JP2511062Y2 - Stairs for temporary scaffolding - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stairway for temporary scaffolding, which is temporarily installed as a staircase for civil engineering or construction work.

[0002]

2. Description of the Related Art A stairway for scaffolding of this kind has a plurality of treads arranged between a pair of left and right pillars, and the left and right end faces of each tread are respectively attached with bolts or the like. It is fixed to each inner surface.

When storing and transporting such stairs, a plurality of stairs are placed side by side so that they are not as bulky as possible, but the width of the tread is set between the left and right column members so that the stacking height does not become large. It is set slightly smaller than the interval.

Generally, as shown in FIG. 6, a washer 3 is interposed between each inner side surface of the left and right column members 1, 1 and both end surfaces of the tread 2 to fix the both members 1 and 2 with bolts 4. is there. That is, by interposing the washer 3, the interval between the pillars 1 and 1 is made larger than the width of the tread 2 so that a plurality of things can be stacked in close contact with each other, and the stacking height during storage and transportation can be reduced. There is. Normally, however, four washers 3 are required for each tread, because the tread is bolted at two locations on each side, and this complicates the assembly work.

For this reason, conventionally, as shown in FIG. 7, instead of using the washer 3, bulging portions 5 are formed by burring at the bolt insertion hole portions on both side end surfaces of the tread 2 to thereby improve the assemblability. Improvements have been proposed.

[0006]

However, in the conventional one shown in FIG. 7, since the bulging portion 5 is formed on each tread 2 by burring, it takes time to process. That is, one tread 2 which is used more than one
The above-mentioned burring process must be applied one by one. When processing is performed twice on both end faces of one tread plate, for example, when seven tread plates 2 are used, the number of burring processes reaches 14, resulting in poor production efficiency.

The present invention has been made in order to solve the problems of the above-mentioned conventional ones, and it is easy to assemble and needless to say, it is possible to increase the productivity by reducing the number of burring processes. The purpose is to provide stairs for scaffolding.

[0008]

In order to achieve the above-mentioned object, the present invention, if indicated by reference numerals in the drawings , is an inner side surface which is a side surface of a pair of left and right pillar members 1, 1 facing each other. 1a,
Left and right end faces 2a, 2a of the plurality of treads 2 with respect to 1a
In the stairway for temporary scaffolding in which the bolts 4 are respectively fixed, the inner surface 1a of the pillar 1 faces the end surface 2a of the tread 2 around the hole of the bolt insertion hole 5 formed in each of the pillars 1. In this configuration, the annular bulging portion 6 is formed so as to project.

[0009]

In the present invention, the left and right end surfaces 2a, 2a of the plurality of treads 2 are inserted through the bolt insertion holes 5 of the respective pillar members 1 with respect to the inner side surfaces 1a, 1a of the pair of left and right pillar members 1, 1. When the bolts 4 are fixed with the bolts 4, the annular bulging portion 6 projecting from the inner surface 1a of the pillar member 1 makes the interval between the pillar members 1, 1 larger than the width of the tread 2, and stores a plurality of things. In this case, it is possible to stack the sheets in a close contact state without making them bulky.

Further, since no washer is used, the labor for assembling is eliminated. Particularly, in the present invention, since the annular bulging portion 6 is formed on the side of the pillar material 1, when the bulging portion 6 is formed by burring processing which is easy to process, one pillar material 1 is used. Since the required number of annular bulging portions 6 can be formed at the same time, the bulging portions 6 can be formed on the left and right column members 1 and 1 by two times of machining, and the bulging portion can be formed on the tread 2 side. Compared with this, the number of steps can be reduced significantly. Further, since the bulging portion 6 is formed around each bolt insertion hole 5 formed in the pillar material 1, the bulging portion 6 is formed at a position different from the bolt insertion hole 5. Compared to the above, the machining is much simpler and easier, and especially when the burring process is performed, the bolt insertion hole 5 and the bulging portion 6 can be formed at the same time.
The number of steps can be further reduced, and the productivity can be significantly improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a column member used in a stairway for temporary scaffolding according to an embodiment of the present invention, and FIG. 2 is a line II of FIG.
It is a sectional view taken along the line II. In these figures,
The same parts as those of the conventional one shown in FIG. 7 are designated by the same reference numerals and the description thereof will be omitted.

In FIGS. 1 and 2, a pillar material 1 made of an extruded material such as an aluminum alloy material is provided with a plurality of, for example, seven treads 2 in order to bolt two parts on one side to each other. Two bolt insertion holes 5 and 5 are formed at seven locations in the direction. Around the hole of each bolt insertion hole 5 of the pillar material 1, an annular bulging portion 6 that protrudes from the inner side surface 1a of the pillar material 1 to face the end surface 2a of the tread plate 2 is formed by burring. Has been done. FIG.
Inside, 7 and 7 are bolt insertion holes which are formed at both ends of the column member 1 and through which the fixing holt 9 (FIG. 3) of the hook member 8 is inserted.

In order to manufacture the stairs for temporary scaffolding of this embodiment, an extruded material of aluminum alloy is cut to prepare a pair of left and right column members 1 and 1 having a predetermined length, and bolts are inserted into each column member 1. The holes 5 and 7 are formed, and the bolt insertion holes 5 of the pillar 1 are
The bulging portion 6 is formed by burring around the hole . Fourteen bulges 6 are formed for each pillar material, but these are simultaneously formed by one burring process.

Separately, seven prepared treads 2 are respectively attached to the pair of pillar members 1 and 1 by using bolts 4 and nuts (not shown) at two positions on one side as shown in FIGS. 3 and 4. Install. Further, hook members 8 are attached to both ends of each pillar 1 with bolts 9 and nuts 10. This completes the assembly of the temporary scaffolding stairs 100.

The staircase 100 for temporary scaffolding is used as a staircase by hooking and fixing the hook member 8 on a horizontal pipe such as a scaffolding frame for temporary construction. When transporting or storing a plurality of stairs 100, they are stacked side by side as shown in FIG. At this time, since the interval between the left and right pillars 1, 1 is set larger than the width of the tread 2 by the bulging portion 6 on the side of the pillar 1, as shown in FIG. By inserting and stacking between the pillar materials 1 and 1 of the stairs 110, the respective stairs 100 are brought into close contact with each other, and the stacking height H can be suppressed to be small.

Here, the interval between the left and right pillar members 1, 1 is set to be larger than the width of the tread 2 by the bulging portion 6 so that a plurality of stairs 100 can be stacked in close contact with each other. Since the bulging portion 6 is formed on the side of the pillar material 1 in particular, the bulging portion 6 is formed on the side of the pillar material 1, so that the number of bulging portions 6 corresponding to the number of the treads 2 is processed once with one pillar material. Therefore, the number of times of machining is significantly reduced as compared with the case where the bulging portion is formed on the tread 2 side, and the production efficiency is improved.

The number of the treads 2 can be increased or decreased as appropriate, and the bulging portion 6 is not limited to burring and any processing method capable of simultaneously forming a plurality of bulging portions 6 may be used.

[0019]

As described above, according to the present invention, the pillar material is provided around the holes of the respective bolt insertion holes of the pair of pillar materials to which the plurality of foot boards are fixed by bolts so as to face the end surface of the foot board. Since the annular bulging portion projecting from the inner side surface is formed, it is possible to easily assemble without using a washer and obtain a stairway for temporary scaffolding in which a plurality of things can be stacked in a close contact state. In particular, by forming the bulging portion on the side of the column member, the number of times the bulging portion is processed can be reduced, which can contribute to improvement in productivity. That is, when the bulging portion is formed by a burring process which is easy to process, a required number of annular bulging portions can be simultaneously formed on one column member, so that the column member can be formed twice on both the left and right column members. The bulged portion can be formed by the number of times of processing, and the number of steps can be significantly reduced as compared with the case of forming the bulged portion on the tread side. Further, since the bulging portion is formed around each bolt insertion hole formed in the pillar material, the bulging portion is formed in comparison with the bulging portion formed at a position different from the bolt insertion hole. Therefore, the machining becomes much easier, especially when the burring process described above is performed, it is possible to form the bolt insertion hole and the bulging portion at the same time, and it is possible to further reduce the man-hour. It is possible to significantly improve the sex.

[Brief description of drawings]

FIG. 1 is a side view showing a pillar member in a stairway for temporary scaffolding according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a side view of the stairs for temporary scaffolding according to the embodiment in an assembled state.

FIG. 4 is a front view of a part of the stairs for temporary scaffolding according to the embodiment.

FIG. 5 is an explanatory diagram of a stacked state of the stairs for temporary scaffolding in the example.

FIG. 6 is an explanatory sectional view showing a conventional example.

FIG. 7 is an explanatory sectional view showing a conventional example.

[Explanation of symbols]

 1 pillar material 1a inner surface of pillar material 2 tread plate 2a end surface of tread plate 4 bolt 5 bolt insertion hole 6 bulging part

Claims (1)

(57) [Scope of utility model registration request] 1. A stairway for temporary scaffolding, wherein left and right end faces of a plurality of treads are respectively fixed to inner side faces of a pair of left and right column members facing each other by bolts, in each of the above column members. A stairway for temporary scaffolding, characterized in that an annular bulge is formed around the hole for the bolt insertion hole formed in the above so as to project from the inner surface of the pillar material so as to face the end surface of the tread.