MACHINE-DRIVING OF WOODEN POSTS

WOOD IS AN EXCELLENT MATERIAL FOR HIGHWAY GUARDRAIL POSTS BECAUSE COMPARISON SHOWS IT HAS BETTER STRENGTH CHARACTERISTICS, LOWER INITIAL COSTS, A LOWER COST PER INSTALLED POST AND A SERVICE LIFE OF THIRTY YEARS. HOWEVER, WOOD IS NOT OFTEN USED BECAUSE OF THE SLOW SPEED OF INSTALLATION. A MOBILE POST DRIVER WAS DEVELOPED TO INSTALL POSTS ON A VARIETY OF SITES. STUDY INDICATES NOW WITH THE IMPROVED RATE OF INSTALLATION WOOD IS NOW COMPETITIVE WITH THAT OF MACHINE-DRIVEN STEEL FOR GUARD RAILS. IT IS CONCLUDED THAT WOODEN POSTS CAN BE DRIVEN ON ANY SITE WHERE STEEL POSTS CAN BE DRIVEN. ON SITES FREE OF LARGE ROCKS OR OTHER OBSTRUCTIONS, GUARDRAIL SUBCONTRACTORS CAN EXPECT TO INSTALL AROUND 2500 LIN. FT. OF GUARDRAIL LINE PER 8-HR. SHIFT WITH THE TYPE OF EQUIPMENT USED HERE. ON THE SAME SITE, POSTS CAN BE FED AT LEAST TWICE AS FAST BY MACHINE- DRIVING AS BY HAND-SETTING. THE INSTALLED COST OF MACHINE- DRIVEN WOODEN POSTS IS $1 TO $3.25 LESS THAN THAT OF DRIVEN STEEL. FOR MACHINE-DRIVING, POSTS WITH BLUNT BOTTOMS ARE PREFERABLE TO THOSE WITH SLOPES. THE DRIVING ACTION WILL CAUSE NO DAMAGE TO THE TOPS OF PROPERLY MACHINED WOODEN POSTS. WOODEN-POST DRIVING TIME IS ABOUT DIRECTLY PROPORTIONAL TO CROSS-SECTIONAL AREA.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 89-98
  • Monograph Title: Guardrails, median barriers and sign and light supports
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00203334
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 5 1994 12:00AM