JPH0626160A - Method and device for assembling steel staircase - Google Patents

Abstract

PURPOSE:To assemble a steel staircase with higher efficiency by installing stair tread materials in a horizontal state. CONSTITUTION:A specified number of L-shaped stair tread materials 83 in their cross section are set up horizontally in parallel to each other at an equivalent span on a stair tread setting up device 53. When they are set up, a curved top 86 formed by treads 84 of the stair tread materials 83 and riser boards 85 is placed upside down. What is more, they are set up so as to keep horizontal a line which connects the edges 84a of the treads 84 to the edges 85 of the riser boards 85. Inner sides of open strings 88 are placed into contact with the both ends on the fixing side of the tread board 83, thereby fixing the tread materials 83 with the strings 88 and assembling a steel staircase.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for assembling a steel staircase in which a steel girder and a tread are connected and fixed to form a steel staircase.

[0002]

2. Description of the Related Art A steel staircase has a tread 102 and a riser 10.
The tread material 101 having a substantially L-shaped cross section composed of 3 and 3 is fixed to the sassar girders 104 and 105. Also,
Since the height of the riser plate of the steel staircase is determined with an accuracy of 1 mm or less according to the floor height of the building to be installed, the conventional method of assembling the steel frame staircase is as follows. One of the sasara girders 104 indicating the position of the tread material is placed horizontally. The tread materials 101, 101 are placed in parallel on the sasara girder 104 in an upright state. The other Sasara girder 105 is a crane (not shown)
And hang it down in the direction of the arrow 106 (Fig. 11 (a)
(B)), It mounts on this tread material 101,101. The other Sasara girder 105 and the end edge portion 10 of each tread material 101
1a and 1 are fixed. The other sasara girder 105 to which the tread material 101 is fixed is lifted by a crane or the like to be inverted and placed with the other sasara girder down (FIG. 11 (c)). One Sasara girder 104 is a crane (not shown)
And hang it down in the direction of the arrow 107 and tread material 101, 1
Place it on 01. On the other hand, the sasara girder and the edge portion 101b of the one tread material 101
Fix and.

[0003]

SUMMARY OF THE INVENTION In the above conventional technique,
Since the weight of sasara girder (about 300Kg) is heavy, when installing the sasara girder or the sasara girder with the tread installed at a predetermined position, the crane must be repeatedly used or a large number of workers are required. There was a problem that work efficiency was poor. There was a problem in that the work efficiency was particularly poor because automation was not performed when assembling the tread materials of different shapes and sizes.

[0004]

SUMMARY OF THE INVENTION However, according to the present invention, a predetermined number of tread materials are installed in parallel in the horizontal direction so that the distance and angle can be adjusted, and the sasara can be fixed to the tread materials. Solved.

That is, according to the present invention, in a method of assembling a steel frame staircase by connecting a predetermined number of tread materials and a sasara girder, a predetermined number of tread materials are installed in parallel in the horizontal direction at the same interval, and the fixed side of the tread material is fixed. This is a method for assembling a steel frame staircase, characterized in that the tread plate material and the sasara girder are fixed by abutting the inner surfaces of the sasara girder on both ends. Further, the tread material has a substantially L-shaped cross section composed of a tread plate and a riser plate, and the bent tops of the tread plate and the riser plate of the tread plate material face downward, and the end edge of the tread plate and the end edge of the riser plate. This is a method of assembling a steel frame staircase, which is characterized in that the line connecting to and is set horizontally.

Further, a transfer device is installed on the first base for reciprocating and moving up and down by placing a predetermined number of tread materials at predetermined intervals, and the transfer device is adjacent to the first base. , A second base is installed on the forward side, and a tread material installation device that supports the tread material conveyed by the above at an assembly regulation position is installed on the second base, and the second base is installed. A sasara girder support device is provided on each side of the tread material installation device of the stand, and a third girder is installed on the third girder, and the inner surface of the sasara girder can be abutted and moved on both sides of the tread material. It is a steel stair assembly device characterized by being installed.

Further, the transfer device can place a pallet on which a tread material can be placed on the first base and move it in parallel between the tread material replenishment position and the tread material installation device position. A pallet with a tread material placed on one side of the tread material replenishment position is provided with a conveying means for lowering the pallet at the tread material installation device position and raising the pallet at the tread material replenishment position. In the steel frame stairs assembling apparatus, a tread material supplying means for supplying to the carrying means is installed, and a pallet receiving means for removing a pallet from the carrying means is installed on the other side of the tread material replenishing position.

Further, the tread material installation device is a steel frame stair assembly device in which a predetermined number of tread material support pedestals capable of mounting one tread material on a second base are installed in parallel so as to be mutually spaced.
Further, the tread material installation device is a steel frame stair assembly device in which a tread material abutting plate is fixed to a rotating shaft laterally provided at the upper end of the tread material supporting frame, and the tread material abutting plate is connected to a rotating means. is there.

Further, in the sasara girder supporting device, substrates which can be separated from and contact with the tread material are installed on both sides of the tread supporting device on the third base, and horizontal and vertical positions are held on the substrates. Support the base end of the swing arm as much as possible, at the tip of the swing arm,
The apparatus for assembling a steel frame staircase is provided with a sasara girder holding means capable of holding the sasara girder in a vertical state at the vertical position of the swing arm. Further, the swing arm is a device for assembling a sasara girder and a tread, which is composed of a lower member whose base end is rotatably attached to a shaft and an upper member whose length is adjustable to the tip of the lower member. is there.

[0010]

The transport means allows a predetermined number of tread material to be placed on the tread material installation device. The tread material installation device can support the tread material by rotating the abutting portion with the bent top down and the line connecting the edge of the tread and the edge of the riser being horizontal.
Further, the tread material installation device can install tread materials at predetermined intervals. Further, the supporting device for the sasara girder can abut the inner surface of the sasara girder at a predetermined position of the tread material.

[0011]

【Example】

<1> The configuration of an apparatus according to an embodiment of the present invention will be described with reference to the drawings.

(1) Constitution of Conveying Device Rails 2 and 2 are installed in parallel on the first base 1, and a pedestal 3 that can move on the rails 2 and 2 is installed. The pedestal 3
A pallet pedestal 4 on which a pallet 5 can be placed is installed via a cylinder (not shown) so that it can be moved up and down. Further, a rack gear 9 is installed on the first base 1 in parallel with the rails 2 and 2, and a motor 7 for automatic transportation is installed on the mount 4, and a pinion 9a connected to the motor 7 is bitten on the rack gear 9. Together, the transport means 8 is configured.

A stepping plate material replenishing position 1 on one side of the conveying means 8
On one side 10a of 0, mounts 12, 12 are installed in a direction perpendicular to the rails 2, 3, and the pallet supply rod 1 is mounted on the mount 12.
The cylinder 4 is attached to the conveying means 8 by a cylinder 15 so as to be separable from and in contact with the conveying means 8. In addition, the other side 1 of the tread material replenishment position 10
0b in the direction perpendicular to the rails 2, 2
And a pallet receiving rod 19 is attached to the pedestal 17 by a cylinder 20 so that the pallet receiving rod 19 can be attached to and detached from the conveying means 8. In addition, the motors and cylinders are connected to an automatic control device.

The transport device 11 is constructed as described above. In FIGS. 1 and 2, 13 is a tread material stock portion, and 18 is an empty pallet stock portion.

(2) Structure of the tread material installation device Further, adjacent to the first base 1 and the transfer means 8
A second base 21 is installed on the forward direction side of, and is parallel to the rails 2 on the second base 21 and the transport means 8
The rails 22, 22 and the rack gear 24 are installed in parallel on the extension line of the forward direction. A predetermined number of tread material support mounts 25 and tread material support mounts 25a for reference ends are arranged on the rails 22, 22.

The support pedestal 25 has slide bearings 26, 26 at abutting portions with the rails 22, 22, and a traveling motor 28 having a pinion 27 engaged with the rack gear 24 connected thereto is installed. A shaft 29, in which a spiral gear 30 is fitted and inserted in a direction perpendicular to the rails 22 and 22, is supported on the upper end portion of the tread material support frame 25, and spur gears 31 and 31 are fitted to both ends of the shaft 29. . A shaft 33 is installed on the tread material support frame 25 in parallel with the shaft 29, and a disc-shaped tread material contact plate 32 having teeth engaging with the flat gear 31 on the outer periphery is fitted and fixed to the shaft 33. . The tread material contact plate 32 has a predetermined angle (an angle corresponding to the angle of the bent top of the tread material, usually 8
2 °) fan-shaped notch. Further, a plate-shaped tread plate contact piece 34 is connected and fixed to the tread plate contact plate 32 of the shaft 33. In addition, the spline 35 is installed in the tread supporting material 25.
Receiving piece 3 that is inserted through and fixed to each tread plate support frame 25
6, the spline 35 is supported, and a spiral gear 37 that engages with the spiral gear 30 is fitted to the spline 35. The tread material support stand 25 is configured as described above.

Further, on the tread material support mount 25a for the reference portion, a pulley 39 is fitted on the shaft of a rotary encoder 38, and a pulley 40 is fitted on the shaft 29, on the tread material support mount 25. 39, 40 belt 41
The rotary encoder 38 rotates the shaft 29.
To A sprocket 44 is fitted and fixed to the shaft of the spiral gear 37. Sprocket 46 connected to shaft of CB motor 45, sprocket 4 of reduction gear 47
8, 49, the sprocket 44 to the chain 50, 51
Connect with.

Further, a connecting rod 52 is provided laterally along a predetermined number of the tread material supporting frames 25 and side surfaces of the tread material supporting frame 25a for the reference portion, and the connecting rods 52 are fixed to the base 22. . The tread material installation device 53 is configured as described above (FIGS. 1, 3, and 4). 5 and 6, reference numeral 43 is a limit switch for setting the angle, and 43a is an origin dock for setting the angle. Further, reference numeral 42 in FIG. 3 denotes a limit switch for setting the interval, and 42a denotes an origin dock for setting the interval. Further, the limit switch 43, the origin dock 42a, the rotary encoder 38, the motors, and the cylinders are connected to an automatic controller (not shown). Further, reference numeral 31a in the drawing denotes a spur gear that is juxtaposed with the spur gear 31, and only meshes with the tread material contact piece 32.

(3) Structure of Sasara girder support device Next, the third bases 55, 55 are installed on both sides of the tread material installation device 53 adjacent to the second base 22, and Rails 56, 56 are installed on the three bases 55, 55 in parallel and orthogonal to the rail 23, respectively. A rack 57 is attached to the rail 56. The rail 5
Substrates 58 are placed on the respective substrates 6, and a traveling motor 60 having a pinion 59 connected to a shaft is installed on the substrate 58, and the pinion 59 meshes with the rack 57.

The lower member 6 of the swing arm 61 is mounted on the substrate 58.
2 is fixed to the shaft 63, and the swing arm 6 is attached to the base end of the lower member 61.
A tilting cylinder 79 is connected so that 1 can hold the vertical state and the horizontal state. A worm jack 64 is installed on the lower member 62, and a screw rod 66 at the tip of the upper member 65 of the swing arm 61 is engaged. An elevating motor 67 for moving the warm jackies 64 is installed on one lower member 62, and operates both the warm jackies 64 via an interlocking rod 68.

The upper members 65, 65 are connected to each other by a horizontal rod 69 (installed at a position orthogonal to the rail 56), and support members 71, 71 having a slide bearing 70 at the lower end are slidable on the horizontal rod 65. It is installed freely. The supporting portion 71 is connected to the traverse motors 72 fixed to both ends of the horizontal rod 65 by screw rods 73. Further, the supporting portion 71 is provided with a sasara girder holding portion 75 which is pressed by the pressure cylinder 74 toward the side of the tread material holding device. The sasara girder holding portion 75 has a sassar girder contact piece 76 at the upper end and a holding claw 78 that is opened and closed by a cylinder 77 at the bottom (FIG. 7).

As described above, the sasara girder support device 80
(FIGS. 7, 8, and 9). In FIG. 1 and FIG. 2, 81 is a Sasara girder stock stand. Also, each cylinder and each motor are connected to an automatic control device (not shown).

As described above, a steel frame stairs assembling device 82 is constituted by the transporting device 11, the tread material installing device 53, and the sasara girder supporting device 80.

<2> Next, the use and assembling method of the steel frame stair assembling apparatus 82 of the present invention based on the above embodiment will be described.

(1) Structure of Steel Frame Stairs First, the components of the steel frame stairs will be described. In FIG. 10B, the tread material 83 has a substantially L-shaped cross section in which the tread plate 84 and the riser plate 85 are connected to each other and the connecting point is a bent top 86. Further, the tread material 83 has mounting nuts 87 fixed to both end portions on the mounting side of the sasara girder. Further, a mounting hole 90 is formed in the sassar girder 88 at the position of the mounting nut. Further, the surface of the sasara girder 88 on the side where the tread material 83 is attached is referred to as an inner surface 89.

In the above, the bent top portion 86 of the tread material 83
With the line connecting the end edge 84a of the tread plate 84 and the end edge 85a of the riser plate 85 being horizontal, the tread length A ₁ of the tread plate 84 of the tread material 83 (usually 250
mm), the length B _{1 of} the riser plate 85, and the angle θ ₁ formed by the step plate 84 and the riser plate 85 (usually fixed at 82 °),
The angle α ₁ formed by the horizon and the tread 84, the horizon and the riser 8
The angle β ₁ (= 180 ° −θ ₁ −α ₁ ) formed by 5 and the length L ₁ between the edge 84 a of the tread plate 84 and the edge 85 a of the riser plate 85 can be calculated. In the above, L ₁ is the installation interval of the tread material support pedestals 25 and 25a, and the tread material support pedestal 25
The distance of each tread material support stand 25 from a (origin) is set. Further, the angles α ₁ and β ₁ are equal to the tread plate contact plates 34, 32.
And θ ₁ is the angle formed by the inner edges of the tread plate contact plates 34, 32 (the angle of the fan-shaped cut of the tread plate contact plate 32) θ ₁ .

Further, in the above, the length B ₁ of the riser plate 85, the length B ₁ and the number of stages of the plate 85 riser the most appropriate length from floor height of a given steel staircase installation position (the step board material number)
And the angle α ₁ and the angle β ₁ are determined by the automatic control device.

(2) Use of the assembly device 82 (assembly method)
About a predetermined number of tread materials 83 are placed on the pallet 5 at substantially the same intervals with their bent tops 86 facing down. A large number of the pallets 5 containing the tread materials are placed on the tread material stock section 13.
Further, the sasara girder 88 is placed in parallel with the sasara girder stock bases 81, 81 with the inner surface facing upward.

The pallet 5 is placed on the pallet supply rod 14, moves in the direction 91 shown in FIG. 1, and the pallet 5 is placed on the pallet pedestal 4 at the tread material replenishment position 10, and the rail 7 is moved on the rail 2 by the operation of the motor 7. The pallet 5 is moved in the direction indicated by the arrow 92 in FIG. 1 and the motor 7 is stopped while the pallet 5 is located above the tread material installation device 53 (FIG. 1). Next, the pallet support 4 is lowered and the tread material 83 is placed on the tread material installation device 53. Next, by the operation of the motor 7, the pallet receiving base 4 moves on the rail 2 in the direction of the arrow 93 while the empty pallet 5 is placed. The empty pallet 5 is moved by the pallet receiving rod 19.
It is stored in the empty pallet stock section 18.

Through the above steps, the tread material 83 is placed on the tread material supporting device 53 in a state of being supported by the tread material abutting plates 32 and 34 of the tread material supporting base 25. Next, the CB motor 45 of the tread material support stand 25a is rotated, and the rotation is performed by the sprocket 46, the chain 50, and the sprocket 4.
It is transmitted to the speed reducer 47 via 8, and is decelerated and transmitted to the spline 35 via the sprocket 49, the chain 51, and the sprocket 44 (FIG. 6). By the rotation of the spline 35, the spiral gears 37 of all the tread material support mounts 25, 25a rotate in the same manner, and the rotation thereof causes the flat gear 31 to rotate via the spiral gear 30, and the tread material contact plate 32,
Rotate 34. Then, with the angle of the tread plate contact plates 32, 34 input in advance, the CB motor 45
To stop. In this state, the line connecting the end edge 84a of the tread plate 84 of the tread material 83 and the end edge 85a of the riser plate 85 is horizontal.

At the same time, the tread supporting members 25, 2
5a moves on the rail 22 in the direction of the arrow 94 by the rotation of the traveling motor 28, so that the tread plate support bases 25, 25a
So that the interval is a predetermined interval L ₁ that is input in advance,
The rotation of the traveling motor 28 is stopped at the position where the predetermined interval ₁ is reached by the operation of the limit switch 42 and the origin dock 42a (FIG. 3).

The supporting portion 71 of the sasara girder supporting device 80,
Traverse motor 7 so that 71 is at a predetermined interval and position
2 is operated to move on the horizontal rod 73. The positions of the supporting portions 71, 71 in the above are determined by the shape, length, contact position with the stair member, etc.

Next, the tilting cylinder 79 is operated,
The oscillating arm 61 is brought into a horizontal state (position 61a in the chain line in FIG. 7), the traveling motor 60 is operated, and the arrow 95 in FIG.
Move to the direction and Sasara girder 88 of Sasara girder stock base 81
Is inserted between the sasara girder contact piece 76 and the sandwiching claw 78, and the operation of the cylinder 77 causes the sandwiching claw 78 and the salsa girder supporting portion 7
The sasara 88 is sandwiched by 5.

Next, the traveling motor 60 is operated, and as shown in FIG.
The cylinder for moving up and down 7
9 is operated to make the swing arm 61 in a vertical state, and the traveling motor 60 is stopped in a state where the sassar girder 88 is located near the tread material 83.

Next, the lifting / lowering motor 67 of the sasara girder support device 80 is operated, the warm jackie 64 is operated through the interlocking rod 68, and the screw rod 66 is rotated up and down to swing the arm 6.
The space between the lower member 62 and the upper member 65 of 1 is adjusted so that the sassar girder 88 can contact the predetermined position of the tread material 83.

Next, the pressure cylinder 74 is operated to press the sassar girder 88 to a predetermined position on the step material 83.

Next, with a bolt tightening device (not shown), a bolt (not shown) is inserted through the mounting hole 90 of the sasara girder 88, and is screwed and fastened to the mounting nut 87. This completes the assembly of the steel stairs.

Further, the above-mentioned operation is performed by inputting the tread material 8 in advance.
Based on the data of the shape of 3 (the tread length A ₁ , the length B _{1 of} the riser plate 85, the angle θ ₁ between the tread plate 84 and the riser plate 85, and the width of the tread plate material), the tread plate is automatically controlled. The operation of the material support device 53 is controlled, and the transport device 11,
The operation of the steel frame stair assembly device 82 such as the sasara girder support device 80 is collectively controlled.

(3) Configuration of Other Embodiments In the above, a case where the steel frame stairs 97a are assembled by using the tread material 83a and the sasara girder 88a having different shapes will be described. 10A and 10B, the tread material 8
3a bent top portion 86a and the bottom of, in a state where the line connecting the edge of the plate riser and the end edge of the tread plate is installed such that the horizontal, the tread length A ₂ (A1 of step board of the tread plate member 83a Same 2
50 mm), the length B ₂ of the riser plate 85, and the angle θ ₂ formed by the step plate and the riser plate (82 °, which is the same as θ ₁ ), the angle α ₂ formed by the horizontal line and the step plate 84 is the same as the above. The angle β ₂ formed by the riser plate 85 and the length L ₂ between the end edge of the tread plate and the end edge of the riser plate 85 can be calculated.

In the above, L ₂ is a tread material support stand 25,
After the installation interval of 25a is reached, the traveling motor 28 is rotated a predetermined number of times to set the distance L ₂ of each tread material support pedestal 25 from the tread material support pedestal 25a (origin). Further, the angles α ₂ and β ₂ become the set angles of the tread plate contact plates 34 and 32, and the CB motor 45 is rotated a predetermined number of times to rotate the tread plate contact plates 34 and 32 to contact the tread plate materials. Boards 34, 3
The angle formed by the inner edge of 2 is θ ₂ . Therefore, the tread material 83a
When the bent top portion 86a of the above is installed so that the line connecting the end edge of the tread plate and the end edge of the riser plate is horizontal,
By adjusting the contact angle of the bent tops 86a, the bent tops 8a and 8b
It only moves horizontally in the interval of 6a, and the tread material 83a
Can be installed in place.

Further, in the above embodiment, the tread material for the end portion connected to the landing or the like may be different in shape and size from the other tread material 83 (the tread material shown by the chain line in FIG. 10 (a)). Material 83b). In this case, the tread material support mount 25b for the end of the tread is installed at a predetermined position on the rail 22 (shown by the chain line in FIGS. 3 and 4). The tread support 25b
Is a rotation means (not shown) such as a manual handle without inserting the spline 35 of the tread material support stand 25.
Is connected to the spiral gear 37, and an elevating means (not shown) capable of adjusting the mounting height of the tread plate contact plates 32, 34 is provided. Therefore, the tread support 2
The tread material contact plates 32 and 34 of 5b are the tread material support bases 2
It does not interlock with the tread material contact plates 32 and 34 of 5 and 25b.
Further, in the tread material support pedestal 25b, the rotating means of the spiral gear 37 is connected to the power of a motor or the like, the motor is connected to an automatic control device, and the tread material support pedestal 2 is installed.
It can also be controlled integrally with 5, 25a.

Further, in the above-described embodiment, the method of arranging the tread material 83 in parallel with the bent top portion 86 facing downward and the tread material installing device have been described, but the tread material 83 may be similarly assembled with the bent top portion 86 facing up. In this case, the tread plate contact plates 32, 34 are shaped to support the tread plate with the bent top portion 86 facing upward (not shown).

[0043]

EFFECTS OF THE INVENTION Since the tread material is installed horizontally, and the intervals and angles can be automatically adjusted accurately for assembly work, the work efficiency can be improved, and the parts can be carried in and the completed steel frame stairs can be carried out. Besides, the number of workers can be reduced without using a crane. Therefore, there is an effect that the steel frame stairs can be assembled with high efficiency and efficiency.

[Brief description of drawings]

FIG. 1 is a plan view of the device of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a side view of the tread plate installation device used in the embodiment of the present invention.

FIG. 4 is a plan view of the same.

FIG. 5 is a front view of the tread material support frame.

FIG. 6 is a front view of a tread material support frame for the reference end portion.

FIG. 7 is a front view of the sasara girder support device used in the embodiment of the present invention.

FIG. 8 is a side view of the same.

FIG. 9 is a plan view of the same.

FIG. 10A is a side view of a tread, and FIG. 10A is an enlarged side view of the same.

FIG. 11 is a view for explaining a conventional method for assembling a steel frame staircase,
(A) is a perspective view (b), is a front view, and (c) is a front view of another process.

[Explanation of symbols]

 1 first base 4 pallet cradle 5 pallet 7 motor 8 transfer means 9 rack 9a pinion 10 tread plate replenishment position 11 transfer device 14 pallet supply rod 18 pallet receiving rod 21 second base 24 rack 25, 25a tread plate material Support stand 27 Pinion 28 Traveling motor 32, 34 Tread plate abutment plate 52 Connecting rod 53 Tread plate installation device 55 Third base 56 Rail 57 Rack 58 Board 59 Pinion 61 Swing arm 63 Shaft 64 Warm jackie 75 Sasara girder Support part 76 Sasara girder abutment piece 78 Clamping claw 79 Lifting cylinder 80 Sasara girder supporting device 82 Steel stairs assembling device 83 Tread plate material 84 Tread plate 85 Kicking plate 86 Bending top part 88 Sasara girder 89 Inner surface (Sasara girder)

Claims (8)

[Claims] 1. In a method of assembling a steel frame stairway by connecting a predetermined number of tread boards and a sasara girder, a predetermined number of tread boards are installed in parallel in the horizontal direction at the same interval, and the tread boards are fixed to both ends on the fixed side. A method for assembling a steel staircase, comprising abutting an inner surface of a girder to fix the tread material and the sasara girder. 2. The tread material has a substantially L-shaped cross section composed of a tread and a riser, the bent tops of the tread and the riser of the tread are down, and the end edge of the tread and the riser. The method for assembling a steel frame staircase according to claim 1, wherein the line connecting the edge of the steel stair is set horizontally. 3. A transfer device for reciprocating and moving up and down by placing a predetermined number of tread materials at a predetermined interval on a first base, and adjacent to the first base, the transfer device. , A second base is installed on the forward side, and a tread material installation device that supports the tread material conveyed by the above at an assembly regulation position is installed on the second base, and the second base is installed. A sasara girder support device is provided on each side of the tread material installation device of the stand, and a third girder is installed on the third girder, and the inner surface of the sasara girder can be abutted and moved on both sides of the tread material. An assembly device for steel stairs, which is characterized by being installed. 4. A transfer device is provided with a pallet on which a tread material can be placed on a first base, and can be moved in parallel between a tread material replenishment position and a tread material installation device position.
A pallet having a tread material placed on one side of the tread material replenishing position is provided with a conveying means for lowering the pallet at the tread material installing device position and raising the pallet at the tread material replenishing position. The steel frame stairs assembling apparatus according to claim 3, further comprising a tread material supplying means for supplying to the conveying means, and a pallet receiving means for removing a pallet from the conveying means on the other side of the tread material replenishing position. 5. The steel staircase according to claim 3, wherein the tread material installation device has a predetermined number of tread material support pedestals capable of mounting one tread material on the second base and arranged in parallel so as to be freely spaced from each other. Assembly equipment. 6. A tread plate material installation device is characterized in that a tread plate material contact plate is fixed to a rotary shaft laterally provided at the upper end of a tread plate material support frame, and the tread plate material contact plate is connected to a rotating means. Assembling device for the steel stairs described. 7. A Sasara girder support device is provided with a substrate which is detachable from and contactable with a tread material on both sides of the tread support device on a third base, and holds a horizontal position and a vertical position on the substrate. 4. A sasa girder pinching means capable of supporting a base end part of a swaying arm as much as possible and attaching a sasa girder clamping means capable of holding a sasa girder in a vertical state at a vertical position of the swaying arm to a tip part of the swaying arm. Assembly equipment for steel stairs. 8. The sara according to claim 7, wherein the swing arm is composed of a lower member whose base end is rotatably attached to a shaft and an upper member whose length is adjustable to the tip of the lower member. Assembly equipment for girders and treads.