aton structures Flashcards
There are currently over ? ATON structures in the USCG-wide?
22,000
What is a Major ATON structure?
Major ATON structures are complex in design and construction and usually require significant engineering effort, Ranges and large offshore lights would be typical examples of Major ATON structures
What is Minor Aton structures?
Minor ATON structures are relatively simple in design and construction, and are usually made of wood, concrete or steel piles. They can be either lighted or unlighted. Conducted by CG.
what is CG-43 and how does it refer to aton?
is the engineering support manager for the short range aids to navigation program. This office establishes engineering policy and procedures relevant to ATON structures, equipment, and systems; manages funding for ATON facility construction and maintenance; and oversees the execution of the AC&;I Waterways marine construction program.
What does Civil Engineering Units (CEUs).
CEUs perform engineering design of ATON structures and administer contracts for design and construction services. and oversee maintenance and repair activities. They are responsible for establishing climber training requirements and overseeing climber training. They purchase structure outfitting equipment and other supplies which become part of the final structure, including piles for WLIC construction activities.
Minor aton structures should have a focal plane height of ? above mean high water?
15- 17 feet
what are the three main aton structures built with?
wood, steel and concrete
For major aton structures and on a case by case basis what shall be used for protection?
Cathodic protection
what is fixity?
(where the pile is vertically stable and fixed in the soil) can be attained.
when is multiple piles required?
When the penetration required for fixity cannot be achieved, it may be necessary to use a multiple-pile structure. Multiple piles should also be used when there is a need to reduce vibration.
what are the three common types of piles?
Battered pile dolphin
cluster pile dolphin -
platform foundation-
What is the tethering method used for?
It is used to connect the piling when in heavy knockdown areas, so it won’t cause a hazard.
what are some other foundation types?
include posts, spindles, caissons, concrete footings, concrete slabs, steel stakes, and rip-rap.
If you are welding a tower what shall it be iaw?
American welding society guidelines
When steel towers are installed, never do what?
never place them into soil, they shall be properly designed for concrete foundations.
What are platforms designed to support? and what are the surface area requirements?
support for equipment and personnel that might be on the aid platform at one time. The platform shall have a surface area of no less than 16 square feet to allow for adequate working space for servicing personnel.
What is ASCE 7? and what factor must CG structure achieve?
This document give the reqirements for design loads on structures? Safety factore or four.
What is American Concrete institute? ACI 318
This document contains requirements for the proper design and construction of structural concrete buildings.
What are guardrails on aton structures and how many are there?
They are provided on each structure and consist of three, which is situation 1,2,3
What is situation 1?
Guardrails shall be provided along the edges of all MAJOR ATON structure platforms
What is situation 2?
Guardrails shall be provided along the edges of minor ATON structure platforms that are positioned over water, are designed or used primarily as a walking or working surface.
What are the characteristics for Situation 2?
Platform is fifteen feet or greater above MLW level.
Structure is situated over rocks or debris that may cause injury to personnel in a fall.
Structure is situated in less than four feet of water at MLW level.
what is situation ? and one characteristic?
Positioned over land, and designed for walking or working surface.
Platform is four feet or greater above lower level;
what are the Guardrail Design Requirements?
Guardrails shall consist of a top rail, intermediate rail, and posts (stanchions), and shall meet the following requirements:
Top rail shall have a vertical height of 42 inches nominal from upper surface of top rail to the platform +or- 3 inches. Along with the strength of 200 lbs of top pressure.
are fixed ladders provided on all aton structures? and are safety devices provided?
yes, ladder safety devices shall be provided on fixed ladders over 20 feet in unbroken length. If a ladder is not provided then a cage or well shall be used instead.
what are the fall arrest systems?
Fall restraint systems such as guardrails, ladder safety devices, and work positioning systems are typically the preferred fall protection methods
a dayboard shall be designed in a way that gives its maximum?
Utility
When heavy bird fouling, you should mount the dayboard vertically how many degrees?
5 on an angle to the channel line, but for a strait channel 30 degrees.
Every Aton structure that meets the MAJOR requirements shall be visited?
At least once every 5 yrs, by the CEU or the delegated CEU
what do you do if you pull up to an aton structure and it doesnt meet your climbing requirements?
- perform a Field unit maintenance inspection by pulling up to it.
- if unsat, document the information on a cg-6042.
- Casrep it and send report to District.
- Then fill out the SSMR( shore station main record) form cg-4094 stating this is beyond your repairs.