Install Pit in NBN project

7/23/2019 Install Pit in NBN project

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For Official Use Only

Install Pit BRGNBN-CON-GDE-1656 | Rev 1.0 | 02 APR 15

Owner: Lance Parkes - Standards & Field Practices, Construction Standards & Processes

© NBN Co Limited 2015 | ACN 136 533 741 Page 1 of 11This document is provided for information purposes only and its contents are subject to change. NBN Co does not make any representations orwarranties as to the currency, accuracy or completeness of the information contained herein or that the processes and information outlined complywith all (or any) laws, codes of practice or standards. The recipient must make its own inquiries to satisfy itself as to the currency, accuracy andcompleteness of this document and the information contained in it. The contents of this document should not be relied upon by any Delivery Partneror any other person as a substitute for knowledge, experience, care, skill, or any other contractual or legal obligation. Not for general distribution.


This build reference guide (BRG) provides a guide in relation to pit installation. It references rules and guidelines from the following

documents:

NBN-COO-P&D-490: Type 2.0 Architecture: Passive Network Design Rules

NBN-TE-CTO-483: NBN Co Conduit and Pit Network Deployment: Brownfields

NBN-TE-CTO-194: New Developments: Deployment of the NBN Co Conduit and Pit Network – Guidelines for Developers.

Note:

Before and during this task ensure all applicable safety requirements are followed.

Do not deviate from the specifications provided, without prior approval from NBN.

Do not commence digging without first checking for other assets via the Dial Before You

Dig website or 1100 phone number.




NBN-CON-GDE-1656 | Rev 1.0 Install Pit BRG

NBN Co Limited | Uncontrolled when printed Page 2 of 11

Pit Location

Ensure a minimum separation of 1m fromall poles excluding transformer poles.

Ensure a minimum separation of 15m from

any pad mounted transformer or pole with a

transformer installed on it (EPR zone).

Ensure a minimum separation of 1m from

back of kerb where practical.

Ensure a minimum separation of 3m fromthe property boundary for all pits installed

on corners.

Ensure pit is aligned with the kerb in

communications alignment.

Do not install pit on an angle (as in photo).






Excavation of Site

Excavate site to required size and depth.

Excavate site larger than the pit to accommodate correct

compaction methods – typically a minimum distance of

150mm beyond the outer wall of the pit is sufficient.

Ensure that the excavated site allows for conduit to be

installed at the correct depth.






Pit Foundation

Ensure a foundation of sand, refinedcrushed rock, or stabilized sand is used to

a depth of 100mm.

Make the required alterations to the pit

foundation in order to level out pit with

ground surface level or pavement.






Conduit Entries to Pits

Ensure the conduit entries are correct. Ensure the correct size hole saw is used for conduit entries to allow the bushes

to be a tight fit into the pit.

Ensure conduits are cut square and flush to interior wall of the pit with conduits

inserted fully into the bush and PVC glued.

Ensure entry/exit points at opposite ends of the pit are aligned in order for cabling

to be hauled through easily.

Do not extend conduit too far into pit, at an angle or without a bush.

Note: the conduit example in the photo is now a difficult rectification as there is a

good chance the cable will be damaged and split bushes will be required.






Do not misalign conduit entry and exit points as this could cause

hauling issues.

Ensure the top of the entry for the conduit is level with, or below, the

minimum depth of cover required, i.e. 450mm for all street conduits.

Ensure the bottom of the entry for the conduit is 50mm above the inside

base of the pit to avoid infiltration of silt into the pit






Back Filling

Contour the backfill material into the ribs in order to provide maximumstrength and to maintain the pits structural integrity.

Use sand, refined crushed rock or stabilized sand as backfill material.

Do not allow the walls of the pit to warp during the backfilling process.

Ensure a non-mechanical hand operated compactor is used to hard-pack

backfill.

Compact in layers 150mm in depth or under.

Use this process to fill the whole excavation with allowance for final

surface reinstatement.

P6, P8 and P9 pits came with two PVC cable bearers fitted into the

interior of the pit, these bearers must be installed before back filling

commences along with the gaskets.






Ensure in grassed areas, backfill material stops within 50mm

of the finished surface level and that top soil or turf is installed

to the finished surface level (visible clumps of dirt, clay androcks will not be acceptable).

Alternatively allow for laying of pavement or temporary hard

surface reinstatement.

Check temporary hard surfaces reinstatement for trip

hazards.

Ensure all spoil and rubbish is removed at completion of pit

installation.

Incorrect backfilling methods will result soil subsidence

around pits post installation causing safety issues

All new NBN pits require NBN branded lids any new pits with

Telstra infrastructure inside require Telstra lids






Where possible, the installation of a

pit in both pathway and verge orgarden bed simultaneously should

be avoided.






Labelling

Label the NBN breakout conduit duringinstallation.

Label any breakout conduit that link Telstra

pits to Telstra pits.

Label and seal any breakout conduit that link

Telstra pits to NBN pits.

Do not wait until PC to label the conduit as

returning later will take extra time and may beforgotten.






Update Documentation during

Construction Update the Construction Plan with red lines to reflect ‘as

built’.

Prepare dilapidation reports with before and after

photographs and addresses during construction.

Do not wait until PC to update documentation as updating

documentation during PC will take more time

This is not intended to be an exhaustive list of instructions – please see your site supervisor for more detailed information.

Documents

Install Pit in NBN project