{"id":15126,"date":"2025-09-10T03:27:20","date_gmt":"2025-09-10T03:27:20","guid":{"rendered":"https:\/\/www.dgcrane.com\/?post_type=posts&#038;p=15126"},"modified":"2025-09-10T03:27:23","modified_gmt":"2025-09-10T03:27:23","slug":"single-girder-crane-main-beam-end-crack-repair","status":"publish","type":"posts","link":"https:\/\/www.dgcrane.com\/cs\/posts\/single-girder-crane-main-beam-end-crack-repair\/","title":{"rendered":"Oprava trhlin na konci hlavn\u00edho nosn\u00edku jednonosn\u00edkov\u00e9ho je\u0159\u00e1bu"},"content":{"rendered":"<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><p>Obsah<\/p><nav><ul><li><a href=\"#crack-cause-analysis\">Anal\u00fdza p\u0159\u00ed\u010din trhlin<\/a><ul><li><a href=\"#1-stress-concentration\">1. Koncentrace stresu<\/a><\/li><li><a href=\"#2-welding-defects\">2. Vady sva\u0159ov\u00e1n\u00ed<\/a><\/li><li><a href=\"#3-fatigue-load\">3. \u00danavov\u00e9 zat\u00ed\u017een\u00ed<\/a><\/li><li><a href=\"#4-eccentric-load-trolley-mismatch\">4. Excentrick\u00e9 zat\u00ed\u017een\u00ed a nesoulad voz\u00edku<\/a><\/li><\/ul><\/li><li><a href=\"#repair-recommendations\">Doporu\u010den\u00ed k oprav\u011b<\/a><\/li><li><a href=\"#prevention-tips\">Tipy pro prevenci<\/a><\/li><li><a href=\"#conclusion\">Z\u00e1v\u011br<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<p>Analyzovali jsme 12 let star\u00fd 5t 31,5m jednonosn\u00edkov\u00fd je\u0159\u00e1b, u kter\u00e9ho se na konci hlavn\u00edho nosn\u00edku objevily praskliny (modr\u00fd r\u00e1me\u010dek na fotografii). Zde je anal\u00fdza p\u0159\u00ed\u010din a doporu\u010den\u00ed k oprav\u011b pro va\u0161i informaci.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1080\" height=\"720\" src=\"https:\/\/www.dgcrane.com\/wp-content\/uploads\/2025\/09\/Single-Girder-Crane-Main-Beam-End-Crack-Repair-Analysis.png\" alt=\"\" class=\"wp-image-15127\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"crack-cause-analysis\">Anal\u00fdza p\u0159\u00ed\u010din trhlin<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-stress-concentration\">1. Koncentrace stresu<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Konec nosn\u00edku m\u00e1 \u010dasto prom\u011bnn\u00fd pr\u016f\u0159ez, aby se u\u0161et\u0159il materi\u00e1l a z\u00e1rove\u0148 splnily po\u017eadavky na pevnost a tuhost. Ostr\u00e9 p\u0159echody (jako je pravo\u00fahl\u00fd roh na fotografii) mohou v\u00e9st ke koncentraci nap\u011bt\u00ed, co\u017e \u010din\u00ed oblast n\u00e1chylnou k prask\u00e1n\u00ed p\u0159i dlouhodob\u00e9m zat\u00ed\u017een\u00ed.<\/li>\n\n\n\n<li>\u00dahly spojen\u00ed a n\u00e1hl\u00e9 zm\u011bny geometrie naru\u0161uj\u00ed plynul\u00fd p\u0159enos zat\u00ed\u017een\u00ed, omezuj\u00ed deformaci nosn\u00edku a zvy\u0161uj\u00ed akumulaci nap\u011bt\u00ed, co\u017e podporuje vznik trhlin.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-welding-defects\">2. Vady sva\u0159ov\u00e1n\u00ed<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nespr\u00e1vn\u00e9 sva\u0159ov\u00e1n\u00ed (nap\u0159. p\u00f3rovitost, vm\u011bstky strusky, nedostatek taven\u00ed) m\u016f\u017ee vytv\u00e1\u0159et body nap\u011bt\u00ed, kter\u00e9 se st\u00e1vaj\u00ed v\u00fdchoz\u00edm bodem pro vznik trhlin.<\/li>\n\n\n\n<li>Obzvl\u00e1\u0161t\u011b obt\u00ed\u017en\u011b se ovl\u00e1d\u00e1j\u00ed oblasti se slo\u017eit\u00fdmi svary, jako jsou ostr\u00e9 rohy s prom\u011bnn\u00fdmi pr\u016f\u0159ezy.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-fatigue-load\">3. \u00danavov\u00e9 zat\u00ed\u017een\u00ed<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dlouhodob\u00fd provoz p\u0159i dynamick\u00e9m zat\u00ed\u017een\u00ed v kombinaci s koncentrac\u00ed nap\u011bt\u00ed na prom\u011bnn\u00fdch pr\u016f\u0159ezech m\u016f\u017ee v\u00e9st k \u00fanavov\u00fdm trhlin\u00e1m.<\/li>\n\n\n\n<li>Nerovnom\u011brn\u00fd pohyb voz\u00edku nebo velk\u00e9 mezery ve spoj\u00edch kolej\u00ed mohou zp\u016fsobit r\u00e1zov\u00e9 zat\u00ed\u017een\u00ed, kter\u00e9 urychluje \u0161\u00ed\u0159en\u00ed trhlin.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-eccentric-load-trolley-mismatch\">4. Excentrick\u00e9 zat\u00ed\u017een\u00ed a nesoulad voz\u00edku<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u010cast\u00e9 zved\u00e1n\u00ed v bl\u00edzkosti jedn\u00e9 strany nosn\u00edku m\u016f\u017ee zp\u016fsobit nesoulad voz\u00edku a zav\u00e9st torzn\u00ed zat\u00ed\u017een\u00ed soust\u0159ed\u011bn\u00e9 na konci nosn\u00edku.<\/li>\n\n\n\n<li>Nespr\u00e1vn\u00e9 pojezdy nebo kontakt s kolejnic\u00ed (pohyb koleje\/z\u00e1kus kolejnice) situaci d\u00e1le zhor\u0161uj\u00ed.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"repair-recommendations\">Doporu\u010den\u00ed k oprav\u011b<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Svary v m\u00edst\u011b praskliny obruste a o\u010dist\u011bte.<\/li>\n\n\n\n<li>Vyvrtejte zar\u00e1\u017ekov\u00e9 otvory na konc\u00edch trhlin.<\/li>\n\n\n\n<li>Vy\u010dist\u011bte a znovu sva\u0159te trhliny za otvory pro zar\u00e1\u017eky.<\/li>\n\n\n\n<li>Namontujte v\u00fdztu\u017en\u00e9 desky na ob\u011b bo\u010dn\u00ed stojinov\u00e9 desky, pokr\u00fdvaj\u00edc\u00ed 200 mm od rohu sm\u011brem ke st\u0159edu rozp\u011bt\u00ed a\u017e ke konci nosn\u00edku.<\/li>\n\n\n\n<li>P\u0159idejte otvory pro z\u00e1slepkov\u00e9 svary na v\u00fdztu\u017en\u00e9 desky a sva\u0159te je po okraj\u00edch; pokud je to mo\u017en\u00e9, nainstalujte v\u00fdztuhy na spoji p\u0159\u00edrubov\u00fdch desek pro v\u011bt\u0161\u00ed tuhost.<\/li>\n\n\n\n<li>\u010ci\u0161t\u011bn\u00ed a lakov\u00e1n\u00ed po sva\u0159ov\u00e1n\u00ed.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"prevention-tips\">Tipy pro prevenci<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pro sn\u00ed\u017een\u00ed koncentrace nap\u011bt\u00ed pou\u017eijte v n\u00e1vrhu hladk\u00e9 p\u0159echody mezi pr\u016f\u0159ezy.<\/li>\n\n\n\n<li>P\u0159\u00edsn\u011b kontrolovat kvalitu sva\u0159ov\u00e1n\u00ed.<\/li>\n\n\n\n<li>Prov\u00e1d\u011bjte pravideln\u00e9 kontroly, abyste odhalili v\u010dasn\u00e9 trhliny.<\/li>\n\n\n\n<li>Vyhn\u011bte se p\u0159et\u00ed\u017een\u00ed a dodr\u017eujte spr\u00e1vn\u00e9 provozn\u00ed postupy.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"conclusion\">Z\u00e1v\u011br<\/h2>\n\n\n\n<p>Spr\u00e1vn\u00e1 anal\u00fdza, v\u010dasn\u00e9 opravy a preventivn\u00ed opat\u0159en\u00ed jsou kl\u00ed\u010dem k prodlou\u017een\u00ed \u017eivotnosti je\u0159\u00e1b\u016f a zaji\u0161t\u011bn\u00ed bezpe\u010dn\u00e9ho provozu. Pravideln\u00e9 kontroly, kvalitn\u00ed sva\u0159ov\u00e1n\u00ed a pe\u010dliv\u00e9 zach\u00e1zen\u00ed mohou zabr\u00e1nit vzniku a \u0161\u00ed\u0159en\u00ed trhlin a udr\u017eet va\u0161e za\u0159\u00edzen\u00ed spolehliv\u00e9 a efektivn\u00ed.<\/p>","protected":false},"excerpt":{"rendered":"Analyzovali jsme 12 let star\u00fd 5t 31,5m jednonosn\u00edkov\u00fd je\u0159\u00e1b, u kter\u00e9ho se na konci hlavn\u00edho nosn\u00edku objevily praskliny (modr\u00fd r\u00e1me\u010dek na fotografii). Zde je anal\u00fdza p\u0159\u00ed\u010din a doporu\u010den\u00ed k oprav\u011b pro va\u0161i informaci. Anal\u00fdza p\u0159\u00ed\u010din trhlin 1. Koncentrace nap\u011bt\u00ed 2. Vady sva\u0159ov\u00e1n\u00ed 3. \u00danavov\u00e9 zat\u00ed\u017een\u00ed 4. Excentrick\u00e9 zat\u00ed\u017een\u00ed a nesoulad voz\u00edku Doporu\u010den\u00ed k oprav\u011b Tipy pro prevenci Z\u00e1v\u011br Spr\u00e1vn\u00e1 anal\u00fdza, v\u010dasn\u00e1 oprava a preventivn\u00ed [\u2026]","protected":false},"featured_media":15127,"parent":0,"menu_order":0,"template":"single-SEO-Table.php","posts_category":[351],"posts_tag":[957],"class_list":["post-15126","posts","type-posts","status-publish","has-post-thumbnail","hentry","posts_category-blog","posts_tag-crane-repair"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/xmxposts\/15126"}],"collection":[{"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/xmxposts"}],"about":[{"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/types\/posts"}],"version-history":[{"count":4,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/xmxposts\/15126\/revisions"}],"predecessor-version":[{"id":15131,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/xmxposts\/15126\/revisions\/15131"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/media\/15127"}],"wp:attachment":[{"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/media?parent=15126"}],"wp:term":[{"taxonomy":"posts_category","embeddable":true,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/posts_category?post=15126"},{"taxonomy":"posts_tag","embeddable":true,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/posts_tag?post=15126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}