Geral, Lift

Lifting and crimping of metal liners completed

A striking feature of port works is the large amount of lifting, from the infrastructure to the last fender.

Added to the scenario are tidal conditions (or level), current, wind, waves, vessels and cranes, requiring different design, planning and execution.

CHALLENGES
🔸 Additional environmental loads: sea current, river current, tide or level variation, waves;
🔸 On-board cranes: accurate assessment of stability and position maintenance required;
🔸 Dynamic loads due to waves both in the air and when entering the water (splash zone)
🔸 Verticalization of liners with a single crane: requires a special procedure and containment cradle for safe lifting
🔸 Correct positioning of the stakes: constant control of the topography during lifting;
🔸 Access to liners for concreting: use of platforms and means of access without the need to lift people;

SOLUTIONS
🔸 Stability study for all equipment
🔸 Rigging plans for all lifts
🔸 Planning in advance
🔸 Relationship between designer, rental company, assembler, inspection and end customer
🔸 Adaptation of the project to local availability of equipment

SCOPE OF TechCon Engineering and Consulting
🔸 General lifting consultancy for the owner
🔸 3D rigging plans for the owner
🔸 Field lifting safety consultancy
🔸 Review of rigging plans issued by the contractor.

Hoisting of Precast Structures for Port Works – Lifting of Capitals

LOAD: CAPITEL
🔸 Structural element supported on the stake to allow support from other parts, such as blocks and beams;
🔸 Temporary, removed after execution, or fixed, incorporated into the final structure (case of this project);
🔸 Made from steel or reinforced concrete (case of this project);
🔸 When made of steel, they are welded to the piles after driving, or fixed with clamps;
🔸 When in concrete, they are supported by metal brackets on steel piles or clamps on concrete piles;
🔸 Light weight compared to other pre-molded products.

LIFTING
🔸 Use of a raft to move the precast to its initial position;
🔸 Performed by the same pile driving equipment, on its own raft, being able to tilt the boom up to the radius of the final position;
🔸 The ferry moves using a system of winches, cables, lifts and “irons”, with millimeter precision (in the case of sheltered waters);

SCOPE OF TechCon
🔸 General lifting and precast consultancy for the owner
🔸 3D rigging plans for the owner
🔸 Lifting safety field consultancy

Hoisting of “U” Beams

LOAD: “U” beam
🔸 Longitudinal structural element supported directly on the capitals;
🔸 “U” section, made of concrete, with reinforcement to resist lifting and concreting efforts;
🔸 After assembly, additional reinforcement is incorporated to give the beam final strength;
🔸 The longitudinal reinforcement is continuous, resulting in a hyperstatic beam, also continuous;
🔸 The final section is rectangular, made up of the pre-molded “U” plus the part molded on site;
🔸 Heaviest piece of all, weighing 40 tons and 17 meters long.

LIFTING
🔸 The pre-molded comes from the plant in a trailer, later transported by ferry until close to the final position;
🔸 The crane lifts the part onto the trailer and moves to the lifting position smoothly, thanks to the anchoring system;
🔸 After initial positioning, the radius is increased, the boom is lowered and the blocks with the load are lowered to the final position, on the capitals;
🔸 Guide cables controlled by winches keep the load controlled during the ferry’s movement.

SCOPE OF TechCon
🔸 General lifting and precast consultancy for the owner;
🔸 3D rigging plans for the owner;
🔸 Safety consultancy in field lifting.

Lifting of Precast Elements for Port Works.

Lifting of “V” Beams

LOAD: “V” Beam

🔸 Structural bracing element supported directly on the capitals; “U” shaped, made of concrete, reinforced to withstand lifting and concreting forces;

🔸 The final section is rectangular, composed of the precast “U” plus the on-site molded part;

🔸 Concreted on a large service barge, eliminating the boarding step;

🔸 Weight: 29 tons.

LIFTING

🔸 The barge containing the precast elements approaches the crane barge, which lifts the piece to be assembled;

🔸 The crane barge, with the lifted and secured piece using guide cables on winches, moves smoothly to the lifting position, thanks to the anchoring system;

🔸 After the initial positioning, the radius is increased, lowering the boom and lowering the block with the load to the final position, over the capitals;

🔸 Lifted by 6 handles, it required a structural analysis to verify the distribution of forces at the lifting points. In this case, done by finite element analysis.