JPH0437901B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a so-called assembled staircase.

Conventional technology In contrast to ordinary stairs, which are constructed by processing building materials at the construction site, girder materials, tiers, and various other structural members prefabricated at a factory are transported to the construction site. Stairs that are assembled in a knock-down manner are generally referred to as assembled stairs.

Conventionally, this type of assembled staircase has been constructed by protruding a plurality of tread support brackets in an inclined manner from a girder extending between the upper and lower floors, as described in, for example, Japanese Utility Model Publication No. 4511/1983. There is a structure in which the step plates are attached to the tips of these step plate support brackets.

Problems to be Solved by the Invention In the above-mentioned prior art, a girder is constructed by arranging two girder members each having a rectangular cross-section facing each other, and the step plate support bracket is inserted between both girder members. I'm trying to hold it in place. In this case, if the thickness of the girder member is made small, the supporting force against the load in the lateral direction becomes weak, and there is a problem in that it causes lateral sway when going up and down. On the other hand, if the thickness of the girder member is increased, the weight of the girder member increases accordingly, and there is a problem in that each part must be strengthened to ensure sufficient strength.

Means for Solving the Problems The present invention has been made in order to solve these problems, and a plurality of strip members 7, 7... are attached in the longitudinal direction of the girder 1 to form a step plate. 20,
In the assembled staircase supporting 20..., the cross-sectional shape of the two girder members 2, 2 constituting the girder material 1 is an angular shape bent at a substantially right angle,
The vertical pieces 3a, 3a of these girder members 2, 2 oriented in the vertical direction are arranged to face each other, and the above-mentioned rib members 7, 7... are inserted and supported between both the vertical pieces 3a, 3a. Embodiment characterized by the above In FIG. 2, reference numeral 1 denotes a beam member according to the present invention, which has a structure in which a pair of beam members 2, 2 are arranged in parallel on the left and right sides. As shown in FIG. 1, each girder member 2 has a cross-sectional shape bent at a substantially right angle.
It is formed in a so-called angle shape, with the vertical piece 3a oriented vertically upward, and the horizontal piece 3b
is oriented in the horizontal direction from the lower end portion of the vertical piece 3a. Both girder members 2, 2 are arranged such that the vertical pieces 3a, 3a face each other. That is, the girder member 1 formed in this way is arranged in a roughly inverted T-shape with the horizontal pieces 3b, 3b of both girder members 2, 2 as the bases. Bolt holes 4, 4 are provided in communication with each other between the opposing vertical pieces 3a, 3a, respectively, and these bolt holes 4, 4 extend in the longitudinal direction of the girder members 2, 2. They are placed at intervals.

As shown in FIG. 3, the girder 1 is installed in an inclined manner on the upper and lower floors, and its upper end is connected to the beam 5 on the upper floor through a connecting bracket 6. At the same time, the lower end side is also connected via a connecting bracket 6 to the beam member 5 in the downstairs section.

On the other hand, 7 is a hanging member attached to the beam member 1. This ribbed member 7 has a structure in which a plate-shaped member is bent into an angle shape within its plane, and one of two branches extending from the bending substrate portion 8 in a substantially perpendicular direction in a bifurcated shape. The stepped plate receiving part 9 is used as the step plate receiving part 9, and the other part is used as the connecting support part 10. Bolt holes 11 are drilled through the bent plate portion 8 at the bases of the stepped plate receiving portions 9 and the connecting support portion 10 on the left and right sides. Therefore, this refractive substrate part 8 is connected to the beam member 1.
As shown in FIG. 2, insert the fastening bolt 12 into the bolt holes 4, 11, 4 from the side of one vertical piece 3a, A nut 13 is screwed onto the vertical piece 3a to fasten it. At this time, the stepped plate receiving part 9 is arranged so as to protrude substantially horizontally forward from the refraction substrate part 8, and the connecting support part 10 is arranged so as to protrude substantially vertically upward. A connecting piece 14 projecting upward is attached to one side wall portion of the upper end 10a of the connecting support portion 10, and a bolt hole 15 is bored in the left-right direction. Then, the connecting bolt 17, which has passed through the bolt hole 16 drilled near the tip of the step plate receiver 9 of the adjacent strip member 7, is inserted into this bolt hole 15, and the connecting bolt 17 is inserted into the tip side of the connecting bolt 17. The nut 18 is tightened to connect the adjacent rib members 7, 7 together. At that time, it is desirable to attach the step plate receiving part 9 of the other plate member 7 to the upper end 10a of the connecting support part 10.

In addition, after bending the upper end part of the connection support part 10 laterally, it may be further bent upward, and the part corresponding to the said connection piece 14 may be integrally formed. In that case as well, at the upper end of the main body part of the connection support part 10,
It is desirable to attach it so that the other ribbed member 7 rides on it.

By sequentially repeating such operations, a plurality of rib members 7, 7... are connected to the girder 1 in a stair-like manner from the lower floor to the upper floor, as shown in FIG. It turns out. That is,
Depending on the number of steps of the stairs, a plurality of hanging members 7, 7...
By connecting the generally called stringer 1
9 is constructed. Typically, such stringers 19 will also be provided on the other side of the staircase.

Next, the stringer 1 configured as above
The structure for attaching the step plate 20 to the step plate 9 will be explained.

A step plate fixing bolt 21 that protrudes upward is integrally attached to the front end of the step plate receiving portion 9 of the ribbed member 7, and another step plate fixing bolt 21 that similarly projects upward is attached to the side surface on the proximal end side. A step plate fixing bolt 22 is provided.

On the other hand, a non-slip mounting groove 23 is provided on the upper surface of the front edge 20a of the stepped plate 20 along the front edge 20a.
is formed. A stepped concave hole 25 into which a fixing nut 24 paired with the step plate fixing bolt 21 is inserted is opened in the non-slip mounting groove 23. Further, on the lower surface of the stepped board 20, a riser mounting groove 26 is provided in parallel to the front edge 20a. A similar riser plate attachment groove 27 is also formed on the upper surface of the step plate 20 on the rear edge 20b side, and the riser plate attachment groove 27
A stepped recess 29 is also formed inside, into which a fixing nut 28 that pairs with the step plate fixing bolt 22 on the base end side of the step plate receiving portion 9 is inserted.

Note that the upper part of the front edge 20a of the step board 20 is rounded in consideration of safety during lifting and lowering.

Then, the stepped plate 20 having the above structure is attached to the stringer 19 in the following manner.

First, the step plate 20 is placed on the step plate receiving portion 9 of the ribbed member 7 attached to the beam member 1, and both step plate fixing bolts 21 and 22 are projected into the stepped recessed holes 25 and 29, respectively. and fixing nut 2 from above.
4 and 28 to fix it. Note that if a cut groove 30 is provided in the step board 20 in correspondence with the above-mentioned ribbed member 7, when the step board 20 is installed, the step plate receiving portion 9 and connection of the ribbed member 7 are inserted into the cut groove 30. Support part 1
0 will enter and be held securely.

In parallel with this work, create a riser mounting groove 27 on the lower surface of the rear edge 20b of the lower tier board 20, and a riser mounting groove 26 on the lower surface of the front edge 20a of the tier board 20.
A riser board 31 is fitted and fixed between the two.

Next, the non-slip 32 is installed in the non-slip mounting groove 23, and the threaded end of the stepped board fixing bolt 21 exposed in the stepped concave hole 25 in the non-slip mounting groove 23 and the fixing nut 24 are attached. cover up.

Repeating such work, the step plates 20, 20...
. . . and risers 31, 31 . . . are assembled one after another.

In addition, 33 shown in FIG. 1 is a decorative border that covers the outer end side of the hanging member 7 and the stepped board 20.

By the way, the fire resistance of staircases in houses is currently a problem, but if the inside of the step board 20 is made of non-combustible material and then covered with a decorative material, it can be made to have a non-combustible structure. , it is possible to obtain a structure with excellent fire resistance that complies with the simple fire resistance structure (so-called simple fire resistance) of the Building Standards Act.

In addition, when using it as a temporary staircase during construction, separately prepared temporary steps are attached to the stringer girder 19, which is constructed by attaching the stringer members 7, 7... to the stringer material 1, and when the construction is completed, these temporary steps are The step board is removed and the step board 20 and riser board 31 are sequentially attached as in the embodiment shown in FIG. Therefore, the finishing steps 20 will not be damaged before the construction is completed. Furthermore, at the construction site, only component parts such as the girder member 2, flat member 7, tier board 20, riser board 31, etc. that are manufactured to predetermined dimensions at a factory etc. are assembled, so even an amateur can use the assembly instructions. You can assemble it in a short time by referring to it. Furthermore, since these structural members are basically tightened with bolts and nuts, even if the step plate 20 is damaged or needs to be replaced due to long-term use, it can be easily replaced.

Effects of the Invention As described above, the present invention provides an assembled staircase in which a plurality of rib members are attached in the longitudinal direction of a girder to support a tread.
The cross-sectional shape of the book girder member is bent at a substantially right angle, and the vertical pieces of both girder members are arranged to face each other,
Since the above-mentioned strip member is inserted and supported between both vertical pieces, both remaining horizontal pieces of both girder members are arranged in an inverted T-shape, for example, so that both girder members are The girder material constructed in this way has a structure that can sufficiently withstand lateral loads, effectively preventing lateral shaking, and by making the stringer members angular as described above, the stringer members Since the strength itself is increased, it becomes possible to manufacture the hanging member from a lighter material, which has the advantage of reducing manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing one embodiment of the present invention, FIG. 2 is an exploded perspective view of an assembled staircase, and FIG. 3 is an overall side view. 1... Girder material, 2... Girder member, 3a... Vertical piece, 3b...
Horizontal piece, 7...Sasara member, 20...Step board.

Claims (1)

[Claims] 1. In an assembled staircase in which a plurality of rib members are attached in the longitudinal direction of the girder material to support the treads, the cross-sectional shape of the two girder members constituting the girder material is an angular shape bent approximately at right angles. An assembled staircase characterized in that the vertical pieces of both the girder members are arranged to face each other, and the above-mentioned rib member is inserted and supported between the two vertical pieces.