How to make a grain discharge structure technically feasible project that seemed unfeasible?
Learn how ENEC Engenharia faced this challenge and the solutions we have created to carry out the work.
This is the first article in a series of success stories that we will post on our blog.
At the end of this article, you can download the file with more photos of the project.
Facing a part of a larger project, a deep pit, where would be installed equipment for receiving and vertical grain transport, with numerous structural interferences with existing foundations and structures to implement it, ENEC faced a great challenge: to propose alternative to make feasible technically the execution of this pit.
ABOUT THE PROJECT
We were hired by a multinational in the area of production of soybean seeds for the construction of a complex of receiving, processing, treatment and storage of seeds in Catalão-GO (Brazil).
Grain Discharge Structure
The initial projects, according to contract, were provided by our client.
During the progress of the works, we received the projects pertinent to the area of receiving and vertical transport of the grains (Moegas) to the silos.
They were basically reinforced concrete structures made up of retaining walls / floor slabs, buried at depths of up to 6.0 m, where they would receive the metal grates to pass the loaded trucks and also accommodate the equipment (hoppers / conveyors / elevators etc.) to transport the beans.
The projects received by us adopted as premise conventional concrete structures (form / steel / concrete) for the walls of restraints and for slabs (both floor and bottom). They also adopted prefabricated deep-pile foundations for the region’s roofing pillars. These should extend over the entire depth of the pit so that there would be no interference of the foundation blocks in the internal area of the pit.
For the execution of this gap, according to the conventional process adopted by the projects provided by the client, it would be necessary to excavate large proportions since the depth reached 6.0 m. It should also, for safety reasons, adopt slopes with gentle slopes to avoid landslides and advance of the area to be excavated well beyond the projection of the moat.
Due to this large excavation, the foundations for the new metallic roof structure become quite difficult. This is because it would occur in blocks on precast piles below the pit level,
Another major problem would be the imminent compromise of the stability of the foundations of the shed already executed (including with metallic structure of the shed) in the projection of where this excavation would be necessary. That is: Execution as designed besides having a high degree of difficulty could also cause instability of the existing adjacent foundations.
HOW ENEC HELPED
After evaluating the projects provided to us we decided to propose changes to make feasible the execution of the services. We take as a solution to adopt the crimping of metallic profiles, in such a way spaced, that they would work as foundations, containment of the excavations and part of the structure.
In addition, in addition to the new concept, we also innovate by adopting an inverted execution system: After drilling the profiles, we excavate only a third of the depth of the pit, which is necessary to allow the concreting of part of the containment curtain and the beams and top slabs.
The concreting of these parts in advance should aim to “lock” the tops of the crimped metal profiles and allow the excavation of the remainder of the pit depth without the need for staples / rods for intermediate anchoring of the metal profiles. We used the openings in the slabs, already planned in projects, to descend excavation equipment. And also for the withdrawal of land originated by the excavations
With the change of the projects, we managed to make feasible the execution of the gap by keeping the deadline and costs initially foreseen.
baixe o Case Completo
DOWNLOAD THE FULL CASE IN PDF
We prepared a complete case with many more photos during the execution of the Grain Discharge Structure project. Download it so you can access offline whenever you need it.