JPH05106293A - Hollow composite slab construction - Google Patents

Abstract

PURPOSE:To make it possible to execute a hollow slab as a dynamically rational two-way slab by a method saving energy and man-power in field work. CONSTITUTION:One way slabs 5 into which apart of beam type reinforcing bars 1 having no upper end reinforcing bar 3 in a parallel direction with a long side of the slab is buried are built in a semi-PC slab 4. After that, beam type reinforcing bars 2 assembled in advance at right angles are dropped between the beam type reinforcing bars 1 having no upper end reinforcing bar, and then, upon placing the upper end reinforcing bars 3, the later placing concrete 8 is placed. According to the constitution, a dynamically rational two way slab construction saving energy and man-power can be obtained.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a hollow synthetic floor slab construction method.

[0002]

2. Description of the Related Art In recent years, in the design of apartment houses, there has been an increasing demand for large span slabs without beam beams in the dwelling unit in order to diversify the needs, increase the class and expand flexibility. Especially, the opening is smaller than the depth (for example, 5.6 x 11 m) like a dwelling unit in a plate-type standard housing, and is closer to a square (for example, 8.0 x as the quality increases).
8.0m or 10.0x10.0m) is increasing. On the other hand, there are many floor slab construction methods aimed at labor saving in the field in such a large span slab without beam joists, but among them, a composite floor slab construction method using a half-PC slab to reinforce the assembly reinforcement that can be the main beam reinforcement. Is most often adopted as an excellent construction method from the viewpoint of ensuring required quality (integration and sound insulation) as a floor board and saving labor. When constructing a square-shaped product by this synthetic floor slab construction method, it is often designed as a unidirectional plate in consideration of the joints of the half-PC plate. Especially in the case of hollow floor slabs where the slabs are made lighter, they are all unidirectional plates.

[0003]

However, although there is no particular problem with the method of carrying the load only on one side, in the case of an elongated rectangle (λ> 1.5) where the short side and the long side are obviously different from each other, When it is close to a square, (λ ≦ 1.2) is not desirable because it is extremely unreasonable in terms of dynamics because reinforcement of originally unnecessary reinforcements and concrete thickness is required only in one direction side. . However, if we decided to arrange beam-type reinforcing bars in orthogonal directions on the site to make it a mechanically rational two-way version, it would not be easy for the preceding beam-type reinforcing bars to be an obstacle, and the current construction skills Due to the shortage of workers and the aging of population, there is a problem that it goes against the need for labor-saving and labor-saving construction methods at construction sites. The present invention has been made in view of such problems of the conventional technique, and the object thereof is a one-way plate in a half-PC plate state,
Place pre-assembled beam type reinforcing bars in the orthogonal direction at the site and after placing the above concrete to complete the composite floor slab, make it a hollow floor slab with a rational mechanical function as a two-way slab. It is intended to provide a hollow synthetic floor slab construction method that can be used.

[0004]

In order to achieve the above-mentioned object, the method of the present invention is to embed a part of a beam type rebar having no upper end streak in the half PC plate in the direction parallel to the long side of the plate. Build a unidirectional plate with a hollow forming material set, then drop the pre-assembled beam type reinforcing bars in the orthogonal direction between the beam type reinforcing bars without the upper end bars, and then arrange the upper end bars. In addition, after-cast concrete is placed.

[0005]

According to the construction method configured as described above, since the beam-type reinforcing bar in the one-way version of the pre-installed building does not have the upper end bar, the beam pre-assembled in the orthogonal direction between these bar arrangements. Since it is permissible to drop the type rebar, significant labor and labor saving of the rebar work can be achieved. After this, the upper streak, which has been omitted from the assembly, can be easily assembled by inserting it horizontally and lifting it up. Thus, a mechanically rational arrangement is achieved with labor saving and labor saving. The hollow forming material set applied between the reinforcements may be assembled at the completion of reinforcements or preliminarily at the time of preliminary unidirectional plate production, and it can be selected arbitrarily, but the latter is the site. This is advantageous in that the degree of work skipping increases.

[0006]

EXAMPLES Examples will be described with reference to the drawings.
In FIG. 1 and FIG. 2, reference numerals 1 and 2 in the drawings respectively indicate a pre-installed X-direction beam-type reinforcing bar and a trailing orthogonal Y-direction beam-type reinforcing bar, the former being half-assembled as described later. It is embedded in the PC plate and the latter is dropped and assembled in the direction orthogonal to the preceding X-direction beam type reinforcing bar, but only the upper end bar 3 of the X-direction beam type reinforcing bar 1 is temporarily assembled in order to form the reinforcing bar structure. It has been embedded in the half-PC version and will be removed when it becomes stable.

The unidirectional plate 5 is placed in the half-PC plate 4 in such a manner that the lower part of the beam-type reinforcing bar 1 preassembled as parallel to the long side of the plate is embedded in the half-PC plate 4.

In the case of FIG. 2, the setting of the hollow forming material 6 is also completed at this time.

The unidirectional plates 5, ... Are laid between large beams (not shown) to be built on site. The girders 7 and 7 shown in the drawing are at both ends in the orthogonal direction.

The above-mentioned pre-assembled Y-direction beam type reinforcing bar 2,
... is dropped in the direction orthogonal to the X-direction beam type reinforcing bar 1 in the one-way plate 5. It is good to make adjustments so that the hoop muscles do not interfere with each other at the intersection.

After the dropping, the upper end bar 3 of the X-direction beam type reinforcing bar 1 which has been removed is passed over and assembled.

A hollow forming material 6, ... Is set between the reinforcing bars 1 and 2 (in the case of FIG. 1). Finally, on-site concrete 8 is poured to finish.

The flow chart of the steps shown in FIGS. 1 and 2 can be summarized as shown in FIGS.

When the sectional structure of the hollow synthetic floor slab according to the present invention is analyzed, as is clear from FIGS. 6 to 13, the structure is a bidirectional plate and there is no imbalance between the X and Y directions. It can be seen that the mechanical rationality is excellently secured.

[0015]

Since the present invention is constructed as described above, it has the following effects. In other words, floor slabs with a maximum span close to a square are possible,
By eliminating the beams, it becomes possible to design buildings (especially apartments) that need to accommodate the flexibility of the plan. In addition, it becomes dynamically rational as a two-way version, and it is possible to reduce the quantity, and thus the cost.

[Brief description of 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.

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

FIG. 5 is a plan view of a hollow synthetic floor slab according to the present invention.

FIG. 6 is a sectional view taken along the line aa ′ in FIG.

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

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

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

FIG. 10 is an enlarged cross-sectional view showing a bar arrangement in a to a'in FIG.

FIG. 11 is an enlarged cross-sectional view showing bar arrangement in b to b ′ in FIG. 5.

FIG. 12 is an enlarged cross-sectional view showing the reinforcement arrangements c to c ′ in FIG.

FIG. 13 is an enlarged cross-sectional view showing the reinforcement arrangements d to d ′ in FIG.

[Explanation of symbols]

 1 X-direction beam type reinforcing bar 2 Y-direction beam type reinforcing bar 3 Upper end bar 4 Half PC version 5 Unidirectional version 6 Hollow forming material 7 Large beam 8 Cast-in-place concrete

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Matsuzaki ▲ Takashi ▼ 21-21 Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Inventor Yu Yoshioka, Ginza 8-chome, Chuo-ku, Tokyo 21st-1 Stock Company Takenaka Corporation Tokyo Main Store

Claims (2)

[Claims] 1. A unidirectional plate in which a part of a beam-type reinforcing bar having no upper end bar is embedded in a half PC plate in a direction parallel to the long side of the plate, and then a pre-assembled beam-type reinforcing bar in an orthogonal direction is installed. A hollow composite floor slab characterized by being dropped between beam-type reinforcing bars without upper end bars, and after that, reinforcement of the upper end bars and a hollow forming material set are applied, and then post-cast concrete is placed. Construction method. 2. A half-PC plate is constructed by embedding a part of a beam-shaped reinforcing bar having no upper end streak in a direction parallel to the long side of the plate and at the same time constructing a unidirectional plate on which a hollow forming material set has been applied, and then in an orthogonal direction The hollow structure characterized in that the pre-assembled beam-type reinforcing bar is dropped between the beam-type reinforcing bars without the upper end reinforcing bar, and then the upper end reinforcing bar is arranged and then the post-cast concrete is placed. Synthetic floor slab method.