3A-3 Construction Of Uncased Drilled Shafts Klein Etc.ppt
5/5/2017 Influence of the Construction of Uncased Drilled Shafts at Close Proximity of MSE Wall Facing Presented by: Willie Liew, P.E., Tensar International Presentation Outline Review Standard of Practice of Pile / Drilled Shaft Installation at MSE Walls Overview and Construction of Test Wall Project – Uncased Drilled Shafts Close to Wall Face Detailing around MSE Modular Block Wall Observations and Measurements 1
5/5/2017 Deep Foundation Installation Standard of Practice Typical construction technique Preinstall the pilling or sleeves to drive piles through and then construct the wall by placing reinforcement and fill around the piles / sleeves Deep Foundation Installation Standard of Practice FHWA Guidelines Driven piles X 1.5ft Drilled shaft X 3ft 2
5/5/2017 Deep Foundation Installation Standard of Practice Cut around geogrid reinforcement Skew geogrid reinforcement around piles / shaft Uncased Drilled Shafts close to MSE Wall Face After Wall Construction Advantages Speed of wall construction – fill and reinforcement around piles / sleeves Proper compaction around the piles / sleeve Eliminate controls and construction techniques to hold sleeves in a vertical position during fill placement and compaction 3
5/5/2017 Uncased Drilled Shafts close to MSE Wall Face After Wall Construction Questions / Concerns Can bore holes for drilled shafts be effectively drilled through the geogrid reinforced wall Does drilling operations cause excessive rotation or lateral movement of the wall face How are layers of geogrid reinforcement affected by the drilling operations Investigate / verify through test wall – Drilling 18” from the back of wall face and 8ft deep Overview and Test Wall Construction Leveling Pad Construction 4
5/5/2017 Overview and Test Wall Construction Install blocks and backfill Overview and Test Wall Construction Detailing at block face 5
5/5/2017 Overview and Test Wall Construction Geogrid Placement & Backfill Overview and Test Wall Construction 6
5/5/2017 Overview and Test Wall Construction Drilling Operation Detailing at Modular Block Face Bore Hole Location Face Block Treatment Geogrid Details 1 Core fill, #3 horizontal rebar in all block courses. Masonry glue on top 5 block courses Geogrid Precut around drilled shaft Grout, #3 horizontal and vertical rebar on all block courses Core fill and #3 horizontal rebar in all block courses except grout and #3 horizontal rebar on top 5 courses. Geogrid Precut around drilled shaft 2 3 Geogrid Precut around drilled shaft 4 Core fill and #3 horizontal rebar in all block courses except grout and #3 horizontal rebar on top 5 courses. Geogrid Precut around drilled shaft 5 Core fill, #3 horizontal rebar in all block courses. Masonry glue on top 5 block courses Geogrid Precut around drilled shaft 6 Core fill and #3 horizontal rebar in all block courses except grout and #3 horizontal rebar on top 5 courses. No Geogrid Precut 7 Core fill, #3 horizontal rebar and masonry glue on top 5 block courses only No Geogrid Precut 7
5/5/2017 Detailing at Modular Block Face Precut Geogrid Around Shaft Location Full Coverage Geogrid Detailing at Modular Block Face Grout with Vertical & Horizontal Rebar Core Fill and Horizontal Rebar 8
5/5/2017 Observation and Measurements Observation and Measurements Offset from MSE Leveling Pad Block Course above Leveling Pad Block Course above Leveling Pad Bore Pre-Drilling Post Drilling Hole Location 1 7 12 1 7 12 1 4" 5-4/8" 6-1/8" 2 4" 4-6/8" 5-3/8" 3 4" 4-7/8" 5-4/8" 4 4" 5-3/8" 5 4" 6 7 4" 5-4/8" 6-1/8" -- -- -- -- -- 7" 4" 5-3/8" 7" 4-1/2" 5-4/8" 4" 4-3/4" 5-3/8" 4" 6" 7-4/8" 4" 6" 7-4/8" 4" 4-2/8" 7-4/8" 4" 4-2/8" 7-4/8" -- 9
5/5/2017 Observation and Measurements No measurable or very small movement even with the least combination of facing treatment and geogrid detailing (No grout, no geogrid precut) Geogrid layers at all bore hole locations cleanly sheared and no evidence of being pulled by auger Drilled hole remains open with no sign of collapse in Sandy backfill – Effect of Soil-Geogrid Composite SUMMARY / CONCLUSION Feasible to perform drilled shaft installation without casing at close proximity to the wall facing after geogrid reinforced MSE wall construction Drilling operations can be performed as close as 18 inches from the MSE wall facing with minimal remedial block facing treatments at the core This method of construction allows proper compaction of the backfill in the tight space between drilled shaft and wall facing, and reduces the impact of downdrag and therefore cost of the deep foundation structure It is acceptable to drill through the HDPE geogrid at close proximity to the wall facing without precutting the geogrid The compacted composite mass of the planar geogrid reinforced zone allowed the drilled hole to stay open and geogrid to be drilled through without measurable movement to the wall facing 10
5/5/2017 THANK YOU & QUESTIONS 11
drilled shaft 4 Core fill and #3 horizontal rebar in all block courses except grout and #3 horizontal rebar on top 5 courses. Geogrid Precut around drilled shaft 5 Core fill, #3 horizontal rebar in all block courses. Masonry glue on top 5 block courses Geogrid Precut around drilled shaft 6 Core fill and #3 horizontal rebar in all block
1 Furnaces with the same letter designation physically match the indoor coil. Uncased coils have different widths, but will fit the corresponding furnace cabinet. Series Unit Type Minor Revision Number C Indoor Coil, Upflow 1 Cabinet Width A 14-1/2 in. B 17-1/2 in. C 21 in. D 24-1/2 in. Metering Device 2 Factory installed .
NOTE: Upflow and downflow applications using an existing A coil casing is not approved: N-coils will not properly fit into A-Coil casings and retrofitting is not approved. Only replace an uncased N-coil in a N-coil casing. 3A. Upflow and downflow applications using an existing N coil casing. 1. Remove and keep front access and tubing header .
ASTM D2996 or ASTM D2997 ASTM D2996 or ASTM D2997 (1) No hydrostatic test required (2) Dimensional tolerances only Unless otherwise tested and approved by the Department, only use encasement pipe or uncased carrier pipe material that is new and has smooth interior and exterior walls. When the Plans show that the casing is to be used as a drainage carrier pipe, extend the casing the entire .
AASHTO LRFD Design Table 10.5.5.2.4-2 - Resistance Factors for Structural Resistance of Axially Loaded Micropiles METHOD/SOIL/CONDITION RESISTANCE FACTOR Pile Cased Length Tension, ϕ TC 0.80 Compression, ϕ CC 0.75 Pile Uncased Ti 080 Length Tension, ϕTU 0.80 Compression, ϕ CU 0.75 DRAFT
4.1. Cross-Hole Method The cross-hole test has been performed with uncased or cased boreholes. To asses the performance of the source, typical quality waveforms measured at various subsurface materials are presented herein. The quality cross-hole signals presented manifest the excellen
They are shipped as upflow / horizontal left and are easily convertible to downflow / horizontal right. Select CM Models are available with a factory manufactured electronic expansion valve. CUseries uncased coils are designed for upflow-only applica- tions on top of furnaces. These coils may require field modifica- tion of the ductwork.
The hydraulic drilling rig SR-50 has been specially designed for suiting the following applications: † cased bored piles with casing driven directly by rotary head and by casing oscillator powered by the base carrier itself; † deep uncased bored piles stabilized by drilling fl uid or dry hole; † CFA (Continuous Flight Auger)
The computational anatomy of psychosis hypothesis that the mean is zero. The sample mean provides evi-dence against the null hypothesis in the form of a prediction error: namely, the sample mean minus the expectation under the null hypothesis. The sample mean provides evidence against the null but how much evidence? This can only be quantified in relation to the precision of the prediction .
