8-40 are portions of the advanced-base drawing for a 40-foot timber pier. Chapter 10 provides further information on the advanced base functional components (ABFC).

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 8-39, 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 8-40 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-inch planks, bolted to the bearing piles.

The superstructure (fig. 8-40) consists of a single layer of 4 by 12 planks laid on 19 inside stringers measuring 6 inches by 14 inches by 14 feet. The inside

Figure 8-40. - Cross section of an advanced-base timber pier.