Unless otherwise detailed on the Drawings the provisions relating to in-situ concrete drainage structures shall apply to drainage structures of brick construction where such method is a specified alternative. Bricks be well wetted before use and every course shall be set in a full Pointing bed of cement mortar with all joints solidly filled. Walls shall be properly bonded, fair faced and flush pointed internally. No bats or broken bricks will be allowed, except where necessary for Mortar closers. Mortar joints shall not be thicker than 10mm, but some variation is Thickness permissible where brickwork is used to adjust the height and slope of catchpit and gully frames. 405.34.04 PRECAST CONCRETE LINERS Unless otherwise detailed on the Drawings the provisions relating to in-situ concrete drainage structures shall apply to those of precast concrete liner construction wherever relevant. Holes of sufficient size to accommodate entry and exit pipes shall be cut or Liner Holes punched out in accordance with the manufactures published requirements without cracking the liner or causing unnecessary damage. The hole to accommodate the pipe shall be no greater than the pipe diameter plus 100mm. Cement mortar, or an approved Epoxy mortar shall be used in sealing around holes formed in structures to accommodate entry and exit conduits. 405.35 STEP IRONS Where the depth of manholes and gullies are greater than one metre, step irons shall be provided at 300mm intervals in height unless otherwise shown on the Drawings. 405.36 REMOVAL OF EXISTING DRAINAGE STRUCTURES Where detailed on the Drawings, redundant drainage structures located Removal under roadways shall be removed and disposed of by the Contractor to the Contractor’s disposal site, or an authorised waste disposal site or a site approved by the relevant Local Government Authority. Voids left from the removal of a drainage structure, not intended to be Voids replaced shall be backfilled and compacted with embankment quality material in accordance with Specification 302 EARTHWORKS or Pavement Material in accordance with Specification 501 PAVEMENTS, as required by this Specification. 405.37 DAMAGE TO EXISTING STRUCTURES If during construction of the Works, the Contractor causes damage to any drainage structure that is not to be removed or disturbed, the Contractor shall repair the damage or replace the damaged structure to the requirements of this Specification at no extra cost to the Principal. 405.38 ADJUSTMENTS OF EXISTING GULLY GRATES AND MANHOLE COVERS
Unless otherwise detailed on the Drawings the provisions relating to in-situ concrete drainage structures shall apply to drainage structures of brick construction where such method is a specified alternative. Bricks be well wetted before use and every course shall be set in a full bed of cement mortar with all joints solidly filled. Walls shall be properly bonded, fair faced and flush pointed internally. Pointing No bats or broken bricks will be allowed, except where necessary for closers. Mortar joints shall not be thicker than 10mm, but some variation is permissible where brickwork is used to adjust the height and slope of catchpit and gully frames. Mortar Thickness 405.34.04 PRECAST CONCRETE LINERS Unless otherwise detailed on the Drawings the provisions relating to in-situ concrete drainage structures shall apply to those of precast concrete liner construction wherever relevant. Holes of sufficient size to accommodate entry and exit pipes shall be cut or punched out in accordance with the manufactures published requirements without cracking the liner or causing unnecessary damage. The hole to accommodate the pipe shall be no greater than the pipe diameter plus 100mm. Cement mortar, or an approved Epoxy mortar shall be used in sealing around holes formed in structures to accommodate entry and exit conduits. Liner Holes 405.35 STEP IRONS Where the depth of manholes and gullies are greater than one metre, step irons shall be provided at 300mm intervals in height unless otherwise shown on the Drawings. 405.36 REMOVAL OF EXISTING DRAINAGE STRUCTURES Where detailed on the Drawings, redundant drainage structures located under roadways shall be removed and disposed of by the Contractor to the Contractor’s disposal site, or an authorised waste disposal site or a site approved by the relevant Local Government Authority. Removal Voids left from the removal of a drainage structure, not intended to be replaced shall be backfilled and compacted with embankment quality material in accordance with Specification 302 EARTHWORKS or Pavement Material in accordance with Specification 501 PAVEMENTS, as required by this Specification. Voids 405.37 DAMAGE TO EXISTING STRUCTURES If during construction of the Works, the Contractor causes damage to any drainage structure that is not to be removed or disturbed, the Contractor shall repair the damage or replace the damaged structure to the requirements of this Specification at no extra cost to the Principal. 405.38 ADJUSTMENTS OF EXISTING GULLY GRATES AND MANHOLE COVERS
Specification%20405%20Drainage%20Structures%2001%20May%202017.RCN-D17^23334982.DOCX