JP5506330B2 - Assembly steel stairs - Google Patents

Description

  The present invention relates to an assembling steel staircase that can be assembled with a simple structure with less processing of both the tread and the spar and can be assembled without using welding, and can be walked stably.

  Several structures have been proposed in which step plates made of steel plates are attached in a staircase pattern to the girders. For example, in Patent Document 1, side plate portions 23B and 23B directed downward are provided at both end portions of the receiving plate portion 23A to form a receiving device (step plate) 23 on which a pedestrian puts his / her foot. A structure is described in which the side plate portion 23B of the support 23 is applied to the outside of the girder frame (sagger girder) 20 and fixed with rivets (FIG. 4). In this case, the receiving tools 23, 23 positioned above and below are not fixed.

  In Patent Document 2, the connecting member 1 is formed by fixing the connecting member to which the upper and lower flanges are attached, and the connecting members 1 and 1 are welded to both sides of the step board 16 to form a step unit (step board) 20. It was. In this case, the step units 20 and 20 are shifted up and down in a staircase fashion, and the upper and lower connecting members 1 and 1 are bolted to the upper and lower flanges to constitute a staircase (FIGS. 1 to FIG. 1). 6). Since this step unit and sagittal girder are not required, only a part of the step units can be removed, making the stairs ideal for repair and renovation.

  Further, in Patent Document 3, the step plate attachment members 3 and 3 having through holes for attachment are welded to the side girders (sagger girders) 1, and the step plate members 2 and 2 are attached to the step plate attachment members 3 and 3. It was fixed. Further, the upper and lower corrugated plate members 2 and 2 are fixed with bolts by overlapping the through holes of the upper connecting portion 2c and the lower connecting portion 2d (FIGS. 1 and 2). Alternatively, the step plate attaching member 3 is omitted, and a flange 21a having a through hole is formed at the upper edge of the side beam 1, and the respective step plate members 2 and 2 are similarly attached (FIG. 4, FIG. 5).

JP 2001-140432 A JP 2004-270187 A JP 2005-213896 A

  In the prior art, in Patent Document 1, since the upper and lower steps are not fixed, in order to walk stably, it is necessary to increase the material thickness or to form a rib or the like that is used in combination with welding. There was a problem that the structure of the step was complicated. Further, in Patent Document 2, there is no need for further girders, and although there is a set effect, there is a problem that the structure of the connecting member becomes complicated. Moreover, in patent document 3, since the through-hole toward the upper side was required for the side beam, there existed a problem that the process of a side beam was needed. Further, in each of Patent Documents 1 and 3, the fixing of the girders and the step plates and the fixing of the step plates are separate operations, which complicates the structure of each member. Further, in Patent Document 2, the connecting member also serves as an additional girder, resulting in a complicated structure.

  In such a situation, the present invention is such that the upper connecting portion and the lower connecting portion are overlapped at the step positioned up and down and fixed with the first piece of the connecting hardware having a right angle end, and the second of the connecting hardware. Since the piece was fixed to the saddle girder, the above-mentioned problem was solved by using a common connecting hardware.

That is, the present invention is formed by sandwiching both ends of a step group in which metal steps are arranged in a staircase shape, and fixing the step group and the spar girders with a common connecting hardware. The assembled steel staircase is configured as follows.
(1) The step is at least one step, and the upper connecting portion is continuously connected to the upper edge of the tread plate portion with the upper connecting portion facing upward, and the lower connecting portion is directed downward to the lower edge of the tread plate portion. To connect.
(2) The step group is configured by overlapping a lower connection portion of a step located in an upper step and an upper connection portion of a step located in a lower step, and the lower connection portion and the lower step side of the upper step side. A connecting through hole communicating with the upper connecting portion is formed.
(3) The connecting hardware is formed of a second piece fixed to the sheathing girder and a first piece fixed to the step. The base end of the first piece and the base end of the second piece are connected at a substantially right angle, and the connected base end is defined as a right end.
(4) The second piece of the connecting hardware and the counter girder are joined with a fixed bar, and the through hole of the first piece of the connecting hardware is connected to the connecting through hole and joined with the fixed bar.

Further, in the above, the distance from the left and right end edges of the step up connection hole as L _0, is an assembly steel staircase, characterized in that the distance from the right-angled end of the coupling hardware to hole was L _0.
Furthermore, it is an assembled steel staircase characterized by being configured as follows .
(1) The step group consists of the upper connection part of the step located in the lower stage, only on the lower side of the lower connection part of the step located in the upper stage,
On side of the lower connecting portion (2) the step, located on the lower part form a moiety connecting portion does not overlap on the rung, the portion which is not heavy, bored the second connection hole.

  The fixed bar in the above is a general term for a joining material having a joining shaft, and is a concept including bolts, pins and the like.

  Further, the “upper side of the tread plate” and the “lower side of the tread plate” in the above indicate the tread when the step is one step, and “the uppermost tread when the step is a plurality of groups”. "Upper side of the part" and "Lower side of the bottom tread part".

  At the step located above and below, the upper connecting part and the lower connecting part are overlapped and fixed with the first piece of the connecting hardware having a right-angled end, and the second piece of the connecting hardware is fixed to the sheathing girder. Eliminates the need for work, and makes it possible to make assembling work more efficient by using common connecting hardware. In addition, since the steps for fixing each step and fixing each step and the spar girder can be selected arbitrarily, "Assembly the step first and then fix it with the sag girder" Any assembly method can be selected according to the situation at the site.

  In this way, each step can be pre-plated without welding, and if it is a step for one or two steps, the plating tank can be immersed in a small capacity and once. The production of each member can be made efficient. Also, if welding is not used, no scoring work is required and distortion due to welding heat can be prevented.

FIG. 1 is a longitudinal sectional view of an embodiment of a steel staircase according to the present invention. 2A and 2B are steps used for carrying out the present invention. FIG. 2A is a side view, FIG. 2B is a front view, and FIG. 2C is a plan view. FIGS. 3A and 3B are connection metal fittings used in the practice of the present invention, in which FIG. 3A is a front view, FIG. 3B is a left side view, and FIG. FIG. 4 is a partially enlarged side view of the stair portion of the steel staircase of the present invention. FIG. 5 is a partially enlarged front view of the stair portion of the steel staircase of the present invention. FIG. 6 is a partially enlarged side view of the upper and lower landing part of the steel frame staircase of the present invention. FIG. 7 is a landing part of a steel staircase according to the present invention, where (a) is a partially enlarged front view, (b) is a partially enlarged plan view, and (c) is an enlarged view of a connecting portion. FIG. 8 is an end portion of the landing part of the steel staircase of the present invention, (a) is a partially enlarged plan view, and (b) is a side view.

(1) The steel staircase 51 is constructed by stacking one step 10 and 10 in a stepwise manner and connecting them with the connecting hardware 1 and fixing them to the spar 47 and 47 with the connecting hardware 1 ( FIG. 1).

(2) The connecting hardware 1 is formed in an L shape by connecting a first piece 1A having a through hole 3 and a second piece 1B having a through hole 3 at a right angle end 2 at a right angle. The distance from the right end 2 to each through hole 3 is L ₀ .

(3) The step 10 is configured by connecting an upper connecting portion 15 and a lower connecting portion 21 to upper and lower ends of the horizontal tread plate 11, respectively. The step 10 is arranged up and down in a staircase shape, and connects the upper end portion of the upper connecting portion 15 and the lower end portion of the lower connecting portion to constitute the staircase portion 51 of the steel staircase 50. A kick-in portion 52 is constituted by the stacked upper and lower connecting portions 15 and 21.
In the width direction of the upper connection portion 15, connection through holes 19, 19 are formed in the vicinity of the edges 17, 17, and connection through holes 25, 25 are formed in the vicinity of the width direction edge of the lower connection portion 21. . The connecting through hole 19 is formed inward by a length L ₀ from the end edges 17, 17 in the width direction, and the connecting through holes 25, 25 are formed inward by a length L ₀ from the end edges 23, 23 in the width direction.
The step 10 is constituted by one step in a substantially Z-shape with the “lower connecting plate 21, the step plate 11, and the upper connecting plate 15” being integrated. The step 10 is suitable for one step in terms of strength, material thickness, design, assembly efficiency, etc., but if other conditions are appropriate, “the lower connecting plate 21, the step plate 11, the kicking portion 52 (the upper and lower connecting portions 15, 21), the tread plate 11 and the upper connecting plate 15 "can be composed of two or three or more consecutive stages (not shown).

(4) Steps 10 and 10 are arranged stepwise up and down, and the first piece 1A of the connecting hardware 1 is overlapped with the connecting through holes 25 and 19 communicated with the lower connecting portion 21 and the upper connecting portion 15 that are in contact with each other. Further, the through-hole 3 is made to communicate, and the connecting through-holes 25, 19 and the pin 55 are punched into the through-hole 3, and the lower connecting portion 21, the upper connecting portion hole 15, and the first piece 1 A are fixed integrally. At this time, since the second piece 1B of the connecting hardware 1 is directed to the counter beam 47 side, and the through hole 3 of the second piece and the through hole 48 of the counter beam 47 communicate with each other, the bolt 56 is similarly inserted and the nut is inserted. 57 is fixed by screwing (FIGS. 4 and 5).

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

  [1] Connected hardware 1

The connecting hardware 1 is configured integrally by connecting the base end sides of the first piece 1A and the second piece 1B, each having a semicircular rectangular tip, at right angles. A connecting end portion (outside) of both base ends is a right angle end 2. The first piece 1A is provided with a through hole 3 at a distance L ₀ from the right end 2 and the second piece 1B is similarly provided with a through hole 3 at a position L ₀ from the right end 2. The through hole 3 is positioned at or near the center of the semicircle on the tip side formed in the semicircle.

  [2] Step (normal) 10

  The step 10 has an upper connecting portion 15 connected to an upper edge 12 (direction direction) of the tread 11 arranged horizontally or substantially horizontally, and a lower connecting portion 21 connected to an edge 12a of the lower step (walking direction). And is formed in a substantially Z-shape (FIG. 2A). The upper connecting portion 15 is inclined so that the tip 16 (upper end side) faces the upper surface 13 side (lower step side) of the tread plate 11, and the lower connecting portion 21 has the tip 22 (lower end side) on the lower surface 13a side (upper step side) of the tread plate 11. ) And incline so that it faces. Moreover, the lower connection part 15 and the upper connection part 21 are formed in parallel or substantially in parallel.

When the step 10 is stacked up and down (stepwise), the lower connecting portion 21 of the upper step 10 and the upper connecting portion 15 of the lower step 10 are overlapped to form a kick-up portion 52. The height L ₂ is formed shorter slightly than the height L ₃ of the riser portion 52 of the lower connecting portion 21, "one-third" height L ₁ is riser portion height L ₃ of the upper connecting portion 15 to " It is formed so as to be tightened by about “half” (see FIG. 4).

At the upper edge portion of the upper connecting portion 15, connecting through holes 19, 19 are formed in end edges 17, 17 in the width direction (left-right direction; direction orthogonal to the walking direction). The connecting through hole 19 is formed at a position inside the end edge 17 by a length L ₀ in the width direction.

Further, at the front end portion (lower end portion) of the lower connecting portion 21, connecting through holes 25, 25 are formed at positions where the steps 10, 10 overlap with the connecting through holes 19 of the upper connecting portion 15 when they are stacked stepwise. Set up. Thus, coupling holes 25 and 25, like the connecting hole 19, is formed on the inner position by the length _{L 0} from the edge 23 of the width direction (left-right direction. Walking direction and the direction orthogonal) .

Similarly, connecting through holes 26 and 26 are formed in the base end portion (upper end portion) of the lower connecting portion 21 (above the connecting through hole 25). Similarly to the connection through hole 25, the connection through hole 26 is formed at a position inside the end edge 23, 23 by a length L ₀ in the width direction. The connecting through holes 26 and 26 are not used for connecting the steps 10 to each other, but are used only for connecting the steps 10 and the spar 47.

  The lower connecting portion 21, the tread plate 11, and the upper connecting portion 15 are integrally formed by bending a plate material. The steps 10, 10A, 10B mainly use striped steel plates (checker plates), but the material is arbitrary. The material of the landing member 40 described later is also the same.

  [3] Step (top) 10A, Step (bottom) 10B

The step 10A located at the uppermost stage is a member to which the landing member 40 is connected on the upper stage side. The step 10 </ b> A located at the uppermost step is formed with a lower connecting portion 21 obliquely on the lower edge 12 a side of the step board 11, similarly to the step 10, and is formed on the upper edge 12 of the step board 11. The connecting rib 31 directed downward is formed (FIG. 6). The lower connecting portion 21, the tread plate 11 and the connecting rib 31 are integrally formed by bending a plate material. The connecting rib 31 is formed at a right angle or a substantially right angle with the tread plate 11. Connection through-holes 33 and 33 are formed at positions on the inner side of the length L ₀ in the width direction from the end edges 32 at the end edges 32 and 32 (right and left end edges) of the connection rib.

Further, the step 10B located at the lowermost stage is a member to which the landing member 40 is connected to the lower stage side. The step 10B located at the lowest step is formed with an upper connecting portion 15 obliquely on the upper edge 12 of the step board 11 in the same manner as the step 10, and on the lower edge 12a of the step board 11 downward. A connecting rib 31 facing toward is formed (FIG. 6). The connecting rib 31 is formed at a right angle or a substantially right angle with the tread plate 11. The connecting rib 31, the tread plate 11 and the upper connecting portion 15 are integrally formed by bending a plate material. The connecting through holes 33 and 33 are formed in the width direction end edges 32 and 32 (right and left end edges) of the connecting rib 31 at positions inside the length L ₀ in the width direction from the end edge 32.

[4] Landing member 40

The landing member 40 is formed with connecting ribs 43 and 43 directed downward on the upper (walking direction) side edge and the lower (walking direction) side edge of the horizontal plate 41 similar to the tread board 11. Connecting ribs 43 are in the same structure as the connecting ribs 21, the connecting rib 43, in the width direction of the end edge (right and left end edges) 44, 44, the length L ₀ inner position in the width direction from the edge 44, connected Through holes 45 are formed. The connecting rib 43, the horizontal plate 41, and the connecting rib 43 are integrally formed by bending a plate material. The length of the horizontal plate 41 in the walking direction is arbitrary.

[5] Sasara girder 47

  The saddle girder 41 has the same shape as that of a normal sagittal girder, and has a structure in which the edges in the width direction of the steps 10, 10A and 10B and the landing members 40 and 40 can be contacted and fixed. 10B, through-holes 48 and 48 are previously drilled in accordance with the positions of the through-holes 3 and 3 of the second piece 1B of the connecting hardware 1 fixed to the landing members 40 and 40.

[6] Assembly of steel frame staircase 50

(1) The first piece 1A of the connecting hardware 1 is attached to the upper connecting through holes 26, 26 of the lower connecting portion 21 of each step 10, 10A, and the pins 55 are inserted into the communicating through holes 3, 26. Then, the connecting hardware 1 is fixed to the steps 10, 10A. The second piece 1B of the connecting hardware 1 is directed to the side beam 47 side.

(2) Subsequently, the uppermost step 10A is arranged on the spar 47, the through hole 3 of the second piece 1B of the connecting hardware 1 and the through hole 48 of the spar 47 are connected, and the bolt 56 is connected. It inserts from the through-hole 3 of the metal object 1, and the nut 57 is screwed and temporarily fixed (FIG. 6).

(3) Steps 10 and 10 are arranged in a stepwise manner on the step 10A, and the upper step 10A and the lower connection portion 21 of the upper step 10 and the upper connection portion 15 on the lower step side are arranged to overlap each other. Similarly, the through-hole 3 of the second piece 1B of the connecting hardware 1 and the through-hole 48 of the countersink 47 are communicated, and a bolt 56 is inserted from the through-hole 3 side of the connecting hardware 1 and a nut 57 is screwed together. Temporarily fix. At this time, the surface side of the upper coupling portion of the lower step contacts the back side of the lower coupling portion of the upper step (the opposite side of the walking surface) (FIG. 6).

(4) Subsequently, the lower connecting portion 21 and the upper connecting portion 15 that are in contact with each other are overlapped with the connecting through holes 25 and 19 that are in communication with each other, the first piece 1A of the connecting hardware 1 is overlapped, and the through hole 3 is further communicated. A pin 55 is struck into the connecting through holes 25 and 19 and the through hole 3 to integrally fix the lower connecting portion 21, the upper connecting portion hole 15, and the first piece 1A. At this time, the second piece 1B of the connecting hardware 1 is similarly directed to the side of the spar 47, and the bolt 56 is inserted into the through hole 3 of the second piece and the spar 47 of the connecting spar 47 to insert the nut. 57 is screwed and temporarily fixed (FIGS. 4 and 5).
At this time, the right angle end 2 of the connecting hardware 1 is located at the boundary between the surface of the counter beam 47 and the end edge 17 of the upper connecting portion 15 (the end edge 23 of the lower connecting portion 21). It can be held in a state where the right angle of the abutting portion is maintained.

(5) Thereafter, the steps 10, 10, 10B are similarly attached, and the upper connecting portion 15 of the lowermost step 10B is fixed to the lower connecting portion 21 of the upper step 10 with a pin 55 (FIG. 6). .

(6) Subsequently, on the upper stage side, the landing members 40, 40 are arranged following the connecting rib 31 of the uppermost step 10A. The connecting rib 31 and the connecting rib 43 of the landing member 40 are overlapped, and the connecting ribs 43 and 43 of the landing member 40 are overlapped. The metal fittings 1 and 1 are arranged on both sides of the overlapping connection ribs 31 and 43 and sandwiched between the first piece 1A and the first piece 1A. Subsequently, the through-hole 3 of the first piece 1A, the connecting through-hole 33 of the connecting rib 31 and the connecting through-hole 45 of the connecting rib 43 are communicated, and the pin 55 is hit, and the second piece 1B, the connecting rib 31 (the connecting rib 31) 43), the connecting rib 43 and the second piece 1B are fixed.
At this time, since the second pieces 1B and 1B of the respective connecting hardware 1 are similarly facing the side of the spar 47, the bolt 56 is connected to the through hole 3 of the second piece 1B and the through hole 48 of the spar 47. Are connected, and the nut 57 is screwed and temporarily fixed.

(7) Similarly, on the lower stage side, the landing rib members 40 and 40 are arranged next to the connecting rib 31 of the lowermost step 10B, the connecting ribs 31 (43) and 43 are overlapped, and the overlapping connecting rib 31 ( 43) The both sides of 43 are pinched | interposed with the 1st piece 1A of the connection hardware 1 and 1. FIG. Subsequently, the first piece 1A, the connecting rib 31 (43), and the connecting rib 43 hit the pin 55 in the connecting through holes 33 and 45 and the through hole 3 communicated, and the first piece 1A, the connecting rib 31 (43), The connecting rib 43 and the first piece 1A are fixed.
At this time, since the second pieces 1B and 1B of the respective connecting hardware 1 are similarly facing the side of the spar 47, the bolt 56 is connected to the through hole 3 of the second piece 1B and the through hole 48 of the spar 47. Are connected, and the nut 57 is screwed and temporarily fixed.

(8) The bolt 56 and the nut 57 that are temporarily fixed are finally tightened to constitute the steel step 50. A portion where the steps 10A, 10 and 10B are continuous is a staircase 51, and a portion where the landing members 40 and 40 are continuous is a landing 53 (FIG. 1).

(9) In the assembly, the landing members 40, 40 sandwich the first pieces 1A, 1A of the connecting hardware 1, 1 from both sides of the overlapping connecting ribs 43, 43, and the second pieces 1B, 1B are spar 47 was ligated with (first method) is, the edge 41a to the horizontal plate 41 of the landing member 40, by bored connection hole 42 to the _{L 0} inner position in the width direction from 41a, the lower surface of the horizontal plate 41 It is also possible to connect and fix the first piece 1A of the connecting hardware 1 and the second piece 1B to the spar 47 (second method, FIG. 8). The second method is optimal for the landing member 40 at the separate end, but is optional, such as using the first method and the second method alone or in appropriate combination.

  Moreover, in the said assembly, although the staircase part 51 was fixed to the stool 47, and the upper and lower landings 53 and 53 were assembled next, the order is arbitrary.

  Further, in assembling the stepped portion 51, the connecting hardware 1 is fixed to the connecting through hole 26 of the lower connecting portion 21 of each step 10, 10 </ b> A, and the steps 10, 10 </ b> A are overlapped first. 10A was fixed to the spar 47 and the upper and lower steps 10 and 10A were fixed later, while the upper and lower steps 10 and 10A were stacked to overlap the first piece 1A of the connecting hardware 1. At the same time, the second piece 1 </ b> B of the connecting hardware 1 can be fixed to the spar 47.

  Further, in the above assembly, after assembling the steps 10, 10A, 10B and the landing member 40 (after forming the staircase 51 and the upper and lower landings 53, 53), these are fixed by sandwiching the spar 47, 47, and the steel frame The staircase 50 can also be configured.

  Further, in the assembly, the pins 55 are used to connect the steps 10, 10 </ b> A, 10 </ b> B to each other and to the first piece 1 </ b> A of the connection hardware 1, and to connect the second piece 1 </ b> B of the connection hardware 1 and the spar 47. The bolt 56 and the nut 57 are used, but the means for connection is arbitrary (not shown).

  Thus, in the steel step 50 using the step 10 and the connecting hardware 1 of the present invention, it is possible to eliminate the welding work and to assemble by employing various processes according to the situation at the site.

[7] Other embodiment (variation of structure)

In (1) above embodiment, and formed with short, L ₁ the upper communication sintered portion 15 has been overlaid on the connecting portion 15 in the step 10, 10 located above and below only the lower side of the lower connecting portion 21 ( 4), as the upper connecting portion height L ₂ similar to the lower connection portion 21 the height of 15, it is also possible to configure the stepped portion 51 overlapping the entire upper connecting portion 15 and the lower coupling portion 21 (FIG. Not shown).

(2) Moreover, in the said Example, when the width | variety of step 10,10A, 10B is long, the connection through-hole 19a connected also to the intermediate part (step width direction) of the upper connection part 15 and the lower connection part 21. 26a can also be drilled (shown in FIG. 2 (b) by chain lines). In this case, similarly, the upper connecting portion 15 and the lower connecting portion 21 can be fixed and reinforced by hitting the pin 55 in the connecting through holes 19a and 26a communicating with each other. In this case, the first piece 1 </ b> A of the connection hardware 1 can be overlapped and fixed from the back side (not shown), but the second piece 1 </ b> B of the connection hardware 1 does not come into contact with the sheath beam 47.

(3) Moreover, in the said Example, the connection through-hole 26 was formed in the position which does not overlap with the upper connection part 15 of the other step 10 upper side (step board 11 side) of the step 10 lower step 21. Therefore, although the step 10 can be fixed to the sheathing girder 47 alone, the connecting through hole 26 can be omitted (not shown).

(4) Further, in the above embodiment, since the respective connecting holes 19,25,26,33,42,45 formed from the width direction of the edge in _{L 0,} may efficiently use the connection hardware 1 in common Although the assembly is possible, the positions of some of the connecting through holes can be changed (not shown).

(5) Moreover, in the said Example, since the diameter of the volt | bolt 56 generally fixed and used with the sheathing girder 55 is larger than the pin 55 used for fixing the steps 10 with each other,
Diameter of the through hole 3 of the first piece 1A (for fixing the steps 10)
<It is the diameter of the through-hole 3 of the second piece 1B (for contact with the counter beam 47) (FIG. 3). Thus, when forming, since the point of use and the first piece 1A and the second piece 1B is distinguished, the distance L ₀ from the right angle end 2 up hole 3 in the second piece 1B is be any (Not shown). Also, in this case, the tip portions of the first piece 1A and the second piece 1B can be distinguished by touching them with different shapes (for example, the first piece 1A is a current semicircle and the second piece 1B is a rectangle). (Not shown).

(6) Moreover, in the said Example, the member which interrupts | blocks or absorbs vibrations, such as a rubber plate, is interposed in the surface which overlaps the connection rib 43 etc. of the upper connection part 15, the lower connection part 21, and the landing stage member 40 of a step. You can also Similarly, at the position where the bolt 56 and the pin 55 with the connection hardware 1 are used, a similar rubber washer or the like can be used for the contact portion. By processing in this way, vibration (sound) is absorbed at each joint and can be attenuated, which is preferable.

DESCRIPTION OF SYMBOLS 1 Connection hardware 1A 1st piece of connection hardware 1B 2nd piece of connection hardware 2 Right-angle end of connection hardware 3 Through hole 10 of connection hardware 10A step 10A Step (top step)
10B Step (bottom)
11 Treadboards 12, 13 Ends 15 in the walking direction of the treads Upper connection part 16 Upper end (tip) of the upper connection part
17 End in the width direction of the upper connecting portion 19 Connecting through hole 21 in the upper connecting portion Lower connecting portion 22 Lower end (tip) of the lower connecting portion
23 End in the width direction of the lower connecting part 25 Connecting through hole in the lower connecting part (bottom)
26 Connecting hole (upper) of lower connecting part
31 Connecting rib 32 End of connecting rib in width direction 33 Connecting rib connecting through hole 40 Landing member 41 Horizontal plate 41a of landing plate member Horizontal end of horizontal plate 42 Horizontal plate connecting through hole 43 Connecting rib of connecting landing member 44 Rib width direction end 45 Connecting rib connecting through hole 47 Sasara girders 48 Sasara girder through holes 50 Steel stair 51 Steel stair stair 52 Steel stair stair kick 53 Steel stair landing 55 Pin 56 Bolt 57 nut

Claims (3)

Hold both ends of the step group with metal steps arranged in a staircase shape, and fix the step group and the stepped girder with a common connecting hardware. An assembled steel staircase characterized by comprising.
(1) The step is at least one step, and the upper connecting portion is continuously connected to the upper edge of the tread plate portion with the upper connecting portion facing upward, and the lower connecting portion is directed downward to the lower edge of the tread plate portion. To connect.
(2) The step group is configured by overlapping a lower connection portion of a step located in an upper step and an upper connection portion of a step located in a lower step, and the lower connection portion and the lower step side of the upper step side. A connecting through hole communicating with the upper connecting portion is formed.
(3) The connecting hardware is formed of a second piece fixed to the sheathing girder and a first piece fixed to the step. The base end of the first piece and the base end of the second piece are connected at a substantially right angle, and the connected base end is defined as a right end.
(4) The second piece of the connecting hardware and the counter girder are joined with a fixed bar, and the through hole of the first piece of the connecting hardware is connected to the connecting through hole and joined with the fixed bar. The distance from the left and right end edges of the step up connection hole as L _0, assembled steel staircase according to claim 1, wherein the distance from the right-angled end of the coupling hardware to hole was L _0. The assembled steel staircase according to claim 1, which is configured as follows .
(1) The step group consists of the upper connection part of the step located in the lower stage, only on the lower side of the lower connection part of the step located in the upper stage,
On side of the lower connecting portion (2) the step, located on the lower part form a moiety connecting portion does not overlap on the rung, the portion which is not heavy, bored the second connection hole.

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