Loading...
HomeMy WebLinkAboutStaff Report 4.A 03/18/2019 Late Doc 1Auger Cost Column TM & Drill Displacement Overview Auger Cast Column" and Drill Displacement Column" (ACC and DDC) are deep, partial and full displacement, well-defined, pressure grout, ground improvement methods. ACC/DDC are used to improve any soft/loose soil or contaminated soil. The ACC/DDC process constructs strong, engineered, "composite ground" for the support of foundations and slabs. DDC uses a displacement drill to compact soil in the ground, resulting in higher capacity and lower spoils. For DDC, large cavity expansion in the displaced soil produces the increased strength and ground improvement. ACC/DDC strengths are enhanced by the pressure grout effect during construction. ACC/DDC increases bearing capacity, increases soil stiffness, reduces soil compressibility, increases soil resistance to liquefaction, and increases composite soil shear strength. ACC/DDC construction produces low noise and no vibration. ACC/DDC composite ground supports heavy loads on conventional foundations, slabs, and mats with uniform and reduced settlement. 02017 Farrell Design -Build Inc. Go Vertical with Confidence, Auger Cast Column, and Drill Displacement Column are the trademarks of Farrell Design -Build Inc. Go Vertical with Confidence' Geologic Hazard Key Advantages Application High stiffness & High capacity - Type 2 A Soft/Loose Soil No vibration 4,1, Liquefaction Low spoil - DDC Contaminated Soil Uplift -tension hold-down Zk Lateral Spread Well defined concrete/ grout column ®Slope Stability Liquefaction mitigation Diameter/Depth Key Considerations 14,16,18, 24 in dia Impermeable 10 — 80 ft deep Rigid inclusion Gravel cushion Compatible Soils Grout with low spoil Contaminated Soil - Doc Concrete cleanup Sand (SP, SM, SC) Flat stable pad Silt (ML, MH) Clay (CL, CH) Comparable To Undocumented Fill Rigid inclusions Concrete piers Bearing Capacity Range Driven piles 4,000 —14,000 psf Geopier° Soil mix columns ACC/DDC Applications Support foundations, structural mats, slabs, embankments, MSE walls, and industrial foundations. The ideal applications for ACC/DDC: 1) Deep, soft and loose soil sites and bay mud/sensitive soil sites. 2) Compressible soil sites. 3) Contaminated soil and undocumented debris fill sites. 4) Groundwater protection regions. S) Sensitive sites with vibration concerns near critical structures. 6) Sites near occupied buildings and in dense urban areas. L DESIGN -BUILD Go Vertical with O Auger Cost Column' & ACC' Drill Displacement 4 -Step Construction Process ACC. 00C ACC DDC 1 -1,- 1 t STEP 1 ! 1 STEP 2 STEP 3 STEP 4 I _ _ Heavy crowd+ withdraw = Install aggregate Finished high torque auger & pump cushion over ACC/DDC = drill displace concrete under `' ACC/DDC to with ground to the design depth. Improve = pressure, Improve soil _ k ,= minimize punching shear improvement and footing .- soil by cavity by pressure '_ and decouple and/or slab expansion effect. grout effect. -,�; _ ;�., seismic forces. above. Technical Details Auger Cost Column" and Drill Displacement Column' (ACC/DOC) methods are innovative upgrades to rigid inclusion ground improvement for foundation support. With on expanded base, ACC/DDC achieve higher bearing capacity than other rigid inclusions. ACC use partial displacement, continuous flight augers in dense soil regions. DDC use a full displacement tool that is shaped to laterally displace and compact the adjacent soil into the ground, forming strong, "composite ground." The displacement tool and the pressure grout effect result in a coarse sided sand -cement column with finished diameters greater than 100% of neat tool diameter. The soil displacement produces cavity expansion effects that 1) increase shear strength, 2) increase density, 3) increase over -consolidation, 4) reduce void ratio, and 5) increase stiffness of the composite ground. The physical benefits of ACC/DDC construction result in reliable, deep, high capacity, ground improvement columns. Type 1 ACC/DDC include engineered grout. Type 2 ACC/DDC include reborfor ductility, higher strength, and to resist tension forces. ACC/DDC use a gravel cushion to reduce and distribute punching shear and to decouple foundation lateral forces. Gravel cushion thickness is 12 to 24 -inches. Full-scale load tests to 200% confirm the design bearing capacity. In some cases, cone penetration tests confirm density of composite ground between groups of ACC/DDC. Farrell uses heavy, fixed most, piling drill rigs to install ACC/DDC. Farrell operates Leibherr, Cosagronde, and Bauer rigs. These rigs install ACC/DDC to ••• depths of 10 to 80 feet. Farrell installs ACC/DDC with tool diameters of 14,16, 18, and 24 -inches. The rigs are equipped with electronic monitoring to record drill torque, drill depth, drill speed, grout pump pressures, and grout volume. ACC/DDC are strong, well-defined, pressure grout, ground improvement systems that support your project to Go Vertical with Confidence' 02017 Farrell Design -Build Inc. Go Vertical with Confidence, Auger Cast Column, and Drill Displacement Column are the trademarks o/Farrell Design -Build Inc. SACRAMENTO 530.621.4867 IRVINE 949.428.9596 uc 4.77361 A+B farrellinc.com The Pierce San Jose, CA "I was pleased with the Farrell crew. They were great to work with. Ken Winters managed his crew and equipment well. I look forward to more work with Farrell." Gary Cunnington Superintendent Clark Builders FARRELL DESIGN -BUILD t� o � o � 0 fro ru in C al m p col (C tj (9,- col] , A, M_ C p-11 r , ) U_- I Co I �a -2 LWW1dEFq'1nM5 Overview Compacted Soil Column and Compacted Aggregate Pier (CSG and CAP) are soil -replacement, ground improvement methods. CSC/CAP are like rammed piers, aggregate piers, sand piers, and compacted soil/soil-cement columns. CSC/CAP improve soft clays and silts, loose sands, undocumented fills, and compressible soil. The CSC/CAP process constructs strong, engineered, "composite ground" for the support of foundations and slabs. CSC/CAP improve the ground by vertical and horizontal compaction of lifts of select material like crushed rock, sand, recycled material, and soil -cement mixes. Compressible soil is drilled out and replaced with the select material that is rammed into dense compacted lifts that expand the drilled cavity. The ramming of the select material creates a cavity expansion effect that increases soil strength and stiffness, resulting in higher bearing capacity and reduced soil compressibility. CSC/CAP provide strong, composite ground to support conventional foundations, slabs, and mots with reduced settlement. © 2017Forrell Design -Build Inc. Go Vertical with Confidence Is the trademark of Forrell Design -Build Inc. Go Vertical with Confidence' Geologic Hazard Key Advantages Application Cost effective support A Soft/Loose Soil Readily available material - CAP ® Slope Stability LEED opportunity Contaminated Soil Re -use onsite soil - CSC High bearing capacity Diameter/Depth Uplift -tension hold-down 18, 24, 30 in dia 6 — 32 ft deep Key Considerations Vibration system Compatible Soils Requires confinement Silt (ML, MH) in liquefiable layers Clay (CL, CH) Spoil haul -off - CAP Clayey Sand (SC) Semi-rigid inclusion Silty Sand (SM) Casing Undocumented Fill Moderate depth limit Bearing Capacity Range Comparable To 4,000 — 9,000 psf Overex/replace Concrete piers Driven piles Geopier° Soil mix columns CSC/CAP Applications Support foundations, structural mats, slabs, embankments, tanks, MSE walls, and industrial equipment. The ideal applications for CSC/CAP: 1) Soft clay, silty clay, silty and sandy clay, and loose soil sites. Z) Compressible soil sites. 3) Undocumented fill sites. 4) Gain LEED° points at sites with local and recycled concrete. S) Sites where drilled holes will stand open during construction. 6) Sites near occupied buildings and in dense urban areas. CARRELL DESIGN -BUILD Compacted Aggregate Ner 4 -Step Construction Process STEP 1 Drill hole to remove soft clay, loose sand, or undocumented fill. Technical Details STEP 2 Load material to thin lifts & ram to ram bottom bulb. CSC/CAP Compact rack/sail to 1 dia. below improvement at bottom. improvement= ; edge & form "` Go Vertical with Confidence' 1 STEP 3 STEP 4 Load material in Finished eAv thin lifts & ram to CSC/CAP install ground and ground improvement at improvement= ; edge & form "` with footing ;a ? CSC/CAP. v� and/orslab above. Compacted Soil Column and Compacted Aggregate Pleb (CSS and CAP) provide excellent ground improvement support of foundations and slabs. The CSC/CAP process uses rammed and compacted select material in a drilled hole to form strong, engineered, "composite ground." Select materials include crushed rock, sand, recycled material, and engineered soil -cement mixes. The CSC/CAP compaction process is applied to each lift of select material. The compaction force causes the select material to compact and to press laterally into a drilled hole; resulting in a coorse=sided CSC/CAP with a finish diameter greater than the drill diameter. CSC/CAP produces cavity expansion effects on the adjacent soil that 1) increase lateral confining pressure, 2) increase shear strength, 3) increase over -consolidation ratio, 4) reduce void ratio, and 5) increase soil stiffness. As CSC/CAP composite ground is loaded, high friction forces at the edges resist load and transfer the footing stress out and lower into the soil profile. A CSC/CAP is akin to a stiff spring that is confined in a soft spring medium (the native soil), where the stiff spring will attract more load and resist compression by virtue of the very dense lifts of compacted select material. Most CSC/CAP are 5 to 25 feet deep and occupy between 5% to 25% of the footing bottom. CSC/CAP installed with local and recycled materials qualify for sustainability and LEEDO points. CSC/CAP can be equipped with steel anchors to resist net tension forces. Full-scale load tests to 200% confirm the design bearing capacity on all projects. Farrell uses excavators with hydraulic hammer attachments to install CSC/CAP. The hamming tool is designed to compact an 18 to 24 -inch thick lift of select material. CSC/CAP diameters are 18, 24, and 30 -inches. CSC/CAP are cost effective, settlement control, ground improvement systems that support your project to Go Vertical with Confidence' 02017 Farrell Design -Build Inc. Go Vertical with Confidence Is the trademark of Forrell Design -Build Inc. SACRAMENTO 530.621.4867 IRVINE 949.428.9596 LIC 477361 A+B forrellinc.com Testim,onial mn UC Davis Brewery/Winery and Food Pilot Facility Davis, CA "The recycled concrete content in the system really made this a double win as we soved money for the project instead of using concrete drilled piers and we enhanced sustainability for the project." John Westphal, SE KPW Structural 01 A rARRELL DESIGN -BUILD