JP7208532B2

JP7208532B2 - Prefabricated temporary staircase

Info

Publication number: JP7208532B2
Application number: JP2019108586A
Authority: JP
Inventors: 幹雄内橋
Original assignee: 平和技研株式会社
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2023-01-19
Anticipated expiration: 2039-06-11
Also published as: JP2020200680A

Description

本発明は、建築現場等において、作業者が地上と足場との間を移動するために設置される組立式仮設階段に関するものである。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prefabricated temporary staircase installed for workers to move between the ground and a scaffolding at a construction site or the like.

一般に建築現場等では、足場を組んで作業を行うが、作業者が地上と足場との間を移動するための階段が必要となる。
例えば、特許文献１には、左右一対の側けたを一組とする二組の支持体を互いに平行に配し、両支持体を支持体の長手方向に等間隔おきに設けた複数の踏み板で連結して梯子状に形成すると共に、踏み板は左右側けた間に回転自在に枢支して、両支持体が互いに長手方向に平行移動可能に構成してある仮設階段が開示されている。
また、特許文献２には、断面ほぼ門字形に折曲げられた金属踏み板の複数と、その左右両側片へ各々ほぼΩ形のサドル金具を介して密着状態に組付け一体化される金属単管桁の左右一対とから成り、各サドル金具の第１連通長孔から各金属踏み板のセンターボルト受け入れ孔へ差し込むセンターボルトと、同じく各サドル金具の第２連通長孔から各金属踏み板における複数組の角度調整ボルト受け入れ孔へ択一的に差し込む角度調整ボルトとの一対ずつによって、その各金属踏み板と組み付けられる金属単管桁の設置傾斜角度を大小調整できるように定めた仮設階段が開示されている。 In construction sites and the like, scaffolding is generally used for work, and a staircase is required for workers to move between the ground and the scaffolding.
For example, in Patent Document 1, a plurality of footboards in which two pairs of left and right side girders are arranged parallel to each other and both supports are provided at equal intervals in the longitudinal direction of the support. Disclosed is a temporary staircase which is connected to form a ladder-like structure, with treads rotatably pivoted between left and right side girders so that both supports can move longitudinally in parallel with respect to each other.
In addition, Patent Document 2 discloses a plurality of metal footboards having a cross-section that is substantially gate-shaped, and a single metal tube that is attached to both left and right sides of the metal footboards in close contact with each other via Ω-shaped saddle metal fittings. Center bolts are inserted from the first communicating long hole of each saddle fitting into the center bolt receiving hole of each metal footboard, and similarly from the second communicating long hole of each saddle fitting a plurality of sets of each metal footboard. Disclosed is a temporary staircase in which the installation inclination angle of a metal single pipe girder assembled with each metal footboard can be adjusted by a pair of angle adjustment bolts alternatively inserted into angle adjustment bolt receiving holes. .

特開平８−１２８１９０号公報Japanese Patent Application Laid-Open No. 8722;128190 特開２０１１－２４１５６０号公報JP 2011-241560 A

特許文献１の仮設階段は、踏み板を回動させて二組の支持体を長手方向に平行移動することにより、支持体の傾斜角度を変化させることができ、仮設階段の設置角度を選択することができる。しかし、踏み板が左右側けた間に回転自在に枢支されており、分解不能な構造であるため、保管時及び搬送時の省スペース性に欠けるという課題がある。また、重量も重く、搬送、設置、及び回収等の作業を行う際に人手が必要となり、取扱い性に欠けるという課題がある。
特許文献２の仮設階段は、各サドル金具の第１連通長孔から各金属踏み板のセンターボルト受け入れ孔へ差し込むセンターボルトと、各サドル金具の第２連通長孔から各金属踏み板における複数組の角度調整ボルト受け入れ孔へ択一的に差し込む角度調整ボルトによって、各金属踏み板と、各サドル金具を介して各金属踏み板に組み付けられる金属単管桁の設置傾斜角度を調整することができる。しかし、各金属踏み板と金属単管桁の設置傾斜角度を調整するためには、各金属踏み板のセンターボルトを緩めた状態で各金属踏み板を回動させ、左右の複数組の角度調整ボルト受け入れ孔の中から、それぞれ同一角度位置にある角度調整ボルト受け入れ孔を選択して角度調整ボルトを差込み、固定ナットを締結しなければならず、角度調整に手間がかかるという課題がある。また、各金属踏み板がセンターボルトと角度調整ボルトによりサドル金具を介して金属単管桁に固定されるので、各部を分解することは可能であるが、部品点数が多く、組立及び分解の作業が煩雑で、設置及び回収に手間がかかるという課題がある。
本発明は、かかる事情に鑑みてなされたもので、部品点数が少なく、組立及び分解に手間がかからず、短時間で設置及び回収を行うことができ、使用時以外は分解して簡単に搬送することが可能で、保管時の省スペース性に優れる組立式仮設階段を提供することを目的とする。 The temporary staircase of Patent Document 1 can change the inclination angle of the supports by rotating the treads and moving the two sets of supports in parallel in the longitudinal direction, so that the installation angle of the temporary staircase can be selected. can be done. However, since the footboards are rotatably pivoted between the left and right side girders and cannot be disassembled, there is a problem of lack of space saving during storage and transportation. In addition, there is a problem that the weight is heavy, and manpower is required when carrying out operations such as transportation, installation, and recovery, and handling is lacking.
The temporary staircase disclosed in Patent Document 2 includes a center bolt inserted from a first communicating long hole of each saddle metal fitting into a center bolt receiving hole of each metal tread, and a plurality of sets of angles on each metal tread from a second communicating long hole of each saddle metal fitting. By using the angle adjustment bolts alternatively inserted into the adjustment bolt receiving holes, it is possible to adjust the installation inclination angle of each metal footboard and the metal single-tube girder assembled to each metal footboard via each saddle fitting. However, in order to adjust the installation inclination angle of each metal tread and metal single-tube girder, each metal tread is rotated with the center bolt of each metal tread loosened, and multiple sets of left and right angle adjustment bolt receiving holes are installed. It is necessary to select the angle adjusting bolt receiving holes at the same angular positions from among them, insert the angle adjusting bolts, and fasten the fixing nuts. In addition, since each metal tread is fixed to the metal single tube girder via the saddle bracket with the center bolt and angle adjustment bolt, it is possible to disassemble each part, but the number of parts is large and the work of assembling and disassembling is difficult. There is a problem that it is complicated and takes time and effort to install and collect.
The present invention has been made in view of such circumstances, and has a small number of parts, is easy to assemble and disassemble, can be installed and collected in a short time, and can be easily disassembled when not in use. To provide a prefabricated temporary staircase that can be transported and is excellent in saving space during storage.

前記目的に沿う第１の発明に係る組立式仮設階段は、建設現場の足場に設置される組立式仮設階段であって、
左右一対の本体フレームと、該各本体フレームの先側に回動可能に取付けられ前記足場の支柱に着脱可能に固定されるクランプ部と、前記左右一対の本体フレームの間に着脱可能に取付けられる複数の踏み板とを有し、
前記各本体フレームは、上辺部と、該上辺部と平行に配置された下辺部と、長手方向の一端側が前記上辺部の内側部に回動可能に連結され長手方向の他端側が前記下辺部の内側部に回動可能に連結された複数の連結片とを有して、接地面に対して傾斜角度が可変とされ、
前記各踏み板は、平面視して長方形状の踏み板本体と、該踏み板本体の各短辺の中央下部に設けられ該踏み板本体の下方に突出したくさび形突起部とを有し、
前記各連結片の長手方向の中央部には筒型に形成され前記各くさび形突起部が挿抜可能に保持されて前記各踏み板を水平に支持する踏み板取付部が形成されている。 A prefabricated temporary staircase according to a first invention that meets the above object is a prefabricated temporary staircase installed on a scaffolding at a construction site,
A pair of left and right body frames, a clamp part rotatably attached to the front side of each body frame and detachably fixed to the support of the scaffold, and a detachable attachment between the pair of left and right body frames a plurality of treads;
Each of the body frames includes an upper side portion, a lower side portion arranged parallel to the upper side portion, one longitudinal end side of which is rotatably connected to an inner portion of the upper side portion, and the other longitudinal end side of which is the lower side portion. having a plurality of connecting pieces rotatably connected to the inner part of the and having a variable inclination angle with respect to the ground surface,
Each of the footboards has a footboard body that is rectangular in plan view, and a wedge-shaped protrusion that is provided at the lower center of each short side of the footboard body and protrudes downward from the footboard body ,
At the center of each connecting piece in the longitudinal direction, there is formed a tread plate mounting portion which is formed in a cylindrical shape and retains each of the wedge-shaped protrusions so as to be insertable and removable, thereby horizontally supporting each of the tread plates.

第１の発明に係る組立式仮設階段において、前記各本体フレームに着脱可能に取付けられる１又は複数の手摺り部を有することができる。 The prefabricated temporary staircase according to the first aspect of the invention may have one or a plurality of handrails detachably attached to each of the body frames.

第１の発明に係る組立式仮設階段において、前記各手摺り部は、前記各本体フレームと平行に配置される手摺り本体と、該手摺り本体の長手方向の一側及び他側にそれぞれの上端側が回動可能に連結された一対の支持体と、該各支持体の下端側にそれぞれ設けられた下端装着部とを有し、前記各本体フレームは、該各下端装着部が着脱可能に装着されて前記各支持体を垂直に支持する支持体取付部を有することが好ましい。 In the prefabricated temporary staircase according to the first invention, each of the handrails includes a handrail body arranged parallel to each of the body frames, and a handrail body on one side and the other side in the longitudinal direction of the handrail body. Each body frame has a pair of support bodies whose upper end side is rotatably connected, and a lower end mounting part provided at the lower end side of each support body, and each of the lower end mounting parts is detachably attached to each body frame. It is preferable to have a support mounting portion attached to vertically support each of the supports.

第１の発明に係る組立式仮設階段において、前記各下端装着部は、前記各支持体の下方に突出したくさび状突起を有し、前記各支持体取付部は、長手方向の一端側が前記上辺部の外側部に回動可能に連結され、長手方向の他端側が前記下辺部の外側部に回動可能に連結されており、長手方向の中央部に前記くさび状突起が挿抜可能に保持される筒型支持部が形成されていることが更に好ましい。 In the prefabricated temporary staircase according to the first invention, each of the lower end mounting portions has a wedge-shaped projection projecting downward from each of the supports, and each of the support mounting portions has one longitudinal end side extending from the upper side. The other end in the longitudinal direction is rotatably connected to the outer portion of the lower side portion, and the wedge-shaped projection is removably held at the central portion in the longitudinal direction. It is further preferable that a cylindrical support is formed.

前記目的に沿う第２の発明に係る組立式仮設階段は、建設現場の足場に設置される組立式仮設階段であって、
左右一対の本体フレームと、該各本体フレームの先側に回動可能に取付けられ前記足場の支柱に着脱可能に固定されるクランプ部と、前記各本体フレームに着脱可能に取付けられる１又は複数の手摺り部と、前記左右一対の本体フレームの間に着脱可能に取付けられる複数の踏み板とを有し、
前記各手摺り部は、前記各本体フレームと平行に配置される手摺り本体と、該手摺り本体の長手方向の一側及び他側にそれぞれの上端側が回動可能に連結された一対の支持体と、該各支持体の下端側にそれぞれ設けられ該各支持体の下方に突出したくさび状突起を備えた下端装着部とを有し、
前記各本体フレームは、上辺部と、該上辺部と平行に配置された下辺部と、長手方向の一端側が前記上辺部の内側部に回動可能に連結され長手方向の他端側が前記下辺部の内側部に回動可能に連結された複数の連結片と、前記各下端装着部が着脱可能に装着されて前記各支持体を垂直に支持する支持体取付部とを有して、接地面に対して傾斜角度が可変とされ、
前記各支持体取付部は、長手方向の一端側が前記上辺部の外側部に回動可能に連結され、長手方向の他端側が前記下辺部の外側部に回動可能に連結されており、長手方向の中央部に前記くさび状突起が挿抜可能に保持される筒型支持部が形成され、
前記各踏み板は、平面視して長方形状の踏み板本体と、該踏み板本体の各短辺の中央下部に設けられた装着部とを有し、
前記各連結片の長手方向の中央部には前記各装着部が着脱可能に装着されて前記各踏み板を水平に支持する踏み板取付部が形成されている。
第１、第２の発明に係る組立式仮設階段において、前記各手摺り部は、前記一対の支持体の間を連結する補強部を有することができる。 A prefabricated temporary staircase according to a second invention that meets the above object is a prefabricated temporary staircase installed on a scaffolding at a construction site,
A pair of left and right body frames, a clamp portion rotatably attached to the front side of each body frame and detachably fixed to the support of the scaffold, and one or more detachably attached to each body frame. a handrail and a plurality of footboards detachably attached between the pair of left and right body frames;
Each handrail portion includes a handrail main body arranged in parallel with each main body frame, and a pair of supports whose upper end sides are rotatably connected to one side and the other longitudinal direction of the handrail main body. and a lower end mounting portion provided on the lower end side of each support and having a wedge-shaped projection projecting downward from each support,
Each of the body frames includes an upper side portion, a lower side portion arranged parallel to the upper side portion, one longitudinal end side of which is rotatably connected to an inner portion of the upper side portion, and the other longitudinal end side of which is the lower side portion. a plurality of connecting pieces rotatably connected to the inner part of the ground surface; The tilt angle is variable with respect to
Each of the support mounting portions has one longitudinal end side rotatably connected to the outer side portion of the upper side portion, and the other longitudinal end side rotatably connected to the outer side portion of the lower side portion. A cylindrical support portion is formed in the central portion of the direction to hold the wedge-shaped projection so that it can be inserted and removed,
Each of the footboards has a rectangular footboard main body when viewed from above and a mounting portion provided at the lower center of each short side of the footboard main body,
At the center of each connecting piece in the longitudinal direction, there is formed a tread plate mounting portion for horizontally supporting each tread plate by detachably mounting each of the mounting portions.
In the prefabricated temporary staircase according to the first and second inventions, each of the handrails may have a reinforcing part that connects the pair of supports.

第１、第２の発明に係る組立式仮設階段において、前記補強部は、長手方向の一端側が前記各支持体の長手方向の途中に回動可能に保持された第１、第２のリンク部材と、長手方向の両端部が前記第１、第２のリンク部材の長手方向の他端側に回動可能に連結された連結部材とを有することが好ましい。 In the prefabricated temporary staircase according to the first and second inventions, the reinforcing portion is composed of first and second link members each having one longitudinal end side rotatably held midway in the longitudinal direction of each of the supports. and a connecting member whose longitudinal ends are rotatably connected to the other longitudinal ends of the first and second link members.

第１、第２の発明に係る組立式仮設階段において、前記左右一対の本体フレームの基側に回動可能に保持された接地部を有することが好ましい。 In the prefabricated temporary staircase according to the first and second aspects of the invention, it is preferable to have a grounding portion rotatably held on the base side of the pair of left and right body frames.

第１、第２の発明に係る組立式仮設階段は、クランプ部により、簡単かつ確実に足場と各本体フレームを連結することができ、クランプ部を支柱に固定する際の高さに応じて各本体フレームの傾斜角度を変更することができる。また、踏み板を取外すことにより、左右一対の本体フレームを分離して簡単に搬送及び保管を行うことができる。上辺部と下辺部の平行を保ちながら各連結片を回動させ、上辺部と下辺部を相対的にスライドさせることにより、上辺部と下辺部との間隔を変更することができ、各本体フレームの傾斜角度に関わらず、各連結片が接地面と平行になるようにして、各踏み板を水平に支持することができる。平面視して長方形状の踏み板本体の各短辺の中央下部に設けられた装着部が、連結片の長手方向の中央部に形成された踏み板取付部に着脱可能に装着されるので、踏み板の着脱が容易で、設置安定性にも優れる。 In the prefabricated temporary stairs according to the first and second inventions, the scaffolding and each main frame can be easily and reliably connected by the clamps, and the clamps can be adjusted according to the height when the clamps are fixed to the pillars. The inclination angle of the body frame can be changed. Also, by removing the footboards, the pair of left and right body frames can be separated for easy transportation and storage. By rotating each connecting piece while maintaining the parallelism of the upper side and the lower side and sliding the upper side and the lower side relatively, the interval between the upper side and the lower side can be changed, and each body frame Each footboard can be horizontally supported by making each connecting piece parallel to the ground surface regardless of the inclination angle. Mounting portions provided at lower centers of the short sides of the footboard main body, which is rectangular in plan view, are detachably attached to the footboard mounting portions formed at the longitudinal center of the connecting piece. Easy to put on and take off, and excellent installation stability.

第１の発明に係る組立式仮設階段は、各踏み板が、踏み板本体の下方に突出したくさび形突起部を有し、踏み板取付部が、くさび形突起部が挿抜可能に保持される筒型に形成されているので、踏み板の着脱を極めて簡単に行うことができるだけでなく、踏み板が傾くことがなく安全性にも優れる。 In the prefabricated temporary staircase according to the first invention, each footboard has a wedge-shaped projection projecting downward from the footboard main body, and the footboard mounting portion has a cylindrical shape in which the wedge-shaped projection is removably held. Since it is formed, not only can the footboard be attached and detached extremely easily, but also the footboard does not tilt and is excellent in safety.

第２の発明に係る組立式仮設階段は、各本体フレームに着脱可能に取付けられる１又は複数の手摺り部を有するので、作業者の移動時の安全性に優れる。 The prefabricated temporary staircase according to the second aspect of the invention has one or a plurality of handrails detachably attached to each main body frame, and is therefore excellent in safety during movement of workers.

第２の発明に係る組立式仮設階段は、各手摺り部が、各本体フレームと平行に配置される手摺り本体と、手摺り本体の長手方向の一側及び他側にそれぞれの上端側が回動可能に連結された一対の支持体と、各支持体の下端側にそれぞれ設けられた下端装着部とを有し、各本体フレームが、各下端装着部が着脱可能に装着されて各支持体を垂直に支持する支持体取付部を有するので、手摺り部の着脱が容易で、各本体フレームの傾斜角度に応じて、手摺り本体を各本体フレームと平行に配置することができ、取扱い性に優れる。 A prefabricated temporary staircase according to a second aspect of the invention comprises a handrail body in which each handrail part is arranged in parallel with each body frame, and upper end sides of which are turned to one side and the other side in the longitudinal direction of the handrail body. Each body frame has a pair of movably connected support members and lower end mounting portions provided on the lower end sides of the respective support members. The handrail can be easily attached and detached, and the handrail body can be arranged parallel to each body frame according to the inclination angle of each body frame. Excellent for

第２の発明に係る組立式仮設階段は、各下端装着部が、各支持体の下方に突出したくさび状突起を有し、各支持体取付部が、長手方向の一端側が上辺部の外側部に回動可能に連結され、長手方向の他端側が下辺部の外側部に回動可能に連結されており、長手方向の中央部にくさび状突起が挿抜可能に保持される筒型支持部が形成されているので、手摺り部の着脱を極めて簡単に行うことができるだけでなく、支持体が傾くことなく手摺り本体を所定の位置に保持することができ、安全性に優れる。 In the prefabricated temporary staircase according to the second invention, each lower end mounting portion has a wedge-shaped projection protruding downward from each support, and each support mounting portion has one end side in the longitudinal direction outside the upper side portion. The other end in the longitudinal direction is rotatably connected to the outer portion of the lower side portion, and the cylindrical support portion in which the wedge-shaped projection is removably held at the central portion in the longitudinal direction is provided. Since it is formed, not only can the handrail portion be attached and detached extremely easily, but also the handrail main body can be held at a predetermined position without tilting the support, which is excellent in safety.

第１、第２の発明に係る組立式仮設階段において、各手摺り部が、一対の支持体の間を連結する補強部を有する場合、手摺り部の形態安定性を向上させることができると共に、作業者の落下を効果的に防止することができる。 In the prefabricated temporary stairs according to the first and second aspects of the invention, if each handrail has a reinforcing portion that connects the pair of supports, the shape stability of the handrail can be improved. , can effectively prevent the worker from falling.

第１、第２の発明に係る組立式仮設階段において、補強部が、長手方向の一端側が各支持体の長手方向の途中に回動可能に保持された第１、第２のリンク部材と、長手方向の両端部が第１、第２のリンク部材の長手方向の他端側に回動可能に連結された連結部材とを有する場合、本体フレームの傾斜角度に応じて各支持体の上下方向位置が変化しても、連結部材を回動させて対応することができ、汎用性に優れる。 In the prefabricated temporary staircase according to the first and second inventions, the reinforcing part is first and second link members each having one longitudinal end side rotatably held in the middle of each support in the longitudinal direction; When both ends in the longitudinal direction have connecting members rotatably connected to the other ends in the longitudinal direction of the first and second link members, the vertical direction of each support is adjusted according to the inclination angle of the body frame. Even if the position changes, it can be dealt with by rotating the connecting member, which is excellent in versatility.

第１、第２の発明に係る組立式仮設階段において、左右一対の本体フレームの基側に回動可能に保持された接地部を有する場合、本体フレームの傾斜角度に関わらず、本体フレームの基側を接地部で確実に支持することができ、本体フレームの設置安定性を向上させることができる。 In the prefabricated temporary staircase according to the first and second inventions, in the case where the grounding portion is rotatably held on the base side of the pair of left and right body frames, regardless of the inclination angle of the body frames, The side can be reliably supported by the ground part, and the installation stability of the body frame can be improved.

本発明の第１の実施の形態に係る組立式仮設階段を示す側面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the assembly-type temporary staircase based on the 1st Embodiment of this invention. 同組立式仮設階段の本体フレームに踏み板を装着した状態を示す平面図である。It is a top view which shows the state which mounted|wore the main frame of the assembly-type temporary staircase with the footboard. 同組立式仮設階段の本体フレームに踏み板を装着した状態を示す正面図である。It is a front view which shows the state which mounted|wore the main frame of the assembly-type temporary staircase with the footboard. 図３のＡ－Ａ線断面図である。FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3; 図４のＢ－Ｂ線断面図である。FIG. 5 is a cross-sectional view taken along line BB of FIG. 4; 本発明の第２の実施の形態に係る組立式仮設階段を示す側面図である。It is a side view which shows the assembly-type temporary staircase based on the 2nd Embodiment of this invention.

続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態につき説明し、本発明の理解に供する。
図１～図５に示す本発明の第１の実施の形態に係る組立式仮設階段１０は、建築現場等において、作業者が接地面１１となる地上（地面）と足場との間を移動するために設置されるものである。
図１～図４に示すように、組立式仮設階段１０は、左右一対の本体フレーム１２ａ、１２ｂと、各本体フレーム１２ａ、１２ｂの先側に回動可能に取付けられ足場の支柱１３に着脱可能に固定されるクランプ部１４と、左右一対の本体フレーム１２ａ、１２ｂの間に着脱可能に取付けられる複数（ここでは８個）の踏み板１５とを有している。本体フレーム１２ａ、１２ｂは、正面視して左右対称に対向配置される。
そして、各本体フレーム１２ａ、１２ｂは、角パイプで形成された上辺部１６ａ、１６ｂと、上辺部１６ａ、１６ｂと平行に配置された平板状の下辺部１７ａ、１７ｂと、長手方向の一端側が上辺部１６ａ、１６ｂの内側部に回動可能に連結され長手方向の他端側が下辺部１７ａ、１７ｂの内側部に回動可能に連結された複数の連結片１８とを有している。 Next, specific embodiments of the present invention will be described with reference to the attached drawings for better understanding of the present invention.
The prefabricated temporary staircase 10 according to the first embodiment of the present invention shown in FIGS. It is set up for
As shown in FIGS. 1 to 4, the prefabricated temporary staircase 10 includes a pair of left and right body frames 12a and 12b, and is rotatably attached to the front side of each body frame 12a and 12b and can be attached to and detached from a support pillar 13 of a scaffold. and a plurality of (here, eight) footboards 15 detachably attached between the pair of left and right body frames 12a and 12b. The body frames 12a and 12b are symmetrically opposed to each other when viewed from the front.
Each of the body frames 12a and 12b includes upper side portions 16a and 16b formed of square pipes, flat plate-like lower side portions 17a and 17b arranged parallel to the upper side portions 16a and 16b, and one end in the longitudinal direction of the upper side. It has a plurality of connecting pieces 18 which are rotatably connected to the inner portions of the portions 16a and 16b and whose other longitudinal ends are rotatably connected to the inner portions of the lower side portions 17a and 17b.

連結片１８の長手方向の一端側及び他端側と、上辺部１６ａ、１６ｂの内側部及び下辺部１７ａ、１７ｂの内側部との連結にはボルトとナットによる締結手段１９が好適に用いられる。このとき、連結片１８が上辺部１６ａ、１６ｂ及び下辺部１７ａ、１７ｂに対して、がたつきなく可動（回動）できる程度に締結手段１９を締め付けることが好ましい。各本体フレーム１２ａ、１２ｂは、上辺部１６ａ、１６ｂと下辺部１７ａ、１７ｂの平行を保ちながら各連結片１８を回動させ、上辺部１６ａ、１６ｂと下辺部１７ａ、１７ｂを相対的にスライドさせることにより、上辺部１６ａ、１６ｂと下辺部１７ａ、１７ｂとの間隔を変更することができ、接地面（地面）１１に対して傾斜角度が可変となる（図１、図４参照）。 Fastening means 19 such as bolts and nuts are preferably used for connecting one end side and the other end side in the longitudinal direction of the connecting piece 18 to the inner portions of the upper side portions 16a and 16b and the inner portions of the lower side portions 17a and 17b. At this time, it is preferable to tighten the fastening means 19 to such an extent that the connecting piece 18 can move (rotate) with respect to the upper side portions 16a and 16b and the lower side portions 17a and 17b without rattling. Each body frame 12a, 12b rotates each connecting piece 18 while maintaining parallelism between the upper side portions 16a, 16b and the lower side portions 17a, 17b, and slides the upper side portions 16a, 16b and the lower side portions 17a, 17b relatively. As a result, the distance between the upper side portions 16a, 16b and the lower side portions 17a, 17b can be changed, and the inclination angle with respect to the ground surface (ground) 11 can be varied (see FIGS. 1 and 4).

図２～図４に示すように、各踏み板１５は、平面視して長方形状の踏み板本体２１と、装着部として踏み板本体２１の各短辺の中央から下方に突出したくさび形突起部２５を有している。そして、各連結片１８の長手方向の中央部には、筒型（角筒）に形成され、各くさび形突起部２５が着脱可能に装着（挿抜可能に保持）されて各踏み板１５を水平に支持する踏み板取付部２３が形成されている。
図３、図４に示すように、くさび形突起部２５を踏み板取付部２３に挿通するだけで、簡単に踏み板１５を装着することができ、踏み板１５を介して左右の本体フレーム１２ａ、１２ｂを一体化することができる。 As shown in FIGS. 2 to 4, each footboard 15 includes a footboard body 21 that is rectangular in plan view, and a wedge-shaped protrusion 25 that protrudes downward from the center of each short side of the footboard body 21 as a mounting portion. have. At the center of each connecting piece 18 in the longitudinal direction, a tubular (square tube) is formed, and each wedge-shaped protrusion 25 is detachably attached (retained so as to be insertable and detachable) so that each footboard 15 is leveled. A footboard mounting portion 23 for supporting is formed.
As shown in FIGS. 3 and 4, the footboard 15 can be easily mounted by simply inserting the wedge-shaped protrusion 25 into the footboard mounting portion 23, and the left and right body frames 12a and 12b can be attached via the footboard 15. can be integrated.

先に説明したように、本体フレーム１２ａ、１２ｂを設置する際に、接地面１１に対する傾斜角度は可変であるが、その傾斜角度に関わらず、各連結片１８と接地面１１が平行になるように設定することで、各連結片１８に設けられた踏み板取付部２３で各踏み板１５を水平に支持することができる。
また、踏み板１５の各くさび形突起部２５が、踏み板本体２１の各短辺の中央下部に設けられ、各踏み板取付部２３が、各連結片１８の長手方向の中央部に形成されているので、踏み板１５に荷重が加わっても、踏み板取付部２３（連結片１８）で踏み板１５を安定的に支持することができ、踏み板１５の傾きを確実に防止することができる。なお、各短辺の両端に装着部（くさび形突起部）を形成し、それに対応させて各連結片の両端部に踏み板取付部を形成することもできる。また、装着部と踏み板取付部の形状は本実施の形態に限定されるものではなく、連結片と踏み板を固定できるものであればよい。 As described above, when the body frames 12a and 12b are installed, the inclination angle with respect to the ground surface 11 is variable. , each footboard 15 can be horizontally supported by the footboard mounting portion 23 provided on each connecting piece 18 .
In addition, since the wedge-shaped projections 25 of the footboard 15 are provided at the lower central portions of the short sides of the footboard body 21, and the footboard mounting portions 23 are formed at the central portions of the connecting pieces 18 in the longitudinal direction. Even if a load is applied to the footboard 15, the footboard 15 can be stably supported by the footboard mounting portion 23 (connecting piece 18), and the inclination of the footboard 15 can be reliably prevented. It is also possible to form mounting portions (wedge-shaped protrusions) at both ends of each short side and to form step plate mounting portions at both ends of each connecting piece correspondingly. Further, the shapes of the mounting portion and the footboard mounting portion are not limited to those of the present embodiment, and any shape that can fix the connecting piece and the footboard may be used.

次に、組立式仮設階段１０は、図１に示すように、各本体フレーム１２ａ、１２ｂに着脱可能に取付けられる複数（ここでは２つ）の手摺り部２７を有している。各手摺り部２７は、各本体フレーム１２ａ、１２ｂと平行に配置される手摺り本体２８と、手摺り本体２８の長手方向の一側及び他側にそれぞれの上端側が回動可能に連結された一対の支持体２９ａ、２９ｂと、各支持体２９ａ、２９ｂの下端側にそれぞれ設けられた下端装着部３０とを有している。手摺り本体２８と支持体２９ａ、２９ｂとの連結位置は、いずれもボルトとナットによる締結手段３１で締結されることにより、回動可能となっている。なお、本実施の形態では、手摺り本体２８の長手方向の他側下部に、支持体２９ｂの上端側が選択的に連結される複数（ここでは３つ）の連結孔３３が設けられた支持体連結部３４を形成し、支持体２９ｂの取付位置を可変とした。連結孔の数及び配置は適宜、選択することができるが、必ずしも支持体の取付位置を可変とする必要はなく、連結孔は１つでもよい。 Next, as shown in FIG. 1, the knockdown temporary staircase 10 has a plurality of (here, two) handrails 27 detachably attached to each of the body frames 12a and 12b. Each handrail portion 27 has a handrail main body 28 arranged parallel to each of the body frames 12a and 12b, and upper end sides thereof are rotatably connected to one side and the other longitudinal side of the handrail main body 28. It has a pair of supports 29a and 29b and lower end mounting portions 30 provided on the lower end sides of the respective supports 29a and 29b. The handrail main body 28 and the support members 29a and 29b are connected to each other by fastening means 31, such as bolts and nuts, so that they are rotatable. In the present embodiment, a support body provided with a plurality of (here, three) connection holes 33 to which the upper end side of the support body 29b is selectively connected is provided in the other lower part of the handrail body 28 in the longitudinal direction. A connecting portion 34 is formed to make the mounting position of the support 29b variable. The number and arrangement of the connecting holes can be selected as appropriate, but it is not always necessary to make the mounting position of the support variable, and the number of connecting holes may be one.

また、各本体フレーム１２ａ、１２ｂは、図１～図３に示すように、各下端装着部３０が着脱可能に装着されて各支持体２９ａ、２９ｂを垂直に支持する支持体取付部３５ａ、３５ｂを有している。
ここで、各下端装着部３０は、図１に示すように、各支持体２９ａ、２９ｂの下方に突出したくさび状突起３６を有している。また、各支持体取付部３５ａ、３５ｂは、長手方向の一端側が上辺部１６ａ、１６ｂの外側部に回動可能に連結され、長手方向の他端側が下辺部１７ａ、１７ｂの外側部に回動可能に連結されており、長手方向の中央部にくさび状突起３６が挿抜可能に保持される筒型支持部３７が形成されている。これにより、くさび状突起３６を筒型支持部３７に挿通するだけで、簡単かつ確実に各本体フレーム１２ａ、１２ｂに手摺り部２７を装着することができる。 As shown in FIGS. 1 to 3, each main body frame 12a, 12b has support mounting portions 35a, 35b to which each lower end mounting portion 30 is detachably mounted to vertically support each support 29a, 29b. have.
Here, as shown in FIG. 1, each lower end mounting portion 30 has a wedge-shaped projection 36 protruding downward from each support 29a, 29b. One longitudinal end of each of the support mounting portions 35a, 35b is rotatably connected to the outer side of the upper side 16a, 16b, and the other longitudinal end is rotatably connected to the outer side of the lower side 17a, 17b. A cylindrical support portion 37 is formed in the central portion in the longitudinal direction to hold the wedge-shaped projection 36 in an insertable and removable manner. As a result, the handrail portion 27 can be easily and reliably attached to each of the body frames 12a and 12b simply by inserting the wedge-shaped projection 36 into the cylindrical support portion 37. As shown in FIG.

各支持体取付部３５ａ、３５ｂの長手方向の一端側及び他端側と、上辺部１６ａ、１６ｂの外側部及び下辺部１７ａ、１７ｂの外側部との連結には、前述の連結片１８の場合と同様に、ボルトとナットによる締結手段１９が好適に用いられる。このとき、支持体取付部３５ａ、３５ｂの取付け位置が連結片１８の取付け位置と同じであれば、締結手段１９を共通化することができる。つまり、上辺部１６ａ、１６ｂと下辺部１７ａ、１７ｂを挟んで連結片１８と支持体取付部３５ａ、３５ｂを対向配置し、共通の締結手段１９により連結することができる。そして、各本体フレーム１２ａ、１２ｂにおいて、各連結片１８を回動させ、上辺部１６ａ、１６ｂと下辺部１７ａ、１７ｂをスライドさせて傾斜角度を設定（調整）する際に、各支持体取付部３５ａ、３５ｂも各連結片１８と同様に回動し、接地面１１と平行になる。これにより、各支持体取付部３５ａ、３５ｂの長手方向の中央部に形成された筒型支持部３７で、各支持体２９ａ、２９ｂを垂直に支持することができる。また、手摺り本体２８に対し、支持体２９ａ、２９ｂの上端側が回動可能に連結されているので、本体フレーム１２ａ、１２ｂの傾斜角度が変化しても、手摺り本体２８を本体フレーム１２ａ、１２ｂと平行に設置することができる（図１参照）。
なお、本実施の形態では、図５に示すように、本体フレーム１２ａ、１２ｂの先端部に設けられた支持体取付部３５ａ、３５ｂの他端側にクランプ部１４を取付け、本体フレーム１２ａ、１２ｂの先側で、クランプ部１４が支持体取付部３５ａ、３５ｂと共に回動する構成としたが、クランプ部１４を上辺部１６ａ、１６ｂ又は下辺部１７ａ、１７ｂの先側に直接、回動可能に取付けることもできる。 In the case of the connection piece 18 described above, the connection between one end side and the other end side in the longitudinal direction of each of the support mounting portions 35a and 35b and the outer portions of the upper side portions 16a and 16b and the outer portions of the lower side portions 17a and 17b is As with , bolt and nut fastening means 19 are preferably used. At this time, if the mounting position of the support mounting portions 35a and 35b is the same as the mounting position of the connecting piece 18, the fastening means 19 can be shared. In other words, the connecting piece 18 and the support mounting portions 35a and 35b can be arranged to face each other with the upper side portions 16a and 16b and the lower side portions 17a and 17b interposed therebetween, and can be connected by the common fastening means 19. FIG. When setting (adjusting) the inclination angle by rotating the connecting pieces 18 and sliding the upper side portions 16a and 16b and the lower side portions 17a and 17b of the main body frames 12a and 12b, 35 a and 35 b also rotate in the same manner as each connecting piece 18 and become parallel to the ground plane 11 . As a result, the support members 29a and 29b can be vertically supported by the cylindrical support portion 37 formed in the longitudinal central portion of the support member attachment portions 35a and 35b. Further, since the upper end sides of the supports 29a and 29b are rotatably connected to the handrail main body 28, even if the inclination angles of the main body frames 12a and 12b change, the handrail main body 28 can be adjusted to the main body frames 12a and 12b. 12b (see FIG. 1).
In the present embodiment, as shown in FIG. 5, the clamp portion 14 is attached to the other end side of the support member attachment portions 35a and 35b provided at the tip portions of the body frames 12a and 12b. The clamp part 14 is configured to rotate together with the support mounting parts 35a and 35b on the tip side, but the clamp part 14 can be rotated directly to the tip side of the upper side parts 16a and 16b or the lower side parts 17a and 17b. can also be installed.

また、手摺り部２７は、図１に示すように、一対の支持体２９ａ、２９ｂの間を連結する補強部４２を有している。この補強部４２は、長手方向の一端側が各支持体２９ａ、２９ｂの長手方向の途中に回動可能に保持された第１、第２のリンク部材４３ａ、４３ｂと、長手方向の両端部が第１、第２のリンク部材４３ａ、４３ｂの長手方向の他端側に回動可能に連結された連結部材４４とを有するものである。各支持体２９ａ、２９ｂと第１、第２のリンク部材４３ａ、４３ｂとの連結位置、及び第１、第２のリンク部材４３ａ、４３ｂと連結部材４４との連結位置は、いずれもボルトとナットによる締結手段４５で締結されることにより、回動可能となっている。本体フレーム１２ａ、１２ｂの傾斜角度に応じて支持体２９ａ、２９ｂの上下方向位置が変化しても、第１、第２のリンク部材４３ａ、４３ｂ及び連結部材４４を回動させて対応することができ、手摺り部２７を効果的に補強することができる。 1, the handrail portion 27 has a reinforcing portion 42 that connects the pair of supports 29a and 29b. The reinforcing portion 42 has first and second link members 43a and 43b rotatably held in the middle of the longitudinal direction of the support bodies 29a and 29b at one end in the longitudinal direction, and second link members 43a and 43b at both ends in the longitudinal direction. 1 and a connecting member 44 rotatably connected to the other end side in the longitudinal direction of the second link members 43a and 43b. The connection positions between the support bodies 29a and 29b and the first and second link members 43a and 43b and the connection positions between the first and second link members 43a and 43b and the connection member 44 are bolts and nuts. It is rotatable by being fastened by the fastening means 45 by. Even if the vertical positions of the support bodies 29a and 29b change according to the inclination angles of the body frames 12a and 12b, the first and second link members 43a and 43b and the connecting member 44 can be rotated to cope with the change. , and the handrail portion 27 can be effectively reinforced.

本実施の形態では、第１のリンク部材４３ａの長手方向の他端側に形成した長孔４７を介して第１のリンク部材４３ａと連結部材４４を連結することにより、必要に応じて連結位置を変更可能としたが、必ずしも連結位置を変更可能とする必要はなく、長孔の代りに丸孔としてもよい。また、第１のリンク部材に代えて、若しくは第１のリンク部材に加えて、第２のリンク部材の長手方向の他端側に長孔を形成し、連結部材と連結することもできる。
手摺り部２７（手摺り本体２８）の長さは本体フレーム１２ａ、１２ｂの長さに応じて、適宜、選択することができる。本実施の形態では、本体フレーム１２ａ、１２ｂの長さが長いので、図１に示すように、複数（ここでは２つ）の手摺り部２７を直列に取付けたが、このように複数の手摺り部２７を連結する場合、隣り合う手摺り本体２８の端部をそれぞれ連結管４８の両端に挿通し、固定ボルト４９で固定して連結することにより、手摺り部２７（手摺り本体２８）を安定的に支持することができる。本実施の形態では、一方の手摺り本体２８と連結管４８の一端側のみを固定ボルト４９で固定したが、双方の手摺り本体と連結管の両端側を固定ボルトで固定してもよい。なお、本体フレームの長さと手摺り部（手摺り本体）の長さとの関係により、手摺り部を１つとしてもよいし、３つ以上としてもよい。 In the present embodiment, the first link member 43a and the connecting member 44 are connected through a long hole 47 formed at the other end in the longitudinal direction of the first link member 43a, so that the connecting position can be changed as necessary. is changeable, but it is not always necessary to change the connection position, and a round hole may be used instead of the long hole. Further, instead of the first link member or in addition to the first link member, a long hole may be formed at the other longitudinal end side of the second link member and connected to the connecting member.
The length of the handrail portion 27 (handrail body 28) can be appropriately selected according to the length of the body frames 12a and 12b. In this embodiment, since the body frames 12a and 12b are long, a plurality of (here, two) handrails 27 are attached in series as shown in FIG. When connecting the handrail portions 27, the end portions of the adjacent handrail main bodies 28 are inserted into both ends of the connecting pipes 48, and fixed with fixing bolts 49 to connect the handrail portions 27 (handrail main bodies 28). can be stably supported. In this embodiment, only one end of the handrail main body 28 and the connecting pipe 48 is fixed with the fixing bolt 49, but both handrail main bodies and both ends of the connecting pipe may be fixed with fixing bolts. Depending on the relationship between the length of the body frame and the length of the handrail portion (handrail body), the number of handrail portions may be one, or three or more.

次に、組立式仮設階段１０は、図１～図４に示すように、左右一対の本体フレーム１２ａ、１２ｂの基側に回動可能に保持された平板状の接地部５０を有している。これにより、本体フレーム１２ａ、１２ｂの傾斜角度に関わらず、本体フレーム１２ａ、１２ｂの基側を接地部５０で確実に支持することができる。なお、本実施の形態では、接地部５０を上辺部１６ａ、１６ｂの基側に回動可能に取付けたが、下辺部１７ａ、１７ｂの基側に回動可能に取付けることもできる。
また、本実施の形態では、図１～図３に示すように、上辺部１６ａ、１６ｂの長手方向の途中に把手部５１を設けた。これにより、踏み板１５及び手摺り部２７を取外した後、本体フレーム１２ａ、１２ｂを容易に持ち運ぶことができる。なお、把手部の数及び配置は適宜、選択することができる。 Next, as shown in FIGS. 1 to 4, the assembly type temporary staircase 10 has a flat plate-like grounding portion 50 rotatably held on the base side of the pair of left and right body frames 12a and 12b. . As a result, regardless of the inclination angles of the body frames 12a and 12b, the base sides of the body frames 12a and 12b can be reliably supported by the ground portion 50. As shown in FIG. In this embodiment, the grounding portion 50 is rotatably attached to the base side of the upper side portions 16a and 16b, but it may be rotatably attached to the base side of the lower side portions 17a and 17b.
Further, in the present embodiment, as shown in FIGS. 1 to 3, a handle portion 51 is provided in the middle of the longitudinal direction of the upper side portions 16a and 16b. Accordingly, after removing the footboard 15 and the handrail portion 27, the body frames 12a and 12b can be easily carried. Note that the number and arrangement of the handle portions can be selected as appropriate.

続いて、本発明の第２の実施の形態に係る組立式仮設階段５２について説明する。なお、第１の実施の形態と同様の構成については、同一の符号を付して説明を省略する。
図６の組立式仮設階段５２が組立式仮設階段１０と異なる点は、全長が短く、踏み板１５の数が少なくなっている（ここでは４個）点と、接地面１１に対する傾斜角度が小さく（緩やかに）なっている点である。また、組立式仮設階段５２の全長に合わせて手摺り部２７も１つになっている。そして、第１、第２のリンク部材４３ａ、４３ｂ及び連結部材４４を回動させて、支持体２９ａ、２９ｂの間隔と高さを調整することにより、支持体２９ａ、２９ｂを垂直に支持し、手摺り本体２８を本体フレーム１２ｂと平行に設置することができる。 Next, a knockdown temporary staircase 52 according to a second embodiment of the present invention will be described. It should be noted that the same reference numerals are given to the same configurations as in the first embodiment, and the description thereof will be omitted.
The assembly type temporary staircase 52 of FIG. 6 differs from the assembly type temporary staircase 10 in that the overall length is short, the number of footboards 15 is reduced (here, four), and the inclination angle with respect to the ground surface 11 is small ( It is the point that it is gradually). Moreover, the handrail part 27 is also one in accordance with the total length of the assembly type temporary staircase 52.例文帳に追加By rotating the first and second link members 43a and 43b and the connecting member 44 to adjust the spacing and height of the supports 29a and 29b, the supports 29a and 29b are vertically supported, The handrail body 28 can be installed parallel to the body frame 12b.

足場の高さに応じて、全長の異なる組立式仮設階段１０又は組立式仮設階段５２を選択して使用することができる。また、組立式仮設階段１０及び組立式仮設階段５２のいずれも、足場の高さに合わせてクランプ部１４の固定位置（高さ）を変更し、接地面１１に対す傾斜角度を変更することができる。 Depending on the height of the scaffolding, it is possible to select and use prefabricated temporary stairs 10 or prefabricated temporary stairs 52 with different overall lengths. In both the prefabricated temporary staircase 10 and the prefabricated temporary staircase 52, the fixing position (height) of the clamp part 14 can be changed according to the height of the scaffolding, and the inclination angle with respect to the ground surface 11 can be changed. can.

以上、本発明の実施の形態を説明したが、本発明は何ら上記した実施の形態に記載の構成に限定されるものではなく、特許請求の範囲に記載されている事項の範囲内で考えられるその他の実施の形態や変形例も含むものである。
例えば、本体フレームの長さは適宜、選択することができ、それに応じて、踏み板の数、寸法（長辺と短辺の長さ）、及び配置間隔は適宜、選択することができる。また、前記実施の形態では、本体フレームの上辺部を角パイプで形成し、下辺部を平板状に形成したが、これに限定されるものではない。例えば上辺部を断面コの字型のチャンネル鋼で形成してもよいし、下辺部を角パイプ又はチャンネル鋼で形成してもよい。
また、図面上、踏み板本体を平板状に記載したが、搬送性、取扱い性を考慮して軽量化を図ることが好ましく、エキスパンドメタル等で網状に形成されたもの又はパンチングメタル等で多孔状に形成されたもの等が好適に用いられる。
補強部は手摺り部を補強できるものであればよく、その構造は、適宜、選択することができる。
上記実施の形態では、クランプ部を縦支柱に固定したが、クランプ部を９０度回転させて水平（横）支柱に固定することもできる。 Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations described in the above embodiments, and can be considered within the scope of the matters described in the claims. Other embodiments and modifications are also included.
For example, the length of the body frame can be selected as appropriate, and the number, dimensions (long side and short side lengths), and arrangement intervals of the footboards can be selected as appropriate. Further, in the above-described embodiment, the upper side of the body frame is formed of a rectangular pipe and the lower side of the body frame is formed in a flat plate shape, but the present invention is not limited to this. For example, the upper side may be formed of channel steel having a U-shaped cross section, and the lower side may be formed of a square pipe or channel steel.
In addition, although the tread plate body is shown in the drawing as a flat plate, it is preferable to reduce the weight in consideration of transportability and handling. A formed one or the like is preferably used.
The reinforcing portion may be of any type as long as it can reinforce the handrail portion, and its structure can be appropriately selected.
In the above embodiment, the clamp section is fixed to the vertical support, but it is also possible to rotate the clamp section by 90 degrees and fix it to the horizontal (horizontal) support.

１０：組立式仮設階段、１１：接地面（地面）、１２ａ、１２ｂ：本体フレーム、１３：支柱、１４：クランプ部、１５：踏み板、１６ａ、１６ｂ：上辺部、１７ａ、１７ｂ：下辺部、１８：連結片、１９：締結手段、２１：踏み板本体、２３：踏み板取付部、２５：くさび形突起部、２７：手摺り部、２８：手摺り本体、２９ａ、２９ｂ：支持体、３０：下端装着部、３１：締結手段、３３：連結孔、３４：支持体連結部、３５ａ、３５ｂ：支持体取付部、３６：くさび状突起、３７：筒型支持部、４２：補強部、４３ａ、４３ｂ：第１、第２のリンク部材、４４：連結部材、４５：締結手段、４７：長孔、４８：連結管、４９：固定ボルト、５０：接地部、５１：把手部、５２：組立式仮設階段 10: prefabricated temporary staircase, 11: ground surface (ground), 12a, 12b: body frame, 13: strut, 14: clamp, 15: footboard, 16a, 16b: upper side, 17a, 17b: lower side, 18 : Connecting piece 19: Fastening means 21: Footboard body 23: Footboard attachment part 25: Wedge-shaped protrusion 27: Handrail part 28: Handrail body 29a, 29b: Support body 30: Lower end attachment Part 31: Fastening Means 33: Connecting Hole 34: Support Connecting Portion 35a, 35b: Support Mounting Portion 36: Wedge-shaped Projection 37: Cylindrical Support Portion 42: Reinforcing Portion 43a, 43b: First and second link members 44: Connecting member 45: Fastening means 47: Long hole 48: Connecting pipe 49: Fixing bolt 50: Grounding portion 51: Handle portion 52: Prefabricated temporary staircase

Claims

A prefabricated temporary staircase installed on a scaffolding at a construction site,
A pair of left and right body frames, a clamp part rotatably attached to the front side of each body frame and detachably fixed to the support of the scaffold, and a detachable attachment between the pair of left and right body frames a plurality of treads;
Each of the body frames includes an upper side portion, a lower side portion arranged parallel to the upper side portion, one longitudinal end side of which is rotatably connected to an inner portion of the upper side portion, and the other longitudinal end side of which is the lower side portion. having a plurality of connecting pieces rotatably connected to the inner part of the and having a variable inclination angle with respect to the ground surface,
Each of the footboards has a footboard body that is rectangular in plan view, and a wedge-shaped protrusion that is provided at the lower center of each short side of the footboard body and protrudes downward from the footboard body ,
A tread plate mounting portion is formed in the longitudinal center of each of the connecting pieces, and is formed in a cylindrical shape and retains each of the wedge-shaped protrusions so as to be insertable and removable, thereby horizontally supporting each of the tread plates. A prefabricated temporary staircase.

2. The knockdown temporary staircase according to claim 1 , comprising one or a plurality of handrails detachably attached to each of said body frames.

3. The prefabricated temporary staircase according to claim 2 , wherein each of said handrail parts comprises a handrail body arranged parallel to each of said body frames, and a handrail body on one side and the other side in the longitudinal direction of said handrail body, respectively. Each body frame has a pair of support bodies whose upper end sides are rotatably connected, and lower end mounting parts provided at the lower end sides of the respective support bodies, and each of the lower end mounting parts is detachable from each of the main body frames. 1. A prefabricated temporary staircase, characterized in that it has a supporting body attachment part that is mounted on the staircase and vertically supports each of the supporting bodies.

4. The prefabricated temporary staircase according to claim 3 , wherein each of said lower end mounting portions has a wedge-shaped projection protruding downward from each of said supports, and said each of said support mounting portions has said one end side in the longitudinal direction thereof. It is rotatably connected to the outer side of the upper side, the other end in the longitudinal direction is rotatably connected to the outer side of the lower side, and the wedge-shaped projection is removably held at the central part in the longitudinal direction. A prefabricated temporary staircase characterized by the fact that a cylindrical support part is formed to hold the staircase.

A prefabricated temporary staircase installed on a scaffolding at a construction site,
A pair of left and right body frames, a clamp portion rotatably attached to the front side of each body frame and detachably fixed to the support of the scaffold, and one or more detachably attached to each body frame. a handrail and a plurality of footboards detachably attached between the pair of left and right body frames;
Each handrail portion includes a handrail main body arranged in parallel with each main body frame, and a pair of supports whose upper end sides are rotatably connected to one side and the other longitudinal direction of the handrail main body. and a lower end mounting portion provided on the lower end side of each support and having a wedge-shaped projection projecting downward from each support,
Each of the body frames includes an upper side portion, a lower side portion arranged parallel to the upper side portion, one longitudinal end side of which is rotatably connected to an inner portion of the upper side portion, and the other longitudinal end side of which is the lower side portion. a plurality of connecting pieces rotatably connected to the inner part of the ground surface; The tilt angle is variable with respect to
Each of the support mounting portions has one longitudinal end side rotatably connected to the outer side portion of the upper side portion, and the other longitudinal end side rotatably connected to the outer side portion of the lower side portion. A cylindrical support portion is formed in the central portion of the direction to hold the wedge-shaped projection so that it can be inserted and removed,
Each of the footboards has a rectangular footboard main body when viewed from above and a mounting portion provided at the lower center of each short side of the footboard main body,
A prefabricated temporary staircase, wherein each connecting piece is detachably mounted at a central portion thereof in a longitudinal direction thereof, and a tread plate mounting portion for horizontally supporting each tread plate is formed.

6. The knockdown temporary staircase according to any one of claims 3 to 5 , wherein each of said handrails has a reinforcing part connecting between said pair of supports.

7. The prefabricated temporary staircase according to claim 6, wherein the reinforcing portion includes first and second link members each having one longitudinal end side rotatably held midway in the longitudinal direction of each of the supports; A prefabricated temporary staircase, characterized by comprising connecting members rotatably connected to the other longitudinal ends of said first and second link members at both longitudinal ends thereof.

8. The knockdown temporary staircase according to any one of claims 1 to 7, further comprising grounding portions rotatably held on base sides of said pair of left and right body frames.