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The weight of a rail per length is an important factor in determining rail strength and hence axleloads and speeds. Weights are measured in pounds per yard (imperial units are used in Canada, the United Kingdom and United States) or kilograms per metre (metric units are used in Australia and mainland Europe). 1 kg/m = 2.0159 lb/yd.
1⁄12 ft 3. The board foot or board-foot is a unit of measurement for the volume of lumber in the United States and Canada. It equals the volume of a board that is one-foot (305 mm) in length, one-foot (305 mm) in width, and one-inch (25.4 mm) in thickness. Board foot can be abbreviated as FBM (for "foot, board measure"), BDFT, or BF.
In North America and the United Kingdom, rail is graded in pounds per yard (usually shown as pound or lb), so 130-pound rail would weigh 130 lb/yd (64 kg/m). The usual range is 115 to 141 lb/yd (57 to 70 kg/m). In Europe, rail is graded in kilograms per metre and the usual range is 40 to 60 kg/m (81 to 121 lb/yd).
The crosstie spacing of mainline railroad is approximately 19 to 19.5 inches (48 to 50 cm) for wood ties or 24 inches (61 cm) for concrete ties. The number of ties is 3,250 wooden crossties per mile (2,019 ties/km, or 40 ties per 65 feet) for wood ties or 2,640 ties per mile for concrete ties. [3] [42] [43]
The wood moisture content is above 25% on a dry-weight basis; The environment is sufficiently warm; Oxygen (O 2) is present; Wood with less than 25% moisture (dry weight basis) can remain free of decay for centuries. Similarly, wood submerged in water may not be attacked by fungi if the amount of oxygen is inadequate. Fungi lumber/timber ...
Utilizing a large number of identical steel members rather that unique size or shape members also reduces cost. [10] Strength/weight ratio – Construction materials are commonly categorized by their strength to weight ratio—or specific strength, which is the strength of a material divided by its density. These ratios indicate how useful the ...
Framing side by side units. The erection of a wooden frame in Sabah, Malaysia. Framing, in construction, is the fitting together of pieces to give a structure support and shape. [ 1] Framing materials are usually wood, engineered wood, or structural steel. The alternative to framed construction is generally called mass wall construction, where ...
Slotted angle. Slotted angle (also sometimes referred to as slotted angle iron) is a system of reusable metal strips used to construct shelving, frames, work benches, equipment stands and other structures. The name derives, first, from the use of elongated slots punched into the metal at uniform intervals to enable assembly of structures fixed ...
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