Soil-Structure Interaction Seminar - Foundation Performance ...

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FOUNDATION REPAIR TECHNIQUES PAGE 7 OF 7 PIPE TRENCHES 20) Pipe trenches have traditionally been installed using bank sand as the backfill material. Sand is dumped into the open trench and water-compacted to achieve the necessary Proctor density. Sometimes these same pipe trenches become a channel for transmitting excessive water into the interior of the building, and heaving of the clay soils and cracking of the interior finish materials may result. Although seldom addressed by structural engineers, care should be taken to specify that the· ends of pipe trenches be sealed off at the perimeter of the foundations. Suggested corrections to existing problems of this type include: water barriers, clay fill, French drains, polyurethane injection or other methods. CHECKING TENDON STRESSES 21) How do we know if post-tensioned tendons have been stressed? A clue to stressing not having been done is an unusually high incidence of shrinkage cracks, especially on the sides of the exterior grade beams. Chipping out at least two live end anchorages on each side and inspecting the shims, one can see if they are properly seated or not. If it is not clear whether or not they are, then the tendons should be tensioned to 25 to 50% of the maximum design stress using a calibrated hydraulic ram jack. If the shims do become not unseated, it may be assumed that at least a percentage of the design tensile force is present. We do not recommend that the full design force be applied, since should the gripping shims slip, the cable end may end up several inches inside the grade beam and very costly structural repairs would then be required. SOIL STABILIZATION 22) Available soil stabilization methods for existing buildings: a) Condor SS injection (an ionization treatment for clays) b) Lime injection c) Water barriers d) Polyurethane injection e) Improved moisture control using deep sump pumps f) Barriers at pipe trench entrances to foundation system g) "Leaky pipe" systems ------------- end ------------- -·
A P P E N D I X- DRAWINGS SAMPLE FOUNDATION PROBLEMS & CORRECTION TECHNIQUES SK-1, 2 & 3 Plumbing line leak - claim accepted . SK-4 Normal center lift- condominium SK-5,6 & 7 Edge lift requiring leveling piers and polyurethane injection-- SK-8 Extreme tilting SK-9 & 10 Localized drilled footing failure SK-11 Plumbing leak - claim denied SK-12 French drain and polyethylene moisture barrier SK-13 MIRAFI impervious moisture barrier SK-14 Concrete leveling pier SK-15 Concrete pressed pile SK-16 Description- Penna-jack system SK-17 View - Penna-jack system SK-18 Detail - steel pipe piling SK-19 Helical anchors SK-20 URETEK (polyurethane injection) method SK-21 HYDROPIER method- (modified "leaky pipe")
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SOIL STRUCTURE INTERACTION SEMINA
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FOUNDATION FAILURE DEFINED IN TERMS
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FOUNDATION FAILURE DEFINED IN TERMS
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FOUNDATION FAILURE IN THE HOUSTON A
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FOUNDATION FAILURES IN THE HOUSTON
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Inspections of the foundation had b
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J CASE NO. 10 - THE USE OF SPREAD F
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GARAGE 0" ·-0.2" -0.8 11 -0.3" •
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V) IJ.J u
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• +0.3" +0.5" • 0 10 I SCALE IN
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CURRENT PRACTICES FOR DESIGN OF TRA
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INTRODUCTION CURRENT PRACTICES FOR
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and rigidity to control, dissipate
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4.0 DESIGN PARAMETERS 4.1 General T
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I I. I I APPENDIX B TYPICAL GENERAL
Page 66: FUTURE OF POST-TENSIONED SLABS ON G
Page 72 and 73: GUIDLINES FOR GEOTECHNICAL DESIGN,
Page 74 and 75: GEOTECHNICAL GUIDELINES FOR DESIGN,
Page 76 and 77: INTRODUCTION The variable subsoil c
Page 78 and 79: South, Southwest, Southeast, and pa
Page 81 and 82: Geotechnical Foundation Design Crit
Page 83 and 84: Foundation Design Considerations In
Page 85 and 86: Vegetation Control We recommend tre
Page 87 and 88: 8. The subgrade and fill moisture c
Page 89 and 90: Concrete Placement Monitoring The c
Page 91 and 92: Area drains can be used around the
Page 93 and 94: Inspections Every homeowner should
Page 95 and 96: Moisture Barriers Moisture barriers
Page 97: RECOMMENDED QUALITY CONTROL AND INS
Page 108 and 109: FOUNDATION REPAIR TECHNIQUES FOR RE
Page 110 and 111: PROFESSIONAL RESUME of DONALD E. LE
Page 112 and 113: FOUNDATION REPAIR TECHNIQUES PAGE 1
Page 115: FOUNDATION REPAIR TECHNIQUES PAGE40
Page 138 and 139: EXAMPLE OF HELICAL ANCHORS Pipe Typ
Page 141: RESIDENTIAL SOIL AND FOUNDATION REQ
Page 148 and 149: Section 6-52. Exceptions CITY OF WE
Page 151 and 152: Soil Structure Interaction Seminar
Page 153 and 154: July 21, 1994 Page3 corporation, as
Page 156 and 157: Residential Construction Liability
Page 158 and 159: July 21, 1994 Page 8 E. Defenses to
Page 161 and 162: The Texas Deceptive Trade Practices
Page 163 and 164: construction or design of the house
Page 165: (5) Arguably, implied warranties do
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(3) Includes any diminution in mark
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D. Who Is a Proper Plaintiff? 1. An
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a. claimant's damages are limited t
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a. May be based on hearsay (i.e., e
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d. The Broker (1) Absent specific a
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VI. More Honored in the Breach HORA
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