Gestão de obra em terreno com elevado nível do lençol freático

Abstract

The content set out in this report was produced over the course of six months as part of the Project and Site Supervision team (responsible for drawing up the project, contract management and supervision) for the construction of a fuel station in the Costa do Sol district, Avenida Major General Cândido Mondlane, Maputo city. The report covers the different methods to be adopted in the process of investigating the ground with a water table, identifying the characteristics of the soils and the precautions to be taken in choosing and defining the design of the foundations as well as the materials that may make up the structural elements. Techniques to be adopted to reduce water in the soil to allow the work to be carried out are indicated, as are the processes for improving the foundation base, taking into account the size of the infrastructure to be built. A brief description is also given of the essential activities carried out before the actual work begins, such as the licensing and project approval phase for a fuel filling station. The trainee was assigned to the work in question as resident inspector, with responsibility for managing the contract and the work without neglecting quality aspects and deadlines. He was responsible for reporting all the contractor's concerns to the owner and vice versa, scheduling and communicating the likely dates for the subcontractors to enter the site, coordinating and organizing meetings, checking and approving the work carried out by the contractor and subcontractors, and issuing the measurement records for processing payments. ENGEN (the owner of the project) has fuel stations built and in operation in all of our country's provinces and the project in question was one of the atypical projects because it took place on land with a high water table. The initially planned project did not contain technical construction solutions that suited the conditions of the land, and the presence of the water table severely hampered the excavations for the installation of the tanks and foundations, as well as the soil improvement work. After two months of stoppage, which significantly affected the deadline for the work, the revised project was issued and approved with an appropriate solution for the environment, which consisted of installing a groundwater drainage system in the existing ditch in front of the site and improving the resistant capacity of the soil by applying rock material wrapped in a geotextile blanket (TRADUÇAO NOSSA)