8-40 are portions of the advanced-base drawing for a40-foot timber pier. Chapter 10 provides furtherinformation on the advanced base functionalcomponents (ABFC).Each part of a pier lying between adjacent pile bentsis called a BAY, and the length of a single bay is equalto the on-center spacing of the bents. In the general planshown in figure 8-39, you can see that the 40-foot pierconsists of one 13-foot outboard bay, one 13-footinboard bay, and as many 12-foot interior bays asneeded to meet the length requirements for the pier.The cross section shown in figure 8-40 shows thateach bent consists of six bearing piles. The bearing pilesare braced transversely by diagonal braces. Additionaltransverse bracing for each bent is provided by a pair ofbatter piles. The batter angle is specified as 5 in 12. Onepile of each pair is driven on either side of the bent, asshown in the general plan. The butts of the batter pilesare joined to 12-inch by 12-inch by 14-foot longitudinalbatter-pile caps, each of which is bolted to theundersides of two adjacent bearing-pile caps in thepositions shown in the part plan. The batter-pile capsare placed 3 feet inboard of the center lines of the outsidebearing piles in the bent. They are backed by 6- by14-inch batter-pile cap blocks, each of which is boltedto a bearing-pile cap. Longitudinal bracing betweenbents consists of 14-foot lengths of 3- by 10-inch planks,bolted to the bearing piles.The superstructure (fig. 8-40) consists of a singlelayer of 4 by 12 planks laid on 19 inside stringersmeasuring 6 inches by 14 inches by 14 feet. The insideFigure 8-40.—Cross section of an advanced-base timber pier.8-28