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 34714 equation 2.2. The 700 / 1000 Series Calculator is based off ACI 34714 equation 2.3.
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 34714 equation 2.2. The 700 / 1000 Series Calculator is based off ACI 34714 equation 2.3.
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 34714 equation 2.2. The 700 / 1000 Series Calculator is based off ACI 34714 equation 2.3.
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 34714 equation 2.2. The 700 / 1000 Series Calculator is based off ACI 34714 equation 2.3.
FIBERGLASS BOLTS
Sigma DG Corporation has become known as the fiberglass rock bolt supplier of choice for North American mining companies of all types: coal, gold, moly, copper, potash, etc. We have many different diameters and lengths to serve your needs. We are the ONLY manufacturer that sells DIRECT to mines saving them thousands of dollars per year in costs. If you want to work with people who KNOW and UNDERSTAND fiberglass (as opposed to it being just another SKU), you have come to the right place. Combined we have over 120 YEARS of fiberglass experience and often can solve your issues quickly and cost effectively.
Using Sigma fiberglass bolts in situations where subsequent excavation will take place has long been a standard practice. The low shear strength and high tensile capacity (as compared to mild steel rock bolts) of the Sigma fiberglass bolts make it the ideal material for this application. The use of our bolts decreases machine down time because it is easily cutable and won't damage valuable mining equipment.
Here are some highlights of the benefits of switching to fiberglass bolts in rib support where subsequent excavation will take place:
Efficiency Items:

Less down time due to torn belts

Less Prep plant magnet maintenance (empty 2x and 1x haul out per day)

Eliminates Prep plant plugged chutes

Less labor expense from cutting steel bolts from the cutter head

Saved cutter jack hoses

Less damage to conveyor and Shuttle car conveyor chains
Safety Items:

Eliminates sparking

Eliminates belt rip potential

Reduction of Hot Work Permits  cutting/torching bolts from feeder pick breaker

Eliminates using torches under the cars and miner to remove hung bolts

No hang ups in belt discharge

No bolt retrieval by hand from CM or SC
Our standard rock bolt come in either polyester or vinylester resins and diameters of:

20mm Right Hand Thread

22mm Right Hand Thread

25mm Right and Left Hand Thread

32mm Left Hand Thread

32/12mm Hollow Left Hand Thread (20' length limit)