{"id":2568,"date":"2022-06-15T21:48:41","date_gmt":"2022-06-15T19:48:41","guid":{"rendered":"https:\/\/beta.svetkamene.eu\/?p=2568"},"modified":"2022-06-14T22:58:50","modified_gmt":"2022-06-14T20:58:50","slug":"vyber-stipaci-sily-jaka-by-mela-byt-sila-stipacky","status":"publish","type":"post","link":"https:\/\/svetkamene.eu\/index.php\/cs\/2022\/06\/15\/vyber-stipaci-sily-jaka-by-mela-byt-sila-stipacky\/","title":{"rendered":"V\u00ddB\u011aR \u0160T\u00cdPAC\u00cd S\u00cdLY \u2013 JAK\u00c1 BY M\u011aLA B\u00ddT S\u00cdLA \u0160T\u00cdPA\u010cKY"},"content":{"rendered":"\n<p>Tento \u010dl\u00e1nek je kr\u00e1tk\u00fdm v\u00fdtahem p\u0159\u00edsp\u011bvku, kter\u00fd na konferenci \u201eVyu\u017e\u00edv\u00e1n\u00ed zdroj\u016f nerostn\u00fdch surovin\u201c v&nbsp;Olomouci 11.&nbsp;kv\u011btna 2016 p\u0159ednesli Krzysztof&nbsp;Nowakowski (WRKB-Granit Sp. Z&nbsp;oo) a&nbsp;Micha\u0142 Firlej (Laborato\u0159 pro testov\u00e1n\u00ed kameniva a&nbsp;agreg\u00e1t\u016f\/um\u011bl\u00e9ho kameniva).<\/p>\n\n\n\n<p>Spole\u010dnost WRKB-Granit Sp. z&nbsp;o. o. je v&nbsp;Polsku zn\u00e1m\u00e1 v\u00fdrobou v\u00fdrobk\u016f z&nbsp;p\u0159\u00edrodn\u00edho kamene ze \u0160v\u00e9dska. Velkou \u010d\u00e1st produkt\u016f tvo\u0159\u00ed v\u00fdrobky st\u00edpan\u00e9 z&nbsp;desek \u2013 opalovan\u00e9 a&nbsp;p\u00edskovan\u00e9 kostky, palis\u00e1dy a&nbsp;obrubn\u00edky. V\u00fdrobky jsou vyr\u00e1b\u011bny p\u0159ev\u00e1\u017en\u011b z&nbsp;vyv\u0159el\u00fdch hornin: Granite Bohus, Granite Flaming, Granite Flivik Mahagon, Granite Vanga a&nbsp;Noryt Szwed, tj.&nbsp;hornin s&nbsp;vysok\u00fdmi pevnostn\u00edmi parametry.<\/p>\n\n\n\n<p>P\u0159i pl\u00e1nov\u00e1n\u00ed roz\u0161\u00ed\u0159en\u00ed strojn\u00edho parku ve spole\u010dnosti bylo rozhodnuto simulovat chov\u00e1n\u00ed port\u00e1lov\u00e9ho \u0161t\u00edpa\u010de na materi\u00e1lech pou\u017eit\u00fdch pro v\u00fdrobky, proto\u017ee sou\u010dasn\u00e1 praxe nazna\u010duje, \u017ee tlakov\u00e9 s\u00edly no\u017e\u016f Widia na polotovar z&nbsp;tvrd\u00fdch materi\u00e1l\u016f jsou p\u0159\u00edli\u0161 mal\u00fd.<\/p>\n\n\n\n<p>V diskutovan\u00e9m p\u0159\u00edpad\u011b se p\u0159edpokl\u00e1dalo, \u017ee na v\u00fdrobn\u00ed lince budou z\u0159\u00edzeny dva \u0161t\u00edpa\u010de, vybaven\u00e9 rovn\u00fdmi no\u017ei Widia a&nbsp;s&nbsp;pracovn\u00edm rozsm\u011brem 180 \u00d7 20 cm a&nbsp;40 \u00d7 20 cm.<\/p>\n\n\n\n<p>Za t\u00edmto \u00fa\u010delem byly pro laboratorn\u00ed pevnostn\u00ed lis p\u0159ipraveny dv\u011b desky s&nbsp;p\u0159ip\u00e1jen\u00fdmi no\u017ei z&nbsp;vidia, kter\u00e9 byly pot\u00e9 instalov\u00e1ny mezi p\u0159\u00edtla\u010dn\u00e9 desky stroje.<\/p>\n\n\n\n<p>Pro zkou\u0161ku byly p\u0159ijaty n\u00e1sleduj\u00edc\u00ed p\u0159edpoklady:<br>\u2013 zku\u0161ebn\u00ed stroj mus\u00ed b\u00fdt v&nbsp;souladu s&nbsp;normou EN 12390,<br>\u2013 zku\u0161ebn\u00ed vzorky jsou 20 kousk\u016f na\u0159ezan\u00fdch krychl\u00ed <br>s rozm\u011brem 100 \u00d7 100 \u00d7 100 mm, vysu\u0161en\u00fdch do konstantn\u00ed hmotnosti <br>p\u0159i 70 \u00b0C,<br>\u2013 rychlost zat\u00ed\u017een\u00ed 0,20 MPa\/s,<br>\u2013 zji\u0161\u0165ujeme zji\u0161t\u011bnou mez pevnosti F [N],<br>\u2013 vypo\u010d\u00edt\u00e1me pevnost v&nbsp;tlaku R = F\/A [MPa].<\/p>\n\n\n\n<p>U ka\u017ed\u00e9ho z&nbsp;kamen\u016f byla provedena zkou\u0161ka pevnosti v&nbsp;tlaku na dvaceti vzorc\u00edch odeb\u00edran\u00fdch systematicky po&nbsp;dobu 6 m\u011bs\u00edc\u016f.<\/p>\n\n\n\n<p>V\u00fdsledky jsou uvedeny v&nbsp;tabulce 2, kter\u00e1 shrnuje o\u010dek\u00e1van\u00e9 vy\u0161\u0161\u00ed hodnoty pro jednotliv\u00e9 materi\u00e1ly. Jak je patrn\u00e9 z&nbsp;prezentovan\u00fdch v\u00fdsledk\u016f, neexistuje \u017e\u00e1dn\u00e1 p\u0159\u00edm\u00e1 z\u00e1vislost mezi pevnost\u00ed v&nbsp;tlaku a&nbsp;pevnost\u00ed v&nbsp;lomu.<\/p>\n\n\n\n<figure class=\"wp-container-2 wp-block-gallery-1 wp-block-gallery aligncenter has-nested-images columns-default is-cropped\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" width=\"640\" height=\"208\" data-id=\"2569\"  src=\"https:\/\/beta.svetkamene.eu\/wp-content\/uploads\/2021\/01\/SL2_cz.jpg\" alt=\"\" class=\"wp-image-2569\" srcset=\"https:\/\/svetkamene.eu\/wp-content\/uploads\/2021\/01\/SL2_cz.jpg 640w, https:\/\/svetkamene.eu\/wp-content\/uploads\/2021\/01\/SL2_cz-300x98.jpg 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n<figcaption class=\"blocks-gallery-caption\"><em>Tabulka 1:&nbsp; Vlastnosti materi\u00e1l\u016f ze kter\u00fdch jsou vyr\u00e1b\u011bny v\u00fdrobky&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:48px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>P\u0159i v\u00fdb\u011bru samotn\u00e9 \u0161t\u00edpac\u00ed s\u00edly bereme v&nbsp;\u00favahu materi\u00e1l, kter\u00fd je nejt\u011b\u017e\u0161\u00ed roz\u0161t\u00edpnout, tj.&nbsp;\u0161v\u00e9dskou \u017eulu. D\u00e1le zavedeme bezpe\u010dnostn\u00ed faktor 1,2. <br>S\u00edla F, pot\u0159ebn\u00e1 k&nbsp;destrukci prvku bude vypo\u010d\u00edt\u00e1na ze vzorce: <br>F = 1,2 * R * A, kde:<\/p>\n\n\n\n<p>R \u2013 Pevnost v&nbsp;tlaku [MPa]<br>A \u2013 plocha d\u011blen\u00e9 desky [mm\u00b2]<\/p>\n\n\n\n<p>Za p\u0159edpokladu d\u0159\u00edve specifikovan\u00e9 \u0161t\u00edpac\u00ed s\u00edly \u0161v\u00e9dsk\u00e9 \u017euly (13,1 MPa) pro v\u00fdchoz\u00ed p\u0159edpoklady o&nbsp;velikosti pr\u016f\u0159ezu a&nbsp;typu suroviny &#8211; v\u00fdpo\u010det pracovn\u00ed s\u00edly \u0161t\u00edpac\u00edho stroje bude n\u00e1sleduj\u00edc\u00ed:<\/p>\n\n\n\n<p>\u2013 pro \u00fasek 180 \u00d7 20 cm: 13,1 \u00d7 1800 \u00d7 200 \u00d7 1,2 = 5659 kN<br>\u2013 pro \u00fasek 40 \u00d7 20 cm: 13,1 \u00d7 400 \u00d7 200 \u00d7 1,2 = 1258 kN<\/p>\n\n\n\n<figure class=\"wp-container-4 wp-block-gallery-3 wp-block-gallery aligncenter has-nested-images columns-default is-cropped\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" width=\"640\" height=\"191\" data-id=\"2570\"  src=\"https:\/\/beta.svetkamene.eu\/wp-content\/uploads\/2021\/01\/SL3_cz.jpg\" alt=\"\" class=\"wp-image-2570\" srcset=\"https:\/\/svetkamene.eu\/wp-content\/uploads\/2021\/01\/SL3_cz.jpg 640w, https:\/\/svetkamene.eu\/wp-content\/uploads\/2021\/01\/SL3_cz-300x90.jpg 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n<figcaption class=\"blocks-gallery-caption\"><em>Tabulka 2: Sestava v\u00fdsledk\u016f zkou\u0161ek<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:26px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div style=\"height:49px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Zdroj: <a href=\"https:\/\/www.kurierkamieniarski.pl\/artykuly\/o-kamieniu\/604-dobor-siy-upania.html\" target=\"_blank\" rel=\"noreferrer noopener\">Kurier kamieniarski<\/a><\/p>\n\n\n\n<p>Autor: Micha\u0142 Firlej | Publikov\u00e1no: 27.&nbsp;\u010dervna 2016<\/p>\n\n\n\n<p><br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tento \u010dl\u00e1nek je kr\u00e1tk\u00fdm v\u00fdtahem p\u0159\u00edsp\u011bvku, kter\u00fd na konferenci \u201eVyu\u017e\u00edv\u00e1n\u00ed zdroj\u016f nerostn\u00fdch surovin\u201c v&nbsp;Olomouci 11.&nbsp;kv\u011btna&#8230;<\/p>\n","protected":false},"author":13,"featured_media":2571,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[372],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.1 - 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