JP7092726B2 - Prefabricated stairs - Google Patents

Description

The present invention relates to, for example, a prefabricated staircase that can be easily attached to and used on an inclined surface such as a mountain trail or a construction site in a mountainous area.

In addition to the conventional prefabricated stairs that are not provided with handrails (see Patent Document 1), handrails that are installed in places where the body of a person climbing the stairs becomes unstable without the handrails. (See FIG. 7 and the like in Patent Document 2).

5 and 6 are views for reference to illustrate the conventional prefabricated staircase 2 with such a handrail.

As shown in FIGS. 5 and 6, the conventional prefabricated staircase 2 has two rod-shaped members 4 provided on the inclined surface 3 and a plurality of rod-shaped members 4 arranged side by side in a staircase pattern on the rod-shaped members 4. The step member 6 is provided, a plurality of columns 8 provided on both sides of the step member 6 (both left and right sides in FIG. 6), and a plurality of handrail members 10 provided so as to connect the upper ends of the plurality of columns 8. rice field.

Each of the rod-shaped members 4 of the conventional prefabricated stairs 2 is formed in an elongated square rod shape, and as shown in FIG. 5, extends along the inclination direction (from the upper left to the lower right in the figure) on the inclined surface 3. As shown in FIG. 6, the two rod-shaped members 4 are arranged parallel to each other at a predetermined interval in the direction perpendicular to the length direction (left-right direction in the figure). rice field.

Then, the upper end portion of the anchor bolt 5 whose lower end portion is driven into the ground of the inclined surface 3 is inserted into the through hole formed in the middle portion of the length of the rod-shaped member 4 and penetrating the rod-shaped member 4 in the thickness direction. A pair of nuts N are screwed to the male threaded portion formed at the upper end of the anchor bolt 5 so as to sandwich the rod-shaped member 4 from both the front and back sides in the thickness direction, so that each rod-shaped member 4 is inclined. It was fixed to surface 3.

Further, as shown in FIG. 5, the step member 6 of the conventional prefabricated staircase 2 is integrally formed with the tread 6a arranged substantially horizontally and the tread 6a, and is formed from the lower surface of the tread 6a to the tread 6a. A rise plate 6b arranged substantially vertically is provided, and a predetermined height is provided upward at the end of the step member 6 on the inclined surface 3 side (left side in the figure) in the width direction (left and right direction in the figure) of the step member 6. The mounting plate portion 6c to be provided was integrally formed with the tread plate 6a.

Then, the lower end of the riser plate 6b of the step member 6 in which such a step member 6 is arranged on the upper side (upper left side in FIG. 5) is on the lower side (lower right side in the figure) of the step member 6. The other step member 6 is arranged so as to be in contact with the upper surface (tread surface) of the tread 6a and the side surface (rising surface) on the opposite side (right side in the figure) of the inclined surface 3 of the mounting plate portion 6c. Therefore, they were arranged side by side in a staircase pattern.

The plurality of step members 6 arranged in a stepped manner in this way penetrate the riser plate 6b of the step member 6 on the upper stage side and the mounting plate portion 6c of the step member 6 on the lower stage side in a substantially horizontal direction (FIG. They were connected to each other by the nail members 12 driven in the middle left and right directions.

Further, each step member 6 is formed into a rod shape by a nail member 14 driven in a direction substantially perpendicular to the length direction of the rod-shaped member 4 toward the rod-shaped member 4 from the vicinity of the mounting plate portion 6c on the upper surface of the tread plate 6a. It was fixed to the member 4.

Then, as shown in FIG. 5, the pile 16 is driven substantially vertically into the ground of the inclined surface 3 on the lowermost side (lower right side in the figure) of the plurality of step members 6 arranged in a staircase pattern. By arranging the lower end portion of the rod-shaped member 4 and the riser plate 6b of the step member 6 in contact with the upper end portion of 16, the rod-shaped member 4 and the step member 6 are brought into contact with earth pressure, the force of water flow during rainfall, and the like. In response to this, the inclined surface 3 was firmly supported so as not to move downward in the inclined direction.

In this way, by arranging and fixing the plurality of step members 6 in a staircase pattern along the inclined direction on the rod-shaped member 4 arranged on the inclined surface 3, the unevenness of the inclined surface 3 is formed. It was possible to install the step member 6 without being directly affected by the above.

Further, each of the columns 8 of the conventional prefabricated staircase 2 is formed in an elongated cylindrical shape, and as shown in FIG. 6, the length direction from both ends of the step member 6 in the length direction (left-right direction in the figure). A plurality of columns 8 are erected substantially vertically on the outside of the stairs at a position slightly distant from each other, and a plurality of columns 8 are provided in the traveling direction of the stairs (vertical direction in the figure) on both sides of the step members 6 connected in a staircase shape in the length direction. They were arranged so as to be lined up at predetermined intervals along the line.

Then, as shown in FIGS. 5 and 6, most of the lower ends of the respective columns 8 are arranged inside the substantially cylindrical steel pipe 18 buried in the ground of the inclined surface 3 except for the opened upper ends. At the same time, the mortar 20 was filled in the gap between the inner peripheral surface of the steel pipe 18 and the outer peripheral surface of the support column 8 to be fixed to the inclined surface 3.

The handrail members 10 of the conventional prefabricated stairs 2 are each formed in the shape of an elongated square bar, and are provided so as to connect the upper ends of adjacent columns 8 of a plurality of columns 8 arranged along the traveling direction of the stairs. Was there.

By the way, in such a conventional prefabricated staircase 2, as shown in FIG. 5, since the support column 8 is fixed to the inclined surface 3, the unevenness of the inclined surface 3, particularly the inclined surface 3 and the rod-shaped member There is a problem that the required length dimension of the support column 8 changes depending on the presence or absence of the gap between 4 and its size. In order to solve this problem, the support column 8 is always used regardless of the unevenness of the inclined surface 3. A prefabricated staircase having the same length and dimension has been proposed (see FIG. 1 of Patent Document 2).

7 and 8 are views referenced to illustrate another such conventional prefabricated staircase 22. The same parts as those of the conventional prefabricated staircase 2 shown in FIGS. 5 and 6 are designated by the same reference numerals except for a part, and duplicate explanations are omitted except for a part.

As shown in FIG. 7, the conventional prefabricated staircase 22 has two rod-shaped members 4 provided on the inclined surface 3 and a staircase on the rod-shaped member 4, similarly to the conventional prefabricated staircase 2. It was provided with a plurality of step members 6 arranged side by side.

Then, in the conventional prefabricated staircase 22, the lower end portion of the conventional prefabricated staircase 2 is replaced with the support column 8 whose lower end portion is fixed to the inclined surface 3 as shown in FIG. The configuration is different from that of the conventional prefabricated staircase 2 in that the support column 24 is fixed to the side surface of the rod-shaped member 4 via the support column support portion 26.

The columns 24 of the conventional prefabricated stairs 22 are each formed in an elongated cylindrical shape like the columns 8 of the conventional prefabricated stairs 2, and the column support portions 26 provided at the lower ends thereof are shown in FIG. As described above, the plate-shaped connecting portion 26a provided at the lower end portion of the support column 24 and the plate-shaped support portion 26b provided at the end portion of the connection portion 26a opposite to the support column 24 were provided.

As shown in FIG. 8B, the connecting portion 26a of the strut support portion 26 has a predetermined length dimension in the length direction of the strut 24 (upper and lower direction in the figure), and the direction from the strut 24 toward the rod-shaped member 4 ( It is formed in a plate shape having predetermined width dimensions in the left-right direction in the figure), and the end portion of the connecting portion 26a on the strut 24 side (left side in the figure) in the width direction is the outer periphery of the lower end portion of the strut 24 by welding or the like. It was joined to the side of the surface facing the rod-shaped member 4 (on the right side in the figure).

As shown in FIG. 8A, the support portion 26b of the support column support portion 26 is formed in a plate shape having a predetermined length dimension in the length direction of the rod-shaped member 4 (from the upper left to the lower right in the figure). As shown in FIG. 8B, the plate surface is arranged so as to face the side surface of the rod-shaped member 4 facing the support column 24 (left side in the figure), and the plate on the opposite side (left side in the figure). The substantially center of the surface was joined to the end of the connecting portion 26a on the rod-shaped member 4 side (right side in the figure) in the width direction by welding or the like.

Then, the support portion 26b is penetrated in the plate thickness direction at a position near both ends in the length direction so as to be substantially symmetrical to each other across the central portion in the length direction of the support portion 26b, and the opening shape thereof is the support portion. Two mounting holes 26c formed in an arc shape so as to be convex on both end sides in the length direction of 26b were formed respectively.

As shown in FIG. 8B, such a support column 24 contacts the plate surface of the support portion 26a of the support column 26 on the side facing the rod-shaped member 4 (on the right side in the figure) with the side surface of the rod-shaped member 4. The male threaded portion of the bolt B1 is continuously inserted into the mounting hole 26c formed in the support portion 26b and the through hole formed in the rod-shaped member 4, and the nut is inserted into the tip portion of the male threaded portion. N1 was fixed to the side surface of the rod-shaped member 4 by being screwed.

In this way, by fixing the support column 24 to the rod-shaped member 4 via the support column support portion 26 provided at the lower end portion of the support column 24, the support column 24 always has a constant length dimension regardless of the unevenness of the inclined surface 3. It was supposed to be available in.

Further, even when the inclination angle of the inclined surface 3 is slightly large (or small), the position of the mounting hole 26c of the support portion 26b through which the male screw portion of the bolt B1 is inserted is moved in the length direction of the arc shape. By making it possible, the mounting angle of the support column 24 can be changed, so that the support column 24 can be adjusted to be vertical.

As shown in FIG. 7, the handrail member 10 of the conventional prefabricated staircase 22 is also formed in the shape of an elongated square bar, as in the conventional prefabricated staircase 2, so as to connect the upper ends of the adjacent columns 24. It was installed in.

By the way, in any case, the handrail member 10 of the conventional prefabricated stairs 2 and 22 as described above has a horizontal cross-sectional shape provided at the upper end portion of each of the columns 8 and 24 as shown in FIG. Was attached to the columns 8 and 24 via a handrail attachment 30 formed in a substantially U-shaped plate shape (see FIG. 9B).

As shown in FIG. 9B, the handrail attachment 30 has a back plate portion 30a formed in a plate shape having a horizontal cross-sectional shape curved in an arc shape along the outer peripheral surfaces of the columns 8 and 24, and a back plate. Two side plate portions 30b formed in substantially parallel by bending in the same direction from both ends of the portion 30a in the horizontal direction (vertical direction in the figure) are provided, and the back plate portions 30a and the two side plate portions 30b are respectively provided. A through hole was formed in the substantially center of the plate so as to penetrate each plate in the thickness direction.

The back plate portions 30a are provided on both sides of the upper end portions of the columns 8 and 24 in the radial direction (middle left and right direction in FIG. 9B) with the center of the columns 8 and 24 interposed therebetween. The plate surfaces of the columns 8 and 24 are arranged so as to be in contact with each other along the outer peripheral surfaces of the columns 8 and 24. Further, the male threaded portion of the bolt B2 is continuously inserted into the through hole penetrating the columns 8 and 24 in the diameter direction, and the nut N2 is screwed to the tip of the male threaded portion to screw the columns 8 and 24. It was fixed to the upper end of.

Then, the tip portion of the handrail member 10 in the length direction is arranged so as to be sandwiched between the two side plate portions 30b of the handrail attachment 30, and the through hole formed in each side plate portion 30b and the handrail member 10 The male threaded portion of the bolt B3 is continuously inserted into the through hole formed at the tip portion and penetrating the handrail member 10 in the width direction (middle and vertical direction in FIG. 9B), and the male threaded portion of the bolt B3 is continuously inserted into the tip portion of the male threaded portion. The handrail member 10 was connected to the handrail attachment 30 by screwing the nut N3.

Utility Model Registration No. 3119522 Utility Model Registration No. 3184856

However, in the conventional prefabricated stairs 2 and 22 as described above, when the handrail member 10 is attached to the upper ends of the columns 8 and 24, the handrail member 10 is attached by changing the left and right angles with respect to the traveling direction of the stairs. There was a problem that it was difficult.

That is, the conventional prefabricated stairs 2 and 22 as described above are not always installed in a straight line as shown in FIG. 6, and are as shown in FIG. 10 according to the inclination angle and unevenness of the inclined surface 3. In addition, the traveling direction of the stairs may be bent to the left and right, and in that case, the handrail member 10 also needs to be attached by changing the angle to the left and right along the traveling direction of the stairs.

However, in the conventional prefabricated stairs 2 and 22, as shown in FIG. 9B, the handrail attachment 30 for attaching the handrail member 10 to the columns 8 and 24 penetrates the columns 8 and 24 in the radial direction. The bolts B2 are fixed to the columns 8 and 24 at symmetrical positions on both sides of the center of the columns 8 and 24, and the two handrail members 10 are attached to the columns 8 and 24 at different angles as they are. I couldn't.

Therefore, conventionally, as shown on the left side of FIG. 10, two columns 8 and 24 are arranged adjacent to each other at a place where the traveling direction of the stairs changes, and the handrail member 10 is attached to each of the columns 8 and 24. I was trying to install each.

Alternatively, as shown on the right side of FIG. 10 and FIG. 11, through holes for inserting the bolt B2 for fixing the handrail attachment 30 are provided at the upper ends of the single columns 8 and 24 at their respective height positions. By changing the angle of the central axis to form two and attaching the handrail attachment 30 to each through hole, the two handrail members 10 can be attached to one column 8 or 24 at different heights and angles. I was doing it.

However, in the method of providing two columns as described above, the number of columns to be installed increases and the number of processes for installing the columns also increases, which increases the material cost and prolongs the construction period. There was a risk of inviting.

In addition, in the method of forming two through holes by changing the height of one support, the height position of the handrail member changes at the place where the traveling direction of the stairs changes, which only spoils the aesthetic appearance of the stairs. There was a risk that the person climbing the stairs could not grasp the handrail and the posture became unstable.

In reality, the direction of travel of the stairs may be adjusted while checking the condition of the inclined surface at the construction site. Therefore, in the method of forming two through holes in one column, a through hole is formed in the column. The work to be done and the work to post-treat the formed through holes such as plating and painting will be performed at the construction site, which may complicate the construction work and prolong the construction period.

Therefore, in view of the above problems, the present invention makes it possible to easily adjust the left and right angles of the handrail member to prevent an increase in material cost, complicated construction work, and lengthening of the construction period. The object is to provide a prefabricated staircase that can reduce the construction cost.

In order to solve the above problems, the prefabricated staircase according to the present invention
In a prefabricated staircase in which a plurality of step members are arranged in a staircase pattern on a rod-shaped member arranged along the inclination direction on an inclined surface.
The step members are erected at positions outside the length direction from the end portion in the length direction so as to be lined up at predetermined intervals along the traveling direction of the stairs, and the horizontal cross-sectional shape of the outer peripheral surface is circular. With multiple columns formed ,
A handrail attachment provided at the upper end of each of the plurality of columns,
The handrail attachment provided at the upper end of the adjacent columns of the plurality of columns is provided with a handrail member to which both ends in the length direction are connected to each other.
The handrail mounting tool includes a handrail support portion to which an end portion of the handrail member is connected, and a strut fixing portion fixed to the outer peripheral surface of the strut.
The handrail support portion has an arc-shaped back plate portion whose horizontal cross-sectional shape is formed so as to follow the circular shape of the horizontal cross-sectional shape of the outer peripheral surface of the column.
The strut fixing portion is formed in an arcuate plate shape so that its horizontal cross-sectional shape follows a circle of the horizontal cross-sectional shape of the outer peripheral surface of the strut, and one of the length portions in the arc direction along the circle. The end portion is fixed to the arcuate back plate portion of the handrail support portion, and the other end portion of the length portion in the arc direction is moved away from the arcuate back plate portion of the handrail support portion. By projecting in the arc direction, a stretched plate portion extending in an arc shape longer than the arc-shaped back plate portion of the handrail support portion is formed in the column fixing portion.
The rolled plate portion is fixed to the outer peripheral surface of the support column.

Further, the prefabricated staircase according to the present invention is
The handrail support portion is formed so as to include two side plate portions formed so as to bend from both ends of the arcuate back plate portion in the arc direction to the opposite side of the support column fixing portion and extend substantially parallel to each other. ing
It is characterized by that.

Further, the prefabricated staircase according to the present invention is
A through hole is formed in the rolled plate portion to penetrate the rolled plate portion in the thickness direction.
By screwing the nut to the male threaded portion of the bolt that is continuously inserted into the through hole formed in the support column and the through hole formed in the extension plate portion, the handrail mounting tool is attached to the outer peripheral surface of the support column. It is characterized by being fixed.

Further, the prefabricated staircase according to the present invention is
The through hole formed in the rolled plate portion is formed into an elongated hole whose opening shape is elongated in the arc direction of the rolled plate portion.
By moving the position where the male screw portion of the bolt is inserted in the through hole formed in the rolled plate portion in the arc direction of the rolled plate portion, the arc of the column fixing portion of the handrail attachment to the column is formed. It is characterized by being able to change the mounting angle in the direction.

Further, the prefabricated staircase according to the present invention is
The strut is characterized in that its lower end is fixed to the inclined surface.

Further, the prefabricated staircase according to the present invention is
The strut is characterized in that its lower end is fixed to the rod-shaped member.

Further, the prefabricated staircase according to the present invention is
At the lower end of the strut, a strut support portion having a support portion facing the side surface of the rod-shaped member facing the strut is provided.
The lower end of the column is fixed to the rod-shaped member by screwing the nut to the male threaded portion of the bolt that is continuously inserted into the through hole formed in the rod-shaped member and the mounting hole formed in the support portion. It is characterized by being done.

According to such a prefabricated staircase of the present invention,
In a prefabricated staircase in which a plurality of step members are arranged in a staircase pattern on a rod-shaped member arranged along the inclination direction on an inclined surface.
The step members are erected at positions outside the length direction from the end portion in the length direction so as to be lined up at predetermined intervals along the traveling direction of the stairs, and the horizontal cross-sectional shape of the outer peripheral surface is circular. With multiple columns formed ,
A handrail attachment provided at the upper end of each of the plurality of columns,
The handrail attachment provided at the upper end of the adjacent columns of the plurality of columns is provided with a handrail member to which both ends in the length direction are connected to each other.
The handrail mounting tool includes a handrail support portion to which an end portion of the handrail member is connected, and a strut fixing portion fixed to the outer peripheral surface of the strut.
The handrail support portion has an arc-shaped back plate portion whose horizontal cross-sectional shape is formed so as to follow the circular shape of the horizontal cross-sectional shape of the outer peripheral surface of the column.
The strut fixing portion is formed in an arcuate plate shape so that its horizontal cross-sectional shape follows a circle of the horizontal cross-sectional shape of the outer peripheral surface of the strut, and one of the length portions in the arc direction along the circle. The end portion is fixed to the arcuate back plate portion of the handrail support portion, and the other end portion of the length portion in the arc direction is moved away from the arcuate back plate portion of the handrail support portion. By projecting in the arc direction, a stretched plate portion extending in an arc shape longer than the arc-shaped back plate portion of the handrail support portion is formed in the column fixing portion.
By fixing the rolled plate portion to the outer peripheral surface of the support column,
By making it possible to easily adjust the left and right angles of the handrail member, it is possible to prevent an increase in material cost, complicated construction work, and lengthening of the construction period, thereby reducing the construction cost.

It is a figure which shows the handrail attachment 40 of the prefabricated stairs 32 which concerns on one Embodiment of this invention, FIG. It is an enlarged perspective view around the upper end portion of the support column 8 of the prefabricated staircase 32. It is a figure showing the handrail attachment 40 shown in FIG. 1, FIG. 2A is a side view thereof, and FIG. 2B is a plan view thereof. In order to explain the mechanism of changing the angle of the handrail attachment 40 attached to the support column 8, it is a schematic plan view showing the periphery of the upper end portion of the support column 8 in an enlarged manner. In order to explain the mechanism of changing the angle of the handrail attachment 40 attached to the support column 8, it is the schematic plan view which shows only the support column 8 part of the prefabricated staircase 32. It is a side view which shows the conventional prefabricated stairs 2. It is a top view of the prefabricated staircase 2 shown in FIG. It is a side view which shows another conventional prefabricated staircase 22. FIG. 7 is an enlarged view showing the periphery of the lower end portion of the support column 24 of the prefabricated staircase 22 shown in FIG. 7, FIG. 8A is a side view thereof, and FIG. 8B is a front view thereof. 5 and 7 are enlarged views of the upper end portions of the columns 8 and 24 of the conventional prefabricated stairs 2 and 22, FIG. 9A is a side view thereof, and FIG. 9B is a side view thereof. ) Is the plan view. It is a schematic plan view of the conventional prefabricated stairs 2, 22 installed by bending the traveling direction of the stairs. FIG. 10A is an enlarged view showing the periphery of the upper end portions of the columns 8 and 24 on the right side of the conventional prefabricated stairs 2 and 22 shown in FIG. 10, and FIG. 11A is a side view thereof, and FIG. b) is the plan view.

Hereinafter, a mode for carrying out the prefabricated staircase according to the present invention will be specifically described with reference to the drawings.

1 to 4 are views for reference to explain the prefabricated staircase 32 according to the embodiment of the present invention. The same parts as those of the conventional prefabricated staircase 2 shown in FIGS. 5 and 6 are designated by the same reference numerals except for a part, and duplicate explanations are omitted except for a part.

The prefabricated staircase 32 according to the present embodiment is the same as the conventional prefabricated staircase 2 (see FIG. 5), the two rod-shaped members 4 provided on the inclined surface 3 and the rod-shaped members 4 above the two rod-shaped members 4. A plurality of step members 6 arranged in a staircase pattern, a plurality of columns 8 provided on both sides of the step members 6, and a plurality of handrail members 10 provided so as to connect the upper ends of the plurality of columns 8. I have.

The prefabricated staircase 32 according to the present embodiment replaces one or both of the two handrail attachments 30 (see FIG. 9) provided at the upper end of the support column 8 of the conventional prefabricated staircase 2. The configuration is different from that of the conventional prefabricated staircase 2 in that the handrail attachment 40 as shown in FIG. 1A is provided.

As shown in FIG. 2B, the handrail attachment 40 has a handrail support portion 42 having a horizontal cross-sectional shape formed in a substantially U-shaped plate shape and a plate shape having a horizontal cross-sectional shape curved in an arc shape. The column fixing portion 44 formed is provided.

The handrail support portion 42 of the handrail attachment 40 has a back plate portion 42a formed in an arc shape whose horizontal cross-sectional shape is curved in an arc shape along the outer peripheral surface of the support column 8 and a back plate portion 42a in the horizontal direction (FIG. It is provided with two side plate portions 42b formed substantially parallel to each other by bending in the same direction from both ends of 2 (b) middle and vertical directions), and a side plate portion 42b is provided in the thickness direction at substantially the center of the two side plate portions 42b. A through hole 42c is formed through the hole 42c.

The support column fixing portion 44 of the handrail attachment 40 is formed in a plate shape in which the horizontal cross-sectional shape is curved in an arc shape along the outer peripheral surface of the support column 8, and the length in the circumferential direction is similarly the horizontal cross-sectional shape. Is formed so as to be longer than the circumferential length of the back plate portion 42a of the handrail support portion 42 formed in an arc shape.

Then, as shown in FIG. 2B, the outer plate surface of the support column fixing portion 44 in the radial direction is the inner plate surface of the back plate portion 42a of the handrail support portion 42 in the radial direction (opposite to the side plate portion 42b). Along with contacting along the surface, the length portion in the circumferential direction of the support column fixing portion 42 protrudes outward (lower side in the figure) from one end portion in the circumferential direction of the back plate portion 42a of the handrail support portion 42. The contact portion between the handrail support portion 42 and the support column fixing portion 44 is joined by welding or the like.

That is, in the handrail attachment 40, the support column fixing portion 44 is fixed to the back plate portion 42a of the handrail support portion 42, so that the back plate portion 42a of the handrail support portion 42 has two length portions in the circumferential direction. It is formed so as to extend outward from one of the side plate portions 42b of the side plate portion 42b.

Then, as shown in FIG. 2A, the rolled plate portion 44a is provided in the central portion of the rolled plate portion 44a of the support column fixing portion 44 extended outward from the side plate portion 42b of the handrail support portion 42 in this way. An elongated through hole 44b is formed which penetrates in the thickness direction and whose opening shape is elongated in the circumferential direction of the rolled plate portion 44a.

As shown in FIG. 3A, such a handrail attachment 40 is provided on both sides of the upper end of the support column 8 installed at a position where the traveling direction of the prefabricated staircase 32 changes, in the diameter direction of the support column 8. Instead of one handrail attachment 30 of the two handrail attachments 30 (see FIG. 9), the plate surface of the column fixing portion 44 is arranged so as to come into contact with the outer peripheral surface of the column 8.

Then, a through hole formed in the back plate portion 30a of the handrail attachment 30, a through hole 44b formed in the extended plate portion 44a of the support column fixing portion 44 of the handrail attachment 40, and a through hole 44b formed in the upper end portion of the support column 8. Further, the male threaded portion of the bolt B4 is continuously inserted into the through hole penetrating the column 8 in the diameter direction, and the nut N4 is screwed to the tip of the male threaded portion to be screwed to the upper end of the column 8. It is fixed.

By using the prefabricated staircase 32 provided with such a handrail attachment 40, the left and right angles of the handrail member 10 can be easily changed.

That is, as shown in FIG. 3A, the handrail attachment 40 can be attached to the support column 8 with the handrail support portion 42 at an angle to the handrail attachment tool 30, and one support column 8 can be attached. The two handrail members 10 can be attached by changing the left and right angles.

Further, since the through hole 44b of the extending plate portion 44a of the support column fixing portion 44 of the handrail mounting tool 40 is formed in a long hole shape, the male screw portion of the bolt B4 is inserted as shown in FIG. 3 (b). By moving the position of the through hole 44b in the circumferential direction of the extending plate portion 44a, the mounting angle of the handrail attachment 40 with respect to the support column 8 in the circumferential direction can be changed, and the position is adjusted to the traveling direction of the prefabricated staircase 32. Therefore, the angle of the handrail member 10 can be adjusted.

Further, since the handrail attachment 40 can be used upside down from the state shown in FIG. 2A, as shown in FIG. 4, when the traveling direction of the prefabricated staircase 32 is bent to the left or right. However, one type of handrail mounting tool 40 can be used.

Then, by using the prefabricated staircase 32 provided with such a handrail attachment 40, two columns 8 can be installed at a place where the traveling direction of the prefabricated staircase 32 changes, or two columns can be penetrated into one column. Since it is not necessary to form holes, it is possible to prevent an increase in material cost, complicated construction work, and a long construction period, and to reduce the construction cost accordingly.

As described above, according to the prefabricated staircase 32 provided with the handrail attachment 40 according to the present embodiment, the left and right angles of the handrail member can be easily adjusted, which increases the material cost and complicates the construction work. It is possible to prevent the construction cost from becoming longer and to reduce the construction cost.

The present invention is not limited to the present embodiment, and various modifications can be made as long as the object of the present invention can be achieved.

For example, in the prefabricated staircase 32 according to the present embodiment, the handrail attachment 40 is attached to the upper end portion of the support column 8 in which the lower end portion of the conventional prefabricated staircase 2 shown in FIGS. 5 and 6 is fixed to the inclined surface 3. Is attached, but is not limited to such a configuration, and the support column 24 in which the lower end portion of another conventional prefabricated staircase 22 shown in FIGS. 7 and 8 is fixed to the side surface of the rod-shaped member 4. The handrail attachment 40 may be attached to the upper end portion of the.

Further, in the prefabricated staircase 32 according to the present embodiment, the tip portion of the handrail member 10 is arranged between the two side plate portions 42a of the handrail support portion 42 of the handrail attachment 40, and is provided by bolts B3 and nuts N3. Although it was connected, such a method may not be used as long as the tip end portion of the handrail member 10 can be attached to the handrail support portion 42 of the handrail attachment 40.

Further, in the prefabricated staircase 32 according to the present embodiment, the extending plate portion 44a of the support column fixing portion 44 of the handrail attachment 40 has a long hole-shaped through hole 44a elongated in the circumferential direction of the extending plate portion 44a. Although one was formed, the shape is not limited to such a shape. For example, in order to more firmly fix the handrail attachment 40, two or more through holes 44a are provided with a width of the extending plate portion 44a. They may be formed side by side in a direction (upper and lower directions in FIG. 2A).

Further, in the prefabricated staircase 32 according to the present embodiment, the support column 8 is formed in a hollow cylindrical shape, but it is not necessary to be limited to such a shape. For example, the support column 8 is a solid circle. It may be formed in a rod shape.

Further, in the prefabricated staircase 32 according to the present embodiment, the handrail member 10 is formed in the shape of a solid square bar, but it is not necessary to be limited to such a shape. For example, the handrail member 10 is hollow. It may be formed in the shape of a square cylinder, or may be formed in the shape of a cylinder or a round bar having a circular cross-sectional shape.

Further, in the prefabricated staircase 32 according to the present embodiment, the support column 8 and the handrail member 10 are provided on both sides of the step member 6, but the step member is not limited to such a configuration. It may be provided only on one side of 6.

2 Prefabricated stairs 3 Inclined surface 4 Rod-shaped member 5 Anchor bolt 6 Step member 6a Step plate 6b Lifting plate 6c Mounting plate part 8 Pillar 10 Handrail member 12, 14 Nail member 16 Pile 18 Steel pipe 20 Mortal 22 Prefabricated stairs 24 Strut support Part 26a Connection part 26b Support part 26c Mounting hole 30 Handrail mounting tool 30a Back plate part 30b Side plate part 32 Prefabricated stairs 40 Handrail mounting tool 42 Handrail support part 42a Back plate part 42b Side plate part 42c Through hole 44 Strut fixing part 44a Rolled plate Part 44b Through hole B1, B2, B3, B4 Bolt N, N1, N2, N3, N4 Nut

Claims (7)

In a prefabricated staircase in which a plurality of step members are arranged in a staircase pattern on a rod-shaped member arranged along the inclination direction on an inclined surface.
The step members are erected at positions outside the length direction from the end portion in the length direction so as to be lined up at predetermined intervals along the traveling direction of the stairs, and the horizontal cross-sectional shape of the outer peripheral surface is circular. With multiple columns formed ,
A handrail attachment provided at the upper end of each of the plurality of columns,
The handrail attachment provided at the upper end of the adjacent columns of the plurality of columns is provided with a handrail member to which both ends in the length direction are connected to each other.
The handrail mounting tool includes a handrail support portion to which an end portion of the handrail member is connected, and a strut fixing portion fixed to the outer peripheral surface of the strut.
The handrail support portion has an arc-shaped back plate portion whose horizontal cross-sectional shape is formed so as to follow the circular shape of the horizontal cross-sectional shape of the outer peripheral surface of the column.
The strut fixing portion is formed in an arcuate plate shape so that its horizontal cross-sectional shape follows a circle of the horizontal cross-sectional shape of the outer peripheral surface of the strut, and one of the length portions in the arc direction along the circle. The end portion is fixed to the arcuate back plate portion of the handrail support portion, and the other end portion of the length portion in the arc direction is moved away from the arcuate back plate portion of the handrail support portion. By projecting in the arc direction, a stretched plate portion extending in an arc shape longer than the arc-shaped back plate portion of the handrail support portion is formed in the column fixing portion.
A prefabricated staircase characterized in that the rolled plate portion is fixed to the outer peripheral surface of the support column. The handrail support portion is formed so as to include two side plate portions formed so as to bend from both ends of the arc-shaped back plate portion in the arc direction to the opposite side of the support column fixing portion and extend substantially parallel to each other. The prefabricated staircase according to claim 1, wherein the staircase is characterized by being . A through hole is formed in the rolled plate portion to penetrate the rolled plate portion in the thickness direction.
By screwing the nut to the male threaded portion of the bolt that is continuously inserted into the through hole formed in the support column and the through hole formed in the extension plate portion, the handrail mounting tool is attached to the outer peripheral surface of the support column. The prefabricated staircase according to claim 1 or 2, characterized in that it is fixed. The through hole formed in the rolled plate portion is formed into an elongated hole whose opening shape is elongated in the arc direction of the rolled plate portion.
By moving the position where the male screw portion of the bolt is inserted in the through hole formed in the rolled plate portion in the arc direction of the rolled plate portion, the arc of the column fixing portion of the handrail attachment to the column is formed. The prefabricated staircase according to claim 3, wherein the mounting angle in the direction can be changed. The prefabricated staircase according to any one of claims 1 to 4, wherein the lower end portion of the support column is fixed to the inclined surface. The prefabricated staircase according to any one of claims 1 to 4, wherein the lower end of the support column is fixed to the rod-shaped member. At the lower end of the strut, a strut support portion having a support portion facing the side surface of the rod-shaped member facing the strut is provided.
The lower end of the column is fixed to the rod-shaped member by screwing the nut to the male screw portion of the bolt that is continuously inserted into the through hole formed in the rod-shaped member and the mounting hole formed in the support portion. The prefabricated staircase according to claim 6, wherein the staircase is to be used.

Images