GB2386139A - Method of forming a trenchless flowline - Google Patents
Method of forming a trenchless flowline Download PDFInfo
- Publication number
- GB2386139A GB2386139A GB0205389A GB0205389A GB2386139A GB 2386139 A GB2386139 A GB 2386139A GB 0205389 A GB0205389 A GB 0205389A GB 0205389 A GB0205389 A GB 0205389A GB 2386139 A GB2386139 A GB 2386139A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sight
- bore
- hole
- boring
- tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000005553 drilling Methods 0.000 claims abstract description 11
- 239000002002 slurry Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 8
- 230000005641 tunneling Effects 0.000 description 9
- 238000009434 installation Methods 0.000 description 8
- 239000002689 soil Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000000981 bystander Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000000135 prohibitive effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 206010002368 Anger Diseases 0.000 description 1
- 241001222723 Sterna Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- -1 boring Ruids Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 238000007592 spray painting technique Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
- E21B7/205—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes without earth removal
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
A method of drilling a flowline underground which comprises the steps of excavating a first sight relief hole 18 and a second sight relief hole 20 along a linear path, positioning a directional drilling machine at the surface, boring a pilot hole from the surface to the first sight relief hole, determining the elevation of the boring tool, adjusting the elevation if desired, and boring a pilot hole from the first sight relief hole to the second sight relief hole, determining the elevation of the boring tool, adjusting the elevation if desired. The method may also comprise the steps of reaming the pilot hole to define a bore and pulling a pipe into the bore, displacing a portion of slurry formed into the excavated holes.
Description
<Desc/Clms Page number 1>
METHOD OF FORMING A TRENCHLESS FLOWLINE
BACKGROUND OF TEE INVENTION The present invention relates generally to a method for forming a Bowline and, more particularly, to a method of directional boring a trencldess flowline bore using sight re1iefholes to set the proper grade and line and to prevent the pressure Rom building up about the pipe as it is placed within the Bowline bore.
Proper installation ofundefground utilities sttch as stonn sewer and sanitaty sewer iines require bonng a Hnear Bodine. It is desitaMe, and oentimes mandatoiy to insta ! ! the flowline at a constant grade & om one end of the flowline to the other. Ideally, once the flowline is completed a lamp is shown at one end of the line. If the lamp is completely visible at the opposing end of the flown then a substantially constant grade has been maintained along the length of the flowEne, and the Bowline will effectively drain in the proper direction.
Ih & epasanumberofmemodshavebeenusedtoinstallpipeswithBowHncs. The pnmamethodofconsinonisopen digging orcenchmg. To digaflowline, alatBetrench isdug along the entire length of the line. Typically, a trench box is placed within the trench to protect
<Desc/Clms Page number 2>
workers located within the trench. The box is moved incrementally along the path of the Bowline installation as the flowline is being built Gravel and earth are placed around the pipe to maintain the location of the pi the trench is subsequently back filled after the trench box is moved down the path of the Sowline installation.
The open digging process suffers from a number of significant drawbacks. For instance, open trenches are hazardous for workers open digging the trench. It is possible for equipment and other objects to fall into the trench and strike workers therein. Also, it is common for large sections or clods of earth to dislodge and tumble into the open portions of the trench not protected by the trench box. Since son typically weighs more than 100 pounds per cubic foot, even asn ! a secdon may cause senousinur or deapariculady at he deptbs at which many miury are instaDed. Lilcewise, open trenches present an obvious danger to children and other bystanders.
The sheer size of the trench required for open digging also causes a number of problems. A great deal of time and effort is devoted to both digging andrefil1ine each trench. A1so many digging locations, such as urban cnviromnents, simply do not have convenient locations at which the trenches may be dug. Additionally, the excess trench materials must be hauled away at the expense of the contractor or owner of the utility being installed.
Many other problents are associated with the open digging process. For instance, restoration of the site to its conditionpnorto instaUation of the flowline is difficult. It is particularly difSculttorestorethecontmmtyofthepavementando < gMMdcondiConsattheinstall Also, the costs are substantial to fill around & e pipe with gtatHMarbackSU to keep the pipe inplacc.
CMherproNsms include the difficulties associated with digging underinelement weather conditions, the negative eNVHomnental impact of the open digging process, expensive removal of water from the ground prior to digging, and the Mgh fuel costs of operating open digging equipment
<Desc/Clms Page number 3>
Additionally, the impact on businesses and the local economy, environment and quality ofHfe is great. Taking all of these negatives into consideMtion, other methods such as tunneling and auger boring are somethnes utilized for flowline installations. To install a flowline by tunneling large pits are dug at the entrance and exit points and the installing machine is located within the entrance pit. The machines ! nay be operated either within the courues of the machine or remotely at the surface. In the tunneling method, the pipe is jacked into place within the bore by hydraulic rams as the tunneling equipment is used to cut the soil At the end of the installation, the tunneling equipment is detached from the pipe and removed fiom the exit pit.
While the tunneling process overcomes some of the problems associated with open trenching, it too suffers from significant drawbacks. Since the tunneling equipment required to instal smaller diameter bores is complex and expensive, it is uncommon for tmmeting to be used for bores of less than three feet in diameter, and oftentimes cost prohibitive for bores having a diameter of less than two feet. Also, tunnelling equipment is bulky and heavy, and cranes are common1yneeded to lower the equipment into place. MoreovQ", a significant area must be set aside above ground for placement of the equipment used to guide thetunnelingmacbine and recycle fluids during the tunneJingprocess. AJso, in the tunne1ing tlie pipe must have sufficient strength P4e to withstand the forces of the hydraulic jacks. Steel and other pipe materials that have the strength to withstand these forces are susceptible to corrosion ifused in acidic soil conditions, or as sewage or stone water drains. Thus, it is sometimes necessary to place a carrier pipe within the pipe installed by the tunnelling method. This adds expense both during installation and maintenance ouf me Bowline.
As mentioned above, auger boring has also been used as an alternative to open digging. Similar to the tunneling process, entrance and exit pits are dug at the endpoints of the 199M
<Desc/Clms Page number 4>
desired line, and an auger machine is set into place within one of the pits. A cutting head is fastened to a length (or flight) of augers, and the augers are shoved through the pipe that is to be installed.
Additional auger Nights are added to the machine and pushed forward using ajacking process. as the bore is fonned, the material frn the bore hole is removed by the screw-like angers.
Themost significant drawbackto auger boring is the lack of guidance. Exheme care must be taken priorto setting up the auger boring machine to ensure that the machine is at the proper gradeand ! me. mtheaugerbomprocess. acamerpMrequired & rtworeasons. yirst. thepipc pme is located within the bore by ajac1dng process similar to tunneling, and must withstand the jac1åpg faces. Secondi/t the grade and line of the auger bore are oftentimes incorrect, and the canierptpe is installed within the outer pipe to meet the required grade. In addition to these problems, installations of significant lengths require expert operators and are difficult to complete in a timely and consistent manner.
To address the problems of the aforementloned methods, directional dnlling machines, Mtch as those sold under the filenames DITCHWITCH VERMBBR and CASE haye been developed to directionally drill flowlines. A drilling machine is placed on the surface at a distance Som the-desired starting location of the bore. Downhole tooling is attached to a drill stem and drilled through the ground along a pilot hole from the surface of the ground to the desire ! starting location, and then along the path of the desired flowline, Additional sections of drill rods are added to the drill stem as the pilot hole is made. Electronic tracking components arc disposed on the machine and downhole tool to guide the downhole tooling as the pilot hole is drilled. Once the pilot hole is complete, a hole opener such as a reaoung head is placed on the machine and the pilot hole is backreamed to create the desired bore while the pipe is being pulled into place.
<Desc/Clms Page number 5>
While the use of directional drilling machines eliminates many of the problems associated with open trenching, the machines also suffer some serious drawbacks. Namely, the electronic tracking components are not accurate enough to install the bores at the line and grade required for flowline bores. Thus, directional drilling machines are usually utilized for utilities that do not require very accurate line and gradue, such as phones cables and pressure systems. Prior attempts to drill bores that require spedSctmes and gjccs aM ien high. With current methods, when the Bowline is drilled at a significant depth and/or the grade is relatively slight, me electronic tractang components simply can not control the tooling with the required precision.
Also, in the process currently used ft dftocdoiw bor ! M the dixt slurry remab & g in the bore after the back reammg process is not always entirely pushed out of the ends ofbore as the pipe is pulled into the bore. Consequently, a great deal of pressure is developed between the outer surface of the pipe and the bore sidewalls. This pressure can cause the pipe to collapse pull apart or deflect nom the intended line and grade. If the bore-4= is increased with respect to the diameter ofthe pipc to minimize pressure build-up, the pipe can Boat or deBect with respect to the desired centerline of bore,, and the desired grade of the Bowline pipe will not be achieved. When floating or deflection occurs, the flowline bore is quite likely to fail the lamping test have high and low spots, and will not satisfy the requirements specified in. the codes for proper installation of flow nes as dictated by local laws.
BRIEF SUMMARY OF THE INVENTION The present invention is an improved method of installing : a Bowline below the surface utilizing directional boring. The method includes the steps of establishing first and second
<Desc/Clms Page number 6>
site relief holes along a linear path, positioning a directional drilling machine on the surface, boring
a first portion of a pilot hole nom the surface to the fimt sight relief hole, determining the elevation of the boring tool and adjusting the boring tool to the desired elevation, boring a second portion of the pilot hole to the second reliefhole, and detennining the elevation ofthe boring tool and adhtsting the tool to the desired elevation.
In =other aspect of the invention, a method for directionaUy boring a flowline is provided. The method includes the steps of establishing a number of sight relief holes along the desired path of the box, directiona11y drilling a pilot hole, feammg the material around pilot hole to define a bore wherein a portion of the bore is filled with a slimy of the reamed matenal, aad pulling a pipe into the bore uierein assion ofthe Fluny is displaced into the site reliefholes so that pressure does not develop around the pipe.
By providing the methods in accordance with the present invention, numerous advantages are achieved. of the present invention, and the and at depths at which machines have been unsuitable heretofore. The disturbance at the construction site is lessened since fewer and For instance, flowlines may be located with great accuracy, are needed, and significantly less surface area isneeded fbrthe equipment. Moreovcr, less fuel is consumed in the methods smaller excavations
overnD social costs are reduced. Of great import, the wondng condnioms are much safer for both workers and bystanders because of the reduction and near elimÏm\tion of open excavatioD. The sight relicfholes prevent pressure from building around the pipes to allow the nowlinc bore to be drilled at a diameter only slightly greater than the diameter of the pipe. This allows the pipe to be pulled m place accurately within the bore. Thus, the problems of pipe float or deflection can be avoided, and pipes may be placed at great depths and at very slight grades.
<Desc/Clms Page number 7>
BRIEF DESCRIPTION OF THE DRAWINGS
The preferred embodiment of the present invention is described in detail below with reference to the attached drawings, wherein : Fig. 1 is a schematic sectional view of a directional bore formed in accordance with the method of the present invention ;
Fig. 2 is an enlarged sectional view of me stem bore, placed in the ground during the first step of the method of the present invention;
Fig. 3 is an enlarged sectional view of the reamed out bore after the second step of the present invention ; and Fig. 4 is an enkmed sectonal viewofthe drainagepipebemgpuned into the reamed out bore in accordance with the final step of the present invention.
DBTAJLBD DESCR1PTION OF THE INVENTION With reference to Fig. 1, the site at which the directional bore is to be drilled is designated generally by the reference numeral 10. First, the ceatcrline of the undetground bore is established with respect to the surface 12. Specifically, the linear direction of the bole is directly mmked at the smfàce and the elevation (or depth) depth atwhioh the bore is to be drilled is mdiaated. at each of a number of points. In the preferred method, a transit or laser 13 is placed on the surface, 12 is sighted along line 15 in either direction along the centerline direction of the bore at selected points. The grade of the flowline bore is reflected by marking the depth of the centerline of the bore with reference to the level of the line 15. A pipe drop allowance is factored into determining & e centerlinemeasurementsdependinguponthesizeofthepipeandthematerialfromwhichthepipe
<Desc/Clms Page number 8>
is made-Other conventional techniques for deteonining the direction and depth of the center line of the flowline bore may be employed such as by maikiag grade reference points on stakes or spray painting the reference information directly onto the ground surface at each of the selected pomts.
Next, a first hole 14 is dug ftom the surface 12 at the desired initial point of the Bowline bore. A sççondhole 16 is dug & om the sm & cc above the desired tenninal point of the bore.
A number of sight relief holes are excavated between the jSist and second holes along the line indicated on the =face, preferably at the selected points at which the depth of Bowline bore is indicated at the surface.. Specifically, a first sight re1iefhole 18 is excavated at a distance DJ from the center of first hole 14, and each of the remaining sibt jeHef holes 20 are positioned at the distance D, D... D & om the preceding sigbt feKefholc. Preferably, the distances between each of sight relief hole are equal to one another, and the distanoe Dr between the final sight relief hole and the second hole 16 is less than the distance between each of the sigh relief holes. The actual distance between sight relief holes varies with each project depending on the desired grade of the flowline. Typically, for a less severe grade the sight relief holes are positioned closer to one another. For instance, atypical distance between sightreliefholes for-lowline havingagrade of 0. 5 % is betweenStytoah hundred & et. WhenthedesiredgradeissignifictIysteeper, hedistance between the sight relief holes may be increased while equidistant sight relief holes embody the prefened embodiment of the present invention, the holes m, ay be placed at irregular distances from one another. For instance. when the flowline is to be insta11ed under an obstruction such as a road or building, the sight relief holes may be placed on either side of the structure departing from the pattern of the holes not affected by the obstruction.
Each sight relief hole is established by drilling, digging or otherwise excavating vertically to a depth of about one foot below the desired centerlrne of the pjtpe, although greater or
<Desc/Clms Page number 9>
lesser depths may be desired in some cases. For instance, if the pipe is to be placed at a depth of twenty-five feet at a particular point. the sight relief hole at that point is excavated to about twentysix feet. The diameter of the sight relief holes is determined by the soi ! conditions of the ground at the site 10. If a pipe having a twelve inch diameter is to be placed within the directional bore, the sight reliefholes typically have a diameter ofbetween twelve to sixteen inches, although other sizes may be utilized. In the preferred method, once the sight relief holes have been formed, a soft material pipe is placed within the holes to hold the holes open while the flowline bore is drilled as descnbcd below. Alternatively, aham mateaal pipe may be placed in the sight relief holes due to soil conditions orother sight specific reasons. Typical softpipematenalsincludepolyvinyl chlonde (pic), highdensitypolyeuene (HDPE), low density polyefbyIene (LDPE) or car Typical hard pipe material would iacMe steel or concrete.
Prior to or after the sight relief holes have been excavated, a directional boiing machine 22 is setup on surface 12. The directional boring machine has electronic guide means for controlling the position of the bore stem under the surface of the ground. The machine is placed at a sufficient distance from the first hole 14 so that the downhole tooling on the bore stem (or downhole tooling) may be drilled to me desired depth at which the directional bore is to begin.
Imtiauy, a pilothole is dnUed aIongmeImeschemancyindicated byIine24. Whenthe borestem of the boring machine 22 reaches initial point 26 at hole 14, the position of & e bore sterna Prefembly, the depth and line of the bore stem is measured with respect to the laser beam 28 emanating nom transit 13. If the elecfronic control means of the directional boring machine 22 are not exactlycorrect and the bore stem is not in the proper position, adjusftents aremadetoreposion the stem at the proper depth and ce ! atcr line. Also, the grade of the downhole tooling is checked and adjusted to match the desired grade of the Bowline.
<Desc/Clms Page number 10>
I Next, the downhole tool affixed to the bore stem of the boring machine 22 travels along the path indicated by numeral 30 until reaching the nrst sight relicfhole 18. The diameter of the hole is preferably about fourinches. When the bore stem reaches first sight reliefhole 18, a pole is 32 having markings or graduations 33 is placed within the first sight reliefhole 18. The pole is used to determine the elevation ofthe downhole tool and bore stem. In the preftred method, the pole is used to measure & e distance between he downho ! e tooHagofthe bore stem and & e beam IS to ensure thatthegradeof the flowline bore is proper. If theborcstem is not atthe desued depth and along the proper Rne, the relevant adjustments are made using the controJs on the machine.
SpedjEkaUy,thecenterof & eboTestcmMoneatedat & eproperdepthan pilot hole (and ultimately the Bowline bore) is precisely positioned.
7U procm is continued ateach successive sigbt reliefhole 20 so that the bore stem is directed alongthe properpaths indicated by lines 34, 36 and38 in Fig. 1. Sincetheineand depth of the bore stem is precisely adjusted. to the properposition at each successive sight relief hole, the slight displacement of the bore stem that occurs between each, sithtre1iefhole is not compounded, and an extremely aoouratcpatb is defined. Finally, the borestem is directed along thepath indicated by line 40 from the last sight relief hole to the terminal hole 16.
With reference to Fig. 2, the pilot hole is shown at tennina1 hole 16. At this point, a conventional pre-reaming head is placed on theend ofthe borestem. Typically, thepre-reaming head is slightly Jargertban the outer diameter of the pipe to be p1aoed within the bore. For instance, if the flowline pipe to be placed in the bore is twelve inches in diameter, the pre-reaming head typicauy has a diameter ofabout twelve and one-lwfinches. The pre-reamer is pulled back through the pilot hole toward initial hole 14 in me direction of the anew in Fig. 3 to ibnn a bore mdicated schematic as numeral 42. During the pfeeamn process, the soil is mixed into a sluny by the
<Desc/Clms Page number 11>
injection of an aqueous solution water (and boring muds, concentrates and/or polymers) at the pKreaming head. The aqueous solution typically consists of water, boring Ruids, concentrates, and/or polymers as is knownin theart. Thesolutionmixes with the soilsothatit willflow and fillaround the pipe. This allows the pipe to be pulled in with less resistance and eliminates voids around the pipeasdescnbedbetowThe tooUng is conveadod fUWo 6 *, md B bs Thet < K'ng isconventionaIusewithdironaldriIlmgmadm to those of skin in the art. Namely, once the bore stem reaches the initial hole 14, the pr"eamiag head is removed and a pusse cap is placed on the bore ; stem. The pusbback cap is directed through pre-reamed hole 42 from initial hole 14 to terminal hole 16. Finally, as shown in Fig. 4, a pull cap is connected to the pipe and the pipe is pulled through the hole 42. As the pull cap 46 (shown schematically in Fig. 4) is pulled through the hole, the soil sluny is pushed by the pull cap I ; andpipe 44 into thesightreliefholes to relieve thepMssurebetween theboreesidewalls andthe pipe.
Press= Once the pipe is in place, the lelmfilled portion oftbe sight reliefholes are filled with gravel or other suitable material.
The horegoingmethods are moreaccuratcthanrelyMg upontheele < nicdniBctional means of the directional boring machine alone, and allow for Bowline bores having grades as slight as 02% to be installed on a consisftt basis since the pilot hole path Is drmod with great pzccision.
Also, the problems of accuracy of me machines at great depths are avoided by the use of the sight rejiefholes. Moreover, large diameterpipcsmaybedrilledwim accuracy using me methods ofthe current invention since pressure is relieved at each of me sight relief holes when the pipe is pulled into the aowline bore. Since the bore diameter does not have to greatly exceed the pipe diameter, the problems related to pipe float are similarly avoided.
<Desc/Clms Page number 12>
Thus, flowlines only reasonably feasible through open digging techniques may be directionally drilled without all the problems of safety, expense, environmental impact and impracticability as set forth above.
While the methods are described with reference to storm water and sewer lines, the W mefhodsmaybe used fbranypmcesswbeafadirectionaIborBts desire Forio$tancth$proccss may be used for placement ofnbefoptic cables undotDuod m ptaces provioIy presenting cost prohibitive obstacles and for longer length single bores.
From the foregoing it will be seen that this invention is one weu adapted to attain all ends and objects hereinabove set forth together with the other advantages which are obvious and srEichaeib o emC > . Itsbms6f > u md miXmPor which are inherentto thestmctute.It wiUbeTmderstoodthat ceftam features and subcombinations are of utility and may be employed without reference to other features and subcombinations. This is contemplated by and is within the scope of the claims.
Since many possible embodiments may be made of the invention without depattmg from the scope thereof, it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative of applications of the pnnciples of this invention, and not in a limiting sense.
Claims (11)
- CLAIMS !. A method ofdnuiog a flowline below the surface, the method computing the steps of : establisbiog a first sight reliefhole and a second sight rellefholealong the linear path ; positioning a directional drilling machine on the surface, the directional drilling machine havingaboring stem ; boring a first portion of a pilot hole from the surfaw to the first sight re1iefhole ; determining the elevation of the tool at the first sight reliefhole ; and 8 (ijusting the position of the tool at the first sight relief hole to a first desired depth : bonag a second portion of the pilot hole from the first sight rcliefhDIc to the second sigbt relief-hole, detenaining the elevation of the tool at the second sight relief hole. adjusting the position of the boring tool to a second desired depth.
- 2. The method of claim 1 further comprising reaming the pilot hole and locating the pipe.
- 3. The method of claim 1 wherein the position of the boring tool is determined by placing a measuring device within the fust or second sight reliefhole arid measuring the depth of the tool.I
- 4. The method of claim 3 wherein the depth of the tool is measured with re & fesce to a laser beam, the laser beam emittednomanansit located on the surface.
- 5. The method of claim 4 wherein each sight relief hole is generally vertical
- 6. The method of claim 1 further comprising :<Desc/Clms Page number 14>establishing a third sight relief hole ; boring a third portion of the pilot hole to the third sight relief hole;determining the position of the boring tool at the third sight relief hole, and siti Iief hole, adjusting the position of the boring tooL
- 7. The method of aim 6 wherein the second sight relief hole is equidistant nom theist and third sight relief holes.
- 8. A method for directionally boring a flowline, the method comprising the steps ofestablishing a number of sight rliefholes along the desired path of the bore ; -9 borp. directionaHy dolling a pilot hole : feaoung the material around the pilot hole to define a bore, the bore : filled at least partially filled with a slurry of the reamed material, and pulling apipe intothe bore wherein apoon oftheslunyis displaced into thesiM relief holes so that pressure does not develop around the pipe.
- 9. The method of claim 8 wherein the sight reliefholes are generally vertical.
- 10. The method of claim 9 wherein the sight reliefholes are spaced at equal distances from one another.
- 11. The method of claim 10 wherein the diameter of each sight reliefbole is greater or smaller than the diameter of the bore.<Desc/Clms Page number 15>12 The method of claim 8 wherein directionally drilling the pilot hole includes checking the depth of the pilot hole at each sight relief hole prior to drllling to the next sight relief hole on the linear path.
Priority Applications (14)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0205389A GB2386139B (en) | 2002-03-07 | 2002-03-07 | Method of forming a trenchless flowline |
| HU0303521A HUP0303521A3 (en) | 2001-03-19 | 2002-03-13 | Method of forming a trenchless flowline |
| DE60206167T DE60206167T2 (en) | 2001-03-19 | 2002-03-13 | METHOD FOR THE CIVIL LAYOUT OF FLOW LINES |
| AT02703751T ATE304646T1 (en) | 2001-03-19 | 2002-03-13 | METHOD FOR TRENCHLESS LAYING FLOW LINES |
| CA002440876A CA2440876C (en) | 2001-03-19 | 2002-03-13 | Method of forming a trenchless flowline |
| PL364003A PL198325B1 (en) | 2001-03-19 | 2002-03-13 | Method of forming a trenchless flowline |
| CZ20032533A CZ20032533A3 (en) | 2001-03-19 | 2002-03-13 | Method of making hole for piping without excavation work |
| RU2003130750/03A RU2003130750A (en) | 2001-03-19 | 2002-03-13 | METHOD FOR EDUCING A CHANNEL FOR LAYING A HEAD PIPELINE WITHOUT DIGGING A Trench |
| AU2002237434A AU2002237434B2 (en) | 2001-03-19 | 2002-03-13 | Method of forming a trenchless flowline |
| BR0208218-7A BR0208218A (en) | 2001-03-19 | 2002-03-13 | Method of Forming a Flow Line Without a Trench |
| MXPA03008536A MXPA03008536A (en) | 2001-03-19 | 2002-03-13 | Method of forming a trenchless flowline. |
| EP02703751A EP1395729B1 (en) | 2001-03-19 | 2002-03-13 | Method of forming a trenchless flowline |
| PCT/GB2002/001026 WO2003031762A1 (en) | 2001-03-19 | 2002-03-13 | Method of forming a trenchless flowline |
| BG108278A BG108278A (en) | 2001-03-19 | 2003-10-16 | Method of forming a trenchless flowline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0205389A GB2386139B (en) | 2002-03-07 | 2002-03-07 | Method of forming a trenchless flowline |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0205389D0 GB0205389D0 (en) | 2002-04-24 |
| GB2386139A true GB2386139A (en) | 2003-09-10 |
| GB2386139B GB2386139B (en) | 2005-11-30 |
Family
ID=9932512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0205389A Expired - Fee Related GB2386139B (en) | 2001-03-19 | 2002-03-07 | Method of forming a trenchless flowline |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2386139B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0209217A2 (en) * | 1985-05-14 | 1987-01-21 | Cherrington Corporation | Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein |
| WO1988008480A1 (en) * | 1987-04-21 | 1988-11-03 | Horizontal Drilling International | Process for installing an underground pipe and the installation concerned |
| EP0360321A1 (en) * | 1988-09-16 | 1990-03-28 | VISSER & SMIT HANAB B.V. | Process for laying a pipeline through an earth mass |
| US5580188A (en) * | 1995-07-17 | 1996-12-03 | Nowak Construction Co., Inc. | Method for replacing buried pipe |
| GB2301415A (en) * | 1994-02-22 | 1996-12-04 | Timothy R Coss | Trenchless pipeline installation method with pilot hole corrective alignment |
| JP2001193050A (en) * | 2000-01-06 | 2001-07-17 | Penta Ocean Constr Co Ltd | Ground improvement method directly underneath large- scaled structure |
-
2002
- 2002-03-07 GB GB0205389A patent/GB2386139B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0209217A2 (en) * | 1985-05-14 | 1987-01-21 | Cherrington Corporation | Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein |
| WO1988008480A1 (en) * | 1987-04-21 | 1988-11-03 | Horizontal Drilling International | Process for installing an underground pipe and the installation concerned |
| EP0360321A1 (en) * | 1988-09-16 | 1990-03-28 | VISSER & SMIT HANAB B.V. | Process for laying a pipeline through an earth mass |
| GB2301415A (en) * | 1994-02-22 | 1996-12-04 | Timothy R Coss | Trenchless pipeline installation method with pilot hole corrective alignment |
| US5580188A (en) * | 1995-07-17 | 1996-12-03 | Nowak Construction Co., Inc. | Method for replacing buried pipe |
| JP2001193050A (en) * | 2000-01-06 | 2001-07-17 | Penta Ocean Constr Co Ltd | Ground improvement method directly underneath large- scaled structure |
Non-Patent Citations (1)
| Title |
|---|
| WPI abstract no. 2001-507998 & JP 2001193050 A * |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0205389D0 (en) | 2002-04-24 |
| GB2386139B (en) | 2005-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100410485C (en) | Construction method for push pipe by cooperation of horizontal auger driller and horizontal directional driller | |
| CN112984213B (en) | Non-excavation directional drilling pipe laying construction method | |
| CN103791159A (en) | Pipe-jacking construction method for small-diameter pipes | |
| CN101906787B (en) | Construction and processing method of great deep vertical inclinometer pipe in stratum containing gravels | |
| US6732816B2 (en) | Method of forming a trenchless flowline | |
| CN112727365B (en) | Construction method for trenchless horizontal directional drilling of underpass existing railway | |
| CN113107368B (en) | Full-casing geological investigation construction method | |
| AU2002237434B2 (en) | Method of forming a trenchless flowline | |
| Burden et al. | Synthesis of trenchless technologies. | |
| GB2386139A (en) | Method of forming a trenchless flowline | |
| CN116756940A (en) | Push pipe engineering design and construction method based on stress performances of different geological environments | |
| AU2002237434A1 (en) | Method of forming a trenchless flowline | |
| CN2892966Y (en) | Drill hole pile bulkhead plate | |
| Najafi et al. | Preparation of construction specifications, contract documents, field testing, educational materials, and course offerings for trenchless construction | |
| CN111287763A (en) | Control method for preventing subway shield tunnel from long-term settlement | |
| CN110820899A (en) | Expansion pipe type pipeline updating construction method for increasing stress release hole | |
| Mok et al. | A perspective of pipejacking works by tunnel boring machines in Hong Kong: part II–applications, problems encountered, cost and prospects | |
| Varghese et al. | A Review on Zero Degree Horizontal Directional Drilling | |
| Sarkar | Trenchless Technology in India—An Overview | |
| Pipe Ramming Task Force | Pipe Ramming | |
| Mercer | Guided microtunnelling equipment for small-diameter utility installation | |
| Sinna | Application of trenchless construction technology in construction of water supply and drainage in urban road construction | |
| Najafi et al. | Ground Displacement Monitoring During Horizontal Directional Drilling & Other Trenchless Installations | |
| CN117989388A (en) | Horizontal directional drilling dragging jacking pipe device and construction method | |
| Kramer et al. | Pipe jacking and microtunnelling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20190307 |