This work shall be measured as the number of drilled shafts on which crosshole sonic logging csl testing is performed and found to be void free in accordance with the special provision. These tubes are usually attached to the reinforcement cage along the full length of the shafts. Crosshole sonic logging integrity testing for the new. Nicholas butel, alex hossack and mehmet s kizil, prediction of in situ rock strength using sonic velocity, 14th coal operators.
Results were obtained from a scalemodel laboratory experiment and from computer simulations. Lwd sonic logging in large diameter surface holes onepetro. Also more advanced postprocessing techniques fails or make the test to advance to use on a daily basis. Cross hole sonic loggingtest software cha 1 erandi h. Prediction of in situ rock strength using sonic velocity nicholas butel univesity of queensland. Data acquisition creating a document to acquire data 3 file new project 4. Crosshole sonic logging csl is a test used to establish concrete integrity. Use a minimum of 1 noncorrosive circular spacer per 30 inches of circumference of the reinforcing steel cage, within 5 to 10 feet of the bottom and top, and at intervals not to exceed 10 feet vertically. A study of sonic logging in a cased borehole onepetro.
Introduction o deep foundations integrity testing mostly applies. Performance verification of constructed geotechnical facilities amherst 2000. Even when defects are indeed encountered, they may not always be. Defect detection and examination of large drilled shafts using a new crosshole sonic logging system article april 2000 with 55 reads how we measure reads. Crosshole sonic logging test for piles waves mechanics scribd. In situ estimation of roof rock strength using sonic logging. Flab cross hole sonic logging test 3 flab for soil testing. Terracon foundation and structural consulting professionals offer ndt testing of deep foundations using crosshole sonic logging csl, crosshole tomography ct. The most commonly used down hole sonic logging tool is the multichannel pwave compensated series.
Earthspectives gammagamma logging, crosshole sonic. In the model two holes were constructed to simulate the crosshole measurement system in the field. Crosshole sonic logging and lowstrain impact echo integrity testing were both speci. Quantifying pile head condition before basement excavation by crosshole sonic logging tests narong thasnanipan1, zaw zaw aye2, thayanan boonyarak3 and natamon kampananon4 abstract in wet process bored piles construction, it is necessary that concrete is continued to be placed until good. Integrity evaluation of concrete by crosshole sonic. The spacing between the receivers is usually 2 ft, which. Comparing crosshole sonic logging and lowstrain integrity testing results white, b. The test is carried out in foundations where steel tubes. Sonic logging tools contain one or more transmitters which generate high frequency generally 20 to 24 khz sound waves, which then travel.
This work shall consist of furnishing and installing materials and equipment necessary to install access ducts in all drilled shafts of structures identified on the plans, and to perform crosshole sonic logging csl testing of. Earthspectives specialize in foundation engineering and testing services such as gammagamma logging, cross hole sonic logging, pile dynamic analysispda, etc. Our geological and mining consulting services are now augmented by the ux5 hp fixedwing drone, or unmanned aerial system uas. The problem with this arrangement is that if the tool is tilted in the hole, or the hole size changes fig. This model demonstrates how to simulate a piezoelectric transducer as both a sound transmitter and a receiver in a well logging setup. Crosshole sonic logging astm 6760 02 usama khalid 2011msceg24 ziaurrehman 2011msceg18 contents o introduction o crosshole sonic logging o tube installation o wave requirments o tube specifications o limitations o case study o references. Defect detection and examination of large drilled shafts. The proposed use of ischebeck titan t7356 cslhollow threaded rebar for cross hole sonic logging access tubes combined with longitudinal concrete reinforcing in drilled shafts patent pending is discussed as an alternative method of.
The csl test involves lowering ultrasonic probes through access tubes along the. The single hole sonic logging method is used in cases where only a single access tube can be placed in a deep foundation, and tests the concrete quality in the region around. The purpose of this measurement is to locate each borehole in 3dimensional space and thereby obtain boreholetoborehole straightline distances for each test depth. Crosshole sonic logging integrity testing for the new cooper river bridge edward l. The sonic access tubes do not contribute to the structural capacity of the drilled shaft. Cross hole sonic logging codes, specifications and guidelines usa. The waveforms from the computer model indicate that sonic logging can be successful in bonded and unbonded cased holes. Abstract sonic logging in large diameter surface holes in offshore environments such as the gulf of mexico has traditionally been problematic from both operational and economic perspectives.
The flh study, velocity variations in crosshole sonic logging surveys. Geoinstitute asce specialty conference april 9 12, 2000 university of massachusetts, amherst defect detection and examination of large drilled shafts using a new crosshole sonic logging system les r. The singlehole sonic logging method is used in cases where only a single access tube can be placed in a deep foundation, and tests the concrete quality in. Crosshole sonic logging brochure papworths construction. Tallent palmetto bridge constructors, charleston, south carolina donovan l. Pdf crosshole sonic logging and frequency tomography analysis.
Acquisition of highquality wireline sonic log data in lar. The analysis first identifies design criteria and construction. Integrity evaluation of concrete by crosshole sonic logging in bangladesh m. Integrity issues for castinplace piles have resulted in a.
Performance verification of constructed geotechnical. Cross hole sonic logging codes, specifications and guidelines. D676016 standard test method for integrity testing of concrete deep foundations by ultrasonic crosshole testing ultrasonic cross hole test augercast piles bored piles diaphragm walls ultrasonic probes dams drilled shaft. Crosshole sonic logging csl has become the standard practice for testing the integrity of drilled shafts. A study was undertaken to investigate the feasibility of sonic logging in a cased borehole. Technical note hollow threaded rebar for cross hole. Pdf crosshole sonic logging csl has over recent years become the standard method for evaluating the integrity of bridge drilled shafts. Crosshole sonic logging of secant pile walls a feasibilty study ernst niederleithinger, bam federal institute for materials research and testing, berlin, germany joram m. A piezoelectric transducer is used to generate a signal that propagates as a sound compression wave within the concrete, while another transducer is used to detect the signal.
By sending ultrasonic pulses through concrete from one probe to another probes located in parallel tubes, the csl procedure inspects the drilled shaft structural integrity of the concrete between the tubes, and extent and location of defects, if any. Defects present in a pile may not be encountered during a crosshole sonic logging csl test. Easytoinstall sonic tube system for csl sonitec is a tube solution invented to facilitate the integrity testing of foundations using the csl testing method. Cross hole sonic logging and lowstrain impact echo integrity testing were both speci. Sample specification for crosshole sonic logging csl. A variation of the csl method, called single hole sonic logging ssl can also be used on smaller diameter drilled minipiles and auger cast piles. Crosshole sonic logging csl, also known as cross sonic logging or the sonic logging test is the most accurate and reliable technique for assessing the integrity of deep foundation elements such as newly placed concrete drilled shafts and slurry walls, particularly when drilling below groundwater level. The chum cross hole ultra sonic monitor uses the crosshole sonic logging csl method to perform highresolution quality control of deep foundations the system uses an ultra sonic wave sent from a transmitter to a receiver pulled through water filled access tubes embedded in the concrete. Types of sonic logging tools are explained briefly with help of animation and what are the application of these tools in determining the formation properties. Crosshole sonic logging csl, also known as cross sonic logging or the sonic logging test is the most accurate and. Geo dynamics indian construction industry vadodara.
Causes and impacts in drilled shafts fhwacfltd08009, identifies conditions that affect the loadbearing capacity of drilled shafts by modeling various conditions and analyzing them with numerical methods. Crosshole sonic logging companies wv department of. A variation of the csl method, called singlehole sonic logging ssl can also be used on smaller diameter drilled minipiles and auger cast piles. Reliability evaluation of crosshole sonic logging for.
The csl test involves lowering ultrasonic probes through access tubes along the length of the foundation element and as the probes are pulled to the surface a data processor records the passage of. The ux5 hp is a professional grade aerial mapping system that captures high resolution photographs. This system is well suited to rapidly collect aerial imagery and topographic information at large sites where traditional surveying techniques would not be effective. Cross hole analyzersoftware step 1 data acquisition step 2 data editing step 3 report preparation 2 3. Easytoinstall sonic tube system for csl dextra group. Pdf the crosshole sonic logging csl measurement system to. American society for testing and materials, astm d676002 standard test method for integrity testing of concrete deep foundations by ultrasonic crosshole testing deep foundations institute, manual for non destructive testing and evaluation of drilled shafts, 2004.
Crosshole sonic logging testing of drilled shafts effective. Examination of a new crosshole sonic logging system for. Comparing crosshole sonic logging and lowstrain integrity testing. If the csl records are inconclusive or show an anomaly, the engineer may require coring or the performance of crosshole tomography to verify the shaft condition.
Singlehole sonic logging ssl, crosshole tomography ct low strain testing a. Experiences with crosshole sonic logging and concrete coring for verification of drilled shaft integrity, adsc geo. This method provides little indication of concrete soundness outside the cage. The details of the crosshole tomography, if directed by the engineer, shall be. The sonic or acoustic log measures the travel time of an elastic wave through the formation. Federal highway administration, manual for drilled shafts. Provide a cross hole analyzer manufactured by pile dynamics, inc. A transmitting transducer is connected to an electrical circuit which is set. Even when defects are indeed encountered, they may. Other applications of this setup are, for example, in the field of nondestructive testing. Crosshole sonic logging test for piles free download as pdf file. Pdf the crosshole sonic logging measurement to measure the quality of bored. Pdf crosshole sonic logging and frequency tomography.
This can easily be done with a slope inclinometer or borehole deviation device. Hannan prosoil foundation consultant, dhaka1215, bangladesh p. Astm d6760 16 standard test method for integrity testing. The crosshole sonic logging system csl1 consists of 4 basic components for most testing applications.
Public roads peering into the unknown, mayjun 2009. Csl cross sonic logging method allows to determine the structural integrity and homogeneity of concrete within diaphragm walls, bored piles, drilled shafts, barrettes, concrete piles or. Experiences with cross hole sonic logging and concrete coring for verification of drilled shaft integrity, adsc geo. The csl method is based on measuring the speed of ultrasonic. Cross hole sonic logging csl has over recent years become the standard method for evaluating the integrity of bridge drilled shafts. Drilled shafts are prepared for i ntegrity testing by csl during their construction by installation of at least three tubes with a minimum inside diameter of 38mm 1. Crosshole sonic logging csl is now widely used and most common method for. The following bid items include all labor, material and equipment needed and is full compensation for the work. In order to fully evaluate shaft integrity using low strain integrity testing results, a. The crosshole sonic logging system csl1 consists of 4. The results indicate that singlehole sonic logging has a small detection range inside a bored pile, especially compared to crosshole sonic logging. Prediction of in situ rock strength using sonic velocity.
1289 1072 1429 465 96 1146 344 1058 9 1450 384 87 1663 14 473 376 565 900 1438 764 36 1281 798 1074 629 1192 300 224 705 886 1087 1208 516 1219 578 749 77 732 328 391