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  2. Precast concrete lifting anchor system - Wikipedia

    en.wikipedia.org/wiki/Precast_concrete_lifting...

    Weight: W = V x concrete specific gravity = 2.7 m 3 x 24 kN/m 3 = 64.8 kN; Calculated casting bed suction Suction area: A = w x h = 6.0 m x 3.0 m = 18 m 2; Assuming 1.0 kN/m 2 is applied for oiled steel formwork; Suction force: S = A x 1.0 kN/m 2 = 18 x 1.0 = 18 kN; Applied loads at element lifting (sling angle and lateral tension)

  3. Wire rope - Wikipedia

    en.wikipedia.org/wiki/Wire_rope

    Steel wire rope (right hand lang lay) Wire rope is composed of as few as two solid, metal wires twisted into a helix that forms a composite rope, in a pattern known as laid rope. Larger diameter wire rope consists of multiple strands of such laid rope in a pattern known as cable laid. Manufactured using an industrial machine known as a strander ...

  4. Rigging (material handling) - Wikipedia

    en.wikipedia.org/wiki/Rigging_(material_handling)

    Sheave – Grooved wheel used to support a moving belt, wire or rope; Sheer legs; Sling (rigging) – Rope, webbing, wire or chain used to support a load for lifting; Rope splicing – Semi-permanent joint between two ropes; Tackle – System of two or more pulleys and a rope or cable; Tirfor – Device for pulling cable; Tugger (rigging)

  5. Eurocode 2: Design of concrete structures - Wikipedia

    en.wikipedia.org/wiki/Eurocode_2:_Design_of...

    Logo of Eurocode 2 An example of a concrete structure. In the Eurocode series of European standards (EN) related to construction, Eurocode 2: Design of concrete structures (abbreviated EN 1992 or, informally, EC 2) specifies technical rules for the design of concrete, reinforced concrete and prestressed concrete structures, using the limit state design philosophy.

  6. Block and tackle - Wikipedia

    en.wikipedia.org/wiki/Block_and_tackle

    Typical values are 1.04 for roller bearing sheaves and 1.09 for plain bearing sheaves (with wire rope). [11] The increased force produced by a tackle is offset by both the increased length of rope needed and the friction in the system. In order to raise a block and tackle with a mechanical advantage of 6 a distance of 1 metre, it is necessary ...

  7. Lift slab construction - Wikipedia

    en.wikipedia.org/wiki/Lift_slab_construction

    Lift slab construction (also called the Youtz-Slick Method) is a method of constructing concrete buildings by casting the floor or roof slab on top of the previous slab and then raising (jacking) the slab up with hydraulic jacks. This method of construction allows for a large portion of the work to be completed at ground level, negating the ...

  8. Arching or compressive membrane action in reinforced concrete ...

    en.wikipedia.org/wiki/Arching_or_Compressive...

    The derivation of the maximum arching moment of resistance of laterally restrained concrete bridge deck slabs utilised Rankin's [21] idealised elastic-plastic stress-strain criterion for concrete, valid for concrete cylinder strengths up to at least 70N/mm 2, which he had derived on the basis of Hognestad, Hanson and McHenry's [23] ultimate ...

  9. Simple suspension bridge - Wikipedia

    en.wikipedia.org/wiki/Simple_suspension_bridge

    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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