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A lightweight box crib Hardwood railway sleepers used as a box crib, North Australian Railway, 1975 Bailey Island Bridge, Harpswell, Maine. The only granite cribstone bridge in the world. A box crib or cribbing is a temporary wooden structure used to support heavy objects during construction, relocation, vehicle extrication and urban search and ...
A shim is a thin and often tapered or wedged piece of material, used to fill small gaps or spaces between objects. [1] Shims are typically used in order to support, adjust for better fit, or provide a level surface. Shims may also be used as spacers to fill gaps between parts subject to wear.
Falsework parallel truss bridges temporarily supporting deck segment box structures Overpass under construction over Interstate 5 in Burbank, California, in July 2021 [4] [5] Sixth Street Viaduct Falsework - Bent 11 Jump Span. Shown in the background is a concrete Y-Arm.
Using Plug and Feathers Video of a stone block being split with plug and feathers; Drilling and splitting Video explaining the process from drilling, placing supports and use of plug and feathers; with timing; Different methods for splitting stone using hand tools Includes photographs of the tools and the different type of quarry marks left by ...
Shoring is used on board when damage has been caused to a vessel's integrity, and to hold leak-stopping devices in place to reduce or stop incoming water. Generally consists of timber 100 mm x 100 mm and used in conjunction with wedges, to further jam shoring in place, pad pieces to spread the load and dogs to hold it together. Also used on ...
Mortise and tenon joints are strong and stable joints that can be used in many projects. They connect by either gluing or friction-fitting into place. The mortise and tenon joint also gives an attractive look. One drawback to this joint is the difficulty in making it because of the precise measuring and tight cutting required.
Blocking (dwang, nog, noggin, and nogging) is the use of short pieces of dimensional lumber in wood framed construction to brace longer members or to provide grounds for fixings. Uses [ edit ]
The mechanical advantage or MA of a wedge can be calculated by dividing the height of the wedge by the wedge's width: [1] M A = L e n g t h W i d t h {\displaystyle {\rm {MA={Length \over Width}}}} The more acute , or narrow, the angle of a wedge, the greater the ratio of the length of its slope to its width, and thus the more mechanical ...