Civil Engineering Reference
In-Depth Information
FIGURE 13.3
Common types of cast-in-place concrete piles. (
a
) Uncased pile; (
b
) Franki uncased-pedestal
pile; (
c
) Franki cased-pedestal pile; (
d
) welded or seamless pipe pile; (
e
) cased pile using a thin sheet shell;
(
f
) monotube pile; (
g
) uniform tapered pile; (
h
) step-tapered pile. (
Reproduced from Bowles 1982 with
permission of McGraw-Hill, Inc.
)
3.
Steel cage and concrete:
Once the bottom of the pier hole has been cleaned, a steel
reinforcement cage is lowered into the pier hole. Small concrete blocks can be used to posi-
tion the steel cage within the hole. Care should be used when inserting the steel cage so that
soil is not knocked off the sides of the hole. Once the steel cage is in place, the hole is filled
with concrete. Figure 13.10 shows the completion of the pier with the steel reinforcement
extending out the top of the pier.
4.
Grade beam construction:
The next step is to construct the grade beams that span
between the piers. Figure 13.11 shows the excavation of a grade beam between two piers.
Figure 13.12 shows the installation of steel for the grade beam. Similar to the piers, small
concrete blocks are used to position the steel reinforcement within the grade beam. A
visqueen moisture barrier is visible on the left side of Fig. 13.12.
