Prestressing force concrete pipe pile for low-temperature geothermal energy conversion

Abstract

The invention relates to a low-temperature terrestrial heat exchange pre-stress concrete post, which arranges pipe heat exchange devices in variable shape in the posts to carry, baffle soil and strengthen the base, while it can process low-temperature terrestrial heat exchange in lower layer to realize the function of pipe heat exchange laid by post and terrestrial heat pump prefabricated hole. In the inner hole of pre-stress concrete post operated by closed steel post sharp, the U-shape heat exchanger, screw coil-pipe heat exchanger or other pipe heat exchanger is directly laid, while the space between the inner wall of post and the pipe heat exchanger is filled by stuffing. The pipe heat exchangers in the post are connected to the ground pipe line, and the pipe line of heat exchanger is filled by exchanging liquid. The invention via the heat exchange between exchange liquid, stuffing, post, and around soil-water system, form a underground low-temperature terrestrial heat exchanger of closed terrestrial heat pump.

Description

Technical field: [0001] The invention relates to a prestressed concrete pipe pile which uses the hollow pile core of the prestressed concrete pipe pile to embed a tubular heat exchanger device to convert low-temperature geothermal energy. The device has both the bearing characteristics of the pile foundation and low-temperature geothermal energy cycle heat exchange Capability of multifunctional prestressed concrete pipe piles. Background technique: [0002] At present, the known prestressed concrete pipe piles mainly refer to pretensioned prestressed concrete annular cross-section piles. The product specifications of pipe piles mainly include prestressed high-strength concrete pipe piles (codenamed PC), prestressed concrete pipe piles (codenamed PHC), prestressed concrete thin-walled pipe piles (codenamed PTC), and the outer diameters of different types of prestressed concrete pipe piles , mechanical properties, raw materials and structure requirements, design, selection, p...

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 perfusion solid section piles (Laloui Lyesse, Moreni Matteo, Vulliet Laurent, Behavior of a bi-functional pile, foundation and heatexchanger, Canadian Geotechnical Journal, v 40, n 2, April, 2003, p 388-402.), the disadvantages of these based on drilling or embedding tubular heat exchangers in various solid section piles are: high drilling costs, solid section The construction of the coil heat exchanger in the pile is complicated, requiring processes such as coil binding and steel cage

Moreover, in all kinds of solid cross-section piles, there will be local material softening zones and stress concentration at the coil position, which will affect the quality of the pile body and have an adverse effect on the traditional bearing performance of the pile foundation.

In addition, various polyethylene tubular heat exchangers are at risk of being crushed

Images