| 摘要 |
<p>The system has two shafts connected by a dual wall double-sided, sealed sewage pipe. The sewage pipe is inserted into pipe ducts (16) formed at the shafts such that a common sealing space between seals (22, 28) is formed between the ducts and the sewage pipe. A test pipe (30) is integrated in the sewage pipe. The sewage pipe includes a plastic pipe (10) with a concrete casing (12), where the test pipe extends outwardly along the plastic pipe. The test pipe performs leakage test using testing medium e.g. water or air. The ducts are lined with a plastic layer.</p> |
