TECHNICAL DESCRIPTION OF A REHABILITATION OF HOUSE DRAINS USING „TOP HAT”

1. METHOD DESCRIPTION
DrainLCR – Liner (Lateral Connection Repair) system is designed for rehabilitation and permanent sealing of brims and laterals of the main pipeline leading to house drains of diameter up to 300 mm. It uses either LCR top hat or LCR sleeve liners. LCR top hat liner seals the connection in the main pipeline on the brim only, while LCR sleeve is installed similarly to short sleeve.

2. LINER INSTALLATION EQUIPMENT

  • sewer cleaning equipment (pressure truck);
  • sewer inspection camera;
  • compressor;
  • power generator;
  • LCR unit;
  • by-passing unit (pumps, hoses).

3. PREPARATION TO INSTALLATION
The unit can rehabilitate brims of lateral connections between the main sewer and house drains using so-called short sleeve and, simultaneously, rehabilitate a defined section of the house drain. It also can install an LCR top hat liner. It uses a pre-shaped, flexible tube that functions as a shaping element. The main pipe (packer tube), cylindrical on the side, has an additional lateral tube (bulb tube), positioned centrally at 45° or 90°.
Before installation, the bulb tube is inserted into packer tube with the LCR sleeve or LCR top hat (they have the same shape as the shaping element). Then air is vacuumed from the packer and bulb tubes. It prevents the rehabilitation material (LCR sleeve or LCR top hat) from slipping.
The assembly is moved to the rehabilitation place using a fiber optic rod; the operation is facilitated with 2 telescopic wheel assemblies. The assembly can be rotated axially in the rehabilitation spot using the wheeled assemblies and a rotation drive. A camera mounted on the assembly is used for its final positioning.
Then a control panel is used for operating the expansion mechanism (Pathfinder). It expands the basket and presses the integrated brim against the pipe wall. Now the packer is withdrawn using the fiber optic rod and the brim is inserted into the lateral connection. If the lateral connection opening is not found, the assembly can be moved, so as the expansion basket fits the lateral opening.
After the positioning the packer tube is inflated, the bulb tube is introduced to the lateral connection and the basket is withdrawn. Insertion is delayed using a HD line released and braked by a winch. Completion of the lateral connection introduction is confirmed with a sound signal. After curing the sleeve, air is vacuumed from the assembly and the assembly can be moved from the rehabilitation place.