JPH07207794A - Precast synthetic slab - Google Patents

Abstract

PURPOSE:To shorten a construction period by arranging joining notch parts respectively exposing a surface of a deck plate in lengthwise directional both end parts and width directional both end parts of a precast synthetic slab body. CONSTITUTION:Upper main reinforcements 15a and lower main reinforcements 15b are arranged on a deck plate 12 bent in a cross-sectional waveform in the width direction by fixing metal fittings 16, and truss reinforcements 17 and distribution bars 18 are arranged. A form is arranged around the deck plate 12 on which bars are arranged next, and forms in the same shape with lengthwise directional joining notch parts 14a are arranged in lengthwise directional end parts of the plate 12. Next, concrete is placed on the deck plate 12 in a thickness degree that the truss reinforcements 17 are hidden by half and the upper main reinforcements 15a are exposed. The forms are separated, and a precast synthetic slab body 11 in which the deck plate 12 and half precast concrete 13 are integrally formed and which has the lengthwise directional joining notch parts 14a in lengthwise directional both end parts, is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast synthetic slab in which a deck plate and reinforced concrete are integrated, and more particularly, to improve the bondability between slabs and between a slab and a beam.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing a conventional half precast slab, and FIG. 8 is a longitudinal sectional view showing a state in which the same precast slab is joined on a beam. In the figure, 1 is a half precast slab made of reinforced concrete made of rebar and concrete, 2 is a main reinforcement protruding from the surface of the half precast slab 1, and 3 is a truss reinforcement for reinforcing the main reinforcement.

The above-mentioned conventional half precast slab 1 made of reinforced concrete is joined on a beam 4 of H-section steel or I-section steel as follows. As shown in FIG. 8, first, the ends of the half precast slabs 1 to be joined to each other are provided with the beams 4.
Laid on top of. Further, the headed stud 5 is fixed to the central portion above the beam 4 by welding. Next, on the half precast slab 1 laid on the beam 4, which is joined to each other, the streak 6 that intersects with the headed stud 5 and the main bar 2
The grid-like force distribution muscles 7 are arranged above the above. Finally, by placing concrete 8 on the half precast slab 1 on which the differential bars 6 and the force distribution bars 7 are arranged, and hardening it, the half precast slabs 1 are joined together and the half precast slab 1 and the beam 3 and 3 are constructed integrally.

[0004]

In the conventional half-precast slab made of reinforced concrete as described above, the half-precast slabs 1 are joined to each other in the width direction by the differential bars 6 and the like, and the half-precast slab is lengthwise. When the 1 and the beam 4 are integrally constructed, it is necessary to weld the differential bar 6 to the headed stud 5 or to weld the force distribution bar 7 above the main bar 2 to arrange the bar. There was a problem that it took time.

The present invention has been made to solve the above problems, and when the precast slabs are joined together and the precast slabs and the beams are integrally joined,
An object of the present invention is to provide a precast synthetic slab in which the strength of the slab itself is improved, the slabs can be easily and reliably joined to each other and the slab and the beam, and the construction period can be shortened.

[0006]

A precast synthetic slab according to the present invention is a precast synthetic slab formed by attaching reinforcing bars to the surface of a deck plate bent in a cross-sectional shape in the width direction and placing concrete on the surface. The slab body is provided with joining notches exposing the surface of the deck plate at both ends in the length direction and both ends in the width direction.

[0007]

According to the present invention, the rebar is attached to the surface of the deck plate bent in the widthwise direction in the cross-sectional shape, and the precast synthetic slab main body is formed by placing concrete on the surface and the both ends in the length direction and the width. Since the notch for joining that exposes the surface of the deck plate is provided at each end in the direction, when the precast synthetic slab body is constructed on the beam, they are joined to each other laid on the beam The deck plate portion constituting the lower part of the notch for longitudinal joining provided at both ends in the longitudinal direction of the precast synthetic slab body is fixed to the upper surface of the beam by a well-known joining means,
Further, the deck plate portions constituting the lower part of the series of width direction joining notches provided at both widthwise end portions of the precast synthetic slab body are fitted and joined to each other, and then at least the inside of each joining notch portion is joined. By filling with concrete, the precast synthetic slabs, the precast synthetic slabs, and the beams can be easily and reliably joined at the construction site, and the construction period of the precast synthetic slabs can be shortened. Further, since the precast synthetic slab has a synthetic structure in which the deck plate, the reinforcing bars and the concrete are integrated, it has sufficient strength and can take a large span when it is produced as a synthetic slab to be installed on the beam.

[0008]

1 is a partially cutaway perspective view showing a precast synthetic slab according to an embodiment of the present invention, and FIG. 2 shows a notch for longitudinal joining of the precast synthetic slab according to the same embodiment. A cross-sectional view in the length direction showing the state of being laid on the beam,
FIG. 3 is a cross-sectional view in the width direction showing a state in which the end portion in the length direction of the precast synthetic slab of the same example is constructed on the beam, and FIG. 4 is the precast synthetic slab of the same example joined on the beam. FIG. 6 is a cross-sectional view in the length direction showing a state in which it is open. In the figure, 11 is a precast synthetic slab body, 12 is a deck plate that constitutes a part of the precast synthetic slab body, 13 is a half precast concrete that constitutes a part of the precast synthetic slab body, and is integrally joined to the deck plate 12. Has been done. 14a is a plurality of rectangular-shaped notch for lengthwise joining which exposes the surface of the deck plate 12, and 14b is the width of the precast synthetic slab body 11 provided at both ends in the length direction of the precast synthetic slab body 11. It is a series of notches for joining in the width direction, which expose the surfaces of the deck plates 12 provided at both ends in the direction.

The precast synthetic slab body 11 is constructed as follows. When arranging the upper main bar 15a and the lower main bar 15b on the deck plate 12 of a predetermined size, the upper main bar 15a and the lower main bar 15b are rotationally engaged with each other, and the legs are formed on the mountain portion of the deck plate 12. Fixing metal fittings 16 that are locked to the side surface, truss reinforcements 17 that support the upper main reinforcements 15a and lower main reinforcements 15b, and reinforcement muscles that are welded by intersecting the main reinforcements 15 and the truss reinforcements 17 A form is provided around the deck plate 12 in which the reinforcing bars are arranged, and the truss bars 17 are half hidden on the deck plate 12 and the concrete is placed in such a thickness that the upper main bar 15a is exposed. After curing, the mold is released to form the half precast concrete 13, and the deck plate 12 and the half precast concrete 13 are formed.
The precast synthetic slab body 11 is integrated with the above. Further, a rectangular-shaped lengthwise joining notch 14 provided at both ends of the precast synthetic slab body 11 in the lengthwise direction.
a is for providing a mold around the deck plate 12,
It is formed by providing a mold having the same shape as the lengthwise joining notch 14a at the lengthwise end of the deck plate 12. In addition, a series of width direction joining notches 14 provided at both widthwise ends of the precast synthetic slab body 11.
b is formed by setting the widthwise end of the deck plate 12 to be exposed when the mold is provided.

In the precast synthetic slab constructed as described above, when the precast synthetic slab is constructed on the beam, first, the longitudinal end portions of the precast synthetic slab body 11 to be joined to each other on the beam 4 are joined. To lay. Next, a head, which is a joining member, is attached to the deck plate 12 portion that constitutes the lower portion of the longitudinal joining notch 14a provided at the longitudinal end of the precast synthetic slab body 11 that is in contact with the upper surface of the beam 4. The stud 5 is welded and the headed stud 5, the deck plate 12 portion thereof, and the beam 4 are integrally fixed. Next, the deck plate 12 parts constituting the lower part of the series of width direction joining notches 14b provided at both width direction ends of the precast synthetic slab body 11 laid next to each other in the width direction are fitted to each other. To join. After that, a welding wire net 19 is formed on the upper surface of the half precast concrete 13 of the precast synthetic slab body 11.
Is installed, and the concrete 20 is cast to a predetermined thickness and hardened, so that the precast synthetic slab bodies 11 and the precast synthetic slab body 11 and the beams 4 are easily and surely joined at the construction site. As a result, the construction period of the precast synthetic slab can be shortened. Two
0a is a post-cast concrete for finishing. This embodiment has an advantage that the thickness of the precast synthetic slab body 11 can be arbitrarily set.

Further, the precast synthetic slab body 11 has a sufficient strength because it has a synthetic structure in which the deck plate 12 and the half precast concrete 13 are integrated. Therefore, when making the precast synthetic slab body 11 as a slab to be installed on the beam 4, a larger span can be taken as compared with the conventional half precast slab 1 made of reinforced concrete. In the above example,
Although the headed stud 5 is used as a joining means for fixing the deck plate 12 portion forming the lower portion of the notch portion 14a for joining in the lengthwise direction to the beam 4, joining means such as quenching plug welding, Hilte studs and the like. Of course,

FIG. 5 is a cross-sectional view in the width direction showing the precast composite slab according to another embodiment of the present invention in which the lengthwise ends are installed on the beam, and FIG. 6 shows the precast composite slab of the same embodiment. It is a longitudinal cross-sectional view showing a state of being joined on the beam. The precast synthetic slab body 21 of the precast synthetic slab of this embodiment is a deck plate 22.
And precast concrete 2 that is integrally joined to this
3 and 3. Reference numeral 24a denotes a plurality of rectangular-shaped lengthwise joining notches provided at both ends in the length direction of the precast synthetic slab body 21 and exposing the deck plate surface, and 24b denotes a width direction of the precast synthetic slab body 21. It is a series of notch portions for width direction joining which are provided at both ends and expose the surfaces of the deck plates.

The precast synthetic slab body 21 is constructed as follows. When arranging the upper main bar 15a and the lower main bar 15b on the deck plate 22 of a predetermined size, the upper main bar 15a and the lower main bar 15b are rotatably engaged with each other, and the legs are formed on the mountain portion of the deck plate 22. Fixing metal fittings 16 that are locked to the side surface, truss reinforcements 17 that support the upper main reinforcements 15a and lower main reinforcements 15b, and reinforcement muscles that are welded by intersecting the main reinforcements 15 and the truss reinforcements 17 After arranging the welded wire netting 19 on the upper surface of the deck plate 22 in which the reinforcing bars are arranged, a formwork is provided around the welding wire netting 19, and a distance of about twice the distance to the top of the truss bar 17 is provided on the deck plate 22. Precast concrete 23 having welded wire net 19 in addition to the reinforcing bars such as the upper main bar 15a and the lower main bar 15b is formed by pouring concrete to a thickness and hardening it, and then releasing the mold. Precast composite slab body 21 is integral with the Les cast concrete 23 is configured. Further, the rectangular-shaped lengthwise joining cutout portions 24a provided at both ends in the lengthwise direction of the precast synthetic slab body 21 are provided with the lengthwise joining cutout portions 24a when the form frame is provided around the deck plate 22. It is formed by providing a mold having the same shape at the end of the deck plate 22 in the length direction. In addition, the series of width-direction joining notches 24b provided at both ends in the width direction of the precast synthetic slab body 21 expose the width-direction end portions of the deck plate 22 when the form frame is provided around the deck plate 22. Formed by setting to.

In the precast synthetic slab constructed as described above, when the precast synthetic slab is constructed on the beam, first the longitudinal end portions of the precast synthetic slab body 21 to be joined to each other on the beam 4. To lay. Next, the headed stud 5 as a joining member is attached to the deck plate 22 portion that constitutes the lower portion of the longitudinal joining notch 24a provided at the end of the precast synthetic slab body 21 in contact with the upper surface of the beam 4. By welding, the headed stud 5, the deck plate 22 portion thereof, and the beam 4 are integrally fixed. Next, the deck plate 22 portions constituting the lower part of the series of width direction joining notches 24b provided at both width direction end portions of the precast synthetic slab body 21 laid next to each other in the width direction are fitted to each other. To join. Then, the concrete 25 is put in each of the joining notches 24a and 24b provided at the end of the precast synthetic slab body 21.
By simply casting and hardening so as to fill the precast synthetic slab body 21, the precast synthetic slab body 21 and the precast synthetic slab body 21 and the beam 3 are easily and reliably joined at the construction site. The construction period can be shortened. Reference numeral 20a is a finishing post-cast concrete provided on the upper surface of the precast concrete 23. In each of the above embodiments, the deck plates 12 and 22 each have four ridges, but the number of ridges is not limited, and any number of ridges may be used. Of course good things.

[0015]

As described above, according to the present invention, the length of the precast synthetic slab body formed by attaching the reinforcing bars to the surface of the deck plate bent in the widthwise direction and having the corrugated cross section, and placing concrete on the surface. Since the notch for joining exposing the surface of the deck plate is provided at both ends in the width direction and both ends in the width direction, when the precast synthetic slab body is installed on the beam, it is laid on the beam. The precast composite slab body to be joined to each other is fixed to the upper surface of the beam by the well-known joining means, and the deck plate portion constituting the lower part of the notch for longitudinal joining provided at both ends in the longitudinal direction of the body is further precast. Deck plate parts that form the bottom of a series of width-direction joining notches provided at both width-direction ends of the composite slab body are fitted and joined together, and By filling at least each joint notch with concrete after the precast, the precast synthetic slabs, precast synthetic slabs, and beams can be easily and reliably joined at the construction site. This has the effect of shortening. Further, since the precast synthetic slab is a synthetic structure in which the deck plate and the concrete are integrated, it has sufficient strength, and therefore has an effect that a large span can be taken when the slab is constructed on the beam.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a precast synthetic slab according to an embodiment of the present invention.

FIG. 2 is a longitudinal cross-sectional view showing a state in which a notch for joining in the lengthwise direction of the precast synthetic slab of the embodiment is laid on the beam.

FIG. 3 is a cross-sectional view in the width direction showing a state in which the end portion in the length direction of the precast synthetic slab of the example is applied on the beam.

FIG. 4 is a longitudinal cross-sectional view showing a state in which the precast composite slab of the same example is joined on a beam.

FIG. 5 is a cross-sectional view in a width direction showing a state in which a lengthwise end portion of a precast synthetic slab according to another embodiment of the present invention is installed on a beam.

FIG. 6 is a longitudinal cross-sectional view showing a state in which the precast composite slab of the same example is joined on a beam.

FIG. 7 is a perspective view showing a conventional precast slab.

FIG. 8 is a longitudinal sectional view showing a state in which the same precast slab is joined on a beam.

[Explanation of symbols]

 11 Precast Synthetic Slab Main Body 12 Deck Plate 13 Half Precast Concrete 14a Longitudinal Joining Notch 14b Width Joining Notch 15a Upper Reinforcing Bar 15b Lower Reinforcing Bar 16 Fixing Bracket 17 Truss Reinforcing 18 Strengthening Bar 21 Precast Synthetic Slab Main Body 22 Deck Plate 23 Half precast concrete 24a Cutout for joining in the length direction 24b Cutout for joining in the width direction

Claims (1)

[Claims] 1. A lengthwise end and a widthwise end of a precast synthetic slab body formed by attaching reinforcing bars to the surface of a deck plate bent in a cross-sectional shape in the width direction and placing concrete on the surface. A precast synthetic slab, characterized in that each of them is provided with a notch for joining exposing the surface of the deck plate.