JP7256354B2 - Shape-retaining structure of steel pipe ends and stacking method of steel pipes - Google Patents

Shape-retaining structure of steel pipe ends and stacking method of steel pipes Download PDF

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JP7256354B2
JP7256354B2 JP2018168731A JP2018168731A JP7256354B2 JP 7256354 B2 JP7256354 B2 JP 7256354B2 JP 2018168731 A JP2018168731 A JP 2018168731A JP 2018168731 A JP2018168731 A JP 2018168731A JP 7256354 B2 JP7256354 B2 JP 7256354B2
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steel pipe
steel
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勝春 山田
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Nippon Steel Corp
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Description

本発明は、鋼管端部の形状保持構造及び鋼管の段積み方法に関する。 TECHNICAL FIELD The present invention relates to a shape retaining structure for steel pipe ends and a method for stacking steel pipes.

溶接などによって鋼管同士を材軸方向に連結する場合、鋼管端部が真円であることが要求される。鋼管端部の真円度が悪いと、例えば溶接部位にズレが生じ、良好な連結が困難となったり、連結作業に時間がかかるといった不都合が生じる。 When steel pipes are connected in the axial direction by welding or the like, the ends of the steel pipes are required to be perfectly circular. If the roundness of the ends of the steel pipes is poor, for example, the welded parts may be displaced, making it difficult to achieve a good connection, or it may take a long time to complete the connection.

鋼管の製造時に真円に造り込まれても、例えばクレーン吊りによる鋼管の搬送作業の際に、鋼管が衝突して真円度が悪化することがある。このような衝突荷重による鋼管への負荷は、鋼管の両端部のみをスキッド(ダンネージ、厘木、厘金ともいう。)で支持している鋼管の搬出入時に顕著になる傾向がある。また、鋼管を段積み貯蔵した際に、上段に配置された鋼管の自重が、下段に配置された鋼管に負荷され、下段に配置された鋼管の真円度を悪化させることがある。 Even if the steel pipe is made into a perfect circle during manufacture, the steel pipe may collide with the steel pipe during transportation of the steel pipe by, for example, a crane, resulting in deterioration of the roundness. The load on steel pipes due to such collision loads tends to become noticeable when carrying in and out of steel pipes that are supported only at their ends by skids (also called dunnages, scaffolds, and scaffolds). In addition, when steel pipes are stacked and stored, the weight of the steel pipes arranged in the upper tier is applied to the steel pipes arranged in the lower tier, which may deteriorate the roundness of the steel pipes arranged in the lower tier.

そのため、鋼管端部内面に接触して鋼管端部を支持する複数の支持柱を用いることが一般に行われている。
例えば特許文献1では、桟状材(支持柱)と保護板(外面保護板、内面保護板)を併用し、桟状材を保護板を介して鋼管端部内面に設置する鋼管端部養生具が開示されている。桟状材は、鋼管内面に接触して鋼管を支持すると同時に、鋼管端面にも接触して溶接開先を保護する。特許文献1によれば、桟状材と保護板の併用により、クレーンによる吊り扱い時や運搬時に、誤って衝突が生じても、衝撃を吸収する効果が高くなり、変形を効果的に防止することができるとしている。
Therefore, it is common practice to use a plurality of support columns that contact the inner surface of the steel pipe end to support the steel pipe end.
For example, in Patent Document 1, a steel pipe end curing tool that uses a crosspiece (supporting column) and a protection plate (outer surface protection plate, inner surface protection plate) together and installs the crosspiece on the inner surface of the steel pipe end via the protection plate. is disclosed. The cross piece material contacts the inner surface of the steel pipe to support the steel pipe, and at the same time, contacts the end face of the steel pipe to protect the weld groove. According to Patent Document 1, by using a cross member and a protective plate in combination, even if a collision occurs by mistake during suspension by a crane or during transportation, the effect of absorbing the impact is enhanced, and deformation is effectively prevented. It is possible.

また、特許文献2では、支持柱に代えて、鋼管端部を咬持する2対のクランプと、対となるクランプ同士を張絡するワイヤと、ワイヤ間に介在し、ワイヤに張力を付与する引張装置とを有する、鋼管の真円保持装置が開示されている。また、特許文献2には、鋼管の両端に設けた真円保持装置の中心部同士を脱落防止ワイヤで張絡して、真円保持装置の脱落を防止するようにしてもよいことが記載されている。 In addition, in Patent Document 2, instead of the support column, there are two pairs of clamps that clamp the end of the steel pipe, a wire that entangles the pair of clamps, and a wire that is interposed between the wires to apply tension to the wire. A steel pipe roundness retaining device is disclosed having a tensioning device. In addition, Patent Document 2 describes that the center portions of the roundness retaining devices provided at both ends of the steel pipe may be entwined with a drop-off prevention wire to prevent the roundness retaining device from falling off. ing.

実用新案登録第3169126号公報Utility Model Registration No. 3169126 特開2003-335360号公報JP-A-2003-335360

しかしながら、特許文献1に記載されている鋼管端部養生具では、鋼管が直径方向に熱膨張すると、鋼管外部側に支持柱が倒れやすく、仮に倒れずに傾く程度としても膨張後の収縮によって、支持柱を倒す力が発生する。なお、特許文献1には、保護板としてゴム状弾性板材を例示しているが、直径方向の熱膨張の際には、ゴム状弾性板材は、支持柱を鋼管端部から外す(倒す)力を発生させる。 However, in the steel pipe end curing tool described in Patent Document 1, when the steel pipe thermally expands in the diametrical direction, the support column tends to fall to the outside of the steel pipe. A force is generated that knocks down the support column. Although Patent Document 1 exemplifies a rubber-like elastic plate material as a protective plate, the rubber-like elastic plate material exerts a force that removes (falls) the support column from the end of the steel pipe during thermal expansion in the diametrical direction. generate

また、特許文献2記載の真円保持装置では、鋼管直径方向の熱収縮時に鋼管端面を咬持する2対のクランプ間に配置したワイヤが弛緩し、クランプが脱落する場合がある。特許文献2では、当該脱落を防止するため、鋼管両端に配置した真円保持装置間に脱落防止ワイヤを張絡することを記載するが、鋼管材軸方向の膨張収縮に伴って、脱落防止ワイヤが弛緩し、クランプの脱落を防止できない場合がある。 Further, in the roundness retaining device described in Patent Document 2, the wire arranged between the two pairs of clamps that hold the end face of the steel pipe loosens during thermal contraction in the steel pipe diameter direction, and the clamps may fall off. In Patent Document 2, in order to prevent the falling off, it is described that the falling-off preventing wire is entwined between the roundness retaining devices arranged at both ends of the steel pipe. loosens and may not prevent the clamp from falling off.

本発明はかかる事情に鑑みてなされたもので、鋼管の運搬や貯蔵時に、鋼管端部を支持する支持柱が倒れず、鋼管端部の真円度悪化を防止することができる鋼管端部の形状保持構造及び鋼管の段積み方法を提供することを目的とする。 The present invention has been made in view of such circumstances, and is capable of preventing the deterioration of the roundness of the ends of steel pipes by preventing the support columns that support the ends of steel pipes from collapsing when the steel pipes are transported or stored. It is an object of the present invention to provide a shape retaining structure and a steel pipe stacking method.

上記目的を達成するため、第1の発明は、鋼管の端部に形状保持具を装着して鋼管端部の形状を保持する構造であって、
前記形状保持具は、鋼管端部の内面に当接して該鋼管端部を内方から支持する複数の支持柱と、前記各支持柱の端部に取り付けられ、該支持柱を前記鋼管端部に固定する留め部材とを備え、
前記留め部材は、前記支持柱に接合される接合部と、前記鋼管端部の外面上にあって該鋼管の材軸方向に延在する延在部とを有し、
前記留め部材の延在部に外接するように前記鋼管端部の外周面に沿って巻き付けられた結束バンドによって、該留め部材の延在部が前記鋼管端部に固定されていることを特徴としている(但し、前記各支持柱の端部に取り付けられた前記留め部材が、クリップ上端及びクリップ下端を備え当該クリップ上端及び下端間で弾性を有し、前記鋼管に装着するクリップである場合を除く)。
In order to achieve the above object, a first invention is a structure in which a shape retainer is attached to the end of a steel pipe to retain the shape of the end of the steel pipe,
The shape retainer includes a plurality of support columns that abut against the inner surface of the steel pipe end to support the steel pipe end from the inside; a fastening member that secures to the
The fastening member has a joint portion that is joined to the support column and an extension portion that is on the outer surface of the end portion of the steel pipe and extends in the axial direction of the steel pipe,
The extending portion of the fastening member is fixed to the steel pipe end portion by a binding band wound along the outer peripheral surface of the steel pipe end portion so as to circumscribe the extension portion of the fastening member. (Excluding the case where the fastening member attached to the end of each support column is a clip that has a clip upper end and a clip lower end, has elasticity between the clip upper end and the clip lower end, and is attached to the steel pipe. ).

ここで、「鋼管端部の内面に当接して」とは、支持柱が鋼管端部の内面に直接接触する場合のみならず、支持柱と鋼管端部の内面との間に楔等を介挿して、支持柱が鋼管端部の内面に間接接触する場合も含む。 Here, "in contact with the inner surface of the end of the steel pipe" means not only the case where the supporting column directly contacts the inner surface of the end of the steel pipe, but also the case where a wedge or the like is interposed between the supporting column and the inner surface of the end of the steel pipe. In addition, it also includes the case where the support column is in indirect contact with the inner surface of the end of the steel pipe.

鋼管が直径方向に膨張収縮しても、鋼管端部の外周面に沿って巻き付けられた結束バンドの張力は維持されるので、結束バンドと鋼管の間に挟み込まれている留め部材が脱落することはない。その結果、支持柱は配置された箇所に留まり、鋼管が膨張収縮しても支持柱の支持効果が維持され、鋼管端部の真円度が維持される。 Even if the steel pipe expands and contracts in the diameter direction, the tension of the binding band wound along the outer peripheral surface of the end of the steel pipe is maintained, so that the fastening member sandwiched between the binding band and the steel pipe does not fall off. no. As a result, the support columns stay where they are placed, and even if the steel pipe expands and contracts, the support effect of the support columns is maintained, and the roundness of the ends of the steel pipe is maintained.

また、第1の発明に係る鋼管端部の形状保持構造では、前記鋼管は、両端部を除く外面の中間部が塗料及び/又は樹脂で被覆されていてもよい。 In the steel pipe end shape retaining structure according to the first invention, the steel pipe may be coated with paint and/or resin at an intermediate portion of the outer surface excluding both end portions.

被覆鋼管の場合、被覆部位が破損しないように、段積み時に鋼管同士の接触を避けるために用いるスキッドを鋼管両端部にしか配置することができない。鋼管両端部にのみスキッドを配置すると、鋼管端部の真円度が悪化する可能性が高くなるが、本発明では鋼管端部に形状保持具を装着するので、鋼管端部の真円度の悪化を防止することができるだけでなく、被覆部位に形状保持具が接触して被覆部位が破損したり汚損したりする心配が無い。 In the case of coated steel pipes, skids, which are used to avoid contact between the steel pipes during stacking, can only be placed at both ends of the steel pipes so that the coated portions are not damaged. If skids are placed only at both ends of the steel pipe, there is a high possibility that the roundness of the ends of the steel pipe will deteriorate. Not only can the deterioration be prevented, but there is no concern that the covered portion will be damaged or soiled due to contact of the shape retainer with the covered portion.

また、第2の発明に係る鋼管の段積み方法は、第1の発明における形状保持具が少なくとも一方の端部に装着された鋼管を鉛直方向に積み上げる際、上下に隣接する前記鋼管の端部間にスキッドを介装し、前記形状保持具が装着された鋼管端部に介装される前記スキッドの位置を、第1の発明における結束バンド近傍の鋼管外面とすることを特徴としている。 A method for stacking steel pipes according to a second aspect of the present invention is characterized in that, when vertically stacking steel pipes having at least one end thereof fitted with a shape retainer according to the first invention, the vertically adjacent ends of the steel pipes A skid is interposed therebetween, and the position of the skid interposed at the end of the steel pipe to which the shape retainer is attached is the outer surface of the steel pipe in the vicinity of the binding band in the first invention.

なお、第2の発明において、「形状保持具が少なくとも一方の端部に装着された鋼管」としているのは以下の理由に拠る。
・鋼管の一方の端部を含む側は塗装し、他方の端部を含む側は塗装しない場合がある。例えば、材軸方向片側半分のみ塗装する場合である。この場合、塗装していない部位にはスキッドを配置するので形状保持具は不要となるが、塗装した部位にはスキッドを配置することができないので形状保持具が必要となる。
・鋼管の一方の端部のみに厚肉の継手が溶接されている場合、他方の端部には形状保持具が必要となる。
In addition, in the second invention, "a steel pipe having a shape retainer attached to at least one end" is based on the following reasons.
・There are cases where the side including one end of the steel pipe is painted and the side including the other end is not painted. For example, this is the case where only one half of the material is coated in the axial direction. In this case, a skid is placed on the unpainted portion, so the shape retainer is not required.
• If a thick joint is welded to only one end of a steel pipe, a shape retainer is required at the other end.

鋼管貯蔵時における鋼管の段積みでは、鋼管端部の真円度を維持するため、段積み数に制約を設けている。例えば、船倉容積では5段積みが可能なのに、段積み荷重によって下段の鋼管の真円度悪化を回避するため、2~3段積みで出荷している。
特に被覆鋼管の場合、上述したように、被覆部位の破損を防ぐため、鋼管両端部にしかスキッドを配置することができないが、鋼管両端部にのみスキッドを配置すると、下から2段目の鋼管から最上段の鋼管までの自重が最下段の鋼管の両端部のみに負荷されるため、真円度悪化の懸念が大きくなる。
When steel pipes are stacked during storage, the number of stacks is restricted in order to maintain the roundness of the end portions of the steel pipes. For example, although it is possible to stack five layers in the hold capacity, in order to avoid deterioration of the roundness of the steel pipes in the lower layer due to the stacking load, they are shipped in two to three layers.
Especially in the case of coated steel pipes, as mentioned above, skids can only be placed on both ends of the steel pipe in order to prevent damage to the coated parts. to the uppermost steel pipe, the dead weight is applied only to both ends of the lowermost steel pipe.

しかし、本発明によれば、船積み等による搬送時や貯蔵時等において、鋼管を段積みすることによって段積み荷重が鋼管に負荷されても、支持柱が倒れないので、真円度の悪化を防止することができる。また被覆部位の破損も防止でき、段積み数の増加も可能となる。 However, according to the present invention, even if a stacking load is applied to the steel pipes by stacking the steel pipes during transportation by shipping or storage, the supporting columns do not fall down, so that the roundness is not deteriorated. can be prevented. In addition, it is possible to prevent damage to the covered portion and increase the number of stacks.

本発明では、鋼管端部を支持する支持柱が留め部材を介して該鋼管端部に固定されているので、鋼管の運搬や貯蔵時に支持柱が倒れず、鋼管端部の真円度悪化を防止することができる。 In the present invention, the support columns that support the ends of the steel pipes are fixed to the ends of the steel pipes via fastening members, so that the support columns do not fall down during transportation or storage of the steel pipes, thereby preventing deterioration of the roundness of the ends of the steel pipes. can be prevented.

(A)は本発明の一実施の形態に係る鋼管端部の形状保持構造を正面から見た図、(B)は同鋼管端部の形状保持構造を側面から見た図である。1A is a front view of a shape retaining structure for an end of a steel pipe according to an embodiment of the present invention, and FIG. 1B is a side view of the shape retaining structure for the end of the steel pipe. 同鋼管端部の形状保持構造の部分斜視図である。It is a partial perspective view of the shape retention structure of the same steel pipe end. 変形例に係る鋼管端部の形状保持構造の部分斜視図である。It is a partial perspective view of the shape retention structure of the steel-pipe edge part which concerns on a modification. (A)は留め部材の第1変形例、(B)は留め部材の第2変形例、(C)は留め部材の第3変形例の各斜視図である。(A) is a 1st modification of a fastening member, (B) is a 2nd modification of a fastening member, (C) is each perspective view of the 3rd modification of a fastening member. (A)は本発明の一実施の形態に係る鋼管の段積み方法による段積み例1、(B)は同鋼管の段積み方法による段積み例2の各模式図である。FIG. 2A is a schematic view of stacking example 1 by a steel pipe stacking method according to an embodiment of the present invention, and FIG. 3B is a schematic view of stacking example 2 by the same steel pipe stacking method.

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いて説明し、本発明の理解に供する。なお、本明細書及び図面において実質的に同一の機能を有する構成要素については、同一の符号を付することにより重複説明を省略する。 Next, an embodiment embodying the present invention will be described with reference to the attached drawings for understanding of the present invention. In the present specification and drawings, constituent elements having substantially the same functions are denoted by the same reference numerals, thereby omitting redundant description.

本発明の一実施の形態に係る鋼管端部の形状保持構造は、鋼管の端部に形状保持具を装着して鋼管端部の形状を保持する。図1(A)(B)及び図2に本実施の形態に係る鋼管端部の形状保持構造を示す。
なお、本発明の課題を有する鋼管は、例えば外径400mm~2500mm、肉厚6mm~25mm、長さ5m~30mの鋼管である。
A shape retaining structure for an end of a steel pipe according to an embodiment of the present invention retains the shape of the end of the steel pipe by attaching a shape retainer to the end of the steel pipe. 1(A), 1(B) and 2 show the shape retaining structure of the steel pipe end portion according to the present embodiment.
The steel pipe having the problem of the present invention is, for example, a steel pipe having an outer diameter of 400 mm to 2500 mm, a wall thickness of 6 mm to 25 mm, and a length of 5 m to 30 m.

形状保持具11は、鋼管端部の内面に当接して該鋼管端部を内方から支持する複数の支持柱13と、各支持柱13の端部に取り付けられ、支持柱13を鋼管端部に固定する留め部材16とを備えている。 The shape retainer 11 includes a plurality of support columns 13 that contact the inner surface of the end of the steel pipe to support the end of the steel pipe from the inside, and the end of each support column 13. and a fastening member 16 for fixing to the.

支持柱13は、一辺が30mm以上の矩形断面を有する棒材であり、本実施の形態では、2本の支持柱13を十字状に交差させて鋼管端部の内面に当接させている。図2に示すように、支持柱13の端部には側面視してL字状の段差部13aが形成されており、鋼管端部の内面に当接すると共に、鋼管10の端面にも当接し溶接開先部を保護する。
支持柱13は木製、金属製のいずれであってもよく、鋼管端部の内面に当接して該鋼管端部を内方から支持する機能があればよい。
The support columns 13 are rods having a rectangular cross section with one side of 30 mm or more, and in the present embodiment, two support columns 13 cross each other in a cross shape and are brought into contact with the inner surface of the end of the steel pipe. As shown in FIG. 2, an L-shaped stepped portion 13a is formed at the end of the support column 13 when viewed from the side, and abuts against the inner surface of the end of the steel pipe as well as the end face of the steel pipe 10. Protect the weld groove.
The support column 13 may be made of wood or metal, and should have the function of contacting the inner surface of the end of the steel pipe and supporting the end of the steel pipe from the inside.

留め部材16は、支持柱13に接合される接合部16aと、鋼管端部の外面上にあって鋼管10の材軸方向に延在する延在部16bとを有している。本実施の形態における留め部材16はL字状の帯板金具からなり、帯板金具の折れ曲り部を境にして、一方が接合部16a、他方が延在部16bとされている。
留め部材16の接合部16aには、留め部材16を支持柱13にネジ20で固定するためのネジ孔(図示省略)が形成されている。一方、留め部材16の延在部16bは、留め部材16の延在部16bに外接するように鋼管端部の外周面に沿って巻き付けられた結束バンド15によって鋼管端部に固定されている。
The fastening member 16 has a joint portion 16 a that is joined to the support column 13 and an extension portion 16 b that is on the outer surface of the end of the steel pipe and extends in the axial direction of the steel pipe 10 . The fastening member 16 in the present embodiment is made of an L-shaped band metal fitting, and has a joint portion 16a on one side and an extension portion 16b on the other side with the bent portion of the metal strip as a boundary.
A screw hole (not shown) for fixing the fastening member 16 to the support column 13 with a screw 20 is formed in the joint portion 16 a of the fastening member 16 . On the other hand, the extending portion 16b of the retaining member 16 is fixed to the end of the steel pipe by a binding band 15 wound along the outer peripheral surface of the end of the steel pipe so as to circumscribe the extending portion 16b of the retaining member 16.

なお、留め部材16は必ずしも金具である必要はなく、プラスチックフープや紐等を留め部材として使用しても良い。また、留め部材16の接合部16aを支持柱13に固定する方法はネジ止めに限るものではなく、釘打ちやくくりつけ等でも良い。 The fastening member 16 does not necessarily have to be a metal fitting, and a plastic hoop, string, or the like may be used as the fastening member. Moreover, the method of fixing the joint portion 16a of the fastening member 16 to the support column 13 is not limited to screwing, and nailing, binding, or the like may also be used.

結束バンド15には、プラスチックフープや金属バンド、紐等を使用することができる。鋼管端部の外周面に巻き付けた結束バンド15を締め付けることによって、鋼管端部と結束バンド15に挟み込まれた留め部材16の延在部16bが鋼管端部上に固定される。 A plastic hoop, a metal band, a string, or the like can be used for the binding band 15 . By tightening the binding band 15 wound around the outer peripheral surface of the steel pipe end, the extending portion 16b of the fastening member 16 sandwiched between the steel pipe end and the binding band 15 is fixed on the steel pipe end.

鋼管10は、両端部を除く外面の中間部が塗料及び/又は樹脂で被覆されていてもよい。塗料には、色彩付与や防錆を目的としたものの他、瀝青系塗料などがあり、樹脂には例えばウレタンやエポキシがある。 The steel pipe 10 may be coated with paint and/or resin at the intermediate portion of the outer surface excluding both ends. Paints include bitumen-based paints and the like, in addition to paints intended for imparting color and rust prevention, and resins include, for example, urethane and epoxy.

被覆材の破損を避けるため、鋼管両端部は被覆処理をせず、鋼管両端部にスキッドを配置して貯蔵することにより、被覆部位と、例えば貯蔵場所の床面との接触を防止する処置が採られる。鋼管両端部にのみスキッドを配置すると、鋼管端部の真円度が悪化する可能性が高くなるが、鋼管端部に形状保持具11を装着することにより、鋼管端部の真円度の悪化を防止することができる。 In order to avoid damage to the coating material, both ends of the steel pipe are not coated, and skids are placed on both ends of the steel pipe to prevent contact between the coating and, for example, the floor of the storage area. taken. Placing skids only at both ends of the steel pipe increases the possibility of deteriorating the roundness of the ends of the steel pipe. can be prevented.

変形例に係る鋼管端部の形状保持構造を図3に示す。
変形例に係る鋼管端部の形状保持構造では、形状保持具12を構成する支持柱14の端部に段差部が形成されておらず、支持柱14の端面全体が鋼管端部の内面に当接する。
FIG. 3 shows a shape retaining structure of a steel pipe end according to a modification.
In the shape retaining structure of the steel pipe end according to the modified example, the end of the support column 14 constituting the shape retainer 12 is not formed with a stepped portion, and the entire end surface of the support column 14 contacts the inner surface of the steel pipe end. touch.

留め部材の変形例を図4に示す。
図4(A)の変形例に係る留め部材17では、延在部17bの端部17c(鋼管材軸方向の中央部側)が外側に折り曲げられ、折り曲げられた端部17cの隙間に結束バンド15が挿入されている。
図4(B)の変形例に係る留め部材18も、図4(A)の変形例に係る留め部材17と同様、延在部18bの端部18c(鋼管材軸方向の中央部側)が外側に折り曲げられているが、側面視して端部18cの形状が三角形状とされ、鋼管材軸方向の中央部側に向けて上方に傾斜している。結束バンド15は、端部18cに近接する鋼管端部側に配置されている。
図4(C)の変形例に係る留め部材19では、延在部19bの端部(鋼管材軸方向の中央部側)近傍にステップ状の突起部19cが形成され、突起部19cに近接する鋼管端部側に結束バンド15が配置されている。
A modification of the fastening member is shown in FIG.
In the fastening member 17 according to the modification shown in FIG. 4A, the end 17c (center side in the axial direction of the steel pipe material) of the extension 17b is bent outward, and a binding band is inserted into the gap between the bent ends 17c. 15 is inserted.
In the fastening member 18 according to the modification shown in FIG. 4B, similarly to the fastening member 17 according to the modification shown in FIG. Although it is bent outward, the end portion 18c has a triangular shape when viewed from the side, and is inclined upward toward the central portion in the axial direction of the steel pipe material. The binding band 15 is arranged on the steel pipe end side close to the end 18c.
In the fastening member 19 according to the modification of FIG. 4(C), a stepped projection 19c is formed near the end of the extension 19b (on the center side in the axial direction of the steel pipe material), and is close to the projection 19c. A binding band 15 is arranged on the end side of the steel pipe.

次に、本発明の一実施の形態に係る鋼管の段積み方法について説明する。
本実施の形態に係る鋼管の段積み方法では、形状保持具11、12が少なくとも一方の端部に装着された鋼管10を鉛直方向に積み上げる際、上下に隣接する鋼管10の端部間にスキッドを介装する。その際、形状保持具11、12が装着された鋼管端部に介装されるスキッドの位置を結束バンド15近傍の鋼管外面とする。
Next, a method for stacking steel pipes according to an embodiment of the present invention will be described.
In the steel pipe stacking method according to the present embodiment, when the steel pipes 10 each having at least one end thereof with the shape retainers 11 and 12 are vertically stacked, a skid is formed between the ends of the vertically adjacent steel pipes 10 . intervene. At that time, the position of the skid interposed at the ends of the steel pipe to which the shape retainers 11 and 12 are attached is the outer surface of the steel pipe in the vicinity of the binding band 15 .

鋼管10の段積み例を図5に示す。
図5(A)の段積み例では、下段に配置された鋼管10の直上に鋼管10を配置している。上段に配置された鋼管10と下段に配置された鋼管10との間には、水平方向に延在する長尺のスキッド21を介装する。また、水平方向に隣接する鋼管10の間には仕切板23を設置する。最下段に配置される鋼管10の直下にも、水平方向に延在する長尺のスキッド21を介装し、水平方向に隣接する鋼管10の間に仕切板23を設置する。
この例では、鋼管10の自重が鉛直方向に作用するため、支持柱13を鉛直方向と水平方向にそれぞれ配置する。
An example of stacking the steel pipes 10 is shown in FIG.
In the stacking example of FIG. 5A, the steel pipes 10 are arranged directly above the steel pipes 10 arranged in the lower stage. A horizontally extending long skid 21 is interposed between the steel pipe 10 arranged in the upper stage and the steel pipe 10 arranged in the lower stage. A partition plate 23 is installed between the steel pipes 10 adjacent in the horizontal direction. A horizontally extending long skid 21 is also interposed directly below the steel pipes 10 arranged in the lowest stage, and a partition plate 23 is installed between the steel pipes 10 adjacent in the horizontal direction.
In this example, since the weight of the steel pipe 10 acts in the vertical direction, the support columns 13 are arranged in the vertical direction and the horizontal direction, respectively.

図5(B)の段積み例では、下段に配置された隣接する鋼管10の間に上段の鋼管10を配置している。いわゆる俵積みである。最下段に配置される鋼管10の直下には、水平方向に延在する長尺のスキッド21を介装し、水平方向に隣接する鋼管10の間には仕切板23を設置する。また、下段に配置される鋼管10とその上段に隣接して配置される鋼管10の間には、幅の短いスキッド22を正面視してハの字状に配置する。
この例では、鋼管10の自重が水平面に対して45°と135°の方向に作用するので、支持柱13も自重の作用方向と同じ方向にそれぞれ配置する。
In the stacking example of FIG. 5B, the steel pipes 10 in the upper stage are arranged between the adjacent steel pipes 10 arranged in the lower stage. It is so-called bales. A long skid 21 extending in the horizontal direction is interposed directly below the steel pipe 10 arranged in the lowest stage, and a partition plate 23 is installed between the steel pipes 10 adjacent in the horizontal direction. Further, between the steel pipe 10 arranged in the lower stage and the steel pipe 10 arranged adjacently in the upper stage, a skid 22 having a short width is arranged in a V shape when viewed from the front.
In this example, the weight of the steel pipe 10 acts in directions of 45° and 135° with respect to the horizontal plane, so the support columns 13 are also arranged in the same direction as the acting direction of the weight of the steel pipe 10 .

なお、図5(A)(B)の段積み例では、全ての鋼管10に形状保持具11を装着しているが、最上段に配置される鋼管10については、必ずしも形状保持具11を装着する必要はない。 5A and 5B, the shape retainers 11 are attached to all the steel pipes 10, but the shape retainers 11 are not necessarily attached to the steel pipes 10 arranged in the uppermost tier. do not have to.

以上、本発明の一実施の形態について説明してきたが、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、上記実施の形態では、形状保持具を構成する支持柱の本数は2本としているが、3本以上でも良い。 Although one embodiment of the present invention has been described above, the present invention is not limited to the configuration described in the above-described embodiment. Other possible embodiments and modifications are also included. For example, in the above embodiment, the number of support columns constituting the shape retainer is two, but it may be three or more.

本発明の効果について検証するために実施した検証試験について説明する。
[検証試験1]
外径1000mm、肉厚6mm~25mm、長さ5m~30mの鋼管を使用した。
Verification tests conducted to verify the effects of the present invention will be described.
[Verification test 1]
A steel pipe with an outer diameter of 1000 mm, a wall thickness of 6 mm to 25 mm, and a length of 5 m to 30 m was used.

実施例1では、前述した実施の形態と同様の支柱柱(50mm×50mmの矩形断面の木製柱を十字状に配置)と留め部材を備える形状保持具を鋼管両端部に装着し、1ロット(約160本)を4回出荷した。
形状保持具を鋼管端部に装着した後7~10日目の確認では、鋼管全数において、支持柱は、配置した状態を保っており、傾いた支持柱や倒れた支持柱は無かった。
In Example 1, shape-retaining fixtures having pillars (wooden pillars with a rectangular cross section of 50 mm x 50 mm arranged in a cross shape) and retaining members similar to those in the above-described embodiment were attached to both ends of the steel pipe, and one lot ( Approximately 160) were shipped four times.
After 7 to 10 days from attaching the shape retainer to the end of the steel pipe, all the steel pipes were confirmed to have the support columns in the arranged state, and there were no tilted or fallen support columns.

一方、比較例1の鋼管は、鋼管両端部に複数の支持柱を配置したのみであって留め部材を用いていない。1ロット当りの本数は実施例1と同様であり、1ロットの鋼管を1回出荷した。
支持柱を配置して7~10日後の確認では、鋼管全数において、支持柱が少なくとも傾いており、過半の鋼管において、倒れた支持柱が確認された。
On the other hand, in the steel pipe of Comparative Example 1, only a plurality of support columns were arranged at both ends of the steel pipe, and no fastening members were used. The number of steel pipes per lot was the same as in Example 1, and one lot of steel pipes was shipped once.
After 7 to 10 days from the placement of the support columns, it was confirmed that the support columns were at least tilted in all the steel pipes, and that the support columns had collapsed in the majority of the steel pipes.

[検証試験2]
外径1000mm、肉厚6mm~25mm、長さ5m~30mの鋼管を用いた。両端部0.3mを除いた中間部は瀝青系塗料を塗布している。スキッドのサイズは120mm×120mm×300mmである。
[Verification test 2]
A steel pipe having an outer diameter of 1000 mm, a wall thickness of 6 mm to 25 mm, and a length of 5 m to 30 m was used. Bituminous paint is applied to the middle part except for the 0.3m at both ends. The size of the skid is 120mm x 120mm x 300mm.

実施例2では、前述した実施の形態と同様の支柱柱(50mm×50mmの矩形断面の木製柱を十字状に配置)と留め部材を備える形状保持具を鋼管両端部に装着し、1ロット(約160本)を4回出荷した。
形状保持具を鋼管端部に装着した後、4段に段積みして船積みして搬送(船内貯蔵は約4日)、船からの荷降ろし後は鋼管杭施工現場までトラック搬送(段積み無し)し、施工現場で3段の段積みで貯蔵した。形状保持具を鋼管端部に装着した後7~10日目の確認では、鋼管全数において、支持柱は、配置した状態を保っていた。その後、鋼管を上下方向に溶接して杭の施工をした際、1ロット約160本、4ロット全てについて、溶接に不都合がある真円度悪化は無かった。
In Example 2, shape-retaining fixtures having pillars (wooden pillars with a rectangular cross section of 50 mm x 50 mm arranged in a cross shape) and fastening members similar to those in the above-described embodiment were attached to both ends of the steel pipe, and one lot ( Approximately 160) were shipped four times.
After attaching shape-retaining fixtures to the ends of steel pipes, they are stacked in four layers, loaded on a ship, and transported (stored on board for about four days). ) and stored at the construction site in three layers. After 7 to 10 days from attaching the shape retainer to the end of the steel pipe, the supporting columns remained in the arranged state in all the steel pipes. After that, when the piles were constructed by welding the steel pipes in the vertical direction, there was no deterioration in roundness that would be inconvenient for welding in all of the four lots of about 160 piles per lot.

一方、比較例2の鋼管は、鋼管両端部に複数の支持柱を配置したのみであって、留め部材を用いていない。1ロット当りの本数は実施例2と同様であり、1ロットの鋼管を1回出荷した。
支持柱を配置した後、4段に段積みして船積みして搬送(船内貯蔵は約4日)、船からの荷降ろし後は鋼管杭施工現場までトラック搬送(段積み無し)し、施工現場で3段の段積みで貯蔵した。支持柱の配置後7~10日目の確認では、過半の鋼管において、倒れた支持柱が確認された。また、その後の杭の施工において、溶接時に真円度矯正を実施する頻度が1割程度あった。
On the other hand, in the steel pipe of Comparative Example 2, only a plurality of support columns were arranged at both ends of the steel pipe, and no fastening members were used. The number of steel pipes per lot was the same as in Example 2, and one lot of steel pipes was shipped once.
After arranging the support pillars, the piles are stacked in four layers, loaded on the ship, and transported (stored on board for about 4 days). It was stored in 3 tiers. Seven to ten days after the support columns were placed, most of the steel pipes were found to have collapsed support columns. In addition, in the subsequent construction of piles, the frequency of roundness correction during welding was about 10%.

10:鋼管、11、12:形状保持具、13、14:支持柱、13a:段差部、15:結束バンド、16、17、18、19:留め部材、16a:接合部、16b、17b、18b、19b:延在部、17c、18c:端部、19c:突起部、20:ネジ、21、22:スキッド、23:仕切板 10: steel pipe, 11, 12: shape retainer, 13, 14: support column, 13a: stepped portion, 15: binding band, 16, 17, 18, 19: fastening member, 16a: joint portion, 16b, 17b, 18b , 19b: extension portion, 17c, 18c: end portion, 19c: projection portion, 20: screw, 21, 22: skid, 23: partition plate

Claims (3)

鋼管の端部に形状保持具を装着して鋼管端部の形状を保持する構造であって、
前記形状保持具は、鋼管端部の内面に当接して該鋼管端部を内方から支持する複数の支持柱と、前記各支持柱の端部に取り付けられ、該支持柱を前記鋼管端部に固定する留め部材とを備え、
前記留め部材は、前記支持柱に接合される接合部と、前記鋼管端部の外面上にあって該鋼管の材軸方向に延在する延在部とを有し、
前記留め部材の延在部に外接するように前記鋼管端部の外周面に沿って巻き付けられた結束バンドによって、該留め部材の延在部が前記鋼管端部に固定されていることを特徴とする鋼管端部の形状保持構造(但し、前記各支持柱の端部に取り付けられた前記留め部材が、クリップ上端及びクリップ下端を備え当該クリップ上端及び下端間で弾性を有し、前記鋼管に装着するクリップである場合を除く)。
A structure in which a shape retainer is attached to the end of the steel pipe to retain the shape of the end of the steel pipe,
The shape retainer includes a plurality of support columns that abut against the inner surface of the steel pipe end to support the steel pipe end from the inside; a fastening member that secures to the
The fastening member has a joint portion that is joined to the support column and an extension portion that is on the outer surface of the end portion of the steel pipe and extends in the axial direction of the steel pipe,
The extending portion of the fastening member is fixed to the end of the steel pipe by a binding band wound along the outer peripheral surface of the end of the steel pipe so as to circumscribe the extension of the fastening member. Shape retention structure for steel pipe ends (however, the fastening member attached to the end of each support column has a clip upper end and a clip lower end, has elasticity between the clip upper end and the clip lower end, and is attached to the steel pipe clip ).
請求項1記載の鋼管端部の形状保持構造において、前記鋼管は、両端部を除く外面の中間部が塗料及び/又は樹脂で被覆されていることを特徴とする鋼管端部の形状保持構造。 2. The shape retaining structure for steel pipe ends according to claim 1, wherein said steel pipe is coated with paint and/or resin at an intermediate portion of its outer surface excluding both end portions. 請求項1又は2記載の形状保持具が少なくとも一方の端部に装着された鋼管を鉛直方向に積み上げる際、上下に隣接する前記鋼管の端部間にスキッドを介装し、前記形状保持具が装着された鋼管端部に介装される前記スキッドの位置を請求項1記載の結束バンド近傍の鋼管外面とすることを特徴とする鋼管の段積み方法。 When the steel pipes having at least one end thereof fitted with the shape retainer according to claim 1 or 2 are vertically stacked, a skid is interposed between the ends of the steel pipes adjacent to each other in the vertical direction so that the shape retainer is A method of stacking steel pipes, wherein the position of the skid interposed at the ends of the attached steel pipes is on the outer surface of the steel pipes in the vicinity of the binding band according to claim 1.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005090729A (en) 2003-09-22 2005-04-07 Nittetsu Corrosion Prevention Co Ltd Corrosive-resistant coated structure and corrosive-resistant coating method for resin coated steel material joint section
JP2006193162A (en) 2005-01-11 2006-07-27 Nikko Unyu Kk Spacer for loading member having circular outer section
CN201704963U (en) 2010-04-13 2011-01-12 辽宁省电力有限公司盘锦供电公司 Device for straightening curved tower material of iron tower
JP2014142028A (en) 2013-01-24 2014-08-07 Cosmo Koki Co Ltd Anticorrosion device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5113250B2 (en) * 1971-12-02 1976-04-27
JPS6037395Y2 (en) * 1977-06-23 1985-11-07 新日本製鐵株式会社 dunnage
JPH01210689A (en) * 1988-02-18 1989-08-24 Nitto Denko Corp Repairing method for defective part of anticorrosive layer
JP2003335360A (en) * 2002-05-14 2003-11-25 Jfe Engineering Kk Apparatus and method for holding roundness of steel pipe
KR20050046994A (en) * 2003-11-15 2005-05-19 이승도 Pipe an outside diameter a device protector
JP3169126U (en) * 2011-05-02 2011-07-14 五洋建設株式会社 Steel pipe end curing tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005090729A (en) 2003-09-22 2005-04-07 Nittetsu Corrosion Prevention Co Ltd Corrosive-resistant coated structure and corrosive-resistant coating method for resin coated steel material joint section
JP2006193162A (en) 2005-01-11 2006-07-27 Nikko Unyu Kk Spacer for loading member having circular outer section
CN201704963U (en) 2010-04-13 2011-01-12 辽宁省电力有限公司盘锦供电公司 Device for straightening curved tower material of iron tower
JP2014142028A (en) 2013-01-24 2014-08-07 Cosmo Koki Co Ltd Anticorrosion device

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