Research and application of key technology and equipment for reconstruction and expansion of large water transfer canal projects

The reconstruction and extension project of the long-distance water transfer canal in Northern Xinjiang is key to water delivery efficiency and project safety. In order to solve the existing problems of expansive soil, the new and old anti-seepage geomembrane connection, easy deformation of drainage pipes, and labor force shortage, the multi-functional gapping machine, concrete surface molding machine and other integrated machines were developed, construction efficiency and project safety were enhanced, and the demanded labors were sharply reduced. The KS hot melt adhesive bonding and inner tube spinning geomembrane technology were developed by laboratory test and field demonstration, which ensured the efficient connection of new and old impermeable geomembranes. The deformation resetting device of deeply buried underground hose was developed, through which the blockage of the water body in the foundation of the canal could be unclogged quickly, thus avoiding large excavation and providing support for the long-term safe operation of the channel. A series of equipment and technologies have been demonstrated and applied in the north Xinjiang water supply project, and produced great social and economic benefits. The research results have important reference values to the reconstruction and expansion of similar channel projects.