January/February 2022 - 82

Tieback installation adjacent to existing building
to be transferred to the micropile towers
before excavation began. The design
column loads, which ranged from 280 to
720 kips (1,245 to 3,203 kN), were
incrementally transferred from the
existing foundations to the new
micropiles using hydraulic jacks until
separation between the column and
existing foundation was observed.
With the building load now supported
by the new shoring system, the
existing foundations could be demolished,
and the excavation could proceed.
As the excavation progressed,
steel angles were added between the
micropile supports, creating a trussed
tower. Once the new subgrade was
reached, pile caps were poured around
the micropiles. Headed shear studs
were welded to the micropiles to
transfer the future column load from
the new pile caps to the micropiles.
Test setup for shear stud strength, connection to micropile
82 * DEEP FOUNDATIONS * JAN/FEB 2022

January/February 2022

Table of Contents for the Digital Edition of January/February 2022

Table of Contents
January/February 2022 - Intro
January/February 2022 - 1
January/February 2022 - 2
January/February 2022 - Table of Contents
January/February 2022 - 4
January/February 2022 - 5
January/February 2022 - 6
January/February 2022 - 7
January/February 2022 - 8
January/February 2022 - 9
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