# DIRT DWELLING. and your. Pin Foundations Inc., 2008

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1 DIRT and your DWELLING 2008 Pin Foundations Inc., 2008

2 If we accept that preserving soil in its native condition is necessary, then how do we build? Utilities? Roads? Foundations?

3 Typical Strip, Transfer, and Pound

4 FOUNDATION BEST FIXES?

5 DRAINAGE Think in Plan Build in Section BUILD ABOVE - BEARING?

6 Minimal Footprint / Vertical Piling / Screw Anchors / Heavy Equipment/ Site Pours/ Carbon Release Courtesy Anderson Anderson Architecture

7 WALL SYSTEMS Skills, Pours, Pins, and Impacts

8 Flow Control Credits No step forming Model as pasture on existing soil if roof runoff is dispersed on the up gradient side of structure according to BMP T5.10 (best flow control credit for low impact foundations). lid foundations

9 Flow Control Credits Step forming Use equation below to determine what portion of roof can be modeled as pasture on existing soil: A 1 [dc(0.5)/dp] x A 1 = A 2 A 1 = roof area draining to up gradient dc = depth of cuts into soil profile dp = permeable depth of soil (A horizon + some B horizon) A 2 = roof area modeled as pasture on existing soil lid foundations

10 Subtracted Solution Reduced Mass Diamond Pier

11 DP STRUCTURES

12 PIER TECHNIQUES

13 INSTALLATION Two or Three Person Crew Minutes per Pier No Excavation / No Heavy Equipment No Site Repair

14 Picking the Right Hammer

15 Phi Angle, Unit Weight, Cohesive Strength PIN FOUNDATIONS INC. Calculation Software for Pin Foundation System PROJECT INFORMATION: Project Name: CENTEX HOMES Product: L.I.F.T. Location: Auburn, WA Engineer: TAN Date: 8/16/04 SOIL INFORMATION: Soil 1 - Thickness (ft), D1:1.50 Soil 2 Description: Organic Silts and Clayey Silts Silty Sands Phi (degree): Unit Weight (pcf): Cohesion (psf): Ground Water Table: At Grade Neglected Depth (ft): 0.50 PILE INFORMATION: Pile Type: Inboard (2 pins) Pin Length (ft): 5.25 Angle (degree): Pin Diameter (in): Wall Thickness (in): Pin Type and Grade: Pipe, 36ksi Effective Depth (ft), D: 3.04 Effective Length (ft), B: 5.95 Effective Pile Width (ft): 0.54 PILE CAPACITY: Compression: C_ultim (kip)= F.S.=2: C_allow (kip)= 7.08 Uplift: U_ultim (kip)= 1.40 F.S.=1.5: U_allow (kip)= 0.93 Lateral: Parallel to Pins: L1_allow (kip)= 0.78 Perpendicular to Pins: L2_allow (kip)= 1.00 Program automatically corrects Dry Unit Weight for Buoyant Weight when Ground Water Table "At Grade" is indicated. Program corrects total Pin length indicated for actual active length. All capacities are calculated separately. CALCULATION DATA: Bearing Capacity Factors: Nc=27.16 Nq=14.25 Nr=10.75 Pressure at Base (psf)= Arching Factor=2.75 Allowable Deflection (in)=0.5 Allowable Bending Stength (ksi)=24 Soil 1 D1 Soil 2 Neglected Depth B PIN FOUNDATIONS INC V4.0 Software Developed by CivilTech Software, Bellevue,WA,USA 1. Four (4) Pins of equal length per pier. Pin length includes that portion embedded in the pier.

16 Structural Limits Concrete Head DP Pounds

17 SUBMITTALS

18 PERFORMANCE Durability Frost Soil Heave Corrosion Protection Burial Line Salt Spray Corrosion Test - PSI

19 TESTING

20 QUALITY Testing Consistency Curing Labeling

22 COST Soil Type House Size Load Paths LID Credits Development Savings Pier Installation 100/200

23 Speed of Construction

24 How Little Can We Do?

### 5/1/2013. Topics. The challenge is to better maintain native characteristics of soils during and after construction

PIN Foundations Topics Applications Design and Construction Flow Control Credits www.pinfoundations.com Copyright 2008, Pin Foundations, Inc. Curtis Hinman WSU Extension Faculty, Watershed Ecologist chinman@wsu.edu

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