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  2. Hydraform International - Wikipedia

    en.wikipedia.org/wiki/Hydraform_International

    Hydraform International Pty Ltd. is a manufacturer of brick and blockmaking machines. It was founded in Johannesburg, South Africa. [1] The company specialises in brick and blockmaking machines and accessories that enable the development of a stabilised soil cement block or a compressed earth block (CEB).

  3. Nigerian Building and Road Research Institute - Wikipedia

    en.wikipedia.org/wiki/Nigerian_Building_and_Road...

    The institute engages the Government of Nigeria on various policies that regulate and improve the quality of buildings in Nigeria. [9] In May 2011 the Federal Government of Nigeria announced a Material Testing Laboratory to be set up, which would provide a facility for the testing of building material before use. [ 9 ]

  4. Interlock (engineering) - Wikipedia

    en.wikipedia.org/wiki/Interlock_(engineering)

    Trapped key interlock switchgear door. An interlock is a feature that makes the state of two mechanisms or functions mutually dependent. It may consist of any electrical or mechanical devices, or systems. In most applications, an interlock is used to help prevent any damage to the machine or to the operator handling the machine.

  5. Compressed earth block - Wikipedia

    en.wikipedia.org/wiki/Compressed_earth_block

    A compressed earth block (CEB), also known as a pressed earth block or a compressed soil block, is a building material made primarily from an appropriate mix of fairly dry inorganic subsoil, non-expansive clay, sand, and aggregate. Forming compressed earth blocks requires dampening, mechanically pressing at high pressure, and then drying the ...

  6. Interlocking - Wikipedia

    en.wikipedia.org/wiki/Interlocking

    An interlocking system is designed so that it is impossible to display a signal to proceed unless the route to be used is proven safe. Interlocking is a safety measure designed to prevent signals and points/switches from being changed in an improper sequence. For example, interlocking would prevent a signal from being changed to indicate a ...

  7. Wave-dissipating concrete block - Wikipedia

    en.wikipedia.org/.../Wave-dissipating_concrete_block

    Tetrapods used to protect a seawall Large interlocked Xblocs (8.0 m 3 or 280 cu ft) in a trial placement. A wave-dissipating concrete block is a naturally or manually interlocking concrete structure designed and employed to minimize the effects of wave action upon shores and shoreline structures, such as quays and jetties.

  8. Trapped-key interlocking - Wikipedia

    en.wikipedia.org/wiki/Trapped-key_interlocking

    A key exchange block may only hold and release keys and may not have a bolt to interlock process equipment, or may be part of the interlock of a particular machine or device. This is a transfer block, part of a trapped-key interlock system. It does not have a bolt to stop operation of a device, but holds and releases other keys. Manufacturers ...

  9. Portsmouth Block Mills - Wikipedia

    en.wikipedia.org/wiki/Portsmouth_Block_Mills

    There were three series of block-making machines, each designed to make a range of block sizes. They were laid out to allow a production line, so each stage of the work progressed to the next in a natural flow. The yard between the two wood mill buildings was walled-off and roofed to form a new workshop to house the block-making machines. [3]

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