advances in hollow thread bar micro pile installation ... - presentation... · micro pile...
TRANSCRIPT
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TitanHollow Bar
Advances in Hollow Thread Bar Micro Pile
Installation Techniques, Equipment, Materials, Testing
and Monitoring
ISM 2007 Toronto, CanadaHorst Aschenbroich Dipl. Ing.
President & CEO of Con-Tech Systems LTD.
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TitanHollow Bar
There are two different kinds of continuous, external threaded Hollow Bars available, mostly in standard drill rod length of 3.0 Meters, (10 feet).
One with an R-Thread or Rope Thread and the other one with the Titan Thread.
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TitanHollow Bar
Titan Thread shoulder 45+ degree
R-Thread shoulder 20- degree
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TitanHollow Bar
This presentation is based on the Hollow TITAN Bar System with the Titan Thread which we found to have certain quality and technical advantages over our R-Thread Bars, specifically for difficult and permanent installations using the IBO® method
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TitanHollow Bar
What is IBO®?
IBO =Grout
Injection Boring
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TitanHollow Bar
Developed in 1985 by the company Ischebeck in Germany and later Con-Tech Systems in Canada and in the USA.
Grout Injection Bored Hollow Bar Micro Piles are gaining increasing acceptance by engineers and the industry.
Quality materials and equipment as well as a professional installation technique has to be applied to achieve a quality end product and also the desired ground improvement.
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TitanHollow Bar
Installation Techniques and Equipment
Rotary or rotary-percussion drill with top hammer, sized for the various sizes of bars and bits. Rotation speed shall be up to 160 RPM, left turning for hollow bars up to 52 mm with left hand threads. For all other larger bars with right hand threads use hydraulic drills with right turn motors.
Drill rigs meeting these parameters are provided by:TEI, Euro Drill, Klemm, Krupp, Huette, Casagrande, Davy Drill, etc.
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TitanHollow Bar
Typical TEI rotary-percussion drill with top hammer and flushing head mounted on an excavator
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TitanHollow Bar
Techno Drill Euro Hammer on a Davy Drill
Limited access or low head room installations
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TitanHollow Bar
Grout Mixerand Grout Pump
•Typical equipment which meets these parameters is manufactured by:
•Obermann, MAT, Hany, Colcrete,
Chem-Grout
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TitanHollow Bar
For best results, use a high speed - high shear mixer with separate holding tank and water/cement dosing system to assure:
· continuous grouting, independent from mixing.
· There should be preferably two mixers, one for the thinner flushing grout and one for the finalgrout.When rock is encountered, water flushing isrequired.
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TitanHollow Bar
To assure high pressure ability during flushing or grouting, a piston or double plunger pump with minimum 60 l/minute capacity and 80 bar (1000 psi) pressure capability is recommended for cleaning out grout or dirt blockages in hoses or hollow bars, to assure uninterrupted grout flushing.
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TitanHollow Bar
MAT mixer, one holding tank and double plunger pump
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TitanHollow Bar
Obermann VS 63
High speed high shear mixer with two water tanks and two mixers. One for the thinner flushing grout and one for the final grout. Also a double plunger pump.
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TitanHollow Bar
Obermann VS 110
Mixer with water dosing and cement weighing scales
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TitanHollow Bar
Obermann
Logger
The use of an automatic logging system for measuring, recording and documenting of grout volume and pressure is also recommended.
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TitanHollow Bar
Installation Techniques
Drilling, Flushing and Grouting
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TitanHollow Bar
Flushing head on a Klemm 804.
The holder is bolted to the hammer to prevent the housing from rotating.
The hollow Titan bar is screwed directly into the
flushing head
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TitanHollow Bar
Threading on drill bit
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TitanHollow Bar
The drill shall be equipped with a hydraulic clamp to prevent un-threading of couplers below ground. (Very important when using R-Thread Bars).
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TitanHollow Bar
Start pumping and make sure grout will exit drill bit.
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TitanHollow Bar
flushing out drill cuttings
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TitanHollow Bar
Outflow of final grout,notice different colors.
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TitanHollow Bar
The Structure ofHollow Bar Micro Piles
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TitanHollow Bar
The hollow bar, used as both drill rod and grout conduit, is left in the ground as reinforcing steel to transmit compression, tension, and lateral forces. Hollow bars have a larger section modulus than solid bars which increases their bending capacity. With the continuous tremi-grout injection, 100% grout cover and therefore excellent corrosion protection is accomplished, similar to reinforcing steel in concrete.
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TitanHollow Bar
The rotation and jetting of the cement grout into the surrounding ground, stabilizes the borehole, consolidates the soil and increases its original
shear strength in most soils.
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TitanHollow Bar
Typical cross section of an exhumed IBO® Micro-Pile
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4
1- Hollow Bar
2- Final Grout W/C 0.45
3- Flushing grout W/C 0.7 Soil Cement mix
4- Ground improvement 27
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TitanHollow Bar
MaterialsSince the hollow bars are used as drill rods and subjected to high torque forces, the steel shall be of a fine grain and ductile quality.The thread type deformations shall develop bond to the grout, the same as with deformations on concrete reinforcing bars.
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TitanHollow Bar
TITAN Hollow Bars range in size from 30 to 130 mm (1 ¼” to 5”) diameter with ultimate tensile loads up to 7940 kN, (1785 Kips), 892 tons
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TitanHollow Bar
Important Requirement:
The thread shall be designed to transfer loads through the couplings (every 10 feet) without excessive slippage inside couplers and shall
comply to requirements for mechanical splices of reinforcing bars
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TitanHollow Bar
Typical TITAN Bars meeting the requirements of reinforcing steel ASTM A615 specifications for deformation requirement and bond development.
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TitanHollow Bar
A: clay and sand bitB: cross cut bit for gravel,
hardened for sand stone and weathered rockC: carbide cross cut bits for varies rocksD: button bits for hard rock
A AB
C C
D DD
TITAN
Drill bits
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TitanHollow Bar
Grout ports in Drill Bits
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TitanHollow Bar
Jets can be threaded into the bits to create higher pressure to enlarge pile diameter .
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TitanHollow Bar
Full strength Couplers
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TitanHollow Bar
Special bayonet coupler for special under- water installations
Couplers with centre stop and seals36
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TitanHollow Bar
Steel Centralizer to allow for grout
passage
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TitanHollow Bar
Spherical hex nuts,2 nuts for
tension/compression piles,
(bearing plate with top and bottom nut)
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TitanHollow Bar
TestingThere is no difference between testing Hollow
Bar Micro Piles and Standard Micro Piles
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TitanHollow Bar
Typical tension test set up for a pile group
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TitanHollow Bar
Typical compression tests
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TitanHollow Bar
Monitoring
Hollow Bar Micro-Piles with Vibrating Wire strain gauges inside
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TitanHollow Bar
Strain Gauge with Centralizer
Installing strain gauges
on a fiberglass rod pushed into a hollow bar
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TitanHollow Bar
0
1000
2000
3000
4000
5000
6000
-1000 -800 -600 -400 -200 0 200 400 600 800 1000
Load, kN (tension+)
mic
rost
rain
Initial Loading Cycle
Titan Bar 73/53 with 6" VWSG-E Strain Gauge cf RST VWA-220-3.937 S/N VC1300
Predicted strain from COSMO FEM model
Calibration loading response chart
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TitanHollow Bar
This test plot shows the loads in the three gauges. Only the test load L-1 and all locked-in residual loads are shown after relaxing the load to 5 Kips and zero load.
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TitanHollow Bar
Some Interesting Current Projects
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TitanHollow Bar
The following projects are examples where this product contributed in large to their success, not only economically but also technically.
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TitanHollow Bar
Seismic upgrading and Underpinning of the Capitol State Buildingin Salt Lake City, Utah
over 3000 Hollow Bar Micro Piles were installed
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TitanHollow Bar
Difficult installation, under low head room49
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TitanHollow Bar
Limited access
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TitanHollow Bar
Drilling pile groups51
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TitanHollow Bar
Pile groups for underpinning existing foundations52
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TitanHollow Bar
Testing pile groups in tension with a single jack
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TitanHollow Bar
forming pile caps54
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TitanHollow Bar
Seismic Upgrading of a Bank Building in Berkeley California
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TitanHollow Bar
Micro Pile Foundations for Wind Power
Turbines
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TitanHollow Bar
Placing of Reinforcing Steel and Sleeves
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TitanHollow Bar
Placing of Concrete Pile Cap58
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TitanHollow Bar
Drilling Hollow Bars Through Pile Cap59
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TitanHollow Bar
Post-Tensioning and Testing60
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TitanHollow Bar
Placing of Tower61
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TitanHollow Bar
Two Devil Slide Projects for Caltrans,Pacific Coastal Highway, PCH-140 Miles south of San Francisco
· Emergency slide stabilizationas per Chapter 6 of the FHWA Implementation Manual, Design of Micro Piles for slope stabilization
· South Tunnel Portal, New Retaining Wall Support
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TitanHollow Bar
The project63
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TitanHollow Bar
No. 1
Emergency Slide Stabilization with Micro Piles as per chapter 6 of the FHWA Micro Pile Implementation
Manual
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TitanHollow Bar
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TitanHollow Bar
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TitanHollow Bar
Failing, existing shotcrete slope
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TitanHollow Bar
Installing new IBO-Titan Anchors68
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TitanHollow Bar
Drilling from a cage69
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TitanHollow Bar
Drilling battered micro piles70
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TitanHollow Bar
Vertical and battered micro piles
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TitanHollow Bar
Forming of Pile Cap72
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TitanHollow Bar
Finished emergency Slide Repair73
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TitanHollow Bar
Using Hollow Bar Micro Piles, for slope stabilization, Caltrans
could re-open the Pacific Coastal Highway
two months ahead of schedule.
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TitanHollow Bar
No 2.
South Tunnel Portal Retaining Wall Support and
slope stabilization
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TitanHollow Bar
Over 140 straight and battered Micro Piles to support the new retaining Wall and to stabilize the slope below
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TitanHollow Bar
Vertical and battered Micro Piles77
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TitanHollow Bar
Grout Injection Boring78
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TitanHollow Bar
Trench to collect flushing grout
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TitanHollow Bar
Random compression testsof production piles
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TitanHollow Bar
Exposed excellentground improvement
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TitanHollow Bar
Forming of retaining wall
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TitanHollow Bar
Piles are overlapping into wall by 1.0 m
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TitanHollow Bar
Road is re-aligned
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TitanHollow Bar
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TitanHollow Bar
Ready for TBM, (Tunnel Boring Machine)86
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TitanHollow Bar
California coast line at Devil Slide
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TitanHollow Bar
Thank you for your attention