| 摘要 |
<p>PURPOSE: To reduce a term of constructing a duct by inserting an air-hose connecting a penetrating machine or the like into a duct body to be buried, operating the penetrating machine by compressed air to drive forward, and driving the duct body following the penetrating machine forward. CONSTITUTION: An air-hose 2 is inserted into a duct body 10 to be newly buried. The inserted air-hose 2 is connected to a casing main body 1 of a penetrating machine 13 and an air-compressor. Then a tip section of the head of the duct body 10 is contacted through a connecting unit U to the casing main body 1. Compressed air from the air-compressor is supplied to the casing main body 1 of the penetrating machine B and the penetrating machine B is operated impacting by the compressed air to drive forward under the ground. A penetration hole is drilled by the connecting unit of the penetrating machine B thereby, and s newly provided duct body is driven forward by the driving of the of penetrating machine so as to reduce a term of constructing the duct.</p> |
