JP6406168B2 - Flange joint reinforcement jig - Google Patents
Flange joint reinforcement jig Download PDFInfo
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- JP6406168B2 JP6406168B2 JP2015162139A JP2015162139A JP6406168B2 JP 6406168 B2 JP6406168 B2 JP 6406168B2 JP 2015162139 A JP2015162139 A JP 2015162139A JP 2015162139 A JP2015162139 A JP 2015162139A JP 6406168 B2 JP6406168 B2 JP 6406168B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/728—Onshore wind turbines
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- Flanged Joints, Insulating Joints, And Other Joints (AREA)
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Description
本発明は、下側の鋼管の端部に設けられた下水平フランジ部と、上側の鋼管の端部に設けられた上水平フランジ部をボルト及びナットによって接合して前記鋼管同士を接合してなるタワー構造体におけるフランジ接合部を補強するフランジ接合部補強治具に関する。 The present invention joins the steel pipes by joining the lower horizontal flange part provided at the end of the lower steel pipe and the upper horizontal flange part provided at the end of the upper steel pipe with bolts and nuts. The present invention relates to a flange joint reinforcing jig for reinforcing a flange joint in a tower structure.
フランジによって鋼管同士を接合するフランジ接合部を補強するフランジ接合部補強治具としては、例えば特許文献１に開示されたフランジ補強治具がある。
特許文献１のフランジ補強治具は、「管フランジ継手のフランジ接合部におけるフランジ補強治具であって、該フランジ補強治具が、フランジ接合部をまたぐようにフランジ周方向に間隔をおいて配される複数の補強部材と、フランジ部背面付根部分に当接した状態で、前記補強部材によりフランジ部背面に押し当てられる当て部材と、前記複数の補強部材を管体に固定するための締付部材とからなり、
前記補強部材が、一方のフランジ部背面の付根部分に当接する押圧部Ａ１と、前面が他方のフランジ部背面の付根部分に当接した前記当て部材背面に当接し、該当て部材をフランジ部背面に押し当てる押し当て部Ａ２と、該押し当て部Ａ２側に管壁に沿うように突出して設けられた締付部Ａ３とを有し、
前記締付部材がリング形状を有し、前記複数配される補強部材のそれぞれの締付部Ａ３を、管の中心方向に締付可能に構成されていることを特徴とする」ものである（請求項１参照）。
As a flange joint reinforcing jig that reinforces a flange joint that joins steel pipes with a flange, for example, there is a flange reinforcing jig disclosed in Patent Document 1.
The flange reinforcement jig disclosed in Patent Document 1 is “a flange reinforcement jig in a flange joint portion of a pipe flange joint, and the flange reinforcement jig is arranged at intervals in the flange circumferential direction so as to straddle the flange joint portion. A plurality of reinforcing members, a contact member pressed against the back surface of the flange portion by the reinforcing member in contact with the root portion of the back surface of the flange portion, and fastening for fixing the plurality of reinforcing members to the tubular body Consisting of members,
The reinforcing member is in contact with the pressing portion A1 that is in contact with the root portion on the back surface of one flange portion, and the front surface is in contact with the back surface of the abutting member that is in contact with the root portion on the back surface of the other flange portion. A pressing portion A2 that presses against the pressing portion, and a tightening portion A3 that protrudes along the tube wall on the pressing portion A2 side,
The tightening member has a ring shape, and each tightening portion A3 of the plurality of reinforcing members is configured to be tightenable in the central direction of the tube. (See claim 1).
鋼管同士をフランジ接合したタワー構造体として、例えば図６に示すような風力発電設備１７の塔体１９がある。
風外力の作用時や風車発電時などでは、塔体１９頂部に設置されるブレード２１に風力が作用することにより、塔体１９に転倒モーメントが作用する。転倒モーメントの作用により、塔体１９の断面には繰り返し応力が作用する。一般的に風力発電設備の供用期間は２０年とされているが、この２０年間に、約２億回に及ぶ繰り返し応力が作用すると想定される。
As a tower structure in which steel pipes are flange-joined, there is a tower body 19 of a wind power generation facility 17 as shown in FIG. 6, for example.
When wind external force is applied or wind turbine power generation is performed, wind force acts on the blade 21 installed at the top of the tower body 19, so that a tipping moment acts on the tower body 19. A stress is repeatedly applied to the cross section of the tower body 19 by the action of the overturning moment. In general, the operating period of a wind power generation facility is 20 years, but it is assumed that repeated stress of about 200 million times will act in the last 20 years.
このような風力発電設備１７の塔体１９は、図７に示すように、鋼管端部に形成された内向きの上水平フランジ部５と下水平フランジ部３（断面Ｌ型フランジ）をボルト２３及びナット２５によってボルト接合されて形成されている。このため、塔体１９に風荷重が作用した場合、図８に示すように、風上側ではフランジ部が開くような挙動となり（図８（ａ）参照）、他方風下側ではフランジ部に押し付け力が作用する（図８（ｂ）参照）。
この場合、図８（ａ）に示す塔体１９の風上側では、ボルト２３にフランジ端部を支点とした“てこ反力”により繰り返し応力が発生する。
内向きフランジ（断面Ｌ型フランジ）では、この“てこ反力”がボルト２３に作用するという特徴があり、フランジ部分の幅が大きい場合、力点と支点の距離が長くなるため、“てこ反力”が大きくなる。
As shown in FIG. 7, the tower body 19 of such a wind power generation equipment 17 has an inwardly facing upper horizontal flange portion 5 and lower horizontal flange portion 3 (L-shaped flanges in section) formed at the end of the steel pipe by bolts 23. And a bolt 25 by a nut 25. For this reason, when a wind load is applied to the tower 19, as shown in FIG. 8, the flange portion opens on the windward side (see FIG. 8A), and on the other side, the pressing force is applied to the flange portion. Acts (see FIG. 8B).
In this case, on the windward side of the tower body 19 shown in FIG. 8A, the bolt 23 is repeatedly stressed by a “leverage reaction force” with the flange end portion as a fulcrum.
An inward flange (L-shaped flange) has a feature that this “leverage reaction force” acts on the bolt 23. When the flange portion is wide, the distance between the force point and the fulcrum becomes longer. "Becomes larger.
このような“てこ反力”が原因で、設計で想定した以上の応力集中あるいは繰り返し応力によりボルトが疲労破壊し、風力発電設備の倒壊に繋がった事例が多く存在する。特に、卓越風向が特定される地形における風力発電設備では、塔体の特定の箇所のフランジ接合部にあるボルトに応力が集中するため、ボルトの疲労破壊は局所的に発生する。 Due to such “leverage reaction force”, there are many cases where the bolts are fatigued and destroyed due to stress concentration or repetitive stress exceeding that assumed in the design, leading to collapse of the wind power generation equipment. In particular, in a wind power generation facility on the terrain where the prevailing wind direction is specified, the stress is concentrated on the bolt at the flange joint portion at a specific portion of the tower body, so that fatigue failure of the bolt occurs locally.
ボルト疲労破壊の発生時には、新規ボルトへの取替えを行うことになるが、疲労破壊の発生は特定箇所に集中することが想定され、それ故に、新規ボルトへの取替え後も、同じ箇所で疲労破壊が繰り返し発生することが懸念される。 When a bolt fatigue failure occurs, it will be replaced with a new bolt, but it is assumed that the occurrence of fatigue failure will be concentrated at a specific location, and therefore after the replacement with a new bolt, fatigue failure will occur at the same location. There is a concern that this may occur repeatedly.
そこで、このような疲労破壊が生ずる特定のフランジ接合部に対して補強する必要があり、その補強方法として、例えば特許文献１に開示されたフランジ補強治具を適用した補強方法が考えられる。
しかしながら、この補強方法は補強部材をボルト、ワイヤやベルト等の締付部材によって固定する必要があり、確実な締付力を発揮するには、適切な締付力の管理が必要になる。
また、締付力の増加に伴い、応力状態が変化するため、既設のボルト内に生じる応力を簡易的に評価することは難しくなる。
また、過度な締め付けをした場合には、既設のボルトが負担する応力がなくなり、補強材の疲労破壊が生じる可能性もある。
Therefore, it is necessary to reinforce a specific flange joint where such fatigue failure occurs, and a reinforcing method using a flange reinforcing jig disclosed in, for example, Patent Document 1 can be considered as a reinforcing method.
However, in this reinforcing method, it is necessary to fix the reinforcing member with a tightening member such as a bolt, a wire, or a belt, and in order to exert a reliable tightening force, it is necessary to appropriately manage the tightening force.
Moreover, since the stress state changes as the tightening force increases, it is difficult to simply evaluate the stress generated in the existing bolt.
In addition, when excessive tightening is performed, the stress borne by the existing bolt is lost, and fatigue failure of the reinforcing material may occur.
また、風力発電設備の塔体のように大径の円筒管におけるボルト接合部には、必要な耐力を確保するために多数のボルトが使用される。特に、近年は風力発電設備の大型化により、必要な耐力は高まり、ボルト本数が増加する傾向にある。多数のボルトで構成される接合部にそれぞれ補強材を取り付けるには多くの工数が必要になる。 In addition, a large number of bolts are used at bolt joints in large-diameter cylindrical tubes such as towers of wind power generation facilities in order to ensure the necessary proof stress. In particular, in recent years, with the increase in the size of wind power generation facilities, the required proof stress has increased and the number of bolts has increased. A lot of man-hours are required to attach the reinforcing material to the joints composed of a large number of bolts.
本発明は、かかる課題を解決するためになされたものであり、締付部材が不要で締め付け力等の管理の必要がなく、適切な疲労強度の向上ができ、また多くの工数を必要とせずに取り付けができるフランジ接合部補強治具を提供することを目的としている。 The present invention has been made in order to solve such a problem, does not require a tightening member, does not require management of a tightening force, etc., can improve an appropriate fatigue strength, and does not require many man-hours. An object of the present invention is to provide a flange joint reinforcing jig that can be attached to a flange.
（１）本発明に係るフランジ接合部補強治具は、下側の鋼管の端部に設けられた下水平フランジ部と、上側の鋼管の端部に設けられた上水平フランジ部をボルト及びナットによって接合して前記鋼管同士を接合したタワー構造体におけるフランジ接合部を補強するフランジ接合部補強治具であって、
基端側に前記ボルトが挿通されるボルト挿通孔を有すると共に前記上水平フランジ部のフランジ面に配置されたときに先端側が前記上水平フランジ部の端部よりも延出する平板状の上片部と、基端側に前記ボルトが挿通されるボルト挿通孔を有すると共に前記下水平フランジ部のフランジ面に配置されたときに先端側が前記下水平フランジ部の端部よりも延出する平板状の下片部と、一端側が前記上片部の先端側に連続し、他端側が前記下片部の先端側に連続しており、前記上水平フランジ部と前記下水平フランジ部の基部が上下方向に離れたときに前記下片部の基端側と前記上片部の基端側が離れようとするのに抵抗する縦片部とを備えてなることを特徴とするものである。
(1) A flange joint reinforcing jig according to the present invention includes a lower horizontal flange portion provided at an end portion of a lower steel pipe and an upper horizontal flange portion provided at an end portion of an upper steel pipe by bolts and nuts. A flange joint reinforcing jig for reinforcing the flange joint in the tower structure joined by the steel pipes,
A flat plate-like upper piece having a bolt insertion hole through which the bolt is inserted on the base end side and having a distal end side extending from the end portion of the upper horizontal flange portion when arranged on the flange surface of the upper horizontal flange portion And a flat plate shape having a bolt insertion hole through which the bolt is inserted on the base end side and a distal end side extending from the end of the lower horizontal flange portion when arranged on the flange surface of the lower horizontal flange portion The lower piece portion and one end side are continuous with the distal end side of the upper piece portion, the other end side is continuous with the distal end side of the lower piece portion, and the base portions of the upper horizontal flange portion and the lower horizontal flange portion are vertically It is characterized by comprising a longitudinal piece portion that resists when the proximal end side of the lower piece portion and the proximal end side of the upper piece portion are about to separate when separated in the direction.
（２）また、上記（１）に記載のものにおいて、前記縦片部は連続する部材からなることを特徴とするものである。 (2) Further, in the above-described (1), the vertical piece is formed of a continuous member.
（３）また、上記（１）に記載のものにおいて、前記縦片部は、隙間によって分離されており、前記上水平フランジ部と前記下水平フランジ部の基部が上下方向に離れたときに前記隙間が閉じられて前記対向面が当接可能になっていることを特徴とするものである。 (3) Further, in the above-described (1), the vertical piece portion is separated by a gap, and the base portion of the upper horizontal flange portion and the lower horizontal flange portion is separated in the vertical direction. The gap is closed so that the opposing surface can come into contact.
（４）また、上記（１）乃至（３）のいずれかに記載のものにおいて、全体形状が、側面視でＵ字又はコ字状であることを特徴とするものである。 (4) Moreover, in the thing in any one of said (1) thru | or (3), the whole shape is a U-shape or a U-shape by side view, It is characterized by the above-mentioned.
本発明に係るフランジ接合部補強治具は、基端側にボルトが挿通されるボルト挿通孔を有すると共に上水平フランジ部のフランジ面に配置されたときに先端側が前記上水平フランジ部の端部よりも延出する平板状の上片部と、基端側に前記ボルトが挿通されるボルト挿通孔を有すると共に下水平フランジ部のフランジ面に配置されたときに先端側が前記下水平フランジ部の端部よりも延出する平板状の下片部と、一端側が前記上片部の先端側に連続し、他端側が前記下片部の先端側に連続しており、前記上水平フランジ部と前記下水平フランジ部の基部が上下方向に離れたときに前記下片部の基端側と前記上片部の基端側が離れようとするのに抵抗する縦片部とを備えてなることにより、締付部材が不要で締め付け力等の管理の必要のない簡易な治具により適切な疲労強度の向上ができ、また多くの工数を必要とせずに取り付けができる。 The flange joint reinforcing jig according to the present invention has a bolt insertion hole through which a bolt is inserted on the base end side, and the tip side is the end of the upper horizontal flange portion when arranged on the flange surface of the upper horizontal flange portion. A flat plate-like upper piece portion that extends further, a bolt insertion hole through which the bolt is inserted on the proximal end side, and a distal end side of the lower horizontal flange portion when disposed on the flange surface of the lower horizontal flange portion A flat plate-like lower piece portion extending from the end portion, one end side is continuous to the distal end side of the upper piece portion, the other end side is continued to the distal end side of the lower piece portion, and the upper horizontal flange portion and By including a vertical piece portion that resists when the base end side of the lower piece portion and the base end side of the upper piece portion are about to leave when the base portion of the lower horizontal flange portion is separated in the vertical direction. No need for tightening members and management of tightening force etc. Can improve the appropriate fatigue strength by Do jig, also it can be mounted without requiring a lot of man-hours.
［実施の形態１］
本発明の実施の形態１に係るフランジ接合部補強治具は、下側の鋼管の端部に設けられた下水平フランジ部３と、上側の鋼管の端部に設けられた上水平フランジ部５をボルト２３及びナット２５によって接合（図７参照）して鋼管同士を接合したタワー構造体におけるボルト接合部を補強するものである。
本実施の形態のフランジ接合部補強治具１は、図１、図２に示すように、厚板状の部材を押し曲げ加工して形成されたものであり、全体形状が側面視でコ字状をしており、上水平フランジ部５のフランジ面側に配置される上片部７と、下水平フランジ部３側に配置される下片部９と、一端側が上片部７に連続すると共に他端側が下片部９に連続する縦片部１１を備えている。
鋼管同士をフランジ接合したタワー構造体としては、上述した風力発電設備１７の塔体１９の他、橋脚、鋼製煙突などが挙げられる。
以下、上片部７、下片部９及び縦片部１１の詳細を説明する。
[Embodiment 1]
The flange joint reinforcing jig according to Embodiment 1 of the present invention includes a lower horizontal flange portion 3 provided at an end portion of a lower steel pipe and an upper horizontal flange portion 5 provided at an end portion of an upper steel pipe. Are joined by bolts 23 and nuts 25 (see FIG. 7) to reinforce the bolt joints in the tower structure in which the steel pipes are joined together.
As shown in FIGS. 1 and 2, the flange joint reinforcing jig 1 of the present embodiment is formed by pressing and bending a thick plate-like member, and the overall shape is a U shape in a side view. The upper piece portion 7 is arranged on the flange surface side of the upper horizontal flange portion 5, the lower piece portion 9 is arranged on the lower horizontal flange portion 3 side, and one end side is continuous with the upper piece portion 7. In addition, the other end side is provided with a vertical piece portion 11 that is continuous with the lower piece portion 9.
Examples of the tower structure in which the steel pipes are flange-joined include a bridge pier, a steel chimney, and the like in addition to the tower body 19 of the wind power generation equipment 17 described above.
Hereinafter, the details of the upper piece 7, the lower piece 9, and the vertical piece 11 will be described.
＜上片部＞
上片部７は、図２に示すように、矩形の平板状をしており、基端側にボルト１３が挿通されるボルト挿通孔１５を有すると共に上水平フランジ部５のフランジ面に配置されたときに先端側が上水平フランジ部５の端部よりも延出するように形成されている。
なお、上片部７の基端側とは、フランジ接合部補強治具１をタワー構造体におけるボルト接合部に設置した状態で上水平フランジ部５の基部側になる側をいい、上片部７の先端側とは、同様の状態で上水平フランジ部５の先端側になる側をいう。
<Upper piece>
As shown in FIG. 2, the upper piece portion 7 has a rectangular flat plate shape, has a bolt insertion hole 15 through which the bolt 13 is inserted on the base end side, and is disposed on the flange surface of the upper horizontal flange portion 5. The tip end side is formed so as to extend beyond the end of the upper horizontal flange portion 5 when it is bent.
In addition, the base end side of the upper piece part 7 means the side which becomes the base side of the upper horizontal flange part 5 in a state where the flange joint reinforcing jig 1 is installed at the bolt joint part in the tower structure. The front end side of 7 means the side that becomes the front end side of the upper horizontal flange portion 5 in the same state.
ボルト挿通孔１５は２個形成されている。
なお、ボルト挿通孔１５に挿通されるボルト１３は、タワー構造体の下水平フランジ部３と上水平フランジ部５を固定するボルト２３と同径で、長さが長いものである。そして、大型の風力発電設備の場合、ボルト径は30〜50mmであるため、ボルト挿通孔１５に挿通されるボルト１３はこのボルト径と同径のものであることが必要である。
Two bolt insertion holes 15 are formed.
The bolt 13 inserted through the bolt insertion hole 15 has the same diameter and a long length as the bolt 23 that fixes the lower horizontal flange portion 3 and the upper horizontal flange portion 5 of the tower structure. And in the case of a large-scale wind power generation facility, since the bolt diameter is 30 to 50 mm, the bolt 13 inserted into the bolt insertion hole 15 needs to have the same diameter as this bolt diameter.
＜下片部＞
下片部９は、図２に示すように、上片部７と同様に、矩形の平板状をしており、基端側にボルト１３が挿通されるボルト挿通孔１５を有すると共に下水平フランジ部３のフランジ面に配置されたときに先端側が下水平フランジ部３の端部よりも延出するように形成されている。
なお、下片部９の基端側とは、フランジ接合部補強治具１をタワー構造体におけるボルト接合部に設置した状態で下水平フランジ部３の基部側になる側をいい、下片部９の先端側とは、同様の状態で下水平フランジ部３の先端側になる側をいう。
ボルト挿通孔１５は、上片部７と同様に２個形成されており、その径も上片部７のボルト挿通孔１５と同じである。
<Lower part>
As shown in FIG. 2, the lower piece portion 9 has a rectangular flat plate shape like the upper piece portion 7, and has a bolt insertion hole 15 through which the bolt 13 is inserted on the base end side and a lower horizontal flange. When arranged on the flange surface of the portion 3, the tip end side is formed to extend beyond the end portion of the lower horizontal flange portion 3.
The base end side of the lower piece portion 9 refers to the side that becomes the base side of the lower horizontal flange portion 3 in a state where the flange joint reinforcing jig 1 is installed at the bolt joint portion in the tower structure. The leading end side of 9 is the side that becomes the leading end side of the lower horizontal flange portion 3 in the same state.
Two bolt insertion holes 15 are formed in the same manner as the upper piece 7, and the diameter thereof is the same as the bolt insertion hole 15 of the upper piece 7.
＜縦片部＞
縦片部１１は、一端側が上片部７の先端側に連続すると共に他端側が下片部９の先端側に連続している。縦片部１１は、フランジ接合部補強治具１を設置した状態において、上水平フランジ部５と下水平フランジ部３の基部が上下方向に離れたときに下片部９の基端側と上片部７の基端側が離れようとするのに抵抗する機能を有する。
本実施の形態の縦片部１１は、図２に示すように、平板状に形成されている。
<Vertical piece>
The vertical piece portion 11 has one end side continuous with the tip end side of the upper piece portion 7 and the other end side continuous with the tip end side of the lower piece portion 9. The vertical piece portion 11 is located on the base end side of the lower piece portion 9 and the upper side when the base portions of the upper horizontal flange portion 5 and the lower horizontal flange portion 3 are separated in the vertical direction in a state where the flange joint reinforcing jig 1 is installed. It has a function of resisting that the base end side of the piece 7 is about to be separated.
The vertical piece part 11 of this Embodiment is formed in flat form, as shown in FIG.
フランジ接合部補強治具１は、図１、図２に示すように、側面視でコ字状をしているが、例えば補強対象のタワー構造体が大型の風力発電設備の場合、ボルト径は30〜50mmであり、上水平フランジ部５、下水平フランジ部３のフランジ幅はボルト径の2〜4倍、上水平フランジ部５及び下水平フランジ部３を重ねた厚さは200mm程度であるため、これに設置できる断面を有していることが好ましい。 As shown in FIG. 1 and FIG. 2, the flange joint reinforcing jig 1 has a U shape in a side view. For example, when the tower structure to be reinforced is a large wind power generation facility, the bolt diameter is The flange width of the upper horizontal flange portion 5 and the lower horizontal flange portion 3 is 2 to 4 times the bolt diameter, and the thickness of the upper horizontal flange portion 5 and the lower horizontal flange portion 3 overlapped is about 200 mm. Therefore, it is preferable to have a cross section that can be installed in this.
＜取り付け方法＞
上記のように構成された本実施の形態に係るフランジ接合部補強治具１の取り付け方法を説明する。
フランジ接合部を接合するボルト１３を取り外し、コ字状のフランジ接合部補強治具１の基端側をフランジ接合部に挿入する。
そして、フランジ接合部のボルト孔と、フランジ接合部補強治具１における上片部７及び下片部９のボルト挿通孔１５を位置合わせして、ボルト接合する。このとき、ボルト１３の締め付け力の管理は、タワー構造体のフランジ接合部のボルト締付力と同等にすればよい。
<Mounting method>
A method of attaching the flange joint reinforcing jig 1 according to the present embodiment configured as described above will be described.
The bolt 13 that joins the flange joint is removed, and the base end side of the U-shaped flange joint reinforcement jig 1 is inserted into the flange joint.
And the bolt hole of a flange junction part and the bolt insertion hole 15 of the upper piece part 7 and the lower piece part 9 in the flange junction part reinforcement jig | tool 1 are aligned, and it bolts. At this time, the management of the tightening force of the bolt 13 may be equivalent to the bolt tightening force of the flange joint portion of the tower structure.
＜作用の説明＞
風荷重が作用すると、上述したように、上水平フランジ部５及び下水平フランジ部３の端部を支点とする“てこの原理”によって上水平フランジ部５及び下水平フランジ部３は変形し、上水平フランジ部５と下水平フランジ部３の基部が開く。基部が開くと、上片部７の基部側が持ち上げられ、逆に下片部９の基部側が押し下げられる。このとき、縦片部１１が上記の動きに抵抗する作用を発揮し、ボルト１３に作用する引っ張り力の一部を負担し、ボルト１３に作用する引張り応力が緩和され、ボルト１３の疲労強度を向上させることができる。
<Description of action>
When the wind load is applied, as described above, the upper horizontal flange portion 5 and the lower horizontal flange portion 3 are deformed by the “leverage principle” using the ends of the upper horizontal flange portion 5 and the lower horizontal flange portion 3 as fulcrums, The bases of the upper horizontal flange portion 5 and the lower horizontal flange portion 3 are opened. When the base is opened, the base side of the upper piece 7 is lifted, and conversely, the base side of the lower piece 9 is pushed down. At this time, the vertical piece portion 11 exerts the action of resisting the above movement, bears a part of the tensile force acting on the bolt 13, the tensile stress acting on the bolt 13 is relieved, and the fatigue strength of the bolt 13 is increased. Can be improved.
また、本実施の形態では、既設のフランジ部分を修正することなくフランジ接合部の疲労強度を向上させることが可能であり、フランジ全体の再設計が不要であるため、簡易にフランジ接合部の疲労強度を向上させることができる。
また、使用するボルト１３は、既設のボルトと同径のものを用いればよく、ボルト再選定についても煩雑な作業が不要である。
Further, in the present embodiment, it is possible to improve the fatigue strength of the flange joint without modifying the existing flange portion, and it is not necessary to redesign the entire flange. Strength can be improved.
Moreover, what is necessary is just to use the thing of the same diameter as the existing volt | bolt as the volt | bolt 13 to be used, and a complicated operation | work is unnecessary also about bolt re-selection.
また、特許文献１に示された従来の方法では、(a)補強部材および締付部材の製作・設計、(b)補強部材および締付部材の取り付け、(c)締付部材の締付力の導入、(d)締付力の確認といった工程が必要になる。
これに対して、本発明では、(a)フランジ接合部補強治具の製作・設計、(b)フランジ接合部補強治具の取り付けといった工程のみでフランジ接合部の疲労強度を向上させることができ、従来の方法に比較して工数を少なくできるという効果がある。
また、締付部材を必要としないことで、工数を削減可能なことに加え、締め付け力の管理が不要となることで、極めて簡易な取り付けを可能にしている。
Further, in the conventional method disclosed in Patent Document 1, (a) production and design of a reinforcing member and a fastening member, (b) attachment of the reinforcing member and the fastening member, and (c) fastening force of the fastening member. And (d) confirmation of tightening force is required.
On the other hand, in the present invention, the fatigue strength of the flange joint can be improved only by the steps of (a) production / design of the flange joint reinforcement jig and (b) attachment of the flange joint reinforcement jig. There is an effect that man-hours can be reduced as compared with the conventional method.
Further, since no tightening member is required, man-hours can be reduced, and management of the tightening force is not required, thereby enabling extremely simple attachment.
風力発電設備のように風向が特定されて応力の集中が偏る場合、破損ボルトを新規ボルトに更新しただけでは、再び同じ箇所で疲労破壊が発生すると考えられる。本実施の形態のフランジ接合部補強治具１ではより簡易的に疲労強度を向上することが可能であるため、新規ボルトの設置時に併せて本発明に係るフランジ接合部補強治具１を設置することで同じ箇所での疲労破壊の発生を防止できる。 When the wind direction is specified and the stress concentration is biased as in a wind power generation facility, it is considered that fatigue failure will occur again at the same location just by replacing the damaged bolt with a new bolt. Since the flange joint reinforcement jig 1 according to the present embodiment can more easily improve the fatigue strength, the flange joint reinforcement jig 1 according to the present invention is installed at the time of installing a new bolt. This can prevent the occurrence of fatigue failure at the same location.
また、本実施の形態のフランジ接合部補強治具１は、破損箇所の範囲に合わせた合理的な補強が可能であり、特に風力発電設備は、その大型化に伴い、複数のボルト１３を使用する構造になっているが、本実施の形態のフランジ接合部補強治具１を用いた局所的な補強は極めて有効な補強方法となる。 Further, the flange joint reinforcing jig 1 according to the present embodiment can be reasonably reinforced according to the range of the damaged portion, and in particular, the wind power generation facility uses a plurality of bolts 13 as its size increases. However, local reinforcement using the flange joint reinforcing jig 1 of the present embodiment is an extremely effective reinforcement method.
なお、上記の説明では、フランジ接合部補強治具１の側面視の形状としてコ字状のものを例に挙げて説明したが、本発明のフランジ接合部補強治具１は上片部７、下片部９及び縦片部１１から形成されるものであれば形状はこれに限定されるものではなく、例えば図３に示すような側面視がＵ字状のものであってもよい。この場合、縦片部１１は平板状ではなく湾曲状に形成されている。
また、縦片部１１を平板状とする場合でも、縦片部１１と上片部７との接続面及び縦片部１１と下片部９との接続面は、直角とせずに、曲率半径が板厚の５０％程度の湾曲面によって連続させることが、応力集中の発生を避けるために好ましい。
In the above description, the flange joint reinforcing jig 1 has been described by taking the U-shaped shape as an example of the side view of the flange joint reinforcing jig 1, but the flange joint reinforcing jig 1 of the present invention includes the upper piece portion 7, The shape is not limited to this as long as it is formed from the lower piece portion 9 and the vertical piece portion 11. For example, a side view as shown in FIG. 3 may be U-shaped. In this case, the vertical piece portion 11 is formed in a curved shape instead of a flat plate shape.
Further, even when the vertical piece portion 11 has a flat plate shape, the connection surface between the vertical piece portion 11 and the upper piece portion 7 and the connection surface between the vertical piece portion 11 and the lower piece portion 9 do not have a right angle, but a radius of curvature. Is preferably continuous with a curved surface of about 50% of the plate thickness in order to avoid the occurrence of stress concentration.
［実施の形態２］
実施の形態２のフランジ接合部補強治具１６を図４に基づいて説明する。なお、図４において、図１と同一部分には同一の符号を付してある。
本実施の形態のフランジ接合部補強治具１６は、縦片部１１が隙間Ｓによって上縦片部１１ａと下縦片部１１ｂに分離されており、上水平フランジ部５と下水平フランジ部３の基部が上下方向に離れたときに隙間Ｓが閉じられて隙間Ｓを介して対向する上縦片部１１ａと下縦片部１１ｂの対向面が当接可能になっている。
[Embodiment 2]
The flange joint reinforcement jig 16 according to the second embodiment will be described with reference to FIG. In FIG. 4, the same parts as those in FIG.
In the flange joint reinforcing jig 16 of the present embodiment, the vertical piece portion 11 is separated into an upper vertical piece portion 11a and a lower vertical piece portion 11b by a gap S, and the upper horizontal flange portion 5 and the lower horizontal flange portion 3 are separated. The gap S is closed when the base of the upper part is separated in the vertical direction, and the opposing surfaces of the upper vertical piece part 11a and the lower vertical piece part 11b facing each other through the gap S can be brought into contact with each other.
縦片部１１に隙間Ｓを設けることで、以下に示すような「設計、製造上の効果」及び「機能面での効果」を奏することができる。
＜設計、製造上の効果＞
実施の形態１の場合、上片部７と下片部９の離間距離は補強対象としているフランジ接合部の厚みと同等に設定する必要がある。これに対して、実施の形態２のものでは、隙間Ｓがあるため、上記の離間距離を厳密に設定する必要がなく、製造が容易である。
By providing the gap S in the vertical piece portion 11, the following “design and manufacturing effects” and “functional effects” can be achieved.
<Effects on design and manufacturing>
In the case of Embodiment 1, it is necessary to set the separation distance between the upper piece 7 and the lower piece 9 to be equal to the thickness of the flange joint to be reinforced. On the other hand, in the second embodiment, since there is a gap S, it is not necessary to set the above separation distance strictly, and the manufacturing is easy.
＜機能面での効果＞
風荷重が作用すると、上述したように、上水平フランジ部５及び下水平フランジ部３の端部を支点とする“てこの原理”によって上水平フランジ部５及び下水平フランジ部３は変形し、上水平フランジ部５と下水平フランジ部３の基部が開く。基部が開くと、上片部７の基部側が持ち上げられ、逆に下片部９の基部側が押し下げられ、その結果、上縦片部１１ａと下縦片部１１ｂが互いに近づき、隙間Ｓの隙間距離が小さくなる。
<Functional effects>
When the wind load is applied, as described above, the upper horizontal flange portion 5 and the lower horizontal flange portion 3 are deformed by the “leverage principle” using the ends of the upper horizontal flange portion 5 and the lower horizontal flange portion 3 as fulcrums, The bases of the upper horizontal flange portion 5 and the lower horizontal flange portion 3 are opened. When the base portion is opened, the base portion side of the upper piece portion 7 is lifted, and conversely, the base portion side of the lower piece portion 9 is pushed down. As a result, the upper vertical piece portion 11a and the lower vertical piece portion 11b approach each other, and the gap distance of the gap S Becomes smaller.
しかし、前記基部の開き量が少ない状態では、隙間Ｓの隙間距離が縮まるだけで上縦片部１１ａと下縦片部１１ｂは当接しないのでフランジ接合部補強治具１６には応力が作用することはない。
このように、風荷重が小さい状態ではフランジ接合部補強治具１６に応力は作用せず、ボルト１３のみに応力が作用するので、フランジ接合部補強治具１６に常時応力が作用することはなく、フランジ接合部補強治具１６の疲労破壊を防止できる。
However, in a state where the opening amount of the base portion is small, the upper vertical piece portion 11a and the lower vertical piece portion 11b are not brought into contact with each other only by reducing the gap distance of the gap S, so that stress acts on the flange joint reinforcing jig 16. There is nothing.
In this way, when the wind load is small, no stress is applied to the flange joint reinforcing jig 16 and only the bolt 13 is stressed. Therefore, no stress is always applied to the flange joint reinforcing jig 16. Further, fatigue failure of the flange joint reinforcing jig 16 can be prevented.
風荷重が大きくなり前記基部の開き量が大きくなり、上縦片部１１ａと下縦片部１１ｂがさらに近づいて隙間Ｓが閉じられると、上縦片部１１ａと下縦片部１１ｂの対向面が互いに当接して圧縮力を伝達する。
上縦片部１１ａと下縦片部１１ｂが圧縮力を伝達することで、ボルト１３に作用する引張り応力が緩和され、ボルト１３の疲労強度の向上を図ることができる。
When the wind load increases and the opening amount of the base portion increases, and the upper vertical piece portion 11a and the lower vertical piece portion 11b further approach each other and the gap S is closed, the opposing surfaces of the upper vertical piece portion 11a and the lower vertical piece portion 11b Abut against each other to transmit the compressive force.
When the upper vertical piece portion 11a and the lower vertical piece portion 11b transmit the compressive force, the tensile stress acting on the bolt 13 is relaxed, and the fatigue strength of the bolt 13 can be improved.
本実施の形態のフランジ接合部補強治具１６においては、上縦片部１１ａと下縦片部１１ｂの対向面の隙間Ｓを調整することで、ボルト１３にどの程度の引張り応力が作用したときにフランジ接合部補強治具１６に応力が作用するかを調整できる。
すなわち、隙間Ｓの隙間距離が小さければボルト１３に作用する引張り応力が小さい状態からフランジ接合部補強治具１６に圧縮応力が作用し、逆に隙間Ｓの隙間距離が大きければボルト１３に作用する引張り応力がある程度大きくなった状態からフランジ接合部補強治具１６に圧縮応力が作用する。
そして、この隙間Ｓをどのように設定するかについては、例えばボルト１３が弾性限度の変形量の50%の変形をしたときに隙間距離がゼロになって、フランジ接合部補強治具１６に応力が作用するように設定するのが好ましい。
本実施の形態では、隙間Ｓの隙間距離を設定することで、多様な疲労強度を実現可能である。
In the flange joint reinforcement jig 16 of the present embodiment, when the tensile stress acts on the bolt 13 by adjusting the clearance S between the opposing surfaces of the upper vertical piece 11a and the lower vertical piece 11b. It is possible to adjust whether the stress acts on the flange joint reinforcing jig 16.
That is, if the gap distance of the gap S is small, the compressive stress acts on the flange joint reinforcing jig 16 from the state where the tensile stress acting on the bolt 13 is small. Conversely, if the gap distance of the gap S is large, it acts on the bolt 13. A compressive stress acts on the flange joint reinforcing jig 16 from a state where the tensile stress has increased to some extent.
As to how to set the gap S, for example, when the bolt 13 is deformed by 50% of the deformation amount of the elastic limit, the gap distance becomes zero, and stress is applied to the flange joint reinforcing jig 16. It is preferable to set so as to act.
In the present embodiment, by setting the gap distance of the gap S, various fatigue strengths can be realized.
なお、隙間Ｓの調整は、上縦片部１１ａ及び／又は下縦片部１１ｂの長さを調整することで容易に調整することができる。 The adjustment of the gap S can be easily adjusted by adjusting the length of the upper vertical piece portion 11a and / or the lower vertical piece portion 11b.
なお、上記の説明では、フランジ接合部補強治具１６の側面視の形状としてコ字状のものを例に挙げて説明したが、本発明のフランジ接合部補強治具１６は上片部７、下片部９及び縦片部１１から形成されるものであれば形状はこれに限定されるものではなく、例えば図５に示すような側面視がＵ字状のものであってもよい。この場合、縦片部１１は平板状ではなく湾曲状に形成されている。
また、実施の形態１と同様に、縦片部１１を平板状とする場合でも、縦片部１１と上片部７との接続面及び縦片部１１と下片部９との接続面は、直角とせずに、曲率半径が板厚の５０％程度の湾曲面によって連続させることが、応力集中の発生を避けるために好ましい。
In the above description, the flange joint reinforcement jig 16 has been described by taking a U-shaped shape as a side view, but the flange joint reinforcement jig 16 of the present invention has the upper piece 7, The shape is not limited to this as long as it is formed from the lower piece portion 9 and the vertical piece portion 11. For example, the shape in a side view as shown in FIG. 5 may be U-shaped. In this case, the vertical piece portion 11 is formed in a curved shape instead of a flat plate shape.
In addition, as in the first embodiment, even when the vertical piece 11 is a flat plate, the connection surface between the vertical piece 11 and the upper piece 7 and the connection surface between the vertical piece 11 and the lower piece 9 are as follows. In order to avoid the occurrence of stress concentration, it is preferable that the curvature radius is continuous with a curved surface having a curvature radius of about 50% of the plate thickness without making a right angle.
上記の説明ではフランジ接合部補強治具１６を押し曲げ加工によって形成する場合について説明したが、フランジ接合部補強治具１６の形成方法はこれに限定されるものではなく、溝形鋼や山形鋼を用いて、押し抜き加工又は切断加工等によって形成してもよい。 In the above description, the case where the flange joint reinforcing jig 16 is formed by pushing and bending has been described. However, the method of forming the flange joint reinforcing jig 16 is not limited to this, and groove steel or angle steel. May be formed by punching or cutting.
１ フランジ接合部補強治具（実施の形態１）
３ 下水平フランジ部
５ 上水平フランジ部
７ 上片部
９ 下片部
１１ 縦片部
１１ａ 上縦片部
１１ｂ 下縦片部
１３ ボルト
１５ ボルト挿通孔
１６ フランジ接合部補強治具（実施の形態２）
１７ 風力発電設備
１９ 塔体
２１ ブレード
２３ ボルト
２５ ナット
Ｓ 隙間
1 Flange joint reinforcement jig (Embodiment 1)
DESCRIPTION OF SYMBOLS 3 Lower horizontal flange part 5 Upper horizontal flange part 7 Upper piece part 9 Lower piece part 11 Vertical piece part 11a Upper vertical piece part 11b Lower vertical piece part 13 Bolt 15 Bolt insertion hole 16 Flange joint reinforcement jig | tool (Embodiment 2) )
17 wind power generation equipment 19 tower body 21 blade 23 bolt 25 nut S gap
Claims (2)
基端側に前記ボルトが挿通されるボルト挿通孔を有すると共に前記上水平フランジ部のフランジ面に配置されたときに先端側が前記上水平フランジ部の端部よりも延出する平板状の上片部と、基端側に前記ボルトが挿通されるボルト挿通孔を有すると共に前記下水平フランジ部のフランジ面に配置されたときに先端側が前記下水平フランジ部の端部よりも延出する平板状の下片部と、一端側が前記上片部の先端側に連続し、他端側が前記下片部の先端側に連続しており、前記上水平フランジ部と前記下水平フランジ部の基部が上下方向に離れたときに前記下片部の基端側と前記上片部の基端側が離れようとするのに抵抗する縦片部とを備えてなり、
前記縦片部は、隙間によって分離されており、前記ボルトが弾性限度の変形量の50%の変形をして前記上水平フランジ部と前記下水平フランジ部の基部が上下方向に離れたときに前記隙間が閉じられて対向面が当接可能になっていることを特徴とするフランジ接合部補強治具。 A flange in a tower structure in which a lower horizontal flange portion provided at an end portion of a lower steel pipe and an upper horizontal flange portion provided at an end portion of an upper steel pipe are joined by bolts and nuts to join the steel pipes together. A flange joint reinforcing jig for reinforcing the joint,
A flat plate-like upper piece having a bolt insertion hole through which the bolt is inserted on the base end side and having a distal end side extending from the end portion of the upper horizontal flange portion when arranged on the flange surface of the upper horizontal flange portion And a flat plate shape having a bolt insertion hole through which the bolt is inserted on the base end side and a distal end side extending from the end of the lower horizontal flange portion when arranged on the flange surface of the lower horizontal flange portion The lower piece portion and one end side are continuous with the distal end side of the upper piece portion, the other end side is continuous with the distal end side of the lower piece portion, and the base portions of the upper horizontal flange portion and the lower horizontal flange portion are vertically Ri Na and a vertical piece that resists the proximal side of the base end side of the lower piece portion upper piece is about to leave when spaced direction,
The vertical piece portion is separated by a gap, and when the bolt is deformed by 50% of the deformation amount of the elastic limit and the base portions of the upper horizontal flange portion and the lower horizontal flange portion are separated in the vertical direction. A flange joint reinforcing jig, wherein the gap is closed and the opposing surfaces can come into contact with each other .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015162139A JP6406168B2 (en) | 2015-08-19 | 2015-08-19 | Flange joint reinforcement jig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015162139A JP6406168B2 (en) | 2015-08-19 | 2015-08-19 | Flange joint reinforcement jig |
Publications (2)
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| JP7245888B2 (en) * | 2017-11-08 | 2023-03-24 | コスモ工機株式会社 | Flange stiffener |
| KR101971829B1 (en) * | 2018-05-03 | 2019-08-13 | 조현일 | Connection apparatus for pipe joint portion and Method for installing the same |
| KR102319617B1 (en) * | 2020-06-04 | 2021-11-01 | 카멜에프앤에스주식회사 | Pipe clamp assembly and guide fence apparatus including the same |
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| US20130180199A1 (en) * | 2012-01-17 | 2013-07-18 | Venkata Krishna Vadlamudi | Flange connection for a wind turbine and method of connecting parts of a wind turbine |
| DK2767654T3 (en) * | 2013-02-19 | 2015-10-26 | Siemens Ag | Flangehjælpemiddel to connect tower sections, adjacent to one another |
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