Underground Construction - December 2019 - 20
Directional Drilling
Sliplining with an HDD Twist
Jeff Griffin | Senior Editor
Teamwork among organizations with multiple skills and specialties is credited with rehabilitating a vital 1.5-mile-long segment of
the sanitary sewer system serving two Denver, Colo., suburbs.
The Colsman Tunnel is an essential part of the Big Dry Creek
Interceptor sanitary sewer system serving the communities of
Greenwood Village and Centennial. The system is owned and
operated by the Southgate Sanitation District (SGSD).
Constructed from 1976 through 1978, the mushroom-shaped
dimensions were 5 feet, 9 inches high with widths ranging from
4 feet, 3 inches to 10 feet. The interior was lined with wire mesh,
shotcrete and coated with coal tar epoxy.
20
DECEMBER 2019 | UConOnline.com
Over the years, the tunnel had become badly deteriorated with
serious structural defects and was experiencing groundwater infiltration. In 2015 a multi-sensor robotic inspection was performed
by SGSD. HDR Engineering provided a tunnel condition report,
which identified structural deficiencies, corrosion, surface spalling
infiltration and lining defects. The report recommended action to
restore and renew the tunnel.
Based on the age of the tunnel, its continuous exposure to
highly corrosive wastewater environment, the inability to safely
perform internal spot repairs and a lack of redundancy in the
event of failure, the district became increasingly concerned with
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Underground Construction - December 2019
Table of Contents for the Digital Edition of Underground Construction - December 2019
Contents
Underground Construction - December 2019 - FC
Underground Construction - December 2019 - IFC
Underground Construction - December 2019 - Contents
Underground Construction - December 2019 - 4
Underground Construction - December 2019 - 5
Underground Construction - December 2019 - 6
Underground Construction - December 2019 - 7
Underground Construction - December 2019 - 8
Underground Construction - December 2019 - 9
Underground Construction - December 2019 - 10
Underground Construction - December 2019 - 11
Underground Construction - December 2019 - 12
Underground Construction - December 2019 - 13
Underground Construction - December 2019 - 14
Underground Construction - December 2019 - 15
Underground Construction - December 2019 - 16
Underground Construction - December 2019 - 17
Underground Construction - December 2019 - 18
Underground Construction - December 2019 - 19
Underground Construction - December 2019 - 20
Underground Construction - December 2019 - 21
Underground Construction - December 2019 - 22
Underground Construction - December 2019 - 23
Underground Construction - December 2019 - 24
Underground Construction - December 2019 - 25
Underground Construction - December 2019 - 26
Underground Construction - December 2019 - 27
Underground Construction - December 2019 - 28
Underground Construction - December 2019 - 29
Underground Construction - December 2019 - 30
Underground Construction - December 2019 - 31
Underground Construction - December 2019 - 32
Underground Construction - December 2019 - 33
Underground Construction - December 2019 - 34
Underground Construction - December 2019 - 35
Underground Construction - December 2019 - 36
Underground Construction - December 2019 - 37
Underground Construction - December 2019 - 38
Underground Construction - December 2019 - 39
Underground Construction - December 2019 - 40
Underground Construction - December 2019 - 41
Underground Construction - December 2019 - 42
Underground Construction - December 2019 - 43
Underground Construction - December 2019 - 44
Underground Construction - December 2019 - 45
Underground Construction - December 2019 - 46
Underground Construction - December 2019 - 47
Underground Construction - December 2019 - 48
Underground Construction - December 2019 - 49
Underground Construction - December 2019 - 50
Underground Construction - December 2019 - 51
Underground Construction - December 2019 - 52
Underground Construction - December 2019 - 53
Underground Construction - December 2019 - 54
Underground Construction - December 2019 - 55
Underground Construction - December 2019 - 56
Underground Construction - December 2019 - 57
Underground Construction - December 2019 - 58
Underground Construction - December 2019 - IBC
Underground Construction - December 2019 - BC
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