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Acq (alkaline copper quarternary)
| Glossary of Timber Bridge Terminology |
A pressure treatment commonly used by ybc to protect wood against decay and insects. acq contains copper and quat components (fungicides that attack decay organisms) that work together to protect the lumber.
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Components, английский
Комплектующие
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Live load, английский
- A variable load on a structure (e.g. a bridge) such as moving traffic or pedestrians. it is usually expressed in terms of pounds per square foot. standard loading for york timber bridges are 85 lbs./square foot for pedestrian bridges and 100 lbs./square f
- The total variable weight on a structure. it includes the weights of people, furnishings, snow, wind and earthquake.
- Экипаж и пассажиры
- The moving or movable external load on a structure; includes the weight of furnishings of a building, of the people, of equipment, etc., but does not include wind load.
- Динамическая нагрузка
- In drilling, a variable load suspended on the hoist line.
- In mechanics, a load that is variable, as distinguished from a load that is constant. also called dynamic load. lm bit. a nonstandard 1.406-inch set-outside-diameter bit much used in australia and canada as a noncor-ing bit. it is used with a 1.428- to 1.438-inch set-outside-diameter reaming shell and lm rods. when set as a core bit, the inside diameter is such that it cuts a standard ex-size core. lm rod. an australian and canadian letter name for a nonstandard-size, nonstandard-design drill rod having an outside diameter of 1%6 inches. it is used with xrn bits and shells in blasthole-drilling operations.
Culvert, английский
- A pipe or concrete box structure that conveys flow from open channels, swales, or ditches under a roadway, driveway, fill soil, or surface structure. can be made of galvanized corrugated metal, plastic, aluminum or concrete.
- Round, corrugated drain pipe (normally 15" or 18" in diameter) that is installed beneath a driveway and parallel to and near the street.
- A passage below ground level which permits the flow of water; often a large diameter metal or concrete pipe.
- Small bridge or pipe carrying a stream under a railway or road
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