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LAYING AND CONNECTING KRUŠIK SPIRAL PIPES                  serbian

polaganje-cevi   Instructions DIN 18300 and DIN 4033Z apply for laying KRUŠIK-SPIRAL sewage pipes. Pipeline is placed on the prepared subgrade of sand, 20 cm thick. Around the pipeline, simultaneously on both sides, filling and compression of sand or some other material is done (ground stone from separation), with grain up to 3 mm big.  polaganje-ceviCompressing materials in 20 cm layers is done up to the height of 3/4 of the outer diameter of the plastic sewage pipe. 
Laying of plastic pipe
In order to protect it from mechanical damages, plastic pipes are backfilled 20 cm above the vertex, with material which may not contain large stones, broken bricks, concrete etc. That part may be filled in with excavation material in case that it does not contain material which could potentially damage the pipes. The remaining part of the canal is backfilled with excavation material. Compressing material around the pipes may be done manually or with machines. Tests have shown that compressing material of the pipes with adequate vibration device is much better than manual compression. Compressing material around the pipes should achieve such compactness so as to obtain vertical deformity of 3%. Experience so far has shown that with irregular laying of pipelines there are deformities greater than allowed. When laying pipes in unstable terrain (sludge, difficult conditions during laying due to rockslides etc.) a static calculation should be done without compression on the sides of pipes, with the smallest percentage of compression. 
Connecting of plastic pipe

Connecting of Krušik-spiral plastic pipes is done in two ways: extrusion welding and rubber gaskets.

     EXTRUSION WELDING  
ekstruziono-zavarivanje
Extrusion welding as per DVS 2209 on the pipe with a diameter from 300 to 3000mm

    The best sealing of connections of KRUŠIK-SPIRAL pipes is achieved by homogenous welding. Welding is performed by welding extruders which ejects electrode-mass in pasty condition in the material which the pipe was made of. Heated mass in pasty condition at a temperature of about 220˚C, and with certain cross-section is placed and pressed to a previously processed, cleaned and deheated fillet. Deheating of the fillet at a temperature of about 220˚C is done with warm air. 

 The quality of the weld affected by the following factors:
    •    skills of the workers  
    •    deheating of electrode and fillet
    •    purity of fillet and welding  

    

    Pipes up to 700 mm in diameter are welded on the outer side. Pipes above 700 mm may be welded on the inner side. Smaller diameter pipes may be welded at the edge of the trench and welded pieces are then placed in the trench. If the conditions on the construction site allow (no underground waters), welding pipes with diameters from 800 to 3000 mm may be done independently from laying and trench backfilling works. In case where connecting pipes is performed with concrete manholes, endings of pipes i.e. pipe extensions have a conical connection with a flexible tape wrap.

RUBBER GASKETS

   Rubber gaskets (rubber rings) are given as alternative solution for connecting pipes. This method enables connection of the pipes with diameters from 300 to 1200 mm. Connecting with rubber gaskets is a quicker and more cost efficient way of connecting and its special advantage is in unfavourable laying conditions (high level of undergound water) and when it is difficult to ensure welding conditions. 

spajanje-gumenim-dihtunzima
Rubber gasket is placed in a groove at female
socket at a pipe with 300 to 600 mm diameter
Rubber gasket is fitted in a female socket at
a pipe with 700 to 1200 mm diameter

 

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