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Technology
Dynamic development of the construction industry in Russia and an infill construction in major cities require the use of new high-tech methods in the field of underground construction works.
Technologies
1. An in-situ reinforced concrete guide wall is built across the future excavation. This guide wall outlines a desired slurry trench and a guide excavation, required wall building accuracy, and prevents walls from collapsing.
2. A trench is designed for the wall. Excavation is performed using a special clamshell-shaped hydraulic digger. During the excavation, the trench is filled with bentonite grout to prevent collapse.
3. Then the excavated trench is prepared for concreting. Specially prepared reinforcing cages are placed in a vertical position and lowered into the trench. After reinforcement has been assembled, tremie pipes are lowered into the trench as well.
4. The trench is filled with concrete. The concrete displaces the bentonite grout, which is then pumped out and recycled. The rate of pour is 20 – 30 m3 per hour.
5. Performing of soil excavation and wall shoring. The excavation is developed by making layers.
2. A trench is designed for the wall. Excavation is performed using a special clamshell-shaped hydraulic digger. During the excavation, the trench is filled with bentonite grout to prevent collapse.
3. Then the excavated trench is prepared for concreting. Specially prepared reinforcing cages are placed in a vertical position and lowered into the trench. After reinforcement has been assembled, tremie pipes are lowered into the trench as well.
4. The trench is filled with concrete. The concrete displaces the bentonite grout, which is then pumped out and recycled. The rate of pour is 20 – 30 m3 per hour.
5. Performing of soil excavation and wall shoring. The excavation is developed by making layers.
Technology advantages
“Slurry wall” is a special technology which allows to perform the underground constructions in a close proximity to the existing buildings and constructions as well as the working factories. Slurry walls make it possible to enclose excavations in restrained urban conditions and close to communications.
This technology is mainly used to restore historical monuments, develop underground space below water table in order to create ground water cutoff in hydraulic structure foundations. This type of enclosure is made through extracting soil while the trench is kept filled with bentonite grout. Then a reinforcing cage is lowered into the trench and the bentonite grout is replaced with concrete. This technology makes it possible to use the slurry wall as a bearing construction or as a construction to restrict groundwater flow to embedded structures.
This technology is mainly used to restore historical monuments, develop underground space below water table in order to create ground water cutoff in hydraulic structure foundations. This type of enclosure is made through extracting soil while the trench is kept filled with bentonite grout. Then a reinforcing cage is lowered into the trench and the bentonite grout is replaced with concrete. This technology makes it possible to use the slurry wall as a bearing construction or as a construction to restrict groundwater flow to embedded structures.