JP7058158B2 - How to install outdoor stairs structure and outdoor stairs structure - Google Patents

Description

The present invention relates to an outdoor staircase structure and a method for installing the outdoor staircase structure.

Conventionally, as an outdoor staircase installed on the outside of a building, for example, a staircase as shown in Patent Document 1 is known. In the stairs described in Patent Document 1, a pair of support columns are erected on the outside of the building body, and support beams are projected on both side surfaces of the support columns, and the landing and stairs are used by using these support beams. It is a structure that supports the part.

Japanese Patent No. 2769303

However, in the conventional outdoor stairs, the connection portion between the support pillar and the support beam is a pillar win. That is, the structure is such that the support beam is projected from the side surface of the support column, and as the number of floors increases, welding or column jointing with high-strength bolts is required. Further, in order to connect the support beam to the side surface of the support column, a beam or a bracket that is rigidly joined in advance to the side surface of the support column is required, and in that case, a protrusion is formed on the side surface of the support column. There is a problem that the transportation efficiency is deteriorated as compared with the case of transporting a normal pillar having no protruding portion.

Therefore, an object of the present invention is to provide an outdoor staircase structure that does not require welding of support columns or column joints with high-strength bolts and can prevent deterioration of transportation efficiency of constituent members, and an installation method of the outdoor staircase structure. It is something to do.

The present invention has been made to solve the above problems, and the outdoor staircase structure of the present invention is an outdoor staircase structure installed outside a building.
The lower stairs and
The upper stairs, which are connected to the lower stairs so as to fold back,
A support beam that supports the upper part of the lower staircase and the lower part of the upper staircase,
It is characterized in that it is provided with a support column which is connected to the lower surface side of the support beam in a beam-winning state and supports the support beam.

In the outdoor staircase structure of the present invention, it is preferable to further provide a support column which is connected to the upper surface side of the support beam in a beam-winning state and supports the support beam on the upper floor.

Further, in the outdoor staircase structure of the present invention, a landing component is provided at the upper part of the lower staircase and the lower part of the upper staircase, respectively, and the support beam has the landing component from below. It is preferable to support it.

Further, in the outdoor staircase structure of the present invention, at least one end of the support column in the axial direction is
A connecting portion for connecting the support column to the support beam by bolting is provided.
The connection portion has a plate portion extending perpendicular to the axial direction of the support column.
It is preferable that the plate portion is formed with a hole for bolt penetration located inside the outer surface contour line of the support column when viewed from the axial direction of the support column.

Further, the method of installing the outdoor staircase structure of the present invention is a method of installing the outdoor staircase structure installed on the outside of the building.
The process of erection of the support column above the foundation beam or the support beam on the lower floor,
The process of connecting the support beam above the support column in a beam-winning state,
The process of arranging the upper part of the lower staircase above the support beam and
A step of arranging a lower portion of the upper staircase portion connected to the lower staircase portion so as to fold back above the support beam and arranging an upper portion of the upper staircase portion above the other support beam. It is characterized by that.

According to the present invention, it is possible to provide an outdoor staircase structure that does not require welding of support columns or column joints with high-strength bolts and can prevent deterioration of transportation efficiency of constituent members, and an installation method of the outdoor staircase structure.

It is a perspective view which shows the outdoor stairs structure as one Embodiment of this invention. It is a perspective view which shows the outdoor staircase structure as another embodiment of this invention. FIG. 3 is an enlarged perspective view showing a connection portion between a support beam and a support column in the outdoor staircase structure of FIG. 1. FIG. 3 is a cross-sectional view seen from the axial direction of the support column at the connection portion of FIG. 3A. It is a perspective view which shows the modification of the connection part of a support beam and a support column in an enlarged manner. 4 is a cross-sectional view seen from the axial direction of the support column at the connection portion of FIG. 4A. It is a perspective view which shows the modification of the connection part of a support beam and a support column in an enlarged manner. It is a perspective view which shows the modification of the connection part of a support beam and a support column in an enlarged manner.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

The outdoor staircase structure 1 shown in FIG. 1 is a folded staircase installed on the outside of a building. The building is not particularly limited, but may be, for example, an apartment house or a middle-high-rise building. The apartment house is, for example, a 6-story industrialized house having a steel frame.

It consists of a reinforced concrete foundation structure fixed to the ground (not shown) and a superstructure that has a frame frame composed of frame members such as columns and beams and is fixed to the foundation structure. Has been done. The frame members that make up the frame frame are standardized, and are manufactured in advance at the factory and then carried to the construction site for assembly.

Note that FIG. 1 shows only a part of the skeleton of an apartment house as a building. Specifically, FIG. 1 shows a beam 2 that supports the floor of each floor of the building and a stud 3 that is connected between the upper and lower beams 2 and extends in the vertical direction. The beam 2 is connected to a column (not shown) constituting the frame frame. In the example shown in FIG. 1, the beam 2 is composed of H-shaped steel and the stud 3 is composed of a square steel pipe, but the beam 2 is not limited to these, and various columnar members such as shaped steel or wood can be used.

The outdoor staircase structure 1 includes, for example, a flat main landing 4 connected to an outer corridor on each floor of an apartment building, and a flat intermediate landing 5 located at an intermediate height of the floors. Between the main landing 4 and the intermediate landing 5, a stepped elevating part 6 connecting the main landing 4 and the intermediate landing 5 is provided. Further, the main landing area 4, the intermediate landing area 5, and the elevating part 6 are composed of a lower staircase part 7 and an upper staircase part 8 which is connected to the lower staircase part 7 so as to be folded back. An outer wall panel or the like is installed between the beam 2 and the upper staircase portion 8. The staircase extending toward the lower floor when viewed from the intermediate landing 5 side is referred to as the lower staircase portion 7, and the staircase extending toward the upper floor when viewed from the intermediate landing 5 side is referred to as the upper staircase portion 8. In the outdoor staircase structure 1, one side surface (the side surface on the upper staircase portion 8 side) faces the building, and the other side surface (the side surface on the lower staircase portion 7 side) is located on the side away from the building. ing. The arrangement direction of the outdoor staircase structure 1 with respect to the building is not limited to the illustrated example, and the side surface opposite to the example of FIG. 1 may be arranged so as to be the building side, or the main landing 4 side or the intermediate landing. It may be arranged so that the 5 side is the building side.

The lower staircase portion 7 and the upper staircase portion 8 are supported by the staircase support portion. The staircase support portion of this example is connected to the support beam 9 (first support beam 9a, second support beam 9b) located below the lower staircase portion 7 and the upper staircase portion 8 and the support beam 9 in a beam-winning state. A support column 10 (first support column 10a, second support column 10b) is provided. The staircase support portion may include other members such as a reinforcing member connected between the first support beam 9a and the second support beam 9b.

The lower staircase portion 7 has a flat first landing constituent portion 7a provided at the upper portion thereof and a flat second landing constituent portion 7b provided at the lower portion thereof. Further, the elevating part 6 between the first landing part 7a and the second landing part 7b is provided with a tread portion 7c and a riser portion 7d. Further, the lower staircase portion 7 includes left and right girder portions 7e extending substantially in parallel, and left and right handrail portions 7f that also serve as a fall prevention fence. The lower staircase portion 7 can be a staircase unit member unitized by assembling the constituent members in advance at a factory or the like.

The upper staircase portion 8 has a landing configuration portion 8a provided at the upper portion and a landing configuration portion 8b provided at the lower portion. The landing components 8a and 8b are flat portions as a whole, but unevenness such as a step may be formed in a part thereof. Further, between the landing section 8a and the landing section 8b, a tread portion 8c and a riser portion 8d constituting the elevating section 6 are provided. Further, the upper staircase portion 8 includes left and right girder portions 8e extending substantially in parallel, and left and right handrail portions 8f that also serve as a fall prevention fence. The lower staircase portion 8 can be made into a unitized staircase unit member by assembling the members constituting each portion in advance. The lower staircase portion 7 and the upper staircase portion 8 may have the same shape as a common member or may have different shapes. Further, the configurations of the lower staircase portion 7 and the upper staircase portion 8 are not limited to the illustrated examples. For example, the girder portions 7e and 8e are not limited to the side girders as shown in the figure, and may be a sasara girder, or may have a structure that does not have the riser portions 7d and 8d.

The first landing component 7a of the lower staircase 7 constitutes one half of the intermediate landing 5, and the second landing component 8b of the upper staircase 8 constitutes the other half of the intermediate landing 5. do. Similarly, one half of the main landing 4 is composed of the second landing component 7b of the lower staircase 7, and the other half is composed of the first landing component 8a of the upper staircase 8. Will be done.

The upper part of the lower staircase portion 7 (in this example, the first landing part 7a) and the lower part of the upper staircase part 8 (in this example, the second landing part 8b) located on the intermediate landing 5 side are the first support beams 9a. The first support beam 9a is supported by the first support column 10a. On the other hand, the lower part of the lower staircase 7 located on the main landing 4 side (the second landing part 7b in this example) and the upper part of the upper staircase 8 (the first landing part 8a in this example) are the second supporters. It is supported by the beam 9b, and the second support beam 9b is supported by the second support column 10b. In this example, the first landing component 7a and the second landing component 8b are arranged above the first support beam 9a and fixed by bolts, and similarly, the second landing component 7b and the first landing component 8a Is placed above the second support beam 9b and fixed by bolts, but the method of fixing the stairs (lower stairs 7 and upper stairs 8) to the support beam 9 is not limited to this.

The first support beam 9a and the second support beam 9b are parallel to each other and are arranged at different heights. Further, the first support pillar 10a on the intermediate landing 5 side and the second support pillar 10b on the main landing 4 side are arranged in the gap between the lower staircase portion 7 and the upper staircase portion 8.

In the first support beam 9a and the second support beam 9b of this example, a connection plate portion 11 for connecting a staircase portion is provided on the upper surface of one flange of the H-shaped steel, and at a position corresponding to the connection plate portion 11. The reinforcing plate portion 12 is welded between a pair of facing flanges. From the viewpoint of sharing the members, it is preferable that the first support beam 9a and the second support beam 9b are the same member, but members having different shapes may be used.

The first support column 10a is connected to the lower side of the first support beam 9a in a beam-winning state, and supports the first support beam 9a. Here, "connected in a beam-winning state" means that at the connection portion between the support beam 9 and the support column 10, the support column is on the upper surface side or the lower surface side of the support beam 9 so that the support beam 9 maintains continuity. It means that 10 is connected. The support beam 9 and the support pillar 10 may be directly connected to each other, or may be connected to each other via other members such as connecting hardware. Except for the support beam 9 on the top floor, the support pillar 10 that supports the support beam 9 on the upper floor is connected to the upper surface side of the support beam 9 in a beam-winning state.

The first support column 10a and the second support column 10b have a stigma 13 provided at one end in the axial direction and a column base 14 provided at the other end. Since the first support column 10a and the second support column 10b of this example have the same shape of the stigma 13 and the column base 14, they can be used even if they are turned upside down. Further, from the viewpoint of sharing the members, the first support column 10a and the second support column 10b are preferably the same member, but may be members having different shapes.

The stigma 13 and the pedestal 14 are connecting portions for connecting the support columns 10 to the support beams 9 by bolt joining. Specifically, the stigma 13 and the pedestal 14 have a shaft portion 15 having a substantially cross-shaped cross section and a plate portion 16 extending perpendicular to the axial direction of the support column 10. The plate portion 16 is formed with a hole 17 for bolt penetration located inside the outer contour line of the support column 10 when viewed from the axial direction of the support column 10 (see FIG. 3B). In this way, since the hole 17 for penetrating the bolt is located inside the contour line of the outer surface of the support column 10 when viewed from the axial direction of the support column 10, the bolt does not protrude to the outside of the support column 10, so that the other It does not easily interfere with the members and can be excellent in appearance.

FIG. 3A is an enlarged perspective view showing a connection portion between the support beam 9 and the column base portion 14 (or the stigma 13) of the support column 10. FIG. 3B is a cross-sectional view of the support column 10 as viewed from the axial direction when the shaft portion 15 is cut perpendicular to the axial direction. As shown in FIG. 3A, the plate portion 16 is brought into contact with the upper surface (or lower surface) of the support beam 9 in a state where the support pillar 10 is vertically abutted against the upper surface of the support beam 9, and the plate portion 16 is formed. The support beam 9 and the support column 10 can be connected by fastening a bolt to a bolt hole with a female thread formed on the upper surface (or lower surface) of the support beam 9 through the hole 17. Alternatively, the holes 17 of the plate portion 16 and the through holes formed in the support beam 9 may be fastened with bolts and nuts.

The method of connecting the support beam 9 and the support column 10 is not limited to this, and the methods shown in FIGS. 4A and 4B and FIGS. 5 and 6 may be used as long as the axial force and the shear force of the column can be sufficiently transmitted. .. 4A and 4B are perspective views and cross-sectional views showing an example of a connecting portion when the support column 10 is made of H-shaped steel. A hole 17 for bolt penetration is formed in the plate portion 16 welded to the tip of the support column 10, and the plate portion 16 has an upper surface (or lower surface) of the support beam 9 as in the case shown in FIGS. 3A and 3B. ) Is bolted. As shown in FIG. 4B, the four holes 17 are located inside the outer contour line (maximum width position and maximum depth position of the H-shaped steel) of the support column 10 when viewed from the axial direction of the support column 10. ing.

5 and 6 are perspective views showing an example in which the holes 17 for bolts are located outside the outer contour line of the support pillar 10 at the connection portion between the support beam 9 and the support pillar 10. As shown in FIG. 5, the support beam 9 and the support column 10 may be connected by using a connecting metal fitting 18 having an L-shaped cross section. The support column 10 shown in FIG. 5 is a square steel pipe, and the connection hardware 18 is arranged so as to be in contact with both side surfaces of the support column 10, and the support column 10 and the connection hardware 18 are sandwiched and fastened from both sides with bolts and nuts. I am doing it. Further, each connecting metal fitting 18 is bolted to the upper surface (or lower surface) of the support beam 9.

In the example shown in FIG. 6, a hole 17 for a bolt is formed in a plate portion 16 welded to the tip of a support column 10, and the plate portion 16 is brought into contact with the upper surface (or lower surface) of the support beam 9 to be bolted. It is joined. In either case, the support beam 9 and the support column 10 can be connected in a beam-winning state.

It is preferable that the first support beam 9a supporting the intermediate landing 5 side and the second support beam 9b supporting the main landing 4 side are connected to the frame of the building. The first support beam 9a of this example is connected to a stud 3 provided between the vertically adjacent beams 2. The connection between the stud 3 and the first support beam 9a is not particularly limited, but for example, the end of the first support beam 9a is attached to a plate-shaped connecting metal fitting 3a (bracket) previously welded or bolted to the stud 3. This can be done by bolting the parts together. Further, the second support beam 9b on the main landing 4 side is connected to the beam 2. The connection between the beam 2 and the second support beam 9b is not particularly limited, but for example, by bolting the second support beam 9b to a plate-shaped connecting metal fitting (not shown) welded to the beam 2. It can be carried out. With such a configuration, the horizontal force generated by the outdoor staircase structure 1 can be received by the building frame, so that the stability of the outdoor staircase structure 1 can be improved and the rolling motion at the time of an earthquake or the like can be reduced. Can be done.

The installation method of the outdoor staircase structure 1 will be described below. First, the column base portion 14 of the first support column 10a is fixed to the foundation beam (not shown), and the first support column 10a is erected vertically. Next, the first support beam 9a is stacked on the upper surface of the first support column 10a, and the stigma 13 and the lower surface of the first support beam 9a are fixed by bolting to the first support column 10a and the first support. The beam 9a is connected in a beam-winning state. Further, the end portion of the first support beam 9a is connected to the stud 3 by bolt joining. Next, the first landing component 7a of the lower staircase portion 7 is arranged above the first support beam 9a, and the connection plate portion 11 of the first support beam 9a and the first landing component 7a are fixed by bolt joining. do. As a result, a truss state is formed by the first support column 10a, the first support beam 9a, and the lower staircase portion 7, and the frame is stabilized. Even if the first support column 10a and the first support beam 9a are not rigidly joined, the frame is stabilized depending on the truss state.

Next, the second support column 10b and the second support beam 9b are installed in the same manner as the first support column 10a and the first support beam 9a at predetermined intervals from the first support column 10a and the first support beam 9a. do. Further, the second support beam 9b is connected to the beam 2 by bolt joining. Then, the second landing component 8b of the upper staircase 8 is arranged above the first support beam 9a, and the first landing component 8a of the upper staircase 8 is arranged above the second support beam 9b. Then, the upper staircase portion 8 is fixed to the connection plate portion 11 of the first support beam 9a and the second support beam 9b by bolt joining. As a result, a truss state is formed by the second support column 10b, the second support beam 9b, and the upper staircase portion 8, and the frame is stabilized. The lower staircase portion 7 and the upper staircase portion 8 are fixed to the support beam 9 (first support beam 9a and second support beam 9b) by forming a through hole formed in the connection plate portion 11 of the support beam 9 as described above. It can be done by the bolt joining used, but it is not limited to this.

Next, the first support pillar 10a on the upper floor is connected to the upper surface side of the existing first support beam 9a on the lower floor in a beam-winning state, and the first support beam 9a on the upper floor is connected above the first support pillar 10a. To fix. Then, the lower staircase portion 7 on the upper floor is arranged and fixed above the existing second support beam 9b and the first support beam 9a on the upper floor. As a result, a truss state is formed by the first support column 10a on the upper floor, the first support beam 9a on the upper floor, and the lower staircase portion 7 on the upper floor, and the frame is stabilized. By repeating this, the outdoor staircase structure 1 can be installed for each floor from the lower side. That is, equipment such as large-scale scaffolding becomes unnecessary, as in the case of using long support columns extending over multiple floors, and it can also be used as a temporary staircase that can be used in the process of building a building. .. From the viewpoint of reducing the load generated on the first support beam 9a, the first support pillar 10a on the lower floor and the first support pillar 10a on the upper floor are arranged so that their axes are located on the same straight line. Is preferable, but the present invention is not limited to this. Similarly, it is preferable that the second support pillar 10b on the lower floor and the second support pillar 10b on the upper floor are arranged so that the axes coincide with each other, but the present invention is not limited to this.

Further, according to the present embodiment, since the first support beam 9a is located between the first support pillar 10a on the lower floor and the first support pillar 10a on the upper floor, the upper and lower first support pillars are located. The work of directly connecting the 10a to each other becomes unnecessary. Therefore, it is not necessary to weld the support columns 10 or join columns with high-strength bolts, which facilitates on-site construction work. Further, since it is not necessary to configure a carry-out beam, a bracket, or the like for connecting the support beam 9 to the side surface of the support pillar 10, it is possible to suppress deterioration of the transportation efficiency of the support pillar 10.

FIG. 2 shows an outdoor staircase structure 20 as another embodiment of the present invention. The skeleton of the building in which the outdoor staircase structure 20 is installed includes a pillar 21 and a beam 22 connected between the pair of pillars 21.

The outdoor staircase structure 20 has the same configuration as the previous embodiment shown in FIG. 1, and includes a left-right inverted lower staircase portion 7 and an upper staircase portion 8.

Further, the outdoor staircase structure 20 includes a first support beam 9c on the intermediate landing 5 side located on the side away from the building, a pair of left and right first support pillars 10c, and a carry-out beam 23 fixed to the pillar 21 of the building. It is provided with a second support beam 9d on the side of the main landing 4 connected to the main landing. Further, the outdoor staircase structure 20 is provided with reinforcing members 24 for connecting both ends of the first support beam 9c and the take-out beam 23. The carry-out beam 23 of this example is fixed to the pillar 21 of the building, but the present invention is not limited to this, and the carry-out beam 23 may be fixed to the beam 22 of the building.

In the previous embodiment shown in FIG. 1, both the main landing 4 side and the intermediate landing 5 side are supported by the support beam 9 and the support pillar 10, but in the present embodiment, the lower staircase portion 7 and the upper staircase portion 7 are supported. The main landing 4 side of the part 8 is supported by the skeleton on the building side (the carry-out beam 23 fixed to the beam 22). This makes it possible to improve the stability of the main landing 4 side.

Further, in the outdoor staircase structure 20, in the above embodiment shown in FIG. 1, the first support pillar 10a and the second support pillar 10b are arranged in the gap between the lower staircase portion 7 and the upper staircase portion 8. However, in this example, a pair of first support columns 10c are arranged outside the lower staircase portion 7 and the upper staircase portion 8, respectively. In this way, by providing a pair of support columns so as to sandwich the lower staircase portion 7 and the upper staircase portion 8 from the outside, stability can be improved. In addition, only one or a plurality of support columns 10 for supporting the first support beam 9c may be provided in the gap between the lower staircase portion 7 and the upper staircase portion 8.

In the outdoor staircase structure 20, since the pair of first support columns 10c are connected to the first support beam 9c in a beam-winning state, the first support columns 10c move up and down as in the previous embodiment. There is no need to connect directly to. Therefore, welding or column jointing with high-strength bolts becomes unnecessary, and on-site construction work becomes easy. Further, since it is not necessary to configure a carry-out beam, a bracket, or the like for connecting the first support beam 9c to the side surface of the first support pillar 10c, deterioration of the transportation efficiency of the first support pillar 10c can be suppressed. Further, also in the outdoor staircase structure 20 of this example, since each member can be installed for each layer, the construction is easy and the staircase can be used as a temporary staircase. Further, when the buildings are constructed in order from the lower layer, the stairs can be installed according to the progress of the construction of the building, so that it is not necessary to project only the columns of the stairs and take safety measures for that purpose.

Further, as described above, in the outdoor staircase structure 20, the main landing 4 side faces the building and the intermediate landing 5 side protrudes from the building, so that the intermediate landing 5 side is difficult to stabilize. Stability is improved by providing the support column 10c. Further, by providing the reinforcing member 24 for the carry-out beam 23 on the building frame side and the first support beam 9c, the stability on the intermediate landing 5 side can be more effectively enhanced.

The building according to the present invention is not limited to the configuration of the above-described embodiment, and can be realized by various configurations without departing from the contents described in the claims. For example, the shapes of the support beam 9 and the support column 10 are not limited to the above examples, and various columnar members such as shaped steel or wood can be used. Further, in the outdoor staircase structure 1 shown in FIG. 1, a vertical load applied to one support beam 9 (first support beam 9a or second support beam 9b) is applied to one support column 10 (first support column 10a or first support column 10a or second support column 9b). Although it is configured to be received by the two support columns 10b), a plurality of support columns 10 may be connected to each support beam 9 so that the plurality of support columns 10 receive a vertical load.

Further, in the outdoor staircase structure 20, the vertical load on the main landing 4 side is supported on the skeleton side of the building, but the support pillar 10 constituting the staircase support portion receives the vertical load on the main landing 4 side. It may be configured. That is, for example, a pair of support columns 10 may be connected to the second support beam 9d as in the intermediate landing 5 side, and the pair of support columns 10 may be configured to receive a vertical load on the main landing 4 side.

1: Outdoor stairs structure 2: Beams 3: Studs 4: Main landing 5: Intermediate landing 6: Elevating part 7: Lower stairs part 7a: 1st landing part (landing part)
7b: Second landing area (landing area)
7c: Tread part 7d: Rising part 7e: Girder part 7f: Handrail part 8: Upper stairs part 8a: First landing part (landing part)
8b: 2nd landing area (landing area)
8c: Tread part 8d: Rising part 8e: Girder part 8f: Handrail part 9 (9a, 9b, 9c, 9d): Support beam 10 (10a, 10b, 10c): Support pillar 11: Connection plate part 12: Reinforcing plate Part 13: Pillar head (connection part)
14: Column base (connection)
15: Shaft part 16: Plate part 17: Bolt penetration hole 18: Connection hardware 20: Outdoor staircase structure 21: Pillar 22: Beam 23: Take-out beam 24: Reinforcing member

Claims (5)

It is an outdoor staircase structure installed on the outside of the building.
The lower stairs and
The upper stairs, which are connected to the lower stairs so as to fold back,
A support beam that supports the upper part of the lower staircase and the lower part of the upper staircase,
An outdoor staircase structure comprising a support column that is connected to the lower surface side of the support beam in a beam-winning state and supports the support beam. The outdoor staircase structure according to claim 1, further comprising a support pillar that is connected to the upper surface side of the support beam in a beam-winning state and supports the support beam on the upper floor. The outdoor staircase according to claim 1 or 2, wherein a landing component is provided in the upper part of the lower staircase and the lower part of the upper staircase, respectively, and the support beam supports the landing component from below. Construction. At least one end of the support column in the axial direction
A connecting portion for connecting the support column to the support beam by bolting is provided.
The connection portion has a plate portion extending perpendicular to the axial direction of the support column.
According to any one of claims 1 to 3, the plate portion is formed with a hole for bolt penetration located inside the outer contour line of the support column when viewed from the axial direction of the support column. Described outdoor staircase structure. It is a method of installing an outdoor staircase structure that is installed outside the building.
The process of erection of the support column above the foundation beam or the support beam on the lower floor,
The process of connecting the support beam above the support column in a beam-winning state,
The process of arranging the upper part of the lower staircase above the support beam and
A step of arranging a lower portion of the upper staircase portion connected to the lower staircase portion so as to fold back above the support beam and arranging an upper portion of the upper staircase portion above the other support beam. How to install an outdoor staircase structure.

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