| 摘要 |
<p>The procedure for the maintenance and/or putting into service of valve pipe boring boxes laid in the ground, whereby access is through at least one chamber screened for this period in relation to the ground, entails the creating of the necessary cavity for the making of this chamber by wash drilling carried out inside a flushing pipe (1). The wash drilling is carried out with water inside the flushing pipe, with the introducing of the water with an overpressure. An independent claim is included for a device for carrying out the proposed procedure using a flushing pipe which is used as a guiding and/or fastening element for additional elements of the device.</p> |
