Concrete Bricks Annapolis MD

Coal mines in Annapolis are a hidden market for concrete block, used to build ventilation walls. Concrete block walls direct the flow of air, gases and dust. A typical underground coal mine may use more than 100,000 concrete blocks for these walls, called "ventilation stoppings" or "brattish walls."

A.C. Paving
(410) 923-6100
717 Sonne Dr
Annapolis, MD
 
Architectural Hardscapes Inc
(410) 268-5402
141 Gibralter Ave
Annapolis, MD
 
Delta Paving Co
(866) 842-0186
1009 Bay Ridge Ave
Annapolis, MD
 
US Paver Contracting, LLC
(443) 506-7444
1290 Bay Dale Dr. #308
Arnold, MD
 
Cooper Paving
(410) 263-0229
333 Revell Hwy
Annapolis, MD
 
Olmo Bros. Landscaping
(410) 266-8700
1704 Old Generals Hwy
Annapolis, MD
 
Citgo Asphalt Refining Company
(410) 757-9349
2012 Ferry Farms Rd
Annapolis, MD
 
International Masonry Center
(410) 263-5596
Prince George & East Sts
Annapolis, MD
 
David Fuller Construction & Maintence
(410) 268-5355
1018 Cedar Ridge Ct
Annapolis, MD
 
Patuxent Asphalt LLC Administrative Office
(410) 793-3924
2124 Priest Bridge Dr
Crofton, MD
 

Concrete Bricks

Provided By:

Source: MASONRY CONSTRUCTION MAGAZINE
Publication date: May 1, 2008

By Carolyn Schierhorn

Abstract:

Coal mines are a hidden market for concrete block, used to build ventilation walls. Concrete block walls direct the flow of air, gases and dust. A typical underground coal mine may use more than 100,000 concrete blocks for these walls, called "ventilation stoppings" or "brattish walls." Block is also the preferred material for mine seals, which close off abandoned areas. The natural fire resistance of concrete masonry makes it ideal for use in mines, where fire poses an even greater hazard than it does above ground. The high strength and durability of block appeal to mining engineers, who must consider roof cave-ins and explosions in their calculations.

Ventilation Stoppings
The mine workers have to get as much air to the working face as possible and remove methane and coal dust from the area. To do this, mine workers build ventilation stoppings. By preventing unwanted flow in these passages, the walls direct the flow of intake air to the working face and return air, gases, and dust to the outside.

Seals
1.After they've finished mining a section of the mine, workers have to seal that section off with concrete block. The Mine Safety and Health Administration (MSHA) requires that each seal be:

Constructed of solid concrete blocks of at least 6x8x16 inches, laid with mortar between the joints.

2.Hitched (recessed) into the solid sides of the opening to a depth of at least 4 inches and hitched at least 4 inches into the floor

3.At least 16 inches thick.


Concrete masonry remains the material of choice in ventilation stoppings and seals, as well as a popular material for roof supports.

Click here to read full article from Masonry Construction