JPH0610436A - Method for constructing beam-equipped slab - Google Patents

Abstract

PURPOSE:To enable large-span construction by quickening and simplifying the work of arranging reinforcement and forms on site. CONSTITUTION:A precast basement 1 is provided into which lower end main reinforcement 11 for beams arranged in parallel, vertical and horizontal auxiliary reinforcement 12, and the lower portion of each U-open stirrup 13 connected to the lower end reinforcement 11 are embedded with the both open end portions of each stirrup 13 projected upward therefrom and which is formed by installation of a void form 2 of foaming plastic material prior to setting of concrete. The precast basement 1 is continuously laid on site and disposed between the beams, and upper end main reinforcement 31 is passed through the both open end portions of each line of projected stirrups 13 and tie caps 32 are connected to the both open end portions of each stirrup 13. After vertical and horizontal slab reinforcement 4 is arranged, concrete is cast and the reinforcement is arranged and the void form 2 is embedded therein and the upper surface of the concrete is finished into a floor face 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for obtaining a floor having a large span.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, on-site construction of a floor portion requires time and cost for formwork and supporting work, and in particular, beams are installed at short intervals in order to make it firm. The case was even more troublesome.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention secures a precast base having semi-reinforced beams in factory production, and after placing the remaining beam rebars and slabs on-site, concrete placing is performed. A method for quickly and inexpensively constructing a floor portion is provided.

[0004]

For this reason, according to the present invention, the ribs of the ribs connected to the lower end main bars are embedded by arranging the lower end main bars for beam beams arranged in parallel at a predetermined interval and the auxiliary bars. Form a precast base consisting of both ends protruding upwards,
This is laid between the beams, a void form is placed between each rib, the upper end main bar and the cap tie are connected to the protruding end of each rib, and the slab muscle that passes through the protruding upper part of each rib. The floor is integrated by arranging and placing concrete. The void form may be installed at the time of molding the precast substrate.

[0005]

[Operation] While pre-casting a precast base plate in which the bottom main reinforcement and auxiliary reinforcement are embedded and the ribs are connected to each bottom main reinforcement, the precast foundation is continuously laid between the beams. The ceiling surface is formed flush with the lower surface of the base, the void formwork is arranged between the respective ribs, and the upper end main bar and the cap tie are connected to the protruding ends of the respective ribs. The beam and floor are integrated by arranging the slab reinforcement that passes through the projecting upper part and placing it in concrete, and the beam is interposed between the beam and the ceiling surface to form a reinforcing structure.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. First, the precast base 1 shown in FIGS. 2 and 3 is manufactured in a factory. In the base 1, the lower end main bars 11 for small beams that are arranged in parallel at a predetermined interval are laid and embedded, and the vertical and horizontal auxiliary Reinforcing bars 12 are embedded, and the lower part of U-shaped open ribs 13 connected to the lower end main reinforcing bar is embedded and both open end portions are projected upward. is there. Further, in this example, a void mold 2 made of a foamed plastic material is installed between the respective ribs 13 protruding upward and fixed on the base 1 before the concrete is hardened.

At the site, the precast base 1 is continuously laid and arranged between the beams, and as shown in FIG. 4, the upper main ribs 31 are inserted into the open both ends of the ribs 13 in each protruding row, and each of the ribs 13 is inserted into the ribs 13. Cap ties 3 on both open ends of the ribs 13
2 are connected to each other, and the vertical and horizontal slab muscles 4 passing above the ribs 13 are arranged. Then, concrete is cast on the laid precast substrate 1 to embed the reinforcing bar and the void form 2, respectively, and the upper surface is finished to become the floor surface 5.

As described above, according to this embodiment, the floor which is integral with the beam is formed between the beams by the site casting, and the ceiling surface 6
Therefore, the surface becomes flat and the unevenness due to the conventional beam is not generated. In addition, as shown in FIG. 1, the main beams 11 and 31 and the beam 7 composed of the beam reinforcements of the ribs 13 are formed in parallel inside, so that a large span can be constructed. Further, the weight can be reduced by interposing the void mold 2 of the foamed plastic material.

The excellent effect of this example is that the lower bar arrangement is pre-cast on the base 1 by precasting so as to facilitate the bar arrangement work on site. For this reason, only the upper part needs to be laid out on site, and since the void formwork 2 is also attached to the precast substrate 1, formwork is not necessary and the work on site is quick and easy.

Although the method of this example is configured as described above, the present invention is not limited to this. For example, regardless of the arrangement of auxiliary muscles embedded in the precast base,
The state of the beam reinforcement and the slab reinforcement is not limited. If the Kaiser truss rebar 8 is provided and the base portion is embedded in the precast base as shown by the phantom line in FIG. 1, the precast base can be easily lifted. Furthermore, the shape and material of the void mold are also appropriate. The void form may not be installed at the time of molding the precast substrate, and may be placed on site. Moreover, it goes without saying that an unbonded PC steel rod or the like may be used.

[0011]

EFFECTS OF THE INVENTION According to the present invention, since the lower reinforcing bar is formed by the precast base produced in the factory, the reinforcing bar can be arranged on-site quickly and easily, and since the beam 7 is formed inside in parallel, a large span can be obtained. Since the construction is possible, the ceiling surface is also flush and the concavities and convexities due to the conventional beam are not generated. Also,
According to the second aspect, since the void formwork is attached to the precast substrate, the on-site formwork work is unnecessary.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a slab obtained according to an embodiment of the present invention.

FIG. 2 is a perspective view in which a precast substrate used therein is partially omitted.

FIG. 3 is an enlarged vertical sectional view of the precast substrate.

FIG. 4 is a vertical cross-sectional view showing a laid bar arrangement state on site.

FIG. 5 is a vertical sectional view of a conventional slab.

[Explanation of symbols] 1 precast base 11 bottom main bar 12 auxiliary bar 13 U-shaped open ribs 2 void form 31 top main bar 32 cap tie 4 slab bar 5 floor 6 ceiling 7 beam

Claims (2)

[Claims] 1. A precast base body having bar-shaped lower end main bars arranged in parallel at predetermined intervals and having auxiliary ribs embedded therein, and both end portions of ribs connected to the lower-end main bars protruding upward. Form a space between the beams, place a void form between each rib, connect the upper end main bar and the cap tie to the protruding end of each rib, and project the upper part of each rib. A method for constructing a slab with a beam, characterized in that the floor portion is integrated by arranging the slab reinforcements that pass through it and placing it in concrete. 2. The method for constructing a slab according to claim 1, wherein a void form is installed at the time of molding the precast substrate.