What is Osterberg Cell? Introduction • The Osterberg Cell is a Sacrificial jack-like device which the Engineer can have installed at the tip of a driven pile or on the reinforcement of a bored pile.
What is Osterberg Cell?
Introduction • The Osterberg Cell is a Sacrificial jack-like device which the Engineer can have installed at the tip of a driven pile or on the reinforcement of a bored pile. • The cell provides the static loading and requires no overhead frame or other external reaction system.
How does an osterberg Cell work?
The O-cell is a hydraulically driven, high capacity, sacrificial jacking device installed within the foundation unit. Working in two directions, upward against side-shear and downward against end-bearing, the O-cell automatically separates the resistance data.
What is Ocell test?
The O-cell test is a full scale static loading test, just two running simultaneously, which measure directly the upward upper skin friction and downward end bearing and lower frictional resistance.
What is a Kentledge used for?
Kentledge (fr. ballast), or kentledge weights, are slabs or blocks of concrete or iron (usually pig iron, sometimes with a cast-in handle for assist moving). They are used within ships or boats as permanent, high-density ballast.
What is PDA test?
High Strain Dynamic Load Tests, also called PDA tests, assess the capacity of several piles in a single day. PDA tests are performed during driving on pilot or production piles, taking advantage of the high strain impact provided by the driving hammer.
How do you do a plate load test?
The test procedure of plate load test is as follows:
- A seating load of 70 gm/cm2 is applied and released after some time.
- The plate is loaded either through a kentledge or by the reaction through a truss or a beam.
- The load is applied in the increments of 1/5th of the design load or 1/10th of failure load.
What is the purpose of PDA test?
High Strain Dynamic Load Tests, also called PDA tests, assess the capacity of several piles in a single day. Pile Driving Analyzer systems also evaluate shaft integrity, driving stresses, and hammer energy when monitoring installation.
How long does a PDA take?
The PDA closure procedure may take up to three hours, depending on the type of procedure. It may take longer if the PDA closure is accompanied by other procedures to correct any additional heart defects.
What is mean by plate load test?
The Plate Bearing Test (or Plate Loading Test) is an insitu load bearing test of soil used for determining the ultimate bearing capacity of the ground and the likely settlement under a given load. A factor of safety is applied to give the safe bearing capacity of soil.
How do you perform a SPT test?
Procedure. The test uses a thick-walled sample tube, with an outside diameter of 50.8 mm and an inside diameter of 35 mm, and a length of around 650 mm. This is driven into the ground at the bottom of a borehole by blows from a slide hammer with a mass of 63.5 kg (140 lb) falling through a distance of 760 mm (30 in).
How long does a PDA test take?
35-minute
Administrative details. The Practical Driving Assessment (PDA) is a 35-minute on-road test taken with a Department of Transport assessor. The PDA assesses your ability to operate and guide the car, put the road rules into practise, fit in with other traffic, and see and respond to hazards.
What is RMX in PDA test?
Note that the RMX (maximum CASE Method resistance) or RSU (maximum Case Method resistance with correction for unloading) values will change for all the blows whenever the wave speed is corrected during the testing program.
What is the Osterberg cell and what does it do?
Osterberg’s invention, the Osterberg Cell, commonly called the “O-cell” by the industry, has radically changed the way foundation load tests are designed, performed and interpreted. The O-cell is a hydraulically driven, high capacity, sacrificial jacking device installed within the foundation unit.
How is the Osterberg cell different from a top load test?
• The Osterberg cell loads the test pile in compression similar to a conventional top load test, and hence the data form o cell is analyzed in much the same way of conventional test. • The only significant difference between the two tests is that the o cell provides two load-movement curves,…
How did the O-cell load test get its name?
O-Cell® Load Testing Patent US 7353714 The award winning Osterberg Cell ®, or “O-Cell”, gets its name from the inventor, Dr. Jorj O. Osterberg. The O-Cell is a hydraulically driven, high capacity, sacrificial loading device installed within the foundation unit.
How does the O-cell in a foundation unit work?
The O-cell is a hydraulically driven, high capacity, sacrificial loading device installed within the foundation unit. As the load is applied to the O-cell, it begins working in two directions; upward against upper side shear and downward against base resistance and lower side shear (if applicable).