JP3872981B2 - Reinforced concrete slabs - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slab having a reinforced concrete structure.
[0002]
[Prior art]
Generally, the amount of slab upper bar reinforcement in a reinforced concrete structure slab having a stepped portion is determined in accordance with the maximum force on one side. When this is applied to a slab or void slab 26 of a reinforced concrete structure, as shown in FIGS. 6 and 7, the amount of bar arrangement of the slab upper bar 29 corresponding to the force (maximum force on one side) 28 generated in the rib 27 It becomes.
On the other hand, in order for the void slab 30 to exhibit the required performance, the PC board 31 and the cast-in-place concrete 32 need to be integrated. For this reason, as shown in FIG. 8, when the force 28 at the interface between the PC plate 31 and the cast-in-place concrete 32 in the rib 27 exceeds the allowable value, that is, the force 33 that can be borne per rib, the slab thickness It was thick.
[0003]
[Problems to be solved by the invention]
However, slabs or void slabs with a reinforced concrete structure having the former step portion are uneconomical and concrete because the amount of bar arrangement to ribs other than the ribs with large force burden is two to three times the required amount. There was a problem that the filling property was lowered. The latter void slab is uneconomical because the slab thickness must be increased.
[0004]
This invention is made | formed in view of these problems, The objective is to provide the slab which can be set as the amount of bar arrangement according to the load degree of force, or economical slab thickness.
[0005]
[Means for Solving the Problems]
The gist of the slab of a reinforced concrete structure according to the invention of claim 1 that solves the above problems is that the slab body of the concrete structure supported by beams and walls is divided into a plurality of zones according to the magnitude of the force, The slab upper end reinforcement according to the force acting on each zone is arranged. The slab body includes a stepped portion. In addition, the slab body includes a precast concrete board installed adjacently. Furthermore, it includes that the void formwork is installed in the precast concrete board.
[0006]
Further, the gist of the slab of the reinforced concrete structure according to the invention of claim 5 is the slab body in which the cast-in-place concrete is placed on the precast concrete plate in which the void form is installed, which are arranged adjacent to each other between the beams. It is characterized in that it is divided into a plurality of zones according to the magnitude of the acting force, and the number of ribs or the width of the ribs formed between the void molds is determined according to the force acting on each zone.
[0007]
By arranging the slab upper end bars according to the force acting on each zone in the slab body, it is possible to achieve an economical bar arrangement amount. Further, by determining the number of ribs formed between the void molds or the width of the ribs according to the force acting on each zone, an economical reinforced concrete structure slab can be formed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a slab having a reinforced concrete structure (hereinafter referred to as a slab) according to the present invention will be described. This slab is made of cast-in-place concrete slab, precast concrete board, so-called half precast concrete board or full precast concrete board (hereinafter referred to as half PC board or full PC board), void slab, void deck slab, deck slab, prestressed concrete slab Prestressed concrete void slabs, including those with or without stepped portions. In the embodiments, the same components are described with the same reference numerals, and only different components are described with different reference numerals.
[0009]
FIG. 1 shows a void slab 1 which is a slab of the first embodiment. This void slab 1 has a stepped portion 2, and half PC plates 4 a having a void mold frame 3 installed on the entire surface are laid on both sides between the beams, and part of the void mold frame is between these half PC plates 4 a. A lower floor 5 is formed by laying a half PC plate 4b on which 3 is not installed, and a slab upper end reinforcement 6 is arranged on the lower floor 5 and arranged.
[0010]
In the void slab 1, as shown in the drawing, a large force 16 is applied around the stepped portion 2, and a large difference is generated in the degree of force burden between the periphery of the stepped portion 2 and other portions. Therefore, as shown in FIG. 2, according to the magnitude of the force 16 acting in the long side direction of the slab 1 having the stepped portion 2, a plurality of zones, that is, the stepped portion peripheral zone 7, the stepped portion zone 8, and the other portions. Each of the slab upper bars 6 was divided into zones 9 and an amount corresponding to the maximum force 16 acting on these zones 7, 8, 9 was arranged. For example, as shown in (2) of the figure, the step-periphery zone 7 is subjected to a larger force 16 than the other zones 8 and 9, and therefore the slab upper end muscle 6 having an amount corresponding to this is arranged. In addition, the slab upper end muscle 6 having a smaller amount than that of the zone 7 is arranged in the step zone 8 to which the next largest force 16 acts, and a smaller force acts on the other zones 9 than the others. The smallest amount of the slab top muscle 6 is placed. Thus, by arranging the slab upper bar 6 in an amount corresponding to the maximum force 16 acting on each of the zones 7, 8 and 9, an economical bar arrangement can be achieved and the concrete filling property can be improved. You can also.
[0011]
FIG. 3 shows a void slab 10 according to the second embodiment. This void slab 10 is formed by laying a half PC plate 11 with a void form 3 placed on the entire surface between the beams, and a large force 16 acts on the central portion of the short side of the lower floor 5, and this peripheral portion There is a big difference in the degree of force burden. Therefore, as shown in the drawing, the short side of the lower floor 5 is divided into a plurality of zones, that is, a zone 12 on which a large force 16 acts and a zone 13 other than this, and the maximum force 16 in these zones 12 and 13. The upper slab 6 of the slab was placed in an amount corresponding to. Therefore, the slab upper end reinforcement 6 can be arranged economically as described above, and the filling property of the concrete can be improved.
[0012]
The above-mentioned void slabs 1 and 10 can be formed of a so-called full PC plate, void deck, or spot-cast concrete, and a void slab without a step portion can be formed of a full PC plate, void deck, or spot-cast concrete. it can.
[0013]
FIG. 4 shows a void slab 14 of the third embodiment. Similar to the above, this void slab 14 is formed by laying a half PC plate 15 with the void form 3 placed on the entire surface between the beams, and a large force 16 is applied to the center of the short side of the slab body 5. It is working. This force (force indicated by a one-dot chain line) 16 exceeds the force 33 that can be borne per rib in a void slab (void slab formed by half PC plates in which void form frames are arranged at equal intervals) as shown in FIG. ing. Therefore, as shown in the drawing, the short side of the slab body 5 is divided into a plurality of zones, that is, the zone 17 where the large force 16 acts and the other zones 18, and the void type of the zone 17 where the large force 16 acts. By dividing the frame 3 and increasing the number of ribs 19, a large force 16 is distributed and burdened. Therefore, since the large force 16 acting on the central portion of the short side of the slab body 5 can be distributed and loaded by the plurality of ribs 19, it is not necessary to increase the slab thickness, and an economical void slab is constructed. Can do.
[0014]
FIG. 5 shows a void slab 20 of the fourth embodiment. Similarly to the above, this void slab 20 is formed by laying a half PC plate 21 with the void form frame 3 installed on the entire surface between the beams, and can widen the width of the rib 22 to bear the burden per rib. It is a power increase. That is, the force (force represented by the alternate long and short dash line) 34 on the rib in the void slab (void slab by the half PC plate in which the void form frames are arranged at equal intervals) as shown in FIG. As shown in the drawing, the short side of the slab body 5 is divided into a plurality of zones, that is, a zone 23 where the large force 16 acts and a zone 24 other than this. However, the void form 25 in the zone 23 where the large force 16 acts is reduced to widen the width of the rib 22 to increase the force that can be borne per rib. Therefore, since the large force 16 which acts on the center part of the short side of the slab main body 5 can be borne by the rib 22 having an increased width, it is not necessary to increase the slab thickness, and an economical void slab can be constructed. it can. In addition, the method of expanding the width of the rib 22 can be performed by moving the void form frame 25 to both sides in addition to the above.
[0015]
In addition, the reinforcement arrangement of the slabs 1, 10, 14, and 20 of the first to fourth embodiments is applied to slabs made of half PC plates or full PC plates, void deck slabs, deck slabs, prestressed concrete slabs, prestressed concrete void slabs. Can also be applied.
[0016]
【The invention's effect】
By arranging the slab upper end bars according to the force acting on each zone in the slab body, it is possible to achieve an economical bar arrangement amount.
[0017]
An economical void slab can be formed by determining the number of ribs formed between the void molds or the width of the ribs according to the force acting on each zone in the slab body.
[Brief description of the drawings]
FIG. 1 is a plan view of a void slab according to a first embodiment.
FIGS. 2A and 2B are plan views in which the slab body of the void slab of the first embodiment is divided into zones, and FIG. 2B is a plan view showing the bar arrangement amount of the zone in FIG.
3A is a plan view in which a slab body of a void slab according to a second embodiment is divided into zones, and FIG. 3B is a plan view showing a bar arrangement amount of the zone in FIG.
FIG. 4 is a plan view of a slab body of a void slab according to a third embodiment.
FIG. 5 is a plan view of a slab body of a void slab according to a fourth embodiment.
FIG. 6 is a void slab having a conventional stepped portion, (1) is a plan view of a slab body, and (2) is a plan view showing the amount of bar arrangement.
7A and 7B are conventional void slabs, in which FIG. 7A is a plan view of a slab body using a half PC plate in which void molds are installed at equal intervals, and FIG. 7B is a plan view showing the amount of bar arrangement.
FIG. 8 is a plan view of a slab body in a void slab formed of a half PC plate in which void molds are installed at equal intervals.
[Explanation of symbols]
1, 10, 14, 20, 26, 30 Void slab 2 Stepped portion 3, 25 Void formwork 4, 11, 15, 21, 31 Half PC plate 5 Slab body 6, 29 Slab upper end muscle 7 Stepped portion peripheral zone 8 Stepped portion Zone 9 Other zones 12, 13, 17, 18, 23, 24 Zone 16, 28 Large force 19, 22, 27 Rib 32 On-site concrete 33 Force that can be borne by one rib

Claims (5)

The concrete structure slab body supported by beams and walls is divided into multiple zones according to the magnitude of the force, and the upper slab reinforcement is arranged according to the force acting on each zone. Slabs with reinforced concrete structure. The slab having a reinforced concrete structure according to claim 1, wherein a step portion is formed on the slab body. 3. A slab having a reinforced concrete structure according to claim 1 or 2, wherein the slab body is formed by adjoining precast concrete plates. The slab having a reinforced concrete structure according to claim 3, wherein a void form is installed on the precast concrete plate. The slab body, in which the cast-in-place concrete is placed on the precast concrete board with void formwork placed adjacent to each other between the beams, is divided into multiple zones according to the magnitude of the acting force. A slab having a reinforced concrete structure, wherein the number of ribs or the width of ribs formed between void molds is determined according to the force acting on each zone.

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