UFC 4-213-10
15 August 2002
structures. There are other advantages and disadvantages which are directly
associated with the operation of the drydock itself. A tabulation of these for each shape
of head end is shown in Table 3-2, and is to be used as follows:
3-4.1.1
Square. Use the square end for carrier docks, for multiple docking, or for
docks that are likely to have future extensions.
3-4.1.2
Semicircle. Use the semicircular end for medium sized docks, that
cannot readily be lengthened at the head end.
Table 3-2 Design Considerations for Various Head End Shapes
Design Considerations
Trapezoid
Semicircle
Square
Economy of formwork
Best
Fair
Poor
Economy of concrete
Good
Best
Poor
Simplicity of trackwork
Good
Best
Poor
Simplicity of installation of service
Good
Poor
Best
facilities
Fit into yard
Good
Good
Poor
Adaptability for future extensions
Fair
Poor
Best
Providing access to dock floor:
For Carriers
Poor
Fair
Best
For Other Ships
Good
Good
Good
Suitability for multiple docking
Poor
Fair
Best
3-4.1.3
Trapezoid. Use the trapezoidal shape for small docks that are not likely
to be lengthened at the head end.
3-4.2
Entrance End. At the entrance end of a dock, the walls may be vertical or
sloped outward. Refer to Chapter 9 for caisson dimensioning and details of the seats.
3-4.2.1
Clearances. Ship clearances are not as large at the entrance as in the
body of the dock where working space is necessary. For docks having vertical walls,
allow 1.52 m (5 ft) minimum clearance from the ship hull on each side.
3-5
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