{"id":4702,"date":"2025-11-04T09:33:36","date_gmt":"2025-11-04T09:33:36","guid":{"rendered":"https:\/\/eurohinca.com\/?p=4702"},"modified":"2026-05-13T10:49:10","modified_gmt":"2026-05-13T10:49:10","slug":"how-to-dimension-attack-and-reception-wells","status":"publish","type":"post","link":"https:\/\/eurohinca.com\/en\/como-dimensionar-los-pozos-de-ataque-y-recepcion\/","title":{"rendered":"How to dimension the attack and reception shafts: admissible thrust, hoisting and site logistics?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"4702\" class=\"elementor elementor-4702\" 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=\"101\" data-end=\"467\">The well is sized for <strong data-start=\"144\" data-end=\"164\">to house the equipment<\/strong>, <strong data-start=\"166\" data-end=\"204\">to reliably transmit the thrust<\/strong> y <strong data-start=\"207\" data-end=\"229\">operate smoothly<\/strong> (assembly, lifting, detritus\/sludge management and access). In projects of <strong data-start=\"301\" data-end=\"382\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/pipe-jacking-2\/\" target=\"_new\" rel=\"noopener\" data-start=\"303\" data-end=\"380\">pipe jacking (microtunneling)<\/a><\/strong>, The design of wells conditions the viability and performance from the first meter.<\/p><h4 data-start=\"469\" data-end=\"510\">1) Allowable thrust (attack shaft)<\/h4><ul data-start=\"511\" data-end=\"1155\"><li data-start=\"511\" data-end=\"792\"><p data-start=\"513\" data-end=\"792\"><strong data-start=\"513\" data-end=\"539\">Design thrust (Ed):<\/strong><br data-start=\"539\" data-end=\"542\" \/>Ed \u2248 <strong data-start=\"549\" data-end=\"561\">F_front<\/strong> (excavation pressure \u00d7 area) + <strong data-start=\"595\" data-end=\"609\">F_friction<\/strong> (\u03c4 perimetral \u00d7 contact surface) + <strong data-start=\"652\" data-end=\"664\">losses<\/strong> (curvature, joints, local friction). As an early guide, \u03c4 can be estimated between <strong data-start=\"751\" data-end=\"763\">5-20 kPa<\/strong> according to soil and lubrication.<\/p><\/li><li data-start=\"793\" data-end=\"921\"><p data-start=\"795\" data-end=\"921\"><strong data-start=\"795\" data-end=\"820\">Well resistance:<\/strong> thrust rings\/crown, <strong data-start=\"847\" data-end=\"860\">screens<\/strong> y <strong data-start=\"863\" data-end=\"880\">bottom slab<\/strong> must resist <strong data-start=\"896\" data-end=\"906\">Ed \u00d7 \u03b3<\/strong> (\u03b3 1.3-1.5).<\/p><\/li><li data-start=\"922\" data-end=\"1050\"><p data-start=\"924\" data-end=\"1050\"><strong data-start=\"924\" data-end=\"943\">Useful geometry:<\/strong> width = <strong data-start=\"952\" data-end=\"971\">TBM + 1.0-1.5 m<\/strong> per side; length = <strong data-start=\"993\" data-end=\"1021\">push frame (6-10 m)<\/strong> + mounting area (\u2265 6 m).<\/p><\/li><li data-start=\"1051\" data-end=\"1155\"><p data-start=\"1053\" data-end=\"1155\"><strong data-start=\"1053\" data-end=\"1080\">Hydraulic stability:<\/strong> check <strong data-start=\"1091\" data-end=\"1104\">flotation<\/strong>, <strong data-start=\"1106\" data-end=\"1122\">siphoning<\/strong> y <strong data-start=\"1125\" data-end=\"1142\">punching<\/strong> with high NF.<\/p><\/li><\/ul><p data-start=\"1157\" data-end=\"1296\">For the construction detail of the pit and shoring, you can enlarge at <strong data-start=\"1229\" data-end=\"1295\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/vertical-wells\/\" target=\"_new\" rel=\"noopener\" data-start=\"1231\" data-end=\"1293\">Vertical wells<\/a><\/strong>.<\/p><h4 data-start=\"1298\" data-end=\"1323\">2) Lifting and maneuvering<\/h4><ul data-start=\"1324\" data-end=\"1695\"><li data-start=\"1324\" data-end=\"1418\"><p data-start=\"1326\" data-end=\"1418\"><strong data-start=\"1326\" data-end=\"1349\">Lifting load (Q):<\/strong> TBM + trolleys + pipe sections + tools (consider sludge\/water).<\/p><\/li><li data-start=\"1419\" data-end=\"1582\"><p data-start=\"1421\" data-end=\"1582\"><strong data-start=\"1421\" data-end=\"1455\">Certified equipment and points:<\/strong> beams, eyebolts, slings (coef. \u2265 7) and <strong data-start=\"1496\" data-end=\"1512\">clear height<\/strong> sufficient for vertical descents without interfering with crowning.<\/p><\/li><li data-start=\"1583\" data-end=\"1695\"><p data-start=\"1585\" data-end=\"1695\"><strong data-start=\"1585\" data-end=\"1602\">Wellhead:<\/strong> hoisting light <strong data-start=\"1617\" data-end=\"1640\">major components<\/strong> y <strong data-start=\"1643\" data-end=\"1664\">pipe sections<\/strong> repetitive with safe guidance.<\/p><\/li><\/ul><h4 data-start=\"1697\" data-end=\"1742\">3) Site logistics (flow and safety)<\/h4><ul data-start=\"1743\" data-end=\"2249\"><li data-start=\"1743\" data-end=\"1870\"><p data-start=\"1745\" data-end=\"1870\"><strong data-start=\"1745\" data-end=\"1757\">Access:<\/strong> turning radii, truck bed and <strong data-start=\"1799\" data-end=\"1823\">functional separation<\/strong> (sludge plant, energy, pipe stockpiling).<\/p><\/li><li data-start=\"1871\" data-end=\"1996\"><p data-start=\"1873\" data-end=\"1996\"><strong data-start=\"1873\" data-end=\"1903\">Sludge\/detritus management:<\/strong> decanting, <strong data-start=\"1917\" data-end=\"1934\">recirculation<\/strong> or transport; watertight wall bushings; <strong data-start=\"1969\" data-end=\"1979\">bypass<\/strong> emergency.<\/p><\/li><li data-start=\"1997\" data-end=\"2121\"><p data-start=\"1999\" data-end=\"2121\"><strong data-start=\"1999\" data-end=\"2024\">Ancillary services:<\/strong> installed power (peaks of <strong data-start=\"2054\" data-end=\"2073\">pushing and pumping<\/strong>), process water, ventilation and lighting.<\/p><\/li><li data-start=\"2122\" data-end=\"2249\"><p data-start=\"2124\" data-end=\"2249\"><strong data-start=\"2124\" data-end=\"2132\">HSE:<\/strong> handrails, lifelines, <strong data-start=\"2162\" data-end=\"2187\">confined atmospheres<\/strong>, plan, plan for <strong data-start=\"2197\" data-end=\"2217\">vertical rescue<\/strong> and of <strong data-start=\"2223\" data-end=\"2248\">hydraulic emergency<\/strong>.<\/p><\/li><\/ul><h4 data-start=\"2251\" data-end=\"2326\">4) Quick sizing rules (indicative; validate in engineering)<\/h4><div class=\"_tableContainer_1rjym_1\"><div class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"2327\" data-end=\"2891\"><thead data-start=\"2327\" data-end=\"2384\"><tr data-start=\"2327\" data-end=\"2384\"><th data-start=\"2327\" data-end=\"2338\" data-col-size=\"sm\">Variable<\/th><th data-start=\"2338\" data-end=\"2363\" data-col-size=\"md\">Attack well (MT\/DP)<\/th><th data-start=\"2363\" data-end=\"2384\" data-col-size=\"md\">Reception well<\/th><\/tr><\/thead><tbody data-start=\"2399\" data-end=\"2891\"><tr data-start=\"2399\" data-end=\"2478\"><td data-start=\"2399\" data-end=\"2425\" data-col-size=\"sm\"><strong data-start=\"2401\" data-end=\"2424\">Useful width\/diameter<\/strong><\/td><td data-start=\"2425\" data-end=\"2456\" data-col-size=\"md\"><strong data-start=\"2427\" data-end=\"2446\">TBM + 1.0-1.5 m<\/strong> per side<\/td><td data-start=\"2456\" data-end=\"2478\" data-col-size=\"md\"><strong data-start=\"2458\" data-end=\"2476\">DN + 0.6-1.0 m<\/strong><\/td><\/tr><tr data-start=\"2479\" data-end=\"2608\"><td data-start=\"2479\" data-end=\"2499\" data-col-size=\"sm\"><strong data-start=\"2481\" data-end=\"2498\">Useful length<\/strong><\/td><td data-start=\"2499\" data-end=\"2555\" data-col-size=\"md\"><strong data-start=\"2501\" data-end=\"2527\">Push frame 6-10 m<\/strong> + <strong data-start=\"2530\" data-end=\"2554\">reinforcement zone \u2265 6 m<\/strong><\/td><td data-start=\"2555\" data-end=\"2608\" data-col-size=\"md\">Safe receiving area + protective screen<\/td><\/tr><tr data-start=\"2609\" data-end=\"2703\"><td data-start=\"2609\" data-end=\"2629\" data-col-size=\"sm\"><strong data-start=\"2611\" data-end=\"2628\">Bottom level<\/strong><\/td><td data-start=\"2629\" data-end=\"2663\" data-col-size=\"md\">\u2265 <strong data-start=\"2633\" data-end=\"2651\">drive axle elevation<\/strong> - clearances<\/td><td data-start=\"2663\" data-end=\"2703\" data-col-size=\"md\">\u2265 axle height with receiving berm<\/td><\/tr><tr data-start=\"2704\" data-end=\"2790\"><td data-start=\"2704\" data-end=\"2727\" data-col-size=\"sm\"><strong data-start=\"2706\" data-end=\"2726\">Permissible thrust<\/strong><\/td><td data-start=\"2727\" data-end=\"2754\" data-col-size=\"md\">\u2265 <strong data-start=\"2731\" data-end=\"2741\">Ed \u00d7 \u03b3<\/strong> (\u03b3 1.3-1.5)<\/td><td data-start=\"2754\" data-end=\"2790\" data-col-size=\"md\">Impact resistance\/reception<\/td><\/tr><tr data-start=\"2791\" data-end=\"2891\"><td data-start=\"2791\" data-end=\"2810\" data-col-size=\"sm\"><strong data-start=\"2793\" data-end=\"2809\">Clearance height<\/strong><\/td><td data-start=\"2810\" data-end=\"2852\" data-col-size=\"md\">Hook travel for <strong data-start=\"2837\" data-end=\"2851\">Q for lifting<\/strong><\/td><td data-start=\"2852\" data-end=\"2891\" data-col-size=\"md\">Removal of elements and safety<\/td><\/tr><\/tbody><\/table><\/div><\/div><blockquote data-start=\"2893\" data-end=\"3005\"><p data-start=\"2895\" data-end=\"3005\">The values depend on <strong data-start=\"2919\" data-end=\"2934\">DN, L, Rmin<\/strong>, geotechnics, <strong data-start=\"2947\" data-end=\"2953\">NF<\/strong>, The following information, method (microtunnel\/Direct Pipe), equipment and specifications are available.<\/p><\/blockquote><h4 data-start=\"3007\" data-end=\"3044\">5) Three reference scenarios<\/h4><ol data-start=\"3045\" data-end=\"3542\"><li data-start=\"3045\" data-end=\"3216\"><p data-start=\"3048\" data-end=\"3216\"><strong data-start=\"3048\" data-end=\"3095\">Urban, DN 1200, L 180 m, saturated sands:<\/strong> Rectangular well shored with anti-flange slab; <strong data-start=\"3143\" data-end=\"3149\">Ed<\/strong> high (front pressure + friction); dedicated sludge plant.<\/p><\/li><li data-start=\"3217\" data-end=\"3388\"><p data-start=\"3220\" data-end=\"3388\"><strong data-start=\"3220\" data-end=\"3277\">Crossing under highway, DN 600, L 90 m, silt with gravel:<\/strong> prefabricated circular shaft; moderate thrust; priority to <strong data-start=\"3335\" data-end=\"3354\">maneuverability<\/strong> e <strong data-start=\"3357\" data-end=\"3366\">hoisting<\/strong> frequent use of tubes.<\/p><\/li><li data-start=\"3389\" data-end=\"3542\"><p data-start=\"3392\" data-end=\"3542\"><strong data-start=\"3392\" data-end=\"3440\">Large DN 2200, L 240 m, competent clays:<\/strong> wide and short well for assembly; <strong data-start=\"3474\" data-end=\"3504\">reinforced lifting points<\/strong> and crowning suitable for heavy cranes.<\/p><\/li><\/ol><h4 data-start=\"3544\" data-end=\"3581\">6) Minimum documentation required<\/h4><ul data-start=\"3582\" data-end=\"4021\"><li data-start=\"3582\" data-end=\"3696\"><p data-start=\"3584\" data-end=\"3696\"><strong data-start=\"3584\" data-end=\"3605\">Thrust calculation<\/strong> (front + friction + losses) and <strong data-start=\"3639\" data-end=\"3667\">structural verification<\/strong> of rings\/screens\/slab.<\/p><\/li><li data-start=\"3697\" data-end=\"3777\"><p data-start=\"3699\" data-end=\"3777\"><strong data-start=\"3699\" data-end=\"3716\">Lifting plan<\/strong> (load matrix, radios, crane, certified accessories).<\/p><\/li><li data-start=\"3778\" data-end=\"3865\"><p data-start=\"3780\" data-end=\"3865\"><strong data-start=\"3780\" data-end=\"3800\">Logistics Layout<\/strong> (access, sludge plant, energy, ventilation, lighting).<\/p><\/li><li data-start=\"3866\" data-end=\"3947\"><p data-start=\"3868\" data-end=\"3947\"><strong data-start=\"3868\" data-end=\"3880\">HSE Plan<\/strong> (confinement, rescue, siphoning, falls to different levels).<\/p><\/li><li data-start=\"3948\" data-end=\"4021\"><p data-start=\"3950\" data-end=\"4021\"><strong data-start=\"3950\" data-end=\"3962\">As-built<\/strong> of wells and <strong data-start=\"3974\" data-end=\"3990\">certificates<\/strong> of tests\/lifting elements.<\/p><\/li><\/ul><p data-start=\"4023\" data-end=\"4200\">For normative criteria and European best practices for driving and related techniques, it is useful to consult the <a href=\"https:\/\/en.dwa.de\/\"><strong data-start=\"4121\" data-end=\"4178\">guide DWA-A 125E (Pipe Jacking and Related Techniques)<\/strong><\/a><\/p><p data-start=\"4202\" data-end=\"4577\">If you prefer a joint revision of your design, our team of <strong data-start=\"4269\" data-end=\"4365\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/technical-assistance-and-engineering\/\" target=\"_new\" rel=\"noopener\" data-start=\"4271\" data-end=\"4363\">Technical assistance and engineering<\/a><\/strong> can propose the dimensioning of the well and the <strong data-start=\"4411\" data-end=\"4421\">layout<\/strong> if you already have a baseline data, you can <strong data-start=\"4463\" data-end=\"4533\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/request-offer\/\" target=\"_new\" rel=\"noopener\" data-start=\"4465\" data-end=\"4531\">request a quotation<\/a><\/strong> with the layout, geotechnics and DN\/L foreseen.<\/p>\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>El pozo se dimensiona para alojar el equipo, transmitir con seguridad el empuje y operar con fluidez (montaje, izado, gesti\u00f3n de detritus\/lodos y accesos). En proyectos de hinca de tuber\u00eda (microt\u00fanel), el dise\u00f1o de pozos condiciona la viabilidad y el rendimiento desde el primer metro. 1) Empuje admisible (pozo de ataque) Empuje de dise\u00f1o (Ed):Ed [&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-4702","post","type-post","status-publish","format-standard","hentry","category-preguntas-frecuentes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pozos de ataque y recepci\u00f3n: empuje, izado y log\u00edstica<\/title>\n<meta name=\"description\" content=\"C\u00f3mo dimensionar pozos de ataque y recepci\u00f3n en obras sin zanja: di\u00e1metro, profundidad, empuje, equipos, seguridad y espacio de maniobra.\" \/>\n<meta name=\"robots\" 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