A non-structural steel special inspection final report-2015

Home Browse Search

Kraus-Anderson Constructionl Company Project B14-05902 March 18, 2015 Page 2 I Summary of Special Inspections and Material Observations and Tests Soil Evaluation and Testing A Geotechnical Evaluation was not performed for the project. Braun Intertec technicians performed shallow hand augers borings that upon review indicate the soils were capable of supporting the presumptive bearing pressures that the structural engineer used for project design.The evaluation we perFormed does not constitute a Geotechnical Evaluation,and because of the limited extents of our evaluation,greater risks remain,which are assumed by the owner. Soils exposed at structure subgrade elevations and in excavations were visually evaluated,while those below subgrade elevations and excavation bottoms were evaluated using hand auger borings.This task was perFormed to determine if the observed and tested soils were would be able to support the structural design loads structural engineer used in their calculations. Hand auger probes were conducted over the course of multiple days to confirm the consistency of soils for the building pad.Soils at the bottom of all excavations were visually evaluated and determined consist of gray sandy lean clay. The hand auger borings were drilled with a 1 1/2-inch-diameter hand auger.The borings were advanced in 2-to 4-inch increments to depths of 2 to 4 feet below subgrade elevations or excavation bottoms.The auger was then withdrawn from the borehole to obtain cuttings.The soils encountered in the borings were classified in general accordance with ASTM D 2488, "Description and Identification of Soils (Visual/Manual Procedures)." Preliminary estimates of soil consistency and density were also evaluated based on resistance to penetration of the hand auger,and the turning resistance. Soils at the bottom of the excavations appeared to be suitable for the bearing capacity of 2000 pounds per square foot, used by the structural engineer. Fill was placed above the bottom of the excavations to bring the bearing elevation back to footing grade. From time to time,compaction tests failed. Failed tests were retested for compaction after the contractor compacted the soils again.All fill placed was compacted to project specifications. Concrete Reinforcement We initially reviewed the reinforcement and dowel requirements on the project structural drawings and shop drawings, if available. Information reviewed included bar size, bar length, bar spacing, bar location, splice lengths and dowel placement.This information was then used to determine if the inplace reinforcement was placed in accordance with the requirements of the project plans and specifications. We also noted if the inplace reinforcement was free of rust, scale and soil. Concrete Ptacement Observations Concrete placement observations were performed to monitor the procedures being used by the contractor and to determine if they were consistent with typical industry standards and the pnoject specifications. e�au� INT,ERTEC