Sewer rehabilitation

Sewage systems must be in a functional condition and therefore regularly inspected. If there are cracks or leaks in the sewer pipes, they must be repaired as quickly as possible. A renovation ensures the value retention and functional safety of sewer systems. Find out here why sewer renovation is important and which methods Nehlsen works with.

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[Translate to English:] Mitarbeiter und Equipment von Nehlsen bei Sanierung

Your benefits at a glance:

Do you have questions about sewer rehabilitation? We'll be happy to answer them! Contact us today and we'll support your plans with a detailed and customized consultation. Use the request form or find a Nehlsen location with sewer services in your area!

Competent damage classification
Development of a sewer renovation concept as well as quantity and cost determination
Various methods: sewer renovation with short liners, inliners, long packers and milling robots
Sleeve liner, pipe liner, shaft renovation

Why rehabilitate a sewer?

Cracks and damage in pipes, shafts and sewers that become visible during pipe cleaning or inspection can lead to the contamination of groundwater and soil and thus pose a risk to the environment and to humans. Damage to the sewage pipes also poses a high risk in terms of construction, as it can, for example, lead to settlement cracks or corrosion in the masonry of buildings. Damage to the pipes also has a negative impact on maintaining their value.

To prevent sewage from flowing out of the pipes into the ground and into the ecosystem, damage to pipes and sewers must be repaired. If damage is not repaired, it can lead to even greater damage at a later date and result in high costs. If damage is detected early, repairs can be started in time, keeping costs low and preventing more serious events from occurring later on.

For insurance reasons, it is also advisable to have sewers inspected regularly and repaired if necessary.

The process of
sewer rehabilitation

Before the sewer can be repaired, it must first be cleaned so that deposits and dirt do not distort the subsequent inspection. During the sewer inspection, the sewer system is examined in detail. A camera with high-quality technology is used to travel through the sewers to detect damage and leaks in the pipes. Sewer repair can only begin after these steps have been completed.

Depending on the damage and external circumstances, open-trench sewer repair may be unavoidable. This involves digging an excavation pit so that the specialist company can repair or, if necessary, replace the pipe entirely. This method is usually more expensive than the trenchless method, since the surface must be restored afterwards and there may be disruptions to traffic.

A more cost-effective alternative is trenchless sewer rehabilitation. Here, a distinction is made between the short liner and the long liner method. Before either trenchless method is used, the pipe is cleaned and inspected.

Individual defects such as root ingrowth or punctual cracks are repaired using the short liner method. When renovating with inliners, a transport bladder is used, which is positioned at the point of damage. On the bladder there is a laminate with a glass fiber mat soaked in multi-component resin. The transport bladder is inflated at the right place so that the multi-component resin can dry at the crack. After hardening, the hose is removed again.

The long-liner method is used to rehabilitate complete pipe systems – also known as pipe lining. This is not about spot repairs, but about rehabilitating entire sections of pipe. Connecting pipes are opened afterwards and, if necessary, integrated accordingly. A milling robot is often used to prepare for rehabilitation work, for example to easily remove root ingrowth and other obstacles.

[Translate to English:] Geoeffneter Kanalschacht

Sewer system maintenance and climate protection

Many sewer systems are outdated and therefore need maintenance or repairs. Currently, climate change is causing high precipitation intensities, which often overload the sewer system. As a result, streets are flooded. For this reason, it is important to regularly clean and inspect the sewer system. Repairs and renovations are often the result of these inspections.