Underwater Construction Quiz

What is the main goal of dewatering in underwater construction?

• To create a barrier from the water

• To build actual dams

• To allow construction to happen safely in areas that would otherwise be infeasible or impossible to build because of water

• To divert the normal river flows around the construction site

What is a cofferdam?

• A type of underwater vehicle

• A temporary structure built to hold water back from a construction site

• A tool used for welding underwater

• A type of remote vehicle used for underwater construction

What is the purpose of a pneumatic caisson in underwater construction?

• To divert the normal river flows around the construction site

• To balance pressure from the water below and avoid seepage and soil instability

• To allow construction to happen safely in areas that would otherwise be infeasible or impossible to build because of water

• To create a barrier from the water

What is the main advantage of using drilled shafts in underwater construction?

• They can be used to divert river flows

• They do not require any dewatering

• They are easier to dismantle and remove after construction

• They are cheaper than other construction methods

What is the purpose of a tremie in underwater construction?

• To prevent the water from washing away the aggregate and diluting the cement

• To allow construction to happen safely in areas that would otherwise be infeasible or impossible to build because of water

• To divert the normal river flows around the construction site

• To create a barrier from the water

What is the main use of sheet piles in underwater construction?

• To allow construction to happen safely in areas that would otherwise be infeasible or impossible to build because of water

• To create a barrier from the water

• To drive into the subsurface soils using a huge hammer to create a watertight barrier

• To divert the normal river flows around the construction site

What is the purpose of a caisson in underwater construction?

• To balance pressure from the water below and avoid seepage and soil instability

• To divert the normal river flows around the construction site

• To allow construction to happen safely in areas that would otherwise be infeasible or impossible to build because of water

• To create a barrier from the water

What is the main challenge of using earthen embankments for dewatering?

• They are difficult to dismantle and remove after construction

• They require constant pumping to prevent seepage

• They are too expensive to build

• They are not strong enough to hold back the water

What is the main reason for the rarity of using pneumatic caissons in underwater construction today?

• They are difficult to dismantle and remove after construction

• They are not effective in dewatering

• They are too expensive to build

• They pose safety issues for workers

What is the advantage of using remote vehicles and submersibles in underwater construction?

• They are less expensive than other construction methods

• They are safer for workers than professional diving

• They can accomplish a wide variety of tasks like welding, cutting, and erecting formwork

• They are not limited in the types of tasks they can accomplish