The maximum diameter of a microtunnel is established after a technical analysis that evaluates several key factors:
Soil conditions
The soil or rock composition, hardness and stability directly influence the possible size. At Eurohinca we carry out detailed geotechnical studies prior to each construction site, as described in our page on what is microtunneling and its main applications?.Machinery capacity
The TBM must be adapted to the projected diameter. An example is the use of the Hydroshield DN1200 in the microtunnel in curve at El Arenao, where high-precision drilling was carried out in complex geological conditions.Tunnel length and trajectory
Long routes or those with reduced radii of curvature, such as that of the El Arenao project, may limit the technically feasible diameter.Purpose of the tunnel
The size is adapted to the intended use, whether it is for efficient catchments and returns for aquaculture, The following are some of the most important projects in the area.Accessibility and logistics
The space available for the wellbore and receiver, as well as the logistical conditions of the site, influence the maximum operating diameter.Regulations and technical standards
In addition to complying with national regulations, international guidelines are applied, such as those published by the International Society for Trenchless Technology (ISTT), a world leader in trenchless technologies.
At Eurohinca We combine experience, precision engineering and state-of-the-art technology to determine the optimum diameter of each microtunnel, guaranteeing safety and efficiency in every project.
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