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.
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Set up the apparatus for recording, reducing, and displaying data so that it is operational and the force and velocity signals are zeroed.
The apparatus shall balance the velocity signal to zero between impact events. The apparatus should be capable of averaging data of several blows to reinforce the repetitive information from soil and pile effects while reducing random noise effects. 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.
The hammer must be tuned such that the fourrier transform of the measured force shall have a smooth spectrum, without any local peaks. This standard does zstm purport to address all of the safety concerns, if any, associated with its use.
The low strain impact should be applied to the pile head within a distance of mm from the motion sensor. The force output shall be balanced to zero between impact events.
ASTM D – 07 Standard Test Method for Low Strain Impact Integrity Testing of Deep Foundations
Individual reprints single or multiple copies of asstm standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Referenced Documents purchase separately The documents listed below astk referenced within the subject standard but are not provided as part of the standard.
The records from the individual impacts or the averaged record, or both, should then be stored see 5. The hammer may have a force load cell between the tip and hammer body. If the pile head is contaminated, remove a sufficient pile section to reach sound concrete.
The low strain integrity evaluation should not 5828 used as the sole factor in establishing pile acceptance or rejection. If necessary, prepare small areas by a 582 grinder to provide a smooth surface for motion sensor attachment and impact. The combination of force and velocity may give additional information regarding the pile integrity near the pile head. Users of this test method are cautioned that compliance with Practice D does not in itself assure reliable results.
This limitation may apply to long or highly variable piles or piles in soils that exhibit relatively high friction.
ASTM D 5882-16 Compliance Statement
Historical Version s – view previous versions of standard. The apparatus asstm have? 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. The displayed data should include the velocity and force optional records with time, an indication of the pile length and assumed material wave speed and a representation of the shape and magnitude of the ampli?
In the time domain analysis PEMbase the pile integrity evaluation on relative increases and decreases of velocity after the initial impact pulse Fig.
This test method will not provide information regarding the pile bearing capacity.
ASTM D pile integrity testing._百度文库
The apparatus shall include a graphic display of velocity and force optionaland a data storage capability for retrieving records for further analysis.
The apparatus shall be capable of transferring all data to a permanent storage medium. Take, record, and dd a series of velocity and force optional measurements.
Link to Active This link will always route to the current Active version of the standard. Some cases involving integral superstructures, may require use of two motion measuring devices attached at two different locations along the pile shaft.
Consistent records are the result of uniform impacts on sound concrete, transducer systems that are properly functioning, motion sensors that are? The motion during the impact event is normalized usually and is associated with the pile head.
Adjust the apparatus to reproduce a signal having a range of duration between 2 ms and 30 ms. This test 58822 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.
If damage is suspected during use, recalibrate or replace the accelerometer. 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. These limitations must be understood and taken into FIG. Historical Version s – view previous versions of standard Translated Version sstm This test method is applicable to long structural elements that function in 58882 manner similar to 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.
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.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? In some cases, it may be difficult to distinguish the soil response from the pile response.
A number in parentheses indicates the year asfm last reapproval. Users of this standard are expressly advised that determination of the validity of any such v rights, and the risk of infringement of such rights, are entirely their own responsibility.
Piles with highly variable cross sections or multiple discontinuities may be difficult to evaluate. The data are evaluated usually in the frequency domain. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The results of the analysis may include a quantitative assessment of pile integrity. The impact should be applied axially to the pile normally on the pile head. Asfm the suitable records of several impacts and apply necessary ampli?
Qstm the motion sensor?