{"id":15941,"date":"2026-08-17T02:02:59","date_gmt":"2026-08-17T02:02:59","guid":{"rendered":"https:\/\/www.hndfcrane.com\/?post_type=posts&#038;p=15941"},"modified":"2026-08-17T02:03:02","modified_gmt":"2026-08-17T02:03:02","slug":"overhead-crane-girder-web-crack-analysis","status":"publish","type":"posts","link":"https:\/\/www.hndfcrane.com\/ja\/posts\/overhead-crane-girder-web-crack-analysis\/","title":{"rendered":"\u5929\u4e95\u30af\u30ec\u30fc\u30f3\u306e\u6841\u30a6\u30a7\u30d6\u306e\u4e80\u88c2\u89e3\u6790\uff1a\u539f\u56e0\u3068\u5bfe\u7b56"},"content":{"rendered":"<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><p>\u76ee\u6b21<\/p><nav><ul><li><a href=\"#1-root-causes-of-overhead-crane-girder-web-cracking\">1. \u5929\u4e95\u30af\u30ec\u30fc\u30f3\u306e\u6841\u30a6\u30a7\u30d6\u4e80\u88c2\u306e\u6839\u672c\u539f\u56e0<\/a><ul><li><a href=\"#1-1-stress-concentration\">1.1 \u30b9\u30c8\u30ec\u30b9\u96c6\u4e2d<\/a><\/li><li><a href=\"#1-2-welding-quality\">1.2 \u6eb6\u63a5\u54c1\u8cea<\/a><\/li><li><a href=\"#1-3-material-defects\">1.3 \u6750\u6599\u306e\u6b20\u9665<\/a><\/li><li><a href=\"#1-4-fatigue-loading\">1.4 \u75b2\u52b4\u8377\u91cd<\/a><\/li><li><a href=\"#1-5-design-deficiencies\">1.5 \u8a2d\u8a08\u4e0a\u306e\u6b20\u9665<\/a><\/li><li><a href=\"#1-6-overloading-and-improper-use\">1.6 \u904e\u8ca0\u8377\u304a\u3088\u3073\u4e0d\u9069\u5207\u306a\u4f7f\u7528<\/a><\/li><li><a href=\"#1-7-vibration-and-impact\">1.7 \u632f\u52d5\u3068\u885d\u6483<\/a><\/li><\/ul><\/li><li><a href=\"#2-solutions-for-overhead-crane-girder-web-cracking\">2. \u5929\u4e95\u30af\u30ec\u30fc\u30f3\u306e\u6841\u30a6\u30a7\u30d6\u306e\u4e80\u88c2\u306b\u5bfe\u3059\u308b\u89e3\u6c7a\u7b56<\/a><ul><li><a href=\"#2-1-improve-structural-design\">2.1 \u69cb\u9020\u8a2d\u8a08\u306e\u6539\u5584<\/a><\/li><li><a href=\"#2-2-improve-welding-quality\">2.2 \u6eb6\u63a5\u54c1\u8cea\u306e\u5411\u4e0a<\/a><\/li><li><a href=\"#2-3-ensure-material-quality\">2.3 \u6750\u6599\u306e\u54c1\u8cea\u3092\u78ba\u4fdd\u3059\u308b<\/a><\/li><li><a href=\"#2-4-operate-equipment-properly\">2.4 \u6a5f\u5668\u306e\u9069\u5207\u306a\u64cd\u4f5c<\/a><\/li><li><a href=\"#2-5-perform-regular-maintenance-and-inspection\">2.5 \u5b9a\u671f\u7684\u306a\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3068\u70b9\u691c\u3092\u5b9f\u65bd\u3059\u308b<\/a><\/li><\/ul><\/li><li><a href=\"#conclusion\">\u7d50\u8ad6<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<p>\u5929\u4e95\u30af\u30ec\u30fc\u30f3\u306e\u4e3b\u6841\u7aef\u90e8\u306b\u304a\u3051\u308b\u65ad\u9762\u5909\u5316\u90e8\u3067\u306e\u30a6\u30a7\u30d6\u4e80\u88c2\u306f\u3001\u9577\u671f\u4f7f\u7528\u306b\u304a\u3044\u3066\u3088\u304f\u767a\u751f\u3059\u308b\u6df1\u523b\u306a\u554f\u984c\u3067\u3059\u3002\u4e80\u88c2\u767a\u751f\u306e\u539f\u56e0\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u4e88\u9632\u3068\u89e3\u6c7a\u306e\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u4ee5\u4e0b\u3067\u306f\u3001\u5929\u4e95\u30af\u30ec\u30fc\u30f3\u306e\u4e3b\u6841\u7aef\u90e8\u306b\u304a\u3051\u308b\u65ad\u9762\u5909\u5316\u90e8\u3067\u306e\u30a6\u30a7\u30d6\u4e80\u88c2\u306e\u539f\u56e0\u306b\u3064\u3044\u3066\u5206\u6790\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2422\" height=\"1614\" src=\"https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Main-girder-end-web-crack.png\" alt=\"\" class=\"wp-image-15933\" srcset=\"https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Main-girder-end-web-crack.png 2422w, https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Main-girder-end-web-crack-1536x1024.png 1536w, https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Main-girder-end-web-crack-2048x1365.png 2048w\" sizes=\"(max-width: 2422px) 100vw, 2422px\" \/><figcaption class=\"wp-element-caption\">\u4e3b\u6841\u7aef\u90e8\u30a6\u30a7\u30d6\u306e\u4e80\u88c2\uff1a\u4e80\u88c2\u306f\u3001\u4e3b\u6841\u3068\u7aef\u90e8\u67b6\u53f0\u8eca\u304c\u63a5\u7d9a\u3059\u308b\u53ef\u5909\u65ad\u9762\u306e\u89d2\u90e8\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"1-root-causes-of-overhead-crane-girder-web-cracking\">1. \u5929\u4e95\u30af\u30ec\u30fc\u30f3\u306e\u6841\u30a6\u30a7\u30d6\u4e80\u88c2\u306e\u6839\u672c\u539f\u56e0<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-1-stress-concentration\">1.1 \u30b9\u30c8\u30ec\u30b9\u96c6\u4e2d<\/h3>\n\n\n\n<p>\u5bf8\u6cd5\u8981\u4ef6\u3092\u6e80\u305f\u3059\u3068\u3068\u3082\u306b\u3001\u69d8\u3005\u306a\u4f7f\u7528\u6761\u4ef6\u4e0b\u3067\u306e\u5f37\u5ea6\u3068\u525b\u6027\u306e\u8981\u6c42\u3092\u6e80\u305f\u3059\u305f\u3081\u3001\u4e3b\u6841\u306e\u7aef\u90e8\u306f\u3057\u3070\u3057\u3070\u65ad\u9762\u5f62\u72b6\u304c\u5909\u5316\u3059\u308b\u3088\u3046\u306b\u8a2d\u8a08\u3055\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u65ad\u9762\u5f62\u72b6\u306e\u5909\u5316\u306b\u4f34\u3046\u5e7e\u4f55\u5b66\u7684\u5f62\u72b6\u306e\u4e0d\u9023\u7d9a\u6027\u306b\u3088\u308a\u5fdc\u529b\u96c6\u4e2d\u304c\u751f\u3058\u3001\u65ad\u9762\u5f62\u72b6\u304c\u5909\u5316\u3059\u308b\u90e8\u5206\u306e\u5fdc\u529b\u306f\u4ed6\u306e\u90e8\u5206\u3088\u308a\u3082\u8457\u3057\u304f\u9ad8\u304f\u306a\u308a\u307e\u3059\u3002\u5fdc\u529b\u96c6\u4e2d\u90e8\u306f\u4e80\u88c2\u306e\u767a\u751f\u3068\u4f1d\u64ad\u3092\u8d77\u3053\u3057\u3084\u3059\u3044\u7b87\u6240\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u5929\u4e95\u30af\u30ec\u30fc\u30f3\u306e\u529b\u5b66\u7684\u89e3\u6790\u3067\u306f\u3001\u7b49\u4fa1\u5fdc\u529b\u5206\u5e03\u306b\u304a\u3044\u3066\u65ad\u9762\u5f62\u72b6\u304c\u5909\u5316\u3059\u308b\u90e8\u5206\u306e\u5fdc\u529b\u304c\u4ed6\u306e\u90e8\u5206\u3088\u308a\u3082\u8457\u3057\u304f\u9ad8\u3044\u3053\u3068\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1035\" height=\"690\" src=\"https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Equivalent-stress-contour-of-an-overhead-crane.png\" alt=\"\" class=\"wp-image-15938\"\/><\/figure>\n\n\n\n<p>\u4e0a\u8a18\u3067\u5206\u6790\u3057\u305f\u88fd\u54c1\u306f\u3001\u65ad\u9762\u5f62\u72b6\u304c\u5909\u5316\u3059\u308b\u90e8\u5206\u306b\u50be\u659c\u3057\u305f\u9077\u79fb\u90e8\u3092\u5099\u3048\u3066\u3044\u308b\u306e\u306b\u5bfe\u3057\u3001\u672c\u4e8b\u4f8b\u306e\u69cb\u9020\u306f\u76f4\u89d2\u306e\u9077\u79fb\u90e8\u3092\u63a1\u7528\u3057\u3066\u304a\u308a\u3001\u3088\u308a\u6df1\u523b\u306a\u5fdc\u529b\u96c6\u4e2d\u72b6\u614b\u3092\u751f\u307f\u51fa\u3057\u3066\u3044\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-2-welding-quality\">1.2 \u6eb6\u63a5\u54c1\u8cea<\/h3>\n\n\n\n<p>\u6eb6\u63a5\u54c1\u8cea\u306f\u3001\u69cb\u9020\u7269\u306e\u5b89\u5168\u6027\u3068\u8010\u7528\u5e74\u6570\u306b\u76f4\u63a5\u5f71\u97ff\u3057\u307e\u3059\u3002\u4e0d\u9069\u5207\u306a\u6eb6\u63a5\u4f5c\u696d\u306f\u3001\u6c17\u5b54\u3001\u30b9\u30e9\u30b0\u6df7\u5165\u3001\u6eb6\u3051\u8fbc\u307f\u4e0d\u8db3\u3001\u6eb6\u63a5\u5272\u308c\u306a\u3069\u306e\u6b20\u9665\u3092\u5bb9\u6613\u306b\u767a\u751f\u3055\u305b\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u6b20\u9665\u306f\u5fdc\u529b\u96c6\u4e2d\u70b9\u3068\u306a\u308a\u3001\u5916\u90e8\u8377\u91cd\u4e0b\u3067\u5bb9\u6613\u306b\u4e80\u88c2\u767a\u751f\u7b87\u6240\u3068\u306a\u308a\u307e\u3059\u3002\u6eb6\u63a5\u5f62\u72b6\u304c\u8907\u96d1\u306a\u305f\u3081\u3001\u65ad\u9762\u5f62\u72b6\u304c\u5909\u5316\u3059\u308b\u7b87\u6240\u3067\u306f\u6eb6\u63a5\u54c1\u8cea\u306e\u554f\u984c\u304c\u767a\u751f\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u65ad\u9762\u5f62\u72b6\u304c\u5909\u5316\u3059\u308b\u6eb6\u63a5\u90e8\u306e\u76f4\u89d2\u30b3\u30fc\u30ca\u30fc\u3067\u306f\u3001\u6eb6\u63a5\u54c1\u8cea\u3092\u4fdd\u8a3c\u3059\u308b\u3053\u3068\u304c\u56f0\u96e3\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-3-material-defects\">1.3 \u6750\u6599\u306e\u6b20\u9665<\/h3>\n\n\n\n<p>\u92fc\u6750\u306b\u306f\u3001\u88fd\u9020\u5de5\u7a0b\u4e0a\u306e\u554f\u984c\u306b\u3088\u308a\u3001\u975e\u91d1\u5c5e\u4ecb\u5728\u7269\u3001\u6c17\u5b54\u3001\u5fae\u7d30\u4e80\u88c2\u306a\u3069\u306e\u5185\u90e8\u6b20\u9665\u304c\u5b58\u5728\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u6b20\u9665\u306f\u5fdc\u529b\u4e0b\u3067\u4f1d\u64ad\u3057\u3001\u76ee\u306b\u898b\u3048\u308b\u4e80\u88c2\u3078\u3068\u767a\u5c55\u3059\u308b\u50be\u5411\u304c\u3042\u308a\u307e\u3059\u3002\u3055\u3089\u306b\u3001\u7570\u306a\u308b\u30d0\u30c3\u30c1\u9593\u3067\u6750\u6599\u7279\u6027\u306b\u3070\u3089\u3064\u304d\u304c\u3042\u308b\u3068\u3001\u5c40\u6240\u7684\u306a\u5fdc\u529b\u96c6\u4e2d\u304c\u751f\u3058\u3001\u4e80\u88c2\u306e\u767a\u751f\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u672c\u4ef6\u3067\u306f\u6750\u6599\u60c5\u5831\u304c\u5165\u624b\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u6750\u6599\u6b20\u9665\u304c\u539f\u56e0\u306e\u4e00\u3064\u3067\u3042\u308b\u53ef\u80fd\u6027\u3092\u6392\u9664\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-4-fatigue-loading\">1.4 \u75b2\u52b4\u8377\u91cd<\/h3>\n\n\n\n<p>\u5929\u4e95\u30af\u30ec\u30fc\u30f3\u306f\u3001\u904b\u8ee2\u4e2d\u306b\u7e70\u308a\u8fd4\u3057\u52d5\u7684\u306a\u8377\u91cd\u3092\u53d7\u3051\u308b\u3053\u3068\u304c\u983b\u7e41\u306b\u3042\u308a\u307e\u3059\u3002\u4e3b\u6841\u306e\u65ad\u9762\u5f62\u72b6\u306f\u5909\u5316\u3057\u3084\u3059\u304f\u3001\u7279\u306b\u8377\u91cd\u3092\u540a\u308a\u4e0a\u3052\u308b\u969b\u306b\u306f\u3001\u5fdc\u529b\u304c\u5468\u671f\u7684\u306b\u5909\u52d5\u3057\u307e\u3059\u3002\u3053\u306e\u7e70\u308a\u8fd4\u3057\u306e\u5fdc\u529b\u30b5\u30a4\u30af\u30eb\u306b\u3088\u308a\u3001\u6750\u6599\u306e\u75b2\u52b4\u7834\u58ca\u304c\u751f\u3058\u307e\u3059\u3002\u5fdc\u529b\u30ec\u30d9\u30eb\u304c\u6750\u6599\u306e\u964d\u4f0f\u5f37\u5ea6\u3092\u4e0b\u56de\u3063\u3066\u3044\u3066\u3082\u3001\u9577\u671f\u9593\u306e\u4f7f\u7528\u5f8c\u306b\u306f\u75b2\u52b4\u4e80\u88c2\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u65ad\u9762\u5f62\u72b6\u304c\u5909\u5316\u3059\u308b\u90e8\u5206\u306f\u3001\u5fdc\u529b\u96c6\u4e2d\u3068\u6750\u6599\u75b2\u52b4\u306e\u8907\u5408\u7684\u306a\u5f71\u97ff\u306b\u3088\u308a\u3001\u4e80\u88c2\u304c\u767a\u751f\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-5-design-deficiencies\">1.5 \u8a2d\u8a08\u4e0a\u306e\u6b20\u9665<\/h3>\n\n\n\n<p>\u3072\u3073\u5272\u308c\u306e\u30ea\u30b9\u30af\u3092\u9ad8\u3081\u308b\u8a2d\u8a08\u8981\u56e0\u3068\u3057\u3066\u306f\u3001\u6ed1\u3089\u304b\u306a\u8f2a\u90ed\u306e\u306a\u3044\u6025\u6fc0\u306a\u65ad\u9762\u5909\u5316\u3001\u5fdc\u529b\u96c6\u4e2d\u52b9\u679c\u306e\u9069\u5207\u306a\u8003\u616e\u4e0d\u8db3\u3001\u75b2\u52b4\u8a2d\u8a08\u4e0a\u306e\u8003\u616e\u4e8b\u9805\u306e\u7121\u8996\u306a\u3069\u304c\u6319\u3052\u3089\u308c\u308b\u3002\u8a2d\u8a08\u6bb5\u968e\u3067\u65ad\u9762\u5f62\u72b6\u304c\u5909\u5316\u3059\u308b\u7b87\u6240\u306b\u88dc\u5f37\u6750\u3092\u914d\u7f6e\u3057\u306a\u3044\u3053\u3068\u3082\u3001\u9577\u671f\u4f7f\u7528\u306b\u304a\u3051\u308b\u3072\u3073\u5272\u308c\u306e\u539f\u56e0\u3068\u306a\u308b\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u9069\u5207\u306a\u8a2d\u8a08\u306f\u3072\u3073\u5272\u308c\u306e\u767a\u751f\u3092\u6291\u5236\u3059\u308b\u4e0a\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3059\u3002 <\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-6-overloading-and-improper-use\">1.6 \u904e\u8ca0\u8377\u304a\u3088\u3073\u4e0d\u9069\u5207\u306a\u4f7f\u7528<\/h3>\n\n\n\n<p>\u30af\u30ec\u30fc\u30f3\u306f\u9069\u7528\u898f\u683c\u306b\u57fa\u3065\u304d\u4e00\u5b9a\u306e\u5b89\u5168\u30de\u30fc\u30b8\u30f3\u3092\u8a2d\u3051\u3066\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u5b9f\u969b\u306b\u306f\u904e\u8ca0\u8377\u3084\u659c\u3081\u65b9\u5411\u3078\u306e\u727d\u5f15\u3001\u3042\u308b\u3044\u306f\u659c\u3081\u540a\u308a\u4e0a\u3052\u306f\u73cd\u3057\u304f\u3042\u308a\u307e\u305b\u3093\u3002\u983b\u7e41\u306a\u904e\u8ca0\u8377\u3084\u4e0d\u9069\u5207\u306a\u540a\u308a\u4e0a\u3052\u4f5c\u696d\u306f\u3001\u4e3b\u6841\u306b\u8a2d\u8a08\u5024\u3092\u8d85\u3048\u308b\u5fdc\u529b\u3092\u53ca\u307c\u3057\u3001\u5c40\u6240\u7684\u306a\u5fdc\u529b\u96c6\u4e2d\u3001\u6750\u6599\u75b2\u52b4\u306e\u52a0\u901f\u3001\u305d\u3057\u3066\u6700\u7d42\u7684\u306b\u306f\u4e80\u88c2\u306e\u767a\u751f\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002\u904e\u8ca0\u8377\u306f\u69cb\u9020\u5909\u5f62\u3082\u5f15\u304d\u8d77\u3053\u3057\u3001\u5fdc\u529b\u96c6\u4e2d\u3068\u4e80\u88c2\u306e\u4f1d\u64ad\u3092\u3055\u3089\u306b\u60aa\u5316\u3055\u305b\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-7-vibration-and-impact\">1.7 \u632f\u52d5\u3068\u885d\u6483<\/h3>\n\n\n\n<p>\u30af\u30ec\u30fc\u30f3\u306f\u904b\u8ee2\u4e2d\u306b\u5fc5\u7136\u7684\u306b\u632f\u52d5\u3084\u885d\u6483\u3092\u53d7\u3051\u307e\u3059\u3002\u30ec\u30fc\u30eb\u7d99\u304e\u76ee\u306e\u9699\u9593\u304c\u5927\u304d\u3059\u304e\u308b\u3068\u3001\u30af\u30ec\u30fc\u30f3\u304c\u7d99\u304e\u76ee\u3092\u901a\u904e\u3059\u308b\u969b\u306b\u5927\u304d\u306a\u885d\u6483\u8377\u91cd\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u9577\u671f\u306b\u308f\u305f\u308b\u632f\u52d5\u3068\u885d\u6483\u306f\u75b2\u52b4\u640d\u50b7\u3092\u5f15\u304d\u8d77\u3053\u3057\u3001\u5fae\u7d30\u306a\u4e80\u88c2\u306e\u4f1d\u64ad\u3092\u4fc3\u9032\u3057\u307e\u3059\u3002\u4e80\u88c2\u306f\u3001\u5fdc\u529b\u96c6\u4e2d\u304c\u65e2\u306b\u5b58\u5728\u3059\u308b\u65ad\u9762\u5f62\u72b6\u306e\u7570\u306a\u308b\u7b87\u6240\u3067\u767a\u751f\u3057\u3001\u4f1d\u64ad\u3059\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"2-solutions-for-overhead-crane-girder-web-cracking\">2. \u5929\u4e95\u30af\u30ec\u30fc\u30f3\u306e\u6841\u30a6\u30a7\u30d6\u306e\u4e80\u88c2\u306b\u5bfe\u3059\u308b\u89e3\u6c7a\u7b56<\/h2>\n\n\n\n<p>\u5929\u4e95\u30af\u30ec\u30fc\u30f3\u306e\u4e3b\u6841\u7aef\u90e8\u306e\u65ad\u9762\u304c\u5909\u5316\u3059\u308b\u90e8\u5206\u306b\u304a\u3051\u308b\u30a6\u30a7\u30d6\u306e\u3072\u3073\u5272\u308c\u3092\u9632\u6b62\u30fb\u8efd\u6e1b\u3059\u308b\u305f\u3081\u306b\u3001\u5305\u62ec\u7684\u306a\u5bfe\u7b56\u3092\u8b1b\u3058\u308b\u3079\u304d\u3067\u3042\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-1-improve-structural-design\">2.1 \u69cb\u9020\u8a2d\u8a08\u306e\u6539\u5584<\/h3>\n\n\n\n<p>\u5fdc\u529b\u96c6\u4e2d\u3092\u4f4e\u6e1b\u3059\u308b\u305f\u3081\u306b\u3001\u6ed1\u3089\u304b\u3067\u7de9\u3084\u304b\u306a\u5909\u5316\u3092\u7528\u3044\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u53ef\u5909\u65ad\u9762\u8a2d\u8a08\u3092\u6700\u9069\u5316\u3059\u308b\u3002\u9577\u671f\u75b2\u52b4\u306b\u95a2\u3059\u308b\u61f8\u5ff5\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u3001\u75b2\u52b4\u8a2d\u8a08\u3092\u53d6\u308a\u5165\u308c\u308b\u3002\u63a8\u5968\u3055\u308c\u308b\u88dc\u5f37\u5bfe\u7b56\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3042\u308b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1080\" height=\"720\" src=\"https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Adding-a-gusset-plate-at-the-connection-plate.png\" alt=\"\" class=\"wp-image-15947\"\/><\/figure>\n\n\n\n<p>\u4e0b\u56f3\u306b\u793a\u3059\u3088\u3046\u306b\u3001\u63a5\u5408\u90e8\u306b\u4e09\u89d2\u5f62\u306e\u30ac\u30bb\u30c3\u30c8\u30d7\u30ec\u30fc\u30c8\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3067\u3001\u5c40\u6240\u7684\u306a\u525b\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2496\" height=\"1664\" src=\"https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Reinforcement-plate-scheme.png\" alt=\"\" class=\"wp-image-15935\" srcset=\"https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Reinforcement-plate-scheme.png 2496w, https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Reinforcement-plate-scheme-1536x1024.png 1536w, https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Reinforcement-plate-scheme-2048x1365.png 2048w\" sizes=\"(max-width: 2496px) 100vw, 2496px\" \/><\/figure>\n\n\n\n<p>\u5225\u306e\u65b9\u6cd5\u3068\u3057\u3066\u306f\u3001\u4e0b\u56f3\u306b\u793a\u3059\u3088\u3046\u306b\u3001\u30d1\u30c3\u30c1\u306b\u3088\u308b\u88dc\u5f37\u3092\u884c\u3046\u65b9\u6cd5\u304c\u3042\u308b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2496\" height=\"1664\" src=\"https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Reinforcement-by-patching.png\" alt=\"\" class=\"wp-image-15936\" srcset=\"https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Reinforcement-by-patching.png 2496w, https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Reinforcement-by-patching-1536x1024.png 1536w, https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/08\/Reinforcement-by-patching-2048x1365.png 2048w\" sizes=\"(max-width: 2496px) 100vw, 2496px\" \/><\/figure>\n\n\n\n<p>\u3057\u304b\u3057\u3001\u5143\u306e\u69cb\u9020\u3067\u306f\u65e2\u306b\u30a6\u30a7\u30d6\u4e0b\u90e8\u306b\u88dc\u5f37\u677f\u304c\u8a2d\u3051\u3089\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u65b0\u305f\u306a\u88dc\u5f37\u677f\u306f\u65e2\u5b58\u306e\u88dc\u5f37\u677f\u3092\u907f\u3051\u308b\u3088\u3046\u306b\u914d\u7f6e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002\u3053\u306e\u305f\u3081\u3001\u96a3\u63a5\u3059\u308b\u6eb6\u63a5\u90e8\u3067\u4e00\u5b9a\u306e\u5fdc\u529b\u96c6\u4e2d\u554f\u984c\u304c\u751f\u3058\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-2-improve-welding-quality\">2.2 \u6eb6\u63a5\u54c1\u8cea\u306e\u5411\u4e0a<\/h3>\n\n\n\n<p>\u6eb6\u63a5\u5de5\u7a0b\u3092\u53b3\u5bc6\u306b\u7ba1\u7406\u3057\u3001\u6b20\u9665\u306e\u306a\u3044\u6eb6\u63a5\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002\u8d85\u97f3\u6ce2\u63a2\u50b7\u8a66\u9a13\uff08UT\uff09\u3084\u653e\u5c04\u7dda\u900f\u904e\u8a66\u9a13\uff08RT\uff09\u306a\u3069\u306e\u9ad8\u5ea6\u306a\u6eb6\u63a5\u6280\u8853\u3068\u691c\u67fb\u65b9\u6cd5\u3092\u7528\u3044\u3066\u3001\u6eb6\u63a5\u6b20\u9665\u3092\u8fc5\u901f\u306b\u691c\u51fa\u3057\u3001\u4fee\u5fa9\u3057\u307e\u3059\u3002 <\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-3-ensure-material-quality\">2.3 \u6750\u6599\u306e\u54c1\u8cea\u3092\u78ba\u4fdd\u3059\u308b<\/h3>\n\n\n\n<p>\u521d\u671f\u6b20\u9665\u306e\u306a\u3044\u9ad8\u54c1\u8cea\u306e\u6750\u6599\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u6750\u6599\u7279\u6027\u304c\u8981\u6c42\u4e8b\u9805\u3092\u6e80\u305f\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u3001\u5b9a\u671f\u7684\u306b\u6750\u6599\u8a66\u9a13\u3092\u5b9f\u65bd\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-4-operate-equipment-properly\">2.4 \u6a5f\u5668\u306e\u9069\u5207\u306a\u64cd\u4f5c<\/h3>\n\n\n\n<p>\u904e\u8ca0\u8377\u3092\u9632\u6b62\u3059\u308b\u305f\u3081\u3001\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u306b\u5fc5\u8981\u306a\u8a13\u7df4\u3092\u5b9f\u65bd\u3059\u308b\u3002\u6a5f\u5668\u306e\u8010\u7528\u5e74\u6570\u3092\u5ef6\u3070\u3059\u305f\u3081\u3001\u8a2d\u8a08\u4ed5\u69d8\u306b\u5f93\u3063\u3066\u6a5f\u5668\u306e\u64cd\u4f5c\u304a\u3088\u3073\u4fdd\u5b88\u3092\u884c\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-5-perform-regular-maintenance-and-inspection\">2.5 \u5b9a\u671f\u7684\u306a\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3068\u70b9\u691c\u3092\u5b9f\u65bd\u3059\u308b<\/h3>\n\n\n\n<p>\u5929\u4e95\u30af\u30ec\u30fc\u30f3\u306e\u5b9a\u671f\u7684\u306a\u4fdd\u5b88\u70b9\u691c\u3092\u5b9f\u65bd\u3057\u3001\u7279\u306b\u65ad\u9762\u5f62\u72b6\u304c\u5909\u5316\u3059\u308b\u90e8\u5206\u306e\u76e3\u8996\u306b\u91cd\u70b9\u3092\u7f6e\u304d\u3001\u4e80\u88c2\u3092\u901f\u3084\u304b\u306b\u767a\u898b\u3057\u3066\u4fee\u7406\u3059\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"conclusion\">\u7d50\u8ad6<\/h2>\n\n\n\n<p>\u3053\u306e\u5929\u4e95\u30af\u30ec\u30fc\u30f3\u6841\u30a6\u30a7\u30d6\u4e80\u88c2\u89e3\u6790\u3067\u6982\u8aac\u3055\u308c\u3066\u3044\u308b\u5bfe\u7b56\u306f\u3001\u5929\u4e95\u30af\u30ec\u30fc\u30f3\u4e3b\u6841\u7aef\u90e8\u306e\u53ef\u5909\u65ad\u9762\u306b\u304a\u3051\u308b\u30a6\u30a7\u30d6\u4e80\u88c2\u3092\u52b9\u679c\u7684\u306b\u9632\u6b62\u304a\u3088\u3073\u8efd\u6e1b\u3057\u3001\u6a5f\u5668\u306e\u5b89\u5168\u306a\u904b\u7528\u3092\u78ba\u4fdd\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <\/p>","protected":false},"excerpt":{"rendered":"Web cracking at the variable cross-section at the end of the main girder is a common and serious problem in overhead cranes during long-term service. Understanding the causes of crack formation is essential for prevention and resolution. The following is an analysis of the causes of web cracking at the variable cross-section at the end of an overhead crane main girder. 1. Root Causes of Overhead Crane Girder Web Cracking 1.1 Stress Concentration To meet dimensional requirements as well as strength and stiffness needs under various working conditions, the end of the main girder is often designed with a variable cross-section. However, the geometric discontinuity at the section change creates [&hellip;]","protected":false},"featured_media":15933,"parent":0,"menu_order":0,"template":"single-SEO-Table.php","posts_category":[197],"posts_tag":[247],"acf":[],"_links":{"self":[{"href":"https:\/\/www.hndfcrane.com\/ja\/wp-json\/wp\/v2\/xmxposts\/15941"}],"collection":[{"href":"https:\/\/www.hndfcrane.com\/ja\/wp-json\/wp\/v2\/xmxposts"}],"about":[{"href":"https:\/\/www.hndfcrane.com\/ja\/wp-json\/wp\/v2\/types\/posts"}],"version-history":[{"count":7,"href":"https:\/\/www.hndfcrane.com\/ja\/wp-json\/wp\/v2\/xmxposts\/15941\/revisions"}],"predecessor-version":[{"id":15951,"href":"https:\/\/www.hndfcrane.com\/ja\/wp-json\/wp\/v2\/xmxposts\/15941\/revisions\/15951"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hndfcrane.com\/ja\/wp-json\/wp\/v2\/media\/15933"}],"wp:attachment":[{"href":"https:\/\/www.hndfcrane.com\/ja\/wp-json\/wp\/v2\/media?parent=15941"}],"wp:term":[{"taxonomy":"posts_category","embeddable":true,"href":"https:\/\/www.hndfcrane.com\/ja\/wp-json\/wp\/v2\/posts_category?post=15941"},{"taxonomy":"posts_tag","embeddable":true,"href":"https:\/\/www.hndfcrane.com\/ja\/wp-json\/wp\/v2\/posts_tag?post=15941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}