January/February 2021 - 20

The site and scheme constraints
combined with the high purchase and
development costs of this site meant that
the client, architect and engineer had to
push all elements of design significantly
beyond normal levels to deliver value
from the completed building.

Conclusion
For the 21 Moorfields development in
central London, the below-ground
works included very little opportunity
for correction while constructing the
most heavily loaded piles in use in the
U.K. Among the project team solutions
Reinforcement cage end (left), once in lifting cradle (right), could be safely pivoted upright
was a pile load test whose data has
already improved the understanding of
collaboratively with a best-for-project mindset. Supply chain
the performance of such large and heavily loaded piles.
partners were also integrated within the delivery team to
The fibre optics from the load test are now being used to
bring everyone's expertise to bear on providing a product at
monitor building movement and settlement during the
much higher quality and quality control standards. That held
construction phase. This data will provide new insights into
true despite innovative approaches being incorporated on site
the real-world performance of piles as the above-ground
that included ways of moving equipment and of constructing
structure is erected and building loads are applied. Such
the large diameter cored piles.
groundbreaking work has never been undertaken before in
Despite the challenges of pursuing an unconventional
the U.K. and has the potential to significantly influence the
piling project, the meticulous planning and execution led to
industry's understanding of pile behaviour and design.
the successful delivery of the works without any significant
The project constraints caused by the tight footprint for
defects, within budget and nearly two months ahead of
foundation construction led to a natural tension between the
programme.
desire of the design team to push all criteria toward their
Note: The CemOptics thermal integrity testing technique
limits and the construction team to mitigate risk to a
described has U.S. patent number 10,472,793; it was developed in
manageable level. Regular principals' meetings between the
collaboration with Ove Arup & Partners London and the University of
senior management of all the stakeholders ensured that
Cambridge Enterprise, and granted on November 12, 2019.
points of tension were escalated when necessary and resolved

Paul M. Wiltcher is the operations director
for Cementation Skanska. As a professional
civil engineer, he has over 25 years of experience
in the construction of major foundations
projects across the United Kingdom and
mainland Europe.
Jonathan D. Morris, Ph.D., is engineering
director of Cementation Skanska. A fellow of
the U.K. Institution of Civil Engineers, he has
worked across contracting, consultancy and
academia in a variety of roles and has over 25
ye a r s o f e x p e r i e n ce w i t h i n c i v i l a n d
geotechnical engineering.

Bailing tool devised

20 * DEEP FOUNDATIONS * JAN/FEB 2021



January/February 2021

Table of Contents for the Digital Edition of January/February 2021

Contents
January/February 2021 - Intro
January/February 2021 - 1
January/February 2021 - 2
January/February 2021 - Contents
January/February 2021 - 4
January/February 2021 - 5
January/February 2021 - 6
January/February 2021 - 7
January/February 2021 - 8
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