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  2. Keystone (architecture) - Wikipedia

    en.wikipedia.org/wiki/Keystone_(architecture)

    The keystone (shown in red) of an arch Dropped keystone at Colditz Castle. A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to ...

  3. Retaining wall - Wikipedia

    en.wikipedia.org/wiki/Retaining_wall

    A basement wall is thus one kind of retaining wall; however, the term usually refers to a cantilever retaining wall, which is a freestanding structure without lateral support at its top. [2] These are cantilevered from a footing and rise above the grade on one side to retain a higher level grade on the opposite side.

  4. Mechanically stabilized earth - Wikipedia

    en.wikipedia.org/wiki/Mechanically_stabilized_earth

    The wall face is often of precast, segmental blocks, panels or geocells that can tolerate some differential movement. The walls are infilled with granular soil, with or without reinforcement, while retaining the backfill soil. Reinforced walls utilize horizontal layers typically of geogrids. The reinforced soil mass, along with the facing ...

  5. Ecology block - Wikipedia

    en.wikipedia.org/wiki/Ecology_block

    Ecology block with rebar loop on top for use with heavy equipment. An ecology block, also known as an eco-block or ecoblock, is a type of recycled concrete block used to make retaining walls. Ecology blocks are manufactured using concrete left over from other construction processes.

  6. Corbel arch - Wikipedia

    en.wikipedia.org/wiki/Corbel_arch

    For the sake of comparison, a semicircular arch with wedge-shaped voussoirs maintained by a central keystone ("true arch"). A corbel arch (or corbeled / corbelled arch ) is an arch -like construction method that uses the architectural technique of corbeling to span a space or void in a structure, such as an entranceway in a wall or as the span ...

  7. Tieback (geotechnical) - Wikipedia

    en.wikipedia.org/wiki/Tieback_(geotechnical)

    Typically in the form of a horizontal wire or rod, or a helical anchor, a tieback is commonly used along with other retaining systems (e.g. soldier piles, sheet piles, secant and tangent walls) to provide additional stability to cantilevered retaining walls. [1]