1、Designation: F1962 11Standard Guide forUse of Maxi-Horizontal Directional Drilling for Placement ofPolyethylene Pipe or Conduit Under Obstacles, IncludingRiver Crossings1This standard is issued under the fixed designation F1962; the number immediately following the designation indicates the year ofo
2、riginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This guide describes the design, selectionconsiderations, a
3、nd installation procedures for the placement ofpolyethylene pipe or conduit below ground using maxi-horizontal directional drilling equipment.The pipes or conduitsmay be used for various applications includingtelecommunications, electric power, natural gas, petroleum,water lines, sewer lines, or oth
4、er fluid transport.1.2 Horizontal directional drilling is a form of trenchlesstechnology. The equipment and procedures are intended tominimize surface damage, restoration requirements, and dis-ruption of vehicular or maritime traffic with little or nointerruption of other existing lines or services.
5、 Mini-horizontaldirectional drilling (min-HDD) is typically used for the rela-tively shorter distances and smaller diameter pipes associatedwith local utility distribution lines. In comparison, maxi-horizontal directional drilling (maxi-HDD) is typically used forlonger distances and larger diameter
6、pipes common in majorriver crossings. Applications that are intermediate to themini-HDD or maxi-HDD categories may utilize appropriate“medi” equipment of intermediate size and capabilities. In suchcases, the design guidelines and installation practices wouldfollow those described for the mini- or ma
7、xi-HDD categories,as judged to be most suitable for each situation.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 This standard
8、does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of the regulatory limitations prior to use. Section 6contains general sa
9、fety information related to the use ofmaxi-horizontal directional drilling equipment.2. Referenced Documents2.1 ASTM Standards:2D420 Guide to Site Characterization for Engineering Designand Construction Purposes (Withdrawn 2011)3D422 Test Method for Particle-Size Analysis of SoilsD1586 Test Method f
10、or Penetration Test (SPT) and Split-Barrel Sampling of SoilsD1587 Practice for Thin-Walled Tube Sampling of Soils forGeotechnical PurposesD2113 Practice for Rock Core Drilling and Sampling ofRock for Site ExplorationD2166 Test Method for Unconfined Compressive Strengthof Cohesive SoilD2435 Test Meth
11、ods for One-Dimensional ConsolidationProperties of Soils Using Incremental LoadingD2447 Specification for Polyethylene (PE) Plastic Pipe,Schedules 40 and 80, Based on Outside Diameter (With-drawn 2010)3D2513 Specification for Polyethylene (PE) Gas PressurePipe, Tubing, and FittingsD2850 Test Method
12、for Unconsolidated-Undrained TriaxialCompression Test on Cohesive SoilsD3035 Specification for Polyethylene (PE) Plastic Pipe (DR-PR) Based on Controlled Outside DiameterD4186 Test Method for One-Dimensional ConsolidationProperties of Saturated Cohesive Soils Using Controlled-Strain LoadingD4220 Pra
13、ctices for Preserving and Transporting SoilSamplesD4318 Test Methods for Liquid Limit, Plastic Limit, andPlasticity Index of SoilsD4767 Test Method for Consolidated Undrained TriaxialCompression Test for Cohesive Soils1This guide is under the jurisdiction of ASTM Committee F17 on Plastic PipingSyste
14、ms and is the direct responsibility of Subcommittee F17.67 on TrenchlessPlastic Pipeline Technology.Current edition approved May 1, 2011. Published May 2011. Last previousedition approved in 2005 as F1962051. DOI: 10.1520/F1962-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org,
15、 orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the e
16、nd of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1D5084 Test Methods for Measurement of Hydraulic Con-ductivity of Saturated Porous Materials Using a FlexibleWall PermeameterF714 Specification for Polyethylene (PE) Pl
17、astic Pipe (DR-PR) Based on Outside DiameterF1804 Practice for Determining Allowable Tensile Load forPolyethylene (PE) Gas Pipe During Pull-In InstallationF2620 Practice for Heat Fusion Joining of Polyethylene Pipeand Fittings2.2 Other Standards:ANSI Preferred Number Series 10ANSI/EIA/TIA-590 Standa
18、rd for Physical Location and Pro-tection of Below-Ground Fiber Optic Cable Plant4OSHA-3075 Controlling Electrical Hazards5TR-NWT-000356 Generic Requirements for Optical CableInnerduct63. Terminology3.1 Definitions:3.1.1 horizontal directional drilling, HDD, na techniquefor installing pipes or utilit
19、y lines below ground using asurface-mounted drill rig that launches and places a drill stringat a shallow angle to the surface and has tracking and steeringcapabilities.3.1.1.1 DiscussionThe drill string creates a pilot bore holein an essentially horizontal path or shallow arc which maysubsequently
20、be enlarged to a larger diameter during a second-ary operation which typically includes reaming and thenpullback of the pipe or utility line. Tracking of the initial borepath is accomplished by a manually operated overhead receiveror a remote tracking system. Steering is achieved by control-ling the
21、 orientation of the drill head which has a directionalbias and pushing the drill string forward with the drill headoriented in the direction desired. Continuous rotation of thedrill string allows the drill head to bore a straight path. Theprocedure uses fluid jet or mechanical cutting, or both, with
22、 alow, controlled volume of drilling fluid flow to minimize thecreation of voids during the initial boring or backreamingoperations. The drilling fluid helps stabilize the bore hole,remove cuttings, provide lubricant for the drill string andplastic pipe, and cool the drill head. The resultant slurry
23、surrounds the pipe, typically filling the annulus between thepipe and the bored cavity.3.1.2 maxi-horizontal directional drilling, maxi-HDD, naclass of HDD, sometimes referred to as directional drilling, forboring holes of up to several thousand feet in length andplacing pipes of up to 48 in. (114 m
24、) diameter or greater atdepths up to 200 ft (60 m).3.1.2.1 DiscussionMaxi-HDD is appropriate for placingpipes under large rivers or other large obstacles (Fig. 1).Tracking information is provided remotely to the operator ofthe drill rig by sensors located towards the leading end of thedrill string.
25、Cutting of the pilot hole and expansion of the holeis typically accomplished with a bit or reamer attached to thedrill pipe, which is rotated and pulled by the drilling rig.3.1.3 mini-horizontal directional drilling, mini-HDD, naclass of HDD, sometimes referred to as guided boring, forboring holes o
26、f up to several hundred feet in length and placingpipes of typically 12 in. (300 mm) or less nominal diameter atdepths typically less than 25 ft (7 m).3.1.3.1 DiscussionPolyethylene pipe selection and usagefor mini-HDD is discussed extensively in the Plastics PipeInstitutes (PPI) TR-46, “Guidelines
27、for Use of Mini-Horizontal Directional Drilling for Placement of High DensityPolyethylene Pipe.” (1)73.1.3.2 DiscussionMini-HDD is appropriate for placinglocal distribution lines (including service lines or laterals)beneath local streets, private property, and along right-of-ways.The creation of the
28、 pilot bore hole and the reaming operationsare typically accomplished by fluid jet cutting or the cuttingtorque provided by rotating the drill string, although mudmotors powered by the drilling fluid are sometimes used forhard or rocky soil conditions. The use of such mud motorswould only be applica
29、ble for the larger mini-HDD machines.The locating and tracking systems typically require a manuallyoperated overhead receiver to follow the progress of the initialpilot bore. The receiver is placed above the general vicinity ofthe drill head to allow a determination of its precise location4Available
30、 from the Electronics IndustriesAssociation, 2001 PennsylvaniaAve.,N.W., Washington, DC, 20006.5Available from the Occupational Health and Safety Administration, 200Constitution Ave. N.W. Washington, DC 20210.6Available from Bellcore, 60 New England Ave., Room 1B252, Piscataway, NJ,08854-4196.7The b
31、oldface numbers in parentheses refer to the list of references at the end ofthis standard.FIG. 1 Maxi-HDD for Obstacle (for example, River) CrossingF1962 112and depth, indicate drill head orientation for determiningsteering information to be implemented from the drill rig.3.1.4 pipe dimension ratio,
32、 DR, nthe average specifieddiameter of a pipe divided by the minimum specified wallthickness.3.1.4.1 DiscussionFor pipes manufactured to a controlledoutside diameter (OD), the DR is the ratio of pipe outerdiameter to minimum wall thickness. The standard dimensionratio (SDR) is a specific ratio of th
33、e outside diameter to theminimum wall thickness as specified by ANSI PreferredNumber Series 10.NOTE 1Lower DR values correspond to thicker, stronger pipes.4. Preliminary Site Investigation4.1 General ConsiderationsA maxi-HDD project, such asthat associated with a river crossing, is a major event tha
34、t willrequire extensive and thorough surface and subsurface inves-tigations. Qualified geotechnical engineers should perform thework for the owner in preparation for planning and designingof the bore route. The information should also be provided tothe potential contractors to provide guidance for t
35、he biddingstage and subsequent installation. The contractor may performadditional investigations, as desired. Since typical maxi-HDDprojects represent river crossings, the following procedures aredescribed in terms of the specific investigations and issuesarising in such cases. The general procedure
36、s, however, may beappropriately interpreted to also apply to non-river crossings,such as under land-based obstacles including highways,railways, etc.4.2 Surface Investigation (2, 3)4.2.1 Topographic SurveyA survey should be conductedto accurately define the working areas described in 4.1 for theprop
37、osed crossing site. Horizontal and vertical references mustbe established for referencing hydrographic and geotechnicaldata. The survey should typically include overbank profiles onthe anticipated path center-line, extending about 150 ft (75 m)landward of the bore entry point to the length of the (p
38、re-fabricated) pull section landward of the bore exit point. Thesurvey information should be related to topographical featuresin the vicinity of the proposed crossing. Existing topographicalinformation may be available from the U.S. Geological Survey,or Federal, state, or county publications. Aerial
39、 photographs orordnance surveys may be useful, especially for crossingland-based obstacles in urban areas, since these may indicatethe presence of demolished buildings and the possibility of oldfoundations, as well any filled areas (4). It is also necessary tocheck available utility records to help
40、identify the preciselocation of existing below-ground facilities in the vicinity,including electric power, natural gas, petroleum, water, sewer,or telecommunications lines. The presence of existingpipelines, support pilings, etc., containing significant steelmass should be noted since this may cause
41、 interference withmagnetically sensitive equipment guidance or location instru-mentation.4.2.1.1 Drill Rig (Bore Entry) SideThe available arearequired on the side of the drill rig must be sufficient for the rigitself and its ancillary equipment. In general, the size of therequired area on the rig si
42、de will depend upon the magnitude ofthe operation, including length of bore and diameter of pipe tobe placed. Typically, a temporary workspace of approximately150 ft (45 m) width by 250 ft (75 m) length will be sufficient.These dimensions may vary from 100 by 150 ft (30 by 45 m)for shorter crossings
43、 of 1000 ft (300 m) or less, to 200 by 300ft (60 by 90 m) for medium or long crossings.4.2.1.2 Water SupplyWater storage and facilities formixing, storing, and pumping drilling fluid will require signifi-cant space.Although it is standard practice to draw fresh waterfound at the location for mixing
44、the drilling fluid, alternatewater supplies may be required to obtain proper drilling fluidcharacteristics. Hard or salty water is undesirable, althoughadditives may be used to create the proper pH value. It may benecessary to provide access for trucks to transport water or toprovide for the install
45、ation of a relatively long surface pipe orhose connecting a remote hydrant.4.2.1.3 Pipe (Bore Exit) SideAssuming the pipe to beplaced is too large a diameter to be supplied on a reel (forexample, larger than 6 in. (150 mm), sufficient space isrequired at the side opposite that of the drill rig, wher
46、e the borewill exit and the pipe be inserted, to accommodate a continuousstraight length of pre-fabricated pipe. The space for the straightlength will begin approximately 50 to 100 ft (15 to 30 m) fromthe anticipated bore exit and extend straight landward at awidth of 35 to 50 ft (10 to 15 m), depen
47、ding upon the pipediameter. In the immediate vicinity of the bore exit (pipeentry), an area of typically 50 ft (15 m) width by 100 ft (30 m)length is required; for relatively large diameter pipes (largerthan 24 in. (600 mm), or in cases of difficult soil conditions, anarea of 100 ft (30 m) width by
48、150 ft (45 m) length should beprovided.4.2.2 Hydrographic/Potamological SurveyFor crossingsignificant waterways, a survey should be conducted to accu-rately describe the bottom contours and river stability toestablish suitability for the design life of the pipeline.Typically, depths should be establ
49、ished along the anticipatedcenter-line, and approximately 200 ft (60 m) upstream anddownstream; closer readings may be required if it is necessaryto monitor future river activity. Consideration should be givento future changes in river bank terrain. Washouts, bankmigrations, or scour can expose pipe.4.2.3 Drilling Fluid DisposalThe means for disposal ofthe drilling fluid wastes must be considered. The volume ofdrilling fluid used will depend upon the soil characteristics butis typically on the order of 1 to 3 times the volume of removedsoil. Most drilling fluids
