© 2019 by Sigma DG Corporation.

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Sigma Fiberglass Ties

Safe Working Loads

2:1 safety factor

400 Series Single Nut                      3,000 lbs

400 Series Single Nut + Jamb         4,000 lbs

400 Series Double Nut                    5,000 lbs

400M Series (Modular) Single Nut   1,500 lbs

400M Series Single + Jamb              2,000 lbs

400M Series Double Nut                  3,000 lbs

700 Series Single Nut                       8,000 lbs

700 Series Double Nut                    16,000 lbs

1000 Series Single Plastic Nut          10,000 lbs

1000 Series Single Steel Nut            15,000 lbs

1000 Series Double Steel Nut          30,000 lbs

This estimating tool is to help determine product quantities. All final form work design should be signed off by the appropriate project engineer. The 400 Series form pressure in this calculator is based off ACI 347-14 equation 2.2.
The concrete volume calculator is to give a good estimate of how much concrete is needed and how fast it will fill a particular form based on user inputs. This will help determine vertical pour rates and how much pressure will eventually be exerted on the forms and ties.

Pressure Tables

To calculate form tie pressure, refer to the Form Pressure Table to the left.

Once the lateral pressure is determined considering rate of pour and temperature, round up to the nearest 100 pounds. Then, look at the bottom table in the blue column, this is your lateral form pressure determined from the top table. Cross reference the lateral pressure you determined from the top table with the desired tie spacing to find the anticipated tie pressure.

Please note that maximum PSF will not exceed the values in the yellow column which is weight of concrete per cubic foot (150 lbs) multiplied by the height of the plastic concrete.

Concrete is assumed to be a Type 1 cement without retarders and normal internal vibration and weighs 150 pounds per cubic foot.

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