| 摘要 |
PURPOSE: A sealed upper protection hole recirculation header apparatus for an open type underground heat exchanger is provided to reinforce the watertight seal of a recirculation tube. CONSTITUTION: A sealed upper protection hole recirculation header apparatus for an open type underground heat exchanger comprises a grouting casing(20), a recirculation header(70), a lower shield unit, a recirculation tube(8), an inner well member(4), and a sealed upper protection hole(3). The grouting casing is inserted in an excavated hole for a subsurface protection wall of an underground well. The recirculation header is composed of an outer pipe and an inner pipe which form a compartment with top and bottom closed, and the recirculation tube and a recirculation pipe(10) are connected to the recirculation header. The lower shield unit connects the recirculation tube to the recirculation header. The inner well member is connected to the inner pipe. The sealed upper protection hole is connected to the top of the recirculation header. |
