figure 10-15, a cross section for a 40-foot pier.
The drawings (examples are shown in figs. 10-13,
10-14, and 10-15) include a bill of materials, showing
the dimensions and location of all structural members,
driftpins, bolts, and hardware. Figures 10-13
and 10-14 are parts of NAVFAC Drawing No.
6028173; figure 10-15 is a part off NAVFAC Drawing
6028174.
The size of the pier is designated by its width. The
width is equal to the length of a bearing-pile cap.
Each part of a pier lying between adjacent pile
bents is called a bay, and the length of a bay is equal
to the OC spacing of the bents. The general plan (fig.
10- 13) shows that the advanced base 40-foot timber
pier consists of one 13-foot outboard bay, one 13-foot
inboard bay, and as many 12-foot interior bays as
needed to meet requirements.
The cross section (fig. 10- 15) 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 these is bolted
to the undersides of two adjacent bearing-pile caps
with bolts in the positions shown in the part plan (fig.
10- 14). 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.
C R O S S S E C T I O N
Figure 10-15.-Cross section of an advanced base timber pier.
10-8
