BUILDING METHOD FOR PIPELINE INCLUDING MINITUNNEL Russian patent published in 2005 - IPC

FIELD: building, namely underground structure erection, particularly for building multipurpose pipelines under acting roads without traffic interruption and in difficult mining and geological conditions and in presence of watered tunnel base ground.

SUBSTANCE: method involves forming minitunnel by successive driving hollow reinforced concrete sections in ground and/or embankment along with simultaneous supplying thixotropic mix; connecting above sections one to another and to neighboring pipeline sections during driving thereof. Pipeline sections have opened end parts. One end part has annular grove opened from section end for receiving metal shell extending out of the section end and having thickness of not more than groove depth. Shell and end section part form stepped funnel. The second section end part tapers in stepwise manner to end thereof to form bush part having one step for shell of neighboring section receiving. The second section end part is provided at least with one step for gasket. Gasket is made of pliable sealing gas-and waterproof material and bearing against step surface by one gasket side and against inner shell surface by another side thereof. Steps of bush part are formed within half of thickness of section wall facing outwards, wherein neighboring sections are located so that gaps are formed between ends thereof. Compression ring and additional gasket abutting compression ring are installed in above gap. Additional gasket is made of pliable gas- and waterproof material and bears against inner shell surface by outer ring side and to neighboring section ends by end surface thereof. Length of bush part exceeds that of adjoining part of metal shell. End parts of pipeline sections adjacent to minitunnel mate neighboring end parts of minitunnel or adapter and/or inserted sections are used for pipeline and minitunnel connection. Pipeline is connected to minitunnel after driving the last pipeline section.

EFFECT: reduced material consumption, labor inputs and time required for pipeline laying; increased service life and economy.

8 cl, 16 dwg