Direct buried underground heat exchanger of engineering abandored water lowering well

Abstract

The present invention is direct buried underground heat exchanger formed through reforming used engineering precipitating well. While the engineering precipitating well after completing normal precipitating task is refilled, U-pipe heat exchanger, spiral pipe heat exchanger or other tubular heat exchanger is inserted, well closing material is filled between the well wall and the heat exchanger, heat insulating material is filled near the well top, and the heat exchanger is connected to ground pipeline. By means of pumping out water and refilling water and the underground heat exchange, a closed geothermal heat pump type underground heat exchanger is formed.

Description

Technical field: [0001] The invention relates to the combination of sealing and filling technology of scrapped dewatering wells of construction engineering and closed ground source heat pump technology, and is a direct-buried underground heat exchanger that uses tubular heat exchanger devices inserted into dewatering wells of scrapped projects to convert low-temperature geothermal energy , the device is a multifunctional direct-buried underground heat exchanger that can not only safely seal and fill the abandoned precipitation wells of construction projects, but also has low-temperature geothermal energy cycle heat exchange capabilities. Background technique: [0002] At present, known engineering dewatering wells mainly refer to tube wells serving engineering dewatering, and their use time limit is limited, generally ending with the completion of the main project or excavation engineering construction. The discarded precipitation wells must be sealed and filled in time, oth...

AI Technical Summary

Problems solved by technology

Although some people in foreign countries have mentioned the concept of pile-buried heat exchangers, they are all based on high-strength polyethylene U-shaped coil concrete poured solid section piles (Laloui Lyesse, Moreni Matteo, Vulliet Laurent, Behavior of a bi-functional pile, foundation and heat exchanger, Canadian Geotechnical Journal, v 40, n 2, April, 2003, p 388-402.), these disadvantages based on drilling or embedding tubular heat exchangers in various concrete pouring piles are: high drilling costs, The construction of the coil heat exchanger in the concrete pouring pile is complicated, requiring processes such as coil binding and steel cage

It only considers that the tubular heat exchanger is a set of U-shaped coils or open tube-like tubular heat exchangers. Their heat exchanger efficiency is not high, and no backfill material is added to the hollow pile core of the pipe pile. , which directly affects the heat transfer efficiency with the soil layer

In addition, when pipe piles are used as enclosure piles or pile tops near the surface, the problem of pipeline insulation near the surface in winter is not considered

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