MANHOLE RENOVATION WITH DURA.Port

If an old sewer is in need of renovation, the manholes and other structures that are also part of the system often need to be renewed, too. Renovating these elements is becoming an increasingly important task for operators. The range of stresses on manholes and related structures – for example, due to aggressive wastewater, groundwater, soil pressure or traffic – have increased steadily in recent years. Materials once considered reliable and durable can no longer withstand today's stresses. The consequences, not infrequently, are massive damage to their basic substance. The most notable stressors are: 

• Hydrogen sulfide corrosion
• Defective step irons
• Leaks at connections and in the manhole wall
• Cracks and holes
• Defective berms and channels

Manholes that show such damage can no longer fulfill their function properly and have to be renovated. The DURA.PC system presents a suitable, durable solution for channels, berms and manhole walls for all common manholes. Inlets are professionally integrated into the manhole at any point using standard renovation techniques, and complex channel shapes are fitted directly on site. 

Because all components can be inserted through a standard DN 600 opening, disruptive and expensive earthworks and roadwork are eliminated; required dewatering can also be kept to a minimum. The frictional connection binding the renovation components to the old manhole also increases its static load-bearing capacity.

For renovating circular manholes, we employ a method already used successfully in tunnel construction for many years. In the segmental construction method, the rising manhole rings are lined with three-part elements. The thin walls allowed by the material are particularly beneficial, allowing a maximum of free space to be retained. (e.g. a DN 1000 manhole has an inner width of 900 after renovation). Precision-designed elements are also available for other areas of the manhole.