The special adhesive base is stirred in a clean mixing utensil (bucket) with water. The adhesive base must be a thin pulpy consistency. It is applied with a brush onto the cleaned surface to be rehabilitated.

The rehabilitated stretches can be taken into service approximately 36 hours after the jointing.

In this time all tools and remaining materials must be removed from the stretch. The emergency overflow line must be sealed of at its entry and an aboveground bypass pumping operation must be built up over the whole length of the rehabilitated stretch. The illumination, the electrical lines and the PVC emergency oveflow pipe are removed. The holes for …

Machines and equipment:

• 1 Fork lift truck
• 1 Capstan winch
• 1 Compressor
• 4 Uncoiling trestles
• 2 Ovoid inflatable seals
• 6 Circular inflatable sealing seals DN 150-250
• 2 Mixer units (consisting of "Minitainer", main mixer, control unit and 2 post mixers)
• 2 Extruder welding apparatuses
• 2 Angle grinders (electric, pneumatically driven)
• 1 Drilling machine with various attachments
• 1 Pad saw

Tools:

• Hammer
• Putty knifes
• Rules
• Carpet and hack knives
• Pointed chisels

Site equipment

Site equipment includes traffic safety, provision and preparation of storage surfaces for equipment and material as well as the provision of power and water supplies.

Maintaining the drainage capability

In order to maintain the flow, the sewage is pumped through steel pipes of DN 200 laid on the surface from a point upstream to a point downstream of the sections to be renovated. The pipes are joined together by means of quick couplings.

Starting shaft

Pulling-in a studded liner of this dimension requires the creation of a starting shaft (in this case, the downstream manhole). For the measures described here, the throat of the manhole is removed and replaced by an excavation. The lower part of the manhole remains to a depth of approximately 2.00 m. Access is by ladders.

Important: Depending on the properties of the soil (un-stable soil) and the depth of the excavation (> 1.25 m) it …

Preparatory measures

An diesel capstan winch is positioned at the target manhole for pulling-in the protective foil, the Preliner and the stud hose.

Pulling-in the Preliner

The Preliner hose is folded at the front to form a pulling head and this is connected to the winch cable.

Pulling-in the stud hose

The front of the stud hose is folded to form a pulling head and this is connected to the winch cable.

Preparing measures

First nozzles are installed in the Preliner at both ends of the section to be renovated for filling and venting during the grouting process. For this purpose, the openings are marked, cut out and roughened for welding with an angle grinder. Welding is carried out with an extrusion welder.

Testing during grouting

In order to take samples and for regular control of the TROLINING^® injector grout and for protocolling the injector grouting process, sample bottles are labelled and measured.

The following are also required to make a record of the injector grouting process:

• Scale,
• Timing funnel,
• Stopwatch,
• Thermometer,
• Pocket calculator and
• Report form.

Grouting

First the first mixing unit is put into operation and the addition of water is regulated (ca. 3.6 t cement to 1.5 m³ water) until the injector grout comes out of the hose in a watery consistency. When the consistency is correct, a sample is taken and viscosity, density as well as temperature are determined. If the material does not satisfy the conditions, then the process is repeated. The testing of the second mixing unit is carried out …

Recreating of the branch connections

Because of the size of the sewer, the reconnection of the laterals is carried out from the inside.

The positions of laterals were measured in the preliminary work, so that the positions in the renovated sewer can be drawn by a marker. A hole is made in the liner at the marked position with a hammer and pointed chisel in order to check whether the lateral is indeed at the indicated position. The approximate position …

Manhole connection

The liner is first cut back, e.g. the part of the liner projecting into the manhole is cut back flush with the manhole wall using an angle grinder (here driven by compressed air). Because of the large amount of dust, a respirator and protective goggles must be worn. The injector grout directly at the cutting edge is removed so that the stud hose and the Preliner can be better welded together.

The replacement of the manhole on this site was carried out by the Hans Brochier GmbH & Co, Nuremberg. For this purpose, an even base was bricked up on the lower part of the shaft. The replacement of the manhole was carried out with prefabricated concrete elements. Finally the road surface was replaced.