Hamilton Form, Ltd.
7009 Midway Road
Fort Worth, TX 76118

Phone: 817 590-2111
Fax: 817 595-1110
sales@hamiltonform.com

PCI NPCA CPCI

Frequently Asked Questions

Do forms require maintenance?

Periodic routine preventive maintenance and inspection of your steel forms is essential for long life and continued performance. The following checklist is a set of guidelines you can use to supplement your specific maintenance and safety programs.

  1. First, determine that the form was initially installed properly by reviewing the installation procedures on the form drawings. Frequently a form that is not performing as expected is the result of improper installation.
  2. All forms must be installed level and straight. Has the form been shimmed as required? Are the shims still in place? Was the form partially prestressed before the longitudinal field joint connections were made? Make adjustments as needed.
  3. In general all forms must be supported and clipped at least at every 5' on centers.on 5' centers. The anchor clips must allow the form to move longitudinally, but at the same time must hold the form in line and also resist uplift forces where necessary. These connections must be kept clean and free of any concrete build-up. This is very important, so the form will be able to "breath."
  4. All long-line forms should be anchored and fixed at the center of the bed to allow for expansion and contraction in both directions.
  5. Avoid welding on a form because it could result in distortion of the skin surface.
  6. Most forms are designed to withstand properly applied external vibration. Periodically inspect vibrator mounts for any cracked welds. Never vibrate an empty form.
  7. Use of a self-stressing form to withstand prestressing forces that exceed the allowable specified capacity can result in destruction of the form and possible injury to personnel. Always refer to the form drawing to verify that the stressing capacity is not being exceeded.
  8. Always make sure jacking plates bear evenly on the end of the form skin and stiffeners. Never add new holes or enlarge existing holes in a jacking plate that will increase the stressin capacity without first checking with the engineering department at Hamilton Form Company.
  9. Keep the underside of the form clean and check periodically for excessive corrosion of the understructure. Before any corrosion becomes too severe, the form should be taken up, the affected areas sand blasted, and repainted.
  10. Keep all casting surfaces clean and free of any concrete build-up. Remove debris with a wire brush or by wiping. Do not let standing water collect on or in the form.
  11. Never sand blast or use a hard disk grinder on the skin surface. Any blasting should be done with walnut shells, corn cobs or similar soft material. Avoid removing the mill scale. It is the natural protective coating on the steel plate.
  12. On flat casting tables with gravity-type jacking abutments, periodically inspect the anchor bolts and formed channel clips to insure the abutments and casting table are free to move longitudinally.
  13. When a form is not in use for an extended period of time a corrosion preventive compound should be applied to all casting surfaces.

For specific questions about form maintenance, call our engineering department at (817) 590-2111 or e-mail engineering@hamiltonform.com