JENNMAR Overcast Systems are designed to be modular reusable structures that are used in underground high-pressure situations to insure intake air is not contaminated with return air. Overcasts can be designed to be driven over with equipment such as man trips, continuous miners, bolters, and/or haulage equipment. Utilization of wide flange beams and roll-formed V-Deck lagging allows for an air-tight seal. Reusable lightweight materials are well suited for underground construction.
Advantages
• Lightweight and durable
• Easily transported and assembled
• Strong enough to resist rib rolls and minor roof material
JENNMAR Overcast Systems consist of the following components:
• Cross-member, W6 × 15
• Leg member, W4 × 13
• Tie rods & spacer tubes
• Bolt-together assembly
• V-Deck lagging with foam
• Channel runner
• Man doors
• Overcasts can be designed and built with stairways, ladders, and ramps complete with handrails to allow for travel over the top of the overcast. Access ways are constructed with 3 points of contact in mind.
Mastercast
• Rapid assembly, as few as six major pieces
• All sizes available in 12" increments
• Reusable and galvanized panels
• Chanel ends for wingwalls
• Light and heavy-duty versions
• Ships complete with all tools
Traditional Overcasts
• Strong — made with wide flange beam
• All steel — no aluminum
• Quick erection — 2–4 hours
• Most sizes
• Reuseable