SECTION IX SLIP LINING PIPELINES

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1 AN SECTION IX SLIP LINING PIPELINES February, 2008

2 TABLE OF CONTENTS SECTION IX - SLIP LINING PIPELINES GENERAL SCOPE MATERIAL CONSTRUCTION REQUIREMENTS EXISTING SERVICES ENTRY AND EXIT PITS PIPE JOINTING... 3 PVC PIPES... 3 POLYETHYLENE PIPES BYPASS PUMPING PIPE LINING CONNECTIONS SERVICE CONNECTIONS CONNECTIONS TO EXISTING NETWORK GROUTING TESTING MEASUREMENT FOR PAYMENT...4 Section IX - Sliplining Pipelines.doc February,

3 SECTION 9 - SLIP LINING PIPELINES GENERAL Slip lining is a technique used to renovate an existing pipeline by inserting a new pipe usually of a smaller diameter, by pushing or pulling it into the existing pipe and grouting the annulus between them SCOPE Specified in this section are requirements of slip lining of existing pipelines generally, including but is not limited to the following: flow diversion and temporary works traffic management excavating entry and exit pits pipe lining fabrication, storage and placement service connections, connecting to access chambers and make water tight Grouting other specific structural works testing reinstatement MATERIAL Suitable pipe lining materials are HDPE, MDPE and UPVC. Contractor may specify other material for consideration by the Superintendent. Use clause 2.04 joints, of general specifications pipe works. Grout to comply with AS3600. Use cement and water at a water cement ratio of 0.5. If blockage with pumps is a problem Contractor may use additives such as Methocell. Obtain prior approval before using any additives CONSTRUCTION REQUIREMENTS Provide all necessary plant, equipment, material and labour for carrying out the slip lining activities EXISTING SERVICES Locate existing service connections using closed circuit television (CCTV) method or using sonde and mark them on site. Carry out the necessary excavation to verify their locations ENTRY AND EXIT PITS The approximate locations of the entry and exit pits are shown on the drawing. Review the pit locations and submit details of the pit dimensions and any change of locations to the Superintendent for approval. Avoid locating these pits closer to buildings if possible. Carry out excavation as specified in Section I, Earthworks. Section IX - Sliplining Pipelines.doc February,

4 PIPE JOINTING PVC PIPES Solvent welded pipe joints are permitted. Ensure pipe pushing or pulling apparatus does not cause shattering or compression of the new pipeline. POLYETHYLENE PIPES Butt fusion weld all pipe joints to Australian Standard AS Remove both the internal and the external beading around the pipe joint caused by the welding BYPASS PUMPING Maintain the flow in the system during lining by bypass pumping or flow diversion. Submit details of bypass pumping or flow diversion to the Superintendent for approval. Stopping of the live flow and storing in the pipeline may be permitted only if there is sufficient storage in the upstream pipeline that will prevent overflows, flooding or blockage of the system. In such cases, provide detail of the length of time proposed for stopping flows. In any case stopping of live flow is permitted for a maximum of 8 continuous hours and thereafter the drainage system must be put back into operation. Give one week notice to the Superintendent, so that the affected public can be notified PIPE LINING Submit details of the pipelining plan to the Superintendent for approval. Include in the details at least the following: Type of mechanical head to be use, Application pressure, Length of pipe to be install per day, Impact of any vibration on adjacent buildings, Storage requirements Environmental issues such as noise, vibration and how they will be minimised, Calibration details of measuring devices, Safety aspects, and Any temporary works proposed Carry out the pipelining operations as approved by the Superintendent and in accordance with the drawings. Stop pipe-cracking operations immediately and take direction from the Superintendent if any of the following occurs: surrounding structures show signs of cracking or vibration pipe lining tool goes off-line incomplete insertion of new pipe flooding of the system due to blockage Arrange for storage of materials and plant with the property owners, if the work is located within the property boundary. Provide adequate traffic management in accordance with Special Conditions of Contract Clause S9.0, if the work is located on roadways. Minimise the impact of disturbances to buildings and property owners. Reinstate the site to its existing conditions and obtain satisfactory written clearance from property owners and the Superintendent ( Use form 596). Section IX - Sliplining Pipelines.doc February,

5 On completion of the pipelining and the installation of the new pipe, inspect all access chambers. Make the connections of the new pipe and the access chambers watertight by using approved sealant. If mortar is used, it should comply with AS3600, Clause Maximum shrinkage allowable is 1% by volume CONNECTIONS SERVICE CONNECTIONS Reconnect all service lines to the new pipeline as identified by the CCTV survey and in accordance with Standard Drawing 7600 series. Property connections or adjoining mains are not to be out of service for more than 8 hours. If this is not possible, temporary connections are to be made at convenient locations, as approved by the Superintendent CONNECTIONS TO EXISTING NETWORK Reconnect all new works to the existing network in accordance with Section Drainage GROUTING Carry out grouting of the annulus between the old and the new pipes using grout specified in Clause Submit to Superintendent details of grouting technique and verification methods to be used for approval prior to commencement of grouting TESTING Provide CCTV equipment and inspect pipeline after all connections have been reconnected. Submit the CCTV surveys to the Superintendent for approval. Field test the pipelines as directed by the Superintendent and in accordance with Section General Specifications, Drainage MEASUREMENT FOR PAYMENT Payment shall be based on the Schedule of Rates as tendered for the contract. The following units of measurement shall be used in the preparation of the Schedule of Rates if lump sum prices are not required. a) Pipe material is measured in linear metres. Include all items in accordance with Section Pipe Works. b) Slip lining is measured in linear metres. Include in the rate the supply of all plant, equipment and labour including all CCTV, temporary works, bypass pumping, jointing and positioning the pipeline in its final alignment and testing. c) Entry pits and exit pits are measured by cubic metres. Include in the rate the cost of excavation, backfilling and support if required. Excavation in rock if encountered shall be measured for payment in cubic metres separately. d) Service and access chambers connections are measured by numbers. Include in the rate locating them above ground, CCTV, any temporary works, all fittings, connecting to pipeline and making water tight using mortar. e) Relaying of service connections is measured in linear metre. Include in the rate the supply of materials, equipment, labour, excavation, backfilling and reinstatement. Section IX - Sliplining Pipelines.doc February,

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