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Steeplejacks erect ladders on church spires, industrial chimneys, cooling towers, bell towers, clock towers, or any other high structure.In the UK, steeplejacks now use a belay rope fall-arrest system (similar to the method used by rock climbers) attached to the ladders as they are erected to eliminate solo climbing and greatly reduce the risk of falls from height.
Concrete landscape curbing (or concrete landscape bordering) is an alternative to plastic or metal landscape edging. Landscape curbing is made with various elements of concrete depending on the climate where it is being used. [1] Concrete landscape curbing has become more popular over the last decade with suppliers offering a variety of styling ...
These rope bridges must be renewed periodically owing to the limited lifetime of the materials, and rope components are made by families as contributions to a community endeavor. Simple suspension bridges, for use by pedestrians and livestock, are still constructed, based on the ancient Inca rope bridge but using wire rope and sometimes steel ...
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Sidewalks are a common form of hardscaping. Hardscape is hard landscape materials in the built environment structures that are incorporated into a landscape. [1] This can include paved areas, driveways, retaining walls, sleeper walls, stairs, walkways, and any other landscaping made up of hard wearing materials such as wood, stone, and concrete, as opposed to softscape, the horticultural ...
The Michigan-California Lumber Company was an early 20th-century Ponderosa and Sugar pine logging operation in the Sierra Nevada. It is best remembered for the Shay locomotives used to move logs to the sawmill .
Crosshole sonic logging (CSL) is a method to determine the structural integrity of drilled shafts and other concrete piles. The CSL method is considered to be more accurate than sonic echo testing in the determination of structural soundness of concrete within the drilled shaft inside of the rebar cage. This method provides little indication of ...
A concrete curved-chord through girder bridge, sometimes known as a camelback bridge, [2] [i] is a type of concrete bridge most common in the U.S. state of Michigan and the Canadian province of Ontario. [1] C.V. Dewart, the first professional bridge engineer of the Michigan State Highway Department, designed the type. [3]