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- Q1628173 subject Q8390109.
- Q1628173 subject Q8823588.
- Q1628173 subject Q8872174.
- Q1628173 abstract "Directional boring, commonly called horizontal directional drilling or HDD, is a steerable trenchless method of installing underground pipe, conduit, or cable in a shallow arc along a prescribed bore path by using a surface-launched drilling rig, with minimal impact on the surrounding area. Directional boring is used when trenching or excavating is not practical. It is suitable for a variety of soil conditions and jobs including road, landscape and river crossings. Pipe can be made of materials such as PVC, polyethylene, polypropylene, Ductile iron, and steel as long as it can be pulled through the drilled hole. Directional boring is not practical if there are voids in the rock or incomplete layers of rock. The best material is solid rock or sedimentary material. Soils with cobble stone are not recommended. There are different types of heads used in the pilot-hole process, and they depend on the geological material.".
- Q1628173 thumbnail Ditch_Witch_All_Terrain_JT100_at_Sunset.jpg?width=300.
- Q1628173 wikiPageExternalLink dbapamphlet.htm.
- Q1628173 wikiPageWikiLink Q11427.
- Q1628173 wikiPageWikiLink Q121359.
- Q1628173 wikiPageWikiLink Q122490.
- Q1628173 wikiPageWikiLink Q128709.
- Q1628173 wikiPageWikiLink Q13424734.
- Q1628173 wikiPageWikiLink Q1422489.
- Q1628173 wikiPageWikiLink Q143429.
- Q1628173 wikiPageWikiLink Q146174.
- Q1628173 wikiPageWikiLink Q146368.
- Q1628173 wikiPageWikiLink Q191118.
- Q1628173 wikiPageWikiLink Q2919821.
- Q1628173 wikiPageWikiLink Q3314862.
- Q1628173 wikiPageWikiLink Q3493807.
- Q1628173 wikiPageWikiLink Q380149.
- Q1628173 wikiPageWikiLink Q627111.
- Q1628173 wikiPageWikiLink Q681566.
- Q1628173 wikiPageWikiLink Q6931482.
- Q1628173 wikiPageWikiLink Q7921520.
- Q1628173 wikiPageWikiLink Q81163.
- Q1628173 wikiPageWikiLink Q8390109.
- Q1628173 wikiPageWikiLink Q8823588.
- Q1628173 wikiPageWikiLink Q8872174.
- Q1628173 comment "Directional boring, commonly called horizontal directional drilling or HDD, is a steerable trenchless method of installing underground pipe, conduit, or cable in a shallow arc along a prescribed bore path by using a surface-launched drilling rig, with minimal impact on the surrounding area. Directional boring is used when trenching or excavating is not practical. It is suitable for a variety of soil conditions and jobs including road, landscape and river crossings.".
- Q1628173 label "Directional boring".
- Q1628173 depiction Ditch_Witch_All_Terrain_JT100_at_Sunset.jpg.