What does cofferdam mean?
What does cofferdam mean?
1 : a watertight enclosure from which water is pumped to expose the bottom of a body of water and permit construction (as of a pier) 2 : a watertight structure for making repairs below the waterline of a ship.
What is meant by a coffer dam?
A cofferdam is a watertight, temporary, dam-like structure that is installed to enclose an area that is submerged under water to create dry conditions for workers to carry out their work.
Where does the word cofferdam come from?
Cofferdam detailed word origin explanation (South Africa, Australia) A reservoir.. (dentistry) A device to prevent a tooth from getting wet, consisting of a rubber sheet held with a band.. A firebrick wall, or a stone, which forms the front of the hearth of a blast furnace..
What are cofferdams used for?
What is a Cofferdam? A cofferdam is a structure that retains water and allows a work area to be dewatered so that crews can pour concrete, excavate, repair, weld, etc.
What is an afflux?
: a flowing especially of a bodily fluid to or toward a bodily part an afflux of blood to the head.
Who invented cofferdam?
King Cyrus of Persia
The first cofferdams were said to be used by King Cyrus of Persia in 539 B.C. to temporarily divert water from the Euphrates river, allowing the capture of Babylon. This capture of Babylon ended their rule, allowing the Medo-Persian empire to begin.
Are cofferdams permanent?
Double wall cofferdam: Double wall cofferdams are somewhat permanent in nature and are built to last for few years. When construction work can take many years, single wall cofferdams may not be suitable. Single wall cofferdams leaks and dewatering is required on a regular basis.
Are caissons still used?
Caissons are generally used as the means to complete new construction, and may act as a cofferdam of sorts while the construction is ongoing. Cofferdams however, are not part of the permanent structure, and are typically employed to perform repairs or maintenance on the structure.
What is the meaning of drollery?
1 : something that is droll especially : a comic picture or drawing. 2 : the act or an instance of jesting or burlesquing. 3 : whimsical humor.
What is backwater curve?
Abstract. The transition curves of a nearly uniform flow state or, in general, the free surface profiles in open channels are designated backwater curves. They provide, for steady flow, the most general surface profile under a given discharge for specified boundary conditions.
How does an arch dam work?
The arch dam is an impressive structure which is curved upstream and uses hydrostatic pressure to transfer the force of water to the foundation and abutments of the dam. The force of the water on the fill side pushes against the arch, and the resulting resistance to bending transfers the loads to the abutments.
How much does a cofferdam cost?
The total time to complete one cofferdam was 26.64 days at a cost of $26,387 per cofferdam. The crane was idle 9.4% of the time. The next restrictive resource was Crew B (25.6% idle).
How does a cofferdam work?
A cofferdam (also called a coffer) is an enclosure built within, or in pairs across, a body of water to allow the enclosed area to be pumped out. This pumping creates a dry work environment so that the work can be carried out safely.
What is cofferdam on ships?
creating a dry work environment.
What is a cofferdam system?
A cofferdam (also coffer dam) is a temporary enclosure in or around a body of water that is constructed to allow the 3-D’s of water control (dewatering, diversion, or damming) of an enclosed area. The primary purpose of a cofferdam is to create a dry environment for a project to proceed. They were first used in 1736.