Geotechnical studies and structural design are essential for safe lifting operations.
Foundation project for soil replacement and fill.
Foundation project for soil replacement and fill.
GUIDELINES
🔸 The rigger defines the matting layout and the forces acting on the mats.
🔸 The SPT (Standard Penetration Test) should be conducted as close as possible to the matting location, preferably under the most heavily loaded outrigger or track.
🔸 If the crane is mobile, the entire movement area should be considered in the soil investigation.
🔸 The borehole should reach the depth defined by the geotechnical engineer, based on the outrigger load and the anticipated mat width.
🔸 Boreholes should never end in a soft or weakening layer, and may be supplemented by Light Dynamic Penetrometer (PDM) testing or plate load tests.
🔸 The presence of underground or partially buried structures such as boxes, ducts, galleries, wells, cisterns, etc., must be reported to the geotechnical engineer.
🔸 Based on the soil investigation, the geotechnical engineer calculates the allowable bearing pressure for matting (Padm) and may recommend additional measures such as fill, soil improvement, or replacement.
🔸 Based on the Padm, the rigger defines the required mat area and calculates its structural strength.
🔸 If timber sleepers are used as mats, they must be designed according to NBR 7190 and NBR 7511.
🔸 If steel mats are used, they must be designed according to NBR 8800 or other applicable steel structure standards.
SCOPE of TechCon Engenharia e Consultoria
🔸 Geotechnical foundation design and structural design of mats for 350 t and 120 t lattice boom cranes, and 200 t telescopic crane.
🔸 Structural design for the protection of electrical enclosures.
When soft soil is present, requiring oversized mats or causing prohibitive settlements (sinking), the following solutions may be adopted:
🔸Soil treatment
🔸Soil replacement
🔸Raft foundation (concrete slab)
🔸Piling
