VIBRATORS MOST COMMONLY USED ON SEPTIC TANKS & BURIAL VAULTS

PORTABLE & ELECTRIC

Model US-900 & US-WOO high frequency vibrators up to 10,000 vibrations per minute. Easy 115 volt plug in, low amperage and can be plugged into any light outlet. US-900 is mounted on a wedge bracket model UW2 (pages 2-4). The UWF female bracket is welded to the form (see mounting below). The US-WOO is mounted on a UW-3 wedge. The US-900 is used on standard septic tanks, US-1600 on larger ones.

IMPORTANT NOTE: High Frequency Electric Vibrators are intermittent duty units with a maximum "on" time per hour of 30 minutes. If vibration time extends beyond the duty time, use two units and leapfrog them from form to form.

The wedge brackets transfer vibration up to 90%. For 100% transfer use Model USL-900 & USL 1600 with lug bracket. For Burial Vaults use Model USP-900.

PORTABLE PNEUMATIC

For Septic Tanks use Model SVRWS-4000 Silent High Frequency Vibrator up to 11,000 VPM. This unit is recommended for the larger forms and GCW-2000. Silent Pneumatic Vibrator is recommended for the smaller forms. GGW-2000 is pre lubricated for life and the SVRWS-4000 needs to be lubricated from an oiler in the airline. For burial vaults use VSP-510 silent pneumatic turbine vibrator pre lubricated for life.

PERMANENTLY MOUNTED VIBRATORS

Many concrete producers choose to mount the vibrator permanently on the forms to save time, lower labor cost, and reduce handling of the equipment & save repair cost.

Suggested vibrators for permanent mountings are Electric Model US-900 for standard septic tanks and burial vaults, US- 1600 in single phase or 2P-200 in 3 phase of the pneumatic unit Model CCF-2000 for standard septic tanks and for the large ones Model SVRFS-4000 & for Burial Vaults use Model VSP-510.

HOW & WHERE TO MOUNT THE VIBRATORS

QUESTION: Why can't I mount the vibrator to the skin of the form?

ANSWER: When you put a vibrator directly on the skin of the form, you create several problems.

1. You create an "oil canning effect." The movement of the skin actually draws air in, making the product full of air holes.

2. The vibration energy is not distributed over form side but is concentrated just around the vibrator. This concentrated force will create fatigue cracks in the form skin and the vibration may actually tear out a piece of the form around the vibrator The concentrated vibration energy also may cause segregation where the vibrator is mounted.

The correct way to mount the vibrators is on a stiffener to distribute the vibration energy or force over a larger surface as well as to prevent the “oil canning effect,” reducing the problem of fatigue cracks.


The reason #2 preferred mount is better because:

1. An added stiffener is usually only tack welded to the skin of the form and if welds are not reinforced fatigue cracks may develop.

2. If you secure a channel iron over 3 stiffeners as the preferred #2 mount, you are using stiffeners that are a rigid part of the form and the energy forces of the vibrator are used much more effectively.