System for detecting integrity of grouting pile foundations based on distributed optical fiber temperature sensing technology

Abstract

The invention discloses a system for detecting integrity of grouting pile foundations based on a distributed optical fiber temperature sensing technology, and relates to an integrity detecting technology of the grouting piles. The structure of the system is characterized in that a sensing optical fiber (20) is grouted in the grouting pile (00); and a heating device (30), a distributed optical fiber temperature measuring instrument (10) and an integration elevation device (40) of the grouting pile are connected from front side to back side in turn. The sensing optical fiber (20) is heated via the heating device (30), the sensing optical fiber (20) senses the temperature of the pile foundation, the distributed optical fiber temperature measuring instrument (10) measures the temperature, and the integration elevation device (40) of the grouting pile converts the temperature value into the integration. The system disclosed by the invention can effectively and quickly detect the integration of the grouting pile foundations, and can monitor the integration of the grouting pile foundations in real time on line for a long time; the detection is simple, so that the requirements for each grouting pile foundation can be met; and the system can be applied to the detection for the integration of various grouting pile foundations.

Description

technical field [0001] The invention relates to a detection technology of cast-in-situ pile foundation, in particular to a detection system for the integrity of cast-in-situ pile foundation based on distributed optical fiber temperature sensing. Background technique [0002] Integrity detection of cast-in-situ pile foundation is a crucial inspection item to ensure the stability of cast-in-situ pile foundation and the safety of superstructure structure. At present, there are 4 kinds of detection methods that are widely used: acoustic transmission method, core drilling method, high strain method and low strain method. [0003] 1. Acoustic transmission method [0004] The integrity of cast-in-situ piles can be judged by observing and analyzing acoustic parameters such as the propagation velocity, amplitude and frequency of sound waves in different media. This method can carry out comprehensive and detailed detection, and there are basically no other restrictions. However, du...

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Problems solved by technology

This method has a clear mechanism, simple test method, reliable results, and low cost. However, when the concrete at the pile head is soft, the stress wave cannot propagate from the pile head along the pile body to the pile bottom, and the reflected signal of the pile cannot be obtained; When there are one or more defects, it is not easy to detect the subsequent defect reflection signals; when the pile body defects change slowly (such as neck expansion or necking), the reflection signals at the defect change interface are not obvious, which is easy to cause misjudgment Or missed judgment; affected by the length-to-diameter ratio of piles, sensitive to deep defects, etc., only qualitative analysis of defects can not be quantitatively analyzed

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