HAND LABOR CUT ON SHORT RUNS BY SELF-PROPELLED SCREED

SELF-PROPELLED PIPE SCREEDS ARE BEING USED IN WIDENING STREETS AT A LOS ANGELES INTERSECTION, ELIMINATING MUCH OF THE HAND LABOR ORDINARILY INVOLVED IN PAVING CITY STREETS. A THREE-ROLLER RIG WITH CABLE-CONNECTED ENGINES AT EACH END, TURNS OUT FINISHED CONCRETE AT GOOD SPEED. BREAKER REDUCES OLD SLAB TO SMALL PIECES THAT LOADER SIDE-DUMPS TO TRUCKS. THE LEAD PIPE ROLLER, SET A LITTLE ABOVE THE FINISH PLANE, VIBRATES ON ECCENTRIC MOUNTINGS TO STRIKE OFF AND COMPACT CONCRETE AS IT SPINS. THE SECOND AND THIRD ROLLERS SCREED AND FINISH AS WELL AS PROPEL AND, LIKE THE LEAD ROLLER, CAN BE REVERSED. THE SCREED WORKS CLOSE TO TRANSMIT-MIX CHUTE. LEAD ROLLER IS FOLLOWED BY TWO ADDITIONAL ROLLERS THAT ALSO PROPEL RIG. SCREED CAN WORK UP TO 600 RPM TO OBTAIN A SMOOTH FINISH ON THE CONCRETE. ACCURACY OF THE PROFILE IS DETERMINED BY THE TOPS OF THE HEADERS OR OF THE ABUTTING SLABS ON WHICH THE SCREED RIDES. THE SELF-PROPELLED SCREEDS DO NOT NEED A TIGHT-LINE AS THEY TRAVEL DOWN THE SLAB, AND OCCASIONAL ADJUSTMENTS IN DIRECTION ARE MADE BY OPERATORS TO KEEP THE RIGS FROM RUNNING OUT OF OVERHANG ON EACH SIDE.

• Supplemental Notes:
  • Vol 51, No 12, PP 46-49, 6 PHOT
• Publication Date: 1969-12

Media Info

• Serial:
  • Construction Methods and Equipment
  • Publisher: McGraw-Hill, Incorporated

Subject/Index Terms

• TRT Terms: Concrete finishing; Economics; Human powered vehicles; Pavement widening; Pipe; Rollers; Screeds; Vibratory compaction
• Old TRIS Terms: Self propelled
• Subject Areas: Economics; Highways; Maintenance and Preservation;

Filing Info

• Accession Number: 00218556
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 9 1970 12:00AM