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APPENDIX 3D
MODEL SPECIFICATION – HYDRAULICALLY-DRIVEN PUSH PIER SYSTEMS
Chapter 3
Hydraulically-Driven Push Piers
10
TERMINATION CRITERIA
10.1 The final drive force and any required pier length and embedment depth criteria as specified
in the Pre-Construction Submittals shall be satisfied prior to terminating the pier installation.
Push pier installation will be halted if excessive lift of the structure occurs prior to reaching
the specified final drive force or pier length/depth criteria and the Owner will be notified of this
occurrence prior to continuation of the work. The Owner shall be notified in the event any push
pier fails to meet the production quality control termination criteria as specified on the Plans.
In the event that the pier does not meet the production quality control termination criteria, the
following remedies may be appropriate if approved by the Owner:
10.1.1 If the installation fails to meet the minimum final drive force criterion at the specified
embedment length:
10.1.1.1 Continue the installation to greater depths until the minimum final drive force
criterion is met, provided that, if a maximum length constraint is applicable,
continued installation does not exceed said maximum length constraint
10.1.2 If the maximum drive force rating of the push pier system is achieved prior to satisfaction
of a minimum embedment length criterion:
10.1.2.1 Terminate the installation at the depth obtained
10.1.2.2 Pre-drill to a depth that allows termination at or below the minimum embedment
length
10.1.3 If the installation reaches a specified maximum embedment length without achieving
the minimum final termination force criterion:
10.1.3.1 De-rate the load capacity of the push pier based on the final drive force
recorded at termination depth and install additional piers as necessary.
10.1.4 If a push pier fails a production quality control criterion as described in this Section
or for any reason other than described in this Section, any proposed remedy must be
approved by the Owner prior to initiating its implementation at the project site.
11
INSTALLATION RECORD SUBMITTALS
11.1 The Installing Contractor shall provide the Owner copies of individual push pier installation
records within 24 hours after each installation is completed. Formal copies shall be submitted
within 30 day from the completion of the push pier installation. These installation records shall
include, but are not limited to, the following information:
11.1.1 Date and time of installation
11.1.2 Location of push pier and pier identification number
11.1.3 Installed push pier model and configuration
11.1.4 Total length and tip depth of installed pier
11.1.5 Actual inclination of the pier
11.1.6 Hydraulic pressure reading at the end of each tube section installed