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APPENDIX 3D
MODEL SPECIFICATION – HYDRAULICALLY-DRIVEN PUSH PIER SYSTEMS
Chapter 3
Hydraulically-Driven Push Piers
5
ACCEPTABLE PRODUCTS
5.1 Push Pier System Models PP237, PP288, PP350 and PP400 manufactured in accordance with
the requirements of Sections 5 and 6 of this specification.
5.2 Model PP237 Push Pier System
5.2.1 Starter and Pier Tube Sections: The central steel shaft of the starter and pier tube sections
are 2.375-inch outer diameter by 0.154-inch nominal wall thickness hollow structural
section in conformance with ASTM A500 Grade B or C with a minimum yield strength
of 60 ksi and a minimum tensile strength of 70 ksi. The starter tube includes a 1.00-
inch long factory-welded friction reduction collar manufactured from 2.875-inch outer
diameter by 0.203-inch nominal wall thickness hollow structural section conforming to
ASTM A53 Grade B, Type E & S with a minimum yield strength of 35 ksi and a minimum
tensile strength of 60 ksi. The starter tube and pier tube shaft finishes are either plain
steel or hot-dip galvanized in accordance with ASTM A123.
5.2.2 Shaft Coupling Material: The shaft coupling material is factory crimped or plug-welded
to one end of the tube section and consists of 2.00-inch outer diameter by 0.187-inch
nominal wall thickness hollow structural section in conformance with ASTM A500 Grade
B with a minimum yield strength of 42 ksi and a minimum tensile strength of 58 ksi. The
pier tube shaft coupling finish is plain steel.
5.2.3 External Sleeve: The central steel shaft of the external sleeve is 2.875-inch outer diameter
by 0.203-inch wall thickness hollow structural section in conformance with ASTM A500
Grade B or C with a minimum yield strength of 60 ksi and a minimum tensile strength
of 70 ksi. A 0.75-inch long collar, welded to one end is manufactured with 3.375-inch
by 0.188-inch wall thickness hollow structural section conforming to ASTM A53 Grade
B, Type E & S with a minimum yield strength of 35 ksi and a minimum tensile strength
of 60 ksi. The external sleeve shaft finish is either plain steel or hot-dip galvanized in
accordance with ASTM A123.
5.2.4 Bracket: Retrofit bracket PP238B is suitable for use with the PP237 push pier system.
Bracket finishes are either plain steel or hot-dip galvanized in accordance with ASTM
A123. Bracket hardware finishes are zinc coated in accordance with ASTM B633.
5.3 Model PP288 Push Pier System
5.3.1 Starter and Pier Tube Sections: The central steel shaft of the starter and pier tube sections
are 2.875-inch outer diameter by 0.165-inch nominal wall thickness hollow structural
section in conformance with ASTM A500 Grade C with a minimum yield strength of 50
ksi and a minimum tensile strength of 55 ksi. The starter tube includes a 1.00-inch long
factory-welded friction reduction collar manufactured from 3.375-inch outer diameter
by 0.188-inch nominal wall thickness hollow structural section conforming to ASTM
A53 Grade B, Type E & S with a minimum yield strength of 35 ksi and a minimum tensile
strength of 60 ksi. The starter tube and pier tube shaft finishes are triple coated in-line
galvanized.
5.3.2 Shaft Coupling Material: The shaft coupling material is factory crimped or plug-welded
to one end of the tube section and consists of 2.50-inch outer diameter by 0.180-inch
nominal wall thickness hollow structural section in conformance with ASTM A53 Grade
