Installing Pipe Cartridge Method Pit to Pit

In New Zealand, Static Hydraulic Pipe Bursting ‘Cartridge Method - Pit to Pit’ (CMPTP), installing segmented Restrain PVC-U Sewer Pipe has become popular, with successful installations completed in many New Zealand cities. 

Portable, Static Hydraulic Pipe Bursting (ST-HY-PB) combined with the use of Restrain; installed using the CMPTP methodology has allowed contractors to renew sewers at a pull-rate as quick as 1m per minute. Many contractors have invested in portable ST-HY-PB rigs. Approximately 30 operate in Christchurch City alone where approximately 2000 Km’s of sewer laterals were damaged during more than 12,000 seismic events. 

A small low impact work site footprint allows the community to go about their normal day to day business with limited disruption. This technique is significantly faster and has lower overall construction cost, when compared to traditional open cut methods. 

Contractors that have installed pipes using traditional open cut methods have recognized that ST-HY-PB and segmented PVC pipe systems can assist them to increase their daily production by up to 400%. The new sewer pipe is pulled into the host pipe and connected using traditional PVC Drain Waste & Vent fittings. 

This paper will introduce the CMPTP methodology and provide case studies of installations completed in Hastings, Whakatane, Auckland, Wainuiomata, Masterton and Christchurch City.