Marine Construction

Marine ConstructionSCM 330

Tyler Mason Pratt

Tyler Mason Pratt

Overview

Cofferdams

Barges

Dredgers

Conclusion

Today’s Agenda

• Overview• Cofferdams• Barges• Dredgers• Conclusion

Marine Construction

Tyler Mason Pratt

Marine Construction

Tyler Mason Pratt

Overview of Marine ConstructionOverview

Cofferdams

Barges

Dredgers

Conclusion

Marine construction is a unique specialization in the construction industry that is forced to utilize means and methods unlike any other in the field of development. Building on a body of water (or even near a body of water) completely restructures how a project is approached. A successful marine project requires rare tools and practices. Cofferdams, Barges, and Dredgers are tools that have completely reshaped the Marine Construction industry.

Marine Construction

Tyler Mason Pratt

Cofferdams Overview

Cofferdams

Barges

Dredgers

Conclusion

What is a Cofferdam?A watertight enclosure from which the water is pumped to expose the bottom of a river, lake, ocean, etc. and permit work to be done there.

Is a retaining structure, usually temporary in nature, which is used to support the sides of deep excavations or work areas in the water.

Marine Construction

Tyler Mason Pratt

Types of Cofferdams Overview

Cofferdams

Barges

Dredgers

Conclusion

•Braced•Earth-Type•Timber Crib•Double-Walled Sheet Pile•Cellular•Slurry Wall•Specialty – Steel Framed, Inflatable

Marine Construction

Tyler Mason Pratt

Braced Cofferdams

•Formed from a single wall of sheet piling•Driven into the ground to form a box around the excavation site•The “box” is then braced on the inside •Interior is dewatered •Primarily used for bridge piers in shallowwater (30 - 35 ft depth)

Overview

Cofferdams

Braced

Cellular

Barges

Dredgers

Conclusion

Marine Construction

Tyler Mason Pratt

How it Works Overview

Cofferdams

Braced

Circular

Barges

Dredgers

Conclusion

Marine Construction

Tyler Mason Pratt

Overview

Cofferdams

Braced

Cellular

Barges

Dredgers

Conclusion

Cellular Cofferdam

•Circular cells are connected by diaphragms•Deep excavations•Used when the construction area is very large•Also used when internal bracing is impractical

Marine Construction

Tyler Mason Pratt

BargesOverview

Cofferdams

Barges

Dredgers

Conclusion

A barge is a large flat bottomed boat primarily used to, but not limited to, the transportation of materials and equipment. Most barges are not self propelled and require the use of tugboats to push or pull them

Marine Construction

Tyler Mason Pratt

Types of BargesOverview

Cofferdams

Barges

Dredgers

Conclusion

•Derrick Barges•Jack-Up Barge•Material Barges•Dump Scows•Hopper Barge•Flexi Floats•Semi-Submersible

Marine Construction

Tyler Mason Pratt

Jack-Up BargeOverview

Cofferdams

Barges

Jack-Up Barge

Hopper Barge

Dredgers

Conclusion

•A large barge with 4-8 legs lifting it up over the water.•Legs are lowered to sea floor and lift the deck of the barge up.

Marine Construction

Tyler Mason Pratt

How it WorksOverview

Cofferdams

Barges

Jack-Up Barge

Hopper Barge

Dredgers

Conclusion

Marine Construction

Tyler Mason Pratt

UsesOverview

Cofferdams

Barges

Jack-Up Barge

Hopper Barge

Dredgers

Conclusion

•These barges provide a stable platform for construction activities.•The platform allows materials to be placed on a flat surface.•Also provides a stable surface to conduct boring and piling.•Cranes an other various equipment is mounted to the platform.

Marine Construction

Tyler Mason Pratt

Hopper BargeOverview

Cofferdams

Barges

Jack-Up Barge

Hopper Barge

Dredgers

Conclusion

•Used for transport of dry materials such as: gravel, sand, rock, etc.•Barges are usually moved with tugboats or are self propelled.

Marine Construction

Tyler Mason Pratt

UsesOverview

Cofferdams

Barges

Jack-Up Barge

Hopper Barge

Dredgers

Conclusion

•Typically flat, long and open top.•Used for transportation of dry materials from land to location of construction.•Also used for transportation of materials dredged or removed from construction site.

Marine Construction

Tyler Mason Pratt

DredgersOverview

Cofferdams

Barges

Dredgers

Conclusion

•A dredger is an ocean vessel equipped with a mechanism that collects material from the sea floor. •It’s an excavation activity or operation carried in shallow seas or fresh water areas with the purpose of gathering up bottom sediments and disposing of them at a different location

Marine Construction

Tyler Mason Pratt

UsesOverview

Cofferdams

Barges

Dredgers

Conclusion

•Normally it is carried out to create a new harbor, or to deepen existing facilities in order to allow larger ships access. •Dredging is a process that can be used to maintain the depth and width of existing water ways. The Sand spit at Morro Bay is dredged on a regular basis to keep access for small vessels available.

Marine Construction

Tyler Mason Pratt

Types of DredgersOverview

Cofferdams

Barges

Dredgers

Conclusion

•Mechanical Dredgers• Clam Bucket• Dipper Dredge• Ladder Dredge•Hydraulic Dredgers• Plain Suction• Cutter Head

Marine Construction

Tyler Mason Pratt

Clam BucketOverview

Cofferdams

Barges

Dredger

Clam Bucket

Plain Suction

Conclusion

Definition: A crane or derrick mounted on a floating platform that uses a clamshell or dragline procedure to remove sediment.

Marine Construction

Tyler Mason Pratt

Plain SuctionOverview

Cofferdams

Barges

Dredger

Clam Bucket

Plain Suction

Conclusion

◦Operates like a vacuum cleaner. ◦Lifts up loose sediment and carries it

through a long pipe until discharged.

Marine Construction

Tyler Mason Pratt

How it WorksOverview

Cofferdams

Barges

Dredger

Clam Bucket

Plain Suction

Conclusion

Marine Construction

Tyler Mason Pratt

ConclusionOverview

Cofferdams

Barges

Dredger

Conclusion

Using these different pieces of equipment and following these practices are always required in the development of large structures at sea. Without these methods building a simple pier would be impossible. Innovation and creativity are obviously two of the main features that govern the success of a marine project. Development on a body of water can be a pain but it is necessary to keep trade and transportation flowing.