JPS61151355A - Hollow slab - 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] [Industrial Application Field] The present invention relates to a hollow slab formed by embedding a plurality of hollow pipes in concrete.

[Prior art and its problems]

Conventionally, as this type of hollow slab, a lightweight cast-in-place slab constructed by embedding hollow tubes 2 in parallel in one direction in a slab 1 having a reinforced concrete structure is generally known, as shown in FIG.

This hollow slab is considered to have a structure in which approximately shaped beams are connected in parallel in the direction in which the hollow tubes 2 are arranged, and in the case of a structure supported by two opposing sides of the beam or wall or a cantilever supported structure,
If one or both longitudinal ends of the hollow tube are supported, the hollow tube 2 can be reinforced with the parallel main reinforcement 3 and shear reinforcing reinforcement 4 arranged along the hollow tube 2, which is convenient. is good.

However, in this conventional hollow slab, when used as a slab supported on all four sides or a beamless plate structure without beams and directly supported by columns, the longitudinal direction of the hollow tube 2 is
It can be reinforced with parallel main reinforcement 3 and shear reinforcement 4, but
This means that the direction perpendicular to the hollow tube 2 is only reinforced by the orthogonal main reinforcing bars 5 and the shear reinforcing plates 4 arranged perpendicular to the hollow tube 2, which is insufficient.

Therefore, conventional hollow slabs cannot be applied to four-sided support or beamless plate structures, or are unreasonable.

As described above, conventional hollow slabs have the problem of being structurally unusable, which limits the scope of their application.

This invention was devised in view of the above-mentioned circumstances, and its purpose is to provide a hollow slab that can be used for four-sided support, beamless plate construction, etc., and has a simple structure.

[Means for solving problems]

According to this invention, a plurality of reinforcing bars are arranged in parallel in a direction orthogonal to a plurality of parallel hollow pipes and are buried in concrete.

The truss-shaped reinforcing bars are constructed by connecting the upper and lower main bars with lattice bars to form an integrated truss-like structure, and a hollow tube is placed between the upper and lower main bars of each truss-shaped reinforcing bar and the lattice bars. This is what I did.

〔Example〕

The present invention will be explained below with reference to illustrated embodiments.

The hollow slab 6 has a plurality of truss-shaped reinforcing bars 7 arranged in parallel.
A plurality of hollow tubes 8 are embedded in the concrete 9 and are arranged in parallel so as to pass through the truss-shaped reinforcement Z in a direction perpendicular to the truss-shaped reinforcement 7. (See FIG. 1) The truss-shaped reinforcing bar 7 is constructed by connecting the upper main bar 1o and the lower main bar 11 with one lattice bar 12 to form an integrated truss-shaped reinforcing bar 7. A subsidiary reinforcement 14 is provided along the hollow tube 8 at the connecting portion 13 of the lattice reinforcement 12 with the upper and lower main reinforcement 10.11.

The hollow tube 8 is connected to the upper and lower main bars 10 and 11 of each truss-shaped reinforcing bar 7.
and the lattice muscle 12, the orthogonal line 13a from the connection part 13 of the upper main reinforcement 10 and the connection part 13 of the lower main reinforcement 11 to the lower main reinforcement 11 and the upper main reinforcement 1o coincides with the diameter line 8a of the hollow tube 8. It is arranged so that it penetrates.

Note that it is possible to secure the piping space 16 by utilizing the corner portions 15 between the lattice reinforcement 12 and the upper and lower main reinforcements 10.11 that occur when the hollow pipe 8 is disposed. C or above Figure 2, 6
(See figure) Fig. 4 shows another aspect of the reinforcement arrangement of the lattice reinforcement 12, which is the truss-shaped reinforcing reinforcement 7. The lattice reinforcement 12 and sub-reinforcement reinforcement 14 form a truss shape to enhance reinforcement. This is what we are trying to ensure.

〔Effect of the invention〕

The present invention has the above configuration and has the following effects.

By arranging multiple truss-shaped reinforcing bars in parallel, which are formed by connecting both upper and lower main bars with lattice bars, and arranging a hollow tube between the upper and lower main bars and the lattice bars in a direction perpendicular to the truss-shaped reinforcing bars. , it can be a truss beam made of reinforced concrete with respect to the direction perpendicular to the hollow tube.

Therefore, the shear strength in the direction perpendicular to the hollow tube is increased, and a considerable load can be transmitted. Further, the lattice reinforcement can also serve as a shear reinforcing reinforcement in the direction of the hollow tube.

In this way, the load transmission direction is not limited to one direction, and there is no need to specify the hollow tube installation direction with respect to the slab support position, so it can be used as a slab supported on all sides. , the application range of hollow slabs can be expanded.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway schematic front view showing a hollow slab of the present invention, Fig. 2 is a partially enlarged sectional view taken along the line A-A in Fig. 1, and Fig. 5 is a sectional view taken along the line B-B in Fig. 2; FIG. 4 is a sectional view showing another aspect of the arrangement of lattice reinforcements, and FIG. 5 is a sectional view showing a conventional hollow slab. 1... Slab, 2... Hollow pipe, 3... Parallel main reinforcement, 4...
Shear reinforcement, 5. Orthogonal main reinforcement, 6. Hollow slab, 7
...Truss-shaped reinforcement, 8..Hollow tube, 8a..Diameter line,
9. Concrete, 10. Upper reinforcement, 11. Lower main reinforcement, 12. Lattice reinforcement, 13. Connection, 15a. Orthogonal line, 14. Secondary reinforcement, 15. Corner, 16.・Space for piping.

Claims (1)

[Scope of Claims] In a hollow slab formed by embedding a plurality of parallel hollow pipes in concrete, a plurality of truss-shaped reinforcing bars are integrally formed by connecting upper main reinforcements and lower main reinforcements with lattice reinforcements. A hollow slab characterized in that the hollow tubes are arranged in parallel and arranged in a direction orthogonal to the truss-shaped reinforcing bars between the upper and lower main bars of the truss-shaped reinforcing bars and the lattice bars.