JP4137531B2

JP4137531B2 - Concrete product lifting equipment

Info

Publication number: JP4137531B2
Application number: JP2002183346A
Authority: JP
Inventors: 正己入来院; 義藤澤
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-05
Filing date: 2002-06-24
Publication date: 2008-08-20
Anticipated expiration: 2020-03-09
Also published as: JP2003112884A

Description

【０００１】
【発明の属する技術分野】
この発明は、コンクリート製品の吊上具に係わり、さらに詳しくは暗渠・大型コンクリート板・大型コンクリートブロック等の重量のあるコンクリート製品を移動、運送のためにクレーン装置で吊り上げる際に使用される吊部材と、コンクリート製品に埋設された定着部材との係合構造に関する。
【０００２】
【従来の技術】
暗渠等の重量あるコンクリート製品を移動・運送・設置するため、クレーン装置を用いて吊り上げ、吊り降ろして運送車への積載、荷降ろし、設置をしているが、その吊りワイヤーのフックをコンクリート製品に掛け止めするため、コンクリート製品に定着部材を埋設し、該定着部材に吊部材を挿入係止するようにしている。
【０００３】
従来、コンクリート製品の吊上具として、内周面に雌ネジを形成した有底円筒状の定着部材をコンクリート製品に埋設し、この定着部材の雌ネジに吊りボルトを螺合するようにしたものが提案されている。
【０００４】
上記従来の吊上具では、コンクリート製品の複数箇所に吊りボルトを螺着する必要があるので、脱着作業が面倒であるという問題があった。又、コンクリート製品を工場や現場に仮置きしている間に、砂や埃が定着部材の内部に侵入し、雌ネジの溝部に堆積すると、コンクリート製品の敷設作業時に吊りボルトを雌ネジに螺合することが不完全となり、吊り上げ動作に支障をきたすことがあった。
【０００５】
一方、上記従来のコンクリート製品の吊上具に存する問題点を解消するため、非ねじ込み式の吊り構造として、特開平１０−２８０６９４号公報に示すコンクリート製品の吊下用キャップが提案されている。このコンクリート製品の吊上具は、図１５に示すように、ロープ等を取り付ける吊部材５０と、コンクリート製品に埋め込まれる定着部材６０との脱着を、ネジを回すことなく簡単に行うことができる吊上具である。
【０００６】
上記の吊部材５０は、クレーン装置のワイヤーフック掛止用の環体５１を有するとともに、軸体５２の先端にその軸線方向と直角方向に突設された係止突起５３を有している。又、定着部材６０の通孔６１には、基端から先端に向かって対向するように溝部６２が設けられている。通孔６１の内端部には係止突起５３が嵌合される窪み部６３が溝部６２から周方向に位相をずらせて形成されている。そして、この吊部材５０の係止突起５３を溝部６２に合わせて挿入した後、９０度回転させたところで吊部材５０を引き上げて係止突起５３を窪み部６３に嵌め込み、吊部材５０を係合し、コンクリート製品を吊り上げる。
【０００７】
【発明が解決しようとする課題】
ところが、上記従来のコンクリート製品の吊上具においては、吊部材５０の定着部材６０への脱着を容易に行うことができる反面、吊部材５０の係止突起５３を案内する溝部６２を定着部材に形成する必要がある。このため、定着部材６０の外径が大きくなり、定着部材６０の材料費を節減することができないという問題があった。又、定着部材６０の外径を小さく設定した場合には吊部材５０の軸径を小さくする必要が生じる。この場合には、吊部材５０の強度不足を生ずるという問題がある。
【０００８】
この発明は、上記従来の技術に存する問題点を解消するためになされたものであって、その目的は定着部材の断面形状を簡素化して小型化を図ることができるとともに、軸本体の中間部から座金とコイルバネが外れるのを防止でき、定着部材への吊部材の脱着を容易に行うことができるコンクリート製品の吊上具を提供することにある。
【０００９】
【課題を解決するための手段】
上記問題点を解決するために、請求項１に記載の発明は、コンクリート製品の吊り位置に定着部材を埋設し、軸体と環体よりなる吊部材の前記軸体を前記定着部材の挿入孔に挿入して回転させることにより吊部材をコンクリート製品に係合するように構成したコンクリート製品の吊上具において、前記定着部材は挿入孔を有する定着部材本体と、該定着部材本体の内端側に形成した嵌入穴に嵌入された抜出阻止体と、前記定着部材本体の内端開口を閉塞する蓋体とにより構成され、前記吊部材の軸本体の外径を前記定着部材の挿入孔の内径とほぼ同一とし、軸本体の先端部に縮径部を介して前記挿入孔の内径より短くかつ縮径部よりも長い寸法の係止突起を設け、前記抜出阻止体に対し前記定着部材の内端付近に前記係止突起を挿入できる開口を設け、前記抜出阻止体の裏面に対し前記開口から軸体の軸線の周りで所定角度だけ回動された前記係止突起の抜け出しを阻止する抜出阻止部を設け、前記定着部材本体に対し、前記縮径部の形成範囲内において、前記開口と対応して該開口を延長するように扁平筒部を設け、前記軸本体の基端部には円環状の環体が別部材として連結され、軸本体の中間部には段差部が形成され、該段差部と環体との間には小径部が形成され、前記段差部に係止された座金と環体との間には、コイルバネが介在されていることを要旨とする。
【００１０】
請求項２記載の発明は、請求項１において、前記段差部の上方の小径部の上端部には雄ネジ部が形成され、この雄ネジ部は前記環体に形成した雌ネジ部に螺合され、前記環体と雄ネジ部にはボルトが小径部の軸線と直交する方向に螺合され、雄ネジ部と環体が連結されていることを要旨とする。
【００１２】
請求項３に記載の発明は、請求項１において、前記扁平筒部の上部には前記係止突起を前記挿入孔から扁平筒部内に案内するテーパ筒部が設けられていることを要旨とする。
請求項４に記載の発明は、前記抜出阻止体の係止溝は、扁平筒部の両側方に形成された前記凹部と対応して設けられ、定着部材本体の嵌入穴の底壁部、係止突起及び係止溝の吊り上げ力伝達面は、外側方ほど下となる傾斜面となっていることを要旨とする。
【００１３】
【発明の実施の形態】
以下、本発明を説明するに先立ち、本発明と関係するコンクリート製品Ｃの吊上具の形態を図１〜図４に基づいて説明する。
【００１４】
図１に示すように、コンクリート製品Ｃの吊上具は、コンクリート製品Ｃに埋設固定された定着部材１１と、該定着部材１１に取り外し可能に装着される吊部材１２とから構成されている。
【００１５】
前記吊部材１２は定着部材１１に差し込まれる軸体１３と、該軸体１３に装着された環体１４とにより構成されている。前記軸体１３は横円柱状の軸本体１３ａと、この軸本体１３ａの先端部に形成した縮径部１３ｂと、この縮径部１３ｂの先端部に一体形成した係止突起１３ｃとを備えている。又、前記係止突起１３ｃの先端面には先細り部１３ｄが形成されている。前記軸本体１３ａの基端部には係止フランジ１３ｅが一体に形成され、該係止フランジ１３ｅの外側面には軸体１３を回動する操作つまみ１３ｆが一体に形成されている。
【００１６】
前記環体１４は逆Ｕ字状をなし、その両端に一体形成された左側リング部１４ａ，右側リング部１４ｂが軸本体１３ａの外周に軸線方向の移動可能に緩く嵌合されている。前記軸本体１３ａの外周に形成した環状溝１３ｇには、前記両リング部１４ａ，１４ｂの間に位置するようにストップリング１６が嵌合されている。軸本体１３ａの外周には、ワッシャー１７が緩く嵌合され、このワッシャー１７と前記ストップリング１６との間には、付勢手段としてのコイルバネ１５が介在されている。前記環体１４には図３に示すようにクレーン等のワイヤーの下端に設けた吊りフック１８が係止される。
【００１７】
次に、前記定着部材１１の構成について説明すると、横円筒状をなす定着部材本体２１には、前記軸本体１３ａを挿入する挿入孔２１ａが形成され、該定着部材本体２１の内端部には挿入孔２１ａの径よりも大径の嵌入穴２１ｂが形成されている。又、前記定着部材本体２１の外周には複数箇所（４箇所）に離脱防止突条２１ｃが一体的に形成され、コンクリート製品Ｃに埋設した定着部材本体２１が所定位置に固定されるようになっている。
【００１８】
前記定着部材本体２１の嵌入穴２１ｂには抜出阻止体２２が嵌入され、定着部材本体２１の内端開口部に嵌合した蓋体２３により閉塞されている。この抜出阻止体２２の中央部には前記軸体１３の係止突起１３ｃを挿通するための縦長長方形状をなす開口２２ａが形成され、抜出阻止体２２の裏面側には開口２２ａを通過した係止突起１３ｃを係合し得る抜出阻止部としての係止溝２２ｂが切り欠き形成されている。前記抜出阻止体２２の外面側には前記係止突起１３ｃに形成した先細り部１３ｄと対応するようにガイドピン２４が２箇所に形成されている。又、前記抜出阻止体２２の裏面側には前記係止溝２２ｂの近傍に位置するように一対の回動方向規制ピン２５が植設されている。この回動方向規制ピン２５によって係止突起１３ｃが一方向にのみ回動するようにしている。前記蓋体２３と抜出阻止体２２との間には、係止突起１３ｃの回動許容空間Ｓが形成されている。
【００１９】
前記定着部材本体２１と蓋体２３は例えば硬質合成樹脂材によりそれぞれ一体的に構成されている。又、抜出阻止体２２は金属材料により一体形成されている。前記定着部材本体２１の挿入孔２１ａの内径は、軸本体１３ａの外径より僅かに大きく、つまりほぼ同一径に形成され、係止突起１３ｃの長さは軸本体１３ａの外径とほぼ同じ長さに形成されている。
【００２０】
次に、前記のように構成したコンクリート製品Ｃの吊上具について、その動作を説明する。
図１は定着部材１１がコンクリート製品Ｃの所定位置に埋設され、軸体１３と環体１４とからなる吊部材１２がコンクリート製品Ｃの定着部材１１から離脱された状態を示す。この状態において、環体１４はコイルバネ１５によって軸本体１３ａの先端側に付勢され、環体１４の右側リング部１４ｂの内側壁がストップリング１６に押圧された状態となっている。
【００２１】
この状態において、軸体１３の軸本体１３ａを定着部材１１の挿入孔２１ａ内に挿入すると、図２に示すように係止突起１３ｃが抜出阻止体２２の開口２２ａを通過して回動許容空間Ｓに進入する。この挿入動作途中において、係止突起１３ｃが抜出阻止体２２の開口２２ａと対応していない場合には、先細り部１３ｄがガイドピン２４に接触して係止突起１３ｃが開口２２ａと対応する位置に案内回動され、係止突起１３ｃが開口２２ａを円滑に通過する。
【００２２】
図２に示すように係止突起１３ｃが回動許容空間Ｓに移動した状態においては、環体１４の左側リング部１４ａがコンクリート製品Ｃの表面に押圧されるとともに、コイルバネ１５がストップリング１６により左方に押動されて蓄勢されている。そして、つまみ１３ｆを回動して軸本体１３ａ及び係止突起１３ｃを一方向、すなわち、回動方向規制ピン２５と反対方向にほぼ９０度回動すると、図３に鎖線で示すように係止突起１３ｃが係止溝２２ｂと対応する位置に回動される。さらに、つまみ１３ｆの回動を止めて軸体１３から手を放すと、コイルバネ１５の蓄勢力により図３に実線で示すように係止突起１３ｃの両先端部が係止溝２２ｂに係合される。この状態においても、コイルバネ１５によって環体１４の左側リング部１４ａがコンクリート製品Ｃの表面に押圧され、軸体１３はコイルバネ１５によって外方向に付勢される。
【００２３】
この状態でクレーン等により吊りフック１８を吊り上げるとコンクリート製品Ｃが吊り上げられる。なお、前記軸体１３の取り外しは、前述した挿入及び係止作業と逆の手順によって行われる。
【００２４】
次に、前記のように構成したコンクリート製品Ｃの吊上具についてその効果を構成とともに列記する。
（１）前記実施形態では、軸本体１３ａの先端部に縮径部１３ｂを設け、この縮径部１３ｂの先端部に軸本体１３ａの外径よりも短い長さの係止突起１３ｃを設け、該係止突起１３ｃを抜出阻止体２２の開口２２ａを通過させて係止溝２２ｂに係合するように構成した。このため、定着部材本体２１の挿入孔２１ａを単に円筒形状に形成するのみでよく、外径を小さくして小型化できるとともに、構造を簡素化して製造を容易に行うことができる。
【００２５】
（２）前記実施形態では、前記挿入孔２１ａを円筒状に形成したので、定着部材本体２１をコンクリート製品Ｃに埋設する際に、円柱状をなす取付金具（図示略）を挿入孔２１ａに隙間無く挿入することができ、セメントミルクの挿入孔２１ａ内の侵入を防止することができ、挿入孔２１ａに対する軸本体１３ａの挿入動作を円滑に行うことができる。
【００２６】
（３）前記実施形態では、定着部材本体２１の挿入孔２１ａの内径と、軸本体１３ａの外径をほぼ同一としたので、コンクリート製品Ｃを吊り上げる際に軸本体１３ａの外周面が挿入孔２１ａの内周面に対し広い面積で接触して吊り上げ力を伝達することができ、定着部材本体２１の損傷を抑制することができる。
【００２７】
（４）前記実施形態では、定着部材本体２１と抜出阻止体２２を分割形成したので、強度の最も必要とされる抜出阻止体２２のみを金属材料により構成して吊上力を確実に受け止めることができる。
【００２８】
（５）前記実施形態では、抜出阻止体２２の外面側にガイドピン２４を設け、軸体１３の係止突起１３ｃに先細り部１３ｄを形成したので、係止突起１３ｃを抜出阻止体２２の開口２２ａに迅速に案内移動して通過させることができる。
【００２９】
（６）前記実施形態では、抜出阻止体２２の裏面側に回動方向規制ピン２５を設けたので、軸体１３を一方向に回動するのみで係止突起１３ｃを係止溝２２ｂに迅速に移動して係合することができる。
【００３０】
（７）前記実施形態では、環体１４をコイルバネ１５によってコンクリート製品Ｃの外表面に押圧する方向に付勢したので、環体１４を吊りフック１８によって吊り上げる際、その力をコンクリート製品Ｃの最短位置において伝達することができ、吊り上げ荷重による軸本体１３ａの曲げモーメントを少なくすることができる。
【００３１】
次に、本発明の吊上具の一実施形態を図５〜図８に基づいて説明する。
○ 図５〜図８において、コンクリート製品Ｃが例えばＵ字状の側溝コンクリート製品の上部を遮蔽する蓋体コンクリート製品Ｃである場合に、その蓋体コンクリート製品Ｃに対し縦方向に貫通するように定着部材１１を埋設している。図６に示すように蓋体２３は円筒状の本体２３ａと、その外周に一体形成したフランジ部２３ｂと、本体２３ａの下端部に一体形成した底板２３ｃとにより構成され、底板２３ｃの外周縁には蓋体２３自体に水抜き通路を形成するための円環状の切り離し溝２３ｄが形成されている。
【００３２】
前記定着部材本体２１の上端開口部には合成樹脂製のキャップ３１が嵌合されるようにしている。このキャップ３１は前記挿入孔２１ａに嵌入される円筒状の本体３１ａと、その上端外周に一体形成され、定着部材本体２１の上端縁に係止されるフランジ部３１ｂと、フランジ部３１ｂの内周に碁盤目状に一体形成された水抜き通路３１ｃとにより構成されている。
【００３３】
なお、前記定着部材本体２１の嵌入穴２１ｂの内部には前記抜出阻止板２２１及び位置規制部材２２２の開口２２ａの両端部に挿通されて、抜出阻止板２２１及び位置規制部材２２２の回動を規制する一対の回動規制片２１ｊが一体に形成されている。
【００３４】
図５に示すように、軸体１３の軸本体１３ａの中間部には段差部１３ｋが形成され、その上方の小径部１３ｌの上端部には雄ネジ部１３ｍが形成されている。
この雄ネジ部１３ｍは環体１４Ａに形成した雌ネジ部１４ｄに螺合されている。
前記小径部１３ｌには座金３２が緩く嵌合され、該座金３２と環体１４Ａの間にはコイルバネ１５が介在されている。前記環体１４Ａと雄ネジ部１３ｍにはボルト３３が小径部１３ｌの軸線と直交する方向に螺合され、雄ネジ部１３ｍと環体１４Ａが連結されている。この吊上具は、前記定着部材本体２１に対し、前記縮径部１３ｂの形成範囲内において前記抜出阻止体２２の開口２２ａと対応して、該開口２２ａを延長するように扁平筒部２１ｅを設けている。すなわち、通路の断面形状が長方形状の開口２２ａと同様に前記扁平筒部２１ｅの通路断面形状も長方形状に形成されている。前記扁平筒部２１ｅの上部には前記係止突起１３ｃを前記挿入孔２１ａから扁平筒部２１ｅに案内するテーパ筒部２１ｆが設けられている。
【００３５】
上記のように構成した吊上具の吊部材１２は、定着部材１１に対し前述した挿入方法とほぼ同様にして挿入される。これを簡単に説明すると、図示しないが、吊部材１２の軸体１３を定着部材本体２１の挿入孔２１ａに挿入して、係止突起１３ｃをコイルバネ１５の付勢力に抗して開口２２ａから下方に移動する。その後、環体１４Ａを４５度回転して手を離すと、図５に示すように係止突起１３ｃが係止溝２２ｂに係止される。この係止状態は座金３２とコイルバネ１５により安定して保持される。吊部材１２の離脱操作は前述した挿入方法と逆の手順により行われる。
【００３６】
蓋体コンクリート製品ＣがＵ字溝に設置される直前には、底板２３ｃが切り離し溝２３ｄから分離されて水抜き通路が形成される。製品の設置後には、図７に示すように定着部材本体２１の挿入孔２１ａの上端部にキャップ３１が嵌合される。このため、定着部材１１全体が上下方向に貫通状態となって、定着部材１１が水抜き孔として機能する。従って、図８に鎖線で示すように蓋体コンクリート製品Ｃの端縁に従来形成されていた水抜き用の凹部を省略することができる。
又、この実施形態では、扁平筒部２１ｅにより形成される左右一対の凹部２１ｇ内にコンクリート製品Ｃの一部が進入するので、係止突起１３ｃから抜出阻止板２２１及び凹部２１ｇの底壁部２１ｈを介してコンクリート製品Ｃに吊り上げ力が伝達される。このため定着部材本体２１の外周面に離脱防止突条２１ｃを形成しなくても済み、定着部材本体２１の外径寸法を短くして小型化することができる。さらに、定着部材本体２１の成形型を簡素化してその製造を容易に行うこともできる。さらに、この実施形態では、扁平筒部２１ｅの上部にテーパ筒部２１ｆを設けたので、係止突起１３ｃを挿入孔２１ａから開口２２ａに導入する作業を円滑に行うことができる。
【００３７】
次に、前記実施形態の別例を図９〜図１４に基づいて順次説明する。
○ 図９に示す別例は、係止突起１３ｃを縮径部１３ｂの先端部の片側のみに形成したものである。この別例では、材料費を節減することができる。
【００３８】
○ 図１０（ａ）に示す別例は、前記軸体１３の係止突起１３ｃの形状を四角形状にしている。又、図１０（ｂ）に示すように三角形状に形成してもよい。
○ 図１１及び図１２に示す別例は縦吊り方式のものである。この吊上具は、前記定着部材本体２１に対し、前記縮径部１３ｂの形成範囲内において前記抜出阻止体２２の開口２２ａと対応して、該開口２２ａを延長するように扁平筒部２１ｅを設けている。すなわち、通路の断面形状が長方形状の開口２２ａと同様に前記扁平筒部２１ｅの通路断面形状も長方形状に形成されている。前記扁平筒部２１ｅの上部には前記係止突起１３ｃを前記挿入孔２１ａから扁平筒部２１ｅに案内するテーパ筒部２１ｆが設けられている。
【００３９】
前記抜出阻止体２２は前記嵌入穴２１ｂの内頂部に嵌入接着され、かつ開口２２ａを形成した金属製又は硬質合成樹脂製の抜出阻止板２２１と、該抜出阻止板２２１の下面に接着され、かつ開口２２ａ及び係止溝２２ｂを備えた位置規制部材２２２とにより構成されている。前記軸体１３の軸本体１３ａの上端部にはネジ孔１３ｈが形成され、環体１４Ａに溶接したボルト２６が螺合されている。
【００４０】
上記の別例では、扁平筒部２１ｅにより形成される左右一対の凹部２１ｇ内にコンクリート製品Ｃの一部が進入するので、係止突起１３ｃから抜出阻止板２２１及び凹部２１ｇの底壁部２１ｈを介してコンクリート製品Ｃに吊り上げ力が伝達される。このため定着部材本体２１の外周面に離脱防止突条２１ｃを形成しなくても済み、定着部材本体２１の外径寸法を短くして小型化することができる。又、定着部材本体２１の成形型を簡素化してその製造を容易に行うこともできる。さらに、上記の別例では、扁平筒部２１ｅの上部にテーパ筒部２１ｆを設けたので、係止突起１３ｃを挿入孔２１ａから開口２２ａに導入する作業を円滑に行うことができる。
【００４１】
○ 図１３に示す別例は、軸体１３の軸本体１３ａの下端部と縮径部１３ｂの上端部との境界部に三角板状の補強リブ１３ｉを一体的に形成している。この別例では軸本体１３ａと縮径部１３ｂの連結強度を向上することができる。
【００４２】
○ 図１３に示す別例において、係止突起１３ｃの上面１３ｊ、抜出阻止板２２１及び凹部２１ｇの底壁部２１ｈの吊り上げ力を伝達する接触面を、外側方ほど下になる傾斜面に形成してもよい。この場合には矢印で示すように係止突起１３ｃによる吊り上げ力が斜め外側上方に伝達されるので、凹部２１ｇに進入したコンクリート製品Ｃを広範囲にわたって効率的に押圧し、吊り上げ力の分担能力を向上することができる。
【００４３】
○ 図１４に示す別例は、定着部材本体２１の上端部に段差部２１ｉを形成し、コイルバネ１５を収容するようにしている。この別例ではコイルバネ１５が外部に配置されているので、吊部材１２が定着部材１１に適正に係止されているか否かを容易に判断することができる。
【００４４】
○ 図示しないが、抜出阻止体２２を定着部材本体２１にインサート成型して定着部材１１を構成してもよい。
○ 図示しないが、抜出阻止体２２の係止溝２２ｂに代えて突条を形成し、係止突起１３ｃ側に突条を係止する係止凹部を設けてもよい。
【００４５】
○ 前記定着部材の材料として、ポリプロピレン樹脂あるいは６．６ナイロンにガラス繊維を３０％含有させたものを用いることもできる。抜出阻止体２２の材料として例えば６．６ナイロンにガラス繊維を３０％含有させた高強度合成樹脂を用い、定着部材本体２１の材料としてポリプロピレン樹脂等の硬質合成樹脂を用いることもできる。
【００４６】
次に、前記実施形態から把握される請求項以外の技術思想について、以下に説明する。
【００４７】
（技術思想１）コンクリート製品（Ｃ）の吊り位置に定着部材（１１）を上下方向に貫通して埋設し、軸体（１３）と環体（１４Ａ）よりなる吊部材（１２）の前記軸体（１３）を前記定着部材（１１）の挿入孔（２１ａ）に挿入して回転させることにより吊部材（１２）をコンクリート製品に係合するように構成した縦吊り用コンクリート製品において、
前記吊部材（１２）の軸本体（１３ａ）の外径を前記定着部材（１１）の挿入孔（２１ａ）の内径とほぼ同一とし、軸本体（１３ａ）の先端部に縮径部（１３ｂ）を介して前記挿入孔（２１ａ）の内径より短くかつ縮径部（１３ｂ）よりも長い寸法の係止突起（１３ｃ）を設け、前記定着部材（１１）の内端付近に前記係止突起（１３ｃ）を挿入できる開口（２２ａ）を有する抜出阻止体（２２）を設け、該抜出阻止体（２２）の裏面に対し前記開口（２２ａ）から軸体（１３）の軸線の周りで所定角度だけ回動された前記係止突起（１３ｃ）の抜け出しを阻止する抜出阻止部（２２ｂ）を設け、前記定着部材本体（２１）の内端側に形成した嵌入穴（２１ｂ）は、蓋体（２３）により閉塞され、該蓋体（２３）には、該蓋体自体に水抜き通路を形成するための環状の切り離し溝（２３ｄ）又は破壊可能な薄肉部が形成され、定着部材本体（２１）の上端側に形成した挿入孔（２１ａ）には、コンクリート製品の設置後に水抜き通路（３１ｃ）を有するキャップ（３１）を嵌合するように構成した縦吊り用コンクリート製品。
【００４８】
この縦吊り用コンクリート製品は、使用状態において、製品の吊り上げに用いる定着部材（１１）を水抜き通路として機能させることができるので、専用の水抜き通路を形成する必要がなく、製造を容易に行うことができる。
【００４９】
【発明の効果】
請求項１に記載の発明は、定着部材本体の構造を簡素化して、小型化を図ることができるとともに、軸本体の中間部から座金とコイルバネが外れるのを防止でき、定着部材への吊部材の脱着を容易に行うことができる。
【００５０】
請求項１記載の発明は、定着部材本体に対し、縮径部の形成範囲内において、開口と対応するように扁平筒部を設けたので、定着部材本体に扁平筒部と対応して凹部が形成され、この凹部にコンクリートが進入するので、定着部材本体の外周に離脱防止突条を形成しなくてもよく、従って、定着部材本体の型成形を容易に行うことができ、材料費を節減することができる。
【００５１】
請求項３記載の発明は、扁平筒部の上部には係止突起を挿入孔から扁平筒部に案内するテーパ筒部が設けられているので、係止突起の挿入作業を容易に行うことができる。
請求項４記載の発明は、コンクリート製品Ｃの吊り上げ力を増大することができる。
【図面の簡単な説明】
【図１】この発明を具体化したコンクリート製品の吊上具を示す断面図。
【図２】定着部材に軸体を挿入した状態を示す断面図。
【図３】定着部材に軸体の係止突起を係合した状態を示す断面図。
【図４】定着部材と吊部材の軸体を分解して示す斜視図。
【図５】この発明を縦吊り構造に具体化した断面図。
【図６】図５の定着部材の分解斜視図。
【図７】図５の定着部材の縦断面図。
【図８】図５の定着部材を用いたコンクリート製品の斜視図。
【図９】軸体の係止突起の別例を示す斜視図。
【図１０】（ａ）及び（ｂ）は開口及び係止突起の別例を示す正面図。
【図１１】吊上具を縦吊り構造に具体化した断面図。
【図１２】図１１の吊上具の分解斜視図。
【図１３】吊上具を縦吊り構造に具体化した一部破断正面図。
【図１４】吊上具を縦吊り構造に具体化した断面図。
【図１５】従来の吊上具を分離して示す断面図。
【符号の説明】
１１…定着部材、１２…吊部材、１３…軸体、１３ａ…軸本体、１３ｂ…縮径部、１３ｃ…係止突起、１３ｅ…係止フランジ、１４Ａ…環体、１５…コイルバネ、２１…定着部材本体、２１ａ…挿入孔、２１ｂ…嵌入穴、２１ｅ…扁平筒部、２１ｆ…テーパ筒部、２１ｇ…凹部、２１ｈ…底壁部、２２…抜出阻止体、２２ａ…開口、２２ｂ…抜出阻止部としての係止溝、２３…蓋体、２５…回動規制部としての回動方向規制ピン。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lifting device for concrete products, and more specifically, a lifting member used when lifting heavy concrete products such as culverts, large concrete plates, large concrete blocks, etc. with a crane device for transportation and transportation. And an engaging structure with a fixing member embedded in a concrete product.
[0002]
[Prior art]
In order to move, transport, and install heavy concrete products such as underdrains, they are lifted and suspended using a crane device, loaded onto a transport vehicle, unloaded, and installed. Therefore, a fixing member is embedded in the concrete product, and a suspension member is inserted and locked to the fixing member.
[0003]
Conventionally, as a lifting tool for concrete products, a bottomed cylindrical fixing member with an internal thread formed on the inner peripheral surface is embedded in a concrete product, and a suspension bolt is screwed onto the fixing member's internal thread. Has been proposed.
[0004]
The conventional lifting tool has a problem that it is troublesome to detach and attach the suspension bolts at a plurality of locations of the concrete product. Also, if sand or dust enters the fixing member and temporarily accumulates in the groove of the female screw while the concrete product is temporarily placed in a factory or on-site, the suspension bolt is screwed onto the female screw when laying the concrete product. There was a problem that the lifting operation was hindered.
[0005]
On the other hand, in order to solve the above-described problems of existing concrete product lifting tools, a concrete product suspension cap disclosed in Japanese Patent Laid-Open No. 10-280694 has been proposed as a non-screw-type suspension structure. As shown in FIG. 15, the concrete product lifting tool is a suspension that can be easily attached to and detached from the suspension member 50 to which a rope or the like is attached and the fixing member 60 embedded in the concrete product without turning a screw. It is an upper tool.
[0006]
The suspension member 50 includes a ring body 51 for hooking a wire hook of a crane device, and a locking projection 53 that protrudes in a direction perpendicular to the axial direction of the shaft body 52. Further, a groove 62 is provided in the through hole 61 of the fixing member 60 so as to be opposed from the base end toward the tip end. On the inner end portion of the through hole 61, a recess portion 63 into which the locking projection 53 is fitted is formed with a phase shifted from the groove portion 62 in the circumferential direction. And after inserting the latching protrusion 53 of this suspension member 50 according to the groove part 62, when it rotated 90 degree | times, the suspension member 50 is pulled up, the latching protrusion 53 is engage | inserted in the hollow part 63, and the suspension member 50 is engaged. And lift the concrete product.
[0007]
[Problems to be solved by the invention]
However, in the above-described conventional lifting device for concrete products, the suspending member 50 can be easily attached to and detached from the fixing member 60, but the groove 62 that guides the locking protrusion 53 of the suspending member 50 is used as the fixing member. Need to form. For this reason, there is a problem that the outer diameter of the fixing member 60 is increased, and the material cost of the fixing member 60 cannot be reduced. Further, when the outer diameter of the fixing member 60 is set to be small, it is necessary to reduce the shaft diameter of the suspension member 50. In this case, there is a problem that the strength of the suspension member 50 is insufficient.
[0008]
The present invention has been made to solve the above-described problems in the prior art, and its purpose is to simplify the cross-sectional shape of the fixing member to reduce the size, and to achieve an intermediate portion of the shaft body. An object of the present invention is to provide a lifting tool for a concrete product that can prevent the washer and the coil spring from being detached from the fixing member and can easily attach and detach the hanging member to and from the fixing member.
[0009]
[Means for Solving the Problems]
  In order to solve the above problems, the invention according to claim 1 is characterized in that a fixing member is embedded in a concrete product suspension position, and the shaft body of the suspension member composed of a shaft body and an annular body is inserted into the insertion hole of the fixing member. In a concrete product lifting tool configured to engage and suspend a suspension member into a concrete product by being inserted into and rotated,The fixing member has a fixing member main body having an insertion hole, an extraction preventing body inserted into an insertion hole formed on the inner end side of the fixing member main body, and a lid body that closes the inner end opening of the fixing member main body. Composed ofThe outer diameter of the shaft body of the suspension member is substantially the same as the inner diameter of the insertion hole of the fixing member, and is shorter than the inner diameter of the insertion hole through the reduced diameter portion at the distal end portion of the shaft body and longer than the reduced diameter portion. Provided with a locking projection,Against the withdrawal blockerAn opening through which the locking projection can be inserted near the inner end of the fixing memberTheProvided,AboveAn extraction preventing portion for preventing the locking protrusions that have been turned from the opening by a predetermined angle around the axis of the shaft body from the opening on the back surface of the extraction preventing body;In the fixing member main body, a flat cylindrical portion is provided so as to extend the opening corresponding to the opening within the range of formation of the reduced diameter portion,An annular ring is connected to the base end portion of the shaft body as a separate member, a step portion is formed in the middle portion of the shaft body, and a small diameter portion is formed between the step portion and the ring body. The gist is that a coil spring is interposed between the washer locked to the stepped portion and the ring.
[0010]
  According to a second aspect of the present invention, in the first aspect, a male screw portion is formed at an upper end portion of the small diameter portion above the stepped portion, and the male screw portion is screwed into a female screw portion formed in the ring body. The gist is that a bolt is screwed into the ring body and the male screw portion in a direction perpendicular to the axis of the small diameter portion, and the male screw portion and the ring body are connected.
[0012]
  Claim3The invention described in claim1The gist of the invention is that a tapered cylinder part is provided on the upper part of the flat cylinder part to guide the locking projection from the insertion hole into the flat cylinder part.
According to a fourth aspect of the present invention, the locking groove of the extraction preventing body is provided corresponding to the concave portion formed on both sides of the flat cylindrical portion, and the bottom wall portion of the insertion hole of the fixing member main body, The gist is that the lifting force transmission surfaces of the locking projections and the locking grooves are inclined surfaces that become lower toward the outer side.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, prior to describing the present invention, the form of a lifting tool for a concrete product C related to the present invention will be described with reference to FIGS.
[0014]
As shown in FIG. 1, the lifting tool for the concrete product C includes a fixing member 11 embedded and fixed in the concrete product C, and a hanging member 12 that is detachably attached to the fixing member 11.
[0015]
The suspension member 12 includes a shaft body 13 inserted into the fixing member 11 and a ring body 14 attached to the shaft body 13. The shaft body 13 includes a horizontal cylindrical shaft main body 13a, a reduced diameter portion 13b formed at the distal end portion of the shaft main body 13a, and a locking projection 13c integrally formed at the distal end portion of the reduced diameter portion 13b. Yes. Further, a tapered portion 13d is formed on the distal end surface of the locking projection 13c. A locking flange 13e is integrally formed at the base end portion of the shaft body 13a, and an operation knob 13f for rotating the shaft body 13 is formed integrally on the outer surface of the locking flange 13e.
[0016]
The ring body 14 has an inverted U shape, and a left ring portion 14a and a right ring portion 14b integrally formed at both ends thereof are loosely fitted to the outer periphery of the shaft body 13a so as to be movable in the axial direction. A stop ring 16 is fitted in an annular groove 13g formed on the outer periphery of the shaft body 13a so as to be positioned between the ring portions 14a and 14b. A washer 17 is loosely fitted on the outer periphery of the shaft main body 13a, and a coil spring 15 as an urging means is interposed between the washer 17 and the stop ring 16. As shown in FIG. 3, a suspension hook 18 provided at the lower end of a wire such as a crane is engaged with the ring body 14.
[0017]
Next, the configuration of the fixing member 11 will be described. The fixing member main body 21 having a horizontal cylindrical shape is formed with an insertion hole 21a for inserting the shaft main body 13a, and the inner end of the fixing member main body 21 is formed. An insertion hole 21b having a diameter larger than that of the insertion hole 21a is formed. Further, on the outer periphery of the fixing member main body 21, detachment preventing protrusions 21c are integrally formed at a plurality of places (four places), and the fixing member main body 21 embedded in the concrete product C is fixed at a predetermined position. ing.
[0018]
An extraction blocking body 22 is fitted into the fitting hole 21 b of the fixing member main body 21 and is closed by a lid body 23 fitted to the inner end opening of the fixing member main body 21. An opening 22a having a vertically long rectangular shape for inserting the locking projection 13c of the shaft body 13 is formed at the center of the extraction preventing body 22, and the opening 22a passes through the opening 22a on the back side of the extraction preventing body 22. A locking groove 22b serving as an extraction preventing portion that can engage with the locking projection 13c is cut out. Two guide pins 24 are formed on the outer surface side of the extraction preventing body 22 so as to correspond to the tapered portion 13d formed on the locking projection 13c. A pair of rotational direction regulating pins 25 are planted on the back side of the extraction preventing body 22 so as to be positioned in the vicinity of the locking groove 22b. The rotation protrusion 13c is rotated only in one direction by the rotation direction restricting pin 25. Between the lid body 23 and the extraction preventing body 22, a rotation allowable space S for the locking projection 13c is formed.
[0019]
The fixing member main body 21 and the lid body 23 are integrally formed of, for example, a hard synthetic resin material. Further, the extraction preventing body 22 is integrally formed of a metal material. The inner diameter of the insertion hole 21a of the fixing member main body 21 is slightly larger than the outer diameter of the shaft main body 13a, that is, substantially the same diameter, and the length of the locking projection 13c is substantially the same as the outer diameter of the shaft main body 13a. Is formed.
[0020]
Next, the operation | movement is demonstrated about the lifting tool of the concrete product C comprised as mentioned above.
FIG. 1 shows a state in which the fixing member 11 is embedded in a predetermined position of the concrete product C, and the suspension member 12 including the shaft body 13 and the ring body 14 is detached from the fixing member 11 of the concrete product C. In this state, the ring body 14 is biased toward the distal end side of the shaft body 13 a by the coil spring 15, and the inner wall of the right ring portion 14 b of the ring body 14 is pressed by the stop ring 16.
[0021]
In this state, when the shaft body 13a of the shaft body 13 is inserted into the insertion hole 21a of the fixing member 11, the locking projection 13c passes through the opening 22a of the extraction preventing body 22 as shown in FIG. Enter the space S. During this insertion operation, when the locking projection 13c does not correspond to the opening 22a of the extraction preventing body 22, the tapered portion 13d contacts the guide pin 24 and the locking projection 13c corresponds to the opening 22a. The locking projection 13c smoothly passes through the opening 22a.
[0022]
As shown in FIG. 2, in a state where the locking projection 13 c has moved to the rotation allowable space S, the left ring portion 14 a of the ring body 14 is pressed against the surface of the concrete product C, and the coil spring 15 is moved by the stop ring 16. It is pushed to the left and stored. Then, when the knob 13f is rotated to rotate the shaft body 13a and the locking projection 13c in one direction, that is, approximately 90 degrees in the direction opposite to the rotation direction regulating pin 25, the locking is performed as shown by a chain line in FIG. The protrusion 13c is rotated to a position corresponding to the locking groove 22b. Further, when the knob 13f is stopped and released from the shaft 13, the both ends of the locking projection 13c engage with the locking groove 22b as shown by the solid line in FIG. Is done. Even in this state, the left ring portion 14 a of the ring body 14 is pressed against the surface of the concrete product C by the coil spring 15, and the shaft body 13 is urged outward by the coil spring 15.
[0023]
In this state, when the suspension hook 18 is lifted by a crane or the like, the concrete product C is lifted. The shaft body 13 is removed by a procedure reverse to the insertion and locking operations described above.
[0024]
Next, the effect is listed with a structure about the lifting tool of the concrete product C comprised as mentioned above.
(1) In the embodiment, the reduced diameter portion 13b is provided at the distal end portion of the shaft body 13a, and the locking projection 13c having a length shorter than the outer diameter of the shaft body 13a is provided at the distal end portion of the reduced diameter portion 13b. The locking protrusion 13c is configured to pass through the opening 22a of the extraction preventing body 22 and engage with the locking groove 22b. For this reason, it is only necessary to form the insertion hole 21a of the fixing member main body 21 in a cylindrical shape. The outer diameter can be reduced and the size can be reduced, and the structure can be simplified and the manufacturing can be easily performed.
[0025]
(2) In the embodiment, since the insertion hole 21a is formed in a cylindrical shape, when the fixing member main body 21 is embedded in the concrete product C, a columnar mounting bracket (not shown) is provided in the insertion hole 21a. It is possible to insert the shaft main body 13a into the insertion hole 21a smoothly.
[0026]
(3) In the above embodiment, since the inner diameter of the insertion hole 21a of the fixing member main body 21 and the outer diameter of the shaft main body 13a are substantially the same, when the concrete product C is lifted, the outer peripheral surface of the shaft main body 13a is inserted into the insertion hole 21a. The lifting force can be transmitted by contacting the inner peripheral surface of the fixing member in a wide area, and damage to the fixing member main body 21 can be suppressed.
[0027]
(4) In the above embodiment, since the fixing member main body 21 and the extraction preventing body 22 are separately formed, only the extraction prevention body 22 that is most required to be strong is made of a metal material to ensure the lifting force. I can take it.
[0028]
(5) In the above embodiment, the guide pin 24 is provided on the outer surface side of the extraction preventing body 22, and the tapered portion 13 d is formed on the locking protrusion 13 c of the shaft body 13. The opening 22a can be guided and moved quickly.
[0029]
(6) In the above embodiment, since the rotation direction regulating pin 25 is provided on the back side of the extraction preventing body 22, the locking protrusion 13c can be turned into the locking groove 22b only by rotating the shaft body 13 in one direction. It can move and engage quickly.
[0030]
(7) In the above-described embodiment, the ring body 14 is urged by the coil spring 15 in the direction of pressing the outer surface of the concrete product C. Therefore, when the ring body 14 is lifted by the hanging hook 18, the force is applied to the shortest of the concrete product C. Therefore, the bending moment of the shaft body 13a due to the lifting load can be reduced.
[0031]
  Next, the lifting tool of the present inventionOne embodimentWill be described with reference to FIGS.
  In FIG. 5 to FIG. 8, when the concrete product C is, for example, a lid concrete product C that shields the upper part of a U-shaped gutter concrete product, the concrete product C penetrates the lid concrete product C in the vertical direction. The fixing member 11 is embedded. As shown in FIG. 6, the lid body 23 includes a cylindrical main body 23a, a flange portion 23b integrally formed on the outer periphery thereof, and a bottom plate 23c integrally formed on the lower end portion of the main body 23a. Is formed with an annular separation groove 23d for forming a drainage passage in the lid body 23 itself.
[0032]
A synthetic resin cap 31 is fitted into the upper end opening of the fixing member main body 21. The cap 31 includes a cylindrical main body 31a that is fitted into the insertion hole 21a, a flange portion 31b that is integrally formed on the outer periphery of the upper end of the cap 31 and is engaged with the upper end edge of the fixing member main body 21, and an inner periphery of the flange portion 31b. And a drain passage 31c integrally formed in a grid pattern.
[0033]
The fixing member main body 21 is inserted into the insertion hole 21b through both ends of the extraction preventing plate 221 and the opening 22a of the position restricting member 222, so that the extraction preventing plate 221 and the position restricting member 222 are rotated. A pair of rotation restricting pieces 21j for restricting is integrally formed.
[0034]
  As shown in FIG. 5, a step portion 13k is formed at the intermediate portion of the shaft body 13a of the shaft body 13, and a male screw portion 13m is formed at the upper end portion of the small-diameter portion 13l above it.
The male screw portion 13m is screwed into a female screw portion 14d formed in the ring body 14A.
A washer 32 is loosely fitted to the small diameter portion 13l, and a coil spring 15 is interposed between the washer 32 and the ring body 14A. A bolt 33 is screwed into the ring body 14A and the male screw portion 13m in a direction perpendicular to the axis of the small diameter portion 13l, and the male screw portion 13m and the ring body 14A are connected.This lifting tool corresponds to the opening 22a of the extraction preventing body 22 within the range where the reduced diameter portion 13b is formed with respect to the fixing member main body 21, and the flat cylindrical portion 21e extends so as to extend the opening 22a. Is provided. That is, the passage cross-sectional shape of the flat cylindrical portion 21e is also formed in a rectangular shape in the same way as the opening 22a having a rectangular passage shape. A tapered cylinder portion 21f for guiding the locking projection 13c from the insertion hole 21a to the flat cylinder portion 21e is provided on the upper portion of the flat cylinder portion 21e.
[0035]
The suspension member 12 of the lifting tool configured as described above is inserted into the fixing member 11 in substantially the same manner as described above. This will be described briefly. Although not shown, the shaft body 13 of the suspension member 12 is inserted into the insertion hole 21a of the fixing member main body 21, and the locking projection 13c is lowered from the opening 22a against the urging force of the coil spring 15. Move to. Thereafter, when the ring body 14A is rotated 45 degrees and released, the locking projection 13c is locked to the locking groove 22b as shown in FIG. This locked state is stably held by the washer 32 and the coil spring 15. The detachment operation of the suspension member 12 is performed by a procedure reverse to the insertion method described above.
[0036]
  Immediately before the lid concrete product C is installed in the U-shaped groove, the bottom plate 23c is separated from the groove 23d to form a drainage passage. After the product is installed, the cap 31 is fitted to the upper end of the insertion hole 21a of the fixing member main body 21 as shown in FIG. For this reason, the entire fixing member 11 is vertically penetrated, and the fixing member 11 functions as a drain hole. Accordingly, as shown by the chain line in FIG. 8, the water drainage recess conventionally formed on the edge of the lid concrete product C can be omitted.
In this embodiment, since a part of the concrete product C enters the pair of left and right recesses 21g formed by the flat cylindrical portion 21e, the bottom wall portion of the pull-out preventing plate 221 and the recess 21g from the locking projection 13c. The lifting force is transmitted to the concrete product C through 21h. For this reason, it is not necessary to form the detachment preventing protrusion 21c on the outer peripheral surface of the fixing member main body 21, and the outer diameter of the fixing member main body 21 can be shortened to reduce the size. Furthermore, the mold of the fixing member main body 21 can be simplified to easily manufacture it. Furthermore, in this embodiment, since the taper cylinder part 21f is provided on the upper part of the flat cylinder part 21e, the operation | work which introduces the latching protrusion 13c from the insertion hole 21a to the opening 22a can be performed smoothly.
[0037]
  Next, the aboveImplementationAnother example of the form will be sequentially described with reference to FIGS.
  In another example shown in FIG. 9, the locking protrusion 13c is formed only on one side of the tip of the reduced diameter portion 13b. In this alternative, material costs can be saved.
[0038]
In another example shown in FIG. 10A, the shape of the locking projection 13c of the shaft body 13 is a square shape. Alternatively, it may be formed in a triangular shape as shown in FIG.
* Another example shown in FIG.11 and FIG.12 is a thing of a vertical suspension system. This lifting tool corresponds to the opening 22a of the extraction preventing body 22 within the range where the reduced diameter portion 13b is formed with respect to the fixing member main body 21, and the flat cylindrical portion 21e extends so as to extend the opening 22a. Is provided. That is, the passage cross-sectional shape of the flat cylindrical portion 21e is also formed in a rectangular shape in the same way as the opening 22a having a rectangular passage shape. A tapered cylinder portion 21f for guiding the locking projection 13c from the insertion hole 21a to the flat cylinder portion 21e is provided on the upper portion of the flat cylinder portion 21e.
[0039]
The extraction prevention body 22 is fitted and bonded to the inner top portion of the insertion hole 21b, and is bonded to a metal or hard synthetic resin extraction prevention plate 221 having an opening 22a, and to the lower surface of the extraction prevention plate 221. And a position restricting member 222 having an opening 22a and a locking groove 22b. A screw hole 13h is formed at the upper end of the shaft body 13a of the shaft body 13, and a bolt 26 welded to the ring body 14A is screwed together.
[0040]
  In the other example described above, a part of the concrete product C enters the pair of left and right recesses 21g formed by the flat cylindrical part 21e, so that the extraction preventing plate 221 and the bottom wall part 21h of the recess 21g from the locking protrusions 13c. The lifting force is transmitted to the concrete product C via For this reason, it is not necessary to form the detachment preventing protrusion 21c on the outer peripheral surface of the fixing member main body 21, and the outer diameter of the fixing member main body 21 can be shortened to reduce the size. In addition, the mold of the fixing member main body 21 can be simplified and the manufacture thereof can be easily performed. Furthermore, in the other example described above, since the tapered cylindrical portion 21f is provided on the upper portion of the flat cylindrical portion 21e, the operation of introducing the locking projection 13c from the insertion hole 21a into the opening 22a can be performed smoothly.
[0041]
In another example shown in FIG. 13, a triangular plate-shaped reinforcing rib 13 i is integrally formed at the boundary portion between the lower end portion of the shaft body 13 a and the upper end portion of the reduced diameter portion 13 b of the shaft body 13. In this other example, the connection strength between the shaft main body 13a and the reduced diameter portion 13b can be improved.
[0042]
In the other example shown in FIG. 13, the contact surface that transmits the lifting force of the upper surface 13j of the locking projection 13c, the extraction preventing plate 221 and the bottom wall portion 21h of the recess 21g is formed on an inclined surface that is lowered downward. May be. In this case, as shown by the arrow, the lifting force by the locking projection 13c is transmitted obliquely outward and upward, so that the concrete product C that has entered the recess 21g is efficiently pressed over a wide area, and the lifting force sharing ability is improved. can do.
[0043]
In another example shown in FIG. 14, a step portion 21 i is formed at the upper end portion of the fixing member main body 21 so that the coil spring 15 is accommodated. In this alternative example, since the coil spring 15 is disposed outside, it can be easily determined whether or not the suspension member 12 is properly locked to the fixing member 11.
[0044]
Although not shown, the fixing member 11 may be configured by insert-molding the extraction preventing body 22 into the fixing member main body 21.
Although not shown, a protrusion may be formed instead of the locking groove 22b of the extraction preventing body 22, and a locking recess for locking the protrusion may be provided on the locking protrusion 13c side.
[0045]
As a material for the fixing member, polypropylene resin or 6.6 nylon containing 30% glass fiber may be used. For example, a high-strength synthetic resin in which 30% glass fiber is contained in 6.6 nylon can be used as the material of the extraction preventing body 22, and a hard synthetic resin such as polypropylene resin can be used as the material of the fixing member main body 21.
[0046]
  Next, technical ideas other than the claims grasped from the embodiment will be described below..
[0047]
  (Technical thought1) The shaft member (13) of the suspension member (12) comprising the shaft body (13) and the ring body (14A) is embedded in the fixing position of the concrete product (C) by penetrating the fixing member (11) vertically. In the concrete product for vertical suspension constituted so that the suspension member (12) is engaged with the concrete product by inserting it into the insertion hole (21a) of the fixing member (11) and rotating it.
  The outer diameter of the shaft main body (13a) of the suspension member (12) is made substantially the same as the inner diameter of the insertion hole (21a) of the fixing member (11), and the reduced diameter portion (13b) is formed at the tip of the shaft main body (13a). A locking projection (13c) having a dimension shorter than the inner diameter of the insertion hole (21a) and longer than the reduced diameter portion (13b) is provided through the fixing hole (21), and the locking projection ( 13c) is provided with an extraction prevention body (22) having an opening (22a) into which the insertion prevention body (22a) can be inserted, and is arranged around the axis of the shaft body (13) from the opening (22a) to the back surface of the extraction prevention body (22). An extraction preventing portion (22b) for preventing the locking protrusion (13c) rotated by an angle from being pulled out is provided, and the insertion hole (21b) formed on the inner end side of the fixing member main body (21) has a lid. The lid (23) is drained through the lid itself. An annular separation groove (23d) for forming a slab or a breakable thin wall portion is formed, and an insertion hole (21a) formed on the upper end side of the fixing member main body (21) has a drainage passage after the installation of the concrete product. A vertically suspended concrete product configured to fit a cap (31) having (31c).
[0048]
Since this vertical hanging concrete product can function the fixing member (11) used for lifting the product as a drainage passage in the state of use, it is not necessary to form a dedicated drainage passage and can be easily manufactured. It can be carried out.
[0049]
【The invention's effect】
According to the first aspect of the present invention, the structure of the fixing member main body can be simplified and the size can be reduced, and the washer and the coil spring can be prevented from coming off from the intermediate portion of the shaft main body, and the suspension member to the fixing member can be prevented. Can be easily detached.
[0050]
  Claim1In the described invention, since the flat cylindrical portion is provided so as to correspond to the opening in the formation range of the reduced diameter portion with respect to the fixing member main body, a concave portion is formed in the fixing member main body corresponding to the flat cylindrical portion, Since the concrete enters the recess, it is not necessary to form a detachment preventing protrusion on the outer periphery of the fixing member main body. Therefore, the fixing member main body can be easily molded and the material cost can be reduced. it can.
[0051]
  Claim3In the described invention, since the tapered cylindrical portion that guides the locking projection from the insertion hole to the flat cylindrical portion is provided on the upper portion of the flat cylindrical portion, the insertion operation of the locking projection can be easily performed.
The invention according to claim 4 can increase the lifting force of the concrete product C.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a concrete product lifting tool embodying the present invention.
FIG. 2 is a cross-sectional view illustrating a state where a shaft body is inserted into a fixing member.
FIG. 3 is a cross-sectional view showing a state where a locking protrusion of a shaft body is engaged with a fixing member.
FIG. 4 is an exploded perspective view illustrating a shaft body of a fixing member and a suspension member.
FIG. 5 is a cross-sectional view of the present invention embodied in a vertically suspended structure.
6 is an exploded perspective view of the fixing member of FIG.
7 is a longitudinal sectional view of the fixing member of FIG.
8 is a perspective view of a concrete product using the fixing member of FIG.
FIG. 9 is a perspective view showing another example of the locking protrusion of the shaft body.
FIGS. 10A and 10B are front views showing another example of the opening and the locking protrusion. FIGS.
FIG. 11 is a cross-sectional view in which the lifting tool is embodied in a vertically suspended structure.
12 is an exploded perspective view of the lifting tool of FIG. 11. FIG.
FIG. 13 is a partially broken front view in which the lifting tool is embodied in a vertically suspended structure.
FIG. 14 is a cross-sectional view in which the lifting tool is embodied in a vertically suspended structure.
FIG. 15 is a sectional view showing a conventional lifting tool separately.
[Explanation of symbols]
  DESCRIPTION OF SYMBOLS 11 ... Fixing member, 12 ... Suspension member, 13 ... Shaft body, 13a ... Shaft body, 13b ... Reduced diameter part, 13c ... Locking protrusion, 13e ... Locking flange, 14A ... Ring, 15 ... Coil spring, 21 ... Fixing Member main body, 21a ... insertion hole, 21b ... insertion hole,21e ... flat tube portion, 21f ... tapered tube portion, 21g ... concave portion, 21h ... bottom wall portion22 ... an extraction preventing body, 22a ... an opening, 22b ... a locking groove as an extraction preventing portion, 23 ... a lid, 25 ... a rotation direction restricting pin as a rotation restricting portion.

Claims

The fixing member (11) is embedded in the hanging position of the concrete product (C), and the shaft body (13) of the hanging member (12) composed of the shaft body (13) and the ring body (14, 14A) is used as the fixing member ( 11) In a concrete product lifting tool configured to engage the suspension member (12) with the concrete product by inserting and rotating the insertion hole (21a) in 11),
The fixing member (11) includes a fixing member main body (21) having an insertion hole (21a), and an extraction preventing body (21b) inserted into an insertion hole (21b) formed on the inner end side of the fixing member main body (21). 22) and a lid (23) for closing the inner end opening of the fixing member main body (21), and the outer diameter of the shaft main body (13a) of the suspension member (12) is set to the fixing member (11). The inner diameter of the insertion hole (21a) is substantially the same as the inner diameter of the insertion hole (21a) and is shorter than the inner diameter of the insertion hole (21a) via the reduced diameter part (13b) at the tip of the shaft body (13a). long dimension locking projections to (13c) provided in, provided the extraction blocking member (22) to an opening capable of inserting the locking projection in the vicinity of the inner end of the fixing member (11) (13c) (22a), A shaft body (13) from the opening (22a) with respect to the back surface of the extraction preventing body (22). ) Is provided with an extraction preventing portion (22b) for preventing the locking protrusion (13c) rotated about a predetermined angle around the axis of the fixing member main body (21). 13b), a flat cylindrical portion (21e) is provided so as to extend the opening corresponding to the opening (22a), and an annular ring body is provided at the base end of the shaft body (13a). (14A) is connected as a separate member, a stepped portion (13k) is formed in the middle portion of the shaft body (13a), and a small diameter portion (13l) is formed between the stepped portion (13k) and the ring body (14A). ) And a coil spring (15) is interposed between the washer (32) and the ring body (14A) locked to the stepped portion (13k). Upper tool.

The male screw portion (13m) is formed on the upper end portion of the small diameter portion (13l) above the step portion (13k) according to claim 1, and the male screw portion (13m) is formed on the ring body (14A). The bolt (33) is screwed into the ring body (14A) and the male screw portion (13m) in a direction perpendicular to the axis of the small diameter portion (13l). A lifting tool for a concrete product in which the portion (13m) and the ring body (14A) are connected.

In Claim 1, the taper cylinder part (21f) which guides the said latching protrusion (13c) from the said insertion hole (21a) in a flat cylinder part (21e) is provided in the upper part of the said flat cylinder part (21e). A lifting tool for concrete products.

The fixing member main body according to claim 1, wherein the locking groove (22b) of the extraction preventing body (22) is provided corresponding to the concave portion (21g) formed on both sides of the flat tube portion (21e). The lifting force transmission surface of the bottom wall portion (21h) of the insertion hole (21b), the locking projection (13c) and the locking groove (22b) of (21) is an inclined surface that is inclined downward toward the outer side. Product lifting tool.