Concrete Bricks Hagerstown MD

Coal mines in Hagerstown 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."

Clipp Richard
(301) 733-1306
12207 Brookfield Ave
Hagerstown, MD
 
Jeter Paving Company Inc
(301) 797-6941
1445 Oak Ridge Place
Hagerstown, MD
 
Hetzer C William Inc Dgn Engineers
(301) 733-7300
9401 Sharpsburg Pike
Hagerstown, MD
 
Creative Paving & Sealing Inc
(301) 790-3455
846 Summit Ave
Hagerstown, MD
 
Hetzer C William Inc Asphalt Plant
(301) 416-7631
10104 Mapleville Rd
Hagerstown, MD
 
Line A Lot Striping Sealcoating
(301) 797-1831
12833 Point Salem Rd
Hagerstown, MD
 
Craig Paving Inc
(301) 739-9814
118 Hump Rd
Hagerstown, MD
 
Craig Paving Inc
(240) 420-0522
1000 Dual Hwy
Hagerstown, MD
 
Asphalt Maintenance
(301) 745-6358
237 Winter St
Hagerstown, MD
 
Bill'S Blacktop Sealing Repair
(301) 739-3556
402 S Mulberry St
Hagerstown, 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