JPH0636111Y2 - Non-capital flat slab structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a non-capital flat slab structure that eliminates the conventional capital without reducing the punching shear strength of the stilt head of the flat slab.

[Conventional technology]

The flat slab structure, which directly supports the slab with the increased support strength by introducing prestress, has no beams so that the indoor space can be effectively used and the wiring and piping work is easy. Widely used in the construction of factories, etc.

However, in the conventional flat slab structure, in order to counteract the punching shearing of the flat slab at the head of the column mainly by the strength of the concrete, a so-called capital is provided in which the slab support region of the column is approximately twice the slab thickness.

[Problems to be solved by the invention]

By the way, the above-mentioned capital causes a drop haunch indoors, and it is not only an obstacle to the effective use of the indoor space of a flat slab without beams, but also the advantages of easy wiring, piping work, etc. are not fully utilized, and the capital formwork is not possible. There was a problem that it was troublesome and prevented the reduction of construction cost and construction period.

The present invention has been made in order to improve the above-mentioned conventional problems, and the purpose thereof is to eliminate the capital of the stilt without reducing the punching shear strength of the flat slab, and to improve the advantages of the flat slab. It is to provide a non-capital flat slab structure that maximizes the performance of the stilt and simplifies the formwork of the pillar head, and reduces the construction cost and construction period.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a diagonal slab that is substantially orthogonal to a punching shear fracture assumed surface of a flat slab that is directly supported on a stilt, and a lower end of the diagonal slab along the bottom of the slab, The slab is composed of a slab-side horizontal part having a hook formed at the end, and a pillar-side horizontal part having a hook formed at the end, following the upper end of the diagonally rising part, along the upper part of the slab. A predetermined number of bend lines whose anchoring lengths on the side of the column and the side of the column are sufficiently secured from the assumed plane of punching shear fracture, and are arranged radially around the axis of the column, and around the diagonal rising portion of the bend line. It is characterized by arranging a number of ring muscles and constructing a frustoconical reinforcing structure in the stigma within the thickness of the flat slab.

[Action]

Shear failure of the flat slab The reinforced structure of the pillar head that is configured within the thickness of the flat slab to counter the punch shear of the flat slab eliminates the conventional capital without reducing the punch shear resistance of the flat slab. It becomes possible.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings.

FIG. 1 is a longitudinal sectional view of a non-capital flat slab structure according to the present invention, and FIG. 2 is a perspective view of a reinforcing structure of the structure.

In the figure, 1 is a column, 2 is a flat slab supported by the column 1, and 3 is a punching shear fracture assumed surface in the flat slab 2, and a conical surface that spreads upward at 45 degrees from the column outer periphery of the column head 1a is formed. There is. Reference numeral 4 is a reinforcement structure formed on the pillar head, and a predetermined number of bend muscles 5 are arranged radially around the axis 1b of the pillar 1, and a predetermined number of ring muscles 6 surrounding the outer circumference of the bend muscles 5.
It is formed in a frustoconical shape from and and is accommodated within the thickness t of the flat slab 2 set by the structural design.

The bend streak 5 includes an oblique rising portion 5a that is substantially orthogonal to the punching shear fracture assumed surface 3 of the flat slab 2 and a rising portion.
It consists of a slab-side horizontal part 5b following the lower end 2a of the slab 2 following the lower end of the 5a, and a pillar-side horizontal part 5c following the upper end of the rising part 5a and a pillar head 1a along the upper part 1b of the slab 2, Both horizontal parts 5
Hooks 5d and 5e with bending angles of 90 and 180 at each end of b and 5c
Are formed. It should be noted that the bend streak 5 secures a sufficient fixing length from the slab punching shear fracture assumed surface 3 to the column 1 side and the slab 2 side, respectively.

The ring reinforcement 6 is arranged in a predetermined number around the oblique rising portion 5a of the bend reinforcement 5, is a reinforcement reinforcement, and is an unbonded PC for introducing prestress to the bend reinforcement 5 and the flat slab 2.
It serves to position the cable 7.

[Effect of device]

As described above, according to the present invention, the bend bar is arranged in a predetermined number in the column head radially around the shaft center of the column so as to be orthogonal to the assumed punching shear fracture surface of the flat slab, and the predetermined number surrounding the bend bar. A frusto-conical reinforcing structure consisting of the ring stirrup of the flat slab is constructed within the thickness of the flat slab, and the conventional concrete strength against the punching shear of the flat slab is opposed by the reinforcing structure. Therefore, it is possible to eliminate the capital without lowering the punching shear strength of the flat slab. Therefore, according to the flat slab structure of the present invention, effective use of the indoor space of the flat slab, wiring,
The advantages such as easy piping work can be further expanded by eliminating the capital, and the floor height can be reduced if the indoor space volume is the same as the conventional one. In particular, there is no need for the capital mold work, which was troublesome and required to increase the construction cost and the construction period, so that the construction cost and the construction period can be greatly reduced.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a vertical cross-sectional explanatory view of a non-capital flat slab structure according to the present invention, and FIG. 2 is a perspective view of a reinforcing structure of the same structure. 1 ... Pillar, 1a ... Pillar head, 1b ... Shaft center, 2 ... Flat slab, 2a ... Bottom, 2b ... Top, 3 ... Shear failure expected surface, 4 ... Reinforcement structure, 5 ...... Bend streak, 5a ...... Diagonal rising part, 5b ...... Slab side horizontal part, 5c ...... Column side horizontal part, 5
d, 5e …… Hook, 6 …… Ring muscle, 7 …… Unbonded PC
cable.

Claims (1)

[Scope of utility model registration request] 1. An oblique rising portion that is substantially orthogonal to an assumed surface for punching shear failure of a flat slab that is directly supported by a column head,
Following the lower end of the diagonal rising part along the bottom of the slab, the horizontal part of the slab on which hooks are formed at the end, and the upper end of the diagonal rising part, along the upper head of the slab, the pillar head, along the end. It is composed of a horizontal part on the side of the column where hooks are formed, and the fixing lengths on the slab side and the column side are sufficiently specified from the above-mentioned assumed punching shear fracture surface. A number of rings are arranged, and a predetermined number of ring muscles surrounding the oblique rising portion of the bend muscle are arranged, and a frustoconical reinforcing structure is configured in the thickness of the flat slab on the stigma. Flat slab structure.