JP2001173184A - Prefabricated frame structure of spiral stair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent possibility that the weak side of tensile strength is generated in a pace board in the case of the use of a board made of glued laminated wood, tensile force works on the pace board when tilting force works to a support and a crack is generated in the pace board though the board made of glued laminated wood is often used because the pace board has a wide area in spiral stairs installed into a building. SOLUTION: In the spiral stairs in which a plurality of treads 3, 3... are arranged spirally to a support 1 and the pace board 4 is installed to the upper section of the support 1, tilting force can be supported by a connecting material 5 (the supporting has not an adverse effect on the pace board 4) even when tilting force works to the support 1 by using a board material made of wood as the pace board 4 while connecting a support upper end section 1a and a building foundation material 11 by the connecting material 5 having large tensile strength on the underside side of the pace board 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral staircase installed mainly in a house, and more particularly, to a spiral staircase in which a predetermined number of step boards and a landing board are sequentially and spirally attached to the outer periphery of a single column. It is about structure.

[0002]

2. Description of the Related Art When a spiral staircase is installed in a house, the spiral staircase functions as an interior in addition to the original (staircase) function. It is gradually spreading.

FIGS. 1 to 4 show a conventional spiral staircase to which the present invention is applied. The conventional spiral staircase shown in FIGS. 1 to 4 has a plurality of (twelve in the illustrated example) step plates 3, 3 on the outer periphery of a column 1 erected and fixed on a floor 10 via spacers 2. ..Each base end 3a
And the base end (corner) 4a of one landing plate 4 were mounted, and each of the step plates 3, 3,... And the landing plate 4 were displaced by a predetermined angle (for example, an angle of 30 °) in plan view. In this state, the outer ends 3b, 4b of the step boards 3 and the landing board 4 and the spiral handrail member 6 are connected by fences 7, 7,. In addition, on one side of the upper surface of the landing plate 4,
A fence body including a cap 42, an upper handrail 46 and a fence material 47 is provided. In addition, a pillar 1 is provided at the center of each spacer 2, the base end 3a of each step board 3, and the base end 4a of the landing board 4, respectively.
A hole is formed for fitting to the outer periphery of.

[0004] Since the pillar 1 needs high strength,
For example, a steel pipe having an outer diameter of about 90 mm is used. In addition, each member other than the column 1 in the spiral staircase (in FIG. 1, the spacer 2, the step plate 3, the landing plate 4, the handrail member 6, the fence member 7, the column member 8, the capping 42, the upper handrail 46, and the fence member 47 Etc.) are all made of wood to function as a luxury interior.

[0005] Since the depth of the step board 3 may be relatively small, one wooden board can be used. In this case, the step board 3 is cut out such that the grain faces the longitudinal direction of the step board 3 (lateral width direction) in terms of maintaining strength when a person rides on the board.

The landing board 4 has a large area (for example, 1 m × 1 m).
Can not use a single wooden board,
Generally, as shown in FIG. 1 to FIG. 4, a plate made of glued laminated wood in which a large number of small pieces of wood are adhered with an adhesive is often used. By the way, in such a board made of laminated wood, the tensile strength is strong in the longitudinal direction of the wood piece (the AB direction in FIG. 2), but in the width direction of the wood piece (the CD direction in FIG. 2). It has the property of low tensile strength.

The spiral staircase shown in FIGS. 1 to 4 is assembled as follows. The illustrated example shows the case of a spiral staircase having a left-turning upward structure. First, the two side portions of the landing board 4 are placed on the second floor portion of a building base material (for example, a wall surface of a corner portion of a room as shown in FIG. 2) 11 where the spiral staircase is installed. Each receiving bar 12, 12 is attached. Next, the column 1 is erected at a predetermined position on the floor 10.
In this case, the column 1 is attached to the floor 1
It is fixed simply by screwing it to 0. Next, a total of twelve sets each including one spacer 2 and one step board 3 are sequentially fitted on the outer periphery of the support 1 from the support upper end 1a. In this case, since the support 1 has its lower end simply fixed to the floor surface 10 with a screw, the strength against the overturning action is weak. Therefore, as shown in FIG. Arrange them alternately at opposing positions to balance them. Next, one spacer 2 and landing plate 4 are fitted thereon (on the uppermost step plate 3). In this case, the hole 4e formed in the base end (corner) 4a of the landing board 4 is
And the two side portions (reference numerals 4c and 4d) of the landing board 4 are respectively fitted to the receiving bars 12, 12
Put on top. Each side 4c, 4d of the landing board 4 is fixed to the receiving bars 12, 12 with an adhesive. In the case of the left turning up structure of the illustrated example, the direction of the handle of the rising opening of the landing plate 4 (the direction in the longitudinal direction of the small piece of laminated wood) is oriented in the AB direction in FIG. After that, based on the landing board 4, each board 3, 3, ...
Are sequentially shifted from the upper side by a predetermined angle (for example, an angle of 30 °), and are connected to each other (at the same height as the spacer 2).
Connect at 7a. The grain of the uppermost step board 3 is close to the grain of the landing board 4 (grain of laminated wood) (angle 15).
(In a state shifted by about °). Next, the outer end portion 3b of each of the step boards 3, 3,.
Are erected at the outer ends 4b of the fences, and a spiral handrail member 6 is connected to the tip of each of the fences 7, 7,. Then, the assembling of the spiral staircase is completed by assembling the coping 42, the pillar 8, the upper handrail 46, the fence 47 and the like on the upper surface of the landing board 4.

[0008]

The above-mentioned conventional spiral staircase has the following problems. (1) During the assembling shown in FIG. 4, since the lower end of the column 1 is merely fixed to the floor 10 within a small area range (the flange 1 b portion), the column 1 is composed of the column 1, each spacer 2, and each step board 3. The posture of the standing structure Y is unstable. And
A landing plate 4 is provided at the upper end 1a of the column of the unstable standing structure Y.
For example, when the side portion of the landing plate 4 collides with the vicinity of the upper portion of the upright structure Y from the side, an action such that the upright structure Y is overturned works (the lower end portion of the column). This may cause the floor 10 to be damaged. (2) When attaching the landing board 4 to the support upper end 1a, carry the landing board 4 and climb up to the vicinity of the upper end of the stepladder, where the hole 4e of the landing board 4 is fitted to the support upper end 1a. However, if the column 1 is rough, the fitting operation becomes difficult. (3) The landing board 4 generally uses a board made of glued wood. The glued wood has a high tensile strength in the longitudinal direction (A-B direction in FIG. 2) of the wood piece, but the width of the wood piece is large. Direction (Fig. 2
(CD direction) has a property of low tensile strength. On the other hand, in the assembled spiral staircase, when a person gets on the step board 3, a load is applied on the step board 3 (for example, an arrow W in FIG. 3).
Is added, and the column 1 is tilted in the direction in which the load is applied (for example, the direction C in FIG. 3). When the column tilting force is applied in a direction (C direction) where the tensile strength of the landing board (made of laminated wood) 4 is weak, the wood pieces of the landing board 4 are separated from each other, and the landing board 4 is used for a long time. There was a possibility that cracks would occur on the landing board 4 if it was. In addition, in the spiral staircase of the illustrated example, a coping 42, an upper handrail 46, and the like are attached to the upper surface of the landing board 4, but these members have almost no deterrent to the pulling force in the C direction against the landing board 4. .

The present invention has been made in view of the above-described problems of the conventional spiral staircase, and has been made to facilitate the work of assembling a landing board, and to produce a pulling action in a direction of low tensile strength with respect to the landing board. It is an object of the present invention to provide a spiral staircase assembling structure.

[0010]

The present invention has the following structure as means for solving the above-mentioned problems. The invention of claim 1 of the present application The invention of claim 1 of the present application is directed to a spiral staircase in which a plurality of step plates are spirally arranged on a support, and a landing plate is attached to an upper portion of the support.

A spacer having a predetermined height is interposed between the step plates. Each spacer, each step board, and a landing board are fitted to the outer periphery of the column in order from the column upper end. In addition, each step board and a landing board are attached to the outer periphery of a support | pillar by inserting the hole formed in the base end from the support | pillar upper end part, respectively. A spiral handrail member is attached to each outer end of each step board and landing board via a fence material.

[0012] A steel pipe is used for the pillar because it requires high strength. However, a spacer, a step board and a landing board are fitted around the pillar, so that the pillar is externally mounted. Is no longer visible.

The landing board uses a wood board to give a sense of quality. This type of landing board is, for example, 1m
Because it has a large area of about 1m, a single wooden board cannot be used, and this type of landing board is made of glulam laminated with a large number of small pieces of wood glued together with an adhesive. Often a board is used. By the way, a laminated wood plate has a property that the tensile strength is strong in the longitudinal direction of the small piece of wood, but is low in the width direction of the small piece of wood.

[0014] In the spiral staircase of the present invention, the upper end of the pillar and the building base material are connected to each other on the lower surface side of the landing board by a connecting material having high tensile strength. This connecting member is made of a material having high tensile strength, such as metal or reinforced plastic. As a building base material to which one end of the connecting member is fixed, a high strength portion of a building wall surface (for example, a column, a beam, a girder, etc.) at a position where a spiral staircase is installed is preferable. Further, in the first aspect, the connecting member may be a single long material capable of connecting between the upper end portion of the column and the building base material.

[0015] In the assembly structure of the spiral staircase of the first aspect,
The landing board is installed by alternately fitting spacers and step boards to the support, and then straddling the upper end of the support and the base material of the building. A connecting member is interposed between the upper end portion and the building base material. Therefore, at the time of the operation of attaching the landing board, the support is supported in a stable posture by the connecting member, and the support does not become rough when the base end (hole) of the landing board is fitted to the upper end of the support. When the landing board is to be fitted from the upper end of the support, the player carries the landing board and climbs up to the upper part of the stepladder, and performs work there, but fits the base end (hole) of the landing board to the upper end of the support. If you do not make the struts stick beforehand, the work of aligning the hole of the landing board with the upper end of the strut will be easy, and the struts that fix the lower end of the strut will be easier because the struts do not stick. Does not damage.

In the assembled state of the spiral stairs, the upper end of the column and the base material of the building (high strength) are connected by a connecting member having high tensile strength. Even if such a function works, the tilting power can be supported by the connecting member, and no adverse effect (pulling action) occurs on the landing board. According to a second aspect of the present invention, in the assembly structure of the spiral staircase according to the first aspect, the connecting member includes a base-side split piece provided with an attaching portion that can be attached to a building base material at one end; And a front-side split piece provided with a ring portion that can be fitted from above into the upper end of the support column.

The other end of the base divided piece and the other end of the front divided piece are formed with an engagement receiving portion and an engagement portion which are respectively engaged and connected with each other.

Further, in the connecting member used in the second aspect, the mounting portion of the base side split piece is fixed to the base material of the building and the column of the front side split piece is erected at a predetermined position. The portion and the engaging portion can be engaged with the upper end portion of the column and the engagement receiving portion of the base split piece from above, respectively.

As described above, when the connecting member is divided into two parts, the base divided piece and the front divided piece, the base divided piece can be fixed to a predetermined position of the building base material in advance. Then, the front split piece is lowered from above, and the ring portion on one end is fitted to the upper end portion of the support, while the engaging portion on the other end is engaged with the engagement receiving portion of the base split piece. Is fine. That is, in a structure in which the upper end of the pillar is connected to the base material of the building with a connecting material, as in the case of using a single real connecting material, one end is locked to the upper end of the pillar and the other end is connected to the building. It is not necessary to fix to the base material of the building, and the connecting work between the upper end of the column and the building base material by the connecting material becomes easy.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An assembly structure of a spiral staircase according to an embodiment of the present invention shown in FIGS. Note that the spiral staircase of this embodiment has the same shape as the spiral staircase shown in FIGS. 1 and 2 in an assembled state, and the spiral staircase shown in FIGS.
2 and FIG.

Each member used in the spiral staircase of the embodiment of the present invention is as follows. That is, as shown in FIGS. 1 and 2 and FIGS. 5 to 8, one support column 1 erected and fixed on the floor surface 10, a total of twelve step boards 3, 3. A total of thirteen spacers 2, 2,... For providing a step between the landing plate 4 and the floor 10 and the step board 3, or between the step boards 3 and 3, and between the step board 3 and the landing board 4, respectively. And a total of 12 washers 15 for reinforcing the base end 3a of each step board 3
(FIG. 5), one spiral handrail member 6, the outer end 3b of each step board 3 (or the outer end 4b of the landing plate 4) and the handrail member 6
, The outer ends 3b of the upper and lower step boards 3, 3 and the outer ends 3b of the step board and the outer ends 4b of the landing boards are connected. .. Connecting members 7a, 7a,..., A column member 8, an upper fence member 42, an upper handrail 46, a fence member 47, etc.
And a screw member 9 screwed to the upper part of the upper end of the support 1
And a connecting member 5 for connecting a building base material (for example, a wall surface) 11 to the base material.

Among the members used in the embodiment of the present invention, the support 1, the spacer 2, the step board 3, the landing board 4, the handrail member 6, the fence 7, the column 8, the coping 42, the upper handrail 46, The fence member 47 has basically the same structure as that of the conventional example shown in FIGS. 1 to 4 except for a part, and the description of the above-described conventional example is cited except for the differences described below.

A female screw is formed on the inner surface of the upper end 1a of the column 1. Further, a flange 1b having a screw hole is formed at a lower end portion of the support column 1.

As shown in FIG. 5, the screw member 9 is formed by forming a flange 91 at the upper end of a threaded tube portion having an external thread. The male screw of the screw member 9 is screwed with the female screw of the upper end portion 1a of the column. Flange 9
1 is a hole 4e formed in the base end (corner) 4a of the landing plate 4
Has an outer diameter larger than the inner diameter of For example, landing board 4
The inner diameter of the hole 4e is about 90 mm, while the outer diameter of the flange 91 of the screw member 9 is about 140 mm.
Further, locking holes (four in total) are formed in the flange 91 to receive the projections of the tightening hacker.

The washer 15 is used to reinforce the rim of the hole formed in the base end 3a of the step board 3, and has a thickness of about 3 mm. The hole of the washer 15 is slightly larger (for example, 91 mm) than the outer diameter of the column 1.

The spacer 2, the step board 3, and the landing board 4
Those described in the conventional examples are used. still,
The spacer 2, the step board 3, and the landing board 4 are each made of wood. In addition, the step board 3 is cut out such that its grain faces the longitudinal direction of the step board (lateral width direction). As the landing board 4, a board made of glued laminated wood in which a number of small pieces of wood are adhered with an adhesive is used. Therefore, in this landing board 4,
There is a property that the tensile strength is low in the width direction of the small wood piece (the CD direction in FIGS. 5 and 6).

On the lower surface of each spacer 2, there is formed a counterbore for fitting the washer 15 (or the flange 1b at the lower end of the column). In addition, a concave portion 2 a into which a part of the front divided piece 56 of the connecting member 5 is fitted is formed on the upper surface of the uppermost spacer 2. The ring portion 57 of the front split piece 56 of the connecting member 5 described below is also fitted into the concave portion 2a.

As shown in FIG. 7 and FIG. 8, a connecting member 5 for connecting the upper end portion 1a of the column and the building base material 11 is a base split piece 51 attached to the building base material 11 side.
And a front split piece 56 fitted to the upper end 1a of the support. The base side split piece 51 and the front side split piece 56
Are made of steel in this embodiment.
The divided pieces 51 and 56 can be made of an appropriate material (for example, reinforced plastic) as long as it has a high tensile strength.

The base side split piece 51 has an elongated plate portion having a length of, for example, about 20 cm, and has an attachment portion 52 fixed to one end of the building base material 11 at one end, and an engagement receiving portion at the other end. 53 are formed. The mounting portion 52 is bent downward, and a hole for inserting the bolt 55 is formed in the bent portion. The engagement receiving portion 53 has a hook-shaped convex portion 53a and a hook-shaped concave portion 53b as shown in FIGS. A receiving shelf 54 is attached to the bottom of the hook-shaped recess 53b.

The front split piece 56 has an elongated plate portion having a length of, for example, about 80 cm, and has a ring portion 57 at one end thereof which can be fitted to the upper end portion 1a of the support, and an engaging portion at the other end. 58 are formed. The inner diameter of the ring portion 57 is formed to be substantially the same as the outer diameter of the column upper end portion 1a and slightly larger (for example, the inner diameter of the ring portion 57 is 91 mm). The ring portion 57 can be fitted to the outer periphery of the column upper end 1a from above. The engaging portion 58 is formed in a shape that can be unevenly engaged with the engagement receiving portion 53 on the base side split piece 51 side with almost no play. That is, the hook portion 5 on the side of the engagement receiving portion 53 is
3b, and a hook-shaped concave portion 58b for engaging the hook-shaped convex portion 53a on the engagement receiving portion 53 side. The engaging portion 58 of the front split piece 56 can be engaged with the engagement receiving portion 53 of the base split piece 51 from above. In this engaged state, as shown in FIG. 7, the hook-shaped protrusions 53a, 58a on each side are fitted into the hook-shaped recesses 53b, 58b on the other side, and the hook-shaped protrusions 58a on the front split piece 56 side. Is the hook-shaped recess 5 of the base divided piece 51
The base split piece 51 and the front split piece 56 are placed on the receiving shelf 54 in 3b without any step. In addition, as shown in FIG.
1 and the front-side split piece 56 are firmly connected in the pulling direction, and cannot be bent left and right.

The spiral staircase of the embodiment of the present invention is assembled as follows. First, the base divided piece 51 of the connecting member 5 is fixed to a predetermined position of the building base material 11 with a bolt 55. That is, the base side split piece 51 is horizontally mounted at a height where the lower surface of the landing plate 4 is located and at a position corresponding to the planned standing position of the column 1 in a posture facing the column 1.
The connecting member 5 reinforces the side of the landing board (made of laminated wood) 4 having a low tensile strength (the CD direction which is the width direction of the small piece of wood), and the direction of the landing board 4 (clockwise rotation). (Depending on whether it is turning up or turning left). After attaching the base division piece 51, the receiving bars 12, 12 of the landing board 4 are attached to the building base materials (two surfaces) 11, 11.

On the other hand, as shown in FIG. 5 or FIG. 6, the support column 1 is fixed upright on the floor surface 10 by fastening the lower end flange 1b to the floor surface 10 with screws. In addition, pillar 1
Until the upper end portion 1a is connected with the connecting member 5, the upper end portion is erected only by screwing the lower end portion flange 1b.

Next, one spacer 2, one step plate 3, and one washer 15 are arranged on the outer periphery of the column 1 from the column upper end 1 a.
After fitting as a set, screws (total of 6 screws) are
5 is screwed into the upper surface of the spacer 2 through the screw hole of the step board 3 and the screw hole of the step board 3, so that the washer 15, the step board 3 and the spacer 2
And are integrated. The work near the upper end 1a of the support column is performed by a worker climbing a stepladder. Similarly, a total of 12 pairs (12
The stepped plates 3) are sequentially fitted from the column upper end 1a, and are integrated with a set of washers 15, the stepped plate 3, and the spacer 2 with screws. Thereafter, the last spacer 2 (the spacer 2 having the concave portion 2a on the upper surface) is fitted to the outer periphery of the support 1 near the upper portion. In this state, as shown in FIG. 8, the upper end portion 1a of the column is exposed from the upper surface of the uppermost spacer 2 to a degree slightly shorter than the thickness of the landing plate 4. At this stage, the step boards 3, 3,... Are oriented in opposite directions to each other as shown in FIG.

Next, the front divided piece 56 of the connecting member 5 is carried above the upper end 1a of the column, and the ring portion 57 is fitted to the upper end 1a of the column from above. The joint portion 58 is engaged from above with the engagement receiving portion 53 of the base side split piece 51 previously fixed. As described above, both ends (the ring portion 57 and the engaging portion 5)
8) can be interposed between the upper end portion 1a of the column and the base division piece 51 by dropping from above, respectively, so that the work of attaching the front division piece 56 becomes easy. Moreover, in the case where the connecting member 5 is one, the other end of the connecting member is fixed to the building base material 11 in an unnatural posture on a stepladder having a poor scaffold while one end of the connecting member is connected to the column upper end portion 1a ( However, in the present embodiment, the bolting operation can be performed by a simple operation using only the base side split piece 51.

In this state, as shown in FIG. 7, the base side split piece 51 and the front side split piece 56 continue in a straight line in an engaged state, and the upper end 1a of the support is connected via a series of connecting members 5. And is supported on the building base material 11 side. Therefore, since the support | pillar 1 is fixed at upper and lower two places, the upright attitude | position is stabilized.

Next, an adhesive is applied to the upper surfaces of the receiving bars 12, 12, and then the landing plate 4 is carried on a stepladder while the landing plate 4 is in a horizontal position. (Fig. 5)
Is fitted to the column upper end 1a. Thus, landing board 4
When fitting the hole 4e into the upper end portion 1a of the column, the column 1 is erected in a stable posture by the connecting member 5, so if the landing plate 4 pushes the upper part of the standing structure Y (FIG. 4), Also support 1
There is no grind. Accordingly, the lower end portion of the column (flange 1b) does not work to knead the floor surface 10, so that the floor surface 10 is not damaged. In addition, when the column 1 is standing in a stable posture, the operation of aligning the hole 4e of the landing plate 4 with the column upper end 1a and the operation of fitting the column 4e become easier. At this time, the lower surfaces of the two sides of the landing plate 4 are fixed by contacting the adhesive on the upper surfaces of the receiving bars 12, 12.
After that, the receiving bar 12 and the landing plate 4 may be screwed.

Next, the screw member 9 is loosely screwed into the female screw at the upper end portion 1a of the column (a tightening hacker is used if necessary). In this state, since the flange 91 of the screw member 9 is located above the landing plate 4 and the flange 91 is larger than the hole 4 e of the landing plate 4, the landing plate 4 does not fall off from the upper end of the column 1. In this state, each of the step plates 3, 3,... Is horizontally rotatable around the outer periphery of the column 1.

Next, in the same manner as in the conventional example, the connecting members 7 are shifted from the upper side by a predetermined angle (for example, an angle of 30 °) in order from the landing board 4 in order from the upper side.
a (FIG. 1), the outer ends 3 of the step boards 3, 3,.
b and fence members 7, 7, ... at the outer end 4b of the landing board 4, respectively.
, And a spiral handrail member 6 is connected to the tip of each of the fences 7, 7,.

Then, in this state, the screw member 9 is strongly tightened using a tightening hacker. Then, the upper surface of the landing plate 4 is pushed down by the lower surface of the flange 91 of the screw member 9,
Between the lower surface of the flange 91 and the floor 10, the spacers 2, 2,..., The step boards 3, 3, and the landing plate 4 are firmly tightened. After that, the flange 91 of the screw member 9
Is fixed to the edge of the hole 4e of the landing plate 4 with screws (total of four screws) (the screw member 9 is not loosened).

Next, a cap 42 is adhered to one side of the base end side of the landing plate 4 with an adhesive, and the lower protruding bar of the column member 8 is attached to the hole at the base end of the cap and the screw member 9 via the adhesive. When the fence 47 is inserted into the hole, the fence 47 is erected on the coping 42, and the upper handrail 46 is attached to the top of the fence 47, the assembly of the spiral staircase is completed. In this state, the connecting member 5 is exposed on the lower surface of the landing plate 4, but the connecting member 5 can be covered with a decorative cover, for example, as shown by a dashed line in FIG. 6 (reference numeral 59). .

In the assembled state of this spiral staircase, for example, FIG.
As shown in FIG. 2 and FIG. 2, a direction in which the tensile strength of the landing plate (made of laminated wood) 4 is weak (C is the length direction of the wood piece)
Since the connecting member 5 is attached toward (−D direction),
As shown in FIG. 6, even if a load W is applied to the step board 3 on the opposite side of the landing plate 4 with the support 1 interposed therebetween, and the function of tilting the support 1 to the arrow C side works, the tilting power is used for the connecting member. 5 can be supported, and no pulling action occurs on the landing board 4.

[0042]

According to the assembling structure of the spiral staircase of the first aspect of the present invention, a wooden board is used as the landing board 4, while the upper end 1a of the column 1 and the building base material 11 are used. Are connected on the lower surface side of the landing plate 4 by a connecting member 5 having high tensile strength.

Therefore, according to the first aspect of the present invention, the function of tilting the strut 1 toward the side where the tensile strength of the landing plate 4 is low (the side in the width direction of the small wood piece in the case of laminated wood) acts. (For example, even when a load is applied to the step board 3 located on the opposite side to the landing board 4 with the support 1 interposed therebetween), the tilting power can be supported by the connecting member 5 and the tensile strength of the landing board 4 is weak. However, there is an effect that adverse effects such as cracks do not occur on the landing plate 4.

The landing board 4 is provided on the support 1 by the step boards 3, 3,.
・ After mounting, the upper end 1a of the support and the base material 11 of the building
Before the landing board 4 is installed, the connecting member 5 is interposed between the upper end portion 1a of the support and the base material 11 of the building. 1 is supported in a stable posture. Therefore, when the base end portion (hole 4e) of the landing plate 4 is fitted to the upper end portion 1a of the column, the column 1 does not become uneven. Since it is not connected, there is an effect that the floor surface 10 fixing the lower end of the column is not damaged. According to the second aspect of the present invention, in the assembly structure of the spiral staircase according to the first aspect, the connecting member 5 includes a base-side split piece 51 attached to the building base material 11 side, and an upper end of a column. By dividing the front split piece 56 from above with the base split piece 51 attached to the building base material 11 first, the front split piece 56 is divided into two parts, the front split piece 56 connected to the part 1a. Split the piece 56 to the upper end of the support 1
a and the base side split piece 51 can be interposed. Accordingly, the connecting material 5 is provided between the upper end portion 1a of the support and the building base material 11.
When connecting by using the connecting member 5, it is not necessary to fix one end of the connecting member 5 to the column upper end 1a and fix the other end of the connecting member 5 to the building base material 11; There is an effect that connection work with the base material 11 becomes easy. In particular, it is necessary to assemble the spiral stairs on a stepladder and at a high place where the scaffolding is not good. However, as in claim 2 of the present application, the connecting member 5 is divided into two parts, and The front split piece 56 between the base split piece 51 fixed to the 11 side.
If a series of connecting members 5 can be constructed simply by dropping the work, the work can be performed safely and in a short time.

[Brief description of the drawings]

FIG. 1 is a perspective view of a conventional spiral staircase.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is an explanatory view of a method of assembling a conventional spiral staircase (FIG. 1).

FIG. 5 is an exploded perspective view of each member used in the spiral staircase of the embodiment of the present application.

FIG. 6 is a sectional view (corresponding to FIG. 3) of a spiral staircase according to the embodiment of the present application.

FIG. 7 is an enlarged view taken along the line VII-VII in FIG. 6;

FIG. 8 is a partially exploded perspective view of an assembly structure of a spiral staircase according to the embodiment of the present application.

[Explanation of symbols]

1 is a column, 1a is a column upper end, 2 is a spacer, 3 is a step board, 4 is a landing plate, 5 is a connecting member, 6 is a handrail member, 7 is a fence member, 8 is a column member, 9 is a screw member, 10 Is a floor surface, 11 is a base material of a building, 12 is a receiving crosspiece, 51 is a base split piece, 52 is a mounting section, 53 is an engagement receiving section, 56 is a front split piece, 57 is a ring section, and 58 is a lock. It is a joint.

Claims (2)

[Claims] 1. A plurality of steps (3, 3) for a support (1).
In a spiral staircase in which 3) are spirally arranged and a landing plate (4) is attached to the upper part of the support (1), a wooden plate is used as the landing plate (4), while the support (1) The upper end portion (1a) of the spiral staircase and the building base material (11) are connected by a connecting member (5) having a high tensile strength on the lower surface side of the landing plate (4). 2. The connecting member (5) according to claim 1, wherein the connecting member (5) is provided at one end with a base split piece (51) provided with an attaching portion (52) that can be attached to the building base material (11), and at one end, a column upper end. Into two parts: a first split piece (56) provided with a ring portion (57) that can be fitted into the portion (1a) from above, and the other end of the base split piece (51) and the first split piece (56) Receiving portions (53) mutually engaged with and connected to the other ends of the members.
And the engaging portion (58) are formed, while the mounting portion (52) of the base split piece (51) is fixed to the building base material (11) and the support (1) is erected at a predetermined position. Then, the ring portion (57) and the engaging portion (58) of the front split piece (56) are connected to the upper end portion (1a) of the support column and the base split piece (5).
An assembly structure for a spiral staircase, wherein the assembly can be engaged with the engagement receiving portion (53) of 1) from above.