Page 202 - Urban Construction Project Management

Logistics 157
Exhibit 6-36
Slurry wall with
anchors.

Soil mixing—This procedure mixes grout with the soil (by rotating paddles) to create
small long cylinders (that reach the bottom of the excavation). The continuous linking
of these cylinders would provide a wall around the site.

1
Soil nailing—Reinforcing steel bars of approximately / in. to 2 in. are placed hori-
2
zontally into the soil with plates on the outside of the soil. Then grout is injected
along the length of the reinforcing bars. This nailing creates a solid block of soil that
can sustain the earth’s pressures. This method can increase the shear strength of the
soil.

EXCAVATION

Excavation is a method for removing earth and rock from a site in order to get to a cer-
tain elevation, usually below street level. The reasons for getting to a lower elevation
could be for:
1. Basement storage area
2. Mechanical equipment room
3. Electrical rooms, especially for entering electric service that would emanate from a
transformer that is installed below the street level
4. Utilities coming into the site from those that are buried in the street
5. Spread footings for the foundation
6. Parking garage
7. Special functions for the building (meeting rooms, gym, etc.)