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ELECTRIC: Model US 900 and US 1600 (see page 16) or USL-900 & 1600. High Frequency
Vibrators with speeds up to 10000 VPM (vibrations per minute) 115 volt single phase, can be plugged into
any 115 volt light line or used with field generators. Unaffected by line voltage drops. Speed and impact can
be adjusted with rheostat. Universal type motor is totally enclosed and not affected by water drips or concrete spill. Easy to handle, total weight 35 lbs., low in cost. The high frequency and low amplitude give optimum densification and a perfectly smooth surface finish. Their high frequency will reduce vibration time
allowing lower slump concrete to be used, permitting faster stripping of forms. Model 2P-200 and 2P-450 or 2PL-900 & 1600 low speed, 3600 rpm, high amplitude, single or three phase. Will give up to 12? penetration with excellent surface finish. Totally enclosed units. Excellent to use where deep penetration is needed and where large surfaces have to be vibrated without moving vibrator. PNEUMATIC: Model CCF-2000 with speeds to 6000 VPM and SCR-4000 High Frequency Pneumatic with speeds up to 10-12,000 vibrations per minute. Will have same effect on concrete as Model US-900 and US- 1600 above. BRACKETS: For wood forms use wood form bracket, see page 10. For steel forms or wood form with steel stiffeners use clamp-on brackets. VIBRATOR PENETRATION: 2PL-900, US-900, US-1600, CC?s-2000, SVRS-4000, 2PL-900: 4 to 6?; 2PL-1600: 6 to 8?. For walls over 6? use vibrators (staggered) on both sides of the wall. EFFECTIVE VIBRATION AREA 2PL-900, CC?s-2000, US-900: 3?- 5? radius US-1600, SVR?s-4000: 4?- 6? radius 2P-450; 2PL-1600 3?- 5? radius FIELD GENERATORS: US-900 & USL-1600 single phase 115 volt not susceptible to long cables, or variation of voltage output by generator, unit will only slow down in speed for voltage drops. 2P-450 single phase 115 volt or 230 volt can only take ?50 voltage variation and need field generators that can hold an even output. When long cables are used, over 20?, make sure voltage test is taken of vibrator when running. If voltage drop is more than 5%, use larger wire in extension cord (if, for example, 16/3 cord used, change to 14/3 to minimize voltage drop). FORMULA FOR SIZING 1. Find total weight of concrete and form. 2. TOTAL WEIGHT OF CONCRETE + TOTAL WEIGHT OF FORM _________________________ = vibrator force needed for total job. 2 For example: Wall forms on preceding page 8? x20? xl wall; total weight of concrete 11,200 lbs ; total weight of form 3200 lbs.; total weight 14,400 lbs. Divide total weight by 2 to get total vibrator force needed. 14,400 ? 2 = 7,200 lbs. of vibrator force needed. Model 2P-450 was selected with maximum force of 900 lbs. Divide vibrator force needed by maximum force of vibrator to find how many vibrators needed to complete job. 7,200 +900 = Vibrators. NOTE: When placing vibrators, divide amount on both sides and stagger. 2P-450 effective radius 3 to 5?. TIPS: If internal vibrators are used, do not start external vibrators until internals have stopped or moved to a higher position. Reason ? internal vibrators throw air bubbles away from vibrator head against form side leaving air holes and pockets on surface. External vibrators throw air bubbles into mix, up and out, leaving surface against form smooth and blemish free. Start vibration when concrete reaches vibrators. Keep on vibrating until no more air bubbles are breaking on the surface and a glistening slick surface appears on the top of the concrete and next vibrator can be started. |
Concrete Columns Concrete Septic Tanks and Vaults Concrete Steps Tampers and Trowels Screeds Precast Forms Concrete Pipes Manholes and Box Culverts Concrete Tunnels 75 STILSON RD, P.O. Box 8 WYOMING, RI 02898 Phone: (401) 539-2392 (800) 633-0032 Fax: (401) 539-2584 E-Mail:vibrators@vibco.com Read more industry news on the VIBCO Vibrators Blog |