JPH0673215U - Void steel pipe with surface ribs - Google Patents

Abstract

(57) [Summary] [Purpose] The rigidity of void steel pipes and the adhesion to concrete have been increased, and the construction accuracy and reliability have been improved along with the workability of void slabs as a structural material for forming and reinforcing hollow parts such as void slabs. To provide a voided steel pipe with surface ribs. [Structure] In a void pipe embedded in parallel in a void slab 7 with a space, a hollow steel pipe 1, 1 formed thick
It is characterized in that a group of ribs 2 and 12 formed by being oriented in the axial direction, the spiral direction or the circumferential direction is arranged on the outer peripheral side of 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a void steel pipe with a surface rib, which is embedded in a void slab or the like and is used as a reinforcing structural material together with the formation of its hollow portion.

[0002]

[Prior art]

 Conventionally, in-situ hollow slab construction method, void pipes such as thin steel sheet winding pipes and paper tubes are arranged in parallel in the cross section of the slab at appropriate intervals, and are placed above and below each void pipe. The upper main bar and the lower main bar are arranged at appropriate intervals so as to be oriented in a direction perpendicular to the same void pipe, and a plurality of upper and lower main reinforcements are arranged in parallel between the void pipes and above and below them. There is a void slab construction method in which concrete is laid out and the hollow pipe is formed inside by the void pipe to increase the thickness of the slab.This void slab construction method is relatively large with no beams. It is constructed as a one-way slab formed on the span, and the hollow part formed by the void pipe has a merit that can be used as equipment piping, duct space, etc.

[0003]

[Problems to be solved by the device]

 Conventional void pipes embedded in void slabs consist of thin steel sheet winding pipes, paper tubes, etc., as described above, and are used as a means to form a hollow portion inside the slab. There are issues such as workability, yield strength, and reliability of the slab, such as the fact that it does not function exceptionally and requires complicated reinforcing bars, and the thickness of the slab becomes large.

The present invention has been developed to address the above-mentioned problems, and its purpose is to increase the rigidity of a void steel pipe and the adhesive force with concrete, and to eliminate voids such as void slabs. The purpose of the invention is to provide a void steel pipe with surface ribs that improves the workability of void slabs and the like, as well as the workability of void slabs, etc.

[0005]

[Means for Solving the Problems]

 The present invention relates to a void pipe that is embedded in a void slab in parallel with a gap, and ribs formed by axially or spirally or circumferentially arranging mutual intervals on the outer periphery of a thick hollow steel pipe. By arranging the groups, a void pipe with excellent rigidity is formed, and the adhesive force with concrete is increased to form a hollow portion and also as a reinforcing structural material.

[0006]

[Action]

 The void steel tube with surface ribs of the present invention is constructed by arranging a rib group formed by orienting in the axial direction, the spiral direction or the circumferential direction on the outer periphery of a thick hollow steel tube, and the rigidity thereof is effective. When it is embedded in a void slab, etc., its rib group significantly enhances the adhesive force with concrete, forming a hollow part such as a void slab and effectively functioning as a reinforcing structural material, and the reinforcement This reduces the thickness and reduces the thickness of the voids, making it easier to construct void slabs, etc., and significantly improving the machining accuracy and reliability.

[0007]

【Example】

 FIG. 1 shows a first embodiment of the present invention, and FIG. 2 shows a second embodiment. In the figure, 10 is a void steel pipe with surface ribs of the first embodiment, 20 is a void steel pipe with surface ribs of the second embodiment, 1 is a hollow steel pipe of the first embodiment, 11 is a hollow steel pipe of the second embodiment, 2 is Ribs formed at the outer circumference of the hollow steel pipe 1 by directing them in the axial direction and in the spiral direction, 12 ribs formed at the outer circumference of the hollow steel pipe 11 by directing them in the circumferential direction, and 5 at the lower end of the slab In the first embodiment shown in FIG. 1, a main bar, 6 is an upper end main bar of the slab, and 7 is a void slab. In the void tube that is embedded in the void slab 7 in parallel with a space, the hollow is formed thickly. Void steel pipe 10 with surface ribs is provided with two ribs formed by arranging them on the outer circumference of steel pipe 1 and directing them in the axial direction and the spiral direction. In the second embodiment shown in FIG. 2, in the void pipe which is embedded in the void slab 10 in parallel at a certain interval, a hollow steel pipe 11 having a thick wall is provided with a mutual interval and oriented in the circumferential direction. The void steel pipe 20 with surface ribs is formed by arranging the ribs 12 formed as described above.

The void ribbed steel pipes 10 and 20 with surface ribs are spaced apart from each other on the outer circumference of the hollow steel pipes 1 and 11 which are formed to be relatively thick, and the axial direction and the spiral direction (see FIG. 1) or the circumferential direction. Direction (see FIG. 2) The structure is such that a group of ribs 2 and 12 formed by directing is arranged to form a thick hollow steel pipe 1 and 11, and further the ribs 2 and 12 as described above on the outer periphery thereof. By arranging groups, they are used as reinforcing materials such as void slabs with excellent rigidity. As shown in FIG. 1, the slabs are arranged at appropriate intervals, and the lower main rebar 5 and the upper main rebar 6 of the slab are oriented in the straight line direction with respect to the hollow steel pipes 1 and 11, respectively. Void slabs 7 are constructed by placing slab concrete at intervals and pouring slab concrete, and by in-situ driving.

The void steel pipes 10 and 20 with surface ribs embedded in the void slab 7 serve as a reinforcing material having excellent rigidity as described above, and also have a group of riffs 2 and 12 arranged on the outer periphery thereof. The adhesive strength with concrete is remarkably enhanced, and it effectively functions as a structural material that reinforces void slabs. That is, the section modulus and structural rigidity of the void slab are significantly increased. Therefore, the workability, construction accuracy, reliability, etc. of the void slab are remarkably enhanced, since the reinforcement of the slab main bars 5, 6 etc. is greatly reduced and the slab thickness is reduced.

In the illustrated embodiment, the application to the void slab is described, but the present invention can also be applied to, for example, a beam or a structural material that is embedded in a load bearing wall for reinforcement.

[0011]

[Effect of device]

 The void steel tube with surface ribs of the present invention is constructed by arranging ribs formed by orienting in the axial direction, the spiral direction or the circumferential direction on the outer circumference of a thick hollow steel tube, and its rigidity is effective. When it is embedded in a void slab, etc., its rib group significantly enhances the adhesive strength with concrete, effectively forming a hollow part such as a void slab and effectively functioning as a reinforcing structure for the reinforcement. Is significantly reduced, the void thickness is reduced, and the workability and reliability of slabs are improved. Therefore, it also has the effect of significantly reducing construction costs.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is a side view showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Hollow Steel Pipe 2 Ribs (Axial Direction, Spiral Direction) 7 Void Slab 10 Void Steel Pipe with Surface Ribs (First Example) 11 Hollow Steel Pipe 12 Ribs (Circumferential) 20 Void Steel Pipe with Surface Ribs (Second Example)

Claims (1)

[Scope of utility model registration request] 1. A void pipe which is embedded in a void slab or the like in parallel with a space therebetween. A group of ribs formed by axially or spirally or circumferentially directing a mutual interval on the outer circumference of a thick hollow steel pipe. A void steel pipe with surface ribs characterized by being provided with.