JP3867235B2

JP3867235B2 - Scaffolding board

Info

Publication number: JP3867235B2
Application number: JP36555597A
Authority: JP
Inventors: 隆道飛騨
Original assignee: Toshiba Plant Systems and Services Corp
Current assignee: Toshiba Plant Systems and Services Corp
Priority date: 1997-12-22
Filing date: 1997-12-22
Publication date: 2007-01-10
Anticipated expiration: 2017-12-22
Also published as: JPH11182025A

Description

【０００１】
【発明の属する技術分野】
本発明は、直線状の長尺な足場のみならず、大型発電機などの平面円形機器の据付作業等の足場に用いる足場板の改良に関するものである。
【０００２】
【従来の技術】
一般に、前記の作業用の足場板は、桁間距離１．８メートル程度、許容荷重２５０キログラム重（約２５００ニュートン）程度を目安にして製作され、用いられている。足場平面の設置高度は５メートル程度のことも多く、階層構造にされる場合もある。
その足場板は、従来、細長い足場平面を有する足場板本体と、その長手方向の端に、幅方向に離間して配置された夫々一対の内側爪と外側爪（以下、内側爪の二つ、外側爪の二つを夫々一対と呼ぶ）とで構成されている。この足場板は、専用組立枠または単管（パイプ）組立枠で構成された足場枠の横架材に前記の爪を係止されて、作業用足場が形成される。
すなわち一つの足場板は、一端にある一組の爪（以下、前記長手方向の一端にある内側爪と外側爪の二つを一組と呼ぶ）が第一の横架材に係止され、他端の一組の爪が第二の横架材に係止されるようにして、平行な二つの横架材に載置される。
【０００３】
ｎ個の足場板による長手方向に長尺の足場は、引き続き二つ目の足場板の一端にある一組の爪が第二の横架材に係止され、他端の一組が第三の横架材に係止されるようにして、以下同様にそれが繰り返され、（ｎ＋１）個の平行な等間隔の横架材に足場板が載置されて組立てが完成する。
一般に、これら足場板および足場本体の機材は、企業ごとに所要最大規模の数量があらかじめ製作・保管されていて、必要に応じて所要個数を取り出して使用される。
【０００４】
【発明が解決しようとする課題】
しかし、従来の足場板には、たとえば、平面が円形の機器の回りに多角形の足場を組むには不都合があった。一組の爪の係止中心点を結ぶ直線が他端のそれと平行であるために、図９の如く、足場板の載置には平行に配置された二つの横架材を要したからである。したがって前記一つの足場板だけの足場を一単位として、これを周方向に多角形に配列し、さらに安全上、隣接枠を連結して用いられた。すなわち、ｎ個の足場板について２ｎ個の横架材を必要とするに留まらず、足場枠の機材全体では、長手方向の長尺足場に比べて足場面積あたり２倍以上の数量を要し、組立作業も２倍以上の時間を要する不経済性があった。
この不経済性を回避するために、図９の如く、円形機器の回りに放射方向に等間隔で横架材を配置することにすれば、足場板を特製する必要があった。しかし、対象製品ごとに足場の直径は変わり、横架材の放射方向の配置角度も変わるために、特製した足場板を再利用できる可能性は低く、その保管や管理にも費用を要することもあって、特製足場は廃却処分にせざるを得ない実状にあった。
【０００５】
さらに、廃却処分される費用を軽減するために、特製の足場板は木製化される傾向があった。この場合、足場板を横架材に針金で固定する等の作業に時間を要する割に足場板としての耐荷重強度や固定の信頼性、針金の不定形な出張りなど、安全上、懸念される問題も内在していた。
このように、従来の足場技術では、円形機器の回りに足場を組むには如何にしても不経済性がつきまとい、安全性の確保にも問題が波及することが懸念されるなど、抜本的な解決策が強く望まれていた。
そこで本発明は、従来から用いられてきた足場枠の機材をそのまま活用することができ、かつ長手方向に長尺の足場のみならず、円形の、しかも直径が違う足場にも共通に活用でき、さらに安全上、信頼性の高い足場板を提供することを課題とするものである。
【０００６】
【課題を解決するための手段】
前記課題を解決するための請求項１に記載の発明は、長方形状の足場板本体２と、この足場板本体(2) の長手方向端部の各々の中央に枢着部材 (41)(41) によって回動自在に取着された一対の補助板 (40)(40) と、
前記各々の補助板 (40)(40) の端部両側に設けられた一対の爪 (3)(3)(3)(3) を具備し、前記一対の補助板 (40)(40) の各々の回動方向は互いに独立した方向に回動自在であることを特徴とする足場板である。
上記のように構成された足場板は、足場板本体２の両側に一対の補助板４０が、その中央で枢着部材４１により枢着され且つ、互いに独立していずれの方向にも回動自在であるから、横架材６，６が平行に配置される長尺足場のみならず、平行でなく且つ、平面方向へ波状等の曲折足場や多角形の足場にも、足場の共通機材として活用することができる。
【０００７】
請求項２に記載の発明は、前記足場板本体(2) が、一対の端部板 (2b)(2b) に分割され、前記一対の端部板 (2b)(2b) は断面矩形筒状の中央部板 (2a) により伸縮自在に結合されていることを特徴とする請求項１記載の足場板である。この足場によれば、横架材６，６間の長さが異なり且つ、それらが平行でなくとも同一の足場を取り付けることができ、汎用性の高い足場となる。
【０００８】
請求項３に記載の発明は、前記一対の爪 (3)(3)(3)(3) が各々伸縮自在のアーム (45)(45)(45)(45) に取着されていることを特徴とする請求項１記載の足場板である。
この足場板によれば、一対の爪３，３のうち一方が他方に対して相対的に、長手方向に移動することができるから、横架材６，６間の長さが異なり且つ、それらが平行でなくとも各爪３を各横架材６に係止して足場板を固定することができ、汎用性の高い足場となる。
【０００９】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
図１は本発明の足場板１の一例を示す平面図であり、図２はその側面図であり、図３は図１におけるＡ−Ａ線断面図であって移動手段４の一例を示すものである。また図４は図１のＩＶ部拡大図、図５はその側面図である。また図６はその使用状態を示す平面図、図８は本発明の足場板１を用いたときの多角形の足場枠５の平面図を示す。図９は従来の足場板を用いたときの多角形の足場枠５の平面図である。
図１に示す本発明の足場板１は、細長い足場平面２ａを有する足場板本体２と、その足場板本体２の長手方向の端に、幅方向に離間して夫々配置された係止用の一組の内側爪３ａおよび外側爪３ｂと、その内側爪３ａと外側爪３ｂとの少なくとも何れか一方と足場板本体２との間に設けられ、その一方の爪が他方に対して相対的に前記長手方向に移動するように構成された移動手段４Ａとを備えている。
【００１０】
図１の移動手段４Ａは、前記端に内側爪３ａと外側爪３ｂとが設けられた補助板４０と、該補助板４０を足場板本体２の長手方向の端で足場平面２ａに直交する軸心の回りに回動自在に枢着させているピン４１とによって構成されている。また補助板４０は、軸心方向への移動が許されないように、足場板本体２によって遊挟されている。
なお、この例では足場板本体２が、夫々断面矩形筒状の中央部板２ａとそれに摺動自在な端部板２ｂとよりなり、その足場板本体２の全長を伸縮自在に構成し、適宜長さに調整した後に、側部に設けられた楔機構７によりその長さを固定できるように構成されている。そして、その端部板２ｂに前記補助板４０がピン４１により枢着されている。また好ましくは、補助板４０の使用時の回動防止機構、例えば図３に示す如く、補助板４０の表面にピン４１の軸心回りに設けられたＶ溝と、足場板本体２に螺着された棒先ボルトとによる押しネジ機構等が備えられる。
【００１１】
次に、図７は本発明の足場板の移動手段４の他の例を示し、その移動手段４Ｂは、足場板本体２の長手方向の端において該長手方向の１自由度のみが許されるように足場板本体２に係合され、かつ一端に爪３が設けられたアーム４５と、その他端で軸心を合わせて螺合され、軸心回りの１自由度のみが許されるように足場板本体２に係合された伸縮ボルト４６と、該ボルトのストッパ４７とによって構成されている。
なお、上記の移動手段４Ｂは内側爪３ａと外側爪３ｂとの少なくとも何れか一方に設けられるものである。この場合、前記長手方向に配置された一対の爪の移動手段４は、図示は省略されているが、ターンバックル方式で連動するように構成することも可能である。なお上記の何れの移動手段４においても、組立時の爪の干渉を防ぐために、移動手段４の有無に拘らず、前記長手方向の端に配置される幅方向に一組の爪は、常に一定の離間距離Ｌを保ちつつ、たとえば右の一端では内側爪３ａ側に左の一端では外側爪３ｂ側に、すなわち時計回りに偏心して配置される。
【００１２】
次に、作用について説明する。
図６に示す如く、移動手段４Ａにおいては、足場板本体２の長手方向の端で、軸心が足場平面に直交するように設けられたピン４１に補助板４０が回動自在に枢着され、該補助板４０に内側爪３ａと外側爪３ｂとからなる一組の爪が設けられた。
かくして補助板４０の回動により、該一組の爪の一方は他方に対して相対的に、前記長手方向に移動することができる。したがって本足場板１Ａは、該一組の爪の夫々係止中心点を結ぶ直線と他端のそれとが交叉する角度φを、任意の値に設定できる機能を備えている。
【００１３】
次に、半径Ｒの円形機器の回りに該足場板１Ａを用いて足場を組む場合に、上記補助板４０の設定角度θと、横架材６の配置角度φとが夫々一義的に定まり、容易に算出し得ることを以下に説明する。
ここでは足場板本体２が該長手方向中央で円形機器に接するように配置することとし、一端の補助板４０の設定角度θは、その正規位置からの回転角度で表すこととする。また、足場板１Ａの諸元寸法は、足場板本体２の長手方向には、その中央からピン４１までの距離をｐ、爪までの距離をｔ、幅方向には、足場板本体２の幅を２ｕとし、ピン４１がその幅方向の中央（機能上は端も良い）にあるものとする。このとき前記θおよびφは、次の２次方程式を解くことによって求めることができる。
【００１４】
【数１】
ａｘ²＋２ｂｘ＋ｃ =０
ただし、ここで
ａ＝ (Ｒ＋ｕ）²＋（ｔ−ｐ) ²
ｂ＝−ｐ（Ｒ＋ｕ）
ｃ＝−ｔ（ｔ＋２ｐ）
ｘ＝ sinθ
θ＝ sin^-1ｘ
よって両端に補助板４０があれば
φ＝２θ
である。
【００１５】
以上のように、該足場板１Ａの諸元寸法が確定していれば、補助板４０の設定角度θと横架材６の配置角度φは、円形機器の半径Ｒの関数として容易に算出することができる。かくして本発明によれば、従来の足場板を用いる限り避けられなかった図９に示すような足場枠５の枠組の不経済性を解消し、直線状の長尺足場はもちろん、図４に示すように合理的な足場枠５の枠組による曲折足場や多角形足場にも、共通機材として活用可能な足場板１Ａを提供することができる。
【００１６】
また、図７の移動手段４を備えた足場板１Ｂにおいては、足場板本体２の長手方向の端において、該長手方向に伸縮自在にアーム４５が設けられ、そのアーム４５の先端に前記爪３が設けられた。このように構成された移動手段４Ｂが、内側爪３ａと外側爪３ｂとの少なくとも何れか一方の一対に設けられる。
かくして伸縮ボルト４６の回転により、該一組の爪の一方は他方に対して相対的に、前記長手方向に移動することができる。したがって該足場板１Ｂは、該一組の爪３の夫々係止中心点を結ぶ直線と他端のそれとが交叉する角度φを、任意の値に設定できる機能を備えている。
【００１７】
次に、半径Ｒの円形機器の回りに該足場板１Ｂを用いて足場を組む場合に、爪の伸縮量λと、横架材６の配置角度φとを適宜、容易に求め得ることを説明する。
ここでは足場板本体２が該長手方向中央で円形機器に接するように配置することとし、一対の外側爪３ｂだけが移動手段４Ｂを備えているとする。また、足場板１Ｂの諸元寸法は、足場板本体２の長手方向の中央から内側爪３ａまでの距離をｔ、幅方向には、足場板本体２の幅を２ｕ、一組の爪３の離間距離を２ｗとし、幅方向に対称に振り分けられているとする。このとき前記λとφは次式によって求めることができる。
【００１８】
【数２】
λ＝２ｗｔ／（Ｒ＋ｕ−ｗ）
tan(φ／２）＝ｔ／（Ｒ＋ｕ−ｗ）
∴ φ＝２ tan^-1（ｔ／（Ｒ＋ｕ−ｗ))
【００１９】
以上のように、該足場板１Ｂの諸元寸法が確定していれば、爪３ｂの設定伸縮量λと横架材６の配置角度φは、円形機器の半径Ｒの関数として容易に算出することができる。
移動手段４Ｂが一対の外側爪３ｂだけに採用された足場板１Ｂの機能は、前記の足場板１Ａの機能と基本的に同等である。しかし、内側爪３ａにも設けられた場合には、本発明に固有の働きが生まれる。それは、横架材６の配置に誤差がある場合に、２対、合計４個のどの爪についても最適な係止状態が得られるように微調整ができる点である。
【００２０】
専用組立枠においては横架材６は正確に配置されるため、この微調機能を要しない。しかし、本発明が特に狙いとする曲折足場や多角形足場では専用枠を保有するケースは希で、単管（パイプ）による組立枠が足場枠５として常用されている。この場合には、その特性上、あるいは現場作業の性格上、多少の誤差は不可避的に伴うものである。しかも確実な係止は、安全上、必須の課題である。この意味から、爪３の位置の微調整ができることは実用上、非常に重要である。
かくして本発明によれば、従来の足場板を用いる限り避けられなかった図９に示す足場枠５の枠組や特製足場板の廃却処分による不経済性を解消し、直線状の長尺足場はもちろん、図８に示すような合理的な足場枠５の枠組による曲折足場や多角形足場にも、共通機材として活用可能な足場板１Ｂを提供することができる。
【００２１】
【発明の効果】
以上述べたように、請求項１に記載の発明によれば、足場板本体２の両側に一対の補助板４０が、その中央で枢着部材４１により枢着され且つ、互いに独立していずれの方向にも回動自在であるから、横架材６，６が平行に配置される長尺足場のみならず、平行でなく且つ、平面方向へ波状等に曲折された曲折足場や多角形の足場にも、足場の共通機材として活用することができる。
【００２２】
また請求項２に記載の発明によれば、横架材６，６間の長さが異なり且つ、それらが平行でなくとも同一の足場を取り付けることができ、汎用性の高い足場となる。
請求項３に記載の発明によれば、一対の爪３，３のうち一方が他方に対して相対的に、長手方向に移動することができるから、横架材６，６間の長さが異なり且つ、それらが平行でなくとも各爪３を各横架材６に係止して足場板を固定することができ、汎用性の高い足場となる。
【図面の簡単な説明】
【図１】本発明の足場板の一例を示す平面図。
【図２】同側面図。
【図３】図１のＡ−Ａ断面略図。
【図４】図１のＩＶ部拡大断面図。
【図５】同側面図。
【図６】同足場板の使用状態を示す平面図。
【図７】本足場板の移動装置４の他の例を示す断面図。
【図８】本発明の足場板を用いたときの多角形足場枠の平面図。
【図９】従来の足場板を用いたときの多角形足場枠の平面図。
【符号の説明】
１足場板
１Ａ足場板
１Ｂ足場板
２足場板本体
２ａ足場平面
２ｂ端部板
３爪
３ａ内側爪
３ｂ外側爪
４移動手段
４Ａ移動手段
４Ｂ移動手段
５足場枠
６横架材
７楔機構
４０補助板
４１ピン
４５アーム
４６伸縮ボルト
４７ストッパ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a scaffold plate used not only for a linear and long scaffold but also for a scaffold for installation of a planar circular device such as a large generator.
[0002]
[Prior art]
Generally, the above-mentioned scaffolding plate for work is manufactured and used with a distance between girders of about 1.8 meters and an allowable load of about 250 kilograms (about 2500 Newtons). The installation height of the scaffold plane is often about 5 meters, and there are cases where it is made into a hierarchical structure.
The scaffold plate has conventionally been a scaffold plate body having an elongated scaffold plane, and a pair of inner and outer nails (hereinafter referred to as two inner claws, respectively) disposed at the longitudinal ends of the scaffold plate body and spaced apart in the width direction. Two of the outer claws are each called a pair). In this scaffold plate, the above-mentioned claws are locked to a horizontal frame of a scaffold frame constituted by a dedicated assembly frame or a single pipe (pipe) assembly frame, thereby forming a working scaffold.
That is, one scaffolding plate has a pair of claws at one end (hereinafter referred to as a pair of inner and outer claws at one end in the longitudinal direction) locked to the first horizontal member, A pair of claws at the other end are placed on two parallel horizontal members so that the second horizontal member is locked.
[0003]
In the scaffold that is long in the longitudinal direction by n scaffold plates, one set of claws at one end of the second scaffold plate is locked to the second horizontal member, and the other set of third plates is the third This is repeated in the same manner as described above, and the scaffolding plates are placed on (n + 1) parallel equidistant horizontal members to complete the assembly.
In general, the scaffolding board and the scaffolding main body are manufactured and stored in advance in the required maximum scale for each company, and the required number is taken out and used as necessary.
[0004]
[Problems to be solved by the invention]
However, the conventional scaffold plate is inconvenient for assembling a polygonal scaffold around a device having a circular plane. Because the straight line connecting the locking center points of the pair of claws is parallel to that of the other end, as shown in FIG. 9, two horizontal members arranged in parallel were required for placing the scaffolding plate. is there. Therefore, the scaffold of only one scaffold plate is used as a unit, and this is arranged in a polygonal shape in the circumferential direction, and for safety, the adjacent frames are connected. That is, not only 2n horizontal members are required for n scaffold plates, but the entire scaffold frame equipment requires more than twice the amount of the scaffold in the longitudinal direction, The assembly work was also uneconomical, requiring more than twice the time.
In order to avoid this uneconomical property, as shown in FIG. 9, if the horizontal members are arranged at equal intervals in the radial direction around the circular device, it is necessary to make a special scaffold plate. However, the diameter of the scaffolding varies depending on the target product, and the radial arrangement angle of the horizontal member also changes.Therefore, it is unlikely that the special scaffolding plate can be reused, and its storage and management may be expensive. Therefore, the special scaffolding had to be disposed of.
[0005]
In addition, special scaffold boards tended to be made of wood to reduce the cost of disposal. In this case, there are concerns about safety, such as the load bearing strength as a scaffolding plate, reliability of fixing, and the irregular shape of the wire, although it takes time to fix the scaffolding plate to the horizontal member with a wire. The problem was also inherent.
In this way, with the conventional scaffolding technology, it is uneconomical to assemble a scaffolding around a circular device, and there is a concern that problems may spread to ensuring safety. A solution was highly desired.
Therefore, the present invention can utilize the scaffold frame equipment that has been used conventionally as it is, and can be used not only for scaffolds that are long in the longitudinal direction but also for scaffolds that are circular and have different diameters. It is another object of the present invention to provide a highly reliable scaffold board for safety.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 for solving the above problems, a rectangular scaffolding plate main body 2, the longitudinal ends each center pivoted member (41) (41 of the scaffolding plate body (2) pair of auxiliary plate is attached rotatably by) and (40) (40),
Each of the auxiliary plates (40) (40) includes a pair of claws (3), (3), (3), and (3) provided on both ends of the end portions of the pair of auxiliary plates (40), (40) . Each of the pivoting directions is a scaffold plate characterized by being pivotable in directions independent of each other .
In the scaffolding plate configured as described above, a pair of auxiliary plates 40 are pivotally attached to both sides of the scaffolding plate body 2 by a pivoting member 41 at the center, and can be rotated in any direction independently of each other. since it is not only the long scaffold horizontal members 6,6 are arranged in parallel, parallel rather than and, in folding scaffolding or polygonal scaffold wave like the planar direction, as a common equipment of the scaffold Can be used.
[0007]
According to a second aspect of the present invention, the scaffold plate body (2) is divided into a pair of end plates (2b) (2b) , and the pair of end plates (2b) (2b) has a rectangular cylindrical shape in cross section. The scaffolding plate according to claim 1, wherein the scaffolding plate is stretchably coupled by a central plate (2a) . According to this scaffold, the length between the horizontal members 6 and 6 is different, and even if they are not parallel, the same scaffold can be attached, so that a highly versatile scaffold is obtained.
[0008]
According to a third aspect of the present invention, the pair of claws (3), (3), (3), and (3) are attached to the extendable arms (45), (45), (45), and (45) , respectively. The scaffold plate according to claim 1.
According to this scaffold plate, one of the pair of claws 3 and 3 can move in the longitudinal direction relative to the other, so the length between the horizontal members 6 and 6 is different, and Even if they are not parallel, each claw 3 can be locked to each horizontal member 6 to fix the scaffolding plate, and a highly versatile scaffolding can be obtained.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing an example of a scaffold plate 1 of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a sectional view taken along line AA in FIG. It is. 4 is an enlarged view of a portion IV in FIG. 1, and FIG. 5 is a side view thereof. FIG. 6 is a plan view showing the state of use, and FIG. 8 is a plan view of the polygonal scaffold frame 5 when the scaffold plate 1 of the present invention is used. FIG. 9 is a plan view of a polygonal scaffold frame 5 when a conventional scaffold plate is used.
The scaffold board 1 of the present invention shown in FIG. 1 is a scaffold board body 2 having an elongated scaffold plane 2a, and a locking plate disposed at the longitudinal end of the scaffold board body 2 so as to be spaced apart from each other in the width direction. A pair of inner claw 3a and outer claw 3b, and at least one of the inner claw 3a and outer claw 3b are provided between the scaffold plate body 2 and the one claw is relatively relative to the other. Moving means 4A configured to move in the longitudinal direction.
[0010]
The moving means 4A in FIG. 1 includes an auxiliary plate 40 having an inner claw 3a and an outer claw 3b provided at the ends, and an axis perpendicular to the scaffold plane 2a at the longitudinal end of the scaffold plate body 2. And a pin 41 pivotally mounted around the heart. The auxiliary plate 40 is loosely sandwiched between the scaffold plate main bodies 2 so that movement in the axial direction is not allowed.
In this example, the scaffolding plate body 2 is composed of a central plate 2a having a rectangular cross section in cross section and an end plate 2b slidable thereto, and the entire length of the scaffolding plate body 2 is configured to be freely stretchable. After the length is adjusted, the length can be fixed by the wedge mechanism 7 provided on the side portion. The auxiliary plate 40 is pivotally attached to the end plate 2b by a pin 41. Preferably, the auxiliary plate 40 is prevented from rotating when it is used, for example, as shown in FIG. 3, the auxiliary plate 40 is screwed to the scaffold plate main body 2 with a V-groove provided around the axis of the pin 41 on the surface. A push screw mechanism or the like is provided.
[0011]
Next, FIG. 7 shows another example of the moving means 4 of the scaffolding plate according to the present invention, and the moving means 4B allows only one degree of freedom in the longitudinal direction at the longitudinal end of the scaffolding plate body 2. The scaffold plate is engaged with the arm plate 45 engaged with the scaffold plate body 2 and provided with a claw 3 at one end thereof, and is screwed with the other end at the same axis so that only one degree of freedom around the axis is allowed. It is comprised by the expansion-contraction bolt 46 engaged with the main body 2, and the stopper 47 of this bolt.
The moving means 4B is provided on at least one of the inner claw 3a and the outer claw 3b. In this case, the pair of claw moving means 4 arranged in the longitudinal direction is not shown, but can be configured to be interlocked by a turnbuckle method. In any of the moving means 4 described above, in order to prevent interference of the claws during assembly, a set of claws in the width direction arranged at the end in the longitudinal direction is always constant regardless of the presence or absence of the moving means 4. For example, the right end is arranged on the inner claw 3a side and the left end is arranged on the outer claw 3b side, that is, eccentrically in the clockwise direction.
[0012]
Next, the operation will be described.
As shown in FIG. 6, in the moving means 4A, the auxiliary plate 40 is pivotally attached to a pin 41 provided at the longitudinal end of the scaffold plate body 2 so that the axis is orthogonal to the scaffold plane. The auxiliary plate 40 was provided with a pair of claws comprising an inner claw 3a and an outer claw 3b.
Thus, by turning the auxiliary plate 40, one of the pair of claws can move in the longitudinal direction relative to the other. Accordingly, the scaffold plate 1A has a function of setting the angle φ at which the straight line connecting the respective locking center points of the pair of claws intersects that of the other end to an arbitrary value.
[0013]
Next, when a scaffold is assembled using the scaffold plate 1A around a circular device having a radius R, the set angle θ of the auxiliary plate 40 and the arrangement angle φ of the horizontal member 6 are uniquely determined, What can be easily calculated will be described below.
Here, it is assumed that the scaffold plate body 2 is arranged so as to contact the circular device at the center in the longitudinal direction, and the set angle θ of the auxiliary plate 40 at one end is represented by a rotation angle from the normal position. The dimensions of the scaffold plate 1A are as follows: in the longitudinal direction of the scaffold plate body 2, the distance from the center to the pin 41 is p, the distance to the nail is t, and the width of the scaffold plate body 2 is in the width direction. 2u, and the pin 41 is at the center in the width direction (in terms of function, the end may be good). At this time, θ and φ can be obtained by solving the following quadratic equation.
[0014]
[Expression 1]
ax ² + 2bx + c = 0
However, here
a = (R + u) ² + (tp) ²
b = −p (R + u)
c = -t (t + 2p)
x = sinθ
θ = sin ^-1 x
Therefore, if there is an auxiliary plate 40 at both ends
φ = 2θ
It is.
[0015]
As described above, if the specification dimensions of the scaffold plate 1A are determined, the setting angle θ of the auxiliary plate 40 and the arrangement angle φ of the horizontal member 6 can be easily calculated as a function of the radius R of the circular device. be able to. Thus, according to the present invention, the uneconomical effect of the framework of the scaffold frame 5 as shown in FIG. 9 which is inevitable as long as the conventional scaffold plate is used is eliminated, and the linear long scaffold is shown in FIG. Thus, it is possible to provide a scaffolding plate 1A that can be used as a common equipment for bent scaffolds and polygonal scaffolds based on the framework of the rational scaffold frame 5 as described above.
[0016]
Further, in the scaffolding plate 1B provided with the moving means 4 of FIG. 7, an arm 45 is provided at the longitudinal end of the scaffolding plate body 2 so as to be stretchable in the longitudinal direction, and the claw 3 is provided at the distal end of the arm 45. Was provided. The moving means 4B configured as described above is provided in at least one pair of the inner claw 3a and the outer claw 3b.
Thus, by rotation of the telescopic bolt 46, one of the pair of claws can move in the longitudinal direction relative to the other. Therefore, the scaffold plate 1B has a function of setting an angle φ at which the straight line connecting the locking center points of the pair of claws 3 and that of the other end intersect each other to an arbitrary value.
[0017]
Next, it will be described that when the scaffold is assembled around the circular device having the radius R using the scaffold plate 1B, the expansion / contraction amount λ of the nail and the arrangement angle φ of the horizontal member 6 can be easily obtained as appropriate. To do.
Here, it is assumed that the scaffold plate body 2 is arranged so as to contact the circular device at the center in the longitudinal direction, and only the pair of outer claws 3b are provided with the moving means 4B. Also, feature dimensions of the scaffolding plate 1B is the distance from the longitudinal center of the scaffolding plate body 2 to the inner claw 3a t, the width direction, the width of the scaffolding board body 2 2u, a set of claws 3 It is assumed that the separation distance is 2 w and the distribution is performed symmetrically in the width direction. At this time, λ and φ can be obtained by the following equations.
[0018]
[Expression 2]
λ = 2 wt / (R + u−w)
tan (φ / 2) = t / (R + u−w)
∴ φ = 2 tan ^-1 (t / (R + u-w))
[0019]
As described above, if the dimensions of the scaffold plate 1B are determined, the set expansion / contraction amount λ of the claw 3b and the arrangement angle φ of the horizontal member 6 are easily calculated as a function of the radius R of the circular device. be able to.
The function of the scaffold plate 1B in which the moving means 4B is employed only for the pair of outer claws 3b is basically the same as the function of the scaffold plate 1A. However, when it is also provided on the inner claw 3a, a function unique to the present invention is born. That is, when there is an error in the arrangement of the horizontal member 6, fine adjustment can be performed so that an optimal locking state can be obtained for any of the two pairs and a total of four claws.
[0020]
In the dedicated assembly frame, since the horizontal member 6 is accurately arranged, this fine adjustment function is not required. However, a bent scaffold or a polygonal scaffold that is particularly aimed at by the present invention rarely has a dedicated frame, and an assembly frame using a single pipe (pipe) is commonly used as the scaffold frame 5. In this case, some errors are unavoidable due to the characteristics or the nature of field work. Moreover, reliable locking is an essential issue for safety. In this sense, the ability to finely adjust the position of the claw 3 is very important in practice.
Thus, according to the present invention, it is possible to eliminate the uneconomical effect caused by the disposal of the framework of the scaffold frame 5 and the special scaffold plate shown in FIG. 9 as long as the conventional scaffold plate is used. Of course, it is possible to provide a scaffolding plate 1B that can be used as a common equipment for bent scaffolds and polygonal scaffolds with a rational scaffolding frame 5 as shown in FIG.
[0021]
【The invention's effect】
As described above, according to the invention described in claim 1, the pair of auxiliary plates 40 are pivotally attached to the both sides of the scaffold plate body 2 by the pivoting member 41 at the center thereof, and any one of them independently of each other. Because it is also rotatable in the direction, it is not only a long scaffold in which the horizontal members 6 and 6 are arranged in parallel, but also a folded scaffold or a polygonal scaffold that is not parallel and is bent in a wavy shape in the plane direction. In addition, it can be used as common equipment for scaffolding.
[0022]
According to the invention described in claim 2, and different lengths between the horizontal members 6,6, even they are not parallel can be attached to the same scaffold, a versatile scaffolds.
According to the third aspect of the present invention, since one of the pair of claws 3 and 3 can move in the longitudinal direction relative to the other, the length between the horizontal members 6 and 6 is Even if they are not parallel to each other, the scaffolding plates can be fixed by locking the claws 3 to the horizontal members 6 to provide a highly versatile scaffolding .
[Brief description of the drawings]
FIG. 1 is a plan view showing an example of a scaffold plate of the present invention.
FIG. 2 is a side view of the same.
3 is a schematic cross-sectional view taken along the line AA in FIG.
FIG. 4 is an enlarged cross-sectional view of a part IV in FIG.
FIG. 5 is a side view of the same.
FIG. 6 is a plan view showing a usage state of the scaffold board.
FIG. 7 is a sectional view showing another example of the moving device 4 for the present scaffold board.
FIG. 8 is a plan view of a polygonal scaffold frame when the scaffold plate of the present invention is used.
FIG. 9 is a plan view of a polygonal scaffold frame when a conventional scaffold plate is used.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Scaffold plate 1A Scaffold plate 1B Scaffold plate 2 Scaffold plate body 2a Scaffold plane 2b End plate 3 Claw 3a Inner claw 3b Outer claw 4 Moving means 4A Moving means 4B Moving means 5 Scaffolding frame 6 Horizontal member 7 Wedge mechanism 40 Auxiliary plate 41 pin 45 arm 46 telescopic bolt 47 stopper

Claims

A rectangular scaffolding plate body (2), a pair of auxiliary plate which is attached rotatably by a pivotally mounted member (41) (41) in the center of each of the longitudinal ends of the scaffolding plate body (2) (40) (40) and a pair of claws (3) (3) (3) (3) provided on both sides of the end of each of the auxiliary plates (40) (40) , the pair of auxiliary plates A scaffold plate characterized in that the rotation directions of the plates (40) and (40) are rotatable in directions independent of each other .

The scaffold plate body (2) is divided into a pair of end plates (2b) and (2b) , and the pair of end plates (2b) and (2b) are expanded and contracted by a central plate (2a) having a rectangular cross section. The scaffold board according to claim 1, wherein the scaffold board is freely coupled .

The pair of claws (3) (3) (3) (3) are respectively attached to telescopic arms (45) (45) (45) (45) . Scaffolding board.