Masonry Bridge

Masonry Bridge

 

a bridge whose main load-bearing structures are made of natural stone, brick, or concrete blocks. Such a bridge is always arched, with massive supports. The main load-bearing element of a masonry bridge is the arch, over which is built the spandrel, which in turn supports the bridge roadway. The spandrel is made from a gravel or crushed stone backing held in by lateral (side) walls made of concrete masonry or stonework or in the form of an open structure of small arches resting on crosswalk.

The advantages of a masonry bridge are its architectural at-tractiveness and its durability. Masonry bridges are known thathave been in use for more than 1,000 years. The basic shortcom-ings that limit the use of masonry bridges are their complexityand labor-intensiveness of construction. A variation of a ma-sonry bridge is the concrete bridge, which has an arch made ofcast concrete.

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The works are principally the demolition of the existing stone masonry bridge parapets and replacement with new parapets of cast concrete block construction.
Other work under the Historical Commission's purview includes the removal and replacement of metal doors in some of the buildings, repairing and repointing the brick exterior, removing the wood cargo bay, and repairing the steel and masonry bridge that connects two buildings in the complex.
The amazing fact is that this masonry bridge was built without any contemporary engineering and was simply intuitively engineered after an early Roman bridge.
Further discussion of masonry bridge chronology must consider the need for viable yearround communication routes and, in the case of large examples such as the 140m long Spean Toeup, the availability of manpower and resources.
The river at Newcastle was similarly improved after 1876 when the old masonry bridge was removed and replaced with the Swing Bridge.
Sue also showed me a new masonry bridge being built by the Snowdonia Upland Path Partnership in Nant y Gadair; the project is now waiting for better weather so that a helicopter can deliver the remaining slate slabs.
Developments will take place in three phases over the next five years and will include the restoration of the former engine house and masonry bridge, which are both listed.
The 17th century masonry bridge, a scheduled ancient monument, crosses the Alyn river between Hope and Caergwrle.
deconstruction neat of a masonry bridge and partial reconstruction of his ark.
And forming a key part of the overall project will be the North Dock's historic Engine House and masonry bridge, which are listed by Cadw as buildings of historic or architectural interest.