JP3558992B2

JP3558992B2 - Connection of steel pipe scaffold

Info

Publication number: JP3558992B2
Application number: JP2001070397A
Authority: JP
Inventors: 純一石瀬; 信二吉田; 保実菊地; 博之横山; 純二稲森
Original assignee: 住友金属建材株式会社
Priority date: 2001-03-13
Filing date: 2001-03-13
Publication date: 2004-08-25
Anticipated expiration: 2021-03-13
Also published as: JP2002276152A

Description

【０００１】
【発明の属する技術分野】
この発明は、建設工事などで仮設足場として使用される鋼管足場の建地と布地および腕木との連結部に関する。
【０００２】
【従来の技術】
建設工事などで作業床や通路などとして広く使用される仮設足場としては、例えば図５（ａ）に図示するような鋼管足場が一般に知られている。
【０００３】
この種の鋼管足場においては、建地３０が所定間隔おきに建て付けられ、この建地３０，３０間に布地３１と腕木３２が複数段にそれぞれ架け渡され、そして腕木３２，３２間に布板３３が架け渡されている。
【０００４】
建地３０、布地３１および腕木３２には足場用鋼管が使用され、また布地３１と腕木３２の端部は建地３０にクランプ等の専用の緊結金具によって連結されている他、当出願人が開発した、例えば図５（ｂ）に図示するような連結金具によって連結されている。
【０００５】
図５（ｂ）に図示する連結方法においては、連結金具として建地３０の側部に受け金具３３が、布地３１と腕木３２の端部に係合金具３４がそれぞれ突設され、また受け金具３３には縦に貫通するくさび孔３３ａが形成され、係合金具３４にはくさび孔３３ａに挿入可能なくさび３４ａが真下に向かって突設されている。
【０００６】
そして、布地３１と腕木３２の端部はそれぞれ、くさび孔３３ａにくさび３４ａを差し込まれることで建地３０に連結されている。
【０００７】
【発明が解決しようとする課題】
しかし、クランプ等の緊結金具による方式は、ボルトの締め付け等があって作業が面倒なだけでなく、作業中に誤って緊結金具を地上に落としてしまうおそれがあるために安全面で課題があるだけでなく、落とした緊結金具の回収という煩わしさがあった。
【０００８】
また、当出願人が開発した、図５（ｂ）に図示する連結方法は、ボルトの締め付け等の煩わしい作業はなく、差し込み方式により建地３０と布地３１との連結および切り離しを簡単に行うことができるものの、組み立て後に足場の揺れや振動などによってくさび孔３３ａとくさび３４ａとによるクサビ効果がゆるみ、くさび３４ａがくさび孔３３ａから抜けるおそれがあり、安全上大きな課題があった。
【０００９】
この発明は以上の課題を解決するためになされたもので、特に建地と布地および腕木との連結および切り離しを簡単に行うことができて、しかも連結後の揺れや振動などによる連結部の外れる事故を未然に防止できるようにした鋼管足場の連結部を提供することを課題とする。
【００１０】
【課題を解決するための手段】
請求項１記載の鋼管足場の連結部は、建地の側部に上下方向に貫通するくさび孔を有する受け金具が、布地の端部に前記くさび孔に挿入されるくさび部を有する係合金具がそれぞれ突設され、前記くさび部は断面略溝状に形成され、当該くさび部の下端部に、前記受け金具の下側で前記くさび部の外側にばねの力で突出する抜止めストッパーが取り付けられ、当該抜止めストッパーは前記くさび部内に回転自在に軸支して収納され、かつ他端側に形成された逆くの字状をなす当接部がばねの力によってくさび部の外側に常時突出するようになっていることを特徴とするものである。
【００１１】
請求項２記載の鋼管足場の連結部は、建地の側部に上下方向に貫通するくさび孔を有する受け金具が、腕木の端部に前記くさび孔に挿入されるくさび部を有する係合金具がそれぞれ突設され、前記くさび部は断面略溝状に形成され、当該くさび部の下端部に、前記受け金具の下側で前記くさび部の外側にばねの力で突出する抜止めストッパーが取り付けられ、当該抜止めストッパーは前記くさび部内に回転自在に軸支して収納され、かつ他端側に形成された逆くの字状をなす当接部がばねの力によってくさび部の外側に常時突出するようになっていることを特徴とするものである。
【００１２】
請求項３記載の鋼管足場の連結部は、請求項１または２記載の鋼管足場の連結部において、抜止めストッパーは、一端側にくの字状をなす当接部を、他端側に逆くの字状をなす当接部をそれぞれ有し、かつ中央部分に突設されたフランジ部を貫通する水平ピンによってくさび部内の下端部に回転自在に軸支して収納されてなることを特徴とするものである。
【００１３】
【発明の実施の形態】
図１〜図４は、鋼管足場とその建地と布地との連結部、および建地と腕木との連結部の一例をそれぞれ示し、図において所定間隔おきに建地１が建て付けられ、この建地１，１間に布地２と腕木３が同じ高さで複数段にそれぞれ架け渡され、さらに各腕木３，３間に布板４がそれぞれ架け渡されている。
【００１４】
建地１、布地２および腕木３には足場用鋼管が使用され、布板４には鋼製布板が使用されている。また、建地１の側部と布地２および腕木３の端部には、連結金具として受け金具５と係合金具６がそれぞれ突設されている。
【００１５】
受け金具５は建地１の軸方向に所定間隔おきに、かつ一カ所につき二個ないし四個が直角二方向ないし直角四方向に水平に突設されている。
【００１６】
各受け金具５にはそれぞれ、平面矩形状のくさび孔５ａが上下方向に貫通して形成されている。くさび孔５ａは上端部の内径が一番大きく、下方向に徐々に小径となるように形成されている。
【００１７】
一方、係合金具６には下方に突出するくさび部６ａが突設されている。くさび部６ａはくさび孔５ａの形状に対応する形状の断面略溝形状に形成され、かつ上端部の外径が一番大きく、下方向に徐々に小径となるように形成されている。
【００１８】
また、くさび部６ａはくさび孔５ａに上から挿入された際に、下端部がくさび孔５ａの下方に所定長さ突出するようにくさび孔５ａの深さより長く形成されている。
【００１９】
さらに、くさび部６ａの建地１と当接する側には、建地１の側面形状（凸曲面状をなしている）に対応して、凹溝状部６ｂが上下方向に連続して形成されており、このため、くさび部６ａがくさび孔５ａに挿入された際に凹溝状部６ｂが建地１の側面部に係合することで、連結部の安定性が図られている。
【００２０】
なお、くさび部６ａの建地１と当接する側に凹溝状部６ｂが形成されていることに伴い、くさび部６ａの内側には凸状部６ｃが上下方向に連続して形成されている。
【００２１】
このように形成されたくさび部６ａの下端部に、くさび部６ａがくさび孔５ａに上から挿入された状態で受け金具５の下側に、ばねの力で突出する抜止めストッパー７が取り付けられている。
【００２２】
抜止めストッパー７は、断面略溝形状をなすくさび部６ａ内に収納でき、かつ一端側をくさび部６ａ内の凸状部６ｃに当接させた状態で斜めに傾けるにつれて他端側がくさび部６ａの外側に徐々に突出するような外径と長さを有する板状に形成されている。
【００２３】
また、抜止めストッパー７の一端側にくの字状をなす当接部７ａが、他端側に逆くの字状をなす当接部７ｂがそれぞれ形成され、さらに左右両側のほぼ中央部分にはフランジ部７ｃがそれぞれ突設され、フランジ部７ｃにはピン孔７ｄがそれぞれ形成されている。
【００２４】
こうして形成された抜止めストッパー７は、くさび部６ａ内の下端部にピン孔７ｄ，７ｄをそれぞれ貫通し、かつ両端がくさび部６ａの左右フランジ部６ｄ，６ｄにそれぞれ軸支された水平ピン８によって回転自在に取り付けられている。
【００２５】
また、くさび部６ａ内の凸状部６ｃと抜止めストッパー７との間に板ばね９が取り付けられている。板ばね９は水平ピン８の側面形状（凸曲面状）に沿ってくの字状に形成され、かつその一端側がくさび部６ａ内の凸状部６ｃに、他端側が抜止めストッパー７の裏側にそれぞれ当接した状態に取り付けられている。
【００２６】
板ばね９がこのように取り付けられていることで、抜止めストッパー７の他端側、すなわち当接部７ｂは板ばね９の力によって一定量、常にくさび部６ａの外側に突出している。また、当接部７ｂは強く押し付けることでくさび部６ａ内に簡単に収納される。
【００２７】
したがって、図４（ａ）に図示するように、抜止めストッパー７の当接部７ｂがくさび部６ａの外側に突出していても、くさび部６ａを受け金具５のくさび孔５ａに上から挿入するだけで、図４（ｂ）に図示するように当接部７ｂはくさび孔５ａを通る際に強く押し付けられて一時的にくさび部６ａ内に収納されるので、建地１の側部に布地２と腕木３の端部をそれぞれきわめて簡単に連結することができる。
【００２８】
また、図４（ｃ）に図示するように、くさび部６ａがくさび孔５ａに挿入された状態で、抜止めストッパー７の当接部７ｂがくさび部６ａの外側に板ばね９の力で突出している限り、くさび部６ａがくさび孔５ａから抜けるような状態に至ったとしても、抜止めストッパー７の当接部７ｂが受け金具５の下端部に当たることで、くさび部６ａがくさび孔５ａから誤って抜けるようなことはない。
【００２９】
また、図４（ｂ）に図示するように、当接部７ｂは強く押し付けられることでくさび部６ａ内に簡単に収納されることから、当接部７ｂを強く押し付けてくさび部６ａ内に収納した状態で、くさび部６ａを受け金具５のくさび孔５ａから上に抜くだけで、建地１の側部から布地２と腕木３の端部をそれぞれきわめて簡単に外すことができる。
【００３０】
【発明の効果】
この発明は以上説明した通りであり、建地の側部に縦に貫通するくさび孔を有する受け金具が、布地および腕木の端部に前記くさび孔に挿入されるくさび部を有する係合金具がそれぞれ突設され、かつ前記くさび部が前記くさび孔に挿入された状態で、受け金具の下側にばねの力で突出する抜止めストッパーが取り付けられているので、鋼管足場の組み立て後に足場の揺れや振動などでくさび孔とくさび部とによるクサビ効果が緩んだとしても、抜止めストッパーが受け金具の下端部に当たることでくさび部がくさび孔から抜けるおそれはなく、安全性にきわめてすぐれている。
【００３１】
また、建地と布地および腕木との連結および切り離しをきわめて簡単に行うことができる。
【図面の簡単な説明】
【図１】鋼管足場の一例を示し、（ａ）はその一部斜視図、（ｂ）は建地と布地との連結部を示す図（ａ）におけるイ部分解斜視図である。
【図２】建地と布地との連結部を示し、（ａ）は連結された状態を示す側面図、（ｂ）は縦断面図である。
【図３】抜止めストッパーの取付状態を示し、（ａ）は抜止めストッパーの下端部の縦断面図、（ｂ）は（ａ）におけるロ−ロ線断面図である。
【図４】建地と布地との連結部を示し、（ａ）〜（ｃ）は動作を示す断面図である。
【図５】鋼管足場の一例を示し、（ａ）はその一部斜視図、（ｂ）は従来の建地と布地との連結部を示す図（ａ）におけるイ部分解斜視図である。
【符号の説明】
１建地
２布地
３腕木
４布板
５受け金具
５ａくさび孔
６係合金具
６ａくさび部
６ｂ凹溝状部
６ｃ凸状部
６ｄフランジ部
７抜止めストッパー
７ａ当接部
７ｂ当接部
７ｃフランジ部
７ｄピン孔
８水平ピン
９板ばね[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a joint between a steel pipe scaffold, a fabric, and a brace used as a temporary scaffold in construction work or the like.
[0002]
[Prior art]
As a temporary scaffold widely used as a work floor or a passage in construction work or the like, for example, a steel pipe scaffold as shown in FIG. 5A is generally known.
[0003]
In this type of steel pipe scaffold, a building 30 is built at predetermined intervals, a fabric 31 and a brace 32 are spanned between the buildings 30 and 30 in a plurality of steps, and a fabric is placed between the brace 32 and 32. A plate 33 is bridged.
[0004]
A steel pipe for scaffolding is used for the building 30, the fabric 31, and the arm 32. The ends of the fabric 31 and the arm 32 are connected to the building 30 by a dedicated tie-down fitting such as a clamp. The connection is made by a connection fitting developed as shown in FIG. 5B, for example.
[0005]
In the connection method illustrated in FIG. 5B, a receiving fitting 33 is provided on a side of the building 30 as a connecting fitting, and an engaging fitting 34 is protruded from ends of the cloth 31 and the arm 32, respectively. A wedge hole 33a penetrating vertically is formed in 33, and a wedge 34a that can be inserted into the wedge hole 33a is protruded from directly below the engagement fitting 34.
[0006]
The ends of the cloth 31 and the arms 32 are connected to the building 30 by inserting wedges 34a into wedge holes 33a.
[0007]
[Problems to be solved by the invention]
However, the method using a clamp such as a clamp has a problem in terms of safety because the work is troublesome due to the tightening of bolts and the like, and there is a possibility that the fastener may be accidentally dropped on the ground during the work. In addition, there was the trouble of collecting dropped bindings.
[0008]
Further, the connection method illustrated in FIG. 5B developed by the present applicant does not involve any troublesome work such as bolt tightening, and simply connects and disconnects the building 30 and the fabric 31 by an insertion method. However, the wedge hole 33a and the wedge 34a loosen the wedge effect due to shaking or vibration of the scaffold after assembling, and the wedge 34a may come off from the wedge hole 33a.
[0009]
The present invention has been made in order to solve the above-mentioned problems, and in particular, it is possible to easily connect and disconnect the building and the fabric and the armature, and furthermore, the connecting portion is disconnected due to shaking or vibration after the connection. An object of the present invention is to provide a connecting portion of a steel pipe scaffold capable of preventing an accident beforehand.
[0010]
[Means for Solving the Problems]
The connecting part of the steel pipe scaffold according to claim 1, wherein the receiving metal part having a wedge hole penetrating vertically in a side part of the building has a wedge part inserted into the wedge hole at an end of the fabric. The wedge portion is formed in a substantially groove shape in cross section, and a retaining stopper that projects with the force of a spring to the outside of the wedge portion below the receiving bracket is attached to a lower end portion of the wedge portion. The retaining stopper is rotatably supported and housed in the wedge portion, and an inverted abutting portion formed on the other end side is always outside the wedge portion by the force of a spring. It is characterized in that it protrudes.
[0011]
3. The connecting part of the steel pipe scaffold according to claim 2, wherein the receiving metal part having a wedge hole penetrating vertically in a side part of the building has a wedge part inserted into the wedge hole at an end of the arm tree. The wedge portion is formed in a substantially groove shape in cross section, and a retaining stopper that projects with the force of a spring to the outside of the wedge portion below the receiving bracket is attached to a lower end portion of the wedge portion. The retaining stopper is rotatably supported and housed in the wedge portion, and an inverted abutting portion formed on the other end side is always outside the wedge portion by the force of a spring. It is characterized in that it protrudes.
[0012]
The connecting part of the steel pipe scaffold according to claim 3 is the connecting part of the steel pipe scaffold according to claim 1 or 2, wherein the retaining stopper is configured such that an abutting part having a U-shape at one end is inverted to the other end. It is characterized in that it has a U-shaped contact portion, and is rotatably supported at the lower end portion of the wedge portion by a horizontal pin penetrating a flange portion protruding from the center portion and stored. It is assumed that.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 1 to 4 show an example of a connecting portion between a steel pipe scaffold, its building and a fabric, and a connecting portion between a building and a brace, respectively. In the drawings, a building 1 is built at predetermined intervals. The fabric 2 and the arm 3 are laid over a plurality of steps at the same height between the buildings 1 and 1, and the cloth plate 4 is laid between the arms 3 and 3, respectively.
[0014]
A steel pipe for scaffolding is used for the building 1, the cloth 2, and the arm 3 and a steel cloth plate is used for the cloth plate 4. At the side of the building 1 and at the ends of the cloth 2 and the arm 3, a receiving fitting 5 and an engaging fitting 6 are provided as connecting fittings, respectively.
[0015]
The receiving fittings 5 are provided at predetermined intervals in the axial direction of the building 1, and two or four receiving fittings 5 are projected horizontally at two right angles or four right angles at one location.
[0016]
Each of the receiving fittings 5 is formed with a planar rectangular wedge hole 5a penetrating vertically. The wedge hole 5a is formed so that the inner diameter at the upper end is the largest and gradually decreases downward.
[0017]
On the other hand, the engagement fitting 6 is provided with a wedge 6a projecting downward. The wedge portion 6a is formed in a substantially groove shape in cross section having a shape corresponding to the shape of the wedge hole 5a, and is formed so that the outer diameter of the upper end portion is the largest and gradually becomes smaller in the downward direction.
[0018]
The wedge portion 6a is formed to be longer than the depth of the wedge hole 5a such that the lower end portion projects below the wedge hole 5a by a predetermined length when inserted into the wedge hole 5a from above.
[0019]
Further, on the side of the wedge portion 6a that comes into contact with the building 1, a groove-shaped portion 6b is formed continuously in the vertical direction corresponding to the side surface shape (having a convex curved shape) of the building 1. Therefore, when the wedge portion 6a is inserted into the wedge hole 5a, the concave groove portion 6b engages with the side surface portion of the building 1, thereby stabilizing the connection portion.
[0020]
With the formation of the concave groove portion 6b on the side of the wedge portion 6a that comes into contact with the building 1, a convex portion 6c is continuously formed in the vertical direction inside the wedge portion 6a. .
[0021]
At the lower end of the wedge portion 6a formed in this way, a retaining stopper 7 that is protruded by the force of a spring is attached to the lower side of the receiving fitting 5 with the wedge portion 6a inserted into the wedge hole 5a from above. ing.
[0022]
The retaining stopper 7 can be housed in the wedge portion 6a having a substantially groove shape in cross section, and the other end side is wedge portion 6a as it is slanted in a state where one end side is in contact with the convex portion 6c in the wedge portion 6a. It is formed in a plate shape having an outer diameter and a length that gradually protrudes to the outside.
[0023]
Also, a contact portion 7a having a U-shape is formed at one end of the stopper 7 and an abutment portion 7b having a reverse shape is formed at the other end. Each has a flange portion 7c protruding therefrom, and a pin hole 7d is formed in each of the flange portions 7c.
[0024]
The retaining stopper 7 formed in this way penetrates through the pin holes 7d, 7d at the lower end inside the wedge 6a, and has horizontal pins 8 whose both ends are respectively supported by the left and right flanges 6d, 6d of the wedge 6a. It is attached so that it can rotate freely.
[0025]
A leaf spring 9 is mounted between the convex portion 6c in the wedge portion 6a and the retaining stopper 7. The leaf spring 9 is formed in a V shape along the side surface shape (convex curved surface shape) of the horizontal pin 8, and one end of the leaf spring 9 is provided on the convex portion 6 c in the wedge portion 6 a, and the other end is provided on the back side of the stopper 7. Each is attached in a contact state.
[0026]
With the leaf spring 9 attached in this way, the other end of the stopper 7, that is, the contact portion 7 b, always projects outside the wedge portion 6 a by a fixed amount by the force of the leaf spring 9. Further, the contact portion 7b is easily housed in the wedge portion 6a by pressing strongly.
[0027]
Therefore, as shown in FIG. 4A, even if the contact portion 7b of the stopper 7 protrudes outside the wedge portion 6a, the wedge portion 6a is inserted into the wedge hole 5a of the metal fitting 5 from above. Only as shown in FIG. 4B, the contact portion 7b is strongly pressed when passing through the wedge hole 5a and is temporarily stored in the wedge portion 6a. The ends of the arm 2 and the arm 3 can be connected very easily.
[0028]
Further, as shown in FIG. 4C, in a state where the wedge portion 6a is inserted into the wedge hole 5a, the contact portion 7b of the stopper 7 protrudes outside the wedge portion 6a by the force of the leaf spring 9. As long as the wedge portion 6a comes out of the wedge hole 5a, the contact portion 7b of the stopper 7 comes into contact with the lower end portion of the receiving fitting 5, so that the wedge portion 6a moves from the wedge hole 5a. There is no accidental exit.
[0029]
Further, as shown in FIG. 4 (b), since the contact portion 7b is easily stored in the wedge portion 6a by being strongly pressed, the contact portion 7b is strongly pressed to be stored in the wedge portion 6a. In this state, the end of the cloth 2 and the end of the arm 3 can be very easily removed from the side of the building 1 simply by pulling the wedge 6a upward from the wedge hole 5a of the metal fitting 5.
[0030]
【The invention's effect】
The present invention is as described above, and a receiving metal fitting having a wedge hole vertically penetrating on a side of a building is provided with an engaging metal fitting having a wedge part to be inserted into the wedge hole at an end portion of the cloth and the arm. Each of the projections and the wedge portion are inserted into the wedge holes, and a retaining stopper that is protruded by a spring force is attached to the lower side of the receiving bracket, so that the scaffold swings after the steel pipe scaffold is assembled. Even if the wedge effect due to the wedge hole and the wedge portion is loosened due to vibrations or the like, the wedge portion does not fall out of the wedge hole when the retaining stopper hits the lower end portion of the receiving bracket, and the safety is extremely excellent.
[0031]
Also, the connection and disconnection of the building with the cloth and the arm can be performed very easily.
[Brief description of the drawings]
FIG. 1 shows an example of a steel pipe scaffold, (a) is a partial perspective view thereof, and (b) is an exploded perspective view of a part (a) in a view (a) showing a connecting portion between a building and a fabric.
2A and 2B show a connecting portion between a building and a fabric, wherein FIG. 2A is a side view showing a connected state, and FIG. 2B is a longitudinal sectional view.
FIGS. 3A and 3B show a mounting state of the stopper; FIG. 3A is a longitudinal sectional view of a lower end portion of the stopper; FIG.
FIGS. 4A to 4C are cross-sectional views showing a connecting portion between a building and a fabric, showing an operation.
5A and 5B show an example of a steel pipe scaffold, wherein FIG. 5A is a partial perspective view of the scaffold, and FIG. 5B is an exploded perspective view of a portion a in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Building 2 Fabric 3 Arm 4 Cloth board 5 Receiving bracket 5a Wedge hole 6 Engaging bracket 6a Wedge section 6b Concave groove section 6c Convex section 6d Flange section 7 Stop stopper 7a Contact section 7b Contact section 7c Flange section 7d pin hole 8 horizontal pin 9 leaf spring

Claims

A receiving fitting having a wedge hole penetrating vertically in a side portion of the building, an engaging fitting having a wedge portion inserted into the wedge hole is protruded at an end of the cloth, and the wedge portion has a substantially cross-sectional shape. At the lower end of the wedge portion, a retaining stopper is attached to the lower end of the wedge portion and protrudes outside the wedge portion below the receiving bracket by a spring force, and the retaining stopper rotates inside the wedge portion. The abutting portion, which is rotatably supported and accommodated and formed on the other end side, is formed so as to always protrude outside the wedge portion by the force of a spring. Joint of steel pipe scaffold.

A receiving fitting having a wedge hole penetrating vertically in a side portion of the building, an engaging fitting having a wedge portion inserted into the wedge hole is protruded at an end of the arm tree, and the wedge portion has a substantially cross-sectional shape. At the lower end of the wedge portion, a retaining stopper is attached to the lower end of the wedge portion, which protrudes outside the wedge portion below the receiving bracket by a spring force, and the retaining stopper rotates inside the wedge portion. The contact portion, which is rotatably supported and accommodated and has an inverted letter shape formed on the other end side, always projects outside the wedge portion by the force of a spring. Joint of steel pipe scaffold.

The stopper has a U-shaped contact part at one end and an inverted U-shaped contact part at the other end, and penetrates a flange protruding from the center. The connecting portion of a steel pipe scaffold according to claim 1 or 2, wherein the connecting portion is rotatably supported and stored at a lower end portion in the wedge portion by a horizontal pin .