The invention discloses a
precession-type backfill grouting ground source
thermal energy conversion precast
pile device, which comprises a plurality of
precession-type backfill grouting prefabricated screw piles respectively embedded into
pile holes, wherein a vertical
heat exchanger is embedded in each screw
pile; the inlet end and the outlet end of each vertical
heat exchanger respectively extend out of an opening at the upper end of the screw pile to be respectively connected with a horizontal liquid-feeding collecting
pipe and a horizontal liquid outlet collecting
pipe in a bearing platform or a
cushion layer;
centring brackets are arranged at an interval of 1-3 m along the length direction of each vertical
heat exchanger; each
precession-type backfill grouting prefabricated screw pile comprises a hollow pile core, wherein the bottom of the pile core is provided with a cone-shaped pile head; a screw blade is arranged on the position far away1-3m from the lower part of the outer wall of the pile core; and a post grouting reinforcing layer is poured between the middle upper part of the outer wall of the pile core and a pile hole wall. The precession-type backfill grouting ground source
thermal energy conversion precast pile device comprises a plurality of precession-type backfill grouting prefabricated screw piles, and the vertical heat exchanger is embedded in each screw pile; the pile foundation construction and the ground source
heat pump construction are integrated so as to avoid a drilling and
pipe-laying program of a ground source
heat pump system on the ground, greatly lower the front-end
investment cost and save the
land use area; and the post grouting reinforcing layer is poured between the middle upper part of the outer wall of the pile core and the pile hole wall so as to enlarge a heat conduction area, improve the heat conduction performance and simultaneously improve the pile body
bearing capacity.