WHARFAGE STRUCTURES

Figure 1-20.Cap and fender pile for bulkhead. - 14070_23

Figure 1-24.Cross section of an advanced-base timber pier. - 14070_25

Engineering Aid 1 - Advanced Structural engineering guide book
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Figure 1-21.—Types of wharfage structures. WHARFAGE STRUCTURES Wharfage structures are designed to allow ships to lie alongside for loading and discharge. Figure 1-21 shows various plan views of wharfage structures. Any of these may be constructed of fill material, supported by bulkheads. However, a pier or marginal wharf usually consists of a timber, steel, or concrete superstructure, supported on a substructure of timber-, steel-, or concrete-pile bents. Working drawings for advanced-base piers are contained in Facilities Planning Guide, Volume 1, NAVFAC P-437. Figures 1-22, 1-23, and 1-24 are portions of the advanced-base drawing for a 40-foot timber pier. Each part of a pier lying between adjacent pile bents is called a bay, and the length of a single bay is equal to the on-center spacing of the bents. In the general plan shown in figure 1-22, you can see that the 40-foot pier consists of one 13-foot outboard bay, one 13-foot inboard bay, and as many 12-foot interior bays as needed to meet the length requirements for the pier. The cross section shown in figure 1-24 shows that each bent consists of six bearing piles. The bearing piles are braced transversely by diagonal braces. Additional transverse bracing for each bent is provided by a pair of batter piles. The batter angle is specified as 5 in 12. One pile of each pair is driven on either side of the bent, as shown in the general plan. The butts of the batter piles are joined to 12-inch by 12-inch by 14-foot longitudinal batter-pile caps, each of which is bolted to the undersides of two adjacent bearing-pile caps in the positions shown in the part plan. The batter-pile caps are placed 3 feet inboard of the center lines of the outside bearing piles in the bent. They are backed by 6- by 14-inch batter-pile cap blocks, each of which is bolted to a bearing-pile cap. Longitudinal bracing between bents consists of 14-foot lengths of 3 by 10 planks, bolted to the bearing piles. Figure 1-22.—General plan of an advanced-base 40-foot timber pier. 1-12

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