Rock-soil thermal response test hole buried pipe backfilling and compactness detection processing method

Abstract

The invention relates to a rock-soil thermal response test hole buried pipe backfilling and compactness detection processing method, and belongs to the field of new energy. The method comprises the following steps that after a plurality of test holes are formed, a buried pipe is tripped into the hole bottom, and a grouting pipe with the pipe diameter slightly larger than that of the buried pipe and the length equal to that of the buried pipe is further included; injecting the prepared backfill slurry into the bottom of the hole through a grouting pipe, and returning the backfill slurry to theground through an annulus between the grouting pipe and the wall of the hole; the backfill slurry in the grouting pipe is jacked into the annulus through clear water, and preliminary backfill is completed; a radar is put into the hole from the grouting pipe, a radar detection profile of the test hole is generated in the lifting process from bottom to top, and the depth of the cavity or the honeycomb section and the orientation in the test hole are determined; a perforating gun is put into a grouting pipe, a perforating gun emitting hole faces the cavity or the honeycomb section, and perforating is conducted in the preset depth and the preset direction; and finally, backfill slurry is injected into the grouting pipe again, and the backfill slurry enters the cavity or the honeycomb section through the perforation channel.

Description

technical field [0001] The invention relates to a method for backfilling an underground pipe in a thermal response test hole of rock soil and detecting and processing the compactness, and belongs to the field of new energy. Background technique [0002] Before the design and construction of the ground source heat pump buried pipe system, it is necessary to conduct a thermal response test of the rock and soil to obtain the heat transfer coefficient of the formation, the heat exchange power per meter of the buried pipe in winter and summer, and other parameters. Whether these parameters are obtained accurately or not, It is of great significance to the design and construction of the whole system. An important factor to determine the accuracy of the test results of thermal response of rock and soil is whether the backfill compactness of the vertical buried pipe meets the requirements. [0003] In the process of backfilling the geotechnical thermal response test hole with the t...

AI Technical Summary

Problems solved by technology

Although the present invention may increase the cost of thermal response testing, since the number of holes that need to be tested before the design and construction of a ground source heat pump system is usually small, it can provide more accurate parameter basis for the design and construction of the entire system, and can also achieve higher cost-benefit ratio

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