Notes: ‘Design of the renewal pipe shall be based on prism load on the
renewal pipe, using the outside diameter of the renewal pipe in the
calculation.
“Impact factors to be included when depth of cover is less than 3 feet
per values recommended by AASHTO.
*Impact factors to be included when depth of cover is less than 10
feet per criteria established by AREA “Manual of Recommended
Practice”.
D. The minimum thickness of the pneumatically assisted slipline pipe to be
installed shall be as determined for the design conditions imposed.
Calculations for the determination of the required liner pipe stiffness or
DR shall be the largest pipe stiffness or smallest DR for each slipline pipe
installation reach (insertion pit to receiving pit), as determined by
calculations provided for the following parameters: (1) Maximum
Deflection; (2) minimum pipe stiffness or maximum DR; (3) ring bending
strain; (4) hydrostatic collapse resistance using short-term modulus of
elasticity, and (5) constrained buckling resistance using long-term
modulus of elasticity.
E. The Contractor shall submit test results with respect to the physical
characteristics of the pneumatically assisted slipline pipe. These tests shall
be at no additional cost to the Owner. These tests shall include the
following:
F. Tests for Tensile Strength of HDPE pipe material shall be in accordance
with ASTM D638. The minimum tensile strength shall be 3,100 psi.
1. Tests for the Determination of Environmental Stress Crack
Resistance (ESCR) shall be in accordance with ASTM F1248, with
an ESCR test equal to 2,000 hours.
PART 3 - EXECUTION
3.1 CONSTRUCTION PROCEDURE
A. Pneumatically assisted sliplining shall be performed with minimum
excavation and demolition of existing structures, and the Contractor shall re-
establish connections and minimize the disruptions to adjacent properties,
traffic, and wetlands. Excavation for point repairs or emergencies shall be
permitted, but only as approved by the Owner and permitting agencies.
02769-9
