English：

In view of the construction problems in water-rich sand stratum, low-clearance diaphragm wallunder viaduct and high-tension lines, a full set of low-clearance grooving and hoisting equipment isadopted, and technical and management measures are taken in two aspects: Speeding up section hoistingand ensuring the stability of the trough wall, optimizing the performance indicators of the wall protectionmud, doing a good job in process organization, re-section the steel bar cage as a whole, and controllingthe verticality of the section butt. The use of gravel backfill to prevent joint flow around, the use of three-pipe pouring, and the use of physical defense, technology, civil air defense and other measures toprevent collision with the overhead viaduct and high-voltage lines, fully ensure the safety and quality ofthe construction of low-clearance diaphragm wall in the water-rich sand stratum, and effectively improvethe average efficiency.