{"id":3968,"date":"2025-05-12T12:18:53","date_gmt":"2025-05-12T12:18:53","guid":{"rendered":"https:\/\/eurohinca.com\/?p=3968"},"modified":"2025-05-12T12:22:23","modified_gmt":"2025-05-12T12:22:23","slug":"how-the-closed-shield-machinery-is-used-in-subway-construction","status":"publish","type":"post","link":"https:\/\/eurohinca.com\/en\/como-se-emplea-la-maquinaria-de-escudo-cerrado-en-la-construccion-subterranea\/","title":{"rendered":"How is closed shield machinery used in subway construction?"},"content":{"rendered":"
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The closed shields<\/strong> -EPB<\/a> <\/strong>o hydro shield<\/a><\/strong>- allow to excavate soft and saturated soils while keeping the face stabilized by pressure. Their work cycle combines excavation, immediate support and controlled evacuation of the material to advance safely under cities, rivers or coastal areas.<\/p>

Assembly and launching<\/h2>

The TBM is assembled in an attack shaft or initial cavern. Once the starting zone is sealed, the cylinders push the shield against a reaction wall while the cutter wheel is activated.<\/p>

2. Excavation and pressure balance<\/h2>

In EPB the chamber is filled with conditioned soil (foam \/ polymer); in hydro-shielding, bentonite sludge is used. The internal pressure is adjusted to equalize soil and water pressure, avoiding subsidence or swelling.<\/p>

3. Material extraction<\/h2>
  • EPB:<\/strong> auger doses the excavated \"paste\" towards the outlet.<\/li>
  • Hydroshield:<\/strong> pumps send the suspension to the separation plant to recover bentonite and evacuate detritus.<\/li><\/ul>

    4. Laying of voussoirs<\/h2>

    As the wheel advances, an erector installs a ring of concrete segments that forms the final lining of the tunnel. This takes place inside the shield, safe from outside pressure.<\/p>

    5. Glue injection and sealing<\/h2>

    Cement or bentonite grout is pumped into the annular space between segments and soil, sealing seepage and preventing surface settlement.<\/p>

    6. Sludge transport and management<\/h2>

    The dewatered detritus (EPB) or the separated suspension (hydroshield) is loaded onto belts or trucks for recycling or authorized deposit, minimizing the environmental impact.<\/p>

    7. Monitoring and guidance<\/h2>

    Pressure, torque and thrust sensors send real-time data to the cab. A laser-inertial system maintains alignment with millimeter accuracy, ensuring that the tunnel meets the design grade.<\/p>

    Result:<\/strong> the closed shield combines pressurized excavation, immediate support and slurry management to advance safely, cleanly and in a controlled manner in environments where other methods would be unfeasible.<\/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":"

    Los escudos cerrados \u2014EPB o hidroescudo\u2014 permiten excavar suelos blandos y saturados manteniendo el frente estabilizado por presi\u00f3n. Su ciclo de trabajo combina excavaci\u00f3n, soporte inmediato y evacuaci\u00f3n controlada del material para avanzar con seguridad bajo ciudades, r\u00edos o zonas costeras. 1. Montaje y lanzamiento La tuneladora se ensambla en un pozo de ataque o […]<\/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-3968","post","type-post","status-publish","format-standard","hentry","category-preguntas-frecuentes"],"yoast_head":"\nUso de escudo cerrado en construcci\u00f3n subterr\u00e1nea<\/title>\n<meta name=\"description\" content=\"Proceso de excavaci\u00f3n presurizada: montaje, equilibrio de presiones, colocaci\u00f3n de dovelas y gesti\u00f3n de lodos con tuneladoras EPB e hidroescudo.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/eurohinca.com\/en\/how-the-closed-shield-machinery-is-used-in-subway-construction\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" 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