Process: Lining with spirally-wound pipes

Title: Renovation of a DN 1200 concrete sewer using Lining with spirally-wound

Place: Garden area

Boundary conditions:

• System: combined sewer
• Material: concrete
• Cross-section shape: circular cross-section
• Nominal width: DN 1200
• Depth: 4.2 m (14 ft)
• Groundwater: fluctuating groundwater level, not relevant during rehabilitation
• Gradient: approx. 1 ‰
• Rehabilitation length

Use of machines and equipment:

When using the Lining with spirally-wound pipes, the following machines and equipment are primarily used:

• Truck with workshop space
• Delivery van for transporting the coiling machine and the material
• Winding machine
• Hydraulic drive for the coiling machine in the truck
• Power generator in the truck
• Wheel loader with forklift and boom attachment
• Grout mixing unit

Site set-up

The site set-up includes traffic safety, the definition of parking and storage areas for equipment and material as well as the installation of the power and water supply.

Due to the location of the starting manhole within the access road to a garden and the existing cramped conditions on the construction site, frequent manoeuvring and repositioning of vehicles and equipment was necessary.

The target manhole is located in the middle of a …

Condition of the sewer before cleaning

The hydraulically operated winding machine used in this case is suitable for lining pipelines with diameters from DN 600 to DN 1200. Depending on the diameter to be wound, only different winding cages are used.

First, the winding machine, which is disassembled into individual parts, is transported from the delivery truck to the starting manhole by means of a wheel loader with forklift attachment. It consists of a machine drive and a winding cage. …

To ensure that the beginning of the spirally-wound pipe is later at right angles to the pipe axis, the beginning of the T-Rib profile is sharpened (pointed) over a circumferential length (approx. 3 m (10 ft)) using an angle grinder. For this purpose, the T-Rib profile, which is delivered on a drum and secured for transport is unrolled.

The sharpened (pointed) T-Rib profile is pulled through a guide roller attached to the boom of the wheel loader and inserted into the manhole.

The annular space between the old pipe and the spirally-wound pipe is closed off by filling it with sulphate-resistant cement mortar up to 20 – 30 cm (8 – 12 in) from the manhole wall into the annular space.

First, the annular space is sealed at the high point (here: target manhole). After closing the annular space and installing a ventilation nozzle at the crown (apex), the receiving wastewater is briefly interrupted (water flow control) so that …

The annular space is grouted in two sections starting from the low point. For this purpose, the mixing unit is positioned near the starting manhole and the filling hose is connected.

With one mixing process, approx. 0.55 m³ (145 liq.gal.) of grout (Blitzdämmer®) can be produced with the mixing unit used here. The grout is mixed according to the manufacturer's instructions.

For this purpose, the mixing container of the mixing unit is first filled approx. …

Lining of a DN 1200 concrete sewer with a profiled plastic profile with lock, which is wound in a spiral using a stationary winding machine, and forms a continuous pipe string after installation (SWP winding pipe method).