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  2. Rebar spacer - Wikipedia

    en.wikipedia.org/wiki/Rebar_spacer

    A concrete spacer with a plastic clip in use Concrete spacers in a precast element Diaphragm wall block on rebar for a Diaphragm wall. A rebar spacer is a short, rod-like device used to secure reinforcing steel bars, or rebar, within cast assemblies for reinforced concrete structures. The rebar spacers are fixed before the concrete is poured ...

  3. Expansion joint - Wikipedia

    en.wikipedia.org/wiki/Expansion_joint

    During installation, prevent any damage to the bellows by carefully following the instructions furnished by the manufacturer. [18] After installation, carefully inspect the entire piping system to see if any damage occurred during installation, if the expansion joint is in the proper location, and if the expansion joint flow direction and ...

  4. Jack post - Wikipedia

    en.wikipedia.org/wiki/Jack_post

    A jack post (telepost, adjustable steel column) is a steel post used in the construction trades for temporary support of ceilings, walls and trenches ().They are designed to be able to mechanically telescope to about twice their shortest length in order to span a wide variety of spaces.

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  6. Derrick - Wikipedia

    en.wikipedia.org/wiki/Derrick

    The bottom of the legs are set in two holes on the ground, spreading them apart. There is a rope to tie the two legs together near the bottom to prevent them from spreading apart further. On the top side, the two legs are connected together by a lashing but with a small spacer block placed between the legs. A sling, which may be made from ropes ...

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  8. NEMA connector - Wikipedia

    en.wikipedia.org/wiki/NEMA_connector

    A North American NEMA-5 receptacle halfway through a corrective re-installation. The fluorescent green spacers, which firmly attach the receptacle to the metallic sub-structure, are made necessary by using 5 ⁄ 8 in (16 mm) drywall instead of 1 ⁄ 2 in (13 mm), or by slightly-misplaced device box housings.

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