JPH0716820Y2 - Indoor stair treads - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor stair tread that is discontinuously assembled to a sasara girder.

[0002]

2. Description of the Related Art Conventionally, as an indoor staircase, a continuous assembly type in which a tread is supported by a long bolt on a sasara girder, and a continuous welding type in which a tread, a sasara girder and mutual treads are welded are common. Was used to.

[0003]

However, both the continuous assembling type and the continuous welding type have a tread surface only after the tread plate has been assembled to the sasara girder due to the structure of the assembly joint of each tread plate and the relationship of the welding points. Could not be filled with concrete, and the casting of this concrete could only be done after field installation. For this reason, it took an excessive amount of time to manufacture and finish the stairs, and the work was troublesome.

The present invention has been made in view of the above problems of the prior art, and its object is to fill the tread with concrete before assembling the tread to the sasara girder. Therefore, it is an object of the present invention to provide an indoor stair tread that allows easy and quick manufacture and finishing of stairs.

[0005]

In order to achieve the above-mentioned object, an indoor stair tread according to the present invention is provided with a tread on the metal box, which is provided with riser rising portions, on both sides of the box girder side. It is characterized in that the inside of the box is filled with concrete in a state where at least two nuts are fixed to each inside of the plate.

According to the second aspect, a curved surface is formed between the nosing and the box bottom plate.

[0007]

[Function] Since the nut is embedded in the box body in which the riser riser is welded and the concrete is filled with the concrete so as to form the tread surface, it is manufactured in advance in a factory or the like.
A large number of treads can be made and stocked, and an indoor staircase can be completed easily and easily by simply passing a bolt through a bolt insertion hole formed in a sasara girder and tightening the nut.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. In the figure, 1 is a metal box body, and the box body 1 comprises a front plate 3 forming a nose 2 on the top, side plates 4 and 5 facing a sasara girder (not shown), and a kicking rising part 6 It is constituted by the rear plate 7 of the lower part.

The riser rising portion 6 is formed by welding a square pipe to the rear plate 7 and both side plates 4 and 5.

Two long nuts 8 are welded to the bottom plates 9 toward the respective side plates 4 and 5 in the vicinity of the both side plates 4 and 5 in the box body 1.

When the box 1 is maintained in a horizontal state and the liquid concrete (self-leveling) 10 is filled to the level of the nose 2 and dried, the concrete 1
The upper surface of 0 forms the tread surface 11. In this way, treads can be mass-produced in factories and the like.

When manufacturing an indoor staircase,
It suffices to dispose the girders on both sides and pass the bolts through the bolt insertion holes formed in the girder to fasten the bolts to the nuts in the box body 1.

In the embodiment shown in FIG. 3, the rear plate of the box body 1 is omitted, and the riser 6 is formed by welding a square pipe to the bottom plate 9, and FIG. The rise-up portion 6 is formed in a dome shape.
Is formed into a C shape.

In the embodiment shown in FIG. 6, a semi-circular curved plate is added to the front surface of the front plate 3 to form a curved surface 12 between the nose 2 and the box bottom plate 9. 7 is a curved surface 1 between the nose 2 and the box bottom plate 9 by adding a member having a 1/4 arc cross section.
8 is formed on the curved surface 14 of the front plate 3 itself.
It is what

In addition, the riser rising portion 6 of the tread plate
The shape and curved surface between the nose 2 and the box bottom plate 9 are not limited to those exemplified above, and the combination thereof is also free.

[0016]

EFFECT OF THE INVENTION An indoor stair tread according to the present invention is provided with a kicking rising part in a metal box body, and at least two nuts are respectively provided inside the sasara girder side both plates of the box body. Since the box body is filled with concrete in a fixed state, it is simple, easy and quick to make the stairs by simply fixing the treads to the sasara girders with bolts when manufacturing the stairs. it can. Further, since the treads can be manufactured in a factory or the like in a state where concrete is placed in advance, it is suitable for mass production and can be stocked, resulting in a low cost.

When a curved surface is formed between the nosing and the bottom plate of the box, it is safe as a staircase and is safe and may be used as a decoration.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an indoor stair tread according to the present invention.

FIG. 2 is a perspective view of the tread plate before the concrete is stretched.

FIG. 3 is a sectional view of a tread for indoor stairs according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a tread for indoor stairs according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a tread for indoor stairs according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view of a tread for indoor stairs according to still another embodiment of the present invention.

FIG. 7 is a sectional view of a tread for indoor stairs according to another embodiment of the present invention.

FIG. 8 is a sectional view of a tread for indoor stairs according to another embodiment of the present invention.

[Explanation of symbols]

 1 Metal Box 2 Step Nose 4,5 Side Plate 6 Raising Rise 8 Nut 9 Bottom Plate 10 Concrete

Claims (2)

[Scope of utility model registration request] 1. A step board assembled discontinuously sasara digits in order to configure the indoor stairs, a the tread plate is provided with a riser rising portion in a metal box body, inside of sasara digit side side plates of the box body An indoor stair tread, characterized in that at least two nuts are fixed to each of the boxes, and the box body is filled with concrete. 2. The tread for indoor stairs according to claim 1, wherein a curved surface is formed between the nosing and the box bottom plate.