JP2010078074A - Rust preventive cap integrated bolt temporary fixing nut - Google Patents

Rust preventive cap integrated bolt temporary fixing nut Download PDF

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JP2010078074A
JP2010078074A JP2008247922A JP2008247922A JP2010078074A JP 2010078074 A JP2010078074 A JP 2010078074A JP 2008247922 A JP2008247922 A JP 2008247922A JP 2008247922 A JP2008247922 A JP 2008247922A JP 2010078074 A JP2010078074 A JP 2010078074A
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bolt
fixing nut
temporary fixing
steel plate
bottom steel
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JP4955635B2 (en
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Yoshihiko Nakamura
善彦 中村
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IHI Corp
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IHI Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a risk that the air-tightness of the inside of a rust preventive cap may adversely be affected by a change of a temperature. <P>SOLUTION: This rust preventive cap integrated bolt temporary fixing nut 20 is constituted by attaching an opening side end of a rust preventive cap 25 air-tightly to the other axial end side of a tapered part 22 having one axial end having a smaller diameter than that of a bolt hole 3 of a bottom steel plate 1 and the other axial end side of a bolt temporary fixing nut body 21 having a cylindrical part 23 and forming a groove 26 for cutting in the peripheral direction on an outer peripheral face of a boundary of both the other end sides. The bolt temporary fixing nut body 21 is tightened into a bolt 5 inserted into the bolt hole 3 of the bottom steel plate 1 from below from above, and the tapered part 22 is screwed into a clearance between the bolt hole 3 and the bolt 5 to fix the bolt 5 having a shaft 5a covered with the rust preventive cap 25 temporarily into the bolt hole 3, and to seal a section between the bolt temporary fixing nut body 21 and the bolt hole 3. Paint is applied on a lower face of the bottom steel plate 1 including a head 5b of the bolt to block the bolt 5 from the outside air for rust prevention. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、鋼板同士の重ね合せ部を締結するために一方の鋼板のボルト孔に予めボルトを仮固定すると共に、該仮固定したボルトの発錆を未然に防止するために用いる防錆キャップ一体式ボルト仮固定ナットに関するものである。   In the present invention, a bolt is temporarily fixed in advance in a bolt hole of one steel plate in order to fasten the overlapping portion of the steel plates, and a rust preventive cap is used to prevent rusting of the temporarily fixed bolt. The present invention relates to a type bolt temporary fixing nut.

近年、橋梁を構成するための床版としては、床版のコンクリート層の下面を形成する型枠をパネル状の底鋼板として、該底鋼板の内側にコンクリートを直接打設することで、上記底鋼板とコンクリート層とを一体に結合させるようにした形式の合成床版が用いられるようになってきている。   In recent years, as a floor slab for constituting a bridge, the formwork forming the lower surface of the concrete layer of the floor slab is used as a panel-shaped bottom steel plate, and concrete is directly placed inside the bottom steel plate, thereby Synthetic floor slabs of the type in which steel plates and concrete layers are joined together have come to be used.

この種の合成床版を架設するには、先ず、主桁上に底鋼板を径間方向に並べて配設した後、隣接する底鋼板同士の連結作業が必要となる。   In order to construct this type of composite floor slab, first, after arranging the bottom steel plates in the radial direction on the main girder, it is necessary to connect the adjacent bottom steel plates.

上記隣接する底鋼板同士を連結する場合、通常は、図５に示す如く、隣接する底鋼板１の突合せ端部同士の上側に添接板２を重ねて配置した状態にて、上記各底鋼板１と添接板２の重ね合わせ部に穿設してあるボルト孔３，４に対し、底鋼板１の下面側からボルト（高力ボルト）５を挿通させる。その後、上記添接板２の上側に突出する上記ボルト５の先端部に、ワッシャ７を嵌めてから、ナット６を螺着させて締め込むことで、鋼板同士の重ね合わせ部としての上記各底鋼板１と添接板２の重ね合わせ部を、ボルト５によりそれぞれ接合し、これにより、隣接する底鋼板１の突合せ端部同士を、上記添接板２を介して連結させるようにしてある。   When connecting the adjacent bottom steel plates, normally, as shown in FIG. 5, the bottom steel plates are arranged in a state where the adjoining plates 2 are arranged on the upper side of the butt ends of the adjacent bottom steel plates 1. Bolts (high-strength bolts) 5 are inserted from the lower surface side of the bottom steel plate 1 into the bolt holes 3 and 4 drilled in the overlapping portion of 1 and the attachment plate 2. After that, the washer 7 is fitted to the tip of the bolt 5 protruding above the attachment plate 2 and then the nut 6 is screwed and tightened so that each of the bottoms as the overlapping portion of the steel plates is secured. The overlapping portions of the steel plate 1 and the attachment plate 2 are joined by bolts 5 so that the butt ends of the adjacent bottom steel plates 1 are connected to each other via the attachment plate 2.

上記のようにしてボルト５を用いて底鋼板１と添接板２の重ね合わせ部を接合する際には、底鋼板１の下面側から上記ボルト孔３，４に挿通させたボルト５が脱落（落下）しないように保持した状態で、添接板２の上側からナット６を螺着させて締め込む必要が生じていた。   When the overlapping portion of the bottom steel plate 1 and the attachment plate 2 is joined using the bolt 5 as described above, the bolt 5 inserted through the bolt holes 3 and 4 from the lower surface side of the bottom steel plate 1 is dropped. It was necessary to screw and tighten the nut 6 from the upper side of the attachment plate 2 while being held so as not to fall.

そこで、上記合成床版の底鋼板１の架設現場における底鋼板の下面側からの作業を解消できるようにするための手法として、上記底鋼板１のボルト孔３に下方より挿通させたボルト５を、上記ボルト孔３の部分に脱落しないように保持させることが考えられてきている。   Therefore, as a technique for eliminating the work from the lower surface side of the bottom steel plate at the construction site of the bottom steel plate 1 of the composite floor slab, a bolt 5 inserted from below into the bolt hole 3 of the bottom steel plate 1 is used. It has been considered that the bolt hole 3 is held so as not to drop off.

図６（イ）（ロ）（ハ）は上記底鋼板１のボルト孔３にボルト５を脱落しないよう保持させるための手段の一例として、従来提案されている引っ掛けリング８を用いた手法を示すものである。   6 (a), 6 (b), and 6 (c) show a method using a conventionally proposed hook ring 8 as an example of means for holding the bolt 5 in the bolt hole 3 of the bottom steel plate 1 so as not to drop off. Is.

上記引っ掛けリング８は、底鋼板１に穿設してあるボルト孔３よりもやや大きい外径寸法を有し、且つ軸心方向の長さ寸法（高さ寸法）を、上記添接板２の板厚よりも小さい寸法としたリング形状の部材の内周面に、上記ボルト５の軸部（ねじ部）５ａに螺着させるための雌ねじ部（図示せず）を設けた構成としてある。これにより、図６（イ）に示す如く、隣接する底鋼板１の突合せ端部に設けてあるボルト孔３に、ボルト５を下方からそれぞれ挿通させた後、該各ボルト５の軸部５ａに、上記引っ掛けリング８を上方からねじ結合により嵌めて、該引っ掛けリング８を上記各底鋼板１のボルト孔３の周りに当てることで、予め、上記各底鋼板１のボルト孔３に、ボルト５を、落下を防止した状態で保持させることができるようにしてある。   The hook ring 8 has a slightly larger outer diameter than the bolt hole 3 formed in the bottom steel plate 1 and has a length dimension (height dimension) in the axial direction of the attachment plate 2. A female screw portion (not shown) for screwing the shaft portion (screw portion) 5a of the bolt 5 is provided on the inner peripheral surface of a ring-shaped member having a dimension smaller than the plate thickness. Thus, as shown in FIG. 6 (a), after the bolts 5 are respectively inserted from below into the bolt holes 3 provided at the butt end portions of the adjacent bottom steel plates 1, the shafts 5a of the respective bolts 5 are inserted into the shaft portions 5a. The hook ring 8 is fitted by screw connection from above, and the hook ring 8 is applied around the bolt hole 3 of each bottom steel plate 1 so that the bolt 5 in the bottom steel plate 1 is bolted in advance. Can be held in a state in which the fall is prevented.

したがって、その後は、図６（ロ）に示すように、上記各底鋼板１の突合せ端部の上側に、上記引っ掛けリング８が通過できる大きさのボルト孔４を穿設してなる添接板２を、該ボルト孔４に上記各底鋼板１のボルト孔３に保持させてあるボルト５を挿通させるようにして上方から載置した後、図６（ハ）に示すように、上記ボルト５に、ワッシャ７を介してナット６を上方から嵌めて添接板２の上側から締め込むことで、各底鋼板１に対する添接板２の接合作業、すなわち、該添接板２を介した上記底鋼板１同士の連結作業を、底鋼板１の上側からの作業のみで実施できるようにしてある（たとえば、特許文献１参照）。   Therefore, thereafter, as shown in FIG. 6 (b), an attachment plate formed by drilling a bolt hole 4 large enough to allow the hook ring 8 to pass above the butt end of each bottom steel plate 1. 2 is placed from above so that the bolt 5 held in the bolt hole 3 of each bottom steel plate 1 is inserted through the bolt hole 4 and then the bolt 5 as shown in FIG. In addition, by fitting the nut 6 from above through the washer 7 and tightening from above the attachment plate 2, the joining operation of the attachment plate 2 to each bottom steel plate 1, that is, the above-described operation via the attachment plate 2 is performed. The connection work of the bottom steel plates 1 can be performed only from the top side of the bottom steel plate 1 (see, for example, Patent Document 1).

ところで、上記のようにして底鋼板１のボルト孔３に仮固定を行ったボルト５は、該仮固定作業の後、底鋼板１を施工現場へ搬入する工程と、底鋼板１を主桁上に径間方向に並べて配設する工程と、隣接する底鋼板１の突合せ端部同士の上側に、添接板２を載置する工程と、更には、該添接板２のボルト孔４の位置を利用して、上記ボルト孔３にボルト５が仮固定してある各底鋼板１の位置を修正する工程とを経て、上記ボルト５に底鋼板１と添接板２を接合するためのナット６を本締めするまでの間、屋外に暴露される。   By the way, the bolt 5 temporarily fixed to the bolt hole 3 of the bottom steel plate 1 as described above includes a step of carrying the bottom steel plate 1 into the construction site after the temporary fixing work, and the bottom steel plate 1 on the main girder. And the step of placing the attachment plate 2 on the upper side of the butted ends of the adjacent bottom steel plates 1, and further, the bolt hole 4 of the attachment plate 2. The position is used to pass the step of correcting the position of each bottom steel plate 1 in which the bolt 5 is temporarily fixed to the bolt hole 3 to join the bottom steel plate 1 and the attachment plate 2 to the bolt 5. Until the nut 6 is fully tightened, it is exposed outdoors.

そのため、上記底鋼板１のボルト孔３へのボルト５の仮固定作業から、現地本締め作業までに期間が空くと、上記ボルト５の軸部に錆が発生する虞があり、上記ボルト５の軸部５ａに錆が発生すると、トルク係数が乱れ、本締め後の軸力が安定しなくなるという問題が懸念される。   Therefore, if there is a period from the temporary fixing operation of the bolt 5 to the bolt hole 3 of the bottom steel plate 1 to the main fastening operation at the site, rust may be generated on the shaft portion of the bolt 5. If rust is generated in the shaft portion 5a, the torque coefficient is disturbed, and there is a concern that the axial force after final tightening becomes unstable.

そこで、従来は、通常、上記底鋼板１に仮固定するボルト５として、プライマーによって予め防錆処理されているボルト５を用いることで、底鋼板１のボルト孔３への仮固定作業から、現地本締め作業までの間に該ボルト５の軸部５ａにおける錆の発生を抑えるようにしていた。   Therefore, conventionally, as the bolt 5 temporarily fixed to the bottom steel plate 1 by using a bolt 5 that has been rust-prevented in advance by a primer, from the temporary fixing operation to the bolt hole 3 of the bottom steel plate 1, Until the final tightening operation, the generation of rust in the shaft portion 5a of the bolt 5 was suppressed.

しかし、上記底鋼板１のボルト孔３に仮固定するボルト５として、予め防錆処理されたボルト５を用いる場合は、橋梁の合成床版の架設に用いられるボルト５の数が膨大であることに起因して、一般のボルト（高力ボルト）を用いる場合に比してコストが大幅に嵩むという問題がある。   However, when the bolt 5 that has been rust-prevented in advance is used as the bolt 5 that is temporarily fixed to the bolt hole 3 of the bottom steel plate 1, the number of bolts 5 that are used for the construction of the composite floor slab of the bridge is enormous. As a result, there is a problem that the cost is significantly increased as compared with the case of using a general bolt (high-strength bolt).

なお、図７に示す如く、２枚の板９，１０の接合に用いられている締結後のボルト１１の軸部１１ａとナット１２の防食（防錆）を行うための手段の１つとしては、ボルト１１の軸部１１ａの先端と側面を覆うねじ被覆部１３ａと、ナット１２を覆う頭部被覆部１３ｂと、ナット１２のつば１２ａを覆うつば被覆部１３ｃと、板９に沿って広がる板被覆部１３ｄからなる防食キャップ１３を、亜鉛粉末入りＰＶＣにより製作して、該防食キャップ１３を、上記ボルト１１の軸部１１ａとナット１２を被覆するように装着させる手法が従来提案されている（たとえば、特許文献２参照）。   In addition, as shown in FIG. 7, as one of the means for performing corrosion prevention (rust prevention) of the shaft part 11a of the bolt 11 and the nut 12 that are used for joining the two plates 9 and 10, A screw covering portion 13a covering the tip and side surfaces of the shaft portion 11a of the bolt 11, a head covering portion 13b covering the nut 12, a collar covering portion 13c covering the collar 12a of the nut 12, and a plate extending along the plate 9 There has been conventionally proposed a method in which the anticorrosion cap 13 including the covering portion 13d is made of PVC containing zinc powder, and the anticorrosion cap 13 is mounted so as to cover the shaft portion 11a and the nut 12 of the bolt 11 ( For example, see Patent Document 2).

そのため、図６（イ）に示したように底鋼板１のボルト孔３に仮固定したボルト５の軸部５ａの防錆を図るための対策として、該ボルト５に、図７に示した如き防食キャップ１３を被せることが考えられる。   Therefore, as shown in FIG. 7, as a measure for preventing rust of the shaft portion 5a of the bolt 5 temporarily fixed to the bolt hole 3 of the bottom steel plate 1 as shown in FIG. It is conceivable to cover the anti-corrosion cap 13.

しかし、上記図７に示した防食キャップ１３は、板被覆部１３ｄと板９との間を密閉できるようにはなっておらず、又、ねじ被覆部１３ａによってボルト１１の軸部１１ａの先端と側面を覆うように装着した状態であっても、ねじの溝に沿って螺旋状の空間部が存在していて、防食対象となるボルトの軸部と外気との接触を遮断して密封できるものではないため、ボルト１１の軸部１１ａの外気や水との接触を阻止して、該軸部１１ａにおける発錆を確実に防止させることは難しい。   However, the anti-corrosion cap 13 shown in FIG. 7 is not designed to be able to seal between the plate covering portion 13d and the plate 9, and the screw covering portion 13a is connected to the tip of the shaft portion 11a of the bolt 11. Even if it is in a state of covering the side, there is a spiral space along the groove of the screw, and it can be sealed by blocking the contact between the shaft part of the bolt to be anticorrosive and the outside air Therefore, it is difficult to prevent the shaft portion 11a of the bolt 11 from coming into contact with the outside air or water to reliably prevent rusting at the shaft portion 11a.

そこで、本発明者は、先の出願（特願２００７−３０２５９６号）にて、２枚の鋼板同士の重ね合わせ部を接合するために上記２枚の重ね合わせ鋼板のうちの一方の鋼板のボルト孔に挿通して仮固定した状態のボルトを、外気との接触を遮断できるようにして、該ボルトの軸部の防錆を行うことができるようにした締結用ボルトの防錆方法及び装置を提案している。   Therefore, the present inventor, in the previous application (Japanese Patent Application No. 2007-302596), in order to join the overlapped portion of the two steel plates, the bolt of one of the two steel plates. A rust prevention method and device for a fastening bolt that allows a bolt in a state of being temporarily fixed by being inserted into a hole to be able to prevent contact with outside air and to prevent rusting of a shaft portion of the bolt. is suggesting.

上記締結用ボルトの防錆装置は、図８（イ）（ロ）（ハ）に示す如く、ボルト５を用いて接合するようにする２枚の重ね合わせ鋼板としての合成床版の底鋼板１と添接板２のうちの一方の鋼板としての底鋼板１のボルト孔３に一側面側としての下面側から挿通させるボルト５の軸部５ａに螺合させた状態で、上記底鋼板１のボルト孔３における他側面側端部としての上面側端部に密着できるようにしてあるボルト仮固定ナット１４と、長手方向一端部が閉塞した筒状として長手方向一端側の胴体部１５ａを上記ボルト５の軸部５ａの先端と側面の周りに被覆するようにしてあり且つ長手方向他端側の開口部１５ｂを、上記ボルト仮固定ナット１４に接触させて該開口部１５ｂと上記ボルト仮固定ナット１４との間を密閉するための防錆キャップ１５とを備えた構成としてある。   As shown in FIGS. 8 (a), (b), and (c), the rust prevention device for the fastening bolt is a bottom steel plate 1 of a composite floor slab as two superposed steel plates that are joined using a bolt 5. In the state where the bottom steel plate 1 is screwed with the shaft portion 5a of the bolt 5 inserted through the bolt hole 3 of the bottom steel plate 1 as one steel plate of the attachment plate 2 from the lower surface side as one side surface side. The bolt temporary fixing nut 14 that can be brought into close contact with the end portion on the upper surface side as the other side surface end portion in the bolt hole 3, and the body portion 15a on the one end side in the longitudinal direction as a cylindrical shape with one end portion in the longitudinal direction closed. 5, the opening 15b on the other end in the longitudinal direction is brought into contact with the bolt temporary fixing nut 14 so that the opening 15b and the bolt temporary fixing nut are covered. Anti-rust cap to seal between 14 A configuration equipped with a 15.

更に、上記ボルト仮固定ナット１４は、外径寸法が底鋼板１に設けてあるボルト孔３よりも細径となる軸心方向の一端部から上記底鋼板１のボルト孔３よりも所要寸法太径となる軸心方向の他端部へ向けて外周面が徐々に拡径するテーパ部１６を備えると共に、該テーパ部１６の軸心方向他端側に、上記テーパ部１６における太径側となる軸心方向他端部の外径よりも所要寸法小さい外径寸法で軸心方向に所要寸法延びる円筒状のキャップ取付部１７の軸心方向一端部が一体に取り付けた構成としてある。   Furthermore, the bolt temporary fixing nut 14 has an outer diameter that is larger than the bolt hole 3 of the bottom steel plate 1 from one end in the axial direction where the outer diameter is smaller than that of the bolt hole 3 provided in the bottom steel plate 1. A taper portion 16 whose outer peripheral surface gradually increases in diameter toward the other end portion in the axial direction as a diameter is provided, and on the other end side in the axial center direction of the taper portion 16, One end in the axial direction of the cylindrical cap mounting portion 17 extending in the axial direction with a required outer diameter smaller than the outer diameter of the other axial end is integrally attached.

上記ボルト仮固定ナット１４の内周面には、上記底鋼板１と添接板２の接合に用いるボルト５の軸部５ａに螺着させるための雌ねじ部１８が設けてある。   On the inner peripheral surface of the bolt temporary fixing nut 14, a female screw portion 18 is provided for screwing onto the shaft portion 5 a of the bolt 5 used for joining the bottom steel plate 1 and the attachment plate 2.

上記ボルト仮固定ナット１４は、所要の弾性変形を許容できるように、たとえば、合成樹脂製、あるいは、黄銅、銅、アルミニウム等、上記底鋼板１及びボルト５に比して柔らかい金属製としてある。   The bolt temporary fixing nut 14 is made of, for example, a synthetic resin or a soft metal such as brass, copper, aluminum, etc., compared to the bottom steel plate 1 and the bolt 5 so as to allow required elastic deformation.

上記防錆キャップ１５は、可撓性を有する樹脂製として、長手方向他端部の開口部１５ｂの内径寸法が、上記ボルト仮固定ナット１４のキャップ取付部１７の外径寸法よりもやや小さくなるようにして、該防錆キャップ１５の開口部１５ｂを、上記ボルト仮固定ナット１４のキャップ取付部１７の外周に被せるようにして取り付けることで、該防錆キャップ１５の開口部１５ｂの内周面と、ボルト仮固定ナット１４のキャップ取付部１７の外周面とを密着させて、該防錆キャップ１５とボルト仮固定ナット１４との間を密閉できるようにしてある。   The rust prevention cap 15 is made of a resin having flexibility, and the inner diameter of the opening 15b at the other end in the longitudinal direction is slightly smaller than the outer diameter of the cap mounting portion 17 of the bolt temporary fixing nut 14. Thus, by attaching the opening 15b of the rust prevention cap 15 so as to cover the outer periphery of the cap attachment part 17 of the bolt temporary fixing nut 14, the inner peripheral surface of the opening 15b of the rust prevention cap 15 is attached. And the outer peripheral surface of the cap mounting portion 17 of the temporary bolt fixing nut 14 are in close contact with each other so that the space between the antirust cap 15 and the temporary bolt fixing nut 14 can be sealed.

更に、上記防錆キャップ１５の胴体部１５ａは、上記ボルト５の軸部５ａの外径より
もやや小さい内径に設定して、該防錆キャップ１５の胴体部１５ａを、ボルト５の軸部５ａに先端側から被せると、該胴体部１５ａの内周面を、長手方向の長い範囲に亘って上記ボルト５の軸部５ａの外周に密着させることができて、この軸心方向の長い範囲に亘ってボルト５の軸部５ａの外周に密着する胴体部１５ａにより、上記防錆キャップ１５をボルト５に装着した状態で保持するための強い保持力を発揮させることができるようにしてある。 Further, the body portion 15 a of the rust prevention cap 15 is set to have an inner diameter slightly smaller than the outer diameter of the shaft portion 5 a of the bolt 5, and the body portion 15 a of the rust prevention cap 15 is changed to the shaft portion 5 a of the bolt 5. If it covers from the front end side, the inner peripheral surface of the body part 15a can be brought into close contact with the outer periphery of the shaft part 5a of the bolt 5 over a long range in the longitudinal direction. A strong holding force for holding the rust preventive cap 15 in a state where the rust preventive cap 15 is attached to the bolt 5 can be exerted by the body portion 15a closely attached to the outer periphery of the shaft portion 5a of the bolt 5.

以上の構成としてあるボルト仮固定ナット１４と防錆キャップ１５を使用して、上記２枚の重ね合わせ鋼板としての合成床版の底鋼板１と添接板２の接合に用いるボルト５を、上記底鋼板１のボルト孔３に仮止めした状態で防錆する場合は、工場等にて、図８（イ）に示す如く、上記底鋼板１のボルト孔３に、下方よりボルト（高力ボルト）５、たとえば、トルシア型のボルト５を挿通させて配置した後、該ボルト５の軸部５ａに、上記ボルト仮固定ナット１４を、テーパ部１６が設けてある軸心方向の一端部側より嵌めて雌ねじ部１８を螺着させる。その後、上記ボルト仮固定ナット１４を、上記ボルト５に対して締め込むことにより、ボルト仮固定ナット１４の上記ボルト５に対する締付け軸力を利用して、該ボルト仮固定ナット１４のテーパ部１６を、細径側となる一端部より、上記底鋼板１のボルト孔３の上端部とボルト５との隙間にねじ込んで楔状に食い込ませるようにする。これにより、上記ボルト仮固定ナット１４より上記ボルト５に強い締付け軸力を作用させることができ、該ボルト仮固定ナット１４とボルト５との間には、大きな摩擦力が発生するようになる。又、上記ボルト仮固定ナット１４は、上記ボルト５に作用させる強い締付け軸力により、テーパ部１６における本来上記底鋼板１のボルト孔３と同径となる位置よりも太径となる部分まで、上記ボルト孔３とボルト５との隙間に強制的に楔状に食い込まされることで、該底鋼板１のボルト孔３とボルト５との隙間において圧縮弾性変形され、その復元力により、該ボルト仮固定ナット１４のテーパ部１６の外周面が、上記底鋼板１のボルト孔３の上端部の内周面に、周方向の全周に亘り強く密着するため、該ボルト仮固定ナット１４と上記底鋼板１のボルト孔３との間にも大きな摩擦力が生じる。よって、上記ボルト５が、上記底鋼板１のボルト孔３に、該ボルト孔３とボルト仮固定ナット１４の間の大きな摩擦力、及び、該ボルト仮固定ナット１４とボルト５の間の大きな摩擦力によって回転が防止された状態で仮固定されるようにしてある。   Using the bolt temporary fixing nut 14 and the rust prevention cap 15 having the above-described configuration, the bolt 5 used for joining the bottom steel plate 1 and the splicing plate 2 of the composite floor slab as the two laminated steel plates, When rust prevention is performed in a state of being temporarily fixed to the bolt hole 3 of the bottom steel plate 1, a bolt (high-strength bolt) is applied to the bolt hole 3 of the bottom steel plate 1 from below as shown in FIG. 5) For example, after the torcia-type bolt 5 is inserted and arranged, the bolt temporary fixing nut 14 is placed on the shaft portion 5a of the bolt 5 from one end side in the axial direction where the tapered portion 16 is provided. The female screw part 18 is screwed by fitting. Thereafter, by tightening the bolt temporary fixing nut 14 with respect to the bolt 5, the tightening axial force of the bolt temporary fixing nut 14 against the bolt 5 is used to make the tapered portion 16 of the bolt temporary fixing nut 14. Then, from one end portion on the small diameter side, it is screwed into a gap between the upper end portion of the bolt hole 3 of the bottom steel plate 1 and the bolt 5 to be wedged. As a result, a strong tightening axial force can be applied to the bolt 5 by the bolt temporary fixing nut 14, and a large frictional force is generated between the bolt temporary fixing nut 14 and the bolt 5. Further, the bolt temporary fixing nut 14 is, by a strong tightening axial force acting on the bolt 5, to a portion having a larger diameter than a position where the bolt hole 3 of the bottom steel plate 1 originally has the same diameter in the tapered portion 16, By forcibly biting into the gap between the bolt hole 3 and the bolt 5 in a wedge shape, it is compressed and elastically deformed in the gap between the bolt hole 3 and the bolt 5 of the bottom steel plate 1, and the restoring force causes the temporary bolt. Since the outer peripheral surface of the taper portion 16 of the fixing nut 14 is in close contact with the inner peripheral surface of the upper end portion of the bolt hole 3 of the bottom steel plate 1 over the entire circumference in the circumferential direction, the bolt temporary fixing nut 14 and the bottom A large frictional force is also generated between the bolt holes 3 of the steel plate 1. Therefore, the bolt 5 has a large frictional force between the bolt hole 3 and the bolt temporary fixing nut 14 and a large friction between the bolt temporary fixing nut 14 and the bolt 5 in the bolt hole 3 of the bottom steel plate 1. Temporarily fixed in a state where rotation is prevented by force.

更に、この際、上記したようにボルト仮固定ナット１４のテーパ部１６の外周面が、上記底鋼板１のボルト孔３の上端部の内周面に、周方向の全周に亘り強く密着することに伴い、該ボルト仮固定ナット１４と、上記底鋼板１のボルト孔３の上端部内周面との間（図中のＡ個所）が密閉されるようにしてある。   Further, at this time, as described above, the outer peripheral surface of the tapered portion 16 of the bolt temporary fixing nut 14 strongly adheres to the inner peripheral surface of the upper end portion of the bolt hole 3 of the bottom steel plate 1 over the entire circumference in the circumferential direction. Accordingly, the space between the bolt temporary fixing nut 14 and the inner peripheral surface of the upper end portion of the bolt hole 3 of the bottom steel plate 1 (A portion in the figure) is hermetically sealed.

上記のようにして底鋼板１のボルト孔３に、ボルト５を回転を防止した状態で仮固定した後は、図８（ロ）に示す如く、上記ボルト孔３に上記ボルト仮固定ナット１４を介してボルト５を仮固定してなる底鋼板１の下面側における上記ボルト５の頭部５ｂを含む所要領域、たとえば底鋼板１の下面の全面に、先行塗装となる塗装を施すようにすることで、上記ボルト５の頭部５ｂと、底鋼板１の下面との間（図中のＢ個所）が塗膜１９により密閉されるようにしてある。   After the bolt 5 is temporarily fixed to the bolt hole 3 of the bottom steel plate 1 as described above in a state where rotation is prevented, the temporary bolt fixing nut 14 is inserted into the bolt hole 3 as shown in FIG. The required area including the head 5b of the bolt 5 on the lower surface side of the bottom steel plate 1 temporarily fixed with the bolt 5 interposed therebetween, for example, the entire lower surface of the bottom steel plate 1 is subjected to a coating that is a preceding coating. The space between the head 5b of the bolt 5 and the lower surface of the bottom steel plate 1 (B portion in the figure) is sealed with the coating film 19.

又、上記底鋼板１のボルト孔３に上記ボルト仮固定ナット１４を介して仮固定したボルト５の軸部５ａに、先端側より上記防錆キャップ１５の胴体部１５ａを被せると共に、該防錆キャップ１５の開口部１５ｂを、上記ボルト仮固定ナット１４のキャップ取付部１７に被せて取り付け、これにより、上記防錆キャップ１５の開口部１５ｂと、ボルト仮固定ナット１４との間（図中のＣ個所）が密閉されるようにしてある。   Further, the shaft portion 5a of the bolt 5 temporarily fixed to the bolt hole 3 of the bottom steel plate 1 through the bolt temporary fixing nut 14 is covered with the body portion 15a of the rust prevention cap 15 from the tip side, and the rust prevention The opening 15b of the cap 15 is attached to the cap mounting portion 17 of the bolt temporary fixing nut 14 so that the space between the opening 15b of the rust prevention cap 15 and the bolt temporary fixing nut 14 (in the drawing) C point) is hermetically sealed.

以上により、上記図中のＡ，Ｂ，Ｃの３個所が密閉されることで、上記ボルト５の軸部５ａの外気との接触を遮断して、該ボルト５の軸部５ａの防錆が図られるようにしてある。   By the above, the three portions A, B, and C in the figure are sealed, so that the contact with the outside air of the shaft portion 5a of the bolt 5 is blocked, and the shaft portion 5a of the bolt 5 is prevented from being rusted. As illustrated.

その後、上記のようにして防錆が図られたボルト５がボルト孔３に取り付けてある底鋼板１は、施工現場へ搬入して、該底鋼板１を主桁上に径間方向に並べて配設した後、隣接する底鋼板１の突合せ端部同士の上側に、図８（ハ）に示す如く（図８（ハ）では片方の底鋼板１のみを示してある）、該各底鋼板１のボルト孔３と対応する位置に上記ボルト仮固定ナット１４のテーパ部１６の太径側端部となる軸心方向他端部の外径よりも所要寸法大きなボルト孔４を穿設してなる添接板２を上方から載置して、該添接板２のボルト孔４に、上記底鋼板１のボルト孔３に仮固定してあるボルト５を、それぞれ挿通させるようにし、しかる後、上記添接板２の上方へ突出する上記各ボルト５の軸部５ａに装着されている防錆キャップ１５の一端部をつまんで上方へ引き抜くことで、該防錆キャップ１５の撤去を行った後、該各ボルト５の軸部５ａにワッシャ７を介してナット６を嵌めて、該ナット６をボルト５に対して締め込むことで、上記底鋼板１と添接板２の重ね合わせ部を、ボルト５によりそれぞれ接合する。これにより、隣接する底鋼板１の突合せ端部同士を、上記添接板２を介して連結できるようにしてある。   Thereafter, the bottom steel plate 1 with the bolts 5 rust-prevented as described above attached to the bolt holes 3 is carried into the construction site, and the bottom steel plates 1 are arranged in the span direction on the main girder. After installation, as shown in FIG. 8 (c) (only one bottom steel plate 1 is shown in FIG. 8 (c)) above the butt ends of the adjacent bottom steel plates 1, each bottom steel plate 1 is shown. A bolt hole 4 having a required dimension larger than the outer diameter of the other axial end portion of the taper portion 16 of the bolt temporary fixing nut 14 is formed at a position corresponding to the bolt hole 3. The attachment plate 2 is placed from above, and the bolts 5 temporarily fixed to the bolt holes 3 of the bottom steel plate 1 are inserted into the bolt holes 4 of the attachment plate 2, respectively. One end portion of a rust prevention cap 15 attached to the shaft portion 5a of each bolt 5 projecting upward from the attachment plate 2 is After removing the rust prevention cap 15 by pulling it upward, the nut 6 is fitted to the shaft portion 5a of each bolt 5 via the washer 7, and the nut 6 is tightened to the bolt 5. As a result, the overlapping portions of the bottom steel plate 1 and the splicing plate 2 are respectively joined by bolts 5. In this way, the butt end portions of the adjacent bottom steel plates 1 can be connected to each other via the splicing plate 2.

特開２００４−１７６９０９号公報JP 2004-176909 A 特許平９−２５０５３１号公報Japanese Patent No. 9-250531

ところが、本発明者が先の出願（特願２００７−３０２５９６号）で提案している締結用ボルトの防錆手法によれば、２枚の重ね合わせ鋼板としての底鋼板１と添接板２のうちの一方の鋼板としての底鋼板１のボルト孔３に、ボルト５をボルト仮固定ナット１４を介して仮固定した後、該ボルト５の頭部５ｂを含む上記底鋼板１の一側面部への塗装と、ボルト５の軸部５ａに先端と側面を被覆するよう装着する上記防錆キャップ１５の開口部１５ｂの上記ボルト仮固定ナット１４のキャップ取付部１７への取り付けにより、該ボルト５の軸部５ａを外気より遮断して防錆を図ることができ、この防錆の効果を、上記ボルト５に対するナット６の本締めを行うために該ボルト５の軸部５ａから上記防錆キャップ１５を撤去する時点まで持続させるのに有効であるが、上記のようにしてボルト孔３にボルト仮固定ナット１４を介してボルト５を仮固定し、且つ該ボルト仮固定ナット１４と、ボルト５の頭部５ｂを含む上記底鋼板１の一側面部への塗装と、上記防錆キャップ１５によりボルト５の防錆を図るようにした状態としてある上記底鋼板１が、屋外に暴露されて日射や雨に曝されることで温度変化が生じ、この底鋼板１の温度変化に伴われて該底鋼板１のボルト孔３に取り付けられているボルト５が温度変化すると、該ボルト５の軸部５ａに装着している上記防錆キャップ１５内部の気密性が影響を受ける虞が懸念される。   However, according to the anti-corrosion technique for fastening bolts proposed by the present inventor in a previous application (Japanese Patent Application No. 2007-302596), the bottom steel plate 1 and the splicing plate 2 as two superposed steel plates are used. After the bolt 5 is temporarily fixed to the bolt hole 3 of the bottom steel plate 1 as one of the steel plates via a bolt temporary fixing nut 14, to one side surface portion of the bottom steel plate 1 including the head 5 b of the bolt 5. The bolt 5 is attached to the cap mounting portion 17 of the bolt temporary fixing nut 14 of the opening portion 15b of the rust prevention cap 15 which is mounted so as to cover the tip portion and the side surface of the shaft portion 5a of the bolt 5. The shaft portion 5a can be shielded from the outside air to prevent rust, and the effect of this rust prevention can be obtained from the shaft portion 5a of the bolt 5 in order to perform final tightening of the nut 6 with respect to the bolt 5. Until the point of removal The bolt 5 is temporarily fixed to the bolt hole 3 via the bolt temporary fixing nut 14 as described above, and the bottom including the bolt temporary fixing nut 14 and the head 5b of the bolt 5 is used. The bottom steel plate 1 in a state in which the bolt 5 is rust-prevented by painting on one side surface of the steel plate 1 and the anti-rust cap 15 is exposed to the outdoors and exposed to sunlight and rain. When the temperature change occurs and the bolt 5 attached to the bolt hole 3 of the bottom steel plate 1 changes in temperature with the temperature change of the bottom steel plate 1, the above-mentioned prevention attached to the shaft portion 5 a of the bolt 5. There is a concern that the airtightness inside the rust cap 15 may be affected.

すなわち、一般に鋼板が夏季に日照を受けると、６０℃〜７０℃にも達することがある。よって、上記ボルト孔３にボルト５が仮固定してある上記底鋼板１が、日照に曝露されて温度上昇し、これに伴い、ボルト孔３に仮固定されているボルト５の温度が上昇すると、該ボルト５の軸部５ａに装着してある可撓性を有する樹脂製としてある防錆キャップ１５も昇温するため、防錆キャップ１５の材質によっては昇温に伴う軟化が生じてしまい、該防錆キャップ１５の開口部１５ｂとボルト仮固定ナット１４のキャップ取付部１７との密着性が弱まることで、防錆キャップ１５の内部の気密性が損なわれる虞が懸念される。   That is, in general, when a steel sheet is exposed to sunlight in summer, it may reach 60 ° C to 70 ° C. Therefore, when the bottom steel plate 1 in which the bolt 5 is temporarily fixed to the bolt hole 3 is exposed to sunlight and the temperature rises, the temperature of the bolt 5 temporarily fixed to the bolt hole 3 increases accordingly. Since the temperature of the rust prevention cap 15 made of a flexible resin attached to the shaft portion 5a of the bolt 5 also rises, depending on the material of the rust prevention cap 15, softening due to the temperature rise occurs. There is a concern that the tightness between the opening 15b of the rust prevention cap 15 and the cap mounting portion 17 of the bolt temporary fixing nut 14 is weakened, so that the airtightness inside the rust prevention cap 15 may be impaired.

又、上記防錆キャップ１５の開口部１５ｂとボルト仮固定ナット１４のキャップ取付部１７との密着性が保持されている状態で、上記と同様にして底鋼板１のボルト孔３に仮固定されているボルト５が温度上昇すると、該ボルト５の軸部５ａに装着してある防錆キャップ１５の内部に封入された空気が温度上昇して体積が膨張し、該防錆キャップ１５の内部圧力が外気圧よりも高くなることに起因して、該防錆キャップ１５がボルト仮固定ナット１４のキャップ取付部１７より抜ける虞が懸念される。   In the same manner as above, the opening 15b of the rust prevention cap 15 and the cap mounting portion 17 of the bolt temporary fixing nut 14 are maintained, and are temporarily fixed to the bolt hole 3 of the bottom steel plate 1 in the same manner as described above. When the temperature of the bolt 5 is increased, the temperature of the air enclosed in the rust prevention cap 15 attached to the shaft portion 5a of the bolt 5 is increased and the volume is expanded, and the internal pressure of the rust prevention cap 15 is increased. There is a concern that the rust prevention cap 15 may come off from the cap mounting portion 17 of the bolt temporary fixing nut 14 due to the fact that becomes higher than the external pressure.

一方、上記ボルト孔３にボルト５を仮固定した状態で屋外に暴露されている上記底鋼板１が、外気温の低下に伴い温度低下し、これに伴い、ボルト孔３に仮固定されているボルトが温度低下すると、該ボルト５の軸部５ａに装着してある防錆キャップ１５の内部に封入された空気が温度低下して体積が収縮して、該防錆キャップ１５の内部が負圧になることがある。この際、上記ボルト仮固定ナット１４のキャップ取付部１７に取り付けてある防錆キャップ１５の開口部１５ｂに雨水等による水分が存在していると、その水分を防錆キャップ１５の内部に吸い上げる現象が生じる虞も懸念される。   On the other hand, the bottom steel plate 1 exposed to the outside in a state where the bolt 5 is temporarily fixed to the bolt hole 3 decreases in temperature as the outside air temperature decreases, and is temporarily fixed to the bolt hole 3 accordingly. When the temperature of the bolt decreases, the air enclosed in the anticorrosion cap 15 attached to the shaft portion 5a of the bolt 5 decreases in temperature and contracts in volume, and the internal pressure of the anticorrosion cap 15 is negative. May be. At this time, if moisture due to rain water or the like is present in the opening portion 15 b of the rust prevention cap 15 attached to the cap attachment portion 17 of the bolt temporary fixing nut 14, the moisture is sucked into the rust prevention cap 15. There is also a concern that this may occur.

そこで、本発明は、ボルトを用いて接合するようにする２枚の重ね合わせ鋼板のうちの一方の鋼板のボルト孔にボルト仮固定ナットを介して仮固定するボルトの軸部に装着する防錆キャップの内部の気密性が、上記一方の鋼板の温度変化に伴うボルトの温度変化が生じても影響を受ける虞を解消できる防錆キャップ一体式ボルト仮固定ナットを提供しようとするものである。   Therefore, the present invention provides a rust preventive device that is attached to a shaft portion of a bolt that is temporarily fixed to a bolt hole of one of the two stacked steel plates to be joined using a bolt via a bolt temporary fixing nut. It is an object of the present invention to provide a rust preventive cap integrated bolt temporary fixing nut that can eliminate the possibility that the airtightness inside the cap is affected even if the temperature change of the bolt accompanying the temperature change of the one steel plate.

本発明は、上記課題を解決するために、請求項１に対応して、ボルトを用いて接合する２枚の重ね合わせ鋼板のうちの一方の鋼板のボルト孔よりも軸心方向の一端側が小径となるようにしてあるボルト仮固定ナット本体の軸心方向の他端側に、ボルトの軸部を覆うことができるようにしてある防錆キャップ部の開口側端部を気密状態に一体に取り付け、更に、上記ボルト仮固定ナット本体と防錆キャップ部との境界部分に、該防錆キャップ部を上記ボルト仮固定ナット本体より切り離すことができるようにする切断機構を設けてなる構成を有する構成とする。   In order to solve the above-mentioned problem, the present invention corresponds to claim 1 and has one end side in the axial direction smaller in diameter than the bolt hole of one steel plate of two superposed steel plates joined using bolts. At the other end in the axial direction of the bolt temporary fixing nut body that is supposed to be, the opening side end of the rust prevention cap part that can cover the shaft part of the bolt is integrally attached in an airtight state Furthermore, a configuration having a configuration in which a cutting mechanism is provided at a boundary portion between the bolt temporary fixing nut main body and the antirust cap portion so that the antirust cap portion can be separated from the bolt temporary fixing nut main body. And

又、上記構成において、切断機構を、ボルト仮固定ナット本体と防錆キャップ部との境界部分の外周面に周方向に設けてなる切断用溝とした構成とする。   In the above configuration, the cutting mechanism is configured as a cutting groove provided in the circumferential direction on the outer peripheral surface of the boundary portion between the bolt temporary fixing nut body and the rust prevention cap portion.

更に、上記各構成において、防錆キャップ部の非開口側端部の軸心位置に、レンチ嵌着部を、軸心方向の外方へ所要寸法突出させて設けるようにした構成とする。   Furthermore, in each said structure, it is set as the structure which provided the wrench fitting part in the axial center position of the non-opening side edge part of a rust prevention cap part so that a required dimension may protrude outward in an axial direction.

本発明の防錆キャップ一体式ボルト仮固定ナットによれば、以下のような優れた効果を発揮する。
（１）ボルトを用いて接合する２枚の重ね合わせ鋼板のうちの一方の鋼板のボルト孔よりも軸心方向の一端側が小径となるようにしてあるボルト仮固定ナット本体の軸心方向の他端側に、ボルトの軸部を覆うことができるようにしてある防錆キャップ部の開口側端部を気密状態に一体に取り付け、更に、上記ボルト仮固定ナット本体と防錆キャップ部との境界部分に、該防錆キャップ部を上記ボルト仮固定ナット本体より切り離すことができるようにする切断機構を設けてなる構成としてあるので、ボルト仮固定ナット本体を、２枚の重ね合わせ鋼板のうちの一方の鋼板のボルト孔に一側面側より挿通させたボルトの軸部に螺着させて、該ボルト仮固定ナット本体の軸心方向の一端側が上記一方の鋼板のボルト孔と上記ボルトとの隙間に食い込むように締め付けることで、上記ボルトを上記一方の鋼板のボルト孔に仮固定できると共に、該ボルトの軸部を防錆キャップ部により覆った状態で、上記ボルト仮固定ナット本体と上記一方の鋼板のボルト孔との間を密閉できる。よって、この状態で、上記ボルトの頭部を含む上記一方の鋼板の一側面部の塗装を行うことで、該ボルトを外気より遮断して防錆を図ることが可能になる。更に、このボルトの防錆効果を、上記ボルトに対するナットの本締めを行うために、上記防錆キャップ部をボルト仮固定ナット本体との境界部分で切り離して撤去するまで持続させることができる。
（２）更に、上記防錆キャップ部はボルト仮固定ナット本体と一体にしてあるため、上記ボルト孔にボルトを仮固定した状態の一方の鋼板が屋外に暴露されることで温度変化して、ボルト孔に仮固定されているボルトの温度変化を介して上記防錆キャップ部が温度変化しても、該防錆キャップ部と上記ボルト仮固定ナット本体との間の気密性が影響を受ける虞を解消できる。又、上記ボルトの温度変化に起因して、上記防錆キャップ部の内部に封入されている空気が膨張、収縮することで該防錆キャップ部内部の気圧が、外気圧より高くなったり低くなったりしても、防錆キャップ部の内部の気密性が影響を受ける虞を解消できる。
（３）切断機構を、ボルト仮固定ナット本体と防錆キャップ部との境界部分の外周面に周方向に設けてなる切断用溝とした構成とすることにより、上記切断用溝を設けた部分の強度を、ボルト仮固定ナット本体及び防錆キャップ部の強度よりも低下させることができるため、外力を加えることで該切断用溝の部分を破断させることが可能となる。よって、上記防錆キャップ部をボルト仮固定ナット本体より必要に応じて切り離すための切断機構を容易に且つシンプルな構成で実現することができる。
（４）防錆キャップ部の非開口側端部の軸心位置に、レンチ嵌着部を、軸心方向の外方へ所要寸法突出させて設けるようにした構成とすることにより、レンチ嵌着部に嵌着させる締付け工具を用いて、２枚の重ね合わせ鋼板のうちの一方の鋼板のボルト孔に挿通させたボルトの軸部に対するボルト仮固定ナット本体の締付けを行って該ボルトを仮固定する作業を容易に実施することができる。又、ボルト仮固定ナット本体と防錆キャップ部との境界部分に設ける切断機構として切断用溝が設けてある場合は、上記レンチ嵌着部に嵌着させる締付け工具により、該レンチ嵌着部を介して防錆キャップ部に対して上記ボルトの仮固定作業時よりも大きなトルクを作用させて上記切断用溝を破断させることが可能になる。このため、上記ボルトを仮固定しているボルト仮固定ナット本体より防錆キャップ部を切り離して撤去する作業を容易なものとすることが可能になる。 According to the rust preventive cap integrated bolt temporary fixing nut of the present invention, the following excellent effects are exhibited.
(1) Other than the axial direction of the bolt temporary fixing nut body in which one end side in the axial direction is smaller in diameter than the bolt hole of one of the two stacked steel plates to be joined using bolts. At the end side, the opening side end of the rust prevention cap part that can cover the shaft part of the bolt is integrally attached in an airtight state, and further, the boundary between the bolt temporary fixing nut body and the rust prevention cap part. Since the portion is configured to have a cutting mechanism that allows the rust prevention cap portion to be separated from the bolt temporary fixing nut main body, the bolt temporary fixing nut main body is made of two stacked steel plates. Screwed into the bolt shaft inserted into the bolt hole of one steel plate from one side, and one end side in the axial center direction of the bolt temporary fixing nut body is a gap between the bolt hole of the one steel plate and the bolt Eat The bolts can be temporarily fixed to the bolt holes of the one steel plate, and the bolt temporary fixing nut main body and the bolts of the one steel plate are covered with the antirust cap portion. The space between the holes can be sealed. Therefore, in this state, by coating one side surface of the one steel plate including the head of the bolt, the bolt can be blocked from outside air to prevent rust. Further, the rust prevention effect of the bolt can be maintained until the rust prevention cap portion is separated and removed at the boundary portion with the bolt temporary fixing nut body in order to perform final tightening of the nut with respect to the bolt.
(2) Furthermore, since the rust prevention cap part is integrated with the bolt temporary fixing nut body, the temperature changes by exposing one steel plate in a state where the bolt is temporarily fixed to the bolt hole to the outside, Even if the temperature of the rust prevention cap changes due to the temperature change of the bolt temporarily fixed in the bolt hole, the airtightness between the rust prevention cap and the bolt temporary fixing nut body may be affected. Can be eliminated. Also, due to the temperature change of the bolt, the air enclosed in the rust prevention cap portion expands and contracts, so that the pressure inside the rust prevention cap portion becomes higher or lower than the external pressure. The possibility of being affected by the airtightness inside the rust prevention cap portion can be eliminated.
(3) A portion provided with the cutting groove by configuring the cutting mechanism as a cutting groove provided in the circumferential direction on the outer peripheral surface of the boundary portion between the bolt temporary fixing nut body and the rust prevention cap portion. Therefore, the cutting groove portion can be broken by applying an external force. Therefore, a cutting mechanism for separating the rust prevention cap portion from the bolt temporary fixing nut body as necessary can be easily realized with a simple configuration.
(4) A wrench fitment is made by providing a wrench fitment part projecting the required dimension outward in the axial direction at the axial center position of the non-opening side end of the rust prevention cap part. Temporarily fix the bolt by tightening the bolt temporary fixing nut body against the shaft of the bolt inserted into the bolt hole of one of the two stacked steel plates using a tightening tool to be fitted to the part. Can be easily performed. Further, when a cutting groove is provided as a cutting mechanism provided at the boundary between the bolt temporary fixing nut body and the rust prevention cap portion, the wrench fitting portion is attached by a tightening tool to be fitted to the wrench fitting portion. Accordingly, it is possible to cause the cutting groove to break by applying a larger torque to the rust prevention cap portion than during the temporary fixing operation of the bolt. For this reason, it becomes possible to facilitate the work of separating and removing the rust prevention cap portion from the temporary bolt fixing nut body temporarily fixing the bolt.

以下、本発明を実施するための最良の形態を図面を参照して説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

図１（イ）（ロ）乃至図４（イ）（ロ）は本発明の防錆キャップ一体式ボルト仮固定ナットの実施の一形態として、２枚の重ね合わせ鋼板として、図５に示したと同様の合成床版の底鋼板１と添接板２との接合に用いるボルト５の防錆に適用する場合を示すもので、以下のような構成としてある。   FIG. 1 (a) (b) to FIG. 4 (b) (b) are shown in FIG. 5 as two laminated steel plates as one embodiment of the rust prevention cap integrated bolt temporary fixing nut of the present invention. The case where it applies to the rust prevention of the volt | bolt 5 used for the joining of the bottom steel plate 1 and the attachment board 2 of the same synthetic floor slab is shown, and it has the following structures.

すなわち、本発明の防錆キャップ一体式ボルト仮固定ナット２０は、図１（イ）（ロ）及び図２に示す如く、図８（イ）（ロ）（ハ）に示したボルト仮固定ナット１４のテーパ部１６と同様に、外径寸法が底鋼板１に設けてあるボルト孔３よりも細径となる軸心方向の一端部から上記底鋼板１のボルト孔３よりも所要寸法太径となる軸心方向の他端部へ向けて外周面が徐々に拡径するテーパ部２２を備え、該テーパ部２２の軸心方向他端側に、軸心方向に所要寸法延びる円筒部２３を一体に設けると共に、内周面に上記底鋼板１と添接板２の接合に用いるボルト５の軸部５ａに螺着させるための雌ねじ部２４を設けてなるボルト仮固定ナット本体２１を有し、且つ該ボルト仮固定ナット本体２１の軸心方向他端側となる上記円筒部２３の軸心方向他端側に、ボルト仮固定ナット本体２１の軸心方向に沿って延びる筒状として、ボルト仮固定ナット本体２１寄りの端部となる軸心方向一端側を開口させる一方、ボルト仮固定ナット本体２１より離反する側の端部となる軸心方向他端部を閉塞させて、上記ボルト５の軸部５ａの先端と周りを覆うことができるようにした防錆キャップ部２５の上記一端側開口を、上記ボルト仮固定ナット本体２１の軸心方向他端部となる上記円筒部２３の軸心方向他端部に気密に取り付けてなる構成とする。更に、上記ボルト仮固定ナット本体２１の円筒部２３と、上記防錆キャップ部２５との境界となる部分には、切断機構として、たとえば、周壁の外周面に切断用溝２６を全周に亘り設けてなる構成とする。   That is, the anti-corrosion cap integrated bolt temporary fixing nut 20 of the present invention is the bolt temporary fixing nut shown in FIGS. 8 (A), (B) and FIG. 14, the outer diameter is smaller than the bolt hole 3 provided in the bottom steel plate 1, and the required dimension is larger than the bolt hole 3 of the bottom steel plate 1 from one end in the axial center direction. A taper portion 22 whose outer peripheral surface gradually increases in diameter toward the other end portion in the axial direction, and a cylindrical portion 23 extending in the axial direction on the other end side in the axial center direction of the taper portion 22. A bolt temporary fixing nut main body 21 is provided which is provided integrally and provided with an internal thread portion 24 to be screwed to the shaft portion 5a of the bolt 5 used for joining the bottom steel plate 1 and the attachment plate 2 on the inner peripheral surface. And the axial center of the cylindrical portion 23 on the other axial end side of the bolt temporary fixing nut main body 21 On the other end side, a cylindrical shape extending along the axial center direction of the bolt temporary fixing nut main body 21 is opened at one end side in the axial direction, which is an end portion near the bolt temporary fixing nut main body 21, while the bolt temporary fixing nut is opened. The one end side of the anticorrosion cap part 25 which closed the axial direction other end part used as the edge part on the side away from the main body 21, and was able to cover the front-end | tip and circumference | surroundings of the axial part 5a of the said volt | bolt 5. The opening is configured to be airtightly attached to the other axial end portion of the cylindrical portion 23 that is the other axial end portion of the bolt temporary fixing nut body 21. Further, as a cutting mechanism, for example, a cutting groove 26 is provided on the outer peripheral surface of the peripheral wall at the boundary between the cylindrical portion 23 of the bolt temporary fixing nut body 21 and the rust prevention cap portion 25 over the entire circumference. A configuration is provided.

詳述すると、上記本発明の防錆キャップ一体式ボルト仮固定ナット２０は、所要の弾性変形を許容できるように、たとえば、合成樹脂製、あるいは、黄銅、銅、アルミニウム等、上記底鋼板１及びボルト５に比して柔らかい金属製としてある。これにより、上記防錆キャップ一体式ボルト仮固定ナット２０のボルト仮固定ナット本体２１を、後述するようにボルト５に対する締付け軸力によって上記底鋼板１のボルト孔３とボルト５との隙間にねじ込むことで、該ボルト仮固定ナット本体２１を、上記底鋼板１のボルト孔３とボルト５との隙間に、上記テーパ部２２の軸心方向一端部側から、該テーパ部２２の外径が上記底鋼板１のボルト孔３と等しくなる位置よりも太径側である軸心方向他端側へ所要寸法寄った部分まで楔状に食い込ませることができるようにしてある。したがって、上記ボルト仮固定ナット本体２１のテーパ部２２における底鋼板１のボルト孔３とボルト５との隙間に食い込まされた部分に生じる径方向の圧縮弾性変形の復元力により、該テーパ部２２の外周面を、上記底鋼板１のボルト孔３の上端部付近の内周面に周方向の全長亘り強く密着させることで、ボルト仮固定ナット本体２１と、底鋼板１のボルト孔３の内周面との間を密閉できるようにしてある。なお、材質を合成樹脂とする場合は、上記ボルト仮固定ナット本体２１のテーパ部２２の外周面と、上記底鋼板１のボルト孔３の上端部付近の内周面との間に、金属同士の接触面にて傷等に起因して微小な隙間が形成される虞をより確実に防止できる効果が期待される。   More specifically, the rust preventive cap integrated bolt temporary fixing nut 20 of the present invention is made of, for example, synthetic resin, brass, copper, aluminum, etc. The metal is softer than the bolt 5. As a result, the bolt temporary fixing nut body 21 of the rust prevention cap integrated bolt temporary fixing nut 20 is screwed into the gap between the bolt hole 3 and the bolt 5 of the bottom steel plate 1 by a tightening axial force against the bolt 5 as will be described later. Thus, the outer diameter of the tapered portion 22 is set to the gap between the bolt hole 3 and the bolt 5 of the bottom steel plate 1 from the one end side in the axial direction of the tapered portion 22. The portion closer to the required dimension can be bitten like a wedge toward the other end side in the axial direction, which is the larger diameter side than the position equal to the bolt hole 3 of the bottom steel plate 1. Therefore, due to the restoring force of the compressive elastic deformation in the radial direction that occurs in the portion of the tapered portion 22 of the bolt temporary fixing nut body 21 that is bitten in the gap between the bolt hole 3 and the bolt 5 of the bottom steel plate 1, The inner peripheral surface of the bolt temporary fixing nut main body 21 and the inner periphery of the bolt hole 3 of the bottom steel plate 1 is formed by closely attaching the outer peripheral surface to the inner peripheral surface near the upper end of the bolt hole 3 of the bottom steel plate 1 over the entire length in the circumferential direction. The space between the surfaces can be sealed. In the case where the material is synthetic resin, metal is interposed between the outer peripheral surface of the tapered portion 22 of the bolt temporary fixing nut body 21 and the inner peripheral surface near the upper end of the bolt hole 3 of the bottom steel plate 1. The effect that the possibility of forming a minute gap due to scratches or the like on the contact surface can be more reliably prevented is expected.

上記ボルト仮固定ナット本体２１のテーパ部２２の外周面における該テーパ部２２の外径が上記底鋼板１のボルト孔３の径よりもやや太径となる部分の軸心方向他端側には、軸心方向に対する傾斜角度が上記テーパ部２２の軸心方向に対する傾斜角度より大きくなるようにテーパ形状を変化させた係止用テーパ面２７が設けてある。   On the other end side in the axial direction of the portion where the outer diameter of the tapered portion 22 on the outer peripheral surface of the tapered portion 22 of the bolt temporary fixing nut body 21 is slightly larger than the diameter of the bolt hole 3 of the bottom steel plate 1. A locking taper surface 27 having a taper shape changed so that the inclination angle with respect to the axial direction is larger than the inclination angle with respect to the axial direction of the tapered portion 22 is provided.

又、上記ボルト仮固定ナット本体２１は、上記ボルト５として、たとえば、図１（ロ）に示すような頭部５ｂ近傍の首下部にねじが刻設されていない領域又は不完全ねじ部が存在しているボルト５を用いる場合は、該ボルト仮固定ナット本体２１の内周面における軸心方向一端部側に、雌ねじ部２４のねじ山のない領域を設けて、該領域に上記ボルト５の首下部のねじが刻設されていない領域又は不完全ねじ部を受けるようにすればよい。   Further, the bolt temporary fixing nut main body 21 has, as the bolt 5, for example, a region where a screw is not engraved or an incomplete screw portion near the head 5 b as shown in FIG. When the bolt 5 is used, a region without the thread of the female screw portion 24 is provided on one end side in the axial center direction on the inner peripheral surface of the temporary bolt fixing nut body 21, and the bolt 5 is provided in the region. What is necessary is just to receive the area | region where the screw | thread of the lower neck part is not engraved, or an incomplete screw part.

上記ボルト仮固定ナット本体２１の軸心方向寸法は、少なくとも、内周面の雌ねじ部１８の軸心方向に、後述するように上記ボルト５の仮固定を行うための十分な締付け軸力を確保するために必要とされる数のねじ山を配列できるように設定してある。且つ後述するように、底鋼板１のボルト孔３に下面側から挿通させたボルト５の軸部５ａに対して、上記ボルト仮固定ナット本体２１を、該ボルト仮固定ナット本体２１のテーパ部２２が上記底鋼板１のボルト孔３とボルト５との隙間に食い込まされた状態となるまで締付けを行う状態のときに、上記ボルト仮固定ナット本体２１の軸心方向他端部となる上記円筒部２３の軸心方向他端部と上記防錆キャップ部２５との境界に設けてある上記切断用溝２６が上記底鋼板１の上面より突出する寸法が、上記底鋼板１の端部に重ねて配置する添接板２の板厚以下の寸法となるように設定してあるものとする。なお、後述する図４（ロ）に示すように、上記底鋼板１と添接板２の接合の際に上記ボルト５に嵌めるワッシャ７として、ボルト仮固定ナット本体２１の軸心方向他端側の円筒部２３の外径よりも大きな寸法の内径を有するワッシャ７を使用する場合は、上記したように底鋼板１のボルト孔３に挿通させたボルト５の軸部５ａに上記ボルト仮固定ナット本体２１の締付けを行った状態のときにおける上記切断用溝２６が上記底鋼板１の上面より突出する寸法が、上記添接板２の板厚とワッシャ７の厚み寸法の和以下の寸法となるように設定すればよい。   The axial dimension of the bolt temporary fixing nut main body 21 ensures a sufficient tightening axial force for temporarily fixing the bolt 5 as will be described later, at least in the axial direction of the internal thread portion 18 on the inner peripheral surface. It is set so that the necessary number of threads can be arranged. And as will be described later, the bolt temporary fixing nut main body 21 is connected to the bolt portion 3 of the bolt 5 inserted into the bolt hole 3 of the bottom steel plate 1 from the lower surface side, and the taper portion 22 of the bolt temporary fixing nut main body 21 is inserted. The cylindrical portion that becomes the other axial end of the bolt temporary fixing nut body 21 when the bolt is tightened until it is in a state of being bitten into the gap between the bolt hole 3 and the bolt 5 of the bottom steel plate 1 The dimension in which the cutting groove 26 provided at the boundary between the other axial end portion 23 and the rust prevention cap portion 25 protrudes from the upper surface of the bottom steel plate 1 overlaps the end portion of the bottom steel plate 1. Assume that the dimensions are set to be equal to or smaller than the thickness of the attachment plate 2 to be arranged. In addition, as shown in FIG. 4 (B), which will be described later, as a washer 7 fitted to the bolt 5 when the bottom steel plate 1 and the attachment plate 2 are joined, the other end side in the axial center direction of the bolt temporary fixing nut body 21 When the washer 7 having an inner diameter larger than the outer diameter of the cylindrical portion 23 is used, the bolt temporary fixing nut is attached to the shaft portion 5a of the bolt 5 inserted through the bolt hole 3 of the bottom steel plate 1 as described above. The dimension in which the cutting groove 26 protrudes from the upper surface of the bottom steel plate 1 when the main body 21 is tightened is equal to or less than the sum of the thickness of the attachment plate 2 and the thickness of the washer 7. It should be set as follows.

上記防錆キャップ部２５の軸心方向他端部の軸心位置には、所要の二面幅を有する六角形のレンチ嵌着部２８が、軸心方向他端側へ所要寸法突出させて設けてある。これにより、底鋼板１のボルト孔３に下面側より挿通させて配置したボルト５の軸部５ａに、本発明の防錆キャップ一体式ボルト仮固定ナット２０のボルト仮固定ナット本体２１の雌ねじ部２４を螺着させた後、上記レンチ嵌着部２８に、図示しないナットランナー（電動トルクレンチ）の如き締付け工具のソケットを嵌め、該締付け工具により、上記レンチ嵌着部２８を介して防錆キャップ部２５と一体にボルト仮固定ナット本体２１を締め込み方向へ回転させることで、該ボルト仮固定ナット本体２１を、所要のトルクで上記ボルト５の軸部５ａに締め付けることができるようにしてある。したがって、上記ボルト仮固定ナット本体２１の締め付け軸力により、上記ボルト仮固定ナット本体２１のテーパ部２２を、本発明者が先の出願（特願２００７−３０２５９６号）で提案している図８（イ）（ロ）（ハ）に示した如きボルト仮固定ナット１４のテーパ部１６と同様に、底鋼板１のボルト孔３の上端部の内周面と、該ボルト孔３に挿通させてあるボルト５の軸部５ａの外周面との間の隙間に食い込ませて、上記ボルト孔３にボルト５を仮固定して、該ボルト５に後でナット６の本締めを行う際にもボルト５に共回りが生じる虞がないようにすると共に、上記底鋼板１のボルト孔３の上端部の内周面に、上記ボルト仮固定ナット本体２１のテーパ部２２の外周面を、周方向の全周に亘り強く密着させて、該ボルト仮固定ナット本体２１と上記ボルト孔３の上端部内周面との間を密閉させる作業を、上記締付け工具によって行うことができるようにしてある。   A hexagonal wrench fitting portion 28 having a required two-surface width is provided at the axial center position of the other axial end portion of the anticorrosion cap portion 25 so as to project the required dimension toward the other axial end side. It is. As a result, the internal thread portion of the bolt temporary fixing nut body 21 of the rust preventive cap integrated bolt temporary fixing nut 20 of the present invention is inserted into the shaft portion 5a of the bolt 5 that is inserted through the bolt hole 3 of the bottom steel plate 1 from the lower surface side. After the screw 24 is screwed, a socket of a tightening tool such as a nut runner (electric torque wrench) (not shown) is fitted to the wrench fitting portion 28, and the wrench fitting portion 28 is used to prevent rust. By rotating the bolt temporary fixing nut main body 21 integrally with the cap portion 25 in the tightening direction, the bolt temporary fixing nut main body 21 can be tightened to the shaft portion 5a of the bolt 5 with a required torque. is there. Accordingly, the inventor has proposed the tapered portion 22 of the bolt temporary fixing nut body 21 in the previous application (Japanese Patent Application No. 2007-302596) due to the tightening axial force of the bolt temporary fixing nut body 21. FIG. (B) Like the tapered portion 16 of the bolt temporary fixing nut 14 as shown in (b) (c), the inner peripheral surface of the upper end portion of the bolt hole 3 of the bottom steel plate 1 and the bolt hole 3 are inserted. Even when the bolt 5 is temporarily fixed in the bolt hole 3 by being bitten into the gap between the outer peripheral surface of the shaft portion 5a of a certain bolt 5 and the nut 6 is finally tightened to the bolt 5 later, the bolt 5 and the outer peripheral surface of the tapered portion 22 of the bolt temporary fixing nut main body 21 on the inner peripheral surface of the upper end portion of the bolt hole 3 of the bottom steel plate 1 in the circumferential direction. Tightly adhere to the entire circumference, and the bolt temporary fixing nut The work to seal between the 21 and the upper inner peripheral surface of the bolt hole 3, are to be able to carry out by the tightening tool.

更に、上記ボルト仮固定ナット本体２１のテーパ部２２には、外周面における外径が上記底鋼板１のボルト孔３の径よりもやや太径となる部分の軸心方向他端側に、軸心方向に対する傾斜角度が大となる係止用テーパ面２７が設けてあるため、上記ボルト仮固定ナット本体２１のボルトへの締付け作業の際、該係止用テーパ面２７が上記底鋼板１のボルト孔３の上端部に達するようになると、該ボルト孔３とボルト５との隙間に食い込む力が大きくなる。このため、上記底鋼板１のボルト孔３の上端部内周面に対するボルト仮固定ナット本体２１の密着性が高まることで、底鋼板１のボルト孔３の上端部内周面とボルト仮固定ナット本体２１との間の密閉性をより高めることができるようにしてあると共に、ボルト仮固定ナット本体２１に対する締付け軸力によって仮固定するボルト５の回転防止作用をより強化することができるようにしてある。   Further, the tapered portion 22 of the bolt temporary fixing nut main body 21 has a shaft on the other end side in the axial center of the portion where the outer diameter on the outer peripheral surface is slightly larger than the diameter of the bolt hole 3 of the bottom steel plate 1. Since the locking taper surface 27 having a large inclination angle with respect to the center direction is provided, the locking taper surface 27 is formed on the bottom steel plate 1 when the bolt temporary fixing nut body 21 is tightened to the bolt. When reaching the upper end of the bolt hole 3, the force that bites into the gap between the bolt hole 3 and the bolt 5 increases. For this reason, the adhesiveness of the bolt temporary fixing nut main body 21 with respect to the internal peripheral surface of the upper end part of the bolt hole 3 of the said bottom steel plate 1 increases, Therefore The internal peripheral surface of the upper end part of the bolt hole 3 of the bottom steel plate 1 and the bolt temporary fixing nut main body 21 are improved. In addition, it is possible to further enhance the anti-rotation action of the bolt 5 that is temporarily fixed by the tightening axial force with respect to the bolt temporary fixing nut main body 21.

上記ボルト仮固定ナット本体２１と防錆キャップ部２５との境界部に設ける上記切断用溝２６は、該切断用溝２６の内側に位置する部分の周壁の厚み寸法を、上記ボルト仮固定ナット本体２１の円筒部２３、及び、防錆キャップ部２５のいずれの周壁の肉厚よりも薄くすることで、上記切断用溝２６の部分の強度が、上記ボルト仮固定ナット本体２１及び防錆キャップ部２５の強度よりも低くなるようにしてある。これにより、上記ボルト仮固定ナット本体２１を底鋼板１のボルト孔３に下面側より挿通させたボルト５に対し締め付けた状態としてある本発明の防錆キャップ一体式ボルト仮固定ナット２０にて、上記防錆キャップ部２５側に強い外力を作用させることで、上記切断用溝２６の部分を切断（破断）させることができるようにしてある。具体的には、たとえば、上記ボルト仮固定ナット本体２１を底鋼板１のボルト孔３に挿通させたボルト５に対しボルト仮固定ナット本体２１を締め付けた状態としてある本発明の防錆キャップ一体式ボルト仮固定ナット２０にて、上記防錆キャップ部２５の軸心方向他端部に設けてあるレンチ嵌着部２８に、図示しないナットランナー（電動トルクレンチ）の如き締付け工具のソケットを嵌合させて、該締付け工具より、上記レンチ嵌着部２８に対してボルト仮固定ナット本体２１の締め込み方向と同方向へ、上記ボルト５の仮固定を行うべく該ボルト５に対して上記ボルト仮固定ナット本体２１を締め付けたときの倍程度のトルクを作用させることで、上記切断用溝２６の部分を破断させることができるようにしてある。これにより、上記防錆キャップ部２５を、上記ボルト５に締め込んであるボルト仮固定ナット本体２１より切り離して撤去することで、該ボルト５の軸部５ａを露出させることができるようにしてある。   The cutting groove 26 provided at the boundary between the bolt temporary fixing nut main body 21 and the rust prevention cap portion 25 has a thickness dimension of a peripheral wall of a portion located inside the cutting groove 26, and the bolt temporary fixing nut main body. By making the thickness of any one of the peripheral wall of the cylindrical portion 23 and the rust prevention cap portion 25 thinner, the strength of the portion of the cutting groove 26 is such that the bolt temporary fixing nut main body 21 and the rust prevention cap portion. The strength is lower than 25. Thereby, in the bolt anti-rust cap integrated bolt temporary fixing nut 20 of the present invention in a state where the bolt temporary fixing nut main body 21 is tightened to the bolt 5 inserted through the bolt hole 3 of the bottom steel plate 1 from the lower surface side, By applying a strong external force to the rust prevention cap portion 25 side, the portion of the cutting groove 26 can be cut (broken). Specifically, for example, the rust preventive cap integrated type of the present invention in which the bolt temporary fixing nut main body 21 is tightened with respect to the bolt 5 in which the bolt temporary fixing nut main body 21 is inserted into the bolt hole 3 of the bottom steel plate 1. With a bolt temporary fixing nut 20, a socket of a tightening tool such as a nut runner (electric torque wrench) (not shown) is fitted to a wrench fitting portion 28 provided at the other axial end of the rust prevention cap portion 25. Then, from the tightening tool, the bolt 5 is temporarily fixed to the bolt 5 in order to temporarily fix the bolt 5 to the wrench fitting portion 28 in the same direction as the tightening direction of the bolt temporary fixing nut body 21. By applying a torque about twice that when the fixing nut body 21 is tightened, the portion of the cutting groove 26 can be broken. Thereby, the shaft portion 5a of the bolt 5 can be exposed by separating and removing the rust prevention cap portion 25 from the bolt temporary fixing nut body 21 tightened on the bolt 5. .

上記防錆キャップ部２５は、その内径が、ボルトの軸部５ａの外径よりもやや大きくなるように設定してある。   The rust prevention cap portion 25 is set so that its inner diameter is slightly larger than the outer diameter of the bolt shaft portion 5a.

又、上記防錆キャップ部２５の外径と、ボルト仮固定ナット本体２１の円筒部２３の外径は、該ボルト仮固定ナット本体２１のテーパ部２２における太径側となる軸心方向他端部の外径と同様の寸法となるようにしてある。これにより、図３（ロ）で後述するように、底鋼板１の上側に載置して接合するための添接板２のボルト孔４の内径の寸法を、上記ボルト仮固定ナット本体２１のテーパ部２２の太径側となる軸心方向他端部の外径よりもやや大きい寸法に設定することで、底鋼板１のボルト孔３に下面側より挿通させたボルト５に、上記ボルト仮固定ナット本体２１を締めることで上記防錆キャップ一体式ボルト仮固定ナット２０を装着したままの状態、すなわち、上記ボルト５の軸部５ａの先端側と周りを上記防錆キャップ一体式ボルト仮固定ナット２０の防錆キャップ部２５で覆ったままの状態で、上記添接板２のボルト孔４に挿通させることができるようにしてある。   The outer diameter of the rust prevention cap portion 25 and the outer diameter of the cylindrical portion 23 of the bolt temporary fixing nut main body 21 are the other end in the axial direction which is the larger diameter side of the tapered portion 22 of the bolt temporary fixing nut main body 21. The dimensions are the same as the outer diameter of the part. Accordingly, as will be described later with reference to FIG. 3B, the inner diameter of the bolt hole 4 of the attachment plate 2 to be placed on and joined to the upper side of the bottom steel plate 1 is set to By setting the dimension slightly larger than the outer diameter of the other end in the axial direction on the large diameter side of the taper portion 22, the bolt 5 is inserted into the bolt hole 3 of the bottom steel plate 1 from the lower surface side. By tightening the fixing nut body 21, the rust prevention cap integrated bolt temporary fixing nut 20 is still attached, that is, the bolt 5 is fixed around the front end of the shaft portion 5a and around the bolt. The nut 20 can be inserted into the bolt hole 4 of the attachment plate 2 while being covered with the antirust cap portion 25 of the nut 20.

以上の構成としてある防錆キャップ一体式ボルト仮固定ナット２０を使用して、図５に示したと同様に２枚の重ね合わせ鋼板としての合成床版の底鋼板１と添接板２の接合に用いるボルト５を、上記底鋼板１のボルト孔３に仮止めした状態で防錆する場合は、先ず、工場等にて、図３（イ）に示す如く、上記底鋼板１のボルト孔３に、下面側よりボルト（高力ボルト）５、たとえば、トルシア型のボルト５を挿通させて配置した後、該ボルト５の軸部５ａに、上記防錆キャップ一体式ボルト仮固定ナット２０のボルト仮固定ナット本体２１を、上方より嵌めて雌ねじ部２４を螺着させる。その後、上記防錆キャップ部２５の軸心方向他端部に設けてあるレンチ嵌着部２８に、図示しない締付け工具のソケットを嵌合させて、該締付け工具により、上記レンチ嵌着部２８を介して上記防錆キャップ部２５と一体に上記ボルト仮固定ナット本体２１を回転させて、該ボルト仮固定ナット本体２１を上記ボルト５に対して締め込むことにより、ボルト固定用ナット本体２１の上記ボルト５に対する締付け軸力を利用して、該ボルト仮固定ナット本体２１のテーパ部２２を、細径側となる一端部より、上記底鋼板１のボルト孔３の上端部とボルト５との隙間にねじ込んで楔状に食い込ませるようにする。なお、上記ボルト５が通常の六角ボルト（高力ボルト）である場合には、上記底鋼板１の下側からボルト５の頭部５ｂを締め込み方向へ回転させるようにしてもよい。   Using the rust preventive cap integrated bolt temporary fixing nut 20 having the above-described configuration, as shown in FIG. 5, the bottom plate 1 of the composite floor slab and the attachment plate 2 as two superposed steel plates are joined. When rust prevention is performed in a state where the bolt 5 to be used is temporarily fixed to the bolt hole 3 of the bottom steel plate 1, first, as shown in FIG. After the bolt (high-strength bolt) 5, for example, the Torcia-type bolt 5 is inserted from the lower surface side, the bolt 5 is temporarily attached to the shaft portion 5 a of the bolt 5. The fixing nut main body 21 is fitted from above and the female screw portion 24 is screwed. Thereafter, a socket of a tightening tool (not shown) is fitted to the wrench fitting portion 28 provided at the other axial end of the rust prevention cap portion 25, and the wrench fitting portion 28 is moved by the tightening tool. The bolt temporary fixing nut main body 21 is rotated integrally with the rust prevention cap portion 25 and the bolt temporary fixing nut main body 21 is tightened with respect to the bolt 5, whereby the bolt fixing nut main body 21 is Using the tightening axial force with respect to the bolt 5, the gap between the upper end portion of the bolt hole 3 of the bottom steel plate 1 and the bolt 5 from the one end portion on the small diameter side of the taper portion 22 of the bolt temporary fixing nut body 21. Screwed into the wedge shape. In addition, when the said bolt 5 is a normal hexagon bolt (high strength bolt), you may make it rotate the head 5b of the bolt 5 from the lower side of the said bottom steel plate 1 in the tightening direction.

これにより、上記ボルト仮固定ナット本体２１より上記ボルト５に強い締付け軸力を作用させることができることから、該ボルト仮固定ナット本体２１とボルト５との間には、大きな摩擦力が発生するようになる。又、上記ボルト仮固定ナット本体２１は、上記ボルト５に作用させる強い締付け軸力により、テーパ部２２における本来上記底鋼板１のボルト孔３と同径となる位置よりも太径となる部分まで、上記ボルト孔３とボルト５との隙間に強制的に楔状に食い込まされることで、該底鋼板１のボルト孔３とボルト５との隙間において圧縮弾性変形され、その復元力により、該ボルト仮固定ナット本体２１のテーパ部２２の外周面が、上記底鋼板１のボルト孔３の上端部の内周面に、周方向の全周に亘り強く密着するようになり、このため、該ボルト仮固定ナット本体２１と上記底鋼板１のボルト孔３との間にも大きな摩擦力が生じる。よって、上記ボルト５は、上記底鋼板１のボルト孔３に、該ボルト孔３とボルト仮固定ナット本体２１の間の大きな摩擦力、及び、該ボルト仮固定ナット本体２１とボルト５の間の大きな摩擦力によって回転が防止された状態で仮固定されるようになる。   As a result, a strong tightening axial force can be applied to the bolt 5 from the bolt temporary fixing nut main body 21, so that a large frictional force is generated between the bolt temporary fixing nut main body 21 and the bolt 5. become. Further, the bolt temporary fixing nut body 21 has a diameter larger than a position where the diameter of the taper portion 22 is originally the same as the bolt hole 3 of the bottom steel plate 1 due to a strong tightening axial force acting on the bolt 5. By being forced into a wedge shape in the gap between the bolt hole 3 and the bolt 5, it is compressed and elastically deformed in the gap between the bolt hole 3 and the bolt 5 of the bottom steel plate 1, and the restoring force causes the bolt The outer peripheral surface of the taper portion 22 of the temporary fixing nut main body 21 comes into close contact with the inner peripheral surface of the upper end portion of the bolt hole 3 of the bottom steel plate 1 over the entire circumference in the circumferential direction. A large frictional force is also generated between the temporary fixing nut body 21 and the bolt hole 3 of the bottom steel plate 1. Therefore, the bolt 5 has a large frictional force between the bolt hole 3 and the bolt temporary fixing nut main body 21 in the bolt hole 3 of the bottom steel plate 1 and between the bolt temporary fixing nut main body 21 and the bolt 5. It is temporarily fixed in a state where rotation is prevented by a large frictional force.

更に、この際、上記したようにボルト仮固定ナット１４のテーパ部１６の外周面が、上記底鋼板１のボルト孔３の上端部の内周面に、周方向の全周に亘り強く密着することに伴い、該ボルト仮固定ナット１４と、上記底鋼板１のボルト孔３の上端部内周面との間（図中のＤ個所）が密閉される。   Further, at this time, as described above, the outer peripheral surface of the tapered portion 16 of the bolt temporary fixing nut 14 strongly adheres to the inner peripheral surface of the upper end portion of the bolt hole 3 of the bottom steel plate 1 over the entire circumference in the circumferential direction. Accordingly, the space between the temporary bolt fixing nut 14 and the inner peripheral surface of the upper end portion of the bolt hole 3 of the bottom steel plate 1 (D portion in the drawing) is sealed.

しかも、上記ボルト仮固定ナット本体２１のテーパ部２２には、外周面における外径が上記底鋼板１のボルト孔３の径よりもやや太径となる部分の軸心方向他端側に、軸心方向に対する傾斜角度が大となる係止用テーパ面２７が設けてあるため、上記ボルト仮固定ナット本体２１のテーパ部２２が細径側から底鋼板のボルト孔３とボルト５との隙間に食い込まされるときに、該係止用テーパ面２７が、上記底鋼板１のボルト孔３の上端部に達するようになる場合は、該ボルト孔３とボルト５との隙間に食い込む力がより大きくなる。このため、上記底鋼板１のボルト孔３の上端部内周面に対するボルト仮固定ナット本体２１の密着性が高まるため、該ボルト孔３の上端部内周面とボルト仮固定ナット本体２１との間（図中のＤ個所）の密閉性がより高められると共に、ボルト仮固定ナット本体２１に対する締付け軸力によって仮固定するボルト５の回転防止作用がより強化されるようになる。 Moreover, the taper portion 22 of the bolt temporary fixing nut main body 21 has a shaft on the other end in the axial direction of the portion where the outer diameter on the outer peripheral surface is slightly larger than the diameter of the bolt hole 3 of the bottom steel plate 1. Since the locking taper surface 27 having a large inclination angle with respect to the central direction is provided, the taper portion 22 of the bolt temporary fixing nut body 21 extends from the small diameter side to the gap between the bolt hole 3 and the bolt 5 of the bottom steel plate. If the locking tapered surface 27 reaches the upper end of the bolt hole 3 of the bottom steel plate 1 when biting in, the force that bites into the gap between the bolt hole 3 and the bolt 5 is greater. Become. Therefore, the adhesion of Rubo belt temporary fixing nut body 21 against the upper end inner peripheral surface of the bolt hole 3 of the bottom steel plate 1 is increased, the upper end inner peripheral surface and the bolt temporarily fixing the nut body 21 of the bolt hole 3 (D portion in the figure) is further improved in sealing performance, and the rotation preventing action of the bolt 5 temporarily fixed by the tightening axial force with respect to the bolt temporary fixing nut main body 21 is further strengthened.

又、上記のように係止用テーパ面２７が、上記底鋼板１のボルト孔３の上端部に達することで、上記底鋼板１のボルト孔３に対するボルト仮固定ナット本体２１の縦方向位置が定まるようになることから、該ボルト仮固定ナット本体２１に対するボルト５の締め込み量が一定とされるようになる。更には、上記底鋼板１のボルト孔３が設計寸法より多少大きくなっている場合であっても、上記ボルト仮固定ナット本体２１の係止用テーパ面２７の部分が、上記底鋼板１のボルト孔３とボルト５との隙間に楔状に食い込まされることで、該ボルト仮固定ナット本体２１に対する締付け軸力によってボルト５を回転を防止した状態で、底鋼板１のボルト孔３に確実に固定されるようになる。   Further, as described above, when the locking tapered surface 27 reaches the upper end portion of the bolt hole 3 of the bottom steel plate 1, the vertical position of the bolt temporary fixing nut body 21 with respect to the bolt hole 3 of the bottom steel plate 1 is changed. Since it becomes settled, the tightening amount of the bolt 5 with respect to the bolt temporary fixing nut main body 21 becomes constant. Further, even if the bolt hole 3 of the bottom steel plate 1 is slightly larger than the design dimension, the portion of the locking taper surface 27 of the bolt temporary fixing nut body 21 is the bolt of the bottom steel plate 1. By being wedged into the gap between the hole 3 and the bolt 5, the bolt 5 is securely fixed to the bolt hole 3 of the bottom steel plate 1 in a state in which the bolt 5 is prevented from rotating by the tightening axial force against the bolt temporary fixing nut body 21. Will come to be.

更に、上記底鋼板１のボルト孔３に仮固定されるボルト５の軸部５ａは、その先端側と周りが、上記ボルト仮固定ナット本体２１の軸心方向他端側に一体に取り付けてある防錆キャップ部２５によって覆われるようになる。   Further, the shaft portion 5a of the bolt 5 temporarily fixed in the bolt hole 3 of the bottom steel plate 1 is integrally attached to the other end side in the axial direction of the bolt temporary fixing nut body 21 at the tip side and the periphery. The rust preventive cap portion 25 is covered.

上記のようにして防錆キャップ一体式ボルト仮固定ナット２０を用いて、底鋼板１のボルト孔３にボルト５を回転を防止した状態で仮固定した後は、図３（イ）に示す如く、上記ボルト孔３に仮固定してなるボルト５の頭部５ｂを含む底鋼板１の下面側の所要領域、たとえば底鋼板１の下面の全面に、先行塗装となる塗装を施すようにする。これにより、上記ボルト５の頭部５ｂと、底鋼板１の下面との間（図中のＥ個所）が塗膜１９により覆われて密閉される。   After temporarily fixing the bolt 5 in the bolt hole 3 of the bottom steel plate 1 while preventing the rotation using the rust prevention cap integrated bolt temporary fixing nut 20 as described above, as shown in FIG. The required region on the lower surface side of the bottom steel plate 1 including the head portion 5b of the bolt 5 temporarily fixed in the bolt hole 3, for example, the entire lower surface of the bottom steel plate 1, is coated with the preceding coating. As a result, the space between the head 5 b of the bolt 5 and the lower surface of the bottom steel plate 1 (E portion in the figure) is covered with the coating film 19 and sealed.

以上により、上記図中のＤ，Ｅの２個所が密閉されることで、上記防錆キャップ部２５により軸部５ａの先端側と周りが覆われているボルト５は、外気との接触が遮断されるため、該ボルト５の軸部５ａの防錆が図られるようになる。   As described above, the two parts D and E in the above figure are sealed, so that the bolt 5 whose periphery and the periphery of the shaft part 5a are covered by the antirust cap part 25 is blocked from contact with the outside air. Therefore, rust prevention of the shaft portion 5a of the bolt 5 is achieved.

その後、上記のようにして防錆が図られたボルト５がボルト孔３に取り付けてある底鋼板１は、施工現場へ搬入して、該底鋼板１を主桁上に径間方向に並べて配設した後、隣接する底鋼板１の突合せ端部同士の上側に、図３（ロ）に示す如く（図３（ロ）では片方の底鋼板１のみを示してある）、該各底鋼板１のボルト孔３と対応する位置にボルト孔４を穿設し且つ該ボルト孔４の内径を上記防錆キャップ一体式ボルト仮固定ナット２０におけるボルト仮固定ナット本体２１の円筒部や防錆キャップ部２５の外径よりも所要寸法大きな寸法としてなる添接板２を上方から載置して、該添接板２のボルト孔４に、上記底鋼板１のボルト孔３に仮固定してあるボルト５を、それぞれ上記防錆キャップ一体式ボルト仮固定ナット２０ごと挿通させるようにする。この際、上記添接板２のボルト孔４の位置を利用して、上記ボルト孔３にボルト５が仮固定してある各底鋼板１の位置を修正するようにしてもよい。   Thereafter, the bottom steel plate 1 with the bolts 5 rust-prevented as described above attached to the bolt holes 3 is carried into the construction site, and the bottom steel plates 1 are arranged in the span direction on the main girder. After installation, as shown in FIG. 3 (B) (only one bottom steel plate 1 is shown in FIG. 3 (B)) on the upper side of the butt ends of the adjacent bottom steel plates 1, each bottom steel plate 1 The bolt hole 4 is formed at a position corresponding to the bolt hole 3 and the inner diameter of the bolt hole 4 is the cylindrical portion of the bolt temporary fixing nut main body 21 or the antirust cap portion in the bolt temporary fixing nut 20 integrated with the antirust cap. A bolt that is placed from above and that is temporarily fixed to the bolt hole 3 of the bottom steel plate 1 by placing the attachment plate 2 having a required dimension larger than the outer diameter of 25 from above. 5 is inserted through the rust prevention cap integrated bolt temporary fixing nut 20 respectively. Unisuru. At this time, the position of each bottom steel plate 1 in which the bolt 5 is temporarily fixed to the bolt hole 3 may be corrected using the position of the bolt hole 4 of the attachment plate 2.

上記のようにして底鋼板１の上に添接板２を載置した後は、上記ボルト５の軸部５ａを覆っている上記防錆キャップ部２５の軸心方向他端部に設けてあるレンチ嵌着部２８に、図示しない締付け工具のソケットを嵌めて、該絞付け工具により上記レンチ嵌着部２８に対して、ボルト仮固定ナット本体２１の締め付け方向へ上記ボルト５を仮固定するためのボルト仮固定ナット本体２１の所定の締付けトルクよりも大きなトルクをかけることで、上記防錆キャップ一体式ボルト仮固定ナット２０におけるボルト仮固定ナット本体２１と防錆キャップ部２５との間に設けてある切断用溝２６の部分を破断（切断）させた後、図４（イ）に示すように、上記ボルト仮固定ナット本体２１より切り離された防錆キャップ部２５を撤去することで、上記ボルト５の軸部５ａを露出させる。   After placing the splicing plate 2 on the bottom steel plate 1 as described above, it is provided at the other axial end portion of the rust prevention cap portion 25 covering the shaft portion 5a of the bolt 5. A socket of a tightening tool (not shown) is fitted into the wrench fitting portion 28, and the bolt 5 is temporarily fixed to the wrench fitting portion 28 in the tightening direction of the bolt temporary fixing nut body 21 by the tightening tool. By applying a torque larger than a predetermined tightening torque of the bolt temporary fixing nut main body 21, it is provided between the bolt temporary fixing nut main body 21 and the antirust cap portion 25 in the antirust cap integrated bolt temporary fixing nut 20. After the portion of the cutting groove 26 is broken (cut), as shown in FIG. 4 (a), the rust preventive cap portion 25 separated from the bolt temporary fixing nut body 21 is removed, thereby Exposing the shaft portion 5a of the belt 5.

しかる後、図４（ロ）に示す如く、上記添接板２の上方へ突出している上記ボルト５の軸部５ａに、ワッシャ７を介してナット６を嵌めて、該ナット６をボルト５に対して締め込むことで、上記底鋼板１と添接板２の重ね合わせ部を、ボルト５によりそれぞれ接合する。これにより、隣接する底鋼板１の突合せ端部同士が、上記添接板２を介して連結されるようになる。   Thereafter, as shown in FIG. 4B, a nut 6 is fitted to the shaft portion 5a of the bolt 5 protruding upward from the attachment plate 2 via a washer 7, and the nut 6 is attached to the bolt 5. By tightening, the overlapping portions of the bottom steel plate 1 and the attachment plate 2 are joined by bolts 5 respectively. Thereby, the butt end portions of the adjacent bottom steel plates 1 are connected to each other via the splicing plate 2.

このように、本発明の防錆キャップ一体式ボルト仮固定ナット２０によれば、工場等にて、合成床版の底鋼板１と添接板２の接合に用いるボルト５を、上記底鋼板１のボルト孔３にボルト仮固定ナット本体２１を介して仮固定することができると共に、上記底鋼板１のボルト孔３の上端部内周面と、ボルト仮固定ナット本体２１との間を密閉できる。よって、その後、上記ボルト５の頭部５ｂを含む底鋼板１の下面への塗装を行うことで、該ボルト５を外気より遮断して軸部５ａの速やかな防錆を図ることができる。更に、このボルト５の防錆効果は、施工現場へ搬入した上記底鋼板１の上側に上記添接板２を載置した後、上記ボルト５に対するナット６の本締めを行うために、上記防錆キャップ一体式ボルト仮固定ナット２０における防錆キャップ部２５をボルト仮固定ナット本体２１より切り離して撤去するまで持続させることができる。   Thus, according to the rust preventive cap-integrated bolt temporary fixing nut 20 of the present invention, the bolt 5 used for joining the bottom plate 1 of the composite floor slab and the attachment plate 2 at the factory or the like is used as the bottom plate 1. The bolt hole 3 can be temporarily fixed via a bolt temporary fixing nut main body 21 and the inner peripheral surface of the upper end portion of the bolt hole 3 of the bottom steel plate 1 and the bolt temporary fixing nut main body 21 can be sealed. Therefore, after that, by coating the lower surface of the bottom steel plate 1 including the head portion 5b of the bolt 5, the bolt 5 can be shielded from the outside air, and the shaft portion 5a can be rusted quickly. Further, the rust preventive effect of the bolt 5 is that the bolt 6 is placed on the upper side of the bottom steel plate 1 carried into the construction site, and then the nut 6 is finally tightened on the bolt 5 in order to prevent the rust prevention effect. The rust prevention cap portion 25 in the rust cap integrated bolt temporary fixing nut 20 can be maintained until it is separated from the bolt temporary fixing nut main body 21 and removed.

更に、上記本発明の防錆キャップ一体式ボルト仮固定ナット２０は、防錆キャップ部２５をボルト仮固定ナット本体２１と一体にした構成としてあるため、上記ボルト孔３にボルト５を仮固定した状態の底鋼板１が日照に暴露されることで温度上昇し、これに伴い、ボルト孔３に仮固定されているボルト５の温度が上昇して、上記防錆キャップ部２５自体の温度が上昇しても、該防錆キャップ部２５と上記ボルト仮固定ナット本体２１との間の気密性が影響を受ける虞はない。   Furthermore, since the rust preventive cap integrated bolt temporary fixing nut 20 of the present invention has a structure in which the rust preventive cap portion 25 is integrated with the bolt temporary fixing nut main body 21, the bolt 5 is temporarily fixed to the bolt hole 3. When the bottom steel plate 1 in the state is exposed to sunlight, the temperature rises, and accordingly, the temperature of the bolt 5 temporarily fixed to the bolt hole 3 rises, and the temperature of the rust prevention cap portion 25 itself rises. Even if it does, there is no possibility that the airtightness between the rust prevention cap portion 25 and the bolt temporary fixing nut body 21 may be affected.

又、上記底鋼板１の温度変化に伴うボルト孔３に仮固定されたボルト５の温度変化に起因して、該ボルト５の軸部５ａを覆っている上記防錆キャップ部２５の内に封入されている空気が膨張、収縮して、該防錆キャップ部２５の内部の気圧が、外気圧より高くなったり低くなったりしても、上記ボルト仮固定ナット本体２１と一体物としてある防錆キャップ部２５の内部の気密性が影響を受ける虞を解消することができる。   Further, due to the temperature change of the bolt 5 temporarily fixed to the bolt hole 3 accompanying the temperature change of the bottom steel plate 1, it is enclosed in the rust prevention cap portion 25 covering the shaft portion 5 a of the bolt 5. Even if the air that has been expanded and contracted and the pressure inside the rust prevention cap portion 25 becomes higher or lower than the outside pressure, the rust prevention that is integral with the bolt temporary fixing nut main body 21 The possibility that the airtightness inside the cap portion 25 is affected can be eliminated.

なお、本発明は、上記実施の形態にのみ限定されるものではなく、ボルト仮固定ナット本体２１と防錆キャップ部２５との境界に設けた切断用溝は、底鋼板１のボルト孔３に挿通させたボルト５の軸部５ａにボルト仮固定ナット本体２１を締め込んだ状態にて、防錆キャップ部２５の軸心方向他端部に設けてあるレンチ嵌着部８に、図示しない締付け装置により更に締め付け方向へ回転させるように力を加えることで切断するものとして説明したが、上記切断用溝２６の部分を切断（破断）させることができれば、上記防錆キャップ部２５に対して軸心方向と直交する方向の力を加えることで上記切断用溝２６の部分を折るようにして切断したり、上記防錆キャップ部２５にボルト仮固定ナット本体２１より離反させる方向への力を加えて、上記切断用溝２６の部分を引きちぎるようにして切断してもよい。   The present invention is not limited to the above embodiment, and the cutting groove provided at the boundary between the bolt temporary fixing nut body 21 and the rust prevention cap portion 25 is formed in the bolt hole 3 of the bottom steel plate 1. In the state where the bolt temporary fixing nut main body 21 is tightened to the shaft portion 5a of the inserted bolt 5, the wrench fitting portion 8 provided at the other axial end of the rust prevention cap portion 25 is tightened (not shown). Although it has been described that it is cut by applying a force so as to be further rotated in the tightening direction by the apparatus, if the portion of the cutting groove 26 can be cut (broken), the shaft is placed against the rust prevention cap portion 25. By applying a force in a direction orthogonal to the center direction, the cutting groove 26 is cut so that it is folded, or a force is applied to the rust prevention cap portion 25 in a direction to separate it from the bolt temporary fixing nut body 21. And So as to tear off the portion of the serial cutting grooves 26 may be cut.

上記切断用溝２６は、断面Ｕ字状の溝として図示してあるが、ボルト仮固定ナット本体２１や防錆キャップ部２５の周壁よりも強度が低くて、両者の境界部分で切断され易くしてあれば、Ｖ字溝等、任意の断面形状の溝としてよい。   The cutting groove 26 is illustrated as a groove having a U-shaped cross section. However, the cutting groove 26 has a lower strength than the peripheral wall of the bolt temporary fixing nut body 21 and the rust prevention cap portion 25 and can be easily cut at the boundary portion between them. If there is, it may be a groove having an arbitrary cross-sectional shape such as a V-shaped groove.

更に、ボルト仮固定ナット本体２１と防錆キャップ部２５との境界部に設ける切断機構としては、当初はボルト仮固定ナット本体２１と防錆キャップ部２５との境界部分を気密に連結してあり、且つ該境界部分を必要に応じて切り離すことができるようにしてあれば、たとえば、上記ボルト仮固定ナット本体２１と防錆キャップ部２５との境界となる部分の周壁に、周方向に延びる２本の切取り用の溝を軸心方向に所要の間隔を隔てて平行に設け、必要に応じて上記２本の切取り用溝の間の部分の周方向の一個所に設けたつまみを引いて、上記２本の切取り用溝の間の部分を周方向の全周に亘り引きちぎることで、上記防錆キャップ部２５をボルト仮固定ナット本体２１より切り離す等、図示した切断用溝２６以外の任意の切断機構を採用してもよい。   Further, as a cutting mechanism provided at the boundary between the bolt temporary fixing nut body 21 and the rust prevention cap portion 25, the boundary portion between the bolt temporary fixing nut main body 21 and the rust prevention cap portion 25 is initially airtightly connected. If the boundary portion can be separated as necessary, for example, the peripheral wall of the portion serving as the boundary between the bolt temporary fixing nut body 21 and the rust prevention cap portion 25 extends in the circumferential direction 2. Two cutting grooves are provided in parallel in the axial direction with a predetermined interval, and if necessary, a knob provided at one place in the circumferential direction of the portion between the two cutting grooves is pulled, Any portion other than the illustrated cutting groove 26 such as the rust prevention cap portion 25 is separated from the bolt temporary fixing nut body 21 by tearing the portion between the two cutting grooves over the entire circumference in the circumferential direction. Adopt cutting mechanism It may be.

底鋼板１のボルト孔３に挿通させたボルト５の軸部５ａに、ボルト仮固定ナット本体２１を螺着させて締め込む際、ボルト仮固定ナット本体２１自体をチャックのような工具によりボルト仮固定ナット本体２１自体を把持して所定のトルクで回転させて締め付けることができるようにしてあれば、防錆キャップ部２５の軸心方向他端部のレンチ嵌着部２８を省略してもよい。又、この場合、上記防錆キャップ部２５の軸心方向他端側は、図示した円錐形状ではなく、軸心方向と直交する平面としたり、半球状としてもよい。   When the bolt temporary fixing nut main body 21 is screwed into the shaft portion 5a of the bolt 5 inserted into the bolt hole 3 of the bottom steel plate 1 and tightened, the bolt temporary fixing nut main body 21 itself is temporarily tightened with a tool such as a chuck. If the fixing nut main body 21 itself can be gripped and rotated with a predetermined torque so that it can be tightened, the wrench fitting portion 28 at the other axial end of the rust prevention cap portion 25 may be omitted. . In this case, the other end side in the axial center direction of the rust prevention cap portion 25 may be a flat surface orthogonal to the axial direction or a hemispherical shape instead of the illustrated conical shape.

ボルト仮固定ナット本体２１のテーパ部２２や係止用テーパ面２７の軸心方向に対する傾斜角度は、接合対象となる底鋼板１と添接板２の板厚や、ボルト５を予め取り付けるようにする一方の鋼板としての底鋼板１に設けるボルト孔３とボルト５との隙間の大きさに応じて適宜変更してもよい。   The inclination angle of the tapered portion 22 and the locking tapered surface 27 of the bolt temporary fixing nut body 21 with respect to the axial center direction is such that the thickness of the bottom steel plate 1 and the attachment plate 2 to be joined and the bolt 5 are attached in advance. Depending on the size of the gap between the bolt hole 3 and the bolt 5 provided in the bottom steel plate 1 as one of the steel plates, it may be appropriately changed.

ボルト仮固定ナット本体２１のテーパ部２２には、外周面における外径が上記底鋼板１のボルト孔３の径よりもやや太径となる部分の軸心方向他端側に、軸心方向に対する傾斜角度が大となる係止用テーパ面２７を設けることが好ましいが、該係止用テーパ面２７を省略してもよい。   The tapered portion 22 of the bolt temporary fixing nut main body 21 has an axial diameter on the other end side in the axial direction of the portion where the outer diameter on the outer peripheral surface is slightly larger than the diameter of the bolt hole 3 of the bottom steel plate 1 with respect to the axial direction. Although it is preferable to provide the locking taper surface 27 having a large inclination angle, the locking taper surface 27 may be omitted.

本発明の防錆キャップ一体式ボルト仮固定ナットは、２枚の鋼板をボルト５を用いて接合する際、一方の鋼板に設けたボルト孔に予めボルト５を脱落しないよう取り付けておくことが望まれる個所であれば、上記底鋼板１と添接板２以外のいかなる鋼板同士の接合個所にも適用してよい。   The rust preventive cap integrated bolt temporary fixing nut of the present invention is desirably attached in advance so that the bolt 5 is not dropped into the bolt hole provided in one steel plate when the two steel plates are joined using the bolt 5. As long as it is a place that can be connected, any steel plate other than the bottom steel plate 1 and the splicing plate 2 may be applied.

その他本発明の要旨を逸脱しない範囲内で種々変更を加え得ることは勿論である。   Of course, various modifications can be made without departing from the scope of the present invention.

本発明の防錆キャップ一体式ボルト仮固定ナットの実施の一形態を示すもので、（イ）は平面図、（ロ）は底鋼板のボルト孔に挿通したボルトに装着した状態を示す一部切断概略側面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a rust preventive cap-integrated bolt temporary fixing nut of the present invention. It is a cutting | disconnection schematic side view. 図１の防錆キャップ一体式ボルト仮固定ナットにおけるボルト仮固定ナット本体を拡大して示す一部切断側面図である。FIG. 2 is a partially cut-away side view showing an enlarged view of a bolt temporary fixing nut body in the rust prevention cap integrated bolt temporary fixing nut of FIG. 図１の防錆キャップ一体式ボルト仮固定ナットの使用方法を示すもので、（イ）は底鋼板のボルト孔にボルトを仮固定して該ボルトの防錆を図った状態を、（ロ）は底鋼板の上側に添接板を載置した状態をそれぞれ示す一部切断概略側面図である。Fig. 1 shows how to use the rust prevention cap-integrated bolt temporary fixing nut shown in Fig. 1. (a) shows the state in which the bolt is temporarily fixed to the bolt hole of the bottom steel plate to prevent rusting of the bolt. These are the partially cut | disconnected schematic side views which each show the state which mounted the attachment board on the upper side of the bottom steel plate. 図１の防錆キャップ一体式ボルト仮固定ナットの使用方法の図３（ロ）に続く手順を示すもので、（イ）はボルト仮固定ナット本体より防錆キャップ部を切り離して撤去する状態を、（ロ）は底鋼板と添接板をボルト止めした状態をそれぞれ示す一部切断概略側面図である。Fig. 3 shows the procedure following Fig. 3 (b) for the usage of the rust prevention cap integrated bolt temporary fixing nut in Fig. 1, and (b) shows the state in which the rust prevention cap portion is separated and removed from the bolt temporary fixing nut body. (B) is a partially cut schematic side view showing a state in which the bottom steel plate and the attachment plate are bolted. 隣接する合成床版の底鋼板の突合せ端部同士の添接板を介した一般的な連結構造を示す切断側面図である。It is a cut side view which shows the general connection structure through the joining board of the butt | matching edge parts of the bottom steel plate of an adjacent synthetic floor slab. 底鋼板のボルト孔にボルトを脱落しないよう保持させるために従来提案されている手法の一例の概要を示すもので、（イ）は底鋼板のボルト孔にボルトを保持させた状態を、（ロ）は隣接する底鋼板の上側に添接板を載置する状態を、（ハ）は隣接する底鋼板を添接板を介して連結した状態をそれぞれ示す切断側面図である。An outline of an example of a conventionally proposed method for holding the bolt in the bolt hole of the bottom steel plate is shown. (A) shows a state in which the bolt is held in the bolt hole of the bottom steel plate. (C) is a cut side view showing a state in which an attachment plate is placed on the upper side of an adjacent bottom steel plate, and (c) is a cut side view showing a state in which the adjacent bottom steel plates are connected via an attachment plate. ２枚の板の接合に用いられている締結後のボルトのねじ部とナットの防食を行うための手段の１つとして従来提案されている防食キャップを示す概要図である。It is the schematic which shows the anti-corrosion cap conventionally proposed as one of the means for performing the anti-corrosion of the thread part and bolt of the bolt after the fastening used for joining of two boards. 本発明者が先の出願で提案している締結用ボルトの防錆方法及び装置ン概要を示すもので、（イ）は底鋼板のボルト孔にボルト仮固定ナットを介してボルトを仮固定した状態を、（ロ）はボルトの頭部を含む底鋼板の下面側に塗装を施すと共にボルトに防錆キャップを装着した状態を、（ハ）は底鋼板に添接板を接合した状態をそれぞれ示す一部切断概略側面図である。1 shows an outline of a rust prevention method and apparatus for a fastening bolt proposed by the present inventor in an earlier application. (A) shows a bolt temporarily fixed to a bolt hole of a bottom steel plate through a bolt temporary fixing nut. (B) shows the state where the bottom surface of the bottom steel plate including the bolt head is painted and the rust prevention cap is attached to the bolt, and (c) shows the state where the attachment plate is joined to the bottom steel plate. It is a partially cut schematic side view shown.

符号の説明Explanation of symbols

１ 底鋼板（一方の鋼板）
２ 添接板（他方の鋼板）
３ ボルト孔
５ ボルト
５ａ 軸部
５ｂ 頭部
２０ 防錆キャップ一体式ボルト仮固定ナット
２１ ボルト仮固定ナット本体
２２ テーパ部
２５ 防錆キャップ部
２６ 切断用溝（切断機構）
２８ レンチ嵌着部 1 Bottom steel plate (one steel plate)
2 Connecting plate (the other steel plate)
3 Bolt hole 5 Bolt 5a Shaft part 5b Head 20 Anti-rust cap integrated bolt temporary fixing nut 21 Bolt temporary fixing nut body 22 Taper part 25 Anti-rust cap part 26 Cutting groove (cutting mechanism)
28 Wrench fitting part

Claims (3)

ボルトを用いて接合する２枚の重ね合わせ鋼板のうちの一方の鋼板のボルト孔よりも軸心方向の一端側が小径となるようにしてあるボルト仮固定ナット本体の軸心方向の他端側に、ボルトの軸部を覆うことができるようにしてある防錆キャップ部の開口側端部を気密状態に一体に取り付け、更に、上記ボルト仮固定ナット本体と防錆キャップ部との境界部分に、該防錆キャップ部を上記ボルト仮固定ナット本体より切り離すことができるようにする切断機構を設けてなる構成を有することを特徴とする防錆キャップ一体式ボルト仮固定ナット。   On the other end side in the axial direction of the bolt temporary fixing nut body in which one end side in the axial direction is smaller than the bolt hole of one of the two stacked steel plates to be joined using bolts. In addition, the opening side end of the rust prevention cap part that can cover the bolt shaft part is integrally attached in an airtight state, and further, at the boundary part between the bolt temporary fixing nut body and the rust prevention cap part, A rust preventive cap-integrated bolt temporary fixing nut comprising a cutting mechanism that enables the rust preventive cap portion to be separated from the bolt temporary fixing nut main body. 切断機構を、ボルト仮固定ナット本体と防錆キャップ部との境界部分の外周面に周方向に設けてなる切断用溝とした請求項１記載の防錆キャップ一体式ボルト仮固定ナット。   The rust preventive cap-integrated bolt temporary fixing nut according to claim 1, wherein the cutting mechanism is a cutting groove provided in a circumferential direction on an outer peripheral surface of a boundary portion between the bolt temporary fixing nut main body and the rust preventive cap portion. 防錆キャップ部の非開口側端部の軸心位置に、レンチ嵌着部を、軸心方向の外方へ所要寸法突出させて設けるようにした請求項１又は２記載の防錆キャップ一体式ボルト仮固定ナット。   The rust prevention cap integrated type according to claim 1 or 2, wherein a wrench fitting portion is provided at the axial center position of the end portion on the non-opening side of the rust prevention cap portion so as to project the required dimension outward in the axial direction. Bolt temporary fixing nut.
JP2008247922A 2008-09-26 2008-09-26 Rust prevention cap integrated bolt temporary fixing nut Active JP4955635B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113390182A (en) * 2021-04-30 2021-09-14 刘鹏 Air source water heater

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JPH05332334A (en) * 1992-06-03 1993-12-14 Mutsuo Goto Anchor bolt protector
JPH09250531A (en) * 1996-03-18 1997-09-22 Togo Seisakusho:Kk Corrosion-resisting method for protrudent metallic part, and corrosion-resisting cap
JPH10231822A (en) * 1997-02-19 1998-09-02 Kawanishi Suido Kiki:Kk Nut with cap
JP2004176909A (en) * 2002-11-11 2004-06-24 Kobe Steel Ltd Bolt for joining plates, and method for joining plates using the bolt

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Publication number Priority date Publication date Assignee Title
JPS58106609U (en) * 1982-01-13 1983-07-20 バブコツク日立株式会社 Stud bolt protection tube with corrosion protection device
JPS60122020U (en) * 1984-01-26 1985-08-17 株式会社クボタ Anti-corrosion cap for bolts and nuts
JPS6158724U (en) * 1984-09-25 1986-04-19
JPS6232213U (en) * 1985-08-13 1987-02-26
JPS6235109U (en) * 1985-08-20 1987-03-02
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JPH01154318U (en) * 1988-04-19 1989-10-24
JPH05332334A (en) * 1992-06-03 1993-12-14 Mutsuo Goto Anchor bolt protector
JPH09250531A (en) * 1996-03-18 1997-09-22 Togo Seisakusho:Kk Corrosion-resisting method for protrudent metallic part, and corrosion-resisting cap
JPH10231822A (en) * 1997-02-19 1998-09-02 Kawanishi Suido Kiki:Kk Nut with cap
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113390182A (en) * 2021-04-30 2021-09-14 刘鹏 Air source water heater

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