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  2. Jack arch - Wikipedia

    en.wikipedia.org/wiki/Jack_arch

    A jack arch, and a jack arch with a relieving arch above, as illustrated in the Lexikon der gesamten Technik The Mardin jack arch, view from the crypt underneath. A jack arch is a structural element in masonry construction that provides support at openings in the masonry.

  3. Pipe ramming - Wikipedia

    en.wikipedia.org/wiki/Pipe_ramming

    Pipe ramming (sometimes also called pipe jacking) is a trenchless method for installation of steel pipes and casings. Distances of 30 m (150 feet) or more and over 500 mm (20 inches) in diameter are common, although the method can be used for much longer and larger installations.

  4. Roof and tunnel hacking - Wikipedia

    en.wikipedia.org/wiki/Roof_and_tunnel_hacking

    Roof and tunnel hacking is the unauthorized exploration of roof and utility tunnel spaces. [1] The term carries a strong collegiate connotation, stemming from its use at MIT and at the U.S. Naval Academy , [ citation needed ] where the practice has a long history.

  5. Tunnel - Wikipedia

    en.wikipedia.org/wiki/Tunnel

    In pipe jacking, hydraulic jacks are used to push specially made pipes through the ground behind a TBM or shield. This method is commonly used to create tunnels under existing structures, such as roads or railways. Tunnels constructed by pipe jacking are normally small diameter bores with a maximum size of around 3.2 metres (10 ft).

  6. Tunnel construction - Wikipedia

    en.wikipedia.org/wiki/Tunnel_construction

    In pipe jacking, hydraulic jacks are used to push specially made pipes through the ground behind a TBM or shield. This method is commonly used to create tunnels under existing structures, such as roads or railways. Tunnels constructed by pipe jacking are normally small diameter bores with a maximum size of around 3.2 metres (10 ft).

  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 ...