SAFETY BARRIERS SLIPFORMED IN TWO STEPS

IN THIS PROCESS, ONE MACHINE WITH A COMBINATION MULE, PLACED FOOTER AND GUTTER SIMULTANEOUSLY WHILE A SECOND FOLLOWED CLOSE BEHIND SHIPPING A CONCRETE SAFETY BARRIER. THE DIESEL POWERED SLIPFORMING SYSTEM EMPLOYS SIDE MOUNTED MULES AND BY BEING INSTALLED AS LEFT HAND UNITS, THE TWO MACHINES WERE ABLE TO MOVE WITH TRAFFIC IN THE INTEREST OF PRODUCTION SAFETY. ONLY ONE LANE OF ACCESS WAS REQUIRED TO BRING READY MIX TRUCKS UP TO THE FORWARD HOPPERS WHICH COMPRISE PART OF THE UNIT'S 1.5 CU YD ON-BOARD SUPPLY. AN ADVANTAGE IN SIDE MOUNTING MULES IS THAT THEY CAN GET CLOSE TO BRIDGE ABUTMENTS AND ADJACENT WALLS ALREADY POURED. THE CONFIGURATION OF THE FOOTER MULE ALLOWED PLACING THE REINFORCING MESH DIRECTLY INTO THE MULE AS IT PROGRESSED UNDER THE MACHINE'S AUTOMATED GUIDANCE ALONG THE STRING LINE. SEVEN TRUCKS SUPPLIED THE FOOTER CURBER UNIT WITH CONCRETE HAVING A 1.5 TO 2 IN. SLUMP. THE FOOTER AND CURBING WAS POURED AT RATES PEAKING NEAR 4000 FT. PER 8 HOUR SHIFT. ONLY ONE OPERATOR PER MACHINE WAS REQUIRED. THE WALL MEASURES 32 IN. IN HEIGHT, AND IS 20 IN. THICK AT ITS BASE, TAPERING TO 6 IN. AT ITS HEAD. A 1 IN. SLUMP WAS REQUIRED FOR THE CONCRETE USED AND THIS CALLED FOR CAREFUL CONTROL AT THE SOURCE OF SUPPLY. IN THIS PROCEDURE WHICH HAS BEEN TERMED A 'LIFE SAVER' IN BOTH THE TECHNICAL AND ECONOMIC SENSE, THE WALL WAS SLIPPED AT A RATE OF 3900 FT. PER 8 HOUR SHIFT.

• Publication Date: 1973-2

Media Info

• Features: Photos;
• Pagination: p. 98
• Serial:
  • Roads and Streets
  • Volume: 116
  • Issue Number: 2
  • Publisher: Donnelley (Reuben H) Corporation

Subject/Index Terms

• TRT Terms: Concrete structures; Construction management; Equipment; Fences; Gutters; Safety; Slip form pavers
• Old TRIS Terms: Gutter /appurtenance/; Safety fence (Excludes guard rail); Slip forms
• Subject Areas: Construction; Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00215633
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 9 1973 12:00AM