Search results
Results From The WOW.Com Content Network
The guide walls are constructed near the ground surface to outline the desired slurry trench, and to guide the excavation machinery. Excavation is done using a special clamshell-shaped digger or a hydromill trench cutter, suspended from a crane. The excavator digs down to design depth (or bedrock) for the first wall segment. The excavator is ...
Bentonite slurry walls (also known as diaphragm walls [43]) are used in construction, where the slurry wall is a trench filled with a thick colloidal mixture of bentonite and water. [44] A trench that would collapse due to the hydraulic pressure in the surrounding soil does not collapse as the slurry balances the hydraulic pressure.
The hydromill trench cutter is a specialized type of construction equipment designed to dig the narrow but deep trenches used in the casting of slurry walls. Typically, it is a cutter attachment mounted on a crawler crane base machine, with different types of hose handling systems. The machine excavates by cutting the soil using two cutting ...
A slurry wall is a barrier built under ground using a mix of bentonite and water to prevent the flow of groundwater. A trench that would collapse due to the hydraulic pressure in the surrounding soil does not collapse as the slurry balances the hydraulic pressure.
Tiebacks to reinforce a slurry wall at Ground Zero, New York. A tieback is a structural element installed in soil or rock to transfer applied tensile load into the ground. . Typically in the form of a horizontal wire or rod, or a helical anchor, a tieback is commonly used along with other retaining systems (e.g. soldier piles, sheet piles, secant and tangent walls) to provide additional ...
The trench is then carefully back-filled and the surface is reinstated. Top-down method: Side support walls and capping beams are constructed from ground level by such methods as slurry walling or contiguous bored piling. Then a shallow excavation allows making the tunnel roof of precast beams or in situ concrete.
Permeable reactive barrier. A permeable reactive barrier (PRB), also referred to as a permeable reactive treatment zone (PRTZ), is a developing technology that has been recognized as being a cost-effective technology for in situ (at the site) groundwater remediation. PRBs are barriers which allow some—but not all—materials to pass through.
Digging a large trench to the bedrock risked flooding from nearby New York Harbor. The solution employed by Yamasaki and his team of engineers was to use a slurry wall; digging very narrow trenches about 3 feet (0.91 m) wide and then filling these with a slurry (a mixture of clay and water) that was dense enough to keep the surrounding water ...