JP2004232331A - Tread for prefabricated stairs - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tread for prefabricated stairs not only having light weight capable of easily carrying out prefabricated work to an open string even by a single person but also having excellence in decoration effect and durable strength. <P>SOLUTION: Right and left nuts (21), (23) each in pair, four in total are integrally embedded in a tread board (11) extrusion molded in a hollow flat board mode from an aluminum alloy to screw and fasten tension bolts (25) and (26) between both right and left nuts (21) and (23) in a cross state, a pair of right and left side cover plates (30) stuck with elastic sheet packings (39) are mounted and fixed to the tread board (11) from the lateral outside with tapping screws (31), (32) and (33) in a cross sectional state, and the tread board (11) is so positioned that it is mounted and fixed to a steel plate open string (47) with construction bolts (50) and (51) screwed and fastened to the nuts (21) and (23) from the lateral outside of the steel plate open string (47). <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a step board for an assembly stair.
[0002]
[Prior art]
One of the present inventors has previously proposed Japanese Patent Application Laid-Open No. Hei 7-197614 for a prefabricated step board for an assembly staircase suitable for an internal staircase or a particularly external staircase (emergency staircase) of various buildings and a construction method thereof.
[0003]
Since the prefabricated step board (S) of this known invention forms a separate and independent unit from the steel plate girders (21), the vertical interval (H) and the front-rear interval (H) of the adjacent prefabricated step boards (S) ( L) has the advantage that it can be adjusted freely on assembly at the construction site.
[0004]
[Problems to be solved by the invention]
However, according to the configuration of the above-described known invention, since the mortar (20) is filled in the box-shaped interior of the tread (11) formed from a steel plate, the weight of the prefabricated step board (S) becomes very large. In addition, the rise surface (12) rises from one side surface (rear surface) of the tread surface (11) continuously and integrally, so that it becomes extremely bulky, and as a result, transportation from the production factory to the construction site is inexpensive. In addition, there is a possibility that the kick-up surface (12) may be deformed or damaged during transportation or handling at a construction site.
[0005]
Also, in the factory production of the prefabricated step board (S), not only the overall plastic working from the steel sheet but also the welding operation of the nut (15) to the inside of the box-shaped tread (11) and the nut Since it is necessary to also perform the welding work of the reinforcing steel mesh (M) to the connection bolt (16) screwed and fastened to (15), it is still very cumbersome and exerts the mass production effect of the prefabricated step board (S). And difficulties in quality control.
[0006]
Furthermore, since the tread surface (11) and the rise surface (12) of the prefabricated step board (S) are in a bare state as a continuous integrated product from a steel plate, especially when applied to the external stairs (emergency stairs) of a building, such a step is particularly difficult. There is a possibility that rusting may occur early due to the fact that the inclined surface for draining is not formed on the tread surface (11), and the upper surface or the rising surface (12) of the mortar (20) forming the tread surface (11) may be formed. If the finishing material (25) such as a vinyl tile or a carpet is specially adhered to and integrated with the inner surface of (1), it is impossible to maintain the makeup effect.
[0007]
[Means for Solving the Problems]
The present invention intends to improve such problems, and as a construction of a step board for assembling stairs useful for that purpose, firstly, into a hollow interior of a tread board extruded into a hollow flat plate form from an aluminum alloy. , Integrally forming a pair of front and rear nut holding pockets and a plurality of tapping screw receiving pockets interposed between the front and rear,
[0008]
A pair of right and left nuts embedded and fixed inside each nut holding pocket are screwed together at both ends of a tension bolt crossing between the left and right sides,
[0009]
A pair of left and right side cover plates in which the assembling bolt insertion holes corresponding to the nut holding pockets and the tapping screw insertion holes corresponding to the tapping screw receiving pockets are distributed are provided. With a plurality of tapping screws screwed into the pocket for receiving the tapping screw from above, and attached and fixed to both left and right sides of the tread board in a covered state,
[0010]
Attach the elastic sheet packing to the outer surface of both side cover plates and integrate them,
[0011]
The treadboard is fixed to the girders by a plurality of assembling bolts which are screwed into the nuts from outside of the steel plate girders through the stud holes for inserting the bolts of the side cover plate from the lateral outside of the girders. It is characterized by that
[0012]
Secondly, it is composed of two pieces, a tread board extruded from an aluminum alloy into a hollow flat plate form, and a riser face plate extruded from the same aluminum alloy into a flat form thinner than the tread board,
[0013]
A pair of front and rear nut holding pockets and a plurality of tapping screw receiving pockets interposed between the front and rear inside the hollow inside of the tread board are integrally molded,
[0014]
A pair of right and left nuts embedded and fixed inside each nut holding pocket are screwed together with both ends of a tension bolt that crosses between the left and right,
[0015]
A pair of left and right side cover plates in which the assembling bolt insertion holes corresponding to the nut holding pockets and the tapping screw insertion holes corresponding to the tapping screw receiving pockets are distributed are provided. With a plurality of tapping screws screwed into the tapping screw receiving pocket from above, the lid is fixedly attached to both left and right sides of the tread board in a covered state,
[0016]
The elastic sheet packings are attached to the outer surfaces of both side cover plates, respectively, and integrated,
[0017]
By inserting and inserting the insertion leg of the mounting piece projecting forward from the mid-height position of the riser face plate into the catch hook for the riser face plate that protrudes from the rear surface of the tread board, the riser face plate is brought into contact with the tread surface. After assembling and integrating into a vertical state almost perpendicular to the board,
[0018]
The treadboard is fixed to the girders by a plurality of assembling bolts that are screwed into the nuts from the lateral outside of the steel plate girders, through the studs for inserting the bolts on the side cover plate, and then into the nuts. It is characterized by having.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the specific configuration of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 9 show a step board (S) for an assembling stair according to the present invention, which is a thick and highly rigid tread board (S). 11) and a riser face plate (12), which is thinner and flatter than the tread board (11), is assembled and used as two separate pieces, but may be used as one piece of the tread board (11) alone. .
[0020]
First, the tread board (11) has a constant effective depth length (L1) (for example, about 270 mm), a width (W1) (for example, about 1200 mm) and a thickness (T1) (for example, about 45 to 50 mm) as shown in FIGS. ) Is extruded from an aluminum alloy, and various colored colors such as bronze may be printed on the surface.
[0021]
More specifically, the tread board (11) has a substantially rectangular extruded cross-sectional shape when viewed from the side, and its upper surface (tread surface) (11a) is gently inclined forward with respect to the lower surface (11b). Has made. Moreover, on the tread surface (11a), the lower surface (11b) and the vertical front surface (11f), a number of ridges (13a) (13b) (13f) are arranged in parallel in the width direction (left-right direction). There are. It goes without saying that the ridge (13a) of the tread (11a) exerts a non-slip function on walking.
[0022]
(14) is a draining edge that hangs down from the front surface (11f) of the tread board (11). When used as a staircase (emergency stairs), it performs its draining action.
[0023]
(15) is a substantially L-shaped kick-up face plate receiving hook which projects rearward from the vicinity of the upper end of the vertical rear surface (11r) of the tread board (11), and is substantially the same as the tread (11a). It is open upward to the height position, so that a later-described insertion leg of the riser face plate (12) can be inserted and locked into the inside of the receiving hook (15) from above.
[0024]
Further, (16), (17), (18), and (19) are a plurality of (four in the illustrated example) vertical partition reinforcing walls interposed in parallel in the hollow interior of the treadboard (11). A mid-height position of the first partition reinforcing wall (16) that is biased to the foremost side is formed as a nut holding pocket (20), and a pair of left and right nuts (21) is inserted therein through an adhesive (not shown). ) Is embedded and fixed.
[0025]
Here, as the nut holding pocket (20) of the first partition reinforcing wall (16), there is no possibility that the nut (21) is exposed from the tread board (11). It is preferable to form a pair of upper and lower square plates that face each other so as to partially sandwich them, and to form cutouts on both front and rear surfaces. However, even if it is formed into a corresponding regular hexagonal cylindrical shape that surrounds the entire outer peripheral surface of the nut (21), it may be acceptable.
[0026]
(22) is a nut holding pocket formed at a halfway height position of the vertical rear surface (11r) of the tread board (11) as a pair of front and rear relations with the nut holding pocket (20). A pair of left and right nuts (23) are also embedded and fixed in the interior via an adhesive (not shown).
[0027]
The nut holding pocket (22) on the rear surface (11r) is different from the nut holding pocket (20) on the first partition reinforcing wall (16), and the nut (23) embedded therein is located rearward from the tread board (11). It has a pseudo-regular hexagon in which only the front surface is cut away to prevent exposure. However, this can also be formed into a corresponding regular hexagonal cylindrical shape surrounding the entire outer peripheral surface of the nut (23).
[0028]
Moreover, from the rear end portion where such a nut holding pocket (22) projects from the vertical rear surface (11r) of the tread board (11), a constant distance (D) (for example, about 10 mm) from the rear surface (11r). The draining skirt (24), which is kept parallel, continuously hangs down to the position where it reaches the lower surface (11b) of the tread board (11). Draining action can be performed.
[0029]
The left and right pairs of the nuts (21) and (23) are the same steel product having an entirely constant length (W2) (for example, about 45 mm). 5, the tension bolts (25) and (26) are screwed and fastened in a horizontal transverse state. A pair of nuts (21) and (23) screwed and fastened to both left and right ends of the tension bolts (25) and (26) are used in an extrusion molding factory for the tread board (11). The nut holding pockets (20) and (22) are embedded and fixed at both left and right end portions, respectively.
[0030]
A front tension bolt (25) crossing along the first partition reinforcing wall (16) of the tread board (11) and a rear tension crossing along the rear face (11r) of the tread board (11). The parallel pair with the bolt (26) can prevent stress and bending deformation concentrated on the tread board (11).
[0031]
The front and rear pairs of the tension bolts (25) and (26) are made of the same steel product. In the illustrated example, both of them are embodied as fully threaded bolts. good.
[0032]
Further, the second to fourth partition reinforcing walls (17), (18), (19) remaining in parallel between the front and rear sides of the first partition reinforcing wall (16) and the rear surface (11r) of the tread board (11). Each of the intermediate height positions is formed in a substantially C shape as a tapping screw receiving pocket (27), (28), (29). Although it may be possible to form the cylinder into a cylindrical shape instead of the C-shape, in any case, the plurality of tapping screw receiving pockets (27), (28) and (29) are alternately changed in height as shown in FIG. It is preferable to distribute as the installation height.
[0033]
Reference numeral (30) denotes a pair of left and right side cover plates formed as an aluminum alloy die-cast product in a contour shape substantially corresponding to the tread board (11) as shown in FIG. 6, and the tapping screw receiving pocket (27) ( A pair of tapping screws (31), (32), and (33), which are screwed and fastened from the lateral direction to 28) and (29), cover the left and right sides of the treadboard (11) as shown in FIGS. It is fixed in the state.
[0034]
(34) (35) (36) A plurality of (three in the illustrated example) tapping screw insertion staggered holes distributed in the openings of the side cover plates (30), and the second to fourth partition reinforcing walls. It goes without saying that the tapping screw receiving pockets (17), (18) and (19) correspond to the tapping screw receiving pockets (27), (28) and (29).
[0035]
(37) and (38) denote a pair of front and rear assembly bolt insertion holes formed in each of the side cover plates (30). The nut holding pockets (20) of the first partition reinforcing wall (16). ) And threaded holes of the nuts (21) and (23) embedded and fixed in the nut holding pockets (22) on the rear surface (11r), and receive assembly bolts to be described later with a girder.
[0036]
As shown in FIG. 5, (39) is a pair of left and right elastic sheet packings which are preliminarily adhered to the outer surface of the side cover plate (30) as shown in FIG. It performs a waterproofing action between the girders and an absorbing action such as vibrations and noises propagating from the treadboard (11) to the girders.
[0037]
Next, the riser face plate (12) is extruded from the same aluminum alloy as the tread board (11) into an extremely thin and flat shape as shown in FIGS. (H1) (for example, about 105 mm) and a plate thickness (T2) (for example, about 2 mm). Of the height (H1), the effective height (H2) of the tread board (11) vertically hanging from the tread (11a) is, for example, about 78 mm.
[0038]
Moreover, the mounting piece (40) to the tread board (11) from the mid-height position of the riser face plate (12), and the anti-sway restricting piece (41) to the tread board (11) from near the lower end. And a pair of upper and lower sides of the mounting plate (40) are extended in a substantially horizontal state facing forward, and an insertion leg (42) continuously hanging from the vicinity of the front end of the mounting piece (40) is attached to the step board (S) assembly factory. In FIG. 9, as shown in FIG. 9, when the tread board (11) is inserted from above into the catch hook (15) for the riser face plate and locked, the mounting piece (40) of the riser face plate (12) is attached to the tread board (11). In addition to being substantially flush with the tread surface (11a) of the tread plate (12), the steady rest (41) of the riser plate (12) is also connected to the rear surface (11r) of the tread plate (11) and the nut at an intermediate height. Lock to the corner with holding pocket (22) , So that the kept riser surface plate (12) itself to a stable assembled state of vertical standing posture substantially perpendicular to the tread surface plate (11).
[0039]
The lower end of the riser face plate (12) is further suspended as a drain edge (43) from the projecting position of the steady rest piece (41), while the upper end of the riser face plate (12) is also a parting edge (44). ) Is slightly thicker.
[0040]
Further, (45) is used for inserting a plurality of tapping screws having openings distributed at a constant pitch between the upper and lower portions of the mounting piece (40) and the steady rest restricting piece (41) in the riser face plate (12). A stapling hole, from which a tapping screw (46) is screwed into the rear surface (11r) of the tread board (11) and fastened, so that the assembled state of the riser face plate (12) with respect to the tread board (11) can be fixedly maintained. It has become.
[0041]
The riser face plate (12) is prepared as various specifications having only the effective height (H2) that changes in height, and can be used in combination with the common tread board (11). A large number of decorative holes (not shown) useful for lighting or ventilation may be distributed in the portion where only the vertical portion is vertical.
[0042]
The tread board (11) and the riser face plate (12) having the above-described configuration are transported from the extrusion molding factory to another assembly factory as two separate pieces, and are separated from each other at the assembly factory. S) and the step of assembling the step board (S) with respect to the steel plate girders (47) having a fixed unit length are performed. A).
[0043]
That is, in assembling the step board (S) from the tread board (11) and the riser face plate (12) as shown in FIG. 9, the insertion leg (40) of the mounting piece (40) in the riser face plate (12) is used. 42) is inserted from above into the catch hook (15) for the riser face plate of the treadboard (11) and locked, and the steadying piece (41) of the riser face plate (12) is also attached to the rear surface (11r) of the treadboard (11). In the positioning state in which the tapped plate (12) is screwed into the rear surface (11r) of the tread plate (11) from behind, the riser plate (12) is connected to the tread plate (11). ) May be fixedly maintained in an upright state substantially orthogonal to the above.
[0044]
In assembling such a step board (S) into a steel plate slab (47), screw holes of nuts (21) and (23) embedded and fixed in the tread board (11) are used. A pair of left and right sides of the sasara girder (47) in which opening bolt holes (48) and (49) corresponding to the assembly bolt insertion holes (37) and (38) of the side cover plate (30) correspond to each other. Is prepared, and the step board (S) is sequentially inserted and set between the left and right sides of the sasara girder (47).
[0045]
Then, while piercing the elastic sheet packing (39) of the tread board (11) from the stud holes (48) and (49) for inserting the assembly bolts of the sasara spar (47), the assembly bolt insertion of the side cover plate (30) is performed. The assembly bolts (50) and (51) are screwed into the nuts (21) and (23) of the tread board (11) through the stupid holes (37) and (38), respectively. And tighten it firmly.
[0046]
In this case, the tread plate (11) of the step plate (S) is formed by extrusion molding a hollow flat plate from an aluminum alloy, and the riser plate (12) is also extruded from the aluminum alloy into a thin flat shape. Since they are formed, one worker can assemble them into the step board (S) and assemble the step board (S) with the above-mentioned slab (47) lightly and efficiently. The unit stairs (A) in the form of a ladder as shown in FIGS. 10 to 13 can be mass-produced. The unit staircase (A) is provided with, for example, two step boards (S) for one floor.
[0047]
The step board (S) once finished in this way is continuously carried into the construction site from the assembly factory, and is attached and fixed to a frame of various buildings at the construction site in a connected state in which a desired height is added. The construction of the assembly stairs will be completed.
[0048]
In any case, the unit staircase (A) assembled and integrated from the step board (S) of the present invention has a pair of front and rear tension bolts (25) and (26) embedded and fixed in the hollow interior of the treadboard (11). As a result, despite being lightweight, stress and bending deformation concentrated on the tread board (11) can be effectively prevented, and the tread board (11) has a side cover plate (30). Due to the elastic deformation action of the elastic sheet packing (39) interposed between the steel plate and the girders (47), not only the waterproof effect as an external stair (emergency stairs) but also the girders from the treadboard (11) The effect of absorbing vibration and noise that propagates to (47) can also be achieved.
[0049]
In particular, the tread board (11) and the riser face plate (12) of the step board (S) according to the present invention are independent from each other, so that the riser face plate (12) whose effective height (H2) varies in height is different from the riser face plate (12). There is an advantage that the unit stairs (A) of various specifications can be obtained abundantly by the rearrangement use and the use of only the tread board (11) from which only the riser face plate (12) is removed.
[0050]
【The invention's effect】
As described above, in the step board (S) for assembling stairs according to the present invention, a pair of front and rear nut holding pockets (1) is inserted into the hollow interior of the tread board (11) extruded from an aluminum alloy into a hollow flat board form. 20) (22) and a plurality of tapping screw receiving pockets (27), (28), (29) interposed between the front and rear thereof, are integrally formed,
[0051]
A pair of right and left nuts (21) and (23) embedded and fixed in the respective nut holding pockets (20) and (22) are screwed with both ends of tension bolts (25) and (26) crossing between the left and right sides. While concluding,
[0052]
Assembly bolt insertion holes (37) (38) corresponding to the nut holding pockets (20) (22) and tapping screw insertion holes (27) (28) (29) corresponding to the tapping screw receiving pockets (27) (28) (29). The pair of left and right side cover plates (30) in which the holes (34), (35), and (36) are distributed through the openings are inserted through the tapping screw insertion fool holes (34), (35), and (36) into the pockets for receiving the tapping screws. 27) With a plurality of tapping screws (31), (32), and (33) screwed and fastened to (28) and (29), the tread board (11) is attached and fixed to both left and right sides of the tread board (11) in a cover state.
[0053]
Elastic sheet packings (39) are attached to the outer surfaces of both side cover plates (30), respectively, and integrated,
[0054]
The tread board (11) is passed from the lateral outside of the steel plate girders (47) to the nuts (21) and (23) through the stud holes (37) and (38) for assembling bolts of the side cover plate (30). Since it is determined that a plurality of assembly bolts (50) and (51) to be screwed and fastened are attached and fixed to the sparser girder (47), the problem of the prior art described at the beginning can be completely improved. .
[0055]
That is, according to the above configuration of the present invention, the tread board (11) of the step board (S) is extruded from an aluminum alloy in the form of a hollow flat board, and is lightweight, so that it can be made of a steel plate in an assembly plant. The assembly work with the girder (47) can be performed easily and efficiently by one person, which is useful for mass production of the unit stairs (A).
[0056]
Further, even if the tread board (11) is applied to an external staircase (emergency staircase), there is no risk of rusting at an early stage, and the elastic sheet packing ( 39), a waterproof effect and an effect of absorbing vibration and noise can be achieved.
[0057]
Further, although it is a lightweight product extruded from an aluminum alloy, a pair of left and right nuts (21) and (23) embedded and fixed in the nut holding pockets (20) and (22) inside the hollow, respectively. Since the tension bolts (25) and (26) are in a state of being screwed together with the tension bolts (25) and (26) crossing the space between the tension bolts (25) and (26), the tension bolts (25) and (26) can prevent stress or bending deformation concentrated on the tread board (11). It is possible, and there is no possibility that the durability is reduced.
[0058]
On the other hand, according to the step board (S) of claim 2, which is composed of the tread board (11) and the riser face plate (12), the two separate pieces are separated from each other and are separated from the extrusion molding plant by the unit step ( It can be lightly transported to the assembly factory of A) without being bulky, and there is no possibility that the above-mentioned riser face plate (12) may be deformed or damaged during transportation or during handling in the assembly factory. The work of assembling the step board (S) from the tread board (11) and the riser face plate (12) and the work of assembling the step board (S) with the slab girder (47) can be performed lightly and efficiently by one person. Because
[0059]
In any of the step boards (S) described in claims 1 and 2, if the configuration of claim 3 is adopted, there is a possibility that the durability of the tread board (11) may be reduced while the weight of the tread board (11) is reduced. This can be prevented by a plurality of vertical partition reinforcing walls (16), (17), (18), and (19) interposed in the hollow interior, and the partition reinforcing walls (16), (17), (18), and (19) are utilized. Thus, there is an effect that the nut holding pockets (20) and (22) and the tapping screw receiving pockets (27), (28) and (29) can be rationally formed.
[0060]
Similarly, if the structure of claim 4 is adopted, the surface can be dressed in a beautiful manner by the large number of ridges (13a), (13b), and (13f), and the invention can be applied to an external staircase (emergency staircase) of a building. In addition, the front draining edge (14) and the rear draining skirt (24) have an effect that the draining action can be performed by itself.
[0061]
Further, if the configuration of claim 5 is adopted, the step board (S) composed of the tread board (11) and the riser face plate (12) can be easily and correctly assembled, and the assembled state is fixed stably. There is an effect that can be maintained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a tread board of a step board for an assembly staircase according to the present invention.
FIG. 2 is an enlarged side view of FIG.
FIG. 3 is a sectional view taken along line 3-3 in FIG.
FIG. 4 is a side view corresponding to FIG. 2 and showing a state of attachment of a side cover plate to a tread board.
FIG. 5 is a sectional view corresponding to FIG. 3 and showing a finished state of the tread board.
FIG. 6 is a side view showing a side cover plate extracted.
FIG. 7 is a perspective view showing a riser face plate.
FIG. 8 is an enlarged side view of FIG. 7;
FIG. 9 is a side sectional view showing an assembled state of a step board composed of a tread board and a riser face board.
FIG. 10 is a side sectional view showing an assembled state of a unit stair including a step board of the present invention.
11 is a partially enlarged sectional view taken along line 11-11 of FIG.
FIG. 12 is a partially enlarged sectional view taken along line 12-12 of FIG. 10;
FIG. 13 is a partially enlarged sectional view taken along line 13-13 of FIG. 10;
[Explanation of symbols]
(11) tread board (11a) tread (top)
(11b) ・ Bottom surface (11f) ・ Front surface (11r) ・ Rear surface (12) ・ Rising surface plate (14) ・ Draining edge (15) ・ Receiving hook for rising surface plate (16) ・ First partition reinforcing wall (17) ・ No. 2 partition reinforcing wall (18), 3rd partition reinforcing wall (19), 4th partition reinforcing wall (20) (22), nut holding pockets (21) (23), nut (24), drain skirt (25) ( 26) Tension bolts (27) (28) (29) Tapping screw receiving pocket (30) Side cover plates (31) (32) (33) Tapping screws (34) (35) (36) Tapping Fool holes for screw insertion (37) (38), fool holes for assembling bolts (39), elastic sheet packing (40), mounting pieces (41), anti-sway regulating pieces (42), insertion legs (43), drainers edge( 4) ・ Parting edge (45) ・ Fap hole for tapping screw insertion (46) ・ Tapping screw (47) ・ Sasara girder (48) (49) ・ Fool hole for assembly bolt insertion (50) (51) ・ Assembly bolt ( A) · Unit stairs (S) · Step boards

Claims (5)

A pair of front and rear nut holding pockets (20) and (22) and a plurality of tapping screw receiving pockets interposed between the front and rear nuts (20) and (22) are inserted into the hollow inside of the treadboard (11) extruded from an aluminum alloy into a hollow flat plate. 27), (28) and (29) are integrally molded,
A pair of right and left nuts (21) and (23) embedded and fixed in the respective nut holding pockets (20) and (22) are screwed with both ends of tension bolts (25) and (26) crossing between the left and right sides. While concluding,
Assembly bolt insertion holes (37) (38) corresponding to the nut holding pockets (20) (22) and tapping screw insertion holes (27) (28) (29) corresponding to the tapping screw receiving pockets (27) (28) (29). The pair of left and right side cover plates (30) in which the holes (34), (35), and (36) are distributed through the openings are inserted through the tapping screw insertion fool holes (34), (35), and (36) into the pockets for receiving the tapping screws. 27) With a plurality of tapping screws (31), (32) and (33) screwed and fastened to (28) and (29), the tread board (11) is attached and fixed to both left and right side surfaces of the tread board (11) in a covered state.
Elastic sheet packings (39) are attached to the outer surfaces of both side cover plates (30), respectively, and integrated,
The tread board (11) is passed from the lateral outside of the steel plate girders (47) to the nuts (21) and (23) through the stud holes (37) and (38) for assembling bolts of the side cover plate (30). A step board for an assembling staircase, wherein a plurality of assembling bolts (50) and (51) to be screw-fastened are fixed to be attached to the girders (47). It consists of two pieces: a tread board (11) extruded from aluminum alloy into a hollow flat plate form, and a riser face plate (12) extruded from the same aluminum alloy into a flat form thinner than the tread board (11). ,
A pair of front and rear nut holding pockets (20) and (22) and a plurality of tapping screw receiving pockets (27), (28) and (29) interposed between the front and rear are integrally formed in the hollow inside of the tread board (11). And
A pair of right and left nuts (21) and (23) embedded and fixed in the respective nut holding pockets (20) and (22) are screwed with both ends of tension bolts (25) and (26) crossing between the left and right sides. To conclude,
Assembly bolt insertion holes (37) (38) corresponding to the nut holding pockets (20) (22) and tapping screw insertion holes (27) (28) (29) corresponding to the tapping screw receiving pockets (27) (28) (29). The pair of left and right side cover plates (30) in which the holes (34), (35), and (36) are distributed through the opening are inserted into the tapping screw receiving pockets (27) through the tapping screw insertion holes (34), (35), (36). ) A plurality of tapping screws (31), (32) and (33) screwed into (28) and (29) are attached and fixed to both left and right sides of the treadboard (11) in a covered state.
The elastic sheet packings (39) are attached to the outer surfaces of both side cover plates (30), respectively, while being integrated.
A catch for a riser face plate that protrudes from the rear surface (11r) of the tread board (11) with the insertion leg (42) of the mounting piece (40) projecting forward from the mid-height position of the riser face plate (12). By being inserted into the hook (15) and locked, the riser face plate (12) is assembled and integrated in an upright state substantially orthogonal to the tread board (11).
The tread board (11) is passed from the lateral outside of the steel plate slab (47) to the nuts (21) and (23) through the stud holes (37) and (38) for inserting the assembly bolts of the side cover plate (30). A step board for an assembling staircase, wherein a plurality of assembling bolts (50) and (51) to be screw-fastened are fixed to be attached to the girders (47). The cross-sectional shape of the tread board (11) is substantially rectangular in a side view, and a plurality of vertical partition reinforcing walls (16), (17), (18), and (19) are interposed inside the hollow, and
The mid-height position of the partition reinforcing wall (16) and the mid-height position of the rear surface (11r) biased to the foremost side are defined as a pair of front and rear nut holding pockets (20) and (22) for the nuts (21) and (23). While shaping into a shape that can be held,
The intermediate height position of the partition reinforcing walls (17), (18), (19) remaining between the front partition reinforcing wall (16) and the rear surface (11r) is determined by a plurality of tapping screw receiving pockets (27) ( The step board for an assembling stair according to claim 1 or 2, wherein the step board (28) is formed into a contour shape capable of receiving the tapping screws (31), (32) and (33). The extrusion cross-sectional shape of the treadboard (11) is substantially rectangular in a side view, and a number of ridges (13a) (13b) (13f) are arranged in rows on the tread (11a), the lower surface (11b), and the front surface (11f). ,
While the lower end of the front surface (11f) protrudes as a draining edge (14), the draining skirt (24) keeps a fixed distance (D) from the nut holding pocket (22) on the rear surface (11r) to the rear surface (11r). ) In parallel,
3. A step board for an assembling stair according to claim 1, wherein a substantially L-shaped catching hook (15) for a riser face plate projects rearward from an upper end portion of the rear surface (11r). An anti-sway regulating piece (41) substantially parallel to the mounting piece (40) projects forward from near the lower end of the riser face plate (12), and the anti-sway restricting piece (41) is attached to the rear surface (11r) of the treadle (11). )
A plurality of tapping screw insertion holes (45) distributed between the upper and lower portions of the mounting piece (40) and the steady rest piece (41) are tapped to the rear surface (11r) of the tread board (11). 3. The step board for an assembling stair according to claim 2, wherein the screw (46) is screwed and fastened to fix the assembled state of the riser face plate (12) with respect to the tread board (11).

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