JP2004360392A - Concrete stairs - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide concrete stairs, easily manufacturable with bolts without performing joint work by forming no clearance between a tread and a riser of a concrete stairs block. <P>SOLUTION: In this concrete stairs, an L-shaped longitudinal cross section concrete stairs block 1 is integrally molded by a footboard 2 forming the tread 2a and a riser plate continuously forming the riser 3a upward from the tread 2a, and is fixed by the bolt 6 to a vertical part of an L-shaped longitudinal cross section block fixing member 9; a horizontal part of the block fixing member 9 is fixed by the bolt 10 to a block placing material 11 of an open string 8; and a level adjusting bolt 12 for adjusting a level of the concrete stairs block 1, is vertically movably threadedly engaged with a horizontal part of the block placing material 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete staircase formed by placing an L-shaped concrete staircase block having a vertical cross section integrally formed continuously from a tread surface on a block placing material of a slab and fixing it with bolts.
[0002]
[Prior art]
There is known a staircase in which an L-shaped concrete staircase block formed with a tread surface and a riser made of precast concrete is fixed to an inclined H-beam slab girder (see Patent Document 1).
[0003]
FIG. 4 is a view showing an example of a stair using a conventional concrete stair block. In FIG. 4, a tread plate 2 having a tread surface 2a and a riser plate 3 having a kick-up 3a formed downward from the back surface of the tread plate 2 are provided. The finished L-shaped concrete staircase block 14 is formed. At the time of molding, a welding piece 15 is embedded on the side of the concrete staircase block 14 fixed to the slab 8 to expose a welded portion.
[0004]
The block placing material 11 is fixed to the girders 8 by welding at intervals corresponding to the width of the tread 2 of the concrete staircase block 1. The welding piece 15 provided on the concrete staircase block 14 is placed on the block placing material 11, and the block placing material 11 and the welding piece 15 are welded and fixed. In this way, the riser 3 of the next concrete staircase block 1 is placed on the tread surface 2a of the concrete staircase block 1 fixed to the slab 18 and the welding piece 15 is placed on the block placing material 11 for welding. The gap 16 between the front step board 2 and the rear riser 3 placed on the front step board 2 is filled with a mortar joint 17. According to the above procedure, the concrete stairs are formed while the concrete stair block is fixed to the slab.
[0005]
[Patent Document 1]
JP-A-7-217136
[Problems to be solved by the invention]
In the conventional concrete stairs, there is a gap between the tread surface and the rise, so extra work is required to apply a mortar joint to the gap, and dust tends to accumulate in the mortar joint, and the mortar joint breaks. Water, etc., invaded the floor, and the back of the stairs became dirty.
[0007]
In addition, in the conventional concrete stairs, there is a work of welding the welding piece of the concrete stair block and the block placing material of the slab girder, so that preparation work for preparing a welding device and cleaning a welded portion is troublesome. Was hanging. Also, because the welding piece and the block placing material were fixed by welding, the level adjustment of the concrete staircase block could not be accurately performed in some cases.
[0008]
Accordingly, the present invention provides a concrete staircase which does not need to perform joint work so as not to form a gap between the tread surface of the concrete staircase block and the rise, and which can be easily manufactured with bolts.
[0009]
[Means for Solving the Problems]
The concrete staircase of the present invention is a concrete staircase block having an L-shaped vertical cross-section in which a tread plate having a tread surface and a riser plate having a riser continuously formed upward from the tread surface are integrally formed. The vertical portion of the block fixing member is fixed by bolts, and the horizontal portion of the L-shaped block fixing member is fixed to the block mounting material of the slab by bolts.
[0010]
In the above configuration, a level adjustment bolt for adjusting the level of the concrete stair block may be screwed into the horizontal portion of the block placing member so as to be vertically movable.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a side view of a concrete staircase of the present invention, FIG. 2 is a front view of a fixed portion of a block placing material and a concrete staircase block, and FIG. 3 is a plan view of the same. In the present invention, the concrete staircase block 1 is a concrete staircase block having an L-shaped vertical section in which a tread plate 2 having a tread surface 2a and a riser plate 3 having a riser 3a formed upward from the tread plate 2 are integrally formed. Become. Since the tread surface and the rise are continuous by this shape, no gap is formed at the boundary between the tread surface and the rise, so that a mortar joint is not required and there is no danger of flooding. In the concrete staircase block 1, reinforcing bars composed of the vertical bars 4 and the horizontal bars 5 of the PC steel bars are arranged in the same manner as in the known staircase block.
[0012]
At the time of molding the concrete staircase block 1, a bolt insertion tube 7 for inserting a bolt 6 from the outside of the riser plate 3 toward the tread plate 2 is embedded. The bolt insertion cylinder 7 can be easily embedded by arranging it in the mold when molding the concrete staircase block 1. A helical screw to be screwed with the screw of the bolt 6 is formed on the inner periphery of the hollow portion of the bolt insertion tube 7.
[0013]
The concrete staircase block 1 is fixed by screwing bolts 6 and bolts 10 to the concrete staircase block 1 and the block placing member 11 of the slab girder 8 via a block fixing member 9 having an L-shaped vertical section.
[0014]
The L-shaped block placing member 11 is fixed to the girders 8 by welding at intervals corresponding to the depth of the tread surface 2a of the concrete staircase block 1. A level adjusting bolt 12 is screwed up and down to the horizontal portion of the block placing member 11 so that the level of the concrete staircase block 1 can be adjusted by pushing up the concrete staircase block 1. Further, a bolt hole for inserting a bolt 10 for fixing the L-shaped block fixing member 9 is formed in a horizontal portion of the block placing member 11.
[0015]
A long hole 9 a through which a bolt 10 is inserted is formed in a horizontal portion of the L-shaped block fixing member 9, and the bolt 10 is inserted through the long hole 9 a and a bolt hole in the horizontal portion of the block placing member 11 via a washer 13. The block fixing member 9 is fixed to the block placing member 11 by being tightened with a nut. The position of the block fixing member 9 can be adjusted by forming the elongated hole 9a in the horizontal portion of the block fixing member 9.
[0016]
Further, a long hole 9b through which the bolt 6 is inserted is formed in a vertical portion of the L-shaped block fixing member 9, and the bolt 6 is inserted through the long hole 9b and the bolt insertion tube 7 of the concrete staircase block through the washer 13. The concrete staircase block 1 is fixed to the block fixing member 9 by being tightened. By forming the elongated hole 9b in the vertical portion of the block fixing member 9, the bolt 6 can be tightened according to the level of the concrete staircase block 1.
[0017]
Next, the procedure for assembling the concrete stairs of the present invention will be described. The end of the step board 2 of the concrete stair block 1 is supported on the upper surface of the riser plate 3 of the preceding concrete stair block 1, and the bottom surface of the riser plate 3 is placed on the horizontal portion of the block placing material 11 fixed to the slab 8.
[0018]
Next, the level adjusting bolt 12 in the horizontal portion of the block placing material 11 is moved up and down to push up the concrete staircase block 1 to adjust the level.
[0019]
When the level adjustment of the concrete staircase block 1 is completed, the vertical portion of the block fixing member 9 is brought into contact with the concrete staircase block 1, and then the bolt 6 is inserted through the slot 9 b through the washer 13, and the bolt of the concrete staircase block 1 is inserted. The screw 10 is screwed into the insertion tube 7 and tightened, and the bolt 10 is inserted through the long hole 9a of the horizontal portion of the block fixing member 9 and the screw hole of the block placing member 11 through the washer 13 and tightened to fix the block fixing member 9. I do.
[0020]
The above steps are repeated to assemble the concrete stairs.
[0021]
【The invention's effect】
According to the present invention, since the tread surface and the rise of the concrete stair block are continuously formed so that no gap is formed between the tread surface and the rise, there is no need for a mortar joint and there is no danger of flooding.
[0022]
Further, the level of the concrete stair block can be easily and accurately adjusted by the vertical movement of the level adjusting bolt.
[0023]
Further, since the concrete staircase block is fixed by tightening bolts, labor can be reduced as compared with the conventional welding.
[Brief description of the drawings]
FIG. 1 is a side view of a concrete staircase of the present invention.
FIG. 2 is a front view of a fixed portion between a block placing material and a concrete stair block.
FIG. 3 is a plan view of a fixed portion of the block placing material and the concrete stair block.
FIG. 4 is a view showing an example of a stair using a conventional concrete stair block.
[Explanation of symbols]
1: Concrete staircase block 2: Tread plate 2a: Tread surface 3: Rise plate 3a: Rise 4: Vertical streak 5: Horizontal streak 6: Bolt 7: Bolt insertion tube 8: Sasara girder 9: Block fixing members 9a, 9b: Slot 10 : Bolt 11: block placing material 12: level adjustment bolt 13: washer 14: concrete stair block 15: welding piece 16: gap 17: mortar joint

Claims (2)

An L-shaped concrete staircase block in which a tread plate forming a tread surface and a riser plate continuously forming an upward rise from the tread surface are integrally molded with concrete is a vertical L-shaped block fixing member. A concrete staircase, wherein the horizontal portion of the L-shaped block fixing member is fixed to the block mounting member of the slab by bolts. The concrete staircase according to claim 1, wherein a level adjusting bolt for adjusting a level of the concrete staircase block is screwed to a horizontal portion of the block placing member so as to be vertically movable.

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