Arches BEBO_Mandalong mine.indd

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					                                 Project Profile
                                 Mandalong Mine access decline
     Project                     built with BEBO™ Arches
     Details:                    A new access decline has been constructed with Humes two-piece BEBO™ Arches at
                                 Centennial Mandalong Pty Ltd’s new Mandalong Coal Mine in the New South Wales
                                 Hunter Valley.

                                 The precast concrete arches were installed by John Holland as part of extensions to
                                 underground mining operations at Mandalong Mine.

Location                         The project involves constructing a 1.4 kilometre decline with a 6m wide x 5m high profile
                                 from the surface at Mandalong Mine through sandstone, conglomerate, shale and coal to
Mandalong Mine, NSW              the West Wallarah Seam.

                                 The portal construction forms the initial part of the decline, starting at the surface and
Principal                        extending at a gradient of 1 in 8 until a suitable depth of rock cover is achieved.
Centennial Mandalong
Pty Ltd                          BEBO™ Arches in two halves with a span of 8m and height of 6.1m were used to construct
                                 the 8m wide portal. They were placed side by side to form a ready-made tunnel and were
                                 stabilised with select back-fill.
John Holland                     Precast concrete’s many benefits prompted Centennial Mandalong Pty Ltd to specify the
                                 use of concrete arches for the project according to the company’s Senior Project Engineer,
                                 Ian Middleton.
Mining to commence 2005          “Precast concrete arches have a significantly longer design life and are both fast and cost-
                                 effective to install,” he explains. “By comparison, cast insitu concrete, in our experience,
                                 takes too long to complete and the construction phase is subject to inclement weather.
Product Details
                                 “BEBO™ Arches also offer the additional benefits of minimising the amount of cast insitu
• 56 x two-piece BEBO™           concrete formwork, are corrosion and fire resistant, easy to backfill and compact and able
  Arches                         to withstand significant superimposed loads.”

• 1 x splayed two-piece          Adam Nancarrow, Project Manager with John Holland’s Tunnelling and Underground
  terminating unit               Mining Division, agrees that use of BEBO™ Arches helped meet construction timelines.
• 14 x two-piece units with      “Their ease and speed of installation made it possible to complete this project stage in a
  blockouts for manholes         matter of days and thereby maintain the construction program,” he says.

Product Benefits
• Long design life
• Fast to install
• Less insitu concrete
  formwork – minimises
• Corrosion and fire resistant
• Easy to backfill and
• Withstand significant
  superimposed loads

                                 Access decline constructed with BEBO™ Arches

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Description: Arches BEBO_Mandalong mine.indd