| 摘要 |
<p>The construction has an excavating chain front (10) which provides a first upper layer of the substructure. A rear digging chain (80) is directed to work behind the front digging chain and arranged below the first upper layer. A second transfer body (70) is arranged in the direction of work after the first injection and compression facility is provided and dumps ballast. A digging chain (30) is arranged between the front and rear of the excavating chain to ensure that between the first upper layer and lower layer an intermediate layer is provided.</p> |
