Week 2
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Week 2

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Week 2 Week 2 Presentation Transcript

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  • 15 minute breakout 1. What are the 2 basic different types of foundations? When would we use one versus the other? 2. In each of the two types – what are the subtypes and when would you use them?
    • Shallow and deep foundations
    • Shallow – soil directly below walls and columns bear the weight of the building. Cheaper. Ideal for high water table and relatively light building.
    • Deep – Soil conditions directly below the building not suitable therefore structure required to reach deeper to appropriate soil conditions.
  • Shallow – Types. A. Slab on grade – high water table – common in BA B. Crawl Space – common for wood frame – access to utilities C. Basement – Storage and utilities
    • Slab on grade- assembly
    • Trench for utilities
    • Trench for footings
    • Rebar in footings
    • Pour footings
    • Waterproof membrane
    • Sand
    • Reinforcing for slab
    • Concrete slab pour
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    • Footings for crawl spaces and basements.
    • spread the force of the vertical loads of columns and walls over more soil area
    • Spread footing
    • Column footing
    • Concrete footings and foundations
    • Foundations poured separately from vertical carrying structure.
    • Waterproofing issues
    • Drain the water –remove pressure on walls
    • Keep water out of the building
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    • Deep foundations – Pile driving
    • Reach down to bedrock for poor soil conditions
    • Pile caps/ grade beams support columns and walls
    • Concrete slab
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    • Deep foundations –
    • Mat slabs, Excavation and retaining walls
    • Mat slab – very think slab (6’) with a lot of steel reinforcing that replaces individual column footings
    • Excavation sequence
    • 1. Drive soldier beams – steel into ground
    • 2. Place wood lagging between beams as you excavate down to retain soil
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    • Below grade foundation walls and waterproofing
    • Protection board
    • Waterproof membrane
    • Concrete retaining wall
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