JP3172882B2 - Full precast floor slab method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full precast slab method.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for large span slabs having no small beams in dwelling units in order to diversify and upgrade the needs and expand flexibility in the design of apartment houses. In particular, the opening is smaller than the depth (for example, 5.6 × 11 m) such as a dwelling unit in a plate-type standard apartment house, and is closer to a square (for example, 8.0 ×
The need for 8.0 m or 10.0 × 10.0 m) is increasing. On the other hand, there are many floor slab construction methods aimed at labor saving at the site in large span slabs without such small beams. Among them, a composite slab construction method using a semi-PC slab that reinforces the reinforcing steel bar that can be the main beam reinforcement Is most often adopted as a method that is superior in securing required quality (integration and sound insulation) as a floor slab and saving labor. As even better, there is a proposal of a construction method using a full precast slab in order to eliminate cast-in-place concrete in the above construction method. There are floor slabs. When constructing something close to the above square with this floor slab method,
As a matter of course, this full precast version can be designed as a one-way version that can withstand its own weight and the calculated load because the frame is completed by erection between girders without after-site concrete on site Many. In particular one of the ribs in the case of slab light <br/> capacity has been deck or a hollow slab Ribbed
It is a one-way version because it covers all directions.

[0003]

However, there is no particular problem with such a method of paying in only one direction in the case of an elongated rectangle (λ> 1.5) in which the short side and the long side are clearly different from each other. When the shape is close to a square, (λ ≦ 1.2 ) is not desirable because it is extremely unreasonable in terms of mechanics because it is necessary to reinforce the unnecessary arrangement of reinforcing bars and concrete thickness in one direction. The present invention has been made in view of such problems of the prior art, and the purpose thereof is to provide a one-way version in which the function at the time of laying between girders is only sufficient to withstand its own weight. , by a simple joint operation after laying, a reasonable mechanical function of the two-way version
It is an object of the present invention to provide a full precast slab method that can be used as a slab.

[0004]

Means for Solving the Problems To achieve the above object, the method according to the present invention comprises embedding beam type reinforcing bars in the long side direction and the short side direction of the plate, and increasing the strength of the plate against its own weight in the long side direction. A full precast floor slab with grid-like ribs is built between girders, and the level is adjusted by a level adjustment jig. After that, the ends of the ribs in the short side direction that abut each other are tightened and joined via bolts. is there.

[0005]

According to the construction method described above, the ribs in the short side direction, which have been separated and have not been useful mechanically until now, are integrated through through bolts.
It becomes a beam. Until then, full precast floor slabs with lattice ribs, which had only the strength of their own weight, received reinforcement in the direction orthogonal to the rib reinforcement of the one-way slab. A reasonable floor slab is realized .

[0006]

Embodiments will be described with reference to the drawings.
1 and 2, reference numerals 1 and 2 in the drawings denote an X-direction beam-type reinforcing bar that is a long side direction and a Y-direction beam-type reinforcing bar that is a short side direction, respectively. A full precast floor slab 3 with a grid-like rib having an X-direction rib 7 and a Y-direction rib 8 embedded in the inside.

The floor slabs 3 are laid between girders (not shown) to be built on site. The illustrated girders 4, 4 are at both ends in the orthogonal direction.

The laid slabs 3,... Are received by a support 5 supported by a support 5, and the level is adjusted to perform accurate level setting.

After that, the ribs 8, 8 in the short side direction, which are mutually adjoined between the adjacent floor slabs 3, 3, are passed to the adjacent positions, and bolts (PC steel bars) 9,. The ribs 8 are continuously integrated to form a beam. As a result, the laid floor slabs 3,... Become precast lattice floor slabs having mechanical functions as two-way slabs.

The steps shown in FIGS. 1 and 2 can be summarized as shown in FIGS.

Analysis of the cross-sectional structure of the composite floor slab according to the present invention reveals that the composite floor slab is composed of a two-way slab as shown in FIGS. 6 to 13 and FIGS. It can be seen that there is no imbalance and the rationality in mechanics is excellently secured.

[0012]

Since the present invention is configured as described above, it has the following effects. In other words, a floor slab with a maximum span close to a square becomes possible,
Eliminating small beams makes it possible to design buildings (especially multi-family dwellings) that need to accommodate the flexibility of the plan. In addition, it becomes dynamically rational as a two-way version, so that the quantity can be reduced and the cost can be reduced. further,
Since it is a full precast version and does not require post-cast concrete, the advantage of labor saving can be enjoyed compared to the half precast version. In the case of an inverted rib type floor slab, the space under the floor can be effectively used for storage under the floor, piping below the floor, and the like, which is preferable.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a process procedure of the present invention.

FIG. 2 is an explanatory view of a process procedure of the present invention.

FIG. 3 is a flowchart of the process procedure of FIG. 1;

FIG. 4 is a flowchart of the process procedure of FIG. 2;

FIG. 5 is a plan view of a composite slab which uses a regular rib type slab according to the present invention.

FIG. 6 is a sectional view taken along line aa ′ of FIG. 5;

FIG. 7 is a sectional view taken along the line b-b 'in FIG.

FIG. 8 is a sectional view taken along a line c-c 'in FIG.

9 is a sectional view taken along the line d-d 'in FIG.

FIG. 10 is an enlarged cross-sectional view illustrating the arrangement of the bars a to a ′ in FIG. 5;

FIG. 11 is an enlarged cross-sectional view illustrating the arrangement of the bars bb ′ in FIG. 5;

FIG. 12 is an enlarged cross-sectional view illustrating the arrangement of lines c to c ′ in FIG. 5;

FIG. 13 is an enlarged cross-sectional view illustrating the arrangement of the bars d to d ′ in FIG. 5;

FIG. 14 is a plan view of a composite slab which uses an inverted rib type slab according to the present invention.

FIG. 15 is a sectional view taken along line a-a ′ in FIG. 14;

FIG. 16 is a sectional view taken along the line b-b 'in FIG.

17 is a cross-sectional view taken along a line c-c 'in FIG.

FIG. 18 is a sectional view taken along the line d-d 'in FIG.

FIG. 19 is an enlarged cross-sectional view illustrating the arrangement of the bars a to a ′ in FIG. 14;

FIG. 20 is an enlarged cross-sectional view illustrating the arrangement of bars bb ′ in FIG. 14;

FIG. 21 is an enlarged cross-sectional view illustrating the arrangement of the bars c to c ′ in FIG. 14;

FIG. 22 is an enlarged sectional view showing the arrangement of the bars d to d ′ in FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 X-direction beam type reinforcing bar 2 Y-direction beam type reinforcing bar 3 Full precast floor slab 4 Large beam 5 Prop 6 Support 7 X-direction rib 8 Y-direction rib 9 Through bolt

Continuation of the front page (72) Inventor Matsuzaki ▲ Takashi ▼ 8-1-1 Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor Yasuhiko Shuto 8-2-1-1, Ginza, Chuo-ku, Tokyo Takenaka Corporation Tokyo Head Office (56) References JP-A-64-17947 (JP, A) JP-A-47-28731 (JP, A) JP-A-61-17947 (JP, A) JP-A-3 1772437 (JP, A) Japanese Utility Model Showa 63-190420 (JP, U) Japanese Patent Publication No. 52-27526 (JP, B2) Japanese Patent Publication No. 38-27635 (JP, B1) (58) Field surveyed (Int. . ^7, DB name) E04B 5/02

Claims (3)

(57) [Claims] 1. A full-precast floor slab with a grid-like rib having a strength against its own weight in the long side direction, in which beam type reinforcing bars are embedded in the long side direction and the short side direction of the slab. after adjusting the level by adjusting jig, the short of long side ribs between the short side direction of the rib ends butted together
By tightening and joining the upper and lower two-stage through-bolts on both sides of the side-direction rib wire , the short-side direction ribs are integrated via the through-bolts to form a beam and have strength in both directions. Full precast floor slab construction method. 2. The method of claim 1, wherein the ribs of the ribbed full precast slab are regular ribs. 3. The method of claim 1, wherein the ribs of the ribbed full precast slab are reverse ribs.