| 摘要 |
This tube is made up of tubular elements (2a, 2b) coupled coaxially to one another and bearing on the upper wall (7b) of a box (7) containing the buried valve (3) of a pipeline (main) (4). According to the invention, each tubular element (2a, 2b) comprises, at one of its ends, a swelling (10) allowing it to be engaged over the non-swelled end of another tubular element (2a, 2b) which is consecutive with it and at the free end of which is equipped with an annular collar (11), the element (2b) closest to the box (7) coming to rest on the upper wall (7b) of the latter by virtue of this collar (11) and including a sleeve tube (12) fixed to it, engaged on the one hand in the cavity delimited by the said swelling (10) and, on the other hand, through the opening formed for this purpose in the wall (7b) of the box (7). <IMAGE>
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