HEAVY ROAD GRADING JOB PIONEERED FROM ONE END

A 6-1/2-MILE HIGHWAY GRADING JOB THROUGH TIMBERED MOUNTAIN TERRAIN WAS STARTED BY PIONEERING EQUIPMENT TRAILS ALL THE WAY THROUGH FROM A SINGLE END. THE ACCESS ROADS FOR CONSTRUCTION OF THE SEGMENT OF HIGHWAY 181 STAYED STRICTLY WITHIN THE RIGHT-OF-WAY. AS EQUIPMENT BEGAN WORKING AT THE VARIOUS HILLTOP AND CULVERT LOCATIONS, THE TRAILS WERE PROGRESSIVELY IMPROVED, INTO HAUL-WAYS. THREE STATE ROADS CUT ACROSS THE PROJECT LINE. HOWEVER, LOAD LIMITS AND NARROW WIDTHS OF BRIDGES RULED THEM OUT FOR HEAVY-EQUIPMENT ACCESS. UNDERDRAINS PROVED DIFFICULT TO INSTALL THROUGH THE MARSHY, SPRINGFED GROUND, WHICH AFFORDED INSUFFICIENT FOOTING FOR BACKHOES AND TRUCKS, EVEN DURING FREEZING WEATHER. BY SPRING, EQUIPMENT NEEDED AT THE VARIOUS SITES WAS ON LOCATION, AND THE DRILLSHOT AND EXCAVATION WORK AT HILLTOPS STARTED. THE HEAVY EQUIPMENT USED IS DESCRIBED. TIMBER ALONG THE RIGHT-OF-WAY WAS LOGGED AND STUMPED AS THE JOB ADVANCED. DRILL-SHOOT METHODS ARE PRESENTED. EQUIPMENT FOR DRILLING IN SOLID ROCK IS DESCRIBED. ROCK CUTS ARE NOT PRESPLIT, BUT BATTERED BACK TO A SAFE ANGLE. OF THE PROJECT'S 5 MILLION CUBIC YARDS ABOUT 4-1/2 MILLION MUST BE BLASTED. THE STATE ROADS MUST REMAIN OPEN DURING CONSTRUCTION.

  • Supplemental Notes:
    • Vol 22, No 9, PP 29-31, 5 PHOT
  • Publication Date: 1969-9

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Filing Info

  • Accession Number: 00215239
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 16 1970 12:00AM