Loadtest ocell technology in continuous flight auger piles. By 2016, ougan was able to contribute to the geotechnical industry by providing super cells and service to more than 2,000 bi. Ocells range in capacities from 200 kips to 6,000 kips. Given that the ocell utilizes reaction from shaft friction above the ocell and from end bearing and shaft resistances below the ocell, testing a shorter pile using ocell might not provide all the desired design parameters. Osterberg, professor emeritus of civil engineering at northwestern university, invented and developed a deep foundation load testing device to meet the construction industrys need for an innovative effective method for testing high capacity drilled shafts and piles. Using the o cell, fugro loadtest has elevated the application of deep foundation load testing, from expensive, timeconsuming, small scale field tests to stateoftheart, shortduration, full scale load testing of production.
It also simulates the loadmovement behaviour of the pile in a static headdown and ocell loading test. Strain gauges were used in addition to standard o cell instrumentation. In fact, prosoil foundation consultant introduced pile dynamic testing in bangladesh in 2006. We have appointed experienced engineers, who have been working in this domain for years.
An equivalent pile loadhead settlement curve to predict pile capacity has been obtained by using test results from the osterberg cell ocell. Although castin place concrete piles are common, limited pile load testing has been undertaken on these. Bidirectional test o cell the bidirectional test is an alternative for the static load test for bored concrete piles. By using multiple ocells on a single horizontal plane, the available test capacity can be designed to obtain virtually any load. The test pile barrette often includes monitoring strain gauges embedded in the shaft. Report fhwanhi16010, us department of transportation, fhwa, washington dc, 20590. This paper presents a case study of a pile load test that was conducted using an ocell at southern alberta. The resulting signal reflectogram readily provides information regarding the. O cell instrumented barrette cage each o cell loading assembly was fixed to the reinforcing cage before being lowered into the test pile and concreted.
Federation of piling specialists handbook on pile load testing. Characteristic of this type of pile testing is that the load is applied somewhere halfway in the pile, instead of at the top of the pile. Deep foundation, fullscale load testing, drilled shafts, civil engineering. Prosoil foundation consultant provides various testing services in the field of pile foundation as listed below. Ocell test load was 17 mn, giving a total potential maximum test load of 34mn i.
Augercaste pile inspection applied foundation testing is a team of highly specialized engineers, and professionals devoted to the foundation testing industry. Ocell pile load test technology solutions for railway. When it is the intention to test a pile to geotechnical failure, due consideration must. The load cell is located within a predetermined position within the pile in order to provide the appropriate reaction response. Pile testing osterberg cell marioooo16 geotechnical op 11 dec 16 14. In this paper, actual test pile loaddeformation results are compared to the class a prediction, together with a backanalysis of the ocell testing using numerical methods for calibration of rock stiffness and assessment of topload pile response. Super cell profileougan bidirectional static load test.
Loadtest specializes in bidirectional deep foundation load testing using the award winning osterberg cell. Pile load testing, using a proper rigid system, offers project developers the highest level. Pile instrumentation with strain gauges, tell tales, load cells, caliper logging of pile drilled holes. June, 1996 test program instituted by the louisiana department of transportation will. Hello, i have a question regarding testing of piles usign osterberg cell ocell. By utilizing multiple ocells on different planes, distinct elements within a shaft or pile can be isolated for testing. Osterberg cell pile load test in calgary, alberta a case. Excellent tool for value engineering foundation redesign for pile and barrettes for both compression and tension tests. Paul cheesman, an expert on foundation testing at fugro is an. O cells range in capacities from 200 kips to 6,000 kips. These tests are carried out via a load cell installed within the pile, with the pile providing both the reaction and the tested section. Experimental study on ocell test of long rock socket.
Load testing with the ocell continues until one of three things occurs. O cell test in progress testing of the piles was carried out at ground level. The pile is struck with a handheld hammer and the pet digital accelerometer records the reflected waves on the computer screen. High strain pile testing pile driving analyzer dynamic. Aspects of drivability and residual stress are also included. Ocell testing and bored piles have a mutually beneficial. Characteristic of this type of pile testing is that. Prosoil foundation consultant is determined to advance the field of pile testing in bangladesh on and is a leading firm in the use of pile dynamics. Special attention will be given to the limitations of pile integrity testing. Ocell pile test in the danube, where bidirectional testing was used to test pile loads in excess of 17mn. Fugro completes bidirectional working pile load tests for. Low strain dynamic pile testing pile integrity testing pit astm d5882 it is a quick nondestructive test to check the integrity of pile shaft.
Instrumentation is included in each test pile barrette for direct measurement of o cell expansion, pile compression and topof pile barrette movements. This testing can help you pick up the right pile type that can withstand the strains on the pile during driving and gives cautious if the pile driving reaches its required length thus avoiding unnecessary. The depth of the ocell within the pile is set according to the test program requirements. A low strain compressive stress wave is generated by an impact using handheld hammer either normal or instrumented of weights ranging from 0. Concrete was delivered by pump through a pipe to the base of the pile until the top of the concrete reached near the ground surface. By utilizing multiple o cells on different planes, distinct elements within a shaft or pile can be isolated for testing. Static pile loading tests bidirectional o cell systems. Multiple cells can be cast within a test pile to isolate endbearing and shaft friction effects or to evaluate directional effects of shaft friction. The osterberg cell and bored pile testing loadtest. Comparison of the bidirectional load test with the top.
Of note, this procedure is not used for steel hpiles or nonconcrete pipe piles. A sample of an endorsed calibration report for load cell is shown in annex a. Class a prediction versus performance of ocell pile load. Dynamic load testing with the aid of pile dynamic analyzer pda is a fast and reliable way to evaluate the bearing capacity of the pile. Pet uses the pulseecho method pem, pit for pile testing. Further, we are also known for our clientcentric approaches and transparent business dealings. The ocell derives all reaction from the soil andor rock system. Osterberg ocell assembly see photo 1 was inserted into the pile bore and temporarily supported from the casing.
The bearing behavior and load transfer characteristics were analyzed. Used to determine pile length or the integrity of piles with high impedance, lowstrain methods can test many piles in one day. Is there any manufacturer who sells equipment for this type of investigation because on web i can only find companies providing testing services. Providing a portable system, which meets the astm specifications developed for deep foundation load testing, is essential. Static load testing using o cell 12122016 alaa mohamed metwally 5 fig.
It also simulates the loadmovement behaviour of the pile in a static headdown and o cell loading test. Osterberg cells have been mounted in the reinforcing cage together with the instrumentation for load testing of a wide range of sizes and depths. Sign in private video o cell private video part 1 private video part2. Unipile considers bearing capacity, pile group settlement, negative skin friction, and drag load. In addition canary systems developed custom hardware and software to. Pdf technical and economic benefits of ocell load testing for. However, because the ocell test uses a loading mechanism entirely different from that of the conventional pile loading testing method, many investigators and practicing engineers have been concerned that the ocell test would give inaccurate results, especially about the pile head settlement behavior.
The latest developments in hardware and software will be presented. Piletest systems for integrity testing of foundations piles. Prior to the ocell testing of the first test pile sc02, a class a prediction was carried out. The test pile location borehole was terminated in rafted clay shale at a depth of 25. Deep foundation testing products from pile dynamics. Thus, an 0cell test load placed at, or near, the bottom of a bored pile has twice the testing effectiveness of that same load placed at the top. Osterberg cell, which is placed inside the pile under test. Aatech engineers have developed automated testing systems and data acquisition software to.
O cell is a registered trademark the ocell advantages design. By using multiple o cells on a single horizontal plane, the available test capacity can be designed to obtain virtually any load. Axial load test procedures for pile foundations introduction because of the nonavailability of reliable procedures for assessing the load transfer mechanisms between piles and surrounding soil, or for determining the ultimate capacity of piles, fullscale load tests are conducted. Pile testing osterberg cell soil testing engineering.
We leverage this knowledge to help design the optimal load test program and. Ocell testings case histories demonstrate the importance. Traditionally, bdslt has been the most trusted means of testing pile foundations axial capacity. The osterberg cell static loading test linkedin slideshare. An equivalent pile loadhead settlement curve to predict pile capacity has been obtained by using test results from the osterberg cell o cell. They make sure that the highest standards of quality are maintained at each level to ensure successful testing. Feasibility of diaphragm wall with posttensioned anchors in noncontrolled fill material. Project profile osterberg cell load testing overview dr.
Using a randolphtype elastic pile model, a case study involving axial shaft response in stiff clay till is presented. The bidirectional test is an alternative for the static load test for bored concrete piles. Because the cell loads are resisted by shaft resistance above the cell and pile end bearing below the cell, loaddeformation data for the pile tip and pile shaft can be obtained independently. The ocell test can provide a useful tool for optimizing foundation design, which. The pda evaluates shaft integrity, driving stresses and hammer energy when monitoring pile installation. Dutch pile testing pr actice, like detection of pile head def ects with a spike type hammer pulse, and the site average or pile group average for the qualitative interpretation of measured signals. The stratigraphy at the test pile location including blow counts n values is presented on figure 2.
S to perform the load tests and to prepare report of test results. End bearing provides reaction for the side shear portion of the ocell load test, and. Bidirectional loading test method for foundation pile testing with ougan super cells is widely used among load test companies, engineering consultancies, project owners and contractors. Ensuring accuracy in pile load testing is a critical part of pv solar power projects. The ocell test method which was applied on the pile load testing was introduced, including the basic principle, test device and test technique. Load testing with the o cell continues until one of three things occurs. Pdf osterberg test as an alternative pile testing method. Ocell test in progress testing of the piles was carried out at ground level. At the test pile location, rafted clay shale was identified at a depth of 22.
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