{"id":5091,"date":"2026-01-27T08:23:58","date_gmt":"2026-01-27T08:23:58","guid":{"rendered":"https:\/\/eurohinca.com\/?p=5091"},"modified":"2026-01-27T08:30:47","modified_gmt":"2026-01-27T08:30:47","slug":"what-pre-tests-are-recommended-before-bidding-for-a-pipe-jacking-job","status":"publish","type":"post","link":"https:\/\/eurohinca.com\/en\/que-ensayos-previos-son-recomendables-antes-de-licitar-una-hinca-de-tuberia\/","title":{"rendered":"What pre-tests (laboratory and field) are recommended before bidding for a pipe jacking?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"5091\" class=\"elementor elementor-5091\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d6327ef e-flex e-con-boxed e-con e-parent\" data-id=\"d6327ef\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0d3dfe2 elementor-widget elementor-widget-text-editor\" data-id=\"0d3dfe2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"105\" data-end=\"554\">Before bidding for a <strong data-start=\"126\" data-end=\"207\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/pipe-jacking-2\/\" target=\"_new\" rel=\"noopener\" data-start=\"128\" data-end=\"205\">pipe jacking (microtunneling)<\/a><\/strong>, The most profitable approach is to invest in a previous campaign that reduces uncertainty in the market: <strong data-start=\"289\" data-end=\"399\">type of soil, permeability\/water table, strength-deformability, abrasiveness and front-end hazards<\/strong>. These data can be used to fine-tune the <strong data-start=\"435\" data-end=\"458\">equipment selection<\/strong>, The company's risk management system, well design and risk sharing in the supply.<\/p><h2 data-start=\"556\" data-end=\"634\">Recommended FIELD TESTS (geotechnical and hydrogeological investigation)<\/h2><ol data-start=\"635\" data-end=\"2140\"><li data-start=\"635\" data-end=\"940\"><p data-start=\"638\" data-end=\"707\"><strong data-start=\"638\" data-end=\"705\">Soundings along the route (and in attack\/reception wells).<\/strong><\/p><ul data-start=\"711\" data-end=\"940\"><li data-start=\"711\" data-end=\"822\"><p data-start=\"713\" data-end=\"822\">Continuous core (if applicable), stratigraphic description and unaltered sampling when possible.<\/p><\/li><li data-start=\"826\" data-end=\"940\"><p data-start=\"828\" data-end=\"940\"><strong data-start=\"828\" data-end=\"835\">SPT<\/strong> in granular soils \/ heterogeneous fills (at least for correlations and variability control).<\/p><\/li><\/ul><\/li><li data-start=\"942\" data-end=\"1155\"><p data-start=\"945\" data-end=\"1019\"><strong data-start=\"945\" data-end=\"1017\">CPT\/CPTu (static penetrometer, ideal in soft\/granular soils)<\/strong><\/p><ul data-start=\"1023\" data-end=\"1155\"><li data-start=\"1023\" data-end=\"1155\"><p data-start=\"1025\" data-end=\"1155\">Very useful for profiling stratum changes, estimating resistance and detecting granular lenses.<\/p><\/li><\/ul><\/li><li data-start=\"1157\" data-end=\"1507\"><p data-start=\"1160\" data-end=\"1214\"><strong data-start=\"1160\" data-end=\"1212\">Water control: water table and permeability<\/strong><\/p><ul data-start=\"1218\" data-end=\"1507\"><li data-start=\"1218\" data-end=\"1324\"><p data-start=\"1220\" data-end=\"1324\">Installation of <strong data-start=\"1235\" data-end=\"1250\">piezometers<\/strong> and monitoring (including seasonal variations or tides if applicable).<\/p><\/li><li data-start=\"1328\" data-end=\"1507\"><p data-start=\"1330\" data-end=\"1507\">Permeability tests <strong data-start=\"1355\" data-end=\"1366\">in situ<\/strong> (depending on terrain): Lefranc in soils, packer\/Lugeon in rock, and\/or <strong data-start=\"1430\" data-end=\"1451\">pumping tests<\/strong> if the aquifer can condition the front or the wells.<\/p><\/li><\/ul><\/li><li data-start=\"1509\" data-end=\"1802\"><p data-start=\"1512\" data-end=\"1562\"><strong data-start=\"1512\" data-end=\"1560\">Complementary in situ tests (as required)<\/strong><\/p><ul data-start=\"1566\" data-end=\"1802\"><li data-start=\"1566\" data-end=\"1680\"><p data-start=\"1568\" data-end=\"1680\"><strong data-start=\"1568\" data-end=\"1581\">Vane test<\/strong> in soft clays, <strong data-start=\"1603\" data-end=\"1622\">pressuremeter\/DMT<\/strong> if you need deformability and seating parameters.<\/p><\/li><li data-start=\"1684\" data-end=\"1802\"><p data-start=\"1686\" data-end=\"1802\">Geophysics (seismic, georadar, etc.) to detect heterogeneities, voids or contrasts if the environment justifies it.<\/p><\/li><\/ul><\/li><li data-start=\"1804\" data-end=\"2140\"><p data-start=\"1807\" data-end=\"1868\"><strong data-start=\"1807\" data-end=\"1866\">Recognition of services\/obstacles and constraints<\/strong><\/p><ul data-start=\"1872\" data-end=\"2140\"><li data-start=\"1872\" data-end=\"1964\"><p data-start=\"1874\" data-end=\"1964\">In urban: service detection campaigns + identification of sensitive structures.<\/p><\/li><li data-start=\"1968\" data-end=\"2140\"><p data-start=\"1970\" data-end=\"2140\">In crossings under watercourses: it may be necessary to complete with specific surveys (bathymetry\/topobatimetry) in addition to geotechnical surveys.<\/p><\/li><\/ul><\/li><\/ol><h2 data-start=\"2142\" data-end=\"2182\">Recommended LABORATORY tests<\/h2><ol data-start=\"2183\" data-end=\"3393\"><li data-start=\"2183\" data-end=\"2439\"><p data-start=\"2186\" data-end=\"2232\"><strong data-start=\"2186\" data-end=\"2230\">Soil identification and classification<\/strong><\/p><ul data-start=\"2236\" data-end=\"2439\"><li data-start=\"2236\" data-end=\"2439\"><p data-start=\"2238\" data-end=\"2439\">Humidity, densities, <strong data-start=\"2259\" data-end=\"2276\">granulometry<\/strong> y <strong data-start=\"2279\" data-end=\"2303\">Atterberg limits<\/strong> (key to evaluate behavior, plasticity and clogging potential in certain scenarios).<\/p><\/li><\/ul><\/li><li data-start=\"2441\" data-end=\"2769\"><p data-start=\"2444\" data-end=\"2478\"><strong data-start=\"2444\" data-end=\"2476\">Strength and deformability<\/strong><\/p><ul data-start=\"2482\" data-end=\"2769\"><li data-start=\"2482\" data-end=\"2671\"><p data-start=\"2484\" data-end=\"2671\">In soils: simple compression and\/or <strong data-start=\"2517\" data-end=\"2531\">triaxial<\/strong> (UU\/CU\/CD as required), and <strong data-start=\"2562\" data-end=\"2574\">oedometer<\/strong> for consolidation\/deformability if seating is a concern.<\/p><\/li><li data-start=\"2675\" data-end=\"2769\"><p data-start=\"2677\" data-end=\"2769\">In rock: <strong data-start=\"2686\" data-end=\"2693\">UCS<\/strong> (simple compression), point load and geomechanical characterization if applicable.<\/p><\/li><\/ul><\/li><li data-start=\"2771\" data-end=\"2978\"><p data-start=\"2774\" data-end=\"2831\"><strong data-start=\"2774\" data-end=\"2829\">Laboratory permeability (when relevant)<\/strong><\/p><ul data-start=\"2835\" data-end=\"2978\"><li data-start=\"2835\" data-end=\"2978\"><p data-start=\"2837\" data-end=\"2978\">Tests to estimate permeability coefficient and support the choice of method and water control.<\/p><\/li><\/ul><\/li><li data-start=\"2980\" data-end=\"3198\"><p data-start=\"2983\" data-end=\"3059\"><strong data-start=\"2983\" data-end=\"3057\">Abrasiveness and wear (especially in rock or granulars with quartz)<\/strong><\/p><ul data-start=\"3063\" data-end=\"3198\"><li data-start=\"3063\" data-end=\"3198\"><p data-start=\"3065\" data-end=\"3198\">Abrasiveness tests (e.g. Cerchar\/LCPC or others depending on the program) to anticipate tool consumption, performance and costs.<\/p><\/li><\/ul><\/li><li data-start=\"3200\" data-end=\"3393\"><p data-start=\"3203\" data-end=\"3272\"><strong data-start=\"3203\" data-end=\"3270\">Soil and water chemistry (durability and compatibilities)<\/strong><\/p><ul data-start=\"3276\" data-end=\"3393\"><li data-start=\"3276\" data-end=\"3393\"><p data-start=\"3278\" data-end=\"3393\">pH, sulfates, chlorides, chemical aggressiveness: useful for concrete durability, corrosion and water\/sludge management.<\/p><\/li><\/ul><\/li><\/ol><h2 data-start=\"3395\" data-end=\"3457\">To bid with less uncertainty (what \u201cpays better\u201d)<\/h2><ul data-start=\"3458\" data-end=\"4484\"><li data-start=\"3458\" data-end=\"3843\"><p data-start=\"3460\" data-end=\"3843\">A geotechnical and hydrogeological model that allows to choose method with criteria (EPB\/hydro-shield\/open) and to size wells and thrusts; this fits with <strong data-start=\"3611\" data-end=\"3689\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/choice-of-tunnel-boring-machine\/\" target=\"_new\" rel=\"noopener\" data-start=\"3613\" data-end=\"3687\">Choice of tunnel boring machine<\/a><\/strong> and the approach of <strong data-start=\"3706\" data-end=\"3802\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/technical-assistance-and-engineering\/\" target=\"_new\" rel=\"noopener\" data-start=\"3708\" data-end=\"3800\">Technical assistance and engineering<\/a><\/strong>.<\/p><\/li><li data-start=\"3844\" data-end=\"4201\"><p data-start=\"3846\" data-end=\"4201\">Prepare the bid\/RFQ with the minimum essential information (including geotechnical and water): <strong data-start=\"3945\" data-end=\"4160\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/what-information-must-be-included-in-an-rfq-request-for-quotation-in-order-for-eurohinca-to-evaluate-a-crossing-or-an-emissary\/\" target=\"_new\" rel=\"noopener\" data-start=\"3947\" data-end=\"4158\">What information should an RFQ include to value a crossing or outfall?<\/a><\/strong>.<\/p><\/li><li data-start=\"4202\" data-end=\"4484\"><p data-start=\"4204\" data-end=\"4484\">If you want to focus the campaign on typical risks by terrain: <strong data-start=\"4266\" data-end=\"4443\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/which-geotechnical-hazards-are-most-likely-to-be-encountered-by-type-of-terrain-and-how-to-mitigate-them-effectively\/\" target=\"_new\" rel=\"noopener\" data-start=\"4268\" data-end=\"4441\">Geotechnical hazards by soil type and mitigation<\/a><\/strong>.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Antes de licitar una hinca de tuber\u00eda (microt\u00fanel), lo m\u00e1s rentable es invertir en una campa\u00f1a previa que reduzca incertidumbre en: tipo de terreno, permeabilidad\/nivel fre\u00e1tico, resistencia-deformabilidad, abrasividad y riesgos de frente. Con esos datos se puede afinar la selecci\u00f3n de equipo, el dise\u00f1o de pozos y el reparto de riesgos en la oferta. Ensayos [&hellip;]<\/p>\n","protected":false},"author":80,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[146],"tags":[],"class_list":["post-5091","post","type-post","status-publish","format-standard","hentry","category-preguntas-frecuentes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ensayos para licitar hinca de tuber\u00eda | Eurohinca<\/title>\n<meta name=\"description\" content=\"Ensayos de campo y laboratorio antes de licitar una hinca: sondeos, CPTu, piez\u00f3metros, permeabilidad, resistencia, consolidaci\u00f3n y abrasividad.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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