and a web;
The holding portion is provided at a bent portion in which the tip of the deck plate is bent downward and at an end portion of the flange located on the deck plate side, and protrudes upward from the flange to hold the deck plate from below. a supporting stopper;
The RC floor slab forming method.

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