| 摘要 |
<p>The production process is for underground collectors used for the extraction or storage of heat energy. The necessary hoses and pipes for the heat-transfer fluid are inserted in the ground by a horizontal boring machine of the impact type at the desired depth. The system avoids the need for excavating and backfilling large quantities of earth, or for disturbing the surface. The horizontal boring machine may be installed in a cellar in a house during use, or may be accommodated in a small pit near the house.</p> |
