Buy ASTM D R TEST METHOD FOR LOW STRAIN IMPACT INTEGRITY TESTING OF DEEP FOUNDATIONS from SAI. ASTM D compliance statement of PET – Pile echo tester. Standard Test Method for Low-Strain Impact Integrity. Testing of Deep Foundations (ASTM D ), and. Standard Test Method for High-Strain Dynamic.
|Published (Last):||17 October 2004|
|PDF File Size:||9.93 Mb|
|ePub File Size:||3.8 Mb|
|Price:||Free* [*Free Regsitration Required]|
This apparatus may receive the r after they have been processed by the apparatus for reducing the data. This test method will not give information regarding the pile bearing capacity. Piles with highly variable cross sections or multiple discontinuities may be difficult to evaluate. The force output shall be balanced to zero between impact events. When digitizing, the sample frequency, therefore, shall be at least 30 Hz each for the motion sensor and the optional instrumented hammer, if used.
NOTE 1—It is generally recommended that all components of the apparatus for obtaining dynamic measurements and the apparatus for recording, reducing, and displaying data be calibrated if any signs of system malfunctions become apparent. The apparatus shall include a graphic display of velocity and force optionaland a data storage capability for retrieving records for further analysis.
Piles that are rigidly connected to a footing or superstructure are sometimes tested successfully although the evaluation often may be more difficult and may be inconclusive. Alternatively, velocity or displacement transducers may be used to obtain velocity data, provided they are equivalent in performance to the speci? Some cases involving integral superstructures, may require use of two motion measuring devices attached at two different locations along the pile shaft.
The time domain record is then evaluated for pile integrity.
ASTM D – 07 Standard Test Method for Low Strain Impact Integrity Testing of Deep Foundations
The method is generally not suitable for testing steel sheet, H-section or un? For piles with diameters larger than mm, attach the accelerometer at a minimum of three locations so that an integrity evaluation near the pile head may be made for each localized section of pile.
Attach the motion sensor? The low strain impact should be applied to the pile head within a distance of mm from the motion sensor. The hammer must be tuned such that the fourrier transform of the measured force shall have a smooth spectrum, without any local peaks.
If the cause of poor data is not a motion sensor attachment problem but rather is found to be a transducer malfunction, repair or recalibrate it before further use. If the pile head is not accessible, as when already integral with the structure, the sensor s may be attached to the side of the pile shaft.
The combination of force and velocity may give additional information regarding the pile integrity near the pile head. Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors.
In some cases, it may 588 difficult to distinguish the soil response from the pile response. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
ASTM D5882 – 16
For both methods, data may be evaluated in both time domain and frequency domain. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. These notes and footnotes excluding those in astn and figures shall not be considered as requirements of the ashm. If damage is suspected during use, recalibrate or replace the accelerometer. For piles having minor impedance variations, the engineer should use judgement as to the acceptability of these piles considering other factors such as load redistribution to adjacent piles, ast transfer to the soil above the defect, applied safety factors, and structural load requirements.
The hammer may have a force load cell between the tip and hammer body.
These data assist evaluation of the pile cross-sectional area and length, the pile integrity and continuity, as well as consistency of the pile material, although evaluation is approximate. This standard does not purport to address all of the safety concerns, if any, associated with its use. In the time domain analysis PEMbase the pile integrity evaluation on relative increases and decreases of velocity after the initial impact pulse Asstm. Also, the test may identify minor impedance variations that may not affect the bearing capacity of the pile.
The data are evaluated usually in the frequency domain.
Integrity evaluation of a pile section below a crack that crosses the entire pile cross-sectional area or a manufactured mechanical joint asm not normally possible since the impact wave likely will re? A typical schematic arrangement for this apparatus is illustrated in Fig. The uniformity and accuracy of the digital sampling frequency is critical; the clock jitter sampling frequency accuracy must be within 0.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. This test method is applicable to long structural elements that function in a manner similar sstm any deep foundation units such as driven piles, augeured piles, or drilled shaftsregardless of their method of installation provided that they are receptive to low strain impact testing.
Last previous edition D — Current edition approved November 10, This test method will not provide information regarding the pile bearing capacity. ASTM D pile integrity testing. These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard. It is the responsibility asgm the user of this standard to establish appropriate safety and health practices and determine the applicability of ashm limitations prior to use. The apparatus shall be capable of transferring all data to a permanent storage medium.
The apparatus must have? The apparatus shall display the digitized data of the impact event or upon recall by the user of the digitally stored event. The motion sensor is placed generally near the center of the pile. Link to Active This link will always route to the current Active version of the standard.
No other units of measurement are included in this standard.
ASTM D pile integrity testing._百度文库
Average the suitable records of several impacts and apply necessary ampli? It is generally helpful to consider the soil profile, construction method and site records when evaluating data obtained by this method. Individual reprints single or multiple copies of this standard may be 588 by contacting ASTM at the above address or at phonefaxor service astm. This test method is applicable to long structural elements that function in a manner similar to foundation piles, regardless of their method of installation provided that they are receptive to low strain impact testing.