| 摘要 |
<p>An access pit (2) is dug at the point of access to the main pipe and is connected to a passage (52) through which is fed the branch pipe (12) that is brought to the surface at both ends (64, 62). One connects the first end (62) to a connecting piece (10). One then attaches to the main pipe (1) a framework (100) containing various guides (112a, 112b, 113a, 113b, 114a, 114b) to allow the introduction and use of various tools. The point of fixture of the branch connection on the main pipe (1) is cleaned (400), and with another tool (200) the connection is positioned on the main pipe and any slack in the branch pipe is taken up. The branch connection is then placed onto the main pipe and the other end of the branch (64) is connected up (56) and a third tool (270) is used to make the joining up of the branch (12) to the main pipe (1). The tools are then removed and the pit (2) filled in.</p> |
