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):||19 August 2004|
|PDF File Size:||9.63 Mb|
|ePub File Size:||6.41 Mb|
|Price:||Free* [*Free Regsitration Required]|
A hammer with a very hard plastic tip can induce a short input force pulse without causing local pile damage. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices 55882 determine the applicability of regulatory limitations prior to use. Position the apparatus for applying the impact force so that the impact is applied axially with the pile and at a distance no larger than mm from the accelerometer.
This test method will not give information regarding the pile bearing capacity. How one applies the results obtained using this standard is beyond its scope.
The apparatus shall be able to apply increasing intensity ampli? Adjust the apparatus to reproduce a signal having atm range of duration between 2 ms and 30 ms. A contingency plan should be formed that allows the engineer to possibly perform further tests or dictate pile repair or replacement prior to the integrity testing, in case a serious defect is indicated.
When digitizing, the sample frequency, therefore, shall be at least 30 Hz each for the motion sensor and the optional instrumented hammer, if used. Link to Active This link will always route to the current Active version of the standard.
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, load transfer to the soil above the defect, applied safety factors, and structural load requirements. In some cases, it may be difficult to distinguish the soil response from the pile response. How one applies the results obtained using this standard is beyond its scope.
A typical schematic arrangement for this apparatus is illustrated in Fig. Visual interpretation may be qualitative and possibly relative to other tested piles and a matter of proper engineering judgment.
Consistent records are the result of uniform impacts on sound concrete, transducer systems that are properly functioning, motion sensors that are? Alternatively, the hammer may have an accelerometer attached and the measured acceleration may be converted to force using the hammer mass. A number in parentheses indicates the year of last reapproval.
Average the suitable records of several impacts and apply necessary ampli? The method is generally not suitable for testing steel sheet, H-section or un?
The motion during the impact event is normalized usually and is associated with the pile head. The data are evaluated usually in the frequency domain. The time domain record is aatm evaluated for pile integrity. Do not use the records of impacts that cause the measurement device to overload.
Attached to every digitized event should astj identifying information names and descriptions, signal processing enhancement parameters, and date and time stamps. Accelerometers shall be linear to at least 50 g. Attach the motion sensor? This standard does not purport to address all of the safety concerns, if any, associated with its use. Ensure that the apparatus is capable of displaying the signal from each selected blow for a minimum period of 30 s.
The apparatus shall display the digitized data of the impact event or upon recall by the user of the digitally stored asstm. The apparatus shall include a graphic display of velocity and force optionaland a data storage capability for retrieving records for further analysis. 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.
Your comments are invited either for revision of this standard or for additional dd and should be addressed to ASTM Headquarters.
Alternately, the pile head force can be measured as well. The impact should be applied axially to the pile normally on the pile head. In the time domain analysis PEMbase the pile integrity evaluation aztm relative increases and decreases of velocity after the initial impact pulse Fig.
Link to Active This link will always route to the current Active version of the standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to 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. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Use integrity evaluation from low strain tests together with other information, including pile installation procedures and observations, soil information, loading requirements, etc. Ensure that the apparatus for recording, reducing, and displaying data is capable of determining the measurement device overload threshold.
The force output shall be 5828 to zero between impact events. Take, record, and display a series of velocity and force optional measurements. The uniformity and accuracy of the digital sampling frequency is critical; the clock jitter sampling frequency accuracy must be within 0. The accelerometer s should be placed at or near the pile head and shall have their sensitive axis parallel with the pile axis.
Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. If damage is suspected during use, recalibrate or replace the accelerometer.