September/October 2021 - 111

Predio 2
Pipe Racks: Shea Brothers Mexico was
also awarded a contract to install CFA
piles as deep foundations for pipe racks
in the Predio 2 jobsite. The installation
of CFA piles, rather than conventional
drilled shafts, reduced production time
and improved load capacity at the
refinery jobsite.
Installation of 232 piles was initially
requested by the client, but the quantity
was increased to 630 because pile
installation was ahead of schedule. A
total of 437 continuous flight auger piles
with a diameter of 32 in (81 cm) and 193
CFA piles with a diameter of 39.4 in
(100 cm) were installed to depths of 95 ft
(29 m) to 105 ft (32 m) at the Predio 2
Project. Production commenced on
November 9, 2020, and concluded in
early March 2021.
Automated pile log for a DDP RI at Predio 1
SBM drilling of CFA pile behind waiting reinforcement cages
Soil Conditions: The instability of soft
soils and dangerous ground conditions
made it difficult to drill in some rack
areas. Worksites within the Predio 2
project became available for pile
installation at irregular intervals and
necessitated ongoing relocation of the
drill rigs. The installation sites were a
minimum of 800 ft (244 m) apart and
often as far afield as 0.5 mi (804 m).
Deep Foundation Applications
CFA Construction: SBM CFA piles provided
an economical, field-proven deep
foundation solution throughout both
projects. Shea Brothers Mexico installed
as many as sixteen 80 cm (31.5 in) and
1 m (39.4 in) CFA piles to depths of 92 ft
(28 m) in a single day. This expedited
production level assured on-time
project completion. Conventional drilled
shafts, other than CFA, were installed by
other contractors at the site at the rate of
1 to 1.5 per day.
The Fundex F3500 drill rigs installing
the piles exert up to 50 meter-tons
of torque, 45 tons of crowd force and 120
tons of extraction force. Prior to the start
of drilling, each pile's number was
entered into the SBM onboard AME.
The CFA tooling was connected by
hose to a high-powered concrete pump.
A special self-consolidating, coarse aggregate
concrete mix was pumped under
pressure through the hollow stem of the
CFA tool to the base of each borehole.
Drilling began with the CFA tool rotating
clockwise as crowd force was applied to
the auger. The tooling advanced with
high-torque rotation and crowd so
installation proceeded in a constant
motion and without over rotation.
DEEP FOUNDATIONS * SEPT/OCT 2021 * 111

September/October 2021

Table of Contents for the Digital Edition of September/October 2021

Table of Contents
September/October 2021 - Intro
September/October 2021 - 1
September/October 2021 - 2
September/October 2021 - Table of Contents
September/October 2021 - 4
September/October 2021 - 5
September/October 2021 - 6
September/October 2021 - 7
September/October 2021 - 8
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