JP2021008744A - Steel staircase and attachment method of steel staircase - Google Patents

Abstract

To provide a steel staircase of a dry connection type simplifying attachment work on a receiving beam.SOLUTION: A specific landing width plate 10S is arranged above a receiving beam 61 for a steel staircase configured to fix step boards 30 arranged in a step-like shape and a landing width plate 10 on a string 1 of a steel plate. The specific landing width plate 10S is placed in a horizontal state (a first status) (a) by loosely fastening a bolt in a side of a fixing screwed hole 21, with no bolt arrangement in a side of a fixing screwed hole 20, to install the steel staircase on the receiving beam 61. The specific landing width plate 10S is placed in a second state (b) with an angle by rotating the specific landing width plate 10S around an axis of the fixing screw hole 21 to form an operation opening 54 allowing visual inspection of the receiving beam 61 from an upper surface side. The string 1 and the receiving beam 61 are fixed to each other by working through the operational opening 54. Returning the specific landing width plate 10S to the first state and closing the operation opening 54 to fasten the bolt using the fixing screwed holes 21, 20 make the string 1 and the specific landing width plate 10S fixed.SELECTED DRAWING: Figure 4

Description

The present invention relates to a steel staircase in which a step plate is attached to a steel plate sasara girder (side girder), and a method for attaching a steel staircase in which the steel staircase is fixed to a receiving beam (steel frame) of a structure.

Conventionally, in a steel-framed staircase in which step plates are arranged in a staircase pattern, it has been common to place concrete on site on the underlying iron plate in the construction of the landing portion. In this construction, in order to determine the position of the upper surface of the concrete, it is necessary to level the sasara girder, and the stairs may be soiled by the concrete, so there are inadequate points such as the stairs cannot be used until the concrete hardens. It was. Therefore, many dry steel stairs with an integrated landing have been proposed (Patent Document 1).

When fixing such a dry staircase to the receiving beam (usually made of steel) of the skeleton (building structure), the steel sasara girder and the receiving beam are directly welded or the hardware fixed to the sasara girder is used. It was fixed to the receiving beam by welding or bolting.

JP-A-11-117480

When fixing the steel stairs to the receiving beam, if the width plate is not laid on the landing of the dry stairs and the opening is left, welding work and bolt tightening work can be done from the upper side of the steel stairs (upper side of the receiving beam). However, after receiving the steel stairs and fixing them to the beams, it is necessary to attach the width plate to the steel stairs at the site, which increases the work at the site and has a problem that the stairs cannot be used until laying.

In addition, in order to reduce on-site work, if a width plate is laid in advance on the landing of the dry stairs, it can be used immediately after fixing the steel frame stairs, but welding work is done from the lower surface side of the dry stairs (lower surface side of the receiving beam). In this case, there is a case where an opening is provided in the width plate and welding or tightening work is performed from the opening (the prior art of Patent Document 1). In this case, it is necessary to close the opening later, and there is a problem that an opening mark remains.

In addition, if a width plate is laid in advance on the landing of the dry stairs and no opening is provided, it is necessary to weld or bolt the outside of the steel frame stairs (width plate), and when adjusting the level. It was also necessary to install a level adjusting device on the outside of the steel-framed staircase (width plate) (Patent Document 1).

In the present invention, since the width plate of the landing is rotatably formed, it is easy to form an opening in the landing and close it after the fact.

That is, the invention of this steel-framed staircase is a steel-framed staircase that is used by fixing the upper and lower parts to a receiving beam of a structure, and is characterized by being configured as follows.
(1) A walking board group having a step board arranged in a staircase pattern and a landing width board forming a landing portion if necessary is formed, and the walking board group is fixed to a steel plate sasara girder. , Constructed a steel staircase.
(2) At least one of the walking board groups, the walking board located above the receiving beam is used as a specific walking board, and the specific walking board is rotated around a rotation axis arranged in the width direction of the stairs. It was attached to the sasara girder so as to be free.
(3) The specific walking board is located substantially horizontally at the first position so that the upper surface thereof can walk, and is positioned at an angle with respect to the horizontal at the second position, and at the second position. , An operation opening was formed so that the receiving beam could be visually recognized from above the steel frame stairs.

Further, another invention of the steel frame staircase is a steel frame staircase used by fixing the upper and lower sides to a receiving beam of a structure, and is characterized by being configured as follows.
(1) A group of walking boards having a step board portion composed of step boards arranged in a staircase pattern and a landing width plate forming a landing section above and below the step board portion was formed.
(2) A steel staircase was constructed by sandwiching and fixing the walking board group with two steel plate sasara girders.
(3) The landing section is formed by attaching a plurality of landing width plates in the direction of travel of the stairs, and at least one of the landing width plates, the landing located above the receiving beam is designated as a specific landing width plate. The steel frame stairs were also attached so as to be rotatable around a rotation axis in which the specific landing width plate was arranged in the width direction of the stairs.
(4) The specific landing width plate is located substantially horizontally at the first position so that the upper surface thereof can be walked, is located at an angle with respect to the horizontal at the second position, and is located at the second position. Therefore, an operation opening was formed so that the receiving beam could be visually recognized from above the steel frame stairs.

Further, each of the steel frame stairs is characterized by being configured as follows.
(1) In the stairs traveling direction of the landing width plate, the front edge is the first fitting edge, the back edge is the second fitting edge, and the adjacent landing width plates are both fitted at the first position. The shape is such that the joint edges can be fitted to each other.

Further, the invention of the mounting method is to erection and fix a steel staircase formed by fixing a running plate group consisting of a step plate arranged in a staircase shape and a necessary landing width plate to a steel plate sasara girder on a receiving beam of a structure. It is a method of mounting a steel frame floor, which is characterized by being configured as follows.
(1) At least one traveling plate in the traveling plate group is used as a specific traveling plate, and the specific traveling plate is located at a position corresponding to the receiving beam and is rotatable around a rotation axis arranged in the width direction of the stairs. It is attached to the sasara girder.
(2) Follow the steps below to install the steel stairs.
(a) The bone staircase is erected on the receiving beam.
(b) Subsequently, the specific traveling plate is rotated to bring the specific traveling plate into a second state at an angle with respect to the horizontal direction, and the upper surface side of the specific traveling plate is set on both sides of the specific traveling plate in the traveling direction. An operation opening is formed so that the receiving beam can be visually recognized.
(c) Work is performed from the upper surface side of the steel frame staircase through the operation opening to fix the sasara girder and the receiving beam.
(d) The specific traveling plate is rotated to be the first position in the horizontal state, the operation opening is closed, and then the specific traveling plate is fixed to the sasara girder.

In the present invention, a width plate corresponding to the position of a receiving beam of a building on which a steel staircase is erected is used as a specific width plate, a special width plate that can rotate in the width direction, and is rotated with the first position of a pedestrian horizontal arrangement. The configuration is such that the second position of the diagonal arrangement can be selected. Therefore, it is possible to form an operation opening in which the receiving beam can be visually observed from the steel stairs side as the second position simply by rotating the special width plate, and various tools and jigs can be inserted into the operation opening to perform downward work from the steel stairs side. it can. Therefore, the operator has the effect of being able to safely and efficiently install and fix the steel frame stairs with a small operation.

A plan view of a state in which a steel frame staircase of the present invention is installed is shown. A partial front view of a state in which a steel frame staircase of the present invention is installed is shown. In the landing width plate of the steel frame stairs of the present invention, (a) is a plan view of the first embodiment, (b) is also a right side view (front view), and (c) is a plan view of the second embodiment. (D) also represents a right side view (front view). It is a figure of the landing part of the steel frame stairs of the 1st Embodiment of this invention, and shows the front view in the state which one Sasara girder is removed, (a) is the 1st position, (b) is the 2nd position, respectively. Shown. It is a figure of the landing part of the steel frame stairs of the 2nd Embodiment of this invention, and shows the front view in the state which one Sasara girder is removed, (a) is the 1st position, (b) is the 2nd position, respectively. Shown. It is a figure of the landing part of the steel frame stairs of the 3rd Embodiment of this invention, and shows the front view in the state which one Sasara girder is removed, (a) shows the 1st position, (b) shows the 2nd position, respectively. .. In the figure of the landing part of the steel frame stairs of the 4th embodiment of this invention, the front view with one of the sasara girders removed is shown, (a) shows the 1st position, (b) shows the 2nd position, respectively. ..

Embodiments of the present invention will be described with reference to the drawings.
1. 1. Composition of steel stairs 50

(1) Building 60 and steel stairs 50

A steel staircase 50 is erected and fixed between a receiving beam 61 on the lower floor of the building 60 and a receiving beam 61 on the upper floor, and the receiving beams 61 and 61 are supported by columns 63 of the building 60 (FIG. 1, Fig. 2). Further, the steel frame staircase 50 is configured by sandwiching a predetermined number of step plates 30 and 30 and landing width plates 10 and 10 between the sasara girders 1 and 1 made of steel plates.
In the sasara girder 1, substantially horizontal landing portions 5 and 5 are formed at both ends of the diagonally arranged substrate portion 4. The step plate 30 sandwiched and fixed between the sasara girders 1 and 1 has a substantially L-shape composed of a tread plate 31 and a riser plate 32, and the landing width plate 10 is formed in a flat plate shape, both of which match the stair width D. It is formed with a width D. The step plates 30 and 30 and the landing width plates 10 and 10 are combined to form a running plate.

(2) Landing width plate 10

At the edge of the landing width plate 10 in the width D direction, an upper locking ridge 15 having a thickness of about half of t is formed on the surface 11 (upper surface) side at the front edge in the traveling direction when walking on stairs. ing. Further, when walking on stairs, a lower locking ridge 17 having a thickness of about half of t is formed on the back surface 12 (lower surface) side at the rear edge in the traveling direction. The upper locking ridge 15 (lower locking ridge 17) is formed so as to be flush with the main body on the front surface 11 (back surface 12) of the landing width plate 10.
On the back surface 12 side of the upper locking ridge 15 of the landing width plate 10, a lower locking notch 16 that can be locked with the lower locking ridge 17 of another landing width plate 10 is formed. Similarly, on the surface 11 side of the lower locking ridge 17 of the landing width plate 10, an upper locking notch 18 that can be fitted with the upper locking ridge 15 of another landing width plate 10 is formed (FIG. 3 (a) (b)).
The landing width plate 10 has fixed surfaces 13 and 13 whose both end surfaces in the width D direction are in contact with the inner surfaces 3 of the sasara girders 1 and 1, and two fixing screw holes 20 and 21 are formed on the fixed surfaces 13 and 13. There is.
The fixing screw holes 20 and 21 are formed by exposing the other surface of the long nut 22 buried together with the anchor steel rod 22a on one side (FIG. 3A). The fixing screw holes 20 and 20 of the fixing surfaces 13 and 13 are formed on the same straight line 27. Further, the fixing screw holes 21 and 21 of the fixing surfaces 13 and 13 are also formed on the same straight line 28, and the straight lines 27 and 28 are formed so as to be substantially orthogonal to the fixing surfaces 13 and 13.
Further, on the surface 11 (upper surface) of the landing width plate 10, the upper surface of the nut embedded toward the surface 11 is exposed at the substantially center in the width D direction and at the intermediate position (approximately center) of the straight lines 27 and 28. The locking screw hole 23 is formed (FIGS. 3A and 3B).
Since the landing width plate 10 having the above structure is integrally formed of the cement-based material, the cement-based material is exposed on the outer surface of the landing width plate 40. The above landing width plate 10 and the specific landing width plate 10S are the first embodiment.
Further, among the landing width plates 10, in the specific landing width plate 10S, straight lines 28 (fixing screw holes 21, 21; long nuts 22, 22, anchor steel rods 22a, 22a) form a rotation axis.

(3) Step plate 30

Similarly, in the substantially L-shaped step plate 30 composed of the tread plate 31 and the riser plate 32, fixed surfaces 34, 34 that come into contact with the inner surfaces 3 of the sasara girders 1, 1 are formed on both end surfaces in the width D direction. Two fixing screw holes 36, 37 are formed on the tread plate 31 side on the fixing surfaces 34, 34.
The fixing screw holes 36 and 37 are formed by exposing the other surface of the long nut 22 buried together with the anchor steel rod 22a on one side, similarly to the fixing screw holes 20 and 21 of the landing width plate 10 (similar to the fixing screw holes 20 and 21). Not shown. See FIG. 3 (a)). Similarly, the fixing screw holes 36, 36 of the fixing surface 34 are on the same straight line, the fixing screw holes 37, 37 of the fixing surface 34 are also formed on the same straight line, and both straight lines are the fixed surfaces 34, 34. It is formed so as to be substantially orthogonal (not shown, see FIG. 3A).
Since the step plate 30 having the above structure is integrally formed of the cement-based material, the cement-based material is exposed on the outer surface of the step plate 30.

(4) End width plate 40

Further, the end width plate 40 arranged near the boundary between the landing width plates 10 and 10 and the step plates 30 and 30 similarly abuts on both end surfaces in the width D direction with the inner surfaces 3 of the sasara girders 1 and 1. The fixing surfaces 44 and 44 are formed, and two fixing screw holes 46 and 47 are formed on the fixing surfaces 44 and 44. Since the end width plate 40 having the above structure is integrally formed of the cement-based material, the cement-based material is exposed on the outer surface of the end width plate 40.
Although the end width plate 40 is positioned as the end of the landing portion, it may belong to any of the landing width plates 10, 10 or the step plates 30 and 30 due to the structure of the present patent.

(5) Sasara girder 1

The positions of the fixing screw holes 20, 21, the fixing screw holes 36, 37, and the fixing screw holes 46, 47 of the step plates 30, 30, the landing width plates 10, 10 and the end width plates 40 are provided on the sasara girders 1 and 1. The mounting holes 6 and 6 are formed in accordance with the above (FIGS. 3A and 3B). Further, the diagonally formed portions corresponding to the step plates 30 and 30 form the base portion 4, and the substantially horizontally formed portions corresponding to the landing width plates 10 and 10 constitute the landing portion 5 (FIG. 1). , Fig. 2).
Further, a piece of an L-shaped fixing bracket 9 used for fixing to the upper surface of the receiving beam 61 of the structure 60 is fixed to the ends of the landing portions 5 and 5 on the inner surface 3 of the sasara girders 1 and 1. ing. The other piece of the fixing bracket 9 is brought into contact with the receiving beam 61 and fixed by bolting or welding. Therefore, the fixing bracket 9 is fixed in advance so that the position of the fixing bracket 9 is the fixed position with the receiving beam 61. Further, a holding metal fitting 7 for maintaining the horizontal state (first position) of the specific landing width plate 10S is attached to the inner surface 3 of the sasara girder 1 (FIGS. 2, 4, etc.).

(6) Assembly of steel stairs

(A) A predetermined number (here, 8) of step plates 30 and 30 arranged in a staircase pattern between the inner surfaces 3 and 3 of the two side-by-side sasara girders 1 and 1 and the step plates 30 and 30 in the traveling direction. The end width plates 40 and a predetermined number (4 here) of landing width plates 10 and 10 are arranged on the front side, and a predetermined number (4 here) of landing widths are arranged on the rear side in the traveling direction of the step plates 30 and 30. The plates 10 and 10 are arranged side by side, and the fixed surfaces 13a, 13b, 34a, 34b, 44a and 44b are brought into contact with the inner surfaces 3 and 3 of the sasara girders 1 and 1.
Bolts inserted from the mounting holes 6 and 6 of the sasara girders 1 and 1 are inserted into the step plates 30 and 30, the landing width plates 10 and 10, and the fixing screw holes 20 and 21 and the fixing screw holes 36 and 37 of the intermediate width plate 40. It is screwed into the fixing screw holes 46 and 47 to fix the sasara girders 1 and 1 and the step plates 30 and 30, the landing width plates 10 and 10, and the intermediate width plate 40.

(B) In the step of fixing the sasara girders 1 and 1 and the landing width plates 10 and 10 of (a), the sasara girders 1 and 1 are located near the fixed position of the receiving beam 61 of the building 60 (that is, the fixing bracket). The landing width plate 10 located in the vicinity of 9) is designated as the specific landing width plate 10S. In the specific landing width plate 10S, when fixing to the sasara girders 1 and 1, the fixing screw holes 20 and 20 located directly above the fixing position (that is, directly above the fixing bracket 9) and the mounting holes 6 of the sasara girders 1 and 1 , 6 are not fixed (do not insert bolts into the mounting holes 6 and fixing screw holes 21).
Further, in the other fixing screw holes 21 and 21 of the specific landing width plate 10S, the bolts inserted into the mounting holes 6 and 6 of the sasara girder 1 are loosened. Specifically, since the straight line 28 connecting the bolt, the mounting hole 6, and the fixing screw holes 21, 21 serves as the rotation axis, the tightening is such that the bolt is easy to rotate and the bolt is not likely to fall off.
The upper locking ridge 15 of the specific landing width plate 10S is not fixed to the sasara girder 1 on the fixing screw holes 21 and 21 side of the specific landing width plate 10S, but the upper locking ridge 15 of the specific landing width plate 10S is a locking projection 8 formed on the sasara girders 1 and 1. Since it is locked to (at the height position of the lower locking notch 16) and the lower locking ridge 17 of the specific landing width plate 10S is locked to the upper locking ridge 15 of the adjacent landing width plate 10. , It is possible to prevent the specific landing width plate 10S from accidentally moving during normal transportation (from the factory to the construction site, the mounting position). It is also possible to insert a pin that can be easily pulled out from the mounting holes 6 and 6 into the fixing screw holes 20 and 20 (not shown).

(C) As described above, the steel frame staircase 50 is constructed. In the steel stairs 50, the portion where the sasara girder 1 is diagonally formed and the step plates 30 and 30 are arranged is used as the elevating part 51, and the portion where the landing width plates 10 and 10 are arranged is the landing portion in the substantially horizontal portion of the sasara girder 1. It is referred to as a part 52 (FIGS. 1 and 2).

2. 2. Attachment of the steel frame stairs 30 to the receiving beam 61

(1) A steel frame staircase 50 is erected between the lower floor side receiving beam 61 and the upper receiving beam 61 of the building 60, and the upper and lower tips of the steel staircase sasara girders 1 and 1 are erected on the receiving beam 61. (Fig. 1, Fig. 2, Fig. 4 (a)). In this state, the specific landing width plate 10S is located immediately above the receiving beams 61, 61, and the specific landing width plate 10S is in the horizontal state (first position) (FIG. 4A). In this state, the lower locking ridge 17 of the specific landing width plate 10S is locked to the upper locking ridge 15 of the adjacent landing width plate 10, and the upper locking ridge 15 side of the specific landing width plate 10S. The back surface 12 of the above is in contact with the holding metal fitting 7 of the sasara girder 1, and the rotation to the side opposite to the rotation to the second position side is restricted (FIGS. 4A and 4B).
In this state, the steel frame stairs 50 are held by various jigs so as not to be displaced (not shown).

(2) Subsequently, when the specific landing width plate 10S is rotated around the straight line 28 to make the specific landing width plate 10S diagonal from the horizontal position (a state having an angle with respect to the horizontal. Second position), the operation opening 54 Is formed, and the fixing metal fitting 9 (receiving beam 61) becomes visible (FIG. 4 (b)). In this state, various tools are inserted through the operation opening 54, and the other piece of the fixing bracket 9 and the receiving beam 61 are fixed with bolts. It can also be fixed by welding. At this time, since the worker is located on the surface 11 of the landing width plates 10 and 10 of the steel frame stairs 50 and can work downward, the work can be performed safely and efficiently.

(3) When the fixing work of the other piece of the fixing bracket 9 and the receiving beam 61 is completed, the specific landing width plate 10S is rotated in the opposite direction and returned to the horizontal position (FIG. 4A. First position). ), Tighten the bolts of the fixing screw holes 21 and 21 that were loosely tightened, and then insert the bolts from the mounting holes 6 of the sasara girder 1 into the fixing screw holes 20 of the specified landing width plate 10S and tighten them to identify the sasara girder 1. The landing 10S is fixed (Fig. 4 (a)).

(4) When the fixing of all the fixing metal fittings 9 and 9 and the receiving beam 61 is completed in the steel frame stairs 50, and the fixing of the specified landing width plate 10 returned to the horizontal and the sasara girder 1 is completed. Installation of the steel frame stairs 50 is completed (FIGS. 1 and 2).

3. 3. Other embodiments

(1) In the above embodiment, the landing width plate 10 has a structure in which the cement-based material is exposed on the outer surface (FIG. 3 (a)), but has the same structure as the outer surface is covered with a metal plate such as a steel plate. It can also be (FIGS. 3 (c) (d)). In this case, the fixed surfaces 13 and 13 have a structure in which the front surface 11 to the upper locking ridge 15 and the lower locking notch 16 to the back surface 12 to the lower locking ridge 17 and the upper locking notch are covered with a metal plate. There is no metal plate, and the fixing screw holes 20 and 21 are exposed (FIGS. 3 (c) and 3 (d)). Further, in this structure, a metal plate is usually used as a formwork, and a cement material is filled in the molded metal plate to manufacture a landing width plate 10. The above is the second embodiment.
Since the landing width plate 10 having this structure has the same outer structure as the landing tread plate 10 (FIGS. 3A and 3B) in which the cement-based material is exposed on the outer surface, the upper locking ridge 15 and the lower clerk A stop strut 17, a lower locking notch 16, an upper locking notch 18, and the like are also formed (FIGS. 3 (c) and 3 (d)). Further, the same step plates 30, 30 and sasara girders 1 and 1 can be used to form a steel staircase 50 having the same structure, and the structure and operation of the specific landing tread plate 10S are also the same (FIG. 5 (FIG. 5). a) (b)). Therefore, the procedure for attaching and fixing the building 60 to the receiving beam 61 is the same (FIGS. 5 (a) and 5 (b), 1 and 2).
Similarly, the step plate 30 and the end width plate 40 may have a structure in which the outer surface is covered with a metal plate (not shown).

(2) Further, in the above-described embodiment, the fixing bracket 9 is fixed to the end of the sasara girder 1, but the landing portion 52 of the steel frame stairs 50 (the landing portion 5 of the sasara girder 1) is aligned with the position of the receiving beam 61. Then, when the fixing bracket 9 is attached to the intermediate position in the stairs traveling (climbing) direction 56 or the side near the elevating portion 51 (base portion 4 of the sasara girder 1), the landing corresponding to the position of the fixing bracket 9 The width plate 10 becomes the specific landing width plate 10S (not shown).

(3) Further, in the above-described embodiment, one specific landing width plate 10S is formed for one fixing metal fitting 9 (receiving beam 61), but two or more specified landing width plates 10S can be formed (not shown). ).
Further, when a plurality of receiving beams are located on the lower surface of one landing portion 5 of the sasara girder 1, a plurality of fixing brackets 9 are fixed to one landing portion 5 of the sasara girder 1 correspondingly. , A plurality of specific landing width plates 10S are also used.

(4) Further, in the above-described embodiment, a steel frame staircase 50 (Sasara girder 1 is only the base portion 4) of only the elevating portion 51 that does not form the landing portion 52 can be used (not shown). In this case, since the fixing bracket 9 is fixed to the base portion 4 of the sasara girder 1, one of the step plates 30 corresponding to the position of the fixing bracket 9 is the specific step plate 30S. In this case, in the specific step plate 30S, similarly to the specific landing width plate 10S, the rotation shaft is formed by loosely tightening bolts in one of the fixing screw holes 20 and 21, for example, one of the fixing screw holes 20 and 20. Then, the bolts are not inserted on the other fixing screw holes 21 and 21 (see FIGS. 3A and 3B).

(5) Further, in the above-described embodiment, in addition to the specific landing width plate 10S, three landing tread plates 10 and 10 are provided, but the length of the landing width plate 10 in the traveling direction 56 depends on the length of the landing portion 52. The length (length perpendicular to the width D) and the number of installations are arbitrary (not shown).
Further, the landing width plates 10 and 10 can be configured from the landing width plate 10A and the special landing width plate 10S having a long length in the traveling direction 56 of the landing width plate 10 (FIGS. 6A and 6B). ). In this case, the configurations of the end width plates 40 and the step plates 30 and 30 are the same as those in the above embodiment (FIGS. 6A and 6B). The above is the third embodiment.
Similarly, in the embodiment using the landing width plate 10A, the specific landing width plate 10S is in a normal walking state at the horizontal position (first position) (FIG. 6A), and is rotated to have a horizontal angle. In the state (second position), the operation opening 54 can be formed. Therefore, the work from the upper side of the steel frame staircase 50 enables the fixing work of the receiving beam 61 and the fixing metal fitting 9 of the sasara girder 1 (FIG. 6B).

(6) Further, in the third embodiment of (5), similarly to the second embodiment, the landing width plate 10A and the specific landing width plate 10S can also be configured such that the surface is covered with a steel plate. (FIGS. 7 (a) and 7 (b)).

1 Sasara girder 2 Outer surface of Sasara girder 3 Inner surface of Sasara girder 4 Base part of Sasara girder 5 Landing part of Sasara girder 6 Mounting hole of Sasara girder 7 Holding metal fitting 8 Locking protrusion of Sasara girder 9 Fixing metal fittings 10 and 10A of Sasara girder Landing width plate 10S Specified landing width plate 11 Front side of landing width plate 12 Back side of landing width plate 13 Fixed surface of landing width plate 15 Top of landing width plate Locking ridge 16 Bottom notch of landing width plate 17 Bottom of landing width plate Locking ridge 18 Top notch of landing width plate 20, 21 Fixing screw hole of landing width plate 23 Locking screw hole of landing width plate 28 Rotating axis straight of landing width plate 30 Step plate 31 Step plate 32 Step plate 32 Rise plate 34 Fixed surface of step plate 36, 37 Fixed screw hole of step plate 40 End width plate 42 Top locking beam of end width plate 43 Lower notch of end width plate 44 Fixing surface of end width plate 46 Fixing screw hole of end width plate 47 Fixing screw hole of end width plate 50 Steel stairs 51 Elevating part of steel stairs 52 Landing part of steel stairs 54 Operation opening of steel stairs 56 Progressing (climbing) direction of stairs 60 Buildings 61 Building beams 62 Building pillars

Claims (4)

A steel staircase that is used by fixing the top and bottom to the receiving beam of a structure, and is characterized by being configured as follows.
(1) A walking board group having a step board arranged in a staircase pattern and a landing width board forming a landing portion if necessary is formed, and the walking board group is fixed to a steel plate sasara girder. , Constructed a steel staircase.
(2) At least one of the walking board groups, the walking board located above the receiving beam is used as a specific walking board, and the specific walking board is rotated around a rotation axis arranged in the width direction of the stairs. It was attached to the sasara girder so as to be free.
(3) The specific walking board is located substantially horizontally at the first position so that the upper surface thereof can walk, and is positioned at an angle with respect to the horizontal at the second position, and at the second position. , An operation opening was formed so that the receiving beam could be visually recognized from above the steel frame stairs. A steel staircase that is used by fixing the top and bottom to the receiving beam of a structure, and is characterized by being configured as follows.
(1) A group of walking boards having a step board portion composed of step boards arranged in a staircase pattern and a landing width plate forming a landing section above and below the step board portion was formed.
(2) A steel staircase was constructed by sandwiching and fixing the walking board group with two steel plate sasara girders.
(3) The landing section is formed by attaching a plurality of landing width plates in the direction of travel of the stairs, and at least one of the landing width plates, the landing located above the receiving beam is designated as a specific landing width plate. The steel frame stairs were also attached so as to be rotatable around a rotation axis in which the specific landing width plate was arranged in the width direction of the stairs.
(4) The specific landing width plate is located substantially horizontally at the first position so that the upper surface thereof can be walked, is located at an angle with respect to the horizontal at the second position, and is located at the second position. Therefore, an operation opening was formed so that the receiving beam could be visually recognized from above the steel frame stairs. The steel frame staircase according to claim 1 or 2, characterized in that it is configured as follows.
(1) In the stairs traveling direction of the landing width plate, the front edge is the first fitting edge, the back edge is the second fitting edge, and the adjacent landing width plates are both fitted at the first position. The shape is such that the joint edges can be fitted to each other. This is a method of erection and fixing a steel-framed staircase consisting of a step plate arranged in a staircase pattern and a necessary landing width plate to a steel plate sasara girder on a receiving beam of a structure as follows. A method of mounting a steel frame floor, which is characterized by being configured in.
(1) At least one traveling plate in the traveling plate group is used as a specific traveling plate, and the specific traveling plate is located at a position corresponding to the receiving beam and is rotatable around a rotation axis arranged in the width direction of the stairs. It is attached to the sasara girder.
(2) Follow the steps below to install the steel stairs.
(a) The bone staircase is erected on the receiving beam.
(b) Subsequently, the specific traveling plate is rotated to bring the specific traveling plate into a second state at an angle with respect to the horizontal direction, and the upper surface side of the specific traveling plate is set on both sides of the specific traveling plate in the traveling direction. An operation opening is formed so that the receiving beam can be visually recognized.
(c) Work is performed from the upper surface side of the steel frame staircase through the operation opening to fix the sasara girder and the receiving beam.
(d) The specific traveling plate is rotated to be the first position in the horizontal state, the operation opening is closed, and then the specific traveling plate is fixed to the sasara girder.

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