African Meetinghouse “ACCESSING...
Transcript of African Meetinghouse “ACCESSING...
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GEOTECHNICALCONSULTANTS, INC
Richard Pizzi, P.E.
“ACCESSING HISTORY”
Special Thanks toRick Wilhelmsen
African Meetinghouse
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SOIL NAIL WALL CONSTRUCTION
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SOIL NAIL WALL CONSTRUCTION
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SOIL NAIL WALL CONSTRUCTION
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SOIL NAIL WALL CONSTRUCTION
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NAIL INDIRECTLY LOADED IN TENSION ACROSS BOUNDARY.
CRITCIAL SHEAR PLANE.
SOIL NAIL WALL CONSTRUCTION
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SECTION ELEVATION
NAIL LENGTH ~ 15’ ea.12 NAILS x 15’ = 180’ OF DRILLING
OR A NAIL DENSITY OF ~ 10’ OF DRILLING PER L.F. OF WALL
FOR WALL HEIGHT ~ 20
HEIGHT, H~20’
NAIL LENGTH~ 75% - 80% X H
6' c.c.
TRIBUTARY AREA ~ 30 S.F. / NAIL
WALL LENGTH ~18’12 NAILS
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GEOTECHNICALCONSULTANTS, INC
Richard Pizzi, P.E.
“ACCESSING HISTORY”
Special Thanks toRick Wilhelmsen
African Meetinghouse
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ConnorDanDavidRich
TomChris
PaulMikeLarry
GEOTECHNICALCONSULTANTS, INC
End 1
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African Meetinghouse8 Smith Court Boston
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Built in 1806
Oldest Black ChurchStill Standing in the United States
(Cost $7,500)
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2006 Restored to 1855 Appearance
(Completed 2012)
Cost $9.5 Million
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Frederick Douglass• Escaped Slave• Leader in Abolitionist Movement• Dazzling Orator – 1860 Speech
End 2
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• Deep Foundation Elements
• Structural Elements
• Installed by Drilling (usually)
• Small Diameter (<= 12‐inch Diameter)
• Directly Loaded
• Load Applied Near Ground Surface
• Penetrate Weak Strata
• Transfer Load to (deep) Bearing Strata
MICROPILES TYPE 1 (>99%)
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• Sand• Sand & Gravel• Glacial Till• Stiff/Hard Clay• Bedrock
• Urban Fill• Organic Soil• Peat• Very loose Sand• Soft Silt or Clay
BEARING STRATA
WEAK STRATA
MICROPILE INSTALLATION
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• Sand• Sand & Gravel• Glacial Till• Stiff/Hard Clay• Bedrock
• Urban Fill• Organic Soil• Peat• Very loose Sand• Soft Silt or Clay
BEARING STRATA
WEAK STRATA
MICROPILE INSTALLATION
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• Sand• Sand & Gravel• Glacial Till• Stiff/Hard Clay• Bedrock
• Urban Fill• Organic Soil• Peat• Very loose Sand• Soft Silt or Clay
BEARING STRATA
WEAK STRATA
MICROPILE INSTALLATIONADD GROUT
PLACECORE
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CASED SECT
ION
UNCA
SED SECT
ION
a.k.a
BOND LEN
GTH • Sand
• Sand & Gravel• Glacial Till• Stiff/Hard Clay• Bedrock
• Urban Fill• Organic Soil• Peat• Very loose Sand• Soft Silt or Clay
BEARING STRATA
WEAK STRATA
MICROPILE INSTALLATION
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CASED SECT
ION
UNCA
SED SECT
ION
a.k.a
BOND LEN
GTH • Sand
• Sand & Gravel• Glacial Till• Stiff/Hard Clay• Bedrock
• Urban Fill• Organic Soil• Peat• Very loose Sand• Soft Silt or Clay
BEARING STRATA
WEAK STRATA
MICROPILE INSTALLATION
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→ Casing + Core + Grout
→ Core + Grout
UNCASED SECTION
CASED SECTION
CASED SECT
ION
UNCA
SED SECT
ION
a.k.a
BOND LEN
GTH
CORE
CASING
GROUT
CORE
GROUT
MICROPILE DESIGN
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→ Casing + Core + Grout
→ Core + Grout
UNCASED SECTION
CASED SECTION
CASED SECT
ION
UNCA
SED SECT
ION
a.k.a
BOND LEN
GTH
CORE
CASING
GROUT
CORE
GROUT
MICROPILE DESIGN
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BondLengthUNCASED SECTION
CASED SECTION
PA F
PA F
: → Casing + Core + Grout
: → Core + Grout
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CASED SECTION
X
→ Casing + Core + Grout
→ Core + Grout
X
UNCASED SECTIONBondLength
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0.33 ′ 0.4 core)
UNCASED (a.k.a BOND LENGTH or EMBEDMENT LENGTH)
CASED SECTION
CODE BASED DESIGN – Most are ASD
0.33 ′ 0.4 core)
is the smaller of : 0.4
0.4
30,000
Massachusetts State and New York City Codes0.33
1,600
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0.4 0.47 core)
0.4 0.47 core)
UNCASED LENGTH
CASED SECTION
FHWA – Micropile Design and Construction Reference Manual ( Also ASD)
is the smaller of :
87,000(Strain Compatibility)
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φ 0.85φ[ 0.85 ′ core)]
φ 0.85φ 0.85 ′ core)]
UNCASED LENGTH
CASED SECTION
AASHTO – Design Specifications (LRFD)
is the smaller of :
87,000
Φ = 0.7forcompression
End 3
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GEOTECHNICALCONSULTANTS, INC
Richard Pizzi, P.E.
“ACCESSING HISTORY”
Special Thanks toRick Wilhelmsen
African Meetinghouse
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Reticulate / Reticulated ?
Adjective ‐ Re∙tic∙u∙late [Ri‐tik‐yuh‐lit]
1. Netted; Covered With a Network. 2. Netlike.
Verb ‐ Re∙tic∙u∙lat∙ed [Ri‐tik‐yuh‐leyt](Used with an object)
3. To Form Into a Network.
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Pali Radicé [Italian trans. “Root Piles”]
Reticulated Root Piles : a network of micropiles
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NETWORKED MICROPILES: TYPE 2 (<1%)(Reticulated Root Piles)
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Column Cross Section
Elevation View
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~20 ft.
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SECTION ELEVATION
NAIL LENGTH ~ 15’ ea.12 NAILS x 15’ = 180’ OF DRILLING
OR A NAIL DENSITY OF ~ 10’ OF DRILLING PER LF. OF WALL
FOR HEIGHT ~ 20
HEIGHT, H
NAIL LENGTH~ 75% - 80% X H
6.0' C.C.
TRIBUTARY AREA ~ 30 S.F. / NAIL
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A‐Ro
w
Layout Plan Reticulated Pile Wall
B‐Ro
w
C‐Ro
w
D‐Ro
w
~21 ft. Lon
g
PILE LENGTH ~ 25’ ea.42 PILES x 25’ = 1050’ OF DRILLINGPILE DENSITY ~ 50’ OF DRILLING PER L.F. OF WALL
NAIL LENGTH ~ 15’ ea.12 NAILS x 15’ = 180’ OF DRILLINGNAIL DENSITY: ~ 10’ DRILLING PER L.F. OF WALL
20 ‘ HIGH SOIL NAIL WALL
End 4
20 ‘ HIGH RETICULATE PILE WALL
~20 ft.
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2006 Restored to 1855 Appearance
(Completed 2012)
Cost $9.5 Million
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End 5
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End 5
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GEOTECHNICALCONSULTANTS, INC
Richard Pizzi, P.E.
“ACCESSING HISTORY”
Special Thanks toRick Wilhelmsen
African Meetinghouse
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End 6
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African Meetinghouse8 Smith Court Boston
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End 7
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• DESIGN BASED ON PREVIOUS PROJECTS
• PILE DENSITY TOO GREAT‐TOO COSTLY
• NO ACCEPTED DESIGN METHOD
• NO STANDARDS OF ANY KIND
• 3‐D FINITE ELEMENT ANALYSIS???
FUTURE OF TYPE 2 NETWORKED MICROPILES??(Reticulated Root Piles)
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GEOTECHNICALCONSULTANTS, INC
Richard Pizzi, P.E.
“ACCESSING HISTORY”
Special Thanks toRick Wilhelmsen
African Meetinghouse