Lecture 2 - ARCH 106 Materials of Construc6on...

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Unformatted text preview: ARCH 106 Materials of Construc6on Founda6on Last Week’s Quiz: Who is the customer? A commiFee of local people Why was the material selected? Local material, support idea of the bath being carved out of the ground How was the material standardized? Package height of 3 layers = 15 cm What is the structural material? Reinforced Concrete 1/8/2010 ARCH 106 Lecture 01 2 Today’s Agenda •  •  •  •  •  Essence of Lecture 01 in a Nutshell Lecture about Excava6on and Retaining Concepts Short Video Founda6ons Short Quiz 1/8/2010 ARCH 106 Lecture 01 3 Materials of Construc6on (Lect.01) •  Selec6on of Materials –  Who are the par6cipants in the decision process –  What are the reasons for material selec6ons –  How do material affect the quality of the product –  What is the impact on the life cycle of the building •  Selec6on of Methods of Construc2on –  Who are the par6cipants in the decision process –  What are the reasons for construc6on methods –  How do construc6on affect building quality 1/8/2010 ARCH 106 Lecture 01 4 Decision Par6cipants (Lect.01) •  •  •  •  Owner Architect Engineer Construc6on Professional O A E C 1/8/2010 ARCH 106 Lecture 01 5 Decision Parameters •  •  •  •  •  Desired Quality (Appearance, Texture) Required Property (Construc6on, Technical Features) Budget (Construc6on and Opera6on) Time Sustainability ( page 4  ­ 5 of last week’s reading) 1/8/2010 ARCH 106 Lecture 01 6 Decision Parameters of Par6cipants Par6cipant Parameters Owner Architect Engineer Construc6on 1/8/2010 ARCH 106 Lecture 01 7 Excava6on and Founda6on •  •  •  •  •  Desired Quality (Appearance, Texture) Required Property (Construc6on, Technical Features) Budget (Construc6on) Time Sustainability 1/8/2010 ARCH 106 Lecture 01 8 Excava6on •  Sloped or benched excava6on is less expensive than sheeted excava6on, but requires a site without nearby property lines, adjacent structures, or other limits on excava6on. 1/8/2010 ARCH 106 Lecture 01 9 Types of Retaining Walls (1) Steel Soldier Pile and Lagging •  oldest forms of retaining system Steps •  Construc6ng soldier piles at regular intervals (6 e to 12 e) •  Excava6ng in small stages and installing lagging. •  Backfilling and compac6ng the void space behind the lagging. 1/8/2010 ARCH 106 Lecture 01 10 Types of Retaining Walls (2) Sheet Pile Walls •  Driving (or vibra6ng) individual sheet piles to the desired depth. •  Second sheet pile interlocks with first pile 1/8/2010 ARCH 106 Lecture 01 11 Types of Retaining Walls (3) Secant Pile Wall •  intersec6ng reinforced concrete piles •  Primary piles •  Secondary piles •  Pile overlap 3 inches Tangent Pile Wall •  No overlap 1/8/2010 ARCH 106 Lecture 01 12 Types of Retaining Walls (4) Slurry Wall •  Trenching under slurry, •  End stop inserted (steel tube or other), •  Reinforcement cage lowered into the slurry ­ filled trench •  Concre6ng 1/8/2010 ARCH 106 Lecture 01 13 Retaining Wall Tieback •  Hole drilled •  Bar placed in hole; •  Concrete poured for anchor; •  Wall connec6on made •  Repeat for next 6eback layer 1/8/2010 ARCH 106 Lecture 01 14 Drill Rig 1/8/2010 ARCH 106 Lecture 01 15 Tieback Waler 1/8/2010 ARCH 106 Lecture 01 16 Dewatering •  Simple: pump water from pits (sumps) in the excava6on •  Higher volumes of water: use well points or barrier wall 1/8/2010 ARCH 106 Lecture 01 17 Dewatering System Elements •  Well Points •  Header Pipe •  Dewatering Pump 1/8/2010 ARCH 106 Lecture 01 18 Excava6on and Retaining Short Video •  Retaining concept for the World Trade Center 1rst Quiz Ques6on: •  Which par6cular site condi6ons had to be considered for the selec6on of the retaining system? 1/8/2010 ARCH 106 Lecture 01 19 Building Founda6on •  To transmit all building load to the ground •  To limit seFlement and prevent subsidence •  To provide a level bed on which to build •  To anchor the structure to the ground 1/8/2010 ARCH 106 Lecture 01 20 Building Founda6on •  Three parameters define the founda6on: –  Quality of the Ground –  Load of the Building –  Structure of the Building 1/8/2010 ARCH 106 Lecture 01 21 Assessing Quality of the Ground •  Subsurface explora6on (drilling) •  Surface explora6on (pressure tes6ng) Desired results of the assessment: •  Type of soil (proper6es) •  Allowable founda6on pressure •  Stability of the soil •  Level of water table •  Contamina6on, Objects 1/8/2010 ARCH 106 Lecture 01 22 Types of Founda6on (1) Shallow Founda6on •  Baring capability of the soil good and consistent •  Building load moderate 1/8/2010 ARCH 106 Lecture 01 23 Types of Founda6on (2) Deep Founda6on •  Where the soils directly below the building substructure are weak or unstable, deep founda6ons transmit building loads to deeper, more competent, soils. 1/8/2010 ARCH 106 Lecture 01 24 Types of Founda6on (3) Floa6ng Founda6on •  Balances the weight of soil removed with the weight of building to be constructed •  The load on the remaining soil is liFle changed. 1/8/2010 ARCH 106 Lecture 01 25 Reading Assignment: Chapter 2 Page 29  ­ 80 •  •  •  •  •  Founda6ons Excava6on Retaining Concepts Dewatering Drainage 1/8/2010 ARCH 106 Lecture 01 26 Last Week’s Field Trip 1/8/2010 ARCH 106 Lecture 01 27 Wall Foo6ng 1/8/2010 ARCH 106 Lecture 01 28 Column foo6ng 1/8/2010 ARCH 106 Lecture 01 29 Quiz Ques6ons •  Which par6cular site condi6on had to be considered for the selec6on of the retaining system at the World Trade Center? •  Please name at least one other system that would have sa6sfied the requirement. •  What type of founda6on has the construc6on site adjacent to the CM building? 1/8/2010 ARCH 106 Lecture 01 30 ...
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