Toro 4045 - Bore Path Planning Details; Defining Bore Entry Point; Identifying Beginning-of-Bore-at-Depth Point; Determining Required Bore Depth

PlanningtheBorePath
Beforesettingupthejobsite,youneedtoplantheborepath,
includingthefollowing:
Figure51
1.Boreentry
4.Obstacle
2.Beginning-of-bore-at-depthpoint5.End-of-bore-at-depthpointandboreexit
3.Boredepth
•Boreentry
Thisiswhereyousetupthemachineandthedrillbit
enterstheground.Dependingonconditions,thiswill
typicallybesetback9to15m(30to50ft)fromthe
beginning-of-the-bore-at-depthpoint.
•Beginning-of-bore-at-depthpoint
Thisisthepointwhereyouwanttheutilitylineorpipeto
endafterinstallationiscomplete.Itistypicallythepointat
whichtheborelevelsoutandbeginstoborehorizontally.
Thismaybethesameastheentrypoint,oryoumaydiga
separatedepth-gaugeholeatthispoint(Figure51).
•Boredepth
Thisthedepthatwhichyouwanttoinstalltheutility
lineorpipe.Thismachineisdesignedprimarilyfor
installationsbetween1and3m(3.5to10ft).
•Obstaclesinthepath
Itisimportanttoknowwheretheknownobstaclesare
thatyouwillneedtosteeraroundorunderbeforestarting
sothatyoucanplanwheretobeginsteeringpriorto
reachingtheobstacle.
•End-of-bore-at-depthpoint
Thisisthepointwhereyouwanttheutilitylineorpipe
tobeginafterinstallationiscomplete.Often,thiswill
alsobetheboreexit.
•Boreexit
Thisisthelocationwherethedrillheadwillexitthe
groundandthepointatwhichyouwillpulltheutilitylines
orpipeintothebore.Ifthispointwillbeatthesurface
insteadofatinstallationdepth,youwillneedtodetermine
thedistancefromtheend-of-bore-at-depthlocation
neededforsteeringthedrilltothesurface,typically9to15
m(30to50ft)fromtheend-of-the-bore-at-depthpoint.
DeterminingtheBore-entryPoint
Oneofthemorechallengingaspectsofplanningthebore
pathistodeterminetheentrypointofthebore.Youneedto
takethefollowingtraitsintoaccountwhendeterminingthe
locationoftheentrypoint:
•Boredepth
Thisisthedepthatwhichyouwanttoinstalltheutility
lineorpipe.Thismachineisdesignedprimarilyfor
installationsbetween1and3m(3.5to10ft).
•Pipeandmaterialexibility
The3m(10ft)pipesusedonthismachinecanexto
an8%pitchoverthelengthofthepipe;thisequatesto
abendofnomorethan20cm(8inches)offastraight
path(Figure52).
Important:Ifyousteerthepipetobendsharper
than20cm(8inches)perpipe,youmaydamagethe
pipesandtheirconnections.Youmustalsomake
steeringchangesgraduallyovertheentirelengthof
eachpipe.Ifyousteerthewhole20cm(8inches)
inonly25to50cm(1to2ft)oftravel,youwill
permanentlydamagethepipes.
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