The O-Cell Advantages Successful  Design: Excellent tool for value engineering Bi-Directional Load redesign for pile and barrettes for both compression and tension tests. Testing Worldwide BI-  High test load capacities: Test loads exceed Over 5000 O-Cell load tests have been 27 MN on a routine basis. O-cell test capacities performed in over 65 countries, each are available from 0.4 MN to greater than 220 MN expanding on LOADTEST's unmatched under suitable conditions. record of success.  Reduced work area: Required work area (overhead and laterally) is greatly reduced vs. any Drilled shafts other static system. Testing has been The O-cell can be used in drilled shafts or performed inside buildings, under overpasses, in bored piles either attached to the narrow interstate/highway median strips and off- shore. reinforcing steel cage or placed using a steel beam carrier frame. Multiple O-cells  Time: Testing is performed once has can be used in the same shaft, either in reached suitable strength (which typically takes Steel Pipe pile load testing with the O-Cell 7-14 days from pile installation). the same plane to increase the available test capacity or in multiple levels to  Improved safety: No reaction system is required at ground level and the test energy is isolate distinct or rock strata. safely buried below ground. Driven Piles  Rock sockets: High test loads can be applied Load testing can be performed on steel directly on deeply buried rock or soil formations pipe piles, pre-cast concrete piles, without load shedding in overlaying , which battered/raking piles and cylinder piles. eliminates the need for de-bonding techniques. For driven piles, a rugged design has  Deep -off levels: O-cell tests can be ensured that even O-cells driven to performed with the top of concrete far below ground, eliminating the need for pile extensions to refusal conditions of 80 blows/100 mm ground level, pile head preparations or provision perform flawlessly. for zones of reduced shear. CFA/Auger Cast Piles  Piles with Plunged Columns: Where steel O-cells can be inserted into the fresh columns have been cast in the top of the pile, these often interfere with top-down testing concrete/grout immediately after drilling to techniques, and the O-cell testing method is likely depths in excess of 50 m and diameters to be the only cost effective way of performing a of 900 mm. full scale static load tests on these piles. Installing an O-cell into a precast pile Slurry Walls / Barrettes  Accuracy: Since there are no anchors, reaction piles or a reaction mass required, the Multiple O-cells have been placed in panel influences, in terms of modified test pile sections efficiently at depths beyond 95 m performance, resulting from the construction and and in multilevel configurations mobilising use of anchors, reaction piles or a reaction mass more than 363 MN. required in top-down static testing are eliminated.  Economy: The O-cell method becomes more Additional Services economical as loads increase, unlike traditional Top-down Load Testing top-down static tests. Using completely automated hydraulic  Shear / end bearing components: The O-cell control and data recording systems, tests are designed to separate test piles into 2 or where the safe progress of the test can 3 pile sections; thus automatically measuring the reaction of each of the components. be supervised by remote control and comprehensive instrumentation.  Automation / static creep effects: The O-cell test is a static maintained load test and uses Lateral Load Testing automatic data acquisition techniques and load Lateral testing of soil and rock formations maintenance for accurate, efficient data for modulus determinations can be BI-DIRECTIONAL processing and creep measurements. Installation of O-Cells into a barrette performed with O-Cells modified for  Production / working Piles: Post-test grouting placement within a single shaft or pile. techniques allow for testing of production LOADTEST also conducts traditional pile/shafts and barrettes. International Offices: Osterberg Cell Fugro Geoservices Ltd (LOADTEST) lateral load tests with or without  Performance: The subsequent pile simultaneous axial loading. performance of O-cell tested production piles will 14 Scotts Avenue, Sunbury on Thames, be similar to the non-tested production piles due Middlesex, United Kingdom TW16 7HZ Crosshole Sonic Logging (CSL) to the lower amount of generated residual Phone and Fax: +44 (0) 1932 784807 LOAD TESTING LOADTEST provides complete CSL stresses in the pile, as compared to applying full email: [email protected] testing services. test loads “top-down”. Fugro Singapore Pte Ltd (LOADTEST)  Off-shore: The O-cell test method particularly 29 Loyang Crescent Hole Calipering excels in off-shore testing environments due to its Singapore 509015, Sonic based calipering provides full high Phone: +65 6861 0878• Fax: + 65-6377-3359 convenience and numerous advantages resolution 3-D image of bored shaft illustrated above. Tests have been performed with email: [email protected] piles completely submerged under water. excavations. Fugro USA Land Inc. (LOADTEST)  Foundation behaviour analysis: Numerous 2631 N.W. 41st Street, Gainesville, Florida 32606 Low and High Strain tests advanced analysis techniques can be used to Phone: +1 352-378-3717 • Fax: +1 352-378-3934 Pile driving analysis, dynamic load tests enhance the accuracy of the interpretation of the ® ® ® email: [email protected] and integrity tests. pile behaviour, Cemset /Cemsolve & Timeset . Fugro Middle East BV (LOADTEST)  Industry expertise: All genuine O-cell tests Thermal Integrity tests P.O. Box 2863, Dubai, UAE come with planning, installation, testing, analysis Phone: +971-4-3474060 • Fax: +971-4-3474069 Integrity of the cast concrete is evaluated and reporting services performed by the world’s email: [email protected] by the manner in which it hydrates in leading experts in of deep time. foundations. website: www.fugro-loadtest.com

Copyright © Fugro Loadtest 2017 TESTING, EQUIPMENT & SERVICES • SPECIALIZING IN OSTERBERG CELL TECHNOLOGY O-cell is a registered trademark ® A member of the Fugro Group of companies with offices throughout the world

® Founded in 1991, LOADTEST specializes in bi-directional deep The O-Cell Test Results foundation load testing using the award Dr. Jorj O. Osterberg, Professor Emeritus of lower side shear provide reaction for the The results from the O-cell load test are Civil Engineering at Northwestern University, upper side shear portion of the O-cell load test the reason more engineers and winning O-Cell. Through its research invented and developed a deep foundation and upper side shear provides reaction for the and hard work, LOADTEST has contractors are turning to the O-cell. load testing device to meet the construction end bearing and lower side shear portion of Since the end bearing and the upward redefined the art of load testing. industry's need for an innovative effective the load test. method for testing high capacity drilled Load testing with the O-cell continues until shear resistance are measured No job has been too big or too small to shafts, piles and barrettes. Osterberg's one of three things occurs: ultimate skin independently, there is no guesswork in enjoy the advantages of the O-Cell. invention, the Osterberg Cell, or O-cell, has or side shear capacity is reached, how much load was carried by each Numerous world testing records have radically changed the way foundation load ultimate end is reached or component. Testing is typically been set using the O-Cell: In 2010, tests are designed, the maximum performed until the ultimate capacity in 320 MN on a 3.35 m diameter pile in a performed and O-cell capacity either shear or end bearing is reached, so interpreted. is reached. Each the maximum unit loads can accurately rock socket for the foundations of the No longer do O-Cell is New Mississippi River Bridge; by be obtained (See Diagrams A & B). The engineers need to specially addition of strain gages within the Single level O-cell assembly ready to install rely on small, instrumented to Multilevel O-cell assembly 2013, the maximum load mobilised in a shaft/pile can help in determining the 2.2 m pile was 323 MN for the Ohio scaled down test allow for direct piles due to the measurement of distribution of load throughout the shaft River bridges project, for a barrette the enormous the cell's length. An O-cell load test also provides maximum is 363 MN. As of 2016, expense of expansion. By information about creep limit loads in Fugro Loadtest has completed over conventionally also measuring shear and end bearing. As required, 5000 load tests and adding a further testing large the top of shaft LOADTEST can provide, or assist with 300-400 tests per year. Over 20% of diameter piles. movement and preparing a complete report documenting Non-conservative compression, these tests had total loads in excess of the O-cell test data and results. We scaling errors can the downward routinely provide the equivalent top load 40 MN. The O-Cell can be used to be eliminated by movement is isolate portions of a drilled shaft or pile testing the full determined. movement curve and have several methods at our disposal. for testing, or can be used to test size production O-cells range in piles even if loads capacities from multiple levels within the same pile. exceed 200 MN. 0.4 MN to Whether in the middle of the Mekong The O-cell is a 27 MN. By River in Vietnam, off the coast of South hydraulically using one or driven, calibrated, multiple O-cells Africa or just down the , sacrificial jacking on a single High capacity testing with multiple O-cells LOADTEST and the O-Cell have risen Steel carrying frame can be used device installed horizontal to every challenge. within the plane, the foundation unit. available test LOADTEST offers O-Cell load testing Working in two capacity can be equipment and installation assistance. directions, increased to upward against more than LOADTEST can also provide full side-shear and 220 MN. By planning and specification support, downward against utilizing field load testing and analytical end-bearing, the multiple cells on services. LOADTEST is dedicated to O-cell automatically separates the resistance different planes, distinct elements within a data. By virtue of its installation within the shaft or pile can be isolated for testing. advancing state-of-the-art deep foundation member, the O-Cell load test is Using the O-cell, LOADTEST has elevated foundation load testing. not restricted by the limits of overhead the application of deep foundation load structural beams and tie-down piles or testing, from expensive, time consuming, In 2009, LOADTEST are proud to have anchors. small scale field tests to state-of-the-art, short joined the Fugro Group of Companies. Instead, the O-cell derives all reaction from duration, full scale static load testing of the soil and/or rock system. End bearing and dedicated or production shafts and piles. Testing multiple test piles

O-cell test setup

Test shafts/piles from 4.5-107 m have been successfully installed. Precast piles as long as 40 m have been driven and Conventional lateral load test Split cylinder lateral rock modulus testing tested with the O-cell. using an O-cell Copyright © Fugro Loadtest 2017 O-cell is a registered trademark ®