JP2021080645A - Girder fitting structure of staircase and construction method of staircase - Google Patents

Girder fitting structure of staircase and construction method of staircase Download PDF

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JP2021080645A
JP2021080645A JP2019206413A JP2019206413A JP2021080645A JP 2021080645 A JP2021080645 A JP 2021080645A JP 2019206413 A JP2019206413 A JP 2019206413A JP 2019206413 A JP2019206413 A JP 2019206413A JP 2021080645 A JP2021080645 A JP 2021080645A
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girder
skeleton
fixing
fixing plate
end surface
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JP7356872B2 (en
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勝也 添田
Katsuya Soeda
勝也 添田
貴浩 平山
Takahiro Hirayama
貴浩 平山
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Lixil Corp
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Abstract

To provide the girder fitting structure of a staircase with metal fittings inconspicuously on an outer side face of the girder of a low cost and simple structure, and a construction method of the staircase.SOLUTION: A girder fitting structure has a girder and a fixing fitting metal for attaching an upper end part of the girder to a skeleton. The fixing fitting metal has a butt end fixing plate part screwed to the butt end of the upper end of the girder and a pair of skeleton fixing plate parts continued to the butt end fixing plate part and extended outside and inside the girder. The upper end part of the girder is fixed to the skeleton by screwing the pair of the skeleton fixing plate parts of the fixing fitting metal to the skeleton.SELECTED DRAWING: Figure 6

Description

本開示は、階段の桁取付け構造及び階段の施工方法に関する。 The present disclosure relates to a staircase girder mounting structure and a staircase construction method.

近年、住宅等の建物に施工される階段として、意匠性を向上させたオープン型階段の需要が増えている。オープン型階段は、蹴込み板がなく、床面から上階の躯体に亘って架設される桁に踏み板を固定したシースルー構造を有する。そのため、階段がリビング内に設置されても、開放的でインテリア性の高いリビング空間を創出することができる。 In recent years, there has been an increasing demand for open stairs with improved design as stairs to be constructed in buildings such as houses. The open staircase has a see-through structure in which the tread plate is fixed to a girder erected from the floor surface to the upper floor skeleton without a riser plate. Therefore, even if the stairs are installed in the living room, it is possible to create an open and highly interior living space.

従来、桁の上端部の取付け構造として、桁の外側面及び内側面から躯体にかけてそれぞれＬ型の金具を取り付け、桁及び躯体に対してそれぞれ固定用ビスを打ち込むことによって固定するものが知られている（例えば、特許文献１参照）。 Conventionally, as a mounting structure for the upper end of a girder, an L-shaped metal fitting is attached from the outer side surface and the inner side surface of the girder to the skeleton, and fixed by driving fixing screws into the girder and the skeleton, respectively. (See, for example, Patent Document 1).

特開２０１４−７０３９６号公報Japanese Unexamined Patent Publication No. 2014-70396

しかしながら、桁の上端部をＬ型の金具を使用して固定する構造では、桁の外側面に金具が露出するため、桁を外側から目視した際に金具が目立ってしまう。そのため、本発明者は、従来のように桁の上端部を取り付ける構造では、階段の意匠性を低下させるおそれがあることを見出した。金具が外側面に露出しないように、桁の上端部の木口面を掘り込んだ凹部内に金具を完全に収納し、この金具を、躯体に取り付けられたフック状の金具に引っ掛けるようにすることも考えられるが、木口面に対して複雑な掘り込み加工を施す必要があり、加工工数が増加するため、コスト高となる問題がある。 However, in the structure in which the upper end of the girder is fixed by using the L-shaped metal fitting, the metal fitting is exposed on the outer surface of the girder, so that the metal fitting becomes conspicuous when the girder is visually observed from the outside. Therefore, the present inventor has found that the structure in which the upper end portion of the girder is attached as in the conventional case may reduce the design of the stairs. To prevent the metal fittings from being exposed to the outer surface, completely store the metal fittings in the recesses dug into the end surface of the girder, and hook the metal fittings on the hook-shaped metal fittings attached to the skeleton. However, there is a problem that the cost increases because it is necessary to perform complicated digging processing on the end surface of the wood and the processing man-hours increase.

本開示は、桁の外側面に金具が目立つことがなく、低コストで構造簡単な階段の桁取付け構造及び階段の施工方法を提供することを目的とする。 An object of the present disclosure is to provide a staircase girder mounting structure and a staircase construction method in which metal fittings are not conspicuous on the outer surface of the girder and the structure is simple at low cost.

本開示の階段の桁取付け構造は、桁と、前記桁の上端部を躯体に取り付ける固定金具と、を有し、前記固定金具は、前記桁の前記上端部の木口面にねじ止めされる木口面固定板部と、前記木口面固定板部に連続して前記桁の外側及び内側に延出する一対の躯体固定板部と、を有し、前記桁の前記上端部は、前記固定金具の前記一対の躯体固定板部が前記躯体に対してねじ止めされることによって、前記躯体に固定される。 The girder mounting structure of the stairs of the present disclosure includes a girder and a fixing bracket for attaching the upper end portion of the girder to the skeleton, and the fixing bracket is screwed to the end surface of the upper end portion of the girder. It has a surface fixing plate portion and a pair of skeleton fixing plate portions extending outward and inward of the girder continuously to the wood end surface fixing plate portion, and the upper end portion of the girder is of the fixing metal fitting. The pair of skeleton fixing plate portions are fixed to the skeleton by being screwed to the skeleton.

本開示の階段の施工方法は、桁の上端部の木口面に、前記木口面にねじ止めされる木口面固定板部と、前記木口面固定板部に連続して前記桁の外側及び内側に延出する一対の躯体固定板部と、を有する固定金具を取り付け、前記固定金具の前記一対の躯体固定板部を躯体に対してねじ止めすることによって、前記桁の前記上端部を前記躯体に固定する。 In the method of constructing the stairs of the present disclosure, the wood end surface of the upper end of the girder is screwed to the wood end surface, and the wood end surface fixing plate portion is continuously connected to the outside and inside of the girder. A fixing bracket having a pair of extending skeleton fixing plate portions is attached, and the pair of skeleton fixing plate portions of the fixing bracket are screwed to the skeleton to attach the upper end portion of the girder to the skeleton. Fix it.

階段の桁取付け構造を示す斜視図である。It is a perspective view which shows the girder mounting structure of a staircase. 階段の桁取付け構造を躯体側から見た斜視図である。It is a perspective view of the girder attachment structure of the stairs seen from the skeleton side. 固定金具を示す斜視図である。It is a perspective view which shows the fixing metal fitting. 桁の上端部の木口面に固定金具を固定する様子を示す側面図である。It is a side view which shows the state of fixing the fixing metal fitting to the end surface of the upper end of a girder. 桁の上端部の木口面に固定金具を固定する様子を示す斜視図である。It is a perspective view which shows the state of fixing the fixing metal fitting to the end surface of the upper end of a girder. 桁の上端部を躯体に仮固定する様子を示す斜視図である。It is a perspective view which shows the state which the upper end part of a girder is temporarily fixed to a skeleton. 躯体に本固定された桁の上端部を示す正面図である。It is a front view which shows the upper end part of the girder which was fixed to the skeleton. 階段の上部を桁の外側から見た側面図である。It is a side view of the upper part of the stairs seen from the outside of the girder. 階段の上部を桁の内側から見た側面図である。It is a side view of the upper part of the stairs seen from the inside of the girder.

以下、本開示の一態様に係る階段の桁取付け構造について、図面を参照して説明する。図１に示すように、階段１は、左右一対の桁２，２と、この桁２，２に亘って設けられる複数枚の踏み板３と、を有する。桁２，２及び踏み板３は、いずれも木質材によって形成される。この階段１は、上下に隣り合う踏み板３，３の間に蹴込み板が設けられないオープン型階段である。 Hereinafter, the girder mounting structure of the stairs according to one aspect of the present disclosure will be described with reference to the drawings. As shown in FIG. 1, the staircase 1 has a pair of left and right girders 2 and 2 and a plurality of tread plates 3 provided over the girders 2 and 2. The girders 2 and 2 and the tread plate 3 are all made of wood. The staircase 1 is an open type staircase in which a riser plate is not provided between the vertically adjacent tread plates 3 and 3.

踏み板３は、一対の受け金具３１，３１によって、桁２，２の内側面２ａ，２ａに固定される。受け金具３１，３１は桁２，２よりも上方に張り出している。そのため、踏み板３は、桁２，２の上方に浮き上がるように取り付けられている。各踏み板３は、桁２，２の間隔よりも幅広に形成され、桁２，２の両外側にそれぞれ張り出している。 The tread plate 3 is fixed to the inner side surfaces 2a and 2a of the girders 2 and 2 by a pair of receiving metal fittings 31 and 31. The receiving metal fittings 31 and 31 project above the girders 2 and 2. Therefore, the tread plate 3 is attached so as to rise above the girders 2 and 2. Each tread plate 3 is formed wider than the distance between the girders 2 and 2, and projects to both outer sides of the girders 2 and 2, respectively.

桁２，２は、所定の間隔で離隔して平行に配置され、床面（図示せず）から上階の躯体１００に亘って斜めに架設される。桁２，２の上端部２ｃ，２ｃの木口面２ｄ，２ｄは、桁２，２の傾斜角度に従って、躯体１００の表面と平行になるように斜めに切断されている。桁２，２の上端部２ｃ，２ｃは、桁２，２の木口面２ｄ，２ｄにそれぞれ個別に取り付けられた固定金具４，４によって、躯体１００に固定される。 The girders 2 and 2 are arranged in parallel at predetermined intervals, and are erected diagonally from the floor surface (not shown) to the skeleton 100 on the upper floor. The end surfaces 2d and 2d of the upper ends 2c and 2c of the girders 2 and 2 are cut diagonally so as to be parallel to the surface of the skeleton 100 according to the inclination angle of the girders 2 and 2. The upper end portions 2c and 2c of the girders 2 and 2 are fixed to the skeleton 100 by the fixing metal fittings 4 and 4 individually attached to the wood end surfaces 2d and 2d of the girders 2 and 2, respectively.

一対の桁２，２及び一対の固定金具４，４は、いずれも登段者から見て左右対称構造を有する。したがって、以下においては、登段者から見て右側に配置される桁２の取付け構造について図示して説明する。以下の説明において、桁２，２及び固定金具４，４の左右を区別する際は、登段者から見て右側に配置される桁２を「桁２Ｒ」、左側に配置される桁２を「桁２Ｌ」と称し、右側に配置される固定金具４を「固定金具４Ｒ」、左側に配置される固定金具４を「固定金具４Ｌ」と称する場合がある。 The pair of girders 2 and 2 and the pair of fixing brackets 4 and 4 all have a symmetrical structure when viewed from a climber. Therefore, in the following, the mounting structure of the girder 2 arranged on the right side when viewed from the climber will be illustrated and described. In the following description, when distinguishing the left and right of the girders 2 and 2 and the fixing brackets 4 and 4, the girder 2 placed on the right side when viewed from the climber is referred to as "girder 2R", and the girder 2 placed on the left side is referred to as "girder 2R". It may be referred to as "girder 2L", the fixing metal fitting 4 arranged on the right side may be referred to as "fixing metal fitting 4R", and the fixing metal fitting 4 arranged on the left side may be referred to as "fixing metal fitting 4L".

次に、固定金具４の具体的な構造について図３を参照して詳細に説明する。図３は、桁２の木口面２ｄに対して当接する側から見た固定金具４Ｒを示している。図３において、Ｘ方向は、固定金具４及び桁２の木口面２ｄの幅方向（左右方向）を示す。したがって、固定金具４ＲにおけるＸ１方向は桁２の外側であり、Ｘ２方向は桁２の内側である。Ｙ方向は、Ｘ方向に直交する方向であり、固定金具４及び桁２の木口面２ｄの高さ方向を示す。Ｙ１方向は上方であり、Ｙ２方向は下方である。上述したように一対の固定金具４，４は左右対称構造であるため、左側の固定金具４Ｌは、図３に示す固定金具４Ｒに対してＸ方向に沿う左右方向に対称である。 Next, the specific structure of the fixing bracket 4 will be described in detail with reference to FIG. FIG. 3 shows the fixing bracket 4R seen from the side that comes into contact with the end surface 2d of the girder 2. In FIG. 3, the X direction indicates the width direction (left-right direction) of the end surface 2d of the fixing bracket 4 and the girder 2. Therefore, the X1 direction of the fixing bracket 4R is outside the girder 2, and the X2 direction is inside the girder 2. The Y direction is a direction orthogonal to the X direction, and indicates the height direction of the end surface 2d of the fixing bracket 4 and the girder 2. The Y1 direction is upward and the Y2 direction is downward. As described above, since the pair of fixing brackets 4 and 4 have a symmetrical structure, the fixing bracket 4L on the left side is symmetrical with respect to the fixing bracket 4R shown in FIG. 3 in the left-right direction along the X direction.

固定金具４は、ステンレス鋼板等の金属板材によって構成され、固定金具４の本体部分である一つの木口面固定板部４１と、一対の躯体固定板部４２，４２と、一つの内側面固定板部４３と、を一体に有する。 The fixing bracket 4 is made of a metal plate material such as a stainless steel plate, and has one wood end surface fixing plate portion 41 which is a main body portion of the fixing bracket 4, a pair of skeleton fixing plate portions 42, 42, and one inner side surface fixing plate. The unit 43 and the unit 43 are integrally provided.

木口面固定板部４１は、図３中の１点鎖線で示すように、桁２の木口面２ｄに対応する幅を有する矩形状の平板部である。木口面固定板部４１の高さは、幅よりも長尺に形成されている。木口面固定板部４１には、固定金具４を桁２の木口面２ｄに対してねじ固定するための複数のねじ挿通穴４１１が設けられている。このねじ挿通穴４１１は、木口面固定板部４１に対して躯体１００側から皿もみ加工された皿穴である。図３に示す木口面固定板部４１には、幅方向に並置される一対のねじ挿通穴４１１，４１１が、高さ方向に３組設けられている。しかし、ねじ挿通穴４１１の数及び配置構成は、図示するものに限定されない。 As shown by the alternate long and short dash line in FIG. 3, the wood end surface fixing plate portion 41 is a rectangular flat plate portion having a width corresponding to the wood end surface 2d of the girder 2. The height of the end surface fixing plate portion 41 is formed to be longer than the width. The wood end surface fixing plate portion 41 is provided with a plurality of screw insertion holes 411 for screwing the fixing metal fitting 4 to the wood end surface 2d of the girder 2. The screw insertion hole 411 is a countersunk hole that is countersunk from the skeleton 100 side with respect to the wood end surface fixing plate portion 41. The wood end surface fixing plate portion 41 shown in FIG. 3 is provided with three sets of a pair of screw insertion holes 411 and 411 arranged side by side in the width direction in the height direction. However, the number and arrangement of the screw insertion holes 411 are not limited to those shown in the figure.

躯体固定板部４２，４２は、それぞれ木口面固定板部４１よりも細幅矩形状に形成された平板部であり、木口面固定板部４１から左右方向にそれぞれ延出している。詳しくは、躯体固定板部４２，４２は、木口面固定板部４１の幅方向の両端部から木口面固定板部４１に対して一体的に連続して桁２の外側及び内側にそれぞれ延びている。木口面固定板部４１と躯体固定板部４２，４２とは面一状である。躯体固定板部４２，４２には、躯体１００に対してねじ固定するための複数のねじ挿通穴４２１がそれぞれ設けられている。このねじ挿通穴４２１は、躯体固定板部４２，４２に対して躯体１００と反対側から皿もみ加工された皿穴である。図３に示す躯体固定板部４２，４２には、高さ方向に沿って一直線上に並んだ３つのねじ挿通穴４２１がそれぞれ設けられている。しかし、ねじ挿通穴４２１の数及び配置構成は、図示するものに限定されない。 The skeleton fixing plate portions 42 and 42 are flat plate portions formed in a narrower rectangular shape than the wood end surface fixing plate portion 41, and extend from the wood end surface fixing plate portion 41 in the left-right direction, respectively. Specifically, the skeleton fixing plate portions 42, 42 extend integrally and continuously with respect to the wood end surface fixing plate portion 41 from both ends in the width direction of the wood end surface fixing plate portion 41 to the outside and the inside of the girder 2, respectively. There is. The end surface fixing plate portion 41 and the skeleton fixing plate portions 42, 42 are flush with each other. The skeleton fixing plate portions 42, 42 are each provided with a plurality of screw insertion holes 421 for screw fixing to the skeleton 100. The screw insertion hole 421 is a countersunk hole that is countersunk from the side opposite to the skeleton 100 with respect to the skeleton fixing plate portions 42, 42. The skeleton fixing plate portions 42 and 42 shown in FIG. 3 are provided with three screw insertion holes 421 arranged in a straight line along the height direction, respectively. However, the number and arrangement of the screw insertion holes 421 are not limited to those shown in the figure.

躯体固定板部４２，４２は、それぞれ木口面固定板部４１とほぼ等しい高さを有する。しかし、躯体固定板部４２，４２は、それぞれ木口面固定板部４１に対して上方に偏移して配置されている。別の言い方をすると、木口面固定板部４１は、躯体固定板部４２，４２に対して下方に偏移して配置されている。そのため、躯体固定板部４２，４２は、同一幅を維持して木口面固定板部４１よりも上方に向けて延出する上方延出部４２ａ，４２ａを有し、木口面固定板部４１は、同一幅を維持して躯体固定板部４２，４２よりも下方に向けて延出する下方延出部４１ａを有する。 The skeleton fixing plate portions 42 and 42 have substantially the same height as the wood end surface fixing plate portion 41, respectively. However, the skeleton fixing plate portions 42 and 42 are arranged so as to be offset upward with respect to the wood end surface fixing plate portion 41, respectively. In other words, the wood end surface fixing plate portion 41 is arranged so as to be offset downward with respect to the skeleton fixing plate portions 42, 42. Therefore, the skeleton fixing plate portions 42 and 42 have upward extending portions 42a and 42a that maintain the same width and extend upward from the wood end surface fixing plate portion 41, and the wood end surface fixing plate portion 41 It has a downward extending portion 41a that maintains the same width and extends downward from the skeleton fixing plate portions 42, 42.

躯体固定板部４２，４２のねじ挿通穴４２１は、上方延出部４２ａ，４２ａよりも下方に配置され、上方延出部４２ａ，４２ａには設けられていない。上方延出部４２ａ，４２ａには、後述する仮固定ねじ１０１に引っ掛ける引っ掛け穴４２２が一つずつ設けられている。この引っ掛け穴４２２は、躯体１００に設けられた仮固定用部材である仮固定ねじ１０１に対して桁２の上端部２ｃを仮固定するための仮固定部である。引っ掛け穴４２２は、ねじ挿通穴４２１に対して一直線上に並んでいる。 The screw insertion holes 421 of the skeleton fixing plate portions 42, 42 are arranged below the upward extending portions 42a, 42a, and are not provided in the upward extending portions 42a, 42a. The upward extending portions 42a and 42a are provided with one hook hole 422 for hooking on the temporary fixing screw 101 described later. The hook hole 422 is a temporary fixing portion for temporarily fixing the upper end portion 2c of the girder 2 to the temporary fixing screw 101 which is a temporary fixing member provided in the skeleton 100. The hook holes 422 are aligned with the screw insertion hole 421.

図３に示す引っ掛け穴４２２は、仮固定ねじ１０１の頭部を挿通させる挿通穴４２２ａ及び仮固定ねじ１０１の軸部を締め付ける締付穴４２２ｂを有するだるま穴によって構成されている。締付穴４２２ｂは、挿通穴４２２ａに対して上方に配置されている。しかし、引っ掛け穴４２２は、仮固定ねじ１０１を挿通させて固定金具４を引っ掛けることができるように構成される穴であればよく、だるま穴に限定されない。また、仮固定用部材と仮固定部は、仮固定ねじ１０１と引っ掛け穴４２２に限定されない。例えば仮固定用部材として躯体１００にフックを設け、仮固定部として上方延出部４２ａ，４２ａにフックと係合する溝、スリット等を設けるようにしてもよく、互いに係止又は係合することによって桁２の上端部２ｃを仮固定できるものであればよい。 The hook hole 422 shown in FIG. 3 is composed of a daruma hole having an insertion hole 422a through which the head of the temporary fixing screw 101 is inserted and a tightening hole 422b for tightening the shaft portion of the temporary fixing screw 101. The tightening hole 422b is arranged above the insertion hole 422a. However, the hook hole 422 is not limited to the Daruma hole as long as it is a hole configured so that the fixing metal fitting 4 can be hooked by inserting the temporary fixing screw 101. Further, the temporary fixing member and the temporary fixing portion are not limited to the temporary fixing screw 101 and the hook hole 422. For example, a hook may be provided on the skeleton 100 as a temporary fixing member, and a groove, a slit, or the like that engages with the hook may be provided on the upward extending portions 42a, 42a as the temporary fixing portion, and the hooks may be locked or engaged with each other. Anything can be used as long as the upper end portion 2c of the girder 2 can be temporarily fixed.

内側面固定板部４３は、固定金具４の下端部に配置され、木口面固定板部４１に対して躯体１００と反対方向に垂直に延びている。詳しくは、内側面固定板部４３は、木口面固定板部４１の下方延出部４１ａにおける桁２の内側面２ａ側に配置される側縁のみに設けられている。したがって、図３に示す固定金具４Ｒにおいては、内側面固定板部４３は、木口面固定板部４１の下方延出部４１ａに対してＸ２方向に配置される側縁に設けられている。図示しない左側の固定金具４Ｌの場合は、内側面固定板部４３は、木口面固定板部４１の下方延出部４１ａに対してＸ１方向に配置される側縁に設けられる。 The inner side surface fixing plate portion 43 is arranged at the lower end portion of the fixing metal fitting 4, and extends perpendicularly to the wood end surface fixing plate portion 41 in the direction opposite to the skeleton 100. Specifically, the inner side surface fixing plate portion 43 is provided only on the side edge arranged on the inner side surface 2a side of the girder 2 in the downward extending portion 41a of the wood end surface fixing plate portion 41. Therefore, in the fixing bracket 4R shown in FIG. 3, the inner side surface fixing plate portion 43 is provided on the side edge arranged in the X2 direction with respect to the downward extending portion 41a of the wood end surface fixing plate portion 41. In the case of the fixing bracket 4L on the left side (not shown), the inner side surface fixing plate portion 43 is provided on the side edge arranged in the X1 direction with respect to the downward extending portion 41a of the wood end surface fixing plate portion 41.

内側面固定板部４３は、木口面固定板部４１から桁２の内側に向けて面一状に連続して延出させた平板片を、躯体１００と反対方向に直角に折り曲げることによって形成されている。そのため、内側面固定板部４３を有する固定金具４は、所定の形状に切り出した一枚の金属板材を折り曲げ成形することによって簡単に製造することができる。内側面固定板部４３を折り曲げ成形する前の木口面固定板部４１に対する内側面固定板部４３の幅方向の延出量は、木口面固定板部４１に対する躯体固定板部４２の幅方向の延出量と同一であってよい。 The inner side surface fixing plate portion 43 is formed by bending a flat plate piece continuously extending in a plane from the wood end surface fixing plate portion 41 toward the inside of the girder 2 at a right angle in the direction opposite to the skeleton 100. ing. Therefore, the fixing metal fitting 4 having the inner side surface fixing plate portion 43 can be easily manufactured by bending and molding a single metal plate material cut out into a predetermined shape. The amount of extension of the inner side surface fixing plate portion 43 in the width direction with respect to the wood end surface fixing plate portion 41 before bending and molding the inner side surface fixing plate portion 43 is the width direction of the skeleton fixing plate portion 42 with respect to the wood end surface fixing plate portion 41. It may be the same as the extension amount.

内側面固定板部４３には、桁２の内側面２ａに対してねじ固定するための複数のねじ挿通穴４３１が設けられている。このねじ挿通穴４３１は、内側面固定板部４３に対して桁２の内側面２ａと反対側から皿もみ加工された皿穴である。図３に示す内側面固定板部４３には、高さ方向に沿って並んだ２つのねじ挿通穴４３１，４３１が設けられている。しかし、ねじ挿通穴４３１の数及び配置構成は、図示するものに限定されない。 The inner side surface fixing plate portion 43 is provided with a plurality of screw insertion holes 431 for screw fixing to the inner side surface 2a of the girder 2. The screw insertion hole 431 is a countersunk hole that is countersunk from the side opposite to the inner side surface 2a of the girder 2 with respect to the inner side surface fixing plate portion 43. The inner side surface fixing plate portion 43 shown in FIG. 3 is provided with two screw insertion holes 431 and 431 arranged along the height direction. However, the number and arrangement of the screw insertion holes 431 are not limited to those shown in the figure.

固定金具４は、図４及び図５に示すように、木口面固定板部４１によって桁２の木口面２ｄに取り付けられる。詳しくは、固定金具４は、木口面固定板部４１を桁２の木口面２ｄに当接させ、内側面固定板部４３を桁２の内側面２ａに当接させた後、木口面固定板部４１のねじ挿通穴４１１及び内側面固定板部４３のねじ挿通穴４３１を挿通する固定用ねじ４４，４５によって、桁２の木口面２ｄ及び内側面２ａに固定される。固定用ねじ４４，４５は皿ねじである。 As shown in FIGS. 4 and 5, the fixing bracket 4 is attached to the wood end surface 2d of the girder 2 by the wood end surface fixing plate portion 41. Specifically, in the fixing bracket 4, the wood end surface fixing plate portion 41 is brought into contact with the wood end surface 2d of the girder 2, the inner side surface fixing plate portion 43 is brought into contact with the inner side surface 2a of the girder 2, and then the wood end surface fixing plate is brought into contact with the wood end surface fixing plate. It is fixed to the end surface 2d and the inner side surface 2a of the girder 2 by the fixing screws 44 and 45 through which the screw insertion hole 411 of the portion 41 and the screw insertion hole 431 of the inner side surface fixing plate portion 43 are inserted. The fixing screws 44 and 45 are countersunk screws.

このように、固定金具４は、木口面固定板部４１によって桁２の木口面２ｄに対して固定されるだけでなく、内側面固定板部４３によって桁２の内側面２ａに対しても固定されるため、桁２に対して強固に固定される。すなわち、木口面固定板部４１を固定する固定用ねじ４４は、木口面２ｄから桁２の長さ方向に延びる木質繊維に沿ってねじ込まれるため、一般に引抜き耐力が低い。これに対して、内側面固定板部４３を固定する固定用ねじ４５は、内側面２ａから桁２の木質繊維と交差してねじ込まれるため、引抜き耐力が高い。そのため、内側面固定板部４３を固定用ねじ４５を用いて固定することによって、固定用ねじ４４の引抜き耐力の低さを補うことができ、固定金具４を桁２に対して強固に固定することができる。しかも、内側面固定板部４３は、固定金具４の下端部且つ桁２の内側面２ａに配置されるため、登段者からも目視され難い。 In this way, the fixing bracket 4 is not only fixed to the wood end surface 2d of the girder 2 by the wood end surface fixing plate portion 41, but also fixed to the inner side surface 2a of the girder 2 by the inner side surface fixing plate portion 43. Therefore, it is firmly fixed to the girder 2. That is, since the fixing screw 44 for fixing the wood end surface fixing plate portion 41 is screwed along the wood fiber extending from the wood end surface 2d in the length direction of the girder 2, the pull-out resistance is generally low. On the other hand, the fixing screw 45 for fixing the inner side surface fixing plate portion 43 is screwed from the inner side surface 2a so as to intersect with the wood fiber of the girder 2, and therefore has a high pull-out resistance. Therefore, by fixing the inner side surface fixing plate portion 43 with the fixing screw 45, it is possible to compensate for the low pull-out strength of the fixing screw 44, and the fixing metal fitting 4 is firmly fixed to the girder 2. be able to. Moreover, since the inner side surface fixing plate portion 43 is arranged at the lower end portion of the fixing metal fitting 4 and the inner side surface 2a of the girder 2, it is difficult for a climber to see it.

固定金具４の木口面固定板部４１が当接する桁２の木口面２ｄには、図４に示すように、固定金具４の板厚に相当する深さを有する切り欠き部２１が設けられている。切り欠き部２１は、木口面２ｄを幅方向（桁２の厚み方向）に横断している。このような切り欠き部２１は、桁２の内側面２ａ又は外側面２ｂから木口面２ｄの幅方向（桁２の厚み方向）に切削加工するだけの簡単な加工によって低コストで形成できる。 As shown in FIG. 4, a notch 21 having a depth corresponding to the plate thickness of the fixing bracket 4 is provided on the wood end surface 2d of the girder 2 with which the wood end surface fixing plate portion 41 of the fixing metal fitting 4 abuts. There is. The cutout portion 21 crosses the end surface 2d in the width direction (thickness direction of the girder 2). Such a notch portion 21 can be formed at low cost by a simple process of cutting from the inner side surface 2a or the outer surface 2b of the girder 2 in the width direction of the end surface 2d (thickness direction of the girder 2).

切り欠き部２１の高さ方向の寸法は、固定金具４の木口面固定板部４１の高さ方向の寸法よりも大きい。固定金具４の木口面固定板部４１は、木口面２ｄにおける切り欠き部２１内に完全に収容されるため、木口面２ｄよりも躯体１００側に突出しない。そのため、固定金具４が取り付けられた桁２の木口面２ｄは、躯体１００に浮き上がることなく密接することができる。しかも、木口面固定板部４１は、切り欠き部２１内で高さ方向に移動可能であるため、ねじ固定する前に高さ方向の位置を微調整可能である。 The dimension in the height direction of the notch portion 21 is larger than the dimension in the height direction of the end surface fixing plate portion 41 of the fixing bracket 4. Since the wood end surface fixing plate portion 41 of the fixing metal fitting 4 is completely housed in the notch portion 21 in the wood end surface 2d, it does not protrude toward the skeleton 100 side from the wood end surface 2d. Therefore, the end surface 2d of the girder 2 to which the fixing metal fitting 4 is attached can be brought into close contact with the skeleton 100 without being lifted. Moreover, since the wood end surface fixing plate portion 41 can be moved in the height direction in the notch portion 21, the position in the height direction can be finely adjusted before the screw is fixed.

図４に示すように、桁２の内側面２ａには、固定金具４の内側面固定板部４３のねじ挿通穴４３１に対応する位置に、位置出し用下穴２２が設けられている。位置出し用下穴２２は、桁２の内側面２ａに、桁２Ｒ，２Ｌで同一位置となるように予め位置決めされている。したがって、固定金具４の木口面固定板部４１を木口面２ｄの切り欠き部２１内に収容した後、位置出し用下穴２２とこの位置出し用下穴２２に対応する内側面固定板部４３のねじ挿通穴４３１とが一致するように固定金具４の位置を微調整することによって、固定金具４の位置決めを容易に行うことができる。位置出し用下穴２２は、内側面固定板部４３の複数のねじ挿通穴４３１のうちの少なくとも一つに対応して、少なくとも一つあればよい。 As shown in FIG. 4, the inner side surface 2a of the girder 2 is provided with a pilot hole 22 for positioning at a position corresponding to the screw insertion hole 431 of the inner side surface fixing plate portion 43 of the fixing bracket 4. The positioning pilot hole 22 is pre-positioned on the inner side surface 2a of the girder 2 so that the girders 2R and 2L are at the same position. Therefore, after the wood end surface fixing plate portion 41 of the fixing bracket 4 is housed in the notch portion 21 of the wood end surface 2d, the positioning pilot hole 22 and the inner side surface fixing plate portion 43 corresponding to the positioning pilot hole 22 are accommodated. By finely adjusting the position of the fixing bracket 4 so that it coincides with the screw insertion hole 431 of the above, the fixing bracket 4 can be easily positioned. The positioning pilot hole 22 may be at least one corresponding to at least one of the plurality of screw insertion holes 431 of the inner side surface fixing plate portion 43.

以上のようにして桁２の木口面２ｄに固定金具４が固定された後、桁２は躯体１００に仮固定される。詳しくは、躯体１００における桁２の固定部位には、図６に示すように、固定金具４の一対の引っ掛け穴４２２，４２２に対応する一対の仮固定ねじ１０１，１０１が、頭部を躯体１００から少し浮かせた状態で予めねじ込まれている。まず、引っ掛け穴４２２，４２２の挿通穴４２２ａ，４２２ａに仮固定ねじ１０１，１０１の頭部を挿通させる。その後、桁２の上端部２ｃを僅かに下方にずらすことによって、仮固定ねじ１０１，１０１の軸部を引っ掛け穴４２２，４２２の締付穴４２２ｂ，４２２ｂに挿入させる。これによって、仮固定ねじ１０１，１０１が締め付けられ、桁２の上端部２ｃが固定金具４を介して躯体１００に仮固定される。 After the fixing bracket 4 is fixed to the end surface 2d of the girder 2 as described above, the girder 2 is temporarily fixed to the skeleton 100. Specifically, as shown in FIG. 6, a pair of temporary fixing screws 101 and 101 corresponding to a pair of hook holes 422 and 422 of the fixing bracket 4 are attached to the fixing portion of the girder 2 in the skeleton 100, and the head is set to the skeleton 100. It is pre-screwed in a state where it is slightly lifted from. First, the heads of the temporary fixing screws 101 and 101 are inserted into the insertion holes 422a and 422a of the hook holes 422 and 422. After that, by slightly shifting the upper end portion 2c of the girder 2 downward, the shaft portions of the temporary fixing screws 101 and 101 are inserted into the tightening holes 422b and 422b of the hook holes 422 and 422. As a result, the temporary fixing screws 101 and 101 are tightened, and the upper end portion 2c of the girder 2 is temporarily fixed to the skeleton 100 via the fixing metal fitting 4.

仮固定の後、桁２の上端部２ｃは、図７に示すように、固定金具４の躯体固定板部４２のねじ挿通穴４２１にそれぞれ挿通される固定用ねじ４６によって躯体１００に本固定される。固定用ねじ４６は皿ねじである。桁２は、躯体１００に仮固定されているため、桁２が安定した状態で本固定のためのねじ固定を容易に行うことができる。そのため、桁２，２を躯体１００に対して取り付ける際の施工性も良好である。 After the temporary fixing, as shown in FIG. 7, the upper end portion 2c of the girder 2 is finally fixed to the skeleton 100 by the fixing screws 46 inserted into the screw insertion holes 421 of the skeleton fixing plate portion 42 of the fixing bracket 4. To. The fixing screw 46 is a countersunk screw. Since the girder 2 is temporarily fixed to the skeleton 100, the girder 2 can be easily fixed with screws for final fixing in a stable state. Therefore, the workability when attaching the girders 2 and 2 to the skeleton 100 is also good.

一対の桁２，２の上端部２ｃ，２ｃが躯体１００に本固定された後、桁２，２の下端部（図示せず）が床面に固定される。その後、一対の桁２，２に受け金具３１，３１を介して踏み板３が固定される。これによって、図１に示す階段１が完成する。 After the upper end portions 2c and 2c of the pair of girders 2 and 2 are finally fixed to the skeleton 100, the lower end portions (not shown) of the girders 2 and 2 are fixed to the floor surface. After that, the tread plate 3 is fixed to the pair of girders 2 and 2 via the receiving metal fittings 31 and 31. As a result, the staircase 1 shown in FIG. 1 is completed.

固定金具４は、桁２の外側面２ｂに対して固定する部位を持たないため、図８に示すように、階段１を一方の桁２の外側面２ｂ側から目視しても、桁２の外側面２ｂ上に固定金具４が目立つことはない。そのため、桁２と複数枚の踏み板３との調和によって創出される階段１の意匠性が損なわれることはない。しかも、桁２の木口面２ｄに固定金具４を固定するだけで、躯体１００に対して取り付け施工することができるため、木口面２ｄに複雑な加工を行う必要もない。したがって、本開示の一態様によれば、桁２の外側面２ｂに固定金具４が目立つことがなく、低コストで構造簡単な階段１の桁取付け構造を提供することができる。 Since the fixing bracket 4 does not have a portion to be fixed to the outer surface 2b of the girder 2, as shown in FIG. 8, even if the stairs 1 are visually observed from the outer surface 2b side of one girder 2, the girder 2 The fixing bracket 4 does not stand out on the outer side surface 2b. Therefore, the design of the stairs 1 created by the harmony between the girder 2 and the plurality of treads 3 is not impaired. Moreover, since the fixing bracket 4 can be attached to the skeleton 100 simply by fixing the fixing bracket 4 to the wood end surface 2d of the girder 2, it is not necessary to perform complicated processing on the wood end surface 2d. Therefore, according to one aspect of the present disclosure, the fixing bracket 4 is not conspicuous on the outer surface 2b of the girder 2, and it is possible to provide a girder mounting structure of the stairs 1 having a simple structure at low cost.

図９に示すように、固定金具４は、桁２の木口面２ｄのやや下方に配置される。そのため、木口面固定板部４１を木口面２ｄに対して固定する固定用ねじ４４は、踏み板３の受け金具３１を桁２の内側面２ａに固定する複数の固定用ねじ３２と干渉することはない。しかも、固定金具４の内側面固定板部４３は、木口面固定板部４１の下方延出部４１ａに配置されるため、固定用ねじ４４は、内側面固定板部４３を内側面２ａに対して固定する固定用ねじ４５に対しても干渉しない。 As shown in FIG. 9, the fixing bracket 4 is arranged slightly below the end surface 2d of the girder 2. Therefore, the fixing screw 44 for fixing the wood end surface fixing plate portion 41 to the wood end surface 2d may interfere with the plurality of fixing screws 32 for fixing the receiving metal fitting 31 of the tread plate 3 to the inner side surface 2a of the girder 2. Absent. Moreover, since the inner side surface fixing plate portion 43 of the fixing bracket 4 is arranged in the downward extending portion 41a of the wood end surface fixing plate portion 41, the fixing screw 44 attaches the inner side surface fixing plate portion 43 to the inner side surface 2a. It does not interfere with the fixing screw 45 that is fixed.

桁２を仮固定するための引っ掛け穴４２２，４２２は、一対の躯体固定板部４２，４２の上方延出部４２ａ，４２ａにそれぞれ設けられている。これによって、固定用ねじ４４が受け金具３１の固定用ねじ３２と干渉しないように固定金具４を下方に配置させても、引っ掛け穴４２２，４２２を可及的に上方に配置させることができる。そのため、躯体１００に対する桁２の仮固定状態をより安定化させることができる。 Hook holes 422 and 422 for temporarily fixing the girder 2 are provided in the upward extending portions 42a and 42a of the pair of skeleton fixing plate portions 42 and 42, respectively. As a result, even if the fixing metal fitting 4 is arranged downward so that the fixing screw 44 does not interfere with the fixing screw 32 of the receiving metal fitting 31, the hook holes 422 and 422 can be arranged as upward as possible. Therefore, the temporarily fixed state of the girder 2 with respect to the skeleton 100 can be further stabilized.

１ 階段
２ 桁
２ａ 内側面
２ｃ 上端部
２ｄ 木口面
２１ 切り欠き部
２２ 位置出し用下穴
４ 固定金具
４１ 木口面固定板部
４２ 躯体固定板部
４２ａ 上方延出部
４２２ 引っ掛け穴
４３ 内側面固定板部
４３１ ねじ挿通穴
１００ 躯体
１０１ 仮固定ねじ 1 Stairs 2 Girder 2a Inner side surface 2c Upper end 2d Wood mouth surface 21 Notch 22 Positioning pilot hole 4 Fixing bracket 41 Wood mouth surface fixing plate 42 Frame fixing plate 42a Upper extension 422 Hook hole 43 Inner side fixing plate Part 431 Screw insertion hole 100 Frame 101 Temporary fixing screw

Claims (8)

桁と、前記桁の上端部を躯体に取り付ける固定金具と、を有し、
前記固定金具は、前記桁の前記上端部の木口面にねじ止めされる木口面固定板部と、前記木口面固定板部に連続して前記桁の外側及び内側に延出する一対の躯体固定板部と、を有し、
前記桁の前記上端部は、前記固定金具の前記一対の躯体固定板部が前記躯体に対してねじ止めされることによって、前記躯体に固定される、階段の桁取付け構造。 It has a girder and a fixing bracket for attaching the upper end of the girder to the skeleton.
The fixing bracket includes a wood end surface fixing plate portion screwed to the wood end surface of the upper end portion of the girder, and a pair of skeleton fixings that extend to the outside and inside of the girder continuously to the wood end surface fixing plate portion. With a plate part,
The upper end portion of the girder is a staircase girder attachment structure in which the pair of skeleton fixing plate portions of the fixing bracket are fixed to the skeleton by being screwed to the skeleton. 前記木口面には、前記固定金具の板厚に相当する深さで幅方向に横断する切り欠き部を有し、
前記木口面固定板部は、前記切り欠き部内に収容される、請求項１に記載の階段の桁取付け構造。 The wood end surface has a notch portion that crosses in the width direction at a depth corresponding to the plate thickness of the fixing bracket.
The girder mounting structure for stairs according to claim 1, wherein the wood end surface fixing plate portion is housed in the notch portion. 前記固定金具は、前記木口面固定板部から前記桁の内側面に沿って立ち上げられる内側面固定板部を更に有し、前記内側面固定板部によって前記桁の前記内側面に対してねじ止めされる、請求項１又は２に記載の階段の桁取付け構造。 The fixing bracket further has an inner side surface fixing plate portion that is raised from the wood end surface fixing plate portion along the inner side surface of the girder, and is screwed to the inner side surface of the girder by the inner side surface fixing plate portion. The staircase girder mounting structure according to claim 1 or 2, which is stopped. 前記内側面固定板部は、前記固定金具の下端部に配置される、請求項３に記載の階段の桁取付け構造。 The girder mounting structure for stairs according to claim 3, wherein the inner side surface fixing plate portion is arranged at the lower end portion of the fixing bracket. 前記一対の躯体固定板部は、前記躯体に予め設けられた仮固定用部材に対して前記桁の前記上端部を仮固定するための仮固定部をそれぞれ有する、請求項１〜４のいずれか１項に記載の階段の桁取付け構造。 Any one of claims 1 to 4, wherein each of the pair of skeleton fixing plate portions has a temporary fixing portion for temporarily fixing the upper end portion of the girder to a temporary fixing member provided in advance on the skeleton. The staircase girder mounting structure described in item 1. 前記一対の躯体固定板部は、前記木口面固定板部よりも上方に延出する上方延出部をそれぞれ有し、
前記引っ掛け穴は、前記上方延出部にそれぞれ設けられる、請求項５に記載の階段の桁取付け構造。 The pair of skeleton fixing plate portions each have an upward extending portion extending upward from the wood end surface fixing plate portion.
The girder mounting structure for stairs according to claim 5, wherein each of the hook holes is provided in the upward extending portion. 桁の上端部の木口面に、前記木口面にねじ止めされる木口面固定板部と、前記木口面固定板部に連続して前記桁の外側及び内側に延出する一対の躯体固定板部と、を有する固定金具を取り付け、
前記固定金具の前記一対の躯体固定板部を躯体に対してねじ止めすることによって、前記桁の前記上端部を前記躯体に固定する、階段の施工方法。 On the wood end surface of the upper end of the girder, a wood end surface fixing plate portion screwed to the wood end surface and a pair of skeleton fixing plate portions extending outward and inward of the girder continuously to the wood end surface fixing plate portion. And attach the fixing bracket with,
A method of constructing a staircase, in which the upper end portion of the girder is fixed to the skeleton by screwing the pair of skeleton fixing plate portions of the fixing bracket to the skeleton. 前記桁の前記上端部を、前記固定金具によって前記躯体に仮固定した後、前記固定金具の前記一対の躯体固定板部を前記躯体に対してねじ止めして本固定する、請求項７に記載の階段の施工方法。 The seventh aspect of claim 7, wherein the upper end portion of the girder is temporarily fixed to the skeleton by the fixing bracket, and then the pair of skeleton fixing plate portions of the fixing bracket are screwed to the skeleton for main fixing. How to construct the stairs.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55161157A (en) * 1979-05-31 1980-12-15 Matsushita Electric Works Ltd Staircase
US4296577A (en) * 1979-10-22 1981-10-27 Schuette Heinz G Helical staircase support
JP2013124532A (en) * 2011-12-16 2013-06-24 Panasonic Corp Stringer mounting member
JP2013163943A (en) * 2012-02-13 2013-08-22 Panasonic Corp Stringer mounting bracket and stringer mounting device including the same
JP2015135022A (en) * 2014-01-17 2015-07-27 住友林業株式会社 Joint structure for positioning open strings

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55161157A (en) * 1979-05-31 1980-12-15 Matsushita Electric Works Ltd Staircase
US4296577A (en) * 1979-10-22 1981-10-27 Schuette Heinz G Helical staircase support
JP2013124532A (en) * 2011-12-16 2013-06-24 Panasonic Corp Stringer mounting member
JP2013163943A (en) * 2012-02-13 2013-08-22 Panasonic Corp Stringer mounting bracket and stringer mounting device including the same
JP2015135022A (en) * 2014-01-17 2015-07-27 住友林業株式会社 Joint structure for positioning open strings

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