RENOVATION METHOD LINING OF SECTIONAL PIPES MADE OF GRP, PE, PVC AND PP

The method of renovation with the use of liners made of segment pipes consists in inserting short pipe segments inside the old pipeline. Depending on the type of network and pipeline to be renovated, we insert the lining through existing manholes or make assembly excavations.
Renovation segments are made as a representation of the shape of the pipeline being renovated: therefore, they are available as circular and non-circular segments.

ASSESSMENT OF THE TECHNICAL CONDITION OF THE CHANNEL

Prior to renovation, the pipeline is cleaned using the hydrodynamic method – a channel cleaning device mounted on a truck. The pipeline is then inspected with a remotely controlled camera. Analysis of the channel inspection video is the basis for a detailed computer report on the technical condition of the pipeline. Based on the data from the report, a given channel is classified.

SELECTION OF REPAIR METHOD

Depending on the degree of damage or destruction of the sewer and its classification into a given group, the type of sewer renovation technique is selected. After assessing the technical condition of the canal, an analysis of geodetic data, groundwater height in relation to the foundation of the canal, traffic load and other factors affecting the selection of parameters of the lining used should be carried out.

STORAGE AND TRANSPORT TO THE CONSTRUCTION SITE

The lining made of segment pipes is delivered to the storage yard and from there, in appropriate batches, transported to the construction site.

Individual renovation segments are fed into the repaired sewer through the existing manholes (applies to segments up to 0.5 m long and up to DN 600 mm in diameter) or through an assembly trench, with dimensions adapted to their size, using a crane with a load capacity adapted to the weight of the segment.
Then, manually, using a slide or a suitable trolley, it is moved to the assembly site. The connection is made by means of a gasket placed in the cup. It should be performed centrically, along the axis of the pipeline.
Segments of the renovation lining with dimensions smaller than 500 mm can be joined using hand tools and devices. For larger dimensions, use levers, hand winches or presses. Care must be taken to ensure that the segment surfaces in the connection area are protected from damage during connection. Forces must not be applied pointwise to the ends of bare segments.
Before connecting, check the necessary depth of insertion of the spigot end into the socket and mark it around the circumference of the pipe end. Only full insertion of the bare end of the segment into the socket ensures permanent tightness of the connection. The sockets have high values ​​of pressure on the sealing elements, therefore mechanical devices should be used when connecting.
Before making the connection, each segment should be properly prepared by cleaning, drying and degreasing the socket and the bare end on which the gasket is applied. In the case of glued joints, the glue is applied with a suitable tool, e.g. a brush, while its excess can be wiped off with a cloth or a scraper.
The reaction time depends on the type of glue used and the outside temperature. Always follow the adhesive manufacturer’s instructions.

INCLUSION OF THE HOUSEWAY – FOR MANHOLE SEWERS
At the point where the house drain is connected to the lining made of segment pipes, make a hole using a pneumatic hole saw, and then use a pneumatic jigsaw to cut a hole in the light of the house drain. Then, the following should be done:
– a packer with a length of 1000 mm in the lateral drain
– connection of the packer with the segment pipe by means of lamination.
The surfaces to be laminated should be dry, degreased and free of any contamination. Work should be carried out at an air temperature not lower than 10 0C and air humidity lower than 70% (for this purpose, ventilation should be ensured using duct fans).

INJECTION

The injection will be carried out in “n” stages, on sections from well to well. In the lower chamber, the space between the existing sewer and the segment pipe should be sealed; at levels 1/n; 1/n +1/n;… build control tubes, and place a stub for injection at the highest point. At the highest point of sealing the upper chamber, install a vent pipe, allowing free air outflow, and a connector for injection.
The mortar must be injected under pressure that will not exceed the permissible buckling stresses, i.e. crushing of the pipes. This is very important when rehabilitating large diameter pipes with low ring stiffness. When filling the space between the pipes, struts should be used inside the segment lining, which prevents its deformation as a result of injection pressure.

TV INSPECTION

After the installation and opening of the drains, an acceptance TV inspection is performed with recording on DVD or other storage media. At the same time, an inspection report is drawn up.

TESTS

According to PN-EN ISO 11296-1, PN-EN 13566-5 and PN-EN 1610

Defects are removed using a robot under the control of a camera and/or by gluing short pipes.