Page 505 - Trenchless Technology Piping Installation and Inspection

Index 455

tree roots, 285t utilities (Cont.):
trench walls, 122t safety and, 381
trench width, 71t, 121f separation from existing, 216
trenchless technology. See also strikes of, 391
planning for trenchless SUE and, 367–368, 367t
installation; specific technology uniform color codes for, 385, 386t
benefits of, 4 utility strike, 391
cost estimation/bidding in, 43, 43t utility survey, 241–242
existing pipe renewal/replacement utility tunneling (UT)
and, 51, 52t, 53, 54t, 55t–56t applications, 33t
loads, 4, 5f method of, 13–15, 15f
main divisions of, 5, 7f, 8–9 minimum depth guidelines, 31, 34t
method characteristics/applications, pipe/soil type and, 35t
31, 32t, 33t, 34t, 35t UV. See ultra violet light cured resins
method selection guidelines, 35t
vs. open-cut construction operations, vacuum patches, loose/peeling, 304t
6t VCP. See vitrified clay pipe
planning/safety considerations, vinyl ester resins, 283
39–42, 42f viscoelastic material properties,
risks of, 40–41 154–155, 154f
terminology of, 121f, 122t vitrified clay pipe (VCP)
tube wet-out, 288–289, 289f advantages/limitations of, 152–153,
tuberculation 152t
CIPP and, 285t joint standards regarding, 150
in water pipes, 93, 94f joint types, 151–152, 151f, 152f
tunnel boring machine (TBM) manufacturing, 150
MT and, 312, 315f standards, 150, 151t
open shield excavator, 12, 13f uses of, 149–150
open shield wheel, 11, 13f von Pechman, Hans, 161
turnkey (design-build) contracts, 200
wall buckling, 137–138, 138f
U.K. method, 102 wall crushing, 137, 137f
ultra violet (UV) light cured resins, waste disposal, 106
283, 288 water mains, pipe bursting, 260, 260f
undercreep holiday, 103t water strike, 391
Unified Soil Classification System watertight joints
(USCS), 124, 125t HAB and, 334
uniform color codes, utility, 385, 386t HDD and, 347
unit price (footage) contracts, 201 MT and, 320
unplasticized PVC (PVC-U), 156 pipe bursting and, 355
unsaturated polyester resins, 283 pipe ramming and, 339
upsizing, 230 Watkins, R. K., 126
USCS. See Unified Soil Classification wet casting, 142
System white spots, 304t
UT. See utility tunneling Whitehouse, Cornelius, 1–2
utilities wooden pipes, 1
HDD and, 342 worker entry pipe jacking, 9, 11, 11f
locating existing, 366–367 working pits/shafts safety, 384–385
mapping of, 389–390 work-site restoration, 360–361
nearby, 255–256 wrinkles, 300t–301t