{"id":16044,"date":"2026-06-11T12:38:58","date_gmt":"2026-06-11T10:38:58","guid":{"rendered":"https:\/\/jansametal.com\/5-errors-que-cometes-al-escollir-el-sistema-estructural-del-tu-projecte\/"},"modified":"2026-06-17T10:03:04","modified_gmt":"2026-06-17T08:03:04","slug":"5-errors-que-cometes-al-escollir-el-sistema-estructural-del-tu-projecte","status":"publish","type":"post","link":"https:\/\/jansametal.com\/ca\/5-errors-que-cometes-al-escollir-el-sistema-estructural-del-tu-projecte\/","title":{"rendered":"5 errors que cometes en triar el sistema estructural del teu projecte"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Ning\u00fa no en parla en el pressupost. Per\u00f2 tots els coneixen quan ja \u00e9s massa tard. Aquesta \u00e9s la llista que tant de bo haguessis llegit abans de signar.  <\/strong><\/p>\n\n<div class=\"wp-block-uagb-blockquote uagb-block-1a618f3d uagb-blockquote__skin-border uagb-blockquote__stack-img-none\"><blockquote class=\"uagb-blockquote\"><div class=\"uagb-blockquote__content\"><em>Cada any es prenen decisions estructurals que semblen correctes sobre paper i es converteixen en malsons en obra. L&#8217;error gaireb\u00e9 mai no est\u00e0 en el c\u00e0lcul. Est\u00e0 en all\u00f2 que ning\u00fa et va explicar abans d&#8217;escollir el sistema constructiu.  <\/em><\/div><footer><div class=\"uagb-blockquote__author-wrap uagb-blockquote__author-at-left\"><cite class=\"uagb-blockquote__author\">Joan Juanola<\/cite><\/div><\/footer><\/blockquote><\/div>\n\n<div class=\"wp-block-uagb-separator uagb-block-77b52559\"><div class=\"uagb-separator-spacing-wrapper\"><div class=\"wp-block-uagb-separator__inner\" style=\"--my-background-image:\"><\/div><\/div><\/div>\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-93dcd06d\"><h2 class=\"uagb-heading-text\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\"><strong>ERROR N\u00ba 1<\/strong> :<\/mark> <strong>Calcular el termini d&#8217;obra comptant nom\u00e9s els dies de treball efectiu<\/strong><\/h2><\/div>\n\n<p class=\"wp-block-paragraph\">Quan un promotor o cap d&#8217;obra elabora el cronograma, sol planificar els dies previstos per col\u00b7locar l&#8217;estructura i passar-hi p\u00e0gina. L&#8217;error \u00e9s oblidar els temps en qu\u00e8 l&#8217;obra no est\u00e0 preparada, <strong>no es pot treballar i, per tant, no avan\u00e7a<\/strong> . Aquest <strong>temps perdut<\/strong> no s\u00f3n nom\u00e9s dies que s&#8217;acumulen: a m\u00e9s fan perdre el ritme de treball. La in\u00e8rcia que suposa reprendre l&#8217;activitat despr\u00e9s de cada aturada redueix els dies efectius, de manera que acabem necessitant m\u00e9s jornades de les que haur\u00edem previst si no hi haguessin interrupcions.   <\/p>\n\n<p class=\"wp-block-paragraph\">Determinats sistemes constructius exigeixen que, un cop executada l&#8217;estructura, <strong>no es pugui treballar en planta durant setmanes<\/strong> . Els forjats queden apuntalats. Els gremis d&#8217;instal\u00b7lacions, envans i acabats no poden entrar a treballar. El cronograma es dilata, el lloguer de grua i bastides es prolonga, i la penalitzaci\u00f3 de lliurament comen\u00e7a a treure el cap.   <\/p>\n\n<div class=\"wp-block-uagb-blockquote uagb-block-ecff5f38 uagb-blockquote__skin-border uagb-blockquote__stack-img-none\"><blockquote class=\"uagb-blockquote\"><div class=\"uagb-blockquote__content\"><em>Abans d&#8217;escollir el teu sistema estructural, pregunta&#8217;t: Com puc fer perqu\u00e8 l&#8217;estructura es pugui muntar sense interrupcions, quants dies pot entrar el seg\u00fcent gremi a treballar a l&#8217;estructura? Aquesta resposta val m\u00e9s que qualsevol preu de material per tona. <\/em><\/div><footer><div class=\"uagb-blockquote__author-wrap uagb-blockquote__author-at-left\"><\/div><\/footer><\/blockquote><\/div>\n\n<p class=\"wp-block-paragraph\" style=\"margin-top:20px\">Els <a href=\"https:\/\/jansametal.com\/ca\/jansbuild\/\" data-type=\"page\" data-id=\"4253\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">sistemes de muntatge en sec<\/mark><\/a> permeten que, quan una zona queda muntada, la resta d&#8217;oficis hi puguin accedir immediatament. Aix\u00ed doncs, el temps que l&#8217;estructura mant\u00e9 l&#8217;obra detinguda es redueix al m\u00ednim. <\/p>\n\n<h2 class=\"wp-block-heading\" style=\"margin-bottom:30px\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">ERROR N\u00ba2:<\/mark> <strong><strong>Pressupostar l&#8217;estructura sense calcular els dies perduts entre activitats, fonamentaci\u00f3+estructura+resta de partides<\/strong> .<\/strong> <\/h2>\n\n<p class=\"wp-block-paragraph\">Avui m\u00e9s que mai, <strong>el temps \u00e9s or<\/strong> . <strong>Cada dia d&#8217;obra suposa una despesa important en recursos i costos d&#8217;infraestructura,<\/strong> per\u00f2, sobretot, el temps dedicat a l&#8217;estructura t\u00e9 una conseq\u00fc\u00e8ncia directa i molt cara: marca el retard i el cost de totes les altres partides de l&#8217;obra.<\/p>\n\n<p class=\"wp-block-paragraph\">En molts projectes, l&#8217;estructura no representa m\u00e9s del 20% del pressupost total. I, tanmateix, pot influir en bona part del cost de les altres partides, un cost que es reduiria notablement si l&#8217;estructura es planteg\u00e9s amb <strong>el factor temps i la precisi\u00f3 com a prioritat.<\/strong> <\/p>\n\n<p class=\"wp-block-paragraph\">La paradoxa \u00e9s que sovint es tria el sistema estructural pel preu del material, sense tenir en compte l&#8217;estalvi o l&#8217;increment del temps i el cost de les altres partides.<\/p>\n\n<div class=\"wp-block-uagb-blockquote uagb-block-e8f39733 uagb-blockquote__skin-border uagb-blockquote__stack-img-none\"><blockquote class=\"uagb-blockquote\"><div class=\"uagb-blockquote__content\"><em><em>El cost real d&#8217;una estructura no \u00e9s el que pesa ni el que costa, sin\u00f3 l&#8217;estalvi que genera en <strong>temps i diners<\/strong> . Un sistema estructural basat en el <strong>factor temps efectiu,<\/strong> ben aprofitat, <strong>redueix de manera molt significativa els costos de tota l&#8217;obra<\/strong> i abarateix cadascuna de les partides seg\u00fcents. <\/em><\/em><\/div><footer><div class=\"uagb-blockquote__author-wrap uagb-blockquote__author-at-left\"><\/div><\/footer><\/blockquote><\/div>\n\n<figure class=\"wp-block-image size-large is-resized\" style=\"margin-top:20px\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/jansametal.com\/wp-content\/uploads\/2026\/06\/diseno_estructural-1024x768.jpg\" alt=\"\" class=\"wp-image-15806\" style=\"width:600px\" srcset=\"https:\/\/jansametal.com\/wp-content\/uploads\/2026\/06\/diseno_estructural-1024x768.jpg 1024w, https:\/\/jansametal.com\/wp-content\/uploads\/2026\/06\/diseno_estructural-300x225.jpg 300w, https:\/\/jansametal.com\/wp-content\/uploads\/2026\/06\/diseno_estructural-768x576.jpg 768w, https:\/\/jansametal.com\/wp-content\/uploads\/2026\/06\/diseno_estructural.jpg 1448w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">ERROR N\u00ba3:<\/mark> <strong><strong>Acceptar que la qualitat estructural depengui de la compet\u00e8ncia dels operaris a l&#8217;obra<\/strong><\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">En construcci\u00f3, hi ha una variable que rarament apareix als contractes per\u00f2 que condiciona el resultat final: <strong>l&#8217;habilitat i la compet\u00e8ncia dels operaris que executen l&#8217;obra<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">Els sistemes que es construeixen enterament en obra, amb barreges, abocaments, encofrats i armadures muntades a peu de solar, introdueixen una variabilitat intr\u00ednseca dif\u00edcil de controlar. El resultat dep\u00e8n del clima d?aquell dia, del cami\u00f3 que va arribar tard, de l?experi\u00e8ncia de l?oficial i de desenes de factors que no figuren en cap pla. <\/p>\n\n<p class=\"wp-block-paragraph\">Els sistemes que es fabriquen <a href=\"https:\/\/jansametal.com\/ca\/proces-jansa\/\" data-type=\"page\" data-id=\"10151\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\"><strong>\u00edntegrament en f\u00e0brica<\/strong><\/mark><\/a> , en un proc\u00e9s industrialitzat i condicions controlades, amb <a href=\"https:\/\/jansametal.com\/ca\/calcul-estructural\/\" data-type=\"page\" data-id=\"4282\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\"><strong>maquin\u00e0ria de precisi\u00f3<\/strong><\/mark><\/a> i amb inspeccions de qualitat formalitzades, eliminen aquesta loteria. Quan el material arriba a obra, la qualitat ja est\u00e0 garantida. A l&#8217;obra nom\u00e9s queda l&#8217;assemblatge.  <\/p>\n\n<div class=\"wp-block-uagb-blockquote uagb-block-159c4da9 uagb-blockquote__skin-border uagb-blockquote__stack-img-none\"><blockquote class=\"uagb-blockquote\"><div class=\"uagb-blockquote__content\"><em><em><em>La pregunta no \u00e9s si el vostre prove\u00efdor t\u00e9 bons operaris. La pregunta \u00e9s: quina part del proc\u00e9s de qualitat passa a f\u00e0brica, i quina part passa a l&#8217;obra? Com m\u00e9s passi a f\u00e0brica, menys risc hi ha a l&#8217;obra.  <\/em><\/em><\/em><\/div><footer><div class=\"uagb-blockquote__author-wrap uagb-blockquote__author-at-left\"><\/div><\/footer><\/blockquote><\/div>\n\n<h2 class=\"wp-block-heading\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">ERROR N\u00ba4:<\/mark> <strong><strong><strong>Triar una estructura que avui sobre el projecte funciona per\u00f2 que dem\u00e0 a la realitat el bloqueja<\/strong><\/strong><\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">Una estructura no dura cinc anys. Dura cinquanta o m\u00e9s. I el que avui \u00e9s una nau log\u00edstica, d&#8217;aqu\u00ed a deu anys pot necessitar canvis, obertures, mezanins, marquesines, etc. El que avui \u00e9s un local de magatzem, pot necessitar convertir-se en un espai per a oficines, laboratoris o qui sap qu\u00e8.   <\/p>\n\n<p class=\"wp-block-paragraph\">L&#8217;error \u00e9s triar sistemes estructurals inamovibles, que requereixen <strong>pilars cada pocs metres o murs de c\u00e0rrega que fragmenten l&#8217;espai interior<\/strong> . S\u00f3n solucions que resolen el problema d&#8217;avui, per\u00f2 condemnen les opcions del futur. <\/p>\n\n<p class=\"wp-block-paragraph\">La construcci\u00f3 moderna demanda <a href=\"https:\/\/jansametal.com\/ca\/janstil\/\" data-type=\"page\" data-id=\"4247\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\"><strong>plantes lliures i flexibles<\/strong><\/mark><\/a> . No nom\u00e9s per est\u00e8tica, sin\u00f3 perqu\u00e8 l?\u00fas dels edificis canvia. Un sistema que permet salvar <a href=\"https:\/\/jansametal.com\/ca\/jansbeam\/\" data-type=\"page\" data-id=\"4263\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\"><strong>grans llums amb perfils esvelts<\/strong><\/mark><\/a> converteix qualsevol planta en un llen\u00e7 en blanc que es pot redistribuir sense tocar l&#8217;estructura.  <\/p>\n\n<div class=\"wp-block-uagb-blockquote uagb-block-3fcb14ea uagb-blockquote__skin-border uagb-blockquote__stack-img-none\"><blockquote class=\"uagb-blockquote\"><div class=\"uagb-blockquote__content\"><em><em><em><em>Quin diferencial t\u00e9 una estructura que permet ampliar, refor\u00e7ar o modificar ledifici en el futur amb una intervenci\u00f3 m\u00ednima? Al m\u00f3n de l&#8217;acer, afegir un nivell, obrir un pas o refor\u00e7ar una biga s\u00f3n operacions que un equip especialitzat pot fer sense enderrocar res. <\/em><\/em><\/em><\/em><\/div><footer><div class=\"uagb-blockquote__author-wrap uagb-blockquote__author-at-left\"><\/div><\/footer><\/blockquote><\/div>\n\n<h2 class=\"wp-block-heading\" style=\"margin-top:38px\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">ERROR N\u00ba5:<\/mark> <strong><strong><strong><strong>Contractar l&#8217;estructura sense preveure on passaran les instal\u00b7lacions<\/strong><\/strong><\/strong><\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">Aquest \u00e9s, possiblement, l&#8217;error que m\u00e9s emprenya genera en obra. I tamb\u00e9 el m\u00e9s evitable. <\/p>\n\n<p class=\"wp-block-paragraph\">La seq\u00fc\u00e8ncia cl\u00e0ssica \u00e9s aquesta: s&#8217;acaba l&#8217;estructura, arriba l&#8217;equip de climatitzaci\u00f3 o lampisteria i descobreix que les bigues o els forjats bloquegen el tra\u00e7at dels conductes. <strong>Alg\u00fa ha de comen\u00e7ar a picar, foradar o improvisar<\/strong> . El cap dobra discuteix amb els gremis, apareixen fissures o debilitaments no previstos, i ning\u00fa assumeix la responsabilitat. <\/p>\n\n<p class=\"wp-block-paragraph\">La causa no \u00e9s la mala fe de ning\u00fa. \u00c9s la manca d\u201fun proc\u00e9s d\u201fenginyeria de detall previ al\u201finici d\u201fobra. Si l&#8217;estructura no s&#8217;ha dibuixat en 3D amb les instal\u00b7lacions a dins, abans de fabricar res, la col\u00b7lisi\u00f3 \u00e9s pr\u00e0cticament inevitable.  <\/p>\n\n<p class=\"wp-block-paragraph\">Els sistemes constructius que <strong>obliguen a resoldre tota la geometria abans de fabricar<\/strong> , perqu\u00e8 al taller no es pot improvisar, s\u00f3n els que arriben a obra sense sorpreses. Les bigues poden sortir ja amb els passatubs i alv\u00e8ols necessaris, perfectament calculats. Les instal\u00b7lacions passen netament a trav\u00e9s de l&#8217;estructura, sense fregues ni modificacions.  <\/p>\n\n<div class=\"wp-block-uagb-blockquote uagb-block-3c948ac5 uagb-blockquote__skin-border uagb-blockquote__stack-img-none\"><blockquote class=\"uagb-blockquote\"><div class=\"uagb-blockquote__content\"><em><em><em><em><em>Aquest \u00e9s un bon exemple de com la \u201crigidesa\u201d del proc\u00e9s de taller \u00e9s, en realitat, un enorme avantatge: t&#8217;obliga a pensar-ho tot abans de construir. I aix\u00f2 \u00e9s exactament el que separa un projecte que acaba en un termini que genera discussions fins a l&#8217;\u00faltim dia. <\/em><\/em><\/em><\/em><\/em><\/div><footer><div class=\"uagb-blockquote__author-wrap uagb-blockquote__author-at-left\"><\/div><\/footer><\/blockquote><\/div>\n\n<p class=\"wp-block-paragraph\" style=\"margin-top:30px\">En sistemes r\u00edgids, qualsevol modificaci\u00f3 futura implica obres costoses, incertesa estructural i, en molts casos, la decisi\u00f3 de no fer-ho. L&#8217;edifici queda congelat. <\/p>\n\n<div class=\"wp-block-uagb-container uagb-block-10f85894 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<div class=\"wp-block-uagb-advanced-heading uagb-block-1e54eb49\"><h2 class=\"uagb-heading-text\"><strong>El que tenen en com\u00fa aquests cinc errors<\/strong><\/h2><\/div>\n\n\n\n<p class=\"has-cyan-bluish-gray-color has-text-color has-link-color wp-elements-06aa1e6e5fa12892430d96f97fe245ef wp-block-paragraph\" style=\"margin-bottom:-10px\">Cap d&#8217;ells no apareix al pressupost inicial. Tothom apareix despr\u00e9s, quan el projecte ja est\u00e0 en marxa i canviar ja \u00e9s molt complicat o impossible. <\/p>\n\n\n\n<p class=\"has-cyan-bluish-gray-color has-text-color has-link-color wp-elements-a769a57a7a4f1a38196e26b7513d4371 wp-block-paragraph\" style=\"margin-bottom:-10px\">La bona not\u00edcia \u00e9s que tots s\u00f3n evitables. La clau no \u00e9s al prove\u00efdor m\u00e9s barat ni al m\u00e9s conegut. Est\u00e0 a triar un sistema constructiu basat en el FACTOR TEMPS EFECTIU, que resolgui el problema abans que arribi a obra: que no paralitzi l&#8217;obra, que no llasti la fonamentaci\u00f3, que no depengui de l&#8217;atzar a l&#8217;exterior, que no condemni el futur de l&#8217;edifici i que no generi guerres entre gremis.  <\/p>\n\n\n\n<p class=\"has-cyan-bluish-gray-color has-text-color has-link-color wp-elements-05db01e0de6e7c9f6b230dd6b065e808 wp-block-paragraph\">A Jansa Metal fa m\u00e9s de 40 anys que resolem exactament aix\u00f2. Si tens un projecte damunt la taula, explica&#8217;ns de qu\u00e8 es tracta. <\/p>\n<\/div><\/div>\n\n<div class=\"wp-block-uagb-buttons uagb-buttons__outer-wrap uagb-btn__default-btn uagb-btn-tablet__default-btn uagb-btn-mobile__default-btn uagb-block-52a7d396\"><div class=\"uagb-buttons__wrap uagb-buttons-layout-wrap \">\n<div class=\"wp-block-uagb-buttons-child uagb-buttons__outer-wrap uagb-block-c5373bd5 wp-block-button\"><div class=\"uagb-button__wrapper\"><a class=\"uagb-buttons-repeater wp-block-button__link\" aria-label=\"\" href=\"https:\/\/jansametal.com\/ca\/com-es-el-teu-projecte\/\" rel=\"follow noopener\" target=\"_self\" role=\"button\"><div class=\"uagb-button__link\">Evita aquests 5 errors a la teva propera obra<\/div><\/a><\/div><\/div>\n<\/div><\/div>\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ning\u00fa no en parla en el pressupost. Per\u00f2 tots els coneixen quan ja \u00e9s massa tard. Aquesta \u00e9s la llista que tant de bo haguessis llegit abans de signar. ERROR N\u00ba 1 : Calcular el termini d&#8217;obra comptant nom\u00e9s els dies de treball efectiu Quan un promotor o cap d&#8217;obra elabora el cronograma, sol planificar [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":15807,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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