JPS63255441A - Flat slab structure and execution thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flat slab JMi in a reinforced concrete building and a method of constructing the same.

[Conventional technology and its problems]

The most common floor slab structure for buildings is one in which a planar slab is supported on top of a beam.

In this structure, the beam protrudes convexly from the bottom of the slab, so the effective floor height is low, and the flat slab structure is an effective structure when it is necessary to secure a sufficient effective I15 height. It is being

In a normal flat slab structure, the slab formwork is formed using conventional formwork such as plywood, and PC steel wire is buried within the slab.By increasing the thickness of the slab and introducing prestressing, the slab is Although it is possible to increase the rigidity and widen the span, it is inefficient due to the assembling of conventional formwork, on-site placement of prestressed steel wires, tension, and troublesome work.

This invention was made in view of the above circumstances, and provides a flat slab structure and its construction method that uses a precast concrete plate as a formwork to simplify work, increase rigidity, and enable large spans. is intended to provide.

[Means for solving problems]

The flat slab structure according to the present invention has a rectangular flexible plate 1 in which protrusions are formed on the upper surfaces of at least opposing ends. A PC composite void slab in which a hollow part is formed between the ridges by pouring concrete over the upper part of the ridges on a concrete slab, and the PC
It is composed of a reinforced concrete beam with a flat cross-sectional shape and a thickness dimension that is approximately equal to the thickness dimension of the I-joint void slab, and the side surface of the beam is formed by the protrusion of the precast concrete plate. The void slab and the beam are integrally formed.

Further, in the construction method of a flat slab structure according to the present invention, an elongated rectangular precast concrete beam waste form forming the lower surface of the beam is bridged between the columns, and a protrusion is provided on the upper surface of at least both opposing ends. By placing a rectangular precast concrete plate formed with a rib on the edge of the beam dumping form, both ends of which the protrusion is formed, A plurality of frames are lined up between each other, and concrete is poured between the upper parts of the protrusions of each of the precast concrete plates, and concrete is poured on the top surface of the beam pick-up form and both ends of the beam dump form. By pouring concrete into the space formed by the outer surface of the four protrusions of the placed precast concrete plate, a PC composite void slab having a hollow portion between the protrusions is formed, and The method is characterized in that a beam made of reinforced concrete is formed, with the protruding portion serving as a side surface portion, and the finished dimension being approximately equal to the thickness dimension of the PC composite void slab.

〔Example〕

Embodiments of the flat slab structure and its construction method according to the present invention will be described with reference to FIGS. 1 and 2.

1 and 2 are diagrams showing an embodiment of a flat slab structure according to the present invention.

The flat slab structure shown in these figures consists of a PC composite void slab (hereinafter abbreviated as PVS) 1 and this pvs
A reinforced concrete structure that supports i! It is composed of 22.

The above-mentioned PVS 1 consists of a precast concrete plate (hereinafter abbreviated as PC plate) 3 that constitutes its lower surface and a cast-in-place concrete plate 4 that constitutes its upper surface, and there is a hollow space between these 3 and 4. is formed. The 10th edition 3 is manufactured in advance in a factory or the like to have a predetermined cross-sectional shape and a predetermined length, and has a protrusion 3b formed on the upper surface of the peripheral edge and the upper surface of the intermediate portion of a rectangular flat plate portion 3a. It is. The concrete plate 4 is formed by pouring concrete between the upper parts of the protrusions 3b of the PC plate 3, and thereby a hollow part (void) is formed between the protrusions 3b. There is.

The beam 2 has a lower surface formed by a precast concrete beam dumping frame 6 spanning between columns 5, and a side surface formed by a protrusion 3a on the longitudinal edge of the tenth plate 3,
The interior is made of cast-in-place concrete, and the cross-sectional shape is flat and the dimensions are approximately equal to the thickness of PVS 1. This beam 2 has a longitudinal direction (
A prestress is introduced by the Pcm wire 7 buried in the direction (perpendicular to the plane of the paper in FIG. 1).

In addition, in FIG. 1, numerals 8 and 9 are the main beam reinforcement and stirrup of the beam 2, respectively. The beam discard form 6 has a recess 6b having a shape that matches the cross-sectional shape of the column 5 at both ends in the longitudinal direction of the long rectangular flat plate part 6a, and protrusions 6C on the upper surface of both edges in the width direction. It is formed by the formation of

In the flat slab structure of the above structure, the slab is P
Since the C composite small slab 1 is used, the impact of the slab itself can be greatly reduced even though the slab is sufficiently thick, and therefore the column span can be increased compared to the conventional flat slab structure. Can be done. For this reason,
Because there are no beams protruding from the bottom of the slab and because of the Japanese-style structure, it can be used in a wide space. Furthermore, since prestressing is introduced into the beam 2, it is possible to ensure sufficient horizontal rigidity of the floor surface and the rigidity of the entire building. Note that it is also possible to embed the PC steel wire in the rectangular flat plate portion 6a of the beam waste form 6. In this case, the troublesome work of wiring and tensioning the PCM wires can be done relatively easily at the factory, increasing work efficiency, reducing on-site work, and shortening the construction period.

The configuration of the flat slab structure of this example has been explained above, and now the construction method will be explained.

First, by placing the recessed portion 6b of the beam discard form 6 on the upper edge of the pillar 5, it is bridged between the pillars 5 so as to be continuous in a straight line.

Next, a plurality of 20 plates 3 are lined up and placed between adjacent pieces of the beam waste forms 6 that have been placed as described above.

At this time, the longitudinal edge of the 20th plate 3 is placed on the upper part of the protrusion 6C of the beam discard form 6.

As a result, the upper surface of the flat plate part 6a of the beam waste form 6 and the 20
A beam-shaped space is formed by the outer side of the protrusion 3b of the plate 3.

Next, a formwork (not shown) is spanned between the upper parts of the protrusions 3b of the 20th plate 3, and floor reinforcing bars are arranged on the upper part of the formwork, and the beam main WJ8 and stirrup 9 are placed in the beam-shaped space. , pc
Reinforce m-line 7.

Then, concrete is placed between the beam-shaped space where the reinforcement is arranged and the upper part of the formwork (not shown). Thereby, the beam 2 and the concrete slab 4 are integrally formed. Once the concrete has hardened, the prestressed steel wires are tightened and fixed to complete the construction of the floor for this floor.

By doing as described above, the riding formwork 6 is bridged between the pillars 5, the 20 plates 3 are bridged between the beam throwaway forms 6, and the upper part of the beam throwaway formwork 6 and the 20 Projection part 3 of plate 3
b By pouring concrete between the upper parts of the beam 2
Since the and PC composite void slab 1 are integrally formed, there is no need for formwork work for the beam 2 and the slab, and therefore temporary construction such as shoring and formwork dismantling work can also be omitted, thus shortening the construction period. , it is possible to reduce construction costs.

Note that reinforcing bars are made to protrude from the outer surface of the protrusion 3b,
If the reinforcing bars are buried inside beam 2, the PC
The composite void slab 1 and the beam 2 can be firmly integrated.

〔Effect of the invention〕

According to the flat slab structure according to the present invention, since the slab is a PC composite void slab, the lff1 of the slab itself can be greatly reduced even though the slab is sufficiently thick. In comparison, the column span can be increased. For this reason, there are no beams protruding from the bottom of the slab, and the Japanese style
It can be used in a wide range of spaces.

Further, according to the construction method of a flat slab structure according to the present invention, a beam dumping form is built between the pillars, a precast concrete slab is built between the beam dumping forms, and a beam dumping form is built between the columns. By pouring concrete between the upper part of the precast concrete plate and the upper part of the protruding part of the precast concrete slab,
Since the beam and the PC composite void slab are integrally formed, there is no need for formwork work for the beam and slab, and therefore temporary work such as shoring and formwork dismantling work can also be omitted.
Therefore, it is possible to shorten the construction period and reduce construction costs.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a flat slab structure shown as an embodiment of the present invention, and FIG. 2 is a bottom view of FIG. 1. 1...PC composite void slab (PVS), 2.
...Beam, 3...Precast concrete version (PC version)
, 4... Concrete slab, 5... Column, 6... Discarded formwork for beam.

Claims (2)

[Claims] (1) By pouring concrete over the upper part of the ridges into a rectangular precast concrete slab in which ridges are formed on the upper surfaces of at least opposite ends, a hollow space is formed between the ridges. It is composed of a reinforced concrete beam with a flat cross-sectional shape and a thickness substantially equal to the thickness of the PC composite void slab, and the side surface of the beam is connected to the protrusion of the precast concrete slab. A flat slab structure characterized in that the PC composite void slab and the beam are integrally formed by forming the PC composite void slab and the beam. (2) A long rectangular precast concrete beam waste form that forms the lower surface of the beam is bridged between the columns, and a rectangular precast concrete is formed by forming protrusions on at least the upper surfaces of both opposing ends. A plurality of plates are lined up and spanned between adjacent beam scrap forms by placing both ends on which the protrusions are formed on the edges of the beam scrap forms, and each of the above-mentioned Concrete is cast between the upper parts of the ridges of the precast concrete slab, and the ridges of the precast concrete slab are placed on the upper surface of the beam dumping form and both ends of the beam dumping form. By pouring concrete into the space formed by the outer side surface, a PC composite void slab having a hollow part between the ridges is formed, and the ridges are used as the side surface, and the finished dimensions are A method for constructing a flat slab structure, comprising forming a reinforced concrete beam having a thickness substantially equal to the thickness of the PC composite void slab.