1.1 本试验方法涵盖了检查深层基础（如钻孔桩、钻孔桩、混凝土桩或螺旋钻孔桩）中混凝土的均匀性和完整性的程序。该方法也可以扩展到地下连续墙、桩、大坝等。在该试验方法中，上述所有构件都将被指定为“深基础构件”该测试测量了超声波脉冲在平行接入管道（跨孔）之间或安装在深基础元件中的单管（单孔）中的传播时间和相对能量。当在施工期间安装的管道中执行时，此方法最适用。 1.2 存在具有不同激励源的类似技术，但这些技术不在本试验方法的范围内。 1.3 所有观察值和计算值应符合实践中确定的有效数字和舍入准则 D6026 . 1.4 在本试验方法中，用于指定数据收集、计算或记录方式的方法与数据可用于设计或其他用途或两者的准确性没有直接关系。如何应用使用本标准获得的结果超出了其范围。 1.5 本标准规定了混凝土深基础构件的跨孔（或单孔）测试的最低要求。由合格工程师编制并经要求测试的机构批准的计划、规范、规定或其组合，可根据需要提供额外的要求和程序，以满足特定测试计划的目标。 1.6 本标准的文本引用了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本标准的要求。 1.7 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.8 限制- 正确安装接入管道对于有效测试和解释至关重要。该方法没有给出缺陷的确切类型（例如，夹杂物、蜂窝状、缺乏水泥颗粒等），而只是说明存在缺陷。 1.9 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 5.1 该方法使用从放置在深基础元件中的平行通道或单个通道中的超声波探头获得的数据来评估探头之间混凝土的均匀性和完整性。 这些数据用于确认足够的混凝土质量或确定质量较差的区域。如果检测到缺陷，则应通过开挖或取芯混凝土（视情况而定）或其他测试（如试验方法）进行进一步调查 D1143 , D4945 或 D5882 ，以及在确认缺陷时为补救结构而采取的措施。 5.2 限制: 5.2.1 对于跨孔测试，接入管道最好由钢制成，以防止接入管道与混凝土脱粘，从而导致异常。该测试可以评估主要在接入管道周围区域（通常指钢筋笼内）的混凝土完整性。 5.2.2 对于单孔测试，接入管必须为塑料管。因此，应尽快进行测试，以避免脱粘问题。 由于产生的波浪穿过入口管道周围的混凝土，除非缺陷足够大且非常靠近入口管道，否则可能无法通过该方法检测到。 注1: 本标准产生的结果的质量取决于执行该标准的人员的能力，以及所用设备和设施的适用性。符合实践标准的机构 D3740 通常认为能够进行合格和客观的测试和检查。本标准的用户应注意遵守惯例 D3740 本身并不能保证可靠的结果。可靠的结果取决于许多因素；实践 D3740 提供了一种评估其中一些因素的方法。

1.1 This test method covers procedures for checking the homogeneity and integrity of concrete in deep foundation such as bored piles, drilled shafts, concrete piles or augercast piles. This method can also be extended to diaphragm walls, barrettes, dams etc. In this test method, all the above will be designated “deep foundation elements.” The test measures the propagation time and relative energy of an ultrasonic pulse between parallel access ducts (crosshole) or in a single tube (single hole) installed in the deep foundation element. This method is most applicable when performed in tubes that are installed during construction. 1.2 Similar techniques with different excitation sources exist, but these techniques are outside the scope of this test method. 1.3 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 . 1.4 The method used to specify how data are collected, calculated, or recorded in this test method is not directly related to the accuracy to which data can be applied in design or other uses, or both. How one applies the results obtained using this standard is beyond its scope. 1.5 This standard provides minimum requirements for crosshole (or single hole) testing of concrete deep foundation elements. Plans, specifications, provisions, or combinations thereof prepared by a qualified engineer, and approved by the agency requiring the test(s), may provide additional requirements and procedures as needed to satisfy the objectives of a particular test program. 1.6 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.8 Limitations— Proper installation of the access ducts is essential for effective testing and interpretation. The method does not give the exact type of flaw (for example, inclusion, honeycombing, lack of cement particles, etc.) but rather only that a flaw exists. 1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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. ====== Significance And Use ====== 5.1 This method uses data from ultrasonic probes lowered into parallel access ducts, or in a single access duct, in the deep foundation element to assess the homogeneity and integrity of concrete between the probes. The data are used to confirm adequate concrete quality or identify zones of poor quality. If defects are detected, then further investigations should be made by excavation or coring the concrete as appropriate, or by other testing such as Test Method D1143 , D4945 or D5882 , and measures taken to remediate the structure if a defect is confirmed. 5.2 Limitations: 5.2.1 For crosshole tests, the access ducts should preferably be made of steel to prevent debonding of the access duct from the concrete resulting in an anomaly. This test can assess to the integrity of the concrete mainly in the area bounded by the access ducts, which means typically inside the reinforcement cage. 5.2.2 For single hole tests the access tubes must be plastic tubes. Testing should therefore be performed as soon as practical in order to avoid debonding issues. Since the generated waves travel through the concrete around the access duct, unless a flaw is massive enough and very near to the access duct it may not be detected by this method. Note 1: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing and inspection. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.