Concrete Bricks Salisbury MD

Coal mines in Salisbury 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."

Rock Bottom Paving Inc
(410) 677-3630
128 E Church St
Salisbury, MD
 
Hp Paving Inc
(410) 546-5402
2214 W Zion Rd
Salisbury, MD
 
Harrison N R
(410) 742-0359
7530 Stanton Ave
Salisbury, MD
 
Dyer Environmental Services
(443) 235-7221
6464 Riawakin Dr
Salisbury, MD
 
Bayside Seal Coating
(410) 341-0953
29918 Winchester Ct
Salisbury, MD
 
Chesapeake Maintenance
(410) 548-1155
705 Beauchamp St
Salisbury, MD
 
Scott'S Striping
(410) 543-9364
7868 Parsonsburg Rd
Salisbury, MD
 
Donna White Dba B&D
(410) 543-0747
2425 Paleo Ln
Salisbury, MD
 
H Parker Paving
(410) 677-4887
PO Box 2932
Salisbury, MD
 
Parsons Professional Grounds Maintenance
(410) 548-1982
4686 Snow Hill Rd
Salisbury, 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