KR101560676B1 - spiral stair case - Google Patents

Abstract

The present invention relates to an assembly type spiral stairs precisely and freely controlling a height between footholds to simply be assembled and installed in a construction site having a different inter-layer height. The present invention comprises: a base fixated to a floor; a center pole of which a lower end is installed in the base; a plurality of spacers inserted into the center pole; the foothold inserted into the center pole between the spacers; an outside stringer disposed on one side of the foothold; and a coupling member coupling an other side of the foothold and the outside stringer.

Description

{Spiral stair case}

The present invention relates to a prefabricated spiral step that can be freely and finely adjusted in height between a scaffold and a scaffold and can be easily assembled even in a construction site having a different height between the scaffolds.

The stairs are divided into straight stairs and curved stairs.

A straight staircase is a straight staircase.

The curved staircase is divided into a spiral stair case with a center pole and a double helical stair without a center pole.

Unlike the double-spiral staircase, the spiral staircase can be assembled at the construction site such as Patent Document 1 and Patent Document 2. [

1 and 2, the prefabricated spiral step 1 of Patent Document 1 includes a post 2 vertically erected and fixed by an anchor bolt 3 and made to have a height corresponding to the height of the layer, A spacer-bushing 5 fitted to the post 2, a footplate 4 fitted to the post 2 alternately with the spacer-bush 5, A bracket 7 having an engaging hole 6 to be fitted into the post 2 and a plurality of engaging holes 9 formed at the outer end of the foot plate 4, And a fixing foot 4a provided at the uppermost end of the foot plate 4 is fixed to a slab 10 of the corresponding floor or the like, (4a), and an engaging hole (9) for engaging the handrail (8) is formed on the fixed footrest (4a).

However, the height between the floor of the first floor and the floor of the second floor usually varies depending on the construction of the building and the like. Regarding this difference, with the prefabricated spiral step (1) of Patent Document 1, The spacer-bushing 5 must be prepared for the interlayer height, or the spacer-bushing 5 must be cut off or welded to the floor, which may result in inefficient construction or waste of materials.

On the other hand, in Patent Document 1, since the handrail 8, which is a stringer, is held by the U-shaped rod, the support of the fixed foot 4a is weaker than that supported by the side plate.

Since the fixed footrest 4a of the patent document 1 is fitted into the post 2, it is merely stacked and assembled so that the fixation footsteps can be shaken when the footrest is raised or lowered.

Supporting the pedestal by such a simple laminated fitting assembly and a rod can give the user an unstable element.

In order to solve such unstable factors, a prefabricated octagonal spiral step of Patent Document 2 is known.

The prefabricated octagonal spiral steps of the patent document 2 will be described with reference to Figs. 3 and 4, wherein the center column 16, the outsidestringer segment 10, the center column 16 and the outer side stringer segment 10 And a footrest 20 to be installed.

One side of the footrest 20 is assembled to the center pillar 16 and the other side of the footrest 20 is assembled to the side plate 11 of the outside stringer segment 10.

However, in Patent Document 2, it is almost impossible to carry out the construction unless the conditions of the construction site are sufficiently prepared.

That is, the center pillar 16 is composed of eight segments 17, 18, and 19, and each segment is formed by the number of notches to which the footrest 20 is assembled by the number of footrests.

Therefore, since the height of the interlayer between all the construction sites can not be matched with the center column 16 on which the notch is formed in advance, an assembly part corresponding to the condition must be made at each construction site.

As described above, Patent Documents 1 and 2 have very low general versatility, which can not be manufactured in advance in all construction sites, and their assembling workability is remarkably deteriorated.

Patent Document 1: Korean Patent Publication No. 10-2004-0101161 Patent Document 2: U.S. Patent No. 5,737,884

It is an object of the present invention to provide a prefabricated spiral staircase which improves the versatility applicable even if there is a change in the height between any of the construction sites, thereby significantly improving the assembling workability.

In order to achieve the above-mentioned object, the prefabricated spiral staircase according to claim 1 of the present invention comprises: a base fixed to a floor; A center pole having a lower end mounted on the base; A plurality of spacers interposed in the center pole; A foot having one side fitted to the center pole between the spacer and the spacer; An outer side stringer disposed on the other side of the foot plate; And an engaging member for engaging the other side of the foot plate with the out side stringer, wherein each of the spacers is constituted by a circular tube and a lower cap or an upper cap fitted on the lower side or the upper side of the circular tube.

In the assembled spiral step according to the second aspect of the present invention, a height adjusting disk is further interposed between the lower cap and the lower end of the cylindrical pipe, or between the upper cap and the upper end of the circular pipe.

In the assembled spiral step according to the third aspect of the present invention, the center pole is a male thread rod, and a nut is fastened to the center pole so that the lower cap presses one side of the foot plate.

In the assembled spiral step according to claim 4 of the present invention, at least a plurality of straight side plates are assembled to each other, and the outer side stringer has a rectangular shape in plan view.

In the assembled spiral step according to the fifth aspect of the present invention, the engaging member includes a bracket disposed in a groove formed by being cut out on the other side of the foot plate, and a first fixing hardware And a second fastening hardware for fixing the bracket to the inner surface of the straight side plate.

In the assembled spiral step according to the sixth aspect of the present invention, the bracket includes a bracket body having an outer side contacting the inner surface of the straight side plate and an inner side contacting the side surface of the stepping plate, And a second through hole supported through the first fixing hardware through the first through hole and between the upper surface and the outer surface of the bracket body or between the lower surface and the outer surface of the bracket body, .

The spacer assembly structure of the prefabricated spiral step according to claim 7 of the present invention comprises: a center pole fixed to a floor; A plurality of spacers interposed in the center pole; And a foot which is fitted to the center pole between the spacer and the spacer. The spacer is composed of a circular pipe and a lower or upper cap which is fitted on the lower side or the upper side of the circular pipe.

The present invention has the following effects.

The height of the spacer can be adjusted by inserting or removing the upper cap or the lower cap of the circular pipe, so that the assembly work can be easily performed even if the height of the interlayer at the construction site is different.

By interposing a disk between the upper cap and the circular tube or between the lower cap and the circular tube, not only the change width of the inter-layer height can be coped more quickly, but also the disk is internally interposed, useful.

The nut is fastened to the center pole of the male thread rod, so that the lower cap can press one side of the foot plate and firmly support each foot plate to stably use the step.

The outer side stringer has at least a plurality of straight side plates assembled to each other, and has a quadrangular outer side stringer in a plan view, so that it is more space efficient than an arc type outer side stringer. In other words, when the three sides are the wall, the corner portion of the quadrangle outside stringer is perpendicular, and the dead space can be eliminated.

Since the bracket is fixed to the foot plate while being disposed in the groove formed in the side surface of the foot plate and is fixed to the side plate, it is not necessary to process the groove for the separate support on the side plate, Cursors can create stable stairs.

Particularly, since the fixing to the side plate is made in the oblique direction, the support of the side plate is more firmly supported.

1 is a perspective view showing a conventional prefabricated spiral step.
FIG. 2 is an exploded perspective view of the essential portion of FIG. 1; FIG.
3 is a perspective view of another conventional prefabricated spiral step.
Figure 4 is a schematic plan view of Figure 3;
5 is a perspective view of a prefabricated spiral step according to a preferred embodiment of the present invention.
Fig. 6 is a plan view of Fig. 5; Fig.
Figs. 7 to 11 are perspective views showing the construction of the center pole on the base. Fig.
12 to 14 are perspective views for constructing the lowermost spacer.
15 is a sectional view taken along the line 15-15 in Fig.
Figures 16-20 are perspective views of assembling steps of the footrest and the first outer-side stringer segment.
FIG. 21 is an assembled cross-sectional view of a spacer according to a preferred embodiment of the present invention. FIG.
22 is an assembled sectional view of a foot plate and a side plate according to a preferred embodiment of the present invention;
23 and 24 are perspective views of a bracket according to a preferred embodiment of the present invention, as viewed from the outside and the inside;
25 is a perspective view showing a construction state of a stairway connected with a center pole;

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

5 and 25, a prefabricated spiral step 100 according to a preferred embodiment of the present invention includes a base 200 fixed to a floor FL, a center pole 300 installed on a lower side of the base 200, A plurality of spacers 400 to be inserted into the center pole 300 and a pedestal 500 to be inserted in the center pole 300 between the spacers 400 and the spacer 400, And outboard stringers 600a to 600d disposed outside the footboard 500 and an engaging member 900 coupling the outside of the footboard 500 and the outside stringers 600a to 600d.

8, the base 200 includes a first base 210 fixed to the floor FL, a second base 210 coupled to the first base 210 and supporting the lower side of the center pole 300, (260).

7, an insertion hole 211 into which the lower end of the center pole 300 is inserted is formed at the center of the first base 210. As shown in FIG.

A first through hole 213 is formed in the edge of the first base 210.

The first fastener 215 is hooked on the bottom of the first through hole 213 to press the first base 210 against the floor.

A plurality of first female screw holes 217 are formed in the vicinity of the insertion holes 211 of the first base 210.

The second base 260 for holding the lower side of the center pole 300 is fastened and fixed to the plurality of first female screw holes 217.

The second base 260 is cylindrical as shown in FIG. 8, and a second female screw hole 261 is formed at the center of the second base 260 to fasten the center pole 300.

The second female screw hole 261 is located at a position corresponding to the insertion hole 211.

The second base 260 has a plurality of second through holes 265 in which bolts, which are second fasteners 263 fastened to the plurality of first female thread holes 217, are formed.

Similarly to the first through hole 213, the second through hole 265 is engaged with the first fastener hole 217 while the second fastener 263 is fastened to the first base 210, .

15, the lower end 301 of the center pole 300 is inserted into the insertion hole 211 of the first base 210, and the lower end 301 of the center pole 300 is coupled to the second insertion hole 211 of the second base 260, (FL) until it catches down.

When the center pawl 300 is fastened to the second female screw hole 261, a loosening preventing nut 310 as shown in Fig. 10 is attached to the center pole 300 So that the upper surface of the second base 260 is pressed.

In particular, the anti-loose nuts 310 are preferably realized with a washer nut.

The height of the center pawl 300 can be adjusted according to the height of the interlayer by connecting the center pawls 300 together.

That is, as shown in FIG. 25, the center pawls 300 and the center pawls 300 may be fastened together with a nut 330 similar to a turn buckle.

Each of the spacers 400 is composed of a cylindrical tube 410, a lower cap 430 fitted to the lower side of the cylindrical tube 410, and a top cap 450 fitted on the upper side of the cylindrical tube 410.

The cylindrical tube 410 has a cylindrical shape, and the height of the cylindrical tube 410 may be slightly smaller than the height between the footplate 500 and the footplate 500. This is very useful when raising or lowering the construction site.

Each of the lower cap 430 and the upper cap 450 includes a horizontal plate 431 and a lower plate 451 covering the lower surface of the circular tube 410 and a plurality of flat plates 431 and 451 disposed on the outer surface of the circular tube 410, And vertical walls 433 and 453 protruding from the base. Of course, through-holes 435 and 455 are formed in the centers of the water level plates 431 and 451 to be fitted to the center pole 300.

Therefore, when the lower cap 430 is fitted into the circular tube 410, the height of the lower plate 430 is increased by the thickness of the horizontal plate 431 of the lower cap 430. When the lower cap 430 and the upper cap 450 are fitted in the circular tube 410 Its thickness is doubled.

Particularly, it is preferable that the spacer 400 further includes a height adjustment disk 440 (460).

That is to say, the height adjustment discs 440 and 460 are disposed between the lower cap 430 and the lower end 411 of the circular tube 410 or between the upper cap 414 and the upper cap 414 The intervals between the foot plate 500 and the foot plate 500 can be finely adjusted.

The discs 440 and 460 may be provided with a plurality of annular discs each having a small thickness and may be used in the required number of discs.

In this embodiment, the lower disk 440 and the upper disk 460 are implemented as two (441, 443, 461, and 463), respectively.

As described above, in this embodiment, the height of the spacer 400 can be variously and finely adjusted by assembling or separating not only the upper and lower caps 450 and 430 but also the disks 440 and 460, It can be easily assembled and assembled at a predetermined height height between the foot plates 500. In addition,

Accordingly, when the spacer 400 according to the present embodiment is prepared, it is possible to quickly and accurately perform construction without any labor such as the production or processing of parts for adjusting the height at any construction site.

At this time, since the lower cap 430a of the lowermost spacer 400a among the plurality of spacers 400 must be fitted to the outer peripheral surface of the second base 260 as shown in FIGS. 11 and 15, Unlike the through hole 435, a larger through hole 435a is formed.

Each part number of the lowermost or starting point spacer 400a is the same as that of the other spacer 400 with the lower case a attached thereto, and the function is the same.

It is also preferable that the disks 440 and 460 are supported in the upper and lower caps 450 and 430 while being fastened to the screws 445 and 465 as shown in FIG.

On the inner circumferential surface of the disks 440 and 460 are formed receiving grooves 447 and 467 for receiving part of the screws 445 and 465 as shown in FIGS. 12 and 15, and upper and lower caps 450 and 430 It is preferable that the female threads 446 and 466 are formed corresponding to the receiving grooves 447 and 467.

The screws 445 and 465 may be prepared with short or long screws depending on the height of the disks 440 and 460. This is to prevent the upper and lower horizontal plates 431 and 451 from being pierced when the screws 445 and 465 are fastened to the female screws 446 and 466.

When the first spacer 400a is installed as shown in FIG. 17, one side of the first footplate 500 is put on the upper surface of the upper cap 450a by fitting the center pole 300 and then the second spacer 400 is the same as the first The lower cover 430 is inserted into the center pawl 300 and then the lower cover 430 is pressed while the press nuts 700 are fastened to the center pawl 300. Then, the lower cover 430 presses one side of the foot plate 500 and stably supports it.

As described above, each time the spacer 400 is assembled, the pressing nut 700 is fastened by the number of the spacers, so that each foot plate 500 is firmly supported without shaking.

Projections 437 and 457 are formed on the center of the upper surface of the lower cap 430 and the lower center of the upper cap 450.

The protrusions 437 and 457 function not only as a seat on which the pressing nut 700 can be placed but also more significantly than the thickness of the horizontal plate 431 But also functions as a reinforcing member which is thick so that even if the pressing nut 700 is very tight, it is not damaged.

For reference, only the through hole 435a is provided in the horizontal plate 431a of the lower cap 430a of the lowermost spacer 400a.

As shown in Figs. 16 to 20, the foot plate 500 is a plate close to a fan shape (since the foot plate is placed in a spiral form), and a through hole (not shown) 510 are formed on the other side (outer side), and a groove 510 cut out in a U shape is formed on the other side (outer side).

As shown in FIG. 19, grooves 530 and 550, which are cut out in the shape of a letter and fit to the large-diameter moving parts 630a and 650a, are formed on the other side (outer side) of the foot plate 500 according to the position of the foot plate 500 .

A through hole 510 is formed in the center of the upper cap 450 and the center of the lower cap 430 so as not to wobble when the through hole 510 of the foot plate 500 is placed between the lower side cap 450 and the upper side lower cap 430, It is preferable that the projections 439 and 459 are formed.

The groove 510 is composed of grooves of which upper and lower sides are open.

The groove 510 is provided with a bracket 910 described later.

Outside stringers 600a to 600d have a quadrangular shape as seen in plan view as shown in Figs. 5 and 6, and a first outside stringer segment 600a, a first outside stringer segment 600a, A third outsided stringer segment 600c connected to the second outsided stringer segment 600b and a third outsided stringer segment 600c connected to the third outsided stringer segment 600c, 4 outside stringer segment 600d.

The first outer stringer segment 600a is assembled to the upper and lower ends of the first linear side plate 610a and the first linear handrail 620a and the first linear side plate 610a and the upper and lower ends of the first linear handrail 620a A first sled 650a interposed between the upper surfaces of the first upper moving part 630a, the first lower moving part 640a and the first linear side plate 610a and the lower surface of the first linear handrail 620a .

The second outboard stringer segment 600b is assembled at right angles to the first outboard stringer segment 600a and includes a second straight side plate 610b whose lower end is assembled to the first upper lever 630a, A second major axis 630b assembled to the upper end of the second linear straight side plate 610b and the upper end of the second linear handrail 620b and an upper surface of the second straight side plate 610b, And a second throttle 650b interposed between the lower surface of the handrail 620b.

The third outer side stringer segment 600c is assembled at right angles to the second out side stringer segment 600b and includes a third linear side plate 610c whose lower end is assembled to the second outer minor 630b, A third major axis 630c assembled to the upper end of the third straight line side plate 610c and the upper end of the third straight line handrail 620c and a third major axis 630c assembled to the upper end of the third straight line side plate 610c, And a third minor 650c interposed between the lower surface of the rail 620c.

The fourth outboard stringer segment 600d as the final point is assembled at right angles to the third outboard stringer segment 600c and includes a fourth straight side plate 610d whose lower end is assembled to the third outer barrel 630c, The upper side of the fourth straight line handrail 620d and the fourth straight line side plate 610d and the fourth major axis 630d and the fourth straight line side plate 610d assembled to the upper end of the fourth straight handrail 620d, And a fourth phantom 650d interposed between the lower surface of the four-line handrail 620d.

A fourth 'side stringer segment 600d' is provided opposite the fourth outside stringer segment 600d.

The fourth 'inside stringer segment 600d' includes a fourth 'parent' 630d 'corresponding to the fourth parent 630d and a fourth' parent '630d' secured to the top of the center pole 300 A fourth 'handrail 620d' assembled between the fourth and fifth movable members 630d 'and 630d' ', and a fourth' handrail 620d 'assembled between the fourth movable member 630d' and the fourth movable member 630d ' And a fourth 'throttle 650d' interposed between the lower surface of the 4 'handrail 620d'.

It is preferred that at least the first upper minor 630a, the first lower minor 640a and the second minor 630b are placed on the floor and serve as pillars.

The fourth and sixth movable elements 630d and 630d 'are fixed to the wall of the two-layer slab.

Each of the first to fourth straight side plates 610a to 610d and the first to fourth straight hand rails 620a to 620d is formed of an inclined straight plate inclined from the lower end toward the upper end.

The first to fourth straight side plates 610a to 610d are plate-shaped in height higher than the thicknesses of the outer surface 1a and the inner surface 1b. The first to fourth straight hand rails 620a to 620d To the fourth straight side plates 610a to 610d.

Further, in order to eliminate the step between each of the outer stringer segments 600a to 600d, it is preferable to process the upper end side and the lower end side of the oblique rectilinear plates 610a to 610d horizontally or almost horizontally.

20, the first straight side plate 610a is composed of an inclined straight plate 611a and upper and lower horizontal plates 613a and 615a formed above and below the inclined straight plate 611a.

Likewise, the first linear handrail 620a also includes a slant rectilinear plate 621a and upper and lower horizontal plates 623a and 625a in the same shape as the first linear side plate 610a.

Therefore, the remaining second to fourth straight side plates 610b to 610d are also composed of an inclined straight plate and upper and lower horizontal plates formed above and below the inclined straight plate.

The second to fourth linear hand rails 620b to 620d are also formed of the inclined straight plate and the upper and lower horizontal plates so as to have the same shape as the second to fourth straight side plates 610b to 610d.

The upper and lower water level plates prevent the water level plate from being stepped up and down when assembled between the segments, so that they seem to be connected to one another in appearance.

Needless to say, the handrail may be formed into a bar shape instead of a plate, but it is convenient to make a plate shape because it is troublesome to attach a separate bar to prevent a step difference.

22, the engaging member 900 includes a bracket 910 disposed in the groove 510 of the foot plate 500 and a first fixing hardware member 910 for fixing the bracket 910 to the foot plate 500 And a second fixed metal piece 950 for fixing the bracket 910 to the inner surface of the straight side plate 610 by fixing it.

23 and 24, the bracket 910 includes a bracket body 911 and a first through hole 913 that penetrates between the outer side surface 911a and the inner side surface 911b of the bracket body 911. [ A second through hole 915 or 917 passing through between the upper surface 911c and the outer surface 911a of the bracket body 911 or between the lower surface 911d and the outer surface 911a of the bracket body 911, .

The first through hole 913 is a horizontal through hole passing through two spaced apart inner and outer surfaces 911b and 911a.

Hereinafter, the second through hole 915 or 917 will be described as the second through hole 915 and the second through hole 917 according to the present embodiment.

That is, the 2a through hole 915 is a hole penetrating between two adjacent surfaces of the bracket body 911, that is, between the upper surface 911c and the outer surface 911a.

The second through bore 917 is a hole penetrating between two adjacent surfaces of the bracket body 911, that is, between the lower surface 911d and the outer surface 911a.

Similarly, the second fixed hardware 950 is also divided into the 2a fixed hardware 950a and the 2b fixed hardware 950b.

The bracket main body 911 may be formed as a hexahedron having front and rear parts 911e and 911f, inside and outside parts 911b and 911a and upper and lower parts 911c and 911d.

When the bracket body 911 is a hexahedron, the 2a through hole 915 is a 2a inclined through hole 915 having a + slope from the upper side (upper side) to the lower side (outer side) Is a second b-gradient through-hole 917 having a slope that is directed from the bottom (bottom) to the stomach (outer side).

The first through holes 913 are arranged in the front-rear direction (three in this embodiment). The number of the first through holes 9130 is determined according to the specification of the step.

The first fixing hardware 930 is inserted into the first through hole 913 and is fixed in the side surface of the stepping plate 500 so that the first fixing hardware 930 can move the bracket body 911 to the stepping plate 500, .

The second 2a inclined through hole 915 is disposed between the first through holes 913 and the second through hole 917 is disposed directly below the first through hole 913. [

The second 2a fixing hardware 950a and the second b fixing hardware 950b such as nails and screws are inserted into the 2a first inclined through hole 915 and the second 2b inclined through hole 917 so as to be inserted into the inner surface 1b of the side plate 610 So that the 2a fixed metal piece 950a and the 2b fixed metal piece 950b serve to support the bracket body 911 to the side plate 610. [

Particularly, since the 2a fastening hardware 950a and the 2b fastening hardware 950b are fixed in the oblique direction, they have greater resistance to load or torsion than those fixed in the horizontal direction, thereby further securing safety.

The inside of the first through hole 913, the second inclined through hole 915 and the second inclined through hole 917 is formed with a locking protrusion for receiving a head such as a nail or a screw.

On the other hand, a flange 960 may be further formed on the front, back, and inner circumferences of the lower surface 911d of the bracket body 911. [

The flange 960 supports the bottom surface of the groove 510 of the foot plate 500, so that it can withstand a heavier load.

Particularly, when the flange 960 is disposed in the stepped groove 515 formed around the groove 510, the flange 960 is on the same plane as the bottom surface of the footplate 500 and is apparently good.

Further, a downward extending piece 970 extending downward may be further formed on the outside of the lower surface 911d of the bracket body 911. [

The lower extension 970 is further formed with a third through hole 981 through which a third fixing hardware 980 such as a nail or a screw is fastened.

The third through hole 981 is formed with a latching protrusion for catching the head of the third fixing hardware 980.

The downward extending piece 970 is tightly fixed to the inner surface 1b of the side plate 610 through the third through hole 981 and can withstand a very large load.

A finish plate (not shown) having the same color as that of the foot plate 500 may be attached to the upper and lower surfaces 911c and 911d of the bracket 910 by adhesion, magnetism or a screw.

When fixing the finishing plate with the screw, it is preferable that a female screw is formed on the front and rear sides of the upper surface 911c of the bracket 910 and the flange 960.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be apparent to those skilled in the art.

For example, in the description of the present embodiment, the outsider stringer is described as a light consisting of a side plate, a handrail, a large mirror, and a minor, but it is clear that the narrowed outside stringer can be composed of only the side plate to form a spiral step, This also applies to this embodiment.

100: prefabricated spiral steps 210, 260: first and second bases
300: center pole 400: spacer
410: circular tube 450,430: upper and lower cap
440,460: Disk 500: Scaffold
600a to 600d: Outside stringer 610a to 610: Straight side plate
620a to 620d: straight hand rails 630a to 630d:
650a to 650d: fender 700: (pressurized) nut
900: coupling member 910: bracket
911: Bracket body 913: First through hole
915,917: 2nd (inclined) through hole 930: 1st fixing hardware
950: second fixing hardware 960: flange
970: Downward extension 980: Third fixed hardware
984: Third (inclined) through hole

Claims (7)

delete A base fixed to the floor;
A center pole having a lower end mounted on the base;
A plurality of spacers interposed in the center pole;
A foot having one side fitted to the center pole between the spacer and the spacer;
An outer side stringer disposed on the other side of the foot plate;
And an engaging member for engaging the other side of the footrest with the outside stringer,
Wherein each of the spacers comprises a cylindrical tube and a lower or upper cap which is fitted on the lower side or upper side of the cylindrical tube,
Wherein a height adjusting disc is further interposed between the lower cap and the lower end of the cylindrical tube or between the upper cap and the upper end of the cylindrical tube.
The method of claim 2,
The center pole is a male thread rod,
And a nut is fastened to the center pawl so that the lower cap presses one side of the foot plate.
The method according to claim 2 or 3,
The outer stringer includes at least a plurality of linear side plates assembled with each other,
A prefabricated spiral staircase that forms a square when viewed in plan.
The method of claim 4,
The bracket is fixed to the inner surface of the straight side plate. The bracket is fixed to the inner surface of the straight side plate, and the bracket is fixed to the inner surface of the straight side plate. A prefabricated spiral staircase made of a second fixed hardware.
The method of claim 5,
The bracket includes a bracket body having an outer side contacting an inner surface of the straight side plate and an inner side contacting an inner side of the bracket body and a bracket body passing through between the inner side surface and the outer side surface of the bracket body, And a second through hole supported between the upper and lower surfaces of the bracket body or between the lower surface and the outer surface of the bracket body and supported by the second fastening hardware.
A center pole fixed relative to the floor;
A plurality of spacers interposed in the center pole;
And a scaffold in which one side is fitted to the center pole between the spacer and the spacer,
Wherein the spacer comprises a cylindrical tube and a lower or upper cap which is fitted to the lower or upper side of the cylindrical tube,
Wherein a height adjusting disk is further interposed between the lower cap and the lower end of the cylindrical tube or between the upper cap and the upper end of the circular tube.

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